Commit | Line | Data |
---|---|---|
826d496d MD |
1 | /* |
2 | * Copyright (C) 2011 - David Goulet <david.goulet@polymtl.ca> | |
0fdd1e2c | 3 | * Mathieu Desnoyers <mathieu.desnoyers@efficios.com> |
fac6795d | 4 | * |
d14d33bf AM |
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. | |
91d76f53 | 8 | * |
d14d33bf AM |
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. | |
91d76f53 | 13 | * |
d14d33bf AM |
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 DG |
20 | #include <getopt.h> |
21 | #include <grp.h> | |
22 | #include <limits.h> | |
23 | #include <pthread.h> | |
8c0faa1d | 24 | #include <semaphore.h> |
fac6795d DG |
25 | #include <signal.h> |
26 | #include <stdio.h> | |
27 | #include <stdlib.h> | |
28 | #include <string.h> | |
0fdd1e2c | 29 | #include <sys/mman.h> |
b73401da | 30 | #include <sys/mount.h> |
1e307fab | 31 | #include <sys/resource.h> |
fac6795d DG |
32 | #include <sys/socket.h> |
33 | #include <sys/stat.h> | |
34 | #include <sys/types.h> | |
0fdd1e2c DG |
35 | #include <sys/wait.h> |
36 | #include <urcu/futex.h> | |
fac6795d | 37 | #include <unistd.h> |
3bd1e081 | 38 | #include <config.h> |
fac6795d | 39 | |
990570ed | 40 | #include <common/common.h> |
0ba98ebc | 41 | #include <common/compat/poll.h> |
d27c42b8 | 42 | #include <common/compat/socket.h> |
db758600 DG |
43 | #include <common/defaults.h> |
44 | #include <common/kernel-consumer/kernel-consumer.h> | |
45 | #include <common/ust-consumer/ust-consumer.h> | |
fac6795d | 46 | |
10a8a223 | 47 | #include "lttng-sessiond.h" |
54d01ffb | 48 | #include "channel.h" |
099e26bd | 49 | #include "context.h" |
54d01ffb | 50 | #include "event.h" |
099e26bd | 51 | #include "futex.h" |
4771f025 | 52 | #include "kernel.h" |
096102bd | 53 | #include "modprobe.h" |
0fdd1e2c | 54 | #include "shm.h" |
1e307fab | 55 | #include "ust-ctl.h" |
8e68d1c8 | 56 | #include "utils.h" |
4063050c | 57 | #include "fd-limit.h" |
fac6795d | 58 | |
ebaeda94 MD |
59 | #define CONSUMERD_FILE "lttng-consumerd" |
60 | ||
3bd1e081 MD |
61 | struct consumer_data { |
62 | enum lttng_consumer_type type; | |
63 | ||
64 | pthread_t thread; /* Worker thread interacting with the consumer */ | |
65 | sem_t sem; | |
66 | ||
67 | /* Mutex to control consumerd pid assignation */ | |
68 | pthread_mutex_t pid_mutex; | |
69 | pid_t pid; | |
70 | ||
71 | int err_sock; | |
72 | int cmd_sock; | |
73 | ||
74 | /* consumer error and command Unix socket path */ | |
75 | char err_unix_sock_path[PATH_MAX]; | |
76 | char cmd_unix_sock_path[PATH_MAX]; | |
77 | }; | |
78 | ||
75462a81 | 79 | /* Const values */ |
686204ab | 80 | const char default_home_dir[] = DEFAULT_HOME_DIR; |
bbccc3d2 | 81 | const char default_tracing_group[] = DEFAULT_TRACING_GROUP; |
686204ab MD |
82 | const char default_ust_sock_dir[] = DEFAULT_UST_SOCK_DIR; |
83 | const char default_global_apps_pipe[] = DEFAULT_GLOBAL_APPS_PIPE; | |
84 | ||
fac6795d DG |
85 | const char *progname; |
86 | const char *opt_tracing_group; | |
5b8719f5 | 87 | static int opt_sig_parent; |
97e19046 | 88 | static int opt_verbose_consumer; |
fac6795d | 89 | static int opt_daemon; |
4fba7219 | 90 | static int opt_no_kernel; |
fac6795d | 91 | static int is_root; /* Set to 1 if the daemon is running as root */ |
1d4b027a | 92 | static pid_t ppid; /* Parent PID for --sig-parent option */ |
67e40797 | 93 | static char *rundir; |
3bd1e081 MD |
94 | |
95 | /* Consumer daemon specific control data */ | |
96 | static struct consumer_data kconsumer_data = { | |
97 | .type = LTTNG_CONSUMER_KERNEL, | |
60922cb0 DG |
98 | .err_unix_sock_path = DEFAULT_KCONSUMERD_ERR_SOCK_PATH, |
99 | .cmd_unix_sock_path = DEFAULT_KCONSUMERD_CMD_SOCK_PATH, | |
03550b58 MD |
100 | .err_sock = -1, |
101 | .cmd_sock = -1, | |
3bd1e081 | 102 | }; |
7753dea8 MD |
103 | static struct consumer_data ustconsumer64_data = { |
104 | .type = LTTNG_CONSUMER64_UST, | |
60922cb0 DG |
105 | .err_unix_sock_path = DEFAULT_USTCONSUMERD64_ERR_SOCK_PATH, |
106 | .cmd_unix_sock_path = DEFAULT_USTCONSUMERD64_CMD_SOCK_PATH, | |
03550b58 MD |
107 | .err_sock = -1, |
108 | .cmd_sock = -1, | |
7753dea8 MD |
109 | }; |
110 | static struct consumer_data ustconsumer32_data = { | |
111 | .type = LTTNG_CONSUMER32_UST, | |
60922cb0 DG |
112 | .err_unix_sock_path = DEFAULT_USTCONSUMERD32_ERR_SOCK_PATH, |
113 | .cmd_unix_sock_path = DEFAULT_USTCONSUMERD32_CMD_SOCK_PATH, | |
03550b58 MD |
114 | .err_sock = -1, |
115 | .cmd_sock = -1, | |
3bd1e081 MD |
116 | }; |
117 | ||
099e26bd | 118 | static int dispatch_thread_exit; |
fac6795d | 119 | |
54d01ffb DG |
120 | /* Global application Unix socket path */ |
121 | static char apps_unix_sock_path[PATH_MAX]; | |
122 | /* Global client Unix socket path */ | |
123 | static char client_unix_sock_path[PATH_MAX]; | |
54d01ffb DG |
124 | /* global wait shm path for UST */ |
125 | static char wait_shm_path[PATH_MAX]; | |
fac6795d | 126 | |
1d4b027a | 127 | /* Sockets and FDs */ |
a4b35e07 MD |
128 | static int client_sock = -1; |
129 | static int apps_sock = -1; | |
130 | static int kernel_tracer_fd = -1; | |
76d7553f | 131 | static int kernel_poll_pipe[2] = { -1, -1 }; |
1d4b027a | 132 | |
273ea72c DG |
133 | /* |
134 | * Quit pipe for all threads. This permits a single cancellation point | |
135 | * for all threads when receiving an event on the pipe. | |
136 | */ | |
76d7553f | 137 | static int thread_quit_pipe[2] = { -1, -1 }; |
273ea72c | 138 | |
099e26bd DG |
139 | /* |
140 | * This pipe is used to inform the thread managing application communication | |
141 | * that a command is queued and ready to be processed. | |
142 | */ | |
76d7553f | 143 | static int apps_cmd_pipe[2] = { -1, -1 }; |
099e26bd | 144 | |
1d4b027a | 145 | /* Pthread, Mutexes and Semaphores */ |
1d4b027a | 146 | static pthread_t apps_thread; |
099e26bd | 147 | static pthread_t reg_apps_thread; |
1d4b027a | 148 | static pthread_t client_thread; |
7a485870 | 149 | static pthread_t kernel_thread; |
099e26bd | 150 | static pthread_t dispatch_thread; |
5eb91c98 | 151 | |
fac6795d | 152 | |
099e26bd DG |
153 | /* |
154 | * UST registration command queue. This queue is tied with a futex and uses a N | |
155 | * wakers / 1 waiter implemented and detailed in futex.c/.h | |
156 | * | |
157 | * The thread_manage_apps and thread_dispatch_ust_registration interact with | |
158 | * this queue and the wait/wake scheme. | |
159 | */ | |
160 | static struct ust_cmd_queue ust_cmd_queue; | |
161 | ||
b5541356 DG |
162 | /* |
163 | * Pointer initialized before thread creation. | |
164 | * | |
165 | * This points to the tracing session list containing the session count and a | |
166 | * mutex lock. The lock MUST be taken if you iterate over the list. The lock | |
167 | * MUST NOT be taken if you call a public function in session.c. | |
04ea676f | 168 | * |
d063d709 | 169 | * The lock is nested inside the structure: session_list_ptr->lock. Please use |
54d01ffb | 170 | * session_lock_list and session_unlock_list for lock acquisition. |
b5541356 DG |
171 | */ |
172 | static struct ltt_session_list *session_list_ptr; | |
173 | ||
7753dea8 MD |
174 | int ust_consumerd64_fd = -1; |
175 | int ust_consumerd32_fd = -1; | |
176 | ||
fb6f1fa2 YB |
177 | static const char *consumerd32_bin = CONFIG_CONSUMERD32_BIN; |
178 | static const char *consumerd64_bin = CONFIG_CONSUMERD64_BIN; | |
179 | static const char *consumerd32_libdir = CONFIG_CONSUMERD32_LIBDIR; | |
180 | static const char *consumerd64_libdir = CONFIG_CONSUMERD64_LIBDIR; | |
fb09408a MD |
181 | |
182 | static | |
7753dea8 | 183 | void setup_consumerd_path(void) |
fb09408a | 184 | { |
fc7a59ce | 185 | const char *bin, *libdir; |
fb09408a | 186 | |
7753dea8 MD |
187 | /* |
188 | * Allow INSTALL_BIN_PATH to be used as a target path for the | |
ebaeda94 MD |
189 | * native architecture size consumer if CONFIG_CONSUMER*_PATH |
190 | * has not been defined. | |
7753dea8 | 191 | */ |
ebaeda94 | 192 | #if (CAA_BITS_PER_LONG == 32) |
fc7a59ce AM |
193 | if (!consumerd32_bin[0]) { |
194 | consumerd32_bin = INSTALL_BIN_PATH "/" CONSUMERD_FILE; | |
ebaeda94 MD |
195 | } |
196 | if (!consumerd32_libdir[0]) { | |
197 | consumerd32_libdir = INSTALL_LIB_PATH; | |
198 | } | |
199 | #elif (CAA_BITS_PER_LONG == 64) | |
fc7a59ce AM |
200 | if (!consumerd64_bin[0]) { |
201 | consumerd64_bin = INSTALL_BIN_PATH "/" CONSUMERD_FILE; | |
7753dea8 | 202 | } |
ebaeda94 MD |
203 | if (!consumerd64_libdir[0]) { |
204 | consumerd64_libdir = INSTALL_LIB_PATH; | |
7753dea8 MD |
205 | } |
206 | #else | |
207 | #error "Unknown bitness" | |
208 | #endif | |
209 | ||
fb09408a MD |
210 | /* |
211 | * runtime env. var. overrides the build default. | |
212 | */ | |
fc7a59ce AM |
213 | bin = getenv("LTTNG_CONSUMERD32_BIN"); |
214 | if (bin) { | |
215 | consumerd32_bin = bin; | |
7753dea8 | 216 | } |
fc7a59ce AM |
217 | bin = getenv("LTTNG_CONSUMERD64_BIN"); |
218 | if (bin) { | |
219 | consumerd64_bin = bin; | |
ebaeda94 | 220 | } |
72f579ee | 221 | libdir = getenv("LTTNG_CONSUMERD32_LIBDIR"); |
ebaeda94 MD |
222 | if (libdir) { |
223 | consumerd32_libdir = libdir; | |
224 | } | |
72f579ee | 225 | libdir = getenv("LTTNG_CONSUMERD64_LIBDIR"); |
ebaeda94 MD |
226 | if (libdir) { |
227 | consumerd64_libdir = libdir; | |
fb09408a MD |
228 | } |
229 | } | |
230 | ||
5eb91c98 DG |
231 | /* |
232 | * Create a poll set with O_CLOEXEC and add the thread quit pipe to the set. | |
233 | */ | |
234 | static int create_thread_poll_set(struct lttng_poll_event *events, | |
235 | unsigned int size) | |
236 | { | |
237 | int ret; | |
238 | ||
239 | if (events == NULL || size == 0) { | |
240 | ret = -1; | |
241 | goto error; | |
242 | } | |
243 | ||
244 | ret = lttng_poll_create(events, size, LTTNG_CLOEXEC); | |
245 | if (ret < 0) { | |
246 | goto error; | |
247 | } | |
248 | ||
249 | /* Add quit pipe */ | |
250 | ret = lttng_poll_add(events, thread_quit_pipe[0], LPOLLIN); | |
251 | if (ret < 0) { | |
252 | goto error; | |
253 | } | |
254 | ||
255 | return 0; | |
256 | ||
257 | error: | |
258 | return ret; | |
259 | } | |
260 | ||
261 | /* | |
262 | * Check if the thread quit pipe was triggered. | |
263 | * | |
264 | * Return 1 if it was triggered else 0; | |
265 | */ | |
266 | static int check_thread_quit_pipe(int fd, uint32_t events) | |
267 | { | |
268 | if (fd == thread_quit_pipe[0] && (events & LPOLLIN)) { | |
269 | return 1; | |
270 | } | |
271 | ||
272 | return 0; | |
273 | } | |
274 | ||
0fdd1e2c DG |
275 | /* |
276 | * Return group ID of the tracing group or -1 if not found. | |
277 | */ | |
996b65c8 MD |
278 | static gid_t allowed_group(void) |
279 | { | |
280 | struct group *grp; | |
281 | ||
274e143b MD |
282 | if (opt_tracing_group) { |
283 | grp = getgrnam(opt_tracing_group); | |
284 | } else { | |
285 | grp = getgrnam(default_tracing_group); | |
286 | } | |
996b65c8 MD |
287 | if (!grp) { |
288 | return -1; | |
289 | } else { | |
290 | return grp->gr_gid; | |
291 | } | |
292 | } | |
293 | ||
273ea72c | 294 | /* |
5eb91c98 | 295 | * Init thread quit pipe. |
273ea72c DG |
296 | * |
297 | * Return -1 on error or 0 if all pipes are created. | |
298 | */ | |
299 | static int init_thread_quit_pipe(void) | |
300 | { | |
730389d9 | 301 | int ret, i; |
273ea72c | 302 | |
730389d9 | 303 | ret = pipe(thread_quit_pipe); |
273ea72c | 304 | if (ret < 0) { |
730389d9 | 305 | PERROR("thread quit pipe"); |
273ea72c DG |
306 | goto error; |
307 | } | |
308 | ||
730389d9 DG |
309 | for (i = 0; i < 2; i++) { |
310 | ret = fcntl(thread_quit_pipe[i], F_SETFD, FD_CLOEXEC); | |
311 | if (ret < 0) { | |
312 | PERROR("fcntl"); | |
313 | goto error; | |
314 | } | |
315 | } | |
316 | ||
273ea72c DG |
317 | error: |
318 | return ret; | |
319 | } | |
320 | ||
fac6795d | 321 | /* |
d063d709 DG |
322 | * Complete teardown of a kernel session. This free all data structure related |
323 | * to a kernel session and update counter. | |
fac6795d | 324 | */ |
1d4b027a | 325 | static void teardown_kernel_session(struct ltt_session *session) |
fac6795d | 326 | { |
8f7a84dd | 327 | if (!session->kernel_session) { |
99bab54f | 328 | DBG3("No kernel session when tearing down session"); |
84ea9c99 | 329 | return; |
8f7a84dd DG |
330 | } |
331 | ||
84ea9c99 | 332 | DBG("Tearing down kernel session"); |
d9800920 | 333 | |
84ea9c99 MD |
334 | /* |
335 | * If a custom kernel consumer was registered, close the socket before | |
336 | * tearing down the complete kernel session structure | |
337 | */ | |
03550b58 MD |
338 | if (kconsumer_data.cmd_sock >= 0 && |
339 | session->kernel_session->consumer_fd != kconsumer_data.cmd_sock) { | |
84ea9c99 | 340 | lttcomm_close_unix_sock(session->kernel_session->consumer_fd); |
fac6795d | 341 | } |
84ea9c99 MD |
342 | |
343 | trace_kernel_destroy_session(session->kernel_session); | |
fac6795d DG |
344 | } |
345 | ||
f6a9efaa DG |
346 | /* |
347 | * Complete teardown of all UST sessions. This will free everything on his path | |
348 | * and destroy the core essence of all ust sessions :) | |
349 | */ | |
350 | static void teardown_ust_session(struct ltt_session *session) | |
351 | { | |
84cd17c6 MD |
352 | int ret; |
353 | ||
8f7a84dd | 354 | if (!session->ust_session) { |
99bab54f | 355 | DBG3("No UST session when tearing down session"); |
f470a390 | 356 | return; |
8f7a84dd DG |
357 | } |
358 | ||
84ea9c99 | 359 | DBG("Tearing down UST session(s)"); |
8f7a84dd | 360 | |
84cd17c6 MD |
361 | ret = ust_app_destroy_trace_all(session->ust_session); |
362 | if (ret) { | |
363 | ERR("Error in ust_app_destroy_trace_all"); | |
364 | } | |
8f7a84dd | 365 | |
f6a9efaa DG |
366 | trace_ust_destroy_session(session->ust_session); |
367 | } | |
368 | ||
099e26bd DG |
369 | /* |
370 | * Stop all threads by closing the thread quit pipe. | |
371 | */ | |
cf3af59e MD |
372 | static void stop_threads(void) |
373 | { | |
5eb91c98 DG |
374 | int ret; |
375 | ||
cf3af59e MD |
376 | /* Stopping all threads */ |
377 | DBG("Terminating all threads"); | |
54d01ffb | 378 | ret = notify_thread_pipe(thread_quit_pipe[1]); |
5eb91c98 DG |
379 | if (ret < 0) { |
380 | ERR("write error on thread quit pipe"); | |
381 | } | |
382 | ||
099e26bd DG |
383 | /* Dispatch thread */ |
384 | dispatch_thread_exit = 1; | |
385 | futex_nto1_wake(&ust_cmd_queue.futex); | |
cf3af59e MD |
386 | } |
387 | ||
fac6795d | 388 | /* |
d063d709 | 389 | * Cleanup the daemon |
fac6795d | 390 | */ |
cf3af59e | 391 | static void cleanup(void) |
fac6795d | 392 | { |
76d7553f | 393 | int ret, i; |
1d4b027a | 394 | char *cmd; |
af9737e9 | 395 | struct ltt_session *sess, *stmp; |
fac6795d | 396 | |
1d4b027a | 397 | DBG("Cleaning up"); |
e07ae692 | 398 | |
67e40797 DG |
399 | DBG("Removing %s directory", rundir); |
400 | ret = asprintf(&cmd, "rm -rf %s", rundir); | |
401 | if (ret < 0) { | |
402 | ERR("asprintf failed. Something is really wrong!"); | |
403 | } | |
5461b305 | 404 | |
67e40797 DG |
405 | /* Remove lttng run directory */ |
406 | ret = system(cmd); | |
407 | if (ret < 0) { | |
408 | ERR("Unable to clean %s", rundir); | |
1d4b027a | 409 | } |
67e40797 | 410 | free(cmd); |
5461b305 | 411 | |
99bab54f | 412 | DBG("Cleaning up all sessions"); |
fac6795d | 413 | |
b5541356 | 414 | /* Destroy session list mutex */ |
273ea72c DG |
415 | if (session_list_ptr != NULL) { |
416 | pthread_mutex_destroy(&session_list_ptr->lock); | |
417 | ||
418 | /* Cleanup ALL session */ | |
54d01ffb DG |
419 | cds_list_for_each_entry_safe(sess, stmp, |
420 | &session_list_ptr->head, list) { | |
273ea72c | 421 | teardown_kernel_session(sess); |
f6a9efaa DG |
422 | teardown_ust_session(sess); |
423 | free(sess); | |
273ea72c DG |
424 | } |
425 | } | |
426 | ||
099e26bd | 427 | DBG("Closing all UST sockets"); |
56fff090 | 428 | ust_app_clean_list(); |
099e26bd | 429 | |
3bd1e081 | 430 | pthread_mutex_destroy(&kconsumer_data.pid_mutex); |
b5541356 | 431 | |
4fba7219 DG |
432 | if (is_root && !opt_no_kernel) { |
433 | DBG2("Closing kernel fd"); | |
a4b35e07 | 434 | if (kernel_tracer_fd >= 0) { |
76d7553f MD |
435 | ret = close(kernel_tracer_fd); |
436 | if (ret) { | |
437 | PERROR("close"); | |
438 | } | |
a4b35e07 | 439 | } |
2f50c8a3 | 440 | DBG("Unloading kernel modules"); |
096102bd | 441 | modprobe_remove_lttng_all(); |
2f50c8a3 | 442 | } |
5eb91c98 | 443 | |
76d7553f MD |
444 | /* |
445 | * Closing all pipes used for communication between threads. | |
446 | */ | |
447 | for (i = 0; i < 2; i++) { | |
448 | if (kernel_poll_pipe[i] >= 0) { | |
449 | ret = close(kernel_poll_pipe[i]); | |
450 | if (ret) { | |
451 | PERROR("close"); | |
452 | } | |
453 | ||
454 | } | |
455 | } | |
456 | for (i = 0; i < 2; i++) { | |
457 | if (thread_quit_pipe[i] >= 0) { | |
458 | ret = close(thread_quit_pipe[i]); | |
459 | if (ret) { | |
460 | PERROR("close"); | |
461 | } | |
462 | } | |
463 | } | |
464 | for (i = 0; i < 2; i++) { | |
465 | if (apps_cmd_pipe[i] >= 0) { | |
466 | ret = close(apps_cmd_pipe[i]); | |
467 | if (ret) { | |
468 | PERROR("close"); | |
469 | } | |
470 | } | |
471 | } | |
421cb601 DG |
472 | |
473 | /* <fun> */ | |
f56a39af | 474 | DBG("%c[%d;%dm*** assert failed :-) *** ==> %c[%dm%c[%d;%dm" |
421cb601 DG |
475 | "Matthew, BEET driven development works!%c[%dm", |
476 | 27, 1, 31, 27, 0, 27, 1, 33, 27, 0); | |
477 | /* </fun> */ | |
fac6795d DG |
478 | } |
479 | ||
e065084a | 480 | /* |
d063d709 | 481 | * Send data on a unix socket using the liblttsessiondcomm API. |
e065084a | 482 | * |
d063d709 | 483 | * Return lttcomm error code. |
e065084a DG |
484 | */ |
485 | static int send_unix_sock(int sock, void *buf, size_t len) | |
486 | { | |
487 | /* Check valid length */ | |
488 | if (len <= 0) { | |
489 | return -1; | |
490 | } | |
491 | ||
492 | return lttcomm_send_unix_sock(sock, buf, len); | |
493 | } | |
494 | ||
5461b305 | 495 | /* |
d063d709 | 496 | * Free memory of a command context structure. |
5461b305 | 497 | */ |
a2fb29a5 | 498 | static void clean_command_ctx(struct command_ctx **cmd_ctx) |
5461b305 | 499 | { |
a2fb29a5 DG |
500 | DBG("Clean command context structure"); |
501 | if (*cmd_ctx) { | |
502 | if ((*cmd_ctx)->llm) { | |
503 | free((*cmd_ctx)->llm); | |
5461b305 | 504 | } |
a2fb29a5 DG |
505 | if ((*cmd_ctx)->lsm) { |
506 | free((*cmd_ctx)->lsm); | |
5461b305 | 507 | } |
a2fb29a5 DG |
508 | free(*cmd_ctx); |
509 | *cmd_ctx = NULL; | |
5461b305 DG |
510 | } |
511 | } | |
512 | ||
f3ed775e | 513 | /* |
d063d709 | 514 | * Send all stream fds of kernel channel to the consumer. |
f3ed775e | 515 | */ |
2bdd86d4 | 516 | static int send_kconsumer_channel_streams(struct consumer_data *consumer_data, |
6df2e2c9 MD |
517 | int sock, struct ltt_kernel_channel *channel, |
518 | uid_t uid, gid_t gid) | |
f3ed775e DG |
519 | { |
520 | int ret; | |
f3ed775e | 521 | struct ltt_kernel_stream *stream; |
3bd1e081 | 522 | struct lttcomm_consumer_msg lkm; |
f3ed775e | 523 | |
3bd1e081 | 524 | DBG("Sending streams of channel %s to kernel consumer", |
54d01ffb | 525 | channel->channel->name); |
f3ed775e | 526 | |
3bd1e081 MD |
527 | /* Send channel */ |
528 | lkm.cmd_type = LTTNG_CONSUMER_ADD_CHANNEL; | |
529 | lkm.u.channel.channel_key = channel->fd; | |
530 | lkm.u.channel.max_sb_size = channel->channel->attr.subbuf_size; | |
531 | lkm.u.channel.mmap_len = 0; /* for kernel */ | |
2bdd86d4 | 532 | DBG("Sending channel %d to consumer", lkm.u.channel.channel_key); |
3bd1e081 | 533 | ret = lttcomm_send_unix_sock(sock, &lkm, sizeof(lkm)); |
f3ed775e | 534 | if (ret < 0) { |
76d7553f | 535 | PERROR("send consumer channel"); |
f3ed775e DG |
536 | goto error; |
537 | } | |
538 | ||
3bd1e081 | 539 | /* Send streams */ |
7a485870 | 540 | cds_list_for_each_entry(stream, &channel->stream_list.head, list) { |
3bd1e081 MD |
541 | if (!stream->fd) { |
542 | continue; | |
543 | } | |
544 | lkm.cmd_type = LTTNG_CONSUMER_ADD_STREAM; | |
545 | lkm.u.stream.channel_key = channel->fd; | |
546 | lkm.u.stream.stream_key = stream->fd; | |
547 | lkm.u.stream.state = stream->state; | |
548 | lkm.u.stream.output = channel->channel->attr.output; | |
549 | lkm.u.stream.mmap_len = 0; /* for kernel */ | |
6df2e2c9 MD |
550 | lkm.u.stream.uid = uid; |
551 | lkm.u.stream.gid = gid; | |
3bd1e081 MD |
552 | strncpy(lkm.u.stream.path_name, stream->pathname, PATH_MAX - 1); |
553 | lkm.u.stream.path_name[PATH_MAX - 1] = '\0'; | |
554 | DBG("Sending stream %d to consumer", lkm.u.stream.stream_key); | |
555 | ret = lttcomm_send_unix_sock(sock, &lkm, sizeof(lkm)); | |
556 | if (ret < 0) { | |
76d7553f | 557 | PERROR("send consumer stream"); |
3bd1e081 MD |
558 | goto error; |
559 | } | |
560 | ret = lttcomm_send_fds_unix_sock(sock, &stream->fd, 1); | |
561 | if (ret < 0) { | |
76d7553f | 562 | PERROR("send consumer stream ancillary data"); |
3bd1e081 | 563 | goto error; |
f3ed775e DG |
564 | } |
565 | } | |
566 | ||
3bd1e081 | 567 | DBG("consumer channel streams sent"); |
f3ed775e DG |
568 | |
569 | return 0; | |
570 | ||
571 | error: | |
572 | return ret; | |
573 | } | |
574 | ||
575 | /* | |
d063d709 | 576 | * Send all stream fds of the kernel session to the consumer. |
f3ed775e | 577 | */ |
2bdd86d4 | 578 | static int send_kconsumer_session_streams(struct consumer_data *consumer_data, |
3bd1e081 | 579 | struct ltt_kernel_session *session) |
f3ed775e DG |
580 | { |
581 | int ret; | |
582 | struct ltt_kernel_channel *chan; | |
3bd1e081 MD |
583 | struct lttcomm_consumer_msg lkm; |
584 | int sock = session->consumer_fd; | |
7a485870 DG |
585 | |
586 | DBG("Sending metadata stream fd"); | |
587 | ||
03550b58 MD |
588 | /* Extra protection. It's NOT supposed to be set to -1 at this point */ |
589 | if (session->consumer_fd < 0) { | |
3bd1e081 | 590 | session->consumer_fd = consumer_data->cmd_sock; |
d9800920 DG |
591 | } |
