Fix: clarify tracefile size/count in lttng.1 man
[lttng-tools.git] / src / bin / lttng-sessiond / cmd.c
CommitLineData
2f77fc4b
DG
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>
20#include <urcu/list.h>
21#include <urcu/uatomic.h>
22
23#include <common/defaults.h>
24#include <common/common.h>
25#include <common/sessiond-comm/sessiond-comm.h>
26#include <common/relayd/relayd.h>
27
28#include "channel.h"
29#include "consumer.h"
30#include "event.h"
7972aab2 31#include "health.h"
2f77fc4b
DG
32#include "kernel.h"
33#include "kernel-consumer.h"
34#include "lttng-sessiond.h"
35#include "utils.h"
36
37#include "cmd.h"
38
39/*
40 * Used to keep a unique index for each relayd socket created where this value
41 * is associated with streams on the consumer so it can match the right relayd
d88aee68
DG
42 * to send to. It must be accessed with the relayd_net_seq_idx_lock
43 * held.
2f77fc4b 44 */
d88aee68
DG
45static pthread_mutex_t relayd_net_seq_idx_lock = PTHREAD_MUTEX_INITIALIZER;
46static uint64_t relayd_net_seq_idx;
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47
48/*
49 * Create a session path used by list_lttng_sessions for the case that the
50 * session consumer is on the network.
51 */
52static int build_network_session_path(char *dst, size_t size,
53 struct ltt_session *session)
54{
55 int ret, kdata_port, udata_port;
56 struct lttng_uri *kuri = NULL, *uuri = NULL, *uri = NULL;
57 char tmp_uurl[PATH_MAX], tmp_urls[PATH_MAX];
58
59 assert(session);
60 assert(dst);
61
62 memset(tmp_urls, 0, sizeof(tmp_urls));
63 memset(tmp_uurl, 0, sizeof(tmp_uurl));
64
65 kdata_port = udata_port = DEFAULT_NETWORK_DATA_PORT;
66
67 if (session->kernel_session && session->kernel_session->consumer) {
68 kuri = &session->kernel_session->consumer->dst.net.control;
69 kdata_port = session->kernel_session->consumer->dst.net.data.port;
70 }
71
72 if (session->ust_session && session->ust_session->consumer) {
73 uuri = &session->ust_session->consumer->dst.net.control;
74 udata_port = session->ust_session->consumer->dst.net.data.port;
75 }
76
77 if (uuri == NULL && kuri == NULL) {
78 uri = &session->consumer->dst.net.control;
79 kdata_port = session->consumer->dst.net.data.port;
80 } else if (kuri && uuri) {
81 ret = uri_compare(kuri, uuri);
82 if (ret) {
83 /* Not Equal */
84 uri = kuri;
85 /* Build uuri URL string */
86 ret = uri_to_str_url(uuri, tmp_uurl, sizeof(tmp_uurl));
87 if (ret < 0) {
88 goto error;
89 }
90 } else {
91 uri = kuri;
92 }
93 } else if (kuri && uuri == NULL) {
94 uri = kuri;
95 } else if (uuri && kuri == NULL) {
96 uri = uuri;
97 }
98
99 ret = uri_to_str_url(uri, tmp_urls, sizeof(tmp_urls));
100 if (ret < 0) {
101 goto error;
102 }
103
9aa9f900
DG
104 /*
105 * Do we have a UST url set. If yes, this means we have both kernel and UST
106 * to print.
107 */
9d035200 108 if (*tmp_uurl != '\0') {
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109 ret = snprintf(dst, size, "[K]: %s [data: %d] -- [U]: %s [data: %d]",
110 tmp_urls, kdata_port, tmp_uurl, udata_port);
111 } else {
9aa9f900 112 int dport;
bef08707 113 if (kuri || (!kuri && !uuri)) {
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114 dport = kdata_port;
115 } else {
116 /* No kernel URI, use the UST port. */
117 dport = udata_port;
118 }
119 ret = snprintf(dst, size, "%s [data: %d]", tmp_urls, dport);
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DG
120 }
121
122error:
123 return ret;
124}
125
126/*
127 * Fill lttng_channel array of all channels.
128 */
129static void list_lttng_channels(int domain, struct ltt_session *session,
130 struct lttng_channel *channels)
131{
132 int i = 0;
133 struct ltt_kernel_channel *kchan;
134
135 DBG("Listing channels for session %s", session->name);
136
137 switch (domain) {
138 case LTTNG_DOMAIN_KERNEL:
139 /* Kernel channels */
140 if (session->kernel_session != NULL) {
141 cds_list_for_each_entry(kchan,
142 &session->kernel_session->channel_list.head, list) {
143 /* Copy lttng_channel struct to array */
144 memcpy(&channels[i], kchan->channel, sizeof(struct lttng_channel));
145 channels[i].enabled = kchan->enabled;
146 i++;
147 }
148 }
149 break;
150 case LTTNG_DOMAIN_UST:
151 {
152 struct lttng_ht_iter iter;
153 struct ltt_ust_channel *uchan;
154
e7fe706f 155 rcu_read_lock();
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156 cds_lfht_for_each_entry(session->ust_session->domain_global.channels->ht,
157 &iter.iter, uchan, node.node) {
158 strncpy(channels[i].name, uchan->name, LTTNG_SYMBOL_NAME_LEN);
159 channels[i].attr.overwrite = uchan->attr.overwrite;
160 channels[i].attr.subbuf_size = uchan->attr.subbuf_size;
161 channels[i].attr.num_subbuf = uchan->attr.num_subbuf;
162 channels[i].attr.switch_timer_interval =
163 uchan->attr.switch_timer_interval;
164 channels[i].attr.read_timer_interval =
165 uchan->attr.read_timer_interval;
166 channels[i].enabled = uchan->enabled;
167 switch (uchan->attr.output) {
168 case LTTNG_UST_MMAP:
169 default:
170 channels[i].attr.output = LTTNG_EVENT_MMAP;
171 break;
172 }
173 i++;
174 }
e7fe706f 175 rcu_read_unlock();
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176 break;
177 }
178 default:
179 break;
180 }
181}
182
183/*
184 * Create a list of ust global domain events.
185 */
186static int list_lttng_ust_global_events(char *channel_name,
187 struct ltt_ust_domain_global *ust_global, struct lttng_event **events)
188{
189 int i = 0, ret = 0;
190 unsigned int nb_event = 0;
191 struct lttng_ht_iter iter;
192 struct lttng_ht_node_str *node;
193 struct ltt_ust_channel *uchan;
194 struct ltt_ust_event *uevent;
195 struct lttng_event *tmp;
196
197 DBG("Listing UST global events for channel %s", channel_name);
198
199 rcu_read_lock();
200
201 lttng_ht_lookup(ust_global->channels, (void *)channel_name, &iter);
202 node = lttng_ht_iter_get_node_str(&iter);
203 if (node == NULL) {
f73fabfd 204 ret = LTTNG_ERR_UST_CHAN_NOT_FOUND;
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DG
205 goto error;
206 }
207
208 uchan = caa_container_of(&node->node, struct ltt_ust_channel, node.node);
209
210 nb_event += lttng_ht_get_count(uchan->events);
211
212 if (nb_event == 0) {
213 ret = nb_event;
214 goto error;
215 }
216
217 DBG3("Listing UST global %d events", nb_event);
218
219 tmp = zmalloc(nb_event * sizeof(struct lttng_event));
220 if (tmp == NULL) {
f73fabfd 221 ret = LTTNG_ERR_FATAL;
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DG
222 goto error;
223 }
224
225 cds_lfht_for_each_entry(uchan->events->ht, &iter.iter, uevent, node.node) {
226 strncpy(tmp[i].name, uevent->attr.name, LTTNG_SYMBOL_NAME_LEN);
227 tmp[i].name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0';
228 tmp[i].enabled = uevent->enabled;
229
230 switch (uevent->attr.instrumentation) {
231 case LTTNG_UST_TRACEPOINT:
232 tmp[i].type = LTTNG_EVENT_TRACEPOINT;
233 break;
234 case LTTNG_UST_PROBE:
235 tmp[i].type = LTTNG_EVENT_PROBE;
236 break;
237 case LTTNG_UST_FUNCTION:
238 tmp[i].type = LTTNG_EVENT_FUNCTION;
239 break;
240 }
241
242 tmp[i].loglevel = uevent->attr.loglevel;
243 switch (uevent->attr.loglevel_type) {
244 case LTTNG_UST_LOGLEVEL_ALL:
245 tmp[i].loglevel_type = LTTNG_EVENT_LOGLEVEL_ALL;
246 break;
247 case LTTNG_UST_LOGLEVEL_RANGE:
248 tmp[i].loglevel_type = LTTNG_EVENT_LOGLEVEL_RANGE;
249 break;
250 case LTTNG_UST_LOGLEVEL_SINGLE:
251 tmp[i].loglevel_type = LTTNG_EVENT_LOGLEVEL_SINGLE;
252 break;
253 }
254 if (uevent->filter) {
255 tmp[i].filter = 1;
256 }
257 i++;
258 }
259
260 ret = nb_event;
261 *events = tmp;
262
263error:
264 rcu_read_unlock();
265 return ret;
266}
267
268/*
269 * Fill lttng_event array of all kernel events in the channel.
