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. |
da23da06 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 DG |
67 | } |
68 | ||
1ae5e83e | 69 | end: |
645328ae | 70 | cds_list_add_tail(&ctx->list, &chan->ctx_list); |
9b09ad37 | 71 | ctx->in_list = true; |
da23da06 | 72 | ctx = NULL; |
d65106b1 | 73 | error: |
da23da06 JG |
74 | if (ctx) { |
75 | trace_kernel_destroy_context(ctx); | |
76 | } | |
d65106b1 DG |
77 | return ret; |
78 | } | |
79 | ||
20fe2104 | 80 | /* |
050349bb DG |
81 | * Create a new kernel session, register it to the kernel tracer and add it to |
82 | * the session daemon session. | |
20fe2104 | 83 | */ |
8c0faa1d | 84 | int kernel_create_session(struct ltt_session *session, int tracer_fd) |
20fe2104 DG |
85 | { |
86 | int ret; | |
87 | struct ltt_kernel_session *lks; | |
88 | ||
0525e9ae DG |
89 | assert(session); |
90 | ||
54012638 | 91 | /* Allocate data structure */ |
dec56f6c | 92 | lks = trace_kernel_create_session(); |
20fe2104 | 93 | if (lks == NULL) { |
54012638 | 94 | ret = -1; |
20fe2104 DG |
95 | goto error; |
96 | } | |
97 | ||
54012638 | 98 | /* Kernel tracer session creation */ |
20fe2104 DG |
99 | ret = kernctl_create_session(tracer_fd); |
100 | if (ret < 0) { | |
df0f840b | 101 | PERROR("ioctl kernel create session"); |
20fe2104 DG |
102 | goto error; |
103 | } | |
104 | ||
20fe2104 | 105 | lks->fd = ret; |
7b395890 DG |
106 | /* Prevent fd duplication after execlp() */ |
107 | ret = fcntl(lks->fd, F_SETFD, FD_CLOEXEC); | |
108 | if (ret < 0) { | |
df0f840b | 109 | PERROR("fcntl session fd"); |
7b395890 DG |
110 | } |
111 | ||
53632229 | 112 | lks->id = session->id; |
3bd1e081 | 113 | lks->consumer_fds_sent = 0; |
8c0faa1d | 114 | session->kernel_session = lks; |
8c0faa1d DG |
115 | |
116 | DBG("Kernel session created (fd: %d)", lks->fd); | |
20fe2104 DG |
117 | |
118 | return 0; | |
119 | ||
120 | error: | |
5f62c685 DG |
121 | if (lks) { |
122 | trace_kernel_destroy_session(lks); | |
123 | } | |
20fe2104 DG |
124 | return ret; |
125 | } | |
126 | ||
127 | /* | |
050349bb DG |
128 | * Create a kernel channel, register it to the kernel tracer and add it to the |
129 | * kernel session. | |
20fe2104 | 130 | */ |
050349bb | 131 | int kernel_create_channel(struct ltt_kernel_session *session, |
fdd9eb17 | 132 | struct lttng_channel *chan) |
20fe2104 DG |
133 | { |
134 | int ret; | |
135 | struct ltt_kernel_channel *lkc; | |
20fe2104 | 136 | |
0525e9ae DG |
137 | assert(session); |
138 | assert(chan); | |
0525e9ae | 139 | |
54012638 | 140 | /* Allocate kernel channel */ |
fdd9eb17 | 141 | lkc = trace_kernel_create_channel(chan); |
54012638 | 142 | if (lkc == NULL) { |
20fe2104 DG |
143 | goto error; |
144 | } | |
145 | ||
ecc48a90 | 146 | DBG3("Kernel create channel %s with attr: %d, %" PRIu64 ", %" PRIu64 ", %u, %u, %d, %d", |
fdd9eb17 | 147 | chan->name, lkc->channel->attr.overwrite, |
173af62f DG |
148 | lkc->channel->attr.subbuf_size, lkc->channel->attr.num_subbuf, |
149 | lkc->channel->attr.switch_timer_interval, lkc->channel->attr.read_timer_interval, | |
ecc48a90 | 150 | lkc->channel->attr.live_timer_interval, lkc->channel->attr.output); |
173af62f | 151 | |
54012638 | 152 | /* Kernel tracer channel creation */ |
f3ed775e | 153 | ret = kernctl_create_channel(session->fd, &lkc->channel->attr); |
20fe2104 | 154 | if (ret < 0) { |
df0f840b | 155 | PERROR("ioctl kernel create channel"); |
20fe2104 DG |
156 | goto error; |
157 | } | |
158 | ||
54012638 | 159 | /* Setup the channel fd */ |
20fe2104 | 160 | lkc->fd = ret; |
7b395890 DG |
161 | /* Prevent fd duplication after execlp() */ |
162 | ret = fcntl(lkc->fd, F_SETFD, FD_CLOEXEC); | |
163 | if (ret < 0) { | |
df0f840b | 164 | PERROR("fcntl session fd"); |
7b395890 DG |
165 | } |
166 | ||
54012638 | 167 | /* Add channel to session */ |
8c0faa1d DG |
168 | cds_list_add(&lkc->list, &session->channel_list.head); |
169 | session->channel_count++; | |
fb5f35b6 | 170 | lkc->session = session; |
20fe2104 | 171 | |
00e2e675 | 172 | DBG("Kernel channel %s created (fd: %d)", lkc->channel->name, lkc->fd); |
20fe2104 DG |
173 | |
174 | return 0; | |
175 | ||
176 | error: | |
5f62c685 DG |
177 | if (lkc) { |
178 | free(lkc->channel); | |
179 | free(lkc); | |
180 | } | |
54012638 | 181 | return -1; |
20fe2104 | 182 | } |
f34daff7 DG |
183 | |
184 | /* | |
