Collate lttng_enable_event* code
[lttng-tools.git] / src / lib / lttng-ctl / lttng-ctl.c
... / ...
CommitLineData
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
46static const int print_xml = 1;
47#define dbg_printf(fmt, args...) \
48 printf("[debug liblttng-ctl] " fmt, ## args)
49#else
50static const int print_xml = 0;
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
60/* Socket to session daemon for communication */
61static int sessiond_socket;
62static char sessiond_sock_path[PATH_MAX];
63
64/* Variables */
65static char *tracing_group;
66static 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 */
75int lttng_opt_quiet;
76int lttng_opt_verbose;
77
78/*
79 * Copy string from src to dst and enforce null terminated byte.
80 */
81LTTNG_HIDDEN
82void 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 */
98LTTNG_HIDDEN
99void 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 */
122static 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
139end:
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 */
149static 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
168end:
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 */
178static 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
192end:
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 */
201LTTNG_HIDDEN
202int 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
243free_list:
244 free(grp_list);
245
246end:
247 return ret;
248}
249
250/*
251 * Try connect to session daemon with sock_path.
252 *
253 * Return 0 on success, else -1
254 */
255static 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
279error:
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 */
290static 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 }
330end:
331 return 0;
332
333error:
334 return -1;
335}
336
337/*
338 * Connect to the LTTng session daemon.
339 *
340 * On success, return 0. On error, return -1.
341 */
342static 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
367error:
368 return -1;
369}
370
371/*
372 * Clean disconnect from the session daemon.
373 * On success, return 0. On error, return -1.
374 */
375static 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 */
394LTTNG_HIDDEN
395int 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
467end:
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 */
476struct 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
498end:
499 return handle;
500}
501
502/*
503 * Destroy handle by free(3) the pointer.
504 */
505void 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 */
514int 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 lsm.cmd_type = LTTNG_REGISTER_CONSUMER;
524 lttng_ctl_copy_string(lsm.session.name, handle->session_name,
525 sizeof(lsm.session.name));
526 lttng_ctl_copy_lttng_domain(&lsm.domain, &handle->domain);
527
528 lttng_ctl_copy_string(lsm.u.reg.path, socket_path, sizeof(lsm.u.reg.path));
529
530 return lttng_ctl_ask_sessiond(&lsm, NULL);
531}
532
533/*
534 * Start tracing for all traces of the session.
535 * Returns size of returned session payload data or a negative error code.
536 */
537int lttng_start_tracing(const char *session_name)
538{
539 struct lttcomm_session_msg lsm;
540
541 if (session_name == NULL) {
542 return -LTTNG_ERR_INVALID;
543 }
544
545 lsm.cmd_type = LTTNG_START_TRACE;
546
547 lttng_ctl_copy_string(lsm.session.name, session_name,
548 sizeof(lsm.session.name));
549
550 return lttng_ctl_ask_sessiond(&lsm, NULL);
551}
552
553/*
554 * Stop tracing for all traces of the session.
555 */
556static int _lttng_stop_tracing(const char *session_name, int wait)
557{
558 int ret, data_ret;
559 struct lttcomm_session_msg lsm;
560
561 if (session_name == NULL) {
562 return -LTTNG_ERR_INVALID;
563 }
564
565 lsm.cmd_type = LTTNG_STOP_TRACE;
566
567 lttng_ctl_copy_string(lsm.session.name, session_name,
568 sizeof(lsm.session.name));
569
570 ret = lttng_ctl_ask_sessiond(&lsm, NULL);
571 if (ret < 0 && ret != -LTTNG_ERR_TRACE_ALREADY_STOPPED) {
572 goto error;
573 }
574
575 if (!wait) {
576 goto end;
577 }
578
579 _MSG("Waiting for data availability");
580 fflush(stdout);
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 _MSG(".");
598 fflush(stdout);
599 }
600 } while (data_ret != 0);
601
602 MSG("");
603
604end:
605error:
606 return ret;
607}
608
609/*
610 * Stop tracing and wait for data availability.
611 */
612int lttng_stop_tracing(const char *session_name)
613{
614 return _lttng_stop_tracing(session_name, 1);
615}
616
617/*
618 * Stop tracing but _don't_ wait for data availability.
619 */
620int lttng_stop_tracing_no_wait(const char *session_name)
621{
622 return _lttng_stop_tracing(session_name, 0);
623}
624
625/*
626 * Add context to a channel.
627 *
628 * If the given channel is NULL, add the contexts to all channels.
629 * The event_name param is ignored.
630 *
631 * Returns the size of the returned payload data or a negative error code.
