Add jul-app ABI/API and handle registration
[lttng-tools.git] / src / bin / lttng-sessiond / cmd.c
CommitLineData
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1/*
2 * Copyright (C) 2012 - David Goulet <dgoulet@efficios.com>
3 *
4 * This program is free software; you can redistribute it and/or modify it
5 * under the terms of the GNU General Public License, version 2 only, as
6 * published by the Free Software Foundation.
7 *
8 * This program is distributed in the hope that it will be useful, but WITHOUT
9 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
10 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
11 * more details.
12 *
13 * You should have received a copy of the GNU General Public License along with
14 * this program; if not, write to the Free Software Foundation, Inc., 51
15 * Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
16 */
17
18#define _GNU_SOURCE
19#include <assert.h>
6dc3064a 20#include <inttypes.h>
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21#include <urcu/list.h>
22#include <urcu/uatomic.h>
23
24#include <common/defaults.h>
25#include <common/common.h>
26#include <common/sessiond-comm/sessiond-comm.h>
27#include <common/relayd/relayd.h>
10a50311 28#include <common/utils.h>
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29
30#include "channel.h"
31#include "consumer.h"
32#include "event.h"
8782cc74 33#include "health-sessiond.h"
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34#include "kernel.h"
35#include "kernel-consumer.h"
36#include "lttng-sessiond.h"
37#include "utils.h"
38
39#include "cmd.h"
40
41/*
42 * Used to keep a unique index for each relayd socket created where this value
43 * is associated with streams on the consumer so it can match the right relayd
d88aee68
DG
44 * to send to. It must be accessed with the relayd_net_seq_idx_lock
45 * held.
2f77fc4b 46 */
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47static pthread_mutex_t relayd_net_seq_idx_lock = PTHREAD_MUTEX_INITIALIZER;
48static uint64_t relayd_net_seq_idx;
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49
50/*
51 * Create a session path used by list_lttng_sessions for the case that the
52 * session consumer is on the network.
53 */
54static int build_network_session_path(char *dst, size_t size,
55 struct ltt_session *session)
56{
57 int ret, kdata_port, udata_port;
58 struct lttng_uri *kuri = NULL, *uuri = NULL, *uri = NULL;
59 char tmp_uurl[PATH_MAX], tmp_urls[PATH_MAX];
60
61 assert(session);
62 assert(dst);
63
64 memset(tmp_urls, 0, sizeof(tmp_urls));
65 memset(tmp_uurl, 0, sizeof(tmp_uurl));
66
67 kdata_port = udata_port = DEFAULT_NETWORK_DATA_PORT;
68
69 if (session->kernel_session && session->kernel_session->consumer) {
70 kuri = &session->kernel_session->consumer->dst.net.control;
71 kdata_port = session->kernel_session->consumer->dst.net.data.port;
72 }
73
74 if (session->ust_session && session->ust_session->consumer) {
75 uuri = &session->ust_session->consumer->dst.net.control;
76 udata_port = session->ust_session->consumer->dst.net.data.port;
77 }
78
79 if (uuri == NULL && kuri == NULL) {
80 uri = &session->consumer->dst.net.control;
81 kdata_port = session->consumer->dst.net.data.port;
82 } else if (kuri && uuri) {
83 ret = uri_compare(kuri, uuri);
84 if (ret) {
85 /* Not Equal */
86 uri = kuri;
87 /* Build uuri URL string */
88 ret = uri_to_str_url(uuri, tmp_uurl, sizeof(tmp_uurl));
89 if (ret < 0) {
90 goto error;
91 }
92 } else {
93 uri = kuri;
94 }
95 } else if (kuri && uuri == NULL) {
96 uri = kuri;
97 } else if (uuri && kuri == NULL) {
98 uri = uuri;
99 }
100
101 ret = uri_to_str_url(uri, tmp_urls, sizeof(tmp_urls));
102 if (ret < 0) {
103 goto error;
104 }
105
9aa9f900
DG
106 /*
107 * Do we have a UST url set. If yes, this means we have both kernel and UST
108 * to print.
109 */
9d035200 110 if (*tmp_uurl != '\0') {
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111 ret = snprintf(dst, size, "[K]: %s [data: %d] -- [U]: %s [data: %d]",
112 tmp_urls, kdata_port, tmp_uurl, udata_port);
113 } else {
9aa9f900 114 int dport;
bef08707 115 if (kuri || (!kuri && !uuri)) {
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116 dport = kdata_port;
117 } else {
118 /* No kernel URI, use the UST port. */
119 dport = udata_port;
120 }
121 ret = snprintf(dst, size, "%s [data: %d]", tmp_urls, dport);
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122 }
123
124error:
125 return ret;
126}
127
128/*
129 * Fill lttng_channel array of all channels.
130 */
131static void list_lttng_channels(int domain, struct ltt_session *session,
132 struct lttng_channel *channels)
133{
134 int i = 0;
135 struct ltt_kernel_channel *kchan;
136
137 DBG("Listing channels for session %s", session->name);
138
139 switch (domain) {
140 case LTTNG_DOMAIN_KERNEL:
141 /* Kernel channels */
142 if (session->kernel_session != NULL) {
143 cds_list_for_each_entry(kchan,
144 &session->kernel_session->channel_list.head, list) {
145 /* Copy lttng_channel struct to array */
146 memcpy(&channels[i], kchan->channel, sizeof(struct lttng_channel));
147 channels[i].enabled = kchan->enabled;
148 i++;
149 }
150 }
151 break;
152 case LTTNG_DOMAIN_UST:
153 {
154 struct lttng_ht_iter iter;
155 struct ltt_ust_channel *uchan;
156
e7fe706f 157 rcu_read_lock();
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158 cds_lfht_for_each_entry(session->ust_session->domain_global.channels->ht,
159 &iter.iter, uchan, node.node) {
160 strncpy(channels[i].name, uchan->name, LTTNG_SYMBOL_NAME_LEN);
161 channels[i].attr.overwrite = uchan->attr.overwrite;
162 channels[i].attr.subbuf_size = uchan->attr.subbuf_size;
163 channels[i].attr.num_subbuf = uchan->attr.num_subbuf;
164 channels[i].attr.switch_timer_interval =
165 uchan->attr.switch_timer_interval;
166 channels[i].attr.read_timer_interval =
167 uchan->attr.read_timer_interval;
168 channels[i].enabled = uchan->enabled;
169 switch (uchan->attr.output) {
170 case LTTNG_UST_MMAP:
171 default:
172 channels[i].attr.output = LTTNG_EVENT_MMAP;
173 break;
174 }
175 i++;
176 }
e7fe706f 177 rcu_read_unlock();
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178 break;
179 }
180 default:
181 break;
182 }
183}
184
185/*
186 * Create a list of ust global domain events.
187 */
188static int list_lttng_ust_global_events(char *channel_name,
189 struct ltt_ust_domain_global *ust_global, struct lttng_event **events)
190{
191 int i = 0, ret = 0;
192 unsigned int nb_event = 0;
193 struct lttng_ht_iter iter;
194 struct lttng_ht_node_str *node;
195 struct ltt_ust_channel *uchan;
196 struct ltt_ust_event *uevent;
197 struct lttng_event *tmp;
198
199 DBG("Listing UST global events for channel %s", channel_name);
200
201 rcu_read_lock();
202
203 lttng_ht_lookup(ust_global->channels, (void *)channel_name, &iter);
204 node = lttng_ht_iter_get_node_str(&iter);
205 if (node == NULL) {
f73fabfd 206 ret = LTTNG_ERR_UST_CHAN_NOT_FOUND;
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207 goto error;
208 }
209
210 uchan = caa_container_of(&node->node, struct ltt_ust_channel, node.node);
211
212 nb_event += lttng_ht_get_count(uchan->events);
213
214 if (nb_event == 0) {
215 ret = nb_event;
216 goto error;
217 }
218
219 DBG3("Listing UST global %d events", nb_event);
220
221 tmp = zmalloc(nb_event * sizeof(struct lttng_event));
222 if (tmp == NULL) {
f73fabfd 223 ret = LTTNG_ERR_FATAL;
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224 goto error;
225 }
226
227 cds_lfht_for_each_entry(uchan->events->ht, &iter.iter, uevent, node.node) {
228 strncpy(tmp[i].name, uevent->attr.name, LTTNG_SYMBOL_NAME_LEN);
229 tmp[i].name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0';
230 tmp[i].enabled = uevent->enabled;
231
232 switch (uevent->attr.instrumentation) {
233 case LTTNG_UST_TRACEPOINT:
234 tmp[i].type = LTTNG_EVENT_TRACEPOINT;
235 break;
236 case LTTNG_UST_PROBE:
237 tmp[i].type = LTTNG_EVENT_PROBE;
238 break;
239 case LTTNG_UST_FUNCTION:
240 tmp[i].type = LTTNG_EVENT_FUNCTION;
241 break;
242 }
243
244 tmp[i].loglevel = uevent->attr.loglevel;
245 switch (uevent->attr.loglevel_type) {
246 case LTTNG_UST_LOGLEVEL_ALL:
247 tmp[i].loglevel_type = LTTNG_EVENT_LOGLEVEL_ALL;
248 break;
249 case LTTNG_UST_LOGLEVEL_RANGE:
250 tmp[i].loglevel_type = LTTNG_EVENT_LOGLEVEL_RANGE;
251 break;
252 case LTTNG_UST_LOGLEVEL_SINGLE:
253 tmp[i].loglevel_type = LTTNG_EVENT_LOGLEVEL_SINGLE;
254 break;
255 }
256 if (uevent->filter) {
257 tmp[i].filter = 1;
258 }
259 i++;
260 }
261
262 ret = nb_event;
263 *events = tmp;
264
265error:
266 rcu_read_unlock();
267 return ret;
268}
269
270/*
271 * Fill lttng_event array of all kernel events in the channel.
272 */
273static int list_lttng_kernel_events(char *channel_name,
274 struct ltt_kernel_session *kernel_session, struct lttng_event **events)
275{
276 int i = 0, ret;
277 unsigned int nb_event;
278 struct ltt_kernel_event *event;
279 struct ltt_kernel_channel *kchan;
280
281 kchan = trace_kernel_get_channel_by_name(channel_name, kernel_session);
282 if (kchan == NULL) {
f73fabfd 283 ret = LTTNG_ERR_KERN_CHAN_NOT_FOUND;
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284 goto error;
285 }
286
287 nb_event = kchan->event_count;
288
289 DBG("Listing events for channel %s", kchan->channel->name);
290
291 if (nb_event == 0) {
f73fabfd 292 goto end;
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293 }
294
295 *events = zmalloc(nb_event * sizeof(struct lttng_event));
296 if (*events == NULL) {
f73fabfd 297 ret = LTTNG_ERR_FATAL;
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298 goto error;
299 }
300
301 /* Kernel channels */
302 cds_list_for_each_entry(event, &kchan->events_list.head , list) {
303 strncpy((*events)[i].name, event->event->name, LTTNG_SYMBOL_NAME_LEN);
304 (*events)[i].name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0';
305 (*events)[i].enabled = event->enabled;
306
307 switch (event->event->instrumentation) {
308 case LTTNG_KERNEL_TRACEPOINT:
309 (*events)[i].type = LTTNG_EVENT_TRACEPOINT;
310 break;
2f77fc4b 311 case LTTNG_KERNEL_KRETPROBE:
1896972b
DG
312 (*events)[i].type = LTTNG_EVENT_FUNCTION;
313 memcpy(&(*events)[i].attr.probe, &event->event->u.kprobe,
314 sizeof(struct lttng_kernel_kprobe));
315 break;
316 case LTTNG_KERNEL_KPROBE:
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DG
317 (*events)[i].type = LTTNG_EVENT_PROBE;
318 memcpy(&(*events)[i].attr.probe, &event->event->u.kprobe,
319 sizeof(struct lttng_kernel_kprobe));
320 break;
321 case LTTNG_KERNEL_FUNCTION:
322 (*events)[i].type = LTTNG_EVENT_FUNCTION;
323 memcpy(&((*events)[i].attr.ftrace), &event->event->u.ftrace,
324 sizeof(struct lttng_kernel_function));
325 break;
326 case LTTNG_KERNEL_NOOP:
327 (*events)[i].type = LTTNG_EVENT_NOOP;
328 break;
329 case LTTNG_KERNEL_SYSCALL:
330 (*events)[i].type = LTTNG_EVENT_SYSCALL;
331 break;
332 case LTTNG_KERNEL_ALL:
333 assert(0);
334 break;
335 }
336 i++;
337 }
338
f73fabfd 339end:
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340 return nb_event;
341
342error:
f73fabfd
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343 /* Negate the error code to differentiate the size from an error */
344 return -ret;
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345}
346
347/*
348 * Add URI so the consumer output object. Set the correct path depending on the
349 * domain adding the default trace directory.
350 */
351static int add_uri_to_consumer(struct consumer_output *consumer,
352 struct lttng_uri *uri, int domain, const char *session_name)
353{
f73fabfd 354 int ret = LTTNG_OK;
2f77fc4b
DG
355 const char *default_trace_dir;
356
357 assert(uri);
358
359 if (consumer == NULL) {
360 DBG("No consumer detected. Don't add URI. Stopping.");
f73fabfd 361 ret = LTTNG_ERR_NO_CONSUMER;
2f77fc4b
DG
362 goto error;
363 }
364
365 switch (domain) {
366 case LTTNG_DOMAIN_KERNEL:
367 default_trace_dir = DEFAULT_KERNEL_TRACE_DIR;
368 break;
369 case LTTNG_DOMAIN_UST:
370 default_trace_dir = DEFAULT_UST_TRACE_DIR;
371 break;
372 default:
373 /*
374 * This case is possible is we try to add the URI to the global tracing
375 * session consumer object which in this case there is no subdir.
