Commit | Line | Data |
---|---|---|
20fe2104 DG |
1 | /* |
2 | * Copyright (C) 2011 - David Goulet <david.goulet@polymtl.ca> | |
3 | * | |
4 | * This program is free software; you can redistribute it and/or | |
5 | * modify it under the terms of the GNU General Public License | |
82a3637f DG |
6 | * as published by the Free Software Foundation; only version 2 |
7 | * of the License. | |
20fe2104 DG |
8 | * |
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. | |
13 | * | |
14 | * You should have received a copy of the GNU General Public License | |
15 | * along with this program; if not, write to the Free Software | |
16 | * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. | |
17 | */ | |
18 | ||
8c0faa1d | 19 | #define _GNU_SOURCE |
20fe2104 | 20 | #include <errno.h> |
7b395890 | 21 | #include <fcntl.h> |
20fe2104 DG |
22 | #include <stdlib.h> |
23 | #include <stdio.h> | |
f34daff7 | 24 | #include <string.h> |
8c0faa1d | 25 | #include <unistd.h> |
20fe2104 | 26 | |
990570ed | 27 | #include <common/common.h> |
db758600 | 28 | #include <common/kernel-ctl/kernel-ctl.h> |
1e307fab | 29 | |
4771f025 | 30 | #include "kernel.h" |
096102bd | 31 | #include "kern-modules.h" |
20fe2104 | 32 | |
d65106b1 | 33 | /* |
050349bb | 34 | * Add context on a kernel channel. |
d65106b1 DG |
35 | */ |
36 | int kernel_add_channel_context(struct ltt_kernel_channel *chan, | |
37 | struct lttng_kernel_context *ctx) | |
38 | { | |
39 | int ret; | |
40 | ||
41 | DBG("Adding context to channel %s", chan->channel->name); | |
42 | ret = kernctl_add_context(chan->fd, ctx); | |
43 | if (ret < 0) { | |
b579acd9 DG |
44 | if (errno != EEXIST) { |
45 | perror("add context ioctl"); | |
46 | } else { | |
47 | /* If EEXIST, we just ignore the error */ | |
48 | ret = 0; | |
49 | } | |
d65106b1 DG |
50 | goto error; |
51 | } | |
52 | ||
ba7f0ae5 | 53 | chan->ctx = zmalloc(sizeof(struct lttng_kernel_context)); |
d65106b1 | 54 | if (chan->ctx == NULL) { |
ba7f0ae5 | 55 | perror("zmalloc event context"); |
d65106b1 DG |
56 | goto error; |
57 | } | |
58 | ||
59 | memcpy(chan->ctx, ctx, sizeof(struct lttng_kernel_context)); | |
60 | ||
61 | return 0; | |
62 | ||
63 | error: | |
64 | return ret; | |
65 | } | |
66 | ||
67 | /* | |
050349bb | 68 | * Add context on a kernel event. |
d65106b1 DG |
69 | */ |
70 | int kernel_add_event_context(struct ltt_kernel_event *event, | |
71 | struct lttng_kernel_context *ctx) | |
72 | { | |
73 | int ret; | |
74 | ||
75 | DBG("Adding context to event %s", event->event->name); | |
76 | ret = kernctl_add_context(event->fd, ctx); | |
77 | if (ret < 0) { | |
78 | perror("add context ioctl"); | |
79 | goto error; | |
80 | } | |
81 | ||
ba7f0ae5 | 82 | event->ctx = zmalloc(sizeof(struct lttng_kernel_context)); |
d65106b1 | 83 | if (event->ctx == NULL) { |
ba7f0ae5 | 84 | perror("zmalloc event context"); |
d65106b1 DG |
85 | goto error; |
86 | } | |
87 | ||
88 | memcpy(event->ctx, ctx, sizeof(struct lttng_kernel_context)); | |
89 | ||
90 | return 0; | |
91 | ||
92 | error: | |
93 | return ret; | |
94 | } | |
95 | ||
20fe2104 | 96 | /* |
