Update README: document dep on modprobe for kernel tracing
[lttng-tools.git] / src / bin / lttng-consumerd / lttng-consumerd.c
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1/*
2 * Copyright (C) 2011 - Julien Desfossez <julien.desfossez@polymtl.ca>
3 * Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
4 *
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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.
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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 *
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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.
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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/shm.h>
31#include <sys/socket.h>
32#include <sys/stat.h>
33#include <sys/types.h>
34#include <urcu/list.h>
35#include <poll.h>
36#include <unistd.h>
03424a9b 37#include <sys/mman.h>
5348b470 38#include <assert.h>
3bd1e081 39#include <config.h>
7753dea8 40#include <urcu/compiler.h>
d4a1283e 41
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42#include <common/defaults.h>
43#include <common/common.h>
44#include <common/kernel-consumer/kernel-consumer.h>
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45#include <common/kernel-ctl/kernel-ctl.h>
46#include <common/sessiond-comm/sessiond-comm.h>
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47#include <common/ust-consumer/ust-consumer.h>
48
49#include "lttng-consumerd.h"
d4a1283e 50
99bab54f 51/* TODO : support UST (all direct kernel-ctl accesses). */
3bd1e081 52
d4a1283e 53/* the two threads (receive fd and poll) */
6533b585 54static pthread_t threads[2];
d4a1283e 55
3183dbb0 56/* to count the number of times the user pressed ctrl+c */
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57static int sigintcount = 0;
58
d4a1283e 59/* Argument variables */
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60int lttng_opt_quiet; /* not static in error.h */
61int lttng_opt_verbose; /* not static in error.h */
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62static int opt_daemon;
63static const char *progname;
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64static char command_sock_path[PATH_MAX]; /* Global command socket path */
65static char error_sock_path[PATH_MAX]; /* Global error path */
3bd1e081 66static enum lttng_consumer_type opt_type = LTTNG_CONSUMER_KERNEL;
d4a1283e 67
7753dea8 68/* the liblttngconsumerd context */
3bd1e081 69static struct lttng_consumer_local_data *ctx;
cb040cc1 70
d4a1283e 71/*
6533b585 72 * Signal handler for the daemon
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73 */
74static void sighandler(int sig)
75{
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76 if (sig == SIGINT && sigintcount++ == 0) {
77 DBG("ignoring first SIGINT");
78 return;
79 }
80
3bd1e081 81 lttng_consumer_should_exit(ctx);
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82}
83
84/*
6533b585 85 * Setup signal handler for :
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86 * SIGINT, SIGTERM, SIGPIPE
87 */
88static 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
d4a1283e 120/*
3183dbb0 121 * Usage function on stream file.
d4a1283e 122 */
3183dbb0 123static void usage(FILE *fp)
d4a1283e 124{
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125 fprintf(fp, "Usage: %s OPTIONS\n\nOptions:\n", progname);
126 fprintf(fp, " -h, --help "
d4a1283e 127 "Display this usage.\n");
3183dbb0 128 fprintf(fp, " -c, --consumerd-cmd-sock PATH "
d4a1283e 129 "Specify path for the command socket\n");
3183dbb0 130 fprintf(fp, " -e, --consumerd-err-sock PATH "
d4a1283e 131 "Specify path for the error socket\n");
3183dbb0 132 fprintf(fp, " -d, --daemonize "
d4a1283e 133 "Start as a daemon.\n");
3183dbb0 134 fprintf(fp, " -q, --quiet "
d4a1283e 135 "No output at all.\n");
3183dbb0 136 fprintf(fp, " -v, --verbose "
d4a1283e 137 "Verbose mode. Activate DBG() macro.\n");
3183dbb0 138 fprintf(fp, " -V, --version "
d4a1283e 139 "Show version number.\n");
3183dbb0 140 fprintf(fp, " -k, --kernel "
3bd1e081 141 "Consumer kernel buffers (default).\n");
3183dbb0 142 fprintf(fp, " -u, --ust "
3bd1e081 143 "Consumer UST buffers.%s\n",
74d0b642 144#ifdef HAVE_LIBLTTNG_UST_CTL
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145 ""
146#else
147 " (support not compiled in)"
148#endif
149 );
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150}
151
152/*
153 * daemon argument parsing
154 */
155static void parse_args(int argc, char **argv)
156{
157 int c;
158
159 static struct option long_options[] = {
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160 { "consumerd-cmd-sock", 1, 0, 'c' },
161 { "consumerd-err-sock", 1, 0, 'e' },
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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' },
3bd1e081 167 { "kernel", 0, 0, 'k' },
74d0b642 168#ifdef HAVE_LIBLTTNG_UST_CTL
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169 { "ust", 0, 0, 'u' },
170#endif
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171 { NULL, 0, 0, 0 }
172 };
173
174 while (1) {
175 int option_index = 0;
3bd1e081 176 c = getopt_long(argc, argv, "dhqvVku" "c:e:", long_options, &option_index);
