4 * Linux Trace Toolkit Control Library
6 * Copyright (C) 2011 David Goulet <david.goulet@polymtl.ca>
7 * Copyright (C) 2016 - Jérémie Galarneau <jeremie.galarneau@efficios.com>
9 * This library is free software; you can redistribute it and/or modify it
10 * under the terms of the GNU Lesser General Public License, version 2.1 only,
11 * as published by the Free Software Foundation.
13 * This library is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 * Lesser General Public License for more details.
18 * You should have received a copy of the GNU Lesser General Public License
19 * along with this library; if not, write to the Free Software Foundation,
20 * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
32 #include <common/common.h>
33 #include <common/defaults.h>
34 #include <common/sessiond-comm/sessiond-comm.h>
35 #include <common/uri.h>
36 #include <common/utils.h>
37 #include <lttng/lttng.h>
38 #include <lttng/health-internal.h>
39 #include <lttng/trigger/trigger-internal.h>
40 #include <lttng/endpoint.h>
41 #include <lttng/channel-internal.h>
43 #include "filter/filter-ast.h"
44 #include "filter/filter-parser.h"
45 #include "filter/filter-bytecode.h"
46 #include "filter/memstream.h"
47 #include "lttng-ctl-helper.h"
50 static const int print_xml
= 1;
51 #define dbg_printf(fmt, args...) \
52 printf("[debug liblttng-ctl] " fmt, ## args)
54 static const int print_xml
= 0;
55 #define dbg_printf(fmt, args...) \
57 /* do nothing but check printf format */ \
59 printf("[debug liblttnctl] " fmt, ## args); \
64 /* Socket to session daemon for communication */
65 static int sessiond_socket
;
66 static char sessiond_sock_path
[PATH_MAX
];
69 static char *tracing_group
;
75 * Those two variables are used by error.h to silent or control the verbosity of
76 * error message. They are global to the library so application linking with it
77 * are able to compile correctly and also control verbosity of the library.
80 int lttng_opt_verbose
;
84 * Copy string from src to dst and enforce null terminated byte.
87 void lttng_ctl_copy_string(char *dst
, const char *src
, size_t len
)
90 strncpy(dst
, src
, len
);
91 /* Enforce the NULL terminated byte */
99 * Copy domain to lttcomm_session_msg domain.
101 * If domain is unknown, default domain will be the kernel.
104 void lttng_ctl_copy_lttng_domain(struct lttng_domain
*dst
,
105 struct lttng_domain
*src
)
109 case LTTNG_DOMAIN_KERNEL
:
110 case LTTNG_DOMAIN_UST
:
111 case LTTNG_DOMAIN_JUL
:
112 case LTTNG_DOMAIN_LOG4J
:
113 case LTTNG_DOMAIN_PYTHON
:
114 memcpy(dst
, src
, sizeof(struct lttng_domain
));
117 memset(dst
, 0, sizeof(struct lttng_domain
));
124 * Send lttcomm_session_msg to the session daemon.
126 * On success, returns the number of bytes sent (>=0)
127 * On error, returns -1
129 static int send_session_msg(struct lttcomm_session_msg
*lsm
)
134 ret
= -LTTNG_ERR_NO_SESSIOND
;
138 DBG("LSM cmd type : %d", lsm
->cmd_type
);
140 ret
= lttcomm_send_creds_unix_sock(sessiond_socket
, lsm
,
141 sizeof(struct lttcomm_session_msg
));
143 ret
= -LTTNG_ERR_FATAL
;
151 * Send var len data to the session daemon.
153 * On success, returns the number of bytes sent (>=0)
154 * On error, returns -1
156 static int send_session_varlen(const void *data
, size_t len
)
161 ret
= -LTTNG_ERR_NO_SESSIOND
;
170 ret
= lttcomm_send_unix_sock(sessiond_socket
, data
, len
);
172 ret
= -LTTNG_ERR_FATAL
;
180 * Receive data from the sessiond socket.
182 * On success, returns the number of bytes received (>=0)
183 * On error, returns -1 (recvmsg() error) or -ENOTCONN
185 static int recv_data_sessiond(void *buf
, size_t len
)
190 ret
= -LTTNG_ERR_NO_SESSIOND
;
194 ret
= lttcomm_recv_unix_sock(sessiond_socket
, buf
, len
);
196 ret
= -LTTNG_ERR_FATAL
;
204 * Check if we are in the specified group.
206 * If yes return 1, else return -1.
209 int lttng_check_tracing_group(void)
211 struct group
*grp_tracing
; /* no free(). See getgrnam(3) */
213 int grp_list_size
, grp_id
, i
;
215 const char *grp_name
= tracing_group
;
217 /* Get GID of group 'tracing' */
218 grp_tracing
= getgrnam(grp_name
);
220 /* If grp_tracing is NULL, the group does not exist. */
224 /* Get number of supplementary group IDs */
225 grp_list_size
= getgroups(0, NULL
);
226 if (grp_list_size
< 0) {
231 /* Alloc group list of the right size */
232 grp_list
= zmalloc(grp_list_size
* sizeof(gid_t
));
237 grp_id
= getgroups(grp_list_size
, grp_list
);
243 for (i
= 0; i
< grp_list_size
; i
++) {
244 if (grp_list
[i
] == grp_tracing
->gr_gid
) {
258 * Try connect to session daemon with sock_path.
260 * Return 0 on success, else -1
262 static int try_connect_sessiond(const char *sock_path
)
266 /* If socket exist, we check if the daemon listens for connect. */
267 ret
= access(sock_path
, F_OK
);
273 ret
= lttcomm_connect_unix_sock(sock_path
);
279 ret
= lttcomm_close_unix_sock(ret
);
281 PERROR("lttcomm_close_unix_sock");
291 * Set sessiond socket path by putting it in the global sessiond_sock_path
294 * Returns 0 on success, negative value on failure (the sessiond socket path
295 * is somehow too long or ENOMEM).
297 static int set_session_daemon_path(void)
299 int in_tgroup
= 0; /* In tracing group. */
305 /* Are we in the tracing group ? */
306 in_tgroup
= lttng_check_tracing_group();
309 if ((uid
== 0) || in_tgroup
) {
310 lttng_ctl_copy_string(sessiond_sock_path
,
311 DEFAULT_GLOBAL_CLIENT_UNIX_SOCK
, sizeof(sessiond_sock_path
));
319 ret
= try_connect_sessiond(sessiond_sock_path
);
323 /* Global session daemon not available... */
325 /* ...or not in tracing group (and not root), default */
328 * With GNU C < 2.1, snprintf returns -1 if the target buffer
330 * With GNU C >= 2.1, snprintf returns the required size
331 * (excluding closing null)
333 ret
= snprintf(sessiond_sock_path
, sizeof(sessiond_sock_path
),
334 DEFAULT_HOME_CLIENT_UNIX_SOCK
, utils_get_home_dir());
335 if ((ret
< 0) || (ret
>= sizeof(sessiond_sock_path
))) {
347 * Connect to the LTTng session daemon.
349 * On success, return 0. On error, return -1.
351 static int connect_sessiond(void)
355 /* Don't try to connect if already connected. */
360 ret
= set_session_daemon_path();
365 /* Connect to the sesssion daemon. */
366 ret
= lttcomm_connect_unix_sock(sessiond_sock_path
);
371 sessiond_socket
= ret
;
381 * Clean disconnect from the session daemon.
383 * On success, return 0. On error, return -1.
385 static int disconnect_sessiond(void)
390 ret
= lttcomm_close_unix_sock(sessiond_socket
);
398 static int recv_sessiond_optional_data(size_t len
, void **user_buf
,
406 ret
= -LTTNG_ERR_INVALID
;
416 ret
= recv_data_sessiond(buf
, len
);
422 ret
= -LTTNG_ERR_INVALID
;
426 /* Move ownership of command header buffer to user. */
431 /* No command header. */
447 * Ask the session daemon a specific command and put the data into buf.
448 * Takes extra var. len. data as input to send to the session daemon.
450 * Return size of data (only payload, not header) or a negative error code.
453 int lttng_ctl_ask_sessiond_varlen(struct lttcomm_session_msg
*lsm
,
454 const void *vardata
, size_t vardata_len
,
455 void **user_payload_buf
, void **user_cmd_header_buf
,
456 size_t *user_cmd_header_len
)
460 struct lttcomm_lttng_msg llm
;
462 ret
= connect_sessiond();
464 ret
= -LTTNG_ERR_NO_SESSIOND
;
468 /* Send command to session daemon */
469 ret
= send_session_msg(lsm
);
471 /* Ret value is a valid lttng error code. */
474 /* Send var len data */
475 ret
= send_session_varlen(vardata
, vardata_len
);
477 /* Ret value is a valid lttng error code. */
481 /* Get header from data transmission */
482 ret
= recv_data_sessiond(&llm
, sizeof(llm
));
484 /* Ret value is a valid lttng error code. */
488 /* Check error code if OK */
489 if (llm
.ret_code
!= LTTNG_OK
) {
494 /* Get command header from data transmission */
495 ret
= recv_sessiond_optional_data(llm
.cmd_header_size
,
496 user_cmd_header_buf
, user_cmd_header_len
);
501 /* Get payload from data transmission */
502 ret
= recv_sessiond_optional_data(llm
.data_size
, user_payload_buf
,
511 disconnect_sessiond();
516 * Create lttng handle and return pointer.
518 * The returned pointer will be NULL in case of malloc() error.
