Fix array size in kconsumer add stream
[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
fac6795d 24#include <grp.h>
1e307fab 25#include <errno.h>
fac6795d
DG
26#include <stdio.h>
27#include <stdlib.h>
28#include <string.h>
29#include <unistd.h>
30
e88129fc 31#include <lttng-sessiond-comm.h>
1e307fab
DG
32#include <lttng-share.h>
33#include <lttng/lttng.h>
34#include <lttngerr.h>
fac6795d
DG
35
36/* Socket to session daemon for communication */
37static int sessiond_socket;
38static char sessiond_sock_path[PATH_MAX];
39
fac6795d
DG
40/* Variables */
41static char *tracing_group;
42static int connected;
43
99497cd0
MD
44/*
45 * Copy string from src to dst and enforce null terminated byte.
46 */
47static void copy_string(char *dst, const char *src, size_t len)
48{
e7d6716d 49 if (src && dst) {
99497cd0
MD
50 strncpy(dst, src, len);
51 /* Enforce the NULL terminated byte */
52 dst[len - 1] = '\0';
cd80958d
DG
53 } else if (dst) {
54 dst[0] = '\0';
99497cd0
MD
55 }
56}
57
fac6795d 58/*
cd80958d 59 * Copy domain to lttcomm_session_msg domain.
fac6795d 60 *
cd80958d
DG
61 * If domain is unknown, default domain will be the kernel.
62 */
63static void copy_lttng_domain(struct lttng_domain *dst, struct lttng_domain *src)
64{
65 if (src && dst) {
66 switch (src->type) {
67 case LTTNG_DOMAIN_KERNEL:
68 case LTTNG_DOMAIN_UST:
69 case LTTNG_DOMAIN_UST_EXEC_NAME:
70 case LTTNG_DOMAIN_UST_PID:
71 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
72 memcpy(dst, src, sizeof(struct lttng_domain));
73 break;
74 default:
75 dst->type = LTTNG_DOMAIN_KERNEL;
76 break;
77 }
78 }
79}
80
81/*
82 * Send lttcomm_session_msg to the session daemon.
fac6795d 83 *
cd80958d
DG
84 * On success, return 0
85 * On error, return error code
fac6795d 86 */
cd80958d 87static int send_session_msg(struct lttcomm_session_msg *lsm)
fac6795d
DG
88{
89 int ret;
90
91 if (!connected) {
e065084a
DG
92 ret = -ENOTCONN;
93 goto end;
fac6795d
DG
94 }
95
cd80958d
DG
96 ret = lttcomm_send_unix_sock(sessiond_socket, lsm,
97 sizeof(struct lttcomm_session_msg));
e065084a
DG
98
99end:
100 return ret;
101}
102
103/*
cd80958d 104 * Receive data from the sessiond socket.
e065084a 105 *
cd80958d
DG
106 * On success, return 0
107 * On error, return recv() error code
e065084a 108 */
ca95a216 109static int recv_data_sessiond(void *buf, size_t len)
e065084a
DG
110{
111 int ret;
112
113 if (!connected) {
114 ret = -ENOTCONN;
115 goto end;
fac6795d
DG
116 }
117
ca95a216 118 ret = lttcomm_recv_unix_sock(sessiond_socket, buf, len);
fac6795d 119
e065084a 120end:
fac6795d
DG
121 return ret;
122}
123
124/*
947308c4 125 * Check if the specified group name exist.
65beb5ff 126 *
2269e89e 127 * If yes return 1, else return -1.
