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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 | |
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> |
54012638 DG |
24 | #include <urcu/list.h> |
25 | ||
26 | #include "ltt-sessiond.h" | |
27 | #include "trace.h" | |
28 | ||
29 | /* | |
30 | * trace_create_kernel_session | |
31 | * | |
32 | * Allocate and initialize a kernel session data structure. | |
33 | * | |
34 | * Return pointer to structure or NULL. | |
35 | */ | |
36 | struct ltt_kernel_session *trace_create_kernel_session(void) | |
37 | { | |
38 | struct ltt_kernel_session *lks; | |
39 | ||
40 | /* Allocate a new ltt kernel session */ | |
41 | lks = malloc(sizeof(struct ltt_kernel_session)); | |
42 | if (lks == NULL) { | |
43 | perror("create kernel session malloc"); | |
44 | goto error; | |
45 | } | |
46 | ||
47 | /* Init data structure */ | |
48 | lks->fd = 0; | |
49 | lks->metadata_stream_fd = 0; | |
50 | lks->channel_count = 0; | |
51 | lks->stream_count_global = 0; | |
52 | lks->metadata = NULL; | |
53 | CDS_INIT_LIST_HEAD(&lks->channel_list.head); | |
54 | ||
55 | return lks; | |
56 | ||
57 | error: | |
58 | return NULL; | |
59 | } | |
60 | ||
61 | /* | |
62 | * trace_create_kernel_channel | |
63 | * | |
64 | * Allocate and initialize a kernel channel data structure. | |
65 | * | |
66 | * Return pointer to structure or NULL. | |
67 | */ | |
68 | struct ltt_kernel_channel *trace_create_kernel_channel(void) | |
69 | { | |
70 | int ret; | |
71 | struct ltt_kernel_channel *lkc; | |
72 | struct lttng_kernel_channel *chan; | |
73 | ||
74 | lkc = malloc(sizeof(struct ltt_kernel_channel)); | |
75 | chan = malloc(sizeof(struct lttng_kernel_channel)); | |
76 | if (lkc == NULL || chan == NULL) { | |
77 | perror("kernel channel malloc"); | |
78 | goto error; | |
79 | } | |
80 | ||
81 | /* Default value to channel */ | |
82 | chan->overwrite = DEFAULT_KERNEL_OVERWRITE; | |
83 | chan->subbuf_size = DEFAULT_KERNEL_SUBBUF_SIZE; | |
84 | chan->num_subbuf = DEFAULT_KERNEL_SUBBUF_NUM; | |
85 | chan->switch_timer_interval = DEFAULT_KERNEL_SWITCH_TIMER; | |
86 | chan->read_timer_interval = DEFAULT_KERNEL_READ_TIMER; | |
87 | ||
88 | lkc->fd = 0; | |
89 | lkc->stream_count = 0; | |
90 | lkc->channel = chan; | |
91 | /* Init linked list */ | |
92 | CDS_INIT_LIST_HEAD(&lkc->events_list.head); | |
93 | CDS_INIT_LIST_HEAD(&lkc->stream_list.head); | |
94 | /* Set default trace output path */ | |
95 | ret = asprintf(&lkc->pathname, "%s", DEFAULT_TRACE_OUTPUT); | |
96 | if (ret < 0) { | |
97 | perror("asprintf kernel create channel"); | |
98 | goto error; | |
99 | } | |
100 | ||
101 | return lkc; | |
102 | ||
103 | error: | |
104 | return NULL; | |
105 | } | |
106 | ||
107 | /* | |
108 | * trace_create_kernel_event | |
109 | * | |
110 | * Allocate and initialize a kernel event. Set name and event type. | |
111 | * | |
112 | * Return pointer to structure or NULL. | |
113 | */ | |
114 | struct ltt_kernel_event *trace_create_kernel_event(char *name, | |
115 | enum lttng_kernel_instrumentation type) | |
116 | { | |
117 | struct ltt_kernel_event *lke; | |
118 | struct lttng_kernel_event *attr; | |
119 | ||
120 | lke = malloc(sizeof(struct ltt_kernel_event)); | |
121 | attr = malloc(sizeof(struct lttng_kernel_event)); | |
122 | if (lke == NULL || attr == NULL) { | |
123 | perror("kernel event malloc"); | |
124 | goto error; | |
125 | } | |
126 | ||
127 | /* Init event attribute */ | |
128 | attr->instrumentation = type; | |
129 | strncpy(attr->name, name, LTTNG_SYM_NAME_LEN); | |
130 | /* Setting up a kernel event */ | |
131 | lke->fd = 0; | |
132 | lke->event = attr; | |
133 | ||
134 | return lke; | |
135 | ||
136 | error: | |
137 | return NULL; | |
138 | } | |
139 | ||
140 | /* | |
141 | * trace_create_kernel_metadata | |
142 | * | |
143 | * Allocate and initialize a kernel metadata. | |
144 | * | |
145 | * Return pointer to structure or NULL. | |
146 | */ | |
147 | struct ltt_kernel_metadata *trace_create_kernel_metadata(void) | |
148 | { | |
149 | int ret; | |
150 | struct ltt_kernel_metadata *lkm; | |
151 | struct lttng_kernel_channel *attr; | |
152 | ||
