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 | |
20 | #include <errno.h> | |
21 | #include <fcntl.h> | |
22 | #include <getopt.h> | |
23 | #include <grp.h> | |
24 | #include <limits.h> | |
25 | #include <stdio.h> | |
26 | #include <stdlib.h> | |
27 | #include <string.h> | |
28 | #include <sys/stat.h> | |
29 | #include <sys/types.h> | |
30 | #include <sys/wait.h> | |
31 | #include <unistd.h> | |
32 | ||
5b97ec60 | 33 | #include <lttng/lttng.h> |
fac6795d DG |
34 | |
35 | #include "lttng.h" | |
36 | #include "lttngerr.h" | |
37 | ||
38 | /* Variables */ | |
39 | static char *progname; | |
96243366 | 40 | static char *session_name; |
96243366 | 41 | static uuid_t current_uuid; |
894be886 DG |
42 | static int auto_session; |
43 | static int auto_trace; | |
fac6795d DG |
44 | |
45 | /* Prototypes */ | |
46 | static int process_client_opt(void); | |
47 | static int process_opt_list_apps(void); | |
57167058 | 48 | static int process_opt_list_sessions(void); |
1657e9bb | 49 | static int process_opt_list_traces(void); |
aaf97519 | 50 | static int process_opt_create_session(void); |
894be886 DG |
51 | static int process_kernel_create_trace(void); |
52 | static int process_opt_kernel_event(void); | |
96243366 | 53 | static int set_session_uuid(void); |
5b8719f5 DG |
54 | static void sighandler(int sig); |
55 | static int set_signal_handler(void); | |
8548ff30 | 56 | static int validate_options(void); |
47b74d63 | 57 | static char *get_cmdline_by_pid(pid_t pid); |
96243366 | 58 | static void set_opt_session_info(void); |
fac6795d DG |
59 | |
60 | /* | |
61 | * start_client | |
62 | * | |
63 | * Process client request from the command line | |
64 | * options. Every tracing action is done by the | |
65 | * liblttngctl API. | |
66 | */ | |
67 | static int process_client_opt(void) | |
68 | { | |
69 | int ret; | |
96243366 DG |
70 | |
71 | set_opt_session_info(); | |
fac6795d | 72 | |
fac6795d DG |
73 | if (opt_list_apps) { |
74 | ret = process_opt_list_apps(); | |
75 | if (ret < 0) { | |
fac6795d DG |
76 | goto end; |
77 | } | |
894be886 | 78 | goto error; |
fac6795d DG |
79 | } |
80 | ||
57167058 DG |
81 | if (opt_list_session) { |
82 | ret = process_opt_list_sessions(); | |
83 | if (ret < 0) { | |
84 | goto end; | |
85 | } | |
894be886 | 86 | goto error; |
57167058 DG |
87 | } |
88 | ||
894be886 DG |
89 | /* Session creation or auto session set on */ |
90 | if (auto_session || opt_create_session) { | |
91 | DBG("Creating a new session"); | |
92 | ret = process_opt_create_session(); | |
1657e9bb DG |
93 | if (ret < 0) { |
94 | goto end; | |
95 | } | |
96 | } | |
97 | ||
894be886 DG |
98 | ret = set_session_uuid(); |
99 | if (ret < 0) { | |
100 | ERR("Session %s not found", opt_session_name); | |
101 | goto error; | |
102 | } | |
aaf97519 | 103 | |
894be886 DG |
104 | if (opt_destroy_session) { |
105 | ret = lttng_destroy_session(¤t_uuid); | |
8028d920 | 106 | if (ret < 0) { |
894be886 | 107 | goto end; |
8028d920 | 108 | } |
894be886 | 109 | MSG("Session %s destroyed.", opt_session_name); |
8028d920 DG |
110 | } |
111 | ||
96243366 DG |
112 | if (opt_list_traces) { |
113 | ret = process_opt_list_traces(); | |
7442b2ba | 114 | if (ret < 0) { |
96243366 | 115 | goto end; |
7442b2ba | 116 | } |
e8be5f4f DG |
117 | } |
118 | ||
96243366 DG |
119 | /* |
120 | * Action on traces (kernel or/and userspace). | |