947308c4
DG
128 */
129static int check_tracing_group(const char *grp_name)
130{
131 struct group *grp_tracing; /* no free(). See getgrnam(3) */
132 gid_t *grp_list;
133 int grp_list_size, grp_id, i;
134 int ret = -1;
135
136 /* Get GID of group 'tracing' */
137 grp_tracing = getgrnam(grp_name);
138 if (grp_tracing == NULL) {
139 /* NULL means not found also. getgrnam(3) */
140 if (errno != 0) {
141 perror("getgrnam");
142 }
143 goto end;
144 }
145
146 /* Get number of supplementary group IDs */
147 grp_list_size = getgroups(0, NULL);
148 if (grp_list_size < 0) {
149 perror("getgroups");
150 goto end;
151 }
152
153 /* Alloc group list of the right size */
154 grp_list = malloc(grp_list_size * sizeof(gid_t));
00795392
MD
155 if (!grp_list) {
156 ret = -1;
157 goto end;
158 }
947308c4
DG
159 grp_id = getgroups(grp_list_size, grp_list);
160 if (grp_id < -1) {
161 perror("getgroups");
162 goto free_list;
163 }
164
165 for (i = 0; i < grp_list_size; i++) {
166 if (grp_list[i] == grp_tracing->gr_gid) {
2269e89e 167 ret = 1;
947308c4
DG
168 break;
169 }
170 }
171
172free_list:
173 free(grp_list);
174
175end:
176 return ret;
177}
178
179/*
2269e89e
DG
180 * Try connect to session daemon with sock_path.
181 *
182 * Return 0 on success, else -1
183 */
184static int try_connect_sessiond(const char *sock_path)
185{
186 int ret;
187
188 /* If socket exist, we check if the daemon listens for connect. */
189 ret = access(sock_path, F_OK);
190 if (ret < 0) {
191 /* Not alive */
192 return -1;
193 }
194
195 ret = lttcomm_connect_unix_sock(sock_path);
196 if (ret < 0) {
197 /* Not alive */
198 return -1;
199 }
200
201 ret = lttcomm_close_unix_sock(ret);
202 if (ret < 0) {
203 perror("lttcomm_close_unix_sock");
204 }
205
206 return 0;
207}
208
209/*
210 * Set sessiond socket path by putting it in the global sessiond_sock_path
211 * variable.
947308c4
DG
212 */
213static int set_session_daemon_path(void)
214{
215 int ret;
2269e89e
DG
216 int in_tgroup = 0; /* In tracing group */
217 uid_t uid;
218
219 uid = getuid();
947308c4 220
2269e89e
DG
221 if (uid != 0) {
222 /* Are we in the tracing group ? */
223 in_tgroup = check_tracing_group(tracing_group);
224 }
225
226 if (uid == 0) {
227 /* Root */
228 copy_string(sessiond_sock_path,
229 DEFAULT_GLOBAL_CLIENT_UNIX_SOCK,
230 sizeof(sessiond_sock_path));
231 } else if (in_tgroup) {
232 /* Tracing group */
233 copy_string(sessiond_sock_path,
234 DEFAULT_GLOBAL_CLIENT_UNIX_SOCK,
235 sizeof(sessiond_sock_path));
236
237 ret = try_connect_sessiond(sessiond_sock_path);
238 if (ret < 0) {
239 /* Global session daemon not available */
240 if (snprintf(sessiond_sock_path, sizeof(sessiond_sock_path),
241 DEFAULT_HOME_CLIENT_UNIX_SOCK,
242 getenv("HOME")) < 0) {
243 return -ENOMEM;
244 }
245 }
246 } else {
247 /* Not in tracing group and not root, default */
99497cd0 248 if (snprintf(sessiond_sock_path, PATH_MAX,
cd80958d
DG
249 DEFAULT_HOME_CLIENT_UNIX_SOCK,
250 getenv("HOME")) < 0) {
947308c4
DG
251 return -ENOMEM;
252 }
947308c4
DG
253 }
254
255 return 0;
256}
257
65beb5ff
DG
258/*
259 * Connect to the LTTng session daemon.
260 *
261 * On success, return 0. On error, return -1.
262 */
263static int connect_sessiond(void)
264{
265 int ret;
266
267 ret = set_session_daemon_path();
268 if (ret < 0) {
269 return ret;
270 }
271
272 /* Connect to the sesssion daemon */
273 ret = lttcomm_connect_unix_sock(sessiond_sock_path);
274 if (ret < 0) {
275 return ret;
276 }
277
278 sessiond_socket = ret;
279 connected = 1;
280
281 return 0;
282}
283
284/*
285 * Clean disconnect the session daemon.
