Fix: lttng list of channels should return errors
[lttng-tools.git] / src / lib / lttng-ctl / lttng-ctl.c
CommitLineData
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>
2001793c 7 * Copyright (C) 2016 - Jérémie Galarneau <jeremie.galarneau@efficios.com>
fac6795d 8 *
d14d33bf
AM
9 * This library is free software; you can redistribute it and/or modify it
10 * under the terms of the GNU Lesser General Public License, version 2.1 only,
11 * as published by the Free Software Foundation.
82a3637f
DG
12 *
13 * This library is distributed in the hope that it will be useful,
fac6795d 14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
82a3637f
DG
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 * Lesser General Public License for more details.
17 *
d14d33bf
AM
18 * You should have received a copy of the GNU Lesser General Public License
19 * along with this library; if not, write to the Free Software Foundation,
20 * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
fac6795d
DG
21 */
22
6c1c0768 23#define _LGPL_SOURCE
44a5e5eb 24#include <assert.h>
fac6795d 25#include <grp.h>
1e307fab 26#include <errno.h>
fac6795d
DG
27#include <stdio.h>
28#include <stdlib.h>
29#include <string.h>
30#include <unistd.h>
31
990570ed
DG
32#include <common/common.h>
33#include <common/defaults.h>
db758600 34#include <common/sessiond-comm/sessiond-comm.h>
a4b92340 35#include <common/uri.h>
feb0f3e5 36#include <common/utils.h>
1e307fab 37#include <lttng/lttng.h>
0c89d795 38#include <lttng/health-internal.h>
a58c490f
JG
39#include <lttng/trigger/trigger-internal.h>
40#include <lttng/endpoint.h>
41#include <lttng/channel-internal.h>
fac6795d 42
d00c599e
DG
43#include "filter/filter-ast.h"
44#include "filter/filter-parser.h"
45#include "filter/filter-bytecode.h"
46#include "filter/memstream.h"
cac3069d 47#include "lttng-ctl-helper.h"
53a80697
MD
48
49#ifdef DEBUG
d00c599e 50static const int print_xml = 1;
53a80697
MD
51#define dbg_printf(fmt, args...) \
52 printf("[debug liblttng-ctl] " fmt, ## args)
53#else
d00c599e 54static const int print_xml = 0;
53a80697
MD
55#define dbg_printf(fmt, args...) \
56do { \
57 /* do nothing but check printf format */ \
58 if (0) \
59 printf("[debug liblttnctl] " fmt, ## args); \
60} while (0)
61#endif
62
63
fac6795d
DG
64/* Socket to session daemon for communication */
65static int sessiond_socket;
66static char sessiond_sock_path[PATH_MAX];
67
fac6795d
DG
68/* Variables */
69static char *tracing_group;
70static int connected;
71
97e19046
DG
72/* Global */
73
74/*
75 * Those two variables are used by error.h to silent or control the verbosity of
76 * error message. They are global to the library so application linking with it
77 * are able to compile correctly and also control verbosity of the library.
97e19046
DG
78 */
79int lttng_opt_quiet;
80int lttng_opt_verbose;
c7e35b03 81int lttng_opt_mi;
97e19046 82
99497cd0
MD
83/*
84 * Copy string from src to dst and enforce null terminated byte.
85 */
cac3069d
DG
86LTTNG_HIDDEN
87void lttng_ctl_copy_string(char *dst, const char *src, size_t len)
99497cd0 88{
e7d6716d 89 if (src && dst) {
99497cd0
MD
90 strncpy(dst, src, len);
91 /* Enforce the NULL terminated byte */
92 dst[len - 1] = '\0';
cd80958d
DG
93 } else if (dst) {
94 dst[0] = '\0';
99497cd0
MD
95 }
96}
97
fac6795d 98/*
cd80958d 99 * Copy domain to lttcomm_session_msg domain.
fac6795d 100 *
cd80958d
DG
101 * If domain is unknown, default domain will be the kernel.
102 */
cac3069d
DG
103LTTNG_HIDDEN
104void lttng_ctl_copy_lttng_domain(struct lttng_domain *dst,
105 struct lttng_domain *src)
cd80958d
DG
106{
107 if (src && dst) {
108 switch (src->type) {
00e2e675
DG
109 case LTTNG_DOMAIN_KERNEL:
110 case LTTNG_DOMAIN_UST:
b9dfb167 111 case LTTNG_DOMAIN_JUL:
5cdb6027 112 case LTTNG_DOMAIN_LOG4J:
0e115563 113 case LTTNG_DOMAIN_PYTHON:
00e2e675
DG
114 memcpy(dst, src, sizeof(struct lttng_domain));
115 break;
116 default:
117 memset(dst, 0, sizeof(struct lttng_domain));
00e2e675 118 break;
cd80958d
DG
119 }
120 }
121}
122
123/*
124 * Send lttcomm_session_msg to the session daemon.
fac6795d 125 *
1c8d13c8
TD
126 * On success, returns the number of bytes sent (>=0)
127 * On error, returns -1
fac6795d 128 */
cd80958d 129static int send_session_msg(struct lttcomm_session_msg *lsm)
fac6795d
DG
130{
131 int ret;
132
133 if (!connected) {
2f70b271 134 ret = -LTTNG_ERR_NO_SESSIOND;
e065084a 135 goto end;
fac6795d
DG
136 }
137
a4b92340
DG
138 DBG("LSM cmd type : %d", lsm->cmd_type);
139
be040666 140 ret = lttcomm_send_creds_unix_sock(sessiond_socket, lsm,
cd80958d 141 sizeof(struct lttcomm_session_msg));
2f70b271
DG
142 if (ret < 0) {
143 ret = -LTTNG_ERR_FATAL;
144 }
e065084a
DG
145
146end:
147 return ret;
148}
149
53a80697
MD
150/*
151 * Send var len data to the session daemon.
152 *
153 * On success, returns the number of bytes sent (>=0)
154 * On error, returns -1
155 */
c2d69327 156static int send_session_varlen(const void *data, size_t len)
53a80697
MD
157{
158 int ret;
159
160 if (!connected) {
2f70b271 161 ret = -LTTNG_ERR_NO_SESSIOND;
53a80697
MD
162 goto end;
163 }
a4b92340 164
53a80697
MD
165 if (!data || !len) {
166 ret = 0;
167 goto end;
168 }
169
170 ret = lttcomm_send_unix_sock(sessiond_socket, data, len);
2f70b271
DG
171 if (ret < 0) {
172 ret = -LTTNG_ERR_FATAL;
173 }
53a80697
MD
174
175end:
176 return ret;
177}
178
e065084a 179/*
cd80958d 180 * Receive data from the sessiond socket.
e065084a 181 *
1c8d13c8
TD
182 * On success, returns the number of bytes received (>=0)
183 * On error, returns -1 (recvmsg() error) or -ENOTCONN
e065084a 184 */
ca95a216 185static int recv_data_sessiond(void *buf, size_t len)
e065084a
DG
186{
187 int ret;
188
189 if (!connected) {
2f70b271 190 ret = -LTTNG_ERR_NO_SESSIOND;
e065084a 191 goto end;
fac6795d
DG
192 }
193
ca95a216 194 ret = lttcomm_recv_unix_sock(sessiond_socket, buf, len);
2f70b271
DG
195 if (ret < 0) {
196 ret = -LTTNG_ERR_FATAL;
197 }
fac6795d 198
e065084a 199end:
fac6795d
DG
200 return ret;
201}
202
203/*
9ae110e2 204 * Check if we are in the specified group.
65beb5ff 205 *
9ae110e2 206 * If yes return 1, else return -1.
947308c4 207 */
6c71277b
MD
208LTTNG_HIDDEN
209int lttng_check_tracing_group(void)
947308c4
DG
210{
211 struct group *grp_tracing; /* no free(). See getgrnam(3) */
212 gid_t *grp_list;
213 int grp_list_size, grp_id, i;
214 int ret = -1;
6c71277b 215 const char *grp_name = tracing_group;
947308c4
DG
216
217 /* Get GID of group 'tracing' */
218 grp_tracing = getgrnam(grp_name);
b4d8603b
MD
219 if (!grp_tracing) {
220 /* If grp_tracing is NULL, the group does not exist. */
947308c4
DG
221 goto end;
222 }
223
224 /* Get number of supplementary group IDs */
225 grp_list_size = getgroups(0, NULL);
226 if (grp_list_size < 0) {
6f04ed72 227 PERROR("getgroups");
947308c4
DG
228 goto end;
229 }
230
231 /* Alloc group list of the right size */
3f451dc0 232 grp_list = zmalloc(grp_list_size * sizeof(gid_t));
00795392 233 if (!grp_list) {
6f04ed72 234 PERROR("malloc");
00795392
MD
235 goto end;
236 }
947308c4 237 grp_id = getgroups(grp_list_size, grp_list);
1c8d13c8 238 if (grp_id < 0) {
6f04ed72 239 PERROR("getgroups");
947308c4
DG
240 goto free_list;
241 }
242
243 for (i = 0; i < grp_list_size; i++) {
244 if (grp_list[i] == grp_tracing->gr_gid) {
2269e89e 245 ret = 1;
947308c4
DG
246 break;
247 }
248 }
249
250free_list:
251 free(grp_list);
252
253end:
254 return ret;
255}
256
257/*
2269e89e
DG
258 * Try connect to session daemon with sock_path.
259 *
260 * Return 0 on success, else -1
261 */
262static int try_connect_sessiond(const char *sock_path)
263{
264 int ret;
265
266 /* If socket exist, we check if the daemon listens for connect. */
267 ret = access(sock_path, F_OK);
268 if (ret < 0) {
269 /* Not alive */
2f70b271 270 goto error;
2269e89e
DG
271 }
272
273 ret = lttcomm_connect_unix_sock(sock_path);
274 if (ret < 0) {
9ae110e2 275 /* Not alive. */
2f70b271 276 goto error;
2269e89e
DG
277 }
278
279 ret = lttcomm_close_unix_sock(ret);
280 if (ret < 0) {
6f04ed72 281 PERROR("lttcomm_close_unix_sock");
2269e89e
DG
282 }
283
284 return 0;
2f70b271
DG
285
286error:
287 return -1;
2269e89e
DG
288}
289
290/*
2f70b271
DG
291 * Set sessiond socket path by putting it in the global sessiond_sock_path
292 * variable.
293 *
294 * Returns 0 on success, negative value on failure (the sessiond socket path
295 * is somehow too long or ENOMEM).
947308c4
DG
296 */
297static int set_session_daemon_path(void)
298{
9ae110e2 299 int in_tgroup = 0; /* In tracing group. */
2269e89e
DG
300 uid_t uid;
301
302 uid = getuid();
947308c4 303
2269e89e
DG
304 if (uid != 0) {
305 /* Are we in the tracing group ? */
6c71277b 306 in_tgroup = lttng_check_tracing_group();
2269e89e
DG
307 }
308
08a9c49f 309 if ((uid == 0) || in_tgroup) {
cac3069d
DG
310 lttng_ctl_copy_string(sessiond_sock_path,
311 DEFAULT_GLOBAL_CLIENT_UNIX_SOCK, sizeof(sessiond_sock_path));
08a9c49f 312 }
2269e89e 313
08a9c49f 314 if (uid != 0) {
c617c0c6
MD
315 int ret;
316
08a9c49f 317 if (in_tgroup) {
9ae110e2 318 /* Tracing group. */
08a9c49f
TD
319 ret = try_connect_sessiond(sessiond_sock_path);
320 if (ret >= 0) {
321 goto end;
2269e89e 322 }
08a9c49f 323 /* Global session daemon not available... */
2269e89e 324 }
08a9c49f
TD
325 /* ...or not in tracing group (and not root), default */
326
327 /*
9ae110e2
JG
328 * With GNU C < 2.1, snprintf returns -1 if the target buffer
329 * is too small;
330 * With GNU C >= 2.1, snprintf returns the required size
331 * (excluding closing null)
08a9c49f
TD
332 */
333 ret = snprintf(sessiond_sock_path, sizeof(sessiond_sock_path),
feb0f3e5 334 DEFAULT_HOME_CLIENT_UNIX_SOCK, utils_get_home_dir());
08a9c49f 335 if ((ret < 0) || (ret >= sizeof(sessiond_sock_path))) {
2f70b271 336 goto error;
947308c4 337 }
947308c4 338 }
08a9c49f 339end:
947308c4 340 return 0;
2f70b271
DG
341
342error:
343 return -1;
947308c4
DG
344}
345
65beb5ff 346/*
9ae110e2 347 * Connect to the LTTng session daemon.
65beb5ff 348 *
9ae110e2 349 * On success, return 0. On error, return -1.
65beb5ff
DG
350 */
351static int connect_sessiond(void)
352{
353 int ret;
354
da3c9ec1
DG
355 /* Don't try to connect if already connected. */
356 if (connected) {
357 return 0;
358 }
359
65beb5ff
DG
360 ret = set_session_daemon_path();
361 if (ret < 0) {
2f70b271 362 goto error;
65beb5ff
DG
363 }
364
9ae110e2 365 /* Connect to the sesssion daemon. */
65beb5ff
DG
366 ret = lttcomm_connect_unix_sock(sessiond_sock_path);
367 if (ret < 0) {
2f70b271 368 goto error;
65beb5ff
DG
369 }
370
371 sessiond_socket = ret;
372 connected = 1;
373
374 return 0;
2f70b271
DG
375
376error:
377 return -1;
65beb5ff
DG
378}
379
380/*
1c8d13c8 381 * Clean disconnect from the session daemon.