050349bb DG |
97 | * Create a new kernel session, register it to the kernel tracer and add it to |
98 | * the session daemon session. | |
20fe2104 | 99 | */ |
8c0faa1d | 100 | int kernel_create_session(struct ltt_session *session, int tracer_fd) |
20fe2104 DG |
101 | { |
102 | int ret; | |
103 | struct ltt_kernel_session *lks; | |
104 | ||
54012638 | 105 | /* Allocate data structure */ |
f9815039 | 106 | lks = trace_kernel_create_session(session->path); |
20fe2104 | 107 | if (lks == NULL) { |
54012638 | 108 | ret = -1; |
20fe2104 DG |
109 | goto error; |
110 | } | |
111 | ||
54012638 | 112 | /* Kernel tracer session creation */ |
20fe2104 DG |
113 | ret = kernctl_create_session(tracer_fd); |
114 | if (ret < 0) { | |
54012638 | 115 | perror("ioctl kernel create session"); |
20fe2104 DG |
116 | goto error; |
117 | } | |
118 | ||
20fe2104 | 119 | lks->fd = ret; |
7b395890 DG |
120 | /* Prevent fd duplication after execlp() */ |
121 | ret = fcntl(lks->fd, F_SETFD, FD_CLOEXEC); | |
122 | if (ret < 0) { | |
123 | perror("fcntl session fd"); | |
124 | } | |
125 | ||
3bd1e081 | 126 | lks->consumer_fds_sent = 0; |
8c0faa1d | 127 | session->kernel_session = lks; |
8c0faa1d DG |
128 | |
129 | DBG("Kernel session created (fd: %d)", lks->fd); | |
20fe2104 DG |
130 | |
131 | return 0; | |
132 | ||
133 | error: | |
134 | return ret; | |
135 | } | |
136 | ||
137 | /* | |
050349bb DG |
138 | * Create a kernel channel, register it to the kernel tracer and add it to the |
139 | * kernel session. | |
20fe2104 | 140 | */ |
050349bb DG |
141 | int kernel_create_channel(struct ltt_kernel_session *session, |
142 | struct lttng_channel *chan, char *path) | |
20fe2104 DG |
143 | { |
144 | int ret; | |
145 | struct ltt_kernel_channel *lkc; | |
20fe2104 | 146 | |
54012638 | 147 | /* Allocate kernel channel */ |
62499ad6 | 148 | lkc = trace_kernel_create_channel(chan, path); |
54012638 | 149 | if (lkc == NULL) { |
20fe2104 DG |
150 | goto error; |
151 | } | |
152 | ||
54012638 | 153 | /* Kernel tracer channel creation */ |
f3ed775e | 154 | ret = kernctl_create_channel(session->fd, &lkc->channel->attr); |
20fe2104 | 155 | if (ret < 0) { |
54012638 | 156 | perror("ioctl kernel create channel"); |
20fe2104 DG |
157 | goto error; |
158 | } | |
159 | ||
54012638 | 160 | /* Setup the channel fd */ |
20fe2104 | 161 | lkc->fd = ret; |
7b395890 DG |
162 | /* Prevent fd duplication after execlp() */ |
163 | ret = fcntl(lkc->fd, F_SETFD, FD_CLOEXEC); | |
164 | if (ret < 0) { | |
165 | perror("fcntl session fd"); | |
166 | } | |
167 | ||
54012638 | 168 | /* Add channel to session */ |
8c0faa1d DG |
169 | cds_list_add(&lkc->list, &session->channel_list.head); |
170 | session->channel_count++; | |
20fe2104 | 171 | |
f3ed775e DG |
172 | DBG("Kernel channel %s created (fd: %d and path: %s)", |
173 | lkc->channel->name, lkc->fd, lkc->pathname); | |
20fe2104 DG |
174 | |
175 | return 0; | |
176 | ||
177 | error: | |
54012638 | 178 | return -1; |
20fe2104 | 179 | } |
f34daff7 DG |
180 | |
181 | /* | |
050349bb DG |
182 | * Create a kernel event, enable it to the kernel tracer and add it to the |
