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 | |
2f77fc4b | 31 | #include "consumer.h" |
4771f025 | 32 | #include "kernel.h" |
096102bd | 33 | #include "kern-modules.h" |
20fe2104 | 34 | |
d65106b1 | 35 | /* |
050349bb | 36 | * Add context on a kernel channel. |
d65106b1 DG |
37 | */ |
38 | int kernel_add_channel_context(struct ltt_kernel_channel *chan, | |
39 | struct lttng_kernel_context *ctx) | |
40 | { | |
41 | int ret; | |
42 | ||
43 | DBG("Adding context to channel %s", chan->channel->name); | |
44 | ret = kernctl_add_context(chan->fd, ctx); | |
45 | if (ret < 0) { | |
b579acd9 | 46 | if (errno != EEXIST) { |
df0f840b | 47 | PERROR("add context ioctl"); |
b579acd9 DG |
48 | } else { |
49 | /* If EEXIST, we just ignore the error */ | |
50 | ret = 0; | |
51 | } | |
d65106b1 DG |
52 | goto error; |
53 | } | |
54 | ||
ba7f0ae5 | 55 | chan->ctx = zmalloc(sizeof(struct lttng_kernel_context)); |
d65106b1 | 56 | if (chan->ctx == NULL) { |
df0f840b | 57 | PERROR("zmalloc event context"); |
d65106b1 DG |
58 | goto error; |
59 | } | |
60 | ||
61 | memcpy(chan->ctx, ctx, sizeof(struct lttng_kernel_context)); | |
62 | ||
63 | return 0; | |
64 | ||
65 | error: | |
66 | return ret; | |
67 | } | |
68 | ||
69 | /* | |
050349bb | 70 | * Add context on a kernel event. |
d65106b1 DG |
71 | */ |
72 | int kernel_add_event_context(struct ltt_kernel_event *event, | |
73 | struct lttng_kernel_context *ctx) | |
74 | { | |
75 | int ret; | |
76 | ||
77 | DBG("Adding context to event %s", event->event->name); | |
78 | ret = kernctl_add_context(event->fd, ctx); | |
79 | if (ret < 0) { | |
df0f840b | 80 | PERROR("add context ioctl"); |
d65106b1 DG |
81 | goto error; |
82 | } | |
83 | ||
ba7f0ae5 | 84 | event->ctx = zmalloc(sizeof(struct lttng_kernel_context)); |
d65106b1 | 85 | if (event->ctx == NULL) { |
df0f840b | 86 | PERROR("zmalloc event context"); |
d65106b1 DG |
87 | goto error; |
88 | } | |
89 | ||
90 | memcpy(event->ctx, ctx, sizeof(struct lttng_kernel_context)); | |
91 | ||
92 | return 0; | |
93 | ||
94 | error: | |
95 | return ret; | |
96 | } | |
97 | ||
20fe2104 | 98 | /* |
050349bb DG |
99 | * Create a new kernel session, register it to the kernel tracer and add it to |
100 | * the session daemon session. | |
20fe2104 | 101 | */ |
8c0faa1d | 102 | int kernel_create_session(struct ltt_session *session, int tracer_fd) |
20fe2104 DG |
103 | { |
104 | int ret; | |
105 | struct ltt_kernel_session *lks; | |
106 | ||
54012638 | 107 | /* Allocate data structure */ |
f9815039 | 108 | lks = trace_kernel_create_session(session->path); |
20fe2104 | 109 | if (lks == NULL) { |
54012638 | 110 | ret = -1; |
20fe2104 DG |
111 | goto error; |
112 | } | |
113 | ||
54012638 | 114 | /* Kernel tracer session creation */ |
20fe2104 DG |
115 | ret = kernctl_create_session(tracer_fd); |
116 | if (ret < 0) { | |
df0f840b | 117 | PERROR("ioctl kernel create session"); |