9ae110e2 382 *
1c8d13c8 383 * On success, return 0. On error, return -1.
65beb5ff
DG
384 */
385static int disconnect_sessiond(void)
386{
387 int ret = 0;
388
389 if (connected) {
390 ret = lttcomm_close_unix_sock(sessiond_socket);
391 sessiond_socket = 0;
392 connected = 0;
393 }
394
395 return ret;
396}
397
795a978d
PP
398static int recv_sessiond_optional_data(size_t len, void **user_buf,
399 size_t *user_len)
400{
401 int ret = 0;
402 void *buf = NULL;
403
404 if (len) {
405 if (!user_len) {
406 ret = -LTTNG_ERR_INVALID;
407 goto end;
408 }
409
410 buf = zmalloc(len);
411 if (!buf) {
412 ret = -ENOMEM;
413 goto end;
414 }
415
416 ret = recv_data_sessiond(buf, len);
417 if (ret < 0) {
418 goto end;
419 }
420
421 if (!user_buf) {
422 ret = -LTTNG_ERR_INVALID;
423 goto end;
424 }
425
426 /* Move ownership of command header buffer to user. */
427 *user_buf = buf;
428 buf = NULL;
429 *user_len = len;
430 } else {
431 /* No command header. */
432 if (user_len) {
433 *user_len = 0;
434 }
435
436 if (user_buf) {
437 *user_buf = NULL;
438 }
439 }
440
441end:
442 free(buf);
443 return ret;
444}
445
35a6fdb7 446/*
cd80958d 447 * Ask the session daemon a specific command and put the data into buf.
53a80697 448 * Takes extra var. len. data as input to send to the session daemon.
65beb5ff 449 *
af87c45a 450 * Return size of data (only payload, not header) or a negative error code.
65beb5ff 451 */
cac3069d
DG
452LTTNG_HIDDEN
453int lttng_ctl_ask_sessiond_varlen(struct lttcomm_session_msg *lsm,
795a978d
PP
454 const void *vardata, size_t vardata_len,
455 void **user_payload_buf, void **user_cmd_header_buf,
456 size_t *user_cmd_header_len)
65beb5ff
DG
457{
458 int ret;
795a978d 459 size_t payload_len;
cd80958d 460 struct lttcomm_lttng_msg llm;
65beb5ff
DG
461
462 ret = connect_sessiond();
463 if (ret < 0) {
2f70b271 464 ret = -LTTNG_ERR_NO_SESSIOND;
65beb5ff
DG
465 goto end;
466 }
467
65beb5ff 468 /* Send command to session daemon */
cd80958d 469 ret = send_session_msg(lsm);
65beb5ff 470 if (ret < 0) {
2f70b271 471 /* Ret value is a valid lttng error code. */
65beb5ff
DG
472 goto end;
473 }
53a80697 474 /* Send var len data */
795a978d 475 ret = send_session_varlen(vardata, vardata_len);
53a80697 476 if (ret < 0) {
2f70b271 477 /* Ret value is a valid lttng error code. */
53a80697
MD
478 goto end;
479 }
65beb5ff
DG
480
481 /* Get header from data transmission */
482 ret = recv_data_sessiond(&llm, sizeof(llm));
483 if (ret < 0) {
2f70b271 484 /* Ret value is a valid lttng error code. */
65beb5ff
DG
485 goto end;
486 }
487
488 /* Check error code if OK */
f73fabfd 489 if (llm.ret_code != LTTNG_OK) {
65beb5ff
DG
490 ret = -llm.ret_code;
491 goto end;
492 }
493
795a978d
PP
494 /* Get command header from data transmission */
495 ret = recv_sessiond_optional_data(llm.cmd_header_size,
496 user_cmd_header_buf, user_cmd_header_len);
65beb5ff 497 if (ret < 0) {
65beb5ff
DG
498 goto end;
499 }
500
795a978d
PP
501 /* Get payload from data transmission */
502 ret = recv_sessiond_optional_data(llm.data_size, user_payload_buf,
503 &payload_len);
504 if (ret < 0) {
83009e5e
DG
505 goto end;
506 }
507
795a978d 508 ret = llm.data_size;
65beb5ff
DG
509
510end:
511 disconnect_sessiond();
512 return ret;
513}
514
9f19cc17 515/*
cd80958d 516 * Create lttng handle and return pointer.
9ae110e2 517 *
1c8d13c8 518 * The returned pointer will be NULL in case of malloc() error.
9f19cc17 519 */
cd80958d
DG
520struct lttng_handle *lttng_create_handle(const char *session_name,
521 struct lttng_domain *domain)
9f19cc17 522{
2f70b271
DG
523 struct lttng_handle *handle = NULL;
524
3f451dc0 525 handle = zmalloc(sizeof(struct lttng_handle));
cd80958d 526 if (handle == NULL) {
2f70b271 527 PERROR("malloc handle");
cd80958d
DG
528 goto end;
529 }
530
531 /* Copy session name */
cac3069d 532 lttng_ctl_copy_string(handle->session_name, session_name,
cd80958d
DG
533 sizeof(handle->session_name));
534
95681498
JG
535 /* Copy lttng domain or leave initialized to 0. */
536 if (domain) {
537 lttng_ctl_copy_lttng_domain(&handle->domain, domain);
538 }
cd80958d
DG
539
540end:
541 return handle;
542}
543
544/*
545 * Destroy handle by free(3) the pointer.
546 */
547void lttng_destroy_handle(struct lttng_handle *handle)
548{
0e428499 549 free(handle);
eb354453
DG
550}
551
d9800920
DG
552/*
553 * Register an outside consumer.
9ae110e2 554 *
1c8d13c8 555 * Returns size of returned session payload data or a negative error code.
d9800920
DG
556 */
557int lttng_register_consumer(struct lttng_handle *handle,
558 const char *socket_path)
559{
560 struct lttcomm_session_msg lsm;
561
2f70b271
DG
562 if (handle == NULL || socket_path == NULL) {
563 return -LTTNG_ERR_INVALID;
564 }
565
53efb85a 566 memset(&lsm, 0, sizeof(lsm));
d9800920 567 lsm.cmd_type = LTTNG_REGISTER_CONSUMER;
cac3069d 568 lttng_ctl_copy_string(lsm.session.name, handle->session_name,
d9800920 569 sizeof(lsm.session.name));
cac3069d 570 lttng_ctl_copy_lttng_domain(&lsm.domain, &handle->domain);
d9800920 571
9ae110e2
JG
572 lttng_ctl_copy_string(lsm.u.reg.path, socket_path,
573 sizeof(lsm.u.reg.path));
d9800920 574
cac3069d 575 return lttng_ctl_ask_sessiond(&lsm, NULL);
d9800920
DG
576}
577
1df4dedd 578/*
9ae110e2
JG
579 * Start tracing for all traces of the session.
580 *
581 * Returns size of returned session payload data or a negative error code.
1df4dedd 582 */
6a4f824d 583int lttng_start_tracing(const char *session_name)
f3ed775e 584{
cd80958d
DG
585 struct lttcomm_session_msg lsm;
586
6a4f824d 587 if (session_name == NULL) {
2f70b271 588 return -LTTNG_ERR_INVALID;
cd80958d
DG
589 }
590
53efb85a 591 memset(&lsm, 0, sizeof(lsm));
cd80958d 592 lsm.cmd_type = LTTNG_START_TRACE;
6a4f824d 593
cac3069d
DG
594 lttng_ctl_copy_string(lsm.session.name, session_name,
595 sizeof(lsm.session.name));
cd80958d 596
cac3069d 597 return lttng_ctl_ask_sessiond(&lsm, NULL);
f3ed775e 598}
1df4dedd
DG
599
600/*
38ee087f 601 * Stop tracing for all traces of the session.
f3ed775e 602 */
38ee087f 603static int _lttng_stop_tracing(const char *session_name, int wait)
f3ed775e 604{
38ee087f 605 int ret, data_ret;
cd80958d
DG
606 struct lttcomm_session_msg lsm;
607
6a4f824d 608 if (session_name == NULL) {
2f70b271 609 return -LTTNG_ERR_INVALID;
6a4f824d
DG
610 }
611
53efb85a 612 memset(&lsm, 0, sizeof(lsm));
cd80958d 613 lsm.cmd_type = LTTNG_STOP_TRACE;
6a4f824d 614
cac3069d
DG
615 lttng_ctl_copy_string(lsm.session.name, session_name,
616 sizeof(lsm.session.name));
cd80958d 617
cac3069d 618 ret = lttng_ctl_ask_sessiond(&lsm, NULL);
38ee087f
DG
619 if (ret < 0 && ret != -LTTNG_ERR_TRACE_ALREADY_STOPPED) {
620 goto error;
621 }
622
623 if (!wait) {
624 goto end;
625 }
626
38ee087f
DG
627 /* Check for data availability */
628 do {
6d805429 629 data_ret = lttng_data_pending(session_name);
38ee087f
DG
630 if (data_ret < 0) {
631 /* Return the data available call error. */
632 ret = data_ret;
633 goto error;
634 }
635
636 /*
9ae110e2
JG
637 * Data sleep time before retrying (in usec). Don't sleep if the
638 * call returned value indicates availability.
38ee087f 639 */
6d805429 640 if (data_ret) {
38ee087f 641 usleep(DEFAULT_DATA_AVAILABILITY_WAIT_TIME);
38ee087f 642 }
6d805429 643 } while (data_ret != 0);
38ee087f 644
38ee087f
DG
645end:
646error:
647 return ret;
648}
649
650/*
651 * Stop tracing and wait for data availability.
652 */
653int lttng_stop_tracing(const char *session_name)
654{
655 return _lttng_stop_tracing(session_name, 1);
656}
657
658/*
659 * Stop tracing but _don't_ wait for data availability.
660 */
661int lttng_stop_tracing_no_wait(const char *session_name)
662{
663 return _lttng_stop_tracing(session_name, 0);
f3ed775e
DG
664}
665
666/*
601d5acf
DG
667 * Add context to a channel.
668 *
669 * If the given channel is NULL, add the contexts to all channels.
670 * The event_name param is ignored.
af87c45a
DG
671 *
672 * Returns the size of the returned payload data or a negative error code.
1df4dedd 673 */
cd80958d 674int lttng_add_context(struct lttng_handle *handle,
38057ed1
DG
675 struct lttng_event_context *ctx, const char *event_name,
676 const char *channel_name)
d65106b1 677{
2001793c
JG
678 int ret;
679 size_t len = 0;
680 char *buf = NULL;
cd80958d
DG
681 struct lttcomm_session_msg lsm;
682
9ae110e2 683 /* Safety check. Both are mandatory. */
9d697d3d 684 if (handle == NULL || ctx == NULL) {
2001793c
JG
685 ret = -LTTNG_ERR_INVALID;
686 goto end;
cd80958d
DG
687 }
688
441c16a7 689 memset(&lsm, 0, sizeof(lsm));
cd80958d
DG
690 lsm.cmd_type = LTTNG_ADD_CONTEXT;
691
85076754
MD
692 /* If no channel name, send empty string. */
693 if (channel_name == NULL) {
694 lttng_ctl_copy_string(lsm.u.context.channel_name, "",
695 sizeof(lsm.u.context.channel_name));
696 } else {
697 lttng_ctl_copy_string(lsm.u.context.channel_name, channel_name,
698 sizeof(lsm.u.context.channel_name));
699 }
cd80958d 700
cac3069d 701 lttng_ctl_copy_lttng_domain(&lsm.domain, &handle->domain);
cac3069d 702 lttng_ctl_copy_string(lsm.session.name, handle->session_name,
cd80958d
DG
703 sizeof(lsm.session.name));
704
2001793c
JG
705 if (ctx->ctx == LTTNG_EVENT_CONTEXT_APP_CONTEXT) {
706 size_t provider_len, ctx_len;
707 const char *provider_name = ctx->u.app_ctx.provider_name;
708 const char *ctx_name = ctx->u.app_ctx.ctx_name;
709
710 if (!provider_name || !ctx_name) {
711 ret = -LTTNG_ERR_INVALID;
712 goto end;
713 }
714
715 provider_len = strlen(provider_name);
716 if (provider_len == 0) {
717 ret = -LTTNG_ERR_INVALID;
718 goto end;
719 }
720 lsm.u.context.provider_name_len = provider_len;
721
722 ctx_len = strlen(ctx_name);
723 if (ctx_len == 0) {
724 ret = -LTTNG_ERR_INVALID;
725 goto end;
726 }
727 lsm.u.context.context_name_len = ctx_len;
728
729 len = provider_len + ctx_len;
730 buf = zmalloc(len);
731 if (!buf) {
732 ret = -LTTNG_ERR_NOMEM;
733 goto end;
734 }
735
736 memcpy(buf, provider_name, provider_len);
737 memcpy(buf + provider_len, ctx_name, ctx_len);
738 }
739 memcpy(&lsm.u.context.ctx, ctx, sizeof(struct lttng_event_context));
46f44e2a
JR
740
741 if (ctx->ctx == LTTNG_EVENT_CONTEXT_APP_CONTEXT) {
742 /*
743 * Don't leak application addresses to the sessiond.
