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> |
42224349 | 28 | #include <common/sessiond-comm/sessiond-comm.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); | |
42224349 DG |
294 | if (ret < 0) { |
295 | switch (errno) { | |
296 | case EEXIST: | |
297 | ret = LTTCOMM_KERN_EVENT_EXIST; | |
298 | break; | |
299 | default: | |
300 | PERROR("enable kernel event"); | |
301 | break; | |
302 | } | |
19e70852 DG |
303 | goto error; |
304 | } | |
305 | ||
306 | event->enabled = 1; | |
307 | DBG("Kernel event %s enabled (fd: %d)", event->event->name, event->fd); | |
308 | ||
309 | return 0; | |
310 | ||
311 | error: | |
d36b8583 | 312 | return ret; |
19e70852 DG |
313 | } |
314 | ||
e953ef25 | 315 | /* |
050349bb | 316 | * Disable a kernel event. |
e953ef25 | 317 | */ |
19e70852 | 318 | int kernel_disable_event(struct ltt_kernel_event *event) |
e953ef25 DG |
319 | { |
320 | int ret; | |
19e70852 DG |
321 | |
322 | ret = kernctl_disable(event->fd); | |
42224349 DG |
323 | if (ret < 0) { |
324 | switch (errno) { | |
325 | case EEXIST: | |
326 | ret = LTTCOMM_KERN_EVENT_EXIST; | |
327 | break; | |
328 | default: | |
329 | PERROR("disable kernel event"); | |
330 | break; | |
331 | } | |
19e70852 | 332 | goto error; |
e953ef25 | 333 | } |
f3ed775e | 334 | |
19e70852 DG |
335 | event->enabled = 0; |
336 | DBG("Kernel event %s disabled (fd: %d)", event->event->name, event->fd); | |
337 | ||
f34daff7 DG |
338 | return 0; |
339 | ||
340 | error: | |
d36b8583 | 341 | return ret; |
f34daff7 | 342 | } |
aaf26714 DG |
343 | |
344 | /* | |
050349bb DG |
345 | * Create kernel metadata, open from the kernel tracer and add it to the |
346 | * kernel session. | |
aaf26714 | 347 | */ |
58a97671 | 348 | int kernel_open_metadata(struct ltt_kernel_session *session, char *path) |
aaf26714 DG |
349 | { |
350 | int ret; | |
351 | struct ltt_kernel_metadata *lkm; | |
aaf26714 | 352 | |
54012638 | 353 | /* Allocate kernel metadata */ |
62499ad6 | 354 | lkm = trace_kernel_create_metadata(path); |
54012638 | 355 | if (lkm == NULL) { |
aaf26714 DG |
356 | goto error; |
357 | } | |
358 | ||
54012638 | 359 | /* Kernel tracer metadata creation */ |
f3ed775e | 360 | ret = kernctl_open_metadata(session->fd, &lkm->conf->attr); |
aaf26714 DG |
361 | if (ret < 0) { |
362 | goto error; | |
363 | } | |
364 | ||
8c0faa1d | 365 | lkm->fd = ret; |
7b395890 DG |
366 | /* Prevent fd duplication after execlp() */ |
367 | ret = fcntl(lkm->fd, F_SETFD, FD_CLOEXEC); | |
368 | if (ret < 0) { | |
df0f840b | 369 | PERROR("fcntl session fd"); |
7b395890 DG |
370 | } |
371 | ||
aaf26714 | 372 | session->metadata = lkm; |
8c0faa1d | 373 | |
54012638 | 374 | DBG("Kernel metadata opened (fd: %d and path: %s)", lkm->fd, lkm->pathname); |
8c0faa1d DG |
375 | |
376 | return 0; | |
377 | ||
378 | error: | |
54012638 | 379 | return -1; |
8c0faa1d DG |
380 | } |
381 | ||
382 | /* | |
050349bb | 383 | * Start tracing session. |
8c0faa1d DG |
384 | */ |
385 | int kernel_start_session(struct ltt_kernel_session *session) | |
386 | { | |
387 | int ret; | |
388 | ||
389 | ret = kernctl_start_session(session->fd); | |
390 | if (ret < 0) { | |
df0f840b | 391 | PERROR("ioctl start session"); |
8c0faa1d DG |
392 | goto error; |
393 | } | |
394 | ||
395 | DBG("Kernel session started"); | |
396 | ||
