Filter: index array, sequences, implement bitwise binary operators
[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 }
137b9942
DG
890 if (print_xml) {
891 ret = filter_visitor_print_xml(ctx, stdout, 0);
892 if (ret) {
893 fflush(stdout);
894 fprintf(stderr, "XML print error\n");
895 ret = -LTTNG_ERR_FILTER_INVAL;
896 goto parse_error;
897 }
898 }
899
900 dbg_printf("Generating IR... ");
901 fflush(stdout);
902 ret = filter_visitor_ir_generate(ctx);
903 if (ret) {
904 fprintf(stderr, "Generate IR error\n");
905 ret = -LTTNG_ERR_FILTER_INVAL;
906 goto parse_error;
907 }
908 dbg_printf("done\n");
909
910 dbg_printf("Validating IR... ");
911 fflush(stdout);
912 ret = filter_visitor_ir_check_binary_op_nesting(ctx);
913 if (ret) {
914 ret = -LTTNG_ERR_FILTER_INVAL;
915 goto parse_error;
916 }
9f449915
PP
917
918 /* Normalize globbing patterns in the expression. */
919 ret = filter_visitor_ir_normalize_glob_patterns(ctx);
920 if (ret) {
921 ret = -LTTNG_ERR_FILTER_INVAL;
922 goto parse_error;
923 }
924
9ae110e2 925 /* Validate strings used as literals in the expression. */
dcd5daf2
JG
926 ret = filter_visitor_ir_validate_string(ctx);
927 if (ret) {
928 ret = -LTTNG_ERR_FILTER_INVAL;
929 goto parse_error;
930 }
9f449915
PP
931
932 /* Validate globbing patterns in the expression. */
933 ret = filter_visitor_ir_validate_globbing(ctx);
934 if (ret) {
935 ret = -LTTNG_ERR_FILTER_INVAL;
936 goto parse_error;
937 }
938
137b9942
DG
939 dbg_printf("done\n");
940
941 dbg_printf("Generating bytecode... ");
942 fflush(stdout);
943 ret = filter_visitor_bytecode_generate(ctx);
944 if (ret) {
945 fprintf(stderr, "Generate bytecode error\n");
946 ret = -LTTNG_ERR_FILTER_INVAL;
947 goto parse_error;
948 }
949 dbg_printf("done\n");
950 dbg_printf("Size of bytecode generated: %u bytes.\n",
951 bytecode_get_len(&ctx->bytecode->b));
952
953 lsm->u.enable.bytecode_len = sizeof(ctx->bytecode->b)
954 + bytecode_get_len(&ctx->bytecode->b);
955 lsm->u.enable.expression_len = strlen(filter_expression) + 1;
956
957 /* No need to keep the memory stream. */
958 if (fclose(fmem) != 0) {
6f04ed72 959 PERROR("fclose");
137b9942
DG
960 }
961
962 *ctxp = ctx;
963 return 0;
964
965parse_error:
137b9942
DG
966 filter_ir_free(ctx);
967 filter_parser_ctx_free(ctx);
968filter_alloc_error:
969 if (fclose(fmem) != 0) {
6f04ed72 970 PERROR("fclose");
137b9942
DG
971 }
972error:
973 return ret;
974}
975
93deb080
JI
976/*
977 * Enable event(s) for a channel, possibly with exclusions and a filter.
978 * If no event name is specified, all events are enabled.
979 * If no channel name is specified, the default name is used.
980 * If filter expression is not NULL, the filter is set for the event.
981 * If exclusion count is not zero, the exclusions are set for the event.
982 * Returns size of returned session payload data or a negative error code.
983 */
984int lttng_enable_event_with_exclusions(struct lttng_handle *handle,
985 struct lttng_event *ev, const char *channel_name,
e9efbcd3 986 const char *original_filter_expression,
93deb080
JI
987 int exclusion_count, char **exclusion_list)
988{
989 struct lttcomm_session_msg lsm;
64226865 990 char *varlen_data;
93deb080 991 int ret = 0;
137b9942 992 unsigned int free_filter_expression = 0;
93deb080 993 struct filter_parser_ctx *ctx = NULL;
e9efbcd3
JG
994 /*
995 * Cast as non-const since we may replace the filter expression
996 * by a dynamically allocated string. Otherwise, the original
997 * string is not modified.
998 */
999 char *filter_expression = (char *) original_filter_expression;
93deb080
JI
1000
1001 if (handle == NULL || ev == NULL) {
137b9942
DG
1002 ret = -LTTNG_ERR_INVALID;
1003 goto error;
93deb080
JI
1004 }
1005
9ae110e2
JG
1006 /*
1007 * Empty filter string will always be rejected by the parser
93deb080
JI
1008 * anyway, so treat this corner-case early to eliminate
1009 * lttng_fmemopen error for 0-byte allocation.
1010 */
1011 if (filter_expression && filter_expression[0] == '\0') {
137b9942
DG
1012 ret = -LTTNG_ERR_INVALID;
1013 goto error;
93deb080
JI
1014 }
1015
1016 memset(&lsm, 0, sizeof(lsm));
1017
1018 /* If no channel name, send empty string. */
1019 if (channel_name == NULL) {
1020 lttng_ctl_copy_string(lsm.u.enable.channel_name, "",
1021 sizeof(lsm.u.enable.channel_name));
1022 } else {
1023 lttng_ctl_copy_string(lsm.u.enable.channel_name, channel_name,
1024 sizeof(lsm.u.enable.channel_name));
1025 }
1026
18a720cd
MD
1027 lsm.cmd_type = LTTNG_ENABLE_EVENT;
1028 if (ev->name[0] == '\0') {
1029 /* Enable all events */
1030 lttng_ctl_copy_string(ev->name, "*", sizeof(ev->name));
6565421f 1031 }
93deb080 1032
6565421f 1033 lttng_ctl_copy_lttng_domain(&lsm.domain, &handle->domain);
6e911cad 1034 /* FIXME: copying non-packed struct to packed struct. */
93deb080
JI
1035 memcpy(&lsm.u.enable.event, ev, sizeof(lsm.u.enable.event));
1036
1037 lttng_ctl_copy_string(lsm.session.name, handle->session_name,
1038 sizeof(lsm.session.name));
1039 lsm.u.enable.exclusion_count = exclusion_count;
1040 lsm.u.enable.bytecode_len = 0;
1041
9b21e6d5
DG
1042 /*
1043 * For the JUL domain, a filter is enforced except for the enable all
1044 * event. This is done to avoid having the event in all sessions thus
1045 * filtering by logger name.
1046 */
1047 if (exclusion_count == 0 && filter_expression == NULL &&
5cdb6027 1048 (handle->domain.type != LTTNG_DOMAIN_JUL &&
0e115563
DG
1049 handle->domain.type != LTTNG_DOMAIN_LOG4J &&
1050 handle->domain.type != LTTNG_DOMAIN_PYTHON)) {
3e1c9ff7 1051 goto ask_sessiond;
93deb080
JI
1052 }
1053
1054 /*
1055 * We have either a filter or some exclusions, so we need to set up
9ae110e2 1056 * a variable-length memory block from where to send the data.
93deb080
JI
1057 */
1058
9ae110e2 1059 /* Parse filter expression. */
5cdb6027 1060 if (filter_expression != NULL || handle->domain.type == LTTNG_DOMAIN_JUL
0e115563
DG
1061 || handle->domain.type == LTTNG_DOMAIN_LOG4J
1062 || handle->domain.type == LTTNG_DOMAIN_PYTHON) {
5cdb6027 1063 if (handle->domain.type == LTTNG_DOMAIN_JUL ||
0e115563
DG
1064 handle->domain.type == LTTNG_DOMAIN_LOG4J ||
1065 handle->domain.type == LTTNG_DOMAIN_PYTHON) {
1066 char *agent_filter;
64226865 1067
347c5ab5 1068 /* Setup JUL filter if needed. */
0e115563
DG
1069 agent_filter = set_agent_filter(filter_expression, ev);
1070 if (!agent_filter) {
137b9942 1071 if (!filter_expression) {
9ae110e2
JG
1072 /*
1073 * No JUL and no filter, just skip
1074 * everything below.
1075 */
137b9942
DG
1076 goto ask_sessiond;
1077 }
64226865
DG
1078 } else {
1079 /*
9ae110e2
JG
1080 * With an agent filter, the original filter has
1081 * been added to it thus replace the filter
1082 * expression.
