Commit | Line | Data |
---|---|---|
54d01ffb DG |
1 | /* |
2 | * Copyright (C) 2011 - David Goulet <david.goulet@polymtl.ca> | |
bdf64013 | 3 | * Copyright (C) 2016 - Jérémie Galarneau <jeremie.galarneau@efficios.com> |
54d01ffb | 4 | * |
d14d33bf AM |
5 | * This program is free software; you can redistribute it and/or modify |
6 | * it under the terms of the GNU General Public License, version 2 only, | |
7 | * as published by the Free Software Foundation. | |
54d01ffb | 8 | * |
d14d33bf AM |
9 | * This program is distributed in the hope that it will be useful, |
10 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
12 | * GNU General Public License for more details. | |
54d01ffb | 13 | * |
d14d33bf AM |
14 | * You should have received a copy of the GNU General Public License along |
15 | * with this program; if not, write to the Free Software Foundation, Inc., | |
16 | * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. | |
54d01ffb DG |
17 | */ |
18 | ||
6c1c0768 | 19 | #define _LGPL_SOURCE |
7972aab2 | 20 | #include <inttypes.h> |
56fff090 | 21 | #include <string.h> |
54d01ffb DG |
22 | #include <unistd.h> |
23 | ||
990570ed DG |
24 | #include <common/common.h> |
25 | #include <common/defaults.h> | |
db758600 | 26 | #include <common/sessiond-comm/sessiond-comm.h> |
54d01ffb DG |
27 | |
28 | #include "channel.h" | |
12744796 | 29 | #include "lttng-sessiond.h" |
4771f025 | 30 | #include "kernel.h" |
44d3bd01 | 31 | #include "ust-ctl.h" |
54d01ffb | 32 | #include "utils.h" |
7885e399 | 33 | #include "ust-app.h" |
b63d638b | 34 | #include "agent.h" |
54d01ffb DG |
35 | |
36 | /* | |
37 | * Return allocated channel attributes. | |
38 | */ | |
0a9c6494 DG |
39 | struct lttng_channel *channel_new_default_attr(int dom, |
40 | enum lttng_buffer_type type) | |
54d01ffb DG |
41 | { |
42 | struct lttng_channel *chan; | |
bdf64013 | 43 | const char *channel_name = DEFAULT_CHANNEL_NAME; |
e9404c27 | 44 | struct lttng_channel_extended *extended_attr = NULL; |
54d01ffb DG |
45 | |
46 | chan = zmalloc(sizeof(struct lttng_channel)); | |
47 | if (chan == NULL) { | |
7885e399 | 48 | PERROR("zmalloc channel init"); |
54d01ffb DG |
49 | goto error_alloc; |
50 | } | |
51 | ||
e9404c27 JG |
52 | extended_attr = zmalloc(sizeof(struct lttng_channel_extended)); |
53 | if (!extended_attr) { | |
54 | PERROR("zmalloc channel extended init"); | |
55 | goto error; | |
56 | } | |
57 | ||
58 | chan->attr.extended.ptr = extended_attr; | |
59 | ||
0a9c6494 | 60 | /* Same for all domains. */ |
54d01ffb | 61 | chan->attr.overwrite = DEFAULT_CHANNEL_OVERWRITE; |
0a9c6494 DG |
62 | chan->attr.tracefile_size = DEFAULT_CHANNEL_TRACEFILE_SIZE; |
63 | chan->attr.tracefile_count = DEFAULT_CHANNEL_TRACEFILE_COUNT; | |
54d01ffb DG |
64 | |
65 | switch (dom) { | |
1b1c65fa | 66 | case LTTNG_DOMAIN_KERNEL: |
0a9c6494 | 67 | assert(type == LTTNG_BUFFER_GLOBAL); |
