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 | ||
6c1c0768 | 22 | #define _LGPL_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; | |
c7e35b03 | 77 | int lttng_opt_mi; |
97e19046 | 78 | |
99497cd0 MD |
79 | /* |
80 | * Copy string from src to dst and enforce null terminated byte. | |
81 | */ | |
cac3069d DG |
82 | LTTNG_HIDDEN |
83 | void 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 |
99 | LTTNG_HIDDEN |
100 | void 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: |
0e115563 | 109 | case LTTNG_DOMAIN_PYTHON: |
00e2e675 DG |
110 | memcpy(dst, src, sizeof(struct lttng_domain)); |
111 | break; | |
112 | default: | |
113 | memset(dst, 0, sizeof(struct lttng_domain)); | |
00e2e675 | 114 | break; |
cd80958d DG |
115 | } |
116 | } | |
117 | } | |
118 | ||
119 | /* | |
120 | * Send lttcomm_session_msg to the session daemon. | |
fac6795d | 121 | * |
1c8d13c8 TD |
122 | * On success, returns the number of bytes sent (>=0) |
123 | * On error, returns -1 | |
fac6795d | 124 | */ |
cd80958d | 125 | static int send_session_msg(struct lttcomm_session_msg *lsm) |
fac6795d DG |
126 | { |
127 | int ret; | |
128 | ||
129 | if (!connected) { | |
2f70b271 | 130 | ret = -LTTNG_ERR_NO_SESSIOND; |
e065084a | 131 | goto end; |
fac6795d DG |
132 | } |
133 | ||
a4b92340 DG |
134 | DBG("LSM cmd type : %d", lsm->cmd_type); |
135 | ||
be040666 | 136 | ret = lttcomm_send_creds_unix_sock(sessiond_socket, lsm, |
cd80958d | 137 | sizeof(struct lttcomm_session_msg)); |
2f70b271 DG |
138 | if (ret < 0) { |
139 | ret = -LTTNG_ERR_FATAL; | |
140 | } | |
e065084a DG |
141 | |
142 | end: | |
143 | return ret; | |
144 | } | |
145 | ||
53a80697 MD |
146 | /* |
147 | * Send var len data to the session daemon. | |
148 | * | |
149 | * On success, returns the number of bytes sent (>=0) | |
150 | * On error, returns -1 | |
151 | */ | |
152 | static int send_session_varlen(void *data, size_t len) | |
153 | { | |
154 | int ret; | |
155 | ||
156 | if (!connected) { | |
2f70b271 | 157 | ret = -LTTNG_ERR_NO_SESSIOND; |
53a80697 MD |
158 | goto end; |
159 | } | |
a4b92340 | 160 | |
53a80697 MD |
161 | if (!data || !len) { |
162 | ret = 0; | |
163 | goto end; | |
164 | } | |
165 | ||
166 | ret = lttcomm_send_unix_sock(sessiond_socket, data, len); | |
2f70b271 DG |
167 | if (ret < 0) { |
168 | ret = -LTTNG_ERR_FATAL; | |
169 | } | |
53a80697 MD |
170 | |
171 | end: | |
172 | return ret; | |
173 | } | |
174 | ||
e065084a | 175 | /* |
cd80958d | 176 | * Receive data from the sessiond socket. |
e065084a | 177 | * |
1c8d13c8 TD |
178 | * On success, returns the number of bytes received (>=0) |
179 | * On error, returns -1 (recvmsg() error) or -ENOTCONN | |
e065084a | 180 | */ |
ca95a216 | 181 | static int recv_data_sessiond(void *buf, size_t len) |
e065084a DG |
182 | { |
183 | int ret; | |
184 | ||
185 | if (!connected) { | |
2f70b271 | 186 | ret = -LTTNG_ERR_NO_SESSIOND; |
e065084a | 187 | goto end; |
fac6795d DG |
188 | } |
189 | ||
ca95a216 | 190 | ret = lttcomm_recv_unix_sock(sessiond_socket, buf, len); |
2f70b271 DG |
191 | if (ret < 0) { |
192 | ret = -LTTNG_ERR_FATAL; | |
193 | } | |
fac6795d | 194 | |
e065084a | 195 | end: |
fac6795d DG |
196 | return ret; |
197 | } | |
198 | ||
199 | /* | |
9ae110e2 | 200 | * Check if we are in the specified group. |
65beb5ff | 201 | * |
9ae110e2 | 202 | * If yes return 1, else return -1. |
947308c4 | 203 | */ |
6c71277b MD |
204 | LTTNG_HIDDEN |
205 | int lttng_check_tracing_group(void) | |
947308c4 DG |
206 | { |
207 | struct group *grp_tracing; /* no free(). See getgrnam(3) */ | |
208 | gid_t *grp_list; | |
209 | int grp_list_size, grp_id, i; | |
210 | int ret = -1; | |
6c71277b | 211 | const char *grp_name = tracing_group; |
947308c4 DG |
212 | |
213 | /* Get GID of group 'tracing' */ | |
214 | grp_tracing = getgrnam(grp_name); | |
b4d8603b MD |
215 | if (!grp_tracing) { |
216 | /* If grp_tracing is NULL, the group does not exist. */ | |
947308c4 DG |
217 | goto end; |
218 | } | |
219 | ||
220 | /* Get number of supplementary group IDs */ | |
221 | grp_list_size = getgroups(0, NULL); | |
222 | if (grp_list_size < 0) { | |
6f04ed72 | 223 | PERROR("getgroups"); |
947308c4 DG |
224 | goto end; |
225 | } | |
226 | ||
227 | /* Alloc group list of the right size */ | |
3f451dc0 | 228 | grp_list = zmalloc(grp_list_size * sizeof(gid_t)); |
00795392 | 229 | if (!grp_list) { |
6f04ed72 | 230 | PERROR("malloc"); |
00795392 MD |
231 | goto end; |
232 | } | |
947308c4 | 233 | grp_id = getgroups(grp_list_size, grp_list); |
1c8d13c8 | 234 | if (grp_id < 0) { |
6f04ed72 | 235 | PERROR("getgroups"); |
947308c4 DG |
236 | goto free_list; |
237 | } | |
238 | ||
239 | for (i = 0; i < grp_list_size; i++) { | |
240 | if (grp_list[i] == grp_tracing->gr_gid) { | |
2269e89e | 241 | ret = 1; |
947308c4 DG |
242 | break; |
243 | } | |
244 | } | |
245 | ||
246 | free_list: | |
247 | free(grp_list); | |
248 | ||
249 | end: | |
250 | return ret; | |
251 | } | |
252 | ||
253 | /* | |
2269e89e DG |
254 | * Try connect to session daemon with sock_path. |
255 | * | |
256 | * Return 0 on success, else -1 | |
257 | */ | |
258 | static int try_connect_sessiond(const char *sock_path) | |
259 | { | |
260 | int ret; | |
261 | ||
262 | /* If socket exist, we check if the daemon listens for connect. */ | |
263 | ret = access(sock_path, F_OK); | |
264 | if (ret < 0) { | |
265 | /* Not alive */ | |
2f70b271 | 266 | goto error; |
2269e89e DG |
267 | } |
268 | ||
269 | ret = lttcomm_connect_unix_sock(sock_path); | |
270 | if (ret < 0) { | |
9ae110e2 | 271 | /* Not alive. */ |
2f70b271 | 272 | goto error; |
2269e89e DG |
273 | } |
274 | ||
275 | ret = lttcomm_close_unix_sock(ret); | |
276 | if (ret < 0) { | |
6f04ed72 | 277 | PERROR("lttcomm_close_unix_sock"); |
2269e89e DG |
278 | } |
279 | ||
280 | return 0; | |
2f70b271 DG |
281 | |
282 | error: | |
283 | return -1; | |
2269e89e DG |
284 | } |
285 | ||
286 | /* | |
2f70b271 DG |
287 | * Set sessiond socket path by putting it in the global sessiond_sock_path |
288 | * variable. | |
289 | * | |
290 | * Returns 0 on success, negative value on failure (the sessiond socket path | |
291 | * is somehow too long or ENOMEM). | |
947308c4 DG |
292 | */ |
293 | static int set_session_daemon_path(void) | |
294 | { | |
9ae110e2 | 295 | int in_tgroup = 0; /* In tracing group. */ |
2269e89e DG |
296 | uid_t uid; |
297 | ||
298 | uid = getuid(); | |
947308c4 | 299 | |
2269e89e DG |
300 | if (uid != 0) { |
301 | /* Are we in the tracing group ? */ | |
6c71277b | 302 | in_tgroup = lttng_check_tracing_group(); |
2269e89e DG |
303 | } |
304 | ||
08a9c49f | 305 | if ((uid == 0) || in_tgroup) { |
cac3069d DG |
306 | lttng_ctl_copy_string(sessiond_sock_path, |
307 | DEFAULT_GLOBAL_CLIENT_UNIX_SOCK, sizeof(sessiond_sock_path)); | |
08a9c49f | 308 | } |
2269e89e | 309 | |
08a9c49f | 310 | if (uid != 0) { |
c617c0c6 MD |
311 | int ret; |
312 | ||
08a9c49f | 313 | if (in_tgroup) { |
9ae110e2 | 314 | /* Tracing group. */ |
08a9c49f TD |
315 | ret = try_connect_sessiond(sessiond_sock_path); |
316 | if (ret >= 0) { | |
317 | goto end; | |
2269e89e | 318 | } |
08a9c49f | 319 | /* Global session daemon not available... */ |
2269e89e | 320 | } |
08a9c49f TD |
321 | /* ...or not in tracing group (and not root), default */ |
322 | ||
323 | /* | |
9ae110e2 JG |
324 | * With GNU C < 2.1, snprintf returns -1 if the target buffer |
325 | * is too small; | |
326 | * With GNU C >= 2.1, snprintf returns the required size | |
327 | * (excluding closing null) | |
08a9c49f TD |
328 | */ |
329 | ret = snprintf(sessiond_sock_path, sizeof(sessiond_sock_path), | |
feb0f3e5 | 330 | DEFAULT_HOME_CLIENT_UNIX_SOCK, utils_get_home_dir()); |
08a9c49f | 331 | if ((ret < 0) || (ret >= sizeof(sessiond_sock_path))) { |
2f70b271 | 332 | goto error; |
947308c4 | 333 | } |
947308c4 | 334 | } |
08a9c49f | 335 | end: |
947308c4 | 336 | return 0; |
2f70b271 DG |
337 | |
338 | error: | |
339 | return -1; | |
947308c4 DG |
340 | } |
341 | ||
65beb5ff | 342 | /* |
9ae110e2 | 343 | * Connect to the LTTng session daemon. |
65beb5ff | 344 | * |
9ae110e2 | 345 | * On success, return 0. On error, return -1. |
65beb5ff DG |
346 | */ |
347 | static int connect_sessiond(void) | |
348 | { | |
349 | int ret; | |
350 | ||
da3c9ec1 DG |
351 | /* Don't try to connect if already connected. */ |
352 | if (connected) { | |
353 | return 0; | |
354 | } | |
355 | ||
65beb5ff DG |
356 | ret = set_session_daemon_path(); |
357 | if (ret < 0) { | |
2f70b271 | 358 | goto error; |
65beb5ff DG |
359 | } |
360 | ||
9ae110e2 | 361 | /* Connect to the sesssion daemon. */ |
65beb5ff DG |
362 | ret = lttcomm_connect_unix_sock(sessiond_sock_path); |
363 | if (ret < 0) { | |
2f70b271 | 364 | goto error; |
65beb5ff DG |
365 | } |
366 | ||
367 | sessiond_socket = ret; | |
368 | connected = 1; | |
369 | ||
370 | return 0; | |
2f70b271 DG |
371 | |
372 | error: | |
373 | return -1; | |
65beb5ff DG |
374 | } |
375 | ||
376 | /* | |
1c8d13c8 | 377 | * Clean disconnect from the session daemon. |
9ae110e2 | 378 | * |
1c8d13c8 | 379 | * On success, return 0. On error, return -1. |
65beb5ff DG |
380 | */ |
381 | static int disconnect_sessiond(void) | |
382 | { | |
