Commit | Line | Data |
---|---|---|
54012638 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. | |
54012638 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. | |
54012638 DG |
16 | */ |
17 | ||
18 | #define _GNU_SOURCE | |
19 | #include <stdio.h> | |
20 | #include <stdlib.h> | |
21 | #include <string.h> | |
c363b55d | 22 | #include <unistd.h> |
54012638 | 23 | |
990570ed DG |
24 | #include <common/common.h> |
25 | #include <common/defaults.h> | |
1e307fab | 26 | |
00e2e675 | 27 | #include "consumer.h" |
62499ad6 | 28 | #include "trace-kernel.h" |
54012638 | 29 | |
19e70852 | 30 | /* |
050349bb | 31 | * Find the channel name for the given kernel session. |
19e70852 | 32 | */ |
62499ad6 | 33 | struct ltt_kernel_channel *trace_kernel_get_channel_by_name( |
19e70852 DG |
34 | char *name, struct ltt_kernel_session *session) |
35 | { | |
36 | struct ltt_kernel_channel *chan; | |
37 | ||
0525e9ae DG |
38 | assert(session); |
39 | assert(name); | |
19e70852 | 40 | |
54d01ffb DG |
41 | DBG("Trying to find channel %s", name); |
42 | ||
19e70852 DG |
43 | cds_list_for_each_entry(chan, &session->channel_list.head, list) { |
44 | if (strcmp(name, chan->channel->name) == 0) { | |
45 | DBG("Found channel by name %s", name); | |
46 | return chan; | |
47 | } | |
48 | } | |
49 | ||
19e70852 DG |
50 | return NULL; |
51 | } | |
52 | ||
53 | /* | |
050349bb | 54 | * Find the event name for the given channel. |
19e70852 | 55 | */ |
62499ad6 | 56 | struct ltt_kernel_event *trace_kernel_get_event_by_name( |
19e70852 DG |
57 | char *name, struct ltt_kernel_channel *channel) |
58 | { | |
59 | struct ltt_kernel_event *ev; | |
60 | ||
0525e9ae DG |
61 | assert(name); |
62 | assert(channel); | |
19e70852 DG |
63 | |
64 | cds_list_for_each_entry(ev, &channel->events_list.head, list) { | |
65 | if (strcmp(name, ev->event->name) == 0) { | |
66 | DBG("Found event by name %s for channel %s", name, | |
67 | channel->channel->name); | |
68 | return ev; | |
69 | } | |
70 | } | |
71 | ||
19e70852 DG |
72 | return NULL; |
73 | } | |
74 | ||
54012638 | 75 | /* |
050349bb | 76 | * Allocate and initialize a kernel session data structure. |
54012638 | 77 | * |
050349bb | 78 | * Return pointer to structure or NULL. |
54012638 | 79 | */ |
f9815039 | 80 | struct ltt_kernel_session *trace_kernel_create_session(char *path) |
54012638 | 81 | { |
a4b92340 | 82 | struct ltt_kernel_session *lks = NULL; |
54012638 DG |
83 | |
84 | /* Allocate a new ltt kernel session */ | |
ba7f0ae5 | 85 | lks = zmalloc(sizeof(struct ltt_kernel_session)); |
54012638 | 86 | if (lks == NULL) { |
df0f840b | 87 | PERROR("create kernel session zmalloc"); |
a4b92340 | 88 | goto alloc_error; |
54012638 DG |
89 | } |
90 | ||
91 | /* Init data structure */ | |
03550b58 MD |
92 | lks->fd = -1; |
93 | lks->metadata_stream_fd = -1; | |