050349bb DG |
185 | * Create a kernel event, enable it to the kernel tracer and add it to the |
186 | * channel event list of the kernel session. | |
49d21f93 | 187 | * We own filter_expression and filter. |
f34daff7 | 188 | */ |
050349bb | 189 | int kernel_create_event(struct lttng_event *ev, |
00a62084 MD |
190 | struct ltt_kernel_channel *channel, |
191 | char *filter_expression, | |
192 | struct lttng_filter_bytecode *filter) | |
f34daff7 DG |
193 | { |
194 | int ret; | |
195 | struct ltt_kernel_event *event; | |
f34daff7 | 196 | |
0525e9ae DG |
197 | assert(ev); |
198 | assert(channel); | |
199 | ||
a969e101 | 200 | /* We pass ownership of filter_expression and filter */ |
00a62084 MD |
201 | event = trace_kernel_create_event(ev, filter_expression, |
202 | filter); | |
54012638 | 203 | if (event == NULL) { |
d87bfb32 | 204 | ret = -1; |
f34daff7 DG |
205 | goto error; |
206 | } | |
207 | ||
f3ed775e DG |
208 | ret = kernctl_create_event(channel->fd, event->event); |
209 | if (ret < 0) { | |
32af2c95 | 210 | switch (-ret) { |
bd29c13d DG |
211 | case EEXIST: |
212 | break; | |
213 | case ENOSYS: | |
214 | WARN("Event type not implemented"); | |
215 | break; | |
8197a339 DG |
216 | case ENOENT: |
217 | WARN("Event %s not found!", ev->name); | |
218 | break; | |
bd29c13d | 219 | default: |
d87bfb32 DG |
220 | PERROR("create event ioctl"); |
221 | } | |
e953ef25 | 222 | goto free_event; |
8c0faa1d | 223 | } |
f34daff7 | 224 | |
d0ae4ea8 | 225 | event->type = ev->type; |
f3ed775e | 226 | event->fd = ret; |
7b395890 DG |
227 | /* Prevent fd duplication after execlp() */ |
228 | ret = fcntl(event->fd, F_SETFD, FD_CLOEXEC); | |
229 | if (ret < 0) { | |
df0f840b | 230 | PERROR("fcntl session fd"); |
7b395890 DG |
231 | } |
232 | ||
00a62084 MD |
233 | if (filter) { |
234 | ret = kernctl_filter(event->fd, filter); | |
235 | if (ret) { | |
236 | goto filter_error; | |
237 | } | |
238 | } | |
239 | ||
240 | ret = kernctl_enable(event->fd); | |
241 | if (ret < 0) { | |
32af2c95 | 242 | switch (-ret) { |
00a62084 MD |
243 | case EEXIST: |
244 | ret = LTTNG_ERR_KERN_EVENT_EXIST; | |
245 | break; | |
246 | default: | |
247 | PERROR("enable kernel event"); | |
248 | break; | |
249 | } | |
250 | goto enable_error; | |
251 | } | |
252 | ||
f3ed775e DG |
253 | /* Add event to event list */ |
254 | cds_list_add(&event->list, &channel->events_list.head); | |
cbbbb275 DG |
255 | channel->event_count++; |
256 | ||
e953ef25 DG |
257 | DBG("Event %s created (fd: %d)", ev->name, event->fd); |
258 | ||
259 | return 0; | |
260 | ||
00a62084 MD |
261 | enable_error: |
262 | filter_error: | |
263 | { | |
264 | int closeret; | |
265 | ||
266 | closeret = close(event->fd); | |
267 | if (closeret) { | |
268 | PERROR("close event fd"); | |
269 | } | |
270 | } | |
e953ef25 DG |
271 | free_event: |
272 | free(event); | |
273 | error: | |
d87bfb32 | 274 | return ret; |
e953ef25 DG |
275 | } |
276 | ||
26cc6b4e | 277 | /* |
050349bb | 278 | * Disable a kernel channel. |
26cc6b4e DG |
279 | */ |
280 | int kernel_disable_channel(struct ltt_kernel_channel *chan) | |
281 | { | |
282 | int ret; | |
283 | ||
0525e9ae DG |
284 | assert(chan); |
285 | ||
26cc6b4e DG |
286 | ret = kernctl_disable(chan->fd); |
287 | if (ret < 0) { | |
df0f840b | 288 | PERROR("disable chan ioctl"); |
26cc6b4e DG |
289 | goto error; |
290 | } | |
291 | ||
292 | chan->enabled = 0; | |
293 | DBG("Kernel channel %s disabled (fd: %d)", chan->channel->name, chan->fd); | |
294 | ||
295 | return 0; | |
296 | ||
297 | error: | |
298 | return ret; | |
299 | } | |
300 | ||
d36b8583 | 301 | /* |
050349bb | 302 | * Enable a kernel channel. |
d36b8583 DG |
303 | */ |
304 | int kernel_enable_channel(struct ltt_kernel_channel *chan) | |
305 | { | |
306 | int ret; | |
307 | ||
0525e9ae DG |
308 | assert(chan); |
309 | ||
d36b8583 | 310 | ret = kernctl_enable(chan->fd); |
32af2c95 | 311 | if (ret < 0 && ret != -EEXIST) { |
df0f840b | 312 | PERROR("Enable kernel chan"); |
d36b8583 DG |
313 | goto error; |
314 | } | |
315 | ||
316 | chan->enabled = 1; | |
317 | DBG("Kernel channel %s enabled (fd: %d)", chan->channel->name, chan->fd); | |
318 | ||
319 | return 0; | |
320 | ||
321 | error: | |
322 | return ret; | |
323 | } | |
324 | ||
19e70852 | 325 | /* |
050349bb | 326 | * Enable a kernel event. |
19e70852 DG |
327 | */ |