183 | * channel event list of the kernel session. | |
f34daff7 | 184 | */ |
050349bb DG |
185 | int kernel_create_event(struct lttng_event *ev, |
186 | struct ltt_kernel_channel *channel) | |
f34daff7 DG |
187 | { |
188 | int ret; | |
189 | struct ltt_kernel_event *event; | |
f34daff7 | 190 | |
62499ad6 | 191 | event = trace_kernel_create_event(ev); |
54012638 | 192 | if (event == NULL) { |
d87bfb32 | 193 | ret = -1; |
f34daff7 DG |
194 | goto error; |
195 | } | |
196 | ||
f3ed775e DG |
197 | ret = kernctl_create_event(channel->fd, event->event); |
198 | if (ret < 0) { | |
d87bfb32 DG |
199 | if (errno != EEXIST) { |
200 | PERROR("create event ioctl"); | |
201 | } | |
202 | ret = -errno; | |
e953ef25 | 203 | goto free_event; |
8c0faa1d | 204 | } |
f34daff7 | 205 | |
5f822d0a DG |
206 | /* |
207 | * LTTNG_KERNEL_SYSCALL event creation will return 0 on success. However | |
208 | * this FD must not be added to the event list. | |
209 | */ | |
210 | if (ret == 0 && event->event->instrumentation == LTTNG_KERNEL_SYSCALL) { | |
211 | DBG2("Kernel event syscall creation success"); | |
212 | goto end; | |
213 | } | |
214 | ||
f3ed775e | 215 | event->fd = ret; |
7b395890 DG |
216 | /* Prevent fd duplication after execlp() */ |
217 | ret = fcntl(event->fd, F_SETFD, FD_CLOEXEC); | |
218 | if (ret < 0) { | |
219 | perror("fcntl session fd"); | |
220 | } | |
221 | ||
f3ed775e DG |
222 | /* Add event to event list */ |
223 | cds_list_add(&event->list, &channel->events_list.head); | |
cbbbb275 DG |
224 | channel->event_count++; |
225 | ||
e953ef25 DG |
226 | DBG("Event %s created (fd: %d)", ev->name, event->fd); |
227 | ||
5f822d0a | 228 | end: |
e953ef25 DG |
229 | return 0; |
230 | ||
231 | free_event: | |
232 | free(event); | |
233 | error: | |
d87bfb32 | 234 | return ret; |
e953ef25 DG |
235 | } |
236 | ||
26cc6b4e | 237 | /* |
050349bb | 238 | * Disable a kernel channel. |
26cc6b4e DG |
239 | */ |
240 | int kernel_disable_channel(struct ltt_kernel_channel *chan) | |
241 | { | |
242 | int ret; | |
243 | ||
244 | ret = kernctl_disable(chan->fd); | |
245 | if (ret < 0) { | |
246 | perror("disable chan ioctl"); | |
247 | ret = errno; | |
248 | goto error; | |
249 | } | |
250 | ||
251 | chan->enabled = 0; | |
252 | DBG("Kernel channel %s disabled (fd: %d)", chan->channel->name, chan->fd); | |
253 | ||
254 | return 0; | |
255 | ||
256 | error: | |
257 | return ret; | |
258 | } | |
259 | ||
d36b8583 | 260 | /* |
050349bb | 261 | * Enable a kernel channel. |
d36b8583 DG |
262 | */ |
263 | int kernel_enable_channel(struct ltt_kernel_channel *chan) | |
264 | { | |
265 | int ret; | |
266 | ||
267 | ret = kernctl_enable(chan->fd); | |
54d01ffb DG |
268 | if (ret < 0 && errno != EEXIST) { |
269 | perror("Enable kernel chan"); | |
d36b8583 DG |
270 | goto error; |
271 | } | |
272 | ||
273 | chan->enabled = 1; | |
274 | DBG("Kernel channel %s enabled (fd: %d)", chan->channel->name, chan->fd); | |
275 | ||
276 | return 0; | |
277 | ||
278 | error: | |
279 | return ret; | |
280 | } | |
281 | ||
19e70852 | 282 | /* |
050349bb | 283 | * Enable a kernel event. |