286 */
287static int disconnect_sessiond(void)
288{
289 int ret = 0;
290
291 if (connected) {
292 ret = lttcomm_close_unix_sock(sessiond_socket);
293 sessiond_socket = 0;
294 connected = 0;
295 }
296
297 return ret;
298}
299
35a6fdb7 300/*
cd80958d 301 * Ask the session daemon a specific command and put the data into buf.
65beb5ff 302 *
cd80958d 303 * Return size of data (only payload, not header).
65beb5ff 304 */
cd80958d 305static int ask_sessiond(struct lttcomm_session_msg *lsm, void **buf)
65beb5ff
DG
306{
307 int ret;
308 size_t size;
309 void *data = NULL;
cd80958d 310 struct lttcomm_lttng_msg llm;
65beb5ff
DG
311
312 ret = connect_sessiond();
313 if (ret < 0) {
314 goto end;
315 }
316
65beb5ff 317 /* Send command to session daemon */
cd80958d 318 ret = send_session_msg(lsm);
65beb5ff
DG
319 if (ret < 0) {
320 goto end;
321 }
322
323 /* Get header from data transmission */
324 ret = recv_data_sessiond(&llm, sizeof(llm));
325 if (ret < 0) {
326 goto end;
327 }
328
329 /* Check error code if OK */
330 if (llm.ret_code != LTTCOMM_OK) {
331 ret = -llm.ret_code;
332 goto end;
333 }
334
335 size = llm.data_size;
336 if (size == 0) {
7d29a247 337 ret = 0;
65beb5ff
DG
338 goto end;
339 }
340
341 data = (void*) malloc(size);
342
343 /* Get payload data */
344 ret = recv_data_sessiond(data, size);
345 if (ret < 0) {
346 free(data);
347 goto end;
348 }
349
83009e5e
DG
350 /*
351 * Extra protection not to dereference a NULL pointer. If buf is NULL at
352 * this point, an error is returned and data is freed.
353 */
354 if (buf == NULL) {
355 ret = -1;
356 free(data);
357 goto end;
358 }
359
65beb5ff
DG
360 *buf = data;
361 ret = size;
362
363end:
364 disconnect_sessiond();
365 return ret;
366}
367
9f19cc17 368/*
cd80958d 369 * Create lttng handle and return pointer.
9f19cc17 370 */
cd80958d
DG
371struct lttng_handle *lttng_create_handle(const char *session_name,
372 struct lttng_domain *domain)
9f19cc17 373{
cd80958d
DG
374 struct lttng_handle *handle;
375
376 handle = malloc(sizeof(struct lttng_handle));
377 if (handle == NULL) {
378 perror("malloc handle");
379 goto end;
380 }
381
382 /* Copy session name */
383 copy_string(handle->session_name, session_name,
384 sizeof(handle->session_name));
385
386 /* Copy lttng domain */
387 copy_lttng_domain(&handle->domain, domain);
388
389end:
390 return handle;
391}
392
393/*
394 * Destroy handle by free(3) the pointer.
395 */
396void lttng_destroy_handle(struct lttng_handle *handle)
397{
398 if (handle) {
399 free(handle);
eb354453
DG
400 }
401}
402
d9800920
DG
403/*
404 * Register an outside consumer.
405 */
406int lttng_register_consumer(struct lttng_handle *handle,
407 const char *socket_path)
408{
409 struct lttcomm_session_msg lsm;
410
411 lsm.cmd_type = LTTNG_REGISTER_CONSUMER;
412 copy_string(lsm.session.name, handle->session_name,
413 sizeof(lsm.session.name));
414 copy_lttng_domain(&lsm.domain, &handle->domain);
415
416 copy_string(lsm.u.reg.path, socket_path, sizeof(lsm.u.reg.path));
417
418 return ask_sessiond(&lsm, NULL);
419}
420
1df4dedd 421/*
f3ed775e 422 * Start tracing for all trace of the session.
