Commit | Line | Data |
---|---|---|
d4a1283e JD |
1 | /* |
2 | * Copyright (C) 2011 - Julien Desfossez <julien.desfossez@polymtl.ca> | |
3 | * Mathieu Desnoyers <mathieu.desnoyers@efficios.com> | |
4 | * | |
d14d33bf AM |
5 | * This program is free software; you can redistribute it and/or modify |
6 | * it under the terms of the GNU General Public License, version 2 only, | |
7 | * as published by the Free Software Foundation. | |
d4a1283e JD |
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 | * | |
d14d33bf AM |
14 | * You should have received a copy of the GNU General Public License along |
15 | * with this program; if not, write to the Free Software Foundation, Inc., | |
16 | * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. | |
d4a1283e JD |
17 | */ |
18 | ||
19 | #define _GNU_SOURCE | |
20 | #include <fcntl.h> | |
21 | #include <getopt.h> | |
22 | #include <grp.h> | |
23 | #include <limits.h> | |
24 | #include <pthread.h> | |
25 | #include <signal.h> | |
26 | #include <stdio.h> | |
27 | #include <stdlib.h> | |
28 | #include <string.h> | |
29 | #include <sys/ipc.h> | |
1ccfc0e3 | 30 | #include <sys/resource.h> |
d4a1283e JD |
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> |
7753dea8 | 41 | #include <urcu/compiler.h> |
1ccfc0e3 | 42 | #include <ulimit.h> |
d4a1283e | 43 | |
db758600 DG |
44 | #include <common/defaults.h> |
45 | #include <common/common.h> | |
f02e1e8a | 46 | #include <common/consumer.h> |
fb3a43a9 | 47 | #include <common/compat/poll.h> |
10a8a223 | 48 | #include <common/sessiond-comm/sessiond-comm.h> |
10a8a223 DG |
49 | |
50 | #include "lttng-consumerd.h" | |
d4a1283e | 51 | |
99bab54f | 52 | /* TODO : support UST (all direct kernel-ctl accesses). */ |
3bd1e081 | 53 | |
fb3a43a9 | 54 | /* the two threads (receive fd, poll and metadata) */ |
df27ef7b | 55 | static pthread_t data_thread, metadata_thread, sessiond_thread; |
d4a1283e | 56 | |
3183dbb0 | 57 | /* to count the number of times the user pressed ctrl+c */ |
13e44745 JD |
58 | static int sigintcount = 0; |
59 | ||
d4a1283e | 60 | /* Argument variables */ |
97e19046 DG |
61 | int lttng_opt_quiet; /* not static in error.h */ |
62 | int lttng_opt_verbose; /* not static in error.h */ | |
d4a1283e JD |
63 | static int opt_daemon; |
64 | static const char *progname; | |
6533b585 DG |
65 | static char command_sock_path[PATH_MAX]; /* Global command socket path */ |
66 | static char error_sock_path[PATH_MAX]; /* Global error path */ | |
3bd1e081 | 67 | static enum lttng_consumer_type opt_type = LTTNG_CONSUMER_KERNEL; |
d4a1283e | 68 | |
7753dea8 | 69 | /* the liblttngconsumerd context */ |
3bd1e081 | 70 | static struct lttng_consumer_local_data *ctx; |
cb040cc1 | 71 | |
d4a1283e | 72 | /* |
6533b585 | 73 | * Signal handler for the daemon |
d4a1283e JD |
74 | */ |
75 | static void sighandler(int sig) | |
76 | { | |
13e44745 JD |