20fe2104 DG |
118 | goto error; |
119 | } | |
120 | ||
20fe2104 | 121 | lks->fd = ret; |
7b395890 DG |
122 | /* Prevent fd duplication after execlp() */ |
123 | ret = fcntl(lks->fd, F_SETFD, FD_CLOEXEC); | |
124 | if (ret < 0) { | |
df0f840b | 125 | PERROR("fcntl session fd"); |
7b395890 DG |
126 | } |
127 | ||
53632229 | 128 | lks->id = session->id; |
3bd1e081 | 129 | lks->consumer_fds_sent = 0; |
8c0faa1d | 130 | session->kernel_session = lks; |
8c0faa1d DG |
131 | |
132 | DBG("Kernel session created (fd: %d)", lks->fd); | |
20fe2104 DG |
133 | |
134 | return 0; | |
135 | ||
136 | error: | |
137 | return ret; | |
138 | } | |
139 | ||
140 | /* | |
050349bb DG |
141 | * Create a kernel channel, register it to the kernel tracer and add it to the |
142 | * kernel session. | |
20fe2104 | 143 | */ |
050349bb DG |
144 | int kernel_create_channel(struct ltt_kernel_session *session, |
145 | struct lttng_channel *chan, char *path) | |
20fe2104 DG |
146 | { |
147 | int ret; | |
148 | struct ltt_kernel_channel *lkc; | |
20fe2104 | 149 | |
54012638 | 150 | /* Allocate kernel channel */ |
62499ad6 | 151 | lkc = trace_kernel_create_channel(chan, path); |
54012638 | 152 | if (lkc == NULL) { |
20fe2104 DG |
153 | goto error; |
154 | } | |
155 | ||
77c7c900 | 156 | DBG3("Kernel create channel %s in %s with attr: %d, %" PRIu64 ", %" PRIu64 ", %u, %u, %d", |
173af62f DG |
157 | chan->name, path, lkc->channel->attr.overwrite, |
158 | lkc->channel->attr.subbuf_size, lkc->channel->attr.num_subbuf, | |
159 | lkc->channel->attr.switch_timer_interval, lkc->channel->attr.read_timer_interval, | |
160 | lkc->channel->attr.output); | |
161 | ||
54012638 | 162 | /* Kernel tracer channel creation */ |
f3ed775e | 163 | ret = kernctl_create_channel(session->fd, &lkc->channel->attr); |
20fe2104 | 164 | if (ret < 0) { |
df0f840b | 165 | PERROR("ioctl kernel create channel"); |
20fe2104 DG |
166 | goto error; |
167 | } | |
168 | ||
54012638 | 169 | /* Setup the channel fd */ |
20fe2104 | 170 | lkc->fd = ret; |
7b395890 DG |
171 | /* Prevent fd duplication after execlp() */ |
172 | ret = fcntl(lkc->fd, F_SETFD, FD_CLOEXEC); | |
173 | if (ret < 0) { | |
df0f840b | 174 | PERROR("fcntl session fd"); |
7b395890 DG |
175 | } |
176 | ||
54012638 | 177 | /* Add channel to session */ |
8c0faa1d DG |
178 | cds_list_add(&lkc->list, &session->channel_list.head); |
179 | session->channel_count++; | |
20fe2104 | 180 | |
00e2e675 | 181 | DBG("Kernel channel %s created (fd: %d)", lkc->channel->name, lkc->fd); |
20fe2104 DG |
182 | |
183 | return 0; | |
184 | ||
185 | error: | |
54012638 | 186 | return -1; |
20fe2104 | 187 | } |
f34daff7 DG |
188 | |
189 | /* | |
050349bb DG |
190 | * Create a kernel event, enable it to the kernel tracer and add it to the |
191 | * channel event list of the kernel session. | |
f34daff7 | 192 | */ |
050349bb DG |
