Commit | Line | Data |
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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 | 35 | #include <sys/wait.h> |
5c827ce0 | 36 | #include <urcu/uatomic.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> | |
50c8f484 | 45 | #include <common/futex.h> |
00e2e675 | 46 | #include <common/relayd/relayd.h> |
fac6795d | 47 | |
10a8a223 | 48 | #include "lttng-sessiond.h" |
54d01ffb | 49 | #include "channel.h" |
00e2e675 | 50 | #include "consumer.h" |
099e26bd | 51 | #include "context.h" |
54d01ffb | 52 | #include "event.h" |
4771f025 | 53 | #include "kernel.h" |
f1e16794 | 54 | #include "kernel-consumer.h" |
096102bd | 55 | #include "modprobe.h" |
0fdd1e2c | 56 | #include "shm.h" |
1e307fab | 57 | #include "ust-ctl.h" |
00e2e675 | 58 | #include "ust-consumer.h" |
8e68d1c8 | 59 | #include "utils.h" |
4063050c | 60 | #include "fd-limit.h" |
53a80697 | 61 | #include "filter.h" |
fac6795d | 62 | |
ebaeda94 MD |
63 | #define CONSUMERD_FILE "lttng-consumerd" |
64 | ||
75462a81 | 65 | /* Const values */ |
686204ab | 66 | const char default_home_dir[] = DEFAULT_HOME_DIR; |
bbccc3d2 | 67 | const char default_tracing_group[] = DEFAULT_TRACING_GROUP; |
686204ab MD |
68 | const char default_ust_sock_dir[] = DEFAULT_UST_SOCK_DIR; |
69 | const char default_global_apps_pipe[] = DEFAULT_GLOBAL_APPS_PIPE; | |
70 | ||
fac6795d DG |
71 | const char *progname; |
72 | const char *opt_tracing_group; | |
5b8719f5 | 73 | static int opt_sig_parent; |
97e19046 | 74 | static int opt_verbose_consumer; |
fac6795d | 75 | static int opt_daemon; |
4fba7219 | 76 | static int opt_no_kernel; |
fac6795d | 77 | static int is_root; /* Set to 1 if the daemon is running as root */ |
1d4b027a | 78 | static pid_t ppid; /* Parent PID for --sig-parent option */ |
67e40797 | 79 | static char *rundir; |
3bd1e081 MD |
80 | |
81 | /* Consumer daemon specific control data */ | |
82 | static struct consumer_data kconsumer_data = { | |
83 | .type = LTTNG_CONSUMER_KERNEL, | |
60922cb0 DG |
84 | .err_unix_sock_path = DEFAULT_KCONSUMERD_ERR_SOCK_PATH, |
85 | .cmd_unix_sock_path = DEFAULT_KCONSUMERD_CMD_SOCK_PATH, | |
03550b58 MD |
86 | .err_sock = -1, |
87 | .cmd_sock = -1, | |
3bd1e081 | 88 | }; |
7753dea8 MD |
89 | static struct consumer_data ustconsumer64_data = { |
90 | .type = LTTNG_CONSUMER64_UST, | |
60922cb0 DG |
91 | .err_unix_sock_path = DEFAULT_USTCONSUMERD64_ERR_SOCK_PATH, |
92 | .cmd_unix_sock_path = DEFAULT_USTCONSUMERD64_CMD_SOCK_PATH, | |
03550b58 MD |
93 | .err_sock = -1, |
94 | .cmd_sock = -1, | |
7753dea8 MD |
95 | }; |
96 | static struct consumer_data ustconsumer32_data = { | |
97 | .type = LTTNG_CONSUMER32_UST, | |
60922cb0 DG |
98 | .err_unix_sock_path = DEFAULT_USTCONSUMERD32_ERR_SOCK_PATH, |
99 | .cmd_unix_sock_path = DEFAULT_USTCONSUMERD32_CMD_SOCK_PATH, | |
03550b58 MD |
100 | .err_sock = -1, |
101 | .cmd_sock = -1, | |
3bd1e081 MD |
102 | }; |
103 | ||
099e26bd | 104 | static int dispatch_thread_exit; |
fac6795d | 105 | |
54d01ffb DG |
106 | /* Global application Unix socket path */ |
107 | static char apps_unix_sock_path[PATH_MAX]; | |
108 | /* Global client Unix socket path */ | |
109 | static char client_unix_sock_path[PATH_MAX]; | |
54d01ffb DG |
110 | /* global wait shm path for UST */ |
111 | static char wait_shm_path[PATH_MAX]; | |
fac6795d | 112 | |
1d4b027a | 113 | /* Sockets and FDs */ |
a4b35e07 MD |
114 | static int client_sock = -1; |
115 | static int apps_sock = -1; | |
116 | static int kernel_tracer_fd = -1; | |
76d7553f | 117 | static int kernel_poll_pipe[2] = { -1, -1 }; |
1d4b027a | 118 | |
273ea72c DG |
119 | /* |
120 | * Quit pipe for all threads. This permits a single cancellation point | |
121 | * for all threads when receiving an event on the pipe. | |
122 | */ | |
76d7553f | 123 | static int thread_quit_pipe[2] = { -1, -1 }; |
273ea72c | 124 | |
099e26bd DG |
125 | /* |
126 | * This pipe is used to inform the thread managing application communication | |
127 | * that a command is queued and ready to be processed. | |
128 | */ | |
76d7553f | 129 | static int apps_cmd_pipe[2] = { -1, -1 }; |
099e26bd | 130 | |
1d4b027a | 131 | /* Pthread, Mutexes and Semaphores */ |
1d4b027a | 132 | static pthread_t apps_thread; |
099e26bd | 133 | static pthread_t reg_apps_thread; |
1d4b027a | 134 | static pthread_t client_thread; |
7a485870 | 135 | static pthread_t kernel_thread; |
099e26bd | 136 | static pthread_t dispatch_thread; |
5eb91c98 | 137 | |
099e26bd DG |
138 | /* |
139 | * UST registration command queue. This queue is tied with a futex and uses a N | |
140 | * wakers / 1 waiter implemented and detailed in futex.c/.h | |
141 | * | |
142 | * The thread_manage_apps and thread_dispatch_ust_registration interact with | |
143 | * this queue and the wait/wake scheme. | |
144 | */ | |
145 | static struct ust_cmd_queue ust_cmd_queue; | |
146 | ||
b5541356 DG |
147 | /* |
148 | * Pointer initialized before thread creation. | |
149 | * | |
150 | * This points to the tracing session list containing the session count and a | |
151 | * mutex lock. The lock MUST be taken if you iterate over the list. The lock | |
152 | * MUST NOT be taken if you call a public function in session.c. | |
04ea676f | 153 | * |
d063d709 | 154 | * The lock is nested inside the structure: session_list_ptr->lock. Please use |
54d01ffb | 155 | * session_lock_list and session_unlock_list for lock acquisition. |
b5541356 DG |
156 | */ |
157 | static struct ltt_session_list *session_list_ptr; | |
158 | ||
7753dea8 MD |
159 | int ust_consumerd64_fd = -1; |
160 | int ust_consumerd32_fd = -1; | |
161 | ||
fb6f1fa2 YB |
162 | static const char *consumerd32_bin = CONFIG_CONSUMERD32_BIN; |
163 | static const char *consumerd64_bin = CONFIG_CONSUMERD64_BIN; | |
164 | static const char *consumerd32_libdir = CONFIG_CONSUMERD32_LIBDIR; | |
165 | static const char *consumerd64_libdir = CONFIG_CONSUMERD64_LIBDIR; | |
fb09408a | 166 | |
5c827ce0 DG |
167 | /* |
168 | * Consumer daemon state which is changed when spawning it, killing it or in | |
169 | * case of a fatal error. | |
170 | */ | |
171 | enum consumerd_state { | |
172 | CONSUMER_STARTED = 1, | |
173 | CONSUMER_STOPPED = 2, | |
174 | CONSUMER_ERROR = 3, | |
175 | }; | |
176 | ||
177 | /* | |
178 | * This consumer daemon state is used to validate if a client command will be | |
179 | * able to reach the consumer. If not, the client is informed. For instance, | |
180 | * doing a "lttng start" when the consumer state is set to ERROR will return an | |
181 | * error to the client. | |
182 | * | |
183 | * The following example shows a possible race condition of this scheme: | |
184 | * | |
185 | * consumer thread error happens | |
186 | * client cmd arrives | |
187 | * client cmd checks state -> still OK | |
188 | * consumer thread exit, sets error | |
189 | * client cmd try to talk to consumer | |
190 | * ... | |
191 | * | |
192 | * However, since the consumer is a different daemon, we have no way of making | |
193 | * sure the command will reach it safely even with this state flag. This is why | |
194 | * we consider that up to the state validation during command processing, the | |
195 | * command is safe. After that, we can not guarantee the correctness of the | |
196 | * client request vis-a-vis the consumer. | |
197 | */ | |
198 | static enum consumerd_state ust_consumerd_state; | |
199 | static enum consumerd_state kernel_consumerd_state; | |
200 | ||
00e2e675 DG |
201 | /* |
202 | * Used to keep a unique index for each relayd socket created where this value | |
203 | * is associated with streams on the consumer so it can match the right relayd | |
204 | * to send to. | |
205 | * | |
206 | * This value should be incremented atomically for safety purposes and future | |
207 | * possible concurrent access. | |
208 | */ | |
209 | static unsigned int relayd_net_seq_idx; | |
210 | ||
fb09408a | 211 | static |
7753dea8 | 212 | void setup_consumerd_path(void) |
fb09408a | 213 | { |
fc7a59ce | 214 | const char *bin, *libdir; |
fb09408a | 215 | |
7753dea8 MD |
216 | /* |
217 | * Allow INSTALL_BIN_PATH to be used as a target path for the | |
ebaeda94 MD |
218 | * native architecture size consumer if CONFIG_CONSUMER*_PATH |
219 | * has not been defined. | |
7753dea8 | 220 | */ |
ebaeda94 | 221 | #if (CAA_BITS_PER_LONG == 32) |
fc7a59ce AM |
222 | if (!consumerd32_bin[0]) { |
223 | consumerd32_bin = INSTALL_BIN_PATH "/" CONSUMERD_FILE; | |
ebaeda94 MD |
224 | } |
225 | if (!consumerd32_libdir[0]) { | |
226 | consumerd32_libdir = INSTALL_LIB_PATH; | |
227 | } | |
228 | #elif (CAA_BITS_PER_LONG == 64) | |
fc7a59ce AM |
229 | if (!consumerd64_bin[0]) { |
230 | consumerd64_bin = INSTALL_BIN_PATH "/" CONSUMERD_FILE; | |
7753dea8 | 231 | } |
ebaeda94 MD |
232 | if (!consumerd64_libdir[0]) { |
233 | consumerd64_libdir = INSTALL_LIB_PATH; | |
7753dea8 MD |
234 | } |
235 | #else | |
236 | #error "Unknown bitness" | |
237 | #endif | |
238 | ||
fb09408a MD |
239 | /* |
240 | * runtime env. var. overrides the build default. | |
241 | */ | |
fc7a59ce AM |
242 | bin = getenv("LTTNG_CONSUMERD32_BIN"); |
243 | if (bin) { | |
244 | consumerd32_bin = bin; | |
7753dea8 | 245 | } |
fc7a59ce AM |
246 | bin = getenv("LTTNG_CONSUMERD64_BIN"); |
247 | if (bin) { | |
248 | consumerd64_bin = bin; | |
