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 | ||
239f3aec | 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 | ||
239f3aec | 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 | ||
239f3aec | 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 | ||
582 | _MSG("Waiting for data availability"); | |
b7a81c24 | 583 | fflush(stdout); |
38ee087f DG |
584 | |
585 | /* Check for data availability */ | |
586 | do { | |
6d805429 | 587 | data_ret = lttng_data_pending(session_name); |
38ee087f DG |
588 | if (data_ret < 0) { |
589 | /* Return the data available call error. */ | |
590 | ret = data_ret; | |
591 | goto error; | |
592 | } | |
593 | ||
594 | /* | |
595 | * Data sleep time before retrying (in usec). Don't sleep if the call | |
596 | * returned value indicates availability. | |
597 | */ | |
6d805429 | 598 | if (data_ret) { |
38ee087f DG |
599 | usleep(DEFAULT_DATA_AVAILABILITY_WAIT_TIME); |
600 | _MSG("."); | |
b7a81c24 | 601 | fflush(stdout); |
38ee087f | 602 | } |
6d805429 | 603 | } while (data_ret != 0); |
38ee087f DG |
604 | |
605 | MSG(""); | |
606 | ||
607 | end: | |
608 | error: | |
609 | return ret; | |
610 | } | |
611 | ||
612 | /* | |
613 | * Stop tracing and wait for data availability. | |
614 | */ | |
615 | int lttng_stop_tracing(const char *session_name) | |
616 | { | |
617 | return _lttng_stop_tracing(session_name, 1); | |
618 | } | |
619 | ||
620 | /* | |
621 | * Stop tracing but _don't_ wait for data availability. | |
622 | */ | |
623 | int lttng_stop_tracing_no_wait(const char *session_name) | |
624 | { | |
625 | return _lttng_stop_tracing(session_name, 0); | |
f3ed775e DG |
626 | } |
627 | ||
628 | /* | |
601d5acf DG |
629 | * Add context to a channel. |
630 | * | |
631 | * If the given channel is NULL, add the contexts to all channels. | |
632 | * The event_name param is ignored. | |
af87c45a DG |
633 | * |
634 | * Returns the size of the returned payload data or a negative error code. | |
1df4dedd | 635 | */ |
cd80958d | 636 | int lttng_add_context(struct lttng_handle *handle, |
38057ed1 DG |
637 | struct lttng_event_context *ctx, const char *event_name, |
638 | const char *channel_name) | |
d65106b1 | 639 | { |
cd80958d DG |
640 | struct lttcomm_session_msg lsm; |
641 | ||
9d697d3d DG |
642 | /* Safety check. Both are mandatory */ |
643 | if (handle == NULL || ctx == NULL) { | |
2f70b271 | 644 | return -LTTNG_ERR_INVALID; |
cd80958d DG |
645 | } |
646 | ||
441c16a7 MD |
647 | memset(&lsm, 0, sizeof(lsm)); |
648 | ||
cd80958d DG |
649 | lsm.cmd_type = LTTNG_ADD_CONTEXT; |
650 | ||
85076754 MD |
651 | /* If no channel name, send empty string. */ |
652 | if (channel_name == NULL) { | |
653 | lttng_ctl_copy_string(lsm.u.context.channel_name, "", | |
654 | sizeof(lsm.u.context.channel_name)); | |
655 | } else { | |
656 | lttng_ctl_copy_string(lsm.u.context.channel_name, channel_name, | |
657 | sizeof(lsm.u.context.channel_name)); | |
658 | } | |
cd80958d | 659 | |
cac3069d | 660 | lttng_ctl_copy_lttng_domain(&lsm.domain, &handle->domain); |
d65106b1 | 661 | |
9d697d3d | 662 | memcpy(&lsm.u.context.ctx, ctx, sizeof(struct lttng_event_context)); |
d65106b1 | 663 | |
cac3069d | 664 | lttng_ctl_copy_string(lsm.session.name, handle->session_name, |
cd80958d DG |
665 | sizeof(lsm.session.name)); |
666 | ||
cac3069d | 667 | return lttng_ctl_ask_sessiond(&lsm, NULL); |
d65106b1 DG |
668 | } |
669 | ||
f3ed775e | 670 | /* |
1c8d13c8 TD |
671 | * Enable event(s) for a channel. |
672 | * If no event name is specified, all events are enabled. | |
673 | * If no channel name is specified, the default 'channel0' is used. | |
674 | * Returns size of returned session payload data or a negative error code. | |
f3ed775e | 675 | */ |
cd80958d | 676 | int lttng_enable_event(struct lttng_handle *handle, |
38057ed1 | 677 | struct lttng_event *ev, const char *channel_name) |
1df4dedd | 678 | { |
f8a96544 JI |
679 | return lttng_enable_event_with_exclusions(handle, ev, channel_name, |
680 | NULL, 0, NULL); | |
1df4dedd DG |
681 | } |
682 | ||
53a80697 | 683 | /* |
025faf73 | 684 | * Create or enable an event with a filter expression. |
178191b3 | 685 | * |
53a80697 MD |
686 | * Return negative error value on error. |
687 | * Return size of returned session payload data if OK. | |
688 | */ | |
025faf73 | 689 | int lttng_enable_event_with_filter(struct lttng_handle *handle, |
178191b3 | 690 | struct lttng_event *event, const char *channel_name, |
53a80697 MD |
691 | const char *filter_expression) |
692 | { | |
f8a96544 JI |
693 | return lttng_enable_event_with_exclusions(handle, event, channel_name, |
694 | filter_expression, 0, NULL); | |
53a80697 MD |
695 | } |
696 | ||
93deb080 JI |
697 | /* |
698 | * Enable event(s) for a channel, possibly with exclusions and a filter. | |
699 | * If no event name is specified, all events are enabled. | |
700 | * If no channel name is specified, the default name is used. | |
701 | * If filter expression is not NULL, the filter is set for the event. | |
702 | * If exclusion count is not zero, the exclusions are set for the event. | |
703 | * Returns size of returned session payload data or a negative error code. | |
704 | */ | |
705 | int lttng_enable_event_with_exclusions(struct lttng_handle *handle, | |
