6 * Copyright (C) 2010-2012 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
8 * This library is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU Lesser General Public
10 * License as published by the Free Software Foundation; only
11 * version 2.1 of the License.
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
19 * License along with this library; if not, write to the Free Software
20 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
23 * Mimic system calls for:
24 * - session creation, returns an object descriptor or failure.
25 * - channel creation, returns an object descriptor or failure.
26 * - Operates on a session object descriptor
27 * - Takes all channel options as parameters.
28 * - stream get, returns an object descriptor or failure.
29 * - Operates on a channel object descriptor.
30 * - stream notifier get, returns an object descriptor or failure.
31 * - Operates on a channel object descriptor.
32 * - event creation, returns an object descriptor or failure.
33 * - Operates on a channel object descriptor
34 * - Takes an event name as parameter
35 * - Takes an instrumentation source as parameter
36 * - e.g. tracepoints, dynamic_probes...
37 * - Takes instrumentation source specific arguments.
40 #include <lttng/ust-abi.h>
41 #include <urcu/compiler.h>
42 #include <urcu/list.h>
43 #include <lttng/ust-events.h>
44 #include <lttng/ust-version.h>
45 #include <lttng/tracepoint.h>
46 #include "tracepoint-internal.h"
47 #include <usterr-signal-safe.h>
49 #include "ltt-tracer.h"
51 static int lttng_ust_abi_close_in_progress
;
54 int lttng_abi_tracepoint_list(void);
57 * Object descriptor table. Should be protected from concurrent access
61 struct lttng_ust_obj
{
65 const struct lttng_ust_objd_ops
*ops
;
68 int freelist_next
; /* offset freelist. end is -1. */
72 struct lttng_ust_objd_table
{
73 struct lttng_ust_obj
*array
;
74 unsigned int len
, allocated_len
;
75 int freelist_head
; /* offset freelist head. end is -1 */
78 static struct lttng_ust_objd_table objd_table
= {
83 int objd_alloc(void *private_data
, const struct lttng_ust_objd_ops
*ops
)
85 struct lttng_ust_obj
*obj
;
87 if (objd_table
.freelist_head
!= -1) {
88 obj
= &objd_table
.array
[objd_table
.freelist_head
];
89 objd_table
.freelist_head
= obj
->u
.freelist_next
;
93 if (objd_table
.len
>= objd_table
.allocated_len
) {
94 unsigned int new_allocated_len
, old_allocated_len
;
95 struct lttng_ust_obj
*new_table
, *old_table
;
97 old_allocated_len
= objd_table
.allocated_len
;
98 old_table
= objd_table
.array
;
99 if (!old_allocated_len
)
100 new_allocated_len
= 1;
102 new_allocated_len
= old_allocated_len
<< 1;
103 new_table
= zmalloc(sizeof(struct lttng_ust_obj
) * new_allocated_len
);
106 memcpy(new_table
, old_table
,
107 sizeof(struct lttng_ust_obj
) * old_allocated_len
);
109 objd_table
.array
= new_table
;
110 objd_table
.allocated_len
= new_allocated_len
;
112 obj
= &objd_table
.array
[objd_table
.len
];
115 obj
->u
.s
.private_data
= private_data
;
117 obj
->u
.s
.f_count
= 2; /* count == 1 : object is allocated */
118 /* count == 2 : allocated + hold ref */
119 return obj
- objd_table
.array
;
123 struct lttng_ust_obj
*_objd_get(int id
)
125 if (id
>= objd_table
.len
)
127 if (!objd_table
.array
[id
].u
.s
.f_count
)
129 return &objd_table
.array
[id
];
133 void *objd_private(int id
)
135 struct lttng_ust_obj
*obj
= _objd_get(id
);
137 return obj
->u
.s
.private_data
;