ebaeda94 | 249 | } |
72f579ee | 250 | libdir = getenv("LTTNG_CONSUMERD32_LIBDIR"); |
ebaeda94 MD |
251 | if (libdir) { |
252 | consumerd32_libdir = libdir; | |
253 | } | |
72f579ee | 254 | libdir = getenv("LTTNG_CONSUMERD64_LIBDIR"); |
ebaeda94 MD |
255 | if (libdir) { |
256 | consumerd64_libdir = libdir; | |
fb09408a MD |
257 | } |
258 | } | |
259 | ||
5eb91c98 DG |
260 | /* |
261 | * Create a poll set with O_CLOEXEC and add the thread quit pipe to the set. | |
262 | */ | |
263 | static int create_thread_poll_set(struct lttng_poll_event *events, | |
264 | unsigned int size) | |
265 | { | |
266 | int ret; | |
267 | ||
268 | if (events == NULL || size == 0) { | |
269 | ret = -1; | |
270 | goto error; | |
271 | } | |
272 | ||
273 | ret = lttng_poll_create(events, size, LTTNG_CLOEXEC); | |
274 | if (ret < 0) { | |
275 | goto error; | |
276 | } | |
277 | ||
278 | /* Add quit pipe */ | |
279 | ret = lttng_poll_add(events, thread_quit_pipe[0], LPOLLIN); | |
280 | if (ret < 0) { | |
281 | goto error; | |
282 | } | |
283 | ||
284 | return 0; | |
285 | ||
286 | error: | |
287 | return ret; | |
288 | } | |
289 | ||
290 | /* | |
291 | * Check if the thread quit pipe was triggered. | |
292 | * | |
293 | * Return 1 if it was triggered else 0; | |
294 | */ | |
295 | static int check_thread_quit_pipe(int fd, uint32_t events) | |
296 | { | |
297 | if (fd == thread_quit_pipe[0] && (events & LPOLLIN)) { | |
298 | return 1; | |
299 | } | |
300 | ||
301 | return 0; | |
302 | } | |
303 | ||
0fdd1e2c DG |
304 | /* |
305 | * Return group ID of the tracing group or -1 if not found. | |
306 | */ | |
996b65c8 MD |
307 | static gid_t allowed_group(void) |
308 | { | |
309 | struct group *grp; | |
310 | ||
274e143b MD |
311 | if (opt_tracing_group) { |
312 | grp = getgrnam(opt_tracing_group); | |
313 | } else { | |
314 | grp = getgrnam(default_tracing_group); | |
315 | } | |
996b65c8 MD |
316 | if (!grp) { |
317 | return -1; | |
318 | } else { | |
319 | return grp->gr_gid; | |
320 | } | |
321 | } | |
322 | ||
273ea72c | 323 | /* |
5eb91c98 | 324 | * Init thread quit pipe. |
273ea72c DG |
325 | * |
326 | * Return -1 on error or 0 if all pipes are created. | |
327 | */ | |
328 | static int init_thread_quit_pipe(void) | |
329 | { | |
730389d9 | 330 | int ret, i; |
273ea72c | 331 | |
730389d9 | 332 | ret = pipe(thread_quit_pipe); |
273ea72c | 333 | if (ret < 0) { |
730389d9 | 334 | PERROR("thread quit pipe"); |
273ea72c DG |
335 | goto error; |
336 | } | |
337 | ||
730389d9 DG |
338 | for (i = 0; i < 2; i++) { |
339 | ret = fcntl(thread_quit_pipe[i], F_SETFD, FD_CLOEXEC); | |
340 | if (ret < 0) { | |
341 | PERROR("fcntl"); | |
342 | goto error; | |
343 | } | |
344 | } | |
345 | ||
273ea72c DG |
346 | error: |
347 | return ret; | |
348 | } | |
349 | ||
fac6795d | 350 | /* |
d063d709 DG |
351 | * Complete teardown of a kernel session. This free all data structure related |
352 | * to a kernel session and update counter. | |
fac6795d | 353 | */ |
1d4b027a | 354 | static void teardown_kernel_session(struct ltt_session *session) |
fac6795d | 355 | { |
8f7a84dd | 356 | if (!session->kernel_session) { |
99bab54f | 357 | DBG3("No kernel session when tearing down session"); |
84ea9c99 | 358 | return; |
8f7a84dd DG |
359 | } |
360 | ||
84ea9c99 | 361 | DBG("Tearing down kernel session"); |
d9800920 | 362 | |
84ea9c99 MD |
363 | /* |
364 | * If a custom kernel consumer was registered, close the socket before | |
365 | * tearing down the complete kernel session structure | |
366 | */ | |
03550b58 MD |
367 | if (kconsumer_data.cmd_sock >= 0 && |
368 | session->kernel_session->consumer_fd != kconsumer_data.cmd_sock) { | |
84ea9c99 | 369 | lttcomm_close_unix_sock(session->kernel_session->consumer_fd); |
fac6795d | 370 | } |
84ea9c99 MD |
371 | |
372 | trace_kernel_destroy_session(session->kernel_session); | |
fac6795d DG |
373 | } |
374 | ||
f6a9efaa DG |
375 | /* |
376 | * Complete teardown of all UST sessions. This will free everything on his path | |
377 | * and destroy the core essence of all ust sessions :) | |
378 | */ | |
379 | static void teardown_ust_session(struct ltt_session *session) | |
380 | { | |
84cd17c6 MD |
381 | int ret; |
382 | ||
8f7a84dd | 383 | if (!session->ust_session) { |
99bab54f | 384 | DBG3("No UST session when tearing down session"); |
f470a390 | 385 | return; |
8f7a84dd DG |
386 | } |
387 | ||
84ea9c99 | 388 | DBG("Tearing down UST session(s)"); |
8f7a84dd | 389 | |
84cd17c6 MD |
390 | ret = ust_app_destroy_trace_all(session->ust_session); |
391 | if (ret) { | |
392 | ERR("Error in ust_app_destroy_trace_all"); | |
393 | } | |
8f7a84dd | 394 | |
f6a9efaa DG |
395 | trace_ust_destroy_session(session->ust_session); |
396 | } | |
397 | ||
099e26bd DG |
398 | /* |
399 | * Stop all threads by closing the thread quit pipe. | |
400 | */ | |
cf3af59e MD |
401 | static void stop_threads(void) |
402 | { | |
5eb91c98 DG |
403 | int ret; |
404 | ||
cf3af59e MD |
405 | /* Stopping all threads */ |
406 | DBG("Terminating all threads"); | |
54d01ffb | 407 | ret = notify_thread_pipe(thread_quit_pipe[1]); |
5eb91c98 DG |
408 | if (ret < 0) { |
409 | ERR("write error on thread quit pipe"); | |
410 | } | |
411 | ||
099e26bd DG |
412 | /* Dispatch thread */ |
413 | dispatch_thread_exit = 1; | |
414 | futex_nto1_wake(&ust_cmd_queue.futex); | |
cf3af59e MD |
415 | } |
416 | ||
fac6795d | 417 | /* |
d063d709 | 418 | * Cleanup the daemon |
fac6795d | 419 | */ |
cf3af59e | 420 | static void cleanup(void) |
fac6795d | 421 | { |
ef599319 | 422 | int ret; |
1d4b027a | 423 | char *cmd; |
af9737e9 | 424 | struct ltt_session *sess, *stmp; |
fac6795d | 425 | |
1d4b027a | 426 | DBG("Cleaning up"); |
e07ae692 | 427 | |
67e40797 DG |
428 | DBG("Removing %s directory", rundir); |
429 | ret = asprintf(&cmd, "rm -rf %s", rundir); | |
430 | if (ret < 0) { | |
431 | ERR("asprintf failed. Something is really wrong!"); | |
432 | } | |
5461b305 | 433 | |
67e40797 DG |
434 | /* Remove lttng run directory */ |
435 | ret = system(cmd); | |
436 | if (ret < 0) { | |
437 | ERR("Unable to clean %s", rundir); | |
1d4b027a | 438 | } |
67e40797 | 439 | free(cmd); |
5461b305 | 440 | |
99bab54f | 441 | DBG("Cleaning up all sessions"); |
fac6795d | 442 | |
b5541356 | 443 | /* Destroy session list mutex */ |
273ea72c DG |
444 | if (session_list_ptr != NULL) { |
445 | pthread_mutex_destroy(&session_list_ptr->lock); | |
446 | ||
447 | /* Cleanup ALL session */ | |
54d01ffb DG |
448 | cds_list_for_each_entry_safe(sess, stmp, |
449 | &session_list_ptr->head, list) { | |
273ea72c | 450 | teardown_kernel_session(sess); |
f6a9efaa DG |
451 | teardown_ust_session(sess); |
452 | free(sess); | |
273ea72c DG |
453 | } |
454 | } | |
455 | ||
099e26bd | 456 | DBG("Closing all UST sockets"); |
56fff090 | 457 | ust_app_clean_list(); |
099e26bd | 458 | |
3bd1e081 | 459 | pthread_mutex_destroy(&kconsumer_data.pid_mutex); |
b5541356 | 460 | |
4fba7219 DG |
461 | if (is_root && !opt_no_kernel) { |
462 | DBG2("Closing kernel fd"); | |
a4b35e07 | 463 | if (kernel_tracer_fd >= 0) { |
76d7553f MD |
464 | ret = close(kernel_tracer_fd); |
465 | if (ret) { | |
466 | PERROR("close"); | |
467 | } | |
a4b35e07 | 468 | } |
2f50c8a3 | 469 | DBG("Unloading kernel modules"); |
096102bd | 470 | modprobe_remove_lttng_all(); |
2f50c8a3 | 471 | } |
ef599319 DG |
472 | utils_close_pipe(kernel_poll_pipe); |
473 | utils_close_pipe(thread_quit_pipe); | |
474 | utils_close_pipe(apps_cmd_pipe); | |
421cb601 DG |
475 | |
476 | /* <fun> */ | |
f56a39af | 477 | DBG("%c[%d;%dm*** assert failed :-) *** ==> %c[%dm%c[%d;%dm" |
421cb601 DG |
478 | "Matthew, BEET driven development works!%c[%dm", |
479 | 27, 1, 31, 27, 0, 27, 1, 33, 27, 0); | |
480 | /* </fun> */ | |
fac6795d DG |
481 | } |
482 | ||
e065084a | 483 | /* |
d063d709 | 484 | * Send data on a unix socket using the liblttsessiondcomm API. |
e065084a | 485 | * |
d063d709 | 486 | * Return lttcomm error code. |
e065084a DG |
487 | */ |
488 | static int send_unix_sock(int sock, void *buf, size_t len) | |
489 | { | |
490 | /* Check valid length */ | |
491 | if (len <= 0) { | |
492 | return -1; | |
493 | } | |
494 | ||
495 | return lttcomm_send_unix_sock(sock, buf, len); | |
496 | } | |
497 | ||
5461b305 | 498 | /* |
d063d709 | 499 | * Free memory of a command context structure. |
5461b305 | 500 | */ |
a2fb29a5 | 501 | static void clean_command_ctx(struct command_ctx **cmd_ctx) |
5461b305 | 502 | { |
a2fb29a5 DG |
503 | DBG("Clean command context structure"); |
504 | if (*cmd_ctx) { | |
505 | if ((*cmd_ctx)->llm) { | |
506 | free((*cmd_ctx)->llm); | |
5461b305 | 507 | } |
a2fb29a5 DG |
508 | if ((*cmd_ctx)->lsm) { |
509 | free((*cmd_ctx)->lsm); | |
5461b305 | 510 | } |
a2fb29a5 DG |
511 | free(*cmd_ctx); |
512 | *cmd_ctx = NULL; | |
5461b305 DG |
513 | } |
514 | } | |
515 | ||
fac6795d | 516 | /* |
0fdd1e2c | 517 | * Notify UST applications using the shm mmap futex. |
fac6795d | 518 | */ |
0fdd1e2c | 519 | static int notify_ust_apps(int active) |
fac6795d | 520 | { |
0fdd1e2c | 521 | char *wait_shm_mmap; |
fac6795d | 522 | |
0fdd1e2c | 523 | DBG("Notifying applications of session daemon state: %d", active); |
e07ae692 | 524 | |
0fdd1e2c DG |
525 | /* See shm.c for this call implying mmap, shm and futex calls */ |
526 | wait_shm_mmap = shm_ust_get_mmap(wait_shm_path, is_root); | |
