38fe271b09b6ee4e112d8080f40c4b886a2786e8
[lttng-tools.git] / src / lib / lttng-ctl / lttng-ctl.c
1 /*
2 * liblttngctl.c
3 *
4 * Linux Trace Toolkit Control Library
5 *
6 * Copyright (C) 2011 David Goulet <david.goulet@polymtl.ca>
7 *
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.
11 *
12 * This library is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Lesser General Public License for more details.
16 *
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
20 */
21
22 #define _GNU_SOURCE
23 #include <assert.h>
24 #include <grp.h>
25 #include <errno.h>
26 #include <stdio.h>
27 #include <stdlib.h>
28 #include <string.h>
29 #include <unistd.h>
30
31 #include <common/common.h>
32 #include <common/defaults.h>
33 #include <common/sessiond-comm/sessiond-comm.h>
34 #include <common/uri.h>
35 #include <common/utils.h>
36 #include <lttng/lttng.h>
37 #include <lttng/health-internal.h>
38
39 #include "filter/filter-ast.h"
40 #include "filter/filter-parser.h"
41 #include "filter/filter-bytecode.h"
42 #include "filter/memstream.h"
43 #include "lttng-ctl-helper.h"
44
45 #ifdef DEBUG
46 static const int print_xml = 1;
47 #define dbg_printf(fmt, args...) \
48 printf("[debug liblttng-ctl] " fmt, ## args)
49 #else
50 static const int print_xml = 0;
51 #define dbg_printf(fmt, args...) \
52 do { \
53 /* do nothing but check printf format */ \
54 if (0) \
55 printf("[debug liblttnctl] " fmt, ## args); \
56 } while (0)
57 #endif
58
59
60 /* Socket to session daemon for communication */
61 static int sessiond_socket;
62 static char sessiond_sock_path[PATH_MAX];
63
64 /* Variables */
65 static char *tracing_group;
66 static int connected;
67
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.
74 */
75 int lttng_opt_quiet;
76 int lttng_opt_verbose;
77
78 /*
79 * Copy string from src to dst and enforce null terminated byte.
80 */
81 LTTNG_HIDDEN
82 void lttng_ctl_copy_string(char *dst, const char *src, size_t len)
83 {
84 if (src && dst) {
85 strncpy(dst, src, len);
86 /* Enforce the NULL terminated byte */
87 dst[len - 1] = '\0';
88 } else if (dst) {
89 dst[0] = '\0';
90 }
91 }
92
93 /*
94 * Copy domain to lttcomm_session_msg domain.
95 *
96 * If domain is unknown, default domain will be the kernel.
97 */
98 LTTNG_HIDDEN
99 void lttng_ctl_copy_lttng_domain(struct lttng_domain *dst,
100 struct lttng_domain *src)
101 {
102 if (src && dst) {
103 switch (src->type) {
104 case LTTNG_DOMAIN_KERNEL:
105 case LTTNG_DOMAIN_UST:
106 case LTTNG_DOMAIN_JUL:
107 memcpy(dst, src, sizeof(struct lttng_domain));
108 break;
109 default:
110 memset(dst, 0, sizeof(struct lttng_domain));
111 break;
112 }
113 }
114 }
115
116 /*
117 * Send lttcomm_session_msg to the session daemon.
118 *
119 * On success, returns the number of bytes sent (>=0)
120 * On error, returns -1
121 */
122 static int send_session_msg(struct lttcomm_session_msg *lsm)
123 {
124 int ret;
125
126 if (!connected) {
127 ret = -LTTNG_ERR_NO_SESSIOND;
128 goto end;
129 }
130
131 DBG("LSM cmd type : %d", lsm->cmd_type);
132
133 ret = lttcomm_send_creds_unix_sock(sessiond_socket, lsm,
134 sizeof(struct lttcomm_session_msg));
135 if (ret < 0) {
136 ret = -LTTNG_ERR_FATAL;
137 }
138
139 end:
140 return ret;
141 }
142
143 /*
144 * Send var len data to the session daemon.
145 *
146 * On success, returns the number of bytes sent (>=0)
147 * On error, returns -1
148 */
149 static int send_session_varlen(void *data, size_t len)
150 {
151 int ret;
152
153 if (!connected) {
154 ret = -LTTNG_ERR_NO_SESSIOND;
155 goto end;
156 }
157
158 if (!data || !len) {
159 ret = 0;
160 goto end;
161 }
162
163 ret = lttcomm_send_unix_sock(sessiond_socket, data, len);
164 if (ret < 0) {
165 ret = -LTTNG_ERR_FATAL;
166 }
167
168 end:
169 return ret;
170 }
171
172 /*
173 * Receive data from the sessiond socket.
174 *
175 * On success, returns the number of bytes received (>=0)
176 * On error, returns -1 (recvmsg() error) or -ENOTCONN
177 */
178 static int recv_data_sessiond(void *buf, size_t len)
179 {
180 int ret;
181
182 if (!connected) {
183 ret = -LTTNG_ERR_NO_SESSIOND;
184 goto end;
185 }
186
187 ret = lttcomm_recv_unix_sock(sessiond_socket, buf, len);
188 if (ret < 0) {
189 ret = -LTTNG_ERR_FATAL;
190 }
191
192 end:
193 return ret;
194 }
195
196 /*
197 * Check if we are in the specified group.
198 *
199 * If yes return 1, else return -1.
200 */
201 LTTNG_HIDDEN
202 int lttng_check_tracing_group(void)
203 {
204 struct group *grp_tracing; /* no free(). See getgrnam(3) */
205 gid_t *grp_list;
206 int grp_list_size, grp_id, i;
207 int ret = -1;
208 const char *grp_name = tracing_group;
209
210 /* Get GID of group 'tracing' */
211 grp_tracing = getgrnam(grp_name);
212 if (!grp_tracing) {
213 /* If grp_tracing is NULL, the group does not exist. */
214 goto end;
215 }
216
217 /* Get number of supplementary group IDs */
218 grp_list_size = getgroups(0, NULL);
219 if (grp_list_size < 0) {
220 perror("getgroups");
221 goto end;
222 }
223
224 /* Alloc group list of the right size */
225 grp_list = malloc(grp_list_size * sizeof(gid_t));
226 if (!grp_list) {
227 perror("malloc");
228 goto end;
229 }
230 grp_id = getgroups(grp_list_size, grp_list);
231 if (grp_id < 0) {
232 perror("getgroups");
233 goto free_list;
234 }
235
236 for (i = 0; i < grp_list_size; i++) {
237 if (grp_list[i] == grp_tracing->gr_gid) {
238 ret = 1;
239 break;
240 }
241 }
242
243 free_list:
244 free(grp_list);
245
246 end:
247 return ret;
248 }
249
250 /*
251 * Try connect to session daemon with sock_path.