520 struct lttng_handle
*lttng_create_handle(const char *session_name
,
521 struct lttng_domain
*domain
)
523 struct lttng_handle
*handle
= NULL
;
525 handle
= zmalloc(sizeof(struct lttng_handle
));
526 if (handle
== NULL
) {
527 PERROR("malloc handle");
531 /* Copy session name */
532 lttng_ctl_copy_string(handle
->session_name
, session_name
,
533 sizeof(handle
->session_name
));
535 /* Copy lttng domain or leave initialized to 0. */
537 lttng_ctl_copy_lttng_domain(&handle
->domain
, domain
);
545 * Destroy handle by free(3) the pointer.
547 void lttng_destroy_handle(struct lttng_handle
*handle
)
553 * Register an outside consumer.
555 * Returns size of returned session payload data or a negative error code.
557 int lttng_register_consumer(struct lttng_handle
*handle
,
558 const char *socket_path
)
560 struct lttcomm_session_msg lsm
;
562 if (handle
== NULL
|| socket_path
== NULL
) {
563 return -LTTNG_ERR_INVALID
;
566 memset(&lsm
, 0, sizeof(lsm
));
567 lsm
.cmd_type
= LTTNG_REGISTER_CONSUMER
;
568 lttng_ctl_copy_string(lsm
.session
.name
, handle
->session_name
,
569 sizeof(lsm
.session
.name
));
570 lttng_ctl_copy_lttng_domain(&lsm
.domain
, &handle
->domain
);
572 lttng_ctl_copy_string(lsm
.u
.reg
.path
, socket_path
,
573 sizeof(lsm
.u
.reg
.path
));
575 return lttng_ctl_ask_sessiond(&lsm
, NULL
);
579 * Start tracing for all traces of the session.
581 * Returns size of returned session payload data or a negative error code.
583 int lttng_start_tracing(const char *session_name
)
585 struct lttcomm_session_msg lsm
;
587 if (session_name
== NULL
) {
588 return -LTTNG_ERR_INVALID
;
591 memset(&lsm
, 0, sizeof(lsm
));
592 lsm
.cmd_type
= LTTNG_START_TRACE
;
594 lttng_ctl_copy_string(lsm
.session
.name
, session_name
,
595 sizeof(lsm
.session
.name
));
597 return lttng_ctl_ask_sessiond(&lsm
, NULL
);
601 * Stop tracing for all traces of the session.
603 static int _lttng_stop_tracing(const char *session_name
, int wait
)
606 struct lttcomm_session_msg lsm
;
608 if (session_name
== NULL
) {
609 return -LTTNG_ERR_INVALID
;
612 memset(&lsm
, 0, sizeof(lsm
));
613 lsm
.cmd_type
= LTTNG_STOP_TRACE
;
615 lttng_ctl_copy_string(lsm
.session
.name
, session_name
,
616 sizeof(lsm
.session
.name
));
618 ret
= lttng_ctl_ask_sessiond(&lsm
, NULL
);
619 if (ret
< 0 && ret
!= -LTTNG_ERR_TRACE_ALREADY_STOPPED
) {
627 /* Check for data availability */
629 data_ret
= lttng_data_pending(session_name
);
631 /* Return the data available call error. */
637 * Data sleep time before retrying (in usec). Don't sleep if the
638 * call returned value indicates availability.
641 usleep(DEFAULT_DATA_AVAILABILITY_WAIT_TIME
);
643 } while (data_ret
!= 0);
651 * Stop tracing and wait for data availability.
653 int lttng_stop_tracing(const char *session_name
)
655 return _lttng_stop_tracing(session_name
, 1);
659 * Stop tracing but _don't_ wait for data availability.
661 int lttng_stop_tracing_no_wait(const char *session_name
)
663 return _lttng_stop_tracing(session_name
, 0);
667 * Add context to a channel.
669 * If the given channel is NULL, add the contexts to all channels.
670 * The event_name param is ignored.
672 * Returns the size of the returned payload data or a negative error code.
674 int lttng_add_context(struct lttng_handle
*handle
,
675 struct lttng_event_context
*ctx
, const char *event_name
,
676 const char *channel_name
)
681 struct lttcomm_session_msg lsm
;
683 /* Safety check. Both are mandatory. */
684 if (handle
== NULL
|| ctx
== NULL
) {
685 ret
= -LTTNG_ERR_INVALID
;
689 memset(&lsm
, 0, sizeof(lsm
));
690 lsm
.cmd_type
= LTTNG_ADD_CONTEXT
;
692 /* If no channel name, send empty string. */
693 if (channel_name
== NULL
) {
694 lttng_ctl_copy_string(lsm
.u
.context
.channel_name
, "",
695 sizeof(lsm
.u
.context
.channel_name
));
697 lttng_ctl_copy_string(lsm
.u
.context
.channel_name
, channel_name
,
698 sizeof(lsm
.u
.context
.channel_name
));
701 lttng_ctl_copy_lttng_domain(&lsm
.domain
, &handle
->domain
);
702 lttng_ctl_copy_string(lsm
.session
.name
, handle
->session_name
,
703 sizeof(lsm
.session
.name
));
705 if (ctx
->ctx
== LTTNG_EVENT_CONTEXT_APP_CONTEXT
) {
706 size_t provider_len
, ctx_len
;
707 const char *provider_name
= ctx
->u
.app_ctx
.provider_name
;
708 const char *ctx_name
= ctx
->u
.app_ctx
.ctx_name
;
710 if (!provider_name
|| !ctx_name
) {
711 ret
= -LTTNG_ERR_INVALID
;
715 provider_len
= strlen(provider_name
);
716 if (provider_len
== 0) {
717 ret
= -LTTNG_ERR_INVALID
;
720 lsm
.u
.context
.provider_name_len
= provider_len
;
722 ctx_len
= strlen(ctx_name
);
724 ret
= -LTTNG_ERR_INVALID
;
727 lsm
.u
.context
.context_name_len
= ctx_len
;
729 len
= provider_len
+ ctx_len
;
732 ret
= -LTTNG_ERR_NOMEM
;
736 memcpy(buf
, provider_name
, provider_len
);
737 memcpy(buf
+ provider_len
, ctx_name
, ctx_len
);
739 memcpy(&lsm
.u
.context
.ctx
, ctx
, sizeof(struct lttng_event_context
));
741 if (ctx
->ctx
== LTTNG_EVENT_CONTEXT_APP_CONTEXT
) {
743 * Don't leak application addresses to the sessiond.
744 * This is only necessary when ctx is for an app ctx otherwise
745 * the values inside the union (type & config) are overwritten.
747 lsm
.u
.context
.ctx
.u
.app_ctx
.provider_name
= NULL
;
748 lsm
.u
.context
.ctx
.u
.app_ctx
.ctx_name
= NULL
;
751 ret
= lttng_ctl_ask_sessiond_varlen_no_cmd_header(&lsm
, buf
, len
, NULL
);
758 * Enable event(s) for a channel.
760 * If no event name is specified, all events are enabled.
761 * If no channel name is specified, the default 'channel0' is used.
763 * Returns size of returned session payload data or a negative error code.
765 int lttng_enable_event(struct lttng_handle
*handle
,
766 struct lttng_event
*ev
, const char *channel_name
)
768 return lttng_enable_event_with_exclusions(handle
, ev
, channel_name
,
773 * Create or enable an event with a filter expression.
775 * Return negative error value on error.
776 * Return size of returned session payload data if OK.
778 int lttng_enable_event_with_filter(struct lttng_handle
*handle
,
779 struct lttng_event
*event
, const char *channel_name
,
780 const char *filter_expression
)
782 return lttng_enable_event_with_exclusions(handle
, event
, channel_name
,
783 filter_expression
, 0, NULL
);
787 * Depending on the event, return a newly allocated agent filter expression or
788 * NULL if not applicable.
790 * An event with NO loglevel and the name is * will return NULL.
792 static char *set_agent_filter(const char *filter
, struct lttng_event
*ev
)
795 char *agent_filter
= NULL
;
799 /* Don't add filter for the '*' event. */
800 if (strcmp(ev
->name
, "*") != 0) {
802 err
= asprintf(&agent_filter
, "(%s) && (logger_name == \"%s\")", filter
,
805 err
= asprintf(&agent_filter
, "logger_name == \"%s\"", ev
->name
);
813 /* Add loglevel filtering if any for the JUL domain. */
814 if (ev
->loglevel_type
!= LTTNG_EVENT_LOGLEVEL_ALL
) {
817 if (ev
->loglevel_type
== LTTNG_EVENT_LOGLEVEL_RANGE
) {
823 if (filter
|| agent_filter
) {
826 err
= asprintf(&new_filter
, "(%s) && (int_loglevel %s %d)",
827 agent_filter
? agent_filter
: filter
, op
,
832 agent_filter
= new_filter
;
834 err
= asprintf(&agent_filter
, "int_loglevel %s %d", op
,
850 * Generate the filter bytecode from a given filter expression string. Put the
851 * newly allocated parser context in ctxp and populate the lsm object with the
854 * Return 0 on success else a LTTNG_ERR_* code and ctxp is untouched.
