Fix missing file for make dist
[lttng-tools.git] / liblttngctl / lttngctl.c
CommitLineData
826d496d 1/*
82a3637f
DG
2 * liblttngctl.c
3 *
4 * Linux Trace Toolkit Control Library
5 *
826d496d 6 * Copyright (C) 2011 David Goulet <david.goulet@polymtl.ca>
fac6795d 7 *
82a3637f
DG
8 * This library is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU Lesser General Public
10 * License as published by the Free Software Foundation; only
11 * version 2.1 of the License.
12 *
13 * This library is distributed in the hope that it will be useful,
fac6795d 14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
82a3637f
DG
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 * Lesser General Public License for more details.
17 *
18 * You should have received a copy of the GNU Lesser General Public
19 * License along with this library; if not, write to the Free Software
20 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
fac6795d
DG
21 */
22
23#define _GNU_SOURCE
24#include <errno.h>
25#include <grp.h>
26#include <stdio.h>
27#include <stdlib.h>
28#include <string.h>
29#include <unistd.h>
30
5b97ec60 31#include <lttng/lttng.h>
fac6795d 32
e88129fc 33#include <lttng-sessiond-comm.h>
fac6795d 34#include "lttngerr.h"
f3ed775e 35#include "lttng-share.h"
fac6795d
DG
36
37/* Socket to session daemon for communication */
38static int sessiond_socket;
39static char sessiond_sock_path[PATH_MAX];
40
fac6795d
DG
41/* Variables */
42static char *tracing_group;
43static int connected;
44
99497cd0
MD
45/*
46 * Copy string from src to dst and enforce null terminated byte.
47 */
48static void copy_string(char *dst, const char *src, size_t len)
49{
e7d6716d 50 if (src && dst) {
99497cd0
MD
51 strncpy(dst, src, len);
52 /* Enforce the NULL terminated byte */
53 dst[len - 1] = '\0';
cd80958d
DG
54 } else if (dst) {
55 dst[0] = '\0';
99497cd0
MD
56 }
57}
58
fac6795d 59/*
cd80958d 60 * Copy domain to lttcomm_session_msg domain.
fac6795d 61 *
cd80958d
DG
62 * If domain is unknown, default domain will be the kernel.
63 */
64static void copy_lttng_domain(struct lttng_domain *dst, struct lttng_domain *src)
65{
66 if (src && dst) {
67 switch (src->type) {
68 case LTTNG_DOMAIN_KERNEL:
69 case LTTNG_DOMAIN_UST:
70 case LTTNG_DOMAIN_UST_EXEC_NAME:
71 case LTTNG_DOMAIN_UST_PID:
72 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
73 memcpy(dst, src, sizeof(struct lttng_domain));
74 break;
75 default:
76 dst->type = LTTNG_DOMAIN_KERNEL;
77 break;
78 }
79 }
80}
81
82/*
83 * Send lttcomm_session_msg to the session daemon.
fac6795d 84 *
cd80958d
DG
85 * On success, return 0
86 * On error, return error code
fac6795d 87 */
cd80958d 88static int send_session_msg(struct lttcomm_session_msg *lsm)
fac6795d
DG
89{
90 int ret;
91
92 if (!connected) {
e065084a
DG
93 ret = -ENOTCONN;
94 goto end;
fac6795d
DG
95 }
96
cd80958d
DG
97 ret = lttcomm_send_unix_sock(sessiond_socket, lsm,
98 sizeof(struct lttcomm_session_msg));
e065084a
DG
99
100end:
101 return ret;
102}
103
104/*
cd80958d 105 * Receive data from the sessiond socket.
e065084a 106 *
cd80958d
DG
107 * On success, return 0
108 * On error, return recv() error code
e065084a 109 */
ca95a216 110static int recv_data_sessiond(void *buf, size_t len)
e065084a
DG
111{
112 int ret;
113
114 if (!connected) {
115 ret = -ENOTCONN;
116 goto end;
fac6795d
DG
117 }
118
ca95a216 119 ret = lttcomm_recv_unix_sock(sessiond_socket, buf, len);
fac6795d 120
e065084a 121end:
fac6795d
DG
122 return ret;
123}
124
125/*
947308c4 126 * Check if the specified group name exist.
65beb5ff
DG
127 *
128 * If yes return 0, else return -1.