632 */
633int lttng_add_context(struct lttng_handle *handle,
634 struct lttng_event_context *ctx, const char *event_name,
635 const char *channel_name)
636{
637 struct lttcomm_session_msg lsm;
638
639 /* Safety check. Both are mandatory */
640 if (handle == NULL || ctx == NULL) {
641 return -LTTNG_ERR_INVALID;
642 }
643
644 memset(&lsm, 0, sizeof(lsm));
645
646 lsm.cmd_type = LTTNG_ADD_CONTEXT;
647
648 /* If no channel name, send empty string. */
649 if (channel_name == NULL) {
650 lttng_ctl_copy_string(lsm.u.context.channel_name, "",
651 sizeof(lsm.u.context.channel_name));
652 } else {
653 lttng_ctl_copy_string(lsm.u.context.channel_name, channel_name,
654 sizeof(lsm.u.context.channel_name));
655 }
656
657 lttng_ctl_copy_lttng_domain(&lsm.domain, &handle->domain);
658
659 memcpy(&lsm.u.context.ctx, ctx, sizeof(struct lttng_event_context));
660
661 lttng_ctl_copy_string(lsm.session.name, handle->session_name,
662 sizeof(lsm.session.name));
663
664 return lttng_ctl_ask_sessiond(&lsm, NULL);
665}
666
667/*
668 * Enable event(s) for a channel.
669 * If no event name is specified, all events are enabled.
670 * If no channel name is specified, the default 'channel0' is used.
671 * Returns size of returned session payload data or a negative error code.
672 */
673int lttng_enable_event(struct lttng_handle *handle,
674 struct lttng_event *ev, const char *channel_name)
675{
676 return lttng_enable_event_with_exclusions(handle, ev, channel_name,
677 NULL, 0, NULL);
678}
679
680/*
681 * Create or enable an event with a filter expression.
682 *
683 * Return negative error value on error.
684 * Return size of returned session payload data if OK.
685 */
686int lttng_enable_event_with_filter(struct lttng_handle *handle,
687 struct lttng_event *event, const char *channel_name,
688 const char *filter_expression)
689{
690 return lttng_enable_event_with_exclusions(handle, event, channel_name,
691 filter_expression, 0, NULL);
692}
693
694/*
695 * Enable event(s) for a channel, possibly with exclusions and a filter.
696 * If no event name is specified, all events are enabled.
697 * If no channel name is specified, the default name is used.
698 * If filter expression is not NULL, the filter is set for the event.
699 * If exclusion count is not zero, the exclusions are set for the event.
700 * Returns size of returned session payload data or a negative error code.
701 */
702int lttng_enable_event_with_exclusions(struct lttng_handle *handle,
703 struct lttng_event *ev, const char *channel_name,
704 const char *filter_expression,
705 int exclusion_count, char **exclusion_list)
706{
707 struct lttcomm_session_msg lsm;
708 char *varlen_data;
709 int ret = 0;
710 struct filter_parser_ctx *ctx = NULL;
711 FILE *fmem = NULL;
712
713 if (handle == NULL || ev == NULL) {
714 return -LTTNG_ERR_INVALID;
715 }
716
717 /* Empty filter string will always be rejected by the parser
718 * anyway, so treat this corner-case early to eliminate
719 * lttng_fmemopen error for 0-byte allocation.
720 */
721 if (filter_expression && filter_expression[0] == '\0') {
722 return -LTTNG_ERR_INVALID;
723 }
724
725 memset(&lsm, 0, sizeof(lsm));
726
727 /* If no channel name, send empty string. */
728 if (channel_name == NULL) {
729 lttng_ctl_copy_string(lsm.u.enable.channel_name, "",
730 sizeof(lsm.u.enable.channel_name));
731 } else {
732 lttng_ctl_copy_string(lsm.u.enable.channel_name, channel_name,
733 sizeof(lsm.u.enable.channel_name));
734 }
735
736 lttng_ctl_copy_lttng_domain(&lsm.domain, &handle->domain);
737
738 /* figure out correct command type, based on if we have a filter or exclusions */
739 if (exclusion_count == 0) {
740 if (filter_expression == NULL) {
741 if (ev->name[0] != '\0') {
742 lsm.cmd_type = LTTNG_ENABLE_EVENT;
743 } else {
744 lsm.cmd_type = LTTNG_ENABLE_ALL_EVENT;
745 }
746 } else {
747 lsm.cmd_type = LTTNG_ENABLE_EVENT_WITH_FILTER;
748 }
749 } else {
750 lsm.cmd_type = LTTNG_ENABLE_EVENT_WITH_EXCLUSION;
751 }
752
753 memcpy(&lsm.u.enable.event, ev, sizeof(lsm.u.enable.event));
754
755 lttng_ctl_copy_string(lsm.session.name, handle->session_name,
756 sizeof(lsm.session.name));
757 lsm.u.enable.exclusion_count = exclusion_count;
758 lsm.u.enable.bytecode_len = 0;
759
760 if (exclusion_count == 0 && filter_expression == NULL) {
761 ret = lttng_ctl_ask_sessiond(&lsm, NULL);
762 return ret;
763 }
764
765 /*
766 * We have either a filter or some exclusions, so we need to set up
767 * a variable-length memory block from where to send the data
768 */
769
770 /* Parse filter expression */
771 if (filter_expression != NULL) {
772
773 /*
774 * casting const to non-const, as the underlying function will
775 * use it in read-only mode.