141 void objd_set_private(int id
, void *private_data
)
143 struct lttng_ust_obj
*obj
= _objd_get(id
);
145 obj
->u
.s
.private_data
= private_data
;
148 const struct lttng_ust_objd_ops
*objd_ops(int id
)
150 struct lttng_ust_obj
*obj
= _objd_get(id
);
158 void objd_free(int id
)
160 struct lttng_ust_obj
*obj
= _objd_get(id
);
163 obj
->u
.freelist_next
= objd_table
.freelist_head
;
164 objd_table
.freelist_head
= obj
- objd_table
.array
;
165 assert(obj
->u
.s
.f_count
== 1);
166 obj
->u
.s
.f_count
= 0; /* deallocated */
170 void objd_ref(int id
)
172 struct lttng_ust_obj
*obj
= _objd_get(id
);
176 int lttng_ust_objd_unref(int id
)
178 struct lttng_ust_obj
*obj
= _objd_get(id
);
182 if (obj
->u
.s
.f_count
== 1) {
183 ERR("Reference counting error\n");
186 if ((--obj
->u
.s
.f_count
) == 1) {
187 const struct lttng_ust_objd_ops
*ops
= objd_ops(id
);
197 void objd_table_destroy(void)
201 for (i
= 0; i
< objd_table
.allocated_len
; i
++)
202 (void) lttng_ust_objd_unref(i
);
203 free(objd_table
.array
);
204 objd_table
.array
= NULL
;
206 objd_table
.allocated_len
= 0;
207 objd_table
.freelist_head
= -1;
211 * This is LTTng's own personal way to create an ABI for sessiond.
212 * We send commands over a socket.
215 static const struct lttng_ust_objd_ops lttng_ops
;
216 static const struct lttng_ust_objd_ops lttng_session_ops
;
217 static const struct lttng_ust_objd_ops lttng_channel_ops
;
218 static const struct lttng_ust_objd_ops lttng_metadata_ops
;
219 static const struct lttng_ust_objd_ops lttng_event_ops
;
220 static const struct lttng_ust_objd_ops lttng_wildcard_ops
;
221 static const struct lttng_ust_objd_ops lib_ring_buffer_objd_ops
;
222 static const struct lttng_ust_objd_ops lttng_tracepoint_list_ops
;
229 int lttng_abi_create_root_handle(void)
233 root_handle
= objd_alloc(NULL
, <tng_ops
);
238 int lttng_abi_create_session(void)
240 struct ltt_session
*session
;
241 int session_objd
, ret
;
243 session
= ltt_session_create();
246 session_objd
= objd_alloc(session
, <tng_session_ops
);
247 if (session_objd
< 0) {
251 session
->objd
= session_objd
;
255 ltt_session_destroy(session
);
260 long lttng_abi_tracer_version(int objd
,
261 struct lttng_ust_tracer_version
*v
)
263 v
->major
= LTTNG_UST_MAJOR_VERSION
;
264 v
->minor
= LTTNG_UST_MINOR_VERSION
;
265 v
->patchlevel
= LTTNG_UST_PATCHLEVEL_VERSION
;
270 long lttng_abi_add_context(int objd
,
271 struct lttng_ust_context
*context_param
,
272 struct lttng_ctx
**ctx
, struct ltt_session
*session
)
274 if (session
->been_active
)
277 switch (context_param
->ctx
) {
278 case LTTNG_UST_CONTEXT_PTHREAD_ID
:
279 return lttng_add_pthread_id_to_ctx(ctx
);
280 case LTTNG_UST_CONTEXT_VTID
:
281 return lttng_add_vtid_to_ctx(ctx
);
282 case LTTNG_UST_CONTEXT_VPID
:
283 return lttng_add_vpid_to_ctx(ctx
);
284 case LTTNG_UST_CONTEXT_PROCNAME
:
285 return lttng_add_procname_to_ctx(ctx
);
292 * lttng_cmd - lttng control through socket commands
294 * @objd: the object descriptor
297 * @uargs: UST arguments (internal)
299 * This descriptor implements lttng commands:
301 * Returns a LTTng trace session object descriptor
302 * LTTNG_UST_TRACER_VERSION
303 * Returns the LTTng kernel tracer version
304 * LTTNG_UST_TRACEPOINT_LIST
305 * Returns a file descriptor listing available tracepoints
306 * LTTNG_UST_WAIT_QUIESCENT
307 * Returns after all previously running probes have completed
309 * The returned session will be deleted when its file descriptor is closed.
