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); | |
8c0faa1d | 53 | static int process_kernel_start_trace(void); |
96243366 | 54 | static int set_session_uuid(void); |
5b8719f5 DG |
55 | static void sighandler(int sig); |
56 | static int set_signal_handler(void); | |
8548ff30 | 57 | static int validate_options(void); |
47b74d63 | 58 | static char *get_cmdline_by_pid(pid_t pid); |
96243366 | 59 | static void set_opt_session_info(void); |
fac6795d DG |
60 | |
61 | /* | |
62 | * start_client | |
63 | * | |
64 | * Process client request from the command line | |
65 | * options. Every tracing action is done by the | |
66 | * liblttngctl API. | |
67 | */ | |
68 | static int process_client_opt(void) | |
69 | { | |
70 | int ret; | |
96243366 DG |
71 | |
72 | set_opt_session_info(); | |
fac6795d | 73 | |
fac6795d DG |
74 | if (opt_list_apps) { |
75 | ret = process_opt_list_apps(); | |
76 | if (ret < 0) { | |
fac6795d DG |
77 | goto end; |
78 | } | |
894be886 | 79 | goto error; |
fac6795d DG |
80 | } |
81 | ||
57167058 DG |
82 | if (opt_list_session) { |
83 | ret = process_opt_list_sessions(); | |
84 | if (ret < 0) { | |
85 | goto end; | |
86 | } | |
894be886 | 87 | goto error; |
57167058 DG |
88 | } |
89 | ||
894be886 DG |
90 | /* Session creation or auto session set on */ |
91 | if (auto_session || opt_create_session) { | |
92 | DBG("Creating a new session"); | |
93 | ret = process_opt_create_session(); | |
1657e9bb DG |
94 | if (ret < 0) { |
95 | goto end; | |
96 | } | |
97 | } | |
98 | ||
894be886 DG |
99 | ret = set_session_uuid(); |
100 | if (ret < 0) { | |
101 | ERR("Session %s not found", opt_session_name); | |
102 | goto error; | |
103 | } | |
aaf97519 | 104 | |
894be886 DG |
105 | if (opt_destroy_session) { |
106 | ret = lttng_destroy_session(¤t_uuid); | |
8028d920 | 107 | if (ret < 0) { |
894be886 | 108 | goto end; |
8028d920 | 109 | } |
894be886 | 110 | MSG("Session %s destroyed.", opt_session_name); |
8028d920 DG |
111 | } |
112 | ||
96243366 DG |
113 | if (opt_list_traces) { |
114 | ret = process_opt_list_traces(); | |
7442b2ba | 115 | if (ret < 0) { |
96243366 | 116 | goto end; |
7442b2ba | 117 | } |
e8be5f4f DG |
118 | } |
119 | ||
96243366 DG |
120 | /* |
121 | * Action on traces (kernel or/and userspace). | |
122 | */ | |
894be886 | 123 | |
ad874cce | 124 | if (opt_trace_kernel) { |
894be886 DG |
125 | if (auto_trace || opt_create_trace) { |
126 | DBG("Creating a kernel trace"); | |
127 | ret = process_kernel_create_trace(); | |
128 | if (ret < 0) { | |
129 | goto end; | |
130 | } | |
131 | } | |
132 | ||
133 | if (opt_event_list != NULL) { | |
134 | ret = process_opt_kernel_event(); | |
f34daff7 DG |
135 | if (ret < 0) { |
136 | goto end; | |
137 | } | |
894be886 DG |
138 | } else { |
139 | // Enable all events | |
140 | } | |
8c0faa1d DG |
141 | |
142 | if (auto_trace || opt_start_trace) { | |
143 | DBG("Starting kernel tracing"); | |
144 | ret = process_kernel_start_trace(); | |
145 | if (ret < 0) { | |
146 | goto end; | |
