41c4355e939fa67e4c8a7f8b2c4d660e4fc0e6ff
[lttng-tools.git] / ltt-sessiond / trace.c
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; only version 2
7 * of the License.
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>
23 #include <unistd.h>
24 #include <urcu/list.h>
25
26 #include "lttngerr.h"
27 #include "trace.h"
28
29 /*
30 * get_kernel_channel_by_name
31 *
32 * Find the channel name for the given kernel session.
33 */
34 struct ltt_kernel_channel *get_kernel_channel_by_name(
35 char *name, struct ltt_kernel_session *session)
36 {
37 struct ltt_kernel_channel *chan;
38
39 if (session == NULL) {
40 ERR("Undefine session");
41 goto error;
42 }
43
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 /*
56 * get_kernel_event_by_name
57 *
58 * Find the event name for the given channel.
59 */
60 struct ltt_kernel_event *get_kernel_event_by_name(
61 char *name, struct ltt_kernel_channel *channel)
62 {
63 struct ltt_kernel_event *ev;
64
65 if (channel == NULL) {
66 ERR("Undefine channel");
67 goto error;
68 }
69
70 cds_list_for_each_entry(ev, &channel->events_list.head, list) {
71 if (strcmp(name, ev->event->name) == 0) {
72 DBG("Found event by name %s for channel %s", name,
73 channel->channel->name);
74 return ev;
75 }
76 }
77
78 error:
79 return NULL;
80 }
81
82 /*
83 * trace_create_kernel_session
84 *
85 * Allocate and initialize a kernel session data structure.
86 *
87 * Return pointer to structure or NULL.
88 */
89 struct ltt_kernel_session *trace_create_kernel_session(void)
90 {
91 struct ltt_kernel_session *lks;
92
93 /* Allocate a new ltt kernel session */
94 lks = malloc(sizeof(struct ltt_kernel_session));
95 if (lks == NULL) {
96 perror("create kernel session malloc");
97 goto error;
98 }
99
100 /* Init data structure */
101 lks->fd = 0;
102 lks->metadata_stream_fd = 0;
103 lks->channel_count = 0;
104 lks->stream_count_global = 0;
105 lks->metadata = NULL;
106 CDS_INIT_LIST_HEAD(&lks->channel_list.head);
107
108 return lks;
109
110 error:
111 return NULL;
112 }
113
114 /*
115 * trace_create_kernel_channel
116 *
117 * Allocate and initialize a kernel channel data structure.
118 *
119 * Return pointer to structure or NULL.
120 */
121 struct ltt_kernel_channel *trace_create_kernel_channel(struct lttng_channel *chan, char *path)
122 {
123 int ret;
124 struct ltt_kernel_channel *lkc;
125
126 lkc = malloc(sizeof(struct ltt_kernel_channel));
127 if (lkc == NULL) {
128 perror("ltt_kernel_channel malloc");
129 goto error;
130 }
131
132 lkc->channel = malloc(sizeof(struct lttng_channel));
133 if (lkc->channel == NULL) {
134 perror("lttng_channel malloc");
135 goto error;
136 }
137 memcpy(lkc->channel, chan, sizeof(struct lttng_channel));
138
139 lkc->fd = 0;
140 lkc->stream_count = 0;
141 lkc->event_count = 0;
142 lkc->enabled = 1;
143 lkc->ctx = NULL;
144 /* Init linked list */
145 CDS_INIT_LIST_HEAD(&lkc->events_list.head);
146 CDS_INIT_LIST_HEAD(&lkc->stream_list.head);
147 /* Set default trace output path */
148 ret = asprintf(&lkc->pathname, "%s", path);
149 if (ret < 0) {
150 perror("asprintf kernel create channel");
151 goto error;
152 }
153
154 return lkc;
155
156 error:
157 return NULL;
158 }
159
160 /*
161 * trace_create_kernel_event
162 *
163 * Allocate and initialize a kernel event. Set name and event type.
164 *
165 * Return pointer to structure or NULL.
166 */
167 struct ltt_kernel_event *trace_create_kernel_event(struct lttng_event *ev)
168 {
169 struct ltt_kernel_event *lke;
170 struct lttng_kernel_event *attr;
171
172 lke = malloc(sizeof(struct ltt_kernel_event));
173 attr = malloc(sizeof(struct lttng_kernel_event));
174 if (lke == NULL || attr == NULL) {
175 perror("kernel event malloc");
176 goto error;
177 }
178
179 switch (ev->type) {
180 case LTTNG_EVENT_PROBE:
181 attr->instrumentation = LTTNG_KERNEL_KPROBE;
182 attr->u.kprobe.addr = ev->attr.probe.addr;
183 attr->u.kprobe.offset = ev->attr.probe.offset;
184 strncpy(attr->u.kprobe.symbol_name,
185 ev->attr.probe.symbol_name, LTTNG_SYM_NAME_LEN);
186 break;
187 case LTTNG_EVENT_FUNCTION:
188 attr->instrumentation = LTTNG_KERNEL_FUNCTION;
189 strncpy(attr->u.ftrace.symbol_name,
190 ev->attr.ftrace.symbol_name, LTTNG_SYM_NAME_LEN);
191 break;
192 case LTTNG_EVENT_TRACEPOINT:
193 attr->instrumentation = LTTNG_KERNEL_TRACEPOINT;
194 break;
195 default:
196 ERR("Unknown kernel instrumentation type (%d)", ev->type);
197 goto error;
198 }
199
200 /* Copy event name */
201 strncpy(attr->name, ev->name, LTTNG_SYM_NAME_LEN);
202
203 /* Setting up a kernel event */
204 lke->fd = 0;
205 lke->event = attr;
206 lke->enabled = 1;
207 lke->ctx = NULL;
208
209 return lke;
210
211 error:
212 return NULL;
213 }
214
215 /*
216 * trace_create_kernel_metadata
217 *
218 * Allocate and initialize a kernel metadata.