328 | int kernel_enable_event(struct ltt_kernel_event *event) | |
329 | { | |
330 | int ret; | |
331 | ||
0525e9ae DG |
332 | assert(event); |
333 | ||
19e70852 | 334 | ret = kernctl_enable(event->fd); |
42224349 | 335 | if (ret < 0) { |
32af2c95 | 336 | switch (-ret) { |
42224349 | 337 | case EEXIST: |
f73fabfd | 338 | ret = LTTNG_ERR_KERN_EVENT_EXIST; |
42224349 DG |
339 | break; |
340 | default: | |
341 | PERROR("enable kernel event"); | |
342 | break; | |
343 | } | |
19e70852 DG |
344 | goto error; |
345 | } | |
346 | ||
347 | event->enabled = 1; | |
348 | DBG("Kernel event %s enabled (fd: %d)", event->event->name, event->fd); | |
349 | ||
350 | return 0; | |
351 | ||
352 | error: | |
d36b8583 | 353 | return ret; |
19e70852 DG |
354 | } |
355 | ||
e953ef25 | 356 | /* |
050349bb | 357 | * Disable a kernel event. |
e953ef25 | 358 | */ |
19e70852 | 359 | int kernel_disable_event(struct ltt_kernel_event *event) |
e953ef25 DG |
360 | { |
361 | int ret; | |
19e70852 | 362 | |
0525e9ae DG |
363 | assert(event); |
364 | ||
19e70852 | 365 | ret = kernctl_disable(event->fd); |
42224349 | 366 | if (ret < 0) { |
32af2c95 | 367 | switch (-ret) { |
42224349 | 368 | case EEXIST: |
f73fabfd | 369 | ret = LTTNG_ERR_KERN_EVENT_EXIST; |
42224349 DG |
370 | break; |
371 | default: | |
372 | PERROR("disable kernel event"); | |
373 | break; | |
374 | } | |
19e70852 | 375 | goto error; |
e953ef25 | 376 | } |
f3ed775e | 377 | |
19e70852 DG |
378 | event->enabled = 0; |
379 | DBG("Kernel event %s disabled (fd: %d)", event->event->name, event->fd); | |
380 | ||
f34daff7 DG |
381 | return 0; |
382 | ||
383 | error: | |
d36b8583 | 384 | return ret; |
f34daff7 | 385 | } |
aaf26714 | 386 | |
6e911cad | 387 | |
ccf10263 MD |
388 | int kernel_track_pid(struct ltt_kernel_session *session, int pid) |
389 | { | |
7c493d31 MD |
390 | int ret; |
391 | ||
ccf10263 MD |
392 | DBG("Kernel track PID %d for session id %" PRIu64 ".", |
393 | pid, session->id); | |
7c493d31 MD |
394 | ret = kernctl_track_pid(session->fd, pid); |
395 | if (!ret) { | |
396 | return LTTNG_OK; | |
397 | } | |
32af2c95 | 398 | switch (-ret) { |
7c493d31 MD |
399 | case EINVAL: |
400 | return LTTNG_ERR_INVALID; | |
401 | case ENOMEM: | |
402 | return LTTNG_ERR_NOMEM; | |
403 | case EEXIST: | |
404 | return LTTNG_ERR_PID_TRACKED; | |
405 | default: | |
406 | return LTTNG_ERR_UNK; | |
407 | } | |
ccf10263 MD |
408 | } |
409 | ||
410 | int kernel_untrack_pid(struct ltt_kernel_session *session, int pid) | |
411 | { | |
7c493d31 MD |
412 | int ret; |
413 | ||
ccf10263 MD |
414 | DBG("Kernel untrack PID %d for session id %" PRIu64 ".", |
415 | pid, session->id); | |
7c493d31 MD |
416 | ret = kernctl_untrack_pid(session->fd, pid); |
417 | if (!ret) { | |
418 | return LTTNG_OK; | |
419 | } | |
32af2c95 | 420 | switch (-ret) { |
7c493d31 MD |
421 | case EINVAL: |
422 | return LTTNG_ERR_INVALID; | |
423 | case ENOMEM: | |
424 | return LTTNG_ERR_NOMEM; | |
425 | case ENOENT: | |
426 | return LTTNG_ERR_PID_NOT_TRACKED; | |
427 | default: | |
428 | return LTTNG_ERR_UNK; | |
429 | } | |
ccf10263 MD |
430 | } |
431 | ||
a5dfbb9d MD |
432 | ssize_t kernel_list_tracker_pids(struct ltt_kernel_session *session, |
433 | int **_pids) | |
434 | { | |
435 | int fd, ret; | |
436 | int pid; | |
437 | ssize_t nbmem, count = 0; | |
438 | FILE *fp; | |
439 | int *pids; | |
440 | ||
441 | fd = kernctl_list_tracker_pids(session->fd); | |
442 | if (fd < 0) { | |
443 | PERROR("kernel tracker pids list"); | |
444 | goto error; | |
445 | } | |
446 | ||
447 | fp = fdopen(fd, "r"); | |
448 | if (fp == NULL) { | |
449 | PERROR("kernel tracker pids list fdopen"); | |
450 | goto error_fp; | |
451 | } | |
452 | ||
453 | nbmem = KERNEL_TRACKER_PIDS_INIT_LIST_SIZE; | |
454 | pids = zmalloc(sizeof(*pids) * nbmem); | |
455 | if (pids == NULL) { | |
456 | PERROR("alloc list pids"); | |
457 | count = -ENOMEM; | |
458 | goto end; | |
459 | } | |
460 | ||
461 | while (fscanf(fp, "process { pid = %u; };\n", &pid) == 1) { | |
462 | if (count >= nbmem) { | |
463 | int *new_pids; | |
464 | size_t new_nbmem; | |
465 | ||
466 | new_nbmem = nbmem << 1; | |
467 | DBG("Reallocating pids list from %zu to %zu entries", | |
468 | nbmem, new_nbmem); | |
469 | new_pids = realloc(pids, new_nbmem * sizeof(*new_pids)); | |
470 | if (new_pids == NULL) { | |
471 | PERROR("realloc list events"); | |