121 | */ | |
894be886 | 122 | |
ad874cce | 123 | if (opt_trace_kernel) { |
894be886 DG |
124 | if (auto_trace || opt_create_trace) { |
125 | DBG("Creating a kernel trace"); | |
126 | ret = process_kernel_create_trace(); | |
127 | if (ret < 0) { | |
128 | goto end; | |
129 | } | |
130 | } | |
131 | ||
132 | if (opt_event_list != NULL) { | |
133 | ret = process_opt_kernel_event(); | |
134 | } else { | |
135 | // Enable all events | |
136 | } | |
137 | ||
138 | goto error; | |
df0da139 DG |
139 | } |
140 | ||
ad874cce | 141 | if (opt_trace_pid != 0) { |
894be886 | 142 | if (auto_trace || opt_create_trace) { |
ad874cce DG |
143 | DBG("Create a userspace trace for pid %d", opt_trace_pid); |
144 | ret = lttng_ust_create_trace(opt_trace_pid); | |
145 | if (ret < 0) { | |
146 | goto end; | |
147 | } | |
894be886 | 148 | MSG("Trace created successfully!"); |
ce3d728c | 149 | } |
ce3d728c | 150 | |
894be886 | 151 | if (auto_trace || opt_start_trace) { |
ad874cce DG |
152 | DBG("Start trace for pid %d", opt_trace_pid); |
153 | ret = lttng_ust_start_trace(opt_trace_pid); | |
154 | if (ret < 0) { | |
155 | goto end; | |
156 | } | |
157 | MSG("Trace started successfully!"); | |
158 | } else if (opt_stop_trace) { | |
159 | DBG("Stop trace for pid %d", opt_trace_pid); | |
160 | ret = lttng_ust_stop_trace(opt_trace_pid); | |
161 | if (ret < 0) { | |
162 | goto end; | |
163 | } | |
164 | MSG("Trace stopped successfully!"); | |
520ff687 | 165 | } |
ad874cce | 166 | |
520ff687 DG |
167 | } |
168 | ||
fac6795d DG |
169 | return 0; |
170 | ||
171 | end: | |
ebafd2a5 | 172 | ERR("%s", lttng_get_readable_code(ret)); |
5e16da05 | 173 | error: /* fall through */ |
7442b2ba DG |
174 | return ret; |
175 | } | |
176 | ||
177 | /* | |
894be886 | 178 | * process_kernel_create_trace |
96243366 | 179 | * |
894be886 | 180 | * Create a kernel trace. |
96243366 | 181 | */ |
894be886 | 182 | static int process_kernel_create_trace(void) |
96243366 | 183 | { |
20fe2104 DG |
184 | int ret; |
185 | ||
186 | /* Setup kernel session */ | |
187 | ret = lttng_kernel_create_session(); | |
188 | if (ret < 0) { | |
189 | goto error; | |
190 | } | |
191 | ||
192 | /* Create an empty channel (with no event) */ | |
193 | ret = lttng_kernel_create_channel(); | |
194 | if (ret < 0) { | |
195 | goto error; | |
196 | } | |
197 | ||
894be886 | 198 | return 0; |
20fe2104 DG |
199 | |
200 | error: | |
201 | return ret; | |
894be886 | 202 | } |
96243366 | 203 | |
894be886 DG |
204 | /* |
205 | * process_kernel_event | |
206 | * | |
207 | * Enable kernel event from the command line list given. | |
208 | */ | |
209 | static int process_opt_kernel_event(void) | |
210 | { | |
211 | int ret; | |
212 | char *event_name; | |
96243366 | 213 | |
894be886 DG |
214 | event_name = strtok(opt_event_list, ","); |
215 | while (event_name != NULL) { | |
216 | DBG("Enabling kernel event %s", event_name); | |
217 | ret = lttng_kernel_enable_event(event_name); | |
218 | if (ret < 0) { | |
219 | ERR("%s %s", lttng_get_readable_code(ret), event_name); | |
220 | } else { | |
221 | MSG("Kernel event %s enabled.", event_name); | |
96243366 | 222 | } |
894be886 DG |
223 | /* Next event */ |
224 | event_name = strtok(NULL, ","); | |
96243366 DG |
225 | } |
226 | ||
894be886 | 227 | return 0; |
96243366 DG |
228 | } |
229 | ||
230 | /* | |
894be886 | 231 | * set_opt_session_info |
96243366 | 232 | * |
