Fix: change perror to PERROR in kernel consumer
[lttng-tools.git] / src / lib / lttng-ctl / lttng-ctl.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 *
d14d33bf
AM
8 * This library is free software; you can redistribute it and/or modify it
9 * under the terms of the GNU Lesser General Public License, version 2.1 only,
10 * as published by the Free Software Foundation.
82a3637f
DG
11 *
12 * This library is distributed in the hope that it will be useful,
fac6795d 13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
82a3637f
DG
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Lesser General Public License for more details.
16 *
d14d33bf
AM
17 * You should have received a copy of the GNU Lesser General Public License
18 * along with this library; if not, write to the Free Software Foundation,
19 * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
fac6795d
DG
20 */
21
22#define _GNU_SOURCE
44a5e5eb 23#include <assert.h>
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
990570ed
DG
31#include <common/common.h>
32#include <common/defaults.h>
db758600 33#include <common/sessiond-comm/sessiond-comm.h>
a4b92340 34#include <common/uri.h>
feb0f3e5 35#include <common/utils.h>
1e307fab 36#include <lttng/lttng.h>
0c89d795 37#include <lttng/health-internal.h>
fac6795d 38
d00c599e
DG
39#include "filter/filter-ast.h"
40#include "filter/filter-parser.h"
41#include "filter/filter-bytecode.h"
42#include "filter/memstream.h"
cac3069d 43#include "lttng-ctl-helper.h"
53a80697
MD
44
45#ifdef DEBUG
d00c599e 46static const int print_xml = 1;
53a80697
MD
47#define dbg_printf(fmt, args...) \
48 printf("[debug liblttng-ctl] " fmt, ## args)
49#else
d00c599e 50static const int print_xml = 0;
53a80697
MD
51#define dbg_printf(fmt, args...) \
52do { \
53 /* do nothing but check printf format */ \
54 if (0) \
55 printf("[debug liblttnctl] " fmt, ## args); \
56} while (0)
57#endif
58
59
fac6795d
DG
60/* Socket to session daemon for communication */
61static int sessiond_socket;
62static char sessiond_sock_path[PATH_MAX];
63
fac6795d
DG
64/* Variables */
65static char *tracing_group;
66static int connected;
67
97e19046
DG
68/* Global */
69
70/*
71 * Those two variables are used by error.h to silent or control the verbosity of
72 * error message. They are global to the library so application linking with it
73 * are able to compile correctly and also control verbosity of the library.
97e19046
DG
74 */
75int lttng_opt_quiet;
76int lttng_opt_verbose;
c7e35b03 77int lttng_opt_mi;
97e19046 78
99497cd0
MD
79/*
80 * Copy string from src to dst and enforce null terminated byte.
81 */
cac3069d
DG
82LTTNG_HIDDEN
83void lttng_ctl_copy_string(char *dst, const char *src, size_t len)
99497cd0 84{
e7d6716d 85 if (src && dst) {
99497cd0
MD
86 strncpy(dst, src, len);
87 /* Enforce the NULL terminated byte */
88 dst[len - 1] = '\0';
cd80958d
DG
89 } else if (dst) {
90 dst[0] = '\0';
99497cd0
MD
91 }
92}
93
fac6795d 94/*
cd80958d 95 * Copy domain to lttcomm_session_msg domain.
fac6795d 96 *
cd80958d
DG
97 * If domain is unknown, default domain will be the kernel.
98 */
cac3069d
DG
99LTTNG_HIDDEN
100void lttng_ctl_copy_lttng_domain(struct lttng_domain *dst,
101 struct lttng_domain *src)
cd80958d
DG
102{
103 if (src && dst) {
104 switch (src->type) {
00e2e675
DG
105 case LTTNG_DOMAIN_KERNEL:
106 case LTTNG_DOMAIN_UST:
b9dfb167 107 case LTTNG_DOMAIN_JUL:
5cdb6027 108 case LTTNG_DOMAIN_LOG4J:
00e2e675
DG
109 memcpy(dst, src, sizeof(struct lttng_domain));
110 break;
111 default:
112 memset(dst, 0, sizeof(struct lttng_domain));
00e2e675 113 break;
cd80958d
DG
114 }
115 }
116}
117
118/*
119 * Send lttcomm_session_msg to the session daemon.
fac6795d 120 *
1c8d13c8
TD
121 * On success, returns the number of bytes sent (>=0)
122 * On error, returns -1
fac6795d 123 */
cd80958d 124static int send_session_msg(struct lttcomm_session_msg *lsm)
fac6795d
DG
125{
126 int ret;
127
128 if (!connected) {
2f70b271 129 ret = -LTTNG_ERR_NO_SESSIOND;
e065084a 130 goto end;
fac6795d
DG
131 }
132
a4b92340
DG
133 DBG("LSM cmd type : %d", lsm->cmd_type);
134
be040666 135 ret = lttcomm_send_creds_unix_sock(sessiond_socket, lsm,
cd80958d 136 sizeof(struct lttcomm_session_msg));
2f70b271
DG
137 if (ret < 0) {
138 ret = -LTTNG_ERR_FATAL;
139 }
e065084a
DG
140
141end:
142 return ret;
143}
144
53a80697
MD
145/*
146 * Send var len data to the session daemon.
147 *
148 * On success, returns the number of bytes sent (>=0)
149 * On error, returns -1
150 */
151static int send_session_varlen(void *data, size_t len)
152{
153 int ret;
154
155 if (!connected) {
2f70b271 156 ret = -LTTNG_ERR_NO_SESSIOND;
53a80697
MD
157 goto end;
158 }
a4b92340 159
53a80697
MD
160 if (!data || !len) {
161 ret = 0;
162 goto end;
163 }
164
165 ret = lttcomm_send_unix_sock(sessiond_socket, data, len);
2f70b271
DG
166 if (ret < 0) {
167 ret = -LTTNG_ERR_FATAL;
168 }
53a80697
MD
169
170end:
171 return ret;
172}
173
e065084a 174/*
cd80958d 175 * Receive data from the sessiond socket.
e065084a 176 *
1c8d13c8
TD
177 * On success, returns the number of bytes received (>=0)
178 * On error, returns -1 (recvmsg() error) or -ENOTCONN
e065084a 179 */
ca95a216 180static int recv_data_sessiond(void *buf, size_t len)
e065084a
DG
181{
182 int ret;
183
184 if (!connected) {
2f70b271 185 ret = -LTTNG_ERR_NO_SESSIOND;
e065084a 186 goto end;
fac6795d
DG
187 }
188
ca95a216 189 ret = lttcomm_recv_unix_sock(sessiond_socket, buf, len);
2f70b271
DG
190 if (ret < 0) {
191 ret = -LTTNG_ERR_FATAL;
192 }
fac6795d 193
e065084a 194end:
fac6795d
DG
195 return ret;
196}
197
198/*
1c8d13c8 199 * Check if we are in the specified group.
65beb5ff 200 *
2269e89e 201 * If yes return 1, else return -1.
947308c4 202 */
6c71277b
MD
203LTTNG_HIDDEN
204int lttng_check_tracing_group(void)
947308c4
DG
205{
206 struct group *grp_tracing; /* no free(). See getgrnam(3) */
207 gid_t *grp_list;
208 int grp_list_size, grp_id, i;
209 int ret = -1;
6c71277b 210 const char *grp_name = tracing_group;
947308c4
DG
211
212 /* Get GID of group 'tracing' */
213 grp_tracing = getgrnam(grp_name);
b4d8603b
MD
214 if (!grp_tracing) {
215 /* If grp_tracing is NULL, the group does not exist. */
947308c4
DG
216 goto end;
217 }
218
219 /* Get number of supplementary group IDs */
220 grp_list_size = getgroups(0, NULL);
221 if (grp_list_size < 0) {
222 perror("getgroups");
223 goto end;
224 }
225
226 /* Alloc group list of the right size */
227 grp_list = malloc(grp_list_size * sizeof(gid_t));
00795392 228 if (!grp_list) {
1c8d13c8 229 perror("malloc");
00795392
MD
230 goto end;
231 }
947308c4 232 grp_id = getgroups(grp_list_size, grp_list);
1c8d13c8 233 if (grp_id < 0) {
947308c4
DG
234 perror("getgroups");
235 goto free_list;
236 }
237
238 for (i = 0; i < grp_list_size; i++) {
239 if (grp_list[i] == grp_tracing->gr_gid) {
2269e89e 240 ret = 1;
947308c4
DG
241 break;
242 }
243 }
244
245free_list:
246 free(grp_list);
247
248end:
249 return ret;
250}
251
252/*
2269e89e
DG
253 * Try connect to session daemon with sock_path.
254 *
255 * Return 0 on success, else -1
256 */
257static int try_connect_sessiond(const char *sock_path)
258{
259 int ret;
260
261 /* If socket exist, we check if the daemon listens for connect. */
262 ret = access(sock_path, F_OK);
263 if (ret < 0) {
264 /* Not alive */
2f70b271 265 goto error;
2269e89e
DG
266 }
267
268 ret = lttcomm_connect_unix_sock(sock_path);
269 if (ret < 0) {
270 /* Not alive */
2f70b271 271 goto error;
2269e89e
DG
272 }
273
274 ret = lttcomm_close_unix_sock(ret);
275 if (ret < 0) {
276 perror("lttcomm_close_unix_sock");
277 }
278
279 return 0;
2f70b271
DG
280
281error:
282 return -1;
2269e89e
DG
283}
284
285/*
2f70b271
DG
286 * Set sessiond socket path by putting it in the global sessiond_sock_path
287 * variable.
