Commit | Line | Data |
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91d76f53 DG |
1 | /* |
2 | * Copyright (C) 2011 - David Goulet <david.goulet@polymtl.ca> | |
bdf64013 | 3 | * Copyright (C) 2016 - Jérémie Galarneau <jeremie.galarneau@efficios.com> |
91d76f53 | 4 | * |
d14d33bf AM |
5 | * This program is free software; you can redistribute it and/or modify |
6 | * it under the terms of the GNU General Public License, version 2 only, | |
7 | * as published by the Free Software Foundation. | |
91d76f53 DG |
8 | * |
9 | * This program is distributed in the hope that it will be useful, | |
10 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
12 | * GNU General Public License for more details. | |
13 | * | |
d14d33bf AM |
14 | * You should have received a copy of the GNU General Public License along |
15 | * with this program; if not, write to the Free Software Foundation, Inc., | |
16 | * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. | |
91d76f53 DG |
17 | */ |
18 | ||
6c1c0768 | 19 | #define _LGPL_SOURCE |
91d76f53 | 20 | #include <errno.h> |
7972aab2 | 21 | #include <inttypes.h> |
91d76f53 DG |
22 | #include <pthread.h> |
23 | #include <stdio.h> | |
24 | #include <stdlib.h> | |
099e26bd | 25 | #include <string.h> |
aba8e916 DG |
26 | #include <sys/stat.h> |
27 | #include <sys/types.h> | |
099e26bd | 28 | #include <unistd.h> |
0df502fd | 29 | #include <urcu/compiler.h> |
fb54cdbf | 30 | #include <lttng/ust-error.h> |
331744e3 | 31 | #include <signal.h> |
bec39940 | 32 | |
990570ed | 33 | #include <common/common.h> |
86acf0da | 34 | #include <common/sessiond-comm/sessiond-comm.h> |
1e307fab | 35 | |
7972aab2 | 36 | #include "buffer-registry.h" |
86acf0da | 37 | #include "fd-limit.h" |
8782cc74 | 38 | #include "health-sessiond.h" |
56fff090 | 39 | #include "ust-app.h" |
48842b30 | 40 | #include "ust-consumer.h" |
d80a6244 | 41 | #include "ust-ctl.h" |
0b2dc8df | 42 | #include "utils.h" |
fb83fe64 | 43 | #include "session.h" |
d80a6244 | 44 | |
c4b88406 MD |
45 | static |
46 | int ust_app_flush_app_session(struct ust_app *app, struct ust_app_session *ua_sess); | |
47 | ||
d9bf3ca4 MD |
48 | /* Next available channel key. Access under next_channel_key_lock. */ |
49 | static uint64_t _next_channel_key; | |
50 | static pthread_mutex_t next_channel_key_lock = PTHREAD_MUTEX_INITIALIZER; | |
51 | ||
52 | /* Next available session ID. Access under next_session_id_lock. */ | |
53 | static uint64_t _next_session_id; | |
54 | static pthread_mutex_t next_session_id_lock = PTHREAD_MUTEX_INITIALIZER; | |
ffe60014 DG |
55 | |
56 | /* | |
d9bf3ca4 | 57 | * Return the incremented value of next_channel_key. |
ffe60014 | 58 | */ |
d9bf3ca4 | 59 | static uint64_t get_next_channel_key(void) |
ffe60014 | 60 | { |
d9bf3ca4 MD |
61 | uint64_t ret; |
62 | ||
63 | pthread_mutex_lock(&next_channel_key_lock); | |
64 | ret = ++_next_channel_key; | |
65 | pthread_mutex_unlock(&next_channel_key_lock); | |
66 | return ret; | |
ffe60014 DG |
67 | } |
68 | ||
69 | /* | |
7972aab2 | 70 | * Return the atomically incremented value of next_session_id. |
ffe60014 | 71 | */ |
d9bf3ca4 | 72 | static uint64_t get_next_session_id(void) |
ffe60014 | 73 | { |
d9bf3ca4 MD |
74 | uint64_t ret; |
75 | ||
76 | pthread_mutex_lock(&next_session_id_lock); | |
77 | ret = ++_next_session_id; | |
78 | pthread_mutex_unlock(&next_session_id_lock); | |
79 | return ret; | |
ffe60014 DG |
80 | } |
81 | ||
d65d2de8 DG |
82 | static void copy_channel_attr_to_ustctl( |
83 | struct ustctl_consumer_channel_attr *attr, | |
84 | struct lttng_ust_channel_attr *uattr) | |
85 | { | |
86 | /* Copy event attributes since the layout is different. */ | |
87 | attr->subbuf_size = uattr->subbuf_size; | |
88 | attr->num_subbuf = uattr->num_subbuf; | |
89 | attr->overwrite = uattr->overwrite; | |
90 | attr->switch_timer_interval = uattr->switch_timer_interval; | |
91 | attr->read_timer_interval = uattr->read_timer_interval; | |
92 | attr->output = uattr->output; | |
93 | } | |
94 | ||
025faf73 DG |
95 | /* |
96 | * Match function for the hash table lookup. | |
97 | * | |
98 | * It matches an ust app event based on three attributes which are the event | |
99 | * name, the filter bytecode and the loglevel. | |
100 | */ | |
18eace3b DG |
101 | static int ht_match_ust_app_event(struct cds_lfht_node *node, const void *_key) |
102 | { | |
103 | struct ust_app_event *event; | |
104 | const struct ust_app_ht_key *key; | |
2106efa0 | 105 | int ev_loglevel_value; |
18eace3b DG |
106 | |
107 | assert(node); | |
108 | assert(_key); | |
109 | ||
110 | event = caa_container_of(node, struct ust_app_event, node.node); | |
111 | key = _key; | |
2106efa0 | 112 | ev_loglevel_value = event->attr.loglevel; |
18eace3b | 113 | |
1af53eb5 | 114 | /* Match the 4 elements of the key: name, filter, loglevel, exclusions */ |
18eace3b DG |
115 | |
116 | /* Event name */ | |
117 | if (strncmp(event->attr.name, key->name, sizeof(event->attr.name)) != 0) { | |
118 | goto no_match; | |
119 | } | |
120 | ||
121 | /* Event loglevel. */ | |
2106efa0 | 122 | if (ev_loglevel_value != key->loglevel_type) { |
025faf73 | 123 | if (event->attr.loglevel_type == LTTNG_UST_LOGLEVEL_ALL |
2106efa0 PP |
124 | && key->loglevel_type == 0 && |
125 | ev_loglevel_value == -1) { | |
025faf73 DG |
126 | /* |
127 | * Match is accepted. This is because on event creation, the | |
128 | * loglevel is set to -1 if the event loglevel type is ALL so 0 and | |
129 | * -1 are accepted for this loglevel type since 0 is the one set by | |
130 | * the API when receiving an enable event. | |
131 | */ | |
132 | } else { | |
133 | goto no_match; | |
134 | } | |
18eace3b DG |
135 | } |
136 | ||
137 | /* One of the filters is NULL, fail. */ | |
138 | if ((key->filter && !event->filter) || (!key->filter && event->filter)) { | |
139 | goto no_match; | |
140 | } | |
141 | ||
025faf73 DG |
142 | if (key->filter && event->filter) { |
143 | /* Both filters exists, check length followed by the bytecode. */ | |
144 | if (event->filter->len != key->filter->len || | |
145 | memcmp(event->filter->data, key->filter->data, | |
146 | event->filter->len) != 0) { | |
147 | goto no_match; | |
148 | } | |
18eace3b DG |
149 | } |
150 | ||
1af53eb5 JI |
151 | /* One of the exclusions is NULL, fail. */ |
152 | if ((key->exclusion && !event->exclusion) || (!key->exclusion && event->exclusion)) { | |
153 | goto no_match; | |
154 | } | |
155 | ||
156 | if (key->exclusion && event->exclusion) { | |
157 | /* Both exclusions exists, check count followed by the names. */ | |
158 | if (event->exclusion->count != key->exclusion->count || | |
159 | memcmp(event->exclusion->names, key->exclusion->names, | |
160 | event->exclusion->count * LTTNG_UST_SYM_NAME_LEN) != 0) { | |
161 | goto no_match; | |
162 | } | |
163 | } | |
164 | ||
165 | ||
025faf73 | 166 | /* Match. */ |
18eace3b DG |
167 | return 1; |
168 | ||
169 | no_match: | |
170 | return 0; | |
18eace3b DG |
171 | } |
172 | ||
025faf73 DG |
173 | /* |
174 | * Unique add of an ust app event in the given ht. This uses the custom | |
175 | * ht_match_ust_app_event match function and the event name as hash. | |
176 | */ | |
d0b96690 | 177 | static void add_unique_ust_app_event(struct ust_app_channel *ua_chan, |
18eace3b DG |
178 | struct ust_app_event *event) |
179 | { | |
180 | struct cds_lfht_node *node_ptr; | |
181 | struct ust_app_ht_key key; | |
d0b96690 | 182 | struct lttng_ht *ht; |
18eace3b | 183 | |
d0b96690 DG |
184 | assert(ua_chan); |
185 | assert(ua_chan->events); | |
18eace3b DG |
186 | assert(event); |
187 | ||
d0b96690 | 188 | ht = ua_chan->events; |
18eace3b DG |
189 | key.name = event->attr.name; |
190 | key.filter = event->filter; | |
2106efa0 | 191 | key.loglevel_type = event->attr.loglevel; |
91c89f23 | 192 | key.exclusion = event->exclusion; |
18eace3b DG |
193 | |
194 | node_ptr = cds_lfht_add_unique(ht->ht, | |
195 | ht->hash_fct(event->node.key, lttng_ht_seed), | |
196 | ht_match_ust_app_event, &key, &event->node.node); | |
197 | assert(node_ptr == &event->node.node); | |
198 | } | |
199 | ||
d88aee68 DG |
200 | /* |
201 | * Close the notify socket from the given RCU head object. This MUST be called | |
202 | * through a call_rcu(). | |
203 | */ | |
204 | static void close_notify_sock_rcu(struct rcu_head *head) | |
205 | { | |
206 | int ret; | |
207 | struct ust_app_notify_sock_obj *obj = | |
208 | caa_container_of(head, struct ust_app_notify_sock_obj, head); | |
209 | ||
210 | /* Must have a valid fd here. */ | |
211 | assert(obj->fd >= 0); | |
212 | ||
213 | ret = close(obj->fd); | |
214 | if (ret) { | |
215 | ERR("close notify sock %d RCU", obj->fd); | |
216 | } | |
217 | lttng_fd_put(LTTNG_FD_APPS, 1); | |
218 | ||
219 | free(obj); | |
220 | } | |
221 | ||
7972aab2 DG |
222 | /* |
223 | * Return the session registry according to the buffer type of the given | |
224 | * session. | |
225 | * | |
226 | * A registry per UID object MUST exists before calling this function or else | |
227 | * it assert() if not found. RCU read side lock must be acquired. | |
228 | */ | |
229 | static struct ust_registry_session *get_session_registry( | |
230 | struct ust_app_session *ua_sess) | |
231 | { | |
232 | struct ust_registry_session *registry = NULL; | |
233 | ||
234 | assert(ua_sess); | |
235 | ||
236 | switch (ua_sess->buffer_type) { | |
237 | case LTTNG_BUFFER_PER_PID: | |
238 | { | |
239 | struct buffer_reg_pid *reg_pid = buffer_reg_pid_find(ua_sess->id); | |
240 | if (!reg_pid) { | |
241 | goto error; | |
242 | } | |
243 | registry = reg_pid->registry->reg.ust; | |
244 | break; | |
245 | } | |
246 | case LTTNG_BUFFER_PER_UID: | |
247 | { | |
248 | struct buffer_reg_uid *reg_uid = buffer_reg_uid_find( | |
249 | ua_sess->tracing_id, ua_sess->bits_per_long, ua_sess->uid); | |
250 | if (!reg_uid) { | |
251 | goto error; | |
252 | } | |
253 | registry = reg_uid->registry->reg.ust; | |
254 | break; | |
255 | } | |
256 | default: | |
257 | assert(0); | |
258 | }; | |
259 | ||
260 | error: | |
261 | return registry; | |
262 | } | |
263 | ||
55cc08a6 DG |
264 | /* |
265 | * Delete ust context safely. RCU read lock must be held before calling | |
266 | * this function. | |
267 | */ | |
268 | static | |
fb45065e MD |
269 | void delete_ust_app_ctx(int sock, struct ust_app_ctx *ua_ctx, |
270 | struct ust_app *app) | |
55cc08a6 | 271 | { |
ffe60014 DG |
272 | int ret; |
273 | ||
274 | assert(ua_ctx); | |
275 | ||
55cc08a6 | 276 | if (ua_ctx->obj) { |
fb45065e | 277 | pthread_mutex_lock(&app->sock_lock); |
ffe60014 | 278 | ret = ustctl_release_object(sock, ua_ctx->obj); |
fb45065e | 279 | pthread_mutex_unlock(&app->sock_lock); |
d0b96690 DG |
280 | if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
281 | ERR("UST app sock %d release ctx obj handle %d failed with ret %d", | |
282 | sock, ua_ctx->obj->handle, ret); | |
ffe60014 | 283 | } |
55cc08a6 DG |
284 | free(ua_ctx->obj); |
285 | } | |
286 | free(ua_ctx); | |
287 | } | |
288 | ||
d80a6244 DG |
289 | /* |
290 | * Delete ust app event safely. RCU read lock must be held before calling | |
291 | * this function. | |
292 | */ | |
8b366481 | 293 | static |
fb45065e MD |
294 | void delete_ust_app_event(int sock, struct ust_app_event *ua_event, |
295 | struct ust_app *app) | |
d80a6244 | 296 | { |
ffe60014 DG |
297 | int ret; |
298 | ||
299 | assert(ua_event); | |
300 | ||
53a80697 | 301 | free(ua_event->filter); |
951f0b71 JI |
302 | if (ua_event->exclusion != NULL) |
303 | free(ua_event->exclusion); | |
edb67388 | 304 | if (ua_event->obj != NULL) { |
fb45065e | 305 | pthread_mutex_lock(&app->sock_lock); |
ffe60014 | 306 | ret = ustctl_release_object(sock, ua_event->obj); |
fb45065e | 307 | pthread_mutex_unlock(&app->sock_lock); |
ffe60014 DG |
308 | if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
309 | ERR("UST app sock %d release event obj failed with ret %d", | |
310 | sock, ret); | |
311 | } | |
edb67388 DG |
312 | free(ua_event->obj); |
313 | } | |
d80a6244 DG |
314 | free(ua_event); |
315 | } | |
316 | ||
317 | /* | |
7972aab2 DG |
318 | * Release ust data object of the given stream. |
319 | * | |
320 | * Return 0 on success or else a negative value. | |
d80a6244 | 321 | */ |
fb45065e MD |
322 | static int release_ust_app_stream(int sock, struct ust_app_stream *stream, |
323 | struct ust_app *app) | |
d80a6244 | 324 | { |
7972aab2 | 325 | int ret = 0; |
ffe60014 DG |
326 | |
327 | assert(stream); | |
328 | ||
8b366481 | 329 | if (stream->obj) { |
fb45065e | 330 | pthread_mutex_lock(&app->sock_lock); |
ffe60014 | 331 | ret = ustctl_release_object(sock, stream->obj); |
fb45065e | 332 | pthread_mutex_unlock(&app->sock_lock); |
ffe60014 DG |
333 | if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
334 | ERR("UST app sock %d release stream obj failed with ret %d", | |
335 | sock, ret); | |
336 | } | |
4063050c | 337 | lttng_fd_put(LTTNG_FD_APPS, 2); |
8b366481 DG |
338 | free(stream->obj); |
339 | } | |
7972aab2 DG |
340 | |
341 | return ret; | |
342 | } | |
343 | ||
344 | /* | |
345 | * Delete ust app stream safely. RCU read lock must be held before calling | |
346 | * this function. | |
347 | */ | |
348 | static | |
fb45065e MD |
349 | void delete_ust_app_stream(int sock, struct ust_app_stream *stream, |
350 | struct ust_app *app) | |
7972aab2 DG |
351 | { |
352 | assert(stream); | |
353 | ||
fb45065e | 354 | (void) release_ust_app_stream(sock, stream, app); |
84cd17c6 | 355 | free(stream); |
d80a6244 DG |
356 | } |
357 | ||
36b588ed MD |
358 | /* |
359 | * We need to execute ht_destroy outside of RCU read-side critical | |
0b2dc8df MD |
360 | * section and outside of call_rcu thread, so we postpone its execution |
361 | * using ht_cleanup_push. It is simpler than to change the semantic of | |
362 | * the many callers of delete_ust_app_session(). | |
36b588ed MD |
363 | */ |
364 | static | |
365 | void delete_ust_app_channel_rcu(struct rcu_head *head) | |
366 | { | |
367 | struct ust_app_channel *ua_chan = | |
368 | caa_container_of(head, struct ust_app_channel, rcu_head); | |
369 | ||
0b2dc8df MD |
370 | ht_cleanup_push(ua_chan->ctx); |
371 | ht_cleanup_push(ua_chan->events); | |
36b588ed MD |
372 | free(ua_chan); |
373 | } | |
374 | ||
fb83fe64 JD |
375 | /* |
376 | * Extract the lost packet or discarded events counter when the channel is | |
377 | * being deleted and store the value in the parent channel so we can | |
378 | * access it from lttng list and at stop/destroy. | |
379 | */ | |
380 | static | |
381 | void save_per_pid_lost_discarded_counters(struct ust_app_channel *ua_chan) | |
382 | { | |
383 | uint64_t discarded = 0, lost = 0; | |
384 | struct ltt_session *session; | |
385 | struct ltt_ust_channel *uchan; | |
386 | ||
387 | if (ua_chan->attr.type != LTTNG_UST_CHAN_PER_CPU) { | |
388 | return; | |
389 | } | |
390 | ||
391 | rcu_read_lock(); | |
392 | session = session_find_by_id(ua_chan->session->tracing_id); | |
393 | if (!session) { | |
394 | ERR("Missing LTT session to get discarded events"); | |
395 | goto end; | |
396 | } | |
397 | if (!session->ust_session) { | |
398 | ERR("Missing UST session to get discarded events"); | |
399 | goto end; | |
400 | } | |
401 | ||
402 | if (ua_chan->attr.overwrite) { | |
403 | consumer_get_lost_packets(ua_chan->session->tracing_id, | |
404 | ua_chan->key, session->ust_session->consumer, | |
405 | &lost); | |
406 | } else { | |
407 | consumer_get_discarded_events(ua_chan->session->tracing_id, | |
408 | ua_chan->key, session->ust_session->consumer, | |
409 | &discarded); | |
410 | } | |
411 | uchan = trace_ust_find_channel_by_name( | |
412 | session->ust_session->domain_global.channels, | |
413 | ua_chan->name); | |
414 | if (!uchan) { | |
415 | ERR("Missing UST channel to store discarded counters"); | |
416 | goto end; | |
417 | } | |
418 | ||
419 | uchan->per_pid_closed_app_discarded += discarded; | |
420 | uchan->per_pid_closed_app_lost += lost; | |
421 | ||
422 | end: | |
423 | rcu_read_unlock(); | |
424 | } | |
425 | ||
d80a6244 DG |
426 | /* |
427 | * Delete ust app channel safely. RCU read lock must be held before calling | |
428 | * this function. | |
429 | */ | |
8b366481 | 430 | static |
d0b96690 DG |
431 | void delete_ust_app_channel(int sock, struct ust_app_channel *ua_chan, |
432 | struct ust_app *app) | |
d80a6244 DG |
433 | { |
434 | int ret; | |
bec39940 | 435 | struct lttng_ht_iter iter; |
d80a6244 | 436 | struct ust_app_event *ua_event; |
55cc08a6 | 437 | struct ust_app_ctx *ua_ctx; |
030a66fa | 438 | struct ust_app_stream *stream, *stmp; |
7972aab2 | 439 | struct ust_registry_session *registry; |
d80a6244 | 440 | |
ffe60014 DG |
441 | assert(ua_chan); |
442 | ||
443 | DBG3("UST app deleting channel %s", ua_chan->name); | |
444 | ||
55cc08a6 | 445 | /* Wipe stream */ |
d80a6244 | 446 | cds_list_for_each_entry_safe(stream, stmp, &ua_chan->streams.head, list) { |
84cd17c6 | 447 | cds_list_del(&stream->list); |
fb45065e | 448 | delete_ust_app_stream(sock, stream, app); |
d80a6244 DG |
449 | } |
450 | ||
55cc08a6 | 451 | /* Wipe context */ |
bec39940 | 452 | cds_lfht_for_each_entry(ua_chan->ctx->ht, &iter.iter, ua_ctx, node.node) { |
31746f93 | 453 | cds_list_del(&ua_ctx->list); |
bec39940 | 454 | ret = lttng_ht_del(ua_chan->ctx, &iter); |
55cc08a6 | 455 | assert(!ret); |
fb45065e | 456 | delete_ust_app_ctx(sock, ua_ctx, app); |
55cc08a6 | 457 | } |
d80a6244 | 458 | |
55cc08a6 | 459 | /* Wipe events */ |
bec39940 DG |
460 | cds_lfht_for_each_entry(ua_chan->events->ht, &iter.iter, ua_event, |
461 | node.node) { | |
462 | ret = lttng_ht_del(ua_chan->events, &iter); | |
525b0740 | 463 | assert(!ret); |
fb45065e | 464 | delete_ust_app_event(sock, ua_event, app); |
d80a6244 | 465 | } |
edb67388 | 466 | |
c8335706 MD |
467 | if (ua_chan->session->buffer_type == LTTNG_BUFFER_PER_PID) { |
468 | /* Wipe and free registry from session registry. */ | |
469 | registry = get_session_registry(ua_chan->session); | |
470 | if (registry) { | |
471 | ust_registry_channel_del_free(registry, ua_chan->key); | |
472 | } | |
fb83fe64 | 473 | save_per_pid_lost_discarded_counters(ua_chan); |
7972aab2 | 474 | } |
d0b96690 | 475 | |
edb67388 | 476 | if (ua_chan->obj != NULL) { |
d0b96690 DG |
477 | /* Remove channel from application UST object descriptor. */ |
478 | iter.iter.node = &ua_chan->ust_objd_node.node; | |
c6e62271 DG |
479 | ret = lttng_ht_del(app->ust_objd, &iter); |
480 | assert(!ret); | |
fb45065e | 481 | pthread_mutex_lock(&app->sock_lock); |
ffe60014 | 482 | ret = ustctl_release_object(sock, ua_chan->obj); |
fb45065e | 483 | pthread_mutex_unlock(&app->sock_lock); |
ffe60014 DG |
484 | if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
485 | ERR("UST app sock %d release channel obj failed with ret %d", | |
486 | sock, ret); | |
487 | } | |
7972aab2 | 488 | lttng_fd_put(LTTNG_FD_APPS, 1); |
edb67388 DG |
489 | free(ua_chan->obj); |
490 | } | |
36b588ed | 491 | call_rcu(&ua_chan->rcu_head, delete_ust_app_channel_rcu); |
d80a6244 DG |
492 | } |
493 | ||
fb45065e MD |
494 | int ust_app_register_done(struct ust_app *app) |
495 | { | |
496 | int ret; | |
497 | ||
498 | pthread_mutex_lock(&app->sock_lock); | |
499 | ret = ustctl_register_done(app->sock); | |
500 | pthread_mutex_unlock(&app->sock_lock); | |
501 | return ret; | |
502 | } | |
503 | ||
504 | int ust_app_release_object(struct ust_app *app, struct lttng_ust_object_data *data) | |
505 | { | |
506 | int ret, sock; | |
507 | ||
508 | if (app) { | |
509 | pthread_mutex_lock(&app->sock_lock); | |
510 | sock = app->sock; | |
511 | } else { | |
512 | sock = -1; | |
513 | } | |
514 | ret = ustctl_release_object(sock, data); | |
515 | if (app) { | |
516 | pthread_mutex_unlock(&app->sock_lock); | |
517 | } | |
518 | return ret; | |
519 | } | |
520 | ||
331744e3 | 521 | /* |
1b532a60 DG |
522 | * Push metadata to consumer socket. |
523 | * | |
dc2bbdae MD |
524 | * RCU read-side lock must be held to guarantee existance of socket. |
525 | * Must be called with the ust app session lock held. | |
526 | * Must be called with the registry lock held. | |
331744e3 JD |
527 | * |
528 | * On success, return the len of metadata pushed or else a negative value. | |
2c57e06d MD |
529 | * Returning a -EPIPE return value means we could not send the metadata, |
530 | * but it can be caused by recoverable errors (e.g. the application has | |
531 | * terminated concurrently). | |
331744e3 JD |
532 | */ |
533 | ssize_t ust_app_push_metadata(struct ust_registry_session *registry, | |
534 | struct consumer_socket *socket, int send_zero_data) | |
535 | { | |
536 | int ret; | |
537 | char *metadata_str = NULL; | |
c585821b | 538 | size_t len, offset, new_metadata_len_sent; |
331744e3 | 539 | ssize_t ret_val; |
c585821b | 540 | uint64_t metadata_key; |
331744e3 JD |
541 | |
542 | assert(registry); | |
543 | assert(socket); | |
1b532a60 | 544 | |
c585821b MD |
545 | metadata_key = registry->metadata_key; |
546 | ||
ce34fcd0 | 547 | /* |
dc2bbdae MD |
548 | * Means that no metadata was assigned to the session. This can |
549 | * happens if no start has been done previously. | |
ce34fcd0 | 550 | */ |
c585821b | 551 | if (!metadata_key) { |
ce34fcd0 MD |
552 | return 0; |
553 | } | |
554 | ||
1b532a60 | 555 | /* |
dc2bbdae MD |
556 | * On a push metadata error either the consumer is dead or the |
557 | * metadata channel has been destroyed because its endpoint | |
2c57e06d MD |
558 | * might have died (e.g: relayd), or because the application has |
559 | * exited. If so, the metadata closed flag is set to 1 so we | |
560 | * deny pushing metadata again which is not valid anymore on the | |
561 | * consumer side. | |
1b532a60 DG |
562 | */ |
563 | if (registry->metadata_closed) { | |
564 | return -EPIPE; | |
565 | } | |
331744e3 | 566 | |
331744e3 JD |
567 | offset = registry->metadata_len_sent; |
568 | len = registry->metadata_len - registry->metadata_len_sent; | |
c585821b | 569 | new_metadata_len_sent = registry->metadata_len; |
331744e3 JD |
570 | if (len == 0) { |
571 | DBG3("No metadata to push for metadata key %" PRIu64, | |
572 | registry->metadata_key); | |
573 | ret_val = len; | |
574 | if (send_zero_data) { | |
575 | DBG("No metadata to push"); | |
576 | goto push_data; | |
577 | } | |
578 | goto end; | |
579 | } | |
580 | ||
581 | /* Allocate only what we have to send. */ | |
582 | metadata_str = zmalloc(len); | |
583 | if (!metadata_str) { | |
584 | PERROR("zmalloc ust app metadata string"); | |
585 | ret_val = -ENOMEM; | |
586 | goto error; | |
587 | } | |
c585821b | 588 | /* Copy what we haven't sent out. */ |
331744e3 | 589 | memcpy(metadata_str, registry->metadata + offset, len); |
331744e3 JD |
590 | |
591 | push_data: | |
c585821b MD |
592 | pthread_mutex_unlock(®istry->lock); |
593 | /* | |
594 | * We need to unlock the registry while we push metadata to | |
595 | * break a circular dependency between the consumerd metadata | |
596 | * lock and the sessiond registry lock. Indeed, pushing metadata | |
597 | * to the consumerd awaits that it gets pushed all the way to | |
598 | * relayd, but doing so requires grabbing the metadata lock. If | |
599 | * a concurrent metadata request is being performed by | |
600 | * consumerd, this can try to grab the registry lock on the | |
601 | * sessiond while holding the metadata lock on the consumer | |
602 | * daemon. Those push and pull schemes are performed on two | |
603 | * different bidirectionnal communication sockets. | |
604 | */ | |
605 | ret = consumer_push_metadata(socket, metadata_key, | |
331744e3 | 606 | metadata_str, len, offset); |
c585821b | 607 | pthread_mutex_lock(®istry->lock); |
331744e3 | 608 | if (ret < 0) { |
000baf6a | 609 | /* |
dc2bbdae MD |
610 | * There is an acceptable race here between the registry |
611 | * metadata key assignment and the creation on the | |
612 | * consumer. The session daemon can concurrently push | |
613 | * metadata for this registry while being created on the | |
614 | * consumer since the metadata key of the registry is | |
615 | * assigned *before* it is setup to avoid the consumer | |
616 | * to ask for metadata that could possibly be not found | |
617 | * in the session daemon. | |
000baf6a | 618 | * |
dc2bbdae MD |
619 | * The metadata will get pushed either by the session |
620 | * being stopped or the consumer requesting metadata if | |
621 | * that race is triggered. | |
000baf6a DG |
622 | */ |
623 | if (ret == -LTTCOMM_CONSUMERD_CHANNEL_FAIL) { | |
624 | ret = 0; | |
c585821b MD |
625 | } else { |
626 | ERR("Error pushing metadata to consumer"); | |
000baf6a | 627 | } |
331744e3 JD |
628 | ret_val = ret; |
629 | goto error_push; | |
c585821b MD |
630 | } else { |
631 | /* | |
632 | * Metadata may have been concurrently pushed, since | |
633 | * we're not holding the registry lock while pushing to | |
634 | * consumer. This is handled by the fact that we send | |
635 | * the metadata content, size, and the offset at which | |
636 | * that metadata belongs. This may arrive out of order | |
637 | * on the consumer side, and the consumer is able to | |
638 | * deal with overlapping fragments. The consumer | |
639 | * supports overlapping fragments, which must be | |
640 | * contiguous starting from offset 0. We keep the | |
641 | * largest metadata_len_sent value of the concurrent | |
642 | * send. | |
643 | */ | |
644 | registry->metadata_len_sent = | |
645 | max_t(size_t, registry->metadata_len_sent, | |
646 | new_metadata_len_sent); | |
331744e3 | 647 | } |
331744e3 JD |
648 | free(metadata_str); |
649 | return len; | |
650 | ||
651 | end: | |
652 | error: | |
ce34fcd0 MD |
653 | if (ret_val) { |
654 | /* | |
dc2bbdae MD |
655 | * On error, flag the registry that the metadata is |
656 | * closed. We were unable to push anything and this | |
657 | * means that either the consumer is not responding or | |
658 | * the metadata cache has been destroyed on the | |
659 | * consumer. | |
ce34fcd0 MD |
660 | */ |
661 | registry->metadata_closed = 1; | |
662 | } | |
331744e3 JD |
663 | error_push: |
664 | free(metadata_str); | |
665 | return ret_val; | |
666 | } | |
667 | ||
d88aee68 | 668 | /* |
ce34fcd0 | 669 | * For a given application and session, push metadata to consumer. |
331744e3 JD |
670 | * Either sock or consumer is required : if sock is NULL, the default |
671 | * socket to send the metadata is retrieved from consumer, if sock | |
672 | * is not NULL we use it to send the metadata. | |
ce34fcd0 | 673 | * RCU read-side lock must be held while calling this function, |
dc2bbdae MD |
674 | * therefore ensuring existance of registry. It also ensures existance |
675 | * of socket throughout this function. | |
d88aee68 DG |
676 | * |
677 | * Return 0 on success else a negative error. | |
2c57e06d MD |
678 | * Returning a -EPIPE return value means we could not send the metadata, |
679 | * but it can be caused by recoverable errors (e.g. the application has | |
680 | * terminated concurrently). | |
d88aee68 | 681 | */ |
7972aab2 DG |
682 | static int push_metadata(struct ust_registry_session *registry, |
683 | struct consumer_output *consumer) | |
d88aee68 | 684 | { |
331744e3 JD |
685 | int ret_val; |
686 | ssize_t ret; | |
d88aee68 DG |
687 | struct consumer_socket *socket; |
688 | ||
7972aab2 DG |
689 | assert(registry); |
690 | assert(consumer); | |
691 | ||
ce34fcd0 | 692 | pthread_mutex_lock(®istry->lock); |
ce34fcd0 | 693 | if (registry->metadata_closed) { |
dc2bbdae MD |
694 | ret_val = -EPIPE; |
695 | goto error; | |
d88aee68 DG |
696 | } |
697 | ||
d88aee68 | 698 | /* Get consumer socket to use to push the metadata.*/ |
7972aab2 DG |
699 | socket = consumer_find_socket_by_bitness(registry->bits_per_long, |
700 | consumer); | |
d88aee68 | 701 | if (!socket) { |
331744e3 | 702 | ret_val = -1; |
ce34fcd0 | 703 | goto error; |
d88aee68 DG |
704 | } |
705 | ||
331744e3 | 706 | ret = ust_app_push_metadata(registry, socket, 0); |
d88aee68 | 707 | if (ret < 0) { |
331744e3 | 708 | ret_val = ret; |
ce34fcd0 | 709 | goto error; |
d88aee68 | 710 | } |
dc2bbdae | 711 | pthread_mutex_unlock(®istry->lock); |
d88aee68 DG |
712 | return 0; |
713 | ||
ce34fcd0 | 714 | error: |
dc2bbdae | 715 | pthread_mutex_unlock(®istry->lock); |
331744e3 | 716 | return ret_val; |
d88aee68 DG |
717 | } |
718 | ||
719 | /* | |
720 | * Send to the consumer a close metadata command for the given session. Once | |
721 | * done, the metadata channel is deleted and the session metadata pointer is | |
dc2bbdae | 722 | * nullified. The session lock MUST be held unless the application is |
d88aee68 DG |
723 | * in the destroy path. |
724 | * | |
725 | * Return 0 on success else a negative value. | |
726 | */ | |
7972aab2 DG |
727 | static int close_metadata(struct ust_registry_session *registry, |
728 | struct consumer_output *consumer) | |
d88aee68 DG |
729 | { |
