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 | |
6c1c0768 | 23 | #define _LGPL_SOURCE |
44a5e5eb | 24 | #include <assert.h> |
fac6795d | 25 | #include <grp.h> |
1e307fab | 26 | #include <errno.h> |
fac6795d DG |
27 | #include <stdio.h> |
28 | #include <stdlib.h> | |
29 | #include <string.h> | |
30 | #include <unistd.h> | |
31 | ||
990570ed DG |
32 | #include <common/common.h> |
33 | #include <common/defaults.h> | |
db758600 | 34 | #include <common/sessiond-comm/sessiond-comm.h> |
a4b92340 | 35 | #include <common/uri.h> |
feb0f3e5 | 36 | #include <common/utils.h> |
1e307fab | 37 | #include <lttng/lttng.h> |
0c89d795 | 38 | #include <lttng/health-internal.h> |
fac6795d | 39 | |
d00c599e DG |
40 | #include "filter/filter-ast.h" |
41 | #include "filter/filter-parser.h" | |
42 | #include "filter/filter-bytecode.h" | |
43 | #include "filter/memstream.h" | |
cac3069d | 44 | #include "lttng-ctl-helper.h" |
53a80697 MD |
45 | |
46 | #ifdef DEBUG | |
d00c599e | 47 | static const int print_xml = 1; |
53a80697 MD |
48 | #define dbg_printf(fmt, args...) \ |
49 | printf("[debug liblttng-ctl] " fmt, ## args) | |
50 | #else | |
d00c599e | 51 | static const int print_xml = 0; |
53a80697 MD |
52 | #define dbg_printf(fmt, args...) \ |
53 | do { \ | |
54 | /* do nothing but check printf format */ \ | |
55 | if (0) \ | |
56 | printf("[debug liblttnctl] " fmt, ## args); \ | |
57 | } while (0) | |
58 | #endif | |
59 | ||
60 | ||
fac6795d DG |
61 | /* Socket to session daemon for communication */ |
62 | static int sessiond_socket; | |
63 | static char sessiond_sock_path[PATH_MAX]; | |
64 | ||
fac6795d DG |
65 | /* Variables */ |
66 | static char *tracing_group; | |
67 | static int connected; | |
68 | ||
97e19046 DG |
69 | /* Global */ |
70 | ||
71 | /* | |
72 | * Those two variables are used by error.h to silent or control the verbosity of | |
73 | * error message. They are global to the library so application linking with it | |
74 | * are able to compile correctly and also control verbosity of the library. | |
97e19046 DG |
75 | */ |
76 | int lttng_opt_quiet; | |
77 | int lttng_opt_verbose; | |
c7e35b03 | 78 | int lttng_opt_mi; |
97e19046 | 79 | |
99497cd0 MD |
80 | /* |
81 | * Copy string from src to dst and enforce null terminated byte. | |
82 | */ | |
cac3069d DG |
83 | LTTNG_HIDDEN |
84 | void lttng_ctl_copy_string(char *dst, const char *src, size_t len) | |
99497cd0 | 85 | { |
e7d6716d | 86 | if (src && dst) { |
99497cd0 MD |
87 | strncpy(dst, src, len); |
88 | /* Enforce the NULL terminated byte */ | |
89 | dst[len - 1] = '\0'; | |
cd80958d DG |
90 | } else if (dst) { |
91 | dst[0] = '\0'; | |
99497cd0 MD |
92 | } |
93 | } | |
94 | ||
fac6795d | 95 | /* |
cd80958d | 96 | * Copy domain to lttcomm_session_msg domain. |
fac6795d | 97 | * |
cd80958d DG |
98 | * If domain is unknown, default domain will be the kernel. |
99 | */ | |
cac3069d DG |
100 | LTTNG_HIDDEN |
101 | void lttng_ctl_copy_lttng_domain(struct lttng_domain *dst, | |
102 | struct lttng_domain *src) | |
cd80958d DG |
103 | { |
104 | if (src && dst) { | |
105 | switch (src->type) { | |
00e2e675 DG |
106 | case LTTNG_DOMAIN_KERNEL: |
107 | case LTTNG_DOMAIN_UST: | |
b9dfb167 | 108 | case LTTNG_DOMAIN_JUL: |
5cdb6027 | 109 | case LTTNG_DOMAIN_LOG4J: |
0e115563 | 110 | case LTTNG_DOMAIN_PYTHON: |
00e2e675 DG |
111 | memcpy(dst, src, sizeof(struct lttng_domain)); |
112 | break; | |
113 | default: | |
114 | memset(dst, 0, sizeof(struct lttng_domain)); | |
00e2e675 | 115 | break; |
cd80958d DG |
116 | } |
117 | } | |
118 | } | |
119 | ||
120 | /* | |
121 | * Send lttcomm_session_msg to the session daemon. | |
fac6795d | 122 | * |
1c8d13c8 TD |
123 | * On success, returns the number of bytes sent (>=0) |
124 | * On error, returns -1 | |
fac6795d | 125 | */ |
cd80958d | 126 | static int send_session_msg(struct lttcomm_session_msg *lsm) |
fac6795d DG |
127 | { |
128 | int ret; | |
129 | ||
130 | if (!connected) { | |
2f70b271 | 131 | ret = -LTTNG_ERR_NO_SESSIOND; |
e065084a | 132 | goto end; |
fac6795d DG |
133 | } |
134 | ||
a4b92340 DG |
135 | DBG("LSM cmd type : %d", lsm->cmd_type); |
136 | ||
be040666 | 137 | ret = lttcomm_send_creds_unix_sock(sessiond_socket, lsm, |
cd80958d | 138 | sizeof(struct lttcomm_session_msg)); |
2f70b271 DG |
139 | if (ret < 0) { |
140 | ret = -LTTNG_ERR_FATAL; | |
141 | } | |
e065084a DG |
142 | |
143 | end: | |
144 | return ret; | |
145 | } | |
146 | ||
53a80697 MD |
147 | /* |
148 | * Send var len data to the session daemon. | |
149 | * | |
150 | * On success, returns the number of bytes sent (>=0) | |
151 | * On error, returns -1 | |
152 | */ | |
153 | static int send_session_varlen(void *data, size_t len) | |
154 | { | |
155 | int ret; | |
156 | ||
157 | if (!connected) { | |
2f70b271 | 158 | ret = -LTTNG_ERR_NO_SESSIOND; |
53a80697 MD |
159 | goto end; |
160 | } | |
a4b92340 | 161 | |
53a80697 MD |
162 | if (!data || !len) { |
163 | ret = 0; | |
164 | goto end; | |
165 | } | |
166 | ||
167 | ret = lttcomm_send_unix_sock(sessiond_socket, data, len); | |
2f70b271 DG |
168 | if (ret < 0) { |
169 | ret = -LTTNG_ERR_FATAL; | |
170 | } | |
53a80697 MD |
171 | |
172 | end: | |
173 | return ret; | |
174 | } | |
175 | ||
e065084a | 176 | /* |
cd80958d | 177 | * Receive data from the sessiond socket. |
e065084a | 178 | * |
1c8d13c8 TD |
179 | * On success, returns the number of bytes received (>=0) |
180 | * On error, returns -1 (recvmsg() error) or -ENOTCONN | |
e065084a | 181 | */ |
ca95a216 | 182 | static int recv_data_sessiond(void *buf, size_t len) |
e065084a DG |
183 | { |
184 | int ret; | |
185 | ||
186 | if (!connected) { | |
2f70b271 | 187 | ret = -LTTNG_ERR_NO_SESSIOND; |
e065084a | 188 | goto end; |
fac6795d DG |
189 | } |
190 | ||
ca95a216 | 191 | ret = lttcomm_recv_unix_sock(sessiond_socket, buf, len); |
2f70b271 DG |
192 | if (ret < 0) { |
193 | ret = -LTTNG_ERR_FATAL; | |
194 | } | |
fac6795d | 195 | |
e065084a | 196 | end: |
fac6795d DG |
197 | return ret; |
198 | } | |
199 | ||
200 | /* | |
1c8d13c8 | 201 | * Check if we are in the specified group. |
65beb5ff | 202 | * |
2269e89e | 203 | * If yes return 1, else return -1. |
947308c4 | 204 | */ |
6c71277b MD |
205 | LTTNG_HIDDEN |
206 | int lttng_check_tracing_group(void) | |
947308c4 DG |
207 | { |
208 | struct group *grp_tracing; /* no free(). See getgrnam(3) */ | |
209 | gid_t *grp_list; | |
210 | int grp_list_size, grp_id, i; | |
211 | int ret = -1; | |
6c71277b | 212 | const char *grp_name = tracing_group; |
947308c4 DG |
213 | |
214 | /* Get GID of group 'tracing' */ | |
215 | grp_tracing = getgrnam(grp_name); | |
b4d8603b MD |
216 | if (!grp_tracing) { |
217 | /* If grp_tracing is NULL, the group does not exist. */ | |
947308c4 DG |
218 | goto end; |
219 | } | |
220 | ||
221 | /* Get number of supplementary group IDs */ | |
222 | grp_list_size = getgroups(0, NULL); | |
223 | if (grp_list_size < 0) { | |
6f04ed72 | 224 | PERROR("getgroups"); |
947308c4 DG |
225 | goto end; |
226 | } | |
227 | ||
228 | /* Alloc group list of the right size */ | |
3f451dc0 | 229 | grp_list = zmalloc(grp_list_size * sizeof(gid_t)); |
00795392 | 230 | if (!grp_list) { |
6f04ed72 | 231 | PERROR("malloc"); |
00795392 MD |
232 | goto end; |
233 | } | |
947308c4 | 234 | grp_id = getgroups(grp_list_size, grp_list); |
1c8d13c8 | 235 | if (grp_id < 0) { |
6f04ed72 | 236 | PERROR("getgroups"); |
947308c4 DG |
237 | goto free_list; |
238 | } | |
239 | ||
240 | for (i = 0; i < grp_list_size; i++) { | |
241 | if (grp_list[i] == grp_tracing->gr_gid) { | |
2269e89e | 242 | ret = 1; |
947308c4 DG |
243 | break; |
244 | } | |
245 | } | |
246 | ||
247 | free_list: | |
248 | free(grp_list); | |
249 | ||
250 | end: | |
251 | return ret; | |
252 | } | |
253 | ||
254 | /* | |
2269e89e DG |
255 | * Try connect to session daemon with sock_path. |
256 | * | |
257 | * Return 0 on success, else -1 | |
258 | */ | |
259 | static int try_connect_sessiond(const char *sock_path) | |
260 | { | |
261 | int ret; | |
262 | ||
263 | /* If socket exist, we check if the daemon listens for connect. */ | |
264 | ret = access(sock_path, F_OK); | |
265 | if (ret < 0) { | |
266 | /* Not alive */ | |
2f70b271 | 267 | goto error; |
2269e89e DG |
268 | } |
269 | ||
270 | ret = lttcomm_connect_unix_sock(sock_path); | |
271 | if (ret < 0) { | |
272 | /* Not alive */ | |
2f70b271 | 273 | goto error; |
2269e89e DG |
274 | } |
275 | ||
276 | ret = lttcomm_close_unix_sock(ret); | |
277 | if (ret < 0) { | |
6f04ed72 | 278 | PERROR("lttcomm_close_unix_sock"); |
2269e89e DG |
279 | } |
280 | ||
281 | return 0; | |
2f70b271 DG |
282 | |
283 | error: | |
284 | return -1; | |
2269e89e DG |
285 | } |
286 | ||
287 | /* | |
2f70b271 DG |
288 | * Set sessiond socket path by putting it in the global sessiond_sock_path |
289 | * variable. | |
290 | * | |
291 | * Returns 0 on success, negative value on failure (the sessiond socket path | |
292 | * is somehow too long or ENOMEM). | |
947308c4 DG |
293 | */ |
294 | static int set_session_daemon_path(void) | |
295 | { | |
2269e89e DG |
296 | int in_tgroup = 0; /* In tracing group */ |
297 | uid_t uid; | |
298 | ||
299 | uid = getuid(); | |
947308c4 | 300 | |
2269e89e DG |
301 | if (uid != 0) { |
302 | /* Are we in the tracing group ? */ | |
6c71277b | 303 | in_tgroup = lttng_check_tracing_group(); |
2269e89e DG |
304 | } |
305 | ||
08a9c49f | 306 | if ((uid == 0) || in_tgroup) { |