270 */
271static int list_lttng_kernel_events(char *channel_name,
272 struct ltt_kernel_session *kernel_session, struct lttng_event **events)
273{
274 int i = 0, ret;
275 unsigned int nb_event;
276 struct ltt_kernel_event *event;
277 struct ltt_kernel_channel *kchan;
278
279 kchan = trace_kernel_get_channel_by_name(channel_name, kernel_session);
280 if (kchan == NULL) {
f73fabfd 281 ret = LTTNG_ERR_KERN_CHAN_NOT_FOUND;
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282 goto error;
283 }
284
285 nb_event = kchan->event_count;
286
287 DBG("Listing events for channel %s", kchan->channel->name);
288
289 if (nb_event == 0) {
f73fabfd 290 goto end;
2f77fc4b
DG
291 }
292
293 *events = zmalloc(nb_event * sizeof(struct lttng_event));
294 if (*events == NULL) {
f73fabfd 295 ret = LTTNG_ERR_FATAL;
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DG
296 goto error;
297 }
298
299 /* Kernel channels */
300 cds_list_for_each_entry(event, &kchan->events_list.head , list) {
301 strncpy((*events)[i].name, event->event->name, LTTNG_SYMBOL_NAME_LEN);
302 (*events)[i].name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0';
303 (*events)[i].enabled = event->enabled;
304
305 switch (event->event->instrumentation) {
306 case LTTNG_KERNEL_TRACEPOINT:
307 (*events)[i].type = LTTNG_EVENT_TRACEPOINT;
308 break;
2f77fc4b 309 case LTTNG_KERNEL_KRETPROBE:
1896972b
DG
310 (*events)[i].type = LTTNG_EVENT_FUNCTION;
311 memcpy(&(*events)[i].attr.probe, &event->event->u.kprobe,
312 sizeof(struct lttng_kernel_kprobe));
313 break;
314 case LTTNG_KERNEL_KPROBE:
2f77fc4b
DG
315 (*events)[i].type = LTTNG_EVENT_PROBE;
316 memcpy(&(*events)[i].attr.probe, &event->event->u.kprobe,
317 sizeof(struct lttng_kernel_kprobe));
318 break;
319 case LTTNG_KERNEL_FUNCTION:
320 (*events)[i].type = LTTNG_EVENT_FUNCTION;
321 memcpy(&((*events)[i].attr.ftrace), &event->event->u.ftrace,
322 sizeof(struct lttng_kernel_function));
323 break;
324 case LTTNG_KERNEL_NOOP:
325 (*events)[i].type = LTTNG_EVENT_NOOP;
326 break;
327 case LTTNG_KERNEL_SYSCALL:
328 (*events)[i].type = LTTNG_EVENT_SYSCALL;
329 break;
330 case LTTNG_KERNEL_ALL:
331 assert(0);
332 break;
333 }
334 i++;
335 }
336
f73fabfd 337end:
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338 return nb_event;
339
340error:
f73fabfd
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341 /* Negate the error code to differentiate the size from an error */
342 return -ret;
2f77fc4b
DG
343}
344
345/*
346 * Add URI so the consumer output object. Set the correct path depending on the
347 * domain adding the default trace directory.
348 */
349static int add_uri_to_consumer(struct consumer_output *consumer,
350 struct lttng_uri *uri, int domain, const char *session_name)
351{
f73fabfd 352 int ret = LTTNG_OK;
2f77fc4b
DG
353 const char *default_trace_dir;
354
355 assert(uri);
356
357 if (consumer == NULL) {
358 DBG("No consumer detected. Don't add URI. Stopping.");
f73fabfd 359 ret = LTTNG_ERR_NO_CONSUMER;
2f77fc4b
DG
360 goto error;
361 }
362
363 switch (domain) {
364 case LTTNG_DOMAIN_KERNEL:
365 default_trace_dir = DEFAULT_KERNEL_TRACE_DIR;
366 break;
367 case LTTNG_DOMAIN_UST:
368 default_trace_dir = DEFAULT_UST_TRACE_DIR;
369 break;
370 default:
371 /*
372 * This case is possible is we try to add the URI to the global tracing
373 * session consumer object which in this case there is no subdir.
374 */
375 default_trace_dir = "";
376 }
377
378 switch (uri->dtype) {
379 case LTTNG_DST_IPV4:
380 case LTTNG_DST_IPV6:
381 DBG2("Setting network URI to consumer");
382
df75acac
DG
383 if (consumer->type == CONSUMER_DST_NET) {
384 if ((uri->stype == LTTNG_STREAM_CONTROL &&
785d2d0d
DG
385 consumer->dst.net.control_isset) ||
386 (uri->stype == LTTNG_STREAM_DATA &&
387 consumer->dst.net.data_isset)) {
df75acac
DG
388 ret = LTTNG_ERR_URL_EXIST;
389 goto error;
390 }
391 } else {
392 memset(&consumer->dst.net, 0, sizeof(consumer->dst.net));
785d2d0d
DG
393 }
394
df75acac
DG
395 consumer->type = CONSUMER_DST_NET;
396
2f77fc4b
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397 /* Set URI into consumer output object */
398 ret = consumer_set_network_uri(consumer, uri);
399 if (ret < 0) {
a74934ba 400 ret = -ret;
2f77fc4b
DG
401 goto error;
402 } else if (ret == 1) {
403 /*
404 * URI was the same in the consumer so we do not append the subdir
405 * again so to not duplicate output dir.
406 */
407 goto error;
408 }
409
410 if (uri->stype == LTTNG_STREAM_CONTROL && strlen(uri->subdir) == 0) {
411 ret = consumer_set_subdir(consumer, session_name);
412 if (ret < 0) {
f73fabfd 413 ret = LTTNG_ERR_FATAL;
2f77fc4b
DG
414 goto error;
415 }
416 }
417
418 if (uri->stype == LTTNG_STREAM_CONTROL) {
419 /* On a new subdir, reappend the default trace dir. */
c30ce0b3
CB
420 strncat(consumer->subdir, default_trace_dir,
421 sizeof(consumer->subdir) - strlen(consumer->subdir) - 1);
2f77fc4b
DG
422 DBG3("Append domain trace name to subdir %s", consumer->subdir);
423 }
424
425 break;
426 case LTTNG_DST_PATH:
427 DBG2("Setting trace directory path from URI to %s", uri->dst.path);
428 memset(consumer->dst.trace_path, 0,
429 sizeof(consumer->dst.trace_path));
430 strncpy(consumer->dst.trace_path, uri->dst.path,
431 sizeof(consumer->dst.trace_path));
432 /* Append default trace dir */
433 strncat(consumer->dst.trace_path, default_trace_dir,
c30ce0b3
CB
434 sizeof(consumer->dst.trace_path) -
435 strlen(consumer->dst.trace_path) - 1);
2f77fc4b
DG
436 /* Flag consumer as local. */
437 consumer->type = CONSUMER_DST_LOCAL;
438 break;
439 }
440
a74934ba
DG
441 ret = LTTNG_OK;
442
2f77fc4b
DG
443error:
444 return ret;
445}
446
447/*
448 * Init tracing by creating trace directory and sending fds kernel consumer.
449 */
450static int init_kernel_tracing(struct ltt_kernel_session *session)
451{
452 int ret = 0;
453 struct lttng_ht_iter iter;
454 struct consumer_socket *socket;
455
456 assert(session);
457
e7fe706f
DG
458 rcu_read_lock();
459
2f77fc4b
DG
460 if (session->consumer_fds_sent == 0 && session->consumer != NULL) {
461 cds_lfht_for_each_entry(session->consumer->socks->ht, &iter.iter,
462 socket, node.node) {
463 /* Code flow error */
464 assert(socket->fd >= 0);
465
466 pthread_mutex_lock(socket->lock);
f50f23d9 467 ret = kernel_consumer_send_session(socket, session);
2f77fc4b
DG
468 pthread_mutex_unlock(socket->lock);
469 if (ret < 0) {
f73fabfd 470 ret = LTTNG_ERR_KERN_CONSUMER_FAIL;
2f77fc4b
DG
471 goto error;
472 }
473 }
474 }
475
476error:
e7fe706f 477 rcu_read_unlock();
2f77fc4b
DG
478 return ret;
479}
480
481/*
482 * Create a socket to the relayd using the URI.
483 *
484 * On success, the relayd_sock pointer is set to the created socket.
485 * Else, it's stays untouched and a lttcomm error code is returned.
486 */
6151a90f
JD
487static int create_connect_relayd(struct lttng_uri *uri,
488 struct lttcomm_relayd_sock **relayd_sock)
2f77fc4b
DG
489{
490 int ret;
6151a90f 491 struct lttcomm_relayd_sock *rsock;
2f77fc4b 492
6151a90f
JD
493 rsock = lttcomm_alloc_relayd_sock(uri, RELAYD_VERSION_COMM_MAJOR,
494 RELAYD_VERSION_COMM_MINOR);
495 if (!rsock) {
f73fabfd 496 ret = LTTNG_ERR_FATAL;
2f77fc4b
DG
497 goto error;
498 }
499
ffe60014
DG
500 /*
501 * Connect to relayd so we can proceed with a session creation. This call
502 * can possibly block for an arbitrary amount of time to set the health
503 * state to be in poll execution.
504 */
505 health_poll_entry();
6151a90f 506 ret = relayd_connect(rsock);
ffe60014 507 health_poll_exit();
2f77fc4b
DG
508 if (ret < 0) {
509 ERR("Unable to reach lttng-relayd");
f73fabfd 510 ret = LTTNG_ERR_RELAYD_CONNECT_FAIL;
2f77fc4b
DG
511 goto free_sock;
512 }
513
514 /* Create socket for control stream. */
515 if (uri->stype == LTTNG_STREAM_CONTROL) {
516 DBG3("Creating relayd stream socket from URI");
517
518 /* Check relayd version */
6151a90f 519 ret = relayd_version_check(rsock);
2f77fc4b 520 if (ret < 0) {
f73fabfd 521 ret = LTTNG_ERR_RELAYD_VERSION_FAIL;
2f77fc4b
DG
522 goto close_sock;
523 }
524 } else if (uri->stype == LTTNG_STREAM_DATA) {
525 DBG3("Creating relayd data socket from URI");
526 } else {
527 /* Command is not valid */
528 ERR("Relayd invalid stream type: %d", uri->stype);
f73fabfd 529 ret = LTTNG_ERR_INVALID;
2f77fc4b
DG
530 goto close_sock;
531 }
532
6151a90f 533 *relayd_sock = rsock;
2f77fc4b 534
f73fabfd 535 return LTTNG_OK;
2f77fc4b
DG
536
537close_sock:
6151a90f
JD
538 /* The returned value is not useful since we are on an error path. */
539 (void) relayd_close(rsock);
2f77fc4b 540free_sock:
6151a90f 541 free(rsock);
2f77fc4b
DG
542error:
543 return ret;
544}
545
546/*
547 * Connect to the relayd using URI and send the socket to the right consumer.