252 *
253 * Return 0 on success, else -1
254 */
255 static int try_connect_sessiond(const char *sock_path)
256 {
257 int ret;
258
259 /* If socket exist, we check if the daemon listens for connect. */
260 ret = access(sock_path, F_OK);
261 if (ret < 0) {
262 /* Not alive */
263 goto error;
264 }
265
266 ret = lttcomm_connect_unix_sock(sock_path);
267 if (ret < 0) {
268 /* Not alive */
269 goto error;
270 }
271
272 ret = lttcomm_close_unix_sock(ret);
273 if (ret < 0) {
274 perror("lttcomm_close_unix_sock");
275 }
276
277 return 0;
278
279 error:
280 return -1;
281 }
282
283 /*
284 * Set sessiond socket path by putting it in the global sessiond_sock_path
285 * variable.
286 *
287 * Returns 0 on success, negative value on failure (the sessiond socket path
288 * is somehow too long or ENOMEM).
289 */
290 static int set_session_daemon_path(void)
291 {
292 int in_tgroup = 0; /* In tracing group */
293 uid_t uid;
294
295 uid = getuid();
296
297 if (uid != 0) {
298 /* Are we in the tracing group ? */
299 in_tgroup = lttng_check_tracing_group();
300 }
301
302 if ((uid == 0) || in_tgroup) {
303 lttng_ctl_copy_string(sessiond_sock_path,
304 DEFAULT_GLOBAL_CLIENT_UNIX_SOCK, sizeof(sessiond_sock_path));
305 }
306
307 if (uid != 0) {
308 int ret;
309
310 if (in_tgroup) {
311 /* Tracing group */
312 ret = try_connect_sessiond(sessiond_sock_path);
313 if (ret >= 0) {
314 goto end;
315 }
316 /* Global session daemon not available... */
317 }
318 /* ...or not in tracing group (and not root), default */
319
320 /*
321 * With GNU C < 2.1, snprintf returns -1 if the target buffer is too small;
322 * With GNU C >= 2.1, snprintf returns the required size (excluding closing null)
323 */
324 ret = snprintf(sessiond_sock_path, sizeof(sessiond_sock_path),
325 DEFAULT_HOME_CLIENT_UNIX_SOCK, utils_get_home_dir());
326 if ((ret < 0) || (ret >= sizeof(sessiond_sock_path))) {
327 goto error;
328 }
329 }
330 end:
331 return 0;
332
333 error:
334 return -1;
335 }
336
337 /*
338 * Connect to the LTTng session daemon.
339 *
340 * On success, return 0. On error, return -1.
341 */
342 static int connect_sessiond(void)
343 {
344 int ret;
345
346 /* Don't try to connect if already connected. */
347 if (connected) {
348 return 0;
349 }
350
351 ret = set_session_daemon_path();
352 if (ret < 0) {
353 goto error;
354 }
355
356 /* Connect to the sesssion daemon */
357 ret = lttcomm_connect_unix_sock(sessiond_sock_path);
358 if (ret < 0) {
359 goto error;
360 }
361
362 sessiond_socket = ret;
363 connected = 1;
364
365 return 0;
366
367 error:
368 return -1;
369 }
370
371 /*
372 * Clean disconnect from the session daemon.
373 * On success, return 0. On error, return -1.
374 */
375 static int disconnect_sessiond(void)
376 {
377 int ret = 0;
378
379 if (connected) {
380 ret = lttcomm_close_unix_sock(sessiond_socket);
381 sessiond_socket = 0;
382 connected = 0;
383 }
384
385 return ret;
386 }
387
388 /*
389 * Ask the session daemon a specific command and put the data into buf.
390 * Takes extra var. len. data as input to send to the session daemon.
391 *
392 * Return size of data (only payload, not header) or a negative error code.
393 */
394 LTTNG_HIDDEN
395 int lttng_ctl_ask_sessiond_varlen(struct lttcomm_session_msg *lsm,
396 void *vardata, size_t varlen, void **buf)
397 {
398 int ret;
399 size_t size;
400 void *data = NULL;
401 struct lttcomm_lttng_msg llm;
402
403 ret = connect_sessiond();
404 if (ret < 0) {
405 ret = -LTTNG_ERR_NO_SESSIOND;
406 goto end;
407 }
408
409 /* Send command to session daemon */
410 ret = send_session_msg(lsm);
411 if (ret < 0) {
412 /* Ret value is a valid lttng error code. */
413 goto end;
414 }
415 /* Send var len data */
416 ret = send_session_varlen(vardata, varlen);
417 if (ret < 0) {
418 /* Ret value is a valid lttng error code. */
419 goto end;
420 }
421
422 /* Get header from data transmission */
423 ret = recv_data_sessiond(&llm, sizeof(llm));
424 if (ret < 0) {
425 /* Ret value is a valid lttng error code. */
426 goto end;
427 }
428
429 /* Check error code if OK */
430 if (llm.ret_code != LTTNG_OK) {
431 ret = -llm.ret_code;
432 goto end;
433 }
434
435 size = llm.data_size;
436 if (size == 0) {
437 /* If client free with size 0 */
438 if (buf != NULL) {
439 *buf = NULL;
440 }
441 ret = 0;
442 goto end;
443 }
444
445 data = (void*) malloc(size);
446
447 /* Get payload data */
448 ret = recv_data_sessiond(data, size);
449 if (ret < 0) {
450 free(data);
451 goto end;
452 }
453
454 /*
455 * Extra protection not to dereference a NULL pointer. If buf is NULL at
456 * this point, an error is returned and data is freed.
457 */
458 if (buf == NULL) {
459 ret = -LTTNG_ERR_INVALID;
460 free(data);
461 goto end;
462 }
463
464 *buf = data;
465 ret = size;
466
467 end:
468 disconnect_sessiond();
469 return ret;
470 }
471
472 /*
473 * Create lttng handle and return pointer.
474 * The returned pointer will be NULL in case of malloc() error.
475 */
476 struct lttng_handle *lttng_create_handle(const char *session_name,
477 struct lttng_domain *domain)
478 {
479 struct lttng_handle *handle = NULL;
480
481 if (domain == NULL) {
482 goto end;
483 }
484
485 handle = malloc(sizeof(struct lttng_handle));
486 if (handle == NULL) {
487 PERROR("malloc handle");
488 goto end;
489 }
490
491 /* Copy session name */
492 lttng_ctl_copy_string(handle->session_name, session_name,
493 sizeof(handle->session_name));
494
495 /* Copy lttng domain */
496 lttng_ctl_copy_lttng_domain(&handle->domain, domain);
497
498 end:
499 return handle;
500 }
501
502 /*
503 * Destroy handle by free(3) the pointer.
504 */
505 void lttng_destroy_handle(struct lttng_handle *handle)
506 {
507 free(handle);
508 }
509
510 /*
511 * Register an outside consumer.
512 * Returns size of returned session payload data or a negative error code.
