4 * Linux Trace Toolkit Control Library
6 * Copyright (C) 2011 David Goulet <david.goulet@polymtl.ca>
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.
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.
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
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>
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"
46 static const int print_xml
= 1;
47 #define dbg_printf(fmt, args...) \
48 printf("[debug liblttng-ctl] " fmt, ## args)
50 static const int print_xml
= 0;
51 #define dbg_printf(fmt, args...) \
53 /* do nothing but check printf format */ \
55 printf("[debug liblttnctl] " fmt, ## args); \
60 /* Socket to session daemon for communication */
61 static int sessiond_socket
;
62 static char sessiond_sock_path
[PATH_MAX
];
65 static char *tracing_group
;
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.
76 int lttng_opt_verbose
;
79 * Copy string from src to dst and enforce null terminated byte.
82 void lttng_ctl_copy_string(char *dst
, const char *src
, size_t len
)
85 strncpy(dst
, src
, len
);
86 /* Enforce the NULL terminated byte */
94 * Copy domain to lttcomm_session_msg domain.
96 * If domain is unknown, default domain will be the kernel.
99 void lttng_ctl_copy_lttng_domain(struct lttng_domain
*dst
,
100 struct lttng_domain
*src
)
104 case LTTNG_DOMAIN_KERNEL
:
105 case LTTNG_DOMAIN_UST
:
106 case LTTNG_DOMAIN_JUL
:
107 memcpy(dst
, src
, sizeof(struct lttng_domain
));
110 memset(dst
, 0, sizeof(struct lttng_domain
));
117 * Send lttcomm_session_msg to the session daemon.
119 * On success, returns the number of bytes sent (>=0)
120 * On error, returns -1
122 static int send_session_msg(struct lttcomm_session_msg
*lsm
)
127 ret
= -LTTNG_ERR_NO_SESSIOND
;
131 DBG("LSM cmd type : %d", lsm
->cmd_type
);
133 ret
= lttcomm_send_creds_unix_sock(sessiond_socket
, lsm
,
134 sizeof(struct lttcomm_session_msg
));
136 ret
= -LTTNG_ERR_FATAL
;
144 * Send var len data to the session daemon.
146 * On success, returns the number of bytes sent (>=0)
147 * On error, returns -1
149 static int send_session_varlen(void *data
, size_t len
)
154 ret
= -LTTNG_ERR_NO_SESSIOND
;
163 ret
= lttcomm_send_unix_sock(sessiond_socket
, data
, len
);
165 ret
= -LTTNG_ERR_FATAL
;
173 * Receive data from the sessiond socket.
175 * On success, returns the number of bytes received (>=0)
176 * On error, returns -1 (recvmsg() error) or -ENOTCONN
178 static int recv_data_sessiond(void *buf
, size_t len
)
183 ret
= -LTTNG_ERR_NO_SESSIOND
;
187 ret
= lttcomm_recv_unix_sock(sessiond_socket
, buf
, len
);
189 ret
= -LTTNG_ERR_FATAL
;
197 * Check if we are in the specified group.
199 * If yes return 1, else return -1.
202 int lttng_check_tracing_group(void)
204 struct group
*grp_tracing
; /* no free(). See getgrnam(3) */
206 int grp_list_size
, grp_id
, i
;
208 const char *grp_name
= tracing_group
;
210 /* Get GID of group 'tracing' */
211 grp_tracing
= getgrnam(grp_name
);
213 /* If grp_tracing is NULL, the group does not exist. */
217 /* Get number of supplementary group IDs */
218 grp_list_size
= getgroups(0, NULL
);
219 if (grp_list_size
< 0) {
224 /* Alloc group list of the right size */
225 grp_list
= malloc(grp_list_size
* sizeof(gid_t
));
230 grp_id
= getgroups(grp_list_size
, grp_list
);
236 for (i
= 0; i
< grp_list_size
; i
++) {
237 if (grp_list
[i
] == grp_tracing
->gr_gid
) {
251 * Try connect to session daemon with sock_path.
253 * Return 0 on success, else -1
255 static int try_connect_sessiond(const char *sock_path
)
259 /* If socket exist, we check if the daemon listens for connect. */
260 ret
= access(sock_path
, F_OK
);
266 ret
= lttcomm_connect_unix_sock(sock_path
);
272 ret
= lttcomm_close_unix_sock(ret
);
274 perror("lttcomm_close_unix_sock");
284 * Set sessiond socket path by putting it in the global sessiond_sock_path
287 * Returns 0 on success, negative value on failure (the sessiond socket path
288 * is somehow too long or ENOMEM).
290 static int set_session_daemon_path(void)
292 int in_tgroup
= 0; /* In tracing group */
298 /* Are we in the tracing group ? */
299 in_tgroup
= lttng_check_tracing_group();
302 if ((uid
== 0) || in_tgroup
) {
303 lttng_ctl_copy_string(sessiond_sock_path
,
304 DEFAULT_GLOBAL_CLIENT_UNIX_SOCK
, sizeof(sessiond_sock_path
));
312 ret
= try_connect_sessiond(sessiond_sock_path
);
316 /* Global session daemon not available... */
318 /* ...or not in tracing group (and not root), default */
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)
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
))) {
338 * Connect to the LTTng session daemon.
340 * On success, return 0. On error, return -1.