548 */
549static int send_consumer_relayd_socket(int domain, struct ltt_session *session,
550 struct lttng_uri *relayd_uri, struct consumer_output *consumer,
f50f23d9 551 struct consumer_socket *consumer_sock)
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
DG
562
563 /* If the control socket is connected, network session is ready */
564 if (relayd_uri->stype == LTTNG_STREAM_CONTROL) {
565 session->net_handle = 1;
566 }
567
2f77fc4b 568 /* Set the network sequence index if not set. */
d88aee68
DG
569 if (consumer->net_seq_index == (uint64_t) -1ULL) {
570 pthread_mutex_lock(&relayd_net_seq_idx_lock);
2f77fc4b
DG
571 /*
572 * Increment net_seq_idx because we are about to transfer the
573 * new relayd socket to the consumer.
d88aee68 574 * Assign unique key so the consumer can match streams.
2f77fc4b 575 */
d88aee68
DG
576 consumer->net_seq_index = ++relayd_net_seq_idx;
577 pthread_mutex_unlock(&relayd_net_seq_idx_lock);
2f77fc4b
DG
578 }
579
2f77fc4b 580 /* Send relayd socket to consumer. */
6151a90f
JD
581 ret = consumer_send_relayd_socket(consumer_sock, rsock, consumer,
582 relayd_uri->stype, session->id);
2f77fc4b 583 if (ret < 0) {
f73fabfd 584 ret = LTTNG_ERR_ENABLE_CONSUMER_FAIL;
2f77fc4b
DG
585 goto close_sock;
586 }
587
c890b720
DG
588 /* Flag that the corresponding socket was sent. */
589 if (relayd_uri->stype == LTTNG_STREAM_CONTROL) {
ffe60014 590 consumer_sock->control_sock_sent = 1;
c890b720 591 } else if (relayd_uri->stype == LTTNG_STREAM_DATA) {
ffe60014 592 consumer_sock->data_sock_sent = 1;
c890b720
DG
593 }
594
f73fabfd 595 ret = LTTNG_OK;
2f77fc4b
DG
596
597 /*
598 * Close socket which was dup on the consumer side. The session daemon does
599 * NOT keep track of the relayd socket(s) once transfer to the consumer.
600 */
601
602close_sock:
6151a90f
JD
603 (void) relayd_close(rsock);
604 free(rsock);
2f77fc4b 605
6151a90f 606error:
ffe60014
DG
607 if (ret != LTTNG_OK) {
608 /*
609 * On error, nullify the consumer sequence index so streams are not
610 * associated with it once sent to the consumer.
611 */
612 uatomic_set(&consumer->net_seq_index, -1);
613 }
2f77fc4b
DG
614 return ret;
615}
616
617/*
618 * Send both relayd sockets to a specific consumer and domain. This is a
619 * helper function to facilitate sending the information to the consumer for a
620 * session.
621 */
622static int send_consumer_relayd_sockets(int domain,
f50f23d9
DG
623 struct ltt_session *session, struct consumer_output *consumer,
624 struct consumer_socket *sock)
2f77fc4b 625{
dda67f6c 626 int ret = LTTNG_OK;
2f77fc4b
DG
627
628 assert(session);
629 assert(consumer);
630
2f77fc4b 631 /* Sending control relayd socket. */
ffe60014 632 if (!sock->control_sock_sent) {
c890b720 633 ret = send_consumer_relayd_socket(domain, session,
f50f23d9 634 &consumer->dst.net.control, consumer, sock);
c890b720
DG
635 if (ret != LTTNG_OK) {
636 goto error;
637 }
2f77fc4b
DG
638 }
639
640 /* Sending data relayd socket. */
ffe60014 641 if (!sock->data_sock_sent) {
c890b720 642 ret = send_consumer_relayd_socket(domain, session,
f50f23d9 643 &consumer->dst.net.data, consumer, sock);
c890b720
DG
644 if (ret != LTTNG_OK) {
645 goto error;
646 }
2f77fc4b
DG
647 }
648
2f77fc4b
DG
649error:
650 return ret;
651}
652
653/*
654 * Setup relayd connections for a tracing session. First creates the socket to
655 * the relayd and send them to the right domain consumer. Consumer type MUST be
656 * network.
657 */
ffe60014 658int cmd_setup_relayd(struct ltt_session *session)
2f77fc4b 659{
f73fabfd 660 int ret = LTTNG_OK;
2f77fc4b
DG
661 struct ltt_ust_session *usess;
662 struct ltt_kernel_session *ksess;
663 struct consumer_socket *socket;
664 struct lttng_ht_iter iter;
665
666 assert(session);
667
668 usess = session->ust_session;
669 ksess = session->kernel_session;
670
785d2d0d 671 DBG("Setting relayd for session %s", session->name);
2f77fc4b 672
e7fe706f
DG
673 rcu_read_lock();
674
2f77fc4b
DG
675 if (usess && usess->consumer && usess->consumer->type == CONSUMER_DST_NET
676 && usess->consumer->enabled) {
677 /* For each consumer socket, send relayd sockets */
678 cds_lfht_for_each_entry(usess->consumer->socks->ht, &iter.iter,
679 socket, node.node) {
680 /* Code flow error */
681 assert(socket->fd >= 0);
682
683 pthread_mutex_lock(socket->lock);
dda67f6c 684 ret = send_consumer_relayd_sockets(LTTNG_DOMAIN_UST, session,
f50f23d9 685 usess->consumer, socket);
2f77fc4b 686 pthread_mutex_unlock(socket->lock);
f73fabfd 687 if (ret != LTTNG_OK) {
2f77fc4b
DG
688 goto error;
689 }
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) {
697 /* Code flow error */
698 assert(socket->fd >= 0);
699
700 pthread_mutex_lock(socket->lock);
dda67f6c 701 ret = send_consumer_relayd_sockets(LTTNG_DOMAIN_KERNEL, session,
f50f23d9 702 ksess->consumer, socket);
2f77fc4b 703 pthread_mutex_unlock(socket->lock);
f73fabfd 704 if (ret != LTTNG_OK) {
2f77fc4b
DG
705 goto error;
706 }
707 }
708 }
709
710error:
e7fe706f 711 rcu_read_unlock();
2f77fc4b
DG
712 return ret;
713}
714
9b6c7ec5
DG
715/*
716 * Start a kernel session by opening all necessary streams.
717 */
718static int start_kernel_session(struct ltt_kernel_session *ksess, int wpipe)
719{
720 int ret;
721 struct ltt_kernel_channel *kchan;
722
723 /* Open kernel metadata */
724 if (ksess->metadata == NULL) {
725 ret = kernel_open_metadata(ksess);
726 if (ret < 0) {
727 ret = LTTNG_ERR_KERN_META_FAIL;
728 goto error;
729 }
730 }
731
732 /* Open kernel metadata stream */
733 if (ksess->metadata_stream_fd < 0) {
734 ret = kernel_open_metadata_stream(ksess);
735 if (ret < 0) {
736 ERR("Kernel create metadata stream failed");
737 ret = LTTNG_ERR_KERN_STREAM_FAIL;
738 goto error;
739 }
740 }
741
742 /* For each channel */
743 cds_list_for_each_entry(kchan, &ksess->channel_list.head, list) {
744 if (kchan->stream_count == 0) {
745 ret = kernel_open_channel_stream(kchan);
746 if (ret < 0) {
747 ret = LTTNG_ERR_KERN_STREAM_FAIL;
748 goto error;
749 }
750 /* Update the stream global counter */
751 ksess->stream_count_global += ret;
752 }
753 }
754
755 /* Setup kernel consumer socket and send fds to it */
756 ret = init_kernel_tracing(ksess);
e43c41c5 757 if (ret != 0) {
9b6c7ec5
DG
758 ret = LTTNG_ERR_KERN_START_FAIL;
759 goto error;
760 }
761
762 /* This start the kernel tracing */
763 ret = kernel_start_session(ksess);
764 if (ret < 0) {
765 ret = LTTNG_ERR_KERN_START_FAIL;
766 goto error;
767 }
768
769 /* Quiescent wait after starting trace */
784303b0 770 kernel_wait_quiescent(kernel_tracer_fd);
9b6c7ec5
DG
771
772 ksess->started = 1;
773
774 ret = LTTNG_OK;
775
776error:
777 return ret;
778}
779
2f77fc4b
DG
780/*
781 * Command LTTNG_DISABLE_CHANNEL processed by the client thread.
