4 * Linux Trace Toolkit Control Library
6 * Copyright (C) 2011 EfficiOS Inc.
7 * Copyright (C) 2016 Jérémie Galarneau <jeremie.galarneau@efficios.com>
9 * SPDX-License-Identifier: LGPL-2.1-only
23 #include <common/buffer-view.h>
24 #include <common/common.h>
25 #include <common/compat/string.h>
26 #include <common/defaults.h>
27 #include <common/dynamic-array.h>
28 #include <common/dynamic-buffer.h>
29 #include <common/macros.h>
30 #include <common/sessiond-comm/sessiond-comm.h>
31 #include <common/tracker.h>
32 #include <common/uri.h>
33 #include <common/utils.h>
34 #include <lttng/channel-internal.h>
35 #include <lttng/destruction-handle.h>
36 #include <lttng/endpoint.h>
37 #include <lttng/event-internal.h>
38 #include <lttng/health-internal.h>
39 #include <lttng/lttng.h>
40 #include <lttng/session-descriptor-internal.h>
41 #include <lttng/session-internal.h>
42 #include <lttng/trigger/trigger-internal.h>
43 #include <lttng/userspace-probe-internal.h>
45 #include "filter/filter-ast.h"
46 #include "filter/filter-parser.h"
47 #include "filter/filter-bytecode.h"
48 #include "filter/memstream.h"
49 #include "lttng-ctl-helper.h"
52 static const int print_xml
= 1;
53 #define dbg_printf(fmt, args...) \
54 printf("[debug liblttng-ctl] " fmt, ## args)
56 static const int print_xml
= 0;
57 #define dbg_printf(fmt, args...) \
59 /* do nothing but check printf format */ \
61 printf("[debug liblttnctl] " fmt, ## args); \
65 #define COPY_DOMAIN_PACKED(dst, src) \
67 struct lttng_domain _tmp_domain; \
69 lttng_ctl_copy_lttng_domain(&_tmp_domain, &src); \
73 /* Socket to session daemon for communication */
74 static int sessiond_socket
= -1;
75 static char sessiond_sock_path
[PATH_MAX
];
78 static char *tracing_group
;
84 * Those two variables are used by error.h to silent or control the verbosity of
85 * error message. They are global to the library so application linking with it
86 * are able to compile correctly and also control verbosity of the library.
89 int lttng_opt_verbose
;
93 * Copy domain to lttcomm_session_msg domain.
95 * If domain is unknown, default domain will be the kernel.
98 void lttng_ctl_copy_lttng_domain(struct lttng_domain
*dst
,
99 struct lttng_domain
*src
)
103 case LTTNG_DOMAIN_KERNEL
:
104 case LTTNG_DOMAIN_UST
:
105 case LTTNG_DOMAIN_JUL
:
106 case LTTNG_DOMAIN_LOG4J
:
107 case LTTNG_DOMAIN_PYTHON
:
108 memcpy(dst
, src
, sizeof(struct lttng_domain
));
111 memset(dst
, 0, sizeof(struct lttng_domain
));
118 * Send lttcomm_session_msg to the session daemon.
120 * On success, returns the number of bytes sent (>=0)
121 * On error, returns -1
123 static int send_session_msg(struct lttcomm_session_msg
*lsm
)
128 ret
= -LTTNG_ERR_NO_SESSIOND
;
132 DBG("LSM cmd type : %d", lsm
->cmd_type
);
134 ret
= lttcomm_send_creds_unix_sock(sessiond_socket
, lsm
,
135 sizeof(struct lttcomm_session_msg
));
137 ret
= -LTTNG_ERR_FATAL
;
145 * Send var len data to the session daemon.
147 * On success, returns the number of bytes sent (>=0)
148 * On error, returns -1
150 static int send_session_varlen(const void *data
, size_t len
)
155 ret
= -LTTNG_ERR_NO_SESSIOND
;
164 ret
= lttcomm_send_unix_sock(sessiond_socket
, data
, len
);
166 ret
= -LTTNG_ERR_FATAL
;
174 * Send file descriptors to the session daemon.
176 * On success, returns the number of bytes sent (>=0)
177 * On error, returns -1
179 static int send_session_fds(const int *fds
, size_t nb_fd
)
184 ret
= -LTTNG_ERR_NO_SESSIOND
;
188 if (!fds
|| !nb_fd
) {
193 ret
= lttcomm_send_fds_unix_sock(sessiond_socket
, fds
, nb_fd
);
195 ret
= -LTTNG_ERR_FATAL
;
203 * Receive data from the sessiond socket.
205 * On success, returns the number of bytes received (>=0)
206 * On error, returns -1 (recvmsg() error) or -ENOTCONN
208 static int recv_data_sessiond(void *buf
, size_t len
)
213 ret
= -LTTNG_ERR_NO_SESSIOND
;
217 ret
= lttcomm_recv_unix_sock(sessiond_socket
, buf
, len
);
219 ret
= -LTTNG_ERR_FATAL
;
227 * Check if we are in the specified group.
229 * If yes return 1, else return -1.
232 int lttng_check_tracing_group(void)
234 gid_t
*grp_list
, tracing_gid
;
235 int grp_list_size
, grp_id
, i
;
237 const char *grp_name
= tracing_group
;
239 /* Get GID of group 'tracing' */
240 if (utils_get_group_id(grp_name
, false, &tracing_gid
)) {
241 /* If grp_tracing is NULL, the group does not exist. */
245 /* Get number of supplementary group IDs */
246 grp_list_size
= getgroups(0, NULL
);
247 if (grp_list_size
< 0) {
252 /* Alloc group list of the right size */
253 grp_list
= zmalloc(grp_list_size
* sizeof(gid_t
));
258 grp_id
= getgroups(grp_list_size
, grp_list
);
264 for (i
= 0; i
< grp_list_size
; i
++) {
265 if (grp_list
[i
] == tracing_gid
) {
278 static enum lttng_error_code
check_enough_available_memory(
279 uint64_t num_bytes_requested_per_cpu
)
283 uint64_t best_mem_info
;
284 uint64_t num_bytes_requested_total
;
287 * Get the number of CPU currently online to compute the amount of
288 * memory needed to create a buffer for every CPU.
290 num_cpu
= sysconf(_SC_NPROCESSORS_ONLN
);
292 ret
= LTTNG_ERR_FATAL
;
296 if (num_bytes_requested_per_cpu
> UINT64_MAX
/ (uint64_t) num_cpu
) {
298 ret
= LTTNG_ERR_OVERFLOW
;
302 num_bytes_requested_total
=
303 num_bytes_requested_per_cpu
* (uint64_t) num_cpu
;
306 * Try to get the `MemAvail` field of `/proc/meminfo`. This is the most
307 * reliable estimate we can get but it is only exposed by the kernel
308 * since 3.14. (See Linux kernel commit:
309 * 34e431b0ae398fc54ea69ff85ec700722c9da773)
311 ret
= utils_get_memory_available(&best_mem_info
);
317 * As a backup plan, use `MemTotal` field of `/proc/meminfo`. This
318 * is a sanity check for obvious user error.
320 ret
= utils_get_memory_total(&best_mem_info
);
325 /* No valid source of information. */
326 ret
= LTTNG_ERR_NOMEM
;
330 if (best_mem_info
>= num_bytes_requested_total
) {
333 ret
= LTTNG_ERR_NOMEM
;
340 * Try connect to session daemon with sock_path.
342 * Return 0 on success, else -1
344 static int try_connect_sessiond(const char *sock_path
)
348 /* If socket exist, we check if the daemon listens for connect. */
349 ret
= access(sock_path
, F_OK
);
355 ret
= lttcomm_connect_unix_sock(sock_path
);
361 ret
= lttcomm_close_unix_sock(ret
);
363 PERROR("lttcomm_close_unix_sock");
373 * Set sessiond socket path by putting it in the global sessiond_sock_path
376 * Returns 0 on success, negative value on failure (the sessiond socket path
377 * is somehow too long or ENOMEM).
379 static int set_session_daemon_path(void)
381 int in_tgroup
= 0; /* In tracing group. */
387 /* Are we in the tracing group ? */
388 in_tgroup
= lttng_check_tracing_group();
391 if ((uid
== 0) || in_tgroup
== 1) {
392 const int ret
= lttng_strncpy(sessiond_sock_path
,
393 DEFAULT_GLOBAL_CLIENT_UNIX_SOCK
,
394 sizeof(sessiond_sock_path
));
406 ret
= try_connect_sessiond(sessiond_sock_path
);
410 /* Global session daemon not available... */
412 /* ...or not in tracing group (and not root), default */
415 * With GNU C < 2.1, snprintf returns -1 if the target buffer
417 * With GNU C >= 2.1, snprintf returns the required size
418 * (excluding closing null)
420 ret
= snprintf(sessiond_sock_path
, sizeof(sessiond_sock_path
),
421 DEFAULT_HOME_CLIENT_UNIX_SOCK
, utils_get_home_dir());
422 if ((ret
< 0) || (ret
>= sizeof(sessiond_sock_path
))) {
434 * Connect to the LTTng session daemon.
436 * On success, return the socket's file descriptor. On error, return -1.
438 LTTNG_HIDDEN
int connect_sessiond(void)
442 ret
= set_session_daemon_path();
447 /* Connect to the sesssion daemon. */
448 ret
= lttcomm_connect_unix_sock(sessiond_sock_path
);
459 static void reset_global_sessiond_connection_state(void)
461 sessiond_socket
= -1;
466 * Clean disconnect from the session daemon.
468 * On success, return 0. On error, return -1.