376 */
377 default_trace_dir = "";
378 }
379
380 switch (uri->dtype) {
381 case LTTNG_DST_IPV4:
382 case LTTNG_DST_IPV6:
383 DBG2("Setting network URI to consumer");
384
df75acac
DG
385 if (consumer->type == CONSUMER_DST_NET) {
386 if ((uri->stype == LTTNG_STREAM_CONTROL &&
785d2d0d
DG
387 consumer->dst.net.control_isset) ||
388 (uri->stype == LTTNG_STREAM_DATA &&
389 consumer->dst.net.data_isset)) {
df75acac
DG
390 ret = LTTNG_ERR_URL_EXIST;
391 goto error;
392 }
393 } else {
394 memset(&consumer->dst.net, 0, sizeof(consumer->dst.net));
785d2d0d
DG
395 }
396
df75acac
DG
397 consumer->type = CONSUMER_DST_NET;
398
2f77fc4b
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399 /* Set URI into consumer output object */
400 ret = consumer_set_network_uri(consumer, uri);
401 if (ret < 0) {
a74934ba 402 ret = -ret;
2f77fc4b
DG
403 goto error;
404 } else if (ret == 1) {
405 /*
406 * URI was the same in the consumer so we do not append the subdir
407 * again so to not duplicate output dir.
408 */
409 goto error;
410 }
411
412 if (uri->stype == LTTNG_STREAM_CONTROL && strlen(uri->subdir) == 0) {
413 ret = consumer_set_subdir(consumer, session_name);
414 if (ret < 0) {
f73fabfd 415 ret = LTTNG_ERR_FATAL;
2f77fc4b
DG
416 goto error;
417 }
418 }
419
420 if (uri->stype == LTTNG_STREAM_CONTROL) {
421 /* On a new subdir, reappend the default trace dir. */
c30ce0b3
CB
422 strncat(consumer->subdir, default_trace_dir,
423 sizeof(consumer->subdir) - strlen(consumer->subdir) - 1);
2f77fc4b
DG
424 DBG3("Append domain trace name to subdir %s", consumer->subdir);
425 }
426
427 break;
428 case LTTNG_DST_PATH:
429 DBG2("Setting trace directory path from URI to %s", uri->dst.path);
430 memset(consumer->dst.trace_path, 0,
431 sizeof(consumer->dst.trace_path));
432 strncpy(consumer->dst.trace_path, uri->dst.path,
433 sizeof(consumer->dst.trace_path));
434 /* Append default trace dir */
435 strncat(consumer->dst.trace_path, default_trace_dir,
c30ce0b3
CB
436 sizeof(consumer->dst.trace_path) -
437 strlen(consumer->dst.trace_path) - 1);
2f77fc4b
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438 /* Flag consumer as local. */
439 consumer->type = CONSUMER_DST_LOCAL;
440 break;
441 }
442
a74934ba
DG
443 ret = LTTNG_OK;
444
2f77fc4b
DG
445error:
446 return ret;
447}
448
449/*
450 * Init tracing by creating trace directory and sending fds kernel consumer.
451 */
452static int init_kernel_tracing(struct ltt_kernel_session *session)
453{
454 int ret = 0;
455 struct lttng_ht_iter iter;
456 struct consumer_socket *socket;
457
458 assert(session);
459
e7fe706f
DG
460 rcu_read_lock();
461
2f77fc4b
DG
462 if (session->consumer_fds_sent == 0 && session->consumer != NULL) {
463 cds_lfht_for_each_entry(session->consumer->socks->ht, &iter.iter,
464 socket, node.node) {
2f77fc4b 465 pthread_mutex_lock(socket->lock);
f50f23d9 466 ret = kernel_consumer_send_session(socket, session);
2f77fc4b
DG
467 pthread_mutex_unlock(socket->lock);
468 if (ret < 0) {
f73fabfd 469 ret = LTTNG_ERR_KERN_CONSUMER_FAIL;
2f77fc4b
DG
470 goto error;
471 }
472 }
473 }
474
475error:
e7fe706f 476 rcu_read_unlock();
2f77fc4b
DG
477 return ret;
478}
479
480/*
481 * Create a socket to the relayd using the URI.
482 *
483 * On success, the relayd_sock pointer is set to the created socket.
484 * Else, it's stays untouched and a lttcomm error code is returned.
485 */
6151a90f
JD
486static int create_connect_relayd(struct lttng_uri *uri,
487 struct lttcomm_relayd_sock **relayd_sock)
2f77fc4b
DG
488{
489 int ret;
6151a90f 490 struct lttcomm_relayd_sock *rsock;
2f77fc4b 491
6151a90f
JD
492 rsock = lttcomm_alloc_relayd_sock(uri, RELAYD_VERSION_COMM_MAJOR,
493 RELAYD_VERSION_COMM_MINOR);
494 if (!rsock) {
f73fabfd 495 ret = LTTNG_ERR_FATAL;
2f77fc4b
DG
496 goto error;
497 }
498
ffe60014
DG
499 /*
500 * Connect to relayd so we can proceed with a session creation. This call
501 * can possibly block for an arbitrary amount of time to set the health
502 * state to be in poll execution.
503 */
504 health_poll_entry();
6151a90f 505 ret = relayd_connect(rsock);
ffe60014 506 health_poll_exit();
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507 if (ret < 0) {
508 ERR("Unable to reach lttng-relayd");
f73fabfd 509 ret = LTTNG_ERR_RELAYD_CONNECT_FAIL;
2f77fc4b
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510 goto free_sock;
511 }
512
513 /* Create socket for control stream. */
514 if (uri->stype == LTTNG_STREAM_CONTROL) {
515 DBG3("Creating relayd stream socket from URI");
516
517 /* Check relayd version */
6151a90f 518 ret = relayd_version_check(rsock);
2f77fc4b 519 if (ret < 0) {
f73fabfd 520 ret = LTTNG_ERR_RELAYD_VERSION_FAIL;
2f77fc4b
DG
521 goto close_sock;
522 }
523 } else if (uri->stype == LTTNG_STREAM_DATA) {
524 DBG3("Creating relayd data socket from URI");
525 } else {
526 /* Command is not valid */
527 ERR("Relayd invalid stream type: %d", uri->stype);
f73fabfd 528 ret = LTTNG_ERR_INVALID;
2f77fc4b
DG
529 goto close_sock;
530 }
531
6151a90f 532 *relayd_sock = rsock;
2f77fc4b 533
f73fabfd 534 return LTTNG_OK;
2f77fc4b
DG
535
536close_sock:
6151a90f
JD
537 /* The returned value is not useful since we are on an error path. */
538 (void) relayd_close(rsock);
2f77fc4b 539free_sock:
6151a90f 540 free(rsock);
2f77fc4b
DG
541error:
542 return ret;
543}
544
545/*
546 * Connect to the relayd using URI and send the socket to the right consumer.
547 */
6dc3064a 548static int send_consumer_relayd_socket(int domain, unsigned int session_id,
2f77fc4b 549 struct lttng_uri *relayd_uri, struct consumer_output *consumer,
d3e2ba59
JD
550 struct consumer_socket *consumer_sock,
551 char *session_name, char *hostname, int session_live_timer)
2f77fc4b
DG
552{
553 int ret;
6151a90f 554 struct lttcomm_relayd_sock *rsock = NULL;
2f77fc4b 555
ffe60014 556 /* Connect to relayd and make version check if uri is the control. */
6151a90f 557 ret = create_connect_relayd(relayd_uri, &rsock);
ffe60014 558 if (ret != LTTNG_OK) {
6151a90f 559 goto error;
ffe60014 560 }
6151a90f 561 assert(rsock);
ffe60014 562
2f77fc4b 563 /* Set the network sequence index if not set. */
d88aee68
DG
564 if (consumer->net_seq_index == (uint64_t) -1ULL) {
565 pthread_mutex_lock(&relayd_net_seq_idx_lock);
2f77fc4b
DG
566 /*
567 * Increment net_seq_idx because we are about to transfer the
568 * new relayd socket to the consumer.
d88aee68 569 * Assign unique key so the consumer can match streams.
2f77fc4b 570 */
d88aee68
DG
571 consumer->net_seq_index = ++relayd_net_seq_idx;
572 pthread_mutex_unlock(&relayd_net_seq_idx_lock);
2f77fc4b
DG
573 }
574
2f77fc4b 575 /* Send relayd socket to consumer. */
6151a90f 576 ret = consumer_send_relayd_socket(consumer_sock, rsock, consumer,
d3e2ba59
JD
577 relayd_uri->stype, session_id,
578 session_name, hostname, session_live_timer);
2f77fc4b 579 if (ret < 0) {
f73fabfd 580 ret = LTTNG_ERR_ENABLE_CONSUMER_FAIL;
2f77fc4b
DG
581 goto close_sock;
582 }
583
c890b720
DG
584 /* Flag that the corresponding socket was sent. */
585 if (relayd_uri->stype == LTTNG_STREAM_CONTROL) {
ffe60014 586 consumer_sock->control_sock_sent = 1;
c890b720 587 } else if (relayd_uri->stype == LTTNG_STREAM_DATA) {
ffe60014 588 consumer_sock->data_sock_sent = 1;
c890b720
DG
589 }
590
f73fabfd 591 ret = LTTNG_OK;
2f77fc4b
DG
592
593 /*
594 * Close socket which was dup on the consumer side. The session daemon does
595 * NOT keep track of the relayd socket(s) once transfer to the consumer.
596 */
597
598close_sock:
6151a90f
JD
599 (void) relayd_close(rsock);
600 free(rsock);
2f77fc4b 601
6151a90f 602error:
ffe60014
DG
603 if (ret != LTTNG_OK) {
604 /*
d9078d0c
DG
605 * The consumer output for this session should not be used anymore
606 * since the relayd connection failed thus making any tracing or/and
607 * streaming not usable.
ffe60014 608 */
d9078d0c 609 consumer->enabled = 0;
ffe60014 610 }
2f77fc4b
DG
611 return ret;
612}
613
614/*
615 * Send both relayd sockets to a specific consumer and domain. This is a
616 * helper function to facilitate sending the information to the consumer for a
617 * session.
618 */
6dc3064a 619static int send_consumer_relayd_sockets(int domain, unsigned int session_id,
d3e2ba59
JD
620 struct consumer_output *consumer, struct consumer_socket *sock,
621 char *session_name, char *hostname, int session_live_timer)
2f77fc4b 622{
dda67f6c 623 int ret = LTTNG_OK;
2f77fc4b 624
2f77fc4b 625 assert(consumer);
6dc3064a 626 assert(sock);
2f77fc4b 627
2f77fc4b 628 /* Sending control relayd socket. */
ffe60014 629 if (!sock->control_sock_sent) {
6dc3064a 630 ret = send_consumer_relayd_socket(domain, session_id,
d3e2ba59
JD
631 &consumer->dst.net.control, consumer, sock,
632 session_name, hostname, session_live_timer);
c890b720
DG
633 if (ret != LTTNG_OK) {
634 goto error;
635 }
2f77fc4b
DG
636 }
637
638 /* Sending data relayd socket. */
ffe60014 639 if (!sock->data_sock_sent) {
6dc3064a 640 ret = send_consumer_relayd_socket(domain, session_id,
d3e2ba59
JD
641 &consumer->dst.net.data, consumer, sock,
642 session_name, hostname, session_live_timer);
c890b720
DG
643 if (ret != LTTNG_OK) {
644 goto error;
645 }
2f77fc4b
DG
646 }
647
2f77fc4b
DG
648error:
649 return ret;
650}
651
652/*
653 * Setup relayd connections for a tracing session. First creates the socket to
654 * the relayd and send them to the right domain consumer. Consumer type MUST be
655 * network.
656 */
ffe60014 657int cmd_setup_relayd(struct ltt_session *session)
2f77fc4b 658{
f73fabfd 659 int ret = LTTNG_OK;
2f77fc4b
DG
660 struct ltt_ust_session *usess;
661 struct ltt_kernel_session *ksess;
662 struct consumer_socket *socket;
663 struct lttng_ht_iter iter;
664
665 assert(session);
666
667 usess = session->ust_session;
668 ksess = session->kernel_session;
669
785d2d0d 670 DBG("Setting relayd for session %s", session->name);
2f77fc4b 671
e7fe706f
DG
672 rcu_read_lock();
673
2f77fc4b
DG
674 if (usess && usess->consumer && usess->consumer->type == CONSUMER_DST_NET
675 && usess->consumer->enabled) {
676 /* For each consumer socket, send relayd sockets */
677 cds_lfht_for_each_entry(usess->consumer->socks->ht, &iter.iter,
678 socket, node.node) {
2f77fc4b 679 pthread_mutex_lock(socket->lock);
6dc3064a 680 ret = send_consumer_relayd_sockets(LTTNG_DOMAIN_UST, session->id,
d3e2ba59
JD
681 usess->consumer, socket,
682 session->name, session->hostname,
683 session->live_timer);
2f77fc4b 684 pthread_mutex_unlock(socket->lock);
f73fabfd 685 if (ret != LTTNG_OK) {
2f77fc4b
DG
686 goto error;
687 }
6dc3064a
DG
688 /* Session is now ready for network streaming. */
689 session->net_handle = 1;
2f77fc4b
DG
690 }
691 }
692
693 if (ksess && ksess->consumer && ksess->consumer->type == CONSUMER_DST_NET
694 && ksess->consumer->enabled) {
695 cds_lfht_for_each_entry(ksess->consumer->socks->ht, &iter.iter,
696 socket, node.node) {
2f77fc4b 697 pthread_mutex_lock(socket->lock);
6dc3064a 698 ret = send_consumer_relayd_sockets(LTTNG_DOMAIN_KERNEL, session->id,
d3e2ba59
JD
699 ksess->consumer, socket,
700 session->name, session->hostname,
701 session->live_timer);
2f77fc4b 702 pthread_mutex_unlock(socket->lock);
f73fabfd 703 if (ret != LTTNG_OK) {
2f77fc4b
DG
704 goto error;
705 }
6dc3064a
DG
706 /* Session is now ready for network streaming. */
707 session->net_handle = 1;
2f77fc4b
DG
708 }
709 }
710
711error:
e7fe706f 712 rcu_read_unlock();
2f77fc4b
DG
713 return ret;
714}
715
9b6c7ec5
DG
716/*
717 * Start a kernel session by opening all necessary streams.
