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 |
6c1c0768 | 19 | #define _LGPL_SOURCE |
20fe2104 | 20 | #include <errno.h> |
7b395890 | 21 | #include <fcntl.h> |
20fe2104 DG |
22 | #include <stdlib.h> |
23 | #include <stdio.h> | |
f34daff7 | 24 | #include <string.h> |
8c0faa1d | 25 | #include <unistd.h> |
77c7c900 | 26 | #include <inttypes.h> |
20fe2104 | 27 | |
990570ed | 28 | #include <common/common.h> |
db758600 | 29 | #include <common/kernel-ctl/kernel-ctl.h> |
c052142c | 30 | #include <common/kernel-ctl/kernel-ioctl.h> |
42224349 | 31 | #include <common/sessiond-comm/sessiond-comm.h> |
1e307fab | 32 | |
2f77fc4b | 33 | #include "consumer.h" |
4771f025 | 34 | #include "kernel.h" |
6dc3064a | 35 | #include "kernel-consumer.h" |
096102bd | 36 | #include "kern-modules.h" |
834978fd | 37 | #include "utils.h" |
20fe2104 | 38 | |
d65106b1 | 39 | /* |
050349bb | 40 | * Add context on a kernel channel. |
d65106b1 DG |
41 | */ |
42 | int kernel_add_channel_context(struct ltt_kernel_channel *chan, | |
645328ae | 43 | struct ltt_kernel_context *ctx) |
d65106b1 DG |
44 | { |
45 | int ret; | |
46 | ||
0525e9ae DG |
47 | assert(chan); |
48 | assert(ctx); | |
49 | ||
d65106b1 | 50 | DBG("Adding context to channel %s", chan->channel->name); |
645328ae | 51 | ret = kernctl_add_context(chan->fd, &ctx->ctx); |
d65106b1 | 52 | if (ret < 0) { |
b579acd9 | 53 | if (errno != EEXIST) { |
df0f840b | 54 | PERROR("add context ioctl"); |
b579acd9 DG |
55 | } else { |
56 | /* If EEXIST, we just ignore the error */ | |
57 | ret = 0; | |
58 | } | |
d65106b1 DG |
59 | goto error; |
60 | } | |
61 | ||
645328ae | 62 | cds_list_add_tail(&ctx->list, &chan->ctx_list); |
d65106b1 DG |
63 | |
64 | return 0; | |
65 | ||
66 | error: | |
67 | return ret; | |
68 | } | |
69 | ||
20fe2104 | 70 | /* |
050349bb DG |
71 | * Create a new kernel session, register it to the kernel tracer and add it to |
72 | * the session daemon session. | |
20fe2104 | 73 | */ |
8c0faa1d | 74 | int kernel_create_session(struct ltt_session *session, int tracer_fd) |
20fe2104 DG |
75 | { |
76 | int ret; | |
77 | struct ltt_kernel_session *lks; | |
78 | ||
0525e9ae DG |
79 | assert(session); |
80 | ||
54012638 | 81 | /* Allocate data structure */ |
dec56f6c | 82 | lks = trace_kernel_create_session(); |
20fe2104 | 83 | if (lks == NULL) { |
54012638 | 84 | ret = -1; |
20fe2104 DG |
85 | goto error; |
86 | } | |
87 | ||
54012638 | 88 | /* Kernel tracer session creation */ |
20fe2104 DG |
89 | ret = kernctl_create_session(tracer_fd); |
90 | if (ret < 0) { | |
df0f840b | 91 | PERROR("ioctl kernel create session"); |
20fe2104 DG |
92 | goto error; |
93 | } | |
94 | ||
20fe2104 | 95 | lks->fd = ret; |
7b395890 DG |
96 | /* Prevent fd duplication after execlp() */ |
97 | ret = fcntl(lks->fd, F_SETFD, FD_CLOEXEC); | |
98 | if (ret < 0) { | |
df0f840b | 99 | PERROR("fcntl session fd"); |
7b395890 DG |
100 | } |
101 | ||
53632229 | 102 | lks->id = session->id; |
3bd1e081 | 103 | lks->consumer_fds_sent = 0; |
8c0faa1d | 104 | session->kernel_session = lks; |
8c0faa1d DG |
105 | |
106 | DBG("Kernel session created (fd: %d)", lks->fd); | |
20fe2104 DG |
107 | |
108 | return 0; | |
109 | ||
110 | error: | |
5f62c685 DG |
111 | if (lks) { |
112 | trace_kernel_destroy_session(lks); | |
113 | } | |
20fe2104 DG |
114 | return ret; |
115 | } | |
116 | ||
117 | /* | |
050349bb DG |
118 | * Create a kernel channel, register it to the kernel tracer and add it to the |
119 | * kernel session. | |
20fe2104 | 120 | */ |
050349bb | 121 | int kernel_create_channel(struct ltt_kernel_session *session, |
fdd9eb17 | 122 | struct lttng_channel *chan) |
20fe2104 DG |
123 | { |
124 | int ret; | |
125 | struct ltt_kernel_channel *lkc; | |
20fe2104 | 126 | |
0525e9ae DG |
127 | assert(session); |
128 | assert(chan); | |
0525e9ae | 129 | |
54012638 | 130 | /* Allocate kernel channel */ |
fdd9eb17 | 131 | lkc = trace_kernel_create_channel(chan); |
54012638 | 132 | if (lkc == NULL) { |
20fe2104 DG |
133 | goto error; |
134 | } | |
135 | ||
ecc48a90 | 136 | DBG3("Kernel create channel %s with attr: %d, %" PRIu64 ", %" PRIu64 ", %u, %u, %d, %d", |
fdd9eb17 | 137 | chan->name, lkc->channel->attr.overwrite, |
173af62f DG |
138 | lkc->channel->attr.subbuf_size, lkc->channel->attr.num_subbuf, |
139 | lkc->channel->attr.switch_timer_interval, lkc->channel->attr.read_timer_interval, | |
