Commit | Line | Data |
---|---|---|
54d01ffb | 1 | /* |
ab5be9fa MJ |
2 | * Copyright (C) 2011 David Goulet <david.goulet@polymtl.ca> |
3 | * Copyright (C) 2016 Jérémie Galarneau <jeremie.galarneau@efficios.com> | |
54d01ffb | 4 | * |
ab5be9fa | 5 | * SPDX-License-Identifier: GPL-2.0-only |
54d01ffb | 6 | * |
54d01ffb DG |
7 | */ |
8 | ||
6c1c0768 | 9 | #define _LGPL_SOURCE |
7972aab2 | 10 | #include <inttypes.h> |
56fff090 | 11 | #include <string.h> |
54d01ffb DG |
12 | #include <unistd.h> |
13 | ||
990570ed DG |
14 | #include <common/common.h> |
15 | #include <common/defaults.h> | |
db758600 | 16 | #include <common/sessiond-comm/sessiond-comm.h> |
54d01ffb DG |
17 | |
18 | #include "channel.h" | |
12744796 | 19 | #include "lttng-sessiond.h" |
4771f025 | 20 | #include "kernel.h" |
75018ab6 JG |
21 | #include "lttng-ust-ctl.h" |
22 | #include "lttng-ust-error.h" | |
54d01ffb | 23 | #include "utils.h" |
7885e399 | 24 | #include "ust-app.h" |
b63d638b | 25 | #include "agent.h" |
54d01ffb DG |
26 | |
27 | /* | |
28 | * Return allocated channel attributes. | |
29 | */ | |
0a9c6494 DG |
30 | struct lttng_channel *channel_new_default_attr(int dom, |
31 | enum lttng_buffer_type type) | |
54d01ffb DG |
32 | { |
33 | struct lttng_channel *chan; | |
bdf64013 | 34 | const char *channel_name = DEFAULT_CHANNEL_NAME; |
e9404c27 | 35 | struct lttng_channel_extended *extended_attr = NULL; |
54d01ffb DG |
36 | |
37 | chan = zmalloc(sizeof(struct lttng_channel)); | |
38 | if (chan == NULL) { | |
7885e399 | 39 | PERROR("zmalloc channel init"); |
54d01ffb DG |
40 | goto error_alloc; |
41 | } | |
42 | ||
e9404c27 JG |
43 | extended_attr = zmalloc(sizeof(struct lttng_channel_extended)); |
44 | if (!extended_attr) { | |
45 | PERROR("zmalloc channel extended init"); | |
46 | goto error; | |
47 | } | |
48 | ||
49 | chan->attr.extended.ptr = extended_attr; | |
50 | ||
0a9c6494 | 51 | /* Same for all domains. */ |
54d01ffb | 52 | chan->attr.overwrite = DEFAULT_CHANNEL_OVERWRITE; |
0a9c6494 DG |
53 | chan->attr.tracefile_size = DEFAULT_CHANNEL_TRACEFILE_SIZE; |
54 | chan->attr.tracefile_count = DEFAULT_CHANNEL_TRACEFILE_COUNT; | |
54d01ffb DG |
55 | |
56 | switch (dom) { | |
1b1c65fa | 57 | case LTTNG_DOMAIN_KERNEL: |
a0377dfe | 58 | LTTNG_ASSERT(type == LTTNG_BUFFER_GLOBAL); |
3e230f92 SM |
59 | chan->attr.subbuf_size = |
60 | default_get_kernel_channel_subbuf_size(); | |
1b1c65fa MD |
61 | chan->attr.num_subbuf = DEFAULT_KERNEL_CHANNEL_SUBBUF_NUM; |
62 | chan->attr.output = DEFAULT_KERNEL_CHANNEL_OUTPUT; | |
6bb9e85f MD |
63 | chan->attr.switch_timer_interval = DEFAULT_KERNEL_CHANNEL_SWITCH_TIMER; |
64 | chan->attr.read_timer_interval = DEFAULT_KERNEL_CHANNEL_READ_TIMER; | |
ecc48a90 | 65 | chan->attr.live_timer_interval = DEFAULT_KERNEL_CHANNEL_LIVE_TIMER; |
491d1539 | 66 | extended_attr->blocking_timeout = DEFAULT_KERNEL_CHANNEL_BLOCKING_TIMEOUT; |
e9404c27 JG |
67 | extended_attr->monitor_timer_interval = |