730 | int ret; | |
731 | struct consumer_socket *socket; | |
732 | ||
7972aab2 DG |
733 | assert(registry); |
734 | assert(consumer); | |
d88aee68 | 735 | |
7972aab2 DG |
736 | rcu_read_lock(); |
737 | ||
ce34fcd0 MD |
738 | pthread_mutex_lock(®istry->lock); |
739 | ||
7972aab2 | 740 | if (!registry->metadata_key || registry->metadata_closed) { |
d88aee68 | 741 | ret = 0; |
1b532a60 | 742 | goto end; |
d88aee68 DG |
743 | } |
744 | ||
d88aee68 | 745 | /* Get consumer socket to use to push the metadata.*/ |
7972aab2 DG |
746 | socket = consumer_find_socket_by_bitness(registry->bits_per_long, |
747 | consumer); | |
d88aee68 DG |
748 | if (!socket) { |
749 | ret = -1; | |
7972aab2 | 750 | goto error; |
d88aee68 DG |
751 | } |
752 | ||
7972aab2 | 753 | ret = consumer_close_metadata(socket, registry->metadata_key); |
d88aee68 | 754 | if (ret < 0) { |
7972aab2 | 755 | goto error; |
d88aee68 DG |
756 | } |
757 | ||
d88aee68 | 758 | error: |
1b532a60 DG |
759 | /* |
760 | * Metadata closed. Even on error this means that the consumer is not | |
761 | * responding or not found so either way a second close should NOT be emit | |
762 | * for this registry. | |
763 | */ | |
764 | registry->metadata_closed = 1; | |
765 | end: | |
ce34fcd0 | 766 | pthread_mutex_unlock(®istry->lock); |
7972aab2 | 767 | rcu_read_unlock(); |
d88aee68 DG |
768 | return ret; |
769 | } | |
770 | ||
36b588ed MD |
771 | /* |
772 | * We need to execute ht_destroy outside of RCU read-side critical | |
0b2dc8df MD |
773 | * section and outside of call_rcu thread, so we postpone its execution |
774 | * using ht_cleanup_push. It is simpler than to change the semantic of | |
775 | * the many callers of delete_ust_app_session(). | |
36b588ed MD |
776 | */ |
777 | static | |
778 | void delete_ust_app_session_rcu(struct rcu_head *head) | |
779 | { | |
780 | struct ust_app_session *ua_sess = | |
781 | caa_container_of(head, struct ust_app_session, rcu_head); | |
782 | ||
0b2dc8df | 783 | ht_cleanup_push(ua_sess->channels); |
36b588ed MD |
784 | free(ua_sess); |
785 | } | |
786 | ||
d80a6244 DG |
787 | /* |
788 | * Delete ust app session safely. RCU read lock must be held before calling | |
789 | * this function. | |
790 | */ | |
8b366481 | 791 | static |
d0b96690 DG |
792 | void delete_ust_app_session(int sock, struct ust_app_session *ua_sess, |
793 | struct ust_app *app) | |
d80a6244 DG |
794 | { |
795 | int ret; | |
bec39940 | 796 | struct lttng_ht_iter iter; |
d80a6244 | 797 | struct ust_app_channel *ua_chan; |
7972aab2 | 798 | struct ust_registry_session *registry; |
d80a6244 | 799 | |
d88aee68 DG |
800 | assert(ua_sess); |
801 | ||
1b532a60 DG |
802 | pthread_mutex_lock(&ua_sess->lock); |
803 | ||
b161602a MD |
804 | assert(!ua_sess->deleted); |
805 | ua_sess->deleted = true; | |
806 | ||
7972aab2 | 807 | registry = get_session_registry(ua_sess); |
ce34fcd0 | 808 | if (registry) { |
d88aee68 | 809 | /* Push metadata for application before freeing the application. */ |
7972aab2 | 810 | (void) push_metadata(registry, ua_sess->consumer); |
d88aee68 | 811 | |
7972aab2 DG |
812 | /* |
813 | * Don't ask to close metadata for global per UID buffers. Close | |
1b532a60 DG |
814 | * metadata only on destroy trace session in this case. Also, the |
815 | * previous push metadata could have flag the metadata registry to | |
816 | * close so don't send a close command if closed. | |
7972aab2 | 817 | */ |
ce34fcd0 | 818 | if (ua_sess->buffer_type != LTTNG_BUFFER_PER_UID) { |
7972aab2 DG |
819 | /* And ask to close it for this session registry. */ |
820 | (void) close_metadata(registry, ua_sess->consumer); | |
821 | } | |
d80a6244 DG |
822 | } |
823 | ||
bec39940 DG |
824 | cds_lfht_for_each_entry(ua_sess->channels->ht, &iter.iter, ua_chan, |
825 | node.node) { | |
826 | ret = lttng_ht_del(ua_sess->channels, &iter); | |
525b0740 | 827 | assert(!ret); |
d0b96690 | 828 | delete_ust_app_channel(sock, ua_chan, app); |
d80a6244 | 829 | } |
d80a6244 | 830 | |
7972aab2 DG |
831 | /* In case of per PID, the registry is kept in the session. */ |
832 | if (ua_sess->buffer_type == LTTNG_BUFFER_PER_PID) { | |
833 | struct buffer_reg_pid *reg_pid = buffer_reg_pid_find(ua_sess->id); | |
834 | if (reg_pid) { | |
835 | buffer_reg_pid_remove(reg_pid); | |
836 | buffer_reg_pid_destroy(reg_pid); | |
837 | } | |
838 | } | |
d0b96690 | 839 | |
aee6bafd | 840 | if (ua_sess->handle != -1) { |
fb45065e | 841 | pthread_mutex_lock(&app->sock_lock); |
ffe60014 | 842 | ret = ustctl_release_handle(sock, ua_sess->handle); |
fb45065e | 843 | pthread_mutex_unlock(&app->sock_lock); |
ffe60014 DG |
844 | if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
845 | ERR("UST app sock %d release session handle failed with ret %d", | |
846 | sock, ret); | |
847 | } | |
10b56aef MD |
848 | /* Remove session from application UST object descriptor. */ |
849 | iter.iter.node = &ua_sess->ust_objd_node.node; | |
850 | ret = lttng_ht_del(app->ust_sessions_objd, &iter); | |
851 | assert(!ret); | |
aee6bafd | 852 | } |
10b56aef | 853 | |
1b532a60 DG |
854 | pthread_mutex_unlock(&ua_sess->lock); |
855 | ||
6addfa37 MD |
856 | consumer_output_put(ua_sess->consumer); |
857 | ||
36b588ed | 858 | call_rcu(&ua_sess->rcu_head, delete_ust_app_session_rcu); |
d80a6244 | 859 | } |
91d76f53 DG |
860 | |
861 | /* | |
284d8f55 DG |
862 | * Delete a traceable application structure from the global list. Never call |
863 | * this function outside of a call_rcu call. | |
36b588ed MD |
864 | * |
865 | * RCU read side lock should _NOT_ be held when calling this function. | |
91d76f53 | 866 | */ |
8b366481 DG |
867 | static |
868 | void delete_ust_app(struct ust_app *app) | |
91d76f53 | 869 | { |
8b366481 | 870 | int ret, sock; |
d42f20df | 871 | struct ust_app_session *ua_sess, *tmp_ua_sess; |
44d3bd01 | 872 | |
d80a6244 | 873 | /* Delete ust app sessions info */ |
852d0037 DG |
874 | sock = app->sock; |
875 | app->sock = -1; | |
d80a6244 | 876 | |
8b366481 | 877 | /* Wipe sessions */ |
d42f20df DG |
878 | cds_list_for_each_entry_safe(ua_sess, tmp_ua_sess, &app->teardown_head, |
879 | teardown_node) { | |
880 | /* Free every object in the session and the session. */ | |
36b588ed | 881 | rcu_read_lock(); |
d0b96690 | 882 | delete_ust_app_session(sock, ua_sess, app); |
36b588ed | 883 | rcu_read_unlock(); |
d80a6244 | 884 | } |
36b588ed | 885 | |
0b2dc8df | 886 | ht_cleanup_push(app->sessions); |
10b56aef | 887 | ht_cleanup_push(app->ust_sessions_objd); |
0b2dc8df | 888 | ht_cleanup_push(app->ust_objd); |
d80a6244 | 889 | |
6414a713 | 890 | /* |
852d0037 DG |
891 | * Wait until we have deleted the application from the sock hash table |
892 | * before closing this socket, otherwise an application could re-use the | |
893 | * socket ID and race with the teardown, using the same hash table entry. | |
894 | * | |
895 | * It's OK to leave the close in call_rcu. We want it to stay unique for | |
896 | * all RCU readers that could run concurrently with unregister app, | |
897 | * therefore we _need_ to only close that socket after a grace period. So | |
898 | * it should stay in this RCU callback. | |
899 | * | |
900 | * This close() is a very important step of the synchronization model so | |
901 | * every modification to this function must be carefully reviewed. | |
6414a713 | 902 | */ |
799e2c4f MD |
903 | ret = close(sock); |
904 | if (ret) { | |
905 | PERROR("close"); | |
906 | } | |
4063050c | 907 | lttng_fd_put(LTTNG_FD_APPS, 1); |
d80a6244 | 908 | |
852d0037 | 909 | DBG2("UST app pid %d deleted", app->pid); |
284d8f55 | 910 | free(app); |
099e26bd DG |
911 | } |
912 | ||
913 | /* | |
f6a9efaa | 914 | * URCU intermediate call to delete an UST app. |
099e26bd | 915 | */ |
8b366481 DG |
916 | static |
917 | void delete_ust_app_rcu(struct rcu_head *head) | |
099e26bd | 918 | { |
bec39940 DG |
919 | struct lttng_ht_node_ulong *node = |
920 | caa_container_of(head, struct lttng_ht_node_ulong, head); | |
f6a9efaa | 921 | struct ust_app *app = |
852d0037 | 922 | caa_container_of(node, struct ust_app, pid_n); |
f6a9efaa | 923 | |
852d0037 | 924 | DBG3("Call RCU deleting app PID %d", app->pid); |
f6a9efaa | 925 | delete_ust_app(app); |
099e26bd DG |
926 | } |
927 | ||
ffe60014 DG |
928 | /* |
929 | * Delete the session from the application ht and delete the data structure by | |
930 | * freeing every object inside and releasing them. | |
931 | */ | |
d0b96690 | 932 | static void destroy_app_session(struct ust_app *app, |
ffe60014 DG |
933 | struct ust_app_session *ua_sess) |
934 | { | |
935 | int ret; | |
936 | struct lttng_ht_iter iter; | |
937 | ||
938 | assert(app); | |
939 | assert(ua_sess); | |
940 | ||
941 | iter.iter.node = &ua_sess->node.node; | |
942 | ret = lttng_ht_del(app->sessions, &iter); | |
943 | if (ret) { | |
944 | /* Already scheduled for teardown. */ | |
945 | goto end; | |
946 | } | |
947 | ||
948 | /* Once deleted, free the data structure. */ | |
d0b96690 | 949 | delete_ust_app_session(app->sock, ua_sess, app); |
ffe60014 DG |
950 | |
951 | end: | |
952 | return; | |
953 | } | |
954 | ||
8b366481 DG |
955 | /* |
956 | * Alloc new UST app session. | |
957 | */ | |
958 | static | |
d0b96690 | 959 | struct ust_app_session *alloc_ust_app_session(struct ust_app *app) |
8b366481 DG |
960 | { |
961 | struct ust_app_session *ua_sess; | |
962 | ||
963 | /* Init most of the default value by allocating and zeroing */ | |
964 | ua_sess = zmalloc(sizeof(struct ust_app_session)); | |
965 | if (ua_sess == NULL) { | |
966 | PERROR("malloc"); | |
ffe60014 | 967 | goto error_free; |
8b366481 DG |
968 | } |
969 | ||
970 | ua_sess->handle = -1; | |
bec39940 | 971 | ua_sess->channels = lttng_ht_new(0, LTTNG_HT_TYPE_STRING); |
ad7a9107 | 972 | ua_sess->metadata_attr.type = LTTNG_UST_CHAN_METADATA; |
84ad93e8 | 973 | pthread_mutex_init(&ua_sess->lock, NULL); |
ad7a9107 | 974 | |
8b366481 DG |
975 | return ua_sess; |
976 | ||
ffe60014 | 977 | error_free: |
8b366481 DG |
978 | return NULL; |
979 | } | |
980 | ||
981 | /* | |
982 | * Alloc new UST app channel. | |
983 | */ | |
984 | static | |
985 | struct ust_app_channel *alloc_ust_app_channel(char *name, | |
d0b96690 | 986 | struct ust_app_session *ua_sess, |
ffe60014 | 987 | struct lttng_ust_channel_attr *attr) |
8b366481 DG |
988 | { |
989 | struct ust_app_channel *ua_chan; | |
990 | ||
991 | /* Init most of the default value by allocating and zeroing */ | |
992 | ua_chan = zmalloc(sizeof(struct ust_app_channel)); | |
993 | if (ua_chan == NULL) { | |
994 | PERROR("malloc"); | |
995 | goto error; | |
996 | } | |
997 | ||
998 | /* Setup channel name */ | |
999 | strncpy(ua_chan->name, name, sizeof(ua_chan->name)); | |
1000 | ua_chan->name[sizeof(ua_chan->name) - 1] = '\0'; | |
1001 | ||
1002 | ua_chan->enabled = 1; | |
1003 | ua_chan->handle = -1; | |
45893984 | 1004 | ua_chan->session = ua_sess; |
ffe60014 | 1005 | ua_chan->key = get_next_channel_key(); |
bec39940 DG |
1006 | ua_chan->ctx = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); |
1007 | ua_chan->events = lttng_ht_new(0, LTTNG_HT_TYPE_STRING); | |
1008 | lttng_ht_node_init_str(&ua_chan->node, ua_chan->name); | |
8b366481 DG |
1009 | |
1010 | CDS_INIT_LIST_HEAD(&ua_chan->streams.head); | |
31746f93 | 1011 | CDS_INIT_LIST_HEAD(&ua_chan->ctx_list); |
8b366481 DG |
1012 | |
1013 | /* Copy attributes */ | |
1014 | if (attr) { | |
ffe60014 | 1015 | /* Translate from lttng_ust_channel to ustctl_consumer_channel_attr. */ |
2fe6e7f5 DG |
1016 | ua_chan->attr.subbuf_size = attr->subbuf_size; |
1017 | ua_chan->attr.num_subbuf = attr->num_subbuf; | |
1018 | ua_chan->attr.overwrite = attr->overwrite; | |
1019 | ua_chan->attr.switch_timer_interval = attr->switch_timer_interval; | |
1020 | ua_chan->attr.read_timer_interval = attr->read_timer_interval; | |
1021 | ua_chan->attr.output = attr->output; | |
8b366481 | 1022 | } |
ffe60014 DG |
1023 | /* By default, the channel is a per cpu channel. */ |
1024 | ua_chan->attr.type = LTTNG_UST_CHAN_PER_CPU; | |
8b366481 DG |
1025 | |
1026 | DBG3("UST app channel %s allocated", ua_chan->name); | |
1027 | ||
1028 | return ua_chan; | |
1029 | ||
1030 | error: | |
1031 | return NULL; | |
1032 | } | |
1033 | ||
37f1c236 DG |
1034 | /* |
1035 | * Allocate and initialize a UST app stream. | |
1036 | * | |
1037 | * Return newly allocated stream pointer or NULL on error. | |
1038 | */ | |
ffe60014 | 1039 | struct ust_app_stream *ust_app_alloc_stream(void) |
37f1c236 DG |
1040 | { |
1041 | struct ust_app_stream *stream = NULL; | |
1042 | ||
1043 | stream = zmalloc(sizeof(*stream)); | |
1044 | if (stream == NULL) { | |
1045 | PERROR("zmalloc ust app stream"); | |
1046 | goto error; | |
1047 | } | |
1048 | ||
1049 | /* Zero could be a valid value for a handle so flag it to -1. */ | |
1050 | stream->handle = -1; | |
1051 | ||
1052 | error: | |
1053 | return stream; | |
1054 | } | |
1055 | ||
8b366481 DG |
1056 | /* |
1057 | * Alloc new UST app event. | |
1058 | */ | |
1059 | static | |
1060 | struct ust_app_event *alloc_ust_app_event(char *name, | |
1061 | struct lttng_ust_event *attr) | |
1062 | { | |
1063 | struct ust_app_event *ua_event; | |
1064 | ||
1065 | /* Init most of the default value by allocating and zeroing */ | |
1066 | ua_event = zmalloc(sizeof(struct ust_app_event)); | |
1067 | if (ua_event == NULL) { | |
1068 | PERROR("malloc"); | |
1069 | goto error; | |
1070 | } | |
1071 | ||
1072 | ua_event->enabled = 1; | |
1073 | strncpy(ua_event->name, name, sizeof(ua_event->name)); | |
1074 | ua_event->name[sizeof(ua_event->name) - 1] = '\0'; | |
bec39940 | 1075 | lttng_ht_node_init_str(&ua_event->node, ua_event->name); |
8b366481 DG |
1076 | |
1077 | /* Copy attributes */ | |
1078 | if (attr) { | |
1079 | memcpy(&ua_event->attr, attr, sizeof(ua_event->attr)); | |
1080 | } | |
1081 | ||
1082 | DBG3("UST app event %s allocated", ua_event->name); | |
1083 | ||
1084 | return ua_event; | |
1085 | ||
1086 | error: | |
1087 | return NULL; | |
1088 | } | |
1089 | ||
1090 | /* | |
1091 | * Alloc new UST app context. | |
1092 | */ | |
1093 | static | |
bdf64013 | 1094 | struct ust_app_ctx *alloc_ust_app_ctx(struct lttng_ust_context_attr *uctx) |
8b366481 DG |
1095 | { |
1096 | struct ust_app_ctx *ua_ctx; | |
1097 | ||
1098 | ua_ctx = zmalloc(sizeof(struct ust_app_ctx)); | |
1099 | if (ua_ctx == NULL) { | |
1100 | goto error; | |
1101 | } | |
1102 | ||
31746f93 DG |
1103 | CDS_INIT_LIST_HEAD(&ua_ctx->list); |
1104 | ||
8b366481 DG |
1105 | if (uctx) { |
1106 | memcpy(&ua_ctx->ctx, uctx, sizeof(ua_ctx->ctx)); | |
bdf64013 JG |
1107 | if (uctx->ctx == LTTNG_UST_CONTEXT_APP_CONTEXT) { |
1108 | char *provider_name = NULL, *ctx_name = NULL; | |
1109 | ||
1110 | provider_name = strdup(uctx->u.app_ctx.provider_name); | |
1111 | ctx_name = strdup(uctx->u.app_ctx.ctx_name); | |
1112 | if (!provider_name || !ctx_name) { | |
1113 | free(provider_name); | |
1114 | free(ctx_name); | |
1115 | goto error; | |
1116 | } | |
1117 | ||
1118 | ua_ctx->ctx.u.app_ctx.provider_name = provider_name; | |
1119 | ua_ctx->ctx.u.app_ctx.ctx_name = ctx_name; | |
1120 | } | |
8b366481 DG |
1121 | } |
1122 | ||
1123 | DBG3("UST app context %d allocated", ua_ctx->ctx.ctx); | |
8b366481 | 1124 | return ua_ctx; |
bdf64013 JG |
1125 | error: |
1126 | free(ua_ctx); | |
1127 | return NULL; | |
8b366481 DG |
1128 | } |
1129 | ||
025faf73 DG |
1130 | /* |
1131 | * Allocate a filter and copy the given original filter. | |
1132 | * | |
1133 | * Return allocated filter or NULL on error. | |
1134 | */ | |
51755dc8 JG |
1135 | static struct lttng_filter_bytecode *copy_filter_bytecode( |
1136 | struct lttng_filter_bytecode *orig_f) | |
025faf73 | 1137 | { |
51755dc8 | 1138 | struct lttng_filter_bytecode *filter = NULL; |
025faf73 DG |
1139 | |
1140 | /* Copy filter bytecode */ | |
1141 | filter = zmalloc(sizeof(*filter) + orig_f->len); | |
1142 | if (!filter) { | |
51755dc8 | 1143 | PERROR("zmalloc alloc filter bytecode"); |
025faf73 DG |
1144 | goto error; |
1145 | } | |
1146 | ||
1147 | memcpy(filter, orig_f, sizeof(*filter) + orig_f->len); | |
1148 | ||
1149 | error: | |
1150 | return filter; | |
1151 | } | |
1152 | ||
51755dc8 JG |
1153 | /* |
1154 | * Create a liblttng-ust filter bytecode from given bytecode. | |
1155 | * | |
1156 | * Return allocated filter or NULL on error. | |
1157 | */ | |
1158 | static struct lttng_ust_filter_bytecode *create_ust_bytecode_from_bytecode( | |
1159 | struct lttng_filter_bytecode *orig_f) | |
1160 | { | |
1161 | struct lttng_ust_filter_bytecode *filter = NULL; | |
1162 | ||
1163 | /* Copy filter bytecode */ | |
1164 | filter = zmalloc(sizeof(*filter) + orig_f->len); | |
1165 | if (!filter) { | |
1166 | PERROR("zmalloc alloc ust filter bytecode"); | |
1167 | goto error; | |
1168 | } | |
1169 | ||
1170 | assert(sizeof(struct lttng_filter_bytecode) == | |
1171 | sizeof(struct lttng_ust_filter_bytecode)); | |
1172 | memcpy(filter, orig_f, sizeof(*filter) + orig_f->len); | |
1173 | error: | |
1174 | return filter; | |
1175 | } | |
1176 | ||
099e26bd | 1177 | /* |
421cb601 DG |
1178 | * Find an ust_app using the sock and return it. RCU read side lock must be |
1179 | * held before calling this helper function. | |
099e26bd | 1180 | */ |
f20baf8e | 1181 | struct ust_app *ust_app_find_by_sock(int sock) |
099e26bd | 1182 | { |
bec39940 | 1183 | struct lttng_ht_node_ulong *node; |
bec39940 | 1184 | struct lttng_ht_iter iter; |
f6a9efaa | 1185 | |
852d0037 | 1186 | lttng_ht_lookup(ust_app_ht_by_sock, (void *)((unsigned long) sock), &iter); |
bec39940 | 1187 | node = lttng_ht_iter_get_node_ulong(&iter); |
f6a9efaa DG |
1188 | if (node == NULL) { |
1189 | DBG2("UST app find by sock %d not found", sock); | |
f6a9efaa DG |
1190 | goto error; |
1191 | } | |
852d0037 DG |
1192 | |
1193 | return caa_container_of(node, struct ust_app, sock_n); | |
f6a9efaa DG |
1194 | |
1195 | error: | |
1196 | return NULL; | |
099e26bd DG |
1197 | } |
1198 | ||
d0b96690 DG |
1199 | /* |
1200 | * Find an ust_app using the notify sock and return it. RCU read side lock must | |
1201 | * be held before calling this helper function. | |
1202 | */ | |
1203 | static struct ust_app *find_app_by_notify_sock(int sock) | |
1204 | { | |
1205 | struct lttng_ht_node_ulong *node; | |
1206 | struct lttng_ht_iter iter; | |
1207 | ||
1208 | lttng_ht_lookup(ust_app_ht_by_notify_sock, (void *)((unsigned long) sock), | |
1209 | &iter); | |
1210 | node = lttng_ht_iter_get_node_ulong(&iter); | |
1211 | if (node == NULL) { | |
1212 | DBG2("UST app find by notify sock %d not found", sock); | |
1213 | goto error; | |
1214 | } | |
1215 | ||
1216 | return caa_container_of(node, struct ust_app, notify_sock_n); | |
1217 | ||
1218 | error: | |
1219 | return NULL; | |
1220 | } | |
1221 | ||
025faf73 DG |
1222 | /* |
1223 | * Lookup for an ust app event based on event name, filter bytecode and the | |
1224 | * event loglevel. | |
1225 | * | |
1226 | * Return an ust_app_event object or NULL on error. | |
1227 | */ | |
18eace3b | 1228 | static struct ust_app_event *find_ust_app_event(struct lttng_ht *ht, |
2106efa0 PP |
1229 | char *name, struct lttng_filter_bytecode *filter, |
1230 | int loglevel_value, | |
39c5a3a7 | 1231 | const struct lttng_event_exclusion *exclusion) |
18eace3b DG |
1232 | { |
1233 | struct lttng_ht_iter iter; | |
1234 | struct lttng_ht_node_str *node; | |
1235 | struct ust_app_event *event = NULL; | |
1236 | struct ust_app_ht_key key; | |
18eace3b DG |
1237 | |
1238 | assert(name); | |
1239 | assert(ht); | |
1240 | ||
1241 | /* Setup key for event lookup. */ | |
1242 | key.name = name; | |
1243 | key.filter = filter; | |
2106efa0 | 1244 | key.loglevel_type = loglevel_value; |
39c5a3a7 | 1245 | /* lttng_event_exclusion and lttng_ust_event_exclusion structures are similar */ |
51755dc8 | 1246 | key.exclusion = exclusion; |
18eace3b | 1247 | |
025faf73 DG |
1248 | /* Lookup using the event name as hash and a custom match fct. */ |
1249 | cds_lfht_lookup(ht->ht, ht->hash_fct((void *) name, lttng_ht_seed), | |
1250 | ht_match_ust_app_event, &key, &iter.iter); | |
18eace3b DG |
1251 | node = lttng_ht_iter_get_node_str(&iter); |
1252 | if (node == NULL) { | |
1253 | goto end; | |
1254 | } | |
1255 | ||
1256 | event = caa_container_of(node, struct ust_app_event, node); | |
1257 | ||
1258 | end: | |
18eace3b DG |
1259 | return event; |
1260 | } | |
1261 | ||
55cc08a6 DG |
1262 | /* |
1263 | * Create the channel context on the tracer. | |
d0b96690 DG |
1264 | * |
1265 | * Called with UST app session lock held. | |
55cc08a6 DG |
1266 | */ |
1267 | static | |
1268 | int create_ust_channel_context(struct ust_app_channel *ua_chan, | |
1269 | struct ust_app_ctx *ua_ctx, struct ust_app *app) | |
1270 | { | |
1271 | int ret; | |
1272 | ||
840cb59c | 1273 | health_code_update(); |
86acf0da | 1274 | |
fb45065e | 1275 | pthread_mutex_lock(&app->sock_lock); |
852d0037 | 1276 | ret = ustctl_add_context(app->sock, &ua_ctx->ctx, |
55cc08a6 | 1277 | ua_chan->obj, &ua_ctx->obj); |
fb45065e | 1278 | pthread_mutex_unlock(&app->sock_lock); |
55cc08a6 | 1279 | if (ret < 0) { |
ffe60014 DG |
1280 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
1281 | ERR("UST app create channel context failed for app (pid: %d) " | |
1282 | "with ret %d", app->pid, ret); | |
1283 | } else { | |
3757b385 DG |
1284 | /* |
1285 | * This is normal behavior, an application can die during the | |
1286 | * creation process. Don't report an error so the execution can | |
1287 | * continue normally. | |
1288 | */ | |
1289 | ret = 0; | |
ffe60014 DG |
1290 | DBG3("UST app disable event failed. Application is dead."); |
1291 | } | |
55cc08a6 DG |
1292 | goto error; |
1293 | } | |
1294 | ||
1295 | ua_ctx->handle = ua_ctx->obj->handle; | |
1296 | ||
d0b96690 DG |
1297 | DBG2("UST app context handle %d created successfully for channel %s", |
1298 | ua_ctx->handle, ua_chan->name); | |
55cc08a6 DG |
1299 | |
1300 | error: | |
840cb59c | 1301 | health_code_update(); |
55cc08a6 DG |
1302 | return ret; |
1303 | } | |
1304 | ||
53a80697 MD |
1305 | /* |
1306 | * Set the filter on the tracer. | |
1307 | */ | |
1308 | static | |
1309 | int set_ust_event_filter(struct ust_app_event *ua_event, | |
1310 | struct ust_app *app) | |
1311 | { | |
1312 | int ret; | |
51755dc8 | 1313 | struct lttng_ust_filter_bytecode *ust_bytecode = NULL; |
53a80697 | 1314 | |
840cb59c | 1315 | health_code_update(); |
86acf0da | 1316 | |
53a80697 | 1317 | if (!ua_event->filter) { |
86acf0da DG |
1318 | ret = 0; |
1319 | goto error; | |
53a80697 MD |
1320 | } |
1321 | ||
51755dc8 JG |
1322 | ust_bytecode = create_ust_bytecode_from_bytecode(ua_event->filter); |
1323 | if (!ust_bytecode) { | |
1324 | ret = -LTTNG_ERR_NOMEM; | |
1325 | goto error; | |
1326 | } | |
fb45065e | 1327 | pthread_mutex_lock(&app->sock_lock); |
51755dc8 | 1328 | ret = ustctl_set_filter(app->sock, ust_bytecode, |
53a80697 | 1329 | ua_event->obj); |
fb45065e | 1330 | pthread_mutex_unlock(&app->sock_lock); |
53a80697 | 1331 | if (ret < 0) { |
ffe60014 DG |
1332 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
1333 | ERR("UST app event %s filter failed for app (pid: %d) " | |
1334 | "with ret %d", ua_event->attr.name, app->pid, ret); | |
1335 | } else { | |
3757b385 DG |
1336 | /* |
1337 | * This is normal behavior, an application can die during the | |
1338 | * creation process. Don't report an error so the execution can | |
1339 | * continue normally. | |
1340 | */ | |
1341 | ret = 0; | |
ffe60014 DG |
1342 | DBG3("UST app filter event failed. Application is dead."); |
1343 | } | |
53a80697 MD |
1344 | goto error; |
1345 | } | |
1346 | ||
1347 | DBG2("UST filter set successfully for event %s", ua_event->name); | |
1348 | ||
1349 | error: | |
840cb59c | 1350 | health_code_update(); |
51755dc8 | 1351 | free(ust_bytecode); |
53a80697 MD |
1352 | return ret; |
1353 | } | |
1354 | ||
51755dc8 JG |
1355 | static |
1356 | struct lttng_ust_event_exclusion *create_ust_exclusion_from_exclusion( | |
1357 | struct lttng_event_exclusion *exclusion) | |
1358 | { | |
1359 | struct lttng_ust_event_exclusion *ust_exclusion = NULL; | |
1360 | size_t exclusion_alloc_size = sizeof(struct lttng_ust_event_exclusion) + | |
1361 | LTTNG_UST_SYM_NAME_LEN * exclusion->count; | |
1362 | ||
1363 | ust_exclusion = zmalloc(exclusion_alloc_size); | |
1364 | if (!ust_exclusion) { | |
1365 | PERROR("malloc"); | |
1366 | goto end; | |
1367 | } | |
1368 | ||
1369 | assert(sizeof(struct lttng_event_exclusion) == | |
1370 | sizeof(struct lttng_ust_event_exclusion)); | |
1371 | memcpy(ust_exclusion, exclusion, exclusion_alloc_size); | |
1372 | end: | |
1373 | return ust_exclusion; | |
1374 | } | |
1375 | ||
7cc9a73c JI |
1376 | /* |
1377 | * Set event exclusions on the tracer. | |
1378 | */ | |
1379 | static | |
1380 | int set_ust_event_exclusion(struct ust_app_event *ua_event, | |
1381 | struct ust_app *app) | |
1382 | { | |
1383 | int ret; | |
51755dc8 | 1384 | struct lttng_ust_event_exclusion *ust_exclusion = NULL; |
7cc9a73c JI |
1385 | |
1386 | health_code_update(); | |
1387 | ||
1388 | if (!ua_event->exclusion || !ua_event->exclusion->count) { | |
1389 | ret = 0; | |
1390 | goto error; | |
1391 | } | |
1392 | ||
51755dc8 JG |
1393 | ust_exclusion = create_ust_exclusion_from_exclusion( |
1394 | ua_event->exclusion); | |
1395 | if (!ust_exclusion) { | |
1396 | ret = -LTTNG_ERR_NOMEM; | |
1397 | goto error; | |
1398 | } | |
fb45065e | 1399 | pthread_mutex_lock(&app->sock_lock); |
51755dc8 | 1400 | ret = ustctl_set_exclusion(app->sock, ust_exclusion, ua_event->obj); |
fb45065e | 1401 | pthread_mutex_unlock(&app->sock_lock); |
7cc9a73c JI |
1402 | if (ret < 0) { |
1403 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
1404 | ERR("UST app event %s exclusions failed for app (pid: %d) " | |
1405 | "with ret %d", ua_event->attr.name, app->pid, ret); | |
1406 | } else { | |
1407 | /* | |
1408 | * This is normal behavior, an application can die during the | |
1409 | * creation process. Don't report an error so the execution can | |
1410 | * continue normally. | |
1411 | */ | |
1412 | ret = 0; | |
1413 | DBG3("UST app event exclusion failed. Application is dead."); | |
1414 | } | |
1415 | goto error; | |
1416 | } | |
1417 | ||
1418 | DBG2("UST exclusion set successfully for event %s", ua_event->name); | |
1419 | ||
1420 | error: | |
1421 | health_code_update(); | |
51755dc8 | 1422 | free(ust_exclusion); |
7cc9a73c JI |
1423 | return ret; |
1424 | } | |
1425 | ||
9730260e DG |
1426 | /* |
1427 | * Disable the specified event on to UST tracer for the UST session. | |
1428 | */ | |
1429 | static int disable_ust_event(struct ust_app *app, | |
1430 | struct ust_app_session *ua_sess, struct ust_app_event *ua_event) | |
1431 | { | |
1432 | int ret; | |
1433 | ||
840cb59c | 1434 | health_code_update(); |
86acf0da | 1435 | |
fb45065e | 1436 | pthread_mutex_lock(&app->sock_lock); |
852d0037 | 1437 | ret = ustctl_disable(app->sock, ua_event->obj); |
fb45065e | 1438 | pthread_mutex_unlock(&app->sock_lock); |
9730260e | 1439 | if (ret < 0) { |
ffe60014 DG |
1440 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
1441 | ERR("UST app event %s disable failed for app (pid: %d) " | |
1442 | "and session handle %d with ret %d", | |
1443 | ua_event->attr.name, app->pid, ua_sess->handle, ret); | |
1444 | } else { | |
3757b385 DG |
1445 | /* |
1446 | * This is normal behavior, an application can die during the | |
1447 | * creation process. Don't report an error so the execution can | |
1448 | * continue normally. | |
1449 | */ | |
1450 | ret = 0; | |
ffe60014 DG |
1451 | DBG3("UST app disable event failed. Application is dead."); |
1452 | } | |
9730260e DG |
1453 | goto error; |
1454 | } | |
1455 | ||
1456 | DBG2("UST app event %s disabled successfully for app (pid: %d)", | |
852d0037 | 1457 | ua_event->attr.name, app->pid); |
9730260e DG |
1458 | |
1459 | error: | |
840cb59c | 1460 | health_code_update(); |
9730260e DG |
1461 | return ret; |
1462 | } | |
1463 | ||
78f0bacd DG |
1464 | /* |
1465 | * Disable the specified channel on to UST tracer for the UST session. | |
1466 | */ | |
1467 | static int disable_ust_channel(struct ust_app *app, | |
1468 | struct ust_app_session *ua_sess, struct ust_app_channel *ua_chan) | |
1469 | { | |
1470 | int ret; | |
1471 | ||
840cb59c | 1472 | health_code_update(); |
86acf0da | 1473 | |
fb45065e | 1474 | pthread_mutex_lock(&app->sock_lock); |
852d0037 | 1475 | ret = ustctl_disable(app->sock, ua_chan->obj); |
fb45065e | 1476 | pthread_mutex_unlock(&app->sock_lock); |
78f0bacd | 1477 | if (ret < 0) { |
ffe60014 DG |
1478 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
1479 | ERR("UST app channel %s disable failed for app (pid: %d) " | |
1480 | "and session handle %d with ret %d", | |
1481 | ua_chan->name, app->pid, ua_sess->handle, ret); | |
1482 | } else { | |
3757b385 DG |
1483 | /* |