193 | int kernel_create_event(struct lttng_event *ev, |
194 | struct ltt_kernel_channel *channel) | |
f34daff7 DG |
195 | { |
196 | int ret; | |
197 | struct ltt_kernel_event *event; | |
f34daff7 | 198 | |
62499ad6 | 199 | event = trace_kernel_create_event(ev); |
54012638 | 200 | if (event == NULL) { |
d87bfb32 | 201 | ret = -1; |
f34daff7 DG |
202 | goto error; |
203 | } | |
204 | ||
f3ed775e DG |
205 | ret = kernctl_create_event(channel->fd, event->event); |
206 | if (ret < 0) { | |
bd29c13d DG |
207 | switch (errno) { |
208 | case EEXIST: | |
209 | break; | |
210 | case ENOSYS: | |
211 | WARN("Event type not implemented"); | |
212 | break; | |
213 | default: | |
d87bfb32 DG |
214 | PERROR("create event ioctl"); |
215 | } | |
216 | ret = -errno; | |
e953ef25 | 217 | goto free_event; |
8c0faa1d | 218 | } |
f34daff7 | 219 | |
5f822d0a | 220 | /* |
2c425ff7 | 221 | * LTTNG_KERNEL_SYSCALL event creation will return 0 on success. |
5f822d0a DG |
222 | */ |
223 | if (ret == 0 && event->event->instrumentation == LTTNG_KERNEL_SYSCALL) { | |
224 | DBG2("Kernel event syscall creation success"); | |
87eb4ab8 MD |
225 | /* |
226 | * We use fd == -1 to ensure that we never trigger a close of fd | |
227 | * 0. | |
228 | */ | |
229 | event->fd = -1; | |
2c425ff7 | 230 | goto add_list; |
5f822d0a DG |
231 | } |
232 | ||
f3ed775e | 233 | event->fd = ret; |
7b395890 DG |
234 | /* Prevent fd duplication after execlp() */ |
235 | ret = fcntl(event->fd, F_SETFD, FD_CLOEXEC); | |
236 | if (ret < 0) { | |
df0f840b | 237 | PERROR("fcntl session fd"); |
7b395890 DG |
238 | } |
239 | ||
2c425ff7 | 240 | add_list: |
f3ed775e DG |
241 | /* Add event to event list */ |
242 | cds_list_add(&event->list, &channel->events_list.head); | |
cbbbb275 DG |
243 | channel->event_count++; |
244 | ||
e953ef25 DG |
245 | DBG("Event %s created (fd: %d)", ev->name, event->fd); |
246 | ||
247 | return 0; | |
248 | ||
249 | free_event: | |
250 | free(event); | |
251 | error: | |
d87bfb32 | 252 | return ret; |
e953ef25 DG |
253 | } |
254 | ||
26cc6b4e | 255 | /* |
050349bb | 256 | * Disable a kernel channel. |
26cc6b4e DG |
257 | */ |
258 | int kernel_disable_channel(struct ltt_kernel_channel *chan) | |
259 | { | |
260 | int ret; | |
261 | ||
262 | ret = kernctl_disable(chan->fd); | |
263 | if (ret < 0) { | |
df0f840b | 264 | PERROR("disable chan ioctl"); |
26cc6b4e DG |
265 | ret = errno; |
266 | goto error; | |
267 | } | |
268 | ||
269 | chan->enabled = 0; | |
270 | DBG("Kernel channel %s disabled (fd: %d)", chan->channel->name, chan->fd); | |
271 | ||
272 | return 0; | |
273 | ||
274 | error: | |
275 | return ret; | |
276 | } | |
277 | ||
d36b8583 | 278 | /* |
050349bb | 279 | * Enable a kernel channel. |
d36b8583 DG |
280 | */ |
281 | int kernel_enable_channel(struct ltt_kernel_channel *chan) | |
282 | { | |
283 | int ret; | |
284 | ||
285 | ret = kernctl_enable(chan->fd); | |