470 static int disconnect_sessiond(void)
475 ret
= lttcomm_close_unix_sock(sessiond_socket
);
476 reset_global_sessiond_connection_state();
482 static int recv_sessiond_optional_data(size_t len
, void **user_buf
,
490 ret
= -LTTNG_ERR_INVALID
;
500 ret
= recv_data_sessiond(buf
, len
);
506 ret
= -LTTNG_ERR_INVALID
;
510 /* Move ownership of command header buffer to user. */
515 /* No command header. */
531 * Ask the session daemon a specific command and put the data into buf.
532 * Takes extra var. len. data and file descriptors as input to send to the
535 * Return size of data (only payload, not header) or a negative error code.
538 int lttng_ctl_ask_sessiond_fds_varlen(struct lttcomm_session_msg
*lsm
,
539 const int *fds
, size_t nb_fd
, const void *vardata
,
540 size_t vardata_len
, void **user_payload_buf
,
541 void **user_cmd_header_buf
, size_t *user_cmd_header_len
)
545 struct lttcomm_lttng_msg llm
;
547 ret
= connect_sessiond();
549 ret
= -LTTNG_ERR_NO_SESSIOND
;
552 sessiond_socket
= ret
;
556 /* Send command to session daemon */
557 ret
= send_session_msg(lsm
);
559 /* Ret value is a valid lttng error code. */
562 /* Send var len data */
563 ret
= send_session_varlen(vardata
, vardata_len
);
565 /* Ret value is a valid lttng error code. */
570 ret
= send_session_fds(fds
, nb_fd
);
572 /* Ret value is a valid lttng error code. */
576 /* Get header from data transmission */
577 ret
= recv_data_sessiond(&llm
, sizeof(llm
));
579 /* Ret value is a valid lttng error code. */
583 /* Check error code if OK */
584 if (llm
.ret_code
!= LTTNG_OK
) {
589 /* Get command header from data transmission */
590 ret
= recv_sessiond_optional_data(llm
.cmd_header_size
,
591 user_cmd_header_buf
, user_cmd_header_len
);
596 /* Get payload from data transmission */
597 ret
= recv_sessiond_optional_data(llm
.data_size
, user_payload_buf
,
606 disconnect_sessiond();
611 * Create lttng handle and return pointer.
613 * The returned pointer will be NULL in case of malloc() error.
615 struct lttng_handle
*lttng_create_handle(const char *session_name
,
616 struct lttng_domain
*domain
)
619 struct lttng_handle
*handle
= NULL
;
621 handle
= zmalloc(sizeof(struct lttng_handle
));
622 if (handle
== NULL
) {
623 PERROR("malloc handle");
627 /* Copy session name */
628 ret
= lttng_strncpy(handle
->session_name
, session_name
? : "",
629 sizeof(handle
->session_name
));
634 /* Copy lttng domain or leave initialized to 0. */
636 lttng_ctl_copy_lttng_domain(&handle
->domain
, domain
);
647 * Destroy handle by free(3) the pointer.
649 void lttng_destroy_handle(struct lttng_handle
*handle
)
655 * Register an outside consumer.
657 * Returns size of returned session payload data or a negative error code.
659 int lttng_register_consumer(struct lttng_handle
*handle
,
660 const char *socket_path
)
663 struct lttcomm_session_msg lsm
;
665 if (handle
== NULL
|| socket_path
== NULL
) {
666 ret
= -LTTNG_ERR_INVALID
;
670 memset(&lsm
, 0, sizeof(lsm
));
671 lsm
.cmd_type
= LTTNG_REGISTER_CONSUMER
;
672 ret
= lttng_strncpy(lsm
.session
.name
, handle
->session_name
,
673 sizeof(lsm
.session
.name
));
675 ret
= -LTTNG_ERR_INVALID
;
679 COPY_DOMAIN_PACKED(lsm
.domain
, handle
->domain
);
681 ret
= lttng_strncpy(lsm
.u
.reg
.path
, socket_path
,
682 sizeof(lsm
.u
.reg
.path
));
684 ret
= -LTTNG_ERR_INVALID
;
688 ret
= lttng_ctl_ask_sessiond(&lsm
, NULL
);
694 * Start tracing for all traces of the session.
696 * Returns size of returned session payload data or a negative error code.
698 int lttng_start_tracing(const char *session_name
)
701 struct lttcomm_session_msg lsm
;
703 if (session_name
== NULL
) {
704 ret
= -LTTNG_ERR_INVALID
;
708 memset(&lsm
, 0, sizeof(lsm
));
709 lsm
.cmd_type
= LTTNG_START_TRACE
;
711 ret
= lttng_strncpy(lsm
.session
.name
, session_name
,
712 sizeof(lsm
.session
.name
));
714 ret
= -LTTNG_ERR_INVALID
;
718 ret
= lttng_ctl_ask_sessiond(&lsm
, NULL
);
724 * Stop tracing for all traces of the session.
726 static int _lttng_stop_tracing(const char *session_name
, int wait
)
729 struct lttcomm_session_msg lsm
;
731 if (session_name
== NULL
) {
732 ret
= -LTTNG_ERR_INVALID
;
736 memset(&lsm
, 0, sizeof(lsm
));
737 lsm
.cmd_type
= LTTNG_STOP_TRACE
;
739 ret
= lttng_strncpy(lsm
.session
.name
, session_name
,
740 sizeof(lsm
.session
.name
));
742 ret
= -LTTNG_ERR_INVALID
;
746 ret
= lttng_ctl_ask_sessiond(&lsm
, NULL
);
747 if (ret
< 0 && ret
!= -LTTNG_ERR_TRACE_ALREADY_STOPPED
) {
755 /* Check for data availability */
757 data_ret
= lttng_data_pending(session_name
);
759 /* Return the data available call error. */
765 * Data sleep time before retrying (in usec). Don't sleep if the
766 * call returned value indicates availability.
769 usleep(DEFAULT_DATA_AVAILABILITY_WAIT_TIME_US
);
771 } while (data_ret
!= 0);
779 * Stop tracing and wait for data availability.
781 int lttng_stop_tracing(const char *session_name
)
783 return _lttng_stop_tracing(session_name
, 1);
787 * Stop tracing but _don't_ wait for data availability.
789 int lttng_stop_tracing_no_wait(const char *session_name
)
791 return _lttng_stop_tracing(session_name
, 0);
795 * Add context to a channel.
797 * If the given channel is NULL, add the contexts to all channels.
798 * The event_name param is ignored.
800 * Returns the size of the returned payload data or a negative error code.
802 int lttng_add_context(struct lttng_handle
*handle
,
803 struct lttng_event_context
*ctx
, const char *event_name
,
804 const char *channel_name
)
807 struct lttcomm_session_msg lsm
;
808 struct lttng_dynamic_buffer buffer
;
810 lttng_dynamic_buffer_init(&buffer
);
812 /* Safety check. Both are mandatory. */
813 if (handle
== NULL
|| ctx
== NULL
) {
814 ret
= -LTTNG_ERR_INVALID
;
818 memset(&lsm
, 0, sizeof(lsm
));
819 lsm
.cmd_type
= LTTNG_ADD_CONTEXT
;
821 /* If no channel name, send empty string. */
822 ret
= lttng_strncpy(lsm
.u
.context
.channel_name
, channel_name
?: "",
823 sizeof(lsm
.u
.context
.channel_name
));
825 ret
= -LTTNG_ERR_INVALID
;
829 COPY_DOMAIN_PACKED(lsm
.domain
, handle
->domain
);
830 ret
= lttng_strncpy(lsm
.session
.name
, handle
->session_name
,
831 sizeof(lsm
.session
.name
));
833 ret
= -LTTNG_ERR_INVALID
;
837 ret
= lttng_event_context_serialize(ctx
, &buffer
);
839 ret
= -LTTNG_ERR_INVALID
;
843 lsm
.u
.context
.length
= buffer
.size
;
845 ret
= lttng_ctl_ask_sessiond_varlen_no_cmd_header(
846 &lsm
, buffer
.data
, buffer
.size
, NULL
);
848 lttng_dynamic_buffer_reset(&buffer
);
853 * Enable event(s) for a channel.
855 * If no event name is specified, all events are enabled.
856 * If no channel name is specified, the default 'channel0' is used.
858 * Returns size of returned session payload data or a negative error code.
860 int lttng_enable_event(struct lttng_handle
*handle
,
861 struct lttng_event
*ev
, const char *channel_name
)
863 return lttng_enable_event_with_exclusions(handle
, ev
, channel_name
,
868 * Create or enable an event with a filter expression.
870 * Return negative error value on error.
871 * Return size of returned session payload data if OK.
873 int lttng_enable_event_with_filter(struct lttng_handle
*handle
,
874 struct lttng_event
*event
, const char *channel_name
,
875 const char *filter_expression
)
877 return lttng_enable_event_with_exclusions(handle
, event
, channel_name
,
878 filter_expression
, 0, NULL
);
882 * Depending on the event, return a newly allocated agent filter expression or
883 * NULL if not applicable.
885 * An event with NO loglevel and the name is * will return NULL.
