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> |
fac6795d | 37 | |
d00c599e DG |
38 | #include "filter/filter-ast.h" |
39 | #include "filter/filter-parser.h" | |
40 | #include "filter/filter-bytecode.h" | |
41 | #include "filter/memstream.h" | |
cac3069d | 42 | #include "lttng-ctl-helper.h" |
53a80697 MD |
43 | |
44 | #ifdef DEBUG | |
d00c599e | 45 | static const int print_xml = 1; |
53a80697 MD |
46 | #define dbg_printf(fmt, args...) \ |
47 | printf("[debug liblttng-ctl] " fmt, ## args) | |
48 | #else | |
d00c599e | 49 | static const int print_xml = 0; |
53a80697 MD |
50 | #define dbg_printf(fmt, args...) \ |
51 | do { \ | |
52 | /* do nothing but check printf format */ \ | |
53 | if (0) \ | |
54 | printf("[debug liblttnctl] " fmt, ## args); \ | |
55 | } while (0) | |
56 | #endif | |
57 | ||
58 | ||
fac6795d DG |
59 | /* Socket to session daemon for communication */ |
60 | static int sessiond_socket; | |
61 | static char sessiond_sock_path[PATH_MAX]; | |
44a5e5eb | 62 | static char health_sock_path[PATH_MAX]; |
fac6795d | 63 | |
fac6795d DG |
64 | /* Variables */ |
65 | static char *tracing_group; | |
66 | static int connected; | |
67 | ||
97e19046 DG |
68 | /* Global */ |
69 | ||
70 | /* | |
71 | * Those two variables are used by error.h to silent or control the verbosity of | |
72 | * error message. They are global to the library so application linking with it | |
73 | * are able to compile correctly and also control verbosity of the library. | |
97e19046 DG |
74 | */ |
75 | int lttng_opt_quiet; | |
76 | int lttng_opt_verbose; | |
77 | ||
99497cd0 MD |
78 | /* |
79 | * Copy string from src to dst and enforce null terminated byte. | |
80 | */ | |
cac3069d DG |
81 | LTTNG_HIDDEN |
82 | void lttng_ctl_copy_string(char *dst, const char *src, size_t len) | |
99497cd0 | 83 | { |
e7d6716d | 84 | if (src && dst) { |
99497cd0 MD |
85 | strncpy(dst, src, len); |
86 | /* Enforce the NULL terminated byte */ | |
87 | dst[len - 1] = '\0'; | |
cd80958d DG |
88 | } else if (dst) { |
89 | dst[0] = '\0'; | |
99497cd0 MD |
90 | } |
91 | } | |
92 | ||
fac6795d | 93 | /* |
cd80958d | 94 | * Copy domain to lttcomm_session_msg domain. |
fac6795d | 95 | * |
cd80958d DG |
96 | * If domain is unknown, default domain will be the kernel. |
97 | */ | |
cac3069d DG |
98 | LTTNG_HIDDEN |
99 | void lttng_ctl_copy_lttng_domain(struct lttng_domain *dst, | |
100 | struct lttng_domain *src) | |
cd80958d DG |
101 | { |
102 | if (src && dst) { | |
103 | switch (src->type) { | |
00e2e675 DG |
104 | case LTTNG_DOMAIN_KERNEL: |
105 | case LTTNG_DOMAIN_UST: | |
00e2e675 DG |
106 | memcpy(dst, src, sizeof(struct lttng_domain)); |
107 | break; | |
108 | default: | |
109 | memset(dst, 0, sizeof(struct lttng_domain)); | |
00e2e675 | 110 | break; |
cd80958d DG |
111 | } |
112 | } | |
113 | } | |
114 | ||
115 | /* | |
116 | * Send lttcomm_session_msg to the session daemon. | |
fac6795d | 117 | * |
1c8d13c8 TD |
118 | * On success, returns the number of bytes sent (>=0) |
119 | * On error, returns -1 | |
fac6795d | 120 | */ |
cd80958d | 121 | static int send_session_msg(struct lttcomm_session_msg *lsm) |
fac6795d DG |
122 | { |
123 | int ret; | |
124 | ||
125 | if (!connected) { | |
2f70b271 | 126 | ret = -LTTNG_ERR_NO_SESSIOND; |
e065084a | 127 | goto end; |
fac6795d DG |
128 | } |
129 | ||
a4b92340 DG |
130 | DBG("LSM cmd type : %d", lsm->cmd_type); |
131 | ||
be040666 | 132 | ret = lttcomm_send_creds_unix_sock(sessiond_socket, lsm, |
cd80958d | 133 | sizeof(struct lttcomm_session_msg)); |
2f70b271 DG |
134 | if (ret < 0) { |
135 | ret = -LTTNG_ERR_FATAL; | |
136 | } | |
e065084a DG |
137 | |
138 | end: | |
139 | return ret; | |
140 | } | |
141 | ||
53a80697 MD |
142 | /* |
143 | * Send var len data to the session daemon. | |
144 | * | |
145 | * On success, returns the number of bytes sent (>=0) | |
146 | * On error, returns -1 | |
147 | */ | |
148 | static int send_session_varlen(void *data, size_t len) | |
149 | { | |
150 | int ret; | |
151 | ||
152 | if (!connected) { | |
2f70b271 | 153 | ret = -LTTNG_ERR_NO_SESSIOND; |
53a80697 MD |
154 | goto end; |
155 | } | |
a4b92340 | 156 | |
53a80697 MD |
157 | if (!data || !len) { |
158 | ret = 0; | |
159 | goto end; | |
160 | } | |
161 | ||
162 | ret = lttcomm_send_unix_sock(sessiond_socket, data, len); | |
2f70b271 DG |
163 | if (ret < 0) { |
164 | ret = -LTTNG_ERR_FATAL; | |
165 | } | |
53a80697 MD |
166 | |
167 | end: | |
168 | return ret; | |
169 | } | |
170 | ||
e065084a | 171 | /* |
cd80958d | 172 | * Receive data from the sessiond socket. |
e065084a | 173 | * |
1c8d13c8 TD |
174 | * On success, returns the number of bytes received (>=0) |
175 | * On error, returns -1 (recvmsg() error) or -ENOTCONN | |
e065084a | 176 | */ |
ca95a216 | 177 | static int recv_data_sessiond(void *buf, size_t len) |
e065084a DG |
178 | { |
179 | int ret; | |
180 | ||
181 | if (!connected) { | |
2f70b271 | 182 | ret = -LTTNG_ERR_NO_SESSIOND; |
e065084a | 183 | goto end; |
fac6795d DG |
184 | } |
185 | ||
ca95a216 | 186 | ret = lttcomm_recv_unix_sock(sessiond_socket, buf, len); |
2f70b271 DG |
187 | if (ret < 0) { |
188 | ret = -LTTNG_ERR_FATAL; | |
189 | } | |
fac6795d | 190 | |
e065084a | 191 | end: |
fac6795d DG |
192 | return ret; |
193 | } | |
194 | ||
195 | /* | |
1c8d13c8 | 196 | * Check if we are in the specified group. |
65beb5ff | 197 | * |
2269e89e | 198 | * If yes return 1, else return -1. |
947308c4 DG |
199 | */ |
200 | static int check_tracing_group(const char *grp_name) | |
201 | { | |
202 | struct group *grp_tracing; /* no free(). See getgrnam(3) */ | |
203 | gid_t *grp_list; | |
204 | int grp_list_size, grp_id, i; | |
205 | int ret = -1; | |
206 | ||
207 | /* Get GID of group 'tracing' */ | |
208 | grp_tracing = getgrnam(grp_name); | |
b4d8603b MD |
209 | if (!grp_tracing) { |
210 | /* If grp_tracing is NULL, the group does not exist. */ | |
947308c4 DG |
211 | goto end; |
212 | } | |
213 | ||
214 | /* Get number of supplementary group IDs */ | |
215 | grp_list_size = getgroups(0, NULL); | |
216 | if (grp_list_size < 0) { | |
217 | perror("getgroups"); | |
218 | goto end; | |
219 | } | |
220 | ||
221 | /* Alloc group list of the right size */ | |
222 | grp_list = malloc(grp_list_size * sizeof(gid_t)); | |
00795392 | 223 | if (!grp_list) { |
1c8d13c8 | 224 | perror("malloc"); |
00795392 MD |
225 | goto end; |
226 | } | |
947308c4 | 227 | grp_id = getgroups(grp_list_size, grp_list); |
1c8d13c8 | 228 | if (grp_id < 0) { |
947308c4 DG |
229 | perror("getgroups"); |
230 | goto free_list; | |
231 | } | |
232 | ||
233 | for (i = 0; i < grp_list_size; i++) { | |
234 | if (grp_list[i] == grp_tracing->gr_gid) { | |
2269e89e | 235 | ret = 1; |
947308c4 DG |
236 | break; |
237 | } | |
238 | } | |
239 | ||
240 | free_list: | |
241 | free(grp_list); | |
242 | ||
243 | end: | |
244 | return ret; | |
245 | } | |
246 | ||
247 | /* | |
2269e89e DG |
248 | * Try connect to session daemon with sock_path. |
249 | * | |
250 | * Return 0 on success, else -1 | |
251 | */ | |
252 | static int try_connect_sessiond(const char *sock_path) | |
253 | { | |
254 | int ret; | |
255 | ||
256 | /* If socket exist, we check if the daemon listens for connect. */ | |
