Tests fix: source utils.sh before using conf_proc_count
[lttng-tools.git] / src / lib / lttng-ctl / lttng-ctl.c
CommitLineData
826d496d 1/*
82a3637f
DG
2 * liblttngctl.c
3 *
4 * Linux Trace Toolkit Control Library
5 *
826d496d 6 * Copyright (C) 2011 David Goulet <david.goulet@polymtl.ca>
fac6795d 7 *
d14d33bf
AM
8 * This library is free software; you can redistribute it and/or modify it
9 * under the terms of the GNU Lesser General Public License, version 2.1 only,
10 * as published by the Free Software Foundation.
82a3637f
DG
11 *
12 * This library is distributed in the hope that it will be useful,
fac6795d 13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
82a3637f
DG
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Lesser General Public License for more details.
16 *
d14d33bf
AM
17 * You should have received a copy of the GNU Lesser General Public License
18 * along with this library; if not, write to the Free Software Foundation,
19 * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
fac6795d
DG
20 */
21
6c1c0768 22#define _LGPL_SOURCE
44a5e5eb 23#include <assert.h>
fac6795d 24#include <grp.h>
1e307fab 25#include <errno.h>
fac6795d
DG
26#include <stdio.h>
27#include <stdlib.h>
28#include <string.h>
29#include <unistd.h>
30
990570ed
DG
31#include <common/common.h>
32#include <common/defaults.h>
db758600 33#include <common/sessiond-comm/sessiond-comm.h>
a4b92340 34#include <common/uri.h>
feb0f3e5 35#include <common/utils.h>
1e307fab 36#include <lttng/lttng.h>
0c89d795 37#include <lttng/health-internal.h>
fac6795d 38
d00c599e
DG
39#include "filter/filter-ast.h"
40#include "filter/filter-parser.h"
41#include "filter/filter-bytecode.h"
42#include "filter/memstream.h"
cac3069d 43#include "lttng-ctl-helper.h"
53a80697
MD
44
45#ifdef DEBUG
d00c599e 46static const int print_xml = 1;
53a80697
MD
47#define dbg_printf(fmt, args...) \
48 printf("[debug liblttng-ctl] " fmt, ## args)
49#else
d00c599e 50static const int print_xml = 0;
53a80697
MD
51#define dbg_printf(fmt, args...) \
52do { \
53 /* do nothing but check printf format */ \
54 if (0) \
55 printf("[debug liblttnctl] " fmt, ## args); \
56} while (0)
57#endif
58
59
fac6795d
DG
60/* Socket to session daemon for communication */
61static int sessiond_socket;
62static char sessiond_sock_path[PATH_MAX];
63
fac6795d
DG
64/* Variables */
65static char *tracing_group;
66static int connected;
67
97e19046
DG
68/* Global */
69
70/*
71 * Those two variables are used by error.h to silent or control the verbosity of
72 * error message. They are global to the library so application linking with it
73 * are able to compile correctly and also control verbosity of the library.
97e19046
DG
74 */
75int lttng_opt_quiet;
76int lttng_opt_verbose;
c7e35b03 77int lttng_opt_mi;
97e19046 78
99497cd0
MD
79/*
80 * Copy string from src to dst and enforce null terminated byte.
81 */
cac3069d
DG
82LTTNG_HIDDEN
83void lttng_ctl_copy_string(char *dst, const char *src, size_t len)
99497cd0 84{
e7d6716d 85 if (src && dst) {
99497cd0
MD
86 strncpy(dst, src, len);
87 /* Enforce the NULL terminated byte */
88 dst[len - 1] = '\0';
cd80958d
DG
89 } else if (dst) {
90 dst[0] = '\0';
99497cd0
MD
91 }
92}
93
fac6795d 94/*
cd80958d 95 * Copy domain to lttcomm_session_msg domain.
fac6795d 96 *
cd80958d
DG
97 * If domain is unknown, default domain will be the kernel.
98 */
cac3069d
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99LTTNG_HIDDEN
100void lttng_ctl_copy_lttng_domain(struct lttng_domain *dst,
101 struct lttng_domain *src)
cd80958d
DG
102{
103 if (src && dst) {
104 switch (src->type) {
00e2e675
DG
105 case LTTNG_DOMAIN_KERNEL:
106 case LTTNG_DOMAIN_UST:
b9dfb167 107 case LTTNG_DOMAIN_JUL:
5cdb6027 108 case LTTNG_DOMAIN_LOG4J:
0e115563 109 case LTTNG_DOMAIN_PYTHON:
00e2e675
DG
110 memcpy(dst, src, sizeof(struct lttng_domain));
111 break;
112 default:
113 memset(dst, 0, sizeof(struct lttng_domain));
00e2e675 114 break;
cd80958d
DG
115 }
116 }
117}
118
119/*
120 * Send lttcomm_session_msg to the session daemon.
fac6795d 121 *
1c8d13c8
TD
122 * On success, returns the number of bytes sent (>=0)
123 * On error, returns -1
fac6795d 124 */
cd80958d 125static int send_session_msg(struct lttcomm_session_msg *lsm)
fac6795d
DG
126{
127 int ret;
128
129 if (!connected) {
2f70b271 130 ret = -LTTNG_ERR_NO_SESSIOND;
e065084a 131 goto end;
fac6795d
DG
132 }
133
a4b92340
DG
134 DBG("LSM cmd type : %d", lsm->cmd_type);
135
be040666 136 ret = lttcomm_send_creds_unix_sock(sessiond_socket, lsm,
cd80958d 137 sizeof(struct lttcomm_session_msg));
2f70b271
DG
138 if (ret < 0) {
139 ret = -LTTNG_ERR_FATAL;
140 }
e065084a
DG
141
142end:
143 return ret;
144}
145
53a80697
MD
146/*
147 * Send var len data to the session daemon.
148 *
149 * On success, returns the number of bytes sent (>=0)
150 * On error, returns -1
151 */
152static int send_session_varlen(void *data, size_t len)
153{
154 int ret;
155
156 if (!connected) {
2f70b271 157 ret = -LTTNG_ERR_NO_SESSIOND;
53a80697
MD
158 goto end;
159 }
a4b92340 160
53a80697
MD
161 if (!data || !len) {
162 ret = 0;
163 goto end;
164 }
165
166 ret = lttcomm_send_unix_sock(sessiond_socket, data, len);
2f70b271
DG
167 if (ret < 0) {
168 ret = -LTTNG_ERR_FATAL;
169 }
53a80697
MD
170
171end:
172 return ret;
173}
174
e065084a 175/*
cd80958d 176 * Receive data from the sessiond socket.
e065084a 177 *
1c8d13c8
TD
178 * On success, returns the number of bytes received (>=0)
179 * On error, returns -1 (recvmsg() error) or -ENOTCONN
e065084a 180 */
ca95a216 181static int recv_data_sessiond(void *buf, size_t len)
e065084a
DG
182{
183 int ret;
184
185 if (!connected) {
2f70b271 186 ret = -LTTNG_ERR_NO_SESSIOND;
e065084a 187 goto end;
fac6795d
DG
188 }
189
ca95a216 190 ret = lttcomm_recv_unix_sock(sessiond_socket, buf, len);
2f70b271
DG
191 if (ret < 0) {
192 ret = -LTTNG_ERR_FATAL;
193 }
fac6795d 194
e065084a 195end:
fac6795d
DG
196 return ret;
197}
198
199/*
1c8d13c8 200 * Check if we are in the specified group.
65beb5ff 201 *
2269e89e 202 * If yes return 1, else return -1.
947308c4 203 */
6c71277b
MD
204LTTNG_HIDDEN
205int lttng_check_tracing_group(void)
947308c4
DG
206{
207 struct group *grp_tracing; /* no free(). See getgrnam(3) */
208 gid_t *grp_list;
209 int grp_list_size, grp_id, i;
210 int ret = -1;
6c71277b 211 const char *grp_name = tracing_group;
947308c4
DG
212
213 /* Get GID of group 'tracing' */
214 grp_tracing = getgrnam(grp_name);
b4d8603b
MD
215 if (!grp_tracing) {
216 /* If grp_tracing is NULL, the group does not exist. */
947308c4
DG
217 goto end;
218 }
219
220 /* Get number of supplementary group IDs */
221 grp_list_size = getgroups(0, NULL);
222 if (grp_list_size < 0) {
6f04ed72 223 PERROR("getgroups");
947308c4
DG
224 goto end;
225 }
226
227 /* Alloc group list of the right size */
3f451dc0 228 grp_list = zmalloc(grp_list_size * sizeof(gid_t));
00795392 229 if (!grp_list) {
6f04ed72 230 PERROR("malloc");
00795392
MD
231 goto end;
232 }
947308c4 233 grp_id = getgroups(grp_list_size, grp_list);
1c8d13c8 234 if (grp_id < 0) {
6f04ed72 235 PERROR("getgroups");
947308c4
DG
236 goto free_list;
237 }
238
239 for (i = 0; i < grp_list_size; i++) {
240 if (grp_list[i] == grp_tracing->gr_gid) {
2269e89e 241 ret = 1;
947308c4
DG
242 break;
243 }
244 }
245
246free_list:
247 free(grp_list);
248
249end:
250 return ret;
251}
252
253/*
2269e89e
DG
254 * Try connect to session daemon with sock_path.
255 *
256 * Return 0 on success, else -1
257 */
258static int try_connect_sessiond(const char *sock_path)
259{
260 int ret;
261
262 /* If socket exist, we check if the daemon listens for connect. */
263 ret = access(sock_path, F_OK);
264 if (ret < 0) {
265 /* Not alive */
2f70b271 266 goto error;
2269e89e
DG
267 }
268
269 ret = lttcomm_connect_unix_sock(sock_path);
270 if (ret < 0) {
271 /* Not alive */
2f70b271 272 goto error;
2269e89e
DG
273 }
274
275 ret = lttcomm_close_unix_sock(ret);
276 if (ret < 0) {
6f04ed72 277 PERROR("lttcomm_close_unix_sock");
2269e89e
DG
278 }
279
280 return 0;
2f70b271
DG
281
282error:
283 return -1;
2269e89e
DG
284}
285
286/*
2f70b271
DG
287 * Set sessiond socket path by putting it in the global sessiond_sock_path
288 * variable.
289 *
290 * Returns 0 on success, negative value on failure (the sessiond socket path
291 * is somehow too long or ENOMEM).
