Commit | Line | Data |
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d4a1283e JD |
1 | /* |
2 | * Copyright (C) 2011 - Julien Desfossez <julien.desfossez@polymtl.ca> | |
3 | * Mathieu Desnoyers <mathieu.desnoyers@efficios.com> | |
4 | * | |
5 | * This program is free software; you can redistribute it and/or | |
6 | * modify it under the terms of the GNU General Public License | |
82a3637f DG |
7 | * as published by the Free Software Foundation; only version 2 |
8 | * of the License. | |
d4a1283e JD |
9 | * |
10 | * This program is distributed in the hope that it will be useful, | |
11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
13 | * GNU General Public License for more details. | |
14 | * | |
15 | * You should have received a copy of the GNU General Public License | |
16 | * along with this program; if not, write to the Free Software | |
17 | * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. | |
18 | */ | |
19 | ||
20 | #define _GNU_SOURCE | |
21 | #include <fcntl.h> | |
22 | #include <getopt.h> | |
23 | #include <grp.h> | |
24 | #include <limits.h> | |
25 | #include <pthread.h> | |
26 | #include <signal.h> | |
27 | #include <stdio.h> | |
28 | #include <stdlib.h> | |
29 | #include <string.h> | |
30 | #include <sys/ipc.h> | |
31 | #include <sys/shm.h> | |
32 | #include <sys/socket.h> | |
33 | #include <sys/stat.h> | |
34 | #include <sys/types.h> | |
35 | #include <urcu/list.h> | |
36 | #include <poll.h> | |
37 | #include <unistd.h> | |
03424a9b | 38 | #include <sys/mman.h> |
5348b470 | 39 | #include <assert.h> |
3bd1e081 | 40 | #include <config.h> |
d4a1283e | 41 | |
3bd1e081 | 42 | #include <lttng-consumerd.h> |
1e307fab DG |
43 | #include <lttng-kernel-ctl.h> |
44 | #include <lttng-sessiond-comm.h> | |
3bd1e081 MD |
45 | #include <lttng/lttng-kconsumer.h> |
46 | #include <lttng/lttng-ustconsumer.h> | |
1e307fab | 47 | #include <lttngerr.h> |
d4a1283e | 48 | |
3bd1e081 MD |
49 | /* TODO : support UST (all direct kernctl accesses). */ |
50 | ||
d4a1283e | 51 | /* the two threads (receive fd and poll) */ |
6533b585 | 52 | static pthread_t threads[2]; |
d4a1283e | 53 | |
13e44745 JD |
54 | /* to count the number of time the user pressed ctrl+c */ |
55 | static int sigintcount = 0; | |
56 | ||
d4a1283e JD |
57 | /* Argument variables */ |
58 | int opt_quiet; | |
59 | int opt_verbose; | |
60 | static int opt_daemon; | |
61 | static const char *progname; | |
6533b585 DG |
62 | static char command_sock_path[PATH_MAX]; /* Global command socket path */ |
63 | static char error_sock_path[PATH_MAX]; /* Global error path */ | |
3bd1e081 | 64 | static enum lttng_consumer_type opt_type = LTTNG_CONSUMER_KERNEL; |
d4a1283e | 65 | |
6533b585 | 66 | /* the liblttngkconsumerd context */ |
3bd1e081 | 67 | static struct lttng_consumer_local_data *ctx; |
cb040cc1 | 68 | |
d4a1283e | 69 | /* |
6533b585 | 70 | * Signal handler for the daemon |
d4a1283e JD |
71 | */ |
72 | static void sighandler(int sig) | |
73 | { | |
13e44745 JD |
74 | if (sig == SIGINT && sigintcount++ == 0) { |