257 | ret = access(sock_path, F_OK); | |
258 | if (ret < 0) { | |
259 | /* Not alive */ | |
2f70b271 | 260 | goto error; |
2269e89e DG |
261 | } |
262 | ||
263 | ret = lttcomm_connect_unix_sock(sock_path); | |
264 | if (ret < 0) { | |
265 | /* Not alive */ | |
2f70b271 | 266 | goto error; |
2269e89e DG |
267 | } |
268 | ||
269 | ret = lttcomm_close_unix_sock(ret); | |
270 | if (ret < 0) { | |
271 | perror("lttcomm_close_unix_sock"); | |
272 | } | |
273 | ||
274 | return 0; | |
2f70b271 DG |
275 | |
276 | error: | |
277 | return -1; | |
2269e89e DG |
278 | } |
279 | ||
280 | /* | |
2f70b271 DG |
281 | * Set sessiond socket path by putting it in the global sessiond_sock_path |
282 | * variable. | |
283 | * | |
284 | * Returns 0 on success, negative value on failure (the sessiond socket path | |
285 | * is somehow too long or ENOMEM). | |
947308c4 DG |
286 | */ |
287 | static int set_session_daemon_path(void) | |
288 | { | |
2269e89e DG |
289 | int in_tgroup = 0; /* In tracing group */ |
290 | uid_t uid; | |
291 | ||
292 | uid = getuid(); | |
947308c4 | 293 | |
2269e89e DG |
294 | if (uid != 0) { |
295 | /* Are we in the tracing group ? */ | |
296 | in_tgroup = check_tracing_group(tracing_group); | |
297 | } | |
298 | ||
08a9c49f | 299 | if ((uid == 0) || in_tgroup) { |
cac3069d DG |
300 | lttng_ctl_copy_string(sessiond_sock_path, |
301 | DEFAULT_GLOBAL_CLIENT_UNIX_SOCK, sizeof(sessiond_sock_path)); | |
08a9c49f | 302 | } |
2269e89e | 303 | |
08a9c49f | 304 | if (uid != 0) { |
c617c0c6 MD |
305 | int ret; |
306 | ||
08a9c49f TD |
307 | if (in_tgroup) { |
308 | /* Tracing group */ | |
309 | ret = try_connect_sessiond(sessiond_sock_path); | |
310 | if (ret >= 0) { | |
311 | goto end; | |
2269e89e | 312 | } |
08a9c49f | 313 | /* Global session daemon not available... */ |
2269e89e | 314 | } |
08a9c49f TD |
315 | /* ...or not in tracing group (and not root), default */ |
316 | ||
317 | /* | |
318 | * With GNU C < 2.1, snprintf returns -1 if the target buffer is too small; | |
319 | * With GNU C >= 2.1, snprintf returns the required size (excluding closing null) | |
320 | */ | |
321 | ret = snprintf(sessiond_sock_path, sizeof(sessiond_sock_path), | |
feb0f3e5 | 322 | DEFAULT_HOME_CLIENT_UNIX_SOCK, utils_get_home_dir()); |
08a9c49f | 323 | if ((ret < 0) || (ret >= sizeof(sessiond_sock_path))) { |
2f70b271 | 324 | goto error; |
947308c4 | 325 | } |
947308c4 | 326 | } |
08a9c49f | 327 | end: |
947308c4 | 328 | return 0; |
2f70b271 DG |
329 | |
330 | error: | |
331 | return -1; | |
947308c4 DG |
332 | } |
333 | ||
65beb5ff DG |
334 | /* |
335 | * Connect to the LTTng session daemon. | |
336 | * | |
337 | * On success, return 0. On error, return -1. | |
338 | */ | |
339 | static int connect_sessiond(void) | |
340 | { | |
341 | int ret; | |
342 | ||
da3c9ec1 DG |
343 | /* Don't try to connect if already connected. */ |
344 | if (connected) { | |
345 | return 0; | |
346 | } | |
347 | ||
65beb5ff DG |
348 | ret = set_session_daemon_path(); |
349 | if (ret < 0) { | |
2f70b271 | 350 | goto error; |
65beb5ff DG |
351 | } |
352 | ||
353 | /* Connect to the sesssion daemon */ | |
354 | ret = lttcomm_connect_unix_sock(sessiond_sock_path); | |
355 | if (ret < 0) { | |
2f70b271 | 356 | goto error; |
65beb5ff DG |
357 | } |
358 | ||
359 | sessiond_socket = ret; | |
360 | connected = 1; | |
361 | ||
362 | return 0; | |
2f70b271 DG |
363 | |
364 | error: | |
365 | return -1; | |
65beb5ff DG |
366 | } |
367 | ||
368 | /* | |
1c8d13c8 TD |
369 | * Clean disconnect from the session daemon. |
370 | * On success, return 0. On error, return -1. | |
65beb5ff DG |
371 | */ |
372 | static int disconnect_sessiond(void) | |
373 | { | |
374 | int ret = 0; | |
375 | ||
376 | if (connected) { | |
377 | ret = lttcomm_close_unix_sock(sessiond_socket); | |
378 | sessiond_socket = 0; | |
379 | connected = 0; | |
380 | } | |
381 | ||
382 | return ret; | |
383 | } | |
384 | ||
35a6fdb7 | 385 | /* |
cd80958d | 386 | * Ask the session daemon a specific command and put the data into buf. |
53a80697 | 387 | * Takes extra var. len. data as input to send to the session daemon. |
65beb5ff | 388 | * |
af87c45a | 389 | * Return size of data (only payload, not header) or a negative error code. |
65beb5ff | 390 | */ |
cac3069d DG |
391 | LTTNG_HIDDEN |
392 | int lttng_ctl_ask_sessiond_varlen(struct lttcomm_session_msg *lsm, | |
a4b92340 | 393 | void *vardata, size_t varlen, void **buf) |
65beb5ff DG |
394 | { |
395 | int ret; | |
396 | size_t size; | |
397 | void *data = NULL; | |
cd80958d | 398 | struct lttcomm_lttng_msg llm; |
65beb5ff DG |
399 | |
400 | ret = connect_sessiond(); | |
401 | if (ret < 0) { | |
2f70b271 | 402 | ret = -LTTNG_ERR_NO_SESSIOND; |
65beb5ff DG |
403 | goto end; |
404 | } | |
405 | ||
65beb5ff | 406 | /* Send command to session daemon */ |
cd80958d | 407 | ret = send_session_msg(lsm); |
65beb5ff | 408 | if (ret < 0) { |
2f70b271 | 409 | /* Ret value is a valid lttng error code. */ |
65beb5ff DG |
410 | goto end; |
411 | } | |
53a80697 MD |
412 | /* Send var len data */ |
413 | ret = send_session_varlen(vardata, varlen); | |
414 | if (ret < 0) { | |
2f70b271 | 415 | /* Ret value is a valid lttng error code. */ |
53a80697 MD |
416 | goto end; |
417 | } | |
65beb5ff DG |
418 | |
419 | /* Get header from data transmission */ | |
420 | ret = recv_data_sessiond(&llm, sizeof(llm)); | |
421 | if (ret < 0) { | |
2f70b271 | 422 | /* Ret value is a valid lttng error code. */ |
65beb5ff DG |
423 | goto end; |
424 | } | |
425 | ||
426 | /* Check error code if OK */ | |
f73fabfd | 427 | if (llm.ret_code != LTTNG_OK) { |
65beb5ff DG |
428 | ret = -llm.ret_code; |
429 | goto end; | |
430 | } | |
431 | ||
432 | size = llm.data_size; | |
433 | if (size == 0) { | |
874d3f84 | 434 | /* If client free with size 0 */ |
a45d5536 DG |
435 | if (buf != NULL) { |
436 | *buf = NULL; | |
437 | } | |
7d29a247 | 438 | ret = 0; |
65beb5ff DG |
439 | goto end; |
440 | } | |
441 | ||
442 | data = (void*) malloc(size); | |
443 | ||
444 | /* Get payload data */ | |
445 | ret = recv_data_sessiond(data, size); | |
446 | if (ret < 0) { | |
447 | free(data); | |
448 | goto end; | |
449 | } | |
450 | ||
83009e5e DG |
451 | /* |
452 | * Extra protection not to dereference a NULL pointer. If buf is NULL at | |
453 | * this point, an error is returned and data is freed. | |
454 | */ | |
455 | if (buf == NULL) { | |
2f70b271 | 456 | ret = -LTTNG_ERR_INVALID; |
83009e5e DG |
457 | free(data); |
458 | goto end; | |
459 | } | |
460 | ||
65beb5ff DG |
461 | *buf = data; |
462 | ret = size; | |
463 | ||
464 | end: | |
465 | disconnect_sessiond(); | |
466 | return ret; | |
467 | } | |
468 | ||
9f19cc17 | 469 | /* |
cd80958d | 470 | * Create lttng handle and return pointer. |
1c8d13c8 | 471 | * The returned pointer will be NULL in case of malloc() error. |
9f19cc17 | 472 | */ |
cd80958d DG |
473 | struct lttng_handle *lttng_create_handle(const char *session_name, |
474 | struct lttng_domain *domain) | |
9f19cc17 | 475 | { |
2f70b271 DG |
476 | struct lttng_handle *handle = NULL; |
477 | ||
478 | if (domain == NULL) { | |
479 | goto end; | |
480 | } | |
cd80958d DG |
481 | |
