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 | ||
173af62f DG |
153 | DBG3("Kernel create channel %s in %s with attr: %d, %zu, %zu, %u, %u, %d", |
154 | chan->name, path, lkc->channel->attr.overwrite, | |
155 | lkc->channel->attr.subbuf_size, lkc->channel->attr.num_subbuf, | |
156 | lkc->channel->attr.switch_timer_interval, lkc->channel->attr.read_timer_interval, | |
157 | lkc->channel->attr.output); | |
158 | ||
54012638 | 159 | /* Kernel tracer channel creation */ |
f3ed775e | 160 | ret = kernctl_create_channel(session->fd, &lkc->channel->attr); |
20fe2104 | 161 | if (ret < 0) { |
df0f840b | 162 | PERROR("ioctl kernel create channel"); |
20fe2104 DG |
163 | goto error; |
164 | } | |
165 | ||
54012638 | 166 | /* Setup the channel fd */ |
20fe2104 | 167 | lkc->fd = ret; |
7b395890 DG |
168 | /* Prevent fd duplication after execlp() */ |
169 | ret = fcntl(lkc->fd, F_SETFD, FD_CLOEXEC); | |
170 | if (ret < 0) { | |
df0f840b | 171 | PERROR("fcntl session fd"); |
7b395890 DG |
172 | } |
173 | ||
54012638 | 174 | /* Add channel to session */ |
8c0faa1d DG |
175 | cds_list_add(&lkc->list, &session->channel_list.head); |
176 | session->channel_count++; | |
20fe2104 | 177 | |
00e2e675 | 178 | DBG("Kernel channel %s created (fd: %d)", lkc->channel->name, lkc->fd); |
20fe2104 DG |
179 | |
180 | return 0; | |
181 | ||
182 | error: | |
54012638 | 183 | return -1; |
20fe2104 | 184 | } |
f34daff7 DG |
185 | |
186 | /* | |
050349bb DG |
187 | * Create a kernel event, enable it to the kernel tracer and add it to the |
188 | * channel event list of the kernel session. | |
f34daff7 | 189 | */ |
050349bb DG |
190 | int kernel_create_event(struct lttng_event *ev, |
191 | struct ltt_kernel_channel *channel) | |
f34daff7 DG |
192 | { |
193 | int ret; | |
194 | struct ltt_kernel_event *event; | |
f34daff7 | 195 | |
62499ad6 | 196 | event = trace_kernel_create_event(ev); |
54012638 | 197 | if (event == NULL) { |
d87bfb32 | 198 | ret = -1; |
f34daff7 DG |
199 | goto error; |
200 | } | |
201 | ||
f3ed775e DG |
202 | ret = kernctl_create_event(channel->fd, event->event); |
203 | if (ret < 0) { | |
bd29c13d DG |
204 | switch (errno) { |
205 | case EEXIST: | |
206 | break; | |
207 | case ENOSYS: | |
208 | WARN("Event type not implemented"); | |
209 | break; | |
210 | default: | |
d87bfb32 DG |
211 | PERROR("create event ioctl"); |
212 | } | |
213 | ret = -errno; | |
e953ef25 | 214 | goto free_event; |
8c0faa1d | 215 | } |
f34daff7 | 216 | |
5f822d0a | 217 | /* |
2c425ff7 | 218 | * LTTNG_KERNEL_SYSCALL event creation will return 0 on success. |
5f822d0a DG |
219 | */ |
220 | if (ret == 0 && event->event->instrumentation == LTTNG_KERNEL_SYSCALL) { | |
221 | DBG2("Kernel event syscall creation success"); | |
87eb4ab8 MD |
222 | /* |
223 | * We use fd == -1 to ensure that we never trigger a close of fd | |
224 | * 0. | |
225 | */ | |
226 | event->fd = -1; | |
2c425ff7 | 227 | goto add_list; |
5f822d0a DG |
228 | } |
229 | ||
f3ed775e | 230 | event->fd = ret; |
7b395890 DG |
231 | /* Prevent fd duplication after execlp() */ |
