Commit | Line | Data |
---|---|---|
826d496d | 1 | /* |
82a3637f DG |
2 | * liblttngctl.c |
3 | * | |
4 | * Linux Trace Toolkit Control Library | |
5 | * | |
826d496d | 6 | * Copyright (C) 2011 David Goulet <david.goulet@polymtl.ca> |
fac6795d | 7 | * |
d14d33bf AM |
8 | * This library is free software; you can redistribute it and/or modify it |
9 | * under the terms of the GNU Lesser General Public License, version 2.1 only, | |
10 | * as published by the Free Software Foundation. | |
82a3637f DG |
11 | * |
12 | * This library is distributed in the hope that it will be useful, | |
fac6795d | 13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
82a3637f DG |
14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
15 | * Lesser General Public License for more details. | |
16 | * | |
d14d33bf AM |
17 | * You should have received a copy of the GNU Lesser General Public License |
18 | * along with this library; if not, write to the Free Software Foundation, | |
19 | * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA | |
fac6795d DG |
20 | */ |
21 | ||
22 | #define _GNU_SOURCE | |
44a5e5eb | 23 | #include <assert.h> |
fac6795d | 24 | #include <grp.h> |
1e307fab | 25 | #include <errno.h> |
fac6795d DG |
26 | #include <stdio.h> |
27 | #include <stdlib.h> | |
28 | #include <string.h> | |
29 | #include <unistd.h> | |
30 | ||
990570ed DG |
31 | #include <common/common.h> |
32 | #include <common/defaults.h> | |
db758600 | 33 | #include <common/sessiond-comm/sessiond-comm.h> |
a4b92340 | 34 | #include <common/uri.h> |
feb0f3e5 | 35 | #include <common/utils.h> |
1e307fab | 36 | #include <lttng/lttng.h> |
0c89d795 | 37 | #include <lttng/health-internal.h> |
fac6795d | 38 | |
d00c599e DG |
39 | #include "filter/filter-ast.h" |
40 | #include "filter/filter-parser.h" | |
41 | #include "filter/filter-bytecode.h" | |
42 | #include "filter/memstream.h" | |
cac3069d | 43 | #include "lttng-ctl-helper.h" |
53a80697 MD |
44 | |
45 | #ifdef DEBUG | |
d00c599e | 46 | static const int print_xml = 1; |
53a80697 MD |
47 | #define dbg_printf(fmt, args...) \ |
48 | printf("[debug liblttng-ctl] " fmt, ## args) | |
49 | #else | |
d00c599e | 50 | static const int print_xml = 0; |
53a80697 MD |
51 | #define dbg_printf(fmt, args...) \ |
52 | do { \ | |
53 | /* do nothing but check printf format */ \ | |
54 | if (0) \ | |
55 | printf("[debug liblttnctl] " fmt, ## args); \ | |
56 | } while (0) | |
57 | #endif | |
58 | ||
59 | ||
fac6795d DG |
60 | /* Socket to session daemon for communication */ |
61 | static int sessiond_socket; | |
62 | static char sessiond_sock_path[PATH_MAX]; | |
63 | ||
fac6795d DG |
64 | /* Variables */ |
65 | static char *tracing_group; | |
66 | static int connected; | |
67 | ||
97e19046 DG |
68 | /* Global */ |
69 | ||
70 | /* | |
71 | * Those two variables are used by error.h to silent or control the verbosity of | |
72 | * error message. They are global to the library so application linking with it | |
73 | * are able to compile correctly and also control verbosity of the library. | |
97e19046 DG |
74 | */ |
75 | int lttng_opt_quiet; | |
76 | int lttng_opt_verbose; | |
77 | ||
99497cd0 MD |
78 | /* |
79 | * Copy string from src to dst and enforce null terminated byte. | |
80 | */ | |
cac3069d DG |
81 | LTTNG_HIDDEN |
82 | void lttng_ctl_copy_string(char *dst, const char *src, size_t len) | |
99497cd0 | 83 | { |
e7d6716d | 84 | if (src && dst) { |
99497cd0 MD |
85 | strncpy(dst, src, len); |
86 | /* Enforce the NULL terminated byte */ | |
87 | dst[len - 1] = '\0'; | |
cd80958d DG |
88 | } else if (dst) { |
89 | dst[0] = '\0'; | |
99497cd0 MD |
90 | } |
91 | } | |
92 | ||
fac6795d | 93 | /* |
cd80958d | 94 | * Copy domain to lttcomm_session_msg domain. |
fac6795d | 95 | * |
cd80958d DG |
96 | * If domain is unknown, default domain will be the kernel. |
97 | */ | |
cac3069d DG |
98 | LTTNG_HIDDEN |
99 | void lttng_ctl_copy_lttng_domain(struct lttng_domain *dst, | |
100 | struct lttng_domain *src) | |
cd80958d DG |
101 | { |
102 | if (src && dst) { | |
103 | switch (src->type) { | |
00e2e675 DG |
104 | case LTTNG_DOMAIN_KERNEL: |
105 | case LTTNG_DOMAIN_UST: | |
b9dfb167 | 106 | case LTTNG_DOMAIN_JUL: |
00e2e675 DG |
107 | memcpy(dst, src, sizeof(struct lttng_domain)); |
108 | break; | |
109 | default: | |
110 | memset(dst, 0, sizeof(struct lttng_domain)); | |
00e2e675 | 111 | break; |
cd80958d DG |
112 | } |
113 | } | |
114 | } | |
115 | ||
116 | /* | |
117 | * Send lttcomm_session_msg to the session daemon. | |
fac6795d | 118 | * |
1c8d13c8 TD |
119 | * On success, returns the number of bytes sent (>=0) |
120 | * On error, returns -1 | |
fac6795d | 121 | */ |
cd80958d | 122 | static int send_session_msg(struct lttcomm_session_msg *lsm) |
fac6795d DG |
123 | { |
124 | int ret; | |
125 | ||
126 | if (!connected) { | |
2f70b271 | 127 | ret = -LTTNG_ERR_NO_SESSIOND; |
e065084a | 128 | goto end; |
fac6795d DG |
129 | } |
130 | ||
a4b92340 DG |
131 | DBG("LSM cmd type : %d", lsm->cmd_type); |
132 | ||
be040666 | 133 | ret = lttcomm_send_creds_unix_sock(sessiond_socket, lsm, |
cd80958d | 134 | sizeof(struct lttcomm_session_msg)); |
2f70b271 DG |
135 | if (ret < 0) { |
136 | ret = -LTTNG_ERR_FATAL; | |
137 | } | |
e065084a DG |
138 | |
139 | end: | |
140 | return ret; | |
141 | } | |
142 | ||
53a80697 MD |
143 | /* |
144 | * Send var len data to the session daemon. | |
145 | * | |
146 | * On success, returns the number of bytes sent (>=0) | |
147 | * On error, returns -1 | |
148 | */ | |
149 | static int send_session_varlen(void *data, size_t len) | |
150 | { | |
151 | int ret; | |
152 | ||
153 | if (!connected) { | |
2f70b271 | 154 | ret = -LTTNG_ERR_NO_SESSIOND; |
53a80697 MD |
155 | goto end; |
156 | } | |
a4b92340 | 157 | |
53a80697 MD |
158 | if (!data || !len) { |
159 | ret = 0; | |
160 | goto end; | |
161 | } | |
162 | ||
163 | ret = lttcomm_send_unix_sock(sessiond_socket, data, len); | |
2f70b271 DG |
164 | if (ret < 0) { |
165 | ret = -LTTNG_ERR_FATAL; | |
166 | } | |
53a80697 MD |
167 | |
168 | end: | |
169 | return ret; | |
170 | } | |
171 | ||
e065084a | 172 | /* |
cd80958d | 173 | * Receive data from the sessiond socket. |
e065084a | 174 | * |
1c8d13c8 TD |
175 | * On success, returns the number of bytes received (>=0) |
176 | * On error, returns -1 (recvmsg() error) or -ENOTCONN | |
e065084a | 177 | */ |
ca95a216 | 178 | static int recv_data_sessiond(void *buf, size_t len) |
e065084a DG |
179 | { |
180 | int ret; | |
181 | ||
182 | if (!connected) { | |
2f70b271 | 183 | ret = -LTTNG_ERR_NO_SESSIOND; |
e065084a | 184 | goto end; |
fac6795d DG |
185 | } |
186 | ||
ca95a216 | 187 | ret = lttcomm_recv_unix_sock(sessiond_socket, buf, len); |
2f70b271 DG |
188 | if (ret < 0) { |
189 | ret = -LTTNG_ERR_FATAL; | |
190 | } | |
fac6795d | 191 | |
e065084a | 192 | end: |
fac6795d DG |
193 | return ret; |
194 | } | |
195 | ||
196 | /* | |
1c8d13c8 | 197 | * Check if we are in the specified group. |
65beb5ff | 198 | * |
2269e89e | 199 | * If yes return 1, else return -1. |
947308c4 | 200 | */ |
6c71277b MD |
201 | LTTNG_HIDDEN |
202 | int lttng_check_tracing_group(void) | |
947308c4 DG |
203 | { |
204 | struct group *grp_tracing; /* no free(). See getgrnam(3) */ | |
205 | gid_t *grp_list; | |
206 | int grp_list_size, grp_id, i; | |
207 | int ret = -1; | |
6c71277b | 208 | const char *grp_name = tracing_group; |
947308c4 DG |
209 | |
210 | /* Get GID of group 'tracing' */ | |
211 | grp_tracing = getgrnam(grp_name); | |
b4d8603b MD |
212 | if (!grp_tracing) { |
213 | /* If grp_tracing is NULL, the group does not exist. */ | |
947308c4 DG |
214 | goto end; |
215 | } | |
216 | ||
217 | /* Get number of supplementary group IDs */ | |
218 | grp_list_size = getgroups(0, NULL); | |
219 | if (grp_list_size < 0) { | |
220 | perror("getgroups"); | |
221 | goto end; | |
222 | } | |
223 | ||
224 | /* Alloc group list of the right size */ | |
225 | grp_list = malloc(grp_list_size * sizeof(gid_t)); | |
00795392 | 226 | if (!grp_list) { |
1c8d13c8 | 227 | perror("malloc"); |
00795392 MD |
228 | goto end; |
229 | } | |