147 | } | |
148 | } | |
149 | ||
150 | if (opt_stop_trace) { | |
151 | DBG("Stopping kernel tracing"); | |
152 | ret = lttng_kernel_stop_tracing(); | |
153 | if (ret < 0) { | |
154 | goto end; | |
155 | } | |
156 | } | |
df0da139 DG |
157 | } |
158 | ||
ad874cce | 159 | if (opt_trace_pid != 0) { |
894be886 | 160 | if (auto_trace || opt_create_trace) { |
ad874cce DG |
161 | DBG("Create a userspace trace for pid %d", opt_trace_pid); |
162 | ret = lttng_ust_create_trace(opt_trace_pid); | |
163 | if (ret < 0) { | |
164 | goto end; | |
165 | } | |
894be886 | 166 | MSG("Trace created successfully!"); |
ce3d728c | 167 | } |
ce3d728c | 168 | |
894be886 | 169 | if (auto_trace || opt_start_trace) { |
ad874cce DG |
170 | DBG("Start trace for pid %d", opt_trace_pid); |
171 | ret = lttng_ust_start_trace(opt_trace_pid); | |
172 | if (ret < 0) { | |
173 | goto end; | |
174 | } | |
175 | MSG("Trace started successfully!"); | |
176 | } else if (opt_stop_trace) { | |
177 | DBG("Stop trace for pid %d", opt_trace_pid); | |
178 | ret = lttng_ust_stop_trace(opt_trace_pid); | |
179 | if (ret < 0) { | |
180 | goto end; | |
181 | } | |
182 | MSG("Trace stopped successfully!"); | |
520ff687 | 183 | } |
ad874cce | 184 | |
520ff687 DG |
185 | } |
186 | ||
fac6795d DG |
187 | return 0; |
188 | ||
189 | end: | |
ebafd2a5 | 190 | ERR("%s", lttng_get_readable_code(ret)); |
5e16da05 | 191 | error: /* fall through */ |
7442b2ba DG |
192 | return ret; |
193 | } | |
194 | ||
8c0faa1d DG |
195 | /* |
196 | * process_kernel_start_trace | |
197 | * | |
198 | * Start a kernel trace. | |
199 | */ | |
200 | static int process_kernel_start_trace(void) | |
201 | { | |
202 | int ret; | |
203 | ||
204 | ret = lttng_kernel_create_stream(); | |
205 | if (ret < 0) { | |
206 | goto error; | |
207 | } | |
208 | ||
209 | ret = lttng_kernel_start_tracing(); | |
210 | if (ret < 0) { | |
211 | goto error; | |
212 | } | |
213 | ||
214 | MSG("Kernel tracing started"); | |
215 | ||
216 | return 0; | |
217 | ||
218 | error: | |
219 | return ret; | |
220 | } | |
221 | ||
7442b2ba | 222 | /* |
894be886 | 223 | * process_kernel_create_trace |
96243366 | 224 | * |
894be886 | 225 | * Create a kernel trace. |
96243366 | 226 | */ |
894be886 | 227 | static int process_kernel_create_trace(void) |
96243366 | 228 | { |
20fe2104 DG |
229 | int ret; |
230 | ||
231 | /* Setup kernel session */ | |
232 | ret = lttng_kernel_create_session(); | |
233 | if (ret < 0) { | |
234 | goto error; | |
235 | } | |
236 | ||
237 | /* Create an empty channel (with no event) */ | |
238 | ret = lttng_kernel_create_channel(); | |
239 | if (ret < 0) { | |
240 | goto error; | |
a5c5a2bd DG |
241 | } |
242 | ||
243 | /* Opening metadata for session */ | |
244 | ret = lttng_kernel_open_metadata(); | |
245 | if (ret < 0) { | |
246 | goto error; | |
20fe2104 DG |
247 | } |
248 | ||
894be886 | 249 | return 0; |
20fe2104 DG |
250 | |
251 | error: | |
252 | return ret; | |
894be886 | 253 | } |
96243366 | 254 | |
894be886 DG |