887 static char *set_agent_filter(const char *filter
, struct lttng_event
*ev
)
890 char *agent_filter
= NULL
;
894 /* Don't add filter for the '*' event. */
895 if (strcmp(ev
->name
, "*") != 0) {
897 err
= asprintf(&agent_filter
, "(%s) && (logger_name == \"%s\")", filter
,
900 err
= asprintf(&agent_filter
, "logger_name == \"%s\"", ev
->name
);
908 /* Add loglevel filtering if any for the JUL domain. */
909 if (ev
->loglevel_type
!= LTTNG_EVENT_LOGLEVEL_ALL
) {
912 if (ev
->loglevel_type
== LTTNG_EVENT_LOGLEVEL_RANGE
) {
918 if (filter
|| agent_filter
) {
921 err
= asprintf(&new_filter
, "(%s) && (int_loglevel %s %d)",
922 agent_filter
? agent_filter
: filter
, op
,
927 agent_filter
= new_filter
;
929 err
= asprintf(&agent_filter
, "int_loglevel %s %d", op
,
945 * Generate the filter bytecode from a given filter expression string. Put the
946 * newly allocated parser context in ctxp and populate the lsm object with the
949 * Return 0 on success else a LTTNG_ERR_* code and ctxp is untouched.
951 static int generate_filter(char *filter_expression
,
952 size_t *bytecode_len
,
953 struct filter_parser_ctx
**ctxp
)
956 struct filter_parser_ctx
*ctx
= NULL
;
959 assert(filter_expression
);
963 * Casting const to non-const, as the underlying function will use it in
966 fmem
= lttng_fmemopen((void *) filter_expression
,
967 strlen(filter_expression
), "r");
969 fprintf(stderr
, "Error opening memory as stream\n");
970 ret
= -LTTNG_ERR_FILTER_NOMEM
;
973 ctx
= filter_parser_ctx_alloc(fmem
);
975 fprintf(stderr
, "Error allocating parser\n");
976 ret
= -LTTNG_ERR_FILTER_NOMEM
;
977 goto filter_alloc_error
;
979 ret
= filter_parser_ctx_append_ast(ctx
);
981 fprintf(stderr
, "Parse error\n");
982 ret
= -LTTNG_ERR_FILTER_INVAL
;
986 ret
= filter_visitor_print_xml(ctx
, stdout
, 0);
989 fprintf(stderr
, "XML print error\n");
990 ret
= -LTTNG_ERR_FILTER_INVAL
;
995 dbg_printf("Generating IR... ");
997 ret
= filter_visitor_ir_generate(ctx
);
999 fprintf(stderr
, "Generate IR error\n");
1000 ret
= -LTTNG_ERR_FILTER_INVAL
;
1003 dbg_printf("done\n");
1005 dbg_printf("Validating IR... ");
1007 ret
= filter_visitor_ir_check_binary_op_nesting(ctx
);
1009 ret
= -LTTNG_ERR_FILTER_INVAL
;
1013 /* Normalize globbing patterns in the expression. */
1014 ret
= filter_visitor_ir_normalize_glob_patterns(ctx
);
1016 ret
= -LTTNG_ERR_FILTER_INVAL
;
1020 /* Validate strings used as literals in the expression. */
1021 ret
= filter_visitor_ir_validate_string(ctx
);
1023 ret
= -LTTNG_ERR_FILTER_INVAL
;
1027 /* Validate globbing patterns in the expression. */
1028 ret
= filter_visitor_ir_validate_globbing(ctx
);
1030 ret
= -LTTNG_ERR_FILTER_INVAL
;
1034 dbg_printf("done\n");
1036 dbg_printf("Generating bytecode... ");
1038 ret
= filter_visitor_bytecode_generate(ctx
);
1040 fprintf(stderr
, "Generate bytecode error\n");
1041 ret
= -LTTNG_ERR_FILTER_INVAL
;
1044 dbg_printf("done\n");
1045 dbg_printf("Size of bytecode generated: %u bytes.\n",
1046 bytecode_get_len(&ctx
->bytecode
->b
));
1048 *bytecode_len
= sizeof(ctx
->bytecode
->b
) +
1049 bytecode_get_len(&ctx
->bytecode
->b
);
1051 /* No need to keep the memory stream. */
1052 if (fclose(fmem
) != 0) {
1060 filter_ir_free(ctx
);
1061 filter_parser_ctx_free(ctx
);
1063 if (fclose(fmem
) != 0) {
1071 * Enable event(s) for a channel, possibly with exclusions and a filter.
1072 * If no event name is specified, all events are enabled.
1073 * If no channel name is specified, the default name is used.
1074 * If filter expression is not NULL, the filter is set for the event.
1075 * If exclusion count is not zero, the exclusions are set for the event.
1076 * Returns size of returned session payload data or a negative error code.
1078 int lttng_enable_event_with_exclusions(struct lttng_handle
*handle
,
1079 struct lttng_event
*ev
, const char *channel_name
,
1080 const char *original_filter_expression
,
1081 int exclusion_count
, char **exclusion_list
)
1083 struct lttcomm_session_msg lsm
;
1084 struct lttng_dynamic_buffer send_buffer
;
1085 int ret
= 0, fd_to_send
= -1;
1086 bool send_fd
= false;
1087 unsigned int free_filter_expression
= 0;
1088 struct filter_parser_ctx
*ctx
= NULL
;
1089 size_t bytecode_len
= 0;
1092 * We have either a filter or some exclusions, so we need to set up
1093 * a variable-length memory block from where to send the data.
1095 lttng_dynamic_buffer_init(&send_buffer
);
1098 * Cast as non-const since we may replace the filter expression
1099 * by a dynamically allocated string. Otherwise, the original
1100 * string is not modified.
1102 char *filter_expression
= (char *) original_filter_expression
;
1104 if (handle
== NULL
|| ev
== NULL
) {
1105 ret
= -LTTNG_ERR_INVALID
;
1110 * Empty filter string will always be rejected by the parser
1111 * anyway, so treat this corner-case early to eliminate
1112 * lttng_fmemopen error for 0-byte allocation.
1114 if (filter_expression
&& filter_expression
[0] == '\0') {
1115 ret
= -LTTNG_ERR_INVALID
;
1119 if (ev
->name
[0] == '\0') {
1120 /* Enable all events. */
1121 ret
= lttng_strncpy(ev
->name
, "*", sizeof(ev
->name
));
1125 /* Parse filter expression. */
1126 if (filter_expression
!= NULL
|| handle
->domain
.type
== LTTNG_DOMAIN_JUL
1127 || handle
->domain
.type
== LTTNG_DOMAIN_LOG4J
1128 || handle
->domain
.type
== LTTNG_DOMAIN_PYTHON
) {
1129 if (handle
->domain
.type
== LTTNG_DOMAIN_JUL
||
1130 handle
->domain
.type
== LTTNG_DOMAIN_LOG4J
||
1131 handle
->domain
.type
== LTTNG_DOMAIN_PYTHON
) {
1134 /* Setup agent filter if needed. */
1135 agent_filter
= set_agent_filter(filter_expression
, ev
);
1136 if (!agent_filter
) {
1137 if (!filter_expression
) {
1139 * No JUL and no filter, just skip
1146 * With an agent filter, the original filter has
1147 * been added to it thus replace the filter
1150 filter_expression
= agent_filter
;
1151 free_filter_expression
= 1;
1155 if (strnlen(filter_expression
, LTTNG_FILTER_MAX_LEN
) ==
1156 LTTNG_FILTER_MAX_LEN
) {
1157 ret
= -LTTNG_ERR_FILTER_INVAL
;
1161 ret
= generate_filter(filter_expression
, &bytecode_len
, &ctx
);
1166 if (bytecode_len
> LTTNG_FILTER_MAX_LEN
) {
1167 ret
= -LTTNG_ERR_FILTER_INVAL
;
1173 ret
= lttng_event_serialize(ev
, exclusion_count
, exclusion_list
,
1174 filter_expression
, bytecode_len
,
1175 ctx
&& (bytecode_len
!= 0) ? &ctx
->bytecode
->b
: NULL
,
1176 &send_buffer
, &fd_to_send
);
1181 if (fd_to_send
>= 0) {
1185 /* Prepare the command header */
1186 memset(&lsm
, 0, sizeof(lsm
));
1187 lsm
.cmd_type
= LTTNG_ENABLE_EVENT
;
1189 /* If no channel name, send empty string. */
1190 ret
= lttng_strncpy(lsm
.u
.enable
.channel_name
, channel_name
?: "",
1191 sizeof(lsm
.u
.enable
.channel_name
));
1193 ret
= -LTTNG_ERR_INVALID
;
1198 COPY_DOMAIN_PACKED(lsm
.domain
, handle
->domain
);
1201 ret
= lttng_strncpy(lsm
.session
.name
, handle
->session_name
,
1202 sizeof(lsm
.session
.name
));
1204 ret
= -LTTNG_ERR_INVALID
;
1208 /* Length of the serialized event */
1209 lsm
.u
.enable
.length
= (uint32_t) send_buffer
.size
;
1211 ret
= lttng_ctl_ask_sessiond_fds_varlen(&lsm
,
1212 send_fd
? &fd_to_send
: NULL
,
1214 send_buffer
.size
? send_buffer
.data
: NULL
,
1215 send_buffer
.size
, NULL
, NULL
, 0);
1217 if (filter_expression
&& ctx
) {
1218 filter_bytecode_free(ctx
);
1219 filter_ir_free(ctx
);
1220 filter_parser_ctx_free(ctx
);
1223 if (free_filter_expression
) {
1225 * The filter expression has been replaced and must be freed as
1226 * it is not the original filter expression received as a
1229 free(filter_expression
);
1232 lttng_dynamic_buffer_reset(&send_buffer
);
1236 int lttng_disable_event_ext(struct lttng_handle
*handle
,
1237 struct lttng_event
*ev
, const char *channel_name
,
1238 const char *original_filter_expression
)
1240 struct lttcomm_session_msg lsm
;
1241 struct lttng_dynamic_buffer buf
;
1243 unsigned int free_filter_expression
= 0;
1244 struct filter_parser_ctx
*ctx
= NULL
;
1245 size_t bytecode_len
= 0;
1246 int fd_to_send
= -1;
1247 bool send_fd
= false;
1249 * Cast as non-const since we may replace the filter expression
1250 * by a dynamically allocated string. Otherwise, the original
1251 * string is not modified.