947308c4 | 230 | grp_id = getgroups(grp_list_size, grp_list); |
1c8d13c8 | 231 | if (grp_id < 0) { |
947308c4 DG |
232 | perror("getgroups"); |
233 | goto free_list; | |
234 | } | |
235 | ||
236 | for (i = 0; i < grp_list_size; i++) { | |
237 | if (grp_list[i] == grp_tracing->gr_gid) { | |
2269e89e | 238 | ret = 1; |
947308c4 DG |
239 | break; |
240 | } | |
241 | } | |
242 | ||
243 | free_list: | |
244 | free(grp_list); | |
245 | ||
246 | end: | |
247 | return ret; | |
248 | } | |
249 | ||
250 | /* | |
2269e89e DG |
251 | * Try connect to session daemon with sock_path. |
252 | * | |
253 | * Return 0 on success, else -1 | |
254 | */ | |
255 | static int try_connect_sessiond(const char *sock_path) | |
256 | { | |
257 | int ret; | |
258 | ||
259 | /* If socket exist, we check if the daemon listens for connect. */ | |
260 | ret = access(sock_path, F_OK); | |
261 | if (ret < 0) { | |
262 | /* Not alive */ | |
2f70b271 | 263 | goto error; |
2269e89e DG |
264 | } |
265 | ||
266 | ret = lttcomm_connect_unix_sock(sock_path); | |
267 | if (ret < 0) { | |
268 | /* Not alive */ | |
2f70b271 | 269 | goto error; |
2269e89e DG |
270 | } |
271 | ||
272 | ret = lttcomm_close_unix_sock(ret); | |
273 | if (ret < 0) { | |
274 | perror("lttcomm_close_unix_sock"); | |
275 | } | |
276 | ||
277 | return 0; | |
2f70b271 DG |
278 | |
279 | error: | |
280 | return -1; | |
2269e89e DG |
281 | } |
282 | ||
283 | /* | |
2f70b271 DG |
284 | * Set sessiond socket path by putting it in the global sessiond_sock_path |
285 | * variable. | |
286 | * | |
287 | * Returns 0 on success, negative value on failure (the sessiond socket path | |
288 | * is somehow too long or ENOMEM). | |
947308c4 DG |
289 | */ |
290 | static int set_session_daemon_path(void) | |
291 | { | |
2269e89e DG |
292 | int in_tgroup = 0; /* In tracing group */ |
293 | uid_t uid; | |
294 | ||
295 | uid = getuid(); | |
947308c4 | 296 | |
2269e89e DG |
297 | if (uid != 0) { |
298 | /* Are we in the tracing group ? */ | |
6c71277b | 299 | in_tgroup = lttng_check_tracing_group(); |
2269e89e DG |
300 | } |
301 | ||
08a9c49f | 302 | if ((uid == 0) || in_tgroup) { |
cac3069d DG |
303 | lttng_ctl_copy_string(sessiond_sock_path, |
304 | DEFAULT_GLOBAL_CLIENT_UNIX_SOCK, sizeof(sessiond_sock_path)); | |
08a9c49f | 305 | } |
2269e89e | 306 | |
08a9c49f | 307 | if (uid != 0) { |
c617c0c6 MD |
308 | int ret; |
309 | ||
08a9c49f TD |
310 | if (in_tgroup) { |
311 | /* Tracing group */ | |
312 | ret = try_connect_sessiond(sessiond_sock_path); | |
313 | if (ret >= 0) { | |
314 | goto end; | |
2269e89e | 315 | } |
08a9c49f | 316 | /* Global session daemon not available... */ |
2269e89e | 317 | } |
08a9c49f TD |
318 | /* ...or not in tracing group (and not root), default */ |
319 | ||
320 | /* | |
321 | * With GNU C < 2.1, snprintf returns -1 if the target buffer is too small; | |
322 | * With GNU C >= 2.1, snprintf returns the required size (excluding closing null) | |
323 | */ | |
324 | ret = snprintf(sessiond_sock_path, sizeof(sessiond_sock_path), | |
feb0f3e5 | 325 | DEFAULT_HOME_CLIENT_UNIX_SOCK, utils_get_home_dir()); |
08a9c49f | 326 | if ((ret < 0) || (ret >= sizeof(sessiond_sock_path))) { |
2f70b271 | 327 | goto error; |
947308c4 | 328 | } |
947308c4 | 329 | } |
08a9c49f | 330 | end: |
947308c4 | 331 | return 0; |
2f70b271 DG |
332 | |
333 | error: | |
334 | return -1; | |
947308c4 DG |
335 | } |
336 | ||
65beb5ff DG |
337 | /* |
338 | * Connect to the LTTng session daemon. | |
339 | * | |
340 | * On success, return 0. On error, return -1. | |
341 | */ | |
342 | static int connect_sessiond(void) | |
343 | { | |
344 | int ret; | |
345 | ||
da3c9ec1 DG |
346 | /* Don't try to connect if already connected. */ |
347 | if (connected) { | |
348 | return 0; | |
349 | } | |
350 | ||
65beb5ff DG |
351 | ret = set_session_daemon_path(); |
352 | if (ret < 0) { | |
2f70b271 | 353 | goto error; |
65beb5ff DG |
354 | } |
355 | ||
356 | /* Connect to the sesssion daemon */ | |
357 | ret = lttcomm_connect_unix_sock(sessiond_sock_path); | |
358 | if (ret < 0) { | |
2f70b271 | 359 | goto error; |
65beb5ff DG |
360 | } |
361 | ||
362 | sessiond_socket = ret; | |
363 | connected = 1; | |
364 | ||
365 | return 0; | |
2f70b271 DG |
366 | |
367 | error: | |
368 | return -1; | |
65beb5ff DG |
369 | } |
370 | ||
371 | /* | |
1c8d13c8 TD |
372 | * Clean disconnect from the session daemon. |
373 | * On success, return 0. On error, return -1. | |
65beb5ff DG |
374 | */ |
375 | static int disconnect_sessiond(void) | |
376 | { | |
377 | int ret = 0; | |
378 | ||
379 | if (connected) { | |
380 | ret = lttcomm_close_unix_sock(sessiond_socket); | |
381 | sessiond_socket = 0; | |
382 | connected = 0; | |
383 | } | |
384 | ||
385 | return ret; | |
386 | } | |
387 | ||
35a6fdb7 | 388 | /* |
cd80958d | 389 | * Ask the session daemon a specific command and put the data into buf. |
53a80697 | 390 | * Takes extra var. len. data as input to send to the session daemon. |
65beb5ff | 391 | * |
af87c45a | 392 | * Return size of data (only payload, not header) or a negative error code. |
65beb5ff | 393 | */ |
cac3069d DG |
394 | LTTNG_HIDDEN |
395 | int lttng_ctl_ask_sessiond_varlen(struct lttcomm_session_msg *lsm, | |
a4b92340 | 396 | void *vardata, size_t varlen, void **buf) |
65beb5ff DG |
397 | { |
398 | int ret; | |
399 | size_t size; | |
400 | void *data = NULL; | |
cd80958d | 401 | struct lttcomm_lttng_msg llm; |
65beb5ff DG |
402 | |
403 | ret = connect_sessiond(); | |
404 | if (ret < 0) { | |
2f70b271 | 405 | ret = -LTTNG_ERR_NO_SESSIOND; |
65beb5ff DG |
406 | goto end; |
407 | } | |
408 | ||
65beb5ff | 409 | /* Send command to session daemon */ |
cd80958d | 410 | ret = send_session_msg(lsm); |
65beb5ff | 411 | if (ret < 0) { |
2f70b271 | 412 | /* Ret value is a valid lttng error code. */ |
65beb5ff DG |
413 | goto end; |
414 | } | |
53a80697 MD |
415 | /* Send var len data */ |
416 | ret = send_session_varlen(vardata, varlen); | |
417 | if (ret < 0) { | |
2f70b271 | 418 | /* Ret value is a valid lttng error code. */ |
53a80697 MD |
419 | goto end; |
420 | } | |
65beb5ff DG |
421 | |
422 | /* Get header from data transmission */ | |
423 | ret = recv_data_sessiond(&llm, sizeof(llm)); | |
424 | if (ret < 0) { | |
2f70b271 | 425 | /* Ret value is a valid lttng error code. */ |
65beb5ff DG |
426 | goto end; |
427 | } | |
428 | ||
429 | /* Check error code if OK */ | |
f73fabfd | 430 | if (llm.ret_code != LTTNG_OK) { |
65beb5ff DG |
431 | ret = -llm.ret_code; |
432 | goto end; | |
433 | } | |
434 | ||
435 | size = llm.data_size; | |
436 | if (size == 0) { | |
874d3f84 | 437 | /* If client free with size 0 */ |
a45d5536 DG |
438 | if (buf != NULL) { |
439 | *buf = NULL; | |
440 | } | |
7d29a247 | 441 | ret = 0; |
65beb5ff DG |
442 | goto end; |
443 | } | |
444 | ||
445 | data = (void*) malloc(size); | |
446 | ||
447 | /* Get payload data */ | |
448 | ret = recv_data_sessiond(data, size); | |
449 | if (ret < 0) { | |
450 | free(data); | |
451 | goto end; | |
452 | } | |
453 | ||
83009e5e DG |
454 | /* |
455 | * Extra protection not to dereference a NULL pointer. If buf is NULL at | |
456 | * this point, an error is returned and data is freed. | |
457 | */ | |
458 | if (buf == NULL) { | |
2f70b271 | 459 | ret = -LTTNG_ERR_INVALID; |
83009e5e DG |
460 | free(data); |
461 | goto end; | |
462 | } | |
463 | ||
65beb5ff DG |
464 | *buf = data; |
465 | ret = size; | |
466 | ||
467 | end: | |
468 | disconnect_sessiond(); | |
469 | return ret; | |
470 | } | |
471 | ||
9f19cc17 | 472 | /* |
cd80958d | 473 | * Create lttng handle and return pointer. |
1c8d13c8 | 474 | * The returned pointer will be NULL in case of malloc() error. |
9f19cc17 | 475 | */ |
cd80958d DG |
476 | struct lttng_handle *lttng_create_handle(const char *session_name, |
477 | struct lttng_domain *domain) | |
9f19cc17 | 478 | { |
2f70b271 DG |
479 | struct lttng_handle *handle = NULL; |
480 | ||
481 | if (domain == NULL) { | |
482 | goto end; | |
483 | } | |
cd80958d DG |
484 | |
485 | handle = malloc(sizeof(struct lttng_handle)); | |
486 | if (handle == NULL) { | |
2f70b271 | 487 | PERROR("malloc handle"); |
