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) { | |
bd29c13d DG |
199 | switch (errno) { |
200 | case EEXIST: | |
201 | break; | |
202 | case ENOSYS: | |
203 | WARN("Event type not implemented"); | |
204 | break; | |
205 | default: | |
d87bfb32 DG |
206 | PERROR("create event ioctl"); |
207 | } | |
208 | ret = -errno; | |
e953ef25 | 209 | goto free_event; |
8c0faa1d | 210 | } |
f34daff7 | 211 | |
5f822d0a | 212 | /* |
2c425ff7 | 213 | * LTTNG_KERNEL_SYSCALL event creation will return 0 on success. |
5f822d0a DG |
214 | */ |
215 | if (ret == 0 && event->event->instrumentation == LTTNG_KERNEL_SYSCALL) { | |
216 | DBG2("Kernel event syscall creation success"); | |
87eb4ab8 MD |
217 | /* |
218 | * We use fd == -1 to ensure that we never trigger a close of fd | |
219 | * 0. | |
220 | */ | |
221 | event->fd = -1; | |
2c425ff7 | 222 | goto add_list; |
5f822d0a DG |
223 | } |
224 | ||
f3ed775e | 225 | event->fd = ret; |
7b395890 DG |
226 | /* Prevent fd duplication after execlp() */ |
227 | ret = fcntl(event->fd, F_SETFD, FD_CLOEXEC); | |
228 | if (ret < 0) { | |
df0f840b | 229 | PERROR("fcntl session fd"); |
7b395890 DG |
230 | } |
231 | ||
2c425ff7 | 232 | add_list: |
f3ed775e DG |
233 | /* Add event to event list */ |
234 | cds_list_add(&event->list, &channel->events_list.head); | |
cbbbb275 DG |
235 | channel->event_count++; |
236 | ||
e953ef25 DG |
237 | DBG("Event %s created (fd: %d)", ev->name, event->fd); |
238 | ||
239 | return 0; | |
240 | ||
241 | free_event: | |
242 | free(event); | |
243 | error: | |
d87bfb32 | 244 | return ret; |
e953ef25 DG |
245 | } |
246 | ||
26cc6b4e | 247 | /* |
050349bb | 248 | * Disable a kernel channel. |
26cc6b4e DG |
249 | */ |
250 | int kernel_disable_channel(struct ltt_kernel_channel *chan) | |
251 | { | |
252 | int ret; | |
253 | ||
254 | ret = kernctl_disable(chan->fd); | |
255 | if (ret < 0) { | |
df0f840b | 256 | PERROR("disable chan ioctl"); |
26cc6b4e DG |
257 | ret = errno; |
258 | goto error; | |
259 | } | |
260 | ||
261 | chan->enabled = 0; | |
262 | DBG("Kernel channel %s disabled (fd: %d)", chan->channel->name, chan->fd); | |
263 | ||
264 | return 0; | |
265 | ||
266 | error: | |
267 | return ret; | |
268 | } | |
269 | ||
d36b8583 | 270 | /* |
050349bb | 271 | * Enable a kernel channel. |
d36b8583 DG |
272 | */ |
273 | int kernel_enable_channel(struct ltt_kernel_channel *chan) | |
274 | { | |
275 | int ret; | |
276 | ||
277 | ret = kernctl_enable(chan->fd); | |
54d01ffb | 278 | if (ret < 0 && errno != EEXIST) { |
df0f840b | 279 | PERROR("Enable kernel chan"); |
d36b8583 DG |
280 | goto error; |
281 | } | |
282 | ||
283 | chan->enabled = 1; | |
284 | DBG("Kernel channel %s enabled (fd: %d)", chan->channel->name, chan->fd); | |
285 | ||
286 | return 0; | |
287 | ||
288 | error: | |
289 | return ret; | |
290 | } | |
291 | ||
19e70852 | 292 | /* |
050349bb | 293 | * Enable a kernel event. |
19e70852 DG |
294 | */ |
295 | int kernel_enable_event(struct ltt_kernel_event *event) | |
296 | { | |
297 | int ret; | |
298 | ||
299 | ret = kernctl_enable(event->fd); | |
42224349 DG |
300 | if (ret < 0) { |
301 | switch (errno) { | |
302 | case EEXIST: | |
303 | ret = LTTCOMM_KERN_EVENT_EXIST; | |
304 | break; | |
305 | default: | |
306 | PERROR("enable kernel event"); | |
307 | break; | |
