Commit | Line | Data |
---|---|---|
20fe2104 DG |
1 | /* |
2 | * Copyright (C) 2011 - David Goulet <david.goulet@polymtl.ca> | |
3 | * | |
d14d33bf AM |
4 | * This program is free software; you can redistribute it and/or modify |
5 | * it under the terms of the GNU General Public License, version 2 only, | |
6 | * as published by the Free Software Foundation. | |
20fe2104 DG |
7 | * |
8 | * This program is distributed in the hope that it will be useful, | |
9 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
10 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
11 | * GNU General Public License for more details. | |
12 | * | |
d14d33bf AM |
13 | * You should have received a copy of the GNU General Public License along |
14 | * with this program; if not, write to the Free Software Foundation, Inc., | |
15 | * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. | |
20fe2104 DG |
16 | */ |
17 | ||
6c1c0768 | 18 | #define _LGPL_SOURCE |
7b395890 | 19 | #include <fcntl.h> |
20fe2104 DG |
20 | #include <stdlib.h> |
21 | #include <stdio.h> | |
f34daff7 | 22 | #include <string.h> |
8c0faa1d | 23 | #include <unistd.h> |
77c7c900 | 24 | #include <inttypes.h> |
20fe2104 | 25 | |
990570ed | 26 | #include <common/common.h> |
db758600 | 27 | #include <common/kernel-ctl/kernel-ctl.h> |
c052142c | 28 | #include <common/kernel-ctl/kernel-ioctl.h> |
42224349 | 29 | #include <common/sessiond-comm/sessiond-comm.h> |
1e307fab | 30 | |
2f77fc4b | 31 | #include "consumer.h" |
4771f025 | 32 | #include "kernel.h" |
6dc3064a | 33 | #include "kernel-consumer.h" |
096102bd | 34 | #include "kern-modules.h" |
834978fd | 35 | #include "utils.h" |
20fe2104 | 36 | |
e1f3997a JD |
37 | /* |
38 | * Key used to reference a channel between the sessiond and the consumer. This | |
39 | * is only read and updated with the session_list lock held. | |
40 | */ | |
41 | static uint64_t next_kernel_channel_key; | |
42 | ||
d65106b1 | 43 | /* |
050349bb | 44 | * Add context on a kernel channel. |
df3c77c8 JG |
45 | * |
46 | * Assumes the ownership of ctx. | |
d65106b1 DG |
47 | */ |
48 | int kernel_add_channel_context(struct ltt_kernel_channel *chan, | |
645328ae | 49 | struct ltt_kernel_context *ctx) |
d65106b1 DG |
50 | { |
51 | int ret; | |
52 | ||
0525e9ae DG |
53 | assert(chan); |
54 | assert(ctx); | |
55 | ||
d65106b1 | 56 | DBG("Adding context to channel %s", chan->channel->name); |
645328ae | 57 | ret = kernctl_add_context(chan->fd, &ctx->ctx); |
d65106b1 | 58 | if (ret < 0) { |
32af2c95 | 59 | switch (-ret) { |
1ae5e83e JD |
60 | case ENOSYS: |
61 | /* Exists but not available for this kernel */ | |
62 | ret = LTTNG_ERR_KERN_CONTEXT_UNAVAILABLE; | |
63 | goto error; | |
64 | case EEXIST: | |
b579acd9 DG |
65 | /* If EEXIST, we just ignore the error */ |
66 | ret = 0; | |
1ae5e83e JD |
67 | goto end; |
68 | default: | |
69 | PERROR("add context ioctl"); | |
70 | ret = LTTNG_ERR_KERN_CONTEXT_FAIL; | |
71 | goto error; | |
b579acd9 | 72 | } |
d65106b1 | 73 | } |
21ed98c1 | 74 | ret = 0; |
d65106b1 | 75 | |
1ae5e83e | 76 | end: |
645328ae | 77 | cds_list_add_tail(&ctx->list, &chan->ctx_list); |
ba985c3a | 78 | ctx->in_list = true; |
df3c77c8 | 79 | ctx = NULL; |
d65106b1 | 80 | error: |
df3c77c8 JG |
81 | if (ctx) { |
82 | trace_kernel_destroy_context(ctx); | |
83 | } | |
d65106b1 DG |
84 | return ret; |
85 | } | |
86 | ||
20fe2104 | 87 | /* |
050349bb DG |
88 | * Create a new kernel session, register it to the kernel tracer and add it to |
89 | * the session daemon session. | |
20fe2104 | 90 | */ |
8c0faa1d | 91 | int kernel_create_session(struct ltt_session *session, int tracer_fd) |
20fe2104 DG |
92 | { |
93 | int ret; | |
94 | struct ltt_kernel_session *lks; | |
95 | ||
0525e9ae DG |
96 | assert(session); |
97 | ||
54012638 | 98 | /* Allocate data structure */ |
dec56f6c | 99 | lks = trace_kernel_create_session(); |
20fe2104 | 100 | if (lks == NULL) { |
54012638 | 101 | ret = -1; |
20fe2104 DG |
102 | goto error; |
103 | } | |
104 | ||
54012638 | 105 | /* Kernel tracer session creation */ |
20fe2104 DG |
106 | ret = kernctl_create_session(tracer_fd); |
107 | if (ret < 0) { | |
df0f840b | 108 | PERROR("ioctl kernel create session"); |
20fe2104 DG |
109 | goto error; |
110 | } | |
111 | ||
20fe2104 | 112 | lks->fd = ret; |
7b395890 DG |
113 | /* Prevent fd duplication after execlp() */ |
114 | ret = fcntl(lks->fd, F_SETFD, FD_CLOEXEC); | |
115 | if (ret < 0) { | |
df0f840b | 116 | PERROR("fcntl session fd"); |
7b395890 DG |
117 | } |
118 | ||
53632229 | 119 | lks->id = session->id; |
3bd1e081 | 120 | lks->consumer_fds_sent = 0; |
8c0faa1d | 121 | session->kernel_session = lks; |
8c0faa1d DG |
122 | |
123 | DBG("Kernel session created (fd: %d)", lks->fd); | |
20fe2104 DG |
124 | |
125 | return 0; | |
126 | ||
127 | error: | |
5f62c685 DG |
128 | if (lks) { |
129 | trace_kernel_destroy_session(lks); | |
