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 | ||
8c0faa1d | 18 | #define _GNU_SOURCE |
20fe2104 | 19 | #include <errno.h> |
7b395890 | 20 | #include <fcntl.h> |
20fe2104 DG |
21 | #include <stdlib.h> |
22 | #include <stdio.h> | |
f34daff7 | 23 | #include <string.h> |
8c0faa1d | 24 | #include <unistd.h> |
20fe2104 | 25 | |
990570ed | 26 | #include <common/common.h> |
db758600 | 27 | #include <common/kernel-ctl/kernel-ctl.h> |
1e307fab | 28 | |
4771f025 | 29 | #include "kernel.h" |
096102bd | 30 | #include "kern-modules.h" |
20fe2104 | 31 | |
d65106b1 | 32 | /* |
050349bb | 33 | * Add context on a kernel channel. |
d65106b1 DG |
34 | */ |
35 | int kernel_add_channel_context(struct ltt_kernel_channel *chan, | |
36 | struct lttng_kernel_context *ctx) | |
37 | { | |
38 | int ret; | |
39 | ||
40 | DBG("Adding context to channel %s", chan->channel->name); | |
41 | ret = kernctl_add_context(chan->fd, ctx); | |
42 | if (ret < 0) { | |
b579acd9 | 43 | if (errno != EEXIST) { |
df0f840b | 44 | PERROR("add context ioctl"); |
b579acd9 DG |
45 | } else { |
46 | /* If EEXIST, we just ignore the error */ | |
47 | ret = 0; | |
48 | } | |
d65106b1 DG |
49 | goto error; |
50 | } | |
51 | ||
ba7f0ae5 | 52 | chan->ctx = zmalloc(sizeof(struct lttng_kernel_context)); |
d65106b1 | 53 | if (chan->ctx == NULL) { |
df0f840b | 54 | PERROR("zmalloc event context"); |
d65106b1 DG |
55 | goto error; |
56 | } | |
57 | ||
58 | memcpy(chan->ctx, ctx, sizeof(struct lttng_kernel_context)); | |
59 | ||
60 | return 0; | |
61 | ||
62 | error: | |
63 | return ret; | |
64 | } | |
65 | ||
66 | /* | |
050349bb | 67 | * Add context on a kernel event. |
d65106b1 DG |
68 | */ |
69 | int kernel_add_event_context(struct ltt_kernel_event *event, | |
70 | struct lttng_kernel_context *ctx) | |
71 | { | |
72 | int ret; | |
73 | ||
74 | DBG("Adding context to event %s", event->event->name); | |
75 | ret = kernctl_add_context(event->fd, ctx); | |
76 | if (ret < 0) { | |
df0f840b | 77 | PERROR("add context ioctl"); |
d65106b1 DG |
78 | goto error; |
79 | } | |
80 | ||
ba7f0ae5 | 81 | event->ctx = zmalloc(sizeof(struct lttng_kernel_context)); |
d65106b1 | 82 | if (event->ctx == NULL) { |
df0f840b | 83 | PERROR("zmalloc event context"); |
d65106b1 DG |
84 | goto error; |
85 | } | |
86 | ||
87 | memcpy(event->ctx, ctx, sizeof(struct lttng_kernel_context)); | |
88 | ||
89 | return 0; | |
90 | ||
91 | error: | |
92 | return ret; | |
93 | } | |
94 | ||
20fe2104 | 95 | /* |
050349bb DG |
96 | * Create a new kernel session, register it to the kernel tracer and add it to |
97 | * the session daemon session. | |
20fe2104 | 98 | */ |
8c0faa1d | 99 | int kernel_create_session(struct ltt_session *session, int tracer_fd) |
20fe2104 DG |
100 | { |
101 | int ret; | |
102 | struct ltt_kernel_session *lks; | |
103 | ||
54012638 | 104 | /* Allocate data structure */ |
f9815039 | 105 | lks = trace_kernel_create_session(session->path); |
20fe2104 | 106 | if (lks == NULL) { |
54012638 | 107 | ret = -1; |
20fe2104 DG |
108 | goto error; |
109 | } | |
110 | ||
54012638 | 111 | /* Kernel tracer session creation */ |
20fe2104 DG |
112 | ret = kernctl_create_session(tracer_fd); |