718 */
719static int start_kernel_session(struct ltt_kernel_session *ksess, int wpipe)
720{
721 int ret;
722 struct ltt_kernel_channel *kchan;
723
724 /* Open kernel metadata */
07b86b52 725 if (ksess->metadata == NULL && ksess->output_traces) {
9b6c7ec5
DG
726 ret = kernel_open_metadata(ksess);
727 if (ret < 0) {
728 ret = LTTNG_ERR_KERN_META_FAIL;
729 goto error;
730 }
731 }
732
733 /* Open kernel metadata stream */
07b86b52 734 if (ksess->metadata && ksess->metadata_stream_fd < 0) {
9b6c7ec5
DG
735 ret = kernel_open_metadata_stream(ksess);
736 if (ret < 0) {
737 ERR("Kernel create metadata stream failed");
738 ret = LTTNG_ERR_KERN_STREAM_FAIL;
739 goto error;
740 }
741 }
742
743 /* For each channel */
744 cds_list_for_each_entry(kchan, &ksess->channel_list.head, list) {
745 if (kchan->stream_count == 0) {
746 ret = kernel_open_channel_stream(kchan);
747 if (ret < 0) {
748 ret = LTTNG_ERR_KERN_STREAM_FAIL;
749 goto error;
750 }
751 /* Update the stream global counter */
752 ksess->stream_count_global += ret;
753 }
754 }
755
756 /* Setup kernel consumer socket and send fds to it */
757 ret = init_kernel_tracing(ksess);
e43c41c5 758 if (ret != 0) {
9b6c7ec5
DG
759 ret = LTTNG_ERR_KERN_START_FAIL;
760 goto error;
761 }
762
763 /* This start the kernel tracing */
764 ret = kernel_start_session(ksess);
765 if (ret < 0) {
766 ret = LTTNG_ERR_KERN_START_FAIL;
767 goto error;
768 }
769
770 /* Quiescent wait after starting trace */
784303b0 771 kernel_wait_quiescent(kernel_tracer_fd);
9b6c7ec5
DG
772
773 ksess->started = 1;
774
775 ret = LTTNG_OK;
776
777error:
778 return ret;
779}
780
2f77fc4b
DG
781/*
782 * Command LTTNG_DISABLE_CHANNEL processed by the client thread.
783 */
784int cmd_disable_channel(struct ltt_session *session, int domain,
785 char *channel_name)
786{
787 int ret;
788 struct ltt_ust_session *usess;
789
790 usess = session->ust_session;
791
2223c96f
DG
792 rcu_read_lock();
793
2f77fc4b
DG
794 switch (domain) {
795 case LTTNG_DOMAIN_KERNEL:
796 {
797 ret = channel_kernel_disable(session->kernel_session,
798 channel_name);
f73fabfd 799 if (ret != LTTNG_OK) {
2f77fc4b
DG
800 goto error;
801 }
802
803 kernel_wait_quiescent(kernel_tracer_fd);
804 break;
805 }
806 case LTTNG_DOMAIN_UST:
807 {
808 struct ltt_ust_channel *uchan;
809 struct lttng_ht *chan_ht;
810
811 chan_ht = usess->domain_global.channels;
812
813 uchan = trace_ust_find_channel_by_name(chan_ht, channel_name);
814 if (uchan == NULL) {
f73fabfd 815 ret = LTTNG_ERR_UST_CHAN_NOT_FOUND;
2f77fc4b
DG
816 goto error;
817 }
818
7972aab2 819 ret = channel_ust_disable(usess, uchan);
f73fabfd 820 if (ret != LTTNG_OK) {
2f77fc4b
DG
821 goto error;
822 }
823 break;
824 }
825#if 0
826 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
827 case LTTNG_DOMAIN_UST_EXEC_NAME:
828 case LTTNG_DOMAIN_UST_PID:
829#endif
830 default:
f73fabfd 831 ret = LTTNG_ERR_UNKNOWN_DOMAIN;
2f77fc4b
DG
832 goto error;
833 }
834
f73fabfd 835 ret = LTTNG_OK;
2f77fc4b
DG
836
837error:
2223c96f 838 rcu_read_unlock();
2f77fc4b
DG
839 return ret;
840}
841
842/*
843 * Command LTTNG_ENABLE_CHANNEL processed by the client thread.
844 *
845 * The wpipe arguments is used as a notifier for the kernel thread.
846 */
847int cmd_enable_channel(struct ltt_session *session,
7972aab2 848 struct lttng_domain *domain, struct lttng_channel *attr, int wpipe)
2f77fc4b
DG
849{
850 int ret;
851 struct ltt_ust_session *usess = session->ust_session;
852 struct lttng_ht *chan_ht;
853
854 assert(session);
855 assert(attr);
7972aab2 856 assert(domain);
2f77fc4b
DG
857
858 DBG("Enabling channel %s for session %s", attr->name, session->name);
859
03b4fdcf
DG
860 rcu_read_lock();
861
ecc48a90
JD
862 /*
863 * Don't try to enable a channel if the session has been started at
864 * some point in time before. The tracer does not allow it.
865 */
866 if (session->started) {
867 ret = LTTNG_ERR_TRACE_ALREADY_STARTED;
868 goto error;
869 }
870
871 /*
872 * If the session is a live session, remove the switch timer, the
873 * live timer does the same thing but sends also synchronisation
874 * beacons for inactive streams.
875 */
876 if (session->live_timer > 0) {
877 attr->attr.live_timer_interval = session->live_timer;
878 attr->attr.switch_timer_interval = 0;
879 }
880
7972aab2 881 switch (domain->type) {
2f77fc4b
DG
882 case LTTNG_DOMAIN_KERNEL:
883 {
884 struct ltt_kernel_channel *kchan;
885
2f77fc4b
DG
886 kchan = trace_kernel_get_channel_by_name(attr->name,
887 session->kernel_session);
888 if (kchan == NULL) {
4d2a627b
MD
889 /*
890 * Don't try to create a channel if the session
891 * has been started at some point in time
892 * before. The tracer does not allow it.
893 */
894 if (session->started) {
895 ret = LTTNG_ERR_TRACE_ALREADY_STARTED;
896 goto error;
897 }
2f77fc4b 898 ret = channel_kernel_create(session->kernel_session, attr, wpipe);
85076754
MD
899 if (attr->name[0] != '\0') {
900 session->kernel_session->has_non_default_channel = 1;
901 }
2f77fc4b
DG
902 } else {
903 ret = channel_kernel_enable(session->kernel_session, kchan);
904 }
905
f73fabfd 906 if (ret != LTTNG_OK) {
2f77fc4b
DG
907 goto error;
908 }
909
784303b0 910 kernel_wait_quiescent(kernel_tracer_fd);
2f77fc4b
DG
911 break;
912 }
913 case LTTNG_DOMAIN_UST:
914 {
915 struct ltt_ust_channel *uchan;
916
917 chan_ht = usess->domain_global.channels;
918
919 uchan = trace_ust_find_channel_by_name(chan_ht, attr->name);
920 if (uchan == NULL) {
4d2a627b
MD
921 /*
922 * Don't try to create a channel if the session
923 * has been started at some point in time
924 * before. The tracer does not allow it.
925 */
926 if (session->started) {
927 ret = LTTNG_ERR_TRACE_ALREADY_STARTED;
928 goto error;
929 }
7972aab2 930 ret = channel_ust_create(usess, attr, domain->buf_type);
85076754
MD
931 if (attr->name[0] != '\0') {
932 usess->has_non_default_channel = 1;
933 }
2f77fc4b 934 } else {
7972aab2 935 ret = channel_ust_enable(usess, uchan);
2f77fc4b
DG
936 }
937 break;
938 }
2f77fc4b 939 default:
f73fabfd 940 ret = LTTNG_ERR_UNKNOWN_DOMAIN;
2f77fc4b
DG
941 goto error;
942 }
943
944error:
2223c96f 945 rcu_read_unlock();
2f77fc4b
DG
946 return ret;
947}
948
949
950/*
951 * Command LTTNG_DISABLE_EVENT processed by the client thread.
952 */
953int cmd_disable_event(struct ltt_session *session, int domain,
954 char *channel_name, char *event_name)
955{
956 int ret;
957
2223c96f
DG
958 rcu_read_lock();
959
2f77fc4b
DG
960 switch (domain) {
961 case LTTNG_DOMAIN_KERNEL:
962 {
963 struct ltt_kernel_channel *kchan;
964 struct ltt_kernel_session *ksess;
965
966 ksess = session->kernel_session;
967
85076754
MD
968 /*
969 * If a non-default channel has been created in the
970 * session, explicitely require that -c chan_name needs
971 * to be provided.
972 */
973 if (ksess->has_non_default_channel && channel_name[0] == '\0') {
974 ret = LTTNG_ERR_NEED_CHANNEL_NAME;
975 goto error;
976 }
977
2f77fc4b
DG
978 kchan = trace_kernel_get_channel_by_name(channel_name, ksess);
979 if (kchan == NULL) {
f73fabfd 980 ret = LTTNG_ERR_KERN_CHAN_NOT_FOUND;
2f77fc4b
DG
981 goto error;
982 }
983
d3a56674 984 ret = event_kernel_disable_tracepoint(kchan, event_name);
f73fabfd 985 if (ret != LTTNG_OK) {
2f77fc4b
DG
986 goto error;
987 }
988
989 kernel_wait_quiescent(kernel_tracer_fd);
990 break;
991 }
992 case LTTNG_DOMAIN_UST:
993 {
994 struct ltt_ust_channel *uchan;
995 struct ltt_ust_session *usess;
996
997 usess = session->ust_session;
998
85076754
MD
999 /*
1000 * If a non-default channel has been created in the
1001 * session, explicitely require that -c chan_name needs
1002 * to be provided.
1003 */
1004 if (usess->has_non_default_channel && channel_name[0] == '\0') {
1005 ret = LTTNG_ERR_NEED_CHANNEL_NAME;
1006 goto error;
1007 }
1008
2f77fc4b
DG
1009 uchan = trace_ust_find_channel_by_name(usess->domain_global.channels,
1010 channel_name);
1011 if (uchan == NULL) {
f73fabfd 1012 ret = LTTNG_ERR_UST_CHAN_NOT_FOUND;
2f77fc4b
DG
1013 goto error;
1014 }
1015
7972aab2 1016 ret = event_ust_disable_tracepoint(usess, uchan, event_name);
f73fabfd 1017 if (ret != LTTNG_OK) {
2f77fc4b
DG
1018 goto error;
1019 }
1020
1021 DBG3("Disable UST event %s in channel %s completed", event_name,
1022 channel_name);
1023 break;
1024 }
f20baf8e
DG
1025 case LTTNG_DOMAIN_JUL:
1026 {
1027 struct ltt_ust_session *usess = session->ust_session;
1028
1029 assert(usess);
1030
1031 ret = event_jul_disable(usess, event_name);
1032 if (ret != LTTNG_OK) {
1033 goto error;
1034 }
1035
1036 break;
1037 }
2f77fc4b
DG
1038#if 0
1039 case LTTNG_DOMAIN_UST_EXEC_NAME:
1040 case LTTNG_DOMAIN_UST_PID:
1041 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
1042#endif
1043 default:
f73fabfd 1044 ret = LTTNG_ERR_UND;
2f77fc4b
DG
1045 goto error;
1046 }
1047
f73fabfd 1048 ret = LTTNG_OK;
2f77fc4b
DG
1049
1050error:
2223c96f 1051 rcu_read_unlock();
2f77fc4b
DG
1052 return ret;
1053}
1054
1055/*
1056 * Command LTTNG_DISABLE_ALL_EVENT processed by the client thread.
1057 */
1058int cmd_disable_event_all(struct ltt_session *session, int domain,
1059 char *channel_name)
1060{
1061 int ret;
1062
2223c96f
DG
1063 rcu_read_lock();
1064
2f77fc4b
DG
1065 switch (domain) {
1066 case LTTNG_DOMAIN_KERNEL:
1067 {
1068 struct ltt_kernel_session *ksess;
1069 struct ltt_kernel_channel *kchan;
1070
1071 ksess = session->kernel_session;
1072
85076754
MD
1073 /*
1074 * If a non-default channel has been created in the
1075 * session, explicitely require that -c chan_name needs
1076 * to be provided.
1077 */
1078 if (ksess->has_non_default_channel && channel_name[0] == '\0') {
1079 ret = LTTNG_ERR_NEED_CHANNEL_NAME;
1080 goto error;
1081 }
1082
2f77fc4b
DG
1083 kchan = trace_kernel_get_channel_by_name(channel_name, ksess);
1084 if (kchan == NULL) {
f73fabfd 1085 ret = LTTNG_ERR_KERN_CHAN_NOT_FOUND;
2f77fc4b
DG
1086 goto error;
1087 }
1088
d3a56674 1089 ret = event_kernel_disable_all(kchan);
f73fabfd 1090 if (ret != LTTNG_OK) {
2f77fc4b
DG
1091 goto error;
1092 }
1093
1094 kernel_wait_quiescent(kernel_tracer_fd);
1095 break;
1096 }
1097 case LTTNG_DOMAIN_UST:
1098 {
1099 struct ltt_ust_session *usess;
1100 struct ltt_ust_channel *uchan;
1101
1102 usess = session->ust_session;
1103
85076754
MD
1104 /*
1105 * If a non-default channel has been created in the
1106 * session, explicitely require that -c chan_name needs
1107 * to be provided.