706 | struct lttng_event *ev, const char *channel_name, | |
707 | const char *filter_expression, | |
708 | int exclusion_count, char **exclusion_list) | |
709 | { | |
710 | struct lttcomm_session_msg lsm; | |
473037af | 711 | char *varlen_data, *jul_filter = NULL; |
93deb080 JI |
712 | int ret = 0; |
713 | struct filter_parser_ctx *ctx = NULL; | |
714 | FILE *fmem = NULL; | |
715 | ||
716 | if (handle == NULL || ev == NULL) { | |
717 | return -LTTNG_ERR_INVALID; | |
718 | } | |
719 | ||
720 | /* Empty filter string will always be rejected by the parser | |
721 | * anyway, so treat this corner-case early to eliminate | |
722 | * lttng_fmemopen error for 0-byte allocation. | |
723 | */ | |
724 | if (filter_expression && filter_expression[0] == '\0') { | |
725 | return -LTTNG_ERR_INVALID; | |
726 | } | |
727 | ||
728 | memset(&lsm, 0, sizeof(lsm)); | |
729 | ||
730 | /* If no channel name, send empty string. */ | |
731 | if (channel_name == NULL) { | |
732 | lttng_ctl_copy_string(lsm.u.enable.channel_name, "", | |
733 | sizeof(lsm.u.enable.channel_name)); | |
734 | } else { | |
735 | lttng_ctl_copy_string(lsm.u.enable.channel_name, channel_name, | |
736 | sizeof(lsm.u.enable.channel_name)); | |
737 | } | |
738 | ||
6565421f DG |
739 | if (ev->name[0] != '\0') { |
740 | lsm.cmd_type = LTTNG_ENABLE_EVENT; | |
741 | } else { | |
742 | lsm.cmd_type = LTTNG_ENABLE_ALL_EVENT; | |
743 | } | |
93deb080 | 744 | |
6565421f | 745 | lttng_ctl_copy_lttng_domain(&lsm.domain, &handle->domain); |
93deb080 JI |
746 | memcpy(&lsm.u.enable.event, ev, sizeof(lsm.u.enable.event)); |
747 | ||
748 | lttng_ctl_copy_string(lsm.session.name, handle->session_name, | |
749 | sizeof(lsm.session.name)); | |
750 | lsm.u.enable.exclusion_count = exclusion_count; | |
751 | lsm.u.enable.bytecode_len = 0; | |
752 | ||
473037af DG |
753 | /* |
754 | * For the JUL domain, a filter is enforced except for the enable all | |
755 | * event. This is done to avoid having the event in all sessions thus | |
756 | * filtering by logger name. | |
757 | */ | |
758 | if (exclusion_count == 0 && filter_expression == NULL && | |
e8949acb DG |
759 | handle->domain.type != LTTNG_DOMAIN_JUL) { |
760 | goto ask_sessiond; | |
93deb080 JI |
761 | } |
762 | ||
763 | /* | |
764 | * We have either a filter or some exclusions, so we need to set up | |
765 | * a variable-length memory block from where to send the data | |
766 | */ | |
767 | ||
768 | /* Parse filter expression */ | |
e8949acb | 769 | if (filter_expression != NULL || handle->domain.type == LTTNG_DOMAIN_JUL) { |
473037af DG |
770 | if (handle->domain.type == LTTNG_DOMAIN_JUL) { |
771 | int err; | |
772 | ||
e8949acb DG |
773 | if (ev->name[0] != '*') { |
774 | if (filter_expression) { | |
775 | err = asprintf(&jul_filter, "%s && logger_name == \"%s\"", | |
776 | filter_expression, ev->name); | |
777 | } else { | |
778 | err = asprintf(&jul_filter, "logger_name == \"%s\"", | |
779 | ev->name); | |
780 | } | |
781 | if (err < 0) { | |
782 | PERROR("asprintf"); | |
783 | return -LTTNG_ERR_NOMEM; | |
784 | } | |
785 | filter_expression = jul_filter; | |
473037af | 786 | } |
e8949acb DG |
787 | |
788 | /* Add loglevel filtering if any for the JUL domain. */ | |
789 | if (ev->loglevel_type != LTTNG_EVENT_LOGLEVEL_ALL) { | |
790 | char *op; | |
791 | ||
792 | if (ev->loglevel_type == LTTNG_EVENT_LOGLEVEL_RANGE) { | |
793 | op = ">="; | |
794 | } else { | |
795 | op = "=="; | |
796 | } | |
797 | ||
798 | if (filter_expression) { | |
799 | err = asprintf(&jul_filter, "%s && int_loglevel %s %d", | |
800 | filter_expression, op, ev->loglevel); | |
801 | } else { | |
802 | err = asprintf(&jul_filter, "int_loglevel %s %d", op, | |
803 | ev->loglevel); | |
804 | } | |
805 | if (err < 0) { | |
806 | PERROR("asprintf"); | |
807 | return -LTTNG_ERR_NOMEM; | |
808 | } | |
809 | filter_expression = jul_filter; | |
810 | } | |
811 | ||
812 | if (!filter_expression) { | |
813 | goto ask_sessiond; | |
473037af | 814 | } |
473037af | 815 | } |
93deb080 JI |
816 | |
817 | /* | |
818 | * casting const to non-const, as the underlying function will | |
819 | * use it in read-only mode. | |
820 | */ | |
821 | fmem = lttng_fmemopen((void *) filter_expression, | |
822 | strlen(filter_expression), "r"); | |
823 | if (!fmem) { | |
824 | fprintf(stderr, "Error opening memory as stream\n"); | |
473037af | 825 | free(jul_filter); |
93deb080 JI |
826 | return -LTTNG_ERR_FILTER_NOMEM; |
827 | } | |
828 | ctx = filter_parser_ctx_alloc(fmem); | |
829 | if (!ctx) { | |
830 | fprintf(stderr, "Error allocating parser\n"); | |
831 | ret = -LTTNG_ERR_FILTER_NOMEM; | |
832 | goto filter_alloc_error; | |
833 | } | |
834 | ret = filter_parser_ctx_append_ast(ctx); | |
835 | if (ret) { | |
836 | fprintf(stderr, "Parse error\n"); | |
837 | ret = -LTTNG_ERR_FILTER_INVAL; | |
838 | goto parse_error; | |
839 | } | |
840 | ret = filter_visitor_set_parent(ctx); | |
841 | if (ret) { | |
842 | fprintf(stderr, "Set parent error\n"); | |
843 | ret = -LTTNG_ERR_FILTER_INVAL; | |
844 | goto parse_error; | |
845 | } | |
846 | if (print_xml) { | |
847 | ret = filter_visitor_print_xml(ctx, stdout, 0); | |
848 | if (ret) { | |
849 | fflush(stdout); | |
850 | fprintf(stderr, "XML print error\n"); | |