1df4dedd 423 */
cd80958d 424int lttng_start_tracing(struct lttng_handle *handle)
f3ed775e 425{
cd80958d
DG
426 struct lttcomm_session_msg lsm;
427
428 if (!handle) {
429 return -1;
430 }
431
432 lsm.cmd_type = LTTNG_START_TRACE;
433 copy_string(lsm.session.name, handle->session_name,
434 sizeof(lsm.session.name));
435
436 return ask_sessiond(&lsm, NULL);
f3ed775e 437}
1df4dedd
DG
438
439/*
f3ed775e
DG
440 * Stop tracing for all trace of the session.
441 */
cd80958d 442int lttng_stop_tracing(struct lttng_handle *handle)
f3ed775e 443{
cd80958d
DG
444 struct lttcomm_session_msg lsm;
445
446 lsm.cmd_type = LTTNG_STOP_TRACE;
447 copy_string(lsm.session.name, handle->session_name,
448 sizeof(lsm.session.name));
449
450 return ask_sessiond(&lsm, NULL);
f3ed775e
DG
451}
452
453/*
cd80958d 454 * Add context to event or/and channel.
1df4dedd 455 */
cd80958d 456int lttng_add_context(struct lttng_handle *handle,
38057ed1
DG
457 struct lttng_event_context *ctx, const char *event_name,
458 const char *channel_name)
d65106b1 459{
cd80958d
DG
460 struct lttcomm_session_msg lsm;
461
462 if (!handle) {
463 return -1;
464 }
465
466 lsm.cmd_type = LTTNG_ADD_CONTEXT;
467
468 /* Copy channel name */
469 copy_string(lsm.u.context.channel_name, channel_name,
470 sizeof(lsm.u.context.channel_name));
471 /* Copy event name */
472 copy_string(lsm.u.context.event_name, event_name,
473 sizeof(lsm.u.context.event_name));
474
475 copy_lttng_domain(&lsm.domain, &handle->domain);
d65106b1 476
eb354453
DG
477 if (ctx) {
478 memcpy(&lsm.u.context.ctx, ctx, sizeof(struct lttng_event_context));
d65106b1
DG
479 }
480
cd80958d
DG
481 copy_string(lsm.session.name, handle->session_name,
482 sizeof(lsm.session.name));
483
484 return ask_sessiond(&lsm, NULL);
d65106b1
DG
485}
486
f3ed775e 487/*
cd80958d 488 * Enable event
f3ed775e 489 */
cd80958d 490int lttng_enable_event(struct lttng_handle *handle,
38057ed1 491 struct lttng_event *ev, const char *channel_name)
1df4dedd 492{
cd80958d
DG
493 struct lttcomm_session_msg lsm;
494
8c9ae521 495 if (!handle || ev == NULL) {
cd80958d
DG
496 return -1;
497 }
33a2b854 498
94cf3c47 499 if (channel_name == NULL) {
cd80958d
DG
500 copy_string(lsm.u.enable.channel_name, DEFAULT_CHANNEL_NAME,
501 sizeof(lsm.u.enable.channel_name));
33a2b854 502 } else {
cd80958d
DG
503 copy_string(lsm.u.enable.channel_name, channel_name,
504 sizeof(lsm.u.enable.channel_name));
eb354453
DG
505 }
506
cd80958d 507 copy_lttng_domain(&lsm.domain, &handle->domain);
0d0c377a 508
8c9ae521 509 if (ev->name[0] != '\0') {
cd80958d 510 lsm.cmd_type = LTTNG_ENABLE_EVENT;
0d0c377a 511 } else {
cd80958d 512 lsm.cmd_type = LTTNG_ENABLE_ALL_EVENT;
f3ed775e 513 }
8c9ae521 514 memcpy(&lsm.u.enable.event, ev, sizeof(lsm.u.enable.event));
f3ed775e 515
cd80958d
DG
516 copy_string(lsm.session.name, handle->session_name,
517 sizeof(lsm.session.name));
518
519 return ask_sessiond(&lsm, NULL);
1df4dedd
DG
520}
521
522/*
f5177a38 523 * Disable event of a channel and domain.
