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; |
491d1539 | 75 | extended_attr->blocking_timeout = DEFAULT_KERNEL_CHANNEL_BLOCKING_TIMEOUT; |
e9404c27 JG |
76 | extended_attr->monitor_timer_interval = |
77 | DEFAULT_KERNEL_CHANNEL_MONITOR_TIMER; | |
1b1c65fa | 78 | break; |
bdf64013 JG |
79 | case LTTNG_DOMAIN_JUL: |
80 | channel_name = DEFAULT_JUL_CHANNEL_NAME; | |
81 | goto common_ust; | |
82 | case LTTNG_DOMAIN_LOG4J: | |
83 | channel_name = DEFAULT_LOG4J_CHANNEL_NAME; | |
84 | goto common_ust; | |
85 | case LTTNG_DOMAIN_PYTHON: | |
86 | channel_name = DEFAULT_PYTHON_CHANNEL_NAME; | |
87 | goto common_ust; | |
1b1c65fa | 88 | case LTTNG_DOMAIN_UST: |
bdf64013 | 89 | common_ust: |
0a9c6494 DG |
90 | switch (type) { |
91 | case LTTNG_BUFFER_PER_UID: | |
92 | chan->attr.subbuf_size = default_get_ust_uid_channel_subbuf_size(); | |
93 | chan->attr.num_subbuf = DEFAULT_UST_UID_CHANNEL_SUBBUF_NUM; | |
94 | chan->attr.output = DEFAULT_UST_UID_CHANNEL_OUTPUT; | |
95 | chan->attr.switch_timer_interval = | |
96 | DEFAULT_UST_UID_CHANNEL_SWITCH_TIMER; | |
97 | chan->attr.read_timer_interval = | |
98 | DEFAULT_UST_UID_CHANNEL_READ_TIMER; | |
ecc48a90 JD |
99 | chan->attr.live_timer_interval = |
100 | DEFAULT_UST_UID_CHANNEL_LIVE_TIMER; | |
491d1539 | 101 | extended_attr->blocking_timeout = DEFAULT_UST_UID_CHANNEL_BLOCKING_TIMEOUT; |
e9404c27 JG |
102 | extended_attr->monitor_timer_interval = |
103 | DEFAULT_UST_UID_CHANNEL_MONITOR_TIMER; | |
0a9c6494 DG |
104 | break; |
105 | case LTTNG_BUFFER_PER_PID: | |
106 | default: | |
107 | chan->attr.subbuf_size = default_get_ust_pid_channel_subbuf_size(); | |
108 | chan->attr.num_subbuf = DEFAULT_UST_PID_CHANNEL_SUBBUF_NUM; | |
109 | chan->attr.output = DEFAULT_UST_PID_CHANNEL_OUTPUT; | |
110 | chan->attr.switch_timer_interval = | |
111 | DEFAULT_UST_PID_CHANNEL_SWITCH_TIMER; | |
112 | chan->attr.read_timer_interval = | |
113 | DEFAULT_UST_PID_CHANNEL_READ_TIMER; | |
ecc48a90 | 114 | chan->attr.live_timer_interval = |
e9404c27 | 115 | DEFAULT_UST_PID_CHANNEL_LIVE_TIMER; |
491d1539 | 116 | extended_attr->blocking_timeout = DEFAULT_UST_PID_CHANNEL_BLOCKING_TIMEOUT; |
e9404c27 JG |
117 | extended_attr->monitor_timer_interval = |
118 | DEFAULT_UST_PID_CHANNEL_MONITOR_TIMER; | |
0a9c6494 DG |
119 | break; |
120 | } | |
1b1c65fa MD |
121 | break; |
122 | default: | |
123 | goto error; /* Not implemented */ | |
54d01ffb DG |
124 | } |
125 | ||
bdf64013 JG |
126 | if (snprintf(chan->name, sizeof(chan->name), "%s", |
127 | channel_name) < 0) { | |
128 | PERROR("snprintf default channel name"); | |
129 | goto error; | |
130 | } | |
54d01ffb DG |
131 | return chan; |
132 | ||
133 | error: | |
e9404c27 | 134 | free(extended_attr); |
54d01ffb DG |
135 | free(chan); |
136 | error_alloc: | |
137 | return NULL; | |
138 | } | |
139 | ||
e9404c27 JG |
140 | void channel_attr_destroy(struct lttng_channel *channel) |
141 | { | |
142 | if (!channel) { | |
143 | return; | |
144 | } | |
145 | free(channel->attr.extended.ptr); | |