232 | ret = fcntl(event->fd, F_SETFD, FD_CLOEXEC); | |
233 | if (ret < 0) { | |
df0f840b | 234 | PERROR("fcntl session fd"); |
7b395890 DG |
235 | } |
236 | ||
2c425ff7 | 237 | add_list: |
f3ed775e DG |
238 | /* Add event to event list */ |
239 | cds_list_add(&event->list, &channel->events_list.head); | |
cbbbb275 DG |
240 | channel->event_count++; |
241 | ||
e953ef25 DG |
242 | DBG("Event %s created (fd: %d)", ev->name, event->fd); |
243 | ||
244 | return 0; | |
245 | ||
246 | free_event: | |
247 | free(event); | |
248 | error: | |
d87bfb32 | 249 | return ret; |
e953ef25 DG |
250 | } |
251 | ||
26cc6b4e | 252 | /* |
050349bb | 253 | * Disable a kernel channel. |
26cc6b4e DG |
254 | */ |
255 | int kernel_disable_channel(struct ltt_kernel_channel *chan) | |
256 | { | |
257 | int ret; | |
258 | ||
259 | ret = kernctl_disable(chan->fd); | |
260 | if (ret < 0) { | |
df0f840b | 261 | PERROR("disable chan ioctl"); |
26cc6b4e DG |
262 | ret = errno; |
263 | goto error; | |
264 | } | |
265 | ||
266 | chan->enabled = 0; | |
267 | DBG("Kernel channel %s disabled (fd: %d)", chan->channel->name, chan->fd); | |
268 | ||
269 | return 0; | |
270 | ||
271 | error: | |
272 | return ret; | |
273 | } | |
274 | ||
d36b8583 | 275 | /* |
050349bb | 276 | * Enable a kernel channel. |
d36b8583 DG |
277 | */ |
278 | int kernel_enable_channel(struct ltt_kernel_channel *chan) | |
279 | { | |
280 | int ret; | |
281 | ||
282 | ret = kernctl_enable(chan->fd); | |
54d01ffb | 283 | if (ret < 0 && errno != EEXIST) { |
df0f840b | 284 | PERROR("Enable kernel chan"); |
d36b8583 DG |
285 | goto error; |
286 | } | |
287 | ||
288 | chan->enabled = 1; | |
289 | DBG("Kernel channel %s enabled (fd: %d)", chan->channel->name, chan->fd); | |
290 | ||
291 | return 0; | |
292 | ||
293 | error: | |
294 | return ret; | |
295 | } | |
296 | ||
19e70852 | 297 | /* |
050349bb | 298 | * Enable a kernel event. |
19e70852 DG |
299 | */ |
300 | int kernel_enable_event(struct ltt_kernel_event *event) | |
301 | { | |
302 | int ret; | |
303 | ||
304 | ret = kernctl_enable(event->fd); | |
42224349 DG |
305 | if (ret < 0) { |
306 | switch (errno) { | |
307 | case EEXIST: | |
308 | ret = LTTCOMM_KERN_EVENT_EXIST; | |
309 | break; | |
310 | default: | |
311 | PERROR("enable kernel event"); | |
312 | break; | |
313 | } | |
19e70852 DG |
314 | goto error; |
315 | } | |
316 | ||
317 | event->enabled = 1; | |
318 | DBG("Kernel event %s enabled (fd: %d)", event->event->name, event->fd); | |
319 | ||
320 | return 0; | |
321 | ||
322 | error: | |
d36b8583 | 323 | return ret; |
19e70852 DG |
324 | } |
325 | ||
e953ef25 | 326 | /* |
050349bb | 327 | * Disable a kernel event. |
e953ef25 | 328 | */ |
19e70852 | 329 | int kernel_disable_event(struct ltt_kernel_event *event) |
e953ef25 DG |
330 | { |
331 | int ret; | |
19e70852 DG |
332 | |
333 | ret = kernctl_disable(event->fd); | |
42224349 DG |
334 | if (ret < 0) { |
335 | switch (errno) { | |
336 | case EEXIST: | |
337 | ret = LTTCOMM_KERN_EVENT_EXIST; | |
338 | break; | |
339 | default: | |