68 | DEFAULT_KERNEL_CHANNEL_MONITOR_TIMER; | |
1b1c65fa | 69 | break; |
bdf64013 JG |
70 | case LTTNG_DOMAIN_JUL: |
71 | channel_name = DEFAULT_JUL_CHANNEL_NAME; | |
72 | goto common_ust; | |
73 | case LTTNG_DOMAIN_LOG4J: | |
74 | channel_name = DEFAULT_LOG4J_CHANNEL_NAME; | |
75 | goto common_ust; | |
76 | case LTTNG_DOMAIN_PYTHON: | |
77 | channel_name = DEFAULT_PYTHON_CHANNEL_NAME; | |
78 | goto common_ust; | |
1b1c65fa | 79 | case LTTNG_DOMAIN_UST: |
bdf64013 | 80 | common_ust: |
0a9c6494 DG |
81 | switch (type) { |
82 | case LTTNG_BUFFER_PER_UID: | |
83 | chan->attr.subbuf_size = default_get_ust_uid_channel_subbuf_size(); | |
84 | chan->attr.num_subbuf = DEFAULT_UST_UID_CHANNEL_SUBBUF_NUM; | |
85 | chan->attr.output = DEFAULT_UST_UID_CHANNEL_OUTPUT; | |
86 | chan->attr.switch_timer_interval = | |
87 | DEFAULT_UST_UID_CHANNEL_SWITCH_TIMER; | |
88 | chan->attr.read_timer_interval = | |
89 | DEFAULT_UST_UID_CHANNEL_READ_TIMER; | |
ecc48a90 JD |
90 | chan->attr.live_timer_interval = |
91 | DEFAULT_UST_UID_CHANNEL_LIVE_TIMER; | |
491d1539 | 92 | extended_attr->blocking_timeout = DEFAULT_UST_UID_CHANNEL_BLOCKING_TIMEOUT; |
e9404c27 JG |
93 | extended_attr->monitor_timer_interval = |
94 | DEFAULT_UST_UID_CHANNEL_MONITOR_TIMER; | |
0a9c6494 DG |
95 | break; |
96 | case LTTNG_BUFFER_PER_PID: | |
97 | default: | |
98 | chan->attr.subbuf_size = default_get_ust_pid_channel_subbuf_size(); | |
99 | chan->attr.num_subbuf = DEFAULT_UST_PID_CHANNEL_SUBBUF_NUM; | |
100 | chan->attr.output = DEFAULT_UST_PID_CHANNEL_OUTPUT; | |
101 | chan->attr.switch_timer_interval = | |
102 | DEFAULT_UST_PID_CHANNEL_SWITCH_TIMER; | |
103 | chan->attr.read_timer_interval = | |
104 | DEFAULT_UST_PID_CHANNEL_READ_TIMER; | |
ecc48a90 | 105 | chan->attr.live_timer_interval = |
e9404c27 | 106 | DEFAULT_UST_PID_CHANNEL_LIVE_TIMER; |
491d1539 | 107 | extended_attr->blocking_timeout = DEFAULT_UST_PID_CHANNEL_BLOCKING_TIMEOUT; |
e9404c27 JG |
108 | extended_attr->monitor_timer_interval = |
109 | DEFAULT_UST_PID_CHANNEL_MONITOR_TIMER; | |
0a9c6494 DG |
110 | break; |
111 | } | |
1b1c65fa MD |
112 | break; |
113 | default: | |
114 | goto error; /* Not implemented */ | |
54d01ffb DG |
115 | } |
116 | ||
bdf64013 JG |
117 | if (snprintf(chan->name, sizeof(chan->name), "%s", |
118 | channel_name) < 0) { | |
119 | PERROR("snprintf default channel name"); | |
120 | goto error; | |
121 | } | |
54d01ffb DG |
122 | return chan; |
123 | ||
124 | error: | |
e9404c27 | 125 | free(extended_attr); |
54d01ffb DG |
126 | free(chan); |
127 | error_alloc: | |
128 | return NULL; | |
129 | } | |
130 | ||
e9404c27 JG |
131 | void channel_attr_destroy(struct lttng_channel *channel) |
132 | { | |
133 | if (!channel) { | |
134 | return; | |
135 | } | |
136 | free(channel->attr.extended.ptr); | |
137 | free(channel); | |
138 | } | |
139 | ||
54d01ffb DG |
140 | /* |
141 | * Disable kernel channel of the kernel session. | |
142 | */ | |