cac3069d DG |
307 | lttng_ctl_copy_string(sessiond_sock_path, |
308 | DEFAULT_GLOBAL_CLIENT_UNIX_SOCK, sizeof(sessiond_sock_path)); | |
08a9c49f | 309 | } |
2269e89e | 310 | |
08a9c49f | 311 | if (uid != 0) { |
c617c0c6 MD |
312 | int ret; |
313 | ||
08a9c49f TD |
314 | if (in_tgroup) { |
315 | /* Tracing group */ | |
316 | ret = try_connect_sessiond(sessiond_sock_path); | |
317 | if (ret >= 0) { | |
318 | goto end; | |
2269e89e | 319 | } |
08a9c49f | 320 | /* Global session daemon not available... */ |
2269e89e | 321 | } |
08a9c49f TD |
322 | /* ...or not in tracing group (and not root), default */ |
323 | ||
324 | /* | |
325 | * With GNU C < 2.1, snprintf returns -1 if the target buffer is too small; | |
326 | * With GNU C >= 2.1, snprintf returns the required size (excluding closing null) | |
327 | */ | |
328 | ret = snprintf(sessiond_sock_path, sizeof(sessiond_sock_path), | |
feb0f3e5 | 329 | DEFAULT_HOME_CLIENT_UNIX_SOCK, utils_get_home_dir()); |
08a9c49f | 330 | if ((ret < 0) || (ret >= sizeof(sessiond_sock_path))) { |
2f70b271 | 331 | goto error; |
947308c4 | 332 | } |
947308c4 | 333 | } |
08a9c49f | 334 | end: |
947308c4 | 335 | return 0; |
2f70b271 DG |
336 | |
337 | error: | |
338 | return -1; | |
947308c4 DG |
339 | } |
340 | ||
65beb5ff DG |
341 | /* |
342 | * Connect to the LTTng session daemon. | |
343 | * | |
344 | * On success, return 0. On error, return -1. | |
345 | */ | |
346 | static int connect_sessiond(void) | |
347 | { | |
348 | int ret; | |
349 | ||
da3c9ec1 DG |
350 | /* Don't try to connect if already connected. */ |
351 | if (connected) { | |
352 | return 0; | |
353 | } | |
354 | ||
65beb5ff DG |
355 | ret = set_session_daemon_path(); |
356 | if (ret < 0) { | |
2f70b271 | 357 | goto error; |
65beb5ff DG |
358 | } |
359 | ||
360 | /* Connect to the sesssion daemon */ | |
361 | ret = lttcomm_connect_unix_sock(sessiond_sock_path); | |
362 | if (ret < 0) { | |
2f70b271 | 363 | goto error; |
65beb5ff DG |
364 | } |
365 | ||
366 | sessiond_socket = ret; | |
367 | connected = 1; | |
368 | ||
369 | return 0; | |
2f70b271 DG |
370 | |
371 | error: | |
372 | return -1; | |
65beb5ff DG |
373 | } |
374 | ||
375 | /* | |
1c8d13c8 TD |
376 | * Clean disconnect from the session daemon. |
377 | * On success, return 0. On error, return -1. | |
65beb5ff DG |
378 | */ |
379 | static int disconnect_sessiond(void) | |
380 | { | |
381 | int ret = 0; | |
382 | ||
383 | if (connected) { | |
384 | ret = lttcomm_close_unix_sock(sessiond_socket); | |
385 | sessiond_socket = 0; | |
386 | connected = 0; | |
387 | } | |
388 | ||
389 | return ret; | |
390 | } | |
391 | ||
35a6fdb7 | 392 | /* |
cd80958d | 393 | * Ask the session daemon a specific command and put the data into buf. |
53a80697 | 394 | * Takes extra var. len. data as input to send to the session daemon. |
65beb5ff | 395 | * |
af87c45a | 396 | * Return size of data (only payload, not header) or a negative error code. |
65beb5ff | 397 | */ |
cac3069d DG |
398 | LTTNG_HIDDEN |
399 | int lttng_ctl_ask_sessiond_varlen(struct lttcomm_session_msg *lsm, | |
a4b92340 | 400 | void *vardata, size_t varlen, void **buf) |
65beb5ff DG |
401 | { |
402 | int ret; | |
403 | size_t size; | |
404 | void *data = NULL; | |
cd80958d | 405 | struct lttcomm_lttng_msg llm; |
65beb5ff DG |
406 | |
407 | ret = connect_sessiond(); | |
408 | if (ret < 0) { | |
2f70b271 | 409 | ret = -LTTNG_ERR_NO_SESSIOND; |
65beb5ff DG |
410 | goto end; |
411 | } | |
412 | ||
65beb5ff | 413 | /* Send command to session daemon */ |
cd80958d | 414 | ret = send_session_msg(lsm); |
65beb5ff | 415 | if (ret < 0) { |
2f70b271 | 416 | /* Ret value is a valid lttng error code. */ |
65beb5ff DG |
417 | goto end; |
418 | } | |
53a80697 MD |
419 | /* Send var len data */ |
420 | ret = send_session_varlen(vardata, varlen); | |
421 | if (ret < 0) { | |
2f70b271 | 422 | /* Ret value is a valid lttng error code. */ |
53a80697 MD |
423 | goto end; |
424 | } | |
65beb5ff DG |
425 | |
426 | /* Get header from data transmission */ | |
427 | ret = recv_data_sessiond(&llm, sizeof(llm)); | |
428 | if (ret < 0) { | |
2f70b271 | 429 | /* Ret value is a valid lttng error code. */ |
65beb5ff DG |
430 | goto end; |
431 | } | |
432 | ||
433 | /* Check error code if OK */ | |
f73fabfd | 434 | if (llm.ret_code != LTTNG_OK) { |
65beb5ff DG |
435 | ret = -llm.ret_code; |
436 | goto end; | |
437 | } | |
438 | ||
439 | size = llm.data_size; | |
440 | if (size == 0) { | |
874d3f84 | 441 | /* If client free with size 0 */ |
a45d5536 DG |
442 | if (buf != NULL) { |
443 | *buf = NULL; | |
444 | } | |
7d29a247 | 445 | ret = 0; |
65beb5ff DG |
446 | goto end; |
447 | } | |
448 | ||
3f451dc0 MD |
449 | data = zmalloc(size); |
450 | if (!data) { | |
451 | ret = -ENOMEM; | |
452 | goto end; | |
453 | } | |
65beb5ff DG |
454 | |
455 | /* Get payload data */ | |
456 | ret = recv_data_sessiond(data, size); | |
457 | if (ret < 0) { | |
458 | free(data); | |
459 | goto end; | |
460 | } | |
461 | ||
83009e5e DG |
462 | /* |
463 | * Extra protection not to dereference a NULL pointer. If buf is NULL at | |
464 | * this point, an error is returned and data is freed. | |
465 | */ | |
466 | if (buf == NULL) { | |
2f70b271 | 467 | ret = -LTTNG_ERR_INVALID; |
83009e5e DG |
468 | free(data); |
469 | goto end; | |
470 | } | |
471 | ||
65beb5ff DG |
472 | *buf = data; |
473 | ret = size; | |
474 | ||
475 | end: | |
476 | disconnect_sessiond(); | |
477 | return ret; | |
478 | } | |
479 | ||
9f19cc17 | 480 | /* |
cd80958d | 481 | * Create lttng handle and return pointer. |
1c8d13c8 | 482 | * The returned pointer will be NULL in case of malloc() error. |
9f19cc17 | 483 | */ |
cd80958d DG |
484 | struct lttng_handle *lttng_create_handle(const char *session_name, |
485 | struct lttng_domain *domain) | |
9f19cc17 | 486 | { |
2f70b271 DG |
487 | struct lttng_handle *handle = NULL; |
488 | ||
489 | if (domain == NULL) { | |
490 | goto end; | |
491 | } | |
cd80958d | 492 | |
3f451dc0 | 493 | handle = zmalloc(sizeof(struct lttng_handle)); |
cd80958d | 494 | if (handle == NULL) { |
2f70b271 | 495 | PERROR("malloc handle"); |
cd80958d DG |
496 | goto end; |
497 | } | |
498 | ||
499 | /* Copy session name */ | |
cac3069d | 500 | lttng_ctl_copy_string(handle->session_name, session_name, |
cd80958d DG |
501 | sizeof(handle->session_name)); |
502 | ||
503 | /* Copy lttng domain */ | |
cac3069d | 504 | lttng_ctl_copy_lttng_domain(&handle->domain, domain); |
cd80958d DG |
505 | |
506 | end: | |
507 | return handle; | |
508 | } | |
509 | ||
510 | /* | |
511 | * Destroy handle by free(3) the pointer. | |
512 | */ | |
513 | void lttng_destroy_handle(struct lttng_handle *handle) | |
514 | { | |
0e428499 | 515 | free(handle); |
eb354453 DG |
516 | } |
517 | ||
d9800920 DG |
518 | /* |
519 | * Register an outside consumer. | |
1c8d13c8 | 520 | * Returns size of returned session payload data or a negative error code. |
d9800920 DG |
521 | */ |
522 | int lttng_register_consumer(struct lttng_handle *handle, | |
523 | const char *socket_path) | |
524 | { | |
525 | struct lttcomm_session_msg lsm; | |
526 | ||
2f70b271 DG |
527 | if (handle == NULL || socket_path == NULL) { |
528 | return -LTTNG_ERR_INVALID; | |
529 | } | |
530 | ||
53efb85a | 531 | memset(&lsm, 0, sizeof(lsm)); |
d9800920 | 532 | lsm.cmd_type = LTTNG_REGISTER_CONSUMER; |
cac3069d | 533 | lttng_ctl_copy_string(lsm.session.name, handle->session_name, |
d9800920 | 534 | sizeof(lsm.session.name)); |
cac3069d | 535 | lttng_ctl_copy_lttng_domain(&lsm.domain, &handle->domain); |
d9800920 | 536 | |
cac3069d | 537 | lttng_ctl_copy_string(lsm.u.reg.path, socket_path, sizeof(lsm.u.reg.path)); |
d9800920 | 538 | |
cac3069d | 539 | return lttng_ctl_ask_sessiond(&lsm, NULL); |
d9800920 DG |
540 | } |
541 | ||
1df4dedd | 542 | /* |
1c8d13c8 TD |
543 | * Start tracing for all traces of the session. |
544 | * Returns size of returned session payload data or a negative error code. | |
1df4dedd | 545 | */ |
6a4f824d | 546 | int lttng_start_tracing(const char *session_name) |
f3ed775e | 547 | { |
cd80958d DG |
548 | struct lttcomm_session_msg lsm; |
549 | ||
6a4f824d | 550 | if (session_name == NULL) { |
2f70b271 | 551 | return -LTTNG_ERR_INVALID; |
cd80958d DG |
552 | } |
553 | ||
53efb85a | 554 | memset(&lsm, 0, sizeof(lsm)); |
cd80958d | 555 | lsm.cmd_type = LTTNG_START_TRACE; |
6a4f824d | 556 | |
cac3069d DG |
557 | lttng_ctl_copy_string(lsm.session.name, session_name, |
558 | sizeof(lsm.session.name)); | |
cd80958d | 559 | |
cac3069d | 560 | return lttng_ctl_ask_sessiond(&lsm, NULL); |
f3ed775e | 561 | } |
1df4dedd DG |
562 | |
563 | /* | |
38ee087f | 564 | * Stop tracing for all traces of the session. |
f3ed775e | 565 | */ |
38ee087f | 566 | static int _lttng_stop_tracing(const char *session_name, int wait) |
f3ed775e | 567 | { |
38ee087f | 568 | int ret, data_ret; |
cd80958d DG |
569 | struct lttcomm_session_msg lsm; |
570 | ||
6a4f824d | 571 | if (session_name == NULL) { |
2f70b271 | 572 | return -LTTNG_ERR_INVALID; |
6a4f824d DG |
573 | } |
574 | ||
53efb85a | 575 | memset(&lsm, 0, sizeof(lsm)); |
cd80958d | 576 | lsm.cmd_type = LTTNG_STOP_TRACE; |
6a4f824d | 577 | |
cac3069d DG |
578 | lttng_ctl_copy_string(lsm.session.name, session_name, |
579 | sizeof(lsm.session.name)); | |
cd80958d | 580 | |
cac3069d | 581 | ret = lttng_ctl_ask_sessiond(&lsm, NULL); |
38ee087f DG |
