2 * Copyright (C) 2011 - David Goulet <david.goulet@polymtl.ca>
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License, version 2 only,
6 * as published by the Free Software Foundation.
8 * This program is distributed in the hope that it will be useful,
9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
11 * GNU General Public License for more details.
13 * You should have received a copy of the GNU General Public License along
14 * with this program; if not, write to the Free Software Foundation, Inc.,
15 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
20 #include <urcu/list.h>
23 #include <lttng/lttng.h>
24 #include <common/error.h>
25 #include <common/sessiond-comm/sessiond-comm.h>
32 #include "trace-kernel.h"
33 #include "trace-ust.h"
36 * Setup a lttng_event used to enable *all* syscall tracing.
38 static void init_syscalls_kernel_event(struct lttng_event
*event
)
40 event
->name
[0] = '\0';
42 * We use LTTNG_EVENT* here since the trace kernel creation will make the
43 * right changes for the kernel.
45 event
->type
= LTTNG_EVENT_SYSCALL
;
49 * Disable kernel tracepoint event for a channel from the kernel session.
51 int event_kernel_disable_tracepoint(struct ltt_kernel_session
*ksession
,
52 struct ltt_kernel_channel
*kchan
, char *event_name
)
55 struct ltt_kernel_event
*kevent
;
57 kevent
= trace_kernel_get_event_by_name(event_name
, kchan
);
59 ret
= LTTCOMM_NO_EVENT
;
63 ret
= kernel_disable_event(kevent
);
65 ret
= LTTCOMM_KERN_DISABLE_FAIL
;
69 DBG("Kernel event %s disable for channel %s.",
70 kevent
->event
->name
, kchan
->channel
->name
);
79 * Disable kernel tracepoint events for a channel from the kernel session.
81 int event_kernel_disable_all_tracepoints(struct ltt_kernel_session
*ksession
,
82 struct ltt_kernel_channel
*kchan
)
85 struct ltt_kernel_event
*kevent
;
87 /* For each event in the kernel session */
88 cds_list_for_each_entry(kevent
, &kchan
->events_list
.head
, list
) {
89 ret
= kernel_disable_event(kevent
);
91 /* We continue disabling the rest */
100 * Disable kernel syscall events for a channel from the kernel session.
102 int event_kernel_disable_all_syscalls(struct ltt_kernel_session
*ksession
,
103 struct ltt_kernel_channel
*kchan
)
105 ERR("Cannot disable syscall tracing for existing session. Please destroy session instead.");
106 return LTTCOMM_OK
; /* Return OK so disable all succeeds */
110 * Disable all kernel event for a channel from the kernel session.
112 int event_kernel_disable_all(struct ltt_kernel_session
*ksession
,
113 struct ltt_kernel_channel
*kchan
)
117 ret
= event_kernel_disable_all_tracepoints(ksession
, kchan
);
118 if (ret
!= LTTCOMM_OK
)
120 ret
= event_kernel_disable_all_syscalls(ksession
, kchan
);
125 * Enable kernel tracepoint event for a channel from the kernel session.
127 int event_kernel_enable_tracepoint(struct ltt_kernel_session
*ksession
,
128 struct ltt_kernel_channel
*kchan
, struct lttng_event
*event
)
131 struct ltt_kernel_event
*kevent
;
133 kevent
= trace_kernel_get_event_by_name(event
->name
, kchan
);
134 if (kevent
== NULL
) {
135 ret
= kernel_create_event(event
, kchan
);
139 ret
= LTTCOMM_KERN_EVENT_EXIST
;
142 ret
= LTTCOMM_KERN_EVENT_ENOSYS
;
145 ret
= LTTCOMM_KERN_ENABLE_FAIL
;
150 } else if (kevent
->enabled
== 0) {
151 ret
= kernel_enable_event(kevent
);
153 ret
= LTTCOMM_KERN_ENABLE_FAIL
;
157 /* At this point, the event is considered enabled */
158 ret
= LTTCOMM_KERN_EVENT_EXIST
;
168 * Enable all kernel tracepoint events of a channel of the kernel session.
