Fix: don't hide EBADF error subbuffer write
[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>
2001793c 7 * Copyright (C) 2016 - Jérémie Galarneau <jeremie.galarneau@efficios.com>
fac6795d 8 *
d14d33bf
AM
9 * This library is free software; you can redistribute it and/or modify it
10 * under the terms of the GNU Lesser General Public License, version 2.1 only,
11 * as published by the Free Software Foundation.
82a3637f
DG
12 *
13 * This library is distributed in the hope that it will be useful,
fac6795d 14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
82a3637f
DG
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 * Lesser General Public License for more details.
17 *
d14d33bf
AM
18 * You should have received a copy of the GNU Lesser General Public License
19 * along with this library; if not, write to the Free Software Foundation,
20 * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
fac6795d
DG
21 */
22
6c1c0768 23#define _LGPL_SOURCE
44a5e5eb 24#include <assert.h>
fac6795d 25#include <grp.h>
1e307fab 26#include <errno.h>
fac6795d
DG
27#include <stdio.h>
28#include <stdlib.h>
29#include <string.h>
30#include <unistd.h>
31
990570ed 32#include <common/common.h>
15e37663 33#include <common/compat/string.h>
990570ed 34#include <common/defaults.h>
db758600 35#include <common/sessiond-comm/sessiond-comm.h>
a4b92340 36#include <common/uri.h>
feb0f3e5 37#include <common/utils.h>
de453daa 38#include <common/dynamic-buffer.h>
1e307fab 39#include <lttng/lttng.h>
0c89d795 40#include <lttng/health-internal.h>
a58c490f
JG
41#include <lttng/trigger/trigger-internal.h>
42#include <lttng/endpoint.h>
43#include <lttng/channel-internal.h>
de453daa 44#include <lttng/event-internal.h>
15e37663 45#include <lttng/userspace-probe-internal.h>
b178f53e
JG
46#include <lttng/session-internal.h>
47#include <lttng/session-descriptor-internal.h>
fac6795d 48
d00c599e
DG
49#include "filter/filter-ast.h"
50#include "filter/filter-parser.h"
51#include "filter/filter-bytecode.h"
52#include "filter/memstream.h"
cac3069d 53#include "lttng-ctl-helper.h"
53a80697
MD
54
55#ifdef DEBUG
d00c599e 56static const int print_xml = 1;
53a80697
MD
57#define dbg_printf(fmt, args...) \
58 printf("[debug liblttng-ctl] " fmt, ## args)
59#else
d00c599e 60static const int print_xml = 0;
53a80697
MD
61#define dbg_printf(fmt, args...) \
62do { \
63 /* do nothing but check printf format */ \
64 if (0) \
65 printf("[debug liblttnctl] " fmt, ## args); \
66} while (0)
67#endif
68
69
fac6795d
DG
70/* Socket to session daemon for communication */
71static int sessiond_socket;
72static char sessiond_sock_path[PATH_MAX];
73
fac6795d
DG
74/* Variables */
75static char *tracing_group;
76static int connected;
77
97e19046
DG
78/* Global */
79
80/*
81 * Those two variables are used by error.h to silent or control the verbosity of
82 * error message. They are global to the library so application linking with it
83 * are able to compile correctly and also control verbosity of the library.
97e19046
DG
84 */
85int lttng_opt_quiet;
86int lttng_opt_verbose;
c7e35b03 87int lttng_opt_mi;
97e19046 88
99497cd0
MD
89/*
90 * Copy string from src to dst and enforce null terminated byte.
91 */
cac3069d
DG
92LTTNG_HIDDEN
93void lttng_ctl_copy_string(char *dst, const char *src, size_t len)
99497cd0 94{
e7d6716d 95 if (src && dst) {
99497cd0
MD
96 strncpy(dst, src, len);
97 /* Enforce the NULL terminated byte */
98 dst[len - 1] = '\0';
cd80958d
DG
99 } else if (dst) {
100 dst[0] = '\0';
99497cd0
MD
101 }
102}
103
fac6795d 104/*
cd80958d 105 * Copy domain to lttcomm_session_msg domain.
fac6795d 106 *
cd80958d
DG
107 * If domain is unknown, default domain will be the kernel.
108 */
cac3069d
DG
109LTTNG_HIDDEN
110void lttng_ctl_copy_lttng_domain(struct lttng_domain *dst,
111 struct lttng_domain *src)
cd80958d
DG
112{
113 if (src && dst) {
114 switch (src->type) {
00e2e675
DG
115 case LTTNG_DOMAIN_KERNEL:
116 case LTTNG_DOMAIN_UST:
b9dfb167 117 case LTTNG_DOMAIN_JUL:
5cdb6027 118 case LTTNG_DOMAIN_LOG4J:
0e115563 119 case LTTNG_DOMAIN_PYTHON:
00e2e675
DG
120 memcpy(dst, src, sizeof(struct lttng_domain));
121 break;
122 default:
123 memset(dst, 0, sizeof(struct lttng_domain));
00e2e675 124 break;
cd80958d
DG
125 }
126 }
127}
128
129/*
130 * Send lttcomm_session_msg to the session daemon.
fac6795d 131 *
1c8d13c8
TD
132 * On success, returns the number of bytes sent (>=0)
133 * On error, returns -1
fac6795d 134 */
cd80958d 135static int send_session_msg(struct lttcomm_session_msg *lsm)
fac6795d
DG
136{
137 int ret;
138
139 if (!connected) {
2f70b271 140 ret = -LTTNG_ERR_NO_SESSIOND;
e065084a 141 goto end;
fac6795d
DG
142 }
143
a4b92340
DG
144 DBG("LSM cmd type : %d", lsm->cmd_type);
145
be040666 146 ret = lttcomm_send_creds_unix_sock(sessiond_socket, lsm,
cd80958d 147 sizeof(struct lttcomm_session_msg));
2f70b271
DG
148 if (ret < 0) {
149 ret = -LTTNG_ERR_FATAL;
150 }
e065084a
DG
151
152end:
153 return ret;
154}
155
53a80697
MD
156/*
157 * Send var len data to the session daemon.
158 *
159 * On success, returns the number of bytes sent (>=0)
160 * On error, returns -1
161 */
c2d69327 162static int send_session_varlen(const void *data, size_t len)
53a80697
MD
163{
164 int ret;
165
166 if (!connected) {
2f70b271 167 ret = -LTTNG_ERR_NO_SESSIOND;
53a80697
MD
168 goto end;
169 }
a4b92340 170
53a80697
MD
171 if (!data || !len) {
172 ret = 0;
173 goto end;
174 }
175
176 ret = lttcomm_send_unix_sock(sessiond_socket, data, len);
2f70b271
DG
177 if (ret < 0) {
178 ret = -LTTNG_ERR_FATAL;
179 }
53a80697
MD
180
181end:
182 return ret;
183}
184
a04d53fc
FD
185/*
186 * Send file descriptors to the session daemon.
187 *
188 * On success, returns the number of bytes sent (>=0)
189 * On error, returns -1
190 */
191static int send_session_fds(const int *fds, size_t nb_fd)
192{
193 int ret;
194
195 if (!connected) {
196 ret = -LTTNG_ERR_NO_SESSIOND;
197 goto end;
198 }
199
200 if (!fds || !nb_fd) {
201 ret = 0;
202 goto end;
203 }
204
205 ret = lttcomm_send_fds_unix_sock(sessiond_socket, fds, nb_fd);
206 if (ret < 0) {
207 ret = -LTTNG_ERR_FATAL;
208 }
209
210end:
211 return ret;
212}
213
e065084a 214/*
cd80958d 215 * Receive data from the sessiond socket.
e065084a 216 *
1c8d13c8
TD
217 * On success, returns the number of bytes received (>=0)
218 * On error, returns -1 (recvmsg() error) or -ENOTCONN
e065084a 219 */
ca95a216 220static int recv_data_sessiond(void *buf, size_t len)
e065084a
DG
221{
222 int ret;
223
224 if (!connected) {
2f70b271 225 ret = -LTTNG_ERR_NO_SESSIOND;
e065084a 226 goto end;
fac6795d
DG
227 }
228
ca95a216 229 ret = lttcomm_recv_unix_sock(sessiond_socket, buf, len);
2f70b271
DG
230 if (ret < 0) {
231 ret = -LTTNG_ERR_FATAL;
232 }
fac6795d 233
e065084a 234end:
fac6795d
DG
235 return ret;
236}
237
238/*
9ae110e2 239 * Check if we are in the specified group.
65beb5ff 240 *
9ae110e2 241 * If yes return 1, else return -1.
947308c4 242 */
6c71277b
MD
243LTTNG_HIDDEN
244int lttng_check_tracing_group(void)
947308c4 245{
28ab59d0 246 gid_t *grp_list, tracing_gid;
947308c4
DG
247 int grp_list_size, grp_id, i;
248 int ret = -1;
6c71277b 249 const char *grp_name = tracing_group;
947308c4
DG
250
251 /* Get GID of group 'tracing' */
28ab59d0 252 if (utils_get_group_id(grp_name, false, &tracing_gid)) {
b4d8603b 253 /* If grp_tracing is NULL, the group does not exist. */
947308c4
DG
254 goto end;
255 }
256
257 /* Get number of supplementary group IDs */
258 grp_list_size = getgroups(0, NULL);
259 if (grp_list_size < 0) {
6f04ed72 260 PERROR("getgroups");
947308c4
DG
261 goto end;
262 }
263
264 /* Alloc group list of the right size */
3f451dc0 265 grp_list = zmalloc(grp_list_size * sizeof(gid_t));
00795392 266 if (!grp_list) {
6f04ed72 267 PERROR("malloc");
00795392
MD
268 goto end;
269 }
947308c4 270 grp_id = getgroups(grp_list_size, grp_list);
1c8d13c8 271 if (grp_id < 0) {
6f04ed72 272 PERROR("getgroups");
947308c4
DG
273 goto free_list;
274 }
275
276 for (i = 0; i < grp_list_size; i++) {
28ab59d0 277 if (grp_list[i] == tracing_gid) {
2269e89e 278 ret = 1;
947308c4
DG
279 break;
280 }
281 }
282
283free_list:
284 free(grp_list);
285
286end:
287 return ret;
288}
289
09b72f7a
FD
290static int check_enough_available_memory(size_t num_bytes_requested_per_cpu)
291{
292 int ret;
293 long num_cpu;
294 size_t best_mem_info;
295 size_t num_bytes_requested_total;
296
297 /*
298 * Get the number of CPU currently online to compute the amount of
299 * memory needed to create a buffer for every CPU.
300 */
301 num_cpu = sysconf(_SC_NPROCESSORS_ONLN);
302 if (num_cpu == -1) {
303 goto error;
304 }
305
306 num_bytes_requested_total = num_bytes_requested_per_cpu * num_cpu;
307
308 /*
309 * Try to get the `MemAvail` field of `/proc/meminfo`. This is the most
310 * reliable estimate we can get but it is only exposed by the kernel
311 * since 3.14. (See Linux kernel commit:
312 * 34e431b0ae398fc54ea69ff85ec700722c9da773)
313 */
314 ret = utils_get_memory_available(&best_mem_info);
315 if (ret >= 0) {
316 goto success;
317 }
318
319 /*
320 * As a backup plan, use `MemTotal` field of `/proc/meminfo`. This
321 * is a sanity check for obvious user error.
322 */
323 ret = utils_get_memory_total(&best_mem_info);
324 if (ret >= 0) {
325 goto success;
326 }
327
328error:
329 return -1;
330success:
331 return best_mem_info >= num_bytes_requested_total;
332}
333
947308c4 334/*
2269e89e
DG
335 * Try connect to session daemon with sock_path.
336 *
337 * Return 0 on success, else -1
338 */
339static int try_connect_sessiond(const char *sock_path)
340{
341 int ret;
342
343 /* If socket exist, we check if the daemon listens for connect. */
344 ret = access(sock_path, F_OK);
345 if (ret < 0) {
346 /* Not alive */
2f70b271 347 goto error;
2269e89e
DG
348 }
349
350 ret = lttcomm_connect_unix_sock(sock_path);
351 if (ret < 0) {
9ae110e2 352 /* Not alive. */
2f70b271 353 goto error;
2269e89e
DG
354 }
355
356 ret = lttcomm_close_unix_sock(ret);
357 if (ret < 0) {
6f04ed72 358 PERROR("lttcomm_close_unix_sock");
2269e89e
DG
359 }
360
361 return 0;
2f70b271
DG
362
363error:
364 return -1;
2269e89e
DG
365}
366
367/*
2f70b271
DG
368 * Set sessiond socket path by putting it in the global sessiond_sock_path
369 * variable.
370 *
371 * Returns 0 on success, negative value on failure (the sessiond socket path
372 * is somehow too long or ENOMEM).
947308c4
DG
373 */
374static int set_session_daemon_path(void)
375{
9ae110e2 376 int in_tgroup = 0; /* In tracing group. */
2269e89e
DG
377 uid_t uid;
378
379 uid = getuid();
947308c4 380
2269e89e
DG
381 if (uid != 0) {
382 /* Are we in the tracing group ? */
6c71277b 383 in_tgroup = lttng_check_tracing_group();
2269e89e
DG
384 }
385
08a9c49f 386 if ((uid == 0) || in_tgroup) {
cac3069d
DG
387 lttng_ctl_copy_string(sessiond_sock_path,
388 DEFAULT_GLOBAL_CLIENT_UNIX_SOCK, sizeof(sessiond_sock_path));
08a9c49f 389 }
2269e89e 390
08a9c49f 391 if (uid != 0) {
c617c0c6
MD
392 int ret;
393
08a9c49f 394 if (in_tgroup) {
9ae110e2 395 /* Tracing group. */
08a9c49f
TD
396 ret = try_connect_sessiond(sessiond_sock_path);
397 if (ret >= 0) {
398 goto end;
2269e89e 399 }
08a9c49f 400 /* Global session daemon not available... */
2269e89e 401 }
08a9c49f
TD
402 /* ...or not in tracing group (and not root), default */
403
404 /*
9ae110e2
JG
405 * With GNU C < 2.1, snprintf returns -1 if the target buffer
406 * is too small;
407 * With GNU C >= 2.1, snprintf returns the required size
408 * (excluding closing null)
08a9c49f
TD
409 */
410 ret = snprintf(sessiond_sock_path, sizeof(sessiond_sock_path),
feb0f3e5 411 DEFAULT_HOME_CLIENT_UNIX_SOCK, utils_get_home_dir());
08a9c49f 412 if ((ret < 0) || (ret >= sizeof(sessiond_sock_path))) {
2f70b271 413 goto error;
947308c4 414 }
947308c4 415 }
08a9c49f 416end:
947308c4 417 return 0;
2f70b271
DG
418
419error:
420 return -1;
947308c4
DG
421}
422
65beb5ff 423/*
9ae110e2 424 * Connect to the LTTng session daemon.
65beb5ff 425 *
9ae110e2 426 * On success, return 0. On error, return -1.