143 | int channel_kernel_disable(struct ltt_kernel_session *ksession, | |
144 | char *channel_name) | |
145 | { | |
146 | int ret; | |
147 | struct ltt_kernel_channel *kchan; | |
148 | ||
a0377dfe FD |
149 | LTTNG_ASSERT(ksession); |
150 | LTTNG_ASSERT(channel_name); | |
0525e9ae | 151 | |
54d01ffb DG |
152 | kchan = trace_kernel_get_channel_by_name(channel_name, ksession); |
153 | if (kchan == NULL) { | |
f73fabfd | 154 | ret = LTTNG_ERR_KERN_CHAN_NOT_FOUND; |
54d01ffb | 155 | goto error; |
0525e9ae DG |
156 | } |
157 | ||
158 | /* Only if channel is enabled disable it. */ | |
159 | if (kchan->enabled == 1) { | |
54d01ffb | 160 | ret = kernel_disable_channel(kchan); |
7885e399 | 161 | if (ret < 0 && ret != -EEXIST) { |
f73fabfd | 162 | ret = LTTNG_ERR_KERN_CHAN_DISABLE_FAIL; |
54d01ffb DG |
163 | goto error; |
164 | } | |
165 | } | |
166 | ||
f73fabfd | 167 | ret = LTTNG_OK; |
54d01ffb DG |
168 | |
169 | error: | |
170 | return ret; | |
171 | } | |
172 | ||
173 | /* | |
174 | * Enable kernel channel of the kernel session. | |
175 | */ | |
176 | int channel_kernel_enable(struct ltt_kernel_session *ksession, | |
177 | struct ltt_kernel_channel *kchan) | |
178 | { | |
179 | int ret; | |
180 | ||
a0377dfe FD |
181 | LTTNG_ASSERT(ksession); |
182 | LTTNG_ASSERT(kchan); | |
0525e9ae | 183 | |
54d01ffb DG |
184 | if (kchan->enabled == 0) { |
185 | ret = kernel_enable_channel(kchan); | |
186 | if (ret < 0) { | |
f73fabfd | 187 | ret = LTTNG_ERR_KERN_CHAN_ENABLE_FAIL; |
54d01ffb DG |
188 | goto error; |
189 | } | |
42224349 | 190 | } else { |
f73fabfd | 191 | ret = LTTNG_ERR_KERN_CHAN_EXIST; |
42224349 | 192 | goto error; |
54d01ffb DG |
193 | } |
194 | ||
f73fabfd | 195 | ret = LTTNG_OK; |
54d01ffb DG |
196 | |
197 | error: | |
198 | return ret; | |
199 | } | |
200 | ||
da9d9d9c MD |
201 | static int channel_validate(struct lttng_channel *attr) |
202 | { | |
203 | /* | |
204 | * The ringbuffer (both in user space and kernel) behaves badly | |
205 | * in overwrite mode and with less than 2 subbuffers so block it | |
206 | * right away and send back an invalid attribute error. | |
207 | */ | |
208 | if (attr->attr.overwrite && attr->attr.num_subbuf < 2) { | |
209 | return -1; | |
210 | } | |
211 | return 0; | |
212 | } | |
213 | ||
491d1539 MD |
214 | static int channel_validate_kernel(struct lttng_channel *attr) |
215 | { | |
216 | /* Kernel channels do not support blocking timeout. */ | |
217 | if (((struct lttng_channel_extended *)attr->attr.extended.ptr)->blocking_timeout) { | |
218 | return -1; | |
219 | } | |
220 | return 0; | |
221 | } | |
222 | ||
54d01ffb DG |
223 | /* |
224 | * Create kernel channel of the kernel session and notify kernel thread. | |
225 | */ | |
226 | int channel_kernel_create(struct ltt_kernel_session *ksession, | |
ff4d74e6 | 227 | struct lttng_channel *attr, int kernel_pipe) |
54d01ffb DG |
228 | { |
229 | int ret; | |
ff4d74e6 | 230 | struct lttng_channel *defattr = NULL; |
54d01ffb | 231 | |
