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) { | |
139 | ERR("Unable to enable event %s for channel %s", ev->name, channel->channel->name); | |
140 | goto error; | |
8c0faa1d | 141 | } |
f34daff7 | 142 | |
f3ed775e | 143 | event->fd = ret; |
7b395890 DG |
144 | /* Prevent fd duplication after execlp() */ |
145 | ret = fcntl(event->fd, F_SETFD, FD_CLOEXEC); | |
146 | if (ret < 0) { | |
147 | perror("fcntl session fd"); | |
148 | } | |
149 | ||
f3ed775e DG |
150 | /* Add event to event list */ |
151 | cds_list_add(&event->list, &channel->events_list.head); | |
152 | DBG("Event %s enabled (fd: %d)", ev->name, event->fd); | |
153 | ||
f34daff7 DG |
154 | return 0; |
155 | ||
156 | error: | |
54012638 | 157 | return -1; |
f34daff7 | 158 | } |
aaf26714 DG |
159 | |
160 | /* | |
161 | * kernel_open_metadata | |
162 | * | |
54012638 DG |
163 | * Create kernel metadata, open from the kernel tracer and add it to the |
164 | * kernel session. | |
aaf26714 DG |
165 | */ |
166 | int kernel_open_metadata(struct ltt_kernel_session *session) | |
167 | { | |
168 | int ret; | |
169 | struct ltt_kernel_metadata *lkm; | |
aaf26714 | 170 | |
54012638 DG |
171 | /* Allocate kernel metadata */ |
172 | lkm = trace_create_kernel_metadata(); | |
173 | if (lkm == NULL) { | |
aaf26714 DG |
174 | goto error; |
175 | } | |
176 | ||
54012638 | 177 | /* Kernel tracer metadata creation */ |
f3ed775e | 178 | ret = kernctl_open_metadata(session->fd, &lkm->conf->attr); |
aaf26714 DG |
179 | if (ret < 0) { |
180 | goto error; | |
181 | } | |
182 | ||
8c0faa1d | 183 | lkm->fd = ret; |
7b395890 DG |
184 | /* Prevent fd duplication after execlp() */ |
185 | ret = fcntl(lkm->fd, F_SETFD, FD_CLOEXEC); | |
186 | if (ret < 0) { | |
187 | perror("fcntl session fd"); | |
188 | } | |
189 | ||
aaf26714 | 190 | session->metadata = lkm; |
8c0faa1d | 191 | |
54012638 | 192 | DBG("Kernel metadata opened (fd: %d and path: %s)", lkm->fd, lkm->pathname); |
8c0faa1d DG |
193 | |
194 | return 0; | |
195 | ||
196 | error: | |
54012638 | 197 | return -1; |
8c0faa1d DG |
198 | } |
199 | ||
200 | /* | |
201 | * kernel_start_session | |
202 | * | |
203 | * Start tracing session. | |
204 | */ | |
205 | int kernel_start_session(struct ltt_kernel_session *session) | |
206 | { | |
207 | int ret; | |
208 | ||
209 | ret = kernctl_start_session(session->fd); | |
210 | if (ret < 0) { | |
f3ed775e | 211 | perror("ioctl start session"); |
8c0faa1d DG |
212 | goto error; |
213 | } | |
214 | ||
215 | DBG("Kernel session started"); | |
216 | ||
217 | return 0; | |
218 | ||
219 | error: | |
220 | return ret; | |
221 | } | |
222 | ||
f3ed775e DG |
223 | /* |
224 | * kernel_wait_quiescent | |
225 | * | |
226 | * Make a kernel wait to make sure in-flight probe have completed. | |
227 | */ | |
228 | void kernel_wait_quiescent(int fd) | |
229 | { | |
230 | int ret; | |
231 | ||
232 | DBG("Kernel quiescent wait on %d", fd); | |
233 | ||
234 | ret = kernctl_wait_quiescent(fd); | |
235 | if (ret < 0) { | |
236 | perror("wait quiescent ioctl"); | |