342 static int connect_sessiond(void)
346 /* Don't try to connect if already connected. */
351 ret
= set_session_daemon_path();
356 /* Connect to the sesssion daemon */
357 ret
= lttcomm_connect_unix_sock(sessiond_sock_path
);
362 sessiond_socket
= ret
;
372 * Clean disconnect from the session daemon.
373 * On success, return 0. On error, return -1.
375 static int disconnect_sessiond(void)
380 ret
= lttcomm_close_unix_sock(sessiond_socket
);
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.
392 * Return size of data (only payload, not header) or a negative error code.
395 int lttng_ctl_ask_sessiond_varlen(struct lttcomm_session_msg
*lsm
,
396 void *vardata
, size_t varlen
, void **buf
)
401 struct lttcomm_lttng_msg llm
;
403 ret
= connect_sessiond();
405 ret
= -LTTNG_ERR_NO_SESSIOND
;
409 /* Send command to session daemon */
410 ret
= send_session_msg(lsm
);
412 /* Ret value is a valid lttng error code. */
415 /* Send var len data */
416 ret
= send_session_varlen(vardata
, varlen
);
418 /* Ret value is a valid lttng error code. */
422 /* Get header from data transmission */
423 ret
= recv_data_sessiond(&llm
, sizeof(llm
));
425 /* Ret value is a valid lttng error code. */
429 /* Check error code if OK */
430 if (llm
.ret_code
!= LTTNG_OK
) {
435 size
= llm
.data_size
;
437 /* If client free with size 0 */
445 data
= (void*) malloc(size
);
447 /* Get payload data */
448 ret
= recv_data_sessiond(data
, size
);
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.
459 ret
= -LTTNG_ERR_INVALID
;
468 disconnect_sessiond();
473 * Create lttng handle and return pointer.
474 * The returned pointer will be NULL in case of malloc() error.
476 struct lttng_handle
*lttng_create_handle(const char *session_name
,
477 struct lttng_domain
*domain
)
479 struct lttng_handle
*handle
= NULL
;
481 if (domain
== NULL
) {
485 handle
= malloc(sizeof(struct lttng_handle
));
486 if (handle
== NULL
) {
487 PERROR("malloc handle");
491 /* Copy session name */
492 lttng_ctl_copy_string(handle
->session_name
, session_name
,
493 sizeof(handle
->session_name
));
495 /* Copy lttng domain */
496 lttng_ctl_copy_lttng_domain(&handle
->domain
, domain
);
503 * Destroy handle by free(3) the pointer.
505 void lttng_destroy_handle(struct lttng_handle
*handle
)
511 * Register an outside consumer.
512 * Returns size of returned session payload data or a negative error code.
514 int lttng_register_consumer(struct lttng_handle
*handle
,
515 const char *socket_path
)
517 struct lttcomm_session_msg lsm
;
519 if (handle
== NULL
|| socket_path
== NULL
) {
520 return -LTTNG_ERR_INVALID
;
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
);
529 lttng_ctl_copy_string(lsm
.u
.reg
.path
, socket_path
, sizeof(lsm
.u
.reg
.path
));
531 return lttng_ctl_ask_sessiond(&lsm
, NULL
);
535 * Start tracing for all traces of the session.
536 * Returns size of returned session payload data or a negative error code.
538 int lttng_start_tracing(const char *session_name
)
540 struct lttcomm_session_msg lsm
;
542 if (session_name
== NULL
) {
543 return -LTTNG_ERR_INVALID
;
546 memset(&lsm
, 0, sizeof(lsm
));
547 lsm
.cmd_type
= LTTNG_START_TRACE
;
549 lttng_ctl_copy_string(lsm
.session
.name
, session_name
,
550 sizeof(lsm
.session
.name
));
552 return lttng_ctl_ask_sessiond(&lsm
, NULL
);
556 * Stop tracing for all traces of the session.
558 static int _lttng_stop_tracing(const char *session_name
, int wait
)
561 struct lttcomm_session_msg lsm
;
563 if (session_name
== NULL
) {
564 return -LTTNG_ERR_INVALID
;
567 memset(&lsm
, 0, sizeof(lsm
));
568 lsm
.cmd_type
= LTTNG_STOP_TRACE
;
570 lttng_ctl_copy_string(lsm
.session
.name
, session_name
,
571 sizeof(lsm
.session
.name
));
573 ret
= lttng_ctl_ask_sessiond(&lsm
, NULL
);
574 if (ret
< 0 && ret
!= -LTTNG_ERR_TRACE_ALREADY_STOPPED
) {
582 _MSG("Waiting for data availability");
585 /* Check for data availability */
587 data_ret
= lttng_data_pending(session_name
);
589 /* Return the data available call error. */
595 * Data sleep time before retrying (in usec). Don't sleep if the call
596 * returned value indicates availability.
599 usleep(DEFAULT_DATA_AVAILABILITY_WAIT_TIME
);
603 } while (data_ret
!= 0);
613 * Stop tracing and wait for data availability.
615 int lttng_stop_tracing(const char *session_name
)
617 return _lttng_stop_tracing(session_name
, 1);
621 * Stop tracing but _don't_ wait for data availability.
623 int lttng_stop_tracing_no_wait(const char *session_name
)
625 return _lttng_stop_tracing(session_name
, 0);
629 * Add context to a channel.
631 * If the given channel is NULL, add the contexts to all channels.
632 * The event_name param is ignored.
634 * Returns the size of the returned payload data or a negative error code.
