Clean-up: ust-consumer: replace manual metadata cache buffer allocation
[lttng-tools.git] / src / lib / lttng-ctl / lttng-ctl.c
CommitLineData
826d496d 1/*
eb5c4f4e 2 * lttng-ctl.c
82a3637f
DG
3 *
4 * Linux Trace Toolkit Control Library
5 *
826d496d 6 * Copyright (C) 2011 David Goulet <david.goulet@polymtl.ca>
ab5be9fa 7 * Copyright (C) 2016 Jérémie Galarneau <jeremie.galarneau@efficios.com>
fac6795d 8 *
ab5be9fa 9 * SPDX-License-Identifier: LGPL-2.1-only
82a3637f 10 *
fac6795d
DG
11 */
12
6c1c0768 13#define _LGPL_SOURCE
44a5e5eb 14#include <assert.h>
fac6795d
DG
15#include <grp.h>
16#include <stdio.h>
17#include <stdlib.h>
18#include <string.h>
19#include <unistd.h>
20
990570ed 21#include <common/common.h>
edf4b93e 22#include <common/compat/errno.h>
15e37663 23#include <common/compat/string.h>
990570ed 24#include <common/defaults.h>
159b042f 25#include <common/dynamic-buffer.h>
fe489250 26#include <common/dynamic-array.h>
9e620ea7
JG
27#include <common/payload.h>
28#include <common/payload-view.h>
db758600 29#include <common/sessiond-comm/sessiond-comm.h>
159b042f 30#include <common/tracker.h>
fe489250 31#include <common/unix.h>
a4b92340 32#include <common/uri.h>
feb0f3e5 33#include <common/utils.h>
a58c490f 34#include <lttng/channel-internal.h>
159b042f
JG
35#include <lttng/destruction-handle.h>
36#include <lttng/endpoint.h>
de453daa 37#include <lttng/event-internal.h>
159b042f
JG
38#include <lttng/health-internal.h>
39#include <lttng/lttng.h>
b178f53e 40#include <lttng/session-descriptor-internal.h>
159b042f
JG
41#include <lttng/session-internal.h>
42#include <lttng/trigger/trigger-internal.h>
43#include <lttng/userspace-probe-internal.h>
fe489250 44#include <lttng/lttng-error.h>
fac6795d 45
e4d2f27a
JR
46#include <common/filter/filter-ast.h>
47#include <common/filter/filter-parser.h>
48#include <common/filter/filter-bytecode.h>
49#include <common/filter/memstream.h>
cac3069d 50#include "lttng-ctl-helper.h"
53a80697 51
60160d2a
JG
52#define COPY_DOMAIN_PACKED(dst, src) \
53do { \
54 struct lttng_domain _tmp_domain; \
55 \
56 lttng_ctl_copy_lttng_domain(&_tmp_domain, &src); \
57 dst = _tmp_domain; \
58} while (0)
53a80697 59
fac6795d 60/* Socket to session daemon for communication */
3e3665b8 61static int sessiond_socket = -1;
fac6795d
DG
62static char sessiond_sock_path[PATH_MAX];
63
fac6795d
DG
64/* Variables */
65static char *tracing_group;
66static int connected;
67
97e19046
DG
68/* Global */
69
70/*
71 * Those two variables are used by error.h to silent or control the verbosity of
72 * error message. They are global to the library so application linking with it
73 * are able to compile correctly and also control verbosity of the library.
97e19046
DG
74 */
75int lttng_opt_quiet;
76int lttng_opt_verbose;
c7e35b03 77int lttng_opt_mi;
97e19046 78
fac6795d 79/*
cd80958d 80 * Copy domain to lttcomm_session_msg domain.
fac6795d 81 *
cd80958d
DG
82 * If domain is unknown, default domain will be the kernel.
83 */
cac3069d
DG
84LTTNG_HIDDEN
85void lttng_ctl_copy_lttng_domain(struct lttng_domain *dst,
86 struct lttng_domain *src)
cd80958d
DG
87{
88 if (src && dst) {
89 switch (src->type) {
00e2e675
DG
90 case LTTNG_DOMAIN_KERNEL:
91 case LTTNG_DOMAIN_UST:
b9dfb167 92 case LTTNG_DOMAIN_JUL:
5cdb6027 93 case LTTNG_DOMAIN_LOG4J:
0e115563 94 case LTTNG_DOMAIN_PYTHON:
00e2e675
DG
95 memcpy(dst, src, sizeof(struct lttng_domain));
96 break;
97 default:
98 memset(dst, 0, sizeof(struct lttng_domain));
00e2e675 99 break;
cd80958d
DG
100 }
101 }
102}
103
104/*
105 * Send lttcomm_session_msg to the session daemon.
fac6795d 106 *
1c8d13c8
TD
107 * On success, returns the number of bytes sent (>=0)
108 * On error, returns -1
fac6795d 109 */
cd80958d 110static int send_session_msg(struct lttcomm_session_msg *lsm)
fac6795d
DG
111{
112 int ret;
113
114 if (!connected) {
2f70b271 115 ret = -LTTNG_ERR_NO_SESSIOND;
e065084a 116 goto end;
fac6795d
DG
117 }
118
19f912db
FD
119 DBG("LSM cmd type: '%s' (%d)", lttcomm_sessiond_command_str(lsm->cmd_type),
120 lsm->cmd_type);
a4b92340 121
be040666 122 ret = lttcomm_send_creds_unix_sock(sessiond_socket, lsm,
cd80958d 123 sizeof(struct lttcomm_session_msg));
2f70b271
DG
124 if (ret < 0) {
125 ret = -LTTNG_ERR_FATAL;
126 }
e065084a
DG
127
128end:
129 return ret;
130}
131
53a80697
MD
132/*
133 * Send var len data to the session daemon.
134 *
135 * On success, returns the number of bytes sent (>=0)
136 * On error, returns -1
137 */
c2d69327 138static int send_session_varlen(const void *data, size_t len)
53a80697
MD
139{
140 int ret;
141
142 if (!connected) {
2f70b271 143 ret = -LTTNG_ERR_NO_SESSIOND;
53a80697
MD
144 goto end;
145 }
a4b92340 146
53a80697
MD
147 if (!data || !len) {
148 ret = 0;
149 goto end;
150 }
151
152 ret = lttcomm_send_unix_sock(sessiond_socket, data, len);
2f70b271
DG
153 if (ret < 0) {
154 ret = -LTTNG_ERR_FATAL;
155 }
53a80697
MD
156
157end:
158 return ret;
159}
160
a04d53fc
FD
161/*
162 * Send file descriptors to the session daemon.
163 *
164 * On success, returns the number of bytes sent (>=0)
165 * On error, returns -1
166 */
167static int send_session_fds(const int *fds, size_t nb_fd)
168{
169 int ret;
170
171 if (!connected) {
172 ret = -LTTNG_ERR_NO_SESSIOND;
173 goto end;
174 }
175
176 if (!fds || !nb_fd) {
177 ret = 0;
178 goto end;
179 }
180
181 ret = lttcomm_send_fds_unix_sock(sessiond_socket, fds, nb_fd);
182 if (ret < 0) {
183 ret = -LTTNG_ERR_FATAL;
184 }
185
186end:
187 return ret;
188}
189
e065084a 190/*
cd80958d 191 * Receive data from the sessiond socket.
e065084a 192 *
1c8d13c8 193 * On success, returns the number of bytes received (>=0)
e368fb43 194 * On error, returns a negative lttng_error_code.
e065084a 195 */
ca95a216 196static int recv_data_sessiond(void *buf, size_t len)
e065084a
DG
197{
198 int ret;
199
bacc41cc
FD
200 assert(len > 0);
201
e065084a 202 if (!connected) {
2f70b271 203 ret = -LTTNG_ERR_NO_SESSIOND;
e065084a 204 goto end;
fac6795d
DG
205 }
206
ca95a216 207 ret = lttcomm_recv_unix_sock(sessiond_socket, buf, len);
2f70b271
DG
208 if (ret < 0) {
209 ret = -LTTNG_ERR_FATAL;
bacc41cc
FD
210 } else if (ret == 0) {
211 ret = -LTTNG_ERR_NO_SESSIOND;
2f70b271 212 }
fac6795d 213
e065084a 214end:
fac6795d
DG
215 return ret;
216}
217
e368fb43
JG
218/*
219 * Receive a payload from the session daemon by appending to an existing
220 * payload.
221 * On success, returns the number of bytes received (>=0)
222 * On error, returns a negative lttng_error_code.
223 */
224static int recv_payload_sessiond(struct lttng_payload *payload, size_t len)
225{
226 int ret;
227 const size_t original_payload_size = payload->buffer.size;
228
229 ret = lttng_dynamic_buffer_set_size(
230 &payload->buffer, payload->buffer.size + len);
231 if (ret) {
232 ret = -LTTNG_ERR_NOMEM;
233 goto end;
234 }
235
236 ret = recv_data_sessiond(
237 payload->buffer.data + original_payload_size, len);
238end:
239 return ret;
240}
241
fac6795d 242/*
9ae110e2 243 * Check if we are in the specified group.
65beb5ff 244 *
9ae110e2 245 * If yes return 1, else return -1.
947308c4 246 */
6c71277b
MD
247LTTNG_HIDDEN
248int lttng_check_tracing_group(void)
947308c4 249{
28ab59d0 250 gid_t *grp_list, tracing_gid;
947308c4
DG
251 int grp_list_size, grp_id, i;
252 int ret = -1;
6c71277b 253 const char *grp_name = tracing_group;
947308c4
DG
254
255 /* Get GID of group 'tracing' */
28ab59d0 256 if (utils_get_group_id(grp_name, false, &tracing_gid)) {
b4d8603b 257 /* If grp_tracing is NULL, the group does not exist. */
947308c4
DG
258 goto end;
259 }
260
261 /* Get number of supplementary group IDs */
262 grp_list_size = getgroups(0, NULL);
263 if (grp_list_size < 0) {
6f04ed72 264 PERROR("getgroups");
947308c4
DG
265 goto end;
266 }
267
268 /* Alloc group list of the right size */
3f451dc0 269 grp_list = zmalloc(grp_list_size * sizeof(gid_t));
00795392 270 if (!grp_list) {
6f04ed72 271 PERROR("malloc");
00795392
MD
272 goto end;
273 }
947308c4 274 grp_id = getgroups(grp_list_size, grp_list);
1c8d13c8 275 if (grp_id < 0) {
6f04ed72 276 PERROR("getgroups");
947308c4
DG
277 goto free_list;
278 }
279
280 for (i = 0; i < grp_list_size; i++) {
28ab59d0 281 if (grp_list[i] == tracing_gid) {
2269e89e 282 ret = 1;
947308c4
DG
283 break;
284 }
285 }
286
287free_list:
288 free(grp_list);
289
290end:
291 return ret;
292}
293
09b72f7a
FD
294static int check_enough_available_memory(size_t num_bytes_requested_per_cpu)
295{
296 int ret;
297 long num_cpu;
298 size_t best_mem_info;
299 size_t num_bytes_requested_total;
300
301 /*
302 * Get the number of CPU currently online to compute the amount of
303 * memory needed to create a buffer for every CPU.
304 */
305 num_cpu = sysconf(_SC_NPROCESSORS_ONLN);
306 if (num_cpu == -1) {
307 goto error;
308 }
309
310 num_bytes_requested_total = num_bytes_requested_per_cpu * num_cpu;
311
312 /*
313 * Try to get the `MemAvail` field of `/proc/meminfo`. This is the most
314 * reliable estimate we can get but it is only exposed by the kernel
315 * since 3.14. (See Linux kernel commit:
316 * 34e431b0ae398fc54ea69ff85ec700722c9da773)
317 */
318 ret = utils_get_memory_available(&best_mem_info);
319 if (ret >= 0) {
320 goto success;
321 }
322
323 /*
324 * As a backup plan, use `MemTotal` field of `/proc/meminfo`. This
325 * is a sanity check for obvious user error.
326 */
327 ret = utils_get_memory_total(&best_mem_info);
328 if (ret >= 0) {
329 goto success;
330 }
331
332error:
333 return -1;
334success:
335 return best_mem_info >= num_bytes_requested_total;
336}
337
947308c4 338/*
2269e89e
DG
339 * Try connect to session daemon with sock_path.
340 *
341 * Return 0 on success, else -1
342 */
343static int try_connect_sessiond(const char *sock_path)
344{
345 int ret;
346
347 /* If socket exist, we check if the daemon listens for connect. */
348 ret = access(sock_path, F_OK);
349 if (ret < 0) {
350 /* Not alive */
2f70b271 351 goto error;
2269e89e
DG
352 }
353
354 ret = lttcomm_connect_unix_sock(sock_path);
355 if (ret < 0) {
9ae110e2 356 /* Not alive. */
2f70b271 357 goto error;
2269e89e
DG
358 }
359
360 ret = lttcomm_close_unix_sock(ret);
361 if (ret < 0) {
6f04ed72 362 PERROR("lttcomm_close_unix_sock");
2269e89e
DG
363 }
364
365 return 0;
2f70b271
DG
366
367error:
368 return -1;
2269e89e
DG
369}
370
371/*
2f70b271
DG
372 * Set sessiond socket path by putting it in the global sessiond_sock_path
373 * variable.
374 *
375 * Returns 0 on success, negative value on failure (the sessiond socket path
376 * is somehow too long or ENOMEM).
947308c4
DG
377 */
378static int set_session_daemon_path(void)
379{
9ae110e2 380 int in_tgroup = 0; /* In tracing group. */
2269e89e
DG
381 uid_t uid;
382
383 uid = getuid();
947308c4 384
2269e89e
DG
385 if (uid != 0) {
386 /* Are we in the tracing group ? */
6c71277b 387 in_tgroup = lttng_check_tracing_group();
2269e89e
DG
388 }
389
08a9c49f 390 if ((uid == 0) || in_tgroup) {
e1b624d0
JG
391 const int ret = lttng_strncpy(sessiond_sock_path,
392 DEFAULT_GLOBAL_CLIENT_UNIX_SOCK,
393 sizeof(sessiond_sock_path));
394
395 if (ret) {
396 goto error;
397 }
08a9c49f 398 }
2269e89e 399
08a9c49f 400 if (uid != 0) {
c617c0c6
MD
401 int ret;
402
08a9c49f 403 if (in_tgroup) {
9ae110e2 404 /* Tracing group. */
08a9c49f
TD
405 ret = try_connect_sessiond(sessiond_sock_path);
406 if (ret >= 0) {
407 goto end;
2269e89e 408 }
08a9c49f 409 /* Global session daemon not available... */
2269e89e 410 }
08a9c49f
TD
411 /* ...or not in tracing group (and not root), default */
412
413 /*
9ae110e2
JG
414 * With GNU C < 2.1, snprintf returns -1 if the target buffer
415 * is too small;
416 * With GNU C >= 2.1, snprintf returns the required size
417 * (excluding closing null)
08a9c49f
TD
418 */
419 ret = snprintf(sessiond_sock_path, sizeof(sessiond_sock_path),
feb0f3e5 420 DEFAULT_HOME_CLIENT_UNIX_SOCK, utils_get_home_dir());
08a9c49f 421 if ((ret < 0) || (ret >= sizeof(sessiond_sock_path))) {
2f70b271 422 goto error;
947308c4 423 }
947308c4 424 }
08a9c49f 425end:
947308c4 426 return 0;
2f70b271
DG
427
428error:
429 return -1;
947308c4
DG
430}
431
65beb5ff 432/*
9ae110e2 433 * Connect to the LTTng session daemon.
65beb5ff 434 *
3e3665b8 435 * On success, return the socket's file descriptor. On error, return -1.
65beb5ff 436 */
3e3665b8 437LTTNG_HIDDEN int connect_sessiond(void)
65beb5ff
DG
438{
439 int ret;
440
441 ret = set_session_daemon_path();
442 if (ret < 0) {
2f70b271 443 goto error;
65beb5ff
DG
444 }
445
9ae110e2 446 /* Connect to the sesssion daemon. */
65beb5ff
DG
447 ret = lttcomm_connect_unix_sock(sessiond_sock_path);
448 if (ret < 0) {
2f70b271 449 goto error;
65beb5ff
DG
450 }
451
3e3665b8 452 return ret;
2f70b271
DG
453
454error:
455 return -1;
65beb5ff
DG
456}
457
3e3665b8
JG
458static void reset_global_sessiond_connection_state(void)
459{
460 sessiond_socket = -1;
461 connected = 0;
462}
463
65beb5ff 464/*
1c8d13c8 465 * Clean disconnect from the session daemon.
