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> |
77c7c900 | 25 | #include <inttypes.h> |
20fe2104 | 26 | |
990570ed | 27 | #include <common/common.h> |
db758600 | 28 | #include <common/kernel-ctl/kernel-ctl.h> |
42224349 | 29 | #include <common/sessiond-comm/sessiond-comm.h> |
1e307fab | 30 | |
4771f025 | 31 | #include "kernel.h" |
096102bd | 32 | #include "kern-modules.h" |
20fe2104 | 33 | |
d65106b1 | 34 | /* |
050349bb | 35 | * Add context on a kernel channel. |
d65106b1 DG |
36 | */ |
37 | int kernel_add_channel_context(struct ltt_kernel_channel *chan, | |
38 | struct lttng_kernel_context *ctx) | |
39 | { | |
40 | int ret; | |
41 | ||
42 | DBG("Adding context to channel %s", chan->channel->name); | |
43 | ret = kernctl_add_context(chan->fd, ctx); | |
44 | if (ret < 0) { | |
b579acd9 | 45 | if (errno != EEXIST) { |
df0f840b | 46 | PERROR("add context ioctl"); |
b579acd9 DG |
47 | } else { |
48 | /* If EEXIST, we just ignore the error */ | |
49 | ret = 0; | |
50 | } | |
d65106b1 DG |
51 | goto error; |
52 | } | |
53 | ||
ba7f0ae5 | 54 | chan->ctx = zmalloc(sizeof(struct lttng_kernel_context)); |
d65106b1 | 55 | if (chan->ctx == NULL) { |
df0f840b | 56 | PERROR("zmalloc event context"); |
d65106b1 DG |
57 | goto error; |
58 | } | |
59 | ||
60 | memcpy(chan->ctx, ctx, sizeof(struct lttng_kernel_context)); | |
61 | ||
62 | return 0; | |
63 | ||
64 | error: | |
65 | return ret; | |
66 | } | |
67 | ||
68 | /* | |
050349bb | 69 | * Add context on a kernel event. |
d65106b1 DG |
70 | */ |
71 | int kernel_add_event_context(struct ltt_kernel_event *event, | |
72 | struct lttng_kernel_context *ctx) | |
73 | { | |
74 | int ret; | |
75 | ||
76 | DBG("Adding context to event %s", event->event->name); | |
77 | ret = kernctl_add_context(event->fd, ctx); | |
78 | if (ret < 0) { | |
df0f840b | 79 | PERROR("add context ioctl"); |
d65106b1 DG |
80 | goto error; |
81 | } | |
82 | ||
ba7f0ae5 | 83 | event->ctx = zmalloc(sizeof(struct lttng_kernel_context)); |
d65106b1 | 84 | if (event->ctx == NULL) { |
df0f840b | 85 | PERROR("zmalloc event context"); |
d65106b1 DG |
86 | goto error; |
87 | } | |
88 | ||
89 | memcpy(event->ctx, ctx, sizeof(struct lttng_kernel_context)); | |
90 | ||
91 | return 0; | |
92 | ||
93 | error: | |
94 | return ret; | |
95 | } | |
96 | ||
20fe2104 | 97 | /* |
050349bb DG |
98 | * Create a new kernel session, register it to the kernel tracer and add it to |
99 | * the session daemon session. | |
20fe2104 | 100 | */ |
8c0faa1d | 101 | int kernel_create_session(struct ltt_session *session, int tracer_fd) |
20fe2104 DG |
102 | { |
103 | int ret; | |
104 | struct ltt_kernel_session *lks; | |
105 | ||
54012638 | 106 | /* Allocate data structure */ |
f9815039 | 107 | lks = trace_kernel_create_session(session->path); |
20fe2104 | 108 | if (lks == NULL) { |
54012638 | 109 | ret = -1; |
20fe2104 DG |
110 | goto error; |
111 | } | |
112 | ||
54012638 | 113 | /* Kernel tracer session creation */ |
20fe2104 DG |
114 | ret = kernctl_create_session(tracer_fd); |
115 | if (ret < 0) { | |
df0f840b | 116 | PERROR("ioctl kernel create session"); |
20fe2104 DG |
117 | goto error; |
118 | } | |
119 | ||
20fe2104 | 120 | lks->fd = ret; |
7b395890 DG |