592 | ||
03550b58 | 593 | if (session->metadata_stream_fd >= 0) { |
3bd1e081 MD |
594 | /* Send metadata channel fd */ |
595 | lkm.cmd_type = LTTNG_CONSUMER_ADD_CHANNEL; | |
596 | lkm.u.channel.channel_key = session->metadata->fd; | |
597 | lkm.u.channel.max_sb_size = session->metadata->conf->attr.subbuf_size; | |
598 | lkm.u.channel.mmap_len = 0; /* for kernel */ | |
032b44f0 | 599 | DBG("Sending metadata channel %d to consumer", lkm.u.channel.channel_key); |
3bd1e081 MD |
600 | ret = lttcomm_send_unix_sock(sock, &lkm, sizeof(lkm)); |
601 | if (ret < 0) { | |
76d7553f | 602 | PERROR("send consumer channel"); |
3bd1e081 MD |
603 | goto error; |
604 | } | |
605 | ||
606 | /* Send metadata stream fd */ | |
607 | lkm.cmd_type = LTTNG_CONSUMER_ADD_STREAM; | |
608 | lkm.u.stream.channel_key = session->metadata->fd; | |
609 | lkm.u.stream.stream_key = session->metadata_stream_fd; | |
610 | lkm.u.stream.state = LTTNG_CONSUMER_ACTIVE_STREAM; | |
611 | lkm.u.stream.output = DEFAULT_KERNEL_CHANNEL_OUTPUT; | |
612 | lkm.u.stream.mmap_len = 0; /* for kernel */ | |
6df2e2c9 MD |
613 | lkm.u.stream.uid = session->uid; |
614 | lkm.u.stream.gid = session->gid; | |
3bd1e081 MD |
615 | strncpy(lkm.u.stream.path_name, session->metadata->pathname, PATH_MAX - 1); |
616 | lkm.u.stream.path_name[PATH_MAX - 1] = '\0'; | |
617 | DBG("Sending metadata stream %d to consumer", lkm.u.stream.stream_key); | |
618 | ret = lttcomm_send_unix_sock(sock, &lkm, sizeof(lkm)); | |
619 | if (ret < 0) { | |
76d7553f | 620 | PERROR("send consumer stream"); |
3bd1e081 MD |
621 | goto error; |
622 | } | |
623 | ret = lttcomm_send_fds_unix_sock(sock, &session->metadata_stream_fd, 1); | |
7a485870 | 624 | if (ret < 0) { |
76d7553f | 625 | PERROR("send consumer stream"); |
7a485870 DG |
626 | goto error; |
627 | } | |
628 | } | |
f3ed775e | 629 | |
f3ed775e | 630 | cds_list_for_each_entry(chan, &session->channel_list.head, list) { |
6df2e2c9 MD |
631 | ret = send_kconsumer_channel_streams(consumer_data, sock, chan, |
632 | session->uid, session->gid); | |
2bdd86d4 MD |
633 | if (ret < 0) { |
634 | goto error; | |
635 | } | |
636 | } | |
637 | ||
638 | DBG("consumer fds (metadata and channel streams) sent"); | |
639 | ||
640 | return 0; | |
641 | ||
642 | error: | |
643 | return ret; | |
644 | } | |
645 | ||
fac6795d | 646 | /* |
0fdd1e2c | 647 | * Notify UST applications using the shm mmap futex. |
fac6795d | 648 | */ |
0fdd1e2c | 649 | static int notify_ust_apps(int active) |
fac6795d | 650 | { |
0fdd1e2c | 651 | char *wait_shm_mmap; |
fac6795d | 652 | |
0fdd1e2c | 653 | DBG("Notifying applications of session daemon state: %d", active); |
e07ae692 | 654 | |
0fdd1e2c DG |
655 | /* See shm.c for this call implying mmap, shm and futex calls */ |
656 | wait_shm_mmap = shm_ust_get_mmap(wait_shm_path, is_root); | |
657 | if (wait_shm_mmap == NULL) { | |
fac6795d DG |
658 | goto error; |
659 | } | |
660 | ||
0fdd1e2c DG |
661 | /* Wake waiting process */ |
662 | futex_wait_update((int32_t *) wait_shm_mmap, active); | |
663 | ||
664 | /* Apps notified successfully */ | |
665 | return 0; | |
fac6795d DG |
666 | |
667 | error: | |
0fdd1e2c | 668 | return -1; |
fac6795d DG |
669 | } |
670 | ||
e065084a | 671 | /* |
d063d709 DG |
672 | * Setup the outgoing data buffer for the response (llm) by allocating the |
673 | * right amount of memory and copying the original information from the lsm | |
674 | * structure. | |
ca95a216 | 675 | * |
d063d709 | 676 | * Return total size of the buffer pointed by buf. |
ca95a216 | 677 | */ |
5461b305 | 678 | static int setup_lttng_msg(struct command_ctx *cmd_ctx, size_t size) |
ca95a216 | 679 | { |
f3ed775e | 680 | int ret, buf_size; |
ca95a216 | 681 | |
f3ed775e | 682 | buf_size = size; |
5461b305 | 683 | |
ba7f0ae5 | 684 | cmd_ctx->llm = zmalloc(sizeof(struct lttcomm_lttng_msg) + buf_size); |
5461b305 | 685 | if (cmd_ctx->llm == NULL) { |
76d7553f | 686 | PERROR("zmalloc"); |
5461b305 | 687 | ret = -ENOMEM; |
ca95a216 DG |
688 | goto error; |
689 | } | |
690 | ||
5461b305 DG |
691 | /* Copy common data */ |
692 | cmd_ctx->llm->cmd_type = cmd_ctx->lsm->cmd_type; | |
9f19cc17 | 693 | cmd_ctx->llm->pid = cmd_ctx->lsm->domain.attr.pid; |
5461b305 | 694 | |
5461b305 DG |
695 | cmd_ctx->llm->data_size = size; |
696 | cmd_ctx->lttng_msg_size = sizeof(struct lttcomm_lttng_msg) + buf_size; | |
697 | ||
ca95a216 DG |
698 | return buf_size; |
699 | ||
700 | error: | |
701 | return ret; | |
702 | } | |
703 | ||
7a485870 | 704 | /* |
5eb91c98 | 705 | * Update the kernel poll set of all channel fd available over all tracing |
d063d709 | 706 | * session. Add the wakeup pipe at the end of the set. |
7a485870 | 707 | */ |
5eb91c98 | 708 | static int update_kernel_poll(struct lttng_poll_event *events) |
7a485870 | 709 | { |
5eb91c98 | 710 | int ret; |
7a485870 DG |
711 | struct ltt_session *session; |
712 | struct ltt_kernel_channel *channel; | |
713 | ||
5eb91c98 | 714 | DBG("Updating kernel poll set"); |
7a485870 | 715 | |
54d01ffb | 716 | session_lock_list(); |
b5541356 | 717 | cds_list_for_each_entry(session, &session_list_ptr->head, list) { |
54d01ffb | 718 | session_lock(session); |
7a485870 | 719 | if (session->kernel_session == NULL) { |
54d01ffb | 720 | session_unlock(session); |
7a485870 DG |
721 | continue; |
722 | } | |
7a485870 | 723 | |
54d01ffb DG |
724 | cds_list_for_each_entry(channel, |
725 | &session->kernel_session->channel_list.head, list) { | |
5eb91c98 DG |
726 | /* Add channel fd to the kernel poll set */ |
727 | ret = lttng_poll_add(events, channel->fd, LPOLLIN | LPOLLRDNORM); | |
728 | if (ret < 0) { | |
54d01ffb | 729 | session_unlock(session); |
5eb91c98 DG |
730 | goto error; |
731 | } | |
732 | DBG("Channel fd %d added to kernel set", channel->fd); | |
7a485870 | 733 | } |
54d01ffb | 734 | session_unlock(session); |
7a485870 | 735 | } |
54d01ffb | 736 | session_unlock_list(); |
7a485870 | 737 | |
5eb91c98 | 738 | return 0; |
7a485870 DG |
739 | |
740 | error: | |
54d01ffb | 741 | session_unlock_list(); |
7a485870 DG |
742 | return -1; |
743 | } | |
744 | ||
745 | /* | |
54d01ffb | 746 | * Find the channel fd from 'fd' over all tracing session. When found, check |
d063d709 | 747 | * for new channel stream and send those stream fds to the kernel consumer. |
7a485870 | 748 | * |
d063d709 | 749 | * Useful for CPU hotplug feature. |
7a485870 | 750 | */ |
2bdd86d4 | 751 | static int update_kernel_stream(struct consumer_data *consumer_data, int fd) |
7a485870 DG |
752 | { |
753 | int ret = 0; | |
754 | struct ltt_session *session; | |
755 | struct ltt_kernel_channel *channel; | |
756 | ||
757 | DBG("Updating kernel streams for channel fd %d", fd); | |
758 | ||
54d01ffb | 759 | session_lock_list(); |
b5541356 | 760 | cds_list_for_each_entry(session, &session_list_ptr->head, list) { |
54d01ffb | 761 | session_lock(session); |
7a485870 | 762 | if (session->kernel_session == NULL) { |
54d01ffb | 763 | session_unlock(session); |
7a485870 DG |
764 | continue; |
765 | } | |
d9800920 | 766 | |
03550b58 MD |
767 | /* This is not suppose to be -1 but this is an extra security check */ |
768 | if (session->kernel_session->consumer_fd < 0) { | |
3bd1e081 | 769 | session->kernel_session->consumer_fd = consumer_data->cmd_sock; |
d9800920 DG |
770 | } |
771 | ||
5eb91c98 DG |
772 | cds_list_for_each_entry(channel, |
773 | &session->kernel_session->channel_list.head, list) { | |
7a485870 DG |
774 | if (channel->fd == fd) { |
775 | DBG("Channel found, updating kernel streams"); | |
776 | ret = kernel_open_channel_stream(channel); | |
777 | if (ret < 0) { | |
b3c750d2 | 778 | goto error; |
7a485870 | 779 | } |
d9800920 | 780 | |
7a485870 | 781 | /* |
5eb91c98 DG |
782 | * Have we already sent fds to the consumer? If yes, it means |
783 | * that tracing is started so it is safe to send our updated | |
784 | * stream fds. | |
7a485870 | 785 | */ |
3bd1e081 | 786 | if (session->kernel_session->consumer_fds_sent == 1) { |
2bdd86d4 | 787 | ret = send_kconsumer_channel_streams(consumer_data, |
6df2e2c9 MD |
788 | session->kernel_session->consumer_fd, channel, |
789 | session->uid, session->gid); | |
7a485870 | 790 | if (ret < 0) { |
b3c750d2 | 791 | goto error; |
7a485870 DG |
792 | } |
793 | } | |
b3c750d2 | 794 | goto error; |
7a485870 DG |
795 | } |
796 | } | |
54d01ffb | 797 | session_unlock(session); |
7a485870 | 798 | } |
54d01ffb | 799 | session_unlock_list(); |
b3c750d2 | 800 | return ret; |
7a485870 | 801 | |
b3c750d2 | 802 | error: |
54d01ffb DG |
803 | session_unlock(session); |
804 | session_unlock_list(); | |
7a485870 DG |
805 | return ret; |
806 | } | |
807 | ||
487cf67c DG |
808 | /* |
809 | * For each tracing session, update newly registered apps. | |
810 | */ | |
811 | static void update_ust_app(int app_sock) | |
812 | { | |
813 | struct ltt_session *sess, *stmp; | |
814 | ||
4ee14516 DG |
815 | session_lock_list(); |
816 | ||
487cf67c DG |
817 | /* For all tracing session(s) */ |
818 | cds_list_for_each_entry_safe(sess, stmp, &session_list_ptr->head, list) { | |
4ee14516 | 819 | session_lock(sess); |
421cb601 DG |
820 | if (sess->ust_session) { |
821 | ust_app_global_update(sess->ust_session, app_sock); | |
822 | } | |
4ee14516 | 823 | session_unlock(sess); |
487cf67c | 824 | } |
4ee14516 DG |
825 | |
826 | session_unlock_list(); | |
487cf67c DG |
827 | } |
828 | ||
7a485870 | 829 | /* |
d063d709 | 830 | * This thread manage event coming from the kernel. |
7a485870 | 831 | * |
d063d709 DG |
832 | * Features supported in this thread: |
833 | * -) CPU Hotplug | |
7a485870 DG |
834 | */ |
835 | static void *thread_manage_kernel(void *data) | |
836 | { | |
5eb91c98 DG |
837 | int ret, i, pollfd, update_poll_flag = 1; |
838 | uint32_t revents, nb_fd; | |
7a485870 | 839 | char tmp; |
5eb91c98 | 840 | struct lttng_poll_event events; |
7a485870 DG |
841 | |
842 | DBG("Thread manage kernel started"); | |
843 | ||
5eb91c98 DG |
844 | ret = create_thread_poll_set(&events, 2); |
845 | if (ret < 0) { | |
76d7553f | 846 | goto error_poll_create; |
5eb91c98 DG |
847 | } |
848 | ||
849 | ret = lttng_poll_add(&events, kernel_poll_pipe[0], LPOLLIN); | |
850 | if (ret < 0) { | |
851 | goto error; | |
852 | } | |
853 | ||
7a485870 DG |
854 | while (1) { |
855 | if (update_poll_flag == 1) { | |
5f822d0a DG |
856 | /* |
857 | * Reset number of fd in the poll set. Always 2 since there is the thread | |
858 | * quit pipe and the kernel pipe. | |
859 | */ | |
860 | events.nb_fd = 2; | |
861 | ||
5eb91c98 DG |
862 | ret = update_kernel_poll(&events); |
863 | if (ret < 0) { | |
7a485870 DG |
864 | goto error; |
865 | } | |
866 | update_poll_flag = 0; | |
867 | } | |
868 | ||
5eb91c98 DG |
869 | nb_fd = LTTNG_POLL_GETNB(&events); |
870 | ||
871 | DBG("Thread kernel polling on %d fds", nb_fd); | |
872 | ||
873 | /* Zeroed the poll events */ | |
874 | lttng_poll_reset(&events); | |
7a485870 DG |
875 | |
876 | /* Poll infinite value of time */ | |
88f2b785 | 877 | restart: |
5eb91c98 | 878 | ret = lttng_poll_wait(&events, -1); |
7a485870 | 879 | if (ret < 0) { |
88f2b785 MD |
880 | /* |
881 | * Restart interrupted system call. | |
882 | */ | |
883 | if (errno == EINTR) { | |
884 | goto restart; | |
885 | } | |
7a485870 DG |
886 | goto error; |
887 | } else if (ret == 0) { | |
888 | /* Should not happen since timeout is infinite */ | |
85611738 DG |
889 | ERR("Return value of poll is 0 with an infinite timeout.\n" |
890 | "This should not have happened! Continuing..."); | |
7a485870 DG |
891 | continue; |
892 | } | |
893 | ||
5eb91c98 DG |
894 | for (i = 0; i < nb_fd; i++) { |
895 | /* Fetch once the poll data */ | |
896 | revents = LTTNG_POLL_GETEV(&events, i); | |
897 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
7a485870 | 898 | |
5eb91c98 DG |
899 | /* Thread quit pipe has been closed. Killing thread. */ |
900 | ret = check_thread_quit_pipe(pollfd, revents); | |
901 | if (ret) { | |
902 | goto error; | |
903 | } | |
7a485870 | 904 | |
5eb91c98 DG |
905 | /* Check for data on kernel pipe */ |
906 | if (pollfd == kernel_poll_pipe[0] && (revents & LPOLLIN)) { | |
907 | ret = read(kernel_poll_pipe[0], &tmp, 1); | |
908 | update_poll_flag = 1; | |
909 | continue; | |
910 | } else { | |
911 | /* | |
912 | * New CPU detected by the kernel. Adding kernel stream to | |
913 | * kernel session and updating the kernel consumer | |
914 | */ | |
915 | if (revents & LPOLLIN) { | |
2bdd86d4 | 916 | ret = update_kernel_stream(&kconsumer_data, pollfd); |
5eb91c98 DG |
917 | if (ret < 0) { |
918 | continue; | |
919 | } | |
920 | break; | |
921 | /* | |
922 | * TODO: We might want to handle the LPOLLERR | LPOLLHUP | |
923 | * and unregister kernel stream at this point. | |
924 | */ | |
7a485870 | 925 | } |
7a485870 DG |
926 | } |
927 | } | |
928 | } | |
929 | ||
930 | error: | |
5eb91c98 | 931 | lttng_poll_clean(&events); |
76d7553f MD |
932 | error_poll_create: |
933 | DBG("Kernel thread dying"); | |
7a485870 DG |
934 | return NULL; |
935 | } | |
936 | ||
1d4b027a | 937 | /* |
3bd1e081 | 938 | * This thread manage the consumer error sent back to the session daemon. |
1d4b027a | 939 | */ |
3bd1e081 | 940 | static void *thread_manage_consumer(void *data) |
1d4b027a | 941 | { |
76d7553f | 942 | int sock = -1, i, ret, pollfd; |
5eb91c98 | 943 | uint32_t revents, nb_fd; |
1d4b027a | 944 | enum lttcomm_return_code code; |
5eb91c98 | 945 | struct lttng_poll_event events; |
3bd1e081 | 946 | struct consumer_data *consumer_data = data; |
1d4b027a | 947 | |
3bd1e081 | 948 | DBG("[thread] Manage consumer started"); |
1d4b027a | 949 | |
3bd1e081 | 950 | ret = lttcomm_listen_unix_sock(consumer_data->err_sock); |
1d4b027a | 951 | if (ret < 0) { |
76d7553f | 952 | goto error_listen; |
1d4b027a DG |
953 | } |
954 | ||
5eb91c98 DG |
955 | /* |
956 | * Pass 2 as size here for the thread quit pipe and kconsumerd_err_sock. | |
957 | * Nothing more will be added to this poll set. | |
958 | */ | |
959 | ret = create_thread_poll_set(&events, 2); | |
960 | if (ret < 0) { | |
76d7553f | 961 | goto error_poll; |
5eb91c98 | 962 | } |
273ea72c | 963 | |
3bd1e081 | 964 | ret = lttng_poll_add(&events, consumer_data->err_sock, LPOLLIN | LPOLLRDHUP); |
5eb91c98 DG |
965 | if (ret < 0) { |
966 | goto error; | |
967 | } | |
968 | ||
969 | nb_fd = LTTNG_POLL_GETNB(&events); | |
273ea72c DG |
970 | |
971 | /* Inifinite blocking call, waiting for transmission */ | |
88f2b785 | 972 | restart: |
5eb91c98 | 973 | ret = lttng_poll_wait(&events, -1); |
273ea72c | 974 | if (ret < 0) { |
88f2b785 MD |
975 | /* |
976 | * Restart interrupted system call. | |
977 | */ | |
978 | if (errno == EINTR) { | |
979 | goto restart; | |
980 | } | |
273ea72c DG |
981 | goto error; |
982 | } | |
983 | ||
5eb91c98 DG |
984 | for (i = 0; i < nb_fd; i++) { |
985 | /* Fetch once the poll data */ | |
986 | revents = LTTNG_POLL_GETEV(&events, i); | |
987 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
988 | ||
989 | /* Thread quit pipe has been closed. Killing thread. */ | |
990 | ret = check_thread_quit_pipe(pollfd, revents); | |
991 | if (ret) { | |
992 | goto error; | |
993 | } | |
994 | ||
995 | /* Event on the registration socket */ | |
3bd1e081 | 996 | if (pollfd == consumer_data->err_sock) { |
5eb91c98 | 997 | if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { |
3bd1e081 | 998 | ERR("consumer err socket poll error"); |
5eb91c98 DG |
999 | goto error; |
1000 | } | |
1001 | } | |
273ea72c DG |
1002 | } |
1003 | ||
3bd1e081 | 1004 | sock = lttcomm_accept_unix_sock(consumer_data->err_sock); |
1d4b027a DG |
1005 | if (sock < 0) { |
1006 | goto error; | |
1007 | } | |
1008 | ||
3bd1e081 | 1009 | DBG2("Receiving code from consumer err_sock"); |
ee0b0061 | 1010 | |
712ea556 | 1011 | /* Getting status code from kconsumerd */ |
54d01ffb DG |
1012 | ret = lttcomm_recv_unix_sock(sock, &code, |
1013 | sizeof(enum lttcomm_return_code)); | |
1d4b027a DG |
1014 | if (ret <= 0) { |
1015 | goto error; | |
1016 | } | |
1017 | ||
3bd1e081 MD |
1018 | if (code == CONSUMERD_COMMAND_SOCK_READY) { |
1019 | consumer_data->cmd_sock = | |
1020 | lttcomm_connect_unix_sock(consumer_data->cmd_unix_sock_path); | |
1021 | if (consumer_data->cmd_sock < 0) { | |
1022 | sem_post(&consumer_data->sem); | |
48842b30 | 1023 | PERROR("consumer connect"); |
1d4b027a DG |
1024 | goto error; |
1025 | } | |
1026 | /* Signal condition to tell that the kconsumerd is ready */ | |
3bd1e081 MD |
1027 | sem_post(&consumer_data->sem); |
1028 | DBG("consumer command socket ready"); | |
1d4b027a | 1029 | } else { |
3bd1e081 | 1030 | ERR("consumer error when waiting for SOCK_READY : %s", |
1d4b027a DG |
1031 | lttcomm_get_readable_code(-code)); |
1032 | goto error; | |
1033 | } | |
1034 | ||
54d01ffb | 1035 | /* Remove the kconsumerd error sock since we've established a connexion */ |
3bd1e081 | 1036 | ret = lttng_poll_del(&events, consumer_data->err_sock); |
72079cae | 1037 | if (ret < 0) { |
72079cae DG |
1038 | goto error; |
1039 | } | |
1040 | ||
5eb91c98 DG |
1041 | ret = lttng_poll_add(&events, sock, LPOLLIN | LPOLLRDHUP); |
1042 | if (ret < 0) { | |
72079cae | 1043 | goto error; |
5eb91c98 DG |
1044 | } |
1045 | ||
1046 | /* Update number of fd */ | |
1047 | nb_fd = LTTNG_POLL_GETNB(&events); | |
1048 | ||
1049 | /* Inifinite blocking call, waiting for transmission */ | |
88f2b785 | 1050 | restart_poll: |
5eb91c98 DG |
1051 | ret = lttng_poll_wait(&events, -1); |
1052 | if (ret < 0) { | |
88f2b785 MD |
1053 | /* |
1054 | * Restart interrupted system call. | |
1055 | */ | |
1056 | if (errno == EINTR) { | |
1057 | goto restart_poll; | |
1058 | } | |
72079cae DG |
1059 | goto error; |
1060 | } | |
1061 | ||
5eb91c98 DG |
1062 | for (i = 0; i < nb_fd; i++) { |
1063 | /* Fetch once the poll data */ | |
1064 | revents = LTTNG_POLL_GETEV(&events, i); | |
1065 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
1066 | ||
1067 | /* Thread quit pipe has been closed. Killing thread. */ | |
1068 | ret = check_thread_quit_pipe(pollfd, revents); | |
1069 | if (ret) { | |
1070 | goto error; | |
1071 | } | |
1072 | ||
1073 | /* Event on the kconsumerd socket */ | |
1074 | if (pollfd == sock) { | |
1075 | if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { | |
3bd1e081 | 1076 | ERR("consumer err socket second poll error"); |
5eb91c98 DG |
1077 | goto error; |
1078 | } | |
1079 | } | |
1080 | } | |
1081 | ||
712ea556 | 1082 | /* Wait for any kconsumerd error */ |
54d01ffb DG |
1083 | ret = lttcomm_recv_unix_sock(sock, &code, |
1084 | sizeof(enum lttcomm_return_code)); | |
712ea556 | 1085 | if (ret <= 0) { |
3bd1e081 | 1086 | ERR("consumer closed the command socket"); |
712ea556 | 1087 | goto error; |
6f61d021 | 1088 | } |
1d4b027a | 1089 | |
3bd1e081 | 1090 | ERR("consumer return code : %s", lttcomm_get_readable_code(-code)); |
712ea556 | 1091 | |
1d4b027a | 1092 | error: |
76d7553f MD |
1093 | if (consumer_data->err_sock >= 0) { |
1094 | ret = close(consumer_data->err_sock); | |
1095 | if (ret) { | |
1096 | PERROR("close"); | |
1097 | } | |
1098 | } | |
1099 | if (consumer_data->cmd_sock >= 0) { | |
1100 | ret = close(consumer_data->cmd_sock); | |
1101 | if (ret) { | |
1102 | PERROR("close"); | |
1103 | } | |
1104 | } | |
1105 | if (sock >= 0) { | |
1106 | ret = close(sock); | |
1107 | if (ret) { | |
1108 | PERROR("close"); | |
1109 | } | |
1110 | } | |
273ea72c | 1111 | |
3bd1e081 MD |
1112 | unlink(consumer_data->err_unix_sock_path); |
1113 | unlink(consumer_data->cmd_unix_sock_path); | |
1114 | consumer_data->pid = 0; | |
1d4b027a | 1115 | |
5eb91c98 | 1116 | lttng_poll_clean(&events); |
76d7553f MD |
1117 | error_poll: |
1118 | error_listen: | |
1119 | DBG("consumer thread cleanup completed"); | |
0177d773 | 1120 | |
5eb91c98 | 1121 | return NULL; |
099e26bd DG |
1122 | } |
1123 | ||
099e26bd DG |
1124 | /* |
1125 | * This thread manage application communication. | |
1d4b027a DG |
1126 | */ |
1127 | static void *thread_manage_apps(void *data) | |
099e26bd | 1128 | { |
5eb91c98 DG |
1129 | int i, ret, pollfd; |
1130 | uint32_t revents, nb_fd; | |
099e26bd | 1131 | struct ust_command ust_cmd; |
5eb91c98 | 1132 | struct lttng_poll_event events; |
099e26bd DG |
1133 | |
1134 | DBG("[thread] Manage application started"); | |
1135 | ||
f6a9efaa DG |
1136 | rcu_register_thread(); |
1137 | rcu_thread_online(); | |
1138 | ||
5eb91c98 DG |
1139 | ret = create_thread_poll_set(&events, 2); |
1140 | if (ret < 0) { | |
76d7553f | 1141 | goto error_poll_create; |
5eb91c98 | 1142 | } |
099e26bd | 1143 | |
5eb91c98 DG |
1144 | ret = lttng_poll_add(&events, apps_cmd_pipe[0], LPOLLIN | LPOLLRDHUP); |
1145 | if (ret < 0) { | |
1146 | goto error; | |
1147 | } | |
099e26bd | 1148 | |
5eb91c98 DG |
1149 | while (1) { |
1150 | /* Zeroed the events structure */ | |
1151 | lttng_poll_reset(&events); | |
0177d773 | 1152 | |
5eb91c98 | 1153 | nb_fd = LTTNG_POLL_GETNB(&events); |
099e26bd DG |
1154 | |
1155 | DBG("Apps thread polling on %d fds", nb_fd); | |
1156 | ||
1157 | /* Inifinite blocking call, waiting for transmission */ | |
88f2b785 | 1158 | restart: |
5eb91c98 | 1159 | ret = lttng_poll_wait(&events, -1); |
099e26bd | 1160 | if (ret < 0) { |
88f2b785 MD |
1161 | /* |
1162 | * Restart interrupted system call. | |
1163 | */ | |
1164 | if (errno == EINTR) { | |
1165 | goto restart; | |
1166 | } | |
099e26bd DG |
1167 | goto error; |
1168 | } | |
1169 | ||
5eb91c98 DG |
1170 | for (i = 0; i < nb_fd; i++) { |
1171 | /* Fetch once the poll data */ | |
1172 | revents = LTTNG_POLL_GETEV(&events, i); | |
1173 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
1174 | ||
1175 | /* Thread quit pipe has been closed. Killing thread. */ | |
1176 | ret = check_thread_quit_pipe(pollfd, revents); | |
