Commit | Line | Data |
---|---|---|
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 | 46 | static const int print_xml = 1; |
53a80697 MD |
47 | #define dbg_printf(fmt, args...) \ |
48 | printf("[debug liblttng-ctl] " fmt, ## args) | |
49 | #else | |
d00c599e | 50 | static const int print_xml = 0; |
53a80697 MD |
51 | #define dbg_printf(fmt, args...) \ |
52 | do { \ | |
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 */ |
61 | static int sessiond_socket; | |
62 | static char sessiond_sock_path[PATH_MAX]; | |
63 | ||
fac6795d DG |
64 | /* Variables */ |
65 | static char *tracing_group; | |
66 | static 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 | */ |
75 | int lttng_opt_quiet; | |
76 | int lttng_opt_verbose; | |
77 | ||
99497cd0 MD |
78 | /* |
79 | * Copy string from src to dst and enforce null terminated byte. | |
80 | */ | |
cac3069d DG |
81 | LTTNG_HIDDEN |
82 | void lttng_ctl_copy_string(char *dst, const char *src, size_t len) | |
99497cd0 | 83 | { |
e7d6716d | 84 | if (src && dst) { |
99497cd0 MD |
85 | strncpy(dst, src, len); |
86 | /* Enforce the NULL terminated byte */ | |
87 | dst[len - 1] = '\0'; | |
cd80958d DG |
88 | } else if (dst) { |
89 | dst[0] = '\0'; | |
99497cd0 MD |
90 | } |
91 | } | |
92 | ||
fac6795d | 93 | /* |
cd80958d | 94 | * Copy domain to lttcomm_session_msg domain. |
fac6795d | 95 | * |
cd80958d DG |
96 | * If domain is unknown, default domain will be the kernel. |
97 | */ | |
cac3069d DG |
98 | LTTNG_HIDDEN |
99 | void lttng_ctl_copy_lttng_domain(struct lttng_domain *dst, | |
100 | struct lttng_domain *src) | |
cd80958d DG |
101 | { |
102 | if (src && dst) { | |
103 | switch (src->type) { | |
00e2e675 DG |
104 | case LTTNG_DOMAIN_KERNEL: |
105 | case LTTNG_DOMAIN_UST: | |
00e2e675 DG |
106 | memcpy(dst, src, sizeof(struct lttng_domain)); |
107 | break; | |
108 | default: | |
109 | memset(dst, 0, sizeof(struct lttng_domain)); | |
00e2e675 | 110 | break; |
cd80958d DG |
111 | } |
112 | } | |
113 | } | |
114 | ||
115 | /* | |
116 | * Send lttcomm_session_msg to the session daemon. | |
fac6795d | 117 | * |
1c8d13c8 TD |
118 | * On success, returns the number of bytes sent (>=0) |
119 | * On error, returns -1 | |
fac6795d | 120 | */ |
cd80958d | 121 | static int send_session_msg(struct lttcomm_session_msg *lsm) |
fac6795d DG |
122 | { |
123 | int ret; | |
124 | ||
125 | if (!connected) { | |
2f70b271 | 126 | ret = -LTTNG_ERR_NO_SESSIOND; |
e065084a | 127 | goto end; |
fac6795d DG |
128 | } |
129 | ||
a4b92340 DG |
130 | DBG("LSM cmd type : %d", lsm->cmd_type); |
131 | ||
be040666 | 132 | ret = lttcomm_send_creds_unix_sock(sessiond_socket, lsm, |
cd80958d | 133 | sizeof(struct lttcomm_session_msg)); |
2f70b271 DG |
134 | if (ret < 0) { |
135 | ret = -LTTNG_ERR_FATAL; | |
136 | } | |
e065084a DG |
137 | |
138 | end: | |
139 | return ret; | |
140 | } | |
141 | ||
53a80697 MD |
142 | /* |
143 | * Send var len data to the session daemon. | |
144 | * | |
145 | * On success, returns the number of bytes sent (>=0) | |
146 | * On error, returns -1 | |
147 | */ | |
148 | static int send_session_varlen(void *data, size_t len) | |
149 | { | |
150 | int ret; | |
151 | ||
152 | if (!connected) { | |
2f70b271 | 153 | ret = -LTTNG_ERR_NO_SESSIOND; |
53a80697 MD |
154 | goto end; |
155 | } | |
a4b92340 | 156 | |
53a80697 MD |
157 | if (!data || !len) { |
158 | ret = 0; | |
159 | goto end; | |
160 | } | |
161 | ||
162 | ret = lttcomm_send_unix_sock(sessiond_socket, data, len); | |
2f70b271 DG |
163 | if (ret < 0) { |
164 | ret = -LTTNG_ERR_FATAL; | |
165 | } | |
53a80697 MD |
166 | |
167 | end: | |
168 | return ret; | |
169 | } | |
170 | ||
e065084a | 171 | /* |
cd80958d | 172 | * Receive data from the sessiond socket. |
e065084a | 173 | * |
1c8d13c8 TD |
174 | * On success, returns the number of bytes received (>=0) |
175 | * On error, returns -1 (recvmsg() error) or -ENOTCONN | |
e065084a | 176 | */ |
ca95a216 | 177 | static int recv_data_sessiond(void *buf, size_t len) |
e065084a DG |
178 | { |
179 | int ret; | |
180 | ||
181 | if (!connected) { | |
2f70b271 | 182 | ret = -LTTNG_ERR_NO_SESSIOND; |
e065084a | 183 | goto end; |
fac6795d DG |
184 | } |
185 | ||
ca95a216 | 186 | ret = lttcomm_recv_unix_sock(sessiond_socket, buf, len); |
2f70b271 DG |
187 | if (ret < 0) { |
188 | ret = -LTTNG_ERR_FATAL; | |
189 | } | |
fac6795d | 190 | |
e065084a | 191 | end: |
fac6795d DG |
192 | return ret; |
193 | } | |
194 | ||
195 | /* | |
1c8d13c8 | 196 | * Check if we are in the specified group. |
65beb5ff | 197 | * |
2269e89e | 198 | * If yes return 1, else return -1. |
947308c4 | 199 | */ |
6c71277b MD |
200 | LTTNG_HIDDEN |
201 | int lttng_check_tracing_group(void) | |
947308c4 DG |
202 | { |
203 | struct group *grp_tracing; /* no free(). See getgrnam(3) */ | |
204 | gid_t *grp_list; | |
205 | int grp_list_size, grp_id, i; | |
206 | int ret = -1; | |
6c71277b | 207 | const char *grp_name = tracing_group; |
947308c4 DG |
208 | |
209 | /* Get GID of group 'tracing' */ | |
210 | grp_tracing = getgrnam(grp_name); | |
b4d8603b MD |
211 | if (!grp_tracing) { |
212 | /* If grp_tracing is NULL, the group does not exist. */ | |
947308c4 DG |
213 | goto end; |
214 | } | |
215 | ||
216 | /* Get number of supplementary group IDs */ | |
217 | grp_list_size = getgroups(0, NULL); | |
218 | if (grp_list_size < 0) { | |
219 | perror("getgroups"); | |
220 | goto end; | |
221 | } | |
222 | ||
223 | /* Alloc group list of the right size */ | |
224 | grp_list = malloc(grp_list_size * sizeof(gid_t)); | |
00795392 | 225 | if (!grp_list) { |
1c8d13c8 | 226 | perror("malloc"); |
00795392 MD |
227 | goto end; |
228 | } | |
947308c4 | 229 | grp_id = getgroups(grp_list_size, grp_list); |
1c8d13c8 | 230 | if (grp_id < 0) { |
947308c4 DG |
231 | perror("getgroups"); |
232 | goto free_list; | |
233 | } | |
234 | ||
235 | for (i = 0; i < grp_list_size; i++) { | |
236 | if (grp_list[i] == grp_tracing->gr_gid) { | |
2269e89e | 237 | ret = 1; |
947308c4 DG |
238 | break; |
239 | } | |
240 | } | |
241 | ||
242 | free_list: | |
243 | free(grp_list); | |
244 | ||
245 | end: | |
246 | return ret; | |
247 | } | |
248 | ||
249 | /* | |
2269e89e DG |
250 | * Try connect to session daemon with sock_path. |
251 | * | |
252 | * Return 0 on success, else -1 | |
253 | */ | |
254 | static int try_connect_sessiond(const char *sock_path) | |
255 | { | |
256 | int ret; | |
257 | ||
258 | /* If socket exist, we check if the daemon listens for connect. */ | |
259 | ret = access(sock_path, F_OK); | |
260 | if (ret < 0) { | |
261 | /* Not alive */ | |
2f70b271 | 262 | goto error; |
2269e89e DG |
263 | } |
264 | ||
265 | ret = lttcomm_connect_unix_sock(sock_path); | |
266 | if (ret < 0) { | |
267 | /* Not alive */ | |
2f70b271 | 268 | goto error; |
2269e89e DG |
269 | } |
270 | ||
271 | ret = lttcomm_close_unix_sock(ret); | |
272 | if (ret < 0) { | |