113 | if (ret < 0) { | |
df0f840b | 114 | PERROR("ioctl kernel create session"); |
20fe2104 DG |
115 | goto error; |
116 | } | |
117 | ||
20fe2104 | 118 | lks->fd = ret; |
7b395890 DG |
119 | /* Prevent fd duplication after execlp() */ |
120 | ret = fcntl(lks->fd, F_SETFD, FD_CLOEXEC); | |
121 | if (ret < 0) { | |
df0f840b | 122 | PERROR("fcntl session fd"); |
7b395890 DG |
123 | } |
124 | ||
3bd1e081 | 125 | lks->consumer_fds_sent = 0; |
8c0faa1d | 126 | session->kernel_session = lks; |
8c0faa1d DG |
127 | |
128 | DBG("Kernel session created (fd: %d)", lks->fd); | |
20fe2104 DG |
129 | |
130 | return 0; | |
131 | ||
132 | error: | |
133 | return ret; | |
134 | } | |
135 | ||
136 | /* | |
050349bb DG |
137 | * Create a kernel channel, register it to the kernel tracer and add it to the |
138 | * kernel session. | |
20fe2104 | 139 | */ |
050349bb DG |
140 | int kernel_create_channel(struct ltt_kernel_session *session, |
141 | struct lttng_channel *chan, char *path) | |
20fe2104 DG |
142 | { |
143 | int ret; | |
144 | struct ltt_kernel_channel *lkc; | |
20fe2104 | 145 | |
54012638 | 146 | /* Allocate kernel channel */ |
62499ad6 | 147 | lkc = trace_kernel_create_channel(chan, path); |
54012638 | 148 | if (lkc == NULL) { |
20fe2104 DG |
149 | goto error; |
150 | } | |
151 | ||
54012638 | 152 | /* Kernel tracer channel creation */ |
f3ed775e | 153 | ret = kernctl_create_channel(session->fd, &lkc->channel->attr); |
20fe2104 | 154 | if (ret < 0) { |
df0f840b | 155 | PERROR("ioctl kernel create channel"); |
20fe2104 DG |
156 | goto error; |
157 | } | |
158 | ||
54012638 | 159 | /* Setup the channel fd */ |
20fe2104 | 160 | lkc->fd = ret; |
7b395890 DG |
161 | /* Prevent fd duplication after execlp() */ |
162 | ret = fcntl(lkc->fd, F_SETFD, FD_CLOEXEC); | |
163 | if (ret < 0) { | |
df0f840b | 164 | PERROR("fcntl session fd"); |
7b395890 DG |
165 | } |
166 | ||
54012638 | 167 | /* Add channel to session */ |
8c0faa1d DG |
168 | cds_list_add(&lkc->list, &session->channel_list.head); |
169 | session->channel_count++; | |
20fe2104 | 170 | |
f3ed775e DG |
171 | DBG("Kernel channel %s created (fd: %d and path: %s)", |
172 | lkc->channel->name, lkc->fd, lkc->pathname); | |
20fe2104 DG |
173 | |
174 | return 0; | |
175 | ||
176 | error: | |
54012638 | 177 | return -1; |
20fe2104 | 178 | } |
f34daff7 DG |
179 | |
180 | /* | |
050349bb DG |
181 | * Create a kernel event, enable it to the kernel tracer and add it to the |
182 | * channel event list of the kernel session. | |
f34daff7 | 183 | */ |
050349bb DG |
184 | int kernel_create_event(struct lttng_event *ev, |
185 | struct ltt_kernel_channel *channel) | |
f34daff7 DG |
186 | { |
187 | int ret; | |
188 | struct ltt_kernel_event *event; | |
f34daff7 | 189 | |
62499ad6 | 190 | event = trace_kernel_create_event(ev); |
54012638 | 191 | if (event == NULL) { |
d87bfb32 | 192 | ret = -1; |
f34daff7 DG |
193 | goto error; |
194 | } | |
195 | ||
f3ed775e DG |
196 | ret = kernctl_create_event(channel->fd, event->event); |
197 | if (ret < 0) { | |
d87bfb32 DG |
198 | if (errno != EEXIST) { |
199 | PERROR("create event ioctl"); | |
200 | } | |
201 | ret = -errno; | |
