Add UST uid/gid contexts
[lttng-tools.git] / src / bin / lttng-sessiond / trace-ust.c
CommitLineData
97ee3a89
DG
1/*
2 * Copyright (C) 2011 - David Goulet <david.goulet@polymtl.ca>
bdf64013 3 * Copyright (C) 2016 - Jérémie Galarneau <jeremie.galarneau@efficios.com>
97ee3a89 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.
97ee3a89 8 *
d14d33bf
AM
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.
97ee3a89 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.
97ee3a89
DG
17 */
18
6c1c0768 19#define _LGPL_SOURCE
97ee3a89
DG
20#include <stdio.h>
21#include <stdlib.h>
22#include <string.h>
23#include <unistd.h>
d9bf3ca4 24#include <inttypes.h>
97ee3a89 25
990570ed
DG
26#include <common/common.h>
27#include <common/defaults.h>
82b69413 28#include <common/trace-chunk.h>
97ee3a89 29
7972aab2 30#include "buffer-registry.h"
97ee3a89 31#include "trace-ust.h"
0b2dc8df 32#include "utils.h"
a9ad0c8f 33#include "ust-app.h"
7c1d2758 34#include "agent.h"
97ee3a89 35
025faf73
DG
36/*
37 * Match function for the events hash table lookup.
38 *
39 * Matches by name only. Used by the disable command.
40 */
18eace3b
DG
41int trace_ust_ht_match_event_by_name(struct cds_lfht_node *node,
42 const void *_key)
43{
44 struct ltt_ust_event *event;
45 const char *name;
46
47 assert(node);
48 assert(_key);
49
50 event = caa_container_of(node, struct ltt_ust_event, node.node);
51 name = _key;
52
53 /* Event name */
54 if (strncmp(event->attr.name, name, sizeof(event->attr.name)) != 0) {
55 goto no_match;
56 }
57
025faf73 58 /* Match */
18eace3b
DG
59 return 1;
60
61no_match:
62 return 0;
63}
64
025faf73
DG
65/*
66 * Match function for the hash table lookup.
67 *
68 * It matches an ust event based on three attributes which are the event name,
69 * the filter bytecode and the loglevel.
70 */
18eace3b
DG
71int trace_ust_ht_match_event(struct cds_lfht_node *node, const void *_key)
72{
73 struct ltt_ust_event *event;
74 const struct ltt_ust_ht_key *key;
2106efa0 75 int ev_loglevel_value;
19a97244 76 int ll_match;
18eace3b
DG
77
78 assert(node);
79 assert(_key);
80
81 event = caa_container_of(node, struct ltt_ust_event, node.node);
82 key = _key;
2106efa0 83 ev_loglevel_value = event->attr.loglevel;
18eace3b 84
f19e9f8b 85 /* Match the 4 elements of the key: name, filter, loglevel, exclusions. */
18eace3b
DG
86
87 /* Event name */
88 if (strncmp(event->attr.name, key->name, sizeof(event->attr.name)) != 0) {
18eace3b
DG
89 goto no_match;
90 }
91
b953b8cd 92 /* Event loglevel value and type. */
19a97244
PP
93 ll_match = loglevels_match(event->attr.loglevel_type,
94 ev_loglevel_value, key->loglevel_type,
95 key->loglevel_value, LTTNG_UST_LOGLEVEL_ALL);
96
97 if (!ll_match) {
b953b8cd 98 goto no_match;
18eace3b
DG
99 }
100
101 /* Only one of the filters is NULL, fail. */
102 if ((key->filter && !event->filter) || (!key->filter && event->filter)) {
18eace3b
DG
103 goto no_match;
104 }
105
025faf73
DG
106 if (key->filter && event->filter) {
107 /* Both filters exists, check length followed by the bytecode. */
108 if (event->filter->len != key->filter->len ||
109 memcmp(event->filter->data, key->filter->data,
110 event->filter->len) != 0) {
111 goto no_match;
112 }
18eace3b
DG
113 }
114
f19e9f8b
JI
115 /* If only one of the exclusions is NULL, fail. */
116 if ((key->exclusion && !event->exclusion) || (!key->exclusion && event->exclusion)) {
117 goto no_match;
118 }
119
120 if (key->exclusion && event->exclusion) {
a5b7e00c
PP
121 size_t i;
122
123 /* Check exclusion counts first. */
124 if (event->exclusion->count != key->exclusion->count) {
f19e9f8b
JI
125 goto no_match;
126 }
a5b7e00c
PP
127
128 /* Compare names individually. */
129 for (i = 0; i < event->exclusion->count; ++i) {
130 size_t j;
131 bool found = false;
132 const char *name_ev =
133 LTTNG_EVENT_EXCLUSION_NAME_AT(
134 event->exclusion, i);
135
136 /*
137 * Compare this exclusion name to all the key's
138 * exclusion names.
139 */
140 for (j = 0; j < key->exclusion->count; ++j) {
141 const char *name_key =
142 LTTNG_EVENT_EXCLUSION_NAME_AT(
143 key->exclusion, j);
144
145 if (!strncmp(name_ev, name_key,
146 LTTNG_SYMBOL_NAME_LEN)) {
147 /* Names match! */
148 found = true;
149 break;
150 }
151 }
152
153 /*
154 * If the current exclusion name was not found amongst
155 * the key's exclusion names, then there's no match.
156 */
157 if (!found) {
158 goto no_match;
159 }
160 }
f19e9f8b 161 }
025faf73
DG
162 /* Match. */
163 return 1;
18eace3b
DG
164
165no_match:
166 return 0;
18eace3b
DG
167}
168
0177d773 169/*
2223c96f
DG
170 * Find the channel in the hashtable and return channel pointer. RCU read side
171 * lock MUST be acquired before calling this.
0177d773 172 */
bec39940 173struct ltt_ust_channel *trace_ust_find_channel_by_name(struct lttng_ht *ht,
df4f5a87 174 const char *name)
0177d773 175{
bec39940
DG
176 struct lttng_ht_node_str *node;
177 struct lttng_ht_iter iter;
0177d773 178
85076754
MD
179 /*
180 * If we receive an empty string for channel name, it means the
181 * default channel name is requested.