1177 | if (ret) { | |
099e26bd | 1178 | goto error; |
5eb91c98 | 1179 | } |
099e26bd | 1180 | |
5eb91c98 DG |
1181 | /* Inspect the apps cmd pipe */ |
1182 | if (pollfd == apps_cmd_pipe[0]) { | |
1183 | if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { | |
1184 | ERR("Apps command pipe error"); | |
0177d773 | 1185 | goto error; |
5eb91c98 DG |
1186 | } else if (revents & LPOLLIN) { |
1187 | /* Empty pipe */ | |
1188 | ret = read(apps_cmd_pipe[0], &ust_cmd, sizeof(ust_cmd)); | |
1189 | if (ret < 0 || ret < sizeof(ust_cmd)) { | |
76d7553f | 1190 | PERROR("read apps cmd pipe"); |
5eb91c98 DG |
1191 | goto error; |
1192 | } | |
099e26bd | 1193 | |
5eb91c98 | 1194 | /* Register applicaton to the session daemon */ |
56fff090 | 1195 | ret = ust_app_register(&ust_cmd.reg_msg, |
54d01ffb | 1196 | ust_cmd.sock); |
88ff5b7f | 1197 | if (ret == -ENOMEM) { |
5eb91c98 | 1198 | goto error; |
88ff5b7f MD |
1199 | } else if (ret < 0) { |
1200 | break; | |
5eb91c98 DG |
1201 | } |
1202 | ||
acc7b41b | 1203 | /* |
e0c7ec2b | 1204 | * Validate UST version compatibility. |
acc7b41b | 1205 | */ |
e0c7ec2b DG |
1206 | ret = ust_app_validate_version(ust_cmd.sock); |
1207 | if (ret >= 0) { | |
1208 | /* | |
1209 | * Add channel(s) and event(s) to newly registered apps | |
1210 | * from lttng global UST domain. | |
1211 | */ | |
1212 | update_ust_app(ust_cmd.sock); | |
1213 | } | |
acc7b41b | 1214 | |
f2ca2e25 | 1215 | ret = ust_app_register_done(ust_cmd.sock); |
5eb91c98 DG |
1216 | if (ret < 0) { |
1217 | /* | |
1218 | * If the registration is not possible, we simply | |
1219 | * unregister the apps and continue | |
1220 | */ | |
56fff090 | 1221 | ust_app_unregister(ust_cmd.sock); |
5eb91c98 DG |
1222 | } else { |
1223 | /* | |
1224 | * We just need here to monitor the close of the UST | |
1225 | * socket and poll set monitor those by default. | |
a9ade966 MD |
1226 | * Listen on POLLIN (even if we never expect any |
1227 | * data) to ensure that hangup wakes us. | |
5eb91c98 | 1228 | */ |
a9ade966 | 1229 | ret = lttng_poll_add(&events, ust_cmd.sock, LPOLLIN); |
5eb91c98 DG |
1230 | if (ret < 0) { |
1231 | goto error; | |
1232 | } | |
1233 | ||
54d01ffb DG |
1234 | DBG("Apps with sock %d added to poll set", |
1235 | ust_cmd.sock); | |
5eb91c98 | 1236 | } |
487cf67c | 1237 | |
5eb91c98 | 1238 | break; |
0177d773 | 1239 | } |
5eb91c98 DG |
1240 | } else { |
1241 | /* | |
54d01ffb DG |
1242 | * At this point, we know that a registered application made |
1243 | * the event at poll_wait. | |
5eb91c98 DG |
1244 | */ |
1245 | if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { | |
1246 | /* Removing from the poll set */ | |
1247 | ret = lttng_poll_del(&events, pollfd); | |
1248 | if (ret < 0) { | |
1249 | goto error; | |
1250 | } | |
099e26bd | 1251 | |
b9d9b220 | 1252 | /* Socket closed on remote end. */ |
56fff090 | 1253 | ust_app_unregister(pollfd); |
5eb91c98 DG |
1254 | break; |
1255 | } | |
099e26bd DG |
1256 | } |
1257 | } | |
099e26bd DG |
1258 | } |
1259 | ||
1260 | error: | |
5eb91c98 | 1261 | lttng_poll_clean(&events); |
76d7553f MD |
1262 | error_poll_create: |
1263 | DBG("Application communication apps thread cleanup complete"); | |
f6a9efaa DG |
1264 | rcu_thread_offline(); |
1265 | rcu_unregister_thread(); | |
099e26bd DG |
1266 | return NULL; |
1267 | } | |
1268 | ||
1269 | /* | |
1270 | * Dispatch request from the registration threads to the application | |
1271 | * communication thread. | |
1272 | */ | |
1273 | static void *thread_dispatch_ust_registration(void *data) | |
1274 | { | |
1275 | int ret; | |
1276 | struct cds_wfq_node *node; | |
1277 | struct ust_command *ust_cmd = NULL; | |
1278 | ||
1279 | DBG("[thread] Dispatch UST command started"); | |
1280 | ||
1281 | while (!dispatch_thread_exit) { | |
1282 | /* Atomically prepare the queue futex */ | |
1283 | futex_nto1_prepare(&ust_cmd_queue.futex); | |
1284 | ||
1285 | do { | |
1286 | /* Dequeue command for registration */ | |
1287 | node = cds_wfq_dequeue_blocking(&ust_cmd_queue.queue); | |
1288 | if (node == NULL) { | |
00a17c97 | 1289 | DBG("Woken up but nothing in the UST command queue"); |
099e26bd DG |
1290 | /* Continue thread execution */ |
1291 | break; | |
1292 | } | |
1293 | ||
1294 | ust_cmd = caa_container_of(node, struct ust_command, node); | |
1295 | ||
2f50c8a3 DG |
1296 | DBG("Dispatching UST registration pid:%d ppid:%d uid:%d" |
1297 | " gid:%d sock:%d name:%s (version %d.%d)", | |
1298 | ust_cmd->reg_msg.pid, ust_cmd->reg_msg.ppid, | |
1299 | ust_cmd->reg_msg.uid, ust_cmd->reg_msg.gid, | |
1300 | ust_cmd->sock, ust_cmd->reg_msg.name, | |
1301 | ust_cmd->reg_msg.major, ust_cmd->reg_msg.minor); | |
099e26bd DG |
1302 | /* |
1303 | * Inform apps thread of the new application registration. This | |
1304 | * call is blocking so we can be assured that the data will be read | |
1305 | * at some point in time or wait to the end of the world :) | |
1306 | */ | |
1307 | ret = write(apps_cmd_pipe[1], ust_cmd, | |
1308 | sizeof(struct ust_command)); | |
1309 | if (ret < 0) { | |
76d7553f | 1310 | PERROR("write apps cmd pipe"); |
099e26bd DG |
1311 | if (errno == EBADF) { |
1312 | /* | |
1313 | * We can't inform the application thread to process | |
1314 | * registration. We will exit or else application | |
1315 | * registration will not occur and tracing will never | |
1316 | * start. | |
1317 | */ | |
1318 | goto error; | |
1319 | } | |
1320 | } | |
1321 | free(ust_cmd); | |
1322 | } while (node != NULL); | |
1323 | ||
1324 | /* Futex wait on queue. Blocking call on futex() */ | |
1325 | futex_nto1_wait(&ust_cmd_queue.futex); | |
1326 | } | |
1327 | ||
1328 | error: | |
1329 | DBG("Dispatch thread dying"); | |
1330 | return NULL; | |
1331 | } | |
1332 | ||
1333 | /* | |
1334 | * This thread manage application registration. | |
1335 | */ | |
1336 | static void *thread_registration_apps(void *data) | |
1d4b027a | 1337 | { |
a4b35e07 | 1338 | int sock = -1, i, ret, pollfd; |
5eb91c98 DG |
1339 | uint32_t revents, nb_fd; |
1340 | struct lttng_poll_event events; | |
099e26bd DG |
1341 | /* |
1342 | * Get allocated in this thread, enqueued to a global queue, dequeued and | |
1343 | * freed in the manage apps thread. | |
1344 | */ | |
1345 | struct ust_command *ust_cmd = NULL; | |
1d4b027a | 1346 | |
099e26bd | 1347 | DBG("[thread] Manage application registration started"); |
1d4b027a DG |
1348 | |
1349 | ret = lttcomm_listen_unix_sock(apps_sock); | |
1350 | if (ret < 0) { | |
76d7553f | 1351 | goto error_listen; |
1d4b027a DG |
1352 | } |
1353 | ||
5eb91c98 DG |
1354 | /* |
1355 | * Pass 2 as size here for the thread quit pipe and apps socket. Nothing | |
1356 | * more will be added to this poll set. | |
1357 | */ | |
1358 | ret = create_thread_poll_set(&events, 2); | |
1359 | if (ret < 0) { | |
76d7553f | 1360 | goto error_create_poll; |
5eb91c98 | 1361 | } |
273ea72c | 1362 | |
5eb91c98 DG |
1363 | /* Add the application registration socket */ |
1364 | ret = lttng_poll_add(&events, apps_sock, LPOLLIN | LPOLLRDHUP); | |
1365 | if (ret < 0) { | |
76d7553f | 1366 | goto error_poll_add; |
5eb91c98 | 1367 | } |
273ea72c | 1368 | |
1d4b027a | 1369 | /* Notify all applications to register */ |
0fdd1e2c DG |
1370 | ret = notify_ust_apps(1); |
1371 | if (ret < 0) { | |
1372 | ERR("Failed to notify applications or create the wait shared memory.\n" | |
54d01ffb DG |
1373 | "Execution continues but there might be problem for already\n" |
1374 | "running applications that wishes to register."); | |
0fdd1e2c | 1375 | } |
1d4b027a DG |
1376 | |
1377 | while (1) { | |
1378 | DBG("Accepting application registration"); | |
273ea72c | 1379 | |
5eb91c98 DG |
1380 | nb_fd = LTTNG_POLL_GETNB(&events); |
1381 | ||
273ea72c | 1382 | /* Inifinite blocking call, waiting for transmission */ |
88f2b785 | 1383 | restart: |
5eb91c98 | 1384 | ret = lttng_poll_wait(&events, -1); |
273ea72c | 1385 | if (ret < 0) { |
88f2b785 MD |
1386 | /* |
1387 | * Restart interrupted system call. | |
1388 | */ | |
1389 | if (errno == EINTR) { | |
1390 | goto restart; | |
1391 | } | |
273ea72c DG |
1392 | goto error; |
1393 | } | |
1394 | ||
5eb91c98 DG |
1395 | for (i = 0; i < nb_fd; i++) { |
1396 | /* Fetch once the poll data */ | |
1397 | revents = LTTNG_POLL_GETEV(&events, i); | |
1398 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
273ea72c | 1399 | |
5eb91c98 DG |
1400 | /* Thread quit pipe has been closed. Killing thread. */ |
1401 | ret = check_thread_quit_pipe(pollfd, revents); | |
1402 | if (ret) { | |
90014c57 DG |
1403 | goto error; |
1404 | } | |
1d4b027a | 1405 | |
5eb91c98 DG |
1406 | /* Event on the registration socket */ |
1407 | if (pollfd == apps_sock) { | |
1408 | if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { | |
1409 | ERR("Register apps socket poll error"); | |
1410 | goto error; | |
1411 | } else if (revents & LPOLLIN) { | |
1412 | sock = lttcomm_accept_unix_sock(apps_sock); | |
1413 | if (sock < 0) { | |
1414 | goto error; | |
1415 | } | |
099e26bd | 1416 | |
5eb91c98 | 1417 | /* Create UST registration command for enqueuing */ |
ba7f0ae5 | 1418 | ust_cmd = zmalloc(sizeof(struct ust_command)); |
5eb91c98 | 1419 | if (ust_cmd == NULL) { |
76d7553f | 1420 | PERROR("ust command zmalloc"); |
5eb91c98 DG |
1421 | goto error; |
1422 | } | |
1d4b027a | 1423 | |
5eb91c98 DG |
1424 | /* |
1425 | * Using message-based transmissions to ensure we don't | |
1426 | * have to deal with partially received messages. | |
1427 | */ | |
4063050c MD |
1428 | ret = lttng_fd_get(LTTNG_FD_APPS, 1); |
1429 | if (ret < 0) { | |
1430 | ERR("Exhausted file descriptors allowed for applications."); | |
1431 | free(ust_cmd); | |
1432 | ret = close(sock); | |
1433 | if (ret) { | |
1434 | PERROR("close"); | |
1435 | } | |
1436 | sock = -1; | |
1437 | continue; | |
1438 | } | |
5eb91c98 DG |
1439 | ret = lttcomm_recv_unix_sock(sock, &ust_cmd->reg_msg, |
1440 | sizeof(struct ust_register_msg)); | |
1441 | if (ret < 0 || ret < sizeof(struct ust_register_msg)) { | |
1442 | if (ret < 0) { | |
76d7553f | 1443 | PERROR("lttcomm_recv_unix_sock register apps"); |
5eb91c98 DG |
1444 | } else { |
1445 | ERR("Wrong size received on apps register"); | |
1446 | } | |
1447 | free(ust_cmd); | |
76d7553f MD |
1448 | ret = close(sock); |
1449 | if (ret) { | |
1450 | PERROR("close"); | |
1451 | } | |
4063050c | 1452 | lttng_fd_put(LTTNG_FD_APPS, 1); |
76d7553f | 1453 | sock = -1; |
5eb91c98 DG |
1454 | continue; |
1455 | } | |
099e26bd | 1456 | |
5eb91c98 | 1457 | ust_cmd->sock = sock; |
34a2494f | 1458 | sock = -1; |
099e26bd | 1459 | |
5eb91c98 DG |
1460 | DBG("UST registration received with pid:%d ppid:%d uid:%d" |
1461 | " gid:%d sock:%d name:%s (version %d.%d)", | |
1462 | ust_cmd->reg_msg.pid, ust_cmd->reg_msg.ppid, | |
1463 | ust_cmd->reg_msg.uid, ust_cmd->reg_msg.gid, | |
1464 | ust_cmd->sock, ust_cmd->reg_msg.name, | |
1465 | ust_cmd->reg_msg.major, ust_cmd->reg_msg.minor); | |
54d01ffb | 1466 | |
5eb91c98 DG |
1467 | /* |
1468 | * Lock free enqueue the registration request. The red pill | |
54d01ffb | 1469 | * has been taken! This apps will be part of the *system*. |
5eb91c98 DG |
1470 | */ |
1471 | cds_wfq_enqueue(&ust_cmd_queue.queue, &ust_cmd->node); | |
1472 | ||
1473 | /* | |
1474 | * Wake the registration queue futex. Implicit memory | |
1475 | * barrier with the exchange in cds_wfq_enqueue. | |
1476 | */ | |
1477 | futex_nto1_wake(&ust_cmd_queue.futex); | |
1478 | } | |
1479 | } | |
90014c57 | 1480 | } |
1d4b027a DG |
1481 | } |
1482 | ||
1483 | error: | |
0fdd1e2c DG |
1484 | /* Notify that the registration thread is gone */ |
1485 | notify_ust_apps(0); | |
1486 | ||
a4b35e07 | 1487 | if (apps_sock >= 0) { |
76d7553f MD |
1488 | ret = close(apps_sock); |
1489 | if (ret) { | |
1490 | PERROR("close"); | |
1491 | } | |
a4b35e07 | 1492 | } |
46c3f085 | 1493 | if (sock >= 0) { |
76d7553f MD |
1494 | ret = close(sock); |
1495 | if (ret) { | |
1496 | PERROR("close"); | |
1497 | } | |
4063050c | 1498 | lttng_fd_put(LTTNG_FD_APPS, 1); |
a4b35e07 | 1499 | } |
273ea72c | 1500 | unlink(apps_unix_sock_path); |
0fdd1e2c | 1501 | |
76d7553f | 1502 | error_poll_add: |
5eb91c98 | 1503 | lttng_poll_clean(&events); |
76d7553f MD |
1504 | error_listen: |
1505 | error_create_poll: | |
1506 | DBG("UST Registration thread cleanup complete"); | |
5eb91c98 | 1507 | |
1d4b027a DG |
1508 | return NULL; |
1509 | } | |
1510 | ||
8c0faa1d | 1511 | /* |
3bd1e081 | 1512 | * Start the thread_manage_consumer. This must be done after a lttng-consumerd |
d063d709 | 1513 | * exec or it will fails. |
8c0faa1d | 1514 | */ |
3bd1e081 | 1515 | static int spawn_consumer_thread(struct consumer_data *consumer_data) |
8c0faa1d DG |
1516 | { |
1517 | int ret; | |
ee0b0061 DG |
1518 | struct timespec timeout; |
1519 | ||
1520 | timeout.tv_sec = DEFAULT_SEM_WAIT_TIMEOUT; | |
1521 | timeout.tv_nsec = 0; | |
8c0faa1d DG |
1522 | |
1523 | /* Setup semaphore */ | |
3bd1e081 | 1524 | ret = sem_init(&consumer_data->sem, 0, 0); |
ee0b0061 | 1525 | if (ret < 0) { |
3bd1e081 | 1526 | PERROR("sem_init consumer semaphore"); |
ee0b0061 DG |
1527 | goto error; |
1528 | } | |
8c0faa1d | 1529 | |
3bd1e081 MD |
1530 | ret = pthread_create(&consumer_data->thread, NULL, |
1531 | thread_manage_consumer, consumer_data); | |
8c0faa1d | 1532 | if (ret != 0) { |
3bd1e081 | 1533 | PERROR("pthread_create consumer"); |
ee0b0061 | 1534 | ret = -1; |
8c0faa1d DG |
1535 | goto error; |
1536 | } | |
1537 | ||
ee0b0061 DG |
1538 | /* Get time for sem_timedwait absolute timeout */ |
1539 | ret = clock_gettime(CLOCK_REALTIME, &timeout); | |
1540 | if (ret < 0) { | |
3bd1e081 | 1541 | PERROR("clock_gettime spawn consumer"); |
ee0b0061 | 1542 | /* Infinite wait for the kconsumerd thread to be ready */ |
3bd1e081 | 1543 | ret = sem_wait(&consumer_data->sem); |
ee0b0061 DG |
1544 | } else { |
1545 | /* Normal timeout if the gettime was successful */ | |
1546 | timeout.tv_sec += DEFAULT_SEM_WAIT_TIMEOUT; | |
3bd1e081 | 1547 | ret = sem_timedwait(&consumer_data->sem, &timeout); |
ee0b0061 | 1548 | } |
8c0faa1d | 1549 | |
ee0b0061 DG |
1550 | if (ret < 0) { |
1551 | if (errno == ETIMEDOUT) { | |
1552 | /* | |
1553 | * Call has timed out so we kill the kconsumerd_thread and return | |
1554 | * an error. | |
1555 | */ | |
3bd1e081 MD |
1556 | ERR("The consumer thread was never ready. Killing it"); |
1557 | ret = pthread_cancel(consumer_data->thread); | |
ee0b0061 | 1558 | if (ret < 0) { |
3bd1e081 | 1559 | PERROR("pthread_cancel consumer thread"); |
ee0b0061 DG |
1560 | } |
1561 | } else { | |
3bd1e081 | 1562 | PERROR("semaphore wait failed consumer thread"); |
ee0b0061 DG |
1563 | } |
1564 | goto error; | |
1565 | } | |
1566 | ||
3bd1e081 MD |
1567 | pthread_mutex_lock(&consumer_data->pid_mutex); |
1568 | if (consumer_data->pid == 0) { | |
712ea556 | 1569 | ERR("Kconsumerd did not start"); |
3bd1e081 | 1570 | pthread_mutex_unlock(&consumer_data->pid_mutex); |
712ea556 DG |
1571 | goto error; |
1572 | } | |
3bd1e081 | 1573 | pthread_mutex_unlock(&consumer_data->pid_mutex); |
712ea556 | 1574 | |
8c0faa1d DG |
1575 | return 0; |
1576 | ||
1577 | error: | |
1578 | return ret; | |
1579 | } | |
1580 | ||
d9800920 | 1581 | /* |
3bd1e081 | 1582 | * Join consumer thread |
d9800920 | 1583 | */ |
3bd1e081 | 1584 | static int join_consumer_thread(struct consumer_data *consumer_data) |
cf3af59e MD |
1585 | { |
1586 | void *status; | |
1587 | int ret; | |
1588 | ||
3bd1e081 MD |
1589 | if (consumer_data->pid != 0) { |
1590 | ret = kill(consumer_data->pid, SIGTERM); | |
cf3af59e | 1591 | if (ret) { |
3bd1e081 | 1592 | ERR("Error killing consumer daemon"); |
cf3af59e MD |
1593 | return ret; |
1594 | } | |
3bd1e081 | 1595 | return pthread_join(consumer_data->thread, &status); |
cf3af59e MD |
1596 | } else { |
1597 | return 0; | |
1598 | } | |
1599 | } | |
1600 | ||
8c0faa1d | 1601 | /* |
3bd1e081 | 1602 | * Fork and exec a consumer daemon (consumerd). |
8c0faa1d | 1603 | * |
d063d709 | 1604 | * Return pid if successful else -1. |
8c0faa1d | 1605 | */ |
3bd1e081 | 1606 | static pid_t spawn_consumerd(struct consumer_data *consumer_data) |
8c0faa1d DG |
1607 | { |
1608 | int ret; | |
1609 | pid_t pid; | |
94c55f17 | 1610 | const char *consumer_to_use; |
53086306 | 1611 | const char *verbosity; |
94c55f17 | 1612 | struct stat st; |
8c0faa1d | 1613 | |
3bd1e081 | 1614 | DBG("Spawning consumerd"); |
c49dc785 | 1615 | |
8c0faa1d DG |
1616 | pid = fork(); |
1617 | if (pid == 0) { | |
1618 | /* | |
3bd1e081 | 1619 | * Exec consumerd. |
8c0faa1d | 1620 | */ |
daee5345 | 1621 | if (opt_verbose_consumer) { |
53086306 DG |
1622 | verbosity = "--verbose"; |
1623 | } else { | |
1624 | verbosity = "--quiet"; | |
1625 | } | |
3bd1e081 MD |
1626 | switch (consumer_data->type) { |
1627 | case LTTNG_CONSUMER_KERNEL: | |
94c55f17 | 1628 | /* |
c7704d57 DG |
1629 | * Find out which consumerd to execute. We will first try the |
1630 | * 64-bit path, then the sessiond's installation directory, and | |
1631 | * fallback on the 32-bit one, | |
94c55f17 | 1632 | */ |
63a799e8 AM |
1633 | DBG3("Looking for a kernel consumer at these locations:"); |
1634 | DBG3(" 1) %s", consumerd64_bin); | |
1635 | DBG3(" 2) %s/%s", INSTALL_BIN_PATH, CONSUMERD_FILE); | |
1636 | DBG3(" 3) %s", consumerd32_bin); | |
94c55f17 | 1637 | if (stat(consumerd64_bin, &st) == 0) { |
63a799e8 | 1638 | DBG3("Found location #1"); |
94c55f17 | 1639 | consumer_to_use = consumerd64_bin; |
94c55f17 | 1640 | } else if (stat(INSTALL_BIN_PATH "/" CONSUMERD_FILE, &st) == 0) { |
63a799e8 | 1641 | DBG3("Found location #2"); |
94c55f17 | 1642 | consumer_to_use = INSTALL_BIN_PATH "/" CONSUMERD_FILE; |
eb1e0bd4 | 1643 | } else if (stat(consumerd32_bin, &st) == 0) { |
63a799e8 | 1644 | DBG3("Found location #3"); |
eb1e0bd4 | 1645 | consumer_to_use = consumerd32_bin; |
94c55f17 | 1646 | } else { |
63a799e8 | 1647 | DBG("Could not find any valid consumerd executable"); |
94c55f17 AM |
1648 | break; |
1649 | } | |
1650 | DBG("Using kernel consumer at: %s", consumer_to_use); | |
1651 | execl(consumer_to_use, | |
1652 | "lttng-consumerd", verbosity, "-k", | |
1653 | "--consumerd-cmd-sock", consumer_data->cmd_unix_sock_path, | |
1654 | "--consumerd-err-sock", consumer_data->err_unix_sock_path, | |
1655 | NULL); | |
3bd1e081 | 1656 | break; |
7753dea8 MD |
1657 | case LTTNG_CONSUMER64_UST: |
1658 | { | |
b1e0b6b6 | 1659 | char *tmpnew = NULL; |
8f4905da MD |
1660 | |
1661 | if (consumerd64_libdir[0] != '\0') { | |
1662 | char *tmp; | |
1663 | size_t tmplen; | |
1664 | ||
1665 | tmp = getenv("LD_LIBRARY_PATH"); | |
1666 | if (!tmp) { | |
1667 | tmp = ""; | |
1668 | } | |
1669 | tmplen = strlen("LD_LIBRARY_PATH=") | |
1670 | + strlen(consumerd64_libdir) + 1 /* : */ + strlen(tmp); | |
1671 | tmpnew = zmalloc(tmplen + 1 /* \0 */); | |
1672 | if (!tmpnew) { | |
1673 | ret = -ENOMEM; | |
1674 | goto error; | |
1675 | } | |
1676 | strcpy(tmpnew, "LD_LIBRARY_PATH="); | |
1677 | strcat(tmpnew, consumerd64_libdir); | |
1678 | if (tmp[0] != '\0') { | |
1679 | strcat(tmpnew, ":"); | |
1680 | strcat(tmpnew, tmp); | |
1681 | } | |
1682 | ret = putenv(tmpnew); | |
1683 | if (ret) { | |
1684 | ret = -errno; | |
1685 | goto error; | |
1686 | } | |
1687 | } | |
94c55f17 | 1688 | DBG("Using 64-bit UST consumer at: %s", consumerd64_bin); |
a5a6aff3 | 1689 | ret = execl(consumerd64_bin, "lttng-consumerd", verbosity, "-u", |
7753dea8 MD |
1690 | "--consumerd-cmd-sock", consumer_data->cmd_unix_sock_path, |
1691 | "--consumerd-err-sock", consumer_data->err_unix_sock_path, | |
1692 | NULL); | |
8f4905da MD |
1693 | if (consumerd64_libdir[0] != '\0') { |
1694 | free(tmpnew); | |
1695 | } | |
1696 | if (ret) { | |
1697 | goto error; | |
1698 | } | |
3bd1e081 | 1699 | break; |
7753dea8 MD |
1700 | } |
1701 | case LTTNG_CONSUMER32_UST: | |
1702 | { | |
937dde8e | 1703 | char *tmpnew = NULL; |
8f4905da MD |
1704 | |
1705 | if (consumerd32_libdir[0] != '\0') { | |
1706 | char *tmp; | |
1707 | size_t tmplen; | |
1708 | ||
1709 | tmp = getenv("LD_LIBRARY_PATH"); | |
1710 | if (!tmp) { | |
1711 | tmp = ""; | |
1712 | } | |
1713 | tmplen = strlen("LD_LIBRARY_PATH=") | |
1714 | + strlen(consumerd32_libdir) + 1 /* : */ + strlen(tmp); | |
1715 | tmpnew = zmalloc(tmplen + 1 /* \0 */); | |
1716 | if (!tmpnew) { | |
1717 | ret = -ENOMEM; | |
1718 | goto error; | |
1719 | } | |
1720 | strcpy(tmpnew, "LD_LIBRARY_PATH="); | |
1721 | strcat(tmpnew, consumerd32_libdir); | |
1722 | if (tmp[0] != '\0') { | |
1723 | strcat(tmpnew, ":"); | |
1724 | strcat(tmpnew, tmp); | |
1725 | } | |
1726 | ret = putenv(tmpnew); | |
1727 | if (ret) { | |
1728 | ret = -errno; | |
1729 | goto error; | |
1730 | } | |
1731 | } | |
94c55f17 | 1732 | DBG("Using 32-bit UST consumer at: %s", consumerd32_bin); |
a5a6aff3 | 1733 | ret = execl(consumerd32_bin, "lttng-consumerd", verbosity, "-u", |
7753dea8 MD |
1734 | "--consumerd-cmd-sock", consumer_data->cmd_unix_sock_path, |
1735 | "--consumerd-err-sock", consumer_data->err_unix_sock_path, | |
1736 | NULL); | |
8f4905da MD |
1737 | if (consumerd32_libdir[0] != '\0') { |
1738 | free(tmpnew); | |
1739 | } | |
1740 | if (ret) { | |
1741 | goto error; | |
1742 | } | |
7753dea8 MD |
1743 | break; |
1744 | } | |
3bd1e081 | 1745 | default: |
76d7553f | 1746 | PERROR("unknown consumer type"); |
3bd1e081 MD |
1747 | exit(EXIT_FAILURE); |
1748 | } | |
8c0faa1d | 1749 | if (errno != 0) { |
76d7553f | 1750 | PERROR("kernel start consumer exec"); |
8c0faa1d DG |
1751 | } |
1752 | exit(EXIT_FAILURE); | |
1753 | } else if (pid > 0) { | |
1754 | ret = pid; | |
8c0faa1d | 1755 | } else { |
76d7553f | 1756 | PERROR("start consumer fork"); |
8c0faa1d | 1757 | ret = -errno; |
8c0faa1d | 1758 | } |