77 | if (sig == SIGINT && sigintcount++ == 0) { |
78 | DBG("ignoring first SIGINT"); | |
79 | return; | |
80 | } | |
81 | ||
3bd1e081 | 82 | lttng_consumer_should_exit(ctx); |
d4a1283e JD |
83 | } |
84 | ||
85 | /* | |
6533b585 | 86 | * Setup signal handler for : |
d4a1283e JD |
87 | * SIGINT, SIGTERM, SIGPIPE |
88 | */ | |
89 | static int set_signal_handler(void) | |
90 | { | |
91 | int ret = 0; | |
92 | struct sigaction sa; | |
93 | sigset_t sigset; | |
94 | ||
95 | if ((ret = sigemptyset(&sigset)) < 0) { | |
96 | perror("sigemptyset"); | |
97 | return ret; | |
98 | } | |
99 | ||
100 | sa.sa_handler = sighandler; | |
101 | sa.sa_mask = sigset; | |
102 | sa.sa_flags = 0; | |
103 | if ((ret = sigaction(SIGTERM, &sa, NULL)) < 0) { | |
104 | perror("sigaction"); | |
105 | return ret; | |
106 | } | |
107 | ||
108 | if ((ret = sigaction(SIGINT, &sa, NULL)) < 0) { | |
109 | perror("sigaction"); | |
110 | return ret; | |
111 | } | |
112 | ||
113 | if ((ret = sigaction(SIGPIPE, &sa, NULL)) < 0) { | |
114 | perror("sigaction"); | |
115 | return ret; | |
116 | } | |
117 | ||
118 | return ret; | |
119 | } | |
120 | ||
d4a1283e | 121 | /* |
3183dbb0 | 122 | * Usage function on stream file. |
d4a1283e | 123 | */ |
3183dbb0 | 124 | static void usage(FILE *fp) |
d4a1283e | 125 | { |
3183dbb0 DG |
126 | fprintf(fp, "Usage: %s OPTIONS\n\nOptions:\n", progname); |
127 | fprintf(fp, " -h, --help " | |
d4a1283e | 128 | "Display this usage.\n"); |
3183dbb0 | 129 | fprintf(fp, " -c, --consumerd-cmd-sock PATH " |
d4a1283e | 130 | "Specify path for the command socket\n"); |
3183dbb0 | 131 | fprintf(fp, " -e, --consumerd-err-sock PATH " |
d4a1283e | 132 | "Specify path for the error socket\n"); |
3183dbb0 | 133 | fprintf(fp, " -d, --daemonize " |
d4a1283e | 134 | "Start as a daemon.\n"); |
3183dbb0 | 135 | fprintf(fp, " -q, --quiet " |
d4a1283e | 136 | "No output at all.\n"); |
3183dbb0 | 137 | fprintf(fp, " -v, --verbose " |
d4a1283e | 138 | "Verbose mode. Activate DBG() macro.\n"); |
3183dbb0 | 139 | fprintf(fp, " -V, --version " |
d4a1283e | 140 | "Show version number.\n"); |
3183dbb0 | 141 | fprintf(fp, " -k, --kernel " |
3bd1e081 | 142 | "Consumer kernel buffers (default).\n"); |
3183dbb0 | 143 | fprintf(fp, " -u, --ust " |
3bd1e081 | 144 | "Consumer UST buffers.%s\n", |
74d0b642 | 145 | #ifdef HAVE_LIBLTTNG_UST_CTL |
3bd1e081 MD |
146 | "" |
147 | #else | |
148 | " (support not compiled in)" | |
149 | #endif | |
150 | ); | |
d4a1283e JD |
151 | } |
152 | ||
153 | /* | |
154 | * daemon argument parsing | |
155 | */ | |
156 | static void parse_args(int argc, char **argv) | |
157 | { | |
158 | int c; | |
159 | ||
160 | static struct option long_options[] = { | |
7753dea8 MD |
161 | { "consumerd-cmd-sock", 1, 0, 'c' }, |
162 | { "consumerd-err-sock", 1, 0, 'e' }, | |
d4a1283e JD |
163 | { "daemonize", 0, 0, 'd' }, |
164 | { "help", 0, 0, 'h' }, | |
165 | { "quiet", 0, 0, 'q' }, | |