19e70852 DG |
284 | */ |
285 | int kernel_enable_event(struct ltt_kernel_event *event) | |
286 | { | |
287 | int ret; | |
288 | ||
289 | ret = kernctl_enable(event->fd); | |
54d01ffb DG |
290 | if (ret < 0 && errno != EEXIST) { |
291 | perror("enable kernel event"); | |
19e70852 DG |
292 | goto error; |
293 | } | |
294 | ||
295 | event->enabled = 1; | |
296 | DBG("Kernel event %s enabled (fd: %d)", event->event->name, event->fd); | |
297 | ||
298 | return 0; | |
299 | ||
300 | error: | |
d36b8583 | 301 | return ret; |
19e70852 DG |
302 | } |
303 | ||
e953ef25 | 304 | /* |
050349bb | 305 | * Disable a kernel event. |
e953ef25 | 306 | */ |
19e70852 | 307 | int kernel_disable_event(struct ltt_kernel_event *event) |
e953ef25 DG |
308 | { |
309 | int ret; | |
19e70852 DG |
310 | |
311 | ret = kernctl_disable(event->fd); | |
54d01ffb DG |
312 | if (ret < 0 && errno != EEXIST) { |
313 | perror("disable kernel event"); | |
19e70852 | 314 | goto error; |
e953ef25 | 315 | } |
f3ed775e | 316 | |
19e70852 DG |
317 | event->enabled = 0; |
318 | DBG("Kernel event %s disabled (fd: %d)", event->event->name, event->fd); | |
319 | ||
f34daff7 DG |
320 | return 0; |
321 | ||
322 | error: | |
d36b8583 | 323 | return ret; |
f34daff7 | 324 | } |
aaf26714 DG |
325 | |
326 | /* | |
050349bb DG |
327 | * Create kernel metadata, open from the kernel tracer and add it to the |
328 | * kernel session. | |
aaf26714 | 329 | */ |
58a97671 | 330 | int kernel_open_metadata(struct ltt_kernel_session *session, char *path) |
aaf26714 DG |
331 | { |
332 | int ret; | |
333 | struct ltt_kernel_metadata *lkm; | |
aaf26714 | 334 | |
54012638 | 335 | /* Allocate kernel metadata */ |
62499ad6 | 336 | lkm = trace_kernel_create_metadata(path); |
54012638 | 337 | if (lkm == NULL) { |
aaf26714 DG |
338 | goto error; |
339 | } | |
340 | ||
54012638 | 341 | /* Kernel tracer metadata creation */ |
f3ed775e | 342 | ret = kernctl_open_metadata(session->fd, &lkm->conf->attr); |
aaf26714 DG |
343 | if (ret < 0) { |
344 | goto error; | |
345 | } | |
346 | ||
8c0faa1d | 347 | lkm->fd = ret; |
7b395890 DG |
348 | /* Prevent fd duplication after execlp() */ |
349 | ret = fcntl(lkm->fd, F_SETFD, FD_CLOEXEC); | |
350 | if (ret < 0) { | |
351 | perror("fcntl session fd"); | |
352 | } | |
353 | ||
aaf26714 | 354 | session->metadata = lkm; |
8c0faa1d | 355 | |
54012638 | 356 | DBG("Kernel metadata opened (fd: %d and path: %s)", lkm->fd, lkm->pathname); |
8c0faa1d DG |
357 | |
358 | return 0; | |
359 | ||
360 | error: | |
54012638 | 361 | return -1; |
8c0faa1d DG |
362 | } |
363 | ||
364 | /* | |
050349bb | 365 | * Start tracing session. |
8c0faa1d DG |
366 | */ |
367 | int kernel_start_session(struct ltt_kernel_session *session) | |
368 | { | |
369 | int ret; | |
370 | ||
371 | ret = kernctl_start_session(session->fd); | |
372 | if (ret < 0) { | |
f3ed775e | 373 | perror("ioctl start session"); |
8c0faa1d DG |
374 | goto error; |
375 | } | |
376 | ||
377 | DBG("Kernel session started"); | |
378 | ||
379 | return 0; | |
380 | ||
381 | error: | |
382 | return ret; | |
383 | } | |