9ae110e2 466 *
1c8d13c8 467 * On success, return 0. On error, return -1.
65beb5ff
DG
468 */
469static int disconnect_sessiond(void)
470{
471 int ret = 0;
472
473 if (connected) {
474 ret = lttcomm_close_unix_sock(sessiond_socket);
3e3665b8 475 reset_global_sessiond_connection_state();
65beb5ff
DG
476 }
477
478 return ret;
479}
480
795a978d
PP
481static int recv_sessiond_optional_data(size_t len, void **user_buf,
482 size_t *user_len)
483{
484 int ret = 0;
485 void *buf = NULL;
486
487 if (len) {
488 if (!user_len) {
489 ret = -LTTNG_ERR_INVALID;
490 goto end;
491 }
492
493 buf = zmalloc(len);
494 if (!buf) {
495 ret = -ENOMEM;
496 goto end;
497 }
498
499 ret = recv_data_sessiond(buf, len);
500 if (ret < 0) {
501 goto end;
502 }
503
504 if (!user_buf) {
505 ret = -LTTNG_ERR_INVALID;
506 goto end;
507 }
508
509 /* Move ownership of command header buffer to user. */
510 *user_buf = buf;
511 buf = NULL;
512 *user_len = len;
513 } else {
514 /* No command header. */
515 if (user_len) {
516 *user_len = 0;
517 }
518
519 if (user_buf) {
520 *user_buf = NULL;
521 }
522 }
523
524end:
525 free(buf);
526 return ret;
527}
528
35a6fdb7 529/*
cd80958d 530 * Ask the session daemon a specific command and put the data into buf.
a04d53fc
FD
531 * Takes extra var. len. data and file descriptors as input to send to the
532 * session daemon.
65beb5ff 533 *
af87c45a 534 * Return size of data (only payload, not header) or a negative error code.
65beb5ff 535 */
cac3069d 536LTTNG_HIDDEN
a04d53fc
FD
537int lttng_ctl_ask_sessiond_fds_varlen(struct lttcomm_session_msg *lsm,
538 const int *fds, size_t nb_fd, const void *vardata,
539 size_t vardata_len, void **user_payload_buf,
540 void **user_cmd_header_buf, size_t *user_cmd_header_len)
65beb5ff
DG
541{
542 int ret;
795a978d 543 size_t payload_len;
cd80958d 544 struct lttcomm_lttng_msg llm;
65beb5ff
DG
545
546 ret = connect_sessiond();
547 if (ret < 0) {
2f70b271 548 ret = -LTTNG_ERR_NO_SESSIOND;
65beb5ff 549 goto end;
3e3665b8
JG
550 } else {
551 sessiond_socket = ret;
552 connected = 1;
65beb5ff
DG
553 }
554
cd80958d 555 ret = send_session_msg(lsm);
65beb5ff 556 if (ret < 0) {
2f70b271 557 /* Ret value is a valid lttng error code. */
65beb5ff
DG
558 goto end;
559 }
53a80697 560 /* Send var len data */
795a978d 561 ret = send_session_varlen(vardata, vardata_len);
53a80697 562 if (ret < 0) {
2f70b271 563 /* Ret value is a valid lttng error code. */
53a80697
MD
564 goto end;
565 }
65beb5ff 566
a04d53fc
FD
567 /* Send fds */
568 ret = send_session_fds(fds, nb_fd);
569 if (ret < 0) {
570 /* Ret value is a valid lttng error code. */
571 goto end;
572 }
573
65beb5ff
DG
574 /* Get header from data transmission */
575 ret = recv_data_sessiond(&llm, sizeof(llm));
576 if (ret < 0) {
2f70b271 577 /* Ret value is a valid lttng error code. */
65beb5ff
DG
578 goto end;
579 }
580
581 /* Check error code if OK */
f73fabfd 582 if (llm.ret_code != LTTNG_OK) {
65beb5ff
DG
583 ret = -llm.ret_code;
584 goto end;
585 }
586
795a978d
PP
587 /* Get command header from data transmission */
588 ret = recv_sessiond_optional_data(llm.cmd_header_size,
589 user_cmd_header_buf, user_cmd_header_len);
65beb5ff 590 if (ret < 0) {
65beb5ff
DG
591 goto end;
592 }
593
795a978d
PP
594 /* Get payload from data transmission */
595 ret = recv_sessiond_optional_data(llm.data_size, user_payload_buf,
596 &payload_len);
597 if (ret < 0) {
83009e5e
DG
598 goto end;
599 }
600
795a978d 601 ret = llm.data_size;
65beb5ff
DG
602
603end:
604 disconnect_sessiond();
605 return ret;
606}
607
e368fb43
JG
608LTTNG_HIDDEN
609int lttng_ctl_ask_sessiond_payload(struct lttng_payload_view *message,
610 struct lttng_payload *reply)
611{
612 int ret;
613 struct lttcomm_lttng_msg llm;
fe489250 614 const int fd_count = lttng_payload_view_get_fd_handle_count(message);
e368fb43
JG
615
616 assert(reply->buffer.size == 0);
fe489250 617 assert(lttng_dynamic_pointer_array_get_count(&reply->_fd_handles) == 0);
e368fb43
JG
618
619 ret = connect_sessiond();
620 if (ret < 0) {
621 ret = -LTTNG_ERR_NO_SESSIOND;
622 goto end;
623 } else {
624 sessiond_socket = ret;
625 connected = 1;
626 }
627
628 /* Send command to session daemon */
629 ret = lttcomm_send_creds_unix_sock(sessiond_socket, message->buffer.data,
630 message->buffer.size);
631 if (ret < 0) {
632 ret = -LTTNG_ERR_FATAL;
633 goto end;
634 }
635
fe489250
JG
636 if (fd_count > 0) {
637 ret = lttcomm_send_payload_view_fds_unix_sock(sessiond_socket,
638 message);
639 if (ret < 0) {
640 ret = -LTTNG_ERR_FATAL;
641 goto end;
642 }
e368fb43
JG
643 }
644
645 /* Get header from data transmission */
646 ret = recv_payload_sessiond(reply, sizeof(llm));
647 if (ret < 0) {
648 /* Ret value is a valid lttng error code. */
649 goto end;
650 }
651
652 llm = *((typeof(llm) *) reply->buffer.data);
653
654 /* Check error code if OK */
655 if (llm.ret_code != LTTNG_OK) {
656 ret = -llm.ret_code;
657 goto end;
658 }
659
660 if (llm.cmd_header_size > 0) {
661 ret = recv_payload_sessiond(reply, llm.cmd_header_size);
662 if (ret < 0) {
663 goto end;
664 }
665 }
666
667 /* Get command header from data transmission */
668 if (llm.data_size > 0) {
669 ret = recv_payload_sessiond(reply, llm.data_size);
670 if (ret < 0) {
671 goto end;
672 }
673 }
674
675 if (llm.fd_count > 0) {
fe489250
JG
676 ret = lttcomm_recv_payload_fds_unix_sock(
677 sessiond_socket, llm.fd_count, reply);
678 if (ret < 0) {
e368fb43
JG
679 goto end;
680 }
681 }
682
683 /* Don't return the llm header to the caller. */
684 memmove(reply->buffer.data, reply->buffer.data + sizeof(llm),
685 reply->buffer.size - sizeof(llm));
686 ret = lttng_dynamic_buffer_set_size(
687 &reply->buffer, reply->buffer.size - sizeof(llm));
688 if (ret) {
689 /* Can't happen as size is reduced. */
690 abort();
691 }
692
693 ret = reply->buffer.size;
694
695end:
696 disconnect_sessiond();
697 return ret;
698}
699
9f19cc17 700/*
cd80958d 701 * Create lttng handle and return pointer.
9ae110e2 702 *
1c8d13c8 703 * The returned pointer will be NULL in case of malloc() error.
9f19cc17 704 */
cd80958d
DG
705struct lttng_handle *lttng_create_handle(const char *session_name,
706 struct lttng_domain *domain)
9f19cc17 707{
e1b624d0 708 int ret;
2f70b271
DG
709 struct lttng_handle *handle = NULL;
710
3f451dc0 711 handle = zmalloc(sizeof(struct lttng_handle));
cd80958d 712 if (handle == NULL) {
2f70b271 713 PERROR("malloc handle");
cd80958d
DG
714 goto end;
715 }
716
717 /* Copy session name */
e1b624d0
JG
718 ret = lttng_strncpy(handle->session_name, session_name ? : "",
719 sizeof(handle->session_name));
720 if (ret) {
721 goto error;
722 }
cd80958d 723
95681498
JG
724 /* Copy lttng domain or leave initialized to 0. */
725 if (domain) {
726 lttng_ctl_copy_lttng_domain(&handle->domain, domain);
727 }
cd80958d
DG
728
729end:
730 return handle;
e1b624d0
JG
731error:
732 free(handle);
733 return NULL;
cd80958d
DG
734}
735
736/*
737 * Destroy handle by free(3) the pointer.
738 */
739void lttng_destroy_handle(struct lttng_handle *handle)
740{
0e428499 741 free(handle);
eb354453
DG
742}
743
d9800920
DG
744/*
745 * Register an outside consumer.
9ae110e2 746 *
1c8d13c8 747 * Returns size of returned session payload data or a negative error code.
d9800920
DG
748 */
749int lttng_register_consumer(struct lttng_handle *handle,
750 const char *socket_path)
751{
e1b624d0 752 int ret;
d9800920
DG
753 struct lttcomm_session_msg lsm;
754
2f70b271 755 if (handle == NULL || socket_path == NULL) {
e1b624d0
JG
756 ret = -LTTNG_ERR_INVALID;
757 goto end;
2f70b271
DG
758 }
759
53efb85a 760 memset(&lsm, 0, sizeof(lsm));
d9800920 761 lsm.cmd_type = LTTNG_REGISTER_CONSUMER;
e1b624d0 762 ret = lttng_strncpy(lsm.session.name, handle->session_name,
d9800920 763 sizeof(lsm.session.name));
e1b624d0
JG
764 if (ret) {
765 ret = -LTTNG_ERR_INVALID;
766 goto end;
767 }
768
60160d2a 769 COPY_DOMAIN_PACKED(lsm.domain, handle->domain);
d9800920 770
e1b624d0
JG
771 ret = lttng_strncpy(lsm.u.reg.path, socket_path,
772 sizeof(lsm.u.reg.path));
773 if (ret) {
774 ret = -LTTNG_ERR_INVALID;
775 goto end;
776 }
d9800920 777
e1b624d0
JG
778 ret = lttng_ctl_ask_sessiond(&lsm, NULL);
779end:
780 return ret;
d9800920
DG
781}
782
1df4dedd 783/*
9ae110e2
JG
784 * Start tracing for all traces of the session.
785 *
786 * Returns size of returned session payload data or a negative error code.
1df4dedd 787 */
6a4f824d 788int lttng_start_tracing(const char *session_name)
f3ed775e 789{
e1b624d0 790 int ret;
cd80958d
DG
791 struct lttcomm_session_msg lsm;
792
6a4f824d 793 if (session_name == NULL) {
e1b624d0
JG
794 ret = -LTTNG_ERR_INVALID;
795 goto end;
cd80958d
DG
796 }
797
53efb85a 798 memset(&lsm, 0, sizeof(lsm));
cd80958d 799 lsm.cmd_type = LTTNG_START_TRACE;
6a4f824d 800
e1b624d0
JG
801 ret = lttng_strncpy(lsm.session.name, session_name,
802 sizeof(lsm.session.name));
803 if (ret) {
804 ret = -LTTNG_ERR_INVALID;
805 goto end;
806 }
cd80958d 807
e1b624d0
JG
808 ret = lttng_ctl_ask_sessiond(&lsm, NULL);
809end:
810 return ret;
f3ed775e 811}
1df4dedd
DG
812
813/*
38ee087f 814 * Stop tracing for all traces of the session.
f3ed775e 815 */
38ee087f 816static int _lttng_stop_tracing(const char *session_name, int wait)
f3ed775e 817{
38ee087f 818 int ret, data_ret;
cd80958d
DG
819 struct lttcomm_session_msg lsm;
820
6a4f824d 821 if (session_name == NULL) {
e1b624d0
JG
822 ret = -LTTNG_ERR_INVALID;
823 goto error;
6a4f824d
DG
824 }
825
53efb85a 826 memset(&lsm, 0, sizeof(lsm));
cd80958d 827 lsm.cmd_type = LTTNG_STOP_TRACE;
6a4f824d 828
e1b624d0
JG
829 ret = lttng_strncpy(lsm.session.name, session_name,
830 sizeof(lsm.session.name));
831 if (ret) {
832 ret = -LTTNG_ERR_INVALID;
833 goto error;
834 }
cd80958d 835
cac3069d 836 ret = lttng_ctl_ask_sessiond(&lsm, NULL);
38ee087f
DG
837 if (ret < 0 && ret != -LTTNG_ERR_TRACE_ALREADY_STOPPED) {
838 goto error;
839 }
840
841 if (!wait) {
842 goto end;
843 }
844
38ee087f
DG
845 /* Check for data availability */
846 do {
6d805429 847 data_ret = lttng_data_pending(session_name);
38ee087f
DG
848 if (data_ret < 0) {
849 /* Return the data available call error. */
850 ret = data_ret;
851 goto error;
852 }
853
854 /*
9ae110e2
JG
855 * Data sleep time before retrying (in usec). Don't sleep if the
856 * call returned value indicates availability.
38ee087f 857 */
6d805429 858 if (data_ret) {
c8f61fd4 859 usleep(DEFAULT_DATA_AVAILABILITY_WAIT_TIME_US);
38ee087f 860 }
6d805429 861 } while (data_ret != 0);
38ee087f 862
38ee087f
DG
863end:
864error:
865 return ret;
866}
867
868/*
869 * Stop tracing and wait for data availability.
870 */
871int lttng_stop_tracing(const char *session_name)
872{
873 return _lttng_stop_tracing(session_name, 1);
874}
875
876/*
877 * Stop tracing but _don't_ wait for data availability.
878 */
879int lttng_stop_tracing_no_wait(const char *session_name)
880{
881 return _lttng_stop_tracing(session_name, 0);
f3ed775e
DG
882}
883
884/*
601d5acf
DG
885 * Add context to a channel.
886 *
887 * If the given channel is NULL, add the contexts to all channels.
888 * The event_name param is ignored.
af87c45a
DG
889 *
890 * Returns the size of the returned payload data or a negative error code.
1df4dedd 891 */
cd80958d 892int lttng_add_context(struct lttng_handle *handle,
38057ed1
DG
893 struct lttng_event_context *ctx, const char *event_name,
894 const char *channel_name)
d65106b1 895{
2001793c
JG
896 int ret;
897 size_t len = 0;
898 char *buf = NULL;
cd80958d
DG
899 struct lttcomm_session_msg lsm;
900
9ae110e2 901 /* Safety check. Both are mandatory. */
9d697d3d 902 if (handle == NULL || ctx == NULL) {
2001793c
JG
903 ret = -LTTNG_ERR_INVALID;
904 goto end;
cd80958d
DG
905 }
906
441c16a7 907 memset(&lsm, 0, sizeof(lsm));
cd80958d
DG
908 lsm.cmd_type = LTTNG_ADD_CONTEXT;
909
85076754 910 /* If no channel name, send empty string. */
e1b624d0
JG
911 ret = lttng_strncpy(lsm.u.context.channel_name, channel_name ?: "",
912 sizeof(lsm.u.context.channel_name));
913 if (ret) {
914 ret = -LTTNG_ERR_INVALID;
915 goto end;
85076754 916 }
cd80958d 917
60160d2a 918 COPY_DOMAIN_PACKED(lsm.domain, handle->domain);
e1b624d0 919 ret = lttng_strncpy(lsm.session.name, handle->session_name,
cd80958d 920 sizeof(lsm.session.name));
e1b624d0
JG
921 if (ret) {
922 ret = -LTTNG_ERR_INVALID;
923 goto end;
924 }
cd80958d 925
2001793c
JG
926 if (ctx->ctx == LTTNG_EVENT_CONTEXT_APP_CONTEXT) {
927 size_t provider_len, ctx_len;
928 const char *provider_name = ctx->u.app_ctx.provider_name;
929 const char *ctx_name = ctx->u.app_ctx.ctx_name;
930
931 if (!provider_name || !ctx_name) {
932 ret = -LTTNG_ERR_INVALID;
933 goto end;
934 }
935
936 provider_len = strlen(provider_name);
937 if (provider_len == 0) {
938 ret = -LTTNG_ERR_INVALID;
939 goto end;
940 }
941 lsm.u.context.provider_name_len = provider_len;
942
943 ctx_len = strlen(ctx_name);
944 if (ctx_len == 0) {
945 ret = -LTTNG_ERR_INVALID;
946 goto end;
947 }
948 lsm.u.context.context_name_len = ctx_len;
949
950 len = provider_len + ctx_len;
951 buf = zmalloc(len);
952 if (!buf) {
953 ret = -LTTNG_ERR_NOMEM;
954 goto end;
955 }
956
957 memcpy(buf, provider_name, provider_len);
958 memcpy(buf + provider_len, ctx_name, ctx_len);
959 }
960 memcpy(&lsm.u.context.ctx, ctx, sizeof(struct lttng_event_context));
46f44e2a
JR
961
962 if (ctx->ctx == LTTNG_EVENT_CONTEXT_APP_CONTEXT) {
963 /*
964 * Don't leak application addresses to the sessiond.