947308c4
DG
129 */
130static int check_tracing_group(const char *grp_name)
131{
132 struct group *grp_tracing; /* no free(). See getgrnam(3) */
133 gid_t *grp_list;
134 int grp_list_size, grp_id, i;
135 int ret = -1;
136
137 /* Get GID of group 'tracing' */
138 grp_tracing = getgrnam(grp_name);
139 if (grp_tracing == NULL) {
140 /* NULL means not found also. getgrnam(3) */
141 if (errno != 0) {
142 perror("getgrnam");
143 }
144 goto end;
145 }
146
147 /* Get number of supplementary group IDs */
148 grp_list_size = getgroups(0, NULL);
149 if (grp_list_size < 0) {
150 perror("getgroups");
151 goto end;
152 }
153
154 /* Alloc group list of the right size */
155 grp_list = malloc(grp_list_size * sizeof(gid_t));
156 grp_id = getgroups(grp_list_size, grp_list);
157 if (grp_id < -1) {
158 perror("getgroups");
159 goto free_list;
160 }
161
162 for (i = 0; i < grp_list_size; i++) {
163 if (grp_list[i] == grp_tracing->gr_gid) {
164 ret = 0;
165 break;
166 }
167 }
168
169free_list:
170 free(grp_list);
171
172end:
173 return ret;
174}
175
176/*
65beb5ff
DG
177 * Set sessiond socket path by putting it in the global sessiond_sock_path
178 * variable.
947308c4
DG
179 */
180static int set_session_daemon_path(void)
181{
182 int ret;
183
184 /* Are we in the tracing group ? */
185 ret = check_tracing_group(tracing_group);
186 if (ret < 0 && getuid() != 0) {
99497cd0 187 if (snprintf(sessiond_sock_path, PATH_MAX,
cd80958d
DG
188 DEFAULT_HOME_CLIENT_UNIX_SOCK,
189 getenv("HOME")) < 0) {
947308c4
DG
190 return -ENOMEM;
191 }
192 } else {
cd80958d
DG
193 copy_string(sessiond_sock_path,
194 DEFAULT_GLOBAL_CLIENT_UNIX_SOCK,
195 PATH_MAX);
947308c4
DG
196 }
197
198 return 0;
199}
200
65beb5ff
DG
201/*
202 * Connect to the LTTng session daemon.
203 *
204 * On success, return 0. On error, return -1.
205 */
206static int connect_sessiond(void)
207{
208 int ret;
209
210 ret = set_session_daemon_path();
211 if (ret < 0) {
212 return ret;
213 }
214
215 /* Connect to the sesssion daemon */
216 ret = lttcomm_connect_unix_sock(sessiond_sock_path);
217 if (ret < 0) {
218 return ret;
219 }
220
221 sessiond_socket = ret;
222 connected = 1;
223
224 return 0;
225}
226
227/*
228 * Clean disconnect the session daemon.
229 */
230static int disconnect_sessiond(void)
231{
232 int ret = 0;
233
234 if (connected) {
235 ret = lttcomm_close_unix_sock(sessiond_socket);
236 sessiond_socket = 0;
237 connected = 0;
238 }
239
240 return ret;
241}
242
35a6fdb7 243/*
cd80958d 244 * Ask the session daemon a specific command and put the data into buf.
65beb5ff 245 *
cd80958d 246 * Return size of data (only payload, not header).
65beb5ff 247 */
cd80958d 248static int ask_sessiond(struct lttcomm_session_msg *lsm, void **buf)
65beb5ff
DG
249{
250 int ret;
251 size_t size;
252 void *data = NULL;
cd80958d 253 struct lttcomm_lttng_msg llm;
65beb5ff
DG
254
255 ret = connect_sessiond();
256 if (ret < 0) {
257 goto end;
258 }
259
65beb5ff 260 /* Send command to session daemon */
cd80958d 261 ret = send_session_msg(lsm);
65beb5ff
DG
262 if (ret < 0) {
263 goto end;
264 }
265
266 /* Get header from data transmission */
267 ret = recv_data_sessiond(&llm, sizeof(llm));
268 if (ret < 0) {
269 goto end;
270 }
271
272 /* Check error code if OK */
273 if (llm.ret_code != LTTCOMM_OK) {
274 ret = -llm.ret_code;
275 goto end;
276 }
277
278 size = llm.data_size;
279 if (size == 0) {
7d29a247 280 ret = 0;
65beb5ff
DG
281 goto end;
282 }
283
284 data = (void*) malloc(size);
285
286 /* Get payload data */
287 ret = recv_data_sessiond(data, size);
288 if (ret < 0) {
289 free(data);
290 goto end;
291 }
292
293 *buf = data;
294 ret = size;
295
296end:
297 disconnect_sessiond();
298 return ret;
299}
300
9f19cc17 301/*
cd80958d 302 * Create lttng handle and return pointer.
