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/compat/string.h>
34 #include <common/defaults.h>
35 #include <common/sessiond-comm/sessiond-comm.h>
36 #include <common/uri.h>
37 #include <common/utils.h>
38 #include <common/dynamic-buffer.h>
39 #include <lttng/lttng.h>
40 #include <lttng/health-internal.h>
41 #include <lttng/trigger/trigger-internal.h>
42 #include <lttng/endpoint.h>
43 #include <lttng/channel-internal.h>
44 #include <lttng/event-internal.h>
45 #include <lttng/userspace-probe-internal.h>
47 #include "filter/filter-ast.h"
48 #include "filter/filter-parser.h"
49 #include "filter/filter-bytecode.h"
50 #include "filter/memstream.h"
51 #include "lttng-ctl-helper.h"
54 static const int print_xml
= 1;
55 #define dbg_printf(fmt, args...) \
56 printf("[debug liblttng-ctl] " fmt, ## args)
58 static const int print_xml
= 0;
59 #define dbg_printf(fmt, args...) \
61 /* do nothing but check printf format */ \
63 printf("[debug liblttnctl] " fmt, ## args); \
68 /* Socket to session daemon for communication */
69 static int sessiond_socket
;
70 static char sessiond_sock_path
[PATH_MAX
];
73 static char *tracing_group
;
79 * Those two variables are used by error.h to silent or control the verbosity of
80 * error message. They are global to the library so application linking with it
81 * are able to compile correctly and also control verbosity of the library.
84 int lttng_opt_verbose
;
88 * Copy string from src to dst and enforce null terminated byte.
91 void lttng_ctl_copy_string(char *dst
, const char *src
, size_t len
)
94 strncpy(dst
, src
, len
);
95 /* Enforce the NULL terminated byte */
103 * Copy domain to lttcomm_session_msg domain.
105 * If domain is unknown, default domain will be the kernel.
108 void lttng_ctl_copy_lttng_domain(struct lttng_domain
*dst
,
109 struct lttng_domain
*src
)
113 case LTTNG_DOMAIN_KERNEL
:
114 case LTTNG_DOMAIN_UST
:
115 case LTTNG_DOMAIN_JUL
:
116 case LTTNG_DOMAIN_LOG4J
:
117 case LTTNG_DOMAIN_PYTHON
:
118 memcpy(dst
, src
, sizeof(struct lttng_domain
));
121 memset(dst
, 0, sizeof(struct lttng_domain
));
128 * Send lttcomm_session_msg to the session daemon.
130 * On success, returns the number of bytes sent (>=0)
131 * On error, returns -1
133 static int send_session_msg(struct lttcomm_session_msg
*lsm
)
138 ret
= -LTTNG_ERR_NO_SESSIOND
;
142 DBG("LSM cmd type : %d", lsm
->cmd_type
);
144 ret
= lttcomm_send_creds_unix_sock(sessiond_socket
, lsm
,
145 sizeof(struct lttcomm_session_msg
));
147 ret
= -LTTNG_ERR_FATAL
;
155 * Send var len data to the session daemon.
157 * On success, returns the number of bytes sent (>=0)
158 * On error, returns -1
160 static int send_session_varlen(const void *data
, size_t len
)
165 ret
= -LTTNG_ERR_NO_SESSIOND
;
174 ret
= lttcomm_send_unix_sock(sessiond_socket
, data
, len
);
176 ret
= -LTTNG_ERR_FATAL
;
184 * Send file descriptors to the session daemon.
186 * On success, returns the number of bytes sent (>=0)
187 * On error, returns -1
189 static int send_session_fds(const int *fds
, size_t nb_fd
)
194 ret
= -LTTNG_ERR_NO_SESSIOND
;
198 if (!fds
|| !nb_fd
) {
203 ret
= lttcomm_send_fds_unix_sock(sessiond_socket
, fds
, nb_fd
);
205 ret
= -LTTNG_ERR_FATAL
;
213 * Receive data from the sessiond socket.
215 * On success, returns the number of bytes received (>=0)
216 * On error, returns -1 (recvmsg() error) or -ENOTCONN
218 static int recv_data_sessiond(void *buf
, size_t len
)
223 ret
= -LTTNG_ERR_NO_SESSIOND
;
227 ret
= lttcomm_recv_unix_sock(sessiond_socket
, buf
, len
);
229 ret
= -LTTNG_ERR_FATAL
;
237 * Check if we are in the specified group.
239 * If yes return 1, else return -1.
242 int lttng_check_tracing_group(void)
244 struct group
*grp_tracing
; /* no free(). See getgrnam(3) */
246 int grp_list_size
, grp_id
, i
;
248 const char *grp_name
= tracing_group
;
250 /* Get GID of group 'tracing' */
251 grp_tracing
= getgrnam(grp_name
);
253 /* If grp_tracing is NULL, the group does not exist. */
257 /* Get number of supplementary group IDs */
258 grp_list_size
= getgroups(0, NULL
);
259 if (grp_list_size
< 0) {
264 /* Alloc group list of the right size */
265 grp_list
= zmalloc(grp_list_size
* sizeof(gid_t
));
270 grp_id
= getgroups(grp_list_size
, grp_list
);
276 for (i
= 0; i
< grp_list_size
; i
++) {
277 if (grp_list
[i
] == grp_tracing
->gr_gid
) {
291 * Try connect to session daemon with sock_path.
293 * Return 0 on success, else -1
295 static int try_connect_sessiond(const char *sock_path
)
299 /* If socket exist, we check if the daemon listens for connect. */
300 ret
= access(sock_path
, F_OK
);
306 ret
= lttcomm_connect_unix_sock(sock_path
);
312 ret
= lttcomm_close_unix_sock(ret
);
314 PERROR("lttcomm_close_unix_sock");
324 * Set sessiond socket path by putting it in the global sessiond_sock_path
327 * Returns 0 on success, negative value on failure (the sessiond socket path
328 * is somehow too long or ENOMEM).
330 static int set_session_daemon_path(void)
332 int in_tgroup
= 0; /* In tracing group. */
338 /* Are we in the tracing group ? */
339 in_tgroup
= lttng_check_tracing_group();
342 if ((uid
== 0) || in_tgroup
) {
343 lttng_ctl_copy_string(sessiond_sock_path
,
344 DEFAULT_GLOBAL_CLIENT_UNIX_SOCK
, sizeof(sessiond_sock_path
));
352 ret
= try_connect_sessiond(sessiond_sock_path
);
356 /* Global session daemon not available... */
358 /* ...or not in tracing group (and not root), default */
361 * With GNU C < 2.1, snprintf returns -1 if the target buffer
363 * With GNU C >= 2.1, snprintf returns the required size
364 * (excluding closing null)
366 ret
= snprintf(sessiond_sock_path
, sizeof(sessiond_sock_path
),
367 DEFAULT_HOME_CLIENT_UNIX_SOCK
, utils_get_home_dir());
368 if ((ret
< 0) || (ret
>= sizeof(sessiond_sock_path
))) {
380 * Connect to the LTTng session daemon.
382 * On success, return 0. On error, return -1.
384 static int connect_sessiond(void)
388 /* Don't try to connect if already connected. */
393 ret
= set_session_daemon_path();
398 /* Connect to the sesssion daemon. */
399 ret
= lttcomm_connect_unix_sock(sessiond_sock_path
);
404 sessiond_socket
= ret
;
414 * Clean disconnect from the session daemon.
416 * On success, return 0. On error, return -1.
418 static int disconnect_sessiond(void)
423 ret
= lttcomm_close_unix_sock(sessiond_socket
);
431 static int recv_sessiond_optional_data(size_t len
, void **user_buf
,
439 ret
= -LTTNG_ERR_INVALID
;
449 ret
= recv_data_sessiond(buf
, len
);
455 ret
= -LTTNG_ERR_INVALID
;
459 /* Move ownership of command header buffer to user. */
464 /* No command header. */
480 * Ask the session daemon a specific command and put the data into buf.
481 * Takes extra var. len. data and file descriptors as input to send to the
484 * Return size of data (only payload, not header) or a negative error code.
487 int lttng_ctl_ask_sessiond_fds_varlen(struct lttcomm_session_msg
*lsm
,
488 const int *fds
, size_t nb_fd
, const void *vardata
,
489 size_t vardata_len
, void **user_payload_buf
,
490 void **user_cmd_header_buf
, size_t *user_cmd_header_len
)
494 struct lttcomm_lttng_msg llm
;
496 ret
= connect_sessiond();
498 ret
= -LTTNG_ERR_NO_SESSIOND
;
502 /* Send command to session daemon */
503 ret
= send_session_msg(lsm
);
505 /* Ret value is a valid lttng error code. */
508 /* Send var len data */
509 ret
= send_session_varlen(vardata
, vardata_len
);
511 /* Ret value is a valid lttng error code. */
516 ret
= send_session_fds(fds
, nb_fd
);
518 /* Ret value is a valid lttng error code. */
522 /* Get header from data transmission */
523 ret
= recv_data_sessiond(&llm
, sizeof(llm
));
525 /* Ret value is a valid lttng error code. */
529 /* Check error code if OK */
530 if (llm
.ret_code
!= LTTNG_OK
) {
535 /* Get command header from data transmission */
536 ret
= recv_sessiond_optional_data(llm
.cmd_header_size
,
537 user_cmd_header_buf
, user_cmd_header_len
);
542 /* Get payload from data transmission */
543 ret
= recv_sessiond_optional_data(llm
.data_size
, user_payload_buf
,
552 disconnect_sessiond();
557 * Create lttng handle and return pointer.
559 * The returned pointer will be NULL in case of malloc() error.