130 | } | |
20fe2104 DG |
131 | return ret; |
132 | } | |
133 | ||
134 | /* | |
050349bb DG |
135 | * Create a kernel channel, register it to the kernel tracer and add it to the |
136 | * kernel session. | |
20fe2104 | 137 | */ |
050349bb | 138 | int kernel_create_channel(struct ltt_kernel_session *session, |
fdd9eb17 | 139 | struct lttng_channel *chan) |
20fe2104 DG |
140 | { |
141 | int ret; | |
142 | struct ltt_kernel_channel *lkc; | |
20fe2104 | 143 | |
0525e9ae DG |
144 | assert(session); |
145 | assert(chan); | |
0525e9ae | 146 | |
54012638 | 147 | /* Allocate kernel channel */ |
fdd9eb17 | 148 | lkc = trace_kernel_create_channel(chan); |
54012638 | 149 | if (lkc == NULL) { |
20fe2104 DG |
150 | goto error; |
151 | } | |
152 | ||
ecc48a90 | 153 | DBG3("Kernel create channel %s with attr: %d, %" PRIu64 ", %" PRIu64 ", %u, %u, %d, %d", |
fdd9eb17 | 154 | chan->name, lkc->channel->attr.overwrite, |
173af62f DG |
155 | lkc->channel->attr.subbuf_size, lkc->channel->attr.num_subbuf, |
156 | lkc->channel->attr.switch_timer_interval, lkc->channel->attr.read_timer_interval, | |
ecc48a90 | 157 | lkc->channel->attr.live_timer_interval, lkc->channel->attr.output); |
173af62f | 158 | |
54012638 | 159 | /* Kernel tracer channel creation */ |
f3ed775e | 160 | ret = kernctl_create_channel(session->fd, &lkc->channel->attr); |
20fe2104 | 161 | if (ret < 0) { |
df0f840b | 162 | PERROR("ioctl kernel create channel"); |
20fe2104 DG |
163 | goto error; |
164 | } | |
165 | ||
54012638 | 166 | /* Setup the channel fd */ |
20fe2104 | 167 | lkc->fd = ret; |
7b395890 DG |
168 | /* Prevent fd duplication after execlp() */ |
169 | ret = fcntl(lkc->fd, F_SETFD, FD_CLOEXEC); | |
170 | if (ret < 0) { | |
df0f840b | 171 | PERROR("fcntl session fd"); |
7b395890 DG |
172 | } |
173 | ||
54012638 | 174 | /* Add channel to session */ |
8c0faa1d DG |
175 | cds_list_add(&lkc->list, &session->channel_list.head); |
176 | session->channel_count++; | |
fb5f35b6 | 177 | lkc->session = session; |
e1f3997a | 178 | lkc->key = ++next_kernel_channel_key; |
20fe2104 | 179 | |
e1f3997a JD |
180 | DBG("Kernel channel %s created (fd: %d, key: %" PRIu64 ")", |
181 | lkc->channel->name, lkc->fd, lkc->key); | |
20fe2104 DG |
182 | |
183 | return 0; | |
184 | ||
185 | error: | |
5f62c685 DG |
186 | if (lkc) { |
187 | free(lkc->channel); | |
188 | free(lkc); | |
189 | } | |
54012638 | 190 | return -1; |
20fe2104 | 191 | } |
f34daff7 DG |
192 | |
193 | /* | |
050349bb DG |
194 | * Create a kernel event, enable it to the kernel tracer and add it to the |
195 | * channel event list of the kernel session. | |
49d21f93 | 196 | * We own filter_expression and filter. |
f34daff7 | 197 | */ |
050349bb | 198 | int kernel_create_event(struct lttng_event *ev, |
00a62084 MD |
199 | struct ltt_kernel_channel *channel, |
200 | char *filter_expression, | |
201 | struct lttng_filter_bytecode *filter) | |
f34daff7 DG |
202 | { |
203 | int ret; | |
204 | struct ltt_kernel_event *event; | |
f34daff7 | 205 | |
0525e9ae DG |
206 | assert(ev); |
207 | assert(channel); | |
208 | ||
a969e101 | 209 | /* We pass ownership of filter_expression and filter */ |
00a62084 MD |
210 | event = trace_kernel_create_event(ev, filter_expression, |
211 | filter); | |
54012638 | 212 | if (event == NULL) { |
d87bfb32 | 213 | ret = -1; |
f34daff7 DG |
214 | goto error; |
215 | } | |
216 | ||
f3ed775e DG |
217 | ret = kernctl_create_event(channel->fd, event->event); |
218 | if (ret < 0) { | |
32af2c95 | 219 | switch (-ret) { |
bd29c13d DG |
220 | case EEXIST: |
221 | break; | |
222 | case ENOSYS: | |
223 | WARN("Event type not implemented"); | |
224 | break; | |
8197a339 DG |
225 | case ENOENT: |
226 | WARN("Event %s not found!", ev->name); | |
227 | break; | |
bd29c13d | 228 | default: |
d87bfb32 DG |
229 | PERROR("create event ioctl"); |
230 | } | |
e953ef25 | 231 | goto free_event; |
8c0faa1d | 232 | } |
f34daff7 | 233 | |
d0ae4ea8 | 234 | event->type = ev->type; |
f3ed775e | 235 | event->fd = ret; |
7b395890 DG |
236 | /* Prevent fd duplication after execlp() */ |
237 | ret = fcntl(event->fd, F_SETFD, FD_CLOEXEC); | |
238 | if (ret < 0) { | |
df0f840b | 239 | PERROR("fcntl session fd"); |
7b395890 DG |
240 | } |
241 | ||
00a62084 MD |
242 | if (filter) { |
243 | ret = kernctl_filter(event->fd, filter); | |
244 | if (ret) { | |
245 | goto filter_error; | |
246 | } | |
247 | } | |
248 | ||
249 | ret = kernctl_enable(event->fd); | |
250 | if (ret < 0) { | |
32af2c95 | 251 | switch (-ret) { |
00a62084 MD |
252 | case EEXIST: |
253 | ret = LTTNG_ERR_KERN_EVENT_EXIST; | |
254 | break; | |
255 | default: | |
256 | PERROR("enable kernel event"); | |
257 | break; | |
258 | } | |
259 | goto enable_error; | |
260 | } | |
261 | ||
f3ed775e DG |
262 | /* Add event to event list */ |
263 | cds_list_add(&event->list, &channel->events_list.head); | |