1484 | * This is normal behavior, an application can die during the | |
1485 | * creation process. Don't report an error so the execution can | |
1486 | * continue normally. | |
1487 | */ | |
1488 | ret = 0; | |
ffe60014 DG |
1489 | DBG3("UST app disable channel failed. Application is dead."); |
1490 | } | |
78f0bacd DG |
1491 | goto error; |
1492 | } | |
1493 | ||
78f0bacd | 1494 | DBG2("UST app channel %s disabled successfully for app (pid: %d)", |
852d0037 | 1495 | ua_chan->name, app->pid); |
78f0bacd DG |
1496 | |
1497 | error: | |
840cb59c | 1498 | health_code_update(); |
78f0bacd DG |
1499 | return ret; |
1500 | } | |
1501 | ||
1502 | /* | |
1503 | * Enable the specified channel on to UST tracer for the UST session. | |
1504 | */ | |
1505 | static int enable_ust_channel(struct ust_app *app, | |
1506 | struct ust_app_session *ua_sess, struct ust_app_channel *ua_chan) | |
1507 | { | |
1508 | int ret; | |
1509 | ||
840cb59c | 1510 | health_code_update(); |
86acf0da | 1511 | |
fb45065e | 1512 | pthread_mutex_lock(&app->sock_lock); |
852d0037 | 1513 | ret = ustctl_enable(app->sock, ua_chan->obj); |
fb45065e | 1514 | pthread_mutex_unlock(&app->sock_lock); |
78f0bacd | 1515 | if (ret < 0) { |
ffe60014 DG |
1516 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
1517 | ERR("UST app channel %s enable failed for app (pid: %d) " | |
1518 | "and session handle %d with ret %d", | |
1519 | ua_chan->name, app->pid, ua_sess->handle, ret); | |
1520 | } else { | |
3757b385 DG |
1521 | /* |
1522 | * This is normal behavior, an application can die during the | |
1523 | * creation process. Don't report an error so the execution can | |
1524 | * continue normally. | |
1525 | */ | |
1526 | ret = 0; | |
ffe60014 DG |
1527 | DBG3("UST app enable channel failed. Application is dead."); |
1528 | } | |
78f0bacd DG |
1529 | goto error; |
1530 | } | |
1531 | ||
1532 | ua_chan->enabled = 1; | |
1533 | ||
1534 | DBG2("UST app channel %s enabled successfully for app (pid: %d)", | |
852d0037 | 1535 | ua_chan->name, app->pid); |
78f0bacd DG |
1536 | |
1537 | error: | |
840cb59c | 1538 | health_code_update(); |
78f0bacd DG |
1539 | return ret; |
1540 | } | |
1541 | ||
edb67388 DG |
1542 | /* |
1543 | * Enable the specified event on to UST tracer for the UST session. | |
1544 | */ | |
1545 | static int enable_ust_event(struct ust_app *app, | |
1546 | struct ust_app_session *ua_sess, struct ust_app_event *ua_event) | |
1547 | { | |
1548 | int ret; | |
1549 | ||
840cb59c | 1550 | health_code_update(); |
86acf0da | 1551 | |
fb45065e | 1552 | pthread_mutex_lock(&app->sock_lock); |
852d0037 | 1553 | ret = ustctl_enable(app->sock, ua_event->obj); |
fb45065e | 1554 | pthread_mutex_unlock(&app->sock_lock); |
edb67388 | 1555 | if (ret < 0) { |
ffe60014 DG |
1556 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
1557 | ERR("UST app event %s enable failed for app (pid: %d) " | |
1558 | "and session handle %d with ret %d", | |
1559 | ua_event->attr.name, app->pid, ua_sess->handle, ret); | |
1560 | } else { | |
3757b385 DG |
1561 | /* |
1562 | * This is normal behavior, an application can die during the | |
1563 | * creation process. Don't report an error so the execution can | |
1564 | * continue normally. | |
1565 | */ | |
1566 | ret = 0; | |
ffe60014 DG |
1567 | DBG3("UST app enable event failed. Application is dead."); |
1568 | } | |
edb67388 DG |
1569 | goto error; |
1570 | } | |
1571 | ||
1572 | DBG2("UST app event %s enabled successfully for app (pid: %d)", | |
852d0037 | 1573 | ua_event->attr.name, app->pid); |
edb67388 DG |
1574 | |
1575 | error: | |
840cb59c | 1576 | health_code_update(); |
edb67388 DG |
1577 | return ret; |
1578 | } | |
1579 | ||
099e26bd | 1580 | /* |
7972aab2 | 1581 | * Send channel and stream buffer to application. |
4f3ab6ee | 1582 | * |
ffe60014 | 1583 | * Return 0 on success. On error, a negative value is returned. |
4f3ab6ee | 1584 | */ |
7972aab2 DG |
1585 | static int send_channel_pid_to_ust(struct ust_app *app, |
1586 | struct ust_app_session *ua_sess, struct ust_app_channel *ua_chan) | |
4f3ab6ee DG |
1587 | { |
1588 | int ret; | |
ffe60014 | 1589 | struct ust_app_stream *stream, *stmp; |
4f3ab6ee DG |
1590 | |
1591 | assert(app); | |
ffe60014 | 1592 | assert(ua_sess); |
4f3ab6ee | 1593 | assert(ua_chan); |
4f3ab6ee | 1594 | |
840cb59c | 1595 | health_code_update(); |
4f3ab6ee | 1596 | |
7972aab2 DG |
1597 | DBG("UST app sending channel %s to UST app sock %d", ua_chan->name, |
1598 | app->sock); | |
86acf0da | 1599 | |
ffe60014 DG |
1600 | /* Send channel to the application. */ |
1601 | ret = ust_consumer_send_channel_to_ust(app, ua_sess, ua_chan); | |
a7169585 MD |
1602 | if (ret == -EPIPE || ret == -LTTNG_UST_ERR_EXITING) { |
1603 | ret = -ENOTCONN; /* Caused by app exiting. */ | |
1604 | goto error; | |
1605 | } else if (ret < 0) { | |
b551a063 DG |
1606 | goto error; |
1607 | } | |
1608 | ||
d88aee68 DG |
1609 | health_code_update(); |
1610 | ||
ffe60014 DG |
1611 | /* Send all streams to application. */ |
1612 | cds_list_for_each_entry_safe(stream, stmp, &ua_chan->streams.head, list) { | |
1613 | ret = ust_consumer_send_stream_to_ust(app, ua_chan, stream); | |
a7169585 MD |
1614 | if (ret == -EPIPE || ret == -LTTNG_UST_ERR_EXITING) { |
1615 | ret = -ENOTCONN; /* Caused by app exiting. */ | |
1616 | goto error; | |
1617 | } else if (ret < 0) { | |
ffe60014 DG |
1618 | goto error; |
1619 | } | |
1620 | /* We don't need the stream anymore once sent to the tracer. */ | |
1621 | cds_list_del(&stream->list); | |
fb45065e | 1622 | delete_ust_app_stream(-1, stream, app); |
ffe60014 | 1623 | } |
ffe60014 DG |
1624 | /* Flag the channel that it is sent to the application. */ |
1625 | ua_chan->is_sent = 1; | |
ffe60014 | 1626 | |
b551a063 | 1627 | error: |
840cb59c | 1628 | health_code_update(); |
b551a063 DG |
1629 | return ret; |
1630 | } | |
1631 | ||
91d76f53 | 1632 | /* |
5b4a0ec0 | 1633 | * Create the specified event onto the UST tracer for a UST session. |
d0b96690 DG |
1634 | * |
1635 | * Should be called with session mutex held. | |
91d76f53 | 1636 | */ |
edb67388 DG |
1637 | static |
1638 | int create_ust_event(struct ust_app *app, struct ust_app_session *ua_sess, | |
1639 | struct ust_app_channel *ua_chan, struct ust_app_event *ua_event) | |
91d76f53 | 1640 | { |
5b4a0ec0 | 1641 | int ret = 0; |
284d8f55 | 1642 | |
840cb59c | 1643 | health_code_update(); |
86acf0da | 1644 | |
5b4a0ec0 | 1645 | /* Create UST event on tracer */ |
fb45065e | 1646 | pthread_mutex_lock(&app->sock_lock); |
852d0037 | 1647 | ret = ustctl_create_event(app->sock, &ua_event->attr, ua_chan->obj, |
5b4a0ec0 | 1648 | &ua_event->obj); |
fb45065e | 1649 | pthread_mutex_unlock(&app->sock_lock); |
5b4a0ec0 | 1650 | if (ret < 0) { |
ffe60014 DG |
1651 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
1652 | ERR("Error ustctl create event %s for app pid: %d with ret %d", | |
1653 | ua_event->attr.name, app->pid, ret); | |
1654 | } else { | |
3757b385 DG |
1655 | /* |
1656 | * This is normal behavior, an application can die during the | |
1657 | * creation process. Don't report an error so the execution can | |
1658 | * continue normally. | |
1659 | */ | |
1660 | ret = 0; | |
ffe60014 DG |
1661 | DBG3("UST app create event failed. Application is dead."); |
1662 | } | |
5b4a0ec0 | 1663 | goto error; |
91d76f53 | 1664 | } |
f6a9efaa | 1665 | |
5b4a0ec0 | 1666 | ua_event->handle = ua_event->obj->handle; |
284d8f55 | 1667 | |
5b4a0ec0 | 1668 | DBG2("UST app event %s created successfully for pid:%d", |
852d0037 | 1669 | ua_event->attr.name, app->pid); |
f6a9efaa | 1670 | |
840cb59c | 1671 | health_code_update(); |
86acf0da | 1672 | |
025faf73 DG |
1673 | /* Set filter if one is present. */ |
1674 | if (ua_event->filter) { | |
1675 | ret = set_ust_event_filter(ua_event, app); | |
1676 | if (ret < 0) { | |
1677 | goto error; | |
1678 | } | |
1679 | } | |
1680 | ||
7cc9a73c JI |
1681 | /* Set exclusions for the event */ |
1682 | if (ua_event->exclusion) { | |
1683 | ret = set_ust_event_exclusion(ua_event, app); | |
1684 | if (ret < 0) { | |
1685 | goto error; | |
1686 | } | |
1687 | } | |
1688 | ||
8535a6d9 | 1689 | /* If event not enabled, disable it on the tracer */ |
40113787 MD |
1690 | if (ua_event->enabled) { |
1691 | /* | |
1692 | * We now need to explicitly enable the event, since it | |
1693 | * is now disabled at creation. | |
1694 | */ | |
1695 | ret = enable_ust_event(app, ua_sess, ua_event); | |
1696 | if (ret < 0) { | |
1697 | /* | |
1698 | * If we hit an EPERM, something is wrong with our enable call. If | |
1699 | * we get an EEXIST, there is a problem on the tracer side since we | |
1700 | * just created it. | |
1701 | */ | |
1702 | switch (ret) { | |
1703 | case -LTTNG_UST_ERR_PERM: | |
1704 | /* Code flow problem */ | |
1705 | assert(0); | |
1706 | case -LTTNG_UST_ERR_EXIST: | |
1707 | /* It's OK for our use case. */ | |
1708 | ret = 0; | |
1709 | break; | |
1710 | default: | |
1711 | break; | |
1712 | } | |
1713 | goto error; | |
1714 | } | |
8535a6d9 DG |
1715 | } |
1716 | ||
5b4a0ec0 | 1717 | error: |
840cb59c | 1718 | health_code_update(); |
5b4a0ec0 | 1719 | return ret; |
91d76f53 | 1720 | } |
48842b30 | 1721 | |
5b4a0ec0 DG |
1722 | /* |
1723 | * Copy data between an UST app event and a LTT event. | |
1724 | */ | |
421cb601 | 1725 | static void shadow_copy_event(struct ust_app_event *ua_event, |
48842b30 DG |
1726 | struct ltt_ust_event *uevent) |
1727 | { | |
b4ffad32 JI |
1728 | size_t exclusion_alloc_size; |
1729 | ||
48842b30 DG |
1730 | strncpy(ua_event->name, uevent->attr.name, sizeof(ua_event->name)); |
1731 | ua_event->name[sizeof(ua_event->name) - 1] = '\0'; | |
1732 | ||
fc34caaa DG |
1733 | ua_event->enabled = uevent->enabled; |
1734 | ||
5b4a0ec0 DG |
1735 | /* Copy event attributes */ |
1736 | memcpy(&ua_event->attr, &uevent->attr, sizeof(ua_event->attr)); | |
1737 | ||
53a80697 MD |
1738 | /* Copy filter bytecode */ |
1739 | if (uevent->filter) { | |
51755dc8 | 1740 | ua_event->filter = copy_filter_bytecode(uevent->filter); |
025faf73 | 1741 | /* Filter might be NULL here in case of ENONEM. */ |
53a80697 | 1742 | } |
b4ffad32 JI |
1743 | |
1744 | /* Copy exclusion data */ | |
1745 | if (uevent->exclusion) { | |
51755dc8 | 1746 | exclusion_alloc_size = sizeof(struct lttng_event_exclusion) + |
b4ffad32 JI |
1747 | LTTNG_UST_SYM_NAME_LEN * uevent->exclusion->count; |
1748 | ua_event->exclusion = zmalloc(exclusion_alloc_size); | |
5f8df26c JI |
1749 | if (ua_event->exclusion == NULL) { |
1750 | PERROR("malloc"); | |
1751 | } else { | |
1752 | memcpy(ua_event->exclusion, uevent->exclusion, | |
1753 | exclusion_alloc_size); | |
b4ffad32 JI |
1754 | } |
1755 | } | |
48842b30 DG |
1756 | } |
1757 | ||
5b4a0ec0 DG |
1758 | /* |
1759 | * Copy data between an UST app channel and a LTT channel. | |
1760 | */ | |
421cb601 | 1761 | static void shadow_copy_channel(struct ust_app_channel *ua_chan, |
48842b30 DG |
1762 | struct ltt_ust_channel *uchan) |
1763 | { | |
bec39940 | 1764 | struct lttng_ht_iter iter; |
48842b30 | 1765 | struct ltt_ust_event *uevent; |
55cc08a6 | 1766 | struct ltt_ust_context *uctx; |
48842b30 DG |
1767 | struct ust_app_event *ua_event; |
1768 | ||
fc34caaa | 1769 | DBG2("UST app shadow copy of channel %s started", ua_chan->name); |
48842b30 DG |
1770 | |
1771 | strncpy(ua_chan->name, uchan->name, sizeof(ua_chan->name)); | |
1772 | ua_chan->name[sizeof(ua_chan->name) - 1] = '\0'; | |
ffe60014 | 1773 | |
1624d5b7 JD |
1774 | ua_chan->tracefile_size = uchan->tracefile_size; |
1775 | ua_chan->tracefile_count = uchan->tracefile_count; | |
1776 | ||
ffe60014 DG |
1777 | /* Copy event attributes since the layout is different. */ |
1778 | ua_chan->attr.subbuf_size = uchan->attr.subbuf_size; | |
1779 | ua_chan->attr.num_subbuf = uchan->attr.num_subbuf; | |
1780 | ua_chan->attr.overwrite = uchan->attr.overwrite; | |
1781 | ua_chan->attr.switch_timer_interval = uchan->attr.switch_timer_interval; | |
1782 | ua_chan->attr.read_timer_interval = uchan->attr.read_timer_interval; | |
1783 | ua_chan->attr.output = uchan->attr.output; | |
1784 | /* | |
1785 | * Note that the attribute channel type is not set since the channel on the | |
1786 | * tracing registry side does not have this information. | |
1787 | */ | |
48842b30 | 1788 | |
fc34caaa | 1789 | ua_chan->enabled = uchan->enabled; |
7972aab2 | 1790 | ua_chan->tracing_channel_id = uchan->id; |
fc34caaa | 1791 | |
31746f93 | 1792 | cds_list_for_each_entry(uctx, &uchan->ctx_list, list) { |
bdf64013 JG |
1793 | struct ust_app_ctx *ua_ctx = alloc_ust_app_ctx(&uctx->ctx); |
1794 | ||
55cc08a6 DG |
1795 | if (ua_ctx == NULL) { |
1796 | continue; | |
1797 | } | |
bec39940 DG |
1798 | lttng_ht_node_init_ulong(&ua_ctx->node, |
1799 | (unsigned long) ua_ctx->ctx.ctx); | |
aa3514e9 | 1800 | lttng_ht_add_ulong(ua_chan->ctx, &ua_ctx->node); |
31746f93 | 1801 | cds_list_add_tail(&ua_ctx->list, &ua_chan->ctx_list); |
55cc08a6 | 1802 | } |
48842b30 | 1803 | |
421cb601 | 1804 | /* Copy all events from ltt ust channel to ust app channel */ |
bec39940 | 1805 | cds_lfht_for_each_entry(uchan->events->ht, &iter.iter, uevent, node.node) { |
18eace3b | 1806 | ua_event = find_ust_app_event(ua_chan->events, uevent->attr.name, |
39c5a3a7 | 1807 | uevent->filter, uevent->attr.loglevel, uevent->exclusion); |
18eace3b | 1808 | if (ua_event == NULL) { |
421cb601 | 1809 | DBG2("UST event %s not found on shadow copy channel", |
48842b30 | 1810 | uevent->attr.name); |
284d8f55 | 1811 | ua_event = alloc_ust_app_event(uevent->attr.name, &uevent->attr); |
48842b30 | 1812 | if (ua_event == NULL) { |
5b4a0ec0 | 1813 | continue; |
48842b30 | 1814 | } |
421cb601 | 1815 | shadow_copy_event(ua_event, uevent); |
d0b96690 | 1816 | add_unique_ust_app_event(ua_chan, ua_event); |
48842b30 | 1817 | } |
48842b30 DG |
1818 | } |
1819 | ||
fc34caaa | 1820 | DBG3("UST app shadow copy of channel %s done", ua_chan->name); |
48842b30 DG |
1821 | } |
1822 | ||
5b4a0ec0 DG |
1823 | /* |
1824 | * Copy data between a UST app session and a regular LTT session. | |
1825 | */ | |
421cb601 | 1826 | static void shadow_copy_session(struct ust_app_session *ua_sess, |
bec39940 | 1827 | struct ltt_ust_session *usess, struct ust_app *app) |
48842b30 | 1828 | { |
bec39940 DG |
1829 | struct lttng_ht_node_str *ua_chan_node; |
1830 | struct lttng_ht_iter iter; | |
48842b30 DG |
1831 | struct ltt_ust_channel *uchan; |
1832 | struct ust_app_channel *ua_chan; | |
477d7741 MD |
1833 | time_t rawtime; |
1834 | struct tm *timeinfo; | |
1835 | char datetime[16]; | |
1836 | int ret; | |
d7ba1388 | 1837 | char tmp_shm_path[PATH_MAX]; |
477d7741 MD |
1838 | |
1839 | /* Get date and time for unique app path */ | |
1840 | time(&rawtime); | |
1841 | timeinfo = localtime(&rawtime); | |
1842 | strftime(datetime, sizeof(datetime), "%Y%m%d-%H%M%S", timeinfo); | |
48842b30 | 1843 | |
421cb601 | 1844 | DBG2("Shadow copy of session handle %d", ua_sess->handle); |
48842b30 | 1845 | |
7972aab2 DG |
1846 | ua_sess->tracing_id = usess->id; |
1847 | ua_sess->id = get_next_session_id(); | |
1848 | ua_sess->uid = app->uid; | |
1849 | ua_sess->gid = app->gid; | |
1850 | ua_sess->euid = usess->uid; | |
1851 | ua_sess->egid = usess->gid; | |
1852 | ua_sess->buffer_type = usess->buffer_type; | |
1853 | ua_sess->bits_per_long = app->bits_per_long; | |
6addfa37 | 1854 | |
7972aab2 | 1855 | /* There is only one consumer object per session possible. */ |
6addfa37 | 1856 | consumer_output_get(usess->consumer); |
7972aab2 | 1857 | ua_sess->consumer = usess->consumer; |
6addfa37 | 1858 | |
2bba9e53 | 1859 | ua_sess->output_traces = usess->output_traces; |
ecc48a90 | 1860 | ua_sess->live_timer_interval = usess->live_timer_interval; |
84ad93e8 DG |
1861 | copy_channel_attr_to_ustctl(&ua_sess->metadata_attr, |
1862 | &usess->metadata_attr); | |
7972aab2 DG |
1863 | |
1864 | switch (ua_sess->buffer_type) { | |
1865 | case LTTNG_BUFFER_PER_PID: | |
1866 | ret = snprintf(ua_sess->path, sizeof(ua_sess->path), | |
dec56f6c | 1867 | DEFAULT_UST_TRACE_PID_PATH "/%s-%d-%s", app->name, app->pid, |
7972aab2 DG |
1868 | datetime); |
1869 | break; | |
1870 | case LTTNG_BUFFER_PER_UID: | |
1871 | ret = snprintf(ua_sess->path, sizeof(ua_sess->path), | |
1872 | DEFAULT_UST_TRACE_UID_PATH, ua_sess->uid, app->bits_per_long); | |
1873 | break; | |
1874 | default: | |
1875 | assert(0); | |
1876 | goto error; | |
1877 | } | |
477d7741 MD |
1878 | if (ret < 0) { |
1879 | PERROR("asprintf UST shadow copy session"); | |
477d7741 | 1880 | assert(0); |
7972aab2 | 1881 | goto error; |
477d7741 MD |
1882 | } |
1883 | ||
3d071855 MD |
1884 | strncpy(ua_sess->root_shm_path, usess->root_shm_path, |
1885 | sizeof(ua_sess->root_shm_path)); | |
1886 | ua_sess->root_shm_path[sizeof(ua_sess->root_shm_path) - 1] = '\0'; | |
d7ba1388 MD |
1887 | strncpy(ua_sess->shm_path, usess->shm_path, |
1888 | sizeof(ua_sess->shm_path)); | |
1889 | ua_sess->shm_path[sizeof(ua_sess->shm_path) - 1] = '\0'; | |
1890 | if (ua_sess->shm_path[0]) { | |
1891 | switch (ua_sess->buffer_type) { | |
1892 | case LTTNG_BUFFER_PER_PID: | |
1893 | ret = snprintf(tmp_shm_path, sizeof(tmp_shm_path), | |
1894 | DEFAULT_UST_TRACE_PID_PATH "/%s-%d-%s", | |
1895 | app->name, app->pid, datetime); | |
1896 | break; | |
1897 | case LTTNG_BUFFER_PER_UID: | |
1898 | ret = snprintf(tmp_shm_path, sizeof(tmp_shm_path), | |
1899 | DEFAULT_UST_TRACE_UID_PATH, | |
1900 | app->uid, app->bits_per_long); | |
1901 | break; | |
1902 | default: | |
1903 | assert(0); | |
1904 | goto error; | |
1905 | } | |
1906 | if (ret < 0) { | |
1907 | PERROR("sprintf UST shadow copy session"); | |
1908 | assert(0); | |
1909 | goto error; | |
1910 | } | |
1911 | strncat(ua_sess->shm_path, tmp_shm_path, | |
1912 | sizeof(ua_sess->shm_path) - strlen(ua_sess->shm_path) - 1); | |
1913 | ua_sess->shm_path[sizeof(ua_sess->shm_path) - 1] = '\0'; | |
1914 | } | |
1915 | ||
48842b30 | 1916 | /* Iterate over all channels in global domain. */ |
bec39940 DG |
1917 | cds_lfht_for_each_entry(usess->domain_global.channels->ht, &iter.iter, |
1918 | uchan, node.node) { | |
1919 | struct lttng_ht_iter uiter; | |
ba767faf | 1920 | |
bec39940 DG |
1921 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter); |
1922 | ua_chan_node = lttng_ht_iter_get_node_str(&uiter); | |
5b4a0ec0 | 1923 | if (ua_chan_node != NULL) { |
fc34caaa | 1924 | /* Session exist. Contiuing. */ |
5b4a0ec0 DG |
1925 | continue; |
1926 | } | |
421cb601 | 1927 | |
5b4a0ec0 DG |
1928 | DBG2("Channel %s not found on shadow session copy, creating it", |
1929 | uchan->name); | |
fb83fe64 JD |
1930 | ua_chan = alloc_ust_app_channel(uchan->name, ua_sess, |
1931 | &uchan->attr); | |
5b4a0ec0 | 1932 | if (ua_chan == NULL) { |
fc34caaa | 1933 | /* malloc failed FIXME: Might want to do handle ENOMEM .. */ |
5b4a0ec0 | 1934 | continue; |
48842b30 | 1935 | } |
5b4a0ec0 | 1936 | shadow_copy_channel(ua_chan, uchan); |
ffe60014 DG |
1937 | /* |
1938 | * The concept of metadata channel does not exist on the tracing | |
1939 | * registry side of the session daemon so this can only be a per CPU | |
1940 | * channel and not metadata. | |
1941 | */ | |
1942 | ua_chan->attr.type = LTTNG_UST_CHAN_PER_CPU; | |
1943 | ||
bec39940 | 1944 | lttng_ht_add_unique_str(ua_sess->channels, &ua_chan->node); |
48842b30 | 1945 | } |
6addfa37 | 1946 | return; |
7972aab2 DG |
1947 | |
1948 | error: | |
6addfa37 | 1949 | consumer_output_put(ua_sess->consumer); |
48842b30 DG |
1950 | } |
1951 | ||
78f0bacd DG |
1952 | /* |
1953 | * Lookup sesison wrapper. | |
1954 | */ | |
84cd17c6 MD |
1955 | static |
1956 | void __lookup_session_by_app(struct ltt_ust_session *usess, | |
bec39940 | 1957 | struct ust_app *app, struct lttng_ht_iter *iter) |
84cd17c6 MD |
1958 | { |
1959 | /* Get right UST app session from app */ | |
d9bf3ca4 | 1960 | lttng_ht_lookup(app->sessions, &usess->id, iter); |
84cd17c6 MD |
1961 | } |
1962 | ||
421cb601 DG |
1963 | /* |
1964 | * Return ust app session from the app session hashtable using the UST session | |
a991f516 | 1965 | * id. |
421cb601 | 1966 | */ |
48842b30 DG |
1967 | static struct ust_app_session *lookup_session_by_app( |
1968 | struct ltt_ust_session *usess, struct ust_app *app) | |
1969 | { | |
bec39940 | 1970 | struct lttng_ht_iter iter; |
d9bf3ca4 | 1971 | struct lttng_ht_node_u64 *node; |
48842b30 | 1972 | |
84cd17c6 | 1973 | __lookup_session_by_app(usess, app, &iter); |
d9bf3ca4 | 1974 | node = lttng_ht_iter_get_node_u64(&iter); |
48842b30 DG |
1975 | if (node == NULL) { |
1976 | goto error; | |
1977 | } | |
1978 | ||
1979 | return caa_container_of(node, struct ust_app_session, node); | |
1980 | ||
1981 | error: | |
1982 | return NULL; | |
1983 | } | |
1984 | ||
7972aab2 DG |
1985 | /* |
1986 | * Setup buffer registry per PID for the given session and application. If none | |
1987 | * is found, a new one is created, added to the global registry and | |
1988 | * initialized. If regp is valid, it's set with the newly created object. | |
1989 | * | |
1990 | * Return 0 on success or else a negative value. | |
1991 | */ | |
1992 | static int setup_buffer_reg_pid(struct ust_app_session *ua_sess, | |
1993 | struct ust_app *app, struct buffer_reg_pid **regp) | |
1994 | { | |
1995 | int ret = 0; | |
1996 | struct buffer_reg_pid *reg_pid; | |
1997 | ||
1998 | assert(ua_sess); | |
1999 | assert(app); | |
2000 | ||
2001 | rcu_read_lock(); | |
2002 | ||
2003 | reg_pid = buffer_reg_pid_find(ua_sess->id); | |
2004 | if (!reg_pid) { | |
2005 | /* | |
2006 | * This is the create channel path meaning that if there is NO | |
2007 | * registry available, we have to create one for this session. | |
2008 | */ | |
d7ba1388 | 2009 | ret = buffer_reg_pid_create(ua_sess->id, ®_pid, |
3d071855 | 2010 | ua_sess->root_shm_path, ua_sess->shm_path); |
7972aab2 DG |
2011 | if (ret < 0) { |
2012 | goto error; | |
2013 | } | |
7972aab2 DG |
2014 | } else { |
2015 | goto end; | |
2016 | } | |
2017 | ||
2018 | /* Initialize registry. */ | |
2019 | ret = ust_registry_session_init(®_pid->registry->reg.ust, app, | |
2020 | app->bits_per_long, app->uint8_t_alignment, | |
2021 | app->uint16_t_alignment, app->uint32_t_alignment, | |
af6142cf MD |
2022 | app->uint64_t_alignment, app->long_alignment, |
2023 | app->byte_order, app->version.major, | |
3d071855 MD |
2024 | app->version.minor, reg_pid->root_shm_path, |
2025 | reg_pid->shm_path, | |
d7ba1388 | 2026 | ua_sess->euid, ua_sess->egid); |
7972aab2 | 2027 | if (ret < 0) { |
286c991a MD |
2028 | /* |
2029 | * reg_pid->registry->reg.ust is NULL upon error, so we need to | |
2030 | * destroy the buffer registry, because it is always expected | |
2031 | * that if the buffer registry can be found, its ust registry is | |
2032 | * non-NULL. | |
2033 | */ | |
2034 | buffer_reg_pid_destroy(reg_pid); | |
7972aab2 DG |
2035 | goto error; |
2036 | } | |
2037 | ||
286c991a MD |
2038 | buffer_reg_pid_add(reg_pid); |
2039 | ||
7972aab2 DG |
2040 | DBG3("UST app buffer registry per PID created successfully"); |
2041 | ||
2042 | end: | |
2043 | if (regp) { | |
2044 | *regp = reg_pid; | |
2045 | } | |
2046 | error: | |
2047 | rcu_read_unlock(); | |
2048 | return ret; | |
2049 | } | |
2050 | ||
2051 | /* | |
2052 | * Setup buffer registry per UID for the given session and application. If none | |
2053 | * is found, a new one is created, added to the global registry and | |
2054 | * initialized. If regp is valid, it's set with the newly created object. | |
2055 | * | |
2056 | * Return 0 on success or else a negative value. | |
2057 | */ | |
2058 | static int setup_buffer_reg_uid(struct ltt_ust_session *usess, | |
d7ba1388 | 2059 | struct ust_app_session *ua_sess, |
7972aab2 DG |
2060 | struct ust_app *app, struct buffer_reg_uid **regp) |
2061 | { | |
2062 | int ret = 0; | |
2063 | struct buffer_reg_uid *reg_uid; | |
2064 | ||
2065 | assert(usess); | |
2066 | assert(app); | |
2067 | ||
2068 | rcu_read_lock(); | |
2069 | ||
2070 | reg_uid = buffer_reg_uid_find(usess->id, app->bits_per_long, app->uid); | |
2071 | if (!reg_uid) { | |
2072 | /* | |
2073 | * This is the create channel path meaning that if there is NO | |
2074 | * registry available, we have to create one for this session. | |
2075 | */ | |
2076 | ret = buffer_reg_uid_create(usess->id, app->bits_per_long, app->uid, | |
3d071855 MD |
2077 | LTTNG_DOMAIN_UST, ®_uid, |
2078 | ua_sess->root_shm_path, ua_sess->shm_path); | |
7972aab2 DG |
2079 | if (ret < 0) { |
2080 | goto error; | |
2081 | } | |
7972aab2 DG |
2082 | } else { |
2083 | goto end; | |
2084 | } | |
2085 | ||
2086 | /* Initialize registry. */ | |
af6142cf | 2087 | ret = ust_registry_session_init(®_uid->registry->reg.ust, NULL, |
7972aab2 DG |
2088 | app->bits_per_long, app->uint8_t_alignment, |
2089 | app->uint16_t_alignment, app->uint32_t_alignment, | |
af6142cf MD |
2090 | app->uint64_t_alignment, app->long_alignment, |
2091 | app->byte_order, app->version.major, | |
3d071855 MD |
2092 | app->version.minor, reg_uid->root_shm_path, |
2093 | reg_uid->shm_path, usess->uid, usess->gid); | |
7972aab2 | 2094 | if (ret < 0) { |
286c991a MD |
2095 | /* |
2096 | * reg_uid->registry->reg.ust is NULL upon error, so we need to | |
2097 | * destroy the buffer registry, because it is always expected | |
2098 | * that if the buffer registry can be found, its ust registry is | |
2099 | * non-NULL. | |
2100 | */ | |
2101 | buffer_reg_uid_destroy(reg_uid, NULL); | |
7972aab2 DG |
2102 | goto error; |
2103 | } | |
2104 | /* Add node to teardown list of the session. */ | |
2105 | cds_list_add(®_uid->lnode, &usess->buffer_reg_uid_list); | |
2106 | ||
286c991a | 2107 | buffer_reg_uid_add(reg_uid); |
7972aab2 | 2108 | |
286c991a | 2109 | DBG3("UST app buffer registry per UID created successfully"); |
7972aab2 DG |
2110 | end: |
2111 | if (regp) { | |
2112 | *regp = reg_uid; | |
2113 | } | |
2114 | error: | |
2115 | rcu_read_unlock(); | |
2116 | return ret; | |
2117 | } | |
2118 | ||
421cb601 | 2119 | /* |
3d8ca23b | 2120 | * Create a session on the tracer side for the given app. |
421cb601 | 2121 | * |
3d8ca23b DG |
2122 | * On success, ua_sess_ptr is populated with the session pointer or else left |
2123 | * untouched. If the session was created, is_created is set to 1. On error, | |
2124 | * it's left untouched. Note that ua_sess_ptr is mandatory but is_created can | |
2125 | * be NULL. | |
2126 | * | |
2127 | * Returns 0 on success or else a negative code which is either -ENOMEM or | |
2128 | * -ENOTCONN which is the default code if the ustctl_create_session fails. | |
421cb601 | 2129 | */ |
3d8ca23b DG |
2130 | static int create_ust_app_session(struct ltt_ust_session *usess, |
2131 | struct ust_app *app, struct ust_app_session **ua_sess_ptr, | |
2132 | int *is_created) | |
421cb601 | 2133 | { |
3d8ca23b | 2134 | int ret, created = 0; |
421cb601 DG |
2135 | struct ust_app_session *ua_sess; |
2136 | ||
3d8ca23b DG |
2137 | assert(usess); |
2138 | assert(app); | |
2139 | assert(ua_sess_ptr); | |
2140 | ||
840cb59c | 2141 | health_code_update(); |
86acf0da | 2142 | |
421cb601 DG |
2143 | ua_sess = lookup_session_by_app(usess, app); |
2144 | if (ua_sess == NULL) { | |
d9bf3ca4 | 2145 | DBG2("UST app pid: %d session id %" PRIu64 " not found, creating it", |
852d0037 | 2146 | app->pid, usess->id); |
d0b96690 | 2147 | ua_sess = alloc_ust_app_session(app); |
421cb601 DG |
2148 | if (ua_sess == NULL) { |
2149 | /* Only malloc can failed so something is really wrong */ | |
3d8ca23b DG |
2150 | ret = -ENOMEM; |
2151 | goto error; | |
421cb601 | 2152 | } |
477d7741 | 2153 | shadow_copy_session(ua_sess, usess, app); |
3d8ca23b | 2154 | created = 1; |
421cb601 DG |
2155 | } |
2156 | ||
7972aab2 DG |
2157 | switch (usess->buffer_type) { |
2158 | case LTTNG_BUFFER_PER_PID: | |
2159 | /* Init local registry. */ | |
2160 | ret = setup_buffer_reg_pid(ua_sess, app, NULL); | |
421cb601 | 2161 | if (ret < 0) { |
e64207cf | 2162 | delete_ust_app_session(-1, ua_sess, app); |
7972aab2 DG |
2163 | goto error; |
2164 | } | |
2165 | break; | |
2166 | case LTTNG_BUFFER_PER_UID: | |
2167 | /* Look for a global registry. If none exists, create one. */ | |
d7ba1388 | 2168 | ret = setup_buffer_reg_uid(usess, ua_sess, app, NULL); |
7972aab2 | 2169 | if (ret < 0) { |
e64207cf | 2170 | delete_ust_app_session(-1, ua_sess, app); |
7972aab2 DG |
2171 | goto error; |
2172 | } | |
2173 | break; | |
2174 | default: | |
2175 | assert(0); | |
2176 | ret = -EINVAL; | |
2177 | goto error; | |
2178 | } | |
2179 | ||
2180 | health_code_update(); | |
2181 | ||
2182 | if (ua_sess->handle == -1) { | |
fb45065e | 2183 | pthread_mutex_lock(&app->sock_lock); |
7972aab2 | 2184 | ret = ustctl_create_session(app->sock); |
fb45065e | 2185 | pthread_mutex_unlock(&app->sock_lock); |
7972aab2 DG |
2186 | if (ret < 0) { |
2187 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