782 */
783int cmd_disable_channel(struct ltt_session *session, int domain,
784 char *channel_name)
785{
786 int ret;
787 struct ltt_ust_session *usess;
788
789 usess = session->ust_session;
790
2223c96f
DG
791 rcu_read_lock();
792
2f77fc4b
DG
793 switch (domain) {
794 case LTTNG_DOMAIN_KERNEL:
795 {
796 ret = channel_kernel_disable(session->kernel_session,
797 channel_name);
f73fabfd 798 if (ret != LTTNG_OK) {
2f77fc4b
DG
799 goto error;
800 }
801
802 kernel_wait_quiescent(kernel_tracer_fd);
803 break;
804 }
805 case LTTNG_DOMAIN_UST:
806 {
807 struct ltt_ust_channel *uchan;
808 struct lttng_ht *chan_ht;
809
810 chan_ht = usess->domain_global.channels;
811
812 uchan = trace_ust_find_channel_by_name(chan_ht, channel_name);
813 if (uchan == NULL) {
f73fabfd 814 ret = LTTNG_ERR_UST_CHAN_NOT_FOUND;
2f77fc4b
DG
815 goto error;
816 }
817
7972aab2 818 ret = channel_ust_disable(usess, uchan);
f73fabfd 819 if (ret != LTTNG_OK) {
2f77fc4b
DG
820 goto error;
821 }
822 break;
823 }
824#if 0
825 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
826 case LTTNG_DOMAIN_UST_EXEC_NAME:
827 case LTTNG_DOMAIN_UST_PID:
828#endif
829 default:
f73fabfd 830 ret = LTTNG_ERR_UNKNOWN_DOMAIN;
2f77fc4b
DG
831 goto error;
832 }
833
f73fabfd 834 ret = LTTNG_OK;
2f77fc4b
DG
835
836error:
2223c96f 837 rcu_read_unlock();
2f77fc4b
DG
838 return ret;
839}
840
841/*
842 * Command LTTNG_ENABLE_CHANNEL processed by the client thread.
843 *
844 * The wpipe arguments is used as a notifier for the kernel thread.
845 */
846int cmd_enable_channel(struct ltt_session *session,
7972aab2 847 struct lttng_domain *domain, struct lttng_channel *attr, int wpipe)
2f77fc4b
DG
848{
849 int ret;
850 struct ltt_ust_session *usess = session->ust_session;
851 struct lttng_ht *chan_ht;
852
853 assert(session);
854 assert(attr);
7972aab2 855 assert(domain);
2f77fc4b
DG
856
857 DBG("Enabling channel %s for session %s", attr->name, session->name);
858
2223c96f
DG
859 rcu_read_lock();
860
7972aab2 861 switch (domain->type) {
2f77fc4b
DG
862 case LTTNG_DOMAIN_KERNEL:
863 {
864 struct ltt_kernel_channel *kchan;
865
2f77fc4b
DG
866 kchan = trace_kernel_get_channel_by_name(attr->name,
867 session->kernel_session);
868 if (kchan == NULL) {
869 ret = channel_kernel_create(session->kernel_session, attr, wpipe);
870 } else {
871 ret = channel_kernel_enable(session->kernel_session, kchan);
872 }
873
f73fabfd 874 if (ret != LTTNG_OK) {
2f77fc4b
DG
875 goto error;
876 }
877
784303b0 878 kernel_wait_quiescent(kernel_tracer_fd);
9b6c7ec5
DG
879
880 /*
881 * If the session was previously started, start as well this newly
882 * created kernel session so the events/channels enabled *after* the
883 * start actually work.
884 */
885 if (session->started && !session->kernel_session->started) {
886 ret = start_kernel_session(session->kernel_session, wpipe);
887 if (ret != LTTNG_OK) {
888 goto error;
889 }
890 }
2f77fc4b
DG
891 break;
892 }
893 case LTTNG_DOMAIN_UST:
894 {
895 struct ltt_ust_channel *uchan;
896
897 chan_ht = usess->domain_global.channels;
898
899 uchan = trace_ust_find_channel_by_name(chan_ht, attr->name);
900 if (uchan == NULL) {
7972aab2 901 ret = channel_ust_create(usess, attr, domain->buf_type);
2f77fc4b 902 } else {
7972aab2 903 ret = channel_ust_enable(usess, uchan);
2f77fc4b 904 }
9b6c7ec5
DG
905
906 /* Start the UST session if the session was already started. */
907 if (session->started && !usess->start_trace) {
908 ret = ust_app_start_trace_all(usess);
909 if (ret < 0) {
910 ret = LTTNG_ERR_UST_START_FAIL;
911 goto error;
912 }
913 ret = LTTNG_OK;
914 usess->start_trace = 1;
915 }
2f77fc4b
DG
916 break;
917 }
2f77fc4b 918 default:
f73fabfd 919 ret = LTTNG_ERR_UNKNOWN_DOMAIN;
2f77fc4b
DG
920 goto error;
921 }
922
923error:
2223c96f 924 rcu_read_unlock();
2f77fc4b
DG
925 return ret;
926}
927
928
929/*
930 * Command LTTNG_DISABLE_EVENT processed by the client thread.
931 */
932int cmd_disable_event(struct ltt_session *session, int domain,
933 char *channel_name, char *event_name)
934{
935 int ret;
936
2223c96f
DG
937 rcu_read_lock();
938
2f77fc4b
DG
939 switch (domain) {
940 case LTTNG_DOMAIN_KERNEL:
941 {
942 struct ltt_kernel_channel *kchan;
943 struct ltt_kernel_session *ksess;
944
945 ksess = session->kernel_session;
946
947 kchan = trace_kernel_get_channel_by_name(channel_name, ksess);
948 if (kchan == NULL) {
f73fabfd 949 ret = LTTNG_ERR_KERN_CHAN_NOT_FOUND;
2f77fc4b
DG
950 goto error;
951 }
952
d3a56674 953 ret = event_kernel_disable_tracepoint(kchan, event_name);
f73fabfd 954 if (ret != LTTNG_OK) {
2f77fc4b
DG
955 goto error;
956 }
957
958 kernel_wait_quiescent(kernel_tracer_fd);
959 break;
960 }
961 case LTTNG_DOMAIN_UST:
962 {
963 struct ltt_ust_channel *uchan;
964 struct ltt_ust_session *usess;
965
966 usess = session->ust_session;
967
968 uchan = trace_ust_find_channel_by_name(usess->domain_global.channels,
969 channel_name);
970 if (uchan == NULL) {
f73fabfd 971 ret = LTTNG_ERR_UST_CHAN_NOT_FOUND;
2f77fc4b
DG
972 goto error;
973 }
974
7972aab2 975 ret = event_ust_disable_tracepoint(usess, uchan, event_name);
f73fabfd 976 if (ret != LTTNG_OK) {
2f77fc4b
DG
977 goto error;
978 }
979
980 DBG3("Disable UST event %s in channel %s completed", event_name,
981 channel_name);
982 break;
983 }
984#if 0
985 case LTTNG_DOMAIN_UST_EXEC_NAME:
986 case LTTNG_DOMAIN_UST_PID:
987 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
988#endif
989 default:
f73fabfd 990 ret = LTTNG_ERR_UND;
2f77fc4b
DG
991 goto error;
992 }
993
f73fabfd 994 ret = LTTNG_OK;
2f77fc4b
DG
995
996error:
2223c96f 997 rcu_read_unlock();
2f77fc4b
DG
998 return ret;
999}
1000
1001/*
1002 * Command LTTNG_DISABLE_ALL_EVENT processed by the client thread.
1003 */
1004int cmd_disable_event_all(struct ltt_session *session, int domain,
1005 char *channel_name)
1006{
1007 int ret;
1008
2223c96f
DG
1009 rcu_read_lock();
1010
2f77fc4b
DG
1011 switch (domain) {
1012 case LTTNG_DOMAIN_KERNEL:
1013 {
1014 struct ltt_kernel_session *ksess;
1015 struct ltt_kernel_channel *kchan;
1016
1017 ksess = session->kernel_session;
1018
1019 kchan = trace_kernel_get_channel_by_name(channel_name, ksess);
1020 if (kchan == NULL) {
f73fabfd 1021 ret = LTTNG_ERR_KERN_CHAN_NOT_FOUND;
2f77fc4b
DG
1022 goto error;
1023 }
1024
d3a56674 1025 ret = event_kernel_disable_all(kchan);
f73fabfd 1026 if (ret != LTTNG_OK) {
2f77fc4b
DG
1027 goto error;
1028 }
1029
1030 kernel_wait_quiescent(kernel_tracer_fd);
1031 break;
1032 }
1033 case LTTNG_DOMAIN_UST:
1034 {
1035 struct ltt_ust_session *usess;
1036 struct ltt_ust_channel *uchan;
1037
1038 usess = session->ust_session;
1039
1040 uchan = trace_ust_find_channel_by_name(usess->domain_global.channels,
1041 channel_name);
1042 if (uchan == NULL) {
f73fabfd 1043 ret = LTTNG_ERR_UST_CHAN_NOT_FOUND;
2f77fc4b
DG
1044 goto error;
1045 }
1046
7972aab2 1047 ret = event_ust_disable_all_tracepoints(usess, uchan);
2f77fc4b
DG
1048 if (ret != 0) {
1049 goto error;
1050 }
1051
1052 DBG3("Disable all UST events in channel %s completed", channel_name);
1053
1054 break;
1055 }
1056#if 0
1057 case LTTNG_DOMAIN_UST_EXEC_NAME:
1058 case LTTNG_DOMAIN_UST_PID:
1059 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
1060#endif
1061 default:
f73fabfd 1062 ret = LTTNG_ERR_UND;
2f77fc4b
DG
1063 goto error;
1064 }
1065
f73fabfd 1066 ret = LTTNG_OK;
2f77fc4b
DG
1067
1068error:
2223c96f 1069 rcu_read_unlock();
2f77fc4b
DG
1070 return ret;
1071}
1072
1073/*
1074 * Command LTTNG_ADD_CONTEXT processed by the client thread.