54012638 DG |
94 | lks->channel_count = 0; |
95 | lks->stream_count_global = 0; | |
96 | lks->metadata = NULL; | |
97 | CDS_INIT_LIST_HEAD(&lks->channel_list.head); | |
98 | ||
00e2e675 DG |
99 | lks->consumer = consumer_create_output(CONSUMER_DST_LOCAL); |
100 | if (lks->consumer == NULL) { | |
101 | goto error; | |
102 | } | |
103 | ||
104 | /* | |
105 | * The tmp_consumer stays NULL until a set_consumer_uri command is | |
106 | * executed. At this point, the consumer should be nullify until an | |
107 | * enable_consumer command. This assignment is symbolic since we've zmalloc | |
108 | * the struct. | |
109 | */ | |
110 | lks->tmp_consumer = NULL; | |
111 | ||
9d035200 | 112 | if (*path != '\0') { |
c617c0c6 MD |
113 | int ret; |
114 | ||
a4b92340 DG |
115 | /* Use the default consumer output which is the tracing session path. */ |
116 | ret = snprintf(lks->consumer->dst.trace_path, PATH_MAX, | |
117 | "%s" DEFAULT_KERNEL_TRACE_DIR, path); | |
118 | if (ret < 0) { | |
119 | PERROR("snprintf consumer trace path"); | |
120 | goto error; | |
121 | } | |
00e2e675 | 122 | |
a4b92340 DG |
123 | /* Set session path */ |
124 | ret = asprintf(&lks->trace_path, "%s" DEFAULT_KERNEL_TRACE_DIR, path); | |
125 | if (ret < 0) { | |
126 | PERROR("asprintf kernel traces path"); | |
127 | goto error; | |
128 | } | |
f9815039 DG |
129 | } |
130 | ||
54012638 DG |
131 | return lks; |
132 | ||
133 | error: | |
a4b92340 DG |
134 | free(lks); |
135 | ||
136 | alloc_error: | |
54012638 DG |
137 | return NULL; |
138 | } | |
139 | ||
140 | /* | |
050349bb | 141 | * Allocate and initialize a kernel channel data structure. |
54012638 | 142 | * |
050349bb | 143 | * Return pointer to structure or NULL. |
54012638 | 144 | */ |
00e2e675 | 145 | struct ltt_kernel_channel *trace_kernel_create_channel( |
fdd9eb17 | 146 | struct lttng_channel *chan) |
54012638 | 147 | { |
54012638 | 148 | struct ltt_kernel_channel *lkc; |
54012638 | 149 | |
0525e9ae DG |
150 | assert(chan); |
151 | ||
ba7f0ae5 | 152 | lkc = zmalloc(sizeof(struct ltt_kernel_channel)); |
f3ed775e | 153 | if (lkc == NULL) { |
df0f840b | 154 | PERROR("ltt_kernel_channel zmalloc"); |
54012638 DG |
155 | goto error; |
156 | } | |
157 | ||
ba7f0ae5 | 158 | lkc->channel = zmalloc(sizeof(struct lttng_channel)); |
f3ed775e | 159 | if (lkc->channel == NULL) { |
df0f840b | 160 | PERROR("lttng_channel zmalloc"); |
f3ed775e DG |
161 | goto error; |
162 | } | |
163 | memcpy(lkc->channel, chan, sizeof(struct lttng_channel)); | |
54012638 | 164 | |
03550b58 | 165 | lkc->fd = -1; |
54012638 | 166 | lkc->stream_count = 0; |
cbbbb275 | 167 | lkc->event_count = 0; |
d36b8583 | 168 | lkc->enabled = 1; |
e75cda3a | 169 | lkc->ctx = NULL; |
54012638 DG |
170 | /* Init linked list */ |
171 | CDS_INIT_LIST_HEAD(&lkc->events_list.head); | |
