2 * Copyright (C) 2011 - David Goulet <david.goulet@polymtl.ca>
4 * This program is free software; you can redistribute it and/or modify it
5 * under the terms of the GNU General Public License as published by the Free
6 * Software Foundation; only version 2 of the License.
8 * This program is distributed in the hope that it will be useful, but WITHOUT
9 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
10 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
13 * You should have received a copy of the GNU General Public License along with
14 * this program; if not, write to the Free Software Foundation, Inc., 59 Temple
15 * Place - Suite 330, Boston, MA 02111-1307, USA.
19 #include <urcu/list.h>
22 #include <lttng/lttng.h>
23 #include <lttng-sessiond-comm.h>
28 #include "hashtable.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
);
137 if (ret
== -EEXIST
) {
138 ret
= LTTCOMM_KERN_EVENT_EXIST
;
140 ret
= LTTCOMM_KERN_ENABLE_FAIL
;
144 } else if (kevent
->enabled
== 0) {
145 ret
= kernel_enable_event(kevent
);
147 ret
= LTTCOMM_KERN_ENABLE_FAIL
;
157 * Enable all kernel tracepoint events of a channel of the kernel session.
159 int event_kernel_enable_all_tracepoints(struct ltt_kernel_session
*ksession
,
160 struct ltt_kernel_channel
*kchan
, int kernel_tracer_fd
)
163 struct ltt_kernel_event
*kevent
;
164 struct lttng_event
*event_list
;
166 /* For each event in the kernel session */
167 cds_list_for_each_entry(kevent
, &kchan
->events_list
.head
, list
) {
168 ret
= kernel_enable_event(kevent
);
170 /* Enable failed but still continue */
175 size
= kernel_list_events(kernel_tracer_fd
, &event_list
);
177 ret
= LTTCOMM_KERN_LIST_FAIL
;
181 for (i
= 0; i
< size
; i
++) {
182 kevent
= trace_kernel_get_event_by_name(event_list
[i
].name
, kchan
);
183 if (kevent
== NULL
) {
184 /* Default event type for enable all */
185 event_list
[i
].type
= LTTNG_EVENT_TRACEPOINT
;
186 /* Enable each single tracepoint event */
187 ret
= kernel_create_event(&event_list
[i
], kchan
);
189 /* Ignore error here and continue */
201 * Enable all kernel tracepoint events of a channel of the kernel session.
203 int event_kernel_enable_all_syscalls(struct ltt_kernel_session
*ksession
,
204 struct ltt_kernel_channel
*kchan
, int kernel_tracer_fd
)
207 struct lttng_event event
;
209 init_syscalls_kernel_event(&event
);
211 DBG("Enabling all syscall tracing");
213 ret
= kernel_create_event(&event
, kchan
);
223 * Enable all kernel events of a channel of the kernel session.
225 int event_kernel_enable_all(struct ltt_kernel_session
*ksession
,
226 struct ltt_kernel_channel
*kchan
, int kernel_tracer_fd
)
230 ret
= event_kernel_enable_all_tracepoints(ksession
, kchan
, kernel_tracer_fd
);
231 if (ret
!= LTTCOMM_OK
) {
234 ret
= event_kernel_enable_all_syscalls(ksession
, kchan
, kernel_tracer_fd
);
240 * Enable UST tracepoint event for a channel from a UST session.
242 int event_ust_enable_tracepoint(struct ltt_ust_session
*usess
, int domain
,
243 struct ltt_ust_channel
*uchan
, struct lttng_event
*event
)
245 int ret
, to_create
= 0;
246 struct ltt_ust_event
*uevent
;
248 uevent
= trace_ust_find_event_by_name(uchan
->events
, event
->name
);
249 if (uevent
== NULL
) {
250 uevent
= trace_ust_create_event(event
);
251 if (uevent
== NULL
) {
259 case LTTNG_DOMAIN_UST
:
262 /* Create event on all UST registered apps for session */
263 ret
= ust_app_create_event_glb(usess
, uchan
, uevent
);
265 /* Enable event on all UST registered apps for session */
266 ret
= ust_app_enable_event_glb(usess
, uchan
, uevent
);
270 if (ret
== -EEXIST
) {
271 ret
= LTTCOMM_UST_EVENT_EXIST
;
273 ret
= LTTCOMM_UST_ENABLE_FAIL
;
278 DBG("Event UST %s added to channel %s", uevent
->attr
.name
,
282 case LTTNG_DOMAIN_UST_EXEC_NAME
:
283 case LTTNG_DOMAIN_UST_PID
:
284 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN
:
286 ret
= LTTCOMM_NOT_IMPLEMENTED
;
291 /* Add ltt ust event to channel */
293 hashtable_add_unique(uchan
->events
, &uevent
->node
);
299 trace_ust_destroy_event(uevent
);
304 int event_ust_disable_tracepoint(struct ltt_ust_session
*ustsession
,
305 struct ltt_ust_channel
*ustchan
, char *event_name
)
308 struct ltt_ust_event
*ustevent
;
310 ustevent
= trace_ust_find_event_by_name(ustchan
->events
, event_name
);
311 if (ustevent
== NULL
) {
312 ret
= LTTCOMM_NO_EVENT
;
315 //ret = ustctl_disable(ustsession->sock, ustevent->obj);
317 ret
= LTTCOMM_UST_ENABLE_FAIL
;
320 ustevent
->enabled
= 0;