121 | /* Prevent fd duplication after execlp() */ |
122 | ret = fcntl(lks->fd, F_SETFD, FD_CLOEXEC); | |
123 | if (ret < 0) { | |
df0f840b | 124 | PERROR("fcntl session fd"); |
7b395890 DG |
125 | } |
126 | ||
3bd1e081 | 127 | lks->consumer_fds_sent = 0; |
8c0faa1d | 128 | session->kernel_session = lks; |
8c0faa1d DG |
129 | |
130 | DBG("Kernel session created (fd: %d)", lks->fd); | |
20fe2104 DG |
131 | |
132 | return 0; | |
133 | ||
134 | error: | |
135 | return ret; | |
136 | } | |
137 | ||
138 | /* | |
050349bb DG |
139 | * Create a kernel channel, register it to the kernel tracer and add it to the |
140 | * kernel session. | |
20fe2104 | 141 | */ |
050349bb DG |
142 | int kernel_create_channel(struct ltt_kernel_session *session, |
143 | struct lttng_channel *chan, char *path) | |
20fe2104 DG |
144 | { |
145 | int ret; | |
146 | struct ltt_kernel_channel *lkc; | |
20fe2104 | 147 | |
54012638 | 148 | /* Allocate kernel channel */ |
62499ad6 | 149 | lkc = trace_kernel_create_channel(chan, path); |
54012638 | 150 | if (lkc == NULL) { |
20fe2104 DG |
151 | goto error; |
152 | } | |
153 | ||
77c7c900 | 154 | DBG3("Kernel create channel %s in %s with attr: %d, %" PRIu64 ", %" PRIu64 ", %u, %u, %d", |
173af62f DG |
155 | chan->name, path, lkc->channel->attr.overwrite, |
156 | lkc->channel->attr.subbuf_size, lkc->channel->attr.num_subbuf, | |
157 | lkc->channel->attr.switch_timer_interval, lkc->channel->attr.read_timer_interval, | |
158 | lkc->channel->attr.output); | |
159 | ||
54012638 | 160 | /* Kernel tracer channel creation */ |
f3ed775e | 161 | ret = kernctl_create_channel(session->fd, &lkc->channel->attr); |
20fe2104 | 162 | if (ret < 0) { |
df0f840b | 163 | PERROR("ioctl kernel create channel"); |
20fe2104 DG |
164 | goto error; |
165 | } | |
166 | ||
54012638 | 167 | /* Setup the channel fd */ |
20fe2104 | 168 | lkc->fd = ret; |
7b395890 DG |
169 | /* Prevent fd duplication after execlp() */ |
170 | ret = fcntl(lkc->fd, F_SETFD, FD_CLOEXEC); | |
171 | if (ret < 0) { | |
df0f840b | 172 | PERROR("fcntl session fd"); |
7b395890 DG |
173 | } |
174 | ||
54012638 | 175 | /* Add channel to session */ |
8c0faa1d DG |
176 | cds_list_add(&lkc->list, &session->channel_list.head); |
177 | session->channel_count++; | |
20fe2104 | 178 | |
00e2e675 | 179 | DBG("Kernel channel %s created (fd: %d)", lkc->channel->name, lkc->fd); |
20fe2104 DG |
180 | |
181 | return 0; | |
182 | ||
183 | error: | |
54012638 | 184 | return -1; |
20fe2104 | 185 | } |
f34daff7 DG |
186 | |
187 | /* | |
050349bb DG |
188 | * Create a kernel event, enable it to the kernel tracer and add it to the |
189 | * channel event list of the kernel session. | |
f34daff7 | 190 | */ |
050349bb DG |
191 | int kernel_create_event(struct lttng_event *ev, |
192 | struct ltt_kernel_channel *channel) | |
f34daff7 DG |
193 | { |
194 | int ret; | |
195 | struct ltt_kernel_event *event; | |
f34daff7 | 196 | |
62499ad6 | 197 | event = trace_kernel_create_event(ev); |
54012638 | 198 | if (event == NULL) { |
d87bfb32 | 199 | ret = -1; |
f34daff7 DG |
200 | goto error; |
201 | } | |
202 | ||
f3ed775e DG |
203 | ret = kernctl_create_event(channel->fd, event->event); |
204 | if (ret < 0) { | |
bd29c13d DG |
205 | switch (errno) { |
