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 | 44 | if (errno != EEXIST) { |
df0f840b | 45 | PERROR("add context ioctl"); |
b579acd9 DG |
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) { |
df0f840b | 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) { | |
df0f840b | 78 | PERROR("add context ioctl"); |
d65106b1 DG |
79 | goto error; |
80 | } | |
81 | ||
ba7f0ae5 | 82 | event->ctx = zmalloc(sizeof(struct lttng_kernel_context)); |
d65106b1 | 83 | if (event->ctx == NULL) { |
df0f840b | 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) { | |
df0f840b | 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) { | |
df0f840b | 123 | PERROR("fcntl session fd"); |
7b395890 DG |
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) { |
df0f840b | 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) { | |
df0f840b | 165 | PERROR("fcntl session fd"); |
7b395890 DG |
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 | 206 | /* |
2c425ff7 | 207 | * LTTNG_KERNEL_SYSCALL event creation will return 0 on success. |
5f822d0a DG |
208 | */ |
209 | if (ret == 0 && event->event->instrumentation == LTTNG_KERNEL_SYSCALL) { | |
210 | DBG2("Kernel event syscall creation success"); | |
87eb4ab8 MD |
211 | /* |
212 | * We use fd == -1 to ensure that we never trigger a close of fd | |
213 | * 0. | |
214 | */ | |
215 | event->fd = -1; | |
2c425ff7 | 216 | goto add_list; |
5f822d0a DG |
217 | } |
218 | ||
f3ed775e | 219 | event->fd = ret; |
7b395890 DG |
220 | /* Prevent fd duplication after execlp() */ |
221 | ret = fcntl(event->fd, F_SETFD, FD_CLOEXEC); | |
222 | if (ret < 0) { | |
df0f840b | 223 | PERROR("fcntl session fd"); |
7b395890 DG |
224 | } |
225 | ||
2c425ff7 | 226 | add_list: |
f3ed775e DG |
227 | /* Add event to event list */ |
228 | cds_list_add(&event->list, &channel->events_list.head); | |
cbbbb275 DG |
229 | channel->event_count++; |
230 | ||
e953ef25 DG |
231 | DBG("Event %s created (fd: %d)", ev->name, event->fd); |
232 | ||
233 | return 0; | |
234 | ||
235 | free_event: | |
236 | free(event); | |
237 | error: | |
d87bfb32 | 238 | return ret; |
e953ef25 DG |
239 | } |
240 | ||
26cc6b4e | 241 | /* |
050349bb | 242 | * Disable a kernel channel. |
26cc6b4e DG |
243 | */ |
244 | int kernel_disable_channel(struct ltt_kernel_channel *chan) | |
245 | { | |
246 | int ret; | |
247 | ||
248 | ret = kernctl_disable(chan->fd); | |
249 | if (ret < 0) { | |
df0f840b | 250 | PERROR("disable chan ioctl"); |
26cc6b4e DG |
251 | ret = errno; |
252 | goto error; | |
253 | } | |
254 | ||
255 | chan->enabled = 0; | |
256 | DBG("Kernel channel %s disabled (fd: %d)", chan->channel->name, chan->fd); | |
257 | ||
258 | return 0; | |
259 | ||
260 | error: | |
261 | return ret; | |
262 | } | |
263 | ||
d36b8583 | 264 | /* |
050349bb | 265 | * Enable a kernel channel. |
d36b8583 DG |
266 | */ |
267 | int kernel_enable_channel(struct ltt_kernel_channel *chan) | |
268 | { | |
269 | int ret; | |
270 | ||
271 | ret = kernctl_enable(chan->fd); | |
54d01ffb | 272 | if (ret < 0 && errno != EEXIST) { |
df0f840b | 273 | PERROR("Enable kernel chan"); |
d36b8583 DG |
274 | goto error; |
275 | } | |
276 | ||
277 | chan->enabled = 1; | |
278 | DBG("Kernel channel %s enabled (fd: %d)", chan->channel->name, chan->fd); | |
279 | ||