965 * This is only necessary when ctx is for an app ctx otherwise
966 * the values inside the union (type & config) are overwritten.
967 */
968 lsm.u.context.ctx.u.app_ctx.provider_name = NULL;
969 lsm.u.context.ctx.u.app_ctx.ctx_name = NULL;
970 }
2001793c 971
795a978d 972 ret = lttng_ctl_ask_sessiond_varlen_no_cmd_header(&lsm, buf, len, NULL);
2001793c
JG
973end:
974 free(buf);
975 return ret;
d65106b1
DG
976}
977
f3ed775e 978/*
9ae110e2
JG
979 * Enable event(s) for a channel.
980 *
981 * If no event name is specified, all events are enabled.
982 * If no channel name is specified, the default 'channel0' is used.
983 *
984 * Returns size of returned session payload data or a negative error code.
f3ed775e 985 */
cd80958d 986int lttng_enable_event(struct lttng_handle *handle,
38057ed1 987 struct lttng_event *ev, const char *channel_name)
1df4dedd 988{
f8a96544
JI
989 return lttng_enable_event_with_exclusions(handle, ev, channel_name,
990 NULL, 0, NULL);
1df4dedd
DG
991}
992
53a80697 993/*
025faf73 994 * Create or enable an event with a filter expression.
178191b3 995 *
53a80697
MD
996 * Return negative error value on error.
997 * Return size of returned session payload data if OK.
998 */
025faf73 999int lttng_enable_event_with_filter(struct lttng_handle *handle,
178191b3 1000 struct lttng_event *event, const char *channel_name,
53a80697
MD
1001 const char *filter_expression)
1002{
f8a96544
JI
1003 return lttng_enable_event_with_exclusions(handle, event, channel_name,
1004 filter_expression, 0, NULL);
53a80697
MD
1005}
1006
347c5ab5 1007/*
0e115563 1008 * Depending on the event, return a newly allocated agent filter expression or
347c5ab5
DG
1009 * NULL if not applicable.
1010 *
1011 * An event with NO loglevel and the name is * will return NULL.
1012 */
0e115563 1013static char *set_agent_filter(const char *filter, struct lttng_event *ev)
347c5ab5
DG
1014{
1015 int err;
0e115563 1016 char *agent_filter = NULL;
347c5ab5
DG
1017
1018 assert(ev);
1019
1020 /* Don't add filter for the '*' event. */
9f449915 1021 if (strcmp(ev->name, "*") != 0) {
347c5ab5 1022 if (filter) {
0e115563 1023 err = asprintf(&agent_filter, "(%s) && (logger_name == \"%s\")", filter,
347c5ab5
DG
1024 ev->name);
1025 } else {
0e115563 1026 err = asprintf(&agent_filter, "logger_name == \"%s\"", ev->name);
347c5ab5
DG
1027 }
1028 if (err < 0) {
1029 PERROR("asprintf");
6a556f7b 1030 goto error;
347c5ab5
DG
1031 }
1032 }
1033
1034 /* Add loglevel filtering if any for the JUL domain. */
1035 if (ev->loglevel_type != LTTNG_EVENT_LOGLEVEL_ALL) {
b53d4e59 1036 const char *op;
347c5ab5
DG
1037
1038 if (ev->loglevel_type == LTTNG_EVENT_LOGLEVEL_RANGE) {
1039 op = ">=";
1040 } else {
1041 op = "==";
1042 }
1043
0e115563 1044 if (filter || agent_filter) {
6a556f7b
JG
1045 char *new_filter;
1046
fb0edb23 1047 err = asprintf(&new_filter, "(%s) && (int_loglevel %s %d)",
0e115563 1048 agent_filter ? agent_filter : filter, op,
347c5ab5 1049 ev->loglevel);
0e115563
DG
1050 if (agent_filter) {
1051 free(agent_filter);
6a556f7b 1052 }
0e115563 1053 agent_filter = new_filter;
347c5ab5 1054 } else {
0e115563 1055 err = asprintf(&agent_filter, "int_loglevel %s %d", op,
347c5ab5
DG
1056 ev->loglevel);
1057 }
1058 if (err < 0) {
1059 PERROR("asprintf");
6a556f7b 1060 goto error;
347c5ab5
DG
1061 }
1062 }
1063
0e115563 1064 return agent_filter;
6a556f7b 1065error:
0e115563 1066 free(agent_filter);
6a556f7b 1067 return NULL;
347c5ab5
DG
1068}
1069
93deb080
JI
1070/*
1071 * Enable event(s) for a channel, possibly with exclusions and a filter.
1072 * If no event name is specified, all events are enabled.
1073 * If no channel name is specified, the default name is used.
1074 * If filter expression is not NULL, the filter is set for the event.
1075 * If exclusion count is not zero, the exclusions are set for the event.
1076 * Returns size of returned session payload data or a negative error code.
1077 */
1078int lttng_enable_event_with_exclusions(struct lttng_handle *handle,
1079 struct lttng_event *ev, const char *channel_name,
e9efbcd3 1080 const char *original_filter_expression,
93deb080
JI
1081 int exclusion_count, char **exclusion_list)
1082{
1083 struct lttcomm_session_msg lsm;
e368fb43
JG
1084 struct lttng_payload payload;
1085 int ret = 0, i;
137b9942 1086 unsigned int free_filter_expression = 0;
93deb080 1087 struct filter_parser_ctx *ctx = NULL;
ec005ec6 1088
6a0838b7
YL
1089 /*
1090 * We have either a filter or some exclusions, so we need to set up
e368fb43 1091 * a variable-length payload from where to send the data.
6a0838b7 1092 */
e368fb43 1093 lttng_payload_init(&payload);
ec005ec6 1094
e9efbcd3
JG
1095 /*
1096 * Cast as non-const since we may replace the filter expression
1097 * by a dynamically allocated string. Otherwise, the original
1098 * string is not modified.
1099 */
1100 char *filter_expression = (char *) original_filter_expression;
93deb080
JI
1101
1102 if (handle == NULL || ev == NULL) {
137b9942
DG
1103 ret = -LTTNG_ERR_INVALID;
1104 goto error;
93deb080
JI
1105 }
1106
9ae110e2
JG
1107 /*
1108 * Empty filter string will always be rejected by the parser
93deb080
JI
1109 * anyway, so treat this corner-case early to eliminate
1110 * lttng_fmemopen error for 0-byte allocation.
1111 */
1112 if (filter_expression && filter_expression[0] == '\0') {
137b9942
DG
1113 ret = -LTTNG_ERR_INVALID;
1114 goto error;
93deb080
JI
1115 }
1116
1117 memset(&lsm, 0, sizeof(lsm));
1118
1119 /* If no channel name, send empty string. */
e1b624d0
JG
1120 ret = lttng_strncpy(lsm.u.enable.channel_name, channel_name ?: "",
1121 sizeof(lsm.u.enable.channel_name));
1122 if (ret) {
1123 ret = -LTTNG_ERR_INVALID;
1124 goto error;
93deb080
JI
1125 }
1126
18a720cd
MD
1127 lsm.cmd_type = LTTNG_ENABLE_EVENT;
1128 if (ev->name[0] == '\0') {
e1b624d0
JG
1129 /* Enable all events. */
1130 ret = lttng_strncpy(ev->name, "*", sizeof(ev->name));
1131 assert(ret == 0);
6565421f 1132 }
93deb080 1133
60160d2a 1134 COPY_DOMAIN_PACKED(lsm.domain, handle->domain);
93deb080
JI
1135 memcpy(&lsm.u.enable.event, ev, sizeof(lsm.u.enable.event));
1136
e1b624d0 1137 ret = lttng_strncpy(lsm.session.name, handle->session_name,
93deb080 1138 sizeof(lsm.session.name));
e1b624d0
JG
1139 if (ret) {
1140 ret = -LTTNG_ERR_INVALID;
1141 goto error;
1142 }
1143
93deb080
JI
1144 lsm.u.enable.exclusion_count = exclusion_count;
1145 lsm.u.enable.bytecode_len = 0;
1146
9ae110e2 1147 /* Parse filter expression. */
5cdb6027 1148 if (filter_expression != NULL || handle->domain.type == LTTNG_DOMAIN_JUL
0e115563
DG
1149 || handle->domain.type == LTTNG_DOMAIN_LOG4J
1150 || handle->domain.type == LTTNG_DOMAIN_PYTHON) {
5cdb6027 1151 if (handle->domain.type == LTTNG_DOMAIN_JUL ||
0e115563
DG
1152 handle->domain.type == LTTNG_DOMAIN_LOG4J ||
1153 handle->domain.type == LTTNG_DOMAIN_PYTHON) {
1154 char *agent_filter;
64226865 1155
347c5ab5 1156 /* Setup JUL filter if needed. */
0e115563
DG
1157 agent_filter = set_agent_filter(filter_expression, ev);
1158 if (!agent_filter) {
137b9942 1159 if (!filter_expression) {
9ae110e2
JG
1160 /*
1161 * No JUL and no filter, just skip
1162 * everything below.
1163 */
137b9942
DG
1164 goto ask_sessiond;
1165 }
64226865
DG
1166 } else {
1167 /*
9ae110e2
JG
1168 * With an agent filter, the original filter has
1169 * been added to it thus replace the filter
1170 * expression.
64226865 1171 */
0e115563 1172 filter_expression = agent_filter;
e9efbcd3 1173 free_filter_expression = 1;
9b21e6d5 1174 }
9b21e6d5 1175 }
93deb080 1176
e4d2f27a 1177 ret = filter_parser_ctx_create_from_filter_expression(filter_expression, &ctx);
93deb080 1178 if (ret) {
137b9942 1179 goto filter_error;
93deb080 1180 }
e4d2f27a
JR
1181
1182 lsm.u.enable.bytecode_len = sizeof(ctx->bytecode->b)
1183 + bytecode_get_len(&ctx->bytecode->b);
1184 lsm.u.enable.expression_len = strlen(filter_expression) + 1;
6b453b5e
JG
1185 }
1186
e368fb43
JG
1187 ret = lttng_dynamic_buffer_set_capacity(&payload.buffer,
1188 lsm.u.enable.bytecode_len +
1189 lsm.u.enable.expression_len +
1190 LTTNG_SYMBOL_NAME_LEN *
1191 exclusion_count);
15e37663 1192 if (ret) {
6b453b5e 1193 ret = -LTTNG_ERR_EXCLUSION_NOMEM;
7ca1dc6f 1194 goto mem_error;
6b453b5e 1195 }
137b9942 1196
9ae110e2 1197 /* Put exclusion names first in the data. */
15e37663
JG
1198 for (i = 0; i < exclusion_count; i++) {
1199 size_t exclusion_len;
1200
1201 exclusion_len = lttng_strnlen(*(exclusion_list + i),
1202 LTTNG_SYMBOL_NAME_LEN);
1203 if (exclusion_len == LTTNG_SYMBOL_NAME_LEN) {
1204 /* Exclusion is not NULL-terminated. */
1205 ret = -LTTNG_ERR_INVALID;
1206 goto mem_error;
1207 }
1208
e368fb43
JG
1209 ret = lttng_dynamic_buffer_append(&payload.buffer,
1210 *(exclusion_list + i), LTTNG_SYMBOL_NAME_LEN);
15e37663
JG
1211 if (ret) {
1212 goto mem_error;
1213 }
6b453b5e 1214 }
15e37663 1215
9ae110e2 1216 /* Add filter expression next. */
15e37663 1217 if (filter_expression) {
e368fb43 1218 ret = lttng_dynamic_buffer_append(&payload.buffer,
15e37663
JG
1219 filter_expression, lsm.u.enable.expression_len);
1220 if (ret) {
1221 goto mem_error;
1222 }
6b453b5e 1223 }
9ae110e2 1224 /* Add filter bytecode next. */
137b9942 1225 if (ctx && lsm.u.enable.bytecode_len != 0) {
e368fb43 1226 ret = lttng_dynamic_buffer_append(&payload.buffer,
15e37663
JG
1227 &ctx->bytecode->b, lsm.u.enable.bytecode_len);
1228 if (ret) {
1229 goto mem_error;
1230 }
1231 }
1232 if (ev->extended.ptr) {
1233 struct lttng_event_extended *ev_ext =
1234 (struct lttng_event_extended *) ev->extended.ptr;
1235
1236 if (ev_ext->probe_location) {
1237 /*
1238 * lttng_userspace_probe_location_serialize returns the
1239 * number of bytes that was appended to the buffer.
1240 */
1241 ret = lttng_userspace_probe_location_serialize(
e368fb43 1242 ev_ext->probe_location, &payload);
56f0bc67 1243 if (ret < 0) {
15e37663
JG
1244 goto mem_error;
1245 }
1246
15e37663
JG
1247 /*
1248 * Set the size of the userspace probe location element
1249 * of the buffer so that the receiving side knows where
1250 * to split it.
1251 */
1252 lsm.u.enable.userspace_probe_location_len = ret;
1253 }
93deb080
JI
1254 }
1255
e368fb43
JG
1256 {
1257 struct lttng_payload_view view = lttng_payload_view_from_payload(
1258 &payload, 0, -1);
fe489250 1259 int fd_count = lttng_payload_view_get_fd_handle_count(&view);
e368fb43
JG
1260 int fd_to_send;
1261
1262 if (fd_count < 0) {
1263 goto mem_error;
1264 }
1265
1266 assert(fd_count == 0 || fd_count == 1);
1267 if (fd_count == 1) {
fe489250
JG
1268 struct fd_handle *handle =
1269 lttng_payload_view_pop_fd_handle(&view);
1270
1271 if (!handle) {
e368fb43
JG
1272 goto mem_error;
1273 }
1274
fe489250
JG
1275 fd_to_send = fd_handle_get_fd(handle);
1276 fd_handle_put(handle);
e368fb43
JG
1277 }
1278
1279 ret = lttng_ctl_ask_sessiond_fds_varlen(&lsm,
1280 fd_count ? &fd_to_send : NULL, fd_count,
1281 view.buffer.size ? view.buffer.data : NULL,
1282 view.buffer.size, NULL, NULL, 0);
1283 }
93deb080 1284
7ca1dc6f
DG
1285mem_error:
1286 if (filter_expression && ctx) {
93deb080
JI
1287 filter_bytecode_free(ctx);
1288 filter_ir_free(ctx);
1289 filter_parser_ctx_free(ctx);
7ca1dc6f
DG
1290 }
1291filter_error:
1292 if (free_filter_expression) {
1293 /*
9ae110e2
JG
1294 * The filter expression has been replaced and must be freed as
1295 * it is not the original filter expression received as a
1296 * parameter.
7ca1dc6f
DG
1297 */
1298 free(filter_expression);
93deb080 1299 }
137b9942
DG
1300error:
1301 /*
9ae110e2
JG
1302 * Return directly to the caller and don't ask the sessiond since
1303 * something went wrong in the parsing of data above.
137b9942 1304 */
e368fb43 1305 lttng_payload_reset(&payload);
93deb080 1306 return ret;
3e1c9ff7
DG
1307
1308ask_sessiond:
1309 ret = lttng_ctl_ask_sessiond(&lsm, NULL);
1310 return ret;
93deb080
JI
1311}
1312
6e911cad
MD
1313int lttng_disable_event_ext(struct lttng_handle *handle,
1314 struct lttng_event *ev, const char *channel_name,
1315 const char *original_filter_expression)
1df4dedd 1316{
cd80958d 1317 struct lttcomm_session_msg lsm;
6e911cad
MD
1318 char *varlen_data;
1319 int ret = 0;
1320 unsigned int free_filter_expression = 0;
1321 struct filter_parser_ctx *ctx = NULL;
1322 /*
1323 * Cast as non-const since we may replace the filter expression
1324 * by a dynamically allocated string. Otherwise, the original
1325 * string is not modified.