182 */
183 if (name[0] == '\0')
184 name = DEFAULT_CHANNEL_NAME;
185
bec39940
DG
186 lttng_ht_lookup(ht, (void *)name, &iter);
187 node = lttng_ht_iter_get_node_str(&iter);
f6a9efaa 188 if (node == NULL) {
44d3bd01
DG
189 goto error;
190 }
191
f6a9efaa 192 DBG2("Trace UST channel %s found by name", name);
0177d773 193
f6a9efaa 194 return caa_container_of(node, struct ltt_ust_channel, node);
97ee3a89
DG
195
196error:
f6a9efaa 197 DBG2("Trace UST channel %s not found by name", name);
97ee3a89
DG
198 return NULL;
199}
200
201/*
2223c96f
DG
202 * Find the event in the hashtable and return event pointer. RCU read side lock
203 * MUST be acquired before calling this.
97ee3a89 204 */
18eace3b 205struct ltt_ust_event *trace_ust_find_event(struct lttng_ht *ht,
2106efa0 206 char *name, struct lttng_filter_bytecode *filter,
b953b8cd
PP
207 enum lttng_ust_loglevel_type loglevel_type, int loglevel_value,
208 struct lttng_event_exclusion *exclusion)
97ee3a89 209{
bec39940
DG
210 struct lttng_ht_node_str *node;
211 struct lttng_ht_iter iter;
18eace3b 212 struct ltt_ust_ht_key key;
97ee3a89 213
18eace3b
DG
214 assert(name);
215 assert(ht);
216
217 key.name = name;
218 key.filter = filter;
b953b8cd
PP
219 key.loglevel_type = loglevel_type;
220 key.loglevel_value = loglevel_value;
10646003 221 key.exclusion = exclusion;
18eace3b 222
18eace3b
DG
223 cds_lfht_lookup(ht->ht, ht->hash_fct((void *) name, lttng_ht_seed),
224 trace_ust_ht_match_event, &key, &iter.iter);
bec39940 225 node = lttng_ht_iter_get_node_str(&iter);
f6a9efaa 226 if (node == NULL) {
97ee3a89
DG
227 goto error;
228 }
229
18eace3b 230 DBG2("Trace UST event %s found", key.name);
f6a9efaa
DG
231
232 return caa_container_of(node, struct ltt_ust_event, node);
97ee3a89
DG
233
234error:
18eace3b 235 DBG2("Trace UST event %s NOT found", key.name);
97ee3a89
DG
236 return NULL;
237}
238
fefd409b
DG
239/*
240 * Lookup an agent in the session agents hash table by domain type and return
241 * the object if found else NULL.
4da703ad
JG
242 *
243 * RCU read side lock must be acquired before calling and only released
244 * once the agent is no longer in scope or being used.
fefd409b
DG
245 */
246struct agent *trace_ust_find_agent(struct ltt_ust_session *session,
247 enum lttng_domain_type domain_type)
248{
249 struct agent *agt = NULL;
250 struct lttng_ht_node_u64 *node;
251 struct lttng_ht_iter iter;
252 uint64_t key;
253
254 assert(session);
255
256 DBG3("Trace ust agent lookup for domain %d", domain_type);
257
258 key = domain_type;
259
260 lttng_ht_lookup(session->agents, &key, &iter);
261 node = lttng_ht_iter_get_node_u64(&iter);
262 if (!node) {
263 goto end;
264 }
265 agt = caa_container_of(node, struct agent, node);
266
267end:
268 return agt;
269}
270
97ee3a89
DG
271/*
272 * Allocate and initialize a ust session data structure.
273 *
274 * Return pointer to structure or NULL.
275 */
d9bf3ca4 276struct ltt_ust_session *trace_ust_create_session(uint64_t session_id)
97ee3a89
DG
277{
278 struct ltt_ust_session *lus;
279
280 /* Allocate a new ltt ust session */
ba7f0ae5 281 lus = zmalloc(sizeof(struct ltt_ust_session));
97ee3a89 282 if (lus == NULL) {
ba7f0ae5 283 PERROR("create ust session zmalloc");
97ee3a89
DG
284 goto error;
285 }
286
287 /* Init data structure */
a991f516 288 lus->id = session_id;
14fb1ebe 289 lus->active = 0;
97ee3a89 290
84ad93e8
DG
291 /* Set default metadata channel attribute. */
292 lus->metadata_attr.overwrite = DEFAULT_CHANNEL_OVERWRITE;
293 lus->metadata_attr.subbuf_size = default_get_metadata_subbuf_size();
294 lus->metadata_attr.num_subbuf = DEFAULT_METADATA_SUBBUF_NUM;
295 lus->metadata_attr.switch_timer_interval = DEFAULT_METADATA_SWITCH_TIMER;
296 lus->metadata_attr.read_timer_interval = DEFAULT_METADATA_READ_TIMER;
297 lus->metadata_attr.output = LTTNG_UST_MMAP;
298
7972aab2
DG
299 /*
300 * Default buffer type. This can be changed through an enable channel
301 * requesting a different type. Note that this can only be changed once
302 * during the session lifetime which is at the first enable channel and
303 * only before start. The flag buffer_type_changed indicates the status.
304 */
8692d4e5 305 lus->buffer_type = LTTNG_BUFFER_PER_UID;
7972aab2
DG
306 /* Once set to 1, the buffer_type is immutable for the session. */
307 lus->buffer_type_changed = 0;
308 /* Init it in case it get used after allocation. */
309 CDS_INIT_LIST_HEAD(&lus->buffer_reg_uid_list);
f6a9efaa
DG
310
311 /* Alloc UST global domain channels' HT */
bec39940 312 lus->domain_global.channels = lttng_ht_new(0, LTTNG_HT_TYPE_STRING);
fefd409b
DG
313 /* Alloc agent hash table. */
314 lus->agents = lttng_ht_new(0, LTTNG_HT_TYPE_U64);
44d3bd01 315
00e2e675
DG
316 lus->consumer = consumer_create_output(CONSUMER_DST_LOCAL);
317 if (lus->consumer == NULL) {
09a90bcd 318 goto error_consumer;
00e2e675
DG
319 }
320
44d3bd01
DG
321 DBG2("UST trace session create successful");
322
97ee3a89
DG
323 return lus;
324
09a90bcd 325error_consumer:
0b2dc8df 326 ht_cleanup_push(lus->domain_global.channels);
fefd409b 327 ht_cleanup_push(lus->agents);
44844c29 328 free(lus);
97ee3a89
DG
329error:
330 return NULL;
331}
332
333/*
334 * Allocate and initialize a ust channel data structure.