2188 | ERR("Creating session for app pid %d with ret %d", | |
ffe60014 DG |
2189 | app->pid, ret); |
2190 | } else { | |
2191 | DBG("UST app creating session failed. Application is dead"); | |
3757b385 DG |
2192 | /* |
2193 | * This is normal behavior, an application can die during the | |
2194 | * creation process. Don't report an error so the execution can | |
2195 | * continue normally. This will get flagged ENOTCONN and the | |
2196 | * caller will handle it. | |
2197 | */ | |
2198 | ret = 0; | |
ffe60014 | 2199 | } |
d0b96690 | 2200 | delete_ust_app_session(-1, ua_sess, app); |
3d8ca23b DG |
2201 | if (ret != -ENOMEM) { |
2202 | /* | |
2203 | * Tracer is probably gone or got an internal error so let's | |
2204 | * behave like it will soon unregister or not usable. | |
2205 | */ | |
2206 | ret = -ENOTCONN; | |
2207 | } | |
2208 | goto error; | |
421cb601 DG |
2209 | } |
2210 | ||
7972aab2 DG |
2211 | ua_sess->handle = ret; |
2212 | ||
2213 | /* Add ust app session to app's HT */ | |
d9bf3ca4 MD |
2214 | lttng_ht_node_init_u64(&ua_sess->node, |
2215 | ua_sess->tracing_id); | |
2216 | lttng_ht_add_unique_u64(app->sessions, &ua_sess->node); | |
10b56aef MD |
2217 | lttng_ht_node_init_ulong(&ua_sess->ust_objd_node, ua_sess->handle); |
2218 | lttng_ht_add_unique_ulong(app->ust_sessions_objd, | |
2219 | &ua_sess->ust_objd_node); | |
7972aab2 DG |
2220 | |
2221 | DBG2("UST app session created successfully with handle %d", ret); | |
2222 | } | |
2223 | ||
2224 | *ua_sess_ptr = ua_sess; | |
2225 | if (is_created) { | |
2226 | *is_created = created; | |
2227 | } | |
2228 | ||
2229 | /* Everything went well. */ | |
2230 | ret = 0; | |
2231 | ||
2232 | error: | |
2233 | health_code_update(); | |
2234 | return ret; | |
2235 | } | |
2236 | ||
6a6b2068 JG |
2237 | /* |
2238 | * Match function for a hash table lookup of ust_app_ctx. | |
2239 | * | |
2240 | * It matches an ust app context based on the context type and, in the case | |
2241 | * of perf counters, their name. | |
2242 | */ | |
2243 | static int ht_match_ust_app_ctx(struct cds_lfht_node *node, const void *_key) | |
2244 | { | |
2245 | struct ust_app_ctx *ctx; | |
bdf64013 | 2246 | const struct lttng_ust_context_attr *key; |
6a6b2068 JG |
2247 | |
2248 | assert(node); | |
2249 | assert(_key); | |
2250 | ||
2251 | ctx = caa_container_of(node, struct ust_app_ctx, node.node); | |
2252 | key = _key; | |
2253 | ||
2254 | /* Context type */ | |
2255 | if (ctx->ctx.ctx != key->ctx) { | |
2256 | goto no_match; | |
2257 | } | |
2258 | ||
bdf64013 JG |
2259 | switch(key->ctx) { |
2260 | case LTTNG_UST_CONTEXT_PERF_THREAD_COUNTER: | |
6a6b2068 | 2261 | if (strncmp(key->u.perf_counter.name, |
bdf64013 JG |
2262 | ctx->ctx.u.perf_counter.name, |
2263 | sizeof(key->u.perf_counter.name))) { | |
2264 | goto no_match; | |
2265 | } | |
2266 | break; | |
2267 | case LTTNG_UST_CONTEXT_APP_CONTEXT: | |
2268 | if (strcmp(key->u.app_ctx.provider_name, | |
2269 | ctx->ctx.u.app_ctx.provider_name) || | |
2270 | strcmp(key->u.app_ctx.ctx_name, | |
2271 | ctx->ctx.u.app_ctx.ctx_name)) { | |
6a6b2068 JG |
2272 | goto no_match; |
2273 | } | |
bdf64013 JG |
2274 | break; |
2275 | default: | |
2276 | break; | |
6a6b2068 JG |
2277 | } |
2278 | ||
2279 | /* Match. */ | |
2280 | return 1; | |
2281 | ||
2282 | no_match: | |
2283 | return 0; | |
2284 | } | |
2285 | ||
2286 | /* | |
2287 | * Lookup for an ust app context from an lttng_ust_context. | |
2288 | * | |
be184a0f | 2289 | * Must be called while holding RCU read side lock. |
6a6b2068 JG |
2290 | * Return an ust_app_ctx object or NULL on error. |
2291 | */ | |
2292 | static | |
2293 | struct ust_app_ctx *find_ust_app_context(struct lttng_ht *ht, | |
bdf64013 | 2294 | struct lttng_ust_context_attr *uctx) |
6a6b2068 JG |
2295 | { |
2296 | struct lttng_ht_iter iter; | |
2297 | struct lttng_ht_node_ulong *node; | |
2298 | struct ust_app_ctx *app_ctx = NULL; | |
2299 | ||
2300 | assert(uctx); | |
2301 | assert(ht); | |
2302 | ||
2303 | /* Lookup using the lttng_ust_context_type and a custom match fct. */ | |
2304 | cds_lfht_lookup(ht->ht, ht->hash_fct((void *) uctx->ctx, lttng_ht_seed), | |
2305 | ht_match_ust_app_ctx, uctx, &iter.iter); | |
2306 | node = lttng_ht_iter_get_node_ulong(&iter); | |
2307 | if (!node) { | |
2308 | goto end; | |
2309 | } | |
2310 | ||
2311 | app_ctx = caa_container_of(node, struct ust_app_ctx, node); | |
2312 | ||
2313 | end: | |
2314 | return app_ctx; | |
2315 | } | |
2316 | ||
7972aab2 DG |
2317 | /* |
2318 | * Create a context for the channel on the tracer. | |
2319 | * | |
2320 | * Called with UST app session lock held and a RCU read side lock. | |
2321 | */ | |
2322 | static | |
2323 | int create_ust_app_channel_context(struct ust_app_session *ua_sess, | |
bdf64013 JG |
2324 | struct ust_app_channel *ua_chan, |
2325 | struct lttng_ust_context_attr *uctx, | |
7972aab2 DG |
2326 | struct ust_app *app) |
2327 | { | |
2328 | int ret = 0; | |
7972aab2 DG |
2329 | struct ust_app_ctx *ua_ctx; |
2330 | ||
2331 | DBG2("UST app adding context to channel %s", ua_chan->name); | |
2332 | ||
6a6b2068 JG |
2333 | ua_ctx = find_ust_app_context(ua_chan->ctx, uctx); |
2334 | if (ua_ctx) { | |
7972aab2 DG |
2335 | ret = -EEXIST; |
2336 | goto error; | |
2337 | } | |
2338 | ||
2339 | ua_ctx = alloc_ust_app_ctx(uctx); | |
2340 | if (ua_ctx == NULL) { | |
2341 | /* malloc failed */ | |
2342 | ret = -1; | |
2343 | goto error; | |
2344 | } | |
2345 | ||
2346 | lttng_ht_node_init_ulong(&ua_ctx->node, (unsigned long) ua_ctx->ctx.ctx); | |
aa3514e9 | 2347 | lttng_ht_add_ulong(ua_chan->ctx, &ua_ctx->node); |
31746f93 | 2348 | cds_list_add_tail(&ua_ctx->list, &ua_chan->ctx_list); |
7972aab2 DG |
2349 | |
2350 | ret = create_ust_channel_context(ua_chan, ua_ctx, app); | |
2351 | if (ret < 0) { | |
2352 | goto error; | |
2353 | } | |
2354 | ||
2355 | error: | |
2356 | return ret; | |
2357 | } | |
2358 | ||
2359 | /* | |
2360 | * Enable on the tracer side a ust app event for the session and channel. | |
2361 | * | |
2362 | * Called with UST app session lock held. | |
2363 | */ | |
2364 | static | |
2365 | int enable_ust_app_event(struct ust_app_session *ua_sess, | |
2366 | struct ust_app_event *ua_event, struct ust_app *app) | |
2367 | { | |
2368 | int ret; | |
2369 | ||
2370 | ret = enable_ust_event(app, ua_sess, ua_event); | |
2371 | if (ret < 0) { | |
2372 | goto error; | |
2373 | } | |
2374 | ||
2375 | ua_event->enabled = 1; | |
2376 | ||
2377 | error: | |
2378 | return ret; | |
2379 | } | |
2380 | ||
2381 | /* | |
2382 | * Disable on the tracer side a ust app event for the session and channel. | |
2383 | */ | |
2384 | static int disable_ust_app_event(struct ust_app_session *ua_sess, | |
2385 | struct ust_app_event *ua_event, struct ust_app *app) | |
2386 | { | |
2387 | int ret; | |
2388 | ||
2389 | ret = disable_ust_event(app, ua_sess, ua_event); | |
2390 | if (ret < 0) { | |
2391 | goto error; | |
2392 | } | |
2393 | ||
2394 | ua_event->enabled = 0; | |
2395 | ||
2396 | error: | |
2397 | return ret; | |
2398 | } | |
2399 | ||
2400 | /* | |
2401 | * Lookup ust app channel for session and disable it on the tracer side. | |
2402 | */ | |
2403 | static | |
2404 | int disable_ust_app_channel(struct ust_app_session *ua_sess, | |
2405 | struct ust_app_channel *ua_chan, struct ust_app *app) | |
2406 | { | |
2407 | int ret; | |
2408 | ||
2409 | ret = disable_ust_channel(app, ua_sess, ua_chan); | |
2410 | if (ret < 0) { | |
2411 | goto error; | |
2412 | } | |
2413 | ||
2414 | ua_chan->enabled = 0; | |
2415 | ||
2416 | error: | |
2417 | return ret; | |
2418 | } | |
2419 | ||
2420 | /* | |
2421 | * Lookup ust app channel for session and enable it on the tracer side. This | |
2422 | * MUST be called with a RCU read side lock acquired. | |
2423 | */ | |
2424 | static int enable_ust_app_channel(struct ust_app_session *ua_sess, | |
2425 | struct ltt_ust_channel *uchan, struct ust_app *app) | |
2426 | { | |
2427 | int ret = 0; | |
2428 | struct lttng_ht_iter iter; | |
2429 | struct lttng_ht_node_str *ua_chan_node; | |
2430 | struct ust_app_channel *ua_chan; | |
2431 | ||
2432 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &iter); | |
2433 | ua_chan_node = lttng_ht_iter_get_node_str(&iter); | |
2434 | if (ua_chan_node == NULL) { | |
d9bf3ca4 | 2435 | DBG2("Unable to find channel %s in ust session id %" PRIu64, |
7972aab2 DG |
2436 | uchan->name, ua_sess->tracing_id); |
2437 | goto error; | |
2438 | } | |
2439 | ||
2440 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); | |
2441 | ||
2442 | ret = enable_ust_channel(app, ua_sess, ua_chan); | |
2443 | if (ret < 0) { | |
2444 | goto error; | |
2445 | } | |
2446 | ||
2447 | error: | |
2448 | return ret; | |
2449 | } | |
2450 | ||
2451 | /* | |
2452 | * Ask the consumer to create a channel and get it if successful. | |
2453 | * | |
2454 | * Return 0 on success or else a negative value. | |
2455 | */ | |
2456 | static int do_consumer_create_channel(struct ltt_ust_session *usess, | |
2457 | struct ust_app_session *ua_sess, struct ust_app_channel *ua_chan, | |
2458 | int bitness, struct ust_registry_session *registry) | |
2459 | { | |
2460 | int ret; | |
2461 | unsigned int nb_fd = 0; | |
2462 | struct consumer_socket *socket; | |
2463 | ||
2464 | assert(usess); | |
2465 | assert(ua_sess); | |
2466 | assert(ua_chan); | |
2467 | assert(registry); | |
2468 | ||
2469 | rcu_read_lock(); | |
2470 | health_code_update(); | |
2471 | ||
2472 | /* Get the right consumer socket for the application. */ | |
2473 | socket = consumer_find_socket_by_bitness(bitness, usess->consumer); | |
2474 | if (!socket) { | |
2475 | ret = -EINVAL; | |
2476 | goto error; | |
2477 | } | |
2478 | ||
2479 | health_code_update(); | |
2480 | ||
2481 | /* Need one fd for the channel. */ | |
2482 | ret = lttng_fd_get(LTTNG_FD_APPS, 1); | |
2483 | if (ret < 0) { | |
2484 | ERR("Exhausted number of available FD upon create channel"); | |
2485 | goto error; | |
2486 | } | |
2487 | ||
2488 | /* | |
2489 | * Ask consumer to create channel. The consumer will return the number of | |
2490 | * stream we have to expect. | |
2491 | */ | |
2492 | ret = ust_consumer_ask_channel(ua_sess, ua_chan, usess->consumer, socket, | |
2493 | registry); | |
2494 | if (ret < 0) { | |
2495 | goto error_ask; | |
2496 | } | |
2497 | ||
2498 | /* | |
2499 | * Compute the number of fd needed before receiving them. It must be 2 per | |
2500 | * stream (2 being the default value here). | |
2501 | */ | |
2502 | nb_fd = DEFAULT_UST_STREAM_FD_NUM * ua_chan->expected_stream_count; | |
2503 | ||
2504 | /* Reserve the amount of file descriptor we need. */ | |
2505 | ret = lttng_fd_get(LTTNG_FD_APPS, nb_fd); | |
2506 | if (ret < 0) { | |
2507 | ERR("Exhausted number of available FD upon create channel"); | |
2508 | goto error_fd_get_stream; | |
2509 | } | |
2510 | ||
2511 | health_code_update(); | |
2512 | ||
2513 | /* | |
2514 | * Now get the channel from the consumer. This call wil populate the stream | |
2515 | * list of that channel and set the ust objects. | |
2516 | */ | |
d9078d0c DG |
2517 | if (usess->consumer->enabled) { |
2518 | ret = ust_consumer_get_channel(socket, ua_chan); | |
2519 | if (ret < 0) { | |
2520 | goto error_destroy; | |
2521 | } | |
7972aab2 DG |
2522 | } |
2523 | ||
2524 | rcu_read_unlock(); | |
2525 | return 0; | |
2526 | ||
2527 | error_destroy: | |
2528 | lttng_fd_put(LTTNG_FD_APPS, nb_fd); | |
2529 | error_fd_get_stream: | |
2530 | /* | |
2531 | * Initiate a destroy channel on the consumer since we had an error | |
2532 | * handling it on our side. The return value is of no importance since we | |
2533 | * already have a ret value set by the previous error that we need to | |
2534 | * return. | |
2535 | */ | |
2536 | (void) ust_consumer_destroy_channel(socket, ua_chan); | |
2537 | error_ask: | |
2538 | lttng_fd_put(LTTNG_FD_APPS, 1); | |
2539 | error: | |
2540 | health_code_update(); | |
2541 | rcu_read_unlock(); | |
2542 | return ret; | |
2543 | } | |
2544 | ||
2545 | /* | |
2546 | * Duplicate the ust data object of the ust app stream and save it in the | |
2547 | * buffer registry stream. | |
2548 | * | |
2549 | * Return 0 on success or else a negative value. | |
2550 | */ | |
2551 | static int duplicate_stream_object(struct buffer_reg_stream *reg_stream, | |
2552 | struct ust_app_stream *stream) | |
2553 | { | |
2554 | int ret; | |
2555 | ||
2556 | assert(reg_stream); | |
2557 | assert(stream); | |
2558 | ||
2559 | /* Reserve the amount of file descriptor we need. */ | |
2560 | ret = lttng_fd_get(LTTNG_FD_APPS, 2); | |
2561 | if (ret < 0) { | |
2562 | ERR("Exhausted number of available FD upon duplicate stream"); | |
2563 | goto error; | |
2564 | } | |
2565 | ||
2566 | /* Duplicate object for stream once the original is in the registry. */ | |
2567 | ret = ustctl_duplicate_ust_object_data(&stream->obj, | |
2568 | reg_stream->obj.ust); | |
2569 | if (ret < 0) { | |
2570 | ERR("Duplicate stream obj from %p to %p failed with ret %d", | |
2571 | reg_stream->obj.ust, stream->obj, ret); | |
2572 | lttng_fd_put(LTTNG_FD_APPS, 2); | |
2573 | goto error; | |
2574 | } | |
2575 | stream->handle = stream->obj->handle; | |
2576 | ||
2577 | error: | |
2578 | return ret; | |
2579 | } | |
2580 | ||
2581 | /* | |
2582 | * Duplicate the ust data object of the ust app. channel and save it in the | |
2583 | * buffer registry channel. | |
2584 | * | |
2585 | * Return 0 on success or else a negative value. | |
2586 | */ | |
2587 | static int duplicate_channel_object(struct buffer_reg_channel *reg_chan, | |
2588 | struct ust_app_channel *ua_chan) | |
2589 | { | |
2590 | int ret; | |
2591 | ||
2592 | assert(reg_chan); | |
2593 | assert(ua_chan); | |
2594 | ||
2595 | /* Need two fds for the channel. */ | |
2596 | ret = lttng_fd_get(LTTNG_FD_APPS, 1); | |
2597 | if (ret < 0) { | |
2598 | ERR("Exhausted number of available FD upon duplicate channel"); | |
2599 | goto error_fd_get; | |
2600 | } | |
2601 | ||
2602 | /* Duplicate object for stream once the original is in the registry. */ | |
2603 | ret = ustctl_duplicate_ust_object_data(&ua_chan->obj, reg_chan->obj.ust); | |
2604 | if (ret < 0) { | |
2605 | ERR("Duplicate channel obj from %p to %p failed with ret: %d", | |
2606 | reg_chan->obj.ust, ua_chan->obj, ret); | |
2607 | goto error; | |
2608 | } | |
2609 | ua_chan->handle = ua_chan->obj->handle; | |
2610 | ||
2611 | return 0; | |
2612 | ||
2613 | error: | |
2614 | lttng_fd_put(LTTNG_FD_APPS, 1); | |
2615 | error_fd_get: | |
2616 | return ret; | |
2617 | } | |
2618 | ||
2619 | /* | |
2620 | * For a given channel buffer registry, setup all streams of the given ust | |
2621 | * application channel. | |
2622 | * | |
2623 | * Return 0 on success or else a negative value. | |
2624 | */ | |
2625 | static int setup_buffer_reg_streams(struct buffer_reg_channel *reg_chan, | |
fb45065e MD |
2626 | struct ust_app_channel *ua_chan, |
2627 | struct ust_app *app) | |
7972aab2 DG |
2628 | { |
2629 | int ret = 0; | |
2630 | struct ust_app_stream *stream, *stmp; | |
2631 | ||
2632 | assert(reg_chan); | |
2633 | assert(ua_chan); | |
2634 | ||
2635 | DBG2("UST app setup buffer registry stream"); | |
2636 | ||
2637 | /* Send all streams to application. */ | |
2638 | cds_list_for_each_entry_safe(stream, stmp, &ua_chan->streams.head, list) { | |
2639 | struct buffer_reg_stream *reg_stream; | |
2640 | ||
2641 | ret = buffer_reg_stream_create(®_stream); | |
2642 | if (ret < 0) { | |
2643 | goto error; | |
2644 | } | |
2645 | ||
2646 | /* | |
2647 | * Keep original pointer and nullify it in the stream so the delete | |
2648 | * stream call does not release the object. | |
2649 | */ | |
2650 | reg_stream->obj.ust = stream->obj; | |
2651 | stream->obj = NULL; | |
2652 | buffer_reg_stream_add(reg_stream, reg_chan); | |
421cb601 | 2653 | |
7972aab2 DG |
2654 | /* We don't need the streams anymore. */ |
2655 | cds_list_del(&stream->list); | |
fb45065e | 2656 | delete_ust_app_stream(-1, stream, app); |
7972aab2 | 2657 | } |
421cb601 | 2658 | |
7972aab2 DG |
2659 | error: |
2660 | return ret; | |
2661 | } | |
2662 | ||
2663 | /* | |
2664 | * Create a buffer registry channel for the given session registry and | |
2665 | * application channel object. If regp pointer is valid, it's set with the | |
2666 | * created object. Important, the created object is NOT added to the session | |
2667 | * registry hash table. | |
2668 | * | |
2669 | * Return 0 on success else a negative value. | |
2670 | */ | |
2671 | static int create_buffer_reg_channel(struct buffer_reg_session *reg_sess, | |
2672 | struct ust_app_channel *ua_chan, struct buffer_reg_channel **regp) | |
2673 | { | |
2674 | int ret; | |
2675 | struct buffer_reg_channel *reg_chan = NULL; | |
2676 | ||
2677 | assert(reg_sess); | |
2678 | assert(ua_chan); | |
2679 | ||
2680 | DBG2("UST app creating buffer registry channel for %s", ua_chan->name); | |
2681 | ||
2682 | /* Create buffer registry channel. */ | |
2683 | ret = buffer_reg_channel_create(ua_chan->tracing_channel_id, ®_chan); | |
2684 | if (ret < 0) { | |
2685 | goto error_create; | |
421cb601 | 2686 | } |
7972aab2 DG |
2687 | assert(reg_chan); |
2688 | reg_chan->consumer_key = ua_chan->key; | |
8c924c7b | 2689 | reg_chan->subbuf_size = ua_chan->attr.subbuf_size; |
d07ceecd | 2690 | reg_chan->num_subbuf = ua_chan->attr.num_subbuf; |
421cb601 | 2691 | |
7972aab2 DG |
2692 | /* Create and add a channel registry to session. */ |
2693 | ret = ust_registry_channel_add(reg_sess->reg.ust, | |
2694 | ua_chan->tracing_channel_id); | |
2695 | if (ret < 0) { | |
2696 | goto error; | |
d88aee68 | 2697 | } |
7972aab2 | 2698 | buffer_reg_channel_add(reg_sess, reg_chan); |
d88aee68 | 2699 | |
7972aab2 DG |
2700 | if (regp) { |
2701 | *regp = reg_chan; | |
3d8ca23b | 2702 | } |
d88aee68 | 2703 | |
7972aab2 | 2704 | return 0; |
3d8ca23b DG |
2705 | |
2706 | error: | |
7972aab2 DG |
2707 | /* Safe because the registry channel object was not added to any HT. */ |
2708 | buffer_reg_channel_destroy(reg_chan, LTTNG_DOMAIN_UST); | |
2709 | error_create: | |
3d8ca23b | 2710 | return ret; |
421cb601 DG |
2711 | } |
2712 | ||
55cc08a6 | 2713 | /* |
7972aab2 DG |
2714 | * Setup buffer registry channel for the given session registry and application |
2715 | * channel object. If regp pointer is valid, it's set with the created object. | |
d0b96690 | 2716 | * |
7972aab2 | 2717 | * Return 0 on success else a negative value. |
55cc08a6 | 2718 | */ |
7972aab2 | 2719 | static int setup_buffer_reg_channel(struct buffer_reg_session *reg_sess, |
fb45065e MD |
2720 | struct ust_app_channel *ua_chan, struct buffer_reg_channel *reg_chan, |
2721 | struct ust_app *app) | |
55cc08a6 | 2722 | { |
7972aab2 | 2723 | int ret; |
55cc08a6 | 2724 | |
7972aab2 DG |
2725 | assert(reg_sess); |
2726 | assert(reg_chan); | |
2727 | assert(ua_chan); | |
2728 | assert(ua_chan->obj); | |
55cc08a6 | 2729 | |
7972aab2 | 2730 | DBG2("UST app setup buffer registry channel for %s", ua_chan->name); |
55cc08a6 | 2731 | |
7972aab2 | 2732 | /* Setup all streams for the registry. */ |
fb45065e | 2733 | ret = setup_buffer_reg_streams(reg_chan, ua_chan, app); |
7972aab2 | 2734 | if (ret < 0) { |
55cc08a6 DG |
2735 | goto error; |
2736 | } | |
2737 | ||
7972aab2 DG |
2738 | reg_chan->obj.ust = ua_chan->obj; |
2739 | ua_chan->obj = NULL; | |
55cc08a6 | 2740 | |
7972aab2 | 2741 | return 0; |
55cc08a6 DG |
2742 | |
2743 | error: | |
7972aab2 DG |
2744 | buffer_reg_channel_remove(reg_sess, reg_chan); |
2745 | buffer_reg_channel_destroy(reg_chan, LTTNG_DOMAIN_UST); | |
55cc08a6 DG |
2746 | return ret; |
2747 | } | |
2748 | ||
edb67388 | 2749 | /* |
7972aab2 | 2750 | * Send buffer registry channel to the application. |
d0b96690 | 2751 | * |
7972aab2 | 2752 | * Return 0 on success else a negative value. |
edb67388 | 2753 | */ |
7972aab2 DG |
2754 | static int send_channel_uid_to_ust(struct buffer_reg_channel *reg_chan, |
2755 | struct ust_app *app, struct ust_app_session *ua_sess, | |
2756 | struct ust_app_channel *ua_chan) | |
edb67388 DG |
2757 | { |
2758 | int ret; | |
7972aab2 | 2759 | struct buffer_reg_stream *reg_stream; |
edb67388 | 2760 | |
7972aab2 DG |
2761 | assert(reg_chan); |
2762 | assert(app); | |
2763 | assert(ua_sess); | |
2764 | assert(ua_chan); | |
2765 | ||
2766 | DBG("UST app sending buffer registry channel to ust sock %d", app->sock); | |
2767 | ||
2768 | ret = duplicate_channel_object(reg_chan, ua_chan); | |
edb67388 DG |
2769 | if (ret < 0) { |
2770 | goto error; | |
2771 | } | |
2772 | ||
7972aab2 DG |
2773 | /* Send channel to the application. */ |
2774 | ret = ust_consumer_send_channel_to_ust(app, ua_sess, ua_chan); | |
a7169585 MD |
2775 | if (ret == -EPIPE || ret == -LTTNG_UST_ERR_EXITING) { |
2776 | ret = -ENOTCONN; /* Caused by app exiting. */ | |
2777 | goto error; | |
2778 | } else if (ret < 0) { | |
7972aab2 DG |
2779 | goto error; |
2780 | } | |
2781 | ||
2782 | health_code_update(); | |
2783 | ||
2784 | /* Send all streams to application. */ | |
2785 | pthread_mutex_lock(®_chan->stream_list_lock); | |
2786 | cds_list_for_each_entry(reg_stream, ®_chan->streams, lnode) { | |
2787 | struct ust_app_stream stream; | |
2788 | ||
2789 | ret = duplicate_stream_object(reg_stream, &stream); | |
2790 | if (ret < 0) { | |
2791 | goto error_stream_unlock; | |
2792 | } | |
2793 | ||
2794 | ret = ust_consumer_send_stream_to_ust(app, ua_chan, &stream); | |
2795 | if (ret < 0) { | |
fb45065e | 2796 | (void) release_ust_app_stream(-1, &stream, app); |
a7169585 MD |
2797 | if (ret == -EPIPE || ret == -LTTNG_UST_ERR_EXITING) { |
2798 | ret = -ENOTCONN; /* Caused by app exiting. */ | |
2799 | goto error_stream_unlock; | |
2800 | } else if (ret < 0) { | |
2801 | goto error_stream_unlock; | |
2802 | } | |
7972aab2 DG |
2803 | goto error_stream_unlock; |
2804 | } | |
edb67388 | 2805 | |
7972aab2 DG |
2806 | /* |
2807 | * The return value is not important here. This function will output an | |
2808 | * error if needed. | |
2809 | */ | |
fb45065e | 2810 | (void) release_ust_app_stream(-1, &stream, app); |
7972aab2 DG |
2811 | } |
2812 | ua_chan->is_sent = 1; | |
2813 | ||
2814 | error_stream_unlock: | |
2815 | pthread_mutex_unlock(®_chan->stream_list_lock); | |
edb67388 DG |
2816 | error: |
2817 | return ret; | |
2818 | } | |
2819 | ||
9730260e | 2820 | /* |
7972aab2 DG |
2821 | * Create and send to the application the created buffers with per UID buffers. |
2822 | * | |
2823 | * Return 0 on success else a negative value. | |
9730260e | 2824 | */ |
7972aab2 DG |
2825 | static int create_channel_per_uid(struct ust_app *app, |
2826 | struct ltt_ust_session *usess, struct ust_app_session *ua_sess, | |
2827 | struct ust_app_channel *ua_chan) | |
9730260e DG |
2828 | { |
2829 | int ret; | |
7972aab2 DG |
2830 | struct buffer_reg_uid *reg_uid; |
2831 | struct buffer_reg_channel *reg_chan; | |
9730260e | 2832 | |
7972aab2 DG |
2833 | assert(app); |
2834 | assert(usess); | |
2835 | assert(ua_sess); | |
2836 | assert(ua_chan); | |
2837 | ||
2838 | DBG("UST app creating channel %s with per UID buffers", ua_chan->name); | |
2839 | ||
2840 | reg_uid = buffer_reg_uid_find(usess->id, app->bits_per_long, app->uid); | |
2841 | /* | |
2842 | * The session creation handles the creation of this global registry | |
2843 | * object. If none can be find, there is a code flow problem or a | |
2844 | * teardown race. | |
2845 | */ | |
2846 | assert(reg_uid); | |
2847 | ||
2848 | reg_chan = buffer_reg_channel_find(ua_chan->tracing_channel_id, | |
2849 | reg_uid); | |
2850 | if (!reg_chan) { | |
2851 | /* Create the buffer registry channel object. */ | |
2852 | ret = create_buffer_reg_channel(reg_uid->registry, ua_chan, ®_chan); | |
2853 | if (ret < 0) { | |
f14256d6 MD |
2854 | ERR("Error creating the UST channel \"%s\" registry instance", |
2855 | ua_chan->name); | |
7972aab2 DG |
2856 | goto error; |
2857 | } | |
2858 | assert(reg_chan); | |
2859 | ||
2860 | /* | |
2861 | * Create the buffers on the consumer side. This call populates the | |
2862 | * ust app channel object with all streams and data object. | |
2863 | */ | |
2864 | ret = do_consumer_create_channel(usess, ua_sess, ua_chan, | |
2865 | app->bits_per_long, reg_uid->registry->reg.ust); | |
2866 | if (ret < 0) { | |
f14256d6 MD |
2867 | ERR("Error creating UST channel \"%s\" on the consumer daemon", |
2868 | ua_chan->name); | |
2869 | ||
07d2ae95 DG |
2870 | /* |
2871 | * Let's remove the previously created buffer registry channel so | |
2872 | * it's not visible anymore in the session registry. | |
2873 | */ | |
2874 | ust_registry_channel_del_free(reg_uid->registry->reg.ust, | |
2875 | ua_chan->tracing_channel_id); | |
2876 | buffer_reg_channel_remove(reg_uid->registry, reg_chan); | |
2877 | buffer_reg_channel_destroy(reg_chan, LTTNG_DOMAIN_UST); | |
7972aab2 DG |
2878 | goto error; |
2879 | } | |
2880 | ||
2881 | /* | |
2882 | * Setup the streams and add it to the session registry. | |
2883 | */ | |
fb45065e MD |
2884 | ret = setup_buffer_reg_channel(reg_uid->registry, |
2885 | ua_chan, reg_chan, app); | |
7972aab2 | 2886 | if (ret < 0) { |
f14256d6 MD |
2887 | ERR("Error setting up UST channel \"%s\"", |
2888 | ua_chan->name); | |
7972aab2 DG |
2889 | goto error; |
2890 | } | |
2891 | ||
2892 | } | |
2893 | ||
2894 | /* Send buffers to the application. */ | |
2895 | ret = send_channel_uid_to_ust(reg_chan, app, ua_sess, ua_chan); | |
9730260e | 2896 | if (ret < 0) { |
a7169585 MD |
2897 | if (ret != -ENOTCONN) { |
2898 | ERR("Error sending channel to application"); | |
2899 | } | |
9730260e DG |
2900 | goto error; |
2901 | } | |
2902 | ||
9730260e DG |
2903 | error: |
2904 | return ret; | |
2905 | } | |
2906 | ||
78f0bacd | 2907 | /* |
7972aab2 DG |
2908 | * Create and send to the application the created buffers with per PID buffers. |
2909 | * | |
2910 | * Return 0 on success else a negative value. | |
78f0bacd | 2911 | */ |
7972aab2 DG |
2912 | static int create_channel_per_pid(struct ust_app *app, |
2913 | struct ltt_ust_session *usess, struct ust_app_session *ua_sess, | |
2914 | struct ust_app_channel *ua_chan) | |
78f0bacd | 2915 | { |
8535a6d9 | 2916 | int ret; |
7972aab2 | 2917 | struct ust_registry_session *registry; |
78f0bacd | 2918 | |
7972aab2 DG |
2919 | assert(app); |
2920 | assert(usess); | |
2921 | assert(ua_sess); | |
2922 | assert(ua_chan); | |
2923 | ||
2924 | DBG("UST app creating channel %s with per PID buffers", ua_chan->name); | |
2925 | ||
2926 | rcu_read_lock(); | |
2927 | ||
2928 | registry = get_session_registry(ua_sess); | |
2929 | assert(registry); | |
2930 | ||
2931 | /* Create and add a new channel registry to session. */ | |
2932 | ret = ust_registry_channel_add(registry, ua_chan->key); | |
78f0bacd | 2933 | if (ret < 0) { |
f14256d6 MD |
2934 | ERR("Error creating the UST channel \"%s\" registry instance", |
2935 | ua_chan->name); | |
78f0bacd DG |
2936 | goto error; |
2937 | } | |
2938 | ||
7972aab2 DG |
2939 | /* Create and get channel on the consumer side. */ |
2940 | ret = do_consumer_create_channel(usess, ua_sess, ua_chan, | |
2941 | app->bits_per_long, registry); | |
2942 | if (ret < 0) { | |
f14256d6 MD |
2943 | ERR("Error creating UST channel \"%s\" on the consumer daemon", |
2944 | ua_chan->name); | |
7972aab2 DG |
2945 | goto error; |
2946 | } | |
2947 | ||
2948 | ret = send_channel_pid_to_ust(app, ua_sess, ua_chan); | |
2949 | if (ret < 0) { | |
a7169585 MD |
2950 | if (ret != -ENOTCONN) { |
2951 | ERR("Error sending channel to application"); | |
2952 | } | |
7972aab2 DG |
2953 | goto error; |
2954 | } | |
8535a6d9 | 2955 | |
78f0bacd | 2956 | error: |
7972aab2 | 2957 | rcu_read_unlock(); |
78f0bacd DG |
2958 | return ret; |
2959 | } | |
2960 | ||
2961 | /* | |
7972aab2 DG |
2962 | * From an already allocated ust app channel, create the channel buffers if |
2963 | * need and send it to the application. This MUST be called with a RCU read | |
2964 | * side lock acquired. | |
2965 | * | |
a7169585 MD |
2966 | * Return 0 on success or else a negative value. Returns -ENOTCONN if |
2967 | * the application exited concurrently. | |
78f0bacd | 2968 | */ |
7972aab2 DG |
2969 | static int do_create_channel(struct ust_app *app, |
2970 | struct ltt_ust_session *usess, struct ust_app_session *ua_sess, | |
2971 | struct ust_app_channel *ua_chan) | |
78f0bacd | 2972 | { |
7972aab2 | 2973 | int ret; |
78f0bacd | 2974 | |
7972aab2 DG |
2975 | assert(app); |
2976 | assert(usess); | |
2977 | assert(ua_sess); | |
2978 | assert(ua_chan); | |
2979 | ||
2980 | /* Handle buffer type before sending the channel to the application. */ | |
2981 | switch (usess->buffer_type) { | |
2982 | case LTTNG_BUFFER_PER_UID: | |
2983 | { | |
2984 | ret = create_channel_per_uid(app, usess, ua_sess, ua_chan); | |
2985 | if (ret < 0) { | |
2986 | goto error; | |
2987 | } | |
2988 | break; | |