582 | if (ret < 0 && ret != -LTTNG_ERR_TRACE_ALREADY_STOPPED) { |
583 | goto error; | |
584 | } | |
585 | ||
586 | if (!wait) { | |
587 | goto end; | |
588 | } | |
589 | ||
38ee087f DG |
590 | /* Check for data availability */ |
591 | do { | |
6d805429 | 592 | data_ret = lttng_data_pending(session_name); |
38ee087f DG |
593 | if (data_ret < 0) { |
594 | /* Return the data available call error. */ | |
595 | ret = data_ret; | |
596 | goto error; | |
597 | } | |
598 | ||
599 | /* | |
600 | * Data sleep time before retrying (in usec). Don't sleep if the call | |
601 | * returned value indicates availability. | |
602 | */ | |
6d805429 | 603 | if (data_ret) { |
38ee087f | 604 | usleep(DEFAULT_DATA_AVAILABILITY_WAIT_TIME); |
38ee087f | 605 | } |
6d805429 | 606 | } while (data_ret != 0); |
38ee087f | 607 | |
38ee087f DG |
608 | end: |
609 | error: | |
610 | return ret; | |
611 | } | |
612 | ||
613 | /* | |
614 | * Stop tracing and wait for data availability. | |
615 | */ | |
616 | int lttng_stop_tracing(const char *session_name) | |
617 | { | |
618 | return _lttng_stop_tracing(session_name, 1); | |
619 | } | |
620 | ||
621 | /* | |
622 | * Stop tracing but _don't_ wait for data availability. | |
623 | */ | |
624 | int lttng_stop_tracing_no_wait(const char *session_name) | |
625 | { | |
626 | return _lttng_stop_tracing(session_name, 0); | |
f3ed775e DG |
627 | } |
628 | ||
629 | /* | |
601d5acf DG |
630 | * Add context to a channel. |
631 | * | |
632 | * If the given channel is NULL, add the contexts to all channels. | |
633 | * The event_name param is ignored. | |
af87c45a DG |
634 | * |
635 | * Returns the size of the returned payload data or a negative error code. | |
1df4dedd | 636 | */ |
cd80958d | 637 | int lttng_add_context(struct lttng_handle *handle, |
38057ed1 DG |
638 | struct lttng_event_context *ctx, const char *event_name, |
639 | const char *channel_name) | |
d65106b1 | 640 | { |
cd80958d DG |
641 | struct lttcomm_session_msg lsm; |
642 | ||
9d697d3d DG |
643 | /* Safety check. Both are mandatory */ |
644 | if (handle == NULL || ctx == NULL) { | |
2f70b271 | 645 | return -LTTNG_ERR_INVALID; |
cd80958d DG |
646 | } |
647 | ||
441c16a7 MD |
648 | memset(&lsm, 0, sizeof(lsm)); |
649 | ||
cd80958d DG |
650 | lsm.cmd_type = LTTNG_ADD_CONTEXT; |
651 | ||
85076754 MD |
652 | /* If no channel name, send empty string. */ |
653 | if (channel_name == NULL) { | |
654 | lttng_ctl_copy_string(lsm.u.context.channel_name, "", | |
655 | sizeof(lsm.u.context.channel_name)); | |
656 | } else { | |
657 | lttng_ctl_copy_string(lsm.u.context.channel_name, channel_name, | |
658 | sizeof(lsm.u.context.channel_name)); | |
659 | } | |
cd80958d | 660 | |
cac3069d | 661 | lttng_ctl_copy_lttng_domain(&lsm.domain, &handle->domain); |
d65106b1 | 662 | |
9d697d3d | 663 | memcpy(&lsm.u.context.ctx, ctx, sizeof(struct lttng_event_context)); |
d65106b1 | 664 | |
cac3069d | 665 | lttng_ctl_copy_string(lsm.session.name, handle->session_name, |
cd80958d DG |
666 | sizeof(lsm.session.name)); |
667 | ||
cac3069d | 668 | return lttng_ctl_ask_sessiond(&lsm, NULL); |
d65106b1 DG |
669 | } |
670 | ||
f3ed775e | 671 | /* |
1c8d13c8 TD |
672 | * Enable event(s) for a channel. |
673 | * If no event name is specified, all events are enabled. | |
674 | * If no channel name is specified, the default 'channel0' is used. | |
675 | * Returns size of returned session payload data or a negative error code. | |
f3ed775e | 676 | */ |
cd80958d | 677 | int lttng_enable_event(struct lttng_handle *handle, |
38057ed1 | 678 | struct lttng_event *ev, const char *channel_name) |
1df4dedd | 679 | { |
f8a96544 JI |
680 | return lttng_enable_event_with_exclusions(handle, ev, channel_name, |
681 | NULL, 0, NULL); | |
1df4dedd DG |
682 | } |
683 | ||
53a80697 | 684 | /* |
025faf73 | 685 | * Create or enable an event with a filter expression. |
178191b3 | 686 | * |
53a80697 MD |
687 | * Return negative error value on error. |
688 | * Return size of returned session payload data if OK. | |
689 | */ | |
025faf73 | 690 | int lttng_enable_event_with_filter(struct lttng_handle *handle, |
178191b3 | 691 | struct lttng_event *event, const char *channel_name, |
53a80697 MD |
692 | const char *filter_expression) |
693 | { | |
f8a96544 JI |
694 | return lttng_enable_event_with_exclusions(handle, event, channel_name, |
695 | filter_expression, 0, NULL); | |
53a80697 MD |
696 | } |
697 | ||
347c5ab5 | 698 | /* |
0e115563 | 699 | * Depending on the event, return a newly allocated agent filter expression or |
347c5ab5 DG |
700 | * NULL if not applicable. |
701 | * | |
702 | * An event with NO loglevel and the name is * will return NULL. | |
703 | */ | |
0e115563 | 704 | static char *set_agent_filter(const char *filter, struct lttng_event *ev) |
347c5ab5 DG |
705 | { |
706 | int err; | |
0e115563 | 707 | char *agent_filter = NULL; |
347c5ab5 DG |
708 | |
709 | assert(ev); | |
710 | ||
711 | /* Don't add filter for the '*' event. */ | |
712 | if (ev->name[0] != '*') { | |
713 | if (filter) { | |
0e115563 | 714 | err = asprintf(&agent_filter, "(%s) && (logger_name == \"%s\")", filter, |
347c5ab5 DG |
715 | ev->name); |
716 | } else { | |
0e115563 | 717 | err = asprintf(&agent_filter, "logger_name == \"%s\"", ev->name); |
347c5ab5 DG |
718 | } |
719 | if (err < 0) { | |
720 | PERROR("asprintf"); | |
6a556f7b | 721 | goto error; |
347c5ab5 DG |
722 | } |
723 | } | |
724 | ||
725 | /* Add loglevel filtering if any for the JUL domain. */ | |
726 | if (ev->loglevel_type != LTTNG_EVENT_LOGLEVEL_ALL) { | |
727 | char *op; | |
728 | ||
729 | if (ev->loglevel_type == LTTNG_EVENT_LOGLEVEL_RANGE) { | |
730 | op = ">="; | |
731 | } else { | |
732 | op = "=="; | |
733 | } | |
734 | ||
0e115563 | 735 | if (filter || agent_filter) { |
6a556f7b JG |
736 | char *new_filter; |
737 | ||
fb0edb23 | 738 | err = asprintf(&new_filter, "(%s) && (int_loglevel %s %d)", |
0e115563 | 739 | agent_filter ? agent_filter : filter, op, |
347c5ab5 | 740 | ev->loglevel); |
0e115563 DG |
741 | if (agent_filter) { |
742 | free(agent_filter); | |
6a556f7b | 743 | } |
0e115563 | 744 | agent_filter = new_filter; |
347c5ab5 | 745 | } else { |
0e115563 | 746 | err = asprintf(&agent_filter, "int_loglevel %s %d", op, |
347c5ab5 DG |
747 | ev->loglevel); |
748 | } | |
749 | if (err < 0) { | |
750 | PERROR("asprintf"); | |
6a556f7b | 751 | goto error; |
347c5ab5 DG |
752 | } |
753 | } | |
754 | ||
0e115563 | 755 | return agent_filter; |
6a556f7b | 756 | error: |
0e115563 | 757 | free(agent_filter); |
6a556f7b | 758 | return NULL; |
347c5ab5 DG |
759 | } |
760 | ||
137b9942 DG |
761 | /* |
762 | * Generate the filter bytecode from a give filter expression string. Put the | |
763 | * newly allocated parser context in ctxp and populate the lsm object with the | |
764 | * expression len. | |
765 | * | |
766 | * Return 0 on success else a LTTNG_ERR_* code and ctxp is untouched. | |
767 | */ | |
768 | static int generate_filter(char *filter_expression, | |
769 | struct lttcomm_session_msg *lsm, struct filter_parser_ctx **ctxp) | |
770 | { | |
771 | int ret; | |
772 | struct filter_parser_ctx *ctx = NULL; | |
773 | FILE *fmem = NULL; | |
774 | ||
775 | assert(filter_expression); | |
776 | assert(lsm); | |
777 | assert(ctxp); | |
778 | ||
779 | /* | |
780 | * Casting const to non-const, as the underlying function will use it in | |
781 | * read-only mode. | |
782 | */ | |
783 | fmem = lttng_fmemopen((void *) filter_expression, | |
784 | strlen(filter_expression), "r"); | |
785 | if (!fmem) { | |
786 | fprintf(stderr, "Error opening memory as stream\n"); | |
787 | ret = -LTTNG_ERR_FILTER_NOMEM; | |
788 | goto error; | |
789 | } | |
790 | ctx = filter_parser_ctx_alloc(fmem); | |
791 | if (!ctx) { | |
792 | fprintf(stderr, "Error allocating parser\n"); | |
793 | ret = -LTTNG_ERR_FILTER_NOMEM; | |
794 | goto filter_alloc_error; | |
795 | } | |
796 | ret = filter_parser_ctx_append_ast(ctx); | |
797 | if (ret) { | |
798 | fprintf(stderr, "Parse error\n"); | |
799 | ret = -LTTNG_ERR_FILTER_INVAL; | |
800 | goto parse_error; | |
801 | } | |
802 | ret = filter_visitor_set_parent(ctx); | |
803 | if (ret) { | |
804 | fprintf(stderr, "Set parent error\n"); | |
805 | ret = -LTTNG_ERR_FILTER_INVAL; | |
806 | goto parse_error; | |
807 | } | |
808 | if (print_xml) { | |
809 | ret = filter_visitor_print_xml(ctx, stdout, 0); | |
810 | if (ret) { | |
811 | fflush(stdout); | |
812 | fprintf(stderr, "XML print error\n"); | |
813 | ret = -LTTNG_ERR_FILTER_INVAL; | |
814 | goto parse_error; | |
815 | } | |
816 | } | |
817 | ||
818 | dbg_printf("Generating IR... "); | |
819 | fflush(stdout); | |
820 | ret = filter_visitor_ir_generate(ctx); | |
821 | if (ret) { | |
822 | fprintf(stderr, "Generate IR error\n"); | |
823 | ret = -LTTNG_ERR_FILTER_INVAL; | |
824 | goto parse_error; | |
825 | } | |
826 | dbg_printf("done\n"); | |
827 | ||
828 | dbg_printf("Validating IR... "); | |
829 | fflush(stdout); | |
830 | ret = filter_visitor_ir_check_binary_op_nesting(ctx); | |
831 | if (ret) { | |
832 | ret = -LTTNG_ERR_FILTER_INVAL; | |
833 | goto parse_error; | |
834 | } | |
dcd5daf2 JG |
835 | /* Validate strings used as literals in the expression */ |
836 | ret = filter_visitor_ir_validate_string(ctx); | |
837 | if (ret) { | |
838 | ret = -LTTNG_ERR_FILTER_INVAL; | |
839 | goto parse_error; | |
840 | } | |
137b9942 DG |
841 | dbg_printf("done\n"); |
842 | ||