561 struct lttng_handle
*lttng_create_handle(const char *session_name
,
562 struct lttng_domain
*domain
)
564 struct lttng_handle
*handle
= NULL
;
566 handle
= zmalloc(sizeof(struct lttng_handle
));
567 if (handle
== NULL
) {
568 PERROR("malloc handle");
572 /* Copy session name */
573 lttng_ctl_copy_string(handle
->session_name
, session_name
,
574 sizeof(handle
->session_name
));
576 /* Copy lttng domain or leave initialized to 0. */
578 lttng_ctl_copy_lttng_domain(&handle
->domain
, domain
);
586 * Destroy handle by free(3) the pointer.
588 void lttng_destroy_handle(struct lttng_handle
*handle
)
594 * Register an outside consumer.
596 * Returns size of returned session payload data or a negative error code.
598 int lttng_register_consumer(struct lttng_handle
*handle
,
599 const char *socket_path
)
601 struct lttcomm_session_msg lsm
;
603 if (handle
== NULL
|| socket_path
== NULL
) {
604 return -LTTNG_ERR_INVALID
;
607 memset(&lsm
, 0, sizeof(lsm
));
608 lsm
.cmd_type
= LTTNG_REGISTER_CONSUMER
;
609 lttng_ctl_copy_string(lsm
.session
.name
, handle
->session_name
,
610 sizeof(lsm
.session
.name
));
611 lttng_ctl_copy_lttng_domain(&lsm
.domain
, &handle
->domain
);
613 lttng_ctl_copy_string(lsm
.u
.reg
.path
, socket_path
,
614 sizeof(lsm
.u
.reg
.path
));
616 return lttng_ctl_ask_sessiond(&lsm
, NULL
);
620 * Start tracing for all traces of the session.
622 * Returns size of returned session payload data or a negative error code.
624 int lttng_start_tracing(const char *session_name
)
626 struct lttcomm_session_msg lsm
;
628 if (session_name
== NULL
) {
629 return -LTTNG_ERR_INVALID
;
632 memset(&lsm
, 0, sizeof(lsm
));
633 lsm
.cmd_type
= LTTNG_START_TRACE
;
635 lttng_ctl_copy_string(lsm
.session
.name
, session_name
,
636 sizeof(lsm
.session
.name
));
638 return lttng_ctl_ask_sessiond(&lsm
, NULL
);
642 * Stop tracing for all traces of the session.
644 static int _lttng_stop_tracing(const char *session_name
, int wait
)
647 struct lttcomm_session_msg lsm
;
649 if (session_name
== NULL
) {
650 return -LTTNG_ERR_INVALID
;
653 memset(&lsm
, 0, sizeof(lsm
));
654 lsm
.cmd_type
= LTTNG_STOP_TRACE
;
656 lttng_ctl_copy_string(lsm
.session
.name
, session_name
,
657 sizeof(lsm
.session
.name
));
659 ret
= lttng_ctl_ask_sessiond(&lsm
, NULL
);
660 if (ret
< 0 && ret
!= -LTTNG_ERR_TRACE_ALREADY_STOPPED
) {
668 /* Check for data availability */
670 data_ret
= lttng_data_pending(session_name
);
672 /* Return the data available call error. */
678 * Data sleep time before retrying (in usec). Don't sleep if the
679 * call returned value indicates availability.
682 usleep(DEFAULT_DATA_AVAILABILITY_WAIT_TIME
);
684 } while (data_ret
!= 0);
692 * Stop tracing and wait for data availability.
694 int lttng_stop_tracing(const char *session_name
)
696 return _lttng_stop_tracing(session_name
, 1);
700 * Stop tracing but _don't_ wait for data availability.
702 int lttng_stop_tracing_no_wait(const char *session_name
)
704 return _lttng_stop_tracing(session_name
, 0);
708 * Add context to a channel.
710 * If the given channel is NULL, add the contexts to all channels.
711 * The event_name param is ignored.
713 * Returns the size of the returned payload data or a negative error code.
715 int lttng_add_context(struct lttng_handle
*handle
,
716 struct lttng_event_context
*ctx
, const char *event_name
,
717 const char *channel_name
)
722 struct lttcomm_session_msg lsm
;
724 /* Safety check. Both are mandatory. */
725 if (handle
== NULL
|| ctx
== NULL
) {
726 ret
= -LTTNG_ERR_INVALID
;
730 memset(&lsm
, 0, sizeof(lsm
));
731 lsm
.cmd_type
= LTTNG_ADD_CONTEXT
;
733 /* If no channel name, send empty string. */
734 if (channel_name
== NULL
) {
735 lttng_ctl_copy_string(lsm
.u
.context
.channel_name
, "",
736 sizeof(lsm
.u
.context
.channel_name
));
738 lttng_ctl_copy_string(lsm
.u
.context
.channel_name
, channel_name
,
739 sizeof(lsm
.u
.context
.channel_name
));
742 lttng_ctl_copy_lttng_domain(&lsm
.domain
, &handle
->domain
);
743 lttng_ctl_copy_string(lsm
.session
.name
, handle
->session_name
,
744 sizeof(lsm
.session
.name
));
746 if (ctx
->ctx
== LTTNG_EVENT_CONTEXT_APP_CONTEXT
) {
747 size_t provider_len
, ctx_len
;
748 const char *provider_name
= ctx
->u
.app_ctx
.provider_name
;
749 const char *ctx_name
= ctx
->u
.app_ctx
.ctx_name
;
751 if (!provider_name
|| !ctx_name
) {
752 ret
= -LTTNG_ERR_INVALID
;
756 provider_len
= strlen(provider_name
);
757 if (provider_len
== 0) {
758 ret
= -LTTNG_ERR_INVALID
;
761 lsm
.u
.context
.provider_name_len
= provider_len
;
763 ctx_len
= strlen(ctx_name
);
765 ret
= -LTTNG_ERR_INVALID
;
768 lsm
.u
.context
.context_name_len
= ctx_len
;
770 len
= provider_len
+ ctx_len
;
773 ret
= -LTTNG_ERR_NOMEM
;
777 memcpy(buf
, provider_name
, provider_len
);
778 memcpy(buf
+ provider_len
, ctx_name
, ctx_len
);
780 memcpy(&lsm
.u
.context
.ctx
, ctx
, sizeof(struct lttng_event_context
));
782 if (ctx
->ctx
== LTTNG_EVENT_CONTEXT_APP_CONTEXT
) {
784 * Don't leak application addresses to the sessiond.
785 * This is only necessary when ctx is for an app ctx otherwise
786 * the values inside the union (type & config) are overwritten.
788 lsm
.u
.context
.ctx
.u
.app_ctx
.provider_name
= NULL
;
789 lsm
.u
.context
.ctx
.u
.app_ctx
.ctx_name
= NULL
;
792 ret
= lttng_ctl_ask_sessiond_varlen_no_cmd_header(&lsm
, buf
, len
, NULL
);
799 * Enable event(s) for a channel.
801 * If no event name is specified, all events are enabled.
802 * If no channel name is specified, the default 'channel0' is used.
804 * Returns size of returned session payload data or a negative error code.
806 int lttng_enable_event(struct lttng_handle
*handle
,
807 struct lttng_event
*ev
, const char *channel_name
)
809 return lttng_enable_event_with_exclusions(handle
, ev
, channel_name
,
814 * Create or enable an event with a filter expression.
816 * Return negative error value on error.
817 * Return size of returned session payload data if OK.
819 int lttng_enable_event_with_filter(struct lttng_handle
*handle
,
820 struct lttng_event
*event
, const char *channel_name
,
821 const char *filter_expression
)
823 return lttng_enable_event_with_exclusions(handle
, event
, channel_name
,
824 filter_expression
, 0, NULL
);
828 * Depending on the event, return a newly allocated agent filter expression or
829 * NULL if not applicable.
831 * An event with NO loglevel and the name is * will return NULL.
833 static char *set_agent_filter(const char *filter
, struct lttng_event
*ev
)
836 char *agent_filter
= NULL
;
840 /* Don't add filter for the '*' event. */
841 if (strcmp(ev
->name
, "*") != 0) {
843 err
= asprintf(&agent_filter
, "(%s) && (logger_name == \"%s\")", filter
,
846 err
= asprintf(&agent_filter
, "logger_name == \"%s\"", ev
->name
);
854 /* Add loglevel filtering if any for the JUL domain. */
855 if (ev
->loglevel_type
!= LTTNG_EVENT_LOGLEVEL_ALL
) {
858 if (ev
->loglevel_type
== LTTNG_EVENT_LOGLEVEL_RANGE
) {
864 if (filter
|| agent_filter
) {
867 err
= asprintf(&new_filter
, "(%s) && (int_loglevel %s %d)",
868 agent_filter
? agent_filter
: filter
, op
,
873 agent_filter
= new_filter
;
875 err
= asprintf(&agent_filter
, "int_loglevel %s %d", op
,
891 * Generate the filter bytecode from a given filter expression string. Put the
892 * newly allocated parser context in ctxp and populate the lsm object with the
895 * Return 0 on success else a LTTNG_ERR_* code and ctxp is untouched.