776 */
777 fmem = lttng_fmemopen((void *) filter_expression,
778 strlen(filter_expression), "r");
779 if (!fmem) {
780 fprintf(stderr, "Error opening memory as stream\n");
781 return -LTTNG_ERR_FILTER_NOMEM;
782 }
783 ctx = filter_parser_ctx_alloc(fmem);
784 if (!ctx) {
785 fprintf(stderr, "Error allocating parser\n");
786 ret = -LTTNG_ERR_FILTER_NOMEM;
787 goto filter_alloc_error;
788 }
789 ret = filter_parser_ctx_append_ast(ctx);
790 if (ret) {
791 fprintf(stderr, "Parse error\n");
792 ret = -LTTNG_ERR_FILTER_INVAL;
793 goto parse_error;
794 }
795 ret = filter_visitor_set_parent(ctx);
796 if (ret) {
797 fprintf(stderr, "Set parent error\n");
798 ret = -LTTNG_ERR_FILTER_INVAL;
799 goto parse_error;
800 }
801 if (print_xml) {
802 ret = filter_visitor_print_xml(ctx, stdout, 0);
803 if (ret) {
804 fflush(stdout);
805 fprintf(stderr, "XML print error\n");
806 ret = -LTTNG_ERR_FILTER_INVAL;
807 goto parse_error;
808 }
809 }
810
811 dbg_printf("Generating IR... ");
812 fflush(stdout);
813 ret = filter_visitor_ir_generate(ctx);
814 if (ret) {
815 fprintf(stderr, "Generate IR error\n");
816 ret = -LTTNG_ERR_FILTER_INVAL;
817 goto parse_error;
818 }
819 dbg_printf("done\n");
820
821 dbg_printf("Validating IR... ");
822 fflush(stdout);
823 ret = filter_visitor_ir_check_binary_op_nesting(ctx);
824 if (ret) {
825 ret = -LTTNG_ERR_FILTER_INVAL;
826 goto parse_error;
827 }
828 dbg_printf("done\n");
829
830 dbg_printf("Generating bytecode... ");
831 fflush(stdout);
832 ret = filter_visitor_bytecode_generate(ctx);
833 if (ret) {
834 fprintf(stderr, "Generate bytecode error\n");
835 ret = -LTTNG_ERR_FILTER_INVAL;
836 goto parse_error;
837 }
838 dbg_printf("done\n");
839 dbg_printf("Size of bytecode generated: %u bytes.\n",
840 bytecode_get_len(&ctx->bytecode->b));
841
842 lsm.u.enable.bytecode_len = sizeof(ctx->bytecode->b)
843 + bytecode_get_len(&ctx->bytecode->b);
844 }
845
846 /* Allocate variable length data */
847 if (lsm.u.enable.exclusion_count != 0) {
848 varlen_data = zmalloc(lsm.u.enable.bytecode_len
849 + LTTNG_SYMBOL_NAME_LEN * exclusion_count);
850 if (!varlen_data) {
851 ret = -LTTNG_ERR_EXCLUSION_NOMEM;
852 goto varlen_alloc_error;
853 }
854 /* Put exclusion names first in the data */
855 while (exclusion_count--) {
856 strncpy(varlen_data + LTTNG_SYMBOL_NAME_LEN * exclusion_count,
857 *(exclusion_list + exclusion_count),
858 LTTNG_SYMBOL_NAME_LEN);
859 }
860 /* Add filter bytecode next */
861 if (lsm.u.enable.bytecode_len != 0) {
862 memcpy(varlen_data + LTTNG_SYMBOL_NAME_LEN * lsm.u.enable.exclusion_count,
863 &ctx->bytecode->b,
864 lsm.u.enable.bytecode_len);
865 }
866 } else {
867 /* no exclusions - use the already allocated filter bytecode */
868 varlen_data = (char *)(&ctx->bytecode->b);
869 }
870
871 ret = lttng_ctl_ask_sessiond_varlen(&lsm, varlen_data,
872 LTTNG_SYMBOL_NAME_LEN * lsm.u.enable.exclusion_count
873 + lsm.u.enable.bytecode_len,
874 NULL);
875
876 if (lsm.u.enable.exclusion_count != 0) {
877 free(varlen_data);
878 }
879
880varlen_alloc_error:
881 if (filter_expression) {
882 filter_bytecode_free(ctx);
883 filter_ir_free(ctx);
884 filter_parser_ctx_free(ctx);
885 if (fclose(fmem) != 0) {
886 perror("fclose");
887 }
888 }
889 return ret;
890
891parse_error:
892 filter_bytecode_free(ctx);
893 filter_ir_free(ctx);
894 filter_parser_ctx_free(ctx);
895filter_alloc_error:
896 if (fclose(fmem) != 0) {
897 perror("fclose");
898 }
899 return ret;
900}
901
902/*
903 * Disable event(s) of a channel and domain.
904 * If no event name is specified, all events are disabled.
905 * If no channel name is specified, the default 'channel0' is used.
906 * Returns size of returned session payload data or a negative error code.
