Tests: remove flaky '*' kernel wildcard test
[lttng-tools.git] / src / bin / lttng-sessiond / channel.c
CommitLineData
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
39struct 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;
54d01ffb
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44
45 chan = zmalloc(sizeof(struct lttng_channel));
46 if (chan == NULL) {
7885e399 47 PERROR("zmalloc channel init");
54d01ffb
DG
48 goto error_alloc;
49 }
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:
0a9c6494 58 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;
1b1c65fa 66 break;
bdf64013
JG
67 case LTTNG_DOMAIN_JUL:
68 channel_name = DEFAULT_JUL_CHANNEL_NAME;
69 goto common_ust;
70 case LTTNG_DOMAIN_LOG4J:
71 channel_name = DEFAULT_LOG4J_CHANNEL_NAME;
72 goto common_ust;
73 case LTTNG_DOMAIN_PYTHON:
74 channel_name = DEFAULT_PYTHON_CHANNEL_NAME;
75 goto common_ust;
1b1c65fa 76 case LTTNG_DOMAIN_UST:
bdf64013 77common_ust:
0a9c6494
DG
78 switch (type) {
79 case LTTNG_BUFFER_PER_UID:
80 chan->attr.subbuf_size = default_get_ust_uid_channel_subbuf_size();
81 chan->attr.num_subbuf = DEFAULT_UST_UID_CHANNEL_SUBBUF_NUM;
82 chan->attr.output = DEFAULT_UST_UID_CHANNEL_OUTPUT;
83 chan->attr.switch_timer_interval =
84 DEFAULT_UST_UID_CHANNEL_SWITCH_TIMER;
85 chan->attr.read_timer_interval =
86 DEFAULT_UST_UID_CHANNEL_READ_TIMER;
ecc48a90
JD
87 chan->attr.live_timer_interval =
88 DEFAULT_UST_UID_CHANNEL_LIVE_TIMER;
0a9c6494
DG
89 break;
90 case LTTNG_BUFFER_PER_PID:
91 default:
92 chan->attr.subbuf_size = default_get_ust_pid_channel_subbuf_size();
93 chan->attr.num_subbuf = DEFAULT_UST_PID_CHANNEL_SUBBUF_NUM;
94 chan->attr.output = DEFAULT_UST_PID_CHANNEL_OUTPUT;
95 chan->attr.switch_timer_interval =
96 DEFAULT_UST_PID_CHANNEL_SWITCH_TIMER;
97 chan->attr.read_timer_interval =
98 DEFAULT_UST_PID_CHANNEL_READ_TIMER;
ecc48a90
JD
99 chan->attr.live_timer_interval =
100 DEFAULT_UST_UID_CHANNEL_LIVE_TIMER;
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DG
101 break;
102 }
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MD
103 break;
104 default:
105 goto error; /* Not implemented */
54d01ffb
DG
106 }
107
bdf64013
JG
108 if (snprintf(chan->name, sizeof(chan->name), "%s",
109 channel_name) < 0) {
110 PERROR("snprintf default channel name");
111 goto error;
112 }
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113 return chan;
114
115error:
116 free(chan);
117error_alloc:
118 return NULL;
119}
120
121/*
122 * Disable kernel channel of the kernel session.
123 */
124int channel_kernel_disable(struct ltt_kernel_session *ksession,
125 char *channel_name)
126{
127 int ret;
128 struct ltt_kernel_channel *kchan;
129
0525e9ae
DG
130 assert(ksession);
131 assert(channel_name);
132
54d01ffb
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133 kchan = trace_kernel_get_channel_by_name(channel_name, ksession);
134 if (kchan == NULL) {
f73fabfd 135 ret = LTTNG_ERR_KERN_CHAN_NOT_FOUND;
54d01ffb 136 goto error;
0525e9ae
DG
137 }
138
139 /* Only if channel is enabled disable it. */
140 if (kchan->enabled == 1) {
54d01ffb 141 ret = kernel_disable_channel(kchan);
7885e399 142 if (ret < 0 && ret != -EEXIST) {
f73fabfd 143 ret = LTTNG_ERR_KERN_CHAN_DISABLE_FAIL;
54d01ffb
DG
144 goto error;
145 }
146 }
147
f73fabfd 148 ret = LTTNG_OK;
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149
150error:
151 return ret;
152}
153
154/*
155 * Enable kernel channel of the kernel session.