65beb5ff
DG
427 */
428static int connect_sessiond(void)
429{
430 int ret;
431
da3c9ec1
DG
432 /* Don't try to connect if already connected. */
433 if (connected) {
434 return 0;
435 }
436
65beb5ff
DG
437 ret = set_session_daemon_path();
438 if (ret < 0) {
2f70b271 439 goto error;
65beb5ff
DG
440 }
441
9ae110e2 442 /* Connect to the sesssion daemon. */
65beb5ff
DG
443 ret = lttcomm_connect_unix_sock(sessiond_sock_path);
444 if (ret < 0) {
2f70b271 445 goto error;
65beb5ff
DG
446 }
447
448 sessiond_socket = ret;
449 connected = 1;
450
451 return 0;
2f70b271
DG
452
453error:
454 return -1;
65beb5ff
DG
455}
456
457/*
1c8d13c8 458 * Clean disconnect from the session daemon.
9ae110e2 459 *
1c8d13c8 460 * On success, return 0. On error, return -1.
65beb5ff
DG
461 */
462static int disconnect_sessiond(void)
463{
464 int ret = 0;
465
466 if (connected) {
467 ret = lttcomm_close_unix_sock(sessiond_socket);
468 sessiond_socket = 0;
469 connected = 0;
470 }
471
472 return ret;
473}
474
795a978d
PP
475static int recv_sessiond_optional_data(size_t len, void **user_buf,
476 size_t *user_len)
477{
478 int ret = 0;
479 void *buf = NULL;
480
481 if (len) {
482 if (!user_len) {
483 ret = -LTTNG_ERR_INVALID;
484 goto end;
485 }
486
487 buf = zmalloc(len);
488 if (!buf) {
489 ret = -ENOMEM;
490 goto end;
491 }
492
493 ret = recv_data_sessiond(buf, len);
494 if (ret < 0) {
495 goto end;
496 }
497
498 if (!user_buf) {
499 ret = -LTTNG_ERR_INVALID;
500 goto end;
501 }
502
503 /* Move ownership of command header buffer to user. */
504 *user_buf = buf;
505 buf = NULL;
506 *user_len = len;
507 } else {
508 /* No command header. */
509 if (user_len) {
510 *user_len = 0;
511 }
512
513 if (user_buf) {
514 *user_buf = NULL;
515 }
516 }
517
518end:
519 free(buf);
520 return ret;
521}
522
35a6fdb7 523/*
cd80958d 524 * Ask the session daemon a specific command and put the data into buf.
a04d53fc
FD
525 * Takes extra var. len. data and file descriptors as input to send to the
526 * session daemon.
65beb5ff 527 *
af87c45a 528 * Return size of data (only payload, not header) or a negative error code.
65beb5ff 529 */
cac3069d 530LTTNG_HIDDEN
a04d53fc
FD
531int lttng_ctl_ask_sessiond_fds_varlen(struct lttcomm_session_msg *lsm,
532 const int *fds, size_t nb_fd, const void *vardata,
533 size_t vardata_len, void **user_payload_buf,
534 void **user_cmd_header_buf, size_t *user_cmd_header_len)
65beb5ff
DG
535{
536 int ret;
795a978d 537 size_t payload_len;
cd80958d 538 struct lttcomm_lttng_msg llm;
65beb5ff
DG
539
540 ret = connect_sessiond();
541 if (ret < 0) {
2f70b271 542 ret = -LTTNG_ERR_NO_SESSIOND;
65beb5ff
DG
543 goto end;
544 }
545
65beb5ff 546 /* Send command to session daemon */
cd80958d 547 ret = send_session_msg(lsm);
65beb5ff 548 if (ret < 0) {
2f70b271 549 /* Ret value is a valid lttng error code. */
65beb5ff
DG
550 goto end;
551 }
53a80697 552 /* Send var len data */
795a978d 553 ret = send_session_varlen(vardata, vardata_len);
53a80697 554 if (ret < 0) {
2f70b271 555 /* Ret value is a valid lttng error code. */
53a80697
MD
556 goto end;
557 }
65beb5ff 558
a04d53fc
FD
559 /* Send fds */
560 ret = send_session_fds(fds, nb_fd);
561 if (ret < 0) {
562 /* Ret value is a valid lttng error code. */
563 goto end;
564 }
565
65beb5ff
DG
566 /* Get header from data transmission */
567 ret = recv_data_sessiond(&llm, sizeof(llm));
568 if (ret < 0) {
2f70b271 569 /* Ret value is a valid lttng error code. */
65beb5ff
DG
570 goto end;
571 }
572
573 /* Check error code if OK */
f73fabfd 574 if (llm.ret_code != LTTNG_OK) {
65beb5ff
DG
575 ret = -llm.ret_code;
576 goto end;
577 }
578
795a978d
PP
579 /* Get command header from data transmission */
580 ret = recv_sessiond_optional_data(llm.cmd_header_size,
581 user_cmd_header_buf, user_cmd_header_len);
65beb5ff 582 if (ret < 0) {
65beb5ff
DG
583 goto end;
584 }
585
795a978d
PP
586 /* Get payload from data transmission */
587 ret = recv_sessiond_optional_data(llm.data_size, user_payload_buf,
588 &payload_len);
589 if (ret < 0) {
83009e5e
DG
590 goto end;
591 }
592
795a978d 593 ret = llm.data_size;
65beb5ff
DG
594
595end:
596 disconnect_sessiond();
597 return ret;
598}
599
9f19cc17 600/*
cd80958d 601 * Create lttng handle and return pointer.
9ae110e2 602 *
1c8d13c8 603 * The returned pointer will be NULL in case of malloc() error.
9f19cc17 604 */
cd80958d
DG
605struct lttng_handle *lttng_create_handle(const char *session_name,
606 struct lttng_domain *domain)
9f19cc17 607{
2f70b271
DG
608 struct lttng_handle *handle = NULL;
609
3f451dc0 610 handle = zmalloc(sizeof(struct lttng_handle));
cd80958d 611 if (handle == NULL) {
2f70b271 612 PERROR("malloc handle");
cd80958d
DG
613 goto end;
614 }
615
616 /* Copy session name */
cac3069d 617 lttng_ctl_copy_string(handle->session_name, session_name,
cd80958d
DG
618 sizeof(handle->session_name));
619
95681498
JG
620 /* Copy lttng domain or leave initialized to 0. */
621 if (domain) {
622 lttng_ctl_copy_lttng_domain(&handle->domain, domain);
623 }
cd80958d
DG
624
625end:
626 return handle;
627}
628
629/*
630 * Destroy handle by free(3) the pointer.
631 */
632void lttng_destroy_handle(struct lttng_handle *handle)
633{
0e428499 634 free(handle);
eb354453
DG
635}
636
d9800920
DG
637/*
638 * Register an outside consumer.
9ae110e2 639 *
1c8d13c8 640 * Returns size of returned session payload data or a negative error code.
d9800920
DG
641 */
642int lttng_register_consumer(struct lttng_handle *handle,
643 const char *socket_path)
644{
645 struct lttcomm_session_msg lsm;
646
2f70b271
DG
647 if (handle == NULL || socket_path == NULL) {
648 return -LTTNG_ERR_INVALID;
649 }
650
53efb85a 651 memset(&lsm, 0, sizeof(lsm));
d9800920 652 lsm.cmd_type = LTTNG_REGISTER_CONSUMER;
cac3069d 653 lttng_ctl_copy_string(lsm.session.name, handle->session_name,
d9800920 654 sizeof(lsm.session.name));
cac3069d 655 lttng_ctl_copy_lttng_domain(&lsm.domain, &handle->domain);
d9800920 656
9ae110e2
JG
657 lttng_ctl_copy_string(lsm.u.reg.path, socket_path,
658 sizeof(lsm.u.reg.path));
d9800920 659
cac3069d 660 return lttng_ctl_ask_sessiond(&lsm, NULL);
d9800920
DG
661}
662
1df4dedd 663/*
9ae110e2
JG
664 * Start tracing for all traces of the session.
665 *
666 * Returns size of returned session payload data or a negative error code.
1df4dedd 667 */
6a4f824d 668int lttng_start_tracing(const char *session_name)
f3ed775e 669{
cd80958d
DG
670 struct lttcomm_session_msg lsm;
671
6a4f824d 672 if (session_name == NULL) {
2f70b271 673 return -LTTNG_ERR_INVALID;
cd80958d
DG
674 }
675
53efb85a 676 memset(&lsm, 0, sizeof(lsm));
cd80958d 677 lsm.cmd_type = LTTNG_START_TRACE;
6a4f824d 678
cac3069d
DG
679 lttng_ctl_copy_string(lsm.session.name, session_name,
680 sizeof(lsm.session.name));
cd80958d 681
cac3069d 682 return lttng_ctl_ask_sessiond(&lsm, NULL);
f3ed775e 683}
1df4dedd
DG
684
685/*
38ee087f 686 * Stop tracing for all traces of the session.
f3ed775e 687 */
38ee087f 688static int _lttng_stop_tracing(const char *session_name, int wait)
f3ed775e 689{
38ee087f 690 int ret, data_ret;
cd80958d
DG
691 struct lttcomm_session_msg lsm;
692
6a4f824d 693 if (session_name == NULL) {
2f70b271 694 return -LTTNG_ERR_INVALID;
6a4f824d
DG
695 }
696
53efb85a 697 memset(&lsm, 0, sizeof(lsm));
cd80958d 698 lsm.cmd_type = LTTNG_STOP_TRACE;
6a4f824d 699
cac3069d
DG
700 lttng_ctl_copy_string(lsm.session.name, session_name,
701 sizeof(lsm.session.name));
cd80958d 702
cac3069d 703 ret = lttng_ctl_ask_sessiond(&lsm, NULL);
38ee087f
DG
704 if (ret < 0 && ret != -LTTNG_ERR_TRACE_ALREADY_STOPPED) {
705 goto error;
706 }
707
708 if (!wait) {
709 goto end;
710 }
711
38ee087f
DG
712 /* Check for data availability */
713 do {
6d805429 714 data_ret = lttng_data_pending(session_name);
38ee087f
DG
715 if (data_ret < 0) {
716 /* Return the data available call error. */
717 ret = data_ret;
718 goto error;
719 }
720
721 /*
9ae110e2
JG
722 * Data sleep time before retrying (in usec). Don't sleep if the
723 * call returned value indicates availability.
38ee087f 724 */
6d805429 725 if (data_ret) {
38ee087f 726 usleep(DEFAULT_DATA_AVAILABILITY_WAIT_TIME);
38ee087f 727 }
6d805429 728 } while (data_ret != 0);
38ee087f 729
38ee087f
DG
730end:
731error:
732 return ret;
733}
734
735/*
736 * Stop tracing and wait for data availability.
737 */
738int lttng_stop_tracing(const char *session_name)
739{
740 return _lttng_stop_tracing(session_name, 1);
741}
742
743/*
744 * Stop tracing but _don't_ wait for data availability.
745 */
746int lttng_stop_tracing_no_wait(const char *session_name)
747{
748 return _lttng_stop_tracing(session_name, 0);
f3ed775e
DG
749}
750
751/*
601d5acf
DG
752 * Add context to a channel.
753 *
754 * If the given channel is NULL, add the contexts to all channels.
755 * The event_name param is ignored.
af87c45a
DG
756 *
757 * Returns the size of the returned payload data or a negative error code.
1df4dedd 758 */
cd80958d 759int lttng_add_context(struct lttng_handle *handle,
38057ed1
DG
760 struct lttng_event_context *ctx, const char *event_name,
761 const char *channel_name)
d65106b1 762{
2001793c
JG
763 int ret;
764 size_t len = 0;
765 char *buf = NULL;
cd80958d
DG
766 struct lttcomm_session_msg lsm;
767
9ae110e2 768 /* Safety check. Both are mandatory. */
9d697d3d 769 if (handle == NULL || ctx == NULL) {
2001793c
JG
770 ret = -LTTNG_ERR_INVALID;
771 goto end;
cd80958d
DG
772 }
773
441c16a7 774 memset(&lsm, 0, sizeof(lsm));
cd80958d
DG
775 lsm.cmd_type = LTTNG_ADD_CONTEXT;
776
85076754
MD
777 /* If no channel name, send empty string. */
778 if (channel_name == NULL) {
779 lttng_ctl_copy_string(lsm.u.context.channel_name, "",
780 sizeof(lsm.u.context.channel_name));
781 } else {
782 lttng_ctl_copy_string(lsm.u.context.channel_name, channel_name,
783 sizeof(lsm.u.context.channel_name));
784 }
cd80958d 785
cac3069d 786 lttng_ctl_copy_lttng_domain(&lsm.domain, &handle->domain);
cac3069d 787 lttng_ctl_copy_string(lsm.session.name, handle->session_name,
cd80958d
DG
788 sizeof(lsm.session.name));
789
2001793c
JG
790 if (ctx->ctx == LTTNG_EVENT_CONTEXT_APP_CONTEXT) {
791 size_t provider_len, ctx_len;
792 const char *provider_name = ctx->u.app_ctx.provider_name;
793 const char *ctx_name = ctx->u.app_ctx.ctx_name;
794
795 if (!provider_name || !ctx_name) {
796 ret = -LTTNG_ERR_INVALID;
797 goto end;
798 }
799
800 provider_len = strlen(provider_name);
801 if (provider_len == 0) {
802 ret = -LTTNG_ERR_INVALID;
803 goto end;
804 }
805 lsm.u.context.provider_name_len = provider_len;
806
807 ctx_len = strlen(ctx_name);
808 if (ctx_len == 0) {
809 ret = -LTTNG_ERR_INVALID;
810 goto end;
811 }
812 lsm.u.context.context_name_len = ctx_len;
813
814 len = provider_len + ctx_len;
815 buf = zmalloc(len);
816 if (!buf) {
817 ret = -LTTNG_ERR_NOMEM;
818 goto end;
819 }
820
821 memcpy(buf, provider_name, provider_len);
822 memcpy(buf + provider_len, ctx_name, ctx_len);
823 }
824 memcpy(&lsm.u.context.ctx, ctx, sizeof(struct lttng_event_context));
46f44e2a
JR
825
826 if (ctx->ctx == LTTNG_EVENT_CONTEXT_APP_CONTEXT) {
827 /*
828 * Don't leak application addresses to the sessiond.
829 * This is only necessary when ctx is for an app ctx otherwise
830 * the values inside the union (type & config) are overwritten.
831 */
832 lsm.u.context.ctx.u.app_ctx.provider_name = NULL;
833 lsm.u.context.ctx.u.app_ctx.ctx_name = NULL;
834 }
2001793c 835
795a978d 836 ret = lttng_ctl_ask_sessiond_varlen_no_cmd_header(&lsm, buf, len, NULL);
2001793c
JG
837end:
838 free(buf);
839 return ret;
d65106b1
DG
840}
841
f3ed775e 842/*
9ae110e2
JG
843 * Enable event(s) for a channel.
844 *
845 * If no event name is specified, all events are enabled.
846 * If no channel name is specified, the default 'channel0' is used.
847 *
848 * Returns size of returned session payload data or a negative error code.
f3ed775e 849 */
cd80958d 850int lttng_enable_event(struct lttng_handle *handle,
38057ed1 851 struct lttng_event *ev, const char *channel_name)
1df4dedd 852{
f8a96544
JI
853 return lttng_enable_event_with_exclusions(handle, ev, channel_name,
854 NULL, 0, NULL);
1df4dedd
DG
855}
856
53a80697 857/*
025faf73 858 * Create or enable an event with a filter expression.