851 | ret = -LTTNG_ERR_FILTER_INVAL; | |
852 | goto parse_error; | |
853 | } | |
854 | } | |
855 | ||
856 | dbg_printf("Generating IR... "); | |
857 | fflush(stdout); | |
858 | ret = filter_visitor_ir_generate(ctx); | |
859 | if (ret) { | |
860 | fprintf(stderr, "Generate IR error\n"); | |
861 | ret = -LTTNG_ERR_FILTER_INVAL; | |
862 | goto parse_error; | |
863 | } | |
864 | dbg_printf("done\n"); | |
865 | ||
866 | dbg_printf("Validating IR... "); | |
867 | fflush(stdout); | |
868 | ret = filter_visitor_ir_check_binary_op_nesting(ctx); | |
869 | if (ret) { | |
870 | ret = -LTTNG_ERR_FILTER_INVAL; | |
871 | goto parse_error; | |
872 | } | |
873 | dbg_printf("done\n"); | |
874 | ||
875 | dbg_printf("Generating bytecode... "); | |
876 | fflush(stdout); | |
877 | ret = filter_visitor_bytecode_generate(ctx); | |
878 | if (ret) { | |
879 | fprintf(stderr, "Generate bytecode error\n"); | |
880 | ret = -LTTNG_ERR_FILTER_INVAL; | |
881 | goto parse_error; | |
882 | } | |
883 | dbg_printf("done\n"); | |
884 | dbg_printf("Size of bytecode generated: %u bytes.\n", | |
885 | bytecode_get_len(&ctx->bytecode->b)); | |
886 | ||
887 | lsm.u.enable.bytecode_len = sizeof(ctx->bytecode->b) | |
888 | + bytecode_get_len(&ctx->bytecode->b); | |
889 | } | |
890 | ||
891 | /* Allocate variable length data */ | |
892 | if (lsm.u.enable.exclusion_count != 0) { | |
893 | varlen_data = zmalloc(lsm.u.enable.bytecode_len | |
894 | + LTTNG_SYMBOL_NAME_LEN * exclusion_count); | |
895 | if (!varlen_data) { | |
896 | ret = -LTTNG_ERR_EXCLUSION_NOMEM; | |
897 | goto varlen_alloc_error; | |
898 | } | |
899 | /* Put exclusion names first in the data */ | |
900 | while (exclusion_count--) { | |
901 | strncpy(varlen_data + LTTNG_SYMBOL_NAME_LEN * exclusion_count, | |
902 | *(exclusion_list + exclusion_count), | |
903 | LTTNG_SYMBOL_NAME_LEN); | |
904 | } | |
905 | /* Add filter bytecode next */ | |
906 | if (lsm.u.enable.bytecode_len != 0) { | |
907 | memcpy(varlen_data + LTTNG_SYMBOL_NAME_LEN * lsm.u.enable.exclusion_count, | |
908 | &ctx->bytecode->b, | |
909 | lsm.u.enable.bytecode_len); | |
910 | } | |
911 | } else { | |
912 | /* no exclusions - use the already allocated filter bytecode */ | |
913 | varlen_data = (char *)(&ctx->bytecode->b); | |
914 | } | |
915 | ||
916 | ret = lttng_ctl_ask_sessiond_varlen(&lsm, varlen_data, | |
67676bd8 DG |
917 | (LTTNG_SYMBOL_NAME_LEN * lsm.u.enable.exclusion_count) + |
918 | lsm.u.enable.bytecode_len, NULL); | |
93deb080 JI |
919 | |
920 | if (lsm.u.enable.exclusion_count != 0) { | |
921 | free(varlen_data); | |
922 | } | |
923 | ||
924 | varlen_alloc_error: | |
925 | if (filter_expression) { | |
926 | filter_bytecode_free(ctx); | |
927 | filter_ir_free(ctx); | |
928 | filter_parser_ctx_free(ctx); | |
929 | if (fclose(fmem) != 0) { | |
930 | perror("fclose"); | |
931 | } | |
932 | } | |
473037af | 933 | free(jul_filter); |
93deb080 JI |
934 | return ret; |
935 | ||
936 | parse_error: | |
937 | filter_bytecode_free(ctx); | |
938 | filter_ir_free(ctx); | |
939 | filter_parser_ctx_free(ctx); | |
940 | filter_alloc_error: | |
941 | if (fclose(fmem) != 0) { | |
942 | perror("fclose"); | |
943 | } | |
473037af | 944 | free(jul_filter); |
93deb080 | 945 | return ret; |
e8949acb DG |
946 | |
947 | ask_sessiond: | |
948 | ret = lttng_ctl_ask_sessiond(&lsm, NULL); | |
949 | return ret; | |
93deb080 JI |
950 | } |
951 | ||
1df4dedd | 952 | /* |
1c8d13c8 TD |
953 | * Disable event(s) of a channel and domain. |
954 | * If no event name is specified, all events are disabled. | |
955 | * If no channel name is specified, the default 'channel0' is used. | |
956 | * Returns size of returned session payload data or a negative error code. | |
1df4dedd | 957 | */ |
cd80958d | 958 | int lttng_disable_event(struct lttng_handle *handle, const char *name, |
38057ed1 | 959 | const char *channel_name) |
1df4dedd | 960 | { |
cd80958d | 961 | struct lttcomm_session_msg lsm; |
1df4dedd | 962 | |
9d697d3d | 963 | if (handle == NULL) { |
2f70b271 | 964 | return -LTTNG_ERR_INVALID; |
cd80958d DG |
965 | } |
966 | ||
441c16a7 MD |
967 | memset(&lsm, 0, sizeof(lsm)); |
968 | ||
85076754 MD |
969 | /* If no channel name, send empty string. */ |
970 | if (channel_name == NULL) { | |
971 | lttng_ctl_copy_string(lsm.u.disable.channel_name, "", | |
cd80958d | 972 | sizeof(lsm.u.disable.channel_name)); |
f3ed775e | 973 | } else { |
85076754 | 974 | lttng_ctl_copy_string(lsm.u.disable.channel_name, channel_name, |
cd80958d | 975 | sizeof(lsm.u.disable.channel_name)); |
eb354453 DG |
976 | } |
977 | ||
cac3069d | 978 | lttng_ctl_copy_lttng_domain(&lsm.domain, &handle->domain); |
f5177a38 | 979 | |
f84efadf | 980 | if (name != NULL) { |
cac3069d DG |
981 | lttng_ctl_copy_string(lsm.u.disable.name, name, |
982 | sizeof(lsm.u.disable.name)); | |
cd80958d | 983 | lsm.cmd_type = LTTNG_DISABLE_EVENT; |
f5177a38 | 984 | } else { |
cd80958d | 985 | lsm.cmd_type = LTTNG_DISABLE_ALL_EVENT; |
f3ed775e DG |
986 | } |
987 | ||
cac3069d | 988 | lttng_ctl_copy_string(lsm.session.name, handle->session_name, |
cd80958d DG |
989 | sizeof(lsm.session.name)); |
990 | ||
cac3069d | 991 | return lttng_ctl_ask_sessiond(&lsm, NULL); |
1df4dedd DG |
992 | } |
993 | ||
994 | /* | |
1c8d13c8 TD |
995 | * Enable channel per domain |