312 long lttng_cmd(int objd
, unsigned int cmd
, unsigned long arg
,
313 union ust_args
*uargs
)
316 case LTTNG_UST_SESSION
:
317 return lttng_abi_create_session();
318 case LTTNG_UST_TRACER_VERSION
:
319 return lttng_abi_tracer_version(objd
,
320 (struct lttng_ust_tracer_version
*) arg
);
321 case LTTNG_UST_TRACEPOINT_LIST
:
322 return lttng_abi_tracepoint_list();
323 case LTTNG_UST_WAIT_QUIESCENT
:
331 static const struct lttng_ust_objd_ops lttng_ops
= {
336 * We tolerate no failure in this function (if one happens, we print a dmesg
337 * error, but cannot return any error, because the channel information is
341 void lttng_metadata_create_events(int channel_objd
)
343 struct ltt_channel
*channel
= objd_private(channel_objd
);
344 static struct lttng_ust_event metadata_params
= {
345 .instrumentation
= LTTNG_UST_TRACEPOINT
,
346 .name
= "lttng_ust:metadata",
347 .loglevel_type
= LTTNG_UST_LOGLEVEL_ALL
,
348 .loglevel
= TRACE_DEFAULT
,
350 struct ltt_event
*event
;
354 * We tolerate no failure path after event creation. It will stay
355 * invariant for the rest of the session.
357 ret
= ltt_event_create(channel
, &metadata_params
, NULL
, &event
);
365 return; /* not allowed to return error */
368 int lttng_abi_create_channel(int session_objd
,
369 struct lttng_ust_channel
*chan_param
,
370 enum channel_type channel_type
,
371 union ust_args
*uargs
)
373 struct ltt_session
*session
= objd_private(session_objd
);
374 const struct lttng_ust_objd_ops
*ops
;
375 const char *transport_name
;
376 struct ltt_channel
*chan
;
379 struct ltt_channel chan_priv_init
;
381 switch (channel_type
) {
382 case PER_CPU_CHANNEL
:
383 if (chan_param
->output
== LTTNG_UST_MMAP
) {
384 transport_name
= chan_param
->overwrite
?
385 "relay-overwrite-mmap" : "relay-discard-mmap";
389 ops
= <tng_channel_ops
;
391 case METADATA_CHANNEL
:
392 if (chan_param
->output
== LTTNG_UST_MMAP
)
393 transport_name
= "relay-metadata-mmap";
396 ops
= <tng_metadata_ops
;
399 transport_name
= "<unknown>";
402 chan_objd
= objd_alloc(NULL
, ops
);
407 memset(&chan_priv_init
, 0, sizeof(chan_priv_init
));
408 /* Copy of session UUID for consumer (availability through shm) */
409 memcpy(chan_priv_init
.uuid
, session
->uuid
, sizeof(session
->uuid
));
412 * We tolerate no failure path after channel creation. It will stay
413 * invariant for the rest of the session.