1075 */
1076int cmd_add_context(struct ltt_session *session, int domain,
601d5acf 1077 char *channel_name, struct lttng_event_context *ctx, int kwpipe)
2f77fc4b
DG
1078{
1079 int ret;
1080
1081 switch (domain) {
1082 case LTTNG_DOMAIN_KERNEL:
979e618e
DG
1083 assert(session->kernel_session);
1084
1085 if (session->kernel_session->channel_count == 0) {
1086 /* Create default channel */
1087 ret = channel_kernel_create(session->kernel_session, NULL, kwpipe);
1088 if (ret != LTTNG_OK) {
1089 goto error;
1090 }
1091 }
1092
2f77fc4b 1093 /* Add kernel context to kernel tracer */
601d5acf 1094 ret = context_kernel_add(session->kernel_session, ctx, channel_name);
f73fabfd 1095 if (ret != LTTNG_OK) {
2f77fc4b
DG
1096 goto error;
1097 }
1098 break;
1099 case LTTNG_DOMAIN_UST:
1100 {
1101 struct ltt_ust_session *usess = session->ust_session;
2f77fc4b
DG
1102 assert(usess);
1103
979e618e
DG
1104 unsigned int chan_count =
1105 lttng_ht_get_count(usess->domain_global.channels);
1106 if (chan_count == 0) {
1107 struct lttng_channel *attr;
1108 /* Create default channel */
0a9c6494 1109 attr = channel_new_default_attr(domain, usess->buffer_type);
979e618e
DG
1110 if (attr == NULL) {
1111 ret = LTTNG_ERR_FATAL;
1112 goto error;
1113 }
1114
7972aab2 1115 ret = channel_ust_create(usess, attr, usess->buffer_type);
979e618e
DG
1116 if (ret != LTTNG_OK) {
1117 free(attr);
1118 goto error;
1119 }
1120 free(attr);
1121 }
1122
601d5acf 1123 ret = context_ust_add(usess, domain, ctx, channel_name);
f73fabfd 1124 if (ret != LTTNG_OK) {
2f77fc4b
DG
1125 goto error;
1126 }
1127 break;
1128 }
1129#if 0
1130 case LTTNG_DOMAIN_UST_EXEC_NAME:
1131 case LTTNG_DOMAIN_UST_PID:
1132 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
1133#endif
1134 default:
f73fabfd 1135 ret = LTTNG_ERR_UND;
2f77fc4b
DG
1136 goto error;
1137 }
1138
f73fabfd 1139 ret = LTTNG_OK;
2f77fc4b
DG
1140
1141error:
1142 return ret;
1143}
1144
2f77fc4b
DG
1145/*
1146 * Command LTTNG_ENABLE_EVENT processed by the client thread.
1147 */
7972aab2 1148int cmd_enable_event(struct ltt_session *session, struct lttng_domain *domain,
025faf73
DG
1149 char *channel_name, struct lttng_event *event,
1150 struct lttng_filter_bytecode *filter, int wpipe)
2f77fc4b 1151{
e5f5db7f 1152 int ret, channel_created = 0;
2f77fc4b
DG
1153 struct lttng_channel *attr;
1154
1155 assert(session);
1156 assert(event);
1157 assert(channel_name);
1158
2223c96f
DG
1159 rcu_read_lock();
1160
7972aab2 1161 switch (domain->type) {
2f77fc4b
DG
1162 case LTTNG_DOMAIN_KERNEL:
1163 {
1164 struct ltt_kernel_channel *kchan;
1165
1166 kchan = trace_kernel_get_channel_by_name(channel_name,
1167 session->kernel_session);
1168 if (kchan == NULL) {
0a9c6494
DG
1169 attr = channel_new_default_attr(LTTNG_DOMAIN_KERNEL,
1170 LTTNG_BUFFER_GLOBAL);
2f77fc4b 1171 if (attr == NULL) {
f73fabfd 1172 ret = LTTNG_ERR_FATAL;
2f77fc4b
DG
1173 goto error;
1174 }
1175 strncpy(attr->name, channel_name, sizeof(attr->name));
1176
1177 ret = cmd_enable_channel(session, domain, attr, wpipe);
f73fabfd 1178 if (ret != LTTNG_OK) {
2f77fc4b
DG
1179 free(attr);
1180 goto error;
1181 }
1182 free(attr);
e5f5db7f
DG
1183
1184 channel_created = 1;
2f77fc4b
DG
1185 }
1186
1187 /* Get the newly created kernel channel pointer */
1188 kchan = trace_kernel_get_channel_by_name(channel_name,
1189 session->kernel_session);
1190 if (kchan == NULL) {
1191 /* This sould not happen... */
f73fabfd 1192 ret = LTTNG_ERR_FATAL;
2f77fc4b
DG
1193 goto error;
1194 }
1195
d3a56674 1196 ret = event_kernel_enable_tracepoint(kchan, event);
f73fabfd 1197 if (ret != LTTNG_OK) {
e5f5db7f
DG
1198 if (channel_created) {
1199 /* Let's not leak a useless channel. */
1200 kernel_destroy_channel(kchan);
1201 }
2f77fc4b
DG
1202 goto error;
1203 }
1204
1205 kernel_wait_quiescent(kernel_tracer_fd);
1206 break;
1207 }
1208 case LTTNG_DOMAIN_UST:
1209 {
1210 struct ltt_ust_channel *uchan;
1211 struct ltt_ust_session *usess = session->ust_session;
1212
1213 assert(usess);
1214
1215 /* Get channel from global UST domain */
1216 uchan = trace_ust_find_channel_by_name(usess->domain_global.channels,
1217 channel_name);
1218 if (uchan == NULL) {
1219 /* Create default channel */
0a9c6494
DG
1220 attr = channel_new_default_attr(LTTNG_DOMAIN_UST,
1221 usess->buffer_type);
2f77fc4b 1222 if (attr == NULL) {
f73fabfd 1223 ret = LTTNG_ERR_FATAL;
2f77fc4b
DG
1224 goto error;
1225 }
1226 strncpy(attr->name, channel_name, sizeof(attr->name));
1227
1228 ret = cmd_enable_channel(session, domain, attr, wpipe);
f73fabfd 1229 if (ret != LTTNG_OK) {
2f77fc4b
DG
1230 free(attr);
1231 goto error;
1232 }
1233 free(attr);
1234
1235 /* Get the newly created channel reference back */
1236 uchan = trace_ust_find_channel_by_name(
1237 usess->domain_global.channels, channel_name);
1238 assert(uchan);
1239 }
1240
1241 /* At this point, the session and channel exist on the tracer */
7972aab2 1242 ret = event_ust_enable_tracepoint(usess, uchan, event, filter);
f73fabfd 1243 if (ret != LTTNG_OK) {
2f77fc4b
DG
1244 goto error;
1245 }
1246 break;
1247 }
1248#if 0
1249 case LTTNG_DOMAIN_UST_EXEC_NAME:
1250 case LTTNG_DOMAIN_UST_PID:
1251 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
1252#endif
1253 default:
f73fabfd 1254 ret = LTTNG_ERR_UND;
2f77fc4b
DG
1255 goto error;
1256 }
1257
f73fabfd 1258 ret = LTTNG_OK;
2f77fc4b
DG
1259
1260error:
2223c96f 1261 rcu_read_unlock();
2f77fc4b
DG
1262 return ret;
1263}
1264
1265/*
1266 * Command LTTNG_ENABLE_ALL_EVENT processed by the client thread.
1267 */
7972aab2
DG
1268int cmd_enable_event_all(struct ltt_session *session,
1269 struct lttng_domain *domain, char *channel_name, int event_type,
025faf73 1270 struct lttng_filter_bytecode *filter, int wpipe)
2f77fc4b
DG
1271{
1272 int ret;
1273 struct lttng_channel *attr;
1274
1275 assert(session);
1276 assert(channel_name);
1277
2223c96f
DG
1278 rcu_read_lock();
1279
7972aab2 1280 switch (domain->type) {
2f77fc4b
DG
1281 case LTTNG_DOMAIN_KERNEL:
1282 {
1283 struct ltt_kernel_channel *kchan;
1284
1285 assert(session->kernel_session);
1286
1287 kchan = trace_kernel_get_channel_by_name(channel_name,
1288 session->kernel_session);
1289 if (kchan == NULL) {
1290 /* Create default channel */
0a9c6494
DG
1291 attr = channel_new_default_attr(LTTNG_DOMAIN_KERNEL,
1292 LTTNG_BUFFER_GLOBAL);
2f77fc4b 1293 if (attr == NULL) {
f73fabfd 1294 ret = LTTNG_ERR_FATAL;
2f77fc4b
DG
1295 goto error;
1296 }
1297 strncpy(attr->name, channel_name, sizeof(attr->name));
1298
1299 ret = cmd_enable_channel(session, domain, attr, wpipe);
f73fabfd 1300 if (ret != LTTNG_OK) {
2f77fc4b
DG
1301 free(attr);
1302 goto error;
1303 }
1304 free(attr);
1305
1306 /* Get the newly created kernel channel pointer */
1307 kchan = trace_kernel_get_channel_by_name(channel_name,
1308 session->kernel_session);
1309 assert(kchan);
1310 }
1311
1312 switch (event_type) {
1313 case LTTNG_EVENT_SYSCALL:
d3a56674 1314 ret = event_kernel_enable_all_syscalls(kchan, kernel_tracer_fd);
2f77fc4b
DG
1315 break;
1316 case LTTNG_EVENT_TRACEPOINT:
1317 /*
1318 * This call enables all LTTNG_KERNEL_TRACEPOINTS and
1319 * events already registered to the channel.