64226865 1083 */
0e115563 1084 filter_expression = agent_filter;
e9efbcd3 1085 free_filter_expression = 1;
9b21e6d5 1086 }
9b21e6d5 1087 }
93deb080 1088
137b9942 1089 ret = generate_filter(filter_expression, &lsm, &ctx);
93deb080 1090 if (ret) {
137b9942 1091 goto filter_error;
93deb080 1092 }
6b453b5e
JG
1093 }
1094
1095 varlen_data = zmalloc(lsm.u.enable.bytecode_len
137b9942
DG
1096 + lsm.u.enable.expression_len
1097 + LTTNG_SYMBOL_NAME_LEN * exclusion_count);
6b453b5e
JG
1098 if (!varlen_data) {
1099 ret = -LTTNG_ERR_EXCLUSION_NOMEM;
7ca1dc6f 1100 goto mem_error;
6b453b5e 1101 }
137b9942 1102
9ae110e2 1103 /* Put exclusion names first in the data. */
6b453b5e
JG
1104 while (exclusion_count--) {
1105 strncpy(varlen_data + LTTNG_SYMBOL_NAME_LEN * exclusion_count,
0c82ac62
PP
1106 *(exclusion_list + exclusion_count),
1107 LTTNG_SYMBOL_NAME_LEN - 1);
6b453b5e 1108 }
9ae110e2 1109 /* Add filter expression next. */
6b453b5e
JG
1110 if (lsm.u.enable.expression_len != 0) {
1111 memcpy(varlen_data
1112 + LTTNG_SYMBOL_NAME_LEN * lsm.u.enable.exclusion_count,
1113 filter_expression,
1114 lsm.u.enable.expression_len);
1115 }
9ae110e2 1116 /* Add filter bytecode next. */
137b9942 1117 if (ctx && lsm.u.enable.bytecode_len != 0) {
6b453b5e
JG
1118 memcpy(varlen_data
1119 + LTTNG_SYMBOL_NAME_LEN * lsm.u.enable.exclusion_count
1120 + lsm.u.enable.expression_len,
1121 &ctx->bytecode->b,
1122 lsm.u.enable.bytecode_len);
93deb080
JI
1123 }
1124
795a978d 1125 ret = lttng_ctl_ask_sessiond_varlen_no_cmd_header(&lsm, varlen_data,
67676bd8 1126 (LTTNG_SYMBOL_NAME_LEN * lsm.u.enable.exclusion_count) +
9ae110e2
JG
1127 lsm.u.enable.bytecode_len + lsm.u.enable.expression_len,
1128 NULL);
6b453b5e 1129 free(varlen_data);
93deb080 1130
7ca1dc6f
DG
1131mem_error:
1132 if (filter_expression && ctx) {
93deb080
JI
1133 filter_bytecode_free(ctx);
1134 filter_ir_free(ctx);
1135 filter_parser_ctx_free(ctx);
7ca1dc6f
DG
1136 }
1137filter_error:
1138 if (free_filter_expression) {
1139 /*
9ae110e2
JG
1140 * The filter expression has been replaced and must be freed as
1141 * it is not the original filter expression received as a
1142 * parameter.
7ca1dc6f
DG
1143 */
1144 free(filter_expression);
93deb080 1145 }
137b9942
DG
1146error:
1147 /*
9ae110e2
JG
1148 * Return directly to the caller and don't ask the sessiond since
1149 * something went wrong in the parsing of data above.
137b9942 1150 */
93deb080 1151 return ret;
3e1c9ff7
DG
1152
1153ask_sessiond:
1154 ret = lttng_ctl_ask_sessiond(&lsm, NULL);
1155 return ret;
93deb080
JI
1156}
1157
6e911cad
MD
1158int lttng_disable_event_ext(struct lttng_handle *handle,
1159 struct lttng_event *ev, const char *channel_name,
1160 const char *original_filter_expression)
1df4dedd 1161{
cd80958d 1162 struct lttcomm_session_msg lsm;
6e911cad
MD
1163 char *varlen_data;
1164 int ret = 0;
1165 unsigned int free_filter_expression = 0;
1166 struct filter_parser_ctx *ctx = NULL;
1167 /*
1168 * Cast as non-const since we may replace the filter expression
1169 * by a dynamically allocated string. Otherwise, the original
1170 * string is not modified.
1171 */
1172 char *filter_expression = (char *) original_filter_expression;
1df4dedd 1173
6e911cad
MD
1174 if (handle == NULL || ev == NULL) {
1175 ret = -LTTNG_ERR_INVALID;
1176 goto error;
1177 }
1178
9ae110e2
JG
1179 /*
1180 * Empty filter string will always be rejected by the parser
6e911cad
MD
1181 * anyway, so treat this corner-case early to eliminate
1182 * lttng_fmemopen error for 0-byte allocation.
1183 */
1184 if (filter_expression && filter_expression[0] == '\0') {
1185 ret = -LTTNG_ERR_INVALID;
1186 goto error;
cd80958d
DG
1187 }
1188
441c16a7
MD
1189 memset(&lsm, 0, sizeof(lsm));
1190
85076754
MD
1191 /* If no channel name, send empty string. */
1192 if (channel_name == NULL) {
1193 lttng_ctl_copy_string(lsm.u.disable.channel_name, "",
cd80958d 1194 sizeof(lsm.u.disable.channel_name));
f3ed775e 1195 } else {
85076754 1196 lttng_ctl_copy_string(lsm.u.disable.channel_name, channel_name,
cd80958d 1197 sizeof(lsm.u.disable.channel_name));
eb354453
DG
1198 }
1199
18a720cd 1200 lsm.cmd_type = LTTNG_DISABLE_EVENT;
f3ed775e 1201
6e911cad
MD
1202 lttng_ctl_copy_lttng_domain(&lsm.domain, &handle->domain);
1203 /* FIXME: copying non-packed struct to packed struct. */
1204 memcpy(&lsm.u.disable.event, ev, sizeof(lsm.u.disable.event));
1205
cac3069d 1206 lttng_ctl_copy_string(lsm.session.name, handle->session_name,
cd80958d 1207 sizeof(lsm.session.name));
6e911cad 1208 lsm.u.disable.bytecode_len = 0;
cd80958d 1209
6e911cad
MD
1210 /*
1211 * For the JUL domain, a filter is enforced except for the
1212 * disable all event. This is done to avoid having the event in
1213 * all sessions thus filtering by logger name.
1214 */
1215 if (filter_expression == NULL &&
1216 (handle->domain.type != LTTNG_DOMAIN_JUL &&
0e115563
DG
1217 handle->domain.type != LTTNG_DOMAIN_LOG4J &&
1218 handle->domain.type != LTTNG_DOMAIN_PYTHON)) {
6e911cad
MD
1219 goto ask_sessiond;
1220 }
1221
1222 /*
1223 * We have a filter, so we need to set up a variable-length
1224 * memory block from where to send the data.
1225 */
1226
1227 /* Parse filter expression */
1228 if (filter_expression != NULL || handle->domain.type == LTTNG_DOMAIN_JUL
0e115563
DG
1229 || handle->domain.type == LTTNG_DOMAIN_LOG4J
1230 || handle->domain.type == LTTNG_DOMAIN_PYTHON) {
6e911cad 1231 if (handle->domain.type == LTTNG_DOMAIN_JUL ||
0e115563
DG
1232 handle->domain.type == LTTNG_DOMAIN_LOG4J ||
1233 handle->domain.type == LTTNG_DOMAIN_PYTHON) {
1234 char *agent_filter;
6e911cad
MD
1235
1236 /* Setup JUL filter if needed. */
0e115563
DG
1237 agent_filter = set_agent_filter(filter_expression, ev);
1238 if (!agent_filter) {
6e911cad 1239 if (!filter_expression) {
9ae110e2
JG
1240 /*
1241 * No JUL and no filter, just skip
1242 * everything below.
1243 */
6e911cad
MD
1244 goto ask_sessiond;
1245 }
1246 } else {
1247 /*
9ae110e2
JG
1248 * With a JUL filter, the original filter has
1249 * been added to it thus replace the filter
1250 * expression.
6e911cad 1251 */
0e115563 1252 filter_expression = agent_filter;
6e911cad
MD
1253 free_filter_expression = 1;
1254 }
1255 }
1256
1257 ret = generate_filter(filter_expression, &lsm, &ctx);
1258 if (ret) {
1259 goto filter_error;
1260 }
1261 }
1262
1263 varlen_data = zmalloc(lsm.u.disable.bytecode_len
1264 + lsm.u.disable.expression_len);
1265 if (!varlen_data) {
1266 ret = -LTTNG_ERR_EXCLUSION_NOMEM;
1267 goto mem_error;
1268 }
1269
9ae110e2 1270 /* Add filter expression. */
6e911cad
MD
1271 if (lsm.u.disable.expression_len != 0) {
1272 memcpy(varlen_data,
1273 filter_expression,
1274 lsm.u.disable.expression_len);
1275 }
9ae110e2 1276 /* Add filter bytecode next. */
6e911cad
MD
1277 if (ctx && lsm.u.disable.bytecode_len != 0) {
1278 memcpy(varlen_data
1279 + lsm.u.disable.expression_len,
1280 &ctx->bytecode->b,
1281 lsm.u.disable.bytecode_len);
1282 }
1283
795a978d 1284 ret = lttng_ctl_ask_sessiond_varlen_no_cmd_header(&lsm, varlen_data,
6e911cad
MD
1285 lsm.u.disable.bytecode_len + lsm.u.disable.expression_len, NULL);
1286 free(varlen_data);
1287
1288mem_error:
1289 if (filter_expression && ctx) {
1290 filter_bytecode_free(ctx);
1291 filter_ir_free(ctx);
1292 filter_parser_ctx_free(ctx);
1293 }
1294filter_error:
1295 if (free_filter_expression) {
1296 /*
9ae110e2
JG
1297 * The filter expression has been replaced and must be freed as
1298 * it is not the original filter expression received as a
1299 * parameter.
6e911cad
MD
1300 */
1301 free(filter_expression);
1302 }
1303error:
1304 /*
9ae110e2
JG
1305 * Return directly to the caller and don't ask the sessiond since
1306 * something went wrong in the parsing of data above.
6e911cad
MD
1307 */
1308 return ret;
1309
1310ask_sessiond:
1311 ret = lttng_ctl_ask_sessiond(&lsm, NULL);
1312 return ret;
1313}
1314
1315/*
9ae110e2
JG
1316 * Disable event(s) of a channel and domain.