273 | perror("lttcomm_close_unix_sock"); | |
274 | } | |
275 | ||
276 | return 0; | |
2f70b271 DG |
277 | |
278 | error: | |
279 | return -1; | |
2269e89e DG |
280 | } |
281 | ||
282 | /* | |
2f70b271 DG |
283 | * Set sessiond socket path by putting it in the global sessiond_sock_path |
284 | * variable. | |
285 | * | |
286 | * Returns 0 on success, negative value on failure (the sessiond socket path | |
287 | * is somehow too long or ENOMEM). | |
947308c4 DG |
288 | */ |
289 | static int set_session_daemon_path(void) | |
290 | { | |
2269e89e DG |
291 | int in_tgroup = 0; /* In tracing group */ |
292 | uid_t uid; | |
293 | ||
294 | uid = getuid(); | |
947308c4 | 295 | |
2269e89e DG |
296 | if (uid != 0) { |
297 | /* Are we in the tracing group ? */ | |
6c71277b | 298 | in_tgroup = lttng_check_tracing_group(); |
2269e89e DG |
299 | } |
300 | ||
08a9c49f | 301 | if ((uid == 0) || in_tgroup) { |
cac3069d DG |
302 | lttng_ctl_copy_string(sessiond_sock_path, |
303 | DEFAULT_GLOBAL_CLIENT_UNIX_SOCK, sizeof(sessiond_sock_path)); | |
08a9c49f | 304 | } |
2269e89e | 305 | |
08a9c49f | 306 | if (uid != 0) { |
c617c0c6 MD |
307 | int ret; |
308 | ||
08a9c49f TD |
309 | if (in_tgroup) { |
310 | /* Tracing group */ | |
311 | ret = try_connect_sessiond(sessiond_sock_path); | |
312 | if (ret >= 0) { | |
313 | goto end; | |
2269e89e | 314 | } |
08a9c49f | 315 | /* Global session daemon not available... */ |
2269e89e | 316 | } |
08a9c49f TD |
317 | /* ...or not in tracing group (and not root), default */ |
318 | ||
319 | /* | |
320 | * With GNU C < 2.1, snprintf returns -1 if the target buffer is too small; | |
321 | * With GNU C >= 2.1, snprintf returns the required size (excluding closing null) | |
322 | */ | |
323 | ret = snprintf(sessiond_sock_path, sizeof(sessiond_sock_path), | |
feb0f3e5 | 324 | DEFAULT_HOME_CLIENT_UNIX_SOCK, utils_get_home_dir()); |
08a9c49f | 325 | if ((ret < 0) || (ret >= sizeof(sessiond_sock_path))) { |
2f70b271 | 326 | goto error; |
947308c4 | 327 | } |
947308c4 | 328 | } |
08a9c49f | 329 | end: |
947308c4 | 330 | return 0; |
2f70b271 DG |
331 | |
332 | error: | |
333 | return -1; | |
947308c4 DG |
334 | } |
335 | ||
65beb5ff DG |
336 | /* |
337 | * Connect to the LTTng session daemon. | |
338 | * | |
339 | * On success, return 0. On error, return -1. | |
340 | */ | |
341 | static int connect_sessiond(void) | |
342 | { | |
343 | int ret; | |
344 | ||
da3c9ec1 DG |
345 | /* Don't try to connect if already connected. */ |
346 | if (connected) { | |
347 | return 0; | |
348 | } | |
349 | ||
65beb5ff DG |
350 | ret = set_session_daemon_path(); |
351 | if (ret < 0) { | |
2f70b271 | 352 | goto error; |
65beb5ff DG |
353 | } |
354 | ||
355 | /* Connect to the sesssion daemon */ | |
356 | ret = lttcomm_connect_unix_sock(sessiond_sock_path); | |
357 | if (ret < 0) { | |
2f70b271 | 358 | goto error; |
65beb5ff DG |
359 | } |
360 | ||
361 | sessiond_socket = ret; | |
362 | connected = 1; | |
363 | ||
364 | return 0; | |
2f70b271 DG |
365 | |
366 | error: | |
367 | return -1; | |
65beb5ff DG |
368 | } |
369 | ||
370 | /* | |
1c8d13c8 TD |
371 | * Clean disconnect from the session daemon. |
372 | * On success, return 0. On error, return -1. | |
65beb5ff DG |
373 | */ |
374 | static int disconnect_sessiond(void) | |
375 | { | |
376 | int ret = 0; | |
377 | ||
378 | if (connected) { | |
379 | ret = lttcomm_close_unix_sock(sessiond_socket); | |
380 | sessiond_socket = 0; | |
381 | connected = 0; | |
382 | } | |
383 | ||
384 | return ret; | |
385 | } | |
386 | ||
35a6fdb7 | 387 | /* |
cd80958d | 388 | * Ask the session daemon a specific command and put the data into buf. |
53a80697 | 389 | * Takes extra var. len. data as input to send to the session daemon. |
65beb5ff | 390 | * |
af87c45a | 391 | * Return size of data (only payload, not header) or a negative error code. |
65beb5ff | 392 | */ |
cac3069d DG |
393 | LTTNG_HIDDEN |
394 | int lttng_ctl_ask_sessiond_varlen(struct lttcomm_session_msg *lsm, | |
a4b92340 | 395 | void *vardata, size_t varlen, void **buf) |
65beb5ff DG |
396 | { |
397 | int ret; | |
398 | size_t size; | |
399 | void *data = NULL; | |
cd80958d | 400 | struct lttcomm_lttng_msg llm; |
65beb5ff DG |
401 | |
402 | ret = connect_sessiond(); | |
403 | if (ret < 0) { | |
2f70b271 | 404 | ret = -LTTNG_ERR_NO_SESSIOND; |
65beb5ff DG |
405 | goto end; |
406 | } | |
407 | ||
65beb5ff | 408 | /* Send command to session daemon */ |
cd80958d | 409 | ret = send_session_msg(lsm); |
65beb5ff | 410 | if (ret < 0) { |
2f70b271 | 411 | /* Ret value is a valid lttng error code. */ |
65beb5ff DG |
412 | goto end; |
413 | } | |
53a80697 MD |
414 | /* Send var len data */ |
415 | ret = send_session_varlen(vardata, varlen); | |
416 | if (ret < 0) { | |
2f70b271 | 417 | /* Ret value is a valid lttng error code. */ |
53a80697 MD |
418 | goto end; |
419 | } | |
65beb5ff DG |
420 | |
421 | /* Get header from data transmission */ | |
422 | ret = recv_data_sessiond(&llm, sizeof(llm)); | |
423 | if (ret < 0) { | |
2f70b271 | 424 | /* Ret value is a valid lttng error code. */ |
65beb5ff DG |
425 | goto end; |
426 | } | |
427 | ||
428 | /* Check error code if OK */ | |
f73fabfd | 429 | if (llm.ret_code != LTTNG_OK) { |
65beb5ff DG |
430 | ret = -llm.ret_code; |
431 | goto end; | |
432 | } | |
433 | ||
434 | size = llm.data_size; | |
435 | if (size == 0) { | |
874d3f84 | 436 | /* If client free with size 0 */ |
a45d5536 DG |
437 | if (buf != NULL) { |
438 | *buf = NULL; | |
439 | } | |
7d29a247 | 440 | ret = 0; |
65beb5ff DG |
441 | goto end; |
442 | } | |
443 | ||
444 | data = (void*) malloc(size); | |
445 | ||
446 | /* Get payload data */ | |
447 | ret = recv_data_sessiond(data, size); | |
448 | if (ret < 0) { | |
449 | free(data); | |
450 | goto end; | |
451 | } | |
452 | ||
83009e5e DG |
453 | /* |
454 | * Extra protection not to dereference a NULL pointer. If buf is NULL at | |
455 | * this point, an error is returned and data is freed. | |
456 | */ | |
457 | if (buf == NULL) { | |
2f70b271 | 458 | ret = -LTTNG_ERR_INVALID; |
83009e5e DG |
459 | free(data); |
460 | goto end; | |
461 | } | |
462 | ||
65beb5ff DG |
463 | *buf = data; |
464 | ret = size; | |
465 | ||
466 | end: | |
467 | disconnect_sessiond(); | |
468 | return ret; | |
469 | } | |
470 | ||
9f19cc17 | 471 | /* |
cd80958d | 472 | * Create lttng handle and return pointer. |
1c8d13c8 | 473 | * The returned pointer will be NULL in case of malloc() error. |
9f19cc17 | 474 | */ |
cd80958d DG |
475 | struct lttng_handle *lttng_create_handle(const char *session_name, |
476 | struct lttng_domain *domain) | |
9f19cc17 | 477 | { |
2f70b271 DG |
478 | struct lttng_handle *handle = NULL; |
479 | ||
480 | if (domain == NULL) { | |
481 | goto end; | |
482 | } | |
cd80958d DG |
483 | |
484 | handle = malloc(sizeof(struct lttng_handle)); | |
485 | if (handle == NULL) { | |
