Kernel ioctl to regenerate the statedump
[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>
fac6795d 39
d00c599e
DG
40#include "filter/filter-ast.h"
41#include "filter/filter-parser.h"
42#include "filter/filter-bytecode.h"
43#include "filter/memstream.h"
cac3069d 44#include "lttng-ctl-helper.h"
53a80697
MD
45
46#ifdef DEBUG
d00c599e 47static const int print_xml = 1;
53a80697
MD
48#define dbg_printf(fmt, args...) \
49 printf("[debug liblttng-ctl] " fmt, ## args)
50#else
d00c599e 51static const int print_xml = 0;
53a80697
MD
52#define dbg_printf(fmt, args...) \
53do { \
54 /* do nothing but check printf format */ \
55 if (0) \
56 printf("[debug liblttnctl] " fmt, ## args); \
57} while (0)
58#endif
59
60
fac6795d
DG
61/* Socket to session daemon for communication */
62static int sessiond_socket;
63static char sessiond_sock_path[PATH_MAX];
64
fac6795d
DG
65/* Variables */
66static char *tracing_group;
67static int connected;
68
97e19046
DG
69/* Global */
70
71/*
72 * Those two variables are used by error.h to silent or control the verbosity of
73 * error message. They are global to the library so application linking with it
74 * are able to compile correctly and also control verbosity of the library.
97e19046
DG
75 */
76int lttng_opt_quiet;
77int lttng_opt_verbose;
c7e35b03 78int lttng_opt_mi;
97e19046 79
99497cd0
MD
80/*
81 * Copy string from src to dst and enforce null terminated byte.
82 */
cac3069d
DG
83LTTNG_HIDDEN
84void lttng_ctl_copy_string(char *dst, const char *src, size_t len)
99497cd0 85{
e7d6716d 86 if (src && dst) {
99497cd0
MD
87 strncpy(dst, src, len);
88 /* Enforce the NULL terminated byte */
89 dst[len - 1] = '\0';
cd80958d
DG
90 } else if (dst) {
91 dst[0] = '\0';
99497cd0
MD
92 }
93}
94
fac6795d 95/*
cd80958d 96 * Copy domain to lttcomm_session_msg domain.
fac6795d 97 *
cd80958d
DG
98 * If domain is unknown, default domain will be the kernel.
99 */
cac3069d
DG
100LTTNG_HIDDEN
101void lttng_ctl_copy_lttng_domain(struct lttng_domain *dst,
102 struct lttng_domain *src)
cd80958d
DG
103{
104 if (src && dst) {
105 switch (src->type) {
00e2e675
DG
106 case LTTNG_DOMAIN_KERNEL:
107 case LTTNG_DOMAIN_UST:
b9dfb167 108 case LTTNG_DOMAIN_JUL:
5cdb6027 109 case LTTNG_DOMAIN_LOG4J:
0e115563 110 case LTTNG_DOMAIN_PYTHON:
00e2e675
DG
111 memcpy(dst, src, sizeof(struct lttng_domain));
112 break;
113 default:
114 memset(dst, 0, sizeof(struct lttng_domain));
00e2e675 115 break;
cd80958d
DG
116 }
117 }
118}
119
120/*
121 * Send lttcomm_session_msg to the session daemon.
fac6795d 122 *
1c8d13c8
TD
123 * On success, returns the number of bytes sent (>=0)
124 * On error, returns -1
fac6795d 125 */
cd80958d 126static int send_session_msg(struct lttcomm_session_msg *lsm)
fac6795d
DG
127{
128 int ret;
129
130 if (!connected) {
2f70b271 131 ret = -LTTNG_ERR_NO_SESSIOND;
e065084a 132 goto end;
fac6795d
DG
133 }
134
a4b92340
DG
135 DBG("LSM cmd type : %d", lsm->cmd_type);
136
be040666 137 ret = lttcomm_send_creds_unix_sock(sessiond_socket, lsm,
cd80958d 138 sizeof(struct lttcomm_session_msg));
2f70b271
DG
139 if (ret < 0) {
140 ret = -LTTNG_ERR_FATAL;
141 }
e065084a
DG
142
143end:
144 return ret;
145}
146
53a80697
MD
147/*
148 * Send var len data to the session daemon.
149 *
150 * On success, returns the number of bytes sent (>=0)
151 * On error, returns -1
152 */
c2d69327 153static int send_session_varlen(const void *data, size_t len)
53a80697
MD
154{
155 int ret;
156
157 if (!connected) {
2f70b271 158 ret = -LTTNG_ERR_NO_SESSIOND;
53a80697
MD
159 goto end;
160 }
a4b92340 161
53a80697
MD
162 if (!data || !len) {
163 ret = 0;
164 goto end;
165 }
166
167 ret = lttcomm_send_unix_sock(sessiond_socket, data, len);
2f70b271
DG
168 if (ret < 0) {
169 ret = -LTTNG_ERR_FATAL;
170 }
53a80697
MD
171
172end:
173 return ret;
174}
175
e065084a 176/*
cd80958d 177 * Receive data from the sessiond socket.
e065084a 178 *
1c8d13c8
TD
179 * On success, returns the number of bytes received (>=0)
180 * On error, returns -1 (recvmsg() error) or -ENOTCONN
e065084a 181 */
ca95a216 182static int recv_data_sessiond(void *buf, size_t len)
e065084a
DG
183{
184 int ret;
185
186 if (!connected) {
2f70b271 187 ret = -LTTNG_ERR_NO_SESSIOND;
e065084a 188 goto end;
fac6795d
DG
189 }
190
ca95a216 191 ret = lttcomm_recv_unix_sock(sessiond_socket, buf, len);
2f70b271
DG
192 if (ret < 0) {
193 ret = -LTTNG_ERR_FATAL;
194 }
fac6795d 195
e065084a 196end:
fac6795d
DG
197 return ret;
198}
199
200/*
9ae110e2 201 * Check if we are in the specified group.
65beb5ff 202 *
9ae110e2 203 * If yes return 1, else return -1.
947308c4 204 */
6c71277b
MD
205LTTNG_HIDDEN
206int lttng_check_tracing_group(void)
947308c4
DG
207{
208 struct group *grp_tracing; /* no free(). See getgrnam(3) */
209 gid_t *grp_list;
210 int grp_list_size, grp_id, i;
211 int ret = -1;
6c71277b 212 const char *grp_name = tracing_group;
947308c4
DG
213
214 /* Get GID of group 'tracing' */
215 grp_tracing = getgrnam(grp_name);
b4d8603b
MD
216 if (!grp_tracing) {
217 /* If grp_tracing is NULL, the group does not exist. */
947308c4
DG
218 goto end;
219 }
220
221 /* Get number of supplementary group IDs */
222 grp_list_size = getgroups(0, NULL);
223 if (grp_list_size < 0) {
6f04ed72 224 PERROR("getgroups");
947308c4
DG
225 goto end;
226 }
227
228 /* Alloc group list of the right size */
3f451dc0 229 grp_list = zmalloc(grp_list_size * sizeof(gid_t));
00795392 230 if (!grp_list) {
6f04ed72 231 PERROR("malloc");
00795392
MD
232 goto end;
233 }
947308c4 234 grp_id = getgroups(grp_list_size, grp_list);
1c8d13c8 235 if (grp_id < 0) {
6f04ed72 236 PERROR("getgroups");
947308c4
DG
237 goto free_list;
238 }
239
240 for (i = 0; i < grp_list_size; i++) {
241 if (grp_list[i] == grp_tracing->gr_gid) {
2269e89e 242 ret = 1;
947308c4
DG
243 break;
244 }
245 }
246
247free_list:
248 free(grp_list);
249
250end:
251 return ret;
252}
253
254/*
2269e89e
DG
255 * Try connect to session daemon with sock_path.
256 *
257 * Return 0 on success, else -1
258 */
259static int try_connect_sessiond(const char *sock_path)
260{
261 int ret;
262
263 /* If socket exist, we check if the daemon listens for connect. */
264 ret = access(sock_path, F_OK);
265 if (ret < 0) {
266 /* Not alive */
2f70b271 267 goto error;
2269e89e
DG
268 }
269
270 ret = lttcomm_connect_unix_sock(sock_path);
271 if (ret < 0) {
9ae110e2 272 /* Not alive. */
2f70b271 273 goto error;
2269e89e
DG
274 }
275
276 ret = lttcomm_close_unix_sock(ret);
277 if (ret < 0) {
6f04ed72 278 PERROR("lttcomm_close_unix_sock");
2269e89e
DG
279 }
280
281 return 0;
2f70b271
DG
282
283error:
284 return -1;
2269e89e
DG
285}
286
287/*
2f70b271
DG
288 * Set sessiond socket path by putting it in the global sessiond_sock_path
289 * variable.
290 *
291 * Returns 0 on success, negative value on failure (the sessiond socket path
292 * is somehow too long or ENOMEM).
947308c4
DG
293 */
294static int set_session_daemon_path(void)
295{
9ae110e2 296 int in_tgroup = 0; /* In tracing group. */
2269e89e
DG
297 uid_t uid;
298
299 uid = getuid();
947308c4 300
2269e89e
DG
301 if (uid != 0) {
302 /* Are we in the tracing group ? */
6c71277b 303 in_tgroup = lttng_check_tracing_group();
2269e89e
DG
304 }
305
08a9c49f 306 if ((uid == 0) || in_tgroup) {
cac3069d
DG
307 lttng_ctl_copy_string(sessiond_sock_path,
308 DEFAULT_GLOBAL_CLIENT_UNIX_SOCK, sizeof(sessiond_sock_path));
08a9c49f 309 }
2269e89e 310
08a9c49f 311 if (uid != 0) {
c617c0c6
MD
312 int ret;
313
08a9c49f 314 if (in_tgroup) {
9ae110e2 315 /* Tracing group. */
08a9c49f
TD
316 ret = try_connect_sessiond(sessiond_sock_path);
317 if (ret >= 0) {
318 goto end;
2269e89e 319 }
08a9c49f 320 /* Global session daemon not available... */
2269e89e 321 }
08a9c49f
TD
322 /* ...or not in tracing group (and not root), default */
323
324 /*
9ae110e2
JG
325 * With GNU C < 2.1, snprintf returns -1 if the target buffer
326 * is too small;
327 * With GNU C >= 2.1, snprintf returns the required size
328 * (excluding closing null)
08a9c49f
TD
329 */
330 ret = snprintf(sessiond_sock_path, sizeof(sessiond_sock_path),
feb0f3e5 331 DEFAULT_HOME_CLIENT_UNIX_SOCK, utils_get_home_dir());
08a9c49f 332 if ((ret < 0) || (ret >= sizeof(sessiond_sock_path))) {
2f70b271 333 goto error;
947308c4 334 }
947308c4 335 }
08a9c49f 336end:
947308c4 337 return 0;
2f70b271
DG
338
339error:
340 return -1;
947308c4
DG
341}
342
65beb5ff 343/*
9ae110e2 344 * Connect to the LTTng session daemon.
65beb5ff 345 *
9ae110e2 346 * On success, return 0. On error, return -1.
65beb5ff
DG
347 */
348static int connect_sessiond(void)
349{
350 int ret;
351
da3c9ec1
DG
352 /* Don't try to connect if already connected. */
353 if (connected) {
354 return 0;
355 }
356
65beb5ff
DG
357 ret = set_session_daemon_path();
358 if (ret < 0) {
2f70b271 359 goto error;
65beb5ff
DG
360 }
361
9ae110e2 362 /* Connect to the sesssion daemon. */
65beb5ff
DG
363 ret = lttcomm_connect_unix_sock(sessiond_sock_path);
364 if (ret < 0) {
2f70b271 365 goto error;
65beb5ff
DG
366 }
367
368 sessiond_socket = ret;
369 connected = 1;
370
371 return 0;
2f70b271
DG
372
373error:
374 return -1;
65beb5ff
DG
375}
376
377/*
1c8d13c8 378 * Clean disconnect from the session daemon.