75 | DBG("ignoring first SIGINT"); | |
76 | return; | |
77 | } | |
78 | ||
3bd1e081 | 79 | lttng_consumer_should_exit(ctx); |
d4a1283e JD |
80 | } |
81 | ||
82 | /* | |
6533b585 | 83 | * Setup signal handler for : |
d4a1283e JD |
84 | * SIGINT, SIGTERM, SIGPIPE |
85 | */ | |
86 | static int set_signal_handler(void) | |
87 | { | |
88 | int ret = 0; | |
89 | struct sigaction sa; | |
90 | sigset_t sigset; | |
91 | ||
92 | if ((ret = sigemptyset(&sigset)) < 0) { | |
93 | perror("sigemptyset"); | |
94 | return ret; | |
95 | } | |
96 | ||
97 | sa.sa_handler = sighandler; | |
98 | sa.sa_mask = sigset; | |
99 | sa.sa_flags = 0; | |
100 | if ((ret = sigaction(SIGTERM, &sa, NULL)) < 0) { | |
101 | perror("sigaction"); | |
102 | return ret; | |
103 | } | |
104 | ||
105 | if ((ret = sigaction(SIGINT, &sa, NULL)) < 0) { | |
106 | perror("sigaction"); | |
107 | return ret; | |
108 | } | |
109 | ||
110 | if ((ret = sigaction(SIGPIPE, &sa, NULL)) < 0) { | |
111 | perror("sigaction"); | |
112 | return ret; | |
113 | } | |
114 | ||
115 | return ret; | |
116 | } | |
117 | ||
d4a1283e JD |
118 | /* |
119 | * usage function on stderr | |
120 | */ | |
121 | static void usage(void) | |
122 | { | |
123 | fprintf(stderr, "Usage: %s OPTIONS\n\nOptions:\n", progname); | |
124 | fprintf(stderr, " -h, --help " | |
125 | "Display this usage.\n"); | |
126 | fprintf(stderr, " -c, --kconsumerd-cmd-sock PATH " | |
127 | "Specify path for the command socket\n"); | |
128 | fprintf(stderr, " -e, --kconsumerd-err-sock PATH " | |
129 | "Specify path for the error socket\n"); | |
130 | fprintf(stderr, " -d, --daemonize " | |
131 | "Start as a daemon.\n"); | |
132 | fprintf(stderr, " -q, --quiet " | |
133 | "No output at all.\n"); | |
134 | fprintf(stderr, " -v, --verbose " | |
135 | "Verbose mode. Activate DBG() macro.\n"); | |
136 | fprintf(stderr, " -V, --version " | |
137 | "Show version number.\n"); | |
3bd1e081 MD |
138 | fprintf(stderr, " -k, --kernel " |
139 | "Consumer kernel buffers (default).\n"); | |
140 | fprintf(stderr, " -u, --ust " | |
141 | "Consumer UST buffers.%s\n", | |
142 | #ifdef CONFIG_LTTNG_TOOLS_HAVE_UST | |
143 | "" | |
144 | #else | |
145 | " (support not compiled in)" | |
146 | #endif | |
147 | ); | |
d4a1283e JD |
148 | } |
149 | ||
150 | /* | |
151 | * daemon argument parsing | |
152 | */ | |
153 | static void parse_args(int argc, char **argv) | |
154 | { | |
155 | int c; | |
156 | ||
157 | static struct option long_options[] = { | |
158 | { "kconsumerd-cmd-sock", 1, 0, 'c' }, | |
159 | { "kconsumerd-err-sock", 1, 0, 'e' }, | |
160 | { "daemonize", 0, 0, 'd' }, | |
161 | { "help", 0, 0, 'h' }, | |
162 | { "quiet", 0, 0, 'q' }, | |
163 | { "verbose", 0, 0, 'v' }, | |
164 | { "version", 0, 0, 'V' }, | |
3bd1e081 MD |
165 | { "kernel", 0, 0, 'k' }, |
166 | #ifdef CONFIG_LTTNG_TOOLS_HAVE_UST | |
167 | { "ust", 0, 0, 'u' }, | |
168 | #endif | |
d4a1283e JD |
169 | { NULL, 0, 0, 0 } |
170 | }; | |
171 | ||
172 | while (1) { | |
173 | int option_index = 0; | |
3bd1e081 | 174 | c = getopt_long(argc, argv, "dhqvVku" "c:e:", long_options, &option_index); |
