Commit | Line | Data |
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826d496d MD |
1 | /* |
2 | * Copyright (c) 2011 David Goulet <david.goulet@polymtl.ca> | |
fac6795d DG |
3 | * |
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. | |
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. | |
fac6795d DG |
17 | */ |
18 | ||
19 | #define _GNU_SOURCE | |
fac6795d | 20 | #include <getopt.h> |
f3ed775e | 21 | #include <signal.h> |
fac6795d DG |
22 | #include <stdio.h> |
23 | #include <stdlib.h> | |
24 | #include <string.h> | |
fac6795d DG |
25 | #include <unistd.h> |
26 | ||
5b97ec60 | 27 | #include <lttng/lttng.h> |
fac6795d | 28 | |
f3ed775e | 29 | #include "cmd.h" |
beb8c75a | 30 | #include "conf.h" |
fac6795d DG |
31 | #include "lttngerr.h" |
32 | ||
33 | /* Variables */ | |
34 | static char *progname; | |
fac6795d | 35 | |
f3ed775e DG |
36 | int opt_quiet; |
37 | int opt_verbose; | |
38 | static int opt_no_sessiond; | |
39 | static char *opt_sessiond_path; | |
40 | ||
41 | enum { | |
42 | OPT_NO_SESSIOND, | |
43 | OPT_SESSION_PATH, | |
865abf65 SM |
44 | OPT_DUMP_OPTIONS, |
45 | OPT_DUMP_COMMANDS, | |
f3ed775e DG |
46 | }; |
47 | ||
48 | /* Getopt options. No first level command. */ | |
49 | static struct option long_options[] = { | |
50 | {"help", 0, NULL, 'h'}, | |
51 | {"group", 1, NULL, 'g'}, | |
52 | {"verbose", 0, NULL, 'v'}, | |
53 | {"quiet", 0, NULL, 'q'}, | |
54 | {"no-sessiond", 0, NULL, OPT_NO_SESSIOND}, | |
55 | {"sessiond-path", 1, NULL, OPT_SESSION_PATH}, | |
865abf65 SM |
56 | {"list-options", 0, NULL, OPT_DUMP_OPTIONS}, |
57 | {"list-commands", 0, NULL, OPT_DUMP_COMMANDS}, | |
f3ed775e DG |
58 | {NULL, 0, NULL, 0} |
59 | }; | |
60 | ||
61 | /* First level command */ | |
62 | static struct cmd_struct commands[] = { | |
63 | { "list", cmd_list}, | |
64 | { "create", cmd_create}, | |
65 | { "destroy", cmd_destroy}, | |
66 | { "add-channel", cmd_add_channel}, | |
67 | { "start", cmd_start}, | |
68 | { "stop", cmd_stop}, | |
69 | { "enable-event", cmd_enable_events}, | |
e953ef25 | 70 | { "disable-event", cmd_disable_events}, |
d36b8583 | 71 | { "enable-channel", cmd_enable_channels}, |
26cc6b4e | 72 | { "disable-channel", cmd_disable_channels}, |
d65106b1 | 73 | { "add-context", cmd_add_context}, |
3087ef18 | 74 | { "set-session", cmd_set_session}, |
eb9cb8b7 | 75 | { "version", cmd_version}, |
f3ed775e DG |
76 | { NULL, NULL} /* Array closure */ |
77 | }; | |
78 | ||
79 | static void usage(FILE *ofp) | |
8c0faa1d | 80 | { |
f3ed775e DG |
81 | fprintf(ofp, "LTTng Trace Control " VERSION"\n\n"); |
82 | fprintf(ofp, "usage: lttng [options] <command>\n"); | |
83 | fprintf(ofp, "\n"); | |
84 | fprintf(ofp, "Options:\n"); | |
85 | fprintf(ofp, " -h, --help Show this help\n"); | |
86 | fprintf(ofp, " -g, --group NAME Unix tracing group name. (default: tracing)\n"); | |
87 | fprintf(ofp, " -v, --verbose Verbose mode\n"); | |
88 | fprintf(ofp, " -q, --quiet Quiet mode\n"); | |
89 | fprintf(ofp, " --no-sessiond Don't spawn a session daemon\n"); | |