2989 | } | |
2990 | case LTTNG_BUFFER_PER_PID: | |
2991 | { | |
2992 | ret = create_channel_per_pid(app, usess, ua_sess, ua_chan); | |
2993 | if (ret < 0) { | |
2994 | goto error; | |
2995 | } | |
2996 | break; | |
2997 | } | |
2998 | default: | |
2999 | assert(0); | |
3000 | ret = -EINVAL; | |
78f0bacd DG |
3001 | goto error; |
3002 | } | |
3003 | ||
7972aab2 DG |
3004 | /* Initialize ust objd object using the received handle and add it. */ |
3005 | lttng_ht_node_init_ulong(&ua_chan->ust_objd_node, ua_chan->handle); | |
3006 | lttng_ht_add_unique_ulong(app->ust_objd, &ua_chan->ust_objd_node); | |
78f0bacd | 3007 | |
7972aab2 DG |
3008 | /* If channel is not enabled, disable it on the tracer */ |
3009 | if (!ua_chan->enabled) { | |
3010 | ret = disable_ust_channel(app, ua_sess, ua_chan); | |
3011 | if (ret < 0) { | |
3012 | goto error; | |
3013 | } | |
78f0bacd DG |
3014 | } |
3015 | ||
3016 | error: | |
3017 | return ret; | |
3018 | } | |
3019 | ||
284d8f55 | 3020 | /* |
4d710ac2 DG |
3021 | * Create UST app channel and create it on the tracer. Set ua_chanp of the |
3022 | * newly created channel if not NULL. | |
d0b96690 | 3023 | * |
36b588ed | 3024 | * Called with UST app session lock and RCU read-side lock held. |
7972aab2 | 3025 | * |
a7169585 MD |
3026 | * Return 0 on success or else a negative value. Returns -ENOTCONN if |
3027 | * the application exited concurrently. | |
284d8f55 | 3028 | */ |
4d710ac2 DG |
3029 | static int create_ust_app_channel(struct ust_app_session *ua_sess, |
3030 | struct ltt_ust_channel *uchan, struct ust_app *app, | |
7972aab2 | 3031 | enum lttng_ust_chan_type type, struct ltt_ust_session *usess, |
4d710ac2 | 3032 | struct ust_app_channel **ua_chanp) |
5b4a0ec0 DG |
3033 | { |
3034 | int ret = 0; | |
bec39940 DG |
3035 | struct lttng_ht_iter iter; |
3036 | struct lttng_ht_node_str *ua_chan_node; | |
5b4a0ec0 DG |
3037 | struct ust_app_channel *ua_chan; |
3038 | ||
3039 | /* Lookup channel in the ust app session */ | |
bec39940 DG |
3040 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &iter); |
3041 | ua_chan_node = lttng_ht_iter_get_node_str(&iter); | |
fc34caaa | 3042 | if (ua_chan_node != NULL) { |
5b4a0ec0 | 3043 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); |
fc34caaa | 3044 | goto end; |
5b4a0ec0 DG |
3045 | } |
3046 | ||
d0b96690 | 3047 | ua_chan = alloc_ust_app_channel(uchan->name, ua_sess, &uchan->attr); |
fc34caaa DG |
3048 | if (ua_chan == NULL) { |
3049 | /* Only malloc can fail here */ | |
4d710ac2 | 3050 | ret = -ENOMEM; |
094d1690 | 3051 | goto error_alloc; |
fc34caaa DG |
3052 | } |
3053 | shadow_copy_channel(ua_chan, uchan); | |
3054 | ||
ffe60014 DG |
3055 | /* Set channel type. */ |
3056 | ua_chan->attr.type = type; | |
3057 | ||
7972aab2 | 3058 | ret = do_create_channel(app, usess, ua_sess, ua_chan); |
5b4a0ec0 DG |
3059 | if (ret < 0) { |
3060 | goto error; | |
3061 | } | |
3062 | ||
fc34caaa | 3063 | DBG2("UST app create channel %s for PID %d completed", ua_chan->name, |
852d0037 | 3064 | app->pid); |
fc34caaa | 3065 | |
d0b96690 DG |
3066 | /* Only add the channel if successful on the tracer side. */ |
3067 | lttng_ht_add_unique_str(ua_sess->channels, &ua_chan->node); | |
3068 | ||
fc34caaa | 3069 | end: |
4d710ac2 DG |
3070 | if (ua_chanp) { |
3071 | *ua_chanp = ua_chan; | |
3072 | } | |
3073 | ||
3074 | /* Everything went well. */ | |
3075 | return 0; | |
5b4a0ec0 DG |
3076 | |
3077 | error: | |
d0b96690 | 3078 | delete_ust_app_channel(ua_chan->is_sent ? app->sock : -1, ua_chan, app); |
094d1690 | 3079 | error_alloc: |
4d710ac2 | 3080 | return ret; |
5b4a0ec0 DG |
3081 | } |
3082 | ||
3083 | /* | |
3084 | * Create UST app event and create it on the tracer side. | |
d0b96690 DG |
3085 | * |
3086 | * Called with ust app session mutex held. | |
5b4a0ec0 | 3087 | */ |
edb67388 DG |
3088 | static |
3089 | int create_ust_app_event(struct ust_app_session *ua_sess, | |
3090 | struct ust_app_channel *ua_chan, struct ltt_ust_event *uevent, | |
3091 | struct ust_app *app) | |
284d8f55 | 3092 | { |
edb67388 | 3093 | int ret = 0; |
5b4a0ec0 | 3094 | struct ust_app_event *ua_event; |
284d8f55 | 3095 | |
5b4a0ec0 | 3096 | /* Get event node */ |
18eace3b | 3097 | ua_event = find_ust_app_event(ua_chan->events, uevent->attr.name, |
39c5a3a7 | 3098 | uevent->filter, uevent->attr.loglevel, uevent->exclusion); |
18eace3b | 3099 | if (ua_event != NULL) { |
fc34caaa | 3100 | ret = -EEXIST; |
edb67388 DG |
3101 | goto end; |
3102 | } | |
5b4a0ec0 | 3103 | |
edb67388 DG |
3104 | /* Does not exist so create one */ |
3105 | ua_event = alloc_ust_app_event(uevent->attr.name, &uevent->attr); | |
3106 | if (ua_event == NULL) { | |
3107 | /* Only malloc can failed so something is really wrong */ | |
3108 | ret = -ENOMEM; | |
fc34caaa | 3109 | goto end; |
5b4a0ec0 | 3110 | } |
edb67388 | 3111 | shadow_copy_event(ua_event, uevent); |
5b4a0ec0 | 3112 | |
edb67388 | 3113 | /* Create it on the tracer side */ |
5b4a0ec0 | 3114 | ret = create_ust_event(app, ua_sess, ua_chan, ua_event); |
284d8f55 | 3115 | if (ret < 0) { |
fc34caaa | 3116 | /* Not found previously means that it does not exist on the tracer */ |
76f66f63 | 3117 | assert(ret != -LTTNG_UST_ERR_EXIST); |
284d8f55 DG |
3118 | goto error; |
3119 | } | |
3120 | ||
d0b96690 | 3121 | add_unique_ust_app_event(ua_chan, ua_event); |
284d8f55 | 3122 | |
fc34caaa | 3123 | DBG2("UST app create event %s for PID %d completed", ua_event->name, |
852d0037 | 3124 | app->pid); |
7f79d3a1 | 3125 | |
edb67388 | 3126 | end: |
fc34caaa DG |
3127 | return ret; |
3128 | ||
5b4a0ec0 | 3129 | error: |
fc34caaa | 3130 | /* Valid. Calling here is already in a read side lock */ |
fb45065e | 3131 | delete_ust_app_event(-1, ua_event, app); |
edb67388 | 3132 | return ret; |
5b4a0ec0 DG |
3133 | } |
3134 | ||
3135 | /* | |
3136 | * Create UST metadata and open it on the tracer side. | |
d0b96690 | 3137 | * |
7972aab2 | 3138 | * Called with UST app session lock held and RCU read side lock. |
5b4a0ec0 DG |
3139 | */ |
3140 | static int create_ust_app_metadata(struct ust_app_session *ua_sess, | |
ad7a9107 | 3141 | struct ust_app *app, struct consumer_output *consumer) |
5b4a0ec0 DG |
3142 | { |
3143 | int ret = 0; | |
ffe60014 | 3144 | struct ust_app_channel *metadata; |
d88aee68 | 3145 | struct consumer_socket *socket; |
7972aab2 | 3146 | struct ust_registry_session *registry; |
5b4a0ec0 | 3147 | |
ffe60014 DG |
3148 | assert(ua_sess); |
3149 | assert(app); | |
d88aee68 | 3150 | assert(consumer); |
5b4a0ec0 | 3151 | |
7972aab2 DG |
3152 | registry = get_session_registry(ua_sess); |
3153 | assert(registry); | |
3154 | ||
ce34fcd0 MD |
3155 | pthread_mutex_lock(®istry->lock); |
3156 | ||
1b532a60 DG |
3157 | /* Metadata already exists for this registry or it was closed previously */ |
3158 | if (registry->metadata_key || registry->metadata_closed) { | |
7972aab2 DG |
3159 | ret = 0; |
3160 | goto error; | |
5b4a0ec0 DG |
3161 | } |
3162 | ||
ffe60014 | 3163 | /* Allocate UST metadata */ |
d0b96690 | 3164 | metadata = alloc_ust_app_channel(DEFAULT_METADATA_NAME, ua_sess, NULL); |
ffe60014 DG |
3165 | if (!metadata) { |
3166 | /* malloc() failed */ | |
3167 | ret = -ENOMEM; | |
3168 | goto error; | |
3169 | } | |
5b4a0ec0 | 3170 | |
ad7a9107 | 3171 | memcpy(&metadata->attr, &ua_sess->metadata_attr, sizeof(metadata->attr)); |
5b4a0ec0 | 3172 | |
7972aab2 DG |
3173 | /* Need one fd for the channel. */ |
3174 | ret = lttng_fd_get(LTTNG_FD_APPS, 1); | |
3175 | if (ret < 0) { | |
3176 | ERR("Exhausted number of available FD upon create metadata"); | |
3177 | goto error; | |
3178 | } | |
3179 | ||
4dc3dfc5 DG |
3180 | /* Get the right consumer socket for the application. */ |
3181 | socket = consumer_find_socket_by_bitness(app->bits_per_long, consumer); | |
3182 | if (!socket) { | |
3183 | ret = -EINVAL; | |
3184 | goto error_consumer; | |
3185 | } | |
3186 | ||
331744e3 JD |
3187 | /* |
3188 | * Keep metadata key so we can identify it on the consumer side. Assign it | |
3189 | * to the registry *before* we ask the consumer so we avoid the race of the | |
3190 | * consumer requesting the metadata and the ask_channel call on our side | |
3191 | * did not returned yet. | |
3192 | */ | |
3193 | registry->metadata_key = metadata->key; | |
3194 | ||
d88aee68 DG |
3195 | /* |
3196 | * Ask the metadata channel creation to the consumer. The metadata object | |
3197 | * will be created by the consumer and kept their. However, the stream is | |
3198 | * never added or monitored until we do a first push metadata to the | |
3199 | * consumer. | |
3200 | */ | |
7972aab2 DG |
3201 | ret = ust_consumer_ask_channel(ua_sess, metadata, consumer, socket, |
3202 | registry); | |
d88aee68 | 3203 | if (ret < 0) { |
f2a444f1 DG |
3204 | /* Nullify the metadata key so we don't try to close it later on. */ |
3205 | registry->metadata_key = 0; | |
d88aee68 DG |
3206 | goto error_consumer; |
3207 | } | |
3208 | ||
3209 | /* | |
3210 | * The setup command will make the metadata stream be sent to the relayd, | |
3211 | * if applicable, and the thread managing the metadatas. This is important | |
3212 | * because after this point, if an error occurs, the only way the stream | |
3213 | * can be deleted is to be monitored in the consumer. | |
3214 | */ | |
7972aab2 | 3215 | ret = consumer_setup_metadata(socket, metadata->key); |
ffe60014 | 3216 | if (ret < 0) { |
f2a444f1 DG |
3217 | /* Nullify the metadata key so we don't try to close it later on. */ |
3218 | registry->metadata_key = 0; | |
d88aee68 | 3219 | goto error_consumer; |
5b4a0ec0 DG |
3220 | } |
3221 | ||
7972aab2 DG |
3222 | DBG2("UST metadata with key %" PRIu64 " created for app pid %d", |
3223 | metadata->key, app->pid); | |
5b4a0ec0 | 3224 | |
d88aee68 | 3225 | error_consumer: |
b80f0b6c | 3226 | lttng_fd_put(LTTNG_FD_APPS, 1); |
d88aee68 | 3227 | delete_ust_app_channel(-1, metadata, app); |
5b4a0ec0 | 3228 | error: |
ce34fcd0 | 3229 | pthread_mutex_unlock(®istry->lock); |
ffe60014 | 3230 | return ret; |
5b4a0ec0 DG |
3231 | } |
3232 | ||
5b4a0ec0 | 3233 | /* |
d88aee68 DG |
3234 | * Return ust app pointer or NULL if not found. RCU read side lock MUST be |
3235 | * acquired before calling this function. | |
5b4a0ec0 DG |
3236 | */ |
3237 | struct ust_app *ust_app_find_by_pid(pid_t pid) | |
3238 | { | |
d88aee68 | 3239 | struct ust_app *app = NULL; |
bec39940 DG |
3240 | struct lttng_ht_node_ulong *node; |
3241 | struct lttng_ht_iter iter; | |
5b4a0ec0 | 3242 | |
bec39940 DG |
3243 | lttng_ht_lookup(ust_app_ht, (void *)((unsigned long) pid), &iter); |
3244 | node = lttng_ht_iter_get_node_ulong(&iter); | |
5b4a0ec0 DG |
3245 | if (node == NULL) { |
3246 | DBG2("UST app no found with pid %d", pid); | |
3247 | goto error; | |
3248 | } | |
5b4a0ec0 DG |
3249 | |
3250 | DBG2("Found UST app by pid %d", pid); | |
3251 | ||
d88aee68 | 3252 | app = caa_container_of(node, struct ust_app, pid_n); |
5b4a0ec0 DG |
3253 | |
3254 | error: | |
d88aee68 | 3255 | return app; |
5b4a0ec0 DG |
3256 | } |
3257 | ||
d88aee68 DG |
3258 | /* |
3259 | * Allocate and init an UST app object using the registration information and | |
3260 | * the command socket. This is called when the command socket connects to the | |
3261 | * session daemon. | |
3262 | * | |
3263 | * The object is returned on success or else NULL. | |
3264 | */ | |
d0b96690 | 3265 | struct ust_app *ust_app_create(struct ust_register_msg *msg, int sock) |
5b4a0ec0 | 3266 | { |
d0b96690 DG |
3267 | struct ust_app *lta = NULL; |
3268 | ||
3269 | assert(msg); | |
3270 | assert(sock >= 0); | |
3271 | ||
3272 | DBG3("UST app creating application for socket %d", sock); | |
5b4a0ec0 | 3273 | |
173af62f DG |
3274 | if ((msg->bits_per_long == 64 && |
3275 | (uatomic_read(&ust_consumerd64_fd) == -EINVAL)) | |
3276 | || (msg->bits_per_long == 32 && | |
3277 | (uatomic_read(&ust_consumerd32_fd) == -EINVAL))) { | |
f943b0fb | 3278 | ERR("Registration failed: application \"%s\" (pid: %d) has " |
d0b96690 DG |
3279 | "%d-bit long, but no consumerd for this size is available.\n", |
3280 | msg->name, msg->pid, msg->bits_per_long); | |
3281 | goto error; | |
3f2c5fcc | 3282 | } |
d0b96690 | 3283 | |
5b4a0ec0 DG |
3284 | lta = zmalloc(sizeof(struct ust_app)); |
3285 | if (lta == NULL) { | |
3286 | PERROR("malloc"); | |
d0b96690 | 3287 | goto error; |
5b4a0ec0 DG |
3288 | } |
3289 | ||
3290 | lta->ppid = msg->ppid; | |
3291 | lta->uid = msg->uid; | |
3292 | lta->gid = msg->gid; | |
d0b96690 | 3293 | |
7753dea8 | 3294 | lta->bits_per_long = msg->bits_per_long; |
d0b96690 DG |
3295 | lta->uint8_t_alignment = msg->uint8_t_alignment; |
3296 | lta->uint16_t_alignment = msg->uint16_t_alignment; | |
3297 | lta->uint32_t_alignment = msg->uint32_t_alignment; | |
3298 | lta->uint64_t_alignment = msg->uint64_t_alignment; | |
3299 | lta->long_alignment = msg->long_alignment; | |
3300 | lta->byte_order = msg->byte_order; | |
3301 | ||
5b4a0ec0 DG |
3302 | lta->v_major = msg->major; |
3303 | lta->v_minor = msg->minor; | |
d9bf3ca4 | 3304 | lta->sessions = lttng_ht_new(0, LTTNG_HT_TYPE_U64); |
d0b96690 | 3305 | lta->ust_objd = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); |
10b56aef | 3306 | lta->ust_sessions_objd = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); |
d0b96690 | 3307 | lta->notify_sock = -1; |
d88aee68 DG |
3308 | |
3309 | /* Copy name and make sure it's NULL terminated. */ | |
3310 | strncpy(lta->name, msg->name, sizeof(lta->name)); | |
3311 | lta->name[UST_APP_PROCNAME_LEN] = '\0'; | |
3312 | ||
3313 | /* | |
3314 | * Before this can be called, when receiving the registration information, | |
3315 | * the application compatibility is checked. So, at this point, the | |
3316 | * application can work with this session daemon. | |
3317 | */ | |
d0b96690 | 3318 | lta->compatible = 1; |
5b4a0ec0 | 3319 | |
852d0037 | 3320 | lta->pid = msg->pid; |
d0b96690 | 3321 | lttng_ht_node_init_ulong(<a->pid_n, (unsigned long) lta->pid); |
852d0037 | 3322 | lta->sock = sock; |
fb45065e | 3323 | pthread_mutex_init(<a->sock_lock, NULL); |
d0b96690 | 3324 | lttng_ht_node_init_ulong(<a->sock_n, (unsigned long) lta->sock); |
5b4a0ec0 | 3325 | |
d42f20df | 3326 | CDS_INIT_LIST_HEAD(<a->teardown_head); |
d0b96690 DG |
3327 | error: |
3328 | return lta; | |
3329 | } | |
3330 | ||
d88aee68 DG |
3331 | /* |
3332 | * For a given application object, add it to every hash table. | |
3333 | */ | |
d0b96690 DG |
3334 | void ust_app_add(struct ust_app *app) |
3335 | { | |
3336 | assert(app); | |
3337 | assert(app->notify_sock >= 0); | |
3338 | ||
5b4a0ec0 | 3339 | rcu_read_lock(); |
852d0037 DG |
3340 | |
3341 | /* | |
3342 | * On a re-registration, we want to kick out the previous registration of | |
3343 | * that pid | |
3344 | */ | |
d0b96690 | 3345 | lttng_ht_add_replace_ulong(ust_app_ht, &app->pid_n); |
852d0037 DG |
3346 | |
3347 | /* | |
3348 | * The socket _should_ be unique until _we_ call close. So, a add_unique | |
3349 | * for the ust_app_ht_by_sock is used which asserts fail if the entry was | |
3350 | * already in the table. | |
3351 | */ | |
d0b96690 | 3352 | lttng_ht_add_unique_ulong(ust_app_ht_by_sock, &app->sock_n); |
852d0037 | 3353 | |
d0b96690 DG |
3354 | /* Add application to the notify socket hash table. */ |
3355 | lttng_ht_node_init_ulong(&app->notify_sock_n, app->notify_sock); | |
3356 | lttng_ht_add_unique_ulong(ust_app_ht_by_notify_sock, &app->notify_sock_n); | |
5b4a0ec0 | 3357 | |
d0b96690 | 3358 | DBG("App registered with pid:%d ppid:%d uid:%d gid:%d sock:%d name:%s " |
d88aee68 DG |
3359 | "notify_sock:%d (version %d.%d)", app->pid, app->ppid, app->uid, |
3360 | app->gid, app->sock, app->name, app->notify_sock, app->v_major, | |
3361 | app->v_minor); | |
5b4a0ec0 | 3362 | |
d0b96690 DG |
3363 | rcu_read_unlock(); |
3364 | } | |
3365 | ||
d88aee68 DG |
3366 | /* |
3367 | * Set the application version into the object. | |
3368 | * | |
3369 | * Return 0 on success else a negative value either an errno code or a | |
3370 | * LTTng-UST error code. | |
3371 | */ | |
d0b96690 DG |
3372 | int ust_app_version(struct ust_app *app) |
3373 | { | |
d88aee68 DG |
3374 | int ret; |
3375 | ||
d0b96690 | 3376 | assert(app); |
d88aee68 | 3377 | |
fb45065e | 3378 | pthread_mutex_lock(&app->sock_lock); |
d88aee68 | 3379 | ret = ustctl_tracer_version(app->sock, &app->version); |
fb45065e | 3380 | pthread_mutex_unlock(&app->sock_lock); |
d88aee68 DG |
3381 | if (ret < 0) { |
3382 | if (ret != -LTTNG_UST_ERR_EXITING && ret != -EPIPE) { | |
5368d366 | 3383 | ERR("UST app %d version failed with ret %d", app->sock, ret); |
d88aee68 | 3384 | } else { |
5368d366 | 3385 | DBG3("UST app %d version failed. Application is dead", app->sock); |
d88aee68 DG |
3386 | } |
3387 | } | |
3388 | ||
3389 | return ret; | |
5b4a0ec0 DG |
3390 | } |
3391 | ||
3392 | /* | |
3393 | * Unregister app by removing it from the global traceable app list and freeing | |
3394 | * the data struct. | |
3395 | * | |
3396 | * The socket is already closed at this point so no close to sock. | |
3397 | */ | |
3398 | void ust_app_unregister(int sock) | |
3399 | { | |
3400 | struct ust_app *lta; | |
bec39940 | 3401 | struct lttng_ht_node_ulong *node; |
c4b88406 | 3402 | struct lttng_ht_iter ust_app_sock_iter; |
bec39940 | 3403 | struct lttng_ht_iter iter; |
d42f20df | 3404 | struct ust_app_session *ua_sess; |
525b0740 | 3405 | int ret; |
5b4a0ec0 DG |
3406 | |
3407 | rcu_read_lock(); | |
886459c6 | 3408 | |
5b4a0ec0 | 3409 | /* Get the node reference for a call_rcu */ |
c4b88406 MD |
3410 | lttng_ht_lookup(ust_app_ht_by_sock, (void *)((unsigned long) sock), &ust_app_sock_iter); |
3411 | node = lttng_ht_iter_get_node_ulong(&ust_app_sock_iter); | |
d0b96690 | 3412 | assert(node); |
284d8f55 | 3413 | |
852d0037 | 3414 | lta = caa_container_of(node, struct ust_app, sock_n); |
852d0037 DG |
3415 | DBG("PID %d unregistering with sock %d", lta->pid, sock); |
3416 | ||
d88aee68 | 3417 | /* |
ce34fcd0 MD |
3418 | * For per-PID buffers, perform "push metadata" and flush all |
3419 | * application streams before removing app from hash tables, | |
3420 | * ensuring proper behavior of data_pending check. | |
c4b88406 | 3421 | * Remove sessions so they are not visible during deletion. |
d88aee68 | 3422 | */ |
d42f20df DG |
3423 | cds_lfht_for_each_entry(lta->sessions->ht, &iter.iter, ua_sess, |
3424 | node.node) { | |
7972aab2 DG |
3425 | struct ust_registry_session *registry; |
3426 | ||
d42f20df DG |
3427 | ret = lttng_ht_del(lta->sessions, &iter); |
3428 | if (ret) { | |
3429 | /* The session was already removed so scheduled for teardown. */ | |
3430 | continue; | |
3431 | } | |
3432 | ||
ce34fcd0 MD |
3433 | if (ua_sess->buffer_type == LTTNG_BUFFER_PER_PID) { |
3434 | (void) ust_app_flush_app_session(lta, ua_sess); | |
3435 | } | |
c4b88406 | 3436 | |
d42f20df DG |
3437 | /* |
3438 | * Add session to list for teardown. This is safe since at this point we | |
3439 | * are the only one using this list. | |
3440 | */ | |
d88aee68 DG |
3441 | pthread_mutex_lock(&ua_sess->lock); |
3442 | ||
b161602a MD |
3443 | if (ua_sess->deleted) { |
3444 | pthread_mutex_unlock(&ua_sess->lock); | |
3445 | continue; | |
3446 | } | |
3447 | ||
d88aee68 DG |
3448 | /* |
3449 | * Normally, this is done in the delete session process which is | |
3450 | * executed in the call rcu below. However, upon registration we can't | |
3451 | * afford to wait for the grace period before pushing data or else the | |
3452 | * data pending feature can race between the unregistration and stop | |
3453 | * command where the data pending command is sent *before* the grace | |
3454 | * period ended. | |
3455 | * | |
3456 | * The close metadata below nullifies the metadata pointer in the | |
3457 | * session so the delete session will NOT push/close a second time. | |
3458 | */ | |
7972aab2 | 3459 | registry = get_session_registry(ua_sess); |
ce34fcd0 | 3460 | if (registry) { |
7972aab2 DG |
3461 | /* Push metadata for application before freeing the application. */ |
3462 | (void) push_metadata(registry, ua_sess->consumer); | |
3463 | ||
3464 | /* | |
3465 | * Don't ask to close metadata for global per UID buffers. Close | |
1b532a60 DG |
3466 | * metadata only on destroy trace session in this case. Also, the |
3467 | * previous push metadata could have flag the metadata registry to | |
3468 | * close so don't send a close command if closed. | |
7972aab2 | 3469 | */ |
ce34fcd0 | 3470 | if (ua_sess->buffer_type != LTTNG_BUFFER_PER_UID) { |
7972aab2 DG |
3471 | /* And ask to close it for this session registry. */ |
3472 | (void) close_metadata(registry, ua_sess->consumer); | |
3473 | } | |
3474 | } | |
d42f20df | 3475 | cds_list_add(&ua_sess->teardown_node, <a->teardown_head); |
c4b88406 | 3476 | |
d88aee68 | 3477 | pthread_mutex_unlock(&ua_sess->lock); |
d42f20df DG |
3478 | } |
3479 | ||
c4b88406 MD |
3480 | /* Remove application from PID hash table */ |
3481 | ret = lttng_ht_del(ust_app_ht_by_sock, &ust_app_sock_iter); | |
3482 | assert(!ret); | |
3483 | ||
3484 | /* | |
3485 | * Remove application from notify hash table. The thread handling the | |
3486 | * notify socket could have deleted the node so ignore on error because | |
3487 | * either way it's valid. The close of that socket is handled by the other | |
3488 | * thread. | |
3489 | */ | |
3490 | iter.iter.node = <a->notify_sock_n.node; | |
3491 | (void) lttng_ht_del(ust_app_ht_by_notify_sock, &iter); | |
3492 | ||
3493 | /* | |
3494 | * Ignore return value since the node might have been removed before by an | |
3495 | * add replace during app registration because the PID can be reassigned by | |
3496 | * the OS. | |
3497 | */ | |
3498 | iter.iter.node = <a->pid_n.node; | |
3499 | ret = lttng_ht_del(ust_app_ht, &iter); | |
3500 | if (ret) { | |
3501 | DBG3("Unregister app by PID %d failed. This can happen on pid reuse", | |
3502 | lta->pid); | |
3503 | } | |
3504 | ||
852d0037 DG |
3505 | /* Free memory */ |
3506 | call_rcu(<a->pid_n.head, delete_ust_app_rcu); | |
3507 | ||
5b4a0ec0 DG |
3508 | rcu_read_unlock(); |
3509 | return; | |
284d8f55 DG |
3510 | } |
3511 | ||
5b4a0ec0 DG |
3512 | /* |
3513 | * Fill events array with all events name of all registered apps. | |
3514 | */ | |
3515 | int ust_app_list_events(struct lttng_event **events) | |
421cb601 | 3516 | { |
5b4a0ec0 DG |
3517 | int ret, handle; |
3518 | size_t nbmem, count = 0; | |
bec39940 | 3519 | struct lttng_ht_iter iter; |
5b4a0ec0 | 3520 | struct ust_app *app; |
c617c0c6 | 3521 | struct lttng_event *tmp_event; |
421cb601 | 3522 | |
5b4a0ec0 | 3523 | nbmem = UST_APP_EVENT_LIST_SIZE; |
c617c0c6 MD |
3524 | tmp_event = zmalloc(nbmem * sizeof(struct lttng_event)); |
3525 | if (tmp_event == NULL) { | |
5b4a0ec0 DG |
3526 | PERROR("zmalloc ust app events"); |
3527 | ret = -ENOMEM; | |
421cb601 DG |
3528 | goto error; |
3529 | } | |
3530 | ||
5b4a0ec0 | 3531 | rcu_read_lock(); |
421cb601 | 3532 | |
852d0037 | 3533 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
90eaa0d2 | 3534 | struct lttng_ust_tracepoint_iter uiter; |
ac3bd9c0 | 3535 | |
840cb59c | 3536 | health_code_update(); |
86acf0da | 3537 | |
e0c7ec2b DG |
3538 | if (!app->compatible) { |
3539 | /* | |
3540 | * TODO: In time, we should notice the caller of this error by | |
3541 | * telling him that this is a version error. | |
3542 | */ | |
3543 | continue; | |
3544 | } | |
fb45065e | 3545 | pthread_mutex_lock(&app->sock_lock); |
852d0037 | 3546 | handle = ustctl_tracepoint_list(app->sock); |
5b4a0ec0 | 3547 | if (handle < 0) { |
ffe60014 DG |
3548 | if (handle != -EPIPE && handle != -LTTNG_UST_ERR_EXITING) { |
3549 | ERR("UST app list events getting handle failed for app pid %d", | |
3550 | app->pid); | |
3551 | } | |
fb45065e | 3552 | pthread_mutex_unlock(&app->sock_lock); |
5b4a0ec0 DG |
3553 | continue; |
3554 | } | |
421cb601 | 3555 | |
852d0037 | 3556 | while ((ret = ustctl_tracepoint_list_get(app->sock, handle, |
fb54cdbf | 3557 | &uiter)) != -LTTNG_UST_ERR_NOENT) { |
ffe60014 DG |
3558 | /* Handle ustctl error. */ |
3559 | if (ret < 0) { | |
fb45065e MD |
3560 | int release_ret; |
3561 | ||
a2ba1ab0 | 3562 | if (ret != -LTTNG_UST_ERR_EXITING && ret != -EPIPE) { |
ffe60014 DG |
3563 | ERR("UST app tp list get failed for app %d with ret %d", |
3564 | app->sock, ret); | |
3565 | } else { | |
3566 | DBG3("UST app tp list get failed. Application is dead"); | |
3757b385 DG |
3567 | /* |
3568 | * This is normal behavior, an application can die during the | |
3569 | * creation process. Don't report an error so the execution can | |
3570 | * continue normally. Continue normal execution. | |
3571 | */ | |
3572 | break; | |
ffe60014 | 3573 | } |
98f595d4 | 3574 | free(tmp_event); |
fb45065e | 3575 | release_ret = ustctl_release_handle(app->sock, handle); |
68313703 JG |
3576 | if (release_ret < 0 && |
3577 | release_ret != -LTTNG_UST_ERR_EXITING && | |
3578 | release_ret != -EPIPE) { | |
fb45065e MD |
3579 | ERR("Error releasing app handle for app %d with ret %d", app->sock, release_ret); |
3580 | } | |
3581 | pthread_mutex_unlock(&app->sock_lock); | |
ffe60014 DG |
3582 | goto rcu_error; |
3583 | } | |
3584 | ||
840cb59c | 3585 | health_code_update(); |
815564d8 | 3586 | if (count >= nbmem) { |
d7b3776f | 3587 | /* In case the realloc fails, we free the memory */ |
53efb85a MD |
3588 | struct lttng_event *new_tmp_event; |
3589 | size_t new_nbmem; | |
3590 | ||
3591 | new_nbmem = nbmem << 1; | |
3592 | DBG2("Reallocating event list from %zu to %zu entries", | |
3593 | nbmem, new_nbmem); | |
3594 | new_tmp_event = realloc(tmp_event, | |
3595 | new_nbmem * sizeof(struct lttng_event)); | |
3596 | if (new_tmp_event == NULL) { | |
fb45065e MD |
3597 | int release_ret; |
3598 | ||
5b4a0ec0 | 3599 | PERROR("realloc ust app events"); |
c617c0c6 | 3600 | free(tmp_event); |
5b4a0ec0 | 3601 | ret = -ENOMEM; |
fb45065e | 3602 | release_ret = ustctl_release_handle(app->sock, handle); |
68313703 JG |
3603 | if (release_ret < 0 && |
3604 | release_ret != -LTTNG_UST_ERR_EXITING && | |
3605 | release_ret != -EPIPE) { | |
fb45065e MD |
3606 | ERR("Error releasing app handle for app %d with ret %d", app->sock, release_ret); |
3607 | } | |
3608 | pthread_mutex_unlock(&app->sock_lock); | |
5b4a0ec0 DG |
3609 | goto rcu_error; |
3610 | } | |
53efb85a MD |
3611 | /* Zero the new memory */ |
3612 | memset(new_tmp_event + nbmem, 0, | |
3613 | (new_nbmem - nbmem) * sizeof(struct lttng_event)); | |
3614 | nbmem = new_nbmem; | |
3615 | tmp_event = new_tmp_event; | |
5b4a0ec0 | 3616 | } |
c617c0c6 MD |
3617 | memcpy(tmp_event[count].name, uiter.name, LTTNG_UST_SYM_NAME_LEN); |
3618 | tmp_event[count].loglevel = uiter.loglevel; | |
3619 | tmp_event[count].type = (enum lttng_event_type) LTTNG_UST_TRACEPOINT; | |
3620 | tmp_event[count].pid = app->pid; | |
3621 | tmp_event[count].enabled = -1; | |
5b4a0ec0 | 3622 | count++; |
421cb601 | 3623 | } |
fb45065e MD |
3624 | ret = ustctl_release_handle(app->sock, handle); |
3625 | pthread_mutex_unlock(&app->sock_lock); | |
68313703 | 3626 | if (ret < 0 && ret != -LTTNG_UST_ERR_EXITING && ret != -EPIPE) { |
fb45065e MD |
3627 | ERR("Error releasing app handle for app %d with ret %d", app->sock, ret); |
3628 | } | |
421cb601 DG |
3629 | } |
3630 | ||
5b4a0ec0 | 3631 | ret = count; |
c617c0c6 | 3632 | *events = tmp_event; |
421cb601 | 3633 | |
5b4a0ec0 | 3634 | DBG2("UST app list events done (%zu events)", count); |
421cb601 | 3635 | |
5b4a0ec0 DG |
3636 | rcu_error: |
3637 | rcu_read_unlock(); | |
421cb601 | 3638 | error: |
840cb59c | 3639 | health_code_update(); |
5b4a0ec0 | 3640 | return ret; |
421cb601 DG |
3641 | } |
3642 | ||
f37d259d MD |
3643 | /* |
3644 | * Fill events array with all events name of all registered apps. | |
3645 | */ | |
3646 | int ust_app_list_event_fields(struct lttng_event_field **fields) | |
3647 | { | |
3648 | int ret, handle; | |
3649 | size_t nbmem, count = 0; | |
3650 | struct lttng_ht_iter iter; | |
3651 | struct ust_app *app; | |
c617c0c6 | 3652 | struct lttng_event_field *tmp_event; |
f37d259d MD |
3653 | |
3654 | nbmem = UST_APP_EVENT_LIST_SIZE; | |
c617c0c6 MD |
3655 | tmp_event = zmalloc(nbmem * sizeof(struct lttng_event_field)); |
3656 | if (tmp_event == NULL) { | |
f37d259d MD |
3657 | PERROR("zmalloc ust app event fields"); |
3658 | ret = -ENOMEM; | |
3659 | goto error; | |
3660 | } | |
3661 | ||
3662 | rcu_read_lock(); | |
3663 | ||
3664 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { | |
3665 | struct lttng_ust_field_iter uiter; | |
3666 | ||
840cb59c | 3667 | health_code_update(); |
86acf0da | 3668 | |
f37d259d MD |
3669 | if (!app->compatible) { |
3670 | /* | |
3671 | * TODO: In time, we should notice the caller of this error by | |
3672 | * telling him that this is a version error. | |
3673 | */ | |
3674 | continue; | |
3675 | } | |