308 | } | |
19e70852 DG |
309 | goto error; |
310 | } | |
311 | ||
312 | event->enabled = 1; | |
313 | DBG("Kernel event %s enabled (fd: %d)", event->event->name, event->fd); | |
314 | ||
315 | return 0; | |
316 | ||
317 | error: | |
d36b8583 | 318 | return ret; |
19e70852 DG |
319 | } |
320 | ||
e953ef25 | 321 | /* |
050349bb | 322 | * Disable a kernel event. |
e953ef25 | 323 | */ |
19e70852 | 324 | int kernel_disable_event(struct ltt_kernel_event *event) |
e953ef25 DG |
325 | { |
326 | int ret; | |
19e70852 DG |
327 | |
328 | ret = kernctl_disable(event->fd); | |
42224349 DG |
329 | if (ret < 0) { |
330 | switch (errno) { | |
331 | case EEXIST: | |
332 | ret = LTTCOMM_KERN_EVENT_EXIST; | |
333 | break; | |
334 | default: | |
335 | PERROR("disable kernel event"); | |
336 | break; | |
337 | } | |
19e70852 | 338 | goto error; |
e953ef25 | 339 | } |
f3ed775e | 340 | |
19e70852 DG |
341 | event->enabled = 0; |
342 | DBG("Kernel event %s disabled (fd: %d)", event->event->name, event->fd); | |
343 | ||
f34daff7 DG |
344 | return 0; |
345 | ||
346 | error: | |
d36b8583 | 347 | return ret; |
f34daff7 | 348 | } |
aaf26714 DG |
349 | |
350 | /* | |
050349bb DG |
351 | * Create kernel metadata, open from the kernel tracer and add it to the |
352 | * kernel session. | |
aaf26714 | 353 | */ |
58a97671 | 354 | int kernel_open_metadata(struct ltt_kernel_session *session, char *path) |
aaf26714 DG |
355 | { |
356 | int ret; | |
357 | struct ltt_kernel_metadata *lkm; | |
aaf26714 | 358 | |
54012638 | 359 | /* Allocate kernel metadata */ |
62499ad6 | 360 | lkm = trace_kernel_create_metadata(path); |
54012638 | 361 | if (lkm == NULL) { |
aaf26714 DG |
362 | goto error; |
363 | } | |
364 | ||
54012638 | 365 | /* Kernel tracer metadata creation */ |
f3ed775e | 366 | ret = kernctl_open_metadata(session->fd, &lkm->conf->attr); |
aaf26714 DG |
367 | if (ret < 0) { |
368 | goto error; | |
369 | } | |
370 | ||
8c0faa1d | 371 | lkm->fd = ret; |
7b395890 DG |
372 | /* Prevent fd duplication after execlp() */ |
373 | ret = fcntl(lkm->fd, F_SETFD, FD_CLOEXEC); | |
374 | if (ret < 0) { | |
df0f840b | 375 | PERROR("fcntl session fd"); |
7b395890 DG |
376 | } |
377 | ||
aaf26714 | 378 | session->metadata = lkm; |
8c0faa1d | 379 | |
54012638 | 380 | DBG("Kernel metadata opened (fd: %d and path: %s)", lkm->fd, lkm->pathname); |
8c0faa1d DG |
381 | |
382 | return 0; | |
383 | ||
384 | error: | |
54012638 | 385 | return -1; |
8c0faa1d DG |
386 | } |
387 | ||
388 | /* | |
050349bb | 389 | * Start tracing session. |
8c0faa1d DG |
390 | */ |
391 | int kernel_start_session(struct ltt_kernel_session *session) | |
392 | { | |
393 | int ret; | |
394 | ||
395 | ret = kernctl_start_session(session->fd); | |
396 | if (ret < 0) { | |
df0f840b | 397 | PERROR("ioctl start session"); |
8c0faa1d DG |
398 | goto error; |
399 | } | |
400 | ||
401 | DBG("Kernel session started"); | |
402 | ||
403 | return 0; | |
404 | ||
405 | error: | |
406 | return ret; | |
407 | } | |
408 | ||
f3ed775e | 409 | /* |
050349bb | 410 | * Make a kernel wait to make sure in-flight probe have completed. |
f3ed775e DG |
411 | */ |
412 | void kernel_wait_quiescent(int fd) | |
413 | { | |
414 | int ret; | |
415 | ||
416 | DBG("Kernel quiescent wait on %d", fd); | |
417 | ||
