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> |
084cb5fe | 29 | #include <common/kernel-ctl/kernel-ioctl.h> |
42224349 | 30 | #include <common/sessiond-comm/sessiond-comm.h> |
1e307fab | 31 | |
2f77fc4b | 32 | #include "consumer.h" |
4771f025 | 33 | #include "kernel.h" |
6dc3064a | 34 | #include "kernel-consumer.h" |
096102bd | 35 | #include "kern-modules.h" |
834978fd | 36 | #include "utils.h" |
20fe2104 | 37 | |
d65106b1 | 38 | /* |
050349bb | 39 | * Add context on a kernel channel. |
d65106b1 DG |
40 | */ |
41 | int kernel_add_channel_context(struct ltt_kernel_channel *chan, | |
645328ae | 42 | struct ltt_kernel_context *ctx) |
d65106b1 DG |
43 | { |
44 | int ret; | |
45 | ||
0525e9ae DG |
46 | assert(chan); |
47 | assert(ctx); | |
48 | ||
d65106b1 | 49 | DBG("Adding context to channel %s", chan->channel->name); |
645328ae | 50 | ret = kernctl_add_context(chan->fd, &ctx->ctx); |
d65106b1 | 51 | if (ret < 0) { |
b579acd9 | 52 | if (errno != EEXIST) { |
df0f840b | 53 | PERROR("add context ioctl"); |
b579acd9 DG |
54 | } else { |
55 | /* If EEXIST, we just ignore the error */ | |
56 | ret = 0; | |
57 | } | |
d65106b1 DG |
58 | goto error; |
59 | } | |
60 | ||
645328ae | 61 | cds_list_add_tail(&ctx->list, &chan->ctx_list); |
d65106b1 DG |
62 | |
63 | return 0; | |
64 | ||
65 | error: | |
66 | return ret; | |
67 | } | |
68 | ||
20fe2104 | 69 | /* |
050349bb DG |
70 | * Create a new kernel session, register it to the kernel tracer and add it to |
71 | * the session daemon session. | |
20fe2104 | 72 | */ |
8c0faa1d | 73 | int kernel_create_session(struct ltt_session *session, int tracer_fd) |
20fe2104 DG |
74 | { |
75 | int ret; | |
76 | struct ltt_kernel_session *lks; | |
77 | ||
0525e9ae DG |
78 | assert(session); |
79 | ||
54012638 | 80 | /* Allocate data structure */ |
dec56f6c | 81 | lks = trace_kernel_create_session(); |
20fe2104 | 82 | if (lks == NULL) { |
54012638 | 83 | ret = -1; |
20fe2104 DG |
84 | goto error; |
85 | } | |
86 | ||
54012638 | 87 | /* Kernel tracer session creation */ |
20fe2104 DG |
88 | ret = kernctl_create_session(tracer_fd); |
89 | if (ret < 0) { | |
df0f840b | 90 | PERROR("ioctl kernel create session"); |
20fe2104 DG |
91 | goto error; |
92 | } | |
93 | ||
20fe2104 | 94 | lks->fd = ret; |
7b395890 DG |
95 | /* Prevent fd duplication after execlp() */ |
96 | ret = fcntl(lks->fd, F_SETFD, FD_CLOEXEC); | |
97 | if (ret < 0) { | |
df0f840b | 98 | PERROR("fcntl session fd"); |
7b395890 DG |
99 | } |
100 | ||
53632229 | 101 | lks->id = session->id; |
3bd1e081 | 102 | lks->consumer_fds_sent = 0; |
8c0faa1d | 103 | session->kernel_session = lks; |
8c0faa1d DG |
104 | |
105 | DBG("Kernel session created (fd: %d)", lks->fd); | |
20fe2104 DG |
106 | |
107 | return 0; | |
108 | ||
109 | error: | |
5f62c685 DG |
110 | if (lks) { |
111 | trace_kernel_destroy_session(lks); | |
112 | } | |
20fe2104 DG |
113 | return ret; |
114 | } | |
115 | ||
116 | /* | |
050349bb DG |
117 | * Create a kernel channel, register it to the kernel tracer and add it to the |
118 | * kernel session. | |
20fe2104 | 119 | */ |
050349bb | 120 | int kernel_create_channel(struct ltt_kernel_session *session, |
fdd9eb17 | 121 | struct lttng_channel *chan) |
20fe2104 DG |
122 | { |
123 | int ret; | |
124 | struct ltt_kernel_channel *lkc; | |
20fe2104 | 125 | |
0525e9ae DG |
126 | assert(session); |
127 | assert(chan); | |
0525e9ae | 128 | |
54012638 | 129 | /* Allocate kernel channel */ |
fdd9eb17 | 130 | lkc = trace_kernel_create_channel(chan); |
54012638 | 131 | if (lkc == NULL) { |
20fe2104 DG |
132 | goto error; |
133 | } | |
134 | ||
ecc48a90 | 135 | DBG3("Kernel create channel %s with attr: %d, %" PRIu64 ", %" PRIu64 ", %u, %u, %d, %d", |
fdd9eb17 | 136 | chan->name, lkc->channel->attr.overwrite, |
173af62f DG |
137 | lkc->channel->attr.subbuf_size, lkc->channel->attr.num_subbuf, |
138 | lkc->channel->attr.switch_timer_interval, lkc->channel->attr.read_timer_interval, | |