947308c4
DG
292 */
293static int set_session_daemon_path(void)
294{
2269e89e
DG
295 int in_tgroup = 0; /* In tracing group */
296 uid_t uid;
297
298 uid = getuid();
947308c4 299
2269e89e
DG
300 if (uid != 0) {
301 /* Are we in the tracing group ? */
6c71277b 302 in_tgroup = lttng_check_tracing_group();
2269e89e
DG
303 }
304
08a9c49f 305 if ((uid == 0) || in_tgroup) {
cac3069d
DG
306 lttng_ctl_copy_string(sessiond_sock_path,
307 DEFAULT_GLOBAL_CLIENT_UNIX_SOCK, sizeof(sessiond_sock_path));
08a9c49f 308 }
2269e89e 309
08a9c49f 310 if (uid != 0) {
c617c0c6
MD
311 int ret;
312
08a9c49f
TD
313 if (in_tgroup) {
314 /* Tracing group */
315 ret = try_connect_sessiond(sessiond_sock_path);
316 if (ret >= 0) {
317 goto end;
2269e89e 318 }
08a9c49f 319 /* Global session daemon not available... */
2269e89e 320 }
08a9c49f
TD
321 /* ...or not in tracing group (and not root), default */
322
323 /*
324 * With GNU C < 2.1, snprintf returns -1 if the target buffer is too small;
325 * With GNU C >= 2.1, snprintf returns the required size (excluding closing null)
326 */
327 ret = snprintf(sessiond_sock_path, sizeof(sessiond_sock_path),
feb0f3e5 328 DEFAULT_HOME_CLIENT_UNIX_SOCK, utils_get_home_dir());
08a9c49f 329 if ((ret < 0) || (ret >= sizeof(sessiond_sock_path))) {
2f70b271 330 goto error;
947308c4 331 }
947308c4 332 }
08a9c49f 333end:
947308c4 334 return 0;
2f70b271
DG
335
336error:
337 return -1;
947308c4
DG
338}
339
65beb5ff
DG
340/*
341 * Connect to the LTTng session daemon.
342 *
343 * On success, return 0. On error, return -1.
344 */
345static int connect_sessiond(void)
346{
347 int ret;
348
da3c9ec1
DG
349 /* Don't try to connect if already connected. */
350 if (connected) {
351 return 0;
352 }
353
65beb5ff
DG
354 ret = set_session_daemon_path();
355 if (ret < 0) {
2f70b271 356 goto error;
65beb5ff
DG
357 }
358
359 /* Connect to the sesssion daemon */
360 ret = lttcomm_connect_unix_sock(sessiond_sock_path);
361 if (ret < 0) {
2f70b271 362 goto error;
65beb5ff
DG
363 }
364
365 sessiond_socket = ret;
366 connected = 1;
367
368 return 0;
2f70b271
DG
369
370error:
371 return -1;
65beb5ff
DG
372}
373
374/*
1c8d13c8
TD
375 * Clean disconnect from the session daemon.
376 * On success, return 0. On error, return -1.
65beb5ff
DG
377 */
378static int disconnect_sessiond(void)
379{
380 int ret = 0;
381
382 if (connected) {
383 ret = lttcomm_close_unix_sock(sessiond_socket);
384 sessiond_socket = 0;
385 connected = 0;
386 }
387
388 return ret;
389}
390
35a6fdb7 391/*
cd80958d 392 * Ask the session daemon a specific command and put the data into buf.
53a80697 393 * Takes extra var. len. data as input to send to the session daemon.
65beb5ff 394 *
af87c45a 395 * Return size of data (only payload, not header) or a negative error code.
65beb5ff 396 */
cac3069d
DG
397LTTNG_HIDDEN
398int lttng_ctl_ask_sessiond_varlen(struct lttcomm_session_msg *lsm,
a4b92340 399 void *vardata, size_t varlen, void **buf)
65beb5ff
DG
400{
401 int ret;
402 size_t size;
403 void *data = NULL;
cd80958d 404 struct lttcomm_lttng_msg llm;
65beb5ff
DG
405
406 ret = connect_sessiond();
407 if (ret < 0) {
2f70b271 408 ret = -LTTNG_ERR_NO_SESSIOND;
65beb5ff
DG
409 goto end;
410 }
411
65beb5ff 412 /* Send command to session daemon */
cd80958d 413 ret = send_session_msg(lsm);
65beb5ff 414 if (ret < 0) {
2f70b271 415 /* Ret value is a valid lttng error code. */
65beb5ff
DG
416 goto end;
417 }
53a80697
MD
418 /* Send var len data */
419 ret = send_session_varlen(vardata, varlen);
420 if (ret < 0) {
2f70b271 421 /* Ret value is a valid lttng error code. */
53a80697
MD
422 goto end;
423 }
65beb5ff
DG
424
425 /* Get header from data transmission */
426 ret = recv_data_sessiond(&llm, sizeof(llm));
427 if (ret < 0) {
2f70b271 428 /* Ret value is a valid lttng error code. */
65beb5ff
DG
429 goto end;
430 }
431
432 /* Check error code if OK */
f73fabfd 433 if (llm.ret_code != LTTNG_OK) {
65beb5ff
DG
434 ret = -llm.ret_code;
435 goto end;
436 }
437
438 size = llm.data_size;
439 if (size == 0) {
874d3f84 440 /* If client free with size 0 */
a45d5536
DG
441 if (buf != NULL) {
442 *buf = NULL;
443 }
7d29a247 444 ret = 0;
65beb5ff
DG
445 goto end;
446 }
447
3f451dc0
MD
448 data = zmalloc(size);
449 if (!data) {
450 ret = -ENOMEM;
451 goto end;
452 }
65beb5ff
DG
453
454 /* Get payload data */
455 ret = recv_data_sessiond(data, size);
456 if (ret < 0) {
457 free(data);
458 goto end;
459 }
460
83009e5e
DG
461 /*
462 * Extra protection not to dereference a NULL pointer. If buf is NULL at
463 * this point, an error is returned and data is freed.
464 */
465 if (buf == NULL) {
2f70b271 466 ret = -LTTNG_ERR_INVALID;
83009e5e
DG
467 free(data);
468 goto end;
469 }
470
65beb5ff
DG
471 *buf = data;
472 ret = size;
473
474end:
475 disconnect_sessiond();
476 return ret;
477}
478
9f19cc17 479/*
cd80958d 480 * Create lttng handle and return pointer.
1c8d13c8 481 * The returned pointer will be NULL in case of malloc() error.
9f19cc17 482 */
cd80958d
DG
483struct lttng_handle *lttng_create_handle(const char *session_name,
484 struct lttng_domain *domain)
9f19cc17 485{
2f70b271
DG
486 struct lttng_handle *handle = NULL;
487
488 if (domain == NULL) {
489 goto end;
490 }
cd80958d 491
3f451dc0 492 handle = zmalloc(sizeof(struct lttng_handle));
cd80958d 493 if (handle == NULL) {
2f70b271 494 PERROR("malloc handle");
cd80958d
DG
495 goto end;
496 }
497
498 /* Copy session name */
cac3069d 499 lttng_ctl_copy_string(handle->session_name, session_name,
cd80958d
DG
500 sizeof(handle->session_name));
501
502 /* Copy lttng domain */
cac3069d 503 lttng_ctl_copy_lttng_domain(&handle->domain, domain);
cd80958d
DG
504
505end:
506 return handle;
507}
508
509/*
510 * Destroy handle by free(3) the pointer.
511 */
512void lttng_destroy_handle(struct lttng_handle *handle)
513{
0e428499 514 free(handle);
eb354453
DG
515}
516
d9800920
DG
517/*
518 * Register an outside consumer.
1c8d13c8 519 * Returns size of returned session payload data or a negative error code.
d9800920
DG
520 */
521int lttng_register_consumer(struct lttng_handle *handle,
522 const char *socket_path)
523{
524 struct lttcomm_session_msg lsm;
525
2f70b271
DG
526 if (handle == NULL || socket_path == NULL) {
527 return -LTTNG_ERR_INVALID;
528 }
529
53efb85a 530 memset(&lsm, 0, sizeof(lsm));
d9800920 531 lsm.cmd_type = LTTNG_REGISTER_CONSUMER;
cac3069d 532 lttng_ctl_copy_string(lsm.session.name, handle->session_name,
d9800920 533 sizeof(lsm.session.name));
cac3069d 534 lttng_ctl_copy_lttng_domain(&lsm.domain, &handle->domain);
d9800920 535
cac3069d 536 lttng_ctl_copy_string(lsm.u.reg.path, socket_path, sizeof(lsm.u.reg.path));
d9800920 537
cac3069d 538 return lttng_ctl_ask_sessiond(&lsm, NULL);
d9800920
DG
539}
540
1df4dedd 541/*
1c8d13c8
TD
542 * Start tracing for all traces of the session.
543 * Returns size of returned session payload data or a negative error code.
1df4dedd 544 */
6a4f824d 545int lttng_start_tracing(const char *session_name)
f3ed775e 546{
cd80958d
DG
547 struct lttcomm_session_msg lsm;
548
6a4f824d 549 if (session_name == NULL) {
2f70b271 550 return -LTTNG_ERR_INVALID;
cd80958d
DG
551 }
552
53efb85a 553 memset(&lsm, 0, sizeof(lsm));
cd80958d 554 lsm.cmd_type = LTTNG_START_TRACE;
6a4f824d 555
cac3069d
DG
556 lttng_ctl_copy_string(lsm.session.name, session_name,
557 sizeof(lsm.session.name));
cd80958d 558
cac3069d 559 return lttng_ctl_ask_sessiond(&lsm, NULL);
f3ed775e 560}
1df4dedd
DG
561
562/*
38ee087f 563 * Stop tracing for all traces of the session.
f3ed775e 564 */
38ee087f 565static int _lttng_stop_tracing(const char *session_name, int wait)
f3ed775e 566{
38ee087f 567 int ret, data_ret;
cd80958d
DG
568 struct lttcomm_session_msg lsm;
569
6a4f824d 570 if (session_name == NULL) {
2f70b271 571 return -LTTNG_ERR_INVALID;
6a4f824d
DG
572 }
573
53efb85a 574 memset(&lsm, 0, sizeof(lsm));
cd80958d 575 lsm.cmd_type = LTTNG_STOP_TRACE;
6a4f824d 576
cac3069d
DG
577 lttng_ctl_copy_string(lsm.session.name, session_name,
578 sizeof(lsm.session.name));
cd80958d 579
cac3069d 580 ret = lttng_ctl_ask_sessiond(&lsm, NULL);
38ee087f
DG
581 if (ret < 0 && ret != -LTTNG_ERR_TRACE_ALREADY_STOPPED) {
582 goto error;
583 }
584
585 if (!wait) {
586 goto end;
587 }
588
38ee087f
DG
589 /* Check for data availability */
590 do {
6d805429 591 data_ret = lttng_data_pending(session_name);
38ee087f
DG
592 if (data_ret < 0) {
593 /* Return the data available call error. */
594 ret = data_ret;
595 goto error;
596 }
597
598 /*
599 * Data sleep time before retrying (in usec). Don't sleep if the call
600 * returned value indicates availability.