897 static int generate_filter(char *filter_expression
,
898 struct lttcomm_session_msg
*lsm
, struct filter_parser_ctx
**ctxp
)
901 struct filter_parser_ctx
*ctx
= NULL
;
904 assert(filter_expression
);
909 * Casting const to non-const, as the underlying function will use it in
912 fmem
= lttng_fmemopen((void *) filter_expression
,
913 strlen(filter_expression
), "r");
915 fprintf(stderr
, "Error opening memory as stream\n");
916 ret
= -LTTNG_ERR_FILTER_NOMEM
;
919 ctx
= filter_parser_ctx_alloc(fmem
);
921 fprintf(stderr
, "Error allocating parser\n");
922 ret
= -LTTNG_ERR_FILTER_NOMEM
;
923 goto filter_alloc_error
;
925 ret
= filter_parser_ctx_append_ast(ctx
);
927 fprintf(stderr
, "Parse error\n");
928 ret
= -LTTNG_ERR_FILTER_INVAL
;
932 ret
= filter_visitor_print_xml(ctx
, stdout
, 0);
935 fprintf(stderr
, "XML print error\n");
936 ret
= -LTTNG_ERR_FILTER_INVAL
;
941 dbg_printf("Generating IR... ");
943 ret
= filter_visitor_ir_generate(ctx
);
945 fprintf(stderr
, "Generate IR error\n");
946 ret
= -LTTNG_ERR_FILTER_INVAL
;
949 dbg_printf("done\n");
951 dbg_printf("Validating IR... ");
953 ret
= filter_visitor_ir_check_binary_op_nesting(ctx
);
955 ret
= -LTTNG_ERR_FILTER_INVAL
;
959 /* Normalize globbing patterns in the expression. */
960 ret
= filter_visitor_ir_normalize_glob_patterns(ctx
);
962 ret
= -LTTNG_ERR_FILTER_INVAL
;
966 /* Validate strings used as literals in the expression. */
967 ret
= filter_visitor_ir_validate_string(ctx
);
969 ret
= -LTTNG_ERR_FILTER_INVAL
;
973 /* Validate globbing patterns in the expression. */
974 ret
= filter_visitor_ir_validate_globbing(ctx
);
976 ret
= -LTTNG_ERR_FILTER_INVAL
;
980 dbg_printf("done\n");
982 dbg_printf("Generating bytecode... ");
984 ret
= filter_visitor_bytecode_generate(ctx
);
986 fprintf(stderr
, "Generate bytecode error\n");
987 ret
= -LTTNG_ERR_FILTER_INVAL
;
990 dbg_printf("done\n");
991 dbg_printf("Size of bytecode generated: %u bytes.\n",
992 bytecode_get_len(&ctx
->bytecode
->b
));
994 lsm
->u
.enable
.bytecode_len
= sizeof(ctx
->bytecode
->b
)
995 + bytecode_get_len(&ctx
->bytecode
->b
);
996 lsm
->u
.enable
.expression_len
= strlen(filter_expression
) + 1;
998 /* No need to keep the memory stream. */
999 if (fclose(fmem
) != 0) {
1007 filter_ir_free(ctx
);
1008 filter_parser_ctx_free(ctx
);
1010 if (fclose(fmem
) != 0) {
1018 * Enable event(s) for a channel, possibly with exclusions and a filter.
1019 * If no event name is specified, all events are enabled.
1020 * If no channel name is specified, the default name is used.
1021 * If filter expression is not NULL, the filter is set for the event.
1022 * If exclusion count is not zero, the exclusions are set for the event.
1023 * Returns size of returned session payload data or a negative error code.
1025 int lttng_enable_event_with_exclusions(struct lttng_handle
*handle
,
1026 struct lttng_event
*ev
, const char *channel_name
,
1027 const char *original_filter_expression
,
1028 int exclusion_count
, char **exclusion_list
)
1030 struct lttcomm_session_msg lsm
;
1031 struct lttng_dynamic_buffer send_buffer
;
1032 int ret
= 0, i
, fd_to_send
= -1;
1033 bool send_fd
= false;
1034 unsigned int free_filter_expression
= 0;
1035 struct filter_parser_ctx
*ctx
= NULL
;
1037 * Cast as non-const since we may replace the filter expression
1038 * by a dynamically allocated string. Otherwise, the original
1039 * string is not modified.
1041 char *filter_expression
= (char *) original_filter_expression
;
1043 if (handle
== NULL
|| ev
== NULL
) {
1044 ret
= -LTTNG_ERR_INVALID
;
1049 * Empty filter string will always be rejected by the parser
1050 * anyway, so treat this corner-case early to eliminate
1051 * lttng_fmemopen error for 0-byte allocation.
1053 if (filter_expression
&& filter_expression
[0] == '\0') {
1054 ret
= -LTTNG_ERR_INVALID
;
1058 memset(&lsm
, 0, sizeof(lsm
));
1060 /* If no channel name, send empty string. */
1061 if (channel_name
== NULL
) {
1062 lttng_ctl_copy_string(lsm
.u
.enable
.channel_name
, "",
1063 sizeof(lsm
.u
.enable
.channel_name
));
1065 lttng_ctl_copy_string(lsm
.u
.enable
.channel_name
, channel_name
,
1066 sizeof(lsm
.u
.enable
.channel_name
));
1069 lsm
.cmd_type
= LTTNG_ENABLE_EVENT
;
1070 if (ev
->name
[0] == '\0') {
1071 /* Enable all events */
1072 lttng_ctl_copy_string(ev
->name
, "*", sizeof(ev
->name
));
1075 lttng_ctl_copy_lttng_domain(&lsm
.domain
, &handle
->domain
);
1076 /* FIXME: copying non-packed struct to packed struct. */
1077 memcpy(&lsm
.u
.enable
.event
, ev
, sizeof(lsm
.u
.enable
.event
));
1079 lttng_ctl_copy_string(lsm
.session
.name
, handle
->session_name
,
1080 sizeof(lsm
.session
.name
));
1081 lsm
.u
.enable
.exclusion_count
= exclusion_count
;
1082 lsm
.u
.enable
.bytecode_len
= 0;
1085 * We have either a filter or some exclusions, so we need to set up
1086 * a variable-length memory block from where to send the data.
1088 lttng_dynamic_buffer_init(&send_buffer
);
1090 /* Parse filter expression. */
1091 if (filter_expression
!= NULL
|| handle
->domain
.type
== LTTNG_DOMAIN_JUL
1092 || handle
->domain
.type
== LTTNG_DOMAIN_LOG4J
1093 || handle
->domain
.type
== LTTNG_DOMAIN_PYTHON
) {
1094 if (handle
->domain
.type
== LTTNG_DOMAIN_JUL
||
1095 handle
->domain
.type
== LTTNG_DOMAIN_LOG4J
||
1096 handle
->domain
.type
== LTTNG_DOMAIN_PYTHON
) {
1099 /* Setup JUL filter if needed. */
1100 agent_filter
= set_agent_filter(filter_expression
, ev
);
1101 if (!agent_filter
) {
1102 if (!filter_expression
) {
1104 * No JUL and no filter, just skip
1111 * With an agent filter, the original filter has
1112 * been added to it thus replace the filter
1115 filter_expression
= agent_filter
;
1116 free_filter_expression
= 1;
1120 ret
= generate_filter(filter_expression
, &lsm
, &ctx
);
1126 ret
= lttng_dynamic_buffer_set_capacity(&send_buffer
,
1127 lsm
.u
.enable
.bytecode_len
1128 + lsm
.u
.enable
.expression_len
1129 + LTTNG_SYMBOL_NAME_LEN
* exclusion_count
);
1131 ret
= -LTTNG_ERR_EXCLUSION_NOMEM
;
1135 /* Put exclusion names first in the data. */
1136 for (i
= 0; i
< exclusion_count
; i
++) {
1137 size_t exclusion_len
;
1139 exclusion_len
= lttng_strnlen(*(exclusion_list
+ i
),
1140 LTTNG_SYMBOL_NAME_LEN
);
1141 if (exclusion_len
== LTTNG_SYMBOL_NAME_LEN
) {
1142 /* Exclusion is not NULL-terminated. */
1143 ret
= -LTTNG_ERR_INVALID
;
1147 ret
= lttng_dynamic_buffer_append(&send_buffer
,
1148 *(exclusion_list
+ i
),
1149 LTTNG_SYMBOL_NAME_LEN
);
1155 /* Add filter expression next. */
1156 if (filter_expression
) {
1157 ret
= lttng_dynamic_buffer_append(&send_buffer
,
1158 filter_expression
, lsm
.u
.enable
.expression_len
);
1163 /* Add filter bytecode next. */
1164 if (ctx
&& lsm
.u
.enable
.bytecode_len
!= 0) {
1165 ret
= lttng_dynamic_buffer_append(&send_buffer
,
1166 &ctx
->bytecode
->b
, lsm
.u
.enable
.bytecode_len
);
1171 if (ev
->extended
.ptr
) {
1172 struct lttng_event_extended
*ev_ext
=
1173 (struct lttng_event_extended
*) ev
->extended
.ptr
;
1175 if (ev_ext
->probe_location
) {
1177 * lttng_userspace_probe_location_serialize returns the
1178 * number of bytes that was appended to the buffer.
1180 ret
= lttng_userspace_probe_location_serialize(
1181 ev_ext
->probe_location
, &send_buffer
,
1187 send_fd
= fd_to_send
>= 0;
1189 * Set the size of the userspace probe location element
1190 * of the buffer so that the receiving side knows where
1193 lsm
.u
.enable
.userspace_probe_location_len
= ret
;
1197 ret
= lttng_ctl_ask_sessiond_fds_varlen(&lsm
,
1198 send_fd
? &fd_to_send
: NULL
,
1200 send_buffer
.size
? send_buffer
.data
: NULL
,
1201 send_buffer
.size
, NULL
, NULL
, 0);
1204 if (filter_expression
&& ctx
) {
1205 filter_bytecode_free(ctx
);
1206 filter_ir_free(ctx
);
1207 filter_parser_ctx_free(ctx
);
1210 if (free_filter_expression
) {
1212 * The filter expression has been replaced and must be freed as
1213 * it is not the original filter expression received as a
1216 free(filter_expression
);
1220 * Return directly to the caller and don't ask the sessiond since
1221 * something went wrong in the parsing of data above.