ecc48a90 | 139 | lkc->channel->attr.live_timer_interval, lkc->channel->attr.output); |
173af62f | 140 | |
54012638 | 141 | /* Kernel tracer channel creation */ |
f3ed775e | 142 | ret = kernctl_create_channel(session->fd, &lkc->channel->attr); |
20fe2104 | 143 | if (ret < 0) { |
df0f840b | 144 | PERROR("ioctl kernel create channel"); |
20fe2104 DG |
145 | goto error; |
146 | } | |
147 | ||
54012638 | 148 | /* Setup the channel fd */ |
20fe2104 | 149 | lkc->fd = ret; |
7b395890 DG |
150 | /* Prevent fd duplication after execlp() */ |
151 | ret = fcntl(lkc->fd, F_SETFD, FD_CLOEXEC); | |
152 | if (ret < 0) { | |
df0f840b | 153 | PERROR("fcntl session fd"); |
7b395890 DG |
154 | } |
155 | ||
54012638 | 156 | /* Add channel to session */ |
8c0faa1d DG |
157 | cds_list_add(&lkc->list, &session->channel_list.head); |
158 | session->channel_count++; | |
fb5f35b6 | 159 | lkc->session = session; |
20fe2104 | 160 | |
00e2e675 | 161 | DBG("Kernel channel %s created (fd: %d)", lkc->channel->name, lkc->fd); |
20fe2104 DG |
162 | |
163 | return 0; | |
164 | ||
165 | error: | |
5f62c685 DG |
166 | if (lkc) { |
167 | free(lkc->channel); | |
168 | free(lkc); | |
169 | } | |
54012638 | 170 | return -1; |
20fe2104 | 171 | } |
f34daff7 DG |
172 | |
173 | /* | |
050349bb DG |
174 | * Create a kernel event, enable it to the kernel tracer and add it to the |
175 | * channel event list of the kernel session. | |
faa9eb17 | 176 | * We own filter_expression and filter. |
f34daff7 | 177 | */ |
050349bb DG |
178 | int kernel_create_event(struct lttng_event *ev, |
179 | struct ltt_kernel_channel *channel) | |
f34daff7 DG |
180 | { |
181 | int ret; | |
182 | struct ltt_kernel_event *event; | |
f34daff7 | 183 | |
0525e9ae DG |
184 | assert(ev); |
185 | assert(channel); | |
186 | ||
62499ad6 | 187 | event = trace_kernel_create_event(ev); |
54012638 | 188 | if (event == NULL) { |
d87bfb32 | 189 | ret = -1; |
f34daff7 DG |
190 | goto error; |
191 | } | |
192 | ||
f3ed775e DG |
193 | ret = kernctl_create_event(channel->fd, event->event); |
194 | if (ret < 0) { | |
bd29c13d DG |
195 | switch (errno) { |
196 | case EEXIST: | |
197 | break; | |
198 | case ENOSYS: | |
199 | WARN("Event type not implemented"); | |
200 | break; | |
8197a339 DG |
201 | case ENOENT: |
202 | WARN("Event %s not found!", ev->name); | |
203 | break; | |
bd29c13d | 204 | default: |
d87bfb32 DG |
205 | PERROR("create event ioctl"); |
206 | } | |
207 | ret = -errno; | |
e953ef25 | 208 | goto free_event; |
8c0faa1d | 209 | } |
f34daff7 | 210 | |
5f822d0a | 211 | /* |
2c425ff7 | 212 | * LTTNG_KERNEL_SYSCALL event creation will return 0 on success. |
5f822d0a DG |
213 | */ |
214 | if (ret == 0 && event->event->instrumentation == LTTNG_KERNEL_SYSCALL) { | |
215 | DBG2("Kernel event syscall creation success"); | |
87eb4ab8 MD |
216 | /* |
217 | * We use fd == -1 to ensure that we never trigger a close of fd | |
218 | * 0. | |
219 | */ | |
220 | event->fd = -1; | |
2c425ff7 | 221 | goto add_list; |
5f822d0a DG |
222 | } |
223 | ||
f3ed775e | 224 | event->fd = ret; |
7b395890 DG |
225 | /* Prevent fd duplication after execlp() */ |
226 | ret = fcntl(event->fd, F_SETFD, FD_CLOEXEC); | |
227 | if (ret < 0) { | |
df0f840b | 228 | PERROR("fcntl session fd"); |
7b395890 DG |
229 | } |
230 | ||
2c425ff7 | 231 | add_list: |
f3ed775e DG |
232 | /* Add event to event list */ |
233 | cds_list_add(&event->list, &channel->events_list.head); | |
cbbbb275 DG |
234 | channel->event_count++; |
235 | ||
e953ef25 DG |
236 | DBG("Event %s created (fd: %d)", ev->name, event->fd); |
237 | ||
238 | return 0; | |
239 | ||
240 | free_event: | |
241 | free(event); | |
242 | error: | |
d87bfb32 | 243 | return ret; |
e953ef25 DG |
244 | } |
245 | ||
26cc6b4e | 246 | /* |
050349bb | 247 | * Disable a kernel channel. |
26cc6b4e DG |
248 | */ |
249 | int kernel_disable_channel(struct ltt_kernel_channel *chan) | |
250 | { | |
251 | int ret; | |
252 | ||
0525e9ae DG |
253 | assert(chan); |
254 | ||
26cc6b4e DG |