288 *
289 * Returns 0 on success, negative value on failure (the sessiond socket path
290 * is somehow too long or ENOMEM).
947308c4
DG
291 */
292static int set_session_daemon_path(void)
293{
2269e89e
DG
294 int in_tgroup = 0; /* In tracing group */
295 uid_t uid;
296
297 uid = getuid();
947308c4 298
2269e89e
DG
299 if (uid != 0) {
300 /* Are we in the tracing group ? */
6c71277b 301 in_tgroup = lttng_check_tracing_group();
2269e89e
DG
302 }
303
08a9c49f 304 if ((uid == 0) || in_tgroup) {
cac3069d
DG
305 lttng_ctl_copy_string(sessiond_sock_path,
306 DEFAULT_GLOBAL_CLIENT_UNIX_SOCK, sizeof(sessiond_sock_path));
08a9c49f 307 }
2269e89e 308
08a9c49f 309 if (uid != 0) {
c617c0c6
MD
310 int ret;
311
08a9c49f
TD
312 if (in_tgroup) {
313 /* Tracing group */
314 ret = try_connect_sessiond(sessiond_sock_path);
315 if (ret >= 0) {
316 goto end;
2269e89e 317 }
08a9c49f 318 /* Global session daemon not available... */
2269e89e 319 }
08a9c49f
TD
320 /* ...or not in tracing group (and not root), default */
321
322 /*
323 * With GNU C < 2.1, snprintf returns -1 if the target buffer is too small;
324 * With GNU C >= 2.1, snprintf returns the required size (excluding closing null)
325 */
326 ret = snprintf(sessiond_sock_path, sizeof(sessiond_sock_path),
feb0f3e5 327 DEFAULT_HOME_CLIENT_UNIX_SOCK, utils_get_home_dir());
08a9c49f 328 if ((ret < 0) || (ret >= sizeof(sessiond_sock_path))) {
2f70b271 329 goto error;
947308c4 330 }
947308c4 331 }
08a9c49f 332end:
947308c4 333 return 0;
2f70b271
DG
334
335error:
336 return -1;
947308c4
DG
337}
338
65beb5ff
DG
339/*
340 * Connect to the LTTng session daemon.
341 *
342 * On success, return 0. On error, return -1.
343 */
344static int connect_sessiond(void)
345{
346 int ret;
347
da3c9ec1
DG
348 /* Don't try to connect if already connected. */
349 if (connected) {
350 return 0;
351 }
352
65beb5ff
DG
353 ret = set_session_daemon_path();
354 if (ret < 0) {
2f70b271 355 goto error;
65beb5ff
DG
356 }
357
358 /* Connect to the sesssion daemon */
359 ret = lttcomm_connect_unix_sock(sessiond_sock_path);
360 if (ret < 0) {
2f70b271 361 goto error;
65beb5ff
DG
362 }
363
364 sessiond_socket = ret;
365 connected = 1;
366
367 return 0;
2f70b271
DG
368
369error:
370 return -1;
65beb5ff
DG
371}
372
373/*
1c8d13c8
TD
374 * Clean disconnect from the session daemon.
375 * On success, return 0. On error, return -1.
65beb5ff
DG
376 */
377static int disconnect_sessiond(void)
378{
379 int ret = 0;
380
381 if (connected) {
382 ret = lttcomm_close_unix_sock(sessiond_socket);
383 sessiond_socket = 0;
384 connected = 0;
385 }
386
387 return ret;
388}
389
35a6fdb7 390/*
cd80958d 391 * Ask the session daemon a specific command and put the data into buf.
53a80697 392 * Takes extra var. len. data as input to send to the session daemon.
65beb5ff 393 *
af87c45a 394 * Return size of data (only payload, not header) or a negative error code.
65beb5ff 395 */
cac3069d
DG
396LTTNG_HIDDEN
397int lttng_ctl_ask_sessiond_varlen(struct lttcomm_session_msg *lsm,
a4b92340 398 void *vardata, size_t varlen, void **buf)
65beb5ff
DG
399{
400 int ret;
401 size_t size;
402 void *data = NULL;
cd80958d 403 struct lttcomm_lttng_msg llm;
65beb5ff
DG
404
405 ret = connect_sessiond();
406 if (ret < 0) {
2f70b271 407 ret = -LTTNG_ERR_NO_SESSIOND;
65beb5ff
DG
408 goto end;
409 }
410
65beb5ff 411 /* Send command to session daemon */
cd80958d 412 ret = send_session_msg(lsm);
65beb5ff 413 if (ret < 0) {
2f70b271 414 /* Ret value is a valid lttng error code. */
65beb5ff
DG
415 goto end;
416 }
53a80697
MD
417 /* Send var len data */
418 ret = send_session_varlen(vardata, varlen);
419 if (ret < 0) {
2f70b271 420 /* Ret value is a valid lttng error code. */
53a80697
MD
421 goto end;
422 }
65beb5ff
DG
423
424 /* Get header from data transmission */
425 ret = recv_data_sessiond(&llm, sizeof(llm));
426 if (ret < 0) {
2f70b271 427 /* Ret value is a valid lttng error code. */
65beb5ff
DG
428 goto end;
429 }
430
431 /* Check error code if OK */
f73fabfd 432 if (llm.ret_code != LTTNG_OK) {
65beb5ff
DG
433 ret = -llm.ret_code;
434 goto end;
435 }
436
437 size = llm.data_size;
438 if (size == 0) {
874d3f84 439 /* If client free with size 0 */
a45d5536
DG
440 if (buf != NULL) {
441 *buf = NULL;
442 }
7d29a247 443 ret = 0;
65beb5ff
DG
444 goto end;
445 }
446
447 data = (void*) malloc(size);
448
449 /* Get payload data */
450 ret = recv_data_sessiond(data, size);
451 if (ret < 0) {
452 free(data);
453 goto end;
454 }
455
83009e5e
DG
456 /*
457 * Extra protection not to dereference a NULL pointer. If buf is NULL at
458 * this point, an error is returned and data is freed.
459 */
460 if (buf == NULL) {
2f70b271 461 ret = -LTTNG_ERR_INVALID;
83009e5e
DG
462 free(data);
463 goto end;
464 }
465
65beb5ff
DG
466 *buf = data;
467 ret = size;
468
469end:
470 disconnect_sessiond();
471 return ret;
472}
473
9f19cc17 474/*
cd80958d 475 * Create lttng handle and return pointer.
1c8d13c8 476 * The returned pointer will be NULL in case of malloc() error.
9f19cc17 477 */
cd80958d
DG
478struct lttng_handle *lttng_create_handle(const char *session_name,
479 struct lttng_domain *domain)
9f19cc17 480{
2f70b271
DG
481 struct lttng_handle *handle = NULL;
482
483 if (domain == NULL) {
484 goto end;
485 }
cd80958d
DG
486
487 handle = malloc(sizeof(struct lttng_handle));
488 if (handle == NULL) {
2f70b271 489 PERROR("malloc handle");
cd80958d
DG
490 goto end;
491 }
492
493 /* Copy session name */
cac3069d 494 lttng_ctl_copy_string(handle->session_name, session_name,
cd80958d
DG
495 sizeof(handle->session_name));
496
497 /* Copy lttng domain */
cac3069d 498 lttng_ctl_copy_lttng_domain(&handle->domain, domain);
cd80958d
DG
499
500end:
501 return handle;
502}
503
504/*
505 * Destroy handle by free(3) the pointer.
506 */
507void lttng_destroy_handle(struct lttng_handle *handle)
508{
0e428499 509 free(handle);
eb354453
DG
510}
511
d9800920
DG
512/*
513 * Register an outside consumer.
1c8d13c8 514 * Returns size of returned session payload data or a negative error code.
d9800920
DG
515 */
516int lttng_register_consumer(struct lttng_handle *handle,
517 const char *socket_path)
518{
519 struct lttcomm_session_msg lsm;
520
2f70b271
DG
521 if (handle == NULL || socket_path == NULL) {
522 return -LTTNG_ERR_INVALID;
523 }
524
53efb85a 525 memset(&lsm, 0, sizeof(lsm));
d9800920 526 lsm.cmd_type = LTTNG_REGISTER_CONSUMER;
cac3069d 527 lttng_ctl_copy_string(lsm.session.name, handle->session_name,
d9800920 528 sizeof(lsm.session.name));
cac3069d 529 lttng_ctl_copy_lttng_domain(&lsm.domain, &handle->domain);
d9800920 530
cac3069d 531 lttng_ctl_copy_string(lsm.u.reg.path, socket_path, sizeof(lsm.u.reg.path));
d9800920 532
cac3069d 533 return lttng_ctl_ask_sessiond(&lsm, NULL);
d9800920
DG
534}
535
1df4dedd 536/*
1c8d13c8
TD
537 * Start tracing for all traces of the session.
538 * Returns size of returned session payload data or a negative error code.