280 | return 0; | |
281 | ||
282 | error: | |
283 | return ret; | |
284 | } | |
285 | ||
19e70852 | 286 | /* |
050349bb | 287 | * Enable a kernel event. |
19e70852 DG |
288 | */ |
289 | int kernel_enable_event(struct ltt_kernel_event *event) | |
290 | { | |
291 | int ret; | |
292 | ||
293 | ret = kernctl_enable(event->fd); | |
54d01ffb | 294 | if (ret < 0 && errno != EEXIST) { |
df0f840b | 295 | PERROR("enable kernel event"); |
19e70852 DG |
296 | goto error; |
297 | } | |
298 | ||
299 | event->enabled = 1; | |
300 | DBG("Kernel event %s enabled (fd: %d)", event->event->name, event->fd); | |
301 | ||
302 | return 0; | |
303 | ||
304 | error: | |
d36b8583 | 305 | return ret; |
19e70852 DG |
306 | } |
307 | ||
e953ef25 | 308 | /* |
050349bb | 309 | * Disable a kernel event. |
e953ef25 | 310 | */ |
19e70852 | 311 | int kernel_disable_event(struct ltt_kernel_event *event) |
e953ef25 DG |
312 | { |
313 | int ret; | |
19e70852 DG |
314 | |
315 | ret = kernctl_disable(event->fd); | |
54d01ffb | 316 | if (ret < 0 && errno != EEXIST) { |
df0f840b | 317 | PERROR("disable kernel event"); |
19e70852 | 318 | goto error; |
e953ef25 | 319 | } |
f3ed775e | 320 | |
19e70852 DG |
321 | event->enabled = 0; |
322 | DBG("Kernel event %s disabled (fd: %d)", event->event->name, event->fd); | |
323 | ||
f34daff7 DG |
324 | return 0; |
325 | ||
326 | error: | |
d36b8583 | 327 | return ret; |
f34daff7 | 328 | } |
aaf26714 DG |
329 | |
330 | /* | |
050349bb DG |
331 | * Create kernel metadata, open from the kernel tracer and add it to the |
332 | * kernel session. | |
aaf26714 | 333 | */ |
58a97671 | 334 | int kernel_open_metadata(struct ltt_kernel_session *session, char *path) |
aaf26714 DG |
335 | { |
336 | int ret; | |
337 | struct ltt_kernel_metadata *lkm; | |
aaf26714 | 338 | |
54012638 | 339 | /* Allocate kernel metadata */ |
62499ad6 | 340 | lkm = trace_kernel_create_metadata(path); |
54012638 | 341 | if (lkm == NULL) { |
aaf26714 DG |
342 | goto error; |
343 | } | |
344 | ||
54012638 | 345 | /* Kernel tracer metadata creation */ |
f3ed775e | 346 | ret = kernctl_open_metadata(session->fd, &lkm->conf->attr); |
aaf26714 DG |
347 | if (ret < 0) { |
348 | goto error; | |
349 | } | |
350 | ||
8c0faa1d | 351 | lkm->fd = ret; |
7b395890 DG |
352 | /* Prevent fd duplication after execlp() */ |
353 | ret = fcntl(lkm->fd, F_SETFD, FD_CLOEXEC); | |
354 | if (ret < 0) { | |
df0f840b | 355 | PERROR("fcntl session fd"); |
7b395890 DG |
356 | } |
357 | ||
aaf26714 | 358 | session->metadata = lkm; |
8c0faa1d | 359 | |
54012638 | 360 | DBG("Kernel metadata opened (fd: %d and path: %s)", lkm->fd, lkm->pathname); |
8c0faa1d DG |
361 | |
362 | return 0; | |
363 | ||
364 | error: | |
54012638 | 365 | return -1; |
8c0faa1d DG |
366 | } |
367 | ||
368 | /* | |
050349bb | 369 | * Start tracing session. |
8c0faa1d DG |
370 | */ |
371 | int kernel_start_session(struct ltt_kernel_session *session) | |
372 | { | |
373 | int ret; | |
374 | ||
375 | ret = kernctl_start_session(session->fd); | |
376 | if (ret < 0) { | |
df0f840b | 377 | PERROR("ioctl start session"); |
8c0faa1d DG |
378 | goto error; |
379 | } | |
380 | ||
381 | DBG("Kernel session started"); | |
382 | ||
383 | return 0; | |
384 | ||
385 | error: | |
386 | return ret; | |
387 | } | |
388 | ||