2f70b271 | 486 | PERROR("malloc handle"); |
cd80958d DG |
487 | goto end; |
488 | } | |
489 | ||
490 | /* Copy session name */ | |
cac3069d | 491 | lttng_ctl_copy_string(handle->session_name, session_name, |
cd80958d DG |
492 | sizeof(handle->session_name)); |
493 | ||
494 | /* Copy lttng domain */ | |
cac3069d | 495 | lttng_ctl_copy_lttng_domain(&handle->domain, domain); |
cd80958d DG |
496 | |
497 | end: | |
498 | return handle; | |
499 | } | |
500 | ||
501 | /* | |
502 | * Destroy handle by free(3) the pointer. | |
503 | */ | |
504 | void lttng_destroy_handle(struct lttng_handle *handle) | |
505 | { | |
0e428499 | 506 | free(handle); |
eb354453 DG |
507 | } |
508 | ||
d9800920 DG |
509 | /* |
510 | * Register an outside consumer. | |
1c8d13c8 | 511 | * Returns size of returned session payload data or a negative error code. |
d9800920 DG |
512 | */ |
513 | int lttng_register_consumer(struct lttng_handle *handle, | |
514 | const char *socket_path) | |
515 | { | |
516 | struct lttcomm_session_msg lsm; | |
517 | ||
2f70b271 DG |
518 | if (handle == NULL || socket_path == NULL) { |
519 | return -LTTNG_ERR_INVALID; | |
520 | } | |
521 | ||
d9800920 | 522 | lsm.cmd_type = LTTNG_REGISTER_CONSUMER; |
cac3069d | 523 | lttng_ctl_copy_string(lsm.session.name, handle->session_name, |
d9800920 | 524 | sizeof(lsm.session.name)); |
cac3069d | 525 | lttng_ctl_copy_lttng_domain(&lsm.domain, &handle->domain); |
d9800920 | 526 | |
cac3069d | 527 | lttng_ctl_copy_string(lsm.u.reg.path, socket_path, sizeof(lsm.u.reg.path)); |
d9800920 | 528 | |
cac3069d | 529 | return lttng_ctl_ask_sessiond(&lsm, NULL); |
d9800920 DG |
530 | } |
531 | ||
1df4dedd | 532 | /* |
1c8d13c8 TD |
533 | * Start tracing for all traces of the session. |
534 | * Returns size of returned session payload data or a negative error code. | |
1df4dedd | 535 | */ |
6a4f824d | 536 | int lttng_start_tracing(const char *session_name) |
f3ed775e | 537 | { |
cd80958d DG |
538 | struct lttcomm_session_msg lsm; |
539 | ||
6a4f824d | 540 | if (session_name == NULL) { |
2f70b271 | 541 | return -LTTNG_ERR_INVALID; |
cd80958d DG |
542 | } |
543 | ||
544 | lsm.cmd_type = LTTNG_START_TRACE; | |
6a4f824d | 545 | |
cac3069d DG |
546 | lttng_ctl_copy_string(lsm.session.name, session_name, |
547 | sizeof(lsm.session.name)); | |
cd80958d | 548 | |
cac3069d | 549 | return lttng_ctl_ask_sessiond(&lsm, NULL); |
f3ed775e | 550 | } |
1df4dedd DG |
551 | |
552 | /* | |
38ee087f | 553 | * Stop tracing for all traces of the session. |
f3ed775e | 554 | */ |
38ee087f | 555 | static int _lttng_stop_tracing(const char *session_name, int wait) |
f3ed775e | 556 | { |
38ee087f | 557 | int ret, data_ret; |
cd80958d DG |
558 | struct lttcomm_session_msg lsm; |
559 | ||
6a4f824d | 560 | if (session_name == NULL) { |
2f70b271 | 561 | return -LTTNG_ERR_INVALID; |
6a4f824d DG |
562 | } |
563 | ||
cd80958d | 564 | lsm.cmd_type = LTTNG_STOP_TRACE; |
6a4f824d | 565 | |
cac3069d DG |
566 | lttng_ctl_copy_string(lsm.session.name, session_name, |
567 | sizeof(lsm.session.name)); | |
cd80958d | 568 | |
cac3069d | 569 | ret = lttng_ctl_ask_sessiond(&lsm, NULL); |
38ee087f DG |
570 | if (ret < 0 && ret != -LTTNG_ERR_TRACE_ALREADY_STOPPED) { |
571 | goto error; | |
572 | } | |
573 | ||
574 | if (!wait) { | |
575 | goto end; | |
576 | } | |
577 | ||
578 | _MSG("Waiting for data availability"); | |
b7a81c24 | 579 | fflush(stdout); |
38ee087f DG |
580 | |
581 | /* Check for data availability */ | |
582 | do { | |
6d805429 | 583 | data_ret = lttng_data_pending(session_name); |
38ee087f DG |
584 | if (data_ret < 0) { |
585 | /* Return the data available call error. */ | |
586 | ret = data_ret; | |
587 | goto error; | |
588 | } | |
589 | ||
590 | /* | |
591 | * Data sleep time before retrying (in usec). Don't sleep if the call | |
592 | * returned value indicates availability. | |
593 | */ | |
6d805429 | 594 | if (data_ret) { |
38ee087f DG |
595 | usleep(DEFAULT_DATA_AVAILABILITY_WAIT_TIME); |
596 | _MSG("."); | |
b7a81c24 | 597 | fflush(stdout); |
38ee087f | 598 | } |
6d805429 | 599 | } while (data_ret != 0); |
38ee087f DG |
600 | |
601 | MSG(""); | |
602 | ||
603 | end: | |
604 | error: | |
605 | return ret; | |
606 | } | |
607 | ||
608 | /* | |
609 | * Stop tracing and wait for data availability. | |
610 | */ | |
611 | int lttng_stop_tracing(const char *session_name) | |
612 | { | |
613 | return _lttng_stop_tracing(session_name, 1); | |
614 | } | |
615 | ||
616 | /* | |
617 | * Stop tracing but _don't_ wait for data availability. | |
618 | */ | |
619 | int lttng_stop_tracing_no_wait(const char *session_name) | |
620 | { | |
621 | return _lttng_stop_tracing(session_name, 0); | |
f3ed775e DG |
622 | } |
623 | ||
624 | /* | |
601d5acf DG |
625 | * Add context to a channel. |
626 | * | |
627 | * If the given channel is NULL, add the contexts to all channels. | |
628 | * The event_name param is ignored. | |
af87c45a DG |
629 | * |
630 | * Returns the size of the returned payload data or a negative error code. | |
1df4dedd | 631 | */ |
cd80958d | 632 | int lttng_add_context(struct lttng_handle *handle, |
38057ed1 DG |
633 | struct lttng_event_context *ctx, const char *event_name, |
634 | const char *channel_name) | |
d65106b1 | 635 | { |
cd80958d DG |
636 | struct lttcomm_session_msg lsm; |
637 | ||
9d697d3d DG |
638 | /* Safety check. Both are mandatory */ |
639 | if (handle == NULL || ctx == NULL) { | |
2f70b271 | 640 | return -LTTNG_ERR_INVALID; |
cd80958d DG |
641 | } |
642 | ||
441c16a7 MD |
643 | memset(&lsm, 0, sizeof(lsm)); |
644 | ||
cd80958d DG |
645 | lsm.cmd_type = LTTNG_ADD_CONTEXT; |
646 | ||
85076754 MD |
647 | /* If no channel name, send empty string. */ |
648 | if (channel_name == NULL) { | |
649 | lttng_ctl_copy_string(lsm.u.context.channel_name, "", | |
650 | sizeof(lsm.u.context.channel_name)); | |
651 | } else { | |
652 | lttng_ctl_copy_string(lsm.u.context.channel_name, channel_name, | |
653 | sizeof(lsm.u.context.channel_name)); | |
654 | } | |
cd80958d | 655 | |
cac3069d | 656 | lttng_ctl_copy_lttng_domain(&lsm.domain, &handle->domain); |
d65106b1 | 657 | |
9d697d3d | 658 | memcpy(&lsm.u.context.ctx, ctx, sizeof(struct lttng_event_context)); |
d65106b1 | 659 | |
cac3069d | 660 | lttng_ctl_copy_string(lsm.session.name, handle->session_name, |
cd80958d DG |
661 | sizeof(lsm.session.name)); |
662 | ||
cac3069d | 663 | return lttng_ctl_ask_sessiond(&lsm, NULL); |
d65106b1 DG |
664 | } |
665 | ||
f3ed775e | 666 | /* |
1c8d13c8 TD |
667 | * Enable event(s) for a channel. |
668 | * If no event name is specified, all events are enabled. | |
669 | * If no channel name is specified, the default 'channel0' is used. | |
670 | * Returns size of returned session payload data or a negative error code. | |
f3ed775e | 671 | */ |
cd80958d | 672 | int lttng_enable_event(struct lttng_handle *handle, |