1317 * If no event name is specified, all events are disabled.
1318 * If no channel name is specified, the default 'channel0' is used.
1319 * Returns size of returned session payload data or a negative error code.
6e911cad
MD
1320 */
1321int lttng_disable_event(struct lttng_handle *handle, const char *name,
1322 const char *channel_name)
1323{
1324 struct lttng_event ev;
1325
1326 memset(&ev, 0, sizeof(ev));
9b7431cf 1327 ev.loglevel = -1;
6e911cad
MD
1328 ev.type = LTTNG_EVENT_ALL;
1329 lttng_ctl_copy_string(ev.name, name, sizeof(ev.name));
1330 return lttng_disable_event_ext(handle, &ev, channel_name, NULL);
1df4dedd
DG
1331}
1332
cf0bcb51
JG
1333struct lttng_channel *lttng_channel_create(struct lttng_domain *domain)
1334{
1335 struct lttng_channel *channel = NULL;
1336 struct lttng_channel_extended *extended = NULL;
1337
1338 if (!domain) {
1339 goto error;
1340 }
1341
1342 /* Validate domain. */
1343 switch (domain->type) {
1344 case LTTNG_DOMAIN_UST:
1345 switch (domain->buf_type) {
1346 case LTTNG_BUFFER_PER_UID:
1347 case LTTNG_BUFFER_PER_PID:
1348 break;
1349 default:
1350 goto error;
1351 }
1352 break;
1353 case LTTNG_DOMAIN_KERNEL:
1354 if (domain->buf_type != LTTNG_BUFFER_GLOBAL) {
1355 goto error;
1356 }
1357 break;
1358 default:
1359 goto error;
1360 }
1361
1362 channel = zmalloc(sizeof(*channel));
1363 if (!channel) {
1364 goto error;
1365 }
1366
1367 extended = zmalloc(sizeof(*extended));
1368 if (!extended) {
1369 goto error;
1370 }
1371
1372 channel->attr.extended.ptr = extended;
1373
1374 lttng_channel_set_default_attr(domain, &channel->attr);
1375 return channel;
1376error:
1377 free(channel);
1378 free(extended);
1379 return NULL;
1380}
1381
1382void lttng_channel_destroy(struct lttng_channel *channel)
1383{
1384 if (!channel) {
1385 return;
1386 }
1387
1388 if (channel->attr.extended.ptr) {
1389 free(channel->attr.extended.ptr);
1390 }
1391 free(channel);
1392}
1393
1df4dedd 1394/*
9ae110e2
JG
1395 * Enable channel per domain
1396 * Returns size of returned session payload data or a negative error code.
a5c5a2bd 1397 */
cd80958d 1398int lttng_enable_channel(struct lttng_handle *handle,
cf0bcb51 1399 struct lttng_channel *in_chan)
a5c5a2bd 1400{
cd80958d
DG
1401 struct lttcomm_session_msg lsm;
1402
9ae110e2 1403 /* NULL arguments are forbidden. No default values. */
cf0bcb51 1404 if (handle == NULL || in_chan == NULL) {
2f70b271 1405 return -LTTNG_ERR_INVALID;
cd80958d
DG
1406 }
1407
441c16a7 1408 memset(&lsm, 0, sizeof(lsm));
cf0bcb51
JG
1409 memcpy(&lsm.u.channel.chan, in_chan, sizeof(lsm.u.channel.chan));
1410 lsm.u.channel.chan.attr.extended.ptr = NULL;
441c16a7 1411
cf0bcb51
JG
1412 if (!in_chan->attr.extended.ptr) {
1413 struct lttng_channel *channel;
1414 struct lttng_channel_extended *extended;
7d29a247 1415
cf0bcb51
JG
1416 channel = lttng_channel_create(&handle->domain);
1417 if (!channel) {
1418 return -LTTNG_ERR_NOMEM;
1419 }
1420
1421 /*
1422 * Create a new channel in order to use default extended
1423 * attribute values.
1424 */
1425 extended = (struct lttng_channel_extended *)
1426 channel->attr.extended.ptr;
1427 memcpy(&lsm.u.channel.extended, extended, sizeof(*extended));
1428 lttng_channel_destroy(channel);
1429 } else {
1430 struct lttng_channel_extended *extended;
1431
1432 extended = (struct lttng_channel_extended *)
1433 in_chan->attr.extended.ptr;
1434 memcpy(&lsm.u.channel.extended, extended, sizeof(*extended));
1435 }
cd80958d 1436
cf0bcb51 1437 lsm.cmd_type = LTTNG_ENABLE_CHANNEL;
cac3069d 1438 lttng_ctl_copy_lttng_domain(&lsm.domain, &handle->domain);
7d29a247 1439
cac3069d 1440 lttng_ctl_copy_string(lsm.session.name, handle->session_name,
cd80958d
DG
1441 sizeof(lsm.session.name));
1442
cac3069d 1443 return lttng_ctl_ask_sessiond(&lsm, NULL);
8c0faa1d 1444}
1df4dedd 1445
2ef84c95 1446/*
9ae110e2
JG
1447 * All tracing will be stopped for registered events of the channel.
1448 * Returns size of returned session payload data or a negative error code.
2ef84c95 1449 */
cd80958d 1450int lttng_disable_channel(struct lttng_handle *handle, const char *name)
2ef84c95 1451{
cd80958d
DG
1452 struct lttcomm_session_msg lsm;
1453
9ae110e2 1454 /* Safety check. Both are mandatory. */
9d697d3d 1455 if (handle == NULL || name == NULL) {
2f70b271 1456 return -LTTNG_ERR_INVALID;
cd80958d
DG
1457 }
1458
441c16a7
MD
1459 memset(&lsm, 0, sizeof(lsm));
1460
cd80958d 1461 lsm.cmd_type = LTTNG_DISABLE_CHANNEL;
1df4dedd 1462
cac3069d 1463 lttng_ctl_copy_string(lsm.u.disable.channel_name, name,
9d697d3d
DG
1464 sizeof(lsm.u.disable.channel_name));
1465
cac3069d 1466 lttng_ctl_copy_lttng_domain(&lsm.domain, &handle->domain);
cd80958d 1467
cac3069d 1468 lttng_ctl_copy_string(lsm.session.name, handle->session_name,
cd80958d
DG
1469 sizeof(lsm.session.name));
1470
cac3069d 1471 return lttng_ctl_ask_sessiond(&lsm, NULL);
ca95a216
DG
1472}
1473
ccf10263 1474/*
9ae110e2
JG
1475 * Add PID to session tracker.
1476 * Return 0 on success else a negative LTTng error code.
ccf10263
MD
1477 */
1478int lttng_track_pid(struct lttng_handle *handle, int pid)
1479{
1480 struct lttcomm_session_msg lsm;
1481
9ae110e2 1482 /* NULL arguments are forbidden. No default values. */
ccf10263
MD
1483 if (handle == NULL) {
1484 return -LTTNG_ERR_INVALID;
1485 }
1486
1487 memset(&lsm, 0, sizeof(lsm));
1488
1489 lsm.cmd_type = LTTNG_TRACK_PID;
1490 lsm.u.pid_tracker.pid = pid;
1491
1492 lttng_ctl_copy_lttng_domain(&lsm.domain, &handle->domain);
1493
1494 lttng_ctl_copy_string(lsm.session.name, handle->session_name,
1495 sizeof(lsm.session.name));
1496
1497 return lttng_ctl_ask_sessiond(&lsm, NULL);
1498}
1499
1500/*
9ae110e2
JG
1501 * Remove PID from session tracker.
1502 * Return 0 on success else a negative LTTng error code.
ccf10263
MD
1503 */
1504int lttng_untrack_pid(struct lttng_handle *handle, int pid)
1505{
1506 struct lttcomm_session_msg lsm;
1507
9ae110e2 1508 /* NULL arguments are forbidden. No default values. */
ccf10263
MD
1509 if (handle == NULL) {
1510 return -LTTNG_ERR_INVALID;
1511 }
1512
1513 memset(&lsm, 0, sizeof(lsm));
1514
1515 lsm.cmd_type = LTTNG_UNTRACK_PID;
1516 lsm.u.pid_tracker.pid = pid;
1517
1518 lttng_ctl_copy_lttng_domain(&lsm.domain, &handle->domain);
1519
1520 lttng_ctl_copy_string(lsm.session.name, handle->session_name,
1521 sizeof(lsm.session.name));
1522
1523 return lttng_ctl_ask_sessiond(&lsm, NULL);
1524}
1525
fac6795d 1526/*
9ae110e2
JG
1527 * Lists all available tracepoints of domain.
1528 * Sets the contents of the events array.
1529 * Returns the number of lttng_event entries in events;
1530 * on error, returns a negative value.
fac6795d 1531 */
cd80958d 1532int lttng_list_tracepoints(struct lttng_handle *handle,
2a71efd5 1533 struct lttng_event **events)
fac6795d 1534{
052da939 1535 int ret;
cd80958d
DG
1536 struct lttcomm_session_msg lsm;
1537
9d697d3d 1538 if (handle == NULL) {
2f70b271 1539 return -LTTNG_ERR_INVALID;
cd80958d 1540 }
fac6795d 1541
53efb85a 1542 memset(&lsm, 0, sizeof(lsm));
cd80958d 1543 lsm.cmd_type = LTTNG_LIST_TRACEPOINTS;
cac3069d 1544 lttng_ctl_copy_lttng_domain(&lsm.domain, &handle->domain);
2a71efd5 1545
cac3069d 1546 ret = lttng_ctl_ask_sessiond(&lsm, (void **) events);
052da939
DG
1547 if (ret < 0) {
1548 return ret;
eb354453 1549 }
fac6795d 1550
9f19cc17 1551 return ret / sizeof(struct lttng_event);
fac6795d
DG
1552}
1553
f37d259d 1554/*
9ae110e2
JG
1555 * Lists all available tracepoint fields of domain.