383 | int ret = 0; | |
384 | ||
385 | if (connected) { | |
386 | ret = lttcomm_close_unix_sock(sessiond_socket); | |
387 | sessiond_socket = 0; | |
388 | connected = 0; | |
389 | } | |
390 | ||
391 | return ret; | |
392 | } | |
393 | ||
35a6fdb7 | 394 | /* |
cd80958d | 395 | * Ask the session daemon a specific command and put the data into buf. |
53a80697 | 396 | * Takes extra var. len. data as input to send to the session daemon. |
65beb5ff | 397 | * |
af87c45a | 398 | * Return size of data (only payload, not header) or a negative error code. |
65beb5ff | 399 | */ |
cac3069d DG |
400 | LTTNG_HIDDEN |
401 | int lttng_ctl_ask_sessiond_varlen(struct lttcomm_session_msg *lsm, | |
a4b92340 | 402 | void *vardata, size_t varlen, void **buf) |
65beb5ff DG |
403 | { |
404 | int ret; | |
405 | size_t size; | |
406 | void *data = NULL; | |
cd80958d | 407 | struct lttcomm_lttng_msg llm; |
65beb5ff DG |
408 | |
409 | ret = connect_sessiond(); | |
410 | if (ret < 0) { | |
2f70b271 | 411 | ret = -LTTNG_ERR_NO_SESSIOND; |
65beb5ff DG |
412 | goto end; |
413 | } | |
414 | ||
65beb5ff | 415 | /* Send command to session daemon */ |
cd80958d | 416 | ret = send_session_msg(lsm); |
65beb5ff | 417 | if (ret < 0) { |
2f70b271 | 418 | /* Ret value is a valid lttng error code. */ |
65beb5ff DG |
419 | goto end; |
420 | } | |
53a80697 MD |
421 | /* Send var len data */ |
422 | ret = send_session_varlen(vardata, varlen); | |
423 | if (ret < 0) { | |
2f70b271 | 424 | /* Ret value is a valid lttng error code. */ |
53a80697 MD |
425 | goto end; |
426 | } | |
65beb5ff DG |
427 | |
428 | /* Get header from data transmission */ | |
429 | ret = recv_data_sessiond(&llm, sizeof(llm)); | |
430 | if (ret < 0) { | |
2f70b271 | 431 | /* Ret value is a valid lttng error code. */ |
65beb5ff DG |
432 | goto end; |
433 | } | |
434 | ||
435 | /* Check error code if OK */ | |
f73fabfd | 436 | if (llm.ret_code != LTTNG_OK) { |
65beb5ff DG |
437 | ret = -llm.ret_code; |
438 | goto end; | |
439 | } | |
440 | ||
441 | size = llm.data_size; | |
442 | if (size == 0) { | |
874d3f84 | 443 | /* If client free with size 0 */ |
a45d5536 DG |
444 | if (buf != NULL) { |
445 | *buf = NULL; | |
446 | } | |
7d29a247 | 447 | ret = 0; |
65beb5ff DG |
448 | goto end; |
449 | } | |
450 | ||
3f451dc0 MD |
451 | data = zmalloc(size); |
452 | if (!data) { | |
453 | ret = -ENOMEM; | |
454 | goto end; | |
455 | } | |
65beb5ff DG |
456 | |
457 | /* Get payload data */ | |
458 | ret = recv_data_sessiond(data, size); | |
459 | if (ret < 0) { | |
460 | free(data); | |
461 | goto end; | |
462 | } | |
463 | ||
83009e5e DG |
464 | /* |
465 | * Extra protection not to dereference a NULL pointer. If buf is NULL at | |
466 | * this point, an error is returned and data is freed. | |
467 | */ | |
468 | if (buf == NULL) { | |
2f70b271 | 469 | ret = -LTTNG_ERR_INVALID; |
83009e5e DG |
470 | free(data); |
471 | goto end; | |
472 | } | |
473 | ||
65beb5ff DG |
474 | *buf = data; |
475 | ret = size; | |
476 | ||
477 | end: | |
478 | disconnect_sessiond(); | |
479 | return ret; | |
480 | } | |
481 | ||
9f19cc17 | 482 | /* |
cd80958d | 483 | * Create lttng handle and return pointer. |
9ae110e2 | 484 | * |
1c8d13c8 | 485 | * The returned pointer will be NULL in case of malloc() error. |
9f19cc17 | 486 | */ |
cd80958d DG |
487 | struct lttng_handle *lttng_create_handle(const char *session_name, |
488 | struct lttng_domain *domain) | |
9f19cc17 | 489 | { |
2f70b271 DG |
490 | struct lttng_handle *handle = NULL; |
491 | ||
492 | if (domain == NULL) { | |
493 | goto end; | |
494 | } | |
cd80958d | 495 | |
3f451dc0 | 496 | handle = zmalloc(sizeof(struct lttng_handle)); |
cd80958d | 497 | if (handle == NULL) { |
2f70b271 | 498 | PERROR("malloc handle"); |
cd80958d DG |
499 | goto end; |
500 | } | |
501 | ||
502 | /* Copy session name */ | |
cac3069d | 503 | lttng_ctl_copy_string(handle->session_name, session_name, |
cd80958d DG |
504 | sizeof(handle->session_name)); |
505 | ||
506 | /* Copy lttng domain */ | |
cac3069d | 507 | lttng_ctl_copy_lttng_domain(&handle->domain, domain); |
cd80958d DG |
508 | |
509 | end: | |
510 | return handle; | |
511 | } | |
512 | ||
513 | /* | |
514 | * Destroy handle by free(3) the pointer. | |
515 | */ | |
516 | void lttng_destroy_handle(struct lttng_handle *handle) | |
517 | { | |
0e428499 | 518 | free(handle); |
eb354453 DG |
519 | } |
520 | ||
d9800920 DG |
521 | /* |
522 | * Register an outside consumer. | |
9ae110e2 | 523 | * |
1c8d13c8 | 524 | * Returns size of returned session payload data or a negative error code. |
d9800920 DG |
525 | */ |
526 | int lttng_register_consumer(struct lttng_handle *handle, | |
527 | const char *socket_path) | |
528 | { | |
529 | struct lttcomm_session_msg lsm; | |
530 | ||
2f70b271 DG |
531 | if (handle == NULL || socket_path == NULL) { |
532 | return -LTTNG_ERR_INVALID; | |
533 | } | |
534 | ||
53efb85a | 535 | memset(&lsm, 0, sizeof(lsm)); |
d9800920 | 536 | lsm.cmd_type = LTTNG_REGISTER_CONSUMER; |
cac3069d | 537 | lttng_ctl_copy_string(lsm.session.name, handle->session_name, |
d9800920 | 538 | sizeof(lsm.session.name)); |
cac3069d | 539 | lttng_ctl_copy_lttng_domain(&lsm.domain, &handle->domain); |
d9800920 | 540 | |
9ae110e2 JG |
541 | lttng_ctl_copy_string(lsm.u.reg.path, socket_path, |
542 | sizeof(lsm.u.reg.path)); | |
d9800920 | 543 | |
cac3069d | 544 | return lttng_ctl_ask_sessiond(&lsm, NULL); |
d9800920 DG |
545 | } |
546 | ||
1df4dedd | 547 | /* |
9ae110e2 JG |
548 | * Start tracing for all traces of the session. |
549 | * | |
550 | * Returns size of returned session payload data or a negative error code. | |
1df4dedd | 551 | */ |
6a4f824d | 552 | int lttng_start_tracing(const char *session_name) |
f3ed775e | 553 | { |
cd80958d DG |
554 | struct lttcomm_session_msg lsm; |
555 | ||
6a4f824d | 556 | if (session_name == NULL) { |
2f70b271 | 557 | return -LTTNG_ERR_INVALID; |
cd80958d DG |
558 | } |
559 | ||
53efb85a | 560 | memset(&lsm, 0, sizeof(lsm)); |
cd80958d | 561 | lsm.cmd_type = LTTNG_START_TRACE; |
6a4f824d | 562 | |
cac3069d DG |
563 | lttng_ctl_copy_string(lsm.session.name, session_name, |
564 | sizeof(lsm.session.name)); | |
cd80958d | 565 | |
cac3069d | 566 | return lttng_ctl_ask_sessiond(&lsm, NULL); |
f3ed775e | 567 | } |
1df4dedd DG |
568 | |
569 | /* | |
38ee087f | 570 | * Stop tracing for all traces of the session. |
f3ed775e | 571 | */ |
38ee087f | 572 | static int _lttng_stop_tracing(const char *session_name, int wait) |
f3ed775e | 573 | { |
38ee087f | 574 | int ret, data_ret; |
cd80958d DG |
575 | struct lttcomm_session_msg lsm; |
576 | ||
6a4f824d | 577 | if (session_name == NULL) { |
2f70b271 | 578 | return -LTTNG_ERR_INVALID; |
6a4f824d DG |
579 | } |
580 | ||
53efb85a | 581 | memset(&lsm, 0, sizeof(lsm)); |
cd80958d | 582 | lsm.cmd_type = LTTNG_STOP_TRACE; |
6a4f824d | 583 | |
cac3069d DG |
584 | lttng_ctl_copy_string(lsm.session.name, session_name, |
585 | sizeof(lsm.session.name)); | |
cd80958d | 586 | |
cac3069d | 587 | ret = lttng_ctl_ask_sessiond(&lsm, NULL); |
38ee087f DG |
588 | if (ret < 0 && ret != -LTTNG_ERR_TRACE_ALREADY_STOPPED) { |
589 | goto error; | |
590 | } | |
591 | ||
592 | if (!wait) { | |
593 | goto end; | |
594 | } | |
595 | ||
38ee087f DG |
596 | /* Check for data availability */ |
597 | do { | |
6d805429 | 598 | data_ret = lttng_data_pending(session_name); |
38ee087f DG |
599 | if (data_ret < 0) { |
600 | /* Return the data available call error. */ | |
601 | ret = data_ret; | |
602 | goto error; | |
603 | } | |
604 | ||
605 | /* | |
9ae110e2 JG |
606 | * Data sleep time before retrying (in usec). Don't sleep if the |
607 | * call returned value indicates availability. | |
38ee087f | 608 | */ |
6d805429 | 609 | if (data_ret) { |
38ee087f | 610 | usleep(DEFAULT_DATA_AVAILABILITY_WAIT_TIME); |
38ee087f | 611 | } |
6d805429 | 612 | } while (data_ret != 0); |
38ee087f | 613 | |
38ee087f DG |
614 | end: |
615 | error: | |
616 | return ret; | |
617 | } | |
618 | ||
619 | /* | |
620 | * Stop tracing and wait for data availability. | |
621 | */ | |
622 | int lttng_stop_tracing(const char *session_name) | |
623 | { | |
624 | return _lttng_stop_tracing(session_name, 1); | |
625 | } | |
626 | ||
627 | /* | |
628 | * Stop tracing but _don't_ wait for data availability. | |
629 | */ | |
630 | int lttng_stop_tracing_no_wait(const char *session_name) | |
631 | { | |
632 | return _lttng_stop_tracing(session_name, 0); | |
f3ed775e DG |
633 | } |
634 | ||
635 | /* | |
601d5acf DG |
636 | * Add context to a channel. |
637 | * | |
638 | * If the given channel is NULL, add the contexts to all channels. | |
639 | * The event_name param is ignored. | |
af87c45a DG |
640 | * |
641 | * Returns the size of the returned payload data or a negative error code. | |
1df4dedd | 642 | */ |
cd80958d | 643 | int lttng_add_context(struct lttng_handle *handle, |
38057ed1 DG |
644 | struct lttng_event_context *ctx, const char *event_name, |
645 | const char *channel_name) | |
d65106b1 | 646 | { |
cd80958d DG |
647 | struct lttcomm_session_msg lsm; |
648 | ||
9ae110e2 | 649 | /* Safety check. Both are mandatory. */ |
9d697d3d | 650 | if (handle == NULL || ctx == NULL) { |