f3ed775e | 389 | /* |
050349bb | 390 | * Make a kernel wait to make sure in-flight probe have completed. |
f3ed775e DG |
391 | */ |
392 | void kernel_wait_quiescent(int fd) | |
393 | { | |
394 | int ret; | |
395 | ||
396 | DBG("Kernel quiescent wait on %d", fd); | |
397 | ||
398 | ret = kernctl_wait_quiescent(fd); | |
399 | if (ret < 0) { | |
df0f840b | 400 | PERROR("wait quiescent ioctl"); |
f3ed775e DG |
401 | ERR("Kernel quiescent wait failed"); |
402 | } | |
403 | } | |
404 | ||
d0254c7c | 405 | /* |
050349bb | 406 | * Kernel calibrate |
d0254c7c MD |
407 | */ |
408 | int kernel_calibrate(int fd, struct lttng_kernel_calibrate *calibrate) | |
409 | { | |
410 | int ret; | |
411 | ||
412 | ret = kernctl_calibrate(fd, calibrate); | |
413 | if (ret < 0) { | |
df0f840b | 414 | PERROR("calibrate ioctl"); |
d0254c7c MD |
415 | return -1; |
416 | } | |
417 | ||
418 | return 0; | |
419 | } | |
420 | ||
421 | ||
f3ed775e | 422 | /* |
f3ed775e DG |
423 | * Force flush buffer of metadata. |
424 | */ | |
425 | int kernel_metadata_flush_buffer(int fd) | |
426 | { | |
427 | int ret; | |
428 | ||
429 | ret = kernctl_buffer_flush(fd); | |
430 | if (ret < 0) { | |
431 | ERR("Fail to flush metadata buffers %d (ret: %d", fd, ret); | |
432 | } | |
433 | ||
434 | return 0; | |
435 | } | |
436 | ||
437 | /* | |
050349bb | 438 | * Force flush buffer for channel. |
f3ed775e DG |
439 | */ |
440 | int kernel_flush_buffer(struct ltt_kernel_channel *channel) | |
441 | { | |
442 | int ret; | |
443 | struct ltt_kernel_stream *stream; | |
444 | ||
445 | DBG("Flush buffer for channel %s", channel->channel->name); | |
446 | ||
447 | cds_list_for_each_entry(stream, &channel->stream_list.head, list) { | |
448 | DBG("Flushing channel stream %d", stream->fd); | |
449 | ret = kernctl_buffer_flush(stream->fd); | |
450 | if (ret < 0) { | |
df0f840b | 451 | PERROR("ioctl"); |
f3ed775e DG |
452 | ERR("Fail to flush buffer for stream %d (ret: %d)", |
453 | stream->fd, ret); | |
454 | } | |
455 | } | |
456 | ||
457 | return 0; | |
458 | } | |
459 | ||
8c0faa1d | 460 | /* |
050349bb | 461 | * Stop tracing session. |
8c0faa1d DG |
462 | */ |
463 | int kernel_stop_session(struct ltt_kernel_session *session) | |
464 | { | |
465 | int ret; | |
466 | ||
467 | ret = kernctl_stop_session(session->fd); | |
468 | if (ret < 0) { | |
469 | goto error; | |
470 | } | |
471 | ||
472 | DBG("Kernel session stopped"); | |
473 | ||
474 | return 0; | |
475 | ||
476 | error: | |
477 | return ret; | |
478 | } | |
479 | ||
480 | /* | |
050349bb DG |
481 | * Open stream of channel, register it to the kernel tracer and add it |
482 | * to the stream list of the channel. | |
8c0faa1d | 483 | * |
050349bb | 484 | * Return the number of created stream. Else, a negative value. |
8c0faa1d | 485 | */ |
f3ed775e | 486 | int kernel_open_channel_stream(struct ltt_kernel_channel *channel) |
8c0faa1d DG |
487 | { |
488 | int ret; | |
489 | struct ltt_kernel_stream *lks; | |
490 | ||
5a47c6a2 | 491 | while ((ret = kernctl_create_stream(channel->fd)) >= 0) { |
62499ad6 | 492 | lks = trace_kernel_create_stream(); |
8c0faa1d | 493 | if (lks == NULL) { |
799e2c4f MD |
494 | ret = close(ret); |
495 | if (ret) { | |
496 | PERROR("close"); | |
497 | } | |
8c0faa1d DG |
498 | goto error; |
