Commit | Line | Data |
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20fe2104 DG |
1 | /* |
2 | * Copyright (C) 2011 - David Goulet <david.goulet@polymtl.ca> | |
3 | * | |
4 | * This program is free software; you can redistribute it and/or | |
5 | * modify it under the terms of the GNU General Public License | |
6 | * as published by the Free Software Foundation; either version 2 | |
7 | * of the License, or (at your option) any later version. | |
8 | * | |
9 | * This program is distributed in the hope that it will be useful, | |
10 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
12 | * GNU General Public License for more details. | |
13 | * | |
14 | * You should have received a copy of the GNU General Public License | |
15 | * along with this program; if not, write to the Free Software | |
16 | * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. | |
17 | */ | |
18 | ||
8c0faa1d | 19 | #define _GNU_SOURCE |
20fe2104 | 20 | #include <errno.h> |
7b395890 | 21 | #include <fcntl.h> |
20fe2104 DG |
22 | #include <stdlib.h> |
23 | #include <stdio.h> | |
f34daff7 | 24 | #include <string.h> |
8c0faa1d | 25 | #include <unistd.h> |
20fe2104 | 26 | |
8c0faa1d | 27 | #include "lttngerr.h" |
20fe2104 DG |
28 | #include "ltt-sessiond.h" |
29 | #include "libkernelctl.h" | |
30 | #include "kernel-ctl.h" | |
20fe2104 DG |
31 | |
32 | /* | |
33 | * kernel_create_session | |
34 | * | |
54012638 DG |
35 | * Create a new kernel session, register it to the kernel tracer and add it to |
36 | * the session daemon session. | |
20fe2104 | 37 | */ |
8c0faa1d | 38 | int kernel_create_session(struct ltt_session *session, int tracer_fd) |
20fe2104 DG |
39 | { |
40 | int ret; | |
41 | struct ltt_kernel_session *lks; | |
42 | ||
54012638 DG |
43 | /* Allocate data structure */ |
44 | lks = trace_create_kernel_session(); | |
20fe2104 | 45 | if (lks == NULL) { |
54012638 | 46 | ret = -1; |
20fe2104 DG |
47 | goto error; |
48 | } | |
49 | ||
54012638 | 50 | /* Kernel tracer session creation */ |
20fe2104 DG |
51 | ret = kernctl_create_session(tracer_fd); |
52 | if (ret < 0) { | |
54012638 | 53 | perror("ioctl kernel create session"); |
20fe2104 DG |
54 | goto error; |
55 | } | |
56 | ||
20fe2104 | 57 | lks->fd = ret; |
7b395890 DG |
58 | /* Prevent fd duplication after execlp() */ |
59 | ret = fcntl(lks->fd, F_SETFD, FD_CLOEXEC); | |
60 | if (ret < 0) { | |
61 | perror("fcntl session fd"); | |
62 | } | |
63 | ||
f3ed775e | 64 | lks->kconsumer_fds_sent = 0; |
8c0faa1d DG |
65 | session->kernel_session = lks; |
66 | session->kern_session_count++; | |
8c0faa1d DG |
67 | |
68 | DBG("Kernel session created (fd: %d)", lks->fd); | |
20fe2104 DG |
69 | |
70 | return 0; | |
71 | ||
72 | error: | |
73 | return ret; | |
74 | } | |
75 | ||
76 | /* | |
77 | * kernel_create_channel | |
78 | * | |
54012638 DG |
79 | * Create a kernel channel, register it to the kernel tracer and add it to the |
80 | * kernel session. | |
20fe2104 | 81 | */ |