255 | ret = kernctl_disable(chan->fd); |
256 | if (ret < 0) { | |
df0f840b | 257 | PERROR("disable chan ioctl"); |
26cc6b4e DG |
258 | ret = errno; |
259 | goto error; | |
260 | } | |
261 | ||
262 | chan->enabled = 0; | |
263 | DBG("Kernel channel %s disabled (fd: %d)", chan->channel->name, chan->fd); | |
264 | ||
265 | return 0; | |
266 | ||
267 | error: | |
268 | return ret; | |
269 | } | |
270 | ||
d36b8583 | 271 | /* |
050349bb | 272 | * Enable a kernel channel. |
d36b8583 DG |
273 | */ |
274 | int kernel_enable_channel(struct ltt_kernel_channel *chan) | |
275 | { | |
276 | int ret; | |
277 | ||
0525e9ae DG |
278 | assert(chan); |
279 | ||
d36b8583 | 280 | ret = kernctl_enable(chan->fd); |
54d01ffb | 281 | if (ret < 0 && errno != EEXIST) { |
df0f840b | 282 | PERROR("Enable kernel chan"); |
d36b8583 DG |
283 | goto error; |
284 | } | |
285 | ||
286 | chan->enabled = 1; | |
287 | DBG("Kernel channel %s enabled (fd: %d)", chan->channel->name, chan->fd); | |
288 | ||
289 | return 0; | |
290 | ||
291 | error: | |
292 | return ret; | |
293 | } | |
294 | ||
19e70852 | 295 | /* |
050349bb | 296 | * Enable a kernel event. |
19e70852 DG |
297 | */ |
298 | int kernel_enable_event(struct ltt_kernel_event *event) | |
299 | { | |
300 | int ret; | |
301 | ||
0525e9ae DG |
302 | assert(event); |
303 | ||
19e70852 | 304 | ret = kernctl_enable(event->fd); |
42224349 DG |
305 | if (ret < 0) { |
306 | switch (errno) { | |
307 | case EEXIST: | |
f73fabfd | 308 | ret = LTTNG_ERR_KERN_EVENT_EXIST; |
42224349 DG |
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 | 332 | |
0525e9ae DG |
333 | assert(event); |
334 | ||
19e70852 | 335 | ret = kernctl_disable(event->fd); |
42224349 DG |
336 | if (ret < 0) { |
337 | switch (errno) { | |
338 | case EEXIST: | |
f73fabfd | 339 | ret = LTTNG_ERR_KERN_EVENT_EXIST; |
42224349 DG |
340 | break; |
341 | default: | |
342 | PERROR("disable kernel event"); | |
343 | break; | |
344 | } | |
19e70852 | 345 | goto error; |
e953ef25 | 346 | } |
f3ed775e | 347 | |
19e70852 DG |
348 | event->enabled = 0; |
349 | DBG("Kernel event %s disabled (fd: %d)", event->event->name, event->fd); | |
350 | ||
f34daff7 DG |
351 | return 0; |
352 | ||
353 | error: | |
d36b8583 | 354 | return ret; |
f34daff7 | 355 | } |
aaf26714 | 356 | |
6e911cad MD |
357 | int kernel_enable_syscall(const char *syscall_name, |
358 | struct ltt_kernel_channel *channel) | |
359 | { | |
360 | return kernctl_enable_syscall(channel->fd, syscall_name); | |
361 | } | |
362 | ||
363 | int kernel_disable_syscall(const char *syscall_name, | |
364 | struct ltt_kernel_channel *channel) | |
365 | { | |
366 | return kernctl_disable_syscall(channel->fd, syscall_name); | |
367 | } | |
368 | ||
aaf26714 | 369 | /* |
050349bb DG |
370 | * Create kernel metadata, open from the kernel tracer and add it to the |
371 | * kernel session. | |
aaf26714 | 372 | */ |
a4b92340 | 373 | int kernel_open_metadata(struct ltt_kernel_session *session) |
aaf26714 DG |
374 | { |
375 | int ret; | |
74024a21 | 376 | struct ltt_kernel_metadata *lkm = NULL; |
aaf26714 | 377 | |
0525e9ae DG |
378 | assert(session); |
379 | ||
54012638 | 380 | /* Allocate kernel metadata */ |
a4b92340 | 381 | lkm = trace_kernel_create_metadata(); |
54012638 | 382 | if (lkm == NULL) { |
aaf26714 DG |
383 | goto error; |
384 | } | |
385 | ||
54012638 | 386 | /* Kernel tracer metadata creation */ |
f3ed775e | 387 | ret = kernctl_open_metadata(session->fd, &lkm->conf->attr); |
aaf26714 | 388 | if (ret < 0) { |
74024a21 | 389 | goto error_open; |
aaf26714 DG |
390 | } |
391 | ||
8c0faa1d | 392 | lkm->fd = ret; |
7b395890 DG |
393 | /* Prevent fd duplication after execlp() */ |
394 | ret = fcntl(lkm->fd, F_SETFD, FD_CLOEXEC); | |
395 | if (ret < 0) { | |
df0f840b | 396 | PERROR("fcntl session fd"); |
7b395890 DG |
397 | } |
398 | ||
aaf26714 | 399 | session->metadata = lkm; |
8c0faa1d | 400 | |
00e2e675 | 401 | DBG("Kernel metadata opened (fd: %d)", lkm->fd); |
8c0faa1d DG |