54d01ffb | 286 | if (ret < 0 && errno != EEXIST) { |
df0f840b | 287 | PERROR("Enable kernel chan"); |
d36b8583 DG |
288 | goto error; |
289 | } | |
290 | ||
291 | chan->enabled = 1; | |
292 | DBG("Kernel channel %s enabled (fd: %d)", chan->channel->name, chan->fd); | |
293 | ||
294 | return 0; | |
295 | ||
296 | error: | |
297 | return ret; | |
298 | } | |
299 | ||
19e70852 | 300 | /* |
050349bb | 301 | * Enable a kernel event. |
19e70852 DG |
302 | */ |
303 | int kernel_enable_event(struct ltt_kernel_event *event) | |
304 | { | |
305 | int ret; | |
306 | ||
307 | ret = kernctl_enable(event->fd); | |
42224349 DG |
308 | if (ret < 0) { |
309 | switch (errno) { | |
310 | case EEXIST: | |
f73fabfd | 311 | ret = LTTNG_ERR_KERN_EVENT_EXIST; |
42224349 DG |
312 | break; |
313 | default: | |
314 | PERROR("enable kernel event"); | |
315 | break; | |
316 | } | |
19e70852 DG |
317 | goto error; |
318 | } | |
319 | ||
320 | event->enabled = 1; | |
321 | DBG("Kernel event %s enabled (fd: %d)", event->event->name, event->fd); | |
322 | ||
323 | return 0; | |
324 | ||
325 | error: | |
d36b8583 | 326 | return ret; |
19e70852 DG |
327 | } |
328 | ||
e953ef25 | 329 | /* |
050349bb | 330 | * Disable a kernel event. |
e953ef25 | 331 | */ |
19e70852 | 332 | int kernel_disable_event(struct ltt_kernel_event *event) |
e953ef25 DG |
333 | { |
334 | int ret; | |
19e70852 DG |
335 | |
336 | ret = kernctl_disable(event->fd); | |
42224349 DG |
337 | if (ret < 0) { |
338 | switch (errno) { | |
339 | case EEXIST: | |
f73fabfd | 340 | ret = LTTNG_ERR_KERN_EVENT_EXIST; |
42224349 DG |
341 | break; |
342 | default: | |
343 | PERROR("disable kernel event"); | |
344 | break; | |
345 | } | |
19e70852 | 346 | goto error; |
e953ef25 | 347 | } |
f3ed775e | 348 | |
19e70852 DG |
349 | event->enabled = 0; |
350 | DBG("Kernel event %s disabled (fd: %d)", event->event->name, event->fd); | |
351 | ||
f34daff7 DG |
352 | return 0; |
353 | ||
354 | error: | |
d36b8583 | 355 | return ret; |
f34daff7 | 356 | } |
aaf26714 DG |
357 | |
358 | /* | |
050349bb DG |
359 | * Create kernel metadata, open from the kernel tracer and add it to the |
360 | * kernel session. | |
aaf26714 | 361 | */ |
a4b92340 | 362 | int kernel_open_metadata(struct ltt_kernel_session *session) |
aaf26714 DG |
363 | { |
364 | int ret; | |
365 | struct ltt_kernel_metadata *lkm; | |
aaf26714 | 366 | |
54012638 | 367 | /* Allocate kernel metadata */ |
a4b92340 | 368 | lkm = trace_kernel_create_metadata(); |
54012638 | 369 | if (lkm == NULL) { |
aaf26714 DG |
370 | goto error; |
371 | } | |
372 | ||
54012638 | 373 | /* Kernel tracer metadata creation */ |
f3ed775e | 374 | ret = kernctl_open_metadata(session->fd, &lkm->conf->attr); |
aaf26714 DG |
375 | if (ret < 0) { |
376 | goto error; | |
377 | } | |
378 | ||
8c0faa1d | 379 | lkm->fd = ret; |
7b395890 DG |
380 | /* Prevent fd duplication after execlp() */ |
