Fix consumer pid mutex double-unlock
[lttng-tools.git] / lttng-consumerd / lttng-consumerd.c
CommitLineData
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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
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7 * as published by the Free Software Foundation; only version 2
8 * of the License.
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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>
03424a9b 38#include <sys/mman.h>
5348b470 39#include <assert.h>
3bd1e081 40#include <config.h>
d4a1283e 41
3bd1e081 42#include <lttng-consumerd.h>
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43#include <lttng-kernel-ctl.h>
44#include <lttng-sessiond-comm.h>
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45#include <lttng/lttng-kconsumer.h>
46#include <lttng/lttng-ustconsumer.h>
1e307fab 47#include <lttngerr.h>
d4a1283e 48
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49/* TODO : support UST (all direct kernctl accesses). */
50
d4a1283e 51/* the two threads (receive fd and poll) */
6533b585 52static pthread_t threads[2];
d4a1283e 53
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54/* to count the number of time the user pressed ctrl+c */
55static int sigintcount = 0;
56
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57/* Argument variables */
58int opt_quiet;
59int opt_verbose;
60static int opt_daemon;
61static const char *progname;
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62static char command_sock_path[PATH_MAX]; /* Global command socket path */
63static char error_sock_path[PATH_MAX]; /* Global error path */
3bd1e081 64static enum lttng_consumer_type opt_type = LTTNG_CONSUMER_KERNEL;
d4a1283e 65
6533b585 66/* the liblttngkconsumerd context */
3bd1e081 67static struct lttng_consumer_local_data *ctx;
cb040cc1 68
d4a1283e 69/*
6533b585 70 * Signal handler for the daemon
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71 */
72static void sighandler(int sig)
73{
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74 if (sig == SIGINT && sigintcount++ == 0) {
75 DBG("ignoring first SIGINT");
76 return;
77 }
78
3bd1e081 79 lttng_consumer_should_exit(ctx);
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80}
81
82/*
6533b585 83 * Setup signal handler for :
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84 * SIGINT, SIGTERM, SIGPIPE
85 */
86static int set_signal_handler(void)
87{
88 int ret = 0;
89 struct sigaction sa;
90 sigset_t sigset;
91
92 if ((ret = sigemptyset(&sigset)) < 0) {
93 perror("sigemptyset");
94 return ret;
95 }
96
97 sa.sa_handler = sighandler;
98 sa.sa_mask = sigset;
99 sa.sa_flags = 0;
100 if ((ret = sigaction(SIGTERM, &sa, NULL)) < 0) {
101 perror("sigaction");
102 return ret;
103 }
104
105 if ((ret = sigaction(SIGINT, &sa, NULL)) < 0) {
106 perror("sigaction");
107 return ret;
108 }
109
110 if ((ret = sigaction(SIGPIPE, &sa, NULL)) < 0) {
111 perror("sigaction");
112 return ret;
113 }
114
115 return ret;
116}
117
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118/*
119 * usage function on stderr
120 */
121static void usage(void)
122{
123 fprintf(stderr, "Usage: %s OPTIONS\n\nOptions:\n", progname);
124 fprintf(stderr, " -h, --help "
125 "Display this usage.\n");
126 fprintf(stderr, " -c, --kconsumerd-cmd-sock PATH "
127 "Specify path for the command socket\n");
128 fprintf(stderr, " -e, --kconsumerd-err-sock PATH "
129 "Specify path for the error socket\n");
130 fprintf(stderr, " -d, --daemonize "
131 "Start as a daemon.\n");
132 fprintf(stderr, " -q, --quiet "
133 "No output at all.\n");
134 fprintf(stderr, " -v, --verbose "
135 "Verbose mode. Activate DBG() macro.\n");
136 fprintf(stderr, " -V, --version "
137 "Show version number.\n");
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138 fprintf(stderr, " -k, --kernel "
139 "Consumer kernel buffers (default).\n");
140 fprintf(stderr, " -u, --ust "
141 "Consumer UST buffers.%s\n",
74d0b642 142#ifdef HAVE_LIBLTTNG_UST_CTL
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143 ""
144#else
145 " (support not compiled in)"
146#endif
147 );
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148}
149
150/*
151 * daemon argument parsing
152 */
153static void parse_args(int argc, char **argv)
154{
155 int c;
156
157 static struct option long_options[] = {
158 { "kconsumerd-cmd-sock", 1, 0, 'c' },
159 { "kconsumerd-err-sock", 1, 0, 'e' },
160 { "daemonize", 0, 0, 'd' },
161 { "help", 0, 0, 'h' },
162 { "quiet", 0, 0, 'q' },
163 { "verbose", 0, 0, 'v' },
164 { "version", 0, 0, 'V' },
3bd1e081 165 { "kernel", 0, 0, 'k' },
74d0b642 166#ifdef HAVE_LIBLTTNG_UST_CTL
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167 { "ust", 0, 0, 'u' },
168#endif