1df4dedd 539 */
6a4f824d 540int lttng_start_tracing(const char *session_name)
f3ed775e 541{
cd80958d
DG
542 struct lttcomm_session_msg lsm;
543
6a4f824d 544 if (session_name == NULL) {
2f70b271 545 return -LTTNG_ERR_INVALID;
cd80958d
DG
546 }
547
53efb85a 548 memset(&lsm, 0, sizeof(lsm));
cd80958d 549 lsm.cmd_type = LTTNG_START_TRACE;
6a4f824d 550
cac3069d
DG
551 lttng_ctl_copy_string(lsm.session.name, session_name,
552 sizeof(lsm.session.name));
cd80958d 553
cac3069d 554 return lttng_ctl_ask_sessiond(&lsm, NULL);
f3ed775e 555}
1df4dedd
DG
556
557/*
38ee087f 558 * Stop tracing for all traces of the session.
f3ed775e 559 */
38ee087f 560static int _lttng_stop_tracing(const char *session_name, int wait)
f3ed775e 561{
38ee087f 562 int ret, data_ret;
cd80958d
DG
563 struct lttcomm_session_msg lsm;
564
6a4f824d 565 if (session_name == NULL) {
2f70b271 566 return -LTTNG_ERR_INVALID;
6a4f824d
DG
567 }
568
53efb85a 569 memset(&lsm, 0, sizeof(lsm));
cd80958d 570 lsm.cmd_type = LTTNG_STOP_TRACE;
6a4f824d 571
cac3069d
DG
572 lttng_ctl_copy_string(lsm.session.name, session_name,
573 sizeof(lsm.session.name));
cd80958d 574
cac3069d 575 ret = lttng_ctl_ask_sessiond(&lsm, NULL);
38ee087f
DG
576 if (ret < 0 && ret != -LTTNG_ERR_TRACE_ALREADY_STOPPED) {
577 goto error;
578 }
579
580 if (!wait) {
581 goto end;
582 }
583
38ee087f
DG
584 /* Check for data availability */
585 do {
6d805429 586 data_ret = lttng_data_pending(session_name);
38ee087f
DG
587 if (data_ret < 0) {
588 /* Return the data available call error. */
589 ret = data_ret;
590 goto error;
591 }
592
593 /*
594 * Data sleep time before retrying (in usec). Don't sleep if the call
595 * returned value indicates availability.
596 */
6d805429 597 if (data_ret) {
38ee087f 598 usleep(DEFAULT_DATA_AVAILABILITY_WAIT_TIME);
38ee087f 599 }
6d805429 600 } while (data_ret != 0);
38ee087f 601
38ee087f
DG
602end:
603error:
604 return ret;
605}
606
607/*
608 * Stop tracing and wait for data availability.
609 */
610int lttng_stop_tracing(const char *session_name)
611{
612 return _lttng_stop_tracing(session_name, 1);
613}
614
615/*
616 * Stop tracing but _don't_ wait for data availability.
617 */
618int lttng_stop_tracing_no_wait(const char *session_name)
619{
620 return _lttng_stop_tracing(session_name, 0);
f3ed775e
DG
621}
622
623/*
601d5acf
DG
624 * Add context to a channel.
625 *
626 * If the given channel is NULL, add the contexts to all channels.
627 * The event_name param is ignored.
af87c45a
DG
628 *
629 * Returns the size of the returned payload data or a negative error code.
1df4dedd 630 */
cd80958d 631int lttng_add_context(struct lttng_handle *handle,
38057ed1
DG
632 struct lttng_event_context *ctx, const char *event_name,
633 const char *channel_name)
d65106b1 634{
cd80958d
DG
635 struct lttcomm_session_msg lsm;
636
9d697d3d
DG
637 /* Safety check. Both are mandatory */
638 if (handle == NULL || ctx == NULL) {
2f70b271 639 return -LTTNG_ERR_INVALID;
cd80958d
DG
640 }
641
441c16a7
MD
642 memset(&lsm, 0, sizeof(lsm));
643
cd80958d
DG
644 lsm.cmd_type = LTTNG_ADD_CONTEXT;
645
85076754
MD
646 /* If no channel name, send empty string. */
647 if (channel_name == NULL) {
648 lttng_ctl_copy_string(lsm.u.context.channel_name, "",
649 sizeof(lsm.u.context.channel_name));
650 } else {
651 lttng_ctl_copy_string(lsm.u.context.channel_name, channel_name,
652 sizeof(lsm.u.context.channel_name));
653 }
cd80958d 654
cac3069d 655 lttng_ctl_copy_lttng_domain(&lsm.domain, &handle->domain);
d65106b1 656
9d697d3d 657 memcpy(&lsm.u.context.ctx, ctx, sizeof(struct lttng_event_context));
d65106b1 658
cac3069d 659 lttng_ctl_copy_string(lsm.session.name, handle->session_name,
cd80958d
DG
660 sizeof(lsm.session.name));
661
cac3069d 662 return lttng_ctl_ask_sessiond(&lsm, NULL);
d65106b1
DG
663}
664
f3ed775e 665/*
1c8d13c8
TD
666 * Enable event(s) for a channel.
667 * If no event name is specified, all events are enabled.
668 * If no channel name is specified, the default 'channel0' is used.
669 * Returns size of returned session payload data or a negative error code.
f3ed775e 670 */
cd80958d 671int lttng_enable_event(struct lttng_handle *handle,
38057ed1 672 struct lttng_event *ev, const char *channel_name)
1df4dedd 673{
f8a96544
JI
674 return lttng_enable_event_with_exclusions(handle, ev, channel_name,
675 NULL, 0, NULL);
1df4dedd
DG
676}
677
53a80697 678/*
025faf73 679 * Create or enable an event with a filter expression.
178191b3 680 *
53a80697
MD
681 * Return negative error value on error.
682 * Return size of returned session payload data if OK.
683 */
025faf73 684int lttng_enable_event_with_filter(struct lttng_handle *handle,
178191b3 685 struct lttng_event *event, const char *channel_name,
53a80697
MD
686 const char *filter_expression)
687{
f8a96544
JI
688 return lttng_enable_event_with_exclusions(handle, event, channel_name,
689 filter_expression, 0, NULL);
53a80697
MD
690}
691
347c5ab5
DG
692/*
693 * Depending on the event, return a newly allocated JUL filter expression or
694 * NULL if not applicable.
695 *
696 * An event with NO loglevel and the name is * will return NULL.
697 */
698static char *set_jul_filter(const char *filter, struct lttng_event *ev)
699{
700 int err;
701 char *jul_filter = NULL;
702
703 assert(ev);
704
705 /* Don't add filter for the '*' event. */
706 if (ev->name[0] != '*') {
707 if (filter) {
fb0edb23 708 err = asprintf(&jul_filter, "(%s) && (logger_name == \"%s\")", filter,
347c5ab5
DG
709 ev->name);
710 } else {
711 err = asprintf(&jul_filter, "logger_name == \"%s\"", ev->name);
712 }
713 if (err < 0) {
714 PERROR("asprintf");
6a556f7b 715 goto error;
347c5ab5
DG
716 }
717 }
718
719 /* Add loglevel filtering if any for the JUL domain. */
720 if (ev->loglevel_type != LTTNG_EVENT_LOGLEVEL_ALL) {
721 char *op;
722
723 if (ev->loglevel_type == LTTNG_EVENT_LOGLEVEL_RANGE) {
724 op = ">=";
725 } else {
726 op = "==";
727 }
728
6a556f7b
JG
729 if (filter || jul_filter) {
730 char *new_filter;
731
fb0edb23 732 err = asprintf(&new_filter, "(%s) && (int_loglevel %s %d)",
6a556f7b 733 jul_filter ? jul_filter : filter, op,
347c5ab5 734 ev->loglevel);
6a556f7b
JG
735 if (jul_filter) {
736 free(jul_filter);
737 }
738 jul_filter = new_filter;
347c5ab5
DG
739 } else {
740 err = asprintf(&jul_filter, "int_loglevel %s %d", op,
741 ev->loglevel);
742 }
743 if (err < 0) {
744 PERROR("asprintf");
6a556f7b 745 goto error;
347c5ab5
DG
746 }
747 }
748
347c5ab5 749 return jul_filter;
6a556f7b
JG
750error:
751 free(jul_filter);
752 return NULL;
347c5ab5
DG
753}
754
137b9942
DG
755/*
756 * Generate the filter bytecode from a give filter expression string. Put the
757 * newly allocated parser context in ctxp and populate the lsm object with the
758 * expression len.
759 *
760 * Return 0 on success else a LTTNG_ERR_* code and ctxp is untouched.
761 */
762static int generate_filter(char *filter_expression,
763 struct lttcomm_session_msg *lsm, struct filter_parser_ctx **ctxp)
764{
765 int ret;
766 struct filter_parser_ctx *ctx = NULL;
767 FILE *fmem = NULL;
768
769 assert(filter_expression);
770 assert(lsm);
771 assert(ctxp);
772
773 /*
774 * Casting const to non-const, as the underlying function will use it in
775 * read-only mode.