402 | |
403 | return 0; | |
404 | ||
74024a21 DG |
405 | error_open: |
406 | trace_kernel_destroy_metadata(lkm); | |
8c0faa1d | 407 | error: |
54012638 | 408 | return -1; |
8c0faa1d DG |
409 | } |
410 | ||
411 | /* | |
050349bb | 412 | * Start tracing session. |
8c0faa1d DG |
413 | */ |
414 | int kernel_start_session(struct ltt_kernel_session *session) | |
415 | { | |
416 | int ret; | |
417 | ||
0525e9ae DG |
418 | assert(session); |
419 | ||
8c0faa1d DG |
420 | ret = kernctl_start_session(session->fd); |
421 | if (ret < 0) { | |
df0f840b | 422 | PERROR("ioctl start session"); |
8c0faa1d DG |
423 | goto error; |
424 | } | |
425 | ||
426 | DBG("Kernel session started"); | |
427 | ||
428 | return 0; | |
429 | ||
430 | error: | |
431 | return ret; | |
432 | } | |
433 | ||
f3ed775e | 434 | /* |
050349bb | 435 | * Make a kernel wait to make sure in-flight probe have completed. |
f3ed775e DG |
436 | */ |
437 | void kernel_wait_quiescent(int fd) | |
438 | { | |
439 | int ret; | |
440 | ||
441 | DBG("Kernel quiescent wait on %d", fd); | |
442 | ||
443 | ret = kernctl_wait_quiescent(fd); | |
444 | if (ret < 0) { | |
df0f840b | 445 | PERROR("wait quiescent ioctl"); |
f3ed775e DG |
446 | ERR("Kernel quiescent wait failed"); |
447 | } | |
448 | } | |
449 | ||
d0254c7c | 450 | /* |
050349bb | 451 | * Kernel calibrate |
d0254c7c MD |
452 | */ |
453 | int kernel_calibrate(int fd, struct lttng_kernel_calibrate *calibrate) | |
454 | { | |
455 | int ret; | |
456 | ||
0525e9ae DG |
457 | assert(calibrate); |
458 | ||
d0254c7c MD |
459 | ret = kernctl_calibrate(fd, calibrate); |
460 | if (ret < 0) { | |
df0f840b | 461 | PERROR("calibrate ioctl"); |
d0254c7c MD |
462 | return -1; |
463 | } | |
464 | ||
465 | return 0; | |
466 | } | |
467 | ||
468 | ||
f3ed775e | 469 | /* |
f3ed775e DG |
470 | * Force flush buffer of metadata. |
471 | */ | |
472 | int kernel_metadata_flush_buffer(int fd) | |
473 | { | |
474 | int ret; | |
475 | ||
169d2cb7 DG |
476 | DBG("Kernel flushing metadata buffer on fd %d", fd); |
477 | ||
f3ed775e DG |
478 | ret = kernctl_buffer_flush(fd); |
479 | if (ret < 0) { | |
00e2e675 | 480 | ERR("Fail to flush metadata buffers %d (ret: %d)", fd, ret); |
f3ed775e DG |
481 | } |
482 | ||
483 | return 0; | |
484 | } | |
485 | ||
486 | /* | |
050349bb | 487 | * Force flush buffer for channel. |
f3ed775e DG |
488 | */ |
489 | int kernel_flush_buffer(struct ltt_kernel_channel *channel) | |
490 | { | |
491 | int ret; | |
492 | struct ltt_kernel_stream *stream; | |
493 | ||
0525e9ae DG |
494 | assert(channel); |
495 | ||
f3ed775e DG |
496 | DBG("Flush buffer for channel %s", channel->channel->name); |
497 | ||
498 | cds_list_for_each_entry(stream, &channel->stream_list.head, list) { | |
499 | DBG("Flushing channel stream %d", stream->fd); | |
500 | ret = kernctl_buffer_flush(stream->fd); | |
501 | if (ret < 0) { | |
df0f840b | 502 | PERROR("ioctl"); |
f3ed775e DG |
503 | ERR("Fail to flush buffer for stream %d (ret: %d)", |
504 | stream->fd, ret); | |
505 | } | |
506 | } | |
507 | ||
508 | return 0; | |
509 | } | |
510 | ||
8c0faa1d | 511 | /* |
050349bb | 512 | * Stop tracing session. |
8c0faa1d DG |
513 | */ |
514 | int kernel_stop_session(struct ltt_kernel_session *session) | |
515 | { | |
516 | int ret; | |
517 | ||
0525e9ae DG |
518 | assert(session); |
519 | ||
8c0faa1d DG |
520 | ret = kernctl_stop_session(session->fd); |
521 | if (ret < 0) { | |
522 | goto error; | |
523 | } | |
524 | ||
525 | DBG("Kernel session stopped"); | |
526 | ||
527 | return 0; | |
528 | ||
529 | error: | |
530 | return ret; | |
531 | } | |
532 | ||
533 | /* | |
050349bb DG |
534 | * Open stream of channel, register it to the kernel tracer and add it |
535 | * to the stream list of the channel. | |
8c0faa1d | 536 | * |
050349bb | 537 | * Return the number of created stream. Else, a negative value. |
8c0faa1d | 538 | */ |
f3ed775e | 539 | int kernel_open_channel_stream(struct ltt_kernel_channel *channel) |