178191b3 859 *
53a80697
MD
860 * Return negative error value on error.
861 * Return size of returned session payload data if OK.
862 */
025faf73 863int lttng_enable_event_with_filter(struct lttng_handle *handle,
178191b3 864 struct lttng_event *event, const char *channel_name,
53a80697
MD
865 const char *filter_expression)
866{
f8a96544
JI
867 return lttng_enable_event_with_exclusions(handle, event, channel_name,
868 filter_expression, 0, NULL);
53a80697
MD
869}
870
347c5ab5 871/*
0e115563 872 * Depending on the event, return a newly allocated agent filter expression or
347c5ab5
DG
873 * NULL if not applicable.
874 *
875 * An event with NO loglevel and the name is * will return NULL.
876 */
0e115563 877static char *set_agent_filter(const char *filter, struct lttng_event *ev)
347c5ab5
DG
878{
879 int err;
0e115563 880 char *agent_filter = NULL;
347c5ab5
DG
881
882 assert(ev);
883
884 /* Don't add filter for the '*' event. */
9f449915 885 if (strcmp(ev->name, "*") != 0) {
347c5ab5 886 if (filter) {
0e115563 887 err = asprintf(&agent_filter, "(%s) && (logger_name == \"%s\")", filter,
347c5ab5
DG
888 ev->name);
889 } else {
0e115563 890 err = asprintf(&agent_filter, "logger_name == \"%s\"", ev->name);
347c5ab5
DG
891 }
892 if (err < 0) {
893 PERROR("asprintf");
6a556f7b 894 goto error;
347c5ab5
DG
895 }
896 }
897
898 /* Add loglevel filtering if any for the JUL domain. */
899 if (ev->loglevel_type != LTTNG_EVENT_LOGLEVEL_ALL) {
900 char *op;
901
902 if (ev->loglevel_type == LTTNG_EVENT_LOGLEVEL_RANGE) {
903 op = ">=";
904 } else {
905 op = "==";
906 }
907
0e115563 908 if (filter || agent_filter) {
6a556f7b
JG
909 char *new_filter;
910
fb0edb23 911 err = asprintf(&new_filter, "(%s) && (int_loglevel %s %d)",
0e115563 912 agent_filter ? agent_filter : filter, op,
347c5ab5 913 ev->loglevel);
0e115563
DG
914 if (agent_filter) {
915 free(agent_filter);
6a556f7b 916 }
0e115563 917 agent_filter = new_filter;
347c5ab5 918 } else {
0e115563 919 err = asprintf(&agent_filter, "int_loglevel %s %d", op,
347c5ab5
DG
920 ev->loglevel);
921 }
922 if (err < 0) {
923 PERROR("asprintf");
6a556f7b 924 goto error;
347c5ab5
DG
925 }
926 }
927
0e115563 928 return agent_filter;
6a556f7b 929error:
0e115563 930 free(agent_filter);
6a556f7b 931 return NULL;
347c5ab5
DG
932}
933
137b9942 934/*
ec166985 935 * Generate the filter bytecode from a given filter expression string. Put the
137b9942
DG
936 * newly allocated parser context in ctxp and populate the lsm object with the
937 * expression len.
938 *
939 * Return 0 on success else a LTTNG_ERR_* code and ctxp is untouched.
940 */
941static int generate_filter(char *filter_expression,
942 struct lttcomm_session_msg *lsm, struct filter_parser_ctx **ctxp)
943{
944 int ret;
945 struct filter_parser_ctx *ctx = NULL;
946 FILE *fmem = NULL;
947
948 assert(filter_expression);
949 assert(lsm);
950 assert(ctxp);
951
952 /*
953 * Casting const to non-const, as the underlying function will use it in
954 * read-only mode.
955 */
956 fmem = lttng_fmemopen((void *) filter_expression,
957 strlen(filter_expression), "r");
958 if (!fmem) {
959 fprintf(stderr, "Error opening memory as stream\n");
960 ret = -LTTNG_ERR_FILTER_NOMEM;
961 goto error;
962 }
963 ctx = filter_parser_ctx_alloc(fmem);
964 if (!ctx) {
965 fprintf(stderr, "Error allocating parser\n");
966 ret = -LTTNG_ERR_FILTER_NOMEM;
967 goto filter_alloc_error;
968 }
969 ret = filter_parser_ctx_append_ast(ctx);
970 if (ret) {
971 fprintf(stderr, "Parse error\n");
972 ret = -LTTNG_ERR_FILTER_INVAL;
973 goto parse_error;
974 }
137b9942
DG
975 if (print_xml) {
976 ret = filter_visitor_print_xml(ctx, stdout, 0);
977 if (ret) {
978 fflush(stdout);
979 fprintf(stderr, "XML print error\n");
980 ret = -LTTNG_ERR_FILTER_INVAL;
981 goto parse_error;
982 }
983 }
984
985 dbg_printf("Generating IR... ");
986 fflush(stdout);
987 ret = filter_visitor_ir_generate(ctx);
988 if (ret) {
989 fprintf(stderr, "Generate IR error\n");
990 ret = -LTTNG_ERR_FILTER_INVAL;
991 goto parse_error;
992 }
993 dbg_printf("done\n");
994
995 dbg_printf("Validating IR... ");
996 fflush(stdout);
997 ret = filter_visitor_ir_check_binary_op_nesting(ctx);
998 if (ret) {
999 ret = -LTTNG_ERR_FILTER_INVAL;
1000 goto parse_error;
1001 }
9f449915
PP
1002
1003 /* Normalize globbing patterns in the expression. */
1004 ret = filter_visitor_ir_normalize_glob_patterns(ctx);
1005 if (ret) {
1006 ret = -LTTNG_ERR_FILTER_INVAL;
1007 goto parse_error;
1008 }
1009
9ae110e2 1010 /* Validate strings used as literals in the expression. */
dcd5daf2
JG
1011 ret = filter_visitor_ir_validate_string(ctx);
1012 if (ret) {
1013 ret = -LTTNG_ERR_FILTER_INVAL;
1014 goto parse_error;
1015 }
9f449915
PP
1016
1017 /* Validate globbing patterns in the expression. */
1018 ret = filter_visitor_ir_validate_globbing(ctx);
1019 if (ret) {
1020 ret = -LTTNG_ERR_FILTER_INVAL;
1021 goto parse_error;
1022 }
1023
137b9942
DG
1024 dbg_printf("done\n");
1025
1026 dbg_printf("Generating bytecode... ");
1027 fflush(stdout);
1028 ret = filter_visitor_bytecode_generate(ctx);
1029 if (ret) {
1030 fprintf(stderr, "Generate bytecode error\n");
1031 ret = -LTTNG_ERR_FILTER_INVAL;
1032 goto parse_error;
1033 }
1034 dbg_printf("done\n");
1035 dbg_printf("Size of bytecode generated: %u bytes.\n",
1036 bytecode_get_len(&ctx->bytecode->b));
1037
1038 lsm->u.enable.bytecode_len = sizeof(ctx->bytecode->b)
1039 + bytecode_get_len(&ctx->bytecode->b);
1040 lsm->u.enable.expression_len = strlen(filter_expression) + 1;
1041
1042 /* No need to keep the memory stream. */
1043 if (fclose(fmem) != 0) {
6f04ed72 1044 PERROR("fclose");
137b9942
DG
1045 }
1046
1047 *ctxp = ctx;
1048 return 0;
1049
1050parse_error:
137b9942
DG
1051 filter_ir_free(ctx);
1052 filter_parser_ctx_free(ctx);
1053filter_alloc_error:
1054 if (fclose(fmem) != 0) {
6f04ed72 1055 PERROR("fclose");
137b9942
DG
1056 }
1057error:
1058 return ret;
1059}
1060
93deb080
JI
1061/*
1062 * Enable event(s) for a channel, possibly with exclusions and a filter.
1063 * If no event name is specified, all events are enabled.
1064 * If no channel name is specified, the default name is used.
1065 * If filter expression is not NULL, the filter is set for the event.
1066 * If exclusion count is not zero, the exclusions are set for the event.
1067 * Returns size of returned session payload data or a negative error code.
1068 */
1069int lttng_enable_event_with_exclusions(struct lttng_handle *handle,
1070 struct lttng_event *ev, const char *channel_name,
e9efbcd3 1071 const char *original_filter_expression,
93deb080
JI
1072 int exclusion_count, char **exclusion_list)
1073{
1074 struct lttcomm_session_msg lsm;
15e37663
JG
1075 struct lttng_dynamic_buffer send_buffer;
1076 int ret = 0, i, fd_to_send = -1;
1077 bool send_fd = false;
137b9942 1078 unsigned int free_filter_expression = 0;
93deb080 1079 struct filter_parser_ctx *ctx = NULL;
ec005ec6 1080
6a0838b7
YL
1081 /*
1082 * We have either a filter or some exclusions, so we need to set up
1083 * a variable-length memory block from where to send the data.
1084 */
1085 lttng_dynamic_buffer_init(&send_buffer);
ec005ec6 1086
e9efbcd3
JG
1087 /*
1088 * Cast as non-const since we may replace the filter expression
1089 * by a dynamically allocated string. Otherwise, the original
1090 * string is not modified.
1091 */
1092 char *filter_expression = (char *) original_filter_expression;
93deb080
JI
1093
1094 if (handle == NULL || ev == NULL) {
137b9942
DG
1095 ret = -LTTNG_ERR_INVALID;
1096 goto error;
93deb080
JI
1097 }
1098
9ae110e2
JG
1099 /*
1100 * Empty filter string will always be rejected by the parser
93deb080
JI
1101 * anyway, so treat this corner-case early to eliminate
1102 * lttng_fmemopen error for 0-byte allocation.
1103 */
1104 if (filter_expression && filter_expression[0] == '\0') {
137b9942
DG
1105 ret = -LTTNG_ERR_INVALID;
1106 goto error;
93deb080
JI
1107 }
1108
1109 memset(&lsm, 0, sizeof(lsm));
1110
1111 /* If no channel name, send empty string. */
1112 if (channel_name == NULL) {
1113 lttng_ctl_copy_string(lsm.u.enable.channel_name, "",
1114 sizeof(lsm.u.enable.channel_name));
1115 } else {
1116 lttng_ctl_copy_string(lsm.u.enable.channel_name, channel_name,
1117 sizeof(lsm.u.enable.channel_name));
1118 }
1119
18a720cd
MD
1120 lsm.cmd_type = LTTNG_ENABLE_EVENT;
1121 if (ev->name[0] == '\0') {
1122 /* Enable all events */
1123 lttng_ctl_copy_string(ev->name, "*", sizeof(ev->name));
6565421f 1124 }
93deb080 1125
6565421f 1126 lttng_ctl_copy_lttng_domain(&lsm.domain, &handle->domain);
6e911cad 1127 /* FIXME: copying non-packed struct to packed struct. */
93deb080
JI
1128 memcpy(&lsm.u.enable.event, ev, sizeof(lsm.u.enable.event));
1129
1130 lttng_ctl_copy_string(lsm.session.name, handle->session_name,
1131 sizeof(lsm.session.name));
1132 lsm.u.enable.exclusion_count = exclusion_count;
1133 lsm.u.enable.bytecode_len = 0;
1134
9ae110e2 1135 /* Parse filter expression. */
5cdb6027 1136 if (filter_expression != NULL || handle->domain.type == LTTNG_DOMAIN_JUL
0e115563
DG
1137 || handle->domain.type == LTTNG_DOMAIN_LOG4J
1138 || handle->domain.type == LTTNG_DOMAIN_PYTHON) {
5cdb6027 1139 if (handle->domain.type == LTTNG_DOMAIN_JUL ||
0e115563
DG
1140 handle->domain.type == LTTNG_DOMAIN_LOG4J ||
1141 handle->domain.type == LTTNG_DOMAIN_PYTHON) {
1142 char *agent_filter;
64226865 1143
347c5ab5 1144 /* Setup JUL filter if needed. */
0e115563
DG
1145 agent_filter = set_agent_filter(filter_expression, ev);
1146 if (!agent_filter) {
137b9942 1147 if (!filter_expression) {
9ae110e2
JG
1148 /*
1149 * No JUL and no filter, just skip
1150 * everything below.
1151 */
137b9942
DG
1152 goto ask_sessiond;
1153 }
64226865
DG
1154 } else {
1155 /*
9ae110e2
JG
1156 * With an agent filter, the original filter has
1157 * been added to it thus replace the filter
1158 * expression.
64226865 1159 */
0e115563 1160 filter_expression = agent_filter;
e9efbcd3 1161 free_filter_expression = 1;
9b21e6d5 1162 }
9b21e6d5 1163 }
93deb080 1164
137b9942 1165 ret = generate_filter(filter_expression, &lsm, &ctx);
93deb080 1166 if (ret) {
137b9942 1167 goto filter_error;
93deb080 1168 }
6b453b5e
JG
1169 }
1170
15e37663
JG
1171 ret = lttng_dynamic_buffer_set_capacity(&send_buffer,
1172 lsm.u.enable.bytecode_len
137b9942
DG
1173 + lsm.u.enable.expression_len
1174 + LTTNG_SYMBOL_NAME_LEN * exclusion_count);
15e37663 1175 if (ret) {
6b453b5e 1176 ret = -LTTNG_ERR_EXCLUSION_NOMEM;
7ca1dc6f 1177 goto mem_error;
6b453b5e 1178 }
137b9942 1179
9ae110e2 1180 /* Put exclusion names first in the data. */
15e37663
JG
1181 for (i = 0; i < exclusion_count; i++) {
1182 size_t exclusion_len;
1183
1184 exclusion_len = lttng_strnlen(*(exclusion_list + i),
1185 LTTNG_SYMBOL_NAME_LEN);
1186 if (exclusion_len == LTTNG_SYMBOL_NAME_LEN) {
1187 /* Exclusion is not NULL-terminated. */
1188 ret = -LTTNG_ERR_INVALID;
1189 goto mem_error;
1190 }
1191
1192 ret = lttng_dynamic_buffer_append(&send_buffer,
1193 *(exclusion_list + i),
1194 LTTNG_SYMBOL_NAME_LEN);
1195 if (ret) {
1196 goto mem_error;
1197 }
6b453b5e 1198 }
15e37663 1199
9ae110e2 1200 /* Add filter expression next. */
15e37663
JG
1201 if (filter_expression) {
1202 ret = lttng_dynamic_buffer_append(&send_buffer,
1203 filter_expression, lsm.u.enable.expression_len);
1204 if (ret) {
1205 goto mem_error;
1206 }
6b453b5e 1207 }
9ae110e2 1208 /* Add filter bytecode next. */
137b9942 1209 if (ctx && lsm.u.enable.bytecode_len != 0) {
15e37663
JG
1210 ret = lttng_dynamic_buffer_append(&send_buffer,
1211 &ctx->bytecode->b, lsm.u.enable.bytecode_len);
1212 if (ret) {
1213 goto mem_error;
1214 }
1215 }
1216 if (ev->extended.ptr) {
1217 struct lttng_event_extended *ev_ext =
1218 (struct lttng_event_extended *) ev->extended.ptr;
1219
1220 if (ev_ext->probe_location) {
1221 /*
1222 * lttng_userspace_probe_location_serialize returns the
1223 * number of bytes that was appended to the buffer.