996 | * Returns size of returned session payload data or a negative error code. | |
a5c5a2bd | 997 | */ |
cd80958d | 998 | int lttng_enable_channel(struct lttng_handle *handle, |
38057ed1 | 999 | struct lttng_channel *chan) |
a5c5a2bd | 1000 | { |
cd80958d DG |
1001 | struct lttcomm_session_msg lsm; |
1002 | ||
5117eeec DG |
1003 | /* |
1004 | * NULL arguments are forbidden. No default values. | |
1005 | */ | |
1006 | if (handle == NULL || chan == NULL) { | |
2f70b271 | 1007 | return -LTTNG_ERR_INVALID; |
cd80958d DG |
1008 | } |
1009 | ||
441c16a7 MD |
1010 | memset(&lsm, 0, sizeof(lsm)); |
1011 | ||
5117eeec | 1012 | memcpy(&lsm.u.channel.chan, chan, sizeof(lsm.u.channel.chan)); |
7d29a247 | 1013 | |
cd80958d DG |
1014 | lsm.cmd_type = LTTNG_ENABLE_CHANNEL; |
1015 | ||
cac3069d | 1016 | lttng_ctl_copy_lttng_domain(&lsm.domain, &handle->domain); |
7d29a247 | 1017 | |
cac3069d | 1018 | lttng_ctl_copy_string(lsm.session.name, handle->session_name, |
cd80958d DG |
1019 | sizeof(lsm.session.name)); |
1020 | ||
cac3069d | 1021 | return lttng_ctl_ask_sessiond(&lsm, NULL); |
8c0faa1d | 1022 | } |
1df4dedd | 1023 | |
2ef84c95 | 1024 | /* |
1c8d13c8 TD |
1025 | * All tracing will be stopped for registered events of the channel. |
1026 | * Returns size of returned session payload data or a negative error code. | |
2ef84c95 | 1027 | */ |
cd80958d | 1028 | int lttng_disable_channel(struct lttng_handle *handle, const char *name) |
2ef84c95 | 1029 | { |
cd80958d DG |
1030 | struct lttcomm_session_msg lsm; |
1031 | ||
9d697d3d DG |
1032 | /* Safety check. Both are mandatory */ |
1033 | if (handle == NULL || name == NULL) { | |
2f70b271 | 1034 | return -LTTNG_ERR_INVALID; |
cd80958d DG |
1035 | } |
1036 | ||
441c16a7 MD |
1037 | memset(&lsm, 0, sizeof(lsm)); |
1038 | ||
cd80958d | 1039 | lsm.cmd_type = LTTNG_DISABLE_CHANNEL; |
1df4dedd | 1040 | |
cac3069d | 1041 | lttng_ctl_copy_string(lsm.u.disable.channel_name, name, |
9d697d3d DG |
1042 | sizeof(lsm.u.disable.channel_name)); |
1043 | ||
cac3069d | 1044 | lttng_ctl_copy_lttng_domain(&lsm.domain, &handle->domain); |
cd80958d | 1045 | |
cac3069d | 1046 | lttng_ctl_copy_string(lsm.session.name, handle->session_name, |
cd80958d DG |
1047 | sizeof(lsm.session.name)); |
1048 | ||
cac3069d | 1049 | return lttng_ctl_ask_sessiond(&lsm, NULL); |
ca95a216 DG |
1050 | } |
1051 | ||
fac6795d | 1052 | /* |
1c8d13c8 TD |
1053 | * Lists all available tracepoints of domain. |
1054 | * Sets the contents of the events array. | |
1055 | * Returns the number of lttng_event entries in events; | |
1056 | * on error, returns a negative value. | |
fac6795d | 1057 | */ |
cd80958d | 1058 | int lttng_list_tracepoints(struct lttng_handle *handle, |
2a71efd5 | 1059 | struct lttng_event **events) |
fac6795d | 1060 | { |
052da939 | 1061 | int ret; |
cd80958d DG |
1062 | struct lttcomm_session_msg lsm; |
1063 | ||
9d697d3d | 1064 | if (handle == NULL) { |
2f70b271 | 1065 | return -LTTNG_ERR_INVALID; |
cd80958d | 1066 | } |
fac6795d | 1067 | |
239f3aec | 1068 | memset(&lsm, 0, sizeof(lsm)); |
cd80958d | 1069 | lsm.cmd_type = LTTNG_LIST_TRACEPOINTS; |
cac3069d | 1070 | lttng_ctl_copy_lttng_domain(&lsm.domain, &handle->domain); |
2a71efd5 | 1071 | |
cac3069d | 1072 | ret = lttng_ctl_ask_sessiond(&lsm, (void **) events); |
052da939 DG |
1073 | if (ret < 0) { |
1074 | return ret; | |
eb354453 | 1075 | } |
fac6795d | 1076 | |
9f19cc17 | 1077 | return ret / sizeof(struct lttng_event); |
fac6795d DG |
1078 | } |
1079 | ||
f37d259d MD |
1080 | /* |
1081 | * Lists all available tracepoint fields of domain. | |
1082 | * Sets the contents of the event field array. | |
1083 | * Returns the number of lttng_event_field entries in events; | |
1084 | * on error, returns a negative value. | |
1085 | */ | |
1086 | int lttng_list_tracepoint_fields(struct lttng_handle *handle, | |
1087 | struct lttng_event_field **fields) | |
1088 | { | |
1089 | int ret; | |
1090 | struct lttcomm_session_msg lsm; | |
1091 | ||
1092 | if (handle == NULL) { | |
2f70b271 | 1093 | return -LTTNG_ERR_INVALID; |
f37d259d MD |
1094 | } |
1095 | ||
239f3aec | 1096 | memset(&lsm, 0, sizeof(lsm)); |
f37d259d | 1097 | lsm.cmd_type = LTTNG_LIST_TRACEPOINT_FIELDS; |
cac3069d | 1098 | lttng_ctl_copy_lttng_domain(&lsm.domain, &handle->domain); |
f37d259d | 1099 | |
cac3069d | 1100 | ret = lttng_ctl_ask_sessiond(&lsm, (void **) fields); |
f37d259d MD |
1101 | if (ret < 0) { |
1102 | return ret; | |
1103 | } | |
1104 | ||
1105 | return ret / sizeof(struct lttng_event_field); | |
1106 | } | |
1107 | ||
1657e9bb | 1108 | /* |
1c8d13c8 TD |
1109 | * Returns a human readable string describing |
1110 | * the error code (a negative value). | |
1657e9bb | 1111 | */ |
9a745bc7 | 1112 | const char *lttng_strerror(int code) |
1657e9bb | 1113 | { |
f73fabfd | 1114 | return error_get_str(code); |
1657e9bb DG |
1115 | } |
1116 | ||
aaf97519 | 1117 | /* |
a4b92340 DG |
1118 | * Create a brand new session using name and url for destination. |
1119 | * | |
f73fabfd | 1120 | * Returns LTTNG_OK on success or a negative error code. |
00e2e675 | 1121 | */ |
a4b92340 | 1122 | int lttng_create_session(const char *name, const char *url) |
00e2e675 | 1123 | { |
3dd05a85 | 1124 | int ret; |
a4b92340 | 1125 | ssize_t size; |