513 */
514 int lttng_register_consumer(struct lttng_handle *handle,
515 const char *socket_path)
516 {
517 struct lttcomm_session_msg lsm;
518
519 if (handle == NULL || socket_path == NULL) {
520 return -LTTNG_ERR_INVALID;
521 }
522
523 memset(&lsm, 0, sizeof(lsm));
524 lsm.cmd_type = LTTNG_REGISTER_CONSUMER;
525 lttng_ctl_copy_string(lsm.session.name, handle->session_name,
526 sizeof(lsm.session.name));
527 lttng_ctl_copy_lttng_domain(&lsm.domain, &handle->domain);
528
529 lttng_ctl_copy_string(lsm.u.reg.path, socket_path, sizeof(lsm.u.reg.path));
530
531 return lttng_ctl_ask_sessiond(&lsm, NULL);
532 }
533
534 /*
535 * Start tracing for all traces of the session.
536 * Returns size of returned session payload data or a negative error code.
537 */
538 int lttng_start_tracing(const char *session_name)
539 {
540 struct lttcomm_session_msg lsm;
541
542 if (session_name == NULL) {
543 return -LTTNG_ERR_INVALID;
544 }
545
546 memset(&lsm, 0, sizeof(lsm));
547 lsm.cmd_type = LTTNG_START_TRACE;
548
549 lttng_ctl_copy_string(lsm.session.name, session_name,
550 sizeof(lsm.session.name));
551
552 return lttng_ctl_ask_sessiond(&lsm, NULL);
553 }
554
555 /*
556 * Stop tracing for all traces of the session.
557 */
558 static int _lttng_stop_tracing(const char *session_name, int wait)
559 {
560 int ret, data_ret;
561 struct lttcomm_session_msg lsm;
562
563 if (session_name == NULL) {
564 return -LTTNG_ERR_INVALID;
565 }
566
567 memset(&lsm, 0, sizeof(lsm));
568 lsm.cmd_type = LTTNG_STOP_TRACE;
569
570 lttng_ctl_copy_string(lsm.session.name, session_name,
571 sizeof(lsm.session.name));
572
573 ret = lttng_ctl_ask_sessiond(&lsm, NULL);
574 if (ret < 0 && ret != -LTTNG_ERR_TRACE_ALREADY_STOPPED) {
575 goto error;
576 }
577
578 if (!wait) {
579 goto end;
580 }
581
582 /* Check for data availability */
583 do {
584 data_ret = lttng_data_pending(session_name);
585 if (data_ret < 0) {
586 /* Return the data available call error. */
587 ret = data_ret;
588 goto error;
589 }
590
591 /*
592 * Data sleep time before retrying (in usec). Don't sleep if the call
593 * returned value indicates availability.
594 */
595 if (data_ret) {
596 usleep(DEFAULT_DATA_AVAILABILITY_WAIT_TIME);
597 }
598 } while (data_ret != 0);
599
600 end:
601 error:
602 return ret;
603 }
604
605 /*
606 * Stop tracing and wait for data availability.
607 */
608 int lttng_stop_tracing(const char *session_name)
609 {
610 return _lttng_stop_tracing(session_name, 1);
611 }
612
613 /*
614 * Stop tracing but _don't_ wait for data availability.
615 */
616 int lttng_stop_tracing_no_wait(const char *session_name)
617 {
618 return _lttng_stop_tracing(session_name, 0);
619 }
620
621 /*
622 * Add context to a channel.
623 *
624 * If the given channel is NULL, add the contexts to all channels.
625 * The event_name param is ignored.
626 *
627 * Returns the size of the returned payload data or a negative error code.
628 */
629 int lttng_add_context(struct lttng_handle *handle,
630 struct lttng_event_context *ctx, const char *event_name,
631 const char *channel_name)
632 {
633 struct lttcomm_session_msg lsm;
634
635 /* Safety check. Both are mandatory */
636 if (handle == NULL || ctx == NULL) {
637 return -LTTNG_ERR_INVALID;
638 }
639
640 memset(&lsm, 0, sizeof(lsm));
641
642 lsm.cmd_type = LTTNG_ADD_CONTEXT;
643
644 /* If no channel name, send empty string. */
645 if (channel_name == NULL) {
646 lttng_ctl_copy_string(lsm.u.context.channel_name, "",
647 sizeof(lsm.u.context.channel_name));
648 } else {
649 lttng_ctl_copy_string(lsm.u.context.channel_name, channel_name,
650 sizeof(lsm.u.context.channel_name));
651 }
652
653 lttng_ctl_copy_lttng_domain(&lsm.domain, &handle->domain);
654
655 memcpy(&lsm.u.context.ctx, ctx, sizeof(struct lttng_event_context));
656
657 lttng_ctl_copy_string(lsm.session.name, handle->session_name,
658 sizeof(lsm.session.name));
659
660 return lttng_ctl_ask_sessiond(&lsm, NULL);
661 }
662
663 /*
664 * Enable event(s) for a channel.
665 * If no event name is specified, all events are enabled.
666 * If no channel name is specified, the default 'channel0' is used.
667 * Returns size of returned session payload data or a negative error code.
668 */
669 int lttng_enable_event(struct lttng_handle *handle,
670 struct lttng_event *ev, const char *channel_name)
671 {
672 return lttng_enable_event_with_exclusions(handle, ev, channel_name,
673 NULL, 0, NULL);
674 }
675
676 /*
677 * Create or enable an event with a filter expression.
678 *
679 * Return negative error value on error.
680 * Return size of returned session payload data if OK.
681 */
682 int lttng_enable_event_with_filter(struct lttng_handle *handle,
683 struct lttng_event *event, const char *channel_name,
684 const char *filter_expression)
685 {
686 return lttng_enable_event_with_exclusions(handle, event, channel_name,
687 filter_expression, 0, NULL);
688 }
689
690 /*
691 * Enable event(s) for a channel, possibly with exclusions and a filter.
692 * If no event name is specified, all events are enabled.
693 * If no channel name is specified, the default name is used.
694 * If filter expression is not NULL, the filter is set for the event.
695 * If exclusion count is not zero, the exclusions are set for the event.
696 * Returns size of returned session payload data or a negative error code.
697 */
698 int lttng_enable_event_with_exclusions(struct lttng_handle *handle,
699 struct lttng_event *ev, const char *channel_name,
700 const char *filter_expression,
701 int exclusion_count, char **exclusion_list)
702 {
703 struct lttcomm_session_msg lsm;
704 char *varlen_data, *jul_filter = NULL;
705 int ret = 0;
706 struct filter_parser_ctx *ctx = NULL;
707 FILE *fmem = NULL;
708
709 if (handle == NULL || ev == NULL) {
710 return -LTTNG_ERR_INVALID;
711 }
712
713 /* Empty filter string will always be rejected by the parser
714 * anyway, so treat this corner-case early to eliminate
715 * lttng_fmemopen error for 0-byte allocation.