1223 lttng_dynamic_buffer_reset(&send_buffer
);
1227 ret
= lttng_ctl_ask_sessiond(&lsm
, NULL
);
1231 int lttng_disable_event_ext(struct lttng_handle
*handle
,
1232 struct lttng_event
*ev
, const char *channel_name
,
1233 const char *original_filter_expression
)
1235 struct lttcomm_session_msg lsm
;
1238 unsigned int free_filter_expression
= 0;
1239 struct filter_parser_ctx
*ctx
= NULL
;
1241 * Cast as non-const since we may replace the filter expression
1242 * by a dynamically allocated string. Otherwise, the original
1243 * string is not modified.
1245 char *filter_expression
= (char *) original_filter_expression
;
1247 if (handle
== NULL
|| ev
== NULL
) {
1248 ret
= -LTTNG_ERR_INVALID
;
1253 * Empty filter string will always be rejected by the parser
1254 * anyway, so treat this corner-case early to eliminate
1255 * lttng_fmemopen error for 0-byte allocation.
1257 if (filter_expression
&& filter_expression
[0] == '\0') {
1258 ret
= -LTTNG_ERR_INVALID
;
1262 memset(&lsm
, 0, sizeof(lsm
));
1264 /* If no channel name, send empty string. */
1265 if (channel_name
== NULL
) {
1266 lttng_ctl_copy_string(lsm
.u
.disable
.channel_name
, "",
1267 sizeof(lsm
.u
.disable
.channel_name
));
1269 lttng_ctl_copy_string(lsm
.u
.disable
.channel_name
, channel_name
,
1270 sizeof(lsm
.u
.disable
.channel_name
));
1273 lsm
.cmd_type
= LTTNG_DISABLE_EVENT
;
1275 lttng_ctl_copy_lttng_domain(&lsm
.domain
, &handle
->domain
);
1276 /* FIXME: copying non-packed struct to packed struct. */
1277 memcpy(&lsm
.u
.disable
.event
, ev
, sizeof(lsm
.u
.disable
.event
));
1279 lttng_ctl_copy_string(lsm
.session
.name
, handle
->session_name
,
1280 sizeof(lsm
.session
.name
));
1281 lsm
.u
.disable
.bytecode_len
= 0;
1284 * For the JUL domain, a filter is enforced except for the
1285 * disable all event. This is done to avoid having the event in
1286 * all sessions thus filtering by logger name.
1288 if (filter_expression
== NULL
&&
1289 (handle
->domain
.type
!= LTTNG_DOMAIN_JUL
&&
1290 handle
->domain
.type
!= LTTNG_DOMAIN_LOG4J
&&
1291 handle
->domain
.type
!= LTTNG_DOMAIN_PYTHON
)) {
1296 * We have a filter, so we need to set up a variable-length
1297 * memory block from where to send the data.
1300 /* Parse filter expression */
1301 if (filter_expression
!= NULL
|| handle
->domain
.type
== LTTNG_DOMAIN_JUL
1302 || handle
->domain
.type
== LTTNG_DOMAIN_LOG4J
1303 || handle
->domain
.type
== LTTNG_DOMAIN_PYTHON
) {
1304 if (handle
->domain
.type
== LTTNG_DOMAIN_JUL
||
1305 handle
->domain
.type
== LTTNG_DOMAIN_LOG4J
||
1306 handle
->domain
.type
== LTTNG_DOMAIN_PYTHON
) {
1309 /* Setup JUL filter if needed. */
1310 agent_filter
= set_agent_filter(filter_expression
, ev
);
1311 if (!agent_filter
) {
1312 if (!filter_expression
) {
1314 * No JUL and no filter, just skip
1321 * With a JUL filter, the original filter has
1322 * been added to it thus replace the filter
1325 filter_expression
= agent_filter
;
1326 free_filter_expression
= 1;
1330 ret
= generate_filter(filter_expression
, &lsm
, &ctx
);
1336 varlen_data
= zmalloc(lsm
.u
.disable
.bytecode_len
1337 + lsm
.u
.disable
.expression_len
);
1339 ret
= -LTTNG_ERR_EXCLUSION_NOMEM
;
1343 /* Add filter expression. */
1344 if (lsm
.u
.disable
.expression_len
!= 0) {
1347 lsm
.u
.disable
.expression_len
);
1349 /* Add filter bytecode next. */
1350 if (ctx
&& lsm
.u
.disable
.bytecode_len
!= 0) {
1352 + lsm
.u
.disable
.expression_len
,
1354 lsm
.u
.disable
.bytecode_len
);
1357 ret
= lttng_ctl_ask_sessiond_varlen_no_cmd_header(&lsm
, varlen_data
,
1358 lsm
.u
.disable
.bytecode_len
+ lsm
.u
.disable
.expression_len
, NULL
);
1362 if (filter_expression
&& ctx
) {
1363 filter_bytecode_free(ctx
);
1364 filter_ir_free(ctx
);
1365 filter_parser_ctx_free(ctx
);
1368 if (free_filter_expression
) {
1370 * The filter expression has been replaced and must be freed as
1371 * it is not the original filter expression received as a
1374 free(filter_expression
);
1378 * Return directly to the caller and don't ask the sessiond since
1379 * something went wrong in the parsing of data above.
1384 ret
= lttng_ctl_ask_sessiond(&lsm
, NULL
);
1389 * Disable event(s) of a channel and domain.
1390 * If no event name is specified, all events are disabled.
1391 * If no channel name is specified, the default 'channel0' is used.
1392 * Returns size of returned session payload data or a negative error code.
1394 int lttng_disable_event(struct lttng_handle
*handle
, const char *name
,
1395 const char *channel_name
)
1397 struct lttng_event ev
;
1399 memset(&ev
, 0, sizeof(ev
));
1401 ev
.type
= LTTNG_EVENT_ALL
;
1402 lttng_ctl_copy_string(ev
.name
, name
, sizeof(ev
.name
));
1403 return lttng_disable_event_ext(handle
, &ev
, channel_name
, NULL
);
1406 struct lttng_channel
*lttng_channel_create(struct lttng_domain
*domain
)
1408 struct lttng_channel
*channel
= NULL
;
1409 struct lttng_channel_extended
*extended
= NULL
;
1415 /* Validate domain. */
1416 switch (domain
->type
) {
1417 case LTTNG_DOMAIN_UST
:
1418 switch (domain
->buf_type
) {
1419 case LTTNG_BUFFER_PER_UID
:
1420 case LTTNG_BUFFER_PER_PID
:
1426 case LTTNG_DOMAIN_KERNEL
:
1427 if (domain
->buf_type
!= LTTNG_BUFFER_GLOBAL
) {
1435 channel
= zmalloc(sizeof(*channel
));
1440 extended
= zmalloc(sizeof(*extended
));
1445 channel
->attr
.extended
.ptr
= extended
;
1447 lttng_channel_set_default_attr(domain
, &channel
->attr
);
1455 void lttng_channel_destroy(struct lttng_channel
*channel
)
1461 if (channel
->attr
.extended
.ptr
) {
1462 free(channel
->attr
.extended
.ptr
);
1468 * Enable channel per domain
1469 * Returns size of returned session payload data or a negative error code.
1471 int lttng_enable_channel(struct lttng_handle
*handle
,
1472 struct lttng_channel
*in_chan
)
1474 struct lttcomm_session_msg lsm
;
1476 /* NULL arguments are forbidden. No default values. */
1477 if (handle
== NULL
|| in_chan
== NULL
) {
1478 return -LTTNG_ERR_INVALID
;
1481 memset(&lsm
, 0, sizeof(lsm
));
1482 memcpy(&lsm
.u
.channel
.chan
, in_chan
, sizeof(lsm
.u
.channel
.chan
));
1483 lsm
.u
.channel
.chan
.attr
.extended
.ptr
= NULL
;
1485 if (!in_chan
->attr
.extended
.ptr
) {
1486 struct lttng_channel
*channel
;
1487 struct lttng_channel_extended
*extended
;
1489 channel
= lttng_channel_create(&handle
->domain
);
1491 return -LTTNG_ERR_NOMEM
;
1495 * Create a new channel in order to use default extended
1498 extended
= (struct lttng_channel_extended
*)
1499 channel
->attr
.extended
.ptr
;
1500 memcpy(&lsm
.u
.channel
.extended
, extended
, sizeof(*extended
));
1501 lttng_channel_destroy(channel
);
1503 struct lttng_channel_extended
*extended
;
1505 extended
= (struct lttng_channel_extended
*)
1506 in_chan
->attr
.extended
.ptr
;
1507 memcpy(&lsm
.u
.channel
.extended
, extended
, sizeof(*extended
));
1510 lsm
.cmd_type
= LTTNG_ENABLE_CHANNEL
;
1511 lttng_ctl_copy_lttng_domain(&lsm
.domain
, &handle
->domain
);
1513 lttng_ctl_copy_string(lsm
.session
.name
, handle
->session_name
,
1514 sizeof(lsm
.session
.name
));
1516 return lttng_ctl_ask_sessiond(&lsm
, NULL
);
1520 * All tracing will be stopped for registered events of the channel.
1521 * Returns size of returned session payload data or a negative error code.
1523 int lttng_disable_channel(struct lttng_handle
*handle
, const char *name
)
1525 struct lttcomm_session_msg lsm
;
1527 /* Safety check. Both are mandatory. */
1528 if (handle
== NULL
|| name
== NULL
) {
1529 return -LTTNG_ERR_INVALID
;
1532 memset(&lsm
, 0, sizeof(lsm
));
1534 lsm
.cmd_type
= LTTNG_DISABLE_CHANNEL
;
1536 lttng_ctl_copy_string(lsm
.u
.disable
.channel_name
, name
,
1537 sizeof(lsm
.u
.disable
.channel_name
));
1539 lttng_ctl_copy_lttng_domain(&lsm
.domain
, &handle
->domain
);
1541 lttng_ctl_copy_string(lsm
.session
.name
, handle
->session_name
,
1542 sizeof(lsm
.session
.name
));
1544 return lttng_ctl_ask_sessiond(&lsm
, NULL
);
1548 * Add PID to session tracker.