3e230f92 SM |
68 | chan->attr.subbuf_size = |
69 | default_get_kernel_channel_subbuf_size(); | |
1b1c65fa MD |
70 | chan->attr.num_subbuf = DEFAULT_KERNEL_CHANNEL_SUBBUF_NUM; |
71 | chan->attr.output = DEFAULT_KERNEL_CHANNEL_OUTPUT; | |
6bb9e85f MD |
72 | chan->attr.switch_timer_interval = DEFAULT_KERNEL_CHANNEL_SWITCH_TIMER; |
73 | chan->attr.read_timer_interval = DEFAULT_KERNEL_CHANNEL_READ_TIMER; | |
ecc48a90 | 74 | chan->attr.live_timer_interval = DEFAULT_KERNEL_CHANNEL_LIVE_TIMER; |
e9404c27 JG |
75 | extended_attr->monitor_timer_interval = |
76 | DEFAULT_KERNEL_CHANNEL_MONITOR_TIMER; | |
1b1c65fa | 77 | break; |
bdf64013 JG |
78 | case LTTNG_DOMAIN_JUL: |
79 | channel_name = DEFAULT_JUL_CHANNEL_NAME; | |
80 | goto common_ust; | |
81 | case LTTNG_DOMAIN_LOG4J: | |
82 | channel_name = DEFAULT_LOG4J_CHANNEL_NAME; | |
83 | goto common_ust; | |
84 | case LTTNG_DOMAIN_PYTHON: | |
85 | channel_name = DEFAULT_PYTHON_CHANNEL_NAME; | |
86 | goto common_ust; | |
1b1c65fa | 87 | case LTTNG_DOMAIN_UST: |
bdf64013 | 88 | common_ust: |
0a9c6494 DG |
89 | switch (type) { |
90 | case LTTNG_BUFFER_PER_UID: | |
91 | chan->attr.subbuf_size = default_get_ust_uid_channel_subbuf_size(); | |
92 | chan->attr.num_subbuf = DEFAULT_UST_UID_CHANNEL_SUBBUF_NUM; | |
93 | chan->attr.output = DEFAULT_UST_UID_CHANNEL_OUTPUT; | |
94 | chan->attr.switch_timer_interval = | |
95 | DEFAULT_UST_UID_CHANNEL_SWITCH_TIMER; | |
96 | chan->attr.read_timer_interval = | |
97 | DEFAULT_UST_UID_CHANNEL_READ_TIMER; | |
ecc48a90 JD |
98 | chan->attr.live_timer_interval = |
99 | DEFAULT_UST_UID_CHANNEL_LIVE_TIMER; | |
e9404c27 JG |
100 | extended_attr->monitor_timer_interval = |
101 | DEFAULT_UST_UID_CHANNEL_MONITOR_TIMER; | |
0a9c6494 DG |
102 | break; |
103 | case LTTNG_BUFFER_PER_PID: | |
104 | default: | |
105 | chan->attr.subbuf_size = default_get_ust_pid_channel_subbuf_size(); | |
106 | chan->attr.num_subbuf = DEFAULT_UST_PID_CHANNEL_SUBBUF_NUM; | |
107 | chan->attr.output = DEFAULT_UST_PID_CHANNEL_OUTPUT; | |
108 | chan->attr.switch_timer_interval = | |
109 | DEFAULT_UST_PID_CHANNEL_SWITCH_TIMER; | |
110 | chan->attr.read_timer_interval = | |
111 | DEFAULT_UST_PID_CHANNEL_READ_TIMER; | |
ecc48a90 | 112 | chan->attr.live_timer_interval = |
e9404c27 JG |
113 | DEFAULT_UST_PID_CHANNEL_LIVE_TIMER; |
114 | extended_attr->monitor_timer_interval = | |
115 | DEFAULT_UST_PID_CHANNEL_MONITOR_TIMER; | |
0a9c6494 DG |
116 | break; |
117 | } | |
1b1c65fa MD |
118 | break; |
119 | default: | |
120 | goto error; /* Not implemented */ | |
54d01ffb DG |
121 | } |
122 | ||
bdf64013 JG |
123 | if (snprintf(chan->name, sizeof(chan->name), "%s", |
124 | channel_name) < 0) { | |
125 | PERROR("snprintf default channel name"); | |
126 | goto error; | |
127 | } | |
54d01ffb DG |
128 | return chan; |
129 | ||
130 | error: | |
e9404c27 | 131 | free(extended_attr); |
54d01ffb DG |