146 | free(channel); | |
147 | } | |
148 | ||
54d01ffb DG |
149 | /* |
150 | * Disable kernel channel of the kernel session. | |
151 | */ | |
152 | int channel_kernel_disable(struct ltt_kernel_session *ksession, | |
153 | char *channel_name) | |
154 | { | |
155 | int ret; | |
156 | struct ltt_kernel_channel *kchan; | |
157 | ||
0525e9ae DG |
158 | assert(ksession); |
159 | assert(channel_name); | |
160 | ||
54d01ffb DG |
161 | kchan = trace_kernel_get_channel_by_name(channel_name, ksession); |
162 | if (kchan == NULL) { | |
f73fabfd | 163 | ret = LTTNG_ERR_KERN_CHAN_NOT_FOUND; |
54d01ffb | 164 | goto error; |
0525e9ae DG |
165 | } |
166 | ||
167 | /* Only if channel is enabled disable it. */ | |
168 | if (kchan->enabled == 1) { | |
54d01ffb | 169 | ret = kernel_disable_channel(kchan); |
7885e399 | 170 | if (ret < 0 && ret != -EEXIST) { |
f73fabfd | 171 | ret = LTTNG_ERR_KERN_CHAN_DISABLE_FAIL; |
54d01ffb DG |
172 | goto error; |
173 | } | |
174 | } | |
175 | ||
f73fabfd | 176 | ret = LTTNG_OK; |
54d01ffb DG |
177 | |
178 | error: | |
179 | return ret; | |
180 | } | |
181 | ||
182 | /* | |
183 | * Enable kernel channel of the kernel session. | |
184 | */ | |
185 | int channel_kernel_enable(struct ltt_kernel_session *ksession, | |
186 | struct ltt_kernel_channel *kchan) | |
187 | { | |
188 | int ret; | |
189 | ||
0525e9ae DG |
190 | assert(ksession); |
191 | assert(kchan); | |
192 | ||
54d01ffb DG |
193 | if (kchan->enabled == 0) { |
194 | ret = kernel_enable_channel(kchan); | |
195 | if (ret < 0) { | |
f73fabfd | 196 | ret = LTTNG_ERR_KERN_CHAN_ENABLE_FAIL; |
54d01ffb DG |
197 | goto error; |
198 | } | |
42224349 | 199 | } else { |
f73fabfd | 200 | ret = LTTNG_ERR_KERN_CHAN_EXIST; |
42224349 | 201 | goto error; |
54d01ffb DG |
202 | } |
203 | ||
f73fabfd | 204 | ret = LTTNG_OK; |
54d01ffb DG |
205 | |
206 | error: | |
207 | return ret; | |
208 | } | |
209 | ||
da9d9d9c MD |
210 | static int channel_validate(struct lttng_channel *attr) |
211 | { | |
212 | /* | |
213 | * The ringbuffer (both in user space and kernel) behaves badly | |
214 | * in overwrite mode and with less than 2 subbuffers so block it | |
215 | * right away and send back an invalid attribute error. | |
216 | */ | |
217 | if (attr->attr.overwrite && attr->attr.num_subbuf < 2) { | |
218 | return -1; | |
219 | } | |
220 | return 0; | |
221 | } | |
222 | ||
491d1539 MD |
223 | static int channel_validate_kernel(struct lttng_channel *attr) |
224 | { | |
225 | /* Kernel channels do not support blocking timeout. */ | |
226 | if (((struct lttng_channel_extended *)attr->attr.extended.ptr)->blocking_timeout) { | |
227 | return -1; | |
228 | } | |
229 | return 0; | |
230 | } | |
231 | ||
54d01ffb DG |
232 | /* |
233 | * Create kernel channel of the kernel session and notify kernel thread. | |
234 | */ | |
235 | int channel_kernel_create(struct ltt_kernel_session *ksession, | |
ff4d74e6 | 236 | struct lttng_channel *attr, int kernel_pipe) |
54d01ffb DG |