1549 * Return 0 on success else a negative LTTng error code.
1551 int lttng_track_pid(struct lttng_handle
*handle
, int pid
)
1553 struct lttcomm_session_msg lsm
;
1555 /* NULL arguments are forbidden. No default values. */
1556 if (handle
== NULL
) {
1557 return -LTTNG_ERR_INVALID
;
1560 memset(&lsm
, 0, sizeof(lsm
));
1562 lsm
.cmd_type
= LTTNG_TRACK_PID
;
1563 lsm
.u
.pid_tracker
.pid
= pid
;
1565 lttng_ctl_copy_lttng_domain(&lsm
.domain
, &handle
->domain
);
1567 lttng_ctl_copy_string(lsm
.session
.name
, handle
->session_name
,
1568 sizeof(lsm
.session
.name
));
1570 return lttng_ctl_ask_sessiond(&lsm
, NULL
);
1574 * Remove PID from session tracker.
1575 * Return 0 on success else a negative LTTng error code.
1577 int lttng_untrack_pid(struct lttng_handle
*handle
, int pid
)
1579 struct lttcomm_session_msg lsm
;
1581 /* NULL arguments are forbidden. No default values. */
1582 if (handle
== NULL
) {
1583 return -LTTNG_ERR_INVALID
;
1586 memset(&lsm
, 0, sizeof(lsm
));
1588 lsm
.cmd_type
= LTTNG_UNTRACK_PID
;
1589 lsm
.u
.pid_tracker
.pid
= pid
;
1591 lttng_ctl_copy_lttng_domain(&lsm
.domain
, &handle
->domain
);
1593 lttng_ctl_copy_string(lsm
.session
.name
, handle
->session_name
,
1594 sizeof(lsm
.session
.name
));
1596 return lttng_ctl_ask_sessiond(&lsm
, NULL
);
1600 * Lists all available tracepoints of domain.
1601 * Sets the contents of the events array.
1602 * Returns the number of lttng_event entries in events;
1603 * on error, returns a negative value.
1605 int lttng_list_tracepoints(struct lttng_handle
*handle
,
1606 struct lttng_event
**events
)
1609 struct lttcomm_session_msg lsm
;
1611 if (handle
== NULL
) {
1612 return -LTTNG_ERR_INVALID
;
1615 memset(&lsm
, 0, sizeof(lsm
));
1616 lsm
.cmd_type
= LTTNG_LIST_TRACEPOINTS
;
1617 lttng_ctl_copy_lttng_domain(&lsm
.domain
, &handle
->domain
);
1619 ret
= lttng_ctl_ask_sessiond(&lsm
, (void **) events
);
1624 return ret
/ sizeof(struct lttng_event
);
1628 * Lists all available tracepoint fields of domain.
1629 * Sets the contents of the event field array.
1630 * Returns the number of lttng_event_field entries in events;
1631 * on error, returns a negative value.
1633 int lttng_list_tracepoint_fields(struct lttng_handle
*handle
,
1634 struct lttng_event_field
**fields
)
1637 struct lttcomm_session_msg lsm
;
1639 if (handle
== NULL
) {
1640 return -LTTNG_ERR_INVALID
;
1643 memset(&lsm
, 0, sizeof(lsm
));
1644 lsm
.cmd_type
= LTTNG_LIST_TRACEPOINT_FIELDS
;
1645 lttng_ctl_copy_lttng_domain(&lsm
.domain
, &handle
->domain
);
1647 ret
= lttng_ctl_ask_sessiond(&lsm
, (void **) fields
);
1652 return ret
/ sizeof(struct lttng_event_field
);
1656 * Lists all available kernel system calls. Allocates and sets the contents of
1659 * Returns the number of lttng_event entries in events; on error, returns a
1662 int lttng_list_syscalls(struct lttng_event
**events
)
1665 struct lttcomm_session_msg lsm
;
1668 return -LTTNG_ERR_INVALID
;
1671 memset(&lsm
, 0, sizeof(lsm
));
1672 lsm
.cmd_type
= LTTNG_LIST_SYSCALLS
;
1673 /* Force kernel domain for system calls. */
1674 lsm
.domain
.type
= LTTNG_DOMAIN_KERNEL
;
1676 ret
= lttng_ctl_ask_sessiond(&lsm
, (void **) events
);
1681 return ret
/ sizeof(struct lttng_event
);
1685 * Returns a human readable string describing
1686 * the error code (a negative value).
1688 const char *lttng_strerror(int code
)
1690 return error_get_str(code
);
1694 * Create a brand new session using name and url for destination.
1696 * Returns LTTNG_OK on success or a negative error code.
1698 int lttng_create_session(const char *name
, const char *url
)
1702 struct lttcomm_session_msg lsm
;
1703 struct lttng_uri
*uris
= NULL
;
1706 return -LTTNG_ERR_INVALID
;
1709 memset(&lsm
, 0, sizeof(lsm
));
1711 lsm
.cmd_type
= LTTNG_CREATE_SESSION
;
1712 lttng_ctl_copy_string(lsm
.session
.name
, name
, sizeof(lsm
.session
.name
));
1714 /* There should never be a data URL */
1715 size
= uri_parse_str_urls(url
, NULL
, &uris
);
1717 return -LTTNG_ERR_INVALID
;
1720 lsm
.u
.uri
.size
= size
;
1722 ret
= lttng_ctl_ask_sessiond_varlen_no_cmd_header(&lsm
, uris
,
1723 sizeof(struct lttng_uri
) * size
, NULL
);
1730 * Destroy session using name.
1731 * Returns size of returned session payload data or a negative error code.
1734 int _lttng_destroy_session(const char *session_name
)
1736 struct lttcomm_session_msg lsm
;
1738 if (session_name
== NULL
) {
1739 return -LTTNG_ERR_INVALID
;
1742 memset(&lsm
, 0, sizeof(lsm
));
1743 lsm
.cmd_type
= LTTNG_DESTROY_SESSION
;
1745 lttng_ctl_copy_string(lsm
.session
.name
, session_name
,
1746 sizeof(lsm
.session
.name
));
1748 return lttng_ctl_ask_sessiond(&lsm
, NULL
);
1752 * Stop the session and wait for the data before destroying it
1754 int lttng_destroy_session(const char *session_name
)
1759 * Stop the tracing and wait for the data.
1761 ret
= _lttng_stop_tracing(session_name
, 1);
1762 if (ret
&& ret
!= -LTTNG_ERR_TRACE_ALREADY_STOPPED
) {
1766 ret
= _lttng_destroy_session(session_name
);
1772 * Destroy the session without waiting for the data.
1774 int lttng_destroy_session_no_wait(const char *session_name
)
1779 * Stop the tracing without waiting for the data.
1780 * The session might already have been stopped, so just
1783 ret
= _lttng_stop_tracing(session_name
, 0);
1784 if (ret
&& ret
!= -LTTNG_ERR_TRACE_ALREADY_STOPPED
) {
1788 ret
= _lttng_destroy_session(session_name
);
1794 * Ask the session daemon for all available sessions.
1795 * Sets the contents of the sessions array.
1796 * Returns the number of lttng_session entries in sessions;
1797 * on error, returns a negative value.
1799 int lttng_list_sessions(struct lttng_session
**sessions
)
1802 struct lttcomm_session_msg lsm
;
1804 memset(&lsm
, 0, sizeof(lsm
));
1805 lsm
.cmd_type
= LTTNG_LIST_SESSIONS
;
1806 ret
= lttng_ctl_ask_sessiond(&lsm
, (void**) sessions
);
1811 return ret
/ sizeof(struct lttng_session
);
1814 int lttng_set_session_shm_path(const char *session_name
,
1815 const char *shm_path
)
1817 struct lttcomm_session_msg lsm
;
1819 if (session_name
== NULL
) {
1820 return -LTTNG_ERR_INVALID
;
1823 memset(&lsm
, 0, sizeof(lsm
));
1824 lsm
.cmd_type
= LTTNG_SET_SESSION_SHM_PATH
;
1826 lttng_ctl_copy_string(lsm
.session
.name
, session_name
,
1827 sizeof(lsm
.session
.name
));
1828 lttng_ctl_copy_string(lsm
.u
.set_shm_path
.shm_path
, shm_path
,
1829 sizeof(lsm
.u
.set_shm_path
.shm_path
));
1831 return lttng_ctl_ask_sessiond(&lsm
, NULL
);
1835 * Ask the session daemon for all available domains of a session.
1836 * Sets the contents of the domains array.
1837 * Returns the number of lttng_domain entries in domains;
1838 * on error, returns a negative value.
1840 int lttng_list_domains(const char *session_name
,
1841 struct lttng_domain
**domains
)
1844 struct lttcomm_session_msg lsm
;
1846 if (session_name
== NULL
) {
1847 return -LTTNG_ERR_INVALID
;
1850 memset(&lsm
, 0, sizeof(lsm
));
1851 lsm
.cmd_type
= LTTNG_LIST_DOMAINS
;
1853 lttng_ctl_copy_string(lsm
.session
.name
, session_name
,
1854 sizeof(lsm
.session
.name
));
1856 ret
= lttng_ctl_ask_sessiond(&lsm
, (void**) domains
);
1861 return ret
/ sizeof(struct lttng_domain
);
1865 * Ask the session daemon for all available channels of a session.
1866 * Sets the contents of the channels array.
1867 * Returns the number of lttng_channel entries in channels;
1868 * on error, returns a negative value.