9f19cc17 303 */
cd80958d
DG
304struct lttng_handle *lttng_create_handle(const char *session_name,
305 struct lttng_domain *domain)
9f19cc17 306{
cd80958d
DG
307 struct lttng_handle *handle;
308
309 handle = malloc(sizeof(struct lttng_handle));
310 if (handle == NULL) {
311 perror("malloc handle");
312 goto end;
313 }
314
315 /* Copy session name */
316 copy_string(handle->session_name, session_name,
317 sizeof(handle->session_name));
318
319 /* Copy lttng domain */
320 copy_lttng_domain(&handle->domain, domain);
321
322end:
323 return handle;
324}
325
326/*
327 * Destroy handle by free(3) the pointer.
328 */
329void lttng_destroy_handle(struct lttng_handle *handle)
330{
331 if (handle) {
332 free(handle);
eb354453
DG
333 }
334}
335
1df4dedd 336/*
f3ed775e 337 * Start tracing for all trace of the session.
1df4dedd 338 */
cd80958d 339int lttng_start_tracing(struct lttng_handle *handle)
f3ed775e 340{
cd80958d
DG
341 struct lttcomm_session_msg lsm;
342
343 if (!handle) {
344 return -1;
345 }
346
347 lsm.cmd_type = LTTNG_START_TRACE;
348 copy_string(lsm.session.name, handle->session_name,
349 sizeof(lsm.session.name));
350
351 return ask_sessiond(&lsm, NULL);
f3ed775e 352}
1df4dedd
DG
353
354/*
f3ed775e
DG
355 * Stop tracing for all trace of the session.
356 */
cd80958d 357int lttng_stop_tracing(struct lttng_handle *handle)
f3ed775e 358{
cd80958d
DG
359 struct lttcomm_session_msg lsm;
360
361 lsm.cmd_type = LTTNG_STOP_TRACE;
362 copy_string(lsm.session.name, handle->session_name,
363 sizeof(lsm.session.name));
364
365 return ask_sessiond(&lsm, NULL);
f3ed775e
DG
366}
367
368/*
cd80958d 369 * Add context to event or/and channel.
1df4dedd 370 */
cd80958d 371int lttng_add_context(struct lttng_handle *handle,
38057ed1
DG
372 struct lttng_event_context *ctx, const char *event_name,
373 const char *channel_name)
d65106b1 374{
cd80958d
DG
375 struct lttcomm_session_msg lsm;
376
377 if (!handle) {
378 return -1;
379 }
380
381 lsm.cmd_type = LTTNG_ADD_CONTEXT;
382
383 /* Copy channel name */
384 copy_string(lsm.u.context.channel_name, channel_name,
385 sizeof(lsm.u.context.channel_name));
386 /* Copy event name */
387 copy_string(lsm.u.context.event_name, event_name,
388 sizeof(lsm.u.context.event_name));
389
390 copy_lttng_domain(&lsm.domain, &handle->domain);
d65106b1 391
eb354453
DG
392 if (ctx) {
393 memcpy(&lsm.u.context.ctx, ctx, sizeof(struct lttng_event_context));
d65106b1
DG
394 }
395
cd80958d
DG
396 copy_string(lsm.session.name, handle->session_name,
397 sizeof(lsm.session.name));
398
399 return ask_sessiond(&lsm, NULL);
d65106b1
DG
400}
401
f3ed775e 402/*
cd80958d 403 * Enable event
f3ed775e 404 */
cd80958d 405int lttng_enable_event(struct lttng_handle *handle,
38057ed1 406 struct lttng_event *ev, const char *channel_name)
1df4dedd 407{
cd80958d
DG
408 struct lttcomm_session_msg lsm;
409
410 if (!handle) {
411 return -1;
412 }
33a2b854 413
94cf3c47 414 if (channel_name == NULL) {
cd80958d
DG
415 copy_string(lsm.u.enable.channel_name, DEFAULT_CHANNEL_NAME,
416 sizeof(lsm.u.enable.channel_name));
33a2b854 417 } else {
cd80958d
DG
418 copy_string(lsm.u.enable.channel_name, channel_name,
419 sizeof(lsm.u.enable.channel_name));
eb354453
DG
420 }
421
cd80958d 422 copy_lttng_domain(&lsm.domain, &handle->domain);
0d0c377a 423
cd80958d
DG
424 if (ev) {
425 lsm.cmd_type = LTTNG_ENABLE_EVENT;
426 memcpy(&lsm.u.enable.event, ev, sizeof(lsm.u.enable.event));
0d0c377a 427 } else {
cd80958d 428 lsm.cmd_type = LTTNG_ENABLE_ALL_EVENT;
f3ed775e
DG
429 }
430
cd80958d
DG
431 copy_string(lsm.session.name, handle->session_name,
432 sizeof(lsm.session.name));
433
434 return ask_sessiond(&lsm, NULL);
1df4dedd
DG
435}
436
437/*
f5177a38 438 * Disable event of a channel and domain.