38057ed1 | 673 | struct lttng_event *ev, const char *channel_name) |
1df4dedd | 674 | { |
cd80958d DG |
675 | struct lttcomm_session_msg lsm; |
676 | ||
5117eeec | 677 | if (handle == NULL || ev == NULL) { |
2f70b271 | 678 | return -LTTNG_ERR_INVALID; |
cd80958d | 679 | } |
33a2b854 | 680 | |
441c16a7 MD |
681 | memset(&lsm, 0, sizeof(lsm)); |
682 | ||
85076754 | 683 | /* If no channel name, send empty string. */ |
94cf3c47 | 684 | if (channel_name == NULL) { |
85076754 | 685 | lttng_ctl_copy_string(lsm.u.enable.channel_name, "", |
cd80958d | 686 | sizeof(lsm.u.enable.channel_name)); |
33a2b854 | 687 | } else { |
cac3069d | 688 | lttng_ctl_copy_string(lsm.u.enable.channel_name, channel_name, |
cd80958d | 689 | sizeof(lsm.u.enable.channel_name)); |
eb354453 DG |
690 | } |
691 | ||
cac3069d | 692 | lttng_ctl_copy_lttng_domain(&lsm.domain, &handle->domain); |
0d0c377a | 693 | |
8c9ae521 | 694 | if (ev->name[0] != '\0') { |
cd80958d | 695 | lsm.cmd_type = LTTNG_ENABLE_EVENT; |
0d0c377a | 696 | } else { |
cd80958d | 697 | lsm.cmd_type = LTTNG_ENABLE_ALL_EVENT; |
f3ed775e | 698 | } |
8c9ae521 | 699 | memcpy(&lsm.u.enable.event, ev, sizeof(lsm.u.enable.event)); |
f3ed775e | 700 | |
cac3069d | 701 | lttng_ctl_copy_string(lsm.session.name, handle->session_name, |
cd80958d DG |
702 | sizeof(lsm.session.name)); |
703 | ||
cac3069d | 704 | return lttng_ctl_ask_sessiond(&lsm, NULL); |
1df4dedd DG |
705 | } |
706 | ||
53a80697 | 707 | /* |
025faf73 | 708 | * Create or enable an event with a filter expression. |
178191b3 | 709 | * |
53a80697 MD |
710 | * Return negative error value on error. |
711 | * Return size of returned session payload data if OK. | |
712 | */ | |
025faf73 | 713 | int lttng_enable_event_with_filter(struct lttng_handle *handle, |
178191b3 | 714 | struct lttng_event *event, const char *channel_name, |
53a80697 MD |
715 | const char *filter_expression) |
716 | { | |
717 | struct lttcomm_session_msg lsm; | |
718 | struct filter_parser_ctx *ctx; | |
719 | FILE *fmem; | |
720 | int ret = 0; | |
721 | ||
52df2401 MD |
722 | if (!filter_expression) { |
723 | /* | |
724 | * Fall back to normal event enabling if no filter | |
725 | * specified. | |
726 | */ | |
727 | return lttng_enable_event(handle, event, channel_name); | |
728 | } | |
729 | ||
730 | /* | |
731 | * Empty filter string will always be rejected by the parser | |
732 | * anyway, so treat this corner-case early to eliminate | |
733 | * lttng_fmemopen error for 0-byte allocation. | |
734 | */ | |
735 | if (handle == NULL || filter_expression[0] == '\0') { | |
2f70b271 | 736 | return -LTTNG_ERR_INVALID; |
53a80697 MD |
737 | } |
738 | ||
53a80697 MD |
739 | /* |
740 | * casting const to non-const, as the underlying function will | |
741 | * use it in read-only mode. | |
742 | */ | |
743 | fmem = lttng_fmemopen((void *) filter_expression, | |
744 | strlen(filter_expression), "r"); | |
745 | if (!fmem) { | |
746 | fprintf(stderr, "Error opening memory as stream\n"); | |
ff7ef7b8 | 747 | return -LTTNG_ERR_FILTER_NOMEM; |
53a80697 MD |
748 | } |
749 | ctx = filter_parser_ctx_alloc(fmem); | |
750 | if (!ctx) { | |
751 | fprintf(stderr, "Error allocating parser\n"); | |
ff7ef7b8 | 752 | ret = -LTTNG_ERR_FILTER_NOMEM; |
53a80697 MD |
753 | goto alloc_error; |
754 | } | |
755 | ret = filter_parser_ctx_append_ast(ctx); | |
756 | if (ret) { | |
757 | fprintf(stderr, "Parse error\n"); | |
ff7ef7b8 | 758 | ret = -LTTNG_ERR_FILTER_INVAL; |
53a80697 MD |
759 | goto parse_error; |
760 | } | |
761 | ret = filter_visitor_set_parent(ctx); | |
762 | if (ret) { | |
763 | fprintf(stderr, "Set parent error\n"); | |
ff7ef7b8 | 764 | ret = -LTTNG_ERR_FILTER_INVAL; |
53a80697 MD |
765 | goto parse_error; |
766 | } | |
767 | if (print_xml) { | |
768 | ret = filter_visitor_print_xml(ctx, stdout, 0); | |
769 | if (ret) { | |
770 | fflush(stdout); | |
771 | fprintf(stderr, "XML print error\n"); | |
ff7ef7b8 | 772 | ret = -LTTNG_ERR_FILTER_INVAL; |
53a80697 MD |
773 | goto parse_error; |
774 | } | |
775 | } | |
776 | ||
777 | dbg_printf("Generating IR... "); | |
778 | fflush(stdout); | |
779 | ret = filter_visitor_ir_generate(ctx); | |
780 | if (ret) { | |
781 | fprintf(stderr, "Generate IR error\n"); | |
ff7ef7b8 | 782 | ret = -LTTNG_ERR_FILTER_INVAL; |
53a80697 MD |
783 | goto parse_error; |
784 | } | |
785 | dbg_printf("done\n"); | |
786 | ||
787 | dbg_printf("Validating IR... "); | |
788 | fflush(stdout); | |
789 | ret = filter_visitor_ir_check_binary_op_nesting(ctx); | |
790 | if (ret) { | |
ff7ef7b8 | 791 | ret = -LTTNG_ERR_FILTER_INVAL; |
53a80697 MD |
792 | goto parse_error; |
793 | } | |
794 | dbg_printf("done\n"); | |
795 | ||
796 | dbg_printf("Generating bytecode... "); | |
797 | fflush(stdout); | |
798 | ret = filter_visitor_bytecode_generate(ctx); | |
799 | if (ret) { | |
800 | fprintf(stderr, "Generate bytecode error\n"); | |
ff7ef7b8 | 801 | ret = -LTTNG_ERR_FILTER_INVAL; |
53a80697 MD |
802 | goto parse_error; |
803 | } | |
804 | dbg_printf("done\n"); | |
805 | dbg_printf("Size of bytecode generated: %u bytes.\n", | |
806 | bytecode_get_len(&ctx->bytecode->b)); | |
807 | ||
808 | memset(&lsm, 0, sizeof(lsm)); | |
809 | ||
025faf73 | 810 | lsm.cmd_type = LTTNG_ENABLE_EVENT_WITH_FILTER; |
53a80697 | 811 | |
85076754 MD |
812 | /* If no channel name, send empty string. */ |
813 | if (channel_name == NULL) { | |
814 | lttng_ctl_copy_string(lsm.u.enable.channel_name, "", | |
815 | sizeof(lsm.u.enable.channel_name)); | |
816 | } else { | |
817 | lttng_ctl_copy_string(lsm.u.enable.channel_name, channel_name, | |
818 | sizeof(lsm.u.enable.channel_name)); | |
819 | } | |
820 | ||
53a80697 | 821 | /* Copy event name */ |
178191b3 DG |
822 | if (event) { |
823 | memcpy(&lsm.u.enable.event, event, sizeof(lsm.u.enable.event)); | |
824 | } | |
825 | ||
025faf73 | 826 | lsm.u.enable.bytecode_len = sizeof(ctx->bytecode->b) |
53a80697 MD |
827 | + bytecode_get_len(&ctx->bytecode->b); |
828 | ||
cac3069d | 829 | lttng_ctl_copy_lttng_domain(&lsm.domain, &handle->domain); |
53a80697 | 830 | |
cac3069d | 831 | lttng_ctl_copy_string(lsm.session.name, handle->session_name, |
53a80697 MD |
832 | sizeof(lsm.session.name)); |
833 | ||
cac3069d | 834 | ret = lttng_ctl_ask_sessiond_varlen(&lsm, &ctx->bytecode->b, |
025faf73 | 835 | lsm.u.enable.bytecode_len, NULL); |
53a80697 MD |
836 | |
837 | filter_bytecode_free(ctx); | |
838 | filter_ir_free(ctx); | |
839 | filter_parser_ctx_free(ctx); | |
840 | if (fclose(fmem) != 0) { | |
841 | perror("fclose"); | |
842 | } | |
843 | return ret; | |
844 | ||
845 | parse_error: | |
846 | filter_bytecode_free(ctx); | |
847 | filter_ir_free(ctx); | |
848 | filter_parser_ctx_free(ctx); | |
849 | alloc_error: | |
850 | if (fclose(fmem) != 0) { | |
851 | perror("fclose"); | |
852 | } | |
853 | return ret; | |
854 | } | |
855 | ||
1df4dedd | 856 | /* |
1c8d13c8 TD |