e953ef25 | 202 | goto free_event; |
8c0faa1d | 203 | } |
f34daff7 | 204 | |
5f822d0a | 205 | /* |
2c425ff7 | 206 | * LTTNG_KERNEL_SYSCALL event creation will return 0 on success. |
5f822d0a DG |
207 | */ |
208 | if (ret == 0 && event->event->instrumentation == LTTNG_KERNEL_SYSCALL) { | |
209 | DBG2("Kernel event syscall creation success"); | |
87eb4ab8 MD |
210 | /* |
211 | * We use fd == -1 to ensure that we never trigger a close of fd | |
212 | * 0. | |
213 | */ | |
214 | event->fd = -1; | |
2c425ff7 | 215 | goto add_list; |
5f822d0a DG |
216 | } |
217 | ||
f3ed775e | 218 | event->fd = ret; |
7b395890 DG |
219 | /* Prevent fd duplication after execlp() */ |
220 | ret = fcntl(event->fd, F_SETFD, FD_CLOEXEC); | |
221 | if (ret < 0) { | |
df0f840b | 222 | PERROR("fcntl session fd"); |
7b395890 DG |
223 | } |
224 | ||
2c425ff7 | 225 | add_list: |
f3ed775e DG |
226 | /* Add event to event list */ |
227 | cds_list_add(&event->list, &channel->events_list.head); | |
cbbbb275 DG |
228 | channel->event_count++; |
229 | ||
e953ef25 DG |
230 | DBG("Event %s created (fd: %d)", ev->name, event->fd); |
231 | ||
232 | return 0; | |
233 | ||
234 | free_event: | |
235 | free(event); | |
236 | error: | |
d87bfb32 | 237 | return ret; |
e953ef25 DG |
238 | } |
239 | ||
26cc6b4e | 240 | /* |
050349bb | 241 | * Disable a kernel channel. |
26cc6b4e DG |
242 | */ |
243 | int kernel_disable_channel(struct ltt_kernel_channel *chan) | |
244 | { | |
245 | int ret; | |
246 | ||
247 | ret = kernctl_disable(chan->fd); | |
248 | if (ret < 0) { | |
df0f840b | 249 | PERROR("disable chan ioctl"); |
26cc6b4e DG |
250 | ret = errno; |
251 | goto error; | |
252 | } | |
253 | ||
254 | chan->enabled = 0; | |
255 | DBG("Kernel channel %s disabled (fd: %d)", chan->channel->name, chan->fd); | |
256 | ||
257 | return 0; | |
258 | ||
259 | error: | |
260 | return ret; | |
261 | } | |
262 | ||
d36b8583 | 263 | /* |
050349bb | 264 | * Enable a kernel channel. |
d36b8583 DG |
265 | */ |
266 | int kernel_enable_channel(struct ltt_kernel_channel *chan) | |
267 | { | |
268 | int ret; | |
269 | ||
270 | ret = kernctl_enable(chan->fd); | |
54d01ffb | 271 | if (ret < 0 && errno != EEXIST) { |
df0f840b | 272 | PERROR("Enable kernel chan"); |
d36b8583 DG |
273 | goto error; |
274 | } | |
275 | ||
276 | chan->enabled = 1; | |
277 | DBG("Kernel channel %s enabled (fd: %d)", chan->channel->name, chan->fd); | |
278 | ||
279 | return 0; | |
280 | ||
281 | error: | |
282 | return ret; | |
283 | } | |
284 | ||
19e70852 | 285 | /* |
050349bb | 286 | * Enable a kernel event. |
19e70852 DG |
287 | */ |
288 | int kernel_enable_event(struct ltt_kernel_event *event) | |
289 | { | |
290 | int ret; | |
291 | ||
292 | ret = kernctl_enable(event->fd); | |
54d01ffb | 293 | if (ret < 0 && errno != EEXIST) { |
df0f840b | 294 | PERROR("enable kernel event"); |
19e70852 DG |
295 | goto error; |
296 | } | |
297 | ||
298 | event->enabled = 1; | |
299 | DBG("Kernel event %s enabled (fd: %d)", event->event->name, event->fd); | |
300 | ||
301 | return 0; | |
302 | ||
303 | error: | |
d36b8583 | 304 | return ret; |
19e70852 DG |
305 | } |
306 | ||
e953ef25 | 307 | /* |
050349bb | 308 | * Disable a kernel event. |