90 | fprintf(ofp, " --sessiond-path Session daemon full path\n"); | |
865abf65 SM |
91 | fprintf(ofp, " --list-options Simple listing of lttng options\n"); |
92 | fprintf(ofp, " --list-commands Simple listing of lttng commands\n"); | |
f3ed775e DG |
93 | fprintf(ofp, "\n"); |
94 | fprintf(ofp, "Commands:\n"); | |
95 | fprintf(ofp, " add-channel Add channel to tracer\n"); | |
d65106b1 | 96 | fprintf(ofp, " add-context Add context to event or/and channel\n"); |
f3ed775e DG |
97 | fprintf(ofp, " create Create tracing session\n"); |
98 | fprintf(ofp, " destroy Teardown tracing session\n"); | |
d36b8583 | 99 | fprintf(ofp, " enable-channel Enable tracing channel\n"); |
26cc6b4e DG |
100 | fprintf(ofp, " enable-event Enable tracing event\n"); |
101 | fprintf(ofp, " disable-channel Disable tracing channel\n"); | |
f3ed775e DG |
102 | fprintf(ofp, " disable-event Disable tracing event\n"); |
103 | fprintf(ofp, " list List possible tracing options\n"); | |
3087ef18 | 104 | fprintf(ofp, " set-session Set current session name\n"); |
f3ed775e DG |
105 | fprintf(ofp, " start Start tracing\n"); |
106 | fprintf(ofp, " stop Stop tracing\n"); | |
107 | fprintf(ofp, " version Show version information\n"); | |
108 | fprintf(ofp, "\n"); | |
109 | fprintf(ofp, "Please see the lttng(1) man page for full documentation.\n"); | |
110 | fprintf(ofp, "See http://lttng.org for updates, bug reports and news.\n"); | |
8c0faa1d DG |
111 | } |
112 | ||
865abf65 SM |
113 | /* |
114 | * list_options | |
115 | * | |
116 | * List options line by line. This is mostly for bash auto completion and to | |
117 | * avoid difficult parsing. | |
118 | */ | |
119 | static void list_options(FILE *ofp) | |
120 | { | |
121 | int i = 0; | |
122 | struct option *option = NULL; | |
123 | ||
124 | option = &long_options[i]; | |
125 | while (option->name != NULL) { | |
126 | fprintf(ofp, "--%s\n", option->name); | |
127 | ||
128 | if (isprint(option->val)) { | |
129 | fprintf(ofp, "-%c\n", option->val); | |
130 | } | |
131 | ||
132 | i++; | |
133 | option = &long_options[i]; | |
134 | } | |
135 | } | |
136 | ||
137 | /* | |
138 | * list_commands | |
139 | * | |
140 | * List commands line by line. This is mostly for bash auto completion and to | |
141 | * avoid difficult parsing. | |
142 | */ | |
143 | static void list_commands(FILE *ofp) | |
144 | { | |
145 | int i = 0; | |
146 | struct cmd_struct *cmd = NULL; | |
147 | ||
148 | cmd = &commands[i]; | |
149 | while (cmd->name != NULL) { | |
150 | fprintf(ofp, "%s\n", cmd->name); | |
151 | i++; | |
152 | cmd = &commands[i]; | |
153 | } | |
154 | } | |
155 | ||
7442b2ba | 156 | /* |
f3ed775e | 157 | * clean_exit |
96243366 | 158 | */ |
f3ed775e | 159 | static void clean_exit(int code) |
96243366 | 160 | { |
f3ed775e DG |
161 | DBG("Clean exit"); |
162 | exit(code); | |
894be886 | 163 | } |
96243366 | 164 | |
894be886 | 165 | /* |
f3ed775e | 166 | * sighandler |
2ef84c95 | 167 | * |
f3ed775e | 168 | * Signal handler for the daemon |
2ef84c95 | 169 | */ |