857 | * Disable event(s) of a channel and domain. |
858 | * If no event name is specified, all events are disabled. | |
859 | * If no channel name is specified, the default 'channel0' is used. | |
860 | * Returns size of returned session payload data or a negative error code. | |
1df4dedd | 861 | */ |
cd80958d | 862 | int lttng_disable_event(struct lttng_handle *handle, const char *name, |
38057ed1 | 863 | const char *channel_name) |
1df4dedd | 864 | { |
cd80958d | 865 | struct lttcomm_session_msg lsm; |
1df4dedd | 866 | |
9d697d3d | 867 | if (handle == NULL) { |
2f70b271 | 868 | return -LTTNG_ERR_INVALID; |
cd80958d DG |
869 | } |
870 | ||
441c16a7 MD |
871 | memset(&lsm, 0, sizeof(lsm)); |
872 | ||
85076754 MD |
873 | /* If no channel name, send empty string. */ |
874 | if (channel_name == NULL) { | |
875 | lttng_ctl_copy_string(lsm.u.disable.channel_name, "", | |
cd80958d | 876 | sizeof(lsm.u.disable.channel_name)); |
f3ed775e | 877 | } else { |
85076754 | 878 | lttng_ctl_copy_string(lsm.u.disable.channel_name, channel_name, |
cd80958d | 879 | sizeof(lsm.u.disable.channel_name)); |
eb354453 DG |
880 | } |
881 | ||
cac3069d | 882 | lttng_ctl_copy_lttng_domain(&lsm.domain, &handle->domain); |
f5177a38 | 883 | |
f84efadf | 884 | if (name != NULL) { |
cac3069d DG |
885 | lttng_ctl_copy_string(lsm.u.disable.name, name, |
886 | sizeof(lsm.u.disable.name)); | |
cd80958d | 887 | lsm.cmd_type = LTTNG_DISABLE_EVENT; |
f5177a38 | 888 | } else { |
cd80958d | 889 | lsm.cmd_type = LTTNG_DISABLE_ALL_EVENT; |
f3ed775e DG |
890 | } |
891 | ||
cac3069d | 892 | lttng_ctl_copy_string(lsm.session.name, handle->session_name, |
cd80958d DG |
893 | sizeof(lsm.session.name)); |
894 | ||
cac3069d | 895 | return lttng_ctl_ask_sessiond(&lsm, NULL); |
1df4dedd DG |
896 | } |
897 | ||
898 | /* | |
1c8d13c8 TD |
899 | * Enable channel per domain |
900 | * Returns size of returned session payload data or a negative error code. | |
a5c5a2bd | 901 | */ |
cd80958d | 902 | int lttng_enable_channel(struct lttng_handle *handle, |
38057ed1 | 903 | struct lttng_channel *chan) |
a5c5a2bd | 904 | { |
cd80958d DG |
905 | struct lttcomm_session_msg lsm; |
906 | ||
5117eeec DG |
907 | /* |
908 | * NULL arguments are forbidden. No default values. | |
909 | */ | |
910 | if (handle == NULL || chan == NULL) { | |
2f70b271 | 911 | return -LTTNG_ERR_INVALID; |
cd80958d DG |
912 | } |
913 | ||
441c16a7 MD |
914 | memset(&lsm, 0, sizeof(lsm)); |
915 | ||
5117eeec | 916 | memcpy(&lsm.u.channel.chan, chan, sizeof(lsm.u.channel.chan)); |
7d29a247 | 917 | |
cd80958d DG |
918 | lsm.cmd_type = LTTNG_ENABLE_CHANNEL; |
919 | ||
cac3069d | 920 | lttng_ctl_copy_lttng_domain(&lsm.domain, &handle->domain); |
7d29a247 | 921 | |
cac3069d | 922 | lttng_ctl_copy_string(lsm.session.name, handle->session_name, |
cd80958d DG |
923 | sizeof(lsm.session.name)); |
924 | ||
cac3069d | 925 | return lttng_ctl_ask_sessiond(&lsm, NULL); |
8c0faa1d | 926 | } |
1df4dedd | 927 | |
2ef84c95 | 928 | /* |
1c8d13c8 TD |
929 | * All tracing will be stopped for registered events of the channel. |
930 | * Returns size of returned session payload data or a negative error code. | |
2ef84c95 | 931 | */ |
cd80958d | 932 | int lttng_disable_channel(struct lttng_handle *handle, const char *name) |
2ef84c95 | 933 | { |
cd80958d DG |
934 | struct lttcomm_session_msg lsm; |
935 | ||
9d697d3d DG |
936 | /* Safety check. Both are mandatory */ |
937 | if (handle == NULL || name == NULL) { | |
2f70b271 | 938 | return -LTTNG_ERR_INVALID; |
cd80958d DG |
939 | } |
940 | ||
441c16a7 MD |
941 | memset(&lsm, 0, sizeof(lsm)); |
942 | ||
cd80958d | 943 | lsm.cmd_type = LTTNG_DISABLE_CHANNEL; |
1df4dedd | 944 | |
cac3069d | 945 | lttng_ctl_copy_string(lsm.u.disable.channel_name, name, |
9d697d3d DG |
946 | sizeof(lsm.u.disable.channel_name)); |
947 | ||
cac3069d | 948 | lttng_ctl_copy_lttng_domain(&lsm.domain, &handle->domain); |
cd80958d | 949 | |
cac3069d | 950 | lttng_ctl_copy_string(lsm.session.name, handle->session_name, |
cd80958d DG |
951 | sizeof(lsm.session.name)); |
952 | ||
cac3069d | 953 | return lttng_ctl_ask_sessiond(&lsm, NULL); |
ca95a216 DG |
954 | } |
955 | ||
fac6795d | 956 | /* |
1c8d13c8 TD |
957 | * Lists all available tracepoints of domain. |
958 | * Sets the contents of the events array. | |
959 | * Returns the number of lttng_event entries in events; | |
960 | * on error, returns a negative value. | |
fac6795d | 961 | */ |
cd80958d | 962 | int lttng_list_tracepoints(struct lttng_handle *handle, |
2a71efd5 | 963 | struct lttng_event **events) |
fac6795d | 964 | { |
052da939 | 965 | int ret; |
cd80958d DG |
966 | struct lttcomm_session_msg lsm; |
967 | ||
9d697d3d | 968 | if (handle == NULL) { |
2f70b271 | 969 | return -LTTNG_ERR_INVALID; |
cd80958d | 970 | } |
fac6795d | 971 | |
cd80958d | 972 | lsm.cmd_type = LTTNG_LIST_TRACEPOINTS; |
cac3069d | 973 | lttng_ctl_copy_lttng_domain(&lsm.domain, &handle->domain); |
2a71efd5 | 974 | |
cac3069d | 975 | ret = lttng_ctl_ask_sessiond(&lsm, (void **) events); |
052da939 DG |
976 | if (ret < 0) { |
977 | return ret; | |
eb354453 | 978 | } |
fac6795d | 979 | |
9f19cc17 | 980 | return ret / sizeof(struct lttng_event); |
fac6795d DG |
981 | } |
982 | ||
f37d259d MD |
983 | /* |
984 | * Lists all available tracepoint fields of domain. | |
985 | * Sets the contents of the event field array. | |
986 | * Returns the number of lttng_event_field entries in events; | |
987 | * on error, returns a negative value. | |
988 | */ | |
989 | int lttng_list_tracepoint_fields(struct lttng_handle *handle, | |
990 | struct lttng_event_field **fields) | |
991 | { | |
992 | int ret; | |
993 | struct lttcomm_session_msg lsm; | |
994 | ||
995 | if (handle == NULL) { | |
2f70b271 | 996 | return -LTTNG_ERR_INVALID; |
f37d259d MD |
997 | } |
998 | ||
999 | lsm.cmd_type = LTTNG_LIST_TRACEPOINT_FIELDS; | |
cac3069d | 1000 | lttng_ctl_copy_lttng_domain(&lsm.domain, &handle->domain); |
f37d259d | 1001 | |
cac3069d | 1002 | ret = lttng_ctl_ask_sessiond(&lsm, (void **) fields); |
f37d259d MD |
1003 | if (ret < 0) { |
1004 | return ret; | |
1005 | } | |
1006 | ||
1007 | return ret / sizeof(struct lttng_event_field); | |
1008 | } | |
1009 | ||
1657e9bb | 1010 | /* |
1c8d13c8 TD |
1011 | * Returns a human readable string describing |
1012 | * the error code (a negative value). | |
1657e9bb | 1013 | */ |
9a745bc7 | 1014 | const char *lttng_strerror(int code) |
1657e9bb | 1015 | { |
f73fabfd | 1016 | return error_get_str(code); |
1657e9bb DG |
1017 | } |
1018 | ||
aaf97519 | 1019 | /* |
a4b92340 DG |
1020 | * Create a brand new session using name and url for destination. |
1021 | * | |
f73fabfd | 1022 | * Returns LTTNG_OK on success or a negative error code. |
00e2e675 | 1023 | */ |
a4b92340 | 1024 | int lttng_create_session(const char *name, const char *url) |
00e2e675 | 1025 | { |
3dd05a85 | 1026 | int ret; |