132 | free(chan); |
133 | error_alloc: | |
134 | return NULL; | |
135 | } | |
136 | ||
e9404c27 JG |
137 | void channel_attr_destroy(struct lttng_channel *channel) |
138 | { | |
139 | if (!channel) { | |
140 | return; | |
141 | } | |
142 | free(channel->attr.extended.ptr); | |
143 | free(channel); | |
144 | } | |
145 | ||
54d01ffb DG |
146 | /* |
147 | * Disable kernel channel of the kernel session. | |
148 | */ | |
149 | int channel_kernel_disable(struct ltt_kernel_session *ksession, | |
150 | char *channel_name) | |
151 | { | |
152 | int ret; | |
153 | struct ltt_kernel_channel *kchan; | |
154 | ||
0525e9ae DG |
155 | assert(ksession); |
156 | assert(channel_name); | |
157 | ||
54d01ffb DG |
158 | kchan = trace_kernel_get_channel_by_name(channel_name, ksession); |
159 | if (kchan == NULL) { | |
f73fabfd | 160 | ret = LTTNG_ERR_KERN_CHAN_NOT_FOUND; |
54d01ffb | 161 | goto error; |
0525e9ae DG |
162 | } |
163 | ||
164 | /* Only if channel is enabled disable it. */ | |
165 | if (kchan->enabled == 1) { | |
54d01ffb | 166 | ret = kernel_disable_channel(kchan); |
7885e399 | 167 | if (ret < 0 && ret != -EEXIST) { |
f73fabfd | 168 | ret = LTTNG_ERR_KERN_CHAN_DISABLE_FAIL; |
54d01ffb DG |
169 | goto error; |
170 | } | |
171 | } | |
172 | ||
f73fabfd | 173 | ret = LTTNG_OK; |
54d01ffb DG |
174 | |
175 | error: | |
176 | return ret; | |
177 | } | |
178 | ||
179 | /* | |
180 | * Enable kernel channel of the kernel session. | |
181 | */ | |
182 | int channel_kernel_enable(struct ltt_kernel_session *ksession, | |
183 | struct ltt_kernel_channel *kchan) | |
184 | { | |
185 | int ret; | |
186 | ||
0525e9ae DG |
187 | assert(ksession); |
188 | assert(kchan); | |
189 | ||
54d01ffb DG |
190 | if (kchan->enabled == 0) { |
191 | ret = kernel_enable_channel(kchan); | |
192 | if (ret < 0) { | |
f73fabfd | 193 | ret = LTTNG_ERR_KERN_CHAN_ENABLE_FAIL; |
54d01ffb DG |
194 | goto error; |
195 | } | |
42224349 | 196 | } else { |
f73fabfd | 197 | ret = LTTNG_ERR_KERN_CHAN_EXIST; |
42224349 | 198 | goto error; |
54d01ffb DG |
199 | } |
200 | ||
f73fabfd | 201 | ret = LTTNG_OK; |
54d01ffb DG |
202 | |
203 | error: | |
204 | return ret; | |
205 | } | |
206 | ||
da9d9d9c MD |
207 | static int channel_validate(struct lttng_channel *attr) |
208 | { | |
209 | /* | |
210 | * The ringbuffer (both in user space and kernel) behaves badly | |
211 | * in overwrite mode and with less than 2 subbuffers so block it | |
212 | * right away and send back an invalid attribute error. | |
213 | */ | |
214 | if (attr->attr.overwrite && attr->attr.num_subbuf < 2) { | |
215 | return -1; | |
216 | } | |
217 | return 0; | |
218 | } | |
219 | ||
54d01ffb DG |
220 | /* |
221 | * Create kernel channel of the kernel session and notify kernel thread. | |
222 | */ | |
223 | int channel_kernel_create(struct ltt_kernel_session *ksession, | |
ff4d74e6 | 224 | struct lttng_channel *attr, int kernel_pipe) |