415 chan
= ltt_channel_create(session
, transport_name
, NULL
,
416 chan_param
->subbuf_size
,
417 chan_param
->num_subbuf
,
418 chan_param
->switch_timer_interval
,
419 chan_param
->read_timer_interval
,
420 &uargs
->channel
.shm_fd
,
421 &uargs
->channel
.wait_fd
,
422 &uargs
->channel
.memory_map_size
,
428 objd_set_private(chan_objd
, chan
);
429 chan
->objd
= chan_objd
;
430 if (channel_type
== METADATA_CHANNEL
) {
431 session
->metadata
= chan
;
432 lttng_metadata_create_events(chan_objd
);
434 /* The channel created holds a reference on the session */
435 objd_ref(session_objd
);
443 err
= lttng_ust_objd_unref(chan_objd
);
451 * lttng_session_cmd - lttng session object command
456 * @uargs: UST arguments (internal)
458 * This descriptor implements lttng commands:
460 * Returns a LTTng channel object descriptor
462 * Enables tracing for a session (weak enable)
464 * Disables tracing for a session (strong disable)
466 * Returns a LTTng metadata object descriptor
468 * The returned channel will be deleted when its file descriptor is closed.
471 long lttng_session_cmd(int objd
, unsigned int cmd
, unsigned long arg
,
472 union ust_args
*uargs
)
474 struct ltt_session
*session
= objd_private(objd
);
477 case LTTNG_UST_CHANNEL
:
478 return lttng_abi_create_channel(objd
,
479 (struct lttng_ust_channel
*) arg
,
480 PER_CPU_CHANNEL
, uargs
);
481 case LTTNG_UST_SESSION_START
:
482 case LTTNG_UST_ENABLE
:
483 return ltt_session_enable(session
);
484 case LTTNG_UST_SESSION_STOP
:
485 case LTTNG_UST_DISABLE
:
486 return ltt_session_disable(session
);
487 case LTTNG_UST_METADATA
:
488 return lttng_abi_create_channel(objd
,
489 (struct lttng_ust_channel
*) arg
,
490 METADATA_CHANNEL
, uargs
);
497 * Called when the last file reference is dropped.
499 * Big fat note: channels and events are invariant for the whole session after
500 * their creation. So this session destruction also destroys all channel and
501 * event structures specific to this session (they are not destroyed when their
502 * individual file is released).
505 int lttng_release_session(int objd
)
507 struct ltt_session
*session
= objd_private(objd
);
510 ltt_session_destroy(session
);
517 static const struct lttng_ust_objd_ops lttng_session_ops
= {
518 .release
= lttng_release_session
,
519 .cmd
= lttng_session_cmd
,
523 long lttng_tracepoint_list_cmd(int objd
, unsigned int cmd
, unsigned long arg
,
524 union ust_args
*uargs
)
526 struct lttng_ust_tracepoint_list
*list
= objd_private(objd
);
527 struct lttng_ust_tracepoint_iter
*tp
=
528 (struct lttng_ust_tracepoint_iter
*) arg
;
529 struct lttng_ust_tracepoint_iter
*iter
;
532 case LTTNG_UST_TRACEPOINT_LIST_GET
:
535 iter
= lttng_ust_tracepoint_list_get_iter_next(list
);
538 if (!strcmp(iter
->name
, "lttng_ust:metadata"))
540 memcpy(tp
, iter
, sizeof(*tp
));
549 int lttng_abi_tracepoint_list(void)
552 struct lttng_ust_tracepoint_list
*list
;
554 list_objd
= objd_alloc(NULL
, <tng_tracepoint_list_ops
);
559 list
= zmalloc(sizeof(*list
));
564 objd_set_private(list_objd
, list
);
566 /* populate list by walking on all registered probes. */
567 ret
= ltt_probes_get_event_list(list
);
579 err
= lttng_ust_objd_unref(list_objd
);
587 int lttng_release_tracepoint_list(int objd