1326 */
1327 char *filter_expression = (char *) original_filter_expression;
1df4dedd 1328
6e911cad
MD
1329 if (handle == NULL || ev == NULL) {
1330 ret = -LTTNG_ERR_INVALID;
1331 goto error;
1332 }
1333
9ae110e2
JG
1334 /*
1335 * Empty filter string will always be rejected by the parser
6e911cad
MD
1336 * anyway, so treat this corner-case early to eliminate
1337 * lttng_fmemopen error for 0-byte allocation.
1338 */
1339 if (filter_expression && filter_expression[0] == '\0') {
1340 ret = -LTTNG_ERR_INVALID;
1341 goto error;
cd80958d
DG
1342 }
1343
441c16a7
MD
1344 memset(&lsm, 0, sizeof(lsm));
1345
85076754 1346 /* If no channel name, send empty string. */
e1b624d0
JG
1347 ret = lttng_strncpy(lsm.u.disable.channel_name, channel_name ?: "",
1348 sizeof(lsm.u.disable.channel_name));
1349 if (ret) {
1350 ret = -LTTNG_ERR_INVALID;
1351 goto error;
eb354453
DG
1352 }
1353
18a720cd 1354 lsm.cmd_type = LTTNG_DISABLE_EVENT;
f3ed775e 1355
60160d2a 1356 COPY_DOMAIN_PACKED(lsm.domain, handle->domain);
6e911cad
MD
1357 memcpy(&lsm.u.disable.event, ev, sizeof(lsm.u.disable.event));
1358
e1b624d0 1359 ret = lttng_strncpy(lsm.session.name, handle->session_name,
cd80958d 1360 sizeof(lsm.session.name));
e1b624d0
JG
1361 if (ret) {
1362 ret = -LTTNG_ERR_INVALID;
1363 goto error;
1364 }
1365
6e911cad 1366 lsm.u.disable.bytecode_len = 0;
cd80958d 1367
6e911cad
MD
1368 /*
1369 * For the JUL domain, a filter is enforced except for the
1370 * disable all event. This is done to avoid having the event in
1371 * all sessions thus filtering by logger name.
1372 */
1373 if (filter_expression == NULL &&
1374 (handle->domain.type != LTTNG_DOMAIN_JUL &&
0e115563
DG
1375 handle->domain.type != LTTNG_DOMAIN_LOG4J &&
1376 handle->domain.type != LTTNG_DOMAIN_PYTHON)) {
6e911cad
MD
1377 goto ask_sessiond;
1378 }
1379
1380 /*
1381 * We have a filter, so we need to set up a variable-length
1382 * memory block from where to send the data.
1383 */
1384
1385 /* Parse filter expression */
1386 if (filter_expression != NULL || handle->domain.type == LTTNG_DOMAIN_JUL
0e115563
DG
1387 || handle->domain.type == LTTNG_DOMAIN_LOG4J
1388 || handle->domain.type == LTTNG_DOMAIN_PYTHON) {
6e911cad 1389 if (handle->domain.type == LTTNG_DOMAIN_JUL ||
0e115563
DG
1390 handle->domain.type == LTTNG_DOMAIN_LOG4J ||
1391 handle->domain.type == LTTNG_DOMAIN_PYTHON) {
1392 char *agent_filter;
6e911cad
MD
1393
1394 /* Setup JUL filter if needed. */
0e115563
DG
1395 agent_filter = set_agent_filter(filter_expression, ev);
1396 if (!agent_filter) {
6e911cad 1397 if (!filter_expression) {
9ae110e2
JG
1398 /*
1399 * No JUL and no filter, just skip
1400 * everything below.
1401 */
6e911cad
MD
1402 goto ask_sessiond;
1403 }
1404 } else {
1405 /*
9ae110e2
JG
1406 * With a JUL filter, the original filter has
1407 * been added to it thus replace the filter
1408 * expression.
6e911cad 1409 */
0e115563 1410 filter_expression = agent_filter;
6e911cad
MD
1411 free_filter_expression = 1;
1412 }
1413 }
1414
e4d2f27a 1415 ret = filter_parser_ctx_create_from_filter_expression(filter_expression, &ctx);
6e911cad
MD
1416 if (ret) {
1417 goto filter_error;
1418 }
e4d2f27a
JR
1419
1420 lsm.u.enable.bytecode_len = sizeof(ctx->bytecode->b)
1421 + bytecode_get_len(&ctx->bytecode->b);
1422 lsm.u.enable.expression_len = strlen(filter_expression) + 1;
6e911cad
MD
1423 }
1424
1425 varlen_data = zmalloc(lsm.u.disable.bytecode_len
1426 + lsm.u.disable.expression_len);
1427 if (!varlen_data) {
1428 ret = -LTTNG_ERR_EXCLUSION_NOMEM;
1429 goto mem_error;
1430 }
1431
9ae110e2 1432 /* Add filter expression. */
6e911cad
MD
1433 if (lsm.u.disable.expression_len != 0) {
1434 memcpy(varlen_data,
1435 filter_expression,
1436 lsm.u.disable.expression_len);
1437 }
9ae110e2 1438 /* Add filter bytecode next. */
6e911cad
MD
1439 if (ctx && lsm.u.disable.bytecode_len != 0) {
1440 memcpy(varlen_data
1441 + lsm.u.disable.expression_len,
1442 &ctx->bytecode->b,
1443 lsm.u.disable.bytecode_len);
1444 }
1445
795a978d 1446 ret = lttng_ctl_ask_sessiond_varlen_no_cmd_header(&lsm, varlen_data,
6e911cad
MD
1447 lsm.u.disable.bytecode_len + lsm.u.disable.expression_len, NULL);
1448 free(varlen_data);
1449
1450mem_error:
1451 if (filter_expression && ctx) {
1452 filter_bytecode_free(ctx);
1453 filter_ir_free(ctx);
1454 filter_parser_ctx_free(ctx);
1455 }
1456filter_error:
1457 if (free_filter_expression) {
1458 /*
9ae110e2
JG
1459 * The filter expression has been replaced and must be freed as
1460 * it is not the original filter expression received as a
1461 * parameter.
6e911cad
MD
1462 */
1463 free(filter_expression);
1464 }
1465error:
1466 /*
9ae110e2
JG
1467 * Return directly to the caller and don't ask the sessiond since
1468 * something went wrong in the parsing of data above.
6e911cad
MD
1469 */
1470 return ret;
1471
1472ask_sessiond:
1473 ret = lttng_ctl_ask_sessiond(&lsm, NULL);
1474 return ret;
1475}
1476
1477/*
9ae110e2
JG
1478 * Disable event(s) of a channel and domain.
1479 * If no event name is specified, all events are disabled.
1480 * If no channel name is specified, the default 'channel0' is used.
1481 * Returns size of returned session payload data or a negative error code.
6e911cad
MD
1482 */
1483int lttng_disable_event(struct lttng_handle *handle, const char *name,
1484 const char *channel_name)
1485{
e1b624d0 1486 int ret;
6e911cad
MD
1487 struct lttng_event ev;
1488
1489 memset(&ev, 0, sizeof(ev));
9b7431cf 1490 ev.loglevel = -1;
6e911cad 1491 ev.type = LTTNG_EVENT_ALL;
e1b624d0
JG
1492 ret = lttng_strncpy(ev.name, name ?: "", sizeof(ev.name));
1493 if (ret) {
1494 ret = -LTTNG_ERR_INVALID;
1495 goto end;
1496 }
1497
1498 ret = lttng_disable_event_ext(handle, &ev, channel_name, NULL);
1499end:
1500 return ret;
1df4dedd
DG
1501}
1502
cf0bcb51
JG
1503struct lttng_channel *lttng_channel_create(struct lttng_domain *domain)
1504{
1505 struct lttng_channel *channel = NULL;
1506 struct lttng_channel_extended *extended = NULL;
1507
1508 if (!domain) {
1509 goto error;
1510 }
1511
1512 /* Validate domain. */
1513 switch (domain->type) {
1514 case LTTNG_DOMAIN_UST:
1515 switch (domain->buf_type) {
1516 case LTTNG_BUFFER_PER_UID:
1517 case LTTNG_BUFFER_PER_PID:
1518 break;
1519 default:
1520 goto error;
1521 }
1522 break;
1523 case LTTNG_DOMAIN_KERNEL:
1524 if (domain->buf_type != LTTNG_BUFFER_GLOBAL) {
1525 goto error;
1526 }
1527 break;
1528 default:
1529 goto error;
1530 }
1531
1532 channel = zmalloc(sizeof(*channel));
1533 if (!channel) {
1534 goto error;
1535 }
1536
1537 extended = zmalloc(sizeof(*extended));
1538 if (!extended) {
1539 goto error;
1540 }
1541
1542 channel->attr.extended.ptr = extended;
1543
1544 lttng_channel_set_default_attr(domain, &channel->attr);
1545 return channel;
1546error:
1547 free(channel);
1548 free(extended);
1549 return NULL;
1550}
1551
1552void lttng_channel_destroy(struct lttng_channel *channel)
1553{
1554 if (!channel) {
1555 return;
1556 }
1557
1558 if (channel->attr.extended.ptr) {
1559 free(channel->attr.extended.ptr);
1560 }
1561 free(channel);
1562}
1563
1df4dedd 1564/*
9ae110e2
JG
1565 * Enable channel per domain
1566 * Returns size of returned session payload data or a negative error code.
a5c5a2bd 1567 */
cd80958d 1568int lttng_enable_channel(struct lttng_handle *handle,
cf0bcb51 1569 struct lttng_channel *in_chan)
a5c5a2bd 1570{
e1b624d0 1571 int ret;
cd80958d 1572 struct lttcomm_session_msg lsm;
09b72f7a 1573 size_t total_buffer_size_needed_per_cpu = 0;
cd80958d 1574
9ae110e2 1575 /* NULL arguments are forbidden. No default values. */
cf0bcb51 1576 if (handle == NULL || in_chan == NULL) {
2f70b271 1577 return -LTTNG_ERR_INVALID;
cd80958d
DG
1578 }
1579
441c16a7 1580 memset(&lsm, 0, sizeof(lsm));
cf0bcb51
JG
1581 memcpy(&lsm.u.channel.chan, in_chan, sizeof(lsm.u.channel.chan));
1582 lsm.u.channel.chan.attr.extended.ptr = NULL;
441c16a7 1583
cf0bcb51
JG
1584 if (!in_chan->attr.extended.ptr) {
1585 struct lttng_channel *channel;
1586 struct lttng_channel_extended *extended;
7d29a247 1587
cf0bcb51
JG
1588 channel = lttng_channel_create(&handle->domain);
1589 if (!channel) {
1590 return -LTTNG_ERR_NOMEM;
1591 }
1592
1593 /*
1594 * Create a new channel in order to use default extended
1595 * attribute values.
1596 */
1597 extended = (struct lttng_channel_extended *)
1598 channel->attr.extended.ptr;
1599 memcpy(&lsm.u.channel.extended, extended, sizeof(*extended));
1600 lttng_channel_destroy(channel);
1601 } else {
1602 struct lttng_channel_extended *extended;
1603
1604 extended = (struct lttng_channel_extended *)
1605 in_chan->attr.extended.ptr;
1606 memcpy(&lsm.u.channel.extended, extended, sizeof(*extended));
1607 }
cd80958d 1608
09b72f7a
FD
1609 /*
1610 * Verify that the amount of memory required to create the requested
1611 * buffer is available on the system at the moment.
1612 */
1613 total_buffer_size_needed_per_cpu = lsm.u.channel.chan.attr.num_subbuf *
1614 lsm.u.channel.chan.attr.subbuf_size;
1615 if (!check_enough_available_memory(total_buffer_size_needed_per_cpu)) {
1616 return -LTTNG_ERR_NOMEM;
1617 }
1618
cf0bcb51 1619 lsm.cmd_type = LTTNG_ENABLE_CHANNEL;
60160d2a 1620 COPY_DOMAIN_PACKED(lsm.domain, handle->domain);
7d29a247 1621
e1b624d0
JG
1622 ret = lttng_strncpy(lsm.session.name, handle->session_name,
1623 sizeof(lsm.session.name));
1624 if (ret) {
1625 ret = -LTTNG_ERR_INVALID;
1626 goto end;
1627 }
cd80958d 1628
e1b624d0
JG
1629 ret = lttng_ctl_ask_sessiond(&lsm, NULL);
1630end:
1631 return ret;
8c0faa1d 1632}
1df4dedd 1633
2ef84c95 1634/*
9ae110e2
JG
1635 * All tracing will be stopped for registered events of the channel.
1636 * Returns size of returned session payload data or a negative error code.
2ef84c95 1637 */
cd80958d 1638int lttng_disable_channel(struct lttng_handle *handle, const char *name)
2ef84c95 1639{
e1b624d0 1640 int ret;
cd80958d
DG
1641 struct lttcomm_session_msg lsm;
1642
9ae110e2 1643 /* Safety check. Both are mandatory. */
9d697d3d 1644 if (handle == NULL || name == NULL) {
2f70b271 1645 return -LTTNG_ERR_INVALID;
cd80958d
DG
1646 }
1647
441c16a7
MD
1648 memset(&lsm, 0, sizeof(lsm));
1649
cd80958d 1650 lsm.cmd_type = LTTNG_DISABLE_CHANNEL;
1df4dedd 1651
e1b624d0 1652 ret = lttng_strncpy(lsm.u.disable.channel_name, name,
9d697d3d 1653 sizeof(lsm.u.disable.channel_name));
e1b624d0
JG
1654 if (ret) {
1655 ret = -LTTNG_ERR_INVALID;
1656 goto end;
1657 }
9d697d3d 1658
60160d2a 1659 COPY_DOMAIN_PACKED(lsm.domain, handle->domain);
cd80958d 1660
e1b624d0
JG
1661 ret = lttng_strncpy(lsm.session.name, handle->session_name,
1662 sizeof(lsm.session.name));
1663 if (ret) {
1664 ret = -LTTNG_ERR_INVALID;
1665 goto end;
1666 }
cd80958d 1667
e1b624d0
JG
1668 ret = lttng_ctl_ask_sessiond(&lsm, NULL);
1669end:
1670 return ret;
ca95a216
DG
1671}
1672
fac6795d 1673/*
9ae110e2
JG
1674 * Lists all available tracepoints of domain.
1675 * Sets the contents of the events array.
1676 * Returns the number of lttng_event entries in events;
1677 * on error, returns a negative value.
fac6795d 1678 */
cd80958d 1679int lttng_list_tracepoints(struct lttng_handle *handle,
2a71efd5 1680 struct lttng_event **events)
fac6795d 1681{
052da939 1682 int ret;
cd80958d
DG
1683 struct lttcomm_session_msg lsm;
1684
9d697d3d 1685 if (handle == NULL) {
2f70b271 1686 return -LTTNG_ERR_INVALID;
cd80958d 1687 }
fac6795d 1688
53efb85a 1689 memset(&lsm, 0, sizeof(lsm));
cd80958d 1690 lsm.cmd_type = LTTNG_LIST_TRACEPOINTS;
60160d2a 1691 COPY_DOMAIN_PACKED(lsm.domain, handle->domain);
2a71efd5 1692
cac3069d 1693 ret = lttng_ctl_ask_sessiond(&lsm, (void **) events);
052da939
DG
1694 if (ret < 0) {
1695 return ret;
eb354453 1696 }
fac6795d 1697
9f19cc17 1698 return ret / sizeof(struct lttng_event);
fac6795d
DG
1699}
1700
f37d259d 1701/*
9ae110e2
JG
1702 * Lists all available tracepoint fields of domain.
1703 * Sets the contents of the event field array.