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177 if (c == -1) {
178 break;
179 }
180
181 switch (c) {
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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':
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198 usage(stdout);
199 exit(EXIT_SUCCESS);
914a571b 200 case 'q':
97e19046 201 lttng_opt_quiet = 1;
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202 break;
203 case 'v':
97e19046 204 lttng_opt_verbose = 1;
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205 break;
206 case 'V':
207 fprintf(stdout, "%s\n", VERSION);
208 exit(EXIT_SUCCESS);
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209 case 'k':
210 opt_type = LTTNG_CONSUMER_KERNEL;
211 break;
74d0b642 212#ifdef HAVE_LIBLTTNG_UST_CTL
3bd1e081 213 case 'u':
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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
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221 break;
222#endif
914a571b 223 default:
3183dbb0 224 usage(stderr);
914a571b 225 exit(EXIT_FAILURE);
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226 }
227 }
228}
229
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230/*
231 * main
232 */
233int 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) {
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253 switch (opt_type) {
254 case LTTNG_CONSUMER_KERNEL:
60922cb0 255 snprintf(command_sock_path, PATH_MAX, DEFAULT_KCONSUMERD_CMD_SOCK_PATH,
990570ed 256 DEFAULT_LTTNG_RUNDIR);
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257 break;
258 case LTTNG_CONSUMER64_UST:
67e40797 259 snprintf(command_sock_path, PATH_MAX,
60922cb0 260 DEFAULT_USTCONSUMERD64_CMD_SOCK_PATH, DEFAULT_LTTNG_RUNDIR);
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261 break;
262 case LTTNG_CONSUMER32_UST:
67e40797 263 snprintf(command_sock_path, PATH_MAX,
60922cb0 264 DEFAULT_USTCONSUMERD32_CMD_SOCK_PATH, DEFAULT_LTTNG_RUNDIR);
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265 break;
266 default:
267 WARN("Unknown consumerd type");
268 goto error;
269 }
d4a1283e 270 }
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271
272 /* Init */
273 lttng_consumer_init();
274
5348b470 275 /* create the consumer instance with and assign the callbacks */
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276 ctx = lttng_consumer_create(opt_type, lttng_consumer_read_subbuffer,
277 NULL, lttng_consumer_on_recv_stream, NULL);
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278 if (ctx == NULL) {
279 goto error;
280 }
281
3bd1e081 282 lttng_consumer_set_command_sock_path(ctx, command_sock_path);
d4a1283e 283 if (strlen(error_sock_path) == 0) {
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284 switch (opt_type) {
285 case LTTNG_CONSUMER_KERNEL:
60922cb0 286 snprintf(error_sock_path, PATH_MAX, DEFAULT_KCONSUMERD_ERR_SOCK_PATH,
990570ed 287 DEFAULT_LTTNG_RUNDIR);
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288 break;
289 case LTTNG_CONSUMER64_UST:
67e40797 290 snprintf(error_sock_path, PATH_MAX,
60922cb0 291 DEFAULT_USTCONSUMERD64_ERR_SOCK_PATH, DEFAULT_LTTNG_RUNDIR);
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292 break;
293 case LTTNG_CONSUMER32_UST:
67e40797 294 snprintf(error_sock_path, PATH_MAX,
60922cb0 295 DEFAULT_USTCONSUMERD32_ERR_SOCK_PATH, DEFAULT_LTTNG_RUNDIR);
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296 break;
297 default:
298 WARN("Unknown consumerd type");
299 goto error;
300 }
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301 }
302
303 if (set_signal_handler() < 0) {
304 goto error;
305 }
306
32258573 307 /* Connect to the socket created by lttng-sessiond to report errors */
d4a1283e 308 DBG("Connecting to error socket %s", error_sock_path);
1ce86c9a 309 ret = lttcomm_connect_unix_sock(error_sock_path);
32258573 310 /* not a fatal error, but all communication with lttng-sessiond will fail */
1ce86c9a 311 if (ret < 0) {
99bab54f 312 WARN("Cannot connect to error socket (is lttng-sessiond started?)");
d4a1283e 313 }
3bd1e081 314 lttng_consumer_set_error_sock(ctx, ret);
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315
316 /* Create the thread to manage the receive of fd */
3bd1e081 317 ret = pthread_create(&threads[0], NULL, lttng_consumer_thread_receive_fds,
cb040cc1 318 (void *) ctx);
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319 if (ret != 0) {
320 perror("pthread_create");
321 goto error;
322 }
323
324 /* Create thread to manage the polling/writing of traces */
3bd1e081 325 ret = pthread_create(&threads[1], NULL, lttng_consumer_thread_poll_fds,
cb040cc1 326 (void *) ctx);
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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;
3bd1e081 340 lttng_consumer_send_error(ctx, CONSUMERD_EXIT_SUCCESS);
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341 goto end;
342
343error:
344 ret = EXIT_FAILURE;
3bd1e081 345 lttng_consumer_send_error(ctx, CONSUMERD_EXIT_FAILURE);
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346
347end:
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348 lttng_consumer_destroy(ctx);
349 lttng_consumer_cleanup();
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350
351 return ret;
352}
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