8c0faa1d | 540 | { |
00e2e675 | 541 | int ret, count = 0; |
8c0faa1d DG |
542 | struct ltt_kernel_stream *lks; |
543 | ||
0525e9ae DG |
544 | assert(channel); |
545 | ||
5a47c6a2 | 546 | while ((ret = kernctl_create_stream(channel->fd)) >= 0) { |
00e2e675 | 547 | lks = trace_kernel_create_stream(channel->channel->name, count); |
8c0faa1d | 548 | if (lks == NULL) { |
799e2c4f MD |
549 | ret = close(ret); |
550 | if (ret) { | |
551 | PERROR("close"); | |
552 | } | |
8c0faa1d DG |
553 | goto error; |
554 | } | |
555 | ||
556 | lks->fd = ret; | |
7b395890 DG |
557 | /* Prevent fd duplication after execlp() */ |
558 | ret = fcntl(lks->fd, F_SETFD, FD_CLOEXEC); | |
559 | if (ret < 0) { | |
df0f840b | 560 | PERROR("fcntl session fd"); |
7b395890 DG |
561 | } |
562 | ||
1624d5b7 JD |
563 | lks->tracefile_size = channel->channel->attr.tracefile_size; |
564 | lks->tracefile_count = channel->channel->attr.tracefile_count; | |
565 | ||
54012638 | 566 | /* Add stream to channe stream list */ |
8c0faa1d DG |
567 | cds_list_add(&lks->list, &channel->stream_list.head); |
568 | channel->stream_count++; | |
8c0faa1d | 569 | |
00e2e675 DG |
570 | /* Increment counter which represent CPU number. */ |
571 | count++; | |
572 | ||
573 | DBG("Kernel stream %s created (fd: %d, state: %d)", lks->name, lks->fd, | |
574 | lks->state); | |
54012638 | 575 | } |
8c0faa1d DG |
576 | |
577 | return channel->stream_count; | |
578 | ||
579 | error: | |
54012638 | 580 | return -1; |
8c0faa1d DG |
581 | } |
582 | ||
583 | /* | |
050349bb | 584 | * Open the metadata stream and set it to the kernel session. |
8c0faa1d | 585 | */ |
f3ed775e | 586 | int kernel_open_metadata_stream(struct ltt_kernel_session *session) |
8c0faa1d DG |
587 | { |
588 | int ret; | |
589 | ||
0525e9ae DG |
590 | assert(session); |
591 | ||
8c0faa1d DG |
592 | ret = kernctl_create_stream(session->metadata->fd); |
593 | if (ret < 0) { | |
df0f840b | 594 | PERROR("kernel create metadata stream"); |
8c0faa1d DG |
595 | goto error; |
596 | } | |
597 | ||
598 | DBG("Kernel metadata stream created (fd: %d)", ret); | |
599 | session->metadata_stream_fd = ret; | |
7b395890 DG |
600 | /* Prevent fd duplication after execlp() */ |
601 | ret = fcntl(session->metadata_stream_fd, F_SETFD, FD_CLOEXEC); | |
602 | if (ret < 0) { | |
df0f840b | 603 | PERROR("fcntl session fd"); |
7b395890 | 604 | } |
aaf26714 DG |
605 | |
606 | return 0; | |
607 | ||
608 | error: | |
54012638 | 609 | return -1; |
aaf26714 | 610 | } |
2ef84c95 DG |
611 | |
612 | /* | |
9f19cc17 | 613 | * Get the event list from the kernel tracer and return the number of elements. |
2ef84c95 | 614 | */ |
9f19cc17 | 615 | ssize_t kernel_list_events(int tracer_fd, struct lttng_event **events) |
2ef84c95 | 616 | { |
53efb85a | 617 | int fd, ret; |
9f19cc17 DG |
618 | char *event; |
619 | size_t nbmem, count = 0; | |
2ef84c95 | 620 | FILE *fp; |
9f19cc17 | 621 | struct lttng_event *elist; |
2ef84c95 | 622 | |
0525e9ae DG |
623 | assert(events); |
624 | ||
2ef84c95 DG |
625 | fd = kernctl_tracepoint_list(tracer_fd); |
626 | if (fd < 0) { | |
df0f840b | 627 | PERROR("kernel tracepoint list"); |
2ef84c95 DG |
628 | goto error; |
629 | } | |
630 | ||
631 | fp = fdopen(fd, "r"); | |
632 | if (fp == NULL) { | |
df0f840b | 633 | PERROR("kernel tracepoint list fdopen"); |
61b73b12 | 634 | goto error_fp; |
2ef84c95 DG |
635 | } |
636 | ||
637 | /* | |
638 | * Init memory size counter | |
639 | * See kernel-ctl.h for explanation of this value | |
640 | */ | |
6725fe19 | 641 | nbmem = KERNEL_EVENT_INIT_LIST_SIZE; |
ba7f0ae5 | 642 | elist = zmalloc(sizeof(struct lttng_event) * nbmem); |
3b870559 MD |
643 | if (elist == NULL) { |
644 | PERROR("alloc list events"); | |
645 | count = -ENOMEM; | |
646 | goto end; | |
647 | } | |
2ef84c95 | 648 | |
53efb85a | 649 | while (fscanf(fp, "event { name = %m[^;]; };\n", &event) == 1) { |
6725fe19 | 650 | if (count >= nbmem) { |
3b870559 | 651 | struct lttng_event *new_elist; |