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169 { NULL, 0, 0, 0 }
170 };
171
172 while (1) {
173 int option_index = 0;
3bd1e081 174 c = getopt_long(argc, argv, "dhqvVku" "c:e:", long_options, &option_index);
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175 if (c == -1) {
176 break;
177 }
178
179 switch (c) {
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180 case 0:
181 fprintf(stderr, "option %s", long_options[option_index].name);
182 if (optarg) {
183 fprintf(stderr, " with arg %s\n", optarg);
184 }
185 break;
186 case 'c':
187 snprintf(command_sock_path, PATH_MAX, "%s", optarg);
188 break;
189 case 'e':
190 snprintf(error_sock_path, PATH_MAX, "%s", optarg);
191 break;
192 case 'd':
193 opt_daemon = 1;
194 break;
195 case 'h':
196 usage();
197 exit(EXIT_FAILURE);
198 case 'q':
199 opt_quiet = 1;
200 break;
201 case 'v':
202 opt_verbose = 1;
203 break;
204 case 'V':
205 fprintf(stdout, "%s\n", VERSION);
206 exit(EXIT_SUCCESS);
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207 case 'k':
208 opt_type = LTTNG_CONSUMER_KERNEL;
209 break;
74d0b642 210#ifdef HAVE_LIBLTTNG_UST_CTL
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211 case 'u':
212 opt_type = LTTNG_CONSUMER_UST;
213 break;
214#endif
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215 default:
216 usage();
217 exit(EXIT_FAILURE);
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218 }
219 }
220}
221
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222/*
223 * main
224 */
225int main(int argc, char **argv)
226{
227 int i;
228 int ret = 0;
229 void *status;
230
231 /* Parse arguments */
232 progname = argv[0];
233 parse_args(argc, argv);
234
235 /* Daemonize */
236 if (opt_daemon) {
237 ret = daemon(0, 0);
238 if (ret < 0) {
239 perror("daemon");
240 goto error;
241 }
242 }
243
244 if (strlen(command_sock_path) == 0) {
245 snprintf(command_sock_path, PATH_MAX,
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246 opt_type == LTTNG_CONSUMER_KERNEL ?
247 KCONSUMERD_CMD_SOCK_PATH :
248 USTCONSUMERD_CMD_SOCK_PATH);
d4a1283e 249 }
5348b470 250 /* create the consumer instance with and assign the callbacks */
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251 ctx = lttng_consumer_create(opt_type, lttng_consumer_read_subbuffer,
252 NULL, lttng_consumer_on_recv_stream, NULL);
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253 if (ctx == NULL) {
254 goto error;
255 }
256
3bd1e081 257 lttng_consumer_set_command_sock_path(ctx, command_sock_path);
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258 if (strlen(error_sock_path) == 0) {
259 snprintf(error_sock_path, PATH_MAX,
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260 opt_type == LTTNG_CONSUMER_KERNEL ?
261 KCONSUMERD_ERR_SOCK_PATH :
262 USTCONSUMERD_ERR_SOCK_PATH);
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263 }
264
265 if (set_signal_handler() < 0) {
266 goto error;
267 }
268
32258573 269 /* Connect to the socket created by lttng-sessiond to report errors */
d4a1283e 270 DBG("Connecting to error socket %s", error_sock_path);
1ce86c9a 271 ret = lttcomm_connect_unix_sock(error_sock_path);
32258573 272 /* not a fatal error, but all communication with lttng-sessiond will fail */
1ce86c9a 273 if (ret < 0) {
32258573 274 WARN("Cannot connect to error socket, is lttng-sessiond started ?");
d4a1283e 275 }
3bd1e081 276 lttng_consumer_set_error_sock(ctx, ret);
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277
278 /* Create the thread to manage the receive of fd */
3bd1e081 279 ret = pthread_create(&threads[0], NULL, lttng_consumer_thread_receive_fds,
cb040cc1 280 (void *) ctx);
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281 if (ret != 0) {
282 perror("pthread_create");
283 goto error;
284 }
285
286 /* Create thread to manage the polling/writing of traces */
3bd1e081 287 ret = pthread_create(&threads[1], NULL, lttng_consumer_thread_poll_fds,
cb040cc1 288 (void *) ctx);
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289 if (ret != 0) {
290 perror("pthread_create");
291 goto error;
292 }
293
294 for (i = 0; i < 2; i++) {
295 ret = pthread_join(threads[i], &status);
296 if (ret != 0) {
297 perror("pthread_join");
298 goto error;
299 }
300 }
301 ret = EXIT_SUCCESS;
3bd1e081 302 lttng_consumer_send_error(ctx, CONSUMERD_EXIT_SUCCESS);
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303 goto end;
304
305error:
306 ret = EXIT_FAILURE;
3bd1e081 307 lttng_consumer_send_error(ctx, CONSUMERD_EXIT_FAILURE);
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308
309end:
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310 lttng_consumer_destroy(ctx);
311 lttng_consumer_cleanup();
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312
313 return ret;
314}
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