Commit | Line | Data |
---|---|---|
54012638 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 | |
82a3637f DG |
6 | * as published by the Free Software Foundation; only version 2 |
7 | * of the License. | |
54012638 DG |
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 | ||
19 | #define _GNU_SOURCE | |
20 | #include <stdio.h> | |
21 | #include <stdlib.h> | |
22 | #include <string.h> | |
c363b55d | 23 | #include <unistd.h> |
54012638 | 24 | |
1e307fab DG |
25 | #include <lttngerr.h> |
26 | ||
62499ad6 | 27 | #include "trace-kernel.h" |
54012638 | 28 | |
19e70852 | 29 | /* |
050349bb | 30 | * Find the channel name for the given kernel session. |
19e70852 | 31 | */ |
62499ad6 | 32 | struct ltt_kernel_channel *trace_kernel_get_channel_by_name( |
19e70852 DG |
33 | char *name, struct ltt_kernel_session *session) |
34 | { | |
35 | struct ltt_kernel_channel *chan; | |
36 | ||
37 | if (session == NULL) { | |
38 | ERR("Undefine session"); | |
39 | goto error; | |
40 | } | |
41 | ||
54d01ffb DG |
42 | DBG("Trying to find channel %s", name); |
43 | ||
19e70852 DG |
44 | cds_list_for_each_entry(chan, &session->channel_list.head, list) { |
45 | if (strcmp(name, chan->channel->name) == 0) { | |
46 | DBG("Found channel by name %s", name); | |
47 | return chan; | |
48 | } | |
49 | } | |
50 | ||
51 | error: | |
52 | return NULL; | |
53 | } | |
54 | ||
55 | /* | |
050349bb | 56 | * Find the event name for the given channel. |
19e70852 | 57 | */ |
62499ad6 | 58 | struct ltt_kernel_event *trace_kernel_get_event_by_name( |
19e70852 DG |
59 | char *name, struct ltt_kernel_channel *channel) |
60 | { | |
61 | struct ltt_kernel_event *ev; | |
62 | ||
63 | if (channel == NULL) { | |
64 | ERR("Undefine channel"); | |
65 | goto error; | |
66 | } | |
67 | ||
68 | cds_list_for_each_entry(ev, &channel->events_list.head, list) { | |
69 | if (strcmp(name, ev->event->name) == 0) { | |
70 | DBG("Found event by name %s for channel %s", name, | |
71 | channel->channel->name); | |
72 | return ev; | |
73 | } | |
74 | } | |
75 | ||
76 | error: | |
77 | return NULL; | |
78 | } | |
79 | ||
54012638 | 80 | /* |
050349bb | 81 | * Allocate and initialize a kernel session data structure. |
54012638 | 82 | * |
050349bb | 83 | * Return pointer to structure or NULL. |
54012638 | 84 | */ |
f9815039 | 85 | struct ltt_kernel_session *trace_kernel_create_session(char *path) |
54012638 | 86 | { |
f9815039 | 87 | int ret; |
54012638 DG |
88 | struct ltt_kernel_session *lks; |
89 | ||
90 | /* Allocate a new ltt kernel session */ | |
ba7f0ae5 | 91 | lks = zmalloc(sizeof(struct ltt_kernel_session)); |
54012638 | 92 | if (lks == NULL) { |
ba7f0ae5 | 93 | perror("create kernel session zmalloc"); |
54012638 DG |
94 | goto error; |
95 | } | |
96 | ||
97 | /* Init data structure */ | |
98 | lks->fd = 0; | |
99 | lks->metadata_stream_fd = 0; | |
100 | lks->channel_count = 0; | |