2f70b271 | 651 | return -LTTNG_ERR_INVALID; |
cd80958d DG |
652 | } |
653 | ||
441c16a7 MD |
654 | memset(&lsm, 0, sizeof(lsm)); |
655 | ||
cd80958d DG |
656 | lsm.cmd_type = LTTNG_ADD_CONTEXT; |
657 | ||
85076754 MD |
658 | /* If no channel name, send empty string. */ |
659 | if (channel_name == NULL) { | |
660 | lttng_ctl_copy_string(lsm.u.context.channel_name, "", | |
661 | sizeof(lsm.u.context.channel_name)); | |
662 | } else { | |
663 | lttng_ctl_copy_string(lsm.u.context.channel_name, channel_name, | |
664 | sizeof(lsm.u.context.channel_name)); | |
665 | } | |
cd80958d | 666 | |
cac3069d | 667 | lttng_ctl_copy_lttng_domain(&lsm.domain, &handle->domain); |
d65106b1 | 668 | |
9d697d3d | 669 | memcpy(&lsm.u.context.ctx, ctx, sizeof(struct lttng_event_context)); |
d65106b1 | 670 | |
cac3069d | 671 | lttng_ctl_copy_string(lsm.session.name, handle->session_name, |
cd80958d DG |
672 | sizeof(lsm.session.name)); |
673 | ||
cac3069d | 674 | return lttng_ctl_ask_sessiond(&lsm, NULL); |
d65106b1 DG |
675 | } |
676 | ||
f3ed775e | 677 | /* |
9ae110e2 JG |
678 | * Enable event(s) for a channel. |
679 | * | |
680 | * If no event name is specified, all events are enabled. | |
681 | * If no channel name is specified, the default 'channel0' is used. | |
682 | * | |
683 | * Returns size of returned session payload data or a negative error code. | |
f3ed775e | 684 | */ |
cd80958d | 685 | int lttng_enable_event(struct lttng_handle *handle, |
38057ed1 | 686 | struct lttng_event *ev, const char *channel_name) |
1df4dedd | 687 | { |
f8a96544 JI |
688 | return lttng_enable_event_with_exclusions(handle, ev, channel_name, |
689 | NULL, 0, NULL); | |
1df4dedd DG |
690 | } |
691 | ||
53a80697 | 692 | /* |
025faf73 | 693 | * Create or enable an event with a filter expression. |
178191b3 | 694 | * |
53a80697 MD |
695 | * Return negative error value on error. |
696 | * Return size of returned session payload data if OK. | |
697 | */ | |
025faf73 | 698 | int lttng_enable_event_with_filter(struct lttng_handle *handle, |
178191b3 | 699 | struct lttng_event *event, const char *channel_name, |
53a80697 MD |
700 | const char *filter_expression) |
701 | { | |
f8a96544 JI |
702 | return lttng_enable_event_with_exclusions(handle, event, channel_name, |
703 | filter_expression, 0, NULL); | |
53a80697 MD |
704 | } |
705 | ||
347c5ab5 | 706 | /* |
0e115563 | 707 | * Depending on the event, return a newly allocated agent filter expression or |
347c5ab5 DG |
708 | * NULL if not applicable. |
709 | * | |
710 | * An event with NO loglevel and the name is * will return NULL. | |
711 | */ | |
0e115563 | 712 | static char *set_agent_filter(const char *filter, struct lttng_event *ev) |
347c5ab5 DG |
713 | { |
714 | int err; | |
0e115563 | 715 | char *agent_filter = NULL; |
347c5ab5 DG |
716 | |
717 | assert(ev); | |
718 | ||
719 | /* Don't add filter for the '*' event. */ | |
720 | if (ev->name[0] != '*') { | |
721 | if (filter) { | |
0e115563 | 722 | err = asprintf(&agent_filter, "(%s) && (logger_name == \"%s\")", filter, |
347c5ab5 DG |
723 | ev->name); |
724 | } else { | |
0e115563 | 725 | err = asprintf(&agent_filter, "logger_name == \"%s\"", ev->name); |
347c5ab5 DG |
726 | } |
727 | if (err < 0) { | |
728 | PERROR("asprintf"); | |
6a556f7b | 729 | goto error; |
347c5ab5 DG |
730 | } |
731 | } | |
732 | ||
733 | /* Add loglevel filtering if any for the JUL domain. */ | |
734 | if (ev->loglevel_type != LTTNG_EVENT_LOGLEVEL_ALL) { | |
735 | char *op; | |
736 | ||
737 | if (ev->loglevel_type == LTTNG_EVENT_LOGLEVEL_RANGE) { | |
738 | op = ">="; | |
739 | } else { | |
740 | op = "=="; | |
741 | } | |
742 | ||
0e115563 | 743 | if (filter || agent_filter) { |
6a556f7b JG |
744 | char *new_filter; |
745 | ||
fb0edb23 | 746 | err = asprintf(&new_filter, "(%s) && (int_loglevel %s %d)", |
0e115563 | 747 | agent_filter ? agent_filter : filter, op, |
347c5ab5 | 748 | ev->loglevel); |
0e115563 DG |
749 | if (agent_filter) { |
750 | free(agent_filter); | |
6a556f7b | 751 | } |
0e115563 | 752 | agent_filter = new_filter; |
347c5ab5 | 753 | } else { |
0e115563 | 754 | err = asprintf(&agent_filter, "int_loglevel %s %d", op, |
347c5ab5 DG |
755 | ev->loglevel); |
756 | } | |
757 | if (err < 0) { | |
758 | PERROR("asprintf"); | |
6a556f7b | 759 | goto error; |
347c5ab5 DG |
760 | } |
761 | } | |
762 | ||
0e115563 | 763 | return agent_filter; |
6a556f7b | 764 | error: |
0e115563 | 765 | free(agent_filter); |
6a556f7b | 766 | return NULL; |
347c5ab5 DG |
767 | } |
768 | ||
137b9942 | 769 | /* |
ec166985 | 770 | * Generate the filter bytecode from a given filter expression string. Put the |
137b9942 DG |
771 | * newly allocated parser context in ctxp and populate the lsm object with the |
772 | * expression len. | |
773 | * | |
774 | * Return 0 on success else a LTTNG_ERR_* code and ctxp is untouched. | |
775 | */ | |
776 | static int generate_filter(char *filter_expression, | |
777 | struct lttcomm_session_msg *lsm, struct filter_parser_ctx **ctxp) | |
778 | { | |
779 | int ret; | |
780 | struct filter_parser_ctx *ctx = NULL; | |
781 | FILE *fmem = NULL; | |
782 | ||
783 | assert(filter_expression); | |
784 | assert(lsm); | |
785 | assert(ctxp); | |
786 | ||
787 | /* | |
788 | * Casting const to non-const, as the underlying function will use it in | |
789 | * read-only mode. | |
790 | */ | |
791 | fmem = lttng_fmemopen((void *) filter_expression, | |
792 | strlen(filter_expression), "r"); | |
793 | if (!fmem) { | |
794 | fprintf(stderr, "Error opening memory as stream\n"); | |
795 | ret = -LTTNG_ERR_FILTER_NOMEM; | |
796 | goto error; | |
797 | } | |
798 | ctx = filter_parser_ctx_alloc(fmem); | |
799 | if (!ctx) { | |
800 | fprintf(stderr, "Error allocating parser\n"); | |
801 | ret = -LTTNG_ERR_FILTER_NOMEM; | |
802 | goto filter_alloc_error; | |
803 | } | |
804 | ret = filter_parser_ctx_append_ast(ctx); | |
805 | if (ret) { | |
806 | fprintf(stderr, "Parse error\n"); | |
807 | ret = -LTTNG_ERR_FILTER_INVAL; | |
808 | goto parse_error; | |
809 | } | |
810 | ret = filter_visitor_set_parent(ctx); | |
811 | if (ret) { | |
812 | fprintf(stderr, "Set parent error\n"); | |
813 | ret = -LTTNG_ERR_FILTER_INVAL; | |
814 | goto parse_error; | |
815 | } | |
816 | if (print_xml) { | |
817 | ret = filter_visitor_print_xml(ctx, stdout, 0); | |
818 | if (ret) { | |
819 | fflush(stdout); | |
820 | fprintf(stderr, "XML print error\n"); | |
821 | ret = -LTTNG_ERR_FILTER_INVAL; | |
822 | goto parse_error; | |
823 | } | |
824 | } | |
825 | ||
826 | dbg_printf("Generating IR... "); | |
827 | fflush(stdout); | |
828 | ret = filter_visitor_ir_generate(ctx); | |
829 | if (ret) { | |
830 | fprintf(stderr, "Generate IR error\n"); | |
831 | ret = -LTTNG_ERR_FILTER_INVAL; | |
832 | goto parse_error; | |
833 | } | |
834 | dbg_printf("done\n"); | |
835 | ||
836 | dbg_printf("Validating IR... "); | |
837 | fflush(stdout); | |
838 | ret = filter_visitor_ir_check_binary_op_nesting(ctx); | |
839 | if (ret) { | |
840 | ret = -LTTNG_ERR_FILTER_INVAL; | |
841 | goto parse_error; | |
842 | } | |
9ae110e2 | 843 | /* Validate strings used as literals in the expression. */ |
dcd5daf2 JG |
844 | ret = filter_visitor_ir_validate_string(ctx); |
845 | if (ret) { | |
846 | ret = -LTTNG_ERR_FILTER_INVAL; | |
847 | goto parse_error; | |
848 | } | |
137b9942 DG |
849 | dbg_printf("done\n"); |
850 | ||
851 | dbg_printf("Generating bytecode... "); | |
852 | fflush(stdout); | |
853 | ret = filter_visitor_bytecode_generate(ctx); | |
854 | if (ret) { | |
855 | fprintf(stderr, "Generate bytecode error\n"); | |
856 | ret = -LTTNG_ERR_FILTER_INVAL; | |
857 | goto parse_error; | |
858 | } | |
859 | dbg_printf("done\n"); | |
860 | dbg_printf("Size of bytecode generated: %u bytes.\n", | |
861 | bytecode_get_len(&ctx->bytecode->b)); | |
862 | ||
863 | lsm->u.enable.bytecode_len = sizeof(ctx->bytecode->b) | |
864 | + bytecode_get_len(&ctx->bytecode->b); | |
865 | lsm->u.enable.expression_len = strlen(filter_expression) + 1; | |
866 | ||
867 | /* No need to keep the memory stream. */ | |
868 | if (fclose(fmem) != 0) { | |
6f04ed72 | 869 | PERROR("fclose"); |
137b9942 DG |
870 | } |
871 | ||
872 | *ctxp = ctx; | |
873 | return 0; | |
874 | ||
875 | parse_error: | |
137b9942 DG |
876 | filter_ir_free(ctx); |
877 | filter_parser_ctx_free(ctx); | |
878 | filter_alloc_error: | |
879 | if (fclose(fmem) != 0) { | |
6f04ed72 | 880 | PERROR("fclose"); |
137b9942 DG |
881 | } |
882 | error: | |
883 | return ret; | |
884 | } | |
885 | ||
93deb080 JI |
886 | /* |
887 | * Enable event(s) for a channel, possibly with exclusions and a filter. | |
888 | * If no event name is specified, all events are enabled. | |
889 | * If no channel name is specified, the default name is used. | |
890 | * If filter expression is not NULL, the filter is set for the event. | |
891 | * If exclusion count is not zero, the exclusions are set for the event. | |
892 | * Returns size of returned session payload data or a negative error code. | |
893 | */ | |
894 | int lttng_enable_event_with_exclusions(struct lttng_handle *handle, | |
895 | struct lttng_event *ev, const char *channel_name, | |
e9efbcd3 | 896 | const char *original_filter_expression, |