843 | dbg_printf("Generating bytecode... "); | |
844 | fflush(stdout); | |
845 | ret = filter_visitor_bytecode_generate(ctx); | |
846 | if (ret) { | |
847 | fprintf(stderr, "Generate bytecode error\n"); | |
848 | ret = -LTTNG_ERR_FILTER_INVAL; | |
849 | goto parse_error; | |
850 | } | |
851 | dbg_printf("done\n"); | |
852 | dbg_printf("Size of bytecode generated: %u bytes.\n", | |
853 | bytecode_get_len(&ctx->bytecode->b)); | |
854 | ||
855 | lsm->u.enable.bytecode_len = sizeof(ctx->bytecode->b) | |
856 | + bytecode_get_len(&ctx->bytecode->b); | |
857 | lsm->u.enable.expression_len = strlen(filter_expression) + 1; | |
858 | ||
859 | /* No need to keep the memory stream. */ | |
860 | if (fclose(fmem) != 0) { | |
6f04ed72 | 861 | PERROR("fclose"); |
137b9942 DG |
862 | } |
863 | ||
864 | *ctxp = ctx; | |
865 | return 0; | |
866 | ||
867 | parse_error: | |
137b9942 DG |
868 | filter_ir_free(ctx); |
869 | filter_parser_ctx_free(ctx); | |
870 | filter_alloc_error: | |
871 | if (fclose(fmem) != 0) { | |
6f04ed72 | 872 | PERROR("fclose"); |
137b9942 DG |
873 | } |
874 | error: | |
875 | return ret; | |
876 | } | |
877 | ||
93deb080 JI |
878 | /* |
879 | * Enable event(s) for a channel, possibly with exclusions and a filter. | |
880 | * If no event name is specified, all events are enabled. | |
881 | * If no channel name is specified, the default name is used. | |
882 | * If filter expression is not NULL, the filter is set for the event. | |
883 | * If exclusion count is not zero, the exclusions are set for the event. | |
884 | * Returns size of returned session payload data or a negative error code. | |
885 | */ | |
886 | int lttng_enable_event_with_exclusions(struct lttng_handle *handle, | |
887 | struct lttng_event *ev, const char *channel_name, | |
e9efbcd3 | 888 | const char *original_filter_expression, |
93deb080 JI |
889 | int exclusion_count, char **exclusion_list) |
890 | { | |
891 | struct lttcomm_session_msg lsm; | |
64226865 | 892 | char *varlen_data; |
93deb080 | 893 | int ret = 0; |
137b9942 | 894 | unsigned int free_filter_expression = 0; |
93deb080 | 895 | struct filter_parser_ctx *ctx = NULL; |
e9efbcd3 JG |
896 | /* |
897 | * Cast as non-const since we may replace the filter expression | |
898 | * by a dynamically allocated string. Otherwise, the original | |
899 | * string is not modified. | |
900 | */ | |
901 | char *filter_expression = (char *) original_filter_expression; | |
93deb080 JI |
902 | |
903 | if (handle == NULL || ev == NULL) { | |
137b9942 DG |
904 | ret = -LTTNG_ERR_INVALID; |
905 | goto error; | |
93deb080 JI |
906 | } |
907 | ||
908 | /* Empty filter string will always be rejected by the parser | |
909 | * anyway, so treat this corner-case early to eliminate | |
910 | * lttng_fmemopen error for 0-byte allocation. | |
911 | */ | |
912 | if (filter_expression && filter_expression[0] == '\0') { | |
137b9942 DG |
913 | ret = -LTTNG_ERR_INVALID; |
914 | goto error; | |
93deb080 JI |
915 | } |
916 | ||
917 | memset(&lsm, 0, sizeof(lsm)); | |
918 | ||
919 | /* If no channel name, send empty string. */ | |
920 | if (channel_name == NULL) { | |
921 | lttng_ctl_copy_string(lsm.u.enable.channel_name, "", | |
922 | sizeof(lsm.u.enable.channel_name)); | |
923 | } else { | |
924 | lttng_ctl_copy_string(lsm.u.enable.channel_name, channel_name, | |
925 | sizeof(lsm.u.enable.channel_name)); | |
926 | } | |
927 | ||
18a720cd MD |
928 | lsm.cmd_type = LTTNG_ENABLE_EVENT; |
929 | if (ev->name[0] == '\0') { | |
930 | /* Enable all events */ | |
931 | lttng_ctl_copy_string(ev->name, "*", sizeof(ev->name)); | |
6565421f | 932 | } |
93deb080 | 933 | |
6565421f | 934 | lttng_ctl_copy_lttng_domain(&lsm.domain, &handle->domain); |
6e911cad | 935 | /* FIXME: copying non-packed struct to packed struct. */ |
93deb080 JI |
936 | memcpy(&lsm.u.enable.event, ev, sizeof(lsm.u.enable.event)); |
937 | ||
938 | lttng_ctl_copy_string(lsm.session.name, handle->session_name, | |
939 | sizeof(lsm.session.name)); | |
940 | lsm.u.enable.exclusion_count = exclusion_count; | |
941 | lsm.u.enable.bytecode_len = 0; | |
942 | ||
9b21e6d5 DG |
943 | /* |
944 | * For the JUL domain, a filter is enforced except for the enable all | |
945 | * event. This is done to avoid having the event in all sessions thus | |
946 | * filtering by logger name. | |
947 | */ | |
948 | if (exclusion_count == 0 && filter_expression == NULL && | |
5cdb6027 | 949 | (handle->domain.type != LTTNG_DOMAIN_JUL && |
0e115563 DG |
950 | handle->domain.type != LTTNG_DOMAIN_LOG4J && |
951 | handle->domain.type != LTTNG_DOMAIN_PYTHON)) { | |
3e1c9ff7 | 952 | goto ask_sessiond; |
93deb080 JI |
953 | } |
954 | ||
955 | /* | |
956 | * We have either a filter or some exclusions, so we need to set up | |
957 | * a variable-length memory block from where to send the data | |
958 | */ | |
959 | ||
960 | /* Parse filter expression */ | |
5cdb6027 | 961 | if (filter_expression != NULL || handle->domain.type == LTTNG_DOMAIN_JUL |
0e115563 DG |
962 | || handle->domain.type == LTTNG_DOMAIN_LOG4J |
963 | || handle->domain.type == LTTNG_DOMAIN_PYTHON) { | |
5cdb6027 | 964 | if (handle->domain.type == LTTNG_DOMAIN_JUL || |
0e115563 DG |
965 | handle->domain.type == LTTNG_DOMAIN_LOG4J || |
966 | handle->domain.type == LTTNG_DOMAIN_PYTHON) { | |
967 | char *agent_filter; | |
64226865 | 968 | |
347c5ab5 | 969 | /* Setup JUL filter if needed. */ |
0e115563 DG |
970 | agent_filter = set_agent_filter(filter_expression, ev); |
971 | if (!agent_filter) { | |
137b9942 DG |
972 | if (!filter_expression) { |
973 | /* No JUL and no filter, just skip everything below. */ | |
974 | goto ask_sessiond; | |
975 | } | |
64226865 DG |
976 | } else { |
977 | /* | |
0e115563 DG |
978 | * With an agent filter, the original filter has been added to |
979 | * it thus replace the filter expression. | |
64226865 | 980 | */ |
0e115563 | 981 | filter_expression = agent_filter; |
e9efbcd3 | 982 | free_filter_expression = 1; |
9b21e6d5 | 983 | } |
9b21e6d5 | 984 | } |
93deb080 | 985 | |
137b9942 | 986 | ret = generate_filter(filter_expression, &lsm, &ctx); |
93deb080 | 987 | if (ret) { |
137b9942 | 988 | goto filter_error; |
93deb080 | 989 | } |
6b453b5e JG |
990 | } |
991 | ||
992 | varlen_data = zmalloc(lsm.u.enable.bytecode_len | |
137b9942 DG |
993 | + lsm.u.enable.expression_len |
994 | + LTTNG_SYMBOL_NAME_LEN * exclusion_count); | |
6b453b5e JG |
995 | if (!varlen_data) { |
996 | ret = -LTTNG_ERR_EXCLUSION_NOMEM; | |
7ca1dc6f | 997 | goto mem_error; |
6b453b5e | 998 | } |
137b9942 | 999 | |
6b453b5e JG |
1000 | /* Put exclusion names first in the data */ |
1001 | while (exclusion_count--) { | |
1002 | strncpy(varlen_data + LTTNG_SYMBOL_NAME_LEN * exclusion_count, | |
137b9942 | 1003 | *(exclusion_list + exclusion_count), LTTNG_SYMBOL_NAME_LEN); |
6b453b5e JG |
1004 | } |
1005 | /* Add filter expression next */ | |
1006 | if (lsm.u.enable.expression_len != 0) { | |
1007 | memcpy(varlen_data | |
1008 | + LTTNG_SYMBOL_NAME_LEN * lsm.u.enable.exclusion_count, | |
1009 | filter_expression, | |
1010 | lsm.u.enable.expression_len); | |
1011 | } | |
1012 | /* Add filter bytecode next */ | |
137b9942 | 1013 | if (ctx && lsm.u.enable.bytecode_len != 0) { |
6b453b5e JG |
1014 | memcpy(varlen_data |
1015 | + LTTNG_SYMBOL_NAME_LEN * lsm.u.enable.exclusion_count | |
1016 | + lsm.u.enable.expression_len, | |
1017 | &ctx->bytecode->b, | |
1018 | lsm.u.enable.bytecode_len); | |
93deb080 JI |
1019 | } |
1020 | ||
1021 | ret = lttng_ctl_ask_sessiond_varlen(&lsm, varlen_data, | |
67676bd8 | 1022 | (LTTNG_SYMBOL_NAME_LEN * lsm.u.enable.exclusion_count) + |
137b9942 | 1023 | lsm.u.enable.bytecode_len + lsm.u.enable.expression_len, NULL); |
6b453b5e | 1024 | free(varlen_data); |
93deb080 | 1025 | |
7ca1dc6f DG |
1026 | mem_error: |
1027 | if (filter_expression && ctx) { | |
93deb080 JI |
1028 | filter_bytecode_free(ctx); |
1029 | filter_ir_free(ctx); | |
1030 | filter_parser_ctx_free(ctx); | |
7ca1dc6f DG |
1031 | } |
1032 | filter_error: | |
1033 | if (free_filter_expression) { | |
1034 | /* | |
1035 | * The filter expression has been replaced and must be freed as it is | |
1036 | * not the original filter expression received as a parameter. | |
1037 | */ | |
1038 | free(filter_expression); | |
93deb080 | 1039 | } |
137b9942 DG |
1040 | error: |
1041 | /* | |
1042 | * Return directly to the caller and don't ask the sessiond since something | |
1043 | * went wrong in the parsing of data above. | |
1044 | */ | |
93deb080 | 1045 | return ret; |
3e1c9ff7 DG |
1046 | |
1047 | ask_sessiond: | |
1048 | ret = lttng_ctl_ask_sessiond(&lsm, NULL); | |
1049 | return ret; | |
93deb080 JI |
1050 | } |
1051 | ||
6e911cad MD |
1052 | int lttng_disable_event_ext(struct lttng_handle *handle, |
1053 | struct lttng_event *ev, const char *channel_name, | |
1054 | const char *original_filter_expression) | |
1df4dedd | 1055 | { |
cd80958d | 1056 | struct lttcomm_session_msg lsm; |
6e911cad MD |
1057 | char *varlen_data; |
1058 | int ret = 0; | |
1059 | unsigned int free_filter_expression = 0; | |
1060 | struct filter_parser_ctx *ctx = NULL; | |
1061 | /* | |
1062 | * Cast as non-const since we may replace the filter expression | |
1063 | * by a dynamically allocated string. Otherwise, the original | |
1064 | * string is not modified. | |
1065 | */ | |
1066 | char *filter_expression = (char *) original_filter_expression; | |
1df4dedd | 1067 | |