1704 * Returns the number of lttng_event_field entries in events;
1705 * on error, returns a negative value.
f37d259d
MD
1706 */
1707int lttng_list_tracepoint_fields(struct lttng_handle *handle,
1708 struct lttng_event_field **fields)
1709{
1710 int ret;
1711 struct lttcomm_session_msg lsm;
1712
1713 if (handle == NULL) {
2f70b271 1714 return -LTTNG_ERR_INVALID;
f37d259d
MD
1715 }
1716
53efb85a 1717 memset(&lsm, 0, sizeof(lsm));
f37d259d 1718 lsm.cmd_type = LTTNG_LIST_TRACEPOINT_FIELDS;
60160d2a 1719 COPY_DOMAIN_PACKED(lsm.domain, handle->domain);
f37d259d 1720
cac3069d 1721 ret = lttng_ctl_ask_sessiond(&lsm, (void **) fields);
f37d259d
MD
1722 if (ret < 0) {
1723 return ret;
1724 }
1725
1726 return ret / sizeof(struct lttng_event_field);
1727}
1728
834978fd 1729/*
9ae110e2
JG
1730 * Lists all available kernel system calls. Allocates and sets the contents of
1731 * the events array.
834978fd 1732 *
9ae110e2
JG
1733 * Returns the number of lttng_event entries in events; on error, returns a
1734 * negative value.
834978fd
DG
1735 */
1736int lttng_list_syscalls(struct lttng_event **events)
1737{
1738 int ret;
1739 struct lttcomm_session_msg lsm;
1740
1741 if (!events) {
1742 return -LTTNG_ERR_INVALID;
1743 }
1744
1745 memset(&lsm, 0, sizeof(lsm));
1746 lsm.cmd_type = LTTNG_LIST_SYSCALLS;
1747 /* Force kernel domain for system calls. */
1748 lsm.domain.type = LTTNG_DOMAIN_KERNEL;
1749
1750 ret = lttng_ctl_ask_sessiond(&lsm, (void **) events);
1751 if (ret < 0) {
1752 return ret;
1753 }
1754
1755 return ret / sizeof(struct lttng_event);
1756}
1757
1657e9bb 1758/*
9ae110e2
JG
1759 * Returns a human readable string describing
1760 * the error code (a negative value).
1657e9bb 1761 */
9a745bc7 1762const char *lttng_strerror(int code)
1657e9bb 1763{
f73fabfd 1764 return error_get_str(code);
1657e9bb
DG
1765}
1766
b178f53e
JG
1767enum lttng_error_code lttng_create_session_ext(
1768 struct lttng_session_descriptor *session_descriptor)
1769{
1770 enum lttng_error_code ret_code;
1771 struct lttcomm_session_msg lsm = {
1772 .cmd_type = LTTNG_CREATE_SESSION_EXT,
1773 };
1774 void *reply = NULL;
1775 struct lttng_buffer_view reply_view;
1776 int reply_ret;
1777 bool sessiond_must_generate_ouput;
1778 struct lttng_dynamic_buffer payload;
1779 int ret;
1780 size_t descriptor_size;
1781 struct lttng_session_descriptor *descriptor_reply = NULL;
1782
1783 lttng_dynamic_buffer_init(&payload);
1784 if (!session_descriptor) {
1785 ret_code = LTTNG_ERR_INVALID;
1786 goto end;
1787 }
1788
1789 sessiond_must_generate_ouput =
1790 !lttng_session_descriptor_is_output_destination_initialized(
1791 session_descriptor);
1792 if (sessiond_must_generate_ouput) {
1793 const char *home_dir = utils_get_home_dir();
1794 size_t home_dir_len = home_dir ? strlen(home_dir) + 1 : 0;
1795
1796 if (!home_dir || home_dir_len > LTTNG_PATH_MAX) {
1797 ret_code = LTTNG_ERR_FATAL;
1798 goto end;
1799 }
1800
1801 lsm.u.create_session.home_dir_size = (uint16_t) home_dir_len;
1802 ret = lttng_dynamic_buffer_append(&payload, home_dir,
1803 home_dir_len);
1804 if (ret) {
1805 ret_code = LTTNG_ERR_NOMEM;
1806 goto end;
1807 }
1808 }
1809
1810 descriptor_size = payload.size;
1811 ret = lttng_session_descriptor_serialize(session_descriptor,
1812 &payload);
1813 if (ret) {
1814 ret_code = LTTNG_ERR_INVALID;
1815 goto end;
1816 }
1817 descriptor_size = payload.size - descriptor_size;
1818 lsm.u.create_session.session_descriptor_size = descriptor_size;
1819
1820 /* Command returns a session descriptor on success. */
1821 reply_ret = lttng_ctl_ask_sessiond_varlen_no_cmd_header(&lsm, payload.data,
1822 payload.size, &reply);
1823 if (reply_ret < 0) {
1824 ret_code = -reply_ret;
1825 goto end;
1826 } else if (reply_ret == 0) {
1827 /* Socket unexpectedly closed by the session daemon. */
1828 ret_code = LTTNG_ERR_FATAL;
1829 goto end;
1830 }
1831
1832 reply_view = lttng_buffer_view_init(reply, 0, reply_ret);
1833 ret = lttng_session_descriptor_create_from_buffer(&reply_view,
1834 &descriptor_reply);
1835 if (ret < 0) {
1836 ret_code = LTTNG_ERR_FATAL;
1837 goto end;
1838 }
1839 ret_code = LTTNG_OK;
1840 lttng_session_descriptor_assign(session_descriptor, descriptor_reply);
1841end:
1842 free(reply);
1843 lttng_dynamic_buffer_reset(&payload);
1844 lttng_session_descriptor_destroy(descriptor_reply);
1845 return ret_code;
1846}
1847
aaf97519 1848/*
b178f53e 1849 * Create a new session using name and url for destination.
a4b92340 1850 *
780d4bb8 1851 * Return 0 on success else a negative LTTng error code.
00e2e675 1852 */
a4b92340 1853int lttng_create_session(const char *name, const char *url)
00e2e675 1854{
3dd05a85 1855 int ret;
a4b92340 1856 ssize_t size;
a4b92340 1857 struct lttng_uri *uris = NULL;
b178f53e
JG
1858 struct lttng_session_descriptor *descriptor = NULL;
1859 enum lttng_error_code ret_code;
00e2e675 1860
b178f53e
JG
1861 if (!name) {
1862 ret = -LTTNG_ERR_INVALID;
1863 goto end;
00e2e675
DG
1864 }
1865
bc894455 1866 size = uri_parse_str_urls(url, NULL, &uris);
a4b92340 1867 if (size < 0) {
b178f53e
JG
1868 ret = -LTTNG_ERR_INVALID;
1869 goto end;
1870 }
1871 switch (size) {
1872 case 0:
1873 descriptor = lttng_session_descriptor_create(name);
1874 break;
1875 case 1:
1876 if (uris[0].dtype != LTTNG_DST_PATH) {
1877 ret = -LTTNG_ERR_INVALID;
1878 goto end;
1879 }
1880 descriptor = lttng_session_descriptor_local_create(name,
1881 uris[0].dst.path);
1882 break;
1883 case 2:
1884 descriptor = lttng_session_descriptor_network_create(name, url,
1885 NULL);
1886 break;
1887 default:
1888 ret = -LTTNG_ERR_INVALID;
1889 goto end;
1890 }
1891 if (!descriptor) {
1892 ret = -LTTNG_ERR_INVALID;
1893 goto end;
00e2e675 1894 }
b178f53e
JG
1895 ret_code = lttng_create_session_ext(descriptor);
1896 ret = ret_code == LTTNG_OK ? 0 : -ret_code;
1897end:
1898 lttng_session_descriptor_destroy(descriptor);
1899 free(uris);
1900 return ret;
1901}
00e2e675 1902
b178f53e
JG
1903/*
1904 * Create a session exclusively used for snapshot.
1905 *
780d4bb8 1906 * Return 0 on success else a negative LTTng error code.
b178f53e
JG
1907 */
1908int lttng_create_session_snapshot(const char *name, const char *snapshot_url)
1909{
1910 int ret;
1911 enum lttng_error_code ret_code;
1912 ssize_t size;
1913 struct lttng_uri *uris = NULL;
1914 struct lttng_session_descriptor *descriptor = NULL;
a4b92340 1915
b178f53e
JG
1916 if (!name) {
1917 ret = -LTTNG_ERR_INVALID;
1918 goto end;
1919 }
1920
1921 size = uri_parse_str_urls(snapshot_url, NULL, &uris);
1922 if (size < 0) {
1923 ret = -LTTNG_ERR_INVALID;
1924 goto end;
1925 }
1926 /*
1927 * If the user does not specify a custom subdir, use the session name.
1928 */
1929 if (size > 0 && uris[0].dtype != LTTNG_DST_PATH &&
1930 strlen(uris[0].subdir) == 0) {
1931 ret = snprintf(uris[0].subdir, sizeof(uris[0].subdir), "%s",
1932 name);
1933 if (ret < 0) {
1934 PERROR("Failed to set session name as network destination sub-directory");
1935 ret = -LTTNG_ERR_FATAL;
1936 goto end;
1937 } else if (ret >= sizeof(uris[0].subdir)) {
1938 /* Truncated output. */
1939 ret = -LTTNG_ERR_INVALID;
1940 goto end;
1941 }
1942 }
3dd05a85 1943
b178f53e
JG
1944 switch (size) {
1945 case 0:
1946 descriptor = lttng_session_descriptor_snapshot_create(name);
1947 break;
1948 case 1:
1949 if (uris[0].dtype != LTTNG_DST_PATH) {
1950 ret = -LTTNG_ERR_INVALID;
1951 goto end;
1952 }
1953 descriptor = lttng_session_descriptor_snapshot_local_create(
1954 name,
1955 uris[0].dst.path);
1956 break;
1957 case 2:
1958 descriptor = lttng_session_descriptor_snapshot_network_create(
1959 name,
1960 snapshot_url,
1961 NULL);
1962 break;
1963 default:
1964 ret = -LTTNG_ERR_INVALID;
1965 goto end;
1966 }
1967 if (!descriptor) {
1968 ret = -LTTNG_ERR_INVALID;
1969 goto end;
1970 }
1971 ret_code = lttng_create_session_ext(descriptor);
1972 ret = ret_code == LTTNG_OK ? 0 : -ret_code;
1973end:
1974 lttng_session_descriptor_destroy(descriptor);
3dd05a85
DG
1975 free(uris);
1976 return ret;
00e2e675
DG
1977}
1978
b178f53e
JG
1979/*
1980 * Create a session exclusively used for live.
1981 *
780d4bb8 1982 * Return 0 on success else a negative LTTng error code.
b178f53e
JG
1983 */
1984int lttng_create_session_live(const char *name, const char *url,
1985 unsigned int timer_interval)
1986{
1987 int ret;
1988 enum lttng_error_code ret_code;
1989 struct lttng_session_descriptor *descriptor = NULL;
1990
1991 if (!name) {
1992 ret = -LTTNG_ERR_INVALID;
1993 goto end;
1994 }
1995
1996 if (url) {
1997 descriptor = lttng_session_descriptor_live_network_create(
1998 name, url, NULL, timer_interval);
1999 } else {
2000 descriptor = lttng_session_descriptor_live_create(
2001 name, timer_interval);
2002 }
2003 if (!descriptor) {
2004 ret = -LTTNG_ERR_INVALID;
2005 goto end;
2006 }
2007 ret_code = lttng_create_session_ext(descriptor);
2008 ret = ret_code == LTTNG_OK ? 0 : -ret_code;
2009end:
2010 lttng_session_descriptor_destroy(descriptor);
2011 return ret;
2012}
2013
e20ee7c2
JD
2014/*
2015 * Stop the session and wait for the data before destroying it
780d4bb8
MD
2016 *
2017 * Return 0 on success else a negative LTTng error code.
e20ee7c2
JD
2018 */
2019int lttng_destroy_session(const char *session_name)
2020{
2021 int ret;
3e3665b8
JG
2022 enum lttng_error_code ret_code;
2023 enum lttng_destruction_handle_status status;
2024 struct lttng_destruction_handle *handle = NULL;
e20ee7c2
JD
2025
2026 /*
3e3665b8
JG
2027 * Stop the tracing and wait for the data to be
2028 * consumed.
e20ee7c2
JD
2029 */
2030 ret = _lttng_stop_tracing(session_name, 1);
2031 if (ret && ret != -LTTNG_ERR_TRACE_ALREADY_STOPPED) {
2032 goto end;
2033 }
2034
3e3665b8
JG
2035 ret_code = lttng_destroy_session_ext(session_name, &handle);
2036 if (ret_code != LTTNG_OK) {
2037 ret = (int) -ret_code;
2038 goto end;
2039 }
2040 assert(handle);
2041
2042 /* Block until the completion of the destruction of the session. */
2043 status = lttng_destruction_handle_wait_for_completion(handle, -1);
2044 if (status != LTTNG_DESTRUCTION_HANDLE_STATUS_COMPLETED) {
2045 ret = -LTTNG_ERR_UNK;
2046 goto end;
2047 }
2048
2049 status = lttng_destruction_handle_get_result(handle, &ret_code);
2050 if (status != LTTNG_DESTRUCTION_HANDLE_STATUS_OK) {
2051 ret = -LTTNG_ERR_UNK;
2052 goto end;
2053 }
780d4bb8 2054 ret = ret_code == LTTNG_OK ? 0 : -ret_code;
e20ee7c2 2055end:
3e3665b8 2056 lttng_destruction_handle_destroy(handle);
e20ee7c2
JD
2057 return ret;
2058}
2059
2060/*
2061 * Destroy the session without waiting for the data.
2062 */
2063int lttng_destroy_session_no_wait(const char *session_name)
2064{
3e3665b8 2065 enum lttng_error_code ret_code;
e20ee7c2 2066
3e3665b8
JG
2067 ret_code = lttng_destroy_session_ext(session_name, NULL);
2068 return ret_code == LTTNG_OK ? ret_code : -ret_code;
e20ee7c2
JD
2069}
2070
57167058 2071/*
9ae110e2
JG
2072 * Ask the session daemon for all available sessions.
2073 * Sets the contents of the sessions array.
2074 * Returns the number of lttng_session entries in sessions;
2075 * on error, returns a negative value.
57167058 2076 */
b178f53e 2077int lttng_list_sessions(struct lttng_session **out_sessions)
57167058 2078{
ca95a216 2079 int ret;
cd80958d 2080 struct lttcomm_session_msg lsm;
b178f53e
JG
2081 const size_t session_size = sizeof(struct lttng_session) +
2082 sizeof(struct lttng_session_extended);
2083 size_t session_count, i;
2084 struct lttng_session_extended *sessions_extended_begin;
2085 struct lttng_session *sessions = NULL;
57167058 2086
53efb85a 2087 memset(&lsm, 0, sizeof(lsm));
cd80958d 2088 lsm.cmd_type = LTTNG_LIST_SESSIONS;
b178f53e
JG
2089 ret = lttng_ctl_ask_sessiond(&lsm, (void**) &sessions);
2090 if (ret <= 0) {
b178f53e
JG
2091 goto end;
2092 }
2093 if (!sessions) {
2094 ret = -LTTNG_ERR_FATAL;
2095 goto end;
2096 }
2097
2098 if (ret % session_size) {
2099 ret = -LTTNG_ERR_UNK;
2100 free(sessions);
2101 *out_sessions = NULL;
2102 goto end;
57167058 2103 }
b178f53e
JG
2104 session_count = (size_t) ret / session_size;
2105 sessions_extended_begin = (struct lttng_session_extended *)
2106 (&sessions[session_count]);
57167058 2107
b178f53e
JG
2108 /* Set extended session info pointers. */
2109 for (i = 0; i < session_count; i++) {
2110 struct lttng_session *session = &sessions[i];
2111 struct lttng_session_extended *extended =
2112 &(sessions_extended_begin[i]);
2113
2114 session->extended.ptr = extended;
2115 }
2116
2117 ret = (int) session_count;
2118 *out_sessions = sessions;
2119end:
2120 return ret;
2121}
2122
2123enum lttng_error_code lttng_session_get_creation_time(
2124 const struct lttng_session *session, uint64_t *creation_time)
2125{
2126 enum lttng_error_code ret = LTTNG_OK;
2127 struct lttng_session_extended *extended;
2128
2129 if (!session || !creation_time || !session->extended.ptr) {
2130 ret = LTTNG_ERR_INVALID;
2131 goto end;
2132 }
2133
2134 extended = session->extended.ptr;
2135 if (!extended->creation_time.is_set) {
2136 /* Not created on the session daemon yet. */
2137 ret = LTTNG_ERR_SESSION_NOT_EXIST;
2138 goto end;
2139 }
2140 *creation_time = extended->creation_time.value;
2141end:
2142 return ret;
57167058
DG
2143}
2144
d7ba1388
MD
2145int lttng_set_session_shm_path(const char *session_name,
2146 const char *shm_path)
2147{
e1b624d0 2148 int ret;
d7ba1388
MD
2149 struct lttcomm_session_msg lsm;
2150
2151 if (session_name == NULL) {
2152 return -LTTNG_ERR_INVALID;
2153 }
2154
2155 memset(&lsm, 0, sizeof(lsm));
2156 lsm.cmd_type = LTTNG_SET_SESSION_SHM_PATH;
2157
e1b624d0 2158 ret = lttng_strncpy(lsm.session.name, session_name,
d7ba1388 2159 sizeof(lsm.session.name));
e1b624d0
JG
2160 if (ret) {
2161 ret = -LTTNG_ERR_INVALID;
2162 goto end;
2163 }
2164
2165 ret = lttng_strncpy(lsm.u.set_shm_path.shm_path, shm_path ?: "",
d7ba1388 2166 sizeof(lsm.u.set_shm_path.shm_path));
e1b624d0
JG
2167 if (ret) {
2168 ret = -LTTNG_ERR_INVALID;
2169 goto end;
2170 }
d7ba1388 2171
e1b624d0
JG
2172 ret = lttng_ctl_ask_sessiond(&lsm, NULL);
2173end:
2174 return ret;
d7ba1388
MD
2175}
2176
9f19cc17 2177/*
9ae110e2
JG
2178 * Ask the session daemon for all available domains of a session.