1108 */
1109 if (usess->has_non_default_channel && channel_name[0] == '\0') {
1110 ret = LTTNG_ERR_NEED_CHANNEL_NAME;
1111 goto error;
1112 }
1113
2f77fc4b
DG
1114 uchan = trace_ust_find_channel_by_name(usess->domain_global.channels,
1115 channel_name);
1116 if (uchan == NULL) {
f73fabfd 1117 ret = LTTNG_ERR_UST_CHAN_NOT_FOUND;
2f77fc4b
DG
1118 goto error;
1119 }
1120
7972aab2 1121 ret = event_ust_disable_all_tracepoints(usess, uchan);
2f77fc4b
DG
1122 if (ret != 0) {
1123 goto error;
1124 }
1125
1126 DBG3("Disable all UST events in channel %s completed", channel_name);
1127
f20baf8e
DG
1128 break;
1129 }
1130 case LTTNG_DOMAIN_JUL:
1131 {
1132 struct ltt_ust_session *usess = session->ust_session;
1133
1134 assert(usess);
1135
1136 ret = event_jul_disable_all(usess);
1137 if (ret != LTTNG_OK) {
1138 goto error;
1139 }
1140
2f77fc4b
DG
1141 break;
1142 }
1143#if 0
1144 case LTTNG_DOMAIN_UST_EXEC_NAME:
1145 case LTTNG_DOMAIN_UST_PID:
1146 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
1147#endif
1148 default:
f73fabfd 1149 ret = LTTNG_ERR_UND;
2f77fc4b
DG
1150 goto error;
1151 }
1152
f73fabfd 1153 ret = LTTNG_OK;
2f77fc4b
DG
1154
1155error:
2223c96f 1156 rcu_read_unlock();
2f77fc4b
DG
1157 return ret;
1158}
1159
1160/*
1161 * Command LTTNG_ADD_CONTEXT processed by the client thread.
1162 */
1163int cmd_add_context(struct ltt_session *session, int domain,
601d5acf 1164 char *channel_name, struct lttng_event_context *ctx, int kwpipe)
2f77fc4b 1165{
d5979e4a 1166 int ret, chan_kern_created = 0, chan_ust_created = 0;
2f77fc4b
DG
1167
1168 switch (domain) {
1169 case LTTNG_DOMAIN_KERNEL:
979e618e
DG
1170 assert(session->kernel_session);
1171
1172 if (session->kernel_session->channel_count == 0) {
1173 /* Create default channel */
1174 ret = channel_kernel_create(session->kernel_session, NULL, kwpipe);
1175 if (ret != LTTNG_OK) {
1176 goto error;
1177 }
d5979e4a 1178 chan_kern_created = 1;
979e618e 1179 }
2f77fc4b 1180 /* Add kernel context to kernel tracer */
601d5acf 1181 ret = context_kernel_add(session->kernel_session, ctx, channel_name);
f73fabfd 1182 if (ret != LTTNG_OK) {
2f77fc4b
DG
1183 goto error;
1184 }
1185 break;
1186 case LTTNG_DOMAIN_UST:
1187 {
1188 struct ltt_ust_session *usess = session->ust_session;
85076754
MD
1189 unsigned int chan_count;
1190
2f77fc4b
DG
1191 assert(usess);
1192
85076754 1193 chan_count = lttng_ht_get_count(usess->domain_global.channels);
979e618e
DG
1194 if (chan_count == 0) {
1195 struct lttng_channel *attr;
1196 /* Create default channel */
0a9c6494 1197 attr = channel_new_default_attr(domain, usess->buffer_type);
979e618e
DG
1198 if (attr == NULL) {
1199 ret = LTTNG_ERR_FATAL;
1200 goto error;
1201 }
1202
7972aab2 1203 ret = channel_ust_create(usess, attr, usess->buffer_type);
979e618e
DG
1204 if (ret != LTTNG_OK) {
1205 free(attr);
1206 goto error;
1207 }
1208 free(attr);
d5979e4a 1209 chan_ust_created = 1;
979e618e
DG
1210 }
1211
601d5acf 1212 ret = context_ust_add(usess, domain, ctx, channel_name);
f73fabfd 1213 if (ret != LTTNG_OK) {
2f77fc4b
DG
1214 goto error;
1215 }
1216 break;
1217 }
1218#if 0
1219 case LTTNG_DOMAIN_UST_EXEC_NAME:
1220 case LTTNG_DOMAIN_UST_PID:
1221 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
1222#endif
1223 default:
f73fabfd 1224 ret = LTTNG_ERR_UND;
2f77fc4b
DG
1225 goto error;
1226 }
1227
d5979e4a 1228 return LTTNG_OK;
2f77fc4b
DG
1229
1230error:
d5979e4a
DG
1231 if (chan_kern_created) {
1232 struct ltt_kernel_channel *kchan =
1233 trace_kernel_get_channel_by_name(DEFAULT_CHANNEL_NAME,
1234 session->kernel_session);
1235 /* Created previously, this should NOT fail. */
1236 assert(kchan);
1237 kernel_destroy_channel(kchan);
1238 }
1239
1240 if (chan_ust_created) {
1241 struct ltt_ust_channel *uchan =
1242 trace_ust_find_channel_by_name(
1243 session->ust_session->domain_global.channels,
1244 DEFAULT_CHANNEL_NAME);
1245 /* Created previously, this should NOT fail. */
1246 assert(uchan);
1247 /* Remove from the channel list of the session. */
1248 trace_ust_delete_channel(session->ust_session->domain_global.channels,
1249 uchan);
1250 trace_ust_destroy_channel(uchan);
1251 }
2f77fc4b
DG
1252 return ret;
1253}
1254
2f77fc4b
DG
1255/*
1256 * Command LTTNG_ENABLE_EVENT processed by the client thread.
1257 */
7972aab2 1258int cmd_enable_event(struct ltt_session *session, struct lttng_domain *domain,
025faf73
DG
1259 char *channel_name, struct lttng_event *event,
1260 struct lttng_filter_bytecode *filter, int wpipe)
2f77fc4b 1261{
e5f5db7f 1262 int ret, channel_created = 0;
2f77fc4b
DG
1263 struct lttng_channel *attr;
1264
1265 assert(session);
1266 assert(event);
1267 assert(channel_name);
1268
2223c96f
DG
1269 rcu_read_lock();
1270
7972aab2 1271 switch (domain->type) {
2f77fc4b
DG
1272 case LTTNG_DOMAIN_KERNEL:
1273 {
1274 struct ltt_kernel_channel *kchan;
1275
85076754
MD
1276 /*
1277 * If a non-default channel has been created in the
1278 * session, explicitely require that -c chan_name needs
1279 * to be provided.
1280 */
1281 if (session->kernel_session->has_non_default_channel
1282 && channel_name[0] == '\0') {
1283 ret = LTTNG_ERR_NEED_CHANNEL_NAME;
1284 goto error;
1285 }
1286
2f77fc4b
DG
1287 kchan = trace_kernel_get_channel_by_name(channel_name,
1288 session->kernel_session);
1289 if (kchan == NULL) {
0a9c6494
DG
1290 attr = channel_new_default_attr(LTTNG_DOMAIN_KERNEL,
1291 LTTNG_BUFFER_GLOBAL);
2f77fc4b 1292 if (attr == NULL) {
f73fabfd 1293 ret = LTTNG_ERR_FATAL;
2f77fc4b
DG
1294 goto error;
1295 }
1296 strncpy(attr->name, channel_name, sizeof(attr->name));
1297
1298 ret = cmd_enable_channel(session, domain, attr, wpipe);
f73fabfd 1299 if (ret != LTTNG_OK) {
2f77fc4b
DG
1300 free(attr);
1301 goto error;
1302 }
1303 free(attr);
e5f5db7f
DG
1304
1305 channel_created = 1;
2f77fc4b
DG
1306 }
1307
1308 /* Get the newly created kernel channel pointer */
1309 kchan = trace_kernel_get_channel_by_name(channel_name,
1310 session->kernel_session);
1311 if (kchan == NULL) {
1312 /* This sould not happen... */
f73fabfd 1313 ret = LTTNG_ERR_FATAL;
2f77fc4b
DG
1314 goto error;
1315 }
1316
d3a56674 1317 ret = event_kernel_enable_tracepoint(kchan, event);
f73fabfd 1318 if (ret != LTTNG_OK) {
e5f5db7f
DG
1319 if (channel_created) {
1320 /* Let's not leak a useless channel. */
1321 kernel_destroy_channel(kchan);
1322 }
2f77fc4b
DG
1323 goto error;
1324 }
1325
1326 kernel_wait_quiescent(kernel_tracer_fd);
1327 break;
1328 }
1329 case LTTNG_DOMAIN_UST:
1330 {
1331 struct ltt_ust_channel *uchan;
1332 struct ltt_ust_session *usess = session->ust_session;
1333
1334 assert(usess);
1335
85076754
MD
1336 /*
1337 * If a non-default channel has been created in the
1338 * session, explicitely require that -c chan_name needs
1339 * to be provided.
1340 */
1341 if (usess->has_non_default_channel && channel_name[0] == '\0') {
1342 ret = LTTNG_ERR_NEED_CHANNEL_NAME;
1343 goto error;
1344 }
1345
2f77fc4b
DG
1346 /* Get channel from global UST domain */
1347 uchan = trace_ust_find_channel_by_name(usess->domain_global.channels,
1348 channel_name);
1349 if (uchan == NULL) {
1350 /* Create default channel */
0a9c6494
DG
1351 attr = channel_new_default_attr(LTTNG_DOMAIN_UST,
1352 usess->buffer_type);
2f77fc4b 1353 if (attr == NULL) {
f73fabfd 1354 ret = LTTNG_ERR_FATAL;
2f77fc4b
DG
1355 goto error;
1356 }
1357 strncpy(attr->name, channel_name, sizeof(attr->name));
1358
1359 ret = cmd_enable_channel(session, domain, attr, wpipe);
f73fabfd 1360 if (ret != LTTNG_OK) {
2f77fc4b
DG
1361 free(attr);
1362 goto error;
1363 }
1364 free(attr);
1365
1366 /* Get the newly created channel reference back */
1367 uchan = trace_ust_find_channel_by_name(
1368 usess->domain_global.channels, channel_name);
1369 assert(uchan);
1370 }
1371
1372 /* At this point, the session and channel exist on the tracer */
7972aab2 1373 ret = event_ust_enable_tracepoint(usess, uchan, event, filter);
f73fabfd 1374 if (ret != LTTNG_OK) {
2f77fc4b
DG
1375 goto error;
1376 }
1377 break;
1378 }
f20baf8e
DG
1379 case LTTNG_DOMAIN_JUL:
1380 {
1381 struct lttng_event uevent;
1382 struct lttng_domain tmp_dom;
1383 struct ltt_ust_session *usess = session->ust_session;
1384
1385 assert(usess);
1386
1387 /* Create the default JUL tracepoint. */
1388 uevent.type = LTTNG_EVENT_TRACEPOINT;
1389 uevent.loglevel_type = LTTNG_EVENT_LOGLEVEL_ALL;
1390 strncpy(uevent.name, DEFAULT_JUL_EVENT_NAME, sizeof(uevent.name));
1391 uevent.name[sizeof(uevent.name) - 1] = '\0';
1392
1393 /*
1394 * The domain type is changed because we are about to enable the
1395 * default channel and event for the JUL domain that are hardcoded.
1396 * This happens in the UST domain.
1397 */
1398 memcpy(&tmp_dom, domain, sizeof(tmp_dom));
1399 tmp_dom.type = LTTNG_DOMAIN_UST;
1400
1401 ret = cmd_enable_event(session, &tmp_dom, DEFAULT_JUL_CHANNEL_NAME,
1402 &uevent, NULL, wpipe);
1403 if (ret != LTTNG_OK && ret != LTTNG_ERR_UST_EVENT_ENABLED) {
1404 goto error;
1405 }
1406
1407 /* The wild card * means that everything should be enabled. */
1408 if (strncmp(event->name, "*", 1) == 0 && strlen(event->name) == 1) {
1409 ret = event_jul_enable_all(usess);
1410 } else {
1411 ret = event_jul_enable(usess, event);
1412 }
1413 if (ret != LTTNG_OK) {
1414 goto error;
1415 }
1416
1417 break;
1418 }
2f77fc4b
DG
1419#if 0
1420 case LTTNG_DOMAIN_UST_EXEC_NAME:
1421 case LTTNG_DOMAIN_UST_PID:
1422 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
1423#endif
1424 default:
f73fabfd 1425 ret = LTTNG_ERR_UND;
2f77fc4b
DG
1426 goto error;
1427 }
1428
f73fabfd 1429 ret = LTTNG_OK;
2f77fc4b
DG
1430
1431error:
2223c96f 1432 rcu_read_unlock();
2f77fc4b
DG
1433 return ret;
1434}
1435
1436/*
1437 * Command LTTNG_ENABLE_ALL_EVENT processed by the client thread.
1438 */
7972aab2
DG
1439int cmd_enable_event_all(struct ltt_session *session,
1440 struct lttng_domain *domain, char *channel_name, int event_type,
025faf73 1441 struct lttng_filter_bytecode *filter, int wpipe)
2f77fc4b
DG
1442{
1443 int ret;
1444 struct lttng_channel *attr;
1445
1446 assert(session);
1447 assert(channel_name);
1448
2223c96f
DG
1449 rcu_read_lock();
1450
7972aab2 1451 switch (domain->type) {
2f77fc4b
DG
1452 case LTTNG_DOMAIN_KERNEL:
1453 {
1454 struct ltt_kernel_channel *kchan;
1455
1456 assert(session->kernel_session);
1457
85076754
MD
1458 /*
1459 * If a non-default channel has been created in the
1460 * session, explicitely require that -c chan_name needs
1461 * to be provided.