cd80958d DG |
488 | goto end; |
489 | } | |
490 | ||
491 | /* Copy session name */ | |
cac3069d | 492 | lttng_ctl_copy_string(handle->session_name, session_name, |
cd80958d DG |
493 | sizeof(handle->session_name)); |
494 | ||
495 | /* Copy lttng domain */ | |
cac3069d | 496 | lttng_ctl_copy_lttng_domain(&handle->domain, domain); |
cd80958d DG |
497 | |
498 | end: | |
499 | return handle; | |
500 | } | |
501 | ||
502 | /* | |
503 | * Destroy handle by free(3) the pointer. | |
504 | */ | |
505 | void lttng_destroy_handle(struct lttng_handle *handle) | |
506 | { | |
0e428499 | 507 | free(handle); |
eb354453 DG |
508 | } |
509 | ||
d9800920 DG |
510 | /* |
511 | * Register an outside consumer. | |
1c8d13c8 | 512 | * Returns size of returned session payload data or a negative error code. |
d9800920 DG |
513 | */ |
514 | int lttng_register_consumer(struct lttng_handle *handle, | |
515 | const char *socket_path) | |
516 | { | |
517 | struct lttcomm_session_msg lsm; | |
518 | ||
2f70b271 DG |
519 | if (handle == NULL || socket_path == NULL) { |
520 | return -LTTNG_ERR_INVALID; | |
521 | } | |
522 | ||
53efb85a | 523 | memset(&lsm, 0, sizeof(lsm)); |
d9800920 | 524 | lsm.cmd_type = LTTNG_REGISTER_CONSUMER; |
cac3069d | 525 | lttng_ctl_copy_string(lsm.session.name, handle->session_name, |
d9800920 | 526 | sizeof(lsm.session.name)); |
cac3069d | 527 | lttng_ctl_copy_lttng_domain(&lsm.domain, &handle->domain); |
d9800920 | 528 | |
cac3069d | 529 | lttng_ctl_copy_string(lsm.u.reg.path, socket_path, sizeof(lsm.u.reg.path)); |
d9800920 | 530 | |
cac3069d | 531 | return lttng_ctl_ask_sessiond(&lsm, NULL); |
d9800920 DG |
532 | } |
533 | ||
1df4dedd | 534 | /* |
1c8d13c8 TD |
535 | * Start tracing for all traces of the session. |
536 | * Returns size of returned session payload data or a negative error code. | |
1df4dedd | 537 | */ |
6a4f824d | 538 | int lttng_start_tracing(const char *session_name) |
f3ed775e | 539 | { |
cd80958d DG |
540 | struct lttcomm_session_msg lsm; |
541 | ||
6a4f824d | 542 | if (session_name == NULL) { |
2f70b271 | 543 | return -LTTNG_ERR_INVALID; |
cd80958d DG |
544 | } |
545 | ||
53efb85a | 546 | memset(&lsm, 0, sizeof(lsm)); |
cd80958d | 547 | lsm.cmd_type = LTTNG_START_TRACE; |
6a4f824d | 548 | |
cac3069d DG |
549 | lttng_ctl_copy_string(lsm.session.name, session_name, |
550 | sizeof(lsm.session.name)); | |
cd80958d | 551 | |
cac3069d | 552 | return lttng_ctl_ask_sessiond(&lsm, NULL); |
f3ed775e | 553 | } |
1df4dedd DG |
554 | |
555 | /* | |
38ee087f | 556 | * Stop tracing for all traces of the session. |
f3ed775e | 557 | */ |
38ee087f | 558 | static int _lttng_stop_tracing(const char *session_name, int wait) |
f3ed775e | 559 | { |
38ee087f | 560 | int ret, data_ret; |
cd80958d DG |
561 | struct lttcomm_session_msg lsm; |
562 | ||
6a4f824d | 563 | if (session_name == NULL) { |
2f70b271 | 564 | return -LTTNG_ERR_INVALID; |
6a4f824d DG |
565 | } |
566 | ||
53efb85a | 567 | memset(&lsm, 0, sizeof(lsm)); |
cd80958d | 568 | lsm.cmd_type = LTTNG_STOP_TRACE; |
6a4f824d | 569 | |
cac3069d DG |
570 | lttng_ctl_copy_string(lsm.session.name, session_name, |
571 | sizeof(lsm.session.name)); | |
cd80958d | 572 | |
cac3069d | 573 | ret = lttng_ctl_ask_sessiond(&lsm, NULL); |
38ee087f DG |
574 | if (ret < 0 && ret != -LTTNG_ERR_TRACE_ALREADY_STOPPED) { |
575 | goto error; | |
576 | } | |
577 | ||
578 | if (!wait) { | |
579 | goto end; | |
580 | } | |
581 | ||
38ee087f DG |
582 | /* Check for data availability */ |
583 | do { | |
6d805429 | 584 | data_ret = lttng_data_pending(session_name); |
38ee087f DG |
585 | if (data_ret < 0) { |
586 | /* Return the data available call error. */ | |
587 | ret = data_ret; | |
588 | goto error; | |
589 | } | |
590 | ||
591 | /* | |
592 | * Data sleep time before retrying (in usec). Don't sleep if the call | |
593 | * returned value indicates availability. | |
594 | */ | |
6d805429 | 595 | if (data_ret) { |
38ee087f | 596 | usleep(DEFAULT_DATA_AVAILABILITY_WAIT_TIME); |
38ee087f | 597 | } |
6d805429 | 598 | } while (data_ret != 0); |
38ee087f | 599 | |
38ee087f DG |
600 | end: |
601 | error: | |
602 | return ret; | |
603 | } | |
604 | ||
605 | /* | |
606 | * Stop tracing and wait for data availability. | |
607 | */ | |
608 | int lttng_stop_tracing(const char *session_name) | |
609 | { | |
610 | return _lttng_stop_tracing(session_name, 1); | |
611 | } | |
612 | ||
613 | /* | |
614 | * Stop tracing but _don't_ wait for data availability. | |
615 | */ | |
616 | int lttng_stop_tracing_no_wait(const char *session_name) | |
617 | { | |
618 | return _lttng_stop_tracing(session_name, 0); | |
f3ed775e DG |
619 | } |
620 | ||
621 | /* | |
601d5acf DG |
622 | * Add context to a channel. |
623 | * | |
624 | * If the given channel is NULL, add the contexts to all channels. | |
625 | * The event_name param is ignored. | |
af87c45a DG |
626 | * |
627 | * Returns the size of the returned payload data or a negative error code. | |
1df4dedd | 628 | */ |
cd80958d | 629 | int lttng_add_context(struct lttng_handle *handle, |
38057ed1 DG |
630 | struct lttng_event_context *ctx, const char *event_name, |
631 | const char *channel_name) | |
d65106b1 | 632 | { |
cd80958d DG |
633 | struct lttcomm_session_msg lsm; |
634 | ||
9d697d3d DG |
635 | /* Safety check. Both are mandatory */ |
636 | if (handle == NULL || ctx == NULL) { | |
2f70b271 | 637 | return -LTTNG_ERR_INVALID; |
cd80958d DG |
638 | } |
639 | ||
441c16a7 MD |
640 | memset(&lsm, 0, sizeof(lsm)); |
641 | ||
cd80958d DG |
642 | lsm.cmd_type = LTTNG_ADD_CONTEXT; |
643 | ||
85076754 MD |
644 | /* If no channel name, send empty string. */ |
645 | if (channel_name == NULL) { | |
646 | lttng_ctl_copy_string(lsm.u.context.channel_name, "", | |
647 | sizeof(lsm.u.context.channel_name)); | |
648 | } else { | |
649 | lttng_ctl_copy_string(lsm.u.context.channel_name, channel_name, | |
650 | sizeof(lsm.u.context.channel_name)); | |
651 | } | |
cd80958d | 652 | |
cac3069d | 653 | lttng_ctl_copy_lttng_domain(&lsm.domain, &handle->domain); |
d65106b1 | 654 | |
9d697d3d | 655 | memcpy(&lsm.u.context.ctx, ctx, sizeof(struct lttng_event_context)); |
d65106b1 | 656 | |
cac3069d | 657 | lttng_ctl_copy_string(lsm.session.name, handle->session_name, |
cd80958d DG |
658 | sizeof(lsm.session.name)); |
659 | ||
cac3069d | 660 | return lttng_ctl_ask_sessiond(&lsm, NULL); |
d65106b1 DG |
661 | } |
662 | ||
f3ed775e | 663 | /* |
1c8d13c8 TD |
664 | * Enable event(s) for a channel. |
665 | * If no event name is specified, all events are enabled. | |
666 | * If no channel name is specified, the default 'channel0' is used. | |
667 | * Returns size of returned session payload data or a negative error code. | |
f3ed775e | 668 | */ |
cd80958d | 669 | int lttng_enable_event(struct lttng_handle *handle, |
38057ed1 | 670 | struct lttng_event *ev, const char *channel_name) |
1df4dedd | 671 | { |
f8a96544 JI |
672 | return lttng_enable_event_with_exclusions(handle, ev, channel_name, |
673 | NULL, 0, NULL); | |
1df4dedd DG |
674 | } |
675 | ||
53a80697 | 676 | /* |
025faf73 | 677 | * Create or enable an event with a filter expression. |
178191b3 | 678 | * |
53a80697 MD |
679 | * Return negative error value on error. |
680 | * Return size of returned session payload data if OK. | |
681 | */ | |
025faf73 | 682 | int lttng_enable_event_with_filter(struct lttng_handle *handle, |
178191b3 | 683 | struct lttng_event *event, const char *channel_name, |
53a80697 MD |
684 | const char *filter_expression) |
685 | { | |
f8a96544 JI |
686 | return lttng_enable_event_with_exclusions(handle, event, channel_name, |
687 | filter_expression, 0, NULL); | |
53a80697 MD |
688 | } |
689 | ||
347c5ab5 DG |
690 | /* |
691 | * Depending on the event, return a newly allocated JUL filter expression or | |
692 | * NULL if not applicable. | |
693 | * | |
694 | * An event with NO loglevel and the name is * will return NULL. | |
695 | */ | |
696 | static char *set_jul_filter(const char *filter, struct lttng_event *ev) | |
697 | { | |
698 | int err; | |
699 | char *jul_filter = NULL; | |