f3ed775e | 82 | int kernel_create_channel(struct ltt_kernel_session *session, struct lttng_channel *chan) |
20fe2104 DG |
83 | { |
84 | int ret; | |
85 | struct ltt_kernel_channel *lkc; | |
20fe2104 | 86 | |
54012638 | 87 | /* Allocate kernel channel */ |
f3ed775e | 88 | lkc = trace_create_kernel_channel(chan); |
54012638 | 89 | if (lkc == NULL) { |
20fe2104 DG |
90 | goto error; |
91 | } | |
92 | ||
54012638 | 93 | /* Kernel tracer channel creation */ |
f3ed775e | 94 | ret = kernctl_create_channel(session->fd, &lkc->channel->attr); |
20fe2104 | 95 | if (ret < 0) { |
54012638 | 96 | perror("ioctl kernel create channel"); |
20fe2104 DG |
97 | goto error; |
98 | } | |
99 | ||
54012638 | 100 | /* Setup the channel fd */ |
20fe2104 | 101 | lkc->fd = ret; |
7b395890 DG |
102 | /* Prevent fd duplication after execlp() */ |
103 | ret = fcntl(lkc->fd, F_SETFD, FD_CLOEXEC); | |
104 | if (ret < 0) { | |
105 | perror("fcntl session fd"); | |
106 | } | |
107 | ||
54012638 | 108 | /* Add channel to session */ |
8c0faa1d DG |
109 | cds_list_add(&lkc->list, &session->channel_list.head); |
110 | session->channel_count++; | |
20fe2104 | 111 | |
f3ed775e DG |
112 | DBG("Kernel channel %s created (fd: %d and path: %s)", |
113 | lkc->channel->name, lkc->fd, lkc->pathname); | |
20fe2104 DG |
114 | |
115 | return 0; | |
116 | ||
117 | error: | |
54012638 | 118 | return -1; |
20fe2104 | 119 | } |
f34daff7 DG |
120 | |
121 | /* | |
f3ed775e | 122 | * kernel_create_event |
f34daff7 | 123 | * |
54012638 DG |
124 | * Create a kernel event, enable it to the kernel tracer and add it to the |
125 | * channel event list of the kernel session. | |
f34daff7 | 126 | */ |
f3ed775e | 127 | int kernel_create_event(struct ltt_kernel_channel *channel, struct lttng_event *ev) |
f34daff7 DG |
128 | { |
129 | int ret; | |
130 | struct ltt_kernel_event *event; | |
f34daff7 | 131 | |
f3ed775e | 132 | event = trace_create_kernel_event(ev); |
54012638 | 133 | if (event == NULL) { |
f34daff7 DG |
134 | goto error; |
135 | } | |
136 | ||
f3ed775e DG |
137 | ret = kernctl_create_event(channel->fd, event->event); |
138 | if (ret < 0) { | |
e953ef25 DG |
139 | perror("create event ioctl"); |
140 | goto free_event; | |
8c0faa1d | 141 | } |
f34daff7 | 142 | |
f3ed775e | 143 | event->fd = ret; |
e953ef25 | 144 | event->enabled = 1; |
7b395890 DG |
145 | /* Prevent fd duplication after execlp() */ |
146 | ret = fcntl(event->fd, F_SETFD, FD_CLOEXEC); | |
147 | if (ret < 0) { | |
148 | perror("fcntl session fd"); | |
149 | } | |
150 | ||
f3ed775e DG |
151 | /* Add event to event list */ |
152 | cds_list_add(&event->list, &channel->events_list.head); | |
e953ef25 DG |
153 | DBG("Event %s created (fd: %d)", ev->name, event->fd); |
154 | ||
155 | return 0; | |
156 | ||
157 | free_event: | |
158 | free(event); | |
159 | error: | |
160 | return -1; | |
161 | } | |
162 | ||
163 | /* | |
164 | * kernel_disable_event | |
165 | * | |
166 | * Disable a kernel event for a specific channel. | |
167 | */ | |
168 | int kernel_disable_event(char *event_name, struct ltt_kernel_channel *channel) | |