472 | free(pids); | |
473 | count = -ENOMEM; | |
474 | goto end; | |
475 | } | |
476 | /* Zero the new memory */ | |
477 | memset(new_pids + nbmem, 0, | |
478 | (new_nbmem - nbmem) * sizeof(*new_pids)); | |
479 | nbmem = new_nbmem; | |
480 | pids = new_pids; | |
481 | } | |
482 | pids[count++] = pid; | |
483 | } | |
484 | ||
485 | *_pids = pids; | |
486 | DBG("Kernel list tracker pids done (%zd pids)", count); | |
487 | end: | |
488 | ret = fclose(fp); /* closes both fp and fd */ | |
489 | if (ret) { | |
490 | PERROR("fclose"); | |
491 | } | |
492 | return count; | |
493 | ||
494 | error_fp: | |
495 | ret = close(fd); | |
496 | if (ret) { | |
497 | PERROR("close"); | |
498 | } | |
499 | error: | |
500 | return -1; | |
501 | } | |
502 | ||
aaf26714 | 503 | /* |
050349bb DG |
504 | * Create kernel metadata, open from the kernel tracer and add it to the |
505 | * kernel session. | |
aaf26714 | 506 | */ |
a4b92340 | 507 | int kernel_open_metadata(struct ltt_kernel_session *session) |
aaf26714 DG |
508 | { |
509 | int ret; | |
74024a21 | 510 | struct ltt_kernel_metadata *lkm = NULL; |
aaf26714 | 511 | |
0525e9ae DG |
512 | assert(session); |
513 | ||
54012638 | 514 | /* Allocate kernel metadata */ |
a4b92340 | 515 | lkm = trace_kernel_create_metadata(); |
54012638 | 516 | if (lkm == NULL) { |
aaf26714 DG |
517 | goto error; |
518 | } | |
519 | ||
54012638 | 520 | /* Kernel tracer metadata creation */ |
f3ed775e | 521 | ret = kernctl_open_metadata(session->fd, &lkm->conf->attr); |
aaf26714 | 522 | if (ret < 0) { |
74024a21 | 523 | goto error_open; |
aaf26714 DG |
524 | } |
525 | ||
8c0faa1d | 526 | lkm->fd = ret; |
7b395890 DG |
527 | /* Prevent fd duplication after execlp() */ |
528 | ret = fcntl(lkm->fd, F_SETFD, FD_CLOEXEC); | |
529 | if (ret < 0) { | |
df0f840b | 530 | PERROR("fcntl session fd"); |
7b395890 DG |
531 | } |
532 | ||
aaf26714 | 533 | session->metadata = lkm; |
8c0faa1d | 534 | |
00e2e675 | 535 | DBG("Kernel metadata opened (fd: %d)", lkm->fd); |
8c0faa1d DG |
536 | |
537 | return 0; | |
538 | ||
74024a21 DG |
539 | error_open: |
540 | trace_kernel_destroy_metadata(lkm); | |
8c0faa1d | 541 | error: |
54012638 | 542 | return -1; |
8c0faa1d DG |
543 | } |
544 | ||
545 | /* | |
050349bb | 546 | * Start tracing session. |
8c0faa1d DG |
547 | */ |
548 | int kernel_start_session(struct ltt_kernel_session *session) | |
549 | { | |
550 | int ret; | |
551 | ||
0525e9ae DG |
552 | assert(session); |
553 | ||
8c0faa1d DG |
554 | ret = kernctl_start_session(session->fd); |
555 | if (ret < 0) { | |
df0f840b | 556 | PERROR("ioctl start session"); |
8c0faa1d DG |
557 | goto error; |
558 | } | |
559 | ||
560 | DBG("Kernel session started"); | |
561 | ||
562 | return 0; | |
563 | ||
564 | error: | |
565 | return ret; | |
566 | } | |
567 | ||
f3ed775e | 568 | /* |
050349bb | 569 | * Make a kernel wait to make sure in-flight probe have completed. |
f3ed775e DG |
570 | */ |
571 | void kernel_wait_quiescent(int fd) | |
572 | { | |
573 | int ret; | |
574 | ||
575 | DBG("Kernel quiescent wait on %d", fd); | |
576 | ||
577 | ret = kernctl_wait_quiescent(fd); | |
578 | if (ret < 0) { | |
df0f840b | 579 | PERROR("wait quiescent ioctl"); |
f3ed775e DG |
580 | ERR("Kernel quiescent wait failed"); |
581 | } | |
582 | } | |
583 | ||
584 | /* | |
f3ed775e DG |
585 | * Force flush buffer of metadata. |
586 | */ | |
587 | int kernel_metadata_flush_buffer(int fd) | |
588 | { | |
589 | int ret; | |
590 | ||
169d2cb7 DG |
591 | DBG("Kernel flushing metadata buffer on fd %d", fd); |
592 | ||
f3ed775e DG |
593 | ret = kernctl_buffer_flush(fd); |
594 | if (ret < 0) { | |
00e2e675 | 595 | ERR("Fail to flush metadata buffers %d (ret: %d)", fd, ret); |
f3ed775e DG |
596 | } |
597 | ||
598 | return 0; | |
599 | } | |
600 | ||
601 | /* | |
050349bb | 602 | * Force flush buffer for channel. |
f3ed775e DG |
603 | */ |
604 | int kernel_flush_buffer(struct ltt_kernel_channel *channel) | |
605 | { | |
606 | int ret; | |
607 | struct ltt_kernel_stream *stream; | |
608 | ||
0525e9ae DG |
609 | assert(channel); |
610 | ||
f3ed775e DG |
611 | DBG("Flush buffer for channel %s", channel->channel->name); |
612 | ||
613 | cds_list_for_each_entry(stream, &channel->stream_list.head, list) { | |
614 | DBG("Flushing channel stream %d", stream->fd); | |