700 | ||
701 | assert(ev); | |
702 | ||
703 | /* Don't add filter for the '*' event. */ | |
704 | if (ev->name[0] != '*') { | |
705 | if (filter) { | |
706 | err = asprintf(&jul_filter, "%s && logger_name == \"%s\"", filter, | |
707 | ev->name); | |
708 | } else { | |
709 | err = asprintf(&jul_filter, "logger_name == \"%s\"", ev->name); | |
710 | } | |
711 | if (err < 0) { | |
712 | PERROR("asprintf"); | |
6a556f7b | 713 | goto error; |
347c5ab5 DG |
714 | } |
715 | } | |
716 | ||
717 | /* Add loglevel filtering if any for the JUL domain. */ | |
718 | if (ev->loglevel_type != LTTNG_EVENT_LOGLEVEL_ALL) { | |
719 | char *op; | |
720 | ||
721 | if (ev->loglevel_type == LTTNG_EVENT_LOGLEVEL_RANGE) { | |
722 | op = ">="; | |
723 | } else { | |
724 | op = "=="; | |
725 | } | |
726 | ||
6a556f7b JG |
727 | if (filter || jul_filter) { |
728 | char *new_filter; | |
729 | ||
730 | err = asprintf(&new_filter, "%s && int_loglevel %s %d", | |
731 | jul_filter ? jul_filter : filter, op, | |
347c5ab5 | 732 | ev->loglevel); |
6a556f7b JG |
733 | if (jul_filter) { |
734 | free(jul_filter); | |
735 | } | |
736 | jul_filter = new_filter; | |
347c5ab5 DG |
737 | } else { |
738 | err = asprintf(&jul_filter, "int_loglevel %s %d", op, | |
739 | ev->loglevel); | |
740 | } | |
741 | if (err < 0) { | |
742 | PERROR("asprintf"); | |
6a556f7b | 743 | goto error; |
347c5ab5 DG |
744 | } |
745 | } | |
746 | ||
347c5ab5 | 747 | return jul_filter; |
6a556f7b JG |
748 | error: |
749 | free(jul_filter); | |
750 | return NULL; | |
347c5ab5 DG |
751 | } |
752 | ||
137b9942 DG |
753 | /* |
754 | * Generate the filter bytecode from a give filter expression string. Put the | |
755 | * newly allocated parser context in ctxp and populate the lsm object with the | |
756 | * expression len. | |
757 | * | |
758 | * Return 0 on success else a LTTNG_ERR_* code and ctxp is untouched. | |
759 | */ | |
760 | static int generate_filter(char *filter_expression, | |
761 | struct lttcomm_session_msg *lsm, struct filter_parser_ctx **ctxp) | |
762 | { | |
763 | int ret; | |
764 | struct filter_parser_ctx *ctx = NULL; | |
765 | FILE *fmem = NULL; | |
766 | ||
767 | assert(filter_expression); | |
768 | assert(lsm); | |
769 | assert(ctxp); | |
770 | ||
771 | /* | |
772 | * Casting const to non-const, as the underlying function will use it in | |
773 | * read-only mode. | |
774 | */ | |
775 | fmem = lttng_fmemopen((void *) filter_expression, | |
776 | strlen(filter_expression), "r"); | |
777 | if (!fmem) { | |
778 | fprintf(stderr, "Error opening memory as stream\n"); | |
779 | ret = -LTTNG_ERR_FILTER_NOMEM; | |
780 | goto error; | |
781 | } | |
782 | ctx = filter_parser_ctx_alloc(fmem); | |
783 | if (!ctx) { | |
784 | fprintf(stderr, "Error allocating parser\n"); | |
785 | ret = -LTTNG_ERR_FILTER_NOMEM; | |
786 | goto filter_alloc_error; | |
787 | } | |
788 | ret = filter_parser_ctx_append_ast(ctx); | |
789 | if (ret) { | |
790 | fprintf(stderr, "Parse error\n"); | |
791 | ret = -LTTNG_ERR_FILTER_INVAL; | |
792 | goto parse_error; | |
793 | } | |
794 | ret = filter_visitor_set_parent(ctx); | |
795 | if (ret) { | |
796 | fprintf(stderr, "Set parent error\n"); | |
797 | ret = -LTTNG_ERR_FILTER_INVAL; | |
798 | goto parse_error; | |
799 | } | |
800 | if (print_xml) { | |
801 | ret = filter_visitor_print_xml(ctx, stdout, 0); | |
802 | if (ret) { | |
803 | fflush(stdout); | |
804 | fprintf(stderr, "XML print error\n"); | |
805 | ret = -LTTNG_ERR_FILTER_INVAL; | |
806 | goto parse_error; | |
807 | } | |
808 | } | |
809 | ||
810 | dbg_printf("Generating IR... "); | |
811 | fflush(stdout); | |
812 | ret = filter_visitor_ir_generate(ctx); | |
813 | if (ret) { | |
814 | fprintf(stderr, "Generate IR error\n"); | |
815 | ret = -LTTNG_ERR_FILTER_INVAL; | |
816 | goto parse_error; | |
817 | } | |
818 | dbg_printf("done\n"); | |
819 | ||
820 | dbg_printf("Validating IR... "); | |
821 | fflush(stdout); | |
822 | ret = filter_visitor_ir_check_binary_op_nesting(ctx); | |
823 | if (ret) { | |
824 | ret = -LTTNG_ERR_FILTER_INVAL; | |
825 | goto parse_error; | |
826 | } | |
827 | dbg_printf("done\n"); | |
828 | ||
829 | dbg_printf("Generating bytecode... "); | |
830 | fflush(stdout); | |
831 | ret = filter_visitor_bytecode_generate(ctx); | |
832 | if (ret) { | |
833 | fprintf(stderr, "Generate bytecode error\n"); | |
834 | ret = -LTTNG_ERR_FILTER_INVAL; | |
835 | goto parse_error; | |
836 | } | |
837 | dbg_printf("done\n"); | |
838 | dbg_printf("Size of bytecode generated: %u bytes.\n", | |
839 | bytecode_get_len(&ctx->bytecode->b)); | |
840 | ||
841 | lsm->u.enable.bytecode_len = sizeof(ctx->bytecode->b) | |
842 | + bytecode_get_len(&ctx->bytecode->b); | |
843 | lsm->u.enable.expression_len = strlen(filter_expression) + 1; | |
844 | ||
845 | /* No need to keep the memory stream. */ | |
846 | if (fclose(fmem) != 0) { | |
847 | perror("fclose"); | |
848 | } | |
849 | ||
850 | *ctxp = ctx; | |
851 | return 0; | |
852 | ||
853 | parse_error: | |
137b9942 DG |
854 | filter_ir_free(ctx); |
855 | filter_parser_ctx_free(ctx); | |
856 | filter_alloc_error: | |
857 | if (fclose(fmem) != 0) { | |
858 | perror("fclose"); | |
859 | } | |
860 | error: | |
861 | return ret; | |
862 | } | |
863 | ||
93deb080 JI |
864 | /* |
865 | * Enable event(s) for a channel, possibly with exclusions and a filter. | |
866 | * If no event name is specified, all events are enabled. | |
867 | * If no channel name is specified, the default name is used. | |
868 | * If filter expression is not NULL, the filter is set for the event. | |
869 | * If exclusion count is not zero, the exclusions are set for the event. | |
870 | * Returns size of returned session payload data or a negative error code. | |
871 | */ | |
872 | int lttng_enable_event_with_exclusions(struct lttng_handle *handle, | |
873 | struct lttng_event *ev, const char *channel_name, | |
e9efbcd3 | 874 | const char *original_filter_expression, |
93deb080 JI |
875 | int exclusion_count, char **exclusion_list) |
876 | { | |
877 | struct lttcomm_session_msg lsm; | |
64226865 | 878 | char *varlen_data; |
93deb080 | 879 | int ret = 0; |
137b9942 | 880 | unsigned int free_filter_expression = 0; |
93deb080 | 881 | struct filter_parser_ctx *ctx = NULL; |
e9efbcd3 JG |
882 | /* |
883 | * Cast as non-const since we may replace the filter expression | |
884 | * by a dynamically allocated string. Otherwise, the original | |
885 | * string is not modified. | |
886 | */ | |
887 | char *filter_expression = (char *) original_filter_expression; | |
93deb080 JI |
888 | |
889 | if (handle == NULL || ev == NULL) { | |
137b9942 DG |
890 | ret = -LTTNG_ERR_INVALID; |
891 | goto error; | |
93deb080 JI |
892 | } |
893 | ||
894 | /* Empty filter string will always be rejected by the parser | |
895 | * anyway, so treat this corner-case early to eliminate | |
896 | * lttng_fmemopen error for 0-byte allocation. | |
897 | */ | |
898 | if (filter_expression && filter_expression[0] == '\0') { | |
137b9942 DG |
899 | ret = -LTTNG_ERR_INVALID; |
900 | goto error; | |
93deb080 JI |
901 | } |
902 | ||
903 | memset(&lsm, 0, sizeof(lsm)); | |
904 | ||
905 | /* If no channel name, send empty string. */ | |
906 | if (channel_name == NULL) { | |
907 | lttng_ctl_copy_string(lsm.u.enable.channel_name, "", | |
908 | sizeof(lsm.u.enable.channel_name)); | |
909 | } else { | |
910 | lttng_ctl_copy_string(lsm.u.enable.channel_name, channel_name, | |
911 | sizeof(lsm.u.enable.channel_name)); | |
912 | } | |
913 | ||
6565421f DG |
914 | if (ev->name[0] != '\0') { |
915 | lsm.cmd_type = LTTNG_ENABLE_EVENT; | |
916 | } else { | |
917 | lsm.cmd_type = LTTNG_ENABLE_ALL_EVENT; | |
918 | } | |
93deb080 | 919 | |
6565421f | 920 | lttng_ctl_copy_lttng_domain(&lsm.domain, &handle->domain); |
93deb080 JI |
921 | memcpy(&lsm.u.enable.event, ev, sizeof(lsm.u.enable.event)); |
922 | ||
923 | lttng_ctl_copy_string(lsm.session.name, handle->session_name, | |
924 | sizeof(lsm.session.name)); | |
925 | lsm.u.enable.exclusion_count = exclusion_count; | |
926 | lsm.u.enable.bytecode_len = 0; | |
927 | ||
9b21e6d5 DG |
928 | /* |