169 | { | |
170 | int ret; | |
171 | struct ltt_kernel_event *iter; | |
172 | ||
173 | cds_list_for_each_entry(iter, &channel->events_list.head, list) { | |
174 | if (strcmp(iter->event->name, event_name) == 0) { | |
175 | ret = kernctl_disable(iter->fd); | |
176 | if (ret < 0) { | |
177 | perror("disable event ioctl"); | |
178 | goto error; | |
179 | } | |
180 | ||
181 | iter->enabled = 0; | |
182 | DBG("Kernel event %s disabled (fd: %d)", iter->event->name, iter->fd); | |
183 | break; | |
184 | } | |
185 | } | |
f3ed775e | 186 | |
f34daff7 DG |
187 | return 0; |
188 | ||
189 | error: | |
54012638 | 190 | return -1; |
f34daff7 | 191 | } |
aaf26714 DG |
192 | |
193 | /* | |
194 | * kernel_open_metadata | |
195 | * | |
54012638 DG |
196 | * Create kernel metadata, open from the kernel tracer and add it to the |
197 | * kernel session. | |
aaf26714 DG |
198 | */ |
199 | int kernel_open_metadata(struct ltt_kernel_session *session) | |
200 | { | |
201 | int ret; | |
202 | struct ltt_kernel_metadata *lkm; | |
aaf26714 | 203 | |
54012638 DG |
204 | /* Allocate kernel metadata */ |
205 | lkm = trace_create_kernel_metadata(); | |
206 | if (lkm == NULL) { | |
aaf26714 DG |
207 | goto error; |
208 | } | |
209 | ||
54012638 | 210 | /* Kernel tracer metadata creation */ |
f3ed775e | 211 | ret = kernctl_open_metadata(session->fd, &lkm->conf->attr); |
aaf26714 DG |
212 | if (ret < 0) { |
213 | goto error; | |
214 | } | |
215 | ||
8c0faa1d | 216 | lkm->fd = ret; |
7b395890 DG |
217 | /* Prevent fd duplication after execlp() */ |
218 | ret = fcntl(lkm->fd, F_SETFD, FD_CLOEXEC); | |
219 | if (ret < 0) { | |
220 | perror("fcntl session fd"); | |
221 | } | |
222 | ||
aaf26714 | 223 | session->metadata = lkm; |
8c0faa1d | 224 | |
54012638 | 225 | DBG("Kernel metadata opened (fd: %d and path: %s)", lkm->fd, lkm->pathname); |
8c0faa1d DG |
226 | |
227 | return 0; | |
228 | ||
229 | error: | |
54012638 | 230 | return -1; |
8c0faa1d DG |
231 | } |
232 | ||
233 | /* | |
234 | * kernel_start_session | |
235 | * | |
236 | * Start tracing session. | |
237 | */ | |
238 | int kernel_start_session(struct ltt_kernel_session *session) | |
239 | { | |
240 | int ret; | |
241 | ||
242 | ret = kernctl_start_session(session->fd); | |
243 | if (ret < 0) { | |
f3ed775e | 244 | perror("ioctl start session"); |
8c0faa1d DG |
245 | goto error; |
246 | } | |
247 | ||
248 | DBG("Kernel session started"); | |
249 | ||
250 | return 0; | |
251 | ||
252 | error: | |
253 | return ret; | |
254 | } | |
255 | ||
f3ed775e DG |
256 | /* |
257 | * kernel_wait_quiescent | |
258 | * | |
259 | * Make a kernel wait to make sure in-flight probe have completed. | |
260 | */ | |
261 | void kernel_wait_quiescent(int fd) | |
262 | { | |
263 | int ret; | |
264 | ||
265 | DBG("Kernel quiescent wait on %d", fd); | |
266 | ||
267 | ret = kernctl_wait_quiescent(fd); | |
268 | if (ret < 0) { | |
269 | perror("wait quiescent ioctl"); | |
270 | ERR("Kernel quiescent wait failed"); | |
271 | } | |
272 | } | |
273 | ||
