dce188aced643c282f71f4f7d114ad92f05374e8
[lttng-tools.git] / 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 <lttng-consumerd.h>
44 #include <lttng-kernel-ctl.h>
45 #include <lttng-sessiond-comm.h>
46 #include <lttng/lttng-kconsumer.h>
47 #include <lttng/lttng-ustconsumer.h>
48 #include <lttngerr.h>
49
50 /* TODO : support UST (all direct kernctl accesses). */
51
52 /* the two threads (receive fd and poll) */
53 static pthread_t threads[2];
54
55 /* to count the number of time the user pressed ctrl+c */
56 static int sigintcount = 0;
57
58 /* Argument variables */
59 int opt_quiet;
60 int opt_verbose;
61 static int opt_daemon;
62 static const char *progname;
63 static char command_sock_path[PATH_MAX]; /* Global command socket path */
64 static char error_sock_path[PATH_MAX]; /* Global error path */
65 static enum lttng_consumer_type opt_type = LTTNG_CONSUMER_KERNEL;
66
67 /* the liblttngconsumerd context */
68 static struct lttng_consumer_local_data *ctx;
69
70 /*
71 * Signal handler for the daemon
72 */
73 static void sighandler(int sig)
74 {
75 if (sig == SIGINT && sigintcount++ == 0) {
76 DBG("ignoring first SIGINT");
77 return;
78 }
79
80 lttng_consumer_should_exit(ctx);
81 }
82
83 /*
84 * Setup signal handler for :
85 * SIGINT, SIGTERM, SIGPIPE
86 */
87 static int set_signal_handler(void)
88 {
89 int ret = 0;
90 struct sigaction sa;
91 sigset_t sigset;
92
93 if ((ret = sigemptyset(&sigset)) < 0) {
94 perror("sigemptyset");
95 return ret;
96 }
97
98 sa.sa_handler = sighandler;
99 sa.sa_mask = sigset;
100 sa.sa_flags = 0;
101 if ((ret = sigaction(SIGTERM, &sa, NULL)) < 0) {
102 perror("sigaction");
103 return ret;
104 }
105
106 if ((ret = sigaction(SIGINT, &sa, NULL)) < 0) {
107 perror("sigaction");
108 return ret;
109 }
110
111 if ((ret = sigaction(SIGPIPE, &sa, NULL)) < 0) {
112 perror("sigaction");
113 return ret;
114 }
115
116 return ret;
117 }
118
119 /*
120 * usage function on stderr
121 */
122 static void usage(void)
123 {
124 fprintf(stderr, "Usage: %s OPTIONS\n\nOptions:\n", progname);
125 fprintf(stderr, " -h, --help "
126 "Display this usage.\n");
127 fprintf(stderr, " -c, --consumerd-cmd-sock PATH "
128 "Specify path for the command socket\n");
129 fprintf(stderr, " -e, --consumerd-err-sock PATH "
130 "Specify path for the error socket\n");
131 fprintf(stderr, " -d, --daemonize "
132 "Start as a daemon.\n");
133 fprintf(stderr, " -q, --quiet "
134 "No output at all.\n");
135 fprintf(stderr, " -v, --verbose "
136 "Verbose mode. Activate DBG() macro.\n");
137 fprintf(stderr, " -V, --version "
138 "Show version number.\n");
139 fprintf(stderr, " -k, --kernel "
140 "Consumer kernel buffers (default).\n");
141 fprintf(stderr, " -u, --ust "
142 "Consumer UST buffers.%s\n",
143 #ifdef HAVE_LIBLTTNG_UST_CTL
144 ""
145 #else
146 " (support not compiled in)"
147 #endif
148 );
149 }
150
151 /*
152 * daemon argument parsing
153 */
154 static void parse_args(int argc, char **argv)
155 {
156 int c;
157
158 static struct option long_options[] = {
159 { "consumerd-cmd-sock", 1, 0, 'c' },
160 { "consumerd-err-sock", 1, 0, 'e' },
161 { "daemonize", 0, 0, 'd' },
162 { "help", 0, 0, 'h' },
163 { "quiet", 0, 0, 'q' },
164 { "verbose", 0, 0, 'v' },
165 { "version", 0, 0, 'V' },
166 { "kernel", 0, 0, 'k' },
167 #ifdef HAVE_LIBLTTNG_UST_CTL
168 { "ust", 0, 0, 'u' },
169 #endif
170 { NULL, 0, 0, 0 }
171 };
172
173 while (1) {
174 int option_index = 0;
175 c = getopt_long(argc, argv, "dhqvVku" "c:e:", long_options, &option_index);
176 if (c == -1) {
177 break;
178 }
179
180 switch (c) {
181 case 0:
182 fprintf(stderr, "option %s", long_options[option_index].name);
183 if (optarg) {
184 fprintf(stderr, " with arg %s\n", optarg);
185 }
186 break;
187 case 'c':
188 snprintf(command_sock_path, PATH_MAX, "%s", optarg);