237 | { |
238 | int ret; | |
ff4d74e6 | 239 | struct lttng_channel *defattr = NULL; |
54d01ffb | 240 | |
0525e9ae DG |
241 | assert(ksession); |
242 | ||
54d01ffb DG |
243 | /* Creating channel attributes if needed */ |
244 | if (attr == NULL) { | |
0a9c6494 DG |
245 | defattr = channel_new_default_attr(LTTNG_DOMAIN_KERNEL, |
246 | LTTNG_BUFFER_GLOBAL); | |
ff4d74e6 | 247 | if (defattr == NULL) { |
f73fabfd | 248 | ret = LTTNG_ERR_FATAL; |
54d01ffb DG |
249 | goto error; |
250 | } | |
ff4d74e6 | 251 | attr = defattr; |
54d01ffb DG |
252 | } |
253 | ||
8d5841ea MD |
254 | /* |
255 | * Set the overwrite mode for this channel based on the session | |
256 | * type unless the client explicitly overrides the channel mode. | |
257 | */ | |
258 | if (attr->attr.overwrite == DEFAULT_CHANNEL_OVERWRITE) { | |
259 | attr->attr.overwrite = !!ksession->snapshot_mode; | |
260 | } | |
261 | ||
da9d9d9c MD |
262 | /* Validate common channel properties. */ |
263 | if (channel_validate(attr) < 0) { | |
264 | ret = LTTNG_ERR_INVALID; | |
265 | goto error; | |
266 | } | |
267 | ||
491d1539 MD |
268 | if (channel_validate_kernel(attr) < 0) { |
269 | ret = LTTNG_ERR_INVALID; | |
270 | goto error; | |
271 | } | |
272 | ||
54d01ffb | 273 | /* Channel not found, creating it */ |
fdd9eb17 | 274 | ret = kernel_create_channel(ksession, attr); |
54d01ffb | 275 | if (ret < 0) { |
f73fabfd | 276 | ret = LTTNG_ERR_KERN_CHAN_FAIL; |
54d01ffb DG |
277 | goto error; |
278 | } | |
279 | ||
280 | /* Notify kernel thread that there is a new channel */ | |
281 | ret = notify_thread_pipe(kernel_pipe); | |
282 | if (ret < 0) { | |
f73fabfd | 283 | ret = LTTNG_ERR_FATAL; |
54d01ffb DG |
284 | goto error; |
285 | } | |
286 | ||
f73fabfd | 287 | ret = LTTNG_OK; |
54d01ffb | 288 | error: |
e9404c27 | 289 | channel_attr_destroy(defattr); |
54d01ffb DG |
290 | return ret; |
291 | } | |
7885e399 DG |
292 | |
293 | /* | |
294 | * Enable UST channel for session and domain. | |
295 | */ | |
7972aab2 | 296 | int channel_ust_enable(struct ltt_ust_session *usess, |
7885e399 DG |
297 | struct ltt_ust_channel *uchan) |
298 | { | |
f73fabfd | 299 | int ret = LTTNG_OK; |
7885e399 | 300 | |
0525e9ae DG |
301 | assert(usess); |
302 | assert(uchan); | |
303 | ||
7885e399 DG |
304 | /* If already enabled, everything is OK */ |
305 | if (uchan->enabled) { | |
306 | DBG3("Channel %s already enabled. Skipping", uchan->name); | |
f73fabfd | 307 | ret = LTTNG_ERR_UST_CHAN_EXIST; |
7885e399 | 308 | goto end; |
88e3c2f5 JG |
309 | } else { |
310 | uchan->enabled = 1; | |
311 | DBG2("Channel %s enabled successfully", uchan->name); | |
312 | } | |
313 | ||
314 | if (!usess->active) { | |
315 | /* | |
316 | * The channel will be activated against the apps | |
317 | * when the session is started as part of the | |
318 | * application channel "synchronize" operation. | |
319 | */ | |
320 | goto end; | |
7885e399 DG |
321 | } |
322 | ||
7972aab2 DG |
323 | DBG2("Channel %s being enabled in UST domain", uchan->name); |