54d01ffb DG |
225 | { |
226 | int ret; | |
ff4d74e6 | 227 | struct lttng_channel *defattr = NULL; |
54d01ffb | 228 | |
0525e9ae DG |
229 | assert(ksession); |
230 | ||
54d01ffb DG |
231 | /* Creating channel attributes if needed */ |
232 | if (attr == NULL) { | |
0a9c6494 DG |
233 | defattr = channel_new_default_attr(LTTNG_DOMAIN_KERNEL, |
234 | LTTNG_BUFFER_GLOBAL); | |
ff4d74e6 | 235 | if (defattr == NULL) { |
f73fabfd | 236 | ret = LTTNG_ERR_FATAL; |
54d01ffb DG |
237 | goto error; |
238 | } | |
ff4d74e6 | 239 | attr = defattr; |
54d01ffb DG |
240 | } |
241 | ||
8d5841ea MD |
242 | /* |
243 | * Set the overwrite mode for this channel based on the session | |
244 | * type unless the client explicitly overrides the channel mode. | |
245 | */ | |
246 | if (attr->attr.overwrite == DEFAULT_CHANNEL_OVERWRITE) { | |
247 | attr->attr.overwrite = !!ksession->snapshot_mode; | |
248 | } | |
249 | ||
250 | /* Enforce mmap output for snapshot sessions. */ | |
27babd3a | 251 | if (ksession->snapshot_mode) { |
27babd3a DG |
252 | attr->attr.output = LTTNG_EVENT_MMAP; |
253 | } | |
254 | ||
da9d9d9c MD |
255 | /* Validate common channel properties. */ |
256 | if (channel_validate(attr) < 0) { | |
257 | ret = LTTNG_ERR_INVALID; | |
258 | goto error; | |
259 | } | |
260 | ||
54d01ffb | 261 | /* Channel not found, creating it */ |
fdd9eb17 | 262 | ret = kernel_create_channel(ksession, attr); |
54d01ffb | 263 | if (ret < 0) { |
f73fabfd | 264 | ret = LTTNG_ERR_KERN_CHAN_FAIL; |
54d01ffb DG |
265 | goto error; |
266 | } | |
267 | ||
268 | /* Notify kernel thread that there is a new channel */ | |
269 | ret = notify_thread_pipe(kernel_pipe); | |
270 | if (ret < 0) { | |
f73fabfd | 271 | ret = LTTNG_ERR_FATAL; |
54d01ffb DG |
272 | goto error; |
273 | } | |
274 | ||
f73fabfd | 275 | ret = LTTNG_OK; |
54d01ffb | 276 | error: |
e9404c27 | 277 | channel_attr_destroy(defattr); |
54d01ffb DG |
278 | return ret; |
279 | } | |
7885e399 DG |
280 | |
281 | /* | |
282 | * Enable UST channel for session and domain. | |
283 | */ | |
7972aab2 | 284 | int channel_ust_enable(struct ltt_ust_session *usess, |
7885e399 DG |
285 | struct ltt_ust_channel *uchan) |
286 | { | |
f73fabfd | 287 | int ret = LTTNG_OK; |
7885e399 | 288 | |
0525e9ae DG |
289 | assert(usess); |
290 | assert(uchan); | |
291 | ||
7885e399 DG |
292 | /* If already enabled, everything is OK */ |
293 | if (uchan->enabled) { | |
294 | DBG3("Channel %s already enabled. Skipping", uchan->name); | |
f73fabfd | 295 | ret = LTTNG_ERR_UST_CHAN_EXIST; |
7885e399 DG |
296 | goto end; |
297 | } | |
298 | ||
7972aab2 DG |
299 | DBG2("Channel %s being enabled in UST domain", uchan->name); |
300 | ||
301 | /* | |
302 | * Enable channel for UST global domain on all applications. Ignore return | |
303 | * value here since whatever error we got, it means that the channel was | |