929 | * For the JUL domain, a filter is enforced except for the enable all | |
930 | * event. This is done to avoid having the event in all sessions thus | |
931 | * filtering by logger name. | |
932 | */ | |
933 | if (exclusion_count == 0 && filter_expression == NULL && | |
3e1c9ff7 DG |
934 | handle->domain.type != LTTNG_DOMAIN_JUL) { |
935 | goto ask_sessiond; | |
93deb080 JI |
936 | } |
937 | ||
938 | /* | |
939 | * We have either a filter or some exclusions, so we need to set up | |
940 | * a variable-length memory block from where to send the data | |
941 | */ | |
942 | ||
943 | /* Parse filter expression */ | |
3e1c9ff7 | 944 | if (filter_expression != NULL || handle->domain.type == LTTNG_DOMAIN_JUL) { |
9b21e6d5 | 945 | if (handle->domain.type == LTTNG_DOMAIN_JUL) { |
64226865 DG |
946 | char *jul_filter; |
947 | ||
347c5ab5 | 948 | /* Setup JUL filter if needed. */ |
64226865 | 949 | jul_filter = set_jul_filter(filter_expression, ev); |
137b9942 DG |
950 | if (!jul_filter) { |
951 | if (!filter_expression) { | |
952 | /* No JUL and no filter, just skip everything below. */ | |
953 | goto ask_sessiond; | |
954 | } | |
64226865 DG |
955 | } else { |
956 | /* | |
957 | * With a JUL filter, the original filter has been added to it | |
958 | * thus replace the filter expression. | |
959 | */ | |
e9efbcd3 JG |
960 | filter_expression = jul_filter; |
961 | free_filter_expression = 1; | |
9b21e6d5 | 962 | } |
9b21e6d5 | 963 | } |
93deb080 | 964 | |
137b9942 | 965 | ret = generate_filter(filter_expression, &lsm, &ctx); |
93deb080 | 966 | if (ret) { |
137b9942 | 967 | goto filter_error; |
93deb080 | 968 | } |
6b453b5e JG |
969 | } |
970 | ||
971 | varlen_data = zmalloc(lsm.u.enable.bytecode_len | |
137b9942 DG |
972 | + lsm.u.enable.expression_len |
973 | + LTTNG_SYMBOL_NAME_LEN * exclusion_count); | |
6b453b5e JG |
974 | if (!varlen_data) { |
975 | ret = -LTTNG_ERR_EXCLUSION_NOMEM; | |
137b9942 | 976 | goto filter_error; |
6b453b5e | 977 | } |
137b9942 | 978 | |
6b453b5e JG |
979 | /* Put exclusion names first in the data */ |
980 | while (exclusion_count--) { | |
981 | strncpy(varlen_data + LTTNG_SYMBOL_NAME_LEN * exclusion_count, | |
137b9942 | 982 | *(exclusion_list + exclusion_count), LTTNG_SYMBOL_NAME_LEN); |
6b453b5e JG |
983 | } |
984 | /* Add filter expression next */ | |
985 | if (lsm.u.enable.expression_len != 0) { | |
986 | memcpy(varlen_data | |
987 | + LTTNG_SYMBOL_NAME_LEN * lsm.u.enable.exclusion_count, | |
988 | filter_expression, | |
989 | lsm.u.enable.expression_len); | |
990 | } | |
991 | /* Add filter bytecode next */ | |
137b9942 | 992 | if (ctx && lsm.u.enable.bytecode_len != 0) { |
6b453b5e JG |
993 | memcpy(varlen_data |
994 | + LTTNG_SYMBOL_NAME_LEN * lsm.u.enable.exclusion_count | |
995 | + lsm.u.enable.expression_len, | |
996 | &ctx->bytecode->b, | |
997 | lsm.u.enable.bytecode_len); | |
93deb080 JI |
998 | } |
999 | ||
1000 | ret = lttng_ctl_ask_sessiond_varlen(&lsm, varlen_data, | |
67676bd8 | 1001 | (LTTNG_SYMBOL_NAME_LEN * lsm.u.enable.exclusion_count) + |
137b9942 | 1002 | lsm.u.enable.bytecode_len + lsm.u.enable.expression_len, NULL); |
6b453b5e | 1003 | free(varlen_data); |
93deb080 | 1004 | |
137b9942 | 1005 | filter_error: |
93deb080 JI |
1006 | if (filter_expression) { |
1007 | filter_bytecode_free(ctx); | |
1008 | filter_ir_free(ctx); | |
1009 | filter_parser_ctx_free(ctx); | |
e9efbcd3 JG |
1010 | if (free_filter_expression) { |
1011 | /* | |
1012 | * The filter expression has been replaced and must be | |
1013 | * freed as it is not the original filter expression | |
1014 | * received as a parameter. | |
1015 | */ | |
1016 | free(filter_expression); | |
1017 | } | |
93deb080 | 1018 | } |
137b9942 DG |
1019 | error: |
1020 | /* | |
1021 | * Return directly to the caller and don't ask the sessiond since something | |
1022 | * went wrong in the parsing of data above. | |
1023 | */ | |
93deb080 | 1024 | return ret; |
3e1c9ff7 DG |
1025 | |
1026 | ask_sessiond: | |
1027 | ret = lttng_ctl_ask_sessiond(&lsm, NULL); | |
1028 | return ret; | |
93deb080 JI |
1029 | } |
1030 | ||
1df4dedd | 1031 | /* |
1c8d13c8 TD |
1032 | * Disable event(s) of a channel and domain. |
1033 | * If no event name is specified, all events are disabled. | |
1034 | * If no channel name is specified, the default 'channel0' is used. | |
1035 | * Returns size of returned session payload data or a negative error code. | |
1df4dedd | 1036 | */ |
cd80958d | 1037 | int lttng_disable_event(struct lttng_handle *handle, const char *name, |
38057ed1 | 1038 | const char *channel_name) |
1df4dedd | 1039 | { |
cd80958d | 1040 | struct lttcomm_session_msg lsm; |
1df4dedd | 1041 | |
9d697d3d | 1042 | if (handle == NULL) { |
2f70b271 | 1043 | return -LTTNG_ERR_INVALID; |
cd80958d DG |
1044 | } |
1045 | ||
441c16a7 MD |
1046 | memset(&lsm, 0, sizeof(lsm)); |
1047 | ||
85076754 MD |
1048 | /* If no channel name, send empty string. */ |
1049 | if (channel_name == NULL) { | |
1050 | lttng_ctl_copy_string(lsm.u.disable.channel_name, "", | |
cd80958d | 1051 | sizeof(lsm.u.disable.channel_name)); |
f3ed775e | 1052 | } else { |
85076754 | 1053 | lttng_ctl_copy_string(lsm.u.disable.channel_name, channel_name, |
cd80958d | 1054 | sizeof(lsm.u.disable.channel_name)); |
eb354453 DG |
1055 | } |
1056 | ||
cac3069d | 1057 | lttng_ctl_copy_lttng_domain(&lsm.domain, &handle->domain); |
f5177a38 | 1058 | |
f84efadf | 1059 | if (name != NULL) { |
cac3069d DG |
1060 | lttng_ctl_copy_string(lsm.u.disable.name, name, |
1061 | sizeof(lsm.u.disable.name)); | |
cd80958d | 1062 | lsm.cmd_type = LTTNG_DISABLE_EVENT; |
f5177a38 | 1063 | } else { |
cd80958d | 1064 | lsm.cmd_type = LTTNG_DISABLE_ALL_EVENT; |
f3ed775e DG |
1065 | } |
1066 | ||
cac3069d | 1067 | lttng_ctl_copy_string(lsm.session.name, handle->session_name, |
cd80958d DG |
1068 | sizeof(lsm.session.name)); |
1069 | ||
cac3069d | 1070 | return lttng_ctl_ask_sessiond(&lsm, NULL); |
1df4dedd DG |
1071 | } |
1072 | ||
1073 | /* | |
1c8d13c8 TD |
1074 | * Enable channel per domain |
1075 | * Returns size of returned session payload data or a negative error code. | |
a5c5a2bd | 1076 | */ |
cd80958d | 1077 | int lttng_enable_channel(struct lttng_handle *handle, |
38057ed1 | 1078 | struct lttng_channel *chan) |
a5c5a2bd | 1079 | { |
cd80958d DG |
1080 | struct lttcomm_session_msg lsm; |
1081 | ||
5117eeec DG |
1082 | /* |
1083 | * NULL arguments are forbidden. No default values. | |
1084 | */ | |
1085 | if (handle == NULL || chan == NULL) { | |
2f70b271 | 1086 | return -LTTNG_ERR_INVALID; |
cd80958d DG |
1087 | } |
1088 | ||
441c16a7 MD |
1089 | memset(&lsm, 0, sizeof(lsm)); |
1090 | ||
5117eeec | 1091 | memcpy(&lsm.u.channel.chan, chan, sizeof(lsm.u.channel.chan)); |
7d29a247 | 1092 | |
cd80958d DG |
1093 | lsm.cmd_type = LTTNG_ENABLE_CHANNEL; |
1094 | ||
cac3069d | 1095 | lttng_ctl_copy_lttng_domain(&lsm.domain, &handle->domain); |
7d29a247 | 1096 | |
cac3069d | 1097 | lttng_ctl_copy_string(lsm.session.name, handle->session_name, |
cd80958d DG |
1098 | sizeof(lsm.session.name)); |
1099 | ||
cac3069d | 1100 | return lttng_ctl_ask_sessiond(&lsm, NULL); |
8c0faa1d | 1101 | } |
1df4dedd | 1102 | |
2ef84c95 | 1103 | /* |
1c8d13c8 TD |
1104 | * All tracing will be stopped for registered events of the channel. |
1105 | * Returns size of returned session payload data or a negative error code. | |
2ef84c95 | 1106 | */ |
cd80958d | 1107 | int lttng_disable_channel(struct lttng_handle *handle, const char *name) |
2ef84c95 | 1108 | { |
cd80958d DG |
1109 | struct lttcomm_session_msg lsm; |
1110 | ||
9d697d3d DG |
1111 | /* Safety check. Both are mandatory */ |
1112 | if (handle == NULL || name == NULL) { | |
2f70b271 | 1113 | return -LTTNG_ERR_INVALID; |
cd80958d DG |
1114 | } |
1115 | ||
441c16a7 MD |
1116 | memset(&lsm, 0, sizeof(lsm)); |
1117 | ||
cd80958d | 1118 | lsm.cmd_type = LTTNG_DISABLE_CHANNEL; |
1df4dedd | 1119 | |
cac3069d | 1120 | lttng_ctl_copy_string(lsm.u.disable.channel_name, name, |
9d697d3d DG |
1121 | sizeof(lsm.u.disable.channel_name)); |
1122 | ||
