2 * SPDX-License-Identifier: LGPL-2.1-only
4 * Copyright (C) 2010-2012 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
8 * Mimic system calls for:
9 * - session creation, returns an object descriptor or failure.
10 * - channel creation, returns an object descriptor or failure.
11 * - Operates on a session object descriptor
12 * - Takes all channel options as parameters.
13 * - stream get, returns an object descriptor or failure.
14 * - Operates on a channel object descriptor.
15 * - stream notifier get, returns an object descriptor or failure.
16 * - Operates on a channel object descriptor.
17 * - event creation, returns an object descriptor or failure.
18 * - Operates on a channel object descriptor
19 * - Takes an event name as parameter
20 * - Takes an instrumentation source as parameter
21 * - e.g. tracepoints, dynamic_probes...
22 * - Takes instrumentation source specific arguments.
30 #include <urcu/compiler.h>
31 #include <urcu/list.h>
33 #include <lttng/tracepoint.h>
34 #include <lttng/ust-abi.h>
35 #include <lttng/ust-error.h>
36 #include <lttng/ust-events.h>
37 #include <lttng/ust-version.h>
39 #include <usterr-signal-safe.h>
41 #include "../libringbuffer/frontend_types.h"
42 #include "../libringbuffer/shm.h"
43 #include "../libcounter/counter.h"
44 #include "tracepoint-internal.h"
45 #include "lttng-tracer.h"
46 #include "string-utils.h"
47 #include "ust-events-internal.h"
48 #include "context-internal.h"
49 #include "ust-helper.h"
51 #define OBJ_NAME_LEN 16
53 static int lttng_ust_abi_close_in_progress
;
56 int lttng_abi_tracepoint_list(void *owner
);
58 int lttng_abi_tracepoint_field_list(void *owner
);
61 * Object descriptor table. Should be protected from concurrent access
65 struct lttng_ust_abi_obj
{
69 const struct lttng_ust_abi_objd_ops
*ops
;
71 int owner_ref
; /* has ref from owner */
73 char name
[OBJ_NAME_LEN
];
75 int freelist_next
; /* offset freelist. end is -1. */
79 struct lttng_ust_abi_objd_table
{
80 struct lttng_ust_abi_obj
*array
;
81 unsigned int len
, allocated_len
;
82 int freelist_head
; /* offset freelist head. end is -1 */
85 static struct lttng_ust_abi_objd_table objd_table
= {
90 int objd_alloc(void *private_data
, const struct lttng_ust_abi_objd_ops
*ops
,
91 void *owner
, const char *name
)
93 struct lttng_ust_abi_obj
*obj
;
95 if (objd_table
.freelist_head
!= -1) {
96 obj
= &objd_table
.array
[objd_table
.freelist_head
];
97 objd_table
.freelist_head
= obj
->u
.freelist_next
;
101 if (objd_table
.len
>= objd_table
.allocated_len
) {
102 unsigned int new_allocated_len
, old_allocated_len
;
103 struct lttng_ust_abi_obj
*new_table
, *old_table
;
105 old_allocated_len
= objd_table
.allocated_len
;
106 old_table
= objd_table
.array
;
107 if (!old_allocated_len
)
108 new_allocated_len
= 1;
110 new_allocated_len
= old_allocated_len
<< 1;
111 new_table
= zmalloc(sizeof(struct lttng_ust_abi_obj
) * new_allocated_len
);
114 memcpy(new_table
, old_table
,
115 sizeof(struct lttng_ust_abi_obj
) * old_allocated_len
);
117 objd_table
.array
= new_table
;
118 objd_table
.allocated_len
= new_allocated_len
;
120 obj
= &objd_table
.array
[objd_table
.len
];
123 obj
->u
.s
.private_data
= private_data
;
125 obj
->u
.s
.f_count
= 2; /* count == 1 : object is allocated */
126 /* count == 2 : allocated + hold ref */
127 obj
->u
.s
.owner_ref
= 1; /* One owner reference */
128 obj
->u
.s
.owner
= owner
;
129 strncpy(obj
->u
.s
.name
, name
, OBJ_NAME_LEN
);
130 obj
->u
.s
.name
[OBJ_NAME_LEN
- 1] = '\0';
131 return obj
- objd_table
.array
;
135 struct lttng_ust_abi_obj
*_objd_get(int id
)
137 if (id
>= objd_table
.len
)
139 if (!objd_table
.array
[id
].u
.s
.f_count
)
141 return &objd_table
.array
[id
];
145 void *objd_private(int id
)
147 struct lttng_ust_abi_obj
*obj
= _objd_get(id
);
149 return obj
->u
.s
.private_data
;
153 void objd_set_private(int id
, void *private_data
)
155 struct lttng_ust_abi_obj
*obj
= _objd_get(id
);
157 obj