a0377dfe | 232 | LTTNG_ASSERT(ksession); |
0525e9ae | 233 | |
54d01ffb DG |
234 | /* Creating channel attributes if needed */ |
235 | if (attr == NULL) { | |
0a9c6494 DG |
236 | defattr = channel_new_default_attr(LTTNG_DOMAIN_KERNEL, |
237 | LTTNG_BUFFER_GLOBAL); | |
ff4d74e6 | 238 | if (defattr == NULL) { |
f73fabfd | 239 | ret = LTTNG_ERR_FATAL; |
54d01ffb DG |
240 | goto error; |
241 | } | |
ff4d74e6 | 242 | attr = defattr; |
54d01ffb DG |
243 | } |
244 | ||
8d5841ea MD |
245 | /* |
246 | * Set the overwrite mode for this channel based on the session | |
247 | * type unless the client explicitly overrides the channel mode. | |
248 | */ | |
249 | if (attr->attr.overwrite == DEFAULT_CHANNEL_OVERWRITE) { | |
250 | attr->attr.overwrite = !!ksession->snapshot_mode; | |
251 | } | |
252 | ||
da9d9d9c MD |
253 | /* Validate common channel properties. */ |
254 | if (channel_validate(attr) < 0) { | |
255 | ret = LTTNG_ERR_INVALID; | |
256 | goto error; | |
257 | } | |
258 | ||
491d1539 MD |
259 | if (channel_validate_kernel(attr) < 0) { |
260 | ret = LTTNG_ERR_INVALID; | |
261 | goto error; | |
262 | } | |
263 | ||
54d01ffb | 264 | /* Channel not found, creating it */ |
fdd9eb17 | 265 | ret = kernel_create_channel(ksession, attr); |
54d01ffb | 266 | if (ret < 0) { |
f73fabfd | 267 | ret = LTTNG_ERR_KERN_CHAN_FAIL; |
54d01ffb DG |
268 | goto error; |
269 | } | |
270 | ||
271 | /* Notify kernel thread that there is a new channel */ | |
272 | ret = notify_thread_pipe(kernel_pipe); | |
273 | if (ret < 0) { | |
f73fabfd | 274 | ret = LTTNG_ERR_FATAL; |
54d01ffb DG |
275 | goto error; |
276 | } | |
277 | ||
f73fabfd | 278 | ret = LTTNG_OK; |
54d01ffb | 279 | error: |
e9404c27 | 280 | channel_attr_destroy(defattr); |
54d01ffb DG |
281 | return ret; |
282 | } | |
7885e399 DG |
283 | |
284 | /* | |
285 | * Enable UST channel for session and domain. | |
286 | */ | |
7972aab2 | 287 | int channel_ust_enable(struct ltt_ust_session *usess, |
7885e399 DG |
288 | struct ltt_ust_channel *uchan) |
289 | { | |
f73fabfd | 290 | int ret = LTTNG_OK; |
7885e399 | 291 | |
a0377dfe FD |
292 | LTTNG_ASSERT(usess); |
293 | LTTNG_ASSERT(uchan); | |
0525e9ae | 294 | |
7885e399 DG |
295 | /* If already enabled, everything is OK */ |
296 | if (uchan->enabled) { | |
297 | DBG3("Channel %s already enabled. Skipping", uchan->name); | |
f73fabfd | 298 | ret = LTTNG_ERR_UST_CHAN_EXIST; |
7885e399 | 299 | goto end; |
88e3c2f5 JG |
300 | } else { |
301 | uchan->enabled = 1; | |
302 | DBG2("Channel %s enabled successfully", uchan->name); | |
303 | } | |
304 | ||
305 | if (!usess->active) { | |
306 | /* | |
307 | * The channel will be activated against the apps | |
308 | * when the session is started as part of the | |
309 | * application channel "synchronize" operation. | |
310 | */ | |
311 | goto end; | |
7885e399 DG |
312 | } |
313 | ||
7972aab2 DG |
314 | DBG2("Channel %s being enabled in UST domain", uchan->name); |
315 | ||
316 | /* | |