527 | if (wait_shm_mmap == NULL) { | |
fac6795d DG |
528 | goto error; |
529 | } | |
530 | ||
0fdd1e2c DG |
531 | /* Wake waiting process */ |
532 | futex_wait_update((int32_t *) wait_shm_mmap, active); | |
533 | ||
534 | /* Apps notified successfully */ | |
535 | return 0; | |
fac6795d DG |
536 | |
537 | error: | |
0fdd1e2c | 538 | return -1; |
fac6795d DG |
539 | } |
540 | ||
e065084a | 541 | /* |
d063d709 DG |
542 | * Setup the outgoing data buffer for the response (llm) by allocating the |
543 | * right amount of memory and copying the original information from the lsm | |
544 | * structure. | |
ca95a216 | 545 | * |
d063d709 | 546 | * Return total size of the buffer pointed by buf. |
ca95a216 | 547 | */ |
5461b305 | 548 | static int setup_lttng_msg(struct command_ctx *cmd_ctx, size_t size) |
ca95a216 | 549 | { |
f3ed775e | 550 | int ret, buf_size; |
ca95a216 | 551 | |
f3ed775e | 552 | buf_size = size; |
5461b305 | 553 | |
ba7f0ae5 | 554 | cmd_ctx->llm = zmalloc(sizeof(struct lttcomm_lttng_msg) + buf_size); |
5461b305 | 555 | if (cmd_ctx->llm == NULL) { |
76d7553f | 556 | PERROR("zmalloc"); |
5461b305 | 557 | ret = -ENOMEM; |
ca95a216 DG |
558 | goto error; |
559 | } | |
560 | ||
5461b305 DG |
561 | /* Copy common data */ |
562 | cmd_ctx->llm->cmd_type = cmd_ctx->lsm->cmd_type; | |
9f19cc17 | 563 | cmd_ctx->llm->pid = cmd_ctx->lsm->domain.attr.pid; |
5461b305 | 564 | |
5461b305 DG |
565 | cmd_ctx->llm->data_size = size; |
566 | cmd_ctx->lttng_msg_size = sizeof(struct lttcomm_lttng_msg) + buf_size; | |
567 | ||
ca95a216 DG |
568 | return buf_size; |
569 | ||
570 | error: | |
571 | return ret; | |
572 | } | |
573 | ||
7a485870 | 574 | /* |
5eb91c98 | 575 | * Update the kernel poll set of all channel fd available over all tracing |
d063d709 | 576 | * session. Add the wakeup pipe at the end of the set. |
7a485870 | 577 | */ |
5eb91c98 | 578 | static int update_kernel_poll(struct lttng_poll_event *events) |
7a485870 | 579 | { |
5eb91c98 | 580 | int ret; |
7a485870 DG |
581 | struct ltt_session *session; |
582 | struct ltt_kernel_channel *channel; | |
583 | ||
5eb91c98 | 584 | DBG("Updating kernel poll set"); |
7a485870 | 585 | |
54d01ffb | 586 | session_lock_list(); |
b5541356 | 587 | cds_list_for_each_entry(session, &session_list_ptr->head, list) { |
54d01ffb | 588 | session_lock(session); |
7a485870 | 589 | if (session->kernel_session == NULL) { |
54d01ffb | 590 | session_unlock(session); |
7a485870 DG |
591 | continue; |
592 | } | |
7a485870 | 593 | |
54d01ffb DG |
594 | cds_list_for_each_entry(channel, |
595 | &session->kernel_session->channel_list.head, list) { | |
5eb91c98 DG |
596 | /* Add channel fd to the kernel poll set */ |
597 | ret = lttng_poll_add(events, channel->fd, LPOLLIN | LPOLLRDNORM); | |
598 | if (ret < 0) { | |
54d01ffb | 599 | session_unlock(session); |
5eb91c98 DG |
600 | goto error; |
601 | } | |
602 | DBG("Channel fd %d added to kernel set", channel->fd); | |
7a485870 | 603 | } |
54d01ffb | 604 | session_unlock(session); |
7a485870 | 605 | } |
54d01ffb | 606 | session_unlock_list(); |
7a485870 | 607 | |
5eb91c98 | 608 | return 0; |
7a485870 DG |
609 | |
610 | error: | |
54d01ffb | 611 | session_unlock_list(); |
7a485870 DG |
612 | return -1; |
613 | } | |
614 | ||
615 | /* | |
54d01ffb | 616 | * Find the channel fd from 'fd' over all tracing session. When found, check |
d063d709 | 617 | * for new channel stream and send those stream fds to the kernel consumer. |
7a485870 | 618 | * |
d063d709 | 619 | * Useful for CPU hotplug feature. |
7a485870 | 620 | */ |
2bdd86d4 | 621 | static int update_kernel_stream(struct consumer_data *consumer_data, int fd) |
7a485870 DG |
622 | { |
623 | int ret = 0; | |
624 | struct ltt_session *session; | |
625 | struct ltt_kernel_channel *channel; | |
626 | ||
627 | DBG("Updating kernel streams for channel fd %d", fd); | |
628 | ||
54d01ffb | 629 | session_lock_list(); |
b5541356 | 630 | cds_list_for_each_entry(session, &session_list_ptr->head, list) { |
54d01ffb | 631 | session_lock(session); |
7a485870 | 632 | if (session->kernel_session == NULL) { |
54d01ffb | 633 | session_unlock(session); |
7a485870 DG |
634 | continue; |
635 | } | |
d9800920 | 636 | |
03550b58 MD |
637 | /* This is not suppose to be -1 but this is an extra security check */ |
638 | if (session->kernel_session->consumer_fd < 0) { | |
3bd1e081 | 639 | session->kernel_session->consumer_fd = consumer_data->cmd_sock; |
d9800920 DG |
640 | } |
641 | ||
5eb91c98 DG |
642 | cds_list_for_each_entry(channel, |
643 | &session->kernel_session->channel_list.head, list) { | |
7a485870 DG |
644 | if (channel->fd == fd) { |
645 | DBG("Channel found, updating kernel streams"); | |
646 | ret = kernel_open_channel_stream(channel); | |
647 | if (ret < 0) { | |
b3c750d2 | 648 | goto error; |
7a485870 | 649 | } |
d9800920 | 650 | |
7a485870 | 651 | /* |
5eb91c98 DG |
652 | * Have we already sent fds to the consumer? If yes, it means |
653 | * that tracing is started so it is safe to send our updated | |
654 | * stream fds. | |
7a485870 | 655 | */ |
00e2e675 DG |
656 | if (session->kernel_session->consumer_fds_sent == 1 && |
657 | session->kernel_session->consumer != NULL) { | |
658 | ret = kernel_consumer_send_channel_stream( | |
659 | session->kernel_session->consumer_fd, channel, | |
660 | session->kernel_session); | |
7a485870 | 661 | if (ret < 0) { |
b3c750d2 | 662 | goto error; |
7a485870 DG |
663 | } |
664 | } | |
b3c750d2 | 665 | goto error; |
7a485870 DG |
666 | } |
667 | } | |
54d01ffb | 668 | session_unlock(session); |
7a485870 | 669 | } |
54d01ffb | 670 | session_unlock_list(); |
b3c750d2 | 671 | return ret; |
7a485870 | 672 | |
b3c750d2 | 673 | error: |
54d01ffb DG |
674 | session_unlock(session); |
675 | session_unlock_list(); | |
7a485870 DG |
676 | return ret; |
677 | } | |
678 | ||
487cf67c DG |
679 | /* |
680 | * For each tracing session, update newly registered apps. | |
681 | */ | |
682 | static void update_ust_app(int app_sock) | |
683 | { | |
684 | struct ltt_session *sess, *stmp; | |
685 | ||
4ee14516 DG |
686 | session_lock_list(); |
687 | ||
487cf67c DG |
688 | /* For all tracing session(s) */ |
689 | cds_list_for_each_entry_safe(sess, stmp, &session_list_ptr->head, list) { | |
4ee14516 | 690 | session_lock(sess); |
421cb601 DG |
691 | if (sess->ust_session) { |
692 | ust_app_global_update(sess->ust_session, app_sock); | |
693 | } | |
4ee14516 | 694 | session_unlock(sess); |
487cf67c | 695 | } |
4ee14516 DG |
696 | |
697 | session_unlock_list(); | |
487cf67c DG |
698 | } |
699 | ||
7a485870 | 700 | /* |
d063d709 | 701 | * This thread manage event coming from the kernel. |
7a485870 | 702 | * |
d063d709 DG |
703 | * Features supported in this thread: |
704 | * -) CPU Hotplug | |
7a485870 DG |
705 | */ |
706 | static void *thread_manage_kernel(void *data) | |
707 | { | |
5eb91c98 DG |
708 | int ret, i, pollfd, update_poll_flag = 1; |
709 | uint32_t revents, nb_fd; | |
7a485870 | 710 | char tmp; |
5eb91c98 | 711 | struct lttng_poll_event events; |
7a485870 DG |
712 | |
713 | DBG("Thread manage kernel started"); | |
714 | ||
5eb91c98 DG |
715 | ret = create_thread_poll_set(&events, 2); |
716 | if (ret < 0) { | |
76d7553f | 717 | goto error_poll_create; |
5eb91c98 DG |
718 | } |
719 | ||
720 | ret = lttng_poll_add(&events, kernel_poll_pipe[0], LPOLLIN); | |
721 | if (ret < 0) { | |
722 | goto error; | |
723 | } | |
724 | ||
7a485870 DG |
725 | while (1) { |
726 | if (update_poll_flag == 1) { | |
5f822d0a DG |
727 | /* |
728 | * Reset number of fd in the poll set. Always 2 since there is the thread | |
729 | * quit pipe and the kernel pipe. | |
730 | */ | |
731 | events.nb_fd = 2; | |
732 | ||
5eb91c98 DG |
733 | ret = update_kernel_poll(&events); |
734 | if (ret < 0) { | |
7a485870 DG |
735 | goto error; |
736 | } | |
737 | update_poll_flag = 0; | |
738 | } | |
739 | ||
5eb91c98 DG |
740 | nb_fd = LTTNG_POLL_GETNB(&events); |
741 | ||
742 | DBG("Thread kernel polling on %d fds", nb_fd); | |
743 | ||
744 | /* Zeroed the poll events */ | |
745 | lttng_poll_reset(&events); | |
7a485870 DG |
746 | |
747 | /* Poll infinite value of time */ | |
88f2b785 | 748 | restart: |
5eb91c98 | 749 | ret = lttng_poll_wait(&events, -1); |
7a485870 | 750 | if (ret < 0) { |
88f2b785 MD |
751 | /* |
752 | * Restart interrupted system call. | |
753 | */ | |
754 | if (errno == EINTR) { | |
755 | goto restart; | |
756 | } | |
7a485870 DG |
757 | goto error; |
758 | } else if (ret == 0) { | |
759 | /* Should not happen since timeout is infinite */ | |
85611738 DG |
760 | ERR("Return value of poll is 0 with an infinite timeout.\n" |
761 | "This should not have happened! Continuing..."); | |
7a485870 DG |
762 | continue; |
763 | } | |
764 | ||
5eb91c98 DG |
765 | for (i = 0; i < nb_fd; i++) { |
766 | /* Fetch once the poll data */ | |
767 | revents = LTTNG_POLL_GETEV(&events, i); | |
768 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
7a485870 | 769 | |
5eb91c98 DG |
770 | /* Thread quit pipe has been closed. Killing thread. */ |
771 | ret = check_thread_quit_pipe(pollfd, revents); | |
772 | if (ret) { | |
773 | goto error; | |
774 | } | |
7a485870 | 775 | |
5eb91c98 DG |
776 | /* Check for data on kernel pipe */ |
777 | if (pollfd == kernel_poll_pipe[0] && (revents & LPOLLIN)) { | |