206 | case EEXIST: | |
207 | break; | |
208 | case ENOSYS: | |
209 | WARN("Event type not implemented"); | |
210 | break; | |
211 | default: | |
d87bfb32 DG |
212 | PERROR("create event ioctl"); |
213 | } | |
214 | ret = -errno; | |
e953ef25 | 215 | goto free_event; |
8c0faa1d | 216 | } |
f34daff7 | 217 | |
5f822d0a | 218 | /* |
2c425ff7 | 219 | * LTTNG_KERNEL_SYSCALL event creation will return 0 on success. |
5f822d0a DG |
220 | */ |
221 | if (ret == 0 && event->event->instrumentation == LTTNG_KERNEL_SYSCALL) { | |
222 | DBG2("Kernel event syscall creation success"); | |
87eb4ab8 MD |
223 | /* |
224 | * We use fd == -1 to ensure that we never trigger a close of fd | |
225 | * 0. | |
226 | */ | |
227 | event->fd = -1; | |
2c425ff7 | 228 | goto add_list; |
5f822d0a DG |
229 | } |
230 | ||
f3ed775e | 231 | event->fd = ret; |
7b395890 DG |
232 | /* Prevent fd duplication after execlp() */ |
233 | ret = fcntl(event->fd, F_SETFD, FD_CLOEXEC); | |
234 | if (ret < 0) { | |
df0f840b | 235 | PERROR("fcntl session fd"); |
7b395890 DG |
236 | } |
237 | ||
2c425ff7 | 238 | add_list: |
f3ed775e DG |
239 | /* Add event to event list */ |
240 | cds_list_add(&event->list, &channel->events_list.head); | |
cbbbb275 DG |
241 | channel->event_count++; |
242 | ||
e953ef25 DG |
243 | DBG("Event %s created (fd: %d)", ev->name, event->fd); |
244 | ||
245 | return 0; | |
246 | ||
247 | free_event: | |
248 | free(event); | |
249 | error: | |
d87bfb32 | 250 | return ret; |
e953ef25 DG |
251 | } |
252 | ||
26cc6b4e | 253 | /* |
050349bb | 254 | * Disable a kernel channel. |
26cc6b4e DG |
255 | */ |
256 | int kernel_disable_channel(struct ltt_kernel_channel *chan) | |
257 | { | |
258 | int ret; | |
259 | ||
260 | ret = kernctl_disable(chan->fd); | |
261 | if (ret < 0) { | |
df0f840b | 262 | PERROR("disable chan ioctl"); |
26cc6b4e DG |
263 | ret = errno; |
264 | goto error; | |
265 | } | |
266 | ||
267 | chan->enabled = 0; | |
268 | DBG("Kernel channel %s disabled (fd: %d)", chan->channel->name, chan->fd); | |
269 | ||
270 | return 0; | |
271 | ||
272 | error: | |
273 | return ret; | |
274 | } | |
275 | ||
d36b8583 | 276 | /* |
050349bb | 277 | * Enable a kernel channel. |
d36b8583 DG |
278 | */ |
279 | int kernel_enable_channel(struct ltt_kernel_channel *chan) | |
280 | { | |
281 | int ret; | |
282 | ||
283 | ret = kernctl_enable(chan->fd); | |
54d01ffb | 284 | if (ret < 0 && errno != EEXIST) { |
df0f840b | 285 | PERROR("Enable kernel chan"); |
d36b8583 DG |
286 | goto error; |
287 | } | |
288 | ||
289 | chan->enabled = 1; | |
290 | DBG("Kernel channel %s enabled (fd: %d)", chan->channel->name, chan->fd); | |
291 | ||
292 | return 0; | |
293 | ||
294 | error: | |
295 | return ret; | |
296 | } | |
297 | ||
19e70852 | 298 | /* |
050349bb | 299 | * Enable a kernel event. |
19e70852 DG |
300 | */ |
301 | int kernel_enable_event(struct ltt_kernel_event *event) | |
302 | { | |
303 | int ret; | |
304 | ||
305 | ret = kernctl_enable(event->fd); | |
42224349 DG |
306 | if (ret < 0) { |
307 | switch (errno) { | |
308 | case EEXIST: | |
309 | ret = LTTCOMM_KERN_EVENT_EXIST; | |
310 | break; | |
311 | default: | |
312 | PERROR("enable kernel event"); | |
313 | break; | |
314 | } | |
19e70852 DG |
315 | goto error; |