636 int lttng_add_context(struct lttng_handle
*handle
,
637 struct lttng_event_context
*ctx
, const char *event_name
,
638 const char *channel_name
)
640 struct lttcomm_session_msg lsm
;
642 /* Safety check. Both are mandatory */
643 if (handle
== NULL
|| ctx
== NULL
) {
644 return -LTTNG_ERR_INVALID
;
647 memset(&lsm
, 0, sizeof(lsm
));
649 lsm
.cmd_type
= LTTNG_ADD_CONTEXT
;
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
));
656 lttng_ctl_copy_string(lsm
.u
.context
.channel_name
, channel_name
,
657 sizeof(lsm
.u
.context
.channel_name
));
660 lttng_ctl_copy_lttng_domain(&lsm
.domain
, &handle
->domain
);
662 memcpy(&lsm
.u
.context
.ctx
, ctx
, sizeof(struct lttng_event_context
));
664 lttng_ctl_copy_string(lsm
.session
.name
, handle
->session_name
,
665 sizeof(lsm
.session
.name
));
667 return lttng_ctl_ask_sessiond(&lsm
, NULL
);
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.
676 int lttng_enable_event(struct lttng_handle
*handle
,
677 struct lttng_event
*ev
, const char *channel_name
)
679 return lttng_enable_event_with_exclusions(handle
, ev
, channel_name
,
684 * Create or enable an event with a filter expression.
686 * Return negative error value on error.
687 * Return size of returned session payload data if OK.
689 int lttng_enable_event_with_filter(struct lttng_handle
*handle
,
690 struct lttng_event
*event
, const char *channel_name
,
691 const char *filter_expression
)
693 return lttng_enable_event_with_exclusions(handle
, event
, channel_name
,
694 filter_expression
, 0, NULL
);
698 * Enable event(s) for a channel, possibly with exclusions and a filter.
699 * If no event name is specified, all events are enabled.
700 * If no channel name is specified, the default name is used.
701 * If filter expression is not NULL, the filter is set for the event.
702 * If exclusion count is not zero, the exclusions are set for the event.
703 * Returns size of returned session payload data or a negative error code.
705 int lttng_enable_event_with_exclusions(struct lttng_handle
*handle
,
706 struct lttng_event
*ev
, const char *channel_name
,
707 const char *filter_expression
,
708 int exclusion_count
, char **exclusion_list
)
710 struct lttcomm_session_msg lsm
;
711 char *varlen_data
, *jul_filter
= NULL
;
713 struct filter_parser_ctx
*ctx
= NULL
;
716 if (handle
== NULL
|| ev
== NULL
) {
717 return -LTTNG_ERR_INVALID
;
720 /* Empty filter string will always be rejected by the parser
721 * anyway, so treat this corner-case early to eliminate
722 * lttng_fmemopen error for 0-byte allocation.
724 if (filter_expression
&& filter_expression
[0] == '\0') {
725 return -LTTNG_ERR_INVALID
;
728 memset(&lsm
, 0, sizeof(lsm
));
730 /* If no channel name, send empty string. */
731 if (channel_name
== NULL
) {
732 lttng_ctl_copy_string(lsm
.u
.enable
.channel_name
, "",
733 sizeof(lsm
.u
.enable
.channel_name
));
735 lttng_ctl_copy_string(lsm
.u
.enable
.channel_name
, channel_name
,
736 sizeof(lsm
.u
.enable
.channel_name
));
739 if (ev
->name
[0] != '\0') {
740 lsm
.cmd_type
= LTTNG_ENABLE_EVENT
;
742 lsm
.cmd_type
= LTTNG_ENABLE_ALL_EVENT
;
745 lttng_ctl_copy_lttng_domain(&lsm
.domain
, &handle
->domain
);
746 memcpy(&lsm
.u
.enable
.event
, ev
, sizeof(lsm
.u
.enable
.event
));
748 lttng_ctl_copy_string(lsm
.session
.name
, handle
->session_name
,
749 sizeof(lsm
.session
.name
));
750 lsm
.u
.enable
.exclusion_count
= exclusion_count
;
751 lsm
.u
.enable
.bytecode_len
= 0;
754 * For the JUL domain, a filter is enforced except for the enable all
755 * event. This is done to avoid having the event in all sessions thus
756 * filtering by logger name.
758 if (exclusion_count
== 0 && filter_expression
== NULL
&&
759 handle
->domain
.type
!= LTTNG_DOMAIN_JUL
) {
764 * We have either a filter or some exclusions, so we need to set up
765 * a variable-length memory block from where to send the data
768 /* Parse filter expression */
769 if (filter_expression
!= NULL
|| handle
->domain
.type
== LTTNG_DOMAIN_JUL
) {
770 if (handle
->domain
.type
== LTTNG_DOMAIN_JUL
) {
773 if (ev
->name
[0] != '*') {
774 if (filter_expression
) {
775 err
= asprintf(&jul_filter
, "%s && logger_name == \"%s\"",
776 filter_expression
, ev
->name
);
778 err
= asprintf(&jul_filter
, "logger_name == \"%s\"",
783 return -LTTNG_ERR_NOMEM
;
785 filter_expression
= jul_filter
;
788 /* Add loglevel filtering if any for the JUL domain. */
789 if (ev
->loglevel_type
!= LTTNG_EVENT_LOGLEVEL_ALL
) {
792 if (ev
->loglevel_type
== LTTNG_EVENT_LOGLEVEL_RANGE
) {
798 if (filter_expression
) {
799 err
= asprintf(&jul_filter
, "%s && int_loglevel %s %d",
800 filter_expression
, op
, ev
->loglevel
);
802 err
= asprintf(&jul_filter
, "int_loglevel %s %d", op
,
807 return -LTTNG_ERR_NOMEM
;
809 filter_expression
= jul_filter
;
812 if (!filter_expression
) {
818 * casting const to non-const, as the underlying function will
819 * use it in read-only mode.