->u
.s
.private_data
= private_data
;
160 const struct lttng_ust_abi_objd_ops
*lttng_ust_abi_objd_ops(int id
)
162 struct lttng_ust_abi_obj
*obj
= _objd_get(id
);
170 void objd_free(int id
)
172 struct lttng_ust_abi_obj
*obj
= _objd_get(id
);
175 obj
->u
.freelist_next
= objd_table
.freelist_head
;
176 objd_table
.freelist_head
= obj
- objd_table
.array
;
177 assert(obj
->u
.s
.f_count
== 1);
178 obj
->u
.s
.f_count
= 0; /* deallocated */
182 void objd_ref(int id
)
184 struct lttng_ust_abi_obj
*obj
= _objd_get(id
);
189 int lttng_ust_abi_objd_unref(int id
, int is_owner
)
191 struct lttng_ust_abi_obj
*obj
= _objd_get(id
);
195 if (obj
->u
.s
.f_count
== 1) {
196 ERR("Reference counting error\n");
200 if (!obj
->u
.s
.owner_ref
) {
201 ERR("Error decrementing owner reference");
204 obj
->u
.s
.owner_ref
--;
206 if ((--obj
->u
.s
.f_count
) == 1) {
207 const struct lttng_ust_abi_objd_ops
*ops
= lttng_ust_abi_objd_ops(id
);
217 void objd_table_destroy(void)
221 for (i
= 0; i
< objd_table
.allocated_len
; i
++) {
222 struct lttng_ust_abi_obj
*obj
;
227 if (!obj
->u
.s
.owner_ref
)
228 continue; /* only unref owner ref. */
229 (void) lttng_ust_abi_objd_unref(i
, 1);
231 free(objd_table
.array
);
232 objd_table
.array
= NULL
;
234 objd_table
.allocated_len
= 0;
235 objd_table
.freelist_head
= -1;
238 const char *lttng_ust_obj_get_name(int id
)
240 struct lttng_ust_abi_obj
*obj
= _objd_get(id
);
244 return obj
->u
.s
.name
;
247 void lttng_ust_abi_objd_table_owner_cleanup(void *owner
)
251 for (i
= 0; i
< objd_table
.allocated_len
; i
++) {
252 struct lttng_ust_abi_obj
*obj
;
258 continue; /* skip root handles */
259 if (!obj
->u
.s
.owner_ref
)
260 continue; /* only unref owner ref. */
261 if (obj
->u
.s
.owner
== owner
)
262 (void) lttng_ust_abi_objd_unref(i
, 1);
267 * This is LTTng's own personal way to create an ABI for sessiond.
268 * We send commands over a socket.
271 static const struct lttng_ust_abi_objd_ops lttng_ops
;
272 static const struct lttng_ust_abi_objd_ops lttng_event_notifier_group_ops
;
273 static const struct lttng_ust_abi_objd_ops lttng_session_ops
;
274 static const struct lttng_ust_abi_objd_ops lttng_channel_ops
;
275 static const struct lttng_ust_abi_objd_ops lttng_event_enabler_ops
;
276 static const struct lttng_ust_abi_objd_ops lttng_event_notifier_enabler_ops
;
277 static const struct lttng_ust_abi_objd_ops lttng_tracepoint_list_ops
;
278 static const struct lttng_ust_abi_objd_ops lttng_tracepoint_field_list_ops
;
280 int lttng_abi_create_root_handle(void)
284 /* root handles have NULL owners */
285 root_handle
= objd_alloc(NULL
, <tng_ops
, NULL
, "root");
290 int lttng_is_channel_ready(struct lttng_ust_channel_buffer
*lttng_chan
)
292 struct lttng_ust_lib_ring_buffer_channel
*chan
;
293 unsigned int nr_streams
, exp_streams
;
295 chan
= lttng_chan
->chan
;
296 nr_streams
= channel_handle_get_nr_streams(lttng_chan
->handle
);
297 exp_streams
= chan
->nr_streams
;
298 return nr_streams
== exp_streams
;
302 int lttng_abi_create_session(void *owner
)
304 struct lttng_ust_session
*session
;
305 int session_objd
, ret
;
307 session
= lttng_session_create();
310 session_objd
= objd_alloc(session
, <tng_session_ops
, owner
, "session");
311 if (session_objd
< 0) {
315 session
->priv
->objd
= session_objd
;
316 session
->priv
->owner
= owner
;
320 lttng_session_destroy(session
);
325 long lttng_abi_tracer_version(int objd
,
326 struct lttng_ust_abi_tracer_version
*v
)
328 v
->major
= LTTNG_UST_MAJOR_VERSION
;
329 v
->minor
= LTTNG_UST_MINOR_VERSION
;
330 v
->patchlevel
= LTTNG_UST_PATCHLEVEL_VERSION
;
335 int lttng_abi_event_notifier_send_fd(void *owner
, int *event_notifier_notif_fd
)
337 struct lttng_event_notifier_group
*event_notifier_group
;
338 int event_notifier_group_objd
, ret
, fd_flag
;
340 event_notifier_group
= lttng_event_notifier_group_create();
341 if (!event_notifier_group
)
345 * Set this file descriptor as NON-BLOCKING.