101 | lks->stream_count_global = 0; | |
102 | lks->metadata = NULL; | |
d9800920 | 103 | lks->consumer_fd = 0; |
54012638 DG |
104 | CDS_INIT_LIST_HEAD(&lks->channel_list.head); |
105 | ||
f9815039 DG |
106 | /* Set session path */ |
107 | ret = asprintf(&lks->trace_path, "%s/kernel", path); | |
108 | if (ret < 0) { | |
109 | perror("asprintf kernel traces path"); | |
110 | goto error; | |
111 | } | |
112 | ||
54012638 DG |
113 | return lks; |
114 | ||
115 | error: | |
116 | return NULL; | |
117 | } | |
118 | ||
119 | /* | |
050349bb | 120 | * Allocate and initialize a kernel channel data structure. |
54012638 | 121 | * |
050349bb | 122 | * Return pointer to structure or NULL. |
54012638 | 123 | */ |
62499ad6 | 124 | struct ltt_kernel_channel *trace_kernel_create_channel(struct lttng_channel *chan, char *path) |
54012638 DG |
125 | { |
126 | int ret; | |
127 | struct ltt_kernel_channel *lkc; | |
54012638 | 128 | |
ba7f0ae5 | 129 | lkc = zmalloc(sizeof(struct ltt_kernel_channel)); |
f3ed775e | 130 | if (lkc == NULL) { |
ba7f0ae5 | 131 | perror("ltt_kernel_channel zmalloc"); |
54012638 DG |
132 | goto error; |
133 | } | |
134 | ||
ba7f0ae5 | 135 | lkc->channel = zmalloc(sizeof(struct lttng_channel)); |
f3ed775e | 136 | if (lkc->channel == NULL) { |
ba7f0ae5 | 137 | perror("lttng_channel zmalloc"); |
f3ed775e DG |
138 | goto error; |
139 | } | |
140 | memcpy(lkc->channel, chan, sizeof(struct lttng_channel)); | |
54012638 DG |
141 | |
142 | lkc->fd = 0; | |
143 | lkc->stream_count = 0; | |
cbbbb275 | 144 | lkc->event_count = 0; |
d36b8583 | 145 | lkc->enabled = 1; |
e75cda3a | 146 | lkc->ctx = NULL; |
54012638 DG |
147 | /* Init linked list */ |
148 | CDS_INIT_LIST_HEAD(&lkc->events_list.head); | |
149 | CDS_INIT_LIST_HEAD(&lkc->stream_list.head); | |
150 | /* Set default trace output path */ | |
b082db07 | 151 | ret = asprintf(&lkc->pathname, "%s", path); |
54012638 DG |
152 | if (ret < 0) { |
153 | perror("asprintf kernel create channel"); | |
154 | goto error; | |
155 | } | |
156 | ||
157 | return lkc; | |
158 | ||
159 | error: | |
160 | return NULL; | |
161 | } | |
162 | ||
163 | /* | |
050349bb | 164 | * Allocate and initialize a kernel event. Set name and event type. |
54012638 | 165 | * |
050349bb | 166 | * Return pointer to structure or NULL. |
54012638 | 167 | */ |
62499ad6 | 168 | struct ltt_kernel_event *trace_kernel_create_event(struct lttng_event *ev) |
54012638 DG |
169 | { |
170 | struct ltt_kernel_event *lke; | |
171 | struct lttng_kernel_event *attr; | |
172 | ||
ba7f0ae5 DG |
173 | lke = zmalloc(sizeof(struct ltt_kernel_event)); |
174 | attr = zmalloc(sizeof(struct lttng_kernel_event)); | |
54012638 | 175 | if (lke == NULL || attr == NULL) { |
ba7f0ae5 | 176 | perror("kernel event zmalloc"); |
54012638 DG |
177 | goto error; |
178 | } | |
179 | ||
f3ed775e | 180 | switch (ev->type) { |
7d29a247 | 181 | case LTTNG_EVENT_PROBE: |
