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. |
d65106b1 DG |
39 | */ |
40 | int kernel_add_channel_context(struct ltt_kernel_channel *chan, | |
645328ae | 41 | struct ltt_kernel_context *ctx) |
d65106b1 DG |
42 | { |
43 | int ret; | |
44 | ||
0525e9ae DG |
45 | assert(chan); |
46 | assert(ctx); | |
47 | ||
d65106b1 | 48 | DBG("Adding context to channel %s", chan->channel->name); |
645328ae | 49 | ret = kernctl_add_context(chan->fd, &ctx->ctx); |
d65106b1 | 50 | if (ret < 0) { |
32af2c95 | 51 | switch (-ret) { |
1ae5e83e JD |
52 | case ENOSYS: |
53 | /* Exists but not available for this kernel */ | |
54 | ret = LTTNG_ERR_KERN_CONTEXT_UNAVAILABLE; | |
55 | goto error; | |
56 | case EEXIST: | |
b579acd9 DG |
57 | /* If EEXIST, we just ignore the error */ |
58 | ret = 0; | |
1ae5e83e JD |
59 | goto end; |
60 | default: | |
61 | PERROR("add context ioctl"); | |
62 | ret = LTTNG_ERR_KERN_CONTEXT_FAIL; | |
63 | goto error; | |
b579acd9 | 64 | } |
d65106b1 | 65 | } |
1cacb121 | 66 | ret = 0; |
d65106b1 | 67 | |
1ae5e83e | 68 | end: |
645328ae | 69 | cds_list_add_tail(&ctx->list, &chan->ctx_list); |
d65106b1 DG |
70 | error: |
71 | return ret; | |
72 | } | |
73 | ||
20fe2104 | 74 | /* |
050349bb DG |
75 | * Create a new kernel session, register it to the kernel tracer and add it to |
76 | * the session daemon session. | |
20fe2104 | 77 | */ |
8c0faa1d | 78 | int kernel_create_session(struct ltt_session *session, int tracer_fd) |
20fe2104 DG |
79 | { |
80 | int ret; | |
81 | struct ltt_kernel_session *lks; | |
82 | ||
0525e9ae DG |
83 | assert(session); |
84 | ||
54012638 | 85 | /* Allocate data structure */ |
dec56f6c | 86 | lks = trace_kernel_create_session(); |
20fe2104 | 87 | if (lks == NULL) { |
54012638 | 88 | ret = -1; |
20fe2104 DG |
89 | goto error; |
90 | } | |
91 | ||
54012638 | 92 | /* Kernel tracer session creation */ |
20fe2104 DG |
93 | ret = kernctl_create_session(tracer_fd); |
94 | if (ret < 0) { | |
df0f840b | 95 | PERROR("ioctl kernel create session"); |
20fe2104 DG |
96 | goto error; |
97 | } | |
98 | ||
20fe2104 | 99 | lks->fd = ret; |
7b395890 DG |
100 | /* Prevent fd duplication after execlp() */ |
101 | ret = fcntl(lks->fd, F_SETFD, FD_CLOEXEC); | |
102 | if (ret < 0) { | |
df0f840b | 103 | PERROR("fcntl session fd"); |
7b395890 DG |
104 | } |
105 | ||
53632229 | 106 | lks->id = session->id; |
3bd1e081 | 107 | lks->consumer_fds_sent = 0; |
8c0faa1d | 108 | session->kernel_session = lks; |
8c0faa1d DG |
109 | |
110 | DBG("Kernel session created (fd: %d)", lks->fd); | |
20fe2104 DG |
111 | |
112 | return 0; | |
113 | ||
114 | error: | |
5f62c685 DG |
115 | if (lks) { |
116 | trace_kernel_destroy_session(lks); | |
117 | } | |
20fe2104 DG |
118 | return ret; |
119 | } | |
120 | ||
121 | /* | |
050349bb DG |
122 | * Create a kernel channel, register it to the kernel tracer and add it to the |
123 | * kernel session. | |
20fe2104 | 124 | */ |
050349bb | 125 | int kernel_create_channel(struct ltt_kernel_session *session, |
fdd9eb17 | 126 | struct lttng_channel *chan) |
20fe2104 DG |
127 | { |
128 | int ret; | |
129 | struct ltt_kernel_channel *lkc; | |
20fe2104 | 130 | |
0525e9ae DG |
131 | assert(session); |
132 | assert(chan); | |
0525e9ae | 133 | |
54012638 | 134 | /* Allocate kernel channel */ |
fdd9eb17 | 135 | lkc = trace_kernel_create_channel(chan); |
54012638 | 136 | if (lkc == NULL) { |
20fe2104 DG |
137 | goto error; |
138 | } | |
139 | ||
ecc48a90 | 140 | DBG3("Kernel create channel %s with attr: %d, %" PRIu64 ", %" PRIu64 ", %u, %u, %d, %d", |
fdd9eb17 | 141 | chan->name, lkc->channel->attr.overwrite, |
173af62f DG |
142 | lkc->channel->attr.subbuf_size, lkc->channel->attr.num_subbuf, |
143 | lkc->channel->attr.switch_timer_interval, lkc->channel->attr.read_timer_interval, | |
ecc48a90 | 144 | lkc->channel->attr.live_timer_interval, lkc->channel->attr.output); |
173af62f | 145 | |
54012638 | 146 | /* Kernel tracer channel creation */ |
f3ed775e | 147 | ret = kernctl_create_channel(session->fd, &lkc->channel->attr); |
20fe2104 | 148 | if (ret < 0) { |
df0f840b | 149 | PERROR("ioctl kernel create channel"); |
20fe2104 DG |
150 | goto error; |
151 | } | |
152 | ||
54012638 | 153 | /* Setup the channel fd */ |
20fe2104 | 154 | lkc->fd = ret; |
7b395890 DG |
155 | /* Prevent fd duplication after execlp() */ |
156 | ret = fcntl(lkc->fd, F_SETFD, FD_CLOEXEC); | |
157 | if (ret < 0) { | |
df0f840b | 158 | PERROR("fcntl session fd"); |
7b395890 DG |
159 | } |
160 | ||
54012638 | 161 | /* Add channel to session */ |
8c0faa1d DG |