166 | { "verbose", 0, 0, 'v' }, | |
167 | { "version", 0, 0, 'V' }, | |
3bd1e081 | 168 | { "kernel", 0, 0, 'k' }, |
74d0b642 | 169 | #ifdef HAVE_LIBLTTNG_UST_CTL |
3bd1e081 MD |
170 | { "ust", 0, 0, 'u' }, |
171 | #endif | |
d4a1283e JD |
172 | { NULL, 0, 0, 0 } |
173 | }; | |
174 | ||
175 | while (1) { | |
176 | int option_index = 0; | |
3bd1e081 | 177 | c = getopt_long(argc, argv, "dhqvVku" "c:e:", long_options, &option_index); |
d4a1283e JD |
178 | if (c == -1) { |
179 | break; | |
180 | } | |
181 | ||
182 | switch (c) { | |
914a571b JD |
183 | case 0: |
184 | fprintf(stderr, "option %s", long_options[option_index].name); | |
185 | if (optarg) { | |
186 | fprintf(stderr, " with arg %s\n", optarg); | |
187 | } | |
188 | break; | |
189 | case 'c': | |
190 | snprintf(command_sock_path, PATH_MAX, "%s", optarg); | |
191 | break; | |
192 | case 'e': | |
193 | snprintf(error_sock_path, PATH_MAX, "%s", optarg); | |
194 | break; | |
195 | case 'd': | |
196 | opt_daemon = 1; | |
197 | break; | |
198 | case 'h': | |
3183dbb0 DG |
199 | usage(stdout); |
200 | exit(EXIT_SUCCESS); | |
914a571b | 201 | case 'q': |
97e19046 | 202 | lttng_opt_quiet = 1; |
914a571b JD |
203 | break; |
204 | case 'v': | |
97e19046 | 205 | lttng_opt_verbose = 1; |
914a571b JD |
206 | break; |
207 | case 'V': | |
208 | fprintf(stdout, "%s\n", VERSION); | |
209 | exit(EXIT_SUCCESS); | |
3bd1e081 MD |
210 | case 'k': |
211 | opt_type = LTTNG_CONSUMER_KERNEL; | |
212 | break; | |
74d0b642 | 213 | #ifdef HAVE_LIBLTTNG_UST_CTL |
3bd1e081 | 214 | case 'u': |
7753dea8 MD |
215 | # if (CAA_BITS_PER_LONG == 64) |
216 | opt_type = LTTNG_CONSUMER64_UST; | |
217 | # elif (CAA_BITS_PER_LONG == 32) | |
218 | opt_type = LTTNG_CONSUMER32_UST; | |
219 | # else | |
220 | # error "Unknown bitness" | |
221 | # endif | |
3bd1e081 MD |
222 | break; |
223 | #endif | |
914a571b | 224 | default: |
3183dbb0 | 225 | usage(stderr); |
914a571b | 226 | exit(EXIT_FAILURE); |
d4a1283e JD |
227 | } |
228 | } | |
229 | } | |
230 | ||
1ccfc0e3 DG |
231 | /* |
232 | * Set open files limit to unlimited. This daemon can open a large number of | |
233 | * file descriptors in order to consumer multiple kernel traces. | |
234 | */ | |
235 | static void set_ulimit(void) | |
236 | { | |
237 | int ret; | |
238 | struct rlimit lim; | |
239 | ||
240 | /* The kernel does not allowed an infinite limit for open files */ | |
241 | lim.rlim_cur = 65535; | |
242 | lim.rlim_max = 65535; | |
243 | ||
244 | ret = setrlimit(RLIMIT_NOFILE, &lim); | |
245 | if (ret < 0) { | |
246 | PERROR("failed to set open files limit"); | |
247 | } | |
248 | } | |
249 | ||
d4a1283e JD |
250 | /* |
251 | * main | |
252 | */ | |
253 | int main(int argc, char **argv) | |
254 | { | |
d4a1283e JD |
255 | int ret = 0; |
256 | void *status; | |
257 | ||
258 | /* Parse arguments */ | |
259 | progname = argv[0]; | |
260 | parse_args(argc, argv); | |
261 | ||