821 fmem
= lttng_fmemopen((void *) filter_expression
,
822 strlen(filter_expression
), "r");
824 fprintf(stderr
, "Error opening memory as stream\n");
826 return -LTTNG_ERR_FILTER_NOMEM
;
828 ctx
= filter_parser_ctx_alloc(fmem
);
830 fprintf(stderr
, "Error allocating parser\n");
831 ret
= -LTTNG_ERR_FILTER_NOMEM
;
832 goto filter_alloc_error
;
834 ret
= filter_parser_ctx_append_ast(ctx
);
836 fprintf(stderr
, "Parse error\n");
837 ret
= -LTTNG_ERR_FILTER_INVAL
;
840 ret
= filter_visitor_set_parent(ctx
);
842 fprintf(stderr
, "Set parent error\n");
843 ret
= -LTTNG_ERR_FILTER_INVAL
;
847 ret
= filter_visitor_print_xml(ctx
, stdout
, 0);
850 fprintf(stderr
, "XML print error\n");
851 ret
= -LTTNG_ERR_FILTER_INVAL
;
856 dbg_printf("Generating IR... ");
858 ret
= filter_visitor_ir_generate(ctx
);
860 fprintf(stderr
, "Generate IR error\n");
861 ret
= -LTTNG_ERR_FILTER_INVAL
;
864 dbg_printf("done\n");
866 dbg_printf("Validating IR... ");
868 ret
= filter_visitor_ir_check_binary_op_nesting(ctx
);
870 ret
= -LTTNG_ERR_FILTER_INVAL
;
873 dbg_printf("done\n");
875 dbg_printf("Generating bytecode... ");
877 ret
= filter_visitor_bytecode_generate(ctx
);
879 fprintf(stderr
, "Generate bytecode error\n");
880 ret
= -LTTNG_ERR_FILTER_INVAL
;
883 dbg_printf("done\n");
884 dbg_printf("Size of bytecode generated: %u bytes.\n",
885 bytecode_get_len(&ctx
->bytecode
->b
));
887 lsm
.u
.enable
.bytecode_len
= sizeof(ctx
->bytecode
->b
)
888 + bytecode_get_len(&ctx
->bytecode
->b
);
891 /* Allocate variable length data */
892 if (lsm
.u
.enable
.exclusion_count
!= 0) {
893 varlen_data
= zmalloc(lsm
.u
.enable
.bytecode_len
894 + LTTNG_SYMBOL_NAME_LEN
* exclusion_count
);
896 ret
= -LTTNG_ERR_EXCLUSION_NOMEM
;
897 goto varlen_alloc_error
;
899 /* Put exclusion names first in the data */
900 while (exclusion_count
--) {
901 strncpy(varlen_data
+ LTTNG_SYMBOL_NAME_LEN
* exclusion_count
,
902 *(exclusion_list
+ exclusion_count
),
903 LTTNG_SYMBOL_NAME_LEN
);
905 /* Add filter bytecode next */
906 if (lsm
.u
.enable
.bytecode_len
!= 0) {
907 memcpy(varlen_data
+ LTTNG_SYMBOL_NAME_LEN
* lsm
.u
.enable
.exclusion_count
,
909 lsm
.u
.enable
.bytecode_len
);
912 /* no exclusions - use the already allocated filter bytecode */
913 varlen_data
= (char *)(&ctx
->bytecode
->b
);
916 ret
= lttng_ctl_ask_sessiond_varlen(&lsm
, varlen_data
,
917 (LTTNG_SYMBOL_NAME_LEN
* lsm
.u
.enable
.exclusion_count
) +
918 lsm
.u
.enable
.bytecode_len
, NULL
);
920 if (lsm
.u
.enable
.exclusion_count
!= 0) {
925 if (filter_expression
) {
926 filter_bytecode_free(ctx
);
928 filter_parser_ctx_free(ctx
);
929 if (fclose(fmem
) != 0) {
937 filter_bytecode_free(ctx
);
939 filter_parser_ctx_free(ctx
);
941 if (fclose(fmem
) != 0) {
948 ret
= lttng_ctl_ask_sessiond(&lsm
, NULL
);
953 * Disable event(s) of a channel and domain.
954 * If no event name is specified, all events are disabled.
955 * If no channel name is specified, the default 'channel0' is used.
956 * Returns size of returned session payload data or a negative error code.
958 int lttng_disable_event(struct lttng_handle
*handle
, const char *name
,
959 const char *channel_name
)
961 struct lttcomm_session_msg lsm
;
963 if (handle
== NULL
) {
964 return -LTTNG_ERR_INVALID
;
967 memset(&lsm
, 0, sizeof(lsm
));
969 /* If no channel name, send empty string. */
970 if (channel_name
== NULL
) {
971 lttng_ctl_copy_string(lsm
.u
.disable
.channel_name
, "",
972 sizeof(lsm
.u
.disable
.channel_name
));
974 lttng_ctl_copy_string(lsm
.u
.disable
.channel_name
, channel_name
,
975 sizeof(lsm
.u
.disable
.channel_name
));
978 lttng_ctl_copy_lttng_domain(&lsm
.domain
, &handle
->domain
);
981 lttng_ctl_copy_string(lsm
.u
.disable
.name
, name
,
982 sizeof(lsm
.u
.disable
.name
));
983 lsm
.cmd_type
= LTTNG_DISABLE_EVENT
;
985 lsm
.cmd_type
= LTTNG_DISABLE_ALL_EVENT
;
988 lttng_ctl_copy_string(lsm
.session
.name
, handle
->session_name
,
989 sizeof(lsm
.session
.name
));
991 return lttng_ctl_ask_sessiond(&lsm
, NULL
);
995 * Enable channel per domain
996 * Returns size of returned session payload data or a negative error code.
