1ab2857ce2a2328050d6fde0d8c70809d85ecbda
[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; 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
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 "ltt-sessiond.h"
28 #include "trace.h"
29
30 /*
31 * get_kernel_channel_by_name
32 *
33 * Find the channel name for the given kernel session.
34 */
35 struct ltt_kernel_channel *get_kernel_channel_by_name(
36 char *name, struct ltt_kernel_session *session)
37 {
38 struct ltt_kernel_channel *chan;
39
40 if (session == NULL) {
41 ERR("Undefine session");
42 goto error;
43 }
44
45 cds_list_for_each_entry(chan, &session->channel_list.head, list) {
46 if (strcmp(name, chan->channel->name) == 0) {
47 DBG("Found channel by name %s", name);
48 return chan;
49 }
50 }
51
52 error:
53 return NULL;
54 }
55
56 /*
57 * get_kernel_event_by_name
58 *
59 * Find the event name for the given channel.
60 */
61 struct ltt_kernel_event *get_kernel_event_by_name(
62 char *name, struct ltt_kernel_channel *channel)
63 {
64 struct ltt_kernel_event *ev;
65
66 if (channel == NULL) {
67 ERR("Undefine channel");
68 goto error;
69 }
70
71 cds_list_for_each_entry(ev, &channel->events_list.head, list) {
72 if (strcmp(name, ev->event->name) == 0) {
73 DBG("Found event by name %s for channel %s", name,
74 channel->channel->name);
75 return ev;
76 }
77 }
78
79 error:
80 return NULL;
81 }
82
83 /*
84 * trace_create_kernel_session
85 *
86 * Allocate and initialize a kernel session data structure.
87 *
88 * Return pointer to structure or NULL.
89 */
90 struct ltt_kernel_session *trace_create_kernel_session(void)
91 {
92 struct ltt_kernel_session *lks;
93
94 /* Allocate a new ltt kernel session */
95 lks = malloc(sizeof(struct ltt_kernel_session));
96 if (lks == NULL) {
97 perror("create kernel session malloc");
98 goto error;
99 }
100
101 /* Init data structure */
102 lks->fd = 0;
103 lks->metadata_stream_fd = 0;
104 lks->channel_count = 0;
105 lks->stream_count_global = 0;
106 lks->metadata = NULL;
107 CDS_INIT_LIST_HEAD(&lks->channel_list.head);
108
109 return lks;
110
111 error:
112 return NULL;
113 }
114
115 /*
116 * trace_create_kernel_channel
117 *
118 * Allocate and initialize a kernel channel data structure.
119 *
120 * Return pointer to structure or NULL.
121 */
122 struct ltt_kernel_channel *trace_create_kernel_channel(struct lttng_channel *chan)
123 {
124 int ret;
125 struct ltt_kernel_channel *lkc;
126
127 lkc = malloc(sizeof(struct ltt_kernel_channel));
128 if (lkc == NULL) {
129 perror("ltt_kernel_channel malloc");
130 goto error;
131 }
132
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));
139
140 lkc->fd = 0;
141 lkc->stream_count = 0;
142 lkc->enabled = 1;
143 /* Init linked list */
144 CDS_INIT_LIST_HEAD(&lkc->events_list.head);
145 CDS_INIT_LIST_HEAD(&lkc->stream_list.head);
146 /* Set default trace output path */
147 ret = asprintf(&lkc->pathname, "%s", DEFAULT_TRACE_OUTPUT);
148 if (ret < 0) {
149 perror("asprintf kernel create channel");
150 goto error;
151 }
152
153 return lkc;
154
155 error:
156 return NULL;
157 }
158
159 /*
160 * trace_create_kernel_event
161 *
162 * Allocate and initialize a kernel event. Set name and event type.
163 *
164 * Return pointer to structure or NULL.
165 */
166 struct ltt_kernel_event *trace_create_kernel_event(struct lttng_event *ev)
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
178 switch (ev->type) {
179 case LTTNG_EVENT_KPROBES:
180 attr->instrumentation = LTTNG_KERNEL_KPROBES;
181 attr->u.kprobe.addr = ev->attr.kprobe.addr;
182 attr->u.kprobe.offset = ev->attr.kprobe.offset;
183 strncpy(attr->u.kprobe.symbol_name,
184 ev->attr.kprobe.symbol_name, LTTNG_SYM_NAME_LEN);
185 break;
186 case LTTNG_EVENT_FUNCTION:
187 attr->instrumentation = LTTNG_KERNEL_FUNCTION;
188 strncpy(attr->u.ftrace.symbol_name,
189 ev->attr.ftrace.symbol_name, LTTNG_SYM_NAME_LEN);
190 break;
191 case LTTNG_EVENT_TRACEPOINTS:
192 attr->instrumentation = LTTNG_KERNEL_TRACEPOINTS;
193 break;
194 default:
195 ERR("Unknown kernel instrumentation type (%d)", ev->type);
196 goto error;
197 }
198
199 /* Copy event name */
200 strncpy(attr->name, ev->name, LTTNG_SYM_NAME_LEN);
201
202 /* Setting up a kernel event */
203 lke->fd = 0;
204 lke->event = attr;
205 lke->enabled = 1;
206
207 return lke;
208
209 error:
210 return NULL;
211 }
212
213 /*
214 * trace_create_kernel_metadata
215 *
216 * Allocate and initialize a kernel metadata.