615 | ret = kernctl_buffer_flush(stream->fd); | |
616 | if (ret < 0) { | |
df0f840b | 617 | PERROR("ioctl"); |
f3ed775e DG |
618 | ERR("Fail to flush buffer for stream %d (ret: %d)", |
619 | stream->fd, ret); | |
620 | } | |
621 | } | |
622 | ||
623 | return 0; | |
624 | } | |
625 | ||
8c0faa1d | 626 | /* |
050349bb | 627 | * Stop tracing session. |
8c0faa1d DG |
628 | */ |
629 | int kernel_stop_session(struct ltt_kernel_session *session) | |
630 | { | |
631 | int ret; | |
632 | ||
0525e9ae DG |
633 | assert(session); |
634 | ||
8c0faa1d DG |
635 | ret = kernctl_stop_session(session->fd); |
636 | if (ret < 0) { | |
637 | goto error; | |
638 | } | |
639 | ||
640 | DBG("Kernel session stopped"); | |
641 | ||
642 | return 0; | |
643 | ||
644 | error: | |
645 | return ret; | |
646 | } | |
647 | ||
648 | /* | |
050349bb DG |
649 | * Open stream of channel, register it to the kernel tracer and add it |
650 | * to the stream list of the channel. | |
8c0faa1d | 651 | * |
e9e304da MD |
652 | * Note: given that the streams may appear in random order wrt CPU |
653 | * number (e.g. cpu hotplug), the index value of the stream number in | |
654 | * the stream name is not necessarily linked to the CPU number. | |
655 | * | |
050349bb | 656 | * Return the number of created stream. Else, a negative value. |
8c0faa1d | 657 | */ |
f3ed775e | 658 | int kernel_open_channel_stream(struct ltt_kernel_channel *channel) |
8c0faa1d | 659 | { |
e9e304da | 660 | int ret; |
8c0faa1d DG |
661 | struct ltt_kernel_stream *lks; |
662 | ||
0525e9ae DG |
663 | assert(channel); |
664 | ||
5a47c6a2 | 665 | while ((ret = kernctl_create_stream(channel->fd)) >= 0) { |
e9e304da MD |
666 | lks = trace_kernel_create_stream(channel->channel->name, |
667 | channel->stream_count); | |
8c0faa1d | 668 | if (lks == NULL) { |
799e2c4f MD |
669 | ret = close(ret); |
670 | if (ret) { | |
671 | PERROR("close"); | |
672 | } | |
8c0faa1d DG |
673 | goto error; |
674 | } | |
675 | ||
676 | lks->fd = ret; | |
7b395890 DG |
677 | /* Prevent fd duplication after execlp() */ |
678 | ret = fcntl(lks->fd, F_SETFD, FD_CLOEXEC); | |
679 | if (ret < 0) { | |
df0f840b | 680 | PERROR("fcntl session fd"); |
7b395890 DG |
681 | } |
682 | ||
1624d5b7 JD |
683 | lks->tracefile_size = channel->channel->attr.tracefile_size; |
684 | lks->tracefile_count = channel->channel->attr.tracefile_count; | |
685 | ||
e9e304da | 686 | /* Add stream to channel stream list */ |
8c0faa1d DG |
687 | cds_list_add(&lks->list, &channel->stream_list.head); |
688 | channel->stream_count++; | |
8c0faa1d | 689 | |
00e2e675 DG |
690 | DBG("Kernel stream %s created (fd: %d, state: %d)", lks->name, lks->fd, |
691 | lks->state); | |
54012638 | 692 | } |
8c0faa1d DG |
693 | |
694 | return channel->stream_count; | |
695 | ||
696 | error: | |
54012638 | 697 | return -1; |
8c0faa1d DG |
698 | } |
699 | ||
700 | /* | |
050349bb | 701 | * Open the metadata stream and set it to the kernel session. |
8c0faa1d | 702 | */ |
f3ed775e | 703 | int kernel_open_metadata_stream(struct ltt_kernel_session *session) |
8c0faa1d DG |
704 | { |
705 | int ret; | |
706 | ||
0525e9ae DG |
707 | assert(session); |
708 | ||
8c0faa1d DG |
709 | ret = kernctl_create_stream(session->metadata->fd); |
710 | if (ret < 0) { | |
df0f840b | 711 | PERROR("kernel create metadata stream"); |
8c0faa1d DG |
712 | goto error; |
713 | } | |
714 | ||
715 | DBG("Kernel metadata stream created (fd: %d)", ret); | |
716 | session->metadata_stream_fd = ret; | |
7b395890 DG |
717 | /* Prevent fd duplication after execlp() */ |
718 | ret = fcntl(session->metadata_stream_fd, F_SETFD, FD_CLOEXEC); | |
719 | if (ret < 0) { | |
df0f840b | 720 | PERROR("fcntl session fd"); |
7b395890 | 721 | } |
aaf26714 DG |
722 | |
723 | return 0; | |
724 | ||
725 | error: | |
54012638 | 726 | return -1; |
aaf26714 | 727 | } |
2ef84c95 DG |
728 | |
729 | /* | |
9f19cc17 | 730 | * Get the event list from the kernel tracer and return the number of elements. |
2ef84c95 | 731 | */ |
9f19cc17 | 732 | ssize_t kernel_list_events(int tracer_fd, struct lttng_event **events) |
2ef84c95 | 733 | { |
53efb85a | 734 | int fd, ret; |
9f19cc17 DG |
735 | char *event; |
736 | size_t nbmem, count = 0; | |
2ef84c95 | 737 | FILE *fp; |
9f19cc17 | 738 | struct lttng_event *elist; |
2ef84c95 | 739 | |
0525e9ae DG |
740 | assert(events); |
741 | ||
2ef84c95 DG |