998 int lttng_enable_channel(struct lttng_handle
*handle
,
999 struct lttng_channel
*chan
)
1001 struct lttcomm_session_msg lsm
;
1004 * NULL arguments are forbidden. No default values.
1006 if (handle
== NULL
|| chan
== NULL
) {
1007 return -LTTNG_ERR_INVALID
;
1010 memset(&lsm
, 0, sizeof(lsm
));
1012 memcpy(&lsm
.u
.channel
.chan
, chan
, sizeof(lsm
.u
.channel
.chan
));
1014 lsm
.cmd_type
= LTTNG_ENABLE_CHANNEL
;
1016 lttng_ctl_copy_lttng_domain(&lsm
.domain
, &handle
->domain
);
1018 lttng_ctl_copy_string(lsm
.session
.name
, handle
->session_name
,
1019 sizeof(lsm
.session
.name
));
1021 return lttng_ctl_ask_sessiond(&lsm
, NULL
);
1025 * All tracing will be stopped for registered events of the channel.
1026 * Returns size of returned session payload data or a negative error code.
1028 int lttng_disable_channel(struct lttng_handle
*handle
, const char *name
)
1030 struct lttcomm_session_msg lsm
;
1032 /* Safety check. Both are mandatory */
1033 if (handle
== NULL
|| name
== NULL
) {
1034 return -LTTNG_ERR_INVALID
;
1037 memset(&lsm
, 0, sizeof(lsm
));
1039 lsm
.cmd_type
= LTTNG_DISABLE_CHANNEL
;
1041 lttng_ctl_copy_string(lsm
.u
.disable
.channel_name
, name
,
1042 sizeof(lsm
.u
.disable
.channel_name
));
1044 lttng_ctl_copy_lttng_domain(&lsm
.domain
, &handle
->domain
);
1046 lttng_ctl_copy_string(lsm
.session
.name
, handle
->session_name
,
1047 sizeof(lsm
.session
.name
));
1049 return lttng_ctl_ask_sessiond(&lsm
, NULL
);
1053 * Lists all available tracepoints of domain.
1054 * Sets the contents of the events array.
1055 * Returns the number of lttng_event entries in events;
1056 * on error, returns a negative value.
1058 int lttng_list_tracepoints(struct lttng_handle
*handle
,
1059 struct lttng_event
**events
)
1062 struct lttcomm_session_msg lsm
;
1064 if (handle
== NULL
) {
1065 return -LTTNG_ERR_INVALID
;
1068 memset(&lsm
, 0, sizeof(lsm
));
1069 lsm
.cmd_type
= LTTNG_LIST_TRACEPOINTS
;
1070 lttng_ctl_copy_lttng_domain(&lsm
.domain
, &handle
->domain
);
1072 ret
= lttng_ctl_ask_sessiond(&lsm
, (void **) events
);
1077 return ret
/ sizeof(struct lttng_event
);
1081 * Lists all available tracepoint fields of domain.
1082 * Sets the contents of the event field array.
1083 * Returns the number of lttng_event_field entries in events;
1084 * on error, returns a negative value.
1086 int lttng_list_tracepoint_fields(struct lttng_handle
*handle
,
1087 struct lttng_event_field
**fields
)
1090 struct lttcomm_session_msg lsm
;
1092 if (handle
== NULL
) {
1093 return -LTTNG_ERR_INVALID
;
1096 memset(&lsm
, 0, sizeof(lsm
));
1097 lsm
.cmd_type
= LTTNG_LIST_TRACEPOINT_FIELDS
;
1098 lttng_ctl_copy_lttng_domain(&lsm
.domain
, &handle
->domain
);
1100 ret
= lttng_ctl_ask_sessiond(&lsm
, (void **) fields
);
1105 return ret
/ sizeof(struct lttng_event_field
);
1109 * Returns a human readable string describing
1110 * the error code (a negative value).
1112 const char *lttng_strerror(int code
)
1114 return error_get_str(code
);
1118 * Create a brand new session using name and url for destination.
1120 * Returns LTTNG_OK on success or a negative error code.
1122 int lttng_create_session(const char *name
, const char *url
)
1126 struct lttcomm_session_msg lsm
;
1127 struct lttng_uri
*uris
= NULL
;
1130 return -LTTNG_ERR_INVALID
;
1133 memset(&lsm
, 0, sizeof(lsm
));
1135 lsm
.cmd_type
= LTTNG_CREATE_SESSION
;
1136 lttng_ctl_copy_string(lsm
.session
.name
, name
, sizeof(lsm
.session
.name
));
1138 /* There should never be a data URL */
1139 size
= uri_parse_str_urls(url
, NULL
, &uris
);
1141 return -LTTNG_ERR_INVALID
;
1144 lsm
.u
.uri
.size
= size
;
1146 ret
= lttng_ctl_ask_sessiond_varlen(&lsm
, uris
,
1147 sizeof(struct lttng_uri
) * size
, NULL
);
1154 * Destroy session using name.