778 | ret = read(kernel_poll_pipe[0], &tmp, 1); | |
779 | update_poll_flag = 1; | |
780 | continue; | |
781 | } else { | |
782 | /* | |
783 | * New CPU detected by the kernel. Adding kernel stream to | |
784 | * kernel session and updating the kernel consumer | |
785 | */ | |
786 | if (revents & LPOLLIN) { | |
2bdd86d4 | 787 | ret = update_kernel_stream(&kconsumer_data, pollfd); |
5eb91c98 DG |
788 | if (ret < 0) { |
789 | continue; | |
790 | } | |
791 | break; | |
792 | /* | |
793 | * TODO: We might want to handle the LPOLLERR | LPOLLHUP | |
794 | * and unregister kernel stream at this point. | |
795 | */ | |
7a485870 | 796 | } |
7a485870 DG |
797 | } |
798 | } | |
799 | } | |
800 | ||
801 | error: | |
5eb91c98 | 802 | lttng_poll_clean(&events); |
76d7553f MD |
803 | error_poll_create: |
804 | DBG("Kernel thread dying"); | |
7a485870 DG |
805 | return NULL; |
806 | } | |
807 | ||
1d4b027a | 808 | /* |
3bd1e081 | 809 | * This thread manage the consumer error sent back to the session daemon. |
1d4b027a | 810 | */ |
3bd1e081 | 811 | static void *thread_manage_consumer(void *data) |
1d4b027a | 812 | { |
76d7553f | 813 | int sock = -1, i, ret, pollfd; |
5eb91c98 | 814 | uint32_t revents, nb_fd; |
1d4b027a | 815 | enum lttcomm_return_code code; |
5eb91c98 | 816 | struct lttng_poll_event events; |
3bd1e081 | 817 | struct consumer_data *consumer_data = data; |
1d4b027a | 818 | |
3bd1e081 | 819 | DBG("[thread] Manage consumer started"); |
1d4b027a | 820 | |
3bd1e081 | 821 | ret = lttcomm_listen_unix_sock(consumer_data->err_sock); |
1d4b027a | 822 | if (ret < 0) { |
76d7553f | 823 | goto error_listen; |
1d4b027a DG |
824 | } |
825 | ||
5eb91c98 DG |
826 | /* |
827 | * Pass 2 as size here for the thread quit pipe and kconsumerd_err_sock. | |
828 | * Nothing more will be added to this poll set. | |
829 | */ | |
830 | ret = create_thread_poll_set(&events, 2); | |
831 | if (ret < 0) { | |
76d7553f | 832 | goto error_poll; |
5eb91c98 | 833 | } |
273ea72c | 834 | |
3bd1e081 | 835 | ret = lttng_poll_add(&events, consumer_data->err_sock, LPOLLIN | LPOLLRDHUP); |
5eb91c98 DG |
836 | if (ret < 0) { |
837 | goto error; | |
838 | } | |
839 | ||
840 | nb_fd = LTTNG_POLL_GETNB(&events); | |
273ea72c DG |
841 | |
842 | /* Inifinite blocking call, waiting for transmission */ | |
88f2b785 | 843 | restart: |
5eb91c98 | 844 | ret = lttng_poll_wait(&events, -1); |
273ea72c | 845 | if (ret < 0) { |
88f2b785 MD |
846 | /* |
847 | * Restart interrupted system call. | |
848 | */ | |
849 | if (errno == EINTR) { | |
850 | goto restart; | |
851 | } | |
273ea72c DG |
852 | goto error; |
853 | } | |
854 | ||
5eb91c98 DG |
855 | for (i = 0; i < nb_fd; i++) { |
856 | /* Fetch once the poll data */ | |
857 | revents = LTTNG_POLL_GETEV(&events, i); | |
858 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
859 | ||
860 | /* Thread quit pipe has been closed. Killing thread. */ | |
861 | ret = check_thread_quit_pipe(pollfd, revents); | |
862 | if (ret) { | |
863 | goto error; | |
864 | } | |
865 | ||
866 | /* Event on the registration socket */ | |
3bd1e081 | 867 | if (pollfd == consumer_data->err_sock) { |
5eb91c98 | 868 | if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { |
3bd1e081 | 869 | ERR("consumer err socket poll error"); |
5eb91c98 DG |
870 | goto error; |
871 | } | |
872 | } | |
273ea72c DG |
873 | } |
874 | ||
3bd1e081 | 875 | sock = lttcomm_accept_unix_sock(consumer_data->err_sock); |
1d4b027a DG |
876 | if (sock < 0) { |
877 | goto error; | |
878 | } | |
879 | ||
3bd1e081 | 880 | DBG2("Receiving code from consumer err_sock"); |
ee0b0061 | 881 | |
712ea556 | 882 | /* Getting status code from kconsumerd */ |
54d01ffb DG |
883 | ret = lttcomm_recv_unix_sock(sock, &code, |
884 | sizeof(enum lttcomm_return_code)); | |
1d4b027a DG |
885 | if (ret <= 0) { |
886 | goto error; | |
887 | } | |
888 | ||
3bd1e081 MD |
889 | if (code == CONSUMERD_COMMAND_SOCK_READY) { |
890 | consumer_data->cmd_sock = | |
891 | lttcomm_connect_unix_sock(consumer_data->cmd_unix_sock_path); | |
892 | if (consumer_data->cmd_sock < 0) { | |
893 | sem_post(&consumer_data->sem); | |
48842b30 | 894 | PERROR("consumer connect"); |
1d4b027a DG |
895 | goto error; |
896 | } | |
897 | /* Signal condition to tell that the kconsumerd is ready */ | |
3bd1e081 MD |
898 | sem_post(&consumer_data->sem); |
899 | DBG("consumer command socket ready"); | |
1d4b027a | 900 | } else { |
3bd1e081 | 901 | ERR("consumer error when waiting for SOCK_READY : %s", |
1d4b027a DG |
902 | lttcomm_get_readable_code(-code)); |
903 | goto error; | |
904 | } | |
905 | ||
54d01ffb | 906 | /* Remove the kconsumerd error sock since we've established a connexion */ |
3bd1e081 | 907 | ret = lttng_poll_del(&events, consumer_data->err_sock); |
72079cae | 908 | if (ret < 0) { |
72079cae DG |
909 | goto error; |
910 | } | |
911 | ||
5eb91c98 DG |
912 | ret = lttng_poll_add(&events, sock, LPOLLIN | LPOLLRDHUP); |
913 | if (ret < 0) { | |
72079cae | 914 | goto error; |
5eb91c98 DG |
915 | } |
916 | ||
917 | /* Update number of fd */ | |
918 | nb_fd = LTTNG_POLL_GETNB(&events); | |
919 | ||
920 | /* Inifinite blocking call, waiting for transmission */ | |
88f2b785 | 921 | restart_poll: |
5eb91c98 DG |
922 | ret = lttng_poll_wait(&events, -1); |
923 | if (ret < 0) { | |
88f2b785 MD |
924 | /* |
925 | * Restart interrupted system call. | |
926 | */ | |
927 | if (errno == EINTR) { | |
928 | goto restart_poll; | |
929 | } | |
72079cae DG |
930 | goto error; |
931 | } | |
932 | ||
5eb91c98 DG |
933 | for (i = 0; i < nb_fd; i++) { |
934 | /* Fetch once the poll data */ | |
935 | revents = LTTNG_POLL_GETEV(&events, i); | |
936 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
937 | ||
938 | /* Thread quit pipe has been closed. Killing thread. */ | |
939 | ret = check_thread_quit_pipe(pollfd, revents); | |
940 | if (ret) { | |
941 | goto error; | |
942 | } | |
943 | ||
944 | /* Event on the kconsumerd socket */ | |
945 | if (pollfd == sock) { | |
946 | if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { | |
3bd1e081 | 947 | ERR("consumer err socket second poll error"); |
5eb91c98 DG |
948 | goto error; |
949 | } | |
950 | } | |
951 | } | |
952 | ||
712ea556 | 953 | /* Wait for any kconsumerd error */ |
54d01ffb DG |
954 | ret = lttcomm_recv_unix_sock(sock, &code, |
955 | sizeof(enum lttcomm_return_code)); | |
712ea556 | 956 | if (ret <= 0) { |
3bd1e081 | 957 | ERR("consumer closed the command socket"); |
712ea556 | 958 | goto error; |
6f61d021 | 959 | } |
1d4b027a | 960 | |
3bd1e081 | 961 | ERR("consumer return code : %s", lttcomm_get_readable_code(-code)); |
712ea556 | 962 | |
1d4b027a | 963 | error: |
5c827ce0 DG |
964 | /* Immediately set the consumerd state to stopped */ |
965 | if (consumer_data->type == LTTNG_CONSUMER_KERNEL) { | |
966 | uatomic_set(&kernel_consumerd_state, CONSUMER_ERROR); | |
967 | } else if (consumer_data->type == LTTNG_CONSUMER64_UST || | |
968 | consumer_data->type == LTTNG_CONSUMER32_UST) { | |
969 | uatomic_set(&ust_consumerd_state, CONSUMER_ERROR); | |
970 | } else { | |
971 | /* Code flow error... */ | |
972 | assert(0); | |
973 | } | |
974 | ||
76d7553f MD |
975 | if (consumer_data->err_sock >= 0) { |
976 | ret = close(consumer_data->err_sock); | |
977 | if (ret) { | |
978 | PERROR("close"); | |
979 | } | |
980 | } | |
981 | if (consumer_data->cmd_sock >= 0) { | |
982 | ret = close(consumer_data->cmd_sock); | |
983 | if (ret) { | |
984 | PERROR("close"); | |
985 | } | |
986 | } | |
987 | if (sock >= 0) { | |
988 | ret = close(sock); | |
989 | if (ret) { | |
990 | PERROR("close"); | |
991 | } | |
992 | } | |
273ea72c | 993 | |
3bd1e081 MD |
994 | unlink(consumer_data->err_unix_sock_path); |
995 | unlink(consumer_data->cmd_unix_sock_path); | |
996 | consumer_data->pid = 0; | |
1d4b027a | 997 | |
5eb91c98 | 998 | lttng_poll_clean(&events); |
76d7553f MD |
999 | error_poll: |
1000 | error_listen: | |
1001 | DBG("consumer thread cleanup completed"); | |
0177d773 | 1002 | |
5eb91c98 | 1003 | return NULL; |
099e26bd DG |
1004 | } |
1005 | ||
099e26bd DG |
1006 | /* |
1007 | * This thread manage application communication. | |
1d4b027a DG |
1008 | */ |
1009 | static void *thread_manage_apps(void *data) | |
099e26bd | 1010 | { |
5eb91c98 DG |
1011 | int i, ret, pollfd; |
1012 | uint32_t revents, nb_fd; | |
099e26bd | 1013 | struct ust_command ust_cmd; |
5eb91c98 | 1014 | struct lttng_poll_event events; |
099e26bd DG |
1015 | |
1016 | DBG("[thread] Manage application started"); | |
1017 | ||
f6a9efaa DG |
1018 | rcu_register_thread(); |
1019 | rcu_thread_online(); | |
1020 | ||
5eb91c98 DG |
1021 | ret = create_thread_poll_set(&events, 2); |
1022 | if (ret < 0) { | |
76d7553f | 1023 | goto error_poll_create; |
5eb91c98 | 1024 | } |
099e26bd | 1025 | |
5eb91c98 DG |
1026 | ret = lttng_poll_add(&events, apps_cmd_pipe[0], LPOLLIN | LPOLLRDHUP); |
1027 | if (ret < 0) { | |
1028 | goto error; | |
1029 | } | |
099e26bd | 1030 | |
5eb91c98 DG |
1031 | while (1) { |
1032 | /* Zeroed the events structure */ | |
1033 | lttng_poll_reset(&events); | |
0177d773 | 1034 | |
5eb91c98 | 1035 | nb_fd = LTTNG_POLL_GETNB(&events); |
099e26bd DG |
1036 | |
1037 | DBG("Apps thread polling on %d fds", nb_fd); | |
1038 | ||
1039 | /* Inifinite blocking call, waiting for transmission */ | |
88f2b785 | 1040 | restart: |