335 *
336 * Return pointer to structure or NULL.
337 */
51755dc8
JG
338struct ltt_ust_channel *trace_ust_create_channel(struct lttng_channel *chan,
339 enum lttng_domain_type domain)
97ee3a89 340{
97ee3a89
DG
341 struct ltt_ust_channel *luc;
342
0525e9ae 343 assert(chan);
0525e9ae 344
37357452 345 luc = zmalloc(sizeof(struct ltt_ust_channel));
97ee3a89 346 if (luc == NULL) {
df0f840b 347 PERROR("ltt_ust_channel zmalloc");
97ee3a89
DG
348 goto error;
349 }
350
51755dc8
JG
351 luc->domain = domain;
352
44d3bd01 353 /* Copy UST channel attributes */
48842b30
DG
354 luc->attr.overwrite = chan->attr.overwrite;
355 luc->attr.subbuf_size = chan->attr.subbuf_size;
356 luc->attr.num_subbuf = chan->attr.num_subbuf;
357 luc->attr.switch_timer_interval = chan->attr.switch_timer_interval;
358 luc->attr.read_timer_interval = chan->attr.read_timer_interval;
6775595e 359 luc->attr.output = (enum lttng_ust_output) chan->attr.output;
82b4ebce
JG
360 luc->monitor_timer_interval = ((struct lttng_channel_extended *)
361 chan->attr.extended.ptr)->monitor_timer_interval;
491d1539
MD
362 luc->attr.u.s.blocking_timeout = ((struct lttng_channel_extended *)
363 chan->attr.extended.ptr)->blocking_timeout;
44d3bd01
DG
364
365 /* Translate to UST output enum */
366 switch (luc->attr.output) {
367 default:
368 luc->attr.output = LTTNG_UST_MMAP;
369 break;
97ee3a89 370 }
97ee3a89 371
85076754
MD
372 /*
373 * If we receive an empty string for channel name, it means the
374 * default channel name is requested.
375 */
376 if (chan->name[0] == '\0') {
377 strncpy(luc->name, DEFAULT_CHANNEL_NAME, sizeof(luc->name));
378 } else {
379 /* Copy channel name */
380 strncpy(luc->name, chan->name, sizeof(luc->name));
381 }
97ee3a89
DG
382 luc->name[LTTNG_UST_SYM_NAME_LEN - 1] = '\0';
383
f6a9efaa 384 /* Init node */
bec39940 385 lttng_ht_node_init_str(&luc->node, luc->name);
31746f93
DG
386 CDS_INIT_LIST_HEAD(&luc->ctx_list);
387
f6a9efaa 388 /* Alloc hash tables */
bec39940
DG
389 luc->events = lttng_ht_new(0, LTTNG_HT_TYPE_STRING);
390 luc->ctx = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG);
f6a9efaa 391
1624d5b7
JD
392 /* On-disk circular buffer parameters */
393 luc->tracefile_size = chan->attr.tracefile_size;
394 luc->tracefile_count = chan->attr.tracefile_count;
395
f6a9efaa
DG
396 DBG2("Trace UST channel %s created", luc->name);
397
97ee3a89 398error:
7972aab2 399 return luc;
97ee3a89
DG
400}
401
ad11a1d3
PP
402/*
403 * Validates an exclusion list.
404 *
405 * Returns 0 if valid, negative value if invalid.
406 */
407static int validate_exclusion(struct lttng_event_exclusion *exclusion)
408{
409 size_t i;
410 int ret = 0;
411
412 assert(exclusion);
413
414 for (i = 0; i < exclusion->count; ++i) {
415 size_t j;
416 const char *name_a =
417 LTTNG_EVENT_EXCLUSION_NAME_AT(exclusion, i);
418
419 for (j = 0; j < i; ++j) {
420 const char *name_b =
421 LTTNG_EVENT_EXCLUSION_NAME_AT(exclusion, j);
422
423 if (!strncmp(name_a, name_b, LTTNG_SYMBOL_NAME_LEN)) {
424 /* Match! */
425 ret = -1;
426 goto end;
427 }
428 }
429 }
430
431end:
432 return ret;
433}
434
97ee3a89
DG
435/*
436 * Allocate and initialize a ust event. Set name and event type.
49d21f93 437 * We own filter_expression, filter, and exclusion.