776 */
777 fmem = lttng_fmemopen((void *) filter_expression,
778 strlen(filter_expression), "r");
779 if (!fmem) {
780 fprintf(stderr, "Error opening memory as stream\n");
781 ret = -LTTNG_ERR_FILTER_NOMEM;
782 goto error;
783 }
784 ctx = filter_parser_ctx_alloc(fmem);
785 if (!ctx) {
786 fprintf(stderr, "Error allocating parser\n");
787 ret = -LTTNG_ERR_FILTER_NOMEM;
788 goto filter_alloc_error;
789 }
790 ret = filter_parser_ctx_append_ast(ctx);
791 if (ret) {
792 fprintf(stderr, "Parse error\n");
793 ret = -LTTNG_ERR_FILTER_INVAL;
794 goto parse_error;
795 }
796 ret = filter_visitor_set_parent(ctx);
797 if (ret) {
798 fprintf(stderr, "Set parent error\n");
799 ret = -LTTNG_ERR_FILTER_INVAL;
800 goto parse_error;
801 }
802 if (print_xml) {
803 ret = filter_visitor_print_xml(ctx, stdout, 0);
804 if (ret) {
805 fflush(stdout);
806 fprintf(stderr, "XML print error\n");
807 ret = -LTTNG_ERR_FILTER_INVAL;
808 goto parse_error;
809 }
810 }
811
812 dbg_printf("Generating IR... ");
813 fflush(stdout);
814 ret = filter_visitor_ir_generate(ctx);
815 if (ret) {
816 fprintf(stderr, "Generate IR error\n");
817 ret = -LTTNG_ERR_FILTER_INVAL;
818 goto parse_error;
819 }
820 dbg_printf("done\n");
821
822 dbg_printf("Validating IR... ");
823 fflush(stdout);
824 ret = filter_visitor_ir_check_binary_op_nesting(ctx);
825 if (ret) {
826 ret = -LTTNG_ERR_FILTER_INVAL;
827 goto parse_error;
828 }
dcd5daf2
JG
829 /* Validate strings used as literals in the expression */
830 ret = filter_visitor_ir_validate_string(ctx);
831 if (ret) {
832 ret = -LTTNG_ERR_FILTER_INVAL;
833 goto parse_error;
834 }
137b9942
DG
835 dbg_printf("done\n");
836
837 dbg_printf("Generating bytecode... ");
838 fflush(stdout);
839 ret = filter_visitor_bytecode_generate(ctx);
840 if (ret) {
841 fprintf(stderr, "Generate bytecode error\n");
842 ret = -LTTNG_ERR_FILTER_INVAL;
843 goto parse_error;
844 }
845 dbg_printf("done\n");
846 dbg_printf("Size of bytecode generated: %u bytes.\n",
847 bytecode_get_len(&ctx->bytecode->b));
848
849 lsm->u.enable.bytecode_len = sizeof(ctx->bytecode->b)
850 + bytecode_get_len(&ctx->bytecode->b);
851 lsm->u.enable.expression_len = strlen(filter_expression) + 1;
852
853 /* No need to keep the memory stream. */
854 if (fclose(fmem) != 0) {
855 perror("fclose");
856 }
857
858 *ctxp = ctx;
859 return 0;
860
861parse_error:
137b9942
DG
862 filter_ir_free(ctx);
863 filter_parser_ctx_free(ctx);
864filter_alloc_error:
865 if (fclose(fmem) != 0) {
866 perror("fclose");
867 }
868error:
869 return ret;
870}
871
93deb080
JI
872/*
873 * Enable event(s) for a channel, possibly with exclusions and a filter.
874 * If no event name is specified, all events are enabled.
875 * If no channel name is specified, the default name is used.
876 * If filter expression is not NULL, the filter is set for the event.
877 * If exclusion count is not zero, the exclusions are set for the event.
878 * Returns size of returned session payload data or a negative error code.
879 */
880int lttng_enable_event_with_exclusions(struct lttng_handle *handle,
881 struct lttng_event *ev, const char *channel_name,
e9efbcd3 882 const char *original_filter_expression,
93deb080
JI
883 int exclusion_count, char **exclusion_list)
884{
885 struct lttcomm_session_msg lsm;
64226865 886 char *varlen_data;
93deb080 887 int ret = 0;
137b9942 888 unsigned int free_filter_expression = 0;
93deb080 889 struct filter_parser_ctx *ctx = NULL;
e9efbcd3
JG
890 /*
891 * Cast as non-const since we may replace the filter expression
892 * by a dynamically allocated string. Otherwise, the original
893 * string is not modified.
894 */
895 char *filter_expression = (char *) original_filter_expression;
93deb080
JI
896
897 if (handle == NULL || ev == NULL) {
137b9942
DG
898 ret = -LTTNG_ERR_INVALID;
899 goto error;
93deb080
JI
900 }
901
902 /* Empty filter string will always be rejected by the parser
903 * anyway, so treat this corner-case early to eliminate
904 * lttng_fmemopen error for 0-byte allocation.
905 */
906 if (filter_expression && filter_expression[0] == '\0') {
137b9942
DG
907 ret = -LTTNG_ERR_INVALID;
908 goto error;
93deb080
JI
909 }
910
911 memset(&lsm, 0, sizeof(lsm));
912
913 /* If no channel name, send empty string. */
914 if (channel_name == NULL) {
915 lttng_ctl_copy_string(lsm.u.enable.channel_name, "",
916 sizeof(lsm.u.enable.channel_name));
917 } else {
918 lttng_ctl_copy_string(lsm.u.enable.channel_name, channel_name,
919 sizeof(lsm.u.enable.channel_name));
920 }
921
18a720cd
MD
922 lsm.cmd_type = LTTNG_ENABLE_EVENT;
923 if (ev->name[0] == '\0') {
924 /* Enable all events */
925 lttng_ctl_copy_string(ev->name, "*", sizeof(ev->name));
6565421f 926 }
93deb080 927
6565421f 928 lttng_ctl_copy_lttng_domain(&lsm.domain, &handle->domain);
6e911cad 929 /* FIXME: copying non-packed struct to packed struct. */
93deb080
JI
930 memcpy(&lsm.u.enable.event, ev, sizeof(lsm.u.enable.event));
931
932 lttng_ctl_copy_string(lsm.session.name, handle->session_name,
933 sizeof(lsm.session.name));
934 lsm.u.enable.exclusion_count = exclusion_count;
935 lsm.u.enable.bytecode_len = 0;
936
9b21e6d5
DG
937 /*
938 * For the JUL domain, a filter is enforced except for the enable all
939 * event. This is done to avoid having the event in all sessions thus
940 * filtering by logger name.
941 */
942 if (exclusion_count == 0 && filter_expression == NULL &&
5cdb6027
DG
943 (handle->domain.type != LTTNG_DOMAIN_JUL &&
944 handle->domain.type != LTTNG_DOMAIN_LOG4J)) {
3e1c9ff7 945 goto ask_sessiond;
93deb080
JI
946 }
947
948 /*
949 * We have either a filter or some exclusions, so we need to set up
950 * a variable-length memory block from where to send the data
951 */
952
953 /* Parse filter expression */
5cdb6027
DG
954 if (filter_expression != NULL || handle->domain.type == LTTNG_DOMAIN_JUL
955 || handle->domain.type == LTTNG_DOMAIN_LOG4J) {
956 if (handle->domain.type == LTTNG_DOMAIN_JUL ||
957 handle->domain.type == LTTNG_DOMAIN_LOG4J) {
64226865
DG
958 char *jul_filter;
959
347c5ab5 960 /* Setup JUL filter if needed. */
64226865 961 jul_filter = set_jul_filter(filter_expression, ev);
137b9942
DG
962 if (!jul_filter) {
963 if (!filter_expression) {
964 /* No JUL and no filter, just skip everything below. */
965 goto ask_sessiond;
966 }
64226865
DG
967 } else {
968 /*
969 * With a JUL filter, the original filter has been added to it
970 * thus replace the filter expression.
971 */
e9efbcd3
JG
972 filter_expression = jul_filter;
973 free_filter_expression = 1;
9b21e6d5 974 }
9b21e6d5 975 }
93deb080 976
137b9942 977 ret = generate_filter(filter_expression, &lsm, &ctx);
93deb080 978 if (ret) {
137b9942 979 goto filter_error;
93deb080 980 }
6b453b5e
JG
981 }
982
983 varlen_data = zmalloc(lsm.u.enable.bytecode_len
137b9942
DG
984 + lsm.u.enable.expression_len
985 + LTTNG_SYMBOL_NAME_LEN * exclusion_count);
6b453b5e
JG
986 if (!varlen_data) {
987 ret = -LTTNG_ERR_EXCLUSION_NOMEM;
7ca1dc6f 988 goto mem_error;
6b453b5e 989 }
137b9942 990
6b453b5e
JG
991 /* Put exclusion names first in the data */
992 while (exclusion_count--) {
993 strncpy(varlen_data + LTTNG_SYMBOL_NAME_LEN * exclusion_count,
137b9942 994 *(exclusion_list + exclusion_count), LTTNG_SYMBOL_NAME_LEN);
6b453b5e
JG
995 }
996 /* Add filter expression next */
997 if (lsm.u.enable.expression_len != 0) {
998 memcpy(varlen_data
999 + LTTNG_SYMBOL_NAME_LEN * lsm.u.enable.exclusion_count,
1000 filter_expression,
1001 lsm.u.enable.expression_len);
1002 }
1003 /* Add filter bytecode next */
137b9942 1004 if (ctx && lsm.u.enable.bytecode_len != 0) {
6b453b5e
JG
1005 memcpy(varlen_data
1006 + LTTNG_SYMBOL_NAME_LEN * lsm.u.enable.exclusion_count
1007 + lsm.u.enable.expression_len,
1008 &ctx->bytecode->b,
1009 lsm.u.enable.bytecode_len);
93deb080
JI
1010 }
1011
1012 ret = lttng_ctl_ask_sessiond_varlen(&lsm, varlen_data,
67676bd8 1013 (LTTNG_SYMBOL_NAME_LEN * lsm.u.enable.exclusion_count) +
137b9942 1014 lsm.u.enable.bytecode_len + lsm.u.enable.expression_len, NULL);
6b453b5e 1015 free(varlen_data);
93deb080 1016
7ca1dc6f
DG
1017mem_error:
1018 if (filter_expression && ctx) {
93deb080
JI
1019 filter_bytecode_free(ctx);
1020 filter_ir_free(ctx);
1021 filter_parser_ctx_free(ctx);
7ca1dc6f
DG
1022 }
1023filter_error:
1024 if (free_filter_expression) {
1025 /*
1026 * The filter expression has been replaced and must be freed as it is
1027 * not the original filter expression received as a parameter.