156 */
157int channel_kernel_enable(struct ltt_kernel_session *ksession,
158 struct ltt_kernel_channel *kchan)
159{
160 int ret;
161
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162 assert(ksession);
163 assert(kchan);
164
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165 if (kchan->enabled == 0) {
166 ret = kernel_enable_channel(kchan);
167 if (ret < 0) {
f73fabfd 168 ret = LTTNG_ERR_KERN_CHAN_ENABLE_FAIL;
54d01ffb
DG
169 goto error;
170 }
42224349 171 } else {
f73fabfd 172 ret = LTTNG_ERR_KERN_CHAN_EXIST;
42224349 173 goto error;
54d01ffb
DG
174 }
175
f73fabfd 176 ret = LTTNG_OK;
54d01ffb
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177
178error:
179 return ret;
180}
181
182/*
183 * Create kernel channel of the kernel session and notify kernel thread.
184 */
185int channel_kernel_create(struct ltt_kernel_session *ksession,
ff4d74e6 186 struct lttng_channel *attr, int kernel_pipe)
54d01ffb
DG
187{
188 int ret;
ff4d74e6 189 struct lttng_channel *defattr = NULL;
54d01ffb 190
0525e9ae
DG
191 assert(ksession);
192
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193 /* Creating channel attributes if needed */
194 if (attr == NULL) {
0a9c6494
DG
195 defattr = channel_new_default_attr(LTTNG_DOMAIN_KERNEL,
196 LTTNG_BUFFER_GLOBAL);
ff4d74e6 197 if (defattr == NULL) {
f73fabfd 198 ret = LTTNG_ERR_FATAL;
54d01ffb
DG
199 goto error;
200 }
ff4d74e6 201 attr = defattr;
54d01ffb
DG
202 }
203
27babd3a
DG
204 if (ksession->snapshot_mode) {
205 /* Force channel attribute for snapshot mode. */
206 attr->attr.overwrite = 1;
207 attr->attr.output = LTTNG_EVENT_MMAP;
208 }
209
54d01ffb 210 /* Channel not found, creating it */
fdd9eb17 211 ret = kernel_create_channel(ksession, attr);
54d01ffb 212 if (ret < 0) {
f73fabfd 213 ret = LTTNG_ERR_KERN_CHAN_FAIL;
54d01ffb
DG
214 goto error;
215 }
216
217 /* Notify kernel thread that there is a new channel */
218 ret = notify_thread_pipe(kernel_pipe);
219 if (ret < 0) {
f73fabfd 220 ret = LTTNG_ERR_FATAL;
54d01ffb
DG
221 goto error;
222 }
223
f73fabfd 224 ret = LTTNG_OK;
54d01ffb 225error:
ff4d74e6 226 free(defattr);
54d01ffb
DG
227 return ret;
228}
7885e399
DG
229
230/*
231 * Enable UST channel for session and domain.
232 */
7972aab2 233int channel_ust_enable(struct ltt_ust_session *usess,
7885e399
DG
234 struct ltt_ust_channel *uchan)
235{
f73fabfd 236 int ret = LTTNG_OK;
7885e399 237
0525e9ae
DG
238 assert(usess);
239 assert(uchan);
240
7885e399
DG
241 /* If already enabled, everything is OK */
242 if (uchan->enabled) {
243 DBG3("Channel %s already enabled. Skipping", uchan->name);
f73fabfd 244 ret = LTTNG_ERR_UST_CHAN_EXIST;
7885e399
DG
245 goto end;
246 }
247
7972aab2
DG
248 DBG2("Channel %s being enabled in UST domain", uchan->name);
249
250 /*
251 * Enable channel for UST global domain on all applications. Ignore return
252 * value here since whatever error we got, it means that the channel was
253 * not created on one or many registered applications and we can not report
254 * this to the user yet. However, at this stage, the channel was
255 * successfully created on the session daemon side so the enable-channel
256 * command is a success.
257 */
d54b4440 258 (void) ust_app_enable_channel_glb(usess, uchan);
7885e399 259
7885e399
DG
260 uchan->enabled = 1;
261 DBG2("Channel %s enabled successfully", uchan->name);
262
263end:
7885e399
DG
264 return ret;
265}
266
267/*
268 * Create UST channel for session and domain.