97ee3a89 438 *
39687410 439 * Return an lttng_error_code
97ee3a89 440 */
39687410 441enum lttng_error_code trace_ust_create_event(struct lttng_event *ev,
6b453b5e 442 char *filter_expression,
561c6897 443 struct lttng_filter_bytecode *filter,
88f06f15 444 struct lttng_event_exclusion *exclusion,
39687410
FD
445 bool internal_event,
446 struct ltt_ust_event **ust_event)
97ee3a89 447{
39687410
FD
448 struct ltt_ust_event *local_ust_event;
449 enum lttng_error_code ret = LTTNG_OK;
97ee3a89 450
0525e9ae
DG
451 assert(ev);
452
ad11a1d3 453 if (exclusion && validate_exclusion(exclusion)) {
39687410 454 ret = LTTNG_ERR_INVALID;
ad11a1d3
PP
455 goto error;
456 }
457
39687410
FD
458 local_ust_event = zmalloc(sizeof(struct ltt_ust_event));
459 if (local_ust_event == NULL) {
ba7f0ae5 460 PERROR("ust event zmalloc");
39687410 461 ret = LTTNG_ERR_NOMEM;
97ee3a89
DG
462 goto error;
463 }
464
39687410 465 local_ust_event->internal = internal_event;
88f06f15 466
97ee3a89
DG
467 switch (ev->type) {
468 case LTTNG_EVENT_PROBE:
39687410 469 local_ust_event->attr.instrumentation = LTTNG_UST_PROBE;
97ee3a89
DG
470 break;
471 case LTTNG_EVENT_FUNCTION:
39687410 472 local_ust_event->attr.instrumentation = LTTNG_UST_FUNCTION;
97ee3a89
DG
473 break;
474 case LTTNG_EVENT_FUNCTION_ENTRY:
39687410 475 local_ust_event->attr.instrumentation = LTTNG_UST_FUNCTION;
97ee3a89
DG
476 break;
477 case LTTNG_EVENT_TRACEPOINT:
39687410 478 local_ust_event->attr.instrumentation = LTTNG_UST_TRACEPOINT;
97ee3a89
DG
479 break;
480 default:
481 ERR("Unknown ust instrumentation type (%d)", ev->type);
39687410 482 ret = LTTNG_ERR_INVALID;
44844c29 483 goto error_free_event;
97ee3a89
DG
484 }
485
486 /* Copy event name */
39687410
FD
487 strncpy(local_ust_event->attr.name, ev->name, LTTNG_UST_SYM_NAME_LEN);
488 local_ust_event->attr.name[LTTNG_UST_SYM_NAME_LEN - 1] = '\0';
97ee3a89 489
0cda4f28 490 switch (ev->loglevel_type) {
8005f29a 491 case LTTNG_EVENT_LOGLEVEL_ALL:
39687410
FD
492 local_ust_event->attr.loglevel_type = LTTNG_UST_LOGLEVEL_ALL;
493 local_ust_event->attr.loglevel = -1; /* Force to -1 */
0cda4f28 494 break;
8005f29a 495 case LTTNG_EVENT_LOGLEVEL_RANGE:
39687410
FD
496 local_ust_event->attr.loglevel_type = LTTNG_UST_LOGLEVEL_RANGE;
497 local_ust_event->attr.loglevel = ev->loglevel;
8005f29a
MD
498 break;
499 case LTTNG_EVENT_LOGLEVEL_SINGLE:
39687410
FD
500 local_ust_event->attr.loglevel_type = LTTNG_UST_LOGLEVEL_SINGLE;
501 local_ust_event->attr.loglevel = ev->loglevel;
0cda4f28
MD
502 break;
503 default:
4431494b 504 ERR("Unknown ust loglevel type (%d)", ev->loglevel_type);
39687410 505 ret = LTTNG_ERR_INVALID;
0cda4f28
MD
506 goto error_free_event;
507 }
508
025faf73 509 /* Same layout. */
39687410
FD
510 local_ust_event->filter_expression = filter_expression;
511 local_ust_event->filter = filter;
512 local_ust_event->exclusion = exclusion;
0cda4f28 513
f6a9efaa 514 /* Init node */
39687410 515 lttng_ht_node_init_str(&local_ust_event->node, local_ust_event->attr.name);
97ee3a89 516
300b8fd5 517 DBG2("Trace UST event %s, loglevel (%d,%d) created",
39687410
FD
518 local_ust_event->attr.name, local_ust_event->attr.loglevel_type,
519 local_ust_event->attr.loglevel);
520
521 *ust_event = local_ust_event;
284d8f55 522
39687410 523 return ret;
97ee3a89 524
44844c29 525error_free_event:
39687410 526 free(local_ust_event);
97ee3a89 527error:
49d21f93
MD
528 free(filter_expression);
529 free(filter);
530 free(exclusion);
39687410 531 return ret;
97ee3a89
DG
532}
533
aa3514e9 534static
bdf64013
JG
535int trace_ust_context_type_event_to_ust(
536 enum lttng_event_context_type type)
55cc08a6 537{
aa3514e9 538 int utype;
0525e9ae 539
aa3514e9 540 switch (type) {
9197c5c4
MD
541 case LTTNG_EVENT_CONTEXT_VTID:
542 utype = LTTNG_UST_CONTEXT_VTID;
543 break;
544 case LTTNG_EVENT_CONTEXT_VPID:
545 utype = LTTNG_UST_CONTEXT_VPID;
546 break;
547 case LTTNG_EVENT_CONTEXT_PTHREAD_ID:
548 utype = LTTNG_UST_CONTEXT_PTHREAD_ID;
549 break;
550 case LTTNG_EVENT_CONTEXT_PROCNAME:
551 utype = LTTNG_UST_CONTEXT_PROCNAME;
552 break;
7c612c2e
WP
553 case LTTNG_EVENT_CONTEXT_IP:
554 utype = LTTNG_UST_CONTEXT_IP;
555 break;
aa3514e9 556 case LTTNG_EVENT_CONTEXT_PERF_THREAD_COUNTER:
354e561b
MD
557 if (!ustctl_has_perf_counters()) {
558 utype = -1;
559 WARN("Perf counters not implemented in UST");
560 } else {
561 utype = LTTNG_UST_CONTEXT_PERF_THREAD_COUNTER;
562 }
aa3514e9 563 break;
bdf64013
JG
564 case LTTNG_EVENT_CONTEXT_APP_CONTEXT:
565 utype = LTTNG_UST_CONTEXT_APP_CONTEXT;
566 break;
f17b8732
MJ
567 case LTTNG_EVENT_CONTEXT_CGROUP_NS:
568 utype = LTTNG_UST_CONTEXT_CGROUP_NS;
569 break;
570 case LTTNG_EVENT_CONTEXT_IPC_NS:
571 utype = LTTNG_UST_CONTEXT_IPC_NS;
572 break;
573 case LTTNG_EVENT_CONTEXT_MNT_NS:
574 utype = LTTNG_UST_CONTEXT_MNT_NS;
575 break;
576 case LTTNG_EVENT_CONTEXT_NET_NS:
577 utype = LTTNG_UST_CONTEXT_NET_NS;
578 break;
579 case LTTNG_EVENT_CONTEXT_PID_NS:
580 utype = LTTNG_UST_CONTEXT_PID_NS;
581 break;
582 case LTTNG_EVENT_CONTEXT_USER_NS:
583 utype = LTTNG_UST_CONTEXT_USER_NS;
584 break;
585 case LTTNG_EVENT_CONTEXT_UTS_NS:
586 utype = LTTNG_UST_CONTEXT_UTS_NS;
587 break;
4fc59cb8
MJ
588 case LTTNG_EVENT_CONTEXT_VUID:
589 utype = LTTNG_UST_CONTEXT_VUID;
590 break;
591 case LTTNG_EVENT_CONTEXT_VEUID:
592 utype = LTTNG_UST_CONTEXT_VEUID;
593 break;
594 case LTTNG_EVENT_CONTEXT_VSUID:
595 utype = LTTNG_UST_CONTEXT_VSUID;
596 break;
597 case LTTNG_EVENT_CONTEXT_VGID:
598 utype = LTTNG_UST_CONTEXT_VGID;
599 break;
600 case LTTNG_EVENT_CONTEXT_VEGID:
601 utype = LTTNG_UST_CONTEXT_VEGID;
602 break;
603 case LTTNG_EVENT_CONTEXT_VSGID:
604 utype = LTTNG_UST_CONTEXT_VSGID;
605 break;
9197c5c4 606 default:
aa3514e9
MD
607 utype = -1;
608 break;
609 }
610 return utype;
611}
612
613/*
614 * Return 1 if contexts match, 0 otherwise.