6e911cad MD |
1068 | if (handle == NULL || ev == NULL) { |
1069 | ret = -LTTNG_ERR_INVALID; | |
1070 | goto error; | |
1071 | } | |
1072 | ||
1073 | /* Empty filter string will always be rejected by the parser | |
1074 | * anyway, so treat this corner-case early to eliminate | |
1075 | * lttng_fmemopen error for 0-byte allocation. | |
1076 | */ | |
1077 | if (filter_expression && filter_expression[0] == '\0') { | |
1078 | ret = -LTTNG_ERR_INVALID; | |
1079 | goto error; | |
cd80958d DG |
1080 | } |
1081 | ||
441c16a7 MD |
1082 | memset(&lsm, 0, sizeof(lsm)); |
1083 | ||
85076754 MD |
1084 | /* If no channel name, send empty string. */ |
1085 | if (channel_name == NULL) { | |
1086 | lttng_ctl_copy_string(lsm.u.disable.channel_name, "", | |
cd80958d | 1087 | sizeof(lsm.u.disable.channel_name)); |
f3ed775e | 1088 | } else { |
85076754 | 1089 | lttng_ctl_copy_string(lsm.u.disable.channel_name, channel_name, |
cd80958d | 1090 | sizeof(lsm.u.disable.channel_name)); |
eb354453 DG |
1091 | } |
1092 | ||
18a720cd MD |
1093 | lsm.cmd_type = LTTNG_DISABLE_EVENT; |
1094 | if (ev->name[0] == '\0') { | |
1095 | /* Disable all events */ | |
1096 | lttng_ctl_copy_string(ev->name, "*", sizeof(ev->name)); | |
f3ed775e DG |
1097 | } |
1098 | ||
6e911cad MD |
1099 | lttng_ctl_copy_lttng_domain(&lsm.domain, &handle->domain); |
1100 | /* FIXME: copying non-packed struct to packed struct. */ | |
1101 | memcpy(&lsm.u.disable.event, ev, sizeof(lsm.u.disable.event)); | |
1102 | ||
cac3069d | 1103 | lttng_ctl_copy_string(lsm.session.name, handle->session_name, |
cd80958d | 1104 | sizeof(lsm.session.name)); |
6e911cad | 1105 | lsm.u.disable.bytecode_len = 0; |
cd80958d | 1106 | |
6e911cad MD |
1107 | /* |
1108 | * For the JUL domain, a filter is enforced except for the | |
1109 | * disable all event. This is done to avoid having the event in | |
1110 | * all sessions thus filtering by logger name. | |
1111 | */ | |
1112 | if (filter_expression == NULL && | |
1113 | (handle->domain.type != LTTNG_DOMAIN_JUL && | |
0e115563 DG |
1114 | handle->domain.type != LTTNG_DOMAIN_LOG4J && |
1115 | handle->domain.type != LTTNG_DOMAIN_PYTHON)) { | |
6e911cad MD |
1116 | goto ask_sessiond; |
1117 | } | |
1118 | ||
1119 | /* | |
1120 | * We have a filter, so we need to set up a variable-length | |
1121 | * memory block from where to send the data. | |
1122 | */ | |
1123 | ||
1124 | /* Parse filter expression */ | |
1125 | if (filter_expression != NULL || handle->domain.type == LTTNG_DOMAIN_JUL | |
0e115563 DG |
1126 | || handle->domain.type == LTTNG_DOMAIN_LOG4J |
1127 | || handle->domain.type == LTTNG_DOMAIN_PYTHON) { | |
6e911cad | 1128 | if (handle->domain.type == LTTNG_DOMAIN_JUL || |
0e115563 DG |
1129 | handle->domain.type == LTTNG_DOMAIN_LOG4J || |
1130 | handle->domain.type == LTTNG_DOMAIN_PYTHON) { | |
1131 | char *agent_filter; | |
6e911cad MD |
1132 | |
1133 | /* Setup JUL filter if needed. */ | |
0e115563 DG |
1134 | agent_filter = set_agent_filter(filter_expression, ev); |
1135 | if (!agent_filter) { | |
6e911cad MD |
1136 | if (!filter_expression) { |
1137 | /* No JUL and no filter, just skip everything below. */ | |
1138 | goto ask_sessiond; | |
1139 | } | |
1140 | } else { | |
1141 | /* | |
1142 | * With a JUL filter, the original filter has been added to it | |
1143 | * thus replace the filter expression. | |
1144 | */ | |
0e115563 | 1145 | filter_expression = agent_filter; |
6e911cad MD |
1146 | free_filter_expression = 1; |
1147 | } | |
1148 | } | |
1149 | ||
1150 | ret = generate_filter(filter_expression, &lsm, &ctx); | |
1151 | if (ret) { | |
1152 | goto filter_error; | |
1153 | } | |
1154 | } | |
1155 | ||
1156 | varlen_data = zmalloc(lsm.u.disable.bytecode_len | |
1157 | + lsm.u.disable.expression_len); | |
1158 | if (!varlen_data) { | |
1159 | ret = -LTTNG_ERR_EXCLUSION_NOMEM; | |
1160 | goto mem_error; | |
1161 | } | |
1162 | ||
1163 | /* Add filter expression */ | |
1164 | if (lsm.u.disable.expression_len != 0) { | |
1165 | memcpy(varlen_data, | |
1166 | filter_expression, | |
1167 | lsm.u.disable.expression_len); | |
1168 | } | |
1169 | /* Add filter bytecode next */ | |
1170 | if (ctx && lsm.u.disable.bytecode_len != 0) { | |
1171 | memcpy(varlen_data | |
1172 | + lsm.u.disable.expression_len, | |
1173 | &ctx->bytecode->b, | |
1174 | lsm.u.disable.bytecode_len); | |
1175 | } | |
1176 | ||
1177 | ret = lttng_ctl_ask_sessiond_varlen(&lsm, varlen_data, | |
1178 | lsm.u.disable.bytecode_len + lsm.u.disable.expression_len, NULL); | |
1179 | free(varlen_data); | |
1180 | ||
1181 | mem_error: | |
1182 | if (filter_expression && ctx) { | |
1183 | filter_bytecode_free(ctx); | |
1184 | filter_ir_free(ctx); | |
1185 | filter_parser_ctx_free(ctx); | |
1186 | } | |
1187 | filter_error: | |
1188 | if (free_filter_expression) { | |
1189 | /* | |
1190 | * The filter expression has been replaced and must be freed as it is | |
1191 | * not the original filter expression received as a parameter. | |
1192 | */ | |
1193 | free(filter_expression); | |
1194 | } | |
1195 | error: | |
1196 | /* | |
1197 | * Return directly to the caller and don't ask the sessiond since something | |
1198 | * went wrong in the parsing of data above. | |
1199 | */ | |
1200 | return ret; | |
1201 | ||
1202 | ask_sessiond: | |
1203 | ret = lttng_ctl_ask_sessiond(&lsm, NULL); | |
1204 | return ret; | |
1205 | } | |
1206 | ||
1207 | /* | |
1208 | * Disable event(s) of a channel and domain. | |
1209 | * If no event name is specified, all events are disabled. | |
1210 | * If no channel name is specified, the default 'channel0' is used. | |
1211 | * Returns size of returned session payload data or a negative error code. | |
1212 | */ | |
1213 | int lttng_disable_event(struct lttng_handle *handle, const char *name, | |
1214 | const char *channel_name) | |
1215 | { | |
1216 | struct lttng_event ev; | |
1217 | ||
1218 | memset(&ev, 0, sizeof(ev)); | |
9b7431cf | 1219 | ev.loglevel = -1; |
6e911cad MD |
1220 | ev.type = LTTNG_EVENT_ALL; |
1221 | lttng_ctl_copy_string(ev.name, name, sizeof(ev.name)); | |
1222 | return lttng_disable_event_ext(handle, &ev, channel_name, NULL); | |
1df4dedd DG |
1223 | } |
1224 | ||
1225 | /* | |
1c8d13c8 TD |
1226 | * Enable channel per domain |
1227 | * Returns size of returned session payload data or a negative error code. | |
a5c5a2bd | 1228 | */ |
cd80958d | 1229 | int lttng_enable_channel(struct lttng_handle *handle, |
38057ed1 | 1230 | struct lttng_channel *chan) |
a5c5a2bd | 1231 | { |
cd80958d DG |
1232 | struct lttcomm_session_msg lsm; |
1233 | ||
5117eeec DG |
1234 | /* |
1235 | * NULL arguments are forbidden. No default values. | |
1236 | */ | |
1237 | if (handle == NULL || chan == NULL) { | |
2f70b271 | 1238 | return -LTTNG_ERR_INVALID; |
cd80958d DG |
1239 | } |
1240 | ||
441c16a7 MD |
1241 | memset(&lsm, 0, sizeof(lsm)); |
1242 | ||
5117eeec | 1243 | memcpy(&lsm.u.channel.chan, chan, sizeof(lsm.u.channel.chan)); |
7d29a247 | 1244 | |
cd80958d DG |
1245 | lsm.cmd_type = LTTNG_ENABLE_CHANNEL; |
1246 | ||
cac3069d | 1247 | lttng_ctl_copy_lttng_domain(&lsm.domain, &handle->domain); |
7d29a247 | 1248 | |
cac3069d | 1249 | lttng_ctl_copy_string(lsm.session.name, handle->session_name, |
cd80958d DG |
1250 | sizeof(lsm.session.name)); |
1251 | ||
cac3069d | 1252 | return lttng_ctl_ask_sessiond(&lsm, NULL); |
8c0faa1d | 1253 | } |
1df4dedd | 1254 | |
2ef84c95 | 1255 | /* |
1c8d13c8 TD |
1256 | * All tracing will be stopped for registered events of the channel. |
1257 | * Returns size of returned session payload data or a negative error code. | |
2ef84c95 | 1258 | */ |
cd80958d | 1259 | int lttng_disable_channel(struct lttng_handle *handle, const char *name) |
2ef84c95 | 1260 | { |
cd80958d DG |
1261 | struct lttcomm_session_msg lsm; |
1262 | ||
9d697d3d DG |
1263 | /* Safety check. Both are mandatory */ |
1264 | if (handle == NULL || name == NULL) { | |
2f70b271 | 1265 | return -LTTNG_ERR_INVALID; |
cd80958d DG |
1266 | } |
1267 | ||
441c16a7 MD |
1268 | memset(&lsm, 0, sizeof(lsm)); |
1269 | ||
cd80958d | 1270 | lsm.cmd_type = LTTNG_DISABLE_CHANNEL; |
1df4dedd | 1271 | |
cac3069d | 1272 | lttng_ctl_copy_string(lsm.u.disable.channel_name, name, |
9d697d3d DG |
1273 | sizeof(lsm.u.disable.channel_name)); |
1274 | ||
cac3069d | 1275 | lttng_ctl_copy_lttng_domain(&lsm.domain, &handle->domain); |
cd80958d | 1276 | |
cac3069d | 1277 | lttng_ctl_copy_string(lsm.session.name, handle->session_name, |
cd80958d DG |
1278 | sizeof(lsm.session.name)); |
1279 | ||
cac3069d | 1280 | return lttng_ctl_ask_sessiond(&lsm, NULL); |
ca95a216 DG |
1281 | } |
1282 | ||
ccf10263 MD |
1283 | /* |
1284 | * Add PID to session tracker. | |
1285 | * Return 0 on success else a negative LTTng error code. | |
1286 | */ | |
1287 | int lttng_track_pid(struct lttng_handle *handle, int pid) | |
1288 | { | |
1289 | struct lttcomm_session_msg lsm; | |
1290 | ||
1291 | /* | |
1292 | * NULL arguments are forbidden. No default values. | |
1293 | */ | |
1294 | if (handle == NULL) { | |
1295 | return -LTTNG_ERR_INVALID; | |
1296 | } | |
1297 | ||
1298 | memset(&lsm, 0, sizeof(lsm)); | |
1299 | ||
1300 | lsm.cmd_type = LTTNG_TRACK_PID; | |
1301 | lsm.u.pid_tracker.pid = pid; | |
1302 | ||
1303 | lttng_ctl_copy_lttng_domain(&lsm.domain, &handle->domain); | |
1304 | ||
1305 | lttng_ctl_copy_string(lsm.session.name, handle->session_name, | |
1306 | sizeof(lsm.session.name)); | |