d4a1283e JD |
175 | if (c == -1) { |
176 | break; | |
177 | } | |
178 | ||
179 | switch (c) { | |
914a571b JD |
180 | case 0: |
181 | fprintf(stderr, "option %s", long_options[option_index].name); | |
182 | if (optarg) { | |
183 | fprintf(stderr, " with arg %s\n", optarg); | |
184 | } | |
185 | break; | |
186 | case 'c': | |
187 | snprintf(command_sock_path, PATH_MAX, "%s", optarg); | |
188 | break; | |
189 | case 'e': | |
190 | snprintf(error_sock_path, PATH_MAX, "%s", optarg); | |
191 | break; | |
192 | case 'd': | |
193 | opt_daemon = 1; | |
194 | break; | |
195 | case 'h': | |
196 | usage(); | |
197 | exit(EXIT_FAILURE); | |
198 | case 'q': | |
199 | opt_quiet = 1; | |
200 | break; | |
201 | case 'v': | |
202 | opt_verbose = 1; | |
203 | break; | |
204 | case 'V': | |
205 | fprintf(stdout, "%s\n", VERSION); | |
206 | exit(EXIT_SUCCESS); | |
3bd1e081 MD |
207 | case 'k': |
208 | opt_type = LTTNG_CONSUMER_KERNEL; | |
209 | break; | |
210 | #ifdef CONFIG_LTTNG_TOOLS_HAVE_UST | |
211 | case 'u': | |
212 | opt_type = LTTNG_CONSUMER_UST; | |
213 | break; | |
214 | #endif | |
914a571b JD |
215 | default: |
216 | usage(); | |
217 | exit(EXIT_FAILURE); | |
d4a1283e JD |
218 | } |
219 | } | |
220 | } | |
221 | ||
cb040cc1 | 222 | /* |
6533b585 | 223 | * Consume data on a file descriptor and write it on a trace file. |
cb040cc1 | 224 | */ |
3bd1e081 | 225 | static int read_subbuffer(struct lttng_consumer_stream *stream) |
cb040cc1 JD |
226 | { |
227 | unsigned long len; | |
228 | int err; | |
229 | long ret = 0; | |
3bd1e081 | 230 | int infd = stream->wait_fd; |
cb040cc1 | 231 | |
3bd1e081 | 232 | DBG("In read_subbuffer (infd : %d)", infd); |
cb040cc1 JD |
233 | /* Get the next subbuffer */ |
234 | err = kernctl_get_next_subbuf(infd); | |
235 | if (err != 0) { | |
236 | ret = errno; | |
81ffcd20 MD |
237 | /* |
238 | * This is a debug message even for single-threaded consumer, | |
239 | * because poll() have more relaxed criterions than get subbuf, | |
240 | * so get_subbuf may fail for short race windows where poll() | |
241 | * would issue wakeups. | |
242 | */ | |
243 | DBG("Reserving sub buffer failed (everything is normal, " | |
cb040cc1 JD |
244 | "it is due to concurrency)"); |
245 | goto end; | |
246 | } | |
247 | ||
3bd1e081 | 248 | switch (stream->output) { |
cb040cc1 JD |
249 | case LTTNG_EVENT_SPLICE: |
250 | /* read the whole subbuffer */ | |
251 | err = kernctl_get_padded_subbuf_size(infd, &len); | |
252 | if (err != 0) { | |
253 | ret = errno; | |
254 | perror("Getting sub-buffer len failed."); | |
255 | goto end; | |
256 | } | |
257 | ||
258 | /* splice the subbuffer to the tracefile */ | |
3bd1e081 | 259 | ret = lttng_consumer_on_read_subbuffer_splice(ctx, stream, len); |
cb040cc1 JD |
260 | if (ret < 0) { |
261 | /* | |
262 | * display the error but continue processing to try | |
263 | * to release the subbuffer | |
264 | */ | |
265 | ERR("Error splicing to tracefile"); | |
266 | } | |
267 | break; | |
268 | case LTTNG_EVENT_MMAP: | |
