consumerd: register threads to health monitoring
[lttng-tools.git] / src / bin / lttng-consumerd / lttng-consumerd.c
... / ...
CommitLineData
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/consumer-timer.h>
48#include <common/compat/poll.h>
49#include <common/sessiond-comm/sessiond-comm.h>
50
51#include "lttng-consumerd.h"
52#include "health-consumerd.h"
53
54/* TODO : support UST (all direct kernel-ctl accesses). */
55
56/* threads (channel handling, poll, metadata, sessiond) */
57
58static pthread_t channel_thread, data_thread, metadata_thread, sessiond_thread;
59static pthread_t metadata_timer_thread;
60
61/* to count the number of times the user pressed ctrl+c */
62static int sigintcount = 0;
63
64/* Argument variables */
65int lttng_opt_quiet; /* not static in error.h */
66int lttng_opt_verbose; /* not static in error.h */
67static int opt_daemon;
68static const char *progname;
69static char command_sock_path[PATH_MAX]; /* Global command socket path */
70static char error_sock_path[PATH_MAX]; /* Global error path */
71static enum lttng_consumer_type opt_type = LTTNG_CONSUMER_KERNEL;
72
73/* the liblttngconsumerd context */
74static struct lttng_consumer_local_data *ctx;
75
76/* Consumerd health monitoring */
77struct health_app *health_consumerd;
78
79/*
80 * Signal handler for the daemon
81 */
82static void sighandler(int sig)
83{
84 if (sig == SIGINT && sigintcount++ == 0) {
85 DBG("ignoring first SIGINT");
86 return;
87 }
88
89 /*
90 * Ignore SIGPIPE because it should not stop the consumer whenever a
91 * SIGPIPE is catched through a FD operation.
92 */
93 if (sig == SIGPIPE) {
94 return;
95 }
96
97 lttng_consumer_should_exit(ctx);
98}
99
100/*
101 * Setup signal handler for :
102 * SIGINT, SIGTERM, SIGPIPE
103 */
104static int set_signal_handler(void)
105{
106 int ret = 0;
107 struct sigaction sa;
108 sigset_t sigset;
109
110 if ((ret = sigemptyset(&sigset)) < 0) {
111 perror("sigemptyset");
112 return ret;
113 }
114
115 sa.sa_handler = sighandler;
116 sa.sa_mask = sigset;
117 sa.sa_flags = 0;
118 if ((ret = sigaction(SIGTERM, &sa, NULL)) < 0) {
119 perror("sigaction");
120 return ret;
121 }
122
123 if ((ret = sigaction(SIGINT, &sa, NULL)) < 0) {
124 perror("sigaction");
125 return ret;
126 }
127
128 if ((ret = sigaction(SIGPIPE, &sa, NULL)) < 0) {
129 perror("sigaction");
130 return ret;
131 }
132
133 return ret;
134}
135
136/*
137 * Usage function on stream file.
138 */
139static void usage(FILE *fp)
140{
141 fprintf(fp, "Usage: %s OPTIONS\n\nOptions:\n", progname);
142 fprintf(fp, " -h, --help "
143 "Display this usage.\n");
144 fprintf(fp, " -c, --consumerd-cmd-sock PATH "
145 "Specify path for the command socket\n");
146 fprintf(fp, " -e, --consumerd-err-sock PATH "
147 "Specify path for the error socket\n");
148 fprintf(fp, " -d, --daemonize "
149 "Start as a daemon.\n");
150 fprintf(fp, " -q, --quiet "
151 "No output at all.\n");
152 fprintf(fp, " -v, --verbose "
153 "Verbose mode. Activate DBG() macro.\n");
154 fprintf(fp, " -V, --version "
155 "Show version number.\n");
156 fprintf(fp, " -k, --kernel "
157 "Consumer kernel buffers (default).\n");
158 fprintf(fp, " -u, --ust "
159 "Consumer UST buffers.%s\n",
160#ifdef HAVE_LIBLTTNG_UST_CTL
161 ""
162#else
163 " (support not compiled in)"
164#endif
165 );
166}
167
168/*
169 * daemon argument parsing
170 */
171static void parse_args(int argc, char **argv)
172{
173 int c;
174
175 static struct option long_options[] = {
176 { "consumerd-cmd-sock", 1, 0, 'c' },
177 { "consumerd-err-sock", 1, 0, 'e' },
178 { "daemonize", 0, 0, 'd' },
179 { "help", 0, 0, 'h' },
180 { "quiet", 0, 0, 'q' },
181 { "verbose", 0, 0, 'v' },
182 { "version", 0, 0, 'V' },
183 { "kernel", 0, 0, 'k' },
184#ifdef HAVE_LIBLTTNG_UST_CTL