1462 */
1463 if (session->kernel_session->has_non_default_channel
1464 && channel_name[0] == '\0') {
1465 ret = LTTNG_ERR_NEED_CHANNEL_NAME;
1466 goto error;
1467 }
1468
2f77fc4b
DG
1469 kchan = trace_kernel_get_channel_by_name(channel_name,
1470 session->kernel_session);
1471 if (kchan == NULL) {
1472 /* Create default channel */
0a9c6494
DG
1473 attr = channel_new_default_attr(LTTNG_DOMAIN_KERNEL,
1474 LTTNG_BUFFER_GLOBAL);
2f77fc4b 1475 if (attr == NULL) {
f73fabfd 1476 ret = LTTNG_ERR_FATAL;
2f77fc4b
DG
1477 goto error;
1478 }
1479 strncpy(attr->name, channel_name, sizeof(attr->name));
1480
1481 ret = cmd_enable_channel(session, domain, attr, wpipe);
f73fabfd 1482 if (ret != LTTNG_OK) {
2f77fc4b
DG
1483 free(attr);
1484 goto error;
1485 }
1486 free(attr);
1487
1488 /* Get the newly created kernel channel pointer */
1489 kchan = trace_kernel_get_channel_by_name(channel_name,
1490 session->kernel_session);
1491 assert(kchan);
1492 }
1493
1494 switch (event_type) {
1495 case LTTNG_EVENT_SYSCALL:
d3a56674 1496 ret = event_kernel_enable_all_syscalls(kchan, kernel_tracer_fd);
2f77fc4b
DG
1497 break;
1498 case LTTNG_EVENT_TRACEPOINT:
1499 /*
1500 * This call enables all LTTNG_KERNEL_TRACEPOINTS and
1501 * events already registered to the channel.
1502 */
d3a56674 1503 ret = event_kernel_enable_all_tracepoints(kchan, kernel_tracer_fd);
2f77fc4b
DG
1504 break;
1505 case LTTNG_EVENT_ALL:
1506 /* Enable syscalls and tracepoints */
d3a56674 1507 ret = event_kernel_enable_all(kchan, kernel_tracer_fd);
2f77fc4b
DG
1508 break;
1509 default:
f73fabfd 1510 ret = LTTNG_ERR_KERN_ENABLE_FAIL;
2f77fc4b
DG
1511 goto error;
1512 }
1513
1514 /* Manage return value */
f73fabfd 1515 if (ret != LTTNG_OK) {
e5f5db7f
DG
1516 /*
1517 * On error, cmd_enable_channel call will take care of destroying
1518 * the created channel if it was needed.
1519 */
2f77fc4b
DG
1520 goto error;
1521 }
1522
1523 kernel_wait_quiescent(kernel_tracer_fd);
1524 break;
1525 }
1526 case LTTNG_DOMAIN_UST:
1527 {
1528 struct ltt_ust_channel *uchan;
1529 struct ltt_ust_session *usess = session->ust_session;
1530
1531 assert(usess);
1532
85076754
MD
1533 /*
1534 * If a non-default channel has been created in the
1535 * session, explicitely require that -c chan_name needs
1536 * to be provided.
1537 */
1538 if (usess->has_non_default_channel && channel_name[0] == '\0') {
1539 ret = LTTNG_ERR_NEED_CHANNEL_NAME;
1540 goto error;
1541 }
1542
2f77fc4b
DG
1543 /* Get channel from global UST domain */
1544 uchan = trace_ust_find_channel_by_name(usess->domain_global.channels,
1545 channel_name);
1546 if (uchan == NULL) {
1547 /* Create default channel */
0a9c6494
DG
1548 attr = channel_new_default_attr(LTTNG_DOMAIN_UST,
1549 usess->buffer_type);
2f77fc4b 1550 if (attr == NULL) {
f73fabfd 1551 ret = LTTNG_ERR_FATAL;
2f77fc4b
DG
1552 goto error;
1553 }
1554 strncpy(attr->name, channel_name, sizeof(attr->name));
1555
1556 ret = cmd_enable_channel(session, domain, attr, wpipe);
f73fabfd 1557 if (ret != LTTNG_OK) {
2f77fc4b
DG
1558 free(attr);
1559 goto error;
1560 }
1561 free(attr);
1562
1563 /* Get the newly created channel reference back */
1564 uchan = trace_ust_find_channel_by_name(
1565 usess->domain_global.channels, channel_name);
1566 assert(uchan);
1567 }
1568
1569 /* At this point, the session and channel exist on the tracer */
1570
1571 switch (event_type) {
1572 case LTTNG_EVENT_ALL:
1573 case LTTNG_EVENT_TRACEPOINT:
7972aab2 1574 ret = event_ust_enable_all_tracepoints(usess, uchan, filter);
f73fabfd 1575 if (ret != LTTNG_OK) {
2f77fc4b
DG
1576 goto error;
1577 }
1578 break;
1579 default:
f73fabfd 1580 ret = LTTNG_ERR_UST_ENABLE_FAIL;
2f77fc4b
DG
1581 goto error;
1582 }
1583
1584 /* Manage return value */
f73fabfd 1585 if (ret != LTTNG_OK) {
2f77fc4b
DG
1586 goto error;
1587 }
1588
f20baf8e
DG
1589 break;
1590 }
1591 case LTTNG_DOMAIN_JUL:
1592 {
1593 struct lttng_event uevent;
1594 struct lttng_domain tmp_dom;
1595 struct ltt_ust_session *usess = session->ust_session;
1596
1597 assert(usess);
1598
1599 /* Create the default JUL tracepoint. */
1600 uevent.type = LTTNG_EVENT_TRACEPOINT;
1601 uevent.loglevel_type = LTTNG_EVENT_LOGLEVEL_ALL;
1602 strncpy(uevent.name, DEFAULT_JUL_EVENT_NAME, sizeof(uevent.name));
1603 uevent.name[sizeof(uevent.name) - 1] = '\0';
1604
1605 /*
1606 * The domain type is changed because we are about to enable the
1607 * default channel and event for the JUL domain that are hardcoded.
1608 * This happens in the UST domain.
1609 */
1610 memcpy(&tmp_dom, domain, sizeof(tmp_dom));
1611 tmp_dom.type = LTTNG_DOMAIN_UST;
1612
1613 ret = cmd_enable_event(session, &tmp_dom, DEFAULT_JUL_CHANNEL_NAME,
1614 &uevent, NULL, wpipe);
1615 if (ret != LTTNG_OK && ret != LTTNG_ERR_UST_EVENT_ENABLED) {
1616 goto error;
1617 }
1618
1619 ret = event_jul_enable_all(usess);
1620 if (ret != LTTNG_OK) {
1621 goto error;
1622 }
1623
2f77fc4b
DG
1624 break;
1625 }
1626#if 0
1627 case LTTNG_DOMAIN_UST_EXEC_NAME:
1628 case LTTNG_DOMAIN_UST_PID:
1629 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
1630#endif
1631 default:
f73fabfd 1632 ret = LTTNG_ERR_UND;
2f77fc4b
DG
1633 goto error;
1634 }
1635
f73fabfd 1636 ret = LTTNG_OK;
2f77fc4b
DG
1637
1638error:
2223c96f 1639 rcu_read_unlock();
2f77fc4b
DG
1640 return ret;
1641}
1642
1643
1644/*
1645 * Command LTTNG_LIST_TRACEPOINTS processed by the client thread.
1646 */
1647ssize_t cmd_list_tracepoints(int domain, struct lttng_event **events)
1648{
1649 int ret;
1650 ssize_t nb_events = 0;
1651
1652 switch (domain) {
1653 case LTTNG_DOMAIN_KERNEL:
1654 nb_events = kernel_list_events(kernel_tracer_fd, events);
1655 if (nb_events < 0) {
f73fabfd 1656 ret = LTTNG_ERR_KERN_LIST_FAIL;
2f77fc4b
DG
1657 goto error;
1658 }
1659 break;
1660 case LTTNG_DOMAIN_UST:
1661 nb_events = ust_app_list_events(events);
1662 if (nb_events < 0) {
f73fabfd 1663 ret = LTTNG_ERR_UST_LIST_FAIL;
2f77fc4b
DG
1664 goto error;
1665 }
1666 break;
1667 default:
f73fabfd 1668 ret = LTTNG_ERR_UND;
2f77fc4b
DG
1669 goto error;
1670 }
1671
1672 return nb_events;
1673
1674error:
1675 /* Return negative value to differentiate return code */
1676 return -ret;
1677}
1678
1679/*
1680 * Command LTTNG_LIST_TRACEPOINT_FIELDS processed by the client thread.
1681 */
1682ssize_t cmd_list_tracepoint_fields(int domain,
1683 struct lttng_event_field **fields)
1684{
1685 int ret;
1686 ssize_t nb_fields = 0;
1687
1688 switch (domain) {
1689 case LTTNG_DOMAIN_UST:
1690 nb_fields = ust_app_list_event_fields(fields);
1691 if (nb_fields < 0) {
f73fabfd 1692 ret = LTTNG_ERR_UST_LIST_FAIL;
2f77fc4b
DG
1693 goto error;
1694 }
1695 break;
1696 case LTTNG_DOMAIN_KERNEL:
1697 default: /* fall-through */
f73fabfd 1698 ret = LTTNG_ERR_UND;
2f77fc4b
DG
1699 goto error;
1700 }
1701
1702 return nb_fields;
1703
1704error:
1705 /* Return negative value to differentiate return code */
1706 return -ret;
1707}
1708
1709/*
1710 * Command LTTNG_START_TRACE processed by the client thread.
1711 */
1712int cmd_start_trace(struct ltt_session *session)
1713{
1714 int ret;
1715 struct ltt_kernel_session *ksession;
1716 struct ltt_ust_session *usess;
2f77fc4b
DG
1717
1718 assert(session);
1719
1720 /* Ease our life a bit ;) */
1721 ksession = session->kernel_session;
1722 usess = session->ust_session;
1723
1724 if (session->enabled) {
1725 /* Already started. */
f73fabfd 1726 ret = LTTNG_ERR_TRACE_ALREADY_STARTED;
2f77fc4b
DG
1727 goto error;
1728 }
1729
1730 session->enabled = 1;
1731
2f77fc4b
DG
1732 /* Kernel tracing */
1733 if (ksession != NULL) {
9b6c7ec5
DG
1734 ret = start_kernel_session(ksession, kernel_tracer_fd);
1735 if (ret != LTTNG_OK) {
2f77fc4b
DG
1736 goto error;
1737 }
2f77fc4b
DG
1738 }
1739
1740 /* Flag session that trace should start automatically */
1741 if (usess) {
1742 usess->start_trace = 1;
1743
1744 ret = ust_app_start_trace_all(usess);
1745 if (ret < 0) {
f73fabfd 1746 ret = LTTNG_ERR_UST_START_FAIL;
2f77fc4b
DG
1747 goto error;
1748 }
1749 }
1750
9b6c7ec5
DG
1751 session->started = 1;
1752
f73fabfd 1753 ret = LTTNG_OK;
2f77fc4b
DG
1754
1755error:
1756 return ret;
1757}
1758
1759/*
1760 * Command LTTNG_STOP_TRACE processed by the client thread.
1761 */
1762int cmd_stop_trace(struct ltt_session *session)
1763{
1764 int ret;
1765 struct ltt_kernel_channel *kchan;
1766 struct ltt_kernel_session *ksession;
1767 struct ltt_ust_session *usess;
1768
1769 assert(session);
1770
1771 /* Short cut */
1772 ksession = session->kernel_session;
1773 usess = session->ust_session;
1774
1775 if (!session->enabled) {
f73fabfd 1776 ret = LTTNG_ERR_TRACE_ALREADY_STOPPED;
2f77fc4b
DG
1777 goto error;
1778 }
1779
1780 session->enabled = 0;
1781
1782 /* Kernel tracer */
d39829a1 1783 if (ksession && ksession->started) {
2f77fc4b
DG
1784 DBG("Stop kernel tracing");
1785
1786 /* Flush metadata if exist */
1787 if (ksession->metadata_stream_fd >= 0) {
1788 ret = kernel_metadata_flush_buffer(ksession->metadata_stream_fd);
1789 if (ret < 0) {
1790 ERR("Kernel metadata flush failed");
1791 }
1792 }
1793
1794 /* Flush all buffers before stopping */
1795 cds_list_for_each_entry(kchan, &ksession->channel_list.head, list) {
1796 ret = kernel_flush_buffer(kchan);
1797 if (ret < 0) {
1798 ERR("Kernel flush buffer error");
1799 }
1800 }
1801
1802 ret = kernel_stop_session(ksession);
1803 if (ret < 0) {
f73fabfd 1804 ret = LTTNG_ERR_KERN_STOP_FAIL;
2f77fc4b
DG
1805 goto error;
1806 }
1807
1808 kernel_wait_quiescent(kernel_tracer_fd);
9b6c7ec5
DG
1809
1810 ksession->started = 0;
2f77fc4b
DG
1811 }
1812
d39829a1 1813 if (usess && usess->start_trace) {
2f77fc4b
DG
1814 usess->start_trace = 0;
1815
1816 ret = ust_app_stop_trace_all(usess);
1817 if (ret < 0) {
f73fabfd 1818 ret = LTTNG_ERR_UST_STOP_FAIL;
2f77fc4b
DG
1819 goto error;
1820 }
1821 }
1822
f73fabfd 1823 ret = LTTNG_OK;
2f77fc4b
DG
1824
1825error:
1826 return ret;
1827}
1828
1829/*
1830 * Command LTTNG_SET_CONSUMER_URI processed by the client thread.