744 * This is only necessary when ctx is for an app ctx otherwise
745 * the values inside the union (type & config) are overwritten.
746 */
747 lsm.u.context.ctx.u.app_ctx.provider_name = NULL;
748 lsm.u.context.ctx.u.app_ctx.ctx_name = NULL;
749 }
2001793c 750
795a978d 751 ret = lttng_ctl_ask_sessiond_varlen_no_cmd_header(&lsm, buf, len, NULL);
2001793c
JG
752end:
753 free(buf);
754 return ret;
d65106b1
DG
755}
756
f3ed775e 757/*
9ae110e2
JG
758 * Enable event(s) for a channel.
759 *
760 * If no event name is specified, all events are enabled.
761 * If no channel name is specified, the default 'channel0' is used.
762 *
763 * Returns size of returned session payload data or a negative error code.
f3ed775e 764 */
cd80958d 765int lttng_enable_event(struct lttng_handle *handle,
38057ed1 766 struct lttng_event *ev, const char *channel_name)
1df4dedd 767{
f8a96544
JI
768 return lttng_enable_event_with_exclusions(handle, ev, channel_name,
769 NULL, 0, NULL);
1df4dedd
DG
770}
771
53a80697 772/*
025faf73 773 * Create or enable an event with a filter expression.
178191b3 774 *
53a80697
MD
775 * Return negative error value on error.
776 * Return size of returned session payload data if OK.
777 */
025faf73 778int lttng_enable_event_with_filter(struct lttng_handle *handle,
178191b3 779 struct lttng_event *event, const char *channel_name,
53a80697
MD
780 const char *filter_expression)
781{
f8a96544
JI
782 return lttng_enable_event_with_exclusions(handle, event, channel_name,
783 filter_expression, 0, NULL);
53a80697
MD
784}
785
347c5ab5 786/*
0e115563 787 * Depending on the event, return a newly allocated agent filter expression or
347c5ab5
DG
788 * NULL if not applicable.
789 *
790 * An event with NO loglevel and the name is * will return NULL.
791 */
0e115563 792static char *set_agent_filter(const char *filter, struct lttng_event *ev)
347c5ab5
DG
793{
794 int err;
0e115563 795 char *agent_filter = NULL;
347c5ab5
DG
796
797 assert(ev);
798
799 /* Don't add filter for the '*' event. */
9f449915 800 if (strcmp(ev->name, "*") != 0) {
347c5ab5 801 if (filter) {
0e115563 802 err = asprintf(&agent_filter, "(%s) && (logger_name == \"%s\")", filter,
347c5ab5
DG
803 ev->name);
804 } else {
0e115563 805 err = asprintf(&agent_filter, "logger_name == \"%s\"", ev->name);
347c5ab5
DG
806 }
807 if (err < 0) {
808 PERROR("asprintf");
6a556f7b 809 goto error;
347c5ab5
DG
810 }
811 }
812
813 /* Add loglevel filtering if any for the JUL domain. */
814 if (ev->loglevel_type != LTTNG_EVENT_LOGLEVEL_ALL) {
815 char *op;
816
817 if (ev->loglevel_type == LTTNG_EVENT_LOGLEVEL_RANGE) {
818 op = ">=";
819 } else {
820 op = "==";
821 }
822
0e115563 823 if (filter || agent_filter) {
6a556f7b
JG
824 char *new_filter;
825
fb0edb23 826 err = asprintf(&new_filter, "(%s) && (int_loglevel %s %d)",
0e115563 827 agent_filter ? agent_filter : filter, op,
347c5ab5 828 ev->loglevel);
0e115563
DG
829 if (agent_filter) {
830 free(agent_filter);
6a556f7b 831 }
0e115563 832 agent_filter = new_filter;
347c5ab5 833 } else {
0e115563 834 err = asprintf(&agent_filter, "int_loglevel %s %d", op,
347c5ab5
DG
835 ev->loglevel);
836 }
837 if (err < 0) {
838 PERROR("asprintf");
6a556f7b 839 goto error;
347c5ab5
DG
840 }
841 }
842
0e115563 843 return agent_filter;
6a556f7b 844error:
0e115563 845 free(agent_filter);
6a556f7b 846 return NULL;
347c5ab5
DG
847}
848
137b9942 849/*
ec166985 850 * Generate the filter bytecode from a given filter expression string. Put the
137b9942
DG
851 * newly allocated parser context in ctxp and populate the lsm object with the
852 * expression len.
853 *
854 * Return 0 on success else a LTTNG_ERR_* code and ctxp is untouched.
855 */
856static int generate_filter(char *filter_expression,
857 struct lttcomm_session_msg *lsm, struct filter_parser_ctx **ctxp)
858{
859 int ret;
860 struct filter_parser_ctx *ctx = NULL;
861 FILE *fmem = NULL;
862
863 assert(filter_expression);
864 assert(lsm);
865 assert(ctxp);
866
867 /*
868 * Casting const to non-const, as the underlying function will use it in
869 * read-only mode.
870 */
871 fmem = lttng_fmemopen((void *) filter_expression,
872 strlen(filter_expression), "r");
873 if (!fmem) {
874 fprintf(stderr, "Error opening memory as stream\n");
875 ret = -LTTNG_ERR_FILTER_NOMEM;
876 goto error;
877 }
878 ctx = filter_parser_ctx_alloc(fmem);
879 if (!ctx) {
880 fprintf(stderr, "Error allocating parser\n");
881 ret = -LTTNG_ERR_FILTER_NOMEM;
882 goto filter_alloc_error;
883 }
884 ret = filter_parser_ctx_append_ast(ctx);
885 if (ret) {
886 fprintf(stderr, "Parse error\n");
887 ret = -LTTNG_ERR_FILTER_INVAL;
888 goto parse_error;
889 }
890 ret = filter_visitor_set_parent(ctx);
891 if (ret) {
892 fprintf(stderr, "Set parent error\n");
893 ret = -LTTNG_ERR_FILTER_INVAL;
894 goto parse_error;
895 }
896 if (print_xml) {
897 ret = filter_visitor_print_xml(ctx, stdout, 0);
898 if (ret) {
899 fflush(stdout);
900 fprintf(stderr, "XML print error\n");
901 ret = -LTTNG_ERR_FILTER_INVAL;
902 goto parse_error;
903 }
904 }
905
906 dbg_printf("Generating IR... ");
907 fflush(stdout);
908 ret = filter_visitor_ir_generate(ctx);
909 if (ret) {
910 fprintf(stderr, "Generate IR error\n");
911 ret = -LTTNG_ERR_FILTER_INVAL;
912 goto parse_error;
913 }
914 dbg_printf("done\n");
915
916 dbg_printf("Validating IR... ");
917 fflush(stdout);
918 ret = filter_visitor_ir_check_binary_op_nesting(ctx);
919 if (ret) {
920 ret = -LTTNG_ERR_FILTER_INVAL;
921 goto parse_error;
922 }
9f449915
PP
923
924 /* Normalize globbing patterns in the expression. */
925 ret = filter_visitor_ir_normalize_glob_patterns(ctx);
926 if (ret) {
927 ret = -LTTNG_ERR_FILTER_INVAL;
928 goto parse_error;
929 }
930
9ae110e2 931 /* Validate strings used as literals in the expression. */
dcd5daf2
JG
932 ret = filter_visitor_ir_validate_string(ctx);
933 if (ret) {
934 ret = -LTTNG_ERR_FILTER_INVAL;
935 goto parse_error;
936 }
9f449915
PP
937
938 /* Validate globbing patterns in the expression. */
939 ret = filter_visitor_ir_validate_globbing(ctx);
940 if (ret) {
941 ret = -LTTNG_ERR_FILTER_INVAL;
942 goto parse_error;
943 }
944
137b9942
DG
945 dbg_printf("done\n");
946
947 dbg_printf("Generating bytecode... ");
948 fflush(stdout);
949 ret = filter_visitor_bytecode_generate(ctx);
950 if (ret) {
951 fprintf(stderr, "Generate bytecode error\n");
952 ret = -LTTNG_ERR_FILTER_INVAL;
953 goto parse_error;
954 }
955 dbg_printf("done\n");
956 dbg_printf("Size of bytecode generated: %u bytes.\n",
957 bytecode_get_len(&ctx->bytecode->b));
958
959 lsm->u.enable.bytecode_len = sizeof(ctx->bytecode->b)
960 + bytecode_get_len(&ctx->bytecode->b);
961 lsm->u.enable.expression_len = strlen(filter_expression) + 1;
962
963 /* No need to keep the memory stream. */
964 if (fclose(fmem) != 0) {
6f04ed72 965 PERROR("fclose");
137b9942
DG
966 }
967
968 *ctxp = ctx;
969 return 0;
970
971parse_error:
137b9942
DG
972 filter_ir_free(ctx);
973 filter_parser_ctx_free(ctx);
974filter_alloc_error:
975 if (fclose(fmem) != 0) {
6f04ed72 976 PERROR("fclose");
137b9942
DG
977 }
978error:
979 return ret;
980}
981
93deb080
JI
982/*
983 * Enable event(s) for a channel, possibly with exclusions and a filter.
984 * If no event name is specified, all events are enabled.
985 * If no channel name is specified, the default name is used.
986 * If filter expression is not NULL, the filter is set for the event.
987 * If exclusion count is not zero, the exclusions are set for the event.
988 * Returns size of returned session payload data or a negative error code.
989 */
990int lttng_enable_event_with_exclusions(struct lttng_handle *handle,
991 struct lttng_event *ev, const char *channel_name,
e9efbcd3 992 const char *original_filter_expression,
93deb080
JI
993 int exclusion_count, char **exclusion_list)
994{
995 struct lttcomm_session_msg lsm;
64226865 996 char *varlen_data;
93deb080 997 int ret = 0;
137b9942 998 unsigned int free_filter_expression = 0;
93deb080 999 struct filter_parser_ctx *ctx = NULL;
e9efbcd3
JG
1000 /*
1001 * Cast as non-const since we may replace the filter expression
1002 * by a dynamically allocated string. Otherwise, the original
1003 * string is not modified.
1004 */
1005 char *filter_expression = (char *) original_filter_expression;
93deb080
JI
1006
1007 if (handle == NULL || ev == NULL) {
137b9942
DG
1008 ret = -LTTNG_ERR_INVALID;
1009 goto error;
93deb080
JI
1010 }
1011
9ae110e2
JG
1012 /*
1013 * Empty filter string will always be rejected by the parser
93deb080
JI
1014 * anyway, so treat this corner-case early to eliminate
1015 * lttng_fmemopen error for 0-byte allocation.
1016 */
1017 if (filter_expression && filter_expression[0] == '\0') {
137b9942
DG
1018 ret = -LTTNG_ERR_INVALID;
1019 goto error;
93deb080
JI
1020 }
1021
1022 memset(&lsm, 0, sizeof(lsm));
1023
1024 /* If no channel name, send empty string. */
1025 if (channel_name == NULL) {
1026 lttng_ctl_copy_string(lsm.u.enable.channel_name, "",
1027 sizeof(lsm.u.enable.channel_name));
1028 } else {
1029 lttng_ctl_copy_string(lsm.u.enable.channel_name, channel_name,
1030 sizeof(lsm.u.enable.channel_name));
1031 }
1032
18a720cd
MD
1033 lsm.cmd_type = LTTNG_ENABLE_EVENT;
1034 if (ev->name[0] == '\0') {
1035 /* Enable all events */
1036 lttng_ctl_copy_string(ev->name, "*", sizeof(ev->name));
6565421f 1037 }
93deb080 1038
6565421f 1039 lttng_ctl_copy_lttng_domain(&lsm.domain, &handle->domain);
6e911cad 1040 /* FIXME: copying non-packed struct to packed struct. */
93deb080
JI
1041 memcpy(&lsm.u.enable.event, ev, sizeof(lsm.u.enable.event));
1042
1043 lttng_ctl_copy_string(lsm.session.name, handle->session_name,
1044 sizeof(lsm.session.name));
1045 lsm.u.enable.exclusion_count = exclusion_count;
1046 lsm.u.enable.bytecode_len = 0;
1047
9b21e6d5
DG
1048 /*
1049 * For the JUL domain, a filter is enforced except for the enable all
1050 * event. This is done to avoid having the event in all sessions thus
1051 * filtering by logger name.
1052 */
1053 if (exclusion_count == 0 && filter_expression == NULL &&
5cdb6027 1054 (handle->domain.type != LTTNG_DOMAIN_JUL &&
0e115563
DG
1055 handle->domain.type != LTTNG_DOMAIN_LOG4J &&
1056 handle->domain.type != LTTNG_DOMAIN_PYTHON)) {
3e1c9ff7 1057 goto ask_sessiond;
93deb080
JI
1058 }
1059
1060 /*
1061 * We have either a filter or some exclusions, so we need to set up
9ae110e2 1062 * a variable-length memory block from where to send the data.