716 */
717 if (filter_expression && filter_expression[0] == '\0') {
718 return -LTTNG_ERR_INVALID;
719 }
720
721 memset(&lsm, 0, sizeof(lsm));
722
723 /* If no channel name, send empty string. */
724 if (channel_name == NULL) {
725 lttng_ctl_copy_string(lsm.u.enable.channel_name, "",
726 sizeof(lsm.u.enable.channel_name));
727 } else {
728 lttng_ctl_copy_string(lsm.u.enable.channel_name, channel_name,
729 sizeof(lsm.u.enable.channel_name));
730 }
731
732 if (ev->name[0] != '\0') {
733 lsm.cmd_type = LTTNG_ENABLE_EVENT;
734 } else {
735 lsm.cmd_type = LTTNG_ENABLE_ALL_EVENT;
736 }
737
738 lttng_ctl_copy_lttng_domain(&lsm.domain, &handle->domain);
739 memcpy(&lsm.u.enable.event, ev, sizeof(lsm.u.enable.event));
740
741 lttng_ctl_copy_string(lsm.session.name, handle->session_name,
742 sizeof(lsm.session.name));
743 lsm.u.enable.exclusion_count = exclusion_count;
744 lsm.u.enable.bytecode_len = 0;
745
746 /*
747 * For the JUL domain, a filter is enforced except for the enable all
748 * event. This is done to avoid having the event in all sessions thus
749 * filtering by logger name.
750 */
751 if (exclusion_count == 0 && filter_expression == NULL &&
752 handle->domain.type != LTTNG_DOMAIN_JUL) {
753 goto ask_sessiond;
754 }
755
756 /*
757 * We have either a filter or some exclusions, so we need to set up
758 * a variable-length memory block from where to send the data
759 */
760
761 /* Parse filter expression */
762 if (filter_expression != NULL || handle->domain.type == LTTNG_DOMAIN_JUL) {
763 if (handle->domain.type == LTTNG_DOMAIN_JUL) {
764 int err;
765
766 if (ev->name[0] != '*') {
767 if (filter_expression) {
768 err = asprintf(&jul_filter, "%s && logger_name == \"%s\"",
769 filter_expression, ev->name);
770 } else {
771 err = asprintf(&jul_filter, "logger_name == \"%s\"",
772 ev->name);
773 }
774 if (err < 0) {
775 PERROR("asprintf");
776 return -LTTNG_ERR_NOMEM;
777 }
778 filter_expression = jul_filter;
779 }
780
781 /* Add loglevel filtering if any for the JUL domain. */
782 if (ev->loglevel_type != LTTNG_EVENT_LOGLEVEL_ALL) {
783 char *op;
784
785 if (ev->loglevel_type == LTTNG_EVENT_LOGLEVEL_RANGE) {
786 op = ">=";
787 } else {
788 op = "==";
789 }
790
791 if (filter_expression) {
792 err = asprintf(&jul_filter, "%s && int_loglevel %s %d",
793 filter_expression, op, ev->loglevel);
794 } else {
795 err = asprintf(&jul_filter, "int_loglevel %s %d", op,
796 ev->loglevel);
797 }
798 if (err < 0) {
799 PERROR("asprintf");
800 return -LTTNG_ERR_NOMEM;
801 }
802 filter_expression = jul_filter;
803 }
804
805 if (!filter_expression) {
806 goto ask_sessiond;
807 }
808 }
809
810 /*
811 * casting const to non-const, as the underlying function will
812 * use it in read-only mode.
813 */
814 fmem = lttng_fmemopen((void *) filter_expression,
815 strlen(filter_expression), "r");
816 if (!fmem) {
817 fprintf(stderr, "Error opening memory as stream\n");
818 free(jul_filter);
819 return -LTTNG_ERR_FILTER_NOMEM;
820 }
821 ctx = filter_parser_ctx_alloc(fmem);
822 if (!ctx) {
823 fprintf(stderr, "Error allocating parser\n");
824 ret = -LTTNG_ERR_FILTER_NOMEM;
825 goto filter_alloc_error;
826 }
827 ret = filter_parser_ctx_append_ast(ctx);
828 if (ret) {
829 fprintf(stderr, "Parse error\n");
830 ret = -LTTNG_ERR_FILTER_INVAL;
831 goto parse_error;
832 }
833 ret = filter_visitor_set_parent(ctx);
834 if (ret) {
835 fprintf(stderr, "Set parent error\n");
836 ret = -LTTNG_ERR_FILTER_INVAL;
837 goto parse_error;
838 }
839 if (print_xml) {
840 ret = filter_visitor_print_xml(ctx, stdout, 0);
841 if (ret) {
842 fflush(stdout);
843 fprintf(stderr, "XML print error\n");
844 ret = -LTTNG_ERR_FILTER_INVAL;
845 goto parse_error;
846 }
847 }
848
849 dbg_printf("Generating IR... ");
850 fflush(stdout);
851 ret = filter_visitor_ir_generate(ctx);
852 if (ret) {
853 fprintf(stderr, "Generate IR error\n");
854 ret = -LTTNG_ERR_FILTER_INVAL;
855 goto parse_error;
856 }
857 dbg_printf("done\n");
858
859 dbg_printf("Validating IR... ");
860 fflush(stdout);
861 ret = filter_visitor_ir_check_binary_op_nesting(ctx);
862 if (ret) {
863 ret = -LTTNG_ERR_FILTER_INVAL;
864 goto parse_error;
865 }
866 dbg_printf("done\n");
867
868 dbg_printf("Generating bytecode... ");
869 fflush(stdout);
870 ret = filter_visitor_bytecode_generate(ctx);
871 if (ret) {
872 fprintf(stderr, "Generate bytecode error\n");
873 ret = -LTTNG_ERR_FILTER_INVAL;
874 goto parse_error;
875 }
876 dbg_printf("done\n");
877 dbg_printf("Size of bytecode generated: %u bytes.\n",
878 bytecode_get_len(&ctx->bytecode->b));
879
880 lsm.u.enable.bytecode_len = sizeof(ctx->bytecode->b)
881 + bytecode_get_len(&ctx->bytecode->b);
882 lsm.u.enable.expression_len = strlen(filter_expression) + 1;
883 }
884
885 varlen_data = zmalloc(lsm.u.enable.bytecode_len
886 + lsm.u.enable.expression_len
887 + LTTNG_SYMBOL_NAME_LEN * exclusion_count);
888 if (!varlen_data) {
889 ret = -LTTNG_ERR_EXCLUSION_NOMEM;
890 goto varlen_alloc_error;
891 }
892 /* Put exclusion names first in the data */
893 while (exclusion_count--) {
894 strncpy(varlen_data + LTTNG_SYMBOL_NAME_LEN * exclusion_count,
895 *(exclusion_list + exclusion_count),
896 LTTNG_SYMBOL_NAME_LEN);
897 }
898 /* Add filter expression next */
899 if (lsm.u.enable.expression_len != 0) {
900 memcpy(varlen_data
901 + LTTNG_SYMBOL_NAME_LEN * lsm.u.enable.exclusion_count,
902 filter_expression,
903 lsm.u.enable.expression_len);
904 }
905 /* Add filter bytecode next */
906 if (lsm.u.enable.bytecode_len != 0) {
907 memcpy(varlen_data
908 + LTTNG_SYMBOL_NAME_LEN * lsm.u.enable.exclusion_count
909 + lsm.u.enable.expression_len,
910 &ctx->bytecode->b,
911 lsm.u.enable.bytecode_len);
912 }
913
914 ret = lttng_ctl_ask_sessiond_varlen(&lsm, varlen_data,
915 (LTTNG_SYMBOL_NAME_LEN * lsm.u.enable.exclusion_count) +
916 lsm.u.enable.bytecode_len + lsm.u.enable.expression_len,
917 NULL);
918 free(varlen_data);
919
920 varlen_alloc_error:
921 if (filter_expression) {
922 filter_bytecode_free(ctx);
923 filter_ir_free(ctx);
924 filter_parser_ctx_free(ctx);
925 if (fclose(fmem) != 0) {
926 perror("fclose");
927 }
928 }
929 free(jul_filter);
930 return ret;
931
932 parse_error:
933 filter_bytecode_free(ctx);
934 filter_ir_free(ctx);
935 filter_parser_ctx_free(ctx);
936 filter_alloc_error:
937 if (fclose(fmem) != 0) {
938 perror("fclose");
939 }
940 free(jul_filter);
941 return ret;
942
943 ask_sessiond:
944 ret = lttng_ctl_ask_sessiond(&lsm, NULL);
945 return ret;
946 }
947
948 /*
949 * Disable event(s) of a channel and domain.