e953ef25 | 309 | */ |
19e70852 | 310 | int kernel_disable_event(struct ltt_kernel_event *event) |
e953ef25 DG |
311 | { |
312 | int ret; | |
19e70852 DG |
313 | |
314 | ret = kernctl_disable(event->fd); | |
54d01ffb | 315 | if (ret < 0 && errno != EEXIST) { |
df0f840b | 316 | PERROR("disable kernel event"); |
19e70852 | 317 | goto error; |
e953ef25 | 318 | } |
f3ed775e | 319 | |
19e70852 DG |
320 | event->enabled = 0; |
321 | DBG("Kernel event %s disabled (fd: %d)", event->event->name, event->fd); | |
322 | ||
f34daff7 DG |
323 | return 0; |
324 | ||
325 | error: | |
d36b8583 | 326 | return ret; |
f34daff7 | 327 | } |
aaf26714 DG |
328 | |
329 | /* | |
050349bb DG |
330 | * Create kernel metadata, open from the kernel tracer and add it to the |
331 | * kernel session. | |
aaf26714 | 332 | */ |
58a97671 | 333 | int kernel_open_metadata(struct ltt_kernel_session *session, char *path) |
aaf26714 DG |
334 | { |
335 | int ret; | |
336 | struct ltt_kernel_metadata *lkm; | |
aaf26714 | 337 | |
54012638 | 338 | /* Allocate kernel metadata */ |
62499ad6 | 339 | lkm = trace_kernel_create_metadata(path); |
54012638 | 340 | if (lkm == NULL) { |
aaf26714 DG |
341 | goto error; |
342 | } | |
343 | ||
54012638 | 344 | /* Kernel tracer metadata creation */ |
f3ed775e | 345 | ret = kernctl_open_metadata(session->fd, &lkm->conf->attr); |
aaf26714 DG |
346 | if (ret < 0) { |
347 | goto error; | |
348 | } | |
349 | ||
8c0faa1d | 350 | lkm->fd = ret; |
7b395890 DG |
351 | /* Prevent fd duplication after execlp() */ |
352 | ret = fcntl(lkm->fd, F_SETFD, FD_CLOEXEC); | |
353 | if (ret < 0) { | |
df0f840b | 354 | PERROR("fcntl session fd"); |
7b395890 DG |
355 | } |
356 | ||
aaf26714 | 357 | session->metadata = lkm; |
8c0faa1d | 358 | |
54012638 | 359 | DBG("Kernel metadata opened (fd: %d and path: %s)", lkm->fd, lkm->pathname); |
8c0faa1d DG |
360 | |
361 | return 0; | |
362 | ||
363 | error: | |
54012638 | 364 | return -1; |
8c0faa1d DG |
365 | } |
366 | ||
367 | /* | |
050349bb | 368 | * Start tracing session. |
8c0faa1d DG |
369 | */ |
370 | int kernel_start_session(struct ltt_kernel_session *session) | |
371 | { | |
372 | int ret; | |
373 | ||
374 | ret = kernctl_start_session(session->fd); | |
375 | if (ret < 0) { | |
df0f840b | 376 | PERROR("ioctl start session"); |
8c0faa1d DG |
377 | goto error; |
378 | } | |
379 | ||
380 | DBG("Kernel session started"); | |
381 | ||
382 | return 0; | |
383 | ||
384 | error: | |
385 | return ret; | |
386 | } | |
387 | ||
f3ed775e | 388 | /* |
050349bb | 389 | * Make a kernel wait to make sure in-flight probe have completed. |
f3ed775e DG |
390 | */ |
391 | void kernel_wait_quiescent(int fd) | |
392 | { | |
393 | int ret; | |
394 | ||
395 | DBG("Kernel quiescent wait on %d", fd); | |
396 | ||
397 | ret = kernctl_wait_quiescent(fd); | |
398 | if (ret < 0) { | |
df0f840b | 399 | PERROR("wait quiescent ioctl"); |
f3ed775e DG |
400 | ERR("Kernel quiescent wait failed"); |
401 | } | |
402 | } | |
403 | ||
d0254c7c | 404 | /* |
050349bb | 405 | * Kernel calibrate |
d0254c7c MD |
406 | */ |
407 | int kernel_calibrate(int fd, struct lttng_kernel_calibrate *calibrate) | |