93deb080 JI |
897 | int exclusion_count, char **exclusion_list) |
898 | { | |
899 | struct lttcomm_session_msg lsm; | |
64226865 | 900 | char *varlen_data; |
93deb080 | 901 | int ret = 0; |
137b9942 | 902 | unsigned int free_filter_expression = 0; |
93deb080 | 903 | struct filter_parser_ctx *ctx = NULL; |
e9efbcd3 JG |
904 | /* |
905 | * Cast as non-const since we may replace the filter expression | |
906 | * by a dynamically allocated string. Otherwise, the original | |
907 | * string is not modified. | |
908 | */ | |
909 | char *filter_expression = (char *) original_filter_expression; | |
93deb080 JI |
910 | |
911 | if (handle == NULL || ev == NULL) { | |
137b9942 DG |
912 | ret = -LTTNG_ERR_INVALID; |
913 | goto error; | |
93deb080 JI |
914 | } |
915 | ||
9ae110e2 JG |
916 | /* |
917 | * Empty filter string will always be rejected by the parser | |
93deb080 JI |
918 | * anyway, so treat this corner-case early to eliminate |
919 | * lttng_fmemopen error for 0-byte allocation. | |
920 | */ | |
921 | if (filter_expression && filter_expression[0] == '\0') { | |
137b9942 DG |
922 | ret = -LTTNG_ERR_INVALID; |
923 | goto error; | |
93deb080 JI |
924 | } |
925 | ||
926 | memset(&lsm, 0, sizeof(lsm)); | |
927 | ||
928 | /* If no channel name, send empty string. */ | |
929 | if (channel_name == NULL) { | |
930 | lttng_ctl_copy_string(lsm.u.enable.channel_name, "", | |
931 | sizeof(lsm.u.enable.channel_name)); | |
932 | } else { | |
933 | lttng_ctl_copy_string(lsm.u.enable.channel_name, channel_name, | |
934 | sizeof(lsm.u.enable.channel_name)); | |
935 | } | |
936 | ||
18a720cd MD |
937 | lsm.cmd_type = LTTNG_ENABLE_EVENT; |
938 | if (ev->name[0] == '\0') { | |
939 | /* Enable all events */ | |
940 | lttng_ctl_copy_string(ev->name, "*", sizeof(ev->name)); | |
6565421f | 941 | } |
93deb080 | 942 | |
6565421f | 943 | lttng_ctl_copy_lttng_domain(&lsm.domain, &handle->domain); |
6e911cad | 944 | /* FIXME: copying non-packed struct to packed struct. */ |
93deb080 JI |
945 | memcpy(&lsm.u.enable.event, ev, sizeof(lsm.u.enable.event)); |
946 | ||
947 | lttng_ctl_copy_string(lsm.session.name, handle->session_name, | |
948 | sizeof(lsm.session.name)); | |
949 | lsm.u.enable.exclusion_count = exclusion_count; | |
950 | lsm.u.enable.bytecode_len = 0; | |
951 | ||
9b21e6d5 DG |
952 | /* |
953 | * For the JUL domain, a filter is enforced except for the enable all | |
954 | * event. This is done to avoid having the event in all sessions thus | |
955 | * filtering by logger name. | |
956 | */ | |
957 | if (exclusion_count == 0 && filter_expression == NULL && | |
5cdb6027 | 958 | (handle->domain.type != LTTNG_DOMAIN_JUL && |
0e115563 DG |
959 | handle->domain.type != LTTNG_DOMAIN_LOG4J && |
960 | handle->domain.type != LTTNG_DOMAIN_PYTHON)) { | |
3e1c9ff7 | 961 | goto ask_sessiond; |
93deb080 JI |
962 | } |
963 | ||
964 | /* | |
965 | * We have either a filter or some exclusions, so we need to set up | |
9ae110e2 | 966 | * a variable-length memory block from where to send the data. |
93deb080 JI |
967 | */ |
968 | ||
9ae110e2 | 969 | /* Parse filter expression. */ |
5cdb6027 | 970 | if (filter_expression != NULL || handle->domain.type == LTTNG_DOMAIN_JUL |
0e115563 DG |
971 | || handle->domain.type == LTTNG_DOMAIN_LOG4J |
972 | || handle->domain.type == LTTNG_DOMAIN_PYTHON) { | |
5cdb6027 | 973 | if (handle->domain.type == LTTNG_DOMAIN_JUL || |
0e115563 DG |
974 | handle->domain.type == LTTNG_DOMAIN_LOG4J || |
975 | handle->domain.type == LTTNG_DOMAIN_PYTHON) { | |
976 | char *agent_filter; | |
64226865 | 977 | |
347c5ab5 | 978 | /* Setup JUL filter if needed. */ |
0e115563 DG |
979 | agent_filter = set_agent_filter(filter_expression, ev); |
980 | if (!agent_filter) { | |
137b9942 | 981 | if (!filter_expression) { |
9ae110e2 JG |
982 | /* |
983 | * No JUL and no filter, just skip | |
984 | * everything below. | |
985 | */ | |
137b9942 DG |
986 | goto ask_sessiond; |
987 | } | |
64226865 DG |
988 | } else { |
989 | /* | |
9ae110e2 JG |
990 | * With an agent filter, the original filter has |
991 | * been added to it thus replace the filter | |
992 | * expression. | |
64226865 | 993 | */ |
0e115563 | 994 | filter_expression = agent_filter; |
e9efbcd3 | 995 | free_filter_expression = 1; |
9b21e6d5 | 996 | } |
9b21e6d5 | 997 | } |
93deb080 | 998 | |
137b9942 | 999 | ret = generate_filter(filter_expression, &lsm, &ctx); |
93deb080 | 1000 | if (ret) { |
137b9942 | 1001 | goto filter_error; |
93deb080 | 1002 | } |
6b453b5e JG |
1003 | } |
1004 | ||
1005 | varlen_data = zmalloc(lsm.u.enable.bytecode_len | |
137b9942 DG |
1006 | + lsm.u.enable.expression_len |
1007 | + LTTNG_SYMBOL_NAME_LEN * exclusion_count); | |
6b453b5e JG |
1008 | if (!varlen_data) { |
1009 | ret = -LTTNG_ERR_EXCLUSION_NOMEM; | |
7ca1dc6f | 1010 | goto mem_error; |
6b453b5e | 1011 | } |
137b9942 | 1012 | |
9ae110e2 | 1013 | /* Put exclusion names first in the data. */ |
6b453b5e JG |
1014 | while (exclusion_count--) { |
1015 | strncpy(varlen_data + LTTNG_SYMBOL_NAME_LEN * exclusion_count, | |
0c82ac62 PP |
1016 | *(exclusion_list + exclusion_count), |
1017 | LTTNG_SYMBOL_NAME_LEN - 1); | |
6b453b5e | 1018 | } |
9ae110e2 | 1019 | /* Add filter expression next. */ |
6b453b5e JG |
1020 | if (lsm.u.enable.expression_len != 0) { |
1021 | memcpy(varlen_data | |
1022 | + LTTNG_SYMBOL_NAME_LEN * lsm.u.enable.exclusion_count, | |
1023 | filter_expression, | |
1024 | lsm.u.enable.expression_len); | |
1025 | } | |
9ae110e2 | 1026 | /* Add filter bytecode next. */ |
137b9942 | 1027 | if (ctx && lsm.u.enable.bytecode_len != 0) { |
6b453b5e JG |
1028 | memcpy(varlen_data |
1029 | + LTTNG_SYMBOL_NAME_LEN * lsm.u.enable.exclusion_count | |
1030 | + lsm.u.enable.expression_len, | |
1031 | &ctx->bytecode->b, | |
1032 | lsm.u.enable.bytecode_len); | |
93deb080 JI |
1033 | } |
1034 | ||
1035 | ret = lttng_ctl_ask_sessiond_varlen(&lsm, varlen_data, | |
67676bd8 | 1036 | (LTTNG_SYMBOL_NAME_LEN * lsm.u.enable.exclusion_count) + |
9ae110e2 JG |
1037 | lsm.u.enable.bytecode_len + lsm.u.enable.expression_len, |
1038 | NULL); | |
6b453b5e | 1039 | free(varlen_data); |
93deb080 | 1040 | |
7ca1dc6f DG |
1041 | mem_error: |
1042 | if (filter_expression && ctx) { | |
93deb080 JI |
1043 | filter_bytecode_free(ctx); |
1044 | filter_ir_free(ctx); | |
1045 | filter_parser_ctx_free(ctx); | |
7ca1dc6f DG |
1046 | } |
1047 | filter_error: | |
1048 | if (free_filter_expression) { | |
1049 | /* | |
9ae110e2 JG |
1050 | * The filter expression has been replaced and must be freed as |
1051 | * it is not the original filter expression received as a | |
1052 | * parameter. | |
7ca1dc6f DG |
1053 | */ |
1054 | free(filter_expression); | |
93deb080 | 1055 | } |
137b9942 DG |
1056 | error: |
1057 | /* | |
9ae110e2 JG |
1058 | * Return directly to the caller and don't ask the sessiond since |
1059 | * something went wrong in the parsing of data above. | |
137b9942 | 1060 | */ |
93deb080 | 1061 | return ret; |
3e1c9ff7 DG |
1062 | |
1063 | ask_sessiond: | |
1064 | ret = lttng_ctl_ask_sessiond(&lsm, NULL); | |
1065 | return ret; | |
93deb080 JI |
1066 | } |
1067 | ||
6e911cad MD |
1068 | int lttng_disable_event_ext(struct lttng_handle *handle, |
1069 | struct lttng_event *ev, const char *channel_name, | |
1070 | const char *original_filter_expression) | |
1df4dedd | 1071 | { |
cd80958d | 1072 | struct lttcomm_session_msg lsm; |
6e911cad MD |
1073 | char *varlen_data; |
1074 | int ret = 0; | |
1075 | unsigned int free_filter_expression = 0; | |
1076 | struct filter_parser_ctx *ctx = NULL; | |
1077 | /* | |
1078 | * Cast as non-const since we may replace the filter expression | |
1079 | * by a dynamically allocated string. Otherwise, the original | |
1080 | * string is not modified. | |
1081 | */ | |
1082 | char *filter_expression = (char *) original_filter_expression; | |
1df4dedd | 1083 | |
6e911cad MD |
1084 | if (handle == NULL || ev == NULL) { |
1085 | ret = -LTTNG_ERR_INVALID; | |
1086 | goto error; | |
1087 | } | |
1088 | ||
9ae110e2 JG |
1089 | /* |
1090 | * Empty filter string will always be rejected by the parser | |
6e911cad MD |
1091 | * anyway, so treat this corner-case early to eliminate |
1092 | * lttng_fmemopen error for 0-byte allocation. | |
1093 | */ | |
1094 | if (filter_expression && filter_expression[0] == '\0') { | |
1095 | ret = -LTTNG_ERR_INVALID; | |
1096 | goto error; | |
cd80958d DG |
1097 | } |
1098 | ||
441c16a7 MD |
1099 | memset(&lsm, 0, sizeof(lsm)); |
1100 | ||
85076754 MD |
1101 | /* If no channel name, send empty string. */ |
1102 | if (channel_name == NULL) { | |
1103 | lttng_ctl_copy_string(lsm.u.disable.channel_name, "", | |
cd80958d | 1104 | sizeof(lsm.u.disable.channel_name)); |
f3ed775e | 1105 | } else { |
85076754 | 1106 | lttng_ctl_copy_string(lsm.u.disable.channel_name, channel_name, |
cd80958d | 1107 | sizeof(lsm.u.disable.channel_name)); |
eb354453 DG |
1108 | } |
1109 | ||
18a720cd | 1110 | lsm.cmd_type = LTTNG_DISABLE_EVENT; |
f3ed775e | 1111 | |
6e911cad MD |
1112 | lttng_ctl_copy_lttng_domain(&lsm.domain, &handle->domain); |
1113 | /* FIXME: copying non-packed struct to packed struct. */ | |