316 | } | |
317 | ||
318 | event->enabled = 1; | |
319 | DBG("Kernel event %s enabled (fd: %d)", event->event->name, event->fd); | |
320 | ||
321 | return 0; | |
322 | ||
323 | error: | |
d36b8583 | 324 | return ret; |
19e70852 DG |
325 | } |
326 | ||
e953ef25 | 327 | /* |
050349bb | 328 | * Disable a kernel event. |
e953ef25 | 329 | */ |
19e70852 | 330 | int kernel_disable_event(struct ltt_kernel_event *event) |
e953ef25 DG |
331 | { |
332 | int ret; | |
19e70852 DG |
333 | |
334 | ret = kernctl_disable(event->fd); | |
42224349 DG |
335 | if (ret < 0) { |
336 | switch (errno) { | |
337 | case EEXIST: | |
338 | ret = LTTCOMM_KERN_EVENT_EXIST; | |
339 | break; | |
340 | default: | |
341 | PERROR("disable kernel event"); | |
342 | break; | |
343 | } | |
19e70852 | 344 | goto error; |
e953ef25 | 345 | } |
f3ed775e | 346 | |
19e70852 DG |
347 | event->enabled = 0; |
348 | DBG("Kernel event %s disabled (fd: %d)", event->event->name, event->fd); | |
349 | ||
f34daff7 DG |
350 | return 0; |
351 | ||
352 | error: | |
d36b8583 | 353 | return ret; |
f34daff7 | 354 | } |
aaf26714 DG |
355 | |
356 | /* | |
050349bb DG |
357 | * Create kernel metadata, open from the kernel tracer and add it to the |
358 | * kernel session. | |
aaf26714 | 359 | */ |
a4b92340 | 360 | int kernel_open_metadata(struct ltt_kernel_session *session) |
aaf26714 DG |
361 | { |
362 | int ret; | |
363 | struct ltt_kernel_metadata *lkm; | |
aaf26714 | 364 | |
54012638 | 365 | /* Allocate kernel metadata */ |
a4b92340 | 366 | lkm = trace_kernel_create_metadata(); |
54012638 | 367 | if (lkm == NULL) { |
aaf26714 DG |
368 | goto error; |
369 | } | |
370 | ||
54012638 | 371 | /* Kernel tracer metadata creation */ |
f3ed775e | 372 | ret = kernctl_open_metadata(session->fd, &lkm->conf->attr); |
aaf26714 DG |
373 | if (ret < 0) { |
374 | goto error; | |
375 | } | |
376 | ||
8c0faa1d | 377 | lkm->fd = ret; |
7b395890 DG |
378 | /* Prevent fd duplication after execlp() */ |
379 | ret = fcntl(lkm->fd, F_SETFD, FD_CLOEXEC); | |
380 | if (ret < 0) { | |
df0f840b | 381 | PERROR("fcntl session fd"); |
7b395890 DG |
382 | } |
383 | ||
aaf26714 | 384 | session->metadata = lkm; |
8c0faa1d | 385 | |
00e2e675 | 386 | DBG("Kernel metadata opened (fd: %d)", lkm->fd); |
8c0faa1d DG |
387 | |
388 | return 0; | |
389 | ||
390 | error: | |
54012638 | 391 | return -1; |
8c0faa1d DG |
392 | } |
393 | ||
394 | /* | |
050349bb | 395 | * Start tracing session. |
8c0faa1d DG |
396 | */ |
397 | int kernel_start_session(struct ltt_kernel_session *session) | |
398 | { | |
399 | int ret; | |
400 | ||
401 | ret = kernctl_start_session(session->fd); | |
402 | if (ret < 0) { | |
df0f840b | 403 | PERROR("ioctl start session"); |
8c0faa1d DG |
404 | goto error; |
405 | } | |
406 | ||
407 | DBG("Kernel session started"); | |
408 | ||
409 | return 0; | |
410 | ||
411 | error: | |
412 | return ret; | |
413 | } | |
414 | ||
f3ed775e | 415 | /* |
050349bb | 416 | * Make a kernel wait to make sure in-flight probe have completed. |
f3ed775e DG |
417 | */ |
418 | void kernel_wait_quiescent(int fd) | |
419 | { | |
420 | int ret; | |
421 | ||
422 | DBG("Kernel quiescent wait on %d", fd); | |
423 | ||
424 | ret = kernctl_wait_quiescent(fd); | |