894be886 DG |
233 | * Setup session_name, current_uuid, short_str_uuid and |
234 | * long_str_uuid using the command line options. | |
96243366 | 235 | */ |
894be886 | 236 | static void set_opt_session_info(void) |
96243366 | 237 | { |
894be886 DG |
238 | if (opt_session_name != NULL) { |
239 | session_name = strndup(opt_session_name, NAME_MAX); | |
240 | DBG("Session name set to %s", session_name); | |
241 | } | |
96243366 DG |
242 | } |
243 | ||
244 | /* | |
245 | * set_session_uuid | |
7442b2ba | 246 | * |
894be886 DG |
247 | * Set current session uuid to the current flow of command(s) using the |
248 | * session_name. | |
7442b2ba | 249 | */ |
96243366 | 250 | static int set_session_uuid(void) |
7442b2ba | 251 | { |
894be886 | 252 | int ret, count, i, found = 0; |
7442b2ba DG |
253 | struct lttng_session *sessions; |
254 | ||
96243366 DG |
255 | if (!uuid_is_null(current_uuid)) { |
256 | lttng_set_current_session_uuid(¤t_uuid); | |
257 | goto end; | |
258 | } | |
259 | ||
7442b2ba DG |
260 | count = lttng_list_sessions(&sessions); |
261 | if (count < 0) { | |
262 | ret = count; | |
263 | goto error; | |
264 | } | |
265 | ||
266 | for (i = 0; i < count; i++) { | |
894be886 | 267 | if (strncmp(sessions[i].name, session_name, NAME_MAX) == 0) { |
96243366 | 268 | lttng_set_current_session_uuid(&sessions[i].uuid); |
894be886 DG |
269 | uuid_copy(current_uuid, sessions[i].uuid); |
270 | found = 1; | |
7442b2ba DG |
271 | break; |
272 | } | |
273 | } | |
274 | ||
275 | free(sessions); | |
276 | ||
894be886 DG |
277 | if (!found) { |
278 | return -1; | |
279 | } | |
280 | ||
96243366 | 281 | end: |
894be886 | 282 | DBG("Session UUID set"); |
7442b2ba DG |
283 | return 0; |
284 | ||
285 | error: | |
286 | return ret; | |
fac6795d DG |
287 | } |
288 | ||
1657e9bb DG |
289 | /* |
290 | * process_opt_list_traces | |
291 | * | |
292 | * Get list of all traces for a specific session uuid. | |
293 | */ | |
294 | static int process_opt_list_traces(void) | |
295 | { | |
296 | int ret, i; | |
1657e9bb DG |
297 | struct lttng_trace *traces; |
298 | ||
96243366 | 299 | ret = lttng_list_traces(¤t_uuid, &traces); |
894be886 | 300 | DBG("Number of traces to list %d", ret); |
1657e9bb DG |
301 | if (ret < 0) { |
302 | goto error; | |
303 | } | |
304 | ||
894be886 DG |
305 | /* No traces */ |
306 | if (ret == 0) { | |
307 | MSG("No traces found."); | |
308 | goto error; | |
309 | } | |
310 | ||
1657e9bb DG |
311 | MSG("Userspace traces:"); |
312 | for (i = 0; i < ret; i++) { | |
313 | if (traces[i].type == USERSPACE) { | |
47b74d63 DG |
314 | MSG("\t%d) %s (pid: %d): %s", |
315 | i, traces[i].name, traces[i].pid, | |
316 | get_cmdline_by_pid(traces[i].pid)); | |
1657e9bb DG |
317 | } else { |
318 | break; | |
319 | } | |
320 | } | |
321 | ||
322 | MSG("Kernel traces:"); | |
323 | for (;i < ret; i++) { | |
324 | if (traces[i].type == KERNEL) { | |
325 | MSG("\t%d) %s", i, traces[i].name); | |
326 | } | |
327 | } | |
328 | ||
329 | free(traces); | |
330 | ||
331 | error: | |
332 | return ret; | |
333 | } | |
334 | ||
aaf97519 DG |
335 | /* |
336 | * process_opt_create_session | |
337 | * | |
338 | * Create a new session using the name pass | |
339 | * to the command line. | |
340 | */ | |
341 | static int process_opt_create_session(void) | |
342 | { | |
343 | int ret; | |
96243366 DG |
344 | char name[NAME_MAX]; |