1114 | memcpy(&lsm.u.disable.event, ev, sizeof(lsm.u.disable.event)); | |
1115 | ||
cac3069d | 1116 | lttng_ctl_copy_string(lsm.session.name, handle->session_name, |
cd80958d | 1117 | sizeof(lsm.session.name)); |
6e911cad | 1118 | lsm.u.disable.bytecode_len = 0; |
cd80958d | 1119 | |
6e911cad MD |
1120 | /* |
1121 | * For the JUL domain, a filter is enforced except for the | |
1122 | * disable all event. This is done to avoid having the event in | |
1123 | * all sessions thus filtering by logger name. | |
1124 | */ | |
1125 | if (filter_expression == NULL && | |
1126 | (handle->domain.type != LTTNG_DOMAIN_JUL && | |
0e115563 DG |
1127 | handle->domain.type != LTTNG_DOMAIN_LOG4J && |
1128 | handle->domain.type != LTTNG_DOMAIN_PYTHON)) { | |
6e911cad MD |
1129 | goto ask_sessiond; |
1130 | } | |
1131 | ||
1132 | /* | |
1133 | * We have a filter, so we need to set up a variable-length | |
1134 | * memory block from where to send the data. | |
1135 | */ | |
1136 | ||
1137 | /* Parse filter expression */ | |
1138 | if (filter_expression != NULL || handle->domain.type == LTTNG_DOMAIN_JUL | |
0e115563 DG |
1139 | || handle->domain.type == LTTNG_DOMAIN_LOG4J |
1140 | || handle->domain.type == LTTNG_DOMAIN_PYTHON) { | |
6e911cad | 1141 | if (handle->domain.type == LTTNG_DOMAIN_JUL || |
0e115563 DG |
1142 | handle->domain.type == LTTNG_DOMAIN_LOG4J || |
1143 | handle->domain.type == LTTNG_DOMAIN_PYTHON) { | |
1144 | char *agent_filter; | |
6e911cad MD |
1145 | |
1146 | /* Setup JUL filter if needed. */ | |
0e115563 DG |
1147 | agent_filter = set_agent_filter(filter_expression, ev); |
1148 | if (!agent_filter) { | |
6e911cad | 1149 | if (!filter_expression) { |
9ae110e2 JG |
1150 | /* |
1151 | * No JUL and no filter, just skip | |
1152 | * everything below. | |
1153 | */ | |
6e911cad MD |
1154 | goto ask_sessiond; |
1155 | } | |
1156 | } else { | |
1157 | /* | |
9ae110e2 JG |
1158 | * With a JUL filter, the original filter has |
1159 | * been added to it thus replace the filter | |
1160 | * expression. | |
6e911cad | 1161 | */ |
0e115563 | 1162 | filter_expression = agent_filter; |
6e911cad MD |
1163 | free_filter_expression = 1; |
1164 | } | |
1165 | } | |
1166 | ||
1167 | ret = generate_filter(filter_expression, &lsm, &ctx); | |
1168 | if (ret) { | |
1169 | goto filter_error; | |
1170 | } | |
1171 | } | |
1172 | ||
1173 | varlen_data = zmalloc(lsm.u.disable.bytecode_len | |
1174 | + lsm.u.disable.expression_len); | |
1175 | if (!varlen_data) { | |
1176 | ret = -LTTNG_ERR_EXCLUSION_NOMEM; | |
1177 | goto mem_error; | |
1178 | } | |
1179 | ||
9ae110e2 | 1180 | /* Add filter expression. */ |
6e911cad MD |
1181 | if (lsm.u.disable.expression_len != 0) { |
1182 | memcpy(varlen_data, | |
1183 | filter_expression, | |
1184 | lsm.u.disable.expression_len); | |
1185 | } | |
9ae110e2 | 1186 | /* Add filter bytecode next. */ |
6e911cad MD |
1187 | if (ctx && lsm.u.disable.bytecode_len != 0) { |
1188 | memcpy(varlen_data | |
1189 | + lsm.u.disable.expression_len, | |
1190 | &ctx->bytecode->b, | |
1191 | lsm.u.disable.bytecode_len); | |
1192 | } | |
1193 | ||
1194 | ret = lttng_ctl_ask_sessiond_varlen(&lsm, varlen_data, | |
1195 | lsm.u.disable.bytecode_len + lsm.u.disable.expression_len, NULL); | |
1196 | free(varlen_data); | |
1197 | ||
1198 | mem_error: | |
1199 | if (filter_expression && ctx) { | |
1200 | filter_bytecode_free(ctx); | |
1201 | filter_ir_free(ctx); | |
1202 | filter_parser_ctx_free(ctx); | |
1203 | } | |
1204 | filter_error: | |
1205 | if (free_filter_expression) { | |
1206 | /* | |
9ae110e2 JG |
1207 | * The filter expression has been replaced and must be freed as |
1208 | * it is not the original filter expression received as a | |
1209 | * parameter. | |
6e911cad MD |
1210 | */ |
1211 | free(filter_expression); | |
1212 | } | |
1213 | error: | |
1214 | /* | |
9ae110e2 JG |
1215 | * Return directly to the caller and don't ask the sessiond since |
1216 | * something went wrong in the parsing of data above. | |
6e911cad MD |
1217 | */ |
1218 | return ret; | |
1219 | ||
1220 | ask_sessiond: | |
1221 | ret = lttng_ctl_ask_sessiond(&lsm, NULL); | |
1222 | return ret; | |
1223 | } | |
1224 | ||
1225 | /* | |
9ae110e2 JG |
1226 | * Disable event(s) of a channel and domain. |
1227 | * If no event name is specified, all events are disabled. | |
1228 | * If no channel name is specified, the default 'channel0' is used. | |
1229 | * Returns size of returned session payload data or a negative error code. | |
6e911cad MD |
1230 | */ |
1231 | int lttng_disable_event(struct lttng_handle *handle, const char *name, | |
1232 | const char *channel_name) | |
1233 | { | |
1234 | struct lttng_event ev; | |
1235 | ||
1236 | memset(&ev, 0, sizeof(ev)); | |
9b7431cf | 1237 | ev.loglevel = -1; |
6e911cad MD |
1238 | ev.type = LTTNG_EVENT_ALL; |
1239 | lttng_ctl_copy_string(ev.name, name, sizeof(ev.name)); | |
1240 | return lttng_disable_event_ext(handle, &ev, channel_name, NULL); | |
1df4dedd DG |
1241 | } |
1242 | ||
1243 | /* | |
9ae110e2 JG |
1244 | * Enable channel per domain |
1245 | * Returns size of returned session payload data or a negative error code. | |
a5c5a2bd | 1246 | */ |
cd80958d | 1247 | int lttng_enable_channel(struct lttng_handle *handle, |
38057ed1 | 1248 | struct lttng_channel *chan) |
a5c5a2bd | 1249 | { |
cd80958d DG |
1250 | struct lttcomm_session_msg lsm; |
1251 | ||
9ae110e2 | 1252 | /* NULL arguments are forbidden. No default values. */ |
5117eeec | 1253 | if (handle == NULL || chan == NULL) { |
2f70b271 | 1254 | return -LTTNG_ERR_INVALID; |
cd80958d DG |
1255 | } |
1256 | ||
441c16a7 MD |
1257 | memset(&lsm, 0, sizeof(lsm)); |
1258 | ||
5117eeec | 1259 | memcpy(&lsm.u.channel.chan, chan, sizeof(lsm.u.channel.chan)); |
7d29a247 | 1260 | |
cd80958d DG |
1261 | lsm.cmd_type = LTTNG_ENABLE_CHANNEL; |
1262 | ||
cac3069d | 1263 | lttng_ctl_copy_lttng_domain(&lsm.domain, &handle->domain); |
7d29a247 | 1264 | |
cac3069d | 1265 | lttng_ctl_copy_string(lsm.session.name, handle->session_name, |
cd80958d DG |
1266 | sizeof(lsm.session.name)); |
1267 | ||
cac3069d | 1268 | return lttng_ctl_ask_sessiond(&lsm, NULL); |
8c0faa1d | 1269 | } |
1df4dedd | 1270 | |
2ef84c95 | 1271 | /* |
9ae110e2 JG |
1272 | * All tracing will be stopped for registered events of the channel. |
1273 | * Returns size of returned session payload data or a negative error code. | |
2ef84c95 | 1274 | */ |
cd80958d | 1275 | int lttng_disable_channel(struct lttng_handle *handle, const char *name) |
2ef84c95 | 1276 | { |
cd80958d DG |
1277 | struct lttcomm_session_msg lsm; |
1278 | ||
9ae110e2 | 1279 | /* Safety check. Both are mandatory. */ |
9d697d3d | 1280 | if (handle == NULL || name == NULL) { |
2f70b271 | 1281 | return -LTTNG_ERR_INVALID; |
cd80958d DG |
1282 | } |
1283 | ||
441c16a7 MD |
1284 | memset(&lsm, 0, sizeof(lsm)); |
1285 | ||
cd80958d | 1286 | lsm.cmd_type = LTTNG_DISABLE_CHANNEL; |
1df4dedd | 1287 | |
cac3069d | 1288 | lttng_ctl_copy_string(lsm.u.disable.channel_name, name, |
9d697d3d DG |
1289 | sizeof(lsm.u.disable.channel_name)); |
1290 | ||
cac3069d | 1291 | lttng_ctl_copy_lttng_domain(&lsm.domain, &handle->domain); |
cd80958d | 1292 | |
cac3069d | 1293 | lttng_ctl_copy_string(lsm.session.name, handle->session_name, |
cd80958d DG |
1294 | sizeof(lsm.session.name)); |
1295 | ||
cac3069d | 1296 | return lttng_ctl_ask_sessiond(&lsm, NULL); |
ca95a216 DG |
1297 | } |
1298 | ||
ccf10263 | 1299 | /* |
9ae110e2 JG |
1300 | * Add PID to session tracker. |
1301 | * Return 0 on success else a negative LTTng error code. | |
ccf10263 MD |
1302 | */ |
1303 | int lttng_track_pid(struct lttng_handle *handle, int pid) | |
1304 | { | |
1305 | struct lttcomm_session_msg lsm; | |
1306 | ||
9ae110e2 | 1307 | /* NULL arguments are forbidden. No default values. */ |
ccf10263 MD |
1308 | if (handle == NULL) { |
1309 | return -LTTNG_ERR_INVALID; | |
1310 | } | |
1311 | ||
1312 | memset(&lsm, 0, sizeof(lsm)); | |
1313 | ||
1314 | lsm.cmd_type = LTTNG_TRACK_PID; | |
1315 | lsm.u.pid_tracker.pid = pid; | |
1316 | ||
1317 | lttng_ctl_copy_lttng_domain(&lsm.domain, &handle->domain); | |
1318 | ||
1319 | lttng_ctl_copy_string(lsm.session.name, handle->session_name, | |
1320 | sizeof(lsm.session.name)); | |
1321 | ||
1322 | return lttng_ctl_ask_sessiond(&lsm, NULL); | |
1323 | } | |
1324 | ||
1325 | /* | |
9ae110e2 JG |
1326 | * Remove PID from session tracker. |
1327 | * Return 0 on success else a negative LTTng error code. | |
ccf10263 MD |
1328 | */ |
1329 | int lttng_untrack_pid(struct lttng_handle *handle, int pid) | |
1330 | { | |
1331 | struct lttcomm_session_msg lsm; | |
1332 | ||
9ae110e2 | 1333 | /* NULL arguments are forbidden. No default values. */ |
ccf10263 MD |
1334 | if (handle == NULL) { |
1335 | return -LTTNG_ERR_INVALID; | |
1336 | } | |
1337 | ||
1338 | memset(&lsm, 0, sizeof(lsm)); | |
1339 | ||
1340 | lsm.cmd_type = LTTNG_UNTRACK_PID; | |
1341 | lsm.u.pid_tracker.pid = pid; | |
1342 | ||
1343 | lttng_ctl_copy_lttng_domain(&lsm.domain, &handle->domain); | |
1344 | ||
1345 | lttng_ctl_copy_string(lsm.session.name, handle->session_name, | |
1346 | sizeof(lsm.session.name)); | |
1347 | ||
1348 | return lttng_ctl_ask_sessiond(&lsm, NULL); | |