1253 char *filter_expression
= (char *) original_filter_expression
;
1255 lttng_dynamic_buffer_init(&buf
);
1257 if (handle
== NULL
|| ev
== NULL
) {
1258 ret
= -LTTNG_ERR_INVALID
;
1263 * Empty filter string will always be rejected by the parser
1264 * anyway, so treat this corner-case early to eliminate
1265 * lttng_fmemopen error for 0-byte allocation.
1267 if (filter_expression
&& filter_expression
[0] == '\0') {
1268 ret
= -LTTNG_ERR_INVALID
;
1272 /* Parse filter expression */
1273 if (filter_expression
!= NULL
|| handle
->domain
.type
== LTTNG_DOMAIN_JUL
1274 || handle
->domain
.type
== LTTNG_DOMAIN_LOG4J
1275 || handle
->domain
.type
== LTTNG_DOMAIN_PYTHON
) {
1276 if (handle
->domain
.type
== LTTNG_DOMAIN_JUL
||
1277 handle
->domain
.type
== LTTNG_DOMAIN_LOG4J
||
1278 handle
->domain
.type
== LTTNG_DOMAIN_PYTHON
) {
1281 /* Setup agent filter if needed. */
1282 agent_filter
= set_agent_filter(filter_expression
, ev
);
1283 if (!agent_filter
) {
1284 if (!filter_expression
) {
1286 * No JUL and no filter, just skip
1293 * With a JUL filter, the original filter has
1294 * been added to it thus replace the filter
1297 filter_expression
= agent_filter
;
1298 free_filter_expression
= 1;
1302 ret
= generate_filter(filter_expression
, &bytecode_len
, &ctx
);
1310 ret
= lttng_event_serialize(ev
, 0, NULL
, filter_expression
,
1312 ctx
&& (bytecode_len
!= 0) ? &ctx
->bytecode
->b
: NULL
,
1319 if (fd_to_send
>= 0) {
1323 /* Prepare command header */
1324 memset(&lsm
, 0, sizeof(lsm
));
1325 lsm
.cmd_type
= LTTNG_DISABLE_EVENT
;
1327 /* If no channel name, send empty string. */
1328 ret
= lttng_strncpy(lsm
.u
.disable
.channel_name
, channel_name
?: "",
1329 sizeof(lsm
.u
.disable
.channel_name
));
1331 ret
= -LTTNG_ERR_INVALID
;
1335 COPY_DOMAIN_PACKED(lsm
.domain
, handle
->domain
);
1338 ret
= lttng_strncpy(lsm
.session
.name
, handle
->session_name
,
1339 sizeof(lsm
.session
.name
));
1341 ret
= -LTTNG_ERR_INVALID
;
1345 /* Length of the serialized event */
1346 lsm
.u
.disable
.length
= (uint32_t) buf
.size
;
1348 ret
= lttng_ctl_ask_sessiond_fds_varlen(&lsm
,
1349 send_fd
? &fd_to_send
: NULL
, send_fd
? 1 : 0,
1350 buf
.size
? buf
.data
: NULL
, buf
.size
, NULL
, NULL
, 0);
1353 if (filter_expression
&& ctx
) {
1354 filter_bytecode_free(ctx
);
1355 filter_ir_free(ctx
);
1356 filter_parser_ctx_free(ctx
);
1359 if (free_filter_expression
) {
1361 * The filter expression has been replaced and must be freed as
1362 * it is not the original filter expression received as a
1365 free(filter_expression
);
1368 lttng_dynamic_buffer_reset(&buf
);
1373 * Disable event(s) of a channel and domain.
1374 * If no event name is specified, all events are disabled.
1375 * If no channel name is specified, the default 'channel0' is used.
1376 * Returns size of returned session payload data or a negative error code.
1378 int lttng_disable_event(struct lttng_handle
*handle
, const char *name
,
1379 const char *channel_name
)
1382 struct lttng_event ev
;
1384 memset(&ev
, 0, sizeof(ev
));
1386 ev
.type
= LTTNG_EVENT_ALL
;
1387 ret
= lttng_strncpy(ev
.name
, name
?: "", sizeof(ev
.name
));
1389 ret
= -LTTNG_ERR_INVALID
;
1393 ret
= lttng_disable_event_ext(handle
, &ev
, channel_name
, NULL
);
1398 struct lttng_channel
*lttng_channel_create(struct lttng_domain
*domain
)
1400 struct lttng_channel
*channel
= NULL
;
1406 /* Validate domain. */
1407 switch (domain
->type
) {
1408 case LTTNG_DOMAIN_UST
:
1409 switch (domain
->buf_type
) {
1410 case LTTNG_BUFFER_PER_UID
:
1411 case LTTNG_BUFFER_PER_PID
:
1417 case LTTNG_DOMAIN_KERNEL
:
1418 if (domain
->buf_type
!= LTTNG_BUFFER_GLOBAL
) {
1426 channel
= lttng_channel_create_internal();
1431 lttng_channel_set_default_attr(domain
, &channel
->attr
);
1436 void lttng_channel_destroy(struct lttng_channel
*channel
)
1442 if (channel
->attr
.extended
.ptr
) {
1443 free(channel
->attr
.extended
.ptr
);
1449 * Enable channel per domain
1450 * Returns size of returned session payload data or a negative error code.
1452 int lttng_enable_channel(struct lttng_handle
*handle
,
1453 struct lttng_channel
*in_chan
)
1455 enum lttng_error_code ret_code
;
1457 struct lttng_dynamic_buffer buffer
;
1458 struct lttcomm_session_msg lsm
;
1459 uint64_t total_buffer_size_needed_per_cpu
= 0;
1460 struct lttng_channel
*channel
= NULL
;
1462 lttng_dynamic_buffer_init(&buffer
);
1464 /* NULL arguments are forbidden. No default values. */
1465 if (handle
== NULL
|| in_chan
== NULL
) {
1466 ret
= -LTTNG_ERR_INVALID
;
1471 * Verify that the amount of memory required to create the requested
1472 * buffer is available on the system at the moment.
1474 if (in_chan
->attr
.num_subbuf
>
1475 UINT64_MAX
/ in_chan
->attr
.subbuf_size
) {
1477 ret
= -LTTNG_ERR_OVERFLOW
;
1481 total_buffer_size_needed_per_cpu
=
1482 in_chan
->attr
.num_subbuf
* in_chan
->attr
.subbuf_size
;
1483 ret_code
= check_enough_available_memory(
1484 total_buffer_size_needed_per_cpu
);
1485 if (ret_code
!= LTTNG_OK
) {
1490 /* Copy the channel for easier manipulation. */
1491 channel
= lttng_channel_copy(in_chan
);
1493 ret
= -LTTNG_ERR_NOMEM
;
1497 /* Populate the channel extended attribute if necessary. */
1498 if (!channel
->attr
.extended
.ptr
) {
1499 struct lttng_channel_extended
*extended
=
1500 zmalloc(sizeof(*extended
));
1503 ret
= -LTTNG_ERR_NOMEM
;
1506 lttng_channel_set_default_extended_attr(
1507 &handle
->domain
, extended
);
1508 channel
->attr
.extended
.ptr
= extended
;
1511 /* Prepare the payload */
1512 memset(&lsm
, 0, sizeof(lsm
));
1514 lsm
.cmd_type
= LTTNG_ENABLE_CHANNEL
;
1515 COPY_DOMAIN_PACKED(lsm
.domain
, handle
->domain
);
1517 ret
= lttng_strncpy(lsm
.session
.name
, handle
->session_name
,
1518 sizeof(lsm
.session
.name
));
1520 ret
= -LTTNG_ERR_INVALID
;
1524 ret
= lttng_channel_serialize(channel
, &buffer
);
1526 ret
= -LTTNG_ERR_FATAL
;
1530 lsm
.u
.channel
.length
= buffer
.size
;
1532 ret
= lttng_ctl_ask_sessiond_varlen_no_cmd_header(
1533 &lsm
, buffer
.data
, buffer
.size
, NULL
);
1535 lttng_channel_destroy(channel
);
1536 lttng_dynamic_buffer_reset(&buffer
);
1541 * All tracing will be stopped for registered events of the channel.
1542 * Returns size of returned session payload data or a negative error code.
1544 int lttng_disable_channel(struct lttng_handle
*handle
, const char *name
)
1547 struct lttcomm_session_msg lsm
;
1549 /* Safety check. Both are mandatory. */
1550 if (handle
== NULL
|| name
== NULL
) {
1551 return -LTTNG_ERR_INVALID
;
1554 memset(&lsm
, 0, sizeof(lsm
));
1556 lsm
.cmd_type
= LTTNG_DISABLE_CHANNEL
;
1558 ret
= lttng_strncpy(lsm
.u
.disable
.channel_name
, name
,
1559 sizeof(lsm
.u
.disable
.channel_name
));
1561 ret
= -LTTNG_ERR_INVALID
;
1565 COPY_DOMAIN_PACKED(lsm
.domain
, handle
->domain
);
1567 ret
= lttng_strncpy(lsm
.session
.name
, handle
->session_name
,
1568 sizeof(lsm
.session
.name
));
1570 ret
= -LTTNG_ERR_INVALID
;
1574 ret
= lttng_ctl_ask_sessiond(&lsm
, NULL
);
1580 * Lists all available tracepoints of domain.