856 static int generate_filter(char *filter_expression
,
857 struct lttcomm_session_msg
*lsm
, struct filter_parser_ctx
**ctxp
)
860 struct filter_parser_ctx
*ctx
= NULL
;
863 assert(filter_expression
);
868 * Casting const to non-const, as the underlying function will use it in
871 fmem
= lttng_fmemopen((void *) filter_expression
,
872 strlen(filter_expression
), "r");
874 fprintf(stderr
, "Error opening memory as stream\n");
875 ret
= -LTTNG_ERR_FILTER_NOMEM
;
878 ctx
= filter_parser_ctx_alloc(fmem
);
880 fprintf(stderr
, "Error allocating parser\n");
881 ret
= -LTTNG_ERR_FILTER_NOMEM
;
882 goto filter_alloc_error
;
884 ret
= filter_parser_ctx_append_ast(ctx
);
886 fprintf(stderr
, "Parse error\n");
887 ret
= -LTTNG_ERR_FILTER_INVAL
;
891 ret
= filter_visitor_print_xml(ctx
, stdout
, 0);
894 fprintf(stderr
, "XML print error\n");
895 ret
= -LTTNG_ERR_FILTER_INVAL
;
900 dbg_printf("Generating IR... ");
902 ret
= filter_visitor_ir_generate(ctx
);
904 fprintf(stderr
, "Generate IR error\n");
905 ret
= -LTTNG_ERR_FILTER_INVAL
;
908 dbg_printf("done\n");
910 dbg_printf("Validating IR... ");
912 ret
= filter_visitor_ir_check_binary_op_nesting(ctx
);
914 ret
= -LTTNG_ERR_FILTER_INVAL
;
918 /* Normalize globbing patterns in the expression. */
919 ret
= filter_visitor_ir_normalize_glob_patterns(ctx
);
921 ret
= -LTTNG_ERR_FILTER_INVAL
;
925 /* Validate strings used as literals in the expression. */
926 ret
= filter_visitor_ir_validate_string(ctx
);
928 ret
= -LTTNG_ERR_FILTER_INVAL
;
932 /* Validate globbing patterns in the expression. */
933 ret
= filter_visitor_ir_validate_globbing(ctx
);
935 ret
= -LTTNG_ERR_FILTER_INVAL
;
939 dbg_printf("done\n");
941 dbg_printf("Generating bytecode... ");
943 ret
= filter_visitor_bytecode_generate(ctx
);
945 fprintf(stderr
, "Generate bytecode error\n");
946 ret
= -LTTNG_ERR_FILTER_INVAL
;
949 dbg_printf("done\n");
950 dbg_printf("Size of bytecode generated: %u bytes.\n",
951 bytecode_get_len(&ctx
->bytecode
->b
));
953 lsm
->u
.enable
.bytecode_len
= sizeof(ctx
->bytecode
->b
)
954 + bytecode_get_len(&ctx
->bytecode
->b
);
955 lsm
->u
.enable
.expression_len
= strlen(filter_expression
) + 1;
957 /* No need to keep the memory stream. */
958 if (fclose(fmem
) != 0) {
967 filter_parser_ctx_free(ctx
);
969 if (fclose(fmem
) != 0) {
977 * Enable event(s) for a channel, possibly with exclusions and a filter.
978 * If no event name is specified, all events are enabled.
979 * If no channel name is specified, the default name is used.
980 * If filter expression is not NULL, the filter is set for the event.
981 * If exclusion count is not zero, the exclusions are set for the event.
982 * Returns size of returned session payload data or a negative error code.
984 int lttng_enable_event_with_exclusions(struct lttng_handle
*handle
,
985 struct lttng_event
*ev
, const char *channel_name
,
986 const char *original_filter_expression
,
987 int exclusion_count
, char **exclusion_list
)
989 struct lttcomm_session_msg lsm
;
992 unsigned int free_filter_expression
= 0;
993 struct filter_parser_ctx
*ctx
= NULL
;
995 * Cast as non-const since we may replace the filter expression
996 * by a dynamically allocated string. Otherwise, the original
997 * string is not modified.
999 char *filter_expression
= (char *) original_filter_expression
;
1001 if (handle
== NULL
|| ev
== NULL
) {
1002 ret
= -LTTNG_ERR_INVALID
;
1007 * Empty filter string will always be rejected by the parser
1008 * anyway, so treat this corner-case early to eliminate
1009 * lttng_fmemopen error for 0-byte allocation.
1011 if (filter_expression
&& filter_expression
[0] == '\0') {
1012 ret
= -LTTNG_ERR_INVALID
;
1016 memset(&lsm
, 0, sizeof(lsm
));
1018 /* If no channel name, send empty string. */
1019 if (channel_name
== NULL
) {
1020 lttng_ctl_copy_string(lsm
.u
.enable
.channel_name
, "",
1021 sizeof(lsm
.u
.enable
.channel_name
));
1023 lttng_ctl_copy_string(lsm
.u
.enable
.channel_name
, channel_name
,
1024 sizeof(lsm
.u
.enable
.channel_name
));
1027 lsm
.cmd_type
= LTTNG_ENABLE_EVENT
;
1028 if (ev
->name
[0] == '\0') {
1029 /* Enable all events */
1030 lttng_ctl_copy_string(ev
->name
, "*", sizeof(ev
->name
));
1033 lttng_ctl_copy_lttng_domain(&lsm
.domain
, &handle
->domain
);
1034 /* FIXME: copying non-packed struct to packed struct. */
1035 memcpy(&lsm
.u
.enable
.event
, ev
, sizeof(lsm
.u
.enable
.event
));
1037 lttng_ctl_copy_string(lsm
.session
.name
, handle
->session_name
,
1038 sizeof(lsm
.session
.name
));
1039 lsm
.u
.enable
.exclusion_count
= exclusion_count
;
1040 lsm
.u
.enable
.bytecode_len
= 0;
1043 * For the JUL domain, a filter is enforced except for the enable all
1044 * event. This is done to avoid having the event in all sessions thus
1045 * filtering by logger name.
1047 if (exclusion_count
== 0 && filter_expression
== NULL
&&
1048 (handle
->domain
.type
!= LTTNG_DOMAIN_JUL
&&
1049 handle
->domain
.type
!= LTTNG_DOMAIN_LOG4J
&&
1050 handle
->domain
.type
!= LTTNG_DOMAIN_PYTHON
)) {
1055 * We have either a filter or some exclusions, so we need to set up
1056 * a variable-length memory block from where to send the data.
1059 /* Parse filter expression. */
1060 if (filter_expression
!= NULL
|| handle
->domain
.type
== LTTNG_DOMAIN_JUL
1061 || handle
->domain
.type
== LTTNG_DOMAIN_LOG4J
1062 || handle
->domain
.type
== LTTNG_DOMAIN_PYTHON
) {
1063 if (handle
->domain
.type
== LTTNG_DOMAIN_JUL
||
1064 handle
->domain
.type
== LTTNG_DOMAIN_LOG4J
||
1065 handle
->domain
.type
== LTTNG_DOMAIN_PYTHON
) {
1068 /* Setup JUL filter if needed. */
1069 agent_filter
= set_agent_filter(filter_expression
, ev
);
1070 if (!agent_filter
) {
1071 if (!filter_expression
) {
1073 * No JUL and no filter, just skip
1080 * With an agent filter, the original filter has
1081 * been added to it thus replace the filter
1084 filter_expression
= agent_filter
;
1085 free_filter_expression
= 1;
1089 ret
= generate_filter(filter_expression
, &lsm
, &ctx
);
1095 varlen_data
= zmalloc(lsm
.u
.enable
.bytecode_len
1096 + lsm
.u
.enable
.expression_len
1097 + LTTNG_SYMBOL_NAME_LEN
* exclusion_count
);
1099 ret
= -LTTNG_ERR_EXCLUSION_NOMEM
;
1103 /* Put exclusion names first in the data. */
1104 while (exclusion_count
--) {
1105 strncpy(varlen_data
+ LTTNG_SYMBOL_NAME_LEN
* exclusion_count
,
1106 *(exclusion_list
+ exclusion_count
),
1107 LTTNG_SYMBOL_NAME_LEN
- 1);
1109 /* Add filter expression next. */
1110 if (lsm
.u
.enable
.expression_len
!= 0) {
1112 + LTTNG_SYMBOL_NAME_LEN
* lsm
.u
.enable
.exclusion_count
,
1114 lsm
.u
.enable
.expression_len
);
1116 /* Add filter bytecode next. */
1117 if (ctx
&& lsm
.u
.enable
.bytecode_len
!= 0) {
1119 + LTTNG_SYMBOL_NAME_LEN
* lsm
.u
.enable
.exclusion_count
1120 + lsm
.u
.enable
.expression_len
,
1122 lsm
.u
.enable
.bytecode_len
);
1125 ret
= lttng_ctl_ask_sessiond_varlen_no_cmd_header(&lsm
, varlen_data
,
1126 (LTTNG_SYMBOL_NAME_LEN
* lsm
.u
.enable
.exclusion_count
) +
1127 lsm
.u
.enable
.bytecode_len
+ lsm
.u
.enable
.expression_len
,
1132 if (filter_expression
&& ctx
) {
1133 filter_bytecode_free(ctx
);
1134 filter_ir_free(ctx
);
1135 filter_parser_ctx_free(ctx
);
1138 if (free_filter_expression
) {
1140 * The filter expression has been replaced and must be freed as
1141 * it is not the original filter expression received as a
1144 free(filter_expression
);
1148 * Return directly to the caller and don't ask the sessiond since
1149 * something went wrong in the parsing of data above.
1154 ret
= lttng_ctl_ask_sessiond(&lsm
, NULL
);
1158 int lttng_disable_event_ext(struct lttng_handle
*handle
,
1159 struct lttng_event
*ev
, const char *channel_name
,
1160 const char *original_filter_expression
)
1162 struct lttcomm_session_msg lsm
;
1165 unsigned int free_filter_expression
= 0;
1166 struct filter_parser_ctx
*ctx
= NULL
;
1168 * Cast as non-const since we may replace the filter expression
1169 * by a dynamically allocated string. Otherwise, the original
1170 * string is not modified.