262 | /* Daemonize */ | |
263 | if (opt_daemon) { | |
ceed52b5 MD |
264 | int i; |
265 | ||
266 | /* | |
267 | * fork | |
268 | * child: setsid, close FD 0, 1, 2, chdir / | |
269 | * parent: exit (if fork is successful) | |
270 | */ | |
d4a1283e JD |
271 | ret = daemon(0, 0); |
272 | if (ret < 0) { | |
ceed52b5 | 273 | PERROR("daemon"); |
d4a1283e JD |
274 | goto error; |
275 | } | |
ceed52b5 MD |
276 | /* |
277 | * We are in the child. Make sure all other file | |
278 | * descriptors are closed, in case we are called with | |
279 | * more opened file descriptors than the standard ones. | |
280 | */ | |
281 | for (i = 3; i < sysconf(_SC_OPEN_MAX); i++) { | |
282 | (void) close(i); | |
283 | } | |
d4a1283e JD |
284 | } |
285 | ||
fb3a43a9 DG |
286 | /* Set up max poll set size */ |
287 | lttng_poll_set_max_size(); | |
288 | ||
d4a1283e | 289 | if (strlen(command_sock_path) == 0) { |
7753dea8 MD |
290 | switch (opt_type) { |
291 | case LTTNG_CONSUMER_KERNEL: | |
60922cb0 | 292 | snprintf(command_sock_path, PATH_MAX, DEFAULT_KCONSUMERD_CMD_SOCK_PATH, |
990570ed | 293 | DEFAULT_LTTNG_RUNDIR); |
7753dea8 MD |
294 | break; |
295 | case LTTNG_CONSUMER64_UST: | |
67e40797 | 296 | snprintf(command_sock_path, PATH_MAX, |
60922cb0 | 297 | DEFAULT_USTCONSUMERD64_CMD_SOCK_PATH, DEFAULT_LTTNG_RUNDIR); |
7753dea8 MD |
298 | break; |
299 | case LTTNG_CONSUMER32_UST: | |
67e40797 | 300 | snprintf(command_sock_path, PATH_MAX, |
60922cb0 | 301 | DEFAULT_USTCONSUMERD32_CMD_SOCK_PATH, DEFAULT_LTTNG_RUNDIR); |
7753dea8 MD |
302 | break; |
303 | default: | |
304 | WARN("Unknown consumerd type"); | |
305 | goto error; | |
306 | } | |
d4a1283e | 307 | } |
e4421fec DG |
308 | |
309 | /* Init */ | |
310 | lttng_consumer_init(); | |
311 | ||
1ccfc0e3 DG |
312 | if (!getuid()) { |
313 | /* Set limit for open files */ | |
314 | set_ulimit(); | |
315 | } | |
316 | ||
5348b470 | 317 | /* create the consumer instance with and assign the callbacks */ |
d41f73b7 MD |
318 | ctx = lttng_consumer_create(opt_type, lttng_consumer_read_subbuffer, |
319 | NULL, lttng_consumer_on_recv_stream, NULL); | |
cb040cc1 JD |
320 | if (ctx == NULL) { |
321 | goto error; | |
322 | } | |
323 | ||
3bd1e081 | 324 | lttng_consumer_set_command_sock_path(ctx, command_sock_path); |
d4a1283e | 325 | if (strlen(error_sock_path) == 0) { |
7753dea8 MD |
326 | switch (opt_type) { |
327 | case LTTNG_CONSUMER_KERNEL: | |
60922cb0 | 328 | snprintf(error_sock_path, PATH_MAX, DEFAULT_KCONSUMERD_ERR_SOCK_PATH, |
990570ed | 329 | DEFAULT_LTTNG_RUNDIR); |
7753dea8 MD |
330 | break; |
331 | case LTTNG_CONSUMER64_UST: | |
67e40797 | 332 | snprintf(error_sock_path, PATH_MAX, |
60922cb0 | 333 | DEFAULT_USTCONSUMERD64_ERR_SOCK_PATH, DEFAULT_LTTNG_RUNDIR); |
7753dea8 MD |
334 | break; |
335 | case LTTNG_CONSUMER32_UST: | |
67e40797 | 336 | snprintf(error_sock_path, PATH_MAX, |
