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/consumer.h>
47 #include <common/sessiond-comm/sessiond-comm.h>
49 #include "lttng-consumerd.h"
51 /* TODO : support UST (all direct kernel-ctl accesses). */
53 /* the two threads (receive fd and poll) */
54 static pthread_t threads
[2];
56 /* to count the number of times the user pressed ctrl+c */
57 static int sigintcount
= 0;
59 /* Argument variables */
60 int lttng_opt_quiet
; /* not static in error.h */
61 int lttng_opt_verbose
; /* not static in error.h */
62 static int opt_daemon
;
63 static const char *progname
;
64 static char command_sock_path
[PATH_MAX
]; /* Global command socket path */
65 static char error_sock_path
[PATH_MAX
]; /* Global error path */
66 static enum lttng_consumer_type opt_type
= LTTNG_CONSUMER_KERNEL
;
68 /* the liblttngconsumerd context */
69 static struct lttng_consumer_local_data
*ctx
;
72 * Signal handler for the daemon
74 static void sighandler(int sig
)
76 if (sig
== SIGINT
&& sigintcount
++ == 0) {
77 DBG("ignoring first SIGINT");
81 lttng_consumer_should_exit(ctx
);
85 * Setup signal handler for :
86 * SIGINT, SIGTERM, SIGPIPE
88 static int set_signal_handler(void)
94 if ((ret
= sigemptyset(&sigset
)) < 0) {
95 perror("sigemptyset");
99 sa
.sa_handler
= sighandler
;
102 if ((ret
= sigaction(SIGTERM
, &sa
, NULL
)) < 0) {
107 if ((ret
= sigaction(SIGINT
, &sa
, NULL
)) < 0) {
112 if ((ret
= sigaction(SIGPIPE
, &sa
, NULL
)) < 0) {
121 * Usage function on stream file.
123 static void usage(FILE *fp
)
125 fprintf(fp
, "Usage: %s OPTIONS\n\nOptions:\n", progname
);
126 fprintf(fp
, " -h, --help "
127 "Display this usage.\n");
128 fprintf(fp
, " -c, --consumerd-cmd-sock PATH "
129 "Specify path for the command socket\n");
130 fprintf(fp
, " -e, --consumerd-err-sock PATH "
131 "Specify path for the error socket\n");
132 fprintf(fp
, " -d, --daemonize "
133 "Start as a daemon.\n");
134 fprintf(fp
, " -q, --quiet "
135 "No output at all.\n");
136 fprintf(fp
, " -v, --verbose "
137 "Verbose mode. Activate DBG() macro.\n");
138 fprintf(fp
, " -V, --version "
139 "Show version number.\n");
140 fprintf(fp
, " -k, --kernel "
141 "Consumer kernel buffers (default).\n");
142 fprintf(fp
, " -u, --ust "
143 "Consumer UST buffers.%s\n",
144 #ifdef HAVE_LIBLTTNG_UST_CTL
147 " (support not compiled in)"
153 * daemon argument parsing
155 static void parse_args(int argc
, char **argv
)
159 static struct option long_options
[] = {
160 { "consumerd-cmd-sock", 1, 0, 'c' },
161 { "consumerd-err-sock", 1, 0, 'e' },
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' },
167 { "kernel", 0, 0, 'k' },
168 #ifdef HAVE_LIBLTTNG_UST_CTL
169 { "ust", 0, 0, 'u' },
175 int option_index
= 0;
176 c
= getopt_long(argc
, argv
, "dhqvVku" "c:e:", long_options
, &option_index
);
183 fprintf(stderr
, "option %s", long_options
[option_index
].name
);
185 fprintf(stderr
, " with arg %s\n", optarg
);
189 snprintf(command_sock_path
, PATH_MAX
, "%s", optarg
);
192 snprintf(error_sock_path
, PATH_MAX
, "%s", optarg
);
204 lttng_opt_verbose
= 1;
207 fprintf(stdout
, "%s\n", VERSION
);
210 opt_type
= LTTNG_CONSUMER_KERNEL
;
212 #ifdef HAVE_LIBLTTNG_UST_CTL
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
;
219 # error "Unknown bitness"
231 * Set open files limit to unlimited. This daemon can open a large number of
232 * file descriptors in order to consumer multiple kernel traces.