ecc48a90 | 140 | lkc->channel->attr.live_timer_interval, lkc->channel->attr.output); |
173af62f | 141 | |
54012638 | 142 | /* Kernel tracer channel creation */ |
f3ed775e | 143 | ret = kernctl_create_channel(session->fd, &lkc->channel->attr); |
20fe2104 | 144 | if (ret < 0) { |
df0f840b | 145 | PERROR("ioctl kernel create channel"); |
20fe2104 DG |
146 | goto error; |
147 | } | |
148 | ||
54012638 | 149 | /* Setup the channel fd */ |
20fe2104 | 150 | lkc->fd = ret; |
7b395890 DG |
151 | /* Prevent fd duplication after execlp() */ |
152 | ret = fcntl(lkc->fd, F_SETFD, FD_CLOEXEC); | |
153 | if (ret < 0) { | |
df0f840b | 154 | PERROR("fcntl session fd"); |
7b395890 DG |
155 | } |
156 | ||
54012638 | 157 | /* Add channel to session */ |
8c0faa1d DG |
158 | cds_list_add(&lkc->list, &session->channel_list.head); |
159 | session->channel_count++; | |
fb5f35b6 | 160 | lkc->session = session; |
20fe2104 | 161 | |
00e2e675 | 162 | DBG("Kernel channel %s created (fd: %d)", lkc->channel->name, lkc->fd); |
20fe2104 DG |
163 | |
164 | return 0; | |
165 | ||
166 | error: | |
5f62c685 DG |
167 | if (lkc) { |
168 | free(lkc->channel); | |
169 | free(lkc); | |
170 | } | |
54012638 | 171 | return -1; |
20fe2104 | 172 | } |
f34daff7 DG |
173 | |
174 | /* | |
050349bb DG |
175 | * Create a kernel event, enable it to the kernel tracer and add it to the |
176 | * channel event list of the kernel session. | |
49d21f93 | 177 | * We own filter_expression and filter. |
f34daff7 | 178 | */ |
050349bb | 179 | int kernel_create_event(struct lttng_event *ev, |
00a62084 MD |
180 | struct ltt_kernel_channel *channel, |
181 | char *filter_expression, | |
182 | struct lttng_filter_bytecode *filter) | |
f34daff7 DG |
183 | { |
184 | int ret; | |
185 | struct ltt_kernel_event *event; | |
f34daff7 | 186 | |
0525e9ae DG |
187 | assert(ev); |
188 | assert(channel); | |
189 | ||
00a62084 MD |
190 | event = trace_kernel_create_event(ev, filter_expression, |
191 | filter); | |
54012638 | 192 | if (event == NULL) { |
d87bfb32 | 193 | ret = -1; |
f34daff7 DG |
194 | goto error; |
195 | } | |
196 | ||
f3ed775e DG |
197 | ret = kernctl_create_event(channel->fd, event->event); |
198 | if (ret < 0) { | |
bd29c13d DG |
199 | switch (errno) { |
200 | case EEXIST: | |
201 | break; | |
202 | case ENOSYS: | |
203 | WARN("Event type not implemented"); | |
204 | break; | |
8197a339 DG |
205 | case ENOENT: |
206 | WARN("Event %s not found!", ev->name); | |
207 | break; | |
bd29c13d | 208 | default: |
d87bfb32 DG |
209 | PERROR("create event ioctl"); |
210 | } | |
211 | ret = -errno; | |
e953ef25 | 212 | goto free_event; |
8c0faa1d | 213 | } |
f34daff7 | 214 | |
d0ae4ea8 | 215 | event->type = ev->type; |
f3ed775e | 216 | event->fd = ret; |
7b395890 DG |
217 | /* Prevent fd duplication after execlp() */ |
218 | ret = fcntl(event->fd, F_SETFD, FD_CLOEXEC); | |
219 | if (ret < 0) { | |
df0f840b | 220 | PERROR("fcntl session fd"); |
7b395890 DG |
221 | } |
222 | ||
00a62084 MD |
223 | if (filter) { |
224 | ret = kernctl_filter(event->fd, filter); | |
225 | if (ret) { | |
226 | goto filter_error; | |
227 | } | |
228 | } | |
229 | ||
230 | ret = kernctl_enable(event->fd); | |
231 | if (ret < 0) { | |
232 | switch (errno) { | |
233 | case EEXIST: | |
234 | ret = LTTNG_ERR_KERN_EVENT_EXIST; | |
235 | break; | |
236 | default: | |
237 | PERROR("enable kernel event"); | |
238 | break; | |
239 | } | |
240 | goto enable_error; | |
241 | } | |
242 | ||
f3ed775e DG |
243 | /* Add event to event list */ |
244 | cds_list_add(&event->list, &channel->events_list.head); | |
cbbbb275 DG |
245 | channel->event_count++; |
246 | ||
e953ef25 DG |
247 | DBG("Event %s created (fd: %d)", ev->name, event->fd); |
248 | ||
249 | return 0; | |
250 | ||
00a62084 MD |
251 | enable_error: |
252 | filter_error: | |
253 | { | |
254 | int closeret; | |
255 | ||
256 | closeret = close(event->fd); | |
257 | if (closeret) { | |
258 | PERROR("close event fd"); | |
259 | } | |
260 | } | |
e953ef25 DG |
261 | free_event: |
262 | free(event); | |
263 | error: | |
d87bfb32 | 264 | return ret; |
e953ef25 DG |
265 | } |
266 | ||
26cc6b4e | 267 | /* |
050349bb | 268 | * Disable a kernel channel. |
26cc6b4e DG |
269 | */ |
270 | int kernel_disable_channel(struct ltt_kernel_channel *chan) | |
271 | { | |
272 | int ret; | |
273 | ||
0525e9ae DG |
274 | assert(chan); |
275 | ||
26cc6b4e DG |
276 | ret = kernctl_disable(chan->fd); |
277 | if (ret < 0) { | |