a4b92340 | 1027 | ssize_t size; |
00e2e675 | 1028 | struct lttcomm_session_msg lsm; |
a4b92340 | 1029 | struct lttng_uri *uris = NULL; |
00e2e675 | 1030 | |
a4b92340 | 1031 | if (name == NULL) { |
2f70b271 | 1032 | return -LTTNG_ERR_INVALID; |
00e2e675 DG |
1033 | } |
1034 | ||
a4b92340 | 1035 | memset(&lsm, 0, sizeof(lsm)); |
00e2e675 | 1036 | |
a4b92340 | 1037 | lsm.cmd_type = LTTNG_CREATE_SESSION; |
cac3069d | 1038 | lttng_ctl_copy_string(lsm.session.name, name, sizeof(lsm.session.name)); |
a4b92340 DG |
1039 | |
1040 | /* There should never be a data URL */ | |
bc894455 | 1041 | size = uri_parse_str_urls(url, NULL, &uris); |
a4b92340 | 1042 | if (size < 0) { |
2f70b271 | 1043 | return -LTTNG_ERR_INVALID; |
00e2e675 DG |
1044 | } |
1045 | ||
a4b92340 DG |
1046 | lsm.u.uri.size = size; |
1047 | ||
cac3069d DG |
1048 | ret = lttng_ctl_ask_sessiond_varlen(&lsm, uris, |
1049 | sizeof(struct lttng_uri) * size, NULL); | |
3dd05a85 DG |
1050 | |
1051 | free(uris); | |
1052 | return ret; | |
00e2e675 DG |
1053 | } |
1054 | ||
8028d920 | 1055 | /* |
8028d920 | 1056 | * Destroy session using name. |
1c8d13c8 | 1057 | * Returns size of returned session payload data or a negative error code. |
8028d920 | 1058 | */ |
843f5df9 | 1059 | int lttng_destroy_session(const char *session_name) |
8028d920 | 1060 | { |
cd80958d DG |
1061 | struct lttcomm_session_msg lsm; |
1062 | ||
843f5df9 | 1063 | if (session_name == NULL) { |
2f70b271 | 1064 | return -LTTNG_ERR_INVALID; |
cd80958d DG |
1065 | } |
1066 | ||
1067 | lsm.cmd_type = LTTNG_DESTROY_SESSION; | |
843f5df9 | 1068 | |
cac3069d DG |
1069 | lttng_ctl_copy_string(lsm.session.name, session_name, |
1070 | sizeof(lsm.session.name)); | |
cd80958d | 1071 | |
cac3069d | 1072 | return lttng_ctl_ask_sessiond(&lsm, NULL); |
aaf97519 DG |
1073 | } |
1074 | ||
57167058 | 1075 | /* |
57167058 | 1076 | * Ask the session daemon for all available sessions. |
1c8d13c8 TD |
1077 | * Sets the contents of the sessions array. |
1078 | * Returns the number of lttng_session entries in sessions; | |
1079 | * on error, returns a negative value. | |
57167058 | 1080 | */ |
ca95a216 | 1081 | int lttng_list_sessions(struct lttng_session **sessions) |
57167058 | 1082 | { |
ca95a216 | 1083 | int ret; |
cd80958d | 1084 | struct lttcomm_session_msg lsm; |
57167058 | 1085 | |
cd80958d | 1086 | lsm.cmd_type = LTTNG_LIST_SESSIONS; |
cac3069d | 1087 | ret = lttng_ctl_ask_sessiond(&lsm, (void**) sessions); |
57167058 | 1088 | if (ret < 0) { |
ca95a216 | 1089 | return ret; |
57167058 DG |
1090 | } |
1091 | ||
ca95a216 | 1092 | return ret / sizeof(struct lttng_session); |
57167058 DG |
1093 | } |
1094 | ||
9f19cc17 | 1095 | /* |
1c8d13c8 TD |
1096 | * Ask the session daemon for all available domains of a session. |
1097 | * Sets the contents of the domains array. | |
1098 | * Returns the number of lttng_domain entries in domains; | |
1099 | * on error, returns a negative value. | |
9f19cc17 | 1100 | */ |
330be774 | 1101 | int lttng_list_domains(const char *session_name, |
cd80958d | 1102 | struct lttng_domain **domains) |
9f19cc17 DG |
1103 | { |
1104 | int ret; | |
cd80958d DG |
1105 | struct lttcomm_session_msg lsm; |
1106 | ||
330be774 | 1107 | if (session_name == NULL) { |
2f70b271 | 1108 | return -LTTNG_ERR_INVALID; |
cd80958d | 1109 | } |
9f19cc17 | 1110 | |
cd80958d DG |
1111 | lsm.cmd_type = LTTNG_LIST_DOMAINS; |
1112 | ||
cac3069d DG |
1113 | lttng_ctl_copy_string(lsm.session.name, session_name, |
1114 | sizeof(lsm.session.name)); | |
cd80958d | 1115 | |
cac3069d | 1116 | ret = lttng_ctl_ask_sessiond(&lsm, (void**) domains); |
9f19cc17 DG |
1117 | if (ret < 0) { |
1118 | return ret; | |
1119 | } | |
1120 | ||
1121 | return ret / sizeof(struct lttng_domain); | |
1122 | } | |
1123 | ||
1124 | /* | |
1c8d13c8 TD |
1125 | * Ask the session daemon for all available channels of a session. |
1126 | * Sets the contents of the channels array. | |
1127 | * Returns the number of lttng_channel entries in channels; | |
1128 | * on error, returns a negative value. | |
9f19cc17 | 1129 | */ |
cd80958d DG |
1130 | int lttng_list_channels(struct lttng_handle *handle, |
1131 | struct lttng_channel **channels) | |
9f19cc17 DG |
1132 | { |
1133 | int ret; | |
cd80958d DG |
1134 | struct lttcomm_session_msg lsm; |
1135 | ||
9d697d3d | 1136 | if (handle == NULL) { |
2f70b271 | 1137 | return -LTTNG_ERR_INVALID; |
cd80958d DG |
1138 | } |
1139 | ||
1140 | lsm.cmd_type = LTTNG_LIST_CHANNELS; | |
cac3069d | 1141 | lttng_ctl_copy_string(lsm.session.name, handle->session_name, |
cd80958d | 1142 | sizeof(lsm.session.name)); |
9f19cc17 | 1143 | |
cac3069d | 1144 | lttng_ctl_copy_lttng_domain(&lsm.domain, &handle->domain); |
9f19cc17 | 1145 | |
cac3069d | 1146 | ret = lttng_ctl_ask_sessiond(&lsm, (void**) channels); |
9f19cc17 DG |
1147 | if (ret < 0) { |
1148 | return ret; | |
1149 | } | |
1150 | ||
1151 | return ret / sizeof(struct lttng_channel); | |
1152 | } | |
1153 | ||
1154 | /* | |
1c8d13c8 TD |
1155 | * Ask the session daemon for all available events of a session channel. |
1156 | * Sets the contents of the events array. | |
1157 | * Returns the number of lttng_event entries in events; | |
1158 | * on error, returns a negative value. | |
9f19cc17 | 1159 | */ |
cd80958d DG |
1160 | int lttng_list_events(struct lttng_handle *handle, |
1161 | const char *channel_name, struct lttng_event **events) | |
9f19cc17 DG |
1162 | { |
1163 | int ret; | |
cd80958d | 1164 | struct lttcomm_session_msg lsm; |
9f19cc17 | 1165 | |
9d697d3d DG |
1166 | /* Safety check. An handle and channel name are mandatory */ |
1167 | if (handle == NULL || channel_name == NULL) { | |
2f70b271 | 1168 | return -LTTNG_ERR_INVALID; |
cd80958d DG |
1169 | } |
1170 | ||
1171 | lsm.cmd_type = LTTNG_LIST_EVENTS; | |
cac3069d | 1172 | lttng_ctl_copy_string(lsm.session.name, handle->session_name, |
cd80958d | 1173 | sizeof(lsm.session.name)); |
cac3069d | 1174 | lttng_ctl_copy_string(lsm.u.list.channel_name, channel_name, |
cd80958d DG |
1175 | sizeof(lsm.u.list.channel_name)); |
1176 | ||
cac3069d | 1177 | lttng_ctl_copy_lttng_domain(&lsm.domain, &handle->domain); |
9f19cc17 | 1178 | |
cac3069d | 1179 | ret = lttng_ctl_ask_sessiond(&lsm, (void**) events); |
9f19cc17 DG |
1180 | if (ret < 0) { |
1181 | return ret; | |
1182 | } | |
1183 | ||
1184 | return ret / sizeof(struct lttng_event); | |
1185 | } | |
1186 | ||
fac6795d | 1187 | /* |
1c8d13c8 TD |
1188 | * Sets the tracing_group variable with name. |
1189 | * This function allocates memory pointed to by tracing_group. | |
1190 | * On success, returns 0, on error, returns -1 (null name) or -ENOMEM. | |
fac6795d DG |
1191 | */ |
1192 | int lttng_set_tracing_group(const char *name) | |
1193 | { | |
9d697d3d | 1194 | if (name == NULL) { |
2f70b271 | 1195 | return -LTTNG_ERR_INVALID; |
9d697d3d DG |
1196 | } |
