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 | ||
ab1027f4 DG |
82 | /* |
83 | * Ignore SIGPIPE because it should not stop the consumer whenever a | |
84 | * SIGPIPE is catched through a FD operation. | |
85 | */ | |
86 | if (sig == SIGPIPE) { | |
87 | return; | |
88 | } | |
89 | ||
3bd1e081 | 90 | lttng_consumer_should_exit(ctx); |
d4a1283e JD |
91 | } |
92 | ||
93 | /* | |
6533b585 | 94 | * Setup signal handler for : |
d4a1283e JD |
95 | * SIGINT, SIGTERM, SIGPIPE |
96 | */ | |
97 | static int set_signal_handler(void) | |
98 | { | |
99 | int ret = 0; | |
100 | struct sigaction sa; | |
101 | sigset_t sigset; | |
102 | ||
103 | if ((ret = sigemptyset(&sigset)) < 0) { | |
104 | perror("sigemptyset"); | |
105 | return ret; | |
106 | } | |
107 | ||
108 | sa.sa_handler = sighandler; | |
109 | sa.sa_mask = sigset; | |
110 | sa.sa_flags = 0; | |
111 | if ((ret = sigaction(SIGTERM, &sa, NULL)) < 0) { | |
112 | perror("sigaction"); | |
113 | return ret; | |
114 | } | |
115 | ||
116 | if ((ret = sigaction(SIGINT, &sa, NULL)) < 0) { | |
117 | perror("sigaction"); | |
118 | return ret; | |
119 | } | |
120 | ||
121 | if ((ret = sigaction(SIGPIPE, &sa, NULL)) < 0) { | |
122 | perror("sigaction"); | |
123 | return ret; | |
124 | } | |
125 | ||
126 | return ret; | |
127 | } | |
128 | ||
d4a1283e | 129 | /* |
3183dbb0 | 130 | * Usage function on stream file. |
d4a1283e | 131 | */ |
3183dbb0 | 132 | static void usage(FILE *fp) |
d4a1283e | 133 | { |
3183dbb0 DG |
134 | fprintf(fp, "Usage: %s OPTIONS\n\nOptions:\n", progname); |
135 | fprintf(fp, " -h, --help " | |
d4a1283e | 136 | "Display this usage.\n"); |
3183dbb0 | 137 | fprintf(fp, " -c, --consumerd-cmd-sock PATH " |
d4a1283e | 138 | "Specify path for the command socket\n"); |
3183dbb0 | 139 | fprintf(fp, " -e, --consumerd-err-sock PATH " |
d4a1283e | 140 | "Specify path for the error socket\n"); |
3183dbb0 | 141 | fprintf(fp, " -d, --daemonize " |
d4a1283e | 142 | "Start as a daemon.\n"); |
3183dbb0 | 143 | fprintf(fp, " -q, --quiet " |
d4a1283e | 144 | "No output at all.\n"); |
3183dbb0 | 145 | fprintf(fp, " -v, --verbose " |
d4a1283e | 146 | "Verbose mode. Activate DBG() macro.\n"); |
3183dbb0 | 147 | fprintf(fp, " -V, --version " |
d4a1283e | 148 | "Show version number.\n"); |
3183dbb0 | 149 | fprintf(fp, " -k, --kernel " |
3bd1e081 | 150 | "Consumer kernel buffers (default).\n"); |
3183dbb0 | 151 | fprintf(fp, " -u, --ust " |
3bd1e081 | 152 | "Consumer UST buffers.%s\n", |
74d0b642 | 153 | #ifdef HAVE_LIBLTTNG_UST_CTL |
3bd1e081 MD |
154 | "" |
155 | #else | |
156 | " (support not compiled in)" | |
157 | #endif | |
158 | ); | |
d4a1283e JD |
159 | } |
160 | ||
161 | /* | |
162 | * daemon argument parsing | |
163 | */ | |
164 | static void parse_args(int argc, char **argv) | |
165 | { | |
166 | int c; | |
167 | ||
168 | static struct option long_options[] = { | |
7753dea8 MD |
169 | { "consumerd-cmd-sock", 1, 0, 'c' }, |