340 | PERROR("disable kernel event"); | |
341 | break; | |
342 | } | |
19e70852 | 343 | goto error; |
e953ef25 | 344 | } |
f3ed775e | 345 | |
19e70852 DG |
346 | event->enabled = 0; |
347 | DBG("Kernel event %s disabled (fd: %d)", event->event->name, event->fd); | |
348 | ||
f34daff7 DG |
349 | return 0; |
350 | ||
351 | error: | |
d36b8583 | 352 | return ret; |
f34daff7 | 353 | } |
aaf26714 DG |
354 | |
355 | /* | |
050349bb DG |
356 | * Create kernel metadata, open from the kernel tracer and add it to the |
357 | * kernel session. | |
aaf26714 | 358 | */ |
58a97671 | 359 | int kernel_open_metadata(struct ltt_kernel_session *session, char *path) |
aaf26714 DG |
360 | { |
361 | int ret; | |
362 | struct ltt_kernel_metadata *lkm; | |
aaf26714 | 363 | |
54012638 | 364 | /* Allocate kernel metadata */ |
62499ad6 | 365 | lkm = trace_kernel_create_metadata(path); |
54012638 | 366 | if (lkm == NULL) { |
aaf26714 DG |
367 | goto error; |
368 | } | |
369 | ||
54012638 | 370 | /* Kernel tracer metadata creation */ |
f3ed775e | 371 | ret = kernctl_open_metadata(session->fd, &lkm->conf->attr); |
aaf26714 DG |
372 | if (ret < 0) { |
373 | goto error; | |
374 | } | |
375 | ||
8c0faa1d | 376 | lkm->fd = ret; |
7b395890 DG |
377 | /* Prevent fd duplication after execlp() */ |
378 | ret = fcntl(lkm->fd, F_SETFD, FD_CLOEXEC); | |
379 | if (ret < 0) { | |
df0f840b | 380 | PERROR("fcntl session fd"); |
7b395890 DG |
381 | } |
382 | ||
aaf26714 | 383 | session->metadata = lkm; |
8c0faa1d | 384 | |
00e2e675 | 385 | DBG("Kernel metadata opened (fd: %d)", lkm->fd); |
8c0faa1d DG |
386 | |
387 | return 0; | |
388 | ||
389 | error: | |
54012638 | 390 | return -1; |
8c0faa1d DG |
391 | } |
392 | ||
393 | /* | |
050349bb | 394 | * Start tracing session. |
8c0faa1d DG |
395 | */ |
396 | int kernel_start_session(struct ltt_kernel_session *session) | |
397 | { | |
398 | int ret; | |
399 | ||
400 | ret = kernctl_start_session(session->fd); | |
401 | if (ret < 0) { | |
df0f840b | 402 | PERROR("ioctl start session"); |
8c0faa1d DG |
403 | goto error; |
404 | } | |
405 | ||
406 | DBG("Kernel session started"); | |
407 | ||
408 | return 0; | |
409 | ||
410 | error: | |
411 | return ret; | |
412 | } | |
413 | ||
f3ed775e | 414 | /* |
050349bb | 415 | * Make a kernel wait to make sure in-flight probe have completed. |
f3ed775e DG |
416 | */ |
417 | void kernel_wait_quiescent(int fd) | |
418 | { | |
419 | int ret; | |
420 | ||
421 | DBG("Kernel quiescent wait on %d", fd); | |
422 | ||
423 | ret = kernctl_wait_quiescent(fd); | |
424 | if (ret < 0) { | |
df0f840b | 425 | PERROR("wait quiescent ioctl"); |
f3ed775e DG |
426 | ERR("Kernel quiescent wait failed"); |
427 | } | |
428 | } | |
429 | ||
d0254c7c | 430 | /* |
050349bb | 431 | * Kernel calibrate |
d0254c7c MD |
432 | */ |
433 | int kernel_calibrate(int fd, struct lttng_kernel_calibrate *calibrate) | |
434 | { | |
435 | int ret; | |
436 | ||
437 | ret = kernctl_calibrate(fd, calibrate); | |
438 | if (ret < 0) { | |
df0f840b | 439 | PERROR("calibrate ioctl"); |
d0254c7c MD |
440 | return -1; |