fb45065e | 3676 | pthread_mutex_lock(&app->sock_lock); |
f37d259d MD |
3677 | handle = ustctl_tracepoint_field_list(app->sock); |
3678 | if (handle < 0) { | |
ffe60014 DG |
3679 | if (handle != -EPIPE && handle != -LTTNG_UST_ERR_EXITING) { |
3680 | ERR("UST app list field getting handle failed for app pid %d", | |
3681 | app->pid); | |
3682 | } | |
fb45065e | 3683 | pthread_mutex_unlock(&app->sock_lock); |
f37d259d MD |
3684 | continue; |
3685 | } | |
3686 | ||
3687 | while ((ret = ustctl_tracepoint_field_list_get(app->sock, handle, | |
fb54cdbf | 3688 | &uiter)) != -LTTNG_UST_ERR_NOENT) { |
ffe60014 DG |
3689 | /* Handle ustctl error. */ |
3690 | if (ret < 0) { | |
fb45065e MD |
3691 | int release_ret; |
3692 | ||
a2ba1ab0 | 3693 | if (ret != -LTTNG_UST_ERR_EXITING && ret != -EPIPE) { |
ffe60014 DG |
3694 | ERR("UST app tp list field failed for app %d with ret %d", |
3695 | app->sock, ret); | |
3696 | } else { | |
3697 | DBG3("UST app tp list field failed. Application is dead"); | |
3757b385 DG |
3698 | /* |
3699 | * This is normal behavior, an application can die during the | |
3700 | * creation process. Don't report an error so the execution can | |
98f595d4 | 3701 | * continue normally. Reset list and count for next app. |
3757b385 DG |
3702 | */ |
3703 | break; | |
ffe60014 | 3704 | } |
98f595d4 | 3705 | free(tmp_event); |
fb45065e MD |
3706 | release_ret = ustctl_release_handle(app->sock, handle); |
3707 | pthread_mutex_unlock(&app->sock_lock); | |
68313703 JG |
3708 | if (release_ret < 0 && |
3709 | release_ret != -LTTNG_UST_ERR_EXITING && | |
3710 | release_ret != -EPIPE) { | |
fb45065e MD |
3711 | ERR("Error releasing app handle for app %d with ret %d", app->sock, release_ret); |
3712 | } | |
ffe60014 DG |
3713 | goto rcu_error; |
3714 | } | |
3715 | ||
840cb59c | 3716 | health_code_update(); |
f37d259d | 3717 | if (count >= nbmem) { |
d7b3776f | 3718 | /* In case the realloc fails, we free the memory */ |
53efb85a MD |
3719 | struct lttng_event_field *new_tmp_event; |
3720 | size_t new_nbmem; | |
3721 | ||
3722 | new_nbmem = nbmem << 1; | |
3723 | DBG2("Reallocating event field list from %zu to %zu entries", | |
3724 | nbmem, new_nbmem); | |
3725 | new_tmp_event = realloc(tmp_event, | |
3726 | new_nbmem * sizeof(struct lttng_event_field)); | |
3727 | if (new_tmp_event == NULL) { | |
fb45065e MD |
3728 | int release_ret; |
3729 | ||
f37d259d | 3730 | PERROR("realloc ust app event fields"); |
c617c0c6 | 3731 | free(tmp_event); |
f37d259d | 3732 | ret = -ENOMEM; |
fb45065e MD |
3733 | release_ret = ustctl_release_handle(app->sock, handle); |
3734 | pthread_mutex_unlock(&app->sock_lock); | |
68313703 JG |
3735 | if (release_ret && |
3736 | release_ret != -LTTNG_UST_ERR_EXITING && | |
3737 | release_ret != -EPIPE) { | |
fb45065e MD |
3738 | ERR("Error releasing app handle for app %d with ret %d", app->sock, release_ret); |
3739 | } | |
f37d259d MD |
3740 | goto rcu_error; |
3741 | } | |
53efb85a MD |
3742 | /* Zero the new memory */ |
3743 | memset(new_tmp_event + nbmem, 0, | |
3744 | (new_nbmem - nbmem) * sizeof(struct lttng_event_field)); | |
3745 | nbmem = new_nbmem; | |
3746 | tmp_event = new_tmp_event; | |
f37d259d | 3747 | } |
f37d259d | 3748 | |
c617c0c6 | 3749 | memcpy(tmp_event[count].field_name, uiter.field_name, LTTNG_UST_SYM_NAME_LEN); |
2e84128e DG |
3750 | /* Mapping between these enums matches 1 to 1. */ |
3751 | tmp_event[count].type = (enum lttng_event_field_type) uiter.type; | |
c617c0c6 | 3752 | tmp_event[count].nowrite = uiter.nowrite; |
f37d259d | 3753 | |
c617c0c6 MD |
3754 | memcpy(tmp_event[count].event.name, uiter.event_name, LTTNG_UST_SYM_NAME_LEN); |
3755 | tmp_event[count].event.loglevel = uiter.loglevel; | |
2e84128e | 3756 | tmp_event[count].event.type = LTTNG_EVENT_TRACEPOINT; |
c617c0c6 MD |
3757 | tmp_event[count].event.pid = app->pid; |
3758 | tmp_event[count].event.enabled = -1; | |
f37d259d MD |
3759 | count++; |
3760 | } | |
fb45065e MD |
3761 | ret = ustctl_release_handle(app->sock, handle); |
3762 | pthread_mutex_unlock(&app->sock_lock); | |
68313703 JG |
3763 | if (ret < 0 && |
3764 | ret != -LTTNG_UST_ERR_EXITING && | |
3765 | ret != -EPIPE) { | |
fb45065e MD |
3766 | ERR("Error releasing app handle for app %d with ret %d", app->sock, ret); |
3767 | } | |
f37d259d MD |
3768 | } |
3769 | ||
3770 | ret = count; | |
c617c0c6 | 3771 | *fields = tmp_event; |
f37d259d MD |
3772 | |
3773 | DBG2("UST app list event fields done (%zu events)", count); | |
3774 | ||
3775 | rcu_error: | |
3776 | rcu_read_unlock(); | |
3777 | error: | |
840cb59c | 3778 | health_code_update(); |
f37d259d MD |
3779 | return ret; |
3780 | } | |
3781 | ||
5b4a0ec0 DG |
3782 | /* |
3783 | * Free and clean all traceable apps of the global list. | |
36b588ed MD |
3784 | * |
3785 | * Should _NOT_ be called with RCU read-side lock held. | |
5b4a0ec0 DG |
3786 | */ |
3787 | void ust_app_clean_list(void) | |
421cb601 | 3788 | { |
5b4a0ec0 | 3789 | int ret; |
659ed79f | 3790 | struct ust_app *app; |
bec39940 | 3791 | struct lttng_ht_iter iter; |
421cb601 | 3792 | |
5b4a0ec0 | 3793 | DBG2("UST app cleaning registered apps hash table"); |
421cb601 | 3794 | |
5b4a0ec0 | 3795 | rcu_read_lock(); |
421cb601 | 3796 | |
f1b711c4 MD |
3797 | if (ust_app_ht) { |
3798 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { | |
3799 | ret = lttng_ht_del(ust_app_ht, &iter); | |
3800 | assert(!ret); | |
3801 | call_rcu(&app->pid_n.head, delete_ust_app_rcu); | |
3802 | } | |
421cb601 DG |
3803 | } |
3804 | ||
852d0037 | 3805 | /* Cleanup socket hash table */ |
f1b711c4 MD |
3806 | if (ust_app_ht_by_sock) { |
3807 | cds_lfht_for_each_entry(ust_app_ht_by_sock->ht, &iter.iter, app, | |
3808 | sock_n.node) { | |
3809 | ret = lttng_ht_del(ust_app_ht_by_sock, &iter); | |
3810 | assert(!ret); | |
3811 | } | |
bec39940 | 3812 | } |
852d0037 | 3813 | |
d88aee68 | 3814 | /* Cleanup notify socket hash table */ |
f1b711c4 MD |
3815 | if (ust_app_ht_by_notify_sock) { |
3816 | cds_lfht_for_each_entry(ust_app_ht_by_notify_sock->ht, &iter.iter, app, | |
3817 | notify_sock_n.node) { | |
3818 | ret = lttng_ht_del(ust_app_ht_by_notify_sock, &iter); | |
3819 | assert(!ret); | |
3820 | } | |
d88aee68 | 3821 | } |
36b588ed | 3822 | rcu_read_unlock(); |
d88aee68 | 3823 | |
bec39940 | 3824 | /* Destroy is done only when the ht is empty */ |
f1b711c4 MD |
3825 | if (ust_app_ht) { |
3826 | ht_cleanup_push(ust_app_ht); | |
3827 | } | |
3828 | if (ust_app_ht_by_sock) { | |
3829 | ht_cleanup_push(ust_app_ht_by_sock); | |
3830 | } | |
3831 | if (ust_app_ht_by_notify_sock) { | |
3832 | ht_cleanup_push(ust_app_ht_by_notify_sock); | |
3833 | } | |
5b4a0ec0 DG |
3834 | } |
3835 | ||
3836 | /* | |
3837 | * Init UST app hash table. | |
3838 | */ | |
57703f6e | 3839 | int ust_app_ht_alloc(void) |
5b4a0ec0 | 3840 | { |
bec39940 | 3841 | ust_app_ht = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); |
57703f6e MD |
3842 | if (!ust_app_ht) { |
3843 | return -1; | |
3844 | } | |
852d0037 | 3845 | ust_app_ht_by_sock = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); |
57703f6e MD |
3846 | if (!ust_app_ht_by_sock) { |
3847 | return -1; | |
3848 | } | |
d0b96690 | 3849 | ust_app_ht_by_notify_sock = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); |
57703f6e MD |
3850 | if (!ust_app_ht_by_notify_sock) { |
3851 | return -1; | |
3852 | } | |
3853 | return 0; | |
421cb601 DG |
3854 | } |
3855 | ||
78f0bacd DG |
3856 | /* |
3857 | * For a specific UST session, disable the channel for all registered apps. | |
3858 | */ | |
35a9059d | 3859 | int ust_app_disable_channel_glb(struct ltt_ust_session *usess, |
78f0bacd DG |
3860 | struct ltt_ust_channel *uchan) |
3861 | { | |
3862 | int ret = 0; | |
bec39940 DG |
3863 | struct lttng_ht_iter iter; |
3864 | struct lttng_ht_node_str *ua_chan_node; | |
78f0bacd DG |
3865 | struct ust_app *app; |
3866 | struct ust_app_session *ua_sess; | |
8535a6d9 | 3867 | struct ust_app_channel *ua_chan; |
78f0bacd DG |
3868 | |
3869 | if (usess == NULL || uchan == NULL) { | |
3870 | ERR("Disabling UST global channel with NULL values"); | |
3871 | ret = -1; | |
3872 | goto error; | |
3873 | } | |
3874 | ||
d9bf3ca4 | 3875 | DBG2("UST app disabling channel %s from global domain for session id %" PRIu64, |
a991f516 | 3876 | uchan->name, usess->id); |
78f0bacd DG |
3877 | |
3878 | rcu_read_lock(); | |
3879 | ||
3880 | /* For every registered applications */ | |
852d0037 | 3881 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
bec39940 | 3882 | struct lttng_ht_iter uiter; |
e0c7ec2b DG |
3883 | if (!app->compatible) { |
3884 | /* | |
3885 | * TODO: In time, we should notice the caller of this error by | |
3886 | * telling him that this is a version error. | |
3887 | */ | |
3888 | continue; | |
3889 | } | |
78f0bacd DG |
3890 | ua_sess = lookup_session_by_app(usess, app); |
3891 | if (ua_sess == NULL) { | |
3892 | continue; | |
3893 | } | |
3894 | ||
8535a6d9 | 3895 | /* Get channel */ |
bec39940 DG |
3896 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter); |
3897 | ua_chan_node = lttng_ht_iter_get_node_str(&uiter); | |
8535a6d9 DG |
3898 | /* If the session if found for the app, the channel must be there */ |
3899 | assert(ua_chan_node); | |
3900 | ||
3901 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); | |
3902 | /* The channel must not be already disabled */ | |
3903 | assert(ua_chan->enabled == 1); | |
3904 | ||
3905 | /* Disable channel onto application */ | |
3906 | ret = disable_ust_app_channel(ua_sess, ua_chan, app); | |
78f0bacd DG |
3907 | if (ret < 0) { |
3908 | /* XXX: We might want to report this error at some point... */ | |
3909 | continue; | |
3910 | } | |
3911 | } | |
3912 | ||
3913 | rcu_read_unlock(); | |
3914 | ||
3915 | error: | |
3916 | return ret; | |
3917 | } | |
3918 | ||
3919 | /* | |
3920 | * For a specific UST session, enable the channel for all registered apps. | |
3921 | */ | |
35a9059d | 3922 | int ust_app_enable_channel_glb(struct ltt_ust_session *usess, |
78f0bacd DG |
3923 | struct ltt_ust_channel *uchan) |
3924 | { | |
3925 | int ret = 0; | |
bec39940 | 3926 | struct lttng_ht_iter iter; |
78f0bacd DG |
3927 | struct ust_app *app; |
3928 | struct ust_app_session *ua_sess; | |
3929 | ||
3930 | if (usess == NULL || uchan == NULL) { | |
3931 | ERR("Adding UST global channel to NULL values"); | |
3932 | ret = -1; | |
3933 | goto error; | |
3934 | } | |
3935 | ||
d9bf3ca4 | 3936 | DBG2("UST app enabling channel %s to global domain for session id %" PRIu64, |
a991f516 | 3937 | uchan->name, usess->id); |
78f0bacd DG |
3938 | |
3939 | rcu_read_lock(); | |
3940 | ||
3941 | /* For every registered applications */ | |
852d0037 | 3942 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
e0c7ec2b DG |
3943 | if (!app->compatible) { |
3944 | /* | |
3945 | * TODO: In time, we should notice the caller of this error by | |
3946 | * telling him that this is a version error. | |
3947 | */ | |
3948 | continue; | |
3949 | } | |
78f0bacd DG |
3950 | ua_sess = lookup_session_by_app(usess, app); |
3951 | if (ua_sess == NULL) { | |
3952 | continue; | |
3953 | } | |
3954 | ||
3955 | /* Enable channel onto application */ | |
3956 | ret = enable_ust_app_channel(ua_sess, uchan, app); | |
3957 | if (ret < 0) { | |
3958 | /* XXX: We might want to report this error at some point... */ | |
3959 | continue; | |
3960 | } | |
3961 | } | |
3962 | ||
3963 | rcu_read_unlock(); | |
3964 | ||
3965 | error: | |
3966 | return ret; | |
3967 | } | |
3968 | ||
b0a40d28 DG |
3969 | /* |
3970 | * Disable an event in a channel and for a specific session. | |
3971 | */ | |
35a9059d DG |
3972 | int ust_app_disable_event_glb(struct ltt_ust_session *usess, |
3973 | struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent) | |
b0a40d28 DG |
3974 | { |
3975 | int ret = 0; | |
bec39940 | 3976 | struct lttng_ht_iter iter, uiter; |
700c5a9d | 3977 | struct lttng_ht_node_str *ua_chan_node; |
b0a40d28 DG |
3978 | struct ust_app *app; |
3979 | struct ust_app_session *ua_sess; | |
3980 | struct ust_app_channel *ua_chan; | |
3981 | struct ust_app_event *ua_event; | |
3982 | ||
3983 | DBG("UST app disabling event %s for all apps in channel " | |
d9bf3ca4 MD |
3984 | "%s for session id %" PRIu64, |
3985 | uevent->attr.name, uchan->name, usess->id); | |
b0a40d28 DG |
3986 | |
3987 | rcu_read_lock(); | |
3988 | ||
3989 | /* For all registered applications */ | |
852d0037 | 3990 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
e0c7ec2b DG |
3991 | if (!app->compatible) { |
3992 | /* | |
3993 | * TODO: In time, we should notice the caller of this error by | |
3994 | * telling him that this is a version error. | |
3995 | */ | |
3996 | continue; | |
3997 | } | |
b0a40d28 DG |
3998 | ua_sess = lookup_session_by_app(usess, app); |
3999 | if (ua_sess == NULL) { | |
4000 | /* Next app */ | |
4001 | continue; | |
4002 | } | |
4003 | ||
4004 | /* Lookup channel in the ust app session */ | |
bec39940 DG |
4005 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter); |
4006 | ua_chan_node = lttng_ht_iter_get_node_str(&uiter); | |
b0a40d28 | 4007 | if (ua_chan_node == NULL) { |
d9bf3ca4 | 4008 | DBG2("Channel %s not found in session id %" PRIu64 " for app pid %d." |
852d0037 | 4009 | "Skipping", uchan->name, usess->id, app->pid); |
b0a40d28 DG |
4010 | continue; |
4011 | } | |
4012 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); | |
4013 | ||
700c5a9d JR |
4014 | ua_event = find_ust_app_event(ua_chan->events, uevent->attr.name, |
4015 | uevent->filter, uevent->attr.loglevel, | |
4016 | uevent->exclusion); | |
4017 | if (ua_event == NULL) { | |
b0a40d28 | 4018 | DBG2("Event %s not found in channel %s for app pid %d." |
852d0037 | 4019 | "Skipping", uevent->attr.name, uchan->name, app->pid); |
b0a40d28 DG |
4020 | continue; |
4021 | } | |
b0a40d28 | 4022 | |
7f79d3a1 | 4023 | ret = disable_ust_app_event(ua_sess, ua_event, app); |
b0a40d28 DG |
4024 | if (ret < 0) { |
4025 | /* XXX: Report error someday... */ | |
4026 | continue; | |
4027 | } | |
4028 | } | |
4029 | ||
4030 | rcu_read_unlock(); | |
4031 | ||
4032 | return ret; | |
4033 | } | |
4034 | ||
421cb601 | 4035 | /* |
5b4a0ec0 | 4036 | * For a specific UST session, create the channel for all registered apps. |
421cb601 | 4037 | */ |
35a9059d | 4038 | int ust_app_create_channel_glb(struct ltt_ust_session *usess, |
48842b30 DG |
4039 | struct ltt_ust_channel *uchan) |
4040 | { | |
3d8ca23b | 4041 | int ret = 0, created; |
bec39940 | 4042 | struct lttng_ht_iter iter; |
48842b30 | 4043 | struct ust_app *app; |
3d8ca23b | 4044 | struct ust_app_session *ua_sess = NULL; |
48842b30 | 4045 | |
fc34caaa DG |
4046 | /* Very wrong code flow */ |
4047 | assert(usess); | |
4048 | assert(uchan); | |
421cb601 | 4049 | |
d9bf3ca4 | 4050 | DBG2("UST app adding channel %s to UST domain for session id %" PRIu64, |
a991f516 | 4051 | uchan->name, usess->id); |
48842b30 DG |
4052 | |
4053 | rcu_read_lock(); | |
421cb601 | 4054 | |
5b4a0ec0 | 4055 | /* For every registered applications */ |
852d0037 | 4056 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
e0c7ec2b DG |
4057 | if (!app->compatible) { |
4058 | /* | |
4059 | * TODO: In time, we should notice the caller of this error by | |
4060 | * telling him that this is a version error. | |
4061 | */ | |
4062 | continue; | |
4063 | } | |
a9ad0c8f MD |
4064 | if (!trace_ust_pid_tracker_lookup(usess, app->pid)) { |
4065 | /* Skip. */ | |
4066 | continue; | |
4067 | } | |
4068 | ||
edb67388 DG |
4069 | /* |
4070 | * Create session on the tracer side and add it to app session HT. Note | |
4071 | * that if session exist, it will simply return a pointer to the ust | |
4072 | * app session. | |
4073 | */ | |
3d8ca23b DG |
4074 | ret = create_ust_app_session(usess, app, &ua_sess, &created); |
4075 | if (ret < 0) { | |
4076 | switch (ret) { | |
4077 | case -ENOTCONN: | |
4078 | /* | |
4079 | * The application's socket is not valid. Either a bad socket | |
4080 | * or a timeout on it. We can't inform the caller that for a | |
4081 | * specific app, the session failed so lets continue here. | |
4082 | */ | |
a7169585 | 4083 | ret = 0; /* Not an error. */ |
3d8ca23b DG |
4084 | continue; |
4085 | case -ENOMEM: | |
4086 | default: | |
4087 | goto error_rcu_unlock; | |
4088 | } | |
48842b30 | 4089 | } |
3d8ca23b | 4090 | assert(ua_sess); |
48842b30 | 4091 | |
d0b96690 | 4092 | pthread_mutex_lock(&ua_sess->lock); |
b161602a MD |
4093 | |
4094 | if (ua_sess->deleted) { | |
4095 | pthread_mutex_unlock(&ua_sess->lock); | |
4096 | continue; | |
4097 | } | |
4098 | ||
d65d2de8 DG |
4099 | if (!strncmp(uchan->name, DEFAULT_METADATA_NAME, |
4100 | sizeof(uchan->name))) { | |
ad7a9107 DG |
4101 | copy_channel_attr_to_ustctl(&ua_sess->metadata_attr, &uchan->attr); |
4102 | ret = 0; | |
d65d2de8 DG |
4103 | } else { |
4104 | /* Create channel onto application. We don't need the chan ref. */ | |
4105 | ret = create_ust_app_channel(ua_sess, uchan, app, | |
4106 | LTTNG_UST_CHAN_PER_CPU, usess, NULL); | |
4107 | } | |
d0b96690 | 4108 | pthread_mutex_unlock(&ua_sess->lock); |
3d8ca23b | 4109 | if (ret < 0) { |
3d8ca23b DG |
4110 | /* Cleanup the created session if it's the case. */ |
4111 | if (created) { | |
d0b96690 | 4112 | destroy_app_session(app, ua_sess); |
3d8ca23b | 4113 | } |
a7169585 MD |
4114 | switch (ret) { |
4115 | case -ENOTCONN: | |
4116 | /* | |
4117 | * The application's socket is not valid. Either a bad socket | |
4118 | * or a timeout on it. We can't inform the caller that for a | |
4119 | * specific app, the session failed so lets continue here. | |
4120 | */ | |
4121 | ret = 0; /* Not an error. */ | |
4122 | continue; | |
4123 | case -ENOMEM: | |
4124 | default: | |
4125 | goto error_rcu_unlock; | |
4126 | } | |
48842b30 | 4127 | } |
48842b30 | 4128 | } |
5b4a0ec0 | 4129 | |
95e047ff | 4130 | error_rcu_unlock: |
48842b30 | 4131 | rcu_read_unlock(); |
3c14c33f | 4132 | return ret; |
48842b30 DG |
4133 | } |
4134 | ||
5b4a0ec0 | 4135 | /* |
edb67388 | 4136 | * Enable event for a specific session and channel on the tracer. |
5b4a0ec0 | 4137 | */ |
35a9059d | 4138 | int ust_app_enable_event_glb(struct ltt_ust_session *usess, |
48842b30 DG |
4139 | struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent) |
4140 | { | |
4141 | int ret = 0; | |
bec39940 | 4142 | struct lttng_ht_iter iter, uiter; |
18eace3b | 4143 | struct lttng_ht_node_str *ua_chan_node; |
48842b30 DG |
4144 | struct ust_app *app; |
4145 | struct ust_app_session *ua_sess; | |
4146 | struct ust_app_channel *ua_chan; | |
4147 | struct ust_app_event *ua_event; | |
48842b30 | 4148 | |
d9bf3ca4 | 4149 | DBG("UST app enabling event %s for all apps for session id %" PRIu64, |
a991f516 | 4150 | uevent->attr.name, usess->id); |
48842b30 | 4151 | |
edb67388 DG |
4152 | /* |
4153 | * NOTE: At this point, this function is called only if the session and | |
4154 | * channel passed are already created for all apps. and enabled on the | |
4155 | * tracer also. | |
4156 | */ | |
4157 | ||
48842b30 | 4158 | rcu_read_lock(); |
421cb601 DG |
4159 | |
4160 | /* For all registered applications */ | |
852d0037 | 4161 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
e0c7ec2b DG |
4162 | if (!app->compatible) { |
4163 | /* | |
4164 | * TODO: In time, we should notice the caller of this error by | |
4165 | * telling him that this is a version error. | |
4166 | */ | |
4167 | continue; | |
4168 | } | |
edb67388 | 4169 | ua_sess = lookup_session_by_app(usess, app); |
c4a1715b DG |
4170 | if (!ua_sess) { |
4171 | /* The application has problem or is probably dead. */ | |
4172 | continue; | |
4173 | } | |
ba767faf | 4174 | |
d0b96690 DG |
4175 | pthread_mutex_lock(&ua_sess->lock); |
4176 | ||
b161602a MD |
4177 | if (ua_sess->deleted) { |
4178 | pthread_mutex_unlock(&ua_sess->lock); | |
4179 | continue; | |
4180 | } | |
4181 | ||
edb67388 | 4182 | /* Lookup channel in the ust app session */ |
bec39940 DG |
4183 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter); |
4184 | ua_chan_node = lttng_ht_iter_get_node_str(&uiter); | |
a7169585 MD |
4185 | /* |
4186 | * It is possible that the channel cannot be found is | |
4187 | * the channel/event creation occurs concurrently with | |
4188 | * an application exit. | |
4189 | */ | |
4190 | if (!ua_chan_node) { | |
4191 | pthread_mutex_unlock(&ua_sess->lock); | |
4192 | continue; | |
4193 | } | |
edb67388 DG |
4194 | |
4195 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); | |
4196 | ||
18eace3b DG |
4197 | /* Get event node */ |
4198 | ua_event = find_ust_app_event(ua_chan->events, uevent->attr.name, | |
39c5a3a7 | 4199 | uevent->filter, uevent->attr.loglevel, uevent->exclusion); |
18eace3b | 4200 | if (ua_event == NULL) { |
7f79d3a1 | 4201 | DBG3("UST app enable event %s not found for app PID %d." |
852d0037 | 4202 | "Skipping app", uevent->attr.name, app->pid); |
d0b96690 | 4203 | goto next_app; |
35a9059d | 4204 | } |
35a9059d DG |
4205 | |
4206 | ret = enable_ust_app_event(ua_sess, ua_event, app); | |
4207 | if (ret < 0) { | |
d0b96690 | 4208 | pthread_mutex_unlock(&ua_sess->lock); |
7f79d3a1 | 4209 | goto error; |
48842b30 | 4210 | } |
d0b96690 DG |
4211 | next_app: |
4212 | pthread_mutex_unlock(&ua_sess->lock); | |
edb67388 DG |
4213 | } |
4214 | ||
7f79d3a1 | 4215 | error: |
edb67388 | 4216 | rcu_read_unlock(); |
edb67388 DG |
4217 | return ret; |
4218 | } | |
4219 | ||
4220 | /* | |
4221 | * For a specific existing UST session and UST channel, creates the event for | |
4222 | * all registered apps. | |
4223 | */ | |
35a9059d | 4224 | int ust_app_create_event_glb(struct ltt_ust_session *usess, |
edb67388 DG |
4225 | struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent) |
4226 | { | |
4227 | int ret = 0; | |
bec39940 DG |
4228 | struct lttng_ht_iter iter, uiter; |
4229 | struct lttng_ht_node_str *ua_chan_node; | |
edb67388 DG |
4230 | struct ust_app *app; |
4231 | struct ust_app_session *ua_sess; | |
4232 | struct ust_app_channel *ua_chan; | |
4233 | ||
d9bf3ca4 | 4234 | DBG("UST app creating event %s for all apps for session id %" PRIu64, |
a991f516 | 4235 | uevent->attr.name, usess->id); |
edb67388 | 4236 | |
edb67388 DG |
4237 | rcu_read_lock(); |
4238 | ||
4239 | /* For all registered applications */ | |
852d0037 | 4240 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
e0c7ec2b DG |
4241 | if (!app->compatible) { |
4242 | /* | |
4243 | * TODO: In time, we should notice the caller of this error by | |
4244 | * telling him that this is a version error. | |
4245 | */ | |
4246 | continue; | |
4247 | } | |
edb67388 | 4248 | ua_sess = lookup_session_by_app(usess, app); |
c4a1715b DG |
4249 | if (!ua_sess) { |
4250 | /* The application has problem or is probably dead. */ | |
4251 | continue; | |
4252 | } | |
48842b30 | 4253 | |
d0b96690 | 4254 | pthread_mutex_lock(&ua_sess->lock); |
b161602a MD |
4255 | |
4256 | if (ua_sess->deleted) { | |
4257 | pthread_mutex_unlock(&ua_sess->lock); | |
4258 | continue; | |
4259 | } | |
4260 | ||
48842b30 | 4261 | /* Lookup channel in the ust app session */ |
bec39940 DG |
4262 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter); |
4263 | ua_chan_node = lttng_ht_iter_get_node_str(&uiter); | |
edb67388 DG |
4264 | /* If the channel is not found, there is a code flow error */ |
4265 | assert(ua_chan_node); | |
4266 | ||
48842b30 DG |
4267 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); |
4268 | ||
edb67388 | 4269 | ret = create_ust_app_event(ua_sess, ua_chan, uevent, app); |
d0b96690 | 4270 | pthread_mutex_unlock(&ua_sess->lock); |
edb67388 | 4271 | if (ret < 0) { |
49c336c1 | 4272 | if (ret != -LTTNG_UST_ERR_EXIST) { |
fc34caaa DG |
4273 | /* Possible value at this point: -ENOMEM. If so, we stop! */ |
4274 | break; | |
4275 | } | |
4276 | DBG2("UST app event %s already exist on app PID %d", | |
852d0037 | 4277 | uevent->attr.name, app->pid); |
5b4a0ec0 | 4278 | continue; |
48842b30 | 4279 | } |
48842b30 | 4280 | } |
5b4a0ec0 | 4281 | |
48842b30 DG |
4282 | rcu_read_unlock(); |
4283 | ||
4284 | return ret; | |
4285 | } | |
4286 | ||
5b4a0ec0 DG |
4287 | /* |
4288 | * Start tracing for a specific UST session and app. | |
4289 | */ | |
b34cbebf | 4290 | static |
421cb601 | 4291 | int ust_app_start_trace(struct ltt_ust_session *usess, struct ust_app *app) |
48842b30 DG |
4292 | { |
4293 | int ret = 0; | |
48842b30 | 4294 | struct ust_app_session *ua_sess; |
48842b30 | 4295 | |
852d0037 | 4296 | DBG("Starting tracing for ust app pid %d", app->pid); |
5cf5d0e7 | 4297 | |
509cbaf8 MD |
4298 | rcu_read_lock(); |
4299 | ||
e0c7ec2b DG |
4300 | if (!app->compatible) { |
4301 | goto end; | |
4302 | } | |
4303 | ||
421cb601 DG |
4304 | ua_sess = lookup_session_by_app(usess, app); |
4305 | if (ua_sess == NULL) { | |
d42f20df DG |
4306 | /* The session is in teardown process. Ignore and continue. */ |
4307 | goto end; | |
421cb601 | 4308 | } |
48842b30 | 4309 | |
d0b96690 DG |
4310 | pthread_mutex_lock(&ua_sess->lock); |
4311 | ||
b161602a MD |
4312 | if (ua_sess->deleted) { |
4313 | pthread_mutex_unlock(&ua_sess->lock); | |
4314 | goto end; | |
4315 | } | |
4316 | ||
aea829b3 DG |
4317 | /* Upon restart, we skip the setup, already done */ |
4318 | if (ua_sess->started) { | |
8be98f9a | 4319 | goto skip_setup; |
aea829b3 | 4320 | } |
8be98f9a | 4321 | |
a4b92340 DG |
4322 | /* Create directories if consumer is LOCAL and has a path defined. */ |
4323 | if (usess->consumer->type == CONSUMER_DST_LOCAL && | |
4324 | strlen(usess->consumer->dst.trace_path) > 0) { | |
4325 | ret = run_as_mkdir_recursive(usess->consumer->dst.trace_path, | |
7972aab2 | 4326 | S_IRWXU | S_IRWXG, ua_sess->euid, ua_sess->egid); |
a4b92340 | 4327 | if (ret < 0) { |
df5b86c8 | 4328 | if (errno != EEXIST) { |
a4b92340 | 4329 | ERR("Trace directory creation error"); |
d0b96690 | 4330 | goto error_unlock; |
421cb601 | 4331 | } |
173af62f | 4332 | } |
7753dea8 | 4333 | } |
aea829b3 | 4334 | |
d65d2de8 DG |
4335 | /* |
4336 | * Create the metadata for the application. This returns gracefully if a | |
4337 | * metadata was already set for the session. | |
4338 | */ | |
ad7a9107 | 4339 | ret = create_ust_app_metadata(ua_sess, app, usess->consumer); |
421cb601 | 4340 | if (ret < 0) { |
d0b96690 | 4341 | goto error_unlock; |
421cb601 | 4342 | } |
48842b30 | 4343 | |
840cb59c | 4344 | health_code_update(); |
86acf0da | 4345 | |
8be98f9a | 4346 | skip_setup: |
421cb601 | 4347 | /* This start the UST tracing */ |
fb45065e | 4348 | pthread_mutex_lock(&app->sock_lock); |
852d0037 | 4349 | ret = ustctl_start_session(app->sock, ua_sess->handle); |
fb45065e | 4350 | pthread_mutex_unlock(&app->sock_lock); |
421cb601 | 4351 | if (ret < 0) { |
ffe60014 DG |
4352 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
4353 | ERR("Error starting tracing for app pid: %d (ret: %d)", | |
4354 | app->pid, ret); | |
4355 | } else { | |
4356 | DBG("UST app start session failed. Application is dead."); | |
3757b385 DG |
4357 | /* |
4358 | * This is normal behavior, an application can die during the | |
4359 | * creation process. Don't report an error so the execution can | |
4360 | * continue normally. | |
4361 | */ | |
4362 | pthread_mutex_unlock(&ua_sess->lock); | |
4363 | goto end; | |
ffe60014 | 4364 | } |
d0b96690 | 4365 | goto error_unlock; |
421cb601 | 4366 | } |
5b4a0ec0 | 4367 | |
55c3953d DG |
4368 | /* Indicate that the session has been started once */ |
4369 | ua_sess->started = 1; | |
4370 | ||
d0b96690 DG |
4371 | pthread_mutex_unlock(&ua_sess->lock); |
4372 | ||
840cb59c | 4373 | health_code_update(); |
86acf0da | 4374 | |
421cb601 | 4375 | /* Quiescent wait after starting trace */ |
fb45065e | 4376 | pthread_mutex_lock(&app->sock_lock); |
ffe60014 | 4377 | ret = ustctl_wait_quiescent(app->sock); |
fb45065e | 4378 | pthread_mutex_unlock(&app->sock_lock); |
ffe60014 DG |
4379 | if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
4380 | ERR("UST app wait quiescent failed for app pid %d ret %d", | |
4381 | app->pid, ret); | |
4382 | } | |
48842b30 | 4383 | |
e0c7ec2b DG |
4384 | end: |
4385 | rcu_read_unlock(); | |
840cb59c | 4386 | health_code_update(); |
421cb601 | 4387 | return 0; |
48842b30 | 4388 | |
d0b96690 DG |
4389 | error_unlock: |
4390 | pthread_mutex_unlock(&ua_sess->lock); | |
509cbaf8 | 4391 | rcu_read_unlock(); |
840cb59c | 4392 | health_code_update(); |
421cb601 DG |
4393 | return -1; |
4394 | } | |
48842b30 | 4395 | |
8be98f9a MD |
4396 | /* |
4397 | * Stop tracing for a specific UST session and app. | |
4398 | */ | |
b34cbebf | 4399 | static |
8be98f9a MD |
4400 | int ust_app_stop_trace(struct ltt_ust_session *usess, struct ust_app *app) |
4401 | { | |
4402 | int ret = 0; | |
4403 | struct ust_app_session *ua_sess; | |
7972aab2 | 4404 | struct ust_registry_session *registry; |
8be98f9a | 4405 | |
852d0037 | 4406 | DBG("Stopping tracing for ust app pid %d", app->pid); |