cbbbb275 DG |
264 | channel->event_count++; |
265 | ||
e953ef25 DG |
266 | DBG("Event %s created (fd: %d)", ev->name, event->fd); |
267 | ||
268 | return 0; | |
269 | ||
00a62084 MD |
270 | enable_error: |
271 | filter_error: | |
272 | { | |
273 | int closeret; | |
274 | ||
275 | closeret = close(event->fd); | |
276 | if (closeret) { | |
277 | PERROR("close event fd"); | |
278 | } | |
279 | } | |
e953ef25 DG |
280 | free_event: |
281 | free(event); | |
282 | error: | |
d87bfb32 | 283 | return ret; |
e953ef25 DG |
284 | } |
285 | ||
26cc6b4e | 286 | /* |
050349bb | 287 | * Disable a kernel channel. |
26cc6b4e DG |
288 | */ |
289 | int kernel_disable_channel(struct ltt_kernel_channel *chan) | |
290 | { | |
291 | int ret; | |
292 | ||
0525e9ae DG |
293 | assert(chan); |
294 | ||
26cc6b4e DG |
295 | ret = kernctl_disable(chan->fd); |
296 | if (ret < 0) { | |
df0f840b | 297 | PERROR("disable chan ioctl"); |
26cc6b4e DG |
298 | goto error; |
299 | } | |
300 | ||
301 | chan->enabled = 0; | |
e1f3997a JD |
302 | DBG("Kernel channel %s disabled (fd: %d, key: %" PRIu64 ")", |
303 | chan->channel->name, chan->fd, chan->key); | |
26cc6b4e DG |
304 | |
305 | return 0; | |
306 | ||
307 | error: | |
308 | return ret; | |
309 | } | |
310 | ||
d36b8583 | 311 | /* |
050349bb | 312 | * Enable a kernel channel. |
d36b8583 DG |
313 | */ |
314 | int kernel_enable_channel(struct ltt_kernel_channel *chan) | |
315 | { | |
316 | int ret; | |
317 | ||
0525e9ae DG |
318 | assert(chan); |
319 | ||
d36b8583 | 320 | ret = kernctl_enable(chan->fd); |
32af2c95 | 321 | if (ret < 0 && ret != -EEXIST) { |
df0f840b | 322 | PERROR("Enable kernel chan"); |
d36b8583 DG |
323 | goto error; |
324 | } | |
325 | ||
326 | chan->enabled = 1; | |
e1f3997a JD |
327 | DBG("Kernel channel %s enabled (fd: %d, key: %" PRIu64 ")", |
328 | chan->channel->name, chan->fd, chan->key); | |
d36b8583 DG |
329 | |
330 | return 0; | |
331 | ||
332 | error: | |
333 | return ret; | |
334 | } | |
335 | ||
19e70852 | 336 | /* |
050349bb | 337 | * Enable a kernel event. |
19e70852 DG |
338 | */ |
339 | int kernel_enable_event(struct ltt_kernel_event *event) | |
340 | { | |
341 | int ret; | |
342 | ||
0525e9ae DG |
343 | assert(event); |
344 | ||
19e70852 | 345 | ret = kernctl_enable(event->fd); |
42224349 | 346 | if (ret < 0) { |
32af2c95 | 347 | switch (-ret) { |
42224349 | 348 | case EEXIST: |
f73fabfd | 349 | ret = LTTNG_ERR_KERN_EVENT_EXIST; |
42224349 DG |
350 | break; |
351 | default: | |
352 | PERROR("enable kernel event"); | |
353 | break; | |
354 | } | |
19e70852 DG |
355 | goto error; |
356 | } | |
357 | ||
358 | event->enabled = 1; | |
359 | DBG("Kernel event %s enabled (fd: %d)", event->event->name, event->fd); | |
360 | ||
361 | return 0; | |
362 | ||
363 | error: | |
d36b8583 | 364 | return ret; |
19e70852 DG |
365 | } |
366 | ||
e953ef25 | 367 | /* |
050349bb | 368 | * Disable a kernel event. |
e953ef25 | 369 | */ |
19e70852 | 370 | int kernel_disable_event(struct ltt_kernel_event *event) |
e953ef25 DG |
371 | { |
372 | int ret; | |
19e70852 | 373 | |
0525e9ae DG |
374 | assert(event); |
375 | ||
19e70852 | 376 | ret = kernctl_disable(event->fd); |
42224349 | 377 | if (ret < 0) { |
32af2c95 | 378 | switch (-ret) { |
42224349 | 379 | case EEXIST: |
f73fabfd | 380 | ret = LTTNG_ERR_KERN_EVENT_EXIST; |
42224349 DG |
381 | break; |
382 | default: | |
383 | PERROR("disable kernel event"); | |
384 | break; | |
385 | } | |
19e70852 | 386 | goto error; |
e953ef25 | 387 | } |
f3ed775e | 388 | |
19e70852 DG |
389 | event->enabled = 0; |
390 | DBG("Kernel event %s disabled (fd: %d)", event->event->name, event->fd); | |
391 | ||
f34daff7 DG |
392 | return 0; |
393 | ||
394 | error: | |
d36b8583 | 395 | return ret; |
f34daff7 | 396 | } |
aaf26714 | 397 | |
6e911cad | 398 | |
ccf10263 MD |
399 | int kernel_track_pid(struct ltt_kernel_session *session, int pid) |
400 | { | |
7c493d31 MD |
401 | int ret; |
402 | ||
ccf10263 MD |
403 | DBG("Kernel track PID %d for session id %" PRIu64 ".", |
404 | pid, session->id); | |
7c493d31 MD |
405 | ret = kernctl_track_pid(session->fd, pid); |
406 | if (!ret) { | |
407 | return LTTNG_OK; | |
408 | } | |
32af2c95 | 409 | switch (-ret) { |
7c493d31 MD |
410 | case EINVAL: |
411 | return LTTNG_ERR_INVALID; | |
412 | case ENOMEM: | |
413 | return LTTNG_ERR_NOMEM; | |
414 | case EEXIST: | |
415 | return LTTNG_ERR_PID_TRACKED; | |
416 | default: | |
417 | return LTTNG_ERR_UNK; | |
418 | } | |
ccf10263 MD |
419 | } |
420 | ||
421 | int kernel_untrack_pid(struct ltt_kernel_session *session, int pid) | |
422 | { | |
7c493d31 MD |
423 | int ret; |
424 | ||
ccf10263 MD |
425 | DBG("Kernel untrack PID %d for session id %" PRIu64 ".", |
426 | pid, session->id); | |
7c493d31 MD |
427 | ret = kernctl_untrack_pid(session->fd, pid); |
428 | if (!ret) { | |
429 | return LTTNG_OK; | |
430 | } | |