1df4dedd 524 */
cd80958d 525int lttng_disable_event(struct lttng_handle *handle, const char *name,
38057ed1 526 const char *channel_name)
1df4dedd 527{
cd80958d 528 struct lttcomm_session_msg lsm;
1df4dedd 529
cd80958d
DG
530 if (!handle) {
531 return -1;
532 }
533
534 if (channel_name) {
535 copy_string(lsm.u.disable.channel_name, channel_name,
536 sizeof(lsm.u.disable.channel_name));
f3ed775e 537 } else {
cd80958d
DG
538 copy_string(lsm.u.disable.channel_name, DEFAULT_CHANNEL_NAME,
539 sizeof(lsm.u.disable.channel_name));
eb354453
DG
540 }
541
cd80958d 542 copy_lttng_domain(&lsm.domain, &handle->domain);
f5177a38 543
f84efadf 544 if (name != NULL) {
cd80958d
DG
545 copy_string(lsm.u.disable.name, name, sizeof(lsm.u.disable.name));
546 lsm.cmd_type = LTTNG_DISABLE_EVENT;
f5177a38 547 } else {
cd80958d 548 lsm.cmd_type = LTTNG_DISABLE_ALL_EVENT;
f3ed775e
DG
549 }
550
cd80958d
DG
551 copy_string(lsm.session.name, handle->session_name,
552 sizeof(lsm.session.name));
553
554 return ask_sessiond(&lsm, NULL);
1df4dedd
DG
555}
556
557/*
0d0c377a 558 * Enable channel per domain
a5c5a2bd 559 */
cd80958d 560int lttng_enable_channel(struct lttng_handle *handle,
38057ed1 561 struct lttng_channel *chan)
a5c5a2bd 562{
cd80958d
DG
563 struct lttcomm_session_msg lsm;
564
565 if (!handle) {
566 return -1;
567 }
568
eb354453 569 if (chan) {
cd80958d 570 memcpy(&lsm.u.channel.chan, chan, sizeof(lsm.u.channel.chan));
eb354453 571 }
7d29a247 572
cd80958d
DG
573 lsm.cmd_type = LTTNG_ENABLE_CHANNEL;
574
575 copy_lttng_domain(&lsm.domain, &handle->domain);
7d29a247 576
cd80958d
DG
577 copy_string(lsm.session.name, handle->session_name,
578 sizeof(lsm.session.name));
579
580 return ask_sessiond(&lsm, NULL);
8c0faa1d 581}
1df4dedd 582
2ef84c95 583/*
0b97ec54 584 * All tracing will be stopped for registered events of the channel.
2ef84c95 585 */
cd80958d 586int lttng_disable_channel(struct lttng_handle *handle, const char *name)
2ef84c95 587{
cd80958d
DG
588 struct lttcomm_session_msg lsm;
589
590 if (!handle) {
591 return -1;
592 }
593
594 if (name) {
595 copy_string(lsm.u.disable.channel_name, name,
596 sizeof(lsm.u.disable.channel_name));
597 }
598
599 lsm.cmd_type = LTTNG_DISABLE_CHANNEL;
1df4dedd 600
cd80958d
DG
601 copy_lttng_domain(&lsm.domain, &handle->domain);
602
603 copy_string(lsm.session.name, handle->session_name,
604 sizeof(lsm.session.name));
605
606 return ask_sessiond(&lsm, NULL);
ca95a216
DG
607}
608
fac6795d 609/*
2a71efd5 610 * List all available tracepoints of domain.
fac6795d 611 *
2a71efd5 612 * Return the size (bytes) of the list and set the events array.