381 | ret = fcntl(lkm->fd, F_SETFD, FD_CLOEXEC); | |
382 | if (ret < 0) { | |
df0f840b | 383 | PERROR("fcntl session fd"); |
7b395890 DG |
384 | } |
385 | ||
aaf26714 | 386 | session->metadata = lkm; |
8c0faa1d | 387 | |
00e2e675 | 388 | DBG("Kernel metadata opened (fd: %d)", lkm->fd); |
8c0faa1d DG |
389 | |
390 | return 0; | |
391 | ||
392 | error: | |
54012638 | 393 | return -1; |
8c0faa1d DG |
394 | } |
395 | ||
396 | /* | |
050349bb | 397 | * Start tracing session. |
8c0faa1d DG |
398 | */ |
399 | int kernel_start_session(struct ltt_kernel_session *session) | |
400 | { | |
401 | int ret; | |
402 | ||
403 | ret = kernctl_start_session(session->fd); | |
404 | if (ret < 0) { | |
df0f840b | 405 | PERROR("ioctl start session"); |
8c0faa1d DG |
406 | goto error; |
407 | } | |
408 | ||
409 | DBG("Kernel session started"); | |
410 | ||
411 | return 0; | |
412 | ||
413 | error: | |
414 | return ret; | |
415 | } | |
416 | ||
f3ed775e | 417 | /* |
050349bb | 418 | * Make a kernel wait to make sure in-flight probe have completed. |
f3ed775e DG |
419 | */ |
420 | void kernel_wait_quiescent(int fd) | |
421 | { | |
422 | int ret; | |
423 | ||
424 | DBG("Kernel quiescent wait on %d", fd); | |
425 | ||
426 | ret = kernctl_wait_quiescent(fd); | |
427 | if (ret < 0) { | |
df0f840b | 428 | PERROR("wait quiescent ioctl"); |
f3ed775e DG |
429 | ERR("Kernel quiescent wait failed"); |
430 | } | |
431 | } | |
432 | ||
d0254c7c | 433 | /* |
050349bb | 434 | * Kernel calibrate |
d0254c7c MD |
435 | */ |
436 | int kernel_calibrate(int fd, struct lttng_kernel_calibrate *calibrate) | |
437 | { | |
438 | int ret; | |
439 | ||
440 | ret = kernctl_calibrate(fd, calibrate); | |
441 | if (ret < 0) { | |
df0f840b | 442 | PERROR("calibrate ioctl"); |
d0254c7c MD |
443 | return -1; |
444 | } | |
445 | ||
446 | return 0; | |
447 | } | |
448 | ||
449 | ||
f3ed775e | 450 | /* |
f3ed775e DG |
451 | * Force flush buffer of metadata. |
452 | */ | |
453 | int kernel_metadata_flush_buffer(int fd) | |
454 | { | |
455 | int ret; | |
456 | ||
457 | ret = kernctl_buffer_flush(fd); | |
458 | if (ret < 0) { | |
00e2e675 | 459 | ERR("Fail to flush metadata buffers %d (ret: %d)", fd, ret); |
f3ed775e DG |
460 | } |
461 | ||
462 | return 0; | |
463 | } | |
464 | ||
465 | /* | |
050349bb | 466 | * Force flush buffer for channel. |
f3ed775e DG |
467 | */ |
468 | int kernel_flush_buffer(struct ltt_kernel_channel *channel) | |
469 | { | |
470 | int ret; | |
471 | struct ltt_kernel_stream *stream; | |
472 | ||
473 | DBG("Flush buffer for channel %s", channel->channel->name); | |
474 | ||
475 | cds_list_for_each_entry(stream, &channel->stream_list.head, list) { | |
476 | DBG("Flushing channel stream %d", stream->fd); | |
477 | ret = kernctl_buffer_flush(stream->fd); | |
478 | if (ret < 0) { | |
df0f840b | 479 | PERROR("ioctl"); |
f3ed775e DG |