397 | return 0; | |
398 | ||
399 | error: | |
400 | return ret; | |
401 | } | |
402 | ||
f3ed775e | 403 | /* |
050349bb | 404 | * Make a kernel wait to make sure in-flight probe have completed. |
f3ed775e DG |
405 | */ |
406 | void kernel_wait_quiescent(int fd) | |
407 | { | |
408 | int ret; | |
409 | ||
410 | DBG("Kernel quiescent wait on %d", fd); | |
411 | ||
412 | ret = kernctl_wait_quiescent(fd); | |
413 | if (ret < 0) { | |
df0f840b | 414 | PERROR("wait quiescent ioctl"); |
f3ed775e DG |
415 | ERR("Kernel quiescent wait failed"); |
416 | } | |
417 | } | |
418 | ||
d0254c7c | 419 | /* |
050349bb | 420 | * Kernel calibrate |
d0254c7c MD |
421 | */ |
422 | int kernel_calibrate(int fd, struct lttng_kernel_calibrate *calibrate) | |
423 | { | |
424 | int ret; | |
425 | ||
426 | ret = kernctl_calibrate(fd, calibrate); | |
427 | if (ret < 0) { | |
df0f840b | 428 | PERROR("calibrate ioctl"); |
d0254c7c MD |
429 | return -1; |
430 | } | |
431 | ||
432 | return 0; | |
433 | } | |
434 | ||
435 | ||
f3ed775e | 436 | /* |
f3ed775e DG |
437 | * Force flush buffer of metadata. |
438 | */ | |
439 | int kernel_metadata_flush_buffer(int fd) | |
440 | { | |
441 | int ret; | |
442 | ||
443 | ret = kernctl_buffer_flush(fd); | |
444 | if (ret < 0) { | |
445 | ERR("Fail to flush metadata buffers %d (ret: %d", fd, ret); | |
446 | } | |
447 | ||
448 | return 0; | |
449 | } | |
450 | ||
451 | /* | |
050349bb | 452 | * Force flush buffer for channel. |
f3ed775e DG |
453 | */ |
454 | int kernel_flush_buffer(struct ltt_kernel_channel *channel) | |
455 | { | |
456 | int ret; | |
457 | struct ltt_kernel_stream *stream; | |
458 | ||
459 | DBG("Flush buffer for channel %s", channel->channel->name); | |
460 | ||
461 | cds_list_for_each_entry(stream, &channel->stream_list.head, list) { | |
462 | DBG("Flushing channel stream %d", stream->fd); | |
463 | ret = kernctl_buffer_flush(stream->fd); | |
464 | if (ret < 0) { | |
df0f840b | 465 | PERROR("ioctl"); |
f3ed775e DG |
466 | ERR("Fail to flush buffer for stream %d (ret: %d)", |
467 | stream->fd, ret); | |
468 | } | |
469 | } | |
470 | ||
471 | return 0; | |
472 | } | |
473 | ||
8c0faa1d | 474 | /* |
050349bb | 475 | * Stop tracing session. |
8c0faa1d DG |
476 | */ |
477 | int kernel_stop_session(struct ltt_kernel_session *session) | |
478 | { | |
479 | int ret; | |
480 | ||
481 | ret = kernctl_stop_session(session->fd); | |
482 | if (ret < 0) { | |
483 | goto error; | |
484 | } | |
485 | ||
486 | DBG("Kernel session stopped"); | |
487 | ||
488 | return 0; | |
489 | ||
490 | error: | |
491 | return ret; | |
492 | } | |
493 | ||
494 | /* | |
050349bb DG |
495 | * Open stream of channel, register it to the kernel tracer and add it |
496 | * to the stream list of the channel. | |
8c0faa1d | 497 | * |
050349bb | 498 | * Return the number of created stream. Else, a negative value. |
8c0faa1d | 499 | */ |
f3ed775e | 500 | int kernel_open_channel_stream(struct ltt_kernel_channel *channel) |
8c0faa1d DG |
501 | { |
502 | int ret; | |
503 | struct ltt_kernel_stream *lks; | |
504 | ||
5a47c6a2 | 505 | while ((ret = kernctl_create_stream(channel->fd)) >= 0) { |
62499ad6 | 506 | lks = trace_kernel_create_stream(); |
8c0faa1d | 507 | if (lks == NULL) { |
799e2c4f MD |
508 | ret = close(ret); |
509 | if (ret) { | |
510 | PERROR("close"); | |