317 | * Enable channel for UST global domain on all applications. Ignore return | |
318 | * value here since whatever error we got, it means that the channel was | |
319 | * not created on one or many registered applications and we can not report | |
320 | * this to the user yet. However, at this stage, the channel was | |
321 | * successfully created on the session daemon side so the enable-channel | |
322 | * command is a success. | |
323 | */ | |
d54b4440 | 324 | (void) ust_app_enable_channel_glb(usess, uchan); |
7885e399 | 325 | |
7885e399 DG |
326 | |
327 | end: | |
7885e399 DG |
328 | return ret; |
329 | } | |
330 | ||
331 | /* | |
332 | * Create UST channel for session and domain. | |
333 | */ | |
7972aab2 DG |
334 | int channel_ust_create(struct ltt_ust_session *usess, |
335 | struct lttng_channel *attr, enum lttng_buffer_type type) | |
7885e399 | 336 | { |
f73fabfd | 337 | int ret = LTTNG_OK; |
7885e399 DG |
338 | struct ltt_ust_channel *uchan = NULL; |
339 | struct lttng_channel *defattr = NULL; | |
b63d638b | 340 | enum lttng_domain_type domain = LTTNG_DOMAIN_UST; |
f86e086c | 341 | bool chan_published = false; |
7885e399 | 342 | |
a0377dfe | 343 | LTTNG_ASSERT(usess); |
0525e9ae | 344 | |
7885e399 DG |
345 | /* Creating channel attributes if needed */ |
346 | if (attr == NULL) { | |
0a9c6494 | 347 | defattr = channel_new_default_attr(LTTNG_DOMAIN_UST, type); |
7885e399 | 348 | if (defattr == NULL) { |
f73fabfd | 349 | ret = LTTNG_ERR_FATAL; |
7885e399 DG |
350 | goto error; |
351 | } | |
352 | attr = defattr; | |
b63d638b JG |
353 | } else { |
354 | /* | |
355 | * HACK: Set the channel's subdomain (JUL, Log4j, Python, etc.) | |
356 | * based on the default name. | |
357 | */ | |
358 | if (!strcmp(attr->name, DEFAULT_JUL_CHANNEL_NAME)) { | |
359 | domain = LTTNG_DOMAIN_JUL; | |
360 | } else if (!strcmp(attr->name, DEFAULT_LOG4J_CHANNEL_NAME)) { | |
361 | domain = LTTNG_DOMAIN_LOG4J; | |
362 | } else if (!strcmp(attr->name, DEFAULT_PYTHON_CHANNEL_NAME)) { | |
363 | domain = LTTNG_DOMAIN_PYTHON; | |
364 | } | |
7885e399 DG |
365 | } |
366 | ||
8d5841ea MD |
367 | /* |
368 | * Set the overwrite mode for this channel based on the session | |
369 | * type unless the client explicitly overrides the channel mode. | |
370 | */ | |
371 | if (attr->attr.overwrite == DEFAULT_CHANNEL_OVERWRITE) { | |
372 | attr->attr.overwrite = !!usess->snapshot_mode; | |
373 | } | |
374 | ||
375 | /* Enforce mmap output for snapshot sessions. */ | |
27babd3a | 376 | if (usess->snapshot_mode) { |
27babd3a DG |
377 | attr->attr.output = LTTNG_EVENT_MMAP; |
378 | } | |
379 | ||
da9d9d9c MD |
380 | /* Validate common channel properties. */ |
381 | if (channel_validate(attr) < 0) { | |
382 | ret = LTTNG_ERR_INVALID; | |
383 | goto error; | |
384 | } | |
385 | ||
b024d072 | 386 | /* |
0525e9ae DG |
387 | * Validate UST buffer size and number of buffers: must both be power of 2 |