cac3069d | 1123 | lttng_ctl_copy_lttng_domain(&lsm.domain, &handle->domain); |
cd80958d | 1124 | |
cac3069d | 1125 | lttng_ctl_copy_string(lsm.session.name, handle->session_name, |
cd80958d DG |
1126 | sizeof(lsm.session.name)); |
1127 | ||
cac3069d | 1128 | return lttng_ctl_ask_sessiond(&lsm, NULL); |
ca95a216 DG |
1129 | } |
1130 | ||
fac6795d | 1131 | /* |
1c8d13c8 TD |
1132 | * Lists all available tracepoints of domain. |
1133 | * Sets the contents of the events array. | |
1134 | * Returns the number of lttng_event entries in events; | |
1135 | * on error, returns a negative value. | |
fac6795d | 1136 | */ |
cd80958d | 1137 | int lttng_list_tracepoints(struct lttng_handle *handle, |
2a71efd5 | 1138 | struct lttng_event **events) |
fac6795d | 1139 | { |
052da939 | 1140 | int ret; |
cd80958d DG |
1141 | struct lttcomm_session_msg lsm; |
1142 | ||
9d697d3d | 1143 | if (handle == NULL) { |
2f70b271 | 1144 | return -LTTNG_ERR_INVALID; |
cd80958d | 1145 | } |
fac6795d | 1146 | |
53efb85a | 1147 | memset(&lsm, 0, sizeof(lsm)); |
cd80958d | 1148 | lsm.cmd_type = LTTNG_LIST_TRACEPOINTS; |
cac3069d | 1149 | lttng_ctl_copy_lttng_domain(&lsm.domain, &handle->domain); |
2a71efd5 | 1150 | |
cac3069d | 1151 | ret = lttng_ctl_ask_sessiond(&lsm, (void **) events); |
052da939 DG |
1152 | if (ret < 0) { |
1153 | return ret; | |
eb354453 | 1154 | } |
fac6795d | 1155 | |
9f19cc17 | 1156 | return ret / sizeof(struct lttng_event); |
fac6795d DG |
1157 | } |
1158 | ||
f37d259d MD |
1159 | /* |
1160 | * Lists all available tracepoint fields of domain. | |
1161 | * Sets the contents of the event field array. | |
1162 | * Returns the number of lttng_event_field entries in events; | |
1163 | * on error, returns a negative value. | |
1164 | */ | |
1165 | int lttng_list_tracepoint_fields(struct lttng_handle *handle, | |
1166 | struct lttng_event_field **fields) | |
1167 | { | |
1168 | int ret; | |
1169 | struct lttcomm_session_msg lsm; | |
1170 | ||
1171 | if (handle == NULL) { | |
2f70b271 | 1172 | return -LTTNG_ERR_INVALID; |
f37d259d MD |
1173 | } |
1174 | ||
53efb85a | 1175 | memset(&lsm, 0, sizeof(lsm)); |
f37d259d | 1176 | lsm.cmd_type = LTTNG_LIST_TRACEPOINT_FIELDS; |
cac3069d | 1177 | lttng_ctl_copy_lttng_domain(&lsm.domain, &handle->domain); |
f37d259d | 1178 | |
cac3069d | 1179 | ret = lttng_ctl_ask_sessiond(&lsm, (void **) fields); |
f37d259d MD |
1180 | if (ret < 0) { |
1181 | return ret; | |
1182 | } | |
1183 | ||
1184 | return ret / sizeof(struct lttng_event_field); | |
1185 | } | |
1186 | ||
1657e9bb | 1187 | /* |
1c8d13c8 TD |
1188 | * Returns a human readable string describing |
1189 | * the error code (a negative value). | |
1657e9bb | 1190 | */ |
9a745bc7 | 1191 | const char *lttng_strerror(int code) |
1657e9bb | 1192 | { |
f73fabfd | 1193 | return error_get_str(code); |
1657e9bb DG |
1194 | } |
1195 | ||
aaf97519 | 1196 | /* |
a4b92340 DG |
1197 | * Create a brand new session using name and url for destination. |
1198 | * | |
f73fabfd | 1199 | * Returns LTTNG_OK on success or a negative error code. |
00e2e675 | 1200 | */ |
a4b92340 | 1201 | int lttng_create_session(const char *name, const char *url) |
00e2e675 | 1202 | { |
3dd05a85 | 1203 | int ret; |
a4b92340 | 1204 | ssize_t size; |
00e2e675 | 1205 | struct lttcomm_session_msg lsm; |
a4b92340 | 1206 | struct lttng_uri *uris = NULL; |
00e2e675 | 1207 | |
a4b92340 | 1208 | if (name == NULL) { |
2f70b271 | 1209 | return -LTTNG_ERR_INVALID; |
00e2e675 DG |
1210 | } |
1211 | ||
a4b92340 | 1212 | memset(&lsm, 0, sizeof(lsm)); |
00e2e675 | 1213 | |
a4b92340 | 1214 | lsm.cmd_type = LTTNG_CREATE_SESSION; |
cac3069d | 1215 | lttng_ctl_copy_string(lsm.session.name, name, sizeof(lsm.session.name)); |
a4b92340 DG |
1216 | |
1217 | /* There should never be a data URL */ | |
bc894455 | 1218 | size = uri_parse_str_urls(url, NULL, &uris); |
a4b92340 | 1219 | if (size < 0) { |
2f70b271 | 1220 | return -LTTNG_ERR_INVALID; |
00e2e675 DG |
1221 | } |
1222 | ||
a4b92340 DG |
1223 | lsm.u.uri.size = size; |
1224 | ||
cac3069d DG |
1225 | ret = lttng_ctl_ask_sessiond_varlen(&lsm, uris, |
1226 | sizeof(struct lttng_uri) * size, NULL); | |
3dd05a85 DG |
1227 | |
1228 | free(uris); | |
1229 | return ret; | |
00e2e675 DG |
1230 | } |
1231 | ||
8028d920 | 1232 | /* |
8028d920 | 1233 | * Destroy session using name. |
1c8d13c8 | 1234 | * Returns size of returned session payload data or a negative error code. |
8028d920 | 1235 | */ |
843f5df9 | 1236 | int lttng_destroy_session(const char *session_name) |
8028d920 | 1237 | { |
cd80958d DG |
1238 | struct lttcomm_session_msg lsm; |
1239 | ||
843f5df9 | 1240 | if (session_name == NULL) { |
2f70b271 | 1241 | return -LTTNG_ERR_INVALID; |
cd80958d DG |
1242 | } |
1243 | ||
53efb85a | 1244 | memset(&lsm, 0, sizeof(lsm)); |
cd80958d | 1245 | lsm.cmd_type = LTTNG_DESTROY_SESSION; |
843f5df9 | 1246 | |
cac3069d DG |
1247 | lttng_ctl_copy_string(lsm.session.name, session_name, |
1248 | sizeof(lsm.session.name)); | |
cd80958d | 1249 | |
cac3069d | 1250 | return lttng_ctl_ask_sessiond(&lsm, NULL); |
aaf97519 DG |
1251 | } |
1252 | ||
57167058 | 1253 | /* |
57167058 | 1254 | * Ask the session daemon for all available sessions. |
1c8d13c8 TD |
1255 | * Sets the contents of the sessions array. |
1256 | * Returns the number of lttng_session entries in sessions; | |
1257 | * on error, returns a negative value. | |
57167058 | 1258 | */ |
ca95a216 | 1259 | int lttng_list_sessions(struct lttng_session **sessions) |
57167058 | 1260 | { |
ca95a216 | 1261 | int ret; |
cd80958d | 1262 | struct lttcomm_session_msg lsm; |
57167058 | 1263 | |
53efb85a | 1264 | memset(&lsm, 0, sizeof(lsm)); |
cd80958d | 1265 | lsm.cmd_type = LTTNG_LIST_SESSIONS; |
cac3069d | 1266 | ret = lttng_ctl_ask_sessiond(&lsm, (void**) sessions); |
57167058 | 1267 | if (ret < 0) { |
ca95a216 | 1268 | return ret; |
57167058 DG |
1269 | } |
1270 | ||
ca95a216 | 1271 | return ret / sizeof(struct lttng_session); |
57167058 DG |
1272 | } |
1273 | ||
9f19cc17 | 1274 | /* |
1c8d13c8 TD |
1275 | * Ask the session daemon for all available domains of a session. |
1276 | * Sets the contents of the domains array. | |
1277 | * Returns the number of lttng_domain entries in domains; | |
1278 | * on error, returns a negative value. | |
9f19cc17 | 1279 | */ |
330be774 | 1280 | int lttng_list_domains(const char *session_name, |
cd80958d | 1281 | struct lttng_domain **domains) |
9f19cc17 DG |
1282 | { |
1283 | int ret; | |
cd80958d DG |
1284 | struct lttcomm_session_msg lsm; |
1285 | ||
330be774 | 1286 | if (session_name == NULL) { |
2f70b271 | 1287 | return -LTTNG_ERR_INVALID; |
cd80958d | 1288 | } |
9f19cc17 | 1289 | |
53efb85a | 1290 | memset(&lsm, 0, sizeof(lsm)); |
cd80958d DG |
1291 | lsm.cmd_type = LTTNG_LIST_DOMAINS; |
1292 | ||
cac3069d DG |
1293 | lttng_ctl_copy_string(lsm.session.name, session_name, |
1294 | sizeof(lsm.session.name)); | |
cd80958d | 1295 | |
cac3069d | 1296 | ret = lttng_ctl_ask_sessiond(&lsm, (void**) domains); |
9f19cc17 DG |
1297 | if (ret < 0) { |
1298 | return ret; | |
1299 | } | |
1300 | ||
1301 | return ret / sizeof(struct lttng_domain); | |
1302 | } | |
1303 | ||
1304 | /* | |
1c8d13c8 TD |
1305 | * Ask the session daemon for all available channels of a session. |
1306 | * Sets the contents of the channels array. | |
1307 | * Returns the number of lttng_channel entries in channels; | |
1308 | * on error, returns a negative value. | |
9f19cc17 | 1309 | */ |
cd80958d DG |
1310 | int lttng_list_channels(struct lttng_handle *handle, |
1311 | struct lttng_channel **channels) | |
9f19cc17 DG |
1312 | { |
1313 | int ret; | |
cd80958d DG |
1314 | struct lttcomm_session_msg lsm; |
1315 | ||
9d697d3d | 1316 | if (handle == NULL) { |
2f70b271 | 1317 | return -LTTNG_ERR_INVALID; |
cd80958d DG |
1318 | } |
1319 | ||
53efb85a | 1320 | memset(&lsm, 0, sizeof(lsm)); |
cd80958d | 1321 | lsm.cmd_type = LTTNG_LIST_CHANNELS; |
cac3069d | 1322 | lttng_ctl_copy_string(lsm.session.name, handle->session_name, |
cd80958d | 1323 | sizeof(lsm.session.name)); |
9f19cc17 | 1324 | |
cac3069d | 1325 | lttng_ctl_copy_lttng_domain(&lsm.domain, &handle->domain); |