345 | time_t rawtime; | |
346 | struct tm *timeinfo; | |
347 | ||
894be886 DG |
348 | /* Auto session name creation */ |
349 | if (opt_session_name == NULL) { | |
96243366 DG |
350 | time(&rawtime); |
351 | timeinfo = localtime(&rawtime); | |
894be886 | 352 | strftime(name, sizeof(name), "auto-%Y%m%d-%H%M%S", timeinfo); |
96243366 | 353 | session_name = strndup(name, sizeof(name)); |
894be886 | 354 | DBG("Auto session name set to %s", session_name); |
96243366 | 355 | } |
aaf97519 | 356 | |
894be886 | 357 | ret = lttng_create_session(session_name); |
aaf97519 DG |
358 | if (ret < 0) { |
359 | goto error; | |
360 | } | |
361 | ||
894be886 | 362 | MSG("Session created: %s", session_name); |
aaf97519 DG |
363 | |
364 | error: | |
365 | return ret; | |
366 | } | |
367 | ||
57167058 DG |
368 | /* |
369 | * process_opt_list_sessions | |
370 | * | |
371 | * Get the list of available sessions from | |
372 | * the session daemon and print it to user. | |
373 | */ | |
374 | static int process_opt_list_sessions(void) | |
375 | { | |
376 | int ret, count, i; | |
894be886 | 377 | struct lttng_session *sessions; |
57167058 | 378 | |
894be886 | 379 | count = lttng_list_sessions(&sessions); |
7442b2ba | 380 | DBG("Session count %d", count); |
57167058 DG |
381 | if (count < 0) { |
382 | ret = count; | |
383 | goto error; | |
384 | } | |
385 | ||
7442b2ba | 386 | MSG("Available sessions (UUIDs):"); |
57167058 | 387 | for (i = 0; i < count; i++) { |
894be886 | 388 | MSG(" %d) %s", i+1, sessions[i].name); |
57167058 DG |
389 | } |
390 | ||
894be886 | 391 | free(sessions); |
7442b2ba | 392 | MSG("\nTo select a session, use -s, --session UUID."); |
57167058 DG |
393 | |
394 | return 0; | |
395 | ||
396 | error: | |
397 | return ret; | |
398 | } | |
399 | ||
fac6795d DG |
400 | /* |
401 | * process_opt_list_apps | |
402 | * | |
403 | * Get the UST traceable pid list and print | |
404 | * them to the user. | |
405 | */ | |
406 | static int process_opt_list_apps(void) | |
407 | { | |
e8f07c63 | 408 | int i, ret, count; |
fac6795d | 409 | pid_t *pids; |
1c9f7941 | 410 | char *cmdline; |
fac6795d | 411 | |
e8f07c63 DG |
412 | count = lttng_ust_list_apps(&pids); |
413 | if (count < 0) { | |
414 | ret = count; | |
fac6795d DG |
415 | goto error; |
416 | } | |
417 | ||
418 | MSG("LTTng UST traceable application [name (pid)]:"); | |
e8f07c63 | 419 | for (i=0; i < count; i++) { |
47b74d63 DG |
420 | cmdline = get_cmdline_by_pid(pids[i]); |
421 | if (cmdline == NULL) { | |
e8f07c63 | 422 | MSG("\t(not running) (%d)", pids[i]); |
fac6795d DG |
423 | continue; |
424 | } | |
fac6795d | 425 | MSG("\t%s (%d)", cmdline, pids[i]); |
1c9f7941 | 426 | free(cmdline); |
fac6795d DG |
427 | } |
428 | ||
e065084a DG |
429 | /* Allocated by lttng_ust_list_apps() */ |
430 | free(pids); | |
431 | ||
fac6795d DG |
432 | return 0; |
433 | ||
434 | error: | |
435 | return ret; | |
436 | } | |
437 | ||
1c9f7941 DG |
438 | /* |
439 | * get_cmdline_by_pid | |
440 | * | |
47b74d63 | 441 | * Get command line from /proc for a specific pid. |
1c9f7941 | 442 | * |
47b74d63 DG |
443 | * On success, return an allocated string pointer pointing to |
444 | * the proc cmdline. | |
445 | * On error, return NULL. | |
1c9f7941 | 446 | */ |
47b74d63 | 447 | static char *get_cmdline_by_pid(pid_t pid) |
1c9f7941 DG |
448 | { |
449 | int ret; | |
450 | FILE *fp; | |