00e2e675 | 1126 | struct lttcomm_session_msg lsm; |
a4b92340 | 1127 | struct lttng_uri *uris = NULL; |
00e2e675 | 1128 | |
a4b92340 | 1129 | if (name == NULL) { |
2f70b271 | 1130 | return -LTTNG_ERR_INVALID; |
00e2e675 DG |
1131 | } |
1132 | ||
a4b92340 | 1133 | memset(&lsm, 0, sizeof(lsm)); |
00e2e675 | 1134 | |
a4b92340 | 1135 | lsm.cmd_type = LTTNG_CREATE_SESSION; |
cac3069d | 1136 | lttng_ctl_copy_string(lsm.session.name, name, sizeof(lsm.session.name)); |
a4b92340 DG |
1137 | |
1138 | /* There should never be a data URL */ | |
bc894455 | 1139 | size = uri_parse_str_urls(url, NULL, &uris); |
a4b92340 | 1140 | if (size < 0) { |
2f70b271 | 1141 | return -LTTNG_ERR_INVALID; |
00e2e675 DG |
1142 | } |
1143 | ||
a4b92340 DG |
1144 | lsm.u.uri.size = size; |
1145 | ||
cac3069d DG |
1146 | ret = lttng_ctl_ask_sessiond_varlen(&lsm, uris, |
1147 | sizeof(struct lttng_uri) * size, NULL); | |
3dd05a85 DG |
1148 | |
1149 | free(uris); | |
1150 | return ret; | |
00e2e675 DG |
1151 | } |
1152 | ||
8028d920 | 1153 | /* |
8028d920 | 1154 | * Destroy session using name. |
1c8d13c8 | 1155 | * Returns size of returned session payload data or a negative error code. |
8028d920 | 1156 | */ |
843f5df9 | 1157 | int lttng_destroy_session(const char *session_name) |
8028d920 | 1158 | { |
cd80958d DG |
1159 | struct lttcomm_session_msg lsm; |
1160 | ||
843f5df9 | 1161 | if (session_name == NULL) { |
2f70b271 | 1162 | return -LTTNG_ERR_INVALID; |
cd80958d DG |
1163 | } |
1164 | ||
239f3aec | 1165 | memset(&lsm, 0, sizeof(lsm)); |
cd80958d | 1166 | lsm.cmd_type = LTTNG_DESTROY_SESSION; |
843f5df9 | 1167 | |
cac3069d DG |
1168 | lttng_ctl_copy_string(lsm.session.name, session_name, |
1169 | sizeof(lsm.session.name)); | |
cd80958d | 1170 | |
cac3069d | 1171 | return lttng_ctl_ask_sessiond(&lsm, NULL); |
aaf97519 DG |
1172 | } |
1173 | ||
57167058 | 1174 | /* |
57167058 | 1175 | * Ask the session daemon for all available sessions. |
1c8d13c8 TD |
1176 | * Sets the contents of the sessions array. |
1177 | * Returns the number of lttng_session entries in sessions; | |
1178 | * on error, returns a negative value. | |
57167058 | 1179 | */ |
ca95a216 | 1180 | int lttng_list_sessions(struct lttng_session **sessions) |
57167058 | 1181 | { |
ca95a216 | 1182 | int ret; |
cd80958d | 1183 | struct lttcomm_session_msg lsm; |
57167058 | 1184 | |
239f3aec | 1185 | memset(&lsm, 0, sizeof(lsm)); |
cd80958d | 1186 | lsm.cmd_type = LTTNG_LIST_SESSIONS; |
cac3069d | 1187 | ret = lttng_ctl_ask_sessiond(&lsm, (void**) sessions); |
57167058 | 1188 | if (ret < 0) { |
ca95a216 | 1189 | return ret; |
57167058 DG |
1190 | } |
1191 | ||
ca95a216 | 1192 | return ret / sizeof(struct lttng_session); |
57167058 DG |
1193 | } |
1194 | ||
9f19cc17 | 1195 | /* |
1c8d13c8 TD |
1196 | * Ask the session daemon for all available domains of a session. |
1197 | * Sets the contents of the domains array. | |
1198 | * Returns the number of lttng_domain entries in domains; | |
1199 | * on error, returns a negative value. | |
9f19cc17 | 1200 | */ |
330be774 | 1201 | int lttng_list_domains(const char *session_name, |
cd80958d | 1202 | struct lttng_domain **domains) |
9f19cc17 DG |
1203 | { |
1204 | int ret; | |
cd80958d DG |
1205 | struct lttcomm_session_msg lsm; |
1206 | ||
330be774 | 1207 | if (session_name == NULL) { |
2f70b271 | 1208 | return -LTTNG_ERR_INVALID; |
cd80958d | 1209 | } |
9f19cc17 | 1210 | |
239f3aec | 1211 | memset(&lsm, 0, sizeof(lsm)); |
cd80958d DG |
1212 | lsm.cmd_type = LTTNG_LIST_DOMAINS; |
1213 | ||
cac3069d DG |
1214 | lttng_ctl_copy_string(lsm.session.name, session_name, |
1215 | sizeof(lsm.session.name)); | |
cd80958d | 1216 | |
cac3069d | 1217 | ret = lttng_ctl_ask_sessiond(&lsm, (void**) domains); |
9f19cc17 DG |
1218 | if (ret < 0) { |
1219 | return ret; | |
1220 | } | |
1221 | ||
1222 | return ret / sizeof(struct lttng_domain); | |
1223 | } | |
1224 | ||
1225 | /* | |
1c8d13c8 TD |
1226 | * Ask the session daemon for all available channels of a session. |
1227 | * Sets the contents of the channels array. | |
1228 | * Returns the number of lttng_channel entries in channels; | |
1229 | * on error, returns a negative value. | |
9f19cc17 | 1230 | */ |
cd80958d DG |
1231 | int lttng_list_channels(struct lttng_handle *handle, |
1232 | struct lttng_channel **channels) | |
9f19cc17 DG |
1233 | { |
1234 | int ret; | |
cd80958d DG |
1235 | struct lttcomm_session_msg lsm; |
1236 | ||
9d697d3d | 1237 | if (handle == NULL) { |
2f70b271 | 1238 | return -LTTNG_ERR_INVALID; |
cd80958d DG |
1239 | } |
1240 | ||
239f3aec | 1241 | memset(&lsm, 0, sizeof(lsm)); |
cd80958d | 1242 | lsm.cmd_type = LTTNG_LIST_CHANNELS; |
cac3069d | 1243 | lttng_ctl_copy_string(lsm.session.name, handle->session_name, |
cd80958d | 1244 | sizeof(lsm.session.name)); |
9f19cc17 | 1245 | |
cac3069d | 1246 | lttng_ctl_copy_lttng_domain(&lsm.domain, &handle->domain); |
9f19cc17 | 1247 | |
cac3069d | 1248 | ret = lttng_ctl_ask_sessiond(&lsm, (void**) channels); |
9f19cc17 DG |
1249 | if (ret < 0) { |
1250 | return ret; | |
1251 | } | |
1252 | ||
1253 | return ret / sizeof(struct lttng_channel); | |
1254 | } | |
1255 | ||
1256 | /* | |
1c8d13c8 TD |
1257 | * Ask the session daemon for all available events of a session channel. |