274 | /* | |
275 | * kernel_metadata_flush_buffer | |
276 | * | |
277 | * Force flush buffer of metadata. | |
278 | */ | |
279 | int kernel_metadata_flush_buffer(int fd) | |
280 | { | |
281 | int ret; | |
282 | ||
283 | ret = kernctl_buffer_flush(fd); | |
284 | if (ret < 0) { | |
285 | ERR("Fail to flush metadata buffers %d (ret: %d", fd, ret); | |
286 | } | |
287 | ||
288 | return 0; | |
289 | } | |
290 | ||
291 | /* | |
292 | * kernel_flush_buffer | |
293 | * | |
294 | * Force flush buffer for channel. | |
295 | */ | |
296 | int kernel_flush_buffer(struct ltt_kernel_channel *channel) | |
297 | { | |
298 | int ret; | |
299 | struct ltt_kernel_stream *stream; | |
300 | ||
301 | DBG("Flush buffer for channel %s", channel->channel->name); | |
302 | ||
303 | cds_list_for_each_entry(stream, &channel->stream_list.head, list) { | |
304 | DBG("Flushing channel stream %d", stream->fd); | |
305 | ret = kernctl_buffer_flush(stream->fd); | |
306 | if (ret < 0) { | |
307 | perror("ioctl"); | |
308 | ERR("Fail to flush buffer for stream %d (ret: %d)", | |
309 | stream->fd, ret); | |
310 | } | |
311 | } | |
312 | ||
313 | return 0; | |
314 | } | |
315 | ||
8c0faa1d DG |
316 | /* |
317 | * kernel_stop_session | |
318 | * | |
319 | * Stop tracing session. | |
320 | */ | |
321 | int kernel_stop_session(struct ltt_kernel_session *session) | |
322 | { | |
323 | int ret; | |
324 | ||
325 | ret = kernctl_stop_session(session->fd); | |
326 | if (ret < 0) { | |
327 | goto error; | |
328 | } | |
329 | ||
330 | DBG("Kernel session stopped"); | |
331 | ||
332 | return 0; | |
333 | ||
334 | error: | |
335 | return ret; | |
336 | } | |
337 | ||
338 | /* | |
f3ed775e | 339 | * kernel_open_channel_stream |
8c0faa1d | 340 | * |
f3ed775e | 341 | * Open stream of channel, register it to the kernel tracer and add it |
54012638 | 342 | * to the stream list of the channel. |
8c0faa1d DG |
343 | * |
344 | * Return the number of created stream. Else, a negative value. | |
345 | */ | |
f3ed775e | 346 | int kernel_open_channel_stream(struct ltt_kernel_channel *channel) |
8c0faa1d DG |
347 | { |
348 | int ret; | |
349 | struct ltt_kernel_stream *lks; | |
350 | ||
351 | while ((ret = kernctl_create_stream(channel->fd)) > 0) { | |
54012638 | 352 | lks = trace_create_kernel_stream(); |
8c0faa1d | 353 | if (lks == NULL) { |
54012638 | 354 | close(ret); |
8c0faa1d DG |
355 | goto error; |
356 | } | |
357 | ||
358 | lks->fd = ret; | |
7b395890 DG |
359 | /* Prevent fd duplication after execlp() */ |
360 | ret = fcntl(lks->fd, F_SETFD, FD_CLOEXEC); | |
361 | if (ret < 0) { | |
362 | perror("fcntl session fd"); | |
363 | } | |
364 | ||
8c0faa1d DG |
365 | ret = asprintf(&lks->pathname, "%s/trace_%d", |
366 | channel->pathname, channel->stream_count); | |
367 | if (ret < 0) { | |
368 | perror("asprintf kernel create stream"); | |
369 | goto error; | |
370 | } | |
8c0faa1d | 371 | |
54012638 | 372 | /* Add stream to channe stream list */ |
8c0faa1d DG |
373 | cds_list_add(&lks->list, &channel->stream_list.head); |