601 */
6d805429 602 if (data_ret) {
38ee087f 603 usleep(DEFAULT_DATA_AVAILABILITY_WAIT_TIME);
38ee087f 604 }
6d805429 605 } while (data_ret != 0);
38ee087f 606
38ee087f
DG
607end:
608error:
609 return ret;
610}
611
612/*
613 * Stop tracing and wait for data availability.
614 */
615int lttng_stop_tracing(const char *session_name)
616{
617 return _lttng_stop_tracing(session_name, 1);
618}
619
620/*
621 * Stop tracing but _don't_ wait for data availability.
622 */
623int lttng_stop_tracing_no_wait(const char *session_name)
624{
625 return _lttng_stop_tracing(session_name, 0);
f3ed775e
DG
626}
627
628/*
601d5acf
DG
629 * Add context to a channel.
630 *
631 * If the given channel is NULL, add the contexts to all channels.
632 * The event_name param is ignored.
af87c45a
DG
633 *
634 * Returns the size of the returned payload data or a negative error code.
1df4dedd 635 */
cd80958d 636int lttng_add_context(struct lttng_handle *handle,
38057ed1
DG
637 struct lttng_event_context *ctx, const char *event_name,
638 const char *channel_name)
d65106b1 639{
cd80958d
DG
640 struct lttcomm_session_msg lsm;
641
9d697d3d
DG
642 /* Safety check. Both are mandatory */
643 if (handle == NULL || ctx == NULL) {
2f70b271 644 return -LTTNG_ERR_INVALID;
cd80958d
DG
645 }
646
441c16a7
MD
647 memset(&lsm, 0, sizeof(lsm));
648
cd80958d
DG
649 lsm.cmd_type = LTTNG_ADD_CONTEXT;
650
85076754
MD
651 /* If no channel name, send empty string. */
652 if (channel_name == NULL) {
653 lttng_ctl_copy_string(lsm.u.context.channel_name, "",
654 sizeof(lsm.u.context.channel_name));
655 } else {
656 lttng_ctl_copy_string(lsm.u.context.channel_name, channel_name,
657 sizeof(lsm.u.context.channel_name));
658 }
cd80958d 659
cac3069d 660 lttng_ctl_copy_lttng_domain(&lsm.domain, &handle->domain);
d65106b1 661
9d697d3d 662 memcpy(&lsm.u.context.ctx, ctx, sizeof(struct lttng_event_context));
d65106b1 663
cac3069d 664 lttng_ctl_copy_string(lsm.session.name, handle->session_name,
cd80958d
DG
665 sizeof(lsm.session.name));
666
cac3069d 667 return lttng_ctl_ask_sessiond(&lsm, NULL);
d65106b1
DG
668}
669
f3ed775e 670/*
1c8d13c8
TD
671 * Enable event(s) for a channel.
672 * If no event name is specified, all events are enabled.
673 * If no channel name is specified, the default 'channel0' is used.
674 * Returns size of returned session payload data or a negative error code.
f3ed775e 675 */
cd80958d 676int lttng_enable_event(struct lttng_handle *handle,
38057ed1 677 struct lttng_event *ev, const char *channel_name)
1df4dedd 678{
f8a96544
JI
679 return lttng_enable_event_with_exclusions(handle, ev, channel_name,
680 NULL, 0, NULL);
1df4dedd
DG
681}
682
53a80697 683/*
025faf73 684 * Create or enable an event with a filter expression.
178191b3 685 *
53a80697
MD
686 * Return negative error value on error.
687 * Return size of returned session payload data if OK.
688 */
025faf73 689int lttng_enable_event_with_filter(struct lttng_handle *handle,
178191b3 690 struct lttng_event *event, const char *channel_name,
53a80697
MD
691 const char *filter_expression)
692{
f8a96544
JI
693 return lttng_enable_event_with_exclusions(handle, event, channel_name,
694 filter_expression, 0, NULL);
53a80697
MD
695}
696
347c5ab5 697/*
0e115563 698 * Depending on the event, return a newly allocated agent filter expression or
347c5ab5
DG
699 * NULL if not applicable.
700 *
701 * An event with NO loglevel and the name is * will return NULL.
702 */
0e115563 703static char *set_agent_filter(const char *filter, struct lttng_event *ev)
347c5ab5
DG
704{
705 int err;
0e115563 706 char *agent_filter = NULL;
347c5ab5
DG
707
708 assert(ev);
709
710 /* Don't add filter for the '*' event. */
711 if (ev->name[0] != '*') {
712 if (filter) {
0e115563 713 err = asprintf(&agent_filter, "(%s) && (logger_name == \"%s\")", filter,
347c5ab5
DG
714 ev->name);
715 } else {
0e115563 716 err = asprintf(&agent_filter, "logger_name == \"%s\"", ev->name);
347c5ab5
DG
717 }
718 if (err < 0) {
719 PERROR("asprintf");
6a556f7b 720 goto error;
347c5ab5
DG
721 }
722 }
723
724 /* Add loglevel filtering if any for the JUL domain. */
725 if (ev->loglevel_type != LTTNG_EVENT_LOGLEVEL_ALL) {
726 char *op;
727
728 if (ev->loglevel_type == LTTNG_EVENT_LOGLEVEL_RANGE) {
729 op = ">=";
730 } else {
731 op = "==";
732 }
733
0e115563 734 if (filter || agent_filter) {
6a556f7b
JG
735 char *new_filter;
736
fb0edb23 737 err = asprintf(&new_filter, "(%s) && (int_loglevel %s %d)",
0e115563 738 agent_filter ? agent_filter : filter, op,
347c5ab5 739 ev->loglevel);
0e115563
DG
740 if (agent_filter) {
741 free(agent_filter);
6a556f7b 742 }
0e115563 743 agent_filter = new_filter;
347c5ab5 744 } else {
0e115563 745 err = asprintf(&agent_filter, "int_loglevel %s %d", op,
347c5ab5
DG
746 ev->loglevel);
747 }
748 if (err < 0) {
749 PERROR("asprintf");
6a556f7b 750 goto error;
347c5ab5
DG
751 }
752 }
753
0e115563 754 return agent_filter;
6a556f7b 755error:
0e115563 756 free(agent_filter);
6a556f7b 757 return NULL;
347c5ab5
DG
758}
759
137b9942 760/*
ec166985 761 * Generate the filter bytecode from a given filter expression string. Put the
137b9942
DG
762 * newly allocated parser context in ctxp and populate the lsm object with the
763 * expression len.
764 *
765 * Return 0 on success else a LTTNG_ERR_* code and ctxp is untouched.
766 */
767static int generate_filter(char *filter_expression,
768 struct lttcomm_session_msg *lsm, struct filter_parser_ctx **ctxp)
769{
770 int ret;
771 struct filter_parser_ctx *ctx = NULL;
772 FILE *fmem = NULL;
773
774 assert(filter_expression);
775 assert(lsm);
776 assert(ctxp);
777
778 /*
779 * Casting const to non-const, as the underlying function will use it in
780 * read-only mode.
781 */
782 fmem = lttng_fmemopen((void *) filter_expression,
783 strlen(filter_expression), "r");
784 if (!fmem) {
785 fprintf(stderr, "Error opening memory as stream\n");
786 ret = -LTTNG_ERR_FILTER_NOMEM;
787 goto error;
788 }
789 ctx = filter_parser_ctx_alloc(fmem);
790 if (!ctx) {
791 fprintf(stderr, "Error allocating parser\n");
792 ret = -LTTNG_ERR_FILTER_NOMEM;
793 goto filter_alloc_error;
794 }
795 ret = filter_parser_ctx_append_ast(ctx);
796 if (ret) {
797 fprintf(stderr, "Parse error\n");
798 ret = -LTTNG_ERR_FILTER_INVAL;
799 goto parse_error;
800 }
801 ret = filter_visitor_set_parent(ctx);
802 if (ret) {
803 fprintf(stderr, "Set parent error\n");
804 ret = -LTTNG_ERR_FILTER_INVAL;
805 goto parse_error;
806 }
807 if (print_xml) {
808 ret = filter_visitor_print_xml(ctx, stdout, 0);
809 if (ret) {
810 fflush(stdout);
811 fprintf(stderr, "XML print error\n");
812 ret = -LTTNG_ERR_FILTER_INVAL;
813 goto parse_error;
814 }
815 }
816
817 dbg_printf("Generating IR... ");
818 fflush(stdout);
819 ret = filter_visitor_ir_generate(ctx);
820 if (ret) {
821 fprintf(stderr, "Generate IR error\n");
822 ret = -LTTNG_ERR_FILTER_INVAL;
823 goto parse_error;
824 }
825 dbg_printf("done\n");
826
827 dbg_printf("Validating IR... ");
828 fflush(stdout);
829 ret = filter_visitor_ir_check_binary_op_nesting(ctx);
830 if (ret) {
831 ret = -LTTNG_ERR_FILTER_INVAL;
832 goto parse_error;
833 }
dcd5daf2
JG
834 /* Validate strings used as literals in the expression */
835 ret = filter_visitor_ir_validate_string(ctx);
836 if (ret) {
837 ret = -LTTNG_ERR_FILTER_INVAL;
838 goto parse_error;
839 }
137b9942
DG
840 dbg_printf("done\n");
841
842 dbg_printf("Generating bytecode... ");
843 fflush(stdout);
844 ret = filter_visitor_bytecode_generate(ctx);
845 if (ret) {
846 fprintf(stderr, "Generate bytecode error\n");
847 ret = -LTTNG_ERR_FILTER_INVAL;
848 goto parse_error;
849 }
850 dbg_printf("done\n");
851 dbg_printf("Size of bytecode generated: %u bytes.\n",
852 bytecode_get_len(&ctx->bytecode->b));
853
854 lsm->u.enable.bytecode_len = sizeof(ctx->bytecode->b)
855 + bytecode_get_len(&ctx->bytecode->b);
856 lsm->u.enable.expression_len = strlen(filter_expression) + 1;
857
858 /* No need to keep the memory stream. */
859 if (fclose(fmem) != 0) {
6f04ed72 860 PERROR("fclose");
137b9942
DG
861 }
862
863 *ctxp = ctx;
864 return 0;
865
866parse_error:
137b9942
DG
867 filter_ir_free(ctx);
868 filter_parser_ctx_free(ctx);
869filter_alloc_error:
870 if (fclose(fmem) != 0) {
6f04ed72 871 PERROR("fclose");
137b9942
DG
872 }
873error:
874 return ret;
875}
876
93deb080
JI
877/*
878 * Enable event(s) for a channel, possibly with exclusions and a filter.