162 | cds_list_add(&lkc->list, &session->channel_list.head); |
163 | session->channel_count++; | |
fb5f35b6 | 164 | lkc->session = session; |
20fe2104 | 165 | |
00e2e675 | 166 | DBG("Kernel channel %s created (fd: %d)", lkc->channel->name, lkc->fd); |
20fe2104 DG |
167 | |
168 | return 0; | |
169 | ||
170 | error: | |
5f62c685 DG |
171 | if (lkc) { |
172 | free(lkc->channel); | |
173 | free(lkc); | |
174 | } | |
54012638 | 175 | return -1; |
20fe2104 | 176 | } |
f34daff7 DG |
177 | |
178 | /* | |
050349bb DG |
179 | * Create a kernel event, enable it to the kernel tracer and add it to the |
180 | * channel event list of the kernel session. | |
49d21f93 | 181 | * We own filter_expression and filter. |
f34daff7 | 182 | */ |
050349bb | 183 | int kernel_create_event(struct lttng_event *ev, |
00a62084 MD |
184 | struct ltt_kernel_channel *channel, |
185 | char *filter_expression, | |
186 | struct lttng_filter_bytecode *filter) | |
f34daff7 DG |
187 | { |
188 | int ret; | |
189 | struct ltt_kernel_event *event; | |
f34daff7 | 190 | |
0525e9ae DG |
191 | assert(ev); |
192 | assert(channel); | |
193 | ||
a969e101 | 194 | /* We pass ownership of filter_expression and filter */ |
00a62084 MD |
195 | event = trace_kernel_create_event(ev, filter_expression, |
196 | filter); | |
54012638 | 197 | if (event == NULL) { |
d87bfb32 | 198 | ret = -1; |
f34daff7 DG |
199 | goto error; |
200 | } | |
201 | ||
f3ed775e DG |
202 | ret = kernctl_create_event(channel->fd, event->event); |
203 | if (ret < 0) { | |
32af2c95 | 204 | switch (-ret) { |
bd29c13d DG |
205 | case EEXIST: |
206 | break; | |
207 | case ENOSYS: | |
208 | WARN("Event type not implemented"); | |
209 | break; | |
8197a339 DG |
210 | case ENOENT: |
211 | WARN("Event %s not found!", ev->name); | |
212 | break; | |
bd29c13d | 213 | default: |
d87bfb32 DG |
214 | PERROR("create event ioctl"); |
215 | } | |
e953ef25 | 216 | goto free_event; |
8c0faa1d | 217 | } |
f34daff7 | 218 | |
d0ae4ea8 | 219 | event->type = ev->type; |
f3ed775e | 220 | event->fd = ret; |
7b395890 DG |
221 | /* Prevent fd duplication after execlp() */ |
222 | ret = fcntl(event->fd, F_SETFD, FD_CLOEXEC); | |
223 | if (ret < 0) { | |
df0f840b | 224 | PERROR("fcntl session fd"); |
7b395890 DG |
225 | } |
226 | ||
00a62084 MD |
227 | if (filter) { |
228 | ret = kernctl_filter(event->fd, filter); | |
229 | if (ret) { | |
230 | goto filter_error; | |
231 | } | |
232 | } | |
233 | ||
234 | ret = kernctl_enable(event->fd); | |
235 | if (ret < 0) { | |
32af2c95 | 236 | switch (-ret) { |
00a62084 MD |
237 | case EEXIST: |
238 | ret = LTTNG_ERR_KERN_EVENT_EXIST; | |
239 | break; | |
240 | default: | |
241 | PERROR("enable kernel event"); | |
242 | break; | |
243 | } | |
244 | goto enable_error; | |
245 | } | |
246 | ||
f3ed775e DG |
247 | /* Add event to event list */ |
248 | cds_list_add(&event->list, &channel->events_list.head); | |
cbbbb275 DG |
249 | channel->event_count++; |
250 | ||
e953ef25 DG |
251 | DBG("Event %s created (fd: %d)", ev->name, event->fd); |
252 | ||
253 | return 0; | |
254 | ||
00a62084 MD |
255 | enable_error: |
256 | filter_error: | |
257 | { | |
258 | int closeret; | |
259 | ||
260 | closeret = close(event->fd); | |
261 | if (closeret) { | |
262 | PERROR("close event fd"); | |
263 | } | |
264 | } | |
e953ef25 DG |
265 | free_event: |
266 | free(event); | |
267 | error: | |
d87bfb32 | 268 | return ret; |
e953ef25 DG |
269 | } |
270 | ||
26cc6b4e | 271 | /* |
050349bb | 272 | * Disable a kernel channel. |
26cc6b4e DG |
273 | */ |
274 | int kernel_disable_channel(struct ltt_kernel_channel *chan) | |
275 | { | |
276 | int ret; | |
277 | ||
0525e9ae DG |
278 | assert(chan); |
279 | ||
26cc6b4e DG |
280 | ret = kernctl_disable(chan->fd); |
281 | if (ret < 0) { | |
df0f840b | 282 | PERROR("disable chan ioctl"); |
26cc6b4e DG |
283 | goto error; |
284 | } | |
285 | ||
286 | chan->enabled = 0; | |
287 | DBG("Kernel channel %s disabled (fd: %d)", chan->channel->name, chan->fd); | |
288 | ||
289 | return 0; | |
290 | ||
291 | error: | |
292 | return ret; | |
293 | } | |
294 | ||
d36b8583 | 295 | /* |
050349bb | 296 | * Enable a kernel channel. |
d36b8583 DG |
297 | */ |
298 | int kernel_enable_channel(struct ltt_kernel_channel *chan) | |
299 | { | |
300 | int ret; | |
301 | ||
0525e9ae DG |
302 | assert(chan); |
303 | ||
d36b8583 | 304 | ret = kernctl_enable(chan->fd); |
32af2c95 | 305 | if (ret < 0 && ret != -EEXIST) { |
df0f840b | 306 | PERROR("Enable kernel chan"); |
d36b8583 DG |
307 | goto error; |
308 | } | |
309 | ||
310 | chan->enabled = 1; | |