1258 | * Sets the contents of the events array. | |
1259 | * Returns the number of lttng_event entries in events; | |
1260 | * on error, returns a negative value. | |
9f19cc17 | 1261 | */ |
cd80958d DG |
1262 | int lttng_list_events(struct lttng_handle *handle, |
1263 | const char *channel_name, struct lttng_event **events) | |
9f19cc17 DG |
1264 | { |
1265 | int ret; | |
cd80958d | 1266 | struct lttcomm_session_msg lsm; |
9f19cc17 | 1267 | |
9d697d3d DG |
1268 | /* Safety check. An handle and channel name are mandatory */ |
1269 | if (handle == NULL || channel_name == NULL) { | |
2f70b271 | 1270 | return -LTTNG_ERR_INVALID; |
cd80958d DG |
1271 | } |
1272 | ||
239f3aec | 1273 | memset(&lsm, 0, sizeof(lsm)); |
cd80958d | 1274 | lsm.cmd_type = LTTNG_LIST_EVENTS; |
cac3069d | 1275 | lttng_ctl_copy_string(lsm.session.name, handle->session_name, |
cd80958d | 1276 | sizeof(lsm.session.name)); |
cac3069d | 1277 | lttng_ctl_copy_string(lsm.u.list.channel_name, channel_name, |
cd80958d DG |
1278 | sizeof(lsm.u.list.channel_name)); |
1279 | ||
cac3069d | 1280 | lttng_ctl_copy_lttng_domain(&lsm.domain, &handle->domain); |
9f19cc17 | 1281 | |
cac3069d | 1282 | ret = lttng_ctl_ask_sessiond(&lsm, (void**) events); |
9f19cc17 DG |
1283 | if (ret < 0) { |
1284 | return ret; | |
1285 | } | |
1286 | ||
1287 | return ret / sizeof(struct lttng_event); | |
1288 | } | |
1289 | ||
fac6795d | 1290 | /* |
1c8d13c8 TD |
1291 | * Sets the tracing_group variable with name. |
1292 | * This function allocates memory pointed to by tracing_group. | |
1293 | * On success, returns 0, on error, returns -1 (null name) or -ENOMEM. | |
fac6795d DG |
1294 | */ |
1295 | int lttng_set_tracing_group(const char *name) | |
1296 | { | |
9d697d3d | 1297 | if (name == NULL) { |
2f70b271 | 1298 | return -LTTNG_ERR_INVALID; |
9d697d3d DG |
1299 | } |
1300 | ||
fac6795d | 1301 | if (asprintf(&tracing_group, "%s", name) < 0) { |
2f70b271 | 1302 | return -LTTNG_ERR_FATAL; |
fac6795d DG |
1303 | } |
1304 | ||
1305 | return 0; | |
1306 | } | |
1307 | ||
d0254c7c | 1308 | /* |
af87c45a | 1309 | * Returns size of returned session payload data or a negative error code. |
d0254c7c | 1310 | */ |
cd80958d | 1311 | int lttng_calibrate(struct lttng_handle *handle, |
d0254c7c MD |
1312 | struct lttng_calibrate *calibrate) |
1313 | { | |
cd80958d | 1314 | struct lttcomm_session_msg lsm; |
d0254c7c | 1315 | |
9d697d3d DG |
1316 | /* Safety check. NULL pointer are forbidden */ |
1317 | if (handle == NULL || calibrate == NULL) { | |
2f70b271 | 1318 | return -LTTNG_ERR_INVALID; |
cd80958d | 1319 | } |
d0254c7c | 1320 | |
239f3aec | 1321 | memset(&lsm, 0, sizeof(lsm)); |
cd80958d | 1322 | lsm.cmd_type = LTTNG_CALIBRATE; |
cac3069d | 1323 | lttng_ctl_copy_lttng_domain(&lsm.domain, &handle->domain); |
d0254c7c | 1324 | |
cd80958d DG |
1325 | memcpy(&lsm.u.calibrate, calibrate, sizeof(lsm.u.calibrate)); |
1326 | ||
cac3069d | 1327 | return lttng_ctl_ask_sessiond(&lsm, NULL); |
d0254c7c MD |
1328 | } |
1329 | ||
5edd7e09 DG |
1330 | /* |
1331 | * Set default channel attributes. | |
441c16a7 | 1332 | * If either or both of the arguments are null, attr content is zeroe'd. |
5edd7e09 DG |
1333 | */ |
1334 | void lttng_channel_set_default_attr(struct lttng_domain *domain, | |
1335 | struct lttng_channel_attr *attr) | |
1336 | { | |
1337 | /* Safety check */ | |
1338 | if (attr == NULL || domain == NULL) { | |
1339 | return; | |
1340 | } | |
1341 | ||
eacaa7a6 DS |
1342 | memset(attr, 0, sizeof(struct lttng_channel_attr)); |
1343 | ||
0a9c6494 DG |
1344 | /* Same for all domains. */ |
1345 | attr->overwrite = DEFAULT_CHANNEL_OVERWRITE; | |
1346 | attr->tracefile_size = DEFAULT_CHANNEL_TRACEFILE_SIZE; | |
1347 | attr->tracefile_count = DEFAULT_CHANNEL_TRACEFILE_COUNT; | |
1348 | ||
5edd7e09 DG |
1349 | switch (domain->type) { |
1350 | case LTTNG_DOMAIN_KERNEL: | |
d92ff3ef DG |
1351 | attr->switch_timer_interval = DEFAULT_KERNEL_CHANNEL_SWITCH_TIMER; |
1352 | attr->read_timer_interval = DEFAULT_KERNEL_CHANNEL_READ_TIMER; | |
3e230f92 | 1353 | attr->subbuf_size = default_get_kernel_channel_subbuf_size(); |
5edd7e09 DG |
1354 | attr->num_subbuf = DEFAULT_KERNEL_CHANNEL_SUBBUF_NUM; |
1355 | attr->output = DEFAULT_KERNEL_CHANNEL_OUTPUT; | |
1356 | break; | |
1357 | case LTTNG_DOMAIN_UST: | |
0a9c6494 DG |
1358 | switch (domain->buf_type) { |
1359 | case LTTNG_BUFFER_PER_UID: | |
1360 | attr->subbuf_size = default_get_ust_uid_channel_subbuf_size(); | |
1361 | attr->num_subbuf = DEFAULT_UST_UID_CHANNEL_SUBBUF_NUM; | |
1362 | attr->output = DEFAULT_UST_UID_CHANNEL_OUTPUT; | |
1363 | attr->switch_timer_interval = DEFAULT_UST_UID_CHANNEL_SWITCH_TIMER; | |
1364 | attr->read_timer_interval = DEFAULT_UST_UID_CHANNEL_READ_TIMER; | |
1365 | break; | |
1366 | case LTTNG_BUFFER_PER_PID: | |
1367 | default: | |
1368 | attr->subbuf_size = default_get_ust_pid_channel_subbuf_size(); | |
1369 | attr->num_subbuf = DEFAULT_UST_PID_CHANNEL_SUBBUF_NUM; | |
1370 | attr->output = DEFAULT_UST_PID_CHANNEL_OUTPUT; | |
1371 | attr->switch_timer_interval = DEFAULT_UST_PID_CHANNEL_SWITCH_TIMER; | |
1372 | attr->read_timer_interval = DEFAULT_UST_PID_CHANNEL_READ_TIMER; | |
1373 | break; | |
1374 | } | |
5edd7e09 | 1375 | default: |