e6ddca71 | 182 | attr->instrumentation = LTTNG_KERNEL_KPROBE; |
7d29a247 DG |
183 | attr->u.kprobe.addr = ev->attr.probe.addr; |
184 | attr->u.kprobe.offset = ev->attr.probe.offset; | |
f3ed775e | 185 | strncpy(attr->u.kprobe.symbol_name, |
7d29a247 | 186 | ev->attr.probe.symbol_name, LTTNG_SYM_NAME_LEN); |
99497cd0 | 187 | attr->u.kprobe.symbol_name[LTTNG_SYM_NAME_LEN - 1] = '\0'; |
f3ed775e DG |
188 | break; |
189 | case LTTNG_EVENT_FUNCTION: | |
8f0d098b MD |
190 | attr->instrumentation = LTTNG_KERNEL_KRETPROBE; |
191 | attr->u.kretprobe.addr = ev->attr.probe.addr; | |
192 | attr->u.kretprobe.offset = ev->attr.probe.offset; | |
193 | attr->u.kretprobe.offset = ev->attr.probe.offset; | |
194 | strncpy(attr->u.kretprobe.symbol_name, | |
195 | ev->attr.probe.symbol_name, LTTNG_SYM_NAME_LEN); | |
99497cd0 | 196 | attr->u.kretprobe.symbol_name[LTTNG_SYM_NAME_LEN - 1] = '\0'; |
8f0d098b MD |
197 | break; |
198 | case LTTNG_EVENT_FUNCTION_ENTRY: | |
f3ed775e DG |
199 | attr->instrumentation = LTTNG_KERNEL_FUNCTION; |
200 | strncpy(attr->u.ftrace.symbol_name, | |
201 | ev->attr.ftrace.symbol_name, LTTNG_SYM_NAME_LEN); | |
99497cd0 | 202 | attr->u.ftrace.symbol_name[LTTNG_SYM_NAME_LEN - 1] = '\0'; |
f3ed775e | 203 | break; |
e6ddca71 DG |
204 | case LTTNG_EVENT_TRACEPOINT: |
205 | attr->instrumentation = LTTNG_KERNEL_TRACEPOINT; | |
f3ed775e | 206 | break; |
a54bd42d MD |
207 | case LTTNG_EVENT_SYSCALL: |
208 | attr->instrumentation = LTTNG_KERNEL_SYSCALL; | |
0133c199 | 209 | break; |
7a3d1328 MD |
210 | case LTTNG_EVENT_ALL: |
211 | attr->instrumentation = LTTNG_KERNEL_ALL; | |
212 | break; | |
f3ed775e DG |
213 | default: |
214 | ERR("Unknown kernel instrumentation type (%d)", ev->type); | |
215 | goto error; | |
216 | } | |
217 | ||
218 | /* Copy event name */ | |
219 | strncpy(attr->name, ev->name, LTTNG_SYM_NAME_LEN); | |
99497cd0 | 220 | attr->name[LTTNG_SYM_NAME_LEN - 1] = '\0'; |
f3ed775e | 221 | |
54012638 DG |
222 | /* Setting up a kernel event */ |
223 | lke->fd = 0; | |
224 | lke->event = attr; | |
d36b8583 | 225 | lke->enabled = 1; |
e75cda3a | 226 | lke->ctx = NULL; |
54012638 DG |
227 | |
228 | return lke; | |
229 | ||
230 | error: | |
231 | return NULL; | |
232 | } | |
233 | ||
234 | /* | |
050349bb | 235 | * Allocate and initialize a kernel metadata. |
54012638 | 236 | * |
050349bb | 237 | * Return pointer to structure or NULL. |
54012638 | 238 | */ |
62499ad6 | 239 | struct ltt_kernel_metadata *trace_kernel_create_metadata(char *path) |
54012638 DG |
240 | { |
241 | int ret; | |
242 | struct ltt_kernel_metadata *lkm; | |
f3ed775e | 243 | struct lttng_channel *chan; |
54012638 | 244 | |
ba7f0ae5 DG |
245 | lkm = zmalloc(sizeof(struct ltt_kernel_metadata)); |
246 | chan = zmalloc(sizeof(struct lttng_channel)); | |
f3ed775e | 247 | if (lkm == NULL || chan == NULL) { |
ba7f0ae5 | 248 | perror("kernel metadata zmalloc"); |
