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20fe2104 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 | ||
8c0faa1d | 19 | #define _GNU_SOURCE |
20fe2104 DG |
20 | #include <errno.h> |
21 | #include <stdlib.h> | |
22 | #include <stdio.h> | |
f34daff7 | 23 | #include <string.h> |
8c0faa1d | 24 | #include <unistd.h> |
20fe2104 | 25 | |
8c0faa1d | 26 | #include "lttngerr.h" |
20fe2104 DG |
27 | #include "ltt-sessiond.h" |
28 | #include "libkernelctl.h" | |
29 | #include "kernel-ctl.h" | |
20fe2104 DG |
30 | |
31 | /* | |
32 | * kernel_create_session | |
33 | * | |
54012638 DG |
34 | * Create a new kernel session, register it to the kernel tracer and add it to |
35 | * the session daemon session. | |
20fe2104 | 36 | */ |
8c0faa1d | 37 | int kernel_create_session(struct ltt_session *session, int tracer_fd) |
20fe2104 DG |
38 | { |
39 | int ret; | |
40 | struct ltt_kernel_session *lks; | |
41 | ||
54012638 DG |
42 | /* Allocate data structure */ |
43 | lks = trace_create_kernel_session(); | |
20fe2104 | 44 | if (lks == NULL) { |
54012638 | 45 | ret = -1; |
20fe2104 DG |
46 | goto error; |
47 | } | |
48 | ||
54012638 | 49 | /* Kernel tracer session creation */ |
20fe2104 DG |
50 | ret = kernctl_create_session(tracer_fd); |
51 | if (ret < 0) { | |
54012638 | 52 | perror("ioctl kernel create session"); |
20fe2104 DG |
53 | goto error; |
54 | } | |
55 | ||
20fe2104 | 56 | lks->fd = ret; |
8c0faa1d DG |
57 | session->kernel_session = lks; |
58 | session->kern_session_count++; | |
8c0faa1d DG |
59 | |
60 | DBG("Kernel session created (fd: %d)", lks->fd); | |
20fe2104 DG |
61 | |
62 | return 0; | |
63 | ||
64 | error: | |
65 | return ret; | |
66 | } | |
67 | ||
68 | /* | |
69 | * kernel_create_channel | |
70 | * | |
54012638 DG |
71 | * Create a kernel channel, register it to the kernel tracer and add it to the |
72 | * kernel session. | |
20fe2104 | 73 | */ |
8c0faa1d | 74 | int kernel_create_channel(struct ltt_kernel_session *session) |
20fe2104 DG |
75 | { |
76 | int ret; | |
77 | struct ltt_kernel_channel *lkc; | |
20fe2104 | 78 | |
54012638 DG |
79 | /* Allocate kernel channel */ |
80 | lkc = trace_create_kernel_channel(); | |
81 | if (lkc == NULL) { | |
20fe2104 DG |
82 | goto error; |
83 | } | |
84 | ||
54012638 DG |
85 | /* Kernel tracer channel creation */ |
86 | ret = kernctl_create_channel(session->fd, lkc->channel); | |
20fe2104 | 87 | if (ret < 0) { |
54012638 | 88 | perror("ioctl kernel create channel"); |
20fe2104 DG |
89 | goto error; |
90 | } | |
91 | ||
54012638 | 92 | /* Setup the channel fd */ |
20fe2104 | 93 | lkc->fd = ret; |
54012638 | 94 | /* Add channel to session */ |
8c0faa1d DG |
95 | cds_list_add(&lkc->list, &session->channel_list.head); |
96 | session->channel_count++; | |
20fe2104 | 97 | |
54012638 | 98 | DBG("Kernel channel created (fd: %d and path: %s)", lkc->fd, lkc->pathname); |
20fe2104 DG |
99 | |
100 | return 0; | |
101 | ||
102 | error: | |
54012638 | 103 | return -1; |
20fe2104 | 104 | } |
f34daff7 DG |
105 | |
106 | /* | |
107 | * kernel_enable_event | |
108 | * | |
54012638 DG |
109 | * Create a kernel event, enable it to the kernel tracer and add it to the |
110 | * channel event list of the kernel session. | |
f34daff7 | 111 | */ |
8c0faa1d | 112 | int kernel_enable_event(struct ltt_kernel_session *session, char *name) |
f34daff7 DG |
113 | { |
114 | int ret; | |