269 */
7972aab2
DG
270int channel_ust_create(struct ltt_ust_session *usess,
271 struct lttng_channel *attr, enum lttng_buffer_type type)
7885e399 272{
f73fabfd 273 int ret = LTTNG_OK;
7885e399
DG
274 struct ltt_ust_channel *uchan = NULL;
275 struct lttng_channel *defattr = NULL;
b63d638b 276 enum lttng_domain_type domain = LTTNG_DOMAIN_UST;
7885e399 277
0525e9ae
DG
278 assert(usess);
279
7885e399
DG
280 /* Creating channel attributes if needed */
281 if (attr == NULL) {
0a9c6494 282 defattr = channel_new_default_attr(LTTNG_DOMAIN_UST, type);
7885e399 283 if (defattr == NULL) {
f73fabfd 284 ret = LTTNG_ERR_FATAL;
7885e399
DG
285 goto error;
286 }
287 attr = defattr;
b63d638b
JG
288 } else {
289 /*
290 * HACK: Set the channel's subdomain (JUL, Log4j, Python, etc.)
291 * based on the default name.
292 */
293 if (!strcmp(attr->name, DEFAULT_JUL_CHANNEL_NAME)) {
294 domain = LTTNG_DOMAIN_JUL;
295 } else if (!strcmp(attr->name, DEFAULT_LOG4J_CHANNEL_NAME)) {
296 domain = LTTNG_DOMAIN_LOG4J;
297 } else if (!strcmp(attr->name, DEFAULT_PYTHON_CHANNEL_NAME)) {
298 domain = LTTNG_DOMAIN_PYTHON;
299 }
7885e399
DG
300 }
301
27babd3a
DG
302 if (usess->snapshot_mode) {
303 /* Force channel attribute for snapshot mode. */
304 attr->attr.overwrite = 1;
305 attr->attr.output = LTTNG_EVENT_MMAP;
306 }
307
b024d072 308 /*
0525e9ae
DG
309 * Validate UST buffer size and number of buffers: must both be power of 2
310 * and nonzero. We validate right here for UST, because applications will
311 * not report the error to the user (unlike kernel tracing).
b024d072 312 */
0525e9ae
DG
313 if (!attr->attr.subbuf_size ||
314 (attr->attr.subbuf_size & (attr->attr.subbuf_size - 1))) {
f73fabfd 315 ret = LTTNG_ERR_INVALID;
b024d072
MD
316 goto error;
317 }
0525e9ae 318
12744796
DG
319 /*
320 * Invalid subbuffer size if it's lower then the page size.
321 */
322 if (attr->attr.subbuf_size < page_size) {
323 ret = LTTNG_ERR_INVALID;
324 goto error;
325 }
326
0525e9ae
DG
327 if (!attr->attr.num_subbuf ||
328 (attr->attr.num_subbuf & (attr->attr.num_subbuf - 1))) {
f73fabfd 329 ret = LTTNG_ERR_INVALID;
b024d072
MD
330 goto error;
331 }
332
a79d84dd
DG
333 if (attr->attr.output != LTTNG_EVENT_MMAP) {
334 ret = LTTNG_ERR_NOT_SUPPORTED;
335 goto error;
336 }
337
1624d5b7
JD
338 /*
339 * The tracefile_size should not be < to the subbuf_size, otherwise
340 * we won't be able to write the packets on disk
341 */
342 if ((attr->attr.tracefile_size > 0) &&
343 (attr->attr.tracefile_size < attr->attr.subbuf_size)) {
344 ret = LTTNG_ERR_INVALID;
345 goto error;
346 }
347
2e8269f7
DG
348 /* Validate buffer type. */
349 switch (type) {
350 case LTTNG_BUFFER_PER_PID:
0a9c6494 351 break;
2e8269f7
DG
352 case LTTNG_BUFFER_PER_UID:
353 break;
354 default:
355 ret = LTTNG_ERR_BUFFER_NOT_SUPPORTED;
356 goto error;
357 }
358
7885e399 359 /* Create UST channel */
b63d638b 360 uchan = trace_ust_create_channel(attr, domain);
7885e399 361 if (uchan == NULL) {
f73fabfd 362 ret = LTTNG_ERR_FATAL;
7885e399
DG
363 goto error;
364 }
51755dc8 365
58f3ca76 366 uchan->enabled = 1;
7972aab2
DG
367 if (trace_ust_is_max_id(usess->used_channel_id)) {
368 ret = LTTNG_ERR_UST_CHAN_FAIL;