1224 */
1225 ret = lttng_userspace_probe_location_serialize(
1226 ev_ext->probe_location, &send_buffer,
1227 &fd_to_send);
56f0bc67 1228 if (ret < 0) {
15e37663
JG
1229 goto mem_error;
1230 }
1231
1232 send_fd = fd_to_send >= 0;
1233 /*
1234 * Set the size of the userspace probe location element
1235 * of the buffer so that the receiving side knows where
1236 * to split it.
1237 */
1238 lsm.u.enable.userspace_probe_location_len = ret;
1239 }
93deb080
JI
1240 }
1241
15e37663
JG
1242 ret = lttng_ctl_ask_sessiond_fds_varlen(&lsm,
1243 send_fd ? &fd_to_send : NULL,
1244 send_fd ? 1 : 0,
1245 send_buffer.size ? send_buffer.data : NULL,
1246 send_buffer.size, NULL, NULL, 0);
93deb080 1247
7ca1dc6f
DG
1248mem_error:
1249 if (filter_expression && ctx) {
93deb080
JI
1250 filter_bytecode_free(ctx);
1251 filter_ir_free(ctx);
1252 filter_parser_ctx_free(ctx);
7ca1dc6f
DG
1253 }
1254filter_error:
1255 if (free_filter_expression) {
1256 /*
9ae110e2
JG
1257 * The filter expression has been replaced and must be freed as
1258 * it is not the original filter expression received as a
1259 * parameter.
7ca1dc6f
DG
1260 */
1261 free(filter_expression);
93deb080 1262 }
137b9942
DG
1263error:
1264 /*
9ae110e2
JG
1265 * Return directly to the caller and don't ask the sessiond since
1266 * something went wrong in the parsing of data above.
137b9942 1267 */
15e37663 1268 lttng_dynamic_buffer_reset(&send_buffer);
93deb080 1269 return ret;
3e1c9ff7
DG
1270
1271ask_sessiond:
1272 ret = lttng_ctl_ask_sessiond(&lsm, NULL);
1273 return ret;
93deb080
JI
1274}
1275
6e911cad
MD
1276int lttng_disable_event_ext(struct lttng_handle *handle,
1277 struct lttng_event *ev, const char *channel_name,
1278 const char *original_filter_expression)
1df4dedd 1279{
cd80958d 1280 struct lttcomm_session_msg lsm;
6e911cad
MD
1281 char *varlen_data;
1282 int ret = 0;
1283 unsigned int free_filter_expression = 0;
1284 struct filter_parser_ctx *ctx = NULL;
1285 /*
1286 * Cast as non-const since we may replace the filter expression
1287 * by a dynamically allocated string. Otherwise, the original
1288 * string is not modified.
1289 */
1290 char *filter_expression = (char *) original_filter_expression;
1df4dedd 1291
6e911cad
MD
1292 if (handle == NULL || ev == NULL) {
1293 ret = -LTTNG_ERR_INVALID;
1294 goto error;
1295 }
1296
9ae110e2
JG
1297 /*
1298 * Empty filter string will always be rejected by the parser
6e911cad
MD
1299 * anyway, so treat this corner-case early to eliminate
1300 * lttng_fmemopen error for 0-byte allocation.
1301 */
1302 if (filter_expression && filter_expression[0] == '\0') {
1303 ret = -LTTNG_ERR_INVALID;
1304 goto error;
cd80958d
DG
1305 }
1306
441c16a7
MD
1307 memset(&lsm, 0, sizeof(lsm));
1308
85076754
MD
1309 /* If no channel name, send empty string. */
1310 if (channel_name == NULL) {
1311 lttng_ctl_copy_string(lsm.u.disable.channel_name, "",
cd80958d 1312 sizeof(lsm.u.disable.channel_name));
f3ed775e 1313 } else {
85076754 1314 lttng_ctl_copy_string(lsm.u.disable.channel_name, channel_name,
cd80958d 1315 sizeof(lsm.u.disable.channel_name));
eb354453
DG
1316 }
1317
18a720cd 1318 lsm.cmd_type = LTTNG_DISABLE_EVENT;
f3ed775e 1319
6e911cad
MD
1320 lttng_ctl_copy_lttng_domain(&lsm.domain, &handle->domain);
1321 /* FIXME: copying non-packed struct to packed struct. */
1322 memcpy(&lsm.u.disable.event, ev, sizeof(lsm.u.disable.event));
1323
cac3069d 1324 lttng_ctl_copy_string(lsm.session.name, handle->session_name,
cd80958d 1325 sizeof(lsm.session.name));
6e911cad 1326 lsm.u.disable.bytecode_len = 0;
cd80958d 1327
6e911cad
MD
1328 /*
1329 * For the JUL domain, a filter is enforced except for the
1330 * disable all event. This is done to avoid having the event in
1331 * all sessions thus filtering by logger name.
1332 */
1333 if (filter_expression == NULL &&
1334 (handle->domain.type != LTTNG_DOMAIN_JUL &&
0e115563
DG
1335 handle->domain.type != LTTNG_DOMAIN_LOG4J &&
1336 handle->domain.type != LTTNG_DOMAIN_PYTHON)) {
6e911cad
MD
1337 goto ask_sessiond;
1338 }
1339
1340 /*
1341 * We have a filter, so we need to set up a variable-length
1342 * memory block from where to send the data.
1343 */
1344
1345 /* Parse filter expression */
1346 if (filter_expression != NULL || handle->domain.type == LTTNG_DOMAIN_JUL
0e115563
DG
1347 || handle->domain.type == LTTNG_DOMAIN_LOG4J
1348 || handle->domain.type == LTTNG_DOMAIN_PYTHON) {
6e911cad 1349 if (handle->domain.type == LTTNG_DOMAIN_JUL ||
0e115563
DG
1350 handle->domain.type == LTTNG_DOMAIN_LOG4J ||
1351 handle->domain.type == LTTNG_DOMAIN_PYTHON) {
1352 char *agent_filter;
6e911cad
MD
1353
1354 /* Setup JUL filter if needed. */
0e115563
DG
1355 agent_filter = set_agent_filter(filter_expression, ev);
1356 if (!agent_filter) {
6e911cad 1357 if (!filter_expression) {
9ae110e2
JG
1358 /*
1359 * No JUL and no filter, just skip
1360 * everything below.
1361 */
6e911cad
MD
1362 goto ask_sessiond;
1363 }
1364 } else {
1365 /*
9ae110e2
JG
1366 * With a JUL filter, the original filter has
1367 * been added to it thus replace the filter
1368 * expression.
6e911cad 1369 */
0e115563 1370 filter_expression = agent_filter;
6e911cad
MD
1371 free_filter_expression = 1;
1372 }
1373 }
1374
1375 ret = generate_filter(filter_expression, &lsm, &ctx);
1376 if (ret) {
1377 goto filter_error;
1378 }
1379 }
1380
1381 varlen_data = zmalloc(lsm.u.disable.bytecode_len
1382 + lsm.u.disable.expression_len);
1383 if (!varlen_data) {
1384 ret = -LTTNG_ERR_EXCLUSION_NOMEM;
1385 goto mem_error;
1386 }
1387
9ae110e2 1388 /* Add filter expression. */
6e911cad
MD
1389 if (lsm.u.disable.expression_len != 0) {
1390 memcpy(varlen_data,
1391 filter_expression,
1392 lsm.u.disable.expression_len);
1393 }
9ae110e2 1394 /* Add filter bytecode next. */
6e911cad
MD
1395 if (ctx && lsm.u.disable.bytecode_len != 0) {
1396 memcpy(varlen_data
1397 + lsm.u.disable.expression_len,
1398 &ctx->bytecode->b,
1399 lsm.u.disable.bytecode_len);
1400 }
1401
795a978d 1402 ret = lttng_ctl_ask_sessiond_varlen_no_cmd_header(&lsm, varlen_data,
6e911cad
MD
1403 lsm.u.disable.bytecode_len + lsm.u.disable.expression_len, NULL);
1404 free(varlen_data);
1405
1406mem_error:
1407 if (filter_expression && ctx) {
1408 filter_bytecode_free(ctx);
1409 filter_ir_free(ctx);
1410 filter_parser_ctx_free(ctx);
1411 }
1412filter_error:
1413 if (free_filter_expression) {
1414 /*
9ae110e2
JG
1415 * The filter expression has been replaced and must be freed as
1416 * it is not the original filter expression received as a
1417 * parameter.
6e911cad
MD
1418 */
1419 free(filter_expression);
1420 }
1421error:
1422 /*
9ae110e2
JG
1423 * Return directly to the caller and don't ask the sessiond since
1424 * something went wrong in the parsing of data above.
6e911cad
MD
1425 */
1426 return ret;
1427
1428ask_sessiond:
1429 ret = lttng_ctl_ask_sessiond(&lsm, NULL);
1430 return ret;
1431}
1432
1433/*
9ae110e2
JG
1434 * Disable event(s) of a channel and domain.
1435 * If no event name is specified, all events are disabled.
1436 * If no channel name is specified, the default 'channel0' is used.
1437 * Returns size of returned session payload data or a negative error code.
6e911cad
MD
1438 */
1439int lttng_disable_event(struct lttng_handle *handle, const char *name,
1440 const char *channel_name)
1441{
1442 struct lttng_event ev;
1443
1444 memset(&ev, 0, sizeof(ev));
9b7431cf 1445 ev.loglevel = -1;
6e911cad
MD
1446 ev.type = LTTNG_EVENT_ALL;
1447 lttng_ctl_copy_string(ev.name, name, sizeof(ev.name));
1448 return lttng_disable_event_ext(handle, &ev, channel_name, NULL);
1df4dedd
DG
1449}
1450
cf0bcb51
JG
1451struct lttng_channel *lttng_channel_create(struct lttng_domain *domain)
1452{
1453 struct lttng_channel *channel = NULL;
1454 struct lttng_channel_extended *extended = NULL;
1455
1456 if (!domain) {
1457 goto error;
1458 }
1459
1460 /* Validate domain. */
1461 switch (domain->type) {
1462 case LTTNG_DOMAIN_UST:
1463 switch (domain->buf_type) {
1464 case LTTNG_BUFFER_PER_UID:
1465 case LTTNG_BUFFER_PER_PID:
1466 break;
1467 default:
1468 goto error;
1469 }
1470 break;
1471 case LTTNG_DOMAIN_KERNEL:
1472 if (domain->buf_type != LTTNG_BUFFER_GLOBAL) {
1473 goto error;
1474 }
1475 break;
1476 default:
1477 goto error;
1478 }
1479
1480 channel = zmalloc(sizeof(*channel));
1481 if (!channel) {
1482 goto error;
1483 }
1484
1485 extended = zmalloc(sizeof(*extended));
1486 if (!extended) {
1487 goto error;
1488 }
1489
1490 channel->attr.extended.ptr = extended;
1491
1492 lttng_channel_set_default_attr(domain, &channel->attr);
1493 return channel;
1494error:
1495 free(channel);
1496 free(extended);
1497 return NULL;
1498}
1499
1500void lttng_channel_destroy(struct lttng_channel *channel)
1501{
1502 if (!channel) {
1503 return;
1504 }
1505
1506 if (channel->attr.extended.ptr) {
1507 free(channel->attr.extended.ptr);
1508 }
1509 free(channel);
1510}
1511
1df4dedd 1512/*
9ae110e2
JG
1513 * Enable channel per domain
1514 * Returns size of returned session payload data or a negative error code.
a5c5a2bd 1515 */
cd80958d 1516int lttng_enable_channel(struct lttng_handle *handle,
cf0bcb51 1517 struct lttng_channel *in_chan)
a5c5a2bd 1518{
cd80958d 1519 struct lttcomm_session_msg lsm;
09b72f7a 1520 size_t total_buffer_size_needed_per_cpu = 0;
cd80958d 1521
9ae110e2 1522 /* NULL arguments are forbidden. No default values. */
cf0bcb51 1523 if (handle == NULL || in_chan == NULL) {
2f70b271 1524 return -LTTNG_ERR_INVALID;
cd80958d
DG
1525 }
1526
441c16a7 1527 memset(&lsm, 0, sizeof(lsm));
cf0bcb51
JG
1528 memcpy(&lsm.u.channel.chan, in_chan, sizeof(lsm.u.channel.chan));
1529 lsm.u.channel.chan.attr.extended.ptr = NULL;
441c16a7 1530
cf0bcb51
JG
1531 if (!in_chan->attr.extended.ptr) {
1532 struct lttng_channel *channel;
1533 struct lttng_channel_extended *extended;
7d29a247 1534
cf0bcb51
JG
1535 channel = lttng_channel_create(&handle->domain);
1536 if (!channel) {
1537 return -LTTNG_ERR_NOMEM;
1538 }
1539
1540 /*
1541 * Create a new channel in order to use default extended
1542 * attribute values.
1543 */
1544 extended = (struct lttng_channel_extended *)
1545 channel->attr.extended.ptr;
1546 memcpy(&lsm.u.channel.extended, extended, sizeof(*extended));
1547 lttng_channel_destroy(channel);
1548 } else {
1549 struct lttng_channel_extended *extended;
1550
1551 extended = (struct lttng_channel_extended *)
1552 in_chan->attr.extended.ptr;
1553 memcpy(&lsm.u.channel.extended, extended, sizeof(*extended));
1554 }
cd80958d 1555
09b72f7a
FD
1556 /*
1557 * Verify that the amount of memory required to create the requested
1558 * buffer is available on the system at the moment.
1559 */
1560 total_buffer_size_needed_per_cpu = lsm.u.channel.chan.attr.num_subbuf *
1561 lsm.u.channel.chan.attr.subbuf_size;
1562 if (!check_enough_available_memory(total_buffer_size_needed_per_cpu)) {
1563 return -LTTNG_ERR_NOMEM;
1564 }
1565
cf0bcb51 1566 lsm.cmd_type = LTTNG_ENABLE_CHANNEL;
cac3069d 1567 lttng_ctl_copy_lttng_domain(&lsm.domain, &handle->domain);
7d29a247 1568
cac3069d 1569 lttng_ctl_copy_string(lsm.session.name, handle->session_name,
cd80958d
DG
1570 sizeof(lsm.session.name));
1571
cac3069d 1572 return lttng_ctl_ask_sessiond(&lsm, NULL);
8c0faa1d 1573}
1df4dedd 1574
2ef84c95 1575/*
9ae110e2
JG
1576 * All tracing will be stopped for registered events of the channel.
1577 * Returns size of returned session payload data or a negative error code.