df0f840b | 278 | PERROR("disable chan ioctl"); |
26cc6b4e DG |
279 | ret = errno; |
280 | goto error; | |
281 | } | |
282 | ||
283 | chan->enabled = 0; | |
284 | DBG("Kernel channel %s disabled (fd: %d)", chan->channel->name, chan->fd); | |
285 | ||
286 | return 0; | |
287 | ||
288 | error: | |
289 | return ret; | |
290 | } | |
291 | ||
d36b8583 | 292 | /* |
050349bb | 293 | * Enable a kernel channel. |
d36b8583 DG |
294 | */ |
295 | int kernel_enable_channel(struct ltt_kernel_channel *chan) | |
296 | { | |
297 | int ret; | |
298 | ||
0525e9ae DG |
299 | assert(chan); |
300 | ||
d36b8583 | 301 | ret = kernctl_enable(chan->fd); |
54d01ffb | 302 | if (ret < 0 && errno != EEXIST) { |
df0f840b | 303 | PERROR("Enable kernel chan"); |
d36b8583 DG |
304 | goto error; |
305 | } | |
306 | ||
307 | chan->enabled = 1; | |
308 | DBG("Kernel channel %s enabled (fd: %d)", chan->channel->name, chan->fd); | |
309 | ||
310 | return 0; | |
311 | ||
312 | error: | |
313 | return ret; | |
314 | } | |
315 | ||
19e70852 | 316 | /* |
050349bb | 317 | * Enable a kernel event. |
19e70852 DG |
318 | */ |
319 | int kernel_enable_event(struct ltt_kernel_event *event) | |
320 | { | |
321 | int ret; | |
322 | ||
0525e9ae DG |
323 | assert(event); |
324 | ||
19e70852 | 325 | ret = kernctl_enable(event->fd); |
42224349 DG |
326 | if (ret < 0) { |
327 | switch (errno) { | |
328 | case EEXIST: | |
f73fabfd | 329 | ret = LTTNG_ERR_KERN_EVENT_EXIST; |
42224349 DG |
330 | break; |
331 | default: | |
332 | PERROR("enable kernel event"); | |
333 | break; | |
334 | } | |
19e70852 DG |
335 | goto error; |
336 | } | |
337 | ||
338 | event->enabled = 1; | |
339 | DBG("Kernel event %s enabled (fd: %d)", event->event->name, event->fd); | |
340 | ||
341 | return 0; | |
342 | ||
343 | error: | |
d36b8583 | 344 | return ret; |
19e70852 DG |
345 | } |
346 | ||
e953ef25 | 347 | /* |
050349bb | 348 | * Disable a kernel event. |
e953ef25 | 349 | */ |
19e70852 | 350 | int kernel_disable_event(struct ltt_kernel_event *event) |
e953ef25 DG |
351 | { |
352 | int ret; | |
19e70852 | 353 | |
0525e9ae DG |
354 | assert(event); |
355 | ||
19e70852 | 356 | ret = kernctl_disable(event->fd); |
42224349 DG |
357 | if (ret < 0) { |
358 | switch (errno) { | |
359 | case EEXIST: | |
f73fabfd | 360 | ret = LTTNG_ERR_KERN_EVENT_EXIST; |
42224349 DG |
361 | break; |
362 | default: | |
363 | PERROR("disable kernel event"); | |
364 | break; | |
365 | } | |
19e70852 | 366 | goto error; |
e953ef25 | 367 | } |
f3ed775e | 368 | |
19e70852 DG |
369 | event->enabled = 0; |
370 | DBG("Kernel event %s disabled (fd: %d)", event->event->name, event->fd); | |
371 | ||
f34daff7 DG |
372 | return 0; |
373 | ||
374 | error: | |
d36b8583 | 375 | return ret; |
f34daff7 | 376 | } |
aaf26714 | 377 | |
6e911cad | 378 | |
ccf10263 MD |
379 | int kernel_track_pid(struct ltt_kernel_session *session, int pid) |
380 | { | |
381 | DBG("Kernel track PID %d for session id %" PRIu64 ".", | |
382 | pid, session->id); | |
383 | return kernctl_track_pid(session->fd, pid); | |
384 | } | |
385 | ||
386 | int kernel_untrack_pid(struct ltt_kernel_session *session, int pid) | |
387 | { | |
388 | DBG("Kernel untrack PID %d for session id %" PRIu64 ".", | |
389 | pid, session->id); | |
390 | return kernctl_untrack_pid(session->fd, pid); | |
391 | } | |
392 | ||
a5dfbb9d MD |
393 | ssize_t kernel_list_tracker_pids(struct ltt_kernel_session *session, |
394 | int **_pids) | |
395 | { | |
396 | int fd, ret; | |
397 | int pid; | |
398 | ssize_t nbmem, count = 0; | |
399 | FILE *fp; | |
400 | int *pids; | |
401 | ||
402 | fd = kernctl_list_tracker_pids(session->fd); | |
403 | if (fd < 0) { | |
404 | PERROR("kernel tracker pids list"); | |
405 | goto error; | |
406 | } | |
407 | ||
408 | fp = fdopen(fd, "r"); | |
409 | if (fp == NULL) { | |
410 | PERROR("kernel tracker pids list fdopen"); | |
411 | goto error_fp; | |
412 | } | |
413 | ||
414 | nbmem = KERNEL_TRACKER_PIDS_INIT_LIST_SIZE; | |
415 | pids = zmalloc(sizeof(*pids) * nbmem); | |
416 | if (pids == NULL) { | |
417 | PERROR("alloc list pids"); | |
418 | count = -ENOMEM; | |
419 | goto end; | |
420 | } | |
421 | ||
422 | while (fscanf(fp, "process { pid = %u; };\n", &pid) == 1) { | |
423 | if (count >= nbmem) { | |
424 | int *new_pids; | |
425 | size_t new_nbmem; | |
426 | ||
427 | new_nbmem = nbmem << 1; | |
428 | DBG("Reallocating pids list from %zu to %zu entries", | |
429 | nbmem, new_nbmem); | |