879 * If no event name is specified, all events are enabled.
880 * If no channel name is specified, the default name is used.
881 * If filter expression is not NULL, the filter is set for the event.
882 * If exclusion count is not zero, the exclusions are set for the event.
883 * Returns size of returned session payload data or a negative error code.
884 */
885int lttng_enable_event_with_exclusions(struct lttng_handle *handle,
886 struct lttng_event *ev, const char *channel_name,
e9efbcd3 887 const char *original_filter_expression,
93deb080
JI
888 int exclusion_count, char **exclusion_list)
889{
890 struct lttcomm_session_msg lsm;
64226865 891 char *varlen_data;
93deb080 892 int ret = 0;
137b9942 893 unsigned int free_filter_expression = 0;
93deb080 894 struct filter_parser_ctx *ctx = NULL;
e9efbcd3
JG
895 /*
896 * Cast as non-const since we may replace the filter expression
897 * by a dynamically allocated string. Otherwise, the original
898 * string is not modified.
899 */
900 char *filter_expression = (char *) original_filter_expression;
93deb080
JI
901
902 if (handle == NULL || ev == NULL) {
137b9942
DG
903 ret = -LTTNG_ERR_INVALID;
904 goto error;
93deb080
JI
905 }
906
907 /* Empty filter string will always be rejected by the parser
908 * anyway, so treat this corner-case early to eliminate
909 * lttng_fmemopen error for 0-byte allocation.
910 */
911 if (filter_expression && filter_expression[0] == '\0') {
137b9942
DG
912 ret = -LTTNG_ERR_INVALID;
913 goto error;
93deb080
JI
914 }
915
916 memset(&lsm, 0, sizeof(lsm));
917
918 /* If no channel name, send empty string. */
919 if (channel_name == NULL) {
920 lttng_ctl_copy_string(lsm.u.enable.channel_name, "",
921 sizeof(lsm.u.enable.channel_name));
922 } else {
923 lttng_ctl_copy_string(lsm.u.enable.channel_name, channel_name,
924 sizeof(lsm.u.enable.channel_name));
925 }
926
18a720cd
MD
927 lsm.cmd_type = LTTNG_ENABLE_EVENT;
928 if (ev->name[0] == '\0') {
929 /* Enable all events */
930 lttng_ctl_copy_string(ev->name, "*", sizeof(ev->name));
6565421f 931 }
93deb080 932
6565421f 933 lttng_ctl_copy_lttng_domain(&lsm.domain, &handle->domain);
6e911cad 934 /* FIXME: copying non-packed struct to packed struct. */
93deb080
JI
935 memcpy(&lsm.u.enable.event, ev, sizeof(lsm.u.enable.event));
936
937 lttng_ctl_copy_string(lsm.session.name, handle->session_name,
938 sizeof(lsm.session.name));
939 lsm.u.enable.exclusion_count = exclusion_count;
940 lsm.u.enable.bytecode_len = 0;
941
9b21e6d5
DG
942 /*
943 * For the JUL domain, a filter is enforced except for the enable all
944 * event. This is done to avoid having the event in all sessions thus
945 * filtering by logger name.
946 */
947 if (exclusion_count == 0 && filter_expression == NULL &&
5cdb6027 948 (handle->domain.type != LTTNG_DOMAIN_JUL &&
0e115563
DG
949 handle->domain.type != LTTNG_DOMAIN_LOG4J &&
950 handle->domain.type != LTTNG_DOMAIN_PYTHON)) {
3e1c9ff7 951 goto ask_sessiond;
93deb080
JI
952 }
953
954 /*
955 * We have either a filter or some exclusions, so we need to set up
956 * a variable-length memory block from where to send the data
957 */
958
959 /* Parse filter expression */
5cdb6027 960 if (filter_expression != NULL || handle->domain.type == LTTNG_DOMAIN_JUL
0e115563
DG
961 || handle->domain.type == LTTNG_DOMAIN_LOG4J
962 || handle->domain.type == LTTNG_DOMAIN_PYTHON) {
5cdb6027 963 if (handle->domain.type == LTTNG_DOMAIN_JUL ||
0e115563
DG
964 handle->domain.type == LTTNG_DOMAIN_LOG4J ||
965 handle->domain.type == LTTNG_DOMAIN_PYTHON) {
966 char *agent_filter;
64226865 967
347c5ab5 968 /* Setup JUL filter if needed. */
0e115563
DG
969 agent_filter = set_agent_filter(filter_expression, ev);
970 if (!agent_filter) {
137b9942
DG
971 if (!filter_expression) {
972 /* No JUL and no filter, just skip everything below. */
973 goto ask_sessiond;
974 }
64226865
DG
975 } else {
976 /*
0e115563
DG
977 * With an agent filter, the original filter has been added to
978 * it thus replace the filter expression.
64226865 979 */
0e115563 980 filter_expression = agent_filter;
e9efbcd3 981 free_filter_expression = 1;
9b21e6d5 982 }
9b21e6d5 983 }
93deb080 984
137b9942 985 ret = generate_filter(filter_expression, &lsm, &ctx);
93deb080 986 if (ret) {
137b9942 987 goto filter_error;
93deb080 988 }
6b453b5e
JG
989 }
990
991 varlen_data = zmalloc(lsm.u.enable.bytecode_len
137b9942
DG
992 + lsm.u.enable.expression_len
993 + LTTNG_SYMBOL_NAME_LEN * exclusion_count);
6b453b5e
JG
994 if (!varlen_data) {
995 ret = -LTTNG_ERR_EXCLUSION_NOMEM;
7ca1dc6f 996 goto mem_error;
6b453b5e 997 }
137b9942 998
6b453b5e
JG
999 /* Put exclusion names first in the data */
1000 while (exclusion_count--) {
1001 strncpy(varlen_data + LTTNG_SYMBOL_NAME_LEN * exclusion_count,
0c82ac62
PP
1002 *(exclusion_list + exclusion_count),
1003 LTTNG_SYMBOL_NAME_LEN - 1);
6b453b5e
JG
1004 }
1005 /* Add filter expression next */
1006 if (lsm.u.enable.expression_len != 0) {
1007 memcpy(varlen_data
1008 + LTTNG_SYMBOL_NAME_LEN * lsm.u.enable.exclusion_count,
1009 filter_expression,
1010 lsm.u.enable.expression_len);
1011 }
1012 /* Add filter bytecode next */
137b9942 1013 if (ctx && lsm.u.enable.bytecode_len != 0) {
6b453b5e
JG
1014 memcpy(varlen_data
1015 + LTTNG_SYMBOL_NAME_LEN * lsm.u.enable.exclusion_count
1016 + lsm.u.enable.expression_len,
1017 &ctx->bytecode->b,
1018 lsm.u.enable.bytecode_len);
93deb080
JI
1019 }
1020
1021 ret = lttng_ctl_ask_sessiond_varlen(&lsm, varlen_data,
67676bd8 1022 (LTTNG_SYMBOL_NAME_LEN * lsm.u.enable.exclusion_count) +
137b9942 1023 lsm.u.enable.bytecode_len + lsm.u.enable.expression_len, NULL);
6b453b5e 1024 free(varlen_data);
93deb080 1025
7ca1dc6f
DG
1026mem_error:
1027 if (filter_expression && ctx) {
93deb080
JI
1028 filter_bytecode_free(ctx);
1029 filter_ir_free(ctx);
1030 filter_parser_ctx_free(ctx);
7ca1dc6f
DG
1031 }
1032filter_error:
1033 if (free_filter_expression) {
1034 /*
1035 * The filter expression has been replaced and must be freed as it is
1036 * not the original filter expression received as a parameter.
1037 */
1038 free(filter_expression);
93deb080 1039 }
137b9942
DG
1040error:
1041 /*
1042 * Return directly to the caller and don't ask the sessiond since something
1043 * went wrong in the parsing of data above.
1044 */
93deb080 1045 return ret;
3e1c9ff7
DG
1046
1047ask_sessiond:
1048 ret = lttng_ctl_ask_sessiond(&lsm, NULL);
1049 return ret;
93deb080
JI
1050}
1051
6e911cad
MD
1052int lttng_disable_event_ext(struct lttng_handle *handle,
1053 struct lttng_event *ev, const char *channel_name,
1054 const char *original_filter_expression)
1df4dedd 1055{
cd80958d 1056 struct lttcomm_session_msg lsm;
6e911cad
MD
1057 char *varlen_data;
1058 int ret = 0;
1059 unsigned int free_filter_expression = 0;
1060 struct filter_parser_ctx *ctx = NULL;
1061 /*
1062 * Cast as non-const since we may replace the filter expression
1063 * by a dynamically allocated string. Otherwise, the original
1064 * string is not modified.
1065 */
1066 char *filter_expression = (char *) original_filter_expression;
1df4dedd 1067
6e911cad
MD
1068 if (handle == NULL || ev == NULL) {
1069 ret = -LTTNG_ERR_INVALID;
1070 goto error;
1071 }
1072
1073 /* Empty filter string will always be rejected by the parser
1074 * anyway, so treat this corner-case early to eliminate
1075 * lttng_fmemopen error for 0-byte allocation.