347 fd_flag
= fcntl(*event_notifier_notif_fd
, F_GETFL
);
349 fd_flag
|= O_NONBLOCK
;
351 ret
= fcntl(*event_notifier_notif_fd
, F_SETFL
, fd_flag
);
357 event_notifier_group_objd
= objd_alloc(event_notifier_group
,
358 <tng_event_notifier_group_ops
, owner
, "event_notifier_group");
359 if (event_notifier_group_objd
< 0) {
360 ret
= event_notifier_group_objd
;
364 event_notifier_group
->objd
= event_notifier_group_objd
;
365 event_notifier_group
->owner
= owner
;
366 event_notifier_group
->notification_fd
= *event_notifier_notif_fd
;
367 /* Object descriptor takes ownership of notification fd. */
368 *event_notifier_notif_fd
= -1;
370 return event_notifier_group_objd
;
373 lttng_event_notifier_group_destroy(event_notifier_group
);
379 long lttng_abi_add_context(int objd
,
380 struct lttng_ust_abi_context
*context_param
,
381 union lttng_ust_abi_args
*uargs
,
382 struct lttng_ust_ctx
**ctx
, struct lttng_ust_session
*session
)
384 return lttng_attach_context(context_param
, uargs
, ctx
, session
);
388 * lttng_cmd - lttng control through socket commands
390 * @objd: the object descriptor
393 * @uargs: UST arguments (internal)
396 * This descriptor implements lttng commands:
397 * LTTNG_UST_ABI_SESSION
398 * Returns a LTTng trace session object descriptor
399 * LTTNG_UST_ABI_TRACER_VERSION
400 * Returns the LTTng kernel tracer version
401 * LTTNG_UST_ABI_TRACEPOINT_LIST
402 * Returns a file descriptor listing available tracepoints
403 * LTTNG_UST_ABI_TRACEPOINT_FIELD_LIST
404 * Returns a file descriptor listing available tracepoint fields
405 * LTTNG_UST_ABI_WAIT_QUIESCENT
406 * Returns after all previously running probes have completed
408 * The returned session will be deleted when its file descriptor is closed.
411 long lttng_cmd(int objd
, unsigned int cmd
, unsigned long arg
,
412 union lttng_ust_abi_args
*uargs
, void *owner
)
415 case LTTNG_UST_ABI_SESSION
:
416 return lttng_abi_create_session(owner
);
417 case LTTNG_UST_ABI_TRACER_VERSION
:
418 return lttng_abi_tracer_version(objd
,
419 (struct lttng_ust_abi_tracer_version
*) arg
);
420 case LTTNG_UST_ABI_TRACEPOINT_LIST
:
421 return lttng_abi_tracepoint_list(owner
);
422 case LTTNG_UST_ABI_TRACEPOINT_FIELD_LIST
:
423 return lttng_abi_tracepoint_field_list(owner
);
424 case LTTNG_UST_ABI_WAIT_QUIESCENT
:
425 lttng_ust_urcu_synchronize_rcu();
427 case LTTNG_UST_ABI_EVENT_NOTIFIER_GROUP_CREATE
:
428 return lttng_abi_event_notifier_send_fd(owner
,
429 &uargs
->event_notifier_handle
.event_notifier_notif_fd
);
435 static const struct lttng_ust_abi_objd_ops lttng_ops
= {
440 int lttng_abi_map_channel(int session_objd
,
441 struct lttng_ust_abi_channel
*ust_chan
,
442 union lttng_ust_abi_args
*uargs
,
445 struct lttng_ust_session
*session
= objd_private(session_objd
);
446 const char *transport_name
;
447 struct lttng_transport
*transport
;
448 const char *chan_name
;
450 struct lttng_ust_shm_handle
*channel_handle
;
451 struct lttng_ust_abi_channel_config
*lttng_chan_config
;
452 struct lttng_ust_channel_buffer
*lttng_chan_buf
;
453 struct lttng_ust_lib_ring_buffer_channel
*chan
;
454 struct lttng_ust_lib_ring_buffer_config
*config
;
459 enum lttng_ust_abi_chan_type type
;
461 chan_data
= uargs
->channel
.chan_data
;
462 wakeup_fd
= uargs
->channel
.wakeup_fd
;
464 type
= ust_chan
->type
;
467 case LTTNG_UST_ABI_CHAN_PER_CPU
:
474 if (session
->priv
->been_active
) {
476 goto active
; /* Refuse to add channel to active session */
479 lttng_chan_buf
= lttng_ust_alloc_channel_buffer();
480 if (!lttng_chan_buf
) {
482 goto lttng_chan_buf_error
;
485 channel_handle
= channel_handle_create(chan_data
, len
, wakeup_fd
);
486 if (!channel_handle
) {
491 /* Ownership of chan_data and wakeup_fd taken by channel handle. */
492 uargs
->channel
.chan_data
= NULL
;
493 uargs
->channel
.wakeup_fd
= -1;
495 chan
= shmp(channel_handle
, channel_handle
->chan
);
497 chan
->handle
= channel_handle
;
498 config
= &chan
->backend
.config
;
499 lttng_chan_config
= channel_get_private_config(chan
);
500 if (!lttng_chan_config
) {
505 /* Lookup transport name */
507 case LTTNG_UST_ABI_CHAN_PER_CPU
:
508 if (config
->output
== RING_BUFFER_MMAP
) {
509 if (config
->mode
== RING_BUFFER_OVERWRITE
) {
510 if (config
->wakeup
== RING_BUFFER_WAKEUP_BY_WRITER
) {
511 transport_name
= "relay-overwrite-mmap";
513 transport_name
= "relay-overwrite-rt-mmap";
516 if (config
->wakeup
== RING_BUFFER_WAKEUP_BY_WRITER
) {
517 transport_name
= "relay-discard-mmap";
519 transport_name
= "relay-discard-rt-mmap";
526 chan_name
= "channel";
532 transport
= lttng_ust_transport_find(transport_name
);
534 DBG("LTTng transport %s not found\n",
540 chan_objd
= objd_alloc(NULL
, <tng_channel_ops
, owner
, chan_name
);
546 /* Initialize our lttng chan */
547 lttng_chan_buf
->parent
->enabled
= 1;
548 lttng_chan_buf
->parent
->session
= session
;
550 lttng_chan_buf
->priv
->parent
.tstate
= 1;
551 lttng_chan_buf
->priv
->ctx
= NULL
;
553 lttng_chan_buf
->ops
= &transport
->ops
;
554 lttng_chan_buf
->chan
= chan
;
555 lttng_chan_buf
->handle
= channel_handle
;
557 memcpy(&chan
->backend
.config
,
558 transport
->client_config
,
559 sizeof(chan
->backend
.config
));
560 cds_list_add(<tng_chan_buf
->priv
->node
, &session
->priv
->chan_head
);
561 lttng_chan_buf
->priv
->header_type
= 0;
562 lttng_chan_buf
->priv
->type
= type
;
563 /* Copy fields from lttng ust chan config. */
564 lttng_chan_buf
->priv
->id
= lttng_chan_config
->id
;
565 memcpy(lttng_chan_buf
->priv
->uuid
, lttng_chan_config
->uuid
, LTTNG_UST_UUID_LEN
);
566 channel_set_private(chan
, lttng_chan_buf
);
569 * We tolerate no failure path after channel creation. It will stay
570 * invariant for the rest of the session.
572 objd_set_private(chan_objd
, lttng_chan_buf
);
573 lttng_chan_buf
->priv
->parent
.objd
= chan_objd
;
574 /* The channel created holds a reference on the session */
575 objd_ref(session_objd
);
578 /* error path after channel was created */
582 channel_destroy(chan
, channel_handle
, 0);
583 lttng_ust_free_channel_common(lttng_chan_buf
->parent
);
587 lttng_ust_free_channel_common(lttng_chan_buf
->parent
);
588 lttng_chan_buf_error
:
595 * lttng_session_cmd - lttng session object command
600 * @uargs: UST arguments (internal)
603 * This descriptor implements lttng commands:
604 * LTTNG_UST_ABI_CHANNEL
605 * Returns a LTTng channel object descriptor
606 * LTTNG_UST_ABI_ENABLE
607 * Enables tracing for a session (weak enable)
608 * LTTNG_UST_ABI_DISABLE
609 * Disables tracing for a session (strong disable)
611 * The returned channel will be deleted when its file descriptor is closed.
614 long lttng_session_cmd(int objd
, unsigned int cmd
, unsigned long arg
,
615 union lttng_ust_abi_args
*uargs
, void *owner
)
617 struct lttng_ust_session
*session
= objd_private(objd
);
620 case LTTNG_UST_ABI_CHANNEL
:
621 return lttng_abi_map_channel(objd
,
622 (struct lttng_ust_abi_channel
*) arg
,
624 case LTTNG_UST_ABI_SESSION_START
:
625 case LTTNG_UST_ABI_ENABLE
:
626 return lttng_session_enable(session
);
627 case LTTNG_UST_ABI_SESSION_STOP
:
628 case LTTNG_UST_ABI_DISABLE
:
629 return lttng_session_disable(session
);
630 case LTTNG_UST_ABI_SESSION_STATEDUMP
:
631 return lttng_session_statedump(session
);
632 case LTTNG_UST_ABI_COUNTER
:
633 case LTTNG_UST_ABI_COUNTER_GLOBAL
:
634 case LTTNG_UST_ABI_COUNTER_CPU
:
635 /* Not implemented yet. */
643 * Called when the last file reference is dropped.
645 * Big fat note: channels and events are invariant for the whole session after
646 * their creation. So this session destruction also destroys all channel and
647 * event structures specific to this session (they are not destroyed when their
648 * individual file is released).