269 | /* read the used subbuffer size */ | |
8b270bdb | 270 | err = kernctl_get_padded_subbuf_size(infd, &len); |
cb040cc1 JD |
271 | if (err != 0) { |
272 | ret = errno; | |
273 | perror("Getting sub-buffer len failed."); | |
274 | goto end; | |
275 | } | |
276 | /* write the subbuffer to the tracefile */ | |
3bd1e081 | 277 | ret = lttng_consumer_on_read_subbuffer_mmap(ctx, stream, len); |
cb040cc1 JD |
278 | if (ret < 0) { |
279 | /* | |
280 | * display the error but continue processing to try | |
281 | * to release the subbuffer | |
282 | */ | |
283 | ERR("Error writing to tracefile"); | |
284 | } | |
285 | break; | |
286 | default: | |
287 | ERR("Unknown output method"); | |
288 | ret = -1; | |
289 | } | |
290 | ||
291 | err = kernctl_put_next_subbuf(infd); | |
292 | if (err != 0) { | |
293 | ret = errno; | |
294 | if (errno == EFAULT) { | |
295 | perror("Error in unreserving sub buffer\n"); | |
296 | } else if (errno == EIO) { | |
297 | /* Should never happen with newer LTTng versions */ | |
298 | perror("Reader has been pushed by the writer, last sub-buffer corrupted."); | |
299 | } | |
300 | goto end; | |
301 | } | |
302 | ||
303 | end: | |
304 | return ret; | |
305 | } | |
d4a1283e | 306 | |
3bd1e081 | 307 | static int on_recv_stream(struct lttng_consumer_stream *stream) |
5348b470 JD |
308 | { |
309 | int ret; | |
310 | ||
311 | /* Opening the tracefile in write mode */ | |
3bd1e081 MD |
312 | if (stream->path_name != NULL) { |
313 | ret = open(stream->path_name, | |
5348b470 JD |
314 | O_WRONLY|O_CREAT|O_TRUNC, S_IRWXU|S_IRWXG|S_IRWXO); |
315 | if (ret < 0) { | |
3bd1e081 | 316 | ERR("Opening %s", stream->path_name); |
5348b470 JD |
317 | perror("open"); |
318 | goto error; | |
319 | } | |
3bd1e081 | 320 | stream->out_fd = ret; |
5348b470 JD |
321 | } |
322 | ||
3bd1e081 | 323 | if (stream->output == LTTNG_EVENT_MMAP) { |
5348b470 | 324 | /* get the len of the mmap region */ |
558e70e9 MD |
325 | unsigned long mmap_len; |
326 | ||
3bd1e081 | 327 | ret = kernctl_get_mmap_len(stream->wait_fd, &mmap_len); |
5348b470 JD |
328 | if (ret != 0) { |
329 | ret = errno; | |
330 | perror("kernctl_get_mmap_len"); | |
331 | goto error_close_fd; | |
332 | } | |
3bd1e081 | 333 | stream->mmap_len = (size_t) mmap_len; |
5348b470 | 334 | |
3bd1e081 MD |
335 | stream->mmap_base = mmap(NULL, stream->mmap_len, |
336 | PROT_READ, MAP_PRIVATE, stream->wait_fd, 0); | |
337 | if (stream->mmap_base == MAP_FAILED) { | |
5348b470 JD |
338 | perror("Error mmaping"); |
339 | ret = -1; | |
340 | goto error_close_fd; | |
341 | } | |
342 | } | |
343 | ||
344 | /* we return 0 to let the library handle the FD internally */ | |
345 | return 0; | |
346 | ||
347 | error_close_fd: | |
348 | { | |
349 | int err; | |
350 | ||
3bd1e081 | 351 | err = close(stream->out_fd); |
5348b470 JD |
352 | assert(!err); |
353 | } | |
354 | error: | |
355 | return ret; | |
356 | } | |
357 | ||
d4a1283e JD |
358 | /* |
359 | * main | |
360 | */ | |
361 | int main(int argc, char **argv) | |
362 | { | |
363 | int i; | |
364 | int ret = 0; | |
365 | void *status; | |