7d29a247 613 * On error, return negative value.
fac6795d 614 */
cd80958d 615int lttng_list_tracepoints(struct lttng_handle *handle,
2a71efd5 616 struct lttng_event **events)
fac6795d 617{
052da939 618 int ret;
cd80958d
DG
619 struct lttcomm_session_msg lsm;
620
621 if (!handle) {
622 return -1;
623 }
fac6795d 624
cd80958d
DG
625 lsm.cmd_type = LTTNG_LIST_TRACEPOINTS;
626 copy_lttng_domain(&lsm.domain, &handle->domain);
2a71efd5 627
cd80958d 628 ret = ask_sessiond(&lsm, (void **) events);
052da939
DG
629 if (ret < 0) {
630 return ret;
eb354453 631 }
fac6795d 632
9f19cc17 633 return ret / sizeof(struct lttng_event);
fac6795d
DG
634}
635
1657e9bb 636/*
7d29a247 637 * Return a human readable string of code
1657e9bb 638 */
7d29a247 639const char *lttng_get_readable_code(int code)
1657e9bb 640{
7d29a247
DG
641 if (code > -LTTCOMM_OK) {
642 return "Ended with errors";
1657e9bb
DG
643 }
644
7d29a247 645 return lttcomm_get_readable_code(code);
1657e9bb
DG
646}
647
aaf97519 648/*
894be886 649 * Create a brand new session using name.
aaf97519 650 */
38057ed1 651int lttng_create_session(const char *name, const char *path)
aaf97519 652{
cd80958d
DG
653 struct lttcomm_session_msg lsm;
654
655 lsm.cmd_type = LTTNG_CREATE_SESSION;
656 copy_string(lsm.session.name, name, sizeof(lsm.session.name));
657 copy_string(lsm.session.path, path, sizeof(lsm.session.path));
658
659 return ask_sessiond(&lsm, NULL);
8028d920
DG
660}
661
662/*
8028d920
DG
663 * Destroy session using name.
664 */
cd80958d 665int lttng_destroy_session(struct lttng_handle *handle)
8028d920 666{
cd80958d
DG
667 struct lttcomm_session_msg lsm;
668
669 if (!handle) {
670 return -1;
671 }
672
673 lsm.cmd_type = LTTNG_DESTROY_SESSION;
674 copy_string(lsm.session.name, handle->session_name,
675 sizeof(lsm.session.name));
676
677 return ask_sessiond(&lsm, NULL);
aaf97519
DG
678}
679
57167058 680/*
57167058
DG
681 * Ask the session daemon for all available sessions.
682 *
ca95a216
DG
683 * Return number of session.
684 * On error, return negative value.
57167058 685 */
ca95a216 686int lttng_list_sessions(struct lttng_session **sessions)
57167058 687{
ca95a216 688 int ret;
cd80958d 689 struct lttcomm_session_msg lsm;
57167058 690
cd80958d
DG
691 lsm.cmd_type = LTTNG_LIST_SESSIONS;
692 ret = ask_sessiond(&lsm, (void**) sessions);
57167058 693 if (ret < 0) {
ca95a216 694 return ret;
57167058
DG
695 }
696
ca95a216 697 return ret / sizeof(struct lttng_session);
57167058
DG
698}
699
9f19cc17
DG
700/*
701 * List domain of a session.