9ae110e2 379 *
1c8d13c8 380 * On success, return 0. On error, return -1.
65beb5ff
DG
381 */
382static int disconnect_sessiond(void)
383{
384 int ret = 0;
385
386 if (connected) {
387 ret = lttcomm_close_unix_sock(sessiond_socket);
388 sessiond_socket = 0;
389 connected = 0;
390 }
391
392 return ret;
393}
394
795a978d
PP
395static int recv_sessiond_optional_data(size_t len, void **user_buf,
396 size_t *user_len)
397{
398 int ret = 0;
399 void *buf = NULL;
400
401 if (len) {
402 if (!user_len) {
403 ret = -LTTNG_ERR_INVALID;
404 goto end;
405 }
406
407 buf = zmalloc(len);
408 if (!buf) {
409 ret = -ENOMEM;
410 goto end;
411 }
412
413 ret = recv_data_sessiond(buf, len);
414 if (ret < 0) {
415 goto end;
416 }
417
418 if (!user_buf) {
419 ret = -LTTNG_ERR_INVALID;
420 goto end;
421 }
422
423 /* Move ownership of command header buffer to user. */
424 *user_buf = buf;
425 buf = NULL;
426 *user_len = len;
427 } else {
428 /* No command header. */
429 if (user_len) {
430 *user_len = 0;
431 }
432
433 if (user_buf) {
434 *user_buf = NULL;
435 }
436 }
437
438end:
439 free(buf);
440 return ret;
441}
442
35a6fdb7 443/*
cd80958d 444 * Ask the session daemon a specific command and put the data into buf.
53a80697 445 * Takes extra var. len. data as input to send to the session daemon.
65beb5ff 446 *
af87c45a 447 * Return size of data (only payload, not header) or a negative error code.
65beb5ff 448 */
cac3069d
DG
449LTTNG_HIDDEN
450int lttng_ctl_ask_sessiond_varlen(struct lttcomm_session_msg *lsm,
795a978d
PP
451 const void *vardata, size_t vardata_len,
452 void **user_payload_buf, void **user_cmd_header_buf,
453 size_t *user_cmd_header_len)
65beb5ff
DG
454{
455 int ret;
795a978d 456 size_t payload_len;
cd80958d 457 struct lttcomm_lttng_msg llm;
65beb5ff
DG
458
459 ret = connect_sessiond();
460 if (ret < 0) {
2f70b271 461 ret = -LTTNG_ERR_NO_SESSIOND;
65beb5ff
DG
462 goto end;
463 }
464
65beb5ff 465 /* Send command to session daemon */
cd80958d 466 ret = send_session_msg(lsm);
65beb5ff 467 if (ret < 0) {
2f70b271 468 /* Ret value is a valid lttng error code. */
65beb5ff
DG
469 goto end;
470 }
53a80697 471 /* Send var len data */
795a978d 472 ret = send_session_varlen(vardata, vardata_len);
53a80697 473 if (ret < 0) {
2f70b271 474 /* Ret value is a valid lttng error code. */
53a80697
MD
475 goto end;
476 }
65beb5ff
DG
477
478 /* Get header from data transmission */
479 ret = recv_data_sessiond(&llm, sizeof(llm));
480 if (ret < 0) {
2f70b271 481 /* Ret value is a valid lttng error code. */
65beb5ff
DG
482 goto end;
483 }
484
485 /* Check error code if OK */
f73fabfd 486 if (llm.ret_code != LTTNG_OK) {
65beb5ff
DG
487 ret = -llm.ret_code;
488 goto end;
489 }
490
795a978d
PP
491 /* Get command header from data transmission */
492 ret = recv_sessiond_optional_data(llm.cmd_header_size,
493 user_cmd_header_buf, user_cmd_header_len);
65beb5ff 494 if (ret < 0) {
65beb5ff
DG
495 goto end;
496 }
497
795a978d
PP
498 /* Get payload from data transmission */
499 ret = recv_sessiond_optional_data(llm.data_size, user_payload_buf,
500 &payload_len);
501 if (ret < 0) {
83009e5e
DG
502 goto end;
503 }
504
795a978d 505 ret = llm.data_size;
65beb5ff
DG
506
507end:
508 disconnect_sessiond();
509 return ret;
510}
511
9f19cc17 512/*
cd80958d 513 * Create lttng handle and return pointer.
9ae110e2 514 *
1c8d13c8 515 * The returned pointer will be NULL in case of malloc() error.
9f19cc17 516 */
cd80958d
DG
517struct lttng_handle *lttng_create_handle(const char *session_name,
518 struct lttng_domain *domain)
9f19cc17 519{
2f70b271
DG
520 struct lttng_handle *handle = NULL;
521
3f451dc0 522 handle = zmalloc(sizeof(struct lttng_handle));
cd80958d 523 if (handle == NULL) {
2f70b271 524 PERROR("malloc handle");
cd80958d
DG
525 goto end;
526 }
527
528 /* Copy session name */
cac3069d 529 lttng_ctl_copy_string(handle->session_name, session_name,
cd80958d
DG
530 sizeof(handle->session_name));
531
95681498
JG
532 /* Copy lttng domain or leave initialized to 0. */
533 if (domain) {
534 lttng_ctl_copy_lttng_domain(&handle->domain, domain);
535 }
cd80958d
DG
536
537end:
538 return handle;
539}
540
541/*
542 * Destroy handle by free(3) the pointer.
543 */
544void lttng_destroy_handle(struct lttng_handle *handle)
545{
0e428499 546 free(handle);
eb354453
DG
547}
548
d9800920
DG
549/*
550 * Register an outside consumer.
9ae110e2 551 *
1c8d13c8 552 * Returns size of returned session payload data or a negative error code.
d9800920
DG
553 */
554int lttng_register_consumer(struct lttng_handle *handle,
555 const char *socket_path)
556{
557 struct lttcomm_session_msg lsm;
558
2f70b271
DG
559 if (handle == NULL || socket_path == NULL) {
560 return -LTTNG_ERR_INVALID;
561 }
562
53efb85a 563 memset(&lsm, 0, sizeof(lsm));
d9800920 564 lsm.cmd_type = LTTNG_REGISTER_CONSUMER;
cac3069d 565 lttng_ctl_copy_string(lsm.session.name, handle->session_name,
d9800920 566 sizeof(lsm.session.name));
cac3069d 567 lttng_ctl_copy_lttng_domain(&lsm.domain, &handle->domain);
d9800920 568
9ae110e2
JG
569 lttng_ctl_copy_string(lsm.u.reg.path, socket_path,
570 sizeof(lsm.u.reg.path));
d9800920 571
cac3069d 572 return lttng_ctl_ask_sessiond(&lsm, NULL);
d9800920
DG
573}
574
1df4dedd 575/*
9ae110e2
JG
576 * Start tracing for all traces of the session.
577 *
578 * Returns size of returned session payload data or a negative error code.
1df4dedd 579 */
6a4f824d 580int lttng_start_tracing(const char *session_name)
f3ed775e 581{
cd80958d
DG
582 struct lttcomm_session_msg lsm;
583
6a4f824d 584 if (session_name == NULL) {
2f70b271 585 return -LTTNG_ERR_INVALID;
cd80958d
DG
586 }
587
53efb85a 588 memset(&lsm, 0, sizeof(lsm));
cd80958d 589 lsm.cmd_type = LTTNG_START_TRACE;
6a4f824d 590
cac3069d
DG
591 lttng_ctl_copy_string(lsm.session.name, session_name,
592 sizeof(lsm.session.name));
cd80958d 593
cac3069d 594 return lttng_ctl_ask_sessiond(&lsm, NULL);
f3ed775e 595}
1df4dedd
DG
596
597/*
38ee087f 598 * Stop tracing for all traces of the session.
f3ed775e 599 */
38ee087f 600static int _lttng_stop_tracing(const char *session_name, int wait)
f3ed775e 601{
38ee087f 602 int ret, data_ret;
cd80958d
DG
603 struct lttcomm_session_msg lsm;
604
6a4f824d 605 if (session_name == NULL) {
2f70b271 606 return -LTTNG_ERR_INVALID;
6a4f824d
DG
607 }
608
53efb85a 609 memset(&lsm, 0, sizeof(lsm));
cd80958d 610 lsm.cmd_type = LTTNG_STOP_TRACE;
6a4f824d 611
cac3069d
DG
612 lttng_ctl_copy_string(lsm.session.name, session_name,
613 sizeof(lsm.session.name));
cd80958d 614
cac3069d 615 ret = lttng_ctl_ask_sessiond(&lsm, NULL);
38ee087f
DG
616 if (ret < 0 && ret != -LTTNG_ERR_TRACE_ALREADY_STOPPED) {
617 goto error;
618 }
619
620 if (!wait) {
621 goto end;
622 }
623
38ee087f
DG
624 /* Check for data availability */
625 do {
6d805429 626 data_ret = lttng_data_pending(session_name);
38ee087f
DG
627 if (data_ret < 0) {
628 /* Return the data available call error. */
629 ret = data_ret;
630 goto error;
631 }
632
633 /*
9ae110e2
JG
634 * Data sleep time before retrying (in usec). Don't sleep if the
635 * call returned value indicates availability.
38ee087f 636 */
6d805429 637 if (data_ret) {
38ee087f 638 usleep(DEFAULT_DATA_AVAILABILITY_WAIT_TIME);
38ee087f 639 }
6d805429 640 } while (data_ret != 0);
38ee087f 641
38ee087f
DG
642end:
643error:
644 return ret;
645}
646
647/*
648 * Stop tracing and wait for data availability.
649 */
650int lttng_stop_tracing(const char *session_name)
651{
652 return _lttng_stop_tracing(session_name, 1);
653}
654
655/*
656 * Stop tracing but _don't_ wait for data availability.
657 */
658int lttng_stop_tracing_no_wait(const char *session_name)
659{
660 return _lttng_stop_tracing(session_name, 0);
f3ed775e
DG
661}
662
663/*
601d5acf
DG
664 * Add context to a channel.
665 *
666 * If the given channel is NULL, add the contexts to all channels.
667 * The event_name param is ignored.
af87c45a
DG
668 *
669 * Returns the size of the returned payload data or a negative error code.
1df4dedd 670 */
cd80958d 671int lttng_add_context(struct lttng_handle *handle,
38057ed1
DG
672 struct lttng_event_context *ctx, const char *event_name,
673 const char *channel_name)
d65106b1 674{
2001793c
JG
675 int ret;
676 size_t len = 0;
677 char *buf = NULL;
cd80958d
DG
678 struct lttcomm_session_msg lsm;
679
9ae110e2 680 /* Safety check. Both are mandatory. */
9d697d3d 681 if (handle == NULL || ctx == NULL) {
2001793c
JG
682 ret = -LTTNG_ERR_INVALID;
683 goto end;
cd80958d
DG
684 }
685
441c16a7 686 memset(&lsm, 0, sizeof(lsm));
cd80958d
DG
687 lsm.cmd_type = LTTNG_ADD_CONTEXT;
688
85076754
MD
689 /* If no channel name, send empty string. */
690 if (channel_name == NULL) {
691 lttng_ctl_copy_string(lsm.u.context.channel_name, "",
692 sizeof(lsm.u.context.channel_name));
693 } else {
694 lttng_ctl_copy_string(lsm.u.context.channel_name, channel_name,
695 sizeof(lsm.u.context.channel_name));
696 }
cd80958d 697
cac3069d 698 lttng_ctl_copy_lttng_domain(&lsm.domain, &handle->domain);
cac3069d 699 lttng_ctl_copy_string(lsm.session.name, handle->session_name,
cd80958d
DG
700 sizeof(lsm.session.name));
701
2001793c
JG
702 if (ctx->ctx == LTTNG_EVENT_CONTEXT_APP_CONTEXT) {
703 size_t provider_len, ctx_len;
704 const char *provider_name = ctx->u.app_ctx.provider_name;
705 const char *ctx_name = ctx->u.app_ctx.ctx_name;
706
707 if (!provider_name || !ctx_name) {
708 ret = -LTTNG_ERR_INVALID;
709 goto end;
710 }
711
712 provider_len = strlen(provider_name);
713 if (provider_len == 0) {
714 ret = -LTTNG_ERR_INVALID;
715 goto end;
716 }
717 lsm.u.context.provider_name_len = provider_len;
718
719 ctx_len = strlen(ctx_name);
720 if (ctx_len == 0) {
721 ret = -LTTNG_ERR_INVALID;
722 goto end;
723 }
724 lsm.u.context.context_name_len = ctx_len;
725
726 len = provider_len + ctx_len;
727 buf = zmalloc(len);
728 if (!buf) {
729 ret = -LTTNG_ERR_NOMEM;
730 goto end;
731 }
732
733 memcpy(buf, provider_name, provider_len);
734 memcpy(buf + provider_len, ctx_name, ctx_len);
735 }
736 memcpy(&lsm.u.context.ctx, ctx, sizeof(struct lttng_event_context));
46f44e2a
JR
737
738 if (ctx->ctx == LTTNG_EVENT_CONTEXT_APP_CONTEXT) {
739 /*
740 * Don't leak application addresses to the sessiond.