1155 * Returns size of returned session payload data or a negative error code.
1157 int lttng_destroy_session(const char *session_name
)
1159 struct lttcomm_session_msg lsm
;
1161 if (session_name
== NULL
) {
1162 return -LTTNG_ERR_INVALID
;
1165 memset(&lsm
, 0, sizeof(lsm
));
1166 lsm
.cmd_type
= LTTNG_DESTROY_SESSION
;
1168 lttng_ctl_copy_string(lsm
.session
.name
, session_name
,
1169 sizeof(lsm
.session
.name
));
1171 return lttng_ctl_ask_sessiond(&lsm
, NULL
);
1175 * Ask the session daemon for all available sessions.
1176 * Sets the contents of the sessions array.
1177 * Returns the number of lttng_session entries in sessions;
1178 * on error, returns a negative value.
1180 int lttng_list_sessions(struct lttng_session
**sessions
)
1183 struct lttcomm_session_msg lsm
;
1185 memset(&lsm
, 0, sizeof(lsm
));
1186 lsm
.cmd_type
= LTTNG_LIST_SESSIONS
;
1187 ret
= lttng_ctl_ask_sessiond(&lsm
, (void**) sessions
);
1192 return ret
/ sizeof(struct lttng_session
);
1196 * Ask the session daemon for all available domains of a session.
1197 * Sets the contents of the domains array.
1198 * Returns the number of lttng_domain entries in domains;
1199 * on error, returns a negative value.
1201 int lttng_list_domains(const char *session_name
,
1202 struct lttng_domain
**domains
)
1205 struct lttcomm_session_msg lsm
;
1207 if (session_name
== NULL
) {
1208 return -LTTNG_ERR_INVALID
;
1211 memset(&lsm
, 0, sizeof(lsm
));
1212 lsm
.cmd_type
= LTTNG_LIST_DOMAINS
;
1214 lttng_ctl_copy_string(lsm
.session
.name
, session_name
,
1215 sizeof(lsm
.session
.name
));
1217 ret
= lttng_ctl_ask_sessiond(&lsm
, (void**) domains
);
1222 return ret
/ sizeof(struct lttng_domain
);
1226 * Ask the session daemon for all available channels of a session.
1227 * Sets the contents of the channels array.
1228 * Returns the number of lttng_channel entries in channels;
1229 * on error, returns a negative value.
1231 int lttng_list_channels(struct lttng_handle
*handle
,
1232 struct lttng_channel
**channels
)
1235 struct lttcomm_session_msg lsm
;
1237 if (handle
== NULL
) {
1238 return -LTTNG_ERR_INVALID
;
1241 memset(&lsm
, 0, sizeof(lsm
));
1242 lsm
.cmd_type
= LTTNG_LIST_CHANNELS
;
1243 lttng_ctl_copy_string(lsm
.session
.name
, handle
->session_name
,
1244 sizeof(lsm
.session
.name
));
1246 lttng_ctl_copy_lttng_domain(&lsm
.domain
, &handle
->domain
);
1248 ret
= lttng_ctl_ask_sessiond(&lsm
, (void**) channels
);
1253 return ret
/ sizeof(struct lttng_channel
);
1257 * Ask the session daemon for all available events of a session channel.
1258 * Sets the contents of the events array.
1259 * Returns the number of lttng_event entries in events;
1260 * on error, returns a negative value.
1262 int lttng_list_events(struct lttng_handle
*handle
,
1263 const char *channel_name
, struct lttng_event
**events
)
1266 struct lttcomm_session_msg lsm
;
1268 /* Safety check. An handle and channel name are mandatory */
1269 if (handle
== NULL
|| channel_name
== NULL
) {
1270 return -LTTNG_ERR_INVALID
;
1273 memset(&lsm
, 0, sizeof(lsm
));
1274 lsm
.cmd_type
= LTTNG_LIST_EVENTS
;
1275 lttng_ctl_copy_string(lsm
.session
.name
, handle
->session_name
,
1276 sizeof(lsm
.session
.name
));
1277 lttng_ctl_copy_string(lsm
.u
.list
.channel_name
, channel_name
,
1278 sizeof(lsm
.u
.list
.channel_name
));
1280 lttng_ctl_copy_lttng_domain(&lsm
.domain
, &handle
->domain
);
1282 ret
= lttng_ctl_ask_sessiond(&lsm
, (void**) events
);
1287 return ret
/ sizeof(struct lttng_event
);
1291 * Sets the tracing_group variable with name.
1292 * This function allocates memory pointed to by tracing_group.
1293 * On success, returns 0, on error, returns -1 (null name) or -ENOMEM.
1295 int lttng_set_tracing_group(const char *name
)
1298 return -LTTNG_ERR_INVALID
;
1301 if (asprintf(&tracing_group
, "%s", name
) < 0) {
1302 return -LTTNG_ERR_FATAL
;
1309 * Returns size of returned session payload data or a negative error code.