1831 */
1832int cmd_set_consumer_uri(int domain, struct ltt_session *session,
1833 size_t nb_uri, struct lttng_uri *uris)
1834{
1835 int ret, i;
1836 struct ltt_kernel_session *ksess = session->kernel_session;
1837 struct ltt_ust_session *usess = session->ust_session;
1838 struct consumer_output *consumer = NULL;
1839
1840 assert(session);
1841 assert(uris);
1842 assert(nb_uri > 0);
1843
1844 /* Can't enable consumer after session started. */
1845 if (session->enabled) {
f73fabfd 1846 ret = LTTNG_ERR_TRACE_ALREADY_STARTED;
2f77fc4b
DG
1847 goto error;
1848 }
1849
2f77fc4b
DG
1850 /*
1851 * This case switch makes sure the domain session has a temporary consumer
1852 * so the URL can be set.
1853 */
1854 switch (domain) {
1855 case 0:
1856 /* Code flow error. A session MUST always have a consumer object */
1857 assert(session->consumer);
1858 /*
1859 * The URL will be added to the tracing session consumer instead of a
1860 * specific domain consumer.
1861 */
1862 consumer = session->consumer;
1863 break;
1864 case LTTNG_DOMAIN_KERNEL:
1865 /* Code flow error if we don't have a kernel session here. */
1866 assert(ksess);
785d2d0d
DG
1867 assert(ksess->consumer);
1868 consumer = ksess->consumer;
2f77fc4b
DG
1869 break;
1870 case LTTNG_DOMAIN_UST:
1871 /* Code flow error if we don't have a kernel session here. */
1872 assert(usess);
785d2d0d
DG
1873 assert(usess->consumer);
1874 consumer = usess->consumer;
2f77fc4b
DG
1875 break;
1876 }
1877
1878 for (i = 0; i < nb_uri; i++) {
2f77fc4b 1879 ret = add_uri_to_consumer(consumer, &uris[i], domain, session->name);
a74934ba 1880 if (ret != LTTNG_OK) {
2f77fc4b
DG
1881 goto error;
1882 }
2f77fc4b
DG
1883 }
1884
1885 /* All good! */
f73fabfd 1886 ret = LTTNG_OK;
2f77fc4b
DG
1887
1888error:
1889 return ret;
1890}
1891
1892/*
1893 * Command LTTNG_CREATE_SESSION processed by the client thread.
1894 */
1895int cmd_create_session_uri(char *name, struct lttng_uri *uris,
ecc48a90 1896 size_t nb_uri, lttng_sock_cred *creds, unsigned int live_timer)
2f77fc4b
DG
1897{
1898 int ret;
2f77fc4b
DG
1899 struct ltt_session *session;
1900
1901 assert(name);
2bba9e53 1902 assert(creds);
785d2d0d 1903
2f77fc4b
DG
1904 /*
1905 * Verify if the session already exist
1906 *
1907 * XXX: There is no need for the session lock list here since the caller
1908 * (process_client_msg) is holding it. We might want to change that so a
1909 * single command does not lock the entire session list.
1910 */
1911 session = session_find_by_name(name);
1912 if (session != NULL) {
f73fabfd 1913 ret = LTTNG_ERR_EXIST_SESS;
2f77fc4b
DG
1914 goto find_error;
1915 }
1916
1917 /* Create tracing session in the registry */
dec56f6c 1918 ret = session_create(name, LTTNG_SOCK_GET_UID_CRED(creds),
2f77fc4b 1919 LTTNG_SOCK_GET_GID_CRED(creds));
f73fabfd 1920 if (ret != LTTNG_OK) {
2f77fc4b
DG
1921 goto session_error;
1922 }
1923
1924 /*
1925 * Get the newly created session pointer back
1926 *
1927 * XXX: There is no need for the session lock list here since the caller
1928 * (process_client_msg) is holding it. We might want to change that so a
1929 * single command does not lock the entire session list.
1930 */
1931 session = session_find_by_name(name);
1932 assert(session);
1933
ecc48a90 1934 session->live_timer = live_timer;
2f77fc4b
DG
1935 /* Create default consumer output for the session not yet created. */
1936 session->consumer = consumer_create_output(CONSUMER_DST_LOCAL);
1937 if (session->consumer == NULL) {
f73fabfd 1938 ret = LTTNG_ERR_FATAL;
2f77fc4b
DG
1939 goto consumer_error;
1940 }
1941
2bba9e53
DG
1942 if (uris) {
1943 ret = cmd_set_consumer_uri(0, session, nb_uri, uris);
1944 if (ret != LTTNG_OK) {
1945 goto consumer_error;
1946 }
1947 session->output_traces = 1;
1948 } else {
1949 session->output_traces = 0;
1950 DBG2("Session %s created with no output", session->name);
2f77fc4b
DG
1951 }
1952
1953 session->consumer->enabled = 1;
1954
f73fabfd 1955 return LTTNG_OK;
2f77fc4b
DG
1956
1957consumer_error:
1958 session_destroy(session);
1959session_error:
1960find_error:
1961 return ret;
1962}
1963
27babd3a
DG
1964/*
1965 * Command LTTNG_CREATE_SESSION_SNAPSHOT processed by the client thread.
1966 */
1967int cmd_create_session_snapshot(char *name, struct lttng_uri *uris,
1968 size_t nb_uri, lttng_sock_cred *creds)
1969{
1970 int ret;
1971 struct ltt_session *session;
1972 struct snapshot_output *new_output = NULL;
1973
1974 assert(name);
1975 assert(creds);
1976
1977 /*
1978 * Create session in no output mode with URIs set to NULL. The uris we've
1979 * received are for a default snapshot output if one.
1980 */
ecc48a90 1981 ret = cmd_create_session_uri(name, NULL, 0, creds, -1);
27babd3a
DG
1982 if (ret != LTTNG_OK) {
1983 goto error;
1984 }
1985
1986 /* Get the newly created session pointer back. This should NEVER fail. */
1987 session = session_find_by_name(name);
1988 assert(session);
1989
1990 /* Flag session for snapshot mode. */
1991 session->snapshot_mode = 1;
1992
1993 /* Skip snapshot output creation if no URI is given. */
1994 if (nb_uri == 0) {
1995 goto end;
1996 }
1997
1998 new_output = snapshot_output_alloc();
1999 if (!new_output) {
2000 ret = LTTNG_ERR_NOMEM;
2001 goto error_snapshot_alloc;
2002 }
2003
2004 ret = snapshot_output_init_with_uri(DEFAULT_SNAPSHOT_MAX_SIZE, NULL,
2005 uris, nb_uri, session->consumer, new_output, &session->snapshot);
2006 if (ret < 0) {
2007 if (ret == -ENOMEM) {
2008 ret = LTTNG_ERR_NOMEM;
2009 } else {
2010 ret = LTTNG_ERR_INVALID;
2011 }
2012 goto error_snapshot;
2013 }
2014
2015 rcu_read_lock();
2016 snapshot_add_output(&session->snapshot, new_output);
2017 rcu_read_unlock();
2018
2019end:
2020 return LTTNG_OK;
2021
2022error_snapshot:
2023 snapshot_output_destroy(new_output);
2024error_snapshot_alloc:
2025 session_destroy(session);
2026error:
2027 return ret;
2028}
2029
2f77fc4b
DG
2030/*
2031 * Command LTTNG_DESTROY_SESSION processed by the client thread.
2032 */
2033int cmd_destroy_session(struct ltt_session *session, int wpipe)
2034{
2035 int ret;
2036 struct ltt_ust_session *usess;
2037 struct ltt_kernel_session *ksess;
2038
2039 /* Safety net */
2040 assert(session);
2041
2042 usess = session->ust_session;
2043 ksess = session->kernel_session;
2044
2045 /* Clean kernel session teardown */
2046 kernel_destroy_session(ksess);
2047
2048 /* UST session teardown */
2049 if (usess) {
2050 /* Close any relayd session */
2051 consumer_output_send_destroy_relayd(usess->consumer);
2052
2053 /* Destroy every UST application related to this session. */
2054 ret = ust_app_destroy_trace_all(usess);
2055 if (ret) {
2056 ERR("Error in ust_app_destroy_trace_all");
2057 }
2058
2059 /* Clean up the rest. */
2060 trace_ust_destroy_session(usess);
2061 }
2062
2063 /*
2064 * Must notify the kernel thread here to update it's poll set in order to
2065 * remove the channel(s)' fd just destroyed.
2066 */
2067 ret = notify_thread_pipe(wpipe);
2068 if (ret < 0) {
2069 PERROR("write kernel poll pipe");
2070 }
2071
2072 ret = session_destroy(session);
2073
2074 return ret;
2075}
2076
2077/*
2078 * Command LTTNG_CALIBRATE processed by the client thread.
2079 */
2080int cmd_calibrate(int domain, struct lttng_calibrate *calibrate)
2081{
2082 int ret;
2083
2084 switch (domain) {
2085 case LTTNG_DOMAIN_KERNEL:
2086 {
2087 struct lttng_kernel_calibrate kcalibrate;
2088
2089 kcalibrate.type = calibrate->type;
2090 ret = kernel_calibrate(kernel_tracer_fd, &kcalibrate);
2091 if (ret < 0) {
f73fabfd 2092 ret = LTTNG_ERR_KERN_ENABLE_FAIL;
2f77fc4b
DG
2093 goto error;
2094 }
2095 break;
2096 }
2097 case LTTNG_DOMAIN_UST:
2098 {
2099 struct lttng_ust_calibrate ucalibrate;
2100
2101 ucalibrate.type = calibrate->type;
2102 ret = ust_app_calibrate_glb(&ucalibrate);
2103 if (ret < 0) {
f73fabfd 2104 ret = LTTNG_ERR_UST_CALIBRATE_FAIL;
2f77fc4b
DG
2105 goto error;
2106 }
2107 break;
2108 }
2109 default:
f73fabfd 2110 ret = LTTNG_ERR_UND;
2f77fc4b
DG
2111 goto error;
2112 }
2113
f73fabfd 2114 ret = LTTNG_OK;
2f77fc4b
DG
2115
2116error:
2117 return ret;
2118}
2119
2120/*
2121 * Command LTTNG_REGISTER_CONSUMER processed by the client thread.
2122 */
2123int cmd_register_consumer(struct ltt_session *session, int domain,
2124 const char *sock_path, struct consumer_data *cdata)
2125{
2126 int ret, sock;
dd81b457 2127 struct consumer_socket *socket = NULL;
2f77fc4b
DG
2128
2129 assert(session);
2130 assert(cdata);
2131 assert(sock_path);
2132
2133 switch (domain) {
2134 case LTTNG_DOMAIN_KERNEL:
2135 {
2136 struct ltt_kernel_session *ksess = session->kernel_session;
2137
2138 assert(ksess);
2139
2140 /* Can't register a consumer if there is already one */
2141 if (ksess->consumer_fds_sent != 0) {
f73fabfd 2142 ret = LTTNG_ERR_KERN_CONSUMER_FAIL;
2f77fc4b
DG
2143 goto error;
2144 }
2145
2146 sock = lttcomm_connect_unix_sock(sock_path);
2147 if (sock < 0) {
f73fabfd 2148 ret = LTTNG_ERR_CONNECT_FAIL;
2f77fc4b
DG
2149 goto error;
2150 }
4ce514c4 2151 cdata->cmd_sock = sock;
2f77fc4b 2152
4ce514c4 2153 socket = consumer_allocate_socket(&cdata->cmd_sock);
2f77fc4b 2154 if (socket == NULL) {
f66c074c
DG
2155 ret = close(sock);
2156 if (ret < 0) {
2157 PERROR("close register consumer");
2158 }
4ce514c4 2159 cdata->cmd_sock = -1;
f73fabfd 2160 ret = LTTNG_ERR_FATAL;
2f77fc4b
DG
2161 goto error;
2162 }
2163
2164 socket->lock = zmalloc(sizeof(pthread_mutex_t));
2165 if (socket->lock == NULL) {
2166 PERROR("zmalloc pthread mutex");
f73fabfd 2167 ret = LTTNG_ERR_FATAL;
2f77fc4b
DG
2168 goto error;
2169 }
2170 pthread_mutex_init(socket->lock, NULL);
2171 socket->registered = 1;
2172
2173 rcu_read_lock();
2174 consumer_add_socket(socket, ksess->consumer);
2175 rcu_read_unlock();
2176
2177 pthread_mutex_lock(&cdata->pid_mutex);
2178 cdata->pid = -1;
2179 pthread_mutex_unlock(&cdata->pid_mutex);
2180
2181 break;
2182 }
2183 default:
2184 /* TODO: Userspace tracing */
f73fabfd 2185 ret = LTTNG_ERR_UND;
2f77fc4b
DG
2186 goto error;
2187 }
2188
dd81b457 2189 return LTTNG_OK;
2f77fc4b
DG
2190
2191error:
dd81b457
DG
2192 if (socket) {
2193 consumer_destroy_socket(socket);
2194 }
2f77fc4b
DG
2195 return ret;
2196}
2197
2198/*
2199 * Command LTTNG_LIST_DOMAINS processed by the client thread.
2200 */
2201ssize_t cmd_list_domains(struct ltt_session *session,
2202 struct lttng_domain **domains)
2203{
2204 int ret, index = 0;
2205 ssize_t nb_dom = 0;
2206
2207 if (session->kernel_session != NULL) {
2208 DBG3("Listing domains found kernel domain");
2209 nb_dom++;
2210 }
2211
2212 if (session->ust_session != NULL) {
2213 DBG3("Listing domains found UST global domain");
2214 nb_dom++;
2215 }
2216
2217 *domains = zmalloc(nb_dom * sizeof(struct lttng_domain));
2218 if (*domains == NULL) {
f73fabfd 2219 ret = LTTNG_ERR_FATAL;
2f77fc4b
DG
2220 goto error;
2221 }
2222
2223 if (session->kernel_session != NULL) {
2224 (*domains)[index].type = LTTNG_DOMAIN_KERNEL;
2225 index++;
2226 }
2227
2228 if (session->ust_session != NULL) {
2229 (*domains)[index].type = LTTNG_DOMAIN_UST;
88c5f0d8 2230 (*domains)[index].buf_type = session->ust_session->buffer_type;
2f77fc4b
DG
2231 index++;
2232 }
2233
2234 return nb_dom;
2235
2236error:
f73fabfd
DG
2237 /* Return negative value to differentiate return code */
2238 return -ret;
2f77fc4b
DG
2239}
2240
2241
2242/*
2243 * Command LTTNG_LIST_CHANNELS processed by the client thread.