950 * If no event name is specified, all events are disabled.
951 * If no channel name is specified, the default 'channel0' is used.
952 * Returns size of returned session payload data or a negative error code.
953 */
954 int lttng_disable_event(struct lttng_handle *handle, const char *name,
955 const char *channel_name)
956 {
957 struct lttcomm_session_msg lsm;
958
959 if (handle == NULL) {
960 return -LTTNG_ERR_INVALID;
961 }
962
963 memset(&lsm, 0, sizeof(lsm));
964
965 /* If no channel name, send empty string. */
966 if (channel_name == NULL) {
967 lttng_ctl_copy_string(lsm.u.disable.channel_name, "",
968 sizeof(lsm.u.disable.channel_name));
969 } else {
970 lttng_ctl_copy_string(lsm.u.disable.channel_name, channel_name,
971 sizeof(lsm.u.disable.channel_name));
972 }
973
974 lttng_ctl_copy_lttng_domain(&lsm.domain, &handle->domain);
975
976 if (name != NULL) {
977 lttng_ctl_copy_string(lsm.u.disable.name, name,
978 sizeof(lsm.u.disable.name));
979 lsm.cmd_type = LTTNG_DISABLE_EVENT;
980 } else {
981 lsm.cmd_type = LTTNG_DISABLE_ALL_EVENT;
982 }
983
984 lttng_ctl_copy_string(lsm.session.name, handle->session_name,
985 sizeof(lsm.session.name));
986
987 return lttng_ctl_ask_sessiond(&lsm, NULL);
988 }
989
990 /*
991 * Enable channel per domain
992 * Returns size of returned session payload data or a negative error code.
993 */
994 int lttng_enable_channel(struct lttng_handle *handle,
995 struct lttng_channel *chan)
996 {
997 struct lttcomm_session_msg lsm;
998
999 /*
1000 * NULL arguments are forbidden. No default values.
1001 */
1002 if (handle == NULL || chan == NULL) {
1003 return -LTTNG_ERR_INVALID;
1004 }
1005
1006 memset(&lsm, 0, sizeof(lsm));
1007
1008 memcpy(&lsm.u.channel.chan, chan, sizeof(lsm.u.channel.chan));
1009
1010 lsm.cmd_type = LTTNG_ENABLE_CHANNEL;
1011
1012 lttng_ctl_copy_lttng_domain(&lsm.domain, &handle->domain);
1013
1014 lttng_ctl_copy_string(lsm.session.name, handle->session_name,
1015 sizeof(lsm.session.name));
1016
1017 return lttng_ctl_ask_sessiond(&lsm, NULL);
1018 }
1019
1020 /*
1021 * All tracing will be stopped for registered events of the channel.
1022 * Returns size of returned session payload data or a negative error code.
1023 */
1024 int lttng_disable_channel(struct lttng_handle *handle, const char *name)
1025 {
1026 struct lttcomm_session_msg lsm;
1027
1028 /* Safety check. Both are mandatory */
1029 if (handle == NULL || name == NULL) {
1030 return -LTTNG_ERR_INVALID;
1031 }
1032
1033 memset(&lsm, 0, sizeof(lsm));
1034
1035 lsm.cmd_type = LTTNG_DISABLE_CHANNEL;
1036
1037 lttng_ctl_copy_string(lsm.u.disable.channel_name, name,
1038 sizeof(lsm.u.disable.channel_name));
1039
1040 lttng_ctl_copy_lttng_domain(&lsm.domain, &handle->domain);
1041
1042 lttng_ctl_copy_string(lsm.session.name, handle->session_name,
1043 sizeof(lsm.session.name));
1044
1045 return lttng_ctl_ask_sessiond(&lsm, NULL);
1046 }
1047
1048 /*
1049 * Lists all available tracepoints of domain.
1050 * Sets the contents of the events array.
1051 * Returns the number of lttng_event entries in events;
1052 * on error, returns a negative value.
1053 */
1054 int lttng_list_tracepoints(struct lttng_handle *handle,
1055 struct lttng_event **events)
1056 {
1057 int ret;
1058 struct lttcomm_session_msg lsm;
1059
1060 if (handle == NULL) {
1061 return -LTTNG_ERR_INVALID;
1062 }
1063
1064 memset(&lsm, 0, sizeof(lsm));
1065 lsm.cmd_type = LTTNG_LIST_TRACEPOINTS;
1066 lttng_ctl_copy_lttng_domain(&lsm.domain, &handle->domain);
1067
1068 ret = lttng_ctl_ask_sessiond(&lsm, (void **) events);
1069 if (ret < 0) {
1070 return ret;
1071 }
1072
1073 return ret / sizeof(struct lttng_event);
1074 }
1075
1076 /*
1077 * Lists all available tracepoint fields of domain.
1078 * Sets the contents of the event field array.
1079 * Returns the number of lttng_event_field entries in events;
1080 * on error, returns a negative value.
1081 */
1082 int lttng_list_tracepoint_fields(struct lttng_handle *handle,
1083 struct lttng_event_field **fields)
1084 {
1085 int ret;
1086 struct lttcomm_session_msg lsm;
1087
1088 if (handle == NULL) {
1089 return -LTTNG_ERR_INVALID;
1090 }
1091
1092 memset(&lsm, 0, sizeof(lsm));
1093 lsm.cmd_type = LTTNG_LIST_TRACEPOINT_FIELDS;
1094 lttng_ctl_copy_lttng_domain(&lsm.domain, &handle->domain);
1095
1096 ret = lttng_ctl_ask_sessiond(&lsm, (void **) fields);
1097 if (ret < 0) {
1098 return ret;
1099 }
1100
1101 return ret / sizeof(struct lttng_event_field);
1102 }
1103
1104 /*
1105 * Returns a human readable string describing
1106 * the error code (a negative value).