153 | lkm = malloc(sizeof(struct ltt_kernel_metadata)); | |
154 | attr = malloc(sizeof(struct lttng_kernel_channel)); | |
155 | if (lkm == NULL || attr == NULL) { | |
156 | perror("kernel metadata malloc"); | |
157 | goto error; | |
158 | } | |
159 | ||
160 | /* Set default attributes */ | |
161 | attr->overwrite = DEFAULT_KERNEL_OVERWRITE; | |
162 | attr->subbuf_size = DEFAULT_KERNEL_SUBBUF_SIZE; | |
163 | attr->num_subbuf = DEFAULT_KERNEL_SUBBUF_NUM; | |
164 | attr->switch_timer_interval = DEFAULT_KERNEL_SWITCH_TIMER; | |
165 | attr->read_timer_interval = DEFAULT_KERNEL_READ_TIMER; | |
166 | ||
167 | /* Init metadata */ | |
168 | lkm->fd = 0; | |
169 | lkm->conf = attr; | |
170 | /* Set default metadata path */ | |
171 | ret = asprintf(&lkm->pathname, "%s/metadata", DEFAULT_TRACE_OUTPUT); | |
172 | if (ret < 0) { | |
173 | perror("asprintf kernel metadata"); | |
174 | goto error; | |
175 | } | |
176 | ||
177 | return lkm; | |
178 | ||
179 | error: | |
180 | return NULL; | |
181 | } | |
182 | ||
183 | /* | |
184 | * trace_create_kernel_stream | |
185 | * | |
186 | * Allocate and initialize a kernel stream. The stream is set to ACTIVE_FD by | |
187 | * default. | |
188 | * | |
189 | * Return pointer to structure or NULL. | |
190 | */ | |
191 | struct ltt_kernel_stream *trace_create_kernel_stream(void) | |
192 | { | |
193 | struct ltt_kernel_stream *lks; | |
194 | ||
195 | lks = malloc(sizeof(struct ltt_kernel_stream)); | |
196 | if (lks == NULL) { | |
197 | perror("kernel stream malloc"); | |
198 | goto error; | |
199 | } | |
200 | ||
201 | /* Init stream */ | |
202 | lks->fd = 0; | |
203 | lks->pathname = NULL; | |
204 | lks->state = 0; | |
205 | ||
206 | return lks; | |
207 | ||
208 | error: | |
209 | return NULL; | |
210 | } | |
c363b55d DG |
211 | |
212 | void trace_destroy_kernel_stream(struct ltt_kernel_stream *stream) | |
213 | { | |
214 | /* Close kernel fd */ | |
215 | close(stream->fd); | |
216 | free(stream->pathname); | |
217 | ||
218 | /* Remove from stream list */ | |
219 | cds_list_del(&stream->list); | |
220 | free(stream); | |
221 | } | |
222 | ||
223 | void trace_destroy_kernel_event(struct ltt_kernel_event *event) | |
224 | { | |
225 | /* Close kernel fd */ | |
226 | close(event->fd); | |
227 | /* Free attributes */ | |
228 | free(event->event); | |
229 | ||
230 | /* Remove from event list */ | |
231 | cds_list_del(&event->list); | |
232 | free(event); | |
233 | } | |
234 | ||
235 | void trace_destroy_kernel_channel(struct ltt_kernel_channel *channel) | |
236 | { | |
237 | struct ltt_kernel_stream *stream; | |
238 | struct ltt_kernel_event *event; | |
239 | ||
240 | /* Close kernel fd */ | |
241 | close(channel->fd); | |
242 | free(channel->pathname); | |
243 | /* Free attributes structure */ | |
244 | free(channel->channel); | |
245 | ||
246 | /* For each stream in the channel list */ | |
247 | cds_list_for_each_entry(stream, &channel->stream_list.head, list) { | |
248 | trace_destroy_kernel_stream(stream); | |
249 | } | |
250 | ||
251 | /* For each event in the channel list */ | |
252 | cds_list_for_each_entry(event, &channel->events_list.head, list) { | |
253 | trace_destroy_kernel_event(event); | |
254 | } | |
255 | ||
256 | /* Remove from channel list */ | |
257 | cds_list_del(&channel->list); | |
258 | free(channel); | |
259 | } | |
260 | ||
261 | void trace_destroy_kernel_metadata(struct ltt_kernel_metadata *metadata) | |
262 | { | |
263 | /* Close kernel fd */ | |
264 | close(metadata->fd); | |
265 | /* Free attributes */ | |
266 | free(metadata->conf); | |
267 | ||
268 | free(metadata); | |
269 | } | |
270 | ||
271 | void trace_destroy_kernel_session(struct ltt_kernel_session *session) | |
272 | { | |
273 | struct ltt_kernel_channel *channel; | |
274 | ||
275 | /* Close kernel fds */ | |
276 | close(session->fd); | |
277 | close(session->metadata_stream_fd); | |
278 | ||
279 | trace_destroy_kernel_metadata(session->metadata); | |
280 | ||
281 | cds_list_for_each_entry(channel, &session->channel_list.head, list) { | |
282 | trace_destroy_kernel_channel(channel); | |
283 | } | |
284 | ||
285 | free(session); | |
286 | } |