311 | DBG("Kernel channel %s enabled (fd: %d)", chan->channel->name, chan->fd); | |
312 | ||
313 | return 0; | |
314 | ||
315 | error: | |
316 | return ret; | |
317 | } | |
318 | ||
19e70852 | 319 | /* |
050349bb | 320 | * Enable a kernel event. |
19e70852 DG |
321 | */ |
322 | int kernel_enable_event(struct ltt_kernel_event *event) | |
323 | { | |
324 | int ret; | |
325 | ||
0525e9ae DG |
326 | assert(event); |
327 | ||
19e70852 | 328 | ret = kernctl_enable(event->fd); |
42224349 | 329 | if (ret < 0) { |
32af2c95 | 330 | switch (-ret) { |
42224349 | 331 | case EEXIST: |
f73fabfd | 332 | ret = LTTNG_ERR_KERN_EVENT_EXIST; |
42224349 DG |
333 | break; |
334 | default: | |
335 | PERROR("enable kernel event"); | |
336 | break; | |
337 | } | |
19e70852 DG |
338 | goto error; |
339 | } | |
340 | ||
341 | event->enabled = 1; | |
342 | DBG("Kernel event %s enabled (fd: %d)", event->event->name, event->fd); | |
343 | ||
344 | return 0; | |
345 | ||
346 | error: | |
d36b8583 | 347 | return ret; |
19e70852 DG |
348 | } |
349 | ||
e953ef25 | 350 | /* |
050349bb | 351 | * Disable a kernel event. |
e953ef25 | 352 | */ |
19e70852 | 353 | int kernel_disable_event(struct ltt_kernel_event *event) |
e953ef25 DG |
354 | { |
355 | int ret; | |
19e70852 | 356 | |
0525e9ae DG |
357 | assert(event); |
358 | ||
19e70852 | 359 | ret = kernctl_disable(event->fd); |
42224349 | 360 | if (ret < 0) { |
32af2c95 | 361 | switch (-ret) { |
42224349 | 362 | case EEXIST: |
f73fabfd | 363 | ret = LTTNG_ERR_KERN_EVENT_EXIST; |
42224349 DG |
364 | break; |
365 | default: | |
366 | PERROR("disable kernel event"); | |
367 | break; | |
368 | } | |
19e70852 | 369 | goto error; |
e953ef25 | 370 | } |
f3ed775e | 371 | |
19e70852 DG |
372 | event->enabled = 0; |
373 | DBG("Kernel event %s disabled (fd: %d)", event->event->name, event->fd); | |
374 | ||
f34daff7 DG |
375 | return 0; |
376 | ||
377 | error: | |
d36b8583 | 378 | return ret; |
f34daff7 | 379 | } |
aaf26714 | 380 | |
6e911cad | 381 | |
ccf10263 MD |
382 | int kernel_track_pid(struct ltt_kernel_session *session, int pid) |
383 | { | |
7c493d31 MD |
384 | int ret; |
385 | ||
ccf10263 MD |
386 | DBG("Kernel track PID %d for session id %" PRIu64 ".", |
387 | pid, session->id); | |
7c493d31 MD |
388 | ret = kernctl_track_pid(session->fd, pid); |
389 | if (!ret) { | |
390 | return LTTNG_OK; | |
391 | } | |
32af2c95 | 392 | switch (-ret) { |
7c493d31 MD |
393 | case EINVAL: |
394 | return LTTNG_ERR_INVALID; | |
395 | case ENOMEM: | |
396 | return LTTNG_ERR_NOMEM; | |
397 | case EEXIST: | |
398 | return LTTNG_ERR_PID_TRACKED; | |
399 | default: | |
400 | return LTTNG_ERR_UNK; | |
401 | } | |
ccf10263 MD |
402 | } |
403 | ||
404 | int kernel_untrack_pid(struct ltt_kernel_session *session, int pid) | |
405 | { | |
7c493d31 MD |
406 | int ret; |
407 | ||
ccf10263 MD |
408 | DBG("Kernel untrack PID %d for session id %" PRIu64 ".", |
409 | pid, session->id); | |
7c493d31 MD |
410 | ret = kernctl_untrack_pid(session->fd, pid); |
411 | if (!ret) { | |
412 | return LTTNG_OK; | |
413 | } | |
32af2c95 | 414 | switch (-ret) { |
7c493d31 MD |
415 | case EINVAL: |
416 | return LTTNG_ERR_INVALID; | |
417 | case ENOMEM: | |
418 | return LTTNG_ERR_NOMEM; | |
419 | case ENOENT: | |
420 | return LTTNG_ERR_PID_NOT_TRACKED; | |
421 | default: | |
422 | return LTTNG_ERR_UNK; | |
423 | } | |
ccf10263 MD |
424 | } |
425 | ||
a5dfbb9d MD |
426 | ssize_t kernel_list_tracker_pids(struct ltt_kernel_session *session, |
427 | int **_pids) | |
428 | { | |
429 | int fd, ret; | |
430 | int pid; | |
431 | ssize_t nbmem, count = 0; | |
432 | FILE *fp; | |
433 | int *pids; | |
434 | ||
435 | fd = kernctl_list_tracker_pids(session->fd); | |
436 | if (fd < 0) { | |
437 | PERROR("kernel tracker pids list"); | |
438 | goto error; | |
439 | } | |
440 | ||
441 | fp = fdopen(fd, "r"); | |
442 | if (fp == NULL) { | |
443 | PERROR("kernel tracker pids list fdopen"); | |
444 | goto error_fp; | |
445 | } | |
446 | ||
447 | nbmem = KERNEL_TRACKER_PIDS_INIT_LIST_SIZE; | |
448 | pids = zmalloc(sizeof(*pids) * nbmem); | |
449 | if (pids == NULL) { | |
450 | PERROR("alloc list pids"); | |
451 | count = -ENOMEM; | |
452 | goto end; | |
453 | } | |
454 | ||
455 | while (fscanf(fp, "process { pid = %u; };\n", &pid) == 1) { | |
456 | if (count >= nbmem) { | |
457 | int *new_pids; | |
458 | size_t new_nbmem; | |
459 | ||
460 | new_nbmem = nbmem << 1; | |
461 | DBG("Reallocating pids list from %zu to %zu entries", | |
462 | nbmem, new_nbmem); | |
463 | new_pids = realloc(pids, new_nbmem * sizeof(*new_pids)); | |
464 | if (new_pids == NULL) { | |