741 * This is only necessary when ctx is for an app ctx otherwise
742 * the values inside the union (type & config) are overwritten.
743 */
744 lsm.u.context.ctx.u.app_ctx.provider_name = NULL;
745 lsm.u.context.ctx.u.app_ctx.ctx_name = NULL;
746 }
2001793c 747
795a978d 748 ret = lttng_ctl_ask_sessiond_varlen_no_cmd_header(&lsm, buf, len, NULL);
2001793c
JG
749end:
750 free(buf);
751 return ret;
d65106b1
DG
752}
753
f3ed775e 754/*
9ae110e2
JG
755 * Enable event(s) for a channel.
756 *
757 * If no event name is specified, all events are enabled.
758 * If no channel name is specified, the default 'channel0' is used.
759 *
760 * Returns size of returned session payload data or a negative error code.
f3ed775e 761 */
cd80958d 762int lttng_enable_event(struct lttng_handle *handle,
38057ed1 763 struct lttng_event *ev, const char *channel_name)
1df4dedd 764{
f8a96544
JI
765 return lttng_enable_event_with_exclusions(handle, ev, channel_name,
766 NULL, 0, NULL);
1df4dedd
DG
767}
768
53a80697 769/*
025faf73 770 * Create or enable an event with a filter expression.
178191b3 771 *
53a80697
MD
772 * Return negative error value on error.
773 * Return size of returned session payload data if OK.
774 */
025faf73 775int lttng_enable_event_with_filter(struct lttng_handle *handle,
178191b3 776 struct lttng_event *event, const char *channel_name,
53a80697
MD
777 const char *filter_expression)
778{
f8a96544
JI
779 return lttng_enable_event_with_exclusions(handle, event, channel_name,
780 filter_expression, 0, NULL);
53a80697
MD
781}
782
347c5ab5 783/*
0e115563 784 * Depending on the event, return a newly allocated agent filter expression or
347c5ab5
DG
785 * NULL if not applicable.
786 *
787 * An event with NO loglevel and the name is * will return NULL.
788 */
0e115563 789static char *set_agent_filter(const char *filter, struct lttng_event *ev)
347c5ab5
DG
790{
791 int err;
0e115563 792 char *agent_filter = NULL;
347c5ab5
DG
793
794 assert(ev);
795
796 /* Don't add filter for the '*' event. */
797 if (ev->name[0] != '*') {
798 if (filter) {
0e115563 799 err = asprintf(&agent_filter, "(%s) && (logger_name == \"%s\")", filter,
347c5ab5
DG
800 ev->name);
801 } else {
0e115563 802 err = asprintf(&agent_filter, "logger_name == \"%s\"", ev->name);
347c5ab5
DG
803 }
804 if (err < 0) {
805 PERROR("asprintf");
6a556f7b 806 goto error;
347c5ab5
DG
807 }
808 }
809
810 /* Add loglevel filtering if any for the JUL domain. */
811 if (ev->loglevel_type != LTTNG_EVENT_LOGLEVEL_ALL) {
812 char *op;
813
814 if (ev->loglevel_type == LTTNG_EVENT_LOGLEVEL_RANGE) {
815 op = ">=";
816 } else {
817 op = "==";
818 }
819
0e115563 820 if (filter || agent_filter) {
6a556f7b
JG
821 char *new_filter;
822
fb0edb23 823 err = asprintf(&new_filter, "(%s) && (int_loglevel %s %d)",
0e115563 824 agent_filter ? agent_filter : filter, op,
347c5ab5 825 ev->loglevel);
0e115563
DG
826 if (agent_filter) {
827 free(agent_filter);
6a556f7b 828 }
0e115563 829 agent_filter = new_filter;
347c5ab5 830 } else {
0e115563 831 err = asprintf(&agent_filter, "int_loglevel %s %d", op,
347c5ab5
DG
832 ev->loglevel);
833 }
834 if (err < 0) {
835 PERROR("asprintf");
6a556f7b 836 goto error;
347c5ab5
DG
837 }
838 }
839
0e115563 840 return agent_filter;
6a556f7b 841error:
0e115563 842 free(agent_filter);
6a556f7b 843 return NULL;
347c5ab5
DG
844}
845
137b9942 846/*
ec166985 847 * Generate the filter bytecode from a given filter expression string. Put the
137b9942
DG
848 * newly allocated parser context in ctxp and populate the lsm object with the
849 * expression len.
850 *
851 * Return 0 on success else a LTTNG_ERR_* code and ctxp is untouched.
852 */
853static int generate_filter(char *filter_expression,
854 struct lttcomm_session_msg *lsm, struct filter_parser_ctx **ctxp)
855{
856 int ret;
857 struct filter_parser_ctx *ctx = NULL;
858 FILE *fmem = NULL;
859
860 assert(filter_expression);
861 assert(lsm);
862 assert(ctxp);
863
864 /*
865 * Casting const to non-const, as the underlying function will use it in
866 * read-only mode.
867 */
868 fmem = lttng_fmemopen((void *) filter_expression,
869 strlen(filter_expression), "r");
870 if (!fmem) {
871 fprintf(stderr, "Error opening memory as stream\n");
872 ret = -LTTNG_ERR_FILTER_NOMEM;
873 goto error;
874 }
875 ctx = filter_parser_ctx_alloc(fmem);
876 if (!ctx) {
877 fprintf(stderr, "Error allocating parser\n");
878 ret = -LTTNG_ERR_FILTER_NOMEM;
879 goto filter_alloc_error;
880 }
881 ret = filter_parser_ctx_append_ast(ctx);
882 if (ret) {
883 fprintf(stderr, "Parse error\n");
884 ret = -LTTNG_ERR_FILTER_INVAL;
885 goto parse_error;
886 }
887 ret = filter_visitor_set_parent(ctx);
888 if (ret) {
889 fprintf(stderr, "Set parent error\n");
890 ret = -LTTNG_ERR_FILTER_INVAL;
891 goto parse_error;
892 }
893 if (print_xml) {
894 ret = filter_visitor_print_xml(ctx, stdout, 0);
895 if (ret) {
896 fflush(stdout);
897 fprintf(stderr, "XML print error\n");
898 ret = -LTTNG_ERR_FILTER_INVAL;
899 goto parse_error;
900 }
901 }
902
903 dbg_printf("Generating IR... ");
904 fflush(stdout);
905 ret = filter_visitor_ir_generate(ctx);
906 if (ret) {
907 fprintf(stderr, "Generate IR error\n");
908 ret = -LTTNG_ERR_FILTER_INVAL;
909 goto parse_error;
910 }
911 dbg_printf("done\n");
912
913 dbg_printf("Validating IR... ");
914 fflush(stdout);
915 ret = filter_visitor_ir_check_binary_op_nesting(ctx);
916 if (ret) {
917 ret = -LTTNG_ERR_FILTER_INVAL;
918 goto parse_error;
919 }
9ae110e2 920 /* Validate strings used as literals in the expression. */
dcd5daf2
JG
921 ret = filter_visitor_ir_validate_string(ctx);
922 if (ret) {
923 ret = -LTTNG_ERR_FILTER_INVAL;
924 goto parse_error;
925 }
137b9942
DG
926 dbg_printf("done\n");
927
928 dbg_printf("Generating bytecode... ");
929 fflush(stdout);
930 ret = filter_visitor_bytecode_generate(ctx);
931 if (ret) {
932 fprintf(stderr, "Generate bytecode error\n");
933 ret = -LTTNG_ERR_FILTER_INVAL;
934 goto parse_error;
935 }
936 dbg_printf("done\n");
937 dbg_printf("Size of bytecode generated: %u bytes.\n",
938 bytecode_get_len(&ctx->bytecode->b));
939
940 lsm->u.enable.bytecode_len = sizeof(ctx->bytecode->b)
941 + bytecode_get_len(&ctx->bytecode->b);
942 lsm->u.enable.expression_len = strlen(filter_expression) + 1;
943
944 /* No need to keep the memory stream. */
945 if (fclose(fmem) != 0) {
6f04ed72 946 PERROR("fclose");
137b9942
DG
947 }
948
949 *ctxp = ctx;
950 return 0;
951
952parse_error:
137b9942
DG
953 filter_ir_free(ctx);
954 filter_parser_ctx_free(ctx);
955filter_alloc_error:
956 if (fclose(fmem) != 0) {
6f04ed72 957 PERROR("fclose");
137b9942
DG
958 }
959error:
960 return ret;
961}
962
93deb080
JI
963/*
964 * Enable event(s) for a channel, possibly with exclusions and a filter.
965 * If no event name is specified, all events are enabled.
966 * If no channel name is specified, the default name is used.
967 * If filter expression is not NULL, the filter is set for the event.
968 * If exclusion count is not zero, the exclusions are set for the event.
969 * Returns size of returned session payload data or a negative error code.
970 */
971int lttng_enable_event_with_exclusions(struct lttng_handle *handle,
972 struct lttng_event *ev, const char *channel_name,
e9efbcd3 973 const char *original_filter_expression,
93deb080
JI
974 int exclusion_count, char **exclusion_list)
975{
976 struct lttcomm_session_msg lsm;
64226865 977 char *varlen_data;
93deb080 978 int ret = 0;
137b9942 979 unsigned int free_filter_expression = 0;
93deb080 980 struct filter_parser_ctx *ctx = NULL;
e9efbcd3
JG
981 /*
982 * Cast as non-const since we may replace the filter expression
983 * by a dynamically allocated string. Otherwise, the original
984 * string is not modified.
985 */
986 char *filter_expression = (char *) original_filter_expression;
93deb080
JI
987
988 if (handle == NULL || ev == NULL) {
137b9942
DG
989 ret = -LTTNG_ERR_INVALID;
990 goto error;
93deb080
JI
991 }
992
9ae110e2
JG
993 /*
994 * Empty filter string will always be rejected by the parser
93deb080
JI
995 * anyway, so treat this corner-case early to eliminate
996 * lttng_fmemopen error for 0-byte allocation.
997 */
998 if (filter_expression && filter_expression[0] == '\0') {
137b9942
DG
999 ret = -LTTNG_ERR_INVALID;
1000 goto error;
93deb080
JI
1001 }
1002
1003 memset(&lsm, 0, sizeof(lsm));
1004
1005 /* If no channel name, send empty string. */
1006 if (channel_name == NULL) {
1007 lttng_ctl_copy_string(lsm.u.enable.channel_name, "",
1008 sizeof(lsm.u.enable.channel_name));
1009 } else {
1010 lttng_ctl_copy_string(lsm.u.enable.channel_name, channel_name,
1011 sizeof(lsm.u.enable.channel_name));
1012 }
1013
18a720cd
MD
1014 lsm.cmd_type = LTTNG_ENABLE_EVENT;
1015 if (ev->name[0] == '\0') {
1016 /* Enable all events */
1017 lttng_ctl_copy_string(ev->name, "*", sizeof(ev->name));
6565421f 1018 }
93deb080 1019
6565421f 1020 lttng_ctl_copy_lttng_domain(&lsm.domain, &handle->domain);
6e911cad 1021 /* FIXME: copying non-packed struct to packed struct. */
93deb080
JI
1022 memcpy(&lsm.u.enable.event, ev, sizeof(lsm.u.enable.event));
1023
1024 lttng_ctl_copy_string(lsm.session.name, handle->session_name,
1025 sizeof(lsm.session.name));
1026 lsm.u.enable.exclusion_count = exclusion_count;
1027 lsm.u.enable.bytecode_len = 0;
1028
9b21e6d5
DG
1029 /*
1030 * For the JUL domain, a filter is enforced except for the enable all
1031 * event. This is done to avoid having the event in all sessions thus
1032 * filtering by logger name.