418 | ret = kernctl_wait_quiescent(fd); | |
419 | if (ret < 0) { | |
df0f840b | 420 | PERROR("wait quiescent ioctl"); |
f3ed775e DG |
421 | ERR("Kernel quiescent wait failed"); |
422 | } | |
423 | } | |
424 | ||
d0254c7c | 425 | /* |
050349bb | 426 | * Kernel calibrate |
d0254c7c MD |
427 | */ |
428 | int kernel_calibrate(int fd, struct lttng_kernel_calibrate *calibrate) | |
429 | { | |
430 | int ret; | |
431 | ||
432 | ret = kernctl_calibrate(fd, calibrate); | |
433 | if (ret < 0) { | |
df0f840b | 434 | PERROR("calibrate ioctl"); |
d0254c7c MD |
435 | return -1; |
436 | } | |
437 | ||
438 | return 0; | |
439 | } | |
440 | ||
441 | ||
f3ed775e | 442 | /* |
f3ed775e DG |
443 | * Force flush buffer of metadata. |
444 | */ | |
445 | int kernel_metadata_flush_buffer(int fd) | |
446 | { | |
447 | int ret; | |
448 | ||
449 | ret = kernctl_buffer_flush(fd); | |
450 | if (ret < 0) { | |
451 | ERR("Fail to flush metadata buffers %d (ret: %d", fd, ret); | |
452 | } | |
453 | ||
454 | return 0; | |
455 | } | |
456 | ||
457 | /* | |
050349bb | 458 | * Force flush buffer for channel. |
f3ed775e DG |
459 | */ |
460 | int kernel_flush_buffer(struct ltt_kernel_channel *channel) | |
461 | { | |
462 | int ret; | |
463 | struct ltt_kernel_stream *stream; | |
464 | ||
465 | DBG("Flush buffer for channel %s", channel->channel->name); | |
466 | ||
467 | cds_list_for_each_entry(stream, &channel->stream_list.head, list) { | |
468 | DBG("Flushing channel stream %d", stream->fd); | |
469 | ret = kernctl_buffer_flush(stream->fd); | |
470 | if (ret < 0) { | |
df0f840b | 471 | PERROR("ioctl"); |
f3ed775e DG |
472 | ERR("Fail to flush buffer for stream %d (ret: %d)", |
473 | stream->fd, ret); | |
474 | } | |
475 | } | |
476 | ||
477 | return 0; | |
478 | } | |
479 | ||
8c0faa1d | 480 | /* |
050349bb | 481 | * Stop tracing session. |
8c0faa1d DG |
482 | */ |
483 | int kernel_stop_session(struct ltt_kernel_session *session) | |
484 | { | |
485 | int ret; | |
486 | ||
487 | ret = kernctl_stop_session(session->fd); | |
488 | if (ret < 0) { | |
489 | goto error; | |
490 | } | |
491 | ||
492 | DBG("Kernel session stopped"); | |
493 | ||
494 | return 0; | |
495 | ||
496 | error: | |
497 | return ret; | |
498 | } | |
499 | ||
500 | /* | |
050349bb DG |
501 | * Open stream of channel, register it to the kernel tracer and add it |
502 | * to the stream list of the channel. | |
8c0faa1d | 503 | * |
050349bb | 504 | * Return the number of created stream. Else, a negative value. |
8c0faa1d | 505 | */ |
f3ed775e | 506 | int kernel_open_channel_stream(struct ltt_kernel_channel *channel) |
8c0faa1d DG |
507 | { |
508 | int ret; | |
509 | struct ltt_kernel_stream *lks; | |
510 | ||
5a47c6a2 | 511 | while ((ret = kernctl_create_stream(channel->fd)) >= 0) { |
62499ad6 | 512 | lks = trace_kernel_create_stream(); |
8c0faa1d | 513 | if (lks == NULL) { |
799e2c4f MD |
514 | ret = close(ret); |
515 | if (ret) { | |
516 | PERROR("close"); | |
517 | } | |
8c0faa1d DG |
518 | goto error; |
519 | } | |
520 | ||
521 | lks->fd = ret; | |
7b395890 DG |
522 | /* Prevent fd duplication after execlp() */ |
523 | ret = fcntl(lks->fd, F_SETFD, FD_CLOEXEC); | |
524 | if (ret < 0) { | |
df0f840b | 525 | PERROR("fcntl session fd"); |
7b395890 DG |
526 | } |
527 | ||
8e68d1c8 DG |
528 | ret = asprintf(&lks->pathname, "%s/%s_%d", |