465 | PERROR("realloc list events"); | |
466 | free(pids); | |
467 | count = -ENOMEM; | |
468 | goto end; | |
469 | } | |
470 | /* Zero the new memory */ | |
471 | memset(new_pids + nbmem, 0, | |
472 | (new_nbmem - nbmem) * sizeof(*new_pids)); | |
473 | nbmem = new_nbmem; | |
474 | pids = new_pids; | |
475 | } | |
476 | pids[count++] = pid; | |
477 | } | |
478 | ||
479 | *_pids = pids; | |
480 | DBG("Kernel list tracker pids done (%zd pids)", count); | |
481 | end: | |
482 | ret = fclose(fp); /* closes both fp and fd */ | |
483 | if (ret) { | |
484 | PERROR("fclose"); | |
485 | } | |
486 | return count; | |
487 | ||
488 | error_fp: | |
489 | ret = close(fd); | |
490 | if (ret) { | |
491 | PERROR("close"); | |
492 | } | |
493 | error: | |
494 | return -1; | |
495 | } | |
496 | ||
aaf26714 | 497 | /* |
050349bb DG |
498 | * Create kernel metadata, open from the kernel tracer and add it to the |
499 | * kernel session. | |
aaf26714 | 500 | */ |
a4b92340 | 501 | int kernel_open_metadata(struct ltt_kernel_session *session) |
aaf26714 DG |
502 | { |
503 | int ret; | |
74024a21 | 504 | struct ltt_kernel_metadata *lkm = NULL; |
aaf26714 | 505 | |
0525e9ae DG |
506 | assert(session); |
507 | ||
54012638 | 508 | /* Allocate kernel metadata */ |
a4b92340 | 509 | lkm = trace_kernel_create_metadata(); |
54012638 | 510 | if (lkm == NULL) { |
aaf26714 DG |
511 | goto error; |
512 | } | |
513 | ||
54012638 | 514 | /* Kernel tracer metadata creation */ |
f3ed775e | 515 | ret = kernctl_open_metadata(session->fd, &lkm->conf->attr); |
aaf26714 | 516 | if (ret < 0) { |
74024a21 | 517 | goto error_open; |
aaf26714 DG |
518 | } |
519 | ||
8c0faa1d | 520 | lkm->fd = ret; |
7b395890 DG |
521 | /* Prevent fd duplication after execlp() */ |
522 | ret = fcntl(lkm->fd, F_SETFD, FD_CLOEXEC); | |
523 | if (ret < 0) { | |
df0f840b | 524 | PERROR("fcntl session fd"); |
7b395890 DG |
525 | } |
526 | ||
aaf26714 | 527 | session->metadata = lkm; |
8c0faa1d | 528 | |
00e2e675 | 529 | DBG("Kernel metadata opened (fd: %d)", lkm->fd); |
8c0faa1d DG |
530 | |
531 | return 0; | |
532 | ||
74024a21 DG |
533 | error_open: |
534 | trace_kernel_destroy_metadata(lkm); | |
8c0faa1d | 535 | error: |
54012638 | 536 | return -1; |
8c0faa1d DG |
537 | } |
538 | ||
539 | /* | |
050349bb | 540 | * Start tracing session. |
8c0faa1d DG |
541 | */ |
542 | int kernel_start_session(struct ltt_kernel_session *session) | |
543 | { | |
544 | int ret; | |
545 | ||
0525e9ae DG |
546 | assert(session); |
547 | ||
8c0faa1d DG |
548 | ret = kernctl_start_session(session->fd); |
549 | if (ret < 0) { | |
df0f840b | 550 | PERROR("ioctl start session"); |
8c0faa1d DG |
551 | goto error; |
552 | } | |
553 | ||
554 | DBG("Kernel session started"); | |
555 | ||
556 | return 0; | |
557 | ||
558 | error: | |
559 | return ret; | |
560 | } | |
561 | ||
f3ed775e | 562 | /* |
050349bb | 563 | * Make a kernel wait to make sure in-flight probe have completed. |
f3ed775e DG |
564 | */ |
565 | void kernel_wait_quiescent(int fd) | |
566 | { | |
567 | int ret; | |
568 | ||
569 | DBG("Kernel quiescent wait on %d", fd); | |
570 | ||
571 | ret = kernctl_wait_quiescent(fd); | |
572 | if (ret < 0) { | |
df0f840b | 573 | PERROR("wait quiescent ioctl"); |
f3ed775e DG |
574 | ERR("Kernel quiescent wait failed"); |
575 | } | |
576 | } | |
577 | ||
578 | /* | |
f3ed775e DG |
579 | * Force flush buffer of metadata. |
580 | */ | |
581 | int kernel_metadata_flush_buffer(int fd) | |
582 | { | |
583 | int ret; | |
584 | ||
169d2cb7 DG |
585 | DBG("Kernel flushing metadata buffer on fd %d", fd); |
586 | ||
f3ed775e DG |
587 | ret = kernctl_buffer_flush(fd); |
588 | if (ret < 0) { | |
00e2e675 | 589 | ERR("Fail to flush metadata buffers %d (ret: %d)", fd, ret); |
f3ed775e DG |
590 | } |
591 | ||
592 | return 0; | |
593 | } | |
594 | ||
595 | /* | |
050349bb | 596 | * Force flush buffer for channel. |
f3ed775e DG |
597 | */ |
598 | int kernel_flush_buffer(struct ltt_kernel_channel *channel) | |
599 | { | |
600 | int ret; | |
601 | struct ltt_kernel_stream *stream; | |
602 | ||
0525e9ae DG |
603 | assert(channel); |
604 | ||
f3ed775e DG |
605 | DBG("Flush buffer for channel %s", channel->channel->name); |
606 | ||
607 | cds_list_for_each_entry(stream, &channel->stream_list.head, list) { | |
608 | DBG("Flushing channel stream %d", stream->fd); | |
609 | ret = kernctl_buffer_flush(stream->fd); | |
610 | if (ret < 0) { | |
df0f840b | 611 | PERROR("ioctl"); |
f3ed775e DG |
612 | ERR("Fail to flush buffer for stream %d (ret: %d)", |
613 | stream->fd, ret); | |
614 | } | |
615 | } | |
616 | ||
617 | return 0; | |