185 { "ust", 0, 0, 'u' },
186#endif
187 { NULL, 0, 0, 0 }
188 };
189
190 while (1) {
191 int option_index = 0;
192 c = getopt_long(argc, argv, "dhqvVku" "c:e:", long_options, &option_index);
193 if (c == -1) {
194 break;
195 }
196
197 switch (c) {
198 case 0:
199 fprintf(stderr, "option %s", long_options[option_index].name);
200 if (optarg) {
201 fprintf(stderr, " with arg %s\n", optarg);
202 }
203 break;
204 case 'c':
205 snprintf(command_sock_path, PATH_MAX, "%s", optarg);
206 break;
207 case 'e':
208 snprintf(error_sock_path, PATH_MAX, "%s", optarg);
209 break;
210 case 'd':
211 opt_daemon = 1;
212 break;
213 case 'h':
214 usage(stdout);
215 exit(EXIT_SUCCESS);
216 case 'q':
217 lttng_opt_quiet = 1;
218 break;
219 case 'v':
220 lttng_opt_verbose = 1;
221 break;
222 case 'V':
223 fprintf(stdout, "%s\n", VERSION);
224 exit(EXIT_SUCCESS);
225 case 'k':
226 opt_type = LTTNG_CONSUMER_KERNEL;
227 break;
228#ifdef HAVE_LIBLTTNG_UST_CTL
229 case 'u':
230# if (CAA_BITS_PER_LONG == 64)
231 opt_type = LTTNG_CONSUMER64_UST;
232# elif (CAA_BITS_PER_LONG == 32)
233 opt_type = LTTNG_CONSUMER32_UST;
234# else
235# error "Unknown bitness"
236# endif
237 break;
238#endif
239 default:
240 usage(stderr);
241 exit(EXIT_FAILURE);
242 }
243 }
244}
245
246/*
247 * Set open files limit to unlimited. This daemon can open a large number of
248 * file descriptors in order to consumer multiple kernel traces.
249 */
250static void set_ulimit(void)
251{
252 int ret;
253 struct rlimit lim;
254
255 /* The kernel does not allowed an infinite limit for open files */
256 lim.rlim_cur = 65535;
257 lim.rlim_max = 65535;
258
259 ret = setrlimit(RLIMIT_NOFILE, &lim);
260 if (ret < 0) {
261 PERROR("failed to set open files limit");
262 }
263}
264
265/*
266 * main
267 */
268int main(int argc, char **argv)
269{
270 int ret = 0;
271 void *status;
272
273 /* Parse arguments */
274 progname = argv[0];
275 parse_args(argc, argv);
276
277 /* Daemonize */
278 if (opt_daemon) {
279 int i;
280
281 /*
282 * fork
283 * child: setsid, close FD 0, 1, 2, chdir /
284 * parent: exit (if fork is successful)
285 */
286 ret = daemon(0, 0);
287 if (ret < 0) {
288 PERROR("daemon");
289 goto error;
290 }
291 /*
292 * We are in the child. Make sure all other file
293 * descriptors are closed, in case we are called with
294 * more opened file descriptors than the standard ones.
295 */
296 for (i = 3; i < sysconf(_SC_OPEN_MAX); i++) {
297 (void) close(i);
298 }
299 }
300
301 /* Set up max poll set size */
302 lttng_poll_set_max_size();
303
304 if (*command_sock_path == '\0') {
305 switch (opt_type) {
306 case LTTNG_CONSUMER_KERNEL:
307 snprintf(command_sock_path, PATH_MAX, DEFAULT_KCONSUMERD_CMD_SOCK_PATH,
308 DEFAULT_LTTNG_RUNDIR);
309 break;
310 case LTTNG_CONSUMER64_UST:
311 snprintf(command_sock_path, PATH_MAX,
312 DEFAULT_USTCONSUMERD64_CMD_SOCK_PATH, DEFAULT_LTTNG_RUNDIR);
313 break;
314 case LTTNG_CONSUMER32_UST:
315 snprintf(command_sock_path, PATH_MAX,
316 DEFAULT_USTCONSUMERD32_CMD_SOCK_PATH, DEFAULT_LTTNG_RUNDIR);
317 break;
318 default:
319 WARN("Unknown consumerd type");
320 goto error;
321 }
322 }
323
324 /* Init */
325 lttng_consumer_init();
326
327 if (!getuid()) {
328 /* Set limit for open files */
329 set_ulimit();
330 }
331
332 health_consumerd = health_app_create(NR_HEALTH_CONSUMERD_TYPES);
333 if (!health_consumerd) {
334 goto error;
335 }
336
337 /* create the consumer instance with and assign the callbacks */
338 ctx = lttng_consumer_create(opt_type, lttng_consumer_read_subbuffer,
339 NULL, lttng_consumer_on_recv_stream, NULL);
340 if (ctx == NULL) {
341 goto error;
342 }
343
344 lttng_consumer_set_command_sock_path(ctx, command_sock_path);
345 if (*error_sock_path == '\0') {
346 switch (opt_type) {