615 */
df4f5a87
JG
616int trace_ust_match_context(const struct ltt_ust_context *uctx,
617 const struct lttng_event_context *ctx)
aa3514e9
MD
618{
619 int utype;
620
621 utype = trace_ust_context_type_event_to_ust(ctx->ctx);
622 if (utype < 0) {
623 return 0;
624 }
625 if (uctx->ctx.ctx != utype) {
626 return 0;
627 }
628 switch (utype) {
629 case LTTNG_UST_CONTEXT_PERF_THREAD_COUNTER:
630 if (uctx->ctx.u.perf_counter.type
631 != ctx->u.perf_counter.type) {
632 return 0;
633 }
634 if (uctx->ctx.u.perf_counter.config
635 != ctx->u.perf_counter.config) {
636 return 0;
637 }
638 if (strncmp(uctx->ctx.u.perf_counter.name,
639 ctx->u.perf_counter.name,
640 LTTNG_UST_SYM_NAME_LEN)) {
641 return 0;
642 }
643 break;
54fb33cf
JG
644 case LTTNG_UST_CONTEXT_APP_CONTEXT:
645 assert(uctx->ctx.u.app_ctx.provider_name);
646 assert(uctx->ctx.u.app_ctx.ctx_name);
647 if (strcmp(uctx->ctx.u.app_ctx.provider_name,
648 ctx->u.app_ctx.provider_name) ||
649 strcmp(uctx->ctx.u.app_ctx.ctx_name,
650 ctx->u.app_ctx.ctx_name)) {
651 return 0;
652 }
aa3514e9
MD
653 default:
654 break;
655
656 }
657 return 1;
658}
659
660/*
661 * Allocate and initialize an UST context.
662 *
663 * Return pointer to structure or NULL.
664 */
665struct ltt_ust_context *trace_ust_create_context(
df4f5a87 666 const struct lttng_event_context *ctx)
aa3514e9 667{
bdf64013 668 struct ltt_ust_context *uctx = NULL;
aa3514e9
MD
669 int utype;
670
671 assert(ctx);
672
673 utype = trace_ust_context_type_event_to_ust(ctx->ctx);
674 if (utype < 0) {
1cf992b8 675 ERR("Invalid UST context");
bdf64013 676 goto end;
9197c5c4 677 }
55cc08a6
DG
678
679 uctx = zmalloc(sizeof(struct ltt_ust_context));
bdf64013 680 if (!uctx) {
55cc08a6 681 PERROR("zmalloc ltt_ust_context");
bdf64013 682 goto end;
55cc08a6
DG
683 }
684
aa3514e9
MD
685 uctx->ctx.ctx = (enum lttng_ust_context_type) utype;
686 switch (utype) {
687 case LTTNG_UST_CONTEXT_PERF_THREAD_COUNTER:
688 uctx->ctx.u.perf_counter.type = ctx->u.perf_counter.type;
689 uctx->ctx.u.perf_counter.config = ctx->u.perf_counter.config;
690 strncpy(uctx->ctx.u.perf_counter.name, ctx->u.perf_counter.name,
691 LTTNG_UST_SYM_NAME_LEN);
692 uctx->ctx.u.perf_counter.name[LTTNG_UST_SYM_NAME_LEN - 1] = '\0';
693 break;
bdf64013
JG
694 case LTTNG_UST_CONTEXT_APP_CONTEXT:
695 {
696 char *provider_name = NULL, *ctx_name = NULL;
697
698 provider_name = strdup(ctx->u.app_ctx.provider_name);
699 if (!provider_name) {
700 goto error;
701 }
702 uctx->ctx.u.app_ctx.provider_name = provider_name;
703
704 ctx_name = strdup(ctx->u.app_ctx.ctx_name);
705 if (!ctx_name) {
706 goto error;
707 }
708 uctx->ctx.u.app_ctx.ctx_name = ctx_name;
709 break;
710 }
aa3514e9
MD
711 default:
712 break;
713 }
bec39940 714 lttng_ht_node_init_ulong(&uctx->node, (unsigned long) uctx->ctx.ctx);
bdf64013 715end:
55cc08a6 716 return uctx;
55cc08a6 717error:
bdf64013 718 trace_ust_destroy_context(uctx);
55cc08a6
DG
719 return NULL;
720}
721
a9ad0c8f
MD
722static
723void destroy_pid_tracker_node_rcu(struct rcu_head *head)
724{
725 struct ust_pid_tracker_node *tracker_node =
726 caa_container_of(head, struct ust_pid_tracker_node, node.head);
727 free(tracker_node);
728}
729
730static
731void destroy_pid_tracker_node(struct ust_pid_tracker_node *tracker_node)
732{
733
734 call_rcu(&tracker_node->node.head, destroy_pid_tracker_node_rcu);
735}
736
737static
738int init_pid_tracker(struct ust_pid_tracker *pid_tracker)
739{
740 int ret = 0;
741
742 pid_tracker->ht = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG);
743 if (!pid_tracker->ht) {
744 ret = -1;
745 goto end;
746 }
747
748end:
749 return ret;
750}
751
752/*
753 * Teardown pid tracker content, but don't free pid_tracker object.