480 | ERR("Fail to flush buffer for stream %d (ret: %d)", |
481 | stream->fd, ret); | |
482 | } | |
483 | } | |
484 | ||
485 | return 0; | |
486 | } | |
487 | ||
8c0faa1d | 488 | /* |
050349bb | 489 | * Stop tracing session. |
8c0faa1d DG |
490 | */ |
491 | int kernel_stop_session(struct ltt_kernel_session *session) | |
492 | { | |
493 | int ret; | |
494 | ||
495 | ret = kernctl_stop_session(session->fd); | |
496 | if (ret < 0) { | |
497 | goto error; | |
498 | } | |
499 | ||
500 | DBG("Kernel session stopped"); | |
501 | ||
502 | return 0; | |
503 | ||
504 | error: | |
505 | return ret; | |
506 | } | |
507 | ||
508 | /* | |
050349bb DG |
509 | * Open stream of channel, register it to the kernel tracer and add it |
510 | * to the stream list of the channel. | |
8c0faa1d | 511 | * |
050349bb | 512 | * Return the number of created stream. Else, a negative value. |
8c0faa1d | 513 | */ |
f3ed775e | 514 | int kernel_open_channel_stream(struct ltt_kernel_channel *channel) |
8c0faa1d | 515 | { |
00e2e675 | 516 | int ret, count = 0; |
8c0faa1d DG |
517 | struct ltt_kernel_stream *lks; |
518 | ||
5a47c6a2 | 519 | while ((ret = kernctl_create_stream(channel->fd)) >= 0) { |
00e2e675 | 520 | lks = trace_kernel_create_stream(channel->channel->name, count); |
8c0faa1d | 521 | if (lks == NULL) { |
799e2c4f MD |
522 | ret = close(ret); |
523 | if (ret) { | |
524 | PERROR("close"); | |
525 | } | |
8c0faa1d DG |
526 | goto error; |
527 | } | |
528 | ||
529 | lks->fd = ret; | |
7b395890 DG |
530 | /* Prevent fd duplication after execlp() */ |
531 | ret = fcntl(lks->fd, F_SETFD, FD_CLOEXEC); | |
532 | if (ret < 0) { | |
df0f840b | 533 | PERROR("fcntl session fd"); |
7b395890 DG |
534 | } |
535 | ||
54012638 | 536 | /* Add stream to channe stream list */ |
8c0faa1d DG |
537 | cds_list_add(&lks->list, &channel->stream_list.head); |
538 | channel->stream_count++; | |
8c0faa1d | 539 | |
00e2e675 DG |
540 | /* Increment counter which represent CPU number. */ |
541 | count++; | |
542 | ||
543 | DBG("Kernel stream %s created (fd: %d, state: %d)", lks->name, lks->fd, | |
544 | lks->state); | |
54012638 | 545 | } |
8c0faa1d DG |
546 | |
547 | return channel->stream_count; | |
548 | ||
549 | error: | |
54012638 | 550 | return -1; |
8c0faa1d DG |
551 | } |
552 | ||
553 | /* | |
050349bb | 554 | * Open the metadata stream and set it to the kernel session. |
8c0faa1d | 555 | */ |
f3ed775e | 556 | int kernel_open_metadata_stream(struct ltt_kernel_session *session) |
8c0faa1d DG |
557 | { |
558 | int ret; | |
559 | ||
560 | ret = kernctl_create_stream(session->metadata->fd); | |
561 | if (ret < 0) { | |
df0f840b | 562 | PERROR("kernel create metadata stream"); |
8c0faa1d DG |
563 | goto error; |
564 | } | |
565 | ||
566 | DBG("Kernel metadata stream created (fd: %d)", ret); | |
567 | session->metadata_stream_fd = ret; | |
7b395890 DG |
568 | /* Prevent fd duplication after execlp() */ |