1033 */
1034 if (exclusion_count == 0 && filter_expression == NULL &&
5cdb6027 1035 (handle->domain.type != LTTNG_DOMAIN_JUL &&
0e115563
DG
1036 handle->domain.type != LTTNG_DOMAIN_LOG4J &&
1037 handle->domain.type != LTTNG_DOMAIN_PYTHON)) {
3e1c9ff7 1038 goto ask_sessiond;
93deb080
JI
1039 }
1040
1041 /*
1042 * We have either a filter or some exclusions, so we need to set up
9ae110e2 1043 * a variable-length memory block from where to send the data.
93deb080
JI
1044 */
1045
9ae110e2 1046 /* Parse filter expression. */
5cdb6027 1047 if (filter_expression != NULL || handle->domain.type == LTTNG_DOMAIN_JUL
0e115563
DG
1048 || handle->domain.type == LTTNG_DOMAIN_LOG4J
1049 || handle->domain.type == LTTNG_DOMAIN_PYTHON) {
5cdb6027 1050 if (handle->domain.type == LTTNG_DOMAIN_JUL ||
0e115563
DG
1051 handle->domain.type == LTTNG_DOMAIN_LOG4J ||
1052 handle->domain.type == LTTNG_DOMAIN_PYTHON) {
1053 char *agent_filter;
64226865 1054
347c5ab5 1055 /* Setup JUL filter if needed. */
0e115563
DG
1056 agent_filter = set_agent_filter(filter_expression, ev);
1057 if (!agent_filter) {
137b9942 1058 if (!filter_expression) {
9ae110e2
JG
1059 /*
1060 * No JUL and no filter, just skip
1061 * everything below.
1062 */
137b9942
DG
1063 goto ask_sessiond;
1064 }
64226865
DG
1065 } else {
1066 /*
9ae110e2
JG
1067 * With an agent filter, the original filter has
1068 * been added to it thus replace the filter
1069 * expression.
64226865 1070 */
0e115563 1071 filter_expression = agent_filter;
e9efbcd3 1072 free_filter_expression = 1;
9b21e6d5 1073 }
9b21e6d5 1074 }
93deb080 1075
137b9942 1076 ret = generate_filter(filter_expression, &lsm, &ctx);
93deb080 1077 if (ret) {
137b9942 1078 goto filter_error;
93deb080 1079 }
6b453b5e
JG
1080 }
1081
1082 varlen_data = zmalloc(lsm.u.enable.bytecode_len
137b9942
DG
1083 + lsm.u.enable.expression_len
1084 + LTTNG_SYMBOL_NAME_LEN * exclusion_count);
6b453b5e
JG
1085 if (!varlen_data) {
1086 ret = -LTTNG_ERR_EXCLUSION_NOMEM;
7ca1dc6f 1087 goto mem_error;
6b453b5e 1088 }
137b9942 1089
9ae110e2 1090 /* Put exclusion names first in the data. */
6b453b5e
JG
1091 while (exclusion_count--) {
1092 strncpy(varlen_data + LTTNG_SYMBOL_NAME_LEN * exclusion_count,
0c82ac62
PP
1093 *(exclusion_list + exclusion_count),
1094 LTTNG_SYMBOL_NAME_LEN - 1);
6b453b5e 1095 }
9ae110e2 1096 /* Add filter expression next. */
6b453b5e
JG
1097 if (lsm.u.enable.expression_len != 0) {
1098 memcpy(varlen_data
1099 + LTTNG_SYMBOL_NAME_LEN * lsm.u.enable.exclusion_count,
1100 filter_expression,
1101 lsm.u.enable.expression_len);
1102 }
9ae110e2 1103 /* Add filter bytecode next. */
137b9942 1104 if (ctx && lsm.u.enable.bytecode_len != 0) {
6b453b5e
JG
1105 memcpy(varlen_data
1106 + LTTNG_SYMBOL_NAME_LEN * lsm.u.enable.exclusion_count
1107 + lsm.u.enable.expression_len,
1108 &ctx->bytecode->b,
1109 lsm.u.enable.bytecode_len);
93deb080
JI
1110 }
1111
795a978d 1112 ret = lttng_ctl_ask_sessiond_varlen_no_cmd_header(&lsm, varlen_data,
67676bd8 1113 (LTTNG_SYMBOL_NAME_LEN * lsm.u.enable.exclusion_count) +
9ae110e2
JG
1114 lsm.u.enable.bytecode_len + lsm.u.enable.expression_len,
1115 NULL);
6b453b5e 1116 free(varlen_data);
93deb080 1117
7ca1dc6f
DG
1118mem_error:
1119 if (filter_expression && ctx) {
93deb080
JI
1120 filter_bytecode_free(ctx);
1121 filter_ir_free(ctx);
1122 filter_parser_ctx_free(ctx);
7ca1dc6f
DG
1123 }
1124filter_error:
1125 if (free_filter_expression) {
1126 /*
9ae110e2
JG
1127 * The filter expression has been replaced and must be freed as
1128 * it is not the original filter expression received as a
1129 * parameter.
7ca1dc6f
DG
1130 */
1131 free(filter_expression);
93deb080 1132 }
137b9942
DG
1133error:
1134 /*
9ae110e2
JG
1135 * Return directly to the caller and don't ask the sessiond since
1136 * something went wrong in the parsing of data above.
137b9942 1137 */
93deb080 1138 return ret;
3e1c9ff7
DG
1139
1140ask_sessiond:
1141 ret = lttng_ctl_ask_sessiond(&lsm, NULL);
1142 return ret;
93deb080
JI
1143}
1144
6e911cad
MD
1145int lttng_disable_event_ext(struct lttng_handle *handle,
1146 struct lttng_event *ev, const char *channel_name,
1147 const char *original_filter_expression)
1df4dedd 1148{
cd80958d 1149 struct lttcomm_session_msg lsm;
6e911cad
MD
1150 char *varlen_data;
1151 int ret = 0;
1152 unsigned int free_filter_expression = 0;
1153 struct filter_parser_ctx *ctx = NULL;
1154 /*
1155 * Cast as non-const since we may replace the filter expression
1156 * by a dynamically allocated string. Otherwise, the original
1157 * string is not modified.
1158 */
1159 char *filter_expression = (char *) original_filter_expression;
1df4dedd 1160
6e911cad
MD
1161 if (handle == NULL || ev == NULL) {
1162 ret = -LTTNG_ERR_INVALID;
1163 goto error;
1164 }
1165
9ae110e2
JG
1166 /*
1167 * Empty filter string will always be rejected by the parser
6e911cad
MD
1168 * anyway, so treat this corner-case early to eliminate
1169 * lttng_fmemopen error for 0-byte allocation.
1170 */
1171 if (filter_expression && filter_expression[0] == '\0') {
1172 ret = -LTTNG_ERR_INVALID;
1173 goto error;
cd80958d
DG
1174 }
1175
441c16a7
MD
1176 memset(&lsm, 0, sizeof(lsm));
1177
85076754
MD
1178 /* If no channel name, send empty string. */
1179 if (channel_name == NULL) {
1180 lttng_ctl_copy_string(lsm.u.disable.channel_name, "",
cd80958d 1181 sizeof(lsm.u.disable.channel_name));
f3ed775e 1182 } else {
85076754 1183 lttng_ctl_copy_string(lsm.u.disable.channel_name, channel_name,
cd80958d 1184 sizeof(lsm.u.disable.channel_name));
eb354453
DG
1185 }
1186
18a720cd 1187 lsm.cmd_type = LTTNG_DISABLE_EVENT;
f3ed775e 1188
6e911cad
MD
1189 lttng_ctl_copy_lttng_domain(&lsm.domain, &handle->domain);
1190 /* FIXME: copying non-packed struct to packed struct. */
1191 memcpy(&lsm.u.disable.event, ev, sizeof(lsm.u.disable.event));
1192
cac3069d 1193 lttng_ctl_copy_string(lsm.session.name, handle->session_name,
cd80958d 1194 sizeof(lsm.session.name));
6e911cad 1195 lsm.u.disable.bytecode_len = 0;
cd80958d 1196
6e911cad
MD
1197 /*
1198 * For the JUL domain, a filter is enforced except for the
1199 * disable all event. This is done to avoid having the event in
1200 * all sessions thus filtering by logger name.
1201 */
1202 if (filter_expression == NULL &&
1203 (handle->domain.type != LTTNG_DOMAIN_JUL &&
0e115563
DG
1204 handle->domain.type != LTTNG_DOMAIN_LOG4J &&
1205 handle->domain.type != LTTNG_DOMAIN_PYTHON)) {
6e911cad
MD
1206 goto ask_sessiond;
1207 }
1208
1209 /*
1210 * We have a filter, so we need to set up a variable-length
1211 * memory block from where to send the data.
1212 */
1213
1214 /* Parse filter expression */
1215 if (filter_expression != NULL || handle->domain.type == LTTNG_DOMAIN_JUL
0e115563
DG
1216 || handle->domain.type == LTTNG_DOMAIN_LOG4J
1217 || handle->domain.type == LTTNG_DOMAIN_PYTHON) {
6e911cad 1218 if (handle->domain.type == LTTNG_DOMAIN_JUL ||
0e115563
DG
1219 handle->domain.type == LTTNG_DOMAIN_LOG4J ||
1220 handle->domain.type == LTTNG_DOMAIN_PYTHON) {
1221 char *agent_filter;
6e911cad
MD
1222
1223 /* Setup JUL filter if needed. */
0e115563
DG
1224 agent_filter = set_agent_filter(filter_expression, ev);
1225 if (!agent_filter) {
6e911cad 1226 if (!filter_expression) {
9ae110e2
JG
1227 /*
1228 * No JUL and no filter, just skip
1229 * everything below.
1230 */
6e911cad
MD
1231 goto ask_sessiond;
1232 }
1233 } else {
1234 /*
9ae110e2
JG
1235 * With a JUL filter, the original filter has
1236 * been added to it thus replace the filter
1237 * expression.
6e911cad 1238 */
0e115563 1239 filter_expression = agent_filter;
6e911cad
MD
1240 free_filter_expression = 1;
1241 }
1242 }
1243
1244 ret = generate_filter(filter_expression, &lsm, &ctx);
1245 if (ret) {
1246 goto filter_error;
1247 }
1248 }
1249
1250 varlen_data = zmalloc(lsm.u.disable.bytecode_len
1251 + lsm.u.disable.expression_len);
1252 if (!varlen_data) {
1253 ret = -LTTNG_ERR_EXCLUSION_NOMEM;
1254 goto mem_error;
1255 }
1256
9ae110e2 1257 /* Add filter expression. */
6e911cad
MD
1258 if (lsm.u.disable.expression_len != 0) {
1259 memcpy(varlen_data,
1260 filter_expression,
1261 lsm.u.disable.expression_len);
1262 }
9ae110e2 1263 /* Add filter bytecode next. */
6e911cad
MD
1264 if (ctx && lsm.u.disable.bytecode_len != 0) {
1265 memcpy(varlen_data
1266 + lsm.u.disable.expression_len,
1267 &ctx->bytecode->b,
1268 lsm.u.disable.bytecode_len);
1269 }
1270
795a978d 1271 ret = lttng_ctl_ask_sessiond_varlen_no_cmd_header(&lsm, varlen_data,
6e911cad
MD
1272 lsm.u.disable.bytecode_len + lsm.u.disable.expression_len, NULL);
1273 free(varlen_data);
1274
1275mem_error:
1276 if (filter_expression && ctx) {
1277 filter_bytecode_free(ctx);
1278 filter_ir_free(ctx);
1279 filter_parser_ctx_free(ctx);
1280 }
1281filter_error:
1282 if (free_filter_expression) {
1283 /*
9ae110e2
JG
1284 * The filter expression has been replaced and must be freed as
1285 * it is not the original filter expression received as a
1286 * parameter.