255 | /* |
256 | * process_kernel_event | |
257 | * | |
258 | * Enable kernel event from the command line list given. | |
259 | */ | |
260 | static int process_opt_kernel_event(void) | |
261 | { | |
262 | int ret; | |
263 | char *event_name; | |
96243366 | 264 | |
894be886 DG |
265 | event_name = strtok(opt_event_list, ","); |
266 | while (event_name != NULL) { | |
267 | DBG("Enabling kernel event %s", event_name); | |
268 | ret = lttng_kernel_enable_event(event_name); | |
269 | if (ret < 0) { | |
270 | ERR("%s %s", lttng_get_readable_code(ret), event_name); | |
271 | } else { | |
272 | MSG("Kernel event %s enabled.", event_name); | |
96243366 | 273 | } |
894be886 DG |
274 | /* Next event */ |
275 | event_name = strtok(NULL, ","); | |
96243366 DG |
276 | } |
277 | ||
894be886 | 278 | return 0; |
96243366 DG |
279 | } |
280 | ||
281 | /* | |
894be886 | 282 | * set_opt_session_info |
96243366 | 283 | * |
894be886 DG |
284 | * Setup session_name, current_uuid, short_str_uuid and |
285 | * long_str_uuid using the command line options. | |
96243366 | 286 | */ |
894be886 | 287 | static void set_opt_session_info(void) |
96243366 | 288 | { |
894be886 DG |
289 | if (opt_session_name != NULL) { |
290 | session_name = strndup(opt_session_name, NAME_MAX); | |
291 | DBG("Session name set to %s", session_name); | |
292 | } | |
96243366 DG |
293 | } |
294 | ||
295 | /* | |
296 | * set_session_uuid | |
7442b2ba | 297 | * |
894be886 DG |
298 | * Set current session uuid to the current flow of command(s) using the |
299 | * session_name. | |
7442b2ba | 300 | */ |
96243366 | 301 | static int set_session_uuid(void) |
7442b2ba | 302 | { |
894be886 | 303 | int ret, count, i, found = 0; |
7442b2ba DG |
304 | struct lttng_session *sessions; |
305 | ||
96243366 DG |
306 | if (!uuid_is_null(current_uuid)) { |
307 | lttng_set_current_session_uuid(¤t_uuid); | |
308 | goto end; | |
309 | } | |
310 | ||
7442b2ba DG |
311 | count = lttng_list_sessions(&sessions); |
312 | if (count < 0) { | |
313 | ret = count; | |
314 | goto error; | |
315 | } | |
316 | ||
317 | for (i = 0; i < count; i++) { | |
894be886 | 318 | if (strncmp(sessions[i].name, session_name, NAME_MAX) == 0) { |
96243366 | 319 | lttng_set_current_session_uuid(&sessions[i].uuid); |
894be886 DG |
320 | uuid_copy(current_uuid, sessions[i].uuid); |
321 | found = 1; | |
7442b2ba DG |
322 | break; |
323 | } | |
324 | } | |
325 | ||
326 | free(sessions); | |
327 | ||
894be886 DG |
328 | if (!found) { |
329 | return -1; | |
330 | } | |
331 | ||
96243366 | 332 | end: |
894be886 | 333 | DBG("Session UUID set"); |
7442b2ba DG |
334 | return 0; |
335 | ||
336 | error: | |
337 | return ret; | |
fac6795d DG |
338 | } |
339 | ||
1657e9bb DG |
340 | /* |
341 | * process_opt_list_traces | |
342 | * | |
343 | * Get list of all traces for a specific session uuid. | |
344 | */ | |
345 | static int process_opt_list_traces(void) | |
346 | { | |
347 | int ret, i; | |
1657e9bb DG |
348 | struct lttng_trace *traces; |
349 | ||