2244 */
2245ssize_t cmd_list_channels(int domain, struct ltt_session *session,
2246 struct lttng_channel **channels)
2247{
2248 int ret;
2249 ssize_t nb_chan = 0;
2250
2251 switch (domain) {
2252 case LTTNG_DOMAIN_KERNEL:
2253 if (session->kernel_session != NULL) {
2254 nb_chan = session->kernel_session->channel_count;
2255 }
2256 DBG3("Number of kernel channels %zd", nb_chan);
c7d620a2
DG
2257 if (nb_chan <= 0) {
2258 ret = LTTNG_ERR_KERN_CHAN_NOT_FOUND;
2259 }
2f77fc4b
DG
2260 break;
2261 case LTTNG_DOMAIN_UST:
2262 if (session->ust_session != NULL) {
2263 nb_chan = lttng_ht_get_count(
2264 session->ust_session->domain_global.channels);
2265 }
2266 DBG3("Number of UST global channels %zd", nb_chan);
c7d620a2
DG
2267 if (nb_chan <= 0) {
2268 ret = LTTNG_ERR_UST_CHAN_NOT_FOUND;
2269 }
2f77fc4b
DG
2270 break;
2271 default:
2272 *channels = NULL;
f73fabfd 2273 ret = LTTNG_ERR_UND;
2f77fc4b
DG
2274 goto error;
2275 }
2276
2277 if (nb_chan > 0) {
2278 *channels = zmalloc(nb_chan * sizeof(struct lttng_channel));
2279 if (*channels == NULL) {
f73fabfd 2280 ret = LTTNG_ERR_FATAL;
2f77fc4b
DG
2281 goto error;
2282 }
2283
2284 list_lttng_channels(domain, session, *channels);
2285 } else {
2286 *channels = NULL;
c7d620a2
DG
2287 /* Ret value was set in the domain switch case */
2288 goto error;
2f77fc4b
DG
2289 }
2290
2291 return nb_chan;
2292
2293error:
f73fabfd
DG
2294 /* Return negative value to differentiate return code */
2295 return -ret;
2f77fc4b
DG
2296}
2297
2298/*
2299 * Command LTTNG_LIST_EVENTS processed by the client thread.
2300 */
2301ssize_t cmd_list_events(int domain, struct ltt_session *session,
2302 char *channel_name, struct lttng_event **events)
2303{
2304 int ret = 0;
2305 ssize_t nb_event = 0;
2306
2307 switch (domain) {
2308 case LTTNG_DOMAIN_KERNEL:
2309 if (session->kernel_session != NULL) {
2310 nb_event = list_lttng_kernel_events(channel_name,
2311 session->kernel_session, events);
2312 }
2313 break;
2314 case LTTNG_DOMAIN_UST:
2315 {
2316 if (session->ust_session != NULL) {
2317 nb_event = list_lttng_ust_global_events(channel_name,
2318 &session->ust_session->domain_global, events);
2319 }
2320 break;
2321 }
2322 default:
f73fabfd 2323 ret = LTTNG_ERR_UND;
2f77fc4b
DG
2324 goto error;
2325 }
2326
f73fabfd 2327 return nb_event;
2f77fc4b
DG
2328
2329error:
f73fabfd
DG
2330 /* Return negative value to differentiate return code */
2331 return -ret;
2f77fc4b
DG
2332}
2333
2334/*
2335 * Using the session list, filled a lttng_session array to send back to the
2336 * client for session listing.
2337 *
2338 * The session list lock MUST be acquired before calling this function. Use
2339 * session_lock_list() and session_unlock_list().
2340 */
2341void cmd_list_lttng_sessions(struct lttng_session *sessions, uid_t uid,
2342 gid_t gid)
2343{
2344 int ret;
2345 unsigned int i = 0;
2346 struct ltt_session *session;
2347 struct ltt_session_list *list = session_get_list();
2348
2349 DBG("Getting all available session for UID %d GID %d",
2350 uid, gid);
2351 /*
2352 * Iterate over session list and append data after the control struct in
2353 * the buffer.
2354 */
2355 cds_list_for_each_entry(session, &list->head, list) {
2356 /*
2357 * Only list the sessions the user can control.
2358 */
2359 if (!session_access_ok(session, uid, gid)) {
2360 continue;
2361 }
2362
2363 struct ltt_kernel_session *ksess = session->kernel_session;
2364 struct ltt_ust_session *usess = session->ust_session;
2365
2366 if (session->consumer->type == CONSUMER_DST_NET ||
2367 (ksess && ksess->consumer->type == CONSUMER_DST_NET) ||
2368 (usess && usess->consumer->type == CONSUMER_DST_NET)) {
2369 ret = build_network_session_path(sessions[i].path,
dec56f6c 2370 sizeof(sessions[i].path), session);
2f77fc4b 2371 } else {
dec56f6c 2372 ret = snprintf(sessions[i].path, sizeof(sessions[i].path), "%s",
2f77fc4b
DG
2373 session->consumer->dst.trace_path);
2374 }
2375 if (ret < 0) {
2376 PERROR("snprintf session path");
2377 continue;
2378 }
2379
2380 strncpy(sessions[i].name, session->name, NAME_MAX);
2381 sessions[i].name[NAME_MAX - 1] = '\0';
2382 sessions[i].enabled = session->enabled;
2cbf8fed 2383 sessions[i].snapshot_mode = session->snapshot_mode;
2f77fc4b
DG
2384 i++;
2385 }
2386}
2387
806e2684 2388/*
6d805429 2389 * Command LTTNG_DATA_PENDING returning 0 if the data is NOT pending meaning
d3f14b8a 2390 * ready for trace analysis (or any kind of reader) or else 1 for pending data.
806e2684 2391 */
6d805429 2392int cmd_data_pending(struct ltt_session *session)
806e2684
DG
2393{
2394 int ret;
2395 struct ltt_kernel_session *ksess = session->kernel_session;
2396 struct ltt_ust_session *usess = session->ust_session;
2397
2398 assert(session);
2399
2400 /* Session MUST be stopped to ask for data availability. */
2401 if (session->enabled) {
2402 ret = LTTNG_ERR_SESSION_STARTED;
2403 goto error;
2404 }
2405
2406 if (ksess && ksess->consumer) {
6d805429
DG
2407 ret = consumer_is_data_pending(ksess->id, ksess->consumer);
2408 if (ret == 1) {
806e2684
DG
2409 /* Data is still being extracted for the kernel. */
2410 goto error;
2411 }
2412 }
2413
2414 if (usess && usess->consumer) {
6d805429
DG
2415 ret = consumer_is_data_pending(usess->id, usess->consumer);
2416 if (ret == 1) {
806e2684
DG
2417 /* Data is still being extracted for the kernel. */
2418 goto error;
2419 }
2420 }
2421
2422 /* Data is ready to be read by a viewer */
6d805429 2423 ret = 0;
806e2684
DG
2424
2425error:
2426 return ret;
2427}
2428
6dc3064a
DG
2429/*
2430 * Command LTTNG_SNAPSHOT_ADD_OUTPUT from the lttng ctl library.
2431 *
2432 * Return LTTNG_OK on success or else a LTTNG_ERR code.
2433 */
2434int cmd_snapshot_add_output(struct ltt_session *session,
2435 struct lttng_snapshot_output *output, uint32_t *id)
2436{
2437 int ret;
2438 struct snapshot_output *new_output;
2439
2440 assert(session);
2441 assert(output);
2442
2443 DBG("Cmd snapshot add output for session %s", session->name);
2444
2445 /*
d3f14b8a
MD
2446 * Permission denied to create an output if the session is not
2447 * set in no output mode.
6dc3064a
DG
2448 */
2449 if (session->output_traces) {
2450 ret = LTTNG_ERR_EPERM;
2451 goto error;
2452 }
2453
2454 /* Only one output is allowed until we have the "tee" feature. */
2455 if (session->snapshot.nb_output == 1) {
2456 ret = LTTNG_ERR_SNAPSHOT_OUTPUT_EXIST;
2457 goto error;
2458 }
2459
2460 new_output = snapshot_output_alloc();
2461 if (!new_output) {
2462 ret = LTTNG_ERR_NOMEM;
2463 goto error;
2464 }
2465
2466 ret = snapshot_output_init(output->max_size, output->name,
2467 output->ctrl_url, output->data_url, session->consumer, new_output,
2468 &session->snapshot);
2469 if (ret < 0) {
2470 if (ret == -ENOMEM) {
2471 ret = LTTNG_ERR_NOMEM;
2472 } else {
2473 ret = LTTNG_ERR_INVALID;
2474 }
2475 goto free_error;
2476 }
2477
6dc3064a
DG
2478 rcu_read_lock();
2479 snapshot_add_output(&session->snapshot, new_output);
2480 if (id) {
2481 *id = new_output->id;
2482 }
2483 rcu_read_unlock();
2484
2485 return LTTNG_OK;
2486
2487free_error:
2488 snapshot_output_destroy(new_output);
2489error:
2490 return ret;
2491}
2492
2493/*
2494 * Command LTTNG_SNAPSHOT_DEL_OUTPUT from lib lttng ctl.
2495 *
2496 * Return LTTNG_OK on success or else a LTTNG_ERR code.
2497 */
2498int cmd_snapshot_del_output(struct ltt_session *session,
2499 struct lttng_snapshot_output *output)
2500{
2501 int ret;
eb240553 2502 struct snapshot_output *sout = NULL;
6dc3064a
DG
2503
2504 assert(session);
2505 assert(output);
2506
6dc3064a
DG
2507 rcu_read_lock();
2508
2509 /*
d3f14b8a
MD
2510 * Permission denied to create an output if the session is not
2511 * set in no output mode.
6dc3064a
DG
2512 */
2513 if (session->output_traces) {
2514 ret = LTTNG_ERR_EPERM;
2515 goto error;
2516 }
2517
eb240553
DG
2518 if (output->id) {
2519 DBG("Cmd snapshot del output id %" PRIu32 " for session %s", output->id,
2520 session->name);
2521 sout = snapshot_find_output_by_id(output->id, &session->snapshot);
2522 } else if (*output->name != '\0') {
2523 DBG("Cmd snapshot del output name %s for session %s", output->name,
2524 session->name);
2525 sout = snapshot_find_output_by_name(output->name, &session->snapshot);
2526 }
6dc3064a
DG
2527 if (!sout) {
2528 ret = LTTNG_ERR_INVALID;
2529 goto error;
2530 }
2531
2532 snapshot_delete_output(&session->snapshot, sout);
2533 snapshot_output_destroy(sout);
2534 ret = LTTNG_OK;
2535
2536error:
2537 rcu_read_unlock();
2538 return ret;
2539}
2540
2541/*
2542 * Command LTTNG_SNAPSHOT_LIST_OUTPUT from lib lttng ctl.
2543 *
2544 * If no output is available, outputs is untouched and 0 is returned.
2545 *
2546 * Return the size of the newly allocated outputs or a negative LTTNG_ERR code.
2547 */
2548ssize_t cmd_snapshot_list_outputs(struct ltt_session *session,
2549 struct lttng_snapshot_output **outputs)
2550{
2551 int ret, idx = 0;
2552 struct lttng_snapshot_output *list;
2553 struct lttng_ht_iter iter;
2554 struct snapshot_output *output;
2555
2556 assert(session);
2557 assert(outputs);
2558
2559 DBG("Cmd snapshot list outputs for session %s", session->name);
2560
2561 /*
d3f14b8a
MD
2562 * Permission denied to create an output if the session is not
2563 * set in no output mode.
6dc3064a
DG
2564 */
2565 if (session->output_traces) {
2566 ret = LTTNG_ERR_EPERM;
2567 goto error;
2568 }
2569
2570 if (session->snapshot.nb_output == 0) {
2571 ret = 0;
2572 goto error;
2573 }
2574
2575 list = zmalloc(session->snapshot.nb_output * sizeof(*list));
2576 if (!list) {
2577 ret = LTTNG_ERR_NOMEM;
2578 goto error;
2579 }
2580
2581 /* Copy list from session to the new list object. */
2582 cds_lfht_for_each_entry(session->snapshot.output_ht->ht, &iter.iter,
2583 output, node.node) {
2584 assert(output->consumer);
2585 list[idx].id = output->id;
2586 list[idx].max_size = output->max_size;
2587 strncpy(list[idx].name, output->name, sizeof(list[idx].name));
2588 if (output->consumer->type == CONSUMER_DST_LOCAL) {
2589 strncpy(list[idx].ctrl_url, output->consumer->dst.trace_path,
2590 sizeof(list[idx].ctrl_url));
2591 } else {
2592 /* Control URI. */
2593 ret = uri_to_str_url(&output->consumer->dst.net.control,
2594 list[idx].ctrl_url, sizeof(list[idx].ctrl_url));
2595 if (ret < 0) {
2596 ret = LTTNG_ERR_NOMEM;
2597 goto free_error;
2598 }
2599
2600 /* Data URI. */
2601 ret = uri_to_str_url(&output->consumer->dst.net.data,
2602 list[idx].data_url, sizeof(list[idx].data_url));
2603 if (ret < 0) {
2604 ret = LTTNG_ERR_NOMEM;
2605 goto free_error;
2606 }
2607 }
2608 idx++;
2609 }
2610
2611 *outputs = list;
2612 return session->snapshot.nb_output;
2613
2614free_error:
2615 free(list);
2616error:
2617 return -ret;
2618}
2619
2620/*
2621 * Send relayd sockets from snapshot output to consumer. Ignore request if the
2622 * snapshot output is *not* set with a remote destination.