5eb91c98 | 1041 | ret = lttng_poll_wait(&events, -1); |
099e26bd | 1042 | if (ret < 0) { |
88f2b785 MD |
1043 | /* |
1044 | * Restart interrupted system call. | |
1045 | */ | |
1046 | if (errno == EINTR) { | |
1047 | goto restart; | |
1048 | } | |
099e26bd DG |
1049 | goto error; |
1050 | } | |
1051 | ||
5eb91c98 DG |
1052 | for (i = 0; i < nb_fd; i++) { |
1053 | /* Fetch once the poll data */ | |
1054 | revents = LTTNG_POLL_GETEV(&events, i); | |
1055 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
1056 | ||
1057 | /* Thread quit pipe has been closed. Killing thread. */ | |
1058 | ret = check_thread_quit_pipe(pollfd, revents); | |
1059 | if (ret) { | |
099e26bd | 1060 | goto error; |
5eb91c98 | 1061 | } |
099e26bd | 1062 | |
5eb91c98 DG |
1063 | /* Inspect the apps cmd pipe */ |
1064 | if (pollfd == apps_cmd_pipe[0]) { | |
1065 | if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { | |
1066 | ERR("Apps command pipe error"); | |
0177d773 | 1067 | goto error; |
5eb91c98 DG |
1068 | } else if (revents & LPOLLIN) { |
1069 | /* Empty pipe */ | |
1070 | ret = read(apps_cmd_pipe[0], &ust_cmd, sizeof(ust_cmd)); | |
1071 | if (ret < 0 || ret < sizeof(ust_cmd)) { | |
76d7553f | 1072 | PERROR("read apps cmd pipe"); |
5eb91c98 DG |
1073 | goto error; |
1074 | } | |
099e26bd | 1075 | |
5eb91c98 | 1076 | /* Register applicaton to the session daemon */ |
56fff090 | 1077 | ret = ust_app_register(&ust_cmd.reg_msg, |
54d01ffb | 1078 | ust_cmd.sock); |
88ff5b7f | 1079 | if (ret == -ENOMEM) { |
5eb91c98 | 1080 | goto error; |
88ff5b7f MD |
1081 | } else if (ret < 0) { |
1082 | break; | |
5eb91c98 DG |
1083 | } |
1084 | ||
acc7b41b | 1085 | /* |
e0c7ec2b | 1086 | * Validate UST version compatibility. |
acc7b41b | 1087 | */ |
e0c7ec2b DG |
1088 | ret = ust_app_validate_version(ust_cmd.sock); |
1089 | if (ret >= 0) { | |
1090 | /* | |
1091 | * Add channel(s) and event(s) to newly registered apps | |
1092 | * from lttng global UST domain. | |
1093 | */ | |
1094 | update_ust_app(ust_cmd.sock); | |
1095 | } | |
acc7b41b | 1096 | |
f2ca2e25 | 1097 | ret = ust_app_register_done(ust_cmd.sock); |
5eb91c98 DG |
1098 | if (ret < 0) { |
1099 | /* | |
1100 | * If the registration is not possible, we simply | |
1101 | * unregister the apps and continue | |
1102 | */ | |
56fff090 | 1103 | ust_app_unregister(ust_cmd.sock); |
5eb91c98 DG |
1104 | } else { |
1105 | /* | |
1106 | * We just need here to monitor the close of the UST | |
1107 | * socket and poll set monitor those by default. | |
a9ade966 MD |
1108 | * Listen on POLLIN (even if we never expect any |
1109 | * data) to ensure that hangup wakes us. | |
5eb91c98 | 1110 | */ |
a9ade966 | 1111 | ret = lttng_poll_add(&events, ust_cmd.sock, LPOLLIN); |
5eb91c98 DG |
1112 | if (ret < 0) { |
1113 | goto error; | |
1114 | } | |
1115 | ||
54d01ffb DG |
1116 | DBG("Apps with sock %d added to poll set", |
1117 | ust_cmd.sock); | |
5eb91c98 | 1118 | } |
487cf67c | 1119 | |
5eb91c98 | 1120 | break; |
0177d773 | 1121 | } |
5eb91c98 DG |
1122 | } else { |
1123 | /* | |
54d01ffb DG |
1124 | * At this point, we know that a registered application made |
1125 | * the event at poll_wait. | |
5eb91c98 DG |
1126 | */ |
1127 | if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { | |
1128 | /* Removing from the poll set */ | |
1129 | ret = lttng_poll_del(&events, pollfd); | |
1130 | if (ret < 0) { | |
1131 | goto error; | |
1132 | } | |
099e26bd | 1133 | |
b9d9b220 | 1134 | /* Socket closed on remote end. */ |
56fff090 | 1135 | ust_app_unregister(pollfd); |
5eb91c98 DG |
1136 | break; |
1137 | } | |
099e26bd DG |
1138 | } |
1139 | } | |
099e26bd DG |
1140 | } |
1141 | ||
1142 | error: | |
5eb91c98 | 1143 | lttng_poll_clean(&events); |
76d7553f MD |
1144 | error_poll_create: |
1145 | DBG("Application communication apps thread cleanup complete"); | |
f6a9efaa DG |
1146 | rcu_thread_offline(); |
1147 | rcu_unregister_thread(); | |
099e26bd DG |
1148 | return NULL; |
1149 | } | |
1150 | ||
1151 | /* | |
1152 | * Dispatch request from the registration threads to the application | |
1153 | * communication thread. | |
1154 | */ | |
1155 | static void *thread_dispatch_ust_registration(void *data) | |
1156 | { | |
1157 | int ret; | |
1158 | struct cds_wfq_node *node; | |
1159 | struct ust_command *ust_cmd = NULL; | |
1160 | ||
1161 | DBG("[thread] Dispatch UST command started"); | |
1162 | ||
1163 | while (!dispatch_thread_exit) { | |
1164 | /* Atomically prepare the queue futex */ | |
1165 | futex_nto1_prepare(&ust_cmd_queue.futex); | |
1166 | ||
1167 | do { | |
1168 | /* Dequeue command for registration */ | |
1169 | node = cds_wfq_dequeue_blocking(&ust_cmd_queue.queue); | |
1170 | if (node == NULL) { | |
00a17c97 | 1171 | DBG("Woken up but nothing in the UST command queue"); |
099e26bd DG |
1172 | /* Continue thread execution */ |
1173 | break; | |
1174 | } | |
1175 | ||
1176 | ust_cmd = caa_container_of(node, struct ust_command, node); | |
1177 | ||
2f50c8a3 DG |
1178 | DBG("Dispatching UST registration pid:%d ppid:%d uid:%d" |
1179 | " gid:%d sock:%d name:%s (version %d.%d)", | |
1180 | ust_cmd->reg_msg.pid, ust_cmd->reg_msg.ppid, | |
1181 | ust_cmd->reg_msg.uid, ust_cmd->reg_msg.gid, | |
1182 | ust_cmd->sock, ust_cmd->reg_msg.name, | |
1183 | ust_cmd->reg_msg.major, ust_cmd->reg_msg.minor); | |
099e26bd DG |
1184 | /* |
1185 | * Inform apps thread of the new application registration. This | |
1186 | * call is blocking so we can be assured that the data will be read | |
1187 | * at some point in time or wait to the end of the world :) | |
1188 | */ | |
1189 | ret = write(apps_cmd_pipe[1], ust_cmd, | |
1190 | sizeof(struct ust_command)); | |
1191 | if (ret < 0) { | |
76d7553f | 1192 | PERROR("write apps cmd pipe"); |
099e26bd DG |
1193 | if (errno == EBADF) { |
1194 | /* | |
1195 | * We can't inform the application thread to process | |
1196 | * registration. We will exit or else application | |
1197 | * registration will not occur and tracing will never | |
1198 | * start. | |
1199 | */ | |
1200 | goto error; | |
1201 | } | |
1202 | } | |
1203 | free(ust_cmd); | |
1204 | } while (node != NULL); | |
1205 | ||
1206 | /* Futex wait on queue. Blocking call on futex() */ | |
1207 | futex_nto1_wait(&ust_cmd_queue.futex); | |
1208 | } | |
1209 | ||
1210 | error: | |
1211 | DBG("Dispatch thread dying"); | |
1212 | return NULL; | |
1213 | } | |
1214 | ||
1215 | /* | |
1216 | * This thread manage application registration. | |
1217 | */ | |
1218 | static void *thread_registration_apps(void *data) | |
1d4b027a | 1219 | { |
a4b35e07 | 1220 | int sock = -1, i, ret, pollfd; |
5eb91c98 DG |
1221 | uint32_t revents, nb_fd; |
1222 | struct lttng_poll_event events; | |
099e26bd DG |
1223 | /* |
1224 | * Get allocated in this thread, enqueued to a global queue, dequeued and | |
1225 | * freed in the manage apps thread. | |
1226 | */ | |
1227 | struct ust_command *ust_cmd = NULL; | |
1d4b027a | 1228 | |
099e26bd | 1229 | DBG("[thread] Manage application registration started"); |
1d4b027a DG |
1230 | |
1231 | ret = lttcomm_listen_unix_sock(apps_sock); | |
1232 | if (ret < 0) { | |
76d7553f | 1233 | goto error_listen; |
1d4b027a DG |
1234 | } |
1235 | ||
5eb91c98 DG |
1236 | /* |
1237 | * Pass 2 as size here for the thread quit pipe and apps socket. Nothing | |
1238 | * more will be added to this poll set. | |
1239 | */ | |
1240 | ret = create_thread_poll_set(&events, 2); | |
1241 | if (ret < 0) { | |
76d7553f | 1242 | goto error_create_poll; |
5eb91c98 | 1243 | } |
273ea72c | 1244 | |
5eb91c98 DG |
1245 | /* Add the application registration socket */ |
1246 | ret = lttng_poll_add(&events, apps_sock, LPOLLIN | LPOLLRDHUP); | |
1247 | if (ret < 0) { | |
76d7553f | 1248 | goto error_poll_add; |
5eb91c98 | 1249 | } |
273ea72c | 1250 | |
1d4b027a | 1251 | /* Notify all applications to register */ |
0fdd1e2c DG |
1252 | ret = notify_ust_apps(1); |
1253 | if (ret < 0) { | |
1254 | ERR("Failed to notify applications or create the wait shared memory.\n" | |
54d01ffb DG |
1255 | "Execution continues but there might be problem for already\n" |
1256 | "running applications that wishes to register."); | |
0fdd1e2c | 1257 | } |
1d4b027a DG |
1258 | |
1259 | while (1) { | |
1260 | DBG("Accepting application registration"); | |
273ea72c | 1261 | |
5eb91c98 DG |
1262 | nb_fd = LTTNG_POLL_GETNB(&events); |
1263 | ||
273ea72c | 1264 | /* Inifinite blocking call, waiting for transmission */ |
88f2b785 | 1265 | restart: |
5eb91c98 | 1266 | ret = lttng_poll_wait(&events, -1); |
273ea72c | 1267 | if (ret < 0) { |
88f2b785 MD |
1268 | /* |
1269 | * Restart interrupted system call. | |
1270 | */ | |
1271 | if (errno == EINTR) { | |
1272 | goto restart; | |
1273 | } | |
273ea72c DG |
1274 | goto error; |
1275 | } | |
1276 | ||
5eb91c98 DG |
1277 | for (i = 0; i < nb_fd; i++) { |
1278 | /* Fetch once the poll data */ | |
1279 | revents = LTTNG_POLL_GETEV(&events, i); | |
1280 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
273ea72c | 1281 | |
5eb91c98 DG |
1282 | /* Thread quit pipe has been closed. Killing thread. */ |
1283 | ret = check_thread_quit_pipe(pollfd, revents); | |
1284 | if (ret) { | |
90014c57 DG |
1285 | goto error; |
1286 | } | |
1d4b027a | 1287 | |
5eb91c98 DG |
1288 | /* Event on the registration socket */ |
1289 | if (pollfd == apps_sock) { | |