384 | ||
f3ed775e | 385 | /* |
050349bb | 386 | * Make a kernel wait to make sure in-flight probe have completed. |
f3ed775e DG |
387 | */ |
388 | void kernel_wait_quiescent(int fd) | |
389 | { | |
390 | int ret; | |
391 | ||
392 | DBG("Kernel quiescent wait on %d", fd); | |
393 | ||
394 | ret = kernctl_wait_quiescent(fd); | |
395 | if (ret < 0) { | |
396 | perror("wait quiescent ioctl"); | |
397 | ERR("Kernel quiescent wait failed"); | |
398 | } | |
399 | } | |
400 | ||
d0254c7c | 401 | /* |
050349bb | 402 | * Kernel calibrate |
d0254c7c MD |
403 | */ |
404 | int kernel_calibrate(int fd, struct lttng_kernel_calibrate *calibrate) | |
405 | { | |
406 | int ret; | |
407 | ||
408 | ret = kernctl_calibrate(fd, calibrate); | |
409 | if (ret < 0) { | |
410 | perror("calibrate ioctl"); | |
411 | return -1; | |
412 | } | |
413 | ||
414 | return 0; | |
415 | } | |
416 | ||
417 | ||
f3ed775e | 418 | /* |
f3ed775e DG |
419 | * Force flush buffer of metadata. |
420 | */ | |
421 | int kernel_metadata_flush_buffer(int fd) | |
422 | { | |
423 | int ret; | |
424 | ||
425 | ret = kernctl_buffer_flush(fd); | |
426 | if (ret < 0) { | |
427 | ERR("Fail to flush metadata buffers %d (ret: %d", fd, ret); | |
428 | } | |
429 | ||
430 | return 0; | |
431 | } | |
432 | ||
433 | /* | |
050349bb | 434 | * Force flush buffer for channel. |
f3ed775e DG |
435 | */ |
436 | int kernel_flush_buffer(struct ltt_kernel_channel *channel) | |
437 | { | |
438 | int ret; | |
439 | struct ltt_kernel_stream *stream; | |
440 | ||
441 | DBG("Flush buffer for channel %s", channel->channel->name); | |
442 | ||
443 | cds_list_for_each_entry(stream, &channel->stream_list.head, list) { | |
444 | DBG("Flushing channel stream %d", stream->fd); | |
445 | ret = kernctl_buffer_flush(stream->fd); | |
446 | if (ret < 0) { | |
447 | perror("ioctl"); | |
448 | ERR("Fail to flush buffer for stream %d (ret: %d)", | |
449 | stream->fd, ret); | |
450 | } | |
451 | } | |
452 | ||
453 | return 0; | |
454 | } | |
455 | ||
8c0faa1d | 456 | /* |
050349bb | 457 | * Stop tracing session. |
8c0faa1d DG |
458 | */ |
459 | int kernel_stop_session(struct ltt_kernel_session *session) | |
460 | { | |
461 | int ret; | |
462 | ||
463 | ret = kernctl_stop_session(session->fd); | |
464 | if (ret < 0) { | |
465 | goto error; | |
466 | } | |
467 | ||
468 | DBG("Kernel session stopped"); | |
469 | ||
470 | return 0; | |
471 | ||
472 | error: | |
473 | return ret; | |
474 | } | |
475 | ||
476 | /* | |
050349bb DG |
477 | * Open stream of channel, register it to the kernel tracer and add it |
478 | * to the stream list of the channel. | |
8c0faa1d | 479 | * |
050349bb | 480 | * Return the number of created stream. Else, a negative value. |
8c0faa1d | 481 | */ |
f3ed775e | 482 | int kernel_open_channel_stream(struct ltt_kernel_channel *channel) |
8c0faa1d DG |
483 | { |
484 | int ret; | |
485 | struct ltt_kernel_stream *lks; | |
486 | ||
487 | while ((ret = kernctl_create_stream(channel->fd)) > 0) { | |
62499ad6 | 488 | lks = trace_kernel_create_stream(); |
8c0faa1d | 489 | if (lks == NULL) { |