96243366 | 350 | ret = lttng_list_traces(¤t_uuid, &traces); |
894be886 | 351 | DBG("Number of traces to list %d", ret); |
1657e9bb DG |
352 | if (ret < 0) { |
353 | goto error; | |
354 | } | |
355 | ||
894be886 DG |
356 | /* No traces */ |
357 | if (ret == 0) { | |
358 | MSG("No traces found."); | |
359 | goto error; | |
360 | } | |
361 | ||
1657e9bb DG |
362 | MSG("Userspace traces:"); |
363 | for (i = 0; i < ret; i++) { | |
364 | if (traces[i].type == USERSPACE) { | |
47b74d63 DG |
365 | MSG("\t%d) %s (pid: %d): %s", |
366 | i, traces[i].name, traces[i].pid, | |
367 | get_cmdline_by_pid(traces[i].pid)); | |
1657e9bb DG |
368 | } else { |
369 | break; | |
370 | } | |
371 | } | |
372 | ||
373 | MSG("Kernel traces:"); | |
374 | for (;i < ret; i++) { | |
375 | if (traces[i].type == KERNEL) { | |
376 | MSG("\t%d) %s", i, traces[i].name); | |
377 | } | |
378 | } | |
379 | ||
380 | free(traces); | |
381 | ||
382 | error: | |
383 | return ret; | |
384 | } | |
385 | ||
aaf97519 DG |
386 | /* |
387 | * process_opt_create_session | |
388 | * | |
389 | * Create a new session using the name pass | |
390 | * to the command line. | |
391 | */ | |
392 | static int process_opt_create_session(void) | |
393 | { | |
394 | int ret; | |
96243366 DG |
395 | char name[NAME_MAX]; |
396 | time_t rawtime; | |
397 | struct tm *timeinfo; | |
398 | ||
894be886 DG |
399 | /* Auto session name creation */ |
400 | if (opt_session_name == NULL) { | |
96243366 DG |
401 | time(&rawtime); |
402 | timeinfo = localtime(&rawtime); | |
894be886 | 403 | strftime(name, sizeof(name), "auto-%Y%m%d-%H%M%S", timeinfo); |
96243366 | 404 | session_name = strndup(name, sizeof(name)); |
894be886 | 405 | DBG("Auto session name set to %s", session_name); |
96243366 | 406 | } |
aaf97519 | 407 | |
894be886 | 408 | ret = lttng_create_session(session_name); |
aaf97519 DG |
409 | if (ret < 0) { |
410 | goto error; | |
411 | } | |
412 | ||
894be886 | 413 | MSG("Session created: %s", session_name); |
aaf97519 DG |
414 | |
415 | error: | |
416 | return ret; | |
417 | } | |
418 | ||
57167058 DG |
419 | /* |
420 | * process_opt_list_sessions | |
421 | * | |
422 | * Get the list of available sessions from | |
423 | * the session daemon and print it to user. | |
424 | */ | |
425 | static int process_opt_list_sessions(void) | |
426 | { | |
427 | int ret, count, i; | |
894be886 | 428 | struct lttng_session *sessions; |
57167058 | 429 | |
894be886 | 430 | count = lttng_list_sessions(&sessions); |
7442b2ba | 431 | DBG("Session count %d", count); |
57167058 DG |
432 | if (count < 0) { |
433 | ret = count; | |
434 | goto error; | |
435 | } | |
436 | ||
7442b2ba | 437 | MSG("Available sessions (UUIDs):"); |
57167058 | 438 | for (i = 0; i < count; i++) { |
894be886 | 439 | MSG(" %d) %s", i+1, sessions[i].name); |
57167058 DG |
440 | } |
441 | ||
894be886 | 442 | free(sessions); |
7442b2ba | 443 | MSG("\nTo select a session, use -s, --session UUID."); |
57167058 DG |
444 | |
445 | return 0; | |
446 | ||
