Add lttng-error.h containing every API err. code
[lttng-tools.git] / src / bin / lttng-consumerd / lttng-consumerd.c
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 modify
6 * it under the terms of the GNU General Public License, version 2 only,
7 * as published by the Free Software Foundation.
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 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.
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>
30 #include <sys/resource.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>
38 #include <sys/mman.h>
39 #include <assert.h>
40 #include <config.h>
41 #include <urcu/compiler.h>
42 #include <ulimit.h>
43
44 #include <common/defaults.h>
45 #include <common/common.h>
46 #include <common/consumer.h>
47 #include <common/sessiond-comm/sessiond-comm.h>
48
49 #include "lttng-consumerd.h"
50
51 /* TODO : support UST (all direct kernel-ctl accesses). */
52
53 /* the two threads (receive fd and poll) */
54 static pthread_t threads[2];
55
56 /* to count the number of times the user pressed ctrl+c */
57 static int sigintcount = 0;
58
59 /* Argument variables */
60 int lttng_opt_quiet; /* not static in error.h */
61 int lttng_opt_verbose; /* not static in error.h */
62 static int opt_daemon;
63 static const char *progname;
64 static char command_sock_path[PATH_MAX]; /* Global command socket path */
65 static char error_sock_path[PATH_MAX]; /* Global error path */
66 static enum lttng_consumer_type opt_type = LTTNG_CONSUMER_KERNEL;
67
68 /* the liblttngconsumerd context */
69 static struct lttng_consumer_local_data *ctx;
70
71 /*
72 * Signal handler for the daemon
73 */
74 static void sighandler(int sig)
75 {
76 if (sig == SIGINT && sigintcount++ == 0) {
77 DBG("ignoring first SIGINT");
78 return;
79 }
80
81 lttng_consumer_should_exit(ctx);
82 }
83
84 /*
85 * Setup signal handler for :
86 * SIGINT, SIGTERM, SIGPIPE
87 */
88 static int set_signal_handler(void)
89 {
90 int ret = 0;
91 struct sigaction sa;
92 sigset_t sigset;
93
94 if ((ret = sigemptyset(&sigset)) < 0) {
95 perror("sigemptyset");
96 return ret;
97 }
98
99 sa.sa_handler = sighandler;
100 sa.sa_mask = sigset;
101 sa.sa_flags = 0;
102 if ((ret = sigaction(SIGTERM, &sa, NULL)) < 0) {
103 perror("sigaction");
104 return ret;
105 }
106
107 if ((ret = sigaction(SIGINT, &sa, NULL)) < 0) {
108 perror("sigaction");
109 return ret;
110 }
111
112 if ((ret = sigaction(SIGPIPE, &sa, NULL)) < 0) {
113 perror("sigaction");
114 return ret;
115 }
116
117 return ret;
118 }
119
120 /*
121 * Usage function on stream file.