618 | } | |
619 | ||
8c0faa1d | 620 | /* |
050349bb | 621 | * Stop tracing session. |
8c0faa1d DG |
622 | */ |
623 | int kernel_stop_session(struct ltt_kernel_session *session) | |
624 | { | |
625 | int ret; | |
626 | ||
0525e9ae DG |
627 | assert(session); |
628 | ||
8c0faa1d DG |
629 | ret = kernctl_stop_session(session->fd); |
630 | if (ret < 0) { | |
631 | goto error; | |
632 | } | |
633 | ||
634 | DBG("Kernel session stopped"); | |
635 | ||
636 | return 0; | |
637 | ||
638 | error: | |
639 | return ret; | |
640 | } | |
641 | ||
642 | /* | |
050349bb DG |
643 | * Open stream of channel, register it to the kernel tracer and add it |
644 | * to the stream list of the channel. | |
8c0faa1d | 645 | * |
820aa965 MD |
646 | * Note: given that the streams may appear in random order wrt CPU |
647 | * number (e.g. cpu hotplug), the index value of the stream number in | |
648 | * the stream name is not necessarily linked to the CPU number. | |
649 | * | |
050349bb | 650 | * Return the number of created stream. Else, a negative value. |
8c0faa1d | 651 | */ |
f3ed775e | 652 | int kernel_open_channel_stream(struct ltt_kernel_channel *channel) |
8c0faa1d | 653 | { |
820aa965 | 654 | int ret; |
8c0faa1d DG |
655 | struct ltt_kernel_stream *lks; |
656 | ||
0525e9ae DG |
657 | assert(channel); |
658 | ||
5a47c6a2 | 659 | while ((ret = kernctl_create_stream(channel->fd)) >= 0) { |
820aa965 MD |
660 | lks = trace_kernel_create_stream(channel->channel->name, |
661 | channel->stream_count); | |
8c0faa1d | 662 | if (lks == NULL) { |
799e2c4f MD |
663 | ret = close(ret); |
664 | if (ret) { | |
665 | PERROR("close"); | |
666 | } | |
8c0faa1d DG |
667 | goto error; |
668 | } | |
669 | ||
670 | lks->fd = ret; | |
7b395890 DG |
671 | /* Prevent fd duplication after execlp() */ |
672 | ret = fcntl(lks->fd, F_SETFD, FD_CLOEXEC); | |
673 | if (ret < 0) { | |
df0f840b | 674 | PERROR("fcntl session fd"); |
7b395890 DG |
675 | } |
676 | ||
1624d5b7 JD |
677 | lks->tracefile_size = channel->channel->attr.tracefile_size; |
678 | lks->tracefile_count = channel->channel->attr.tracefile_count; | |
679 | ||
820aa965 | 680 | /* Add stream to channel stream list */ |
8c0faa1d DG |
681 | cds_list_add(&lks->list, &channel->stream_list.head); |
682 | channel->stream_count++; | |
8c0faa1d | 683 | |
00e2e675 DG |
684 | DBG("Kernel stream %s created (fd: %d, state: %d)", lks->name, lks->fd, |
685 | lks->state); | |
54012638 | 686 | } |
8c0faa1d DG |
687 | |
688 | return channel->stream_count; | |
689 | ||
690 | error: | |
54012638 | 691 | return -1; |
8c0faa1d DG |
692 | } |
693 | ||
694 | /* | |
050349bb | 695 | * Open the metadata stream and set it to the kernel session. |
8c0faa1d | 696 | */ |
f3ed775e | 697 | int kernel_open_metadata_stream(struct ltt_kernel_session *session) |
8c0faa1d DG |
698 | { |
699 | int ret; | |
700 | ||
0525e9ae DG |
701 | assert(session); |
702 | ||
8c0faa1d DG |
703 | ret = kernctl_create_stream(session->metadata->fd); |
704 | if (ret < 0) { | |
df0f840b | 705 | PERROR("kernel create metadata stream"); |
8c0faa1d DG |
706 | goto error; |
707 | } | |
708 | ||
709 | DBG("Kernel metadata stream created (fd: %d)", ret); | |
710 | session->metadata_stream_fd = ret; | |
7b395890 DG |
711 | /* Prevent fd duplication after execlp() */ |
712 | ret = fcntl(session->metadata_stream_fd, F_SETFD, FD_CLOEXEC); | |
713 | if (ret < 0) { | |
df0f840b | 714 | PERROR("fcntl session fd"); |
7b395890 | 715 | } |
aaf26714 DG |
716 | |
717 | return 0; | |
718 | ||
719 | error: | |
54012638 | 720 | return -1; |
aaf26714 | 721 | } |
2ef84c95 DG |
722 | |
723 | /* | |
9f19cc17 | 724 | * Get the event list from the kernel tracer and return the number of elements. |
2ef84c95 | 725 | */ |
9f19cc17 | 726 | ssize_t kernel_list_events(int tracer_fd, struct lttng_event **events) |
2ef84c95 | 727 | { |
53efb85a | 728 | int fd, ret; |
9f19cc17 DG |
729 | char *event; |
730 | size_t nbmem, count = 0; | |
2ef84c95 | 731 | FILE *fp; |
9f19cc17 | 732 | struct lttng_event *elist; |
2ef84c95 | 733 | |
0525e9ae DG |
734 | assert(events); |
735 | ||
2ef84c95 DG |
736 | fd = kernctl_tracepoint_list(tracer_fd); |
737 | if (fd < 0) { | |
df0f840b | 738 | PERROR("kernel tracepoint list"); |
2ef84c95 DG |
739 | goto error; |
740 | } | |
741 | ||
742 | fp = fdopen(fd, "r"); | |
743 | if (fp == NULL) { | |
df0f840b | 744 | PERROR("kernel tracepoint list fdopen"); |
61b73b12 | 745 | goto error_fp; |
2ef84c95 DG |
746 | } |
747 | ||
748 | /* | |
749 | * Init memory size counter | |
750 | * See kernel-ctl.h for explanation of this value | |