408 | { | |
409 | int ret; | |
410 | ||
411 | ret = kernctl_calibrate(fd, calibrate); | |
412 | if (ret < 0) { | |
df0f840b | 413 | PERROR("calibrate ioctl"); |
d0254c7c MD |
414 | return -1; |
415 | } | |
416 | ||
417 | return 0; | |
418 | } | |
419 | ||
420 | ||
f3ed775e | 421 | /* |
f3ed775e DG |
422 | * Force flush buffer of metadata. |
423 | */ | |
424 | int kernel_metadata_flush_buffer(int fd) | |
425 | { | |
426 | int ret; | |
427 | ||
428 | ret = kernctl_buffer_flush(fd); | |
429 | if (ret < 0) { | |
430 | ERR("Fail to flush metadata buffers %d (ret: %d", fd, ret); | |
431 | } | |
432 | ||
433 | return 0; | |
434 | } | |
435 | ||
436 | /* | |
050349bb | 437 | * Force flush buffer for channel. |
f3ed775e DG |
438 | */ |
439 | int kernel_flush_buffer(struct ltt_kernel_channel *channel) | |
440 | { | |
441 | int ret; | |
442 | struct ltt_kernel_stream *stream; | |
443 | ||
444 | DBG("Flush buffer for channel %s", channel->channel->name); | |
445 | ||
446 | cds_list_for_each_entry(stream, &channel->stream_list.head, list) { | |
447 | DBG("Flushing channel stream %d", stream->fd); | |
448 | ret = kernctl_buffer_flush(stream->fd); | |
449 | if (ret < 0) { | |
df0f840b | 450 | PERROR("ioctl"); |
f3ed775e DG |
451 | ERR("Fail to flush buffer for stream %d (ret: %d)", |
452 | stream->fd, ret); | |
453 | } | |
454 | } | |
455 | ||
456 | return 0; | |
457 | } | |
458 | ||
8c0faa1d | 459 | /* |
050349bb | 460 | * Stop tracing session. |
8c0faa1d DG |
461 | */ |
462 | int kernel_stop_session(struct ltt_kernel_session *session) | |
463 | { | |
464 | int ret; | |
465 | ||
466 | ret = kernctl_stop_session(session->fd); | |
467 | if (ret < 0) { | |
468 | goto error; | |
469 | } | |
470 | ||
471 | DBG("Kernel session stopped"); | |
472 | ||
473 | return 0; | |
474 | ||
475 | error: | |
476 | return ret; | |
477 | } | |
478 | ||
479 | /* | |
050349bb DG |
480 | * Open stream of channel, register it to the kernel tracer and add it |
481 | * to the stream list of the channel. | |
8c0faa1d | 482 | * |
050349bb | 483 | * Return the number of created stream. Else, a negative value. |
8c0faa1d | 484 | */ |
f3ed775e | 485 | int kernel_open_channel_stream(struct ltt_kernel_channel *channel) |
8c0faa1d DG |
486 | { |
487 | int ret; | |
488 | struct ltt_kernel_stream *lks; | |
489 | ||
5a47c6a2 | 490 | while ((ret = kernctl_create_stream(channel->fd)) >= 0) { |
62499ad6 | 491 | lks = trace_kernel_create_stream(); |
8c0faa1d | 492 | if (lks == NULL) { |
799e2c4f MD |
493 | ret = close(ret); |
494 | if (ret) { | |
495 | PERROR("close"); | |
496 | } | |
8c0faa1d DG |
497 | goto error; |
498 | } | |
499 | ||
500 | lks->fd = ret; | |
7b395890 DG |
501 | /* Prevent fd duplication after execlp() */ |
502 | ret = fcntl(lks->fd, F_SETFD, FD_CLOEXEC); | |
503 | if (ret < 0) { | |
df0f840b | 504 | PERROR("fcntl session fd"); |
7b395890 DG |
505 | } |
506 | ||
8e68d1c8 DG |
507 | ret = asprintf(&lks->pathname, "%s/%s_%d", |
508 | channel->pathname, channel->channel->name, channel->stream_count); | |
8c0faa1d | 509 | if (ret < 0) { |
df0f840b | 510 | PERROR("asprintf kernel create stream"); |
8c0faa1d DG |
511 | goto error; |
512 | } | |