6e911cad
MD
1287 */
1288 free(filter_expression);
1289 }
1290error:
1291 /*
9ae110e2
JG
1292 * Return directly to the caller and don't ask the sessiond since
1293 * something went wrong in the parsing of data above.
6e911cad
MD
1294 */
1295 return ret;
1296
1297ask_sessiond:
1298 ret = lttng_ctl_ask_sessiond(&lsm, NULL);
1299 return ret;
1300}
1301
1302/*
9ae110e2
JG
1303 * Disable event(s) of a channel and domain.
1304 * If no event name is specified, all events are disabled.
1305 * If no channel name is specified, the default 'channel0' is used.
1306 * Returns size of returned session payload data or a negative error code.
6e911cad
MD
1307 */
1308int lttng_disable_event(struct lttng_handle *handle, const char *name,
1309 const char *channel_name)
1310{
1311 struct lttng_event ev;
1312
1313 memset(&ev, 0, sizeof(ev));
9b7431cf 1314 ev.loglevel = -1;
6e911cad
MD
1315 ev.type = LTTNG_EVENT_ALL;
1316 lttng_ctl_copy_string(ev.name, name, sizeof(ev.name));
1317 return lttng_disable_event_ext(handle, &ev, channel_name, NULL);
1df4dedd
DG
1318}
1319
1320/*
9ae110e2
JG
1321 * Enable channel per domain
1322 * Returns size of returned session payload data or a negative error code.
a5c5a2bd 1323 */
cd80958d 1324int lttng_enable_channel(struct lttng_handle *handle,
38057ed1 1325 struct lttng_channel *chan)
a5c5a2bd 1326{
cd80958d
DG
1327 struct lttcomm_session_msg lsm;
1328
9ae110e2 1329 /* NULL arguments are forbidden. No default values. */
5117eeec 1330 if (handle == NULL || chan == NULL) {
2f70b271 1331 return -LTTNG_ERR_INVALID;
cd80958d
DG
1332 }
1333
441c16a7
MD
1334 memset(&lsm, 0, sizeof(lsm));
1335
5117eeec 1336 memcpy(&lsm.u.channel.chan, chan, sizeof(lsm.u.channel.chan));
7d29a247 1337
cd80958d
DG
1338 lsm.cmd_type = LTTNG_ENABLE_CHANNEL;
1339
cac3069d 1340 lttng_ctl_copy_lttng_domain(&lsm.domain, &handle->domain);
7d29a247 1341
cac3069d 1342 lttng_ctl_copy_string(lsm.session.name, handle->session_name,
cd80958d
DG
1343 sizeof(lsm.session.name));
1344
cac3069d 1345 return lttng_ctl_ask_sessiond(&lsm, NULL);
8c0faa1d 1346}
1df4dedd 1347
2ef84c95 1348/*
9ae110e2
JG
1349 * All tracing will be stopped for registered events of the channel.
1350 * Returns size of returned session payload data or a negative error code.
2ef84c95 1351 */
cd80958d 1352int lttng_disable_channel(struct lttng_handle *handle, const char *name)
2ef84c95 1353{
cd80958d
DG
1354 struct lttcomm_session_msg lsm;
1355
9ae110e2 1356 /* Safety check. Both are mandatory. */
9d697d3d 1357 if (handle == NULL || name == NULL) {
2f70b271 1358 return -LTTNG_ERR_INVALID;
cd80958d
DG
1359 }
1360
441c16a7
MD
1361 memset(&lsm, 0, sizeof(lsm));
1362
cd80958d 1363 lsm.cmd_type = LTTNG_DISABLE_CHANNEL;
1df4dedd 1364
cac3069d 1365 lttng_ctl_copy_string(lsm.u.disable.channel_name, name,
9d697d3d
DG
1366 sizeof(lsm.u.disable.channel_name));
1367
cac3069d 1368 lttng_ctl_copy_lttng_domain(&lsm.domain, &handle->domain);
cd80958d 1369
cac3069d 1370 lttng_ctl_copy_string(lsm.session.name, handle->session_name,
cd80958d
DG
1371 sizeof(lsm.session.name));
1372
cac3069d 1373 return lttng_ctl_ask_sessiond(&lsm, NULL);
ca95a216
DG
1374}
1375
ccf10263 1376/*
9ae110e2
JG
1377 * Add PID to session tracker.
1378 * Return 0 on success else a negative LTTng error code.
ccf10263
MD
1379 */
1380int lttng_track_pid(struct lttng_handle *handle, int pid)
1381{
1382 struct lttcomm_session_msg lsm;
1383
9ae110e2 1384 /* NULL arguments are forbidden. No default values. */
ccf10263
MD
1385 if (handle == NULL) {
1386 return -LTTNG_ERR_INVALID;
1387 }
1388
1389 memset(&lsm, 0, sizeof(lsm));
1390
1391 lsm.cmd_type = LTTNG_TRACK_PID;
1392 lsm.u.pid_tracker.pid = pid;
1393
1394 lttng_ctl_copy_lttng_domain(&lsm.domain, &handle->domain);
1395
1396 lttng_ctl_copy_string(lsm.session.name, handle->session_name,
1397 sizeof(lsm.session.name));
1398
1399 return lttng_ctl_ask_sessiond(&lsm, NULL);
1400}
1401
1402/*
9ae110e2
JG
1403 * Remove PID from session tracker.
1404 * Return 0 on success else a negative LTTng error code.
ccf10263
MD
1405 */
1406int lttng_untrack_pid(struct lttng_handle *handle, int pid)
1407{
1408 struct lttcomm_session_msg lsm;
1409
9ae110e2 1410 /* NULL arguments are forbidden. No default values. */
ccf10263
MD
1411 if (handle == NULL) {
1412 return -LTTNG_ERR_INVALID;
1413 }
1414
1415 memset(&lsm, 0, sizeof(lsm));
1416
1417 lsm.cmd_type = LTTNG_UNTRACK_PID;
1418 lsm.u.pid_tracker.pid = pid;
1419
1420 lttng_ctl_copy_lttng_domain(&lsm.domain, &handle->domain);
1421
1422 lttng_ctl_copy_string(lsm.session.name, handle->session_name,
1423 sizeof(lsm.session.name));
1424
1425 return lttng_ctl_ask_sessiond(&lsm, NULL);
1426}
1427
fac6795d 1428/*
9ae110e2
JG
1429 * Lists all available tracepoints of domain.
1430 * Sets the contents of the events array.
1431 * Returns the number of lttng_event entries in events;
1432 * on error, returns a negative value.
fac6795d 1433 */
cd80958d 1434int lttng_list_tracepoints(struct lttng_handle *handle,
2a71efd5 1435 struct lttng_event **events)
fac6795d 1436{
052da939 1437 int ret;
cd80958d
DG
1438 struct lttcomm_session_msg lsm;
1439
9d697d3d 1440 if (handle == NULL) {
2f70b271 1441 return -LTTNG_ERR_INVALID;
cd80958d 1442 }
fac6795d 1443
53efb85a 1444 memset(&lsm, 0, sizeof(lsm));
cd80958d 1445 lsm.cmd_type = LTTNG_LIST_TRACEPOINTS;
cac3069d 1446 lttng_ctl_copy_lttng_domain(&lsm.domain, &handle->domain);
2a71efd5 1447
cac3069d 1448 ret = lttng_ctl_ask_sessiond(&lsm, (void **) events);
052da939
DG
1449 if (ret < 0) {
1450 return ret;
eb354453 1451 }
fac6795d 1452
9f19cc17 1453 return ret / sizeof(struct lttng_event);
fac6795d
DG
1454}
1455
f37d259d 1456/*
9ae110e2
JG
1457 * Lists all available tracepoint fields of domain.
1458 * Sets the contents of the event field array.
1459 * Returns the number of lttng_event_field entries in events;
1460 * on error, returns a negative value.
f37d259d
MD
1461 */
1462int lttng_list_tracepoint_fields(struct lttng_handle *handle,
1463 struct lttng_event_field **fields)
1464{
1465 int ret;
1466 struct lttcomm_session_msg lsm;
1467
1468 if (handle == NULL) {
2f70b271 1469 return -LTTNG_ERR_INVALID;
f37d259d
MD
1470 }
1471
53efb85a 1472 memset(&lsm, 0, sizeof(lsm));
f37d259d 1473 lsm.cmd_type = LTTNG_LIST_TRACEPOINT_FIELDS;
cac3069d 1474 lttng_ctl_copy_lttng_domain(&lsm.domain, &handle->domain);
f37d259d 1475
cac3069d 1476 ret = lttng_ctl_ask_sessiond(&lsm, (void **) fields);
f37d259d
MD
1477 if (ret < 0) {
1478 return ret;
1479 }
1480
1481 return ret / sizeof(struct lttng_event_field);
1482}
1483
834978fd 1484/*
9ae110e2
JG
1485 * Lists all available kernel system calls. Allocates and sets the contents of
1486 * the events array.
834978fd 1487 *
9ae110e2
JG
1488 * Returns the number of lttng_event entries in events; on error, returns a
1489 * negative value.
834978fd
DG
1490 */
1491int lttng_list_syscalls(struct lttng_event **events)
1492{
1493 int ret;
1494 struct lttcomm_session_msg lsm;
1495
1496 if (!events) {
1497 return -LTTNG_ERR_INVALID;
1498 }
1499
1500 memset(&lsm, 0, sizeof(lsm));
1501 lsm.cmd_type = LTTNG_LIST_SYSCALLS;
1502 /* Force kernel domain for system calls. */
1503 lsm.domain.type = LTTNG_DOMAIN_KERNEL;
1504
1505 ret = lttng_ctl_ask_sessiond(&lsm, (void **) events);
1506 if (ret < 0) {
1507 return ret;
1508 }
1509
1510 return ret / sizeof(struct lttng_event);
1511}
1512
1657e9bb 1513/*
9ae110e2
JG
1514 * Returns a human readable string describing
1515 * the error code (a negative value).
1657e9bb 1516 */
9a745bc7 1517const char *lttng_strerror(int code)
1657e9bb 1518{
f73fabfd 1519 return error_get_str(code);
1657e9bb
DG
1520}
1521
aaf97519 1522/*
a4b92340
DG
1523 * Create a brand new session using name and url for destination.
1524 *
f73fabfd 1525 * Returns LTTNG_OK on success or a negative error code.
00e2e675 1526 */
a4b92340 1527int lttng_create_session(const char *name, const char *url)
00e2e675 1528{
3dd05a85 1529 int ret;
a4b92340 1530 ssize_t size;
00e2e675 1531 struct lttcomm_session_msg lsm;
a4b92340 1532 struct lttng_uri *uris = NULL;
00e2e675 1533
a4b92340 1534 if (name == NULL) {
2f70b271 1535 return -LTTNG_ERR_INVALID;
00e2e675
DG
1536 }
1537
a4b92340 1538 memset(&lsm, 0, sizeof(lsm));
00e2e675 1539
a4b92340 1540 lsm.cmd_type = LTTNG_CREATE_SESSION;
cac3069d 1541 lttng_ctl_copy_string(lsm.session.name, name, sizeof(lsm.session.name));
a4b92340
DG
1542
1543 /* There should never be a data URL */
bc894455 1544 size = uri_parse_str_urls(url, NULL, &uris);
a4b92340 1545 if (size < 0) {
2f70b271 1546 return -LTTNG_ERR_INVALID;
00e2e675
DG
1547 }
1548
a4b92340
DG
1549 lsm.u.uri.size = size;
1550
795a978d 1551 ret = lttng_ctl_ask_sessiond_varlen_no_cmd_header(&lsm, uris,
cac3069d 1552 sizeof(struct lttng_uri) * size, NULL);
3dd05a85
DG
1553
1554 free(uris);
1555 return ret;
00e2e675
DG
1556}
1557
8028d920 1558/*
9ae110e2
JG
1559 * Destroy session using name.