1107 */
1108 const char *lttng_strerror(int code)
1109 {
1110 return error_get_str(code);
1111 }
1112
1113 /*
1114 * Create a brand new session using name and url for destination.
1115 *
1116 * Returns LTTNG_OK on success or a negative error code.
1117 */
1118 int lttng_create_session(const char *name, const char *url)
1119 {
1120 int ret;
1121 ssize_t size;
1122 struct lttcomm_session_msg lsm;
1123 struct lttng_uri *uris = NULL;
1124
1125 if (name == NULL) {
1126 return -LTTNG_ERR_INVALID;
1127 }
1128
1129 memset(&lsm, 0, sizeof(lsm));
1130
1131 lsm.cmd_type = LTTNG_CREATE_SESSION;
1132 lttng_ctl_copy_string(lsm.session.name, name, sizeof(lsm.session.name));
1133
1134 /* There should never be a data URL */
1135 size = uri_parse_str_urls(url, NULL, &uris);
1136 if (size < 0) {
1137 return -LTTNG_ERR_INVALID;
1138 }
1139
1140 lsm.u.uri.size = size;
1141
1142 ret = lttng_ctl_ask_sessiond_varlen(&lsm, uris,
1143 sizeof(struct lttng_uri) * size, NULL);
1144
1145 free(uris);
1146 return ret;
1147 }
1148
1149 /*
1150 * Destroy session using name.
1151 * Returns size of returned session payload data or a negative error code.
1152 */
1153 int lttng_destroy_session(const char *session_name)
1154 {
1155 struct lttcomm_session_msg lsm;
1156
1157 if (session_name == NULL) {
1158 return -LTTNG_ERR_INVALID;
1159 }
1160
1161 memset(&lsm, 0, sizeof(lsm));
1162 lsm.cmd_type = LTTNG_DESTROY_SESSION;
1163
1164 lttng_ctl_copy_string(lsm.session.name, session_name,
1165 sizeof(lsm.session.name));
1166
1167 return lttng_ctl_ask_sessiond(&lsm, NULL);
1168 }
1169
1170 /*
1171 * Ask the session daemon for all available sessions.
1172 * Sets the contents of the sessions array.
1173 * Returns the number of lttng_session entries in sessions;
1174 * on error, returns a negative value.
1175 */
1176 int lttng_list_sessions(struct lttng_session **sessions)
1177 {
1178 int ret;
1179 struct lttcomm_session_msg lsm;
1180
1181 memset(&lsm, 0, sizeof(lsm));
1182 lsm.cmd_type = LTTNG_LIST_SESSIONS;
1183 ret = lttng_ctl_ask_sessiond(&lsm, (void**) sessions);
1184 if (ret < 0) {
1185 return ret;
1186 }
1187
1188 return ret / sizeof(struct lttng_session);
1189 }
1190
1191 /*
1192 * Ask the session daemon for all available domains of a session.
1193 * Sets the contents of the domains array.
1194 * Returns the number of lttng_domain entries in domains;
1195 * on error, returns a negative value.
1196 */
1197 int lttng_list_domains(const char *session_name,
1198 struct lttng_domain **domains)
1199 {
1200 int ret;
1201 struct lttcomm_session_msg lsm;
1202
1203 if (session_name == NULL) {
1204 return -LTTNG_ERR_INVALID;
1205 }
1206
1207 memset(&lsm, 0, sizeof(lsm));
1208 lsm.cmd_type = LTTNG_LIST_DOMAINS;
1209
1210 lttng_ctl_copy_string(lsm.session.name, session_name,
1211 sizeof(lsm.session.name));
1212
1213 ret = lttng_ctl_ask_sessiond(&lsm, (void**) domains);
1214 if (ret < 0) {
1215 return ret;
1216 }
1217
1218 return ret / sizeof(struct lttng_domain);
1219 }
1220
1221 /*
1222 * Ask the session daemon for all available channels of a session.
1223 * Sets the contents of the channels array.
1224 * Returns the number of lttng_channel entries in channels;
1225 * on error, returns a negative value.
1226 */
1227 int lttng_list_channels(struct lttng_handle *handle,
1228 struct lttng_channel **channels)
1229 {
1230 int ret;
1231 struct lttcomm_session_msg lsm;
1232
1233 if (handle == NULL) {
1234 return -LTTNG_ERR_INVALID;
1235 }
1236
1237 memset(&lsm, 0, sizeof(lsm));
1238 lsm.cmd_type = LTTNG_LIST_CHANNELS;
1239 lttng_ctl_copy_string(lsm.session.name, handle->session_name,
1240 sizeof(lsm.session.name));
1241
1242 lttng_ctl_copy_lttng_domain(&lsm.domain, &handle->domain);
1243
1244 ret = lttng_ctl_ask_sessiond(&lsm, (void**) channels);
1245 if (ret < 0) {
1246 return ret;
1247 }
1248
1249 return ret / sizeof(struct lttng_channel);
1250 }
1251
1252 /*
1253 * Ask the session daemon for all available events of a session channel.
1254 * Sets the contents of the events array.
1255 * Returns the number of lttng_event entries in events;
1256 * on error, returns a negative value.
1257 */
1258 int lttng_list_events(struct lttng_handle *handle,
1259 const char *channel_name, struct lttng_event **events)
1260 {
1261 int ret;
1262 struct lttcomm_session_msg lsm;
1263
1264 /* Safety check. An handle and channel name are mandatory */
1265 if (handle == NULL || channel_name == NULL) {
1266 return -LTTNG_ERR_INVALID;
1267 }
1268
1269 memset(&lsm, 0, sizeof(lsm));
1270 lsm.cmd_type = LTTNG_LIST_EVENTS;
1271 lttng_ctl_copy_string(lsm.session.name, handle->session_name,
1272 sizeof(lsm.session.name));
1273 lttng_ctl_copy_string(lsm.u.list.channel_name, channel_name,
1274 sizeof(lsm.u.list.channel_name));
1275
1276 lttng_ctl_copy_lttng_domain(&lsm.domain, &handle->domain);
1277
1278 ret = lttng_ctl_ask_sessiond(&lsm, (void**) events);
1279 if (ret < 0) {
1280 return ret;
1281 }
1282
1283 return ret / sizeof(struct lttng_event);
1284 }
1285
1286 /*
1287 * Sets the tracing_group variable with name.
1288 * This function allocates memory pointed to by tracing_group.
1289 * On success, returns 0, on error, returns -1 (null name) or -ENOMEM.