388 | * and nonzero. We validate right here for UST, because applications will | |
389 | * not report the error to the user (unlike kernel tracing). | |
b024d072 | 390 | */ |
0525e9ae DG |
391 | if (!attr->attr.subbuf_size || |
392 | (attr->attr.subbuf_size & (attr->attr.subbuf_size - 1))) { | |
f73fabfd | 393 | ret = LTTNG_ERR_INVALID; |
b024d072 MD |
394 | goto error; |
395 | } | |
0525e9ae | 396 | |
12744796 DG |
397 | /* |
398 | * Invalid subbuffer size if it's lower then the page size. | |
399 | */ | |
412d7227 | 400 | if (attr->attr.subbuf_size < the_page_size) { |
12744796 DG |
401 | ret = LTTNG_ERR_INVALID; |
402 | goto error; | |
403 | } | |
404 | ||
0525e9ae DG |
405 | if (!attr->attr.num_subbuf || |
406 | (attr->attr.num_subbuf & (attr->attr.num_subbuf - 1))) { | |
f73fabfd | 407 | ret = LTTNG_ERR_INVALID; |
b024d072 MD |
408 | goto error; |
409 | } | |
410 | ||
a79d84dd DG |
411 | if (attr->attr.output != LTTNG_EVENT_MMAP) { |
412 | ret = LTTNG_ERR_NOT_SUPPORTED; | |
413 | goto error; | |
414 | } | |
415 | ||
1624d5b7 JD |
416 | /* |
417 | * The tracefile_size should not be < to the subbuf_size, otherwise | |
418 | * we won't be able to write the packets on disk | |
419 | */ | |
420 | if ((attr->attr.tracefile_size > 0) && | |
421 | (attr->attr.tracefile_size < attr->attr.subbuf_size)) { | |
422 | ret = LTTNG_ERR_INVALID; | |
423 | goto error; | |
424 | } | |
425 | ||
2e8269f7 DG |
426 | /* Validate buffer type. */ |
427 | switch (type) { | |
428 | case LTTNG_BUFFER_PER_PID: | |
0a9c6494 | 429 | break; |
2e8269f7 DG |
430 | case LTTNG_BUFFER_PER_UID: |
431 | break; | |
432 | default: | |
433 | ret = LTTNG_ERR_BUFFER_NOT_SUPPORTED; | |
434 | goto error; | |
435 | } | |
436 | ||
7885e399 | 437 | /* Create UST channel */ |
b63d638b | 438 | uchan = trace_ust_create_channel(attr, domain); |
7885e399 | 439 | if (uchan == NULL) { |
f73fabfd | 440 | ret = LTTNG_ERR_FATAL; |
7885e399 DG |
441 | goto error; |
442 | } | |
51755dc8 | 443 | |
58f3ca76 | 444 | uchan->enabled = 1; |
7972aab2 DG |
445 | if (trace_ust_is_max_id(usess->used_channel_id)) { |
446 | ret = LTTNG_ERR_UST_CHAN_FAIL; | |
447 | goto error; | |
448 | } | |
449 | uchan->id = trace_ust_get_next_chan_id(usess); | |
450 | ||
451 | DBG2("Channel %s is being created for UST with buffer %d and id %" PRIu64, | |
452 | uchan->name, type, uchan->id); | |
453 | ||
454 | /* Flag session buffer type. */ | |
455 | if (!usess->buffer_type_changed) { | |
456 | usess->buffer_type = type; | |
457 | usess->buffer_type_changed = 1; | |
458 | } else if (usess->buffer_type != type) { | |
459 | /* Buffer type was already set. Refuse to create channel. */ | |
460 | ret = LTTNG_ERR_BUFFER_TYPE_MISMATCH; | |
7885e399 DG |
461 | goto error_free_chan; |
462 | } | |
463 | ||
fc34caaa DG |
464 | /* Adding the channel to the channel hash table. */ |
465 | rcu_read_lock(); | |
ad7a9107 DG |
466 | if (strncmp(uchan->name, DEFAULT_METADATA_NAME, |
467 | sizeof(uchan->name))) { | |