529 | channel->pathname, channel->channel->name, channel->stream_count); | |
8c0faa1d | 530 | if (ret < 0) { |
df0f840b | 531 | PERROR("asprintf kernel create stream"); |
8c0faa1d DG |
532 | goto error; |
533 | } | |
8c0faa1d | 534 | |
54012638 | 535 | /* Add stream to channe stream list */ |
8c0faa1d DG |
536 | cds_list_add(&lks->list, &channel->stream_list.head); |
537 | channel->stream_count++; | |
8c0faa1d | 538 | |
54012638 DG |
539 | DBG("Kernel stream %d created (fd: %d, state: %d, path: %s)", |
540 | channel->stream_count, lks->fd, lks->state, lks->pathname); | |
541 | } | |
8c0faa1d DG |
542 | |
543 | return channel->stream_count; | |
544 | ||
545 | error: | |
54012638 | 546 | return -1; |
8c0faa1d DG |
547 | } |
548 | ||
549 | /* | |
050349bb | 550 | * Open the metadata stream and set it to the kernel session. |
8c0faa1d | 551 | */ |
f3ed775e | 552 | int kernel_open_metadata_stream(struct ltt_kernel_session *session) |
8c0faa1d DG |
553 | { |
554 | int ret; | |
555 | ||
556 | ret = kernctl_create_stream(session->metadata->fd); | |
557 | if (ret < 0) { | |
df0f840b | 558 | PERROR("kernel create metadata stream"); |
8c0faa1d DG |
559 | goto error; |
560 | } | |
561 | ||
562 | DBG("Kernel metadata stream created (fd: %d)", ret); | |
563 | session->metadata_stream_fd = ret; | |
7b395890 DG |
564 | /* Prevent fd duplication after execlp() */ |
565 | ret = fcntl(session->metadata_stream_fd, F_SETFD, FD_CLOEXEC); | |
566 | if (ret < 0) { | |
df0f840b | 567 | PERROR("fcntl session fd"); |
7b395890 | 568 | } |
aaf26714 DG |
569 | |
570 | return 0; | |
571 | ||
572 | error: | |
54012638 | 573 | return -1; |
aaf26714 | 574 | } |
2ef84c95 DG |
575 | |
576 | /* | |
9f19cc17 | 577 | * Get the event list from the kernel tracer and return the number of elements. |
2ef84c95 | 578 | */ |
9f19cc17 | 579 | ssize_t kernel_list_events(int tracer_fd, struct lttng_event **events) |
2ef84c95 | 580 | { |
799e2c4f | 581 | int fd, pos, ret; |
9f19cc17 DG |
582 | char *event; |
583 | size_t nbmem, count = 0; | |
2ef84c95 DG |
584 | ssize_t size; |
585 | FILE *fp; | |
9f19cc17 | 586 | struct lttng_event *elist; |
2ef84c95 DG |
587 | |
588 | fd = kernctl_tracepoint_list(tracer_fd); | |
589 | if (fd < 0) { | |
df0f840b | 590 | PERROR("kernel tracepoint list"); |
2ef84c95 DG |
591 | goto error; |
592 | } | |
593 | ||
594 | fp = fdopen(fd, "r"); | |
595 | if (fp == NULL) { | |
df0f840b | 596 | PERROR("kernel tracepoint list fdopen"); |
61b73b12 | 597 | goto error_fp; |
2ef84c95 DG |
598 | } |
599 | ||
600 | /* | |
601 | * Init memory size counter | |
602 | * See kernel-ctl.h for explanation of this value | |
603 | */ | |
6725fe19 | 604 | nbmem = KERNEL_EVENT_INIT_LIST_SIZE; |
ba7f0ae5 | 605 | elist = zmalloc(sizeof(struct lttng_event) * nbmem); |
3b870559 MD |
606 | if (elist == NULL) { |
607 | PERROR("alloc list events"); | |
608 | count = -ENOMEM; | |
609 | goto end; | |
610 | } | |
2ef84c95 | 611 | |
9f19cc17 | 612 | while ((size = fscanf(fp, "event { name = %m[^;]; };%n\n", &event, &pos)) == 1) { |
6725fe19 | 613 | if (count >= nbmem) { |
3b870559 MD |
614 | struct lttng_event *new_elist; |
615 | ||
ced2f820 | 616 | DBG("Reallocating event list from %zu to %zu bytes", nbmem, |
6725fe19 DG |
617 | nbmem * 2); |