8f4905da | 1759 | error: |
8c0faa1d DG |
1760 | return ret; |
1761 | } | |
1762 | ||
693bd40b | 1763 | /* |
3bd1e081 | 1764 | * Spawn the consumerd daemon and session daemon thread. |
693bd40b | 1765 | */ |
3bd1e081 | 1766 | static int start_consumerd(struct consumer_data *consumer_data) |
693bd40b DG |
1767 | { |
1768 | int ret; | |
1769 | ||
3bd1e081 MD |
1770 | pthread_mutex_lock(&consumer_data->pid_mutex); |
1771 | if (consumer_data->pid != 0) { | |
1772 | pthread_mutex_unlock(&consumer_data->pid_mutex); | |
c49dc785 DG |
1773 | goto end; |
1774 | } | |
693bd40b | 1775 | |
3bd1e081 | 1776 | ret = spawn_consumerd(consumer_data); |
c49dc785 | 1777 | if (ret < 0) { |
3bd1e081 MD |
1778 | ERR("Spawning consumerd failed"); |
1779 | pthread_mutex_unlock(&consumer_data->pid_mutex); | |
c49dc785 | 1780 | goto error; |
693bd40b | 1781 | } |
c49dc785 | 1782 | |
3bd1e081 MD |
1783 | /* Setting up the consumer_data pid */ |
1784 | consumer_data->pid = ret; | |
48842b30 | 1785 | DBG2("Consumer pid %d", consumer_data->pid); |
3bd1e081 | 1786 | pthread_mutex_unlock(&consumer_data->pid_mutex); |
693bd40b | 1787 | |
3bd1e081 MD |
1788 | DBG2("Spawning consumer control thread"); |
1789 | ret = spawn_consumer_thread(consumer_data); | |
693bd40b | 1790 | if (ret < 0) { |
3bd1e081 | 1791 | ERR("Fatal error spawning consumer control thread"); |
693bd40b DG |
1792 | goto error; |
1793 | } | |
1794 | ||
c49dc785 | 1795 | end: |
693bd40b DG |
1796 | return 0; |
1797 | ||
1798 | error: | |
1799 | return ret; | |
1800 | } | |
1801 | ||
b73401da | 1802 | /* |
096102bd | 1803 | * Check version of the lttng-modules. |
b73401da | 1804 | */ |
096102bd | 1805 | static int validate_lttng_modules_version(void) |
b73401da | 1806 | { |
096102bd | 1807 | return kernel_validate_version(kernel_tracer_fd); |
ab147185 MD |
1808 | } |
1809 | ||
b73401da | 1810 | /* |
096102bd | 1811 | * Setup necessary data for kernel tracer action. |
b73401da | 1812 | */ |
096102bd | 1813 | static int init_kernel_tracer(void) |
b73401da DG |
1814 | { |
1815 | int ret; | |
b73401da | 1816 | |
096102bd DG |
1817 | /* Modprobe lttng kernel modules */ |
1818 | ret = modprobe_lttng_control(); | |
b73401da | 1819 | if (ret < 0) { |
b73401da DG |
1820 | goto error; |
1821 | } | |
1822 | ||
096102bd DG |
1823 | /* Open debugfs lttng */ |
1824 | kernel_tracer_fd = open(module_proc_lttng, O_RDWR); | |
1825 | if (kernel_tracer_fd < 0) { | |
1826 | DBG("Failed to open %s", module_proc_lttng); | |
1827 | ret = -1; | |
1828 | goto error_open; | |
b73401da DG |
1829 | } |
1830 | ||
096102bd DG |
1831 | /* Validate kernel version */ |
1832 | ret = validate_lttng_modules_version(); | |
b73401da | 1833 | if (ret < 0) { |
096102bd | 1834 | goto error_version; |
b73401da DG |
1835 | } |
1836 | ||
096102bd | 1837 | ret = modprobe_lttng_data(); |
b73401da | 1838 | if (ret < 0) { |
096102bd | 1839 | goto error_modules; |
8c0faa1d DG |
1840 | } |
1841 | ||
f3ed775e | 1842 | DBG("Kernel tracer fd %d", kernel_tracer_fd); |
096102bd DG |
1843 | return 0; |
1844 | ||
1845 | error_version: | |
1846 | modprobe_remove_lttng_control(); | |
76d7553f MD |
1847 | ret = close(kernel_tracer_fd); |
1848 | if (ret) { | |
1849 | PERROR("close"); | |
1850 | } | |
1851 | kernel_tracer_fd = -1; | |
096102bd DG |
1852 | return LTTCOMM_KERN_VERSION; |
1853 | ||
1854 | error_modules: | |
76d7553f MD |
1855 | ret = close(kernel_tracer_fd); |
1856 | if (ret) { | |
1857 | PERROR("close"); | |
1858 | } | |
096102bd DG |
1859 | |
1860 | error_open: | |
1861 | modprobe_remove_lttng_control(); | |
b73401da DG |
1862 | |
1863 | error: | |
b73401da | 1864 | WARN("No kernel tracer available"); |
a4b35e07 | 1865 | kernel_tracer_fd = -1; |
531d29f9 MD |
1866 | if (!is_root) { |
1867 | return LTTCOMM_NEED_ROOT_SESSIOND; | |
1868 | } else { | |
1869 | return LTTCOMM_KERN_NA; | |
1870 | } | |
f3ed775e | 1871 | } |
33a2b854 | 1872 | |
f3ed775e | 1873 | /* |
54d01ffb | 1874 | * Init tracing by creating trace directory and sending fds kernel consumer. |
f3ed775e | 1875 | */ |
54d01ffb | 1876 | static int init_kernel_tracing(struct ltt_kernel_session *session) |
f3ed775e | 1877 | { |
f40799e8 | 1878 | int ret = 0; |
8c0faa1d | 1879 | |
3bd1e081 | 1880 | if (session->consumer_fds_sent == 0) { |
d9800920 | 1881 | /* |
54d01ffb | 1882 | * Assign default kernel consumer socket if no consumer assigned to the |
03550b58 | 1883 | * kernel session. At this point, it's NOT supposed to be -1 but this is |
54d01ffb | 1884 | * an extra security check. |
d9800920 | 1885 | */ |
03550b58 | 1886 | if (session->consumer_fd < 0) { |
3bd1e081 | 1887 | session->consumer_fd = kconsumer_data.cmd_sock; |
d9800920 DG |
1888 | } |
1889 | ||
2bdd86d4 | 1890 | ret = send_kconsumer_session_streams(&kconsumer_data, session); |
f3ed775e | 1891 | if (ret < 0) { |
f3ed775e DG |
1892 | ret = LTTCOMM_KERN_CONSUMER_FAIL; |
1893 | goto error; | |
1894 | } | |
1d4b027a | 1895 | |
3bd1e081 | 1896 | session->consumer_fds_sent = 1; |
f3ed775e | 1897 | } |
1d4b027a DG |
1898 | |
1899 | error: | |
1900 | return ret; | |
8c0faa1d DG |
1901 | } |
1902 | ||
0177d773 DG |
1903 | /* |
1904 | * Create an UST session and add it to the session ust list. | |
1905 | */ | |
44d3bd01 | 1906 | static int create_ust_session(struct ltt_session *session, |
6df2e2c9 | 1907 | struct lttng_domain *domain) |
0177d773 | 1908 | { |
13384287 | 1909 | struct ltt_ust_session *lus = NULL; |
6df2e2c9 | 1910 | int ret; |
44d3bd01 DG |
1911 | |
1912 | switch (domain->type) { | |
48842b30 | 1913 | case LTTNG_DOMAIN_UST: |
44d3bd01 DG |
1914 | break; |
1915 | default: | |
13384287 | 1916 | ret = LTTCOMM_UNKNOWN_DOMAIN; |
44d3bd01 DG |
1917 | goto error; |
1918 | } | |
0177d773 DG |
1919 | |
1920 | DBG("Creating UST session"); | |
1921 | ||
a991f516 | 1922 | lus = trace_ust_create_session(session->path, session->id, domain); |
0177d773 | 1923 | if (lus == NULL) { |
44d3bd01 | 1924 | ret = LTTCOMM_UST_SESS_FAIL; |
0177d773 DG |
1925 | goto error; |
1926 | } | |
1927 | ||
e11d277b | 1928 | ret = run_as_mkdir_recursive(lus->pathname, S_IRWXU | S_IRWXG, |
6df2e2c9 | 1929 | session->uid, session->gid); |
0177d773 DG |
1930 | if (ret < 0) { |
1931 | if (ret != -EEXIST) { | |
1932 | ERR("Trace directory creation error"); | |
44d3bd01 | 1933 | ret = LTTCOMM_UST_SESS_FAIL; |
0177d773 DG |
1934 | goto error; |
1935 | } | |
1936 | } | |
1937 | ||
f6a9efaa DG |
1938 | /* The domain type dictate different actions on session creation */ |
1939 | switch (domain->type) { | |
48842b30 DG |
1940 | case LTTNG_DOMAIN_UST: |
1941 | /* No ustctl for the global UST domain */ | |
1942 | break; | |
1943 | default: | |
36dc12cc | 1944 | ERR("Unknown UST domain on create session %d", domain->type); |
48842b30 | 1945 | goto error; |
0177d773 | 1946 | } |
6df2e2c9 MD |
1947 | lus->uid = session->uid; |
1948 | lus->gid = session->gid; | |
f6a9efaa | 1949 | session->ust_session = lus; |
44d3bd01 DG |
1950 | |
1951 | return LTTCOMM_OK; | |
0177d773 DG |
1952 | |
1953 | error: | |
1954 | free(lus); | |
1955 | return ret; | |
1956 | } | |
1957 | ||
333f285e | 1958 | /* |
d063d709 | 1959 | * Create a kernel tracer session then create the default channel. |
333f285e | 1960 | */ |
6df2e2c9 | 1961 | static int create_kernel_session(struct ltt_session *session) |
333f285e | 1962 | { |
f3ed775e | 1963 | int ret; |
f3ed775e DG |
1964 | |
1965 | DBG("Creating kernel session"); | |
1966 | ||
1967 | ret = kernel_create_session(session, kernel_tracer_fd); | |
1968 | if (ret < 0) { | |
1969 | ret = LTTCOMM_KERN_SESS_FAIL; | |
1970 | goto error; | |
333f285e DG |
1971 | } |
1972 | ||
d9800920 | 1973 | /* Set kernel consumer socket fd */ |
03550b58 | 1974 | if (kconsumer_data.cmd_sock >= 0) { |
3bd1e081 | 1975 | session->kernel_session->consumer_fd = kconsumer_data.cmd_sock; |
d9800920 DG |
1976 | } |
1977 | ||
e11d277b | 1978 | ret = run_as_mkdir_recursive(session->kernel_session->trace_path, |
6df2e2c9 | 1979 | S_IRWXU | S_IRWXG, session->uid, session->gid); |
7a485870 | 1980 | if (ret < 0) { |
996b65c8 | 1981 | if (ret != -EEXIST) { |
7a485870 DG |
1982 | ERR("Trace directory creation error"); |
1983 | goto error; | |
1984 | } | |
1985 | } | |
6df2e2c9 MD |
1986 | session->kernel_session->uid = session->uid; |
1987 | session->kernel_session->gid = session->gid; | |
7a485870 | 1988 | |
f3ed775e DG |
1989 | error: |
1990 | return ret; | |
333f285e DG |
1991 | } |
1992 | ||
8e0af1b4 | 1993 | /* |
c7704d57 DG |
1994 | * Check if the UID or GID match the session. Root user has access to all |
1995 | * sessions. | |
8e0af1b4 | 1996 | */ |
c7704d57 | 1997 | static int session_access_ok(struct ltt_session *session, uid_t uid, gid_t gid) |
8e0af1b4 | 1998 | { |
c7704d57 | 1999 | if (uid != session->uid && gid != session->gid && uid != 0) { |
8e0af1b4 MD |
2000 | return 0; |
2001 | } else { | |
2002 | return 1; | |
2003 | } | |
2004 | } | |
2005 | ||
2006 | static unsigned int lttng_sessions_count(uid_t uid, gid_t gid) | |
2007 | { | |
2008 | unsigned int i = 0; | |
2009 | struct ltt_session *session; | |
2010 | ||
2011 | DBG("Counting number of available session for UID %d GID %d", | |
2012 | uid, gid); | |
2013 | cds_list_for_each_entry(session, &session_list_ptr->head, list) { | |
2014 | /* | |
2015 | * Only list the sessions the user can control. | |
2016 | */ | |
2017 | if (!session_access_ok(session, uid, gid)) { | |
2018 | continue; | |
2019 | } | |
2020 | i++; | |
2021 | } | |
2022 | return i; | |
2023 | } | |
2024 | ||
6c9cc2ab DG |
2025 | /* |
2026 | * Using the session list, filled a lttng_session array to send back to the | |
2027 | * client for session listing. | |
2028 | * | |
2029 | * The session list lock MUST be acquired before calling this function. Use | |
54d01ffb | 2030 | * session_lock_list() and session_unlock_list(). |
6c9cc2ab | 2031 | */ |
c7704d57 DG |
2032 | static void list_lttng_sessions(struct lttng_session *sessions, uid_t uid, |
2033 | gid_t gid) | |
6c9cc2ab | 2034 | { |
8e0af1b4 | 2035 | unsigned int i = 0; |
6c9cc2ab DG |
2036 | struct ltt_session *session; |
2037 | ||
8e0af1b4 MD |
2038 | DBG("Getting all available session for UID %d GID %d", |
2039 | uid, gid); | |
6c9cc2ab DG |
2040 | /* |
2041 | * Iterate over session list and append data after the control struct in | |
2042 | * the buffer. | |
2043 | */ | |
2044 | cds_list_for_each_entry(session, &session_list_ptr->head, list) { | |
8e0af1b4 MD |
2045 | /* |
2046 | * Only list the sessions the user can control. | |
2047 | */ | |
2048 | if (!session_access_ok(session, uid, gid)) { | |
2049 | continue; | |
2050 | } | |
6c9cc2ab | 2051 | strncpy(sessions[i].path, session->path, PATH_MAX); |
99497cd0 | 2052 | sessions[i].path[PATH_MAX - 1] = '\0'; |
6c9cc2ab | 2053 | strncpy(sessions[i].name, session->name, NAME_MAX); |
99497cd0 | 2054 | sessions[i].name[NAME_MAX - 1] = '\0'; |
464dd62d | 2055 | sessions[i].enabled = session->enabled; |
6c9cc2ab DG |
2056 | i++; |
2057 | } | |
2058 | } | |
2059 | ||
9f19cc17 DG |
2060 | /* |
2061 | * Fill lttng_channel array of all channels. | |
2062 | */ | |
b551a063 | 2063 | static void list_lttng_channels(int domain, struct ltt_session *session, |
9f19cc17 DG |
2064 | struct lttng_channel *channels) |
2065 | { | |
2066 | int i = 0; | |
2067 | struct ltt_kernel_channel *kchan; | |
2068 | ||
2069 | DBG("Listing channels for session %s", session->name); | |
2070 | ||
b551a063 DG |
2071 | switch (domain) { |
2072 | case LTTNG_DOMAIN_KERNEL: | |
2073 | /* Kernel channels */ | |
2074 | if (session->kernel_session != NULL) { | |
2075 | cds_list_for_each_entry(kchan, | |
2076 | &session->kernel_session->channel_list.head, list) { | |
2077 | /* Copy lttng_channel struct to array */ | |
2078 | memcpy(&channels[i], kchan->channel, sizeof(struct lttng_channel)); | |
2079 | channels[i].enabled = kchan->enabled; | |
2080 | i++; | |
2081 | } | |
2082 | } | |
2083 | break; | |
2084 | case LTTNG_DOMAIN_UST: | |
2085 | { | |
bec39940 | 2086 | struct lttng_ht_iter iter; |
b551a063 DG |
2087 | struct ltt_ust_channel *uchan; |
2088 | ||
bec39940 DG |
2089 | cds_lfht_for_each_entry(session->ust_session->domain_global.channels->ht, |
2090 | &iter.iter, uchan, node.node) { | |
b551a063 DG |
2091 | strncpy(channels[i].name, uchan->name, LTTNG_SYMBOL_NAME_LEN); |
2092 | channels[i].attr.overwrite = uchan->attr.overwrite; | |
2093 | channels[i].attr.subbuf_size = uchan->attr.subbuf_size; | |
2094 | channels[i].attr.num_subbuf = uchan->attr.num_subbuf; | |
2095 | channels[i].attr.switch_timer_interval = | |
2096 | uchan->attr.switch_timer_interval; | |
2097 | channels[i].attr.read_timer_interval = | |
2098 | uchan->attr.read_timer_interval; | |
aea829b3 | 2099 | channels[i].enabled = uchan->enabled; |
5edd7e09 DG |
2100 | switch (uchan->attr.output) { |
2101 | case LTTNG_UST_MMAP: | |
2102 | default: | |
2103 | channels[i].attr.output = LTTNG_EVENT_MMAP; | |
2104 | break; | |
2105 | } | |
befe0905 | 2106 | i++; |
b551a063 DG |
2107 | } |
2108 | break; | |
2109 | } | |
2110 | default: | |
2111 | break; | |
2112 | } | |
2113 | } | |
2114 | ||
2115 | /* | |
2116 | * Create a list of ust global domain events. | |
2117 | */ | |
2118 | static int list_lttng_ust_global_events(char *channel_name, | |
2119 | struct ltt_ust_domain_global *ust_global, struct lttng_event **events) | |
2120 | { | |
2121 | int i = 0, ret = 0; | |
2122 | unsigned int nb_event = 0; | |
bec39940 DG |
2123 | struct lttng_ht_iter iter; |
2124 | struct lttng_ht_node_str *node; | |
b551a063 DG |
2125 | struct ltt_ust_channel *uchan; |
2126 | struct ltt_ust_event *uevent; | |
2127 | struct lttng_event *tmp; | |
2128 | ||
2129 | DBG("Listing UST global events for channel %s", channel_name); | |
2130 | ||
2131 | rcu_read_lock(); | |
2132 | ||
bec39940 DG |
2133 | lttng_ht_lookup(ust_global->channels, (void *)channel_name, &iter); |
2134 | node = lttng_ht_iter_get_node_str(&iter); | |
d7b75b30 DG |
2135 | if (node == NULL) { |
2136 | ret = -LTTCOMM_UST_CHAN_NOT_FOUND; | |
2137 | goto error; | |
b551a063 DG |
2138 | } |
2139 | ||
bec39940 | 2140 | uchan = caa_container_of(&node->node, struct ltt_ust_channel, node.node); |
d7b75b30 | 2141 | |
bec39940 | 2142 | nb_event += lttng_ht_get_count(uchan->events); |
d7b75b30 | 2143 | |
b551a063 DG |
2144 | if (nb_event == 0) { |
2145 | ret = nb_event; | |
2146 | goto error; | |
2147 | } | |
2148 | ||
2149 | DBG3("Listing UST global %d events", nb_event); | |
2150 | ||
2151 | tmp = zmalloc(nb_event * sizeof(struct lttng_event)); | |
2152 | if (tmp == NULL) { | |
2153 | ret = -LTTCOMM_FATAL; | |
2154 | goto error; | |
2155 | } | |
2156 | ||
bec39940 | 2157 | cds_lfht_for_each_entry(uchan->events->ht, &iter.iter, uevent, node.node) { |
d7b75b30 DG |
2158 | strncpy(tmp[i].name, uevent->attr.name, LTTNG_SYMBOL_NAME_LEN); |
2159 | tmp[i].name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0'; | |
2160 | tmp[i].enabled = uevent->enabled; | |
2161 | switch (uevent->attr.instrumentation) { | |
2162 | case LTTNG_UST_TRACEPOINT: | |
2163 | tmp[i].type = LTTNG_EVENT_TRACEPOINT; | |
2164 | break; | |
2165 | case LTTNG_UST_PROBE: | |
2166 | tmp[i].type = LTTNG_EVENT_PROBE; | |
2167 | break; | |
2168 | case LTTNG_UST_FUNCTION: | |
2169 | tmp[i].type = LTTNG_EVENT_FUNCTION; | |
2170 | break; | |
0cda4f28 | 2171 | } |
8005f29a | 2172 | tmp[i].loglevel = uevent->attr.loglevel; |
0cda4f28 | 2173 | switch (uevent->attr.loglevel_type) { |
8005f29a | 2174 | case LTTNG_UST_LOGLEVEL_ALL: |
22e25b71 | 2175 | tmp[i].loglevel_type = LTTNG_EVENT_LOGLEVEL_ALL; |
0cda4f28 | 2176 | break; |
8005f29a | 2177 | case LTTNG_UST_LOGLEVEL_RANGE: |
22e25b71 | 2178 | tmp[i].loglevel_type = LTTNG_EVENT_LOGLEVEL_RANGE; |
8005f29a MD |
2179 | break; |
2180 | case LTTNG_UST_LOGLEVEL_SINGLE: | |
22e25b71 | 2181 | tmp[i].loglevel_type = LTTNG_EVENT_LOGLEVEL_SINGLE; |
ac3bd9c0 | 2182 | break; |
9f19cc17 | 2183 | } |
d7b75b30 | 2184 | i++; |
9f19cc17 DG |
2185 | } |
2186 | ||
b551a063 DG |
2187 | ret = nb_event; |
2188 | *events = tmp; | |
2189 | ||
2190 | error: | |
2191 | rcu_read_unlock(); | |
2192 | return ret; | |
9f19cc17 DG |
2193 | } |
2194 | ||
2195 | /* | |
b551a063 | 2196 | * Fill lttng_event array of all kernel events in the channel. |
9f19cc17 | 2197 | */ |
b551a063 DG |
2198 | static int list_lttng_kernel_events(char *channel_name, |
2199 | struct ltt_kernel_session *kernel_session, struct lttng_event **events) | |
9f19cc17 | 2200 | { |
b551a063 DG |
2201 | int i = 0, ret; |
2202 | unsigned int nb_event; | |
9f19cc17 | 2203 | struct ltt_kernel_event *event; |
b551a063 DG |
2204 | struct ltt_kernel_channel *kchan; |
2205 | ||
2206 | kchan = trace_kernel_get_channel_by_name(channel_name, kernel_session); | |
2207 | if (kchan == NULL) { | |
2208 | ret = LTTCOMM_KERN_CHAN_NOT_FOUND; | |
2209 | goto error; | |
2210 | } | |
2211 | ||
2212 | nb_event = kchan->event_count; | |
9f19cc17 DG |
2213 | |
2214 | DBG("Listing events for channel %s", kchan->channel->name); | |
2215 | ||
b551a063 DG |
2216 | if (nb_event == 0) { |
2217 | ret = nb_event; | |
2218 | goto error; | |
2219 | } | |
2220 | ||
2221 | *events = zmalloc(nb_event * sizeof(struct lttng_event)); | |
2222 | if (*events == NULL) { | |
2223 | ret = LTTCOMM_FATAL; | |
2224 | goto error; | |
2225 | } | |
2226 | ||
9f19cc17 DG |
2227 | /* Kernel channels */ |
2228 | cds_list_for_each_entry(event, &kchan->events_list.head , list) { | |
b551a063 DG |
2229 | strncpy((*events)[i].name, event->event->name, LTTNG_SYMBOL_NAME_LEN); |
2230 | (*events)[i].name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0'; | |
2231 | (*events)[i].enabled = event->enabled; | |
9f19cc17 DG |
2232 | switch (event->event->instrumentation) { |
2233 | case LTTNG_KERNEL_TRACEPOINT: | |
b551a063 | 2234 | (*events)[i].type = LTTNG_EVENT_TRACEPOINT; |
9f19cc17 DG |
2235 | break; |
2236 | case LTTNG_KERNEL_KPROBE: | |
2237 | case LTTNG_KERNEL_KRETPROBE: | |
b551a063 DG |
2238 | (*events)[i].type = LTTNG_EVENT_PROBE; |
2239 | memcpy(&(*events)[i].attr.probe, &event->event->u.kprobe, | |
9f19cc17 DG |
2240 | sizeof(struct lttng_kernel_kprobe)); |
2241 | break; | |
2242 | case LTTNG_KERNEL_FUNCTION: | |
b551a063 DG |
2243 | (*events)[i].type = LTTNG_EVENT_FUNCTION; |
2244 | memcpy(&((*events)[i].attr.ftrace), &event->event->u.ftrace, | |
9f19cc17 DG |
2245 | sizeof(struct lttng_kernel_function)); |
2246 | break; | |
0133c199 | 2247 | case LTTNG_KERNEL_NOOP: |
b551a063 | 2248 | (*events)[i].type = LTTNG_EVENT_NOOP; |
0133c199 | 2249 | break; |
a54bd42d | 2250 | case LTTNG_KERNEL_SYSCALL: |
b551a063 | 2251 | (*events)[i].type = LTTNG_EVENT_SYSCALL; |
0133c199 | 2252 | break; |
7a3d1328 MD |
2253 | case LTTNG_KERNEL_ALL: |
2254 | assert(0); | |
2255 | break; | |
9f19cc17 DG |
2256 | } |
2257 | i++; | |
2258 | } | |
b551a063 DG |
2259 | |
2260 | return nb_event; | |
2261 | ||
2262 | error: | |
2263 | return ret; | |
9f19cc17 DG |
2264 | } |
2265 | ||
fac6795d | 2266 | /* |
54d01ffb | 2267 | * Command LTTNG_DISABLE_CHANNEL processed by the client thread. |
fac6795d | 2268 | */ |
54d01ffb DG |
2269 | static int cmd_disable_channel(struct ltt_session *session, |
2270 | int domain, char *channel_name) | |
fac6795d | 2271 | { |
54d01ffb | 2272 | int ret; |
78f0bacd DG |
2273 | struct ltt_ust_session *usess; |
2274 | ||
2275 | usess = session->ust_session; | |
379473d2 | 2276 | |
54d01ffb | 2277 | switch (domain) { |
78f0bacd DG |
2278 | case LTTNG_DOMAIN_KERNEL: |
2279 | { | |
2280 | ret = channel_kernel_disable(session->kernel_session, | |
2281 | channel_name); | |
2282 | if (ret != LTTCOMM_OK) { | |
2283 | goto error; | |
2284 | } | |
54d01ffb | 2285 | |
78f0bacd DG |
2286 | kernel_wait_quiescent(kernel_tracer_fd); |
2287 | break; | |
2288 | } | |
2289 | case LTTNG_DOMAIN_UST: | |
2290 | { | |
2291 | struct ltt_ust_channel *uchan; | |
bec39940 | 2292 | struct lttng_ht *chan_ht; |
78f0bacd | 2293 | |
7885e399 DG |
2294 | chan_ht = usess->domain_global.channels; |
2295 | ||
2296 | uchan = trace_ust_find_channel_by_name(chan_ht, channel_name); | |
78f0bacd DG |
2297 | if (uchan == NULL) { |
2298 | ret = LTTCOMM_UST_CHAN_NOT_FOUND; | |
54d01ffb | 2299 | goto error; |
78f0bacd DG |
2300 | } |
2301 | ||
7885e399 DG |
2302 | ret = channel_ust_disable(usess, domain, uchan); |
2303 | if (ret != LTTCOMM_OK) { | |
78f0bacd DG |
2304 | goto error; |
2305 | } | |
78f0bacd DG |
2306 | break; |
2307 | } | |
d78d6610 | 2308 | #if 0 |
78f0bacd DG |
2309 | case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN: |
2310 | case LTTNG_DOMAIN_UST_EXEC_NAME: | |
2311 | case LTTNG_DOMAIN_UST_PID: | |
d78d6610 | 2312 | #endif |
78f0bacd DG |
2313 | default: |
2314 | ret = LTTCOMM_UNKNOWN_DOMAIN; | |
2315 | goto error; | |
20fe2104 DG |
2316 | } |
2317 | ||
54d01ffb | 2318 | ret = LTTCOMM_OK; |
d65106b1 | 2319 | |
54d01ffb DG |
2320 | error: |
2321 | return ret; | |
2322 | } | |
2323 | ||
2324 | /* | |
2325 | * Command LTTNG_ENABLE_CHANNEL processed by the client thread. | |
2326 | */ | |
44d3bd01 | 2327 | static int cmd_enable_channel(struct ltt_session *session, |
aea829b3 | 2328 | int domain, struct lttng_channel *attr) |
54d01ffb DG |
2329 | { |
2330 | int ret; | |
f6a9efaa | 2331 | struct ltt_ust_session *usess = session->ust_session; |
bec39940 | 2332 | struct lttng_ht *chan_ht; |
f6a9efaa | 2333 | |
5d56b5aa | 2334 | DBG("Enabling channel %s for session %s", attr->name, session->name); |
d65106b1 | 2335 | |
aea829b3 | 2336 | switch (domain) { |
44d3bd01 DG |
2337 | case LTTNG_DOMAIN_KERNEL: |
2338 | { | |
2339 | struct ltt_kernel_channel *kchan; | |
54d01ffb | 2340 | |
44d3bd01 DG |
2341 | kchan = trace_kernel_get_channel_by_name(attr->name, |
2342 | session->kernel_session); | |