1560 * Returns size of returned session payload data or a negative error code.
8028d920 1561 */
8fd2c92c 1562static
e20ee7c2 1563int _lttng_destroy_session(const char *session_name)
8028d920 1564{
cd80958d
DG
1565 struct lttcomm_session_msg lsm;
1566
843f5df9 1567 if (session_name == NULL) {
2f70b271 1568 return -LTTNG_ERR_INVALID;
cd80958d
DG
1569 }
1570
53efb85a 1571 memset(&lsm, 0, sizeof(lsm));
cd80958d 1572 lsm.cmd_type = LTTNG_DESTROY_SESSION;
843f5df9 1573
cac3069d
DG
1574 lttng_ctl_copy_string(lsm.session.name, session_name,
1575 sizeof(lsm.session.name));
cd80958d 1576
cac3069d 1577 return lttng_ctl_ask_sessiond(&lsm, NULL);
aaf97519
DG
1578}
1579
e20ee7c2
JD
1580/*
1581 * Stop the session and wait for the data before destroying it
1582 */
1583int lttng_destroy_session(const char *session_name)
1584{
1585 int ret;
1586
1587 /*
1588 * Stop the tracing and wait for the data.
1589 */
1590 ret = _lttng_stop_tracing(session_name, 1);
1591 if (ret && ret != -LTTNG_ERR_TRACE_ALREADY_STOPPED) {
1592 goto end;
1593 }
1594
1595 ret = _lttng_destroy_session(session_name);
1596end:
1597 return ret;
1598}
1599
1600/*
1601 * Destroy the session without waiting for the data.
1602 */
1603int lttng_destroy_session_no_wait(const char *session_name)
1604{
1605 int ret;
1606
1607 /*
1608 * Stop the tracing without waiting for the data.
1609 * The session might already have been stopped, so just
1610 * skip this error.
1611 */
1612 ret = _lttng_stop_tracing(session_name, 0);
1613 if (ret && ret != -LTTNG_ERR_TRACE_ALREADY_STOPPED) {
1614 goto end;
1615 }
1616
1617 ret = _lttng_destroy_session(session_name);
1618end:
1619 return ret;
1620}
1621
57167058 1622/*
9ae110e2
JG
1623 * Ask the session daemon for all available sessions.
1624 * Sets the contents of the sessions array.
1625 * Returns the number of lttng_session entries in sessions;
1626 * on error, returns a negative value.
57167058 1627 */
ca95a216 1628int lttng_list_sessions(struct lttng_session **sessions)
57167058 1629{
ca95a216 1630 int ret;
cd80958d 1631 struct lttcomm_session_msg lsm;
57167058 1632
53efb85a 1633 memset(&lsm, 0, sizeof(lsm));
cd80958d 1634 lsm.cmd_type = LTTNG_LIST_SESSIONS;
cac3069d 1635 ret = lttng_ctl_ask_sessiond(&lsm, (void**) sessions);
57167058 1636 if (ret < 0) {
ca95a216 1637 return ret;
57167058
DG
1638 }
1639
ca95a216 1640 return ret / sizeof(struct lttng_session);
57167058
DG
1641}
1642
d7ba1388
MD
1643int lttng_set_session_shm_path(const char *session_name,
1644 const char *shm_path)
1645{
1646 struct lttcomm_session_msg lsm;
1647
1648 if (session_name == NULL) {
1649 return -LTTNG_ERR_INVALID;
1650 }
1651
1652 memset(&lsm, 0, sizeof(lsm));
1653 lsm.cmd_type = LTTNG_SET_SESSION_SHM_PATH;
1654
1655 lttng_ctl_copy_string(lsm.session.name, session_name,
1656 sizeof(lsm.session.name));
1657 lttng_ctl_copy_string(lsm.u.set_shm_path.shm_path, shm_path,
1658 sizeof(lsm.u.set_shm_path.shm_path));
1659
1660 return lttng_ctl_ask_sessiond(&lsm, NULL);
1661}
1662
9f19cc17 1663/*
9ae110e2
JG
1664 * Ask the session daemon for all available domains of a session.
1665 * Sets the contents of the domains array.
1666 * Returns the number of lttng_domain entries in domains;
1667 * on error, returns a negative value.
9f19cc17 1668 */
330be774 1669int lttng_list_domains(const char *session_name,
cd80958d 1670 struct lttng_domain **domains)
9f19cc17
DG
1671{
1672 int ret;
cd80958d
DG
1673 struct lttcomm_session_msg lsm;
1674
330be774 1675 if (session_name == NULL) {
2f70b271 1676 return -LTTNG_ERR_INVALID;
cd80958d 1677 }
9f19cc17 1678
53efb85a 1679 memset(&lsm, 0, sizeof(lsm));
cd80958d
DG
1680 lsm.cmd_type = LTTNG_LIST_DOMAINS;
1681
cac3069d
DG
1682 lttng_ctl_copy_string(lsm.session.name, session_name,
1683 sizeof(lsm.session.name));
cd80958d 1684
cac3069d 1685 ret = lttng_ctl_ask_sessiond(&lsm, (void**) domains);
9f19cc17
DG
1686 if (ret < 0) {
1687 return ret;
1688 }
1689
1690 return ret / sizeof(struct lttng_domain);
1691}
1692
1693/*
9ae110e2
JG
1694 * Ask the session daemon for all available channels of a session.
1695 * Sets the contents of the channels array.
1696 * Returns the number of lttng_channel entries in channels;
1697 * on error, returns a negative value.
9f19cc17 1698 */
cd80958d
DG
1699int lttng_list_channels(struct lttng_handle *handle,
1700 struct lttng_channel **channels)
9f19cc17
DG
1701{
1702 int ret;
53e367f9
JG
1703 size_t channel_count, i;
1704 const size_t channel_size = sizeof(struct lttng_channel) +
1705 sizeof(struct lttcomm_channel_extended);
cd80958d 1706 struct lttcomm_session_msg lsm;
53e367f9 1707 void *extended_at;
cd80958d 1708
9d697d3d 1709 if (handle == NULL) {
53e367f9
JG
1710 ret = -LTTNG_ERR_INVALID;
1711 goto end;
cd80958d
DG
1712 }
1713
53efb85a 1714 memset(&lsm, 0, sizeof(lsm));
cd80958d 1715 lsm.cmd_type = LTTNG_LIST_CHANNELS;
cac3069d 1716 lttng_ctl_copy_string(lsm.session.name, handle->session_name,
cd80958d 1717 sizeof(lsm.session.name));
9f19cc17 1718
cac3069d 1719 lttng_ctl_copy_lttng_domain(&lsm.domain, &handle->domain);
9f19cc17 1720
cac3069d 1721 ret = lttng_ctl_ask_sessiond(&lsm, (void**) channels);
9f19cc17 1722 if (ret < 0) {
53e367f9
JG
1723 goto end;
1724 }
1725
1726 if (ret % channel_size) {
1727 ret = -LTTNG_ERR_UNK;
1728 free(*channels);
1729 *channels = NULL;
1730 goto end;
9f19cc17 1731 }
53e367f9 1732 channel_count = (size_t) ret / channel_size;
9f19cc17 1733
53e367f9
JG
1734 /* Set extended info pointers */
1735 extended_at = ((void *) *channels) +
1736 channel_count * sizeof(struct lttng_channel);
1737 for (i = 0; i < channel_count; i++) {
1738 struct lttng_channel *chan = &(*channels)[i];
1739
1740 chan->attr.extended.ptr = extended_at;
1741 extended_at += sizeof(struct lttcomm_channel_extended);
1742 }
1743
1744 ret = (int) channel_count;
1745end:
1746 return ret;
9f19cc17
DG
1747}
1748
1749/*
9ae110e2
JG
1750 * Ask the session daemon for all available events of a session channel.
1751 * Sets the contents of the events array.
1752 * Returns the number of lttng_event entries in events;
1753 * on error, returns a negative value.
9f19cc17 1754 */
cd80958d
DG
1755int lttng_list_events(struct lttng_handle *handle,
1756 const char *channel_name, struct lttng_event **events)
9f19cc17
DG
1757{
1758 int ret;
cd80958d 1759 struct lttcomm_session_msg lsm;
b4e3ceb9
PP
1760 struct lttcomm_event_command_header *cmd_header = NULL;
1761 size_t cmd_header_len;
1762 uint32_t nb_events, i;
1763 void *extended_at;
9f19cc17 1764
9d697d3d
DG
1765 /* Safety check. An handle and channel name are mandatory */
1766 if (handle == NULL || channel_name == NULL) {
2f70b271 1767 return -LTTNG_ERR_INVALID;
cd80958d
DG
1768 }
1769
53efb85a 1770 memset(&lsm, 0, sizeof(lsm));
cd80958d 1771 lsm.cmd_type = LTTNG_LIST_EVENTS;
cac3069d 1772 lttng_ctl_copy_string(lsm.session.name, handle->session_name,
cd80958d 1773 sizeof(lsm.session.name));
cac3069d 1774 lttng_ctl_copy_string(lsm.u.list.channel_name, channel_name,
cd80958d 1775 sizeof(lsm.u.list.channel_name));
cac3069d 1776 lttng_ctl_copy_lttng_domain(&lsm.domain, &handle->domain);
9f19cc17 1777
b4e3ceb9
PP
1778 ret = lttng_ctl_ask_sessiond_varlen(&lsm, NULL, 0, (void **) events,
1779 (void **) &cmd_header, &cmd_header_len);
9f19cc17 1780 if (ret < 0) {
b4e3ceb9 1781 goto error;
9f19cc17
DG
1782 }
1783
b4e3ceb9
PP
1784 /* Set number of events and free command header */
1785 nb_events = cmd_header->nb_events;
1786 if (nb_events > INT_MAX) {
1787 ret = -EOVERFLOW;
1788 goto error;
1789 }
1790 ret = (int) nb_events;
1791 free(cmd_header);
1792 cmd_header = NULL;
1793
1794 /* Set extended info pointers */
1795 extended_at = ((void*) (*events)) +
1796 nb_events * sizeof(struct lttng_event);
1797
1798 for (i = 0; i < nb_events; i++) {
1799 struct lttcomm_event_extended_header *ext_header;
1800 struct lttng_event *event = &(*events)[i];
1801
1802 event->extended.ptr = extended_at;
1803 ext_header =
1804 (struct lttcomm_event_extended_header *) extended_at;
1805 extended_at += sizeof(*ext_header);
1806 extended_at += ext_header->filter_len;
795d57ce
PP
1807 extended_at +=
1808 ext_header->nb_exclusions * LTTNG_SYMBOL_NAME_LEN;
b4e3ceb9
PP
1809 }
1810
1811 return ret;
1812error:
1813 free(cmd_header);
1814 free(*events);
1815 return ret;
9f19cc17
DG
1816}
1817
134e72ed
JG
1818int lttng_event_get_filter_expression(struct lttng_event *event,
1819 const char **filter_expression)
d31d3e8c
PP
1820{
1821 int ret = 0;
1822 struct lttcomm_event_extended_header *ext_header;
1823
134e72ed 1824 if (!event || !filter_expression) {
d31d3e8c
PP
1825 ret = -LTTNG_ERR_INVALID;
1826 goto end;
1827 }
1828
1829 ext_header = event->extended.ptr;
1830
1831 if (!ext_header) {
1832 /*
1833 * This can happen since the lttng_event structure is
1834 * used for other tasks where this pointer is never set.