1172 char *filter_expression
= (char *) original_filter_expression
;
1174 if (handle
== NULL
|| ev
== NULL
) {
1175 ret
= -LTTNG_ERR_INVALID
;
1180 * Empty filter string will always be rejected by the parser
1181 * anyway, so treat this corner-case early to eliminate
1182 * lttng_fmemopen error for 0-byte allocation.
1184 if (filter_expression
&& filter_expression
[0] == '\0') {
1185 ret
= -LTTNG_ERR_INVALID
;
1189 memset(&lsm
, 0, sizeof(lsm
));
1191 /* If no channel name, send empty string. */
1192 if (channel_name
== NULL
) {
1193 lttng_ctl_copy_string(lsm
.u
.disable
.channel_name
, "",
1194 sizeof(lsm
.u
.disable
.channel_name
));
1196 lttng_ctl_copy_string(lsm
.u
.disable
.channel_name
, channel_name
,
1197 sizeof(lsm
.u
.disable
.channel_name
));
1200 lsm
.cmd_type
= LTTNG_DISABLE_EVENT
;
1202 lttng_ctl_copy_lttng_domain(&lsm
.domain
, &handle
->domain
);
1203 /* FIXME: copying non-packed struct to packed struct. */
1204 memcpy(&lsm
.u
.disable
.event
, ev
, sizeof(lsm
.u
.disable
.event
));
1206 lttng_ctl_copy_string(lsm
.session
.name
, handle
->session_name
,
1207 sizeof(lsm
.session
.name
));
1208 lsm
.u
.disable
.bytecode_len
= 0;
1211 * For the JUL domain, a filter is enforced except for the
1212 * disable all event. This is done to avoid having the event in
1213 * all sessions thus filtering by logger name.
1215 if (filter_expression
== NULL
&&
1216 (handle
->domain
.type
!= LTTNG_DOMAIN_JUL
&&
1217 handle
->domain
.type
!= LTTNG_DOMAIN_LOG4J
&&
1218 handle
->domain
.type
!= LTTNG_DOMAIN_PYTHON
)) {
1223 * We have a filter, so we need to set up a variable-length
1224 * memory block from where to send the data.
1227 /* Parse filter expression */
1228 if (filter_expression
!= NULL
|| handle
->domain
.type
== LTTNG_DOMAIN_JUL
1229 || handle
->domain
.type
== LTTNG_DOMAIN_LOG4J
1230 || handle
->domain
.type
== LTTNG_DOMAIN_PYTHON
) {
1231 if (handle
->domain
.type
== LTTNG_DOMAIN_JUL
||
1232 handle
->domain
.type
== LTTNG_DOMAIN_LOG4J
||
1233 handle
->domain
.type
== LTTNG_DOMAIN_PYTHON
) {
1236 /* Setup JUL filter if needed. */
1237 agent_filter
= set_agent_filter(filter_expression
, ev
);
1238 if (!agent_filter
) {
1239 if (!filter_expression
) {
1241 * No JUL and no filter, just skip
1248 * With a JUL filter, the original filter has
1249 * been added to it thus replace the filter
1252 filter_expression
= agent_filter
;
1253 free_filter_expression
= 1;
1257 ret
= generate_filter(filter_expression
, &lsm
, &ctx
);
1263 varlen_data
= zmalloc(lsm
.u
.disable
.bytecode_len
1264 + lsm
.u
.disable
.expression_len
);
1266 ret
= -LTTNG_ERR_EXCLUSION_NOMEM
;
1270 /* Add filter expression. */
1271 if (lsm
.u
.disable
.expression_len
!= 0) {
1274 lsm
.u
.disable
.expression_len
);
1276 /* Add filter bytecode next. */
1277 if (ctx
&& lsm
.u
.disable
.bytecode_len
!= 0) {
1279 + lsm
.u
.disable
.expression_len
,
1281 lsm
.u
.disable
.bytecode_len
);
1284 ret
= lttng_ctl_ask_sessiond_varlen_no_cmd_header(&lsm
, varlen_data
,
1285 lsm
.u
.disable
.bytecode_len
+ lsm
.u
.disable
.expression_len
, NULL
);
1289 if (filter_expression
&& ctx
) {
1290 filter_bytecode_free(ctx
);
1291 filter_ir_free(ctx
);
1292 filter_parser_ctx_free(ctx
);
1295 if (free_filter_expression
) {
1297 * The filter expression has been replaced and must be freed as
1298 * it is not the original filter expression received as a
1301 free(filter_expression
);
1305 * Return directly to the caller and don't ask the sessiond since
1306 * something went wrong in the parsing of data above.
1311 ret
= lttng_ctl_ask_sessiond(&lsm
, NULL
);
1316 * Disable event(s) of a channel and domain.
1317 * If no event name is specified, all events are disabled.
1318 * If no channel name is specified, the default 'channel0' is used.
1319 * Returns size of returned session payload data or a negative error code.
1321 int lttng_disable_event(struct lttng_handle
*handle
, const char *name
,
1322 const char *channel_name
)
1324 struct lttng_event ev
;
1326 memset(&ev
, 0, sizeof(ev
));
1328 ev
.type
= LTTNG_EVENT_ALL
;
1329 lttng_ctl_copy_string(ev
.name
, name
, sizeof(ev
.name
));
1330 return lttng_disable_event_ext(handle
, &ev
, channel_name
, NULL
);
1333 struct lttng_channel
*lttng_channel_create(struct lttng_domain
*domain
)
1335 struct lttng_channel
*channel
= NULL
;
1336 struct lttng_channel_extended
*extended
= NULL
;
1342 /* Validate domain. */
1343 switch (domain
->type
) {
1344 case LTTNG_DOMAIN_UST
:
1345 switch (domain
->buf_type
) {
1346 case LTTNG_BUFFER_PER_UID
:
1347 case LTTNG_BUFFER_PER_PID
:
1353 case LTTNG_DOMAIN_KERNEL
:
1354 if (domain
->buf_type
!= LTTNG_BUFFER_GLOBAL
) {
1362 channel
= zmalloc(sizeof(*channel
));
1367 extended
= zmalloc(sizeof(*extended
));
1372 channel
->attr
.extended
.ptr
= extended
;
1374 lttng_channel_set_default_attr(domain
, &channel
->attr
);
1382 void lttng_channel_destroy(struct lttng_channel
*channel
)
1388 if (channel
->attr
.extended
.ptr
) {
1389 free(channel
->attr
.extended
.ptr
);
1395 * Enable channel per domain
1396 * Returns size of returned session payload data or a negative error code.
1398 int lttng_enable_channel(struct lttng_handle
*handle
,
1399 struct lttng_channel
*in_chan
)
1401 struct lttcomm_session_msg lsm
;
1403 /* NULL arguments are forbidden. No default values. */
1404 if (handle
== NULL
|| in_chan
== NULL
) {
1405 return -LTTNG_ERR_INVALID
;
1408 memset(&lsm
, 0, sizeof(lsm
));
1409 memcpy(&lsm
.u
.channel
.chan
, in_chan
, sizeof(lsm
.u
.channel
.chan
));
1410 lsm
.u
.channel
.chan
.attr
.extended
.ptr
= NULL
;
1412 if (!in_chan
->attr
.extended
.ptr
) {
1413 struct lttng_channel
*channel
;
1414 struct lttng_channel_extended
*extended
;
1416 channel
= lttng_channel_create(&handle
->domain
);
1418 return -LTTNG_ERR_NOMEM
;
1422 * Create a new channel in order to use default extended
1425 extended
= (struct lttng_channel_extended
*)
1426 channel
->attr
.extended
.ptr
;
1427 memcpy(&lsm
.u
.channel
.extended
, extended
, sizeof(*extended
));
1428 lttng_channel_destroy(channel
);
1430 struct lttng_channel_extended
*extended
;
1432 extended
= (struct lttng_channel_extended
*)
1433 in_chan
->attr
.extended
.ptr
;
1434 memcpy(&lsm
.u
.channel
.extended
, extended
, sizeof(*extended
));
1437 lsm
.cmd_type
= LTTNG_ENABLE_CHANNEL
;
1438 lttng_ctl_copy_lttng_domain(&lsm
.domain
, &handle
->domain
);
1440 lttng_ctl_copy_string(lsm
.session
.name
, handle
->session_name
,
1441 sizeof(lsm
.session
.name
));
1443 return lttng_ctl_ask_sessiond(&lsm
, NULL
);
1447 * All tracing will be stopped for registered events of the channel.
1448 * Returns size of returned session payload data or a negative error code.
1450 int lttng_disable_channel(struct lttng_handle
*handle
, const char *name
)
1452 struct lttcomm_session_msg lsm
;
1454 /* Safety check. Both are mandatory. */
1455 if (handle
== NULL
|| name
== NULL
) {
1456 return -LTTNG_ERR_INVALID
;
1459 memset(&lsm
, 0, sizeof(lsm
));
1461 lsm
.cmd_type
= LTTNG_DISABLE_CHANNEL
;
1463 lttng_ctl_copy_string(lsm
.u
.disable
.channel_name
, name
,
1464 sizeof(lsm
.u
.disable
.channel_name
));
1466 lttng_ctl_copy_lttng_domain(&lsm
.domain
, &handle
->domain
);
1468 lttng_ctl_copy_string(lsm
.session
.name
, handle
->session_name
,
1469 sizeof(lsm
.session
.name
));
1471 return lttng_ctl_ask_sessiond(&lsm
, NULL
);
1475 * Add PID to session tracker.