468 | lttng_ht_add_unique_str(usess->domain_global.channels, &uchan->node); | |
f86e086c | 469 | chan_published = true; |
84ad93e8 DG |
470 | } else { |
471 | /* | |
472 | * Copy channel attribute to session if this is metadata so if NO | |
473 | * application exists we can access that data in the shadow copy during | |
474 | * the global update of newly registered application. | |
475 | */ | |
476 | memcpy(&usess->metadata_attr, &uchan->attr, | |
477 | sizeof(usess->metadata_attr)); | |
ad7a9107 | 478 | } |
fc34caaa DG |
479 | rcu_read_unlock(); |
480 | ||
7885e399 | 481 | DBG2("Channel %s created successfully", uchan->name); |
b63d638b JG |
482 | if (domain != LTTNG_DOMAIN_UST) { |
483 | struct agent *agt = trace_ust_find_agent(usess, domain); | |
484 | ||
485 | if (!agt) { | |
486 | agt = agent_create(domain); | |
487 | if (!agt) { | |
488 | ret = LTTNG_ERR_NOMEM; | |
f86e086c | 489 | goto error_remove_chan; |
b63d638b JG |
490 | } |
491 | agent_add(agt, usess->agents); | |
492 | } | |
493 | } | |
7885e399 | 494 | |
e9404c27 | 495 | channel_attr_destroy(defattr); |
f73fabfd | 496 | return LTTNG_OK; |
7885e399 | 497 | |
f86e086c MD |
498 | error_remove_chan: |
499 | if (chan_published) { | |
500 | trace_ust_delete_channel(usess->domain_global.channels, uchan); | |
501 | } | |
7885e399 DG |
502 | error_free_chan: |
503 | trace_ust_destroy_channel(uchan); | |
504 | error: | |
e9404c27 | 505 | channel_attr_destroy(defattr); |
7885e399 DG |
506 | return ret; |
507 | } | |
508 | ||
509 | /* | |
510 | * Disable UST channel for session and domain. | |
511 | */ | |
7972aab2 | 512 | int channel_ust_disable(struct ltt_ust_session *usess, |
7885e399 DG |
513 | struct ltt_ust_channel *uchan) |
514 | { | |
f73fabfd | 515 | int ret = LTTNG_OK; |
7885e399 | 516 | |
a0377dfe FD |
517 | LTTNG_ASSERT(usess); |
518 | LTTNG_ASSERT(uchan); | |
0525e9ae | 519 | |
7885e399 DG |
520 | /* Already disabled */ |
521 | if (uchan->enabled == 0) { | |
522 | DBG2("Channel UST %s already disabled", uchan->name); | |
523 | goto end; | |
524 | } | |
fbee8987 FD |
525 | |
526 | uchan->enabled = 0; | |
527 | ||
528 | /* | |
529 | * If session is inactive we don't notify the tracer right away. We | |
530 | * wait for the next synchronization. | |
531 | */ | |
88e3c2f5 JG |
532 | if (!usess->active) { |
533 | goto end; | |
534 | } | |
7885e399 | 535 | |
7972aab2 DG |
536 | DBG2("Channel %s being disabled in UST global domain", uchan->name); |
537 | /* Disable channel for global domain */ | |
538 | ret = ust_app_disable_channel_glb(usess, uchan); | |
49c336c1 | 539 | if (ret < 0 && ret != -LTTNG_UST_ERR_EXIST) { |
f73fabfd | 540 | ret = LTTNG_ERR_UST_CHAN_DISABLE_FAIL; |
7885e399 DG |
541 | goto error; |
542 | } | |
543 | ||
7885e399 DG |
544 | DBG2("Channel %s disabled successfully", uchan->name); |
545 | ||
f73fabfd | 546 | return LTTNG_OK; |
7885e399 DG |
547 | |
548 | end: | |
549 | error: | |
550 | return ret; | |
551 | } |