189 break;
190 case 'e':
191 snprintf(error_sock_path, PATH_MAX, "%s", optarg);
192 break;
193 case 'd':
194 opt_daemon = 1;
195 break;
196 case 'h':
197 usage();
198 exit(EXIT_FAILURE);
199 case 'q':
200 opt_quiet = 1;
201 break;
202 case 'v':
203 opt_verbose = 1;
204 break;
205 case 'V':
206 fprintf(stdout, "%s\n", VERSION);
207 exit(EXIT_SUCCESS);
208 case 'k':
209 opt_type = LTTNG_CONSUMER_KERNEL;
210 break;
211 #ifdef HAVE_LIBLTTNG_UST_CTL
212 case 'u':
213 # if (CAA_BITS_PER_LONG == 64)
214 opt_type = LTTNG_CONSUMER64_UST;
215 # elif (CAA_BITS_PER_LONG == 32)
216 opt_type = LTTNG_CONSUMER32_UST;
217 # else
218 # error "Unknown bitness"
219 # endif
220 break;
221 #endif
222 default:
223 usage();
224 exit(EXIT_FAILURE);
225 }
226 }
227 }
228
229 /*
230 * main
231 */
232 int main(int argc, char **argv)
233 {
234 int i;
235 int ret = 0;
236 void *status;
237
238 /* Parse arguments */
239 progname = argv[0];
240 parse_args(argc, argv);
241
242 /* Daemonize */
243 if (opt_daemon) {
244 ret = daemon(0, 0);
245 if (ret < 0) {
246 perror("daemon");
247 goto error;
248 }
249 }
250
251 if (strlen(command_sock_path) == 0) {
252 switch (opt_type) {
253 case LTTNG_CONSUMER_KERNEL:
254 strcpy(command_sock_path, KCONSUMERD_CMD_SOCK_PATH);
255 break;
256 case LTTNG_CONSUMER64_UST:
257 strcpy(command_sock_path, USTCONSUMERD64_CMD_SOCK_PATH);
258 break;
259 case LTTNG_CONSUMER32_UST:
260 strcpy(command_sock_path, USTCONSUMERD32_CMD_SOCK_PATH);
261 break;
262 default:
263 WARN("Unknown consumerd type");
264 goto error;
265 }
266 }
267 /* create the consumer instance with and assign the callbacks */
268 ctx = lttng_consumer_create(opt_type, lttng_consumer_read_subbuffer,
269 NULL, lttng_consumer_on_recv_stream, NULL);
270 if (ctx == NULL) {
271 goto error;
272 }
273
274 lttng_consumer_set_command_sock_path(ctx, command_sock_path);
275 if (strlen(error_sock_path) == 0) {
276 switch (opt_type) {
277 case LTTNG_CONSUMER_KERNEL:
278 strcpy(error_sock_path, KCONSUMERD_ERR_SOCK_PATH);
279 break;
280 case LTTNG_CONSUMER64_UST:
281 strcpy(error_sock_path, USTCONSUMERD64_ERR_SOCK_PATH);
282 break;
283 case LTTNG_CONSUMER32_UST:
284 strcpy(error_sock_path, USTCONSUMERD32_ERR_SOCK_PATH);
285 break;
286 default:
287 WARN("Unknown consumerd type");
288 goto error;
289 }
290 }
291
292 if (set_signal_handler() < 0) {
293 goto error;
294 }
295
296 /* Connect to the socket created by lttng-sessiond to report errors */
297 DBG("Connecting to error socket %s", error_sock_path);
298 ret = lttcomm_connect_unix_sock(error_sock_path);
299 /* not a fatal error, but all communication with lttng-sessiond will fail */
300 if (ret < 0) {
301 WARN("Cannot connect to error socket, is lttng-sessiond started ?");
302 }
303 lttng_consumer_set_error_sock(ctx, ret);
304
305 /* Create the thread to manage the receive of fd */
306 ret = pthread_create(&threads[0], NULL, lttng_consumer_thread_receive_fds,
307 (void *) ctx);
308 if (ret != 0) {
309 perror("pthread_create");
310 goto error;
311 }
312
313 /* Create thread to manage the polling/writing of traces */
314 ret = pthread_create(&threads[1], NULL, lttng_consumer_thread_poll_fds,
315 (void *) ctx);
316 if (ret != 0) {
317 perror("pthread_create");
318 goto error;
319 }
320
321 for (i = 0; i < 2; i++) {
322 ret = pthread_join(threads[i], &status);
323 if (ret != 0) {
324 perror("pthread_join");
325 goto error;
326 }
327 }
328 ret = EXIT_SUCCESS;
329 lttng_consumer_send_error(ctx, CONSUMERD_EXIT_SUCCESS);
330 goto end;
331
332 error:
333 ret = EXIT_FAILURE;
334 lttng_consumer_send_error(ctx, CONSUMERD_EXIT_FAILURE);
335
336 end:
337 lttng_consumer_destroy(ctx);
338 lttng_consumer_cleanup();
339
340 return ret;
341 }
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