f3ed775e | 170 | static void sighandler(int sig) |
2ef84c95 | 171 | { |
f3ed775e DG |
172 | switch (sig) { |
173 | case SIGTERM: | |
174 | DBG("SIGTERM catched"); | |
175 | clean_exit(EXIT_FAILURE); | |
176 | break; | |
177 | case SIGCHLD: | |
178 | /* Notify is done */ | |
179 | DBG("SIGCHLD catched"); | |
180 | break; | |
181 | default: | |
182 | DBG("Unknown signal %d catched", sig); | |
183 | break; | |
2ef84c95 DG |
184 | } |
185 | ||
f3ed775e | 186 | return; |
2ef84c95 DG |
187 | } |
188 | ||
189 | /* | |
f3ed775e | 190 | * set_signal_handler |
894be886 | 191 | * |
f3ed775e | 192 | * Setup signal handler for SIGCHLD and SIGTERM. |
894be886 | 193 | */ |
f3ed775e | 194 | static int set_signal_handler(void) |
894be886 | 195 | { |
f3ed775e DG |
196 | int ret = 0; |
197 | struct sigaction sa; | |
198 | sigset_t sigset; | |
33a2b854 | 199 | |
f3ed775e DG |
200 | if ((ret = sigemptyset(&sigset)) < 0) { |
201 | perror("sigemptyset"); | |
33a2b854 DG |
202 | goto end; |
203 | } | |
204 | ||
f3ed775e DG |
205 | sa.sa_handler = sighandler; |
206 | sa.sa_mask = sigset; | |
207 | sa.sa_flags = 0; | |
208 | if ((ret = sigaction(SIGCHLD, &sa, NULL)) < 0) { | |
209 | perror("sigaction"); | |
96243366 DG |
210 | goto end; |
211 | } | |
212 | ||
f3ed775e DG |
213 | if ((ret = sigaction(SIGTERM, &sa, NULL)) < 0) { |
214 | perror("sigaction"); | |
215 | goto end; | |
894be886 DG |
216 | } |
217 | ||
96243366 | 218 | end: |
57167058 DG |
219 | return ret; |
220 | } | |
221 | ||
fac6795d | 222 | /* |
f3ed775e | 223 | * handle_command |
fac6795d | 224 | * |
f3ed775e DG |
225 | * Handle the full argv list of a first level command. Will find the command |
226 | * in the global commands array and call the function callback associated. | |
1c9f7941 | 227 | * |
f3ed775e DG |
228 | * If command not found, return -1 |
229 | * else, return function command error code. | |
1c9f7941 | 230 | */ |
f3ed775e | 231 | static int handle_command(int argc, char **argv) |
1c9f7941 | 232 | { |
f3ed775e DG |
233 | int i = 0, ret; |
234 | struct cmd_struct *cmd; | |
1c9f7941 | 235 | |
f3ed775e DG |
236 | if (*argv == NULL) { |
237 | ret = CMD_SUCCESS; | |
47b74d63 | 238 | goto end; |
1c9f7941 DG |
239 | } |
240 | ||
f3ed775e DG |
241 | cmd = &commands[i]; |
242 | while (cmd->func != NULL) { | |
243 | /* Find command */ | |
244 | if (strcmp(argv[0], cmd->name) == 0) { | |
245 | ret = cmd->func(argc, (const char**) argv); | |
246 | switch (ret) { | |
247 | case CMD_ERROR: | |
248 | ERR("Command error"); | |
249 | break; | |
250 | case CMD_NOT_IMPLEMENTED: | |
251 | ERR("Options not implemented"); | |
252 | break; | |
253 | case CMD_UNDEFINED: | |
254 | ERR("Undefined command"); | |
255 | break; | |
256 | case CMD_FATAL: | |
257 | ERR("Fatal error"); | |
258 | break; | |
259 | } | |
260 | goto end; | |
894be886 | 261 | } |
f3ed775e DG |
262 | i++; |
263 | cmd = &commands[i]; | |
894be886 DG |
264 | } |
265 | ||
f3ed775e DG |
266 | /* Command not found */ |
267 | ret = -1; | |
894be886 DG |
268 | |
269 | end: | |