1476 * Return 0 on success else a negative LTTng error code.
1478 int lttng_track_pid(struct lttng_handle
*handle
, int pid
)
1480 struct lttcomm_session_msg lsm
;
1482 /* NULL arguments are forbidden. No default values. */
1483 if (handle
== NULL
) {
1484 return -LTTNG_ERR_INVALID
;
1487 memset(&lsm
, 0, sizeof(lsm
));
1489 lsm
.cmd_type
= LTTNG_TRACK_PID
;
1490 lsm
.u
.pid_tracker
.pid
= pid
;
1492 lttng_ctl_copy_lttng_domain(&lsm
.domain
, &handle
->domain
);
1494 lttng_ctl_copy_string(lsm
.session
.name
, handle
->session_name
,
1495 sizeof(lsm
.session
.name
));
1497 return lttng_ctl_ask_sessiond(&lsm
, NULL
);
1501 * Remove PID from session tracker.
1502 * Return 0 on success else a negative LTTng error code.
1504 int lttng_untrack_pid(struct lttng_handle
*handle
, int pid
)
1506 struct lttcomm_session_msg lsm
;
1508 /* NULL arguments are forbidden. No default values. */
1509 if (handle
== NULL
) {
1510 return -LTTNG_ERR_INVALID
;
1513 memset(&lsm
, 0, sizeof(lsm
));
1515 lsm
.cmd_type
= LTTNG_UNTRACK_PID
;
1516 lsm
.u
.pid_tracker
.pid
= pid
;
1518 lttng_ctl_copy_lttng_domain(&lsm
.domain
, &handle
->domain
);
1520 lttng_ctl_copy_string(lsm
.session
.name
, handle
->session_name
,
1521 sizeof(lsm
.session
.name
));
1523 return lttng_ctl_ask_sessiond(&lsm
, NULL
);
1527 * Lists all available tracepoints of domain.
1528 * Sets the contents of the events array.
1529 * Returns the number of lttng_event entries in events;
1530 * on error, returns a negative value.
1532 int lttng_list_tracepoints(struct lttng_handle
*handle
,
1533 struct lttng_event
**events
)
1536 struct lttcomm_session_msg lsm
;
1538 if (handle
== NULL
) {
1539 return -LTTNG_ERR_INVALID
;
1542 memset(&lsm
, 0, sizeof(lsm
));
1543 lsm
.cmd_type
= LTTNG_LIST_TRACEPOINTS
;
1544 lttng_ctl_copy_lttng_domain(&lsm
.domain
, &handle
->domain
);
1546 ret
= lttng_ctl_ask_sessiond(&lsm
, (void **) events
);
1551 return ret
/ sizeof(struct lttng_event
);
1555 * Lists all available tracepoint fields of domain.
1556 * Sets the contents of the event field array.
1557 * Returns the number of lttng_event_field entries in events;
1558 * on error, returns a negative value.
1560 int lttng_list_tracepoint_fields(struct lttng_handle
*handle
,
1561 struct lttng_event_field
**fields
)
1564 struct lttcomm_session_msg lsm
;
1566 if (handle
== NULL
) {
1567 return -LTTNG_ERR_INVALID
;
1570 memset(&lsm
, 0, sizeof(lsm
));
1571 lsm
.cmd_type
= LTTNG_LIST_TRACEPOINT_FIELDS
;
1572 lttng_ctl_copy_lttng_domain(&lsm
.domain
, &handle
->domain
);
1574 ret
= lttng_ctl_ask_sessiond(&lsm
, (void **) fields
);
1579 return ret
/ sizeof(struct lttng_event_field
);
1583 * Lists all available kernel system calls. Allocates and sets the contents of
1586 * Returns the number of lttng_event entries in events; on error, returns a
1589 int lttng_list_syscalls(struct lttng_event
**events
)
1592 struct lttcomm_session_msg lsm
;
1595 return -LTTNG_ERR_INVALID
;
1598 memset(&lsm
, 0, sizeof(lsm
));
1599 lsm
.cmd_type
= LTTNG_LIST_SYSCALLS
;
1600 /* Force kernel domain for system calls. */
1601 lsm
.domain
.type
= LTTNG_DOMAIN_KERNEL
;
1603 ret
= lttng_ctl_ask_sessiond(&lsm
, (void **) events
);
1608 return ret
/ sizeof(struct lttng_event
);
1612 * Returns a human readable string describing
1613 * the error code (a negative value).
1615 const char *lttng_strerror(int code
)
1617 return error_get_str(code
);
1621 * Create a brand new session using name and url for destination.
1623 * Returns LTTNG_OK on success or a negative error code.
1625 int lttng_create_session(const char *name
, const char *url
)
1629 struct lttcomm_session_msg lsm
;
1630 struct lttng_uri
*uris
= NULL
;
1633 return -LTTNG_ERR_INVALID
;
1636 memset(&lsm
, 0, sizeof(lsm
));
1638 lsm
.cmd_type
= LTTNG_CREATE_SESSION
;
1639 lttng_ctl_copy_string(lsm
.session
.name
, name
, sizeof(lsm
.session
.name
));
1641 /* There should never be a data URL */
1642 size
= uri_parse_str_urls(url
, NULL
, &uris
);
1644 return -LTTNG_ERR_INVALID
;
1647 lsm
.u
.uri
.size
= size
;
1649 ret
= lttng_ctl_ask_sessiond_varlen_no_cmd_header(&lsm
, uris
,
1650 sizeof(struct lttng_uri
) * size
, NULL
);
1657 * Destroy session using name.
1658 * Returns size of returned session payload data or a negative error code.
1661 int _lttng_destroy_session(const char *session_name
)
1663 struct lttcomm_session_msg lsm
;
1665 if (session_name
== NULL
) {
1666 return -LTTNG_ERR_INVALID
;
1669 memset(&lsm
, 0, sizeof(lsm
));
1670 lsm
.cmd_type
= LTTNG_DESTROY_SESSION
;
1672 lttng_ctl_copy_string(lsm
.session
.name
, session_name
,
1673 sizeof(lsm
.session
.name
));
1675 return lttng_ctl_ask_sessiond(&lsm
, NULL
);
1679 * Stop the session and wait for the data before destroying it
1681 int lttng_destroy_session(const char *session_name
)
1686 * Stop the tracing and wait for the data.
1688 ret
= _lttng_stop_tracing(session_name
, 1);
1689 if (ret
&& ret
!= -LTTNG_ERR_TRACE_ALREADY_STOPPED
) {
1693 ret
= _lttng_destroy_session(session_name
);
1699 * Destroy the session without waiting for the data.
1701 int lttng_destroy_session_no_wait(const char *session_name
)
1706 * Stop the tracing without waiting for the data.
1707 * The session might already have been stopped, so just
1710 ret
= _lttng_stop_tracing(session_name
, 0);
1711 if (ret
&& ret
!= -LTTNG_ERR_TRACE_ALREADY_STOPPED
) {
1715 ret
= _lttng_destroy_session(session_name
);
1721 * Ask the session daemon for all available sessions.
1722 * Sets the contents of the sessions array.
1723 * Returns the number of lttng_session entries in sessions;
1724 * on error, returns a negative value.
1726 int lttng_list_sessions(struct lttng_session
**sessions
)
1729 struct lttcomm_session_msg lsm
;
1731 memset(&lsm
, 0, sizeof(lsm
));
1732 lsm
.cmd_type
= LTTNG_LIST_SESSIONS
;
1733 ret
= lttng_ctl_ask_sessiond(&lsm
, (void**) sessions
);
1738 return ret
/ sizeof(struct lttng_session
);
1741 int lttng_set_session_shm_path(const char *session_name
,
1742 const char *shm_path
)
1744 struct lttcomm_session_msg lsm
;
1746 if (session_name
== NULL
) {
1747 return -LTTNG_ERR_INVALID
;
1750 memset(&lsm
, 0, sizeof(lsm
));
1751 lsm
.cmd_type
= LTTNG_SET_SESSION_SHM_PATH
;
1753 lttng_ctl_copy_string(lsm
.session
.name
, session_name
,
1754 sizeof(lsm
.session
.name
));
1755 lttng_ctl_copy_string(lsm
.u
.set_shm_path
.shm_path
, shm_path
,
1756 sizeof(lsm
.u
.set_shm_path
.shm_path
));
1758 return lttng_ctl_ask_sessiond(&lsm
, NULL
);
1762 * Ask the session daemon for all available domains of a session.
1763 * Sets the contents of the domains array.
1764 * Returns the number of lttng_domain entries in domains;
1765 * on error, returns a negative value.
1767 int lttng_list_domains(const char *session_name
,
1768 struct lttng_domain
**domains
)
1771 struct lttcomm_session_msg lsm
;
1773 if (session_name
== NULL
) {
1774 return -LTTNG_ERR_INVALID
;
1777 memset(&lsm
, 0, sizeof(lsm
));
1778 lsm
.cmd_type
= LTTNG_LIST_DOMAINS
;
1780 lttng_ctl_copy_string(lsm
.session
.name
, session_name
,
1781 sizeof(lsm
.session
.name
));
1783 ret
= lttng_ctl_ask_sessiond(&lsm
, (void**) domains
);
1788 return ret
/ sizeof(struct lttng_domain
);
1792 * Ask the session daemon for all available channels of a session.
1793 * Sets the contents of the channels array.
1794 * Returns the number of lttng_channel entries in channels;
1795 * on error, returns a negative value.