1290 | if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { | |
1291 | ERR("Register apps socket poll error"); | |
1292 | goto error; | |
1293 | } else if (revents & LPOLLIN) { | |
1294 | sock = lttcomm_accept_unix_sock(apps_sock); | |
1295 | if (sock < 0) { | |
1296 | goto error; | |
1297 | } | |
099e26bd | 1298 | |
5eb91c98 | 1299 | /* Create UST registration command for enqueuing */ |
ba7f0ae5 | 1300 | ust_cmd = zmalloc(sizeof(struct ust_command)); |
5eb91c98 | 1301 | if (ust_cmd == NULL) { |
76d7553f | 1302 | PERROR("ust command zmalloc"); |
5eb91c98 DG |
1303 | goto error; |
1304 | } | |
1d4b027a | 1305 | |
5eb91c98 DG |
1306 | /* |
1307 | * Using message-based transmissions to ensure we don't | |
1308 | * have to deal with partially received messages. | |
1309 | */ | |
4063050c MD |
1310 | ret = lttng_fd_get(LTTNG_FD_APPS, 1); |
1311 | if (ret < 0) { | |
1312 | ERR("Exhausted file descriptors allowed for applications."); | |
1313 | free(ust_cmd); | |
1314 | ret = close(sock); | |
1315 | if (ret) { | |
1316 | PERROR("close"); | |
1317 | } | |
1318 | sock = -1; | |
1319 | continue; | |
1320 | } | |
5eb91c98 DG |
1321 | ret = lttcomm_recv_unix_sock(sock, &ust_cmd->reg_msg, |
1322 | sizeof(struct ust_register_msg)); | |
1323 | if (ret < 0 || ret < sizeof(struct ust_register_msg)) { | |
1324 | if (ret < 0) { | |
76d7553f | 1325 | PERROR("lttcomm_recv_unix_sock register apps"); |
5eb91c98 DG |
1326 | } else { |
1327 | ERR("Wrong size received on apps register"); | |
1328 | } | |
1329 | free(ust_cmd); | |
76d7553f MD |
1330 | ret = close(sock); |
1331 | if (ret) { | |
1332 | PERROR("close"); | |
1333 | } | |
4063050c | 1334 | lttng_fd_put(LTTNG_FD_APPS, 1); |
76d7553f | 1335 | sock = -1; |
5eb91c98 DG |
1336 | continue; |
1337 | } | |
099e26bd | 1338 | |
5eb91c98 | 1339 | ust_cmd->sock = sock; |
34a2494f | 1340 | sock = -1; |
099e26bd | 1341 | |
5eb91c98 DG |
1342 | DBG("UST registration received with pid:%d ppid:%d uid:%d" |
1343 | " gid:%d sock:%d name:%s (version %d.%d)", | |
1344 | ust_cmd->reg_msg.pid, ust_cmd->reg_msg.ppid, | |
1345 | ust_cmd->reg_msg.uid, ust_cmd->reg_msg.gid, | |
1346 | ust_cmd->sock, ust_cmd->reg_msg.name, | |
1347 | ust_cmd->reg_msg.major, ust_cmd->reg_msg.minor); | |
54d01ffb | 1348 | |
5eb91c98 DG |
1349 | /* |
1350 | * Lock free enqueue the registration request. The red pill | |
54d01ffb | 1351 | * has been taken! This apps will be part of the *system*. |
5eb91c98 DG |
1352 | */ |
1353 | cds_wfq_enqueue(&ust_cmd_queue.queue, &ust_cmd->node); | |
1354 | ||
1355 | /* | |
1356 | * Wake the registration queue futex. Implicit memory | |
1357 | * barrier with the exchange in cds_wfq_enqueue. | |
1358 | */ | |
1359 | futex_nto1_wake(&ust_cmd_queue.futex); | |
1360 | } | |
1361 | } | |
90014c57 | 1362 | } |
1d4b027a DG |
1363 | } |
1364 | ||
1365 | error: | |
0fdd1e2c DG |
1366 | /* Notify that the registration thread is gone */ |
1367 | notify_ust_apps(0); | |
1368 | ||
a4b35e07 | 1369 | if (apps_sock >= 0) { |
76d7553f MD |
1370 | ret = close(apps_sock); |
1371 | if (ret) { | |
1372 | PERROR("close"); | |
1373 | } | |
a4b35e07 | 1374 | } |
46c3f085 | 1375 | if (sock >= 0) { |
76d7553f MD |
1376 | ret = close(sock); |
1377 | if (ret) { | |
1378 | PERROR("close"); | |
1379 | } | |
4063050c | 1380 | lttng_fd_put(LTTNG_FD_APPS, 1); |
a4b35e07 | 1381 | } |
273ea72c | 1382 | unlink(apps_unix_sock_path); |
0fdd1e2c | 1383 | |
76d7553f | 1384 | error_poll_add: |
5eb91c98 | 1385 | lttng_poll_clean(&events); |
76d7553f MD |
1386 | error_listen: |
1387 | error_create_poll: | |
1388 | DBG("UST Registration thread cleanup complete"); | |
5eb91c98 | 1389 | |
1d4b027a DG |
1390 | return NULL; |
1391 | } | |
1392 | ||
8c0faa1d | 1393 | /* |
3bd1e081 | 1394 | * Start the thread_manage_consumer. This must be done after a lttng-consumerd |
d063d709 | 1395 | * exec or it will fails. |
8c0faa1d | 1396 | */ |
3bd1e081 | 1397 | static int spawn_consumer_thread(struct consumer_data *consumer_data) |
8c0faa1d DG |
1398 | { |
1399 | int ret; | |
ee0b0061 DG |
1400 | struct timespec timeout; |
1401 | ||
1402 | timeout.tv_sec = DEFAULT_SEM_WAIT_TIMEOUT; | |
1403 | timeout.tv_nsec = 0; | |
8c0faa1d DG |
1404 | |
1405 | /* Setup semaphore */ | |
3bd1e081 | 1406 | ret = sem_init(&consumer_data->sem, 0, 0); |
ee0b0061 | 1407 | if (ret < 0) { |
3bd1e081 | 1408 | PERROR("sem_init consumer semaphore"); |
ee0b0061 DG |
1409 | goto error; |
1410 | } | |
8c0faa1d | 1411 | |
3bd1e081 MD |
1412 | ret = pthread_create(&consumer_data->thread, NULL, |
1413 | thread_manage_consumer, consumer_data); | |
8c0faa1d | 1414 | if (ret != 0) { |
3bd1e081 | 1415 | PERROR("pthread_create consumer"); |
ee0b0061 | 1416 | ret = -1; |
8c0faa1d DG |
1417 | goto error; |
1418 | } | |
1419 | ||
ee0b0061 DG |
1420 | /* Get time for sem_timedwait absolute timeout */ |
1421 | ret = clock_gettime(CLOCK_REALTIME, &timeout); | |
1422 | if (ret < 0) { | |
3bd1e081 | 1423 | PERROR("clock_gettime spawn consumer"); |
ee0b0061 | 1424 | /* Infinite wait for the kconsumerd thread to be ready */ |
3bd1e081 | 1425 | ret = sem_wait(&consumer_data->sem); |
ee0b0061 DG |
1426 | } else { |
1427 | /* Normal timeout if the gettime was successful */ | |
1428 | timeout.tv_sec += DEFAULT_SEM_WAIT_TIMEOUT; | |
3bd1e081 | 1429 | ret = sem_timedwait(&consumer_data->sem, &timeout); |
ee0b0061 | 1430 | } |
8c0faa1d | 1431 | |
ee0b0061 DG |
1432 | if (ret < 0) { |
1433 | if (errno == ETIMEDOUT) { | |
1434 | /* | |
1435 | * Call has timed out so we kill the kconsumerd_thread and return | |
1436 | * an error. | |
1437 | */ | |
3bd1e081 MD |
1438 | ERR("The consumer thread was never ready. Killing it"); |
1439 | ret = pthread_cancel(consumer_data->thread); | |
ee0b0061 | 1440 | if (ret < 0) { |
3bd1e081 | 1441 | PERROR("pthread_cancel consumer thread"); |
ee0b0061 DG |
1442 | } |
1443 | } else { | |
3bd1e081 | 1444 | PERROR("semaphore wait failed consumer thread"); |
ee0b0061 DG |
1445 | } |
1446 | goto error; | |
1447 | } | |
1448 | ||
3bd1e081 MD |
1449 | pthread_mutex_lock(&consumer_data->pid_mutex); |
1450 | if (consumer_data->pid == 0) { | |
712ea556 | 1451 | ERR("Kconsumerd did not start"); |
3bd1e081 | 1452 | pthread_mutex_unlock(&consumer_data->pid_mutex); |
712ea556 DG |
1453 | goto error; |
1454 | } | |
3bd1e081 | 1455 | pthread_mutex_unlock(&consumer_data->pid_mutex); |
712ea556 | 1456 | |
8c0faa1d DG |
1457 | return 0; |
1458 | ||
1459 | error: | |
1460 | return ret; | |
1461 | } | |
1462 | ||
d9800920 | 1463 | /* |
3bd1e081 | 1464 | * Join consumer thread |
d9800920 | 1465 | */ |
3bd1e081 | 1466 | static int join_consumer_thread(struct consumer_data *consumer_data) |
cf3af59e MD |
1467 | { |
1468 | void *status; | |
1469 | int ret; | |
1470 | ||
3bd1e081 MD |
1471 | if (consumer_data->pid != 0) { |
1472 | ret = kill(consumer_data->pid, SIGTERM); | |
cf3af59e | 1473 | if (ret) { |
3bd1e081 | 1474 | ERR("Error killing consumer daemon"); |
cf3af59e MD |
1475 | return ret; |
1476 | } | |
3bd1e081 | 1477 | return pthread_join(consumer_data->thread, &status); |
cf3af59e MD |
1478 | } else { |
1479 | return 0; | |
1480 | } | |
1481 | } | |
1482 | ||
8c0faa1d | 1483 | /* |
3bd1e081 | 1484 | * Fork and exec a consumer daemon (consumerd). |
8c0faa1d | 1485 | * |
d063d709 | 1486 | * Return pid if successful else -1. |
8c0faa1d | 1487 | */ |
3bd1e081 | 1488 | static pid_t spawn_consumerd(struct consumer_data *consumer_data) |
8c0faa1d DG |
1489 | { |
1490 | int ret; | |
1491 | pid_t pid; | |
94c55f17 | 1492 | const char *consumer_to_use; |
53086306 | 1493 | const char *verbosity; |
94c55f17 | 1494 | struct stat st; |
8c0faa1d | 1495 | |
3bd1e081 | 1496 | DBG("Spawning consumerd"); |
c49dc785 | 1497 | |
8c0faa1d DG |
1498 | pid = fork(); |
1499 | if (pid == 0) { | |
1500 | /* | |
3bd1e081 | 1501 | * Exec consumerd. |
8c0faa1d | 1502 | */ |
daee5345 | 1503 | if (opt_verbose_consumer) { |
53086306 DG |
1504 | verbosity = "--verbose"; |
1505 | } else { | |
1506 | verbosity = "--quiet"; | |
1507 | } | |
3bd1e081 MD |
1508 | switch (consumer_data->type) { |
1509 | case LTTNG_CONSUMER_KERNEL: | |
94c55f17 | 1510 | /* |
c7704d57 DG |
1511 | * Find out which consumerd to execute. We will first try the |
1512 | * 64-bit path, then the sessiond's installation directory, and | |
1513 | * fallback on the 32-bit one, | |
94c55f17 | 1514 | */ |
63a799e8 AM |
1515 | DBG3("Looking for a kernel consumer at these locations:"); |
1516 | DBG3(" 1) %s", consumerd64_bin); | |
1517 | DBG3(" 2) %s/%s", INSTALL_BIN_PATH, CONSUMERD_FILE); | |
1518 | DBG3(" 3) %s", consumerd32_bin); | |
94c55f17 | 1519 | if (stat(consumerd64_bin, &st) == 0) { |
63a799e8 | 1520 | DBG3("Found location #1"); |
94c55f17 | 1521 | consumer_to_use = consumerd64_bin; |
94c55f17 | 1522 | } else if (stat(INSTALL_BIN_PATH "/" CONSUMERD_FILE, &st) == 0) { |
63a799e8 | 1523 | DBG3("Found location #2"); |
94c55f17 | 1524 | consumer_to_use = INSTALL_BIN_PATH "/" CONSUMERD_FILE; |
eb1e0bd4 | 1525 | } else if (stat(consumerd32_bin, &st) == 0) { |
63a799e8 | 1526 | DBG3("Found location #3"); |
eb1e0bd4 | 1527 | consumer_to_use = consumerd32_bin; |
94c55f17 | 1528 | } else { |
63a799e8 | 1529 | DBG("Could not find any valid consumerd executable"); |
94c55f17 AM |
1530 | break; |
1531 | } | |