47b74d63 | 451 | char *cmdline = NULL; |
1c9f7941 DG |
452 | char path[24]; /* Can't go bigger than /proc/65535/cmdline */ |
453 | ||
454 | snprintf(path, sizeof(path), "/proc/%d/cmdline", pid); | |
455 | fp = fopen(path, "r"); | |
456 | if (fp == NULL) { | |
47b74d63 | 457 | goto end; |
1c9f7941 DG |
458 | } |
459 | ||
460 | /* Caller must free() *cmdline */ | |
47b74d63 DG |
461 | cmdline = malloc(PATH_MAX); |
462 | ret = fread(cmdline, 1, PATH_MAX, fp); | |
1c9f7941 DG |
463 | fclose(fp); |
464 | ||
47b74d63 DG |
465 | end: |
466 | return cmdline; | |
1c9f7941 DG |
467 | } |
468 | ||
8548ff30 DG |
469 | /* |
470 | * validate_options | |
471 | * | |
894be886 DG |
472 | * Make sure that all options passed to the command line are compatible with |
473 | * each others. | |
8548ff30 DG |
474 | * |
475 | * On error, return -1 | |
476 | * On success, return 0 | |
477 | */ | |
478 | static int validate_options(void) | |
479 | { | |
894be886 DG |
480 | /* If listing options, jump validation */ |
481 | if (opt_list_apps || opt_list_session) { | |
482 | goto end; | |
483 | } | |
ad874cce DG |
484 | /* Conflicting command */ |
485 | if (opt_start_trace && opt_stop_trace) { | |
486 | ERR("Can't use --start and --stop together."); | |
487 | goto error; | |
ad874cce | 488 | /* If no PID specified and trace_kernel is off */ |
894be886 DG |
489 | } else if ((opt_trace_pid == 0 && !opt_trace_kernel) && |
490 | (opt_create_trace || opt_start_trace || opt_stop_trace || opt_destroy_trace)) { | |
491 | ERR("Please specify for which tracer (-k or -p PID)."); | |
96243366 | 492 | goto error; |
894be886 DG |
493 | /* List traces, we need a session name */ |
494 | } else if (opt_list_traces && opt_session_name == NULL) { | |
96243366 DG |
495 | ERR("Can't use -t without -s, --session option."); |
496 | goto error; | |
894be886 DG |
497 | /* Can't set event for both kernel and userspace at the same time */ |
498 | } else if (opt_event_list != NULL && (opt_trace_kernel && opt_trace_pid)) { | |
499 | ERR("Please don't use --event for both kernel and userspace.\nOne at a time to enable events."); | |
500 | goto error; | |
501 | /* Don't need a trace name for kernel tracig */ | |
502 | } else if (opt_trace_name != NULL && opt_trace_kernel) { | |
503 | ERR("For action on a kernel trace, please don't specify a trace name."); | |
504 | goto error; | |
505 | } else if (opt_destroy_trace && opt_session_name == NULL) { | |
506 | ERR("Please specify a session in order to destroy a trace"); | |
507 | goto error; | |
508 | } else if (opt_create_trace || opt_destroy_trace) { | |
509 | /* Both kernel and user-space are denied for these options */ | |
510 | if (opt_trace_pid != 0 && opt_trace_kernel) { | |
511 | ERR("Kernel and user-space trace creation and destruction can't be used together."); | |
512 | goto error; | |
513 | /* Need a trace name for user-space tracing */ | |
514 | } else if (opt_trace_name == NULL && opt_trace_pid != 0) { | |
515 | ERR("Please specify a trace name for user-space tracing"); | |
516 | goto error; | |
517 | } | |
518 | } else if (opt_stop_trace && opt_trace_pid != 0 && opt_trace_name == NULL) { | |
519 | ERR("Please specify a trace name for user-space tracing"); | |
520 | goto error; | |
7442b2ba DG |
521 | } |
522 | ||
894be886 DG |
523 | /* If start trace, auto start tracing */ |
524 | if (opt_start_trace) { | |