430 | new_pids = realloc(pids, new_nbmem * sizeof(*new_pids)); | |
431 | if (new_pids == NULL) { | |
432 | PERROR("realloc list events"); | |
433 | free(pids); | |
434 | count = -ENOMEM; | |
435 | goto end; | |
436 | } | |
437 | /* Zero the new memory */ | |
438 | memset(new_pids + nbmem, 0, | |
439 | (new_nbmem - nbmem) * sizeof(*new_pids)); | |
440 | nbmem = new_nbmem; | |
441 | pids = new_pids; | |
442 | } | |
443 | pids[count++] = pid; | |
444 | } | |
445 | ||
446 | *_pids = pids; | |
447 | DBG("Kernel list tracker pids done (%zd pids)", count); | |
448 | end: | |
449 | ret = fclose(fp); /* closes both fp and fd */ | |
450 | if (ret) { | |
451 | PERROR("fclose"); | |
452 | } | |
453 | return count; | |
454 | ||
455 | error_fp: | |
456 | ret = close(fd); | |
457 | if (ret) { | |
458 | PERROR("close"); | |
459 | } | |
460 | error: | |
461 | return -1; | |
462 | } | |
463 | ||
aaf26714 | 464 | /* |
050349bb DG |
465 | * Create kernel metadata, open from the kernel tracer and add it to the |
466 | * kernel session. | |
aaf26714 | 467 | */ |
a4b92340 | 468 | int kernel_open_metadata(struct ltt_kernel_session *session) |
aaf26714 DG |
469 | { |
470 | int ret; | |
74024a21 | 471 | struct ltt_kernel_metadata *lkm = NULL; |
aaf26714 | 472 | |
0525e9ae DG |
473 | assert(session); |
474 | ||
54012638 | 475 | /* Allocate kernel metadata */ |
a4b92340 | 476 | lkm = trace_kernel_create_metadata(); |
54012638 | 477 | if (lkm == NULL) { |
aaf26714 DG |
478 | goto error; |
479 | } | |
480 | ||
54012638 | 481 | /* Kernel tracer metadata creation */ |
f3ed775e | 482 | ret = kernctl_open_metadata(session->fd, &lkm->conf->attr); |
aaf26714 | 483 | if (ret < 0) { |
74024a21 | 484 | goto error_open; |
aaf26714 DG |
485 | } |
486 | ||
8c0faa1d | 487 | lkm->fd = ret; |
7b395890 DG |
488 | /* Prevent fd duplication after execlp() */ |
489 | ret = fcntl(lkm->fd, F_SETFD, FD_CLOEXEC); | |
490 | if (ret < 0) { | |
df0f840b | 491 | PERROR("fcntl session fd"); |
7b395890 DG |
492 | } |
493 | ||
aaf26714 | 494 | session->metadata = lkm; |
8c0faa1d | 495 | |
00e2e675 | 496 | DBG("Kernel metadata opened (fd: %d)", lkm->fd); |
8c0faa1d DG |
497 | |
498 | return 0; | |
499 | ||
74024a21 DG |
500 | error_open: |
501 | trace_kernel_destroy_metadata(lkm); | |
8c0faa1d | 502 | error: |
54012638 | 503 | return -1; |
8c0faa1d DG |
504 | } |
505 | ||
506 | /* | |
050349bb | 507 | * Start tracing session. |
8c0faa1d DG |
508 | */ |
509 | int kernel_start_session(struct ltt_kernel_session *session) | |
510 | { | |
511 | int ret; | |
512 | ||
0525e9ae DG |
513 | assert(session); |
514 | ||
8c0faa1d DG |
515 | ret = kernctl_start_session(session->fd); |
516 | if (ret < 0) { | |
df0f840b | 517 | PERROR("ioctl start session"); |
8c0faa1d DG |
518 | goto error; |
519 | } | |
520 | ||
521 | DBG("Kernel session started"); | |
522 | ||
523 | return 0; | |
524 | ||
525 | error: | |
526 | return ret; | |
527 | } | |
528 | ||
f3ed775e | 529 | /* |
050349bb | 530 | * Make a kernel wait to make sure in-flight probe have completed. |
f3ed775e DG |
531 | */ |
532 | void kernel_wait_quiescent(int fd) | |
533 | { | |
534 | int ret; | |
535 | ||
536 | DBG("Kernel quiescent wait on %d", fd); | |
537 | ||
538 | ret = kernctl_wait_quiescent(fd); | |
539 | if (ret < 0) { | |
df0f840b | 540 | PERROR("wait quiescent ioctl"); |
f3ed775e DG |
541 | ERR("Kernel quiescent wait failed"); |
542 | } | |
543 | } | |
544 | ||
d0254c7c | 545 | /* |
050349bb | 546 | * Kernel calibrate |
d0254c7c MD |
547 | */ |
548 | int kernel_calibrate(int fd, struct lttng_kernel_calibrate *calibrate) | |
549 | { | |
550 | int ret; | |
551 | ||
0525e9ae DG |
552 | assert(calibrate); |
553 | ||
d0254c7c MD |
554 | ret = kernctl_calibrate(fd, calibrate); |
555 | if (ret < 0) { | |
df0f840b | 556 | PERROR("calibrate ioctl"); |
d0254c7c MD |
557 | return -1; |
558 | } | |
559 | ||
560 | return 0; | |
561 | } | |
562 | ||
563 | ||
f3ed775e | 564 | /* |
f3ed775e DG |
565 | * Force flush buffer of metadata. |
566 | */ | |
567 | int kernel_metadata_flush_buffer(int fd) | |
568 | { | |
569 | int ret; | |
570 | ||
169d2cb7 DG |
571 | DBG("Kernel flushing metadata buffer on fd %d", fd); |
572 | ||
f3ed775e DG |
573 | ret = kernctl_buffer_flush(fd); |
574 | if (ret < 0) { | |
00e2e675 | 575 | ERR("Fail to flush metadata buffers %d (ret: %d)", fd, ret); |
f3ed775e DG |
576 | } |
577 | ||
578 | return 0; | |
579 | } | |