569 | ret = fcntl(session->metadata_stream_fd, F_SETFD, FD_CLOEXEC); | |
570 | if (ret < 0) { | |
df0f840b | 571 | PERROR("fcntl session fd"); |
7b395890 | 572 | } |
aaf26714 DG |
573 | |
574 | return 0; | |
575 | ||
576 | error: | |
54012638 | 577 | return -1; |
aaf26714 | 578 | } |
2ef84c95 DG |
579 | |
580 | /* | |
9f19cc17 | 581 | * Get the event list from the kernel tracer and return the number of elements. |
2ef84c95 | 582 | */ |
9f19cc17 | 583 | ssize_t kernel_list_events(int tracer_fd, struct lttng_event **events) |
2ef84c95 | 584 | { |
799e2c4f | 585 | int fd, pos, ret; |
9f19cc17 DG |
586 | char *event; |
587 | size_t nbmem, count = 0; | |
2ef84c95 DG |
588 | ssize_t size; |
589 | FILE *fp; | |
9f19cc17 | 590 | struct lttng_event *elist; |
2ef84c95 DG |
591 | |
592 | fd = kernctl_tracepoint_list(tracer_fd); | |
593 | if (fd < 0) { | |
df0f840b | 594 | PERROR("kernel tracepoint list"); |
2ef84c95 DG |
595 | goto error; |
596 | } | |
597 | ||
598 | fp = fdopen(fd, "r"); | |
599 | if (fp == NULL) { | |
df0f840b | 600 | PERROR("kernel tracepoint list fdopen"); |
61b73b12 | 601 | goto error_fp; |
2ef84c95 DG |
602 | } |
603 | ||
604 | /* | |
605 | * Init memory size counter | |
606 | * See kernel-ctl.h for explanation of this value | |
607 | */ | |
6725fe19 | 608 | nbmem = KERNEL_EVENT_INIT_LIST_SIZE; |
ba7f0ae5 | 609 | elist = zmalloc(sizeof(struct lttng_event) * nbmem); |
3b870559 MD |
610 | if (elist == NULL) { |
611 | PERROR("alloc list events"); | |
612 | count = -ENOMEM; | |
613 | goto end; | |
614 | } | |
2ef84c95 | 615 | |
9f19cc17 | 616 | while ((size = fscanf(fp, "event { name = %m[^;]; };%n\n", &event, &pos)) == 1) { |
6725fe19 | 617 | if (count >= nbmem) { |
3b870559 MD |
618 | struct lttng_event *new_elist; |
619 | ||
ced2f820 | 620 | DBG("Reallocating event list from %zu to %zu bytes", nbmem, |
6725fe19 DG |
621 | nbmem * 2); |
622 | /* Double the size */ | |
623 | nbmem <<= 1; | |
3b870559 MD |
624 | new_elist = realloc(elist, nbmem * sizeof(struct lttng_event)); |
625 | if (new_elist == NULL) { | |
df0f840b | 626 | PERROR("realloc list events"); |
3b870559 MD |
627 | free(event); |
628 | free(elist); | |
61b73b12 MD |
629 | count = -ENOMEM; |
630 | goto end; | |
2ef84c95 | 631 | } |
3b870559 | 632 | elist = new_elist; |
2ef84c95 | 633 | } |
99497cd0 MD |
634 | strncpy(elist[count].name, event, LTTNG_SYMBOL_NAME_LEN); |
635 | elist[count].name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0'; | |
67b9d018 | 636 | elist[count].enabled = -1; |
9f19cc17 | 637 | count++; |
3b870559 | 638 | free(event); |
2ef84c95 DG |
639 | } |
640 | ||
9f19cc17 | 641 | *events = elist; |
ced2f820 | 642 | DBG("Kernel list events done (%zu events)", count); |
61b73b12 | 643 | end: |
799e2c4f MD |
644 | ret = fclose(fp); /* closes both fp and fd */ |
645 | if (ret) { | |
646 | PERROR("fclose"); | |