8be98f9a MD |
4407 | |
4408 | rcu_read_lock(); | |
4409 | ||
e0c7ec2b | 4410 | if (!app->compatible) { |
d88aee68 | 4411 | goto end_no_session; |
e0c7ec2b DG |
4412 | } |
4413 | ||
8be98f9a MD |
4414 | ua_sess = lookup_session_by_app(usess, app); |
4415 | if (ua_sess == NULL) { | |
d88aee68 | 4416 | goto end_no_session; |
8be98f9a MD |
4417 | } |
4418 | ||
d88aee68 DG |
4419 | pthread_mutex_lock(&ua_sess->lock); |
4420 | ||
b161602a MD |
4421 | if (ua_sess->deleted) { |
4422 | pthread_mutex_unlock(&ua_sess->lock); | |
4423 | goto end_no_session; | |
4424 | } | |
4425 | ||
9bc07046 DG |
4426 | /* |
4427 | * If started = 0, it means that stop trace has been called for a session | |
c45536e1 DG |
4428 | * that was never started. It's possible since we can have a fail start |
4429 | * from either the application manager thread or the command thread. Simply | |
4430 | * indicate that this is a stop error. | |
9bc07046 | 4431 | */ |
f9dfc3d9 | 4432 | if (!ua_sess->started) { |
c45536e1 DG |
4433 | goto error_rcu_unlock; |
4434 | } | |
7db205b5 | 4435 | |
840cb59c | 4436 | health_code_update(); |
86acf0da | 4437 | |
9d6c7d3f | 4438 | /* This inhibits UST tracing */ |
fb45065e | 4439 | pthread_mutex_lock(&app->sock_lock); |
852d0037 | 4440 | ret = ustctl_stop_session(app->sock, ua_sess->handle); |
fb45065e | 4441 | pthread_mutex_unlock(&app->sock_lock); |
9d6c7d3f | 4442 | if (ret < 0) { |
ffe60014 DG |
4443 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
4444 | ERR("Error stopping tracing for app pid: %d (ret: %d)", | |
4445 | app->pid, ret); | |
4446 | } else { | |
4447 | DBG("UST app stop session failed. Application is dead."); | |
3757b385 DG |
4448 | /* |
4449 | * This is normal behavior, an application can die during the | |
4450 | * creation process. Don't report an error so the execution can | |
4451 | * continue normally. | |
4452 | */ | |
4453 | goto end_unlock; | |
ffe60014 | 4454 | } |
9d6c7d3f DG |
4455 | goto error_rcu_unlock; |
4456 | } | |
4457 | ||
840cb59c | 4458 | health_code_update(); |
86acf0da | 4459 | |
9d6c7d3f | 4460 | /* Quiescent wait after stopping trace */ |
fb45065e | 4461 | pthread_mutex_lock(&app->sock_lock); |
ffe60014 | 4462 | ret = ustctl_wait_quiescent(app->sock); |
fb45065e | 4463 | pthread_mutex_unlock(&app->sock_lock); |
ffe60014 DG |
4464 | if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
4465 | ERR("UST app wait quiescent failed for app pid %d ret %d", | |
4466 | app->pid, ret); | |
4467 | } | |
9d6c7d3f | 4468 | |
840cb59c | 4469 | health_code_update(); |
86acf0da | 4470 | |
b34cbebf MD |
4471 | registry = get_session_registry(ua_sess); |
4472 | assert(registry); | |
1b532a60 | 4473 | |
ce34fcd0 MD |
4474 | /* Push metadata for application before freeing the application. */ |
4475 | (void) push_metadata(registry, ua_sess->consumer); | |
b34cbebf | 4476 | |
3757b385 | 4477 | end_unlock: |
b34cbebf MD |
4478 | pthread_mutex_unlock(&ua_sess->lock); |
4479 | end_no_session: | |
4480 | rcu_read_unlock(); | |
4481 | health_code_update(); | |
4482 | return 0; | |
4483 | ||
4484 | error_rcu_unlock: | |
4485 | pthread_mutex_unlock(&ua_sess->lock); | |
4486 | rcu_read_unlock(); | |
4487 | health_code_update(); | |
4488 | return -1; | |
4489 | } | |
4490 | ||
b34cbebf | 4491 | static |
c4b88406 MD |
4492 | int ust_app_flush_app_session(struct ust_app *app, |
4493 | struct ust_app_session *ua_sess) | |
b34cbebf | 4494 | { |
c4b88406 | 4495 | int ret, retval = 0; |
b34cbebf | 4496 | struct lttng_ht_iter iter; |
b34cbebf | 4497 | struct ust_app_channel *ua_chan; |
c4b88406 | 4498 | struct consumer_socket *socket; |
b34cbebf | 4499 | |
c4b88406 | 4500 | DBG("Flushing app session buffers for ust app pid %d", app->pid); |
b34cbebf MD |
4501 | |
4502 | rcu_read_lock(); | |
4503 | ||
4504 | if (!app->compatible) { | |
c4b88406 | 4505 | goto end_not_compatible; |
b34cbebf MD |
4506 | } |
4507 | ||
4508 | pthread_mutex_lock(&ua_sess->lock); | |
4509 | ||
b161602a MD |
4510 | if (ua_sess->deleted) { |
4511 | goto end_deleted; | |
4512 | } | |
4513 | ||
b34cbebf MD |
4514 | health_code_update(); |
4515 | ||
9d6c7d3f | 4516 | /* Flushing buffers */ |
c4b88406 MD |
4517 | socket = consumer_find_socket_by_bitness(app->bits_per_long, |
4518 | ua_sess->consumer); | |
ce34fcd0 MD |
4519 | |
4520 | /* Flush buffers and push metadata. */ | |
4521 | switch (ua_sess->buffer_type) { | |
4522 | case LTTNG_BUFFER_PER_PID: | |
4523 | cds_lfht_for_each_entry(ua_sess->channels->ht, &iter.iter, ua_chan, | |
4524 | node.node) { | |
4525 | health_code_update(); | |
ce34fcd0 MD |
4526 | ret = consumer_flush_channel(socket, ua_chan->key); |
4527 | if (ret) { | |
4528 | ERR("Error flushing consumer channel"); | |
4529 | retval = -1; | |
4530 | continue; | |
4531 | } | |
8be98f9a | 4532 | } |
ce34fcd0 MD |
4533 | break; |
4534 | case LTTNG_BUFFER_PER_UID: | |
4535 | default: | |
4536 | assert(0); | |
4537 | break; | |
8be98f9a | 4538 | } |
8be98f9a | 4539 | |
840cb59c | 4540 | health_code_update(); |
86acf0da | 4541 | |
b161602a | 4542 | end_deleted: |
d88aee68 | 4543 | pthread_mutex_unlock(&ua_sess->lock); |
ce34fcd0 | 4544 | |
c4b88406 MD |
4545 | end_not_compatible: |
4546 | rcu_read_unlock(); | |
4547 | health_code_update(); | |
4548 | return retval; | |
4549 | } | |
4550 | ||
4551 | /* | |
ce34fcd0 MD |
4552 | * Flush buffers for all applications for a specific UST session. |
4553 | * Called with UST session lock held. | |
c4b88406 MD |
4554 | */ |
4555 | static | |
ce34fcd0 | 4556 | int ust_app_flush_session(struct ltt_ust_session *usess) |
c4b88406 MD |
4557 | |
4558 | { | |
99b1411c | 4559 | int ret = 0; |
c4b88406 | 4560 | |
ce34fcd0 | 4561 | DBG("Flushing session buffers for all ust apps"); |
c4b88406 MD |
4562 | |
4563 | rcu_read_lock(); | |
4564 | ||
ce34fcd0 MD |
4565 | /* Flush buffers and push metadata. */ |
4566 | switch (usess->buffer_type) { | |
4567 | case LTTNG_BUFFER_PER_UID: | |
4568 | { | |
4569 | struct buffer_reg_uid *reg; | |
4570 | struct lttng_ht_iter iter; | |
4571 | ||
4572 | /* Flush all per UID buffers associated to that session. */ | |
4573 | cds_list_for_each_entry(reg, &usess->buffer_reg_uid_list, lnode) { | |
4574 | struct ust_registry_session *ust_session_reg; | |
4575 | struct buffer_reg_channel *reg_chan; | |
4576 | struct consumer_socket *socket; | |
4577 | ||
4578 | /* Get consumer socket to use to push the metadata.*/ | |
4579 | socket = consumer_find_socket_by_bitness(reg->bits_per_long, | |
4580 | usess->consumer); | |
4581 | if (!socket) { | |
4582 | /* Ignore request if no consumer is found for the session. */ | |
4583 | continue; | |
4584 | } | |
4585 | ||
4586 | cds_lfht_for_each_entry(reg->registry->channels->ht, &iter.iter, | |
4587 | reg_chan, node.node) { | |
4588 | /* | |
4589 | * The following call will print error values so the return | |
4590 | * code is of little importance because whatever happens, we | |
4591 | * have to try them all. | |
4592 | */ | |
4593 | (void) consumer_flush_channel(socket, reg_chan->consumer_key); | |
4594 | } | |
4595 | ||
4596 | ust_session_reg = reg->registry->reg.ust; | |
4597 | /* Push metadata. */ | |
4598 | (void) push_metadata(ust_session_reg, usess->consumer); | |
4599 | } | |
ce34fcd0 MD |
4600 | break; |
4601 | } | |
4602 | case LTTNG_BUFFER_PER_PID: | |
4603 | { | |
4604 | struct ust_app_session *ua_sess; | |
4605 | struct lttng_ht_iter iter; | |
4606 | struct ust_app *app; | |
4607 | ||
4608 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { | |
4609 | ua_sess = lookup_session_by_app(usess, app); | |
4610 | if (ua_sess == NULL) { | |
4611 | continue; | |
4612 | } | |
4613 | (void) ust_app_flush_app_session(app, ua_sess); | |
4614 | } | |
4615 | break; | |
4616 | } | |
4617 | default: | |
99b1411c | 4618 | ret = -1; |
ce34fcd0 MD |
4619 | assert(0); |
4620 | break; | |
c4b88406 | 4621 | } |
c4b88406 | 4622 | |
7db205b5 | 4623 | rcu_read_unlock(); |
840cb59c | 4624 | health_code_update(); |
c4b88406 | 4625 | return ret; |
8be98f9a MD |
4626 | } |
4627 | ||
84cd17c6 MD |
4628 | /* |
4629 | * Destroy a specific UST session in apps. | |
4630 | */ | |
3353de95 | 4631 | static int destroy_trace(struct ltt_ust_session *usess, struct ust_app *app) |
84cd17c6 | 4632 | { |
ffe60014 | 4633 | int ret; |
84cd17c6 | 4634 | struct ust_app_session *ua_sess; |
bec39940 | 4635 | struct lttng_ht_iter iter; |
d9bf3ca4 | 4636 | struct lttng_ht_node_u64 *node; |
84cd17c6 | 4637 | |
852d0037 | 4638 | DBG("Destroy tracing for ust app pid %d", app->pid); |
84cd17c6 MD |
4639 | |
4640 | rcu_read_lock(); | |
4641 | ||
e0c7ec2b DG |
4642 | if (!app->compatible) { |
4643 | goto end; | |
4644 | } | |
4645 | ||
84cd17c6 | 4646 | __lookup_session_by_app(usess, app, &iter); |
d9bf3ca4 | 4647 | node = lttng_ht_iter_get_node_u64(&iter); |
84cd17c6 | 4648 | if (node == NULL) { |
d42f20df DG |
4649 | /* Session is being or is deleted. */ |
4650 | goto end; | |
84cd17c6 MD |
4651 | } |
4652 | ua_sess = caa_container_of(node, struct ust_app_session, node); | |
c4a1715b | 4653 | |
840cb59c | 4654 | health_code_update(); |
d0b96690 | 4655 | destroy_app_session(app, ua_sess); |
84cd17c6 | 4656 | |
840cb59c | 4657 | health_code_update(); |
7db205b5 | 4658 | |
84cd17c6 | 4659 | /* Quiescent wait after stopping trace */ |
fb45065e | 4660 | pthread_mutex_lock(&app->sock_lock); |
ffe60014 | 4661 | ret = ustctl_wait_quiescent(app->sock); |
fb45065e | 4662 | pthread_mutex_unlock(&app->sock_lock); |
ffe60014 DG |
4663 | if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
4664 | ERR("UST app wait quiescent failed for app pid %d ret %d", | |
4665 | app->pid, ret); | |
4666 | } | |
e0c7ec2b DG |
4667 | end: |
4668 | rcu_read_unlock(); | |
840cb59c | 4669 | health_code_update(); |
84cd17c6 | 4670 | return 0; |
84cd17c6 MD |
4671 | } |
4672 | ||
5b4a0ec0 DG |
4673 | /* |
4674 | * Start tracing for the UST session. | |
4675 | */ | |
421cb601 DG |
4676 | int ust_app_start_trace_all(struct ltt_ust_session *usess) |
4677 | { | |
4678 | int ret = 0; | |
bec39940 | 4679 | struct lttng_ht_iter iter; |
421cb601 | 4680 | struct ust_app *app; |
48842b30 | 4681 | |
421cb601 DG |
4682 | DBG("Starting all UST traces"); |
4683 | ||
4684 | rcu_read_lock(); | |
421cb601 | 4685 | |
852d0037 | 4686 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
421cb601 | 4687 | ret = ust_app_start_trace(usess, app); |
48842b30 | 4688 | if (ret < 0) { |
5b4a0ec0 DG |
4689 | /* Continue to next apps even on error */ |
4690 | continue; | |
48842b30 | 4691 | } |
48842b30 | 4692 | } |
5b4a0ec0 | 4693 | |
48842b30 DG |
4694 | rcu_read_unlock(); |
4695 | ||
4696 | return 0; | |
4697 | } | |
487cf67c | 4698 | |
8be98f9a MD |
4699 | /* |
4700 | * Start tracing for the UST session. | |
ce34fcd0 | 4701 | * Called with UST session lock held. |
8be98f9a MD |
4702 | */ |
4703 | int ust_app_stop_trace_all(struct ltt_ust_session *usess) | |
4704 | { | |
4705 | int ret = 0; | |
bec39940 | 4706 | struct lttng_ht_iter iter; |
8be98f9a MD |
4707 | struct ust_app *app; |
4708 | ||
4709 | DBG("Stopping all UST traces"); | |
4710 | ||
4711 | rcu_read_lock(); | |
4712 | ||
b34cbebf MD |
4713 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
4714 | ret = ust_app_stop_trace(usess, app); | |
4715 | if (ret < 0) { | |
4716 | /* Continue to next apps even on error */ | |
4717 | continue; | |
4718 | } | |
4719 | } | |
4720 | ||
ce34fcd0 | 4721 | (void) ust_app_flush_session(usess); |
8be98f9a MD |
4722 | |
4723 | rcu_read_unlock(); | |
4724 | ||
4725 | return 0; | |
4726 | } | |
4727 | ||
84cd17c6 MD |
4728 | /* |
4729 | * Destroy app UST session. | |
4730 | */ | |
4731 | int ust_app_destroy_trace_all(struct ltt_ust_session *usess) | |
4732 | { | |
4733 | int ret = 0; | |
bec39940 | 4734 | struct lttng_ht_iter iter; |
84cd17c6 MD |
4735 | struct ust_app *app; |
4736 | ||
4737 | DBG("Destroy all UST traces"); | |
4738 | ||
4739 | rcu_read_lock(); | |
4740 | ||
852d0037 | 4741 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
3353de95 | 4742 | ret = destroy_trace(usess, app); |
84cd17c6 MD |
4743 | if (ret < 0) { |
4744 | /* Continue to next apps even on error */ | |
4745 | continue; | |
4746 | } | |
4747 | } | |
4748 | ||
4749 | rcu_read_unlock(); | |
4750 | ||
4751 | return 0; | |
4752 | } | |
4753 | ||
a9ad0c8f MD |
4754 | static |
4755 | void ust_app_global_create(struct ltt_ust_session *usess, struct ust_app *app) | |
487cf67c | 4756 | { |
55c54cce | 4757 | int ret = 0; |
31746f93 | 4758 | struct lttng_ht_iter iter, uiter; |
3d8ca23b | 4759 | struct ust_app_session *ua_sess = NULL; |
487cf67c DG |
4760 | struct ust_app_channel *ua_chan; |
4761 | struct ust_app_event *ua_event; | |
727d5404 | 4762 | struct ust_app_ctx *ua_ctx; |
a9ad0c8f | 4763 | int is_created = 0; |
1f3580c7 | 4764 | |
a9ad0c8f | 4765 | ret = create_ust_app_session(usess, app, &ua_sess, &is_created); |
3d8ca23b DG |
4766 | if (ret < 0) { |
4767 | /* Tracer is probably gone or ENOMEM. */ | |
487cf67c DG |
4768 | goto error; |
4769 | } | |
a9ad0c8f MD |
4770 | if (!is_created) { |
4771 | /* App session already created. */ | |
4772 | goto end; | |
4773 | } | |
3d8ca23b | 4774 | assert(ua_sess); |
487cf67c | 4775 | |
d0b96690 DG |
4776 | pthread_mutex_lock(&ua_sess->lock); |
4777 | ||
b161602a MD |
4778 | if (ua_sess->deleted) { |
4779 | pthread_mutex_unlock(&ua_sess->lock); | |
4780 | goto end; | |
4781 | } | |
4782 | ||
284d8f55 | 4783 | /* |
d0b96690 | 4784 | * We can iterate safely here over all UST app session since the create ust |
284d8f55 DG |
4785 | * app session above made a shadow copy of the UST global domain from the |
4786 | * ltt ust session. | |
4787 | */ | |
bec39940 DG |
4788 | cds_lfht_for_each_entry(ua_sess->channels->ht, &iter.iter, ua_chan, |
4789 | node.node) { | |
ad7a9107 | 4790 | ret = do_create_channel(app, usess, ua_sess, ua_chan); |
a7169585 | 4791 | if (ret < 0 && ret != -ENOTCONN) { |
ad7a9107 | 4792 | /* |
a7169585 MD |
4793 | * Stop everything. On error, the application |
4794 | * failed, no more file descriptor are available | |
4795 | * or ENOMEM so stopping here is the only thing | |
4796 | * we can do for now. The only exception is | |
4797 | * -ENOTCONN, which indicates that the application | |
4798 | * has exit. | |
ad7a9107 DG |
4799 | */ |
4800 | goto error_unlock; | |
487cf67c DG |
4801 | } |
4802 | ||
31746f93 DG |
4803 | /* |
4804 | * Add context using the list so they are enabled in the same order the | |
4805 | * user added them. | |
4806 | */ | |
4807 | cds_list_for_each_entry(ua_ctx, &ua_chan->ctx_list, list) { | |
727d5404 DG |
4808 | ret = create_ust_channel_context(ua_chan, ua_ctx, app); |
4809 | if (ret < 0) { | |
d0b96690 | 4810 | goto error_unlock; |
727d5404 DG |
4811 | } |
4812 | } | |
4813 | ||
4814 | ||
284d8f55 | 4815 | /* For each events */ |
bec39940 DG |
4816 | cds_lfht_for_each_entry(ua_chan->events->ht, &uiter.iter, ua_event, |
4817 | node.node) { | |
284d8f55 DG |
4818 | ret = create_ust_event(app, ua_sess, ua_chan, ua_event); |
4819 | if (ret < 0) { | |
d0b96690 | 4820 | goto error_unlock; |
487cf67c | 4821 | } |
36dc12cc | 4822 | } |
487cf67c DG |
4823 | } |
4824 | ||
d0b96690 DG |
4825 | pthread_mutex_unlock(&ua_sess->lock); |
4826 | ||
14fb1ebe | 4827 | if (usess->active) { |
421cb601 | 4828 | ret = ust_app_start_trace(usess, app); |
36dc12cc | 4829 | if (ret < 0) { |
36dc12cc DG |
4830 | goto error; |
4831 | } | |
4832 | ||
852d0037 | 4833 | DBG2("UST trace started for app pid %d", app->pid); |
36dc12cc | 4834 | } |
a9ad0c8f | 4835 | end: |
ffe60014 | 4836 | /* Everything went well at this point. */ |
ffe60014 DG |
4837 | return; |
4838 | ||
d0b96690 DG |
4839 | error_unlock: |
4840 | pthread_mutex_unlock(&ua_sess->lock); | |
487cf67c | 4841 | error: |
ffe60014 | 4842 | if (ua_sess) { |
d0b96690 | 4843 | destroy_app_session(app, ua_sess); |
ffe60014 | 4844 | } |
487cf67c DG |
4845 | return; |
4846 | } | |
55cc08a6 | 4847 | |
a9ad0c8f MD |
4848 | static |
4849 | void ust_app_global_destroy(struct ltt_ust_session *usess, struct ust_app *app) | |
4850 | { | |
4851 | struct ust_app_session *ua_sess; | |
4852 | ||
4853 | ua_sess = lookup_session_by_app(usess, app); | |
4854 | if (ua_sess == NULL) { | |
4855 | return; | |
4856 | } | |
4857 | destroy_app_session(app, ua_sess); | |
4858 | } | |
4859 | ||
4860 | /* | |
4861 | * Add channels/events from UST global domain to registered apps at sock. | |
4862 | * | |
4863 | * Called with session lock held. | |
4864 | * Called with RCU read-side lock held. | |
4865 | */ | |
4866 | void ust_app_global_update(struct ltt_ust_session *usess, struct ust_app *app) | |
4867 | { | |
4868 | assert(usess); | |
4869 | ||
4870 | DBG2("UST app global update for app sock %d for session id %" PRIu64, | |
4871 | app->sock, usess->id); | |
4872 | ||
4873 | if (!app->compatible) { | |
4874 | return; | |
4875 | } | |
4876 | ||
4877 | if (trace_ust_pid_tracker_lookup(usess, app->pid)) { | |
4878 | ust_app_global_create(usess, app); | |
4879 | } else { | |
4880 | ust_app_global_destroy(usess, app); | |
4881 | } | |
4882 | } | |
4883 | ||
4884 | /* | |
4885 | * Called with session lock held. | |
4886 | */ | |
4887 | void ust_app_global_update_all(struct ltt_ust_session *usess) | |
4888 | { | |
4889 | struct lttng_ht_iter iter; | |
4890 | struct ust_app *app; | |
4891 | ||
4892 | rcu_read_lock(); | |
4893 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { | |
4894 | ust_app_global_update(usess, app); | |
4895 | } | |
4896 | rcu_read_unlock(); | |
4897 | } | |
4898 | ||
55cc08a6 DG |
4899 | /* |
4900 | * Add context to a specific channel for global UST domain. | |
4901 | */ | |
4902 | int ust_app_add_ctx_channel_glb(struct ltt_ust_session *usess, | |
4903 | struct ltt_ust_channel *uchan, struct ltt_ust_context *uctx) | |
4904 | { | |
4905 | int ret = 0; | |
bec39940 DG |
4906 | struct lttng_ht_node_str *ua_chan_node; |
4907 | struct lttng_ht_iter iter, uiter; | |
55cc08a6 DG |
4908 | struct ust_app_channel *ua_chan = NULL; |
4909 | struct ust_app_session *ua_sess; | |
4910 | struct ust_app *app; | |
4911 | ||
4912 | rcu_read_lock(); | |
4913 | ||
852d0037 | 4914 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
e0c7ec2b DG |
4915 | if (!app->compatible) { |
4916 | /* | |
4917 | * TODO: In time, we should notice the caller of this error by | |
4918 | * telling him that this is a version error. | |
4919 | */ | |
4920 | continue; | |
4921 | } | |
55cc08a6 DG |
4922 | ua_sess = lookup_session_by_app(usess, app); |
4923 | if (ua_sess == NULL) { | |
4924 | continue; | |
4925 | } | |
4926 | ||
d0b96690 | 4927 | pthread_mutex_lock(&ua_sess->lock); |
b161602a MD |
4928 | |
4929 | if (ua_sess->deleted) { | |
4930 | pthread_mutex_unlock(&ua_sess->lock); | |
4931 | continue; | |
4932 | } | |
4933 | ||
55cc08a6 | 4934 | /* Lookup channel in the ust app session */ |
bec39940 DG |
4935 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter); |
4936 | ua_chan_node = lttng_ht_iter_get_node_str(&uiter); | |
55cc08a6 | 4937 | if (ua_chan_node == NULL) { |
d0b96690 | 4938 | goto next_app; |
55cc08a6 DG |
4939 | } |
4940 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, | |
4941 | node); | |
55cc08a6 DG |
4942 | ret = create_ust_app_channel_context(ua_sess, ua_chan, &uctx->ctx, app); |
4943 | if (ret < 0) { | |
d0b96690 | 4944 | goto next_app; |
55cc08a6 | 4945 | } |
d0b96690 DG |
4946 | next_app: |
4947 | pthread_mutex_unlock(&ua_sess->lock); | |
55cc08a6 DG |
4948 | } |
4949 | ||
55cc08a6 DG |
4950 | rcu_read_unlock(); |
4951 | return ret; | |
4952 | } | |
4953 | ||
76d45b40 DG |
4954 | /* |
4955 | * Enable event for a channel from a UST session for a specific PID. | |
4956 | */ | |
4957 | int ust_app_enable_event_pid(struct ltt_ust_session *usess, | |
4958 | struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent, pid_t pid) | |
4959 | { | |
4960 | int ret = 0; | |
bec39940 | 4961 | struct lttng_ht_iter iter; |
18eace3b | 4962 | struct lttng_ht_node_str *ua_chan_node; |
76d45b40 DG |
4963 | struct ust_app *app; |
4964 | struct ust_app_session *ua_sess; | |
4965 | struct ust_app_channel *ua_chan; | |
4966 | struct ust_app_event *ua_event; | |
4967 | ||
4968 | DBG("UST app enabling event %s for PID %d", uevent->attr.name, pid); | |
4969 | ||
4970 | rcu_read_lock(); | |
4971 | ||
4972 | app = ust_app_find_by_pid(pid); | |
4973 | if (app == NULL) { | |
4974 | ERR("UST app enable event per PID %d not found", pid); | |
4975 | ret = -1; | |
d0b96690 | 4976 | goto end; |
76d45b40 DG |
4977 | } |
4978 | ||
e0c7ec2b DG |
4979 | if (!app->compatible) { |
4980 | ret = 0; | |
d0b96690 | 4981 | goto end; |
e0c7ec2b DG |
4982 | } |
4983 | ||
76d45b40 | 4984 | ua_sess = lookup_session_by_app(usess, app); |
c4a1715b DG |
4985 | if (!ua_sess) { |
4986 | /* The application has problem or is probably dead. */ | |
d0b96690 DG |
4987 | ret = 0; |
4988 | goto end; | |
c4a1715b | 4989 | } |
76d45b40 | 4990 | |
d0b96690 | 4991 | pthread_mutex_lock(&ua_sess->lock); |
b161602a MD |
4992 | |
4993 | if (ua_sess->deleted) { | |
4994 | ret = 0; | |
4995 | goto end_unlock; | |
4996 | } | |
4997 | ||
76d45b40 | 4998 | /* Lookup channel in the ust app session */ |
bec39940 DG |
4999 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &iter); |
5000 | ua_chan_node = lttng_ht_iter_get_node_str(&iter); | |
76d45b40 DG |
5001 | /* If the channel is not found, there is a code flow error */ |
5002 | assert(ua_chan_node); | |
5003 | ||
5004 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); | |
5005 | ||
18eace3b | 5006 | ua_event = find_ust_app_event(ua_chan->events, uevent->attr.name, |
39c5a3a7 | 5007 | uevent->filter, uevent->attr.loglevel, uevent->exclusion); |
18eace3b | 5008 | if (ua_event == NULL) { |
76d45b40 DG |
5009 | ret = create_ust_app_event(ua_sess, ua_chan, uevent, app); |
5010 | if (ret < 0) { | |
d0b96690 | 5011 | goto end_unlock; |
76d45b40 DG |
5012 | } |
5013 | } else { | |
76d45b40 DG |
5014 | ret = enable_ust_app_event(ua_sess, ua_event, app); |
5015 | if (ret < 0) { | |
d0b96690 | 5016 | goto end_unlock; |
76d45b40 DG |
5017 | } |
5018 | } | |
5019 | ||
d0b96690 DG |
5020 | end_unlock: |
5021 | pthread_mutex_unlock(&ua_sess->lock); | |
5022 | end: | |
76d45b40 DG |
5023 | rcu_read_unlock(); |
5024 | return ret; | |
5025 | } | |
7f79d3a1 | 5026 | |
4466912f DG |
5027 | /* |
5028 | * Calibrate registered applications. | |
5029 | */ | |
5030 | int ust_app_calibrate_glb(struct lttng_ust_calibrate *calibrate) | |
5031 | { | |
5032 | int ret = 0; | |
5033 | struct lttng_ht_iter iter; | |
5034 | struct ust_app *app; | |
5035 | ||
5036 | rcu_read_lock(); | |
5037 | ||
852d0037 | 5038 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
4466912f DG |
5039 | if (!app->compatible) { |
5040 | /* | |
5041 | * TODO: In time, we should notice the caller of this error by | |
5042 | * telling him that this is a version error. | |
5043 | */ | |
5044 | continue; | |
5045 | } | |
5046 | ||
840cb59c | 5047 | health_code_update(); |
86acf0da | 5048 | |
fb45065e | 5049 | pthread_mutex_lock(&app->sock_lock); |
852d0037 | 5050 | ret = ustctl_calibrate(app->sock, calibrate); |
fb45065e | 5051 | pthread_mutex_unlock(&app->sock_lock); |
4466912f DG |
5052 | if (ret < 0) { |
5053 | switch (ret) { | |
5054 | case -ENOSYS: | |
5055 | /* Means that it's not implemented on the tracer side. */ | |
5056 | ret = 0; | |
5057 | break; | |
5058 | default: | |
4466912f | 5059 | DBG2("Calibrate app PID %d returned with error %d", |
852d0037 | 5060 | app->pid, ret); |
4466912f DG |
5061 | break; |
5062 | } | |
5063 | } | |
5064 | } | |
5065 | ||
5066 | DBG("UST app global domain calibration finished"); | |
5067 | ||
5068 | rcu_read_unlock(); | |
5069 | ||
840cb59c | 5070 | health_code_update(); |
86acf0da | 5071 | |
4466912f DG |
5072 | return ret; |
5073 | } | |
d0b96690 DG |
5074 | |
5075 | /* | |
5076 | * Receive registration and populate the given msg structure. | |
5077 | * | |
5078 | * On success return 0 else a negative value returned by the ustctl call. | |
5079 | */ | |
5080 | int ust_app_recv_registration(int sock, struct ust_register_msg *msg) | |
5081 | { | |
5082 | int ret; | |
5083 | uint32_t pid, ppid, uid, gid; | |
5084 | ||
5085 | assert(msg); | |
5086 | ||
5087 | ret = ustctl_recv_reg_msg(sock, &msg->type, &msg->major, &msg->minor, | |
5088 | &pid, &ppid, &uid, &gid, | |
5089 | &msg->bits_per_long, | |
5090 | &msg->uint8_t_alignment, | |
5091 | &msg->uint16_t_alignment, | |
5092 | &msg->uint32_t_alignment, | |
5093 | &msg->uint64_t_alignment, | |
5094 | &msg->long_alignment, | |
5095 | &msg->byte_order, | |
5096 | msg->name); | |
5097 | if (ret < 0) { | |
5098 | switch (-ret) { | |
5099 | case EPIPE: | |
5100 | case ECONNRESET: | |
5101 | case LTTNG_UST_ERR_EXITING: | |
5102 | DBG3("UST app recv reg message failed. Application died"); | |
5103 | break; | |
5104 | case LTTNG_UST_ERR_UNSUP_MAJOR: | |
5105 | ERR("UST app recv reg unsupported version %d.%d. Supporting %d.%d", | |
5106 | msg->major, msg->minor, LTTNG_UST_ABI_MAJOR_VERSION, | |
5107 | LTTNG_UST_ABI_MINOR_VERSION); | |
5108 | break; | |
5109 | default: | |
5110 | ERR("UST app recv reg message failed with ret %d", ret); | |
5111 | break; | |
5112 | } | |
5113 | goto error; | |
5114 | } | |
5115 | msg->pid = (pid_t) pid; | |
5116 | msg->ppid = (pid_t) ppid; | |
5117 | msg->uid = (uid_t) uid; | |
5118 | msg->gid = (gid_t) gid; | |
5119 | ||
5120 | error: | |
5121 | return ret; | |
5122 | } | |
5123 | ||
10b56aef MD |
5124 | /* |
5125 | * Return a ust app session object using the application object and the | |
5126 | * session object descriptor has a key. If not found, NULL is returned. | |
5127 | * A RCU read side lock MUST be acquired when calling this function. | |
5128 | */ | |
5129 | static struct ust_app_session *find_session_by_objd(struct ust_app *app, | |
5130 | int objd) | |
5131 | { | |
5132 | struct lttng_ht_node_ulong *node; | |
5133 | struct lttng_ht_iter iter; | |
5134 | struct ust_app_session *ua_sess = NULL; | |
5135 | ||
5136 | assert(app); | |
5137 | ||
5138 | lttng_ht_lookup(app->ust_sessions_objd, (void *)((unsigned long) objd), &iter); | |
5139 | node = lttng_ht_iter_get_node_ulong(&iter); | |
5140 | if (node == NULL) { | |
5141 | DBG2("UST app session find by objd %d not found", objd); | |
5142 | goto error; | |
5143 | } | |
5144 | ||
5145 | ua_sess = caa_container_of(node, struct ust_app_session, ust_objd_node); | |
5146 | ||
5147 | error: | |
5148 | return ua_sess; | |
5149 | } | |
5150 | ||
d88aee68 DG |
5151 | /* |
5152 | * Return a ust app channel object using the application object and the channel | |
5153 | * object descriptor has a key. If not found, NULL is returned. A RCU read side | |
5154 | * lock MUST be acquired before calling this function. | |
5155 | */ | |
d0b96690 DG |
5156 | static struct ust_app_channel *find_channel_by_objd(struct ust_app *app, |
5157 | int objd) | |
5158 | { | |
5159 | struct lttng_ht_node_ulong *node; | |
5160 | struct lttng_ht_iter iter; | |
5161 | struct ust_app_channel *ua_chan = NULL; | |
5162 | ||
5163 | assert(app); | |
5164 | ||
5165 | lttng_ht_lookup(app->ust_objd, (void *)((unsigned long) objd), &iter); | |
5166 | node = lttng_ht_iter_get_node_ulong(&iter); | |
5167 | if (node == NULL) { | |
5168 | DBG2("UST app channel find by objd %d not found", objd); | |
5169 | goto error; | |
5170 | } | |
5171 | ||
5172 | ua_chan = caa_container_of(node, struct ust_app_channel, ust_objd_node); | |
5173 | ||
5174 | error: | |
5175 | return ua_chan; | |
5176 | } | |
5177 | ||
d88aee68 DG |
5178 | /* |
5179 | * Reply to a register channel notification from an application on the notify | |
5180 | * socket. The channel metadata is also created. | |
5181 | * | |
5182 | * The session UST registry lock is acquired in this function. | |
5183 | * | |
5184 | * On success 0 is returned else a negative value. | |
5185 | */ | |
d0b96690 DG |
5186 | static int reply_ust_register_channel(int sock, int sobjd, int cobjd, |
5187 | size_t nr_fields, struct ustctl_field *fields) | |
5188 | { | |
5189 | int ret, ret_code = 0; | |
5190 | uint32_t chan_id, reg_count; | |
7972aab2 | 5191 | uint64_t chan_reg_key; |
d0b96690 DG |
5192 | enum ustctl_channel_header type; |
5193 | struct ust_app *app; | |
5194 | struct ust_app_channel *ua_chan; | |
5195 | struct ust_app_session *ua_sess; | |
7972aab2 | 5196 | struct ust_registry_session *registry; |
45893984 | 5197 | struct ust_registry_channel *chan_reg; |
d0b96690 DG |
5198 | |
5199 | rcu_read_lock(); | |
5200 | ||
5201 | /* Lookup application. If not found, there is a code flow error. */ | |
5202 | app = find_app_by_notify_sock(sock); | |
d88aee68 DG |
5203 | if (!app) { |
5204 | DBG("Application socket %d is being teardown. Abort event notify", | |
5205 | sock); | |
5206 | ret = 0; | |
d5d629b5 | 5207 | free(fields); |