170 int event_kernel_enable_all_tracepoints(struct ltt_kernel_session
*ksession
,
171 struct ltt_kernel_channel
*kchan
, int kernel_tracer_fd
)
174 struct ltt_kernel_event
*kevent
;
175 struct lttng_event
*event_list
= NULL
;
177 /* For each event in the kernel session */
178 cds_list_for_each_entry(kevent
, &kchan
->events_list
.head
, list
) {
179 if (kevent
->enabled
== 0) {
180 ret
= kernel_enable_event(kevent
);
182 /* Enable failed but still continue */
188 size
= kernel_list_events(kernel_tracer_fd
, &event_list
);
190 ret
= LTTCOMM_KERN_LIST_FAIL
;
194 for (i
= 0; i
< size
; i
++) {
195 kevent
= trace_kernel_get_event_by_name(event_list
[i
].name
, kchan
);
196 if (kevent
== NULL
) {
197 /* Default event type for enable all */
198 event_list
[i
].type
= LTTNG_EVENT_TRACEPOINT
;
199 /* Enable each single tracepoint event */
200 ret
= kernel_create_event(&event_list
[i
], kchan
);
202 /* Ignore error here and continue */
215 * Enable all kernel tracepoint events of a channel of the kernel session.
217 int event_kernel_enable_all_syscalls(struct ltt_kernel_session
*ksession
,
218 struct ltt_kernel_channel
*kchan
, int kernel_tracer_fd
)
221 struct lttng_event event
;
223 init_syscalls_kernel_event(&event
);
225 DBG("Enabling all syscall tracing");
227 ret
= kernel_create_event(&event
, kchan
);
229 if (ret
== -EEXIST
) {
230 ret
= LTTCOMM_KERN_EVENT_EXIST
;
232 ret
= LTTCOMM_KERN_ENABLE_FAIL
;
243 * Enable all kernel events of a channel of the kernel session.
245 int event_kernel_enable_all(struct ltt_kernel_session
*ksession
,
246 struct ltt_kernel_channel
*kchan
, int kernel_tracer_fd
)
250 tp_ret
= event_kernel_enable_all_tracepoints(ksession
, kchan
, kernel_tracer_fd
);
251 if (tp_ret
!= LTTCOMM_OK
) {
256 * Reaching this code path means that all tracepoints were enabled without
257 * errors so we ignore the error value of syscalls.
259 * At the moment, failing to enable syscalls on "lttng enable-event -a -k"
260 * is not considered an error that need to be returned to the client since
261 * tracepoints did not fail. Future work will allow us to send back
262 * multiple errors to the client in one API call.
264 (void) event_kernel_enable_all_syscalls(ksession
, kchan
, kernel_tracer_fd
);
271 * ============================
272 * UST : The Ultimate Frontier!
273 * ============================
277 * Enable all UST tracepoints for a channel from a UST session.
279 int event_ust_enable_all_tracepoints(struct ltt_ust_session
*usess
, int domain
,
280 struct ltt_ust_channel
*uchan
)
284 struct lttng_ht_iter iter
;
285 struct ltt_ust_event
*uevent
= NULL
;
286 struct lttng_event
*events
= NULL
;
289 case LTTNG_DOMAIN_UST
:
291 /* Enable existing events */
292 cds_lfht_for_each_entry(uchan
->events
->ht
, &iter
.iter
, uevent
,
294 if (uevent
->enabled
== 0) {
295 ret
= ust_app_enable_event_glb(usess
, uchan
, uevent
);
303 /* Get all UST available events */
304 size
= ust_app_list_events(&events
);
306 ret
= LTTCOMM_UST_LIST_FAIL
;
310 for (i
= 0; i
< size
; i
++) {
312 * Check if event exist and if so, continue since it was enable
315 uevent
= trace_ust_find_event_by_name(uchan
->events
,
317 if (uevent
!= NULL
) {
318 ret
= ust_app_enable_event_pid(usess
, uchan
, uevent
,
321 if (ret
!= -EEXIST
) {
322 ret
= LTTCOMM_UST_ENABLE_FAIL
;
329 /* Create ust event */
330 uevent
= trace_ust_create_event(&events
[i
]);
331 if (uevent
== NULL
) {
336 /* Create event for the specific PID */
337 ret
= ust_app_enable_event_pid(usess
, uchan
, uevent
,
340 if (ret
== -EEXIST
) {
341 ret
= LTTCOMM_UST_EVENT_EXIST
;
344 ret
= LTTCOMM_UST_ENABLE_FAIL
;
350 /* Add ltt ust event to channel */
352 lttng_ht_add_unique_str(uchan
->events
, &uevent
->node
);
360 case LTTNG_DOMAIN_UST_EXEC_NAME
:
361 case LTTNG_DOMAIN_UST_PID
:
362 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN
:
372 trace_ust_destroy_event(uevent
);
380 * Enable UST tracepoint event for a channel from a UST session.