651 int lttng_release_session(int objd
)
653 struct lttng_ust_session
*session
= objd_private(objd
);
656 lttng_session_destroy(session
);
663 static const struct lttng_ust_abi_objd_ops lttng_session_ops
= {
664 .release
= lttng_release_session
,
665 .cmd
= lttng_session_cmd
,
668 static int lttng_ust_event_notifier_enabler_create(int event_notifier_group_obj
,
669 void *owner
, struct lttng_ust_abi_event_notifier
*event_notifier_param
,
670 enum lttng_enabler_format_type type
)
672 struct lttng_event_notifier_group
*event_notifier_group
=
673 objd_private(event_notifier_group_obj
);
674 struct lttng_event_notifier_enabler
*event_notifier_enabler
;
675 int event_notifier_objd
, ret
;
677 event_notifier_param
->event
.name
[LTTNG_UST_ABI_SYM_NAME_LEN
- 1] = '\0';
678 event_notifier_objd
= objd_alloc(NULL
, <tng_event_notifier_enabler_ops
, owner
,
679 "event_notifier enabler");
680 if (event_notifier_objd
< 0) {
681 ret
= event_notifier_objd
;
685 event_notifier_enabler
= lttng_event_notifier_enabler_create(
686 event_notifier_group
, type
, event_notifier_param
);
687 if (!event_notifier_enabler
) {
689 goto event_notifier_error
;
692 objd_set_private(event_notifier_objd
, event_notifier_enabler
);
693 /* The event_notifier holds a reference on the event_notifier group. */
694 objd_ref(event_notifier_enabler
->group
->objd
);
696 return event_notifier_objd
;
698 event_notifier_error
:
702 err
= lttng_ust_abi_objd_unref(event_notifier_objd
, 1);
710 long lttng_event_notifier_enabler_cmd(int objd
, unsigned int cmd
, unsigned long arg
,
711 union lttng_ust_abi_args
*uargs
, void *owner
)
713 struct lttng_event_notifier_enabler
*event_notifier_enabler
= objd_private(objd
);
715 case LTTNG_UST_ABI_FILTER
:
716 return lttng_event_notifier_enabler_attach_filter_bytecode(
717 event_notifier_enabler
,
718 (struct lttng_ust_bytecode_node
**) arg
);
719 case LTTNG_UST_ABI_EXCLUSION
:
720 return lttng_event_notifier_enabler_attach_exclusion(event_notifier_enabler
,
721 (struct lttng_ust_excluder_node
**) arg
);
722 case LTTNG_UST_ABI_CAPTURE
:
723 return lttng_event_notifier_enabler_attach_capture_bytecode(
724 event_notifier_enabler
,
725 (struct lttng_ust_bytecode_node
**) arg
);
726 case LTTNG_UST_ABI_ENABLE
:
727 return lttng_event_notifier_enabler_enable(event_notifier_enabler
);
728 case LTTNG_UST_ABI_DISABLE
:
729 return lttng_event_notifier_enabler_disable(event_notifier_enabler
);
736 * lttng_event_notifier_group_error_counter_cmd - lttng event_notifier group error counter object command
741 * @uargs: UST arguments (internal)
744 * This descriptor implements lttng commands:
745 * LTTNG_UST_ABI_COUNTER_GLOBAL
746 * Return negative error code on error, 0 on success.
747 * LTTNG_UST_ABI_COUNTER_CPU
748 * Return negative error code on error, 0 on success.
751 long lttng_event_notifier_group_error_counter_cmd(int objd
, unsigned int cmd
, unsigned long arg
,
752 union lttng_ust_abi_args
*uargs
, void *owner
)
755 struct lttng_counter
*counter
= objd_private(objd
);
758 case LTTNG_UST_ABI_COUNTER_GLOBAL
:
759 ret
= -EINVAL
; /* Unimplemented. */
761 case LTTNG_UST_ABI_COUNTER_CPU
:
763 struct lttng_ust_abi_counter_cpu
*counter_cpu
=
764 (struct lttng_ust_abi_counter_cpu
*)arg
;
766 ret
= lttng_counter_set_cpu_shm(counter
->counter
,
767 counter_cpu
->cpu_nr
, uargs
->counter_shm
.shm_fd
);
769 /* Take ownership of the shm_fd. */
770 uargs
->counter_shm
.shm_fd
= -1;
782 __attribute__((visibility("hidden")))
783 int lttng_release_event_notifier_group_error_counter(int objd
)
785 struct lttng_counter
*counter
= objd_private(objd
);
788 return lttng_ust_abi_objd_unref(counter
->event_notifier_group
->objd
, 0);
794 static const struct lttng_ust_abi_objd_ops lttng_event_notifier_group_error_counter_ops
= {
795 .release
= lttng_release_event_notifier_group_error_counter
,
796 .cmd
= lttng_event_notifier_group_error_counter_cmd
,
800 int lttng_ust_event_notifier_group_create_error_counter(int event_notifier_group_objd
, void *owner
,
801 struct lttng_ust_abi_counter_conf
*error_counter_conf
)
803 const char *counter_transport_name
;
804 struct lttng_event_notifier_group
*event_notifier_group
=
805 objd_private(event_notifier_group_objd
);
806 struct lttng_counter
*counter
;
807 int counter_objd
, ret
;
808 struct lttng_counter_dimension dimensions
[1];
811 if (event_notifier_group
->error_counter
)
814 if (error_counter_conf
->arithmetic
!= LTTNG_UST_ABI_COUNTER_ARITHMETIC_MODULAR
)
817 if (error_counter_conf
->number_dimensions
!= 1)
820 switch (error_counter_conf
->bitness
) {
821 case LTTNG_UST_ABI_COUNTER_BITNESS_64
:
822 counter_transport_name
= "counter-per-cpu-64-modular";
824 case LTTNG_UST_ABI_COUNTER_BITNESS_32
:
825 counter_transport_name
= "counter-per-cpu-32-modular";
831 counter_objd
= objd_alloc(NULL
, <tng_event_notifier_group_error_counter_ops
, owner
,
832 "event_notifier group error counter");
833 if (counter_objd
< 0) {
838 counter_len
= error_counter_conf
->dimensions
[0].size
;
839 dimensions
[0].size
= counter_len
;
840 dimensions
[0].underflow_index
= 0;
841 dimensions
[0].overflow_index
= 0;
842 dimensions
[0].has_underflow
= 0;
843 dimensions
[0].has_overflow
= 0;
845 counter
= lttng_ust_counter_create(counter_transport_name
, 1, dimensions
);
851 event_notifier_group
->error_counter_len
= counter_len
;
853 * store-release to publish error counter matches load-acquire
854 * in record_error. Ensures the counter is created and the
855 * error_counter_len is set before they are used.