304 | * not created on one or many registered applications and we can not report | |
305 | * this to the user yet. However, at this stage, the channel was | |
306 | * successfully created on the session daemon side so the enable-channel | |
307 | * command is a success. | |
308 | */ | |
d54b4440 | 309 | (void) ust_app_enable_channel_glb(usess, uchan); |
7885e399 | 310 | |
7885e399 DG |
311 | uchan->enabled = 1; |
312 | DBG2("Channel %s enabled successfully", uchan->name); | |
313 | ||
314 | end: | |
7885e399 DG |
315 | return ret; |
316 | } | |
317 | ||
318 | /* | |
319 | * Create UST channel for session and domain. | |
320 | */ | |
7972aab2 DG |
321 | int channel_ust_create(struct ltt_ust_session *usess, |
322 | struct lttng_channel *attr, enum lttng_buffer_type type) | |
7885e399 | 323 | { |
f73fabfd | 324 | int ret = LTTNG_OK; |
7885e399 DG |
325 | struct ltt_ust_channel *uchan = NULL; |
326 | struct lttng_channel *defattr = NULL; | |
b63d638b | 327 | enum lttng_domain_type domain = LTTNG_DOMAIN_UST; |
7885e399 | 328 | |
0525e9ae DG |
329 | assert(usess); |
330 | ||
7885e399 DG |
331 | /* Creating channel attributes if needed */ |
332 | if (attr == NULL) { | |
0a9c6494 | 333 | defattr = channel_new_default_attr(LTTNG_DOMAIN_UST, type); |
7885e399 | 334 | if (defattr == NULL) { |
f73fabfd | 335 | ret = LTTNG_ERR_FATAL; |
7885e399 DG |
336 | goto error; |
337 | } | |
338 | attr = defattr; | |
b63d638b JG |
339 | } else { |
340 | /* | |
341 | * HACK: Set the channel's subdomain (JUL, Log4j, Python, etc.) | |
342 | * based on the default name. | |
343 | */ | |
344 | if (!strcmp(attr->name, DEFAULT_JUL_CHANNEL_NAME)) { | |
345 | domain = LTTNG_DOMAIN_JUL; | |
346 | } else if (!strcmp(attr->name, DEFAULT_LOG4J_CHANNEL_NAME)) { | |
347 | domain = LTTNG_DOMAIN_LOG4J; | |
348 | } else if (!strcmp(attr->name, DEFAULT_PYTHON_CHANNEL_NAME)) { | |
349 | domain = LTTNG_DOMAIN_PYTHON; | |
350 | } | |
7885e399 DG |
351 | } |
352 | ||
8d5841ea MD |
353 | /* |
354 | * Set the overwrite mode for this channel based on the session | |
355 | * type unless the client explicitly overrides the channel mode. | |
356 | */ | |
357 | if (attr->attr.overwrite == DEFAULT_CHANNEL_OVERWRITE) { | |
358 | attr->attr.overwrite = !!usess->snapshot_mode; | |
359 | } | |
360 | ||
361 | /* Enforce mmap output for snapshot sessions. */ | |
27babd3a | 362 | if (usess->snapshot_mode) { |
27babd3a DG |
363 | attr->attr.output = LTTNG_EVENT_MMAP; |
364 | } | |
365 | ||
da9d9d9c MD |
366 | /* Validate common channel properties. */ |
367 | if (channel_validate(attr) < 0) { | |
368 | ret = LTTNG_ERR_INVALID; | |
369 | goto error; | |
370 | } | |
371 | ||
b024d072 | 372 | /* |
0525e9ae DG |
373 | * Validate UST buffer size and number of buffers: must both be power of 2 |
374 | * and nonzero. We validate right here for UST, because applications will | |