441c16a7 | 1376 | /* Default behavior: leave set to 0. */ |
5edd7e09 DG |
1377 | break; |
1378 | } | |
1379 | } | |
1380 | ||
fac6795d | 1381 | /* |
2269e89e | 1382 | * Check if session daemon is alive. |
fac6795d | 1383 | * |
2269e89e | 1384 | * Return 1 if alive or 0 if not. |
1c8d13c8 | 1385 | * On error returns a negative value. |
fac6795d | 1386 | */ |
947308c4 | 1387 | int lttng_session_daemon_alive(void) |
fac6795d DG |
1388 | { |
1389 | int ret; | |
1390 | ||
1391 | ret = set_session_daemon_path(); | |
1392 | if (ret < 0) { | |
947308c4 | 1393 | /* Error */ |
fac6795d DG |
1394 | return ret; |
1395 | } | |
1396 | ||
9d035200 | 1397 | if (*sessiond_sock_path == '\0') { |
2f70b271 DG |
1398 | /* |
1399 | * No socket path set. Weird error which means the constructor was not | |
1400 | * called. | |
1401 | */ | |
1402 | assert(0); | |
fac6795d DG |
1403 | } |
1404 | ||
2269e89e | 1405 | ret = try_connect_sessiond(sessiond_sock_path); |
7d8234d9 MD |
1406 | if (ret < 0) { |
1407 | /* Not alive */ | |
1408 | return 0; | |
1409 | } | |
7d8234d9 | 1410 | |
947308c4 DG |
1411 | /* Is alive */ |
1412 | return 1; | |
fac6795d DG |
1413 | } |
1414 | ||
00e2e675 | 1415 | /* |
a4b92340 | 1416 | * Set URL for a consumer for a session and domain. |
00e2e675 DG |
1417 | * |
1418 | * Return 0 on success, else a negative value. | |
1419 | */ | |
a4b92340 DG |
1420 | int lttng_set_consumer_url(struct lttng_handle *handle, |
1421 | const char *control_url, const char *data_url) | |
00e2e675 | 1422 | { |
3dd05a85 | 1423 | int ret; |
a4b92340 | 1424 | ssize_t size; |
00e2e675 | 1425 | struct lttcomm_session_msg lsm; |
a4b92340 | 1426 | struct lttng_uri *uris = NULL; |
00e2e675 | 1427 | |
a4b92340 | 1428 | if (handle == NULL || (control_url == NULL && data_url == NULL)) { |
2f70b271 | 1429 | return -LTTNG_ERR_INVALID; |
00e2e675 DG |
1430 | } |
1431 | ||
a4b92340 DG |
1432 | memset(&lsm, 0, sizeof(lsm)); |
1433 | ||
00e2e675 DG |
1434 | lsm.cmd_type = LTTNG_SET_CONSUMER_URI; |
1435 | ||
cac3069d | 1436 | lttng_ctl_copy_string(lsm.session.name, handle->session_name, |
00e2e675 | 1437 | sizeof(lsm.session.name)); |
cac3069d | 1438 | lttng_ctl_copy_lttng_domain(&lsm.domain, &handle->domain); |
00e2e675 | 1439 | |
bc894455 | 1440 | size = uri_parse_str_urls(control_url, data_url, &uris); |
a4b92340 | 1441 | if (size < 0) { |
2f70b271 | 1442 | return -LTTNG_ERR_INVALID; |
a4b92340 DG |
1443 | } |
1444 | ||
1445 | lsm.u.uri.size = size; | |
00e2e675 | 1446 | |
cac3069d DG |
1447 | ret = lttng_ctl_ask_sessiond_varlen(&lsm, uris, |
1448 | sizeof(struct lttng_uri) * size, NULL); | |
3dd05a85 DG |
1449 | |
1450 | free(uris); | |
1451 | return ret; | |
00e2e675 DG |
1452 | } |
1453 | ||
1454 | /* | |
9c6bda17 | 1455 | * [OBSOLETE] |
00e2e675 DG |
1456 | */ |
1457 | int lttng_enable_consumer(struct lttng_handle *handle) | |
1458 | { | |
785d2d0d | 1459 | return -ENOSYS; |
00e2e675 DG |
1460 | } |
1461 | ||
1462 | /* | |
9c6bda17 | 1463 | * [OBSOLETE] |
00e2e675 DG |
1464 | */ |
1465 | int lttng_disable_consumer(struct lttng_handle *handle) | |
1466 | { | |
785d2d0d | 1467 | return -ENOSYS; |
00e2e675 DG |
1468 | } |
1469 | ||
07424f16 DG |
1470 | /* |
1471 | * This is an extension of create session that is ONLY and SHOULD only be used | |
1472 | * by the lttng command line program. It exists to avoid using URI parsing in | |
1473 | * the lttng client. | |
1474 | * | |
1475 | * We need the date and time for the trace path subdirectory for the case where | |
1476 | * the user does NOT define one using either -o or -U. Using the normal | |
1477 | * lttng_create_session API call, we have no clue on the session daemon side if | |
1478 | * the URL was generated automatically by the client or define by the user. | |
1479 | * | |
1480 | * So this function "wrapper" is hidden from the public API, takes the datetime | |
1481 | * string and appends it if necessary to the URI subdirectory before sending it | |
1482 | * to the session daemon. | |
1483 | * | |
1484 | * With this extra function, the lttng_create_session call behavior is not | |
1485 | * changed and the timestamp is appended to the URI on the session daemon side | |
1486 | * if necessary. | |
1487 | */ | |
1488 | int _lttng_create_session_ext(const char *name, const char *url, | |
1489 | const char *datetime) | |
1490 | { | |
3dd05a85 | 1491 | int ret; |
07424f16 DG |
1492 | ssize_t size; |
1493 | struct lttcomm_session_msg lsm; | |
1494 | struct lttng_uri *uris = NULL; | |
1495 | ||
2bba9e53 | 1496 | if (name == NULL || datetime == NULL) { |
2f70b271 | 1497 | return -LTTNG_ERR_INVALID; |
07424f16 DG |
1498 | } |
1499 | ||
1500 | memset(&lsm, 0, sizeof(lsm)); | |
1501 | ||
1502 | lsm.cmd_type = LTTNG_CREATE_SESSION; | |
cac3069d | 1503 | lttng_ctl_copy_string(lsm.session.name, name, sizeof(lsm.session.name)); |
07424f16 DG |
1504 | |
1505 | /* There should never be a data URL */ | |
bc894455 | 1506 | size = uri_parse_str_urls(url, NULL, &uris); |
07424f16 | 1507 | if (size < 0) { |
3dd05a85 DG |
1508 | ret = -LTTNG_ERR_INVALID; |
1509 | goto error; | |
07424f16 DG |
1510 | } |
1511 | ||
1512 | lsm.u.uri.size = size; | |
1513 | ||
4b35a6b3 | 1514 | if (size > 0 && uris[0].dtype != LTTNG_DST_PATH && strlen(uris[0].subdir) == 0) { |
da4aa2b8 DG |