1311 int lttng_calibrate(struct lttng_handle
*handle
,
1312 struct lttng_calibrate
*calibrate
)
1314 struct lttcomm_session_msg lsm
;
1316 /* Safety check. NULL pointer are forbidden */
1317 if (handle
== NULL
|| calibrate
== NULL
) {
1318 return -LTTNG_ERR_INVALID
;
1321 memset(&lsm
, 0, sizeof(lsm
));
1322 lsm
.cmd_type
= LTTNG_CALIBRATE
;
1323 lttng_ctl_copy_lttng_domain(&lsm
.domain
, &handle
->domain
);
1325 memcpy(&lsm
.u
.calibrate
, calibrate
, sizeof(lsm
.u
.calibrate
));
1327 return lttng_ctl_ask_sessiond(&lsm
, NULL
);
1331 * Set default channel attributes.
1332 * If either or both of the arguments are null, attr content is zeroe'd.
1334 void lttng_channel_set_default_attr(struct lttng_domain
*domain
,
1335 struct lttng_channel_attr
*attr
)
1338 if (attr
== NULL
|| domain
== NULL
) {
1342 memset(attr
, 0, sizeof(struct lttng_channel_attr
));
1344 /* Same for all domains. */
1345 attr
->overwrite
= DEFAULT_CHANNEL_OVERWRITE
;
1346 attr
->tracefile_size
= DEFAULT_CHANNEL_TRACEFILE_SIZE
;
1347 attr
->tracefile_count
= DEFAULT_CHANNEL_TRACEFILE_COUNT
;
1349 switch (domain
->type
) {
1350 case LTTNG_DOMAIN_KERNEL
:
1351 attr
->switch_timer_interval
= DEFAULT_KERNEL_CHANNEL_SWITCH_TIMER
;
1352 attr
->read_timer_interval
= DEFAULT_KERNEL_CHANNEL_READ_TIMER
;
1353 attr
->subbuf_size
= default_get_kernel_channel_subbuf_size();
1354 attr
->num_subbuf
= DEFAULT_KERNEL_CHANNEL_SUBBUF_NUM
;
1355 attr
->output
= DEFAULT_KERNEL_CHANNEL_OUTPUT
;
1357 case LTTNG_DOMAIN_UST
:
1358 switch (domain
->buf_type
) {
1359 case LTTNG_BUFFER_PER_UID
:
1360 attr
->subbuf_size
= default_get_ust_uid_channel_subbuf_size();
1361 attr
->num_subbuf
= DEFAULT_UST_UID_CHANNEL_SUBBUF_NUM
;
1362 attr
->output
= DEFAULT_UST_UID_CHANNEL_OUTPUT
;
1363 attr
->switch_timer_interval
= DEFAULT_UST_UID_CHANNEL_SWITCH_TIMER
;
1364 attr
->read_timer_interval
= DEFAULT_UST_UID_CHANNEL_READ_TIMER
;
1366 case LTTNG_BUFFER_PER_PID
:
1368 attr
->subbuf_size
= default_get_ust_pid_channel_subbuf_size();
1369 attr
->num_subbuf
= DEFAULT_UST_PID_CHANNEL_SUBBUF_NUM
;
1370 attr
->output
= DEFAULT_UST_PID_CHANNEL_OUTPUT
;
1371 attr
->switch_timer_interval
= DEFAULT_UST_PID_CHANNEL_SWITCH_TIMER
;
1372 attr
->read_timer_interval
= DEFAULT_UST_PID_CHANNEL_READ_TIMER
;
1376 /* Default behavior: leave set to 0. */
1382 * Check if session daemon is alive.
1384 * Return 1 if alive or 0 if not.
1385 * On error returns a negative value.
1387 int lttng_session_daemon_alive(void)
1391 ret
= set_session_daemon_path();
1397 if (*sessiond_sock_path
== '\0') {
1399 * No socket path set. Weird error which means the constructor was not
1405 ret
= try_connect_sessiond(sessiond_sock_path
);
1416 * Set URL for a consumer for a session and domain.
1418 * Return 0 on success, else a negative value.
1420 int lttng_set_consumer_url(struct lttng_handle
*handle
,
1421 const char *control_url
, const char *data_url
)
1425 struct lttcomm_session_msg lsm
;
1426 struct lttng_uri
*uris
= NULL
;
1428 if (handle
== NULL
|| (control_url
== NULL
&& data_url
== NULL
)) {
1429 return -LTTNG_ERR_INVALID
;
1432 memset(&lsm
, 0, sizeof(lsm
));
1434 lsm
.cmd_type
= LTTNG_SET_CONSUMER_URI
;
1436 lttng_ctl_copy_string(lsm
.session
.name
, handle
->session_name
,
1437 sizeof(lsm
.session
.name
));
1438 lttng_ctl_copy_lttng_domain(&lsm
.domain
, &handle
->domain
);
1440 size
= uri_parse_str_urls(control_url
, data_url
, &uris
);
1442 return -LTTNG_ERR_INVALID
;
1445 lsm
.u
.uri
.size
= size
;
1447 ret
= lttng_ctl_ask_sessiond_varlen(&lsm
, uris
,
1448 sizeof(struct lttng_uri
) * size
, NULL
);
1457 int lttng_enable_consumer(struct lttng_handle
*handle
)
1465 int lttng_disable_consumer(struct lttng_handle
*handle
)
1471 * This is an extension of create session that is ONLY and SHOULD only be used
1472 * by the lttng command line program. It exists to avoid using URI parsing in
1475 * We need the date and time for the trace path subdirectory for the case where
1476 * the user does NOT define one using either -o or -U. Using the normal
1477 * lttng_create_session API call, we have no clue on the session daemon side if
1478 * the URL was generated automatically by the client or define by the user.