53efb85a | 652 | size_t new_nbmem; |
3b870559 | 653 | |
53efb85a MD |
654 | new_nbmem = nbmem << 1; |
655 | DBG("Reallocating event list from %zu to %zu bytes", | |
656 | nbmem, new_nbmem); | |
657 | new_elist = realloc(elist, new_nbmem * sizeof(struct lttng_event)); | |
3b870559 | 658 | if (new_elist == NULL) { |
df0f840b | 659 | PERROR("realloc list events"); |
3b870559 MD |
660 | free(event); |
661 | free(elist); | |
61b73b12 MD |
662 | count = -ENOMEM; |
663 | goto end; | |
2ef84c95 | 664 | } |
53efb85a MD |
665 | /* Zero the new memory */ |
666 | memset(new_elist + nbmem, 0, | |
667 | (new_nbmem - nbmem) * sizeof(struct lttng_event)); | |
668 | nbmem = new_nbmem; | |
3b870559 | 669 | elist = new_elist; |
2ef84c95 | 670 | } |
99497cd0 MD |
671 | strncpy(elist[count].name, event, LTTNG_SYMBOL_NAME_LEN); |
672 | elist[count].name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0'; | |
67b9d018 | 673 | elist[count].enabled = -1; |
9f19cc17 | 674 | count++; |
3b870559 | 675 | free(event); |
2ef84c95 DG |
676 | } |
677 | ||
9f19cc17 | 678 | *events = elist; |
ced2f820 | 679 | DBG("Kernel list events done (%zu events)", count); |
61b73b12 | 680 | end: |
799e2c4f MD |
681 | ret = fclose(fp); /* closes both fp and fd */ |
682 | if (ret) { | |
683 | PERROR("fclose"); | |
684 | } | |
9f19cc17 | 685 | return count; |
2ef84c95 | 686 | |
61b73b12 | 687 | error_fp: |
799e2c4f MD |
688 | ret = close(fd); |
689 | if (ret) { | |
690 | PERROR("close"); | |
691 | } | |
2ef84c95 DG |
692 | error: |
693 | return -1; | |
694 | } | |
096102bd DG |
695 | |
696 | /* | |
697 | * Get kernel version and validate it. | |
698 | */ | |
699 | int kernel_validate_version(int tracer_fd) | |
700 | { | |
701 | int ret; | |
702 | struct lttng_kernel_tracer_version version; | |
084cb5fe | 703 | struct lttng_kernel_tracer_abi_version abi_version; |
096102bd DG |
704 | |
705 | ret = kernctl_tracer_version(tracer_fd, &version); | |
706 | if (ret < 0) { | |
707 | ERR("Failed at getting the lttng-modules version"); | |
708 | goto error; | |
709 | } | |
710 | ||
711 | /* Validate version */ | |
084cb5fe MD |
712 | if (version.major != VERSION_MAJOR) { |
713 | ERR("Kernel tracer major version (%d) is not compatible with lttng-tools major version (%d)", | |
714 | version.major, VERSION_MAJOR); | |
096102bd | 715 | goto error_version; |
096102bd | 716 | } |
084cb5fe MD |
717 | ret = kernctl_tracer_abi_version(tracer_fd, &abi_version); |
718 | if (ret < 0) { | |
719 | ERR("Failed at getting lttng-modules ABI version"); | |
720 | goto error; | |
721 | } | |
722 | if (abi_version.major != LTTNG_MODULES_ABI_MAJOR_VERSION) { | |
723 | ERR("Kernel tracer ABI version (%d.%d) is not compatible with expected ABI major version (%d.*)", | |
724 | abi_version.major, abi_version.minor, | |
725 | LTTNG_MODULES_ABI_MAJOR_VERSION); | |
726 | goto error; | |
727 | } | |
728 | DBG2("Kernel tracer version validated (%d.%d, ABI %d.%d)", | |
729 | version.major, version.minor, | |
730 | abi_version.major, abi_version.minor); | |
096102bd DG |
731 | return 0; |
732 | ||
733 | error_version: | |
096102bd DG |
734 | ret = -1; |
735 | ||
736 | error: | |
737 | return ret; | |
738 | } | |
335a95b7 MD |
739 | |
740 | /* | |
741 | * Kernel work-arounds called at the start of sessiond main(). | |
742 | */ | |
743 | int init_kernel_workarounds(void) | |
744 | { | |
8936c33a | 745 | int ret; |
335a95b7 MD |
746 | FILE *fp; |
747 | ||
748 | /* | |
749 | * boot_id needs to be read once before being used concurrently | |
750 | * to deal with a Linux kernel race. A fix is proposed for | |
751 | * upstream, but the work-around is needed for older kernels. | |
752 | */ | |
753 | fp = fopen("/proc/sys/kernel/random/boot_id", "r"); | |
754 | if (!fp) { | |
755 | goto end_boot_id; | |
756 | } | |
757 | while (!feof(fp)) { | |
758 | char buf[37] = ""; | |
759 | ||
8936c33a DG |
760 | ret = fread(buf, 1, sizeof(buf), fp); |
761 | if (ret < 0) { | |
762 | /* Ignore error, we don't really care */ | |
