8cb264ab1bd74b413a4b0a32b50cf80bfdbb5343
[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
6 * modify it under the terms of the GNU General Public License
7 * as published by the Free Software Foundation; only version 2
8 * of the License.
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>
38 #include <sys/mman.h>
39 #include <assert.h>
40 #include <config.h>
41 #include <urcu/compiler.h>
42
43 #include <common/lttngerr.h>
44 #include <common/kernel-ctl/kernel-ctl.h>
45 #include <common/sessiond-comm/sessiond-comm.h>
46 #include <common/kernel-consumer/kernel-consumer.h>
47 #include <common/ust-consumer/ust-consumer.h>
48
49 #include "lttng-consumerd.h"
50
51 /* TODO : support UST (all direct kernctl accesses). */
52
53 /* the two threads (receive fd and poll) */
54 static pthread_t threads[2];
55
56 /* to count the number of time the user pressed ctrl+c */
57 static int sigintcount = 0;
58
59 /* Argument variables */
60 int opt_quiet;
61 int opt_verbose;
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 stderr
122 */
123 static void usage(void)
124 {
125 fprintf(stderr, "Usage: %s OPTIONS\n\nOptions:\n", progname);
126 fprintf(stderr, " -h, --help "
127 "Display this usage.\n");
128 fprintf(stderr, " -c, --consumerd-cmd-sock PATH "
129 "Specify path for the command socket\n");
130 fprintf(stderr, " -e, --consumerd-err-sock PATH "
131 "Specify path for the error socket\n");
132 fprintf(stderr, " -d, --daemonize "
133 "Start as a daemon.\n");
134 fprintf(stderr, " -q, --quiet "
135 "No output at all.\n");
136 fprintf(stderr, " -v, --verbose "
137 "Verbose mode. Activate DBG() macro.\n");
138 fprintf(stderr, " -V, --version "
139 "Show version number.\n");
140 fprintf(stderr, " -k, --kernel "
141 "Consumer kernel buffers (default).\n");
142 fprintf(stderr, " -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();
199 exit(EXIT_FAILURE);
200 case 'q':
201 opt_quiet = 1;
202 break;
203 case 'v':
204 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();
225 exit(EXIT_FAILURE);
226 }
227 }
228 }
229
230 /*
231 * main
232 */
233 int main(int argc, char **argv)
234 {
235 int i;
236 int ret = 0;
237 void *status;
238
239 /* Parse arguments */
240 progname = argv[0];
241 parse_args(argc, argv);
242
243 /* Daemonize */
244 if (opt_daemon) {
245 ret = daemon(0, 0);
246 if (ret < 0) {
247 perror("daemon");
248 goto error;
249 }
250 }
251
252 if (strlen(command_sock_path) == 0) {
253 switch (opt_type) {
254 case LTTNG_CONSUMER_KERNEL:
255 snprintf(command_sock_path, PATH_MAX, KCONSUMERD_CMD_SOCK_PATH,
256 LTTNG_RUNDIR);
257 break;
258 case LTTNG_CONSUMER64_UST:
259 snprintf(command_sock_path, PATH_MAX,
260 USTCONSUMERD64_CMD_SOCK_PATH, LTTNG_RUNDIR);
261 break;
262 case LTTNG_CONSUMER32_UST:
263 snprintf(command_sock_path, PATH_MAX,
264 USTCONSUMERD32_CMD_SOCK_PATH, LTTNG_RUNDIR);
265 break;
266 default:
267 WARN("Unknown consumerd type");
268 goto error;
269 }
270 }
271
272 /* Init */
273 lttng_consumer_init();
274
275 /* create the consumer instance with and assign the callbacks */
276 ctx = lttng_consumer_create(opt_type, lttng_consumer_read_subbuffer,
277 NULL, lttng_consumer_on_recv_stream, NULL);
278 if (ctx == NULL) {
279 goto error;
280 }
281
282 lttng_consumer_set_command_sock_path(ctx, command_sock_path);
283 if (strlen(error_sock_path) == 0) {
284 switch (opt_type) {
285 case LTTNG_CONSUMER_KERNEL:
286 snprintf(error_sock_path, PATH_MAX, KCONSUMERD_ERR_SOCK_PATH,
287 LTTNG_RUNDIR);
288 break;
289 case LTTNG_CONSUMER64_UST:
290 snprintf(error_sock_path, PATH_MAX,
291 USTCONSUMERD64_ERR_SOCK_PATH, LTTNG_RUNDIR);
292 break;
293 case LTTNG_CONSUMER32_UST:
294 snprintf(error_sock_path, PATH_MAX,
295 USTCONSUMERD32_ERR_SOCK_PATH, LTTNG_RUNDIR);
296 break;
297 default:
298 WARN("Unknown consumerd type");
299 goto error;
300 }
301 }
302
303 if (set_signal_handler() < 0) {
304 goto error;
305 }
306
307 /* Connect to the socket created by lttng-sessiond to report errors */
308 DBG("Connecting to error socket %s", error_sock_path);
309 ret = lttcomm_connect_unix_sock(error_sock_path);
310 /* not a fatal error, but all communication with lttng-sessiond will fail */
311 if (ret < 0) {
312 WARN("Cannot connect to error socket, is lttng-sessiond started ?");
313 }
314 lttng_consumer_set_error_sock(ctx, ret);
315
316 /* Create the thread to manage the receive of fd */
317 ret = pthread_create(&threads[0], NULL, lttng_consumer_thread_receive_fds,
318 (void *) ctx);
319 if (ret != 0) {
320 perror("pthread_create");
321 goto error;
322 }
323
324 /* Create thread to manage the polling/writing of traces */
325 ret = pthread_create(&threads[1], NULL, lttng_consumer_thread_poll_fds,
326 (void *) ctx);
327 if (ret != 0) {
328 perror("pthread_create");
329 goto error;
330 }
331
332 for (i = 0; i < 2; i++) {
333 ret = pthread_join(threads[i], &status);
334 if (ret != 0) {
335 perror("pthread_join");
336 goto error;
337 }
338 }
339 ret = EXIT_SUCCESS;
340 lttng_consumer_send_error(ctx, CONSUMERD_EXIT_SUCCESS);
341 goto end;
342
343 error:
344 ret = EXIT_FAILURE;
345 lttng_consumer_send_error(ctx, CONSUMERD_EXIT_FAILURE);
346
347 end:
348 lttng_consumer_destroy(ctx);
349 lttng_consumer_cleanup();
350
351 return ret;
352 }
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