324 | ||
325 | /* | |
326 | * Enable channel for UST global domain on all applications. Ignore return | |
327 | * value here since whatever error we got, it means that the channel was | |
328 | * not created on one or many registered applications and we can not report | |
329 | * this to the user yet. However, at this stage, the channel was | |
330 | * successfully created on the session daemon side so the enable-channel | |
331 | * command is a success. | |
332 | */ | |
d54b4440 | 333 | (void) ust_app_enable_channel_glb(usess, uchan); |
7885e399 | 334 | |
7885e399 DG |
335 | |
336 | end: | |
7885e399 DG |
337 | return ret; |
338 | } | |
339 | ||
340 | /* | |
341 | * Create UST channel for session and domain. | |
342 | */ | |
7972aab2 DG |
343 | int channel_ust_create(struct ltt_ust_session *usess, |
344 | struct lttng_channel *attr, enum lttng_buffer_type type) | |
7885e399 | 345 | { |
f73fabfd | 346 | int ret = LTTNG_OK; |
7885e399 DG |
347 | struct ltt_ust_channel *uchan = NULL; |
348 | struct lttng_channel *defattr = NULL; | |
b63d638b | 349 | enum lttng_domain_type domain = LTTNG_DOMAIN_UST; |
f86e086c | 350 | bool chan_published = false; |
7885e399 | 351 | |
0525e9ae DG |
352 | assert(usess); |
353 | ||
7885e399 DG |
354 | /* Creating channel attributes if needed */ |
355 | if (attr == NULL) { | |
0a9c6494 | 356 | defattr = channel_new_default_attr(LTTNG_DOMAIN_UST, type); |
7885e399 | 357 | if (defattr == NULL) { |
f73fabfd | 358 | ret = LTTNG_ERR_FATAL; |
7885e399 DG |
359 | goto error; |
360 | } | |
361 | attr = defattr; | |
b63d638b JG |
362 | } else { |
363 | /* | |
364 | * HACK: Set the channel's subdomain (JUL, Log4j, Python, etc.) | |
365 | * based on the default name. | |
366 | */ | |
367 | if (!strcmp(attr->name, DEFAULT_JUL_CHANNEL_NAME)) { | |
368 | domain = LTTNG_DOMAIN_JUL; | |
369 | } else if (!strcmp(attr->name, DEFAULT_LOG4J_CHANNEL_NAME)) { | |
370 | domain = LTTNG_DOMAIN_LOG4J; | |
371 | } else if (!strcmp(attr->name, DEFAULT_PYTHON_CHANNEL_NAME)) { | |
372 | domain = LTTNG_DOMAIN_PYTHON; | |
373 | } | |
7885e399 DG |
374 | } |
375 | ||
8d5841ea MD |
376 | /* |
377 | * Set the overwrite mode for this channel based on the session | |
378 | * type unless the client explicitly overrides the channel mode. | |
379 | */ | |
380 | if (attr->attr.overwrite == DEFAULT_CHANNEL_OVERWRITE) { | |
381 | attr->attr.overwrite = !!usess->snapshot_mode; | |
382 | } | |
383 | ||
384 | /* Enforce mmap output for snapshot sessions. */ | |
27babd3a | 385 | if (usess->snapshot_mode) { |
27babd3a DG |
386 | attr->attr.output = LTTNG_EVENT_MMAP; |
387 | } | |
388 | ||
da9d9d9c MD |
389 | /* Validate common channel properties. */ |
390 | if (channel_validate(attr) < 0) { | |
391 | ret = LTTNG_ERR_INVALID; | |
392 | goto error; | |
393 | } | |
394 | ||
b024d072 | 395 | /* |
0525e9ae DG |
396 | * Validate UST buffer size and number of buffers: must both be power of 2 |
397 | * and nonzero. We validate right here for UST, because applications will | |