754 */
755static
756void fini_pid_tracker(struct ust_pid_tracker *pid_tracker)
757{
758 struct ust_pid_tracker_node *tracker_node;
759 struct lttng_ht_iter iter;
760
761 if (!pid_tracker->ht) {
762 return;
763 }
764 rcu_read_lock();
765 cds_lfht_for_each_entry(pid_tracker->ht->ht,
766 &iter.iter, tracker_node, node.node) {
767 int ret = lttng_ht_del(pid_tracker->ht, &iter);
768
769 assert(!ret);
770 destroy_pid_tracker_node(tracker_node);
771 }
772 rcu_read_unlock();
773 ht_cleanup_push(pid_tracker->ht);
774 pid_tracker->ht = NULL;
775}
776
777static
778struct ust_pid_tracker_node *pid_tracker_lookup(
779 struct ust_pid_tracker *pid_tracker, int pid,
780 struct lttng_ht_iter *iter)
781{
782 unsigned long _pid = (unsigned long) pid;
783 struct lttng_ht_node_ulong *node;
784
785 lttng_ht_lookup(pid_tracker->ht, (void *) _pid, iter);
786 node = lttng_ht_iter_get_node_ulong(iter);
787 if (node) {
788 return caa_container_of(node, struct ust_pid_tracker_node,
789 node);
790 } else {
791 return NULL;
792 }
793}
794
795static
796int pid_tracker_add_pid(struct ust_pid_tracker *pid_tracker, int pid)
797{
798 int retval = LTTNG_OK;
799 struct ust_pid_tracker_node *tracker_node;
800 struct lttng_ht_iter iter;
801
802 if (pid < 0) {
803 retval = LTTNG_ERR_INVALID;
804 goto end;
805 }
806 tracker_node = pid_tracker_lookup(pid_tracker, pid, &iter);
807 if (tracker_node) {
808 /* Already exists. */
b93a4a13 809 retval = LTTNG_ERR_PID_TRACKED;
a9ad0c8f
MD
810 goto end;
811 }
812 tracker_node = zmalloc(sizeof(*tracker_node));
813 if (!tracker_node) {
814 retval = LTTNG_ERR_NOMEM;
815 goto end;
816 }
817 lttng_ht_node_init_ulong(&tracker_node->node, (unsigned long) pid);
818 lttng_ht_add_unique_ulong(pid_tracker->ht, &tracker_node->node);
819end:
820 return retval;
821}
822
823static
824int pid_tracker_del_pid(struct ust_pid_tracker *pid_tracker, int pid)
825{
826 int retval = LTTNG_OK, ret;
827 struct ust_pid_tracker_node *tracker_node;
828 struct lttng_ht_iter iter;
829
830 if (pid < 0) {
831 retval = LTTNG_ERR_INVALID;
832 goto end;
833 }
834 tracker_node = pid_tracker_lookup(pid_tracker, pid, &iter);
835 if (!tracker_node) {
836 /* Not found */
b93a4a13 837 retval = LTTNG_ERR_PID_NOT_TRACKED;
a9ad0c8f
MD
838 goto end;
839 }
840 ret = lttng_ht_del(pid_tracker->ht, &iter);
841 assert(!ret);
842
843 destroy_pid_tracker_node(tracker_node);
844end:
845 return retval;
846}
847
848/*
849 * The session lock is held when calling this function.
850 */
851int trace_ust_pid_tracker_lookup(struct ltt_ust_session *session, int pid)
852{
853 struct lttng_ht_iter iter;
854
855 if (!session->pid_tracker.ht) {
856 return 1;
857 }
858 if (pid_tracker_lookup(&session->pid_tracker, pid, &iter)) {
859 return 1;
860 }
861 return 0;
862}
863
864/*
865 * Called with the session lock held.
866 */
867int trace_ust_track_pid(struct ltt_ust_session *session, int pid)
868{
869 int retval = LTTNG_OK;
88e3c2f5 870 bool should_update_apps = false;
a9ad0c8f
MD
871
872 if (pid == -1) {
873 /* Track all pids: destroy tracker if exists. */
874 if (session->pid_tracker.ht) {
875 fini_pid_tracker(&session->pid_tracker);
876 /* Ensure all apps have session. */
88e3c2f5 877 should_update_apps = true;
a9ad0c8f
MD
878 }
879 } else {
880 int ret;
881
882 if (!session->pid_tracker.ht) {
883 /* Create tracker. */
884 if (init_pid_tracker(&session->pid_tracker)) {
885 ERR("Error initializing PID tracker");
886 retval = LTTNG_ERR_NOMEM;
887 goto end;
888 }
889 ret = pid_tracker_add_pid(&session->pid_tracker, pid);
890 if (ret != LTTNG_OK) {
891 retval = ret;
892 fini_pid_tracker(&session->pid_tracker);
893 goto end;
894 }
895 /* Remove all apps from session except pid. */
88e3c2f5 896 should_update_apps = true;
a9ad0c8f
MD
897 } else {
898 struct ust_app *app;
899
900 ret = pid_tracker_add_pid(&session->pid_tracker, pid);
901 if (ret != LTTNG_OK) {
902 retval = ret;
903 goto end;
904 }
905 /* Add session to application */
906 app = ust_app_find_by_pid(pid);
907 if (app) {
88e3c2f5 908 should_update_apps = true;
a9ad0c8f
MD
909 }
910 }
911 }
88e3c2f5
JG
912 if (should_update_apps && session->active) {
913 ust_app_global_update_all(session);
914 }
a9ad0c8f
MD
915end:
916 return retval;
917}
918
919/*
920 * Called with the session lock held.