482 | handle = malloc(sizeof(struct lttng_handle)); | |
483 | if (handle == NULL) { | |
2f70b271 | 484 | PERROR("malloc handle"); |
cd80958d DG |
485 | goto end; |
486 | } | |
487 | ||
488 | /* Copy session name */ | |
cac3069d | 489 | lttng_ctl_copy_string(handle->session_name, session_name, |
cd80958d DG |
490 | sizeof(handle->session_name)); |
491 | ||
492 | /* Copy lttng domain */ | |
cac3069d | 493 | lttng_ctl_copy_lttng_domain(&handle->domain, domain); |
cd80958d DG |
494 | |
495 | end: | |
496 | return handle; | |
497 | } | |
498 | ||
499 | /* | |
500 | * Destroy handle by free(3) the pointer. | |
501 | */ | |
502 | void lttng_destroy_handle(struct lttng_handle *handle) | |
503 | { | |
0e428499 | 504 | free(handle); |
eb354453 DG |
505 | } |
506 | ||
d9800920 DG |
507 | /* |
508 | * Register an outside consumer. | |
1c8d13c8 | 509 | * Returns size of returned session payload data or a negative error code. |
d9800920 DG |
510 | */ |
511 | int lttng_register_consumer(struct lttng_handle *handle, | |
512 | const char *socket_path) | |
513 | { | |
514 | struct lttcomm_session_msg lsm; | |
515 | ||
2f70b271 DG |
516 | if (handle == NULL || socket_path == NULL) { |
517 | return -LTTNG_ERR_INVALID; | |
518 | } | |
519 | ||
d9800920 | 520 | lsm.cmd_type = LTTNG_REGISTER_CONSUMER; |
cac3069d | 521 | lttng_ctl_copy_string(lsm.session.name, handle->session_name, |
d9800920 | 522 | sizeof(lsm.session.name)); |
cac3069d | 523 | lttng_ctl_copy_lttng_domain(&lsm.domain, &handle->domain); |
d9800920 | 524 | |
cac3069d | 525 | lttng_ctl_copy_string(lsm.u.reg.path, socket_path, sizeof(lsm.u.reg.path)); |
d9800920 | 526 | |
cac3069d | 527 | return lttng_ctl_ask_sessiond(&lsm, NULL); |
d9800920 DG |
528 | } |
529 | ||
1df4dedd | 530 | /* |
1c8d13c8 TD |
531 | * Start tracing for all traces of the session. |
532 | * Returns size of returned session payload data or a negative error code. | |
1df4dedd | 533 | */ |
6a4f824d | 534 | int lttng_start_tracing(const char *session_name) |
f3ed775e | 535 | { |
cd80958d DG |
536 | struct lttcomm_session_msg lsm; |
537 | ||
6a4f824d | 538 | if (session_name == NULL) { |
2f70b271 | 539 | return -LTTNG_ERR_INVALID; |
cd80958d DG |
540 | } |
541 | ||
542 | lsm.cmd_type = LTTNG_START_TRACE; | |
6a4f824d | 543 | |
cac3069d DG |
544 | lttng_ctl_copy_string(lsm.session.name, session_name, |
545 | sizeof(lsm.session.name)); | |
cd80958d | 546 | |
cac3069d | 547 | return lttng_ctl_ask_sessiond(&lsm, NULL); |
f3ed775e | 548 | } |
1df4dedd DG |
549 | |
550 | /* | |
38ee087f | 551 | * Stop tracing for all traces of the session. |
f3ed775e | 552 | */ |
38ee087f | 553 | static int _lttng_stop_tracing(const char *session_name, int wait) |
f3ed775e | 554 | { |
38ee087f | 555 | int ret, data_ret; |
cd80958d DG |
556 | struct lttcomm_session_msg lsm; |
557 | ||
6a4f824d | 558 | if (session_name == NULL) { |
2f70b271 | 559 | return -LTTNG_ERR_INVALID; |
6a4f824d DG |
560 | } |
561 | ||
cd80958d | 562 | lsm.cmd_type = LTTNG_STOP_TRACE; |
6a4f824d | 563 | |
cac3069d DG |
564 | lttng_ctl_copy_string(lsm.session.name, session_name, |
565 | sizeof(lsm.session.name)); | |
cd80958d | 566 | |
cac3069d | 567 | ret = lttng_ctl_ask_sessiond(&lsm, NULL); |
38ee087f DG |
568 | if (ret < 0 && ret != -LTTNG_ERR_TRACE_ALREADY_STOPPED) { |
569 | goto error; | |
570 | } | |
571 | ||
572 | if (!wait) { | |
573 | goto end; | |
574 | } | |
575 | ||
576 | _MSG("Waiting for data availability"); | |
577 | ||
578 | /* Check for data availability */ | |
579 | do { | |
6d805429 | 580 | data_ret = lttng_data_pending(session_name); |
38ee087f DG |
581 | if (data_ret < 0) { |
582 | /* Return the data available call error. */ | |
583 | ret = data_ret; | |
584 | goto error; | |
585 | } | |
586 | ||
587 | /* | |
588 | * Data sleep time before retrying (in usec). Don't sleep if the call | |
589 | * returned value indicates availability. | |
590 | */ | |
6d805429 | 591 | if (data_ret) { |
38ee087f DG |
592 | usleep(DEFAULT_DATA_AVAILABILITY_WAIT_TIME); |
593 | _MSG("."); | |
594 | } | |
6d805429 | 595 | } while (data_ret != 0); |
38ee087f DG |
596 | |
597 | MSG(""); | |
598 | ||
599 | end: | |
600 | error: | |
601 | return ret; | |
602 | } | |
603 | ||
604 | /* | |
605 | * Stop tracing and wait for data availability. | |
606 | */ | |
607 | int lttng_stop_tracing(const char *session_name) | |
608 | { | |
609 | return _lttng_stop_tracing(session_name, 1); | |
610 | } | |
611 | ||
612 | /* | |
613 | * Stop tracing but _don't_ wait for data availability. | |
614 | */ | |
615 | int lttng_stop_tracing_no_wait(const char *session_name) | |
616 | { | |
617 | return _lttng_stop_tracing(session_name, 0); | |
f3ed775e DG |
618 | } |
619 | ||
620 | /* | |
601d5acf DG |
621 | * Add context to a channel. |
622 | * | |
623 | * If the given channel is NULL, add the contexts to all channels. | |
624 | * The event_name param is ignored. | |
af87c45a DG |
625 | * |
626 | * Returns the size of the returned payload data or a negative error code. | |
1df4dedd | 627 | */ |
cd80958d | 628 | int lttng_add_context(struct lttng_handle *handle, |
38057ed1 DG |
629 | struct lttng_event_context *ctx, const char *event_name, |
630 | const char *channel_name) | |
d65106b1 | 631 | { |
cd80958d DG |
632 | struct lttcomm_session_msg lsm; |
633 | ||
9d697d3d DG |
634 | /* Safety check. Both are mandatory */ |
635 | if (handle == NULL || ctx == NULL) { | |
2f70b271 | 636 | return -LTTNG_ERR_INVALID; |
cd80958d DG |
637 | } |
638 | ||
441c16a7 MD |
639 | memset(&lsm, 0, sizeof(lsm)); |
640 | ||
cd80958d DG |
641 | lsm.cmd_type = LTTNG_ADD_CONTEXT; |
642 | ||
85076754 MD |
643 | /* If no channel name, send empty string. */ |
644 | if (channel_name == NULL) { | |
645 | lttng_ctl_copy_string(lsm.u.context.channel_name, "", | |
646 | sizeof(lsm.u.context.channel_name)); | |
647 | } else { | |
648 | lttng_ctl_copy_string(lsm.u.context.channel_name, channel_name, | |
649 | sizeof(lsm.u.context.channel_name)); | |
650 | } | |
cd80958d | 651 | |
cac3069d | 652 | lttng_ctl_copy_lttng_domain(&lsm.domain, &handle->domain); |
d65106b1 | 653 | |
9d697d3d | 654 | memcpy(&lsm.u.context.ctx, ctx, sizeof(struct lttng_event_context)); |
d65106b1 | 655 | |
cac3069d | 656 | lttng_ctl_copy_string(lsm.session.name, handle->session_name, |
cd80958d DG |
657 | sizeof(lsm.session.name)); |
658 | ||
cac3069d | 659 | return lttng_ctl_ask_sessiond(&lsm, NULL); |
d65106b1 DG |
660 | } |
661 | ||
f3ed775e | 662 | /* |
1c8d13c8 TD |
663 | * Enable event(s) for a channel. |
664 | * If no event name is specified, all events are enabled. | |
665 | * If no channel name is specified, the default 'channel0' is used. | |
666 | * Returns size of returned session payload data or a negative error code. | |
f3ed775e | 667 | */ |
cd80958d | 668 | int lttng_enable_event(struct lttng_handle *handle, |
38057ed1 | 669 | struct lttng_event *ev, const char *channel_name) |
1df4dedd | 670 | { |
cd80958d DG |
671 | struct lttcomm_session_msg lsm; |
672 | ||
5117eeec | 673 | if (handle == NULL || ev == NULL) { |
2f70b271 | 674 | return -LTTNG_ERR_INVALID; |
cd80958d | 675 | } |
33a2b854 | 676 | |
441c16a7 MD |
677 | memset(&lsm, 0, sizeof(lsm)); |