9f19cc17 | 1326 | |
cac3069d | 1327 | ret = lttng_ctl_ask_sessiond(&lsm, (void**) channels); |
9f19cc17 DG |
1328 | if (ret < 0) { |
1329 | return ret; | |
1330 | } | |
1331 | ||
1332 | return ret / sizeof(struct lttng_channel); | |
1333 | } | |
1334 | ||
1335 | /* | |
1c8d13c8 TD |
1336 | * Ask the session daemon for all available events of a session channel. |
1337 | * Sets the contents of the events array. | |
1338 | * Returns the number of lttng_event entries in events; | |
1339 | * on error, returns a negative value. | |
9f19cc17 | 1340 | */ |
cd80958d DG |
1341 | int lttng_list_events(struct lttng_handle *handle, |
1342 | const char *channel_name, struct lttng_event **events) | |
9f19cc17 DG |
1343 | { |
1344 | int ret; | |
cd80958d | 1345 | struct lttcomm_session_msg lsm; |
9f19cc17 | 1346 | |
9d697d3d DG |
1347 | /* Safety check. An handle and channel name are mandatory */ |
1348 | if (handle == NULL || channel_name == NULL) { | |
2f70b271 | 1349 | return -LTTNG_ERR_INVALID; |
cd80958d DG |
1350 | } |
1351 | ||
53efb85a | 1352 | memset(&lsm, 0, sizeof(lsm)); |
cd80958d | 1353 | lsm.cmd_type = LTTNG_LIST_EVENTS; |
cac3069d | 1354 | lttng_ctl_copy_string(lsm.session.name, handle->session_name, |
cd80958d | 1355 | sizeof(lsm.session.name)); |
cac3069d | 1356 | lttng_ctl_copy_string(lsm.u.list.channel_name, channel_name, |
cd80958d DG |
1357 | sizeof(lsm.u.list.channel_name)); |
1358 | ||
cac3069d | 1359 | lttng_ctl_copy_lttng_domain(&lsm.domain, &handle->domain); |
9f19cc17 | 1360 | |
cac3069d | 1361 | ret = lttng_ctl_ask_sessiond(&lsm, (void**) events); |
9f19cc17 DG |
1362 | if (ret < 0) { |
1363 | return ret; | |
1364 | } | |
1365 | ||
1366 | return ret / sizeof(struct lttng_event); | |
1367 | } | |
1368 | ||
fac6795d | 1369 | /* |
1c8d13c8 TD |
1370 | * Sets the tracing_group variable with name. |
1371 | * This function allocates memory pointed to by tracing_group. | |
1372 | * On success, returns 0, on error, returns -1 (null name) or -ENOMEM. | |
fac6795d DG |
1373 | */ |
1374 | int lttng_set_tracing_group(const char *name) | |
1375 | { | |
9d697d3d | 1376 | if (name == NULL) { |
2f70b271 | 1377 | return -LTTNG_ERR_INVALID; |
9d697d3d DG |
1378 | } |
1379 | ||
fac6795d | 1380 | if (asprintf(&tracing_group, "%s", name) < 0) { |
2f70b271 | 1381 | return -LTTNG_ERR_FATAL; |
fac6795d DG |
1382 | } |
1383 | ||
1384 | return 0; | |
1385 | } | |
1386 | ||
d0254c7c | 1387 | /* |
af87c45a | 1388 | * Returns size of returned session payload data or a negative error code. |
d0254c7c | 1389 | */ |
cd80958d | 1390 | int lttng_calibrate(struct lttng_handle *handle, |
d0254c7c MD |
1391 | struct lttng_calibrate *calibrate) |
1392 | { | |
cd80958d | 1393 | struct lttcomm_session_msg lsm; |
d0254c7c | 1394 | |
9d697d3d DG |
1395 | /* Safety check. NULL pointer are forbidden */ |
1396 | if (handle == NULL || calibrate == NULL) { | |
2f70b271 | 1397 | return -LTTNG_ERR_INVALID; |
cd80958d | 1398 | } |
d0254c7c | 1399 | |
53efb85a | 1400 | memset(&lsm, 0, sizeof(lsm)); |
cd80958d | 1401 | lsm.cmd_type = LTTNG_CALIBRATE; |
cac3069d | 1402 | lttng_ctl_copy_lttng_domain(&lsm.domain, &handle->domain); |
d0254c7c | 1403 | |
cd80958d DG |
1404 | memcpy(&lsm.u.calibrate, calibrate, sizeof(lsm.u.calibrate)); |
1405 | ||
cac3069d | 1406 | return lttng_ctl_ask_sessiond(&lsm, NULL); |
d0254c7c MD |
1407 | } |
1408 | ||
5edd7e09 DG |
1409 | /* |
1410 | * Set default channel attributes. | |
441c16a7 | 1411 | * If either or both of the arguments are null, attr content is zeroe'd. |
5edd7e09 DG |
1412 | */ |
1413 | void lttng_channel_set_default_attr(struct lttng_domain *domain, | |
1414 | struct lttng_channel_attr *attr) | |
1415 | { | |
1416 | /* Safety check */ | |
1417 | if (attr == NULL || domain == NULL) { | |
1418 | return; | |
1419 | } | |
1420 | ||
eacaa7a6 DS |
1421 | memset(attr, 0, sizeof(struct lttng_channel_attr)); |
1422 | ||
0a9c6494 DG |
1423 | /* Same for all domains. */ |
1424 | attr->overwrite = DEFAULT_CHANNEL_OVERWRITE; | |
1425 | attr->tracefile_size = DEFAULT_CHANNEL_TRACEFILE_SIZE; | |
1426 | attr->tracefile_count = DEFAULT_CHANNEL_TRACEFILE_COUNT; | |
1427 | ||
5edd7e09 DG |
1428 | switch (domain->type) { |
1429 | case LTTNG_DOMAIN_KERNEL: | |
d92ff3ef DG |
1430 | attr->switch_timer_interval = DEFAULT_KERNEL_CHANNEL_SWITCH_TIMER; |
1431 | attr->read_timer_interval = DEFAULT_KERNEL_CHANNEL_READ_TIMER; | |
3e230f92 | 1432 | attr->subbuf_size = default_get_kernel_channel_subbuf_size(); |
5edd7e09 DG |
1433 | attr->num_subbuf = DEFAULT_KERNEL_CHANNEL_SUBBUF_NUM; |
1434 | attr->output = DEFAULT_KERNEL_CHANNEL_OUTPUT; | |
1435 | break; | |
1436 | case LTTNG_DOMAIN_UST: | |
0a9c6494 DG |
1437 | switch (domain->buf_type) { |
1438 | case LTTNG_BUFFER_PER_UID: | |
1439 | attr->subbuf_size = default_get_ust_uid_channel_subbuf_size(); | |
1440 | attr->num_subbuf = DEFAULT_UST_UID_CHANNEL_SUBBUF_NUM; | |
1441 | attr->output = DEFAULT_UST_UID_CHANNEL_OUTPUT; | |
1442 | attr->switch_timer_interval = DEFAULT_UST_UID_CHANNEL_SWITCH_TIMER; | |
1443 | attr->read_timer_interval = DEFAULT_UST_UID_CHANNEL_READ_TIMER; | |
1444 | break; | |
1445 | case LTTNG_BUFFER_PER_PID: | |
1446 | default: | |
1447 | attr->subbuf_size = default_get_ust_pid_channel_subbuf_size(); | |
1448 | attr->num_subbuf = DEFAULT_UST_PID_CHANNEL_SUBBUF_NUM; | |
1449 | attr->output = DEFAULT_UST_PID_CHANNEL_OUTPUT; | |
1450 | attr->switch_timer_interval = DEFAULT_UST_PID_CHANNEL_SWITCH_TIMER; | |
1451 | attr->read_timer_interval = DEFAULT_UST_PID_CHANNEL_READ_TIMER; | |
1452 | break; | |
1453 | } | |
5edd7e09 | 1454 | default: |
441c16a7 | 1455 | /* Default behavior: leave set to 0. */ |
5edd7e09 DG |
1456 | break; |
1457 | } | |
1458 | } | |
1459 | ||
fac6795d | 1460 | /* |
2269e89e | 1461 | * Check if session daemon is alive. |
fac6795d | 1462 | * |
2269e89e | 1463 | * Return 1 if alive or 0 if not. |
1c8d13c8 | 1464 | * On error returns a negative value. |
fac6795d | 1465 | */ |
947308c4 | 1466 | int lttng_session_daemon_alive(void) |
fac6795d DG |
1467 | { |
1468 | int ret; | |
1469 | ||
1470 | ret = set_session_daemon_path(); | |
1471 | if (ret < 0) { | |
947308c4 | 1472 | /* Error */ |
fac6795d DG |
1473 | return ret; |
1474 | } | |
1475 | ||
9d035200 | 1476 | if (*sessiond_sock_path == '\0') { |
2f70b271 DG |
1477 | /* |
1478 | * No socket path set. Weird error which means the constructor was not | |
1479 | * called. | |
1480 | */ | |
1481 | assert(0); | |
fac6795d DG |
1482 | } |
1483 | ||
2269e89e | 1484 | ret = try_connect_sessiond(sessiond_sock_path); |
7d8234d9 MD |
1485 | if (ret < 0) { |
1486 | /* Not alive */ | |
1487 | return 0; | |
1488 | } | |
7d8234d9 | 1489 | |
947308c4 DG |
1490 | /* Is alive */ |
1491 | return 1; | |
fac6795d DG |
1492 | } |
1493 | ||
00e2e675 | 1494 | /* |
a4b92340 | 1495 | * Set URL for a consumer for a session and domain. |
00e2e675 DG |
1496 | * |
1497 | * Return 0 on success, else a negative value. | |
1498 | */ | |
a4b92340 DG |
1499 | int lttng_set_consumer_url(struct lttng_handle *handle, |
1500 | const char *control_url, const char *data_url) | |
00e2e675 | 1501 | { |
3dd05a85 | 1502 | int ret; |
a4b92340 | 1503 | ssize_t size; |
00e2e675 | 1504 | struct lttcomm_session_msg lsm; |
a4b92340 | 1505 | struct lttng_uri *uris = NULL; |
00e2e675 | 1506 | |
a4b92340 | 1507 | if (handle == NULL || (control_url == NULL && data_url == NULL)) { |
2f70b271 | 1508 | return -LTTNG_ERR_INVALID; |
00e2e675 DG |
1509 | } |
1510 | ||
a4b92340 DG |
1511 | memset(&lsm, 0, sizeof(lsm)); |
1512 | ||
00e2e675 DG |
1513 | lsm.cmd_type = LTTNG_SET_CONSUMER_URI; |
1514 | ||
cac3069d | 1515 | lttng_ctl_copy_string(lsm.session.name, handle->session_name, |
00e2e675 | 1516 | sizeof(lsm.session.name)); |
cac3069d | 1517 | lttng_ctl_copy_lttng_domain(&lsm.domain, &handle->domain); |
00e2e675 | 1518 | |
bc894455 | 1519 | size = uri_parse_str_urls(control_url, data_url, &uris); |
a4b92340 | 1520 | if (size < 0) { |
2f70b271 | 1521 | return -LTTNG_ERR_INVALID; |
a4b92340 DG |
1522 | } |
1523 | ||
1524 | lsm.u.uri.size = size; | |