172 | CDS_INIT_LIST_HEAD(&lkc->stream_list.head); | |
54012638 DG |
173 | |
174 | return lkc; | |
175 | ||
176 | error: | |
177 | return NULL; | |
178 | } | |
179 | ||
180 | /* | |
050349bb | 181 | * Allocate and initialize a kernel event. Set name and event type. |
54012638 | 182 | * |
050349bb | 183 | * Return pointer to structure or NULL. |
54012638 | 184 | */ |
62499ad6 | 185 | struct ltt_kernel_event *trace_kernel_create_event(struct lttng_event *ev) |
54012638 DG |
186 | { |
187 | struct ltt_kernel_event *lke; | |
188 | struct lttng_kernel_event *attr; | |
189 | ||
0525e9ae DG |
190 | assert(ev); |
191 | ||
ba7f0ae5 DG |
192 | lke = zmalloc(sizeof(struct ltt_kernel_event)); |
193 | attr = zmalloc(sizeof(struct lttng_kernel_event)); | |
54012638 | 194 | if (lke == NULL || attr == NULL) { |
df0f840b | 195 | PERROR("kernel event zmalloc"); |
54012638 DG |
196 | goto error; |
197 | } | |
198 | ||
f3ed775e | 199 | switch (ev->type) { |
7d29a247 | 200 | case LTTNG_EVENT_PROBE: |
e6ddca71 | 201 | attr->instrumentation = LTTNG_KERNEL_KPROBE; |
7d29a247 DG |
202 | attr->u.kprobe.addr = ev->attr.probe.addr; |
203 | attr->u.kprobe.offset = ev->attr.probe.offset; | |
f3ed775e | 204 | strncpy(attr->u.kprobe.symbol_name, |
dbbb3ec5 DG |
205 | ev->attr.probe.symbol_name, LTTNG_KERNEL_SYM_NAME_LEN); |
206 | attr->u.kprobe.symbol_name[LTTNG_KERNEL_SYM_NAME_LEN - 1] = '\0'; | |
f3ed775e DG |
207 | break; |
208 | case LTTNG_EVENT_FUNCTION: | |
8f0d098b MD |
209 | attr->instrumentation = LTTNG_KERNEL_KRETPROBE; |
210 | attr->u.kretprobe.addr = ev->attr.probe.addr; | |
211 | attr->u.kretprobe.offset = ev->attr.probe.offset; | |
212 | attr->u.kretprobe.offset = ev->attr.probe.offset; | |
213 | strncpy(attr->u.kretprobe.symbol_name, | |
dbbb3ec5 DG |
214 | ev->attr.probe.symbol_name, LTTNG_KERNEL_SYM_NAME_LEN); |
215 | attr->u.kretprobe.symbol_name[LTTNG_KERNEL_SYM_NAME_LEN - 1] = '\0'; | |
8f0d098b MD |
216 | break; |
217 | case LTTNG_EVENT_FUNCTION_ENTRY: | |
f3ed775e DG |
218 | attr->instrumentation = LTTNG_KERNEL_FUNCTION; |
219 | strncpy(attr->u.ftrace.symbol_name, | |
dbbb3ec5 DG |
220 | ev->attr.ftrace.symbol_name, LTTNG_KERNEL_SYM_NAME_LEN); |
221 | attr->u.ftrace.symbol_name[LTTNG_KERNEL_SYM_NAME_LEN - 1] = '\0'; | |
f3ed775e | 222 | break; |
e6ddca71 DG |
223 | case LTTNG_EVENT_TRACEPOINT: |
224 | attr->instrumentation = LTTNG_KERNEL_TRACEPOINT; | |
f3ed775e | 225 | break; |
a54bd42d MD |
226 | case LTTNG_EVENT_SYSCALL: |
227 | attr->instrumentation = LTTNG_KERNEL_SYSCALL; | |
0133c199 | 228 | break; |
7a3d1328 MD |
229 | case LTTNG_EVENT_ALL: |
230 | attr->instrumentation = LTTNG_KERNEL_ALL; | |
231 | break; | |
f3ed775e DG |
232 | default: |
233 | ERR("Unknown kernel instrumentation type (%d)", ev->type); | |
234 | goto error; | |
235 | } | |
236 | ||
237 | /* Copy event name */ | |