618 | /* Double the size */ | |
619 | nbmem <<= 1; | |
3b870559 MD |
620 | new_elist = realloc(elist, nbmem * sizeof(struct lttng_event)); |
621 | if (new_elist == NULL) { | |
df0f840b | 622 | PERROR("realloc list events"); |
3b870559 MD |
623 | free(event); |
624 | free(elist); | |
61b73b12 MD |
625 | count = -ENOMEM; |
626 | goto end; | |
2ef84c95 | 627 | } |
3b870559 | 628 | elist = new_elist; |
2ef84c95 | 629 | } |
99497cd0 MD |
630 | strncpy(elist[count].name, event, LTTNG_SYMBOL_NAME_LEN); |
631 | elist[count].name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0'; | |
67b9d018 | 632 | elist[count].enabled = -1; |
9f19cc17 | 633 | count++; |
3b870559 | 634 | free(event); |
2ef84c95 DG |
635 | } |
636 | ||
9f19cc17 | 637 | *events = elist; |
ced2f820 | 638 | DBG("Kernel list events done (%zu events)", count); |
61b73b12 | 639 | end: |
799e2c4f MD |
640 | ret = fclose(fp); /* closes both fp and fd */ |
641 | if (ret) { | |
642 | PERROR("fclose"); | |
643 | } | |
9f19cc17 | 644 | return count; |
2ef84c95 | 645 | |
61b73b12 | 646 | error_fp: |
799e2c4f MD |
647 | ret = close(fd); |
648 | if (ret) { | |
649 | PERROR("close"); | |
650 | } | |
2ef84c95 DG |
651 | error: |
652 | return -1; | |
653 | } | |
096102bd DG |
654 | |
655 | /* | |
656 | * Get kernel version and validate it. | |
657 | */ | |
658 | int kernel_validate_version(int tracer_fd) | |
659 | { | |
660 | int ret; | |
661 | struct lttng_kernel_tracer_version version; | |
662 | ||
663 | ret = kernctl_tracer_version(tracer_fd, &version); | |
664 | if (ret < 0) { | |
665 | ERR("Failed at getting the lttng-modules version"); | |
666 | goto error; | |
667 | } | |
668 | ||
669 | /* Validate version */ | |
a62a6556 MD |
670 | if (version.major != KERN_MODULES_PRE_MAJOR |
671 | && version.major != KERN_MODULES_MAJOR) { | |
096102bd | 672 | goto error_version; |
096102bd DG |
673 | } |
674 | ||
a62a6556 | 675 | DBG2("Kernel tracer version validated (major version %d)", version.major); |
096102bd DG |
676 | return 0; |
677 | ||
678 | error_version: | |
5df0f285 | 679 | ERR("Kernel major version %d is not compatible (supporting <= %d)", |
a62a6556 | 680 | version.major, KERN_MODULES_MAJOR) |
096102bd DG |
681 | ret = -1; |
682 | ||
683 | error: | |
684 | return ret; | |
685 | } | |
335a95b7 MD |
686 | |
687 | /* | |
688 | * Kernel work-arounds called at the start of sessiond main(). | |
689 | */ | |
690 | int init_kernel_workarounds(void) | |
691 | { | |
8936c33a | 692 | int ret; |
335a95b7 MD |
693 | FILE *fp; |
694 | ||
695 | /* | |
696 | * boot_id needs to be read once before being used concurrently | |
697 | * to deal with a Linux kernel race. A fix is proposed for | |
698 | * upstream, but the work-around is needed for older kernels. | |
699 | */ | |
700 | fp = fopen("/proc/sys/kernel/random/boot_id", "r"); | |
701 | if (!fp) { | |
702 | goto end_boot_id; | |
703 | } | |
704 | while (!feof(fp)) { | |
705 | char buf[37] = ""; | |
706 | ||
8936c33a DG |
707 | ret = fread(buf, 1, sizeof(buf), fp); |
708 | if (ret < 0) { | |
709 | /* Ignore error, we don't really care */ | |
710 | } | |
335a95b7 | 711 | } |
799e2c4f MD |
712 | ret = fclose(fp); |
713 | if (ret) { | |
714 | PERROR("fclose"); | |
715 | } | |
335a95b7 | 716 | end_boot_id: |
335a95b7 MD |
717 | return 0; |
718 | } |