f3ed775e | 270 | return ret; |
8548ff30 DG |
271 | } |
272 | ||
5b8719f5 DG |
273 | /* |
274 | * spawn_sessiond | |
275 | * | |
276 | * Spawn a session daemon by forking and execv. | |
277 | */ | |
278 | static int spawn_sessiond(char *pathname) | |
279 | { | |
280 | int ret = 0; | |
281 | pid_t pid; | |
282 | ||
f3ed775e | 283 | MSG("Spawning a session daemon"); |
5b8719f5 DG |
284 | pid = fork(); |
285 | if (pid == 0) { | |
5e16da05 MD |
286 | /* |
287 | * Spawn session daemon and tell | |
5b8719f5 DG |
288 | * it to signal us when ready. |
289 | */ | |
5e16da05 MD |
290 | execlp(pathname, "ltt-sessiond", "--sig-parent", "--quiet", NULL); |
291 | /* execlp only returns if error happened */ | |
292 | if (errno == ENOENT) { | |
293 | ERR("No session daemon found. Use --sessiond-path."); | |
294 | } else { | |
295 | perror("execlp"); | |
5b8719f5 | 296 | } |
5e16da05 MD |
297 | kill(getppid(), SIGTERM); /* unpause parent */ |
298 | exit(EXIT_FAILURE); | |
5b8719f5 DG |
299 | } else if (pid > 0) { |
300 | /* Wait for ltt-sessiond to start */ | |
301 | pause(); | |
302 | goto end; | |
303 | } else { | |
304 | perror("fork"); | |
305 | ret = -1; | |
306 | goto end; | |
307 | } | |
308 | ||
309 | end: | |
310 | return ret; | |
311 | } | |
312 | ||
fac6795d | 313 | /* |
f3ed775e | 314 | * check_sessiond |
fac6795d DG |
315 | * |
316 | * Check if the session daemon is available using | |
5b8719f5 DG |
317 | * the liblttngctl API for the check. If not, try to |
318 | * spawn a daemon. | |
fac6795d | 319 | */ |
f3ed775e | 320 | static int check_sessiond(void) |
fac6795d DG |
321 | { |
322 | int ret; | |
5e16da05 | 323 | char *pathname = NULL, *alloc_pathname = NULL; |
fac6795d | 324 | |
947308c4 DG |
325 | ret = lttng_session_daemon_alive(); |
326 | if (ret == 0) { /* not alive */ | |
5b8719f5 DG |
327 | /* Try command line option path */ |
328 | if (opt_sessiond_path != NULL) { | |
329 | ret = access(opt_sessiond_path, F_OK | X_OK); | |
330 | if (ret < 0) { | |
331 | ERR("No such file: %s", opt_sessiond_path); | |
332 | goto end; | |
333 | } | |
334 | pathname = opt_sessiond_path; | |
335 | } else { | |
336 | /* Try LTTNG_SESSIOND_PATH env variable */ | |
e8f07c63 | 337 | pathname = getenv(LTTNG_SESSIOND_PATH_ENV); |
5b8719f5 DG |
338 | } |
339 | ||
340 | /* Let's rock and roll */ | |
341 | if (pathname == NULL) { | |
5e16da05 | 342 | ret = asprintf(&alloc_pathname, "ltt-sessiond"); |
5b8719f5 DG |
343 | if (ret < 0) { |
344 | goto end; | |
345 | } | |
5e16da05 | 346 | pathname = alloc_pathname; |
5b8719f5 DG |
347 | } |
348 | ||
349 | ret = spawn_sessiond(pathname); | |
5e16da05 | 350 | free(alloc_pathname); |
5b8719f5 DG |
351 | if (ret < 0) { |
352 | ERR("Problem occurs when starting %s", pathname); | |
353 | goto end; | |
354 | } | |
fac6795d DG |
355 | } |
356 | ||
5b8719f5 | 357 | end: |
fac6795d DG |
358 | return ret; |
359 | } | |
360 | ||
5b8719f5 | 361 | /* |
f3ed775e | 362 | * parse_args |
5b8719f5 | 363 | * |
f3ed775e DG |
364 | * Parse command line arguments. |