907 */
908int lttng_disable_event(struct lttng_handle *handle, const char *name,
909 const char *channel_name)
910{
911 struct lttcomm_session_msg lsm;
912
913 if (handle == NULL) {
914 return -LTTNG_ERR_INVALID;
915 }
916
917 memset(&lsm, 0, sizeof(lsm));
918
919 /* If no channel name, send empty string. */
920 if (channel_name == NULL) {
921 lttng_ctl_copy_string(lsm.u.disable.channel_name, "",
922 sizeof(lsm.u.disable.channel_name));
923 } else {
924 lttng_ctl_copy_string(lsm.u.disable.channel_name, channel_name,
925 sizeof(lsm.u.disable.channel_name));
926 }
927
928 lttng_ctl_copy_lttng_domain(&lsm.domain, &handle->domain);
929
930 if (name != NULL) {
931 lttng_ctl_copy_string(lsm.u.disable.name, name,
932 sizeof(lsm.u.disable.name));
933 lsm.cmd_type = LTTNG_DISABLE_EVENT;
934 } else {
935 lsm.cmd_type = LTTNG_DISABLE_ALL_EVENT;
936 }
937
938 lttng_ctl_copy_string(lsm.session.name, handle->session_name,
939 sizeof(lsm.session.name));
940
941 return lttng_ctl_ask_sessiond(&lsm, NULL);
942}
943
944/*
945 * Enable channel per domain
946 * Returns size of returned session payload data or a negative error code.
947 */
948int lttng_enable_channel(struct lttng_handle *handle,
949 struct lttng_channel *chan)
950{
951 struct lttcomm_session_msg lsm;
952
953 /*
954 * NULL arguments are forbidden. No default values.
955 */
956 if (handle == NULL || chan == NULL) {
957 return -LTTNG_ERR_INVALID;
958 }
959
960 memset(&lsm, 0, sizeof(lsm));
961
962 memcpy(&lsm.u.channel.chan, chan, sizeof(lsm.u.channel.chan));
963
964 lsm.cmd_type = LTTNG_ENABLE_CHANNEL;
965
966 lttng_ctl_copy_lttng_domain(&lsm.domain, &handle->domain);
967
968 lttng_ctl_copy_string(lsm.session.name, handle->session_name,
969 sizeof(lsm.session.name));
970
971 return lttng_ctl_ask_sessiond(&lsm, NULL);
972}
973
974/*
975 * All tracing will be stopped for registered events of the channel.
976 * Returns size of returned session payload data or a negative error code.
977 */
978int lttng_disable_channel(struct lttng_handle *handle, const char *name)
979{
980 struct lttcomm_session_msg lsm;
981
982 /* Safety check. Both are mandatory */
983 if (handle == NULL || name == NULL) {
984 return -LTTNG_ERR_INVALID;
985 }
986
987 memset(&lsm, 0, sizeof(lsm));
988
989 lsm.cmd_type = LTTNG_DISABLE_CHANNEL;
990
991 lttng_ctl_copy_string(lsm.u.disable.channel_name, name,
992 sizeof(lsm.u.disable.channel_name));
993
994 lttng_ctl_copy_lttng_domain(&lsm.domain, &handle->domain);
995
996 lttng_ctl_copy_string(lsm.session.name, handle->session_name,
997 sizeof(lsm.session.name));
998
999 return lttng_ctl_ask_sessiond(&lsm, NULL);
1000}
1001
1002/*
1003 * Lists all available tracepoints of domain.
1004 * Sets the contents of the events array.
1005 * Returns the number of lttng_event entries in events;
1006 * on error, returns a negative value.
1007 */
1008int lttng_list_tracepoints(struct lttng_handle *handle,
1009 struct lttng_event **events)
1010{
1011 int ret;
1012 struct lttcomm_session_msg lsm;
1013
1014 if (handle == NULL) {
1015 return -LTTNG_ERR_INVALID;
1016 }
1017
1018 lsm.cmd_type = LTTNG_LIST_TRACEPOINTS;
1019 lttng_ctl_copy_lttng_domain(&lsm.domain, &handle->domain);
1020
1021 ret = lttng_ctl_ask_sessiond(&lsm, (void **) events);
1022 if (ret < 0) {
1023 return ret;
1024 }
1025
1026 return ret / sizeof(struct lttng_event);
1027}
1028
1029/*
1030 * Lists all available tracepoint fields of domain.
1031 * Sets the contents of the event field array.
1032 * Returns the number of lttng_event_field entries in events;
1033 * on error, returns a negative value.
1034 */
1035int lttng_list_tracepoint_fields(struct lttng_handle *handle,
1036 struct lttng_event_field **fields)
1037{
1038 int ret;
1039 struct lttcomm_session_msg lsm;
1040
1041 if (handle == NULL) {
1042 return -LTTNG_ERR_INVALID;
1043 }
1044
1045 lsm.cmd_type = LTTNG_LIST_TRACEPOINT_FIELDS;
1046 lttng_ctl_copy_lttng_domain(&lsm.domain, &handle->domain);
1047
1048 ret = lttng_ctl_ask_sessiond(&lsm, (void **) fields);
1049 if (ret < 0) {
1050 return ret;
1051 }
1052
1053 return ret / sizeof(struct lttng_event_field);
1054}
1055
1056/*
1057 * Returns a human readable string describing
1058 * the error code (a negative value).