751 | */ | |
6725fe19 | 752 | nbmem = KERNEL_EVENT_INIT_LIST_SIZE; |
ba7f0ae5 | 753 | elist = zmalloc(sizeof(struct lttng_event) * nbmem); |
3b870559 MD |
754 | if (elist == NULL) { |
755 | PERROR("alloc list events"); | |
756 | count = -ENOMEM; | |
757 | goto end; | |
758 | } | |
2ef84c95 | 759 | |
53efb85a | 760 | while (fscanf(fp, "event { name = %m[^;]; };\n", &event) == 1) { |
6725fe19 | 761 | if (count >= nbmem) { |
3b870559 | 762 | struct lttng_event *new_elist; |
53efb85a | 763 | size_t new_nbmem; |
3b870559 | 764 | |
53efb85a MD |
765 | new_nbmem = nbmem << 1; |
766 | DBG("Reallocating event list from %zu to %zu bytes", | |
767 | nbmem, new_nbmem); | |
768 | new_elist = realloc(elist, new_nbmem * sizeof(struct lttng_event)); | |
3b870559 | 769 | if (new_elist == NULL) { |
df0f840b | 770 | PERROR("realloc list events"); |
3b870559 MD |
771 | free(event); |
772 | free(elist); | |
61b73b12 MD |
773 | count = -ENOMEM; |
774 | goto end; | |
2ef84c95 | 775 | } |
53efb85a MD |
776 | /* Zero the new memory */ |
777 | memset(new_elist + nbmem, 0, | |
778 | (new_nbmem - nbmem) * sizeof(struct lttng_event)); | |
779 | nbmem = new_nbmem; | |
3b870559 | 780 | elist = new_elist; |
2ef84c95 | 781 | } |
99497cd0 MD |
782 | strncpy(elist[count].name, event, LTTNG_SYMBOL_NAME_LEN); |
783 | elist[count].name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0'; | |
67b9d018 | 784 | elist[count].enabled = -1; |
9f19cc17 | 785 | count++; |
3b870559 | 786 | free(event); |
2ef84c95 DG |
787 | } |
788 | ||
9f19cc17 | 789 | *events = elist; |
ced2f820 | 790 | DBG("Kernel list events done (%zu events)", count); |
61b73b12 | 791 | end: |
799e2c4f MD |
792 | ret = fclose(fp); /* closes both fp and fd */ |
793 | if (ret) { | |
794 | PERROR("fclose"); | |
795 | } | |
9f19cc17 | 796 | return count; |
2ef84c95 | 797 | |
61b73b12 | 798 | error_fp: |
799e2c4f MD |
799 | ret = close(fd); |
800 | if (ret) { | |
801 | PERROR("close"); | |
802 | } | |
2ef84c95 DG |
803 | error: |
804 | return -1; | |
805 | } | |
096102bd DG |
806 | |
807 | /* | |
808 | * Get kernel version and validate it. | |
809 | */ | |
810 | int kernel_validate_version(int tracer_fd) | |
811 | { | |
812 | int ret; | |
813 | struct lttng_kernel_tracer_version version; | |
c052142c | 814 | struct lttng_kernel_tracer_abi_version abi_version; |
096102bd DG |
815 | |
816 | ret = kernctl_tracer_version(tracer_fd, &version); | |
817 | if (ret < 0) { | |
521dd134 | 818 | ERR("Failed to retrieve the lttng-modules version"); |
096102bd DG |
819 | goto error; |
820 | } | |
821 | ||
822 | /* Validate version */ | |
c052142c MD |
823 | if (version.major != VERSION_MAJOR) { |
824 | ERR("Kernel tracer major version (%d) is not compatible with lttng-tools major version (%d)", | |
825 | version.major, VERSION_MAJOR); | |
096102bd | 826 | goto error_version; |
096102bd | 827 | } |
c052142c MD |
828 | ret = kernctl_tracer_abi_version(tracer_fd, &abi_version); |
829 | if (ret < 0) { | |
521dd134 | 830 | ERR("Failed to retrieve lttng-modules ABI version"); |
c052142c MD |
831 | goto error; |
832 | } | |
833 | if (abi_version.major != LTTNG_MODULES_ABI_MAJOR_VERSION) { | |
521dd134 | 834 | ERR("Kernel tracer ABI version (%d.%d) does not match the expected ABI major version (%d.*)", |
c052142c MD |
835 | abi_version.major, abi_version.minor, |
836 | LTTNG_MODULES_ABI_MAJOR_VERSION); | |
837 | goto error; | |
838 | } | |
839 | DBG2("Kernel tracer version validated (%d.%d, ABI %d.%d)", | |
840 | version.major, version.minor, | |
841 | abi_version.major, abi_version.minor); | |
096102bd DG |
842 | return 0; |
843 | ||
844 | error_version: | |
096102bd DG |
845 | ret = -1; |
846 | ||
847 | error: | |
521dd134 | 848 | ERR("Kernel tracer version check failed; kernel tracing will not be available"); |
096102bd DG |
849 | return ret; |
850 | } | |
335a95b7 MD |
851 | |
852 | /* | |
853 | * Kernel work-arounds called at the start of sessiond main(). | |
854 | */ | |
855 | int init_kernel_workarounds(void) | |
856 | { | |
8936c33a | 857 | int ret; |
335a95b7 MD |
858 | FILE *fp; |
859 | ||
860 | /* | |
861 | * boot_id needs to be read once before being used concurrently | |
862 | * to deal with a Linux kernel race. A fix is proposed for | |
863 | * upstream, but the work-around is needed for older kernels. | |
864 | */ | |
865 | fp = fopen("/proc/sys/kernel/random/boot_id", "r"); | |
866 | if (!fp) { | |
867 | goto end_boot_id; | |
868 | } | |
869 | while (!feof(fp)) { | |
870 | char buf[37] = ""; | |
871 | ||
8936c33a DG |
872 | ret = fread(buf, 1, sizeof(buf), fp); |