8c0faa1d | 115 | struct ltt_kernel_channel *chan; |
f34daff7 | 116 | struct ltt_kernel_event *event; |
f34daff7 | 117 | |
54012638 DG |
118 | event = trace_create_kernel_event(name, LTTNG_KERNEL_TRACEPOINTS); |
119 | if (event == NULL) { | |
f34daff7 DG |
120 | goto error; |
121 | } | |
122 | ||
8c0faa1d | 123 | cds_list_for_each_entry(chan, &session->channel_list.head, list) { |
54012638 | 124 | ret = kernctl_create_event(chan->fd, event->event); |
8c0faa1d DG |
125 | if (ret < 0) { |
126 | goto error; | |
127 | } | |
f34daff7 | 128 | |
8c0faa1d DG |
129 | event->fd = ret; |
130 | /* Add event to event list */ | |
131 | cds_list_add(&event->list, &chan->events_list.head); | |
132 | DBG("Event %s enabled (fd: %d)", name, event->fd); | |
133 | } | |
f34daff7 DG |
134 | |
135 | return 0; | |
136 | ||
137 | error: | |
54012638 | 138 | return -1; |
f34daff7 | 139 | } |
aaf26714 DG |
140 | |
141 | /* | |
142 | * kernel_open_metadata | |
143 | * | |
54012638 DG |
144 | * Create kernel metadata, open from the kernel tracer and add it to the |
145 | * kernel session. | |
aaf26714 DG |
146 | */ |
147 | int kernel_open_metadata(struct ltt_kernel_session *session) | |
148 | { | |
149 | int ret; | |
150 | struct ltt_kernel_metadata *lkm; | |
aaf26714 | 151 | |
54012638 DG |
152 | /* Allocate kernel metadata */ |
153 | lkm = trace_create_kernel_metadata(); | |
154 | if (lkm == NULL) { | |
aaf26714 DG |
155 | goto error; |
156 | } | |
157 | ||
54012638 DG |
158 | /* Kernel tracer metadata creation */ |
159 | ret = kernctl_open_metadata(session->fd, lkm->conf); | |
aaf26714 DG |
160 | if (ret < 0) { |
161 | goto error; | |
162 | } | |
163 | ||
8c0faa1d | 164 | lkm->fd = ret; |
aaf26714 | 165 | session->metadata = lkm; |
8c0faa1d | 166 | |
54012638 | 167 | DBG("Kernel metadata opened (fd: %d and path: %s)", lkm->fd, lkm->pathname); |
8c0faa1d DG |
168 | |
169 | return 0; | |
170 | ||
171 | error: | |
54012638 | 172 | return -1; |
8c0faa1d DG |
173 | } |
174 | ||
175 | /* | |
176 | * kernel_start_session | |
177 | * | |
178 | * Start tracing session. | |
179 | */ | |
180 | int kernel_start_session(struct ltt_kernel_session *session) | |
181 | { | |
182 | int ret; | |
183 | ||
184 | ret = kernctl_start_session(session->fd); | |
185 | if (ret < 0) { | |
186 | goto error; | |
187 | } | |
188 | ||
189 | DBG("Kernel session started"); | |
190 | ||
191 | return 0; | |
192 | ||
193 | error: | |
194 | return ret; | |
195 | } | |
196 | ||
197 | /* | |
198 | * kernel_stop_session | |
199 | * | |
200 | * Stop tracing session. | |
201 | */ | |
202 | int kernel_stop_session(struct ltt_kernel_session *session) | |
203 | { | |
204 | int ret; | |
205 | ||
206 | ret = kernctl_stop_session(session->fd); | |
207 | if (ret < 0) { | |
208 | goto error; | |
209 | } | |
210 | ||
211 | DBG("Kernel session stopped"); | |
212 | ||
213 | return 0; | |
214 | ||
215 | error: | |
216 | return ret; | |
217 | } | |
218 | ||
219 | /* | |
220 | * kernel_create_channel_stream | |
221 | * | |
54012638 DG |
222 | * Create a stream for a channel, register it to the kernel tracer and add it |
223 | * to the stream list of the channel. | |
8c0faa1d DG |
224 | * |
225 | * Return the number of created stream. Else, a negative value. | |
226 | */ | |
227 | int kernel_create_channel_stream(struct ltt_kernel_channel *channel) | |
228 | { | |
229 | int ret; | |
230 | struct ltt_kernel_stream *lks; | |
231 | ||