366 | ||
367 | /* Parse arguments */ | |
368 | progname = argv[0]; | |
369 | parse_args(argc, argv); | |
370 | ||
371 | /* Daemonize */ | |
372 | if (opt_daemon) { | |
373 | ret = daemon(0, 0); | |
374 | if (ret < 0) { | |
375 | perror("daemon"); | |
376 | goto error; | |
377 | } | |
378 | } | |
379 | ||
380 | if (strlen(command_sock_path) == 0) { | |
381 | snprintf(command_sock_path, PATH_MAX, | |
3bd1e081 MD |
382 | opt_type == LTTNG_CONSUMER_KERNEL ? |
383 | KCONSUMERD_CMD_SOCK_PATH : | |
384 | USTCONSUMERD_CMD_SOCK_PATH); | |
d4a1283e | 385 | } |
5348b470 | 386 | /* create the consumer instance with and assign the callbacks */ |
3bd1e081 | 387 | ctx = lttng_consumer_create(opt_type, read_subbuffer, NULL, on_recv_stream, NULL); |
cb040cc1 JD |
388 | if (ctx == NULL) { |
389 | goto error; | |
390 | } | |
391 | ||
3bd1e081 | 392 | lttng_consumer_set_command_sock_path(ctx, command_sock_path); |
d4a1283e JD |
393 | if (strlen(error_sock_path) == 0) { |
394 | snprintf(error_sock_path, PATH_MAX, | |
3bd1e081 MD |
395 | opt_type == LTTNG_CONSUMER_KERNEL ? |
396 | KCONSUMERD_ERR_SOCK_PATH : | |
397 | USTCONSUMERD_ERR_SOCK_PATH); | |
d4a1283e JD |
398 | } |
399 | ||
400 | if (set_signal_handler() < 0) { | |
401 | goto error; | |
402 | } | |
403 | ||
404 | /* Connect to the socket created by ltt-sessiond to report errors */ | |
405 | DBG("Connecting to error socket %s", error_sock_path); | |
1ce86c9a | 406 | ret = lttcomm_connect_unix_sock(error_sock_path); |
d4a1283e | 407 | /* not a fatal error, but all communication with ltt-sessiond will fail */ |
1ce86c9a | 408 | if (ret < 0) { |
d4a1283e JD |
409 | WARN("Cannot connect to error socket, is ltt-sessiond started ?"); |
410 | } | |
3bd1e081 | 411 | lttng_consumer_set_error_sock(ctx, ret); |
d4a1283e JD |
412 | |
413 | /* Create the thread to manage the receive of fd */ | |
3bd1e081 | 414 | ret = pthread_create(&threads[0], NULL, lttng_consumer_thread_receive_fds, |
cb040cc1 | 415 | (void *) ctx); |
d4a1283e JD |
416 | if (ret != 0) { |
417 | perror("pthread_create"); | |
418 | goto error; | |
419 | } | |
420 | ||
421 | /* Create thread to manage the polling/writing of traces */ | |
3bd1e081 | 422 | ret = pthread_create(&threads[1], NULL, lttng_consumer_thread_poll_fds, |
cb040cc1 | 423 | (void *) ctx); |
d4a1283e JD |
424 | if (ret != 0) { |
425 | perror("pthread_create"); | |
426 | goto error; | |
427 | } | |
428 | ||
429 | for (i = 0; i < 2; i++) { | |
430 | ret = pthread_join(threads[i], &status); | |
431 | if (ret != 0) { | |
432 | perror("pthread_join"); | |
433 | goto error; | |
434 | } | |
435 | } | |
436 | ret = EXIT_SUCCESS; | |
3bd1e081 | 437 | lttng_consumer_send_error(ctx, CONSUMERD_EXIT_SUCCESS); |
d4a1283e JD |
438 | goto end; |
439 | ||
440 | error: | |
441 | ret = EXIT_FAILURE; | |
3bd1e081 | 442 | lttng_consumer_send_error(ctx, CONSUMERD_EXIT_FAILURE); |
d4a1283e JD |
443 | |
444 | end: | |
3bd1e081 MD |
445 | lttng_consumer_destroy(ctx); |
446 | lttng_consumer_cleanup(); | |
d4a1283e JD |
447 | |
448 | return ret; | |
449 | } |