678 | ||
85076754 | 679 | /* If no channel name, send empty string. */ |
94cf3c47 | 680 | if (channel_name == NULL) { |
85076754 | 681 | lttng_ctl_copy_string(lsm.u.enable.channel_name, "", |
cd80958d | 682 | sizeof(lsm.u.enable.channel_name)); |
33a2b854 | 683 | } else { |
cac3069d | 684 | lttng_ctl_copy_string(lsm.u.enable.channel_name, channel_name, |
cd80958d | 685 | sizeof(lsm.u.enable.channel_name)); |
eb354453 DG |
686 | } |
687 | ||
cac3069d | 688 | lttng_ctl_copy_lttng_domain(&lsm.domain, &handle->domain); |
0d0c377a | 689 | |
8c9ae521 | 690 | if (ev->name[0] != '\0') { |
cd80958d | 691 | lsm.cmd_type = LTTNG_ENABLE_EVENT; |
0d0c377a | 692 | } else { |
cd80958d | 693 | lsm.cmd_type = LTTNG_ENABLE_ALL_EVENT; |
f3ed775e | 694 | } |
8c9ae521 | 695 | memcpy(&lsm.u.enable.event, ev, sizeof(lsm.u.enable.event)); |
f3ed775e | 696 | |
cac3069d | 697 | lttng_ctl_copy_string(lsm.session.name, handle->session_name, |
cd80958d DG |
698 | sizeof(lsm.session.name)); |
699 | ||
cac3069d | 700 | return lttng_ctl_ask_sessiond(&lsm, NULL); |
1df4dedd DG |
701 | } |
702 | ||
53a80697 | 703 | /* |
025faf73 | 704 | * Create or enable an event with a filter expression. |
178191b3 | 705 | * |
53a80697 MD |
706 | * Return negative error value on error. |
707 | * Return size of returned session payload data if OK. | |
708 | */ | |
025faf73 | 709 | int lttng_enable_event_with_filter(struct lttng_handle *handle, |
178191b3 | 710 | struct lttng_event *event, const char *channel_name, |
53a80697 MD |
711 | const char *filter_expression) |
712 | { | |
713 | struct lttcomm_session_msg lsm; | |
714 | struct filter_parser_ctx *ctx; | |
715 | FILE *fmem; | |
716 | int ret = 0; | |
717 | ||
52df2401 MD |
718 | if (!filter_expression) { |
719 | /* | |
720 | * Fall back to normal event enabling if no filter | |
721 | * specified. | |
722 | */ | |
723 | return lttng_enable_event(handle, event, channel_name); | |
724 | } | |
725 | ||
726 | /* | |
727 | * Empty filter string will always be rejected by the parser | |
728 | * anyway, so treat this corner-case early to eliminate | |
729 | * lttng_fmemopen error for 0-byte allocation. | |
730 | */ | |
731 | if (handle == NULL || filter_expression[0] == '\0') { | |
2f70b271 | 732 | return -LTTNG_ERR_INVALID; |
53a80697 MD |
733 | } |
734 | ||
53a80697 MD |
735 | /* |
736 | * casting const to non-const, as the underlying function will | |
737 | * use it in read-only mode. | |
738 | */ | |
739 | fmem = lttng_fmemopen((void *) filter_expression, | |
740 | strlen(filter_expression), "r"); | |
741 | if (!fmem) { | |
742 | fprintf(stderr, "Error opening memory as stream\n"); | |
ff7ef7b8 | 743 | return -LTTNG_ERR_FILTER_NOMEM; |
53a80697 MD |
744 | } |
745 | ctx = filter_parser_ctx_alloc(fmem); | |
746 | if (!ctx) { | |
747 | fprintf(stderr, "Error allocating parser\n"); | |
ff7ef7b8 | 748 | ret = -LTTNG_ERR_FILTER_NOMEM; |
53a80697 MD |
749 | goto alloc_error; |
750 | } | |
751 | ret = filter_parser_ctx_append_ast(ctx); | |
752 | if (ret) { | |
753 | fprintf(stderr, "Parse error\n"); | |
ff7ef7b8 | 754 | ret = -LTTNG_ERR_FILTER_INVAL; |
53a80697 MD |
755 | goto parse_error; |
756 | } | |
757 | ret = filter_visitor_set_parent(ctx); | |
758 | if (ret) { | |
759 | fprintf(stderr, "Set parent error\n"); | |
ff7ef7b8 | 760 | ret = -LTTNG_ERR_FILTER_INVAL; |
53a80697 MD |
761 | goto parse_error; |
762 | } | |
763 | if (print_xml) { | |
764 | ret = filter_visitor_print_xml(ctx, stdout, 0); | |
765 | if (ret) { | |
766 | fflush(stdout); | |
767 | fprintf(stderr, "XML print error\n"); | |
ff7ef7b8 | 768 | ret = -LTTNG_ERR_FILTER_INVAL; |
53a80697 MD |
769 | goto parse_error; |
770 | } | |
771 | } | |
772 | ||
773 | dbg_printf("Generating IR... "); | |
774 | fflush(stdout); | |
775 | ret = filter_visitor_ir_generate(ctx); | |
776 | if (ret) { | |
777 | fprintf(stderr, "Generate IR error\n"); | |
ff7ef7b8 | 778 | ret = -LTTNG_ERR_FILTER_INVAL; |
53a80697 MD |
779 | goto parse_error; |
780 | } | |
781 | dbg_printf("done\n"); | |
782 | ||
783 | dbg_printf("Validating IR... "); | |
784 | fflush(stdout); | |
785 | ret = filter_visitor_ir_check_binary_op_nesting(ctx); | |
786 | if (ret) { | |
ff7ef7b8 | 787 | ret = -LTTNG_ERR_FILTER_INVAL; |
53a80697 MD |
788 | goto parse_error; |
789 | } | |
790 | dbg_printf("done\n"); | |
791 | ||
792 | dbg_printf("Generating bytecode... "); | |
793 | fflush(stdout); | |
794 | ret = filter_visitor_bytecode_generate(ctx); | |
795 | if (ret) { | |
796 | fprintf(stderr, "Generate bytecode error\n"); | |
ff7ef7b8 | 797 | ret = -LTTNG_ERR_FILTER_INVAL; |
53a80697 MD |
798 | goto parse_error; |
799 | } | |
800 | dbg_printf("done\n"); | |
801 | dbg_printf("Size of bytecode generated: %u bytes.\n", | |
802 | bytecode_get_len(&ctx->bytecode->b)); | |
803 | ||
804 | memset(&lsm, 0, sizeof(lsm)); | |
805 | ||
025faf73 | 806 | lsm.cmd_type = LTTNG_ENABLE_EVENT_WITH_FILTER; |
53a80697 | 807 | |
85076754 MD |
808 | /* If no channel name, send empty string. */ |
809 | if (channel_name == NULL) { | |
810 | lttng_ctl_copy_string(lsm.u.enable.channel_name, "", | |
811 | sizeof(lsm.u.enable.channel_name)); | |
812 | } else { | |
813 | lttng_ctl_copy_string(lsm.u.enable.channel_name, channel_name, | |
814 | sizeof(lsm.u.enable.channel_name)); | |
815 | } | |
816 | ||
53a80697 | 817 | /* Copy event name */ |
178191b3 DG |
818 | if (event) { |
819 | memcpy(&lsm.u.enable.event, event, sizeof(lsm.u.enable.event)); | |
820 | } | |
821 | ||
025faf73 | 822 | lsm.u.enable.bytecode_len = sizeof(ctx->bytecode->b) |
53a80697 MD |
823 | + bytecode_get_len(&ctx->bytecode->b); |
824 | ||
cac3069d | 825 | lttng_ctl_copy_lttng_domain(&lsm.domain, &handle->domain); |
53a80697 | 826 | |
cac3069d | 827 | lttng_ctl_copy_string(lsm.session.name, handle->session_name, |
53a80697 MD |
828 | sizeof(lsm.session.name)); |
829 | ||
cac3069d | 830 | ret = lttng_ctl_ask_sessiond_varlen(&lsm, &ctx->bytecode->b, |
025faf73 | 831 | lsm.u.enable.bytecode_len, NULL); |
53a80697 MD |
832 | |
833 | filter_bytecode_free(ctx); | |
834 | filter_ir_free(ctx); | |
835 | filter_parser_ctx_free(ctx); | |
836 | if (fclose(fmem) != 0) { | |
837 | perror("fclose"); | |
838 | } | |
839 | return ret; | |
840 | ||
841 | parse_error: | |
842 | filter_bytecode_free(ctx); | |
843 | filter_ir_free(ctx); | |
844 | filter_parser_ctx_free(ctx); | |
845 | alloc_error: | |
846 | if (fclose(fmem) != 0) { | |
847 | perror("fclose"); | |
848 | } | |
849 | return ret; | |
850 | } | |
851 | ||
1df4dedd | 852 | /* |
1c8d13c8 TD |
853 | * Disable event(s) of a channel and domain. |
854 | * If no event name is specified, all events are disabled. | |
855 | * If no channel name is specified, the default 'channel0' is used. | |
856 | * Returns size of returned session payload data or a negative error code. | |
1df4dedd | 857 | */ |
cd80958d | 858 | int lttng_disable_event(struct lttng_handle *handle, const char *name, |
38057ed1 | 859 | const char *channel_name) |
1df4dedd | 860 | { |
cd80958d | 861 | struct lttcomm_session_msg lsm; |
1df4dedd | 862 | |
9d697d3d | 863 | if (handle == NULL) { |
2f70b271 | 864 | return -LTTNG_ERR_INVALID; |
cd80958d DG |
865 | } |
866 | ||