1581 * Sets the contents of the events array.
1582 * Returns the number of lttng_event entries in events;
1583 * on error, returns a negative value.
1585 int lttng_list_tracepoints(struct lttng_handle
*handle
,
1586 struct lttng_event
**events
)
1588 enum lttng_error_code ret_code
;
1589 int ret
, total_payload_received
;
1590 char *reception_buffer
= NULL
;
1591 struct lttcomm_session_msg lsm
;
1592 struct lttcomm_list_command_header
*cmd_header
= NULL
;
1593 size_t cmd_header_len
;
1594 unsigned int nb_events
= 0;
1596 if (handle
== NULL
) {
1597 ret
= -LTTNG_ERR_INVALID
;
1601 memset(&lsm
, 0, sizeof(lsm
));
1602 lsm
.cmd_type
= LTTNG_LIST_TRACEPOINTS
;
1603 COPY_DOMAIN_PACKED(lsm
.domain
, handle
->domain
);
1605 ret
= lttng_ctl_ask_sessiond_fds_varlen(&lsm
, NULL
, 0, NULL
, 0,
1606 (void **) &reception_buffer
, (void **) &cmd_header
,
1611 total_payload_received
= ret
;
1614 ret
= -LTTNG_ERR_UNK
;
1618 if (cmd_header
->count
> INT_MAX
) {
1619 ret
= -LTTNG_ERR_OVERFLOW
;
1623 nb_events
= (unsigned int) cmd_header
->count
;
1626 const struct lttng_buffer_view events_view
=
1627 lttng_buffer_view_init(reception_buffer
, 0,
1628 total_payload_received
);
1630 ret_code
= lttng_events_create_and_flatten_from_buffer(
1631 &events_view
, nb_events
, events
);
1632 if (ret_code
!= LTTNG_OK
) {
1638 ret
= (int) nb_events
;
1642 free(reception_buffer
);
1647 * Lists all available tracepoint fields of domain.
1648 * Sets the contents of the event field array.
1649 * Returns the number of lttng_event_field entries in events;
1650 * on error, returns a negative value.
1652 int lttng_list_tracepoint_fields(struct lttng_handle
*handle
,
1653 struct lttng_event_field
**fields
)
1655 enum lttng_error_code ret_code
;
1656 int ret
, total_payload_received
;
1657 struct lttcomm_session_msg lsm
;
1658 char *reception_buffer
= NULL
;
1659 struct lttcomm_list_command_header
*cmd_header
= NULL
;
1660 size_t cmd_header_len
;
1661 unsigned int nb_event_fields
= 0;
1663 if (handle
== NULL
) {
1664 return -LTTNG_ERR_INVALID
;
1667 memset(&lsm
, 0, sizeof(lsm
));
1668 lsm
.cmd_type
= LTTNG_LIST_TRACEPOINT_FIELDS
;
1669 COPY_DOMAIN_PACKED(lsm
.domain
, handle
->domain
);
1671 ret
= lttng_ctl_ask_sessiond_fds_varlen(&lsm
, NULL
, 0, NULL
, 0,
1672 (void **) &reception_buffer
, (void **) &cmd_header
,
1678 total_payload_received
= ret
;
1681 ret
= -LTTNG_ERR_UNK
;
1685 if (cmd_header
->count
> INT_MAX
) {
1686 ret
= -LTTNG_ERR_OVERFLOW
;
1690 nb_event_fields
= cmd_header
->count
;
1693 const struct lttng_buffer_view view
=
1694 lttng_buffer_view_init(reception_buffer
, 0, total_payload_received
);
1696 ret_code
= lttng_event_fields_create_and_flatten_from_buffer(
1697 &view
, nb_event_fields
, fields
);
1698 if (ret_code
!= LTTNG_OK
) {
1704 ret
= nb_event_fields
;
1708 free(reception_buffer
);
1713 * Lists all available kernel system calls. Allocates and sets the contents of
1716 * Returns the number of lttng_event entries in events; on error, returns a
1719 int lttng_list_syscalls(struct lttng_event
**events
)
1721 enum lttng_error_code ret_code
;
1722 int ret
, total_payload_received
;
1723 char *reception_buffer
= NULL
;
1724 struct lttcomm_session_msg lsm
;
1725 struct lttcomm_list_command_header
*cmd_header
= NULL
;
1726 size_t cmd_header_len
;
1727 uint32_t nb_events
= 0;
1730 ret
= -LTTNG_ERR_INVALID
;
1734 memset(&lsm
, 0, sizeof(lsm
));
1735 lsm
.cmd_type
= LTTNG_LIST_SYSCALLS
;
1736 /* Force kernel domain for system calls. */
1737 lsm
.domain
.type
= LTTNG_DOMAIN_KERNEL
;
1739 ret
= lttng_ctl_ask_sessiond_fds_varlen(&lsm
, NULL
, 0, NULL
, 0,
1740 (void **) &reception_buffer
, (void **) &cmd_header
,
1745 total_payload_received
= ret
;
1748 ret
= -LTTNG_ERR_UNK
;
1752 if (cmd_header
->count
> INT_MAX
) {
1753 ret
= -LTTNG_ERR_OVERFLOW
;
1757 nb_events
= (unsigned int) cmd_header
->count
;
1760 const struct lttng_buffer_view events_view
=
1761 lttng_buffer_view_init(reception_buffer
, 0,
1762 total_payload_received
);
1764 ret_code
= lttng_events_create_and_flatten_from_buffer(
1765 &events_view
, nb_events
, events
);
1766 if (ret_code
!= LTTNG_OK
) {
1772 ret
= (int) nb_events
;
1775 free(reception_buffer
);
1781 * Returns a human readable string describing
1782 * the error code (a negative value).
1784 const char *lttng_strerror(int code
)
1786 return error_get_str(code
);
1789 enum lttng_error_code
lttng_create_session_ext(
1790 struct lttng_session_descriptor
*session_descriptor
)
1792 enum lttng_error_code ret_code
;
1793 struct lttcomm_session_msg lsm
= {
1794 .cmd_type
= LTTNG_CREATE_SESSION_EXT
,
1797 struct lttng_buffer_view reply_view
;
1799 bool sessiond_must_generate_ouput
;
1800 struct lttng_dynamic_buffer payload
;
1802 size_t descriptor_size
;
1803 struct lttng_session_descriptor
*descriptor_reply
= NULL
;
1805 lttng_dynamic_buffer_init(&payload
);
1806 if (!session_descriptor
) {
1807 ret_code
= LTTNG_ERR_INVALID
;
1811 sessiond_must_generate_ouput
=
1812 !lttng_session_descriptor_is_output_destination_initialized(
1813 session_descriptor
);
1814 if (sessiond_must_generate_ouput
) {
1815 const char *home_dir
= utils_get_home_dir();
1816 size_t home_dir_len
= home_dir
? strlen(home_dir
) + 1 : 0;
1818 if (!home_dir
|| home_dir_len
> LTTNG_PATH_MAX
) {
1819 ret_code
= LTTNG_ERR_FATAL
;
1823 lsm
.u
.create_session
.home_dir_size
= (uint16_t) home_dir_len
;
1824 ret
= lttng_dynamic_buffer_append(&payload
, home_dir
,
1827 ret_code
= LTTNG_ERR_NOMEM
;
1832 descriptor_size
= payload
.size
;
1833 ret
= lttng_session_descriptor_serialize(session_descriptor
,
1836 ret_code
= LTTNG_ERR_INVALID
;
1839 descriptor_size
= payload
.size
- descriptor_size
;
1840 lsm
.u
.create_session
.session_descriptor_size
= descriptor_size
;
1842 /* Command returns a session descriptor on success. */
1843 reply_ret
= lttng_ctl_ask_sessiond_varlen_no_cmd_header(&lsm
, payload
.data
,
1844 payload
.size
, &reply
);
1845 if (reply_ret
< 0) {
1846 ret_code
= -reply_ret
;
1848 } else if (reply_ret
== 0) {
1849 /* Socket unexpectedly closed by the session daemon. */
1850 ret_code
= LTTNG_ERR_FATAL
;
1854 reply_view
= lttng_buffer_view_init(reply
, 0, reply_ret
);
1855 ret
= lttng_session_descriptor_create_from_buffer(&reply_view
,
1858 ret_code
= LTTNG_ERR_FATAL
;
1861 ret_code
= LTTNG_OK
;
1862 lttng_session_descriptor_assign(session_descriptor
, descriptor_reply
);
1865 lttng_dynamic_buffer_reset(&payload
);
1866 lttng_session_descriptor_destroy(descriptor_reply
);
1871 * Create a new session using name and url for destination.
1873 * Return 0 on success else a negative LTTng error code.
1875 int lttng_create_session(const char *name
, const char *url
)
1879 struct lttng_uri
*uris
= NULL
;
1880 struct lttng_session_descriptor
*descriptor
= NULL
;
1881 enum lttng_error_code ret_code
;
1884 ret
= -LTTNG_ERR_INVALID
;
1888 size
= uri_parse_str_urls(url
, NULL
, &uris
);
1890 ret
= -LTTNG_ERR_INVALID
;
1895 descriptor
= lttng_session_descriptor_create(name
);
1898 if (uris
[0].dtype
!= LTTNG_DST_PATH
) {
1899 ret
= -LTTNG_ERR_INVALID
;
1902 descriptor
= lttng_session_descriptor_local_create(name
,
1906 descriptor
= lttng_session_descriptor_network_create(name
, url
,
1910 ret
= -LTTNG_ERR_INVALID
;
1914 ret
= -LTTNG_ERR_INVALID
;
1917 ret_code
= lttng_create_session_ext(descriptor
);
1918 ret
= ret_code
== LTTNG_OK
? 0 : -ret_code
;
1920 lttng_session_descriptor_destroy(descriptor
);
1926 * Create a session exclusively used for snapshot.