234 static void set_ulimit(void)
239 /* The kernel does not allowed an infinite limit for open files */
240 lim
.rlim_cur
= 65535;
241 lim
.rlim_max
= 65535;
243 ret
= setrlimit(RLIMIT_NOFILE
, &lim
);
245 PERROR("failed to set open files limit");
252 int main(int argc
, char **argv
)
258 /* Parse arguments */
260 parse_args(argc
, argv
);
268 * child: setsid, close FD 0, 1, 2, chdir /
269 * parent: exit (if fork is successful)
277 * We are in the child. Make sure all other file
278 * descriptors are closed, in case we are called with
279 * more opened file descriptors than the standard ones.
281 for (i
= 3; i
< sysconf(_SC_OPEN_MAX
); i
++) {
286 if (strlen(command_sock_path
) == 0) {
288 case LTTNG_CONSUMER_KERNEL
:
289 snprintf(command_sock_path
, PATH_MAX
, DEFAULT_KCONSUMERD_CMD_SOCK_PATH
,
290 DEFAULT_LTTNG_RUNDIR
);
292 case LTTNG_CONSUMER64_UST
:
293 snprintf(command_sock_path
, PATH_MAX
,
294 DEFAULT_USTCONSUMERD64_CMD_SOCK_PATH
, DEFAULT_LTTNG_RUNDIR
);
296 case LTTNG_CONSUMER32_UST
:
297 snprintf(command_sock_path
, PATH_MAX
,
298 DEFAULT_USTCONSUMERD32_CMD_SOCK_PATH
, DEFAULT_LTTNG_RUNDIR
);
301 WARN("Unknown consumerd type");
307 lttng_consumer_init();
310 /* Set limit for open files */
314 /* create the consumer instance with and assign the callbacks */
315 ctx
= lttng_consumer_create(opt_type
, lttng_consumer_read_subbuffer
,
316 NULL
, lttng_consumer_on_recv_stream
, NULL
);
321 lttng_consumer_set_command_sock_path(ctx
, command_sock_path
);
322 if (strlen(error_sock_path
) == 0) {
324 case LTTNG_CONSUMER_KERNEL
:
325 snprintf(error_sock_path
, PATH_MAX
, DEFAULT_KCONSUMERD_ERR_SOCK_PATH
,
326 DEFAULT_LTTNG_RUNDIR
);
328 case LTTNG_CONSUMER64_UST
:
329 snprintf(error_sock_path
, PATH_MAX
,
330 DEFAULT_USTCONSUMERD64_ERR_SOCK_PATH
, DEFAULT_LTTNG_RUNDIR
);
332 case LTTNG_CONSUMER32_UST
:
333 snprintf(error_sock_path
, PATH_MAX
,
334 DEFAULT_USTCONSUMERD32_ERR_SOCK_PATH
, DEFAULT_LTTNG_RUNDIR
);
337 WARN("Unknown consumerd type");
342 if (set_signal_handler() < 0) {
346 /* Connect to the socket created by lttng-sessiond to report errors */
347 DBG("Connecting to error socket %s", error_sock_path
);
348 ret
= lttcomm_connect_unix_sock(error_sock_path
);
349 /* not a fatal error, but all communication with lttng-sessiond will fail */
351 WARN("Cannot connect to error socket (is lttng-sessiond started?)");
353 lttng_consumer_set_error_sock(ctx
, ret
);
355 /* Create the thread to manage the receive of fd */
356 ret
= pthread_create(&threads
[0], NULL
, lttng_consumer_thread_receive_fds
,
359 perror("pthread_create");
363 /* Create thread to manage the polling/writing of traces */
364 ret
= pthread_create(&threads
[1], NULL
, lttng_consumer_thread_poll_fds
,
367 perror("pthread_create");
371 for (i
= 0; i
< 2; i
++) {
372 ret
= pthread_join(threads
[i
], &status
);
374 perror("pthread_join");
379 lttng_consumer_send_error(ctx
, LTTCOMM_CONSUMERD_EXIT_SUCCESS
);
384 lttng_consumer_send_error(ctx
, LTTCOMM_CONSUMERD_EXIT_FAILURE
);
387 lttng_consumer_destroy(ctx
);
388 lttng_consumer_cleanup();