1556 * Sets the contents of the event field array.
1557 * Returns the number of lttng_event_field entries in events;
1558 * on error, returns a negative value.
f37d259d
MD
1559 */
1560int lttng_list_tracepoint_fields(struct lttng_handle *handle,
1561 struct lttng_event_field **fields)
1562{
1563 int ret;
1564 struct lttcomm_session_msg lsm;
1565
1566 if (handle == NULL) {
2f70b271 1567 return -LTTNG_ERR_INVALID;
f37d259d
MD
1568 }
1569
53efb85a 1570 memset(&lsm, 0, sizeof(lsm));
f37d259d 1571 lsm.cmd_type = LTTNG_LIST_TRACEPOINT_FIELDS;
cac3069d 1572 lttng_ctl_copy_lttng_domain(&lsm.domain, &handle->domain);
f37d259d 1573
cac3069d 1574 ret = lttng_ctl_ask_sessiond(&lsm, (void **) fields);
f37d259d
MD
1575 if (ret < 0) {
1576 return ret;
1577 }
1578
1579 return ret / sizeof(struct lttng_event_field);
1580}
1581
834978fd 1582/*
9ae110e2
JG
1583 * Lists all available kernel system calls. Allocates and sets the contents of
1584 * the events array.
834978fd 1585 *
9ae110e2
JG
1586 * Returns the number of lttng_event entries in events; on error, returns a
1587 * negative value.
834978fd
DG
1588 */
1589int lttng_list_syscalls(struct lttng_event **events)
1590{
1591 int ret;
1592 struct lttcomm_session_msg lsm;
1593
1594 if (!events) {
1595 return -LTTNG_ERR_INVALID;
1596 }
1597
1598 memset(&lsm, 0, sizeof(lsm));
1599 lsm.cmd_type = LTTNG_LIST_SYSCALLS;
1600 /* Force kernel domain for system calls. */
1601 lsm.domain.type = LTTNG_DOMAIN_KERNEL;
1602
1603 ret = lttng_ctl_ask_sessiond(&lsm, (void **) events);
1604 if (ret < 0) {
1605 return ret;
1606 }
1607
1608 return ret / sizeof(struct lttng_event);
1609}
1610
1657e9bb 1611/*
9ae110e2
JG
1612 * Returns a human readable string describing
1613 * the error code (a negative value).
1657e9bb 1614 */
9a745bc7 1615const char *lttng_strerror(int code)
1657e9bb 1616{
f73fabfd 1617 return error_get_str(code);
1657e9bb
DG
1618}
1619
aaf97519 1620/*
a4b92340
DG
1621 * Create a brand new session using name and url for destination.
1622 *
f73fabfd 1623 * Returns LTTNG_OK on success or a negative error code.
00e2e675 1624 */
a4b92340 1625int lttng_create_session(const char *name, const char *url)
00e2e675 1626{
3dd05a85 1627 int ret;
a4b92340 1628 ssize_t size;
00e2e675 1629 struct lttcomm_session_msg lsm;
a4b92340 1630 struct lttng_uri *uris = NULL;
00e2e675 1631
a4b92340 1632 if (name == NULL) {
2f70b271 1633 return -LTTNG_ERR_INVALID;
00e2e675
DG
1634 }
1635
a4b92340 1636 memset(&lsm, 0, sizeof(lsm));
00e2e675 1637
a4b92340 1638 lsm.cmd_type = LTTNG_CREATE_SESSION;
cac3069d 1639 lttng_ctl_copy_string(lsm.session.name, name, sizeof(lsm.session.name));
a4b92340
DG
1640
1641 /* There should never be a data URL */
bc894455 1642 size = uri_parse_str_urls(url, NULL, &uris);
a4b92340 1643 if (size < 0) {
2f70b271 1644 return -LTTNG_ERR_INVALID;
00e2e675
DG
1645 }
1646
a4b92340
DG
1647 lsm.u.uri.size = size;
1648
795a978d 1649 ret = lttng_ctl_ask_sessiond_varlen_no_cmd_header(&lsm, uris,
cac3069d 1650 sizeof(struct lttng_uri) * size, NULL);
3dd05a85
DG
1651
1652 free(uris);
1653 return ret;
00e2e675
DG
1654}
1655
8028d920 1656/*
9ae110e2
JG
1657 * Destroy session using name.
1658 * Returns size of returned session payload data or a negative error code.
8028d920 1659 */
8fd2c92c 1660static
e20ee7c2 1661int _lttng_destroy_session(const char *session_name)
8028d920 1662{
cd80958d
DG
1663 struct lttcomm_session_msg lsm;
1664
843f5df9 1665 if (session_name == NULL) {
2f70b271 1666 return -LTTNG_ERR_INVALID;
cd80958d
DG
1667 }
1668
53efb85a 1669 memset(&lsm, 0, sizeof(lsm));
cd80958d 1670 lsm.cmd_type = LTTNG_DESTROY_SESSION;
843f5df9 1671
cac3069d
DG
1672 lttng_ctl_copy_string(lsm.session.name, session_name,
1673 sizeof(lsm.session.name));
cd80958d 1674
cac3069d 1675 return lttng_ctl_ask_sessiond(&lsm, NULL);
aaf97519
DG
1676}
1677
e20ee7c2
JD
1678/*
1679 * Stop the session and wait for the data before destroying it
1680 */
1681int lttng_destroy_session(const char *session_name)
1682{
1683 int ret;
1684
1685 /*
1686 * Stop the tracing and wait for the data.
1687 */
1688 ret = _lttng_stop_tracing(session_name, 1);
1689 if (ret && ret != -LTTNG_ERR_TRACE_ALREADY_STOPPED) {
1690 goto end;
1691 }
1692
1693 ret = _lttng_destroy_session(session_name);
1694end:
1695 return ret;
1696}
1697
1698/*
1699 * Destroy the session without waiting for the data.
1700 */
1701int lttng_destroy_session_no_wait(const char *session_name)
1702{
1703 int ret;
1704
1705 /*
1706 * Stop the tracing without waiting for the data.
1707 * The session might already have been stopped, so just
1708 * skip this error.
1709 */
1710 ret = _lttng_stop_tracing(session_name, 0);
1711 if (ret && ret != -LTTNG_ERR_TRACE_ALREADY_STOPPED) {
1712 goto end;
1713 }
1714
1715 ret = _lttng_destroy_session(session_name);
1716end:
1717 return ret;
1718}
1719
57167058 1720/*
9ae110e2
JG
1721 * Ask the session daemon for all available sessions.
1722 * Sets the contents of the sessions array.
1723 * Returns the number of lttng_session entries in sessions;
1724 * on error, returns a negative value.
57167058 1725 */
ca95a216 1726int lttng_list_sessions(struct lttng_session **sessions)
57167058 1727{
ca95a216 1728 int ret;
cd80958d 1729 struct lttcomm_session_msg lsm;
57167058 1730
53efb85a 1731 memset(&lsm, 0, sizeof(lsm));
cd80958d 1732 lsm.cmd_type = LTTNG_LIST_SESSIONS;
cac3069d 1733 ret = lttng_ctl_ask_sessiond(&lsm, (void**) sessions);
57167058 1734 if (ret < 0) {
ca95a216 1735 return ret;
57167058
DG
1736 }
1737
ca95a216 1738 return ret / sizeof(struct lttng_session);
57167058
DG
1739}
1740
d7ba1388
MD
1741int lttng_set_session_shm_path(const char *session_name,
1742 const char *shm_path)
1743{
1744 struct lttcomm_session_msg lsm;
1745
1746 if (session_name == NULL) {
1747 return -LTTNG_ERR_INVALID;
1748 }
1749
1750 memset(&lsm, 0, sizeof(lsm));
1751 lsm.cmd_type = LTTNG_SET_SESSION_SHM_PATH;
1752
1753 lttng_ctl_copy_string(lsm.session.name, session_name,
1754 sizeof(lsm.session.name));
1755 lttng_ctl_copy_string(lsm.u.set_shm_path.shm_path, shm_path,
1756 sizeof(lsm.u.set_shm_path.shm_path));
1757
1758 return lttng_ctl_ask_sessiond(&lsm, NULL);
1759}
1760
9f19cc17 1761/*
9ae110e2
JG
1762 * Ask the session daemon for all available domains of a session.
1763 * Sets the contents of the domains array.
1764 * Returns the number of lttng_domain entries in domains;
1765 * on error, returns a negative value.