1307 | ||
1308 | return lttng_ctl_ask_sessiond(&lsm, NULL); | |
1309 | } | |
1310 | ||
1311 | /* | |
1312 | * Remove PID from session tracker. | |
1313 | * Return 0 on success else a negative LTTng error code. | |
1314 | */ | |
1315 | int lttng_untrack_pid(struct lttng_handle *handle, int pid) | |
1316 | { | |
1317 | struct lttcomm_session_msg lsm; | |
1318 | ||
1319 | /* | |
1320 | * NULL arguments are forbidden. No default values. | |
1321 | */ | |
1322 | if (handle == NULL) { | |
1323 | return -LTTNG_ERR_INVALID; | |
1324 | } | |
1325 | ||
1326 | memset(&lsm, 0, sizeof(lsm)); | |
1327 | ||
1328 | lsm.cmd_type = LTTNG_UNTRACK_PID; | |
1329 | lsm.u.pid_tracker.pid = pid; | |
1330 | ||
1331 | lttng_ctl_copy_lttng_domain(&lsm.domain, &handle->domain); | |
1332 | ||
1333 | lttng_ctl_copy_string(lsm.session.name, handle->session_name, | |
1334 | sizeof(lsm.session.name)); | |
1335 | ||
1336 | return lttng_ctl_ask_sessiond(&lsm, NULL); | |
1337 | } | |
1338 | ||
fac6795d | 1339 | /* |
1c8d13c8 TD |
1340 | * Lists all available tracepoints of domain. |
1341 | * Sets the contents of the events array. | |
1342 | * Returns the number of lttng_event entries in events; | |
1343 | * on error, returns a negative value. | |
fac6795d | 1344 | */ |
cd80958d | 1345 | int lttng_list_tracepoints(struct lttng_handle *handle, |
2a71efd5 | 1346 | struct lttng_event **events) |
fac6795d | 1347 | { |
052da939 | 1348 | int ret; |
cd80958d DG |
1349 | struct lttcomm_session_msg lsm; |
1350 | ||
9d697d3d | 1351 | if (handle == NULL) { |
2f70b271 | 1352 | return -LTTNG_ERR_INVALID; |
cd80958d | 1353 | } |
fac6795d | 1354 | |
53efb85a | 1355 | memset(&lsm, 0, sizeof(lsm)); |
cd80958d | 1356 | lsm.cmd_type = LTTNG_LIST_TRACEPOINTS; |
cac3069d | 1357 | lttng_ctl_copy_lttng_domain(&lsm.domain, &handle->domain); |
2a71efd5 | 1358 | |
cac3069d | 1359 | ret = lttng_ctl_ask_sessiond(&lsm, (void **) events); |
052da939 DG |
1360 | if (ret < 0) { |
1361 | return ret; | |
eb354453 | 1362 | } |
fac6795d | 1363 | |
9f19cc17 | 1364 | return ret / sizeof(struct lttng_event); |
fac6795d DG |
1365 | } |
1366 | ||
f37d259d MD |
1367 | /* |
1368 | * Lists all available tracepoint fields of domain. | |
1369 | * Sets the contents of the event field array. | |
1370 | * Returns the number of lttng_event_field entries in events; | |
1371 | * on error, returns a negative value. | |
1372 | */ | |
1373 | int lttng_list_tracepoint_fields(struct lttng_handle *handle, | |
1374 | struct lttng_event_field **fields) | |
1375 | { | |
1376 | int ret; | |
1377 | struct lttcomm_session_msg lsm; | |
1378 | ||
1379 | if (handle == NULL) { | |
2f70b271 | 1380 | return -LTTNG_ERR_INVALID; |
f37d259d MD |
1381 | } |
1382 | ||
53efb85a | 1383 | memset(&lsm, 0, sizeof(lsm)); |
f37d259d | 1384 | lsm.cmd_type = LTTNG_LIST_TRACEPOINT_FIELDS; |
cac3069d | 1385 | lttng_ctl_copy_lttng_domain(&lsm.domain, &handle->domain); |
f37d259d | 1386 | |
cac3069d | 1387 | ret = lttng_ctl_ask_sessiond(&lsm, (void **) fields); |
f37d259d MD |
1388 | if (ret < 0) { |
1389 | return ret; | |
1390 | } | |
1391 | ||
1392 | return ret / sizeof(struct lttng_event_field); | |
1393 | } | |
1394 | ||
834978fd DG |
1395 | /* |
1396 | * Lists all available kernel system calls. Allocates and sets the contents of | |
1397 | * the events array. | |
1398 | * | |
1399 | * Returns the number of lttng_event entries in events; on error, returns a | |
1400 | * negative value. | |
1401 | */ | |
1402 | int lttng_list_syscalls(struct lttng_event **events) | |
1403 | { | |
1404 | int ret; | |
1405 | struct lttcomm_session_msg lsm; | |
1406 | ||
1407 | if (!events) { | |
1408 | return -LTTNG_ERR_INVALID; | |
1409 | } | |
1410 | ||
1411 | memset(&lsm, 0, sizeof(lsm)); | |
1412 | lsm.cmd_type = LTTNG_LIST_SYSCALLS; | |
1413 | /* Force kernel domain for system calls. */ | |
1414 | lsm.domain.type = LTTNG_DOMAIN_KERNEL; | |
1415 | ||
1416 | ret = lttng_ctl_ask_sessiond(&lsm, (void **) events); | |
1417 | if (ret < 0) { | |
1418 | return ret; | |
1419 | } | |
1420 | ||
1421 | return ret / sizeof(struct lttng_event); | |
1422 | } | |
1423 | ||
1657e9bb | 1424 | /* |
1c8d13c8 TD |
1425 | * Returns a human readable string describing |
1426 | * the error code (a negative value). | |
1657e9bb | 1427 | */ |
9a745bc7 | 1428 | const char *lttng_strerror(int code) |
1657e9bb | 1429 | { |
f73fabfd | 1430 | return error_get_str(code); |
1657e9bb DG |
1431 | } |
1432 | ||
aaf97519 | 1433 | /* |
a4b92340 DG |
1434 | * Create a brand new session using name and url for destination. |
1435 | * | |
f73fabfd | 1436 | * Returns LTTNG_OK on success or a negative error code. |
00e2e675 | 1437 | */ |
a4b92340 | 1438 | int lttng_create_session(const char *name, const char *url) |
00e2e675 | 1439 | { |
3dd05a85 | 1440 | int ret; |
a4b92340 | 1441 | ssize_t size; |
00e2e675 | 1442 | struct lttcomm_session_msg lsm; |
a4b92340 | 1443 | struct lttng_uri *uris = NULL; |
00e2e675 | 1444 | |
a4b92340 | 1445 | if (name == NULL) { |
2f70b271 | 1446 | return -LTTNG_ERR_INVALID; |
00e2e675 DG |
1447 | } |
1448 | ||
a4b92340 | 1449 | memset(&lsm, 0, sizeof(lsm)); |
00e2e675 | 1450 | |
a4b92340 | 1451 | lsm.cmd_type = LTTNG_CREATE_SESSION; |
cac3069d | 1452 | lttng_ctl_copy_string(lsm.session.name, name, sizeof(lsm.session.name)); |
a4b92340 DG |
1453 | |
1454 | /* There should never be a data URL */ | |
bc894455 | 1455 | size = uri_parse_str_urls(url, NULL, &uris); |
a4b92340 | 1456 | if (size < 0) { |
2f70b271 | 1457 | return -LTTNG_ERR_INVALID; |
00e2e675 DG |
1458 | } |
1459 | ||
a4b92340 DG |
1460 | lsm.u.uri.size = size; |
1461 | ||
cac3069d DG |
1462 | ret = lttng_ctl_ask_sessiond_varlen(&lsm, uris, |
1463 | sizeof(struct lttng_uri) * size, NULL); | |
3dd05a85 DG |
1464 | |
1465 | free(uris); | |
1466 | return ret; | |
00e2e675 DG |
1467 | } |
1468 | ||
8028d920 | 1469 | /* |
8028d920 | 1470 | * Destroy session using name. |
1c8d13c8 | 1471 | * Returns size of returned session payload data or a negative error code. |
8028d920 | 1472 | */ |
843f5df9 | 1473 | int lttng_destroy_session(const char *session_name) |
8028d920 | 1474 | { |
cd80958d DG |
1475 | struct lttcomm_session_msg lsm; |
1476 | ||
843f5df9 | 1477 | if (session_name == NULL) { |
2f70b271 | 1478 | return -LTTNG_ERR_INVALID; |
cd80958d DG |
1479 | } |
1480 | ||
53efb85a | 1481 | memset(&lsm, 0, sizeof(lsm)); |
cd80958d | 1482 | lsm.cmd_type = LTTNG_DESTROY_SESSION; |
843f5df9 | 1483 | |
cac3069d DG |
1484 | lttng_ctl_copy_string(lsm.session.name, session_name, |
1485 | sizeof(lsm.session.name)); | |
cd80958d | 1486 | |
cac3069d | 1487 | return lttng_ctl_ask_sessiond(&lsm, NULL); |
aaf97519 DG |
1488 | } |
1489 | ||
57167058 | 1490 | /* |
57167058 | 1491 | * Ask the session daemon for all available sessions. |
1c8d13c8 TD |
1492 | * Sets the contents of the sessions array. |
1493 | * Returns the number of lttng_session entries in sessions; | |
1494 | * on error, returns a negative value. | |
57167058 | 1495 | */ |
ca95a216 | 1496 | int lttng_list_sessions(struct lttng_session **sessions) |
57167058 | 1497 | { |
ca95a216 | 1498 | int ret; |
cd80958d | 1499 | struct lttcomm_session_msg lsm; |
57167058 | 1500 | |
53efb85a | 1501 | memset(&lsm, 0, sizeof(lsm)); |
cd80958d | 1502 | lsm.cmd_type = LTTNG_LIST_SESSIONS; |
cac3069d | 1503 | ret = lttng_ctl_ask_sessiond(&lsm, (void**) sessions); |
57167058 | 1504 | if (ret < 0) { |
ca95a216 | 1505 | return ret; |
57167058 DG |
1506 | } |
1507 | ||
ca95a216 | 1508 | return ret / sizeof(struct lttng_session); |
57167058 DG |
1509 | } |
1510 | ||
d7ba1388 MD |
1511 | int lttng_set_session_shm_path(const char *session_name, |
1512 | const char *shm_path) | |
1513 | { | |
1514 | struct lttcomm_session_msg lsm; | |
1515 | ||
1516 | if (session_name == NULL) { | |
1517 | return -LTTNG_ERR_INVALID; | |
1518 | } | |
1519 | ||
1520 | memset(&lsm, 0, sizeof(lsm)); | |
1521 | lsm.cmd_type = LTTNG_SET_SESSION_SHM_PATH; | |
1522 | ||
1523 | lttng_ctl_copy_string(lsm.session.name, session_name, | |
1524 | sizeof(lsm.session.name)); | |
1525 | lttng_ctl_copy_string(lsm.u.set_shm_path.shm_path, shm_path, | |
1526 | sizeof(lsm.u.set_shm_path.shm_path)); | |
1527 | ||
1528 | return lttng_ctl_ask_sessiond(&lsm, NULL); | |
1529 | } | |
1530 | ||
9f19cc17 | 1531 | /* |
1c8d13c8 TD |
1532 | * Ask the session daemon for all available domains of a session. |
1533 | * Sets the contents of the domains array. | |
1534 | * Returns the number of lttng_domain entries in domains; | |
1535 | * on error, returns a negative value. | |
9f19cc17 | 1536 | */ |
330be774 | 1537 | int lttng_list_domains(const char *session_name, |
cd80958d | 1538 | struct lttng_domain **domains) |
9f19cc17 DG |
1539 | { |
1540 | int ret; | |
cd80958d DG |
1541 | struct lttcomm_session_msg lsm; |
1542 | ||
330be774 | 1543 | if (session_name == NULL) { |
2f70b271 | 1544 | return -LTTNG_ERR_INVALID; |
cd80958d | 1545 | } |
9f19cc17 | 1546 | |
53efb85a | 1547 | memset(&lsm, 0, sizeof(lsm)); |
cd80958d DG |
1548 | lsm.cmd_type = LTTNG_LIST_DOMAINS; |
1549 | ||
cac3069d DG |
1550 | lttng_ctl_copy_string(lsm.session.name, session_name, |
1551 | sizeof(lsm.session.name)); | |
cd80958d | 1552 | |
cac3069d | 1553 | ret = lttng_ctl_ask_sessiond(&lsm, (void**) domains); |
9f19cc17 DG |
1554 | if (ret < 0) { |
1555 | return ret; | |
1556 | } | |
1557 | ||
1558 | return ret / sizeof(struct lttng_domain); | |