447 | error: | |
448 | return ret; | |
449 | } | |
450 | ||
fac6795d DG |
451 | /* |
452 | * process_opt_list_apps | |
453 | * | |
454 | * Get the UST traceable pid list and print | |
455 | * them to the user. | |
456 | */ | |
457 | static int process_opt_list_apps(void) | |
458 | { | |
e8f07c63 | 459 | int i, ret, count; |
fac6795d | 460 | pid_t *pids; |
1c9f7941 | 461 | char *cmdline; |
fac6795d | 462 | |
e8f07c63 DG |
463 | count = lttng_ust_list_apps(&pids); |
464 | if (count < 0) { | |
465 | ret = count; | |
fac6795d DG |
466 | goto error; |
467 | } | |
468 | ||
469 | MSG("LTTng UST traceable application [name (pid)]:"); | |
e8f07c63 | 470 | for (i=0; i < count; i++) { |
47b74d63 DG |
471 | cmdline = get_cmdline_by_pid(pids[i]); |
472 | if (cmdline == NULL) { | |
e8f07c63 | 473 | MSG("\t(not running) (%d)", pids[i]); |
fac6795d DG |
474 | continue; |
475 | } | |
fac6795d | 476 | MSG("\t%s (%d)", cmdline, pids[i]); |
1c9f7941 | 477 | free(cmdline); |
fac6795d DG |
478 | } |
479 | ||
e065084a DG |
480 | /* Allocated by lttng_ust_list_apps() */ |
481 | free(pids); | |
482 | ||
fac6795d DG |
483 | return 0; |
484 | ||
485 | error: | |
486 | return ret; | |
487 | } | |
488 | ||
1c9f7941 DG |
489 | /* |
490 | * get_cmdline_by_pid | |
491 | * | |
47b74d63 | 492 | * Get command line from /proc for a specific pid. |
1c9f7941 | 493 | * |
47b74d63 DG |
494 | * On success, return an allocated string pointer pointing to |
495 | * the proc cmdline. | |
496 | * On error, return NULL. | |
1c9f7941 | 497 | */ |
47b74d63 | 498 | static char *get_cmdline_by_pid(pid_t pid) |
1c9f7941 DG |
499 | { |
500 | int ret; | |
501 | FILE *fp; | |
47b74d63 | 502 | char *cmdline = NULL; |
1c9f7941 DG |
503 | char path[24]; /* Can't go bigger than /proc/65535/cmdline */ |
504 | ||
505 | snprintf(path, sizeof(path), "/proc/%d/cmdline", pid); | |
506 | fp = fopen(path, "r"); | |
507 | if (fp == NULL) { | |
47b74d63 | 508 | goto end; |
1c9f7941 DG |
509 | } |
510 | ||
511 | /* Caller must free() *cmdline */ | |
47b74d63 DG |
512 | cmdline = malloc(PATH_MAX); |
513 | ret = fread(cmdline, 1, PATH_MAX, fp); | |
1c9f7941 DG |
514 | fclose(fp); |
515 | ||
47b74d63 DG |
516 | end: |
517 | return cmdline; | |
1c9f7941 DG |
518 | } |
519 | ||
8548ff30 DG |
520 | /* |
521 | * validate_options | |
522 | * | |
894be886 DG |
523 | * Make sure that all options passed to the command line are compatible with |
524 | * each others. | |
8548ff30 DG |
525 | * |
526 | * On error, return -1 | |
527 | * On success, return 0 | |
528 | */ | |
529 | static int validate_options(void) | |
530 | { | |
894be886 DG |
531 | /* If listing options, jump validation */ |
532 | if (opt_list_apps || opt_list_session) { | |
533 | goto end; | |
534 | } | |
ad874cce DG |
535 | /* Conflicting command */ |
536 | if (opt_start_trace && opt_stop_trace) { | |
537 | ERR("Can't use --start and --stop together."); | |
538 | goto error; | |
ad874cce | 539 | /* If no PID specified and trace_kernel is off */ |