441c16a7 MD |
867 | memset(&lsm, 0, sizeof(lsm)); |
868 | ||
85076754 MD |
869 | /* If no channel name, send empty string. */ |
870 | if (channel_name == NULL) { | |
871 | lttng_ctl_copy_string(lsm.u.disable.channel_name, "", | |
cd80958d | 872 | sizeof(lsm.u.disable.channel_name)); |
f3ed775e | 873 | } else { |
85076754 | 874 | lttng_ctl_copy_string(lsm.u.disable.channel_name, channel_name, |
cd80958d | 875 | sizeof(lsm.u.disable.channel_name)); |
eb354453 DG |
876 | } |
877 | ||
cac3069d | 878 | lttng_ctl_copy_lttng_domain(&lsm.domain, &handle->domain); |
f5177a38 | 879 | |
f84efadf | 880 | if (name != NULL) { |
cac3069d DG |
881 | lttng_ctl_copy_string(lsm.u.disable.name, name, |
882 | sizeof(lsm.u.disable.name)); | |
cd80958d | 883 | lsm.cmd_type = LTTNG_DISABLE_EVENT; |
f5177a38 | 884 | } else { |
cd80958d | 885 | lsm.cmd_type = LTTNG_DISABLE_ALL_EVENT; |
f3ed775e DG |
886 | } |
887 | ||
cac3069d | 888 | lttng_ctl_copy_string(lsm.session.name, handle->session_name, |
cd80958d DG |
889 | sizeof(lsm.session.name)); |
890 | ||
cac3069d | 891 | return lttng_ctl_ask_sessiond(&lsm, NULL); |
1df4dedd DG |
892 | } |
893 | ||
894 | /* | |
1c8d13c8 TD |
895 | * Enable channel per domain |
896 | * Returns size of returned session payload data or a negative error code. | |
a5c5a2bd | 897 | */ |
cd80958d | 898 | int lttng_enable_channel(struct lttng_handle *handle, |
38057ed1 | 899 | struct lttng_channel *chan) |
a5c5a2bd | 900 | { |
cd80958d DG |
901 | struct lttcomm_session_msg lsm; |
902 | ||
5117eeec DG |
903 | /* |
904 | * NULL arguments are forbidden. No default values. | |
905 | */ | |
906 | if (handle == NULL || chan == NULL) { | |
2f70b271 | 907 | return -LTTNG_ERR_INVALID; |
cd80958d DG |
908 | } |
909 | ||
441c16a7 MD |
910 | memset(&lsm, 0, sizeof(lsm)); |
911 | ||
5117eeec | 912 | memcpy(&lsm.u.channel.chan, chan, sizeof(lsm.u.channel.chan)); |
7d29a247 | 913 | |
cd80958d DG |
914 | lsm.cmd_type = LTTNG_ENABLE_CHANNEL; |
915 | ||
cac3069d | 916 | lttng_ctl_copy_lttng_domain(&lsm.domain, &handle->domain); |
7d29a247 | 917 | |
cac3069d | 918 | lttng_ctl_copy_string(lsm.session.name, handle->session_name, |
cd80958d DG |
919 | sizeof(lsm.session.name)); |
920 | ||
cac3069d | 921 | return lttng_ctl_ask_sessiond(&lsm, NULL); |
8c0faa1d | 922 | } |
1df4dedd | 923 | |
2ef84c95 | 924 | /* |
1c8d13c8 TD |
925 | * All tracing will be stopped for registered events of the channel. |
926 | * Returns size of returned session payload data or a negative error code. | |
2ef84c95 | 927 | */ |
cd80958d | 928 | int lttng_disable_channel(struct lttng_handle *handle, const char *name) |
2ef84c95 | 929 | { |
cd80958d DG |
930 | struct lttcomm_session_msg lsm; |
931 | ||
9d697d3d DG |
932 | /* Safety check. Both are mandatory */ |
933 | if (handle == NULL || name == NULL) { | |
2f70b271 | 934 | return -LTTNG_ERR_INVALID; |
cd80958d DG |
935 | } |
936 | ||
441c16a7 MD |
937 | memset(&lsm, 0, sizeof(lsm)); |
938 | ||
cd80958d | 939 | lsm.cmd_type = LTTNG_DISABLE_CHANNEL; |
1df4dedd | 940 | |
cac3069d | 941 | lttng_ctl_copy_string(lsm.u.disable.channel_name, name, |
9d697d3d DG |
942 | sizeof(lsm.u.disable.channel_name)); |
943 | ||
cac3069d | 944 | lttng_ctl_copy_lttng_domain(&lsm.domain, &handle->domain); |
cd80958d | 945 | |
cac3069d | 946 | lttng_ctl_copy_string(lsm.session.name, handle->session_name, |
cd80958d DG |
947 | sizeof(lsm.session.name)); |
948 | ||
cac3069d | 949 | return lttng_ctl_ask_sessiond(&lsm, NULL); |
ca95a216 DG |
950 | } |
951 | ||
fac6795d | 952 | /* |
1c8d13c8 TD |
953 | * Lists all available tracepoints of domain. |
954 | * Sets the contents of the events array. | |
955 | * Returns the number of lttng_event entries in events; | |
956 | * on error, returns a negative value. | |
fac6795d | 957 | */ |
cd80958d | 958 | int lttng_list_tracepoints(struct lttng_handle *handle, |
2a71efd5 | 959 | struct lttng_event **events) |
fac6795d | 960 | { |
052da939 | 961 | int ret; |
cd80958d DG |
962 | struct lttcomm_session_msg lsm; |
963 | ||
9d697d3d | 964 | if (handle == NULL) { |
2f70b271 | 965 | return -LTTNG_ERR_INVALID; |
cd80958d | 966 | } |
fac6795d | 967 | |
cd80958d | 968 | lsm.cmd_type = LTTNG_LIST_TRACEPOINTS; |
cac3069d | 969 | lttng_ctl_copy_lttng_domain(&lsm.domain, &handle->domain); |
2a71efd5 | 970 | |
cac3069d | 971 | ret = lttng_ctl_ask_sessiond(&lsm, (void **) events); |
052da939 DG |
972 | if (ret < 0) { |
973 | return ret; | |
eb354453 | 974 | } |
fac6795d | 975 | |
9f19cc17 | 976 | return ret / sizeof(struct lttng_event); |
fac6795d DG |
977 | } |
978 | ||
f37d259d MD |
979 | /* |
980 | * Lists all available tracepoint fields of domain. | |
981 | * Sets the contents of the event field array. | |
982 | * Returns the number of lttng_event_field entries in events; | |
983 | * on error, returns a negative value. | |
984 | */ | |
985 | int lttng_list_tracepoint_fields(struct lttng_handle *handle, | |
986 | struct lttng_event_field **fields) | |
987 | { | |
988 | int ret; | |
989 | struct lttcomm_session_msg lsm; | |
990 | ||
991 | if (handle == NULL) { | |
2f70b271 | 992 | return -LTTNG_ERR_INVALID; |
f37d259d MD |
993 | } |
994 | ||
995 | lsm.cmd_type = LTTNG_LIST_TRACEPOINT_FIELDS; | |
cac3069d | 996 | lttng_ctl_copy_lttng_domain(&lsm.domain, &handle->domain); |
f37d259d | 997 | |
cac3069d | 998 | ret = lttng_ctl_ask_sessiond(&lsm, (void **) fields); |
f37d259d MD |
999 | if (ret < 0) { |
1000 | return ret; | |
1001 | } | |
1002 | ||
1003 | return ret / sizeof(struct lttng_event_field); | |
1004 | } | |
1005 | ||
1657e9bb | 1006 | /* |
1c8d13c8 TD |
1007 | * Returns a human readable string describing |
1008 | * the error code (a negative value). | |
1657e9bb | 1009 | */ |
9a745bc7 | 1010 | const char *lttng_strerror(int code) |
1657e9bb | 1011 | { |
f73fabfd | 1012 | return error_get_str(code); |
1657e9bb DG |
1013 | } |
1014 | ||
aaf97519 | 1015 | /* |
a4b92340 DG |
1016 | * Create a brand new session using name and url for destination. |
1017 | * | |
f73fabfd | 1018 | * Returns LTTNG_OK on success or a negative error code. |
00e2e675 | 1019 | */ |
a4b92340 | 1020 | int lttng_create_session(const char *name, const char *url) |
00e2e675 | 1021 | { |
3dd05a85 | 1022 | int ret; |
a4b92340 | 1023 | ssize_t size; |
00e2e675 | 1024 | struct lttcomm_session_msg lsm; |
a4b92340 | 1025 | struct lttng_uri *uris = NULL; |
00e2e675 | 1026 | |
a4b92340 | 1027 | if (name == NULL) { |
2f70b271 | 1028 | return -LTTNG_ERR_INVALID; |
00e2e675 DG |
1029 | } |
1030 | ||
a4b92340 | 1031 | memset(&lsm, 0, sizeof(lsm)); |
00e2e675 | 1032 | |
a4b92340 | 1033 | lsm.cmd_type = LTTNG_CREATE_SESSION; |
cac3069d | 1034 | lttng_ctl_copy_string(lsm.session.name, name, sizeof(lsm.session.name)); |
a4b92340 DG |
1035 | |
1036 | /* There should never be a data URL */ | |
bc894455 | 1037 | size = uri_parse_str_urls(url, NULL, &uris); |
a4b92340 | 1038 | if (size < 0) { |
2f70b271 | 1039 | return -LTTNG_ERR_INVALID; |
00e2e675 DG |
1040 | } |
1041 | ||
a4b92340 DG |
1042 | lsm.u.uri.size = size; |
1043 | ||
cac3069d DG |
1044 | ret = lttng_ctl_ask_sessiond_varlen(&lsm, uris, |
1045 | sizeof(struct lttng_uri) * size, NULL); | |
3dd05a85 DG |