1870 int lttng_list_channels(struct lttng_handle
*handle
,
1871 struct lttng_channel
**channels
)
1874 size_t channel_count
, i
;
1875 const size_t channel_size
= sizeof(struct lttng_channel
) +
1876 sizeof(struct lttng_channel_extended
);
1877 struct lttcomm_session_msg lsm
;
1880 if (handle
== NULL
) {
1881 ret
= -LTTNG_ERR_INVALID
;
1885 memset(&lsm
, 0, sizeof(lsm
));
1886 lsm
.cmd_type
= LTTNG_LIST_CHANNELS
;
1887 lttng_ctl_copy_string(lsm
.session
.name
, handle
->session_name
,
1888 sizeof(lsm
.session
.name
));
1890 lttng_ctl_copy_lttng_domain(&lsm
.domain
, &handle
->domain
);
1892 ret
= lttng_ctl_ask_sessiond(&lsm
, (void**) channels
);
1897 if (ret
% channel_size
) {
1898 ret
= -LTTNG_ERR_UNK
;
1903 channel_count
= (size_t) ret
/ channel_size
;
1905 /* Set extended info pointers */
1906 extended_at
= ((void *) *channels
) +
1907 channel_count
* sizeof(struct lttng_channel
);
1908 for (i
= 0; i
< channel_count
; i
++) {
1909 struct lttng_channel
*chan
= &(*channels
)[i
];
1911 chan
->attr
.extended
.ptr
= extended_at
;
1912 extended_at
+= sizeof(struct lttng_channel_extended
);
1915 ret
= (int) channel_count
;
1921 * Ask the session daemon for all available events of a session channel.
1922 * Sets the contents of the events array.
1923 * Returns the number of lttng_event entries in events;
1924 * on error, returns a negative value.
1926 int lttng_list_events(struct lttng_handle
*handle
,
1927 const char *channel_name
, struct lttng_event
**events
)
1930 struct lttcomm_session_msg lsm
;
1931 struct lttcomm_event_command_header
*cmd_header
= NULL
;
1932 size_t cmd_header_len
;
1933 uint32_t nb_events
, i
;
1936 char *reception_buffer
= NULL
;
1937 char *listing
= NULL
;
1940 /* Safety check. An handle and channel name are mandatory */
1941 if (handle
== NULL
|| channel_name
== NULL
) {
1942 return -LTTNG_ERR_INVALID
;
1945 memset(&lsm
, 0, sizeof(lsm
));
1946 lsm
.cmd_type
= LTTNG_LIST_EVENTS
;
1947 lttng_ctl_copy_string(lsm
.session
.name
, handle
->session_name
,
1948 sizeof(lsm
.session
.name
));
1949 lttng_ctl_copy_string(lsm
.u
.list
.channel_name
, channel_name
,
1950 sizeof(lsm
.u
.list
.channel_name
));
1951 lttng_ctl_copy_lttng_domain(&lsm
.domain
, &handle
->domain
);
1953 ret
= lttng_ctl_ask_sessiond_fds_varlen(&lsm
, NULL
, 0, NULL
, 0,
1954 (void **) &reception_buffer
, (void **) &cmd_header
,
1960 /* Set number of events and free command header */
1961 nb_events
= cmd_header
->nb_events
;
1962 if (nb_events
> INT_MAX
) {
1970 * The buffer that is returned must contain a "flat" version of
1971 * the events that are returned. In other words, all pointers
1972 * within an lttng_event must point to a location within the returned
1973 * buffer so that the user may free by simply calling free() on the
1974 * returned buffer. This is needed in order to maintain API
1977 * A first pass is performed to figure the size of the buffer that
1978 * must be returned. A second pass is then performed to setup
1979 * the returned events so that their members always point within the
1982 * The layout of the returned buffer is as follows:
1983 * - struct lttng_event[nb_events],
1984 * - nb_events times the following:
1985 * - struct lttng_event_extended,
1986 * - flattened version of userspace_probe_location
1987 * - filter_expression
1989 * - padding to align to 64-bits
1991 comm_ext_at
= reception_buffer
+
1992 (nb_events
* sizeof(struct lttng_event
));
1993 storage_req
= nb_events
* sizeof(struct lttng_event
);
1995 for (i
= 0; i
< nb_events
; i
++) {
1996 struct lttcomm_event_extended_header
*ext_comm
=
1997 (struct lttcomm_event_extended_header
*) comm_ext_at
;
1999 comm_ext_at
+= sizeof(*ext_comm
);
2000 comm_ext_at
+= ext_comm
->filter_len
;
2002 ext_comm
->nb_exclusions
* LTTNG_SYMBOL_NAME_LEN
;
2004 storage_req
+= sizeof(struct lttng_event_extended
);
2005 /* TODO: missing size of flat userspace probe. */
2006 storage_req
+= ext_comm
->filter_len
;
2007 storage_req
+= ext_comm
->nb_exclusions
* LTTNG_SYMBOL_NAME_LEN
;
2008 storage_req
+= storage_req
% 8;
2011 listing
= zmalloc(storage_req
);
2015 memcpy(listing
, reception_buffer
,
2016 nb_events
* sizeof(struct lttng_event
));
2018 comm_ext_at
= reception_buffer
+
2019 (nb_events
* sizeof(struct lttng_event
));
2020 listing_at
= listing
+
2021 (nb_events
* sizeof(struct lttng_event
));
2022 for (i
= 0; i
< nb_events
; i
++) {
2023 struct lttng_event
*event
= (struct lttng_event
*)
2024 (listing
+ (sizeof(struct lttng_event
) * i
));
2025 struct lttcomm_event_extended_header
*ext_comm
=
2026 (struct lttcomm_event_extended_header
*) comm_ext_at
;
2027 struct lttng_event_extended
*event_extended
=
2028 (struct lttng_event_extended
*) listing_at
;
2030 event
->extended
.ptr
= event_extended
;
2031 listing_at
+= sizeof(*event_extended
);
2032 comm_ext_at
+= sizeof(*ext_comm
);
2034 /* Copy filter expression. */
2035 memcpy(listing_at
, comm_ext_at
, ext_comm
->filter_len
);
2036 event_extended
->filter_expression
= listing_at
;
2037 comm_ext_at
+= ext_comm
->filter_len
;
2038 listing_at
+= ext_comm
->filter_len
;
2040 /* Copy exclusions. */
2041 event_extended
->exclusions
.count
= ext_comm
->nb_exclusions
;
2042 event_extended
->exclusions
.strings
= listing_at
;
2043 memcpy(listing_at
, comm_ext_at
,
2044 ext_comm
->nb_exclusions
* LTTNG_SYMBOL_NAME_LEN
);
2045 listing_at
+= ext_comm
->nb_exclusions
* LTTNG_SYMBOL_NAME_LEN
;
2046 comm_ext_at
+= ext_comm
->nb_exclusions
* LTTNG_SYMBOL_NAME_LEN
;
2048 listing_at
+= ((uintptr_t) listing_at
) % 8;
2051 *events
= (struct lttng_event
*) listing
;
2053 ret
= (int) nb_events
;
2056 free(reception_buffer
);
2062 * Sets the tracing_group variable with name.
2063 * This function allocates memory pointed to by tracing_group.
2064 * On success, returns 0, on error, returns -1 (null name) or -ENOMEM.
2066 int lttng_set_tracing_group(const char *name
)
2069 return -LTTNG_ERR_INVALID
;
2072 if (asprintf(&tracing_group
, "%s", name
) < 0) {
2073 return -LTTNG_ERR_FATAL
;
2079 int lttng_calibrate(struct lttng_handle
*handle
,
2080 struct lttng_calibrate
*calibrate
)
2083 * This command was removed in LTTng 2.9.
2085 return -LTTNG_ERR_UND
;
2089 * Set default channel attributes.
2090 * If either or both of the arguments are null, attr content is zeroe'd.
2092 void lttng_channel_set_default_attr(struct lttng_domain
*domain
,
2093 struct lttng_channel_attr
*attr
)
2095 struct lttng_channel_extended
*extended
;
2098 if (attr
== NULL
|| domain
== NULL
) {
2102 extended
= (struct lttng_channel_extended
*) attr
->extended
.ptr
;
2103 memset(attr
, 0, sizeof(struct lttng_channel_attr
));
2105 /* Same for all domains. */
2106 attr
->overwrite
= DEFAULT_CHANNEL_OVERWRITE
;
2107 attr
->tracefile_size
= DEFAULT_CHANNEL_TRACEFILE_SIZE
;
2108 attr
->tracefile_count
= DEFAULT_CHANNEL_TRACEFILE_COUNT
;
2110 switch (domain
->type
) {
2111 case LTTNG_DOMAIN_KERNEL
:
2112 attr
->switch_timer_interval
=
2113 DEFAULT_KERNEL_CHANNEL_SWITCH_TIMER
;
2114 attr
->read_timer_interval
= DEFAULT_KERNEL_CHANNEL_READ_TIMER
;
2115 attr
->subbuf_size
= default_get_kernel_channel_subbuf_size();
2116 attr
->num_subbuf
= DEFAULT_KERNEL_CHANNEL_SUBBUF_NUM
;
2117 attr
->output
= DEFAULT_KERNEL_CHANNEL_OUTPUT
;
2119 extended
->monitor_timer_interval
=
2120 DEFAULT_KERNEL_CHANNEL_MONITOR_TIMER
;
2121 extended
->blocking_timeout
=
2122 DEFAULT_KERNEL_CHANNEL_BLOCKING_TIMEOUT
;
2125 case LTTNG_DOMAIN_UST
:
2126 switch (domain
->buf_type
) {
2127 case LTTNG_BUFFER_PER_UID
:
2128 attr
->subbuf_size
= default_get_ust_uid_channel_subbuf_size();
2129 attr
->num_subbuf
= DEFAULT_UST_UID_CHANNEL_SUBBUF_NUM
;
2130 attr
->output
= DEFAULT_UST_UID_CHANNEL_OUTPUT
;
2131 attr
->switch_timer_interval
=
2132 DEFAULT_UST_UID_CHANNEL_SWITCH_TIMER
;
2133 attr
->read_timer_interval
=
2134 DEFAULT_UST_UID_CHANNEL_READ_TIMER
;
2136 extended
->monitor_timer_interval
=
2137 DEFAULT_UST_UID_CHANNEL_MONITOR_TIMER
;
2138 extended
->blocking_timeout
=
2139 DEFAULT_UST_UID_CHANNEL_BLOCKING_TIMEOUT
;
2142 case LTTNG_BUFFER_PER_PID
:
2144 attr
->subbuf_size
= default_get_ust_pid_channel_subbuf_size();
2145 attr
->num_subbuf
= DEFAULT_UST_PID_CHANNEL_SUBBUF_NUM
;
2146 attr
->output
= DEFAULT_UST_PID_CHANNEL_OUTPUT
;
2147 attr
->switch_timer_interval
=
2148 DEFAULT_UST_PID_CHANNEL_SWITCH_TIMER
;
2149 attr
->read_timer_interval
=
2150 DEFAULT_UST_PID_CHANNEL_READ_TIMER
;
2152 extended
->monitor_timer_interval
=
2153 DEFAULT_UST_PID_CHANNEL_MONITOR_TIMER
;
2154 extended
->blocking_timeout
=
2155 DEFAULT_UST_PID_CHANNEL_BLOCKING_TIMEOUT
;
2160 /* Default behavior: leave set to 0. */
2164 attr
->extended
.ptr
= extended
;
2167 int lttng_channel_get_discarded_event_count(struct lttng_channel
*channel
,
2168 uint64_t *discarded_events
)
2171 struct lttng_channel_extended
*chan_ext
;
2173 if (!channel
|| !discarded_events
) {
2174 ret
= -LTTNG_ERR_INVALID
;
2178 chan_ext
= channel
->attr
.extended
.ptr
;
2181 * This can happen since the lttng_channel structure is
2182 * used for other tasks where this pointer is never set.
2184 *discarded_events
= 0;
2188 *discarded_events
= chan_ext
->discarded_events
;
2193 int lttng_channel_get_lost_packet_count(struct lttng_channel
*channel
,
2194 uint64_t *lost_packets
)
2197 struct lttng_channel_extended
*chan_ext
;
2199 if (!channel
|| !lost_packets
) {
2200 ret
= -LTTNG_ERR_INVALID
;
2204 chan_ext
= channel
->attr
.extended
.ptr
;
2207 * This can happen since the lttng_channel structure is
2208 * used for other tasks where this pointer is never set.
2214 *lost_packets
= chan_ext
->lost_packets
;
2219 int lttng_channel_get_monitor_timer_interval(struct lttng_channel
*chan
,
2220 uint64_t *monitor_timer_interval
)
2224 if (!chan
|| !monitor_timer_interval
) {
2225 ret
= -LTTNG_ERR_INVALID
;
2229 if (!chan
->attr
.extended
.ptr
) {
2230 ret
= -LTTNG_ERR_INVALID
;
2234 *monitor_timer_interval
= ((struct lttng_channel_extended
*)
2235 chan
->attr
.extended
.ptr
)->monitor_timer_interval
;
2240 int lttng_channel_set_monitor_timer_interval(struct lttng_channel
*chan
,
2241 uint64_t monitor_timer_interval
)
2245 if (!chan
|| !chan
->attr
.extended
.ptr
) {
2246 ret
= -LTTNG_ERR_INVALID
;
2250 ((struct lttng_channel_extended
*)
2251 chan
->attr
.extended
.ptr
)->monitor_timer_interval
=
2252 monitor_timer_interval
;
2257 int lttng_channel_get_blocking_timeout(struct lttng_channel
*chan
,
2258 int64_t *blocking_timeout
)
2262 if (!chan
|| !blocking_timeout
) {
2263 ret
= -LTTNG_ERR_INVALID
;
2267 if (!chan
->attr
.extended
.ptr
) {
2268 ret
= -LTTNG_ERR_INVALID
;
2272 *blocking_timeout
= ((struct lttng_channel_extended
*)
2273 chan
->attr
.extended
.ptr
)->blocking_timeout
;
2278 int lttng_channel_set_blocking_timeout(struct lttng_channel
*chan
,
2279 int64_t blocking_timeout
)
2282 int64_t msec_timeout
;
2284 if (!chan
|| !chan
->attr
.extended
.ptr
) {
2285 ret
= -LTTNG_ERR_INVALID
;
2289 if (blocking_timeout
< 0 && blocking_timeout
!= -1) {
2290 ret
= -LTTNG_ERR_INVALID
;
2295 * LTTng-ust's use of poll() to implement this timeout mechanism forces
2296 * us to accept a narrower range of values (msecs expressed as a signed
2299 msec_timeout
= blocking_timeout
/ 1000;
2300 if (msec_timeout
!= (int32_t) msec_timeout
) {
2301 ret
= -LTTNG_ERR_INVALID
;
2305 ((struct lttng_channel_extended
*)
2306 chan
->attr
.extended
.ptr
)->blocking_timeout
=
2313 * Check if session daemon is alive.
2315 * Return 1 if alive or 0 if not.
2316 * On error returns a negative value.
2318 int lttng_session_daemon_alive(void)
2322 ret
= set_session_daemon_path();
2328 if (*sessiond_sock_path
== '\0') {
2330 * No socket path set. Weird error which means the constructor
2336 ret
= try_connect_sessiond(sessiond_sock_path
);
2347 * Set URL for a consumer for a session and domain.
2349 * Return 0 on success, else a negative value.
2351 int lttng_set_consumer_url(struct lttng_handle
*handle
,
2352 const char *control_url
, const char *data_url
)
2356 struct lttcomm_session_msg lsm
;
2357 struct lttng_uri
*uris
= NULL
;
2359 if (handle
== NULL
|| (control_url
== NULL
&& data_url
== NULL
)) {
2360 return -LTTNG_ERR_INVALID
;
2363 memset(&lsm
, 0, sizeof(lsm
));
2365 lsm
.cmd_type
= LTTNG_SET_CONSUMER_URI
;
2367 lttng_ctl_copy_string(lsm
.session
.name
, handle
->session_name
,
2368 sizeof(lsm
.session
.name
));
2369 lttng_ctl_copy_lttng_domain(&lsm
.domain
, &handle
->domain
);
2371 size
= uri_parse_str_urls(control_url
, data_url
, &uris
);
2373 return -LTTNG_ERR_INVALID
;
2376 lsm
.u
.uri
.size
= size
;
2378 ret
= lttng_ctl_ask_sessiond_varlen_no_cmd_header(&lsm
, uris
,
2379 sizeof(struct lttng_uri
) * size
, NULL
);
2388 int lttng_enable_consumer(struct lttng_handle
*handle
)
2396 int lttng_disable_consumer(struct lttng_handle
*handle
)
2402 * This is an extension of create session that is ONLY and SHOULD only be used
2403 * by the lttng command line program. It exists to avoid using URI parsing in
2406 * We need the date and time for the trace path subdirectory for the case where
2407 * the user does NOT define one using either -o or -U. Using the normal
2408 * lttng_create_session API call, we have no clue on the session daemon side if
2409 * the URL was generated automatically by the client or define by the user.
2411 * So this function "wrapper" is hidden from the public API, takes the datetime
2412 * string and appends it if necessary to the URI subdirectory before sending it
2413 * to the session daemon.
2415 * With this extra function, the lttng_create_session call behavior is not
2416 * changed and the timestamp is appended to the URI on the session daemon side
2419 int _lttng_create_session_ext(const char *name
, const char *url
,
2420 const char *datetime
)
2424 struct lttcomm_session_msg lsm
;
2425 struct lttng_uri
*uris
= NULL
;
2427 if (name
== NULL
|| datetime
== NULL
) {
2428 return -LTTNG_ERR_INVALID
;
2431 memset(&lsm
, 0, sizeof(lsm
));
2433 lsm
.cmd_type
= LTTNG_CREATE_SESSION
;
2434 lttng_ctl_copy_string(lsm
.session
.name
, name
, sizeof(lsm
.session
.name
));
2436 /* There should never be a data URL. */
2437 size
= uri_parse_str_urls(url
, NULL
, &uris
);
2439 ret
= -LTTNG_ERR_INVALID
;
2443 lsm
.u
.uri
.size
= size
;
2445 if (size
> 0 && uris
[0].dtype
!= LTTNG_DST_PATH
&& strlen(uris
[0].subdir
) == 0) {
2446 /* Don't append datetime if the name was automatically created. */
2447 if (strncmp(name
, DEFAULT_SESSION_NAME
"-",
2448 strlen(DEFAULT_SESSION_NAME
) + 1)) {
2449 ret
= snprintf(uris
[0].subdir
, sizeof(uris
[0].subdir
), "%s-%s",
2452 ret
= snprintf(uris
[0].subdir
, sizeof(uris
[0].subdir
), "%s", name
);
2455 PERROR("snprintf uri subdir");
2456 ret
= -LTTNG_ERR_FATAL
;
2461 ret
= lttng_ctl_ask_sessiond_varlen_no_cmd_header(&lsm
, uris
,
2462 sizeof(struct lttng_uri
) * size
, NULL
);
2470 * For a given session name, this call checks if the data is ready to be read
2471 * or is still being extracted by the consumer(s) hence not ready to be used by
2474 int lttng_data_pending(const char *session_name
)
2477 struct lttcomm_session_msg lsm
;
2478 uint8_t *pending
= NULL
;
2480 if (session_name
== NULL
) {
2481 return -LTTNG_ERR_INVALID
;
2484 memset(&lsm
, 0, sizeof(lsm
));
2485 lsm
.cmd_type
= LTTNG_DATA_PENDING
;
2487 lttng_ctl_copy_string(lsm
.session
.name
, session_name
,
2488 sizeof(lsm
.session
.name
));
2490 ret
= lttng_ctl_ask_sessiond(&lsm
, (void **) &pending
);
2493 } else if (ret
!= 1) {
2494 /* Unexpected payload size */
2495 ret
= -LTTNG_ERR_INVALID
;
2499 ret
= (int) *pending
;
2506 * Create a session exclusively used for snapshot.
2508 * Returns LTTNG_OK on success or a negative error code.
2510 int lttng_create_session_snapshot(const char *name
, const char *snapshot_url
)
2514 struct lttcomm_session_msg lsm
;
2515 struct lttng_uri
*uris
= NULL
;
2518 return -LTTNG_ERR_INVALID
;
2521 memset(&lsm
, 0, sizeof(lsm
));
2523 lsm
.cmd_type
= LTTNG_CREATE_SESSION_SNAPSHOT
;
2524 lttng_ctl_copy_string(lsm
.session
.name
, name
, sizeof(lsm
.session
.name
));
2526 size
= uri_parse_str_urls(snapshot_url
, NULL
, &uris
);
2528 return -LTTNG_ERR_INVALID
;
2531 lsm
.u
.uri
.size
= size
;
2534 * If the user does not specify a custom subdir, use the session name.
2536 if (size
> 0 && uris
[0].dtype
!= LTTNG_DST_PATH
&& strlen(uris
[0].subdir
) == 0) {
2537 ret
= snprintf(uris
[0].subdir
, sizeof(uris
[0].subdir
), "%s", name
);
2539 PERROR("snprintf uri subdir");
2540 ret
= -LTTNG_ERR_FATAL
;
2545 ret
= lttng_ctl_ask_sessiond_varlen_no_cmd_header(&lsm
, uris
,
2546 sizeof(struct lttng_uri
) * size
, NULL
);
2554 * Create a session exclusively used for live.
2556 * Returns LTTNG_OK on success or a negative error code.
2558 int lttng_create_session_live(const char *name
, const char *url
,
2559 unsigned int timer_interval
)
2563 struct lttcomm_session_msg lsm
;
2564 struct lttng_uri
*uris
= NULL
;
2566 if (name
== NULL
|| timer_interval
== 0) {
2567 return -LTTNG_ERR_INVALID
;
2570 memset(&lsm
, 0, sizeof(lsm
));
2572 lsm
.cmd_type
= LTTNG_CREATE_SESSION_LIVE
;
2573 lttng_ctl_copy_string(lsm
.session
.name
, name
, sizeof(lsm
.session
.name
));
2576 size
= uri_parse_str_urls(url
, NULL
, &uris
);
2578 ret
= -LTTNG_ERR_INVALID
;
2582 /* file:// is not accepted for live session. */
2583 if (uris
[0].dtype
== LTTNG_DST_PATH
) {
2584 ret
= -LTTNG_ERR_INVALID
;
2591 lsm
.u
.session_live
.nb_uri
= size
;
2592 lsm
.u
.session_live
.timer_interval
= timer_interval
;
2594 ret
= lttng_ctl_ask_sessiond_varlen_no_cmd_header(&lsm
, uris
,
2595 sizeof(struct lttng_uri
) * size
, NULL
);
2603 * List PIDs in the tracker.
2605 * enabled is set to whether the PID tracker is enabled.
2606 * pids is set to an allocated array of PIDs currently tracked. On
2607 * success, pids must be freed by the caller.
2608 * nr_pids is set to the number of entries contained by the pids array.
2610 * Returns 0 on success, else a negative LTTng error code.
2612 int lttng_list_tracker_pids(struct lttng_handle
*handle
,
2613 int *_enabled
, int32_t **_pids
, size_t *_nr_pids
)
2617 struct lttcomm_session_msg lsm
;
2621 if (handle
== NULL
) {
2622 return -LTTNG_ERR_INVALID
;
2625 memset(&lsm
, 0, sizeof(lsm
));
2626 lsm
.cmd_type
= LTTNG_LIST_TRACKER_PIDS
;
2627 lttng_ctl_copy_string(lsm
.session
.name
, handle
->session_name
,
2628 sizeof(lsm
.session
.name
));
2629 lttng_ctl_copy_lttng_domain(&lsm
.domain
, &handle
->domain
);
2631 ret
= lttng_ctl_ask_sessiond(&lsm
, (void **) &pids
);
2635 nr_pids
= ret
/ sizeof(int32_t);
2636 if (nr_pids
== 1 && pids
[0] == -1) {
2642 *_enabled
= enabled
;
2644 *_nr_pids
= nr_pids
;
2649 * Regenerate the metadata for a session.
2650 * Return 0 on success, a negative error code on error.
2652 int lttng_regenerate_metadata(const char *session_name
)
2655 struct lttcomm_session_msg lsm
;
2657 if (!session_name
) {
2658 ret
= -LTTNG_ERR_INVALID
;
2662 memset(&lsm
, 0, sizeof(lsm
));
2663 lsm
.cmd_type
= LTTNG_REGENERATE_METADATA
;
2665 lttng_ctl_copy_string(lsm
.session
.name
, session_name
,
2666 sizeof(lsm
.session
.name
));
2668 ret
= lttng_ctl_ask_sessiond(&lsm
, NULL
);
2679 * Deprecated, replaced by lttng_regenerate_metadata.
2681 int lttng_metadata_regenerate(const char *session_name
)
2683 return lttng_regenerate_metadata(session_name
);
2687 * Regenerate the statedump of a session.
2688 * Return 0 on success, a negative error code on error.
2690 int lttng_regenerate_statedump(const char *session_name
)
2693 struct lttcomm_session_msg lsm
;
2695 if (!session_name
) {
2696 ret
= -LTTNG_ERR_INVALID
;
2700 memset(&lsm
, 0, sizeof(lsm
));
2701 lsm
.cmd_type
= LTTNG_REGENERATE_STATEDUMP
;
2703 lttng_ctl_copy_string(lsm
.session
.name
, session_name
,
2704 sizeof(lsm
.session
.name
));
2706 ret
= lttng_ctl_ask_sessiond(&lsm
, NULL
);
2716 int lttng_register_trigger(struct lttng_trigger
*trigger
)
2719 struct lttcomm_session_msg lsm
;
2720 struct lttng_dynamic_buffer buffer
;
2722 lttng_dynamic_buffer_init(&buffer
);
2724 ret
= -LTTNG_ERR_INVALID
;
2728 if (!lttng_trigger_validate(trigger
)) {
2729 ret
= -LTTNG_ERR_INVALID_TRIGGER
;
2733 ret
= lttng_trigger_serialize(trigger
, &buffer
);
2735 ret
= -LTTNG_ERR_UNK
;
2739 memset(&lsm
, 0, sizeof(lsm
));
2740 lsm
.cmd_type
= LTTNG_REGISTER_TRIGGER
;
2741 lsm
.u
.trigger
.length
= (uint32_t) buffer
.size
;
2742 ret
= lttng_ctl_ask_sessiond_varlen_no_cmd_header(&lsm
, buffer
.data
,
2745 lttng_dynamic_buffer_reset(&buffer
);
2749 int lttng_unregister_trigger(struct lttng_trigger
*trigger
)
2752 struct lttcomm_session_msg lsm
;
2753 struct lttng_dynamic_buffer buffer
;
2755 lttng_dynamic_buffer_init(&buffer
);
2757 ret
= -LTTNG_ERR_INVALID
;
2761 if (!lttng_trigger_validate(trigger
)) {
2762 ret
= -LTTNG_ERR_INVALID_TRIGGER
;
2766 ret
= lttng_trigger_serialize(trigger
, &buffer
);
2768 ret
= -LTTNG_ERR_UNK
;
2772 memset(&lsm
, 0, sizeof(lsm
));
2773 lsm
.cmd_type
= LTTNG_UNREGISTER_TRIGGER
;
2774 lsm
.u
.trigger
.length
= (uint32_t) buffer
.size
;
2775 ret
= lttng_ctl_ask_sessiond_varlen_no_cmd_header(&lsm
, buffer
.data
,
2778 lttng_dynamic_buffer_reset(&buffer
);
2782 int lttng_session_get_current_archive_location(const char *session_name
,
2785 struct lttcomm_session_msg lsm
;
2786 struct lttng_session_get_current_output_return
*output_return
= NULL
;
2790 memset(&lsm
, 0, sizeof(lsm
));
2791 lsm
.cmd_type
= LTTNG_SESSION_GET_CURRENT_OUTPUT
;
2792 ret
= lttng_strncpy(lsm
.session
.name
, session_name
,
2793 sizeof(lsm
.session
.name
));
2795 ret
= -LTTNG_ERR_INVALID
;
2799 ret
= lttng_ctl_ask_sessiond(&lsm
, (void **) &output_return
);
2805 path_len
= lttng_strnlen(output_return
->path
,
2806 sizeof(output_return
->path
));
2807 if (path_len
== 0 || path_len
== sizeof(output_return
->path
)) {
2808 ret
= -LTTNG_ERR_NO_SESSION_OUTPUT
;
2812 *chunk_path
= zmalloc(path_len
+ 1);
2817 memcpy(*chunk_path
, output_return
->path
, path_len
);
2822 free(output_return
);
2829 static void __attribute__((constructor
)) init(void)
2831 /* Set default session group */
2832 lttng_set_tracing_group(DEFAULT_TRACING_GROUP
);
2838 static void __attribute__((destructor
)) lttng_ctl_exit(void)
2840 free(tracing_group
);