8c0faa1d | 513 | |
54012638 | 514 | /* Add stream to channe stream list */ |
8c0faa1d DG |
515 | cds_list_add(&lks->list, &channel->stream_list.head); |
516 | channel->stream_count++; | |
8c0faa1d | 517 | |
54012638 DG |
518 | DBG("Kernel stream %d created (fd: %d, state: %d, path: %s)", |
519 | channel->stream_count, lks->fd, lks->state, lks->pathname); | |
520 | } | |
8c0faa1d DG |
521 | |
522 | return channel->stream_count; | |
523 | ||
524 | error: | |
54012638 | 525 | return -1; |
8c0faa1d DG |
526 | } |
527 | ||
528 | /* | |
050349bb | 529 | * Open the metadata stream and set it to the kernel session. |
8c0faa1d | 530 | */ |
f3ed775e | 531 | int kernel_open_metadata_stream(struct ltt_kernel_session *session) |
8c0faa1d DG |
532 | { |
533 | int ret; | |
534 | ||
535 | ret = kernctl_create_stream(session->metadata->fd); | |
536 | if (ret < 0) { | |
df0f840b | 537 | PERROR("kernel create metadata stream"); |
8c0faa1d DG |
538 | goto error; |
539 | } | |
540 | ||
541 | DBG("Kernel metadata stream created (fd: %d)", ret); | |
542 | session->metadata_stream_fd = ret; | |
7b395890 DG |
543 | /* Prevent fd duplication after execlp() */ |
544 | ret = fcntl(session->metadata_stream_fd, F_SETFD, FD_CLOEXEC); | |
545 | if (ret < 0) { | |
df0f840b | 546 | PERROR("fcntl session fd"); |
7b395890 | 547 | } |
aaf26714 DG |
548 | |
549 | return 0; | |
550 | ||
551 | error: | |
54012638 | 552 | return -1; |
aaf26714 | 553 | } |
2ef84c95 DG |
554 | |
555 | /* | |
9f19cc17 | 556 | * Get the event list from the kernel tracer and return the number of elements. |
2ef84c95 | 557 | */ |
9f19cc17 | 558 | ssize_t kernel_list_events(int tracer_fd, struct lttng_event **events) |
2ef84c95 | 559 | { |
799e2c4f | 560 | int fd, pos, ret; |
9f19cc17 DG |
561 | char *event; |
562 | size_t nbmem, count = 0; | |
2ef84c95 DG |
563 | ssize_t size; |
564 | FILE *fp; | |
9f19cc17 | 565 | struct lttng_event *elist; |
2ef84c95 DG |
566 | |
567 | fd = kernctl_tracepoint_list(tracer_fd); | |
568 | if (fd < 0) { | |
df0f840b | 569 | PERROR("kernel tracepoint list"); |
2ef84c95 DG |
570 | goto error; |
571 | } | |
572 | ||
573 | fp = fdopen(fd, "r"); | |
574 | if (fp == NULL) { | |
df0f840b | 575 | PERROR("kernel tracepoint list fdopen"); |
61b73b12 | 576 | goto error_fp; |
2ef84c95 DG |
577 | } |
578 | ||
579 | /* | |
580 | * Init memory size counter | |
581 | * See kernel-ctl.h for explanation of this value | |
582 | */ | |
6725fe19 | 583 | nbmem = KERNEL_EVENT_INIT_LIST_SIZE; |
ba7f0ae5 | 584 | elist = zmalloc(sizeof(struct lttng_event) * nbmem); |
3b870559 MD |
585 | if (elist == NULL) { |
586 | PERROR("alloc list events"); | |
587 | count = -ENOMEM; | |
588 | goto end; | |
589 | } | |
2ef84c95 | 590 | |
9f19cc17 | 591 | while ((size = fscanf(fp, "event { name = %m[^;]; };%n\n", &event, &pos)) == 1) { |
6725fe19 | 592 | if (count >= nbmem) { |
3b870559 MD |
593 | struct lttng_event *new_elist; |
594 | ||
ced2f820 | 595 | DBG("Reallocating event list from %zu to %zu bytes", nbmem, |
6725fe19 DG |
596 | nbmem * 2); |
597 | /* Double the size */ | |
598 | nbmem <<= 1; | |
3b870559 MD |
599 | new_elist = realloc(elist, nbmem * sizeof(struct lttng_event)); |