1532 | DBG("Using kernel consumer at: %s", consumer_to_use); | |
1533 | execl(consumer_to_use, | |
1534 | "lttng-consumerd", verbosity, "-k", | |
1535 | "--consumerd-cmd-sock", consumer_data->cmd_unix_sock_path, | |
1536 | "--consumerd-err-sock", consumer_data->err_unix_sock_path, | |
1537 | NULL); | |
3bd1e081 | 1538 | break; |
7753dea8 MD |
1539 | case LTTNG_CONSUMER64_UST: |
1540 | { | |
b1e0b6b6 | 1541 | char *tmpnew = NULL; |
8f4905da MD |
1542 | |
1543 | if (consumerd64_libdir[0] != '\0') { | |
1544 | char *tmp; | |
1545 | size_t tmplen; | |
1546 | ||
1547 | tmp = getenv("LD_LIBRARY_PATH"); | |
1548 | if (!tmp) { | |
1549 | tmp = ""; | |
1550 | } | |
1551 | tmplen = strlen("LD_LIBRARY_PATH=") | |
1552 | + strlen(consumerd64_libdir) + 1 /* : */ + strlen(tmp); | |
1553 | tmpnew = zmalloc(tmplen + 1 /* \0 */); | |
1554 | if (!tmpnew) { | |
1555 | ret = -ENOMEM; | |
1556 | goto error; | |
1557 | } | |
1558 | strcpy(tmpnew, "LD_LIBRARY_PATH="); | |
1559 | strcat(tmpnew, consumerd64_libdir); | |
1560 | if (tmp[0] != '\0') { | |
1561 | strcat(tmpnew, ":"); | |
1562 | strcat(tmpnew, tmp); | |
1563 | } | |
1564 | ret = putenv(tmpnew); | |
1565 | if (ret) { | |
1566 | ret = -errno; | |
1567 | goto error; | |
1568 | } | |
1569 | } | |
94c55f17 | 1570 | DBG("Using 64-bit UST consumer at: %s", consumerd64_bin); |
a5a6aff3 | 1571 | ret = execl(consumerd64_bin, "lttng-consumerd", verbosity, "-u", |
7753dea8 MD |
1572 | "--consumerd-cmd-sock", consumer_data->cmd_unix_sock_path, |
1573 | "--consumerd-err-sock", consumer_data->err_unix_sock_path, | |
1574 | NULL); | |
8f4905da MD |
1575 | if (consumerd64_libdir[0] != '\0') { |
1576 | free(tmpnew); | |
1577 | } | |
1578 | if (ret) { | |
1579 | goto error; | |
1580 | } | |
3bd1e081 | 1581 | break; |
7753dea8 MD |
1582 | } |
1583 | case LTTNG_CONSUMER32_UST: | |
1584 | { | |
937dde8e | 1585 | char *tmpnew = NULL; |
8f4905da MD |
1586 | |
1587 | if (consumerd32_libdir[0] != '\0') { | |
1588 | char *tmp; | |
1589 | size_t tmplen; | |
1590 | ||
1591 | tmp = getenv("LD_LIBRARY_PATH"); | |
1592 | if (!tmp) { | |
1593 | tmp = ""; | |
1594 | } | |
1595 | tmplen = strlen("LD_LIBRARY_PATH=") | |
1596 | + strlen(consumerd32_libdir) + 1 /* : */ + strlen(tmp); | |
1597 | tmpnew = zmalloc(tmplen + 1 /* \0 */); | |
1598 | if (!tmpnew) { | |
1599 | ret = -ENOMEM; | |
1600 | goto error; | |
1601 | } | |
1602 | strcpy(tmpnew, "LD_LIBRARY_PATH="); | |
1603 | strcat(tmpnew, consumerd32_libdir); | |
1604 | if (tmp[0] != '\0') { | |
1605 | strcat(tmpnew, ":"); | |
1606 | strcat(tmpnew, tmp); | |
1607 | } | |
1608 | ret = putenv(tmpnew); | |
1609 | if (ret) { | |
1610 | ret = -errno; | |
1611 | goto error; | |
1612 | } | |
1613 | } | |
94c55f17 | 1614 | DBG("Using 32-bit UST consumer at: %s", consumerd32_bin); |
a5a6aff3 | 1615 | ret = execl(consumerd32_bin, "lttng-consumerd", verbosity, "-u", |
7753dea8 MD |
1616 | "--consumerd-cmd-sock", consumer_data->cmd_unix_sock_path, |
1617 | "--consumerd-err-sock", consumer_data->err_unix_sock_path, | |
1618 | NULL); | |
8f4905da MD |
1619 | if (consumerd32_libdir[0] != '\0') { |
1620 | free(tmpnew); | |
1621 | } | |
1622 | if (ret) { | |
1623 | goto error; | |
1624 | } | |
7753dea8 MD |
1625 | break; |
1626 | } | |
3bd1e081 | 1627 | default: |
76d7553f | 1628 | PERROR("unknown consumer type"); |
3bd1e081 MD |
1629 | exit(EXIT_FAILURE); |
1630 | } | |
8c0faa1d | 1631 | if (errno != 0) { |
76d7553f | 1632 | PERROR("kernel start consumer exec"); |
8c0faa1d DG |
1633 | } |
1634 | exit(EXIT_FAILURE); | |
1635 | } else if (pid > 0) { | |
1636 | ret = pid; | |
8c0faa1d | 1637 | } else { |
76d7553f | 1638 | PERROR("start consumer fork"); |
8c0faa1d | 1639 | ret = -errno; |
8c0faa1d | 1640 | } |
8f4905da | 1641 | error: |
8c0faa1d DG |
1642 | return ret; |
1643 | } | |
1644 | ||
693bd40b | 1645 | /* |
3bd1e081 | 1646 | * Spawn the consumerd daemon and session daemon thread. |
693bd40b | 1647 | */ |
3bd1e081 | 1648 | static int start_consumerd(struct consumer_data *consumer_data) |
693bd40b DG |
1649 | { |
1650 | int ret; | |
1651 | ||
3bd1e081 MD |
1652 | pthread_mutex_lock(&consumer_data->pid_mutex); |
1653 | if (consumer_data->pid != 0) { | |
1654 | pthread_mutex_unlock(&consumer_data->pid_mutex); | |
c49dc785 DG |
1655 | goto end; |
1656 | } | |
693bd40b | 1657 | |
3bd1e081 | 1658 | ret = spawn_consumerd(consumer_data); |
c49dc785 | 1659 | if (ret < 0) { |
3bd1e081 MD |
1660 | ERR("Spawning consumerd failed"); |
1661 | pthread_mutex_unlock(&consumer_data->pid_mutex); | |
c49dc785 | 1662 | goto error; |
693bd40b | 1663 | } |
c49dc785 | 1664 | |
3bd1e081 MD |
1665 | /* Setting up the consumer_data pid */ |
1666 | consumer_data->pid = ret; | |
48842b30 | 1667 | DBG2("Consumer pid %d", consumer_data->pid); |
3bd1e081 | 1668 | pthread_mutex_unlock(&consumer_data->pid_mutex); |
693bd40b | 1669 | |
3bd1e081 MD |
1670 | DBG2("Spawning consumer control thread"); |
1671 | ret = spawn_consumer_thread(consumer_data); | |
693bd40b | 1672 | if (ret < 0) { |
3bd1e081 | 1673 | ERR("Fatal error spawning consumer control thread"); |
693bd40b DG |
1674 | goto error; |
1675 | } | |
1676 | ||
c49dc785 | 1677 | end: |
693bd40b DG |
1678 | return 0; |
1679 | ||
1680 | error: | |
1681 | return ret; | |
1682 | } | |
1683 | ||
b73401da | 1684 | /* |
096102bd | 1685 | * Check version of the lttng-modules. |
b73401da | 1686 | */ |
096102bd | 1687 | static int validate_lttng_modules_version(void) |
b73401da | 1688 | { |
096102bd | 1689 | return kernel_validate_version(kernel_tracer_fd); |
ab147185 MD |
1690 | } |
1691 | ||
b73401da | 1692 | /* |
096102bd | 1693 | * Setup necessary data for kernel tracer action. |
b73401da | 1694 | */ |
096102bd | 1695 | static int init_kernel_tracer(void) |
b73401da DG |
1696 | { |
1697 | int ret; | |
b73401da | 1698 | |
096102bd DG |
1699 | /* Modprobe lttng kernel modules */ |
1700 | ret = modprobe_lttng_control(); | |
b73401da | 1701 | if (ret < 0) { |
b73401da DG |
1702 | goto error; |
1703 | } | |
1704 | ||
096102bd DG |
1705 | /* Open debugfs lttng */ |
1706 | kernel_tracer_fd = open(module_proc_lttng, O_RDWR); | |
1707 | if (kernel_tracer_fd < 0) { | |
1708 | DBG("Failed to open %s", module_proc_lttng); | |
1709 | ret = -1; | |
1710 | goto error_open; | |
b73401da DG |
1711 | } |
1712 | ||
096102bd DG |
1713 | /* Validate kernel version */ |
1714 | ret = validate_lttng_modules_version(); | |
b73401da | 1715 | if (ret < 0) { |
096102bd | 1716 | goto error_version; |
b73401da DG |
1717 | } |
1718 | ||
096102bd | 1719 | ret = modprobe_lttng_data(); |
b73401da | 1720 | if (ret < 0) { |
096102bd | 1721 | goto error_modules; |
8c0faa1d DG |
1722 | } |
1723 | ||
f3ed775e | 1724 | DBG("Kernel tracer fd %d", kernel_tracer_fd); |
096102bd DG |
1725 | return 0; |
1726 | ||
1727 | error_version: | |
1728 | modprobe_remove_lttng_control(); | |
76d7553f MD |
1729 | ret = close(kernel_tracer_fd); |
1730 | if (ret) { | |
1731 | PERROR("close"); | |
1732 | } | |
1733 | kernel_tracer_fd = -1; | |
096102bd DG |
1734 | return LTTCOMM_KERN_VERSION; |
1735 | ||
1736 | error_modules: | |
76d7553f MD |
1737 | ret = close(kernel_tracer_fd); |
1738 | if (ret) { | |
1739 | PERROR("close"); | |
1740 | } | |
096102bd DG |
1741 | |
1742 | error_open: | |
1743 | modprobe_remove_lttng_control(); | |
b73401da DG |
1744 | |
1745 | error: | |
b73401da | 1746 | WARN("No kernel tracer available"); |
a4b35e07 | 1747 | kernel_tracer_fd = -1; |
531d29f9 MD |
1748 | if (!is_root) { |
1749 | return LTTCOMM_NEED_ROOT_SESSIOND; | |
1750 | } else { | |
1751 | return LTTCOMM_KERN_NA; | |
1752 | } | |
f3ed775e | 1753 | } |
33a2b854 | 1754 | |
f3ed775e | 1755 | /* |
54d01ffb | 1756 | * Init tracing by creating trace directory and sending fds kernel consumer. |
f3ed775e | 1757 | */ |
54d01ffb | 1758 | static int init_kernel_tracing(struct ltt_kernel_session *session) |
f3ed775e | 1759 | { |
f40799e8 | 1760 | int ret = 0; |
8c0faa1d | 1761 | |
00e2e675 | 1762 | if (session->consumer_fds_sent == 0 && session->consumer != NULL) { |
d9800920 | 1763 | /* |
54d01ffb | 1764 | * Assign default kernel consumer socket if no consumer assigned to the |
03550b58 | 1765 | * kernel session. At this point, it's NOT supposed to be -1 but this is |
54d01ffb | 1766 | * an extra security check. |
d9800920 | 1767 | */ |
03550b58 | 1768 | if (session->consumer_fd < 0) { |
3bd1e081 | 1769 | session->consumer_fd = kconsumer_data.cmd_sock; |
d9800920 DG |
1770 | } |
1771 | ||
00e2e675 | 1772 | ret = kernel_consumer_send_session(session->consumer_fd, session); |
f3ed775e | 1773 | if (ret < 0) { |
f3ed775e DG |
1774 | ret = LTTCOMM_KERN_CONSUMER_FAIL; |
1775 | goto error; | |
1776 | } | |
00e2e675 | 1777 | } |
1d4b027a | 1778 | |
00e2e675 DG |
1779 | error: |
1780 | return ret; | |
1781 | } | |
1782 | ||
1783 | /* | |
1784 | * Create a socket to the relayd using the URI. | |
1785 | * | |
1786 | * On success, the relayd_sock pointer is set to the created socket. | |
1787 | * Else, it is untouched and an lttcomm error code is returned. | |
1788 | */ | |
1789 | static int create_connect_relayd(struct consumer_output *output, | |
1790 | const char *session_name, struct lttng_uri *uri, | |
1791 | struct lttcomm_sock **relayd_sock) | |
1792 | { | |
1793 | int ret; | |
1794 | struct lttcomm_sock *sock; | |
1795 | ||
1796 | /* Create socket object from URI */ | |
