Fix message argument type
[lttng-tools.git] / ltt-sessiond / trace.c
CommitLineData
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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>
c363b55d 23#include <unistd.h>
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24#include <urcu/list.h>
25
33a2b854 26#include "lttngerr.h"
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27#include "ltt-sessiond.h"
28#include "trace.h"
29
30/*
31 * trace_create_kernel_session
32 *
33 * Allocate and initialize a kernel session data structure.
34 *
35 * Return pointer to structure or NULL.
36 */
37struct ltt_kernel_session *trace_create_kernel_session(void)
38{
39 struct ltt_kernel_session *lks;
40
41 /* Allocate a new ltt kernel session */
42 lks = malloc(sizeof(struct ltt_kernel_session));
43 if (lks == NULL) {
44 perror("create kernel session malloc");
45 goto error;
46 }
47
48 /* Init data structure */
49 lks->fd = 0;
50 lks->metadata_stream_fd = 0;
51 lks->channel_count = 0;
52 lks->stream_count_global = 0;
53 lks->metadata = NULL;
54 CDS_INIT_LIST_HEAD(&lks->channel_list.head);
55
56 return lks;
57
58error:
59 return NULL;
60}
61
62/*
63 * trace_create_kernel_channel
64 *
65 * Allocate and initialize a kernel channel data structure.
66 *
67 * Return pointer to structure or NULL.
68 */
69struct ltt_kernel_channel *trace_create_kernel_channel(void)
70{
71 int ret;
72 struct ltt_kernel_channel *lkc;
73 struct lttng_kernel_channel *chan;
74
75 lkc = malloc(sizeof(struct ltt_kernel_channel));
76 chan = malloc(sizeof(struct lttng_kernel_channel));
77 if (lkc == NULL || chan == NULL) {
78 perror("kernel channel malloc");
79 goto error;
80 }
81
82 /* Default value to channel */
83 chan->overwrite = DEFAULT_KERNEL_OVERWRITE;
84 chan->subbuf_size = DEFAULT_KERNEL_SUBBUF_SIZE;
85 chan->num_subbuf = DEFAULT_KERNEL_SUBBUF_NUM;
86 chan->switch_timer_interval = DEFAULT_KERNEL_SWITCH_TIMER;
87 chan->read_timer_interval = DEFAULT_KERNEL_READ_TIMER;
88
89 lkc->fd = 0;
90 lkc->stream_count = 0;
91 lkc->channel = chan;
92 /* Init linked list */
93 CDS_INIT_LIST_HEAD(&lkc->events_list.head);
94 CDS_INIT_LIST_HEAD(&lkc->stream_list.head);
95 /* Set default trace output path */
96 ret = asprintf(&lkc->pathname, "%s", DEFAULT_TRACE_OUTPUT);
97 if (ret < 0) {
98 perror("asprintf kernel create channel");
99 goto error;
100 }
101
102 return lkc;
103
104error:
105 return NULL;
106}
107
108/*
109 * trace_create_kernel_event
110 *
111 * Allocate and initialize a kernel event. Set name and event type.
112 *
113 * Return pointer to structure or NULL.
114 */
115struct ltt_kernel_event *trace_create_kernel_event(char *name,
116 enum lttng_kernel_instrumentation type)
117{
118 struct ltt_kernel_event *lke;
119 struct lttng_kernel_event *attr;
120
121 lke = malloc(sizeof(struct ltt_kernel_event));
122 attr = malloc(sizeof(struct lttng_kernel_event));
123 if (lke == NULL || attr == NULL) {
124 perror("kernel event malloc");
125 goto error;
126 }
127
128 /* Init event attribute */
129 attr->instrumentation = type;
130 strncpy(attr->name, name, LTTNG_SYM_NAME_LEN);
131 /* Setting up a kernel event */
132 lke->fd = 0;
133 lke->event = attr;
134
135 return lke;
136
137error:
138 return NULL;
139}
140
141/*
142 * trace_create_kernel_metadata
143 *
144 * Allocate and initialize a kernel metadata.
145 *
146 * Return pointer to structure or NULL.