369 goto error;
370 }
371 uchan->id = trace_ust_get_next_chan_id(usess);
372
373 DBG2("Channel %s is being created for UST with buffer %d and id %" PRIu64,
374 uchan->name, type, uchan->id);
375
376 /* Flag session buffer type. */
377 if (!usess->buffer_type_changed) {
378 usess->buffer_type = type;
379 usess->buffer_type_changed = 1;
380 } else if (usess->buffer_type != type) {
381 /* Buffer type was already set. Refuse to create channel. */
382 ret = LTTNG_ERR_BUFFER_TYPE_MISMATCH;
7885e399
DG
383 goto error_free_chan;
384 }
385
7972aab2
DG
386 /* Enable channel for global domain */
387 ret = ust_app_create_channel_glb(usess, uchan);
49c336c1 388 if (ret < 0 && ret != -LTTNG_UST_ERR_EXIST) {
f73fabfd 389 ret = LTTNG_ERR_UST_CHAN_FAIL;
7885e399
DG
390 goto error_free_chan;
391 }
392
fc34caaa
DG
393 /* Adding the channel to the channel hash table. */
394 rcu_read_lock();
ad7a9107
DG
395 if (strncmp(uchan->name, DEFAULT_METADATA_NAME,
396 sizeof(uchan->name))) {
397 lttng_ht_add_unique_str(usess->domain_global.channels, &uchan->node);
84ad93e8
DG
398 } else {
399 /*
400 * Copy channel attribute to session if this is metadata so if NO
401 * application exists we can access that data in the shadow copy during
402 * the global update of newly registered application.
403 */
404 memcpy(&usess->metadata_attr, &uchan->attr,
405 sizeof(usess->metadata_attr));
ad7a9107 406 }
fc34caaa
DG
407 rcu_read_unlock();
408
7885e399 409 DBG2("Channel %s created successfully", uchan->name);
b63d638b
JG
410 if (domain != LTTNG_DOMAIN_UST) {
411 struct agent *agt = trace_ust_find_agent(usess, domain);
412
413 if (!agt) {
414 agt = agent_create(domain);
415 if (!agt) {
416 ret = LTTNG_ERR_NOMEM;
417 goto error_free_chan;
418 }
419 agent_add(agt, usess->agents);
420 }
421 }
7885e399
DG
422
423 free(defattr);
f73fabfd 424 return LTTNG_OK;
7885e399
DG
425
426error_free_chan:
24d1723f
DG
427 /*
428 * No need to remove the channel from the hash table because at this point
429 * it was not added hence the direct call and no call_rcu().
430 */
7885e399
DG
431 trace_ust_destroy_channel(uchan);
432error:
433 free(defattr);
434 return ret;
435}
436
437/*
438 * Disable UST channel for session and domain.
439 */
7972aab2 440int channel_ust_disable(struct ltt_ust_session *usess,
7885e399
DG
441 struct ltt_ust_channel *uchan)
442{
f73fabfd 443 int ret = LTTNG_OK;
7885e399 444
0525e9ae
DG
445 assert(usess);
446 assert(uchan);
447
7885e399
DG
448 /* Already disabled */
449 if (uchan->enabled == 0) {
450 DBG2("Channel UST %s already disabled", uchan->name);
451 goto end;
452 }
453
7972aab2
DG
454 DBG2("Channel %s being disabled in UST global domain", uchan->name);
455 /* Disable channel for global domain */
456 ret = ust_app_disable_channel_glb(usess, uchan);
49c336c1 457 if (ret < 0 && ret != -LTTNG_UST_ERR_EXIST) {
f73fabfd 458 ret = LTTNG_ERR_UST_CHAN_DISABLE_FAIL;
7885e399
DG
459 goto error;
460 }
461
462 uchan->enabled = 0;
463
464 DBG2("Channel %s disabled successfully", uchan->name);
465
f73fabfd 466 return LTTNG_OK;
7885e399
DG
467
468end:
469error:
470 return ret;
471}
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