580 | ||
581 | /* | |
050349bb | 582 | * Force flush buffer for channel. |
f3ed775e DG |
583 | */ |
584 | int kernel_flush_buffer(struct ltt_kernel_channel *channel) | |
585 | { | |
586 | int ret; | |
587 | struct ltt_kernel_stream *stream; | |
588 | ||
0525e9ae DG |
589 | assert(channel); |
590 | ||
f3ed775e DG |
591 | DBG("Flush buffer for channel %s", channel->channel->name); |
592 | ||
593 | cds_list_for_each_entry(stream, &channel->stream_list.head, list) { | |
594 | DBG("Flushing channel stream %d", stream->fd); | |
595 | ret = kernctl_buffer_flush(stream->fd); | |
596 | if (ret < 0) { | |
df0f840b | 597 | PERROR("ioctl"); |
f3ed775e DG |
598 | ERR("Fail to flush buffer for stream %d (ret: %d)", |
599 | stream->fd, ret); | |
600 | } | |
601 | } | |
602 | ||
603 | return 0; | |
604 | } | |
605 | ||
8c0faa1d | 606 | /* |
050349bb | 607 | * Stop tracing session. |
8c0faa1d DG |
608 | */ |
609 | int kernel_stop_session(struct ltt_kernel_session *session) | |
610 | { | |
611 | int ret; | |
612 | ||
0525e9ae DG |
613 | assert(session); |
614 | ||
8c0faa1d DG |
615 | ret = kernctl_stop_session(session->fd); |
616 | if (ret < 0) { | |
617 | goto error; | |
618 | } | |
619 | ||
620 | DBG("Kernel session stopped"); | |
621 | ||
622 | return 0; | |
623 | ||
624 | error: | |
625 | return ret; | |
626 | } | |
627 | ||
628 | /* | |
050349bb DG |
629 | * Open stream of channel, register it to the kernel tracer and add it |
630 | * to the stream list of the channel. | |
8c0faa1d | 631 | * |
050349bb | 632 | * Return the number of created stream. Else, a negative value. |
8c0faa1d | 633 | */ |
f3ed775e | 634 | int kernel_open_channel_stream(struct ltt_kernel_channel *channel) |
8c0faa1d | 635 | { |
00e2e675 | 636 | int ret, count = 0; |
8c0faa1d DG |
637 | struct ltt_kernel_stream *lks; |
638 | ||
0525e9ae DG |
639 | assert(channel); |
640 | ||
5a47c6a2 | 641 | while ((ret = kernctl_create_stream(channel->fd)) >= 0) { |
00e2e675 | 642 | lks = trace_kernel_create_stream(channel->channel->name, count); |
8c0faa1d | 643 | if (lks == NULL) { |
799e2c4f MD |
644 | ret = close(ret); |
645 | if (ret) { | |
646 | PERROR("close"); | |
647 | } | |
8c0faa1d DG |
648 | goto error; |
649 | } | |
650 | ||
651 | lks->fd = ret; | |
7b395890 DG |
652 | /* Prevent fd duplication after execlp() */ |
653 | ret = fcntl(lks->fd, F_SETFD, FD_CLOEXEC); | |
654 | if (ret < 0) { | |
df0f840b | 655 | PERROR("fcntl session fd"); |
7b395890 DG |
656 | } |
657 | ||
1624d5b7 JD |
658 | lks->tracefile_size = channel->channel->attr.tracefile_size; |
659 | lks->tracefile_count = channel->channel->attr.tracefile_count; | |
660 | ||
54012638 | 661 | /* Add stream to channe stream list */ |
8c0faa1d DG |
662 | cds_list_add(&lks->list, &channel->stream_list.head); |
663 | channel->stream_count++; | |
8c0faa1d | 664 | |
00e2e675 DG |
665 | /* Increment counter which represent CPU number. */ |
666 | count++; | |
667 | ||
668 | DBG("Kernel stream %s created (fd: %d, state: %d)", lks->name, lks->fd, | |
669 | lks->state); | |
54012638 | 670 | } |
8c0faa1d DG |
671 | |
672 | return channel->stream_count; | |
673 | ||
674 | error: | |
54012638 | 675 | return -1; |
8c0faa1d DG |
676 | } |
677 | ||
678 | /* | |
050349bb | 679 | * Open the metadata stream and set it to the kernel session. |
8c0faa1d | 680 | */ |
f3ed775e | 681 | int kernel_open_metadata_stream(struct ltt_kernel_session *session) |
8c0faa1d DG |
682 | { |
683 | int ret; | |
684 | ||
0525e9ae DG |
685 | assert(session); |
686 | ||
8c0faa1d DG |
687 | ret = kernctl_create_stream(session->metadata->fd); |
688 | if (ret < 0) { | |
df0f840b | 689 | PERROR("kernel create metadata stream"); |
8c0faa1d DG |
690 | goto error; |
691 | } | |
692 | ||
693 | DBG("Kernel metadata stream created (fd: %d)", ret); | |
694 | session->metadata_stream_fd = ret; | |
7b395890 DG |
695 | /* Prevent fd duplication after execlp() */ |
696 | ret = fcntl(session->metadata_stream_fd, F_SETFD, FD_CLOEXEC); | |
697 | if (ret < 0) { | |
df0f840b | 698 | PERROR("fcntl session fd"); |
7b395890 | 699 | } |
aaf26714 DG |
700 | |
701 | return 0; | |
702 | ||
703 | error: | |
54012638 | 704 | return -1; |
aaf26714 | 705 | } |
2ef84c95 DG |
706 | |
707 | /* | |
9f19cc17 | 708 | * Get the event list from the kernel tracer and return the number of elements. |
2ef84c95 | 709 | */ |
9f19cc17 | 710 | ssize_t kernel_list_events(int tracer_fd, struct lttng_event **events) |