375 | * not report the error to the user (unlike kernel tracing). | |
b024d072 | 376 | */ |
0525e9ae DG |
377 | if (!attr->attr.subbuf_size || |
378 | (attr->attr.subbuf_size & (attr->attr.subbuf_size - 1))) { | |
f73fabfd | 379 | ret = LTTNG_ERR_INVALID; |
b024d072 MD |
380 | goto error; |
381 | } | |
0525e9ae | 382 | |
12744796 DG |
383 | /* |
384 | * Invalid subbuffer size if it's lower then the page size. | |
385 | */ | |
386 | if (attr->attr.subbuf_size < page_size) { | |
387 | ret = LTTNG_ERR_INVALID; | |
388 | goto error; | |
389 | } | |
390 | ||
0525e9ae DG |
391 | if (!attr->attr.num_subbuf || |
392 | (attr->attr.num_subbuf & (attr->attr.num_subbuf - 1))) { | |
f73fabfd | 393 | ret = LTTNG_ERR_INVALID; |
b024d072 MD |
394 | goto error; |
395 | } | |
396 | ||
a79d84dd DG |
397 | if (attr->attr.output != LTTNG_EVENT_MMAP) { |
398 | ret = LTTNG_ERR_NOT_SUPPORTED; | |
399 | goto error; | |
400 | } | |
401 | ||
1624d5b7 JD |
402 | /* |
403 | * The tracefile_size should not be < to the subbuf_size, otherwise | |
404 | * we won't be able to write the packets on disk | |
405 | */ | |
406 | if ((attr->attr.tracefile_size > 0) && | |
407 | (attr->attr.tracefile_size < attr->attr.subbuf_size)) { | |
408 | ret = LTTNG_ERR_INVALID; | |
409 | goto error; | |
410 | } | |
411 | ||
2e8269f7 DG |
412 | /* Validate buffer type. */ |
413 | switch (type) { | |
414 | case LTTNG_BUFFER_PER_PID: | |
0a9c6494 | 415 | break; |
2e8269f7 DG |
416 | case LTTNG_BUFFER_PER_UID: |
417 | break; | |
418 | default: | |
419 | ret = LTTNG_ERR_BUFFER_NOT_SUPPORTED; | |
420 | goto error; | |
421 | } | |
422 | ||
7885e399 | 423 | /* Create UST channel */ |
b63d638b | 424 | uchan = trace_ust_create_channel(attr, domain); |
7885e399 | 425 | if (uchan == NULL) { |
f73fabfd | 426 | ret = LTTNG_ERR_FATAL; |
7885e399 DG |
427 | goto error; |
428 | } | |
51755dc8 | 429 | |
58f3ca76 | 430 | uchan->enabled = 1; |
7972aab2 DG |
431 | if (trace_ust_is_max_id(usess->used_channel_id)) { |
432 | ret = LTTNG_ERR_UST_CHAN_FAIL; | |
433 | goto error; | |
434 | } | |
435 | uchan->id = trace_ust_get_next_chan_id(usess); | |
436 | ||
437 | DBG2("Channel %s is being created for UST with buffer %d and id %" PRIu64, | |
438 | uchan->name, type, uchan->id); | |
439 | ||
440 | /* Flag session buffer type. */ | |
441 | if (!usess->buffer_type_changed) { | |
442 | usess->buffer_type = type; | |
443 | usess->buffer_type_changed = 1; | |
444 | } else if (usess->buffer_type != type) { | |
445 | /* Buffer type was already set. Refuse to create channel. */ | |
446 | ret = LTTNG_ERR_BUFFER_TYPE_MISMATCH; | |
7885e399 DG |
447 | goto error_free_chan; |
448 | } | |
449 | ||
7972aab2 DG |
450 | /* Enable channel for global domain */ |
451 | ret = ust_app_create_channel_glb(usess, uchan); | |
49c336c1 | 452 | if (ret < 0 && ret != -LTTNG_UST_ERR_EXIST) { |
f73fabfd | 453 | ret = LTTNG_ERR_UST_CHAN_FAIL; |
7885e399 DG |