)
589 struct lttng_ust_tracepoint_list
*list
= objd_private(objd
);
592 ltt_probes_prune_event_list(list
);
600 static const struct lttng_ust_objd_ops lttng_tracepoint_list_ops
= {
601 .release
= lttng_release_tracepoint_list
,
602 .cmd
= lttng_tracepoint_list_cmd
,
605 struct stream_priv_data
{
606 struct lttng_ust_lib_ring_buffer
*buf
;
607 struct ltt_channel
*ltt_chan
;
611 int lttng_abi_open_stream(int channel_objd
, struct lttng_ust_stream
*info
,
612 union ust_args
*uargs
)
614 struct ltt_channel
*channel
= objd_private(channel_objd
);
615 struct lttng_ust_lib_ring_buffer
*buf
;
616 struct stream_priv_data
*priv
;
617 int stream_objd
, ret
;
619 buf
= channel
->ops
->buffer_read_open(channel
->chan
, channel
->handle
,
620 &uargs
->stream
.shm_fd
,
621 &uargs
->stream
.wait_fd
,
622 &uargs
->stream
.memory_map_size
);
626 priv
= zmalloc(sizeof(*priv
));
632 priv
->ltt_chan
= channel
;
633 stream_objd
= objd_alloc(priv
, &lib_ring_buffer_objd_ops
);
634 if (stream_objd
< 0) {
638 /* Hold a reference on the channel object descriptor */
639 objd_ref(channel_objd
);
645 channel
->ops
->buffer_read_close(buf
, channel
->handle
);
650 int lttng_abi_create_event(int channel_objd
,
651 struct lttng_ust_event
*event_param
)
653 struct ltt_channel
*channel
= objd_private(channel_objd
);
654 struct ltt_event
*event
;
657 event_param
->name
[LTTNG_UST_SYM_NAME_LEN
- 1] = '\0';
658 event_objd
= objd_alloc(NULL
, <tng_event_ops
);
659 if (event_objd
< 0) {
664 * We tolerate no failure path after event creation. It will stay
665 * invariant for the rest of the session.
667 ret
= ltt_event_create(channel
, event_param
, NULL
, &event
);
671 objd_set_private(event_objd
, event
);
672 /* The event holds a reference on the channel */
673 objd_ref(channel_objd
);
680 err
= lttng_ust_objd_unref(event_objd
);
688 int lttng_abi_create_wildcard(int channel_objd
,
689 struct lttng_ust_event
*event_param
)
691 struct ltt_channel
*channel
= objd_private(channel_objd
);
692 struct session_wildcard
*wildcard
;
693 int wildcard_objd
, ret
;
695 event_param
->name
[LTTNG_UST_SYM_NAME_LEN
- 1] = '\0';
696 wildcard_objd
= objd_alloc(NULL
, <tng_wildcard_ops
);
697 if (wildcard_objd
< 0) {
702 * We tolerate no failure path after wildcard creation. It will
703 * stay invariant for the rest of the session.
705 ret
= ltt_wildcard_create(channel
, event_param
, &wildcard
);
709 objd_set_private(wildcard_objd
, wildcard
);
710 /* The wildcard holds a reference on the channel */
711 objd_ref(channel_objd
);
712 return wildcard_objd
;
718 err
= lttng_ust_objd_unref(wildcard_objd
);
726 * lttng_channel_cmd - lttng control through object descriptors
728 * @objd: the object descriptor
731 * @uargs: UST arguments (internal)
733 * This object descriptor implements lttng commands:
735 * Returns an event stream object descriptor or failure.
736 * (typically, one event stream records events from one CPU)
738 * Returns an event object descriptor or failure.
740 * Prepend a context field to each event in the channel
742 * Enable recording for events in this channel (weak enable)
744 * Disable recording for events in this channel (strong disable)
746 * Channel and event file descriptors also hold a reference on the session.