9f19cc17 1766 */
330be774 1767int lttng_list_domains(const char *session_name,
cd80958d 1768 struct lttng_domain **domains)
9f19cc17
DG
1769{
1770 int ret;
cd80958d
DG
1771 struct lttcomm_session_msg lsm;
1772
330be774 1773 if (session_name == NULL) {
2f70b271 1774 return -LTTNG_ERR_INVALID;
cd80958d 1775 }
9f19cc17 1776
53efb85a 1777 memset(&lsm, 0, sizeof(lsm));
cd80958d
DG
1778 lsm.cmd_type = LTTNG_LIST_DOMAINS;
1779
cac3069d
DG
1780 lttng_ctl_copy_string(lsm.session.name, session_name,
1781 sizeof(lsm.session.name));
cd80958d 1782
cac3069d 1783 ret = lttng_ctl_ask_sessiond(&lsm, (void**) domains);
9f19cc17
DG
1784 if (ret < 0) {
1785 return ret;
1786 }
1787
1788 return ret / sizeof(struct lttng_domain);
1789}
1790
1791/*
9ae110e2
JG
1792 * Ask the session daemon for all available channels of a session.
1793 * Sets the contents of the channels array.
1794 * Returns the number of lttng_channel entries in channels;
1795 * on error, returns a negative value.
9f19cc17 1796 */
cd80958d
DG
1797int lttng_list_channels(struct lttng_handle *handle,
1798 struct lttng_channel **channels)
9f19cc17
DG
1799{
1800 int ret;
53e367f9
JG
1801 size_t channel_count, i;
1802 const size_t channel_size = sizeof(struct lttng_channel) +
cf0bcb51 1803 sizeof(struct lttng_channel_extended);
cd80958d 1804 struct lttcomm_session_msg lsm;
53e367f9 1805 void *extended_at;
cd80958d 1806
9d697d3d 1807 if (handle == NULL) {
53e367f9
JG
1808 ret = -LTTNG_ERR_INVALID;
1809 goto end;
cd80958d
DG
1810 }
1811
53efb85a 1812 memset(&lsm, 0, sizeof(lsm));
cd80958d 1813 lsm.cmd_type = LTTNG_LIST_CHANNELS;
cac3069d 1814 lttng_ctl_copy_string(lsm.session.name, handle->session_name,
cd80958d 1815 sizeof(lsm.session.name));
9f19cc17 1816
cac3069d 1817 lttng_ctl_copy_lttng_domain(&lsm.domain, &handle->domain);
9f19cc17 1818
cac3069d 1819 ret = lttng_ctl_ask_sessiond(&lsm, (void**) channels);
9f19cc17 1820 if (ret < 0) {
53e367f9
JG
1821 goto end;
1822 }
1823
1824 if (ret % channel_size) {
1825 ret = -LTTNG_ERR_UNK;
1826 free(*channels);
1827 *channels = NULL;
1828 goto end;
9f19cc17 1829 }
53e367f9 1830 channel_count = (size_t) ret / channel_size;
9f19cc17 1831
53e367f9
JG
1832 /* Set extended info pointers */
1833 extended_at = ((void *) *channels) +
1834 channel_count * sizeof(struct lttng_channel);
1835 for (i = 0; i < channel_count; i++) {
1836 struct lttng_channel *chan = &(*channels)[i];
1837
1838 chan->attr.extended.ptr = extended_at;
cf0bcb51 1839 extended_at += sizeof(struct lttng_channel_extended);
53e367f9
JG
1840 }
1841
1842 ret = (int) channel_count;
1843end:
1844 return ret;
9f19cc17
DG
1845}
1846
1847/*
9ae110e2
JG
1848 * Ask the session daemon for all available events of a session channel.
1849 * Sets the contents of the events array.
1850 * Returns the number of lttng_event entries in events;
1851 * on error, returns a negative value.
9f19cc17 1852 */
cd80958d
DG
1853int lttng_list_events(struct lttng_handle *handle,
1854 const char *channel_name, struct lttng_event **events)
9f19cc17
DG
1855{
1856 int ret;
cd80958d 1857 struct lttcomm_session_msg lsm;
b4e3ceb9
PP
1858 struct lttcomm_event_command_header *cmd_header = NULL;
1859 size_t cmd_header_len;
1860 uint32_t nb_events, i;
1861 void *extended_at;
9f19cc17 1862
9d697d3d
DG
1863 /* Safety check. An handle and channel name are mandatory */
1864 if (handle == NULL || channel_name == NULL) {
2f70b271 1865 return -LTTNG_ERR_INVALID;
cd80958d
DG
1866 }
1867
53efb85a 1868 memset(&lsm, 0, sizeof(lsm));
cd80958d 1869 lsm.cmd_type = LTTNG_LIST_EVENTS;
cac3069d 1870 lttng_ctl_copy_string(lsm.session.name, handle->session_name,
cd80958d 1871 sizeof(lsm.session.name));
cac3069d 1872 lttng_ctl_copy_string(lsm.u.list.channel_name, channel_name,
cd80958d 1873 sizeof(lsm.u.list.channel_name));
cac3069d 1874 lttng_ctl_copy_lttng_domain(&lsm.domain, &handle->domain);
9f19cc17 1875
b4e3ceb9
PP
1876 ret = lttng_ctl_ask_sessiond_varlen(&lsm, NULL, 0, (void **) events,
1877 (void **) &cmd_header, &cmd_header_len);
9f19cc17 1878 if (ret < 0) {
b4e3ceb9 1879 goto error;
9f19cc17
DG
1880 }
1881
b4e3ceb9
PP
1882 /* Set number of events and free command header */
1883 nb_events = cmd_header->nb_events;
1884 if (nb_events > INT_MAX) {
1885 ret = -EOVERFLOW;
1886 goto error;
1887 }
1888 ret = (int) nb_events;
1889 free(cmd_header);
1890 cmd_header = NULL;
1891
1892 /* Set extended info pointers */
1893 extended_at = ((void*) (*events)) +
1894 nb_events * sizeof(struct lttng_event);
1895
1896 for (i = 0; i < nb_events; i++) {
1897 struct lttcomm_event_extended_header *ext_header;
1898 struct lttng_event *event = &(*events)[i];
1899
1900 event->extended.ptr = extended_at;
1901 ext_header =
1902 (struct lttcomm_event_extended_header *) extended_at;
1903 extended_at += sizeof(*ext_header);
1904 extended_at += ext_header->filter_len;
795d57ce
PP
1905 extended_at +=
1906 ext_header->nb_exclusions * LTTNG_SYMBOL_NAME_LEN;
b4e3ceb9
PP
1907 }
1908
1909 return ret;
1910error:
1911 free(cmd_header);
1912 free(*events);
1913 return ret;
9f19cc17
DG
1914}
1915
134e72ed
JG
1916int lttng_event_get_filter_expression(struct lttng_event *event,
1917 const char **filter_expression)
d31d3e8c
PP
1918{
1919 int ret = 0;
1920 struct lttcomm_event_extended_header *ext_header;
1921
134e72ed 1922 if (!event || !filter_expression) {
d31d3e8c
PP
1923 ret = -LTTNG_ERR_INVALID;
1924 goto end;
1925 }
1926
1927 ext_header = event->extended.ptr;
1928
1929 if (!ext_header) {
1930 /*
1931 * This can happen since the lttng_event structure is
1932 * used for other tasks where this pointer is never set.
1933 */
134e72ed 1934 *filter_expression = NULL;
d31d3e8c
PP
1935 goto end;
1936 }
1937
1938 if (ext_header->filter_len) {
134e72ed
JG
1939 *filter_expression = ((const char *) (ext_header)) +
1940 sizeof(*ext_header);
d31d3e8c 1941 } else {
134e72ed 1942 *filter_expression = NULL;
d31d3e8c
PP
1943 }
1944
1945end:
1946 return ret;
1947}
b4e3ceb9 1948
f086e50e
PP
1949int lttng_event_get_exclusion_name_count(struct lttng_event *event)
1950{
1951 int ret;
1952 struct lttcomm_event_extended_header *ext_header;
1953
1954 if (!event) {
1955 ret = -LTTNG_ERR_INVALID;
1956 goto end;
1957 }
1958
1959 ext_header = event->extended.ptr;
1960 if (!ext_header) {
1961 /*
1962 * This can happen since the lttng_event structure is
1963 * used for other tasks where this pointer is never set.
1964 */
1965 ret = 0;
1966 goto end;
1967 }
1968
1969 if (ext_header->nb_exclusions > INT_MAX) {
1970 ret = -LTTNG_ERR_OVERFLOW;
1971 goto end;
1972 }
1973 ret = (int) ext_header->nb_exclusions;
1974end:
1975 return ret;
1976}
1977
1978int lttng_event_get_exclusion_name(struct lttng_event *event,
1979 size_t index, const char **exclusion_name)
1980{
1981 int ret = 0;
1982 struct lttcomm_event_extended_header *ext_header;
1983 void *at;
1984
1985 if (!event || !exclusion_name) {
1986 ret = -LTTNG_ERR_INVALID;
1987 goto end;
1988 }
1989
1990 ext_header = event->extended.ptr;
1991 if (!ext_header) {
1992 ret = -LTTNG_ERR_INVALID;
1993 goto end;
1994 }
1995
1996 if (index >= ext_header->nb_exclusions) {
1997 ret = -LTTNG_ERR_INVALID;
1998 goto end;
1999 }
2000
2001 at = (void *) ext_header + sizeof(*ext_header);
2002 at += ext_header->filter_len;
2003 at += index * LTTNG_SYMBOL_NAME_LEN;
2004 *exclusion_name = at;
2005
2006end:
2007 return ret;
2008}
2009
fac6795d 2010/*
1c8d13c8
TD
2011 * Sets the tracing_group variable with name.
2012 * This function allocates memory pointed to by tracing_group.