32af2c95 | 431 | switch (-ret) { |
7c493d31 MD |
432 | case EINVAL: |
433 | return LTTNG_ERR_INVALID; | |
434 | case ENOMEM: | |
435 | return LTTNG_ERR_NOMEM; | |
436 | case ENOENT: | |
437 | return LTTNG_ERR_PID_NOT_TRACKED; | |
438 | default: | |
439 | return LTTNG_ERR_UNK; | |
440 | } | |
ccf10263 MD |
441 | } |
442 | ||
a5dfbb9d MD |
443 | ssize_t kernel_list_tracker_pids(struct ltt_kernel_session *session, |
444 | int **_pids) | |
445 | { | |
446 | int fd, ret; | |
447 | int pid; | |
448 | ssize_t nbmem, count = 0; | |
449 | FILE *fp; | |
450 | int *pids; | |
451 | ||
452 | fd = kernctl_list_tracker_pids(session->fd); | |
453 | if (fd < 0) { | |
454 | PERROR("kernel tracker pids list"); | |
455 | goto error; | |
456 | } | |
457 | ||
458 | fp = fdopen(fd, "r"); | |
459 | if (fp == NULL) { | |
460 | PERROR("kernel tracker pids list fdopen"); | |
461 | goto error_fp; | |
462 | } | |
463 | ||
464 | nbmem = KERNEL_TRACKER_PIDS_INIT_LIST_SIZE; | |
465 | pids = zmalloc(sizeof(*pids) * nbmem); | |
466 | if (pids == NULL) { | |
467 | PERROR("alloc list pids"); | |
468 | count = -ENOMEM; | |
469 | goto end; | |
470 | } | |
471 | ||
472 | while (fscanf(fp, "process { pid = %u; };\n", &pid) == 1) { | |
473 | if (count >= nbmem) { | |
474 | int *new_pids; | |
475 | size_t new_nbmem; | |
476 | ||
477 | new_nbmem = nbmem << 1; | |
478 | DBG("Reallocating pids list from %zu to %zu entries", | |
479 | nbmem, new_nbmem); | |
480 | new_pids = realloc(pids, new_nbmem * sizeof(*new_pids)); | |
481 | if (new_pids == NULL) { | |
482 | PERROR("realloc list events"); | |
483 | free(pids); | |
484 | count = -ENOMEM; | |
485 | goto end; | |
486 | } | |
487 | /* Zero the new memory */ | |
488 | memset(new_pids + nbmem, 0, | |
489 | (new_nbmem - nbmem) * sizeof(*new_pids)); | |
490 | nbmem = new_nbmem; | |
491 | pids = new_pids; | |
492 | } | |
493 | pids[count++] = pid; | |
494 | } | |
495 | ||
496 | *_pids = pids; | |
497 | DBG("Kernel list tracker pids done (%zd pids)", count); | |
498 | end: | |
499 | ret = fclose(fp); /* closes both fp and fd */ | |
500 | if (ret) { | |
501 | PERROR("fclose"); | |
502 | } | |
503 | return count; | |
504 | ||
505 | error_fp: | |
506 | ret = close(fd); | |
507 | if (ret) { | |
508 | PERROR("close"); | |
509 | } | |
510 | error: | |
511 | return -1; | |
512 | } | |
513 | ||
aaf26714 | 514 | /* |
050349bb DG |
515 | * Create kernel metadata, open from the kernel tracer and add it to the |
516 | * kernel session. | |
aaf26714 | 517 | */ |
a4b92340 | 518 | int kernel_open_metadata(struct ltt_kernel_session *session) |
aaf26714 DG |
519 | { |
520 | int ret; | |
74024a21 | 521 | struct ltt_kernel_metadata *lkm = NULL; |
aaf26714 | 522 | |
0525e9ae DG |
523 | assert(session); |
524 | ||
54012638 | 525 | /* Allocate kernel metadata */ |
a4b92340 | 526 | lkm = trace_kernel_create_metadata(); |
54012638 | 527 | if (lkm == NULL) { |
aaf26714 DG |
528 | goto error; |
529 | } | |
530 | ||
54012638 | 531 | /* Kernel tracer metadata creation */ |
f3ed775e | 532 | ret = kernctl_open_metadata(session->fd, &lkm->conf->attr); |
aaf26714 | 533 | if (ret < 0) { |
74024a21 | 534 | goto error_open; |
aaf26714 DG |
535 | } |
536 | ||
8c0faa1d | 537 | lkm->fd = ret; |
7b395890 DG |
538 | /* Prevent fd duplication after execlp() */ |
539 | ret = fcntl(lkm->fd, F_SETFD, FD_CLOEXEC); | |
540 | if (ret < 0) { | |
df0f840b | 541 | PERROR("fcntl session fd"); |
7b395890 DG |
542 | } |
543 | ||
aaf26714 | 544 | session->metadata = lkm; |
8c0faa1d | 545 | |
00e2e675 | 546 | DBG("Kernel metadata opened (fd: %d)", lkm->fd); |
8c0faa1d DG |
547 | |
548 | return 0; | |
549 | ||
74024a21 DG |
550 | error_open: |
551 | trace_kernel_destroy_metadata(lkm); | |
8c0faa1d | 552 | error: |
54012638 | 553 | return -1; |
8c0faa1d DG |
554 | } |
555 | ||
556 | /* | |
050349bb | 557 | * Start tracing session. |
8c0faa1d DG |
558 | */ |
559 | int kernel_start_session(struct ltt_kernel_session *session) | |
560 | { | |
561 | int ret; | |
562 | ||
0525e9ae DG |
563 | assert(session); |
564 | ||
8c0faa1d DG |
565 | ret = kernctl_start_session(session->fd); |
566 | if (ret < 0) { | |
df0f840b | 567 | PERROR("ioctl start session"); |
8c0faa1d DG |
568 | goto error; |
569 | } | |
570 | ||
571 | DBG("Kernel session started"); | |
572 | ||
573 | return 0; | |
574 | ||
575 | error: | |
576 | return ret; | |
577 | } | |
578 | ||
f3ed775e | 579 | /* |
050349bb | 580 | * Make a kernel wait to make sure in-flight probe have completed. |
f3ed775e DG |
581 | */ |
582 | void kernel_wait_quiescent(int fd) | |
583 | { | |
584 | int ret; | |
585 | ||
586 | DBG("Kernel quiescent wait on %d", fd); | |
587 | ||
588 | ret = kernctl_wait_quiescent(fd); | |
589 | if (ret < 0) { | |
df0f840b | 590 | PERROR("wait quiescent ioctl"); |
f3ed775e DG |
591 | ERR("Kernel quiescent wait failed"); |
592 | } | |
593 | } | |
594 | ||