1df4dedd 439 */
cd80958d 440int lttng_disable_event(struct lttng_handle *handle, const char *name,
38057ed1 441 const char *channel_name)
1df4dedd 442{
cd80958d 443 struct lttcomm_session_msg lsm;
1df4dedd 444
cd80958d
DG
445 if (!handle) {
446 return -1;
447 }
448
449 if (channel_name) {
450 copy_string(lsm.u.disable.channel_name, channel_name,
451 sizeof(lsm.u.disable.channel_name));
f3ed775e 452 } else {
cd80958d
DG
453 copy_string(lsm.u.disable.channel_name, DEFAULT_CHANNEL_NAME,
454 sizeof(lsm.u.disable.channel_name));
eb354453
DG
455 }
456
cd80958d 457 copy_lttng_domain(&lsm.domain, &handle->domain);
f5177a38
DG
458
459 if (name == NULL) {
cd80958d
DG
460 copy_string(lsm.u.disable.name, name, sizeof(lsm.u.disable.name));
461 lsm.cmd_type = LTTNG_DISABLE_EVENT;
f5177a38 462 } else {
cd80958d 463 lsm.cmd_type = LTTNG_DISABLE_ALL_EVENT;
f3ed775e
DG
464 }
465
cd80958d
DG
466 copy_string(lsm.session.name, handle->session_name,
467 sizeof(lsm.session.name));
468
469 return ask_sessiond(&lsm, NULL);
1df4dedd
DG
470}
471
472/*
0d0c377a 473 * Enable channel per domain
a5c5a2bd 474 */
cd80958d 475int lttng_enable_channel(struct lttng_handle *handle,
38057ed1 476 struct lttng_channel *chan)
a5c5a2bd 477{
cd80958d
DG
478 struct lttcomm_session_msg lsm;
479
480 if (!handle) {
481 return -1;
482 }
483
eb354453 484 if (chan) {
cd80958d 485 memcpy(&lsm.u.channel.chan, chan, sizeof(lsm.u.channel.chan));
eb354453 486 }
7d29a247 487
cd80958d
DG
488 lsm.cmd_type = LTTNG_ENABLE_CHANNEL;
489
490 copy_lttng_domain(&lsm.domain, &handle->domain);
7d29a247 491
cd80958d
DG
492 copy_string(lsm.session.name, handle->session_name,
493 sizeof(lsm.session.name));
494
495 return ask_sessiond(&lsm, NULL);
8c0faa1d 496}
1df4dedd 497
2ef84c95 498/*
0b97ec54 499 * All tracing will be stopped for registered events of the channel.
2ef84c95 500 */
cd80958d 501int lttng_disable_channel(struct lttng_handle *handle, const char *name)
2ef84c95 502{
cd80958d
DG
503 struct lttcomm_session_msg lsm;
504
505 if (!handle) {
506 return -1;
507 }
508
509 if (name) {
510 copy_string(lsm.u.disable.channel_name, name,
511 sizeof(lsm.u.disable.channel_name));
512 }
513
514 lsm.cmd_type = LTTNG_DISABLE_CHANNEL;
1df4dedd 515
cd80958d
DG
516 copy_lttng_domain(&lsm.domain, &handle->domain);
517
518 copy_string(lsm.session.name, handle->session_name,
519 sizeof(lsm.session.name));
520
521 return ask_sessiond(&lsm, NULL);
ca95a216
DG
522}
523
fac6795d 524/*
2a71efd5 525 * List all available tracepoints of domain.
fac6795d 526 *
2a71efd5 527 * Return the size (bytes) of the list and set the events array.
