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 | ||
6c1c0768 | 18 | #define _LGPL_SOURCE |
7b395890 | 19 | #include <fcntl.h> |
20fe2104 DG |
20 | #include <stdlib.h> |
21 | #include <stdio.h> | |
f34daff7 | 22 | #include <string.h> |
8c0faa1d | 23 | #include <unistd.h> |
77c7c900 | 24 | #include <inttypes.h> |
20fe2104 | 25 | |
990570ed | 26 | #include <common/common.h> |
db758600 | 27 | #include <common/kernel-ctl/kernel-ctl.h> |
c052142c | 28 | #include <common/kernel-ctl/kernel-ioctl.h> |
42224349 | 29 | #include <common/sessiond-comm/sessiond-comm.h> |
1e307fab | 30 | |
2f77fc4b | 31 | #include "consumer.h" |
4771f025 | 32 | #include "kernel.h" |
6dc3064a | 33 | #include "kernel-consumer.h" |
096102bd | 34 | #include "kern-modules.h" |
834978fd | 35 | #include "utils.h" |
20fe2104 | 36 | |
d65106b1 | 37 | /* |
050349bb | 38 | * Add context on a kernel channel. |
b5d133fc JG |
39 | * |
40 | * Assumes the ownership of ctx. | |
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) { |
32af2c95 | 53 | switch (-ret) { |
1ae5e83e JD |
54 | case ENOSYS: |
55 | /* Exists but not available for this kernel */ | |
56 | ret = LTTNG_ERR_KERN_CONTEXT_UNAVAILABLE; | |
57 | goto error; | |
58 | case EEXIST: | |
b579acd9 DG |
59 | /* If EEXIST, we just ignore the error */ |
60 | ret = 0; | |
1ae5e83e JD |
61 | goto end; |
62 | default: | |
63 | PERROR("add context ioctl"); | |
64 | ret = LTTNG_ERR_KERN_CONTEXT_FAIL; | |
65 | goto error; | |
b579acd9 | 66 | } |
d65106b1 | 67 | } |
1cacb121 | 68 | ret = 0; |
d65106b1 | 69 | |
1ae5e83e | 70 | end: |
645328ae | 71 | cds_list_add_tail(&ctx->list, &chan->ctx_list); |
2b64f14c | 72 | ctx->in_list = true; |
b5d133fc | 73 | ctx = NULL; |
d65106b1 | 74 | error: |
b5d133fc JG |
75 | if (ctx) { |
76 | trace_kernel_destroy_context(ctx); | |
77 | } | |
d65106b1 DG |
78 | return ret; |
79 | } | |
80 | ||
20fe2104 | 81 | /* |
050349bb DG |
82 | * Create a new kernel session, register it to the kernel tracer and add it to |
83 | * the session daemon session. | |
20fe2104 | 84 | */ |
8c0faa1d | 85 | int kernel_create_session(struct ltt_session *session, int tracer_fd) |
20fe2104 DG |
86 | { |
87 | int ret; | |
88 | struct ltt_kernel_session *lks; | |
89 | ||
0525e9ae DG |
90 | assert(session); |
91 | ||
54012638 | 92 | /* Allocate data structure */ |
dec56f6c | 93 | lks = trace_kernel_create_session(); |
20fe2104 | 94 | if (lks == NULL) { |
54012638 | 95 | ret = -1; |
20fe2104 DG |
96 | goto error; |
97 | } | |
98 | ||
54012638 | 99 | /* Kernel tracer session creation */ |
20fe2104 DG |
100 | ret = kernctl_create_session(tracer_fd); |
101 | if (ret < 0) { | |
df0f840b | 102 | PERROR("ioctl kernel create session"); |
20fe2104 DG |
103 | goto error; |
104 | } | |
105 | ||
20fe2104 | 106 | lks->fd = ret; |
7b395890 DG |
107 | /* Prevent fd duplication after execlp() */ |
108 | ret = fcntl(lks->fd, F_SETFD, FD_CLOEXEC); | |
109 | if (ret < 0) { | |
df0f840b | 110 | PERROR("fcntl session fd"); |
7b395890 DG |
111 | } |
112 | ||
53632229 | 113 | lks->id = session->id; |
3bd1e081 | 114 | lks->consumer_fds_sent = 0; |
8c0faa1d | 115 | session->kernel_session = lks; |
8c0faa1d DG |
116 | |
117 | DBG("Kernel session created (fd: %d)", lks->fd); | |
20fe2104 DG |
118 | |
119 | return 0; | |
120 | ||
121 | error: | |
5f62c685 DG |
122 | if (lks) { |
123 | trace_kernel_destroy_session(lks); | |
124 | } | |
20fe2104 DG |
125 | return ret; |
126 | } | |
127 | ||
128 | /* | |
050349bb DG |
129 | * Create a kernel channel, register it to the kernel tracer and add it to the |
130 | * kernel session. | |
20fe2104 | 131 | */ |
050349bb | 132 | int kernel_create_channel(struct ltt_kernel_session *session, |
fdd9eb17 | 133 | struct lttng_channel *chan) |
20fe2104 DG |
134 | { |
135 | int ret; | |
136 | struct ltt_kernel_channel *lkc; | |
20fe2104 | 137 | |
0525e9ae DG |
138 | assert(session); |
139 | assert(chan); | |
0525e9ae | 140 | |
54012638 | 141 | /* Allocate kernel channel */ |
fdd9eb17 | 142 | lkc = trace_kernel_create_channel(chan); |
54012638 | 143 | if (lkc == NULL) { |
20fe2104 DG |
144 | goto error; |
145 | } | |
146 | ||
ecc48a90 | 147 | DBG3("Kernel create channel %s with attr: %d, %" PRIu64 ", %" PRIu64 ", %u, %u, %d, %d", |
fdd9eb17 | 148 | chan->name, lkc->channel->attr.overwrite, |
173af62f DG |
149 | lkc->channel->attr.subbuf_size, lkc->channel->attr.num_subbuf, |
150 | lkc->channel->attr.switch_timer_interval, lkc->channel->attr.read_timer_interval, | |
ecc48a90 | 151 | lkc->channel->attr.live_timer_interval, lkc->channel->attr.output); |
173af62f | 152 | |
54012638 | 153 | /* Kernel tracer channel creation */ |