499 | } | |
500 | ||
501 | lks->fd = ret; | |
7b395890 DG |
502 | /* Prevent fd duplication after execlp() */ |
503 | ret = fcntl(lks->fd, F_SETFD, FD_CLOEXEC); | |
504 | if (ret < 0) { | |
df0f840b | 505 | PERROR("fcntl session fd"); |
7b395890 DG |
506 | } |
507 | ||
8e68d1c8 DG |
508 | ret = asprintf(&lks->pathname, "%s/%s_%d", |
509 | channel->pathname, channel->channel->name, channel->stream_count); | |
8c0faa1d | 510 | if (ret < 0) { |
df0f840b | 511 | PERROR("asprintf kernel create stream"); |
8c0faa1d DG |
512 | goto error; |
513 | } | |
8c0faa1d | 514 | |
54012638 | 515 | /* Add stream to channe stream list */ |
8c0faa1d DG |
516 | cds_list_add(&lks->list, &channel->stream_list.head); |
517 | channel->stream_count++; | |
8c0faa1d | 518 | |
54012638 DG |
519 | DBG("Kernel stream %d created (fd: %d, state: %d, path: %s)", |
520 | channel->stream_count, lks->fd, lks->state, lks->pathname); | |
521 | } | |
8c0faa1d DG |
522 | |
523 | return channel->stream_count; | |
524 | ||
525 | error: | |
54012638 | 526 | return -1; |
8c0faa1d DG |
527 | } |
528 | ||
529 | /* | |
050349bb | 530 | * Open the metadata stream and set it to the kernel session. |
8c0faa1d | 531 | */ |
f3ed775e | 532 | int kernel_open_metadata_stream(struct ltt_kernel_session *session) |
8c0faa1d DG |
533 | { |
534 | int ret; | |
535 | ||
536 | ret = kernctl_create_stream(session->metadata->fd); | |
537 | if (ret < 0) { | |
df0f840b | 538 | PERROR("kernel create metadata stream"); |
8c0faa1d DG |
539 | goto error; |
540 | } | |
541 | ||
542 | DBG("Kernel metadata stream created (fd: %d)", ret); | |
543 | session->metadata_stream_fd = ret; | |
7b395890 DG |
544 | /* Prevent fd duplication after execlp() */ |
545 | ret = fcntl(session->metadata_stream_fd, F_SETFD, FD_CLOEXEC); | |
546 | if (ret < 0) { | |
df0f840b | 547 | PERROR("fcntl session fd"); |
7b395890 | 548 | } |
aaf26714 DG |
549 | |
550 | return 0; | |
551 | ||
552 | error: | |
54012638 | 553 | return -1; |
aaf26714 | 554 | } |
2ef84c95 DG |
555 | |
556 | /* | |
9f19cc17 | 557 | * Get the event list from the kernel tracer and return the number of elements. |
2ef84c95 | 558 | */ |
9f19cc17 | 559 | ssize_t kernel_list_events(int tracer_fd, struct lttng_event **events) |
2ef84c95 | 560 | { |
799e2c4f | 561 | int fd, pos, ret; |
9f19cc17 DG |
562 | char *event; |
563 | size_t nbmem, count = 0; | |
2ef84c95 DG |
564 | ssize_t size; |
565 | FILE *fp; | |
9f19cc17 | 566 | struct lttng_event *elist; |
2ef84c95 DG |
567 | |
568 | fd = kernctl_tracepoint_list(tracer_fd); | |
569 | if (fd < 0) { | |
df0f840b | 570 | PERROR("kernel tracepoint list"); |
2ef84c95 DG |
571 | goto error; |
572 | } | |
573 | ||
574 | fp = fdopen(fd, "r"); | |
575 | if (fp == NULL) { | |
df0f840b | 576 | PERROR("kernel tracepoint list fdopen"); |
61b73b12 | 577 | goto error_fp; |
2ef84c95 DG |
578 | } |
579 | ||
580 | /* | |
581 | * Init memory size counter | |
582 | * See kernel-ctl.h for explanation of this value | |
583 | */ | |
6725fe19 | 584 | nbmem = KERNEL_EVENT_INIT_LIST_SIZE; |
ba7f0ae5 | 585 | elist = zmalloc(sizeof(struct lttng_event) * nbmem); |
2ef84c95 | 586 | |
9f19cc17 | 587 | while ((size = fscanf(fp, "event { name = %m[^;]; };%n\n", &event, &pos)) == 1) { |
6725fe19 | 588 | if (count >= nbmem) { |