742 | fd = kernctl_tracepoint_list(tracer_fd); |
743 | if (fd < 0) { | |
df0f840b | 744 | PERROR("kernel tracepoint list"); |
2ef84c95 DG |
745 | goto error; |
746 | } | |
747 | ||
748 | fp = fdopen(fd, "r"); | |
749 | if (fp == NULL) { | |
df0f840b | 750 | PERROR("kernel tracepoint list fdopen"); |
61b73b12 | 751 | goto error_fp; |
2ef84c95 DG |
752 | } |
753 | ||
754 | /* | |
755 | * Init memory size counter | |
756 | * See kernel-ctl.h for explanation of this value | |
757 | */ | |
6725fe19 | 758 | nbmem = KERNEL_EVENT_INIT_LIST_SIZE; |
ba7f0ae5 | 759 | elist = zmalloc(sizeof(struct lttng_event) * nbmem); |
3b870559 MD |
760 | if (elist == NULL) { |
761 | PERROR("alloc list events"); | |
762 | count = -ENOMEM; | |
763 | goto end; | |
764 | } | |
2ef84c95 | 765 | |
53efb85a | 766 | while (fscanf(fp, "event { name = %m[^;]; };\n", &event) == 1) { |
6725fe19 | 767 | if (count >= nbmem) { |
3b870559 | 768 | struct lttng_event *new_elist; |
53efb85a | 769 | size_t new_nbmem; |
3b870559 | 770 | |
53efb85a MD |
771 | new_nbmem = nbmem << 1; |
772 | DBG("Reallocating event list from %zu to %zu bytes", | |
773 | nbmem, new_nbmem); | |
774 | new_elist = realloc(elist, new_nbmem * sizeof(struct lttng_event)); | |
3b870559 | 775 | if (new_elist == NULL) { |
df0f840b | 776 | PERROR("realloc list events"); |
3b870559 MD |
777 | free(event); |
778 | free(elist); | |
61b73b12 MD |
779 | count = -ENOMEM; |
780 | goto end; | |
2ef84c95 | 781 | } |
53efb85a MD |
782 | /* Zero the new memory */ |
783 | memset(new_elist + nbmem, 0, | |
784 | (new_nbmem - nbmem) * sizeof(struct lttng_event)); | |
785 | nbmem = new_nbmem; | |
3b870559 | 786 | elist = new_elist; |
2ef84c95 | 787 | } |
99497cd0 MD |
788 | strncpy(elist[count].name, event, LTTNG_SYMBOL_NAME_LEN); |
789 | elist[count].name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0'; | |
67b9d018 | 790 | elist[count].enabled = -1; |
9f19cc17 | 791 | count++; |
3b870559 | 792 | free(event); |
2ef84c95 DG |
793 | } |
794 | ||
9f19cc17 | 795 | *events = elist; |
ced2f820 | 796 | DBG("Kernel list events done (%zu events)", count); |
61b73b12 | 797 | end: |
799e2c4f MD |
798 | ret = fclose(fp); /* closes both fp and fd */ |
799 | if (ret) { | |
800 | PERROR("fclose"); | |
801 | } | |
9f19cc17 | 802 | return count; |
2ef84c95 | 803 | |
61b73b12 | 804 | error_fp: |
799e2c4f MD |
805 | ret = close(fd); |
806 | if (ret) { | |
807 | PERROR("close"); | |
808 | } | |
2ef84c95 DG |
809 | error: |
810 | return -1; | |
811 | } | |
096102bd DG |
812 | |
813 | /* | |
814 | * Get kernel version and validate it. | |
815 | */ | |
816 | int kernel_validate_version(int tracer_fd) | |
817 | { | |
818 | int ret; | |
819 | struct lttng_kernel_tracer_version version; | |
c052142c | 820 | struct lttng_kernel_tracer_abi_version abi_version; |
096102bd DG |
821 | |
822 | ret = kernctl_tracer_version(tracer_fd, &version); | |
823 | if (ret < 0) { | |
521dd134 | 824 | ERR("Failed to retrieve the lttng-modules version"); |
096102bd DG |
825 | goto error; |
826 | } | |
827 | ||
828 | /* Validate version */ | |
c052142c MD |
829 | if (version.major != VERSION_MAJOR) { |
830 | ERR("Kernel tracer major version (%d) is not compatible with lttng-tools major version (%d)", | |
831 | version.major, VERSION_MAJOR); | |
096102bd | 832 | goto error_version; |
096102bd | 833 | } |
c052142c MD |
834 | ret = kernctl_tracer_abi_version(tracer_fd, &abi_version); |
835 | if (ret < 0) { | |
521dd134 | 836 | ERR("Failed to retrieve lttng-modules ABI version"); |
c052142c MD |
837 | goto error; |
838 | } | |
839 | if (abi_version.major != LTTNG_MODULES_ABI_MAJOR_VERSION) { | |
521dd134 | 840 | ERR("Kernel tracer ABI version (%d.%d) does not match the expected ABI major version (%d.*)", |
c052142c MD |
841 | abi_version.major, abi_version.minor, |
842 | LTTNG_MODULES_ABI_MAJOR_VERSION); | |
843 | goto error; | |
844 | } | |
845 | DBG2("Kernel tracer version validated (%d.%d, ABI %d.%d)", | |
846 | version.major, version.minor, | |
847 | abi_version.major, abi_version.minor); | |
096102bd DG |
848 | return 0; |
849 | ||
850 | error_version: | |
096102bd DG |
851 | ret = -1; |
852 | ||
853 | error: | |
521dd134 | 854 | ERR("Kernel tracer version check failed; kernel tracing will not be available"); |
096102bd DG |
855 | return ret; |
856 | } | |
335a95b7 MD |