595 | /* | |
f3ed775e DG |
596 | * Force flush buffer of metadata. |
597 | */ | |
598 | int kernel_metadata_flush_buffer(int fd) | |
599 | { | |
600 | int ret; | |
601 | ||
169d2cb7 DG |
602 | DBG("Kernel flushing metadata buffer on fd %d", fd); |
603 | ||
f3ed775e DG |
604 | ret = kernctl_buffer_flush(fd); |
605 | if (ret < 0) { | |
00e2e675 | 606 | ERR("Fail to flush metadata buffers %d (ret: %d)", fd, ret); |
f3ed775e DG |
607 | } |
608 | ||
609 | return 0; | |
610 | } | |
611 | ||
612 | /* | |
050349bb | 613 | * Force flush buffer for channel. |
f3ed775e DG |
614 | */ |
615 | int kernel_flush_buffer(struct ltt_kernel_channel *channel) | |
616 | { | |
617 | int ret; | |
618 | struct ltt_kernel_stream *stream; | |
619 | ||
0525e9ae DG |
620 | assert(channel); |
621 | ||
f3ed775e DG |
622 | DBG("Flush buffer for channel %s", channel->channel->name); |
623 | ||
624 | cds_list_for_each_entry(stream, &channel->stream_list.head, list) { | |
625 | DBG("Flushing channel stream %d", stream->fd); | |
626 | ret = kernctl_buffer_flush(stream->fd); | |
627 | if (ret < 0) { | |
df0f840b | 628 | PERROR("ioctl"); |
f3ed775e DG |
629 | ERR("Fail to flush buffer for stream %d (ret: %d)", |
630 | stream->fd, ret); | |
631 | } | |
632 | } | |
633 | ||
634 | return 0; | |
635 | } | |
636 | ||
8c0faa1d | 637 | /* |
050349bb | 638 | * Stop tracing session. |
8c0faa1d DG |
639 | */ |
640 | int kernel_stop_session(struct ltt_kernel_session *session) | |
641 | { | |
642 | int ret; | |
643 | ||
0525e9ae DG |
644 | assert(session); |
645 | ||
8c0faa1d DG |
646 | ret = kernctl_stop_session(session->fd); |
647 | if (ret < 0) { | |
648 | goto error; | |
649 | } | |
650 | ||
651 | DBG("Kernel session stopped"); | |
652 | ||
653 | return 0; | |
654 | ||
655 | error: | |
656 | return ret; | |
657 | } | |
658 | ||
659 | /* | |
050349bb DG |
660 | * Open stream of channel, register it to the kernel tracer and add it |
661 | * to the stream list of the channel. | |
8c0faa1d | 662 | * |
1cfb4b98 MD |
663 | * Note: given that the streams may appear in random order wrt CPU |
664 | * number (e.g. cpu hotplug), the index value of the stream number in | |
665 | * the stream name is not necessarily linked to the CPU number. | |
666 | * | |
050349bb | 667 | * Return the number of created stream. Else, a negative value. |
8c0faa1d | 668 | */ |
f3ed775e | 669 | int kernel_open_channel_stream(struct ltt_kernel_channel *channel) |
8c0faa1d | 670 | { |
1cfb4b98 | 671 | int ret; |
8c0faa1d DG |
672 | struct ltt_kernel_stream *lks; |
673 | ||
0525e9ae DG |
674 | assert(channel); |
675 | ||
5a47c6a2 | 676 | while ((ret = kernctl_create_stream(channel->fd)) >= 0) { |
1cfb4b98 MD |
677 | lks = trace_kernel_create_stream(channel->channel->name, |
678 | channel->stream_count); | |
8c0faa1d | 679 | if (lks == NULL) { |
799e2c4f MD |
680 | ret = close(ret); |
681 | if (ret) { | |
682 | PERROR("close"); | |
683 | } | |
8c0faa1d DG |
684 | goto error; |
685 | } | |
686 | ||
687 | lks->fd = ret; | |
7b395890 DG |
688 | /* Prevent fd duplication after execlp() */ |
689 | ret = fcntl(lks->fd, F_SETFD, FD_CLOEXEC); | |
690 | if (ret < 0) { | |
df0f840b | 691 | PERROR("fcntl session fd"); |
7b395890 DG |
692 | } |
693 | ||
1624d5b7 JD |
694 | lks->tracefile_size = channel->channel->attr.tracefile_size; |
695 | lks->tracefile_count = channel->channel->attr.tracefile_count; | |
696 | ||
1cfb4b98 | 697 | /* Add stream to channel stream list */ |
8c0faa1d DG |
698 | cds_list_add(&lks->list, &channel->stream_list.head); |
699 | channel->stream_count++; | |
8c0faa1d | 700 | |
00e2e675 DG |
701 | DBG("Kernel stream %s created (fd: %d, state: %d)", lks->name, lks->fd, |
702 | lks->state); | |
54012638 | 703 | } |
8c0faa1d DG |
704 | |
705 | return channel->stream_count; | |
706 | ||
707 | error: | |
54012638 | 708 | return -1; |
8c0faa1d DG |
709 | } |
710 | ||
711 | /* | |
050349bb | 712 | * Open the metadata stream and set it to the kernel session. |
8c0faa1d | 713 | */ |
f3ed775e | 714 | int kernel_open_metadata_stream(struct ltt_kernel_session *session) |
8c0faa1d DG |
715 | { |
716 | int ret; | |
717 | ||
0525e9ae DG |
718 | assert(session); |
719 | ||
8c0faa1d DG |
720 | ret = kernctl_create_stream(session->metadata->fd); |
721 | if (ret < 0) { | |
df0f840b | 722 | PERROR("kernel create metadata stream"); |
8c0faa1d DG |
723 | goto error; |
724 | } | |
725 | ||
726 | DBG("Kernel metadata stream created (fd: %d)", ret); | |
727 | session->metadata_stream_fd = ret; | |
7b395890 DG |
728 | /* Prevent fd duplication after execlp() */ |
729 | ret = fcntl(session->metadata_stream_fd, F_SETFD, FD_CLOEXEC); | |
730 | if (ret < 0) { | |
df0f840b | 731 | PERROR("fcntl session fd"); |
7b395890 | 732 | } |
aaf26714 DG |
733 | |
734 | return 0; | |
735 | ||
736 | error: | |
54012638 | 737 | return -1; |
aaf26714 | 738 | } |