54012638 | 490 | close(ret); |
8c0faa1d DG |
491 | goto error; |
492 | } | |
493 | ||
494 | lks->fd = ret; | |
7b395890 DG |
495 | /* Prevent fd duplication after execlp() */ |
496 | ret = fcntl(lks->fd, F_SETFD, FD_CLOEXEC); | |
497 | if (ret < 0) { | |
498 | perror("fcntl session fd"); | |
499 | } | |
500 | ||
8e68d1c8 DG |
501 | ret = asprintf(&lks->pathname, "%s/%s_%d", |
502 | channel->pathname, channel->channel->name, channel->stream_count); | |
8c0faa1d DG |
503 | if (ret < 0) { |
504 | perror("asprintf kernel create stream"); | |
505 | goto error; | |
506 | } | |
8c0faa1d | 507 | |
54012638 | 508 | /* Add stream to channe stream list */ |
8c0faa1d DG |
509 | cds_list_add(&lks->list, &channel->stream_list.head); |
510 | channel->stream_count++; | |
8c0faa1d | 511 | |
54012638 DG |
512 | DBG("Kernel stream %d created (fd: %d, state: %d, path: %s)", |
513 | channel->stream_count, lks->fd, lks->state, lks->pathname); | |
514 | } | |
8c0faa1d DG |
515 | |
516 | return channel->stream_count; | |
517 | ||
518 | error: | |
54012638 | 519 | return -1; |
8c0faa1d DG |
520 | } |
521 | ||
522 | /* | |
050349bb | 523 | * Open the metadata stream and set it to the kernel session. |
8c0faa1d | 524 | */ |
f3ed775e | 525 | int kernel_open_metadata_stream(struct ltt_kernel_session *session) |
8c0faa1d DG |
526 | { |
527 | int ret; | |
528 | ||
529 | ret = kernctl_create_stream(session->metadata->fd); | |
530 | if (ret < 0) { | |
531 | perror("kernel create metadata stream"); | |
8c0faa1d DG |
532 | goto error; |
533 | } | |
534 | ||
535 | DBG("Kernel metadata stream created (fd: %d)", ret); | |
536 | session->metadata_stream_fd = ret; | |
7b395890 DG |
537 | /* Prevent fd duplication after execlp() */ |
538 | ret = fcntl(session->metadata_stream_fd, F_SETFD, FD_CLOEXEC); | |
539 | if (ret < 0) { | |
540 | perror("fcntl session fd"); | |
541 | } | |
aaf26714 DG |
542 | |
543 | return 0; | |
544 | ||
545 | error: | |
54012638 | 546 | return -1; |
aaf26714 | 547 | } |
2ef84c95 DG |
548 | |
549 | /* | |
9f19cc17 | 550 | * Get the event list from the kernel tracer and return the number of elements. |
2ef84c95 | 551 | */ |
9f19cc17 | 552 | ssize_t kernel_list_events(int tracer_fd, struct lttng_event **events) |
2ef84c95 | 553 | { |
9f19cc17 DG |
554 | int fd, pos; |
555 | char *event; | |
556 | size_t nbmem, count = 0; | |
2ef84c95 DG |
557 | ssize_t size; |
558 | FILE *fp; | |
9f19cc17 | 559 | struct lttng_event *elist; |
2ef84c95 DG |
560 | |
561 | fd = kernctl_tracepoint_list(tracer_fd); | |
562 | if (fd < 0) { | |
563 | perror("kernel tracepoint list"); | |
564 | goto error; | |
565 | } | |
566 | ||
567 | fp = fdopen(fd, "r"); | |
568 | if (fp == NULL) { | |
569 | perror("kernel tracepoint list fdopen"); | |
61b73b12 | 570 | goto error_fp; |
2ef84c95 DG |
571 | } |
572 | ||
573 | /* | |
574 | * Init memory size counter | |
575 | * See kernel-ctl.h for explanation of this value | |
576 | */ | |
6725fe19 | 577 | nbmem = KERNEL_EVENT_INIT_LIST_SIZE; |
ba7f0ae5 | 578 | elist = zmalloc(sizeof(struct lttng_event) * nbmem); |
2ef84c95 | 579 | |
