2 * Copyright (C) 2011 - Julien Desfossez <julien.desfossez@polymtl.ca>
3 * Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
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.
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.
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.
30 #include <sys/resource.h>
32 #include <sys/socket.h>
34 #include <sys/types.h>
35 #include <urcu/list.h>
41 #include <urcu/compiler.h>
44 #include <common/defaults.h>
45 #include <common/common.h>
46 #include <common/kernel-consumer/kernel-consumer.h>
47 #include <common/kernel-ctl/kernel-ctl.h>
48 #include <common/sessiond-comm/sessiond-comm.h>
49 #include <common/ust-consumer/ust-consumer.h>
51 #include "lttng-consumerd.h"
53 /* TODO : support UST (all direct kernel-ctl accesses). */
55 /* the two threads (receive fd and poll) */
56 static pthread_t threads
[2];
58 /* to count the number of times the user pressed ctrl+c */
59 static int sigintcount
= 0;
61 /* Argument variables */
62 int lttng_opt_quiet
; /* not static in error.h */
63 int lttng_opt_verbose
; /* not static in error.h */
64 static int opt_daemon
;
65 static const char *progname
;
66 static char command_sock_path
[PATH_MAX
]; /* Global command socket path */
67 static char error_sock_path
[PATH_MAX
]; /* Global error path */
68 static enum lttng_consumer_type opt_type
= LTTNG_CONSUMER_KERNEL
;
70 /* the liblttngconsumerd context */
71 static struct lttng_consumer_local_data
*ctx
;
74 * Signal handler for the daemon
76 static void sighandler(int sig
)
78 if (sig
== SIGINT
&& sigintcount
++ == 0) {
79 DBG("ignoring first SIGINT");
83 lttng_consumer_should_exit(ctx
);
87 * Setup signal handler for :
88 * SIGINT, SIGTERM, SIGPIPE
90 static int set_signal_handler(void)
96 if ((ret
= sigemptyset(&sigset
)) < 0) {
97 perror("sigemptyset");
101 sa
.sa_handler
= sighandler
;
104 if ((ret
= sigaction(SIGTERM
, &sa
, NULL
)) < 0) {
109 if ((ret
= sigaction(SIGINT
, &sa
, NULL
)) < 0) {
114 if ((ret
= sigaction(SIGPIPE
, &sa
, NULL
)) < 0) {
123 * Usage function on stream file.
125 static void usage(FILE *fp
)
127 fprintf(fp
, "Usage: %s OPTIONS\n\nOptions:\n", progname
);
128 fprintf(fp
, " -h, --help "
129 "Display this usage.\n");
130 fprintf(fp
, " -c, --consumerd-cmd-sock PATH "
131 "Specify path for the command socket\n");
132 fprintf(fp
, " -e, --consumerd-err-sock PATH "
133 "Specify path for the error socket\n");
134 fprintf(fp
, " -d, --daemonize "
135 "Start as a daemon.\n");
136 fprintf(fp
, " -q, --quiet "
137 "No output at all.\n");
138 fprintf(fp
, " -v, --verbose "
139 "Verbose mode. Activate DBG() macro.\n");
140 fprintf(fp
, " -V, --version "
141 "Show version number.\n");
142 fprintf(fp
, " -k, --kernel "
143 "Consumer kernel buffers (default).\n");
144 fprintf(fp
, " -u, --ust "
145 "Consumer UST buffers.%s\n",
146 #ifdef HAVE_LIBLTTNG_UST_CTL
149 " (support not compiled in)"
155 * daemon argument parsing
157 static void parse_args(int argc
, char **argv
)
161 static struct option long_options
[] = {
162 { "consumerd-cmd-sock", 1, 0, 'c' },
163 { "consumerd-err-sock", 1, 0, 'e' },
164 { "daemonize", 0, 0, 'd' },
165 { "help", 0, 0, 'h' },
166 { "quiet", 0, 0, 'q' },
167 { "verbose", 0, 0, 'v' },
168 { "version", 0, 0, 'V' },
169 { "kernel", 0, 0, 'k' },
170 #ifdef HAVE_LIBLTTNG_UST_CTL
171 { "ust", 0, 0, 'u' },
177 int option_index
= 0;
178 c
= getopt_long(argc
, argv
, "dhqvVku" "c:e:", long_options
, &option_index
);
185 fprintf(stderr
, "option %s", long_options
[option_index
].name
);
187 fprintf(stderr
, " with arg %s\n", optarg
);
191 snprintf(command_sock_path
, PATH_MAX
, "%s", optarg
);
194 snprintf(error_sock_path
, PATH_MAX
, "%s", optarg
);
206 lttng_opt_verbose
= 1;
209 fprintf(stdout
, "%s\n", VERSION
);
212 opt_type
= LTTNG_CONSUMER_KERNEL
;
214 #ifdef HAVE_LIBLTTNG_UST_CTL
216 # if (CAA_BITS_PER_LONG == 64)
217 opt_type
= LTTNG_CONSUMER64_UST
;
218 # elif (CAA_BITS_PER_LONG == 32)
219 opt_type
= LTTNG_CONSUMER32_UST
;
221 # error "Unknown bitness"
233 * Set open files limit to unlimited. This daemon can open a large number of
234 * file descriptors in order to consumer multiple kernel traces.