1076 */
1077 if (filter_expression && filter_expression[0] == '\0') {
1078 ret = -LTTNG_ERR_INVALID;
1079 goto error;
cd80958d
DG
1080 }
1081
441c16a7
MD
1082 memset(&lsm, 0, sizeof(lsm));
1083
85076754
MD
1084 /* If no channel name, send empty string. */
1085 if (channel_name == NULL) {
1086 lttng_ctl_copy_string(lsm.u.disable.channel_name, "",
cd80958d 1087 sizeof(lsm.u.disable.channel_name));
f3ed775e 1088 } else {
85076754 1089 lttng_ctl_copy_string(lsm.u.disable.channel_name, channel_name,
cd80958d 1090 sizeof(lsm.u.disable.channel_name));
eb354453
DG
1091 }
1092
18a720cd 1093 lsm.cmd_type = LTTNG_DISABLE_EVENT;
f3ed775e 1094
6e911cad
MD
1095 lttng_ctl_copy_lttng_domain(&lsm.domain, &handle->domain);
1096 /* FIXME: copying non-packed struct to packed struct. */
1097 memcpy(&lsm.u.disable.event, ev, sizeof(lsm.u.disable.event));
1098
cac3069d 1099 lttng_ctl_copy_string(lsm.session.name, handle->session_name,
cd80958d 1100 sizeof(lsm.session.name));
6e911cad 1101 lsm.u.disable.bytecode_len = 0;
cd80958d 1102
6e911cad
MD
1103 /*
1104 * For the JUL domain, a filter is enforced except for the
1105 * disable all event. This is done to avoid having the event in
1106 * all sessions thus filtering by logger name.
1107 */
1108 if (filter_expression == NULL &&
1109 (handle->domain.type != LTTNG_DOMAIN_JUL &&
0e115563
DG
1110 handle->domain.type != LTTNG_DOMAIN_LOG4J &&
1111 handle->domain.type != LTTNG_DOMAIN_PYTHON)) {
6e911cad
MD
1112 goto ask_sessiond;
1113 }
1114
1115 /*
1116 * We have a filter, so we need to set up a variable-length
1117 * memory block from where to send the data.
1118 */
1119
1120 /* Parse filter expression */
1121 if (filter_expression != NULL || handle->domain.type == LTTNG_DOMAIN_JUL
0e115563
DG
1122 || handle->domain.type == LTTNG_DOMAIN_LOG4J
1123 || handle->domain.type == LTTNG_DOMAIN_PYTHON) {
6e911cad 1124 if (handle->domain.type == LTTNG_DOMAIN_JUL ||
0e115563
DG
1125 handle->domain.type == LTTNG_DOMAIN_LOG4J ||
1126 handle->domain.type == LTTNG_DOMAIN_PYTHON) {
1127 char *agent_filter;
6e911cad
MD
1128
1129 /* Setup JUL filter if needed. */
0e115563
DG
1130 agent_filter = set_agent_filter(filter_expression, ev);
1131 if (!agent_filter) {
6e911cad
MD
1132 if (!filter_expression) {
1133 /* No JUL and no filter, just skip everything below. */
1134 goto ask_sessiond;
1135 }
1136 } else {
1137 /*
1138 * With a JUL filter, the original filter has been added to it
1139 * thus replace the filter expression.
1140 */
0e115563 1141 filter_expression = agent_filter;
6e911cad
MD
1142 free_filter_expression = 1;
1143 }
1144 }
1145
1146 ret = generate_filter(filter_expression, &lsm, &ctx);
1147 if (ret) {
1148 goto filter_error;
1149 }
1150 }
1151
1152 varlen_data = zmalloc(lsm.u.disable.bytecode_len
1153 + lsm.u.disable.expression_len);
1154 if (!varlen_data) {
1155 ret = -LTTNG_ERR_EXCLUSION_NOMEM;
1156 goto mem_error;
1157 }
1158
1159 /* Add filter expression */
1160 if (lsm.u.disable.expression_len != 0) {
1161 memcpy(varlen_data,
1162 filter_expression,
1163 lsm.u.disable.expression_len);
1164 }
1165 /* Add filter bytecode next */
1166 if (ctx && lsm.u.disable.bytecode_len != 0) {
1167 memcpy(varlen_data
1168 + lsm.u.disable.expression_len,
1169 &ctx->bytecode->b,
1170 lsm.u.disable.bytecode_len);
1171 }
1172
1173 ret = lttng_ctl_ask_sessiond_varlen(&lsm, varlen_data,
1174 lsm.u.disable.bytecode_len + lsm.u.disable.expression_len, NULL);
1175 free(varlen_data);
1176
1177mem_error:
1178 if (filter_expression && ctx) {
1179 filter_bytecode_free(ctx);
1180 filter_ir_free(ctx);
1181 filter_parser_ctx_free(ctx);
1182 }
1183filter_error:
1184 if (free_filter_expression) {
1185 /*
1186 * The filter expression has been replaced and must be freed as it is
1187 * not the original filter expression received as a parameter.
1188 */
1189 free(filter_expression);
1190 }
1191error:
1192 /*
1193 * Return directly to the caller and don't ask the sessiond since something
1194 * went wrong in the parsing of data above.
1195 */
1196 return ret;
1197
1198ask_sessiond:
1199 ret = lttng_ctl_ask_sessiond(&lsm, NULL);
1200 return ret;
1201}
1202
1203/*
1204 * Disable event(s) of a channel and domain.
1205 * If no event name is specified, all events are disabled.
1206 * If no channel name is specified, the default 'channel0' is used.
1207 * Returns size of returned session payload data or a negative error code.
1208 */
1209int lttng_disable_event(struct lttng_handle *handle, const char *name,
1210 const char *channel_name)
1211{
1212 struct lttng_event ev;
1213
1214 memset(&ev, 0, sizeof(ev));
9b7431cf 1215 ev.loglevel = -1;
6e911cad
MD
1216 ev.type = LTTNG_EVENT_ALL;
1217 lttng_ctl_copy_string(ev.name, name, sizeof(ev.name));
1218 return lttng_disable_event_ext(handle, &ev, channel_name, NULL);
1df4dedd
DG
1219}
1220
1221/*
1c8d13c8
TD
1222 * Enable channel per domain
1223 * Returns size of returned session payload data or a negative error code.
a5c5a2bd 1224 */
cd80958d 1225int lttng_enable_channel(struct lttng_handle *handle,
38057ed1 1226 struct lttng_channel *chan)
a5c5a2bd 1227{
cd80958d
DG
1228 struct lttcomm_session_msg lsm;
1229
5117eeec
DG
1230 /*
1231 * NULL arguments are forbidden. No default values.
1232 */
1233 if (handle == NULL || chan == NULL) {
2f70b271 1234 return -LTTNG_ERR_INVALID;
cd80958d
DG
1235 }
1236
441c16a7
MD
1237 memset(&lsm, 0, sizeof(lsm));
1238
5117eeec 1239 memcpy(&lsm.u.channel.chan, chan, sizeof(lsm.u.channel.chan));
7d29a247 1240
cd80958d
DG
1241 lsm.cmd_type = LTTNG_ENABLE_CHANNEL;
1242
cac3069d 1243 lttng_ctl_copy_lttng_domain(&lsm.domain, &handle->domain);
7d29a247 1244
cac3069d 1245 lttng_ctl_copy_string(lsm.session.name, handle->session_name,
cd80958d
DG
1246 sizeof(lsm.session.name));
1247
cac3069d 1248 return lttng_ctl_ask_sessiond(&lsm, NULL);
8c0faa1d 1249}
1df4dedd 1250
2ef84c95 1251/*
1c8d13c8
TD
1252 * All tracing will be stopped for registered events of the channel.
1253 * Returns size of returned session payload data or a negative error code.
2ef84c95 1254 */
cd80958d 1255int lttng_disable_channel(struct lttng_handle *handle, const char *name)
2ef84c95 1256{
cd80958d
DG
1257 struct lttcomm_session_msg lsm;
1258
9d697d3d
DG
1259 /* Safety check. Both are mandatory */
1260 if (handle == NULL || name == NULL) {
2f70b271 1261 return -LTTNG_ERR_INVALID;
cd80958d
DG
1262 }
1263
441c16a7
MD
1264 memset(&lsm, 0, sizeof(lsm));
1265
cd80958d 1266 lsm.cmd_type = LTTNG_DISABLE_CHANNEL;
1df4dedd 1267
cac3069d 1268 lttng_ctl_copy_string(lsm.u.disable.channel_name, name,
9d697d3d
DG
1269 sizeof(lsm.u.disable.channel_name));
1270
cac3069d 1271 lttng_ctl_copy_lttng_domain(&lsm.domain, &handle->domain);
cd80958d 1272
cac3069d 1273 lttng_ctl_copy_string(lsm.session.name, handle->session_name,
cd80958d
DG
1274 sizeof(lsm.session.name));
1275
cac3069d 1276 return lttng_ctl_ask_sessiond(&lsm, NULL);
ca95a216
DG
1277}
1278
ccf10263
MD
1279/*
1280 * Add PID to session tracker.
1281 * Return 0 on success else a negative LTTng error code.
1282 */
1283int lttng_track_pid(struct lttng_handle *handle, int pid)
1284{
1285 struct lttcomm_session_msg lsm;
1286
1287 /*
1288 * NULL arguments are forbidden. No default values.
1289 */
1290 if (handle == NULL) {
1291 return -LTTNG_ERR_INVALID;
1292 }
1293
1294 memset(&lsm, 0, sizeof(lsm));
1295
1296 lsm.cmd_type = LTTNG_TRACK_PID;
1297 lsm.u.pid_tracker.pid = pid;
1298
1299 lttng_ctl_copy_lttng_domain(&lsm.domain, &handle->domain);
1300
1301 lttng_ctl_copy_string(lsm.session.name, handle->session_name,
1302 sizeof(lsm.session.name));
1303
1304 return lttng_ctl_ask_sessiond(&lsm, NULL);
1305}
1306
1307/*
1308 * Remove PID from session tracker.
1309 * Return 0 on success else a negative LTTng error code.
1310 */
1311int lttng_untrack_pid(struct lttng_handle *handle, int pid)
1312{
1313 struct lttcomm_session_msg lsm;
1314
1315 /*
1316 * NULL arguments are forbidden. No default values.