1515 | /* Don't append datetime if the name was automatically created. */ |
1516 | if (strncmp(name, DEFAULT_SESSION_NAME "-", | |
1517 | strlen(DEFAULT_SESSION_NAME) + 1)) { | |
1518 | ret = snprintf(uris[0].subdir, sizeof(uris[0].subdir), "%s-%s", | |
1519 | name, datetime); | |
1520 | } else { | |
1521 | ret = snprintf(uris[0].subdir, sizeof(uris[0].subdir), "%s", name); | |
1522 | } | |
07424f16 DG |
1523 | if (ret < 0) { |
1524 | PERROR("snprintf uri subdir"); | |
3dd05a85 DG |
1525 | ret = -LTTNG_ERR_FATAL; |
1526 | goto error; | |
07424f16 DG |
1527 | } |
1528 | } | |
1529 | ||
cac3069d DG |
1530 | ret = lttng_ctl_ask_sessiond_varlen(&lsm, uris, |
1531 | sizeof(struct lttng_uri) * size, NULL); | |
3dd05a85 DG |
1532 | |
1533 | error: | |
1534 | free(uris); | |
1535 | return ret; | |
07424f16 DG |
1536 | } |
1537 | ||
806e2684 DG |
1538 | /* |
1539 | * For a given session name, this call checks if the data is ready to be read | |
1540 | * or is still being extracted by the consumer(s) hence not ready to be used by | |
1541 | * any readers. | |
1542 | */ | |
6d805429 | 1543 | int lttng_data_pending(const char *session_name) |
806e2684 DG |
1544 | { |
1545 | int ret; | |
1546 | struct lttcomm_session_msg lsm; | |
1547 | ||
1548 | if (session_name == NULL) { | |
1549 | return -LTTNG_ERR_INVALID; | |
1550 | } | |
1551 | ||
239f3aec | 1552 | memset(&lsm, 0, sizeof(lsm)); |
6d805429 | 1553 | lsm.cmd_type = LTTNG_DATA_PENDING; |
806e2684 | 1554 | |
cac3069d DG |
1555 | lttng_ctl_copy_string(lsm.session.name, session_name, |
1556 | sizeof(lsm.session.name)); | |
806e2684 | 1557 | |
cac3069d | 1558 | ret = lttng_ctl_ask_sessiond(&lsm, NULL); |
806e2684 DG |
1559 | |
1560 | /* | |
cac3069d DG |
1561 | * The lttng_ctl_ask_sessiond function negate the return code if it's not |
1562 | * LTTNG_OK so getting -1 means that the reply ret_code was 1 thus meaning | |
1563 | * that the data is available. Yes it is hackish but for now this is the | |
1564 | * only way. | |
806e2684 DG |
1565 | */ |
1566 | if (ret == -1) { | |
1567 | ret = 1; | |
1568 | } | |
1569 | ||
1570 | return ret; | |
1571 | } | |
1572 | ||
27babd3a DG |
1573 | /* |
1574 | * Create a session exclusively used for snapshot. | |
1575 | * | |
1576 | * Returns LTTNG_OK on success or a negative error code. | |
1577 | */ | |
1578 | int lttng_create_session_snapshot(const char *name, const char *snapshot_url) | |
1579 | { | |
1580 | int ret; | |
1581 | ssize_t size; | |
1582 | struct lttcomm_session_msg lsm; | |
1583 | struct lttng_uri *uris = NULL; | |
1584 | ||
1585 | if (name == NULL) { | |
1586 | return -LTTNG_ERR_INVALID; | |
1587 | } | |
1588 | ||
1589 | memset(&lsm, 0, sizeof(lsm)); | |
1590 | ||
1591 | lsm.cmd_type = LTTNG_CREATE_SESSION_SNAPSHOT; | |
1592 | lttng_ctl_copy_string(lsm.session.name, name, sizeof(lsm.session.name)); | |
1593 | ||
1594 | size = uri_parse_str_urls(snapshot_url, NULL, &uris); | |
1595 | if (size < 0) { | |
1596 | return -LTTNG_ERR_INVALID; | |
1597 | } | |
1598 | ||
1599 | lsm.u.uri.size = size; | |
1600 | ||
1601 | ret = lttng_ctl_ask_sessiond_varlen(&lsm, uris, | |
1602 | sizeof(struct lttng_uri) * size, NULL); | |
1603 | ||
1604 | free(uris); | |
1605 | return ret; | |
1606 | } | |
1607 | ||
ecc48a90 JD |
1608 | /* |
1609 | * Create a session exclusively used for live. | |
1610 | * | |
1611 | * Returns LTTNG_OK on success or a negative error code. | |
1612 | */ | |
1613 | int lttng_create_session_live(const char *name, const char *url, | |
1614 | unsigned int timer_interval) | |
1615 | { | |
1616 | int ret; | |
1617 | ssize_t size; | |
1618 | struct lttcomm_session_msg lsm; | |
1619 | struct lttng_uri *uris = NULL; | |
1620 | ||
1621 | if (name == NULL) { | |
1622 | return -LTTNG_ERR_INVALID; | |
1623 | } | |
1624 | ||
1625 | memset(&lsm, 0, sizeof(lsm)); | |
1626 | ||
1627 | lsm.cmd_type = LTTNG_CREATE_SESSION_LIVE; | |
1628 | lttng_ctl_copy_string(lsm.session.name, name, sizeof(lsm.session.name)); | |
1629 | ||
d6e4c56b DG |
1630 | if (url) { |
1631 | size = uri_parse_str_urls(url, NULL, &uris); | |
1632 | if (size <= 0) { | |
1633 | ret = -LTTNG_ERR_INVALID; | |
1634 | goto end; | |
1635 | } | |
ecc48a90 | 1636 | |
d6e4c56b DG |
1637 | /* file:// is not accepted for live session. */ |
1638 | if (uris[0].dtype == LTTNG_DST_PATH) { | |
1639 | ret = -LTTNG_ERR_INVALID; | |
1640 | goto end; | |
1641 | } | |
1642 | } else { | |
1643 | size = 0; | |
ecc48a90 JD |
1644 | } |
1645 | ||
1646 | lsm.u.session_live.nb_uri = size; | |
1647 | lsm.u.session_live.timer_interval = timer_interval; | |
1648 | ||
1649 | ret = lttng_ctl_ask_sessiond_varlen(&lsm, uris, | |
1650 | sizeof(struct lttng_uri) * size, NULL); | |
1651 | ||
1652 | end: | |
1653 | free(uris); | |
1654 | return ret; | |
1655 | } | |
1656 | ||
fac6795d DG |
1657 | /* |
1658 | * lib constructor | |
1659 | */ | |
1660 | static void __attribute__((constructor)) init() | |
1661 | { | |
1662 | /* Set default session group */ | |
bbccc3d2 | 1663 | lttng_set_tracing_group(DEFAULT_TRACING_GROUP); |
fac6795d | 1664 | } |
49cca668 DG |
1665 | |
1666 | /* | |
1667 | * lib destructor | |
1668 | */ | |
1669 | static void __attribute__((destructor)) lttng_ctl_exit() | |
1670 | { | |
1671 | free(tracing_group); | |
1672 | } |