2ef84c95 1578 */
cd80958d 1579int lttng_disable_channel(struct lttng_handle *handle, const char *name)
2ef84c95 1580{
cd80958d
DG
1581 struct lttcomm_session_msg lsm;
1582
9ae110e2 1583 /* Safety check. Both are mandatory. */
9d697d3d 1584 if (handle == NULL || name == NULL) {
2f70b271 1585 return -LTTNG_ERR_INVALID;
cd80958d
DG
1586 }
1587
441c16a7
MD
1588 memset(&lsm, 0, sizeof(lsm));
1589
cd80958d 1590 lsm.cmd_type = LTTNG_DISABLE_CHANNEL;
1df4dedd 1591
cac3069d 1592 lttng_ctl_copy_string(lsm.u.disable.channel_name, name,
9d697d3d
DG
1593 sizeof(lsm.u.disable.channel_name));
1594
cac3069d 1595 lttng_ctl_copy_lttng_domain(&lsm.domain, &handle->domain);
cd80958d 1596
cac3069d 1597 lttng_ctl_copy_string(lsm.session.name, handle->session_name,
cd80958d
DG
1598 sizeof(lsm.session.name));
1599
cac3069d 1600 return lttng_ctl_ask_sessiond(&lsm, NULL);
ca95a216
DG
1601}
1602
ccf10263 1603/*
9ae110e2
JG
1604 * Add PID to session tracker.
1605 * Return 0 on success else a negative LTTng error code.
ccf10263
MD
1606 */
1607int lttng_track_pid(struct lttng_handle *handle, int pid)
1608{
1609 struct lttcomm_session_msg lsm;
1610
9ae110e2 1611 /* NULL arguments are forbidden. No default values. */
ccf10263
MD
1612 if (handle == NULL) {
1613 return -LTTNG_ERR_INVALID;
1614 }
1615
1616 memset(&lsm, 0, sizeof(lsm));
1617
1618 lsm.cmd_type = LTTNG_TRACK_PID;
1619 lsm.u.pid_tracker.pid = pid;
1620
1621 lttng_ctl_copy_lttng_domain(&lsm.domain, &handle->domain);
1622
1623 lttng_ctl_copy_string(lsm.session.name, handle->session_name,
1624 sizeof(lsm.session.name));
1625
1626 return lttng_ctl_ask_sessiond(&lsm, NULL);
1627}
1628
1629/*
9ae110e2
JG
1630 * Remove PID from session tracker.
1631 * Return 0 on success else a negative LTTng error code.
ccf10263
MD
1632 */
1633int lttng_untrack_pid(struct lttng_handle *handle, int pid)
1634{
1635 struct lttcomm_session_msg lsm;
1636
9ae110e2 1637 /* NULL arguments are forbidden. No default values. */
ccf10263
MD
1638 if (handle == NULL) {
1639 return -LTTNG_ERR_INVALID;
1640 }
1641
1642 memset(&lsm, 0, sizeof(lsm));
1643
1644 lsm.cmd_type = LTTNG_UNTRACK_PID;
1645 lsm.u.pid_tracker.pid = pid;
1646
1647 lttng_ctl_copy_lttng_domain(&lsm.domain, &handle->domain);
1648
1649 lttng_ctl_copy_string(lsm.session.name, handle->session_name,
1650 sizeof(lsm.session.name));
1651
1652 return lttng_ctl_ask_sessiond(&lsm, NULL);
1653}
1654
fac6795d 1655/*
9ae110e2
JG
1656 * Lists all available tracepoints of domain.
1657 * Sets the contents of the events array.
1658 * Returns the number of lttng_event entries in events;
1659 * on error, returns a negative value.
fac6795d 1660 */
cd80958d 1661int lttng_list_tracepoints(struct lttng_handle *handle,
2a71efd5 1662 struct lttng_event **events)
fac6795d 1663{
052da939 1664 int ret;
cd80958d
DG
1665 struct lttcomm_session_msg lsm;
1666
9d697d3d 1667 if (handle == NULL) {
2f70b271 1668 return -LTTNG_ERR_INVALID;
cd80958d 1669 }
fac6795d 1670
53efb85a 1671 memset(&lsm, 0, sizeof(lsm));
cd80958d 1672 lsm.cmd_type = LTTNG_LIST_TRACEPOINTS;
cac3069d 1673 lttng_ctl_copy_lttng_domain(&lsm.domain, &handle->domain);
2a71efd5 1674
cac3069d 1675 ret = lttng_ctl_ask_sessiond(&lsm, (void **) events);
052da939
DG
1676 if (ret < 0) {
1677 return ret;
eb354453 1678 }
fac6795d 1679
9f19cc17 1680 return ret / sizeof(struct lttng_event);
fac6795d
DG
1681}
1682
f37d259d 1683/*
9ae110e2
JG
1684 * Lists all available tracepoint fields of domain.
1685 * Sets the contents of the event field array.
1686 * Returns the number of lttng_event_field entries in events;
1687 * on error, returns a negative value.
f37d259d
MD
1688 */
1689int lttng_list_tracepoint_fields(struct lttng_handle *handle,
1690 struct lttng_event_field **fields)
1691{
1692 int ret;
1693 struct lttcomm_session_msg lsm;
1694
1695 if (handle == NULL) {
2f70b271 1696 return -LTTNG_ERR_INVALID;
f37d259d
MD
1697 }
1698
53efb85a 1699 memset(&lsm, 0, sizeof(lsm));
f37d259d 1700 lsm.cmd_type = LTTNG_LIST_TRACEPOINT_FIELDS;
cac3069d 1701 lttng_ctl_copy_lttng_domain(&lsm.domain, &handle->domain);
f37d259d 1702
cac3069d 1703 ret = lttng_ctl_ask_sessiond(&lsm, (void **) fields);
f37d259d
MD
1704 if (ret < 0) {
1705 return ret;
1706 }
1707
1708 return ret / sizeof(struct lttng_event_field);
1709}
1710
834978fd 1711/*
9ae110e2
JG
1712 * Lists all available kernel system calls. Allocates and sets the contents of
1713 * the events array.
834978fd 1714 *
9ae110e2
JG
1715 * Returns the number of lttng_event entries in events; on error, returns a
1716 * negative value.
834978fd
DG
1717 */
1718int lttng_list_syscalls(struct lttng_event **events)
1719{
1720 int ret;
1721 struct lttcomm_session_msg lsm;
1722
1723 if (!events) {
1724 return -LTTNG_ERR_INVALID;
1725 }
1726
1727 memset(&lsm, 0, sizeof(lsm));
1728 lsm.cmd_type = LTTNG_LIST_SYSCALLS;
1729 /* Force kernel domain for system calls. */
1730 lsm.domain.type = LTTNG_DOMAIN_KERNEL;
1731
1732 ret = lttng_ctl_ask_sessiond(&lsm, (void **) events);
1733 if (ret < 0) {
1734 return ret;
1735 }
1736
1737 return ret / sizeof(struct lttng_event);
1738}
1739
1657e9bb 1740/*
9ae110e2
JG
1741 * Returns a human readable string describing
1742 * the error code (a negative value).
1657e9bb 1743 */
9a745bc7 1744const char *lttng_strerror(int code)
1657e9bb 1745{
f73fabfd 1746 return error_get_str(code);
1657e9bb
DG
1747}
1748
b178f53e
JG
1749enum lttng_error_code lttng_create_session_ext(
1750 struct lttng_session_descriptor *session_descriptor)
1751{
1752 enum lttng_error_code ret_code;
1753 struct lttcomm_session_msg lsm = {
1754 .cmd_type = LTTNG_CREATE_SESSION_EXT,
1755 };
1756 void *reply = NULL;
1757 struct lttng_buffer_view reply_view;
1758 int reply_ret;
1759 bool sessiond_must_generate_ouput;
1760 struct lttng_dynamic_buffer payload;
1761 int ret;
1762 size_t descriptor_size;
1763 struct lttng_session_descriptor *descriptor_reply = NULL;
1764
1765 lttng_dynamic_buffer_init(&payload);
1766 if (!session_descriptor) {
1767 ret_code = LTTNG_ERR_INVALID;
1768 goto end;
1769 }
1770
1771 sessiond_must_generate_ouput =
1772 !lttng_session_descriptor_is_output_destination_initialized(
1773 session_descriptor);
1774 if (sessiond_must_generate_ouput) {
1775 const char *home_dir = utils_get_home_dir();
1776 size_t home_dir_len = home_dir ? strlen(home_dir) + 1 : 0;
1777
1778 if (!home_dir || home_dir_len > LTTNG_PATH_MAX) {
1779 ret_code = LTTNG_ERR_FATAL;
1780 goto end;
1781 }
1782
1783 lsm.u.create_session.home_dir_size = (uint16_t) home_dir_len;
1784 ret = lttng_dynamic_buffer_append(&payload, home_dir,
1785 home_dir_len);
1786 if (ret) {
1787 ret_code = LTTNG_ERR_NOMEM;
1788 goto end;
1789 }
1790 }
1791
1792 descriptor_size = payload.size;
1793 ret = lttng_session_descriptor_serialize(session_descriptor,
1794 &payload);
1795 if (ret) {
1796 ret_code = LTTNG_ERR_INVALID;
1797 goto end;
1798 }
1799 descriptor_size = payload.size - descriptor_size;
1800 lsm.u.create_session.session_descriptor_size = descriptor_size;
1801
1802 /* Command returns a session descriptor on success. */
1803 reply_ret = lttng_ctl_ask_sessiond_varlen_no_cmd_header(&lsm, payload.data,
1804 payload.size, &reply);
1805 if (reply_ret < 0) {
1806 ret_code = -reply_ret;
1807 goto end;
1808 } else if (reply_ret == 0) {
1809 /* Socket unexpectedly closed by the session daemon. */
1810 ret_code = LTTNG_ERR_FATAL;
1811 goto end;
1812 }
1813
1814 reply_view = lttng_buffer_view_init(reply, 0, reply_ret);
1815 ret = lttng_session_descriptor_create_from_buffer(&reply_view,
1816 &descriptor_reply);
1817 if (ret < 0) {
1818 ret_code = LTTNG_ERR_FATAL;
1819 goto end;
1820 }
1821 ret_code = LTTNG_OK;
1822 lttng_session_descriptor_assign(session_descriptor, descriptor_reply);
1823end:
1824 free(reply);
1825 lttng_dynamic_buffer_reset(&payload);
1826 lttng_session_descriptor_destroy(descriptor_reply);
1827 return ret_code;
1828}
1829
aaf97519 1830/*
b178f53e 1831 * Create a new session using name and url for destination.
a4b92340 1832 *
f73fabfd 1833 * Returns LTTNG_OK on success or a negative error code.
00e2e675 1834 */
a4b92340 1835int lttng_create_session(const char *name, const char *url)
00e2e675 1836{
3dd05a85 1837 int ret;
a4b92340 1838 ssize_t size;
a4b92340 1839 struct lttng_uri *uris = NULL;
b178f53e
JG
1840 struct lttng_session_descriptor *descriptor = NULL;
1841 enum lttng_error_code ret_code;
00e2e675 1842
b178f53e
JG
1843 if (!name) {
1844 ret = -LTTNG_ERR_INVALID;
1845 goto end;
00e2e675
DG
1846 }
1847
bc894455 1848 size = uri_parse_str_urls(url, NULL, &uris);
a4b92340 1849 if (size < 0) {
b178f53e
JG
1850 ret = -LTTNG_ERR_INVALID;
1851 goto end;
1852 }
1853 switch (size) {
1854 case 0:
1855 descriptor = lttng_session_descriptor_create(name);
1856 break;
1857 case 1:
1858 if (uris[0].dtype != LTTNG_DST_PATH) {
1859 ret = -LTTNG_ERR_INVALID;
1860 goto end;
1861 }
1862 descriptor = lttng_session_descriptor_local_create(name,
1863 uris[0].dst.path);
1864 break;
1865 case 2:
1866 descriptor = lttng_session_descriptor_network_create(name, url,
1867 NULL);
1868 break;
1869 default:
1870 ret = -LTTNG_ERR_INVALID;
1871 goto end;
1872 }
1873 if (!descriptor) {
1874 ret = -LTTNG_ERR_INVALID;
1875 goto end;
00e2e675 1876 }
b178f53e
JG
1877 ret_code = lttng_create_session_ext(descriptor);
1878 ret = ret_code == LTTNG_OK ? 0 : -ret_code;
1879end:
1880 lttng_session_descriptor_destroy(descriptor);
1881 free(uris);
1882 return ret;
1883}
00e2e675 1884
b178f53e
JG
1885/*
1886 * Create a session exclusively used for snapshot.
1887 *
1888 * Returns LTTNG_OK on success or a negative error code.
1889 */
1890int lttng_create_session_snapshot(const char *name, const char *snapshot_url)
1891{
1892 int ret;
1893 enum lttng_error_code ret_code;
1894 ssize_t size;
1895 struct lttng_uri *uris = NULL;
1896 struct lttng_session_descriptor *descriptor = NULL;
a4b92340 1897
b178f53e
JG
1898 if (!name) {
1899 ret = -LTTNG_ERR_INVALID;
1900 goto end;
1901 }
1902
1903 size = uri_parse_str_urls(snapshot_url, NULL, &uris);
1904 if (size < 0) {
1905 ret = -LTTNG_ERR_INVALID;
1906 goto end;
1907 }
1908 /*
1909 * If the user does not specify a custom subdir, use the session name.
1910 */
1911 if (size > 0 && uris[0].dtype != LTTNG_DST_PATH &&
1912 strlen(uris[0].subdir) == 0) {
1913 ret = snprintf(uris[0].subdir, sizeof(uris[0].subdir), "%s",
1914 name);
1915 if (ret < 0) {
1916 PERROR("Failed to set session name as network destination sub-directory");
1917 ret = -LTTNG_ERR_FATAL;
1918 goto end;
1919 } else if (ret >= sizeof(uris[0].subdir)) {
1920 /* Truncated output. */
1921 ret = -LTTNG_ERR_INVALID;
1922 goto end;
1923 }
1924 }
3dd05a85 1925
b178f53e
JG
1926 switch (size) {
1927 case 0:
1928 descriptor = lttng_session_descriptor_snapshot_create(name);
1929 break;
1930 case 1:
1931 if (uris[0].dtype != LTTNG_DST_PATH) {
1932 ret = -LTTNG_ERR_INVALID;
1933 goto end;
1934 }
1935 descriptor = lttng_session_descriptor_snapshot_local_create(
1936 name,
1937 uris[0].dst.path);
1938 break;
1939 case 2:
1940 descriptor = lttng_session_descriptor_snapshot_network_create(
1941 name,
1942 snapshot_url,
1943 NULL);
1944 break;
1945 default:
1946 ret = -LTTNG_ERR_INVALID;
1947 goto end;
1948 }
1949 if (!descriptor) {
1950 ret = -LTTNG_ERR_INVALID;
1951 goto end;
1952 }
1953 ret_code = lttng_create_session_ext(descriptor);
1954 ret = ret_code == LTTNG_OK ? 0 : -ret_code;
1955end:
1956 lttng_session_descriptor_destroy(descriptor);
3dd05a85
DG
1957 free(uris);
1958 return ret;
00e2e675
DG
1959}
1960
b178f53e
JG
1961/*
1962 * Create a session exclusively used for live.
1963 *
1964 * Returns LTTNG_OK on success or a negative error code.