217 *
218 * Return pointer to structure or NULL.
219 */
220 struct ltt_kernel_metadata *trace_create_kernel_metadata(void)
221 {
222 int ret;
223 struct ltt_kernel_metadata *lkm;
224 struct lttng_channel *chan;
225
226 lkm = malloc(sizeof(struct ltt_kernel_metadata));
227 chan = malloc(sizeof(struct lttng_channel));
228 if (lkm == NULL || chan == NULL) {
229 perror("kernel metadata malloc");
230 goto error;
231 }
232
233 /* Set default attributes */
234 chan->attr.overwrite = DEFAULT_CHANNEL_OVERWRITE;
235 chan->attr.subbuf_size = DEFAULT_CHANNEL_SUBBUF_SIZE;
236 chan->attr.num_subbuf = DEFAULT_CHANNEL_SUBBUF_NUM;
237 chan->attr.switch_timer_interval = DEFAULT_CHANNEL_SWITCH_TIMER;
238 chan->attr.read_timer_interval = DEFAULT_CHANNEL_READ_TIMER;
239
240 /* Init metadata */
241 lkm->fd = 0;
242 lkm->conf = chan;
243 /* Set default metadata path */
244 ret = asprintf(&lkm->pathname, "%s/metadata", DEFAULT_TRACE_OUTPUT);
245 if (ret < 0) {
246 perror("asprintf kernel metadata");
247 goto error;
248 }
249
250 return lkm;
251
252 error:
253 return NULL;
254 }
255
256 /*
257 * trace_create_kernel_stream
258 *
259 * Allocate and initialize a kernel stream. The stream is set to ACTIVE_FD by
260 * default.
261 *
262 * Return pointer to structure or NULL.
263 */
264 struct ltt_kernel_stream *trace_create_kernel_stream(void)
265 {
266 struct ltt_kernel_stream *lks;
267
268 lks = malloc(sizeof(struct ltt_kernel_stream));
269 if (lks == NULL) {
270 perror("kernel stream malloc");
271 goto error;
272 }
273
274 /* Init stream */
275 lks->fd = 0;
276 lks->pathname = NULL;
277 lks->state = 0;
278
279 return lks;
280
281 error:
282 return NULL;
283 }
284
285 void trace_destroy_kernel_stream(struct ltt_kernel_stream *stream)
286 {
287 DBG("[trace] Closing stream fd %d", stream->fd);
288 /* Close kernel fd */
289 close(stream->fd);
290 free(stream->pathname);
291
292 /* Remove from stream list */
293 cds_list_del(&stream->list);
294 free(stream);
295 }
296
297 void trace_destroy_kernel_event(struct ltt_kernel_event *event)
298 {
299 DBG("[trace] Closing event fd %d", event->fd);
300 /* Close kernel fd */
301 close(event->fd);
302 /* Free attributes */
303 free(event->event);
304
305 /* Remove from event list */
306 cds_list_del(&event->list);
307 free(event);
308 }
309
310 void trace_destroy_kernel_channel(struct ltt_kernel_channel *channel)
311 {
312 struct ltt_kernel_stream *stream;
313 struct ltt_kernel_event *event;
314
315 DBG("[trace] Closing channel fd %d", channel->fd);
316 /* Close kernel fd */
317 close(channel->fd);
318 free(channel->pathname);
319 /* Free attributes structure */
320 free(channel->channel);
321
322 /* For each stream in the channel list */
323 cds_list_for_each_entry(stream, &channel->stream_list.head, list) {
324 trace_destroy_kernel_stream(stream);
325 }
326
327 /* For each event in the channel list */
328 cds_list_for_each_entry(event, &channel->events_list.head, list) {
329 trace_destroy_kernel_event(event);
330 }
331
332 /* Remove from channel list */
333 cds_list_del(&channel->list);
334 free(channel);
335 }
336
337 void trace_destroy_kernel_metadata(struct ltt_kernel_metadata *metadata)
338 {
339 DBG("[trace] Closing metadata fd %d", metadata->fd);
340 /* Close kernel fd */
341 close(metadata->fd);
342 /* Free attributes */
343 free(metadata->conf);
344
345 free(metadata);
346 }
347
348 void trace_destroy_kernel_session(struct ltt_kernel_session *session)
349 {
350 struct ltt_kernel_channel *channel;
351
352 DBG("[trace] Closing session fd %d", session->fd);
353 /* Close kernel fds */
354 close(session->fd);
355 if (session->metadata_stream_fd != 0) {
356 DBG("[trace] Closing metadata stream fd %d", session->metadata_stream_fd);
357 close(session->metadata_stream_fd);
358 }
359
360 if (session->metadata != NULL) {
361 trace_destroy_kernel_metadata(session->metadata);
362 }
363
364 cds_list_for_each_entry(channel, &session->channel_list.head, list) {
365 trace_destroy_kernel_channel(channel);
366 }
367
368 free(session);
369 }
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