1320 */
d3a56674 1321 ret = event_kernel_enable_all_tracepoints(kchan, kernel_tracer_fd);
2f77fc4b
DG
1322 break;
1323 case LTTNG_EVENT_ALL:
1324 /* Enable syscalls and tracepoints */
d3a56674 1325 ret = event_kernel_enable_all(kchan, kernel_tracer_fd);
2f77fc4b
DG
1326 break;
1327 default:
f73fabfd 1328 ret = LTTNG_ERR_KERN_ENABLE_FAIL;
2f77fc4b
DG
1329 goto error;
1330 }
1331
1332 /* Manage return value */
f73fabfd 1333 if (ret != LTTNG_OK) {
e5f5db7f
DG
1334 /*
1335 * On error, cmd_enable_channel call will take care of destroying
1336 * the created channel if it was needed.
1337 */
2f77fc4b
DG
1338 goto error;
1339 }
1340
1341 kernel_wait_quiescent(kernel_tracer_fd);
1342 break;
1343 }
1344 case LTTNG_DOMAIN_UST:
1345 {
1346 struct ltt_ust_channel *uchan;
1347 struct ltt_ust_session *usess = session->ust_session;
1348
1349 assert(usess);
1350
1351 /* Get channel from global UST domain */
1352 uchan = trace_ust_find_channel_by_name(usess->domain_global.channels,
1353 channel_name);
1354 if (uchan == NULL) {
1355 /* Create default channel */
0a9c6494
DG
1356 attr = channel_new_default_attr(LTTNG_DOMAIN_UST,
1357 usess->buffer_type);
2f77fc4b 1358 if (attr == NULL) {
f73fabfd 1359 ret = LTTNG_ERR_FATAL;
2f77fc4b
DG
1360 goto error;
1361 }
1362 strncpy(attr->name, channel_name, sizeof(attr->name));
1363
1364 ret = cmd_enable_channel(session, domain, attr, wpipe);
f73fabfd 1365 if (ret != LTTNG_OK) {
2f77fc4b
DG
1366 free(attr);
1367 goto error;
1368 }
1369 free(attr);
1370
1371 /* Get the newly created channel reference back */
1372 uchan = trace_ust_find_channel_by_name(
1373 usess->domain_global.channels, channel_name);
1374 assert(uchan);
1375 }
1376
1377 /* At this point, the session and channel exist on the tracer */
1378
1379 switch (event_type) {
1380 case LTTNG_EVENT_ALL:
1381 case LTTNG_EVENT_TRACEPOINT:
7972aab2 1382 ret = event_ust_enable_all_tracepoints(usess, uchan, filter);
f73fabfd 1383 if (ret != LTTNG_OK) {
2f77fc4b
DG
1384 goto error;
1385 }
1386 break;
1387 default:
f73fabfd 1388 ret = LTTNG_ERR_UST_ENABLE_FAIL;
2f77fc4b
DG
1389 goto error;
1390 }
1391
1392 /* Manage return value */
f73fabfd 1393 if (ret != LTTNG_OK) {
2f77fc4b
DG
1394 goto error;
1395 }
1396
1397 break;
1398 }
1399#if 0
1400 case LTTNG_DOMAIN_UST_EXEC_NAME:
1401 case LTTNG_DOMAIN_UST_PID:
1402 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
1403#endif
1404 default:
f73fabfd 1405 ret = LTTNG_ERR_UND;
2f77fc4b
DG
1406 goto error;
1407 }
1408
f73fabfd 1409 ret = LTTNG_OK;
2f77fc4b
DG
1410
1411error:
2223c96f 1412 rcu_read_unlock();
2f77fc4b
DG
1413 return ret;
1414}
1415
1416
1417/*
1418 * Command LTTNG_LIST_TRACEPOINTS processed by the client thread.
1419 */
1420ssize_t cmd_list_tracepoints(int domain, struct lttng_event **events)
1421{
1422 int ret;
1423 ssize_t nb_events = 0;
1424
1425 switch (domain) {
1426 case LTTNG_DOMAIN_KERNEL:
1427 nb_events = kernel_list_events(kernel_tracer_fd, events);
1428 if (nb_events < 0) {
f73fabfd 1429 ret = LTTNG_ERR_KERN_LIST_FAIL;
2f77fc4b
DG
1430 goto error;
1431 }
1432 break;
1433 case LTTNG_DOMAIN_UST:
1434 nb_events = ust_app_list_events(events);
1435 if (nb_events < 0) {
f73fabfd 1436 ret = LTTNG_ERR_UST_LIST_FAIL;
2f77fc4b
DG
1437 goto error;
1438 }
1439 break;
1440 default:
f73fabfd 1441 ret = LTTNG_ERR_UND;
2f77fc4b
DG
1442 goto error;
1443 }
1444
1445 return nb_events;
1446
1447error:
1448 /* Return negative value to differentiate return code */
1449 return -ret;
1450}
1451
1452/*
1453 * Command LTTNG_LIST_TRACEPOINT_FIELDS processed by the client thread.
1454 */
1455ssize_t cmd_list_tracepoint_fields(int domain,
1456 struct lttng_event_field **fields)
1457{
1458 int ret;
1459 ssize_t nb_fields = 0;
1460
1461 switch (domain) {
1462 case LTTNG_DOMAIN_UST:
1463 nb_fields = ust_app_list_event_fields(fields);
1464 if (nb_fields < 0) {
f73fabfd 1465 ret = LTTNG_ERR_UST_LIST_FAIL;
2f77fc4b
DG
1466 goto error;
1467 }
1468 break;
1469 case LTTNG_DOMAIN_KERNEL:
1470 default: /* fall-through */
f73fabfd 1471 ret = LTTNG_ERR_UND;
2f77fc4b
DG
1472 goto error;
1473 }
1474
1475 return nb_fields;
1476
1477error:
1478 /* Return negative value to differentiate return code */
1479 return -ret;
1480}
1481
1482/*
1483 * Command LTTNG_START_TRACE processed by the client thread.
1484 */
1485int cmd_start_trace(struct ltt_session *session)
1486{
1487 int ret;
1488 struct ltt_kernel_session *ksession;
1489 struct ltt_ust_session *usess;
2f77fc4b
DG
1490
1491 assert(session);
1492
1493 /* Ease our life a bit ;) */
1494 ksession = session->kernel_session;
1495 usess = session->ust_session;
1496
1497 if (session->enabled) {
1498 /* Already started. */
f73fabfd 1499 ret = LTTNG_ERR_TRACE_ALREADY_STARTED;
2f77fc4b
DG
1500 goto error;
1501 }
1502
1503 session->enabled = 1;
1504
2f77fc4b
DG
1505 /* Kernel tracing */
1506 if (ksession != NULL) {
9b6c7ec5
DG
1507 ret = start_kernel_session(ksession, kernel_tracer_fd);
1508 if (ret != LTTNG_OK) {
2f77fc4b
DG
1509 goto error;
1510 }
2f77fc4b
DG
1511 }
1512
1513 /* Flag session that trace should start automatically */
1514 if (usess) {
1515 usess->start_trace = 1;
1516
1517 ret = ust_app_start_trace_all(usess);
1518 if (ret < 0) {
f73fabfd 1519 ret = LTTNG_ERR_UST_START_FAIL;
2f77fc4b
DG
1520 goto error;
1521 }
1522 }
1523
9b6c7ec5
DG
1524 session->started = 1;
1525
f73fabfd 1526 ret = LTTNG_OK;
2f77fc4b
DG
1527
1528error:
1529 return ret;
1530}
1531
1532/*
1533 * Command LTTNG_STOP_TRACE processed by the client thread.
1534 */
1535int cmd_stop_trace(struct ltt_session *session)
1536{
1537 int ret;
1538 struct ltt_kernel_channel *kchan;
1539 struct ltt_kernel_session *ksession;
1540 struct ltt_ust_session *usess;
1541
1542 assert(session);
1543
1544 /* Short cut */
1545 ksession = session->kernel_session;
1546 usess = session->ust_session;
1547
1548 if (!session->enabled) {
f73fabfd 1549 ret = LTTNG_ERR_TRACE_ALREADY_STOPPED;
2f77fc4b
DG
1550 goto error;
1551 }
1552
1553 session->enabled = 0;
1554
1555 /* Kernel tracer */
d39829a1 1556 if (ksession && ksession->started) {
2f77fc4b
DG
1557 DBG("Stop kernel tracing");
1558
1559 /* Flush metadata if exist */
1560 if (ksession->metadata_stream_fd >= 0) {
1561 ret = kernel_metadata_flush_buffer(ksession->metadata_stream_fd);
1562 if (ret < 0) {
1563 ERR("Kernel metadata flush failed");
1564 }
1565 }
1566
1567 /* Flush all buffers before stopping */
1568 cds_list_for_each_entry(kchan, &ksession->channel_list.head, list) {
1569 ret = kernel_flush_buffer(kchan);
1570 if (ret < 0) {
1571 ERR("Kernel flush buffer error");
1572 }
1573 }
1574
1575 ret = kernel_stop_session(ksession);
1576 if (ret < 0) {
f73fabfd 1577 ret = LTTNG_ERR_KERN_STOP_FAIL;
2f77fc4b
DG
1578 goto error;
1579 }
1580
1581 kernel_wait_quiescent(kernel_tracer_fd);
9b6c7ec5
DG
1582
1583 ksession->started = 0;
2f77fc4b
DG
1584 }
1585
d39829a1 1586 if (usess && usess->start_trace) {
2f77fc4b
DG
1587 usess->start_trace = 0;
1588
1589 ret = ust_app_stop_trace_all(usess);
1590 if (ret < 0) {
f73fabfd 1591 ret = LTTNG_ERR_UST_STOP_FAIL;
2f77fc4b
DG
1592 goto error;
1593 }
1594 }
1595
9b6c7ec5
DG
1596 session->started = 0;
1597
f73fabfd 1598 ret = LTTNG_OK;
2f77fc4b
DG
1599
1600error:
1601 return ret;
1602}
1603
1604/*
1605 * Command LTTNG_SET_CONSUMER_URI processed by the client thread.