1965 */
1966int lttng_create_session_live(const char *name, const char *url,
1967 unsigned int timer_interval)
1968{
1969 int ret;
1970 enum lttng_error_code ret_code;
1971 struct lttng_session_descriptor *descriptor = NULL;
1972
1973 if (!name) {
1974 ret = -LTTNG_ERR_INVALID;
1975 goto end;
1976 }
1977
1978 if (url) {
1979 descriptor = lttng_session_descriptor_live_network_create(
1980 name, url, NULL, timer_interval);
1981 } else {
1982 descriptor = lttng_session_descriptor_live_create(
1983 name, timer_interval);
1984 }
1985 if (!descriptor) {
1986 ret = -LTTNG_ERR_INVALID;
1987 goto end;
1988 }
1989 ret_code = lttng_create_session_ext(descriptor);
1990 ret = ret_code == LTTNG_OK ? 0 : -ret_code;
1991end:
1992 lttng_session_descriptor_destroy(descriptor);
1993 return ret;
1994}
1995
8028d920 1996/*
9ae110e2
JG
1997 * Destroy session using name.
1998 * Returns size of returned session payload data or a negative error code.
8028d920 1999 */
8fd2c92c 2000static
e20ee7c2 2001int _lttng_destroy_session(const char *session_name)
8028d920 2002{
cd80958d
DG
2003 struct lttcomm_session_msg lsm;
2004
843f5df9 2005 if (session_name == NULL) {
2f70b271 2006 return -LTTNG_ERR_INVALID;
cd80958d
DG
2007 }
2008
53efb85a 2009 memset(&lsm, 0, sizeof(lsm));
cd80958d 2010 lsm.cmd_type = LTTNG_DESTROY_SESSION;
843f5df9 2011
cac3069d
DG
2012 lttng_ctl_copy_string(lsm.session.name, session_name,
2013 sizeof(lsm.session.name));
cd80958d 2014
cac3069d 2015 return lttng_ctl_ask_sessiond(&lsm, NULL);
aaf97519
DG
2016}
2017
e20ee7c2
JD
2018/*
2019 * Stop the session and wait for the data before destroying it
2020 */
2021int lttng_destroy_session(const char *session_name)
2022{
2023 int ret;
2024
2025 /*
2026 * Stop the tracing and wait for the data.
2027 */
2028 ret = _lttng_stop_tracing(session_name, 1);
2029 if (ret && ret != -LTTNG_ERR_TRACE_ALREADY_STOPPED) {
2030 goto end;
2031 }
2032
2033 ret = _lttng_destroy_session(session_name);
2034end:
2035 return ret;
2036}
2037
2038/*
2039 * Destroy the session without waiting for the data.
2040 */
2041int lttng_destroy_session_no_wait(const char *session_name)
2042{
2043 int ret;
2044
2045 /*
2046 * Stop the tracing without waiting for the data.
2047 * The session might already have been stopped, so just
2048 * skip this error.
2049 */
2050 ret = _lttng_stop_tracing(session_name, 0);
2051 if (ret && ret != -LTTNG_ERR_TRACE_ALREADY_STOPPED) {
2052 goto end;
2053 }
2054
2055 ret = _lttng_destroy_session(session_name);
2056end:
2057 return ret;
2058}
2059
57167058 2060/*
9ae110e2
JG
2061 * Ask the session daemon for all available sessions.
2062 * Sets the contents of the sessions array.
2063 * Returns the number of lttng_session entries in sessions;
2064 * on error, returns a negative value.
57167058 2065 */
b178f53e 2066int lttng_list_sessions(struct lttng_session **out_sessions)
57167058 2067{
ca95a216 2068 int ret;
cd80958d 2069 struct lttcomm_session_msg lsm;
b178f53e
JG
2070 const size_t session_size = sizeof(struct lttng_session) +
2071 sizeof(struct lttng_session_extended);
2072 size_t session_count, i;
2073 struct lttng_session_extended *sessions_extended_begin;
2074 struct lttng_session *sessions = NULL;
57167058 2075
53efb85a 2076 memset(&lsm, 0, sizeof(lsm));
cd80958d 2077 lsm.cmd_type = LTTNG_LIST_SESSIONS;
b178f53e
JG
2078 ret = lttng_ctl_ask_sessiond(&lsm, (void**) &sessions);
2079 if (ret <= 0) {
b178f53e
JG
2080 goto end;
2081 }
2082 if (!sessions) {
2083 ret = -LTTNG_ERR_FATAL;
2084 goto end;
2085 }
2086
2087 if (ret % session_size) {
2088 ret = -LTTNG_ERR_UNK;
2089 free(sessions);
2090 *out_sessions = NULL;
2091 goto end;
57167058 2092 }
b178f53e
JG
2093 session_count = (size_t) ret / session_size;
2094 sessions_extended_begin = (struct lttng_session_extended *)
2095 (&sessions[session_count]);
57167058 2096
b178f53e
JG
2097 /* Set extended session info pointers. */
2098 for (i = 0; i < session_count; i++) {
2099 struct lttng_session *session = &sessions[i];
2100 struct lttng_session_extended *extended =
2101 &(sessions_extended_begin[i]);
2102
2103 session->extended.ptr = extended;
2104 }
2105
2106 ret = (int) session_count;
2107 *out_sessions = sessions;
2108end:
2109 return ret;
2110}
2111
2112enum lttng_error_code lttng_session_get_creation_time(
2113 const struct lttng_session *session, uint64_t *creation_time)
2114{
2115 enum lttng_error_code ret = LTTNG_OK;
2116 struct lttng_session_extended *extended;
2117
2118 if (!session || !creation_time || !session->extended.ptr) {
2119 ret = LTTNG_ERR_INVALID;
2120 goto end;
2121 }
2122
2123 extended = session->extended.ptr;
2124 if (!extended->creation_time.is_set) {
2125 /* Not created on the session daemon yet. */
2126 ret = LTTNG_ERR_SESSION_NOT_EXIST;
2127 goto end;
2128 }
2129 *creation_time = extended->creation_time.value;
2130end:
2131 return ret;
57167058
DG
2132}
2133
d7ba1388
MD
2134int lttng_set_session_shm_path(const char *session_name,
2135 const char *shm_path)
2136{
2137 struct lttcomm_session_msg lsm;
2138
2139 if (session_name == NULL) {
2140 return -LTTNG_ERR_INVALID;
2141 }
2142
2143 memset(&lsm, 0, sizeof(lsm));
2144 lsm.cmd_type = LTTNG_SET_SESSION_SHM_PATH;
2145
2146 lttng_ctl_copy_string(lsm.session.name, session_name,
2147 sizeof(lsm.session.name));
2148 lttng_ctl_copy_string(lsm.u.set_shm_path.shm_path, shm_path,
2149 sizeof(lsm.u.set_shm_path.shm_path));
2150
2151 return lttng_ctl_ask_sessiond(&lsm, NULL);
2152}
2153
9f19cc17 2154/*
9ae110e2
JG
2155 * Ask the session daemon for all available domains of a session.
2156 * Sets the contents of the domains array.
2157 * Returns the number of lttng_domain entries in domains;
2158 * on error, returns a negative value.
9f19cc17 2159 */
330be774 2160int lttng_list_domains(const char *session_name,
cd80958d 2161 struct lttng_domain **domains)
9f19cc17
DG
2162{
2163 int ret;
cd80958d
DG
2164 struct lttcomm_session_msg lsm;
2165
330be774 2166 if (session_name == NULL) {
2f70b271 2167 return -LTTNG_ERR_INVALID;
cd80958d 2168 }
9f19cc17 2169
53efb85a 2170 memset(&lsm, 0, sizeof(lsm));
cd80958d
DG
2171 lsm.cmd_type = LTTNG_LIST_DOMAINS;
2172
cac3069d
DG
2173 lttng_ctl_copy_string(lsm.session.name, session_name,
2174 sizeof(lsm.session.name));
cd80958d 2175
cac3069d 2176 ret = lttng_ctl_ask_sessiond(&lsm, (void**) domains);
9f19cc17
DG
2177 if (ret < 0) {
2178 return ret;
2179 }
2180
2181 return ret / sizeof(struct lttng_domain);
2182}
2183
2184/*
9ae110e2
JG
2185 * Ask the session daemon for all available channels of a session.
2186 * Sets the contents of the channels array.
2187 * Returns the number of lttng_channel entries in channels;
2188 * on error, returns a negative value.
9f19cc17 2189 */
cd80958d
DG
2190int lttng_list_channels(struct lttng_handle *handle,
2191 struct lttng_channel **channels)
9f19cc17
DG
2192{
2193 int ret;
53e367f9
JG
2194 size_t channel_count, i;
2195 const size_t channel_size = sizeof(struct lttng_channel) +
cf0bcb51 2196 sizeof(struct lttng_channel_extended);
cd80958d 2197 struct lttcomm_session_msg lsm;
53e367f9 2198 void *extended_at;
cd80958d 2199
9d697d3d 2200 if (handle == NULL) {
53e367f9
JG
2201 ret = -LTTNG_ERR_INVALID;
2202 goto end;
cd80958d
DG
2203 }
2204
53efb85a 2205 memset(&lsm, 0, sizeof(lsm));
cd80958d 2206 lsm.cmd_type = LTTNG_LIST_CHANNELS;
cac3069d 2207 lttng_ctl_copy_string(lsm.session.name, handle->session_name,
cd80958d 2208 sizeof(lsm.session.name));
9f19cc17 2209
cac3069d 2210 lttng_ctl_copy_lttng_domain(&lsm.domain, &handle->domain);
9f19cc17 2211
cac3069d 2212 ret = lttng_ctl_ask_sessiond(&lsm, (void**) channels);
9f19cc17 2213 if (ret < 0) {
53e367f9
JG
2214 goto end;
2215 }
2216
2217 if (ret % channel_size) {
2218 ret = -LTTNG_ERR_UNK;
2219 free(*channels);
2220 *channels = NULL;
2221 goto end;
9f19cc17 2222 }
53e367f9 2223 channel_count = (size_t) ret / channel_size;
9f19cc17 2224
53e367f9
JG
2225 /* Set extended info pointers */
2226 extended_at = ((void *) *channels) +
2227 channel_count * sizeof(struct lttng_channel);
2228 for (i = 0; i < channel_count; i++) {
2229 struct lttng_channel *chan = &(*channels)[i];
2230
2231 chan->attr.extended.ptr = extended_at;
cf0bcb51 2232 extended_at += sizeof(struct lttng_channel_extended);
53e367f9
JG
2233 }
2234
2235 ret = (int) channel_count;
2236end:
2237 return ret;
9f19cc17
DG
2238}
2239
2240/*
9ae110e2
JG
2241 * Ask the session daemon for all available events of a session channel.
2242 * Sets the contents of the events array.
2243 * Returns the number of lttng_event entries in events;
2244 * on error, returns a negative value.
9f19cc17 2245 */
cd80958d
DG
2246int lttng_list_events(struct lttng_handle *handle,
2247 const char *channel_name, struct lttng_event **events)
9f19cc17
DG
2248{
2249 int ret;
cd80958d 2250 struct lttcomm_session_msg lsm;
b4e3ceb9
PP
2251 struct lttcomm_event_command_header *cmd_header = NULL;
2252 size_t cmd_header_len;
2253 uint32_t nb_events, i;
de453daa 2254 void *comm_ext_at;
de453daa 2255 char *reception_buffer = NULL;
56f0bc67 2256 struct lttng_dynamic_buffer listing;
de453daa 2257 size_t storage_req;
9f19cc17 2258
9d697d3d
DG
2259 /* Safety check. An handle and channel name are mandatory */
2260 if (handle == NULL || channel_name == NULL) {
2f70b271 2261 return -LTTNG_ERR_INVALID;
cd80958d
DG
2262 }
2263
53efb85a 2264 memset(&lsm, 0, sizeof(lsm));
cd80958d 2265 lsm.cmd_type = LTTNG_LIST_EVENTS;
cac3069d 2266 lttng_ctl_copy_string(lsm.session.name, handle->session_name,
cd80958d 2267 sizeof(lsm.session.name));
cac3069d 2268 lttng_ctl_copy_string(lsm.u.list.channel_name, channel_name,
cd80958d 2269 sizeof(lsm.u.list.channel_name));
cac3069d 2270 lttng_ctl_copy_lttng_domain(&lsm.domain, &handle->domain);
9f19cc17 2271
a04d53fc 2272 ret = lttng_ctl_ask_sessiond_fds_varlen(&lsm, NULL, 0, NULL, 0,
de453daa
JG
2273 (void **) &reception_buffer, (void **) &cmd_header,
2274 &cmd_header_len);
9f19cc17 2275 if (ret < 0) {
de453daa 2276 goto end;
9f19cc17
DG
2277 }
2278
d9f484bc
JG
2279 if (!cmd_header) {
2280 ret = -LTTNG_ERR_UNK;
2281 goto end;
2282 }
2283
b4e3ceb9
PP
2284 /* Set number of events and free command header */
2285 nb_events = cmd_header->nb_events;
2286 if (nb_events > INT_MAX) {
2287 ret = -EOVERFLOW;
de453daa 2288 goto end;
b4e3ceb9 2289 }
b4e3ceb9
PP
2290 free(cmd_header);
2291 cmd_header = NULL;
2292
de453daa
JG
2293 /*
2294 * The buffer that is returned must contain a "flat" version of
2295 * the events that are returned. In other words, all pointers
2296 * within an lttng_event must point to a location within the returned
56f0bc67
JG
2297 * buffer so that the user may free everything by simply calling free()
2298 * on the returned buffer. This is needed in order to maintain API
de453daa
JG
2299 * compatibility.
2300 *
56f0bc67
JG
2301 * A first pass is performed to compute the size of the buffer that
2302 * must be allocated. A second pass is then performed to setup
de453daa
JG
2303 * the returned events so that their members always point within the
2304 * buffer.
2305 *
2306 * The layout of the returned buffer is as follows:
2307 * - struct lttng_event[nb_events],
2308 * - nb_events times the following:
2309 * - struct lttng_event_extended,
2310 * - flattened version of userspace_probe_location
2311 * - filter_expression
2312 * - exclusions
2313 * - padding to align to 64-bits
2314 */
2315 comm_ext_at = reception_buffer +
2316 (nb_events * sizeof(struct lttng_event));
2317 storage_req = nb_events * sizeof(struct lttng_event);
b4e3ceb9
PP
2318
2319 for (i = 0; i < nb_events; i++) {
de453daa
JG
2320 struct lttcomm_event_extended_header *ext_comm =
2321 (struct lttcomm_event_extended_header *) comm_ext_at;
56f0bc67 2322 int probe_storage_req = 0;
b4e3ceb9 2323
de453daa
JG
2324 comm_ext_at += sizeof(*ext_comm);
2325 comm_ext_at += ext_comm->filter_len;
2326 comm_ext_at +=
2327 ext_comm->nb_exclusions * LTTNG_SYMBOL_NAME_LEN;
2328
56f0bc67
JG
2329 if (ext_comm->userspace_probe_location_len) {
2330 struct lttng_userspace_probe_location *probe_location = NULL;
2331 struct lttng_buffer_view probe_location_view;
2332
2333 probe_location_view = lttng_buffer_view_init(
2334 comm_ext_at, 0,
2335 ext_comm->userspace_probe_location_len);
2336
2337 /*
2338 * Create a temporary userspace probe location to
2339 * determine the size needed by a "flattened" version
2340 * of that same probe location.