2343 | if (kchan == NULL) { | |
2344 | ret = channel_kernel_create(session->kernel_session, | |
2345 | attr, kernel_poll_pipe[1]); | |
2346 | } else { | |
2347 | ret = channel_kernel_enable(session->kernel_session, kchan); | |
2348 | } | |
2349 | ||
2350 | if (ret != LTTCOMM_OK) { | |
2351 | goto error; | |
2352 | } | |
2353 | ||
2354 | kernel_wait_quiescent(kernel_tracer_fd); | |
2355 | break; | |
2356 | } | |
f6a9efaa DG |
2357 | case LTTNG_DOMAIN_UST: |
2358 | { | |
2359 | struct ltt_ust_channel *uchan; | |
2360 | ||
7885e399 | 2361 | chan_ht = usess->domain_global.channels; |
f6a9efaa | 2362 | |
7885e399 | 2363 | uchan = trace_ust_find_channel_by_name(chan_ht, attr->name); |
f6a9efaa | 2364 | if (uchan == NULL) { |
7885e399 | 2365 | ret = channel_ust_create(usess, domain, attr); |
f6a9efaa | 2366 | } else { |
7885e399 | 2367 | ret = channel_ust_enable(usess, domain, uchan); |
48842b30 | 2368 | } |
f6a9efaa DG |
2369 | break; |
2370 | } | |
d78d6610 | 2371 | #if 0 |
78f0bacd DG |
2372 | case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN: |
2373 | case LTTNG_DOMAIN_UST_EXEC_NAME: | |
44d3bd01 | 2374 | case LTTNG_DOMAIN_UST_PID: |
d78d6610 | 2375 | #endif |
44d3bd01 DG |
2376 | default: |
2377 | ret = LTTCOMM_UNKNOWN_DOMAIN; | |
2378 | goto error; | |
54d01ffb DG |
2379 | } |
2380 | ||
54d01ffb DG |
2381 | error: |
2382 | return ret; | |
2383 | } | |
2384 | ||
2385 | /* | |
2386 | * Command LTTNG_DISABLE_EVENT processed by the client thread. | |
2387 | */ | |
2388 | static int cmd_disable_event(struct ltt_session *session, int domain, | |
2389 | char *channel_name, char *event_name) | |
2390 | { | |
2391 | int ret; | |
54d01ffb DG |
2392 | |
2393 | switch (domain) { | |
2394 | case LTTNG_DOMAIN_KERNEL: | |
2bdd86d4 MD |
2395 | { |
2396 | struct ltt_kernel_channel *kchan; | |
b0a40d28 | 2397 | struct ltt_kernel_session *ksess; |
2bdd86d4 | 2398 | |
b0a40d28 DG |
2399 | ksess = session->kernel_session; |
2400 | ||
2401 | kchan = trace_kernel_get_channel_by_name(channel_name, ksess); | |
54d01ffb DG |
2402 | if (kchan == NULL) { |
2403 | ret = LTTCOMM_KERN_CHAN_NOT_FOUND; | |
2404 | goto error; | |
d65106b1 DG |
2405 | } |
2406 | ||
b0a40d28 | 2407 | ret = event_kernel_disable_tracepoint(ksess, kchan, event_name); |
54d01ffb DG |
2408 | if (ret != LTTCOMM_OK) { |
2409 | goto error; | |
2410 | } | |
2411 | ||
2412 | kernel_wait_quiescent(kernel_tracer_fd); | |
d65106b1 | 2413 | break; |
2bdd86d4 MD |
2414 | } |
2415 | case LTTNG_DOMAIN_UST: | |
b0a40d28 | 2416 | { |
b0a40d28 | 2417 | struct ltt_ust_channel *uchan; |
7f79d3a1 | 2418 | struct ltt_ust_session *usess; |
b0a40d28 DG |
2419 | |
2420 | usess = session->ust_session; | |
2421 | ||
2422 | uchan = trace_ust_find_channel_by_name(usess->domain_global.channels, | |
2423 | channel_name); | |
2424 | if (uchan == NULL) { | |
2425 | ret = LTTCOMM_UST_CHAN_NOT_FOUND; | |
2426 | goto error; | |
2427 | } | |
2428 | ||
7f79d3a1 DG |
2429 | ret = event_ust_disable_tracepoint(usess, domain, uchan, event_name); |
2430 | if (ret != LTTCOMM_OK) { | |
b0a40d28 DG |
2431 | goto error; |
2432 | } | |
2433 | ||
7f79d3a1 | 2434 | DBG3("Disable UST event %s in channel %s completed", event_name, |
b0a40d28 | 2435 | channel_name); |
b0a40d28 DG |
2436 | break; |
2437 | } | |
d78d6610 | 2438 | #if 0 |
2bdd86d4 MD |
2439 | case LTTNG_DOMAIN_UST_EXEC_NAME: |
2440 | case LTTNG_DOMAIN_UST_PID: | |
2441 | case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN: | |
d78d6610 | 2442 | #endif |
54d01ffb | 2443 | default: |
1ab1ea0b | 2444 | ret = LTTCOMM_UND; |
54d01ffb | 2445 | goto error; |
d65106b1 | 2446 | } |
26cc6b4e | 2447 | |
54d01ffb DG |
2448 | ret = LTTCOMM_OK; |
2449 | ||
2450 | error: | |
2451 | return ret; | |
2452 | } | |
2453 | ||
2454 | /* | |
2455 | * Command LTTNG_DISABLE_ALL_EVENT processed by the client thread. | |
2456 | */ | |
2457 | static int cmd_disable_event_all(struct ltt_session *session, int domain, | |
2458 | char *channel_name) | |
2459 | { | |
2460 | int ret; | |
54d01ffb DG |
2461 | |
2462 | switch (domain) { | |
2463 | case LTTNG_DOMAIN_KERNEL: | |
9730260e DG |
2464 | { |
2465 | struct ltt_kernel_session *ksess; | |
2466 | struct ltt_kernel_channel *kchan; | |
2467 | ||
2468 | ksess = session->kernel_session; | |
2469 | ||
2470 | kchan = trace_kernel_get_channel_by_name(channel_name, ksess); | |
54d01ffb DG |
2471 | if (kchan == NULL) { |
2472 | ret = LTTCOMM_KERN_CHAN_NOT_FOUND; | |
2473 | goto error; | |
26cc6b4e DG |
2474 | } |
2475 | ||
9730260e | 2476 | ret = event_kernel_disable_all(ksess, kchan); |
54d01ffb | 2477 | if (ret != LTTCOMM_OK) { |
0b97ec54 | 2478 | goto error; |
26cc6b4e DG |
2479 | } |
2480 | ||
54d01ffb | 2481 | kernel_wait_quiescent(kernel_tracer_fd); |
26cc6b4e | 2482 | break; |
9730260e DG |
2483 | } |
2484 | case LTTNG_DOMAIN_UST: | |
2485 | { | |
2486 | struct ltt_ust_session *usess; | |
2487 | struct ltt_ust_channel *uchan; | |
2488 | ||
2489 | usess = session->ust_session; | |
2490 | ||
2491 | uchan = trace_ust_find_channel_by_name(usess->domain_global.channels, | |
2492 | channel_name); | |
2493 | if (uchan == NULL) { | |
2494 | ret = LTTCOMM_UST_CHAN_NOT_FOUND; | |
2495 | goto error; | |
2496 | } | |
2497 | ||
7f79d3a1 DG |
2498 | ret = event_ust_disable_all_tracepoints(usess, domain, uchan); |
2499 | if (ret != 0) { | |
9730260e DG |
2500 | goto error; |
2501 | } | |
2502 | ||
7f79d3a1 | 2503 | DBG3("Disable all UST events in channel %s completed", channel_name); |
9730260e DG |
2504 | |
2505 | break; | |
2506 | } | |
d78d6610 | 2507 | #if 0 |
9730260e DG |
2508 | case LTTNG_DOMAIN_UST_EXEC_NAME: |
2509 | case LTTNG_DOMAIN_UST_PID: | |
2510 | case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN: | |
d78d6610 | 2511 | #endif |
54d01ffb | 2512 | default: |
1ab1ea0b | 2513 | ret = LTTCOMM_UND; |
54d01ffb | 2514 | goto error; |
26cc6b4e | 2515 | } |
e953ef25 | 2516 | |
54d01ffb | 2517 | ret = LTTCOMM_OK; |
e953ef25 | 2518 | |
54d01ffb DG |
2519 | error: |
2520 | return ret; | |
2521 | } | |
f5177a38 | 2522 | |
54d01ffb DG |
2523 | /* |
2524 | * Command LTTNG_ADD_CONTEXT processed by the client thread. | |
2525 | */ | |
2526 | static int cmd_add_context(struct ltt_session *session, int domain, | |
2527 | char *channel_name, char *event_name, struct lttng_event_context *ctx) | |
2528 | { | |
2529 | int ret; | |
f5177a38 | 2530 | |
54d01ffb DG |
2531 | switch (domain) { |
2532 | case LTTNG_DOMAIN_KERNEL: | |
2533 | /* Add kernel context to kernel tracer */ | |
2534 | ret = context_kernel_add(session->kernel_session, ctx, | |
2535 | event_name, channel_name); | |
2536 | if (ret != LTTCOMM_OK) { | |
f5177a38 | 2537 | goto error; |
e953ef25 | 2538 | } |
2bdd86d4 MD |
2539 | break; |
2540 | case LTTNG_DOMAIN_UST: | |
2541 | { | |
55cc08a6 | 2542 | struct ltt_ust_session *usess = session->ust_session; |
e953ef25 | 2543 | |
55cc08a6 DG |
2544 | ret = context_ust_add(usess, domain, ctx, event_name, channel_name); |
2545 | if (ret != LTTCOMM_OK) { | |
2546 | goto error; | |
2bdd86d4 | 2547 | } |
e953ef25 | 2548 | break; |
2bdd86d4 | 2549 | } |
d78d6610 | 2550 | #if 0 |
55cc08a6 DG |
2551 | case LTTNG_DOMAIN_UST_EXEC_NAME: |
2552 | case LTTNG_DOMAIN_UST_PID: | |
2553 | case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN: | |
d78d6610 | 2554 | #endif |
54d01ffb | 2555 | default: |
1ab1ea0b | 2556 | ret = LTTCOMM_UND; |
54d01ffb | 2557 | goto error; |
e953ef25 | 2558 | } |
950131af | 2559 | |
54d01ffb | 2560 | ret = LTTCOMM_OK; |
950131af | 2561 | |
54d01ffb DG |
2562 | error: |
2563 | return ret; | |
2564 | } | |
2565 | ||
2566 | /* | |
2567 | * Command LTTNG_ENABLE_EVENT processed by the client thread. | |
2568 | */ | |
2569 | static int cmd_enable_event(struct ltt_session *session, int domain, | |
2570 | char *channel_name, struct lttng_event *event) | |
2571 | { | |
2572 | int ret; | |
f6cd6b0f | 2573 | struct lttng_channel *attr; |
48842b30 | 2574 | struct ltt_ust_session *usess = session->ust_session; |
54d01ffb DG |
2575 | |
2576 | switch (domain) { | |
2577 | case LTTNG_DOMAIN_KERNEL: | |
2bdd86d4 MD |
2578 | { |
2579 | struct ltt_kernel_channel *kchan; | |
2580 | ||
54d01ffb DG |
2581 | kchan = trace_kernel_get_channel_by_name(channel_name, |
2582 | session->kernel_session); | |
2583 | if (kchan == NULL) { | |
f6cd6b0f DG |
2584 | attr = channel_new_default_attr(domain); |
2585 | if (attr == NULL) { | |
2586 | ret = LTTCOMM_FATAL; | |
2587 | goto error; | |
2588 | } | |
2589 | snprintf(attr->name, NAME_MAX, "%s", channel_name); | |
2590 | ||
54d01ffb | 2591 | /* This call will notify the kernel thread */ |
44d3bd01 | 2592 | ret = channel_kernel_create(session->kernel_session, |
f6cd6b0f | 2593 | attr, kernel_poll_pipe[1]); |
54d01ffb | 2594 | if (ret != LTTCOMM_OK) { |
ff4d74e6 | 2595 | free(attr); |
f5177a38 DG |
2596 | goto error; |
2597 | } | |
ff4d74e6 | 2598 | free(attr); |
54d01ffb | 2599 | } |
950131af | 2600 | |
54d01ffb DG |
2601 | /* Get the newly created kernel channel pointer */ |
2602 | kchan = trace_kernel_get_channel_by_name(channel_name, | |
2603 | session->kernel_session); | |
2604 | if (kchan == NULL) { | |
2605 | /* This sould not happen... */ | |
2606 | ret = LTTCOMM_FATAL; | |
2607 | goto error; | |
2608 | } | |
f5177a38 | 2609 | |
48842b30 DG |
2610 | ret = event_kernel_enable_tracepoint(session->kernel_session, kchan, |
2611 | event); | |
54d01ffb | 2612 | if (ret != LTTCOMM_OK) { |
f5177a38 | 2613 | goto error; |
950131af DG |
2614 | } |
2615 | ||
54d01ffb | 2616 | kernel_wait_quiescent(kernel_tracer_fd); |
950131af | 2617 | break; |
2bdd86d4 MD |
2618 | } |
2619 | case LTTNG_DOMAIN_UST: | |
2620 | { | |
aea829b3 | 2621 | struct lttng_channel *attr; |
edb67388 | 2622 | struct ltt_ust_channel *uchan; |
2bdd86d4 | 2623 | |
edb67388 | 2624 | /* Get channel from global UST domain */ |
48842b30 DG |
2625 | uchan = trace_ust_find_channel_by_name(usess->domain_global.channels, |
2626 | channel_name); | |
2627 | if (uchan == NULL) { | |
aea829b3 DG |
2628 | /* Create default channel */ |
2629 | attr = channel_new_default_attr(domain); | |
2630 | if (attr == NULL) { | |
2631 | ret = LTTCOMM_FATAL; | |
2632 | goto error; | |
2633 | } | |
596219f7 | 2634 | snprintf(attr->name, NAME_MAX, "%s", channel_name); |
edb67388 | 2635 | attr->name[NAME_MAX - 1] = '\0'; |
aea829b3 | 2636 | |
7885e399 | 2637 | ret = channel_ust_create(usess, domain, attr); |
edb67388 | 2638 | if (ret != LTTCOMM_OK) { |
ff4d74e6 | 2639 | free(attr); |
aea829b3 DG |
2640 | goto error; |
2641 | } | |
aea829b3 DG |
2642 | free(attr); |
2643 | ||
2644 | /* Get the newly created channel reference back */ | |
2645 | uchan = trace_ust_find_channel_by_name( | |
2646 | usess->domain_global.channels, channel_name); | |
2647 | if (uchan == NULL) { | |
2648 | /* Something is really wrong */ | |
2649 | ret = LTTCOMM_FATAL; | |
2650 | goto error; | |
2651 | } | |
48842b30 | 2652 | } |
2bdd86d4 | 2653 | |
edb67388 | 2654 | /* At this point, the session and channel exist on the tracer */ |
edb67388 DG |
2655 | ret = event_ust_enable_tracepoint(usess, domain, uchan, event); |
2656 | if (ret != LTTCOMM_OK) { | |
48842b30 | 2657 | goto error; |
2bdd86d4 MD |
2658 | } |
2659 | break; | |
2660 | } | |
d78d6610 | 2661 | #if 0 |
2bdd86d4 MD |
2662 | case LTTNG_DOMAIN_UST_EXEC_NAME: |
2663 | case LTTNG_DOMAIN_UST_PID: | |
2664 | case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN: | |
d78d6610 | 2665 | #endif |
54d01ffb | 2666 | default: |
1ab1ea0b | 2667 | ret = LTTCOMM_UND; |
54d01ffb | 2668 | goto error; |
950131af | 2669 | } |
d36b8583 | 2670 | |
54d01ffb | 2671 | ret = LTTCOMM_OK; |
d36b8583 | 2672 | |
54d01ffb DG |
2673 | error: |
2674 | return ret; | |
2675 | } | |
7d29a247 | 2676 | |
54d01ffb DG |
2677 | /* |
2678 | * Command LTTNG_ENABLE_ALL_EVENT processed by the client thread. | |
2679 | */ | |
2680 | static int cmd_enable_event_all(struct ltt_session *session, int domain, | |
8c9ae521 | 2681 | char *channel_name, int event_type) |
54d01ffb DG |
2682 | { |
2683 | int ret; | |
2684 | struct ltt_kernel_channel *kchan; | |
7d29a247 | 2685 | |
54d01ffb DG |
2686 | switch (domain) { |
2687 | case LTTNG_DOMAIN_KERNEL: | |
2688 | kchan = trace_kernel_get_channel_by_name(channel_name, | |
2689 | session->kernel_session); | |
2690 | if (kchan == NULL) { | |
2691 | /* This call will notify the kernel thread */ | |
44d3bd01 DG |
2692 | ret = channel_kernel_create(session->kernel_session, NULL, |
2693 | kernel_poll_pipe[1]); | |
54d01ffb DG |
2694 | if (ret != LTTCOMM_OK) { |
2695 | goto error; | |
d36b8583 | 2696 | } |
0d0c377a | 2697 | |
8f69e5eb DG |
2698 | /* Get the newly created kernel channel pointer */ |
2699 | kchan = trace_kernel_get_channel_by_name(channel_name, | |
2700 | session->kernel_session); | |
2701 | if (kchan == NULL) { | |
2702 | /* This sould not happen... */ | |
2703 | ret = LTTCOMM_FATAL; | |
2704 | goto error; | |
2705 | } | |
2706 | ||
54d01ffb | 2707 | } |
0fdd1e2c | 2708 | |
7a3d1328 | 2709 | switch (event_type) { |
76d45b40 | 2710 | case LTTNG_EVENT_SYSCALL: |
7a3d1328 | 2711 | ret = event_kernel_enable_all_syscalls(session->kernel_session, |
8c9ae521 | 2712 | kchan, kernel_tracer_fd); |
7a3d1328 | 2713 | break; |
76d45b40 | 2714 | case LTTNG_EVENT_TRACEPOINT: |
8c9ae521 | 2715 | /* |
7a3d1328 MD |
2716 | * This call enables all LTTNG_KERNEL_TRACEPOINTS and |
2717 | * events already registered to the channel. | |
8c9ae521 | 2718 | */ |
7a3d1328 MD |
2719 | ret = event_kernel_enable_all_tracepoints(session->kernel_session, |
2720 | kchan, kernel_tracer_fd); | |
2721 | break; | |
76d45b40 | 2722 | case LTTNG_EVENT_ALL: |
7a3d1328 | 2723 | /* Enable syscalls and tracepoints */ |
8c9ae521 DG |
2724 | ret = event_kernel_enable_all(session->kernel_session, |
2725 | kchan, kernel_tracer_fd); | |
7a3d1328 MD |
2726 | break; |
2727 | default: | |
2728 | ret = LTTCOMM_KERN_ENABLE_FAIL; | |
2729 | goto error; | |
8c9ae521 | 2730 | } |
8f69e5eb DG |
2731 | |
2732 | /* Manage return value */ | |
54d01ffb | 2733 | if (ret != LTTCOMM_OK) { |
0d0c377a | 2734 | goto error; |
d36b8583 DG |
2735 | } |
2736 | ||
54d01ffb | 2737 | kernel_wait_quiescent(kernel_tracer_fd); |
d36b8583 | 2738 | break; |
76d45b40 DG |
2739 | case LTTNG_DOMAIN_UST: |
2740 | { | |
2741 | struct lttng_channel *attr; | |
2742 | struct ltt_ust_channel *uchan; | |
2743 | struct ltt_ust_session *usess = session->ust_session; | |
2744 | ||
2745 | /* Get channel from global UST domain */ | |
2746 | uchan = trace_ust_find_channel_by_name(usess->domain_global.channels, | |
2747 | channel_name); | |
2748 | if (uchan == NULL) { | |
2749 | /* Create default channel */ | |
2750 | attr = channel_new_default_attr(domain); | |
2751 | if (attr == NULL) { | |
2752 | ret = LTTCOMM_FATAL; | |
2753 | goto error; | |
2754 | } | |
2755 | snprintf(attr->name, NAME_MAX, "%s", channel_name); | |
2756 | attr->name[NAME_MAX - 1] = '\0'; | |
2757 | ||
2758 | /* Use the internal command enable channel */ | |
7885e399 | 2759 | ret = channel_ust_create(usess, domain, attr); |
76d45b40 DG |
2760 | if (ret != LTTCOMM_OK) { |
2761 | free(attr); | |
2762 | goto error; | |
2763 | } | |
2764 | free(attr); | |
2765 | ||
2766 | /* Get the newly created channel reference back */ | |
2767 | uchan = trace_ust_find_channel_by_name( | |
2768 | usess->domain_global.channels, channel_name); | |
2769 | if (uchan == NULL) { | |
2770 | /* Something is really wrong */ | |
2771 | ret = LTTCOMM_FATAL; | |
2772 | goto error; | |
2773 | } | |
2774 | } | |
2775 | ||
2776 | /* At this point, the session and channel exist on the tracer */ | |
2777 | ||
2778 | switch (event_type) { | |
2779 | case LTTNG_EVENT_ALL: | |
2780 | case LTTNG_EVENT_TRACEPOINT: | |
2781 | ret = event_ust_enable_all_tracepoints(usess, domain, uchan); | |
2782 | if (ret != LTTCOMM_OK) { | |
2783 | goto error; | |
2784 | } | |
2785 | break; | |
2786 | default: | |
2787 | ret = LTTCOMM_UST_ENABLE_FAIL; | |
2788 | goto error; | |
2789 | } | |
2790 | ||
2791 | /* Manage return value */ | |
2792 | if (ret != LTTCOMM_OK) { | |
2793 | goto error; | |
2794 | } | |
2795 | ||
2796 | break; | |
2797 | } | |
d78d6610 | 2798 | #if 0 |
76d45b40 DG |
2799 | case LTTNG_DOMAIN_UST_EXEC_NAME: |
2800 | case LTTNG_DOMAIN_UST_PID: | |
2801 | case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN: | |
d78d6610 | 2802 | #endif |
54d01ffb | 2803 | default: |
1ab1ea0b | 2804 | ret = LTTCOMM_UND; |
54d01ffb | 2805 | goto error; |
d36b8583 | 2806 | } |
f3ed775e | 2807 | |
54d01ffb DG |
2808 | ret = LTTCOMM_OK; |
2809 | ||
2810 | error: | |
2811 | return ret; | |
2812 | } | |
2813 | ||
2814 | /* | |
2815 | * Command LTTNG_LIST_TRACEPOINTS processed by the client thread. | |
2816 | */ | |
2817 | static ssize_t cmd_list_tracepoints(int domain, struct lttng_event **events) | |
2818 | { | |
2819 | int ret; | |
2820 | ssize_t nb_events = 0; | |
2821 | ||
2822 | switch (domain) { | |
2823 | case LTTNG_DOMAIN_KERNEL: | |
2824 | nb_events = kernel_list_events(kernel_tracer_fd, events); | |
2825 | if (nb_events < 0) { | |
2826 | ret = LTTCOMM_KERN_LIST_FAIL; | |
2827 | goto error; | |
894be886 | 2828 | } |
54d01ffb | 2829 | break; |
b551a063 DG |
2830 | case LTTNG_DOMAIN_UST: |
2831 | nb_events = ust_app_list_events(events); | |
2832 | if (nb_events < 0) { | |
2833 | ret = LTTCOMM_UST_LIST_FAIL; | |
2834 | goto error; | |
2835 | } | |
2836 | break; | |
54d01ffb | 2837 | default: |
1ab1ea0b | 2838 | ret = LTTCOMM_UND; |
54d01ffb DG |
2839 | goto error; |
2840 | } | |
894be886 | 2841 | |
54d01ffb | 2842 | return nb_events; |
7d29a247 | 2843 | |
54d01ffb DG |
2844 | error: |
2845 | /* Return negative value to differentiate return code */ | |
2846 | return -ret; | |
2847 | } | |
b389abbe | 2848 | |
54d01ffb DG |
2849 | /* |
2850 | * Command LTTNG_START_TRACE processed by the client thread. | |
2851 | */ | |
2852 | static int cmd_start_trace(struct ltt_session *session) | |
2853 | { | |
2854 | int ret; | |
54d01ffb | 2855 | struct ltt_kernel_session *ksession; |
b9d9b220 | 2856 | struct ltt_ust_session *usess; |
b389abbe | 2857 | |
54d01ffb DG |
2858 | /* Short cut */ |
2859 | ksession = session->kernel_session; | |
b9d9b220 | 2860 | usess = session->ust_session; |
5eb91c98 | 2861 | |
b9ef1c83 | 2862 | if (session->enabled) { |
80e327fa DG |
2863 | /* Already started. */ |
2864 | ret = LTTCOMM_TRACE_ALREADY_STARTED; | |
b9ef1c83 DG |
2865 | goto error; |
2866 | } | |
2867 | ||
464dd62d MD |
2868 | session->enabled = 1; |
2869 | ||
54d01ffb DG |
2870 | /* Kernel tracing */ |
2871 | if (ksession != NULL) { | |
2bdd86d4 MD |
2872 | struct ltt_kernel_channel *kchan; |
2873 | ||
54d01ffb DG |
2874 | /* Open kernel metadata */ |
2875 | if (ksession->metadata == NULL) { | |
2876 | ret = kernel_open_metadata(ksession, ksession->trace_path); | |
2877 | if (ret < 0) { | |
2878 | ret = LTTCOMM_KERN_META_FAIL; | |
2879 | goto error; | |
b389abbe | 2880 | } |
54d01ffb | 2881 | } |
7d29a247 | 2882 | |
54d01ffb | 2883 | /* Open kernel metadata stream */ |
03550b58 | 2884 | if (ksession->metadata_stream_fd < 0) { |
54d01ffb DG |
2885 | ret = kernel_open_metadata_stream(ksession); |
2886 | if (ret < 0) { | |
2887 | ERR("Kernel create metadata stream failed"); | |
2888 | ret = LTTCOMM_KERN_STREAM_FAIL; | |
2889 | goto error; | |
2890 | } | |
2891 | } | |
2892 | ||
2893 | /* For each channel */ | |
2894 | cds_list_for_each_entry(kchan, &ksession->channel_list.head, list) { | |
2895 | if (kchan->stream_count == 0) { | |
2896 | ret = kernel_open_channel_stream(kchan); | |
2897 | if (ret < 0) { | |
2898 | ret = LTTCOMM_KERN_STREAM_FAIL; | |
7d29a247 DG |
2899 | goto error; |
2900 | } | |
54d01ffb DG |
2901 | /* Update the stream global counter */ |
2902 | ksession->stream_count_global += ret; | |
7d29a247 | 2903 | } |
54d01ffb DG |
2904 | } |
2905 | ||
2906 | /* Setup kernel consumer socket and send fds to it */ | |
2907 | ret = init_kernel_tracing(ksession); | |
2908 | if (ret < 0) { | |
2909 | ret = LTTCOMM_KERN_START_FAIL; | |
2910 | goto error; | |
2911 | } | |
2912 | ||
2913 | /* This start the kernel tracing */ | |
2914 | ret = kernel_start_session(ksession); | |
2915 | if (ret < 0) { | |
2916 | ret = LTTCOMM_KERN_START_FAIL; | |
2917 | goto error; | |
2918 | } | |
2919 | ||
2920 | /* Quiescent wait after starting trace */ | |
2921 | kernel_wait_quiescent(kernel_tracer_fd); | |
2922 | } | |
2923 | ||
36dc12cc | 2924 | /* Flag session that trace should start automatically */ |
b9d9b220 DG |
2925 | if (usess) { |
2926 | usess->start_trace = 1; | |
36dc12cc | 2927 | |
b9d9b220 DG |
2928 | ret = ust_app_start_trace_all(usess); |
2929 | if (ret < 0) { | |
2930 | ret = LTTCOMM_UST_START_FAIL; | |
2931 | goto error; | |
2932 | } | |
2bdd86d4 | 2933 | } |
54d01ffb DG |
2934 | |
2935 | ret = LTTCOMM_OK; | |
2936 | ||
2937 | error: | |
2938 | return ret; | |
2939 | } | |
2940 | ||
2941 | /* | |
2942 | * Command LTTNG_STOP_TRACE processed by the client thread. | |
2943 | */ | |
2944 | static int cmd_stop_trace(struct ltt_session *session) | |
2945 | { | |
2946 | int ret; | |
2947 | struct ltt_kernel_channel *kchan; | |
2948 | struct ltt_kernel_session *ksession; | |
8be98f9a | 2949 | struct ltt_ust_session *usess; |
54d01ffb DG |
2950 | |
2951 | /* Short cut */ | |
2952 | ksession = session->kernel_session; | |
8be98f9a | 2953 | usess = session->ust_session; |
54d01ffb | 2954 | |
b9ef1c83 | 2955 | if (!session->enabled) { |
80e327fa | 2956 | ret = LTTCOMM_TRACE_ALREADY_STOPPED; |
b9ef1c83 DG |
2957 | goto error; |
2958 | } | |
2959 | ||
464dd62d MD |
2960 | session->enabled = 0; |
2961 | ||
54d01ffb DG |
2962 | /* Kernel tracer */ |
2963 | if (ksession != NULL) { | |
2964 | DBG("Stop kernel tracing"); | |