93deb080
JI
1063 */
1064
9ae110e2 1065 /* Parse filter expression. */
5cdb6027 1066 if (filter_expression != NULL || handle->domain.type == LTTNG_DOMAIN_JUL
0e115563
DG
1067 || handle->domain.type == LTTNG_DOMAIN_LOG4J
1068 || handle->domain.type == LTTNG_DOMAIN_PYTHON) {
5cdb6027 1069 if (handle->domain.type == LTTNG_DOMAIN_JUL ||
0e115563
DG
1070 handle->domain.type == LTTNG_DOMAIN_LOG4J ||
1071 handle->domain.type == LTTNG_DOMAIN_PYTHON) {
1072 char *agent_filter;
64226865 1073
347c5ab5 1074 /* Setup JUL filter if needed. */
0e115563
DG
1075 agent_filter = set_agent_filter(filter_expression, ev);
1076 if (!agent_filter) {
137b9942 1077 if (!filter_expression) {
9ae110e2
JG
1078 /*
1079 * No JUL and no filter, just skip
1080 * everything below.
1081 */
137b9942
DG
1082 goto ask_sessiond;
1083 }
64226865
DG
1084 } else {
1085 /*
9ae110e2
JG
1086 * With an agent filter, the original filter has
1087 * been added to it thus replace the filter
1088 * expression.
64226865 1089 */
0e115563 1090 filter_expression = agent_filter;
e9efbcd3 1091 free_filter_expression = 1;
9b21e6d5 1092 }
9b21e6d5 1093 }
93deb080 1094
137b9942 1095 ret = generate_filter(filter_expression, &lsm, &ctx);
93deb080 1096 if (ret) {
137b9942 1097 goto filter_error;
93deb080 1098 }
6b453b5e
JG
1099 }
1100
1101 varlen_data = zmalloc(lsm.u.enable.bytecode_len
137b9942
DG
1102 + lsm.u.enable.expression_len
1103 + LTTNG_SYMBOL_NAME_LEN * exclusion_count);
6b453b5e
JG
1104 if (!varlen_data) {
1105 ret = -LTTNG_ERR_EXCLUSION_NOMEM;
7ca1dc6f 1106 goto mem_error;
6b453b5e 1107 }
137b9942 1108
9ae110e2 1109 /* Put exclusion names first in the data. */
6b453b5e
JG
1110 while (exclusion_count--) {
1111 strncpy(varlen_data + LTTNG_SYMBOL_NAME_LEN * exclusion_count,
0c82ac62
PP
1112 *(exclusion_list + exclusion_count),
1113 LTTNG_SYMBOL_NAME_LEN - 1);
6b453b5e 1114 }
9ae110e2 1115 /* Add filter expression next. */
6b453b5e
JG
1116 if (lsm.u.enable.expression_len != 0) {
1117 memcpy(varlen_data
1118 + LTTNG_SYMBOL_NAME_LEN * lsm.u.enable.exclusion_count,
1119 filter_expression,
1120 lsm.u.enable.expression_len);
1121 }
9ae110e2 1122 /* Add filter bytecode next. */
137b9942 1123 if (ctx && lsm.u.enable.bytecode_len != 0) {
6b453b5e
JG
1124 memcpy(varlen_data
1125 + LTTNG_SYMBOL_NAME_LEN * lsm.u.enable.exclusion_count
1126 + lsm.u.enable.expression_len,
1127 &ctx->bytecode->b,
1128 lsm.u.enable.bytecode_len);
93deb080
JI
1129 }
1130
795a978d 1131 ret = lttng_ctl_ask_sessiond_varlen_no_cmd_header(&lsm, varlen_data,
67676bd8 1132 (LTTNG_SYMBOL_NAME_LEN * lsm.u.enable.exclusion_count) +
9ae110e2
JG
1133 lsm.u.enable.bytecode_len + lsm.u.enable.expression_len,
1134 NULL);
6b453b5e 1135 free(varlen_data);
93deb080 1136
7ca1dc6f
DG
1137mem_error:
1138 if (filter_expression && ctx) {
93deb080
JI
1139 filter_bytecode_free(ctx);
1140 filter_ir_free(ctx);
1141 filter_parser_ctx_free(ctx);
7ca1dc6f
DG
1142 }
1143filter_error:
1144 if (free_filter_expression) {
1145 /*
9ae110e2
JG
1146 * The filter expression has been replaced and must be freed as
1147 * it is not the original filter expression received as a
1148 * parameter.
7ca1dc6f
DG
1149 */
1150 free(filter_expression);
93deb080 1151 }
137b9942
DG
1152error:
1153 /*
9ae110e2
JG
1154 * Return directly to the caller and don't ask the sessiond since
1155 * something went wrong in the parsing of data above.
137b9942 1156 */
93deb080 1157 return ret;
3e1c9ff7
DG
1158
1159ask_sessiond:
1160 ret = lttng_ctl_ask_sessiond(&lsm, NULL);
1161 return ret;
93deb080
JI
1162}
1163
6e911cad
MD
1164int lttng_disable_event_ext(struct lttng_handle *handle,
1165 struct lttng_event *ev, const char *channel_name,
1166 const char *original_filter_expression)
1df4dedd 1167{
cd80958d 1168 struct lttcomm_session_msg lsm;
6e911cad
MD
1169 char *varlen_data;
1170 int ret = 0;
1171 unsigned int free_filter_expression = 0;
1172 struct filter_parser_ctx *ctx = NULL;
1173 /*
1174 * Cast as non-const since we may replace the filter expression
1175 * by a dynamically allocated string. Otherwise, the original
1176 * string is not modified.
1177 */
1178 char *filter_expression = (char *) original_filter_expression;
1df4dedd 1179
6e911cad
MD
1180 if (handle == NULL || ev == NULL) {
1181 ret = -LTTNG_ERR_INVALID;
1182 goto error;
1183 }
1184
9ae110e2
JG
1185 /*
1186 * Empty filter string will always be rejected by the parser
6e911cad
MD
1187 * anyway, so treat this corner-case early to eliminate
1188 * lttng_fmemopen error for 0-byte allocation.
1189 */
1190 if (filter_expression && filter_expression[0] == '\0') {
1191 ret = -LTTNG_ERR_INVALID;
1192 goto error;
cd80958d
DG
1193 }
1194
441c16a7
MD
1195 memset(&lsm, 0, sizeof(lsm));
1196
85076754
MD
1197 /* If no channel name, send empty string. */
1198 if (channel_name == NULL) {
1199 lttng_ctl_copy_string(lsm.u.disable.channel_name, "",
cd80958d 1200 sizeof(lsm.u.disable.channel_name));
f3ed775e 1201 } else {
85076754 1202 lttng_ctl_copy_string(lsm.u.disable.channel_name, channel_name,
cd80958d 1203 sizeof(lsm.u.disable.channel_name));
eb354453
DG
1204 }
1205
18a720cd 1206 lsm.cmd_type = LTTNG_DISABLE_EVENT;
f3ed775e 1207
6e911cad
MD
1208 lttng_ctl_copy_lttng_domain(&lsm.domain, &handle->domain);
1209 /* FIXME: copying non-packed struct to packed struct. */
1210 memcpy(&lsm.u.disable.event, ev, sizeof(lsm.u.disable.event));
1211
cac3069d 1212 lttng_ctl_copy_string(lsm.session.name, handle->session_name,
cd80958d 1213 sizeof(lsm.session.name));
6e911cad 1214 lsm.u.disable.bytecode_len = 0;
cd80958d 1215
6e911cad
MD
1216 /*
1217 * For the JUL domain, a filter is enforced except for the
1218 * disable all event. This is done to avoid having the event in
1219 * all sessions thus filtering by logger name.
1220 */
1221 if (filter_expression == NULL &&
1222 (handle->domain.type != LTTNG_DOMAIN_JUL &&
0e115563
DG
1223 handle->domain.type != LTTNG_DOMAIN_LOG4J &&
1224 handle->domain.type != LTTNG_DOMAIN_PYTHON)) {
6e911cad
MD
1225 goto ask_sessiond;
1226 }
1227
1228 /*
1229 * We have a filter, so we need to set up a variable-length
1230 * memory block from where to send the data.
1231 */
1232
1233 /* Parse filter expression */
1234 if (filter_expression != NULL || handle->domain.type == LTTNG_DOMAIN_JUL
0e115563
DG
1235 || handle->domain.type == LTTNG_DOMAIN_LOG4J
1236 || handle->domain.type == LTTNG_DOMAIN_PYTHON) {
6e911cad 1237 if (handle->domain.type == LTTNG_DOMAIN_JUL ||
0e115563
DG
1238 handle->domain.type == LTTNG_DOMAIN_LOG4J ||
1239 handle->domain.type == LTTNG_DOMAIN_PYTHON) {
1240 char *agent_filter;
6e911cad
MD
1241
1242 /* Setup JUL filter if needed. */
0e115563
DG
1243 agent_filter = set_agent_filter(filter_expression, ev);
1244 if (!agent_filter) {
6e911cad 1245 if (!filter_expression) {
9ae110e2
JG
1246 /*
1247 * No JUL and no filter, just skip
1248 * everything below.
1249 */
6e911cad
MD
1250 goto ask_sessiond;
1251 }
1252 } else {
1253 /*
9ae110e2
JG
1254 * With a JUL filter, the original filter has
1255 * been added to it thus replace the filter
1256 * expression.
6e911cad 1257 */
0e115563 1258 filter_expression = agent_filter;
6e911cad
MD
1259 free_filter_expression = 1;
1260 }
1261 }
1262
1263 ret = generate_filter(filter_expression, &lsm, &ctx);
1264 if (ret) {
1265 goto filter_error;
1266 }
1267 }
1268
1269 varlen_data = zmalloc(lsm.u.disable.bytecode_len
1270 + lsm.u.disable.expression_len);
1271 if (!varlen_data) {
1272 ret = -LTTNG_ERR_EXCLUSION_NOMEM;
1273 goto mem_error;
1274 }
1275
9ae110e2 1276 /* Add filter expression. */
6e911cad
MD
1277 if (lsm.u.disable.expression_len != 0) {
1278 memcpy(varlen_data,
1279 filter_expression,
1280 lsm.u.disable.expression_len);
1281 }
9ae110e2 1282 /* Add filter bytecode next. */
6e911cad
MD
1283 if (ctx && lsm.u.disable.bytecode_len != 0) {
1284 memcpy(varlen_data
1285 + lsm.u.disable.expression_len,
1286 &ctx->bytecode->b,
1287 lsm.u.disable.bytecode_len);
1288 }
1289
795a978d 1290 ret = lttng_ctl_ask_sessiond_varlen_no_cmd_header(&lsm, varlen_data,
6e911cad
MD
1291 lsm.u.disable.bytecode_len + lsm.u.disable.expression_len, NULL);
1292 free(varlen_data);
1293
1294mem_error:
1295 if (filter_expression && ctx) {
1296 filter_bytecode_free(ctx);
1297 filter_ir_free(ctx);
1298 filter_parser_ctx_free(ctx);
1299 }
1300filter_error:
1301 if (free_filter_expression) {
1302 /*
9ae110e2
JG
1303 * The filter expression has been replaced and must be freed as
1304 * it is not the original filter expression received as a
1305 * parameter.
6e911cad
MD
1306 */
1307 free(filter_expression);
1308 }
1309error:
1310 /*
9ae110e2
JG
1311 * Return directly to the caller and don't ask the sessiond since
1312 * something went wrong in the parsing of data above.
6e911cad
MD
1313 */
1314 return ret;
1315
1316ask_sessiond:
1317 ret = lttng_ctl_ask_sessiond(&lsm, NULL);
1318 return ret;
1319}
1320
1321/*
9ae110e2
JG
1322 * Disable event(s) of a channel and domain.
1323 * If no event name is specified, all events are disabled.
1324 * If no channel name is specified, the default 'channel0' is used.
1325 * Returns size of returned session payload data or a negative error code.