454 | goto error_free_chan; |
455 | } | |
456 | ||
fc34caaa DG |
457 | /* Adding the channel to the channel hash table. */ |
458 | rcu_read_lock(); | |
ad7a9107 DG |
459 | if (strncmp(uchan->name, DEFAULT_METADATA_NAME, |
460 | sizeof(uchan->name))) { | |
461 | lttng_ht_add_unique_str(usess->domain_global.channels, &uchan->node); | |
84ad93e8 DG |
462 | } else { |
463 | /* | |
464 | * Copy channel attribute to session if this is metadata so if NO | |
465 | * application exists we can access that data in the shadow copy during | |
466 | * the global update of newly registered application. | |
467 | */ | |
468 | memcpy(&usess->metadata_attr, &uchan->attr, | |
469 | sizeof(usess->metadata_attr)); | |
ad7a9107 | 470 | } |
fc34caaa DG |
471 | rcu_read_unlock(); |
472 | ||
7885e399 | 473 | DBG2("Channel %s created successfully", uchan->name); |
b63d638b JG |
474 | if (domain != LTTNG_DOMAIN_UST) { |
475 | struct agent *agt = trace_ust_find_agent(usess, domain); | |
476 | ||
477 | if (!agt) { | |
478 | agt = agent_create(domain); | |
479 | if (!agt) { | |
480 | ret = LTTNG_ERR_NOMEM; | |
481 | goto error_free_chan; | |
482 | } | |
483 | agent_add(agt, usess->agents); | |
484 | } | |
485 | } | |
7885e399 | 486 | |
e9404c27 | 487 | channel_attr_destroy(defattr); |
f73fabfd | 488 | return LTTNG_OK; |
7885e399 DG |
489 | |
490 | error_free_chan: | |
24d1723f DG |
491 | /* |
492 | * No need to remove the channel from the hash table because at this point | |
493 | * it was not added hence the direct call and no call_rcu(). | |
494 | */ | |
7885e399 DG |
495 | trace_ust_destroy_channel(uchan); |
496 | error: | |
e9404c27 | 497 | channel_attr_destroy(defattr); |
7885e399 DG |
498 | return ret; |
499 | } | |
500 | ||
501 | /* | |
502 | * Disable UST channel for session and domain. | |
503 | */ | |
7972aab2 | 504 | int channel_ust_disable(struct ltt_ust_session *usess, |
7885e399 DG |
505 | struct ltt_ust_channel *uchan) |
506 | { | |
f73fabfd | 507 | int ret = LTTNG_OK; |
7885e399 | 508 | |
0525e9ae DG |
509 | assert(usess); |
510 | assert(uchan); | |
511 | ||
7885e399 DG |
512 | /* Already disabled */ |
513 | if (uchan->enabled == 0) { | |
514 | DBG2("Channel UST %s already disabled", uchan->name); | |
515 | goto end; | |
516 | } | |
517 | ||
7972aab2 DG |
518 | DBG2("Channel %s being disabled in UST global domain", uchan->name); |
519 | /* Disable channel for global domain */ | |
520 | ret = ust_app_disable_channel_glb(usess, uchan); | |
49c336c1 | 521 | if (ret < 0 && ret != -LTTNG_UST_ERR_EXIST) { |
f73fabfd | 522 | ret = LTTNG_ERR_UST_CHAN_DISABLE_FAIL; |
7885e399 DG |
523 | goto error; |
524 | } | |
525 | ||
526 | uchan->enabled = 0; | |
527 | ||
528 | DBG2("Channel %s disabled successfully", uchan->name); | |
529 | ||
f73fabfd | 530 | return LTTNG_OK; |
7885e399 DG |
531 | |
532 | end: | |
533 | error: | |
534 | return ret; | |
535 | } |