425 | if (ret < 0) { | |
df0f840b | 426 | PERROR("wait quiescent ioctl"); |
f3ed775e DG |
427 | ERR("Kernel quiescent wait failed"); |
428 | } | |
429 | } | |
430 | ||
d0254c7c | 431 | /* |
050349bb | 432 | * Kernel calibrate |
d0254c7c MD |
433 | */ |
434 | int kernel_calibrate(int fd, struct lttng_kernel_calibrate *calibrate) | |
435 | { | |
436 | int ret; | |
437 | ||
438 | ret = kernctl_calibrate(fd, calibrate); | |
439 | if (ret < 0) { | |
df0f840b | 440 | PERROR("calibrate ioctl"); |
d0254c7c MD |
441 | return -1; |
442 | } | |
443 | ||
444 | return 0; | |
445 | } | |
446 | ||
447 | ||
f3ed775e | 448 | /* |
f3ed775e DG |
449 | * Force flush buffer of metadata. |
450 | */ | |
451 | int kernel_metadata_flush_buffer(int fd) | |
452 | { | |
453 | int ret; | |
454 | ||
455 | ret = kernctl_buffer_flush(fd); | |
456 | if (ret < 0) { | |
00e2e675 | 457 | ERR("Fail to flush metadata buffers %d (ret: %d)", fd, ret); |
f3ed775e DG |
458 | } |
459 | ||
460 | return 0; | |
461 | } | |
462 | ||
463 | /* | |
050349bb | 464 | * Force flush buffer for channel. |
f3ed775e DG |
465 | */ |
466 | int kernel_flush_buffer(struct ltt_kernel_channel *channel) | |
467 | { | |
468 | int ret; | |
469 | struct ltt_kernel_stream *stream; | |
470 | ||
471 | DBG("Flush buffer for channel %s", channel->channel->name); | |
472 | ||
473 | cds_list_for_each_entry(stream, &channel->stream_list.head, list) { | |
474 | DBG("Flushing channel stream %d", stream->fd); | |
475 | ret = kernctl_buffer_flush(stream->fd); | |
476 | if (ret < 0) { | |
df0f840b | 477 | PERROR("ioctl"); |
f3ed775e DG |
478 | ERR("Fail to flush buffer for stream %d (ret: %d)", |
479 | stream->fd, ret); | |
480 | } | |
481 | } | |
482 | ||
483 | return 0; | |
484 | } | |
485 | ||
8c0faa1d | 486 | /* |
050349bb | 487 | * Stop tracing session. |
8c0faa1d DG |
488 | */ |
489 | int kernel_stop_session(struct ltt_kernel_session *session) | |
490 | { | |
491 | int ret; | |
492 | ||
493 | ret = kernctl_stop_session(session->fd); | |
494 | if (ret < 0) { | |
495 | goto error; | |
496 | } | |
497 | ||
498 | DBG("Kernel session stopped"); | |
499 | ||
500 | return 0; | |
501 | ||
502 | error: | |
503 | return ret; | |
504 | } | |
505 | ||
506 | /* | |
050349bb DG |
507 | * Open stream of channel, register it to the kernel tracer and add it |
508 | * to the stream list of the channel. | |
8c0faa1d | 509 | * |
050349bb | 510 | * Return the number of created stream. Else, a negative value. |
8c0faa1d | 511 | */ |
f3ed775e | 512 | int kernel_open_channel_stream(struct ltt_kernel_channel *channel) |
8c0faa1d | 513 | { |
00e2e675 | 514 | int ret, count = 0; |
8c0faa1d DG |
515 | struct ltt_kernel_stream *lks; |
516 | ||
5a47c6a2 | 517 | while ((ret = kernctl_create_stream(channel->fd)) >= 0) { |
00e2e675 | 518 | lks = trace_kernel_create_stream(channel->channel->name, count); |
8c0faa1d | 519 | if (lks == NULL) { |
799e2c4f MD |
520 | ret = close(ret); |
521 | if (ret) { | |
522 | PERROR("close"); | |
523 | } | |
8c0faa1d DG |
524 | goto error; |
525 | } | |
526 | ||
527 | lks->fd = ret; | |
7b395890 DG |
528 | /* Prevent fd duplication after execlp() */ |
529 | ret = fcntl(lks->fd, F_SETFD, FD_CLOEXEC); | |
530 | if (ret < 0) { | |