1928 * Return 0 on success else a negative LTTng error code.
1930 int lttng_create_session_snapshot(const char *name
, const char *snapshot_url
)
1933 enum lttng_error_code ret_code
;
1935 struct lttng_uri
*uris
= NULL
;
1936 struct lttng_session_descriptor
*descriptor
= NULL
;
1939 ret
= -LTTNG_ERR_INVALID
;
1943 size
= uri_parse_str_urls(snapshot_url
, NULL
, &uris
);
1945 ret
= -LTTNG_ERR_INVALID
;
1949 * If the user does not specify a custom subdir, use the session name.
1951 if (size
> 0 && uris
[0].dtype
!= LTTNG_DST_PATH
&&
1952 strlen(uris
[0].subdir
) == 0) {
1953 ret
= snprintf(uris
[0].subdir
, sizeof(uris
[0].subdir
), "%s",
1956 PERROR("Failed to set session name as network destination sub-directory");
1957 ret
= -LTTNG_ERR_FATAL
;
1959 } else if (ret
>= sizeof(uris
[0].subdir
)) {
1960 /* Truncated output. */
1961 ret
= -LTTNG_ERR_INVALID
;
1968 descriptor
= lttng_session_descriptor_snapshot_create(name
);
1971 if (uris
[0].dtype
!= LTTNG_DST_PATH
) {
1972 ret
= -LTTNG_ERR_INVALID
;
1975 descriptor
= lttng_session_descriptor_snapshot_local_create(
1980 descriptor
= lttng_session_descriptor_snapshot_network_create(
1986 ret
= -LTTNG_ERR_INVALID
;
1990 ret
= -LTTNG_ERR_INVALID
;
1993 ret_code
= lttng_create_session_ext(descriptor
);
1994 ret
= ret_code
== LTTNG_OK
? 0 : -ret_code
;
1996 lttng_session_descriptor_destroy(descriptor
);
2002 * Create a session exclusively used for live.
2004 * Return 0 on success else a negative LTTng error code.
2006 int lttng_create_session_live(const char *name
, const char *url
,
2007 unsigned int timer_interval
)
2010 enum lttng_error_code ret_code
;
2011 struct lttng_session_descriptor
*descriptor
= NULL
;
2014 ret
= -LTTNG_ERR_INVALID
;
2019 descriptor
= lttng_session_descriptor_live_network_create(
2020 name
, url
, NULL
, timer_interval
);
2022 descriptor
= lttng_session_descriptor_live_create(
2023 name
, timer_interval
);
2026 ret
= -LTTNG_ERR_INVALID
;
2029 ret_code
= lttng_create_session_ext(descriptor
);
2030 ret
= ret_code
== LTTNG_OK
? 0 : -ret_code
;
2032 lttng_session_descriptor_destroy(descriptor
);
2037 * Stop the session and wait for the data before destroying it
2039 * Return 0 on success else a negative LTTng error code.
2041 int lttng_destroy_session(const char *session_name
)
2044 enum lttng_error_code ret_code
;
2045 enum lttng_destruction_handle_status status
;
2046 struct lttng_destruction_handle
*handle
= NULL
;
2049 * Stop the tracing and wait for the data to be
2052 ret
= _lttng_stop_tracing(session_name
, 1);
2053 if (ret
&& ret
!= -LTTNG_ERR_TRACE_ALREADY_STOPPED
) {
2057 ret_code
= lttng_destroy_session_ext(session_name
, &handle
);
2058 if (ret_code
!= LTTNG_OK
) {
2059 ret
= (int) -ret_code
;
2064 /* Block until the completion of the destruction of the session. */
2065 status
= lttng_destruction_handle_wait_for_completion(handle
, -1);
2066 if (status
!= LTTNG_DESTRUCTION_HANDLE_STATUS_COMPLETED
) {
2067 ret
= -LTTNG_ERR_UNK
;
2071 status
= lttng_destruction_handle_get_result(handle
, &ret_code
);
2072 if (status
!= LTTNG_DESTRUCTION_HANDLE_STATUS_OK
) {
2073 ret
= -LTTNG_ERR_UNK
;
2076 ret
= ret_code
== LTTNG_OK
? 0 : -ret_code
;
2078 lttng_destruction_handle_destroy(handle
);
2083 * Destroy the session without waiting for the data.
2085 int lttng_destroy_session_no_wait(const char *session_name
)
2087 enum lttng_error_code ret_code
;
2089 ret_code
= lttng_destroy_session_ext(session_name
, NULL
);
2090 return ret_code
== LTTNG_OK
? 0 : -ret_code
;
2094 * Ask the session daemon for all available sessions.
2095 * Sets the contents of the sessions array.
2096 * Returns the number of lttng_session entries in sessions;
2097 * on error, returns a negative value.
2099 int lttng_list_sessions(struct lttng_session
**out_sessions
)
2102 struct lttcomm_session_msg lsm
;
2103 const size_t session_size
= sizeof(struct lttng_session
) +
2104 sizeof(struct lttng_session_extended
);
2105 size_t session_count
, i
;
2106 struct lttng_session_extended
*sessions_extended_begin
;
2107 struct lttng_session
*sessions
= NULL
;
2109 memset(&lsm
, 0, sizeof(lsm
));
2110 lsm
.cmd_type
= LTTNG_LIST_SESSIONS
;
2112 * Initialize out_sessions to NULL so it is initialized when
2113 * lttng_list_sessions returns 0, thus allowing *out_sessions to
2114 * be subsequently freed.
2116 *out_sessions
= NULL
;
2117 ret
= lttng_ctl_ask_sessiond(&lsm
, (void**) &sessions
);
2122 ret
= -LTTNG_ERR_FATAL
;
2126 if (ret
% session_size
) {
2127 ret
= -LTTNG_ERR_UNK
;
2131 session_count
= (size_t) ret
/ session_size
;
2132 sessions_extended_begin
= (struct lttng_session_extended
*)
2133 (&sessions
[session_count
]);
2135 /* Set extended session info pointers. */
2136 for (i
= 0; i
< session_count
; i
++) {
2137 struct lttng_session
*session
= &sessions
[i
];
2138 struct lttng_session_extended
*extended
=
2139 &(sessions_extended_begin
[i
]);
2141 session
->extended
.ptr
= extended
;
2144 ret
= (int) session_count
;
2145 *out_sessions
= sessions
;
2150 enum lttng_error_code
lttng_session_get_creation_time(
2151 const struct lttng_session
*session
, uint64_t *creation_time
)
2153 enum lttng_error_code ret
= LTTNG_OK
;
2154 struct lttng_session_extended
*extended
;
2156 if (!session
|| !creation_time
|| !session
->extended
.ptr
) {
2157 ret
= LTTNG_ERR_INVALID
;
2161 extended
= session
->extended
.ptr
;
2162 if (!extended
->creation_time
.is_set
) {
2163 /* Not created on the session daemon yet. */
2164 ret
= LTTNG_ERR_SESSION_NOT_EXIST
;
2167 *creation_time
= extended
->creation_time
.value
;
2172 int lttng_set_session_shm_path(const char *session_name
,
2173 const char *shm_path
)
2176 struct lttcomm_session_msg lsm
;
2178 if (session_name
== NULL
) {
2179 return -LTTNG_ERR_INVALID
;
2182 memset(&lsm
, 0, sizeof(lsm
));
2183 lsm
.cmd_type
= LTTNG_SET_SESSION_SHM_PATH
;
2185 ret
= lttng_strncpy(lsm
.session
.name
, session_name
,
2186 sizeof(lsm
.session
.name
));
2188 ret
= -LTTNG_ERR_INVALID
;
2192 ret
= lttng_strncpy(lsm
.u
.set_shm_path
.shm_path
, shm_path
?: "",
2193 sizeof(lsm
.u
.set_shm_path
.shm_path
));
2195 ret
= -LTTNG_ERR_INVALID
;
2199 ret
= lttng_ctl_ask_sessiond(&lsm
, NULL
);
2205 * Ask the session daemon for all available domains of a session.
2206 * Sets the contents of the domains array.
2207 * Returns the number of lttng_domain entries in domains;
2208 * on error, returns a negative value.
2210 int lttng_list_domains(const char *session_name
,
2211 struct lttng_domain
**domains
)
2214 struct lttcomm_session_msg lsm
;
2216 if (session_name
== NULL
) {
2217 ret
= -LTTNG_ERR_INVALID
;
2221 memset(&lsm
, 0, sizeof(lsm
));
2222 lsm
.cmd_type
= LTTNG_LIST_DOMAINS
;
2224 ret
= lttng_strncpy(lsm
.session
.name
, session_name
,
2225 sizeof(lsm
.session
.name
));
2227 ret
= -LTTNG_ERR_INVALID
;
2231 ret
= lttng_ctl_ask_sessiond(&lsm
, (void**) domains
);
2236 return ret
/ sizeof(struct lttng_domain
);
2242 * Ask the session daemon for all available channels of a session.
2243 * Sets the contents of the channels array.
2244 * Returns the number of lttng_channel entries in channels;
2245 * on error, returns a negative value.