170 | { "consumerd-err-sock", 1, 0, 'e' }, | |
d4a1283e JD |
171 | { "daemonize", 0, 0, 'd' }, |
172 | { "help", 0, 0, 'h' }, | |
173 | { "quiet", 0, 0, 'q' }, | |
174 | { "verbose", 0, 0, 'v' }, | |
175 | { "version", 0, 0, 'V' }, | |
3bd1e081 | 176 | { "kernel", 0, 0, 'k' }, |
74d0b642 | 177 | #ifdef HAVE_LIBLTTNG_UST_CTL |
3bd1e081 MD |
178 | { "ust", 0, 0, 'u' }, |
179 | #endif | |
d4a1283e JD |
180 | { NULL, 0, 0, 0 } |
181 | }; | |
182 | ||
183 | while (1) { | |
184 | int option_index = 0; | |
3bd1e081 | 185 | c = getopt_long(argc, argv, "dhqvVku" "c:e:", long_options, &option_index); |
d4a1283e JD |
186 | if (c == -1) { |
187 | break; | |
188 | } | |
189 | ||
190 | switch (c) { | |
914a571b JD |
191 | case 0: |
192 | fprintf(stderr, "option %s", long_options[option_index].name); | |
193 | if (optarg) { | |
194 | fprintf(stderr, " with arg %s\n", optarg); | |
195 | } | |
196 | break; | |
197 | case 'c': | |
198 | snprintf(command_sock_path, PATH_MAX, "%s", optarg); | |
199 | break; | |
200 | case 'e': | |
201 | snprintf(error_sock_path, PATH_MAX, "%s", optarg); | |
202 | break; | |
203 | case 'd': | |
204 | opt_daemon = 1; | |
205 | break; | |
206 | case 'h': | |
3183dbb0 DG |
207 | usage(stdout); |
208 | exit(EXIT_SUCCESS); | |
914a571b | 209 | case 'q': |
97e19046 | 210 | lttng_opt_quiet = 1; |
914a571b JD |
211 | break; |
212 | case 'v': | |
97e19046 | 213 | lttng_opt_verbose = 1; |
914a571b JD |
214 | break; |
215 | case 'V': | |
216 | fprintf(stdout, "%s\n", VERSION); | |
217 | exit(EXIT_SUCCESS); | |
3bd1e081 MD |
218 | case 'k': |
219 | opt_type = LTTNG_CONSUMER_KERNEL; | |
220 | break; | |
74d0b642 | 221 | #ifdef HAVE_LIBLTTNG_UST_CTL |
3bd1e081 | 222 | case 'u': |
7753dea8 MD |
223 | # if (CAA_BITS_PER_LONG == 64) |
224 | opt_type = LTTNG_CONSUMER64_UST; | |
225 | # elif (CAA_BITS_PER_LONG == 32) | |
226 | opt_type = LTTNG_CONSUMER32_UST; | |
227 | # else | |
228 | # error "Unknown bitness" | |
229 | # endif | |
3bd1e081 MD |
230 | break; |
231 | #endif | |
914a571b | 232 | default: |
3183dbb0 | 233 | usage(stderr); |
914a571b | 234 | exit(EXIT_FAILURE); |
d4a1283e JD |
235 | } |
236 | } | |
237 | } | |
238 | ||
1ccfc0e3 DG |
239 | /* |
240 | * Set open files limit to unlimited. This daemon can open a large number of | |
241 | * file descriptors in order to consumer multiple kernel traces. | |
242 | */ | |
243 | static void set_ulimit(void) | |
244 | { | |
245 | int ret; | |
246 | struct rlimit lim; | |
247 | ||
248 | /* The kernel does not allowed an infinite limit for open files */ | |
249 | lim.rlim_cur = 65535; | |
250 | lim.rlim_max = 65535; | |
251 | ||
252 | ret = setrlimit(RLIMIT_NOFILE, &lim); | |
253 | if (ret < 0) { | |
254 | PERROR("failed to set open files limit"); | |
255 | } | |
256 | } | |
257 | ||
d4a1283e JD |
258 | /* |
259 | * main | |
260 | */ | |
261 | int main(int argc, char **argv) | |
262 | { | |
d4a1283e JD |
263 | int ret = 0; |
264 | void *status; | |
265 | ||