df0f840b | 531 | PERROR("fcntl session fd"); |
7b395890 DG |
532 | } |
533 | ||
54012638 | 534 | /* Add stream to channe stream list */ |
8c0faa1d DG |
535 | cds_list_add(&lks->list, &channel->stream_list.head); |
536 | channel->stream_count++; | |
8c0faa1d | 537 | |
00e2e675 DG |
538 | /* Increment counter which represent CPU number. */ |
539 | count++; | |
540 | ||
541 | DBG("Kernel stream %s created (fd: %d, state: %d)", lks->name, lks->fd, | |
542 | lks->state); | |
54012638 | 543 | } |
8c0faa1d DG |
544 | |
545 | return channel->stream_count; | |
546 | ||
547 | error: | |
54012638 | 548 | return -1; |
8c0faa1d DG |
549 | } |
550 | ||
551 | /* | |
050349bb | 552 | * Open the metadata stream and set it to the kernel session. |
8c0faa1d | 553 | */ |
f3ed775e | 554 | int kernel_open_metadata_stream(struct ltt_kernel_session *session) |
8c0faa1d DG |
555 | { |
556 | int ret; | |
557 | ||
558 | ret = kernctl_create_stream(session->metadata->fd); | |
559 | if (ret < 0) { | |
df0f840b | 560 | PERROR("kernel create metadata stream"); |
8c0faa1d DG |
561 | goto error; |
562 | } | |
563 | ||
564 | DBG("Kernel metadata stream created (fd: %d)", ret); | |
565 | session->metadata_stream_fd = ret; | |
7b395890 DG |
566 | /* Prevent fd duplication after execlp() */ |
567 | ret = fcntl(session->metadata_stream_fd, F_SETFD, FD_CLOEXEC); | |
568 | if (ret < 0) { | |
df0f840b | 569 | PERROR("fcntl session fd"); |
7b395890 | 570 | } |
aaf26714 DG |
571 | |
572 | return 0; | |
573 | ||
574 | error: | |
54012638 | 575 | return -1; |
aaf26714 | 576 | } |
2ef84c95 DG |
577 | |
578 | /* | |
9f19cc17 | 579 | * Get the event list from the kernel tracer and return the number of elements. |
2ef84c95 | 580 | */ |
9f19cc17 | 581 | ssize_t kernel_list_events(int tracer_fd, struct lttng_event **events) |
2ef84c95 | 582 | { |
799e2c4f | 583 | int fd, pos, ret; |
9f19cc17 DG |
584 | char *event; |
585 | size_t nbmem, count = 0; | |
2ef84c95 DG |
586 | ssize_t size; |
587 | FILE *fp; | |
9f19cc17 | 588 | struct lttng_event *elist; |
2ef84c95 DG |
589 | |
590 | fd = kernctl_tracepoint_list(tracer_fd); | |
591 | if (fd < 0) { | |
df0f840b | 592 | PERROR("kernel tracepoint list"); |
2ef84c95 DG |
593 | goto error; |
594 | } | |
595 | ||
596 | fp = fdopen(fd, "r"); | |
597 | if (fp == NULL) { | |
df0f840b | 598 | PERROR("kernel tracepoint list fdopen"); |
61b73b12 | 599 | goto error_fp; |
2ef84c95 DG |
600 | } |
601 | ||
602 | /* | |
603 | * Init memory size counter | |
604 | * See kernel-ctl.h for explanation of this value | |
605 | */ | |
6725fe19 | 606 | nbmem = KERNEL_EVENT_INIT_LIST_SIZE; |
ba7f0ae5 | 607 | elist = zmalloc(sizeof(struct lttng_event) * nbmem); |
3b870559 MD |
608 | if (elist == NULL) { |
609 | PERROR("alloc list events"); | |
610 | count = -ENOMEM; | |
611 | goto end; | |
612 | } | |
2ef84c95 | 613 | |
9f19cc17 | 614 | while ((size = fscanf(fp, "event { name = %m[^;]; };%n\n", &event, &pos)) == 1) { |
6725fe19 | 615 | if (count >= nbmem) { |
3b870559 MD |
616 | struct lttng_event *new_elist; |
617 | ||
ced2f820 | 618 | DBG("Reallocating event list from %zu to %zu bytes", nbmem, |
6725fe19 DG |
619 | nbmem * 2); |
620 | /* Double the size */ | |
621 | nbmem <<= 1; | |
3b870559 MD |