54012638 DG |
249 | goto error; |
250 | } | |
251 | ||
252 | /* Set default attributes */ | |
f3ed775e | 253 | chan->attr.overwrite = DEFAULT_CHANNEL_OVERWRITE; |
b389abbe MD |
254 | chan->attr.subbuf_size = DEFAULT_METADATA_SUBBUF_SIZE; |
255 | chan->attr.num_subbuf = DEFAULT_METADATA_SUBBUF_NUM; | |
f3ed775e DG |
256 | chan->attr.switch_timer_interval = DEFAULT_CHANNEL_SWITCH_TIMER; |
257 | chan->attr.read_timer_interval = DEFAULT_CHANNEL_READ_TIMER; | |
7d452e12 | 258 | chan->attr.output = DEFAULT_KERNEL_CHANNEL_OUTPUT; |
54012638 DG |
259 | |
260 | /* Init metadata */ | |
261 | lkm->fd = 0; | |
f3ed775e | 262 | lkm->conf = chan; |
54012638 | 263 | /* Set default metadata path */ |
58a97671 | 264 | ret = asprintf(&lkm->pathname, "%s/metadata", path); |
54012638 DG |
265 | if (ret < 0) { |
266 | perror("asprintf kernel metadata"); | |
267 | goto error; | |
268 | } | |
269 | ||
270 | return lkm; | |
271 | ||
272 | error: | |
273 | return NULL; | |
274 | } | |
275 | ||
276 | /* | |
050349bb DG |
277 | * Allocate and initialize a kernel stream. The stream is set to ACTIVE_FD by |
278 | * default. | |
54012638 | 279 | * |
050349bb | 280 | * Return pointer to structure or NULL. |
54012638 | 281 | */ |
62499ad6 | 282 | struct ltt_kernel_stream *trace_kernel_create_stream(void) |
54012638 DG |
283 | { |
284 | struct ltt_kernel_stream *lks; | |
285 | ||
ba7f0ae5 | 286 | lks = zmalloc(sizeof(struct ltt_kernel_stream)); |
54012638 | 287 | if (lks == NULL) { |
ba7f0ae5 | 288 | perror("kernel stream zmalloc"); |
54012638 DG |
289 | goto error; |
290 | } | |
291 | ||
292 | /* Init stream */ | |
293 | lks->fd = 0; | |
294 | lks->pathname = NULL; | |
295 | lks->state = 0; | |
296 | ||
297 | return lks; | |
298 | ||
299 | error: | |
300 | return NULL; | |
301 | } | |
c363b55d | 302 | |
050349bb DG |
303 | /* |
304 | * Cleanup kernel stream structure. | |
305 | */ | |
62499ad6 | 306 | void trace_kernel_destroy_stream(struct ltt_kernel_stream *stream) |
c363b55d | 307 | { |
33a2b854 | 308 | DBG("[trace] Closing stream fd %d", stream->fd); |
c363b55d DG |
309 | /* Close kernel fd */ |
310 | close(stream->fd); | |
c363b55d DG |
311 | /* Remove from stream list */ |
312 | cds_list_del(&stream->list); | |
f9815039 DG |
313 | |
314 | free(stream->pathname); | |
c363b55d DG |
315 | free(stream); |
316 | } | |
317 | ||
050349bb DG |
318 | /* |
319 | * Cleanup kernel event structure. | |
320 | */ | |
62499ad6 | 321 | void trace_kernel_destroy_event(struct ltt_kernel_event *event) |
c363b55d | 322 | { |
33a2b854 | 323 | DBG("[trace] Closing event fd %d", event->fd); |
c363b55d DG |
324 | /* Close kernel fd */ |
325 | close(event->fd); | |
c363b55d DG |
326 | |
327 | /* Remove from event list */ | |
328 | cds_list_del(&event->list); | |
f9815039 DG |
329 | |
330 | free(event->event); | |
331 | free(event->ctx); | |
c363b55d DG |
332 | free(event); |