1835 */
134e72ed 1836 *filter_expression = NULL;
d31d3e8c
PP
1837 goto end;
1838 }
1839
1840 if (ext_header->filter_len) {
134e72ed
JG
1841 *filter_expression = ((const char *) (ext_header)) +
1842 sizeof(*ext_header);
d31d3e8c 1843 } else {
134e72ed 1844 *filter_expression = NULL;
d31d3e8c
PP
1845 }
1846
1847end:
1848 return ret;
1849}
b4e3ceb9 1850
f086e50e
PP
1851int lttng_event_get_exclusion_name_count(struct lttng_event *event)
1852{
1853 int ret;
1854 struct lttcomm_event_extended_header *ext_header;
1855
1856 if (!event) {
1857 ret = -LTTNG_ERR_INVALID;
1858 goto end;
1859 }
1860
1861 ext_header = event->extended.ptr;
1862 if (!ext_header) {
1863 /*
1864 * This can happen since the lttng_event structure is
1865 * used for other tasks where this pointer is never set.
1866 */
1867 ret = 0;
1868 goto end;
1869 }
1870
1871 if (ext_header->nb_exclusions > INT_MAX) {
1872 ret = -LTTNG_ERR_OVERFLOW;
1873 goto end;
1874 }
1875 ret = (int) ext_header->nb_exclusions;
1876end:
1877 return ret;
1878}
1879
1880int lttng_event_get_exclusion_name(struct lttng_event *event,
1881 size_t index, const char **exclusion_name)
1882{
1883 int ret = 0;
1884 struct lttcomm_event_extended_header *ext_header;
1885 void *at;
1886
1887 if (!event || !exclusion_name) {
1888 ret = -LTTNG_ERR_INVALID;
1889 goto end;
1890 }
1891
1892 ext_header = event->extended.ptr;
1893 if (!ext_header) {
1894 ret = -LTTNG_ERR_INVALID;
1895 goto end;
1896 }
1897
1898 if (index >= ext_header->nb_exclusions) {
1899 ret = -LTTNG_ERR_INVALID;
1900 goto end;
1901 }
1902
1903 at = (void *) ext_header + sizeof(*ext_header);
1904 at += ext_header->filter_len;
1905 at += index * LTTNG_SYMBOL_NAME_LEN;
1906 *exclusion_name = at;
1907
1908end:
1909 return ret;
1910}
1911
fac6795d 1912/*
1c8d13c8
TD
1913 * Sets the tracing_group variable with name.
1914 * This function allocates memory pointed to by tracing_group.
1915 * On success, returns 0, on error, returns -1 (null name) or -ENOMEM.
fac6795d
DG
1916 */
1917int lttng_set_tracing_group(const char *name)
1918{
9d697d3d 1919 if (name == NULL) {
2f70b271 1920 return -LTTNG_ERR_INVALID;
9d697d3d
DG
1921 }
1922
fac6795d 1923 if (asprintf(&tracing_group, "%s", name) < 0) {
2f70b271 1924 return -LTTNG_ERR_FATAL;
fac6795d
DG
1925 }
1926
1927 return 0;
1928}
1929
d0254c7c 1930/*
af87c45a 1931 * Returns size of returned session payload data or a negative error code.
d0254c7c 1932 */
cd80958d 1933int lttng_calibrate(struct lttng_handle *handle,
d0254c7c
MD
1934 struct lttng_calibrate *calibrate)
1935{
cd80958d 1936 struct lttcomm_session_msg lsm;
d0254c7c 1937
9d697d3d
DG
1938 /* Safety check. NULL pointer are forbidden */
1939 if (handle == NULL || calibrate == NULL) {
2f70b271 1940 return -LTTNG_ERR_INVALID;
cd80958d 1941 }
d0254c7c 1942
53efb85a 1943 memset(&lsm, 0, sizeof(lsm));
cd80958d 1944 lsm.cmd_type = LTTNG_CALIBRATE;
cac3069d 1945 lttng_ctl_copy_lttng_domain(&lsm.domain, &handle->domain);
d0254c7c 1946
cd80958d
DG
1947 memcpy(&lsm.u.calibrate, calibrate, sizeof(lsm.u.calibrate));
1948
cac3069d 1949 return lttng_ctl_ask_sessiond(&lsm, NULL);
d0254c7c
MD
1950}
1951
5edd7e09
DG
1952/*
1953 * Set default channel attributes.
441c16a7 1954 * If either or both of the arguments are null, attr content is zeroe'd.
5edd7e09
DG
1955 */
1956void lttng_channel_set_default_attr(struct lttng_domain *domain,
1957 struct lttng_channel_attr *attr)
1958{
1959 /* Safety check */
1960 if (attr == NULL || domain == NULL) {
1961 return;
1962 }
1963
eacaa7a6
DS
1964 memset(attr, 0, sizeof(struct lttng_channel_attr));
1965
0a9c6494
DG
1966 /* Same for all domains. */
1967 attr->overwrite = DEFAULT_CHANNEL_OVERWRITE;
1968 attr->tracefile_size = DEFAULT_CHANNEL_TRACEFILE_SIZE;
1969 attr->tracefile_count = DEFAULT_CHANNEL_TRACEFILE_COUNT;
1970
5edd7e09
DG
1971 switch (domain->type) {
1972 case LTTNG_DOMAIN_KERNEL:
9ae110e2
JG
1973 attr->switch_timer_interval =
1974 DEFAULT_KERNEL_CHANNEL_SWITCH_TIMER;
d92ff3ef 1975 attr->read_timer_interval = DEFAULT_KERNEL_CHANNEL_READ_TIMER;
3e230f92 1976 attr->subbuf_size = default_get_kernel_channel_subbuf_size();
5edd7e09
DG
1977 attr->num_subbuf = DEFAULT_KERNEL_CHANNEL_SUBBUF_NUM;
1978 attr->output = DEFAULT_KERNEL_CHANNEL_OUTPUT;
1979 break;
1980 case LTTNG_DOMAIN_UST:
0a9c6494
DG
1981 switch (domain->buf_type) {
1982 case LTTNG_BUFFER_PER_UID:
1983 attr->subbuf_size = default_get_ust_uid_channel_subbuf_size();
1984 attr->num_subbuf = DEFAULT_UST_UID_CHANNEL_SUBBUF_NUM;
1985 attr->output = DEFAULT_UST_UID_CHANNEL_OUTPUT;
9ae110e2
JG
1986 attr->switch_timer_interval =
1987 DEFAULT_UST_UID_CHANNEL_SWITCH_TIMER;
1988 attr->read_timer_interval =
1989 DEFAULT_UST_UID_CHANNEL_READ_TIMER;
0a9c6494
DG
1990 break;
1991 case LTTNG_BUFFER_PER_PID:
1992 default:
1993 attr->subbuf_size = default_get_ust_pid_channel_subbuf_size();
1994 attr->num_subbuf = DEFAULT_UST_PID_CHANNEL_SUBBUF_NUM;
1995 attr->output = DEFAULT_UST_PID_CHANNEL_OUTPUT;
9ae110e2
JG
1996 attr->switch_timer_interval =
1997 DEFAULT_UST_PID_CHANNEL_SWITCH_TIMER;
1998 attr->read_timer_interval =
1999 DEFAULT_UST_PID_CHANNEL_READ_TIMER;
0a9c6494
DG
2000 break;
2001 }
5edd7e09 2002 default:
441c16a7 2003 /* Default behavior: leave set to 0. */
5edd7e09
DG
2004 break;
2005 }
2006}
2007
5ba3702f
JG
2008int lttng_channel_get_discarded_event_count(struct lttng_channel *channel,
2009 uint64_t *discarded_events)
2010{
2011 int ret = 0;
2012 struct lttcomm_channel_extended *chan_ext;
2013
2014 if (!channel || !discarded_events) {
2015 ret = -LTTNG_ERR_INVALID;
2016 goto end;
2017 }
2018
2019 chan_ext = channel->attr.extended.ptr;
2020 if (!chan_ext) {
2021 /*
2022 * This can happen since the lttng_channel structure is
2023 * used for other tasks where this pointer is never set.
2024 */
2025 *discarded_events = 0;
2026 goto end;
2027 }
2028
2029 *discarded_events = chan_ext->discarded_events;
2030end:
2031 return ret;
2032}
2033
2034int lttng_channel_get_lost_packet_count(struct lttng_channel *channel,
2035 uint64_t *lost_packets)
2036{
2037 int ret = 0;
2038 struct lttcomm_channel_extended *chan_ext;
2039
2040 if (!channel || !lost_packets) {
2041 ret = -LTTNG_ERR_INVALID;
2042 goto end;
2043 }
2044
2045 chan_ext = channel->attr.extended.ptr;
2046 if (!chan_ext) {
2047 /*
2048 * This can happen since the lttng_channel structure is
2049 * used for other tasks where this pointer is never set.
2050 */
2051 *lost_packets = 0;
2052 goto end;
2053 }
2054
2055 *lost_packets = chan_ext->lost_packets;
2056end:
2057 return ret;
2058}
2059
fac6795d 2060/*
2269e89e 2061 * Check if session daemon is alive.
fac6795d 2062 *
2269e89e 2063 * Return 1 if alive or 0 if not.
1c8d13c8 2064 * On error returns a negative value.
fac6795d 2065 */
947308c4 2066int lttng_session_daemon_alive(void)
fac6795d
DG
2067{
2068 int ret;
2069
2070 ret = set_session_daemon_path();
2071 if (ret < 0) {
9ae110e2 2072 /* Error. */
fac6795d
DG
2073 return ret;
2074 }
2075
9d035200 2076 if (*sessiond_sock_path == '\0') {
2f70b271 2077 /*
9ae110e2
JG
2078 * No socket path set. Weird error which means the constructor
2079 * was not called.
2f70b271
DG
2080 */
2081 assert(0);
fac6795d
DG
2082 }
2083
2269e89e 2084 ret = try_connect_sessiond(sessiond_sock_path);
7d8234d9 2085 if (ret < 0) {
9ae110e2 2086 /* Not alive. */
7d8234d9
MD
2087 return 0;
2088 }
7d8234d9 2089
9ae110e2 2090 /* Is alive. */
947308c4 2091 return 1;
fac6795d
DG
2092}
2093
00e2e675 2094/*
a4b92340 2095 * Set URL for a consumer for a session and domain.
00e2e675
DG
2096 *
2097 * Return 0 on success, else a negative value.
2098 */
a4b92340
DG
2099int lttng_set_consumer_url(struct lttng_handle *handle,
2100 const char *control_url, const char *data_url)
00e2e675 2101{
3dd05a85 2102 int ret;
a4b92340 2103 ssize_t size;
00e2e675 2104 struct lttcomm_session_msg lsm;
a4b92340 2105 struct lttng_uri *uris = NULL;
00e2e675 2106
a4b92340 2107 if (handle == NULL || (control_url == NULL && data_url == NULL)) {
2f70b271 2108 return -LTTNG_ERR_INVALID;
00e2e675
DG
2109 }
2110
a4b92340
DG
2111 memset(&lsm, 0, sizeof(lsm));
2112
00e2e675
DG
2113 lsm.cmd_type = LTTNG_SET_CONSUMER_URI;
2114
cac3069d 2115 lttng_ctl_copy_string(lsm.session.name, handle->session_name,
00e2e675 2116 sizeof(lsm.session.name));
cac3069d 2117 lttng_ctl_copy_lttng_domain(&lsm.domain, &handle->domain);
00e2e675 2118
bc894455 2119 size = uri_parse_str_urls(control_url, data_url, &uris);
a4b92340 2120 if (size < 0) {
2f70b271 2121 return -LTTNG_ERR_INVALID;
a4b92340
DG
2122 }
2123
2124 lsm.u.uri.size = size;
00e2e675 2125
795a978d 2126 ret = lttng_ctl_ask_sessiond_varlen_no_cmd_header(&lsm, uris,
cac3069d 2127 sizeof(struct lttng_uri) * size, NULL);
3dd05a85
DG
2128
2129 free(uris);
2130 return ret;
00e2e675
DG
2131}
2132
2133/*
9c6bda17 2134 * [OBSOLETE]
00e2e675
DG
2135 */
2136int lttng_enable_consumer(struct lttng_handle *handle)
2137{
785d2d0d 2138 return -ENOSYS;
00e2e675
DG
2139}
2140
2141/*
9c6bda17 2142 * [OBSOLETE]
00e2e675
DG
2143 */
2144int lttng_disable_consumer(struct lttng_handle *handle)
2145{
785d2d0d 2146 return -ENOSYS;
00e2e675
DG
2147}
2148
07424f16
DG
2149/*
2150 * This is an extension of create session that is ONLY and SHOULD only be used
2151 * by the lttng command line program. It exists to avoid using URI parsing in
2152 * the lttng client.