856 * Currently a full memory barrier is used, which could be
857 * turned into acquire-release barriers.
860 CMM_STORE_SHARED(event_notifier_group
->error_counter
, counter
);
862 counter
->objd
= counter_objd
;
863 counter
->event_notifier_group
= event_notifier_group
; /* owner */
865 objd_set_private(counter_objd
, counter
);
866 /* The error counter holds a reference on the event_notifier group. */
867 objd_ref(event_notifier_group
->objd
);
875 err
= lttng_ust_abi_objd_unref(counter_objd
, 1);
883 long lttng_event_notifier_group_cmd(int objd
, unsigned int cmd
, unsigned long arg
,
884 union lttng_ust_abi_args
*uargs
, void *owner
)
887 case LTTNG_UST_ABI_EVENT_NOTIFIER_CREATE
:
889 struct lttng_ust_abi_event_notifier
*event_notifier_param
=
890 (struct lttng_ust_abi_event_notifier
*) arg
;
891 if (strutils_is_star_glob_pattern(event_notifier_param
->event
.name
)) {
893 * If the event name is a star globbing pattern,
894 * we create the special star globbing enabler.
896 return lttng_ust_event_notifier_enabler_create(objd
,
897 owner
, event_notifier_param
,
898 LTTNG_ENABLER_FORMAT_STAR_GLOB
);
900 return lttng_ust_event_notifier_enabler_create(objd
,
901 owner
, event_notifier_param
,
902 LTTNG_ENABLER_FORMAT_EVENT
);
905 case LTTNG_UST_ABI_COUNTER
:
907 struct lttng_ust_abi_counter_conf
*counter_conf
=
908 (struct lttng_ust_abi_counter_conf
*) uargs
->counter
.counter_data
;
909 return lttng_ust_event_notifier_group_create_error_counter(
910 objd
, owner
, counter_conf
);
918 int lttng_event_notifier_enabler_release(int objd
)
920 struct lttng_event_notifier_enabler
*event_notifier_enabler
= objd_private(objd
);
922 if (event_notifier_enabler
)
923 return lttng_ust_abi_objd_unref(event_notifier_enabler
->group
->objd
, 0);
927 static const struct lttng_ust_abi_objd_ops lttng_event_notifier_enabler_ops
= {
928 .release
= lttng_event_notifier_enabler_release
,
929 .cmd
= lttng_event_notifier_enabler_cmd
,
933 int lttng_release_event_notifier_group(int objd
)
935 struct lttng_event_notifier_group
*event_notifier_group
= objd_private(objd
);
937 if (event_notifier_group
) {
938 lttng_event_notifier_group_destroy(event_notifier_group
);
945 static const struct lttng_ust_abi_objd_ops lttng_event_notifier_group_ops
= {
946 .release
= lttng_release_event_notifier_group
,
947 .cmd
= lttng_event_notifier_group_cmd
,
951 long lttng_tracepoint_list_cmd(int objd
, unsigned int cmd
, unsigned long arg
,
952 union lttng_ust_abi_args
*uargs
, void *owner
)
954 struct lttng_ust_tracepoint_list
*list
= objd_private(objd
);
955 struct lttng_ust_abi_tracepoint_iter
*tp
=
956 (struct lttng_ust_abi_tracepoint_iter
*) arg
;
957 struct lttng_ust_abi_tracepoint_iter
*iter
;
960 case LTTNG_UST_ABI_TRACEPOINT_LIST_GET
:
962 iter
= lttng_ust_tracepoint_list_get_iter_next(list
);
964 return -LTTNG_UST_ERR_NOENT
;
965 memcpy(tp
, iter
, sizeof(*tp
));
974 int lttng_abi_tracepoint_list(void *owner
)
977 struct lttng_ust_tracepoint_list
*list
;
979 list_objd
= objd_alloc(NULL
, <tng_tracepoint_list_ops
, owner
, "tp_list");
984 list
= zmalloc(sizeof(*list
));
989 objd_set_private(list_objd
, list
);
991 /* populate list by walking on all registered probes. */
992 ret
= lttng_probes_get_event_list(list
);
1004 err
= lttng_ust_abi_objd_unref(list_objd
, 1);
1012 int lttng_release_tracepoint_list(int objd
)
1014 struct lttng_ust_tracepoint_list
*list
= objd_private(objd
);
1017 lttng_probes_prune_event_list(list
);
1025 static const struct lttng_ust_abi_objd_ops lttng_tracepoint_list_ops
= {
1026 .release
