2 * Copyright (c) 2011 David Goulet <david.goulet@polymtl.ca>
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License as published by
6 * the Free Software Foundation; either version 2 of the License, or
7 * (at your option) any later version.
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.
27 #include <lttng/lttng.h>
34 static char *progname
;
38 static int opt_no_sessiond
;
39 static char *opt_sessiond_path
;
46 /* Getopt options. No first level command. */
47 static struct option long_options
[] = {
48 {"help", 0, NULL
, 'h'},
49 {"group", 1, NULL
, 'g'},
50 {"verbose", 0, NULL
, 'v'},
51 {"quiet", 0, NULL
, 'q'},
52 {"no-sessiond", 0, NULL
, OPT_NO_SESSIOND
},
53 {"sessiond-path", 1, NULL
, OPT_SESSION_PATH
},
57 /* First level command */
58 static struct cmd_struct commands
[] = {
60 { "create", cmd_create
},
61 { "destroy", cmd_destroy
},
62 { "add-channel", cmd_add_channel
},
63 { "start", cmd_start
},
65 { "enable-event", cmd_enable_events
},
66 { "disable-event", cmd_disable_events
},
67 { NULL
, NULL
} /* Array closure */
70 static void usage(FILE *ofp
)
72 fprintf(ofp
, "LTTng Trace Control " VERSION
"\n\n");
73 fprintf(ofp
, "usage: lttng [options] <command>\n");
75 fprintf(ofp
, "Options:\n");
76 fprintf(ofp
, " -h, --help Show this help\n");
77 fprintf(ofp
, " -g, --group NAME Unix tracing group name. (default: tracing)\n");
78 fprintf(ofp
, " -v, --verbose Verbose mode\n");
79 fprintf(ofp
, " -q, --quiet Quiet mode\n");
80 fprintf(ofp
, " --no-sessiond Don't spawn a session daemon\n");
81 fprintf(ofp
, " --sessiond-path Session daemon full path\n");
83 fprintf(ofp
, "Commands:\n");
84 fprintf(ofp
, " add-channel Add channel to tracer\n");
85 fprintf(ofp
, " create Create tracing session\n");
86 fprintf(ofp
, " destroy Teardown tracing session\n");
87 fprintf(ofp
, " enable-event Enable tracing event\n");
88 fprintf(ofp
, " disable-event Disable tracing event\n");
89 fprintf(ofp
, " list List possible tracing options\n");
90 fprintf(ofp
, " start Start tracing\n");
91 fprintf(ofp
, " stop Stop tracing\n");
92 fprintf(ofp
, " version Show version information\n");
94 fprintf(ofp
, "Please see the lttng(1) man page for full documentation.\n");
95 fprintf(ofp
, "See http://lttng.org for updates, bug reports and news.\n");
101 static void clean_exit(int code
)
110 * Signal handler for the daemon
112 static void sighandler(int sig
)
116 DBG("SIGTERM catched");
117 clean_exit(EXIT_FAILURE
);
121 DBG("SIGCHLD catched");
124 DBG("Unknown signal %d catched", sig
);
134 * Setup signal handler for SIGCHLD and SIGTERM.
136 static int set_signal_handler(void)
142 if ((ret
= sigemptyset(&sigset
)) < 0) {
143 perror("sigemptyset");
147 sa
.sa_handler
= sighandler
;
150 if ((ret
= sigaction(SIGCHLD
, &sa
, NULL
)) < 0) {
155 if ((ret
= sigaction(SIGTERM
, &sa
, NULL
)) < 0) {
167 * Handle the full argv list of a first level command. Will find the command
168 * in the global commands array and call the function callback associated.
170 * If command not found, return -1
171 * else, return function command error code.
173 static int handle_command(int argc
, char **argv
)
176 struct cmd_struct
*cmd
;
184 while (cmd
->func
!= NULL
) {
186 if (strcmp(argv
[0], cmd
->name
) == 0) {
187 ret
= cmd
->func(argc
, (const char**) argv
);
190 ERR("Command error");
192 case CMD_NOT_IMPLEMENTED
:
193 ERR("Options not implemented");
196 ERR("Undefined command");
208 /* Command not found */
218 * Spawn a session daemon by forking and execv.
220 static int spawn_sessiond(char *pathname
)
225 MSG("Spawning a session daemon");
229 * Spawn session daemon and tell
230 * it to signal us when ready.
232 execlp(pathname
, "ltt-sessiond", "--sig-parent", "--quiet", NULL
);
233 /* execlp only returns if error happened */
234 if (errno
== ENOENT
) {
235 ERR("No session daemon found. Use --sessiond-path.");
239 kill(getppid(), SIGTERM
); /* unpause parent */
241 } else if (pid
> 0) {
242 /* Wait for ltt-sessiond to start */
258 * Check if the session daemon is available using
259 * the liblttngctl API for the check. If not, try to
262 static int check_sessiond(void)
265 char *pathname
= NULL
, *alloc_pathname
= NULL
;
267 ret
= lttng_session_daemon_alive();
268 if (ret
== 0) { /* not alive */
269 /* Try command line option path */
270 if (opt_sessiond_path
!= NULL
) {
271 ret
= access(opt_sessiond_path
, F_OK
| X_OK
);
273 ERR("No such file: %s", opt_sessiond_path
);
276 pathname
= opt_sessiond_path
;
278 /* Try LTTNG_SESSIOND_PATH env variable */
279 pathname
= getenv(LTTNG_SESSIOND_PATH_ENV
);
282 /* Let's rock and roll */
283 if (pathname
== NULL
) {
284 ret
= asprintf(&alloc_pathname
, "ltt-sessiond");
288 pathname
= alloc_pathname
;
291 ret
= spawn_sessiond(pathname
);
292 free(alloc_pathname
);
294 ERR("Problem occurs when starting %s", pathname
);
306 * Parse command line arguments.
307 * Return 0 if OK, else -1
309 static int parse_args(int argc
, char **argv
)
315 clean_exit(EXIT_FAILURE
);
318 while ((opt
= getopt_long(argc
, argv
, "+hvqg:", long_options
, NULL
)) != -1) {
330 lttng_set_tracing_group(optarg
);
332 case OPT_NO_SESSIOND
:
335 case OPT_SESSION_PATH
:
336 opt_sessiond_path
= strdup(optarg
);
344 /* If both options are specified, quiet wins */
345 if (opt_verbose
&& opt_quiet
) {
349 /* Spawn session daemon if needed */
350 if (opt_no_sessiond
== 0 && (check_sessiond() < 0)) {
354 /* No leftovers, print usage and quit */
355 if ((argc
- optind
) == 0) {
361 * Handle leftovers which is a first level command with the trailing
364 ret
= handle_command(argc
- optind
, argv
+ optind
);
370 ERR("%s", lttng_get_readable_code(ret
));
384 int main(int argc
, char *argv
[])
388 progname
= argv
[0] ? argv
[0] : "lttng";
390 /* For Mathieu Desnoyers aka Dr Tracing */
391 if (strncmp(progname
, "drtrace", 7) == 0) {
392 MSG("%c[%d;%dmWelcome back Dr Tracing!%c[%dm\n\n", 27,1,33,27,0);
395 ret
= set_signal_handler();
400 ret
= parse_args(argc
, argv
);
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