2ef84c95 DG |
739 | |
740 | /* | |
9f19cc17 | 741 | * Get the event list from the kernel tracer and return the number of elements. |
2ef84c95 | 742 | */ |
9f19cc17 | 743 | ssize_t kernel_list_events(int tracer_fd, struct lttng_event **events) |
2ef84c95 | 744 | { |
53efb85a | 745 | int fd, ret; |
9f19cc17 DG |
746 | char *event; |
747 | size_t nbmem, count = 0; | |
2ef84c95 | 748 | FILE *fp; |
9f19cc17 | 749 | struct lttng_event *elist; |
2ef84c95 | 750 | |
0525e9ae DG |
751 | assert(events); |
752 | ||
2ef84c95 DG |
753 | fd = kernctl_tracepoint_list(tracer_fd); |
754 | if (fd < 0) { | |
df0f840b | 755 | PERROR("kernel tracepoint list"); |
2ef84c95 DG |
756 | goto error; |
757 | } | |
758 | ||
759 | fp = fdopen(fd, "r"); | |
760 | if (fp == NULL) { | |
df0f840b | 761 | PERROR("kernel tracepoint list fdopen"); |
61b73b12 | 762 | goto error_fp; |
2ef84c95 DG |
763 | } |
764 | ||
765 | /* | |
766 | * Init memory size counter | |
767 | * See kernel-ctl.h for explanation of this value | |
768 | */ | |
6725fe19 | 769 | nbmem = KERNEL_EVENT_INIT_LIST_SIZE; |
ba7f0ae5 | 770 | elist = zmalloc(sizeof(struct lttng_event) * nbmem); |
3b870559 MD |
771 | if (elist == NULL) { |
772 | PERROR("alloc list events"); | |
773 | count = -ENOMEM; | |
774 | goto end; | |
775 | } | |
2ef84c95 | 776 | |
53efb85a | 777 | while (fscanf(fp, "event { name = %m[^;]; };\n", &event) == 1) { |
6725fe19 | 778 | if (count >= nbmem) { |
3b870559 | 779 | struct lttng_event *new_elist; |
53efb85a | 780 | size_t new_nbmem; |
3b870559 | 781 | |
53efb85a MD |
782 | new_nbmem = nbmem << 1; |
783 | DBG("Reallocating event list from %zu to %zu bytes", | |
784 | nbmem, new_nbmem); | |
785 | new_elist = realloc(elist, new_nbmem * sizeof(struct lttng_event)); | |
3b870559 | 786 | if (new_elist == NULL) { |
df0f840b | 787 | PERROR("realloc list events"); |
3b870559 MD |
788 | free(event); |
789 | free(elist); | |
61b73b12 MD |
790 | count = -ENOMEM; |
791 | goto end; | |
2ef84c95 | 792 | } |
53efb85a MD |
793 | /* Zero the new memory */ |
794 | memset(new_elist + nbmem, 0, | |
795 | (new_nbmem - nbmem) * sizeof(struct lttng_event)); | |
796 | nbmem = new_nbmem; | |
3b870559 | 797 | elist = new_elist; |
2ef84c95 | 798 | } |
99497cd0 MD |
799 | strncpy(elist[count].name, event, LTTNG_SYMBOL_NAME_LEN); |
800 | elist[count].name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0'; | |
67b9d018 | 801 | elist[count].enabled = -1; |
9f19cc17 | 802 | count++; |
3b870559 | 803 | free(event); |
2ef84c95 DG |
804 | } |
805 | ||
9f19cc17 | 806 | *events = elist; |
ced2f820 | 807 | DBG("Kernel list events done (%zu events)", count); |
61b73b12 | 808 | end: |
799e2c4f MD |
809 | ret = fclose(fp); /* closes both fp and fd */ |
810 | if (ret) { | |
811 | PERROR("fclose"); | |
812 | } | |
9f19cc17 | 813 | return count; |
2ef84c95 | 814 | |
61b73b12 | 815 | error_fp: |
799e2c4f MD |
816 | ret = close(fd); |
817 | if (ret) { | |
818 | PERROR("close"); | |
819 | } | |
2ef84c95 DG |
820 | error: |
821 | return -1; | |
822 | } | |
096102bd DG |
823 | |
824 | /* | |
825 | * Get kernel version and validate it. | |
826 | */ | |
88076e89 JD |
827 | int kernel_validate_version(int tracer_fd, |
828 | struct lttng_kernel_tracer_version *version, | |
829 | struct lttng_kernel_tracer_abi_version *abi_version) | |
096102bd DG |
830 | { |
831 | int ret; | |
096102bd | 832 | |
88076e89 | 833 | ret = kernctl_tracer_version(tracer_fd, version); |
096102bd | 834 | if (ret < 0) { |
521dd134 | 835 | ERR("Failed to retrieve the lttng-modules version"); |
096102bd DG |
836 | goto error; |
837 | } | |
838 | ||
839 | /* Validate version */ | |
88076e89 | 840 | if (version->major != VERSION_MAJOR) { |
c052142c | 841 | ERR("Kernel tracer major version (%d) is not compatible with lttng-tools major version (%d)", |
88076e89 | 842 | version->major, VERSION_MAJOR); |
096102bd | 843 | goto error_version; |
096102bd | 844 | } |
88076e89 | 845 | ret = kernctl_tracer_abi_version(tracer_fd, abi_version); |
c052142c | 846 | if (ret < 0) { |
521dd134 | 847 | ERR("Failed to retrieve lttng-modules ABI version"); |
c052142c MD |
848 | goto error; |
849 | } | |
88076e89 | 850 | if (abi_version->major != LTTNG_MODULES_ABI_MAJOR_VERSION) { |
521dd134 | 851 | ERR("Kernel tracer ABI version (%d.%d) does not match the expected ABI major version (%d.*)", |
88076e89 | 852 | abi_version->major, abi_version->minor, |
c052142c MD |
853 | LTTNG_MODULES_ABI_MAJOR_VERSION); |
854 | goto error; | |
855 | } | |
856 | DBG2("Kernel tracer version validated (%d.%d, ABI %d.%d)", | |
88076e89 JD |
857 | version->major, version->minor, |
858 | abi_version->major, abi_version->minor); | |
096102bd DG |
859 | return 0; |
860 | ||
861 | error_version: | |
096102bd DG |
862 | ret = -1; |
863 | ||
864 | error: | |
521dd134 | 865 | ERR("Kernel tracer version check failed; kernel tracing will not be available"); |