2013 * On success, returns 0, on error, returns -1 (null name) or -ENOMEM.
fac6795d
DG
2014 */
2015int lttng_set_tracing_group(const char *name)
2016{
9d697d3d 2017 if (name == NULL) {
2f70b271 2018 return -LTTNG_ERR_INVALID;
9d697d3d
DG
2019 }
2020
fac6795d 2021 if (asprintf(&tracing_group, "%s", name) < 0) {
2f70b271 2022 return -LTTNG_ERR_FATAL;
fac6795d
DG
2023 }
2024
2025 return 0;
2026}
2027
cd80958d 2028int lttng_calibrate(struct lttng_handle *handle,
d0254c7c
MD
2029 struct lttng_calibrate *calibrate)
2030{
b812e5ca
PP
2031 /*
2032 * This command was removed in LTTng 2.9.
2033 */
2034 return -LTTNG_ERR_UND;
d0254c7c
MD
2035}
2036
5edd7e09
DG
2037/*
2038 * Set default channel attributes.
441c16a7 2039 * If either or both of the arguments are null, attr content is zeroe'd.
5edd7e09
DG
2040 */
2041void lttng_channel_set_default_attr(struct lttng_domain *domain,
2042 struct lttng_channel_attr *attr)
2043{
294851b0 2044 struct lttng_channel_extended *extended;
cf0bcb51 2045
5edd7e09
DG
2046 /* Safety check */
2047 if (attr == NULL || domain == NULL) {
2048 return;
2049 }
2050
294851b0 2051 extended = (struct lttng_channel_extended *) attr->extended.ptr;
eacaa7a6
DS
2052 memset(attr, 0, sizeof(struct lttng_channel_attr));
2053
0a9c6494
DG
2054 /* Same for all domains. */
2055 attr->overwrite = DEFAULT_CHANNEL_OVERWRITE;
2056 attr->tracefile_size = DEFAULT_CHANNEL_TRACEFILE_SIZE;
2057 attr->tracefile_count = DEFAULT_CHANNEL_TRACEFILE_COUNT;
2058
5edd7e09
DG
2059 switch (domain->type) {
2060 case LTTNG_DOMAIN_KERNEL:
9ae110e2
JG
2061 attr->switch_timer_interval =
2062 DEFAULT_KERNEL_CHANNEL_SWITCH_TIMER;
d92ff3ef 2063 attr->read_timer_interval = DEFAULT_KERNEL_CHANNEL_READ_TIMER;
3e230f92 2064 attr->subbuf_size = default_get_kernel_channel_subbuf_size();
5edd7e09
DG
2065 attr->num_subbuf = DEFAULT_KERNEL_CHANNEL_SUBBUF_NUM;
2066 attr->output = DEFAULT_KERNEL_CHANNEL_OUTPUT;
cf0bcb51
JG
2067 if (extended) {
2068 extended->monitor_timer_interval =
2069 DEFAULT_KERNEL_CHANNEL_MONITOR_TIMER;
491d1539
MD
2070 extended->blocking_timeout =
2071 DEFAULT_KERNEL_CHANNEL_BLOCKING_TIMEOUT;
cf0bcb51 2072 }
5edd7e09
DG
2073 break;
2074 case LTTNG_DOMAIN_UST:
0a9c6494
DG
2075 switch (domain->buf_type) {
2076 case LTTNG_BUFFER_PER_UID:
2077 attr->subbuf_size = default_get_ust_uid_channel_subbuf_size();
2078 attr->num_subbuf = DEFAULT_UST_UID_CHANNEL_SUBBUF_NUM;
2079 attr->output = DEFAULT_UST_UID_CHANNEL_OUTPUT;
9ae110e2
JG
2080 attr->switch_timer_interval =
2081 DEFAULT_UST_UID_CHANNEL_SWITCH_TIMER;
2082 attr->read_timer_interval =
2083 DEFAULT_UST_UID_CHANNEL_READ_TIMER;
cf0bcb51
JG
2084 if (extended) {
2085 extended->monitor_timer_interval =
2086 DEFAULT_UST_UID_CHANNEL_MONITOR_TIMER;
491d1539
MD
2087 extended->blocking_timeout =
2088 DEFAULT_UST_UID_CHANNEL_BLOCKING_TIMEOUT;
cf0bcb51 2089 }
0a9c6494
DG
2090 break;
2091 case LTTNG_BUFFER_PER_PID:
2092 default:
2093 attr->subbuf_size = default_get_ust_pid_channel_subbuf_size();
2094 attr->num_subbuf = DEFAULT_UST_PID_CHANNEL_SUBBUF_NUM;
2095 attr->output = DEFAULT_UST_PID_CHANNEL_OUTPUT;
9ae110e2
JG
2096 attr->switch_timer_interval =
2097 DEFAULT_UST_PID_CHANNEL_SWITCH_TIMER;
2098 attr->read_timer_interval =
2099 DEFAULT_UST_PID_CHANNEL_READ_TIMER;
cf0bcb51
JG
2100 if (extended) {
2101 extended->monitor_timer_interval =
2102 DEFAULT_UST_PID_CHANNEL_MONITOR_TIMER;
491d1539
MD
2103 extended->blocking_timeout =
2104 DEFAULT_UST_PID_CHANNEL_BLOCKING_TIMEOUT;
cf0bcb51 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
491d1539
MD
2206int lttng_channel_get_blocking_timeout(struct lttng_channel *chan,
2207 int64_t *blocking_timeout)
2208{
2209 int ret = 0;
2210
2211 if (!chan || !blocking_timeout) {
2212 ret = -LTTNG_ERR_INVALID;
2213 goto end;
2214 }
2215
2216 if (!chan->attr.extended.ptr) {
2217 ret = -LTTNG_ERR_INVALID;
2218 goto end;
2219 }
2220
2221 *blocking_timeout = ((struct lttng_channel_extended *)
2222 chan->attr.extended.ptr)->blocking_timeout;
2223end:
2224 return ret;
2225}
2226
2227int lttng_channel_set_blocking_timeout(struct lttng_channel *chan,
2228 int64_t blocking_timeout)
2229{
2230 int ret = 0;
2231 int64_t msec_timeout;
2232
2233 if (!chan || !chan->attr.extended.ptr) {
2234 ret = -LTTNG_ERR_INVALID;
2235 goto end;
2236 }
2237
2238 if (blocking_timeout < 0 && blocking_timeout != -1) {
2239 ret = -LTTNG_ERR_INVALID;
2240 goto end;
2241 }
2242
2243 /*
2244 * LTTng-ust's use of poll() to implement this timeout mechanism forces
2245 * us to accept a narrower range of values (msecs expressed as a signed
2246 * 32-bit integer).
2247 */
2248 msec_timeout = blocking_timeout / 1000;
2249 if (msec_timeout != (int32_t) msec_timeout) {
2250 ret = -LTTNG_ERR_INVALID;
2251 goto end;
2252 }
2253
2254 ((struct lttng_channel_extended *)
2255 chan->attr.extended.ptr)->blocking_timeout =
2256 blocking_timeout;
2257end:
2258 return ret;
2259}
2260
fac6795d 2261/*
2269e89e 2262 * Check if session daemon is alive.
fac6795d 2263 *
2269e89e 2264 * Return 1 if alive or 0 if not.
1c8d13c8 2265 * On error returns a negative value.
fac6795d 2266 */
947308c4 2267int lttng_session_daemon_alive(void)
fac6795d
DG
2268{
2269 int ret;
2270
2271 ret = set_session_daemon_path();
2272 if (ret < 0) {
9ae110e2 2273 /* Error. */
fac6795d
DG
2274 return ret;
2275 }
2276
9d035200 2277 if (*sessiond_sock_path == '\0') {
2f70b271 2278 /*
9ae110e2
JG
2279 * No socket path set. Weird error which means the constructor
2280 * was not called.
2f70b271
DG
2281 */
2282 assert(0);
fac6795d
DG
2283 }
2284
2269e89e 2285 ret = try_connect_sessiond(sessiond_sock_path);
7d8234d9 2286 if (ret < 0) {
9ae110e2 2287 /* Not alive. */
7d8234d9
MD
2288 return 0;
2289 }
7d8234d9 2290
9ae110e2 2291 /* Is alive. */
947308c4 2292 return 1;
fac6795d
DG
2293}
2294
00e2e675 2295/*
a4b92340 2296 * Set URL for a consumer for a session and domain.
00e2e675
DG
2297 *
2298 * Return 0 on success, else a negative value.