1559 | } | |
1560 | ||
1561 | /* | |
1c8d13c8 TD |
1562 | * Ask the session daemon for all available channels of a session. |
1563 | * Sets the contents of the channels array. | |
1564 | * Returns the number of lttng_channel entries in channels; | |
1565 | * on error, returns a negative value. | |
9f19cc17 | 1566 | */ |
cd80958d DG |
1567 | int lttng_list_channels(struct lttng_handle *handle, |
1568 | struct lttng_channel **channels) | |
9f19cc17 DG |
1569 | { |
1570 | int ret; | |
cd80958d DG |
1571 | struct lttcomm_session_msg lsm; |
1572 | ||
9d697d3d | 1573 | if (handle == NULL) { |
2f70b271 | 1574 | return -LTTNG_ERR_INVALID; |
cd80958d DG |
1575 | } |
1576 | ||
53efb85a | 1577 | memset(&lsm, 0, sizeof(lsm)); |
cd80958d | 1578 | lsm.cmd_type = LTTNG_LIST_CHANNELS; |
cac3069d | 1579 | lttng_ctl_copy_string(lsm.session.name, handle->session_name, |
cd80958d | 1580 | sizeof(lsm.session.name)); |
9f19cc17 | 1581 | |
cac3069d | 1582 | lttng_ctl_copy_lttng_domain(&lsm.domain, &handle->domain); |
9f19cc17 | 1583 | |
cac3069d | 1584 | ret = lttng_ctl_ask_sessiond(&lsm, (void**) channels); |
9f19cc17 DG |
1585 | if (ret < 0) { |
1586 | return ret; | |
1587 | } | |
1588 | ||
1589 | return ret / sizeof(struct lttng_channel); | |
1590 | } | |
1591 | ||
1592 | /* | |
1c8d13c8 TD |
1593 | * Ask the session daemon for all available events of a session channel. |
1594 | * Sets the contents of the events array. | |
1595 | * Returns the number of lttng_event entries in events; | |
1596 | * on error, returns a negative value. | |
9f19cc17 | 1597 | */ |
cd80958d DG |
1598 | int lttng_list_events(struct lttng_handle *handle, |
1599 | const char *channel_name, struct lttng_event **events) | |
9f19cc17 DG |
1600 | { |
1601 | int ret; | |
cd80958d | 1602 | struct lttcomm_session_msg lsm; |
9f19cc17 | 1603 | |
9d697d3d DG |
1604 | /* Safety check. An handle and channel name are mandatory */ |
1605 | if (handle == NULL || channel_name == NULL) { | |
2f70b271 | 1606 | return -LTTNG_ERR_INVALID; |
cd80958d DG |
1607 | } |
1608 | ||
53efb85a | 1609 | memset(&lsm, 0, sizeof(lsm)); |
cd80958d | 1610 | lsm.cmd_type = LTTNG_LIST_EVENTS; |
cac3069d | 1611 | lttng_ctl_copy_string(lsm.session.name, handle->session_name, |
cd80958d | 1612 | sizeof(lsm.session.name)); |
cac3069d | 1613 | lttng_ctl_copy_string(lsm.u.list.channel_name, channel_name, |
cd80958d DG |
1614 | sizeof(lsm.u.list.channel_name)); |
1615 | ||
cac3069d | 1616 | lttng_ctl_copy_lttng_domain(&lsm.domain, &handle->domain); |
9f19cc17 | 1617 | |
cac3069d | 1618 | ret = lttng_ctl_ask_sessiond(&lsm, (void**) events); |
9f19cc17 DG |
1619 | if (ret < 0) { |
1620 | return ret; | |
1621 | } | |
1622 | ||
1623 | return ret / sizeof(struct lttng_event); | |
1624 | } | |
1625 | ||
fac6795d | 1626 | /* |
1c8d13c8 TD |
1627 | * Sets the tracing_group variable with name. |
1628 | * This function allocates memory pointed to by tracing_group. | |
1629 | * On success, returns 0, on error, returns -1 (null name) or -ENOMEM. | |
fac6795d DG |
1630 | */ |
1631 | int lttng_set_tracing_group(const char *name) | |
1632 | { | |
9d697d3d | 1633 | if (name == NULL) { |
2f70b271 | 1634 | return -LTTNG_ERR_INVALID; |
9d697d3d DG |
1635 | } |
1636 | ||
fac6795d | 1637 | if (asprintf(&tracing_group, "%s", name) < 0) { |
2f70b271 | 1638 | return -LTTNG_ERR_FATAL; |
fac6795d DG |
1639 | } |
1640 | ||
1641 | return 0; | |
1642 | } | |
1643 | ||
d0254c7c | 1644 | /* |
af87c45a | 1645 | * Returns size of returned session payload data or a negative error code. |
d0254c7c | 1646 | */ |
cd80958d | 1647 | int lttng_calibrate(struct lttng_handle *handle, |
d0254c7c MD |
1648 | struct lttng_calibrate *calibrate) |
1649 | { | |
cd80958d | 1650 | struct lttcomm_session_msg lsm; |
d0254c7c | 1651 | |
9d697d3d DG |
1652 | /* Safety check. NULL pointer are forbidden */ |
1653 | if (handle == NULL || calibrate == NULL) { | |
2f70b271 | 1654 | return -LTTNG_ERR_INVALID; |
cd80958d | 1655 | } |
d0254c7c | 1656 | |
53efb85a | 1657 | memset(&lsm, 0, sizeof(lsm)); |
cd80958d | 1658 | lsm.cmd_type = LTTNG_CALIBRATE; |
cac3069d | 1659 | lttng_ctl_copy_lttng_domain(&lsm.domain, &handle->domain); |
d0254c7c | 1660 | |
cd80958d DG |
1661 | memcpy(&lsm.u.calibrate, calibrate, sizeof(lsm.u.calibrate)); |
1662 | ||
cac3069d | 1663 | return lttng_ctl_ask_sessiond(&lsm, NULL); |
d0254c7c MD |
1664 | } |
1665 | ||
5edd7e09 DG |
1666 | /* |
1667 | * Set default channel attributes. | |
441c16a7 | 1668 | * If either or both of the arguments are null, attr content is zeroe'd. |
5edd7e09 DG |
1669 | */ |
1670 | void lttng_channel_set_default_attr(struct lttng_domain *domain, | |
1671 | struct lttng_channel_attr *attr) | |
1672 | { | |
1673 | /* Safety check */ | |
1674 | if (attr == NULL || domain == NULL) { | |
1675 | return; | |
1676 | } | |
1677 | ||
eacaa7a6 DS |
1678 | memset(attr, 0, sizeof(struct lttng_channel_attr)); |
1679 | ||
0a9c6494 DG |
1680 | /* Same for all domains. */ |
1681 | attr->overwrite = DEFAULT_CHANNEL_OVERWRITE; | |
1682 | attr->tracefile_size = DEFAULT_CHANNEL_TRACEFILE_SIZE; | |
1683 | attr->tracefile_count = DEFAULT_CHANNEL_TRACEFILE_COUNT; | |
1684 | ||
5edd7e09 DG |
1685 | switch (domain->type) { |
1686 | case LTTNG_DOMAIN_KERNEL: | |
d92ff3ef DG |
1687 | attr->switch_timer_interval = DEFAULT_KERNEL_CHANNEL_SWITCH_TIMER; |
1688 | attr->read_timer_interval = DEFAULT_KERNEL_CHANNEL_READ_TIMER; | |
3e230f92 | 1689 | attr->subbuf_size = default_get_kernel_channel_subbuf_size(); |
5edd7e09 DG |
1690 | attr->num_subbuf = DEFAULT_KERNEL_CHANNEL_SUBBUF_NUM; |
1691 | attr->output = DEFAULT_KERNEL_CHANNEL_OUTPUT; | |
1692 | break; | |
1693 | case LTTNG_DOMAIN_UST: | |
0a9c6494 DG |
1694 | switch (domain->buf_type) { |
1695 | case LTTNG_BUFFER_PER_UID: | |
1696 | attr->subbuf_size = default_get_ust_uid_channel_subbuf_size(); | |
1697 | attr->num_subbuf = DEFAULT_UST_UID_CHANNEL_SUBBUF_NUM; | |
1698 | attr->output = DEFAULT_UST_UID_CHANNEL_OUTPUT; | |
1699 | attr->switch_timer_interval = DEFAULT_UST_UID_CHANNEL_SWITCH_TIMER; | |
1700 | attr->read_timer_interval = DEFAULT_UST_UID_CHANNEL_READ_TIMER; | |
1701 | break; | |
1702 | case LTTNG_BUFFER_PER_PID: | |
1703 | default: | |
1704 | attr->subbuf_size = default_get_ust_pid_channel_subbuf_size(); | |
1705 | attr->num_subbuf = DEFAULT_UST_PID_CHANNEL_SUBBUF_NUM; | |
1706 | attr->output = DEFAULT_UST_PID_CHANNEL_OUTPUT; | |
1707 | attr->switch_timer_interval = DEFAULT_UST_PID_CHANNEL_SWITCH_TIMER; | |
1708 | attr->read_timer_interval = DEFAULT_UST_PID_CHANNEL_READ_TIMER; | |
1709 | break; | |
1710 | } | |
5edd7e09 | 1711 | default: |
441c16a7 | 1712 | /* Default behavior: leave set to 0. */ |
5edd7e09 DG |
1713 | break; |
1714 | } | |
1715 | } | |
1716 | ||
fac6795d | 1717 | /* |
2269e89e | 1718 | * Check if session daemon is alive. |
fac6795d | 1719 | * |
2269e89e | 1720 | * Return 1 if alive or 0 if not. |
1c8d13c8 | 1721 | * On error returns a negative value. |
fac6795d | 1722 | */ |
947308c4 | 1723 | int lttng_session_daemon_alive(void) |
fac6795d DG |
1724 | { |
1725 | int ret; | |
1726 | ||
1727 | ret = set_session_daemon_path(); | |
1728 | if (ret < 0) { | |
947308c4 | 1729 | /* Error */ |
fac6795d DG |
1730 | return ret; |
1731 | } | |
1732 | ||
9d035200 | 1733 | if (*sessiond_sock_path == '\0') { |
2f70b271 DG |
1734 | /* |
1735 | * No socket path set. Weird error which means the constructor was not | |
1736 | * called. | |
1737 | */ | |
1738 | assert(0); | |
fac6795d DG |
1739 | } |
1740 | ||
2269e89e | 1741 | ret = try_connect_sessiond(sessiond_sock_path); |
7d8234d9 MD |
1742 | if (ret < 0) { |
1743 | /* Not alive */ | |
1744 | return 0; | |
1745 | } | |
7d8234d9 | 1746 | |
947308c4 DG |
1747 | /* Is alive */ |
1748 | return 1; | |
fac6795d DG |
1749 | } |
1750 | ||
00e2e675 | 1751 | /* |
a4b92340 | 1752 | * Set URL for a consumer for a session and domain. |
00e2e675 DG |
1753 | * |
1754 | * Return 0 on success, else a negative value. | |
1755 | */ | |
a4b92340 DG |
1756 | int lttng_set_consumer_url(struct lttng_handle *handle, |
1757 | const char *control_url, const char *data_url) | |
00e2e675 | 1758 | { |
3dd05a85 | 1759 | int ret; |
a4b92340 | 1760 | ssize_t size; |
00e2e675 | 1761 | struct lttcomm_session_msg lsm; |
a4b92340 | 1762 | struct lttng_uri *uris = NULL; |
00e2e675 | 1763 | |
a4b92340 | 1764 | if (handle == NULL || (control_url == NULL && data_url == NULL)) { |
2f70b271 | 1765 | return -LTTNG_ERR_INVALID; |
00e2e675 DG |
1766 | } |
1767 | ||
a4b92340 DG |
1768 | memset(&lsm, 0, sizeof(lsm)); |
1769 | ||
00e2e675 DG |
1770 | lsm.cmd_type = LTTNG_SET_CONSUMER_URI; |
1771 | ||
cac3069d | 1772 | lttng_ctl_copy_string(lsm.session.name, handle->session_name, |
00e2e675 | 1773 | sizeof(lsm.session.name)); |
cac3069d | 1774 | lttng_ctl_copy_lttng_domain(&lsm.domain, &handle->domain); |
00e2e675 | 1775 | |
bc894455 | 1776 | size = uri_parse_str_urls(control_url, data_url, &uris); |
a4b92340 | 1777 | if (size < 0) { |
2f70b271 | 1778 | return -LTTNG_ERR_INVALID; |
a4b92340 DG |
1779 | } |
1780 | ||
1781 | lsm.u.uri.size = size; | |
00e2e675 | 1782 | |
cac3069d DG |
1783 | ret = lttng_ctl_ask_sessiond_varlen(&lsm, uris, |
1784 | sizeof(struct lttng_uri) * size, NULL); | |
3dd05a85 DG |
1785 | |
1786 | free(uris); | |
1787 | return ret; | |
00e2e675 DG |
1788 | } |
1789 | ||
1790 | /* | |
9c6bda17 | 1791 | * [OBSOLETE] |