1606 */
1607int cmd_set_consumer_uri(int domain, struct ltt_session *session,
1608 size_t nb_uri, struct lttng_uri *uris)
1609{
1610 int ret, i;
1611 struct ltt_kernel_session *ksess = session->kernel_session;
1612 struct ltt_ust_session *usess = session->ust_session;
1613 struct consumer_output *consumer = NULL;
1614
1615 assert(session);
1616 assert(uris);
1617 assert(nb_uri > 0);
1618
1619 /* Can't enable consumer after session started. */
1620 if (session->enabled) {
f73fabfd 1621 ret = LTTNG_ERR_TRACE_ALREADY_STARTED;
2f77fc4b
DG
1622 goto error;
1623 }
1624
2f77fc4b
DG
1625 /*
1626 * This case switch makes sure the domain session has a temporary consumer
1627 * so the URL can be set.
1628 */
1629 switch (domain) {
1630 case 0:
1631 /* Code flow error. A session MUST always have a consumer object */
1632 assert(session->consumer);
1633 /*
1634 * The URL will be added to the tracing session consumer instead of a
1635 * specific domain consumer.
1636 */
1637 consumer = session->consumer;
1638 break;
1639 case LTTNG_DOMAIN_KERNEL:
1640 /* Code flow error if we don't have a kernel session here. */
1641 assert(ksess);
785d2d0d
DG
1642 assert(ksess->consumer);
1643 consumer = ksess->consumer;
2f77fc4b
DG
1644 break;
1645 case LTTNG_DOMAIN_UST:
1646 /* Code flow error if we don't have a kernel session here. */
1647 assert(usess);
785d2d0d
DG
1648 assert(usess->consumer);
1649 consumer = usess->consumer;
2f77fc4b
DG
1650 break;
1651 }
1652
1653 for (i = 0; i < nb_uri; i++) {
2f77fc4b 1654 ret = add_uri_to_consumer(consumer, &uris[i], domain, session->name);
a74934ba 1655 if (ret != LTTNG_OK) {
2f77fc4b
DG
1656 goto error;
1657 }
2f77fc4b
DG
1658 }
1659
1660 /* All good! */
f73fabfd 1661 ret = LTTNG_OK;
2f77fc4b
DG
1662
1663error:
1664 return ret;
1665}
1666
1667/*
1668 * Command LTTNG_CREATE_SESSION processed by the client thread.
1669 */
1670int cmd_create_session_uri(char *name, struct lttng_uri *uris,
1671 size_t nb_uri, lttng_sock_cred *creds)
1672{
1673 int ret;
2f77fc4b
DG
1674 struct ltt_session *session;
1675
1676 assert(name);
1677
785d2d0d
DG
1678 /* No URIs is not possible. */
1679 if (uris == NULL) {
1680 ret = LTTNG_ERR_SESSION_FAIL;
1681 goto session_error;
1682 }
1683
2f77fc4b
DG
1684 /*
1685 * Verify if the session already exist
1686 *
1687 * XXX: There is no need for the session lock list here since the caller
1688 * (process_client_msg) is holding it. We might want to change that so a
1689 * single command does not lock the entire session list.
1690 */
1691 session = session_find_by_name(name);
1692 if (session != NULL) {
f73fabfd 1693 ret = LTTNG_ERR_EXIST_SESS;
2f77fc4b
DG
1694 goto find_error;
1695 }
1696
1697 /* Create tracing session in the registry */
dec56f6c 1698 ret = session_create(name, LTTNG_SOCK_GET_UID_CRED(creds),
2f77fc4b 1699 LTTNG_SOCK_GET_GID_CRED(creds));
f73fabfd 1700 if (ret != LTTNG_OK) {
2f77fc4b
DG
1701 goto session_error;
1702 }
1703
1704 /*
1705 * Get the newly created session pointer back
1706 *
1707 * XXX: There is no need for the session lock list here since the caller
1708 * (process_client_msg) is holding it. We might want to change that so a
1709 * single command does not lock the entire session list.
1710 */
1711 session = session_find_by_name(name);
1712 assert(session);
1713
1714 /* Create default consumer output for the session not yet created. */
1715 session->consumer = consumer_create_output(CONSUMER_DST_LOCAL);
1716 if (session->consumer == NULL) {
f73fabfd 1717 ret = LTTNG_ERR_FATAL;
2f77fc4b
DG
1718 goto consumer_error;
1719 }
1720
2f77fc4b 1721 ret = cmd_set_consumer_uri(0, session, nb_uri, uris);
f73fabfd 1722 if (ret != LTTNG_OK) {
2f77fc4b
DG
1723 goto consumer_error;
1724 }
1725
1726 session->consumer->enabled = 1;
1727
f73fabfd 1728 return LTTNG_OK;
2f77fc4b
DG
1729
1730consumer_error:
1731 session_destroy(session);
1732session_error:
1733find_error:
1734 return ret;
1735}
1736
1737/*
1738 * Command LTTNG_DESTROY_SESSION processed by the client thread.
1739 */
1740int cmd_destroy_session(struct ltt_session *session, int wpipe)
1741{
1742 int ret;
1743 struct ltt_ust_session *usess;
1744 struct ltt_kernel_session *ksess;
1745
1746 /* Safety net */
1747 assert(session);
1748
1749 usess = session->ust_session;
1750 ksess = session->kernel_session;
1751
1752 /* Clean kernel session teardown */
1753 kernel_destroy_session(ksess);
1754
1755 /* UST session teardown */
1756 if (usess) {
1757 /* Close any relayd session */
1758 consumer_output_send_destroy_relayd(usess->consumer);
1759
1760 /* Destroy every UST application related to this session. */
1761 ret = ust_app_destroy_trace_all(usess);
1762 if (ret) {
1763 ERR("Error in ust_app_destroy_trace_all");
1764 }
1765
1766 /* Clean up the rest. */
1767 trace_ust_destroy_session(usess);
1768 }
1769
1770 /*
1771 * Must notify the kernel thread here to update it's poll set in order to
1772 * remove the channel(s)' fd just destroyed.
1773 */
1774 ret = notify_thread_pipe(wpipe);
1775 if (ret < 0) {
1776 PERROR("write kernel poll pipe");
1777 }
1778
1779 ret = session_destroy(session);
1780
1781 return ret;
1782}
1783
1784/*
1785 * Command LTTNG_CALIBRATE processed by the client thread.
1786 */
1787int cmd_calibrate(int domain, struct lttng_calibrate *calibrate)
1788{
1789 int ret;
1790
1791 switch (domain) {
1792 case LTTNG_DOMAIN_KERNEL:
1793 {
1794 struct lttng_kernel_calibrate kcalibrate;
1795
1796 kcalibrate.type = calibrate->type;
1797 ret = kernel_calibrate(kernel_tracer_fd, &kcalibrate);
1798 if (ret < 0) {
f73fabfd 1799 ret = LTTNG_ERR_KERN_ENABLE_FAIL;
2f77fc4b
DG
1800 goto error;
1801 }
1802 break;
1803 }
1804 case LTTNG_DOMAIN_UST:
1805 {
1806 struct lttng_ust_calibrate ucalibrate;
1807
1808 ucalibrate.type = calibrate->type;
1809 ret = ust_app_calibrate_glb(&ucalibrate);
1810 if (ret < 0) {
f73fabfd 1811 ret = LTTNG_ERR_UST_CALIBRATE_FAIL;
2f77fc4b
DG
1812 goto error;
1813 }
1814 break;
1815 }
1816 default:
f73fabfd 1817 ret = LTTNG_ERR_UND;
2f77fc4b
DG
1818 goto error;
1819 }
1820
f73fabfd 1821 ret = LTTNG_OK;
2f77fc4b
DG
1822
1823error:
1824 return ret;
1825}
1826
1827/*
1828 * Command LTTNG_REGISTER_CONSUMER processed by the client thread.
1829 */
1830int cmd_register_consumer(struct ltt_session *session, int domain,
1831 const char *sock_path, struct consumer_data *cdata)
1832{
1833 int ret, sock;
dd81b457 1834 struct consumer_socket *socket = NULL;
2f77fc4b
DG
1835
1836 assert(session);
1837 assert(cdata);
1838 assert(sock_path);
1839
1840 switch (domain) {
1841 case LTTNG_DOMAIN_KERNEL:
1842 {
1843 struct ltt_kernel_session *ksess = session->kernel_session;
1844
1845 assert(ksess);
1846
1847 /* Can't register a consumer if there is already one */
1848 if (ksess->consumer_fds_sent != 0) {
f73fabfd 1849 ret = LTTNG_ERR_KERN_CONSUMER_FAIL;
2f77fc4b
DG
1850 goto error;
1851 }
1852
1853 sock = lttcomm_connect_unix_sock(sock_path);
1854 if (sock < 0) {
f73fabfd 1855 ret = LTTNG_ERR_CONNECT_FAIL;
2f77fc4b
DG
1856 goto error;
1857 }
1858
1859 socket = consumer_allocate_socket(sock);
1860 if (socket == NULL) {
f66c074c
DG
1861 ret = close(sock);
1862 if (ret < 0) {
1863 PERROR("close register consumer");
1864 }
f73fabfd 1865 ret = LTTNG_ERR_FATAL;
2f77fc4b
DG
1866 goto error;
1867 }
1868
1869 socket->lock = zmalloc(sizeof(pthread_mutex_t));
1870 if (socket->lock == NULL) {
1871 PERROR("zmalloc pthread mutex");
f73fabfd 1872 ret = LTTNG_ERR_FATAL;
2f77fc4b
DG
1873 goto error;
1874 }
1875 pthread_mutex_init(socket->lock, NULL);
1876 socket->registered = 1;
1877
1878 rcu_read_lock();
1879 consumer_add_socket(socket, ksess->consumer);
1880 rcu_read_unlock();
1881
1882 pthread_mutex_lock(&cdata->pid_mutex);
1883 cdata->pid = -1;
1884 pthread_mutex_unlock(&cdata->pid_mutex);
1885
1886 break;
1887 }
1888 default:
1889 /* TODO: Userspace tracing */
f73fabfd 1890 ret = LTTNG_ERR_UND;
2f77fc4b
DG
1891 goto error;
1892 }
1893
dd81b457 1894 return LTTNG_OK;
2f77fc4b
DG
1895
1896error:
dd81b457
DG
1897 if (socket) {
1898 consumer_destroy_socket(socket);
1899 }
2f77fc4b
DG
1900 return ret;
1901}
1902
1903/*
1904 * Command LTTNG_LIST_DOMAINS processed by the client thread.