1797 int lttng_list_channels(struct lttng_handle
*handle
,
1798 struct lttng_channel
**channels
)
1801 size_t channel_count
, i
;
1802 const size_t channel_size
= sizeof(struct lttng_channel
) +
1803 sizeof(struct lttng_channel_extended
);
1804 struct lttcomm_session_msg lsm
;
1807 if (handle
== NULL
) {
1808 ret
= -LTTNG_ERR_INVALID
;
1812 memset(&lsm
, 0, sizeof(lsm
));
1813 lsm
.cmd_type
= LTTNG_LIST_CHANNELS
;
1814 lttng_ctl_copy_string(lsm
.session
.name
, handle
->session_name
,
1815 sizeof(lsm
.session
.name
));
1817 lttng_ctl_copy_lttng_domain(&lsm
.domain
, &handle
->domain
);
1819 ret
= lttng_ctl_ask_sessiond(&lsm
, (void**) channels
);
1824 if (ret
% channel_size
) {
1825 ret
= -LTTNG_ERR_UNK
;
1830 channel_count
= (size_t) ret
/ channel_size
;
1832 /* Set extended info pointers */
1833 extended_at
= ((void *) *channels
) +
1834 channel_count
* sizeof(struct lttng_channel
);
1835 for (i
= 0; i
< channel_count
; i
++) {
1836 struct lttng_channel
*chan
= &(*channels
)[i
];
1838 chan
->attr
.extended
.ptr
= extended_at
;
1839 extended_at
+= sizeof(struct lttng_channel_extended
);
1842 ret
= (int) channel_count
;
1848 * Ask the session daemon for all available events of a session channel.
1849 * Sets the contents of the events array.
1850 * Returns the number of lttng_event entries in events;
1851 * on error, returns a negative value.
1853 int lttng_list_events(struct lttng_handle
*handle
,
1854 const char *channel_name
, struct lttng_event
**events
)
1857 struct lttcomm_session_msg lsm
;
1858 struct lttcomm_event_command_header
*cmd_header
= NULL
;
1859 size_t cmd_header_len
;
1860 uint32_t nb_events
, i
;
1863 /* Safety check. An handle and channel name are mandatory */
1864 if (handle
== NULL
|| channel_name
== NULL
) {
1865 return -LTTNG_ERR_INVALID
;
1868 memset(&lsm
, 0, sizeof(lsm
));
1869 lsm
.cmd_type
= LTTNG_LIST_EVENTS
;
1870 lttng_ctl_copy_string(lsm
.session
.name
, handle
->session_name
,
1871 sizeof(lsm
.session
.name
));
1872 lttng_ctl_copy_string(lsm
.u
.list
.channel_name
, channel_name
,
1873 sizeof(lsm
.u
.list
.channel_name
));
1874 lttng_ctl_copy_lttng_domain(&lsm
.domain
, &handle
->domain
);
1876 ret
= lttng_ctl_ask_sessiond_varlen(&lsm
, NULL
, 0, (void **) events
,
1877 (void **) &cmd_header
, &cmd_header_len
);
1882 /* Set number of events and free command header */
1883 nb_events
= cmd_header
->nb_events
;
1884 if (nb_events
> INT_MAX
) {
1888 ret
= (int) nb_events
;
1892 /* Set extended info pointers */
1893 extended_at
= ((void*) (*events
)) +
1894 nb_events
* sizeof(struct lttng_event
);
1896 for (i
= 0; i
< nb_events
; i
++) {
1897 struct lttcomm_event_extended_header
*ext_header
;
1898 struct lttng_event
*event
= &(*events
)[i
];
1900 event
->extended
.ptr
= extended_at
;
1902 (struct lttcomm_event_extended_header
*) extended_at
;
1903 extended_at
+= sizeof(*ext_header
);
1904 extended_at
+= ext_header
->filter_len
;
1906 ext_header
->nb_exclusions
* LTTNG_SYMBOL_NAME_LEN
;
1916 int lttng_event_get_filter_expression(struct lttng_event
*event
,
1917 const char **filter_expression
)
1920 struct lttcomm_event_extended_header
*ext_header
;
1922 if (!event
|| !filter_expression
) {
1923 ret
= -LTTNG_ERR_INVALID
;
1927 ext_header
= event
->extended
.ptr
;
1931 * This can happen since the lttng_event structure is
1932 * used for other tasks where this pointer is never set.
1934 *filter_expression
= NULL
;
1938 if (ext_header
->filter_len
) {
1939 *filter_expression
= ((const char *) (ext_header
)) +
1940 sizeof(*ext_header
);
1942 *filter_expression
= NULL
;
1949 int lttng_event_get_exclusion_name_count(struct lttng_event
*event
)
1952 struct lttcomm_event_extended_header
*ext_header
;
1955 ret
= -LTTNG_ERR_INVALID
;
1959 ext_header
= event
->extended
.ptr
;
1962 * This can happen since the lttng_event structure is
1963 * used for other tasks where this pointer is never set.
1969 if (ext_header
->nb_exclusions
> INT_MAX
) {
1970 ret
= -LTTNG_ERR_OVERFLOW
;
1973 ret
= (int) ext_header
->nb_exclusions
;
1978 int lttng_event_get_exclusion_name(struct lttng_event
*event
,
1979 size_t index
, const char **exclusion_name
)
1982 struct lttcomm_event_extended_header
*ext_header
;
1985 if (!event
|| !exclusion_name
) {
1986 ret
= -LTTNG_ERR_INVALID
;
1990 ext_header
= event
->extended
.ptr
;
1992 ret
= -LTTNG_ERR_INVALID
;
1996 if (index
>= ext_header
->nb_exclusions
) {
1997 ret
= -LTTNG_ERR_INVALID
;
2001 at
= (void *) ext_header
+ sizeof(*ext_header
);
2002 at
+= ext_header
->filter_len
;
2003 at
+= index
* LTTNG_SYMBOL_NAME_LEN
;
2004 *exclusion_name
= at
;
2011 * Sets the tracing_group variable with name.
2012 * This function allocates memory pointed to by tracing_group.
2013 * On success, returns 0, on error, returns -1 (null name) or -ENOMEM.
2015 int lttng_set_tracing_group(const char *name
)
2018 return -LTTNG_ERR_INVALID
;
2021 if (asprintf(&tracing_group
, "%s", name
) < 0) {
2022 return -LTTNG_ERR_FATAL
;
2028 int lttng_calibrate(struct lttng_handle
*handle
,
2029 struct lttng_calibrate
*calibrate
)
2032 * This command was removed in LTTng 2.9.
2034 return -LTTNG_ERR_UND
;
2038 * Set default channel attributes.
2039 * If either or both of the arguments are null, attr content is zeroe'd.
2041 void lttng_channel_set_default_attr(struct lttng_domain
*domain
,
2042 struct lttng_channel_attr
*attr
)
2044 struct lttng_channel_extended
*extended
;
2047 if (attr
== NULL
|| domain
== NULL
) {
2051 extended
= (struct lttng_channel_extended
*) attr
->extended
.ptr
;
2052 memset(attr
, 0, sizeof(struct lttng_channel_attr
));
2054 /* Same for all domains. */
2055 attr
->overwrite
= DEFAULT_CHANNEL_OVERWRITE
;
2056 attr
->tracefile_size
= DEFAULT_CHANNEL_TRACEFILE_SIZE
;
2057 attr
->tracefile_count
= DEFAULT_CHANNEL_TRACEFILE_COUNT
;
2059 switch (domain
->type
) {
2060 case LTTNG_DOMAIN_KERNEL
:
2061 attr
->switch_timer_interval
=
2062 DEFAULT_KERNEL_CHANNEL_SWITCH_TIMER
;
2063 attr
->read_timer_interval
= DEFAULT_KERNEL_CHANNEL_READ_TIMER
;
2064 attr
->subbuf_size
= default_get_kernel_channel_subbuf_size();
2065 attr
->num_subbuf
= DEFAULT_KERNEL_CHANNEL_SUBBUF_NUM
;
2066 attr
->output
= DEFAULT_KERNEL_CHANNEL_OUTPUT
;
2068 extended
->monitor_timer_interval
=
2069 DEFAULT_KERNEL_CHANNEL_MONITOR_TIMER
;
2070 extended
->blocking_timeout
=
2071 DEFAULT_KERNEL_CHANNEL_BLOCKING_TIMEOUT
;
2074 case LTTNG_DOMAIN_UST
:
2075 switch (domain
->buf_type
) {
2076 case LTTNG_BUFFER_PER_UID
:
2077 attr
->subbuf_size
= default_get_ust_uid_channel_subbuf_size();
2078 attr
->num_subbuf
= DEFAULT_UST_UID_CHANNEL_SUBBUF_NUM
;
2079 attr
->output
= DEFAULT_UST_UID_CHANNEL_OUTPUT
;
2080 attr
->switch_timer_interval
=
2081 DEFAULT_UST_UID_CHANNEL_SWITCH_TIMER
;
2082 attr
->read_timer_interval
=
2083 DEFAULT_UST_UID_CHANNEL_READ_TIMER
;
2085 extended
->monitor_timer_interval
=
2086 DEFAULT_UST_UID_CHANNEL_MONITOR_TIMER
;
2087 extended
->blocking_timeout
=
2088 DEFAULT_UST_UID_CHANNEL_BLOCKING_TIMEOUT
;
2091 case LTTNG_BUFFER_PER_PID
:
2093 attr
->subbuf_size
= default_get_ust_pid_channel_subbuf_size();
2094 attr
->num_subbuf
= DEFAULT_UST_PID_CHANNEL_SUBBUF_NUM
;
2095 attr
->output
= DEFAULT_UST_PID_CHANNEL_OUTPUT
;
2096 attr
->switch_timer_interval
=
2097 DEFAULT_UST_PID_CHANNEL_SWITCH_TIMER
;
2098 attr
->read_timer_interval
=
2099 DEFAULT_UST_PID_CHANNEL_READ_TIMER
;
2101 extended
->monitor_timer_interval
=
2102 DEFAULT_UST_PID_CHANNEL_MONITOR_TIMER
;
2103 extended
->blocking_timeout
=
2104 DEFAULT_UST_PID_CHANNEL_BLOCKING_TIMEOUT
;
2109 /* Default behavior: leave set to 0. */
2113 attr
->extended
.ptr
= extended
;
2116 int lttng_channel_get_discarded_event_count(struct lttng_channel
*channel
,
2117 uint64_t *discarded_events
)
2120 struct lttng_channel_extended
*chan_ext
;
2122 if (!channel
|| !discarded_events
) {
2123 ret
= -LTTNG_ERR_INVALID
;
2127 chan_ext
= channel
->attr
.extended
.ptr
;
2130 * This can happen since the lttng_channel structure is
2131 * used for other tasks where this pointer is never set.