f3ed775e | 154 | ret = kernctl_create_channel(session->fd, &lkc->channel->attr); |
20fe2104 | 155 | if (ret < 0) { |
df0f840b | 156 | PERROR("ioctl kernel create channel"); |
20fe2104 DG |
157 | goto error; |
158 | } | |
159 | ||
54012638 | 160 | /* Setup the channel fd */ |
20fe2104 | 161 | lkc->fd = ret; |
7b395890 DG |
162 | /* Prevent fd duplication after execlp() */ |
163 | ret = fcntl(lkc->fd, F_SETFD, FD_CLOEXEC); | |
164 | if (ret < 0) { | |
df0f840b | 165 | PERROR("fcntl session fd"); |
7b395890 DG |
166 | } |
167 | ||
54012638 | 168 | /* Add channel to session */ |
8c0faa1d DG |
169 | cds_list_add(&lkc->list, &session->channel_list.head); |
170 | session->channel_count++; | |
fb5f35b6 | 171 | lkc->session = session; |
20fe2104 | 172 | |
00e2e675 | 173 | DBG("Kernel channel %s created (fd: %d)", lkc->channel->name, lkc->fd); |
20fe2104 DG |
174 | |
175 | return 0; | |
176 | ||
177 | error: | |
5f62c685 DG |
178 | if (lkc) { |
179 | free(lkc->channel); | |
180 | free(lkc); | |
181 | } | |
54012638 | 182 | return -1; |
20fe2104 | 183 | } |
f34daff7 DG |
184 | |
185 | /* | |
050349bb DG |
186 | * Create a kernel event, enable it to the kernel tracer and add it to the |
187 | * channel event list of the kernel session. | |
49d21f93 | 188 | * We own filter_expression and filter. |
f34daff7 | 189 | */ |
050349bb | 190 | int kernel_create_event(struct lttng_event *ev, |
00a62084 MD |
191 | struct ltt_kernel_channel *channel, |
192 | char *filter_expression, | |
193 | struct lttng_filter_bytecode *filter) | |
f34daff7 DG |
194 | { |
195 | int ret; | |
196 | struct ltt_kernel_event *event; | |
f34daff7 | 197 | |
0525e9ae DG |
198 | assert(ev); |
199 | assert(channel); | |
200 | ||
a969e101 | 201 | /* We pass ownership of filter_expression and filter */ |
00a62084 MD |
202 | event = trace_kernel_create_event(ev, filter_expression, |
203 | filter); | |
54012638 | 204 | if (event == NULL) { |
d87bfb32 | 205 | ret = -1; |
f34daff7 DG |
206 | goto error; |
207 | } | |
208 | ||
f3ed775e DG |
209 | ret = kernctl_create_event(channel->fd, event->event); |
210 | if (ret < 0) { | |
32af2c95 | 211 | switch (-ret) { |
bd29c13d DG |
212 | case EEXIST: |
213 | break; | |
214 | case ENOSYS: | |
215 | WARN("Event type not implemented"); | |
216 | break; | |
8197a339 DG |
217 | case ENOENT: |
218 | WARN("Event %s not found!", ev->name); | |
219 | break; | |
bd29c13d | 220 | default: |
d87bfb32 DG |
221 | PERROR("create event ioctl"); |
222 | } | |
e953ef25 | 223 | goto free_event; |
8c0faa1d | 224 | } |
f34daff7 | 225 | |
d0ae4ea8 | 226 | event->type = ev->type; |
f3ed775e | 227 | event->fd = ret; |
7b395890 DG |
228 | /* Prevent fd duplication after execlp() */ |
229 | ret = fcntl(event->fd, F_SETFD, FD_CLOEXEC); | |
230 | if (ret < 0) { | |
df0f840b | 231 | PERROR("fcntl session fd"); |
7b395890 DG |
232 | } |
233 | ||
00a62084 MD |
234 | if (filter) { |
235 | ret = kernctl_filter(event->fd, filter); | |
236 | if (ret) { | |
237 | goto filter_error; | |
238 | } | |
239 | } | |
240 | ||
241 | ret = kernctl_enable(event->fd); | |
242 | if (ret < 0) { | |
32af2c95 | 243 | switch (-ret) { |
00a62084 MD |
244 | case EEXIST: |
245 | ret = LTTNG_ERR_KERN_EVENT_EXIST; | |
246 | break; | |
247 | default: | |
248 | PERROR("enable kernel event"); | |
249 | break; | |
250 | } | |
251 | goto enable_error; | |
252 | } | |
253 | ||
f3ed775e DG |
254 | /* Add event to event list */ |
255 | cds_list_add(&event->list, &channel->events_list.head); | |
cbbbb275 DG |
256 | channel->event_count++; |
257 | ||
e953ef25 DG |
258 | DBG("Event %s created (fd: %d)", ev->name, event->fd); |
259 | ||
260 | return 0; | |
261 | ||
00a62084 MD |
262 | enable_error: |
263 | filter_error: | |
264 | { | |
265 | int closeret; | |
266 | ||
267 | closeret = close(event->fd); | |
268 | if (closeret) { | |
269 | PERROR("close event fd"); | |
270 | } | |
271 | } | |
e953ef25 DG |
272 | free_event: |
273 | free(event); | |
274 | error: | |
d87bfb32 | 275 | return ret; |
e953ef25 DG |
276 | } |
277 | ||
26cc6b4e | 278 | /* |
050349bb | 279 | * Disable a kernel channel. |
26cc6b4e DG |
280 | */ |
281 | int kernel_disable_channel(struct ltt_kernel_channel *chan) | |
282 | { | |
283 | int ret; | |
284 | ||
0525e9ae DG |
285 | assert(chan); |
286 | ||
26cc6b4e DG |
287 | ret = kernctl_disable(chan->fd); |
288 | if (ret < 0) { | |
df0f840b | 289 | PERROR("disable chan ioctl"); |
26cc6b4e DG |
290 | goto error; |
291 | } | |
292 | ||
293 | chan->enabled = 0; | |
294 | DBG("Kernel channel %s disabled (fd: %d)", chan->channel->name, chan->fd); | |
295 | ||
296 | return 0; | |
297 | ||