d88aee68 DG |
5208 | goto error_rcu_unlock; |
5209 | } | |
d0b96690 | 5210 | |
4950b860 | 5211 | /* Lookup channel by UST object descriptor. */ |
d0b96690 | 5212 | ua_chan = find_channel_by_objd(app, cobjd); |
4950b860 MD |
5213 | if (!ua_chan) { |
5214 | DBG("Application channel is being teardown. Abort event notify"); | |
5215 | ret = 0; | |
d5d629b5 | 5216 | free(fields); |
4950b860 MD |
5217 | goto error_rcu_unlock; |
5218 | } | |
5219 | ||
d0b96690 DG |
5220 | assert(ua_chan->session); |
5221 | ua_sess = ua_chan->session; | |
d0b96690 | 5222 | |
7972aab2 DG |
5223 | /* Get right session registry depending on the session buffer type. */ |
5224 | registry = get_session_registry(ua_sess); | |
5225 | assert(registry); | |
45893984 | 5226 | |
7972aab2 DG |
5227 | /* Depending on the buffer type, a different channel key is used. */ |
5228 | if (ua_sess->buffer_type == LTTNG_BUFFER_PER_UID) { | |
5229 | chan_reg_key = ua_chan->tracing_channel_id; | |
d0b96690 | 5230 | } else { |
7972aab2 | 5231 | chan_reg_key = ua_chan->key; |
d0b96690 DG |
5232 | } |
5233 | ||
7972aab2 DG |
5234 | pthread_mutex_lock(®istry->lock); |
5235 | ||
5236 | chan_reg = ust_registry_channel_find(registry, chan_reg_key); | |
5237 | assert(chan_reg); | |
5238 | ||
5239 | if (!chan_reg->register_done) { | |
5240 | reg_count = ust_registry_get_event_count(chan_reg); | |
5241 | if (reg_count < 31) { | |
5242 | type = USTCTL_CHANNEL_HEADER_COMPACT; | |
5243 | } else { | |
5244 | type = USTCTL_CHANNEL_HEADER_LARGE; | |
5245 | } | |
5246 | ||
5247 | chan_reg->nr_ctx_fields = nr_fields; | |
5248 | chan_reg->ctx_fields = fields; | |
5249 | chan_reg->header_type = type; | |
d0b96690 | 5250 | } else { |
7972aab2 DG |
5251 | /* Get current already assigned values. */ |
5252 | type = chan_reg->header_type; | |
d5d629b5 DG |
5253 | free(fields); |
5254 | /* Set to NULL so the error path does not do a double free. */ | |
5255 | fields = NULL; | |
d0b96690 | 5256 | } |
7972aab2 DG |
5257 | /* Channel id is set during the object creation. */ |
5258 | chan_id = chan_reg->chan_id; | |
d0b96690 DG |
5259 | |
5260 | /* Append to metadata */ | |
7972aab2 DG |
5261 | if (!chan_reg->metadata_dumped) { |
5262 | ret_code = ust_metadata_channel_statedump(registry, chan_reg); | |
d0b96690 DG |
5263 | if (ret_code) { |
5264 | ERR("Error appending channel metadata (errno = %d)", ret_code); | |
5265 | goto reply; | |
5266 | } | |
5267 | } | |
5268 | ||
5269 | reply: | |
7972aab2 DG |
5270 | DBG3("UST app replying to register channel key %" PRIu64 |
5271 | " with id %u, type: %d, ret: %d", chan_reg_key, chan_id, type, | |
5272 | ret_code); | |
d0b96690 DG |
5273 | |
5274 | ret = ustctl_reply_register_channel(sock, chan_id, type, ret_code); | |
5275 | if (ret < 0) { | |
5276 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
5277 | ERR("UST app reply channel failed with ret %d", ret); | |
5278 | } else { | |
5279 | DBG3("UST app reply channel failed. Application died"); | |
5280 | } | |
5281 | goto error; | |
5282 | } | |
5283 | ||
7972aab2 DG |
5284 | /* This channel registry registration is completed. */ |
5285 | chan_reg->register_done = 1; | |
5286 | ||
d0b96690 | 5287 | error: |
7972aab2 | 5288 | pthread_mutex_unlock(®istry->lock); |
d88aee68 | 5289 | error_rcu_unlock: |
d0b96690 | 5290 | rcu_read_unlock(); |
d5d629b5 DG |
5291 | if (ret) { |
5292 | free(fields); | |
5293 | } | |
d0b96690 DG |
5294 | return ret; |
5295 | } | |
5296 | ||
d88aee68 DG |
5297 | /* |
5298 | * Add event to the UST channel registry. When the event is added to the | |
5299 | * registry, the metadata is also created. Once done, this replies to the | |
5300 | * application with the appropriate error code. | |
5301 | * | |
5302 | * The session UST registry lock is acquired in the function. | |
5303 | * | |
5304 | * On success 0 is returned else a negative value. | |
5305 | */ | |
d0b96690 | 5306 | static int add_event_ust_registry(int sock, int sobjd, int cobjd, char *name, |
2106efa0 PP |
5307 | char *sig, size_t nr_fields, struct ustctl_field *fields, |
5308 | int loglevel_value, char *model_emf_uri) | |
d0b96690 DG |
5309 | { |
5310 | int ret, ret_code; | |
5311 | uint32_t event_id = 0; | |
7972aab2 | 5312 | uint64_t chan_reg_key; |
d0b96690 DG |
5313 | struct ust_app *app; |
5314 | struct ust_app_channel *ua_chan; | |
5315 | struct ust_app_session *ua_sess; | |
7972aab2 | 5316 | struct ust_registry_session *registry; |
d0b96690 DG |
5317 | |
5318 | rcu_read_lock(); | |
5319 | ||
5320 | /* Lookup application. If not found, there is a code flow error. */ | |
5321 | app = find_app_by_notify_sock(sock); | |
d88aee68 DG |
5322 | if (!app) { |
5323 | DBG("Application socket %d is being teardown. Abort event notify", | |
5324 | sock); | |
5325 | ret = 0; | |
d5d629b5 DG |
5326 | free(sig); |
5327 | free(fields); | |
5328 | free(model_emf_uri); | |
d88aee68 DG |
5329 | goto error_rcu_unlock; |
5330 | } | |
d0b96690 | 5331 | |
4950b860 | 5332 | /* Lookup channel by UST object descriptor. */ |
d0b96690 | 5333 | ua_chan = find_channel_by_objd(app, cobjd); |
4950b860 MD |
5334 | if (!ua_chan) { |
5335 | DBG("Application channel is being teardown. Abort event notify"); | |
5336 | ret = 0; | |
d5d629b5 DG |
5337 | free(sig); |
5338 | free(fields); | |
5339 | free(model_emf_uri); | |
4950b860 MD |
5340 | goto error_rcu_unlock; |
5341 | } | |
5342 | ||
d0b96690 DG |
5343 | assert(ua_chan->session); |
5344 | ua_sess = ua_chan->session; | |
5345 | ||
7972aab2 DG |
5346 | registry = get_session_registry(ua_sess); |
5347 | assert(registry); | |
5348 | ||
5349 | if (ua_sess->buffer_type == LTTNG_BUFFER_PER_UID) { | |
5350 | chan_reg_key = ua_chan->tracing_channel_id; | |
5351 | } else { | |
5352 | chan_reg_key = ua_chan->key; | |
5353 | } | |
5354 | ||
5355 | pthread_mutex_lock(®istry->lock); | |
d0b96690 | 5356 | |
d5d629b5 DG |
5357 | /* |
5358 | * From this point on, this call acquires the ownership of the sig, fields | |
5359 | * and model_emf_uri meaning any free are done inside it if needed. These | |
5360 | * three variables MUST NOT be read/write after this. | |
5361 | */ | |
7972aab2 | 5362 | ret_code = ust_registry_create_event(registry, chan_reg_key, |
2106efa0 PP |
5363 | sobjd, cobjd, name, sig, nr_fields, fields, |
5364 | loglevel_value, model_emf_uri, ua_sess->buffer_type, | |
5365 | &event_id, app); | |
d0b96690 DG |
5366 | |
5367 | /* | |
5368 | * The return value is returned to ustctl so in case of an error, the | |
5369 | * application can be notified. In case of an error, it's important not to | |
5370 | * return a negative error or else the application will get closed. | |
5371 | */ | |
5372 | ret = ustctl_reply_register_event(sock, event_id, ret_code); | |
5373 | if (ret < 0) { | |
5374 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
5375 | ERR("UST app reply event failed with ret %d", ret); | |
5376 | } else { | |
5377 | DBG3("UST app reply event failed. Application died"); | |
5378 | } | |
5379 | /* | |
5380 | * No need to wipe the create event since the application socket will | |
5381 | * get close on error hence cleaning up everything by itself. | |
5382 | */ | |
5383 | goto error; | |
5384 | } | |
5385 | ||
7972aab2 DG |
5386 | DBG3("UST registry event %s with id %" PRId32 " added successfully", |
5387 | name, event_id); | |
d88aee68 | 5388 | |
d0b96690 | 5389 | error: |
7972aab2 | 5390 | pthread_mutex_unlock(®istry->lock); |
d88aee68 | 5391 | error_rcu_unlock: |
d0b96690 DG |
5392 | rcu_read_unlock(); |
5393 | return ret; | |
5394 | } | |
5395 | ||
10b56aef MD |
5396 | /* |
5397 | * Add enum to the UST session registry. Once done, this replies to the | |
5398 | * application with the appropriate error code. | |
5399 | * | |
5400 | * The session UST registry lock is acquired within this function. | |
5401 | * | |
5402 | * On success 0 is returned else a negative value. | |
5403 | */ | |
5404 | static int add_enum_ust_registry(int sock, int sobjd, char *name, | |
5405 | struct ustctl_enum_entry *entries, size_t nr_entries) | |
5406 | { | |
5407 | int ret = 0, ret_code; | |
5408 | struct ust_app *app; | |
5409 | struct ust_app_session *ua_sess; | |
5410 | struct ust_registry_session *registry; | |
5411 | uint64_t enum_id = -1ULL; | |
5412 | ||
5413 | rcu_read_lock(); | |
5414 | ||
5415 | /* Lookup application. If not found, there is a code flow error. */ | |
5416 | app = find_app_by_notify_sock(sock); | |
5417 | if (!app) { | |
5418 | /* Return an error since this is not an error */ | |
5419 | DBG("Application socket %d is being torn down. Aborting enum registration", | |
5420 | sock); | |
5421 | free(entries); | |
5422 | goto error_rcu_unlock; | |
5423 | } | |
5424 | ||
5425 | /* Lookup session by UST object descriptor. */ | |
5426 | ua_sess = find_session_by_objd(app, sobjd); | |
5427 | if (!ua_sess) { | |
5428 | /* Return an error since this is not an error */ | |
5429 | DBG("Application session is being torn down. Aborting enum registration."); | |
5430 | free(entries); | |
5431 | goto error_rcu_unlock; | |
5432 | } | |
5433 | ||
5434 | registry = get_session_registry(ua_sess); | |
5435 | assert(registry); | |
5436 | ||
5437 | pthread_mutex_lock(®istry->lock); | |
5438 | ||
5439 | /* | |
5440 | * From this point on, the callee acquires the ownership of | |
5441 | * entries. The variable entries MUST NOT be read/written after | |
5442 | * call. | |
5443 | */ | |
5444 | ret_code = ust_registry_create_or_find_enum(registry, sobjd, name, | |
5445 | entries, nr_entries, &enum_id); | |
5446 | entries = NULL; | |
5447 | ||
5448 | /* | |
5449 | * The return value is returned to ustctl so in case of an error, the | |
5450 | * application can be notified. In case of an error, it's important not to | |
5451 | * return a negative error or else the application will get closed. | |
5452 | */ | |
5453 | ret = ustctl_reply_register_enum(sock, enum_id, ret_code); | |
5454 | if (ret < 0) { | |
5455 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
5456 | ERR("UST app reply enum failed with ret %d", ret); | |
5457 | } else { | |
5458 | DBG3("UST app reply enum failed. Application died"); | |
5459 | } | |
5460 | /* | |
5461 | * No need to wipe the create enum since the application socket will | |
5462 | * get close on error hence cleaning up everything by itself. | |
5463 | */ | |
5464 | goto error; | |
5465 | } | |
5466 | ||
5467 | DBG3("UST registry enum %s added successfully or already found", name); | |
5468 | ||
5469 | error: | |
5470 | pthread_mutex_unlock(®istry->lock); | |
5471 | error_rcu_unlock: | |
5472 | rcu_read_unlock(); | |
5473 | return ret; | |
5474 | } | |
5475 | ||
d88aee68 DG |
5476 | /* |
5477 | * Handle application notification through the given notify socket. | |
5478 | * | |
5479 | * Return 0 on success or else a negative value. | |
5480 | */ | |
d0b96690 DG |
5481 | int ust_app_recv_notify(int sock) |
5482 | { | |
5483 | int ret; | |
5484 | enum ustctl_notify_cmd cmd; | |
5485 | ||
5486 | DBG3("UST app receiving notify from sock %d", sock); | |
5487 | ||
5488 | ret = ustctl_recv_notify(sock, &cmd); | |
5489 | if (ret < 0) { | |
5490 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
5491 | ERR("UST app recv notify failed with ret %d", ret); | |
5492 | } else { | |
5493 | DBG3("UST app recv notify failed. Application died"); | |
5494 | } | |
5495 | goto error; | |
5496 | } | |
5497 | ||
5498 | switch (cmd) { | |
5499 | case USTCTL_NOTIFY_CMD_EVENT: | |
5500 | { | |
2106efa0 | 5501 | int sobjd, cobjd, loglevel_value; |
d0b96690 DG |
5502 | char name[LTTNG_UST_SYM_NAME_LEN], *sig, *model_emf_uri; |
5503 | size_t nr_fields; | |
5504 | struct ustctl_field *fields; | |
5505 | ||
5506 | DBG2("UST app ustctl register event received"); | |
5507 | ||
2106efa0 PP |
5508 | ret = ustctl_recv_register_event(sock, &sobjd, &cobjd, name, |
5509 | &loglevel_value, &sig, &nr_fields, &fields, | |
5510 | &model_emf_uri); | |
d0b96690 DG |
5511 | if (ret < 0) { |
5512 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
5513 | ERR("UST app recv event failed with ret %d", ret); | |
5514 | } else { | |
5515 | DBG3("UST app recv event failed. Application died"); | |
5516 | } | |
5517 | goto error; | |
5518 | } | |
5519 | ||
d5d629b5 DG |
5520 | /* |
5521 | * Add event to the UST registry coming from the notify socket. This | |
5522 | * call will free if needed the sig, fields and model_emf_uri. This | |
5523 | * code path loses the ownsership of these variables and transfer them | |
5524 | * to the this function. | |
5525 | */ | |
d0b96690 | 5526 | ret = add_event_ust_registry(sock, sobjd, cobjd, name, sig, nr_fields, |
2106efa0 | 5527 | fields, loglevel_value, model_emf_uri); |
d0b96690 DG |
5528 | if (ret < 0) { |
5529 | goto error; | |
5530 | } | |
5531 | ||
5532 | break; | |
5533 | } | |
5534 | case USTCTL_NOTIFY_CMD_CHANNEL: | |
5535 | { | |
5536 | int sobjd, cobjd; | |
5537 | size_t nr_fields; | |
5538 | struct ustctl_field *fields; | |
5539 | ||
5540 | DBG2("UST app ustctl register channel received"); | |
5541 | ||
5542 | ret = ustctl_recv_register_channel(sock, &sobjd, &cobjd, &nr_fields, | |
5543 | &fields); | |
5544 | if (ret < 0) { | |
5545 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
5546 | ERR("UST app recv channel failed with ret %d", ret); | |
5547 | } else { | |
5548 | DBG3("UST app recv channel failed. Application died"); | |
5549 | } | |
5550 | goto error; | |
5551 | } | |
5552 | ||
d5d629b5 DG |
5553 | /* |
5554 | * The fields ownership are transfered to this function call meaning | |
5555 | * that if needed it will be freed. After this, it's invalid to access | |
5556 | * fields or clean it up. | |
5557 | */ | |
d0b96690 DG |
5558 | ret = reply_ust_register_channel(sock, sobjd, cobjd, nr_fields, |
5559 | fields); | |
5560 | if (ret < 0) { | |
5561 | goto error; | |
5562 | } | |
5563 | ||
5564 | break; | |
5565 | } | |
10b56aef MD |
5566 | case USTCTL_NOTIFY_CMD_ENUM: |
5567 | { | |
5568 | int sobjd; | |
5569 | char name[LTTNG_UST_SYM_NAME_LEN]; | |
5570 | size_t nr_entries; | |
5571 | struct ustctl_enum_entry *entries; | |
5572 | ||
5573 | DBG2("UST app ustctl register enum received"); | |
5574 | ||
5575 | ret = ustctl_recv_register_enum(sock, &sobjd, name, | |
5576 | &entries, &nr_entries); | |
5577 | if (ret < 0) { | |
5578 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
5579 | ERR("UST app recv enum failed with ret %d", ret); | |
5580 | } else { | |
5581 | DBG3("UST app recv enum failed. Application died"); | |
5582 | } | |
5583 | goto error; | |
5584 | } | |
5585 | ||
5586 | /* Callee assumes ownership of entries */ | |
5587 | ret = add_enum_ust_registry(sock, sobjd, name, | |
5588 | entries, nr_entries); | |
5589 | if (ret < 0) { | |
5590 | goto error; | |
5591 | } | |
5592 | ||
5593 | break; | |
5594 | } | |
d0b96690 DG |
5595 | default: |
5596 | /* Should NEVER happen. */ | |
5597 | assert(0); | |
5598 | } | |
5599 | ||
5600 | error: | |
5601 | return ret; | |
5602 | } | |
d88aee68 DG |
5603 | |
5604 | /* | |
5605 | * Once the notify socket hangs up, this is called. First, it tries to find the | |
5606 | * corresponding application. On failure, the call_rcu to close the socket is | |
5607 | * executed. If an application is found, it tries to delete it from the notify | |
5608 | * socket hash table. Whathever the result, it proceeds to the call_rcu. | |
5609 | * | |
5610 | * Note that an object needs to be allocated here so on ENOMEM failure, the | |
5611 | * call RCU is not done but the rest of the cleanup is. | |
5612 | */ | |
5613 | void ust_app_notify_sock_unregister(int sock) | |
5614 | { | |
5615 | int err_enomem = 0; | |
5616 | struct lttng_ht_iter iter; | |
5617 | struct ust_app *app; | |
5618 | struct ust_app_notify_sock_obj *obj; | |
5619 | ||
5620 | assert(sock >= 0); | |
5621 | ||
5622 | rcu_read_lock(); | |
5623 | ||
5624 | obj = zmalloc(sizeof(*obj)); | |
5625 | if (!obj) { | |
5626 | /* | |
5627 | * An ENOMEM is kind of uncool. If this strikes we continue the | |
5628 | * procedure but the call_rcu will not be called. In this case, we | |
5629 | * accept the fd leak rather than possibly creating an unsynchronized | |
5630 | * state between threads. | |
5631 | * | |
5632 | * TODO: The notify object should be created once the notify socket is | |
5633 | * registered and stored independantely from the ust app object. The | |
5634 | * tricky part is to synchronize the teardown of the application and | |
5635 | * this notify object. Let's keep that in mind so we can avoid this | |
5636 | * kind of shenanigans with ENOMEM in the teardown path. | |
5637 | */ | |
5638 | err_enomem = 1; | |
5639 | } else { | |
5640 | obj->fd = sock; | |
5641 | } | |
5642 | ||
5643 | DBG("UST app notify socket unregister %d", sock); | |
5644 | ||
5645 | /* | |
5646 | * Lookup application by notify socket. If this fails, this means that the | |
5647 | * hash table delete has already been done by the application | |
5648 | * unregistration process so we can safely close the notify socket in a | |
5649 | * call RCU. | |
5650 | */ | |
5651 | app = find_app_by_notify_sock(sock); | |
5652 | if (!app) { | |
5653 | goto close_socket; | |
5654 | } | |
5655 | ||
5656 | iter.iter.node = &app->notify_sock_n.node; | |
5657 | ||
5658 | /* | |
5659 | * Whatever happens here either we fail or succeed, in both cases we have | |
5660 | * to close the socket after a grace period to continue to the call RCU | |
5661 | * here. If the deletion is successful, the application is not visible | |
5662 | * anymore by other threads and is it fails it means that it was already | |
5663 | * deleted from the hash table so either way we just have to close the | |
5664 | * socket. | |
5665 | */ | |
5666 | (void) lttng_ht_del(ust_app_ht_by_notify_sock, &iter); | |
5667 | ||
5668 | close_socket: | |
5669 | rcu_read_unlock(); | |
5670 | ||
5671 | /* | |
5672 | * Close socket after a grace period to avoid for the socket to be reused | |
5673 | * before the application object is freed creating potential race between | |
5674 | * threads trying to add unique in the global hash table. | |
5675 | */ | |
5676 | if (!err_enomem) { | |
5677 | call_rcu(&obj->head, close_notify_sock_rcu); | |
5678 | } | |
5679 | } | |
f45e313d DG |
5680 | |
5681 | /* | |
5682 | * Destroy a ust app data structure and free its memory. | |
5683 | */ | |
5684 | void ust_app_destroy(struct ust_app *app) | |
5685 | { | |
5686 | if (!app) { | |
5687 | return; | |
5688 | } | |
5689 | ||
5690 | call_rcu(&app->pid_n.head, delete_ust_app_rcu); | |
5691 | } | |
6dc3064a DG |
5692 | |
5693 | /* | |
5694 | * Take a snapshot for a given UST session. The snapshot is sent to the given | |
5695 | * output. | |
5696 | * | |
5697 | * Return 0 on success or else a negative value. | |
5698 | */ | |
5699 | int ust_app_snapshot_record(struct ltt_ust_session *usess, | |
d07ceecd MD |
5700 | struct snapshot_output *output, int wait, |
5701 | uint64_t nb_packets_per_stream) | |
6dc3064a DG |
5702 | { |
5703 | int ret = 0; | |
7badf927 | 5704 | unsigned int snapshot_done = 0; |
6dc3064a DG |
5705 | struct lttng_ht_iter iter; |
5706 | struct ust_app *app; | |
af706bb7 | 5707 | char pathname[PATH_MAX]; |
6dc3064a DG |
5708 | |
5709 | assert(usess); | |
5710 | assert(output); | |
5711 | ||
5712 | rcu_read_lock(); | |
5713 | ||
8c924c7b MD |
5714 | switch (usess->buffer_type) { |
5715 | case LTTNG_BUFFER_PER_UID: | |
5716 | { | |
5717 | struct buffer_reg_uid *reg; | |
6dc3064a | 5718 | |
8c924c7b MD |
5719 | cds_list_for_each_entry(reg, &usess->buffer_reg_uid_list, lnode) { |
5720 | struct buffer_reg_channel *reg_chan; | |
5721 | struct consumer_socket *socket; | |
6dc3064a | 5722 | |
8c924c7b MD |
5723 | /* Get consumer socket to use to push the metadata.*/ |
5724 | socket = consumer_find_socket_by_bitness(reg->bits_per_long, | |
5725 | usess->consumer); | |
5726 | if (!socket) { | |
5727 | ret = -EINVAL; | |
5728 | goto error; | |
5729 | } | |
6dc3064a | 5730 | |
8c924c7b MD |
5731 | memset(pathname, 0, sizeof(pathname)); |
5732 | ret = snprintf(pathname, sizeof(pathname), | |
5733 | DEFAULT_UST_TRACE_DIR "/" DEFAULT_UST_TRACE_UID_PATH, | |
5734 | reg->uid, reg->bits_per_long); | |
5735 | if (ret < 0) { | |
5736 | PERROR("snprintf snapshot path"); | |
5737 | goto error; | |
5738 | } | |
5739 | ||
5740 | /* Add the UST default trace dir to path. */ | |
5741 | cds_lfht_for_each_entry(reg->registry->channels->ht, &iter.iter, | |
5742 | reg_chan, node.node) { | |
68808f4e DG |
5743 | ret = consumer_snapshot_channel(socket, reg_chan->consumer_key, |
5744 | output, 0, usess->uid, usess->gid, pathname, wait, | |
d07ceecd | 5745 | nb_packets_per_stream); |
8c924c7b MD |
5746 | if (ret < 0) { |
5747 | goto error; | |
5748 | } | |
5749 | } | |
68808f4e DG |
5750 | ret = consumer_snapshot_channel(socket, |
5751 | reg->registry->reg.ust->metadata_key, output, 1, | |
d07ceecd | 5752 | usess->uid, usess->gid, pathname, wait, 0); |
8c924c7b MD |
5753 | if (ret < 0) { |
5754 | goto error; | |
5755 | } | |
7badf927 | 5756 | snapshot_done = 1; |
af706bb7 | 5757 | } |
8c924c7b MD |
5758 | break; |
5759 | } | |
5760 | case LTTNG_BUFFER_PER_PID: | |
5761 | { | |
5762 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { | |
5763 | struct consumer_socket *socket; | |
5764 | struct lttng_ht_iter chan_iter; | |
5765 | struct ust_app_channel *ua_chan; | |
5766 | struct ust_app_session *ua_sess; | |
5767 | struct ust_registry_session *registry; | |
5768 | ||
5769 | ua_sess = lookup_session_by_app(usess, app); | |
5770 | if (!ua_sess) { | |
5771 | /* Session not associated with this app. */ | |
5772 | continue; | |
5773 | } | |
af706bb7 | 5774 | |
8c924c7b MD |
5775 | /* Get the right consumer socket for the application. */ |
5776 | socket = consumer_find_socket_by_bitness(app->bits_per_long, | |
5777 | output->consumer); | |
5778 | if (!socket) { | |
5c786ded | 5779 | ret = -EINVAL; |
5c786ded JD |
5780 | goto error; |
5781 | } | |
5782 | ||
8c924c7b MD |
5783 | /* Add the UST default trace dir to path. */ |
5784 | memset(pathname, 0, sizeof(pathname)); | |
5785 | ret = snprintf(pathname, sizeof(pathname), DEFAULT_UST_TRACE_DIR "/%s", | |
5786 | ua_sess->path); | |
6dc3064a | 5787 | if (ret < 0) { |
8c924c7b | 5788 | PERROR("snprintf snapshot path"); |
6dc3064a DG |
5789 | goto error; |
5790 | } | |
6dc3064a | 5791 | |
8c924c7b MD |
5792 | cds_lfht_for_each_entry(ua_sess->channels->ht, &chan_iter.iter, |
5793 | ua_chan, node.node) { | |
68808f4e DG |
5794 | ret = consumer_snapshot_channel(socket, ua_chan->key, output, |
5795 | 0, ua_sess->euid, ua_sess->egid, pathname, wait, | |
d07ceecd | 5796 | nb_packets_per_stream); |
8c924c7b MD |
5797 | if (ret < 0) { |
5798 | goto error; | |
5799 | } | |
5800 | } | |
5801 | ||
5802 | registry = get_session_registry(ua_sess); | |
5803 | assert(registry); | |
5804 | ret = consumer_snapshot_channel(socket, registry->metadata_key, output, | |
d07ceecd | 5805 | 1, ua_sess->euid, ua_sess->egid, pathname, wait, 0); |
8c924c7b MD |
5806 | if (ret < 0) { |
5807 | goto error; | |
5808 | } | |
7badf927 | 5809 | snapshot_done = 1; |
8c924c7b MD |
5810 | } |
5811 | break; | |
5812 | } | |
5813 | default: | |
5814 | assert(0); | |
5815 | break; | |
6dc3064a DG |
5816 | } |
5817 | ||
7badf927 DG |
5818 | if (!snapshot_done) { |
5819 | /* | |
5820 | * If no snapshot was made and we are not in the error path, this means | |
5821 | * that there are no buffers thus no (prior) application to snapshot | |
5822 | * data from so we have simply NO data. | |
5823 | */ | |
5824 | ret = -ENODATA; | |
5825 | } | |
5826 | ||
6dc3064a DG |
5827 | error: |
5828 | rcu_read_unlock(); | |
5829 | return ret; | |
5830 | } | |
5c786ded JD |
5831 | |
5832 | /* | |
d07ceecd | 5833 | * Return the size taken by one more packet per stream. |
5c786ded | 5834 | */ |
d07ceecd MD |
5835 | uint64_t ust_app_get_size_one_more_packet_per_stream(struct ltt_ust_session *usess, |
5836 | uint64_t cur_nr_packets) | |
5c786ded | 5837 | { |
d07ceecd | 5838 | uint64_t tot_size = 0; |
5c786ded JD |
5839 | struct ust_app *app; |
5840 | struct lttng_ht_iter iter; | |
5841 | ||
5842 | assert(usess); | |
5843 | ||
5844 | switch (usess->buffer_type) { | |
5845 | case LTTNG_BUFFER_PER_UID: | |
5846 | { | |
5847 | struct buffer_reg_uid *reg; | |
5848 | ||
5849 | cds_list_for_each_entry(reg, &usess->buffer_reg_uid_list, lnode) { | |
5850 | struct buffer_reg_channel *reg_chan; | |
5851 | ||
b7064eaa | 5852 | rcu_read_lock(); |
5c786ded JD |
5853 | cds_lfht_for_each_entry(reg->registry->channels->ht, &iter.iter, |
5854 | reg_chan, node.node) { | |
d07ceecd MD |
5855 | if (cur_nr_packets >= reg_chan->num_subbuf) { |
5856 | /* | |
5857 | * Don't take channel into account if we | |
5858 | * already grab all its packets. | |
5859 | */ | |
5860 | continue; | |
5861 | } | |
5862 | tot_size += reg_chan->subbuf_size * reg_chan->stream_count; | |
5c786ded | 5863 | } |
b7064eaa | 5864 | rcu_read_unlock(); |
5c786ded JD |
5865 | } |
5866 | break; | |
5867 | } | |
5868 | case LTTNG_BUFFER_PER_PID: | |
5869 | { | |
5870 | rcu_read_lock(); | |
5871 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { | |
5872 | struct ust_app_channel *ua_chan; | |
5873 | struct ust_app_session *ua_sess; | |
5874 | struct lttng_ht_iter chan_iter; | |
5875 | ||
5876 | ua_sess = lookup_session_by_app(usess, app); | |
5877 | if (!ua_sess) { | |
5878 | /* Session not associated with this app. */ | |
5879 | continue; | |
5880 | } | |
5881 | ||
5882 | cds_lfht_for_each_entry(ua_sess->channels->ht, &chan_iter.iter, | |
5883 | ua_chan, node.node) { | |
d07ceecd MD |
5884 | if (cur_nr_packets >= ua_chan->attr.num_subbuf) { |
5885 | /* | |
5886 | * Don't take channel into account if we | |
5887 | * already grab all its packets. | |
5888 | */ | |
5889 | continue; | |
5890 | } | |
5891 | tot_size += ua_chan->attr.subbuf_size * ua_chan->streams.count; | |
5c786ded JD |
5892 | } |
5893 | } | |
5894 | rcu_read_unlock(); | |
5895 | break; | |
5896 | } | |
5897 | default: | |
5898 | assert(0); | |
5899 | break; | |
5900 | } | |
5901 | ||
d07ceecd | 5902 | return tot_size; |
5c786ded | 5903 | } |
fb83fe64 JD |
5904 | |
5905 | int ust_app_uid_get_channel_runtime_stats(uint64_t ust_session_id, | |
5906 | struct cds_list_head *buffer_reg_uid_list, | |
5907 | struct consumer_output *consumer, uint64_t uchan_id, | |
5908 | int overwrite, uint64_t *discarded, uint64_t *lost) | |
5909 | { | |
5910 | int ret; | |
5911 | uint64_t consumer_chan_key; | |
5912 | ||
5913 | ret = buffer_reg_uid_consumer_channel_key( | |
5914 | buffer_reg_uid_list, ust_session_id, | |
5915 | uchan_id, &consumer_chan_key); | |
5916 | if (ret < 0) { | |
5917 | goto end; | |
5918 | } | |
5919 | ||
5920 | if (overwrite) { | |
5921 | ret = consumer_get_lost_packets(ust_session_id, | |
5922 | consumer_chan_key, consumer, lost); | |
5923 | } else { | |
5924 | ret = consumer_get_discarded_events(ust_session_id, | |
5925 | consumer_chan_key, consumer, discarded); | |
5926 | } | |
5927 | ||
5928 | end: | |
5929 | return ret; | |
5930 | } | |
5931 | ||
5932 | int ust_app_pid_get_channel_runtime_stats(struct ltt_ust_session *usess, | |
5933 | struct ltt_ust_channel *uchan, | |
5934 | struct consumer_output *consumer, int overwrite, | |
5935 | uint64_t *discarded, uint64_t *lost) | |
5936 | { | |
5937 | int ret = 0; | |
5938 | struct lttng_ht_iter iter; | |
5939 | struct lttng_ht_node_str *ua_chan_node; | |
5940 | struct ust_app *app; | |
5941 | struct ust_app_session *ua_sess; | |
5942 | struct ust_app_channel *ua_chan; | |
5943 | ||
5944 | rcu_read_lock(); | |
5945 | /* | |
5946 | * Iterate over every registered applications, return when we | |
5947 | * found one in the right session and channel. | |
5948 | */ | |
5949 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { | |
5950 | struct lttng_ht_iter uiter; | |
5951 | ||
5952 | ua_sess = lookup_session_by_app(usess, app); | |
5953 | if (ua_sess == NULL) { | |
5954 | continue; | |
5955 | } | |
5956 | ||
5957 | /* Get channel */ | |
ee022399 | 5958 | lttng_ht_lookup(ua_sess->channels, (void *) uchan->name, &uiter); |
fb83fe64 JD |
5959 | ua_chan_node = lttng_ht_iter_get_node_str(&uiter); |
5960 | /* If the session is found for the app, the channel must be there */ | |
5961 | assert(ua_chan_node); | |
5962 | ||
5963 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); | |
5964 | ||
5965 | if (overwrite) { | |
5966 | ret = consumer_get_lost_packets(usess->id, ua_chan->key, | |
5967 | consumer, lost); | |
5968 | goto end; | |
5969 | } else { | |
5970 | ret = consumer_get_discarded_events(usess->id, | |
5971 | ua_chan->key, consumer, discarded); | |
5972 | goto end; | |
5973 | } | |
5974 | goto end; | |
5975 | } | |
5976 | ||
5977 | end: | |
5978 | rcu_read_unlock(); | |
5979 | return ret; | |
5980 | } |