dbbb3ec5 DG |
238 | strncpy(attr->name, ev->name, LTTNG_KERNEL_SYM_NAME_LEN); |
239 | attr->name[LTTNG_KERNEL_SYM_NAME_LEN - 1] = '\0'; | |
f3ed775e | 240 | |
54012638 | 241 | /* Setting up a kernel event */ |
03550b58 | 242 | lke->fd = -1; |
54012638 | 243 | lke->event = attr; |
d36b8583 | 244 | lke->enabled = 1; |
54012638 DG |
245 | |
246 | return lke; | |
247 | ||
248 | error: | |
a2c0da86 MD |
249 | free(lke); |
250 | free(attr); | |
54012638 DG |
251 | return NULL; |
252 | } | |
253 | ||
254 | /* | |
050349bb | 255 | * Allocate and initialize a kernel metadata. |
54012638 | 256 | * |
050349bb | 257 | * Return pointer to structure or NULL. |
54012638 | 258 | */ |
a4b92340 | 259 | struct ltt_kernel_metadata *trace_kernel_create_metadata(void) |
54012638 | 260 | { |
54012638 | 261 | struct ltt_kernel_metadata *lkm; |
f3ed775e | 262 | struct lttng_channel *chan; |
54012638 | 263 | |
ba7f0ae5 DG |
264 | lkm = zmalloc(sizeof(struct ltt_kernel_metadata)); |
265 | chan = zmalloc(sizeof(struct lttng_channel)); | |
f3ed775e | 266 | if (lkm == NULL || chan == NULL) { |
df0f840b | 267 | PERROR("kernel metadata zmalloc"); |
54012638 DG |
268 | goto error; |
269 | } | |
270 | ||
271 | /* Set default attributes */ | |
f3ed775e | 272 | chan->attr.overwrite = DEFAULT_CHANNEL_OVERWRITE; |
3e230f92 | 273 | chan->attr.subbuf_size = default_get_metadata_subbuf_size(); |
b389abbe | 274 | chan->attr.num_subbuf = DEFAULT_METADATA_SUBBUF_NUM; |
f3ed775e DG |
275 | chan->attr.switch_timer_interval = DEFAULT_CHANNEL_SWITCH_TIMER; |
276 | chan->attr.read_timer_interval = DEFAULT_CHANNEL_READ_TIMER; | |
7d452e12 | 277 | chan->attr.output = DEFAULT_KERNEL_CHANNEL_OUTPUT; |
54012638 DG |
278 | |
279 | /* Init metadata */ | |
03550b58 | 280 | lkm->fd = -1; |
f3ed775e | 281 | lkm->conf = chan; |
54012638 DG |
282 | |
283 | return lkm; | |
284 | ||
285 | error: | |
a2c0da86 MD |
286 | free(lkm); |
287 | free(chan); | |
54012638 DG |
288 | return NULL; |
289 | } | |
290 | ||
291 | /* | |
050349bb DG |
292 | * Allocate and initialize a kernel stream. The stream is set to ACTIVE_FD by |
293 | * default. | |
54012638 | 294 | * |
050349bb | 295 | * Return pointer to structure or NULL. |
54012638 | 296 | */ |
00e2e675 DG |
297 | struct ltt_kernel_stream *trace_kernel_create_stream(const char *name, |
298 | unsigned int count) | |
54012638 | 299 | { |
00e2e675 | 300 | int ret; |
54012638 DG |
301 | struct ltt_kernel_stream *lks; |
302 | ||
0525e9ae DG |
303 | assert(name); |
304 | ||
ba7f0ae5 | 305 | lks = zmalloc(sizeof(struct ltt_kernel_stream)); |
54012638 | 306 | if (lks == NULL) { |
df0f840b | 307 | PERROR("kernel stream zmalloc"); |
54012638 DG |
308 | goto error; |
309 | } | |
310 | ||
00e2e675 DG |
311 | /* Set name */ |
312 | ret = snprintf(lks->name, sizeof(lks->name), "%s_%d", name, count); | |