1059 */
1060const char *lttng_strerror(int code)
1061{
1062 return error_get_str(code);
1063}
1064
1065/*
1066 * Create a brand new session using name and url for destination.
1067 *
1068 * Returns LTTNG_OK on success or a negative error code.
1069 */
1070int lttng_create_session(const char *name, const char *url)
1071{
1072 int ret;
1073 ssize_t size;
1074 struct lttcomm_session_msg lsm;
1075 struct lttng_uri *uris = NULL;
1076
1077 if (name == NULL) {
1078 return -LTTNG_ERR_INVALID;
1079 }
1080
1081 memset(&lsm, 0, sizeof(lsm));
1082
1083 lsm.cmd_type = LTTNG_CREATE_SESSION;
1084 lttng_ctl_copy_string(lsm.session.name, name, sizeof(lsm.session.name));
1085
1086 /* There should never be a data URL */
1087 size = uri_parse_str_urls(url, NULL, &uris);
1088 if (size < 0) {
1089 return -LTTNG_ERR_INVALID;
1090 }
1091
1092 lsm.u.uri.size = size;
1093
1094 ret = lttng_ctl_ask_sessiond_varlen(&lsm, uris,
1095 sizeof(struct lttng_uri) * size, NULL);
1096
1097 free(uris);
1098 return ret;
1099}
1100
1101/*
1102 * Destroy session using name.
1103 * Returns size of returned session payload data or a negative error code.
1104 */
1105int lttng_destroy_session(const char *session_name)
1106{
1107 struct lttcomm_session_msg lsm;
1108
1109 if (session_name == NULL) {
1110 return -LTTNG_ERR_INVALID;
1111 }
1112
1113 lsm.cmd_type = LTTNG_DESTROY_SESSION;
1114
1115 lttng_ctl_copy_string(lsm.session.name, session_name,
1116 sizeof(lsm.session.name));
1117
1118 return lttng_ctl_ask_sessiond(&lsm, NULL);
1119}
1120
1121/*
1122 * Ask the session daemon for all available sessions.
1123 * Sets the contents of the sessions array.
1124 * Returns the number of lttng_session entries in sessions;
1125 * on error, returns a negative value.
1126 */
1127int lttng_list_sessions(struct lttng_session **sessions)
1128{
1129 int ret;
1130 struct lttcomm_session_msg lsm;
1131
1132 lsm.cmd_type = LTTNG_LIST_SESSIONS;
1133 ret = lttng_ctl_ask_sessiond(&lsm, (void**) sessions);
1134 if (ret < 0) {
1135 return ret;
1136 }
1137
1138 return ret / sizeof(struct lttng_session);
1139}
1140
1141/*
1142 * Ask the session daemon for all available domains of a session.
1143 * Sets the contents of the domains array.
1144 * Returns the number of lttng_domain entries in domains;
1145 * on error, returns a negative value.
1146 */
1147int lttng_list_domains(const char *session_name,
1148 struct lttng_domain **domains)
1149{
1150 int ret;
1151 struct lttcomm_session_msg lsm;
1152
1153 if (session_name == NULL) {
1154 return -LTTNG_ERR_INVALID;
1155 }
1156
1157 lsm.cmd_type = LTTNG_LIST_DOMAINS;
1158
1159 lttng_ctl_copy_string(lsm.session.name, session_name,
1160 sizeof(lsm.session.name));
1161
1162 ret = lttng_ctl_ask_sessiond(&lsm, (void**) domains);
1163 if (ret < 0) {
1164 return ret;
1165 }
1166
1167 return ret / sizeof(struct lttng_domain);
1168}
1169
1170/*
1171 * Ask the session daemon for all available channels of a session.
1172 * Sets the contents of the channels array.
1173 * Returns the number of lttng_channel entries in channels;
1174 * on error, returns a negative value.
1175 */
1176int lttng_list_channels(struct lttng_handle *handle,
1177 struct lttng_channel **channels)
1178{
1179 int ret;
1180 struct lttcomm_session_msg lsm;
1181
1182 if (handle == NULL) {
1183 return -LTTNG_ERR_INVALID;
1184 }
1185
1186 lsm.cmd_type = LTTNG_LIST_CHANNELS;
1187 lttng_ctl_copy_string(lsm.session.name, handle->session_name,
1188 sizeof(lsm.session.name));
1189
1190 lttng_ctl_copy_lttng_domain(&lsm.domain, &handle->domain);
1191
1192 ret = lttng_ctl_ask_sessiond(&lsm, (void**) channels);
1193 if (ret < 0) {
1194 return ret;
1195 }
1196
1197 return ret / sizeof(struct lttng_channel);
1198}
1199
1200/*
1201 * Ask the session daemon for all available events of a session channel.