1046 | |
1047 | free(uris); | |
1048 | return ret; | |
00e2e675 DG |
1049 | } |
1050 | ||
8028d920 | 1051 | /* |
8028d920 | 1052 | * Destroy session using name. |
1c8d13c8 | 1053 | * Returns size of returned session payload data or a negative error code. |
8028d920 | 1054 | */ |
843f5df9 | 1055 | int lttng_destroy_session(const char *session_name) |
8028d920 | 1056 | { |
cd80958d DG |
1057 | struct lttcomm_session_msg lsm; |
1058 | ||
843f5df9 | 1059 | if (session_name == NULL) { |
2f70b271 | 1060 | return -LTTNG_ERR_INVALID; |
cd80958d DG |
1061 | } |
1062 | ||
1063 | lsm.cmd_type = LTTNG_DESTROY_SESSION; | |
843f5df9 | 1064 | |
cac3069d DG |
1065 | lttng_ctl_copy_string(lsm.session.name, session_name, |
1066 | sizeof(lsm.session.name)); | |
cd80958d | 1067 | |
cac3069d | 1068 | return lttng_ctl_ask_sessiond(&lsm, NULL); |
aaf97519 DG |
1069 | } |
1070 | ||
57167058 | 1071 | /* |
57167058 | 1072 | * Ask the session daemon for all available sessions. |
1c8d13c8 TD |
1073 | * Sets the contents of the sessions array. |
1074 | * Returns the number of lttng_session entries in sessions; | |
1075 | * on error, returns a negative value. | |
57167058 | 1076 | */ |
ca95a216 | 1077 | int lttng_list_sessions(struct lttng_session **sessions) |
57167058 | 1078 | { |
ca95a216 | 1079 | int ret; |
cd80958d | 1080 | struct lttcomm_session_msg lsm; |
57167058 | 1081 | |
cd80958d | 1082 | lsm.cmd_type = LTTNG_LIST_SESSIONS; |
cac3069d | 1083 | ret = lttng_ctl_ask_sessiond(&lsm, (void**) sessions); |
57167058 | 1084 | if (ret < 0) { |
ca95a216 | 1085 | return ret; |
57167058 DG |
1086 | } |
1087 | ||
ca95a216 | 1088 | return ret / sizeof(struct lttng_session); |
57167058 DG |
1089 | } |
1090 | ||
9f19cc17 | 1091 | /* |
1c8d13c8 TD |
1092 | * Ask the session daemon for all available domains of a session. |
1093 | * Sets the contents of the domains array. | |
1094 | * Returns the number of lttng_domain entries in domains; | |
1095 | * on error, returns a negative value. | |
9f19cc17 | 1096 | */ |
330be774 | 1097 | int lttng_list_domains(const char *session_name, |
cd80958d | 1098 | struct lttng_domain **domains) |
9f19cc17 DG |
1099 | { |
1100 | int ret; | |
cd80958d DG |
1101 | struct lttcomm_session_msg lsm; |
1102 | ||
330be774 | 1103 | if (session_name == NULL) { |
2f70b271 | 1104 | return -LTTNG_ERR_INVALID; |
cd80958d | 1105 | } |
9f19cc17 | 1106 | |
cd80958d DG |
1107 | lsm.cmd_type = LTTNG_LIST_DOMAINS; |
1108 | ||
cac3069d DG |
1109 | lttng_ctl_copy_string(lsm.session.name, session_name, |
1110 | sizeof(lsm.session.name)); | |
cd80958d | 1111 | |
cac3069d | 1112 | ret = lttng_ctl_ask_sessiond(&lsm, (void**) domains); |
9f19cc17 DG |
1113 | if (ret < 0) { |
1114 | return ret; | |
1115 | } | |
1116 | ||
1117 | return ret / sizeof(struct lttng_domain); | |
1118 | } | |
1119 | ||
1120 | /* | |
1c8d13c8 TD |
1121 | * Ask the session daemon for all available channels of a session. |
1122 | * Sets the contents of the channels array. | |
1123 | * Returns the number of lttng_channel entries in channels; | |
1124 | * on error, returns a negative value. | |
9f19cc17 | 1125 | */ |
cd80958d DG |
1126 | int lttng_list_channels(struct lttng_handle *handle, |
1127 | struct lttng_channel **channels) | |
9f19cc17 DG |
1128 | { |
1129 | int ret; | |
cd80958d DG |
1130 | struct lttcomm_session_msg lsm; |
1131 | ||
9d697d3d | 1132 | if (handle == NULL) { |
2f70b271 | 1133 | return -LTTNG_ERR_INVALID; |
cd80958d DG |
1134 | } |
1135 | ||
1136 | lsm.cmd_type = LTTNG_LIST_CHANNELS; | |
cac3069d | 1137 | lttng_ctl_copy_string(lsm.session.name, handle->session_name, |
cd80958d | 1138 | sizeof(lsm.session.name)); |
9f19cc17 | 1139 | |
cac3069d | 1140 | lttng_ctl_copy_lttng_domain(&lsm.domain, &handle->domain); |
9f19cc17 | 1141 | |
cac3069d | 1142 | ret = lttng_ctl_ask_sessiond(&lsm, (void**) channels); |
9f19cc17 DG |
1143 | if (ret < 0) { |
1144 | return ret; | |
1145 | } | |
1146 | ||
1147 | return ret / sizeof(struct lttng_channel); | |
1148 | } | |
1149 | ||
1150 | /* | |
1c8d13c8 TD |
1151 | * Ask the session daemon for all available events of a session channel. |
1152 | * Sets the contents of the events array. | |
1153 | * Returns the number of lttng_event entries in events; | |
1154 | * on error, returns a negative value. | |
9f19cc17 | 1155 | */ |
cd80958d DG |
1156 | int lttng_list_events(struct lttng_handle *handle, |
1157 | const char *channel_name, struct lttng_event **events) | |
9f19cc17 DG |
1158 | { |
1159 | int ret; | |
cd80958d | 1160 | struct lttcomm_session_msg lsm; |
9f19cc17 | 1161 | |
9d697d3d DG |
1162 | /* Safety check. An handle and channel name are mandatory */ |
1163 | if (handle == NULL || channel_name == NULL) { | |
2f70b271 | 1164 | return -LTTNG_ERR_INVALID; |
cd80958d DG |
1165 | } |
1166 | ||
1167 | lsm.cmd_type = LTTNG_LIST_EVENTS; | |
cac3069d | 1168 | lttng_ctl_copy_string(lsm.session.name, handle->session_name, |
cd80958d | 1169 | sizeof(lsm.session.name)); |
cac3069d | 1170 | lttng_ctl_copy_string(lsm.u.list.channel_name, channel_name, |
cd80958d DG |
1171 | sizeof(lsm.u.list.channel_name)); |
1172 | ||
cac3069d | 1173 | lttng_ctl_copy_lttng_domain(&lsm.domain, &handle->domain); |
9f19cc17 | 1174 | |
cac3069d | 1175 | ret = lttng_ctl_ask_sessiond(&lsm, (void**) events); |
9f19cc17 DG |
1176 | if (ret < 0) { |
1177 | return ret; | |
1178 | } | |
1179 | ||
1180 | return ret / sizeof(struct lttng_event); | |
1181 | } | |
1182 | ||
fac6795d | 1183 | /* |
1c8d13c8 TD |
1184 | * Sets the tracing_group variable with name. |
1185 | * This function allocates memory pointed to by tracing_group. | |
1186 | * On success, returns 0, on error, returns -1 (null name) or -ENOMEM. | |
fac6795d DG |
1187 | */ |
1188 | int lttng_set_tracing_group(const char *name) | |
1189 | { | |
9d697d3d | 1190 | if (name == NULL) { |
2f70b271 | 1191 | return -LTTNG_ERR_INVALID; |
9d697d3d DG |
1192 | } |
1193 | ||
fac6795d | 1194 | if (asprintf(&tracing_group, "%s", name) < 0) { |
2f70b271 | 1195 | return -LTTNG_ERR_FATAL; |
fac6795d DG |
1196 | } |
1197 | ||
1198 | return 0; | |
1199 | } | |
1200 | ||
d0254c7c | 1201 | /* |
af87c45a | 1202 | * Returns size of returned session payload data or a negative error code. |
d0254c7c | 1203 | */ |
cd80958d | 1204 | int lttng_calibrate(struct lttng_handle *handle, |
d0254c7c MD |
1205 | struct lttng_calibrate *calibrate) |
1206 | { | |
cd80958d | 1207 | struct lttcomm_session_msg lsm; |
d0254c7c | 1208 | |
9d697d3d DG |
1209 | /* Safety check. NULL pointer are forbidden */ |
1210 | if (handle == NULL || calibrate == NULL) { | |
2f70b271 | 1211 | return -LTTNG_ERR_INVALID; |
cd80958d | 1212 | } |
d0254c7c | 1213 | |
cd80958d | 1214 | lsm.cmd_type = LTTNG_CALIBRATE; |
cac3069d | 1215 | lttng_ctl_copy_lttng_domain(&lsm.domain, &handle->domain); |
d0254c7c | 1216 | |
cd80958d DG |
1217 | memcpy(&lsm.u.calibrate, calibrate, sizeof(lsm.u.calibrate)); |
1218 | ||
cac3069d | 1219 | return lttng_ctl_ask_sessiond(&lsm, NULL); |
d0254c7c MD |
1220 | } |
1221 | ||
5edd7e09 DG |
1222 | /* |
1223 | * Set default channel attributes. | |
441c16a7 | 1224 | * If either or both of the arguments are null, attr content is zeroe'd. |
