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