1202 * Sets the contents of the events array.
1203 * Returns the number of lttng_event entries in events;
1204 * on error, returns a negative value.
1205 */
1206int lttng_list_events(struct lttng_handle *handle,
1207 const char *channel_name, struct lttng_event **events)
1208{
1209 int ret;
1210 struct lttcomm_session_msg lsm;
1211
1212 /* Safety check. An handle and channel name are mandatory */
1213 if (handle == NULL || channel_name == NULL) {
1214 return -LTTNG_ERR_INVALID;
1215 }
1216
1217 lsm.cmd_type = LTTNG_LIST_EVENTS;
1218 lttng_ctl_copy_string(lsm.session.name, handle->session_name,
1219 sizeof(lsm.session.name));
1220 lttng_ctl_copy_string(lsm.u.list.channel_name, channel_name,
1221 sizeof(lsm.u.list.channel_name));
1222
1223 lttng_ctl_copy_lttng_domain(&lsm.domain, &handle->domain);
1224
1225 ret = lttng_ctl_ask_sessiond(&lsm, (void**) events);
1226 if (ret < 0) {
1227 return ret;
1228 }
1229
1230 return ret / sizeof(struct lttng_event);
1231}
1232
1233/*
1234 * Sets the tracing_group variable with name.
1235 * This function allocates memory pointed to by tracing_group.
1236 * On success, returns 0, on error, returns -1 (null name) or -ENOMEM.
1237 */
1238int lttng_set_tracing_group(const char *name)
1239{
1240 if (name == NULL) {
1241 return -LTTNG_ERR_INVALID;
1242 }
1243
1244 if (asprintf(&tracing_group, "%s", name) < 0) {
1245 return -LTTNG_ERR_FATAL;
1246 }
1247
1248 return 0;
1249}
1250
1251/*
1252 * Returns size of returned session payload data or a negative error code.
1253 */
1254int lttng_calibrate(struct lttng_handle *handle,
1255 struct lttng_calibrate *calibrate)
1256{
1257 struct lttcomm_session_msg lsm;
1258
1259 /* Safety check. NULL pointer are forbidden */
1260 if (handle == NULL || calibrate == NULL) {
1261 return -LTTNG_ERR_INVALID;
1262 }
1263
1264 lsm.cmd_type = LTTNG_CALIBRATE;
1265 lttng_ctl_copy_lttng_domain(&lsm.domain, &handle->domain);
1266
1267 memcpy(&lsm.u.calibrate, calibrate, sizeof(lsm.u.calibrate));
1268
1269 return lttng_ctl_ask_sessiond(&lsm, NULL);
1270}
1271
1272/*
1273 * Set default channel attributes.
1274 * If either or both of the arguments are null, attr content is zeroe'd.
1275 */
1276void lttng_channel_set_default_attr(struct lttng_domain *domain,
1277 struct lttng_channel_attr *attr)
1278{
1279 /* Safety check */
1280 if (attr == NULL || domain == NULL) {
1281 return;
1282 }
1283
1284 memset(attr, 0, sizeof(struct lttng_channel_attr));
1285
1286 /* Same for all domains. */
1287 attr->overwrite = DEFAULT_CHANNEL_OVERWRITE;
1288 attr->tracefile_size = DEFAULT_CHANNEL_TRACEFILE_SIZE;
1289 attr->tracefile_count = DEFAULT_CHANNEL_TRACEFILE_COUNT;
1290
1291 switch (domain->type) {
1292 case LTTNG_DOMAIN_KERNEL:
1293 attr->switch_timer_interval = DEFAULT_KERNEL_CHANNEL_SWITCH_TIMER;
1294 attr->read_timer_interval = DEFAULT_KERNEL_CHANNEL_READ_TIMER;
1295 attr->subbuf_size = default_get_kernel_channel_subbuf_size();
1296 attr->num_subbuf = DEFAULT_KERNEL_CHANNEL_SUBBUF_NUM;
1297 attr->output = DEFAULT_KERNEL_CHANNEL_OUTPUT;
1298 break;
1299 case LTTNG_DOMAIN_UST:
1300 switch (domain->buf_type) {
1301 case LTTNG_BUFFER_PER_UID:
1302 attr->subbuf_size = default_get_ust_uid_channel_subbuf_size();
1303 attr->num_subbuf = DEFAULT_UST_UID_CHANNEL_SUBBUF_NUM;
1304 attr->output = DEFAULT_UST_UID_CHANNEL_OUTPUT;
1305 attr->switch_timer_interval = DEFAULT_UST_UID_CHANNEL_SWITCH_TIMER;
1306 attr->read_timer_interval = DEFAULT_UST_UID_CHANNEL_READ_TIMER;
1307 break;
1308 case LTTNG_BUFFER_PER_PID:
1309 default:
1310 attr->subbuf_size = default_get_ust_pid_channel_subbuf_size();
1311 attr->num_subbuf = DEFAULT_UST_PID_CHANNEL_SUBBUF_NUM;
1312 attr->output = DEFAULT_UST_PID_CHANNEL_OUTPUT;
1313 attr->switch_timer_interval = DEFAULT_UST_PID_CHANNEL_SWITCH_TIMER;
1314 attr->read_timer_interval = DEFAULT_UST_PID_CHANNEL_READ_TIMER;
1315 break;
1316 }
1317 default:
1318 /* Default behavior: leave set to 0. */
1319 break;
1320 }
1321}
1322
1323/*
1324 * Check if session daemon is alive.