525 | DBG("Requesting auto tracing"); | |
526 | auto_trace = 1; | |
527 | } | |
528 | ||
529 | /* If no session, auto create one */ | |
530 | if (opt_session_name == NULL) { | |
531 | DBG("Requesting an auto session creation"); | |
532 | auto_session = 1; | |
533 | } | |
534 | ||
535 | end: | |
8548ff30 DG |
536 | return 0; |
537 | ||
538 | error: | |
539 | return -1; | |
540 | } | |
541 | ||
5b8719f5 DG |
542 | /* |
543 | * spawn_sessiond | |
544 | * | |
545 | * Spawn a session daemon by forking and execv. | |
546 | */ | |
547 | static int spawn_sessiond(char *pathname) | |
548 | { | |
549 | int ret = 0; | |
550 | pid_t pid; | |
551 | ||
552 | MSG("Spawning session daemon"); | |
553 | pid = fork(); | |
554 | if (pid == 0) { | |
5e16da05 MD |
555 | /* |
556 | * Spawn session daemon and tell | |
5b8719f5 DG |
557 | * it to signal us when ready. |
558 | */ | |
5e16da05 MD |
559 | execlp(pathname, "ltt-sessiond", "--sig-parent", "--quiet", NULL); |
560 | /* execlp only returns if error happened */ | |
561 | if (errno == ENOENT) { | |
562 | ERR("No session daemon found. Use --sessiond-path."); | |
563 | } else { | |
564 | perror("execlp"); | |
5b8719f5 | 565 | } |
5e16da05 MD |
566 | kill(getppid(), SIGTERM); /* unpause parent */ |
567 | exit(EXIT_FAILURE); | |
5b8719f5 DG |
568 | } else if (pid > 0) { |
569 | /* Wait for ltt-sessiond to start */ | |
570 | pause(); | |
571 | goto end; | |
572 | } else { | |
573 | perror("fork"); | |
574 | ret = -1; | |
575 | goto end; | |
576 | } | |
577 | ||
578 | end: | |
579 | return ret; | |
580 | } | |
581 | ||
fac6795d DG |
582 | /* |
583 | * check_ltt_sessiond | |
584 | * | |
585 | * Check if the session daemon is available using | |
5b8719f5 DG |
586 | * the liblttngctl API for the check. If not, try to |
587 | * spawn a daemon. | |
fac6795d DG |
588 | */ |
589 | static int check_ltt_sessiond(void) | |
590 | { | |
591 | int ret; | |
5e16da05 | 592 | char *pathname = NULL, *alloc_pathname = NULL; |
fac6795d DG |
593 | |
594 | ret = lttng_check_session_daemon(); | |
595 | if (ret < 0) { | |
5b8719f5 DG |
596 | /* Try command line option path */ |
597 | if (opt_sessiond_path != NULL) { | |
598 | ret = access(opt_sessiond_path, F_OK | X_OK); | |
599 | if (ret < 0) { | |
600 | ERR("No such file: %s", opt_sessiond_path); | |
601 | goto end; | |
602 | } | |
603 | pathname = opt_sessiond_path; | |
604 | } else { | |
605 | /* Try LTTNG_SESSIOND_PATH env variable */ | |
e8f07c63 | 606 | pathname = getenv(LTTNG_SESSIOND_PATH_ENV); |
5b8719f5 DG |
607 | } |
608 | ||
609 | /* Let's rock and roll */ | |
610 | if (pathname == NULL) { | |
5e16da05 | 611 | ret = asprintf(&alloc_pathname, "ltt-sessiond"); |
5b8719f5 DG |
612 | if (ret < 0) { |
613 | goto end; | |
614 | } | |
5e16da05 | 615 | pathname = alloc_pathname; |
5b8719f5 DG |
616 | } |
617 | ||
618 | ret = spawn_sessiond(pathname); | |
5e16da05 | 619 | free(alloc_pathname); |
5b8719f5 DG |
620 | if (ret < 0) { |
621 | ERR("Problem occurs when starting %s", pathname); | |
622 | goto end; | |
623 | } | |
fac6795d DG |
624 | } |
625 | ||
5b8719f5 | 626 | end: |
fac6795d DG |
627 | return ret; |
628 | } | |
629 | ||
5b8719f5 DG |
630 | /* |
631 | * set_signal_handler | |
632 | * | |
633 | * Setup signal handler for SIGCHLD and SIGTERM. | |
634 | */ | |
635 | static int set_signal_handler(void) | |
636 | { | |
637 | int ret = 0; | |