298 | error: | |
299 | return ret; | |
300 | } | |
301 | ||
d36b8583 | 302 | /* |
050349bb | 303 | * Enable a kernel channel. |
d36b8583 DG |
304 | */ |
305 | int kernel_enable_channel(struct ltt_kernel_channel *chan) | |
306 | { | |
307 | int ret; | |
308 | ||
0525e9ae DG |
309 | assert(chan); |
310 | ||
d36b8583 | 311 | ret = kernctl_enable(chan->fd); |
32af2c95 | 312 | if (ret < 0 && ret != -EEXIST) { |
df0f840b | 313 | PERROR("Enable kernel chan"); |
d36b8583 DG |
314 | goto error; |
315 | } | |
316 | ||
317 | chan->enabled = 1; | |
318 | DBG("Kernel channel %s enabled (fd: %d)", chan->channel->name, chan->fd); | |
319 | ||
320 | return 0; | |
321 | ||
322 | error: | |
323 | return ret; | |
324 | } | |
325 | ||
19e70852 | 326 | /* |
050349bb | 327 | * Enable a kernel event. |
19e70852 DG |
328 | */ |
329 | int kernel_enable_event(struct ltt_kernel_event *event) | |
330 | { | |
331 | int ret; | |
332 | ||
0525e9ae DG |
333 | assert(event); |
334 | ||
19e70852 | 335 | ret = kernctl_enable(event->fd); |
42224349 | 336 | if (ret < 0) { |
32af2c95 | 337 | switch (-ret) { |
42224349 | 338 | case EEXIST: |
f73fabfd | 339 | ret = LTTNG_ERR_KERN_EVENT_EXIST; |
42224349 DG |
340 | break; |
341 | default: | |
342 | PERROR("enable kernel event"); | |
343 | break; | |
344 | } | |
19e70852 DG |
345 | goto error; |
346 | } | |
347 | ||
348 | event->enabled = 1; | |
349 | DBG("Kernel event %s enabled (fd: %d)", event->event->name, event->fd); | |
350 | ||
351 | return 0; | |
352 | ||
353 | error: | |
d36b8583 | 354 | return ret; |
19e70852 DG |
355 | } |
356 | ||
e953ef25 | 357 | /* |
050349bb | 358 | * Disable a kernel event. |
e953ef25 | 359 | */ |
19e70852 | 360 | int kernel_disable_event(struct ltt_kernel_event *event) |
e953ef25 DG |
361 | { |
362 | int ret; | |
19e70852 | 363 | |
0525e9ae DG |
364 | assert(event); |
365 | ||
19e70852 | 366 | ret = kernctl_disable(event->fd); |
42224349 | 367 | if (ret < 0) { |
32af2c95 | 368 | switch (-ret) { |
42224349 | 369 | case EEXIST: |
f73fabfd | 370 | ret = LTTNG_ERR_KERN_EVENT_EXIST; |
42224349 DG |
371 | break; |
372 | default: | |
373 | PERROR("disable kernel event"); | |
374 | break; | |
375 | } | |
19e70852 | 376 | goto error; |
e953ef25 | 377 | } |
f3ed775e | 378 | |
19e70852 DG |
379 | event->enabled = 0; |
380 | DBG("Kernel event %s disabled (fd: %d)", event->event->name, event->fd); | |
381 | ||
f34daff7 DG |
382 | return 0; |
383 | ||
384 | error: | |
d36b8583 | 385 | return ret; |
f34daff7 | 386 | } |
aaf26714 | 387 | |
6e911cad | 388 | |
ccf10263 MD |
389 | int kernel_track_pid(struct ltt_kernel_session *session, int pid) |
390 | { | |
7c493d31 MD |
391 | int ret; |
392 | ||
ccf10263 MD |
393 | DBG("Kernel track PID %d for session id %" PRIu64 ".", |
394 | pid, session->id); | |
7c493d31 MD |
395 | ret = kernctl_track_pid(session->fd, pid); |
396 | if (!ret) { | |
397 | return LTTNG_OK; | |
398 | } | |
32af2c95 | 399 | switch (-ret) { |
7c493d31 MD |
400 | case EINVAL: |
401 | return LTTNG_ERR_INVALID; | |
402 | case ENOMEM: | |
403 | return LTTNG_ERR_NOMEM; | |
404 | case EEXIST: | |
405 | return LTTNG_ERR_PID_TRACKED; | |
406 | default: | |
407 | return LTTNG_ERR_UNK; | |
408 | } | |
ccf10263 MD |
409 | } |
410 | ||
411 | int kernel_untrack_pid(struct ltt_kernel_session *session, int pid) | |
412 | { | |
7c493d31 MD |
413 | int ret; |
414 | ||
ccf10263 MD |
415 | DBG("Kernel untrack PID %d for session id %" PRIu64 ".", |
416 | pid, session->id); | |
7c493d31 MD |
417 | ret = kernctl_untrack_pid(session->fd, pid); |
418 | if (!ret) { | |
419 | return LTTNG_OK; | |
420 | } | |
32af2c95 | 421 | switch (-ret) { |
7c493d31 MD |
422 | case EINVAL: |
423 | return LTTNG_ERR_INVALID; | |
424 | case ENOMEM: | |
425 | return LTTNG_ERR_NOMEM; | |
426 | case ENOENT: | |
427 | return LTTNG_ERR_PID_NOT_TRACKED; | |
428 | default: | |
429 | return LTTNG_ERR_UNK; | |
430 | } | |
ccf10263 MD |
431 | } |
432 | ||
a5dfbb9d MD |
433 | ssize_t kernel_list_tracker_pids(struct ltt_kernel_session *session, |
434 | int **_pids) | |
435 | { | |
436 | int fd, ret; | |
437 | int pid; | |
438 | ssize_t nbmem, count = 0; | |
439 | FILE *fp; | |
440 | int *pids; | |
441 | ||
442 | fd = kernctl_list_tracker_pids(session->fd); | |
443 | if (fd < 0) { | |
444 | PERROR("kernel tracker pids list"); | |
445 | goto error; | |
446 | } | |
447 | ||
448 | fp = fdopen(fd, "r"); | |
449 | if (fp == NULL) { | |
450 | PERROR("kernel tracker pids list fdopen"); | |
451 | goto error_fp; | |
452 | } | |
453 | ||
454 | nbmem = KERNEL_TRACKER_PIDS_INIT_LIST_SIZE; | |
455 | pids = zmalloc(sizeof(*pids) * nbmem); | |
456 | if (pids == NULL) { | |