1325 *
1326 * Return 1 if alive or 0 if not.
1327 * On error returns a negative value.
1328 */
1329int lttng_session_daemon_alive(void)
1330{
1331 int ret;
1332
1333 ret = set_session_daemon_path();
1334 if (ret < 0) {
1335 /* Error */
1336 return ret;
1337 }
1338
1339 if (*sessiond_sock_path == '\0') {
1340 /*
1341 * No socket path set. Weird error which means the constructor was not
1342 * called.
1343 */
1344 assert(0);
1345 }
1346
1347 ret = try_connect_sessiond(sessiond_sock_path);
1348 if (ret < 0) {
1349 /* Not alive */
1350 return 0;
1351 }
1352
1353 /* Is alive */
1354 return 1;
1355}
1356
1357/*
1358 * Set URL for a consumer for a session and domain.
1359 *
1360 * Return 0 on success, else a negative value.
1361 */
1362int lttng_set_consumer_url(struct lttng_handle *handle,
1363 const char *control_url, const char *data_url)
1364{
1365 int ret;
1366 ssize_t size;
1367 struct lttcomm_session_msg lsm;
1368 struct lttng_uri *uris = NULL;
1369
1370 if (handle == NULL || (control_url == NULL && data_url == NULL)) {
1371 return -LTTNG_ERR_INVALID;
1372 }
1373
1374 memset(&lsm, 0, sizeof(lsm));
1375
1376 lsm.cmd_type = LTTNG_SET_CONSUMER_URI;
1377
1378 lttng_ctl_copy_string(lsm.session.name, handle->session_name,
1379 sizeof(lsm.session.name));
1380 lttng_ctl_copy_lttng_domain(&lsm.domain, &handle->domain);
1381
1382 size = uri_parse_str_urls(control_url, data_url, &uris);
1383 if (size < 0) {
1384 return -LTTNG_ERR_INVALID;
1385 }
1386
1387 lsm.u.uri.size = size;
1388
1389 ret = lttng_ctl_ask_sessiond_varlen(&lsm, uris,
1390 sizeof(struct lttng_uri) * size, NULL);
1391
1392 free(uris);
1393 return ret;
1394}
1395
1396/*
1397 * [OBSOLETE]
1398 */
1399int lttng_enable_consumer(struct lttng_handle *handle)
1400{
1401 return -ENOSYS;
1402}
1403
1404/*
1405 * [OBSOLETE]
1406 */
1407int lttng_disable_consumer(struct lttng_handle *handle)
1408{
1409 return -ENOSYS;
1410}
1411
1412/*
1413 * This is an extension of create session that is ONLY and SHOULD only be used
1414 * by the lttng command line program. It exists to avoid using URI parsing in
1415 * the lttng client.
1416 *
1417 * We need the date and time for the trace path subdirectory for the case where
1418 * the user does NOT define one using either -o or -U. Using the normal
1419 * lttng_create_session API call, we have no clue on the session daemon side if
1420 * the URL was generated automatically by the client or define by the user.
1421 *
1422 * So this function "wrapper" is hidden from the public API, takes the datetime
1423 * string and appends it if necessary to the URI subdirectory before sending it
1424 * to the session daemon.
1425 *
1426 * With this extra function, the lttng_create_session call behavior is not
1427 * changed and the timestamp is appended to the URI on the session daemon side
1428 * if necessary.
1429 */
1430int _lttng_create_session_ext(const char *name, const char *url,
1431 const char *datetime)
1432{
1433 int ret;
1434 ssize_t size;
1435 struct lttcomm_session_msg lsm;
1436 struct lttng_uri *uris = NULL;
1437
1438 if (name == NULL || datetime == NULL) {
1439 return -LTTNG_ERR_INVALID;
1440 }
1441
1442 memset(&lsm, 0, sizeof(lsm));
1443
1444 lsm.cmd_type = LTTNG_CREATE_SESSION;
1445 lttng_ctl_copy_string(lsm.session.name, name, sizeof(lsm.session.name));
1446
1447 /* There should never be a data URL */
1448 size = uri_parse_str_urls(url, NULL, &uris);
1449 if (size < 0) {
1450 ret = -LTTNG_ERR_INVALID;
1451 goto error;
1452 }
1453
1454 lsm.u.uri.size = size;
1455
1456 if (size > 0 && uris[0].dtype != LTTNG_DST_PATH && strlen(uris[0].subdir) == 0) {
1457 /* Don't append datetime if the name was automatically created. */
1458 if (strncmp(name, DEFAULT_SESSION_NAME "-",
1459 strlen(DEFAULT_SESSION_NAME) + 1)) {
1460 ret = snprintf(uris[0].subdir, sizeof(uris[0].subdir), "%s-%s",
1461 name, datetime);
1462 } else {
1463 ret = snprintf(uris[0].subdir, sizeof(uris[0].subdir), "%s", name);
1464 }
1465 if (ret < 0) {
1466 PERROR("snprintf uri subdir");
1467 ret = -LTTNG_ERR_FATAL;
1468 goto error;
1469 }
1470 }
1471
1472 ret = lttng_ctl_ask_sessiond_varlen(&lsm, uris,
1473 sizeof(struct lttng_uri) * size, NULL);
1474
1475error:
1476 free(uris);
1477 return ret;
1478}
1479
1480/*
1481 * For a given session name, this call checks if the data is ready to be read
1482 * or is still being extracted by the consumer(s) hence not ready to be used by
1483 * any readers.