2133 *discarded_events
= 0;
2137 *discarded_events
= chan_ext
->discarded_events
;
2142 int lttng_channel_get_lost_packet_count(struct lttng_channel
*channel
,
2143 uint64_t *lost_packets
)
2146 struct lttng_channel_extended
*chan_ext
;
2148 if (!channel
|| !lost_packets
) {
2149 ret
= -LTTNG_ERR_INVALID
;
2153 chan_ext
= channel
->attr
.extended
.ptr
;
2156 * This can happen since the lttng_channel structure is
2157 * used for other tasks where this pointer is never set.
2163 *lost_packets
= chan_ext
->lost_packets
;
2168 int lttng_channel_get_monitor_timer_interval(struct lttng_channel
*chan
,
2169 uint64_t *monitor_timer_interval
)
2173 if (!chan
|| !monitor_timer_interval
) {
2174 ret
= -LTTNG_ERR_INVALID
;
2178 if (!chan
->attr
.extended
.ptr
) {
2179 ret
= -LTTNG_ERR_INVALID
;
2183 *monitor_timer_interval
= ((struct lttng_channel_extended
*)
2184 chan
->attr
.extended
.ptr
)->monitor_timer_interval
;
2189 int lttng_channel_set_monitor_timer_interval(struct lttng_channel
*chan
,
2190 uint64_t monitor_timer_interval
)
2194 if (!chan
|| !chan
->attr
.extended
.ptr
) {
2195 ret
= -LTTNG_ERR_INVALID
;
2199 ((struct lttng_channel_extended
*)
2200 chan
->attr
.extended
.ptr
)->monitor_timer_interval
=
2201 monitor_timer_interval
;
2206 int lttng_channel_get_blocking_timeout(struct lttng_channel
*chan
,
2207 int64_t *blocking_timeout
)
2211 if (!chan
|| !blocking_timeout
) {
2212 ret
= -LTTNG_ERR_INVALID
;
2216 if (!chan
->attr
.extended
.ptr
) {
2217 ret
= -LTTNG_ERR_INVALID
;
2221 *blocking_timeout
= ((struct lttng_channel_extended
*)
2222 chan
->attr
.extended
.ptr
)->blocking_timeout
;
2227 int lttng_channel_set_blocking_timeout(struct lttng_channel
*chan
,
2228 int64_t blocking_timeout
)
2231 int64_t msec_timeout
;
2233 if (!chan
|| !chan
->attr
.extended
.ptr
) {
2234 ret
= -LTTNG_ERR_INVALID
;
2238 if (blocking_timeout
< 0 && blocking_timeout
!= -1) {
2239 ret
= -LTTNG_ERR_INVALID
;
2244 * LTTng-ust's use of poll() to implement this timeout mechanism forces
2245 * us to accept a narrower range of values (msecs expressed as a signed
2248 msec_timeout
= blocking_timeout
/ 1000;
2249 if (msec_timeout
!= (int32_t) msec_timeout
) {
2250 ret
= -LTTNG_ERR_INVALID
;
2254 ((struct lttng_channel_extended
*)
2255 chan
->attr
.extended
.ptr
)->blocking_timeout
=
2262 * Check if session daemon is alive.
2264 * Return 1 if alive or 0 if not.
2265 * On error returns a negative value.
2267 int lttng_session_daemon_alive(void)
2271 ret
= set_session_daemon_path();
2277 if (*sessiond_sock_path
== '\0') {
2279 * No socket path set. Weird error which means the constructor
2285 ret
= try_connect_sessiond(sessiond_sock_path
);
2296 * Set URL for a consumer for a session and domain.
2298 * Return 0 on success, else a negative value.
2300 int lttng_set_consumer_url(struct lttng_handle
*handle
,
2301 const char *control_url
, const char *data_url
)
2305 struct lttcomm_session_msg lsm
;
2306 struct lttng_uri
*uris
= NULL
;
2308 if (handle
== NULL
|| (control_url
== NULL
&& data_url
== NULL
)) {
2309 return -LTTNG_ERR_INVALID
;
2312 memset(&lsm
, 0, sizeof(lsm
));
2314 lsm
.cmd_type
= LTTNG_SET_CONSUMER_URI
;
2316 lttng_ctl_copy_string(lsm
.session
.name
, handle
->session_name
,
2317 sizeof(lsm
.session
.name
));
2318 lttng_ctl_copy_lttng_domain(&lsm
.domain
, &handle
->domain
);
2320 size
= uri_parse_str_urls(control_url
, data_url
, &uris
);
2322 return -LTTNG_ERR_INVALID
;
2325 lsm
.u
.uri
.size
= size
;
2327 ret
= lttng_ctl_ask_sessiond_varlen_no_cmd_header(&lsm
, uris
,
2328 sizeof(struct lttng_uri
) * size
, NULL
);
2337 int lttng_enable_consumer(struct lttng_handle
*handle
)
2345 int lttng_disable_consumer(struct lttng_handle
*handle
)
2351 * This is an extension of create session that is ONLY and SHOULD only be used
2352 * by the lttng command line program. It exists to avoid using URI parsing in
2355 * We need the date and time for the trace path subdirectory for the case where
2356 * the user does NOT define one using either -o or -U. Using the normal
2357 * lttng_create_session API call, we have no clue on the session daemon side if
2358 * the URL was generated automatically by the client or define by the user.
2360 * So this function "wrapper" is hidden from the public API, takes the datetime
2361 * string and appends it if necessary to the URI subdirectory before sending it
2362 * to the session daemon.
2364 * With this extra function, the lttng_create_session call behavior is not
2365 * changed and the timestamp is appended to the URI on the session daemon side
2368 int _lttng_create_session_ext(const char *name
, const char *url
,
2369 const char *datetime
)
2373 struct lttcomm_session_msg lsm
;
2374 struct lttng_uri
*uris
= NULL
;
2376 if (name
== NULL
|| datetime
== NULL
) {
2377 return -LTTNG_ERR_INVALID
;
2380 memset(&lsm
, 0, sizeof(lsm
));
2382 lsm
.cmd_type
= LTTNG_CREATE_SESSION
;
2383 lttng_ctl_copy_string(lsm
.session
.name
, name
, sizeof(lsm
.session
.name
));
2385 /* There should never be a data URL. */
2386 size
= uri_parse_str_urls(url
, NULL
, &uris
);
2388 ret
= -LTTNG_ERR_INVALID
;
2392 lsm
.u
.uri
.size
= size
;
2394 if (size
> 0 && uris
[0].dtype
!= LTTNG_DST_PATH
&& strlen(uris
[0].subdir
) == 0) {
2395 /* Don't append datetime if the name was automatically created. */
2396 if (strncmp(name
, DEFAULT_SESSION_NAME
"-",
2397 strlen(DEFAULT_SESSION_NAME
) + 1)) {
2398 ret
= snprintf(uris
[0].subdir
, sizeof(uris
[0].subdir
), "%s-%s",
2401 ret
= snprintf(uris
[0].subdir
, sizeof(uris
[0].subdir
), "%s", name
);
2404 PERROR("snprintf uri subdir");
2405 ret
= -LTTNG_ERR_FATAL
;
2410 ret
= lttng_ctl_ask_sessiond_varlen_no_cmd_header(&lsm
, uris
,
2411 sizeof(struct lttng_uri
) * size
, NULL
);
2419 * For a given session name, this call checks if the data is ready to be read
2420 * or is still being extracted by the consumer(s) hence not ready to be used by
2423 int lttng_data_pending(const char *session_name
)
2426 struct lttcomm_session_msg lsm
;
2427 uint8_t *pending
= NULL
;
2429 if (session_name
== NULL
) {
2430 return -LTTNG_ERR_INVALID
;
2433 memset(&lsm
, 0, sizeof(lsm
));
2434 lsm
.cmd_type
= LTTNG_DATA_PENDING
;
2436 lttng_ctl_copy_string(lsm
.session
.name
, session_name
,
2437 sizeof(lsm
.session
.name
));
2439 ret
= lttng_ctl_ask_sessiond(&lsm
, (void **) &pending
);
2442 } else if (ret
!= 1) {
2443 /* Unexpected payload size */
2444 ret
= -LTTNG_ERR_INVALID
;
2448 ret
= (int) *pending
;
2455 * Create a session exclusively used for snapshot.
2457 * Returns LTTNG_OK on success or a negative error code.