398 | * not report the error to the user (unlike kernel tracing). | |
b024d072 | 399 | */ |
0525e9ae DG |
400 | if (!attr->attr.subbuf_size || |
401 | (attr->attr.subbuf_size & (attr->attr.subbuf_size - 1))) { | |
f73fabfd | 402 | ret = LTTNG_ERR_INVALID; |
b024d072 MD |
403 | goto error; |
404 | } | |
0525e9ae | 405 | |
12744796 DG |
406 | /* |
407 | * Invalid subbuffer size if it's lower then the page size. | |
408 | */ | |
409 | if (attr->attr.subbuf_size < page_size) { | |
410 | ret = LTTNG_ERR_INVALID; | |
411 | goto error; | |
412 | } | |
413 | ||
0525e9ae DG |
414 | if (!attr->attr.num_subbuf || |
415 | (attr->attr.num_subbuf & (attr->attr.num_subbuf - 1))) { | |
f73fabfd | 416 | ret = LTTNG_ERR_INVALID; |
b024d072 MD |
417 | goto error; |
418 | } | |
419 | ||
a79d84dd DG |
420 | if (attr->attr.output != LTTNG_EVENT_MMAP) { |
421 | ret = LTTNG_ERR_NOT_SUPPORTED; | |
422 | goto error; | |
423 | } | |
424 | ||
1624d5b7 JD |
425 | /* |
426 | * The tracefile_size should not be < to the subbuf_size, otherwise | |
427 | * we won't be able to write the packets on disk | |
428 | */ | |
429 | if ((attr->attr.tracefile_size > 0) && | |
430 | (attr->attr.tracefile_size < attr->attr.subbuf_size)) { | |
431 | ret = LTTNG_ERR_INVALID; | |
432 | goto error; | |
433 | } | |
434 | ||
2e8269f7 DG |
435 | /* Validate buffer type. */ |
436 | switch (type) { | |
437 | case LTTNG_BUFFER_PER_PID: | |
0a9c6494 | 438 | break; |
2e8269f7 DG |
439 | case LTTNG_BUFFER_PER_UID: |
440 | break; | |
441 | default: | |
442 | ret = LTTNG_ERR_BUFFER_NOT_SUPPORTED; | |
443 | goto error; | |
444 | } | |
445 | ||
7885e399 | 446 | /* Create UST channel */ |
b63d638b | 447 | uchan = trace_ust_create_channel(attr, domain); |
7885e399 | 448 | if (uchan == NULL) { |
f73fabfd | 449 | ret = LTTNG_ERR_FATAL; |
7885e399 DG |
450 | goto error; |
451 | } | |
51755dc8 | 452 | |
58f3ca76 | 453 | uchan->enabled = 1; |
7972aab2 DG |
454 | if (trace_ust_is_max_id(usess->used_channel_id)) { |
455 | ret = LTTNG_ERR_UST_CHAN_FAIL; | |
456 | goto error; | |
457 | } | |
458 | uchan->id = trace_ust_get_next_chan_id(usess); | |
459 | ||
460 | DBG2("Channel %s is being created for UST with buffer %d and id %" PRIu64, | |
461 | uchan->name, type, uchan->id); | |
462 | ||
463 | /* Flag session buffer type. */ | |
464 | if (!usess->buffer_type_changed) { | |
465 | usess->buffer_type = type; | |
466 | usess->buffer_type_changed = 1; | |
467 | } else if (usess->buffer_type != type) { | |
468 | /* Buffer type was already set. Refuse to create channel. */ | |
469 | ret = LTTNG_ERR_BUFFER_TYPE_MISMATCH; | |
7885e399 DG |
470 | goto error_free_chan; |
471 | } | |
472 | ||
88e3c2f5 JG |
473 | if (usess->active) { |
474 | /* Enable channel for global domain */ | |
475 | ret = ust_app_create_channel_glb(usess, uchan); | |
476 | if (ret < 0 && ret != -LTTNG_UST_ERR_EXIST) { | |
477 | ret = LTTNG_ERR_UST_CHAN_FAIL; | |
478 | goto error_free_chan; | |
479 | } | |