763 | } | |
335a95b7 | 764 | } |
799e2c4f MD |
765 | ret = fclose(fp); |
766 | if (ret) { | |
767 | PERROR("fclose"); | |
768 | } | |
335a95b7 | 769 | end_boot_id: |
335a95b7 MD |
770 | return 0; |
771 | } | |
2f77fc4b DG |
772 | |
773 | /* | |
774 | * Complete teardown of a kernel session. | |
775 | */ | |
776 | void kernel_destroy_session(struct ltt_kernel_session *ksess) | |
777 | { | |
778 | if (ksess == NULL) { | |
779 | DBG3("No kernel session when tearing down session"); | |
780 | return; | |
781 | } | |
782 | ||
783 | DBG("Tearing down kernel session"); | |
784 | ||
07b86b52 | 785 | /* |
15dc512a DG |
786 | * Destroy channels on the consumer if at least one FD has been sent and we |
787 | * are in no output mode because the streams are in *no* monitor mode so we | |
788 | * have to send a command to clean them up or else they leaked. | |
07b86b52 | 789 | */ |
15dc512a | 790 | if (!ksess->output_traces && ksess->consumer_fds_sent) { |
07b86b52 JD |
791 | int ret; |
792 | struct consumer_socket *socket; | |
793 | struct lttng_ht_iter iter; | |
794 | ||
795 | /* For each consumer socket. */ | |
e4074462 | 796 | rcu_read_lock(); |
07b86b52 JD |
797 | cds_lfht_for_each_entry(ksess->consumer->socks->ht, &iter.iter, |
798 | socket, node.node) { | |
799 | struct ltt_kernel_channel *chan; | |
800 | ||
801 | /* For each channel, ask the consumer to destroy it. */ | |
802 | cds_list_for_each_entry(chan, &ksess->channel_list.head, list) { | |
803 | ret = kernel_consumer_destroy_channel(socket, chan); | |
804 | if (ret < 0) { | |
805 | /* Consumer is probably dead. Use next socket. */ | |
806 | continue; | |
807 | } | |
808 | } | |
809 | } | |
e4074462 | 810 | rcu_read_unlock(); |
07b86b52 JD |
811 | } |
812 | ||
2f77fc4b DG |
813 | /* Close any relayd session */ |
814 | consumer_output_send_destroy_relayd(ksess->consumer); | |
815 | ||
816 | trace_kernel_destroy_session(ksess); | |
817 | } | |
fb5f35b6 DG |
818 | |
819 | /* | |
820 | * Destroy a kernel channel object. It does not do anything on the tracer side. | |
821 | */ | |
822 | void kernel_destroy_channel(struct ltt_kernel_channel *kchan) | |
823 | { | |
824 | struct ltt_kernel_session *ksess = NULL; | |
825 | ||
826 | assert(kchan); | |
827 | assert(kchan->channel); | |
828 | ||
829 | DBG3("Kernel destroy channel %s", kchan->channel->name); | |
830 | ||
831 | /* Update channel count of associated session. */ | |
832 | if (kchan->session) { | |
833 | /* Keep pointer reference so we can update it after the destroy. */ | |
834 | ksess = kchan->session; | |
835 | } | |
836 | ||
837 | trace_kernel_destroy_channel(kchan); | |
838 | ||
839 | /* | |
840 | * At this point the kernel channel is not visible anymore. This is safe | |
841 | * since in order to work on a visible kernel session, the tracing session | |
842 | * lock (ltt_session.lock) MUST be acquired. | |
843 | */ | |
844 | if (ksess) { | |
845 | ksess->channel_count--; | |
846 | } | |
847 | } | |
6dc3064a DG |
848 | |
849 | /* | |
850 | * Take a snapshot for a given kernel session. | |
851 | * | |
2a06df8d | 852 | * Return 0 on success or else return a LTTNG_ERR code. |
6dc3064a DG |
853 | */ |
854 | int kernel_snapshot_record(struct ltt_kernel_session *ksess, | |
135347bd MD |
855 | struct snapshot_output *output, int wait, |
856 | uint64_t nb_packets_per_stream) | |
6dc3064a | 857 | { |
2a06df8d | 858 | int err, ret, saved_metadata_fd; |
6dc3064a DG |
859 | struct consumer_socket *socket; |
860 | struct lttng_ht_iter iter; | |
861 | struct ltt_kernel_metadata *saved_metadata; | |
862 | ||
863 | assert(ksess); | |
864 | assert(ksess->consumer); | |
865 | assert(output); | |
866 | ||
867 | DBG("Kernel snapshot record started"); | |
868 | ||
869 | /* Save current metadata since the following calls will change it. */ | |
870 | saved_metadata = ksess->metadata; | |
871 | saved_metadata_fd = ksess->metadata_stream_fd; | |
872 | ||
873 | rcu_read_lock(); | |
874 | ||