1349 | } | |
1350 | ||
fac6795d | 1351 | /* |
9ae110e2 JG |
1352 | * Lists all available tracepoints of domain. |
1353 | * Sets the contents of the events array. | |
1354 | * Returns the number of lttng_event entries in events; | |
1355 | * on error, returns a negative value. | |
fac6795d | 1356 | */ |
cd80958d | 1357 | int lttng_list_tracepoints(struct lttng_handle *handle, |
2a71efd5 | 1358 | struct lttng_event **events) |
fac6795d | 1359 | { |
052da939 | 1360 | int ret; |
cd80958d DG |
1361 | struct lttcomm_session_msg lsm; |
1362 | ||
9d697d3d | 1363 | if (handle == NULL) { |
2f70b271 | 1364 | return -LTTNG_ERR_INVALID; |
cd80958d | 1365 | } |
fac6795d | 1366 | |
53efb85a | 1367 | memset(&lsm, 0, sizeof(lsm)); |
cd80958d | 1368 | lsm.cmd_type = LTTNG_LIST_TRACEPOINTS; |
cac3069d | 1369 | lttng_ctl_copy_lttng_domain(&lsm.domain, &handle->domain); |
2a71efd5 | 1370 | |
cac3069d | 1371 | ret = lttng_ctl_ask_sessiond(&lsm, (void **) events); |
052da939 DG |
1372 | if (ret < 0) { |
1373 | return ret; | |
eb354453 | 1374 | } |
fac6795d | 1375 | |
9f19cc17 | 1376 | return ret / sizeof(struct lttng_event); |
fac6795d DG |
1377 | } |
1378 | ||
f37d259d | 1379 | /* |
9ae110e2 JG |
1380 | * Lists all available tracepoint fields of domain. |
1381 | * Sets the contents of the event field array. | |
1382 | * Returns the number of lttng_event_field entries in events; | |
1383 | * on error, returns a negative value. | |
f37d259d MD |
1384 | */ |
1385 | int lttng_list_tracepoint_fields(struct lttng_handle *handle, | |
1386 | struct lttng_event_field **fields) | |
1387 | { | |
1388 | int ret; | |
1389 | struct lttcomm_session_msg lsm; | |
1390 | ||
1391 | if (handle == NULL) { | |
2f70b271 | 1392 | return -LTTNG_ERR_INVALID; |
f37d259d MD |
1393 | } |
1394 | ||
53efb85a | 1395 | memset(&lsm, 0, sizeof(lsm)); |
f37d259d | 1396 | lsm.cmd_type = LTTNG_LIST_TRACEPOINT_FIELDS; |
cac3069d | 1397 | lttng_ctl_copy_lttng_domain(&lsm.domain, &handle->domain); |
f37d259d | 1398 | |
cac3069d | 1399 | ret = lttng_ctl_ask_sessiond(&lsm, (void **) fields); |
f37d259d MD |
1400 | if (ret < 0) { |
1401 | return ret; | |
1402 | } | |
1403 | ||
1404 | return ret / sizeof(struct lttng_event_field); | |
1405 | } | |
1406 | ||
834978fd | 1407 | /* |
9ae110e2 JG |
1408 | * Lists all available kernel system calls. Allocates and sets the contents of |
1409 | * the events array. | |
834978fd | 1410 | * |
9ae110e2 JG |
1411 | * Returns the number of lttng_event entries in events; on error, returns a |
1412 | * negative value. | |
834978fd DG |
1413 | */ |
1414 | int lttng_list_syscalls(struct lttng_event **events) | |
1415 | { | |
1416 | int ret; | |
1417 | struct lttcomm_session_msg lsm; | |
1418 | ||
1419 | if (!events) { | |
1420 | return -LTTNG_ERR_INVALID; | |
1421 | } | |
1422 | ||
1423 | memset(&lsm, 0, sizeof(lsm)); | |
1424 | lsm.cmd_type = LTTNG_LIST_SYSCALLS; | |
1425 | /* Force kernel domain for system calls. */ | |
1426 | lsm.domain.type = LTTNG_DOMAIN_KERNEL; | |
1427 | ||
1428 | ret = lttng_ctl_ask_sessiond(&lsm, (void **) events); | |
1429 | if (ret < 0) { | |
1430 | return ret; | |
1431 | } | |
1432 | ||
1433 | return ret / sizeof(struct lttng_event); | |
1434 | } | |
1435 | ||
1657e9bb | 1436 | /* |
9ae110e2 JG |
1437 | * Returns a human readable string describing |
1438 | * the error code (a negative value). | |
1657e9bb | 1439 | */ |
9a745bc7 | 1440 | const char *lttng_strerror(int code) |
1657e9bb | 1441 | { |
f73fabfd | 1442 | return error_get_str(code); |
1657e9bb DG |
1443 | } |
1444 | ||
aaf97519 | 1445 | /* |
a4b92340 DG |
1446 | * Create a brand new session using name and url for destination. |
1447 | * | |
f73fabfd | 1448 | * Returns LTTNG_OK on success or a negative error code. |
00e2e675 | 1449 | */ |
a4b92340 | 1450 | int lttng_create_session(const char *name, const char *url) |
00e2e675 | 1451 | { |
3dd05a85 | 1452 | int ret; |
a4b92340 | 1453 | ssize_t size; |
00e2e675 | 1454 | struct lttcomm_session_msg lsm; |
a4b92340 | 1455 | struct lttng_uri *uris = NULL; |
00e2e675 | 1456 | |
a4b92340 | 1457 | if (name == NULL) { |
2f70b271 | 1458 | return -LTTNG_ERR_INVALID; |
00e2e675 DG |
1459 | } |
1460 | ||
a4b92340 | 1461 | memset(&lsm, 0, sizeof(lsm)); |
00e2e675 | 1462 | |
a4b92340 | 1463 | lsm.cmd_type = LTTNG_CREATE_SESSION; |
cac3069d | 1464 | lttng_ctl_copy_string(lsm.session.name, name, sizeof(lsm.session.name)); |
a4b92340 DG |
1465 | |
1466 | /* There should never be a data URL */ | |
bc894455 | 1467 | size = uri_parse_str_urls(url, NULL, &uris); |
a4b92340 | 1468 | if (size < 0) { |
2f70b271 | 1469 | return -LTTNG_ERR_INVALID; |
00e2e675 DG |
1470 | } |
1471 | ||
a4b92340 DG |
1472 | lsm.u.uri.size = size; |
1473 | ||
cac3069d DG |
1474 | ret = lttng_ctl_ask_sessiond_varlen(&lsm, uris, |
1475 | sizeof(struct lttng_uri) * size, NULL); | |
3dd05a85 DG |
1476 | |
1477 | free(uris); | |
1478 | return ret; | |
00e2e675 DG |
1479 | } |
1480 | ||
8028d920 | 1481 | /* |
9ae110e2 JG |
1482 | * Destroy session using name. |
1483 | * Returns size of returned session payload data or a negative error code. | |
8028d920 | 1484 | */ |
843f5df9 | 1485 | int lttng_destroy_session(const char *session_name) |
8028d920 | 1486 | { |
cd80958d DG |
1487 | struct lttcomm_session_msg lsm; |
1488 | ||
843f5df9 | 1489 | if (session_name == NULL) { |
2f70b271 | 1490 | return -LTTNG_ERR_INVALID; |
cd80958d DG |
1491 | } |
1492 | ||
53efb85a | 1493 | memset(&lsm, 0, sizeof(lsm)); |
cd80958d | 1494 | lsm.cmd_type = LTTNG_DESTROY_SESSION; |
843f5df9 | 1495 | |
cac3069d DG |
1496 | lttng_ctl_copy_string(lsm.session.name, session_name, |
1497 | sizeof(lsm.session.name)); | |
cd80958d | 1498 | |
cac3069d | 1499 | return lttng_ctl_ask_sessiond(&lsm, NULL); |
aaf97519 DG |
1500 | } |
1501 | ||
57167058 | 1502 | /* |
9ae110e2 JG |
1503 | * Ask the session daemon for all available sessions. |
1504 | * Sets the contents of the sessions array. | |
1505 | * Returns the number of lttng_session entries in sessions; | |
1506 | * on error, returns a negative value. | |
57167058 | 1507 | */ |
ca95a216 | 1508 | int lttng_list_sessions(struct lttng_session **sessions) |
57167058 | 1509 | { |
ca95a216 | 1510 | int ret; |
cd80958d | 1511 | struct lttcomm_session_msg lsm; |
57167058 | 1512 | |
53efb85a | 1513 | memset(&lsm, 0, sizeof(lsm)); |
cd80958d | 1514 | lsm.cmd_type = LTTNG_LIST_SESSIONS; |
cac3069d | 1515 | ret = lttng_ctl_ask_sessiond(&lsm, (void**) sessions); |
57167058 | 1516 | if (ret < 0) { |
ca95a216 | 1517 | return ret; |
57167058 DG |
1518 | } |
1519 | ||
ca95a216 | 1520 | return ret / sizeof(struct lttng_session); |
57167058 DG |
1521 | } |
1522 | ||
d7ba1388 MD |
1523 | int lttng_set_session_shm_path(const char *session_name, |
1524 | const char *shm_path) | |
1525 | { | |
1526 | struct lttcomm_session_msg lsm; | |
1527 | ||
1528 | if (session_name == NULL) { | |
1529 | return -LTTNG_ERR_INVALID; | |
1530 | } | |
1531 | ||
1532 | memset(&lsm, 0, sizeof(lsm)); | |
1533 | lsm.cmd_type = LTTNG_SET_SESSION_SHM_PATH; | |
1534 | ||
1535 | lttng_ctl_copy_string(lsm.session.name, session_name, | |
1536 | sizeof(lsm.session.name)); | |
1537 | lttng_ctl_copy_string(lsm.u.set_shm_path.shm_path, shm_path, | |
1538 | sizeof(lsm.u.set_shm_path.shm_path)); | |
1539 | ||
1540 | return lttng_ctl_ask_sessiond(&lsm, NULL); | |
1541 | } | |
1542 | ||
9f19cc17 | 1543 | /* |
9ae110e2 JG |
1544 | * Ask the session daemon for all available domains of a session. |
1545 | * Sets the contents of the domains array. | |
1546 | * Returns the number of lttng_domain entries in domains; | |
1547 | * on error, returns a negative value. | |
9f19cc17 | 1548 | */ |
330be774 | 1549 | int lttng_list_domains(const char *session_name, |
cd80958d | 1550 | struct lttng_domain **domains) |
9f19cc17 DG |
1551 | { |
1552 | int ret; | |
cd80958d DG |
1553 | struct lttcomm_session_msg lsm; |
1554 | ||
330be774 | 1555 | if (session_name == NULL) { |
2f70b271 | 1556 | return -LTTNG_ERR_INVALID; |
cd80958d | 1557 | } |
9f19cc17 | 1558 | |
53efb85a | 1559 | memset(&lsm, 0, sizeof(lsm)); |
cd80958d DG |
1560 | lsm.cmd_type = LTTNG_LIST_DOMAINS; |
1561 | ||
cac3069d DG |
1562 | lttng_ctl_copy_string(lsm.session.name, session_name, |
1563 | sizeof(lsm.session.name)); | |
cd80958d | 1564 | |
cac3069d | 1565 | ret = lttng_ctl_ask_sessiond(&lsm, (void**) domains); |
9f19cc17 DG |
1566 | if (ret < 0) { |
1567 | return ret; | |
1568 | } | |
1569 | ||
1570 | return ret / sizeof(struct lttng_domain); | |
1571 | } | |
1572 | ||
1573 | /* | |
9ae110e2 JG |
1574 | * Ask the session daemon for all available channels of a session. |
1575 | * Sets the contents of the channels array. | |
1576 | * Returns the number of lttng_channel entries in channels; | |
1577 | * on error, returns a negative value. | |
9f19cc17 | 1578 | */ |
cd80958d DG |
1579 | int lttng_list_channels(struct lttng_handle *handle, |
1580 | struct lttng_channel **channels) | |
9f19cc17 DG |
1581 | { |
1582 | int ret; | |
cd80958d DG |
1583 | struct lttcomm_session_msg lsm; |
1584 | ||
9d697d3d | 1585 | if (handle == NULL) { |
2f70b271 | 1586 | return -LTTNG_ERR_INVALID; |
cd80958d DG |
1587 | } |
1588 | ||