1290 */
1291 int lttng_set_tracing_group(const char *name)
1292 {
1293 if (name == NULL) {
1294 return -LTTNG_ERR_INVALID;
1295 }
1296
1297 if (asprintf(&tracing_group, "%s", name) < 0) {
1298 return -LTTNG_ERR_FATAL;
1299 }
1300
1301 return 0;
1302 }
1303
1304 /*
1305 * Returns size of returned session payload data or a negative error code.
1306 */
1307 int lttng_calibrate(struct lttng_handle *handle,
1308 struct lttng_calibrate *calibrate)
1309 {
1310 struct lttcomm_session_msg lsm;
1311
1312 /* Safety check. NULL pointer are forbidden */
1313 if (handle == NULL || calibrate == NULL) {
1314 return -LTTNG_ERR_INVALID;
1315 }
1316
1317 memset(&lsm, 0, sizeof(lsm));
1318 lsm.cmd_type = LTTNG_CALIBRATE;
1319 lttng_ctl_copy_lttng_domain(&lsm.domain, &handle->domain);
1320
1321 memcpy(&lsm.u.calibrate, calibrate, sizeof(lsm.u.calibrate));
1322
1323 return lttng_ctl_ask_sessiond(&lsm, NULL);
1324 }
1325
1326 /*
1327 * Set default channel attributes.
1328 * If either or both of the arguments are null, attr content is zeroe'd.
1329 */
1330 void lttng_channel_set_default_attr(struct lttng_domain *domain,
1331 struct lttng_channel_attr *attr)
1332 {
1333 /* Safety check */
1334 if (attr == NULL || domain == NULL) {
1335 return;
1336 }
1337
1338 memset(attr, 0, sizeof(struct lttng_channel_attr));
1339
1340 /* Same for all domains. */
1341 attr->overwrite = DEFAULT_CHANNEL_OVERWRITE;
1342 attr->tracefile_size = DEFAULT_CHANNEL_TRACEFILE_SIZE;
1343 attr->tracefile_count = DEFAULT_CHANNEL_TRACEFILE_COUNT;
1344
1345 switch (domain->type) {
1346 case LTTNG_DOMAIN_KERNEL:
1347 attr->switch_timer_interval = DEFAULT_KERNEL_CHANNEL_SWITCH_TIMER;
1348 attr->read_timer_interval = DEFAULT_KERNEL_CHANNEL_READ_TIMER;
1349 attr->subbuf_size = default_get_kernel_channel_subbuf_size();
1350 attr->num_subbuf = DEFAULT_KERNEL_CHANNEL_SUBBUF_NUM;
1351 attr->output = DEFAULT_KERNEL_CHANNEL_OUTPUT;
1352 break;
1353 case LTTNG_DOMAIN_UST:
1354 switch (domain->buf_type) {
1355 case LTTNG_BUFFER_PER_UID:
1356 attr->subbuf_size = default_get_ust_uid_channel_subbuf_size();
1357 attr->num_subbuf = DEFAULT_UST_UID_CHANNEL_SUBBUF_NUM;
1358 attr->output = DEFAULT_UST_UID_CHANNEL_OUTPUT;
1359 attr->switch_timer_interval = DEFAULT_UST_UID_CHANNEL_SWITCH_TIMER;
1360 attr->read_timer_interval = DEFAULT_UST_UID_CHANNEL_READ_TIMER;
1361 break;
1362 case LTTNG_BUFFER_PER_PID:
1363 default:
1364 attr->subbuf_size = default_get_ust_pid_channel_subbuf_size();
1365 attr->num_subbuf = DEFAULT_UST_PID_CHANNEL_SUBBUF_NUM;
1366 attr->output = DEFAULT_UST_PID_CHANNEL_OUTPUT;
1367 attr->switch_timer_interval = DEFAULT_UST_PID_CHANNEL_SWITCH_TIMER;
1368 attr->read_timer_interval = DEFAULT_UST_PID_CHANNEL_READ_TIMER;
1369 break;
1370 }
1371 default:
1372 /* Default behavior: leave set to 0. */
1373 break;
1374 }
1375 }
1376
1377 /*
1378 * Check if session daemon is alive.
1379 *
1380 * Return 1 if alive or 0 if not.
1381 * On error returns a negative value.
1382 */
1383 int lttng_session_daemon_alive(void)
1384 {
1385 int ret;
1386
1387 ret = set_session_daemon_path();
1388 if (ret < 0) {
1389 /* Error */
1390 return ret;
1391 }
1392
1393 if (*sessiond_sock_path == '\0') {
1394 /*
1395 * No socket path set. Weird error which means the constructor was not
1396 * called.
1397 */
1398 assert(0);
1399 }
1400
1401 ret = try_connect_sessiond(sessiond_sock_path);
1402 if (ret < 0) {
1403 /* Not alive */
1404 return 0;
1405 }
1406
1407 /* Is alive */
1408 return 1;
1409 }
1410
1411 /*
1412 * Set URL for a consumer for a session and domain.
1413 *
1414 * Return 0 on success, else a negative value.
1415 */
1416 int lttng_set_consumer_url(struct lttng_handle *handle,
1417 const char *control_url, const char *data_url)
1418 {
1419 int ret;
1420 ssize_t size;
1421 struct lttcomm_session_msg lsm;
1422 struct lttng_uri *uris = NULL;
1423
1424 if (handle == NULL || (control_url == NULL && data_url == NULL)) {
1425 return -LTTNG_ERR_INVALID;
1426 }
1427
1428 memset(&lsm, 0, sizeof(lsm));
1429
1430 lsm.cmd_type = LTTNG_SET_CONSUMER_URI;
1431
1432 lttng_ctl_copy_string(lsm.session.name, handle->session_name,
1433 sizeof(lsm.session.name));
1434 lttng_ctl_copy_lttng_domain(&lsm.domain, &handle->domain);
1435
1436 size = uri_parse_str_urls(control_url, data_url, &uris);
1437 if (size < 0) {
1438 return -LTTNG_ERR_INVALID;
1439 }
1440
1441 lsm.u.uri.size = size;
1442
1443 ret = lttng_ctl_ask_sessiond_varlen(&lsm, uris,
1444 sizeof(struct lttng_uri) * size, NULL);
1445
1446 free(uris);
1447 return ret;
1448 }
1449
1450 /*
1451 * [OBSOLETE]
1452 */
1453 int lttng_enable_consumer(struct lttng_handle *handle)
1454 {
1455 return -ENOSYS;
1456 }
1457
1458 /*
1459 * [OBSOLETE]
1460 */
1461 int lttng_disable_consumer(struct lttng_handle *handle)
1462 {
1463 return -ENOSYS;
1464 }
1465
1466 /*
1467 * This is an extension of create session that is ONLY and SHOULD only be used
1468 * by the lttng command line program. It exists to avoid using URI parsing in
1469 * the lttng client.