9f19cc17 | 580 | while ((size = fscanf(fp, "event { name = %m[^;]; };%n\n", &event, &pos)) == 1) { |
6725fe19 | 581 | if (count >= nbmem) { |
ced2f820 | 582 | DBG("Reallocating event list from %zu to %zu bytes", nbmem, |
6725fe19 DG |
583 | nbmem * 2); |
584 | /* Double the size */ | |
585 | nbmem <<= 1; | |
2f221590 | 586 | elist = realloc(elist, nbmem * sizeof(struct lttng_event)); |
9f19cc17 | 587 | if (elist == NULL) { |
2ef84c95 | 588 | perror("realloc list events"); |
61b73b12 MD |
589 | count = -ENOMEM; |
590 | goto end; | |
2ef84c95 DG |
591 | } |
592 | } | |
99497cd0 MD |
593 | strncpy(elist[count].name, event, LTTNG_SYMBOL_NAME_LEN); |
594 | elist[count].name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0'; | |
67b9d018 | 595 | elist[count].enabled = -1; |
9f19cc17 | 596 | count++; |
2ef84c95 DG |
597 | } |
598 | ||
9f19cc17 | 599 | *events = elist; |
ced2f820 | 600 | DBG("Kernel list events done (%zu events)", count); |
61b73b12 MD |
601 | end: |
602 | fclose(fp); /* closes both fp and fd */ | |
9f19cc17 | 603 | return count; |
2ef84c95 | 604 | |
61b73b12 MD |
605 | error_fp: |
606 | close(fd); | |
2ef84c95 DG |
607 | error: |
608 | return -1; | |
609 | } | |
096102bd DG |
610 | |
611 | /* | |
612 | * Get kernel version and validate it. | |
613 | */ | |
614 | int kernel_validate_version(int tracer_fd) | |
615 | { | |
616 | int ret; | |
617 | struct lttng_kernel_tracer_version version; | |
618 | ||
619 | ret = kernctl_tracer_version(tracer_fd, &version); | |
620 | if (ret < 0) { | |
621 | ERR("Failed at getting the lttng-modules version"); | |
622 | goto error; | |
623 | } | |
624 | ||
625 | /* Validate version */ | |
626 | if (version.version > KERN_MODULES_VERSION) { | |
627 | goto error_version; | |
096102bd DG |
628 | } |
629 | ||
5df0f285 | 630 | DBG2("Kernel tracer version validated (major version %d)", version.version); |
096102bd DG |
631 | return 0; |
632 | ||
633 | error_version: | |
5df0f285 DG |
634 | ERR("Kernel major version %d is not compatible (supporting <= %d)", |
635 | version.version, KERN_MODULES_VERSION) | |
096102bd DG |
636 | ret = -1; |
637 | ||
638 | error: | |
639 | return ret; | |
640 | } | |
335a95b7 MD |
641 | |
642 | /* | |
643 | * Kernel work-arounds called at the start of sessiond main(). | |
644 | */ | |
645 | int init_kernel_workarounds(void) | |
646 | { | |
8936c33a | 647 | int ret; |
335a95b7 MD |
648 | FILE *fp; |
649 | ||
650 | /* | |
651 | * boot_id needs to be read once before being used concurrently | |
652 | * to deal with a Linux kernel race. A fix is proposed for | |
653 | * upstream, but the work-around is needed for older kernels. | |
654 | */ | |
655 | fp = fopen("/proc/sys/kernel/random/boot_id", "r"); | |
656 | if (!fp) { | |
657 | goto end_boot_id; | |
658 | } | |
659 | while (!feof(fp)) { | |
660 | char buf[37] = ""; | |
661 | ||
8936c33a DG |
662 | ret = fread(buf, 1, sizeof(buf), fp); |
663 | if (ret < 0) { | |
664 | /* Ignore error, we don't really care */ | |
665 | } | |
335a95b7 MD |
666 | } |
667 | fclose(fp); | |
668 | end_boot_id: | |
669 | ||
670 | return 0; | |
671 | } |