1028 */
1029 free(filter_expression);
93deb080 1030 }
137b9942
DG
1031error:
1032 /*
1033 * Return directly to the caller and don't ask the sessiond since something
1034 * went wrong in the parsing of data above.
1035 */
93deb080 1036 return ret;
3e1c9ff7
DG
1037
1038ask_sessiond:
1039 ret = lttng_ctl_ask_sessiond(&lsm, NULL);
1040 return ret;
93deb080
JI
1041}
1042
6e911cad
MD
1043int lttng_disable_event_ext(struct lttng_handle *handle,
1044 struct lttng_event *ev, const char *channel_name,
1045 const char *original_filter_expression)
1df4dedd 1046{
cd80958d 1047 struct lttcomm_session_msg lsm;
6e911cad
MD
1048 char *varlen_data;
1049 int ret = 0;
1050 unsigned int free_filter_expression = 0;
1051 struct filter_parser_ctx *ctx = NULL;
1052 /*
1053 * Cast as non-const since we may replace the filter expression
1054 * by a dynamically allocated string. Otherwise, the original
1055 * string is not modified.
1056 */
1057 char *filter_expression = (char *) original_filter_expression;
1df4dedd 1058
6e911cad
MD
1059 if (handle == NULL || ev == NULL) {
1060 ret = -LTTNG_ERR_INVALID;
1061 goto error;
1062 }
1063
1064 /* Empty filter string will always be rejected by the parser
1065 * anyway, so treat this corner-case early to eliminate
1066 * lttng_fmemopen error for 0-byte allocation.
1067 */
1068 if (filter_expression && filter_expression[0] == '\0') {
1069 ret = -LTTNG_ERR_INVALID;
1070 goto error;
cd80958d
DG
1071 }
1072
441c16a7
MD
1073 memset(&lsm, 0, sizeof(lsm));
1074
85076754
MD
1075 /* If no channel name, send empty string. */
1076 if (channel_name == NULL) {
1077 lttng_ctl_copy_string(lsm.u.disable.channel_name, "",
cd80958d 1078 sizeof(lsm.u.disable.channel_name));
f3ed775e 1079 } else {
85076754 1080 lttng_ctl_copy_string(lsm.u.disable.channel_name, channel_name,
cd80958d 1081 sizeof(lsm.u.disable.channel_name));
eb354453
DG
1082 }
1083
18a720cd
MD
1084 lsm.cmd_type = LTTNG_DISABLE_EVENT;
1085 if (ev->name[0] == '\0') {
1086 /* Disable all events */
1087 lttng_ctl_copy_string(ev->name, "*", sizeof(ev->name));
f3ed775e
DG
1088 }
1089
6e911cad
MD
1090 lttng_ctl_copy_lttng_domain(&lsm.domain, &handle->domain);
1091 /* FIXME: copying non-packed struct to packed struct. */
1092 memcpy(&lsm.u.disable.event, ev, sizeof(lsm.u.disable.event));
1093
cac3069d 1094 lttng_ctl_copy_string(lsm.session.name, handle->session_name,
cd80958d 1095 sizeof(lsm.session.name));
6e911cad 1096 lsm.u.disable.bytecode_len = 0;
cd80958d 1097
6e911cad
MD
1098 /*
1099 * For the JUL domain, a filter is enforced except for the
1100 * disable all event. This is done to avoid having the event in
1101 * all sessions thus filtering by logger name.
1102 */
1103 if (filter_expression == NULL &&
1104 (handle->domain.type != LTTNG_DOMAIN_JUL &&
1105 handle->domain.type != LTTNG_DOMAIN_LOG4J)) {
1106 goto ask_sessiond;
1107 }
1108
1109 /*
1110 * We have a filter, so we need to set up a variable-length
1111 * memory block from where to send the data.
1112 */
1113
1114 /* Parse filter expression */
1115 if (filter_expression != NULL || handle->domain.type == LTTNG_DOMAIN_JUL
1116 || handle->domain.type == LTTNG_DOMAIN_LOG4J) {
1117 if (handle->domain.type == LTTNG_DOMAIN_JUL ||
1118 handle->domain.type == LTTNG_DOMAIN_LOG4J) {
1119 char *jul_filter;
1120
1121 /* Setup JUL filter if needed. */
1122 jul_filter = set_jul_filter(filter_expression, ev);
1123 if (!jul_filter) {
1124 if (!filter_expression) {
1125 /* No JUL and no filter, just skip everything below. */
1126 goto ask_sessiond;
1127 }
1128 } else {
1129 /*
1130 * With a JUL filter, the original filter has been added to it
1131 * thus replace the filter expression.
1132 */
1133 filter_expression = jul_filter;
1134 free_filter_expression = 1;
1135 }
1136 }
1137
1138 ret = generate_filter(filter_expression, &lsm, &ctx);
1139 if (ret) {
1140 goto filter_error;
1141 }
1142 }
1143
1144 varlen_data = zmalloc(lsm.u.disable.bytecode_len
1145 + lsm.u.disable.expression_len);
1146 if (!varlen_data) {
1147 ret = -LTTNG_ERR_EXCLUSION_NOMEM;
1148 goto mem_error;
1149 }
1150
1151 /* Add filter expression */
1152 if (lsm.u.disable.expression_len != 0) {
1153 memcpy(varlen_data,
1154 filter_expression,
1155 lsm.u.disable.expression_len);
1156 }
1157 /* Add filter bytecode next */
1158 if (ctx && lsm.u.disable.bytecode_len != 0) {
1159 memcpy(varlen_data
1160 + lsm.u.disable.expression_len,
1161 &ctx->bytecode->b,
1162 lsm.u.disable.bytecode_len);
1163 }
1164
1165 ret = lttng_ctl_ask_sessiond_varlen(&lsm, varlen_data,
1166 lsm.u.disable.bytecode_len + lsm.u.disable.expression_len, NULL);
1167 free(varlen_data);
1168
1169mem_error:
1170 if (filter_expression && ctx) {
1171 filter_bytecode_free(ctx);
1172 filter_ir_free(ctx);
1173 filter_parser_ctx_free(ctx);
1174 }
1175filter_error:
1176 if (free_filter_expression) {
1177 /*
1178 * The filter expression has been replaced and must be freed as it is
1179 * not the original filter expression received as a parameter.
1180 */
1181 free(filter_expression);
1182 }
1183error:
1184 /*
1185 * Return directly to the caller and don't ask the sessiond since something
1186 * went wrong in the parsing of data above.
1187 */
1188 return ret;
1189
1190ask_sessiond:
1191 ret = lttng_ctl_ask_sessiond(&lsm, NULL);
1192 return ret;
1193}
1194
1195/*
1196 * Disable event(s) of a channel and domain.
1197 * If no event name is specified, all events are disabled.
1198 * If no channel name is specified, the default 'channel0' is used.
1199 * Returns size of returned session payload data or a negative error code.
1200 */
1201int lttng_disable_event(struct lttng_handle *handle, const char *name,
1202 const char *channel_name)
1203{
1204 struct lttng_event ev;
1205
1206 memset(&ev, 0, sizeof(ev));
1207 ev.type = LTTNG_EVENT_ALL;
1208 lttng_ctl_copy_string(ev.name, name, sizeof(ev.name));
1209 return lttng_disable_event_ext(handle, &ev, channel_name, NULL);
1df4dedd
DG
1210}
1211
1212/*
1c8d13c8
TD
1213 * Enable channel per domain
1214 * Returns size of returned session payload data or a negative error code.
a5c5a2bd 1215 */
cd80958d 1216int lttng_enable_channel(struct lttng_handle *handle,
38057ed1 1217 struct lttng_channel *chan)
a5c5a2bd 1218{
cd80958d
DG
1219 struct lttcomm_session_msg lsm;
1220
5117eeec
DG
1221 /*
1222 * NULL arguments are forbidden. No default values.
1223 */
1224 if (handle == NULL || chan == NULL) {
2f70b271 1225 return -LTTNG_ERR_INVALID;
cd80958d
DG
1226 }
1227
441c16a7
MD
1228 memset(&lsm, 0, sizeof(lsm));
1229
5117eeec 1230 memcpy(&lsm.u.channel.chan, chan, sizeof(lsm.u.channel.chan));
7d29a247 1231
cd80958d
DG
1232 lsm.cmd_type = LTTNG_ENABLE_CHANNEL;
1233
cac3069d 1234 lttng_ctl_copy_lttng_domain(&lsm.domain, &handle->domain);
7d29a247 1235
cac3069d 1236 lttng_ctl_copy_string(lsm.session.name, handle->session_name,
cd80958d
DG
1237 sizeof(lsm.session.name));
1238
cac3069d 1239 return lttng_ctl_ask_sessiond(&lsm, NULL);
8c0faa1d 1240}
1df4dedd 1241
2ef84c95 1242/*
1c8d13c8
TD
1243 * All tracing will be stopped for registered events of the channel.
1244 * Returns size of returned session payload data or a negative error code.