2179 * Sets the contents of the domains array.
2180 * Returns the number of lttng_domain entries in domains;
2181 * on error, returns a negative value.
9f19cc17 2182 */
330be774 2183int lttng_list_domains(const char *session_name,
cd80958d 2184 struct lttng_domain **domains)
9f19cc17
DG
2185{
2186 int ret;
cd80958d
DG
2187 struct lttcomm_session_msg lsm;
2188
330be774 2189 if (session_name == NULL) {
e1b624d0
JG
2190 ret = -LTTNG_ERR_INVALID;
2191 goto error;
cd80958d 2192 }
9f19cc17 2193
53efb85a 2194 memset(&lsm, 0, sizeof(lsm));
cd80958d
DG
2195 lsm.cmd_type = LTTNG_LIST_DOMAINS;
2196
e1b624d0 2197 ret = lttng_strncpy(lsm.session.name, session_name,
cac3069d 2198 sizeof(lsm.session.name));
e1b624d0
JG
2199 if (ret) {
2200 ret = -LTTNG_ERR_INVALID;
2201 goto error;
2202 }
cd80958d 2203
cac3069d 2204 ret = lttng_ctl_ask_sessiond(&lsm, (void**) domains);
9f19cc17 2205 if (ret < 0) {
e1b624d0 2206 goto error;
9f19cc17
DG
2207 }
2208
2209 return ret / sizeof(struct lttng_domain);
e1b624d0
JG
2210error:
2211 return ret;
9f19cc17
DG
2212}
2213
2214/*
9ae110e2
JG
2215 * Ask the session daemon for all available channels of a session.
2216 * Sets the contents of the channels array.
2217 * Returns the number of lttng_channel entries in channels;
2218 * on error, returns a negative value.
9f19cc17 2219 */
cd80958d
DG
2220int lttng_list_channels(struct lttng_handle *handle,
2221 struct lttng_channel **channels)
9f19cc17
DG
2222{
2223 int ret;
53e367f9
JG
2224 size_t channel_count, i;
2225 const size_t channel_size = sizeof(struct lttng_channel) +
cf0bcb51 2226 sizeof(struct lttng_channel_extended);
cd80958d 2227 struct lttcomm_session_msg lsm;
53e367f9 2228 void *extended_at;
cd80958d 2229
9d697d3d 2230 if (handle == NULL) {
53e367f9
JG
2231 ret = -LTTNG_ERR_INVALID;
2232 goto end;
cd80958d
DG
2233 }
2234
53efb85a 2235 memset(&lsm, 0, sizeof(lsm));
cd80958d 2236 lsm.cmd_type = LTTNG_LIST_CHANNELS;
e1b624d0 2237 ret = lttng_strncpy(lsm.session.name, handle->session_name,
cd80958d 2238 sizeof(lsm.session.name));
e1b624d0
JG
2239 if (ret) {
2240 ret = -LTTNG_ERR_INVALID;
2241 goto end;
2242 }
9f19cc17 2243
60160d2a 2244 COPY_DOMAIN_PACKED(lsm.domain, handle->domain);
9f19cc17 2245
cac3069d 2246 ret = lttng_ctl_ask_sessiond(&lsm, (void**) channels);
9f19cc17 2247 if (ret < 0) {
53e367f9
JG
2248 goto end;
2249 }
2250
2251 if (ret % channel_size) {
2252 ret = -LTTNG_ERR_UNK;
2253 free(*channels);
2254 *channels = NULL;
2255 goto end;
9f19cc17 2256 }
53e367f9 2257 channel_count = (size_t) ret / channel_size;
9f19cc17 2258
53e367f9
JG
2259 /* Set extended info pointers */
2260 extended_at = ((void *) *channels) +
2261 channel_count * sizeof(struct lttng_channel);
2262 for (i = 0; i < channel_count; i++) {
2263 struct lttng_channel *chan = &(*channels)[i];
2264
2265 chan->attr.extended.ptr = extended_at;
cf0bcb51 2266 extended_at += sizeof(struct lttng_channel_extended);
53e367f9
JG
2267 }
2268
2269 ret = (int) channel_count;
2270end:
2271 return ret;
9f19cc17
DG
2272}
2273
2274/*
9ae110e2
JG
2275 * Ask the session daemon for all available events of a session channel.
2276 * Sets the contents of the events array.
2277 * Returns the number of lttng_event entries in events;
2278 * on error, returns a negative value.
9f19cc17 2279 */
cd80958d
DG
2280int lttng_list_events(struct lttng_handle *handle,
2281 const char *channel_name, struct lttng_event **events)
9f19cc17
DG
2282{
2283 int ret;
e368fb43
JG
2284 struct lttcomm_session_msg lsm = {};
2285 const struct lttcomm_event_command_header *cmd_header = NULL;
b4e3ceb9 2286 uint32_t nb_events, i;
e368fb43 2287 const void *comm_ext_at;
56f0bc67 2288 struct lttng_dynamic_buffer listing;
de453daa 2289 size_t storage_req;
e368fb43
JG
2290 struct lttng_payload payload;
2291 struct lttng_payload payload_copy;
2292 struct lttng_payload_view lsm_view =
2293 lttng_payload_view_init_from_buffer(
2294 (const char *) &lsm, 0, sizeof(lsm));
2295 struct lttng_buffer_view cmd_header_view;
2296 struct lttng_buffer_view cmd_payload_view;
2297 struct lttng_buffer_view flat_events_view;
2298 struct lttng_buffer_view ext_view;
9f19cc17 2299
9d697d3d
DG
2300 /* Safety check. An handle and channel name are mandatory */
2301 if (handle == NULL || channel_name == NULL) {
e368fb43
JG
2302 ret = -LTTNG_ERR_INVALID;
2303 goto end;
cd80958d
DG
2304 }
2305
e368fb43
JG
2306 lttng_payload_init(&payload);
2307 lttng_payload_init(&payload_copy);
2308
cd80958d 2309 lsm.cmd_type = LTTNG_LIST_EVENTS;
e1b624d0 2310 ret = lttng_strncpy(lsm.session.name, handle->session_name,
cd80958d 2311 sizeof(lsm.session.name));
e1b624d0
JG
2312 if (ret) {
2313 ret = -LTTNG_ERR_INVALID;
2314 goto end;
2315 }
2316
2317 ret = lttng_strncpy(lsm.u.list.channel_name, channel_name,
cd80958d 2318 sizeof(lsm.u.list.channel_name));
e1b624d0
JG
2319 if (ret) {
2320 ret = -LTTNG_ERR_INVALID;
2321 goto end;
2322 }
2323
60160d2a 2324 COPY_DOMAIN_PACKED(lsm.domain, handle->domain);
9f19cc17 2325
e368fb43 2326 ret = lttng_ctl_ask_sessiond_payload(&lsm_view, &payload);
9f19cc17 2327 if (ret < 0) {
de453daa 2328 goto end;
9f19cc17
DG
2329 }
2330
e368fb43
JG
2331 /*
2332 * A copy of the payload is performed since it will be
2333 * consumed twice. Consuming the same payload twice is invalid since
2334 * it will cause any received file descriptor to become "shared"
2335 * between different instances of the resulting objects.
2336 */
2337 ret = lttng_payload_copy(&payload, &payload_copy);
2338 if (ret) {
2339 ret = -LTTNG_ERR_NOMEM;
2340 goto end;
2341 }
2342
2343 cmd_header_view = lttng_buffer_view_from_dynamic_buffer(
2344 &payload.buffer, 0, sizeof(*cmd_header));
3e6e0df2 2345 if (!lttng_buffer_view_is_valid(&cmd_header_view)) {
e368fb43 2346 ret = -LTTNG_ERR_INVALID_PROTOCOL;
d9f484bc
JG
2347 goto end;
2348 }
2349
e368fb43
JG
2350 cmd_header = (typeof(cmd_header)) cmd_header_view.data;
2351
b4e3ceb9
PP
2352 /* Set number of events and free command header */
2353 nb_events = cmd_header->nb_events;
2354 if (nb_events > INT_MAX) {
55c9e7ca 2355 ret = -LTTNG_ERR_OVERFLOW;
de453daa 2356 goto end;
b4e3ceb9 2357 }
e368fb43
JG
2358
2359 cmd_payload_view = lttng_buffer_view_from_dynamic_buffer(
2360 &payload.buffer, sizeof(*cmd_header), -1);
b4e3ceb9 2361
de453daa
JG
2362 /*
2363 * The buffer that is returned must contain a "flat" version of
2364 * the events that are returned. In other words, all pointers
2365 * within an lttng_event must point to a location within the returned
56f0bc67
JG
2366 * buffer so that the user may free everything by simply calling free()
2367 * on the returned buffer. This is needed in order to maintain API
de453daa
JG
2368 * compatibility.
2369 *
56f0bc67
JG
2370 * A first pass is performed to compute the size of the buffer that
2371 * must be allocated. A second pass is then performed to setup
de453daa
JG
2372 * the returned events so that their members always point within the
2373 * buffer.
2374 *
2375 * The layout of the returned buffer is as follows:
2376 * - struct lttng_event[nb_events],
2377 * - nb_events times the following:
2378 * - struct lttng_event_extended,
2379 * - flattened version of userspace_probe_location
2380 * - filter_expression
2381 * - exclusions
2382 * - padding to align to 64-bits
2383 */
e368fb43
JG
2384 ext_view = lttng_buffer_view_from_view(&cmd_payload_view,
2385 nb_events * sizeof(struct lttng_event), -1);
2386 comm_ext_at = ext_view.data;
de453daa 2387 storage_req = nb_events * sizeof(struct lttng_event);
e368fb43
JG
2388 {
2389 struct lttng_payload_view payload_view =
2390 lttng_payload_view_from_payload(&payload, 0, -1);
b4e3ceb9 2391
e368fb43
JG
2392 for (i = 0; i < nb_events; i++) {
2393 const struct lttcomm_event_extended_header *ext_comm =
2394 (struct lttcomm_event_extended_header *)
2395 comm_ext_at;
2396 int probe_storage_req = 0;
b4e3ceb9 2397
e368fb43
JG
2398 comm_ext_at += sizeof(*ext_comm);
2399 comm_ext_at += ext_comm->filter_len;
2400 comm_ext_at += ext_comm->nb_exclusions *
2401 LTTNG_SYMBOL_NAME_LEN;
2402
2403 if (ext_comm->userspace_probe_location_len) {
2404 struct lttng_userspace_probe_location
2405 *probe_location = NULL;
2406 struct lttng_payload_view probe_location_view = lttng_payload_view_from_view(
2407 &payload_view,
2408 (const char *) comm_ext_at -
2409 payload_view.buffer.data,
2410 ext_comm->userspace_probe_location_len);
56f0bc67 2411
3e6e0df2
JG
2412 if (!lttng_payload_view_is_valid(&probe_location_view)) {
2413 ret = -LTTNG_ERR_PROBE_LOCATION_INVAL;
2414 goto end;
2415 }
2416
e368fb43
JG
2417 /*
2418 * Create a temporary userspace probe location
2419 * to determine the size needed by a "flattened"
2420 * version of that same probe location.
2421 */
2422 ret = lttng_userspace_probe_location_create_from_payload(
2423 &probe_location_view,
2424 &probe_location);
2425 if (ret < 0) {
2426 ret = -LTTNG_ERR_PROBE_LOCATION_INVAL;
2427 goto end;
2428 }
56f0bc67 2429
e368fb43
JG
2430 ret = lttng_userspace_probe_location_flatten(
2431 probe_location, NULL);
2432 lttng_userspace_probe_location_destroy(
2433 probe_location);
2434 if (ret < 0) {
2435 ret = -LTTNG_ERR_PROBE_LOCATION_INVAL;
2436 goto end;
2437 }
56f0bc67 2438
e368fb43
JG
2439 probe_storage_req = ret;
2440 comm_ext_at += ext_comm->userspace_probe_location_len;
56f0bc67
JG
2441 }
2442
e368fb43
JG
2443 storage_req += sizeof(struct lttng_event_extended);
2444 storage_req += ext_comm->filter_len;
2445 storage_req += ext_comm->nb_exclusions *
2446 LTTNG_SYMBOL_NAME_LEN;
2447 /* Padding to ensure the flat probe is aligned. */
2448 storage_req = ALIGN_TO(storage_req, sizeof(uint64_t));
2449 storage_req += probe_storage_req;
56f0bc67 2450 }
b4e3ceb9
PP
2451 }
2452
56f0bc67
JG
2453 lttng_dynamic_buffer_init(&listing);
2454 /*
2455 * We must ensure that "listing" is never resized so as to preserve
2456 * the validity of the flattened objects.