2153 *
2154 * We need the date and time for the trace path subdirectory for the case where
2155 * the user does NOT define one using either -o or -U. Using the normal
2156 * lttng_create_session API call, we have no clue on the session daemon side if
2157 * the URL was generated automatically by the client or define by the user.
2158 *
2159 * So this function "wrapper" is hidden from the public API, takes the datetime
2160 * string and appends it if necessary to the URI subdirectory before sending it
2161 * to the session daemon.
2162 *
2163 * With this extra function, the lttng_create_session call behavior is not
2164 * changed and the timestamp is appended to the URI on the session daemon side
2165 * if necessary.
2166 */
2167int _lttng_create_session_ext(const char *name, const char *url,
2168 const char *datetime)
2169{
3dd05a85 2170 int ret;
07424f16
DG
2171 ssize_t size;
2172 struct lttcomm_session_msg lsm;
2173 struct lttng_uri *uris = NULL;
2174
2bba9e53 2175 if (name == NULL || datetime == NULL) {
2f70b271 2176 return -LTTNG_ERR_INVALID;
07424f16
DG
2177 }
2178
2179 memset(&lsm, 0, sizeof(lsm));
2180
2181 lsm.cmd_type = LTTNG_CREATE_SESSION;
cac3069d 2182 lttng_ctl_copy_string(lsm.session.name, name, sizeof(lsm.session.name));
07424f16 2183
9ae110e2 2184 /* There should never be a data URL. */
bc894455 2185 size = uri_parse_str_urls(url, NULL, &uris);
07424f16 2186 if (size < 0) {
3dd05a85
DG
2187 ret = -LTTNG_ERR_INVALID;
2188 goto error;
07424f16
DG
2189 }
2190
2191 lsm.u.uri.size = size;
2192
4b35a6b3 2193 if (size > 0 && uris[0].dtype != LTTNG_DST_PATH && strlen(uris[0].subdir) == 0) {
da4aa2b8
DG
2194 /* Don't append datetime if the name was automatically created. */
2195 if (strncmp(name, DEFAULT_SESSION_NAME "-",
2196 strlen(DEFAULT_SESSION_NAME) + 1)) {
2197 ret = snprintf(uris[0].subdir, sizeof(uris[0].subdir), "%s-%s",
2198 name, datetime);
2199 } else {
2200 ret = snprintf(uris[0].subdir, sizeof(uris[0].subdir), "%s", name);
2201 }
07424f16
DG
2202 if (ret < 0) {
2203 PERROR("snprintf uri subdir");
3dd05a85
DG
2204 ret = -LTTNG_ERR_FATAL;
2205 goto error;
07424f16
DG
2206 }
2207 }
2208
795a978d 2209 ret = lttng_ctl_ask_sessiond_varlen_no_cmd_header(&lsm, uris,
cac3069d 2210 sizeof(struct lttng_uri) * size, NULL);
3dd05a85
DG
2211
2212error:
2213 free(uris);
2214 return ret;
07424f16
DG
2215}
2216
806e2684
DG
2217/*
2218 * For a given session name, this call checks if the data is ready to be read
2219 * or is still being extracted by the consumer(s) hence not ready to be used by
2220 * any readers.
2221 */
6d805429 2222int lttng_data_pending(const char *session_name)
806e2684
DG
2223{
2224 int ret;
2225 struct lttcomm_session_msg lsm;
f6151c55 2226 uint8_t *pending = NULL;
806e2684
DG
2227
2228 if (session_name == NULL) {
2229 return -LTTNG_ERR_INVALID;
2230 }
2231
53efb85a 2232 memset(&lsm, 0, sizeof(lsm));
6d805429 2233 lsm.cmd_type = LTTNG_DATA_PENDING;
806e2684 2234
cac3069d
DG
2235 lttng_ctl_copy_string(lsm.session.name, session_name,
2236 sizeof(lsm.session.name));
806e2684 2237
f6151c55
JG
2238 ret = lttng_ctl_ask_sessiond(&lsm, (void **) &pending);
2239 if (ret < 0) {
2240 goto end;
2241 } else if (ret != 1) {
2242 /* Unexpected payload size */
2243 ret = -LTTNG_ERR_INVALID;
2244 goto end;
806e2684
DG
2245 }
2246
f6151c55
JG
2247 ret = (int) *pending;
2248end:
2249 free(pending);
806e2684
DG
2250 return ret;
2251}
2252
27babd3a
DG
2253/*
2254 * Create a session exclusively used for snapshot.
2255 *
2256 * Returns LTTNG_OK on success or a negative error code.
2257 */
2258int lttng_create_session_snapshot(const char *name, const char *snapshot_url)
2259{
2260 int ret;
2261 ssize_t size;
2262 struct lttcomm_session_msg lsm;
2263 struct lttng_uri *uris = NULL;
2264
2265 if (name == NULL) {
2266 return -LTTNG_ERR_INVALID;
2267 }
2268
2269 memset(&lsm, 0, sizeof(lsm));
2270
2271 lsm.cmd_type = LTTNG_CREATE_SESSION_SNAPSHOT;
2272 lttng_ctl_copy_string(lsm.session.name, name, sizeof(lsm.session.name));
2273
2274 size = uri_parse_str_urls(snapshot_url, NULL, &uris);
2275 if (size < 0) {
2276 return -LTTNG_ERR_INVALID;
2277 }
2278
2279 lsm.u.uri.size = size;
2280
795a978d 2281 ret = lttng_ctl_ask_sessiond_varlen_no_cmd_header(&lsm, uris,
27babd3a
DG
2282 sizeof(struct lttng_uri) * size, NULL);
2283
2284 free(uris);
2285 return ret;
2286}
2287
ecc48a90
JD
2288/*
2289 * Create a session exclusively used for live.
2290 *
2291 * Returns LTTNG_OK on success or a negative error code.
2292 */
2293int lttng_create_session_live(const char *name, const char *url,
2294 unsigned int timer_interval)
2295{
2296 int ret;
2297 ssize_t size;
2298 struct lttcomm_session_msg lsm;
2299 struct lttng_uri *uris = NULL;
2300
92805ee4 2301 if (name == NULL || timer_interval == 0) {
ecc48a90
JD
2302 return -LTTNG_ERR_INVALID;
2303 }
2304
2305 memset(&lsm, 0, sizeof(lsm));
2306
2307 lsm.cmd_type = LTTNG_CREATE_SESSION_LIVE;
2308 lttng_ctl_copy_string(lsm.session.name, name, sizeof(lsm.session.name));
2309
1a241656
DG
2310 if (url) {
2311 size = uri_parse_str_urls(url, NULL, &uris);
2312 if (size <= 0) {
2313 ret = -LTTNG_ERR_INVALID;
2314 goto end;
2315 }
ecc48a90 2316
1a241656
DG
2317 /* file:// is not accepted for live session. */
2318 if (uris[0].dtype == LTTNG_DST_PATH) {
2319 ret = -LTTNG_ERR_INVALID;
2320 goto end;
2321 }
2322 } else {
2323 size = 0;
ecc48a90
JD
2324 }
2325
2326 lsm.u.session_live.nb_uri = size;
2327 lsm.u.session_live.timer_interval = timer_interval;
2328
795a978d 2329 ret = lttng_ctl_ask_sessiond_varlen_no_cmd_header(&lsm, uris,
ecc48a90
JD
2330 sizeof(struct lttng_uri) * size, NULL);
2331
2332end:
2333 free(uris);
2334 return ret;
2335}
2336
a5dfbb9d
MD
2337/*
2338 * List PIDs in the tracker.
2339 *
1b18ce93
JG
2340 * enabled is set to whether the PID tracker is enabled.
2341 * pids is set to an allocated array of PIDs currently tracked. On
2342 * success, pids must be freed by the caller.
2343 * nr_pids is set to the number of entries contained by the pids array.
a5dfbb9d
MD
2344 *
2345 * Returns 0 on success, else a negative LTTng error code.
2346 */
2347int lttng_list_tracker_pids(struct lttng_handle *handle,
2348 int *_enabled, int32_t **_pids, size_t *_nr_pids)
2349{
ebbf5ab7
JR
2350 int ret;
2351 int enabled = 1;
a5dfbb9d
MD
2352 struct lttcomm_session_msg lsm;
2353 size_t nr_pids;
2354 int32_t *pids;
2355
2356 if (handle == NULL) {
2357 return -LTTNG_ERR_INVALID;
2358 }
2359
2360 memset(&lsm, 0, sizeof(lsm));
2361 lsm.cmd_type = LTTNG_LIST_TRACKER_PIDS;
2362 lttng_ctl_copy_string(lsm.session.name, handle->session_name,
2363 sizeof(lsm.session.name));
2364 lttng_ctl_copy_lttng_domain(&lsm.domain, &handle->domain);
2365
2366 ret = lttng_ctl_ask_sessiond(&lsm, (void **) &pids);
2367 if (ret < 0) {
2368 return ret;
2369 }
2370 nr_pids = ret / sizeof(int32_t);
2371 if (nr_pids == 1 && pids[0] == -1) {
2372 free(pids);
2373 pids = NULL;
2374 enabled = 0;
2375 nr_pids = 0;
2376 }
2377 *_enabled = enabled;
2378 *_pids = pids;
2379 *_nr_pids = nr_pids;
2380 return 0;
2381}
2382
93ec662e
JD
2383/*
2384 * Regenerate the metadata for a session.
2385 * Return 0 on success, a negative error code on error.
2386 */
eded6438 2387int lttng_regenerate_metadata(const char *session_name)
93ec662e
JD
2388{
2389 int ret;
2390 struct lttcomm_session_msg lsm;
2391
2392 if (!session_name) {
2393 ret = -LTTNG_ERR_INVALID;
2394 goto end;
2395 }
2396
2397 memset(&lsm, 0, sizeof(lsm));
eded6438 2398 lsm.cmd_type = LTTNG_REGENERATE_METADATA;
93ec662e
JD
2399
2400 lttng_ctl_copy_string(lsm.session.name, session_name,
2401 sizeof(lsm.session.name));
2402
2403 ret = lttng_ctl_ask_sessiond(&lsm, NULL);
2404 if (ret < 0) {
2405 goto end;
2406 }
2407
2408 ret = 0;
2409end:
2410 return ret;
2411}
2412
eded6438
JD
2413/*
2414 * Deprecated, replaced by lttng_regenerate_metadata.
2415 */
2416int lttng_metadata_regenerate(const char *session_name)
2417{
2418 return lttng_regenerate_metadata(session_name);
2419}
2420
fac6795d 2421/*
9ae110e2 2422 * lib constructor.
fac6795d 2423 */
b2b89e8a 2424static void __attribute__((constructor)) init(void)
fac6795d
DG
2425{
2426 /* Set default session group */
bbccc3d2 2427 lttng_set_tracing_group(DEFAULT_TRACING_GROUP);
fac6795d 2428}
49cca668
DG
2429
2430/*
9ae110e2 2431 * lib destructor.
49cca668 2432 */
b2b89e8a 2433static void __attribute__((destructor)) lttng_ctl_exit(void)
49cca668
DG
2434{
2435 free(tracing_group);
2436}
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