1470 *
1471 * We need the date and time for the trace path subdirectory for the case where
1472 * the user does NOT define one using either -o or -U. Using the normal
1473 * lttng_create_session API call, we have no clue on the session daemon side if
1474 * the URL was generated automatically by the client or define by the user.
1475 *
1476 * So this function "wrapper" is hidden from the public API, takes the datetime
1477 * string and appends it if necessary to the URI subdirectory before sending it
1478 * to the session daemon.
1479 *
1480 * With this extra function, the lttng_create_session call behavior is not
1481 * changed and the timestamp is appended to the URI on the session daemon side
1482 * if necessary.
1483 */
1484 int _lttng_create_session_ext(const char *name, const char *url,
1485 const char *datetime)
1486 {
1487 int ret;
1488 ssize_t size;
1489 struct lttcomm_session_msg lsm;
1490 struct lttng_uri *uris = NULL;
1491
1492 if (name == NULL || datetime == NULL) {
1493 return -LTTNG_ERR_INVALID;
1494 }
1495
1496 memset(&lsm, 0, sizeof(lsm));
1497
1498 lsm.cmd_type = LTTNG_CREATE_SESSION;
1499 lttng_ctl_copy_string(lsm.session.name, name, sizeof(lsm.session.name));
1500
1501 /* There should never be a data URL */
1502 size = uri_parse_str_urls(url, NULL, &uris);
1503 if (size < 0) {
1504 ret = -LTTNG_ERR_INVALID;
1505 goto error;
1506 }
1507
1508 lsm.u.uri.size = size;
1509
1510 if (size > 0 && uris[0].dtype != LTTNG_DST_PATH && strlen(uris[0].subdir) == 0) {
1511 /* Don't append datetime if the name was automatically created. */
1512 if (strncmp(name, DEFAULT_SESSION_NAME "-",
1513 strlen(DEFAULT_SESSION_NAME) + 1)) {
1514 ret = snprintf(uris[0].subdir, sizeof(uris[0].subdir), "%s-%s",
1515 name, datetime);
1516 } else {
1517 ret = snprintf(uris[0].subdir, sizeof(uris[0].subdir), "%s", name);
1518 }
1519 if (ret < 0) {
1520 PERROR("snprintf uri subdir");
1521 ret = -LTTNG_ERR_FATAL;
1522 goto error;
1523 }
1524 }
1525
1526 ret = lttng_ctl_ask_sessiond_varlen(&lsm, uris,
1527 sizeof(struct lttng_uri) * size, NULL);
1528
1529 error:
1530 free(uris);
1531 return ret;
1532 }
1533
1534 /*
1535 * For a given session name, this call checks if the data is ready to be read
1536 * or is still being extracted by the consumer(s) hence not ready to be used by
1537 * any readers.
1538 */
1539 int lttng_data_pending(const char *session_name)
1540 {
1541 int ret;
1542 struct lttcomm_session_msg lsm;
1543
1544 if (session_name == NULL) {
1545 return -LTTNG_ERR_INVALID;
1546 }
1547
1548 memset(&lsm, 0, sizeof(lsm));
1549 lsm.cmd_type = LTTNG_DATA_PENDING;
1550
1551 lttng_ctl_copy_string(lsm.session.name, session_name,
1552 sizeof(lsm.session.name));
1553
1554 ret = lttng_ctl_ask_sessiond(&lsm, NULL);
1555
1556 /*
1557 * The lttng_ctl_ask_sessiond function negate the return code if it's not
1558 * LTTNG_OK so getting -1 means that the reply ret_code was 1 thus meaning
1559 * that the data is available. Yes it is hackish but for now this is the
1560 * only way.
1561 */
1562 if (ret == -1) {
1563 ret = 1;
1564 }
1565
1566 return ret;
1567 }
1568
1569 /*
1570 * Create a session exclusively used for snapshot.
1571 *
1572 * Returns LTTNG_OK on success or a negative error code.
1573 */
1574 int lttng_create_session_snapshot(const char *name, const char *snapshot_url)
1575 {
1576 int ret;
1577 ssize_t size;
1578 struct lttcomm_session_msg lsm;
1579 struct lttng_uri *uris = NULL;
1580
1581 if (name == NULL) {
1582 return -LTTNG_ERR_INVALID;
1583 }
1584
1585 memset(&lsm, 0, sizeof(lsm));
1586
1587 lsm.cmd_type = LTTNG_CREATE_SESSION_SNAPSHOT;
1588 lttng_ctl_copy_string(lsm.session.name, name, sizeof(lsm.session.name));
1589
1590 size = uri_parse_str_urls(snapshot_url, NULL, &uris);
1591 if (size < 0) {
1592 return -LTTNG_ERR_INVALID;
1593 }
1594
1595 lsm.u.uri.size = size;
1596
1597 ret = lttng_ctl_ask_sessiond_varlen(&lsm, uris,
1598 sizeof(struct lttng_uri) * size, NULL);
1599
1600 free(uris);
1601 return ret;
1602 }
1603
1604 /*
1605 * Create a session exclusively used for live.
1606 *
1607 * Returns LTTNG_OK on success or a negative error code.
1608 */
1609 int lttng_create_session_live(const char *name, const char *url,
1610 unsigned int timer_interval)
1611 {
1612 int ret;
1613 ssize_t size;
1614 struct lttcomm_session_msg lsm;
1615 struct lttng_uri *uris = NULL;
1616
1617 if (name == NULL) {
1618 return -LTTNG_ERR_INVALID;
1619 }
1620
1621 memset(&lsm, 0, sizeof(lsm));
1622
1623 lsm.cmd_type = LTTNG_CREATE_SESSION_LIVE;
1624 lttng_ctl_copy_string(lsm.session.name, name, sizeof(lsm.session.name));
1625
1626 if (url) {
1627 size = uri_parse_str_urls(url, NULL, &uris);
1628 if (size <= 0) {
1629 ret = -LTTNG_ERR_INVALID;
1630 goto end;
1631 }
1632
1633 /* file:// is not accepted for live session. */
1634 if (uris[0].dtype == LTTNG_DST_PATH) {
1635 ret = -LTTNG_ERR_INVALID;
1636 goto end;
1637 }
1638 } else {
1639 size = 0;
1640 }
1641
1642 lsm.u.session_live.nb_uri = size;
1643 lsm.u.session_live.timer_interval = timer_interval;
1644
1645 ret = lttng_ctl_ask_sessiond_varlen(&lsm, uris,
1646 sizeof(struct lttng_uri) * size, NULL);
1647
1648 end:
1649 free(uris);
1650 return ret;
1651 }
1652
1653 /*
1654 * lib constructor
1655 */
1656 static void __attribute__((constructor)) init()
1657 {
1658 /* Set default session group */
1659 lttng_set_tracing_group(DEFAULT_TRACING_GROUP);
1660 }
1661
1662 /*
1663 * lib destructor
1664 */
1665 static void __attribute__((destructor)) lttng_ctl_exit()
1666 {
1667 free(tracing_group);
1668 }
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