1197 | ||
fac6795d | 1198 | if (asprintf(&tracing_group, "%s", name) < 0) { |
2f70b271 | 1199 | return -LTTNG_ERR_FATAL; |
fac6795d DG |
1200 | } |
1201 | ||
1202 | return 0; | |
1203 | } | |
1204 | ||
d0254c7c | 1205 | /* |
af87c45a | 1206 | * Returns size of returned session payload data or a negative error code. |
d0254c7c | 1207 | */ |
cd80958d | 1208 | int lttng_calibrate(struct lttng_handle *handle, |
d0254c7c MD |
1209 | struct lttng_calibrate *calibrate) |
1210 | { | |
cd80958d | 1211 | struct lttcomm_session_msg lsm; |
d0254c7c | 1212 | |
9d697d3d DG |
1213 | /* Safety check. NULL pointer are forbidden */ |
1214 | if (handle == NULL || calibrate == NULL) { | |
2f70b271 | 1215 | return -LTTNG_ERR_INVALID; |
cd80958d | 1216 | } |
d0254c7c | 1217 | |
cd80958d | 1218 | lsm.cmd_type = LTTNG_CALIBRATE; |
cac3069d | 1219 | lttng_ctl_copy_lttng_domain(&lsm.domain, &handle->domain); |
d0254c7c | 1220 | |
cd80958d DG |
1221 | memcpy(&lsm.u.calibrate, calibrate, sizeof(lsm.u.calibrate)); |
1222 | ||
cac3069d | 1223 | return lttng_ctl_ask_sessiond(&lsm, NULL); |
d0254c7c MD |
1224 | } |
1225 | ||
5edd7e09 DG |
1226 | /* |
1227 | * Set default channel attributes. | |
441c16a7 | 1228 | * If either or both of the arguments are null, attr content is zeroe'd. |
5edd7e09 DG |
1229 | */ |
1230 | void lttng_channel_set_default_attr(struct lttng_domain *domain, | |
1231 | struct lttng_channel_attr *attr) | |
1232 | { | |
1233 | /* Safety check */ | |
1234 | if (attr == NULL || domain == NULL) { | |
1235 | return; | |
1236 | } | |
1237 | ||
eacaa7a6 DS |
1238 | memset(attr, 0, sizeof(struct lttng_channel_attr)); |
1239 | ||
0a9c6494 DG |
1240 | /* Same for all domains. */ |
1241 | attr->overwrite = DEFAULT_CHANNEL_OVERWRITE; | |
1242 | attr->tracefile_size = DEFAULT_CHANNEL_TRACEFILE_SIZE; | |
1243 | attr->tracefile_count = DEFAULT_CHANNEL_TRACEFILE_COUNT; | |
1244 | ||
5edd7e09 DG |
1245 | switch (domain->type) { |
1246 | case LTTNG_DOMAIN_KERNEL: | |
d92ff3ef DG |
1247 | attr->switch_timer_interval = DEFAULT_KERNEL_CHANNEL_SWITCH_TIMER; |
1248 | attr->read_timer_interval = DEFAULT_KERNEL_CHANNEL_READ_TIMER; | |
3e230f92 | 1249 | attr->subbuf_size = default_get_kernel_channel_subbuf_size(); |
5edd7e09 DG |
1250 | attr->num_subbuf = DEFAULT_KERNEL_CHANNEL_SUBBUF_NUM; |
1251 | attr->output = DEFAULT_KERNEL_CHANNEL_OUTPUT; | |
1252 | break; | |
1253 | case LTTNG_DOMAIN_UST: | |
0a9c6494 DG |
1254 | switch (domain->buf_type) { |
1255 | case LTTNG_BUFFER_PER_UID: | |
1256 | attr->subbuf_size = default_get_ust_uid_channel_subbuf_size(); | |
1257 | attr->num_subbuf = DEFAULT_UST_UID_CHANNEL_SUBBUF_NUM; | |
1258 | attr->output = DEFAULT_UST_UID_CHANNEL_OUTPUT; | |
1259 | attr->switch_timer_interval = DEFAULT_UST_UID_CHANNEL_SWITCH_TIMER; | |
1260 | attr->read_timer_interval = DEFAULT_UST_UID_CHANNEL_READ_TIMER; | |
1261 | break; | |
1262 | case LTTNG_BUFFER_PER_PID: | |
1263 | default: | |
1264 | attr->subbuf_size = default_get_ust_pid_channel_subbuf_size(); | |
1265 | attr->num_subbuf = DEFAULT_UST_PID_CHANNEL_SUBBUF_NUM; | |
1266 | attr->output = DEFAULT_UST_PID_CHANNEL_OUTPUT; | |
1267 | attr->switch_timer_interval = DEFAULT_UST_PID_CHANNEL_SWITCH_TIMER; | |
1268 | attr->read_timer_interval = DEFAULT_UST_PID_CHANNEL_READ_TIMER; | |
1269 | break; | |
1270 | } | |
5edd7e09 | 1271 | default: |
441c16a7 | 1272 | /* Default behavior: leave set to 0. */ |
5edd7e09 DG |
1273 | break; |
1274 | } | |
1275 | } | |
1276 | ||
fac6795d | 1277 | /* |
2269e89e | 1278 | * Check if session daemon is alive. |
fac6795d | 1279 | * |
2269e89e | 1280 | * Return 1 if alive or 0 if not. |
1c8d13c8 | 1281 | * On error returns a negative value. |
fac6795d | 1282 | */ |
947308c4 | 1283 | int lttng_session_daemon_alive(void) |
fac6795d DG |
1284 | { |
1285 | int ret; | |
1286 | ||
1287 | ret = set_session_daemon_path(); | |
1288 | if (ret < 0) { | |
947308c4 | 1289 | /* Error */ |
fac6795d DG |
1290 | return ret; |
1291 | } | |
1292 | ||
9d035200 | 1293 | if (*sessiond_sock_path == '\0') { |
2f70b271 DG |
1294 | /* |
1295 | * No socket path set. Weird error which means the constructor was not | |
1296 | * called. | |
1297 | */ | |
1298 | assert(0); | |
fac6795d DG |
1299 | } |
1300 | ||
2269e89e | 1301 | ret = try_connect_sessiond(sessiond_sock_path); |
7d8234d9 MD |
1302 | if (ret < 0) { |
1303 | /* Not alive */ | |
1304 | return 0; | |
1305 | } | |
7d8234d9 | 1306 | |
947308c4 DG |
1307 | /* Is alive */ |
1308 | return 1; | |
fac6795d DG |
1309 | } |
1310 | ||
00e2e675 | 1311 | /* |
a4b92340 | 1312 | * Set URL for a consumer for a session and domain. |
00e2e675 DG |
1313 | * |
1314 | * Return 0 on success, else a negative value. | |
1315 | */ | |
a4b92340 DG |
1316 | int lttng_set_consumer_url(struct lttng_handle *handle, |
1317 | const char *control_url, const char *data_url) | |
00e2e675 | 1318 | { |
3dd05a85 | 1319 | int ret; |
a4b92340 | 1320 | ssize_t size; |
00e2e675 | 1321 | struct lttcomm_session_msg lsm; |
a4b92340 | 1322 | struct lttng_uri *uris = NULL; |
00e2e675 | 1323 | |
a4b92340 | 1324 | if (handle == NULL || (control_url == NULL && data_url == NULL)) { |
2f70b271 | 1325 | return -LTTNG_ERR_INVALID; |
00e2e675 DG |
1326 | } |
1327 | ||
a4b92340 DG |
1328 | memset(&lsm, 0, sizeof(lsm)); |
1329 | ||
00e2e675 DG |
1330 | lsm.cmd_type = LTTNG_SET_CONSUMER_URI; |
1331 | ||
cac3069d | 1332 | lttng_ctl_copy_string(lsm.session.name, handle->session_name, |
00e2e675 | 1333 | sizeof(lsm.session.name)); |
cac3069d | 1334 | lttng_ctl_copy_lttng_domain(&lsm.domain, &handle->domain); |
00e2e675 | 1335 | |
bc894455 | 1336 | size = uri_parse_str_urls(control_url, data_url, &uris); |
a4b92340 | 1337 | if (size < 0) { |
2f70b271 | 1338 | return -LTTNG_ERR_INVALID; |
a4b92340 DG |
1339 | } |
1340 | ||
1341 | lsm.u.uri.size = size; | |
00e2e675 | 1342 | |
cac3069d DG |
1343 | ret = lttng_ctl_ask_sessiond_varlen(&lsm, uris, |
1344 | sizeof(struct lttng_uri) * size, NULL); | |
3dd05a85 DG |
1345 | |
1346 | free(uris); | |
1347 | return ret; | |
00e2e675 DG |
1348 | } |
1349 | ||
1350 | /* | |
9c6bda17 | 1351 | * [OBSOLETE] |
00e2e675 DG |
1352 | */ |
1353 | int lttng_enable_consumer(struct lttng_handle *handle) | |
1354 | { | |
785d2d0d | 1355 | return -ENOSYS; |
00e2e675 DG |
1356 | } |
1357 | ||
1358 | /* | |
9c6bda17 | 1359 | * [OBSOLETE] |
00e2e675 DG |
1360 | */ |
1361 | int lttng_disable_consumer(struct lttng_handle *handle) | |
1362 | { | |
785d2d0d | 1363 | return -ENOSYS; |
00e2e675 DG |
1364 | } |
1365 | ||
07424f16 DG |
1366 | /* |
1367 | * This is an extension of create session that is ONLY and SHOULD only be used | |
1368 | * by the lttng command line program. It exists to avoid using URI parsing in | |
1369 | * the lttng client. | |
1370 | * | |
1371 | * We need the date and time for the trace path subdirectory for the case where | |