313 | if (ret < 0) { | |
314 | PERROR("snprintf stream name"); | |
315 | goto error; | |
316 | } | |
317 | lks->name[sizeof(lks->name) - 1] = '\0'; | |
318 | ||
54012638 | 319 | /* Init stream */ |
03550b58 | 320 | lks->fd = -1; |
54012638 DG |
321 | lks->state = 0; |
322 | ||
323 | return lks; | |
324 | ||
325 | error: | |
326 | return NULL; | |
327 | } | |
c363b55d | 328 | |
050349bb DG |
329 | /* |
330 | * Cleanup kernel stream structure. | |
331 | */ | |
62499ad6 | 332 | void trace_kernel_destroy_stream(struct ltt_kernel_stream *stream) |
c363b55d | 333 | { |
0525e9ae DG |
334 | assert(stream); |
335 | ||
33a2b854 | 336 | DBG("[trace] Closing stream fd %d", stream->fd); |
c363b55d | 337 | /* Close kernel fd */ |
03550b58 | 338 | if (stream->fd >= 0) { |
c617c0c6 MD |
339 | int ret; |
340 | ||
03550b58 MD |
341 | ret = close(stream->fd); |
342 | if (ret) { | |
343 | PERROR("close"); | |
344 | } | |
799e2c4f | 345 | } |
c363b55d DG |
346 | /* Remove from stream list */ |
347 | cds_list_del(&stream->list); | |
f9815039 | 348 | |
c363b55d DG |
349 | free(stream); |
350 | } | |
351 | ||
050349bb DG |
352 | /* |
353 | * Cleanup kernel event structure. | |
354 | */ | |
62499ad6 | 355 | void trace_kernel_destroy_event(struct ltt_kernel_event *event) |
c363b55d | 356 | { |
0525e9ae DG |
357 | assert(event); |
358 | ||
87eb4ab8 | 359 | if (event->fd >= 0) { |
c617c0c6 MD |
360 | int ret; |
361 | ||
87eb4ab8 MD |
362 | DBG("[trace] Closing event fd %d", event->fd); |
363 | /* Close kernel fd */ | |
799e2c4f MD |
364 | ret = close(event->fd); |
365 | if (ret) { | |
366 | PERROR("close"); | |
367 | } | |
87eb4ab8 MD |
368 | } else { |
369 | DBG("[trace] Tearing down event (no associated fd)"); | |
370 | } | |
c363b55d DG |
371 | |
372 | /* Remove from event list */ | |
373 | cds_list_del(&event->list); | |
f9815039 DG |
374 | |
375 | free(event->event); | |
c363b55d DG |
376 | free(event); |
377 | } | |
378 | ||
050349bb DG |
379 | /* |
380 | * Cleanup kernel channel structure. | |
381 | */ | |
62499ad6 | 382 | void trace_kernel_destroy_channel(struct ltt_kernel_channel *channel) |
c363b55d | 383 | { |
af9737e9 DG |
384 | struct ltt_kernel_stream *stream, *stmp; |
385 | struct ltt_kernel_event *event, *etmp; | |
799e2c4f | 386 | int ret; |
c363b55d | 387 | |
0525e9ae DG |
388 | assert(channel); |
389 | ||
33a2b854 | 390 | DBG("[trace] Closing channel fd %d", channel->fd); |
c363b55d | 391 | /* Close kernel fd */ |
03550b58 MD |
392 | if (channel->fd >= 0) { |
393 | ret = close(channel->fd); | |
394 | if (ret) { | |
395 | PERROR("close"); | |
396 | } | |
799e2c4f | 397 | } |
c363b55d DG |
398 | |
399 | /* For each stream in the channel list */ | |
af9737e9 | 400 | cds_list_for_each_entry_safe(stream, stmp, &channel->stream_list.head, list) { |
62499ad6 | 401 | trace_kernel_destroy_stream(stream); |