749 long lttng_channel_cmd(int objd
, unsigned int cmd
, unsigned long arg
,
750 union ust_args
*uargs
)
752 struct ltt_channel
*channel
= objd_private(objd
);
755 case LTTNG_UST_STREAM
:
757 struct lttng_ust_stream
*stream
;
759 stream
= (struct lttng_ust_stream
*) arg
;
760 /* stream used as output */
761 return lttng_abi_open_stream(objd
, stream
, uargs
);
763 case LTTNG_UST_EVENT
:
765 struct lttng_ust_event
*event_param
=
766 (struct lttng_ust_event
*) arg
;
767 if (event_param
->name
[strlen(event_param
->name
) - 1] == '*') {
768 /* If ends with wildcard, create wildcard. */
769 return lttng_abi_create_wildcard(objd
, event_param
);
771 return lttng_abi_create_event(objd
, event_param
);
774 case LTTNG_UST_CONTEXT
:
775 return lttng_abi_add_context(objd
,
776 (struct lttng_ust_context
*) arg
,
777 &channel
->ctx
, channel
->session
);
778 case LTTNG_UST_ENABLE
:
779 return ltt_channel_enable(channel
);
780 case LTTNG_UST_DISABLE
:
781 return ltt_channel_disable(channel
);
782 case LTTNG_UST_FLUSH_BUFFER
:
783 return channel
->ops
->flush_buffer(channel
->chan
, channel
->handle
);
790 * lttng_metadata_cmd - lttng control through object descriptors
792 * @objd: the object descriptor
795 * @uargs: UST arguments (internal)
797 * This object descriptor implements lttng commands:
799 * Returns an event stream file descriptor or failure.
801 * Channel and event file descriptors also hold a reference on the session.
804 long lttng_metadata_cmd(int objd
, unsigned int cmd
, unsigned long arg
,
805 union ust_args
*uargs
)
807 struct ltt_channel
*channel
= objd_private(objd
);
810 case LTTNG_UST_STREAM
:
812 struct lttng_ust_stream
*stream
;
814 stream
= (struct lttng_ust_stream
*) arg
;
815 /* stream used as output */
816 return lttng_abi_open_stream(objd
, stream
, uargs
);
818 case LTTNG_UST_FLUSH_BUFFER
:
819 return channel
->ops
->flush_buffer(channel
->chan
, channel
->handle
);
827 * lttng_channel_poll - lttng stream addition/removal monitoring
832 unsigned int lttng_channel_poll(struct file
*file
, poll_table
*wait
)
834 struct ltt_channel
*channel
= file
->private_data
;
835 unsigned int mask
= 0;
837 if (file
->f_mode
& FMODE_READ
) {
838 poll_wait_set_exclusive(wait
);
839 poll_wait(file
, channel
->ops
->get_hp_wait_queue(channel
->chan
),
842 if (channel
->ops
->is_disabled(channel
->chan
))
844 if (channel
->ops
->is_finalized(channel
->chan
))
846 if (channel
->ops
->buffer_has_read_closed_stream(channel
->chan
))
847 return POLLIN
| POLLRDNORM
;
856 int lttng_channel_release(int objd
)
858 struct ltt_channel
*channel
= objd_private(objd
);
861 return lttng_ust_objd_unref(channel
->session
->objd
);
865 static const struct lttng_ust_objd_ops lttng_channel_ops
= {
866 .release
= lttng_channel_release
,
867 //.poll = lttng_channel_poll,
868 .cmd
= lttng_channel_cmd
,
871 static const struct lttng_ust_objd_ops lttng_metadata_ops
= {
872 .release
= lttng_channel_release
,
873 .cmd
= lttng_metadata_cmd
,
877 * lttng_rb_cmd - lttng ring buffer control through object descriptors
879 * @objd: the object descriptor
882 * @uargs: UST arguments (internal)
884 * This object descriptor implements lttng commands:
885 * (None for now. Access is done directly though shm.)