702 */
cd80958d
DG
703int lttng_list_domains(struct lttng_handle *handle,
704 struct lttng_domain **domains)
9f19cc17
DG
705{
706 int ret;
cd80958d
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707 struct lttcomm_session_msg lsm;
708
709 if (!handle) {
710 return -1;
711 }
9f19cc17 712
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713 lsm.cmd_type = LTTNG_LIST_DOMAINS;
714
715 copy_string(lsm.session.name, handle->session_name,
716 sizeof(lsm.session.name));
717
718 ret = ask_sessiond(&lsm, (void**) domains);
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719 if (ret < 0) {
720 return ret;
721 }
722
723 return ret / sizeof(struct lttng_domain);
724}
725
726/*
727 * List channels of a session
728 */
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729int lttng_list_channels(struct lttng_handle *handle,
730 struct lttng_channel **channels)
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731{
732 int ret;
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733 struct lttcomm_session_msg lsm;
734
735 if (!handle) {
736 return -1;
737 }
738
739 lsm.cmd_type = LTTNG_LIST_CHANNELS;
740 copy_string(lsm.session.name, handle->session_name,
741 sizeof(lsm.session.name));
9f19cc17 742
cd80958d 743 copy_lttng_domain(&lsm.domain, &handle->domain);
9f19cc17 744
cd80958d 745 ret = ask_sessiond(&lsm, (void**) channels);
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746 if (ret < 0) {
747 return ret;
748 }
749
750 return ret / sizeof(struct lttng_channel);
751}
752
753/*
754 * List events of a session channel.
755 */
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756int lttng_list_events(struct lttng_handle *handle,
757 const char *channel_name, struct lttng_event **events)
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758{
759 int ret;
cd80958d 760 struct lttcomm_session_msg lsm;
9f19cc17 761
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762 if (!handle) {
763 return -1;
764 }
765
766 lsm.cmd_type = LTTNG_LIST_EVENTS;
767 copy_string(lsm.session.name, handle->session_name,
768 sizeof(lsm.session.name));
769 copy_string(lsm.u.list.channel_name, channel_name,
770 sizeof(lsm.u.list.channel_name));
771
772 copy_lttng_domain(&lsm.domain, &handle->domain);
9f19cc17 773
cd80958d 774 ret = ask_sessiond(&lsm, (void**) events);
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775 if (ret < 0) {
776 return ret;
777 }
778
779 return ret / sizeof(struct lttng_event);
780}
781
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782/*
783 * lttng_set_tracing_group
784 *
785 * Set tracing group variable with name. This function
786 * allocate memory pointed by tracing_group.
787 */
788int lttng_set_tracing_group(const char *name)
789{
790 if (asprintf(&tracing_group, "%s", name) < 0) {
791 return -ENOMEM;
792 }
793
794 return 0;
795}
796
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797/*
798 * lttng_calibrate
799 */
cd80958d 800int lttng_calibrate(struct lttng_handle *handle,
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801 struct lttng_calibrate *calibrate)
802{
cd80958d 803 struct lttcomm_session_msg lsm;
d0254c7c 804
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805 if (!handle) {
806 return -1;
807 }
d0254c7c 808
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809 lsm.cmd_type = LTTNG_CALIBRATE;
810 copy_lttng_domain(&lsm.domain, &handle->domain);
d0254c7c 811
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812 memcpy(&lsm.u.calibrate, calibrate, sizeof(lsm.u.calibrate));
813
814 return ask_sessiond(&lsm, NULL);
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815}
816
fac6795d 817/*
2269e89e 818 * Check if session daemon is alive.
fac6795d 819 *
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820 * Return 1 if alive or 0 if not.
821 * On error return -1
fac6795d 822 */
947308c4 823int lttng_session_daemon_alive(void)
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824{
825 int ret;
826
827 ret = set_session_daemon_path();
828 if (ret < 0) {
947308c4 829 /* Error */
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830 return ret;
831 }
832
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833 if (strlen(sessiond_sock_path) == 0) {
834 /* No socket path set. Weird error */
835 return -1;
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836 }
837
2269e89e 838 ret = try_connect_sessiond(sessiond_sock_path);
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839 if (ret < 0) {
840 /* Not alive */
841 return 0;
842 }
7d8234d9 843
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844 /* Is alive */
845 return 1;
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846}
847
848/*
849 * lib constructor
850 */
851static void __attribute__((constructor)) init()
852{
853 /* Set default session group */
64a23ac4 854 lttng_set_tracing_group(LTTNG_DEFAULT_TRACING_GROUP);
fac6795d 855}
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