333 | } | |
334 | ||
050349bb DG |
335 | /* |
336 | * Cleanup kernel channel structure. | |
337 | */ | |
62499ad6 | 338 | void trace_kernel_destroy_channel(struct ltt_kernel_channel *channel) |
c363b55d | 339 | { |
af9737e9 DG |
340 | struct ltt_kernel_stream *stream, *stmp; |
341 | struct ltt_kernel_event *event, *etmp; | |
c363b55d | 342 | |
33a2b854 | 343 | DBG("[trace] Closing channel fd %d", channel->fd); |
c363b55d DG |
344 | /* Close kernel fd */ |
345 | close(channel->fd); | |
c363b55d DG |
346 | |
347 | /* For each stream in the channel list */ | |
af9737e9 | 348 | cds_list_for_each_entry_safe(stream, stmp, &channel->stream_list.head, list) { |
62499ad6 | 349 | trace_kernel_destroy_stream(stream); |
c363b55d DG |
350 | } |
351 | ||
352 | /* For each event in the channel list */ | |
af9737e9 | 353 | cds_list_for_each_entry_safe(event, etmp, &channel->events_list.head, list) { |
62499ad6 | 354 | trace_kernel_destroy_event(event); |
c363b55d DG |
355 | } |
356 | ||
357 | /* Remove from channel list */ | |
358 | cds_list_del(&channel->list); | |
f9815039 DG |
359 | |
360 | free(channel->pathname); | |
361 | free(channel->channel); | |
362 | free(channel->ctx); | |
c363b55d DG |
363 | free(channel); |
364 | } | |
365 | ||
050349bb DG |
366 | /* |
367 | * Cleanup kernel metadata structure. | |
368 | */ | |
62499ad6 | 369 | void trace_kernel_destroy_metadata(struct ltt_kernel_metadata *metadata) |
c363b55d | 370 | { |
33a2b854 | 371 | DBG("[trace] Closing metadata fd %d", metadata->fd); |
c363b55d DG |
372 | /* Close kernel fd */ |
373 | close(metadata->fd); | |
c363b55d | 374 | |
f9815039 DG |
375 | free(metadata->conf); |
376 | free(metadata->pathname); | |
c363b55d DG |
377 | free(metadata); |
378 | } | |
379 | ||
050349bb | 380 | /* |
62499ad6 | 381 | * Cleanup kernel session structure |
050349bb | 382 | */ |
62499ad6 | 383 | void trace_kernel_destroy_session(struct ltt_kernel_session *session) |
c363b55d | 384 | { |
af9737e9 | 385 | struct ltt_kernel_channel *channel, *ctmp; |
c363b55d | 386 | |
33a2b854 | 387 | DBG("[trace] Closing session fd %d", session->fd); |
c363b55d DG |
388 | /* Close kernel fds */ |
389 | close(session->fd); | |
f9815039 | 390 | |
70dc1c34 DG |
391 | if (session->metadata_stream_fd != 0) { |
392 | DBG("[trace] Closing metadata stream fd %d", session->metadata_stream_fd); | |
393 | close(session->metadata_stream_fd); | |
394 | } | |
c363b55d | 395 | |
d36b8583 | 396 | if (session->metadata != NULL) { |
62499ad6 | 397 | trace_kernel_destroy_metadata(session->metadata); |
d36b8583 | 398 | } |
c363b55d | 399 | |
af9737e9 | 400 | cds_list_for_each_entry_safe(channel, ctmp, &session->channel_list.head, list) { |
62499ad6 | 401 | trace_kernel_destroy_channel(channel); |
c363b55d DG |
402 | } |
403 | ||
f9815039 | 404 | free(session->trace_path); |
c363b55d DG |
405 | free(session); |
406 | } |