2457 */
2458 ret = lttng_dynamic_buffer_set_capacity(&listing, storage_req);
2459 if (ret) {
2460 ret = -LTTNG_ERR_NOMEM;
de453daa
JG
2461 goto end;
2462 }
56f0bc67 2463
e368fb43
JG
2464 cmd_payload_view = lttng_buffer_view_from_dynamic_buffer(
2465 &payload_copy.buffer, sizeof(*cmd_header), -1);
2466 flat_events_view = lttng_buffer_view_from_view(&cmd_payload_view, 0,
56f0bc67 2467 nb_events * sizeof(struct lttng_event));
e368fb43 2468 ret = lttng_dynamic_buffer_append_view(&listing, &flat_events_view);
56f0bc67
JG
2469 if (ret) {
2470 ret = -LTTNG_ERR_NOMEM;
2471 goto free_dynamic_buffer;
2472 }
de453daa 2473
e368fb43
JG
2474 ext_view = lttng_buffer_view_from_view(&cmd_payload_view,
2475 nb_events * sizeof(struct lttng_event), -1);
2476 comm_ext_at = ext_view.data;
2477
2478 {
2479 struct lttng_payload_view payload_copy_view =
2480 lttng_payload_view_from_payload(
2481 &payload_copy, 0, -1);
2482
2483 for (i = 0; i < nb_events; i++) {
2484 struct lttng_event *event = (typeof(event))(
2485 listing.data +
2486 (sizeof(struct lttng_event) * i));
2487 const struct lttcomm_event_extended_header *ext_comm =
2488 (typeof(ext_comm)) comm_ext_at;
2489 struct lttng_event_extended *event_extended =
2490 (typeof(event_extended))(listing.data +
2491 listing.size);
2492
2493 /* Insert struct lttng_event_extended. */
2494 ret = lttng_dynamic_buffer_set_size(&listing,
2495 listing.size + sizeof(*event_extended));
56f0bc67
JG
2496 if (ret) {
2497 ret = -LTTNG_ERR_NOMEM;
2498 goto free_dynamic_buffer;
2499 }
e368fb43
JG
2500 event->extended.ptr = event_extended;
2501
2502 comm_ext_at += sizeof(*ext_comm);
2503
2504 /* Insert filter expression. */
2505 if (ext_comm->filter_len) {
2506 event_extended->filter_expression =
2507 listing.data + listing.size;
2508 ret = lttng_dynamic_buffer_append(&listing,
2509 comm_ext_at,
2510 ext_comm->filter_len);
2511 if (ret) {
2512 ret = -LTTNG_ERR_NOMEM;
2513 goto free_dynamic_buffer;
2514 }
2515 comm_ext_at += ext_comm->filter_len;
2516 }
56f0bc67 2517
e368fb43
JG
2518 /* Insert exclusions. */
2519 if (ext_comm->nb_exclusions) {
2520 event_extended->exclusions.count =
2521 ext_comm->nb_exclusions;
2522 event_extended->exclusions.strings =
2523 listing.data + listing.size;
2524
2525 ret = lttng_dynamic_buffer_append(&listing,
2526 comm_ext_at,
2527 ext_comm->nb_exclusions *
2528 LTTNG_SYMBOL_NAME_LEN);
2529 if (ret) {
2530 ret = -LTTNG_ERR_NOMEM;
2531 goto free_dynamic_buffer;
2532 }
2533 comm_ext_at += ext_comm->nb_exclusions *
2534 LTTNG_SYMBOL_NAME_LEN;
2535 }
56f0bc67 2536
e368fb43
JG
2537 /* Insert padding to align to 64-bits. */
2538 ret = lttng_dynamic_buffer_set_size(&listing,
2539 ALIGN_TO(listing.size,
2540 sizeof(uint64_t)));
56f0bc67
JG
2541 if (ret) {
2542 ret = -LTTNG_ERR_NOMEM;
5e4f4898 2543 goto free_dynamic_buffer;
56f0bc67 2544 }
56f0bc67 2545
e368fb43
JG
2546 /* Insert flattened userspace probe location. */
2547 if (ext_comm->userspace_probe_location_len) {
2548 struct lttng_userspace_probe_location
2549 *probe_location = NULL;
2550 struct lttng_payload_view probe_location_view = lttng_payload_view_from_view(
2551 &payload_copy_view,
2552 (const char *) comm_ext_at -
2553 payload_copy_view.buffer.data,
2554 ext_comm->userspace_probe_location_len);
2555
3e6e0df2
JG
2556 if (!lttng_payload_view_is_valid(&probe_location_view)) {
2557 ret = -LTTNG_ERR_PROBE_LOCATION_INVAL;
2558 goto free_dynamic_buffer;
2559 }
2560
e368fb43
JG
2561 ret = lttng_userspace_probe_location_create_from_payload(
2562 &probe_location_view,
2563 &probe_location);
2564 if (ret < 0) {
2565 ret = -LTTNG_ERR_PROBE_LOCATION_INVAL;
2566 goto free_dynamic_buffer;
2567 }
de453daa 2568
e368fb43
JG
2569 event_extended->probe_location = (struct lttng_userspace_probe_location
2570 *) (listing.data +
2571 listing.size);
2572 ret = lttng_userspace_probe_location_flatten(
2573 probe_location, &listing);
2574 lttng_userspace_probe_location_destroy(
2575 probe_location);
2576 if (ret < 0) {
2577 ret = -LTTNG_ERR_PROBE_LOCATION_INVAL;
2578 goto free_dynamic_buffer;
2579 }
56f0bc67 2580
e368fb43 2581 comm_ext_at += ext_comm->userspace_probe_location_len;
56f0bc67 2582 }
56f0bc67 2583 }
de453daa
JG
2584 }
2585
56f0bc67
JG
2586 /* Don't reset listing buffer as we return its content. */
2587 *events = (struct lttng_event *) listing.data;
2588 lttng_dynamic_buffer_init(&listing);
de453daa 2589 ret = (int) nb_events;
56f0bc67
JG
2590free_dynamic_buffer:
2591 lttng_dynamic_buffer_reset(&listing);
de453daa 2592end:
e368fb43
JG
2593 lttng_payload_reset(&payload);
2594 lttng_payload_reset(&payload_copy);
b4e3ceb9 2595 return ret;
9f19cc17
DG
2596}
2597
fac6795d 2598/*
1c8d13c8
TD
2599 * Sets the tracing_group variable with name.
2600 * This function allocates memory pointed to by tracing_group.
2601 * On success, returns 0, on error, returns -1 (null name) or -ENOMEM.
fac6795d
DG
2602 */
2603int lttng_set_tracing_group(const char *name)
2604{
9d697d3d 2605 if (name == NULL) {
2f70b271 2606 return -LTTNG_ERR_INVALID;
9d697d3d
DG
2607 }
2608
fac6795d 2609 if (asprintf(&tracing_group, "%s", name) < 0) {
2f70b271 2610 return -LTTNG_ERR_FATAL;
fac6795d
DG
2611 }
2612
2613 return 0;
2614}
2615
cd80958d 2616int lttng_calibrate(struct lttng_handle *handle,
d0254c7c
MD
2617 struct lttng_calibrate *calibrate)
2618{
b812e5ca
PP
2619 /*
2620 * This command was removed in LTTng 2.9.
2621 */
2622 return -LTTNG_ERR_UND;
d0254c7c
MD
2623}
2624
5edd7e09
DG
2625/*
2626 * Set default channel attributes.
441c16a7 2627 * If either or both of the arguments are null, attr content is zeroe'd.
5edd7e09
DG
2628 */
2629void lttng_channel_set_default_attr(struct lttng_domain *domain,
2630 struct lttng_channel_attr *attr)
2631{
294851b0 2632 struct lttng_channel_extended *extended;
cf0bcb51 2633
5edd7e09
DG
2634 /* Safety check */
2635 if (attr == NULL || domain == NULL) {
2636 return;
2637 }
2638
294851b0 2639 extended = (struct lttng_channel_extended *) attr->extended.ptr;
eacaa7a6
DS
2640 memset(attr, 0, sizeof(struct lttng_channel_attr));
2641
0a9c6494
DG
2642 /* Same for all domains. */
2643 attr->overwrite = DEFAULT_CHANNEL_OVERWRITE;
2644 attr->tracefile_size = DEFAULT_CHANNEL_TRACEFILE_SIZE;
2645 attr->tracefile_count = DEFAULT_CHANNEL_TRACEFILE_COUNT;
2646
5edd7e09
DG
2647 switch (domain->type) {
2648 case LTTNG_DOMAIN_KERNEL:
9ae110e2
JG
2649 attr->switch_timer_interval =
2650 DEFAULT_KERNEL_CHANNEL_SWITCH_TIMER;
d92ff3ef 2651 attr->read_timer_interval = DEFAULT_KERNEL_CHANNEL_READ_TIMER;
3e230f92 2652 attr->subbuf_size = default_get_kernel_channel_subbuf_size();
5edd7e09
DG
2653 attr->num_subbuf = DEFAULT_KERNEL_CHANNEL_SUBBUF_NUM;
2654 attr->output = DEFAULT_KERNEL_CHANNEL_OUTPUT;
cf0bcb51
JG
2655 if (extended) {
2656 extended->monitor_timer_interval =
2657 DEFAULT_KERNEL_CHANNEL_MONITOR_TIMER;
491d1539
MD
2658 extended->blocking_timeout =
2659 DEFAULT_KERNEL_CHANNEL_BLOCKING_TIMEOUT;
cf0bcb51 2660 }
5edd7e09
DG
2661 break;
2662 case LTTNG_DOMAIN_UST:
0a9c6494
DG
2663 switch (domain->buf_type) {
2664 case LTTNG_BUFFER_PER_UID:
2665 attr->subbuf_size = default_get_ust_uid_channel_subbuf_size();
2666 attr->num_subbuf = DEFAULT_UST_UID_CHANNEL_SUBBUF_NUM;
2667 attr->output = DEFAULT_UST_UID_CHANNEL_OUTPUT;
9ae110e2
JG
2668 attr->switch_timer_interval =
2669 DEFAULT_UST_UID_CHANNEL_SWITCH_TIMER;
2670 attr->read_timer_interval =
2671 DEFAULT_UST_UID_CHANNEL_READ_TIMER;
cf0bcb51
JG
2672 if (extended) {
2673 extended->monitor_timer_interval =
2674 DEFAULT_UST_UID_CHANNEL_MONITOR_TIMER;
491d1539
MD
2675 extended->blocking_timeout =
2676 DEFAULT_UST_UID_CHANNEL_BLOCKING_TIMEOUT;
cf0bcb51 2677 }
0a9c6494
DG
2678 break;
2679 case LTTNG_BUFFER_PER_PID:
2680 default:
2681 attr->subbuf_size = default_get_ust_pid_channel_subbuf_size();
2682 attr->num_subbuf = DEFAULT_UST_PID_CHANNEL_SUBBUF_NUM;
2683 attr->output = DEFAULT_UST_PID_CHANNEL_OUTPUT;
9ae110e2
JG
2684 attr->switch_timer_interval =
2685 DEFAULT_UST_PID_CHANNEL_SWITCH_TIMER;
2686 attr->read_timer_interval =
2687 DEFAULT_UST_PID_CHANNEL_READ_TIMER;
cf0bcb51
JG
2688 if (extended) {
2689 extended->monitor_timer_interval =
2690 DEFAULT_UST_PID_CHANNEL_MONITOR_TIMER;
491d1539
MD
2691 extended->blocking_timeout =
2692 DEFAULT_UST_PID_CHANNEL_BLOCKING_TIMEOUT;
cf0bcb51 2693 }
0a9c6494
DG
2694 break;
2695 }
5edd7e09 2696 default:
441c16a7 2697 /* Default behavior: leave set to 0. */
5edd7e09
DG
2698 break;
2699 }
cf0bcb51
JG
2700
2701 attr->extended.ptr = extended;
5edd7e09
DG
2702}
2703
5ba3702f
JG
2704int lttng_channel_get_discarded_event_count(struct lttng_channel *channel,
2705 uint64_t *discarded_events)
2706{
2707 int ret = 0;
cf0bcb51 2708 struct lttng_channel_extended *chan_ext;
5ba3702f
JG
2709
2710 if (!channel || !discarded_events) {
2711 ret = -LTTNG_ERR_INVALID;
2712 goto end;
2713 }
2714
2715 chan_ext = channel->attr.extended.ptr;
2716 if (!chan_ext) {
2717 /*
2718 * This can happen since the lttng_channel structure is
2719 * used for other tasks where this pointer is never set.
2720 */
2721 *discarded_events = 0;
2722 goto end;
2723 }
2724
2725 *discarded_events = chan_ext->discarded_events;
2726end:
2727 return ret;
2728}
2729
2730int lttng_channel_get_lost_packet_count(struct lttng_channel *channel,
2731 uint64_t *lost_packets)
2732{
2733 int ret = 0;
cf0bcb51 2734 struct lttng_channel_extended *chan_ext;
5ba3702f
JG
2735
2736 if (!channel || !lost_packets) {
2737 ret = -LTTNG_ERR_INVALID;
2738 goto end;
2739 }
2740
2741 chan_ext = channel->attr.extended.ptr;
2742 if (!chan_ext) {
2743 /*
2744 * This can happen since the lttng_channel structure is
2745 * used for other tasks where this pointer is never set.
2746 */
2747 *lost_packets = 0;
2748 goto end;
2749 }
2750
2751 *lost_packets = chan_ext->lost_packets;
2752end:
2753 return ret;
2754}
2755
cf0bcb51
JG
2756int lttng_channel_get_monitor_timer_interval(struct lttng_channel *chan,
2757 uint64_t *monitor_timer_interval)
2758{
2759 int ret = 0;
2760
2761 if (!chan || !monitor_timer_interval) {
2762 ret = -LTTNG_ERR_INVALID;
2763 goto end;
2764 }
2765
2766 if (!chan->attr.extended.ptr) {
2767 ret = -LTTNG_ERR_INVALID;
2768 goto end;
2769 }
2770
2771 *monitor_timer_interval = ((struct lttng_channel_extended *)
2772 chan->attr.extended.ptr)->monitor_timer_interval;
2773end:
2774 return ret;
2775}
2776
2777int lttng_channel_set_monitor_timer_interval(struct lttng_channel *chan,
2778 uint64_t monitor_timer_interval)
2779{
2780 int ret = 0;
2781
2782 if (!chan || !chan->attr.extended.ptr) {
2783 ret = -LTTNG_ERR_INVALID;
2784 goto end;
2785 }
2786
2787 ((struct lttng_channel_extended *)
2788 chan->attr.extended.ptr)->monitor_timer_interval =
2789 monitor_timer_interval;
2790end:
2791 return ret;
2792}
2793
491d1539
MD
2794int lttng_channel_get_blocking_timeout(struct lttng_channel *chan,
2795 int64_t *blocking_timeout)
2796{
2797 int ret = 0;
2798
2799 if (!chan || !blocking_timeout) {
2800 ret = -LTTNG_ERR_INVALID;
2801 goto end;
2802 }
2803
2804 if (!chan->attr.extended.ptr) {
2805 ret = -LTTNG_ERR_INVALID;
2806 goto end;
2807 }
2808
2809 *blocking_timeout = ((struct lttng_channel_extended *)
2810 chan->attr.extended.ptr)->blocking_timeout;
2811end:
2812 return ret;
2813}
2814
2815int lttng_channel_set_blocking_timeout(struct lttng_channel *chan,
2816 int64_t blocking_timeout)
2817{
2818 int ret = 0;
2819 int64_t msec_timeout;
2820
2821 if (!chan || !chan->attr.extended.ptr) {
2822 ret = -LTTNG_ERR_INVALID;
2823 goto end;
2824 }
2825
2826 if (blocking_timeout < 0 && blocking_timeout != -1) {
2827 ret = -LTTNG_ERR_INVALID;
2828 goto end;
2829 }
2830
2831 /*
2832 * LTTng-ust's use of poll() to implement this timeout mechanism forces
2833 * us to accept a narrower range of values (msecs expressed as a signed
2834 * 32-bit integer).
2835 */
2836 msec_timeout = blocking_timeout / 1000;
2837 if (msec_timeout != (int32_t) msec_timeout) {
2838 ret = -LTTNG_ERR_INVALID;
2839 goto end;
2840 }
2841
2842 ((struct lttng_channel_extended *)
2843 chan->attr.extended.ptr)->blocking_timeout =
2844 blocking_timeout;
2845end:
2846 return ret;
2847}
2848
fac6795d 2849/*
2269e89e 2850 * Check if session daemon is alive.
fac6795d 2851 *
2269e89e 2852 * Return 1 if alive or 0 if not.
1c8d13c8 2853 * On error returns a negative value.
fac6795d 2854 */
947308c4 2855int lttng_session_daemon_alive(void)
fac6795d
DG
2856{
2857 int ret;
2858
2859 ret = set_session_daemon_path();
2860 if (ret < 0) {
9ae110e2 2861 /* Error. */
fac6795d
DG
2862 return ret;
2863 }
2864
9d035200 2865 if (*sessiond_sock_path == '\0') {
2f70b271 2866 /*
9ae110e2
JG
2867 * No socket path set. Weird error which means the constructor
2868 * was not called.
2f70b271
DG
2869 */
2870 assert(0);
fac6795d
DG
2871 }
2872
2269e89e 2873 ret = try_connect_sessiond(sessiond_sock_path);
7d8234d9 2874 if (ret < 0) {
9ae110e2 2875 /* Not alive. */
7d8234d9
MD
2876 return 0;
2877 }
7d8234d9 2878
9ae110e2 2879 /* Is alive. */
947308c4 2880 return 1;
fac6795d
DG
2881}
2882
00e2e675 2883/*
a4b92340 2884 * Set URL for a consumer for a session and domain.
00e2e675
DG
2885 *
2886 * Return 0 on success, else a negative value.