1905 */
1906ssize_t cmd_list_domains(struct ltt_session *session,
1907 struct lttng_domain **domains)
1908{
1909 int ret, index = 0;
1910 ssize_t nb_dom = 0;
1911
1912 if (session->kernel_session != NULL) {
1913 DBG3("Listing domains found kernel domain");
1914 nb_dom++;
1915 }
1916
1917 if (session->ust_session != NULL) {
1918 DBG3("Listing domains found UST global domain");
1919 nb_dom++;
1920 }
1921
1922 *domains = zmalloc(nb_dom * sizeof(struct lttng_domain));
1923 if (*domains == NULL) {
f73fabfd 1924 ret = LTTNG_ERR_FATAL;
2f77fc4b
DG
1925 goto error;
1926 }
1927
1928 if (session->kernel_session != NULL) {
1929 (*domains)[index].type = LTTNG_DOMAIN_KERNEL;
1930 index++;
1931 }
1932
1933 if (session->ust_session != NULL) {
1934 (*domains)[index].type = LTTNG_DOMAIN_UST;
88c5f0d8 1935 (*domains)[index].buf_type = session->ust_session->buffer_type;
2f77fc4b
DG
1936 index++;
1937 }
1938
1939 return nb_dom;
1940
1941error:
f73fabfd
DG
1942 /* Return negative value to differentiate return code */
1943 return -ret;
2f77fc4b
DG
1944}
1945
1946
1947/*
1948 * Command LTTNG_LIST_CHANNELS processed by the client thread.
1949 */
1950ssize_t cmd_list_channels(int domain, struct ltt_session *session,
1951 struct lttng_channel **channels)
1952{
1953 int ret;
1954 ssize_t nb_chan = 0;
1955
1956 switch (domain) {
1957 case LTTNG_DOMAIN_KERNEL:
1958 if (session->kernel_session != NULL) {
1959 nb_chan = session->kernel_session->channel_count;
1960 }
1961 DBG3("Number of kernel channels %zd", nb_chan);
c7d620a2
DG
1962 if (nb_chan <= 0) {
1963 ret = LTTNG_ERR_KERN_CHAN_NOT_FOUND;
1964 }
2f77fc4b
DG
1965 break;
1966 case LTTNG_DOMAIN_UST:
1967 if (session->ust_session != NULL) {
1968 nb_chan = lttng_ht_get_count(
1969 session->ust_session->domain_global.channels);
1970 }
1971 DBG3("Number of UST global channels %zd", nb_chan);
c7d620a2
DG
1972 if (nb_chan <= 0) {
1973 ret = LTTNG_ERR_UST_CHAN_NOT_FOUND;
1974 }
2f77fc4b
DG
1975 break;
1976 default:
1977 *channels = NULL;
f73fabfd 1978 ret = LTTNG_ERR_UND;
2f77fc4b
DG
1979 goto error;
1980 }
1981
1982 if (nb_chan > 0) {
1983 *channels = zmalloc(nb_chan * sizeof(struct lttng_channel));
1984 if (*channels == NULL) {
f73fabfd 1985 ret = LTTNG_ERR_FATAL;
2f77fc4b
DG
1986 goto error;
1987 }
1988
1989 list_lttng_channels(domain, session, *channels);
1990 } else {
1991 *channels = NULL;
c7d620a2
DG
1992 /* Ret value was set in the domain switch case */
1993 goto error;
2f77fc4b
DG
1994 }
1995
1996 return nb_chan;
1997
1998error:
f73fabfd
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1999 /* Return negative value to differentiate return code */
2000 return -ret;
2f77fc4b
DG
2001}
2002
2003/*
2004 * Command LTTNG_LIST_EVENTS processed by the client thread.
2005 */
2006ssize_t cmd_list_events(int domain, struct ltt_session *session,
2007 char *channel_name, struct lttng_event **events)
2008{
2009 int ret = 0;
2010 ssize_t nb_event = 0;
2011
2012 switch (domain) {
2013 case LTTNG_DOMAIN_KERNEL:
2014 if (session->kernel_session != NULL) {
2015 nb_event = list_lttng_kernel_events(channel_name,
2016 session->kernel_session, events);
2017 }
2018 break;
2019 case LTTNG_DOMAIN_UST:
2020 {
2021 if (session->ust_session != NULL) {
2022 nb_event = list_lttng_ust_global_events(channel_name,
2023 &session->ust_session->domain_global, events);
2024 }
2025 break;
2026 }
2027 default:
f73fabfd 2028 ret = LTTNG_ERR_UND;
2f77fc4b
DG
2029 goto error;
2030 }
2031
f73fabfd 2032 return nb_event;
2f77fc4b
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2033
2034error:
f73fabfd
DG
2035 /* Return negative value to differentiate return code */
2036 return -ret;
2f77fc4b
DG
2037}
2038
2039/*
2040 * Using the session list, filled a lttng_session array to send back to the
2041 * client for session listing.
2042 *
2043 * The session list lock MUST be acquired before calling this function. Use
2044 * session_lock_list() and session_unlock_list().
2045 */
2046void cmd_list_lttng_sessions(struct lttng_session *sessions, uid_t uid,
2047 gid_t gid)
2048{
2049 int ret;
2050 unsigned int i = 0;
2051 struct ltt_session *session;
2052 struct ltt_session_list *list = session_get_list();
2053
2054 DBG("Getting all available session for UID %d GID %d",
2055 uid, gid);
2056 /*
2057 * Iterate over session list and append data after the control struct in
2058 * the buffer.
2059 */
2060 cds_list_for_each_entry(session, &list->head, list) {
2061 /*
2062 * Only list the sessions the user can control.
2063 */
2064 if (!session_access_ok(session, uid, gid)) {
2065 continue;
2066 }
2067
2068 struct ltt_kernel_session *ksess = session->kernel_session;
2069 struct ltt_ust_session *usess = session->ust_session;
2070
2071 if (session->consumer->type == CONSUMER_DST_NET ||
2072 (ksess && ksess->consumer->type == CONSUMER_DST_NET) ||
2073 (usess && usess->consumer->type == CONSUMER_DST_NET)) {
2074 ret = build_network_session_path(sessions[i].path,
dec56f6c 2075 sizeof(sessions[i].path), session);
2f77fc4b 2076 } else {
dec56f6c 2077 ret = snprintf(sessions[i].path, sizeof(sessions[i].path), "%s",
2f77fc4b
DG
2078 session->consumer->dst.trace_path);
2079 }
2080 if (ret < 0) {
2081 PERROR("snprintf session path");
2082 continue;
2083 }
2084
2085 strncpy(sessions[i].name, session->name, NAME_MAX);
2086 sessions[i].name[NAME_MAX - 1] = '\0';
2087 sessions[i].enabled = session->enabled;
2088 i++;
2089 }
2090}
2091
806e2684 2092/*
6d805429
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2093 * Command LTTNG_DATA_PENDING returning 0 if the data is NOT pending meaning
2094 * ready for trace analysis (or anykind of reader) or else 1 for pending data.
806e2684 2095 */
6d805429 2096int cmd_data_pending(struct ltt_session *session)
806e2684
DG
2097{
2098 int ret;
2099 struct ltt_kernel_session *ksess = session->kernel_session;
2100 struct ltt_ust_session *usess = session->ust_session;
2101
2102 assert(session);
2103
2104 /* Session MUST be stopped to ask for data availability. */
2105 if (session->enabled) {
2106 ret = LTTNG_ERR_SESSION_STARTED;
2107 goto error;
2108 }
2109
2110 if (ksess && ksess->consumer) {
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2111 ret = consumer_is_data_pending(ksess->id, ksess->consumer);
2112 if (ret == 1) {
806e2684
DG
2113 /* Data is still being extracted for the kernel. */
2114 goto error;
2115 }
2116 }
2117
2118 if (usess && usess->consumer) {
6d805429
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2119 ret = consumer_is_data_pending(usess->id, usess->consumer);
2120 if (ret == 1) {
806e2684
DG
2121 /* Data is still being extracted for the kernel. */
2122 goto error;
2123 }
2124 }
2125
2126 /* Data is ready to be read by a viewer */
6d805429 2127 ret = 0;
806e2684
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2128
2129error:
2130 return ret;
2131}
2132
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2133/*
2134 * Init command subsystem.
2135 */
2136void cmd_init(void)
2137{
2138 /*
d88aee68
DG
2139 * Set network sequence index to 1 for streams to match a relayd
2140 * socket on the consumer side.
2f77fc4b 2141 */
d88aee68
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2142 pthread_mutex_lock(&relayd_net_seq_idx_lock);
2143 relayd_net_seq_idx = 1;
2144 pthread_mutex_unlock(&relayd_net_seq_idx_lock);
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2145
2146 DBG("Command subsystem initialized");
2147}
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