122 */
123 static void usage(FILE *fp)
124 {
125 fprintf(fp, "Usage: %s OPTIONS\n\nOptions:\n", progname);
126 fprintf(fp, " -h, --help "
127 "Display this usage.\n");
128 fprintf(fp, " -c, --consumerd-cmd-sock PATH "
129 "Specify path for the command socket\n");
130 fprintf(fp, " -e, --consumerd-err-sock PATH "
131 "Specify path for the error socket\n");
132 fprintf(fp, " -d, --daemonize "
133 "Start as a daemon.\n");
134 fprintf(fp, " -q, --quiet "
135 "No output at all.\n");
136 fprintf(fp, " -v, --verbose "
137 "Verbose mode. Activate DBG() macro.\n");
138 fprintf(fp, " -V, --version "
139 "Show version number.\n");
140 fprintf(fp, " -k, --kernel "
141 "Consumer kernel buffers (default).\n");
142 fprintf(fp, " -u, --ust "
143 "Consumer UST buffers.%s\n",
144 #ifdef HAVE_LIBLTTNG_UST_CTL
145 ""
146 #else
147 " (support not compiled in)"
148 #endif
149 );
150 }
151
152 /*
153 * daemon argument parsing
154 */
155 static void parse_args(int argc, char **argv)
156 {
157 int c;
158
159 static struct option long_options[] = {
160 { "consumerd-cmd-sock", 1, 0, 'c' },
161 { "consumerd-err-sock", 1, 0, 'e' },
162 { "daemonize", 0, 0, 'd' },
163 { "help", 0, 0, 'h' },
164 { "quiet", 0, 0, 'q' },
165 { "verbose", 0, 0, 'v' },
166 { "version", 0, 0, 'V' },
167 { "kernel", 0, 0, 'k' },
168 #ifdef HAVE_LIBLTTNG_UST_CTL
169 { "ust", 0, 0, 'u' },
170 #endif
171 { NULL, 0, 0, 0 }
172 };
173
174 while (1) {
175 int option_index = 0;
176 c = getopt_long(argc, argv, "dhqvVku" "c:e:", long_options, &option_index);
177 if (c == -1) {
178 break;
179 }
180
181 switch (c) {
182 case 0:
183 fprintf(stderr, "option %s", long_options[option_index].name);
184 if (optarg) {
185 fprintf(stderr, " with arg %s\n", optarg);
186 }
187 break;
188 case 'c':
189 snprintf(command_sock_path, PATH_MAX, "%s", optarg);
190 break;
191 case 'e':
192 snprintf(error_sock_path, PATH_MAX, "%s", optarg);
193 break;
194 case 'd':
195 opt_daemon = 1;
196 break;
197 case 'h':
198 usage(stdout);
199 exit(EXIT_SUCCESS);
200 case 'q':
201 lttng_opt_quiet = 1;
202 break;
203 case 'v':
204 lttng_opt_verbose = 1;
205 break;
206 case 'V':
207 fprintf(stdout, "%s\n", VERSION);
208 exit(EXIT_SUCCESS);
209 case 'k':
210 opt_type = LTTNG_CONSUMER_KERNEL;
211 break;
212 #ifdef HAVE_LIBLTTNG_UST_CTL
213 case 'u':
214 # if (CAA_BITS_PER_LONG == 64)
215 opt_type = LTTNG_CONSUMER64_UST;
216 # elif (CAA_BITS_PER_LONG == 32)
217 opt_type = LTTNG_CONSUMER32_UST;
218 # else
219 # error "Unknown bitness"
220 # endif
221 break;
222 #endif
223 default:
224 usage(stderr);
225 exit(EXIT_FAILURE);
226 }
227 }
228 }
229
230 /*
231 * Set open files limit to unlimited. This daemon can open a large number of
232 * file descriptors in order to consumer multiple kernel traces.