232 | while ((ret = kernctl_create_stream(channel->fd)) > 0) { | |
54012638 | 233 | lks = trace_create_kernel_stream(); |
8c0faa1d | 234 | if (lks == NULL) { |
54012638 | 235 | close(ret); |
8c0faa1d DG |
236 | goto error; |
237 | } | |
238 | ||
239 | lks->fd = ret; | |
240 | ret = asprintf(&lks->pathname, "%s/trace_%d", | |
241 | channel->pathname, channel->stream_count); | |
242 | if (ret < 0) { | |
243 | perror("asprintf kernel create stream"); | |
244 | goto error; | |
245 | } | |
8c0faa1d | 246 | |
54012638 | 247 | /* Add stream to channe stream list */ |
8c0faa1d DG |
248 | cds_list_add(&lks->list, &channel->stream_list.head); |
249 | channel->stream_count++; | |
8c0faa1d | 250 | |
54012638 DG |
251 | DBG("Kernel stream %d created (fd: %d, state: %d, path: %s)", |
252 | channel->stream_count, lks->fd, lks->state, lks->pathname); | |
253 | } | |
8c0faa1d DG |
254 | |
255 | return channel->stream_count; | |
256 | ||
257 | error: | |
54012638 | 258 | return -1; |
8c0faa1d DG |
259 | } |
260 | ||
261 | /* | |
262 | * kernel_create_metadata_stream | |
263 | * | |
54012638 | 264 | * Create the metadata stream and set it to the kernel session. |
8c0faa1d DG |
265 | */ |
266 | int kernel_create_metadata_stream(struct ltt_kernel_session *session) | |
267 | { | |
268 | int ret; | |
269 | ||
270 | ret = kernctl_create_stream(session->metadata->fd); | |
271 | if (ret < 0) { | |
272 | perror("kernel create metadata stream"); | |
8c0faa1d DG |
273 | goto error; |
274 | } | |
275 | ||
276 | DBG("Kernel metadata stream created (fd: %d)", ret); | |
277 | session->metadata_stream_fd = ret; | |
aaf26714 DG |
278 | |
279 | return 0; | |
280 | ||
281 | error: | |
54012638 | 282 | return -1; |
aaf26714 | 283 | } |
2ef84c95 DG |
284 | |
285 | /* | |
286 | * kernel_list_events | |
287 | * | |
288 | * Get the event list from the kernel tracer and return that list in the CTF | |
289 | * format. | |
290 | */ | |
291 | ssize_t kernel_list_events(int tracer_fd, char **list) | |
292 | { | |
293 | int fd; | |
294 | char *buf, *line = NULL; | |
295 | size_t nb, nbmem, total = 0; | |
296 | ssize_t size; | |
297 | FILE *fp; | |
298 | ||
299 | fd = kernctl_tracepoint_list(tracer_fd); | |
300 | if (fd < 0) { | |
301 | perror("kernel tracepoint list"); | |
302 | goto error; | |
303 | } | |
304 | ||
305 | fp = fdopen(fd, "r"); | |
306 | if (fp == NULL) { | |
307 | perror("kernel tracepoint list fdopen"); | |
308 | goto error; | |
309 | } | |
310 | ||
311 | /* | |
312 | * Init memory size counter | |
313 | * See kernel-ctl.h for explanation of this value | |
314 | */ | |
315 | nbmem = KERNEL_EVENT_LIST_SIZE; | |
316 | buf = malloc(nbmem); | |
317 | ||
318 | while ((size = getline(&line, &nb, fp)) != -1) { | |
319 | if (total + size > nbmem) { | |
320 | DBG("Reallocating event list from %ld to %ld bytes", nbmem, | |
321 | total + size + KERNEL_EVENT_LIST_SIZE); | |
322 | /* Adding the default size again */ | |
323 | nbmem = total + size + KERNEL_EVENT_LIST_SIZE; | |
324 | buf = realloc(buf, nbmem); | |
325 | if (buf == NULL) { | |
326 | perror("realloc list events"); | |
327 | goto error; | |
328 | } | |
329 | } | |
330 | memcpy(buf + total, line, size); | |
331 | total += size; | |
332 | } | |
333 | ||
334 | *list = buf; | |
335 | ||
336 | DBG("Kernel list events done"); | |
337 | ||
338 | return total; | |
339 | ||
340 | error: | |
341 | return -1; | |
342 | } | |
343 |