457 | PERROR("alloc list pids"); | |
458 | count = -ENOMEM; | |
459 | goto end; | |
460 | } | |
461 | ||
462 | while (fscanf(fp, "process { pid = %u; };\n", &pid) == 1) { | |
463 | if (count >= nbmem) { | |
464 | int *new_pids; | |
465 | size_t new_nbmem; | |
466 | ||
467 | new_nbmem = nbmem << 1; | |
468 | DBG("Reallocating pids list from %zu to %zu entries", | |
469 | nbmem, new_nbmem); | |
470 | new_pids = realloc(pids, new_nbmem * sizeof(*new_pids)); | |
471 | if (new_pids == NULL) { | |
472 | PERROR("realloc list events"); | |
473 | free(pids); | |
474 | count = -ENOMEM; | |
475 | goto end; | |
476 | } | |
477 | /* Zero the new memory */ | |
478 | memset(new_pids + nbmem, 0, | |
479 | (new_nbmem - nbmem) * sizeof(*new_pids)); | |
480 | nbmem = new_nbmem; | |
481 | pids = new_pids; | |
482 | } | |
483 | pids[count++] = pid; | |
484 | } | |
485 | ||
486 | *_pids = pids; | |
487 | DBG("Kernel list tracker pids done (%zd pids)", count); | |
488 | end: | |
489 | ret = fclose(fp); /* closes both fp and fd */ | |
490 | if (ret) { | |
491 | PERROR("fclose"); | |
492 | } | |
493 | return count; | |
494 | ||
495 | error_fp: | |
496 | ret = close(fd); | |
497 | if (ret) { | |
498 | PERROR("close"); | |
499 | } | |
500 | error: | |
501 | return -1; | |
502 | } | |
503 | ||
aaf26714 | 504 | /* |
050349bb DG |
505 | * Create kernel metadata, open from the kernel tracer and add it to the |
506 | * kernel session. | |
aaf26714 | 507 | */ |
a4b92340 | 508 | int kernel_open_metadata(struct ltt_kernel_session *session) |
aaf26714 DG |
509 | { |
510 | int ret; | |
74024a21 | 511 | struct ltt_kernel_metadata *lkm = NULL; |
aaf26714 | 512 | |
0525e9ae DG |
513 | assert(session); |
514 | ||
54012638 | 515 | /* Allocate kernel metadata */ |
a4b92340 | 516 | lkm = trace_kernel_create_metadata(); |
54012638 | 517 | if (lkm == NULL) { |
aaf26714 DG |
518 | goto error; |
519 | } | |
520 | ||
54012638 | 521 | /* Kernel tracer metadata creation */ |
f3ed775e | 522 | ret = kernctl_open_metadata(session->fd, &lkm->conf->attr); |
aaf26714 | 523 | if (ret < 0) { |
74024a21 | 524 | goto error_open; |
aaf26714 DG |
525 | } |
526 | ||
8c0faa1d | 527 | lkm->fd = ret; |
7b395890 DG |
528 | /* Prevent fd duplication after execlp() */ |
529 | ret = fcntl(lkm->fd, F_SETFD, FD_CLOEXEC); | |
530 | if (ret < 0) { | |
df0f840b | 531 | PERROR("fcntl session fd"); |
7b395890 DG |
532 | } |
533 | ||
aaf26714 | 534 | session->metadata = lkm; |
8c0faa1d | 535 | |
00e2e675 | 536 | DBG("Kernel metadata opened (fd: %d)", lkm->fd); |
8c0faa1d DG |
537 | |
538 | return 0; | |
539 | ||
74024a21 DG |
540 | error_open: |
541 | trace_kernel_destroy_metadata(lkm); | |
8c0faa1d | 542 | error: |
54012638 | 543 | return -1; |
8c0faa1d DG |
544 | } |
545 | ||
546 | /* | |
050349bb | 547 | * Start tracing session. |
8c0faa1d DG |
548 | */ |
549 | int kernel_start_session(struct ltt_kernel_session *session) | |
550 | { | |
551 | int ret; | |
552 | ||
0525e9ae DG |
553 | assert(session); |
554 | ||
8c0faa1d DG |
555 | ret = kernctl_start_session(session->fd); |
556 | if (ret < 0) { | |
df0f840b | 557 | PERROR("ioctl start session"); |
8c0faa1d DG |
558 | goto error; |
559 | } | |
560 | ||
561 | DBG("Kernel session started"); | |
562 | ||
563 | return 0; | |
564 | ||
565 | error: | |
566 | return ret; | |
567 | } | |
568 | ||
f3ed775e | 569 | /* |
050349bb | 570 | * Make a kernel wait to make sure in-flight probe have completed. |
f3ed775e DG |
571 | */ |
572 | void kernel_wait_quiescent(int fd) | |
573 | { | |
574 | int ret; | |
575 | ||
576 | DBG("Kernel quiescent wait on %d", fd); | |
577 | ||
578 | ret = kernctl_wait_quiescent(fd); | |
579 | if (ret < 0) { | |
df0f840b | 580 | PERROR("wait quiescent ioctl"); |
f3ed775e DG |
581 | ERR("Kernel quiescent wait failed"); |
582 | } | |
583 | } | |
584 | ||
585 | /* | |
f3ed775e DG |
586 | * Force flush buffer of metadata. |
587 | */ | |
588 | int kernel_metadata_flush_buffer(int fd) | |
589 | { | |
590 | int ret; | |
591 | ||
169d2cb7 DG |
592 | DBG("Kernel flushing metadata buffer on fd %d", fd); |
593 | ||
f3ed775e DG |
594 | ret = kernctl_buffer_flush(fd); |
595 | if (ret < 0) { | |
00e2e675 | 596 | ERR("Fail to flush metadata buffers %d (ret: %d)", fd, ret); |
f3ed775e DG |
597 | } |
598 | ||
599 | return 0; | |
600 | } | |
601 | ||
602 | /* | |
050349bb | 603 | * Force flush buffer for channel. |
f3ed775e DG |
604 | */ |
605 | int kernel_flush_buffer(struct ltt_kernel_channel *channel) | |
606 | { | |
607 | int ret; | |
608 | struct ltt_kernel_stream *stream; | |
609 | ||
0525e9ae DG |
610 | assert(channel); |
611 | ||
f3ed775e DG |