2ef84c95 1245 */
cd80958d 1246int lttng_disable_channel(struct lttng_handle *handle, const char *name)
2ef84c95 1247{
cd80958d
DG
1248 struct lttcomm_session_msg lsm;
1249
9d697d3d
DG
1250 /* Safety check. Both are mandatory */
1251 if (handle == NULL || name == NULL) {
2f70b271 1252 return -LTTNG_ERR_INVALID;
cd80958d
DG
1253 }
1254
441c16a7
MD
1255 memset(&lsm, 0, sizeof(lsm));
1256
cd80958d 1257 lsm.cmd_type = LTTNG_DISABLE_CHANNEL;
1df4dedd 1258
cac3069d 1259 lttng_ctl_copy_string(lsm.u.disable.channel_name, name,
9d697d3d
DG
1260 sizeof(lsm.u.disable.channel_name));
1261
cac3069d 1262 lttng_ctl_copy_lttng_domain(&lsm.domain, &handle->domain);
cd80958d 1263
cac3069d 1264 lttng_ctl_copy_string(lsm.session.name, handle->session_name,
cd80958d
DG
1265 sizeof(lsm.session.name));
1266
cac3069d 1267 return lttng_ctl_ask_sessiond(&lsm, NULL);
ca95a216
DG
1268}
1269
fac6795d 1270/*
1c8d13c8
TD
1271 * Lists all available tracepoints of domain.
1272 * Sets the contents of the events array.
1273 * Returns the number of lttng_event entries in events;
1274 * on error, returns a negative value.
fac6795d 1275 */
cd80958d 1276int lttng_list_tracepoints(struct lttng_handle *handle,
2a71efd5 1277 struct lttng_event **events)
fac6795d 1278{
052da939 1279 int ret;
cd80958d
DG
1280 struct lttcomm_session_msg lsm;
1281
9d697d3d 1282 if (handle == NULL) {
2f70b271 1283 return -LTTNG_ERR_INVALID;
cd80958d 1284 }
fac6795d 1285
53efb85a 1286 memset(&lsm, 0, sizeof(lsm));
cd80958d 1287 lsm.cmd_type = LTTNG_LIST_TRACEPOINTS;
cac3069d 1288 lttng_ctl_copy_lttng_domain(&lsm.domain, &handle->domain);
2a71efd5 1289
cac3069d 1290 ret = lttng_ctl_ask_sessiond(&lsm, (void **) events);
052da939
DG
1291 if (ret < 0) {
1292 return ret;
eb354453 1293 }
fac6795d 1294
9f19cc17 1295 return ret / sizeof(struct lttng_event);
fac6795d
DG
1296}
1297
f37d259d
MD
1298/*
1299 * Lists all available tracepoint fields of domain.
1300 * Sets the contents of the event field array.
1301 * Returns the number of lttng_event_field entries in events;
1302 * on error, returns a negative value.
1303 */
1304int lttng_list_tracepoint_fields(struct lttng_handle *handle,
1305 struct lttng_event_field **fields)
1306{
1307 int ret;
1308 struct lttcomm_session_msg lsm;
1309
1310 if (handle == NULL) {
2f70b271 1311 return -LTTNG_ERR_INVALID;
f37d259d
MD
1312 }
1313
53efb85a 1314 memset(&lsm, 0, sizeof(lsm));
f37d259d 1315 lsm.cmd_type = LTTNG_LIST_TRACEPOINT_FIELDS;
cac3069d 1316 lttng_ctl_copy_lttng_domain(&lsm.domain, &handle->domain);
f37d259d 1317
cac3069d 1318 ret = lttng_ctl_ask_sessiond(&lsm, (void **) fields);
f37d259d
MD
1319 if (ret < 0) {
1320 return ret;
1321 }
1322
1323 return ret / sizeof(struct lttng_event_field);
1324}
1325
1657e9bb 1326/*
1c8d13c8
TD
1327 * Returns a human readable string describing
1328 * the error code (a negative value).
1657e9bb 1329 */
9a745bc7 1330const char *lttng_strerror(int code)
1657e9bb 1331{
f73fabfd 1332 return error_get_str(code);
1657e9bb
DG
1333}
1334
aaf97519 1335/*
a4b92340
DG
1336 * Create a brand new session using name and url for destination.
1337 *
f73fabfd 1338 * Returns LTTNG_OK on success or a negative error code.
00e2e675 1339 */
a4b92340 1340int lttng_create_session(const char *name, const char *url)
00e2e675 1341{
3dd05a85 1342 int ret;
a4b92340 1343 ssize_t size;
00e2e675 1344 struct lttcomm_session_msg lsm;
a4b92340 1345 struct lttng_uri *uris = NULL;
00e2e675 1346
a4b92340 1347 if (name == NULL) {
2f70b271 1348 return -LTTNG_ERR_INVALID;
00e2e675
DG
1349 }
1350
a4b92340 1351 memset(&lsm, 0, sizeof(lsm));
00e2e675 1352
a4b92340 1353 lsm.cmd_type = LTTNG_CREATE_SESSION;
cac3069d 1354 lttng_ctl_copy_string(lsm.session.name, name, sizeof(lsm.session.name));
a4b92340
DG
1355
1356 /* There should never be a data URL */
bc894455 1357 size = uri_parse_str_urls(url, NULL, &uris);
a4b92340 1358 if (size < 0) {
2f70b271 1359 return -LTTNG_ERR_INVALID;
00e2e675
DG
1360 }
1361
a4b92340
DG
1362 lsm.u.uri.size = size;
1363
cac3069d
DG
1364 ret = lttng_ctl_ask_sessiond_varlen(&lsm, uris,
1365 sizeof(struct lttng_uri) * size, NULL);
3dd05a85
DG
1366
1367 free(uris);
1368 return ret;
00e2e675
DG
1369}
1370
8028d920 1371/*
8028d920 1372 * Destroy session using name.
1c8d13c8 1373 * Returns size of returned session payload data or a negative error code.
8028d920 1374 */
843f5df9 1375int lttng_destroy_session(const char *session_name)
8028d920 1376{
cd80958d
DG
1377 struct lttcomm_session_msg lsm;
1378
843f5df9 1379 if (session_name == NULL) {
2f70b271 1380 return -LTTNG_ERR_INVALID;
cd80958d
DG
1381 }
1382
53efb85a 1383 memset(&lsm, 0, sizeof(lsm));
cd80958d 1384 lsm.cmd_type = LTTNG_DESTROY_SESSION;
843f5df9 1385
cac3069d
DG
1386 lttng_ctl_copy_string(lsm.session.name, session_name,
1387 sizeof(lsm.session.name));
cd80958d 1388
cac3069d 1389 return lttng_ctl_ask_sessiond(&lsm, NULL);
aaf97519
DG
1390}
1391
57167058 1392/*
57167058 1393 * Ask the session daemon for all available sessions.
1c8d13c8
TD
1394 * Sets the contents of the sessions array.
1395 * Returns the number of lttng_session entries in sessions;
1396 * on error, returns a negative value.
57167058 1397 */
ca95a216 1398int lttng_list_sessions(struct lttng_session **sessions)
57167058 1399{
ca95a216 1400 int ret;
cd80958d 1401 struct lttcomm_session_msg lsm;
57167058 1402
53efb85a 1403 memset(&lsm, 0, sizeof(lsm));
cd80958d 1404 lsm.cmd_type = LTTNG_LIST_SESSIONS;
cac3069d 1405 ret = lttng_ctl_ask_sessiond(&lsm, (void**) sessions);
57167058 1406 if (ret < 0) {
ca95a216 1407 return ret;
57167058
DG
1408 }
1409
ca95a216 1410 return ret / sizeof(struct lttng_session);
57167058
DG
1411}
1412
9f19cc17 1413/*
1c8d13c8
TD
1414 * Ask the session daemon for all available domains of a session.
1415 * Sets the contents of the domains array.
1416 * Returns the number of lttng_domain entries in domains;
1417 * on error, returns a negative value.
9f19cc17 1418 */
330be774 1419int lttng_list_domains(const char *session_name,
cd80958d 1420 struct lttng_domain **domains)
9f19cc17
DG
1421{
1422 int ret;
cd80958d
DG
1423 struct lttcomm_session_msg lsm;
1424
330be774 1425 if (session_name == NULL) {
2f70b271 1426 return -LTTNG_ERR_INVALID;
cd80958d 1427 }
9f19cc17 1428
53efb85a 1429 memset(&lsm, 0, sizeof(lsm));
cd80958d
DG
1430 lsm.cmd_type = LTTNG_LIST_DOMAINS;
1431
cac3069d
DG
1432 lttng_ctl_copy_string(lsm.session.name, session_name,
1433 sizeof(lsm.session.name));
cd80958d 1434
cac3069d 1435 ret = lttng_ctl_ask_sessiond(&lsm, (void**) domains);
9f19cc17
DG
1436 if (ret < 0) {
1437 return ret;
1438 }
1439
1440 return ret / sizeof(struct lttng_domain);
1441}
1442
1443/*
1c8d13c8
TD
1444 * Ask the session daemon for all available channels of a session.
1445 * Sets the contents of the channels array.
1446 * Returns the number of lttng_channel entries in channels;
1447 * on error, returns a negative value.