1317 */
1318 if (handle == NULL) {
1319 return -LTTNG_ERR_INVALID;
1320 }
1321
1322 memset(&lsm, 0, sizeof(lsm));
1323
1324 lsm.cmd_type = LTTNG_UNTRACK_PID;
1325 lsm.u.pid_tracker.pid = pid;
1326
1327 lttng_ctl_copy_lttng_domain(&lsm.domain, &handle->domain);
1328
1329 lttng_ctl_copy_string(lsm.session.name, handle->session_name,
1330 sizeof(lsm.session.name));
1331
1332 return lttng_ctl_ask_sessiond(&lsm, NULL);
1333}
1334
fac6795d 1335/*
1c8d13c8
TD
1336 * Lists all available tracepoints of domain.
1337 * Sets the contents of the events array.
1338 * Returns the number of lttng_event entries in events;
1339 * on error, returns a negative value.
fac6795d 1340 */
cd80958d 1341int lttng_list_tracepoints(struct lttng_handle *handle,
2a71efd5 1342 struct lttng_event **events)
fac6795d 1343{
052da939 1344 int ret;
cd80958d
DG
1345 struct lttcomm_session_msg lsm;
1346
9d697d3d 1347 if (handle == NULL) {
2f70b271 1348 return -LTTNG_ERR_INVALID;
cd80958d 1349 }
fac6795d 1350
53efb85a 1351 memset(&lsm, 0, sizeof(lsm));
cd80958d 1352 lsm.cmd_type = LTTNG_LIST_TRACEPOINTS;
cac3069d 1353 lttng_ctl_copy_lttng_domain(&lsm.domain, &handle->domain);
2a71efd5 1354
cac3069d 1355 ret = lttng_ctl_ask_sessiond(&lsm, (void **) events);
052da939
DG
1356 if (ret < 0) {
1357 return ret;
eb354453 1358 }
fac6795d 1359
9f19cc17 1360 return ret / sizeof(struct lttng_event);
fac6795d
DG
1361}
1362
f37d259d
MD
1363/*
1364 * Lists all available tracepoint fields of domain.
1365 * Sets the contents of the event field array.
1366 * Returns the number of lttng_event_field entries in events;
1367 * on error, returns a negative value.
1368 */
1369int lttng_list_tracepoint_fields(struct lttng_handle *handle,
1370 struct lttng_event_field **fields)
1371{
1372 int ret;
1373 struct lttcomm_session_msg lsm;
1374
1375 if (handle == NULL) {
2f70b271 1376 return -LTTNG_ERR_INVALID;
f37d259d
MD
1377 }
1378
53efb85a 1379 memset(&lsm, 0, sizeof(lsm));
f37d259d 1380 lsm.cmd_type = LTTNG_LIST_TRACEPOINT_FIELDS;
cac3069d 1381 lttng_ctl_copy_lttng_domain(&lsm.domain, &handle->domain);
f37d259d 1382
cac3069d 1383 ret = lttng_ctl_ask_sessiond(&lsm, (void **) fields);
f37d259d
MD
1384 if (ret < 0) {
1385 return ret;
1386 }
1387
1388 return ret / sizeof(struct lttng_event_field);
1389}
1390
834978fd
DG
1391/*
1392 * Lists all available kernel system calls. Allocates and sets the contents of
1393 * the events array.
1394 *
1395 * Returns the number of lttng_event entries in events; on error, returns a
1396 * negative value.
1397 */
1398int lttng_list_syscalls(struct lttng_event **events)
1399{
1400 int ret;
1401 struct lttcomm_session_msg lsm;
1402
1403 if (!events) {
1404 return -LTTNG_ERR_INVALID;
1405 }
1406
1407 memset(&lsm, 0, sizeof(lsm));
1408 lsm.cmd_type = LTTNG_LIST_SYSCALLS;
1409 /* Force kernel domain for system calls. */
1410 lsm.domain.type = LTTNG_DOMAIN_KERNEL;
1411
1412 ret = lttng_ctl_ask_sessiond(&lsm, (void **) events);
1413 if (ret < 0) {
1414 return ret;
1415 }
1416
1417 return ret / sizeof(struct lttng_event);
1418}
1419
1657e9bb 1420/*
1c8d13c8
TD
1421 * Returns a human readable string describing
1422 * the error code (a negative value).
1657e9bb 1423 */
9a745bc7 1424const char *lttng_strerror(int code)
1657e9bb 1425{
f73fabfd 1426 return error_get_str(code);
1657e9bb
DG
1427}
1428
aaf97519 1429/*
a4b92340
DG
1430 * Create a brand new session using name and url for destination.
1431 *
f73fabfd 1432 * Returns LTTNG_OK on success or a negative error code.
00e2e675 1433 */
a4b92340 1434int lttng_create_session(const char *name, const char *url)
00e2e675 1435{
3dd05a85 1436 int ret;
a4b92340 1437 ssize_t size;
00e2e675 1438 struct lttcomm_session_msg lsm;
a4b92340 1439 struct lttng_uri *uris = NULL;
00e2e675 1440
a4b92340 1441 if (name == NULL) {
2f70b271 1442 return -LTTNG_ERR_INVALID;
00e2e675
DG
1443 }
1444
a4b92340 1445 memset(&lsm, 0, sizeof(lsm));
00e2e675 1446
a4b92340 1447 lsm.cmd_type = LTTNG_CREATE_SESSION;
cac3069d 1448 lttng_ctl_copy_string(lsm.session.name, name, sizeof(lsm.session.name));
a4b92340
DG
1449
1450 /* There should never be a data URL */
bc894455 1451 size = uri_parse_str_urls(url, NULL, &uris);
a4b92340 1452 if (size < 0) {
2f70b271 1453 return -LTTNG_ERR_INVALID;
00e2e675
DG
1454 }
1455
a4b92340
DG
1456 lsm.u.uri.size = size;
1457
cac3069d
DG
1458 ret = lttng_ctl_ask_sessiond_varlen(&lsm, uris,
1459 sizeof(struct lttng_uri) * size, NULL);
3dd05a85
DG
1460
1461 free(uris);
1462 return ret;
00e2e675
DG
1463}
1464
8028d920 1465/*
8028d920 1466 * Destroy session using name.
1c8d13c8 1467 * Returns size of returned session payload data or a negative error code.
8028d920 1468 */
843f5df9 1469int lttng_destroy_session(const char *session_name)
8028d920 1470{
cd80958d
DG
1471 struct lttcomm_session_msg lsm;
1472
843f5df9 1473 if (session_name == NULL) {
2f70b271 1474 return -LTTNG_ERR_INVALID;
cd80958d
DG
1475 }
1476
53efb85a 1477 memset(&lsm, 0, sizeof(lsm));
cd80958d 1478 lsm.cmd_type = LTTNG_DESTROY_SESSION;
843f5df9 1479
cac3069d
DG
1480 lttng_ctl_copy_string(lsm.session.name, session_name,
1481 sizeof(lsm.session.name));
cd80958d 1482
cac3069d 1483 return lttng_ctl_ask_sessiond(&lsm, NULL);
aaf97519
DG
1484}
1485
57167058 1486/*
57167058 1487 * Ask the session daemon for all available sessions.
1c8d13c8
TD
1488 * Sets the contents of the sessions array.
1489 * Returns the number of lttng_session entries in sessions;
1490 * on error, returns a negative value.
57167058 1491 */
ca95a216 1492int lttng_list_sessions(struct lttng_session **sessions)
57167058 1493{
ca95a216 1494 int ret;
cd80958d 1495 struct lttcomm_session_msg lsm;
57167058 1496
53efb85a 1497 memset(&lsm, 0, sizeof(lsm));
cd80958d 1498 lsm.cmd_type = LTTNG_LIST_SESSIONS;
cac3069d 1499 ret = lttng_ctl_ask_sessiond(&lsm, (void**) sessions);
57167058 1500 if (ret < 0) {
ca95a216 1501 return ret;
57167058
DG
1502 }
1503
ca95a216 1504 return ret / sizeof(struct lttng_session);
57167058
DG
1505}
1506
d7ba1388
MD
1507int lttng_set_session_shm_path(const char *session_name,
1508 const char *shm_path)
1509{
1510 struct lttcomm_session_msg lsm;
1511
1512 if (session_name == NULL) {
1513 return -LTTNG_ERR_INVALID;
1514 }
1515
1516 memset(&lsm, 0, sizeof(lsm));
1517 lsm.cmd_type = LTTNG_SET_SESSION_SHM_PATH;
1518
1519 lttng_ctl_copy_string(lsm.session.name, session_name,
1520 sizeof(lsm.session.name));
1521 lttng_ctl_copy_string(lsm.u.set_shm_path.shm_path, shm_path,
1522 sizeof(lsm.u.set_shm_path.shm_path));
1523
1524 return lttng_ctl_ask_sessiond(&lsm, NULL);
1525}
1526
9f19cc17 1527/*
1c8d13c8
TD
1528 * Ask the session daemon for all available domains of a session.
1529 * Sets the contents of the domains array.
1530 * Returns the number of lttng_domain entries in domains;
1531 * on error, returns a negative value.
9f19cc17 1532 */
330be774 1533int lttng_list_domains(const char *session_name,
cd80958d 1534 struct lttng_domain **domains)
9f19cc17
DG
1535{
1536 int ret;
cd80958d
DG
1537 struct lttcomm_session_msg lsm;
1538
330be774 1539 if (session_name == NULL) {
2f70b271 1540 return -LTTNG_ERR_INVALID;
cd80958d 1541 }
9f19cc17 1542
53efb85a 1543 memset(&lsm, 0, sizeof(lsm));
cd80958d
DG
1544 lsm.cmd_type = LTTNG_LIST_DOMAINS;
1545
cac3069d
DG
1546 lttng_ctl_copy_string(lsm.session.name, session_name,
1547 sizeof(lsm.session.name));
cd80958d 1548
cac3069d 1549 ret = lttng_ctl_ask_sessiond(&lsm, (void**) domains);
9f19cc17
DG
1550 if (ret < 0) {
1551 return ret;
1552 }
1553
1554 return ret / sizeof(struct lttng_domain);
1555}
1556
1557/*
1c8d13c8
TD
1558 * Ask the session daemon for all available channels of a session.
1559 * Sets the contents of the channels array.
1560 * Returns the number of lttng_channel entries in channels;
1561 * on error, returns a negative value.