441 | } | |
442 | ||
443 | return 0; | |
444 | } | |
445 | ||
446 | ||
f3ed775e | 447 | /* |
f3ed775e DG |
448 | * Force flush buffer of metadata. |
449 | */ | |
450 | int kernel_metadata_flush_buffer(int fd) | |
451 | { | |
452 | int ret; | |
453 | ||
454 | ret = kernctl_buffer_flush(fd); | |
455 | if (ret < 0) { | |
00e2e675 | 456 | ERR("Fail to flush metadata buffers %d (ret: %d)", fd, ret); |
f3ed775e DG |
457 | } |
458 | ||
459 | return 0; | |
460 | } | |
461 | ||
462 | /* | |
050349bb | 463 | * Force flush buffer for channel. |
f3ed775e DG |
464 | */ |
465 | int kernel_flush_buffer(struct ltt_kernel_channel *channel) | |
466 | { | |
467 | int ret; | |
468 | struct ltt_kernel_stream *stream; | |
469 | ||
470 | DBG("Flush buffer for channel %s", channel->channel->name); | |
471 | ||
472 | cds_list_for_each_entry(stream, &channel->stream_list.head, list) { | |
473 | DBG("Flushing channel stream %d", stream->fd); | |
474 | ret = kernctl_buffer_flush(stream->fd); | |
475 | if (ret < 0) { | |
df0f840b | 476 | PERROR("ioctl"); |
f3ed775e DG |
477 | ERR("Fail to flush buffer for stream %d (ret: %d)", |
478 | stream->fd, ret); | |
479 | } | |
480 | } | |
481 | ||
482 | return 0; | |
483 | } | |
484 | ||
8c0faa1d | 485 | /* |
050349bb | 486 | * Stop tracing session. |
8c0faa1d DG |
487 | */ |
488 | int kernel_stop_session(struct ltt_kernel_session *session) | |
489 | { | |
490 | int ret; | |
491 | ||
492 | ret = kernctl_stop_session(session->fd); | |
493 | if (ret < 0) { | |
494 | goto error; | |
495 | } | |
496 | ||
497 | DBG("Kernel session stopped"); | |
498 | ||
499 | return 0; | |
500 | ||
501 | error: | |
502 | return ret; | |
503 | } | |
504 | ||
505 | /* | |
050349bb DG |
506 | * Open stream of channel, register it to the kernel tracer and add it |
507 | * to the stream list of the channel. | |
8c0faa1d | 508 | * |
050349bb | 509 | * Return the number of created stream. Else, a negative value. |
8c0faa1d | 510 | */ |
f3ed775e | 511 | int kernel_open_channel_stream(struct ltt_kernel_channel *channel) |
8c0faa1d | 512 | { |
00e2e675 | 513 | int ret, count = 0; |
8c0faa1d DG |
514 | struct ltt_kernel_stream *lks; |
515 | ||
5a47c6a2 | 516 | while ((ret = kernctl_create_stream(channel->fd)) >= 0) { |
00e2e675 | 517 | lks = trace_kernel_create_stream(channel->channel->name, count); |
8c0faa1d | 518 | if (lks == NULL) { |
799e2c4f MD |
519 | ret = close(ret); |
520 | if (ret) { | |
521 | PERROR("close"); | |
522 | } | |
8c0faa1d DG |
523 | goto error; |
524 | } | |
525 | ||
526 | lks->fd = ret; | |
7b395890 DG |
527 | /* Prevent fd duplication after execlp() */ |
528 | ret = fcntl(lks->fd, F_SETFD, FD_CLOEXEC); | |
529 | if (ret < 0) { | |
df0f840b | 530 | PERROR("fcntl session fd"); |
7b395890 DG |
531 | } |
532 | ||
54012638 | 533 | /* Add stream to channe stream list */ |
8c0faa1d DG |
534 | cds_list_add(&lks->list, &channel->stream_list.head); |
535 | channel->stream_count++; | |
8c0faa1d | 536 | |
00e2e675 DG |
537 | /* Increment counter which represent CPU number. */ |
538 | count++; | |