873 | if (ret < 0) { | |
874 | /* Ignore error, we don't really care */ | |
875 | } | |
335a95b7 | 876 | } |
799e2c4f MD |
877 | ret = fclose(fp); |
878 | if (ret) { | |
879 | PERROR("fclose"); | |
880 | } | |
335a95b7 | 881 | end_boot_id: |
335a95b7 MD |
882 | return 0; |
883 | } | |
2f77fc4b DG |
884 | |
885 | /* | |
886 | * Complete teardown of a kernel session. | |
887 | */ | |
888 | void kernel_destroy_session(struct ltt_kernel_session *ksess) | |
889 | { | |
890 | if (ksess == NULL) { | |
891 | DBG3("No kernel session when tearing down session"); | |
892 | return; | |
893 | } | |
894 | ||
895 | DBG("Tearing down kernel session"); | |
896 | ||
07b86b52 | 897 | /* |
15dc512a DG |
898 | * Destroy channels on the consumer if at least one FD has been sent and we |
899 | * are in no output mode because the streams are in *no* monitor mode so we | |
900 | * have to send a command to clean them up or else they leaked. | |
07b86b52 | 901 | */ |
15dc512a | 902 | if (!ksess->output_traces && ksess->consumer_fds_sent) { |
07b86b52 JD |
903 | int ret; |
904 | struct consumer_socket *socket; | |
905 | struct lttng_ht_iter iter; | |
906 | ||
907 | /* For each consumer socket. */ | |
d069d577 | 908 | rcu_read_lock(); |
07b86b52 JD |
909 | cds_lfht_for_each_entry(ksess->consumer->socks->ht, &iter.iter, |
910 | socket, node.node) { | |
911 | struct ltt_kernel_channel *chan; | |
912 | ||
913 | /* For each channel, ask the consumer to destroy it. */ | |
914 | cds_list_for_each_entry(chan, &ksess->channel_list.head, list) { | |
915 | ret = kernel_consumer_destroy_channel(socket, chan); | |
916 | if (ret < 0) { | |
917 | /* Consumer is probably dead. Use next socket. */ | |
918 | continue; | |
919 | } | |
920 | } | |
921 | } | |
d069d577 | 922 | rcu_read_unlock(); |
07b86b52 JD |
923 | } |
924 | ||
2f77fc4b DG |
925 | /* Close any relayd session */ |
926 | consumer_output_send_destroy_relayd(ksess->consumer); | |
927 | ||
928 | trace_kernel_destroy_session(ksess); | |
929 | } | |
fb5f35b6 DG |
930 | |
931 | /* | |
932 | * Destroy a kernel channel object. It does not do anything on the tracer side. | |
933 | */ | |
934 | void kernel_destroy_channel(struct ltt_kernel_channel *kchan) | |
935 | { | |
936 | struct ltt_kernel_session *ksess = NULL; | |
937 | ||
938 | assert(kchan); | |
939 | assert(kchan->channel); | |
940 | ||
941 | DBG3("Kernel destroy channel %s", kchan->channel->name); | |
942 | ||
943 | /* Update channel count of associated session. */ | |
944 | if (kchan->session) { | |
945 | /* Keep pointer reference so we can update it after the destroy. */ | |
946 | ksess = kchan->session; | |
947 | } | |
948 | ||
949 | trace_kernel_destroy_channel(kchan); | |
950 | ||
951 | /* | |
952 | * At this point the kernel channel is not visible anymore. This is safe | |
953 | * since in order to work on a visible kernel session, the tracing session | |
954 | * lock (ltt_session.lock) MUST be acquired. | |
955 | */ | |
956 | if (ksess) { | |
957 | ksess->channel_count--; | |
958 | } | |
959 | } | |
6dc3064a DG |
960 | |
961 | /* | |
962 | * Take a snapshot for a given kernel session. | |
963 | * | |
2a06df8d | 964 | * Return 0 on success or else return a LTTNG_ERR code. |
6dc3064a DG |
965 | */ |
966 | int kernel_snapshot_record(struct ltt_kernel_session *ksess, | |
d07ceecd MD |
967 | struct snapshot_output *output, int wait, |
968 | uint64_t nb_packets_per_stream) | |
6dc3064a | 969 | { |
2a06df8d | 970 | int err, ret, saved_metadata_fd; |
6dc3064a DG |
971 | struct consumer_socket *socket; |
972 | struct lttng_ht_iter iter; | |
973 | struct ltt_kernel_metadata *saved_metadata; | |
974 | ||
975 | assert(ksess); | |
976 | assert(ksess->consumer); | |
977 | assert(output); | |
978 | ||
979 | DBG("Kernel snapshot record started"); | |
980 | ||
981 | /* Save current metadata since the following calls will change it. */ | |
982 | saved_metadata = ksess->metadata; | |
983 | saved_metadata_fd = ksess->metadata_stream_fd; | |
984 | ||
985 | rcu_read_lock(); | |
986 | ||
987 | ret = kernel_open_metadata(ksess); | |
988 | if (ret < 0) { | |
989 | ret = LTTNG_ERR_KERN_META_FAIL; | |
990 | goto error; | |
991 | } | |
992 | ||
993 | ret = kernel_open_metadata_stream(ksess); | |
994 | if (ret < 0) { | |
995 | ret = LTTNG_ERR_KERN_META_FAIL; | |
996 | goto error_open_stream; | |
997 | } | |
998 | ||
999 | /* Send metadata to consumer and snapshot everything. */ | |
1000 | cds_lfht_for_each_entry(ksess->consumer->socks->ht, &iter.iter, | |
1001 | socket, node.node) { | |
1002 | struct consumer_output *saved_output; | |