2299 */
a4b92340
DG
2300int lttng_set_consumer_url(struct lttng_handle *handle,
2301 const char *control_url, const char *data_url)
00e2e675 2302{
3dd05a85 2303 int ret;
a4b92340 2304 ssize_t size;
00e2e675 2305 struct lttcomm_session_msg lsm;
a4b92340 2306 struct lttng_uri *uris = NULL;
00e2e675 2307
a4b92340 2308 if (handle == NULL || (control_url == NULL && data_url == NULL)) {
2f70b271 2309 return -LTTNG_ERR_INVALID;
00e2e675
DG
2310 }
2311
a4b92340
DG
2312 memset(&lsm, 0, sizeof(lsm));
2313
00e2e675
DG
2314 lsm.cmd_type = LTTNG_SET_CONSUMER_URI;
2315
cac3069d 2316 lttng_ctl_copy_string(lsm.session.name, handle->session_name,
00e2e675 2317 sizeof(lsm.session.name));
cac3069d 2318 lttng_ctl_copy_lttng_domain(&lsm.domain, &handle->domain);
00e2e675 2319
bc894455 2320 size = uri_parse_str_urls(control_url, data_url, &uris);
a4b92340 2321 if (size < 0) {
2f70b271 2322 return -LTTNG_ERR_INVALID;
a4b92340
DG
2323 }
2324
2325 lsm.u.uri.size = size;
00e2e675 2326
795a978d 2327 ret = lttng_ctl_ask_sessiond_varlen_no_cmd_header(&lsm, uris,
cac3069d 2328 sizeof(struct lttng_uri) * size, NULL);
3dd05a85
DG
2329
2330 free(uris);
2331 return ret;
00e2e675
DG
2332}
2333
2334/*
9c6bda17 2335 * [OBSOLETE]
00e2e675
DG
2336 */
2337int lttng_enable_consumer(struct lttng_handle *handle)
2338{
785d2d0d 2339 return -ENOSYS;
00e2e675
DG
2340}
2341
2342/*
9c6bda17 2343 * [OBSOLETE]
00e2e675
DG
2344 */
2345int lttng_disable_consumer(struct lttng_handle *handle)
2346{
785d2d0d 2347 return -ENOSYS;
00e2e675
DG
2348}
2349
07424f16
DG
2350/*
2351 * This is an extension of create session that is ONLY and SHOULD only be used
2352 * by the lttng command line program. It exists to avoid using URI parsing in
2353 * the lttng client.
2354 *
2355 * We need the date and time for the trace path subdirectory for the case where
2356 * the user does NOT define one using either -o or -U. Using the normal
2357 * lttng_create_session API call, we have no clue on the session daemon side if
2358 * the URL was generated automatically by the client or define by the user.
2359 *
2360 * So this function "wrapper" is hidden from the public API, takes the datetime
2361 * string and appends it if necessary to the URI subdirectory before sending it
2362 * to the session daemon.
2363 *
2364 * With this extra function, the lttng_create_session call behavior is not
2365 * changed and the timestamp is appended to the URI on the session daemon side
2366 * if necessary.
2367 */
2368int _lttng_create_session_ext(const char *name, const char *url,
2369 const char *datetime)
2370{
3dd05a85 2371 int ret;
07424f16
DG
2372 ssize_t size;
2373 struct lttcomm_session_msg lsm;
2374 struct lttng_uri *uris = NULL;
2375
2bba9e53 2376 if (name == NULL || datetime == NULL) {
2f70b271 2377 return -LTTNG_ERR_INVALID;
07424f16
DG
2378 }
2379
2380 memset(&lsm, 0, sizeof(lsm));
2381
2382 lsm.cmd_type = LTTNG_CREATE_SESSION;
cac3069d 2383 lttng_ctl_copy_string(lsm.session.name, name, sizeof(lsm.session.name));
07424f16 2384
9ae110e2 2385 /* There should never be a data URL. */
bc894455 2386 size = uri_parse_str_urls(url, NULL, &uris);
07424f16 2387 if (size < 0) {
3dd05a85
DG
2388 ret = -LTTNG_ERR_INVALID;
2389 goto error;
07424f16
DG
2390 }
2391
2392 lsm.u.uri.size = size;
2393
4b35a6b3 2394 if (size > 0 && uris[0].dtype != LTTNG_DST_PATH && strlen(uris[0].subdir) == 0) {
da4aa2b8
DG
2395 /* Don't append datetime if the name was automatically created. */
2396 if (strncmp(name, DEFAULT_SESSION_NAME "-",
2397 strlen(DEFAULT_SESSION_NAME) + 1)) {
2398 ret = snprintf(uris[0].subdir, sizeof(uris[0].subdir), "%s-%s",
2399 name, datetime);
2400 } else {
2401 ret = snprintf(uris[0].subdir, sizeof(uris[0].subdir), "%s", name);
2402 }
07424f16
DG
2403 if (ret < 0) {
2404 PERROR("snprintf uri subdir");
3dd05a85
DG
2405 ret = -LTTNG_ERR_FATAL;
2406 goto error;
07424f16
DG
2407 }
2408 }
2409
795a978d 2410 ret = lttng_ctl_ask_sessiond_varlen_no_cmd_header(&lsm, uris,
cac3069d 2411 sizeof(struct lttng_uri) * size, NULL);
3dd05a85
DG
2412
2413error:
2414 free(uris);
2415 return ret;
07424f16
DG
2416}
2417
806e2684
DG
2418/*
2419 * For a given session name, this call checks if the data is ready to be read
2420 * or is still being extracted by the consumer(s) hence not ready to be used by
2421 * any readers.
2422 */
6d805429 2423int lttng_data_pending(const char *session_name)
806e2684
DG
2424{
2425 int ret;
2426 struct lttcomm_session_msg lsm;
f6151c55 2427 uint8_t *pending = NULL;
806e2684
DG
2428
2429 if (session_name == NULL) {
2430 return -LTTNG_ERR_INVALID;
2431 }
2432
53efb85a 2433 memset(&lsm, 0, sizeof(lsm));
6d805429 2434 lsm.cmd_type = LTTNG_DATA_PENDING;
806e2684 2435
cac3069d
DG
2436 lttng_ctl_copy_string(lsm.session.name, session_name,
2437 sizeof(lsm.session.name));
806e2684 2438
f6151c55
JG
2439 ret = lttng_ctl_ask_sessiond(&lsm, (void **) &pending);
2440 if (ret < 0) {
2441 goto end;
2442 } else if (ret != 1) {
2443 /* Unexpected payload size */
2444 ret = -LTTNG_ERR_INVALID;
2445 goto end;
806e2684
DG
2446 }
2447
f6151c55
JG
2448 ret = (int) *pending;
2449end:
2450 free(pending);
806e2684
DG
2451 return ret;
2452}
2453
27babd3a
DG
2454/*
2455 * Create a session exclusively used for snapshot.
2456 *
2457 * Returns LTTNG_OK on success or a negative error code.
2458 */
2459int lttng_create_session_snapshot(const char *name, const char *snapshot_url)
2460{
2461 int ret;
2462 ssize_t size;
2463 struct lttcomm_session_msg lsm;
2464 struct lttng_uri *uris = NULL;
2465
2466 if (name == NULL) {
2467 return -LTTNG_ERR_INVALID;
2468 }
2469
2470 memset(&lsm, 0, sizeof(lsm));
2471
2472 lsm.cmd_type = LTTNG_CREATE_SESSION_SNAPSHOT;
2473 lttng_ctl_copy_string(lsm.session.name, name, sizeof(lsm.session.name));
2474
2475 size = uri_parse_str_urls(snapshot_url, NULL, &uris);
2476 if (size < 0) {
2477 return -LTTNG_ERR_INVALID;
2478 }
2479
2480 lsm.u.uri.size = size;
2481
10d65351
JD
2482 /*
2483 * If the user does not specify a custom subdir, use the session name.
2484 */
2485 if (size > 0 && uris[0].dtype != LTTNG_DST_PATH && strlen(uris[0].subdir) == 0) {
2486 ret = snprintf(uris[0].subdir, sizeof(uris[0].subdir), "%s", name);
2487 if (ret < 0) {
2488 PERROR("snprintf uri subdir");
2489 ret = -LTTNG_ERR_FATAL;
2490 goto error;
2491 }
2492 }
2493
795a978d 2494 ret = lttng_ctl_ask_sessiond_varlen_no_cmd_header(&lsm, uris,
27babd3a
DG
2495 sizeof(struct lttng_uri) * size, NULL);
2496
10d65351 2497error:
27babd3a
DG
2498 free(uris);
2499 return ret;
2500}
2501
ecc48a90
JD
2502/*
2503 * Create a session exclusively used for live.
2504 *
2505 * Returns LTTNG_OK on success or a negative error code.
2506 */
2507int lttng_create_session_live(const char *name, const char *url,
2508 unsigned int timer_interval)
2509{
2510 int ret;
2511 ssize_t size;
2512 struct lttcomm_session_msg lsm;
2513 struct lttng_uri *uris = NULL;
2514
92805ee4 2515 if (name == NULL || timer_interval == 0) {
ecc48a90
JD
2516 return -LTTNG_ERR_INVALID;
2517 }
2518
2519 memset(&lsm, 0, sizeof(lsm));
2520
2521 lsm.cmd_type = LTTNG_CREATE_SESSION_LIVE;
2522 lttng_ctl_copy_string(lsm.session.name, name, sizeof(lsm.session.name));
2523
1a241656
DG
2524 if (url) {
2525 size = uri_parse_str_urls(url, NULL, &uris);
2526 if (size <= 0) {
2527 ret = -LTTNG_ERR_INVALID;
2528 goto end;
2529 }
ecc48a90 2530
1a241656
DG
2531 /* file:// is not accepted for live session. */
2532 if (uris[0].dtype == LTTNG_DST_PATH) {
2533 ret = -LTTNG_ERR_INVALID;
2534 goto end;
2535 }
2536 } else {
2537 size = 0;
ecc48a90
JD
2538 }
2539
2540 lsm.u.session_live.nb_uri = size;
2541 lsm.u.session_live.timer_interval = timer_interval;
2542
795a978d 2543 ret = lttng_ctl_ask_sessiond_varlen_no_cmd_header(&lsm, uris,
ecc48a90
JD
2544 sizeof(struct lttng_uri) * size, NULL);
2545
2546end:
2547 free(uris);
2548 return ret;
2549}
2550
a5dfbb9d
MD
2551/*
2552 * List PIDs in the tracker.