2341 */
2342 ret = lttng_userspace_probe_location_create_from_buffer(
2343 &probe_location_view, &probe_location);
2344 if (ret < 0) {
2345 ret = -LTTNG_ERR_PROBE_LOCATION_INVAL;
2346 goto end;
2347 }
2348
2349 ret = lttng_userspace_probe_location_flatten(
2350 probe_location, NULL);
2351 lttng_userspace_probe_location_destroy(probe_location);
2352 if (ret < 0) {
2353 ret = -LTTNG_ERR_PROBE_LOCATION_INVAL;
2354 goto end;
2355 }
2356
2357 probe_storage_req = ret;
2358 comm_ext_at += ext_comm->userspace_probe_location_len;
56f0bc67
JG
2359 }
2360
de453daa 2361 storage_req += sizeof(struct lttng_event_extended);
de453daa
JG
2362 storage_req += ext_comm->filter_len;
2363 storage_req += ext_comm->nb_exclusions * LTTNG_SYMBOL_NAME_LEN;
56f0bc67
JG
2364 /* Padding to ensure the flat probe is aligned. */
2365 storage_req = ALIGN_TO(storage_req, sizeof(uint64_t));
2366 storage_req += probe_storage_req;
b4e3ceb9
PP
2367 }
2368
56f0bc67
JG
2369 lttng_dynamic_buffer_init(&listing);
2370 /*
2371 * We must ensure that "listing" is never resized so as to preserve
2372 * the validity of the flattened objects.
2373 */
2374 ret = lttng_dynamic_buffer_set_capacity(&listing, storage_req);
2375 if (ret) {
2376 ret = -LTTNG_ERR_NOMEM;
de453daa
JG
2377 goto end;
2378 }
56f0bc67
JG
2379
2380 ret = lttng_dynamic_buffer_append(&listing, reception_buffer,
2381 nb_events * sizeof(struct lttng_event));
2382 if (ret) {
2383 ret = -LTTNG_ERR_NOMEM;
2384 goto free_dynamic_buffer;
2385 }
de453daa
JG
2386
2387 comm_ext_at = reception_buffer +
56f0bc67 2388 (nb_events * sizeof(struct lttng_event));
de453daa
JG
2389 for (i = 0; i < nb_events; i++) {
2390 struct lttng_event *event = (struct lttng_event *)
56f0bc67 2391 (listing.data + (sizeof(struct lttng_event) * i));
de453daa
JG
2392 struct lttcomm_event_extended_header *ext_comm =
2393 (struct lttcomm_event_extended_header *) comm_ext_at;
2394 struct lttng_event_extended *event_extended =
56f0bc67
JG
2395 (struct lttng_event_extended *)
2396 (listing.data + listing.size);
de453daa 2397
56f0bc67
JG
2398 /* Insert struct lttng_event_extended. */
2399 ret = lttng_dynamic_buffer_set_size(&listing,
2400 listing.size + sizeof(*event_extended));
2401 if (ret) {
2402 ret = -LTTNG_ERR_NOMEM;
2403 goto free_dynamic_buffer;
2404 }
de453daa 2405 event->extended.ptr = event_extended;
56f0bc67 2406
de453daa
JG
2407 comm_ext_at += sizeof(*ext_comm);
2408
56f0bc67
JG
2409 /* Insert filter expression. */
2410 if (ext_comm->filter_len) {
2411 event_extended->filter_expression = listing.data +
2412 listing.size;
2413 ret = lttng_dynamic_buffer_append(&listing, comm_ext_at,
2414 ext_comm->filter_len);
2415 if (ret) {
2416 ret = -LTTNG_ERR_NOMEM;
2417 goto free_dynamic_buffer;
2418 }
2419 comm_ext_at += ext_comm->filter_len;
2420 }
2421
2422 /* Insert exclusions. */
2423 if (ext_comm->nb_exclusions) {
2424 event_extended->exclusions.count =
2425 ext_comm->nb_exclusions;
2426 event_extended->exclusions.strings =
2427 listing.data + listing.size;
2428
2429 ret = lttng_dynamic_buffer_append(&listing,
2430 comm_ext_at,
2431 ext_comm->nb_exclusions * LTTNG_SYMBOL_NAME_LEN);
2432 if (ret) {
2433 ret = -LTTNG_ERR_NOMEM;
5e4f4898 2434 goto free_dynamic_buffer;
56f0bc67
JG
2435 }
2436 comm_ext_at += ext_comm->nb_exclusions * LTTNG_SYMBOL_NAME_LEN;
2437 }
2438
2439 /* Insert padding to align to 64-bits. */
2440 ret = lttng_dynamic_buffer_set_size(&listing,
2441 ALIGN_TO(listing.size, sizeof(uint64_t)));
2442 if (ret) {
2443 ret = -LTTNG_ERR_NOMEM;
2444 goto free_dynamic_buffer;
2445 }
2446
2447 /* Insert flattened userspace probe location. */
2448 if (ext_comm->userspace_probe_location_len) {
2449 struct lttng_userspace_probe_location *probe_location = NULL;
2450 struct lttng_buffer_view probe_location_view;
de453daa 2451
56f0bc67
JG
2452 probe_location_view = lttng_buffer_view_init(
2453 comm_ext_at, 0,
2454 ext_comm->userspace_probe_location_len);
de453daa 2455
56f0bc67
JG
2456 ret = lttng_userspace_probe_location_create_from_buffer(
2457 &probe_location_view, &probe_location);
2458 if (ret < 0) {
2459 ret = -LTTNG_ERR_PROBE_LOCATION_INVAL;
2460 goto free_dynamic_buffer;
2461 }
2462
2463 event_extended->probe_location = (struct lttng_userspace_probe_location *)
2464 (listing.data + listing.size);
2465 ret = lttng_userspace_probe_location_flatten(
2466 probe_location, &listing);
2467 lttng_userspace_probe_location_destroy(probe_location);
2468 if (ret < 0) {
2469 ret = -LTTNG_ERR_PROBE_LOCATION_INVAL;
2470 goto free_dynamic_buffer;
2471 }
2472
2473 comm_ext_at += ext_comm->userspace_probe_location_len;
2474 }
de453daa
JG
2475 }
2476
56f0bc67
JG
2477 /* Don't reset listing buffer as we return its content. */
2478 *events = (struct lttng_event *) listing.data;
2479 lttng_dynamic_buffer_init(&listing);
de453daa 2480 ret = (int) nb_events;
56f0bc67
JG
2481free_dynamic_buffer:
2482 lttng_dynamic_buffer_reset(&listing);
de453daa 2483end:
b4e3ceb9 2484 free(cmd_header);
de453daa 2485 free(reception_buffer);
b4e3ceb9 2486 return ret;
9f19cc17
DG
2487}
2488
fac6795d 2489/*
1c8d13c8
TD
2490 * Sets the tracing_group variable with name.
2491 * This function allocates memory pointed to by tracing_group.
2492 * On success, returns 0, on error, returns -1 (null name) or -ENOMEM.
fac6795d
DG
2493 */
2494int lttng_set_tracing_group(const char *name)
2495{
9d697d3d 2496 if (name == NULL) {
2f70b271 2497 return -LTTNG_ERR_INVALID;
9d697d3d
DG
2498 }
2499
fac6795d 2500 if (asprintf(&tracing_group, "%s", name) < 0) {
2f70b271 2501 return -LTTNG_ERR_FATAL;
fac6795d
DG
2502 }
2503
2504 return 0;
2505}
2506
cd80958d 2507int lttng_calibrate(struct lttng_handle *handle,
d0254c7c
MD
2508 struct lttng_calibrate *calibrate)
2509{
b812e5ca
PP
2510 /*
2511 * This command was removed in LTTng 2.9.
2512 */
2513 return -LTTNG_ERR_UND;
d0254c7c
MD
2514}
2515
5edd7e09
DG
2516/*
2517 * Set default channel attributes.
441c16a7 2518 * If either or both of the arguments are null, attr content is zeroe'd.
5edd7e09
DG
2519 */
2520void lttng_channel_set_default_attr(struct lttng_domain *domain,
2521 struct lttng_channel_attr *attr)
2522{
294851b0 2523 struct lttng_channel_extended *extended;
cf0bcb51 2524
5edd7e09
DG
2525 /* Safety check */
2526 if (attr == NULL || domain == NULL) {
2527 return;
2528 }
2529
294851b0 2530 extended = (struct lttng_channel_extended *) attr->extended.ptr;
eacaa7a6
DS
2531 memset(attr, 0, sizeof(struct lttng_channel_attr));
2532
0a9c6494
DG
2533 /* Same for all domains. */
2534 attr->overwrite = DEFAULT_CHANNEL_OVERWRITE;
2535 attr->tracefile_size = DEFAULT_CHANNEL_TRACEFILE_SIZE;
2536 attr->tracefile_count = DEFAULT_CHANNEL_TRACEFILE_COUNT;
2537
5edd7e09
DG
2538 switch (domain->type) {
2539 case LTTNG_DOMAIN_KERNEL:
9ae110e2
JG
2540 attr->switch_timer_interval =
2541 DEFAULT_KERNEL_CHANNEL_SWITCH_TIMER;
d92ff3ef 2542 attr->read_timer_interval = DEFAULT_KERNEL_CHANNEL_READ_TIMER;
3e230f92 2543 attr->subbuf_size = default_get_kernel_channel_subbuf_size();
5edd7e09
DG
2544 attr->num_subbuf = DEFAULT_KERNEL_CHANNEL_SUBBUF_NUM;
2545 attr->output = DEFAULT_KERNEL_CHANNEL_OUTPUT;
cf0bcb51
JG
2546 if (extended) {
2547 extended->monitor_timer_interval =
2548 DEFAULT_KERNEL_CHANNEL_MONITOR_TIMER;
491d1539
MD
2549 extended->blocking_timeout =
2550 DEFAULT_KERNEL_CHANNEL_BLOCKING_TIMEOUT;
cf0bcb51 2551 }
5edd7e09
DG
2552 break;
2553 case LTTNG_DOMAIN_UST:
0a9c6494
DG
2554 switch (domain->buf_type) {
2555 case LTTNG_BUFFER_PER_UID:
2556 attr->subbuf_size = default_get_ust_uid_channel_subbuf_size();
2557 attr->num_subbuf = DEFAULT_UST_UID_CHANNEL_SUBBUF_NUM;
2558 attr->output = DEFAULT_UST_UID_CHANNEL_OUTPUT;
9ae110e2
JG
2559 attr->switch_timer_interval =
2560 DEFAULT_UST_UID_CHANNEL_SWITCH_TIMER;
2561 attr->read_timer_interval =
2562 DEFAULT_UST_UID_CHANNEL_READ_TIMER;
cf0bcb51
JG
2563 if (extended) {
2564 extended->monitor_timer_interval =
2565 DEFAULT_UST_UID_CHANNEL_MONITOR_TIMER;
491d1539
MD
2566 extended->blocking_timeout =
2567 DEFAULT_UST_UID_CHANNEL_BLOCKING_TIMEOUT;
cf0bcb51 2568 }
0a9c6494
DG
2569 break;
2570 case LTTNG_BUFFER_PER_PID:
2571 default:
2572 attr->subbuf_size = default_get_ust_pid_channel_subbuf_size();
2573 attr->num_subbuf = DEFAULT_UST_PID_CHANNEL_SUBBUF_NUM;
2574 attr->output = DEFAULT_UST_PID_CHANNEL_OUTPUT;
9ae110e2
JG
2575 attr->switch_timer_interval =
2576 DEFAULT_UST_PID_CHANNEL_SWITCH_TIMER;
2577 attr->read_timer_interval =
2578 DEFAULT_UST_PID_CHANNEL_READ_TIMER;
cf0bcb51
JG
2579 if (extended) {
2580 extended->monitor_timer_interval =
2581 DEFAULT_UST_PID_CHANNEL_MONITOR_TIMER;
491d1539
MD
2582 extended->blocking_timeout =
2583 DEFAULT_UST_PID_CHANNEL_BLOCKING_TIMEOUT;
cf0bcb51 2584 }
0a9c6494
DG
2585 break;
2586 }
5edd7e09 2587 default:
441c16a7 2588 /* Default behavior: leave set to 0. */
5edd7e09
DG
2589 break;
2590 }
cf0bcb51
JG
2591
2592 attr->extended.ptr = extended;
5edd7e09
DG
2593}
2594
5ba3702f
JG
2595int lttng_channel_get_discarded_event_count(struct lttng_channel *channel,
2596 uint64_t *discarded_events)
2597{
2598 int ret = 0;
cf0bcb51 2599 struct lttng_channel_extended *chan_ext;
5ba3702f
JG
2600
2601 if (!channel || !discarded_events) {
2602 ret = -LTTNG_ERR_INVALID;
2603 goto end;
2604 }
2605
2606 chan_ext = channel->attr.extended.ptr;
2607 if (!chan_ext) {
2608 /*
2609 * This can happen since the lttng_channel structure is
2610 * used for other tasks where this pointer is never set.
2611 */
2612 *discarded_events = 0;
2613 goto end;
2614 }
2615
2616 *discarded_events = chan_ext->discarded_events;
2617end:
2618 return ret;
2619}
2620
2621int lttng_channel_get_lost_packet_count(struct lttng_channel *channel,
2622 uint64_t *lost_packets)
2623{
2624 int ret = 0;
cf0bcb51 2625 struct lttng_channel_extended *chan_ext;
5ba3702f
JG
2626
2627 if (!channel || !lost_packets) {
2628 ret = -LTTNG_ERR_INVALID;
2629 goto end;
2630 }
2631
2632 chan_ext = channel->attr.extended.ptr;
2633 if (!chan_ext) {
2634 /*
2635 * This can happen since the lttng_channel structure is
2636 * used for other tasks where this pointer is never set.