c363b55d DG |
402 | } |
403 | ||
404 | /* For each event in the channel list */ | |
af9737e9 | 405 | cds_list_for_each_entry_safe(event, etmp, &channel->events_list.head, list) { |
62499ad6 | 406 | trace_kernel_destroy_event(event); |
c363b55d DG |
407 | } |
408 | ||
409 | /* Remove from channel list */ | |
410 | cds_list_del(&channel->list); | |
f9815039 | 411 | |
f9815039 DG |
412 | free(channel->channel); |
413 | free(channel->ctx); | |
c363b55d DG |
414 | free(channel); |
415 | } | |
416 | ||
050349bb DG |
417 | /* |
418 | * Cleanup kernel metadata structure. | |
419 | */ | |
62499ad6 | 420 | void trace_kernel_destroy_metadata(struct ltt_kernel_metadata *metadata) |
c363b55d | 421 | { |
0525e9ae DG |
422 | assert(metadata); |
423 | ||
33a2b854 | 424 | DBG("[trace] Closing metadata fd %d", metadata->fd); |
c363b55d | 425 | /* Close kernel fd */ |
03550b58 | 426 | if (metadata->fd >= 0) { |
c617c0c6 MD |
427 | int ret; |
428 | ||
03550b58 MD |
429 | ret = close(metadata->fd); |
430 | if (ret) { | |
431 | PERROR("close"); | |
432 | } | |
799e2c4f | 433 | } |
c363b55d | 434 | |
f9815039 | 435 | free(metadata->conf); |
c363b55d DG |
436 | free(metadata); |
437 | } | |
438 | ||
050349bb | 439 | /* |
62499ad6 | 440 | * Cleanup kernel session structure |
050349bb | 441 | */ |
62499ad6 | 442 | void trace_kernel_destroy_session(struct ltt_kernel_session *session) |
c363b55d | 443 | { |
af9737e9 | 444 | struct ltt_kernel_channel *channel, *ctmp; |
799e2c4f | 445 | int ret; |
c363b55d | 446 | |
0525e9ae DG |
447 | assert(session); |
448 | ||
33a2b854 | 449 | DBG("[trace] Closing session fd %d", session->fd); |
c363b55d | 450 | /* Close kernel fds */ |
03550b58 MD |
451 | if (session->fd >= 0) { |
452 | ret = close(session->fd); | |
453 | if (ret) { | |
454 | PERROR("close"); | |
455 | } | |
799e2c4f | 456 | } |
f9815039 | 457 | |
03550b58 | 458 | if (session->metadata_stream_fd >= 0) { |
70dc1c34 | 459 | DBG("[trace] Closing metadata stream fd %d", session->metadata_stream_fd); |
799e2c4f MD |
460 | ret = close(session->metadata_stream_fd); |
461 | if (ret) { | |
462 | PERROR("close"); | |
463 | } | |
70dc1c34 | 464 | } |
c363b55d | 465 | |
d36b8583 | 466 | if (session->metadata != NULL) { |
62499ad6 | 467 | trace_kernel_destroy_metadata(session->metadata); |
d36b8583 | 468 | } |
c363b55d | 469 | |
af9737e9 | 470 | cds_list_for_each_entry_safe(channel, ctmp, &session->channel_list.head, list) { |
62499ad6 | 471 | trace_kernel_destroy_channel(channel); |
c363b55d DG |
472 | } |
473 | ||
00e2e675 DG |
474 | /* Wipe consumer output object */ |
475 | consumer_destroy_output(session->consumer); | |
476 | consumer_destroy_output(session->tmp_consumer); | |
477 | ||
f9815039 | 478 | free(session->trace_path); |
c363b55d DG |
479 | free(session); |
480 | } |