612 | DBG("Flush buffer for channel %s", channel->channel->name); |
613 | ||
614 | cds_list_for_each_entry(stream, &channel->stream_list.head, list) { | |
615 | DBG("Flushing channel stream %d", stream->fd); | |
616 | ret = kernctl_buffer_flush(stream->fd); | |
617 | if (ret < 0) { | |
df0f840b | 618 | PERROR("ioctl"); |
f3ed775e DG |
619 | ERR("Fail to flush buffer for stream %d (ret: %d)", |
620 | stream->fd, ret); | |
621 | } | |
622 | } | |
623 | ||
624 | return 0; | |
625 | } | |
626 | ||
8c0faa1d | 627 | /* |
050349bb | 628 | * Stop tracing session. |
8c0faa1d DG |
629 | */ |
630 | int kernel_stop_session(struct ltt_kernel_session *session) | |
631 | { | |
632 | int ret; | |
633 | ||
0525e9ae DG |
634 | assert(session); |
635 | ||
8c0faa1d DG |
636 | ret = kernctl_stop_session(session->fd); |
637 | if (ret < 0) { | |
638 | goto error; | |
639 | } | |
640 | ||
641 | DBG("Kernel session stopped"); | |
642 | ||
643 | return 0; | |
644 | ||
645 | error: | |
646 | return ret; | |
647 | } | |
648 | ||
649 | /* | |
050349bb DG |
650 | * Open stream of channel, register it to the kernel tracer and add it |
651 | * to the stream list of the channel. | |
8c0faa1d | 652 | * |
820aa965 MD |
653 | * Note: given that the streams may appear in random order wrt CPU |
654 | * number (e.g. cpu hotplug), the index value of the stream number in | |
655 | * the stream name is not necessarily linked to the CPU number. | |
656 | * | |
050349bb | 657 | * Return the number of created stream. Else, a negative value. |
8c0faa1d | 658 | */ |
f3ed775e | 659 | int kernel_open_channel_stream(struct ltt_kernel_channel *channel) |
8c0faa1d | 660 | { |
820aa965 | 661 | int ret; |
8c0faa1d DG |
662 | struct ltt_kernel_stream *lks; |
663 | ||
0525e9ae DG |
664 | assert(channel); |
665 | ||
5a47c6a2 | 666 | while ((ret = kernctl_create_stream(channel->fd)) >= 0) { |
820aa965 MD |
667 | lks = trace_kernel_create_stream(channel->channel->name, |
668 | channel->stream_count); | |
8c0faa1d | 669 | if (lks == NULL) { |
799e2c4f MD |
670 | ret = close(ret); |
671 | if (ret) { | |
672 | PERROR("close"); | |
673 | } | |
8c0faa1d DG |
674 | goto error; |
675 | } | |
676 | ||
677 | lks->fd = ret; | |
7b395890 DG |
678 | /* Prevent fd duplication after execlp() */ |
679 | ret = fcntl(lks->fd, F_SETFD, FD_CLOEXEC); | |
680 | if (ret < 0) { | |
df0f840b | 681 | PERROR("fcntl session fd"); |
7b395890 DG |
682 | } |
683 | ||
1624d5b7 JD |
684 | lks->tracefile_size = channel->channel->attr.tracefile_size; |
685 | lks->tracefile_count = channel->channel->attr.tracefile_count; | |
686 | ||
820aa965 | 687 | /* Add stream to channel stream list */ |
8c0faa1d DG |
688 | cds_list_add(&lks->list, &channel->stream_list.head); |
689 | channel->stream_count++; | |
8c0faa1d | 690 | |
00e2e675 DG |
691 | DBG("Kernel stream %s created (fd: %d, state: %d)", lks->name, lks->fd, |
692 | lks->state); | |
54012638 | 693 | } |
8c0faa1d DG |
694 | |
695 | return channel->stream_count; | |
696 | ||
697 | error: | |
54012638 | 698 | return -1; |
8c0faa1d DG |
699 | } |
700 | ||
701 | /* | |
050349bb | 702 | * Open the metadata stream and set it to the kernel session. |
8c0faa1d | 703 | */ |
f3ed775e | 704 | int kernel_open_metadata_stream(struct ltt_kernel_session *session) |
8c0faa1d DG |
705 | { |
706 | int ret; | |
707 | ||
0525e9ae DG |
708 | assert(session); |
709 | ||
8c0faa1d DG |
710 | ret = kernctl_create_stream(session->metadata->fd); |
711 | if (ret < 0) { | |
df0f840b | 712 | PERROR("kernel create metadata stream"); |
8c0faa1d DG |
713 | goto error; |
714 | } | |
715 | ||
716 | DBG("Kernel metadata stream created (fd: %d)", ret); | |
717 | session->metadata_stream_fd = ret; | |
7b395890 DG |
718 | /* Prevent fd duplication after execlp() */ |
719 | ret = fcntl(session->metadata_stream_fd, F_SETFD, FD_CLOEXEC); | |
720 | if (ret < 0) { | |
df0f840b | 721 | PERROR("fcntl session fd"); |
7b395890 | 722 | } |
aaf26714 DG |
723 | |
724 | return 0; | |
725 | ||
726 | error: | |
54012638 | 727 | return -1; |
aaf26714 | 728 | } |
2ef84c95 DG |
729 | |
730 | /* | |
9f19cc17 | 731 | * Get the event list from the kernel tracer and return the number of elements. |
2ef84c95 | 732 | */ |
9f19cc17 | 733 | ssize_t kernel_list_events(int tracer_fd, struct lttng_event **events) |
2ef84c95 | 734 | { |
53efb85a | 735 | int fd, ret; |
9f19cc17 DG |
736 | char *event; |
737 | size_t nbmem, count = 0; | |
2ef84c95 | 738 | FILE *fp; |
9f19cc17 | 739 | struct lttng_event *elist; |
2ef84c95 | 740 | |
0525e9ae DG |
741 | assert(events); |
742 | ||
2ef84c95 DG |
743 | fd = kernctl_tracepoint_list(tracer_fd); |
744 | if (fd < 0) { | |