2ef84c95 | 711 | { |
53efb85a | 712 | int fd, ret; |
9f19cc17 DG |
713 | char *event; |
714 | size_t nbmem, count = 0; | |
2ef84c95 | 715 | FILE *fp; |
9f19cc17 | 716 | struct lttng_event *elist; |
2ef84c95 | 717 | |
0525e9ae DG |
718 | assert(events); |
719 | ||
2ef84c95 DG |
720 | fd = kernctl_tracepoint_list(tracer_fd); |
721 | if (fd < 0) { | |
df0f840b | 722 | PERROR("kernel tracepoint list"); |
2ef84c95 DG |
723 | goto error; |
724 | } | |
725 | ||
726 | fp = fdopen(fd, "r"); | |
727 | if (fp == NULL) { | |
df0f840b | 728 | PERROR("kernel tracepoint list fdopen"); |
61b73b12 | 729 | goto error_fp; |
2ef84c95 DG |
730 | } |
731 | ||
732 | /* | |
733 | * Init memory size counter | |
734 | * See kernel-ctl.h for explanation of this value | |
735 | */ | |
6725fe19 | 736 | nbmem = KERNEL_EVENT_INIT_LIST_SIZE; |
ba7f0ae5 | 737 | elist = zmalloc(sizeof(struct lttng_event) * nbmem); |
3b870559 MD |
738 | if (elist == NULL) { |
739 | PERROR("alloc list events"); | |
740 | count = -ENOMEM; | |
741 | goto end; | |
742 | } | |
2ef84c95 | 743 | |
53efb85a | 744 | while (fscanf(fp, "event { name = %m[^;]; };\n", &event) == 1) { |
6725fe19 | 745 | if (count >= nbmem) { |
3b870559 | 746 | struct lttng_event *new_elist; |
53efb85a | 747 | size_t new_nbmem; |
3b870559 | 748 | |
53efb85a MD |
749 | new_nbmem = nbmem << 1; |
750 | DBG("Reallocating event list from %zu to %zu bytes", | |
751 | nbmem, new_nbmem); | |
752 | new_elist = realloc(elist, new_nbmem * sizeof(struct lttng_event)); | |
3b870559 | 753 | if (new_elist == NULL) { |
df0f840b | 754 | PERROR("realloc list events"); |
3b870559 MD |
755 | free(event); |
756 | free(elist); | |
61b73b12 MD |
757 | count = -ENOMEM; |
758 | goto end; | |
2ef84c95 | 759 | } |
53efb85a MD |
760 | /* Zero the new memory */ |
761 | memset(new_elist + nbmem, 0, | |
762 | (new_nbmem - nbmem) * sizeof(struct lttng_event)); | |
763 | nbmem = new_nbmem; | |
3b870559 | 764 | elist = new_elist; |
2ef84c95 | 765 | } |
99497cd0 MD |
766 | strncpy(elist[count].name, event, LTTNG_SYMBOL_NAME_LEN); |
767 | elist[count].name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0'; | |
67b9d018 | 768 | elist[count].enabled = -1; |
9f19cc17 | 769 | count++; |
3b870559 | 770 | free(event); |
2ef84c95 DG |
771 | } |
772 | ||
9f19cc17 | 773 | *events = elist; |
ced2f820 | 774 | DBG("Kernel list events done (%zu events)", count); |
61b73b12 | 775 | end: |
799e2c4f MD |
776 | ret = fclose(fp); /* closes both fp and fd */ |
777 | if (ret) { | |
778 | PERROR("fclose"); | |
779 | } | |
9f19cc17 | 780 | return count; |
2ef84c95 | 781 | |
61b73b12 | 782 | error_fp: |
799e2c4f MD |
783 | ret = close(fd); |
784 | if (ret) { | |
785 | PERROR("close"); | |
786 | } | |
2ef84c95 DG |
787 | error: |
788 | return -1; | |
789 | } | |
096102bd DG |
790 | |
791 | /* | |
792 | * Get kernel version and validate it. | |
793 | */ | |
794 | int kernel_validate_version(int tracer_fd) | |
795 | { | |
796 | int ret; | |
797 | struct lttng_kernel_tracer_version version; | |
c052142c | 798 | struct lttng_kernel_tracer_abi_version abi_version; |
096102bd DG |
799 | |
800 | ret = kernctl_tracer_version(tracer_fd, &version); | |
801 | if (ret < 0) { | |
802 | ERR("Failed at getting the lttng-modules version"); | |
803 | goto error; | |
804 | } | |
805 | ||
806 | /* Validate version */ | |
c052142c MD |
807 | if (version.major != VERSION_MAJOR) { |
808 | ERR("Kernel tracer major version (%d) is not compatible with lttng-tools major version (%d)", | |
809 | version.major, VERSION_MAJOR); | |
096102bd | 810 | goto error_version; |
096102bd | 811 | } |
c052142c MD |
812 | ret = kernctl_tracer_abi_version(tracer_fd, &abi_version); |
813 | if (ret < 0) { | |
814 | ERR("Failed at getting lttng-modules ABI version"); | |
815 | goto error; | |
816 | } | |
817 | if (abi_version.major != LTTNG_MODULES_ABI_MAJOR_VERSION) { | |
818 | ERR("Kernel tracer ABI version (%d.%d) is not compatible with expected ABI major version (%d.*)", | |
819 | abi_version.major, abi_version.minor, | |
820 | LTTNG_MODULES_ABI_MAJOR_VERSION); | |
821 | goto error; | |
822 | } | |
823 | DBG2("Kernel tracer version validated (%d.%d, ABI %d.%d)", | |
824 | version.major, version.minor, | |
825 | abi_version.major, abi_version.minor); | |
096102bd DG |
826 | return 0; |
827 | ||
828 | error_version: | |
096102bd DG |
829 | ret = -1; |
830 | ||
831 | error: | |