266 | /* Parse arguments */ | |
267 | progname = argv[0]; | |
268 | parse_args(argc, argv); | |
269 | ||
270 | /* Daemonize */ | |
271 | if (opt_daemon) { | |
ceed52b5 MD |
272 | int i; |
273 | ||
274 | /* | |
275 | * fork | |
276 | * child: setsid, close FD 0, 1, 2, chdir / | |
277 | * parent: exit (if fork is successful) | |
278 | */ | |
d4a1283e JD |
279 | ret = daemon(0, 0); |
280 | if (ret < 0) { | |
ceed52b5 | 281 | PERROR("daemon"); |
d4a1283e JD |
282 | goto error; |
283 | } | |
ceed52b5 MD |
284 | /* |
285 | * We are in the child. Make sure all other file | |
286 | * descriptors are closed, in case we are called with | |
287 | * more opened file descriptors than the standard ones. | |
288 | */ | |
289 | for (i = 3; i < sysconf(_SC_OPEN_MAX); i++) { | |
290 | (void) close(i); | |
291 | } | |
d4a1283e JD |
292 | } |
293 | ||
fb3a43a9 DG |
294 | /* Set up max poll set size */ |
295 | lttng_poll_set_max_size(); | |
296 | ||
d4a1283e | 297 | if (strlen(command_sock_path) == 0) { |
7753dea8 MD |
298 | switch (opt_type) { |
299 | case LTTNG_CONSUMER_KERNEL: | |
60922cb0 | 300 | snprintf(command_sock_path, PATH_MAX, DEFAULT_KCONSUMERD_CMD_SOCK_PATH, |
990570ed | 301 | DEFAULT_LTTNG_RUNDIR); |
7753dea8 MD |
302 | break; |
303 | case LTTNG_CONSUMER64_UST: | |
67e40797 | 304 | snprintf(command_sock_path, PATH_MAX, |
60922cb0 | 305 | DEFAULT_USTCONSUMERD64_CMD_SOCK_PATH, DEFAULT_LTTNG_RUNDIR); |
7753dea8 MD |
306 | break; |
307 | case LTTNG_CONSUMER32_UST: | |
67e40797 | 308 | snprintf(command_sock_path, PATH_MAX, |
60922cb0 | 309 | DEFAULT_USTCONSUMERD32_CMD_SOCK_PATH, DEFAULT_LTTNG_RUNDIR); |
7753dea8 MD |
310 | break; |
311 | default: | |
312 | WARN("Unknown consumerd type"); | |
313 | goto error; | |
314 | } | |
d4a1283e | 315 | } |
e4421fec DG |
316 | |
317 | /* Init */ | |
318 | lttng_consumer_init(); | |
319 | ||
1ccfc0e3 DG |
320 | if (!getuid()) { |
321 | /* Set limit for open files */ | |
322 | set_ulimit(); | |
323 | } | |
324 | ||
5348b470 | 325 | /* create the consumer instance with and assign the callbacks */ |
d41f73b7 MD |
326 | ctx = lttng_consumer_create(opt_type, lttng_consumer_read_subbuffer, |
327 | NULL, lttng_consumer_on_recv_stream, NULL); | |
cb040cc1 JD |
328 | if (ctx == NULL) { |
329 | goto error; | |
330 | } | |
331 | ||
3bd1e081 | 332 | lttng_consumer_set_command_sock_path(ctx, command_sock_path); |
d4a1283e | 333 | if (strlen(error_sock_path) == 0) { |
7753dea8 MD |
334 | switch (opt_type) { |
335 | case LTTNG_CONSUMER_KERNEL: | |
60922cb0 | 336 | snprintf(error_sock_path, PATH_MAX, DEFAULT_KCONSUMERD_ERR_SOCK_PATH, |
990570ed | 337 | DEFAULT_LTTNG_RUNDIR); |
7753dea8 MD |
338 | break; |
339 | case LTTNG_CONSUMER64_UST: | |
67e40797 | 340 | snprintf(error_sock_path, PATH_MAX, |
60922cb0 | 341 | DEFAULT_USTCONSUMERD64_ERR_SOCK_PATH, DEFAULT_LTTNG_RUNDIR); |
7753dea8 MD |
342 | break; |
343 | case LTTNG_CONSUMER32_UST: | |
67e40797 | 344 | snprintf(error_sock_path, PATH_MAX, |