7885e399 DG |
480 | } |
481 | ||
fc34caaa DG |
482 | /* Adding the channel to the channel hash table. */ |
483 | rcu_read_lock(); | |
ad7a9107 DG |
484 | if (strncmp(uchan->name, DEFAULT_METADATA_NAME, |
485 | sizeof(uchan->name))) { | |
486 | lttng_ht_add_unique_str(usess->domain_global.channels, &uchan->node); | |
f86e086c | 487 | chan_published = true; |
84ad93e8 DG |
488 | } else { |
489 | /* | |
490 | * Copy channel attribute to session if this is metadata so if NO | |
491 | * application exists we can access that data in the shadow copy during | |
492 | * the global update of newly registered application. | |
493 | */ | |
494 | memcpy(&usess->metadata_attr, &uchan->attr, | |
495 | sizeof(usess->metadata_attr)); | |
ad7a9107 | 496 | } |
fc34caaa DG |
497 | rcu_read_unlock(); |
498 | ||
7885e399 | 499 | DBG2("Channel %s created successfully", uchan->name); |
b63d638b JG |
500 | if (domain != LTTNG_DOMAIN_UST) { |
501 | struct agent *agt = trace_ust_find_agent(usess, domain); | |
502 | ||
503 | if (!agt) { | |
504 | agt = agent_create(domain); | |
505 | if (!agt) { | |
506 | ret = LTTNG_ERR_NOMEM; | |
f86e086c | 507 | goto error_remove_chan; |
b63d638b JG |
508 | } |
509 | agent_add(agt, usess->agents); | |
510 | } | |
511 | } | |
7885e399 | 512 | |
e9404c27 | 513 | channel_attr_destroy(defattr); |
f73fabfd | 514 | return LTTNG_OK; |
7885e399 | 515 | |
f86e086c MD |
516 | error_remove_chan: |
517 | if (chan_published) { | |
518 | trace_ust_delete_channel(usess->domain_global.channels, uchan); | |
519 | } | |
7885e399 DG |
520 | error_free_chan: |
521 | trace_ust_destroy_channel(uchan); | |
522 | error: | |
e9404c27 | 523 | channel_attr_destroy(defattr); |
7885e399 DG |
524 | return ret; |
525 | } | |
526 | ||
527 | /* | |
528 | * Disable UST channel for session and domain. | |
529 | */ | |
7972aab2 | 530 | int channel_ust_disable(struct ltt_ust_session *usess, |
7885e399 DG |
531 | struct ltt_ust_channel *uchan) |
532 | { | |
f73fabfd | 533 | int ret = LTTNG_OK; |
7885e399 | 534 | |
0525e9ae DG |
535 | assert(usess); |
536 | assert(uchan); | |
537 | ||
7885e399 DG |
538 | /* Already disabled */ |
539 | if (uchan->enabled == 0) { | |
540 | DBG2("Channel UST %s already disabled", uchan->name); | |
541 | goto end; | |
542 | } | |
88e3c2f5 JG |
543 | if (!usess->active) { |
544 | goto end; | |
545 | } | |
7885e399 | 546 | |
7972aab2 DG |
547 | DBG2("Channel %s being disabled in UST global domain", uchan->name); |
548 | /* Disable channel for global domain */ | |
549 | ret = ust_app_disable_channel_glb(usess, uchan); | |
49c336c1 | 550 | if (ret < 0 && ret != -LTTNG_UST_ERR_EXIST) { |
f73fabfd | 551 | ret = LTTNG_ERR_UST_CHAN_DISABLE_FAIL; |
7885e399 DG |
552 | goto error; |
553 | } | |
554 | ||
555 | uchan->enabled = 0; | |
556 | ||
557 | DBG2("Channel %s disabled successfully", uchan->name); | |
558 | ||
f73fabfd | 559 | return LTTNG_OK; |
7885e399 DG |
560 | |
561 | end: | |
562 | error: | |
563 | return ret; | |
564 | } |