511 | } | |
8c0faa1d DG |
512 | goto error; |
513 | } | |
514 | ||
515 | lks->fd = ret; | |
7b395890 DG |
516 | /* Prevent fd duplication after execlp() */ |
517 | ret = fcntl(lks->fd, F_SETFD, FD_CLOEXEC); | |
518 | if (ret < 0) { | |
df0f840b | 519 | PERROR("fcntl session fd"); |
7b395890 DG |
520 | } |
521 | ||
8e68d1c8 DG |
522 | ret = asprintf(&lks->pathname, "%s/%s_%d", |
523 | channel->pathname, channel->channel->name, channel->stream_count); | |
8c0faa1d | 524 | if (ret < 0) { |
df0f840b | 525 | PERROR("asprintf kernel create stream"); |
8c0faa1d DG |
526 | goto error; |
527 | } | |
8c0faa1d | 528 | |
54012638 | 529 | /* Add stream to channe stream list */ |
8c0faa1d DG |
530 | cds_list_add(&lks->list, &channel->stream_list.head); |
531 | channel->stream_count++; | |
8c0faa1d | 532 | |
54012638 DG |
533 | DBG("Kernel stream %d created (fd: %d, state: %d, path: %s)", |
534 | channel->stream_count, lks->fd, lks->state, lks->pathname); | |
535 | } | |
8c0faa1d DG |
536 | |
537 | return channel->stream_count; | |
538 | ||
539 | error: | |
54012638 | 540 | return -1; |
8c0faa1d DG |
541 | } |
542 | ||
543 | /* | |
050349bb | 544 | * Open the metadata stream and set it to the kernel session. |
8c0faa1d | 545 | */ |
f3ed775e | 546 | int kernel_open_metadata_stream(struct ltt_kernel_session *session) |
8c0faa1d DG |
547 | { |
548 | int ret; | |
549 | ||
550 | ret = kernctl_create_stream(session->metadata->fd); | |
551 | if (ret < 0) { | |
df0f840b | 552 | PERROR("kernel create metadata stream"); |
8c0faa1d DG |
553 | goto error; |
554 | } | |
555 | ||
556 | DBG("Kernel metadata stream created (fd: %d)", ret); | |
557 | session->metadata_stream_fd = ret; | |
7b395890 DG |
558 | /* Prevent fd duplication after execlp() */ |
559 | ret = fcntl(session->metadata_stream_fd, F_SETFD, FD_CLOEXEC); | |
560 | if (ret < 0) { | |
df0f840b | 561 | PERROR("fcntl session fd"); |
7b395890 | 562 | } |
aaf26714 DG |
563 | |
564 | return 0; | |
565 | ||
566 | error: | |
54012638 | 567 | return -1; |
aaf26714 | 568 | } |
2ef84c95 DG |
569 | |
570 | /* | |
9f19cc17 | 571 | * Get the event list from the kernel tracer and return the number of elements. |
2ef84c95 | 572 | */ |
9f19cc17 | 573 | ssize_t kernel_list_events(int tracer_fd, struct lttng_event **events) |
2ef84c95 | 574 | { |
799e2c4f | 575 | int fd, pos, ret; |
9f19cc17 DG |
576 | char *event; |
577 | size_t nbmem, count = 0; | |
2ef84c95 DG |
578 | ssize_t size; |
579 | FILE *fp; | |
9f19cc17 | 580 | struct lttng_event *elist; |
2ef84c95 DG |
581 | |
582 | fd = kernctl_tracepoint_list(tracer_fd); | |
583 | if (fd < 0) { | |
df0f840b | 584 | PERROR("kernel tracepoint list"); |
2ef84c95 DG |
585 | goto error; |
586 | } | |
587 | ||
588 | fp = fdopen(fd, "r"); | |
589 | if (fp == NULL) { | |
df0f840b | 590 | PERROR("kernel tracepoint list fdopen"); |
61b73b12 | 591 | goto error_fp; |
2ef84c95 DG |
592 | } |
593 | ||
594 | /* | |
595 | * Init memory size counter | |
596 | * See kernel-ctl.h for explanation of this value | |
597 | */ | |
6725fe19 | 598 | nbmem = KERNEL_EVENT_INIT_LIST_SIZE; |
ba7f0ae5 | 599 | elist = zmalloc(sizeof(struct lttng_event) * nbmem); |
2ef84c95 | 600 | |
9f19cc17 | 601 | while ((size = fscanf(fp, "event { name = %m[^;]; };%n\n", &event, &pos)) == 1) { |