53efb85a | 1589 | memset(&lsm, 0, sizeof(lsm)); |
cd80958d | 1590 | lsm.cmd_type = LTTNG_LIST_CHANNELS; |
cac3069d | 1591 | lttng_ctl_copy_string(lsm.session.name, handle->session_name, |
cd80958d | 1592 | sizeof(lsm.session.name)); |
9f19cc17 | 1593 | |
cac3069d | 1594 | lttng_ctl_copy_lttng_domain(&lsm.domain, &handle->domain); |
9f19cc17 | 1595 | |
cac3069d | 1596 | ret = lttng_ctl_ask_sessiond(&lsm, (void**) channels); |
9f19cc17 DG |
1597 | if (ret < 0) { |
1598 | return ret; | |
1599 | } | |
1600 | ||
1601 | return ret / sizeof(struct lttng_channel); | |
1602 | } | |
1603 | ||
1604 | /* | |
9ae110e2 JG |
1605 | * Ask the session daemon for all available events of a session channel. |
1606 | * Sets the contents of the events array. | |
1607 | * Returns the number of lttng_event entries in events; | |
1608 | * on error, returns a negative value. | |
9f19cc17 | 1609 | */ |
cd80958d DG |
1610 | int lttng_list_events(struct lttng_handle *handle, |
1611 | const char *channel_name, struct lttng_event **events) | |
9f19cc17 DG |
1612 | { |
1613 | int ret; | |
cd80958d | 1614 | struct lttcomm_session_msg lsm; |
9f19cc17 | 1615 | |
9d697d3d DG |
1616 | /* Safety check. An handle and channel name are mandatory */ |
1617 | if (handle == NULL || channel_name == NULL) { | |
2f70b271 | 1618 | return -LTTNG_ERR_INVALID; |
cd80958d DG |
1619 | } |
1620 | ||
53efb85a | 1621 | memset(&lsm, 0, sizeof(lsm)); |
cd80958d | 1622 | lsm.cmd_type = LTTNG_LIST_EVENTS; |
cac3069d | 1623 | lttng_ctl_copy_string(lsm.session.name, handle->session_name, |
cd80958d | 1624 | sizeof(lsm.session.name)); |
cac3069d | 1625 | lttng_ctl_copy_string(lsm.u.list.channel_name, channel_name, |
cd80958d DG |
1626 | sizeof(lsm.u.list.channel_name)); |
1627 | ||
cac3069d | 1628 | lttng_ctl_copy_lttng_domain(&lsm.domain, &handle->domain); |
9f19cc17 | 1629 | |
cac3069d | 1630 | ret = lttng_ctl_ask_sessiond(&lsm, (void**) events); |
9f19cc17 DG |
1631 | if (ret < 0) { |
1632 | return ret; | |
1633 | } | |
1634 | ||
1635 | return ret / sizeof(struct lttng_event); | |
1636 | } | |
1637 | ||
fac6795d | 1638 | /* |
1c8d13c8 TD |
1639 | * Sets the tracing_group variable with name. |
1640 | * This function allocates memory pointed to by tracing_group. | |
1641 | * On success, returns 0, on error, returns -1 (null name) or -ENOMEM. | |
fac6795d DG |
1642 | */ |
1643 | int lttng_set_tracing_group(const char *name) | |
1644 | { | |
9d697d3d | 1645 | if (name == NULL) { |
2f70b271 | 1646 | return -LTTNG_ERR_INVALID; |
9d697d3d DG |
1647 | } |
1648 | ||
fac6795d | 1649 | if (asprintf(&tracing_group, "%s", name) < 0) { |
2f70b271 | 1650 | return -LTTNG_ERR_FATAL; |
fac6795d DG |
1651 | } |
1652 | ||
1653 | return 0; | |
1654 | } | |
1655 | ||
d0254c7c | 1656 | /* |
af87c45a | 1657 | * Returns size of returned session payload data or a negative error code. |
d0254c7c | 1658 | */ |
cd80958d | 1659 | int lttng_calibrate(struct lttng_handle *handle, |
d0254c7c MD |
1660 | struct lttng_calibrate *calibrate) |
1661 | { | |
cd80958d | 1662 | struct lttcomm_session_msg lsm; |
d0254c7c | 1663 | |
9d697d3d DG |
1664 | /* Safety check. NULL pointer are forbidden */ |
1665 | if (handle == NULL || calibrate == NULL) { | |
2f70b271 | 1666 | return -LTTNG_ERR_INVALID; |
cd80958d | 1667 | } |
d0254c7c | 1668 | |
53efb85a | 1669 | memset(&lsm, 0, sizeof(lsm)); |
cd80958d | 1670 | lsm.cmd_type = LTTNG_CALIBRATE; |
cac3069d | 1671 | lttng_ctl_copy_lttng_domain(&lsm.domain, &handle->domain); |
d0254c7c | 1672 | |
cd80958d DG |
1673 | memcpy(&lsm.u.calibrate, calibrate, sizeof(lsm.u.calibrate)); |
1674 | ||
cac3069d | 1675 | return lttng_ctl_ask_sessiond(&lsm, NULL); |
d0254c7c MD |
1676 | } |
1677 | ||
5edd7e09 DG |
1678 | /* |
1679 | * Set default channel attributes. | |
441c16a7 | 1680 | * If either or both of the arguments are null, attr content is zeroe'd. |
5edd7e09 DG |
1681 | */ |
1682 | void lttng_channel_set_default_attr(struct lttng_domain *domain, | |
1683 | struct lttng_channel_attr *attr) | |
1684 | { | |
1685 | /* Safety check */ | |
1686 | if (attr == NULL || domain == NULL) { | |
1687 | return; | |
1688 | } | |
1689 | ||
eacaa7a6 DS |
1690 | memset(attr, 0, sizeof(struct lttng_channel_attr)); |
1691 | ||
0a9c6494 DG |
1692 | /* Same for all domains. */ |
1693 | attr->overwrite = DEFAULT_CHANNEL_OVERWRITE; | |
1694 | attr->tracefile_size = DEFAULT_CHANNEL_TRACEFILE_SIZE; | |
1695 | attr->tracefile_count = DEFAULT_CHANNEL_TRACEFILE_COUNT; | |
1696 | ||
5edd7e09 DG |
1697 | switch (domain->type) { |
1698 | case LTTNG_DOMAIN_KERNEL: | |
9ae110e2 JG |
1699 | attr->switch_timer_interval = |
1700 | DEFAULT_KERNEL_CHANNEL_SWITCH_TIMER; | |
d92ff3ef | 1701 | attr->read_timer_interval = DEFAULT_KERNEL_CHANNEL_READ_TIMER; |
3e230f92 | 1702 | attr->subbuf_size = default_get_kernel_channel_subbuf_size(); |
5edd7e09 DG |
1703 | attr->num_subbuf = DEFAULT_KERNEL_CHANNEL_SUBBUF_NUM; |
1704 | attr->output = DEFAULT_KERNEL_CHANNEL_OUTPUT; | |
1705 | break; | |
1706 | case LTTNG_DOMAIN_UST: | |
0a9c6494 DG |
1707 | switch (domain->buf_type) { |
1708 | case LTTNG_BUFFER_PER_UID: | |
1709 | attr->subbuf_size = default_get_ust_uid_channel_subbuf_size(); | |
1710 | attr->num_subbuf = DEFAULT_UST_UID_CHANNEL_SUBBUF_NUM; | |
1711 | attr->output = DEFAULT_UST_UID_CHANNEL_OUTPUT; | |
9ae110e2 JG |
1712 | attr->switch_timer_interval = |
1713 | DEFAULT_UST_UID_CHANNEL_SWITCH_TIMER; | |
1714 | attr->read_timer_interval = | |
1715 | DEFAULT_UST_UID_CHANNEL_READ_TIMER; | |
0a9c6494 DG |
1716 | break; |
1717 | case LTTNG_BUFFER_PER_PID: | |
1718 | default: | |
1719 | attr->subbuf_size = default_get_ust_pid_channel_subbuf_size(); | |
1720 | attr->num_subbuf = DEFAULT_UST_PID_CHANNEL_SUBBUF_NUM; | |
1721 | attr->output = DEFAULT_UST_PID_CHANNEL_OUTPUT; | |
9ae110e2 JG |
1722 | attr->switch_timer_interval = |
1723 | DEFAULT_UST_PID_CHANNEL_SWITCH_TIMER; | |
1724 | attr->read_timer_interval = | |
1725 | DEFAULT_UST_PID_CHANNEL_READ_TIMER; | |
0a9c6494 DG |
1726 | break; |
1727 | } | |
5edd7e09 | 1728 | default: |
441c16a7 | 1729 | /* Default behavior: leave set to 0. */ |
5edd7e09 DG |
1730 | break; |
1731 | } | |
1732 | } | |
1733 | ||
fac6795d | 1734 | /* |
2269e89e | 1735 | * Check if session daemon is alive. |
fac6795d | 1736 | * |
2269e89e | 1737 | * Return 1 if alive or 0 if not. |
1c8d13c8 | 1738 | * On error returns a negative value. |
fac6795d | 1739 | */ |
947308c4 | 1740 | int lttng_session_daemon_alive(void) |
fac6795d DG |
1741 | { |
1742 | int ret; | |
1743 | ||
1744 | ret = set_session_daemon_path(); | |
1745 | if (ret < 0) { | |
9ae110e2 | 1746 | /* Error. */ |
fac6795d DG |
1747 | return ret; |
1748 | } | |
1749 | ||
9d035200 | 1750 | if (*sessiond_sock_path == '\0') { |
2f70b271 | 1751 | /* |
9ae110e2 JG |
1752 | * No socket path set. Weird error which means the constructor |
1753 | * was not called. | |
2f70b271 DG |
1754 | */ |
1755 | assert(0); | |
fac6795d DG |
1756 | } |
1757 | ||
2269e89e | 1758 | ret = try_connect_sessiond(sessiond_sock_path); |
7d8234d9 | 1759 | if (ret < 0) { |
9ae110e2 | 1760 | /* Not alive. */ |
7d8234d9 MD |
1761 | return 0; |
1762 | } | |
7d8234d9 | 1763 | |
9ae110e2 | 1764 | /* Is alive. */ |
947308c4 | 1765 | return 1; |
fac6795d DG |
1766 | } |
1767 | ||
00e2e675 | 1768 | /* |
a4b92340 | 1769 | * Set URL for a consumer for a session and domain. |
00e2e675 DG |
1770 | * |
1771 | * Return 0 on success, else a negative value. | |
1772 | */ | |
a4b92340 DG |
1773 | int lttng_set_consumer_url(struct lttng_handle *handle, |
1774 | const char *control_url, const char *data_url) | |
00e2e675 | 1775 | { |
3dd05a85 | 1776 | int ret; |
a4b92340 | 1777 | ssize_t size; |
00e2e675 | 1778 | struct lttcomm_session_msg lsm; |
a4b92340 | 1779 | struct lttng_uri *uris = NULL; |
00e2e675 | 1780 | |
a4b92340 | 1781 | if (handle == NULL || (control_url == NULL && data_url == NULL)) { |
2f70b271 | 1782 | return -LTTNG_ERR_INVALID; |
00e2e675 DG |
1783 | } |
1784 | ||
a4b92340 DG |
1785 | memset(&lsm, 0, sizeof(lsm)); |
1786 | ||
00e2e675 DG |
1787 | lsm.cmd_type = LTTNG_SET_CONSUMER_URI; |
1788 | ||
cac3069d | 1789 | lttng_ctl_copy_string(lsm.session.name, handle->session_name, |
00e2e675 | 1790 | sizeof(lsm.session.name)); |
cac3069d | 1791 | lttng_ctl_copy_lttng_domain(&lsm.domain, &handle->domain); |
00e2e675 | 1792 | |
bc894455 | 1793 | size = uri_parse_str_urls(control_url, data_url, &uris); |
a4b92340 | 1794 | if (size < 0) { |
2f70b271 | 1795 | return -LTTNG_ERR_INVALID; |
a4b92340 DG |
1796 | } |
1797 | ||
1798 | lsm.u.uri.size = size; | |
00e2e675 | 1799 | |
cac3069d DG |
1800 | ret = lttng_ctl_ask_sessiond_varlen(&lsm, uris, |
1801 | sizeof(struct lttng_uri) * size, NULL); | |
3dd05a85 DG |
1802 | |
1803 | free(uris); | |
1804 | return ret; | |
00e2e675 DG |
1805 | } |
1806 | ||
1807 | /* | |
9c6bda17 | 1808 | * [OBSOLETE] |
00e2e675 DG |
1809 | */ |
1810 | int lttng_enable_consumer(struct lttng_handle *handle) | |
1811 | { | |
785d2d0d | 1812 | return -ENOSYS; |
00e2e675 DG |
1813 | } |
1814 | ||
1815 | /* | |
9c6bda17 | 1816 | * [OBSOLETE] |
00e2e675 DG |
1817 | */ |
1818 | int lttng_disable_consumer(struct lttng_handle *handle) | |