857 | |
858 | /* | |
859 | * Kernel work-arounds called at the start of sessiond main(). | |
860 | */ | |
861 | int init_kernel_workarounds(void) | |
862 | { | |
8936c33a | 863 | int ret; |
335a95b7 MD |
864 | FILE *fp; |
865 | ||
866 | /* | |
867 | * boot_id needs to be read once before being used concurrently | |
868 | * to deal with a Linux kernel race. A fix is proposed for | |
869 | * upstream, but the work-around is needed for older kernels. | |
870 | */ | |
871 | fp = fopen("/proc/sys/kernel/random/boot_id", "r"); | |
872 | if (!fp) { | |
873 | goto end_boot_id; | |
874 | } | |
875 | while (!feof(fp)) { | |
876 | char buf[37] = ""; | |
877 | ||
8936c33a DG |
878 | ret = fread(buf, 1, sizeof(buf), fp); |
879 | if (ret < 0) { | |
880 | /* Ignore error, we don't really care */ | |
881 | } | |
335a95b7 | 882 | } |
799e2c4f MD |
883 | ret = fclose(fp); |
884 | if (ret) { | |
885 | PERROR("fclose"); | |
886 | } | |
335a95b7 | 887 | end_boot_id: |
335a95b7 MD |
888 | return 0; |
889 | } | |
2f77fc4b DG |
890 | |
891 | /* | |
892 | * Complete teardown of a kernel session. | |
893 | */ | |
894 | void kernel_destroy_session(struct ltt_kernel_session *ksess) | |
895 | { | |
896 | if (ksess == NULL) { | |
897 | DBG3("No kernel session when tearing down session"); | |
898 | return; | |
899 | } | |
900 | ||
901 | DBG("Tearing down kernel session"); | |
902 | ||
07b86b52 | 903 | /* |
15dc512a DG |
904 | * Destroy channels on the consumer if at least one FD has been sent and we |
905 | * are in no output mode because the streams are in *no* monitor mode so we | |
906 | * have to send a command to clean them up or else they leaked. | |
07b86b52 | 907 | */ |
15dc512a | 908 | if (!ksess->output_traces && ksess->consumer_fds_sent) { |
07b86b52 JD |
909 | int ret; |
910 | struct consumer_socket *socket; | |
911 | struct lttng_ht_iter iter; | |
912 | ||
913 | /* For each consumer socket. */ | |
d069d577 | 914 | rcu_read_lock(); |
07b86b52 JD |
915 | cds_lfht_for_each_entry(ksess->consumer->socks->ht, &iter.iter, |
916 | socket, node.node) { | |
917 | struct ltt_kernel_channel *chan; | |
918 | ||
919 | /* For each channel, ask the consumer to destroy it. */ | |
920 | cds_list_for_each_entry(chan, &ksess->channel_list.head, list) { | |
921 | ret = kernel_consumer_destroy_channel(socket, chan); | |
922 | if (ret < 0) { | |
923 | /* Consumer is probably dead. Use next socket. */ | |
924 | continue; | |
925 | } | |
926 | } | |
927 | } | |
d069d577 | 928 | rcu_read_unlock(); |
07b86b52 JD |
929 | } |
930 | ||
2f77fc4b DG |
931 | /* Close any relayd session */ |
932 | consumer_output_send_destroy_relayd(ksess->consumer); | |
933 | ||
934 | trace_kernel_destroy_session(ksess); | |
935 | } | |
fb5f35b6 DG |
936 | |
937 | /* | |
938 | * Destroy a kernel channel object. It does not do anything on the tracer side. | |
939 | */ | |
940 | void kernel_destroy_channel(struct ltt_kernel_channel *kchan) | |
941 | { | |
942 | struct ltt_kernel_session *ksess = NULL; | |
943 | ||
944 | assert(kchan); | |
945 | assert(kchan->channel); | |
946 | ||
947 | DBG3("Kernel destroy channel %s", kchan->channel->name); | |
948 | ||
949 | /* Update channel count of associated session. */ | |
950 | if (kchan->session) { | |
951 | /* Keep pointer reference so we can update it after the destroy. */ | |
952 | ksess = kchan->session; | |
953 | } | |
954 | ||
955 | trace_kernel_destroy_channel(kchan); | |
956 | ||
957 | /* | |
958 | * At this point the kernel channel is not visible anymore. This is safe | |
959 | * since in order to work on a visible kernel session, the tracing session | |
960 | * lock (ltt_session.lock) MUST be acquired. | |
961 | */ | |
962 | if (ksess) { | |
963 | ksess->channel_count--; | |
964 | } | |
965 | } | |
6dc3064a DG |
966 | |
967 | /* | |
968 | * Take a snapshot for a given kernel session. | |
969 | * | |
2a06df8d | 970 | * Return 0 on success or else return a LTTNG_ERR code. |
6dc3064a DG |
971 | */ |
972 | int kernel_snapshot_record(struct ltt_kernel_session *ksess, | |
d07ceecd MD |
973 | struct snapshot_output *output, int wait, |
974 | uint64_t nb_packets_per_stream) | |
6dc3064a | 975 | { |
2a06df8d | 976 | int err, ret, saved_metadata_fd; |
6dc3064a DG |
977 | struct consumer_socket *socket; |
978 | struct lttng_ht_iter iter; | |
979 | struct ltt_kernel_metadata *saved_metadata; | |