00e2e675 DG |
1792 | */ |
1793 | int lttng_enable_consumer(struct lttng_handle *handle) | |
1794 | { | |
785d2d0d | 1795 | return -ENOSYS; |
00e2e675 DG |
1796 | } |
1797 | ||
1798 | /* | |
9c6bda17 | 1799 | * [OBSOLETE] |
00e2e675 DG |
1800 | */ |
1801 | int lttng_disable_consumer(struct lttng_handle *handle) | |
1802 | { | |
785d2d0d | 1803 | return -ENOSYS; |
00e2e675 DG |
1804 | } |
1805 | ||
07424f16 DG |
1806 | /* |
1807 | * This is an extension of create session that is ONLY and SHOULD only be used | |
1808 | * by the lttng command line program. It exists to avoid using URI parsing in | |
1809 | * the lttng client. | |
1810 | * | |
1811 | * We need the date and time for the trace path subdirectory for the case where | |
1812 | * the user does NOT define one using either -o or -U. Using the normal | |
1813 | * lttng_create_session API call, we have no clue on the session daemon side if | |
1814 | * the URL was generated automatically by the client or define by the user. | |
1815 | * | |
1816 | * So this function "wrapper" is hidden from the public API, takes the datetime | |
1817 | * string and appends it if necessary to the URI subdirectory before sending it | |
1818 | * to the session daemon. | |
1819 | * | |
1820 | * With this extra function, the lttng_create_session call behavior is not | |
1821 | * changed and the timestamp is appended to the URI on the session daemon side | |
1822 | * if necessary. | |
1823 | */ | |
1824 | int _lttng_create_session_ext(const char *name, const char *url, | |
1825 | const char *datetime) | |
1826 | { | |
3dd05a85 | 1827 | int ret; |
07424f16 DG |
1828 | ssize_t size; |
1829 | struct lttcomm_session_msg lsm; | |
1830 | struct lttng_uri *uris = NULL; | |
1831 | ||
2bba9e53 | 1832 | if (name == NULL || datetime == NULL) { |
2f70b271 | 1833 | return -LTTNG_ERR_INVALID; |
07424f16 DG |
1834 | } |
1835 | ||
1836 | memset(&lsm, 0, sizeof(lsm)); | |
1837 | ||
1838 | lsm.cmd_type = LTTNG_CREATE_SESSION; | |
cac3069d | 1839 | lttng_ctl_copy_string(lsm.session.name, name, sizeof(lsm.session.name)); |
07424f16 DG |
1840 | |
1841 | /* There should never be a data URL */ | |
bc894455 | 1842 | size = uri_parse_str_urls(url, NULL, &uris); |
07424f16 | 1843 | if (size < 0) { |
3dd05a85 DG |
1844 | ret = -LTTNG_ERR_INVALID; |
1845 | goto error; | |
07424f16 DG |
1846 | } |
1847 | ||
1848 | lsm.u.uri.size = size; | |
1849 | ||
4b35a6b3 | 1850 | if (size > 0 && uris[0].dtype != LTTNG_DST_PATH && strlen(uris[0].subdir) == 0) { |
da4aa2b8 DG |
1851 | /* Don't append datetime if the name was automatically created. */ |
1852 | if (strncmp(name, DEFAULT_SESSION_NAME "-", | |
1853 | strlen(DEFAULT_SESSION_NAME) + 1)) { | |
1854 | ret = snprintf(uris[0].subdir, sizeof(uris[0].subdir), "%s-%s", | |
1855 | name, datetime); | |
1856 | } else { | |
1857 | ret = snprintf(uris[0].subdir, sizeof(uris[0].subdir), "%s", name); | |
1858 | } | |
07424f16 DG |
1859 | if (ret < 0) { |
1860 | PERROR("snprintf uri subdir"); | |
3dd05a85 DG |
1861 | ret = -LTTNG_ERR_FATAL; |
1862 | goto error; | |
07424f16 DG |
1863 | } |
1864 | } | |
1865 | ||
cac3069d DG |
1866 | ret = lttng_ctl_ask_sessiond_varlen(&lsm, uris, |
1867 | sizeof(struct lttng_uri) * size, NULL); | |
3dd05a85 DG |
1868 | |
1869 | error: | |
1870 | free(uris); | |
1871 | return ret; | |
07424f16 DG |
1872 | } |
1873 | ||
806e2684 DG |
1874 | /* |
1875 | * For a given session name, this call checks if the data is ready to be read | |
1876 | * or is still being extracted by the consumer(s) hence not ready to be used by | |
1877 | * any readers. | |
1878 | */ | |
6d805429 | 1879 | int lttng_data_pending(const char *session_name) |
806e2684 DG |
1880 | { |
1881 | int ret; | |
1882 | struct lttcomm_session_msg lsm; | |
f6151c55 | 1883 | uint8_t *pending = NULL; |
806e2684 DG |
1884 | |
1885 | if (session_name == NULL) { | |
1886 | return -LTTNG_ERR_INVALID; | |
1887 | } | |
1888 | ||
53efb85a | 1889 | memset(&lsm, 0, sizeof(lsm)); |
6d805429 | 1890 | lsm.cmd_type = LTTNG_DATA_PENDING; |
806e2684 | 1891 | |
cac3069d DG |
1892 | lttng_ctl_copy_string(lsm.session.name, session_name, |
1893 | sizeof(lsm.session.name)); | |
806e2684 | 1894 | |
f6151c55 JG |
1895 | ret = lttng_ctl_ask_sessiond(&lsm, (void **) &pending); |
1896 | if (ret < 0) { | |
1897 | goto end; | |
1898 | } else if (ret != 1) { | |
1899 | /* Unexpected payload size */ | |
1900 | ret = -LTTNG_ERR_INVALID; | |
1901 | goto end; | |
806e2684 DG |
1902 | } |
1903 | ||
f6151c55 JG |
1904 | ret = (int) *pending; |
1905 | end: | |
1906 | free(pending); | |
806e2684 DG |
1907 | return ret; |
1908 | } | |
1909 | ||
27babd3a DG |
1910 | /* |
1911 | * Create a session exclusively used for snapshot. | |
1912 | * | |
1913 | * Returns LTTNG_OK on success or a negative error code. | |
1914 | */ | |
1915 | int lttng_create_session_snapshot(const char *name, const char *snapshot_url) | |
1916 | { | |
1917 | int ret; | |
1918 | ssize_t size; | |
1919 | struct lttcomm_session_msg lsm; | |
1920 | struct lttng_uri *uris = NULL; | |
1921 | ||
1922 | if (name == NULL) { | |
1923 | return -LTTNG_ERR_INVALID; | |
1924 | } | |
1925 | ||
1926 | memset(&lsm, 0, sizeof(lsm)); | |
1927 | ||
1928 | lsm.cmd_type = LTTNG_CREATE_SESSION_SNAPSHOT; | |
1929 | lttng_ctl_copy_string(lsm.session.name, name, sizeof(lsm.session.name)); | |
1930 | ||
1931 | size = uri_parse_str_urls(snapshot_url, NULL, &uris); | |
1932 | if (size < 0) { | |
1933 | return -LTTNG_ERR_INVALID; | |
1934 | } | |
1935 | ||
1936 | lsm.u.uri.size = size; | |
1937 | ||
1938 | ret = lttng_ctl_ask_sessiond_varlen(&lsm, uris, | |
1939 | sizeof(struct lttng_uri) * size, NULL); | |
1940 | ||
1941 | free(uris); | |
1942 | return ret; | |
1943 | } | |
1944 | ||
ecc48a90 JD |
1945 | /* |
1946 | * Create a session exclusively used for live. | |
1947 | * | |
1948 | * Returns LTTNG_OK on success or a negative error code. | |
1949 | */ | |
1950 | int lttng_create_session_live(const char *name, const char *url, | |
1951 | unsigned int timer_interval) | |
1952 | { | |
1953 | int ret; | |
1954 | ssize_t size; | |
1955 | struct lttcomm_session_msg lsm; | |
1956 | struct lttng_uri *uris = NULL; | |
1957 | ||
92805ee4 | 1958 | if (name == NULL || timer_interval == 0) { |
ecc48a90 JD |
1959 | return -LTTNG_ERR_INVALID; |
1960 | } | |
1961 | ||
1962 | memset(&lsm, 0, sizeof(lsm)); | |
1963 | ||
1964 | lsm.cmd_type = LTTNG_CREATE_SESSION_LIVE; | |
1965 | lttng_ctl_copy_string(lsm.session.name, name, sizeof(lsm.session.name)); | |
1966 | ||
1a241656 DG |
1967 | if (url) { |
1968 | size = uri_parse_str_urls(url, NULL, &uris); | |
1969 | if (size <= 0) { | |
1970 | ret = -LTTNG_ERR_INVALID; | |
1971 | goto end; | |
1972 | } | |
ecc48a90 | 1973 | |
1a241656 DG |
1974 | /* file:// is not accepted for live session. */ |
1975 | if (uris[0].dtype == LTTNG_DST_PATH) { | |
1976 | ret = -LTTNG_ERR_INVALID; | |
1977 | goto end; | |
1978 | } | |
1979 | } else { | |
1980 | size = 0; | |
ecc48a90 JD |
1981 | } |
1982 | ||
1983 | lsm.u.session_live.nb_uri = size; | |
1984 | lsm.u.session_live.timer_interval = timer_interval; | |
1985 | ||
1986 | ret = lttng_ctl_ask_sessiond_varlen(&lsm, uris, | |
1987 | sizeof(struct lttng_uri) * size, NULL); | |
1988 | ||
1989 | end: | |
1990 | free(uris); | |
1991 | return ret; | |
1992 | } | |
1993 | ||
a5dfbb9d MD |
1994 | /* |
1995 | * List PIDs in the tracker. | |
1996 | * | |
1997 | * @enabled is set to whether the PID tracker is enabled. | |
1998 | * @pids is set to an allocated array of PIDs currently tracked. On | |
1999 | * success, @pids must be freed by the caller. | |
2000 | * @nr_pids is set to the number of entries contained by the @pids array. | |
2001 | * | |
2002 | * Returns 0 on success, else a negative LTTng error code. | |
2003 | */ | |
2004 | int lttng_list_tracker_pids(struct lttng_handle *handle, | |
2005 | int *_enabled, int32_t **_pids, size_t *_nr_pids) | |
2006 | { | |
2007 | int ret, enabled = 1; | |
2008 | struct lttcomm_session_msg lsm; | |
2009 | size_t nr_pids; | |
2010 | int32_t *pids; | |
2011 | ||
2012 | if (handle == NULL) { | |
2013 | return -LTTNG_ERR_INVALID; | |
2014 | } | |
2015 | ||
2016 | memset(&lsm, 0, sizeof(lsm)); | |
2017 | lsm.cmd_type = LTTNG_LIST_TRACKER_PIDS; | |
2018 | lttng_ctl_copy_string(lsm.session.name, handle->session_name, | |
2019 | sizeof(lsm.session.name)); | |
2020 | lttng_ctl_copy_lttng_domain(&lsm.domain, &handle->domain); | |
2021 | ||
2022 | ret = lttng_ctl_ask_sessiond(&lsm, (void **) &pids); | |
2023 | if (ret < 0) { | |
2024 | return ret; | |
2025 | } | |
2026 | nr_pids = ret / sizeof(int32_t); | |
2027 | if (nr_pids == 1 && pids[0] == -1) { | |
2028 | free(pids); | |
2029 | pids = NULL; | |
2030 | enabled = 0; | |
2031 | nr_pids = 0; | |
2032 | } | |
2033 | *_enabled = enabled; | |
2034 | *_pids = pids; | |
2035 | *_nr_pids = nr_pids; | |
2036 | return 0; | |
2037 | } | |
2038 | ||
fac6795d DG |
2039 | /* |
2040 | * lib constructor | |
2041 | */ | |
2042 | static void __attribute__((constructor)) init() | |
2043 | { | |
2044 | /* Set default session group */ | |
bbccc3d2 | 2045 | lttng_set_tracing_group(DEFAULT_TRACING_GROUP); |
fac6795d | 2046 | } |
49cca668 DG |
2047 | |
2048 | /* | |
2049 | * lib destructor | |
2050 | */ | |
2051 | static void __attribute__((destructor)) lttng_ctl_exit() | |
2052 | { | |
2053 | free(tracing_group); | |
2054 | } |