374 | channel->stream_count++; | |
8c0faa1d | 375 | |
54012638 DG |
376 | DBG("Kernel stream %d created (fd: %d, state: %d, path: %s)", |
377 | channel->stream_count, lks->fd, lks->state, lks->pathname); | |
378 | } | |
8c0faa1d DG |
379 | |
380 | return channel->stream_count; | |
381 | ||
382 | error: | |
54012638 | 383 | return -1; |
8c0faa1d DG |
384 | } |
385 | ||
386 | /* | |
f3ed775e | 387 | * kernel_open_metadata_stream |
8c0faa1d | 388 | * |
f3ed775e | 389 | * Open the metadata stream and set it to the kernel session. |
8c0faa1d | 390 | */ |
f3ed775e | 391 | int kernel_open_metadata_stream(struct ltt_kernel_session *session) |
8c0faa1d DG |
392 | { |
393 | int ret; | |
394 | ||
395 | ret = kernctl_create_stream(session->metadata->fd); | |
396 | if (ret < 0) { | |
397 | perror("kernel create metadata stream"); | |
8c0faa1d DG |
398 | goto error; |
399 | } | |
400 | ||
401 | DBG("Kernel metadata stream created (fd: %d)", ret); | |
402 | session->metadata_stream_fd = ret; | |
7b395890 DG |
403 | /* Prevent fd duplication after execlp() */ |
404 | ret = fcntl(session->metadata_stream_fd, F_SETFD, FD_CLOEXEC); | |
405 | if (ret < 0) { | |
406 | perror("fcntl session fd"); | |
407 | } | |
aaf26714 DG |
408 | |
409 | return 0; | |
410 | ||
411 | error: | |
54012638 | 412 | return -1; |
aaf26714 | 413 | } |
2ef84c95 DG |
414 | |
415 | /* | |
416 | * kernel_list_events | |
417 | * | |
418 | * Get the event list from the kernel tracer and return that list in the CTF | |
419 | * format. | |
420 | */ | |
421 | ssize_t kernel_list_events(int tracer_fd, char **list) | |
422 | { | |
423 | int fd; | |
424 | char *buf, *line = NULL; | |
425 | size_t nb, nbmem, total = 0; | |
426 | ssize_t size; | |
427 | FILE *fp; | |
428 | ||
429 | fd = kernctl_tracepoint_list(tracer_fd); | |
430 | if (fd < 0) { | |
431 | perror("kernel tracepoint list"); | |
432 | goto error; | |
433 | } | |
434 | ||
435 | fp = fdopen(fd, "r"); | |
436 | if (fp == NULL) { | |
437 | perror("kernel tracepoint list fdopen"); | |
438 | goto error; | |
439 | } | |
440 | ||
441 | /* | |
442 | * Init memory size counter | |
443 | * See kernel-ctl.h for explanation of this value | |
444 | */ | |
445 | nbmem = KERNEL_EVENT_LIST_SIZE; | |
446 | buf = malloc(nbmem); | |
447 | ||
448 | while ((size = getline(&line, &nb, fp)) != -1) { | |
449 | if (total + size > nbmem) { | |
d686b40f | 450 | DBG("Reallocating event list from %zd to %zd bytes", nbmem, |
2ef84c95 DG |
451 | total + size + KERNEL_EVENT_LIST_SIZE); |
452 | /* Adding the default size again */ | |
453 | nbmem = total + size + KERNEL_EVENT_LIST_SIZE; | |
454 | buf = realloc(buf, nbmem); | |
455 | if (buf == NULL) { | |
456 | perror("realloc list events"); | |
457 | goto error; | |
458 | } | |
459 | } | |
460 | memcpy(buf + total, line, size); | |
461 | total += size; | |
462 | } | |
463 | ||
464 | *list = buf; | |
465 | ||
466 | DBG("Kernel list events done"); | |
467 | ||
468 | return total; | |
469 | ||
470 | error: | |
471 | return -1; | |
472 | } |