9f19cc17 1448 */
cd80958d
DG
1449int lttng_list_channels(struct lttng_handle *handle,
1450 struct lttng_channel **channels)
9f19cc17
DG
1451{
1452 int ret;
cd80958d
DG
1453 struct lttcomm_session_msg lsm;
1454
9d697d3d 1455 if (handle == NULL) {
2f70b271 1456 return -LTTNG_ERR_INVALID;
cd80958d
DG
1457 }
1458
53efb85a 1459 memset(&lsm, 0, sizeof(lsm));
cd80958d 1460 lsm.cmd_type = LTTNG_LIST_CHANNELS;
cac3069d 1461 lttng_ctl_copy_string(lsm.session.name, handle->session_name,
cd80958d 1462 sizeof(lsm.session.name));
9f19cc17 1463
cac3069d 1464 lttng_ctl_copy_lttng_domain(&lsm.domain, &handle->domain);
9f19cc17 1465
cac3069d 1466 ret = lttng_ctl_ask_sessiond(&lsm, (void**) channels);
9f19cc17
DG
1467 if (ret < 0) {
1468 return ret;
1469 }
1470
1471 return ret / sizeof(struct lttng_channel);
1472}
1473
1474/*
1c8d13c8
TD
1475 * Ask the session daemon for all available events of a session channel.
1476 * Sets the contents of the events array.
1477 * Returns the number of lttng_event entries in events;
1478 * on error, returns a negative value.
9f19cc17 1479 */
cd80958d
DG
1480int lttng_list_events(struct lttng_handle *handle,
1481 const char *channel_name, struct lttng_event **events)
9f19cc17
DG
1482{
1483 int ret;
cd80958d 1484 struct lttcomm_session_msg lsm;
9f19cc17 1485
9d697d3d
DG
1486 /* Safety check. An handle and channel name are mandatory */
1487 if (handle == NULL || channel_name == NULL) {
2f70b271 1488 return -LTTNG_ERR_INVALID;
cd80958d
DG
1489 }
1490
53efb85a 1491 memset(&lsm, 0, sizeof(lsm));
cd80958d 1492 lsm.cmd_type = LTTNG_LIST_EVENTS;
cac3069d 1493 lttng_ctl_copy_string(lsm.session.name, handle->session_name,
cd80958d 1494 sizeof(lsm.session.name));
cac3069d 1495 lttng_ctl_copy_string(lsm.u.list.channel_name, channel_name,
cd80958d
DG
1496 sizeof(lsm.u.list.channel_name));
1497
cac3069d 1498 lttng_ctl_copy_lttng_domain(&lsm.domain, &handle->domain);
9f19cc17 1499
cac3069d 1500 ret = lttng_ctl_ask_sessiond(&lsm, (void**) events);
9f19cc17
DG
1501 if (ret < 0) {
1502 return ret;
1503 }
1504
1505 return ret / sizeof(struct lttng_event);
1506}
1507
fac6795d 1508/*
1c8d13c8
TD
1509 * Sets the tracing_group variable with name.
1510 * This function allocates memory pointed to by tracing_group.
1511 * On success, returns 0, on error, returns -1 (null name) or -ENOMEM.
fac6795d
DG
1512 */
1513int lttng_set_tracing_group(const char *name)
1514{
9d697d3d 1515 if (name == NULL) {
2f70b271 1516 return -LTTNG_ERR_INVALID;
9d697d3d
DG
1517 }
1518
fac6795d 1519 if (asprintf(&tracing_group, "%s", name) < 0) {
2f70b271 1520 return -LTTNG_ERR_FATAL;
fac6795d
DG
1521 }
1522
1523 return 0;
1524}
1525
d0254c7c 1526/*
af87c45a 1527 * Returns size of returned session payload data or a negative error code.
d0254c7c 1528 */
cd80958d 1529int lttng_calibrate(struct lttng_handle *handle,
d0254c7c
MD
1530 struct lttng_calibrate *calibrate)
1531{
cd80958d 1532 struct lttcomm_session_msg lsm;
d0254c7c 1533
9d697d3d
DG
1534 /* Safety check. NULL pointer are forbidden */
1535 if (handle == NULL || calibrate == NULL) {
2f70b271 1536 return -LTTNG_ERR_INVALID;
cd80958d 1537 }
d0254c7c 1538
53efb85a 1539 memset(&lsm, 0, sizeof(lsm));
cd80958d 1540 lsm.cmd_type = LTTNG_CALIBRATE;
cac3069d 1541 lttng_ctl_copy_lttng_domain(&lsm.domain, &handle->domain);
d0254c7c 1542
cd80958d
DG
1543 memcpy(&lsm.u.calibrate, calibrate, sizeof(lsm.u.calibrate));
1544
cac3069d 1545 return lttng_ctl_ask_sessiond(&lsm, NULL);
d0254c7c
MD
1546}
1547
5edd7e09
DG
1548/*
1549 * Set default channel attributes.
441c16a7 1550 * If either or both of the arguments are null, attr content is zeroe'd.
5edd7e09
DG
1551 */
1552void lttng_channel_set_default_attr(struct lttng_domain *domain,
1553 struct lttng_channel_attr *attr)
1554{
1555 /* Safety check */
1556 if (attr == NULL || domain == NULL) {
1557 return;
1558 }
1559
eacaa7a6
DS
1560 memset(attr, 0, sizeof(struct lttng_channel_attr));
1561
0a9c6494
DG
1562 /* Same for all domains. */
1563 attr->overwrite = DEFAULT_CHANNEL_OVERWRITE;
1564 attr->tracefile_size = DEFAULT_CHANNEL_TRACEFILE_SIZE;
1565 attr->tracefile_count = DEFAULT_CHANNEL_TRACEFILE_COUNT;
1566
5edd7e09
DG
1567 switch (domain->type) {
1568 case LTTNG_DOMAIN_KERNEL:
d92ff3ef
DG
1569 attr->switch_timer_interval = DEFAULT_KERNEL_CHANNEL_SWITCH_TIMER;
1570 attr->read_timer_interval = DEFAULT_KERNEL_CHANNEL_READ_TIMER;
3e230f92 1571 attr->subbuf_size = default_get_kernel_channel_subbuf_size();
5edd7e09
DG
1572 attr->num_subbuf = DEFAULT_KERNEL_CHANNEL_SUBBUF_NUM;
1573 attr->output = DEFAULT_KERNEL_CHANNEL_OUTPUT;
1574 break;
1575 case LTTNG_DOMAIN_UST:
0a9c6494
DG
1576 switch (domain->buf_type) {
1577 case LTTNG_BUFFER_PER_UID:
1578 attr->subbuf_size = default_get_ust_uid_channel_subbuf_size();
1579 attr->num_subbuf = DEFAULT_UST_UID_CHANNEL_SUBBUF_NUM;
1580 attr->output = DEFAULT_UST_UID_CHANNEL_OUTPUT;
1581 attr->switch_timer_interval = DEFAULT_UST_UID_CHANNEL_SWITCH_TIMER;
1582 attr->read_timer_interval = DEFAULT_UST_UID_CHANNEL_READ_TIMER;
1583 break;
1584 case LTTNG_BUFFER_PER_PID:
1585 default:
1586 attr->subbuf_size = default_get_ust_pid_channel_subbuf_size();
1587 attr->num_subbuf = DEFAULT_UST_PID_CHANNEL_SUBBUF_NUM;
1588 attr->output = DEFAULT_UST_PID_CHANNEL_OUTPUT;
1589 attr->switch_timer_interval = DEFAULT_UST_PID_CHANNEL_SWITCH_TIMER;
1590 attr->read_timer_interval = DEFAULT_UST_PID_CHANNEL_READ_TIMER;
1591 break;
1592 }
5edd7e09 1593 default:
441c16a7 1594 /* Default behavior: leave set to 0. */
5edd7e09
DG
1595 break;
1596 }
1597}
1598
fac6795d 1599/*
2269e89e 1600 * Check if session daemon is alive.
fac6795d 1601 *
2269e89e 1602 * Return 1 if alive or 0 if not.
1c8d13c8 1603 * On error returns a negative value.
fac6795d 1604 */
947308c4 1605int lttng_session_daemon_alive(void)
fac6795d
DG
1606{
1607 int ret;
1608
1609 ret = set_session_daemon_path();
1610 if (ret < 0) {
947308c4 1611 /* Error */
fac6795d
DG
1612 return ret;
1613 }
1614
9d035200 1615 if (*sessiond_sock_path == '\0') {
2f70b271
DG
1616 /*
1617 * No socket path set. Weird error which means the constructor was not
1618 * called.
1619 */
1620 assert(0);
fac6795d
DG
1621 }
1622
2269e89e 1623 ret = try_connect_sessiond(sessiond_sock_path);
7d8234d9
MD
1624 if (ret < 0) {
1625 /* Not alive */
1626 return 0;
1627 }
7d8234d9 1628
947308c4
DG
1629 /* Is alive */
1630 return 1;
fac6795d
DG
1631}
1632
00e2e675 1633/*
a4b92340 1634 * Set URL for a consumer for a session and domain.
00e2e675
DG
1635 *
1636 * Return 0 on success, else a negative value.