539 | ||
540 | DBG("Kernel stream %s created (fd: %d, state: %d)", lks->name, lks->fd, | |
541 | lks->state); | |
54012638 | 542 | } |
8c0faa1d DG |
543 | |
544 | return channel->stream_count; | |
545 | ||
546 | error: | |
54012638 | 547 | return -1; |
8c0faa1d DG |
548 | } |
549 | ||
550 | /* | |
050349bb | 551 | * Open the metadata stream and set it to the kernel session. |
8c0faa1d | 552 | */ |
f3ed775e | 553 | int kernel_open_metadata_stream(struct ltt_kernel_session *session) |
8c0faa1d DG |
554 | { |
555 | int ret; | |
556 | ||
557 | ret = kernctl_create_stream(session->metadata->fd); | |
558 | if (ret < 0) { | |
df0f840b | 559 | PERROR("kernel create metadata stream"); |
8c0faa1d DG |
560 | goto error; |
561 | } | |
562 | ||
563 | DBG("Kernel metadata stream created (fd: %d)", ret); | |
564 | session->metadata_stream_fd = ret; | |
7b395890 DG |
565 | /* Prevent fd duplication after execlp() */ |
566 | ret = fcntl(session->metadata_stream_fd, F_SETFD, FD_CLOEXEC); | |
567 | if (ret < 0) { | |
df0f840b | 568 | PERROR("fcntl session fd"); |
7b395890 | 569 | } |
aaf26714 DG |
570 | |
571 | return 0; | |
572 | ||
573 | error: | |
54012638 | 574 | return -1; |
aaf26714 | 575 | } |
2ef84c95 DG |
576 | |
577 | /* | |
9f19cc17 | 578 | * Get the event list from the kernel tracer and return the number of elements. |
2ef84c95 | 579 | */ |
9f19cc17 | 580 | ssize_t kernel_list_events(int tracer_fd, struct lttng_event **events) |
2ef84c95 | 581 | { |
799e2c4f | 582 | int fd, pos, ret; |
9f19cc17 DG |
583 | char *event; |
584 | size_t nbmem, count = 0; | |
2ef84c95 DG |
585 | ssize_t size; |
586 | FILE *fp; | |
9f19cc17 | 587 | struct lttng_event *elist; |
2ef84c95 DG |
588 | |
589 | fd = kernctl_tracepoint_list(tracer_fd); | |
590 | if (fd < 0) { | |
df0f840b | 591 | PERROR("kernel tracepoint list"); |
2ef84c95 DG |
592 | goto error; |
593 | } | |
594 | ||
595 | fp = fdopen(fd, "r"); | |
596 | if (fp == NULL) { | |
df0f840b | 597 | PERROR("kernel tracepoint list fdopen"); |
61b73b12 | 598 | goto error_fp; |
2ef84c95 DG |
599 | } |
600 | ||
601 | /* | |
602 | * Init memory size counter | |
603 | * See kernel-ctl.h for explanation of this value | |
604 | */ | |
6725fe19 | 605 | nbmem = KERNEL_EVENT_INIT_LIST_SIZE; |
ba7f0ae5 | 606 | elist = zmalloc(sizeof(struct lttng_event) * nbmem); |
3b870559 MD |
607 | if (elist == NULL) { |
608 | PERROR("alloc list events"); | |
609 | count = -ENOMEM; | |
610 | goto end; | |
611 | } | |
2ef84c95 | 612 | |
9f19cc17 | 613 | while ((size = fscanf(fp, "event { name = %m[^;]; };%n\n", &event, &pos)) == 1) { |
6725fe19 | 614 | if (count >= nbmem) { |
3b870559 MD |
615 | struct lttng_event *new_elist; |
616 | ||
ced2f820 | 617 | DBG("Reallocating event list from %zu to %zu bytes", nbmem, |
6725fe19 DG |
618 | nbmem * 2); |
619 | /* Double the size */ | |
620 | nbmem <<= 1; | |
3b870559 MD |
621 | new_elist = realloc(elist, nbmem * sizeof(struct lttng_event)); |
622 | if (new_elist == NULL) { | |
df0f840b | 623 | PERROR("realloc list events"); |
3b870559 MD |