2459 int lttng_create_session_snapshot(const char *name
, const char *snapshot_url
)
2463 struct lttcomm_session_msg lsm
;
2464 struct lttng_uri
*uris
= NULL
;
2467 return -LTTNG_ERR_INVALID
;
2470 memset(&lsm
, 0, sizeof(lsm
));
2472 lsm
.cmd_type
= LTTNG_CREATE_SESSION_SNAPSHOT
;
2473 lttng_ctl_copy_string(lsm
.session
.name
, name
, sizeof(lsm
.session
.name
));
2475 size
= uri_parse_str_urls(snapshot_url
, NULL
, &uris
);
2477 return -LTTNG_ERR_INVALID
;
2480 lsm
.u
.uri
.size
= size
;
2483 * If the user does not specify a custom subdir, use the session name.
2485 if (size
> 0 && uris
[0].dtype
!= LTTNG_DST_PATH
&& strlen(uris
[0].subdir
) == 0) {
2486 ret
= snprintf(uris
[0].subdir
, sizeof(uris
[0].subdir
), "%s", name
);
2488 PERROR("snprintf uri subdir");
2489 ret
= -LTTNG_ERR_FATAL
;
2494 ret
= lttng_ctl_ask_sessiond_varlen_no_cmd_header(&lsm
, uris
,
2495 sizeof(struct lttng_uri
) * size
, NULL
);
2503 * Create a session exclusively used for live.
2505 * Returns LTTNG_OK on success or a negative error code.
2507 int lttng_create_session_live(const char *name
, const char *url
,
2508 unsigned int timer_interval
)
2512 struct lttcomm_session_msg lsm
;
2513 struct lttng_uri
*uris
= NULL
;
2515 if (name
== NULL
|| timer_interval
== 0) {
2516 return -LTTNG_ERR_INVALID
;
2519 memset(&lsm
, 0, sizeof(lsm
));
2521 lsm
.cmd_type
= LTTNG_CREATE_SESSION_LIVE
;
2522 lttng_ctl_copy_string(lsm
.session
.name
, name
, sizeof(lsm
.session
.name
));
2525 size
= uri_parse_str_urls(url
, NULL
, &uris
);
2527 ret
= -LTTNG_ERR_INVALID
;
2531 /* file:// is not accepted for live session. */
2532 if (uris
[0].dtype
== LTTNG_DST_PATH
) {
2533 ret
= -LTTNG_ERR_INVALID
;
2540 lsm
.u
.session_live
.nb_uri
= size
;
2541 lsm
.u
.session_live
.timer_interval
= timer_interval
;
2543 ret
= lttng_ctl_ask_sessiond_varlen_no_cmd_header(&lsm
, uris
,
2544 sizeof(struct lttng_uri
) * size
, NULL
);
2552 * List PIDs in the tracker.
2554 * enabled is set to whether the PID tracker is enabled.
2555 * pids is set to an allocated array of PIDs currently tracked. On
2556 * success, pids must be freed by the caller.
2557 * nr_pids is set to the number of entries contained by the pids array.
2559 * Returns 0 on success, else a negative LTTng error code.
2561 int lttng_list_tracker_pids(struct lttng_handle
*handle
,
2562 int *_enabled
, int32_t **_pids
, size_t *_nr_pids
)
2566 struct lttcomm_session_msg lsm
;
2570 if (handle
== NULL
) {
2571 return -LTTNG_ERR_INVALID
;
2574 memset(&lsm
, 0, sizeof(lsm
));
2575 lsm
.cmd_type
= LTTNG_LIST_TRACKER_PIDS
;
2576 lttng_ctl_copy_string(lsm
.session
.name
, handle
->session_name
,
2577 sizeof(lsm
.session
.name
));
2578 lttng_ctl_copy_lttng_domain(&lsm
.domain
, &handle
->domain
);
2580 ret
= lttng_ctl_ask_sessiond(&lsm
, (void **) &pids
);
2584 nr_pids
= ret
/ sizeof(int32_t);
2585 if (nr_pids
== 1 && pids
[0] == -1) {
2591 *_enabled
= enabled
;
2593 *_nr_pids
= nr_pids
;
2598 * Regenerate the metadata for a session.
2599 * Return 0 on success, a negative error code on error.
2601 int lttng_regenerate_metadata(const char *session_name
)
2604 struct lttcomm_session_msg lsm
;
2606 if (!session_name
) {
2607 ret
= -LTTNG_ERR_INVALID
;
2611 memset(&lsm
, 0, sizeof(lsm
));
2612 lsm
.cmd_type
= LTTNG_REGENERATE_METADATA
;
2614 lttng_ctl_copy_string(lsm
.session
.name
, session_name
,
2615 sizeof(lsm
.session
.name
));
2617 ret
= lttng_ctl_ask_sessiond(&lsm
, NULL
);
2628 * Deprecated, replaced by lttng_regenerate_metadata.
2630 int lttng_metadata_regenerate(const char *session_name
)
2632 return lttng_regenerate_metadata(session_name
);
2636 * Regenerate the statedump of a session.
2637 * Return 0 on success, a negative error code on error.
2639 int lttng_regenerate_statedump(const char *session_name
)
2642 struct lttcomm_session_msg lsm
;
2644 if (!session_name
) {
2645 ret
= -LTTNG_ERR_INVALID
;
2649 memset(&lsm
, 0, sizeof(lsm
));
2650 lsm
.cmd_type
= LTTNG_REGENERATE_STATEDUMP
;
2652 lttng_ctl_copy_string(lsm
.session
.name
, session_name
,
2653 sizeof(lsm
.session
.name
));
2655 ret
= lttng_ctl_ask_sessiond(&lsm
, NULL
);
2665 int lttng_register_trigger(struct lttng_trigger
*trigger
)
2668 struct lttcomm_session_msg lsm
;
2669 char *trigger_buf
= NULL
;
2670 ssize_t trigger_size
;
2673 ret
= -LTTNG_ERR_INVALID
;
2677 if (!lttng_trigger_validate(trigger
)) {
2678 ret
= -LTTNG_ERR_INVALID_TRIGGER
;
2682 trigger_size
= lttng_trigger_serialize(trigger
, NULL
);
2683 if (trigger_size
< 0) {
2684 ret
= -LTTNG_ERR_UNK
;
2688 trigger_buf
= zmalloc(trigger_size
);
2690 ret
= -LTTNG_ERR_NOMEM
;
2694 memset(&lsm
, 0, sizeof(lsm
));
2695 lsm
.cmd_type
= LTTNG_REGISTER_TRIGGER
;
2696 if (lttng_trigger_serialize(trigger
, trigger_buf
) < 0) {
2697 ret
= -LTTNG_ERR_UNK
;
2701 lsm
.u
.trigger
.length
= (uint32_t) trigger_size
;
2702 ret
= lttng_ctl_ask_sessiond_varlen_no_cmd_header(&lsm
, trigger_buf
,
2703 trigger_size
, NULL
);
2709 int lttng_unregister_trigger(struct lttng_trigger
*trigger
)
2712 struct lttcomm_session_msg lsm
;
2713 char *trigger_buf
= NULL
;
2714 ssize_t trigger_size
;
2717 ret
= -LTTNG_ERR_INVALID
;
2721 if (!lttng_trigger_validate(trigger
)) {
2722 ret
= -LTTNG_ERR_INVALID
;
2726 trigger_size
= lttng_trigger_serialize(trigger
, NULL
);
2727 if (trigger_size
< 0) {
2728 ret
= -LTTNG_ERR_UNK
;
2732 trigger_buf
= zmalloc(trigger_size
);
2734 ret
= -LTTNG_ERR_NOMEM
;
2738 memset(&lsm
, 0, sizeof(lsm
));
2739 lsm
.cmd_type
= LTTNG_UNREGISTER_TRIGGER
;
2740 if (lttng_trigger_serialize(trigger
, trigger_buf
) < 0) {
2741 ret
= -LTTNG_ERR_UNK
;
2745 lsm
.u
.trigger
.length
= (uint32_t) trigger_size
;
2746 ret
= lttng_ctl_ask_sessiond_varlen_no_cmd_header(&lsm
, trigger_buf
,
2747 trigger_size
, NULL
);
2753 int lttng_session_get_current_archive_location(const char *session_name
,
2756 struct lttcomm_session_msg lsm
;
2757 struct lttng_session_get_current_output_return
*output_return
= NULL
;
2761 memset(&lsm
, 0, sizeof(lsm
));
2762 lsm
.cmd_type
= LTTNG_SESSION_GET_CURRENT_OUTPUT
;
2763 ret
= lttng_strncpy(lsm
.session
.name
, session_name
,
2764 sizeof(lsm
.session
.name
));
2766 ret
= -LTTNG_ERR_INVALID
;
2770 ret
= lttng_ctl_ask_sessiond(&lsm
, (void **) &output_return
);
2776 path_len
= lttng_strnlen(output_return
->path
,
2777 sizeof(output_return
->path
));
2778 if (path_len
== 0 || path_len
== sizeof(output_return
->path
)) {
2779 ret
= -LTTNG_ERR_NO_SESSION_OUTPUT
;
2783 *chunk_path
= zmalloc(path_len
+ 1);
2788 memcpy(*chunk_path
, output_return
->path
, path_len
);
2793 free(output_return
);
2800 static void __attribute__((constructor
)) init(void)
2802 /* Set default session group */
2803 lttng_set_tracing_group(DEFAULT_TRACING_GROUP
);
2809 static void __attribute__((destructor
)) lttng_ctl_exit(void)
2811 free(tracing_group
);