= lttng_release_tracepoint_list
,
1027 .cmd
= lttng_tracepoint_list_cmd
,
1031 long lttng_tracepoint_field_list_cmd(int objd
, unsigned int cmd
,
1032 unsigned long arg
, union lttng_ust_abi_args
*uargs
, void *owner
)
1034 struct lttng_ust_field_list
*list
= objd_private(objd
);
1035 struct lttng_ust_abi_field_iter
*tp
= &uargs
->field_list
.entry
;
1036 struct lttng_ust_abi_field_iter
*iter
;
1039 case LTTNG_UST_ABI_TRACEPOINT_FIELD_LIST_GET
:
1041 iter
= lttng_ust_field_list_get_iter_next(list
);
1043 return -LTTNG_UST_ERR_NOENT
;
1044 memcpy(tp
, iter
, sizeof(*tp
));
1053 int lttng_abi_tracepoint_field_list(void *owner
)
1056 struct lttng_ust_field_list
*list
;
1058 list_objd
= objd_alloc(NULL
, <tng_tracepoint_field_list_ops
, owner
,
1060 if (list_objd
< 0) {
1064 list
= zmalloc(sizeof(*list
));
1069 objd_set_private(list_objd
, list
);
1071 /* populate list by walking on all registered probes. */
1072 ret
= lttng_probes_get_field_list(list
);
1084 err
= lttng_ust_abi_objd_unref(list_objd
, 1);
1092 int lttng_release_tracepoint_field_list(int objd
)
1094 struct lttng_ust_field_list
*list
= objd_private(objd
);
1097 lttng_probes_prune_field_list(list
);
1105 static const struct lttng_ust_abi_objd_ops lttng_tracepoint_field_list_ops
= {
1106 .release
= lttng_release_tracepoint_field_list
,
1107 .cmd
= lttng_tracepoint_field_list_cmd
,
1111 int lttng_abi_map_stream(int channel_objd
, struct lttng_ust_abi_stream
*info
,
1112 union lttng_ust_abi_args
*uargs
, void *owner
)
1114 struct lttng_ust_channel_buffer
*lttng_chan_buf
= objd_private(channel_objd
);
1117 ret
= channel_handle_add_stream(lttng_chan_buf
->handle
,
1118 uargs
->stream
.shm_fd
, uargs
->stream
.wakeup_fd
,
1119 info
->stream_nr
, info
->len
);
1121 goto error_add_stream
;
1122 /* Take ownership of shm_fd and wakeup_fd. */
1123 uargs
->stream
.shm_fd
= -1;
1124 uargs
->stream
.wakeup_fd
= -1;
1133 int lttng_abi_create_event_enabler(int channel_objd
,
1134 struct lttng_ust_abi_event
*event_param
,
1136 enum lttng_enabler_format_type format_type
)
1138 struct lttng_ust_channel_buffer
*channel
= objd_private(channel_objd
);
1139 struct lttng_event_enabler
*enabler
;
1140 int event_objd
, ret
;
1142 event_param
->name
[LTTNG_UST_ABI_SYM_NAME_LEN
- 1] = '\0';
1143 event_objd
= objd_alloc(NULL
, <tng_event_enabler_ops
, owner
,
1145 if (event_objd
< 0) {
1150 * We tolerate no failure path after event creation. It will stay
1151 * invariant for the rest of the session.
1153 enabler
= lttng_event_enabler_create(format_type
, event_param
, channel
);
1158 objd_set_private(event_objd
, enabler
);
1159 /* The event holds a reference on the channel */
1160 objd_ref(channel_objd
);
1167 err
= lttng_ust_abi_objd_unref(event_objd
, 1);
1175 * lttng_channel_cmd - lttng control through object descriptors
1177 * @objd: the object descriptor
1180 * @uargs: UST arguments (internal)
1181 * @owner: objd owner
1183 * This object descriptor implements lttng commands:
1184 * LTTNG_UST_ABI_STREAM
1185 * Returns an event stream object descriptor or failure.
1186 * (typically, one event stream records events from one CPU)
1187 * LTTNG_UST_ABI_EVENT
1188 * Returns an event object descriptor or failure.
1189 * LTTNG_UST_ABI_CONTEXT
1190 * Prepend a context field to each event in the channel
1191 * LTTNG_UST_ABI_ENABLE
1192 * Enable recording for events in this channel (weak enable)
1193 * LTTNG_UST_ABI_DISABLE
1194 * Disable recording for events in this channel (strong disable)
1196 * Channel and event file descriptors also hold a reference on the session.