382 int event_ust_enable_tracepoint(struct ltt_ust_session
*usess
, int domain
,
383 struct ltt_ust_channel
*uchan
, struct lttng_event
*event
)
385 int ret
= LTTCOMM_OK
, to_create
= 0;
386 struct ltt_ust_event
*uevent
;
388 uevent
= trace_ust_find_event_by_name(uchan
->events
, event
->name
);
389 if (uevent
== NULL
) {
390 uevent
= trace_ust_create_event(event
);
391 if (uevent
== NULL
) {
395 /* Valid to set it after the goto error since uevent is still NULL */
399 if (uevent
->enabled
) {
400 /* It's already enabled so everything is OK */
407 case LTTNG_DOMAIN_UST
:
410 /* Create event on all UST registered apps for session */
411 ret
= ust_app_create_event_glb(usess
, uchan
, uevent
);
413 /* Enable event on all UST registered apps for session */
414 ret
= ust_app_enable_event_glb(usess
, uchan
, uevent
);
418 if (ret
== -EEXIST
) {
419 ret
= LTTCOMM_UST_EVENT_EXIST
;
422 ret
= LTTCOMM_UST_ENABLE_FAIL
;
429 case LTTNG_DOMAIN_UST_EXEC_NAME
:
430 case LTTNG_DOMAIN_UST_PID
:
431 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN
:
440 /* Add ltt ust event to channel */
441 lttng_ht_add_unique_str(uchan
->events
, &uevent
->node
);
445 DBG("Event UST %s %s in channel %s", uevent
->attr
.name
,
446 to_create
? "created" : "enabled", uchan
->name
);
455 * Only destroy event on creation time (not enabling time) because if the
456 * event is found in the channel (to_create == 0), it means that at some
457 * point the enable_event worked and it's thus valid to keep it alive.
458 * Destroying it also implies that we also destroy it's shadow copy to sync
462 /* In this code path, the uevent was not added to the hash table */
463 trace_ust_destroy_event(uevent
);
469 * Disable UST tracepoint of a channel from a UST session.
471 int event_ust_disable_tracepoint(struct ltt_ust_session
*usess
, int domain
,
472 struct ltt_ust_channel
*uchan
, char *event_name
)
475 struct ltt_ust_event
*uevent
;
477 uevent
= trace_ust_find_event_by_name(uchan
->events
, event_name
);
478 if (uevent
== NULL
) {
479 ret
= LTTCOMM_UST_EVENT_NOT_FOUND
;
483 if (uevent
->enabled
== 0) {
484 /* It's already enabled so everything is OK */
490 case LTTNG_DOMAIN_UST
:
491 ret
= ust_app_disable_event_glb(usess
, uchan
, uevent
);
492 if (ret
< 0 && ret
!= -EEXIST
) {
493 ret
= LTTCOMM_UST_DISABLE_FAIL
;
498 case LTTNG_DOMAIN_UST_EXEC_NAME
:
499 case LTTNG_DOMAIN_UST_PID
:
500 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN
:
511 DBG2("Event UST %s disabled in channel %s", uevent
->attr
.name
,
519 * Disable all UST tracepoints for a channel from a UST session.
521 int event_ust_disable_all_tracepoints(struct ltt_ust_session
*usess
, int domain
,
522 struct ltt_ust_channel
*uchan
)
526 struct lttng_ht_iter iter
;
527 struct ltt_ust_event
*uevent
= NULL
;
528 struct lttng_event
*events
= NULL
;
531 case LTTNG_DOMAIN_UST
:
533 /* Disabling existing events */
534 cds_lfht_for_each_entry(uchan
->events
->ht
, &iter
.iter
, uevent
,
536 if (uevent
->enabled
== 1) {
537 ret
= ust_app_disable_event_glb(usess
, uchan
, uevent
);
545 /* Get all UST available events */
546 size
= ust_app_list_events(&events
);
548 ret
= LTTCOMM_UST_LIST_FAIL
;
552 for (i
= 0; i
< size
; i
++) {
553 uevent
= trace_ust_find_event_by_name(uchan
->events
,
555 if (uevent
!= NULL
&& uevent
->enabled
== 1) {
556 ret
= ust_app_disable_event_pid(usess
, uchan
, uevent
,
558 if (ret
< 0 && ret
!= -EEXIST
) {
559 ret
= LTTCOMM_UST_DISABLE_FAIL
;
571 case LTTNG_DOMAIN_UST_EXEC_NAME
:
572 case LTTNG_DOMAIN_UST_PID
:
573 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN
: