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.
22 #include <common/common.h>
23 #include <common/defaults.h>
24 #include <common/sessiond-comm/sessiond-comm.h>
33 * Return allocated channel attributes.
35 struct lttng_channel
*channel_new_default_attr(int dom
)
37 struct lttng_channel
*chan
;
39 chan
= zmalloc(sizeof(struct lttng_channel
));
41 PERROR("zmalloc channel init");
45 if (snprintf(chan
->name
, sizeof(chan
->name
), "%s",
46 DEFAULT_CHANNEL_NAME
) < 0) {
47 PERROR("snprintf default channel name");
51 chan
->attr
.overwrite
= DEFAULT_CHANNEL_OVERWRITE
;
52 chan
->attr
.switch_timer_interval
= DEFAULT_CHANNEL_SWITCH_TIMER
;
53 chan
->attr
.read_timer_interval
= DEFAULT_CHANNEL_READ_TIMER
;
56 case LTTNG_DOMAIN_KERNEL
:
57 chan
->attr
.subbuf_size
= DEFAULT_KERNEL_CHANNEL_SUBBUF_SIZE
;
58 chan
->attr
.num_subbuf
= DEFAULT_KERNEL_CHANNEL_SUBBUF_NUM
;
59 chan
->attr
.output
= DEFAULT_KERNEL_CHANNEL_OUTPUT
;
61 case LTTNG_DOMAIN_UST
:
63 case LTTNG_DOMAIN_UST_PID
:
64 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN
:
65 case LTTNG_DOMAIN_UST_EXEC_NAME
:
67 chan
->attr
.subbuf_size
= DEFAULT_UST_CHANNEL_SUBBUF_SIZE
;
68 chan
->attr
.num_subbuf
= DEFAULT_UST_CHANNEL_SUBBUF_NUM
;
69 chan
->attr
.output
= DEFAULT_UST_CHANNEL_OUTPUT
;
72 goto error
; /* Not implemented */
84 * Disable kernel channel of the kernel session.
86 int channel_kernel_disable(struct ltt_kernel_session
*ksession
,
90 struct ltt_kernel_channel
*kchan
;
92 kchan
= trace_kernel_get_channel_by_name(channel_name
, ksession
);
94 ret
= LTTCOMM_KERN_CHAN_NOT_FOUND
;
96 } else if (kchan
->enabled
== 1) {
97 ret
= kernel_disable_channel(kchan
);
98 if (ret
< 0 && ret
!= -EEXIST
) {
99 ret
= LTTCOMM_KERN_CHAN_DISABLE_FAIL
;
111 * Enable kernel channel of the kernel session.
113 int channel_kernel_enable(struct ltt_kernel_session
*ksession
,
114 struct ltt_kernel_channel
*kchan
)
118 if (kchan
->enabled
== 0) {
119 ret
= kernel_enable_channel(kchan
);
121 ret
= LTTCOMM_KERN_CHAN_ENABLE_FAIL
;
133 * Create kernel channel of the kernel session and notify kernel thread.
135 int channel_kernel_create(struct ltt_kernel_session
*ksession
,
136 struct lttng_channel
*attr
, int kernel_pipe
)
139 struct lttng_channel
*defattr
= NULL
;
141 /* Creating channel attributes if needed */
143 defattr
= channel_new_default_attr(LTTNG_DOMAIN_KERNEL
);
144 if (defattr
== NULL
) {
151 /* Channel not found, creating it */
152 ret
= kernel_create_channel(ksession
, attr
, ksession
->trace_path
);
154 ret
= LTTCOMM_KERN_CHAN_FAIL
;
158 /* Notify kernel thread that there is a new channel */
159 ret
= notify_thread_pipe(kernel_pipe
);
172 * Enable UST channel for session and domain.
174 int channel_ust_enable(struct ltt_ust_session
*usess
, int domain
,
175 struct ltt_ust_channel
*uchan
)
177 int ret
= LTTCOMM_OK
;
179 /* If already enabled, everything is OK */
180 if (uchan
->enabled
) {
181 DBG3("Channel %s already enabled. Skipping", uchan
->name
);
186 case LTTNG_DOMAIN_UST
:
187 DBG2("Channel %s being enabled in UST global domain", uchan
->name
);
188 /* Enable channel for global domain */
189 ret
= ust_app_enable_channel_glb(usess
, uchan
);
192 case LTTNG_DOMAIN_UST_PID
:
193 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN
:
194 case LTTNG_DOMAIN_UST_EXEC_NAME
:
202 if (ret
!= -EEXIST
) {
203 ret
= LTTCOMM_UST_CHAN_ENABLE_FAIL
;
211 DBG2("Channel %s enabled successfully", uchan
->name
);
219 * Create UST channel for session and domain.
221 int channel_ust_create(struct ltt_ust_session
*usess
, int domain
,
222 struct lttng_channel
*attr
)
224 int ret
= LTTCOMM_OK
;
225 struct ltt_ust_channel
*uchan
= NULL
;
226 struct lttng_channel
*defattr
= NULL
;
228 /* Creating channel attributes if needed */
230 defattr
= channel_new_default_attr(domain
);
231 if (defattr
== NULL
) {
238 /* Create UST channel */
239 uchan
= trace_ust_create_channel(attr
, usess
->pathname
);
247 case LTTNG_DOMAIN_UST
:
248 DBG2("Channel %s being created in UST global domain", uchan
->name
);
250 /* Enable channel for global domain */
251 ret
= ust_app_create_channel_glb(usess
, uchan
);
254 case LTTNG_DOMAIN_UST_PID
:
255 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN
:
256 case LTTNG_DOMAIN_UST_EXEC_NAME
:
260 goto error_free_chan
;
263 if (ret
< 0 && ret
!= -EEXIST
) {
264 ret
= LTTCOMM_UST_CHAN_ENABLE_FAIL
;
265 goto error_free_chan
;
268 /* Adding the channel to the channel hash table. */
270 lttng_ht_add_unique_str(usess
->domain_global
.channels
, &uchan
->node
);
273 DBG2("Channel %s created successfully", uchan
->name
);
280 * No need to remove the channel from the hash table because at this point
281 * it was not added hence the direct call and no call_rcu().
283 trace_ust_destroy_channel(uchan
);
290 * Disable UST channel for session and domain.
292 int channel_ust_disable(struct ltt_ust_session
*usess
, int domain
,
293 struct ltt_ust_channel
*uchan
)
295 int ret
= LTTCOMM_OK
;
297 /* Already disabled */
298 if (uchan
->enabled
== 0) {
299 DBG2("Channel UST %s already disabled", uchan
->name
);
303 /* Get the right channel's hashtable */
305 case LTTNG_DOMAIN_UST
:
306 DBG2("Channel %s being disabled in UST global domain", uchan
->name
);
307 /* Disable channel for global domain */
308 ret
= ust_app_disable_channel_glb(usess
, uchan
);
311 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN
:
312 case LTTNG_DOMAIN_UST_EXEC_NAME
:
313 case LTTNG_DOMAIN_UST_PID
:
320 if (ret
< 0 && ret
!= -EEXIST
) {
321 ret
= LTTCOMM_UST_DISABLE_FAIL
;
327 DBG2("Channel %s disabled successfully", uchan
->name
);