6e911cad
MD
1326 */
1327int lttng_disable_event(struct lttng_handle *handle, const char *name,
1328 const char *channel_name)
1329{
1330 struct lttng_event ev;
1331
1332 memset(&ev, 0, sizeof(ev));
9b7431cf 1333 ev.loglevel = -1;
6e911cad
MD
1334 ev.type = LTTNG_EVENT_ALL;
1335 lttng_ctl_copy_string(ev.name, name, sizeof(ev.name));
1336 return lttng_disable_event_ext(handle, &ev, channel_name, NULL);
1df4dedd
DG
1337}
1338
cf0bcb51
JG
1339struct lttng_channel *lttng_channel_create(struct lttng_domain *domain)
1340{
1341 struct lttng_channel *channel = NULL;
1342 struct lttng_channel_extended *extended = NULL;
1343
1344 if (!domain) {
1345 goto error;
1346 }
1347
1348 /* Validate domain. */
1349 switch (domain->type) {
1350 case LTTNG_DOMAIN_UST:
1351 switch (domain->buf_type) {
1352 case LTTNG_BUFFER_PER_UID:
1353 case LTTNG_BUFFER_PER_PID:
1354 break;
1355 default:
1356 goto error;
1357 }
1358 break;
1359 case LTTNG_DOMAIN_KERNEL:
1360 if (domain->buf_type != LTTNG_BUFFER_GLOBAL) {
1361 goto error;
1362 }
1363 break;
1364 default:
1365 goto error;
1366 }
1367
1368 channel = zmalloc(sizeof(*channel));
1369 if (!channel) {
1370 goto error;
1371 }
1372
1373 extended = zmalloc(sizeof(*extended));
1374 if (!extended) {
1375 goto error;
1376 }
1377
1378 channel->attr.extended.ptr = extended;
1379
1380 lttng_channel_set_default_attr(domain, &channel->attr);
1381 return channel;
1382error:
1383 free(channel);
1384 free(extended);
1385 return NULL;
1386}
1387
1388void lttng_channel_destroy(struct lttng_channel *channel)
1389{
1390 if (!channel) {
1391 return;
1392 }
1393
1394 if (channel->attr.extended.ptr) {
1395 free(channel->attr.extended.ptr);
1396 }
1397 free(channel);
1398}
1399
1df4dedd 1400/*
9ae110e2
JG
1401 * Enable channel per domain
1402 * Returns size of returned session payload data or a negative error code.
a5c5a2bd 1403 */
cd80958d 1404int lttng_enable_channel(struct lttng_handle *handle,
cf0bcb51 1405 struct lttng_channel *in_chan)
a5c5a2bd 1406{
cd80958d
DG
1407 struct lttcomm_session_msg lsm;
1408
9ae110e2 1409 /* NULL arguments are forbidden. No default values. */
cf0bcb51 1410 if (handle == NULL || in_chan == NULL) {
2f70b271 1411 return -LTTNG_ERR_INVALID;
cd80958d
DG
1412 }
1413
441c16a7 1414 memset(&lsm, 0, sizeof(lsm));
cf0bcb51
JG
1415 memcpy(&lsm.u.channel.chan, in_chan, sizeof(lsm.u.channel.chan));
1416 lsm.u.channel.chan.attr.extended.ptr = NULL;
441c16a7 1417
cf0bcb51
JG
1418 if (!in_chan->attr.extended.ptr) {
1419 struct lttng_channel *channel;
1420 struct lttng_channel_extended *extended;
7d29a247 1421
cf0bcb51
JG
1422 channel = lttng_channel_create(&handle->domain);
1423 if (!channel) {
1424 return -LTTNG_ERR_NOMEM;
1425 }
1426
1427 /*
1428 * Create a new channel in order to use default extended
1429 * attribute values.
1430 */
1431 extended = (struct lttng_channel_extended *)
1432 channel->attr.extended.ptr;
1433 memcpy(&lsm.u.channel.extended, extended, sizeof(*extended));
1434 lttng_channel_destroy(channel);
1435 } else {
1436 struct lttng_channel_extended *extended;
1437
1438 extended = (struct lttng_channel_extended *)
1439 in_chan->attr.extended.ptr;
1440 memcpy(&lsm.u.channel.extended, extended, sizeof(*extended));
1441 }
cd80958d 1442
cf0bcb51 1443 lsm.cmd_type = LTTNG_ENABLE_CHANNEL;
cac3069d 1444 lttng_ctl_copy_lttng_domain(&lsm.domain, &handle->domain);
7d29a247 1445
cac3069d 1446 lttng_ctl_copy_string(lsm.session.name, handle->session_name,
cd80958d
DG
1447 sizeof(lsm.session.name));
1448
cac3069d 1449 return lttng_ctl_ask_sessiond(&lsm, NULL);
8c0faa1d 1450}
1df4dedd 1451
2ef84c95 1452/*
9ae110e2
JG
1453 * All tracing will be stopped for registered events of the channel.
1454 * Returns size of returned session payload data or a negative error code.
2ef84c95 1455 */
cd80958d 1456int lttng_disable_channel(struct lttng_handle *handle, const char *name)
2ef84c95 1457{
cd80958d
DG
1458 struct lttcomm_session_msg lsm;
1459
9ae110e2 1460 /* Safety check. Both are mandatory. */
9d697d3d 1461 if (handle == NULL || name == NULL) {
2f70b271 1462 return -LTTNG_ERR_INVALID;
cd80958d
DG
1463 }
1464
441c16a7
MD
1465 memset(&lsm, 0, sizeof(lsm));
1466
cd80958d 1467 lsm.cmd_type = LTTNG_DISABLE_CHANNEL;
1df4dedd 1468
cac3069d 1469 lttng_ctl_copy_string(lsm.u.disable.channel_name, name,
9d697d3d
DG
1470 sizeof(lsm.u.disable.channel_name));
1471
cac3069d 1472 lttng_ctl_copy_lttng_domain(&lsm.domain, &handle->domain);
cd80958d 1473
cac3069d 1474 lttng_ctl_copy_string(lsm.session.name, handle->session_name,
cd80958d
DG
1475 sizeof(lsm.session.name));
1476
cac3069d 1477 return lttng_ctl_ask_sessiond(&lsm, NULL);
ca95a216
DG
1478}
1479
ccf10263 1480/*
9ae110e2
JG
1481 * Add PID to session tracker.
1482 * Return 0 on success else a negative LTTng error code.
ccf10263
MD
1483 */
1484int lttng_track_pid(struct lttng_handle *handle, int pid)
1485{
1486 struct lttcomm_session_msg lsm;
1487
9ae110e2 1488 /* NULL arguments are forbidden. No default values. */
ccf10263
MD
1489 if (handle == NULL) {
1490 return -LTTNG_ERR_INVALID;
1491 }
1492
1493 memset(&lsm, 0, sizeof(lsm));
1494
1495 lsm.cmd_type = LTTNG_TRACK_PID;
1496 lsm.u.pid_tracker.pid = pid;
1497
1498 lttng_ctl_copy_lttng_domain(&lsm.domain, &handle->domain);
1499
1500 lttng_ctl_copy_string(lsm.session.name, handle->session_name,
1501 sizeof(lsm.session.name));
1502
1503 return lttng_ctl_ask_sessiond(&lsm, NULL);
1504}
1505
1506/*
9ae110e2
JG
1507 * Remove PID from session tracker.
1508 * Return 0 on success else a negative LTTng error code.
ccf10263
MD
1509 */
1510int lttng_untrack_pid(struct lttng_handle *handle, int pid)
1511{
1512 struct lttcomm_session_msg lsm;
1513
9ae110e2 1514 /* NULL arguments are forbidden. No default values. */
ccf10263
MD
1515 if (handle == NULL) {
1516 return -LTTNG_ERR_INVALID;
1517 }
1518
1519 memset(&lsm, 0, sizeof(lsm));
1520
1521 lsm.cmd_type = LTTNG_UNTRACK_PID;
1522 lsm.u.pid_tracker.pid = pid;
1523
1524 lttng_ctl_copy_lttng_domain(&lsm.domain, &handle->domain);
1525
1526 lttng_ctl_copy_string(lsm.session.name, handle->session_name,
1527 sizeof(lsm.session.name));
1528
1529 return lttng_ctl_ask_sessiond(&lsm, NULL);
1530}
1531
fac6795d 1532/*
9ae110e2
JG
1533 * Lists all available tracepoints of domain.
1534 * Sets the contents of the events array.
1535 * Returns the number of lttng_event entries in events;
1536 * on error, returns a negative value.
fac6795d 1537 */
cd80958d 1538int lttng_list_tracepoints(struct lttng_handle *handle,
2a71efd5 1539 struct lttng_event **events)
fac6795d 1540{
052da939 1541 int ret;
cd80958d
DG
1542 struct lttcomm_session_msg lsm;
1543
9d697d3d 1544 if (handle == NULL) {
2f70b271 1545 return -LTTNG_ERR_INVALID;
cd80958d 1546 }
fac6795d 1547
53efb85a 1548 memset(&lsm, 0, sizeof(lsm));
cd80958d 1549 lsm.cmd_type = LTTNG_LIST_TRACEPOINTS;
cac3069d 1550 lttng_ctl_copy_lttng_domain(&lsm.domain, &handle->domain);
2a71efd5 1551
cac3069d 1552 ret = lttng_ctl_ask_sessiond(&lsm, (void **) events);
052da939
DG
1553 if (ret < 0) {
1554 return ret;
eb354453 1555 }
fac6795d 1556
9f19cc17 1557 return ret / sizeof(struct lttng_event);
fac6795d
DG
1558}
1559
f37d259d 1560/*
9ae110e2
JG
1561 * Lists all available tracepoint fields of domain.
1562 * Sets the contents of the event field array.
1563 * Returns the number of lttng_event_field entries in events;
1564 * on error, returns a negative value.
f37d259d
MD
1565 */
1566int lttng_list_tracepoint_fields(struct lttng_handle *handle,
1567 struct lttng_event_field **fields)
1568{
1569 int ret;
1570 struct lttcomm_session_msg lsm;
1571
1572 if (handle == NULL) {
2f70b271 1573 return -LTTNG_ERR_INVALID;
f37d259d
MD
1574 }
1575
53efb85a 1576 memset(&lsm, 0, sizeof(lsm));
f37d259d 1577 lsm.cmd_type = LTTNG_LIST_TRACEPOINT_FIELDS;
cac3069d 1578 lttng_ctl_copy_lttng_domain(&lsm.domain, &handle->domain);
f37d259d 1579
cac3069d 1580 ret = lttng_ctl_ask_sessiond(&lsm, (void **) fields);
f37d259d
MD
1581 if (ret < 0) {
1582 return ret;
1583 }
1584
1585 return ret / sizeof(struct lttng_event_field);
1586}
1587
834978fd 1588/*
9ae110e2
JG
1589 * Lists all available kernel system calls. Allocates and sets the contents of
1590 * the events array.
834978fd 1591 *
9ae110e2
JG
1592 * Returns the number of lttng_event entries in events; on error, returns a
1593 * negative value.
834978fd
DG
1594 */
1595int lttng_list_syscalls(struct lttng_event **events)
1596{
1597 int ret;
1598 struct lttcomm_session_msg lsm;
1599
1600 if (!events) {
1601 return -LTTNG_ERR_INVALID;
1602 }
1603
1604 memset(&lsm, 0, sizeof(lsm));
1605 lsm.cmd_type = LTTNG_LIST_SYSCALLS;
1606 /* Force kernel domain for system calls. */
1607 lsm.domain.type = LTTNG_DOMAIN_KERNEL;
1608
1609 ret = lttng_ctl_ask_sessiond(&lsm, (void **) events);
1610 if (ret < 0) {
1611 return ret;
1612 }
1613
1614 return ret / sizeof(struct lttng_event);
1615}
1616
1657e9bb 1617/*
9ae110e2
JG
1618 * Returns a human readable string describing
1619 * the error code (a negative value).
1657e9bb 1620 */
9a745bc7 1621const char *lttng_strerror(int code)
1657e9bb 1622{
f73fabfd 1623 return error_get_str(code);
1657e9bb
DG
1624}
1625
aaf97519 1626/*
a4b92340
DG
1627 * Create a brand new session using name and url for destination.
1628 *
f73fabfd 1629 * Returns LTTNG_OK on success or a negative error code.
00e2e675 1630 */
a4b92340 1631int lttng_create_session(const char *name, const char *url)
00e2e675 1632{
3dd05a85 1633 int ret;
a4b92340 1634 ssize_t size;
00e2e675 1635 struct lttcomm_session_msg lsm;
a4b92340 1636 struct lttng_uri *uris = NULL;
00e2e675 1637
a4b92340 1638 if (name == NULL) {
2f70b271 1639 return -LTTNG_ERR_INVALID;
00e2e675
DG
1640 }
1641
a4b92340 1642 memset(&lsm, 0, sizeof(lsm));
00e2e675 1643
a4b92340 1644 lsm.cmd_type = LTTNG_CREATE_SESSION;
cac3069d 1645 lttng_ctl_copy_string(lsm.session.name, name, sizeof(lsm.session.name));
a4b92340
DG
1646
1647 /* There should never be a data URL */
bc894455 1648 size = uri_parse_str_urls(url, NULL, &uris);
a4b92340 1649 if (size < 0) {
2f70b271 1650 return -LTTNG_ERR_INVALID;
00e2e675
DG
1651 }
1652
a4b92340
DG
1653 lsm.u.uri.size = size;
1654
795a978d 1655 ret = lttng_ctl_ask_sessiond_varlen_no_cmd_header(&lsm, uris,
cac3069d 1656 sizeof(struct lttng_uri) * size, NULL);
3dd05a85
DG
1657
1658 free(uris);
1659 return ret;
00e2e675
DG
1660}
1661
8028d920 1662/*
9ae110e2
JG
1663 * Destroy session using name.
1664 * Returns size of returned session payload data or a negative error code.
8028d920 1665 */
8fd2c92c 1666static
e20ee7c2 1667int _lttng_destroy_session(const char *session_name)
8028d920 1668{
cd80958d
DG
1669 struct lttcomm_session_msg lsm;
1670
843f5df9 1671 if (session_name == NULL) {
2f70b271 1672 return -LTTNG_ERR_INVALID;
cd80958d
DG
1673 }
1674
53efb85a 1675 memset(&lsm, 0, sizeof(lsm));
cd80958d 1676 lsm.cmd_type = LTTNG_DESTROY_SESSION;
843f5df9 1677
cac3069d
DG
1678 lttng_ctl_copy_string(lsm.session.name, session_name,
1679 sizeof(lsm.session.name));
cd80958d 1680
cac3069d 1681 return lttng_ctl_ask_sessiond(&lsm, NULL);
aaf97519
DG
1682}
1683
e20ee7c2
JD
1684/*
1685 * Stop the session and wait for the data before destroying it
1686 */
1687int lttng_destroy_session(const char *session_name)
1688{
1689 int ret;
1690
1691 /*
1692 * Stop the tracing and wait for the data.
1693 */
1694 ret = _lttng_stop_tracing(session_name, 1);
1695 if (ret && ret != -LTTNG_ERR_TRACE_ALREADY_STOPPED) {
1696 goto end;
1697 }
1698
1699 ret = _lttng_destroy_session(session_name);
1700end:
1701 return ret;
1702}
1703
1704/*
1705 * Destroy the session without waiting for the data.
1706 */
1707int lttng_destroy_session_no_wait(const char *session_name)
1708{
1709 int ret;
1710
1711 /*
1712 * Stop the tracing without waiting for the data.
1713 * The session might already have been stopped, so just
1714 * skip this error.
1715 */
1716 ret = _lttng_stop_tracing(session_name, 0);
1717 if (ret && ret != -LTTNG_ERR_TRACE_ALREADY_STOPPED) {
1718 goto end;
1719 }
1720
1721 ret = _lttng_destroy_session(session_name);
1722end:
1723 return ret;
1724}
1725
57167058 1726/*
9ae110e2
JG
1727 * Ask the session daemon for all available sessions.
1728 * Sets the contents of the sessions array.
1729 * Returns the number of lttng_session entries in sessions;
1730 * on error, returns a negative value.
57167058 1731 */
ca95a216 1732int lttng_list_sessions(struct lttng_session **sessions)
57167058 1733{
ca95a216 1734 int ret;
cd80958d 1735 struct lttcomm_session_msg lsm;
57167058 1736
53efb85a 1737 memset(&lsm, 0, sizeof(lsm));
cd80958d 1738 lsm.cmd_type = LTTNG_LIST_SESSIONS;
cac3069d 1739 ret = lttng_ctl_ask_sessiond(&lsm, (void**) sessions);
57167058 1740 if (ret < 0) {
ca95a216 1741 return ret;
57167058
DG
1742 }
1743
ca95a216 1744 return ret / sizeof(struct lttng_session);
57167058
DG
1745}
1746
d7ba1388
MD
1747int lttng_set_session_shm_path(const char *session_name,
1748 const char *shm_path)
1749{
1750 struct lttcomm_session_msg lsm;
1751
1752 if (session_name == NULL) {
1753 return -LTTNG_ERR_INVALID;
1754 }
1755
1756 memset(&lsm, 0, sizeof(lsm));
1757 lsm.cmd_type = LTTNG_SET_SESSION_SHM_PATH;
1758
1759 lttng_ctl_copy_string(lsm.session.name, session_name,
1760 sizeof(lsm.session.name));
1761 lttng_ctl_copy_string(lsm.u.set_shm_path.shm_path, shm_path,
1762 sizeof(lsm.u.set_shm_path.shm_path));
1763
1764 return lttng_ctl_ask_sessiond(&lsm, NULL);
1765}
1766
9f19cc17 1767/*
9ae110e2
JG
1768 * Ask the session daemon for all available domains of a session.
1769 * Sets the contents of the domains array.
1770 * Returns the number of lttng_domain entries in domains;
1771 * on error, returns a negative value.
9f19cc17 1772 */
330be774 1773int lttng_list_domains(const char *session_name,
cd80958d 1774 struct lttng_domain **domains)
9f19cc17
DG
1775{
1776 int ret;
cd80958d
DG
1777 struct lttcomm_session_msg lsm;
1778
330be774 1779 if (session_name == NULL) {
2f70b271 1780 return -LTTNG_ERR_INVALID;
cd80958d 1781 }
9f19cc17 1782
53efb85a 1783 memset(&lsm, 0, sizeof(lsm));
cd80958d
DG
1784 lsm.cmd_type = LTTNG_LIST_DOMAINS;
1785
cac3069d
DG
1786 lttng_ctl_copy_string(lsm.session.name, session_name,
1787 sizeof(lsm.session.name));
cd80958d 1788
cac3069d 1789 ret = lttng_ctl_ask_sessiond(&lsm, (void**) domains);
9f19cc17
DG
1790 if (ret < 0) {
1791 return ret;
1792 }
1793
1794 return ret / sizeof(struct lttng_domain);
1795}
1796
1797/*
9ae110e2
JG
1798 * Ask the session daemon for all available channels of a session.
1799 * Sets the contents of the channels array.
1800 * Returns the number of lttng_channel entries in channels;
1801 * on error, returns a negative value.
9f19cc17 1802 */
cd80958d
DG
1803int lttng_list_channels(struct lttng_handle *handle,
1804 struct lttng_channel **channels)
9f19cc17
DG
1805{
1806 int ret;
53e367f9
JG
1807 size_t channel_count, i;
1808 const size_t channel_size = sizeof(struct lttng_channel) +
cf0bcb51 1809 sizeof(struct lttng_channel_extended);
cd80958d 1810 struct lttcomm_session_msg lsm;
53e367f9 1811 void *extended_at;
cd80958d 1812
9d697d3d 1813 if (handle == NULL) {
53e367f9
JG
1814 ret = -LTTNG_ERR_INVALID;
1815 goto end;
cd80958d
DG
1816 }
1817
53efb85a 1818 memset(&lsm, 0, sizeof(lsm));
cd80958d 1819 lsm.cmd_type = LTTNG_LIST_CHANNELS;
cac3069d 1820 lttng_ctl_copy_string(lsm.session.name, handle->session_name,
cd80958d 1821 sizeof(lsm.session.name));
9f19cc17 1822
cac3069d 1823 lttng_ctl_copy_lttng_domain(&lsm.domain, &handle->domain);
9f19cc17 1824
cac3069d 1825 ret = lttng_ctl_ask_sessiond(&lsm, (void**) channels);
9f19cc17 1826 if (ret < 0) {
53e367f9
JG
1827 goto end;
1828 }
1829
1830 if (ret % channel_size) {
1831 ret = -LTTNG_ERR_UNK;
1832 free(*channels);
1833 *channels = NULL;
1834 goto end;
9f19cc17 1835 }
53e367f9 1836 channel_count = (size_t) ret / channel_size;
9f19cc17 1837
53e367f9
JG
1838 /* Set extended info pointers */
1839 extended_at = ((void *) *channels) +
1840 channel_count * sizeof(struct lttng_channel);
1841 for (i = 0; i < channel_count; i++) {
1842 struct lttng_channel *chan = &(*channels)[i];
1843
1844 chan->attr.extended.ptr = extended_at;
cf0bcb51 1845 extended_at += sizeof(struct lttng_channel_extended);
53e367f9
JG
1846 }
1847
1848 ret = (int) channel_count;
1849end:
1850 return ret;
9f19cc17
DG
1851}
1852
1853/*
9ae110e2
JG
1854 * Ask the session daemon for all available events of a session channel.
1855 * Sets the contents of the events array.
1856 * Returns the number of lttng_event entries in events;
1857 * on error, returns a negative value.
9f19cc17 1858 */
cd80958d
DG
1859int lttng_list_events(struct lttng_handle *handle,
1860 const char *channel_name, struct lttng_event **events)
9f19cc17
DG
1861{
1862 int ret;
cd80958d 1863 struct lttcomm_session_msg lsm;
b4e3ceb9
PP
1864 struct lttcomm_event_command_header *cmd_header = NULL;
1865 size_t cmd_header_len;
1866 uint32_t nb_events, i;
1867 void *extended_at;
9f19cc17 1868
9d697d3d
DG
1869 /* Safety check. An handle and channel name are mandatory */
1870 if (handle == NULL || channel_name == NULL) {
2f70b271 1871 return -LTTNG_ERR_INVALID;
cd80958d
DG
1872 }
1873
53efb85a 1874 memset(&lsm, 0, sizeof(lsm));
cd80958d 1875 lsm.cmd_type = LTTNG_LIST_EVENTS;
cac3069d 1876 lttng_ctl_copy_string(lsm.session.name, handle->session_name,
cd80958d 1877 sizeof(lsm.session.name));
cac3069d 1878 lttng_ctl_copy_string(lsm.u.list.channel_name, channel_name,
cd80958d 1879 sizeof(lsm.u.list.channel_name));
cac3069d 1880 lttng_ctl_copy_lttng_domain(&lsm.domain, &handle->domain);
9f19cc17 1881
b4e3ceb9
PP
1882 ret = lttng_ctl_ask_sessiond_varlen(&lsm, NULL, 0, (void **) events,
1883 (void **) &cmd_header, &cmd_header_len);
9f19cc17 1884 if (ret < 0) {
b4e3ceb9 1885 goto error;
9f19cc17
DG
1886 }
1887
b4e3ceb9
PP
1888 /* Set number of events and free command header */
1889 nb_events = cmd_header->nb_events;
1890 if (nb_events > INT_MAX) {
1891 ret = -EOVERFLOW;
1892 goto error;
1893 }
1894 ret = (int) nb_events;
1895 free(cmd_header);
1896 cmd_header = NULL;
1897
1898 /* Set extended info pointers */
1899 extended_at = ((void*) (*events)) +
1900 nb_events * sizeof(struct lttng_event);
1901
1902 for (i = 0; i < nb_events; i++) {
1903 struct lttcomm_event_extended_header *ext_header;
1904 struct lttng_event *event = &(*events)[i];
1905
1906 event->extended.ptr = extended_at;
1907 ext_header =
1908 (struct lttcomm_event_extended_header *) extended_at;
1909 extended_at += sizeof(*ext_header);
1910 extended_at += ext_header->filter_len;
795d57ce
PP
1911 extended_at +=
1912 ext_header->nb_exclusions * LTTNG_SYMBOL_NAME_LEN;
b4e3ceb9
PP
1913 }
1914
1915 return ret;
1916error:
1917 free(cmd_header);
1918 free(*events);
1919 return ret;
9f19cc17
DG
1920}
1921
134e72ed
JG
1922int lttng_event_get_filter_expression(struct lttng_event *event,
1923 const char **filter_expression)
d31d3e8c
PP
1924{
1925 int ret = 0;
1926 struct lttcomm_event_extended_header *ext_header;
1927
134e72ed 1928 if (!event || !filter_expression) {
d31d3e8c
PP
1929 ret = -LTTNG_ERR_INVALID;
1930 goto end;
1931 }
1932
1933 ext_header = event->extended.ptr;
1934
1935 if (!ext_header) {
1936 /*
1937 * This can happen since the lttng_event structure is
1938 * used for other tasks where this pointer is never set.
1939 */
134e72ed 1940 *filter_expression = NULL;
d31d3e8c
PP
1941 goto end;
1942 }
1943
1944 if (ext_header->filter_len) {
134e72ed
JG
1945 *filter_expression = ((const char *) (ext_header)) +
1946 sizeof(*ext_header);
d31d3e8c 1947 } else {
134e72ed 1948 *filter_expression = NULL;
d31d3e8c
PP
1949 }
1950
1951end:
1952 return ret;
1953}
b4e3ceb9 1954
f086e50e
PP
1955int lttng_event_get_exclusion_name_count(struct lttng_event *event)
1956{
1957 int ret;
1958 struct lttcomm_event_extended_header *ext_header;
1959
1960 if (!event) {
1961 ret = -LTTNG_ERR_INVALID;
1962 goto end;
1963 }
1964
1965 ext_header = event->extended.ptr;
1966 if (!ext_header) {
1967 /*
1968 * This can happen since the lttng_event structure is
1969 * used for other tasks where this pointer is never set.
1970 */
1971 ret = 0;
1972 goto end;
1973 }
1974
1975 if (ext_header->nb_exclusions > INT_MAX) {
1976 ret = -LTTNG_ERR_OVERFLOW;
1977 goto end;
1978 }
1979 ret = (int) ext_header->nb_exclusions;
1980end:
1981 return ret;
1982}
1983
1984int lttng_event_get_exclusion_name(struct lttng_event *event,
1985 size_t index, const char **exclusion_name)
1986{
1987 int ret = 0;
1988 struct lttcomm_event_extended_header *ext_header;
1989 void *at;
1990
1991 if (!event || !exclusion_name) {
1992 ret = -LTTNG_ERR_INVALID;
1993 goto end;
1994 }
1995
1996 ext_header = event->extended.ptr;
1997 if (!ext_header) {
1998 ret = -LTTNG_ERR_INVALID;
1999 goto end;
2000 }
2001
2002 if (index >= ext_header->nb_exclusions) {
2003 ret = -LTTNG_ERR_INVALID;
2004 goto end;
2005 }
2006
2007 at = (void *) ext_header + sizeof(*ext_header);
2008 at += ext_header->filter_len;
2009 at += index * LTTNG_SYMBOL_NAME_LEN;
2010 *exclusion_name = at;
2011
2012end:
2013 return ret;
2014}
2015
fac6795d 2016/*
1c8d13c8
TD
2017 * Sets the tracing_group variable with name.
2018 * This function allocates memory pointed to by tracing_group.
2019 * On success, returns 0, on error, returns -1 (null name) or -ENOMEM.
fac6795d
DG
2020 */
2021int lttng_set_tracing_group(const char *name)
2022{
9d697d3d 2023 if (name == NULL) {
2f70b271 2024 return -LTTNG_ERR_INVALID;
9d697d3d
DG
2025 }
2026
fac6795d 2027 if (asprintf(&tracing_group, "%s", name) < 0) {
2f70b271 2028 return -LTTNG_ERR_FATAL;
fac6795d
DG
2029 }
2030
2031 return 0;
2032}
2033
cd80958d 2034int lttng_calibrate(struct lttng_handle *handle,
d0254c7c
MD
2035 struct lttng_calibrate *calibrate)
2036{
b812e5ca
PP
2037 /*
2038 * This command was removed in LTTng 2.9.
2039 */
2040 return -LTTNG_ERR_UND;
d0254c7c
MD
2041}
2042
5edd7e09
DG
2043/*
2044 * Set default channel attributes.
441c16a7 2045 * If either or both of the arguments are null, attr content is zeroe'd.
5edd7e09
DG
2046 */
2047void lttng_channel_set_default_attr(struct lttng_domain *domain,
2048 struct lttng_channel_attr *attr)
2049{
294851b0 2050 struct lttng_channel_extended *extended;
cf0bcb51 2051
5edd7e09
DG
2052 /* Safety check */
2053 if (attr == NULL || domain == NULL) {
2054 return;
2055 }
2056
294851b0 2057 extended = (struct lttng_channel_extended *) attr->extended.ptr;
eacaa7a6
DS
2058 memset(attr, 0, sizeof(struct lttng_channel_attr));
2059
0a9c6494
DG
2060 /* Same for all domains. */
2061 attr->overwrite = DEFAULT_CHANNEL_OVERWRITE;
2062 attr->tracefile_size = DEFAULT_CHANNEL_TRACEFILE_SIZE;
2063 attr->tracefile_count = DEFAULT_CHANNEL_TRACEFILE_COUNT;
2064
5edd7e09
DG
2065 switch (domain->type) {
2066 case LTTNG_DOMAIN_KERNEL:
9ae110e2
JG
2067 attr->switch_timer_interval =
2068 DEFAULT_KERNEL_CHANNEL_SWITCH_TIMER;
d92ff3ef 2069 attr->read_timer_interval = DEFAULT_KERNEL_CHANNEL_READ_TIMER;
3e230f92 2070 attr->subbuf_size = default_get_kernel_channel_subbuf_size();
5edd7e09
DG
2071 attr->num_subbuf = DEFAULT_KERNEL_CHANNEL_SUBBUF_NUM;
2072 attr->output = DEFAULT_KERNEL_CHANNEL_OUTPUT;
cf0bcb51
JG
2073 if (extended) {
2074 extended->monitor_timer_interval =
2075 DEFAULT_KERNEL_CHANNEL_MONITOR_TIMER;
2076 }
5edd7e09
DG
2077 break;
2078 case LTTNG_DOMAIN_UST:
0a9c6494
DG
2079 switch (domain->buf_type) {
2080 case LTTNG_BUFFER_PER_UID:
2081 attr->subbuf_size = default_get_ust_uid_channel_subbuf_size();
2082 attr->num_subbuf = DEFAULT_UST_UID_CHANNEL_SUBBUF_NUM;
2083 attr->output = DEFAULT_UST_UID_CHANNEL_OUTPUT;
9ae110e2
JG
2084 attr->switch_timer_interval =
2085 DEFAULT_UST_UID_CHANNEL_SWITCH_TIMER;
2086 attr->read_timer_interval =
2087 DEFAULT_UST_UID_CHANNEL_READ_TIMER;
cf0bcb51
JG
2088 if (extended) {
2089 extended->monitor_timer_interval =
2090 DEFAULT_UST_UID_CHANNEL_MONITOR_TIMER;
2091 }
0a9c6494
DG
2092 break;
2093 case LTTNG_BUFFER_PER_PID:
2094 default:
2095 attr->subbuf_size = default_get_ust_pid_channel_subbuf_size();
2096 attr->num_subbuf = DEFAULT_UST_PID_CHANNEL_SUBBUF_NUM;
2097 attr->output = DEFAULT_UST_PID_CHANNEL_OUTPUT;
9ae110e2
JG
2098 attr->switch_timer_interval =
2099 DEFAULT_UST_PID_CHANNEL_SWITCH_TIMER;
2100 attr->read_timer_interval =
2101 DEFAULT_UST_PID_CHANNEL_READ_TIMER;
cf0bcb51
JG
2102 if (extended) {
2103 extended->monitor_timer_interval =
2104 DEFAULT_UST_PID_CHANNEL_MONITOR_TIMER;
2105 }
0a9c6494
DG
2106 break;
2107 }
5edd7e09 2108 default:
441c16a7 2109 /* Default behavior: leave set to 0. */
5edd7e09
DG
2110 break;
2111 }
cf0bcb51
JG
2112
2113 attr->extended.ptr = extended;
5edd7e09
DG
2114}
2115
5ba3702f
JG
2116int lttng_channel_get_discarded_event_count(struct lttng_channel *channel,
2117 uint64_t *discarded_events)
2118{
2119 int ret = 0;
cf0bcb51 2120 struct lttng_channel_extended *chan_ext;
5ba3702f
JG
2121
2122 if (!channel || !discarded_events) {
2123 ret = -LTTNG_ERR_INVALID;
2124 goto end;
2125 }
2126
2127 chan_ext = channel->attr.extended.ptr;
2128 if (!chan_ext) {
2129 /*
2130 * This can happen since the lttng_channel structure is
2131 * used for other tasks where this pointer is never set.
2132 */
2133 *discarded_events = 0;
2134 goto end;
2135 }
2136
2137 *discarded_events = chan_ext->discarded_events;
2138end:
2139 return ret;
2140}
2141
2142int lttng_channel_get_lost_packet_count(struct lttng_channel *channel,
2143 uint64_t *lost_packets)
2144{
2145 int ret = 0;
cf0bcb51 2146 struct lttng_channel_extended *chan_ext;
5ba3702f
JG
2147
2148 if (!channel || !lost_packets) {
2149 ret = -LTTNG_ERR_INVALID;
2150 goto end;
2151 }
2152
2153 chan_ext = channel->attr.extended.ptr;
2154 if (!chan_ext) {
2155 /*
2156 * This can happen since the lttng_channel structure is
2157 * used for other tasks where this pointer is never set.
2158 */
2159 *lost_packets = 0;
2160 goto end;
2161 }
2162
2163 *lost_packets = chan_ext->lost_packets;
2164end:
2165 return ret;
2166}
2167
cf0bcb51
JG
2168int lttng_channel_get_monitor_timer_interval(struct lttng_channel *chan,
2169 uint64_t *monitor_timer_interval)
2170{
2171 int ret = 0;
2172
2173 if (!chan || !monitor_timer_interval) {
2174 ret = -LTTNG_ERR_INVALID;
2175 goto end;
2176 }
2177
2178 if (!chan->attr.extended.ptr) {
2179 ret = -LTTNG_ERR_INVALID;
2180 goto end;
2181 }
2182
2183 *monitor_timer_interval = ((struct lttng_channel_extended *)
2184 chan->attr.extended.ptr)->monitor_timer_interval;
2185end:
2186 return ret;
2187}
2188
2189int lttng_channel_set_monitor_timer_interval(struct lttng_channel *chan,
2190 uint64_t monitor_timer_interval)
2191{
2192 int ret = 0;
2193
2194 if (!chan || !chan->attr.extended.ptr) {
2195 ret = -LTTNG_ERR_INVALID;
2196 goto end;
2197 }
2198
2199 ((struct lttng_channel_extended *)
2200 chan->attr.extended.ptr)->monitor_timer_interval =
2201 monitor_timer_interval;
2202end:
2203 return ret;
2204}
2205
fac6795d 2206/*
2269e89e 2207 * Check if session daemon is alive.
fac6795d 2208 *
2269e89e 2209 * Return 1 if alive or 0 if not.
1c8d13c8 2210 * On error returns a negative value.
fac6795d 2211 */
947308c4 2212int lttng_session_daemon_alive(void)
fac6795d
DG
2213{
2214 int ret;
2215
2216 ret = set_session_daemon_path();
2217 if (ret < 0) {
9ae110e2 2218 /* Error. */
fac6795d
DG
2219 return ret;
2220 }
2221
9d035200 2222 if (*sessiond_sock_path == '\0') {
2f70b271 2223 /*
9ae110e2
JG
2224 * No socket path set. Weird error which means the constructor
2225 * was not called.
2f70b271
DG
2226 */
2227 assert(0);
fac6795d
DG
2228 }
2229
2269e89e 2230 ret = try_connect_sessiond(sessiond_sock_path);
7d8234d9 2231 if (ret < 0) {
9ae110e2 2232 /* Not alive. */
7d8234d9
MD
2233 return 0;
2234 }
7d8234d9 2235
9ae110e2 2236 /* Is alive. */
947308c4 2237 return 1;
fac6795d
DG
2238}
2239
00e2e675 2240/*
a4b92340 2241 * Set URL for a consumer for a session and domain.
00e2e675
DG
2242 *
2243 * Return 0 on success, else a negative value.
2244 */
a4b92340
DG
2245int lttng_set_consumer_url(struct lttng_handle *handle,
2246 const char *control_url, const char *data_url)
00e2e675 2247{
3dd05a85 2248 int ret;
a4b92340 2249 ssize_t size;
00e2e675 2250 struct lttcomm_session_msg lsm;
a4b92340 2251 struct lttng_uri *uris = NULL;
00e2e675 2252
a4b92340 2253 if (handle == NULL || (control_url == NULL && data_url == NULL)) {
2f70b271 2254 return -LTTNG_ERR_INVALID;
00e2e675
DG
2255 }
2256
a4b92340
DG
2257 memset(&lsm, 0, sizeof(lsm));
2258
00e2e675
DG
2259 lsm.cmd_type = LTTNG_SET_CONSUMER_URI;
2260
cac3069d 2261 lttng_ctl_copy_string(lsm.session.name, handle->session_name,
00e2e675 2262 sizeof(lsm.session.name));
cac3069d 2263 lttng_ctl_copy_lttng_domain(&lsm.domain, &handle->domain);
00e2e675 2264
bc894455 2265 size = uri_parse_str_urls(control_url, data_url, &uris);
a4b92340 2266 if (size < 0) {
2f70b271 2267 return -LTTNG_ERR_INVALID;
a4b92340
DG
2268 }
2269
2270 lsm.u.uri.size = size;
00e2e675 2271
795a978d 2272 ret = lttng_ctl_ask_sessiond_varlen_no_cmd_header(&lsm, uris,
cac3069d 2273 sizeof(struct lttng_uri) * size, NULL);
3dd05a85
DG
2274
2275 free(uris);
2276 return ret;
00e2e675
DG
2277}
2278
2279/*
9c6bda17 2280 * [OBSOLETE]
00e2e675
DG
2281 */
2282int lttng_enable_consumer(struct lttng_handle *handle)
2283{
785d2d0d 2284 return -ENOSYS;
00e2e675
DG
2285}
2286
2287/*
9c6bda17 2288 * [OBSOLETE]
00e2e675
DG
2289 */
2290int lttng_disable_consumer(struct lttng_handle *handle)
2291{
785d2d0d 2292 return -ENOSYS;
00e2e675
DG
2293}
2294
07424f16
DG
2295/*
2296 * This is an extension of create session that is ONLY and SHOULD only be used
2297 * by the lttng command line program. It exists to avoid using URI parsing in
2298 * the lttng client.
2299 *
2300 * We need the date and time for the trace path subdirectory for the case where
2301 * the user does NOT define one using either -o or -U. Using the normal
2302 * lttng_create_session API call, we have no clue on the session daemon side if
2303 * the URL was generated automatically by the client or define by the user.
2304 *
2305 * So this function "wrapper" is hidden from the public API, takes the datetime
2306 * string and appends it if necessary to the URI subdirectory before sending it
2307 * to the session daemon.
2308 *
2309 * With this extra function, the lttng_create_session call behavior is not
2310 * changed and the timestamp is appended to the URI on the session daemon side
2311 * if necessary.
2312 */
2313int _lttng_create_session_ext(const char *name, const char *url,
2314 const char *datetime)
2315{
3dd05a85 2316 int ret;
07424f16
DG
2317 ssize_t size;
2318 struct lttcomm_session_msg lsm;
2319 struct lttng_uri *uris = NULL;
2320
2bba9e53 2321 if (name == NULL || datetime == NULL) {
2f70b271 2322 return -LTTNG_ERR_INVALID;
07424f16
DG
2323 }
2324
2325 memset(&lsm, 0, sizeof(lsm));
2326
2327 lsm.cmd_type = LTTNG_CREATE_SESSION;
cac3069d 2328 lttng_ctl_copy_string(lsm.session.name, name, sizeof(lsm.session.name));
07424f16 2329
9ae110e2 2330 /* There should never be a data URL. */
bc894455 2331 size = uri_parse_str_urls(url, NULL, &uris);
07424f16 2332 if (size < 0) {
3dd05a85
DG
2333 ret = -LTTNG_ERR_INVALID;
2334 goto error;
07424f16
DG
2335 }
2336
2337 lsm.u.uri.size = size;
2338
4b35a6b3 2339 if (size > 0 && uris[0].dtype != LTTNG_DST_PATH && strlen(uris[0].subdir) == 0) {
da4aa2b8
DG
2340 /* Don't append datetime if the name was automatically created. */
2341 if (strncmp(name, DEFAULT_SESSION_NAME "-",
2342 strlen(DEFAULT_SESSION_NAME) + 1)) {
2343 ret = snprintf(uris[0].subdir, sizeof(uris[0].subdir), "%s-%s",
2344 name, datetime);
2345 } else {
2346 ret = snprintf(uris[0].subdir, sizeof(uris[0].subdir), "%s", name);
2347 }
07424f16
DG
2348 if (ret < 0) {
2349 PERROR("snprintf uri subdir");
3dd05a85
DG
2350 ret = -LTTNG_ERR_FATAL;
2351 goto error;
07424f16
DG
2352 }
2353 }
2354
795a978d 2355 ret = lttng_ctl_ask_sessiond_varlen_no_cmd_header(&lsm, uris,
cac3069d 2356 sizeof(struct lttng_uri) * size, NULL);
3dd05a85
DG
2357
2358error:
2359 free(uris);
2360 return ret;
07424f16
DG
2361}
2362
806e2684
DG
2363/*
2364 * For a given session name, this call checks if the data is ready to be read
2365 * or is still being extracted by the consumer(s) hence not ready to be used by
2366 * any readers.
2367 */
6d805429 2368int lttng_data_pending(const char *session_name)
806e2684
DG
2369{
2370 int ret;
2371 struct lttcomm_session_msg lsm;
f6151c55 2372 uint8_t *pending = NULL;
806e2684
DG
2373
2374 if (session_name == NULL) {
2375 return -LTTNG_ERR_INVALID;
2376 }
2377
53efb85a 2378 memset(&lsm, 0, sizeof(lsm));
6d805429 2379 lsm.cmd_type = LTTNG_DATA_PENDING;
806e2684 2380
cac3069d
DG
2381 lttng_ctl_copy_string(lsm.session.name, session_name,
2382 sizeof(lsm.session.name));
806e2684 2383
f6151c55
JG
2384 ret = lttng_ctl_ask_sessiond(&lsm, (void **) &pending);
2385 if (ret < 0) {
2386 goto end;
2387 } else if (ret != 1) {
2388 /* Unexpected payload size */
2389 ret = -LTTNG_ERR_INVALID;
2390 goto end;
806e2684
DG
2391 }
2392
f6151c55
JG
2393 ret = (int) *pending;
2394end:
2395 free(pending);
806e2684
DG
2396 return ret;
2397}
2398
27babd3a
DG
2399/*
2400 * Create a session exclusively used for snapshot.
2401 *
2402 * Returns LTTNG_OK on success or a negative error code.
2403 */
2404int lttng_create_session_snapshot(const char *name, const char *snapshot_url)
2405{
2406 int ret;
2407 ssize_t size;
2408 struct lttcomm_session_msg lsm;
2409 struct lttng_uri *uris = NULL;
2410
2411 if (name == NULL) {
2412 return -LTTNG_ERR_INVALID;
2413 }
2414
2415 memset(&lsm, 0, sizeof(lsm));
2416
2417 lsm.cmd_type = LTTNG_CREATE_SESSION_SNAPSHOT;
2418 lttng_ctl_copy_string(lsm.session.name, name, sizeof(lsm.session.name));
2419
2420 size = uri_parse_str_urls(snapshot_url, NULL, &uris);
2421 if (size < 0) {
2422 return -LTTNG_ERR_INVALID;
2423 }
2424
2425 lsm.u.uri.size = size;
2426
795a978d 2427 ret = lttng_ctl_ask_sessiond_varlen_no_cmd_header(&lsm, uris,
27babd3a
DG
2428 sizeof(struct lttng_uri) * size, NULL);
2429
2430 free(uris);
2431 return ret;
2432}
2433
ecc48a90
JD
2434/*
2435 * Create a session exclusively used for live.
2436 *
2437 * Returns LTTNG_OK on success or a negative error code.
2438 */
2439int lttng_create_session_live(const char *name, const char *url,
2440 unsigned int timer_interval)
2441{
2442 int ret;
2443 ssize_t size;
2444 struct lttcomm_session_msg lsm;
2445 struct lttng_uri *uris = NULL;
2446
92805ee4 2447 if (name == NULL || timer_interval == 0) {
ecc48a90
JD
2448 return -LTTNG_ERR_INVALID;
2449 }
2450
2451 memset(&lsm, 0, sizeof(lsm));
2452
2453 lsm.cmd_type = LTTNG_CREATE_SESSION_LIVE;
2454 lttng_ctl_copy_string(lsm.session.name, name, sizeof(lsm.session.name));
2455
1a241656
DG
2456 if (url) {
2457 size = uri_parse_str_urls(url, NULL, &uris);
2458 if (size <= 0) {
2459 ret = -LTTNG_ERR_INVALID;
2460 goto end;
2461 }
ecc48a90 2462
1a241656
DG
2463 /* file:// is not accepted for live session. */
2464 if (uris[0].dtype == LTTNG_DST_PATH) {
2465 ret = -LTTNG_ERR_INVALID;
2466 goto end;
2467 }
2468 } else {
2469 size = 0;
ecc48a90
JD
2470 }
2471
2472 lsm.u.session_live.nb_uri = size;
2473 lsm.u.session_live.timer_interval = timer_interval;
2474
795a978d 2475 ret = lttng_ctl_ask_sessiond_varlen_no_cmd_header(&lsm, uris,
ecc48a90
JD
2476 sizeof(struct lttng_uri) * size, NULL);
2477
2478end:
2479 free(uris);
2480 return ret;
2481}
2482
a5dfbb9d
MD
2483/*
2484 * List PIDs in the tracker.
2485 *
1b18ce93
JG
2486 * enabled is set to whether the PID tracker is enabled.
2487 * pids is set to an allocated array of PIDs currently tracked. On
2488 * success, pids must be freed by the caller.
2489 * nr_pids is set to the number of entries contained by the pids array.
a5dfbb9d
MD
2490 *
2491 * Returns 0 on success, else a negative LTTng error code.
2492 */
2493int lttng_list_tracker_pids(struct lttng_handle *handle,
2494 int *_enabled, int32_t **_pids, size_t *_nr_pids)
2495{
ebbf5ab7
JR
2496 int ret;
2497 int enabled = 1;
a5dfbb9d
MD
2498 struct lttcomm_session_msg lsm;
2499 size_t nr_pids;
2500 int32_t *pids;
2501
2502 if (handle == NULL) {
2503 return -LTTNG_ERR_INVALID;
2504 }
2505
2506 memset(&lsm, 0, sizeof(lsm));
2507 lsm.cmd_type = LTTNG_LIST_TRACKER_PIDS;
2508 lttng_ctl_copy_string(lsm.session.name, handle->session_name,
2509 sizeof(lsm.session.name));
2510 lttng_ctl_copy_lttng_domain(&lsm.domain, &handle->domain);
2511
2512 ret = lttng_ctl_ask_sessiond(&lsm, (void **) &pids);
2513 if (ret < 0) {
2514 return ret;
2515 }
2516 nr_pids = ret / sizeof(int32_t);
2517 if (nr_pids == 1 && pids[0] == -1) {
2518 free(pids);
2519 pids = NULL;
2520 enabled = 0;
2521 nr_pids = 0;
2522 }
2523 *_enabled = enabled;
2524 *_pids = pids;
2525 *_nr_pids = nr_pids;
2526 return 0;
2527}
2528
93ec662e
JD
2529/*
2530 * Regenerate the metadata for a session.
2531 * Return 0 on success, a negative error code on error.
2532 */
eded6438 2533int lttng_regenerate_metadata(const char *session_name)
93ec662e
JD
2534{
2535 int ret;
2536 struct lttcomm_session_msg lsm;
2537
2538 if (!session_name) {
2539 ret = -LTTNG_ERR_INVALID;
2540 goto end;
2541 }
2542
2543 memset(&lsm, 0, sizeof(lsm));
eded6438 2544 lsm.cmd_type = LTTNG_REGENERATE_METADATA;
93ec662e
JD
2545
2546 lttng_ctl_copy_string(lsm.session.name, session_name,
2547 sizeof(lsm.session.name));
2548
2549 ret = lttng_ctl_ask_sessiond(&lsm, NULL);
2550 if (ret < 0) {
2551 goto end;
2552 }
2553
2554 ret = 0;
2555end:
2556 return ret;
2557}
2558
eded6438
JD
2559/*
2560 * Deprecated, replaced by lttng_regenerate_metadata.
2561 */
2562int lttng_metadata_regenerate(const char *session_name)
2563{
2564 return lttng_regenerate_metadata(session_name);
2565}
2566
c2561365
JD
2567/*
2568 * Regenerate the statedump of a session.
2569 * Return 0 on success, a negative error code on error.
2570 */
2571int lttng_regenerate_statedump(const char *session_name)
2572{
2573 int ret;
2574 struct lttcomm_session_msg lsm;
2575
2576 if (!session_name) {
2577 ret = -LTTNG_ERR_INVALID;
2578 goto end;
2579 }
2580
2581 memset(&lsm, 0, sizeof(lsm));
2582 lsm.cmd_type = LTTNG_REGENERATE_STATEDUMP;
2583
2584 lttng_ctl_copy_string(lsm.session.name, session_name,
2585 sizeof(lsm.session.name));
2586
2587 ret = lttng_ctl_ask_sessiond(&lsm, NULL);
2588 if (ret < 0) {
2589 goto end;
2590 }
2591
2592 ret = 0;
2593end:
2594 return ret;
2595}
2596
a58c490f
JG
2597int lttng_register_trigger(struct lttng_trigger *trigger)
2598{
2599 int ret;
2600 struct lttcomm_session_msg lsm;
2601 char *trigger_buf = NULL;
2602 ssize_t trigger_size;
2603
2604 if (!trigger) {
2605 ret = -LTTNG_ERR_INVALID;
2606 goto end;
2607 }
2608
2609 if (!lttng_trigger_validate(trigger)) {
eac4828d 2610 ret = -LTTNG_ERR_INVALID_TRIGGER;
a58c490f
JG
2611 goto end;
2612 }
2613
2614 trigger_size = lttng_trigger_serialize(trigger, NULL);
2615 if (trigger_size < 0) {
2616 ret = -LTTNG_ERR_UNK;
2617 goto end;
2618 }
2619
2620 trigger_buf = zmalloc(trigger_size);
2621 if (!trigger_buf) {
2622 ret = -LTTNG_ERR_NOMEM;
2623 goto end;
2624 }
2625
2626 memset(&lsm, 0, sizeof(lsm));
2627 lsm.cmd_type = LTTNG_REGISTER_TRIGGER;
2628 if (lttng_trigger_serialize(trigger, trigger_buf) < 0) {
2629 ret = -LTTNG_ERR_UNK;
2630 goto end;
2631 }
2632
2633 lsm.u.trigger.length = (uint32_t) trigger_size;
2634 ret = lttng_ctl_ask_sessiond_varlen_no_cmd_header(&lsm, trigger_buf,
2635 trigger_size, NULL);
2636end:
2637 free(trigger_buf);
2638 return ret;
2639}
2640
2641int lttng_unregister_trigger(struct lttng_trigger *trigger)
2642{
2643 int ret;
2644 struct lttcomm_session_msg lsm;
2645 char *trigger_buf = NULL;
2646 ssize_t trigger_size;
2647
2648 if (!trigger) {
2649 ret = -LTTNG_ERR_INVALID;
2650 goto end;
2651 }
2652
2653 if (!lttng_trigger_validate(trigger)) {
2654 ret = -LTTNG_ERR_INVALID;
2655 goto end;
2656 }
2657
2658 trigger_size = lttng_trigger_serialize(trigger, NULL);
2659 if (trigger_size < 0) {
2660 ret = -LTTNG_ERR_UNK;
2661 goto end;
2662 }
2663
2664 trigger_buf = zmalloc(trigger_size);
2665 if (!trigger_buf) {
2666 ret = -LTTNG_ERR_NOMEM;
2667 goto end;
2668 }
2669
2670 memset(&lsm, 0, sizeof(lsm));
2671 lsm.cmd_type = LTTNG_UNREGISTER_TRIGGER;
2672 if (lttng_trigger_serialize(trigger, trigger_buf) < 0) {
2673 ret = -LTTNG_ERR_UNK;
2674 goto end;
2675 }
2676
2677 lsm.u.trigger.length = (uint32_t) trigger_size;
2678 ret = lttng_ctl_ask_sessiond_varlen_no_cmd_header(&lsm, trigger_buf,
2679 trigger_size, NULL);
2680end:
2681 free(trigger_buf);
2682 return ret;
2683}
2684
fac6795d 2685/*
9ae110e2 2686 * lib constructor.
fac6795d 2687 */
b2b89e8a 2688static void __attribute__((constructor)) init(void)
fac6795d
DG
2689{
2690 /* Set default session group */
bbccc3d2 2691 lttng_set_tracing_group(DEFAULT_TRACING_GROUP);
fac6795d 2692}
49cca668
DG
2693
2694/*
9ae110e2 2695 * lib destructor.
49cca668 2696 */
b2b89e8a 2697static void __attribute__((destructor)) lttng_ctl_exit(void)
49cca668
DG
2698{
2699 free(tracing_group);
2700}
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