888 long lttng_rb_cmd(int objd
, unsigned int cmd
, unsigned long arg
,
889 union ust_args
*uargs
)
898 int lttng_rb_release(int objd
)
900 struct stream_priv_data
*priv
= objd_private(objd
);
901 struct lttng_ust_lib_ring_buffer
*buf
;
902 struct ltt_channel
*channel
;
906 channel
= priv
->ltt_chan
;
909 * If we are at ABI exit, we don't want to close the
910 * buffer opened for read: it is being shared between
911 * the parent and child (right after fork), and we don't
912 * want the child to close it for the parent. For a real
913 * exit, we don't care about marking it as closed, as
914 * the consumer daemon (if there is one) will do fine
915 * even if we don't mark it as "closed" for reading on
917 * We only mark it as closed if it is being explicitely
918 * released by the session daemon with an explicit
921 if (!lttng_ust_abi_close_in_progress
)
922 channel
->ops
->buffer_read_close(buf
, channel
->handle
);
924 return lttng_ust_objd_unref(channel
->objd
);
929 static const struct lttng_ust_objd_ops lib_ring_buffer_objd_ops
= {
930 .release
= lttng_rb_release
,
935 * lttng_event_cmd - lttng control through object descriptors
937 * @objd: the object descriptor
940 * @uargs: UST arguments (internal)
942 * This object descriptor implements lttng commands:
944 * Prepend a context field to each record of this event
946 * Enable recording for this event (weak enable)
948 * Disable recording for this event (strong disable)
951 long lttng_event_cmd(int objd
, unsigned int cmd
, unsigned long arg
,
952 union ust_args
*uargs
)
954 struct ltt_event
*event
= objd_private(objd
);
957 case LTTNG_UST_CONTEXT
:
958 return lttng_abi_add_context(objd
,
959 (struct lttng_ust_context
*) arg
,
960 &event
->ctx
, event
->chan
->session
);
961 case LTTNG_UST_ENABLE
:
962 return ltt_event_enable(event
);
963 case LTTNG_UST_DISABLE
:
964 return ltt_event_disable(event
);
971 int lttng_event_release(int objd
)
973 struct ltt_event
*event
= objd_private(objd
);
976 return lttng_ust_objd_unref(event
->chan
->objd
);
980 /* TODO: filter control ioctl */
981 static const struct lttng_ust_objd_ops lttng_event_ops
= {
982 .release
= lttng_event_release
,
983 .cmd
= lttng_event_cmd
,
987 * lttng_wildcard_cmd - lttng control through object descriptors
989 * @objd: the object descriptor
992 * @uargs: UST arguments (internal)
994 * This object descriptor implements lttng commands:
996 * Prepend a context field to each record of events of this
999 * Enable recording for these wildcard events (weak enable)
1001 * Disable recording for these wildcard events (strong disable)
1004 long lttng_wildcard_cmd(int objd
, unsigned int cmd
, unsigned long arg
,
1005 union ust_args
*uargs
)
1007 struct session_wildcard
*wildcard
= objd_private(objd
);
1010 case LTTNG_UST_CONTEXT
:
1011 return -ENOSYS
; /* not implemented yet */
1013 return lttng_abi_add_context(objd
,
1014 (struct lttng_ust_context
*) arg
,
1015 &wildcard
->ctx
, wildcard
->chan
->session
);
1017 case LTTNG_UST_ENABLE
:
1018 return ltt_wildcard_enable(wildcard
);
1019 case LTTNG_UST_DISABLE
:
1020 return ltt_wildcard_disable(wildcard
);
1027 int lttng_wildcard_release(int objd
)
1029 struct session_wildcard
*wildcard
= objd_private(objd
);
1032 return lttng_ust_objd_unref(wildcard
->chan
->objd
);
1036 /* TODO: filter control ioctl */
1037 static const struct lttng_ust_objd_ops lttng_wildcard_ops
= {
1038 .release
= lttng_wildcard_release
,
1039 .cmd
= lttng_wildcard_cmd
,
1042 void lttng_ust_abi_exit(void)
1044 lttng_ust_abi_close_in_progress
= 1;
1045 objd_table_destroy();
1046 lttng_ust_abi_close_in_progress
= 0;