1199 long lttng_channel_cmd(int objd
, unsigned int cmd
, unsigned long arg
,
1200 union lttng_ust_abi_args
*uargs
, void *owner
)
1202 struct lttng_ust_channel_buffer
*lttng_chan_buf
= objd_private(objd
);
1204 if (cmd
!= LTTNG_UST_ABI_STREAM
) {
1206 * Check if channel received all streams.
1208 if (!lttng_is_channel_ready(lttng_chan_buf
))
1213 case LTTNG_UST_ABI_STREAM
:
1215 struct lttng_ust_abi_stream
*stream
;
1217 stream
= (struct lttng_ust_abi_stream
*) arg
;
1218 /* stream used as output */
1219 return lttng_abi_map_stream(objd
, stream
, uargs
, owner
);
1221 case LTTNG_UST_ABI_EVENT
:
1223 struct lttng_ust_abi_event
*event_param
=
1224 (struct lttng_ust_abi_event
*) arg
;
1226 if (strutils_is_star_glob_pattern(event_param
->name
)) {
1228 * If the event name is a star globbing pattern,
1229 * we create the special star globbing enabler.
1231 return lttng_abi_create_event_enabler(objd
, event_param
,
1232 owner
, LTTNG_ENABLER_FORMAT_STAR_GLOB
);
1234 return lttng_abi_create_event_enabler(objd
, event_param
,
1235 owner
, LTTNG_ENABLER_FORMAT_EVENT
);
1238 case LTTNG_UST_ABI_CONTEXT
:
1239 return lttng_abi_add_context(objd
,
1240 (struct lttng_ust_abi_context
*) arg
, uargs
,
1241 <tng_chan_buf
->priv
->ctx
,
1242 lttng_chan_buf
->parent
->session
);
1243 case LTTNG_UST_ABI_ENABLE
:
1244 return lttng_channel_enable(lttng_chan_buf
->parent
);
1245 case LTTNG_UST_ABI_DISABLE
:
1246 return lttng_channel_disable(lttng_chan_buf
->parent
);
1247 case LTTNG_UST_ABI_FLUSH_BUFFER
:
1248 return lttng_chan_buf
->ops
->priv
->flush_buffer(lttng_chan_buf
->chan
,
1249 lttng_chan_buf
->handle
);
1256 int lttng_channel_release(int objd
)
1258 struct lttng_ust_channel_buffer
*lttng_chan_buf
= objd_private(objd
);
1261 return lttng_ust_abi_objd_unref(lttng_chan_buf
->parent
->session
->priv
->objd
, 0);
1265 static const struct lttng_ust_abi_objd_ops lttng_channel_ops
= {
1266 .release
= lttng_channel_release
,
1267 .cmd
= lttng_channel_cmd
,
1271 * lttng_enabler_cmd - lttng control through object descriptors
1273 * @objd: the object descriptor
1276 * @uargs: UST arguments (internal)
1277 * @owner: objd owner
1279 * This object descriptor implements lttng commands:
1280 * LTTNG_UST_ABI_CONTEXT
1281 * Prepend a context field to each record of events of this
1283 * LTTNG_UST_ABI_ENABLE
1284 * Enable recording for this enabler
1285 * LTTNG_UST_ABI_DISABLE
1286 * Disable recording for this enabler
1287 * LTTNG_UST_ABI_FILTER
1288 * Attach a filter to an enabler.
1289 * LTTNG_UST_ABI_EXCLUSION
1290 * Attach exclusions to an enabler.
1293 long lttng_event_enabler_cmd(int objd
, unsigned int cmd
, unsigned long arg
,
1294 union lttng_ust_abi_args
*uargs
, void *owner
)
1296 struct lttng_event_enabler
*enabler
= objd_private(objd
);
1299 case LTTNG_UST_ABI_CONTEXT
:
1300 return lttng_event_enabler_attach_context(enabler
,
1301 (struct lttng_ust_abi_context
*) arg
);
1302 case LTTNG_UST_ABI_ENABLE
:
1303 return lttng_event_enabler_enable(enabler
);
1304 case LTTNG_UST_ABI_DISABLE
:
1305 return lttng_event_enabler_disable(enabler
);
1306 case LTTNG_UST_ABI_FILTER
:
1310 ret
= lttng_event_enabler_attach_filter_bytecode(enabler
,
1311 (struct lttng_ust_bytecode_node
**) arg
);
1316 case LTTNG_UST_ABI_EXCLUSION
:
1318 return lttng_event_enabler_attach_exclusion(enabler
,
1319 (struct lttng_ust_excluder_node
**) arg
);
1327 int lttng_event_enabler_release(int objd
)
1329 struct lttng_event_enabler
*event_enabler
= objd_private(objd
);
1332 return lttng_ust_abi_objd_unref(event_enabler
->chan
->priv
->parent
.objd
, 0);
1337 static const struct lttng_ust_abi_objd_ops lttng_event_enabler_ops
= {
1338 .release
= lttng_event_enabler_release
,
1339 .cmd
= lttng_event_enabler_cmd
,
1342 void lttng_ust_abi_exit(void)
1344 lttng_ust_abi_close_in_progress
= 1;
1346 objd_table_destroy();
1348 lttng_ust_abi_close_in_progress
= 0;