832 | return ret; | |
833 | } | |
335a95b7 MD |
834 | |
835 | /* | |
836 | * Kernel work-arounds called at the start of sessiond main(). | |
837 | */ | |
838 | int init_kernel_workarounds(void) | |
839 | { | |
8936c33a | 840 | int ret; |
335a95b7 MD |
841 | FILE *fp; |
842 | ||
843 | /* | |
844 | * boot_id needs to be read once before being used concurrently | |
845 | * to deal with a Linux kernel race. A fix is proposed for | |
846 | * upstream, but the work-around is needed for older kernels. | |
847 | */ | |
848 | fp = fopen("/proc/sys/kernel/random/boot_id", "r"); | |
849 | if (!fp) { | |
850 | goto end_boot_id; | |
851 | } | |
852 | while (!feof(fp)) { | |
853 | char buf[37] = ""; | |
854 | ||
8936c33a DG |
855 | ret = fread(buf, 1, sizeof(buf), fp); |
856 | if (ret < 0) { | |
857 | /* Ignore error, we don't really care */ | |
858 | } | |
335a95b7 | 859 | } |
799e2c4f MD |
860 | ret = fclose(fp); |
861 | if (ret) { | |
862 | PERROR("fclose"); | |
863 | } | |
335a95b7 | 864 | end_boot_id: |
335a95b7 MD |
865 | return 0; |
866 | } | |
2f77fc4b DG |
867 | |
868 | /* | |
869 | * Complete teardown of a kernel session. | |
870 | */ | |
871 | void kernel_destroy_session(struct ltt_kernel_session *ksess) | |
872 | { | |
873 | if (ksess == NULL) { | |
874 | DBG3("No kernel session when tearing down session"); | |
875 | return; | |
876 | } | |
877 | ||
878 | DBG("Tearing down kernel session"); | |
879 | ||
07b86b52 | 880 | /* |
15dc512a DG |
881 | * Destroy channels on the consumer if at least one FD has been sent and we |
882 | * are in no output mode because the streams are in *no* monitor mode so we | |
883 | * have to send a command to clean them up or else they leaked. | |
07b86b52 | 884 | */ |
15dc512a | 885 | if (!ksess->output_traces && ksess->consumer_fds_sent) { |
07b86b52 JD |
886 | int ret; |
887 | struct consumer_socket *socket; | |
888 | struct lttng_ht_iter iter; | |
889 | ||
890 | /* For each consumer socket. */ | |
d069d577 | 891 | rcu_read_lock(); |
07b86b52 JD |
892 | cds_lfht_for_each_entry(ksess->consumer->socks->ht, &iter.iter, |
893 | socket, node.node) { | |
894 | struct ltt_kernel_channel *chan; | |
895 | ||
896 | /* For each channel, ask the consumer to destroy it. */ | |
897 | cds_list_for_each_entry(chan, &ksess->channel_list.head, list) { | |
898 | ret = kernel_consumer_destroy_channel(socket, chan); | |
899 | if (ret < 0) { | |
900 | /* Consumer is probably dead. Use next socket. */ | |
901 | continue; | |
902 | } | |
903 | } | |
904 | } | |
d069d577 | 905 | rcu_read_unlock(); |
07b86b52 JD |
906 | } |
907 | ||
2f77fc4b DG |
908 | /* Close any relayd session */ |
909 | consumer_output_send_destroy_relayd(ksess->consumer); | |
910 | ||
911 | trace_kernel_destroy_session(ksess); | |
912 | } | |
fb5f35b6 DG |
913 | |
914 | /* | |
915 | * Destroy a kernel channel object. It does not do anything on the tracer side. | |
916 | */ | |
917 | void kernel_destroy_channel(struct ltt_kernel_channel *kchan) | |
918 | { | |
919 | struct ltt_kernel_session *ksess = NULL; | |
920 | ||
921 | assert(kchan); | |
922 | assert(kchan->channel); | |
923 | ||
924 | DBG3("Kernel destroy channel %s", kchan->channel->name); | |
925 | ||
926 | /* Update channel count of associated session. */ | |
927 | if (kchan->session) { | |
928 | /* Keep pointer reference so we can update it after the destroy. */ | |
929 | ksess = kchan->session; | |
930 | } | |
931 | ||
932 | trace_kernel_destroy_channel(kchan); | |
933 | ||
934 | /* | |
935 | * At this point the kernel channel is not visible anymore. This is safe | |
936 | * since in order to work on a visible kernel session, the tracing session | |
937 | * lock (ltt_session.lock) MUST be acquired. | |
938 | */ | |
939 | if (ksess) { | |
940 | ksess->channel_count--; | |
941 | } | |
942 | } | |
6dc3064a DG |
943 | |
944 | /* | |
945 | * Take a snapshot for a given kernel session. | |
946 | * | |
2a06df8d | 947 | * Return 0 on success or else return a LTTNG_ERR code. |
6dc3064a DG |
948 | */ |
949 | int kernel_snapshot_record(struct ltt_kernel_session *ksess, | |
d07ceecd MD |
950 | struct snapshot_output *output, int wait, |
951 | uint64_t nb_packets_per_stream) | |
6dc3064a | 952 | { |
2a06df8d | 953 | int err, ret, saved_metadata_fd; |
6dc3064a DG |
954 | struct consumer_socket *socket; |
955 | struct lttng_ht_iter iter; | |
956 | struct ltt_kernel_metadata *saved_metadata; | |
957 | ||