60922cb0 | 337 | DEFAULT_USTCONSUMERD32_ERR_SOCK_PATH, DEFAULT_LTTNG_RUNDIR); |
7753dea8 MD |
338 | break; |
339 | default: | |
340 | WARN("Unknown consumerd type"); | |
341 | goto error; | |
342 | } | |
d4a1283e JD |
343 | } |
344 | ||
345 | if (set_signal_handler() < 0) { | |
346 | goto error; | |
347 | } | |
348 | ||
32258573 | 349 | /* Connect to the socket created by lttng-sessiond to report errors */ |
d4a1283e | 350 | DBG("Connecting to error socket %s", error_sock_path); |
1ce86c9a | 351 | ret = lttcomm_connect_unix_sock(error_sock_path); |
32258573 | 352 | /* not a fatal error, but all communication with lttng-sessiond will fail */ |
1ce86c9a | 353 | if (ret < 0) { |
99bab54f | 354 | WARN("Cannot connect to error socket (is lttng-sessiond started?)"); |
d4a1283e | 355 | } |
3bd1e081 | 356 | lttng_consumer_set_error_sock(ctx, ret); |
d4a1283e | 357 | |
7d980def | 358 | /* Create thread to manage the polling/writing of trace metadata */ |
df27ef7b | 359 | ret = pthread_create(&metadata_thread, NULL, consumer_thread_metadata_poll, |
7d980def DG |
360 | (void *) ctx); |
361 | if (ret != 0) { | |
362 | perror("pthread_create"); | |
363 | goto error; | |
364 | } | |
365 | ||
366 | /* Create thread to manage the polling/writing of trace data */ | |
df27ef7b | 367 | ret = pthread_create(&data_thread, NULL, consumer_thread_data_poll, |
cb040cc1 | 368 | (void *) ctx); |
d4a1283e JD |
369 | if (ret != 0) { |
370 | perror("pthread_create"); | |
df27ef7b | 371 | goto data_error; |
d4a1283e JD |
372 | } |
373 | ||
7d980def | 374 | /* Create the thread to manage the receive of fd */ |
df27ef7b | 375 | ret = pthread_create(&sessiond_thread, NULL, consumer_thread_sessiond_poll, |
cb040cc1 | 376 | (void *) ctx); |
d4a1283e JD |
377 | if (ret != 0) { |
378 | perror("pthread_create"); | |
df27ef7b DG |
379 | goto sessiond_error; |
380 | } | |
381 | ||
382 | ret = pthread_join(sessiond_thread, &status); | |
383 | if (ret != 0) { | |
384 | perror("pthread_join"); | |
d4a1283e JD |
385 | goto error; |
386 | } | |
387 | ||
df27ef7b DG |
388 | sessiond_error: |
389 | ret = pthread_join(data_thread, &status); | |
390 | if (ret != 0) { | |
391 | perror("pthread_join"); | |
392 | goto error; | |
393 | } | |
394 | ||
395 | data_error: | |
396 | ret = pthread_join(metadata_thread, &status); | |
397 | if (ret != 0) { | |
398 | perror("pthread_join"); | |
399 | goto error; | |
400 | } | |
401 | ||
402 | if (!ret) { | |
403 | ret = EXIT_SUCCESS; | |
404 | lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_EXIT_SUCCESS); | |
405 | goto end; | |
d4a1283e | 406 | } |
d4a1283e JD |
407 | |
408 | error: | |
409 | ret = EXIT_FAILURE; | |
f73fabfd | 410 | lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_EXIT_FAILURE); |
d4a1283e JD |
411 | |
412 | end: | |
3bd1e081 MD |
413 | lttng_consumer_destroy(ctx); |
414 | lttng_consumer_cleanup(); | |
d4a1283e JD |
415 | |
416 | return ret; | |
417 | } |