219 *
220 * Return pointer to structure or NULL.
221 */
222 struct ltt_kernel_metadata *trace_create_kernel_metadata(char *path)
223 {
224 int ret;
225 struct ltt_kernel_metadata *lkm;
226 struct lttng_channel *chan;
227
228 lkm = malloc(sizeof(struct ltt_kernel_metadata));
229 chan = malloc(sizeof(struct lttng_channel));
230 if (lkm == NULL || chan == NULL) {
231 perror("kernel metadata malloc");
232 goto error;
233 }
234
235 /* Set default attributes */
236 chan->attr.overwrite = DEFAULT_CHANNEL_OVERWRITE;
237 chan->attr.subbuf_size = DEFAULT_CHANNEL_SUBBUF_SIZE;
238 chan->attr.num_subbuf = DEFAULT_CHANNEL_SUBBUF_NUM;
239 chan->attr.switch_timer_interval = DEFAULT_CHANNEL_SWITCH_TIMER;
240 chan->attr.read_timer_interval = DEFAULT_CHANNEL_READ_TIMER;
241 chan->attr.output = DEFAULT_KERNEL_CHANNEL_OUTPUT;
242
243 /* Init metadata */
244 lkm->fd = 0;
245 lkm->conf = chan;
246 /* Set default metadata path */
247 ret = asprintf(&lkm->pathname, "%s/metadata", path);
248 if (ret < 0) {
249 perror("asprintf kernel metadata");
250 goto error;
251 }
252
253 return lkm;
254
255 error:
256 return NULL;
257 }
258
259 /*
260 * trace_create_kernel_stream
261 *
262 * Allocate and initialize a kernel stream. The stream is set to ACTIVE_FD by
263 * default.
264 *
265 * Return pointer to structure or NULL.
266 */
267 struct ltt_kernel_stream *trace_create_kernel_stream(void)
268 {
269 struct ltt_kernel_stream *lks;
270
271 lks = malloc(sizeof(struct ltt_kernel_stream));
272 if (lks == NULL) {
273 perror("kernel stream malloc");
274 goto error;
275 }
276
277 /* Init stream */
278 lks->fd = 0;
279 lks->pathname = NULL;
280 lks->state = 0;
281
282 return lks;
283
284 error:
285 return NULL;
286 }
287
288 void trace_destroy_kernel_stream(struct ltt_kernel_stream *stream)
289 {
290 DBG("[trace] Closing stream fd %d", stream->fd);
291 /* Close kernel fd */
292 close(stream->fd);
293 free(stream->pathname);
294
295 /* Remove from stream list */
296 cds_list_del(&stream->list);
297 free(stream);
298 }
299
300 void trace_destroy_kernel_event(struct ltt_kernel_event *event)
301 {
302 DBG("[trace] Closing event fd %d", event->fd);
303 /* Close kernel fd */
304 close(event->fd);
305 /* Free attributes */
306 free(event->event);
307
308 /* Remove from event list */
309 cds_list_del(&event->list);
310 free(event);
311 }
312
313 void trace_destroy_kernel_channel(struct ltt_kernel_channel *channel)
314 {
315 struct ltt_kernel_stream *stream, *stmp;
316 struct ltt_kernel_event *event, *etmp;
317
318 DBG("[trace] Closing channel fd %d", channel->fd);
319 /* Close kernel fd */
320 close(channel->fd);
321 free(channel->pathname);
322 /* Free attributes structure */
323 free(channel->channel);
324
325 /* For each stream in the channel list */
326 cds_list_for_each_entry_safe(stream, stmp, &channel->stream_list.head, list) {
327 trace_destroy_kernel_stream(stream);
328 }
329
330 /* For each event in the channel list */
331 cds_list_for_each_entry_safe(event, etmp, &channel->events_list.head, list) {
332 trace_destroy_kernel_event(event);
333 }
334
335 /* Remove from channel list */
336 cds_list_del(&channel->list);
337 free(channel);
338 }
339
340 void trace_destroy_kernel_metadata(struct ltt_kernel_metadata *metadata)
341 {
342 DBG("[trace] Closing metadata fd %d", metadata->fd);
343 /* Close kernel fd */
344 close(metadata->fd);
345 /* Free attributes */
346 free(metadata->conf);
347
348 free(metadata);
349 }
350
351 void trace_destroy_kernel_session(struct ltt_kernel_session *session)
352 {
353 struct ltt_kernel_channel *channel, *ctmp;
354
355 DBG("[trace] Closing session fd %d", session->fd);
356 /* Close kernel fds */
357 close(session->fd);
358 if (session->metadata_stream_fd != 0) {
359 DBG("[trace] Closing metadata stream fd %d", session->metadata_stream_fd);
360 close(session->metadata_stream_fd);
361 }
362
363 if (session->metadata != NULL) {
364 trace_destroy_kernel_metadata(session->metadata);
365 }
366
367 cds_list_for_each_entry_safe(channel, ctmp, &session->channel_list.head, list) {
368 trace_destroy_kernel_channel(channel);
369 }
370
371 free(session);
372 }
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