2553 *
1b18ce93
JG
2554 * enabled is set to whether the PID tracker is enabled.
2555 * pids is set to an allocated array of PIDs currently tracked. On
2556 * success, pids must be freed by the caller.
2557 * nr_pids is set to the number of entries contained by the pids array.
a5dfbb9d
MD
2558 *
2559 * Returns 0 on success, else a negative LTTng error code.
2560 */
2561int lttng_list_tracker_pids(struct lttng_handle *handle,
2562 int *_enabled, int32_t **_pids, size_t *_nr_pids)
2563{
ebbf5ab7
JR
2564 int ret;
2565 int enabled = 1;
a5dfbb9d
MD
2566 struct lttcomm_session_msg lsm;
2567 size_t nr_pids;
2568 int32_t *pids;
2569
2570 if (handle == NULL) {
2571 return -LTTNG_ERR_INVALID;
2572 }
2573
2574 memset(&lsm, 0, sizeof(lsm));
2575 lsm.cmd_type = LTTNG_LIST_TRACKER_PIDS;
2576 lttng_ctl_copy_string(lsm.session.name, handle->session_name,
2577 sizeof(lsm.session.name));
2578 lttng_ctl_copy_lttng_domain(&lsm.domain, &handle->domain);
2579
2580 ret = lttng_ctl_ask_sessiond(&lsm, (void **) &pids);
2581 if (ret < 0) {
2582 return ret;
2583 }
2584 nr_pids = ret / sizeof(int32_t);
2585 if (nr_pids == 1 && pids[0] == -1) {
2586 free(pids);
2587 pids = NULL;
2588 enabled = 0;
2589 nr_pids = 0;
2590 }
2591 *_enabled = enabled;
2592 *_pids = pids;
2593 *_nr_pids = nr_pids;
2594 return 0;
2595}
2596
93ec662e
JD
2597/*
2598 * Regenerate the metadata for a session.
2599 * Return 0 on success, a negative error code on error.
2600 */
eded6438 2601int lttng_regenerate_metadata(const char *session_name)
93ec662e
JD
2602{
2603 int ret;
2604 struct lttcomm_session_msg lsm;
2605
2606 if (!session_name) {
2607 ret = -LTTNG_ERR_INVALID;
2608 goto end;
2609 }
2610
2611 memset(&lsm, 0, sizeof(lsm));
eded6438 2612 lsm.cmd_type = LTTNG_REGENERATE_METADATA;
93ec662e
JD
2613
2614 lttng_ctl_copy_string(lsm.session.name, session_name,
2615 sizeof(lsm.session.name));
2616
2617 ret = lttng_ctl_ask_sessiond(&lsm, NULL);
2618 if (ret < 0) {
2619 goto end;
2620 }
2621
2622 ret = 0;
2623end:
2624 return ret;
2625}
2626
eded6438
JD
2627/*
2628 * Deprecated, replaced by lttng_regenerate_metadata.
2629 */
2630int lttng_metadata_regenerate(const char *session_name)
2631{
2632 return lttng_regenerate_metadata(session_name);
2633}
2634
c2561365
JD
2635/*
2636 * Regenerate the statedump of a session.
2637 * Return 0 on success, a negative error code on error.
2638 */
2639int lttng_regenerate_statedump(const char *session_name)
2640{
2641 int ret;
2642 struct lttcomm_session_msg lsm;
2643
2644 if (!session_name) {
2645 ret = -LTTNG_ERR_INVALID;
2646 goto end;
2647 }
2648
2649 memset(&lsm, 0, sizeof(lsm));
2650 lsm.cmd_type = LTTNG_REGENERATE_STATEDUMP;
2651
2652 lttng_ctl_copy_string(lsm.session.name, session_name,
2653 sizeof(lsm.session.name));
2654
2655 ret = lttng_ctl_ask_sessiond(&lsm, NULL);
2656 if (ret < 0) {
2657 goto end;
2658 }
2659
2660 ret = 0;
2661end:
2662 return ret;
2663}
2664
a58c490f
JG
2665int lttng_register_trigger(struct lttng_trigger *trigger)
2666{
2667 int ret;
2668 struct lttcomm_session_msg lsm;
2669 char *trigger_buf = NULL;
2670 ssize_t trigger_size;
2671
2672 if (!trigger) {
2673 ret = -LTTNG_ERR_INVALID;
2674 goto end;
2675 }
2676
2677 if (!lttng_trigger_validate(trigger)) {
eac4828d 2678 ret = -LTTNG_ERR_INVALID_TRIGGER;
a58c490f
JG
2679 goto end;
2680 }
2681
2682 trigger_size = lttng_trigger_serialize(trigger, NULL);
2683 if (trigger_size < 0) {
2684 ret = -LTTNG_ERR_UNK;
2685 goto end;
2686 }
2687
2688 trigger_buf = zmalloc(trigger_size);
2689 if (!trigger_buf) {
2690 ret = -LTTNG_ERR_NOMEM;
2691 goto end;
2692 }
2693
2694 memset(&lsm, 0, sizeof(lsm));
2695 lsm.cmd_type = LTTNG_REGISTER_TRIGGER;
2696 if (lttng_trigger_serialize(trigger, trigger_buf) < 0) {
2697 ret = -LTTNG_ERR_UNK;
2698 goto end;
2699 }
2700
2701 lsm.u.trigger.length = (uint32_t) trigger_size;
2702 ret = lttng_ctl_ask_sessiond_varlen_no_cmd_header(&lsm, trigger_buf,
2703 trigger_size, NULL);
2704end:
2705 free(trigger_buf);
2706 return ret;
2707}
2708
2709int lttng_unregister_trigger(struct lttng_trigger *trigger)
2710{
2711 int ret;
2712 struct lttcomm_session_msg lsm;
2713 char *trigger_buf = NULL;
2714 ssize_t trigger_size;
2715
2716 if (!trigger) {
2717 ret = -LTTNG_ERR_INVALID;
2718 goto end;
2719 }
2720
2721 if (!lttng_trigger_validate(trigger)) {
2722 ret = -LTTNG_ERR_INVALID;
2723 goto end;
2724 }
2725
2726 trigger_size = lttng_trigger_serialize(trigger, NULL);
2727 if (trigger_size < 0) {
2728 ret = -LTTNG_ERR_UNK;
2729 goto end;
2730 }
2731
2732 trigger_buf = zmalloc(trigger_size);
2733 if (!trigger_buf) {
2734 ret = -LTTNG_ERR_NOMEM;
2735 goto end;
2736 }
2737
2738 memset(&lsm, 0, sizeof(lsm));
2739 lsm.cmd_type = LTTNG_UNREGISTER_TRIGGER;
2740 if (lttng_trigger_serialize(trigger, trigger_buf) < 0) {
2741 ret = -LTTNG_ERR_UNK;
2742 goto end;
2743 }
2744
2745 lsm.u.trigger.length = (uint32_t) trigger_size;
2746 ret = lttng_ctl_ask_sessiond_varlen_no_cmd_header(&lsm, trigger_buf,
2747 trigger_size, NULL);
2748end:
2749 free(trigger_buf);
2750 return ret;
2751}
2752
d68c9a04
JD
2753int lttng_session_get_current_archive_location(const char *session_name,
2754 char **chunk_path)
2755{
2756 struct lttcomm_session_msg lsm;
2757 struct lttng_session_get_current_output_return *output_return = NULL;
2758 int ret;
2759 size_t path_len;
2760
2761 memset(&lsm, 0, sizeof(lsm));
2762 lsm.cmd_type = LTTNG_SESSION_GET_CURRENT_OUTPUT;
2763 ret = lttng_strncpy(lsm.session.name, session_name,
2764 sizeof(lsm.session.name));
2765 if (ret) {
2766 ret = -LTTNG_ERR_INVALID;
2767 goto end;
2768 }
2769
2770 ret = lttng_ctl_ask_sessiond(&lsm, (void **) &output_return);
2771 if (ret < 0) {
2772 ret = -1;
2773 goto end;
2774 }
2775
2776 path_len = lttng_strnlen(output_return->path,
2777 sizeof(output_return->path));
2778 if (path_len == 0 || path_len == sizeof(output_return->path)) {
2779 ret = -LTTNG_ERR_NO_SESSION_OUTPUT;
2780 goto end;
2781 }
2782
2783 *chunk_path = zmalloc(path_len + 1);
2784 if (!*chunk_path) {
2785 ret = -1;
2786 goto end;
2787 }
2788 memcpy(*chunk_path, output_return->path, path_len);
2789
2790 ret = 0;
2791
2792end:
2793 free(output_return);
2794 return ret;
2795}
2796
fac6795d 2797/*
9ae110e2 2798 * lib constructor.
fac6795d 2799 */
b2b89e8a 2800static void __attribute__((constructor)) init(void)
fac6795d
DG
2801{
2802 /* Set default session group */
bbccc3d2 2803 lttng_set_tracing_group(DEFAULT_TRACING_GROUP);
fac6795d 2804}
49cca668
DG
2805
2806/*
9ae110e2 2807 * lib destructor.
49cca668 2808 */
b2b89e8a 2809static void __attribute__((destructor)) lttng_ctl_exit(void)
49cca668
DG
2810{
2811 free(tracing_group);
2812}
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