921 */
922int trace_ust_untrack_pid(struct ltt_ust_session *session, int pid)
923{
924 int retval = LTTNG_OK;
925
926 if (pid == -1) {
927 /* Create empty tracker, replace old tracker. */
928 struct ust_pid_tracker tmp_tracker;
929
930 tmp_tracker = session->pid_tracker;
931 if (init_pid_tracker(&session->pid_tracker)) {
932 ERR("Error initializing PID tracker");
933 retval = LTTNG_ERR_NOMEM;
934 /* Rollback operation. */
935 session->pid_tracker = tmp_tracker;
936 goto end;
937 }
938 fini_pid_tracker(&tmp_tracker);
939
940 /* Remove session from all applications */
941 ust_app_global_update_all(session);
942 } else {
943 int ret;
944 struct ust_app *app;
945
946 if (!session->pid_tracker.ht) {
b894343d
JG
947 /* No PID being tracked. */
948 retval = LTTNG_ERR_PID_NOT_TRACKED;
a9ad0c8f
MD
949 goto end;
950 }
951 /* Remove PID from tracker */
952 ret = pid_tracker_del_pid(&session->pid_tracker, pid);
953 if (ret != LTTNG_OK) {
954 retval = ret;
955 goto end;
956 }
957 /* Remove session from application. */
958 app = ust_app_find_by_pid(pid);
959 if (app) {
960 ust_app_global_update(session, app);
961 }
962 }
963end:
964 return retval;
965}
966
a5dfbb9d
MD
967/*
968 * Called with session lock held.
969 */
970ssize_t trace_ust_list_tracker_pids(struct ltt_ust_session *session,
971 int32_t **_pids)
972{
973 struct ust_pid_tracker_node *tracker_node;
974 struct lttng_ht_iter iter;
975 unsigned long count, i = 0;
976 long approx[2];
977 int32_t *pids;
978 int ret = 0;
979
980 if (!session->pid_tracker.ht) {
981 /* Tracker disabled. Set first entry to -1. */
982 pids = zmalloc(sizeof(*pids));
983 if (!pids) {
984 ret = -1;
985 goto end;
986 }
987 pids[0] = -1;
988 *_pids = pids;
989 return 1;
990 }
991
992 rcu_read_lock();
993 cds_lfht_count_nodes(session->pid_tracker.ht->ht,
994 &approx[0], &count, &approx[1]);
995 pids = zmalloc(sizeof(*pids) * count);
996 if (!pids) {
997 ret = -1;
998 goto end;
999 }
1000 cds_lfht_for_each_entry(session->pid_tracker.ht->ht,
1001 &iter.iter, tracker_node, node.node) {
1002 pids[i++] = tracker_node->node.key;
1003 }
1004 *_pids = pids;
1005 ret = count;
1006end:
1007 rcu_read_unlock();
1008 return ret;
1009}
1010
f6a9efaa
DG
1011/*
1012 * RCU safe free context structure.
1013 */
1014static void destroy_context_rcu(struct rcu_head *head)
1015{
bec39940
DG
1016 struct lttng_ht_node_ulong *node =
1017 caa_container_of(head, struct lttng_ht_node_ulong, head);
f6a9efaa
DG
1018 struct ltt_ust_context *ctx =
1019 caa_container_of(node, struct ltt_ust_context, node);
1020
bdf64013 1021 trace_ust_destroy_context(ctx);
f6a9efaa
DG
1022}
1023
1024/*
1025 * Cleanup UST context hash table.
1026 */
7bd39047 1027static void destroy_contexts(struct lttng_ht *ht)
f6a9efaa
DG
1028{
1029 int ret;
bec39940
DG
1030 struct lttng_ht_node_ulong *node;
1031 struct lttng_ht_iter iter;
31746f93 1032 struct ltt_ust_context *ctx;
f6a9efaa 1033
0525e9ae
DG
1034 assert(ht);
1035
36b588ed 1036 rcu_read_lock();
bec39940 1037 cds_lfht_for_each_entry(ht->ht, &iter.iter, node, node) {
31746f93
DG
1038 /* Remove from ordered list. */
1039 ctx = caa_container_of(node, struct ltt_ust_context, node);
1040 cds_list_del(&ctx->list);
1041 /* Remove from channel's hash table. */
bec39940 1042 ret = lttng_ht_del(ht, &iter);
f6a9efaa
DG
1043 if (!ret) {
1044 call_rcu(&node->head, destroy_context_rcu);
1045 }
f6a9efaa 1046 }
36b588ed 1047 rcu_read_unlock();
ed52805d 1048
0b2dc8df 1049 ht_cleanup_push(ht);
f6a9efaa
DG
1050}
1051
97ee3a89
DG
1052/*
1053 * Cleanup ust event structure.
1054 */
1055void trace_ust_destroy_event(struct ltt_ust_event *event)
1056{
0525e9ae
DG
1057 assert(event);
1058
f6a9efaa 1059 DBG2("Trace destroy UST event %s", event->attr.name);
6b453b5e 1060 free(event->filter_expression);
53a80697 1061 free(event->filter);
40024f8a 1062 free(event->exclusion);
97ee3a89
DG
1063 free(event);
1064}
1065
bdf64013
JG
1066/*
1067 * Cleanup ust context structure.
1068 */
1069void trace_ust_destroy_context(struct ltt_ust_context *ctx)
1070{
1071 assert(ctx);
1072
1073 if (ctx->ctx.ctx == LTTNG_UST_CONTEXT_APP_CONTEXT) {
1074 free(ctx->ctx.u.app_ctx.provider_name);
1075 free(ctx->ctx.u.app_ctx.ctx_name);
1076 }
1077 free(ctx);
1078}
1079
f6a9efaa
DG
1080/*
1081 * URCU intermediate call to complete destroy event.
1082 */
1083static void destroy_event_rcu(struct rcu_head *head)
1084{
bec39940
DG
1085 struct lttng_ht_node_str *node =
1086 caa_container_of(head, struct lttng_ht_node_str, head);
f6a9efaa
DG
1087 struct ltt_ust_event *event =
1088 caa_container_of(node, struct ltt_ust_event, node);
1089
1090 trace_ust_destroy_event(event);
1091}
1092
284d8f55
DG
1093/*
1094 * Cleanup UST events hashtable.