894be886 DG |
540 | } else if ((opt_trace_pid == 0 && !opt_trace_kernel) && |
541 | (opt_create_trace || opt_start_trace || opt_stop_trace || opt_destroy_trace)) { | |
542 | ERR("Please specify for which tracer (-k or -p PID)."); | |
96243366 | 543 | goto error; |
894be886 DG |
544 | /* List traces, we need a session name */ |
545 | } else if (opt_list_traces && opt_session_name == NULL) { | |
96243366 DG |
546 | ERR("Can't use -t without -s, --session option."); |
547 | goto error; | |
894be886 DG |
548 | /* Can't set event for both kernel and userspace at the same time */ |
549 | } else if (opt_event_list != NULL && (opt_trace_kernel && opt_trace_pid)) { | |
550 | ERR("Please don't use --event for both kernel and userspace.\nOne at a time to enable events."); | |
551 | goto error; | |
552 | /* Don't need a trace name for kernel tracig */ | |
553 | } else if (opt_trace_name != NULL && opt_trace_kernel) { | |
554 | ERR("For action on a kernel trace, please don't specify a trace name."); | |
555 | goto error; | |
556 | } else if (opt_destroy_trace && opt_session_name == NULL) { | |
557 | ERR("Please specify a session in order to destroy a trace"); | |
558 | goto error; | |
559 | } else if (opt_create_trace || opt_destroy_trace) { | |
560 | /* Both kernel and user-space are denied for these options */ | |
561 | if (opt_trace_pid != 0 && opt_trace_kernel) { | |
562 | ERR("Kernel and user-space trace creation and destruction can't be used together."); | |
563 | goto error; | |
564 | /* Need a trace name for user-space tracing */ | |
565 | } else if (opt_trace_name == NULL && opt_trace_pid != 0) { | |
566 | ERR("Please specify a trace name for user-space tracing"); | |
567 | goto error; | |
568 | } | |
569 | } else if (opt_stop_trace && opt_trace_pid != 0 && opt_trace_name == NULL) { | |
570 | ERR("Please specify a trace name for user-space tracing"); | |
571 | goto error; | |
6d8076ad DG |
572 | } else if (opt_stop_trace && opt_session_name == NULL) { |
573 | ERR("Please specify a session to stop tracing"); | |
574 | goto error; | |
7442b2ba DG |
575 | } |
576 | ||
894be886 | 577 | /* If start trace, auto start tracing */ |
f34daff7 | 578 | if (opt_start_trace || opt_event_list != NULL) { |
894be886 DG |
579 | DBG("Requesting auto tracing"); |
580 | auto_trace = 1; | |
581 | } | |
582 | ||
583 | /* If no session, auto create one */ | |
584 | if (opt_session_name == NULL) { | |
585 | DBG("Requesting an auto session creation"); | |
586 | auto_session = 1; | |
587 | } | |
588 | ||
589 | end: | |
8548ff30 DG |
590 | return 0; |
591 | ||
592 | error: | |
593 | return -1; | |
594 | } | |
595 | ||
5b8719f5 DG |
596 | /* |
597 | * spawn_sessiond | |
598 | * | |
599 | * Spawn a session daemon by forking and execv. | |
600 | */ | |
601 | static int spawn_sessiond(char *pathname) | |
602 | { | |
603 | int ret = 0; | |
604 | pid_t pid; | |
605 | ||
606 | MSG("Spawning session daemon"); | |
607 | pid = fork(); | |
608 | if (pid == 0) { | |
5e16da05 MD |