df0f840b | 745 | PERROR("kernel tracepoint list"); |
2ef84c95 DG |
746 | goto error; |
747 | } | |
748 | ||
749 | fp = fdopen(fd, "r"); | |
750 | if (fp == NULL) { | |
df0f840b | 751 | PERROR("kernel tracepoint list fdopen"); |
61b73b12 | 752 | goto error_fp; |
2ef84c95 DG |
753 | } |
754 | ||
755 | /* | |
756 | * Init memory size counter | |
757 | * See kernel-ctl.h for explanation of this value | |
758 | */ | |
6725fe19 | 759 | nbmem = KERNEL_EVENT_INIT_LIST_SIZE; |
ba7f0ae5 | 760 | elist = zmalloc(sizeof(struct lttng_event) * nbmem); |
3b870559 MD |
761 | if (elist == NULL) { |
762 | PERROR("alloc list events"); | |
763 | count = -ENOMEM; | |
764 | goto end; | |
765 | } | |
2ef84c95 | 766 | |
53efb85a | 767 | while (fscanf(fp, "event { name = %m[^;]; };\n", &event) == 1) { |
6725fe19 | 768 | if (count >= nbmem) { |
3b870559 | 769 | struct lttng_event *new_elist; |
53efb85a | 770 | size_t new_nbmem; |
3b870559 | 771 | |
53efb85a MD |
772 | new_nbmem = nbmem << 1; |
773 | DBG("Reallocating event list from %zu to %zu bytes", | |
774 | nbmem, new_nbmem); | |
775 | new_elist = realloc(elist, new_nbmem * sizeof(struct lttng_event)); | |
3b870559 | 776 | if (new_elist == NULL) { |
df0f840b | 777 | PERROR("realloc list events"); |
3b870559 MD |
778 | free(event); |
779 | free(elist); | |
61b73b12 MD |
780 | count = -ENOMEM; |
781 | goto end; | |
2ef84c95 | 782 | } |
53efb85a MD |
783 | /* Zero the new memory */ |
784 | memset(new_elist + nbmem, 0, | |
785 | (new_nbmem - nbmem) * sizeof(struct lttng_event)); | |
786 | nbmem = new_nbmem; | |
3b870559 | 787 | elist = new_elist; |
2ef84c95 | 788 | } |
99497cd0 MD |
789 | strncpy(elist[count].name, event, LTTNG_SYMBOL_NAME_LEN); |
790 | elist[count].name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0'; | |
67b9d018 | 791 | elist[count].enabled = -1; |
9f19cc17 | 792 | count++; |
3b870559 | 793 | free(event); |
2ef84c95 DG |
794 | } |
795 | ||
9f19cc17 | 796 | *events = elist; |
ced2f820 | 797 | DBG("Kernel list events done (%zu events)", count); |
61b73b12 | 798 | end: |
799e2c4f MD |
799 | ret = fclose(fp); /* closes both fp and fd */ |
800 | if (ret) { | |
801 | PERROR("fclose"); | |
802 | } | |
9f19cc17 | 803 | return count; |
2ef84c95 | 804 | |
61b73b12 | 805 | error_fp: |
799e2c4f MD |
806 | ret = close(fd); |
807 | if (ret) { | |
808 | PERROR("close"); | |
809 | } | |
2ef84c95 DG |
810 | error: |
811 | return -1; | |
812 | } | |
096102bd DG |
813 | |
814 | /* | |
815 | * Get kernel version and validate it. | |
816 | */ | |
817 | int kernel_validate_version(int tracer_fd) | |
818 | { | |
819 | int ret; | |
820 | struct lttng_kernel_tracer_version version; | |
c052142c | 821 | struct lttng_kernel_tracer_abi_version abi_version; |
096102bd DG |
822 | |
823 | ret = kernctl_tracer_version(tracer_fd, &version); | |
824 | if (ret < 0) { | |
521dd134 | 825 | ERR("Failed to retrieve the lttng-modules version"); |
096102bd DG |
826 | goto error; |
827 | } | |
828 | ||
829 | /* Validate version */ | |
c052142c MD |
830 | if (version.major != VERSION_MAJOR) { |
831 | ERR("Kernel tracer major version (%d) is not compatible with lttng-tools major version (%d)", | |
832 | version.major, VERSION_MAJOR); | |
096102bd | 833 | goto error_version; |
096102bd | 834 | } |
c052142c MD |
835 | ret = kernctl_tracer_abi_version(tracer_fd, &abi_version); |
836 | if (ret < 0) { | |
521dd134 | 837 | ERR("Failed to retrieve lttng-modules ABI version"); |
c052142c MD |
838 | goto error; |
839 | } | |
840 | if (abi_version.major != LTTNG_MODULES_ABI_MAJOR_VERSION) { | |
521dd134 | 841 | ERR("Kernel tracer ABI version (%d.%d) does not match the expected ABI major version (%d.*)", |
c052142c MD |
842 | abi_version.major, abi_version.minor, |
843 | LTTNG_MODULES_ABI_MAJOR_VERSION); | |
844 | goto error; | |
845 | } | |
846 | DBG2("Kernel tracer version validated (%d.%d, ABI %d.%d)", | |
847 | version.major, version.minor, | |
848 | abi_version.major, abi_version.minor); | |
096102bd DG |
849 | return 0; |
850 | ||
851 | error_version: | |
096102bd DG |
852 | ret = -1; |
853 | ||
854 | error: | |
521dd134 | 855 | ERR("Kernel tracer version check failed; kernel tracing will not be available"); |
096102bd DG |
856 | return ret; |
857 | } | |
335a95b7 MD |
858 | |
859 | /* | |
860 | * Kernel work-arounds called at the start of sessiond main(). | |
861 | */ | |
862 | int init_kernel_workarounds(void) | |
863 | { | |
8936c33a | 864 | int ret; |
335a95b7 MD |
865 | FILE *fp; |
866 | ||
867 | /* | |
868 | * boot_id needs to be read once before being used concurrently | |
869 | * to deal with a Linux kernel race. A fix is proposed for | |