2623 *
a934f4af 2624 * Return 0 on success or a LTTNG_ERR code.
6dc3064a
DG
2625 */
2626static int set_relayd_for_snapshot(struct consumer_output *consumer,
2627 struct snapshot_output *snap_output, struct ltt_session *session)
2628{
a934f4af 2629 int ret = LTTNG_OK;
6dc3064a
DG
2630 struct lttng_ht_iter iter;
2631 struct consumer_socket *socket;
2632
2633 assert(consumer);
2634 assert(snap_output);
2635 assert(session);
2636
2637 DBG2("Set relayd object from snapshot output");
2638
2639 /* Ignore if snapshot consumer output is not network. */
2640 if (snap_output->consumer->type != CONSUMER_DST_NET) {
2641 goto error;
2642 }
2643
2644 /*
2645 * For each consumer socket, create and send the relayd object of the
2646 * snapshot output.
2647 */
2648 rcu_read_lock();
5eecee74
DG
2649 cds_lfht_for_each_entry(snap_output->consumer->socks->ht, &iter.iter,
2650 socket, node.node) {
6dc3064a 2651 ret = send_consumer_relayd_sockets(0, session->id,
d3e2ba59
JD
2652 snap_output->consumer, socket,
2653 session->name, session->hostname,
2654 session->live_timer);
a934f4af 2655 if (ret != LTTNG_OK) {
6dc3064a
DG
2656 rcu_read_unlock();
2657 goto error;
2658 }
2659 }
2660 rcu_read_unlock();
2661
2662error:
2663 return ret;
2664}
2665
2666/*
2667 * Record a kernel snapshot.
2668 *
a934f4af 2669 * Return 0 on success or a LTTNG_ERR code.
6dc3064a
DG
2670 */
2671static int record_kernel_snapshot(struct ltt_kernel_session *ksess,
5c786ded
JD
2672 struct snapshot_output *output, struct ltt_session *session,
2673 int wait, int nb_streams)
6dc3064a
DG
2674{
2675 int ret;
2676
2677 assert(ksess);
2678 assert(output);
2679 assert(session);
2680
10a50311
JD
2681 /* Get the datetime for the snapshot output directory. */
2682 ret = utils_get_current_time_str("%Y%m%d-%H%M%S", output->datetime,
2683 sizeof(output->datetime));
2684 if (!ret) {
a934f4af 2685 ret = LTTNG_ERR_INVALID;
10a50311
JD
2686 goto error;
2687 }
2688
af706bb7
DG
2689 /*
2690 * Copy kernel session sockets so we can communicate with the right
2691 * consumer for the snapshot record command.
2692 */
2693 ret = consumer_copy_sockets(output->consumer, ksess->consumer);
2694 if (ret < 0) {
a934f4af 2695 ret = LTTNG_ERR_NOMEM;
af706bb7 2696 goto error;
6dc3064a
DG
2697 }
2698
2699 ret = set_relayd_for_snapshot(ksess->consumer, output, session);
a934f4af 2700 if (ret != LTTNG_OK) {
af706bb7 2701 goto error_snapshot;
6dc3064a
DG
2702 }
2703
5c786ded 2704 ret = kernel_snapshot_record(ksess, output, wait, nb_streams);
2a06df8d 2705 if (ret != LTTNG_OK) {
af706bb7 2706 goto error_snapshot;
6dc3064a
DG
2707 }
2708
a934f4af
DG
2709 ret = LTTNG_OK;
2710
af706bb7
DG
2711error_snapshot:
2712 /* Clean up copied sockets so this output can use some other later on. */
2713 consumer_destroy_output_sockets(output->consumer);
6dc3064a
DG
2714error:
2715 return ret;
2716}
2717
2718/*
2719 * Record a UST snapshot.
2720 *
a934f4af 2721 * Return 0 on success or a LTTNG_ERR error code.
6dc3064a
DG
2722 */
2723static int record_ust_snapshot(struct ltt_ust_session *usess,
5c786ded
JD
2724 struct snapshot_output *output, struct ltt_session *session,
2725 int wait, int nb_streams)
6dc3064a
DG
2726{
2727 int ret;
2728
2729 assert(usess);
2730 assert(output);
2731 assert(session);
2732
10a50311
JD
2733 /* Get the datetime for the snapshot output directory. */
2734 ret = utils_get_current_time_str("%Y%m%d-%H%M%S", output->datetime,
2735 sizeof(output->datetime));
2736 if (!ret) {
a934f4af 2737 ret = LTTNG_ERR_INVALID;
10a50311
JD
2738 goto error;
2739 }
2740
af706bb7 2741 /*
d3f14b8a 2742 * Copy UST session sockets so we can communicate with the right
af706bb7
DG
2743 * consumer for the snapshot record command.
2744 */
2745 ret = consumer_copy_sockets(output->consumer, usess->consumer);
2746 if (ret < 0) {
a934f4af 2747 ret = LTTNG_ERR_NOMEM;
af706bb7 2748 goto error;
6dc3064a
DG
2749 }
2750
2751 ret = set_relayd_for_snapshot(usess->consumer, output, session);
a934f4af 2752 if (ret != LTTNG_OK) {
af706bb7 2753 goto error_snapshot;
6dc3064a
DG
2754 }
2755
5c786ded 2756 ret = ust_app_snapshot_record(usess, output, wait, nb_streams);
6dc3064a 2757 if (ret < 0) {
5c786ded 2758 if (ret == -EINVAL) {
a934f4af 2759 ret = LTTNG_ERR_INVALID;
86170a9c 2760 goto error_snapshot;
5c786ded 2761 }
86170a9c
CB
2762
2763 ret = LTTNG_ERR_SNAPSHOT_FAIL;
af706bb7 2764 goto error_snapshot;
6dc3064a
DG
2765 }
2766
a934f4af
DG
2767 ret = LTTNG_OK;
2768
af706bb7
DG
2769error_snapshot:
2770 /* Clean up copied sockets so this output can use some other later on. */
2771 consumer_destroy_output_sockets(output->consumer);
6dc3064a
DG
2772error:
2773 return ret;
2774}
2775
5c786ded
JD
2776/*
2777 * Returns the total number of streams for a session or a negative value
2778 * on error.
2779 */
2780static unsigned int get_total_nb_stream(struct ltt_session *session)
2781{
2782 unsigned int total_streams = 0;
2783
2784 if (session->kernel_session) {
2785 struct ltt_kernel_session *ksess = session->kernel_session;
2786
2787 total_streams += ksess->stream_count_global;
2788 }
2789
2790 if (session->ust_session) {
2791 struct ltt_ust_session *usess = session->ust_session;
2792
2793 total_streams += ust_app_get_nb_stream(usess);
2794 }
2795
2796 return total_streams;
2797}
2798
6dc3064a
DG
2799/*
2800 * Command LTTNG_SNAPSHOT_RECORD from lib lttng ctl.
2801 *
2802 * The wait parameter is ignored so this call always wait for the snapshot to
2803 * complete before returning.
2804 *
2805 * Return LTTNG_OK on success or else a LTTNG_ERR code.
2806 */
2807int cmd_snapshot_record(struct ltt_session *session,
2808 struct lttng_snapshot_output *output, int wait)
2809{
2810 int ret = LTTNG_OK;
e1986656
DG
2811 unsigned int use_tmp_output = 0;
2812 struct snapshot_output tmp_output;
1bfe7328 2813 unsigned int nb_streams, snapshot_success = 0;
6dc3064a
DG
2814
2815 assert(session);
2816
2817 DBG("Cmd snapshot record for session %s", session->name);
2818
2819 /*
d3f14b8a
MD
2820 * Permission denied to create an output if the session is not
2821 * set in no output mode.
6dc3064a
DG
2822 */
2823 if (session->output_traces) {
2824 ret = LTTNG_ERR_EPERM;
2825 goto error;
2826 }
2827
2828 /* The session needs to be started at least once. */
2829 if (!session->started) {
2830 ret = LTTNG_ERR_START_SESSION_ONCE;
2831 goto error;
2832 }
2833
2834 /* Use temporary output for the session. */
2835 if (output && *output->ctrl_url != '\0') {
6dc3064a
DG
2836 ret = snapshot_output_init(output->max_size, output->name,
2837 output->ctrl_url, output->data_url, session->consumer,
e1986656 2838 &tmp_output, NULL);
6dc3064a
DG
2839 if (ret < 0) {
2840 if (ret == -ENOMEM) {
2841 ret = LTTNG_ERR_NOMEM;
2842 } else {
2843 ret = LTTNG_ERR_INVALID;
2844 }
2845 goto error;
2846 }
1bfe7328
DG
2847 /* Use the global session count for the temporary snapshot. */
2848 tmp_output.nb_snapshot = session->snapshot.nb_snapshot;
e1986656 2849 use_tmp_output = 1;
6dc3064a
DG
2850 }
2851
5c786ded
JD
2852 /*
2853 * Get the total number of stream of that session which is used by the
2854 * maximum size of the snapshot feature.
2855 */
2856 nb_streams = get_total_nb_stream(session);
2857
6dc3064a
DG
2858 if (session->kernel_session) {
2859 struct ltt_kernel_session *ksess = session->kernel_session;
2860
e1986656
DG
2861 if (use_tmp_output) {
2862 ret = record_kernel_snapshot(ksess, &tmp_output, session,
5c786ded 2863 wait, nb_streams);
a934f4af 2864 if (ret != LTTNG_OK) {
6dc3064a
DG
2865 goto error;
2866 }
1bfe7328 2867 snapshot_success = 1;
6dc3064a
DG
2868 } else {
2869 struct snapshot_output *sout;
2870 struct lttng_ht_iter iter;
2871
2872 rcu_read_lock();
2873 cds_lfht_for_each_entry(session->snapshot.output_ht->ht,
2874 &iter.iter, sout, node.node) {
e1986656
DG
2875 /*
2876 * Make a local copy of the output and assign the possible
2877 * temporary value given by the caller.
2878 */
2879 memset(&tmp_output, 0, sizeof(tmp_output));
2880 memcpy(&tmp_output, sout, sizeof(tmp_output));
2881
2882 /* Use temporary max size. */
2883 if (output->max_size != (uint64_t) -1ULL) {
2884 tmp_output.max_size = output->max_size;
2885 }
2886
2887 /* Use temporary name. */
2888 if (*output->name != '\0') {
2889 strncpy(tmp_output.name, output->name,
2890 sizeof(tmp_output.name));
2891 }
2892
1bfe7328
DG
2893 tmp_output.nb_snapshot = session->snapshot.nb_snapshot;
2894
e1986656 2895 ret = record_kernel_snapshot(ksess, &tmp_output,
5c786ded 2896 session, wait, nb_streams);
a934f4af 2897 if (ret != LTTNG_OK) {
6dc3064a
DG
2898 rcu_read_unlock();
2899 goto error;
2900 }
1bfe7328 2901 snapshot_success = 1;
6dc3064a
DG
2902 }
2903 rcu_read_unlock();
2904 }
2905 }
2906
2907 if (session->ust_session) {
2908 struct ltt_ust_session *usess = session->ust_session;
2909
e1986656
DG
2910 if (use_tmp_output) {
2911 ret = record_ust_snapshot(usess, &tmp_output, session,
5c786ded 2912 wait, nb_streams);
a934f4af 2913 if (ret != LTTNG_OK) {
6dc3064a
DG
2914 goto error;
2915 }
1bfe7328 2916 snapshot_success = 1;
6dc3064a
DG
2917 } else {
2918 struct snapshot_output *sout;
2919 struct lttng_ht_iter iter;
2920
2921 rcu_read_lock();
2922 cds_lfht_for_each_entry(session->snapshot.output_ht->ht,
2923 &iter.iter, sout, node.node) {
e1986656
DG
2924 /*
2925 * Make a local copy of the output and assign the possible
2926 * temporary value given by the caller.
2927 */
2928 memset(&tmp_output, 0, sizeof(tmp_output));
2929 memcpy(&tmp_output, sout, sizeof(tmp_output));
2930
e1986656
DG
2931 /* Use temporary max size. */
2932 if (output->max_size != (uint64_t) -1ULL) {
2933 tmp_output.max_size = output->max_size;
2934 }
2935
2936 /* Use temporary name. */
2937 if (*output->name != '\0') {
2938 strncpy(tmp_output.name, output->name,
2939 sizeof(tmp_output.name));
2940 }
2941
1bfe7328
DG
2942 tmp_output.nb_snapshot = session->snapshot.nb_snapshot;
2943
e1986656 2944 ret = record_ust_snapshot(usess, &tmp_output, session,
5c786ded 2945 wait, nb_streams);
a934f4af 2946 if (ret != LTTNG_OK) {
6dc3064a
DG
2947 rcu_read_unlock();
2948 goto error;
2949 }
1bfe7328 2950 snapshot_success = 1;
6dc3064a
DG
2951 }
2952 rcu_read_unlock();
2953 }
2954 }
2955
1bfe7328
DG
2956 if (snapshot_success) {
2957 session->snapshot.nb_snapshot++;
b67578cb
MD
2958 } else {
2959 ret = LTTNG_ERR_SNAPSHOT_FAIL;
1bfe7328
DG
2960 }
2961
6dc3064a 2962error:
6dc3064a
DG
2963 return ret;
2964}
2965
2f77fc4b
DG
2966/*
2967 * Init command subsystem.
2968 */
2969void cmd_init(void)
2970{
2971 /*
d88aee68
DG
2972 * Set network sequence index to 1 for streams to match a relayd
2973 * socket on the consumer side.
2f77fc4b 2974 */
d88aee68
DG
2975 pthread_mutex_lock(&relayd_net_seq_idx_lock);
2976 relayd_net_seq_idx = 1;
2977 pthread_mutex_unlock(&relayd_net_seq_idx_lock);
2f77fc4b
DG
2978
2979 DBG("Command subsystem initialized");
2980}
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