609 | /* |
610 | * Spawn session daemon and tell | |
5b8719f5 DG |
611 | * it to signal us when ready. |
612 | */ | |
5e16da05 MD |
613 | execlp(pathname, "ltt-sessiond", "--sig-parent", "--quiet", NULL); |
614 | /* execlp only returns if error happened */ | |
615 | if (errno == ENOENT) { | |
616 | ERR("No session daemon found. Use --sessiond-path."); | |
617 | } else { | |
618 | perror("execlp"); | |
5b8719f5 | 619 | } |
5e16da05 MD |
620 | kill(getppid(), SIGTERM); /* unpause parent */ |
621 | exit(EXIT_FAILURE); | |
5b8719f5 DG |
622 | } else if (pid > 0) { |
623 | /* Wait for ltt-sessiond to start */ | |
624 | pause(); | |
625 | goto end; | |
626 | } else { | |
627 | perror("fork"); | |
628 | ret = -1; | |
629 | goto end; | |
630 | } | |
631 | ||
632 | end: | |
633 | return ret; | |
634 | } | |
635 | ||
fac6795d DG |
636 | /* |
637 | * check_ltt_sessiond | |
638 | * | |
639 | * Check if the session daemon is available using | |
5b8719f5 DG |
640 | * the liblttngctl API for the check. If not, try to |
641 | * spawn a daemon. | |
fac6795d DG |
642 | */ |
643 | static int check_ltt_sessiond(void) | |
644 | { | |
645 | int ret; | |
5e16da05 | 646 | char *pathname = NULL, *alloc_pathname = NULL; |
fac6795d DG |
647 | |
648 | ret = lttng_check_session_daemon(); | |
649 | if (ret < 0) { | |
5b8719f5 DG |
650 | /* Try command line option path */ |
651 | if (opt_sessiond_path != NULL) { | |
652 | ret = access(opt_sessiond_path, F_OK | X_OK); | |
653 | if (ret < 0) { | |
654 | ERR("No such file: %s", opt_sessiond_path); | |
655 | goto end; | |
656 | } | |
657 | pathname = opt_sessiond_path; | |
658 | } else { | |
659 | /* Try LTTNG_SESSIOND_PATH env variable */ | |
e8f07c63 | 660 | pathname = getenv(LTTNG_SESSIOND_PATH_ENV); |
5b8719f5 DG |
661 | } |
662 | ||
663 | /* Let's rock and roll */ | |
664 | if (pathname == NULL) { | |
5e16da05 | 665 | ret = asprintf(&alloc_pathname, "ltt-sessiond"); |
5b8719f5 DG |
666 | if (ret < 0) { |
667 | goto end; | |
668 | } | |
5e16da05 | 669 | pathname = alloc_pathname; |
5b8719f5 DG |
670 | } |
671 | ||
672 | ret = spawn_sessiond(pathname); | |
5e16da05 | 673 | free(alloc_pathname); |
5b8719f5 DG |
674 | if (ret < 0) { |
675 | ERR("Problem occurs when starting %s", pathname); | |
676 | goto end; | |
677 | } | |
fac6795d DG |
678 | } |
679 | ||
5b8719f5 | 680 | end: |
fac6795d DG |
681 | return ret; |
682 | } | |
683 | ||
5b8719f5 DG |
684 | /* |
685 | * set_signal_handler | |
686 | * | |
687 | * Setup signal handler for SIGCHLD and SIGTERM. | |
688 | */ | |
689 | static int set_signal_handler(void) | |
690 | { | |
691 | int ret = 0; | |
692 | struct sigaction sa; | |
693 | sigset_t sigset; | |
694 | ||
695 | if ((ret = sigemptyset(&sigset)) < 0) { | |
696 | perror("sigemptyset"); | |
697 | goto end; | |
698 | } | |
699 | ||
700 | sa.sa_handler = sighandler; | |
701 | sa.sa_mask = sigset; | |
702 | sa.sa_flags = 0; | |
703 | if ((ret = sigaction(SIGCHLD, &sa, NULL)) < 0) { | |
704 | perror("sigaction"); | |