875 | ret = kernel_open_metadata(ksess); | |
876 | if (ret < 0) { | |
877 | ret = LTTNG_ERR_KERN_META_FAIL; | |
878 | goto error; | |
879 | } | |
880 | ||
881 | ret = kernel_open_metadata_stream(ksess); | |
882 | if (ret < 0) { | |
883 | ret = LTTNG_ERR_KERN_META_FAIL; | |
884 | goto error_open_stream; | |
885 | } | |
886 | ||
887 | /* Send metadata to consumer and snapshot everything. */ | |
888 | cds_lfht_for_each_entry(ksess->consumer->socks->ht, &iter.iter, | |
889 | socket, node.node) { | |
890 | struct consumer_output *saved_output; | |
891 | struct ltt_kernel_channel *chan; | |
6dc3064a DG |
892 | |
893 | /* | |
894 | * Temporarly switch consumer output for our snapshot output. As long | |
895 | * as the session lock is taken, this is safe. | |
896 | */ | |
897 | saved_output = ksess->consumer; | |
898 | ksess->consumer = output->consumer; | |
899 | ||
900 | pthread_mutex_lock(socket->lock); | |
901 | /* This stream must not be monitored by the consumer. */ | |
07b86b52 | 902 | ret = kernel_consumer_add_metadata(socket, ksess, 0); |
6dc3064a | 903 | pthread_mutex_unlock(socket->lock); |
07b86b52 | 904 | /* Put back the saved consumer output into the session. */ |
6dc3064a DG |
905 | ksess->consumer = saved_output; |
906 | if (ret < 0) { | |
907 | ret = LTTNG_ERR_KERN_CONSUMER_FAIL; | |
908 | goto error_consumer; | |
909 | } | |
910 | ||
911 | /* For each channel, ask the consumer to snapshot it. */ | |
912 | cds_list_for_each_entry(chan, &ksess->channel_list.head, list) { | |
07b86b52 | 913 | pthread_mutex_lock(socket->lock); |
6dc3064a | 914 | ret = consumer_snapshot_channel(socket, chan->fd, output, 0, |
5c786ded JD |
915 | ksess->uid, ksess->gid, |
916 | DEFAULT_KERNEL_TRACE_DIR, wait, | |
135347bd | 917 | nb_packets_per_stream); |
07b86b52 | 918 | pthread_mutex_unlock(socket->lock); |
6dc3064a DG |
919 | if (ret < 0) { |
920 | ret = LTTNG_ERR_KERN_CONSUMER_FAIL; | |
2a06df8d DG |
921 | (void) kernel_consumer_destroy_metadata(socket, |
922 | ksess->metadata); | |
6dc3064a DG |
923 | goto error_consumer; |
924 | } | |
925 | } | |
926 | ||
927 | /* Snapshot metadata, */ | |
07b86b52 | 928 | pthread_mutex_lock(socket->lock); |
6dc3064a | 929 | ret = consumer_snapshot_channel(socket, ksess->metadata->fd, output, |
5c786ded | 930 | 1, ksess->uid, ksess->gid, |
135347bd | 931 | DEFAULT_KERNEL_TRACE_DIR, wait, 0); |
07b86b52 | 932 | pthread_mutex_unlock(socket->lock); |
6dc3064a DG |
933 | if (ret < 0) { |
934 | ret = LTTNG_ERR_KERN_CONSUMER_FAIL; | |
935 | goto error_consumer; | |
936 | } | |
07b86b52 JD |
937 | |
938 | /* | |
939 | * The metadata snapshot is done, ask the consumer to destroy it since | |
940 | * it's not monitored on the consumer side. | |
941 | */ | |
942 | (void) kernel_consumer_destroy_metadata(socket, ksess->metadata); | |
6dc3064a DG |
943 | } |
944 | ||
fac41e72 DG |
945 | ret = LTTNG_OK; |
946 | ||
6dc3064a DG |
947 | error_consumer: |
948 | /* Close newly opened metadata stream. It's now on the consumer side. */ | |
2a06df8d DG |
949 | err = close(ksess->metadata_stream_fd); |
950 | if (err < 0) { | |
6dc3064a DG |
951 | PERROR("close snapshot kernel"); |
952 | } | |
953 | ||
954 | error_open_stream: | |
955 | trace_kernel_destroy_metadata(ksess->metadata); | |
956 | error: | |
957 | /* Restore metadata state.*/ | |
958 | ksess->metadata = saved_metadata; | |
959 | ksess->metadata_stream_fd = saved_metadata_fd; | |
960 | ||
961 | rcu_read_unlock(); | |
962 | return ret; | |
963 | } | |
834978fd DG |
964 | |
965 | /* | |
966 | * Get the syscall mask array from the kernel tracer. | |
967 | * | |
968 | * Return 0 on success else a negative value. In both case, syscall_mask should | |
969 | * be freed. | |
970 | */ | |
971 | int kernel_syscall_mask(int chan_fd, char **syscall_mask, uint32_t *nr_bits) | |
972 | { | |
973 | assert(syscall_mask); | |
974 | assert(nr_bits); | |
975 | ||
976 | return kernctl_syscall_mask(chan_fd, syscall_mask, nr_bits); | |
977 | } |