2965 | ||
2966 | /* Flush all buffers before stopping */ | |
2967 | ret = kernel_metadata_flush_buffer(ksession->metadata_stream_fd); | |
2968 | if (ret < 0) { | |
2969 | ERR("Kernel metadata flush failed"); | |
2970 | } | |
f34daff7 | 2971 | |
54d01ffb DG |
2972 | cds_list_for_each_entry(kchan, &ksession->channel_list.head, list) { |
2973 | ret = kernel_flush_buffer(kchan); | |
0d0c377a | 2974 | if (ret < 0) { |
54d01ffb | 2975 | ERR("Kernel flush buffer error"); |
7d29a247 | 2976 | } |
54d01ffb | 2977 | } |
19e70852 | 2978 | |
54d01ffb DG |
2979 | ret = kernel_stop_session(ksession); |
2980 | if (ret < 0) { | |
2981 | ret = LTTCOMM_KERN_STOP_FAIL; | |
19e70852 | 2982 | goto error; |
f3ed775e | 2983 | } |
54d01ffb DG |
2984 | |
2985 | kernel_wait_quiescent(kernel_tracer_fd); | |
894be886 | 2986 | } |
54d01ffb | 2987 | |
8be98f9a MD |
2988 | if (usess) { |
2989 | usess->start_trace = 0; | |
2bdd86d4 | 2990 | |
8be98f9a | 2991 | ret = ust_app_stop_trace_all(usess); |
2bdd86d4 | 2992 | if (ret < 0) { |
190df5ac | 2993 | ret = LTTCOMM_UST_STOP_FAIL; |
2bdd86d4 MD |
2994 | goto error; |
2995 | } | |
2bdd86d4 | 2996 | } |
54d01ffb DG |
2997 | |
2998 | ret = LTTCOMM_OK; | |
2999 | ||
3000 | error: | |
3001 | return ret; | |
3002 | } | |
3003 | ||
3004 | /* | |
3005 | * Command LTTNG_CREATE_SESSION processed by the client thread. | |
3006 | */ | |
730389d9 | 3007 | static int cmd_create_session(char *name, char *path, lttng_sock_cred *creds) |
54d01ffb DG |
3008 | { |
3009 | int ret; | |
3010 | ||
730389d9 DG |
3011 | ret = session_create(name, path, LTTNG_SOCK_GET_UID_CRED(creds), |
3012 | LTTNG_SOCK_GET_GID_CRED(creds)); | |
54d01ffb DG |
3013 | if (ret != LTTCOMM_OK) { |
3014 | goto error; | |
3015 | } | |
3016 | ||
3017 | ret = LTTCOMM_OK; | |
3018 | ||
3019 | error: | |
3020 | return ret; | |
3021 | } | |
3022 | ||
3023 | /* | |
3024 | * Command LTTNG_DESTROY_SESSION processed by the client thread. | |
3025 | */ | |
3026 | static int cmd_destroy_session(struct ltt_session *session, char *name) | |
3027 | { | |
3028 | int ret; | |
3029 | ||
3030 | /* Clean kernel session teardown */ | |
3031 | teardown_kernel_session(session); | |
84cd17c6 MD |
3032 | /* UST session teardown */ |
3033 | teardown_ust_session(session); | |
54d01ffb DG |
3034 | |
3035 | /* | |
3036 | * Must notify the kernel thread here to update it's poll setin order | |
3037 | * to remove the channel(s)' fd just destroyed. | |
3038 | */ | |
3039 | ret = notify_thread_pipe(kernel_poll_pipe[1]); | |
3040 | if (ret < 0) { | |
76d7553f | 3041 | PERROR("write kernel poll pipe"); |
54d01ffb DG |
3042 | } |
3043 | ||
271933a4 | 3044 | ret = session_destroy(session); |
54d01ffb DG |
3045 | |
3046 | return ret; | |
3047 | } | |
3048 | ||
3049 | /* | |
3050 | * Command LTTNG_CALIBRATE processed by the client thread. | |
3051 | */ | |
3052 | static int cmd_calibrate(int domain, struct lttng_calibrate *calibrate) | |
3053 | { | |
3054 | int ret; | |
3055 | ||
3056 | switch (domain) { | |
3057 | case LTTNG_DOMAIN_KERNEL: | |
33a2b854 | 3058 | { |
54d01ffb | 3059 | struct lttng_kernel_calibrate kcalibrate; |
33a2b854 | 3060 | |
54d01ffb DG |
3061 | kcalibrate.type = calibrate->type; |
3062 | ret = kernel_calibrate(kernel_tracer_fd, &kcalibrate); | |
33a2b854 | 3063 | if (ret < 0) { |
54d01ffb DG |
3064 | ret = LTTCOMM_KERN_ENABLE_FAIL; |
3065 | goto error; | |
33a2b854 | 3066 | } |
54d01ffb DG |
3067 | break; |
3068 | } | |
4466912f DG |
3069 | case LTTNG_DOMAIN_UST: |
3070 | { | |
3071 | struct lttng_ust_calibrate ucalibrate; | |
3072 | ||
3073 | ucalibrate.type = calibrate->type; | |
3074 | ret = ust_app_calibrate_glb(&ucalibrate); | |
3075 | if (ret < 0) { | |
3076 | ret = LTTCOMM_UST_CALIBRATE_FAIL; | |
3077 | goto error; | |
3078 | } | |
3079 | break; | |
3080 | } | |
54d01ffb | 3081 | default: |
1ab1ea0b | 3082 | ret = LTTCOMM_UND; |
54d01ffb DG |
3083 | goto error; |
3084 | } | |
33a2b854 | 3085 | |
54d01ffb | 3086 | ret = LTTCOMM_OK; |
33a2b854 | 3087 | |
54d01ffb DG |
3088 | error: |
3089 | return ret; | |
3090 | } | |
7d29a247 | 3091 | |
54d01ffb DG |
3092 | /* |
3093 | * Command LTTNG_REGISTER_CONSUMER processed by the client thread. | |
3094 | */ | |
3095 | static int cmd_register_consumer(struct ltt_session *session, int domain, | |
3096 | char *sock_path) | |
3097 | { | |
3098 | int ret, sock; | |
b389abbe | 3099 | |
54d01ffb DG |
3100 | switch (domain) { |
3101 | case LTTNG_DOMAIN_KERNEL: | |
3102 | /* Can't register a consumer if there is already one */ | |
48c4f28c | 3103 | if (session->kernel_session->consumer_fds_sent != 0) { |
54d01ffb DG |
3104 | ret = LTTCOMM_KERN_CONSUMER_FAIL; |
3105 | goto error; | |
3106 | } | |
3107 | ||
3108 | sock = lttcomm_connect_unix_sock(sock_path); | |
3109 | if (sock < 0) { | |
3110 | ret = LTTCOMM_CONNECT_FAIL; | |
3111 | goto error; | |
3112 | } | |
3113 | ||
3114 | session->kernel_session->consumer_fd = sock; | |
3115 | break; | |
3116 | default: | |
3117 | /* TODO: Userspace tracing */ | |
1ab1ea0b | 3118 | ret = LTTCOMM_UND; |
54d01ffb DG |
3119 | goto error; |
3120 | } | |
3121 | ||
3122 | ret = LTTCOMM_OK; | |
3123 | ||
3124 | error: | |
3125 | return ret; | |
3126 | } | |
3127 | ||
3128 | /* | |
3129 | * Command LTTNG_LIST_DOMAINS processed by the client thread. | |
3130 | */ | |
3131 | static ssize_t cmd_list_domains(struct ltt_session *session, | |
3132 | struct lttng_domain **domains) | |
3133 | { | |
b551a063 | 3134 | int ret, index = 0; |
54d01ffb DG |
3135 | ssize_t nb_dom = 0; |
3136 | ||
3137 | if (session->kernel_session != NULL) { | |
b551a063 | 3138 | DBG3("Listing domains found kernel domain"); |
54d01ffb DG |
3139 | nb_dom++; |
3140 | } | |
3141 | ||
b551a063 DG |
3142 | if (session->ust_session != NULL) { |
3143 | DBG3("Listing domains found UST global domain"); | |
3144 | nb_dom++; | |
3145 | } | |
54d01ffb | 3146 | |
b551a063 | 3147 | *domains = zmalloc(nb_dom * sizeof(struct lttng_domain)); |
54d01ffb DG |
3148 | if (*domains == NULL) { |
3149 | ret = -LTTCOMM_FATAL; | |
3150 | goto error; | |
3151 | } | |
3152 | ||
b551a063 DG |
3153 | if (session->kernel_session != NULL) { |
3154 | (*domains)[index].type = LTTNG_DOMAIN_KERNEL; | |
3155 | index++; | |
3156 | } | |
3157 | ||
3158 | if (session->ust_session != NULL) { | |
3159 | (*domains)[index].type = LTTNG_DOMAIN_UST; | |
3160 | index++; | |
3161 | } | |
54d01ffb | 3162 | |
54d01ffb DG |
3163 | return nb_dom; |
3164 | ||
3165 | error: | |
3166 | return ret; | |
3167 | } | |
3168 | ||
3169 | /* | |
3170 | * Command LTTNG_LIST_CHANNELS processed by the client thread. | |
3171 | */ | |
b551a063 | 3172 | static ssize_t cmd_list_channels(int domain, struct ltt_session *session, |
54d01ffb DG |
3173 | struct lttng_channel **channels) |
3174 | { | |
3175 | int ret; | |
3176 | ssize_t nb_chan = 0; | |
3177 | ||
b551a063 DG |
3178 | switch (domain) { |
3179 | case LTTNG_DOMAIN_KERNEL: | |
3180 | if (session->kernel_session != NULL) { | |
3181 | nb_chan = session->kernel_session->channel_count; | |
3182 | } | |
0df502fd | 3183 | DBG3("Number of kernel channels %zd", nb_chan); |
b551a063 DG |
3184 | break; |
3185 | case LTTNG_DOMAIN_UST: | |
3186 | if (session->ust_session != NULL) { | |
bec39940 | 3187 | nb_chan = lttng_ht_get_count( |
b551a063 DG |
3188 | session->ust_session->domain_global.channels); |
3189 | } | |
0df502fd | 3190 | DBG3("Number of UST global channels %zd", nb_chan); |
b551a063 DG |
3191 | break; |
3192 | default: | |
3193 | *channels = NULL; | |
1ab1ea0b | 3194 | ret = -LTTCOMM_UND; |
54d01ffb DG |
3195 | goto error; |
3196 | } | |
3197 | ||
b551a063 DG |
3198 | if (nb_chan > 0) { |
3199 | *channels = zmalloc(nb_chan * sizeof(struct lttng_channel)); | |
3200 | if (*channels == NULL) { | |
3201 | ret = -LTTCOMM_FATAL; | |
3202 | goto error; | |
3203 | } | |
54d01ffb | 3204 | |
b551a063 DG |
3205 | list_lttng_channels(domain, session, *channels); |
3206 | } else { | |
3207 | *channels = NULL; | |
3208 | } | |
2bdd86d4 | 3209 | |
54d01ffb DG |
3210 | return nb_chan; |
3211 | ||
3212 | error: | |
3213 | return ret; | |
3214 | } | |
3215 | ||
3216 | /* | |
3217 | * Command LTTNG_LIST_EVENTS processed by the client thread. | |
3218 | */ | |
b551a063 | 3219 | static ssize_t cmd_list_events(int domain, struct ltt_session *session, |
54d01ffb DG |
3220 | char *channel_name, struct lttng_event **events) |
3221 | { | |
b551a063 | 3222 | int ret = 0; |
54d01ffb | 3223 | ssize_t nb_event = 0; |
54d01ffb | 3224 | |
b551a063 DG |
3225 | switch (domain) { |
3226 | case LTTNG_DOMAIN_KERNEL: | |
3227 | if (session->kernel_session != NULL) { | |
3228 | nb_event = list_lttng_kernel_events(channel_name, | |
3229 | session->kernel_session, events); | |
54d01ffb | 3230 | } |
b551a063 DG |
3231 | break; |
3232 | case LTTNG_DOMAIN_UST: | |
3233 | { | |
3234 | if (session->ust_session != NULL) { | |
3235 | nb_event = list_lttng_ust_global_events(channel_name, | |
3236 | &session->ust_session->domain_global, events); | |
3237 | } | |
3238 | break; | |
54d01ffb | 3239 | } |
b551a063 | 3240 | default: |
1ab1ea0b | 3241 | ret = -LTTCOMM_UND; |
54d01ffb DG |
3242 | goto error; |
3243 | } | |
3244 | ||
b551a063 | 3245 | ret = nb_event; |
54d01ffb DG |
3246 | |
3247 | error: | |
3248 | return ret; | |
3249 | } | |
3250 | ||
3251 | /* | |
3252 | * Process the command requested by the lttng client within the command | |
3253 | * context structure. This function make sure that the return structure (llm) | |
3254 | * is set and ready for transmission before returning. | |
3255 | * | |
3256 | * Return any error encountered or 0 for success. | |
3257 | */ | |
3258 | static int process_client_msg(struct command_ctx *cmd_ctx) | |
3259 | { | |
3260 | int ret = LTTCOMM_OK; | |
44d3bd01 | 3261 | int need_tracing_session = 1; |
2e09ba09 | 3262 | int need_domain; |
54d01ffb DG |
3263 | |
3264 | DBG("Processing client command %d", cmd_ctx->lsm->cmd_type); | |
3265 | ||
2e09ba09 MD |
3266 | switch (cmd_ctx->lsm->cmd_type) { |
3267 | case LTTNG_CREATE_SESSION: | |
3268 | case LTTNG_DESTROY_SESSION: | |
3269 | case LTTNG_LIST_SESSIONS: | |
3270 | case LTTNG_LIST_DOMAINS: | |
3271 | case LTTNG_START_TRACE: | |
3272 | case LTTNG_STOP_TRACE: | |
3273 | need_domain = 0; | |
3aace903 | 3274 | break; |
2e09ba09 MD |
3275 | default: |
3276 | need_domain = 1; | |
3277 | } | |
3278 | ||
3279 | if (opt_no_kernel && need_domain | |
3280 | && cmd_ctx->lsm->domain.type == LTTNG_DOMAIN_KERNEL) { | |
531d29f9 MD |
3281 | if (!is_root) { |
3282 | ret = LTTCOMM_NEED_ROOT_SESSIOND; | |
3283 | } else { | |
3284 | ret = LTTCOMM_KERN_NA; | |
3285 | } | |
4fba7219 DG |
3286 | goto error; |
3287 | } | |
3288 | ||
54d01ffb DG |
3289 | /* |
3290 | * Check for command that don't needs to allocate a returned payload. We do | |
44d3bd01 | 3291 | * this here so we don't have to make the call for no payload at each |
54d01ffb DG |
3292 | * command. |
3293 | */ | |
3294 | switch(cmd_ctx->lsm->cmd_type) { | |
3295 | case LTTNG_LIST_SESSIONS: | |
3296 | case LTTNG_LIST_TRACEPOINTS: | |
3297 | case LTTNG_LIST_DOMAINS: | |
3298 | case LTTNG_LIST_CHANNELS: | |
3299 | case LTTNG_LIST_EVENTS: | |
3300 | break; | |
3301 | default: | |
3302 | /* Setup lttng message with no payload */ | |
3303 | ret = setup_lttng_msg(cmd_ctx, 0); | |
3304 | if (ret < 0) { | |
3305 | /* This label does not try to unlock the session */ | |
3306 | goto init_setup_error; | |
3307 | } | |
3308 | } | |
3309 | ||
3310 | /* Commands that DO NOT need a session. */ | |
3311 | switch (cmd_ctx->lsm->cmd_type) { | |
54d01ffb | 3312 | case LTTNG_CREATE_SESSION: |
2e09ba09 | 3313 | case LTTNG_CALIBRATE: |
54d01ffb DG |
3314 | case LTTNG_LIST_SESSIONS: |
3315 | case LTTNG_LIST_TRACEPOINTS: | |
44d3bd01 | 3316 | need_tracing_session = 0; |
54d01ffb DG |
3317 | break; |
3318 | default: | |
3319 | DBG("Getting session %s by name", cmd_ctx->lsm->session.name); | |
256a5576 MD |
3320 | /* |
3321 | * We keep the session list lock across _all_ commands | |
3322 | * for now, because the per-session lock does not | |
3323 | * handle teardown properly. | |
3324 | */ | |
74babd95 | 3325 | session_lock_list(); |
54d01ffb DG |
3326 | cmd_ctx->session = session_find_by_name(cmd_ctx->lsm->session.name); |
3327 | if (cmd_ctx->session == NULL) { | |
3328 | if (cmd_ctx->lsm->session.name != NULL) { | |
3329 | ret = LTTCOMM_SESS_NOT_FOUND; | |
3330 | } else { | |
3331 | /* If no session name specified */ | |
3332 | ret = LTTCOMM_SELECT_SESS; | |
3333 | } | |
3334 | goto error; | |
3335 | } else { | |
3336 | /* Acquire lock for the session */ | |
3337 | session_lock(cmd_ctx->session); | |
3338 | } | |
3339 | break; | |
3340 | } | |
b389abbe | 3341 | |
2e09ba09 MD |
3342 | if (!need_domain) { |
3343 | goto skip_domain; | |
3344 | } | |
54d01ffb DG |
3345 | /* |
3346 | * Check domain type for specific "pre-action". | |
3347 | */ | |
3348 | switch (cmd_ctx->lsm->domain.type) { | |
3349 | case LTTNG_DOMAIN_KERNEL: | |
d1f1c568 | 3350 | if (!is_root) { |
531d29f9 | 3351 | ret = LTTCOMM_NEED_ROOT_SESSIOND; |
d1f1c568 DG |
3352 | goto error; |
3353 | } | |
3354 | ||
54d01ffb | 3355 | /* Kernel tracer check */ |
a4b35e07 | 3356 | if (kernel_tracer_fd == -1) { |
54d01ffb | 3357 | /* Basically, load kernel tracer modules */ |
096102bd DG |
3358 | ret = init_kernel_tracer(); |
3359 | if (ret != 0) { | |
54d01ffb DG |
3360 | goto error; |
3361 | } | |
3362 | } | |
5eb91c98 | 3363 | |
54d01ffb | 3364 | /* Need a session for kernel command */ |
44d3bd01 | 3365 | if (need_tracing_session) { |
54d01ffb | 3366 | if (cmd_ctx->session->kernel_session == NULL) { |
6df2e2c9 | 3367 | ret = create_kernel_session(cmd_ctx->session); |
5eb91c98 | 3368 | if (ret < 0) { |
54d01ffb | 3369 | ret = LTTCOMM_KERN_SESS_FAIL; |
5eb91c98 DG |
3370 | goto error; |
3371 | } | |
b389abbe | 3372 | } |
7d29a247 | 3373 | |
54d01ffb | 3374 | /* Start the kernel consumer daemon */ |
3bd1e081 MD |
3375 | pthread_mutex_lock(&kconsumer_data.pid_mutex); |
3376 | if (kconsumer_data.pid == 0 && | |
54d01ffb | 3377 | cmd_ctx->lsm->cmd_type != LTTNG_REGISTER_CONSUMER) { |
3bd1e081 MD |
3378 | pthread_mutex_unlock(&kconsumer_data.pid_mutex); |
3379 | ret = start_consumerd(&kconsumer_data); | |
7d29a247 | 3380 | if (ret < 0) { |
54d01ffb DG |
3381 | ret = LTTCOMM_KERN_CONSUMER_FAIL; |
3382 | goto error; | |
950131af | 3383 | } |
3ff2ecac MD |
3384 | } else { |
3385 | pthread_mutex_unlock(&kconsumer_data.pid_mutex); | |
33a2b854 | 3386 | } |
0d0c377a | 3387 | } |
54d01ffb | 3388 | break; |
2bdd86d4 | 3389 | case LTTNG_DOMAIN_UST: |
44d3bd01 | 3390 | { |
44d3bd01 | 3391 | if (need_tracing_session) { |
f6a9efaa | 3392 | if (cmd_ctx->session->ust_session == NULL) { |
44d3bd01 | 3393 | ret = create_ust_session(cmd_ctx->session, |
6df2e2c9 | 3394 | &cmd_ctx->lsm->domain); |
44d3bd01 DG |
3395 | if (ret != LTTCOMM_OK) { |
3396 | goto error; | |
3397 | } | |
3398 | } | |
7753dea8 MD |
3399 | /* Start the UST consumer daemons */ |
3400 | /* 64-bit */ | |
3401 | pthread_mutex_lock(&ustconsumer64_data.pid_mutex); | |
fc7a59ce | 3402 | if (consumerd64_bin[0] != '\0' && |
7753dea8 | 3403 | ustconsumer64_data.pid == 0 && |
2bdd86d4 | 3404 | cmd_ctx->lsm->cmd_type != LTTNG_REGISTER_CONSUMER) { |
7753dea8 MD |
3405 | pthread_mutex_unlock(&ustconsumer64_data.pid_mutex); |
3406 | ret = start_consumerd(&ustconsumer64_data); | |
2bdd86d4 | 3407 | if (ret < 0) { |
7753dea8 MD |
3408 | ret = LTTCOMM_UST_CONSUMER64_FAIL; |
3409 | ust_consumerd64_fd = -EINVAL; | |
2bdd86d4 MD |
3410 | goto error; |
3411 | } | |
48842b30 | 3412 | |
7753dea8 | 3413 | ust_consumerd64_fd = ustconsumer64_data.cmd_sock; |
3ff2ecac | 3414 | } else { |
7753dea8 MD |
3415 | pthread_mutex_unlock(&ustconsumer64_data.pid_mutex); |
3416 | } | |
3417 | /* 32-bit */ | |
fc7a59ce | 3418 | if (consumerd32_bin[0] != '\0' && |
7753dea8 MD |
3419 | ustconsumer32_data.pid == 0 && |
3420 | cmd_ctx->lsm->cmd_type != LTTNG_REGISTER_CONSUMER) { | |
3421 | pthread_mutex_unlock(&ustconsumer32_data.pid_mutex); | |
3422 | ret = start_consumerd(&ustconsumer32_data); | |
3423 | if (ret < 0) { | |
3424 | ret = LTTCOMM_UST_CONSUMER32_FAIL; | |
3425 | ust_consumerd32_fd = -EINVAL; | |
3426 | goto error; | |
3427 | } | |
3428 | ust_consumerd32_fd = ustconsumer32_data.cmd_sock; | |
3429 | } else { | |
3430 | pthread_mutex_unlock(&ustconsumer32_data.pid_mutex); | |
2bdd86d4 | 3431 | } |
44d3bd01 DG |
3432 | } |
3433 | break; | |
48842b30 | 3434 | } |
54d01ffb | 3435 | default: |
54d01ffb DG |
3436 | break; |
3437 | } | |
2e09ba09 | 3438 | skip_domain: |
33a2b854 | 3439 | |
8e0af1b4 MD |
3440 | /* |
3441 | * Check that the UID or GID match that of the tracing session. | |
3442 | * The root user can interact with all sessions. | |
3443 | */ | |
3444 | if (need_tracing_session) { | |
3445 | if (!session_access_ok(cmd_ctx->session, | |
730389d9 DG |
3446 | LTTNG_SOCK_GET_UID_CRED(&cmd_ctx->creds), |
3447 | LTTNG_SOCK_GET_GID_CRED(&cmd_ctx->creds))) { | |
8e0af1b4 MD |
3448 | ret = LTTCOMM_EPERM; |
3449 | goto error; | |
3450 | } | |
3451 | } | |
3452 | ||
54d01ffb DG |
3453 | /* Process by command type */ |
3454 | switch (cmd_ctx->lsm->cmd_type) { | |
3455 | case LTTNG_ADD_CONTEXT: | |
3456 | { | |
3457 | ret = cmd_add_context(cmd_ctx->session, cmd_ctx->lsm->domain.type, | |
3458 | cmd_ctx->lsm->u.context.channel_name, | |
3459 | cmd_ctx->lsm->u.context.event_name, | |
3460 | &cmd_ctx->lsm->u.context.ctx); | |
3461 | break; | |
3462 | } | |
3463 | case LTTNG_DISABLE_CHANNEL: | |
3464 | { | |
3465 | ret = cmd_disable_channel(cmd_ctx->session, cmd_ctx->lsm->domain.type, | |
3466 | cmd_ctx->lsm->u.disable.channel_name); | |
3467 | break; | |
3468 | } | |
3469 | case LTTNG_DISABLE_EVENT: | |
3470 | { | |
3471 | ret = cmd_disable_event(cmd_ctx->session, cmd_ctx->lsm->domain.type, | |
3472 | cmd_ctx->lsm->u.disable.channel_name, | |
3473 | cmd_ctx->lsm->u.disable.name); | |
33a2b854 DG |
3474 | break; |
3475 | } | |
54d01ffb DG |
3476 | case LTTNG_DISABLE_ALL_EVENT: |
3477 | { | |
2bdd86d4 | 3478 | DBG("Disabling all events"); |
54d01ffb DG |
3479 | |
3480 | ret = cmd_disable_event_all(cmd_ctx->session, cmd_ctx->lsm->domain.type, | |
3481 | cmd_ctx->lsm->u.disable.channel_name); | |
3482 | break; | |
3483 | } | |
3484 | case LTTNG_ENABLE_CHANNEL: | |
3485 | { | |
aea829b3 | 3486 | ret = cmd_enable_channel(cmd_ctx->session, cmd_ctx->lsm->domain.type, |
54d01ffb DG |
3487 | &cmd_ctx->lsm->u.channel.chan); |
3488 | break; | |
3489 | } | |
3490 | case LTTNG_ENABLE_EVENT: | |
3491 | { | |
3492 | ret = cmd_enable_event(cmd_ctx->session, cmd_ctx->lsm->domain.type, | |
3493 | cmd_ctx->lsm->u.enable.channel_name, | |
3494 | &cmd_ctx->lsm->u.enable.event); | |
3495 | break; | |
3496 | } | |
3497 | case LTTNG_ENABLE_ALL_EVENT: | |
3498 | { | |
2bdd86d4 | 3499 | DBG("Enabling all events"); |
54d01ffb DG |
3500 | |
3501 | ret = cmd_enable_event_all(cmd_ctx->session, cmd_ctx->lsm->domain.type, | |
8c9ae521 DG |
3502 | cmd_ctx->lsm->u.enable.channel_name, |
3503 | cmd_ctx->lsm->u.enable.event.type); | |
54d01ffb DG |
3504 | break; |
3505 | } | |
052da939 | 3506 | case LTTNG_LIST_TRACEPOINTS: |
2ef84c95 | 3507 | { |
9f19cc17 | 3508 | struct lttng_event *events; |
54d01ffb | 3509 | ssize_t nb_events; |
052da939 | 3510 | |
54d01ffb DG |
3511 | nb_events = cmd_list_tracepoints(cmd_ctx->lsm->domain.type, &events); |
3512 | if (nb_events < 0) { | |
3513 | ret = -nb_events; | |
3514 | goto error; | |
2ef84c95 DG |
3515 | } |
3516 | ||
3517 | /* | |
3518 | * Setup lttng message with payload size set to the event list size in | |
3519 | * bytes and then copy list into the llm payload. | |
3520 | */ | |
052da939 | 3521 | ret = setup_lttng_msg(cmd_ctx, sizeof(struct lttng_event) * nb_events); |
2ef84c95 | 3522 | if (ret < 0) { |
052da939 | 3523 | free(events); |
2ef84c95 DG |
3524 | goto setup_error; |
3525 | } | |
3526 | ||
3527 | /* Copy event list into message payload */ | |
9f19cc17 | 3528 | memcpy(cmd_ctx->llm->payload, events, |
052da939 | 3529 | sizeof(struct lttng_event) * nb_events); |
2ef84c95 | 3530 | |
9f19cc17 | 3531 | free(events); |
2ef84c95 DG |
3532 | |
3533 | ret = LTTCOMM_OK; | |
3534 | break; | |
3535 | } | |
f3ed775e | 3536 | case LTTNG_START_TRACE: |
8c0faa1d | 3537 | { |
54d01ffb | 3538 | ret = cmd_start_trace(cmd_ctx->session); |
8c0faa1d DG |
3539 | break; |
3540 | } | |
f3ed775e | 3541 | case LTTNG_STOP_TRACE: |
8c0faa1d | 3542 | { |
54d01ffb | 3543 | ret = cmd_stop_trace(cmd_ctx->session); |
8c0faa1d DG |
3544 | break; |
3545 | } | |
5e16da05 MD |
3546 | case LTTNG_CREATE_SESSION: |
3547 | { | |
54d01ffb | 3548 | ret = cmd_create_session(cmd_ctx->lsm->session.name, |
6df2e2c9 | 3549 | cmd_ctx->lsm->session.path, &cmd_ctx->creds); |
5e16da05 MD |
3550 | break; |
3551 | } | |
3552 | case LTTNG_DESTROY_SESSION: | |
3553 | { | |
54d01ffb DG |
3554 | ret = cmd_destroy_session(cmd_ctx->session, |
3555 | cmd_ctx->lsm->session.name); | |
256a5576 MD |
3556 | /* |
3557 | * Set session to NULL so we do not unlock it after | |
3558 | * free. | |
3559 | */ | |
3560 | cmd_ctx->session = NULL; | |
5461b305 | 3561 | break; |
5e16da05 | 3562 | } |
9f19cc17 | 3563 | case LTTNG_LIST_DOMAINS: |
5e16da05 | 3564 | { |
54d01ffb DG |
3565 | ssize_t nb_dom; |
3566 | struct lttng_domain *domains; | |
5461b305 | 3567 | |
54d01ffb DG |
3568 | nb_dom = cmd_list_domains(cmd_ctx->session, &domains); |
3569 | if (nb_dom < 0) { | |
3570 | ret = -nb_dom; | |
3571 | goto error; | |
ce3d728c | 3572 | } |
520ff687 | 3573 | |
54d01ffb | 3574 | ret = setup_lttng_msg(cmd_ctx, nb_dom * sizeof(struct lttng_domain)); |
5461b305 DG |
3575 | if (ret < 0) { |
3576 | goto setup_error; | |
520ff687 | 3577 | } |
57167058 | 3578 | |