347 case LTTNG_CONSUMER_KERNEL:
348 snprintf(error_sock_path, PATH_MAX, DEFAULT_KCONSUMERD_ERR_SOCK_PATH,
349 DEFAULT_LTTNG_RUNDIR);
350 break;
351 case LTTNG_CONSUMER64_UST:
352 snprintf(error_sock_path, PATH_MAX,
353 DEFAULT_USTCONSUMERD64_ERR_SOCK_PATH, DEFAULT_LTTNG_RUNDIR);
354 break;
355 case LTTNG_CONSUMER32_UST:
356 snprintf(error_sock_path, PATH_MAX,
357 DEFAULT_USTCONSUMERD32_ERR_SOCK_PATH, DEFAULT_LTTNG_RUNDIR);
358 break;
359 default:
360 WARN("Unknown consumerd type");
361 goto error;
362 }
363 }
364
365 if (set_signal_handler() < 0) {
366 goto error;
367 }
368
369 /* Connect to the socket created by lttng-sessiond to report errors */
370 DBG("Connecting to error socket %s", error_sock_path);
371 ret = lttcomm_connect_unix_sock(error_sock_path);
372 /* not a fatal error, but all communication with lttng-sessiond will fail */
373 if (ret < 0) {
374 WARN("Cannot connect to error socket (is lttng-sessiond started?)");
375 }
376 lttng_consumer_set_error_sock(ctx, ret);
377
378 /*
379 * Block RT signals used for UST periodical metadata flush and the live
380 * timer in main, and create a dedicated thread to handle these signals.
381 */
382 consumer_signal_init();
383
384 ctx->type = opt_type;
385
386 /* Initialize communication library */
387 lttcomm_init();
388
389 /* Create thread to manage channels */
390 ret = pthread_create(&channel_thread, NULL, consumer_thread_channel_poll,
391 (void *) ctx);
392 if (ret != 0) {
393 perror("pthread_create");
394 goto error;
395 }
396
397 /* Create thread to manage the polling/writing of trace metadata */
398 ret = pthread_create(&metadata_thread, NULL, consumer_thread_metadata_poll,
399 (void *) ctx);
400 if (ret != 0) {
401 perror("pthread_create");
402 goto metadata_error;
403 }
404
405 /* Create thread to manage the polling/writing of trace data */
406 ret = pthread_create(&data_thread, NULL, consumer_thread_data_poll,
407 (void *) ctx);
408 if (ret != 0) {
409 perror("pthread_create");
410 goto data_error;
411 }
412
413 /* Create the thread to manage the receive of fd */
414 ret = pthread_create(&sessiond_thread, NULL, consumer_thread_sessiond_poll,
415 (void *) ctx);
416 if (ret != 0) {
417 perror("pthread_create");
418 goto sessiond_error;
419 }
420
421 /*
422 * Create the thread to manage the UST metadata periodic timer and
423 * live timer.
424 */
425 ret = pthread_create(&metadata_timer_thread, NULL,
426 consumer_timer_thread, (void *) ctx);
427 if (ret != 0) {
428 perror("pthread_create");
429 goto metadata_timer_error;
430 }
431
432 ret = pthread_detach(metadata_timer_thread);
433 if (ret) {
434 errno = ret;
435 perror("pthread_detach");
436 }
437
438metadata_timer_error:
439 ret = pthread_join(sessiond_thread, &status);
440 if (ret != 0) {
441 perror("pthread_join");
442 goto error;
443 }
444
445sessiond_error:
446 ret = pthread_join(data_thread, &status);
447 if (ret != 0) {
448 perror("pthread_join");
449 goto error;
450 }
451
452data_error:
453 ret = pthread_join(metadata_thread, &status);
454 if (ret != 0) {
455 perror("pthread_join");
456 goto error;
457 }
458
459metadata_error:
460 ret = pthread_join(channel_thread, &status);
461 if (ret != 0) {
462 perror("pthread_join");
463 goto error;
464 }
465
466 if (!ret) {
467 ret = EXIT_SUCCESS;
468 lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_EXIT_SUCCESS);
469 goto end;
470 }
471
472error:
473 ret = EXIT_FAILURE;
474 if (ctx) {
475 lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_EXIT_FAILURE);
476 }
477
478end:
479 lttng_consumer_destroy(ctx);
480 lttng_consumer_cleanup();
481 if (health_consumerd) {
482 health_app_destroy(health_consumerd);
483 }
484
485 return ret;
486}
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