096102bd DG |
866 | return ret; |
867 | } | |
335a95b7 MD |
868 | |
869 | /* | |
870 | * Kernel work-arounds called at the start of sessiond main(). | |
871 | */ | |
872 | int init_kernel_workarounds(void) | |
873 | { | |
8936c33a | 874 | int ret; |
335a95b7 MD |
875 | FILE *fp; |
876 | ||
877 | /* | |
878 | * boot_id needs to be read once before being used concurrently | |
879 | * to deal with a Linux kernel race. A fix is proposed for | |
880 | * upstream, but the work-around is needed for older kernels. | |
881 | */ | |
882 | fp = fopen("/proc/sys/kernel/random/boot_id", "r"); | |
883 | if (!fp) { | |
884 | goto end_boot_id; | |
885 | } | |
886 | while (!feof(fp)) { | |
887 | char buf[37] = ""; | |
888 | ||
8936c33a DG |
889 | ret = fread(buf, 1, sizeof(buf), fp); |
890 | if (ret < 0) { | |
891 | /* Ignore error, we don't really care */ | |
892 | } | |
335a95b7 | 893 | } |
799e2c4f MD |
894 | ret = fclose(fp); |
895 | if (ret) { | |
896 | PERROR("fclose"); | |
897 | } | |
335a95b7 | 898 | end_boot_id: |
335a95b7 MD |
899 | return 0; |
900 | } | |
2f77fc4b DG |
901 | |
902 | /* | |
903 | * Complete teardown of a kernel session. | |
904 | */ | |
905 | void kernel_destroy_session(struct ltt_kernel_session *ksess) | |
906 | { | |
907 | if (ksess == NULL) { | |
908 | DBG3("No kernel session when tearing down session"); | |
909 | return; | |
910 | } | |
911 | ||
912 | DBG("Tearing down kernel session"); | |
913 | ||
07b86b52 | 914 | /* |
15dc512a DG |
915 | * Destroy channels on the consumer if at least one FD has been sent and we |
916 | * are in no output mode because the streams are in *no* monitor mode so we | |
917 | * have to send a command to clean them up or else they leaked. | |
07b86b52 | 918 | */ |
15dc512a | 919 | if (!ksess->output_traces && ksess->consumer_fds_sent) { |
07b86b52 JD |
920 | int ret; |
921 | struct consumer_socket *socket; | |
922 | struct lttng_ht_iter iter; | |
923 | ||
924 | /* For each consumer socket. */ | |
d069d577 | 925 | rcu_read_lock(); |
07b86b52 JD |
926 | cds_lfht_for_each_entry(ksess->consumer->socks->ht, &iter.iter, |
927 | socket, node.node) { | |
928 | struct ltt_kernel_channel *chan; | |
929 | ||
930 | /* For each channel, ask the consumer to destroy it. */ | |
931 | cds_list_for_each_entry(chan, &ksess->channel_list.head, list) { | |
932 | ret = kernel_consumer_destroy_channel(socket, chan); | |
933 | if (ret < 0) { | |
934 | /* Consumer is probably dead. Use next socket. */ | |
935 | continue; | |
936 | } | |
937 | } | |
938 | } | |
d069d577 | 939 | rcu_read_unlock(); |
07b86b52 JD |
940 | } |
941 | ||
2f77fc4b DG |
942 | /* Close any relayd session */ |
943 | consumer_output_send_destroy_relayd(ksess->consumer); | |
944 | ||
945 | trace_kernel_destroy_session(ksess); | |
946 | } | |
fb5f35b6 DG |
947 | |
948 | /* | |
949 | * Destroy a kernel channel object. It does not do anything on the tracer side. | |
950 | */ | |
951 | void kernel_destroy_channel(struct ltt_kernel_channel *kchan) | |
952 | { | |
953 | struct ltt_kernel_session *ksess = NULL; | |
954 | ||
955 | assert(kchan); | |
956 | assert(kchan->channel); | |
957 | ||
958 | DBG3("Kernel destroy channel %s", kchan->channel->name); | |
959 | ||
960 | /* Update channel count of associated session. */ | |
961 | if (kchan->session) { | |
962 | /* Keep pointer reference so we can update it after the destroy. */ | |
963 | ksess = kchan->session; | |
964 | } | |
965 | ||
966 | trace_kernel_destroy_channel(kchan); | |
967 | ||
968 | /* | |
969 | * At this point the kernel channel is not visible anymore. This is safe | |
970 | * since in order to work on a visible kernel session, the tracing session | |
971 | * lock (ltt_session.lock) MUST be acquired. | |
972 | */ | |
973 | if (ksess) { | |
974 | ksess->channel_count--; | |
975 | } | |
976 | } | |
6dc3064a DG |
977 | |
978 | /* | |
979 | * Take a snapshot for a given kernel session. | |
980 | * | |
2a06df8d | 981 | * Return 0 on success or else return a LTTNG_ERR code. |
6dc3064a DG |
982 | */ |
983 | int kernel_snapshot_record(struct ltt_kernel_session *ksess, | |
d07ceecd MD |
984 | struct snapshot_output *output, int wait, |
985 | uint64_t nb_packets_per_stream) | |
6dc3064a | 986 | { |
2a06df8d | 987 | int err, ret, saved_metadata_fd; |
6dc3064a DG |
988 | struct consumer_socket *socket; |
989 | struct lttng_ht_iter iter; | |
990 | struct ltt_kernel_metadata *saved_metadata; | |
991 | ||
992 | assert(ksess); | |
993 | assert(ksess->consumer); | |
994 | assert(output); | |
995 | ||
996 | DBG("Kernel snapshot record started"); | |
997 | ||
998 | /* Save current metadata since the following calls will change it. */ | |
999 | saved_metadata = ksess->metadata; | |
1000 | saved_metadata_fd = ksess->metadata_stream_fd; | |
1001 | ||
1002 | rcu_read_lock(); | |
1003 | ||
