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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 | ||
33a2b854 | 26 | #include "lttngerr.h" |
54012638 DG |
27 | #include "ltt-sessiond.h" |
28 | #include "trace.h" | |
29 | ||
19e70852 DG |
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 | ||
54012638 DG |
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 | */ | |
f3ed775e | 122 | struct ltt_kernel_channel *trace_create_kernel_channel(struct lttng_channel *chan) |
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; | |
d36b8583 | 142 | lkc->enabled = 1; |
54012638 DG |
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 | */ | |
f3ed775e | 166 | struct ltt_kernel_event *trace_create_kernel_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 DG |
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 | ||
54012638 DG |
202 | /* Setting up a kernel event */ |
203 | lke->fd = 0; | |
204 | lke->event = attr; | |
d36b8583 | 205 | lke->enabled = 1; |
54012638 DG |
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; | |
f3ed775e | 224 | struct lttng_channel *chan; |
54012638 DG |
225 | |
226 | lkm = malloc(sizeof(struct ltt_kernel_metadata)); | |
f3ed775e DG |
227 | chan = malloc(sizeof(struct lttng_channel)); |
228 | if (lkm == NULL || chan == NULL) { | |
54012638 DG |
229 | perror("kernel metadata malloc"); |
230 | goto error; | |
231 | } | |
232 | ||
233 | /* Set default attributes */ | |
f3ed775e DG |
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; | |
54012638 DG |
239 | |
240 | /* Init metadata */ | |
241 | lkm->fd = 0; | |
f3ed775e | 242 | lkm->conf = chan; |
54012638 DG |
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 | } | |
c363b55d DG |
284 | |
285 | void trace_destroy_kernel_stream(struct ltt_kernel_stream *stream) | |
286 | { | |
33a2b854 | 287 | DBG("[trace] Closing stream fd %d", stream->fd); |
c363b55d DG |
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 | { | |
33a2b854 | 299 | DBG("[trace] Closing event fd %d", event->fd); |
c363b55d DG |
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 | ||
33a2b854 | 315 | DBG("[trace] Closing channel fd %d", channel->fd); |
c363b55d DG |
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 | { | |
33a2b854 | 339 | DBG("[trace] Closing metadata fd %d", metadata->fd); |
c363b55d DG |
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 | ||
33a2b854 | 352 | DBG("[trace] Closing session fd %d", session->fd); |
c363b55d DG |
353 | /* Close kernel fds */ |
354 | close(session->fd); | |
70dc1c34 DG |
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 | } | |
c363b55d | 359 | |
d36b8583 DG |
360 | if (session->metadata != NULL) { |
361 | trace_destroy_kernel_metadata(session->metadata); | |
362 | } | |
c363b55d DG |
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 | } |