600 | if (new_elist == NULL) { | |
df0f840b | 601 | PERROR("realloc list events"); |
3b870559 MD |
602 | free(event); |
603 | free(elist); | |
61b73b12 MD |
604 | count = -ENOMEM; |
605 | goto end; | |
2ef84c95 | 606 | } |
3b870559 | 607 | elist = new_elist; |
2ef84c95 | 608 | } |
99497cd0 MD |
609 | strncpy(elist[count].name, event, LTTNG_SYMBOL_NAME_LEN); |
610 | elist[count].name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0'; | |
67b9d018 | 611 | elist[count].enabled = -1; |
9f19cc17 | 612 | count++; |
3b870559 | 613 | free(event); |
2ef84c95 DG |
614 | } |
615 | ||
9f19cc17 | 616 | *events = elist; |
ced2f820 | 617 | DBG("Kernel list events done (%zu events)", count); |
61b73b12 | 618 | end: |
799e2c4f MD |
619 | ret = fclose(fp); /* closes both fp and fd */ |
620 | if (ret) { | |
621 | PERROR("fclose"); | |
622 | } | |
9f19cc17 | 623 | return count; |
2ef84c95 | 624 | |
61b73b12 | 625 | error_fp: |
799e2c4f MD |
626 | ret = close(fd); |
627 | if (ret) { | |
628 | PERROR("close"); | |
629 | } | |
2ef84c95 DG |
630 | error: |
631 | return -1; | |
632 | } | |
096102bd DG |
633 | |
634 | /* | |
635 | * Get kernel version and validate it. | |
636 | */ | |
637 | int kernel_validate_version(int tracer_fd) | |
638 | { | |
639 | int ret; | |
640 | struct lttng_kernel_tracer_version version; | |
641 | ||
642 | ret = kernctl_tracer_version(tracer_fd, &version); | |
643 | if (ret < 0) { | |
644 | ERR("Failed at getting the lttng-modules version"); | |
645 | goto error; | |
646 | } | |
647 | ||
648 | /* Validate version */ | |
a62a6556 MD |
649 | if (version.major != KERN_MODULES_PRE_MAJOR |
650 | && version.major != KERN_MODULES_MAJOR) { | |
096102bd | 651 | goto error_version; |
096102bd DG |
652 | } |
653 | ||
a62a6556 | 654 | DBG2("Kernel tracer version validated (major version %d)", version.major); |
096102bd DG |
655 | return 0; |
656 | ||
657 | error_version: | |
5df0f285 | 658 | ERR("Kernel major version %d is not compatible (supporting <= %d)", |
a62a6556 | 659 | version.major, KERN_MODULES_MAJOR) |
096102bd DG |
660 | ret = -1; |
661 | ||
662 | error: | |
663 | return ret; | |
664 | } | |
335a95b7 MD |
665 | |
666 | /* | |
667 | * Kernel work-arounds called at the start of sessiond main(). | |
668 | */ | |
669 | int init_kernel_workarounds(void) | |
670 | { | |
8936c33a | 671 | int ret; |
335a95b7 MD |
672 | FILE *fp; |
673 | ||
674 | /* | |
675 | * boot_id needs to be read once before being used concurrently | |
676 | * to deal with a Linux kernel race. A fix is proposed for | |
677 | * upstream, but the work-around is needed for older kernels. | |
678 | */ | |
679 | fp = fopen("/proc/sys/kernel/random/boot_id", "r"); | |
680 | if (!fp) { | |
681 | goto end_boot_id; | |
682 | } | |
683 | while (!feof(fp)) { | |
684 | char buf[37] = ""; | |
685 | ||
8936c33a DG |
686 | ret = fread(buf, 1, sizeof(buf), fp); |
687 | if (ret < 0) { | |
688 | /* Ignore error, we don't really care */ | |
689 | } | |
335a95b7 | 690 | } |
799e2c4f MD |
691 | ret = fclose(fp); |
692 | if (ret) { | |
693 | PERROR("fclose"); | |
694 | } | |
335a95b7 | 695 | end_boot_id: |
335a95b7 MD |
696 | return 0; |
697 | } |