870 | * upstream, but the work-around is needed for older kernels. | |
871 | */ | |
872 | fp = fopen("/proc/sys/kernel/random/boot_id", "r"); | |
873 | if (!fp) { | |
874 | goto end_boot_id; | |
875 | } | |
876 | while (!feof(fp)) { | |
877 | char buf[37] = ""; | |
878 | ||
8936c33a DG |
879 | ret = fread(buf, 1, sizeof(buf), fp); |
880 | if (ret < 0) { | |
881 | /* Ignore error, we don't really care */ | |
882 | } | |
335a95b7 | 883 | } |
799e2c4f MD |
884 | ret = fclose(fp); |
885 | if (ret) { | |
886 | PERROR("fclose"); | |
887 | } | |
335a95b7 | 888 | end_boot_id: |
335a95b7 MD |
889 | return 0; |
890 | } | |
2f77fc4b DG |
891 | |
892 | /* | |
893 | * Complete teardown of a kernel session. | |
894 | */ | |
895 | void kernel_destroy_session(struct ltt_kernel_session *ksess) | |
896 | { | |
897 | if (ksess == NULL) { | |
898 | DBG3("No kernel session when tearing down session"); | |
899 | return; | |
900 | } | |
901 | ||
902 | DBG("Tearing down kernel session"); | |
903 | ||
07b86b52 | 904 | /* |
15dc512a DG |
905 | * Destroy channels on the consumer if at least one FD has been sent and we |
906 | * are in no output mode because the streams are in *no* monitor mode so we | |
907 | * have to send a command to clean them up or else they leaked. | |
07b86b52 | 908 | */ |
15dc512a | 909 | if (!ksess->output_traces && ksess->consumer_fds_sent) { |
07b86b52 JD |
910 | int ret; |
911 | struct consumer_socket *socket; | |
912 | struct lttng_ht_iter iter; | |
913 | ||
914 | /* For each consumer socket. */ | |
d069d577 | 915 | rcu_read_lock(); |
07b86b52 JD |
916 | cds_lfht_for_each_entry(ksess->consumer->socks->ht, &iter.iter, |
917 | socket, node.node) { | |
918 | struct ltt_kernel_channel *chan; | |
919 | ||
920 | /* For each channel, ask the consumer to destroy it. */ | |
921 | cds_list_for_each_entry(chan, &ksess->channel_list.head, list) { | |
922 | ret = kernel_consumer_destroy_channel(socket, chan); | |
923 | if (ret < 0) { | |
924 | /* Consumer is probably dead. Use next socket. */ | |
925 | continue; | |
926 | } | |
927 | } | |
928 | } | |
d069d577 | 929 | rcu_read_unlock(); |
07b86b52 JD |
930 | } |
931 | ||
2f77fc4b DG |
932 | /* Close any relayd session */ |
933 | consumer_output_send_destroy_relayd(ksess->consumer); | |
934 | ||
935 | trace_kernel_destroy_session(ksess); | |
936 | } | |
fb5f35b6 DG |
937 | |
938 | /* | |
939 | * Destroy a kernel channel object. It does not do anything on the tracer side. | |
940 | */ | |
941 | void kernel_destroy_channel(struct ltt_kernel_channel *kchan) | |
942 | { | |
943 | struct ltt_kernel_session *ksess = NULL; | |
944 | ||
945 | assert(kchan); | |
946 | assert(kchan->channel); | |
947 | ||
948 | DBG3("Kernel destroy channel %s", kchan->channel->name); | |
949 | ||
950 | /* Update channel count of associated session. */ | |
951 | if (kchan->session) { | |
952 | /* Keep pointer reference so we can update it after the destroy. */ | |
953 | ksess = kchan->session; | |
954 | } | |
955 | ||
956 | trace_kernel_destroy_channel(kchan); | |
957 | ||
958 | /* | |
959 | * At this point the kernel channel is not visible anymore. This is safe | |
960 | * since in order to work on a visible kernel session, the tracing session | |
961 | * lock (ltt_session.lock) MUST be acquired. | |
962 | */ | |
963 | if (ksess) { | |
964 | ksess->channel_count--; | |
965 | } | |
966 | } | |
6dc3064a DG |
967 | |
968 | /* | |
969 | * Take a snapshot for a given kernel session. | |
970 | * | |
2a06df8d | 971 | * Return 0 on success or else return a LTTNG_ERR code. |
6dc3064a DG |
972 | */ |
973 | int kernel_snapshot_record(struct ltt_kernel_session *ksess, | |
d07ceecd MD |
974 | struct snapshot_output *output, int wait, |
975 | uint64_t nb_packets_per_stream) | |
6dc3064a | 976 | { |
2a06df8d | 977 | int err, ret, saved_metadata_fd; |
6dc3064a DG |
978 | struct consumer_socket *socket; |
979 | struct lttng_ht_iter iter; | |
980 | struct ltt_kernel_metadata *saved_metadata; | |
981 | ||
982 | assert(ksess); | |
983 | assert(ksess->consumer); | |
984 | assert(output); | |
985 | ||
986 | DBG("Kernel snapshot record started"); | |
987 | ||
988 | /* Save current metadata since the following calls will change it. */ | |
989 | saved_metadata = ksess->metadata; | |
990 | saved_metadata_fd = ksess->metadata_stream_fd; | |
991 | ||
992 | rcu_read_lock(); | |
993 | ||
994 | ret = kernel_open_metadata(ksess); | |
995 | if (ret < 0) { | |
996 | ret = LTTNG_ERR_KERN_META_FAIL; | |
997 | goto error; | |
998 | } | |
999 | ||
1000 | ret = kernel_open_metadata_stream(ksess); | |
1001 | if (ret < 0) { | |