1484 */
1485int lttng_data_pending(const char *session_name)
1486{
1487 int ret;
1488 struct lttcomm_session_msg lsm;
1489
1490 if (session_name == NULL) {
1491 return -LTTNG_ERR_INVALID;
1492 }
1493
1494 lsm.cmd_type = LTTNG_DATA_PENDING;
1495
1496 lttng_ctl_copy_string(lsm.session.name, session_name,
1497 sizeof(lsm.session.name));
1498
1499 ret = lttng_ctl_ask_sessiond(&lsm, NULL);
1500
1501 /*
1502 * The lttng_ctl_ask_sessiond function negate the return code if it's not
1503 * LTTNG_OK so getting -1 means that the reply ret_code was 1 thus meaning
1504 * that the data is available. Yes it is hackish but for now this is the
1505 * only way.
1506 */
1507 if (ret == -1) {
1508 ret = 1;
1509 }
1510
1511 return ret;
1512}
1513
1514/*
1515 * Create a session exclusively used for snapshot.
1516 *
1517 * Returns LTTNG_OK on success or a negative error code.
1518 */
1519int lttng_create_session_snapshot(const char *name, const char *snapshot_url)
1520{
1521 int ret;
1522 ssize_t size;
1523 struct lttcomm_session_msg lsm;
1524 struct lttng_uri *uris = NULL;
1525
1526 if (name == NULL) {
1527 return -LTTNG_ERR_INVALID;
1528 }
1529
1530 memset(&lsm, 0, sizeof(lsm));
1531
1532 lsm.cmd_type = LTTNG_CREATE_SESSION_SNAPSHOT;
1533 lttng_ctl_copy_string(lsm.session.name, name, sizeof(lsm.session.name));
1534
1535 size = uri_parse_str_urls(snapshot_url, NULL, &uris);
1536 if (size < 0) {
1537 return -LTTNG_ERR_INVALID;
1538 }
1539
1540 lsm.u.uri.size = size;
1541
1542 ret = lttng_ctl_ask_sessiond_varlen(&lsm, uris,
1543 sizeof(struct lttng_uri) * size, NULL);
1544
1545 free(uris);
1546 return ret;
1547}
1548
1549/*
1550 * Create a session exclusively used for live.
1551 *
1552 * Returns LTTNG_OK on success or a negative error code.
1553 */
1554int lttng_create_session_live(const char *name, const char *url,
1555 unsigned int timer_interval)
1556{
1557 int ret;
1558 ssize_t size;
1559 struct lttcomm_session_msg lsm;
1560 struct lttng_uri *uris = NULL;
1561
1562 if (name == NULL) {
1563 return -LTTNG_ERR_INVALID;
1564 }
1565
1566 memset(&lsm, 0, sizeof(lsm));
1567
1568 lsm.cmd_type = LTTNG_CREATE_SESSION_LIVE;
1569 lttng_ctl_copy_string(lsm.session.name, name, sizeof(lsm.session.name));
1570
1571 size = uri_parse_str_urls(url, NULL, &uris);
1572 if (size < 0) {
1573 ret = -LTTNG_ERR_INVALID;
1574 goto end;
1575 }
1576
1577 /* file:// is not accepted for live session. */
1578 if (uris[0].dtype == LTTNG_DST_PATH) {
1579 ret = -LTTNG_ERR_INVALID;
1580 goto end;
1581 }
1582
1583 lsm.u.session_live.nb_uri = size;
1584 lsm.u.session_live.timer_interval = timer_interval;
1585
1586 ret = lttng_ctl_ask_sessiond_varlen(&lsm, uris,
1587 sizeof(struct lttng_uri) * size, NULL);
1588
1589end:
1590 free(uris);
1591 return ret;
1592}
1593
1594/*
1595 * lib constructor
1596 */
1597static void __attribute__((constructor)) init()
1598{
1599 /* Set default session group */
1600 lttng_set_tracing_group(DEFAULT_TRACING_GROUP);
1601}
1602
1603/*
1604 * lib destructor
1605 */
1606static void __attribute__((destructor)) lttng_ctl_exit()
1607{
1608 free(tracing_group);
1609}
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