1003 | struct ltt_kernel_channel *chan; | |
6dc3064a DG |
1004 | |
1005 | /* | |
1006 | * Temporarly switch consumer output for our snapshot output. As long | |
1007 | * as the session lock is taken, this is safe. | |
1008 | */ | |
1009 | saved_output = ksess->consumer; | |
1010 | ksess->consumer = output->consumer; | |
1011 | ||
1012 | pthread_mutex_lock(socket->lock); | |
1013 | /* This stream must not be monitored by the consumer. */ | |
07b86b52 | 1014 | ret = kernel_consumer_add_metadata(socket, ksess, 0); |
6dc3064a | 1015 | pthread_mutex_unlock(socket->lock); |
07b86b52 | 1016 | /* Put back the saved consumer output into the session. */ |
6dc3064a DG |
1017 | ksess->consumer = saved_output; |
1018 | if (ret < 0) { | |
1019 | ret = LTTNG_ERR_KERN_CONSUMER_FAIL; | |
1020 | goto error_consumer; | |
1021 | } | |
1022 | ||
1023 | /* For each channel, ask the consumer to snapshot it. */ | |
1024 | cds_list_for_each_entry(chan, &ksess->channel_list.head, list) { | |
07b86b52 | 1025 | pthread_mutex_lock(socket->lock); |
6dc3064a | 1026 | ret = consumer_snapshot_channel(socket, chan->fd, output, 0, |
5c786ded JD |
1027 | ksess->uid, ksess->gid, |
1028 | DEFAULT_KERNEL_TRACE_DIR, wait, | |
d07ceecd | 1029 | nb_packets_per_stream); |
07b86b52 | 1030 | pthread_mutex_unlock(socket->lock); |
6dc3064a DG |
1031 | if (ret < 0) { |
1032 | ret = LTTNG_ERR_KERN_CONSUMER_FAIL; | |
2a06df8d DG |
1033 | (void) kernel_consumer_destroy_metadata(socket, |
1034 | ksess->metadata); | |
6dc3064a DG |
1035 | goto error_consumer; |
1036 | } | |
1037 | } | |
1038 | ||
1039 | /* Snapshot metadata, */ | |
07b86b52 | 1040 | pthread_mutex_lock(socket->lock); |
6dc3064a | 1041 | ret = consumer_snapshot_channel(socket, ksess->metadata->fd, output, |
5c786ded | 1042 | 1, ksess->uid, ksess->gid, |
d07ceecd | 1043 | DEFAULT_KERNEL_TRACE_DIR, wait, 0); |
07b86b52 | 1044 | pthread_mutex_unlock(socket->lock); |
6dc3064a DG |
1045 | if (ret < 0) { |
1046 | ret = LTTNG_ERR_KERN_CONSUMER_FAIL; | |
1047 | goto error_consumer; | |
1048 | } | |
07b86b52 JD |
1049 | |
1050 | /* | |
1051 | * The metadata snapshot is done, ask the consumer to destroy it since | |
1052 | * it's not monitored on the consumer side. | |
1053 | */ | |
1054 | (void) kernel_consumer_destroy_metadata(socket, ksess->metadata); | |
6dc3064a DG |
1055 | } |
1056 | ||
fac41e72 DG |
1057 | ret = LTTNG_OK; |
1058 | ||
6dc3064a DG |
1059 | error_consumer: |
1060 | /* Close newly opened metadata stream. It's now on the consumer side. */ | |
2a06df8d DG |
1061 | err = close(ksess->metadata_stream_fd); |
1062 | if (err < 0) { | |
6dc3064a DG |
1063 | PERROR("close snapshot kernel"); |
1064 | } | |
1065 | ||
1066 | error_open_stream: | |
1067 | trace_kernel_destroy_metadata(ksess->metadata); | |
1068 | error: | |
1069 | /* Restore metadata state.*/ | |
1070 | ksess->metadata = saved_metadata; | |
1071 | ksess->metadata_stream_fd = saved_metadata_fd; | |
1072 | ||
1073 | rcu_read_unlock(); | |
1074 | return ret; | |
1075 | } | |
834978fd DG |
1076 | |
1077 | /* | |
1078 | * Get the syscall mask array from the kernel tracer. | |
1079 | * | |
1080 | * Return 0 on success else a negative value. In both case, syscall_mask should | |
1081 | * be freed. | |
1082 | */ | |
1083 | int kernel_syscall_mask(int chan_fd, char **syscall_mask, uint32_t *nr_bits) | |
1084 | { | |
1085 | assert(syscall_mask); | |
1086 | assert(nr_bits); | |
1087 | ||
1088 | return kernctl_syscall_mask(chan_fd, syscall_mask, nr_bits); | |
1089 | } | |
883d8478 JR |
1090 | |
1091 | /* | |
1092 | * Check for the support of the RING_BUFFER_SNAPSHOT_SAMPLE_POSITIONS via abi | |
1093 | * version number. | |
1094 | * | |
1095 | * Return 1 on success, 0 when feature is not supported, negative value in case | |
1096 | * of errors. | |
1097 | */ | |
1098 | int kernel_supports_ring_buffer_snapshot_sample_positions(int tracer_fd) | |
1099 | { | |
1100 | int ret = 0; // Not supported by default | |
1101 | struct lttng_kernel_tracer_abi_version abi; | |
1102 | ||
1103 | ret = kernctl_tracer_abi_version(tracer_fd, &abi); | |
1104 | if (ret < 0) { | |
1105 | ERR("Failed to retrieve lttng-modules ABI version"); | |
1106 | goto error; | |
1107 | } | |
1108 | ||
1109 | /* | |
1110 | * RING_BUFFER_SNAPSHOT_SAMPLE_POSITIONS was introduced in 2.3 | |
1111 | */ | |
1112 | if (abi.major >= 2 && abi.minor >= 3) { | |
1113 | /* Supported */ | |
1114 | ret = 1; | |
1115 | } else { | |
1116 | /* Not supported */ | |
1117 | ret = 0; | |
1118 | } | |
1119 | error: | |
1120 | return ret; | |
1121 | } |