5edd7e09 DG |
1225 | */ |
1226 | void lttng_channel_set_default_attr(struct lttng_domain *domain, | |
1227 | struct lttng_channel_attr *attr) | |
1228 | { | |
1229 | /* Safety check */ | |
1230 | if (attr == NULL || domain == NULL) { | |
1231 | return; | |
1232 | } | |
1233 | ||
eacaa7a6 DS |
1234 | memset(attr, 0, sizeof(struct lttng_channel_attr)); |
1235 | ||
0a9c6494 DG |
1236 | /* Same for all domains. */ |
1237 | attr->overwrite = DEFAULT_CHANNEL_OVERWRITE; | |
1238 | attr->tracefile_size = DEFAULT_CHANNEL_TRACEFILE_SIZE; | |
1239 | attr->tracefile_count = DEFAULT_CHANNEL_TRACEFILE_COUNT; | |
1240 | ||
5edd7e09 DG |
1241 | switch (domain->type) { |
1242 | case LTTNG_DOMAIN_KERNEL: | |
d92ff3ef DG |
1243 | attr->switch_timer_interval = DEFAULT_KERNEL_CHANNEL_SWITCH_TIMER; |
1244 | attr->read_timer_interval = DEFAULT_KERNEL_CHANNEL_READ_TIMER; | |
3e230f92 | 1245 | attr->subbuf_size = default_get_kernel_channel_subbuf_size(); |
5edd7e09 DG |
1246 | attr->num_subbuf = DEFAULT_KERNEL_CHANNEL_SUBBUF_NUM; |
1247 | attr->output = DEFAULT_KERNEL_CHANNEL_OUTPUT; | |
1248 | break; | |
1249 | case LTTNG_DOMAIN_UST: | |
0a9c6494 DG |
1250 | switch (domain->buf_type) { |
1251 | case LTTNG_BUFFER_PER_UID: | |
1252 | attr->subbuf_size = default_get_ust_uid_channel_subbuf_size(); | |
1253 | attr->num_subbuf = DEFAULT_UST_UID_CHANNEL_SUBBUF_NUM; | |
1254 | attr->output = DEFAULT_UST_UID_CHANNEL_OUTPUT; | |
1255 | attr->switch_timer_interval = DEFAULT_UST_UID_CHANNEL_SWITCH_TIMER; | |
1256 | attr->read_timer_interval = DEFAULT_UST_UID_CHANNEL_READ_TIMER; | |
1257 | break; | |
1258 | case LTTNG_BUFFER_PER_PID: | |
1259 | default: | |
1260 | attr->subbuf_size = default_get_ust_pid_channel_subbuf_size(); | |
1261 | attr->num_subbuf = DEFAULT_UST_PID_CHANNEL_SUBBUF_NUM; | |
1262 | attr->output = DEFAULT_UST_PID_CHANNEL_OUTPUT; | |
1263 | attr->switch_timer_interval = DEFAULT_UST_PID_CHANNEL_SWITCH_TIMER; | |
1264 | attr->read_timer_interval = DEFAULT_UST_PID_CHANNEL_READ_TIMER; | |
1265 | break; | |
1266 | } | |
5edd7e09 | 1267 | default: |
441c16a7 | 1268 | /* Default behavior: leave set to 0. */ |
5edd7e09 DG |
1269 | break; |
1270 | } | |
1271 | } | |
1272 | ||
fac6795d | 1273 | /* |
2269e89e | 1274 | * Check if session daemon is alive. |
fac6795d | 1275 | * |
2269e89e | 1276 | * Return 1 if alive or 0 if not. |
1c8d13c8 | 1277 | * On error returns a negative value. |
fac6795d | 1278 | */ |
947308c4 | 1279 | int lttng_session_daemon_alive(void) |
fac6795d DG |
1280 | { |
1281 | int ret; | |
1282 | ||
1283 | ret = set_session_daemon_path(); | |
1284 | if (ret < 0) { | |
947308c4 | 1285 | /* Error */ |
fac6795d DG |
1286 | return ret; |
1287 | } | |
1288 | ||
9d035200 | 1289 | if (*sessiond_sock_path == '\0') { |
2f70b271 DG |
1290 | /* |
1291 | * No socket path set. Weird error which means the constructor was not | |
1292 | * called. | |
1293 | */ | |
1294 | assert(0); | |
fac6795d DG |
1295 | } |
1296 | ||
2269e89e | 1297 | ret = try_connect_sessiond(sessiond_sock_path); |
7d8234d9 MD |
1298 | if (ret < 0) { |
1299 | /* Not alive */ | |
1300 | return 0; | |
1301 | } | |
7d8234d9 | 1302 | |
947308c4 DG |
1303 | /* Is alive */ |
1304 | return 1; | |
fac6795d DG |
1305 | } |
1306 | ||
00e2e675 | 1307 | /* |
a4b92340 | 1308 | * Set URL for a consumer for a session and domain. |
00e2e675 DG |
1309 | * |
1310 | * Return 0 on success, else a negative value. | |
1311 | */ | |
a4b92340 DG |
1312 | int lttng_set_consumer_url(struct lttng_handle *handle, |
1313 | const char *control_url, const char *data_url) | |
00e2e675 | 1314 | { |
3dd05a85 | 1315 | int ret; |
a4b92340 | 1316 | ssize_t size; |
00e2e675 | 1317 | struct lttcomm_session_msg lsm; |
a4b92340 | 1318 | struct lttng_uri *uris = NULL; |
00e2e675 | 1319 | |
a4b92340 | 1320 | if (handle == NULL || (control_url == NULL && data_url == NULL)) { |
2f70b271 | 1321 | return -LTTNG_ERR_INVALID; |
00e2e675 DG |
1322 | } |
1323 | ||
a4b92340 DG |
1324 | memset(&lsm, 0, sizeof(lsm)); |
1325 | ||
00e2e675 DG |
1326 | lsm.cmd_type = LTTNG_SET_CONSUMER_URI; |
1327 | ||
cac3069d | 1328 | lttng_ctl_copy_string(lsm.session.name, handle->session_name, |
00e2e675 | 1329 | sizeof(lsm.session.name)); |
cac3069d | 1330 | lttng_ctl_copy_lttng_domain(&lsm.domain, &handle->domain); |
00e2e675 | 1331 | |
bc894455 | 1332 | size = uri_parse_str_urls(control_url, data_url, &uris); |
a4b92340 | 1333 | if (size < 0) { |
2f70b271 | 1334 | return -LTTNG_ERR_INVALID; |
a4b92340 DG |
1335 | } |
1336 | ||
1337 | lsm.u.uri.size = size; | |
00e2e675 | 1338 | |
cac3069d DG |
1339 | ret = lttng_ctl_ask_sessiond_varlen(&lsm, uris, |
1340 | sizeof(struct lttng_uri) * size, NULL); | |
3dd05a85 DG |
1341 | |
1342 | free(uris); | |
1343 | return ret; | |
00e2e675 DG |
1344 | } |
1345 | ||
1346 | /* | |
9c6bda17 | 1347 | * [OBSOLETE] |
00e2e675 DG |
1348 | */ |
1349 | int lttng_enable_consumer(struct lttng_handle *handle) | |
1350 | { | |
785d2d0d | 1351 | return -ENOSYS; |
00e2e675 DG |
1352 | } |
1353 | ||
1354 | /* | |
9c6bda17 | 1355 | * [OBSOLETE] |
00e2e675 DG |
1356 | */ |
1357 | int lttng_disable_consumer(struct lttng_handle *handle) | |
1358 | { | |
785d2d0d | 1359 | return -ENOSYS; |
00e2e675 DG |
1360 | } |
1361 | ||
44a5e5eb DG |
1362 | /* |
1363 | * Set health socket path by putting it in the global health_sock_path | |
1364 | * variable. | |
1365 | * | |
1366 | * Returns 0 on success or assert(0) on ENOMEM. | |
1367 | */ | |
1368 | static int set_health_socket_path(void) | |
1369 | { | |
44a5e5eb DG |
1370 | int in_tgroup = 0; /* In tracing group */ |
1371 | uid_t uid; | |
1372 | const char *home; | |
1373 | ||
1374 | uid = getuid(); | |
1375 | ||
1376 | if (uid != 0) { | |
1377 | /* Are we in the tracing group ? */ | |
1378 | in_tgroup = check_tracing_group(tracing_group); | |
1379 | } | |
1380 | ||
1381 | if ((uid == 0) || in_tgroup) { | |
cac3069d DG |
1382 | lttng_ctl_copy_string(health_sock_path, |
1383 | DEFAULT_GLOBAL_HEALTH_UNIX_SOCK, sizeof(health_sock_path)); | |
44a5e5eb DG |
1384 | } |
1385 | ||
1386 | if (uid != 0) { | |
c617c0c6 MD |
1387 | int ret; |
1388 | ||
44a5e5eb DG |
1389 | /* |
1390 | * With GNU C < 2.1, snprintf returns -1 if the target buffer is too small; | |
1391 | * With GNU C >= 2.1, snprintf returns the required size (excluding closing null) | |
1392 | */ | |
feb0f3e5 | 1393 | home = utils_get_home_dir(); |
44a5e5eb DG |
1394 | if (home == NULL) { |
1395 | /* Fallback in /tmp .. */ | |
1396 | home = "/tmp"; | |
1397 | } | |
1398 | ||
1399 | ret = snprintf(health_sock_path, sizeof(health_sock_path), | |
1400 | DEFAULT_HOME_HEALTH_UNIX_SOCK, home); | |
1401 | if ((ret < 0) || (ret >= sizeof(health_sock_path))) { | |
1402 | /* ENOMEM at this point... just kill the control lib. */ | |
1403 | assert(0); | |
1404 | } | |
1405 | } | |
1406 | ||
1407 | return 0; | |
1408 | } | |
1409 | ||
1410 | /* | |
1411 | * Check session daemon health for a specific health component. | |
1412 | * | |
2f70b271 | 1413 | * Return 0 if health is OK or else 1 if BAD. |
44a5e5eb | 1414 | * |
2f70b271 | 1415 | * Any other negative value is a lttng error code which can be translated with |
44a5e5eb DG |