2247 int lttng_list_channels(struct lttng_handle
*handle
,
2248 struct lttng_channel
**channels
)
2250 int ret
, total_payload_received
;
2251 struct lttcomm_session_msg lsm
;
2252 char *reception_buffer
= NULL
;
2253 size_t cmd_header_len
= 0;
2254 struct lttcomm_list_command_header
*cmd_header
= NULL
;
2255 struct lttng_dynamic_buffer tmp_buffer
;
2257 lttng_dynamic_buffer_init(&tmp_buffer
);
2259 if (handle
== NULL
) {
2260 ret
= -LTTNG_ERR_INVALID
;
2264 memset(&lsm
, 0, sizeof(lsm
));
2265 lsm
.cmd_type
= LTTNG_LIST_CHANNELS
;
2266 ret
= lttng_strncpy(lsm
.session
.name
, handle
->session_name
,
2267 sizeof(lsm
.session
.name
));
2269 ret
= -LTTNG_ERR_INVALID
;
2273 COPY_DOMAIN_PACKED(lsm
.domain
, handle
->domain
);
2275 ret
= lttng_ctl_ask_sessiond_fds_varlen(&lsm
, NULL
, 0, NULL
, 0,
2276 (void **) &reception_buffer
, (void **) &cmd_header
,
2282 total_payload_received
= ret
;
2284 if (cmd_header_len
!= sizeof(*cmd_header
)) {
2285 ret
= -LTTNG_ERR_FATAL
;
2290 ret
= LTTNG_ERR_UNK
;
2294 if (cmd_header
->count
> INT_MAX
) {
2295 ret
= -LTTNG_ERR_OVERFLOW
;
2300 enum lttng_error_code ret_code
;
2301 const struct lttng_buffer_view events_view
=
2302 lttng_buffer_view_init(reception_buffer
, 0,
2303 total_payload_received
);
2305 ret_code
= lttng_channels_create_and_flatten_from_buffer(
2306 &events_view
, cmd_header
->count
, channels
);
2307 if (ret_code
!= LTTNG_OK
) {
2313 ret
= (int) cmd_header
->count
;
2316 free(reception_buffer
);
2321 * Ask the session daemon for all available events of a session channel.
2322 * Sets the contents of the events array.
2323 * Returns the number of lttng_event entries in events;
2324 * on error, returns a negative value.
2326 int lttng_list_events(struct lttng_handle
*handle
,
2327 const char *channel_name
, struct lttng_event
**events
)
2329 enum lttng_error_code ret_code
;
2331 struct lttcomm_session_msg lsm
;
2332 struct lttcomm_list_command_header
*cmd_header
= NULL
;
2333 size_t cmd_header_len
;
2334 unsigned int nb_events
;
2335 char *reception_buffer
= NULL
;
2336 struct lttng_dynamic_buffer tmp_buffer
;
2337 ssize_t total_payload_received
;
2339 lttng_dynamic_buffer_init(&tmp_buffer
);
2341 /* Safety check. An handle and channel name are mandatory */
2342 if (handle
== NULL
|| channel_name
== NULL
) {
2343 return -LTTNG_ERR_INVALID
;
2346 memset(&lsm
, 0, sizeof(lsm
));
2347 lsm
.cmd_type
= LTTNG_LIST_EVENTS
;
2348 ret
= lttng_strncpy(lsm
.session
.name
, handle
->session_name
,
2349 sizeof(lsm
.session
.name
));
2351 ret
= -LTTNG_ERR_INVALID
;
2355 ret
= lttng_strncpy(lsm
.u
.list
.channel_name
, channel_name
,
2356 sizeof(lsm
.u
.list
.channel_name
));
2358 ret
= -LTTNG_ERR_INVALID
;
2362 COPY_DOMAIN_PACKED(lsm
.domain
, handle
->domain
);
2364 ret
= lttng_ctl_ask_sessiond_fds_varlen(&lsm
, NULL
, 0, NULL
, 0,
2365 (void **) &reception_buffer
, (void **) &cmd_header
,
2371 total_payload_received
= ret
;
2374 ret
= -LTTNG_ERR_UNK
;
2378 if (cmd_header
->count
> INT_MAX
) {
2379 ret
= -LTTNG_ERR_OVERFLOW
;
2383 nb_events
= (unsigned int) cmd_header
->count
;
2386 const struct lttng_buffer_view events_view
=
2387 lttng_buffer_view_init(reception_buffer
, 0,
2388 total_payload_received
);
2389 ret_code
= lttng_events_create_and_flatten_from_buffer(
2390 &events_view
, nb_events
, events
);
2391 if (ret_code
!= LTTNG_OK
) {
2397 ret
= (int) nb_events
;
2400 free(reception_buffer
);
2405 * Sets the tracing_group variable with name.
2406 * This function allocates memory pointed to by tracing_group.
2407 * On success, returns 0, on error, returns -1 (null name) or -ENOMEM.
2409 int lttng_set_tracing_group(const char *name
)
2413 return -LTTNG_ERR_INVALID
;
2416 if (asprintf(&new_group
, "%s", name
) < 0) {
2417 return -LTTNG_ERR_FATAL
;
2420 free(tracing_group
);
2421 tracing_group
= new_group
;
2427 int lttng_calibrate(struct lttng_handle
*handle
,
2428 struct lttng_calibrate
*calibrate
)
2431 * This command was removed in LTTng 2.9.
2433 return -LTTNG_ERR_UND
;
2437 * Set default channel attributes.
2438 * If either or both of the arguments are null, attr content is zeroe'd.
2440 void lttng_channel_set_default_attr(struct lttng_domain
*domain
,
2441 struct lttng_channel_attr
*attr
)
2443 struct lttng_channel_extended
*extended
;
2446 if (attr
== NULL
|| domain
== NULL
) {
2450 /* Save the pointer for later use */
2451 extended
= (struct lttng_channel_extended
*) attr
->extended
.ptr
;
2452 memset(attr
, 0, sizeof(struct lttng_channel_attr
));
2454 /* Same for all domains. */
2455 attr
->overwrite
= DEFAULT_CHANNEL_OVERWRITE
;
2456 attr
->tracefile_size
= DEFAULT_CHANNEL_TRACEFILE_SIZE
;
2457 attr
->tracefile_count
= DEFAULT_CHANNEL_TRACEFILE_COUNT
;
2459 switch (domain
->type
) {
2460 case LTTNG_DOMAIN_KERNEL
:
2461 attr
->switch_timer_interval
=
2462 DEFAULT_KERNEL_CHANNEL_SWITCH_TIMER
;
2463 attr
->read_timer_interval
= DEFAULT_KERNEL_CHANNEL_READ_TIMER
;
2464 attr
->subbuf_size
= default_get_kernel_channel_subbuf_size();
2465 attr
->num_subbuf
= DEFAULT_KERNEL_CHANNEL_SUBBUF_NUM
;
2466 attr
->output
= DEFAULT_KERNEL_CHANNEL_OUTPUT
;
2468 case LTTNG_DOMAIN_UST
:
2469 switch (domain
->buf_type
) {
2470 case LTTNG_BUFFER_PER_UID
:
2471 attr
->subbuf_size
= default_get_ust_uid_channel_subbuf_size();
2472 attr
->num_subbuf
= DEFAULT_UST_UID_CHANNEL_SUBBUF_NUM
;
2473 attr
->output
= DEFAULT_UST_UID_CHANNEL_OUTPUT
;
2474 attr
->switch_timer_interval
=
2475 DEFAULT_UST_UID_CHANNEL_SWITCH_TIMER
;
2476 attr
->read_timer_interval
=
2477 DEFAULT_UST_UID_CHANNEL_READ_TIMER
;
2479 case LTTNG_BUFFER_PER_PID
:
2481 attr
->subbuf_size
= default_get_ust_pid_channel_subbuf_size();
2482 attr
->num_subbuf
= DEFAULT_UST_PID_CHANNEL_SUBBUF_NUM
;
2483 attr
->output
= DEFAULT_UST_PID_CHANNEL_OUTPUT
;
2484 attr
->switch_timer_interval
=
2485 DEFAULT_UST_PID_CHANNEL_SWITCH_TIMER
;
2486 attr
->read_timer_interval
=
2487 DEFAULT_UST_PID_CHANNEL_READ_TIMER
;
2491 /* Default behavior: leave set to 0. */
2496 lttng_channel_set_default_extended_attr(domain
, extended
);
2499 /* Reassign the extended pointer. */
2500 attr
->extended
.ptr
= extended
;
2503 int lttng_channel_get_discarded_event_count(struct lttng_channel
*channel
,
2504 uint64_t *discarded_events
)
2507 struct lttng_channel_extended
*chan_ext
;
2509 if (!channel
|| !discarded_events
) {
2510 ret
= -LTTNG_ERR_INVALID
;
2514 chan_ext
= channel
->attr
.extended
.ptr
;
2517 * This can happen since the lttng_channel structure is
2518 * used for other tasks where this pointer is never set.
2520 *discarded_events
= 0;
2524 *discarded_events
= chan_ext
->discarded_events
;
2529 int lttng_channel_get_lost_packet_count(struct lttng_channel
*channel
,
2530 uint64_t *lost_packets
)
2533 struct lttng_channel_extended
*chan_ext
;
2535 if (!channel
|| !lost_packets
) {
2536 ret
= -LTTNG_ERR_INVALID
;
2540 chan_ext
= channel
->attr
.extended
.ptr
;
2543 * This can happen since the lttng_channel structure is
2544 * used for other tasks where this pointer is never set.