1480 * So this function "wrapper" is hidden from the public API, takes the datetime
1481 * string and appends it if necessary to the URI subdirectory before sending it
1482 * to the session daemon.
1484 * With this extra function, the lttng_create_session call behavior is not
1485 * changed and the timestamp is appended to the URI on the session daemon side
1488 int _lttng_create_session_ext(const char *name
, const char *url
,
1489 const char *datetime
)
1493 struct lttcomm_session_msg lsm
;
1494 struct lttng_uri
*uris
= NULL
;
1496 if (name
== NULL
|| datetime
== NULL
) {
1497 return -LTTNG_ERR_INVALID
;
1500 memset(&lsm
, 0, sizeof(lsm
));
1502 lsm
.cmd_type
= LTTNG_CREATE_SESSION
;
1503 lttng_ctl_copy_string(lsm
.session
.name
, name
, sizeof(lsm
.session
.name
));
1505 /* There should never be a data URL */
1506 size
= uri_parse_str_urls(url
, NULL
, &uris
);
1508 ret
= -LTTNG_ERR_INVALID
;
1512 lsm
.u
.uri
.size
= size
;
1514 if (size
> 0 && uris
[0].dtype
!= LTTNG_DST_PATH
&& strlen(uris
[0].subdir
) == 0) {
1515 /* Don't append datetime if the name was automatically created. */
1516 if (strncmp(name
, DEFAULT_SESSION_NAME
"-",
1517 strlen(DEFAULT_SESSION_NAME
) + 1)) {
1518 ret
= snprintf(uris
[0].subdir
, sizeof(uris
[0].subdir
), "%s-%s",
1521 ret
= snprintf(uris
[0].subdir
, sizeof(uris
[0].subdir
), "%s", name
);
1524 PERROR("snprintf uri subdir");
1525 ret
= -LTTNG_ERR_FATAL
;
1530 ret
= lttng_ctl_ask_sessiond_varlen(&lsm
, uris
,
1531 sizeof(struct lttng_uri
) * size
, NULL
);
1539 * For a given session name, this call checks if the data is ready to be read
1540 * or is still being extracted by the consumer(s) hence not ready to be used by
1543 int lttng_data_pending(const char *session_name
)
1546 struct lttcomm_session_msg lsm
;
1548 if (session_name
== NULL
) {
1549 return -LTTNG_ERR_INVALID
;
1552 memset(&lsm
, 0, sizeof(lsm
));
1553 lsm
.cmd_type
= LTTNG_DATA_PENDING
;
1555 lttng_ctl_copy_string(lsm
.session
.name
, session_name
,
1556 sizeof(lsm
.session
.name
));
1558 ret
= lttng_ctl_ask_sessiond(&lsm
, NULL
);
1561 * The lttng_ctl_ask_sessiond function negate the return code if it's not
1562 * LTTNG_OK so getting -1 means that the reply ret_code was 1 thus meaning
1563 * that the data is available. Yes it is hackish but for now this is the
1574 * Create a session exclusively used for snapshot.
1576 * Returns LTTNG_OK on success or a negative error code.
1578 int lttng_create_session_snapshot(const char *name
, const char *snapshot_url
)
1582 struct lttcomm_session_msg lsm
;
1583 struct lttng_uri
*uris
= NULL
;
1586 return -LTTNG_ERR_INVALID
;
1589 memset(&lsm
, 0, sizeof(lsm
));
1591 lsm
.cmd_type
= LTTNG_CREATE_SESSION_SNAPSHOT
;
1592 lttng_ctl_copy_string(lsm
.session
.name
, name
, sizeof(lsm
.session
.name
));
1594 size
= uri_parse_str_urls(snapshot_url
, NULL
, &uris
);
1596 return -LTTNG_ERR_INVALID
;
1599 lsm
.u
.uri
.size
= size
;
1601 ret
= lttng_ctl_ask_sessiond_varlen(&lsm
, uris
,
1602 sizeof(struct lttng_uri
) * size
, NULL
);
1609 * Create a session exclusively used for live.
1611 * Returns LTTNG_OK on success or a negative error code.
1613 int lttng_create_session_live(const char *name
, const char *url
,
1614 unsigned int timer_interval
)
1618 struct lttcomm_session_msg lsm
;
1619 struct lttng_uri
*uris
= NULL
;
1622 return -LTTNG_ERR_INVALID
;
1625 memset(&lsm
, 0, sizeof(lsm
));
1627 lsm
.cmd_type
= LTTNG_CREATE_SESSION_LIVE
;
1628 lttng_ctl_copy_string(lsm
.session
.name
, name
, sizeof(lsm
.session
.name
));
1631 size
= uri_parse_str_urls(url
, NULL
, &uris
);
1633 ret
= -LTTNG_ERR_INVALID
;
1637 /* file:// is not accepted for live session. */
1638 if (uris
[0].dtype
== LTTNG_DST_PATH
) {
1639 ret
= -LTTNG_ERR_INVALID
;
1646 lsm
.u
.session_live
.nb_uri
= size
;
1647 lsm
.u
.session_live
.timer_interval
= timer_interval
;
1649 ret
= lttng_ctl_ask_sessiond_varlen(&lsm
, uris
,
1650 sizeof(struct lttng_uri
) * size
, NULL
);
1660 static void __attribute__((constructor
)) init()
1662 /* Set default session group */
1663 lttng_set_tracing_group(DEFAULT_TRACING_GROUP
);
1669 static void __attribute__((destructor
)) lttng_ctl_exit()
1671 free(tracing_group
);