1095 */
7bd39047 1096static void destroy_events(struct lttng_ht *events)
ed52805d
DG
1097{
1098 int ret;
bec39940
DG
1099 struct lttng_ht_node_str *node;
1100 struct lttng_ht_iter iter;
ed52805d 1101
0525e9ae
DG
1102 assert(events);
1103
36b588ed 1104 rcu_read_lock();
bec39940
DG
1105 cds_lfht_for_each_entry(events->ht, &iter.iter, node, node) {
1106 ret = lttng_ht_del(events, &iter);
7bd39047
DG
1107 assert(!ret);
1108 call_rcu(&node->head, destroy_event_rcu);
ed52805d 1109 }
36b588ed 1110 rcu_read_unlock();
ed52805d 1111
0b2dc8df 1112 ht_cleanup_push(events);
ed52805d
DG
1113}
1114
97ee3a89
DG
1115/*
1116 * Cleanup ust channel structure.
36b588ed
MD
1117 *
1118 * Should _NOT_ be called with RCU read lock held.
97ee3a89 1119 */
36b588ed 1120static void _trace_ust_destroy_channel(struct ltt_ust_channel *channel)
97ee3a89 1121{
0525e9ae
DG
1122 assert(channel);
1123
f6a9efaa 1124 DBG2("Trace destroy UST channel %s", channel->name);
97ee3a89 1125
97ee3a89 1126 free(channel);
f6a9efaa
DG
1127}
1128
1129/*
1130 * URCU intermediate call to complete destroy channel.
1131 */
1132static void destroy_channel_rcu(struct rcu_head *head)
1133{
bec39940
DG
1134 struct lttng_ht_node_str *node =
1135 caa_container_of(head, struct lttng_ht_node_str, head);
f6a9efaa
DG
1136 struct ltt_ust_channel *channel =
1137 caa_container_of(node, struct ltt_ust_channel, node);
1138
36b588ed
MD
1139 _trace_ust_destroy_channel(channel);
1140}
1141
1142void trace_ust_destroy_channel(struct ltt_ust_channel *channel)
1143{
627cbbe7
MD
1144 /* Destroying all events of the channel */
1145 destroy_events(channel->events);
1146 /* Destroying all context of the channel */
1147 destroy_contexts(channel->ctx);
1148
36b588ed 1149 call_rcu(&channel->node.head, destroy_channel_rcu);
97ee3a89
DG
1150}
1151
d5979e4a
DG
1152/*
1153 * Remove an UST channel from a channel HT.
1154 */
1155void trace_ust_delete_channel(struct lttng_ht *ht,
1156 struct ltt_ust_channel *channel)
1157{
1158 int ret;
1159 struct lttng_ht_iter iter;
1160
1161 assert(ht);
1162 assert(channel);
1163
1164 iter.iter.node = &channel->node.node;
1165 ret = lttng_ht_del(ht, &iter);
1166 assert(!ret);
1167}
1168
97ee3a89 1169/*
f6a9efaa 1170 * Iterate over a hash table containing channels and cleanup safely.
97ee3a89 1171 */
bec39940 1172static void destroy_channels(struct lttng_ht *channels)
f6a9efaa 1173{
bec39940
DG
1174 struct lttng_ht_node_str *node;
1175 struct lttng_ht_iter iter;
f6a9efaa 1176
0525e9ae
DG
1177 assert(channels);
1178
24d1723f 1179 rcu_read_lock();
bec39940 1180 cds_lfht_for_each_entry(channels->ht, &iter.iter, node, node) {
627cbbe7
MD
1181 struct ltt_ust_channel *chan =
1182 caa_container_of(node, struct ltt_ust_channel, node);
1183
1184 trace_ust_delete_channel(channels, chan);
1185 trace_ust_destroy_channel(chan);
f6a9efaa 1186 }
36b588ed 1187 rcu_read_unlock();
ed52805d 1188
0b2dc8df 1189 ht_cleanup_push(channels);
f6a9efaa
DG
1190}
1191
f6a9efaa
DG
1192/*
1193 * Cleanup UST global domain.
1194 */
1195static void destroy_domain_global(struct ltt_ust_domain_global *dom)
1196{
0525e9ae
DG
1197 assert(dom);
1198
f6a9efaa
DG
1199 destroy_channels(dom->channels);
1200}
97ee3a89 1201
f6a9efaa 1202/*
d070c424
MD
1203 * Cleanup ust session structure, keeping data required by
1204 * destroy notifier.
36b588ed
MD
1205 *
1206 * Should *NOT* be called with RCU read-side lock held.
f6a9efaa
DG
1207 */
1208void trace_ust_destroy_session(struct ltt_ust_session *session)
1209{
fefd409b 1210 struct agent *agt;
7972aab2 1211 struct buffer_reg_uid *reg, *sreg;
fefd409b 1212 struct lttng_ht_iter iter;
7972aab2 1213
0525e9ae 1214 assert(session);
97ee3a89 1215
d9bf3ca4 1216 DBG2("Trace UST destroy session %" PRIu64, session->id);
f6a9efaa 1217
f6a9efaa
DG
1218 /* Cleaning up UST domain */
1219 destroy_domain_global(&session->domain_global);
fefd409b 1220
0c0fcd77 1221 rcu_read_lock();
fefd409b 1222 cds_lfht_for_each_entry(session->agents->ht, &iter.iter, agt, node.node) {
d0edf546
JG
1223 int ret = lttng_ht_del(session->agents, &iter);
1224
1225 assert(!ret);
fefd409b
DG
1226 agent_destroy(agt);
1227 }
0c0fcd77 1228 rcu_read_unlock();
7972aab2 1229
8ada2175
MD
1230 ht_cleanup_push(session->agents);
1231
7972aab2
DG
1232 /* Cleanup UID buffer registry object(s). */
1233 cds_list_for_each_entry_safe(reg, sreg, &session->buffer_reg_uid_list,
1234 lnode) {
1235 cds_list_del(&reg->lnode);
1236 buffer_reg_uid_remove(reg);
1237 buffer_reg_uid_destroy(reg, session->consumer);
1238 }
44d3bd01 1239
a9ad0c8f 1240 fini_pid_tracker(&session->pid_tracker);
82b69413 1241 lttng_trace_chunk_put(session->current_trace_chunk);
d070c424
MD
1242}
1243
1244/* Free elements needed by destroy notifiers. */
1245void trace_ust_free_session(struct ltt_ust_session *session)
1246{
1247 consumer_output_put(session->consumer);
97ee3a89
DG
1248 free(session);
1249}
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