1416 | * lttng_strerror(). |
1417 | */ | |
1418 | int lttng_health_check(enum lttng_health_component c) | |
1419 | { | |
1420 | int sock, ret; | |
1421 | struct lttcomm_health_msg msg; | |
1422 | struct lttcomm_health_data reply; | |
1423 | ||
1424 | /* Connect to the sesssion daemon */ | |
1425 | sock = lttcomm_connect_unix_sock(health_sock_path); | |
1426 | if (sock < 0) { | |
2f70b271 | 1427 | ret = -LTTNG_ERR_NO_SESSIOND; |
44a5e5eb DG |
1428 | goto error; |
1429 | } | |
1430 | ||
1431 | msg.cmd = LTTNG_HEALTH_CHECK; | |
1432 | msg.component = c; | |
1433 | ||
1434 | ret = lttcomm_send_unix_sock(sock, (void *)&msg, sizeof(msg)); | |
1435 | if (ret < 0) { | |
2f70b271 | 1436 | ret = -LTTNG_ERR_FATAL; |
44a5e5eb DG |
1437 | goto close_error; |
1438 | } | |
1439 | ||
1440 | ret = lttcomm_recv_unix_sock(sock, (void *)&reply, sizeof(reply)); | |
1441 | if (ret < 0) { | |
2f70b271 | 1442 | ret = -LTTNG_ERR_FATAL; |
44a5e5eb DG |
1443 | goto close_error; |
1444 | } | |
1445 | ||
1446 | ret = reply.ret_code; | |
1447 | ||
1448 | close_error: | |
67ef15b7 MD |
1449 | { |
1450 | int closeret; | |
1451 | ||
1452 | closeret = close(sock); | |
1453 | assert(!closeret); | |
1454 | } | |
44a5e5eb DG |
1455 | |
1456 | error: | |
1457 | return ret; | |
1458 | } | |
1459 | ||
07424f16 DG |
1460 | /* |
1461 | * This is an extension of create session that is ONLY and SHOULD only be used | |
1462 | * by the lttng command line program. It exists to avoid using URI parsing in | |
1463 | * the lttng client. | |
1464 | * | |
1465 | * We need the date and time for the trace path subdirectory for the case where | |
1466 | * the user does NOT define one using either -o or -U. Using the normal | |
1467 | * lttng_create_session API call, we have no clue on the session daemon side if | |
1468 | * the URL was generated automatically by the client or define by the user. | |
1469 | * | |
1470 | * So this function "wrapper" is hidden from the public API, takes the datetime | |
1471 | * string and appends it if necessary to the URI subdirectory before sending it | |
1472 | * to the session daemon. | |
1473 | * | |
1474 | * With this extra function, the lttng_create_session call behavior is not | |
1475 | * changed and the timestamp is appended to the URI on the session daemon side | |
1476 | * if necessary. | |
1477 | */ | |
1478 | int _lttng_create_session_ext(const char *name, const char *url, | |
1479 | const char *datetime) | |
1480 | { | |
3dd05a85 | 1481 | int ret; |
07424f16 DG |
1482 | ssize_t size; |
1483 | struct lttcomm_session_msg lsm; | |
1484 | struct lttng_uri *uris = NULL; | |
1485 | ||
2bba9e53 | 1486 | if (name == NULL || datetime == NULL) { |
2f70b271 | 1487 | return -LTTNG_ERR_INVALID; |
07424f16 DG |
1488 | } |
1489 | ||
1490 | memset(&lsm, 0, sizeof(lsm)); | |
1491 | ||
1492 | lsm.cmd_type = LTTNG_CREATE_SESSION; | |
cac3069d | 1493 | lttng_ctl_copy_string(lsm.session.name, name, sizeof(lsm.session.name)); |
07424f16 DG |
1494 | |
1495 | /* There should never be a data URL */ | |
bc894455 | 1496 | size = uri_parse_str_urls(url, NULL, &uris); |
07424f16 | 1497 | if (size < 0) { |
3dd05a85 DG |
1498 | ret = -LTTNG_ERR_INVALID; |
1499 | goto error; | |
07424f16 DG |
1500 | } |
1501 | ||
1502 | lsm.u.uri.size = size; | |
1503 | ||
4b35a6b3 | 1504 | if (size > 0 && uris[0].dtype != LTTNG_DST_PATH && strlen(uris[0].subdir) == 0) { |
da4aa2b8 DG |
1505 | /* Don't append datetime if the name was automatically created. */ |
1506 | if (strncmp(name, DEFAULT_SESSION_NAME "-", | |
1507 | strlen(DEFAULT_SESSION_NAME) + 1)) { | |
1508 | ret = snprintf(uris[0].subdir, sizeof(uris[0].subdir), "%s-%s", | |
1509 | name, datetime); | |
1510 | } else { | |
1511 | ret = snprintf(uris[0].subdir, sizeof(uris[0].subdir), "%s", name); | |
1512 | } | |
07424f16 DG |
1513 | if (ret < 0) { |
1514 | PERROR("snprintf uri subdir"); | |
3dd05a85 DG |
1515 | ret = -LTTNG_ERR_FATAL; |
1516 | goto error; | |
07424f16 DG |
1517 | } |
1518 | } | |
1519 | ||
cac3069d DG |
1520 | ret = lttng_ctl_ask_sessiond_varlen(&lsm, uris, |
1521 | sizeof(struct lttng_uri) * size, NULL); | |
3dd05a85 DG |
1522 | |
1523 | error: | |
1524 | free(uris); | |
1525 | return ret; | |
07424f16 DG |
1526 | } |
1527 | ||
806e2684 DG |
1528 | /* |
1529 | * For a given session name, this call checks if the data is ready to be read | |
1530 | * or is still being extracted by the consumer(s) hence not ready to be used by | |
1531 | * any readers. | |
1532 | */ | |
6d805429 | 1533 | int lttng_data_pending(const char *session_name) |
806e2684 DG |
1534 | { |
1535 | int ret; | |
1536 | struct lttcomm_session_msg lsm; | |
1537 | ||
1538 | if (session_name == NULL) { | |
1539 | return -LTTNG_ERR_INVALID; | |
1540 | } | |
1541 | ||
6d805429 | 1542 | lsm.cmd_type = LTTNG_DATA_PENDING; |
806e2684 | 1543 | |
cac3069d DG |
1544 | lttng_ctl_copy_string(lsm.session.name, session_name, |
1545 | sizeof(lsm.session.name)); | |
806e2684 | 1546 | |
cac3069d | 1547 | ret = lttng_ctl_ask_sessiond(&lsm, NULL); |
806e2684 DG |
1548 | |
1549 | /* | |
cac3069d DG |
1550 | * The lttng_ctl_ask_sessiond function negate the return code if it's not |
1551 | * LTTNG_OK so getting -1 means that the reply ret_code was 1 thus meaning | |
1552 | * that the data is available. Yes it is hackish but for now this is the | |
1553 | * only way. | |
806e2684 DG |
1554 | */ |
1555 | if (ret == -1) { | |
1556 | ret = 1; | |
1557 | } | |
1558 | ||
1559 | return ret; | |
1560 | } | |
1561 | ||
27babd3a DG |
1562 | /* |
1563 | * Create a session exclusively used for snapshot. | |
1564 | * | |
1565 | * Returns LTTNG_OK on success or a negative error code. | |
1566 | */ | |
1567 | int lttng_create_session_snapshot(const char *name, const char *snapshot_url) | |
1568 | { | |
1569 | int ret; | |
1570 | ssize_t size; | |
1571 | struct lttcomm_session_msg lsm; | |
1572 | struct lttng_uri *uris = NULL; | |
1573 | ||
1574 | if (name == NULL) { | |
1575 | return -LTTNG_ERR_INVALID; | |
1576 | } | |
1577 | ||
1578 | memset(&lsm, 0, sizeof(lsm)); | |
1579 | ||
1580 | lsm.cmd_type = LTTNG_CREATE_SESSION_SNAPSHOT; | |
1581 | lttng_ctl_copy_string(lsm.session.name, name, sizeof(lsm.session.name)); | |
1582 | ||
1583 | size = uri_parse_str_urls(snapshot_url, NULL, &uris); | |
1584 | if (size < 0) { | |
1585 | return -LTTNG_ERR_INVALID; | |
1586 | } | |
1587 | ||
1588 | lsm.u.uri.size = size; | |
1589 | ||
1590 | ret = lttng_ctl_ask_sessiond_varlen(&lsm, uris, | |
1591 | sizeof(struct lttng_uri) * size, NULL); | |
1592 | ||
1593 | free(uris); | |
1594 | return ret; | |
1595 | } | |
1596 | ||
fac6795d DG |
1597 | /* |
1598 | * lib constructor | |
1599 | */ | |
1600 | static void __attribute__((constructor)) init() | |
1601 | { | |
1602 | /* Set default session group */ | |
bbccc3d2 | 1603 | lttng_set_tracing_group(DEFAULT_TRACING_GROUP); |
44a5e5eb DG |
1604 | /* Set socket for health check */ |
1605 | (void) set_health_socket_path(); | |
fac6795d | 1606 | } |
49cca668 DG |
1607 | |
1608 | /* | |
1609 | * lib destructor | |
1610 | */ | |
1611 | static void __attribute__((destructor)) lttng_ctl_exit() | |
1612 | { | |
1613 | free(tracing_group); | |
1614 | } |