2637 */
2638 *lost_packets = 0;
2639 goto end;
2640 }
2641
2642 *lost_packets = chan_ext->lost_packets;
2643end:
2644 return ret;
2645}
2646
cf0bcb51
JG
2647int lttng_channel_get_monitor_timer_interval(struct lttng_channel *chan,
2648 uint64_t *monitor_timer_interval)
2649{
2650 int ret = 0;
2651
2652 if (!chan || !monitor_timer_interval) {
2653 ret = -LTTNG_ERR_INVALID;
2654 goto end;
2655 }
2656
2657 if (!chan->attr.extended.ptr) {
2658 ret = -LTTNG_ERR_INVALID;
2659 goto end;
2660 }
2661
2662 *monitor_timer_interval = ((struct lttng_channel_extended *)
2663 chan->attr.extended.ptr)->monitor_timer_interval;
2664end:
2665 return ret;
2666}
2667
2668int lttng_channel_set_monitor_timer_interval(struct lttng_channel *chan,
2669 uint64_t monitor_timer_interval)
2670{
2671 int ret = 0;
2672
2673 if (!chan || !chan->attr.extended.ptr) {
2674 ret = -LTTNG_ERR_INVALID;
2675 goto end;
2676 }
2677
2678 ((struct lttng_channel_extended *)
2679 chan->attr.extended.ptr)->monitor_timer_interval =
2680 monitor_timer_interval;
2681end:
2682 return ret;
2683}
2684
491d1539
MD
2685int lttng_channel_get_blocking_timeout(struct lttng_channel *chan,
2686 int64_t *blocking_timeout)
2687{
2688 int ret = 0;
2689
2690 if (!chan || !blocking_timeout) {
2691 ret = -LTTNG_ERR_INVALID;
2692 goto end;
2693 }
2694
2695 if (!chan->attr.extended.ptr) {
2696 ret = -LTTNG_ERR_INVALID;
2697 goto end;
2698 }
2699
2700 *blocking_timeout = ((struct lttng_channel_extended *)
2701 chan->attr.extended.ptr)->blocking_timeout;
2702end:
2703 return ret;
2704}
2705
2706int lttng_channel_set_blocking_timeout(struct lttng_channel *chan,
2707 int64_t blocking_timeout)
2708{
2709 int ret = 0;
2710 int64_t msec_timeout;
2711
2712 if (!chan || !chan->attr.extended.ptr) {
2713 ret = -LTTNG_ERR_INVALID;
2714 goto end;
2715 }
2716
2717 if (blocking_timeout < 0 && blocking_timeout != -1) {
2718 ret = -LTTNG_ERR_INVALID;
2719 goto end;
2720 }
2721
2722 /*
2723 * LTTng-ust's use of poll() to implement this timeout mechanism forces
2724 * us to accept a narrower range of values (msecs expressed as a signed
2725 * 32-bit integer).
2726 */
2727 msec_timeout = blocking_timeout / 1000;
2728 if (msec_timeout != (int32_t) msec_timeout) {
2729 ret = -LTTNG_ERR_INVALID;
2730 goto end;
2731 }
2732
2733 ((struct lttng_channel_extended *)
2734 chan->attr.extended.ptr)->blocking_timeout =
2735 blocking_timeout;
2736end:
2737 return ret;
2738}
2739
fac6795d 2740/*
2269e89e 2741 * Check if session daemon is alive.
fac6795d 2742 *
2269e89e 2743 * Return 1 if alive or 0 if not.
1c8d13c8 2744 * On error returns a negative value.
fac6795d 2745 */
947308c4 2746int lttng_session_daemon_alive(void)
fac6795d
DG
2747{
2748 int ret;
2749
2750 ret = set_session_daemon_path();
2751 if (ret < 0) {
9ae110e2 2752 /* Error. */
fac6795d
DG
2753 return ret;
2754 }
2755
9d035200 2756 if (*sessiond_sock_path == '\0') {
2f70b271 2757 /*
9ae110e2
JG
2758 * No socket path set. Weird error which means the constructor
2759 * was not called.
2f70b271
DG
2760 */
2761 assert(0);
fac6795d
DG
2762 }
2763
2269e89e 2764 ret = try_connect_sessiond(sessiond_sock_path);
7d8234d9 2765 if (ret < 0) {
9ae110e2 2766 /* Not alive. */
7d8234d9
MD
2767 return 0;
2768 }
7d8234d9 2769
9ae110e2 2770 /* Is alive. */
947308c4 2771 return 1;
fac6795d
DG
2772}
2773
00e2e675 2774/*
a4b92340 2775 * Set URL for a consumer for a session and domain.
00e2e675
DG
2776 *
2777 * Return 0 on success, else a negative value.
2778 */
a4b92340
DG
2779int lttng_set_consumer_url(struct lttng_handle *handle,
2780 const char *control_url, const char *data_url)
00e2e675 2781{
3dd05a85 2782 int ret;
a4b92340 2783 ssize_t size;
00e2e675 2784 struct lttcomm_session_msg lsm;
a4b92340 2785 struct lttng_uri *uris = NULL;
00e2e675 2786
a4b92340 2787 if (handle == NULL || (control_url == NULL && data_url == NULL)) {
2f70b271 2788 return -LTTNG_ERR_INVALID;
00e2e675
DG
2789 }
2790
a4b92340
DG
2791 memset(&lsm, 0, sizeof(lsm));
2792
00e2e675
DG
2793 lsm.cmd_type = LTTNG_SET_CONSUMER_URI;
2794
cac3069d 2795 lttng_ctl_copy_string(lsm.session.name, handle->session_name,
00e2e675 2796 sizeof(lsm.session.name));
cac3069d 2797 lttng_ctl_copy_lttng_domain(&lsm.domain, &handle->domain);
00e2e675 2798
bc894455 2799 size = uri_parse_str_urls(control_url, data_url, &uris);
a4b92340 2800 if (size < 0) {
2f70b271 2801 return -LTTNG_ERR_INVALID;
a4b92340
DG
2802 }
2803
2804 lsm.u.uri.size = size;
00e2e675 2805
795a978d 2806 ret = lttng_ctl_ask_sessiond_varlen_no_cmd_header(&lsm, uris,
cac3069d 2807 sizeof(struct lttng_uri) * size, NULL);
3dd05a85
DG
2808
2809 free(uris);
2810 return ret;
00e2e675
DG
2811}
2812
2813/*
9c6bda17 2814 * [OBSOLETE]
00e2e675
DG
2815 */
2816int lttng_enable_consumer(struct lttng_handle *handle)
2817{
785d2d0d 2818 return -ENOSYS;
00e2e675
DG
2819}
2820
2821/*
9c6bda17 2822 * [OBSOLETE]
00e2e675
DG
2823 */
2824int lttng_disable_consumer(struct lttng_handle *handle)
2825{
785d2d0d 2826 return -ENOSYS;
00e2e675
DG
2827}
2828
07424f16 2829/*
b178f53e 2830 * [OBSOLETE]
07424f16
DG
2831 */
2832int _lttng_create_session_ext(const char *name, const char *url,
2833 const char *datetime)
2834{
b178f53e 2835 return -ENOSYS;
07424f16
DG
2836}
2837
806e2684
DG
2838/*
2839 * For a given session name, this call checks if the data is ready to be read
2840 * or is still being extracted by the consumer(s) hence not ready to be used by
2841 * any readers.
2842 */
6d805429 2843int lttng_data_pending(const char *session_name)
806e2684
DG
2844{
2845 int ret;
2846 struct lttcomm_session_msg lsm;
f6151c55 2847 uint8_t *pending = NULL;
806e2684
DG
2848
2849 if (session_name == NULL) {
2850 return -LTTNG_ERR_INVALID;
2851 }
2852
53efb85a 2853 memset(&lsm, 0, sizeof(lsm));
6d805429 2854 lsm.cmd_type = LTTNG_DATA_PENDING;
806e2684 2855
cac3069d
DG
2856 lttng_ctl_copy_string(lsm.session.name, session_name,
2857 sizeof(lsm.session.name));
806e2684 2858
f6151c55
JG
2859 ret = lttng_ctl_ask_sessiond(&lsm, (void **) &pending);
2860 if (ret < 0) {
2861 goto end;
2862 } else if (ret != 1) {
2863 /* Unexpected payload size */
2864 ret = -LTTNG_ERR_INVALID;
2865 goto end;
806e2684
DG
2866 }
2867
f6151c55
JG
2868 ret = (int) *pending;
2869end:
2870 free(pending);
806e2684
DG
2871 return ret;
2872}
2873
a5dfbb9d
MD
2874/*
2875 * List PIDs in the tracker.
2876 *
1b18ce93
JG
2877 * enabled is set to whether the PID tracker is enabled.
2878 * pids is set to an allocated array of PIDs currently tracked. On
2879 * success, pids must be freed by the caller.
2880 * nr_pids is set to the number of entries contained by the pids array.
a5dfbb9d
MD
2881 *
2882 * Returns 0 on success, else a negative LTTng error code.
2883 */
2884int lttng_list_tracker_pids(struct lttng_handle *handle,
2885 int *_enabled, int32_t **_pids, size_t *_nr_pids)
2886{
ebbf5ab7
JR
2887 int ret;
2888 int enabled = 1;
a5dfbb9d
MD
2889 struct lttcomm_session_msg lsm;
2890 size_t nr_pids;
ff75c11e 2891 int32_t *pids = NULL;
a5dfbb9d
MD
2892
2893 if (handle == NULL) {
2894 return -LTTNG_ERR_INVALID;
2895 }
2896
2897 memset(&lsm, 0, sizeof(lsm));
2898 lsm.cmd_type = LTTNG_LIST_TRACKER_PIDS;
2899 lttng_ctl_copy_string(lsm.session.name, handle->session_name,
2900 sizeof(lsm.session.name));
2901 lttng_ctl_copy_lttng_domain(&lsm.domain, &handle->domain);
2902
2903 ret = lttng_ctl_ask_sessiond(&lsm, (void **) &pids);
2904 if (ret < 0) {
2905 return ret;
2906 }
2907 nr_pids = ret / sizeof(int32_t);
de8218d4
JG
2908 if (nr_pids > 0 && !pids) {
2909 return -LTTNG_ERR_UNK;
2910 }
a5dfbb9d
MD
2911 if (nr_pids == 1 && pids[0] == -1) {
2912 free(pids);
2913 pids = NULL;
2914 enabled = 0;
2915 nr_pids = 0;
2916 }
2917 *_enabled = enabled;
2918 *_pids = pids;
2919 *_nr_pids = nr_pids;
2920 return 0;
2921}
2922
93ec662e
JD
2923/*
2924 * Regenerate the metadata for a session.
2925 * Return 0 on success, a negative error code on error.
2926 */
eded6438 2927int lttng_regenerate_metadata(const char *session_name)
93ec662e
JD
2928{
2929 int ret;
2930 struct lttcomm_session_msg lsm;
2931
2932 if (!session_name) {
2933 ret = -LTTNG_ERR_INVALID;
2934 goto end;
2935 }
2936
2937 memset(&lsm, 0, sizeof(lsm));
eded6438 2938 lsm.cmd_type = LTTNG_REGENERATE_METADATA;
93ec662e
JD
2939
2940 lttng_ctl_copy_string(lsm.session.name, session_name,
2941 sizeof(lsm.session.name));
2942
2943 ret = lttng_ctl_ask_sessiond(&lsm, NULL);
2944 if (ret < 0) {
2945 goto end;
2946 }
2947
2948 ret = 0;
2949end:
2950 return ret;
2951}
2952
eded6438
JD
2953/*
2954 * Deprecated, replaced by lttng_regenerate_metadata.
2955 */
2956int lttng_metadata_regenerate(const char *session_name)
2957{
2958 return lttng_regenerate_metadata(session_name);
2959}
2960
c2561365
JD
2961/*
2962 * Regenerate the statedump of a session.
2963 * Return 0 on success, a negative error code on error.
2964 */
2965int lttng_regenerate_statedump(const char *session_name)
2966{
2967 int ret;
2968 struct lttcomm_session_msg lsm;
2969
2970 if (!session_name) {
2971 ret = -LTTNG_ERR_INVALID;
2972 goto end;
2973 }
2974
2975 memset(&lsm, 0, sizeof(lsm));
2976 lsm.cmd_type = LTTNG_REGENERATE_STATEDUMP;
2977
2978 lttng_ctl_copy_string(lsm.session.name, session_name,
2979 sizeof(lsm.session.name));
2980
2981 ret = lttng_ctl_ask_sessiond(&lsm, NULL);
2982 if (ret < 0) {
2983 goto end;
2984 }
2985
2986 ret = 0;
2987end:
2988 return ret;
2989}
2990
a58c490f
JG
2991int lttng_register_trigger(struct lttng_trigger *trigger)
2992{
2993 int ret;
2994 struct lttcomm_session_msg lsm;
3647288f 2995 struct lttng_dynamic_buffer buffer;
a58c490f 2996
3647288f 2997 lttng_dynamic_buffer_init(&buffer);
a58c490f
JG
2998 if (!trigger) {
2999 ret = -LTTNG_ERR_INVALID;
3000 goto end;
3001 }
3002
3003 if (!lttng_trigger_validate(trigger)) {
eac4828d 3004 ret = -LTTNG_ERR_INVALID_TRIGGER;
a58c490f
JG
3005 goto end;
3006 }
3007
3647288f
JG
3008 ret = lttng_trigger_serialize(trigger, &buffer);
3009 if (ret < 0) {
a58c490f
JG
3010 ret = -LTTNG_ERR_UNK;
3011 goto end;
3012 }
3013
a58c490f
JG
3014 memset(&lsm, 0, sizeof(lsm));
3015 lsm.cmd_type = LTTNG_REGISTER_TRIGGER;
3647288f
JG
3016 lsm.u.trigger.length = (uint32_t) buffer.size;
3017 ret = lttng_ctl_ask_sessiond_varlen_no_cmd_header(&lsm, buffer.data,
3018 buffer.size, NULL);
a58c490f 3019end:
3647288f 3020 lttng_dynamic_buffer_reset(&buffer);
a58c490f
JG
3021 return ret;
3022}
3023
3024int lttng_unregister_trigger(struct lttng_trigger *trigger)
3025{
3026 int ret;
3027 struct lttcomm_session_msg lsm;
3647288f 3028 struct lttng_dynamic_buffer buffer;
a58c490f 3029
3647288f 3030 lttng_dynamic_buffer_init(&buffer);
a58c490f
JG
3031 if (!trigger) {
3032 ret = -LTTNG_ERR_INVALID;
3033 goto end;
3034 }
3035
3036 if (!lttng_trigger_validate(trigger)) {
3647288f 3037 ret = -LTTNG_ERR_INVALID_TRIGGER;
a58c490f
JG
3038 goto end;
3039 }
3040
3647288f
JG
3041 ret = lttng_trigger_serialize(trigger, &buffer);
3042 if (ret < 0) {
a58c490f
JG
3043 ret = -LTTNG_ERR_UNK;
3044 goto end;
3045 }
3046
a58c490f
JG
3047 memset(&lsm, 0, sizeof(lsm));
3048 lsm.cmd_type = LTTNG_UNREGISTER_TRIGGER;
3647288f
JG
3049 lsm.u.trigger.length = (uint32_t) buffer.size;
3050 ret = lttng_ctl_ask_sessiond_varlen_no_cmd_header(&lsm, buffer.data,
3051 buffer.size, NULL);
a58c490f 3052end:
3647288f 3053 lttng_dynamic_buffer_reset(&buffer);
a58c490f
JG
3054 return ret;
3055}
3056
fac6795d 3057/*
9ae110e2 3058 * lib constructor.
fac6795d 3059 */
b2b89e8a 3060static void __attribute__((constructor)) init(void)
fac6795d
DG
3061{
3062 /* Set default session group */
bbccc3d2 3063 lttng_set_tracing_group(DEFAULT_TRACING_GROUP);
fac6795d 3064}
49cca668
DG
3065
3066/*
9ae110e2 3067 * lib destructor.
49cca668 3068 */
b2b89e8a 3069static void __attribute__((destructor)) lttng_ctl_exit(void)
49cca668
DG
3070{
3071 free(tracing_group);
3072}
This page took 0.368602 seconds and 4 git commands to generate.