233 */
234 static void set_ulimit(void)
235 {
236 int ret;
237 struct rlimit lim;
238
239 /* The kernel does not allowed an infinite limit for open files */
240 lim.rlim_cur = 65535;
241 lim.rlim_max = 65535;
242
243 ret = setrlimit(RLIMIT_NOFILE, &lim);
244 if (ret < 0) {
245 PERROR("failed to set open files limit");
246 }
247 }
248
249 /*
250 * main
251 */
252 int main(int argc, char **argv)
253 {
254 int i;
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) {
264 int i;
265
266 /*
267 * fork
268 * child: setsid, close FD 0, 1, 2, chdir /
269 * parent: exit (if fork is successful)
270 */
271 ret = daemon(0, 0);
272 if (ret < 0) {
273 PERROR("daemon");
274 goto error;
275 }
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 }
284 }
285
286 if (strlen(command_sock_path) == 0) {
287 switch (opt_type) {
288 case LTTNG_CONSUMER_KERNEL:
289 snprintf(command_sock_path, PATH_MAX, DEFAULT_KCONSUMERD_CMD_SOCK_PATH,
290 DEFAULT_LTTNG_RUNDIR);
291 break;
292 case LTTNG_CONSUMER64_UST:
293 snprintf(command_sock_path, PATH_MAX,
294 DEFAULT_USTCONSUMERD64_CMD_SOCK_PATH, DEFAULT_LTTNG_RUNDIR);
295 break;
296 case LTTNG_CONSUMER32_UST:
297 snprintf(command_sock_path, PATH_MAX,
298 DEFAULT_USTCONSUMERD32_CMD_SOCK_PATH, DEFAULT_LTTNG_RUNDIR);
299 break;
300 default:
301 WARN("Unknown consumerd type");
302 goto error;
303 }
304 }
305
306 /* Init */
307 lttng_consumer_init();
308
309 if (!getuid()) {
310 /* Set limit for open files */
311 set_ulimit();
312 }
313
314 /* create the consumer instance with and assign the callbacks */
315 ctx = lttng_consumer_create(opt_type, lttng_consumer_read_subbuffer,
316 NULL, lttng_consumer_on_recv_stream, NULL);
317 if (ctx == NULL) {
318 goto error;
319 }
320
321 lttng_consumer_set_command_sock_path(ctx, command_sock_path);
322 if (strlen(error_sock_path) == 0) {
323 switch (opt_type) {
324 case LTTNG_CONSUMER_KERNEL:
325 snprintf(error_sock_path, PATH_MAX, DEFAULT_KCONSUMERD_ERR_SOCK_PATH,
326 DEFAULT_LTTNG_RUNDIR);
327 break;
328 case LTTNG_CONSUMER64_UST:
329 snprintf(error_sock_path, PATH_MAX,
330 DEFAULT_USTCONSUMERD64_ERR_SOCK_PATH, DEFAULT_LTTNG_RUNDIR);
331 break;
332 case LTTNG_CONSUMER32_UST:
333 snprintf(error_sock_path, PATH_MAX,
334 DEFAULT_USTCONSUMERD32_ERR_SOCK_PATH, DEFAULT_LTTNG_RUNDIR);
335 break;
336 default:
337 WARN("Unknown consumerd type");
338 goto error;
339 }
340 }
341
342 if (set_signal_handler() < 0) {
343 goto error;
344 }
345
346 /* Connect to the socket created by lttng-sessiond to report errors */
347 DBG("Connecting to error socket %s", error_sock_path);
348 ret = lttcomm_connect_unix_sock(error_sock_path);
349 /* not a fatal error, but all communication with lttng-sessiond will fail */
350 if (ret < 0) {
351 WARN("Cannot connect to error socket (is lttng-sessiond started?)");
352 }
353 lttng_consumer_set_error_sock(ctx, ret);
354
355 /* Create the thread to manage the receive of fd */
356 ret = pthread_create(&threads[0], NULL, lttng_consumer_thread_receive_fds,
357 (void *) ctx);
358 if (ret != 0) {
359 perror("pthread_create");
360 goto error;
361 }
362
363 /* Create thread to manage the polling/writing of traces */
364 ret = pthread_create(&threads[1], NULL, lttng_consumer_thread_poll_fds,
365 (void *) ctx);
366 if (ret != 0) {
367 perror("pthread_create");
368 goto error;
369 }
370
371 for (i = 0; i < 2; i++) {
372 ret = pthread_join(threads[i], &status);
373 if (ret != 0) {
374 perror("pthread_join");
375 goto error;
376 }
377 }
378 ret = EXIT_SUCCESS;
379 lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_EXIT_SUCCESS);
380 goto end;
381
382 error:
383 ret = EXIT_FAILURE;
384 lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_EXIT_FAILURE);
385
386 end:
387 lttng_consumer_destroy(ctx);
388 lttng_consumer_cleanup();
389
390 return ret;
391 }
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