1004 | ret = kernel_open_metadata(ksess); | |
1005 | if (ret < 0) { | |
1006 | ret = LTTNG_ERR_KERN_META_FAIL; | |
1007 | goto error; | |
1008 | } | |
1009 | ||
1010 | ret = kernel_open_metadata_stream(ksess); | |
1011 | if (ret < 0) { | |
1012 | ret = LTTNG_ERR_KERN_META_FAIL; | |
1013 | goto error_open_stream; | |
1014 | } | |
1015 | ||
1016 | /* Send metadata to consumer and snapshot everything. */ | |
1017 | cds_lfht_for_each_entry(ksess->consumer->socks->ht, &iter.iter, | |
1018 | socket, node.node) { | |
1019 | struct consumer_output *saved_output; | |
1020 | struct ltt_kernel_channel *chan; | |
6dc3064a DG |
1021 | |
1022 | /* | |
1023 | * Temporarly switch consumer output for our snapshot output. As long | |
1024 | * as the session lock is taken, this is safe. | |
1025 | */ | |
1026 | saved_output = ksess->consumer; | |
1027 | ksess->consumer = output->consumer; | |
1028 | ||
1029 | pthread_mutex_lock(socket->lock); | |
1030 | /* This stream must not be monitored by the consumer. */ | |
07b86b52 | 1031 | ret = kernel_consumer_add_metadata(socket, ksess, 0); |
6dc3064a | 1032 | pthread_mutex_unlock(socket->lock); |
07b86b52 | 1033 | /* Put back the saved consumer output into the session. */ |
6dc3064a DG |
1034 | ksess->consumer = saved_output; |
1035 | if (ret < 0) { | |
1036 | ret = LTTNG_ERR_KERN_CONSUMER_FAIL; | |
1037 | goto error_consumer; | |
1038 | } | |
1039 | ||
1040 | /* For each channel, ask the consumer to snapshot it. */ | |
1041 | cds_list_for_each_entry(chan, &ksess->channel_list.head, list) { | |
1042 | ret = consumer_snapshot_channel(socket, chan->fd, output, 0, | |
5c786ded JD |
1043 | ksess->uid, ksess->gid, |
1044 | DEFAULT_KERNEL_TRACE_DIR, wait, | |
d07ceecd | 1045 | nb_packets_per_stream); |
6dc3064a DG |
1046 | if (ret < 0) { |
1047 | ret = LTTNG_ERR_KERN_CONSUMER_FAIL; | |
2a06df8d DG |
1048 | (void) kernel_consumer_destroy_metadata(socket, |
1049 | ksess->metadata); | |
6dc3064a DG |
1050 | goto error_consumer; |
1051 | } | |
1052 | } | |
1053 | ||
1054 | /* Snapshot metadata, */ | |
1055 | ret = consumer_snapshot_channel(socket, ksess->metadata->fd, output, | |
5c786ded | 1056 | 1, ksess->uid, ksess->gid, |
d07ceecd | 1057 | DEFAULT_KERNEL_TRACE_DIR, wait, 0); |
6dc3064a DG |
1058 | if (ret < 0) { |
1059 | ret = LTTNG_ERR_KERN_CONSUMER_FAIL; | |
1060 | goto error_consumer; | |
1061 | } | |
07b86b52 JD |
1062 | |
1063 | /* | |
1064 | * The metadata snapshot is done, ask the consumer to destroy it since | |
1065 | * it's not monitored on the consumer side. | |
1066 | */ | |
1067 | (void) kernel_consumer_destroy_metadata(socket, ksess->metadata); | |
6dc3064a DG |
1068 | } |
1069 | ||
fac41e72 DG |
1070 | ret = LTTNG_OK; |
1071 | ||
6dc3064a DG |
1072 | error_consumer: |
1073 | /* Close newly opened metadata stream. It's now on the consumer side. */ | |
2a06df8d DG |
1074 | err = close(ksess->metadata_stream_fd); |
1075 | if (err < 0) { | |
6dc3064a DG |
1076 | PERROR("close snapshot kernel"); |
1077 | } | |
1078 | ||
1079 | error_open_stream: | |
1080 | trace_kernel_destroy_metadata(ksess->metadata); | |
1081 | error: | |
1082 | /* Restore metadata state.*/ | |
1083 | ksess->metadata = saved_metadata; | |
1084 | ksess->metadata_stream_fd = saved_metadata_fd; | |
1085 | ||
1086 | rcu_read_unlock(); | |
1087 | return ret; | |
1088 | } | |
834978fd DG |
1089 | |
1090 | /* | |
1091 | * Get the syscall mask array from the kernel tracer. | |
1092 | * | |
1093 | * Return 0 on success else a negative value. In both case, syscall_mask should | |
1094 | * be freed. | |
1095 | */ | |
1096 | int kernel_syscall_mask(int chan_fd, char **syscall_mask, uint32_t *nr_bits) | |
1097 | { | |
1098 | assert(syscall_mask); | |
1099 | assert(nr_bits); | |
1100 | ||
1101 | return kernctl_syscall_mask(chan_fd, syscall_mask, nr_bits); | |
1102 | } | |
6e21424e JR |
1103 | |
1104 | /* | |
1105 | * Check for the support of the RING_BUFFER_SNAPSHOT_SAMPLE_POSITIONS via abi | |
1106 | * version number. | |
1107 | * | |
1108 | * Return 1 on success, 0 when feature is not supported, negative value in case | |
1109 | * of errors. | |
1110 | */ | |
1111 | int kernel_supports_ring_buffer_snapshot_sample_positions(int tracer_fd) | |
1112 | { | |
1113 | int ret = 0; // Not supported by default | |
1114 | struct lttng_kernel_tracer_abi_version abi; | |
1115 | ||
1116 | ret = kernctl_tracer_abi_version(tracer_fd, &abi); | |
1117 | if (ret < 0) { | |
1118 | ERR("Failed to retrieve lttng-modules ABI version"); | |
1119 | goto error; | |
1120 | } | |
1121 | ||
1122 | /* | |
1123 | * RING_BUFFER_SNAPSHOT_SAMPLE_POSITIONS was introduced in 2.3 | |
1124 | */ | |
1125 | if (abi.major >= 2 && abi.minor >= 3) { | |
1126 | /* Supported */ | |
1127 | ret = 1; | |
1128 | } else { | |
1129 | /* Not supported */ | |
1130 | ret = 0; | |
1131 | } | |
1132 | error: | |
1133 | return ret; | |
1134 | } |