2550 *lost_packets
= chan_ext
->lost_packets
;
2555 int lttng_channel_get_monitor_timer_interval(struct lttng_channel
*chan
,
2556 uint64_t *monitor_timer_interval
)
2560 if (!chan
|| !monitor_timer_interval
) {
2561 ret
= -LTTNG_ERR_INVALID
;
2565 if (!chan
->attr
.extended
.ptr
) {
2566 ret
= -LTTNG_ERR_INVALID
;
2570 *monitor_timer_interval
= ((struct lttng_channel_extended
*)
2571 chan
->attr
.extended
.ptr
)->monitor_timer_interval
;
2576 int lttng_channel_set_monitor_timer_interval(struct lttng_channel
*chan
,
2577 uint64_t monitor_timer_interval
)
2581 if (!chan
|| !chan
->attr
.extended
.ptr
) {
2582 ret
= -LTTNG_ERR_INVALID
;
2586 ((struct lttng_channel_extended
*)
2587 chan
->attr
.extended
.ptr
)->monitor_timer_interval
=
2588 monitor_timer_interval
;
2593 int lttng_channel_get_blocking_timeout(struct lttng_channel
*chan
,
2594 int64_t *blocking_timeout
)
2598 if (!chan
|| !blocking_timeout
) {
2599 ret
= -LTTNG_ERR_INVALID
;
2603 if (!chan
->attr
.extended
.ptr
) {
2604 ret
= -LTTNG_ERR_INVALID
;
2608 *blocking_timeout
= ((struct lttng_channel_extended
*)
2609 chan
->attr
.extended
.ptr
)->blocking_timeout
;
2614 int lttng_channel_set_blocking_timeout(struct lttng_channel
*chan
,
2615 int64_t blocking_timeout
)
2618 int64_t msec_timeout
;
2620 if (!chan
|| !chan
->attr
.extended
.ptr
) {
2621 ret
= -LTTNG_ERR_INVALID
;
2625 if (blocking_timeout
< 0 && blocking_timeout
!= -1) {
2626 ret
= -LTTNG_ERR_INVALID
;
2631 * LTTng-ust's use of poll() to implement this timeout mechanism forces
2632 * us to accept a narrower range of values (msecs expressed as a signed
2635 msec_timeout
= blocking_timeout
/ 1000;
2636 if (msec_timeout
!= (int32_t) msec_timeout
) {
2637 ret
= -LTTNG_ERR_INVALID
;
2641 ((struct lttng_channel_extended
*)
2642 chan
->attr
.extended
.ptr
)->blocking_timeout
=
2649 * Check if session daemon is alive.
2651 * Return 1 if alive or 0 if not.
2652 * On error returns a negative value.
2654 int lttng_session_daemon_alive(void)
2658 ret
= set_session_daemon_path();
2664 if (*sessiond_sock_path
== '\0') {
2666 * No socket path set. Weird error which means the constructor
2672 ret
= try_connect_sessiond(sessiond_sock_path
);
2683 * Set URL for a consumer for a session and domain.
2685 * Return 0 on success, else a negative value.
2687 int lttng_set_consumer_url(struct lttng_handle
*handle
,
2688 const char *control_url
, const char *data_url
)
2692 struct lttcomm_session_msg lsm
;
2693 struct lttng_uri
*uris
= NULL
;
2695 if (handle
== NULL
|| (control_url
== NULL
&& data_url
== NULL
)) {
2696 ret
= -LTTNG_ERR_INVALID
;
2700 memset(&lsm
, 0, sizeof(lsm
));
2702 lsm
.cmd_type
= LTTNG_SET_CONSUMER_URI
;
2704 ret
= lttng_strncpy(lsm
.session
.name
, handle
->session_name
,
2705 sizeof(lsm
.session
.name
));
2707 ret
= -LTTNG_ERR_INVALID
;
2711 COPY_DOMAIN_PACKED(lsm
.domain
, handle
->domain
);
2713 size
= uri_parse_str_urls(control_url
, data_url
, &uris
);
2715 ret
= -LTTNG_ERR_INVALID
;
2719 lsm
.u
.uri
.size
= size
;
2721 ret
= lttng_ctl_ask_sessiond_varlen_no_cmd_header(&lsm
, uris
,
2722 sizeof(struct lttng_uri
) * size
, NULL
);
2732 int lttng_enable_consumer(struct lttng_handle
*handle
);
2733 int lttng_enable_consumer(struct lttng_handle
*handle
)
2741 int lttng_disable_consumer(struct lttng_handle
*handle
);
2742 int lttng_disable_consumer(struct lttng_handle
*handle
)
2750 int _lttng_create_session_ext(const char *name
, const char *url
,
2751 const char *datetime
);
2752 int _lttng_create_session_ext(const char *name
, const char *url
,
2753 const char *datetime
)
2759 * For a given session name, this call checks if the data is ready to be read
2760 * or is still being extracted by the consumer(s) hence not ready to be used by
2763 int lttng_data_pending(const char *session_name
)
2766 struct lttcomm_session_msg lsm
;
2767 uint8_t *pending
= NULL
;
2769 if (session_name
== NULL
) {
2770 return -LTTNG_ERR_INVALID
;
2773 memset(&lsm
, 0, sizeof(lsm
));
2774 lsm
.cmd_type
= LTTNG_DATA_PENDING
;
2776 ret
= lttng_strncpy(lsm
.session
.name
, session_name
,
2777 sizeof(lsm
.session
.name
));
2779 ret
= -LTTNG_ERR_INVALID
;
2783 ret
= lttng_ctl_ask_sessiond(&lsm
, (void **) &pending
);
2786 } else if (ret
!= 1) {
2787 /* Unexpected payload size */
2788 ret
= -LTTNG_ERR_INVALID
;
2790 } else if (!pending
) {
2791 /* Internal error. */
2792 ret
= -LTTNG_ERR_UNK
;
2796 ret
= (int) *pending
;
2803 * Regenerate the metadata for a session.
2804 * Return 0 on success, a negative error code on error.
2806 int lttng_regenerate_metadata(const char *session_name
)
2809 struct lttcomm_session_msg lsm
;
2811 if (!session_name
) {
2812 ret
= -LTTNG_ERR_INVALID
;
2816 memset(&lsm
, 0, sizeof(lsm
));
2817 lsm
.cmd_type
= LTTNG_REGENERATE_METADATA
;
2819 ret
= lttng_strncpy(lsm
.session
.name
, session_name
,
2820 sizeof(lsm
.session
.name
));
2822 ret
= -LTTNG_ERR_INVALID
;
2826 ret
= lttng_ctl_ask_sessiond(&lsm
, NULL
);
2837 * Deprecated, replaced by lttng_regenerate_metadata.
2839 int lttng_metadata_regenerate(const char *session_name
)
2841 return lttng_regenerate_metadata(session_name
);
2845 * Regenerate the statedump of a session.
2846 * Return 0 on success, a negative error code on error.
2848 int lttng_regenerate_statedump(const char *session_name
)
2851 struct lttcomm_session_msg lsm
;
2853 if (!session_name
) {
2854 ret
= -LTTNG_ERR_INVALID
;
2858 memset(&lsm
, 0, sizeof(lsm
));
2859 lsm
.cmd_type
= LTTNG_REGENERATE_STATEDUMP
;
2861 ret
= lttng_strncpy(lsm
.session
.name
, session_name
,
2862 sizeof(lsm
.session
.name
));
2864 ret
= -LTTNG_ERR_INVALID
;
2868 ret
= lttng_ctl_ask_sessiond(&lsm
, NULL
);
2878 int lttng_register_trigger(struct lttng_trigger
*trigger
)
2881 struct lttcomm_session_msg lsm
;
2882 struct lttng_dynamic_buffer buffer
;
2884 lttng_dynamic_buffer_init(&buffer
);
2886 ret
= -LTTNG_ERR_INVALID
;
2890 if (!lttng_trigger_validate(trigger
)) {
2891 ret
= -LTTNG_ERR_INVALID_TRIGGER
;
2895 ret
= lttng_trigger_serialize(trigger
, &buffer
);
2897 ret
= -LTTNG_ERR_UNK
;
2901 memset(&lsm
, 0, sizeof(lsm
));
2902 lsm
.cmd_type
= LTTNG_REGISTER_TRIGGER
;
2903 lsm
.u
.trigger
.length
= (uint32_t) buffer
.size
;
2904 ret
= lttng_ctl_ask_sessiond_varlen_no_cmd_header(&lsm
, buffer
.data
,
2907 lttng_dynamic_buffer_reset(&buffer
);
2911 int lttng_unregister_trigger(struct lttng_trigger
*trigger
)
2914 struct lttcomm_session_msg lsm
;
2915 struct lttng_dynamic_buffer buffer
;
2917 lttng_dynamic_buffer_init(&buffer
);
2919 ret
= -LTTNG_ERR_INVALID
;
2923 if (!lttng_trigger_validate(trigger
)) {
2924 ret
= -LTTNG_ERR_INVALID_TRIGGER
;
2928 ret
= lttng_trigger_serialize(trigger
, &buffer
);
2930 ret
= -LTTNG_ERR_UNK
;
2934 memset(&lsm
, 0, sizeof(lsm
));
2935 lsm
.cmd_type
= LTTNG_UNREGISTER_TRIGGER
;
2936 lsm
.u
.trigger
.length
= (uint32_t) buffer
.size
;
2937 ret
= lttng_ctl_ask_sessiond_varlen_no_cmd_header(&lsm
, buffer
.data
,
2940 lttng_dynamic_buffer_reset(&buffer
);
2947 static void __attribute__((constructor
)) init(void)
2949 /* Set default session group */
2950 lttng_set_tracing_group(DEFAULT_TRACING_GROUP
);
2956 static void __attribute__((destructor
)) lttng_ctl_exit(void)
2958 free(tracing_group
);