6725fe19 | 602 | if (count >= nbmem) { |
ced2f820 | 603 | DBG("Reallocating event list from %zu to %zu bytes", nbmem, |
6725fe19 DG |
604 | nbmem * 2); |
605 | /* Double the size */ | |
606 | nbmem <<= 1; | |
2f221590 | 607 | elist = realloc(elist, nbmem * sizeof(struct lttng_event)); |
9f19cc17 | 608 | if (elist == NULL) { |
df0f840b | 609 | PERROR("realloc list events"); |
61b73b12 MD |
610 | count = -ENOMEM; |
611 | goto end; | |
2ef84c95 DG |
612 | } |
613 | } | |
99497cd0 MD |
614 | strncpy(elist[count].name, event, LTTNG_SYMBOL_NAME_LEN); |
615 | elist[count].name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0'; | |
67b9d018 | 616 | elist[count].enabled = -1; |
9f19cc17 | 617 | count++; |
2ef84c95 DG |
618 | } |
619 | ||
9f19cc17 | 620 | *events = elist; |
ced2f820 | 621 | DBG("Kernel list events done (%zu events)", count); |
61b73b12 | 622 | end: |
799e2c4f MD |
623 | ret = fclose(fp); /* closes both fp and fd */ |
624 | if (ret) { | |
625 | PERROR("fclose"); | |
626 | } | |
9f19cc17 | 627 | return count; |
2ef84c95 | 628 | |
61b73b12 | 629 | error_fp: |
799e2c4f MD |
630 | ret = close(fd); |
631 | if (ret) { | |
632 | PERROR("close"); | |
633 | } | |
2ef84c95 DG |
634 | error: |
635 | return -1; | |
636 | } | |
096102bd DG |
637 | |
638 | /* | |
639 | * Get kernel version and validate it. | |
640 | */ | |
641 | int kernel_validate_version(int tracer_fd) | |
642 | { | |
643 | int ret; | |
644 | struct lttng_kernel_tracer_version version; | |
645 | ||
646 | ret = kernctl_tracer_version(tracer_fd, &version); | |
647 | if (ret < 0) { | |
648 | ERR("Failed at getting the lttng-modules version"); | |
649 | goto error; | |
650 | } | |
651 | ||
652 | /* Validate version */ | |
a62a6556 MD |
653 | if (version.major != KERN_MODULES_PRE_MAJOR |
654 | && version.major != KERN_MODULES_MAJOR) { | |
096102bd | 655 | goto error_version; |
096102bd DG |
656 | } |
657 | ||
a62a6556 | 658 | DBG2("Kernel tracer version validated (major version %d)", version.major); |
096102bd DG |
659 | return 0; |
660 | ||
661 | error_version: | |
5df0f285 | 662 | ERR("Kernel major version %d is not compatible (supporting <= %d)", |
a62a6556 | 663 | version.major, KERN_MODULES_MAJOR) |
096102bd DG |
664 | ret = -1; |
665 | ||
666 | error: | |
667 | return ret; | |
668 | } | |
335a95b7 MD |
669 | |
670 | /* | |
671 | * Kernel work-arounds called at the start of sessiond main(). | |
672 | */ | |
673 | int init_kernel_workarounds(void) | |
674 | { | |
8936c33a | 675 | int ret; |
335a95b7 MD |
676 | FILE *fp; |
677 | ||
678 | /* | |
679 | * boot_id needs to be read once before being used concurrently | |
680 | * to deal with a Linux kernel race. A fix is proposed for | |
681 | * upstream, but the work-around is needed for older kernels. | |
682 | */ | |
683 | fp = fopen("/proc/sys/kernel/random/boot_id", "r"); | |
684 | if (!fp) { | |
685 | goto end_boot_id; | |
686 | } | |
687 | while (!feof(fp)) { | |
688 | char buf[37] = ""; | |
689 | ||
8936c33a DG |
690 | ret = fread(buf, 1, sizeof(buf), fp); |
691 | if (ret < 0) { | |
692 | /* Ignore error, we don't really care */ | |
693 | } | |
335a95b7 | 694 | } |
799e2c4f MD |
695 | ret = fclose(fp); |
696 | if (ret) { | |
697 | PERROR("fclose"); | |
698 | } | |
335a95b7 | 699 | end_boot_id: |
335a95b7 MD |
700 | return 0; |
701 | } |