1372 | * the user does NOT define one using either -o or -U. Using the normal | |
1373 | * lttng_create_session API call, we have no clue on the session daemon side if | |
1374 | * the URL was generated automatically by the client or define by the user. | |
1375 | * | |
1376 | * So this function "wrapper" is hidden from the public API, takes the datetime | |
1377 | * string and appends it if necessary to the URI subdirectory before sending it | |
1378 | * to the session daemon. | |
1379 | * | |
1380 | * With this extra function, the lttng_create_session call behavior is not | |
1381 | * changed and the timestamp is appended to the URI on the session daemon side | |
1382 | * if necessary. | |
1383 | */ | |
1384 | int _lttng_create_session_ext(const char *name, const char *url, | |
1385 | const char *datetime) | |
1386 | { | |
3dd05a85 | 1387 | int ret; |
07424f16 DG |
1388 | ssize_t size; |
1389 | struct lttcomm_session_msg lsm; | |
1390 | struct lttng_uri *uris = NULL; | |
1391 | ||
2bba9e53 | 1392 | if (name == NULL || datetime == NULL) { |
2f70b271 | 1393 | return -LTTNG_ERR_INVALID; |
07424f16 DG |
1394 | } |
1395 | ||
1396 | memset(&lsm, 0, sizeof(lsm)); | |
1397 | ||
1398 | lsm.cmd_type = LTTNG_CREATE_SESSION; | |
cac3069d | 1399 | lttng_ctl_copy_string(lsm.session.name, name, sizeof(lsm.session.name)); |
07424f16 DG |
1400 | |
1401 | /* There should never be a data URL */ | |
bc894455 | 1402 | size = uri_parse_str_urls(url, NULL, &uris); |
07424f16 | 1403 | if (size < 0) { |
3dd05a85 DG |
1404 | ret = -LTTNG_ERR_INVALID; |
1405 | goto error; | |
07424f16 DG |
1406 | } |
1407 | ||
1408 | lsm.u.uri.size = size; | |
1409 | ||
4b35a6b3 | 1410 | if (size > 0 && uris[0].dtype != LTTNG_DST_PATH && strlen(uris[0].subdir) == 0) { |
da4aa2b8 DG |
1411 | /* Don't append datetime if the name was automatically created. */ |
1412 | if (strncmp(name, DEFAULT_SESSION_NAME "-", | |
1413 | strlen(DEFAULT_SESSION_NAME) + 1)) { | |
1414 | ret = snprintf(uris[0].subdir, sizeof(uris[0].subdir), "%s-%s", | |
1415 | name, datetime); | |
1416 | } else { | |
1417 | ret = snprintf(uris[0].subdir, sizeof(uris[0].subdir), "%s", name); | |
1418 | } | |
07424f16 DG |
1419 | if (ret < 0) { |
1420 | PERROR("snprintf uri subdir"); | |
3dd05a85 DG |
1421 | ret = -LTTNG_ERR_FATAL; |
1422 | goto error; | |
07424f16 DG |
1423 | } |
1424 | } | |
1425 | ||
cac3069d DG |
1426 | ret = lttng_ctl_ask_sessiond_varlen(&lsm, uris, |
1427 | sizeof(struct lttng_uri) * size, NULL); | |
3dd05a85 DG |
1428 | |
1429 | error: | |
1430 | free(uris); | |
1431 | return ret; | |
07424f16 DG |
1432 | } |
1433 | ||
806e2684 DG |
1434 | /* |
1435 | * For a given session name, this call checks if the data is ready to be read | |
1436 | * or is still being extracted by the consumer(s) hence not ready to be used by | |
1437 | * any readers. | |
1438 | */ | |
6d805429 | 1439 | int lttng_data_pending(const char *session_name) |
806e2684 DG |
1440 | { |
1441 | int ret; | |
1442 | struct lttcomm_session_msg lsm; | |
1443 | ||
1444 | if (session_name == NULL) { | |
1445 | return -LTTNG_ERR_INVALID; | |
1446 | } | |
1447 | ||
6d805429 | 1448 | lsm.cmd_type = LTTNG_DATA_PENDING; |
806e2684 | 1449 | |
cac3069d DG |
1450 | lttng_ctl_copy_string(lsm.session.name, session_name, |
1451 | sizeof(lsm.session.name)); | |
806e2684 | 1452 | |
cac3069d | 1453 | ret = lttng_ctl_ask_sessiond(&lsm, NULL); |
806e2684 DG |
1454 | |
1455 | /* | |
cac3069d DG |
1456 | * The lttng_ctl_ask_sessiond function negate the return code if it's not |
1457 | * LTTNG_OK so getting -1 means that the reply ret_code was 1 thus meaning | |
1458 | * that the data is available. Yes it is hackish but for now this is the | |
1459 | * only way. | |
806e2684 DG |
1460 | */ |
1461 | if (ret == -1) { | |
1462 | ret = 1; | |
1463 | } | |
1464 | ||
1465 | return ret; | |
1466 | } | |
1467 | ||
27babd3a DG |
1468 | /* |
1469 | * Create a session exclusively used for snapshot. | |
1470 | * | |
1471 | * Returns LTTNG_OK on success or a negative error code. | |
1472 | */ | |
1473 | int lttng_create_session_snapshot(const char *name, const char *snapshot_url) | |
1474 | { | |
1475 | int ret; | |
1476 | ssize_t size; | |
1477 | struct lttcomm_session_msg lsm; | |
1478 | struct lttng_uri *uris = NULL; | |
1479 | ||
1480 | if (name == NULL) { | |
1481 | return -LTTNG_ERR_INVALID; | |
1482 | } | |
1483 | ||
1484 | memset(&lsm, 0, sizeof(lsm)); | |
1485 | ||
1486 | lsm.cmd_type = LTTNG_CREATE_SESSION_SNAPSHOT; | |
1487 | lttng_ctl_copy_string(lsm.session.name, name, sizeof(lsm.session.name)); | |
1488 | ||
1489 | size = uri_parse_str_urls(snapshot_url, NULL, &uris); | |
1490 | if (size < 0) { | |
1491 | return -LTTNG_ERR_INVALID; | |
1492 | } | |
1493 | ||
1494 | lsm.u.uri.size = size; | |
1495 | ||
1496 | ret = lttng_ctl_ask_sessiond_varlen(&lsm, uris, | |
1497 | sizeof(struct lttng_uri) * size, NULL); | |
1498 | ||
1499 | free(uris); | |
1500 | return ret; | |
1501 | } | |
1502 | ||
ecc48a90 JD |
1503 | /* |
1504 | * Create a session exclusively used for live. | |
1505 | * | |
1506 | * Returns LTTNG_OK on success or a negative error code. | |
1507 | */ | |
1508 | int lttng_create_session_live(const char *name, const char *url, | |
1509 | unsigned int timer_interval) | |
1510 | { | |
1511 | int ret; | |
1512 | ssize_t size; | |
1513 | struct lttcomm_session_msg lsm; | |
1514 | struct lttng_uri *uris = NULL; | |
1515 | ||
1516 | if (name == NULL) { | |
1517 | return -LTTNG_ERR_INVALID; | |
1518 | } | |
1519 | ||
1520 | memset(&lsm, 0, sizeof(lsm)); | |
1521 | ||
1522 | lsm.cmd_type = LTTNG_CREATE_SESSION_LIVE; | |
1523 | lttng_ctl_copy_string(lsm.session.name, name, sizeof(lsm.session.name)); | |
1524 | ||
1525 | size = uri_parse_str_urls(url, NULL, &uris); | |
1526 | if (size < 0) { | |
1527 | ret = -LTTNG_ERR_INVALID; | |
1528 | goto end; | |
1529 | } | |
1530 | ||
1531 | /* file:// is not accepted for live session. */ | |
1532 | if (uris[0].dtype == LTTNG_DST_PATH) { | |
1533 | ret = -LTTNG_ERR_INVALID; | |
1534 | goto end; | |
1535 | } | |
1536 | ||
1537 | lsm.u.session_live.nb_uri = size; | |
1538 | lsm.u.session_live.timer_interval = timer_interval; | |
1539 | ||
1540 | ret = lttng_ctl_ask_sessiond_varlen(&lsm, uris, | |
1541 | sizeof(struct lttng_uri) * size, NULL); | |
1542 | ||
1543 | end: | |
1544 | free(uris); | |
1545 | return ret; | |
1546 | } | |
1547 | ||
fac6795d DG |
1548 | /* |
1549 | * lib constructor | |
1550 | */ | |
1551 | static void __attribute__((constructor)) init() | |
1552 | { | |
1553 | /* Set default session group */ | |
bbccc3d2 | 1554 | lttng_set_tracing_group(DEFAULT_TRACING_GROUP); |
fac6795d | 1555 | } |
49cca668 DG |
1556 | |
1557 | /* | |
1558 | * lib destructor | |
1559 | */ | |
1560 | static void __attribute__((destructor)) lttng_ctl_exit() | |
1561 | { | |
1562 | free(tracing_group); | |
1563 | } |