1002 | ret = LTTNG_ERR_KERN_META_FAIL; | |
1003 | goto error_open_stream; | |
1004 | } | |
1005 | ||
1006 | /* Send metadata to consumer and snapshot everything. */ | |
1007 | cds_lfht_for_each_entry(ksess->consumer->socks->ht, &iter.iter, | |
1008 | socket, node.node) { | |
1009 | struct consumer_output *saved_output; | |
1010 | struct ltt_kernel_channel *chan; | |
6dc3064a DG |
1011 | |
1012 | /* | |
1013 | * Temporarly switch consumer output for our snapshot output. As long | |
1014 | * as the session lock is taken, this is safe. | |
1015 | */ | |
1016 | saved_output = ksess->consumer; | |
1017 | ksess->consumer = output->consumer; | |
1018 | ||
1019 | pthread_mutex_lock(socket->lock); | |
1020 | /* This stream must not be monitored by the consumer. */ | |
07b86b52 | 1021 | ret = kernel_consumer_add_metadata(socket, ksess, 0); |
6dc3064a | 1022 | pthread_mutex_unlock(socket->lock); |
07b86b52 | 1023 | /* Put back the saved consumer output into the session. */ |
6dc3064a DG |
1024 | ksess->consumer = saved_output; |
1025 | if (ret < 0) { | |
1026 | ret = LTTNG_ERR_KERN_CONSUMER_FAIL; | |
1027 | goto error_consumer; | |
1028 | } | |
1029 | ||
1030 | /* For each channel, ask the consumer to snapshot it. */ | |
1031 | cds_list_for_each_entry(chan, &ksess->channel_list.head, list) { | |
1032 | ret = consumer_snapshot_channel(socket, chan->fd, output, 0, | |
5c786ded JD |
1033 | ksess->uid, ksess->gid, |
1034 | DEFAULT_KERNEL_TRACE_DIR, wait, | |
d07ceecd | 1035 | nb_packets_per_stream); |
6dc3064a DG |
1036 | if (ret < 0) { |
1037 | ret = LTTNG_ERR_KERN_CONSUMER_FAIL; | |
2a06df8d DG |
1038 | (void) kernel_consumer_destroy_metadata(socket, |
1039 | ksess->metadata); | |
6dc3064a DG |
1040 | goto error_consumer; |
1041 | } | |
1042 | } | |
1043 | ||
1044 | /* Snapshot metadata, */ | |
1045 | ret = consumer_snapshot_channel(socket, ksess->metadata->fd, output, | |
5c786ded | 1046 | 1, ksess->uid, ksess->gid, |
d07ceecd | 1047 | DEFAULT_KERNEL_TRACE_DIR, wait, 0); |
6dc3064a DG |
1048 | if (ret < 0) { |
1049 | ret = LTTNG_ERR_KERN_CONSUMER_FAIL; | |
1050 | goto error_consumer; | |
1051 | } | |
07b86b52 JD |
1052 | |
1053 | /* | |
1054 | * The metadata snapshot is done, ask the consumer to destroy it since | |
1055 | * it's not monitored on the consumer side. | |
1056 | */ | |
1057 | (void) kernel_consumer_destroy_metadata(socket, ksess->metadata); | |
6dc3064a DG |
1058 | } |
1059 | ||
fac41e72 DG |
1060 | ret = LTTNG_OK; |
1061 | ||
6dc3064a DG |
1062 | error_consumer: |
1063 | /* Close newly opened metadata stream. It's now on the consumer side. */ | |
2a06df8d DG |
1064 | err = close(ksess->metadata_stream_fd); |
1065 | if (err < 0) { | |
6dc3064a DG |
1066 | PERROR("close snapshot kernel"); |
1067 | } | |
1068 | ||
1069 | error_open_stream: | |
1070 | trace_kernel_destroy_metadata(ksess->metadata); | |
1071 | error: | |
1072 | /* Restore metadata state.*/ | |
1073 | ksess->metadata = saved_metadata; | |
1074 | ksess->metadata_stream_fd = saved_metadata_fd; | |
1075 | ||
1076 | rcu_read_unlock(); | |
1077 | return ret; | |
1078 | } | |
834978fd DG |
1079 | |
1080 | /* | |
1081 | * Get the syscall mask array from the kernel tracer. | |
1082 | * | |
1083 | * Return 0 on success else a negative value. In both case, syscall_mask should | |
1084 | * be freed. | |
1085 | */ | |
1086 | int kernel_syscall_mask(int chan_fd, char **syscall_mask, uint32_t *nr_bits) | |
1087 | { | |
1088 | assert(syscall_mask); | |
1089 | assert(nr_bits); | |
1090 | ||
1091 | return kernctl_syscall_mask(chan_fd, syscall_mask, nr_bits); | |
1092 | } | |
883d8478 JR |
1093 | |
1094 | /* | |
1095 | * Check for the support of the RING_BUFFER_SNAPSHOT_SAMPLE_POSITIONS via abi | |
1096 | * version number. | |
1097 | * | |
1098 | * Return 1 on success, 0 when feature is not supported, negative value in case | |
1099 | * of errors. | |
1100 | */ | |
1101 | int kernel_supports_ring_buffer_snapshot_sample_positions(int tracer_fd) | |
1102 | { | |
1103 | int ret = 0; // Not supported by default | |
1104 | struct lttng_kernel_tracer_abi_version abi; | |
1105 | ||
1106 | ret = kernctl_tracer_abi_version(tracer_fd, &abi); | |
1107 | if (ret < 0) { | |
1108 | ERR("Failed to retrieve lttng-modules ABI version"); | |
1109 | goto error; | |
1110 | } | |
1111 | ||
1112 | /* | |
1113 | * RING_BUFFER_SNAPSHOT_SAMPLE_POSITIONS was introduced in 2.3 | |
1114 | */ | |
1115 | if (abi.major >= 2 && abi.minor >= 3) { | |
1116 | /* Supported */ | |
1117 | ret = 1; | |
1118 | } else { | |
1119 | /* Not supported */ | |
1120 | ret = 0; | |
1121 | } | |
1122 | error: | |
1123 | return ret; | |
1124 | } |