7d29a247 528 * On error, return negative value.
fac6795d 529 */
cd80958d 530int lttng_list_tracepoints(struct lttng_handle *handle,
2a71efd5 531 struct lttng_event **events)
fac6795d 532{
052da939 533 int ret;
cd80958d
DG
534 struct lttcomm_session_msg lsm;
535
536 if (!handle) {
537 return -1;
538 }
fac6795d 539
cd80958d
DG
540 lsm.cmd_type = LTTNG_LIST_TRACEPOINTS;
541 copy_lttng_domain(&lsm.domain, &handle->domain);
2a71efd5 542
cd80958d 543 ret = ask_sessiond(&lsm, (void **) events);
052da939
DG
544 if (ret < 0) {
545 return ret;
eb354453 546 }
fac6795d 547
9f19cc17 548 return ret / sizeof(struct lttng_event);
fac6795d
DG
549}
550
1657e9bb 551/*
7d29a247 552 * Return a human readable string of code
1657e9bb 553 */
7d29a247 554const char *lttng_get_readable_code(int code)
1657e9bb 555{
7d29a247
DG
556 if (code > -LTTCOMM_OK) {
557 return "Ended with errors";
1657e9bb
DG
558 }
559
7d29a247 560 return lttcomm_get_readable_code(code);
1657e9bb
DG
561}
562
aaf97519 563/*
894be886 564 * Create a brand new session using name.
aaf97519 565 */
38057ed1 566int lttng_create_session(const char *name, const char *path)
aaf97519 567{
cd80958d
DG
568 struct lttcomm_session_msg lsm;
569
570 lsm.cmd_type = LTTNG_CREATE_SESSION;
571 copy_string(lsm.session.name, name, sizeof(lsm.session.name));
572 copy_string(lsm.session.path, path, sizeof(lsm.session.path));
573
574 return ask_sessiond(&lsm, NULL);
8028d920
DG
575}
576
577/*
8028d920
DG
578 * Destroy session using name.
579 */
cd80958d 580int lttng_destroy_session(struct lttng_handle *handle)
8028d920 581{
cd80958d
DG
582 struct lttcomm_session_msg lsm;
583
584 if (!handle) {
585 return -1;
586 }
587
588 lsm.cmd_type = LTTNG_DESTROY_SESSION;
589 copy_string(lsm.session.name, handle->session_name,
590 sizeof(lsm.session.name));
591
592 return ask_sessiond(&lsm, NULL);
aaf97519
DG
593}
594
57167058 595/*
57167058
DG
596 * Ask the session daemon for all available sessions.
597 *
ca95a216
DG
598 * Return number of session.
599 * On error, return negative value.
57167058 600 */
ca95a216 601int lttng_list_sessions(struct lttng_session **sessions)
57167058 602{
ca95a216 603 int ret;
cd80958d 604 struct lttcomm_session_msg lsm;
57167058 605
cd80958d
DG
606 lsm.cmd_type = LTTNG_LIST_SESSIONS;
607 ret = ask_sessiond(&lsm, (void**) sessions);
57167058 608 if (ret < 0) {
ca95a216 609 return ret;
57167058
DG
610 }
611
ca95a216 612 return ret / sizeof(struct lttng_session);
57167058
DG
613}
614
9f19cc17
DG
615/*
616 * List domain of a session.
617 */
cd80958d
DG
618int lttng_list_domains(struct lttng_handle *handle,
619 struct lttng_domain **domains)
9f19cc17
DG
620{
621 int ret;
cd80958d
DG
622 struct lttcomm_session_msg lsm;
623
624 if (!handle) {
625 return -1;
626 }
9f19cc17 627
cd80958d
DG
628 lsm.cmd_type = LTTNG_LIST_DOMAINS;
629
630 copy_string(lsm.session.name, handle->session_name,
631 sizeof(lsm.session.name));
632
633 ret = ask_sessiond(&lsm, (void**) domains);
9f19cc17
DG
634 if (ret < 0) {
635 return ret;
636 }
637
638 return ret / sizeof(struct lttng_domain);
639}
640
641/*
642 * List channels of a session
643 */
cd80958d
DG
644int lttng_list_channels(struct lttng_handle *handle,
645 struct lttng_channel **channels)
9f19cc17
DG
646{
647 int ret;
cd80958d
DG
648 struct lttcomm_session_msg lsm;
649
650 if (!handle) {
651 return -1;
652 }
653
654 lsm.cmd_type = LTTNG_LIST_CHANNELS;
655 copy_string(lsm.session.name, handle->session_name,
656 sizeof(lsm.session.name));
9f19cc17 657
cd80958d 658 copy_lttng_domain(&lsm.domain, &handle->domain);
9f19cc17 659
cd80958d 660 ret = ask_sessiond(&lsm, (void**) channels);
9f19cc17
DG
661 if (ret < 0) {
662 return ret;
663 }
664
665 return ret / sizeof(struct lttng_channel);
666}
667
668/*
669 * List events of a session channel.