9f19cc17 1562 */
cd80958d
DG
1563int lttng_list_channels(struct lttng_handle *handle,
1564 struct lttng_channel **channels)
9f19cc17
DG
1565{
1566 int ret;
cd80958d
DG
1567 struct lttcomm_session_msg lsm;
1568
9d697d3d 1569 if (handle == NULL) {
2f70b271 1570 return -LTTNG_ERR_INVALID;
cd80958d
DG
1571 }
1572
53efb85a 1573 memset(&lsm, 0, sizeof(lsm));
cd80958d 1574 lsm.cmd_type = LTTNG_LIST_CHANNELS;
cac3069d 1575 lttng_ctl_copy_string(lsm.session.name, handle->session_name,
cd80958d 1576 sizeof(lsm.session.name));
9f19cc17 1577
cac3069d 1578 lttng_ctl_copy_lttng_domain(&lsm.domain, &handle->domain);
9f19cc17 1579
cac3069d 1580 ret = lttng_ctl_ask_sessiond(&lsm, (void**) channels);
9f19cc17
DG
1581 if (ret < 0) {
1582 return ret;
1583 }
1584
1585 return ret / sizeof(struct lttng_channel);
1586}
1587
1588/*
1c8d13c8
TD
1589 * Ask the session daemon for all available events of a session channel.
1590 * Sets the contents of the events array.
1591 * Returns the number of lttng_event entries in events;
1592 * on error, returns a negative value.
9f19cc17 1593 */
cd80958d
DG
1594int lttng_list_events(struct lttng_handle *handle,
1595 const char *channel_name, struct lttng_event **events)
9f19cc17
DG
1596{
1597 int ret;
cd80958d 1598 struct lttcomm_session_msg lsm;
9f19cc17 1599
9d697d3d
DG
1600 /* Safety check. An handle and channel name are mandatory */
1601 if (handle == NULL || channel_name == NULL) {
2f70b271 1602 return -LTTNG_ERR_INVALID;
cd80958d
DG
1603 }
1604
53efb85a 1605 memset(&lsm, 0, sizeof(lsm));
cd80958d 1606 lsm.cmd_type = LTTNG_LIST_EVENTS;
cac3069d 1607 lttng_ctl_copy_string(lsm.session.name, handle->session_name,
cd80958d 1608 sizeof(lsm.session.name));
cac3069d 1609 lttng_ctl_copy_string(lsm.u.list.channel_name, channel_name,
cd80958d
DG
1610 sizeof(lsm.u.list.channel_name));
1611
cac3069d 1612 lttng_ctl_copy_lttng_domain(&lsm.domain, &handle->domain);
9f19cc17 1613
cac3069d 1614 ret = lttng_ctl_ask_sessiond(&lsm, (void**) events);
9f19cc17
DG
1615 if (ret < 0) {
1616 return ret;
1617 }
1618
1619 return ret / sizeof(struct lttng_event);
1620}
1621
fac6795d 1622/*
1c8d13c8
TD
1623 * Sets the tracing_group variable with name.
1624 * This function allocates memory pointed to by tracing_group.
1625 * On success, returns 0, on error, returns -1 (null name) or -ENOMEM.
fac6795d
DG
1626 */
1627int lttng_set_tracing_group(const char *name)
1628{
9d697d3d 1629 if (name == NULL) {
2f70b271 1630 return -LTTNG_ERR_INVALID;
9d697d3d
DG
1631 }
1632
fac6795d 1633 if (asprintf(&tracing_group, "%s", name) < 0) {
2f70b271 1634 return -LTTNG_ERR_FATAL;
fac6795d
DG
1635 }
1636
1637 return 0;
1638}
1639
d0254c7c 1640/*
af87c45a 1641 * Returns size of returned session payload data or a negative error code.
d0254c7c 1642 */
cd80958d 1643int lttng_calibrate(struct lttng_handle *handle,
d0254c7c
MD
1644 struct lttng_calibrate *calibrate)
1645{
cd80958d 1646 struct lttcomm_session_msg lsm;
d0254c7c 1647
9d697d3d
DG
1648 /* Safety check. NULL pointer are forbidden */
1649 if (handle == NULL || calibrate == NULL) {
2f70b271 1650 return -LTTNG_ERR_INVALID;
cd80958d 1651 }
d0254c7c 1652
53efb85a 1653 memset(&lsm, 0, sizeof(lsm));
cd80958d 1654 lsm.cmd_type = LTTNG_CALIBRATE;
cac3069d 1655 lttng_ctl_copy_lttng_domain(&lsm.domain, &handle->domain);
d0254c7c 1656
cd80958d
DG
1657 memcpy(&lsm.u.calibrate, calibrate, sizeof(lsm.u.calibrate));
1658
cac3069d 1659 return lttng_ctl_ask_sessiond(&lsm, NULL);
d0254c7c
MD
1660}
1661
5edd7e09
DG
1662/*
1663 * Set default channel attributes.
441c16a7 1664 * If either or both of the arguments are null, attr content is zeroe'd.
5edd7e09
DG
1665 */
1666void lttng_channel_set_default_attr(struct lttng_domain *domain,
1667 struct lttng_channel_attr *attr)
1668{
1669 /* Safety check */
1670 if (attr == NULL || domain == NULL) {
1671 return;
1672 }
1673
eacaa7a6
DS
1674 memset(attr, 0, sizeof(struct lttng_channel_attr));
1675
0a9c6494
DG
1676 /* Same for all domains. */
1677 attr->overwrite = DEFAULT_CHANNEL_OVERWRITE;
1678 attr->tracefile_size = DEFAULT_CHANNEL_TRACEFILE_SIZE;
1679 attr->tracefile_count = DEFAULT_CHANNEL_TRACEFILE_COUNT;
1680
5edd7e09
DG
1681 switch (domain->type) {
1682 case LTTNG_DOMAIN_KERNEL:
d92ff3ef
DG
1683 attr->switch_timer_interval = DEFAULT_KERNEL_CHANNEL_SWITCH_TIMER;
1684 attr->read_timer_interval = DEFAULT_KERNEL_CHANNEL_READ_TIMER;
3e230f92 1685 attr->subbuf_size = default_get_kernel_channel_subbuf_size();
5edd7e09
DG
1686 attr->num_subbuf = DEFAULT_KERNEL_CHANNEL_SUBBUF_NUM;
1687 attr->output = DEFAULT_KERNEL_CHANNEL_OUTPUT;
1688 break;
1689 case LTTNG_DOMAIN_UST:
0a9c6494
DG
1690 switch (domain->buf_type) {
1691 case LTTNG_BUFFER_PER_UID:
1692 attr->subbuf_size = default_get_ust_uid_channel_subbuf_size();
1693 attr->num_subbuf = DEFAULT_UST_UID_CHANNEL_SUBBUF_NUM;
1694 attr->output = DEFAULT_UST_UID_CHANNEL_OUTPUT;
1695 attr->switch_timer_interval = DEFAULT_UST_UID_CHANNEL_SWITCH_TIMER;
1696 attr->read_timer_interval = DEFAULT_UST_UID_CHANNEL_READ_TIMER;
1697 break;
1698 case LTTNG_BUFFER_PER_PID:
1699 default:
1700 attr->subbuf_size = default_get_ust_pid_channel_subbuf_size();
1701 attr->num_subbuf = DEFAULT_UST_PID_CHANNEL_SUBBUF_NUM;
1702 attr->output = DEFAULT_UST_PID_CHANNEL_OUTPUT;
1703 attr->switch_timer_interval = DEFAULT_UST_PID_CHANNEL_SWITCH_TIMER;
1704 attr->read_timer_interval = DEFAULT_UST_PID_CHANNEL_READ_TIMER;
1705 break;
1706 }
5edd7e09 1707 default:
441c16a7 1708 /* Default behavior: leave set to 0. */
5edd7e09
DG
1709 break;
1710 }
1711}
1712
fac6795d 1713/*
2269e89e 1714 * Check if session daemon is alive.
fac6795d 1715 *
2269e89e 1716 * Return 1 if alive or 0 if not.
1c8d13c8 1717 * On error returns a negative value.
fac6795d 1718 */
947308c4 1719int lttng_session_daemon_alive(void)
fac6795d
DG
1720{
1721 int ret;
1722
1723 ret = set_session_daemon_path();
1724 if (ret < 0) {
947308c4 1725 /* Error */
fac6795d
DG
1726 return ret;
1727 }
1728
9d035200 1729 if (*sessiond_sock_path == '\0') {
2f70b271
DG
1730 /*
1731 * No socket path set. Weird error which means the constructor was not
1732 * called.
1733 */
1734 assert(0);
fac6795d
DG
1735 }
1736
2269e89e 1737 ret = try_connect_sessiond(sessiond_sock_path);
7d8234d9
MD
1738 if (ret < 0) {
1739 /* Not alive */
1740 return 0;
1741 }
7d8234d9 1742
947308c4
DG
1743 /* Is alive */
1744 return 1;
fac6795d
DG
1745}
1746
00e2e675 1747/*
a4b92340 1748 * Set URL for a consumer for a session and domain.
00e2e675
DG
1749 *
1750 * Return 0 on success, else a negative value.
1751 */
a4b92340
DG
1752int lttng_set_consumer_url(struct lttng_handle *handle,
1753 const char *control_url, const char *data_url)
00e2e675 1754{
3dd05a85 1755 int ret;
a4b92340 1756 ssize_t size;
00e2e675 1757 struct lttcomm_session_msg lsm;
a4b92340 1758 struct lttng_uri *uris = NULL;
00e2e675 1759
a4b92340 1760 if (handle == NULL || (control_url == NULL && data_url == NULL)) {
2f70b271 1761 return -LTTNG_ERR_INVALID;
00e2e675
DG
1762 }
1763
a4b92340
DG
1764 memset(&lsm, 0, sizeof(lsm));
1765
00e2e675
DG
1766 lsm.cmd_type = LTTNG_SET_CONSUMER_URI;
1767
cac3069d 1768 lttng_ctl_copy_string(lsm.session.name, handle->session_name,
00e2e675 1769 sizeof(lsm.session.name));
cac3069d 1770 lttng_ctl_copy_lttng_domain(&lsm.domain, &handle->domain);
00e2e675 1771
bc894455 1772 size = uri_parse_str_urls(control_url, data_url, &uris);
a4b92340 1773 if (size < 0) {
2f70b271 1774 return -LTTNG_ERR_INVALID;
a4b92340
DG
1775 }
1776
1777 lsm.u.uri.size = size;
00e2e675 1778
cac3069d
DG
1779 ret = lttng_ctl_ask_sessiond_varlen(&lsm, uris,
1780 sizeof(struct lttng_uri) * size, NULL);
3dd05a85
DG
1781
1782 free(uris);
1783 return ret;
00e2e675
DG
1784}
1785
1786/*
9c6bda17 1787 * [OBSOLETE]
00e2e675
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1788 */
1789int lttng_enable_consumer(struct lttng_handle *handle)
1790{
785d2d0d 1791 return -ENOSYS;
00e2e675
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1792}
1793
1794/*
9c6bda17 1795 * [OBSOLETE]
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1796 */
1797int lttng_disable_consumer(struct lttng_handle *handle)
1798{
785d2d0d 1799 return -ENOSYS;
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1800}
1801
07424f16
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1802/*
1803 * This is an extension of create session that is ONLY and SHOULD only be used
1804 * by the lttng command line program. It exists to avoid using URI parsing in
1805 * the lttng client.