647 | } | |
9f19cc17 | 648 | return count; |
2ef84c95 | 649 | |
61b73b12 | 650 | error_fp: |
799e2c4f MD |
651 | ret = close(fd); |
652 | if (ret) { | |
653 | PERROR("close"); | |
654 | } | |
2ef84c95 DG |
655 | error: |
656 | return -1; | |
657 | } | |
096102bd DG |
658 | |
659 | /* | |
660 | * Get kernel version and validate it. | |
661 | */ | |
662 | int kernel_validate_version(int tracer_fd) | |
663 | { | |
664 | int ret; | |
665 | struct lttng_kernel_tracer_version version; | |
666 | ||
667 | ret = kernctl_tracer_version(tracer_fd, &version); | |
668 | if (ret < 0) { | |
669 | ERR("Failed at getting the lttng-modules version"); | |
670 | goto error; | |
671 | } | |
672 | ||
673 | /* Validate version */ | |
a62a6556 MD |
674 | if (version.major != KERN_MODULES_PRE_MAJOR |
675 | && version.major != KERN_MODULES_MAJOR) { | |
096102bd | 676 | goto error_version; |
096102bd DG |
677 | } |
678 | ||
a62a6556 | 679 | DBG2("Kernel tracer version validated (major version %d)", version.major); |
096102bd DG |
680 | return 0; |
681 | ||
682 | error_version: | |
5df0f285 | 683 | ERR("Kernel major version %d is not compatible (supporting <= %d)", |
a62a6556 | 684 | version.major, KERN_MODULES_MAJOR) |
096102bd DG |
685 | ret = -1; |
686 | ||
687 | error: | |
688 | return ret; | |
689 | } | |
335a95b7 MD |
690 | |
691 | /* | |
692 | * Kernel work-arounds called at the start of sessiond main(). | |
693 | */ | |
694 | int init_kernel_workarounds(void) | |
695 | { | |
8936c33a | 696 | int ret; |
335a95b7 MD |
697 | FILE *fp; |
698 | ||
699 | /* | |
700 | * boot_id needs to be read once before being used concurrently | |
701 | * to deal with a Linux kernel race. A fix is proposed for | |
702 | * upstream, but the work-around is needed for older kernels. | |
703 | */ | |
704 | fp = fopen("/proc/sys/kernel/random/boot_id", "r"); | |
705 | if (!fp) { | |
706 | goto end_boot_id; | |
707 | } | |
708 | while (!feof(fp)) { | |
709 | char buf[37] = ""; | |
710 | ||
8936c33a DG |
711 | ret = fread(buf, 1, sizeof(buf), fp); |
712 | if (ret < 0) { | |
713 | /* Ignore error, we don't really care */ | |
714 | } | |
335a95b7 | 715 | } |
799e2c4f MD |
716 | ret = fclose(fp); |
717 | if (ret) { | |
718 | PERROR("fclose"); | |
719 | } | |
335a95b7 | 720 | end_boot_id: |
335a95b7 MD |
721 | return 0; |
722 | } | |
2f77fc4b DG |
723 | |
724 | /* | |
725 | * Complete teardown of a kernel session. | |
726 | */ | |
727 | void kernel_destroy_session(struct ltt_kernel_session *ksess) | |
728 | { | |
729 | if (ksess == NULL) { | |
730 | DBG3("No kernel session when tearing down session"); | |
731 | return; | |
732 | } | |
733 | ||
734 | DBG("Tearing down kernel session"); | |
735 | ||
736 | /* Close any relayd session */ | |
737 | consumer_output_send_destroy_relayd(ksess->consumer); | |
738 | ||
739 | trace_kernel_destroy_session(ksess); | |
740 | } |