670 */
cd80958d
DG
671int lttng_list_events(struct lttng_handle *handle,
672 const char *channel_name, struct lttng_event **events)
9f19cc17
DG
673{
674 int ret;
cd80958d 675 struct lttcomm_session_msg lsm;
9f19cc17 676
cd80958d
DG
677 if (!handle) {
678 return -1;
679 }
680
681 lsm.cmd_type = LTTNG_LIST_EVENTS;
682 copy_string(lsm.session.name, handle->session_name,
683 sizeof(lsm.session.name));
684 copy_string(lsm.u.list.channel_name, channel_name,
685 sizeof(lsm.u.list.channel_name));
686
687 copy_lttng_domain(&lsm.domain, &handle->domain);
9f19cc17 688
cd80958d 689 ret = ask_sessiond(&lsm, (void**) events);
9f19cc17
DG
690 if (ret < 0) {
691 return ret;
692 }
693
694 return ret / sizeof(struct lttng_event);
695}
696
fac6795d
DG
697/*
698 * lttng_set_tracing_group
699 *
700 * Set tracing group variable with name. This function
701 * allocate memory pointed by tracing_group.
702 */
703int lttng_set_tracing_group(const char *name)
704{
705 if (asprintf(&tracing_group, "%s", name) < 0) {
706 return -ENOMEM;
707 }
708
709 return 0;
710}
711
d0254c7c
MD
712/*
713 * lttng_calibrate
714 */
cd80958d 715int lttng_calibrate(struct lttng_handle *handle,
d0254c7c
MD
716 struct lttng_calibrate *calibrate)
717{
cd80958d 718 struct lttcomm_session_msg lsm;
d0254c7c 719
cd80958d
DG
720 if (!handle) {
721 return -1;
722 }
d0254c7c 723
cd80958d
DG
724 lsm.cmd_type = LTTNG_CALIBRATE;
725 copy_lttng_domain(&lsm.domain, &handle->domain);
d0254c7c 726
cd80958d
DG
727 memcpy(&lsm.u.calibrate, calibrate, sizeof(lsm.u.calibrate));
728
729 return ask_sessiond(&lsm, NULL);
d0254c7c
MD
730}
731
fac6795d
DG
732/*
733 * lttng_check_session_daemon
734 *
947308c4
DG
735 * Yes, return 1
736 * No, return 0
737 * Error, return negative value
fac6795d 738 */
947308c4 739int lttng_session_daemon_alive(void)
fac6795d
DG
740{
741 int ret;
742
743 ret = set_session_daemon_path();
744 if (ret < 0) {
947308c4 745 /* Error */
fac6795d
DG
746 return ret;
747 }
748
7d8234d9 749 /* If socket exist, we check if the daemon listens to connect. */
fac6795d
DG
750 ret = access(sessiond_sock_path, F_OK);
751 if (ret < 0) {
947308c4
DG
752 /* Not alive */
753 return 0;
fac6795d
DG
754 }
755
7d8234d9
MD
756 ret = lttcomm_connect_unix_sock(sessiond_sock_path);
757 if (ret < 0) {
758 /* Not alive */
759 return 0;
760 }
761 ret = lttcomm_close_unix_sock(ret);
762 if (ret < 0)
763 perror("lttcomm_close_unix_sock");
764
947308c4
DG
765 /* Is alive */
766 return 1;
fac6795d
DG
767}
768
769/*
770 * lib constructor
771 */
772static void __attribute__((constructor)) init()
773{
774 /* Set default session group */
64a23ac4 775 lttng_set_tracing_group(LTTNG_DEFAULT_TRACING_GROUP);
fac6795d 776}
This page took 0.059796 seconds and 4 git commands to generate.