365 | * Return 0 if OK, else -1 | |
5b8719f5 | 366 | */ |
f3ed775e | 367 | static int parse_args(int argc, char **argv) |
5b8719f5 | 368 | { |
f3ed775e | 369 | int opt, ret; |
5b8719f5 | 370 | |
f3ed775e DG |
371 | if (argc < 2) { |
372 | usage(stderr); | |
373 | clean_exit(EXIT_FAILURE); | |
5b8719f5 DG |
374 | } |
375 | ||
f3ed775e DG |
376 | while ((opt = getopt_long(argc, argv, "+hvqg:", long_options, NULL)) != -1) { |
377 | switch (opt) { | |
378 | case 'h': | |
379 | usage(stderr); | |
380 | goto error; | |
381 | case 'v': | |
382 | opt_verbose = 1; | |
383 | break; | |
384 | case 'q': | |
385 | opt_quiet = 1; | |
386 | break; | |
387 | case 'g': | |
388 | lttng_set_tracing_group(optarg); | |
389 | break; | |
390 | case OPT_NO_SESSIOND: | |
391 | opt_no_sessiond = 1; | |
392 | break; | |
393 | case OPT_SESSION_PATH: | |
394 | opt_sessiond_path = strdup(optarg); | |
395 | break; | |
865abf65 SM |
396 | case OPT_DUMP_OPTIONS: |
397 | list_options(stdout); | |
398 | ret = 0; | |
399 | goto error; | |
400 | case OPT_DUMP_COMMANDS: | |
401 | list_commands(stdout); | |
402 | ret = 0; | |
403 | goto error; | |
f3ed775e DG |
404 | default: |
405 | usage(stderr); | |
406 | goto error; | |
407 | } | |
5b8719f5 | 408 | } |
fac6795d | 409 | |
f3ed775e DG |
410 | /* If both options are specified, quiet wins */ |
411 | if (opt_verbose && opt_quiet) { | |
412 | opt_verbose = 0; | |
5b8719f5 DG |
413 | } |
414 | ||
f3ed775e DG |
415 | /* Spawn session daemon if needed */ |
416 | if (opt_no_sessiond == 0 && (check_sessiond() < 0)) { | |
417 | goto error; | |
5b8719f5 DG |
418 | } |
419 | ||
f3ed775e DG |
420 | /* No leftovers, print usage and quit */ |
421 | if ((argc - optind) == 0) { | |
422 | usage(stderr); | |
423 | goto error; | |
424 | } | |
7442b2ba | 425 | |
f3ed775e DG |
426 | /* |
427 | * Handle leftovers which is a first level command with the trailing | |
428 | * options. | |
429 | */ | |
430 | ret = handle_command(argc - optind, argv + optind); | |
431 | if (ret < 0) { | |
432 | if (ret == -1) { | |
433 | usage(stderr); | |
434 | goto error; | |
435 | } else { | |
436 | ERR("%s", lttng_get_readable_code(ret)); | |
437 | } | |
96243366 DG |
438 | } |
439 | ||
f3ed775e DG |
440 | return ret; |
441 | ||
442 | error: | |
443 | return -1; | |
fac6795d DG |
444 | } |
445 | ||
f3ed775e | 446 | |
fac6795d | 447 | /* |
5b8719f5 | 448 | * main |
fac6795d DG |
449 | */ |
450 | int main(int argc, char *argv[]) | |
451 | { | |
452 | int ret; | |
453 | ||
454 | progname = argv[0] ? argv[0] : "lttng"; | |
455 | ||
456 | /* For Mathieu Desnoyers aka Dr Tracing */ | |
457 | if (strncmp(progname, "drtrace", 7) == 0) { | |
458 | MSG("%c[%d;%dmWelcome back Dr Tracing!%c[%dm\n\n", 27,1,33,27,0); | |
459 | } | |
460 | ||
5b8719f5 DG |
461 | ret = set_signal_handler(); |
462 | if (ret < 0) { | |
87378cf5 | 463 | clean_exit(ret); |
5b8719f5 DG |
464 | } |
465 | ||
f3ed775e DG |
466 | ret = parse_args(argc, argv); |
467 | clean_exit(ret); | |
87378cf5 | 468 | |
fac6795d DG |
469 | return 0; |
470 | } |