1637 */
a4b92340
DG
1638int lttng_set_consumer_url(struct lttng_handle *handle,
1639 const char *control_url, const char *data_url)
00e2e675 1640{
3dd05a85 1641 int ret;
a4b92340 1642 ssize_t size;
00e2e675 1643 struct lttcomm_session_msg lsm;
a4b92340 1644 struct lttng_uri *uris = NULL;
00e2e675 1645
a4b92340 1646 if (handle == NULL || (control_url == NULL && data_url == NULL)) {
2f70b271 1647 return -LTTNG_ERR_INVALID;
00e2e675
DG
1648 }
1649
a4b92340
DG
1650 memset(&lsm, 0, sizeof(lsm));
1651
00e2e675
DG
1652 lsm.cmd_type = LTTNG_SET_CONSUMER_URI;
1653
cac3069d 1654 lttng_ctl_copy_string(lsm.session.name, handle->session_name,
00e2e675 1655 sizeof(lsm.session.name));
cac3069d 1656 lttng_ctl_copy_lttng_domain(&lsm.domain, &handle->domain);
00e2e675 1657
bc894455 1658 size = uri_parse_str_urls(control_url, data_url, &uris);
a4b92340 1659 if (size < 0) {
2f70b271 1660 return -LTTNG_ERR_INVALID;
a4b92340
DG
1661 }
1662
1663 lsm.u.uri.size = size;
00e2e675 1664
cac3069d
DG
1665 ret = lttng_ctl_ask_sessiond_varlen(&lsm, uris,
1666 sizeof(struct lttng_uri) * size, NULL);
3dd05a85
DG
1667
1668 free(uris);
1669 return ret;
00e2e675
DG
1670}
1671
1672/*
9c6bda17 1673 * [OBSOLETE]
00e2e675
DG
1674 */
1675int lttng_enable_consumer(struct lttng_handle *handle)
1676{
785d2d0d 1677 return -ENOSYS;
00e2e675
DG
1678}
1679
1680/*
9c6bda17 1681 * [OBSOLETE]
00e2e675
DG
1682 */
1683int lttng_disable_consumer(struct lttng_handle *handle)
1684{
785d2d0d 1685 return -ENOSYS;
00e2e675
DG
1686}
1687
07424f16
DG
1688/*
1689 * This is an extension of create session that is ONLY and SHOULD only be used
1690 * by the lttng command line program. It exists to avoid using URI parsing in
1691 * the lttng client.
1692 *
1693 * We need the date and time for the trace path subdirectory for the case where
1694 * the user does NOT define one using either -o or -U. Using the normal
1695 * lttng_create_session API call, we have no clue on the session daemon side if
1696 * the URL was generated automatically by the client or define by the user.
1697 *
1698 * So this function "wrapper" is hidden from the public API, takes the datetime
1699 * string and appends it if necessary to the URI subdirectory before sending it
1700 * to the session daemon.
1701 *
1702 * With this extra function, the lttng_create_session call behavior is not
1703 * changed and the timestamp is appended to the URI on the session daemon side
1704 * if necessary.
1705 */
1706int _lttng_create_session_ext(const char *name, const char *url,
1707 const char *datetime)
1708{
3dd05a85 1709 int ret;
07424f16
DG
1710 ssize_t size;
1711 struct lttcomm_session_msg lsm;
1712 struct lttng_uri *uris = NULL;
1713
2bba9e53 1714 if (name == NULL || datetime == NULL) {
2f70b271 1715 return -LTTNG_ERR_INVALID;
07424f16
DG
1716 }
1717
1718 memset(&lsm, 0, sizeof(lsm));
1719
1720 lsm.cmd_type = LTTNG_CREATE_SESSION;
cac3069d 1721 lttng_ctl_copy_string(lsm.session.name, name, sizeof(lsm.session.name));
07424f16
DG
1722
1723 /* There should never be a data URL */
bc894455 1724 size = uri_parse_str_urls(url, NULL, &uris);
07424f16 1725 if (size < 0) {
3dd05a85
DG
1726 ret = -LTTNG_ERR_INVALID;
1727 goto error;
07424f16
DG
1728 }
1729
1730 lsm.u.uri.size = size;
1731
4b35a6b3 1732 if (size > 0 && uris[0].dtype != LTTNG_DST_PATH && strlen(uris[0].subdir) == 0) {
da4aa2b8
DG
1733 /* Don't append datetime if the name was automatically created. */
1734 if (strncmp(name, DEFAULT_SESSION_NAME "-",
1735 strlen(DEFAULT_SESSION_NAME) + 1)) {
1736 ret = snprintf(uris[0].subdir, sizeof(uris[0].subdir), "%s-%s",
1737 name, datetime);
1738 } else {
1739 ret = snprintf(uris[0].subdir, sizeof(uris[0].subdir), "%s", name);
1740 }
07424f16
DG
1741 if (ret < 0) {
1742 PERROR("snprintf uri subdir");
3dd05a85
DG
1743 ret = -LTTNG_ERR_FATAL;
1744 goto error;
07424f16
DG
1745 }
1746 }
1747
cac3069d
DG
1748 ret = lttng_ctl_ask_sessiond_varlen(&lsm, uris,
1749 sizeof(struct lttng_uri) * size, NULL);
3dd05a85
DG
1750
1751error:
1752 free(uris);
1753 return ret;
07424f16
DG
1754}
1755
806e2684
DG
1756/*
1757 * For a given session name, this call checks if the data is ready to be read
1758 * or is still being extracted by the consumer(s) hence not ready to be used by
1759 * any readers.
1760 */
6d805429 1761int lttng_data_pending(const char *session_name)
806e2684
DG
1762{
1763 int ret;
1764 struct lttcomm_session_msg lsm;
1765
1766 if (session_name == NULL) {
1767 return -LTTNG_ERR_INVALID;
1768 }
1769
53efb85a 1770 memset(&lsm, 0, sizeof(lsm));
6d805429 1771 lsm.cmd_type = LTTNG_DATA_PENDING;
806e2684 1772
cac3069d
DG
1773 lttng_ctl_copy_string(lsm.session.name, session_name,
1774 sizeof(lsm.session.name));
806e2684 1775
cac3069d 1776 ret = lttng_ctl_ask_sessiond(&lsm, NULL);
806e2684
DG
1777
1778 /*
cac3069d
DG
1779 * The lttng_ctl_ask_sessiond function negate the return code if it's not
1780 * LTTNG_OK so getting -1 means that the reply ret_code was 1 thus meaning
1781 * that the data is available. Yes it is hackish but for now this is the
1782 * only way.
806e2684
DG
1783 */
1784 if (ret == -1) {
1785 ret = 1;
1786 }
1787
1788 return ret;
1789}
1790
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1791/*
1792 * Create a session exclusively used for snapshot.
1793 *
1794 * Returns LTTNG_OK on success or a negative error code.
1795 */
1796int lttng_create_session_snapshot(const char *name, const char *snapshot_url)
1797{
1798 int ret;
1799 ssize_t size;
1800 struct lttcomm_session_msg lsm;
1801 struct lttng_uri *uris = NULL;
1802
1803 if (name == NULL) {
1804 return -LTTNG_ERR_INVALID;
1805 }
1806
1807 memset(&lsm, 0, sizeof(lsm));
1808
1809 lsm.cmd_type = LTTNG_CREATE_SESSION_SNAPSHOT;
1810 lttng_ctl_copy_string(lsm.session.name, name, sizeof(lsm.session.name));
1811
1812 size = uri_parse_str_urls(snapshot_url, NULL, &uris);
1813 if (size < 0) {
1814 return -LTTNG_ERR_INVALID;
1815 }
1816
1817 lsm.u.uri.size = size;
1818
1819 ret = lttng_ctl_ask_sessiond_varlen(&lsm, uris,
1820 sizeof(struct lttng_uri) * size, NULL);
1821
1822 free(uris);
1823 return ret;
1824}
1825
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1826/*
1827 * Create a session exclusively used for live.
1828 *
1829 * Returns LTTNG_OK on success or a negative error code.
1830 */
1831int lttng_create_session_live(const char *name, const char *url,
1832 unsigned int timer_interval)
1833{
1834 int ret;
1835 ssize_t size;
1836 struct lttcomm_session_msg lsm;
1837 struct lttng_uri *uris = NULL;
1838
1839 if (name == NULL) {
1840 return -LTTNG_ERR_INVALID;
1841 }
1842
1843 memset(&lsm, 0, sizeof(lsm));
1844
1845 lsm.cmd_type = LTTNG_CREATE_SESSION_LIVE;
1846 lttng_ctl_copy_string(lsm.session.name, name, sizeof(lsm.session.name));
1847
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1848 if (url) {
1849 size = uri_parse_str_urls(url, NULL, &uris);
1850 if (size <= 0) {
1851 ret = -LTTNG_ERR_INVALID;
1852 goto end;
1853 }
ecc48a90 1854
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1855 /* file:// is not accepted for live session. */
1856 if (uris[0].dtype == LTTNG_DST_PATH) {
1857 ret = -LTTNG_ERR_INVALID;
1858 goto end;
1859 }
1860 } else {
1861 size = 0;
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1862 }
1863
1864 lsm.u.session_live.nb_uri = size;
1865 lsm.u.session_live.timer_interval = timer_interval;
1866
1867 ret = lttng_ctl_ask_sessiond_varlen(&lsm, uris,
1868 sizeof(struct lttng_uri) * size, NULL);
1869
1870end:
1871 free(uris);
1872 return ret;
1873}
1874
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1875/*
1876 * lib constructor
1877 */
1878static void __attribute__((constructor)) init()
1879{
1880 /* Set default session group */
bbccc3d2 1881 lttng_set_tracing_group(DEFAULT_TRACING_GROUP);
fac6795d 1882}
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1883
1884/*
1885 * lib destructor
1886 */
1887static void __attribute__((destructor)) lttng_ctl_exit()
1888{
1889 free(tracing_group);
1890}
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