638 | struct sigaction sa; | |
639 | sigset_t sigset; | |
640 | ||
641 | if ((ret = sigemptyset(&sigset)) < 0) { | |
642 | perror("sigemptyset"); | |
643 | goto end; | |
644 | } | |
645 | ||
646 | sa.sa_handler = sighandler; | |
647 | sa.sa_mask = sigset; | |
648 | sa.sa_flags = 0; | |
649 | if ((ret = sigaction(SIGCHLD, &sa, NULL)) < 0) { | |
650 | perror("sigaction"); | |
651 | goto end; | |
652 | } | |
fac6795d | 653 | |
5b8719f5 DG |
654 | if ((ret = sigaction(SIGTERM, &sa, NULL)) < 0) { |
655 | perror("sigaction"); | |
656 | goto end; | |
657 | } | |
658 | ||
659 | end: | |
660 | return ret; | |
661 | } | |
662 | ||
663 | /* | |
664 | * sighandler | |
665 | * | |
666 | * Signal handler for the daemon | |
667 | */ | |
668 | static void sighandler(int sig) | |
669 | { | |
5b8719f5 DG |
670 | switch (sig) { |
671 | case SIGTERM: | |
ce3d728c | 672 | DBG("SIGTERM catched"); |
5b8719f5 DG |
673 | clean_exit(EXIT_FAILURE); |
674 | break; | |
675 | case SIGCHLD: | |
676 | /* Notify is done */ | |
ce3d728c | 677 | DBG("SIGCHLD catched"); |
5b8719f5 DG |
678 | break; |
679 | default: | |
ce3d728c | 680 | DBG("Unknown signal %d catched", sig); |
5b8719f5 DG |
681 | break; |
682 | } | |
683 | ||
684 | return; | |
685 | } | |
7442b2ba | 686 | |
fac6795d DG |
687 | /* |
688 | * clean_exit | |
689 | */ | |
690 | void clean_exit(int code) | |
691 | { | |
692 | DBG("Clean exit"); | |
96243366 DG |
693 | if (session_name) { |
694 | free(session_name); | |
695 | } | |
696 | ||
fac6795d DG |
697 | exit(code); |
698 | } | |
699 | ||
700 | /* | |
5b8719f5 | 701 | * main |
fac6795d DG |
702 | */ |
703 | int main(int argc, char *argv[]) | |
704 | { | |
705 | int ret; | |
706 | ||
707 | progname = argv[0] ? argv[0] : "lttng"; | |
708 | ||
709 | /* For Mathieu Desnoyers aka Dr Tracing */ | |
710 | if (strncmp(progname, "drtrace", 7) == 0) { | |
711 | MSG("%c[%d;%dmWelcome back Dr Tracing!%c[%dm\n\n", 27,1,33,27,0); | |
712 | } | |
713 | ||
714 | ret = parse_args(argc, (const char **) argv); | |
715 | if (ret < 0) { | |
87378cf5 | 716 | clean_exit(EXIT_FAILURE); |
fac6795d DG |
717 | } |
718 | ||
8548ff30 DG |
719 | ret = validate_options(); |
720 | if (ret < 0) { | |
721 | return EXIT_FAILURE; | |
722 | } | |
723 | ||
5b8719f5 DG |
724 | ret = set_signal_handler(); |
725 | if (ret < 0) { | |
87378cf5 | 726 | clean_exit(ret); |
5b8719f5 DG |
727 | } |
728 | ||
fac6795d DG |
729 | if (opt_tracing_group != NULL) { |
730 | DBG("Set tracing group to '%s'", opt_tracing_group); | |
731 | lttng_set_tracing_group(opt_tracing_group); | |
732 | } | |
733 | ||
734 | /* If ask for kernel tracing, need root perms */ | |
735 | if (opt_trace_kernel) { | |
736 | DBG("Kernel tracing activated"); | |
737 | if (getuid() != 0) { | |
738 | ERR("%s must be setuid root", progname); | |
87378cf5 | 739 | clean_exit(-EPERM); |
fac6795d DG |
740 | } |
741 | } | |
742 | ||
743 | /* Check if the lttng session daemon is running. | |
744 | * If no, a daemon will be spawned. | |
745 | */ | |
5b8719f5 | 746 | if (opt_no_sessiond == 0 && (check_ltt_sessiond() < 0)) { |
87378cf5 | 747 | clean_exit(EXIT_FAILURE); |
fac6795d DG |
748 | } |
749 | ||
750 | ret = process_client_opt(); | |
751 | if (ret < 0) { | |
87378cf5 | 752 | clean_exit(ret); |
fac6795d DG |
753 | } |
754 | ||
87378cf5 DG |
755 | clean_exit(0); |
756 | ||
fac6795d DG |
757 | return 0; |
758 | } |