237 | ERR("Kernel quiescent wait failed"); | |
238 | } | |
239 | } | |
240 | ||
241 | /* | |
242 | * kernel_metadata_flush_buffer | |
243 | * | |
244 | * Force flush buffer of metadata. | |
245 | */ | |
246 | int kernel_metadata_flush_buffer(int fd) | |
247 | { | |
248 | int ret; | |
249 | ||
250 | ret = kernctl_buffer_flush(fd); | |
251 | if (ret < 0) { | |
252 | ERR("Fail to flush metadata buffers %d (ret: %d", fd, ret); | |
253 | } | |
254 | ||
255 | return 0; | |
256 | } | |
257 | ||
258 | /* | |
259 | * kernel_flush_buffer | |
260 | * | |
261 | * Force flush buffer for channel. | |
262 | */ | |
263 | int kernel_flush_buffer(struct ltt_kernel_channel *channel) | |
264 | { | |
265 | int ret; | |
266 | struct ltt_kernel_stream *stream; | |
267 | ||
268 | DBG("Flush buffer for channel %s", channel->channel->name); | |
269 | ||
270 | cds_list_for_each_entry(stream, &channel->stream_list.head, list) { | |
271 | DBG("Flushing channel stream %d", stream->fd); | |
272 | ret = kernctl_buffer_flush(stream->fd); | |
273 | if (ret < 0) { | |
274 | perror("ioctl"); | |
275 | ERR("Fail to flush buffer for stream %d (ret: %d)", | |
276 | stream->fd, ret); | |
277 | } | |
278 | } | |
279 | ||
280 | return 0; | |
281 | } | |
282 | ||
8c0faa1d DG |
283 | /* |
284 | * kernel_stop_session | |
285 | * | |
286 | * Stop tracing session. | |
287 | */ | |
288 | int kernel_stop_session(struct ltt_kernel_session *session) | |
289 | { | |
290 | int ret; | |
291 | ||
292 | ret = kernctl_stop_session(session->fd); | |
293 | if (ret < 0) { | |
294 | goto error; | |
295 | } | |
296 | ||
297 | DBG("Kernel session stopped"); | |
298 | ||
299 | return 0; | |
300 | ||
301 | error: | |
302 | return ret; | |
303 | } | |
304 | ||
305 | /* | |
f3ed775e | 306 | * kernel_open_channel_stream |
8c0faa1d | 307 | * |
f3ed775e | 308 | * Open stream of channel, register it to the kernel tracer and add it |
54012638 | 309 | * to the stream list of the channel. |
8c0faa1d DG |
310 | * |
311 | * Return the number of created stream. Else, a negative value. | |
312 | */ | |
f3ed775e | 313 | int kernel_open_channel_stream(struct ltt_kernel_channel *channel) |
8c0faa1d DG |
314 | { |
315 | int ret; | |
316 | struct ltt_kernel_stream *lks; | |
317 | ||
318 | while ((ret = kernctl_create_stream(channel->fd)) > 0) { | |
54012638 | 319 | lks = trace_create_kernel_stream(); |
8c0faa1d | 320 | if (lks == NULL) { |
54012638 | 321 | close(ret); |
8c0faa1d DG |
322 | goto error; |
323 | } | |
324 | ||
325 | lks->fd = ret; | |
7b395890 DG |
326 | /* Prevent fd duplication after execlp() */ |
327 | ret = fcntl(lks->fd, F_SETFD, FD_CLOEXEC); | |
328 | if (ret < 0) { | |
329 | perror("fcntl session fd"); | |
330 | } | |
331 | ||
8c0faa1d DG |
332 | ret = asprintf(&lks->pathname, "%s/trace_%d", |
333 | channel->pathname, channel->stream_count); | |
334 | if (ret < 0) { | |
335 | perror("asprintf kernel create stream"); | |
336 | goto error; | |
337 | } | |
8c0faa1d | 338 | |
54012638 | 339 | /* Add stream to channe stream list */ |
8c0faa1d DG |