705 | goto end; | |
706 | } | |
fac6795d | 707 | |
5b8719f5 DG |
708 | if ((ret = sigaction(SIGTERM, &sa, NULL)) < 0) { |
709 | perror("sigaction"); | |
710 | goto end; | |
711 | } | |
712 | ||
713 | end: | |
714 | return ret; | |
715 | } | |
716 | ||
717 | /* | |
718 | * sighandler | |
719 | * | |
720 | * Signal handler for the daemon | |
721 | */ | |
722 | static void sighandler(int sig) | |
723 | { | |
5b8719f5 DG |
724 | switch (sig) { |
725 | case SIGTERM: | |
ce3d728c | 726 | DBG("SIGTERM catched"); |
5b8719f5 DG |
727 | clean_exit(EXIT_FAILURE); |
728 | break; | |
729 | case SIGCHLD: | |
730 | /* Notify is done */ | |
ce3d728c | 731 | DBG("SIGCHLD catched"); |
5b8719f5 DG |
732 | break; |
733 | default: | |
ce3d728c | 734 | DBG("Unknown signal %d catched", sig); |
5b8719f5 DG |
735 | break; |
736 | } | |
737 | ||
738 | return; | |
739 | } | |
7442b2ba | 740 | |
fac6795d DG |
741 | /* |
742 | * clean_exit | |
743 | */ | |
744 | void clean_exit(int code) | |
745 | { | |
746 | DBG("Clean exit"); | |
96243366 DG |
747 | if (session_name) { |
748 | free(session_name); | |
749 | } | |
750 | ||
fac6795d DG |
751 | exit(code); |
752 | } | |
753 | ||
754 | /* | |
5b8719f5 | 755 | * main |
fac6795d DG |
756 | */ |
757 | int main(int argc, char *argv[]) | |
758 | { | |
759 | int ret; | |
760 | ||
761 | progname = argv[0] ? argv[0] : "lttng"; | |
762 | ||
763 | /* For Mathieu Desnoyers aka Dr Tracing */ | |
764 | if (strncmp(progname, "drtrace", 7) == 0) { | |
765 | MSG("%c[%d;%dmWelcome back Dr Tracing!%c[%dm\n\n", 27,1,33,27,0); | |
766 | } | |
767 | ||
768 | ret = parse_args(argc, (const char **) argv); | |
769 | if (ret < 0) { | |
87378cf5 | 770 | clean_exit(EXIT_FAILURE); |
fac6795d DG |
771 | } |
772 | ||
8548ff30 DG |
773 | ret = validate_options(); |
774 | if (ret < 0) { | |
775 | return EXIT_FAILURE; | |
776 | } | |
777 | ||
5b8719f5 DG |
778 | ret = set_signal_handler(); |
779 | if (ret < 0) { | |
87378cf5 | 780 | clean_exit(ret); |
5b8719f5 DG |
781 | } |
782 | ||
fac6795d DG |
783 | if (opt_tracing_group != NULL) { |
784 | DBG("Set tracing group to '%s'", opt_tracing_group); | |
785 | lttng_set_tracing_group(opt_tracing_group); | |
786 | } | |
787 | ||
788 | /* If ask for kernel tracing, need root perms */ | |
789 | if (opt_trace_kernel) { | |
790 | DBG("Kernel tracing activated"); | |
791 | if (getuid() != 0) { | |
792 | ERR("%s must be setuid root", progname); | |
87378cf5 | 793 | clean_exit(-EPERM); |
fac6795d DG |
794 | } |
795 | } | |
796 | ||
797 | /* Check if the lttng session daemon is running. | |
798 | * If no, a daemon will be spawned. | |
799 | */ | |
5b8719f5 | 800 | if (opt_no_sessiond == 0 && (check_ltt_sessiond() < 0)) { |
87378cf5 | 801 | clean_exit(EXIT_FAILURE); |
fac6795d DG |
802 | } |
803 | ||
804 | ret = process_client_opt(); | |
805 | if (ret < 0) { | |
87378cf5 | 806 | clean_exit(ret); |
fac6795d DG |
807 | } |
808 | ||
87378cf5 DG |
809 | clean_exit(0); |
810 | ||
fac6795d DG |
811 | return 0; |
812 | } |