60922cb0 | 345 | DEFAULT_USTCONSUMERD32_ERR_SOCK_PATH, DEFAULT_LTTNG_RUNDIR); |
7753dea8 MD |
346 | break; |
347 | default: | |
348 | WARN("Unknown consumerd type"); | |
349 | goto error; | |
350 | } | |
d4a1283e JD |
351 | } |
352 | ||
353 | if (set_signal_handler() < 0) { | |
354 | goto error; | |
355 | } | |
356 | ||
32258573 | 357 | /* Connect to the socket created by lttng-sessiond to report errors */ |
d4a1283e | 358 | DBG("Connecting to error socket %s", error_sock_path); |
1ce86c9a | 359 | ret = lttcomm_connect_unix_sock(error_sock_path); |
32258573 | 360 | /* not a fatal error, but all communication with lttng-sessiond will fail */ |
1ce86c9a | 361 | if (ret < 0) { |
99bab54f | 362 | WARN("Cannot connect to error socket (is lttng-sessiond started?)"); |
d4a1283e | 363 | } |
3bd1e081 | 364 | lttng_consumer_set_error_sock(ctx, ret); |
d4a1283e | 365 | |
7d980def | 366 | /* Create thread to manage the polling/writing of trace metadata */ |
df27ef7b | 367 | ret = pthread_create(&metadata_thread, NULL, consumer_thread_metadata_poll, |
7d980def DG |
368 | (void *) ctx); |
369 | if (ret != 0) { | |
370 | perror("pthread_create"); | |
371 | goto error; | |
372 | } | |
373 | ||
374 | /* Create thread to manage the polling/writing of trace data */ | |
df27ef7b | 375 | ret = pthread_create(&data_thread, NULL, consumer_thread_data_poll, |
cb040cc1 | 376 | (void *) ctx); |
d4a1283e JD |
377 | if (ret != 0) { |
378 | perror("pthread_create"); | |
df27ef7b | 379 | goto data_error; |
d4a1283e JD |
380 | } |
381 | ||
7d980def | 382 | /* Create the thread to manage the receive of fd */ |
df27ef7b | 383 | ret = pthread_create(&sessiond_thread, NULL, consumer_thread_sessiond_poll, |
cb040cc1 | 384 | (void *) ctx); |
d4a1283e JD |
385 | if (ret != 0) { |
386 | perror("pthread_create"); | |
df27ef7b DG |
387 | goto sessiond_error; |
388 | } | |
389 | ||
390 | ret = pthread_join(sessiond_thread, &status); | |
391 | if (ret != 0) { | |
392 | perror("pthread_join"); | |
d4a1283e JD |
393 | goto error; |
394 | } | |
395 | ||
df27ef7b DG |
396 | sessiond_error: |
397 | ret = pthread_join(data_thread, &status); | |
398 | if (ret != 0) { | |
399 | perror("pthread_join"); | |
400 | goto error; | |
401 | } | |
402 | ||
403 | data_error: | |
404 | ret = pthread_join(metadata_thread, &status); | |
405 | if (ret != 0) { | |
406 | perror("pthread_join"); | |
407 | goto error; | |
408 | } | |
409 | ||
410 | if (!ret) { | |
411 | ret = EXIT_SUCCESS; | |
412 | lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_EXIT_SUCCESS); | |
413 | goto end; | |
d4a1283e | 414 | } |
d4a1283e JD |
415 | |
416 | error: | |
417 | ret = EXIT_FAILURE; | |
f73fabfd | 418 | lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_EXIT_FAILURE); |
d4a1283e JD |
419 | |
420 | end: | |
3bd1e081 MD |
421 | lttng_consumer_destroy(ctx); |
422 | lttng_consumer_cleanup(); | |
d4a1283e JD |
423 | |
424 | return ret; | |
425 | } |