624 | free(event); |
625 | free(elist); | |
61b73b12 MD |
626 | count = -ENOMEM; |
627 | goto end; | |
2ef84c95 | 628 | } |
3b870559 | 629 | elist = new_elist; |
2ef84c95 | 630 | } |
99497cd0 MD |
631 | strncpy(elist[count].name, event, LTTNG_SYMBOL_NAME_LEN); |
632 | elist[count].name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0'; | |
67b9d018 | 633 | elist[count].enabled = -1; |
9f19cc17 | 634 | count++; |
3b870559 | 635 | free(event); |
2ef84c95 DG |
636 | } |
637 | ||
9f19cc17 | 638 | *events = elist; |
ced2f820 | 639 | DBG("Kernel list events done (%zu events)", count); |
61b73b12 | 640 | end: |
799e2c4f MD |
641 | ret = fclose(fp); /* closes both fp and fd */ |
642 | if (ret) { | |
643 | PERROR("fclose"); | |
644 | } | |
9f19cc17 | 645 | return count; |
2ef84c95 | 646 | |
61b73b12 | 647 | error_fp: |
799e2c4f MD |
648 | ret = close(fd); |
649 | if (ret) { | |
650 | PERROR("close"); | |
651 | } | |
2ef84c95 DG |
652 | error: |
653 | return -1; | |
654 | } | |
096102bd DG |
655 | |
656 | /* | |
657 | * Get kernel version and validate it. | |
658 | */ | |
659 | int kernel_validate_version(int tracer_fd) | |
660 | { | |
661 | int ret; | |
662 | struct lttng_kernel_tracer_version version; | |
663 | ||
664 | ret = kernctl_tracer_version(tracer_fd, &version); | |
665 | if (ret < 0) { | |
666 | ERR("Failed at getting the lttng-modules version"); | |
667 | goto error; | |
668 | } | |
669 | ||
670 | /* Validate version */ | |
a62a6556 MD |
671 | if (version.major != KERN_MODULES_PRE_MAJOR |
672 | && version.major != KERN_MODULES_MAJOR) { | |
096102bd | 673 | goto error_version; |
096102bd DG |
674 | } |
675 | ||
a62a6556 | 676 | DBG2("Kernel tracer version validated (major version %d)", version.major); |
096102bd DG |
677 | return 0; |
678 | ||
679 | error_version: | |
5df0f285 | 680 | ERR("Kernel major version %d is not compatible (supporting <= %d)", |
a62a6556 | 681 | version.major, KERN_MODULES_MAJOR) |
096102bd DG |
682 | ret = -1; |
683 | ||
684 | error: | |
685 | return ret; | |
686 | } | |
335a95b7 MD |
687 | |
688 | /* | |
689 | * Kernel work-arounds called at the start of sessiond main(). | |
690 | */ | |
691 | int init_kernel_workarounds(void) | |
692 | { | |
8936c33a | 693 | int ret; |
335a95b7 MD |
694 | FILE *fp; |
695 | ||
696 | /* | |
697 | * boot_id needs to be read once before being used concurrently | |
698 | * to deal with a Linux kernel race. A fix is proposed for | |
699 | * upstream, but the work-around is needed for older kernels. | |
700 | */ | |
701 | fp = fopen("/proc/sys/kernel/random/boot_id", "r"); | |
702 | if (!fp) { | |
703 | goto end_boot_id; | |
704 | } | |
705 | while (!feof(fp)) { | |
706 | char buf[37] = ""; | |
707 | ||
8936c33a DG |
708 | ret = fread(buf, 1, sizeof(buf), fp); |
709 | if (ret < 0) { | |
710 | /* Ignore error, we don't really care */ | |
711 | } | |
335a95b7 | 712 | } |
799e2c4f MD |
713 | ret = fclose(fp); |
714 | if (ret) { | |
715 | PERROR("fclose"); | |
716 | } | |
335a95b7 | 717 | end_boot_id: |
335a95b7 MD |
718 | return 0; |
719 | } |