147 */
148struct ltt_kernel_metadata *trace_create_kernel_metadata(void)
149{
150 int ret;
151 struct ltt_kernel_metadata *lkm;
152 struct lttng_kernel_channel *attr;
153
154 lkm = malloc(sizeof(struct ltt_kernel_metadata));
155 attr = malloc(sizeof(struct lttng_kernel_channel));
156 if (lkm == NULL || attr == NULL) {
157 perror("kernel metadata malloc");
158 goto error;
159 }
160
161 /* Set default attributes */
162 attr->overwrite = DEFAULT_KERNEL_OVERWRITE;
163 attr->subbuf_size = DEFAULT_KERNEL_SUBBUF_SIZE;
164 attr->num_subbuf = DEFAULT_KERNEL_SUBBUF_NUM;
165 attr->switch_timer_interval = DEFAULT_KERNEL_SWITCH_TIMER;
166 attr->read_timer_interval = DEFAULT_KERNEL_READ_TIMER;
167
168 /* Init metadata */
169 lkm->fd = 0;
170 lkm->conf = attr;
171 /* Set default metadata path */
172 ret = asprintf(&lkm->pathname, "%s/metadata", DEFAULT_TRACE_OUTPUT);
173 if (ret < 0) {
174 perror("asprintf kernel metadata");
175 goto error;
176 }
177
178 return lkm;
179
180error:
181 return NULL;
182}
183
184/*
185 * trace_create_kernel_stream
186 *
187 * Allocate and initialize a kernel stream. The stream is set to ACTIVE_FD by
188 * default.
189 *
190 * Return pointer to structure or NULL.
191 */
192struct ltt_kernel_stream *trace_create_kernel_stream(void)
193{
194 struct ltt_kernel_stream *lks;
195
196 lks = malloc(sizeof(struct ltt_kernel_stream));
197 if (lks == NULL) {
198 perror("kernel stream malloc");
199 goto error;
200 }
201
202 /* Init stream */
203 lks->fd = 0;
204 lks->pathname = NULL;
205 lks->state = 0;
206
207 return lks;
208
209error:
210 return NULL;
211}
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212
213void trace_destroy_kernel_stream(struct ltt_kernel_stream *stream)
214{
33a2b854 215 DBG("[trace] Closing stream fd %d", stream->fd);
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216 /* Close kernel fd */
217 close(stream->fd);
218 free(stream->pathname);
219
220 /* Remove from stream list */
221 cds_list_del(&stream->list);
222 free(stream);
223}
224
225void trace_destroy_kernel_event(struct ltt_kernel_event *event)
226{
33a2b854 227 DBG("[trace] Closing event fd %d", event->fd);
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228 /* Close kernel fd */
229 close(event->fd);
230 /* Free attributes */
231 free(event->event);
232
233 /* Remove from event list */
234 cds_list_del(&event->list);
235 free(event);
236}
237
238void trace_destroy_kernel_channel(struct ltt_kernel_channel *channel)
239{
240 struct ltt_kernel_stream *stream;
241 struct ltt_kernel_event *event;
242
33a2b854 243 DBG("[trace] Closing channel fd %d", channel->fd);
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244 /* Close kernel fd */
245 close(channel->fd);
246 free(channel->pathname);
247 /* Free attributes structure */
248 free(channel->channel);
249
250 /* For each stream in the channel list */
251 cds_list_for_each_entry(stream, &channel->stream_list.head, list) {
252 trace_destroy_kernel_stream(stream);
253 }
254
255 /* For each event in the channel list */
256 cds_list_for_each_entry(event, &channel->events_list.head, list) {
257 trace_destroy_kernel_event(event);
258 }
259
260 /* Remove from channel list */
261 cds_list_del(&channel->list);
262 free(channel);
263}
264
265void trace_destroy_kernel_metadata(struct ltt_kernel_metadata *metadata)
266{
33a2b854 267 DBG("[trace] Closing metadata fd %d", metadata->fd);
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268 /* Close kernel fd */
269 close(metadata->fd);
270 /* Free attributes */
271 free(metadata->conf);
272
273 free(metadata);
274}
275
276void trace_destroy_kernel_session(struct ltt_kernel_session *session)
277{
278 struct ltt_kernel_channel *channel;
279
33a2b854 280 DBG("[trace] Closing session fd %d", session->fd);
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281 /* Close kernel fds */
282 close(session->fd);
33a2b854 283 DBG("[trace] Closing metadata stream fd %d", session->metadata_stream_fd);
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284 close(session->metadata_stream_fd);
285
286 trace_destroy_kernel_metadata(session->metadata);
287
288 cds_list_for_each_entry(channel, &session->channel_list.head, list) {
289 trace_destroy_kernel_channel(channel);
290 }
291
292 free(session);
293}
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