54d01ffb DG |
3579 | /* Copy event list into message payload */ |
3580 | memcpy(cmd_ctx->llm->payload, domains, | |
3581 | nb_dom * sizeof(struct lttng_domain)); | |
3582 | ||
3583 | free(domains); | |
5e16da05 | 3584 | |
5461b305 | 3585 | ret = LTTCOMM_OK; |
5e16da05 MD |
3586 | break; |
3587 | } | |
9f19cc17 | 3588 | case LTTNG_LIST_CHANNELS: |
5e16da05 | 3589 | { |
54d01ffb DG |
3590 | size_t nb_chan; |
3591 | struct lttng_channel *channels; | |
3592 | ||
b551a063 DG |
3593 | nb_chan = cmd_list_channels(cmd_ctx->lsm->domain.type, |
3594 | cmd_ctx->session, &channels); | |
54d01ffb DG |
3595 | if (nb_chan < 0) { |
3596 | ret = -nb_chan; | |
3597 | goto error; | |
5461b305 | 3598 | } |
ca95a216 | 3599 | |
54d01ffb | 3600 | ret = setup_lttng_msg(cmd_ctx, nb_chan * sizeof(struct lttng_channel)); |
5461b305 DG |
3601 | if (ret < 0) { |
3602 | goto setup_error; | |
3603 | } | |
9f19cc17 | 3604 | |
54d01ffb DG |
3605 | /* Copy event list into message payload */ |
3606 | memcpy(cmd_ctx->llm->payload, channels, | |
3607 | nb_chan * sizeof(struct lttng_channel)); | |
3608 | ||
3609 | free(channels); | |
9f19cc17 DG |
3610 | |
3611 | ret = LTTCOMM_OK; | |
5461b305 | 3612 | break; |
5e16da05 | 3613 | } |
9f19cc17 | 3614 | case LTTNG_LIST_EVENTS: |
5e16da05 | 3615 | { |
b551a063 | 3616 | ssize_t nb_event; |
684d34d2 | 3617 | struct lttng_event *events = NULL; |
9f19cc17 | 3618 | |
b551a063 | 3619 | nb_event = cmd_list_events(cmd_ctx->lsm->domain.type, cmd_ctx->session, |
54d01ffb DG |
3620 | cmd_ctx->lsm->u.list.channel_name, &events); |
3621 | if (nb_event < 0) { | |
3622 | ret = -nb_event; | |
3623 | goto error; | |
5461b305 | 3624 | } |
ca95a216 | 3625 | |
54d01ffb | 3626 | ret = setup_lttng_msg(cmd_ctx, nb_event * sizeof(struct lttng_event)); |
5461b305 DG |
3627 | if (ret < 0) { |
3628 | goto setup_error; | |
3629 | } | |
9f19cc17 | 3630 | |
54d01ffb DG |
3631 | /* Copy event list into message payload */ |
3632 | memcpy(cmd_ctx->llm->payload, events, | |
3633 | nb_event * sizeof(struct lttng_event)); | |
9f19cc17 | 3634 | |
54d01ffb | 3635 | free(events); |
9f19cc17 DG |
3636 | |
3637 | ret = LTTCOMM_OK; | |
5461b305 | 3638 | break; |
5e16da05 MD |
3639 | } |
3640 | case LTTNG_LIST_SESSIONS: | |
3641 | { | |
8e0af1b4 | 3642 | unsigned int nr_sessions; |
5461b305 | 3643 | |
8e0af1b4 | 3644 | session_lock_list(); |
730389d9 DG |
3645 | nr_sessions = lttng_sessions_count( |
3646 | LTTNG_SOCK_GET_UID_CRED(&cmd_ctx->creds), | |
3647 | LTTNG_SOCK_GET_GID_CRED(&cmd_ctx->creds)); | |
d32fb093 | 3648 | |
8e0af1b4 | 3649 | ret = setup_lttng_msg(cmd_ctx, sizeof(struct lttng_session) * nr_sessions); |
5461b305 | 3650 | if (ret < 0) { |
54d01ffb | 3651 | session_unlock_list(); |
5461b305 | 3652 | goto setup_error; |
e065084a | 3653 | } |
5e16da05 | 3654 | |
6c9cc2ab | 3655 | /* Filled the session array */ |
8e0af1b4 | 3656 | list_lttng_sessions((struct lttng_session *)(cmd_ctx->llm->payload), |
730389d9 DG |
3657 | LTTNG_SOCK_GET_UID_CRED(&cmd_ctx->creds), |
3658 | LTTNG_SOCK_GET_GID_CRED(&cmd_ctx->creds)); | |
6c9cc2ab | 3659 | |
54d01ffb | 3660 | session_unlock_list(); |
5e16da05 | 3661 | |
5461b305 | 3662 | ret = LTTCOMM_OK; |
5e16da05 MD |
3663 | break; |
3664 | } | |
d0254c7c MD |
3665 | case LTTNG_CALIBRATE: |
3666 | { | |
54d01ffb DG |
3667 | ret = cmd_calibrate(cmd_ctx->lsm->domain.type, |
3668 | &cmd_ctx->lsm->u.calibrate); | |
d0254c7c MD |
3669 | break; |
3670 | } | |
d9800920 DG |
3671 | case LTTNG_REGISTER_CONSUMER: |
3672 | { | |
54d01ffb DG |
3673 | ret = cmd_register_consumer(cmd_ctx->session, cmd_ctx->lsm->domain.type, |
3674 | cmd_ctx->lsm->u.reg.path); | |
d9800920 DG |
3675 | break; |
3676 | } | |
5e16da05 | 3677 | default: |
5e16da05 | 3678 | ret = LTTCOMM_UND; |
5461b305 | 3679 | break; |
fac6795d DG |
3680 | } |
3681 | ||
5461b305 | 3682 | error: |
5461b305 DG |
3683 | if (cmd_ctx->llm == NULL) { |
3684 | DBG("Missing llm structure. Allocating one."); | |
894be886 | 3685 | if (setup_lttng_msg(cmd_ctx, 0) < 0) { |
5461b305 DG |
3686 | goto setup_error; |
3687 | } | |
3688 | } | |
54d01ffb | 3689 | /* Set return code */ |
5461b305 | 3690 | cmd_ctx->llm->ret_code = ret; |
5461b305 | 3691 | setup_error: |
b5541356 | 3692 | if (cmd_ctx->session) { |
54d01ffb | 3693 | session_unlock(cmd_ctx->session); |
b5541356 | 3694 | } |
256a5576 MD |
3695 | if (need_tracing_session) { |
3696 | session_unlock_list(); | |
3697 | } | |
54d01ffb | 3698 | init_setup_error: |
8028d920 | 3699 | return ret; |
fac6795d DG |
3700 | } |
3701 | ||
1d4b027a | 3702 | /* |
d063d709 DG |
3703 | * This thread manage all clients request using the unix client socket for |
3704 | * communication. | |
1d4b027a DG |
3705 | */ |
3706 | static void *thread_manage_clients(void *data) | |
3707 | { | |
a4b35e07 | 3708 | int sock = -1, ret, i, pollfd; |
5eb91c98 | 3709 | uint32_t revents, nb_fd; |
273ea72c | 3710 | struct command_ctx *cmd_ctx = NULL; |
5eb91c98 | 3711 | struct lttng_poll_event events; |
1d4b027a DG |
3712 | |
3713 | DBG("[thread] Manage client started"); | |
3714 | ||
f6a9efaa DG |
3715 | rcu_register_thread(); |
3716 | ||
1d4b027a DG |
3717 | ret = lttcomm_listen_unix_sock(client_sock); |
3718 | if (ret < 0) { | |
3719 | goto error; | |
3720 | } | |
3721 | ||
5eb91c98 DG |
3722 | /* |
3723 | * Pass 2 as size here for the thread quit pipe and client_sock. Nothing | |
3724 | * more will be added to this poll set. | |
3725 | */ | |
3726 | ret = create_thread_poll_set(&events, 2); | |
3727 | if (ret < 0) { | |
3728 | goto error; | |
3729 | } | |
273ea72c | 3730 | |
5eb91c98 DG |
3731 | /* Add the application registration socket */ |
3732 | ret = lttng_poll_add(&events, client_sock, LPOLLIN | LPOLLPRI); | |
3733 | if (ret < 0) { | |
3734 | goto error; | |
3735 | } | |
273ea72c | 3736 | |
bbd973c2 DG |
3737 | /* |
3738 | * Notify parent pid that we are ready to accept command for client side. | |
1d4b027a DG |
3739 | */ |
3740 | if (opt_sig_parent) { | |
8db8d1dc | 3741 | kill(ppid, SIGUSR1); |
1d4b027a DG |
3742 | } |
3743 | ||
3744 | while (1) { | |
1d4b027a | 3745 | DBG("Accepting client command ..."); |
273ea72c | 3746 | |
5eb91c98 DG |
3747 | nb_fd = LTTNG_POLL_GETNB(&events); |
3748 | ||
273ea72c | 3749 | /* Inifinite blocking call, waiting for transmission */ |
88f2b785 | 3750 | restart: |
5eb91c98 | 3751 | ret = lttng_poll_wait(&events, -1); |
273ea72c | 3752 | if (ret < 0) { |
88f2b785 MD |
3753 | /* |
3754 | * Restart interrupted system call. | |
3755 | */ | |
3756 | if (errno == EINTR) { | |
3757 | goto restart; | |
3758 | } | |
273ea72c DG |
3759 | goto error; |
3760 | } | |
3761 | ||
5eb91c98 DG |
3762 | for (i = 0; i < nb_fd; i++) { |
3763 | /* Fetch once the poll data */ | |
3764 | revents = LTTNG_POLL_GETEV(&events, i); | |
3765 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
3766 | ||
3767 | /* Thread quit pipe has been closed. Killing thread. */ | |
3768 | ret = check_thread_quit_pipe(pollfd, revents); | |
3769 | if (ret) { | |
3770 | goto error; | |
3771 | } | |
3772 | ||
3773 | /* Event on the registration socket */ | |
3774 | if (pollfd == client_sock) { | |
3775 | if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { | |
3776 | ERR("Client socket poll error"); | |
3777 | goto error; | |
3778 | } | |
3779 | } | |
3780 | } | |
3781 | ||
3782 | DBG("Wait for client response"); | |
3783 | ||
3784 | sock = lttcomm_accept_unix_sock(client_sock); | |
3785 | if (sock < 0) { | |
273ea72c | 3786 | goto error; |
273ea72c DG |
3787 | } |
3788 | ||
be040666 DG |
3789 | /* Set socket option for credentials retrieval */ |
3790 | ret = lttcomm_setsockopt_creds_unix_sock(sock); | |
3791 | if (ret < 0) { | |
3792 | goto error; | |
3793 | } | |
3794 | ||
5eb91c98 | 3795 | /* Allocate context command to process the client request */ |
ba7f0ae5 | 3796 | cmd_ctx = zmalloc(sizeof(struct command_ctx)); |
5eb91c98 | 3797 | if (cmd_ctx == NULL) { |
76d7553f | 3798 | PERROR("zmalloc cmd_ctx"); |
1d4b027a | 3799 | goto error; |
5eb91c98 | 3800 | } |
1d4b027a | 3801 | |
5eb91c98 | 3802 | /* Allocate data buffer for reception */ |
ba7f0ae5 | 3803 | cmd_ctx->lsm = zmalloc(sizeof(struct lttcomm_session_msg)); |
5eb91c98 | 3804 | if (cmd_ctx->lsm == NULL) { |
76d7553f | 3805 | PERROR("zmalloc cmd_ctx->lsm"); |
5eb91c98 DG |
3806 | goto error; |
3807 | } | |
1d4b027a | 3808 | |
5eb91c98 DG |
3809 | cmd_ctx->llm = NULL; |
3810 | cmd_ctx->session = NULL; | |
1d4b027a | 3811 | |
5eb91c98 DG |
3812 | /* |
3813 | * Data is received from the lttng client. The struct | |
3814 | * lttcomm_session_msg (lsm) contains the command and data request of | |
3815 | * the client. | |
3816 | */ | |
3817 | DBG("Receiving data from client ..."); | |
be040666 DG |
3818 | ret = lttcomm_recv_creds_unix_sock(sock, cmd_ctx->lsm, |
3819 | sizeof(struct lttcomm_session_msg), &cmd_ctx->creds); | |
5eb91c98 DG |
3820 | if (ret <= 0) { |
3821 | DBG("Nothing recv() from client... continuing"); | |
76d7553f MD |
3822 | ret = close(sock); |
3823 | if (ret) { | |
3824 | PERROR("close"); | |
3825 | } | |
3826 | sock = -1; | |
a2c0da86 | 3827 | clean_command_ctx(&cmd_ctx); |
5eb91c98 DG |
3828 | continue; |
3829 | } | |
1d4b027a | 3830 | |
5eb91c98 DG |
3831 | // TODO: Validate cmd_ctx including sanity check for |
3832 | // security purpose. | |
f7776ea7 | 3833 | |
f6a9efaa | 3834 | rcu_thread_online(); |
5eb91c98 DG |
3835 | /* |
3836 | * This function dispatch the work to the kernel or userspace tracer | |
3837 | * libs and fill the lttcomm_lttng_msg data structure of all the needed | |
3838 | * informations for the client. The command context struct contains | |
3839 | * everything this function may needs. | |
3840 | */ | |
3841 | ret = process_client_msg(cmd_ctx); | |
f6a9efaa | 3842 | rcu_thread_offline(); |
5eb91c98 | 3843 | if (ret < 0) { |
bbd973c2 | 3844 | /* |
5eb91c98 | 3845 | * TODO: Inform client somehow of the fatal error. At |
ba7f0ae5 | 3846 | * this point, ret < 0 means that a zmalloc failed |
5eb91c98 | 3847 | * (ENOMEM). Error detected but still accept command. |
bbd973c2 | 3848 | */ |
bbd973c2 | 3849 | clean_command_ctx(&cmd_ctx); |
5eb91c98 DG |
3850 | continue; |
3851 | } | |
d6e4fca4 | 3852 | |
54d01ffb DG |
3853 | DBG("Sending response (size: %d, retcode: %s)", |
3854 | cmd_ctx->lttng_msg_size, | |
9a745bc7 | 3855 | lttng_strerror(-cmd_ctx->llm->ret_code)); |
54d01ffb | 3856 | ret = send_unix_sock(sock, cmd_ctx->llm, cmd_ctx->lttng_msg_size); |
5eb91c98 DG |
3857 | if (ret < 0) { |
3858 | ERR("Failed to send data back to client"); | |
bbd973c2 | 3859 | } |
1d4b027a | 3860 | |
5eb91c98 | 3861 | /* End of transmission */ |
76d7553f MD |
3862 | ret = close(sock); |
3863 | if (ret) { | |
3864 | PERROR("close"); | |
3865 | } | |
3866 | sock = -1; | |
be040666 DG |
3867 | |
3868 | clean_command_ctx(&cmd_ctx); | |
273ea72c DG |
3869 | } |
3870 | ||
5eb91c98 DG |
3871 | error: |
3872 | DBG("Client thread dying"); | |
273ea72c | 3873 | unlink(client_unix_sock_path); |
76d7553f MD |
3874 | if (client_sock >= 0) { |
3875 | ret = close(client_sock); | |
3876 | if (ret) { | |
3877 | PERROR("close"); | |
3878 | } | |
a4b35e07 MD |
3879 | } |
3880 | if (sock >= 0) { | |
76d7553f MD |
3881 | ret = close(sock); |
3882 | if (ret) { | |
3883 | PERROR("close"); | |
3884 | } | |
a4b35e07 | 3885 | } |
273ea72c | 3886 | |
5eb91c98 | 3887 | lttng_poll_clean(&events); |
a2fb29a5 | 3888 | clean_command_ctx(&cmd_ctx); |
f6a9efaa DG |
3889 | |
3890 | rcu_unregister_thread(); | |
1d4b027a DG |
3891 | return NULL; |
3892 | } | |
3893 | ||
3894 | ||
fac6795d DG |
3895 | /* |
3896 | * usage function on stderr | |
3897 | */ | |
3898 | static void usage(void) | |
3899 | { | |
b716ce68 | 3900 | fprintf(stderr, "Usage: %s OPTIONS\n\nOptions:\n", progname); |
d6f42150 DG |
3901 | fprintf(stderr, " -h, --help Display this usage.\n"); |
3902 | fprintf(stderr, " -c, --client-sock PATH Specify path for the client unix socket\n"); | |
3903 | fprintf(stderr, " -a, --apps-sock PATH Specify path for apps unix socket\n"); | |
3904 | fprintf(stderr, " --kconsumerd-err-sock PATH Specify path for the kernel consumer error socket\n"); | |
3905 | fprintf(stderr, " --kconsumerd-cmd-sock PATH Specify path for the kernel consumer command socket\n"); | |
7753dea8 MD |
3906 | fprintf(stderr, " --ustconsumerd32-err-sock PATH Specify path for the 32-bit UST consumer error socket\n"); |
3907 | fprintf(stderr, " --ustconsumerd64-err-sock PATH Specify path for the 64-bit UST consumer error socket\n"); | |
3908 | fprintf(stderr, " --ustconsumerd32-cmd-sock PATH Specify path for the 32-bit UST consumer command socket\n"); | |
3909 | fprintf(stderr, " --ustconsumerd64-cmd-sock PATH Specify path for the 64-bit UST consumer command socket\n"); | |
ebaeda94 MD |
3910 | fprintf(stderr, " --consumerd32-path PATH Specify path for the 32-bit UST consumer daemon binary\n"); |
3911 | fprintf(stderr, " --consumerd32-libdir PATH Specify path for the 32-bit UST consumer daemon libraries\n"); | |
3912 | fprintf(stderr, " --consumerd64-path PATH Specify path for the 64-bit UST consumer daemon binary\n"); | |
3913 | fprintf(stderr, " --consumerd64-libdir PATH Specify path for the 64-bit UST consumer daemon libraries\n"); | |
d6f42150 DG |
3914 | fprintf(stderr, " -d, --daemonize Start as a daemon.\n"); |
3915 | fprintf(stderr, " -g, --group NAME Specify the tracing group name. (default: tracing)\n"); | |
3916 | fprintf(stderr, " -V, --version Show version number.\n"); | |
3917 | fprintf(stderr, " -S, --sig-parent Send SIGCHLD to parent pid to notify readiness.\n"); | |
3918 | fprintf(stderr, " -q, --quiet No output at all.\n"); | |
3919 | fprintf(stderr, " -v, --verbose Verbose mode. Activate DBG() macro.\n"); | |
3bd1e081 | 3920 | fprintf(stderr, " --verbose-consumer Verbose mode for consumer. Activate DBG() macro.\n"); |
4fba7219 | 3921 | fprintf(stderr, " --no-kernel Disable kernel tracer\n"); |
fac6795d DG |
3922 | } |
3923 | ||
3924 | /* | |
3925 | * daemon argument parsing | |
3926 | */ | |
3927 | static int parse_args(int argc, char **argv) | |
3928 | { | |
3929 | int c; | |
3930 | ||
3931 | static struct option long_options[] = { | |
3932 | { "client-sock", 1, 0, 'c' }, | |
3933 | { "apps-sock", 1, 0, 'a' }, | |
3bd1e081 MD |
3934 | { "kconsumerd-cmd-sock", 1, 0, 'C' }, |
3935 | { "kconsumerd-err-sock", 1, 0, 'E' }, | |
7753dea8 MD |
3936 | { "ustconsumerd32-cmd-sock", 1, 0, 'G' }, |
3937 | { "ustconsumerd32-err-sock", 1, 0, 'H' }, | |
ebaeda94 MD |
3938 | { "ustconsumerd64-cmd-sock", 1, 0, 'D' }, |
3939 | { "ustconsumerd64-err-sock", 1, 0, 'F' }, | |
3940 | { "consumerd32-path", 1, 0, 'u' }, | |
3941 | { "consumerd32-libdir", 1, 0, 'U' }, | |
3942 | { "consumerd64-path", 1, 0, 't' }, | |
3943 | { "consumerd64-libdir", 1, 0, 'T' }, | |
fac6795d | 3944 | { "daemonize", 0, 0, 'd' }, |
5b8719f5 | 3945 | { "sig-parent", 0, 0, 'S' }, |
fac6795d DG |
3946 | { "help", 0, 0, 'h' }, |
3947 | { "group", 1, 0, 'g' }, | |
3948 | { "version", 0, 0, 'V' }, | |
75462a81 | 3949 | { "quiet", 0, 0, 'q' }, |
3f9947db | 3950 | { "verbose", 0, 0, 'v' }, |
3bd1e081 | 3951 | { "verbose-consumer", 0, 0, 'Z' }, |
4fba7219 | 3952 | { "no-kernel", 0, 0, 'N' }, |
fac6795d DG |
3953 | { NULL, 0, 0, 0 } |
3954 | }; | |
3955 | ||
3956 | while (1) { | |
3957 | int option_index = 0; | |
4fba7219 | 3958 | c = getopt_long(argc, argv, "dhqvVSN" "a:c:g:s:C:E:D:F:Z:u:t", |
54d01ffb | 3959 | long_options, &option_index); |
fac6795d DG |
3960 | if (c == -1) { |
3961 | break; | |
3962 | } | |
3963 | ||
3964 | switch (c) { | |
3965 | case 0: | |
3966 | fprintf(stderr, "option %s", long_options[option_index].name); | |
3967 | if (optarg) { | |
3968 | fprintf(stderr, " with arg %s\n", optarg); | |
3969 | } | |
3970 | break; | |
b716ce68 | 3971 | case 'c': |
fac6795d DG |
3972 | snprintf(client_unix_sock_path, PATH_MAX, "%s", optarg); |
3973 | break; | |
3974 | case 'a': | |
3975 | snprintf(apps_unix_sock_path, PATH_MAX, "%s", optarg); | |
3976 | break; | |
3977 | case 'd': | |
3978 | opt_daemon = 1; | |
3979 | break; | |
3980 | case 'g': | |
fb09408a | 3981 | opt_tracing_group = optarg; |
fac6795d DG |
3982 | break; |
3983 | case 'h': | |
3984 | usage(); | |
3985 | exit(EXIT_FAILURE); | |
3986 | case 'V': | |
3987 | fprintf(stdout, "%s\n", VERSION); | |
3988 | exit(EXIT_SUCCESS); | |
5b8719f5 DG |
3989 | case 'S': |
3990 | opt_sig_parent = 1; | |
3991 | break; | |
d6f42150 | 3992 | case 'E': |
3bd1e081 | 3993 | snprintf(kconsumer_data.err_unix_sock_path, PATH_MAX, "%s", optarg); |
d6f42150 DG |
3994 | break; |
3995 | case 'C': | |
3bd1e081 MD |
3996 | snprintf(kconsumer_data.cmd_unix_sock_path, PATH_MAX, "%s", optarg); |
3997 | break; | |
3998 | case 'F': | |
7753dea8 | 3999 | snprintf(ustconsumer64_data.err_unix_sock_path, PATH_MAX, "%s", optarg); |
3bd1e081 MD |
4000 | break; |
4001 | case 'D': | |
7753dea8 MD |
4002 | snprintf(ustconsumer64_data.cmd_unix_sock_path, PATH_MAX, "%s", optarg); |
4003 | break; | |
4004 | case 'H': | |
4005 | snprintf(ustconsumer32_data.err_unix_sock_path, PATH_MAX, "%s", optarg); | |
4006 | break; | |
4007 | case 'G': | |
4008 | snprintf(ustconsumer32_data.cmd_unix_sock_path, PATH_MAX, "%s", optarg); | |
d6f42150 | 4009 | break; |
4fba7219 DG |
4010 | case 'N': |
4011 | opt_no_kernel = 1; | |
4012 | break; | |
75462a81 | 4013 | case 'q': |
97e19046 | 4014 | lttng_opt_quiet = 1; |
75462a81 | 4015 | break; |
3f9947db | 4016 | case 'v': |
53086306 | 4017 | /* Verbose level can increase using multiple -v */ |
97e19046 | 4018 | lttng_opt_verbose += 1; |
3f9947db | 4019 | break; |
31f73cc9 | 4020 | case 'Z': |
3bd1e081 | 4021 | opt_verbose_consumer += 1; |
31f73cc9 | 4022 | break; |
fb09408a | 4023 | case 'u': |
fc7a59ce | 4024 | consumerd32_bin= optarg; |
ebaeda94 MD |
4025 | break; |
4026 | case 'U': | |
4027 | consumerd32_libdir = optarg; | |
7753dea8 MD |
4028 | break; |
4029 | case 't': | |
fc7a59ce | 4030 | consumerd64_bin = optarg; |
ebaeda94 MD |
4031 | break; |
4032 | case 'T': | |
4033 | consumerd64_libdir = optarg; | |
fb09408a | 4034 | break; |
fac6795d DG |
4035 | default: |
4036 | /* Unknown option or other error. | |
4037 | * Error is printed by getopt, just return */ | |
4038 | return -1; | |
4039 | } | |
4040 | } | |
4041 | ||
4042 | return 0; | |
4043 | } | |
4044 | ||
4045 | /* | |
d063d709 | 4046 | * Creates the two needed socket by the daemon. |
d6f42150 DG |
4047 | * apps_sock - The communication socket for all UST apps. |
4048 | * client_sock - The communication of the cli tool (lttng). | |
fac6795d | 4049 | */ |
cf3af59e | 4050 | static int init_daemon_socket(void) |
fac6795d DG |
4051 | { |
4052 | int ret = 0; | |
4053 | mode_t old_umask; | |
4054 | ||
4055 | old_umask = umask(0); | |
4056 | ||
4057 | /* Create client tool unix socket */ | |
d6f42150 DG |
4058 | client_sock = lttcomm_create_unix_sock(client_unix_sock_path); |
4059 | if (client_sock < 0) { | |
4060 | ERR("Create unix sock failed: %s", client_unix_sock_path); | |
fac6795d DG |
4061 | ret = -1; |
4062 | goto end; | |
4063 | } | |
4064 | ||
4065 | /* File permission MUST be 660 */ | |
4066 | ret = chmod(client_unix_sock_path, S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP); | |
4067 | if (ret < 0) { | |
d6f42150 | 4068 | ERR("Set file permissions failed: %s", client_unix_sock_path); |
76d7553f | 4069 | PERROR("chmod"); |
fac6795d DG |
4070 | goto end; |
4071 | } | |
4072 | ||
4073 | /* Create the application unix socket */ | |
d6f42150 DG |
4074 | apps_sock = lttcomm_create_unix_sock(apps_unix_sock_path); |
4075 | if (apps_sock < 0) { | |
4076 | ERR("Create unix sock failed: %s", apps_unix_sock_path); | |
fac6795d DG |
4077 | ret = -1; |
4078 | goto end; | |
4079 | } | |
4080 | ||
d6f42150 | 4081 | /* File permission MUST be 666 */ |
54d01ffb DG |
4082 | ret = chmod(apps_unix_sock_path, |
4083 | S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IROTH | S_IWOTH); | |
fac6795d | 4084 | if (ret < 0) { |
d6f42150 | 4085 | ERR("Set file permissions failed: %s", apps_unix_sock_path); |
76d7553f | 4086 | PERROR("chmod"); |
fac6795d DG |
4087 | goto end; |
4088 | } | |
4089 | ||
4090 | end: | |
4091 | umask(old_umask); | |
4092 | return ret; | |
4093 | } | |
4094 | ||
4095 | /* | |
54d01ffb DG |
4096 | * Check if the global socket is available, and if a daemon is answering at the |
4097 | * other side. If yes, error is returned. | |
fac6795d | 4098 | */ |
cf3af59e | 4099 | static int check_existing_daemon(void) |
fac6795d | 4100 | { |
7d8234d9 | 4101 | /* Is there anybody out there ? */ |
099e26bd | 4102 | if (lttng_session_daemon_alive()) { |
7d8234d9 | 4103 | return -EEXIST; |
099e26bd | 4104 | } |
b09c7c76 DG |
4105 | |
4106 | return 0; | |
fac6795d DG |
4107 | } |
4108 | ||
fac6795d | 4109 | /* |
d063d709 | 4110 | * Set the tracing group gid onto the client socket. |
5e16da05 | 4111 | * |
d063d709 | 4112 | * Race window between mkdir and chown is OK because we are going from more |
d1613cf5 | 4113 | * permissive (root.root) to less permissive (root.tracing). |
fac6795d | 4114 | */ |
be040666 | 4115 | static int set_permissions(char *rundir) |
fac6795d DG |
4116 | { |
4117 | int ret; | |
996b65c8 | 4118 | gid_t gid; |
fac6795d | 4119 | |
996b65c8 MD |
4120 | gid = allowed_group(); |
4121 | if (gid < 0) { | |
be040666 DG |
4122 | WARN("No tracing group detected"); |
4123 | ret = 0; | |
fac6795d DG |
4124 | goto end; |
4125 | } | |
4126 | ||
d6f42150 | 4127 | /* Set lttng run dir */ |
be040666 | 4128 | ret = chown(rundir, 0, gid); |
d6f42150 | 4129 | if (ret < 0) { |
be040666 | 4130 | ERR("Unable to set group on %s", rundir); |
76d7553f | 4131 | PERROR("chown"); |
d6f42150 DG |
4132 | } |
4133 | ||
d1613cf5 | 4134 | /* Ensure tracing group can search the run dir */ |