236 static void set_ulimit(void)
241 /* The kernel does not allowed an infinite limit for open files */
242 lim
.rlim_cur
= 65535;
243 lim
.rlim_max
= 65535;
245 ret
= setrlimit(RLIMIT_NOFILE
, &lim
);
247 PERROR("failed to set open files limit");
254 int main(int argc
, char **argv
)
260 /* Parse arguments */
262 parse_args(argc
, argv
);
270 * child: setsid, close FD 0, 1, 2, chdir /
271 * parent: exit (if fork is successful)
279 * We are in the child. Make sure all other file
280 * descriptors are closed, in case we are called with
281 * more opened file descriptors than the standard ones.
283 for (i
= 3; i
< sysconf(_SC_OPEN_MAX
); i
++) {
288 if (strlen(command_sock_path
) == 0) {
290 case LTTNG_CONSUMER_KERNEL
:
291 snprintf(command_sock_path
, PATH_MAX
, DEFAULT_KCONSUMERD_CMD_SOCK_PATH
,
292 DEFAULT_LTTNG_RUNDIR
);
294 case LTTNG_CONSUMER64_UST
:
295 snprintf(command_sock_path
, PATH_MAX
,
296 DEFAULT_USTCONSUMERD64_CMD_SOCK_PATH
, DEFAULT_LTTNG_RUNDIR
);
298 case LTTNG_CONSUMER32_UST
:
299 snprintf(command_sock_path
, PATH_MAX
,
300 DEFAULT_USTCONSUMERD32_CMD_SOCK_PATH
, DEFAULT_LTTNG_RUNDIR
);
303 WARN("Unknown consumerd type");
309 lttng_consumer_init();
312 /* Set limit for open files */
316 /* create the consumer instance with and assign the callbacks */
317 ctx
= lttng_consumer_create(opt_type
, lttng_consumer_read_subbuffer
,
318 NULL
, lttng_consumer_on_recv_stream
, NULL
);
323 lttng_consumer_set_command_sock_path(ctx
, command_sock_path
);
324 if (strlen(error_sock_path
) == 0) {
326 case LTTNG_CONSUMER_KERNEL
:
327 snprintf(error_sock_path
, PATH_MAX
, DEFAULT_KCONSUMERD_ERR_SOCK_PATH
,
328 DEFAULT_LTTNG_RUNDIR
);
330 case LTTNG_CONSUMER64_UST
:
331 snprintf(error_sock_path
, PATH_MAX
,
332 DEFAULT_USTCONSUMERD64_ERR_SOCK_PATH
, DEFAULT_LTTNG_RUNDIR
);
334 case LTTNG_CONSUMER32_UST
:
335 snprintf(error_sock_path
, PATH_MAX
,
336 DEFAULT_USTCONSUMERD32_ERR_SOCK_PATH
, DEFAULT_LTTNG_RUNDIR
);
339 WARN("Unknown consumerd type");
344 if (set_signal_handler() < 0) {
348 /* Connect to the socket created by lttng-sessiond to report errors */
349 DBG("Connecting to error socket %s", error_sock_path
);
350 ret
= lttcomm_connect_unix_sock(error_sock_path
);
351 /* not a fatal error, but all communication with lttng-sessiond will fail */
353 WARN("Cannot connect to error socket (is lttng-sessiond started?)");
355 lttng_consumer_set_error_sock(ctx
, ret
);
357 /* Create the thread to manage the receive of fd */
358 ret
= pthread_create(&threads
[0], NULL
, lttng_consumer_thread_receive_fds
,
361 perror("pthread_create");
365 /* Create thread to manage the polling/writing of traces */
366 ret
= pthread_create(&threads
[1], NULL
, lttng_consumer_thread_poll_fds
,
369 perror("pthread_create");
373 for (i
= 0; i
< 2; i
++) {
374 ret
= pthread_join(threads
[i
], &status
);
376 perror("pthread_join");
381 lttng_consumer_send_error(ctx
, CONSUMERD_EXIT_SUCCESS
);
386 lttng_consumer_send_error(ctx
, CONSUMERD_EXIT_FAILURE
);
389 lttng_consumer_destroy(ctx
);
390 lttng_consumer_cleanup();