00e2e675 | 1525 | |
cac3069d DG |
1526 | ret = lttng_ctl_ask_sessiond_varlen(&lsm, uris, |
1527 | sizeof(struct lttng_uri) * size, NULL); | |
3dd05a85 DG |
1528 | |
1529 | free(uris); | |
1530 | return ret; | |
00e2e675 DG |
1531 | } |
1532 | ||
1533 | /* | |
9c6bda17 | 1534 | * [OBSOLETE] |
00e2e675 DG |
1535 | */ |
1536 | int lttng_enable_consumer(struct lttng_handle *handle) | |
1537 | { | |
785d2d0d | 1538 | return -ENOSYS; |
00e2e675 DG |
1539 | } |
1540 | ||
1541 | /* | |
9c6bda17 | 1542 | * [OBSOLETE] |
00e2e675 DG |
1543 | */ |
1544 | int lttng_disable_consumer(struct lttng_handle *handle) | |
1545 | { | |
785d2d0d | 1546 | return -ENOSYS; |
00e2e675 DG |
1547 | } |
1548 | ||
07424f16 DG |
1549 | /* |
1550 | * This is an extension of create session that is ONLY and SHOULD only be used | |
1551 | * by the lttng command line program. It exists to avoid using URI parsing in | |
1552 | * the lttng client. | |
1553 | * | |
1554 | * We need the date and time for the trace path subdirectory for the case where | |
1555 | * the user does NOT define one using either -o or -U. Using the normal | |
1556 | * lttng_create_session API call, we have no clue on the session daemon side if | |
1557 | * the URL was generated automatically by the client or define by the user. | |
1558 | * | |
1559 | * So this function "wrapper" is hidden from the public API, takes the datetime | |
1560 | * string and appends it if necessary to the URI subdirectory before sending it | |
1561 | * to the session daemon. | |
1562 | * | |
1563 | * With this extra function, the lttng_create_session call behavior is not | |
1564 | * changed and the timestamp is appended to the URI on the session daemon side | |
1565 | * if necessary. | |
1566 | */ | |
1567 | int _lttng_create_session_ext(const char *name, const char *url, | |
1568 | const char *datetime) | |
1569 | { | |
3dd05a85 | 1570 | int ret; |
07424f16 DG |
1571 | ssize_t size; |
1572 | struct lttcomm_session_msg lsm; | |
1573 | struct lttng_uri *uris = NULL; | |
1574 | ||
2bba9e53 | 1575 | if (name == NULL || datetime == NULL) { |
2f70b271 | 1576 | return -LTTNG_ERR_INVALID; |
07424f16 DG |
1577 | } |
1578 | ||
1579 | memset(&lsm, 0, sizeof(lsm)); | |
1580 | ||
1581 | lsm.cmd_type = LTTNG_CREATE_SESSION; | |
cac3069d | 1582 | lttng_ctl_copy_string(lsm.session.name, name, sizeof(lsm.session.name)); |
07424f16 DG |
1583 | |
1584 | /* There should never be a data URL */ | |
bc894455 | 1585 | size = uri_parse_str_urls(url, NULL, &uris); |
07424f16 | 1586 | if (size < 0) { |
3dd05a85 DG |
1587 | ret = -LTTNG_ERR_INVALID; |
1588 | goto error; | |
07424f16 DG |
1589 | } |
1590 | ||
1591 | lsm.u.uri.size = size; | |
1592 | ||
4b35a6b3 | 1593 | if (size > 0 && uris[0].dtype != LTTNG_DST_PATH && strlen(uris[0].subdir) == 0) { |
da4aa2b8 DG |
1594 | /* Don't append datetime if the name was automatically created. */ |
1595 | if (strncmp(name, DEFAULT_SESSION_NAME "-", | |
1596 | strlen(DEFAULT_SESSION_NAME) + 1)) { | |
1597 | ret = snprintf(uris[0].subdir, sizeof(uris[0].subdir), "%s-%s", | |
1598 | name, datetime); | |
1599 | } else { | |
1600 | ret = snprintf(uris[0].subdir, sizeof(uris[0].subdir), "%s", name); | |
1601 | } | |
07424f16 DG |
1602 | if (ret < 0) { |
1603 | PERROR("snprintf uri subdir"); | |
3dd05a85 DG |
1604 | ret = -LTTNG_ERR_FATAL; |
1605 | goto error; | |
07424f16 DG |
1606 | } |
1607 | } | |
1608 | ||
cac3069d DG |
1609 | ret = lttng_ctl_ask_sessiond_varlen(&lsm, uris, |
1610 | sizeof(struct lttng_uri) * size, NULL); | |
3dd05a85 DG |
1611 | |
1612 | error: | |
1613 | free(uris); | |
1614 | return ret; | |
07424f16 DG |
1615 | } |
1616 | ||
806e2684 DG |
1617 | /* |
1618 | * For a given session name, this call checks if the data is ready to be read | |
1619 | * or is still being extracted by the consumer(s) hence not ready to be used by | |
1620 | * any readers. | |
1621 | */ | |
6d805429 | 1622 | int lttng_data_pending(const char *session_name) |
806e2684 DG |
1623 | { |
1624 | int ret; | |
1625 | struct lttcomm_session_msg lsm; | |
1626 | ||
1627 | if (session_name == NULL) { | |
1628 | return -LTTNG_ERR_INVALID; | |
1629 | } | |
1630 | ||
53efb85a | 1631 | memset(&lsm, 0, sizeof(lsm)); |
6d805429 | 1632 | lsm.cmd_type = LTTNG_DATA_PENDING; |
806e2684 | 1633 | |
cac3069d DG |
1634 | lttng_ctl_copy_string(lsm.session.name, session_name, |
1635 | sizeof(lsm.session.name)); | |
806e2684 | 1636 | |
cac3069d | 1637 | ret = lttng_ctl_ask_sessiond(&lsm, NULL); |
806e2684 DG |
1638 | |
1639 | /* | |
cac3069d DG |
1640 | * The lttng_ctl_ask_sessiond function negate the return code if it's not |
1641 | * LTTNG_OK so getting -1 means that the reply ret_code was 1 thus meaning | |
1642 | * that the data is available. Yes it is hackish but for now this is the | |
1643 | * only way. | |
806e2684 DG |
1644 | */ |
1645 | if (ret == -1) { | |
1646 | ret = 1; | |
1647 | } | |
1648 | ||
1649 | return ret; | |
1650 | } | |
1651 | ||
27babd3a DG |
1652 | /* |
1653 | * Create a session exclusively used for snapshot. | |
1654 | * | |
1655 | * Returns LTTNG_OK on success or a negative error code. | |
1656 | */ | |
1657 | int lttng_create_session_snapshot(const char *name, const char *snapshot_url) | |
1658 | { | |
1659 | int ret; | |
1660 | ssize_t size; | |
1661 | struct lttcomm_session_msg lsm; | |
1662 | struct lttng_uri *uris = NULL; | |
1663 | ||
1664 | if (name == NULL) { | |
1665 | return -LTTNG_ERR_INVALID; | |
1666 | } | |
1667 | ||
1668 | memset(&lsm, 0, sizeof(lsm)); | |
1669 | ||
1670 | lsm.cmd_type = LTTNG_CREATE_SESSION_SNAPSHOT; | |
1671 | lttng_ctl_copy_string(lsm.session.name, name, sizeof(lsm.session.name)); | |
1672 | ||
1673 | size = uri_parse_str_urls(snapshot_url, NULL, &uris); | |
1674 | if (size < 0) { | |
1675 | return -LTTNG_ERR_INVALID; | |
1676 | } | |
1677 | ||
1678 | lsm.u.uri.size = size; | |
1679 | ||
1680 | ret = lttng_ctl_ask_sessiond_varlen(&lsm, uris, | |
1681 | sizeof(struct lttng_uri) * size, NULL); | |
1682 | ||
1683 | free(uris); | |
1684 | return ret; | |
1685 | } | |
1686 | ||
ecc48a90 JD |
1687 | /* |
1688 | * Create a session exclusively used for live. | |
1689 | * | |
1690 | * Returns LTTNG_OK on success or a negative error code. | |
1691 | */ | |
1692 | int lttng_create_session_live(const char *name, const char *url, | |
1693 | unsigned int timer_interval) | |
1694 | { | |
1695 | int ret; | |
1696 | ssize_t size; | |
1697 | struct lttcomm_session_msg lsm; | |
1698 | struct lttng_uri *uris = NULL; | |
1699 | ||
1700 | if (name == NULL) { | |
1701 | return -LTTNG_ERR_INVALID; | |
1702 | } | |
1703 | ||
1704 | memset(&lsm, 0, sizeof(lsm)); | |
1705 | ||
1706 | lsm.cmd_type = LTTNG_CREATE_SESSION_LIVE; | |
1707 | lttng_ctl_copy_string(lsm.session.name, name, sizeof(lsm.session.name)); | |
1708 | ||
1a241656 DG |
1709 | if (url) { |
1710 | size = uri_parse_str_urls(url, NULL, &uris); | |
1711 | if (size <= 0) { | |
1712 | ret = -LTTNG_ERR_INVALID; | |
1713 | goto end; | |
1714 | } | |
ecc48a90 | 1715 | |
1a241656 DG |
1716 | /* file:// is not accepted for live session. */ |
1717 | if (uris[0].dtype == LTTNG_DST_PATH) { | |
1718 | ret = -LTTNG_ERR_INVALID; | |
1719 | goto end; | |
1720 | } | |
1721 | } else { | |
1722 | size = 0; | |
ecc48a90 JD |
1723 | } |
1724 | ||
1725 | lsm.u.session_live.nb_uri = size; | |
1726 | lsm.u.session_live.timer_interval = timer_interval; | |
1727 | ||
1728 | ret = lttng_ctl_ask_sessiond_varlen(&lsm, uris, | |
1729 | sizeof(struct lttng_uri) * size, NULL); | |
1730 | ||
1731 | end: | |
1732 | free(uris); | |
1733 | return ret; | |
1734 | } | |
1735 | ||
fac6795d DG |
1736 | /* |
1737 | * lib constructor | |
1738 | */ | |
1739 | static void __attribute__((constructor)) init() | |
1740 | { | |
1741 | /* Set default session group */ | |
bbccc3d2 | 1742 | lttng_set_tracing_group(DEFAULT_TRACING_GROUP); |
fac6795d | 1743 | } |
49cca668 DG |
1744 | |
1745 | /* | |
1746 | * lib destructor | |
1747 | */ | |
1748 | static void __attribute__((destructor)) lttng_ctl_exit() | |
1749 | { | |
1750 | free(tracing_group); | |
1751 | } |