61076f74 | 4135 | ret = chmod(rundir, S_IRWXU | S_IXGRP | S_IXOTH); |
d1613cf5 JN |
4136 | if (ret < 0) { |
4137 | ERR("Unable to set permissions on %s", rundir); | |
76d7553f | 4138 | PERROR("chmod"); |
d1613cf5 JN |
4139 | } |
4140 | ||
d6f42150 | 4141 | /* lttng client socket path */ |
996b65c8 | 4142 | ret = chown(client_unix_sock_path, 0, gid); |
fac6795d | 4143 | if (ret < 0) { |
d6f42150 | 4144 | ERR("Unable to set group on %s", client_unix_sock_path); |
76d7553f | 4145 | PERROR("chown"); |
d6f42150 DG |
4146 | } |
4147 | ||
3bd1e081 MD |
4148 | /* kconsumer error socket path */ |
4149 | ret = chown(kconsumer_data.err_unix_sock_path, 0, gid); | |
d6f42150 | 4150 | if (ret < 0) { |
3bd1e081 | 4151 | ERR("Unable to set group on %s", kconsumer_data.err_unix_sock_path); |
76d7553f | 4152 | PERROR("chown"); |
3bd1e081 MD |
4153 | } |
4154 | ||
7753dea8 MD |
4155 | /* 64-bit ustconsumer error socket path */ |
4156 | ret = chown(ustconsumer64_data.err_unix_sock_path, 0, gid); | |
4157 | if (ret < 0) { | |
4158 | ERR("Unable to set group on %s", ustconsumer64_data.err_unix_sock_path); | |
76d7553f | 4159 | PERROR("chown"); |
7753dea8 MD |
4160 | } |
4161 | ||
4162 | /* 32-bit ustconsumer compat32 error socket path */ | |
4163 | ret = chown(ustconsumer32_data.err_unix_sock_path, 0, gid); | |
3bd1e081 | 4164 | if (ret < 0) { |
7753dea8 | 4165 | ERR("Unable to set group on %s", ustconsumer32_data.err_unix_sock_path); |
76d7553f | 4166 | PERROR("chown"); |
fac6795d DG |
4167 | } |
4168 | ||
d6f42150 | 4169 | DBG("All permissions are set"); |
e07ae692 | 4170 | |
fac6795d DG |
4171 | end: |
4172 | return ret; | |
4173 | } | |
4174 | ||
7a485870 | 4175 | /* |
d063d709 | 4176 | * Create the pipe used to wake up the kernel thread. |
76d7553f | 4177 | * Closed in cleanup(). |
7a485870 DG |
4178 | */ |
4179 | static int create_kernel_poll_pipe(void) | |
4180 | { | |
730389d9 DG |
4181 | int ret, i; |
4182 | ||
4183 | ret = pipe(kernel_poll_pipe); | |
4184 | if (ret < 0) { | |
4185 | PERROR("kernel poll pipe"); | |
4186 | goto error; | |
4187 | } | |
4188 | ||
4189 | for (i = 0; i < 2; i++) { | |
4190 | ret = fcntl(kernel_poll_pipe[i], F_SETFD, FD_CLOEXEC); | |
4191 | if (ret < 0) { | |
4192 | PERROR("fcntl kernel_poll_pipe"); | |
4193 | goto error; | |
4194 | } | |
4195 | } | |
4196 | ||
4197 | error: | |
4198 | return ret; | |
7a485870 DG |
4199 | } |
4200 | ||
099e26bd DG |
4201 | /* |
4202 | * Create the application command pipe to wake thread_manage_apps. | |
76d7553f | 4203 | * Closed in cleanup(). |
099e26bd DG |
4204 | */ |
4205 | static int create_apps_cmd_pipe(void) | |
4206 | { | |
730389d9 DG |
4207 | int ret, i; |
4208 | ||
4209 | ret = pipe(apps_cmd_pipe); | |
4210 | if (ret < 0) { | |
4211 | PERROR("apps cmd pipe"); | |
4212 | goto error; | |
4213 | } | |
4214 | ||
4215 | for (i = 0; i < 2; i++) { | |
4216 | ret = fcntl(apps_cmd_pipe[i], F_SETFD, FD_CLOEXEC); | |
4217 | if (ret < 0) { | |
4218 | PERROR("fcntl apps_cmd_pipe"); | |
4219 | goto error; | |
4220 | } | |
4221 | } | |
4222 | ||
4223 | error: | |
4224 | return ret; | |
099e26bd DG |
4225 | } |
4226 | ||
d6f42150 | 4227 | /* |
d063d709 | 4228 | * Create the lttng run directory needed for all global sockets and pipe. |
d6f42150 | 4229 | */ |
67e40797 | 4230 | static int create_lttng_rundir(const char *rundir) |
d6f42150 DG |
4231 | { |
4232 | int ret; | |
4233 | ||
67e40797 DG |
4234 | DBG3("Creating LTTng run directory: %s", rundir); |
4235 | ||
d1613cf5 | 4236 | ret = mkdir(rundir, S_IRWXU); |
d6f42150 | 4237 | if (ret < 0) { |
b1f11e69 | 4238 | if (errno != EEXIST) { |
67e40797 | 4239 | ERR("Unable to create %s", rundir); |
b1f11e69 DG |
4240 | goto error; |
4241 | } else { | |
4242 | ret = 0; | |
4243 | } | |
d6f42150 DG |
4244 | } |
4245 | ||
4246 | error: | |
4247 | return ret; | |
4248 | } | |
4249 | ||
4250 | /* | |
d063d709 DG |
4251 | * Setup sockets and directory needed by the kconsumerd communication with the |
4252 | * session daemon. | |
d6f42150 | 4253 | */ |
67e40797 DG |
4254 | static int set_consumer_sockets(struct consumer_data *consumer_data, |
4255 | const char *rundir) | |
d6f42150 DG |
4256 | { |
4257 | int ret; | |
67e40797 | 4258 | char path[PATH_MAX]; |
d6f42150 | 4259 | |
67e40797 | 4260 | switch (consumer_data->type) { |
7753dea8 | 4261 | case LTTNG_CONSUMER_KERNEL: |
60922cb0 | 4262 | snprintf(path, PATH_MAX, DEFAULT_KCONSUMERD_PATH, rundir); |
7753dea8 MD |
4263 | break; |
4264 | case LTTNG_CONSUMER64_UST: | |
60922cb0 | 4265 | snprintf(path, PATH_MAX, DEFAULT_USTCONSUMERD64_PATH, rundir); |
7753dea8 MD |
4266 | break; |
4267 | case LTTNG_CONSUMER32_UST: | |
60922cb0 | 4268 | snprintf(path, PATH_MAX, DEFAULT_USTCONSUMERD32_PATH, rundir); |
7753dea8 MD |
4269 | break; |
4270 | default: | |
4271 | ERR("Consumer type unknown"); | |
4272 | ret = -EINVAL; | |
4273 | goto error; | |
d6f42150 DG |
4274 | } |
4275 | ||
67e40797 DG |
4276 | DBG2("Creating consumer directory: %s", path); |
4277 | ||
d1613cf5 | 4278 | ret = mkdir(path, S_IRWXU); |
d6f42150 | 4279 | if (ret < 0) { |
6beb2242 | 4280 | if (errno != EEXIST) { |
f11e84c2 | 4281 | PERROR("mkdir"); |
3bd1e081 | 4282 | ERR("Failed to create %s", path); |
6beb2242 DG |
4283 | goto error; |
4284 | } | |
f11e84c2 | 4285 | ret = -1; |
d6f42150 DG |
4286 | } |
4287 | ||
4288 | /* Create the kconsumerd error unix socket */ | |
3bd1e081 MD |
4289 | consumer_data->err_sock = |
4290 | lttcomm_create_unix_sock(consumer_data->err_unix_sock_path); | |
4291 | if (consumer_data->err_sock < 0) { | |
4292 | ERR("Create unix sock failed: %s", consumer_data->err_unix_sock_path); | |
d6f42150 DG |
4293 | ret = -1; |
4294 | goto error; | |
4295 | } | |
4296 | ||
4297 | /* File permission MUST be 660 */ | |
3bd1e081 | 4298 | ret = chmod(consumer_data->err_unix_sock_path, |
54d01ffb | 4299 | S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP); |
d6f42150 | 4300 | if (ret < 0) { |
3bd1e081 | 4301 | ERR("Set file permissions failed: %s", consumer_data->err_unix_sock_path); |
67e40797 | 4302 | PERROR("chmod"); |
d6f42150 DG |
4303 | goto error; |
4304 | } | |
4305 | ||
4306 | error: | |
4307 | return ret; | |
4308 | } | |
4309 | ||
fac6795d | 4310 | /* |
d063d709 | 4311 | * Signal handler for the daemon |
cf3af59e | 4312 | * |
54d01ffb DG |
4313 | * Simply stop all worker threads, leaving main() return gracefully after |
4314 | * joining all threads and calling cleanup(). | |
fac6795d DG |
4315 | */ |
4316 | static void sighandler(int sig) | |
4317 | { | |
4318 | switch (sig) { | |
cf3af59e | 4319 | case SIGPIPE: |
af87c45a | 4320 | DBG("SIGPIPE caught"); |
cf3af59e MD |
4321 | return; |
4322 | case SIGINT: | |
af87c45a | 4323 | DBG("SIGINT caught"); |
cf3af59e MD |
4324 | stop_threads(); |
4325 | break; | |
4326 | case SIGTERM: | |
af87c45a | 4327 | DBG("SIGTERM caught"); |
cf3af59e MD |
4328 | stop_threads(); |
4329 | break; | |
4330 | default: | |
4331 | break; | |
fac6795d | 4332 | } |
fac6795d DG |
4333 | } |
4334 | ||
4335 | /* | |
d063d709 | 4336 | * Setup signal handler for : |
1d4b027a | 4337 | * SIGINT, SIGTERM, SIGPIPE |
fac6795d | 4338 | */ |
1d4b027a | 4339 | static int set_signal_handler(void) |
fac6795d | 4340 | { |
1d4b027a DG |
4341 | int ret = 0; |
4342 | struct sigaction sa; | |
4343 | sigset_t sigset; | |
fac6795d | 4344 | |
1d4b027a | 4345 | if ((ret = sigemptyset(&sigset)) < 0) { |
76d7553f | 4346 | PERROR("sigemptyset"); |
1d4b027a DG |
4347 | return ret; |
4348 | } | |
d6f42150 | 4349 | |
1d4b027a DG |
4350 | sa.sa_handler = sighandler; |
4351 | sa.sa_mask = sigset; | |
4352 | sa.sa_flags = 0; | |
4353 | if ((ret = sigaction(SIGTERM, &sa, NULL)) < 0) { | |
76d7553f | 4354 | PERROR("sigaction"); |
1d4b027a | 4355 | return ret; |
d6f42150 DG |
4356 | } |
4357 | ||
1d4b027a | 4358 | if ((ret = sigaction(SIGINT, &sa, NULL)) < 0) { |
76d7553f | 4359 | PERROR("sigaction"); |
1d4b027a | 4360 | return ret; |
d6f42150 | 4361 | } |
aaf26714 | 4362 | |
1d4b027a | 4363 | if ((ret = sigaction(SIGPIPE, &sa, NULL)) < 0) { |
76d7553f | 4364 | PERROR("sigaction"); |
1d4b027a | 4365 | return ret; |
8c0faa1d DG |
4366 | } |
4367 | ||
1d4b027a DG |
4368 | DBG("Signal handler set for SIGTERM, SIGPIPE and SIGINT"); |
4369 | ||
4370 | return ret; | |
fac6795d DG |
4371 | } |
4372 | ||
f3ed775e | 4373 | /* |
d063d709 DG |
4374 | * Set open files limit to unlimited. This daemon can open a large number of |
4375 | * file descriptors in order to consumer multiple kernel traces. | |
f3ed775e DG |
4376 | */ |
4377 | static void set_ulimit(void) | |
4378 | { | |
4379 | int ret; | |
4380 | struct rlimit lim; | |
4381 | ||
a88df331 | 4382 | /* The kernel does not allowed an infinite limit for open files */ |
f3ed775e DG |
4383 | lim.rlim_cur = 65535; |
4384 | lim.rlim_max = 65535; | |
4385 | ||
4386 | ret = setrlimit(RLIMIT_NOFILE, &lim); | |
4387 | if (ret < 0) { | |
76d7553f | 4388 | PERROR("failed to set open files limit"); |
f3ed775e DG |
4389 | } |
4390 | } | |
4391 | ||
fac6795d DG |
4392 | /* |
4393 | * main | |
4394 | */ | |
4395 | int main(int argc, char **argv) | |
4396 | { | |
fac6795d DG |
4397 | int ret = 0; |
4398 | void *status; | |
b082db07 | 4399 | const char *home_path; |
fac6795d | 4400 | |
335a95b7 MD |
4401 | init_kernel_workarounds(); |
4402 | ||
f6a9efaa DG |
4403 | rcu_register_thread(); |
4404 | ||
273ea72c | 4405 | /* Create thread quit pipe */ |
cf3af59e MD |
4406 | if ((ret = init_thread_quit_pipe()) < 0) { |
4407 | goto error; | |
273ea72c DG |
4408 | } |
4409 | ||
7753dea8 | 4410 | setup_consumerd_path(); |
fb09408a | 4411 | |
fac6795d DG |
4412 | /* Parse arguments */ |
4413 | progname = argv[0]; | |
4414 | if ((ret = parse_args(argc, argv) < 0)) { | |
cf3af59e | 4415 | goto error; |
fac6795d DG |
4416 | } |
4417 | ||
4418 | /* Daemonize */ | |
4419 | if (opt_daemon) { | |
53094c05 DG |
4420 | ret = daemon(0, 0); |
4421 | if (ret < 0) { | |
76d7553f | 4422 | PERROR("daemon"); |
cf3af59e | 4423 | goto error; |
53094c05 | 4424 | } |
fac6795d DG |
4425 | } |
4426 | ||
4427 | /* Check if daemon is UID = 0 */ | |
4428 | is_root = !getuid(); | |
4429 | ||
fac6795d | 4430 | if (is_root) { |
990570ed | 4431 | rundir = strdup(DEFAULT_LTTNG_RUNDIR); |
67e40797 DG |
4432 | |
4433 | /* Create global run dir with root access */ | |
4434 | ret = create_lttng_rundir(rundir); | |
d6f42150 | 4435 | if (ret < 0) { |
cf3af59e | 4436 | goto error; |
d6f42150 DG |
4437 | } |
4438 | ||
fac6795d | 4439 | if (strlen(apps_unix_sock_path) == 0) { |
d6f42150 DG |
4440 | snprintf(apps_unix_sock_path, PATH_MAX, |
4441 | DEFAULT_GLOBAL_APPS_UNIX_SOCK); | |
fac6795d DG |
4442 | } |
4443 | ||
4444 | if (strlen(client_unix_sock_path) == 0) { | |
d6f42150 DG |
4445 | snprintf(client_unix_sock_path, PATH_MAX, |
4446 | DEFAULT_GLOBAL_CLIENT_UNIX_SOCK); | |
4447 | } | |
0fdd1e2c DG |
4448 | |
4449 | /* Set global SHM for ust */ | |
4450 | if (strlen(wait_shm_path) == 0) { | |
4451 | snprintf(wait_shm_path, PATH_MAX, | |
4452 | DEFAULT_GLOBAL_APPS_WAIT_SHM_PATH); | |
4453 | } | |
67e40797 DG |
4454 | |
4455 | /* Setup kernel consumerd path */ | |
4456 | snprintf(kconsumer_data.err_unix_sock_path, PATH_MAX, | |
60922cb0 | 4457 | DEFAULT_KCONSUMERD_ERR_SOCK_PATH, rundir); |
67e40797 | 4458 | snprintf(kconsumer_data.cmd_unix_sock_path, PATH_MAX, |
60922cb0 | 4459 | DEFAULT_KCONSUMERD_CMD_SOCK_PATH, rundir); |
67e40797 DG |
4460 | |
4461 | DBG2("Kernel consumer err path: %s", | |
4462 | kconsumer_data.err_unix_sock_path); | |
4463 | DBG2("Kernel consumer cmd path: %s", | |
4464 | kconsumer_data.cmd_unix_sock_path); | |
fac6795d | 4465 | } else { |
b082db07 DG |
4466 | home_path = get_home_dir(); |
4467 | if (home_path == NULL) { | |
273ea72c DG |
4468 | /* TODO: Add --socket PATH option */ |
4469 | ERR("Can't get HOME directory for sockets creation."); | |
cf3af59e MD |
4470 | ret = -EPERM; |
4471 | goto error; | |
b082db07 DG |
4472 | } |
4473 | ||
67e40797 DG |
4474 | /* |
4475 | * Create rundir from home path. This will create something like | |
4476 | * $HOME/.lttng | |
4477 | */ | |
990570ed | 4478 | ret = asprintf(&rundir, DEFAULT_LTTNG_HOME_RUNDIR, home_path); |
67e40797 DG |
4479 | if (ret < 0) { |
4480 | ret = -ENOMEM; | |
4481 | goto error; | |
4482 | } | |
4483 | ||
4484 | ret = create_lttng_rundir(rundir); | |
4485 | if (ret < 0) { | |
4486 | goto error; | |
4487 | } | |
4488 | ||
fac6795d | 4489 | if (strlen(apps_unix_sock_path) == 0) { |
d6f42150 | 4490 | snprintf(apps_unix_sock_path, PATH_MAX, |
b082db07 | 4491 | DEFAULT_HOME_APPS_UNIX_SOCK, home_path); |
fac6795d DG |
4492 | } |
4493 | ||
4494 | /* Set the cli tool unix socket path */ | |
4495 | if (strlen(client_unix_sock_path) == 0) { | |
d6f42150 | 4496 | snprintf(client_unix_sock_path, PATH_MAX, |
b082db07 | 4497 | DEFAULT_HOME_CLIENT_UNIX_SOCK, home_path); |
fac6795d | 4498 | } |
0fdd1e2c DG |
4499 | |
4500 | /* Set global SHM for ust */ | |
4501 | if (strlen(wait_shm_path) == 0) { | |
4502 | snprintf(wait_shm_path, PATH_MAX, | |
4503 | DEFAULT_HOME_APPS_WAIT_SHM_PATH, geteuid()); | |
4504 | } | |
fac6795d DG |
4505 | } |
4506 | ||
847177cd DG |
4507 | DBG("Client socket path %s", client_unix_sock_path); |
4508 | DBG("Application socket path %s", apps_unix_sock_path); | |
67e40797 DG |
4509 | DBG("LTTng run directory path: %s", rundir); |
4510 | ||
4511 | /* 32 bits consumerd path setup */ | |
4512 | snprintf(ustconsumer32_data.err_unix_sock_path, PATH_MAX, | |
60922cb0 | 4513 | DEFAULT_USTCONSUMERD32_ERR_SOCK_PATH, rundir); |
67e40797 | 4514 | snprintf(ustconsumer32_data.cmd_unix_sock_path, PATH_MAX, |
60922cb0 | 4515 | DEFAULT_USTCONSUMERD32_CMD_SOCK_PATH, rundir); |
67e40797 DG |
4516 | |
4517 | DBG2("UST consumer 32 bits err path: %s", | |
4518 | ustconsumer32_data.err_unix_sock_path); | |
4519 | DBG2("UST consumer 32 bits cmd path: %s", | |
4520 | ustconsumer32_data.cmd_unix_sock_path); | |
4521 | ||
4522 | /* 64 bits consumerd path setup */ | |
4523 | snprintf(ustconsumer64_data.err_unix_sock_path, PATH_MAX, | |
60922cb0 | 4524 | DEFAULT_USTCONSUMERD64_ERR_SOCK_PATH, rundir); |
67e40797 | 4525 | snprintf(ustconsumer64_data.cmd_unix_sock_path, PATH_MAX, |
60922cb0 | 4526 | DEFAULT_USTCONSUMERD64_CMD_SOCK_PATH, rundir); |
67e40797 DG |
4527 | |
4528 | DBG2("UST consumer 64 bits err path: %s", | |
4529 | ustconsumer64_data.err_unix_sock_path); | |
4530 | DBG2("UST consumer 64 bits cmd path: %s", | |
4531 | ustconsumer64_data.cmd_unix_sock_path); | |
847177cd | 4532 | |
273ea72c | 4533 | /* |
7d8234d9 | 4534 | * See if daemon already exist. |
fac6795d | 4535 | */ |
7d8234d9 | 4536 | if ((ret = check_existing_daemon()) < 0) { |
75462a81 | 4537 | ERR("Already running daemon.\n"); |
273ea72c | 4538 | /* |
cf3af59e MD |
4539 | * We do not goto exit because we must not cleanup() |
4540 | * because a daemon is already running. | |
ab118b20 | 4541 | */ |
cf3af59e | 4542 | goto error; |
a88df331 DG |
4543 | } |
4544 | ||
1427f9b2 DG |
4545 | /* |
4546 | * Init UST app hash table. Alloc hash table before this point since | |
4547 | * cleanup() can get called after that point. | |
4548 | */ | |
4549 | ust_app_ht_alloc(); | |
4550 | ||
54d01ffb | 4551 | /* After this point, we can safely call cleanup() with "goto exit" */ |
a88df331 DG |
4552 | |
4553 | /* | |
4554 | * These actions must be executed as root. We do that *after* setting up | |
4555 | * the sockets path because we MUST make the check for another daemon using | |
4556 | * those paths *before* trying to set the kernel consumer sockets and init | |
4557 | * kernel tracer. | |
4558 | */ | |
4559 | if (is_root) { | |
67e40797 | 4560 | ret = set_consumer_sockets(&kconsumer_data, rundir); |
7753dea8 MD |
4561 | if (ret < 0) { |
4562 | goto exit; | |
4563 | } | |
4564 | ||
a88df331 | 4565 | /* Setup kernel tracer */ |
4fba7219 DG |
4566 | if (!opt_no_kernel) { |
4567 | init_kernel_tracer(); | |
4568 | } | |
a88df331 DG |
4569 | |
4570 | /* Set ulimit for open files */ | |
4571 | set_ulimit(); | |
fac6795d | 4572 | } |
4063050c MD |
4573 | /* init lttng_fd tracking must be done after set_ulimit. */ |
4574 | lttng_fd_init(); | |
fac6795d | 4575 | |
67e40797 DG |
4576 | ret = set_consumer_sockets(&ustconsumer64_data, rundir); |
4577 | if (ret < 0) { | |
4578 | goto exit; | |
4579 | } | |
4580 | ||
4581 | ret = set_consumer_sockets(&ustconsumer32_data, rundir); | |
4582 | if (ret < 0) { | |
4583 | goto exit; | |
4584 | } | |
4585 | ||
cf3af59e MD |
4586 | if ((ret = set_signal_handler()) < 0) { |
4587 | goto exit; | |
fac6795d DG |
4588 | } |
4589 | ||
d6f42150 | 4590 | /* Setup the needed unix socket */ |
cf3af59e MD |
4591 | if ((ret = init_daemon_socket()) < 0) { |
4592 | goto exit; | |
fac6795d DG |
4593 | } |
4594 | ||
4595 | /* Set credentials to socket */ | |
be040666 | 4596 | if (is_root && ((ret = set_permissions(rundir)) < 0)) { |
cf3af59e | 4597 | goto exit; |
fac6795d DG |
4598 | } |
4599 | ||
5b8719f5 DG |
4600 | /* Get parent pid if -S, --sig-parent is specified. */ |
4601 | if (opt_sig_parent) { | |
4602 | ppid = getppid(); | |
4603 | } | |
4604 | ||
7a485870 | 4605 | /* Setup the kernel pipe for waking up the kernel thread */ |
cf3af59e MD |
4606 | if ((ret = create_kernel_poll_pipe()) < 0) { |
4607 | goto exit; | |
7a485870 DG |
4608 | } |
4609 | ||
099e26bd DG |
4610 | /* Setup the thread apps communication pipe. */ |
4611 | if ((ret = create_apps_cmd_pipe()) < 0) { | |
4612 | goto exit; | |
4613 | } | |
4614 | ||
4615 | /* Init UST command queue. */ | |
4616 | cds_wfq_init(&ust_cmd_queue.queue); | |
4617 | ||
273ea72c | 4618 | /* |
54d01ffb DG |
4619 | * Get session list pointer. This pointer MUST NOT be free(). This list is |
4620 | * statically declared in session.c | |
273ea72c | 4621 | */ |
54d01ffb | 4622 | session_list_ptr = session_get_list(); |
b5541356 | 4623 | |
5eb91c98 DG |
4624 | /* Set up max poll set size */ |
4625 | lttng_poll_set_max_size(); | |
4626 | ||
cf3af59e | 4627 | /* Create thread to manage the client socket */ |
099e26bd DG |
4628 | ret = pthread_create(&client_thread, NULL, |
4629 | thread_manage_clients, (void *) NULL); | |
cf3af59e | 4630 | if (ret != 0) { |
76d7553f | 4631 | PERROR("pthread_create clients"); |
cf3af59e MD |
4632 | goto exit_client; |
4633 | } | |
fac6795d | 4634 | |
099e26bd DG |
4635 | /* Create thread to dispatch registration */ |
4636 | ret = pthread_create(&dispatch_thread, NULL, | |
4637 | thread_dispatch_ust_registration, (void *) NULL); | |
4638 | if (ret != 0) { | |
76d7553f | 4639 | PERROR("pthread_create dispatch"); |
099e26bd DG |
4640 | goto exit_dispatch; |
4641 | } | |
4642 | ||
4643 | /* Create thread to manage application registration. */ | |
4644 | ret = pthread_create(®_apps_thread, NULL, | |
4645 | thread_registration_apps, (void *) NULL); | |
4646 | if (ret != 0) { | |
76d7553f | 4647 | PERROR("pthread_create registration"); |
099e26bd DG |
4648 | goto exit_reg_apps; |
4649 | } | |
4650 | ||
cf3af59e | 4651 | /* Create thread to manage application socket */ |
54d01ffb DG |
4652 | ret = pthread_create(&apps_thread, NULL, |
4653 | thread_manage_apps, (void *) NULL); | |
cf3af59e | 4654 | if (ret != 0) { |
76d7553f | 4655 | PERROR("pthread_create apps"); |
cf3af59e MD |
4656 | goto exit_apps; |
4657 | } | |
fac6795d | 4658 | |
cf3af59e | 4659 | /* Create kernel thread to manage kernel event */ |
54d01ffb DG |
4660 | ret = pthread_create(&kernel_thread, NULL, |
4661 | thread_manage_kernel, (void *) NULL); | |
cf3af59e | 4662 | if (ret != 0) { |
76d7553f | 4663 | PERROR("pthread_create kernel"); |
cf3af59e MD |
4664 | goto exit_kernel; |
4665 | } | |
7a485870 | 4666 | |
cf3af59e MD |
4667 | ret = pthread_join(kernel_thread, &status); |
4668 | if (ret != 0) { | |
76d7553f | 4669 | PERROR("pthread_join"); |
cf3af59e | 4670 | goto error; /* join error, exit without cleanup */ |
fac6795d DG |
4671 | } |
4672 | ||
cf3af59e MD |
4673 | exit_kernel: |
4674 | ret = pthread_join(apps_thread, &status); | |
4675 | if (ret != 0) { | |
76d7553f | 4676 | PERROR("pthread_join"); |
cf3af59e MD |
4677 | goto error; /* join error, exit without cleanup */ |
4678 | } | |
fac6795d | 4679 | |
cf3af59e | 4680 | exit_apps: |
099e26bd DG |
4681 | ret = pthread_join(reg_apps_thread, &status); |
4682 | if (ret != 0) { | |
76d7553f | 4683 | PERROR("pthread_join"); |
099e26bd DG |
4684 | goto error; /* join error, exit without cleanup */ |
4685 | } | |
4686 | ||
4687 | exit_reg_apps: | |
4688 | ret = pthread_join(dispatch_thread, &status); | |
4689 | if (ret != 0) { | |
76d7553f | 4690 | PERROR("pthread_join"); |
099e26bd DG |
4691 | goto error; /* join error, exit without cleanup */ |
4692 | } | |
4693 | ||
4694 | exit_dispatch: | |
cf3af59e MD |
4695 | ret = pthread_join(client_thread, &status); |
4696 | if (ret != 0) { | |
76d7553f | 4697 | PERROR("pthread_join"); |
cf3af59e MD |
4698 | goto error; /* join error, exit without cleanup */ |
4699 | } | |
4700 | ||
3bd1e081 | 4701 | ret = join_consumer_thread(&kconsumer_data); |
cf3af59e | 4702 | if (ret != 0) { |
76d7553f | 4703 | PERROR("join_consumer"); |
cf3af59e MD |
4704 | goto error; /* join error, exit without cleanup */ |
4705 | } | |
a88df331 | 4706 | |
cf3af59e | 4707 | exit_client: |
a88df331 | 4708 | exit: |
cf3af59e MD |
4709 | /* |
4710 | * cleanup() is called when no other thread is running. | |
4711 | */ | |
f6a9efaa | 4712 | rcu_thread_online(); |
cf3af59e | 4713 | cleanup(); |
f6a9efaa DG |
4714 | rcu_thread_offline(); |
4715 | rcu_unregister_thread(); | |
67e40797 | 4716 | if (!ret) { |
cf3af59e | 4717 | exit(EXIT_SUCCESS); |
67e40797 | 4718 | } |
cf3af59e | 4719 | error: |
5e16da05 | 4720 | exit(EXIT_FAILURE); |
fac6795d | 4721 | } |