1806 *
1807 * We need the date and time for the trace path subdirectory for the case where
1808 * the user does NOT define one using either -o or -U. Using the normal
1809 * lttng_create_session API call, we have no clue on the session daemon side if
1810 * the URL was generated automatically by the client or define by the user.
1811 *
1812 * So this function "wrapper" is hidden from the public API, takes the datetime
1813 * string and appends it if necessary to the URI subdirectory before sending it
1814 * to the session daemon.
1815 *
1816 * With this extra function, the lttng_create_session call behavior is not
1817 * changed and the timestamp is appended to the URI on the session daemon side
1818 * if necessary.
1819 */
1820int _lttng_create_session_ext(const char *name, const char *url,
1821 const char *datetime)
1822{
3dd05a85 1823 int ret;
07424f16
DG
1824 ssize_t size;
1825 struct lttcomm_session_msg lsm;
1826 struct lttng_uri *uris = NULL;
1827
2bba9e53 1828 if (name == NULL || datetime == NULL) {
2f70b271 1829 return -LTTNG_ERR_INVALID;
07424f16
DG
1830 }
1831
1832 memset(&lsm, 0, sizeof(lsm));
1833
1834 lsm.cmd_type = LTTNG_CREATE_SESSION;
cac3069d 1835 lttng_ctl_copy_string(lsm.session.name, name, sizeof(lsm.session.name));
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DG
1836
1837 /* There should never be a data URL */
bc894455 1838 size = uri_parse_str_urls(url, NULL, &uris);
07424f16 1839 if (size < 0) {
3dd05a85
DG
1840 ret = -LTTNG_ERR_INVALID;
1841 goto error;
07424f16
DG
1842 }
1843
1844 lsm.u.uri.size = size;
1845
4b35a6b3 1846 if (size > 0 && uris[0].dtype != LTTNG_DST_PATH && strlen(uris[0].subdir) == 0) {
da4aa2b8
DG
1847 /* Don't append datetime if the name was automatically created. */
1848 if (strncmp(name, DEFAULT_SESSION_NAME "-",
1849 strlen(DEFAULT_SESSION_NAME) + 1)) {
1850 ret = snprintf(uris[0].subdir, sizeof(uris[0].subdir), "%s-%s",
1851 name, datetime);
1852 } else {
1853 ret = snprintf(uris[0].subdir, sizeof(uris[0].subdir), "%s", name);
1854 }
07424f16
DG
1855 if (ret < 0) {
1856 PERROR("snprintf uri subdir");
3dd05a85
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1857 ret = -LTTNG_ERR_FATAL;
1858 goto error;
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1859 }
1860 }
1861
cac3069d
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1862 ret = lttng_ctl_ask_sessiond_varlen(&lsm, uris,
1863 sizeof(struct lttng_uri) * size, NULL);
3dd05a85
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1864
1865error:
1866 free(uris);
1867 return ret;
07424f16
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1868}
1869
806e2684
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1870/*
1871 * For a given session name, this call checks if the data is ready to be read
1872 * or is still being extracted by the consumer(s) hence not ready to be used by
1873 * any readers.
1874 */
6d805429 1875int lttng_data_pending(const char *session_name)
806e2684
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1876{
1877 int ret;
1878 struct lttcomm_session_msg lsm;
f6151c55 1879 uint8_t *pending = NULL;
806e2684
DG
1880
1881 if (session_name == NULL) {
1882 return -LTTNG_ERR_INVALID;
1883 }
1884
53efb85a 1885 memset(&lsm, 0, sizeof(lsm));
6d805429 1886 lsm.cmd_type = LTTNG_DATA_PENDING;
806e2684 1887
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1888 lttng_ctl_copy_string(lsm.session.name, session_name,
1889 sizeof(lsm.session.name));
806e2684 1890
f6151c55
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1891 ret = lttng_ctl_ask_sessiond(&lsm, (void **) &pending);
1892 if (ret < 0) {
1893 goto end;
1894 } else if (ret != 1) {
1895 /* Unexpected payload size */
1896 ret = -LTTNG_ERR_INVALID;
1897 goto end;
806e2684
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1898 }
1899
f6151c55
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1900 ret = (int) *pending;
1901end:
1902 free(pending);
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1903 return ret;
1904}
1905
27babd3a
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1906/*
1907 * Create a session exclusively used for snapshot.
1908 *
1909 * Returns LTTNG_OK on success or a negative error code.
1910 */
1911int lttng_create_session_snapshot(const char *name, const char *snapshot_url)
1912{
1913 int ret;
1914 ssize_t size;
1915 struct lttcomm_session_msg lsm;
1916 struct lttng_uri *uris = NULL;
1917
1918 if (name == NULL) {
1919 return -LTTNG_ERR_INVALID;
1920 }
1921
1922 memset(&lsm, 0, sizeof(lsm));
1923
1924 lsm.cmd_type = LTTNG_CREATE_SESSION_SNAPSHOT;
1925 lttng_ctl_copy_string(lsm.session.name, name, sizeof(lsm.session.name));
1926
1927 size = uri_parse_str_urls(snapshot_url, NULL, &uris);
1928 if (size < 0) {
1929 return -LTTNG_ERR_INVALID;
1930 }
1931
1932 lsm.u.uri.size = size;
1933
1934 ret = lttng_ctl_ask_sessiond_varlen(&lsm, uris,
1935 sizeof(struct lttng_uri) * size, NULL);
1936
1937 free(uris);
1938 return ret;
1939}
1940
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1941/*
1942 * Create a session exclusively used for live.
1943 *
1944 * Returns LTTNG_OK on success or a negative error code.
1945 */
1946int lttng_create_session_live(const char *name, const char *url,
1947 unsigned int timer_interval)
1948{
1949 int ret;
1950 ssize_t size;
1951 struct lttcomm_session_msg lsm;
1952 struct lttng_uri *uris = NULL;
1953
92805ee4 1954 if (name == NULL || timer_interval == 0) {
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JD
1955 return -LTTNG_ERR_INVALID;
1956 }
1957
1958 memset(&lsm, 0, sizeof(lsm));
1959
1960 lsm.cmd_type = LTTNG_CREATE_SESSION_LIVE;
1961 lttng_ctl_copy_string(lsm.session.name, name, sizeof(lsm.session.name));
1962
1a241656
DG
1963 if (url) {
1964 size = uri_parse_str_urls(url, NULL, &uris);
1965 if (size <= 0) {
1966 ret = -LTTNG_ERR_INVALID;
1967 goto end;
1968 }
ecc48a90 1969
1a241656
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1970 /* file:// is not accepted for live session. */
1971 if (uris[0].dtype == LTTNG_DST_PATH) {
1972 ret = -LTTNG_ERR_INVALID;
1973 goto end;
1974 }
1975 } else {
1976 size = 0;
ecc48a90
JD
1977 }
1978
1979 lsm.u.session_live.nb_uri = size;
1980 lsm.u.session_live.timer_interval = timer_interval;
1981
1982 ret = lttng_ctl_ask_sessiond_varlen(&lsm, uris,
1983 sizeof(struct lttng_uri) * size, NULL);
1984
1985end:
1986 free(uris);
1987 return ret;
1988}
1989
a5dfbb9d
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1990/*
1991 * List PIDs in the tracker.
1992 *
1b18ce93
JG
1993 * enabled is set to whether the PID tracker is enabled.
1994 * pids is set to an allocated array of PIDs currently tracked. On
1995 * success, pids must be freed by the caller.
1996 * nr_pids is set to the number of entries contained by the pids array.
a5dfbb9d
MD
1997 *
1998 * Returns 0 on success, else a negative LTTng error code.
1999 */
2000int lttng_list_tracker_pids(struct lttng_handle *handle,
2001 int *_enabled, int32_t **_pids, size_t *_nr_pids)
2002{
ebbf5ab7
JR
2003 int ret;
2004 int enabled = 1;
a5dfbb9d
MD
2005 struct lttcomm_session_msg lsm;
2006 size_t nr_pids;
2007 int32_t *pids;
2008
2009 if (handle == NULL) {
2010 return -LTTNG_ERR_INVALID;
2011 }
2012
2013 memset(&lsm, 0, sizeof(lsm));
2014 lsm.cmd_type = LTTNG_LIST_TRACKER_PIDS;
2015 lttng_ctl_copy_string(lsm.session.name, handle->session_name,
2016 sizeof(lsm.session.name));
2017 lttng_ctl_copy_lttng_domain(&lsm.domain, &handle->domain);
2018
2019 ret = lttng_ctl_ask_sessiond(&lsm, (void **) &pids);
2020 if (ret < 0) {
2021 return ret;
2022 }
2023 nr_pids = ret / sizeof(int32_t);
2024 if (nr_pids == 1 && pids[0] == -1) {
2025 free(pids);
2026 pids = NULL;
2027 enabled = 0;
2028 nr_pids = 0;
2029 }
2030 *_enabled = enabled;
2031 *_pids = pids;
2032 *_nr_pids = nr_pids;
2033 return 0;
2034}
2035
fac6795d
DG
2036/*
2037 * lib constructor
2038 */
2039static void __attribute__((constructor)) init()
2040{
2041 /* Set default session group */
bbccc3d2 2042 lttng_set_tracing_group(DEFAULT_TRACING_GROUP);
fac6795d 2043}
49cca668
DG
2044
2045/*
2046 * lib destructor
2047 */
2048static void __attribute__((destructor)) lttng_ctl_exit()
2049{
2050 free(tracing_group);
2051}
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