2887 */
a4b92340
DG
2888int lttng_set_consumer_url(struct lttng_handle *handle,
2889 const char *control_url, const char *data_url)
00e2e675 2890{
3dd05a85 2891 int ret;
a4b92340 2892 ssize_t size;
00e2e675 2893 struct lttcomm_session_msg lsm;
a4b92340 2894 struct lttng_uri *uris = NULL;
00e2e675 2895
a4b92340 2896 if (handle == NULL || (control_url == NULL && data_url == NULL)) {
e1b624d0
JG
2897 ret = -LTTNG_ERR_INVALID;
2898 goto error;
00e2e675
DG
2899 }
2900
a4b92340
DG
2901 memset(&lsm, 0, sizeof(lsm));
2902
00e2e675
DG
2903 lsm.cmd_type = LTTNG_SET_CONSUMER_URI;
2904
e1b624d0 2905 ret = lttng_strncpy(lsm.session.name, handle->session_name,
00e2e675 2906 sizeof(lsm.session.name));
e1b624d0
JG
2907 if (ret) {
2908 ret = -LTTNG_ERR_INVALID;
2909 goto error;
2910 }
2911
60160d2a 2912 COPY_DOMAIN_PACKED(lsm.domain, handle->domain);
00e2e675 2913
bc894455 2914 size = uri_parse_str_urls(control_url, data_url, &uris);
a4b92340 2915 if (size < 0) {
e1b624d0
JG
2916 ret = -LTTNG_ERR_INVALID;
2917 goto error;
a4b92340
DG
2918 }
2919
2920 lsm.u.uri.size = size;
00e2e675 2921
795a978d 2922 ret = lttng_ctl_ask_sessiond_varlen_no_cmd_header(&lsm, uris,
cac3069d 2923 sizeof(struct lttng_uri) * size, NULL);
3dd05a85
DG
2924
2925 free(uris);
e1b624d0 2926error:
3dd05a85 2927 return ret;
00e2e675
DG
2928}
2929
2930/*
9c6bda17 2931 * [OBSOLETE]
00e2e675 2932 */
2ec40111 2933int lttng_enable_consumer(struct lttng_handle *handle);
00e2e675
DG
2934int lttng_enable_consumer(struct lttng_handle *handle)
2935{
785d2d0d 2936 return -ENOSYS;
00e2e675
DG
2937}
2938
2939/*
9c6bda17 2940 * [OBSOLETE]
00e2e675 2941 */
2ec40111 2942int lttng_disable_consumer(struct lttng_handle *handle);
00e2e675
DG
2943int lttng_disable_consumer(struct lttng_handle *handle)
2944{
785d2d0d 2945 return -ENOSYS;
00e2e675
DG
2946}
2947
07424f16 2948/*
b178f53e 2949 * [OBSOLETE]
07424f16 2950 */
2ec40111
SM
2951int _lttng_create_session_ext(const char *name, const char *url,
2952 const char *datetime);
07424f16
DG
2953int _lttng_create_session_ext(const char *name, const char *url,
2954 const char *datetime)
2955{
b178f53e 2956 return -ENOSYS;
07424f16
DG
2957}
2958
806e2684
DG
2959/*
2960 * For a given session name, this call checks if the data is ready to be read
2961 * or is still being extracted by the consumer(s) hence not ready to be used by
2962 * any readers.
2963 */
6d805429 2964int lttng_data_pending(const char *session_name)
806e2684
DG
2965{
2966 int ret;
2967 struct lttcomm_session_msg lsm;
f6151c55 2968 uint8_t *pending = NULL;
806e2684
DG
2969
2970 if (session_name == NULL) {
2971 return -LTTNG_ERR_INVALID;
2972 }
2973
53efb85a 2974 memset(&lsm, 0, sizeof(lsm));
6d805429 2975 lsm.cmd_type = LTTNG_DATA_PENDING;
806e2684 2976
e1b624d0 2977 ret = lttng_strncpy(lsm.session.name, session_name,
cac3069d 2978 sizeof(lsm.session.name));
e1b624d0
JG
2979 if (ret) {
2980 ret = -LTTNG_ERR_INVALID;
2981 goto end;
2982 }
806e2684 2983
f6151c55
JG
2984 ret = lttng_ctl_ask_sessiond(&lsm, (void **) &pending);
2985 if (ret < 0) {
2986 goto end;
2987 } else if (ret != 1) {
2988 /* Unexpected payload size */
2989 ret = -LTTNG_ERR_INVALID;
2990 goto end;
e848d36d
JG
2991 } else if (!pending) {
2992 /* Internal error. */
2993 ret = -LTTNG_ERR_UNK;
2994 goto end;
806e2684
DG
2995 }
2996
f6151c55
JG
2997 ret = (int) *pending;
2998end:
2999 free(pending);
806e2684
DG
3000 return ret;
3001}
3002
93ec662e
JD
3003/*
3004 * Regenerate the metadata for a session.
3005 * Return 0 on success, a negative error code on error.
3006 */
eded6438 3007int lttng_regenerate_metadata(const char *session_name)
93ec662e
JD
3008{
3009 int ret;
3010 struct lttcomm_session_msg lsm;
3011
3012 if (!session_name) {
3013 ret = -LTTNG_ERR_INVALID;
3014 goto end;
3015 }
3016
3017 memset(&lsm, 0, sizeof(lsm));
eded6438 3018 lsm.cmd_type = LTTNG_REGENERATE_METADATA;
93ec662e 3019
e1b624d0 3020 ret = lttng_strncpy(lsm.session.name, session_name,
93ec662e 3021 sizeof(lsm.session.name));
e1b624d0
JG
3022 if (ret) {
3023 ret = -LTTNG_ERR_INVALID;
3024 goto end;
3025 }
93ec662e
JD
3026
3027 ret = lttng_ctl_ask_sessiond(&lsm, NULL);
3028 if (ret < 0) {
3029 goto end;
3030 }
3031
3032 ret = 0;
3033end:
3034 return ret;
3035}
3036
eded6438
JD
3037/*
3038 * Deprecated, replaced by lttng_regenerate_metadata.
3039 */
3040int lttng_metadata_regenerate(const char *session_name)
3041{
3042 return lttng_regenerate_metadata(session_name);
3043}
3044
c2561365
JD
3045/*
3046 * Regenerate the statedump of a session.
3047 * Return 0 on success, a negative error code on error.
3048 */
3049int lttng_regenerate_statedump(const char *session_name)
3050{
3051 int ret;
3052 struct lttcomm_session_msg lsm;
3053
3054 if (!session_name) {
3055 ret = -LTTNG_ERR_INVALID;
3056 goto end;
3057 }
3058
3059 memset(&lsm, 0, sizeof(lsm));
3060 lsm.cmd_type = LTTNG_REGENERATE_STATEDUMP;
3061
e1b624d0 3062 ret = lttng_strncpy(lsm.session.name, session_name,
c2561365 3063 sizeof(lsm.session.name));
e1b624d0
JG
3064 if (ret) {
3065 ret = -LTTNG_ERR_INVALID;
3066 goto end;
3067 }
c2561365
JD
3068
3069 ret = lttng_ctl_ask_sessiond(&lsm, NULL);
3070 if (ret < 0) {
3071 goto end;
3072 }
3073
3074 ret = 0;
3075end:
3076 return ret;
3077}
3078
a58c490f
JG
3079int lttng_register_trigger(struct lttng_trigger *trigger)
3080{
3081 int ret;
99608320
JR
3082 struct lttcomm_session_msg lsm = {
3083 .cmd_type = LTTNG_REGISTER_TRIGGER,
3084 };
3085 struct lttcomm_session_msg *message_lsm;
3086 struct lttng_payload message;
3087 struct lttng_payload reply;
242388e4 3088 struct lttng_trigger *reply_trigger = NULL;
9124c630 3089 enum lttng_domain_type domain_type;
64eafdf6
JR
3090 const struct lttng_credentials user_creds = {
3091 .uid = LTTNG_OPTIONAL_INIT_VALUE(geteuid()),
3092 .gid = LTTNG_OPTIONAL_INIT_UNSET,
3093 };
99608320 3094
242388e4 3095
99608320
JR
3096 lttng_payload_init(&message);
3097 lttng_payload_init(&reply);
a58c490f
JG
3098
3099 if (!trigger) {
3100 ret = -LTTNG_ERR_INVALID;
3101 goto end;
3102 }
3103
64eafdf6
JR
3104 if (!trigger->creds.uid.is_set) {
3105 /* Use the client's credentials as the trigger credentials. */
3106 lttng_trigger_set_credentials(trigger, &user_creds);
3107 } else {
3108 /*
3109 * Validate that either the current trigger credentials and the
3110 * client credentials are identical or that the current user is
3111 * root. The root user can register, unregister triggers for
3112 * himself and other users.
3113 *
3114 * This check is also present on the sessiond side, using the
3115 * credentials passed on the socket. These check are all
3116 * "safety" checks.
3117 */
3118 const struct lttng_credentials *trigger_creds =
3119 lttng_trigger_get_credentials(trigger);
3120
3121 if (!lttng_credentials_is_equal_uid(trigger_creds, &user_creds)) {
3122 if (lttng_credentials_get_uid(&user_creds) != 0) {
3123 ret = -LTTNG_ERR_EPERM;
3124 goto end;
3125 }
3126 }
3127 }
3128
a58c490f 3129 if (!lttng_trigger_validate(trigger)) {
eac4828d 3130 ret = -LTTNG_ERR_INVALID_TRIGGER;
a58c490f
JG
3131 goto end;
3132 }
3133
9124c630
JR
3134 domain_type = lttng_trigger_get_underlying_domain_type_restriction(
3135 trigger);
3136
3137 lsm.domain.type = domain_type;
3138
97285430
JG
3139 ret = lttng_dynamic_buffer_append(&message.buffer, &lsm, sizeof(lsm));
3140 if (ret) {
3141 ret = -LTTNG_ERR_NOMEM;
3142 goto end;
3143 }
99608320
JR
3144
3145 /*
3146 * This is needed to populate the trigger object size for the command
3147 * header.
3148 */
3149 message_lsm = (struct lttcomm_session_msg *) message.buffer.data;
3150
3151 ret = lttng_trigger_serialize(trigger, &message);
3647288f 3152 if (ret < 0) {
a58c490f
JG
3153 ret = -LTTNG_ERR_UNK;
3154 goto end;
3155 }
3156
99608320
JR
3157 message_lsm->u.trigger.length = (uint32_t) message.buffer.size - sizeof(lsm);
3158
3159 {
3160 struct lttng_payload_view message_view =
3161 lttng_payload_view_from_payload(
3162 &message, 0, -1);
3163
3164 message_lsm->fd_count = lttng_payload_view_get_fd_handle_count(
3165 &message_view);
3166 ret = lttng_ctl_ask_sessiond_payload(&message_view, &reply);
3167 if (ret < 0) {
3168 goto end;
3169 }
3170 }
3171
242388e4
JR
3172 {
3173 struct lttng_payload_view reply_view =
3174 lttng_payload_view_from_payload(
3175 &reply, 0, reply.buffer.size);
3176
3177 ret = lttng_trigger_create_from_payload(
3178 &reply_view, &reply_trigger);
3179 if (ret < 0) {
3180 ret = -LTTNG_ERR_FATAL;
3181 goto end;
3182 }
3183 }
3184
3185 ret = lttng_trigger_assign_name(trigger, reply_trigger);
3186 if (ret < 0) {
3187 ret = -LTTNG_ERR_FATAL;
3188 goto end;
3189 }
3190
99608320 3191 ret = 0;
a58c490f 3192end:
99608320
JR
3193 lttng_payload_reset(&message);
3194 lttng_payload_reset(&reply);
242388e4 3195 lttng_trigger_destroy(reply_trigger);
a58c490f
JG
3196 return ret;
3197}
3198
3199int lttng_unregister_trigger(struct lttng_trigger *trigger)
3200{
3201 int ret;
3202 struct lttcomm_session_msg lsm;
99608320
JR
3203 struct lttcomm_session_msg *message_lsm;
3204 struct lttng_payload message;
3205 struct lttng_payload reply;
64eafdf6
JR
3206 const struct lttng_credentials user_creds = {
3207 .uid = LTTNG_OPTIONAL_INIT_VALUE(geteuid()),
3208 .gid = LTTNG_OPTIONAL_INIT_UNSET,
3209 };
99608320
JR
3210
3211 lttng_payload_init(&message);
3212 lttng_payload_init(&reply);
a58c490f
JG
3213
3214 if (!trigger) {
3215 ret = -LTTNG_ERR_INVALID;
3216 goto end;
3217 }
3218
64eafdf6
JR
3219 if (!trigger->creds.uid.is_set) {
3220 /* Use the client's credentials as the trigger credentials. */
3221 lttng_trigger_set_credentials(trigger, &user_creds);
3222 } else {
3223 /*
3224 * Validate that either the current trigger credentials and the
3225 * client credentials are identical or that the current user is
3226 * root. The root user can register, unregister triggers for
3227 * himself and other users.
3228 *
3229 * This check is also present on the sessiond side, using the
3230 * credentials passed on the socket. These check are all
3231 * "safety" checks.
3232 */
3233 const struct lttng_credentials *trigger_creds =
3234 lttng_trigger_get_credentials(trigger);
3235
3236 if (!lttng_credentials_is_equal_uid(trigger_creds, &user_creds)) {
3237 if (lttng_credentials_get_uid(&user_creds) != 0) {
3238 ret = -LTTNG_ERR_EPERM;
3239 goto end;
3240 }
3241 }
3242 }
3243
a58c490f 3244 if (!lttng_trigger_validate(trigger)) {
3647288f 3245 ret = -LTTNG_ERR_INVALID_TRIGGER;
a58c490f
JG
3246 goto end;
3247 }
3248
99608320
JR
3249 memset(&lsm, 0, sizeof(lsm));
3250 lsm.cmd_type = LTTNG_UNREGISTER_TRIGGER;
3251
97285430
JG
3252 ret = lttng_dynamic_buffer_append(&message.buffer, &lsm, sizeof(lsm));
3253 if (ret) {
3254 ret = -LTTNG_ERR_NOMEM;
3255 goto end;
3256 }
99608320
JR
3257
3258 /*
3259 * This is needed to populate the trigger object size for the command
3260 * header and number of fds sent.
3261 */
3262 message_lsm = (struct lttcomm_session_msg *) message.buffer.data;
3263
3264 ret = lttng_trigger_serialize(trigger, &message);
3647288f 3265 if (ret < 0) {
a58c490f
JG
3266 ret = -LTTNG_ERR_UNK;
3267 goto end;
3268 }
3269
99608320
JR
3270 message_lsm->u.trigger.length = (uint32_t) message.buffer.size - sizeof(lsm);
3271
3272 {
3273 struct lttng_payload_view message_view =
3274 lttng_payload_view_from_payload(
3275 &message, 0, -1);
3276
3277 /*
3278 * Update the message header with the number of fd that will be
3279 * sent.
3280 */
3281 message_lsm->fd_count = lttng_payload_view_get_fd_handle_count(
3282 &message_view);
3283
3284 ret = lttng_ctl_ask_sessiond_payload(&message_view, &reply);
3285 if (ret < 0) {
3286 goto end;
3287 }
3288 }
3289
3290 ret = 0;
a58c490f 3291end:
99608320
JR
3292 lttng_payload_reset(&message);
3293 lttng_payload_reset(&reply);
a58c490f
JG
3294 return ret;
3295}
3296
fbc9f37d
JR
3297/*
3298 * Ask the session daemon for all registered triggers for the current user.
3299 *
3300 * Allocates and return an lttng_triggers set.
3301 * On error, returns a suitable lttng_error_code.
3302 */
3303enum lttng_error_code lttng_list_triggers(struct lttng_triggers **triggers)
3304{
3305 int ret;
3306 enum lttng_error_code ret_code = LTTNG_OK;
3307 struct lttcomm_session_msg lsm = { .cmd_type = LTTNG_LIST_TRIGGERS };
3308 struct lttng_triggers *local_triggers = NULL;
3309 struct lttng_payload reply;
3310 struct lttng_payload_view lsm_view =
3311 lttng_payload_view_init_from_buffer(
3312 (const char *) &lsm, 0, sizeof(lsm));
3313
3314 lttng_payload_init(&reply);
3315
3316 ret = lttng_ctl_ask_sessiond_payload(&lsm_view, &reply);
3317 if (ret < 0) {
3318 ret_code = (enum lttng_error_code) -ret;
3319 goto end;
3320 }
3321
3322 {
3323 struct lttng_payload_view reply_view =
3324 lttng_payload_view_from_payload(
3325 &reply, 0, reply.buffer.size);
3326
3327 ret = lttng_triggers_create_from_payload(
3328 &reply_view, &local_triggers);
3329 if (ret < 0) {
3330 ret_code = LTTNG_ERR_FATAL;
3331 goto end;
3332 }
3333 }
3334
3335 *triggers = local_triggers;
3336 local_triggers = NULL;
3337end:
3338 lttng_payload_reset(&reply);
3339 lttng_triggers_destroy(local_triggers);
3340 return ret_code;
3341}
3342
fac6795d 3343/*
9ae110e2 3344 * lib constructor.
fac6795d 3345 */
b2b89e8a 3346static void __attribute__((constructor)) init(void)
fac6795d
DG
3347{
3348 /* Set default session group */
bbccc3d2 3349 lttng_set_tracing_group(DEFAULT_TRACING_GROUP);
fac6795d 3350}
49cca668
DG
3351
3352/*
9ae110e2 3353 * lib destructor.
49cca668 3354 */
b2b89e8a 3355static void __attribute__((destructor)) lttng_ctl_exit(void)
49cca668
DG
3356{
3357 free(tracing_group);
3358}
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