ced2f820 | 589 | DBG("Reallocating event list from %zu to %zu bytes", nbmem, |
6725fe19 DG |
590 | nbmem * 2); |
591 | /* Double the size */ | |
592 | nbmem <<= 1; | |
2f221590 | 593 | elist = realloc(elist, nbmem * sizeof(struct lttng_event)); |
9f19cc17 | 594 | if (elist == NULL) { |
df0f840b | 595 | PERROR("realloc list events"); |
61b73b12 MD |
596 | count = -ENOMEM; |
597 | goto end; | |
2ef84c95 DG |
598 | } |
599 | } | |
99497cd0 MD |
600 | strncpy(elist[count].name, event, LTTNG_SYMBOL_NAME_LEN); |
601 | elist[count].name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0'; | |
67b9d018 | 602 | elist[count].enabled = -1; |
9f19cc17 | 603 | count++; |
2ef84c95 DG |
604 | } |
605 | ||
9f19cc17 | 606 | *events = elist; |
ced2f820 | 607 | DBG("Kernel list events done (%zu events)", count); |
61b73b12 | 608 | end: |
799e2c4f MD |
609 | ret = fclose(fp); /* closes both fp and fd */ |
610 | if (ret) { | |
611 | PERROR("fclose"); | |
612 | } | |
9f19cc17 | 613 | return count; |
2ef84c95 | 614 | |
61b73b12 | 615 | error_fp: |
799e2c4f MD |
616 | ret = close(fd); |
617 | if (ret) { | |
618 | PERROR("close"); | |
619 | } | |
2ef84c95 DG |
620 | error: |
621 | return -1; | |
622 | } | |
096102bd DG |
623 | |
624 | /* | |
625 | * Get kernel version and validate it. | |
626 | */ | |
627 | int kernel_validate_version(int tracer_fd) | |
628 | { | |
629 | int ret; | |
630 | struct lttng_kernel_tracer_version version; | |
631 | ||
632 | ret = kernctl_tracer_version(tracer_fd, &version); | |
633 | if (ret < 0) { | |
634 | ERR("Failed at getting the lttng-modules version"); | |
635 | goto error; | |
636 | } | |
637 | ||
638 | /* Validate version */ | |
a62a6556 MD |
639 | if (version.major != KERN_MODULES_PRE_MAJOR |
640 | && version.major != KERN_MODULES_MAJOR) { | |
096102bd | 641 | goto error_version; |
096102bd DG |
642 | } |
643 | ||
a62a6556 | 644 | DBG2("Kernel tracer version validated (major version %d)", version.major); |
096102bd DG |
645 | return 0; |
646 | ||
647 | error_version: | |
5df0f285 | 648 | ERR("Kernel major version %d is not compatible (supporting <= %d)", |
a62a6556 | 649 | version.major, KERN_MODULES_MAJOR) |
096102bd DG |
650 | ret = -1; |
651 | ||
652 | error: | |
653 | return ret; | |
654 | } | |
335a95b7 MD |
655 | |
656 | /* | |
657 | * Kernel work-arounds called at the start of sessiond main(). | |
658 | */ | |
659 | int init_kernel_workarounds(void) | |
660 | { | |
8936c33a | 661 | int ret; |
335a95b7 MD |
662 | FILE *fp; |
663 | ||
664 | /* | |
665 | * boot_id needs to be read once before being used concurrently | |
666 | * to deal with a Linux kernel race. A fix is proposed for | |
667 | * upstream, but the work-around is needed for older kernels. | |
668 | */ | |
669 | fp = fopen("/proc/sys/kernel/random/boot_id", "r"); | |
670 | if (!fp) { | |
671 | goto end_boot_id; | |
672 | } | |
673 | while (!feof(fp)) { | |
674 | char buf[37] = ""; | |
675 | ||
8936c33a DG |
676 | ret = fread(buf, 1, sizeof(buf), fp); |
677 | if (ret < 0) { | |
678 | /* Ignore error, we don't really care */ | |
679 | } | |
335a95b7 | 680 | } |
799e2c4f MD |
681 | ret = fclose(fp); |
682 | if (ret) { | |
683 | PERROR("fclose"); | |
684 | } | |
335a95b7 | 685 | end_boot_id: |
335a95b7 MD |
686 | return 0; |
687 | } |