622 | new_elist = realloc(elist, nbmem * sizeof(struct lttng_event)); |
623 | if (new_elist == NULL) { | |
df0f840b | 624 | PERROR("realloc list events"); |
3b870559 MD |
625 | free(event); |
626 | free(elist); | |
61b73b12 MD |
627 | count = -ENOMEM; |
628 | goto end; | |
2ef84c95 | 629 | } |
3b870559 | 630 | elist = new_elist; |
2ef84c95 | 631 | } |
99497cd0 MD |
632 | strncpy(elist[count].name, event, LTTNG_SYMBOL_NAME_LEN); |
633 | elist[count].name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0'; | |
67b9d018 | 634 | elist[count].enabled = -1; |
9f19cc17 | 635 | count++; |
3b870559 | 636 | free(event); |
2ef84c95 DG |
637 | } |
638 | ||
9f19cc17 | 639 | *events = elist; |
ced2f820 | 640 | DBG("Kernel list events done (%zu events)", count); |
61b73b12 | 641 | end: |
799e2c4f MD |
642 | ret = fclose(fp); /* closes both fp and fd */ |
643 | if (ret) { | |
644 | PERROR("fclose"); | |
645 | } | |
9f19cc17 | 646 | return count; |
2ef84c95 | 647 | |
61b73b12 | 648 | error_fp: |
799e2c4f MD |
649 | ret = close(fd); |
650 | if (ret) { | |
651 | PERROR("close"); | |
652 | } | |
2ef84c95 DG |
653 | error: |
654 | return -1; | |
655 | } | |
096102bd DG |
656 | |
657 | /* | |
658 | * Get kernel version and validate it. | |
659 | */ | |
660 | int kernel_validate_version(int tracer_fd) | |
661 | { | |
662 | int ret; | |
663 | struct lttng_kernel_tracer_version version; | |
664 | ||
665 | ret = kernctl_tracer_version(tracer_fd, &version); | |
666 | if (ret < 0) { | |
667 | ERR("Failed at getting the lttng-modules version"); | |
668 | goto error; | |
669 | } | |
670 | ||
671 | /* Validate version */ | |
a62a6556 MD |
672 | if (version.major != KERN_MODULES_PRE_MAJOR |
673 | && version.major != KERN_MODULES_MAJOR) { | |
096102bd | 674 | goto error_version; |
096102bd DG |
675 | } |
676 | ||
a62a6556 | 677 | DBG2("Kernel tracer version validated (major version %d)", version.major); |
096102bd DG |
678 | return 0; |
679 | ||
680 | error_version: | |
5df0f285 | 681 | ERR("Kernel major version %d is not compatible (supporting <= %d)", |
a62a6556 | 682 | version.major, KERN_MODULES_MAJOR) |
096102bd DG |
683 | ret = -1; |
684 | ||
685 | error: | |
686 | return ret; | |
687 | } | |
335a95b7 MD |
688 | |
689 | /* | |
690 | * Kernel work-arounds called at the start of sessiond main(). | |
691 | */ | |
692 | int init_kernel_workarounds(void) | |
693 | { | |
8936c33a | 694 | int ret; |
335a95b7 MD |
695 | FILE *fp; |
696 | ||
697 | /* | |
698 | * boot_id needs to be read once before being used concurrently | |
699 | * to deal with a Linux kernel race. A fix is proposed for | |
700 | * upstream, but the work-around is needed for older kernels. | |
701 | */ | |
702 | fp = fopen("/proc/sys/kernel/random/boot_id", "r"); | |
703 | if (!fp) { | |
704 | goto end_boot_id; | |
705 | } | |
706 | while (!feof(fp)) { | |
707 | char buf[37] = ""; | |
708 | ||
8936c33a DG |
709 | ret = fread(buf, 1, sizeof(buf), fp); |
710 | if (ret < 0) { | |
711 | /* Ignore error, we don't really care */ | |
712 | } | |
335a95b7 | 713 | } |
799e2c4f MD |
714 | ret = fclose(fp); |
715 | if (ret) { | |
716 | PERROR("fclose"); | |
717 | } | |
335a95b7 | 718 | end_boot_id: |
335a95b7 MD |
719 | return 0; |
720 | } |