1819 | { | |
785d2d0d | 1820 | return -ENOSYS; |
00e2e675 DG |
1821 | } |
1822 | ||
07424f16 DG |
1823 | /* |
1824 | * This is an extension of create session that is ONLY and SHOULD only be used | |
1825 | * by the lttng command line program. It exists to avoid using URI parsing in | |
1826 | * the lttng client. | |
1827 | * | |
1828 | * We need the date and time for the trace path subdirectory for the case where | |
1829 | * the user does NOT define one using either -o or -U. Using the normal | |
1830 | * lttng_create_session API call, we have no clue on the session daemon side if | |
1831 | * the URL was generated automatically by the client or define by the user. | |
1832 | * | |
1833 | * So this function "wrapper" is hidden from the public API, takes the datetime | |
1834 | * string and appends it if necessary to the URI subdirectory before sending it | |
1835 | * to the session daemon. | |
1836 | * | |
1837 | * With this extra function, the lttng_create_session call behavior is not | |
1838 | * changed and the timestamp is appended to the URI on the session daemon side | |
1839 | * if necessary. | |
1840 | */ | |
1841 | int _lttng_create_session_ext(const char *name, const char *url, | |
1842 | const char *datetime) | |
1843 | { | |
3dd05a85 | 1844 | int ret; |
07424f16 DG |
1845 | ssize_t size; |
1846 | struct lttcomm_session_msg lsm; | |
1847 | struct lttng_uri *uris = NULL; | |
1848 | ||
2bba9e53 | 1849 | if (name == NULL || datetime == NULL) { |
2f70b271 | 1850 | return -LTTNG_ERR_INVALID; |
07424f16 DG |
1851 | } |
1852 | ||
1853 | memset(&lsm, 0, sizeof(lsm)); | |
1854 | ||
1855 | lsm.cmd_type = LTTNG_CREATE_SESSION; | |
cac3069d | 1856 | lttng_ctl_copy_string(lsm.session.name, name, sizeof(lsm.session.name)); |
07424f16 | 1857 | |
9ae110e2 | 1858 | /* There should never be a data URL. */ |
bc894455 | 1859 | size = uri_parse_str_urls(url, NULL, &uris); |
07424f16 | 1860 | if (size < 0) { |
3dd05a85 DG |
1861 | ret = -LTTNG_ERR_INVALID; |
1862 | goto error; | |
07424f16 DG |
1863 | } |
1864 | ||
1865 | lsm.u.uri.size = size; | |
1866 | ||
4b35a6b3 | 1867 | if (size > 0 && uris[0].dtype != LTTNG_DST_PATH && strlen(uris[0].subdir) == 0) { |
da4aa2b8 DG |
1868 | /* Don't append datetime if the name was automatically created. */ |
1869 | if (strncmp(name, DEFAULT_SESSION_NAME "-", | |
1870 | strlen(DEFAULT_SESSION_NAME) + 1)) { | |
1871 | ret = snprintf(uris[0].subdir, sizeof(uris[0].subdir), "%s-%s", | |
1872 | name, datetime); | |
1873 | } else { | |
1874 | ret = snprintf(uris[0].subdir, sizeof(uris[0].subdir), "%s", name); | |
1875 | } | |
07424f16 DG |
1876 | if (ret < 0) { |
1877 | PERROR("snprintf uri subdir"); | |
3dd05a85 DG |
1878 | ret = -LTTNG_ERR_FATAL; |
1879 | goto error; | |
07424f16 DG |
1880 | } |
1881 | } | |
1882 | ||
cac3069d DG |
1883 | ret = lttng_ctl_ask_sessiond_varlen(&lsm, uris, |
1884 | sizeof(struct lttng_uri) * size, NULL); | |
3dd05a85 DG |
1885 | |
1886 | error: | |
1887 | free(uris); | |
1888 | return ret; | |
07424f16 DG |
1889 | } |
1890 | ||
806e2684 DG |
1891 | /* |
1892 | * For a given session name, this call checks if the data is ready to be read | |
1893 | * or is still being extracted by the consumer(s) hence not ready to be used by | |
1894 | * any readers. | |
1895 | */ | |
6d805429 | 1896 | int lttng_data_pending(const char *session_name) |
806e2684 DG |
1897 | { |
1898 | int ret; | |
1899 | struct lttcomm_session_msg lsm; | |
f6151c55 | 1900 | uint8_t *pending = NULL; |
806e2684 DG |
1901 | |
1902 | if (session_name == NULL) { | |
1903 | return -LTTNG_ERR_INVALID; | |
1904 | } | |
1905 | ||
53efb85a | 1906 | memset(&lsm, 0, sizeof(lsm)); |
6d805429 | 1907 | lsm.cmd_type = LTTNG_DATA_PENDING; |
806e2684 | 1908 | |
cac3069d DG |
1909 | lttng_ctl_copy_string(lsm.session.name, session_name, |
1910 | sizeof(lsm.session.name)); | |
806e2684 | 1911 | |
f6151c55 JG |
1912 | ret = lttng_ctl_ask_sessiond(&lsm, (void **) &pending); |
1913 | if (ret < 0) { | |
1914 | goto end; | |
1915 | } else if (ret != 1) { | |
1916 | /* Unexpected payload size */ | |
1917 | ret = -LTTNG_ERR_INVALID; | |
1918 | goto end; | |
806e2684 DG |
1919 | } |
1920 | ||
f6151c55 JG |
1921 | ret = (int) *pending; |
1922 | end: | |
1923 | free(pending); | |
806e2684 DG |
1924 | return ret; |
1925 | } | |
1926 | ||
27babd3a DG |
1927 | /* |
1928 | * Create a session exclusively used for snapshot. | |
1929 | * | |
1930 | * Returns LTTNG_OK on success or a negative error code. | |
1931 | */ | |
1932 | int lttng_create_session_snapshot(const char *name, const char *snapshot_url) | |
1933 | { | |
1934 | int ret; | |
1935 | ssize_t size; | |
1936 | struct lttcomm_session_msg lsm; | |
1937 | struct lttng_uri *uris = NULL; | |
1938 | ||
1939 | if (name == NULL) { | |
1940 | return -LTTNG_ERR_INVALID; | |
1941 | } | |
1942 | ||
1943 | memset(&lsm, 0, sizeof(lsm)); | |
1944 | ||
1945 | lsm.cmd_type = LTTNG_CREATE_SESSION_SNAPSHOT; | |
1946 | lttng_ctl_copy_string(lsm.session.name, name, sizeof(lsm.session.name)); | |
1947 | ||
1948 | size = uri_parse_str_urls(snapshot_url, NULL, &uris); | |
1949 | if (size < 0) { | |
1950 | return -LTTNG_ERR_INVALID; | |
1951 | } | |
1952 | ||
1953 | lsm.u.uri.size = size; | |
1954 | ||
1955 | ret = lttng_ctl_ask_sessiond_varlen(&lsm, uris, | |
1956 | sizeof(struct lttng_uri) * size, NULL); | |
1957 | ||
1958 | free(uris); | |
1959 | return ret; | |
1960 | } | |
1961 | ||
ecc48a90 JD |
1962 | /* |
1963 | * Create a session exclusively used for live. | |
1964 | * | |
1965 | * Returns LTTNG_OK on success or a negative error code. | |
1966 | */ | |
1967 | int lttng_create_session_live(const char *name, const char *url, | |
1968 | unsigned int timer_interval) | |
1969 | { | |
1970 | int ret; | |
1971 | ssize_t size; | |
1972 | struct lttcomm_session_msg lsm; | |
1973 | struct lttng_uri *uris = NULL; | |
1974 | ||
92805ee4 | 1975 | if (name == NULL || timer_interval == 0) { |
ecc48a90 JD |
1976 | return -LTTNG_ERR_INVALID; |
1977 | } | |
1978 | ||
1979 | memset(&lsm, 0, sizeof(lsm)); | |
1980 | ||
1981 | lsm.cmd_type = LTTNG_CREATE_SESSION_LIVE; | |
1982 | lttng_ctl_copy_string(lsm.session.name, name, sizeof(lsm.session.name)); | |
1983 | ||
1a241656 DG |
1984 | if (url) { |
1985 | size = uri_parse_str_urls(url, NULL, &uris); | |
1986 | if (size <= 0) { | |
1987 | ret = -LTTNG_ERR_INVALID; | |
1988 | goto end; | |
1989 | } | |
ecc48a90 | 1990 | |
1a241656 DG |
1991 | /* file:// is not accepted for live session. */ |
1992 | if (uris[0].dtype == LTTNG_DST_PATH) { | |
1993 | ret = -LTTNG_ERR_INVALID; | |
1994 | goto end; | |
1995 | } | |
1996 | } else { | |
1997 | size = 0; | |
ecc48a90 JD |
1998 | } |
1999 | ||
2000 | lsm.u.session_live.nb_uri = size; | |
2001 | lsm.u.session_live.timer_interval = timer_interval; | |
2002 | ||
2003 | ret = lttng_ctl_ask_sessiond_varlen(&lsm, uris, | |
2004 | sizeof(struct lttng_uri) * size, NULL); | |
2005 | ||
2006 | end: | |
2007 | free(uris); | |
2008 | return ret; | |
2009 | } | |
2010 | ||
a5dfbb9d MD |
2011 | /* |
2012 | * List PIDs in the tracker. | |
2013 | * | |
1b18ce93 JG |
2014 | * enabled is set to whether the PID tracker is enabled. |
2015 | * pids is set to an allocated array of PIDs currently tracked. On | |
2016 | * success, pids must be freed by the caller. | |
2017 | * nr_pids is set to the number of entries contained by the pids array. | |
a5dfbb9d MD |
2018 | * |
2019 | * Returns 0 on success, else a negative LTTng error code. | |
2020 | */ | |
2021 | int lttng_list_tracker_pids(struct lttng_handle *handle, | |
2022 | int *_enabled, int32_t **_pids, size_t *_nr_pids) | |
2023 | { | |
ebbf5ab7 JR |
2024 | int ret; |
2025 | int enabled = 1; | |
a5dfbb9d MD |
2026 | struct lttcomm_session_msg lsm; |
2027 | size_t nr_pids; | |
2028 | int32_t *pids; | |
2029 | ||
2030 | if (handle == NULL) { | |
2031 | return -LTTNG_ERR_INVALID; | |
2032 | } | |
2033 | ||
2034 | memset(&lsm, 0, sizeof(lsm)); | |
2035 | lsm.cmd_type = LTTNG_LIST_TRACKER_PIDS; | |
2036 | lttng_ctl_copy_string(lsm.session.name, handle->session_name, | |
2037 | sizeof(lsm.session.name)); | |
2038 | lttng_ctl_copy_lttng_domain(&lsm.domain, &handle->domain); | |
2039 | ||
2040 | ret = lttng_ctl_ask_sessiond(&lsm, (void **) &pids); | |
2041 | if (ret < 0) { | |
2042 | return ret; | |
2043 | } | |
2044 | nr_pids = ret / sizeof(int32_t); | |
2045 | if (nr_pids == 1 && pids[0] == -1) { | |
2046 | free(pids); | |
2047 | pids = NULL; | |
2048 | enabled = 0; | |
2049 | nr_pids = 0; | |
2050 | } | |
2051 | *_enabled = enabled; | |
2052 | *_pids = pids; | |
2053 | *_nr_pids = nr_pids; | |
2054 | return 0; | |
2055 | } | |
2056 | ||
fac6795d | 2057 | /* |
9ae110e2 | 2058 | * lib constructor. |
fac6795d DG |
2059 | */ |
2060 | static void __attribute__((constructor)) init() | |
2061 | { | |
2062 | /* Set default session group */ | |
bbccc3d2 | 2063 | lttng_set_tracing_group(DEFAULT_TRACING_GROUP); |
fac6795d | 2064 | } |
49cca668 DG |
2065 | |
2066 | /* | |
9ae110e2 | 2067 | * lib destructor. |
49cca668 DG |
2068 | */ |
2069 | static void __attribute__((destructor)) lttng_ctl_exit() | |
2070 | { | |
2071 | free(tracing_group); | |
2072 | } |