340 | cds_list_add(&lks->list, &channel->stream_list.head); |
341 | channel->stream_count++; | |
8c0faa1d | 342 | |
54012638 DG |
343 | DBG("Kernel stream %d created (fd: %d, state: %d, path: %s)", |
344 | channel->stream_count, lks->fd, lks->state, lks->pathname); | |
345 | } | |
8c0faa1d DG |
346 | |
347 | return channel->stream_count; | |
348 | ||
349 | error: | |
54012638 | 350 | return -1; |
8c0faa1d DG |
351 | } |
352 | ||
353 | /* | |
f3ed775e | 354 | * kernel_open_metadata_stream |
8c0faa1d | 355 | * |
f3ed775e | 356 | * Open the metadata stream and set it to the kernel session. |
8c0faa1d | 357 | */ |
f3ed775e | 358 | int kernel_open_metadata_stream(struct ltt_kernel_session *session) |
8c0faa1d DG |
359 | { |
360 | int ret; | |
361 | ||
362 | ret = kernctl_create_stream(session->metadata->fd); | |
363 | if (ret < 0) { | |
364 | perror("kernel create metadata stream"); | |
8c0faa1d DG |
365 | goto error; |
366 | } | |
367 | ||
368 | DBG("Kernel metadata stream created (fd: %d)", ret); | |
369 | session->metadata_stream_fd = ret; | |
7b395890 DG |
370 | /* Prevent fd duplication after execlp() */ |
371 | ret = fcntl(session->metadata_stream_fd, F_SETFD, FD_CLOEXEC); | |
372 | if (ret < 0) { | |
373 | perror("fcntl session fd"); | |
374 | } | |
aaf26714 DG |
375 | |
376 | return 0; | |
377 | ||
378 | error: | |
54012638 | 379 | return -1; |
aaf26714 | 380 | } |
2ef84c95 DG |
381 | |
382 | /* | |
383 | * kernel_list_events | |
384 | * | |
385 | * Get the event list from the kernel tracer and return that list in the CTF | |
386 | * format. | |
387 | */ | |
388 | ssize_t kernel_list_events(int tracer_fd, char **list) | |
389 | { | |
390 | int fd; | |
391 | char *buf, *line = NULL; | |
392 | size_t nb, nbmem, total = 0; | |
393 | ssize_t size; | |
394 | FILE *fp; | |
395 | ||
396 | fd = kernctl_tracepoint_list(tracer_fd); | |
397 | if (fd < 0) { | |
398 | perror("kernel tracepoint list"); | |
399 | goto error; | |
400 | } | |
401 | ||
402 | fp = fdopen(fd, "r"); | |
403 | if (fp == NULL) { | |
404 | perror("kernel tracepoint list fdopen"); | |
405 | goto error; | |
406 | } | |
407 | ||
408 | /* | |
409 | * Init memory size counter | |
410 | * See kernel-ctl.h for explanation of this value | |
411 | */ | |
412 | nbmem = KERNEL_EVENT_LIST_SIZE; | |
413 | buf = malloc(nbmem); | |
414 | ||
415 | while ((size = getline(&line, &nb, fp)) != -1) { | |
416 | if (total + size > nbmem) { | |
d686b40f | 417 | DBG("Reallocating event list from %zd to %zd bytes", nbmem, |
2ef84c95 DG |
418 | total + size + KERNEL_EVENT_LIST_SIZE); |
419 | /* Adding the default size again */ | |
420 | nbmem = total + size + KERNEL_EVENT_LIST_SIZE; | |
421 | buf = realloc(buf, nbmem); | |
422 | if (buf == NULL) { | |
423 | perror("realloc list events"); | |
424 | goto error; | |
425 | } | |
426 | } | |
427 | memcpy(buf + total, line, size); | |
428 | total += size; | |
429 | } | |
430 | ||
431 | *list = buf; | |
432 | ||
433 | DBG("Kernel list events done"); | |
434 | ||
435 | return total; | |
436 | ||
437 | error: | |
438 | return -1; | |
439 | } |