958 | assert(ksess); | |
959 | assert(ksess->consumer); | |
960 | assert(output); | |
961 | ||
962 | DBG("Kernel snapshot record started"); | |
963 | ||
964 | /* Save current metadata since the following calls will change it. */ | |
965 | saved_metadata = ksess->metadata; | |
966 | saved_metadata_fd = ksess->metadata_stream_fd; | |
967 | ||
968 | rcu_read_lock(); | |
969 | ||
970 | ret = kernel_open_metadata(ksess); | |
971 | if (ret < 0) { | |
972 | ret = LTTNG_ERR_KERN_META_FAIL; | |
973 | goto error; | |
974 | } | |
975 | ||
976 | ret = kernel_open_metadata_stream(ksess); | |
977 | if (ret < 0) { | |
978 | ret = LTTNG_ERR_KERN_META_FAIL; | |
979 | goto error_open_stream; | |
980 | } | |
981 | ||
982 | /* Send metadata to consumer and snapshot everything. */ | |
983 | cds_lfht_for_each_entry(ksess->consumer->socks->ht, &iter.iter, | |
984 | socket, node.node) { | |
985 | struct consumer_output *saved_output; | |
986 | struct ltt_kernel_channel *chan; | |
6dc3064a DG |
987 | |
988 | /* | |
989 | * Temporarly switch consumer output for our snapshot output. As long | |
990 | * as the session lock is taken, this is safe. | |
991 | */ | |
992 | saved_output = ksess->consumer; | |
993 | ksess->consumer = output->consumer; | |
994 | ||
995 | pthread_mutex_lock(socket->lock); | |
996 | /* This stream must not be monitored by the consumer. */ | |
07b86b52 | 997 | ret = kernel_consumer_add_metadata(socket, ksess, 0); |
6dc3064a | 998 | pthread_mutex_unlock(socket->lock); |
07b86b52 | 999 | /* Put back the saved consumer output into the session. */ |
6dc3064a DG |
1000 | ksess->consumer = saved_output; |
1001 | if (ret < 0) { | |
1002 | ret = LTTNG_ERR_KERN_CONSUMER_FAIL; | |
1003 | goto error_consumer; | |
1004 | } | |
1005 | ||
1006 | /* For each channel, ask the consumer to snapshot it. */ | |
1007 | cds_list_for_each_entry(chan, &ksess->channel_list.head, list) { | |
07b86b52 | 1008 | pthread_mutex_lock(socket->lock); |
6dc3064a | 1009 | ret = consumer_snapshot_channel(socket, chan->fd, output, 0, |
5c786ded JD |
1010 | ksess->uid, ksess->gid, |
1011 | DEFAULT_KERNEL_TRACE_DIR, wait, | |
d07ceecd | 1012 | nb_packets_per_stream); |
07b86b52 | 1013 | pthread_mutex_unlock(socket->lock); |
6dc3064a DG |
1014 | if (ret < 0) { |
1015 | ret = LTTNG_ERR_KERN_CONSUMER_FAIL; | |
2a06df8d DG |
1016 | (void) kernel_consumer_destroy_metadata(socket, |
1017 | ksess->metadata); | |
6dc3064a DG |
1018 | goto error_consumer; |
1019 | } | |
1020 | } | |
1021 | ||
1022 | /* Snapshot metadata, */ | |
07b86b52 | 1023 | pthread_mutex_lock(socket->lock); |
6dc3064a | 1024 | ret = consumer_snapshot_channel(socket, ksess->metadata->fd, output, |
5c786ded | 1025 | 1, ksess->uid, ksess->gid, |
d07ceecd | 1026 | DEFAULT_KERNEL_TRACE_DIR, wait, 0); |
07b86b52 | 1027 | pthread_mutex_unlock(socket->lock); |
6dc3064a DG |
1028 | if (ret < 0) { |
1029 | ret = LTTNG_ERR_KERN_CONSUMER_FAIL; | |
1030 | goto error_consumer; | |
1031 | } | |
07b86b52 JD |
1032 | |
1033 | /* | |
1034 | * The metadata snapshot is done, ask the consumer to destroy it since | |
1035 | * it's not monitored on the consumer side. | |
1036 | */ | |
1037 | (void) kernel_consumer_destroy_metadata(socket, ksess->metadata); | |
6dc3064a DG |
1038 | } |
1039 | ||
fac41e72 DG |
1040 | ret = LTTNG_OK; |
1041 | ||
6dc3064a DG |
1042 | error_consumer: |
1043 | /* Close newly opened metadata stream. It's now on the consumer side. */ | |
2a06df8d DG |
1044 | err = close(ksess->metadata_stream_fd); |
1045 | if (err < 0) { | |
6dc3064a DG |
1046 | PERROR("close snapshot kernel"); |
1047 | } | |
1048 | ||
1049 | error_open_stream: | |
1050 | trace_kernel_destroy_metadata(ksess->metadata); | |
1051 | error: | |
1052 | /* Restore metadata state.*/ | |
1053 | ksess->metadata = saved_metadata; | |
1054 | ksess->metadata_stream_fd = saved_metadata_fd; | |
1055 | ||
1056 | rcu_read_unlock(); | |
1057 | return ret; | |
1058 | } | |
834978fd DG |
1059 | |
1060 | /* | |
1061 | * Get the syscall mask array from the kernel tracer. | |
1062 | * | |
1063 | * Return 0 on success else a negative value. In both case, syscall_mask should | |
1064 | * be freed. | |
1065 | */ | |
1066 | int kernel_syscall_mask(int chan_fd, char **syscall_mask, uint32_t *nr_bits) | |
1067 | { | |
1068 | assert(syscall_mask); | |
1069 | assert(nr_bits); | |
1070 | ||
1071 | return kernctl_syscall_mask(chan_fd, syscall_mask, nr_bits); | |
1072 | } |