980 | ||
981 | assert(ksess); | |
982 | assert(ksess->consumer); | |
983 | assert(output); | |
984 | ||
985 | DBG("Kernel snapshot record started"); | |
986 | ||
987 | /* Save current metadata since the following calls will change it. */ | |
988 | saved_metadata = ksess->metadata; | |
989 | saved_metadata_fd = ksess->metadata_stream_fd; | |
990 | ||
991 | rcu_read_lock(); | |
992 | ||
993 | ret = kernel_open_metadata(ksess); | |
994 | if (ret < 0) { | |
995 | ret = LTTNG_ERR_KERN_META_FAIL; | |
996 | goto error; | |
997 | } | |
998 | ||
999 | ret = kernel_open_metadata_stream(ksess); | |
1000 | if (ret < 0) { | |
1001 | ret = LTTNG_ERR_KERN_META_FAIL; | |
1002 | goto error_open_stream; | |
1003 | } | |
1004 | ||
1005 | /* Send metadata to consumer and snapshot everything. */ | |
1006 | cds_lfht_for_each_entry(ksess->consumer->socks->ht, &iter.iter, | |
1007 | socket, node.node) { | |
1008 | struct consumer_output *saved_output; | |
1009 | struct ltt_kernel_channel *chan; | |
6dc3064a DG |
1010 | |
1011 | /* | |
1012 | * Temporarly switch consumer output for our snapshot output. As long | |
1013 | * as the session lock is taken, this is safe. | |
1014 | */ | |
1015 | saved_output = ksess->consumer; | |
1016 | ksess->consumer = output->consumer; | |
1017 | ||
1018 | pthread_mutex_lock(socket->lock); | |
1019 | /* This stream must not be monitored by the consumer. */ | |
07b86b52 | 1020 | ret = kernel_consumer_add_metadata(socket, ksess, 0); |
6dc3064a | 1021 | pthread_mutex_unlock(socket->lock); |
07b86b52 | 1022 | /* Put back the saved consumer output into the session. */ |
6dc3064a DG |
1023 | ksess->consumer = saved_output; |
1024 | if (ret < 0) { | |
1025 | ret = LTTNG_ERR_KERN_CONSUMER_FAIL; | |
1026 | goto error_consumer; | |
1027 | } | |
1028 | ||
1029 | /* For each channel, ask the consumer to snapshot it. */ | |
1030 | cds_list_for_each_entry(chan, &ksess->channel_list.head, list) { | |
07b86b52 | 1031 | pthread_mutex_lock(socket->lock); |
6dc3064a | 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); |
07b86b52 | 1036 | pthread_mutex_unlock(socket->lock); |
6dc3064a DG |
1037 | if (ret < 0) { |
1038 | ret = LTTNG_ERR_KERN_CONSUMER_FAIL; | |
2a06df8d DG |
1039 | (void) kernel_consumer_destroy_metadata(socket, |
1040 | ksess->metadata); | |
6dc3064a DG |
1041 | goto error_consumer; |
1042 | } | |
1043 | } | |
1044 | ||
1045 | /* Snapshot metadata, */ | |
07b86b52 | 1046 | pthread_mutex_lock(socket->lock); |
6dc3064a | 1047 | ret = consumer_snapshot_channel(socket, ksess->metadata->fd, output, |
5c786ded | 1048 | 1, ksess->uid, ksess->gid, |
d07ceecd | 1049 | DEFAULT_KERNEL_TRACE_DIR, wait, 0); |
07b86b52 | 1050 | pthread_mutex_unlock(socket->lock); |
6dc3064a DG |
1051 | if (ret < 0) { |
1052 | ret = LTTNG_ERR_KERN_CONSUMER_FAIL; | |
1053 | goto error_consumer; | |
1054 | } | |
07b86b52 JD |
1055 | |
1056 | /* | |
1057 | * The metadata snapshot is done, ask the consumer to destroy it since | |
1058 | * it's not monitored on the consumer side. | |
1059 | */ | |
1060 | (void) kernel_consumer_destroy_metadata(socket, ksess->metadata); | |
6dc3064a DG |
1061 | } |
1062 | ||
fac41e72 DG |
1063 | ret = LTTNG_OK; |
1064 | ||
6dc3064a DG |
1065 | error_consumer: |
1066 | /* Close newly opened metadata stream. It's now on the consumer side. */ | |
2a06df8d DG |
1067 | err = close(ksess->metadata_stream_fd); |
1068 | if (err < 0) { | |
6dc3064a DG |
1069 | PERROR("close snapshot kernel"); |
1070 | } | |
1071 | ||
1072 | error_open_stream: | |
1073 | trace_kernel_destroy_metadata(ksess->metadata); | |
1074 | error: | |
1075 | /* Restore metadata state.*/ | |
1076 | ksess->metadata = saved_metadata; | |
1077 | ksess->metadata_stream_fd = saved_metadata_fd; | |
1078 | ||
1079 | rcu_read_unlock(); | |
1080 | return ret; | |
1081 | } | |
834978fd DG |
1082 | |
1083 | /* | |
1084 | * Get the syscall mask array from the kernel tracer. | |
1085 | * | |
1086 | * Return 0 on success else a negative value. In both case, syscall_mask should | |
1087 | * be freed. | |
1088 | */ | |
1089 | int kernel_syscall_mask(int chan_fd, char **syscall_mask, uint32_t *nr_bits) | |
1090 | { | |
1091 | assert(syscall_mask); | |
1092 | assert(nr_bits); | |
1093 | ||
1094 | return kernctl_syscall_mask(chan_fd, syscall_mask, nr_bits); | |
1095 | } |