1797 | sock = lttcomm_alloc_sock_from_uri(uri); | |
1798 | if (sock == NULL) { | |
1799 | ret = LTTCOMM_FATAL; | |
1800 | goto error; | |
1801 | } | |
1802 | ||
1803 | ret = lttcomm_create_sock(sock); | |
1804 | if (ret < 0) { | |
1805 | ret = LTTCOMM_FATAL; | |
1806 | goto error; | |
1807 | } | |
1808 | ||
1809 | /* Connect to relayd so we can proceed with a session creation. */ | |
1810 | ret = relayd_connect(sock); | |
1811 | if (ret < 0) { | |
1812 | ERR("Unable to reach lttng-relayd"); | |
1813 | ret = LTTCOMM_RELAYD_SESSION_FAIL; | |
1814 | goto free_sock; | |
f3ed775e | 1815 | } |
1d4b027a | 1816 | |
00e2e675 DG |
1817 | /* Create socket for control stream. */ |
1818 | if (uri->stype == LTTNG_STREAM_CONTROL) { | |
1819 | DBG3("Creating relayd stream socket from URI"); | |
1820 | ||
1821 | /* Check relayd version */ | |
1822 | ret = relayd_version_check(sock, LTTNG_UST_COMM_MAJOR, 0); | |
1823 | if (ret < 0) { | |
1824 | ret = LTTCOMM_RELAYD_VERSION_FAIL; | |
1825 | goto close_sock; | |
1826 | } | |
1827 | } else if (uri->stype == LTTNG_STREAM_DATA) { | |
1828 | DBG3("Creating relayd data socket from URI"); | |
1829 | } else { | |
1830 | /* Command is not valid */ | |
1831 | ERR("Relayd invalid stream type: %d", uri->stype); | |
1832 | ret = LTTCOMM_INVALID; | |
1833 | goto close_sock; | |
1834 | } | |
1835 | ||
1836 | *relayd_sock = sock; | |
1837 | ||
1838 | return LTTCOMM_OK; | |
1839 | ||
1840 | close_sock: | |
1841 | if (sock) { | |
1842 | (void) relayd_close(sock); | |
1843 | } | |
1844 | free_sock: | |
1845 | if (sock) { | |
1846 | lttcomm_destroy_sock(sock); | |
1847 | } | |
1848 | error: | |
1849 | return ret; | |
1850 | } | |
1851 | ||
1852 | /* | |
1853 | * Connect to the relayd using URI and send the socket to the right consumer. | |
1854 | */ | |
1855 | static int send_socket_relayd_consumer(int domain, struct ltt_session *session, | |
1856 | struct lttng_uri *relayd_uri, struct consumer_output *consumer, | |
1857 | int consumer_fd) | |
1858 | { | |
1859 | int ret; | |
1860 | struct lttcomm_sock *sock = NULL; | |
1861 | ||
1862 | /* Set the network sequence index if not set. */ | |
1863 | if (consumer->net_seq_index == -1) { | |
1864 | /* | |
1865 | * Increment net_seq_idx because we are about to transfer the | |
1866 | * new relayd socket to the consumer. | |
1867 | */ | |
1868 | uatomic_inc(&relayd_net_seq_idx); | |
1869 | /* Assign unique key so the consumer can match streams */ | |
1870 | consumer->net_seq_index = uatomic_read(&relayd_net_seq_idx); | |
1871 | } | |
1872 | ||
1873 | /* Connect to relayd and make version check if uri is the control. */ | |
1874 | ret = create_connect_relayd(consumer, session->name, relayd_uri, &sock); | |
1875 | if (ret != LTTCOMM_OK) { | |
1876 | goto close_sock; | |
1877 | } | |
1878 | ||
1879 | /* If the control socket is connected, network session is ready */ | |
1880 | if (relayd_uri->stype == LTTNG_STREAM_CONTROL) { | |
1881 | session->net_handle = 1; | |
1882 | } | |
1883 | ||
1884 | switch (domain) { | |
1885 | case LTTNG_DOMAIN_KERNEL: | |
1886 | /* Send relayd socket to consumer. */ | |
1887 | ret = kernel_consumer_send_relayd_socket(consumer_fd, sock, | |
1888 | consumer, relayd_uri->stype); | |
1889 | if (ret < 0) { | |
1890 | ret = LTTCOMM_ENABLE_CONSUMER_FAIL; | |
1891 | goto close_sock; | |
1892 | } | |
1893 | break; | |
1894 | case LTTNG_DOMAIN_UST: | |
1895 | /* Send relayd socket to consumer. */ | |
1896 | ret = ust_consumer_send_relayd_socket(consumer_fd, sock, | |
1897 | consumer, relayd_uri->stype); | |
1898 | if (ret < 0) { | |
1899 | ret = LTTCOMM_ENABLE_CONSUMER_FAIL; | |
1900 | goto close_sock; | |
1901 | } | |
1902 | break; | |
1903 | } | |
1904 | ||
1905 | ret = LTTCOMM_OK; | |
1906 | ||
1907 | /* | |
1908 | * Close socket which was dup on the consumer side. The session daemon does | |
1909 | * NOT keep track of the relayd socket(s) once transfer to the consumer. | |
1910 | */ | |
1911 | ||
1912 | close_sock: | |
1913 | if (sock) { | |
1914 | (void) relayd_close(sock); | |
1915 | lttcomm_destroy_sock(sock); | |
1916 | } | |
1917 | ||
1918 | return ret; | |
1919 | } | |
1920 | ||
1921 | /* | |
1922 | * Send both relayd sockets to a specific consumer and domain. This is a | |
1923 | * helper function to facilitate sending the information to the consumer for a | |
1924 | * session. | |
1925 | */ | |
1926 | static int send_sockets_relayd_consumer(int domain, | |
1927 | struct ltt_session *session, struct consumer_output *consumer, int fd) | |
1928 | { | |
1929 | int ret; | |
1930 | ||
1931 | /* Sending control relayd socket. */ | |
1932 | ret = send_socket_relayd_consumer(domain, session, | |
1933 | &consumer->dst.net.control, consumer, fd); | |
1934 | if (ret != LTTCOMM_OK) { | |
1935 | goto error; | |
1936 | } | |
1937 | ||
1938 | /* Sending data relayd socket. */ | |
1939 | ret = send_socket_relayd_consumer(domain, session, | |
1940 | &consumer->dst.net.data, consumer, fd); | |
1941 | if (ret != LTTCOMM_OK) { | |
1942 | goto error; | |
1943 | } | |
1944 | ||
1945 | error: | |
1946 | return ret; | |
1947 | } | |
1948 | ||
1949 | /* | |
1950 | * Setup relayd connections for a tracing session. First creates the socket to | |
1951 | * the relayd and send them to the right domain consumer. Consumer type MUST be | |
1952 | * network. | |
1953 | */ | |
1954 | static int setup_relayd(struct ltt_session *session) | |
1955 | { | |
1956 | int ret = LTTCOMM_OK; | |
1957 | struct ltt_ust_session *usess; | |
1958 | struct ltt_kernel_session *ksess; | |
1959 | ||
1960 | assert(session); | |
1961 | ||
1962 | usess = session->ust_session; | |
1963 | ksess = session->kernel_session; | |
1964 | ||
1965 | DBG2("Setting relayd for session %s", session->name); | |
1966 | ||
1967 | if (usess && usess->consumer->sock == -1 && | |
1968 | usess->consumer->type == CONSUMER_DST_NET && | |
1969 | usess->consumer->enabled) { | |
1970 | /* Setup relayd for 64 bits consumer */ | |
1971 | if (ust_consumerd64_fd >= 0) { | |
1972 | send_sockets_relayd_consumer(LTTNG_DOMAIN_UST, session, | |
1973 | usess->consumer, ust_consumerd64_fd); | |
1974 | if (ret != LTTCOMM_OK) { | |
1975 | goto error; | |
1976 | } | |
1977 | } | |
1978 | ||
1979 | /* Setup relayd for 32 bits consumer */ | |
1980 | if (ust_consumerd32_fd >= 0) { | |
1981 | send_sockets_relayd_consumer(LTTNG_DOMAIN_UST, session, | |
1982 | usess->consumer, ust_consumerd32_fd); | |
1983 | if (ret != LTTCOMM_OK) { | |
1984 | goto error; | |
1985 | } | |
1986 | } | |
1987 | } else if (ksess && ksess->consumer->sock == -1 && | |
1988 | ksess->consumer->type == CONSUMER_DST_NET && | |
1989 | ksess->consumer->enabled) { | |
1990 | send_sockets_relayd_consumer(LTTNG_DOMAIN_KERNEL, session, | |
1991 | ksess->consumer, ksess->consumer_fd); | |
1992 | if (ret != LTTCOMM_OK) { | |
1993 | goto error; | |
1994 | } | |
1995 | } | |
1996 | ||
1997 | error: | |
1998 | return ret; | |
1999 | } | |
2000 | ||
2001 | /* | |
2002 | * Copy consumer output from the tracing session to the domain session. The | |
2003 | * function also applies the right modification on a per domain basis for the | |
2004 | * trace files destination directory. | |
2005 | */ | |
2006 | static int copy_session_consumer(int domain, struct ltt_session *session) | |
2007 | { | |
2008 | int ret; | |
2009 | const char *dir_name; | |
2010 | struct consumer_output *consumer; | |
2011 | ||
2012 | switch (domain) { | |
2013 | case LTTNG_DOMAIN_KERNEL: | |
2014 | DBG3("Copying tracing session consumer output in kernel session"); | |
2015 | session->kernel_session->consumer = | |
2016 | consumer_copy_output(session->consumer); | |
2017 | /* Ease our life a bit for the next part */ | |
2018 | consumer = session->kernel_session->consumer; | |
2019 | dir_name = DEFAULT_KERNEL_TRACE_DIR; | |
2020 | break; | |
2021 | case LTTNG_DOMAIN_UST: | |
2022 | DBG3("Copying tracing session consumer output in UST session"); | |
2023 | session->ust_session->consumer = | |
2024 | consumer_copy_output(session->consumer); | |
2025 | /* Ease our life a bit for the next part */ | |
2026 | consumer = session->ust_session->consumer; | |
2027 | dir_name = DEFAULT_UST_TRACE_DIR; | |
2028 | break; | |
2029 | default: | |
2030 | ret = LTTCOMM_UNKNOWN_DOMAIN; | |
2031 | goto error; | |
2032 | } | |
2033 | ||
2034 | /* Append correct directory to subdir */ | |
2035 | strncat(consumer->subdir, dir_name, sizeof(consumer->subdir)); | |
2036 | DBG3("Copy session consumer subdir %s", consumer->subdir); | |
2037 | ||
2038 | /* Add default trace directory name */ | |
2039 | if (consumer->type == CONSUMER_DST_LOCAL) { | |
2040 | strncat(consumer->dst.trace_path, dir_name, | |
2041 | sizeof(consumer->dst.trace_path)); | |
2042 | } | |
2043 | ||
2044 | ret = LTTCOMM_OK; | |
2045 | ||
1d4b027a DG |
2046 | error: |
2047 | return ret; | |
8c0faa1d DG |
2048 | } |
2049 | ||
0177d773 DG |
2050 | /* |
2051 | * Create an UST session and add it to the session ust list. | |
2052 | */ | |
44d3bd01 | 2053 | static int create_ust_session(struct ltt_session *session, |
6df2e2c9 | 2054 | struct lttng_domain *domain) |
0177d773 | 2055 | { |
6df2e2c9 | 2056 | int ret; |
00e2e675 DG |
2057 | struct ltt_ust_session *lus = NULL; |
2058 | ||
2059 | assert(session); | |
2060 | assert(session->consumer); | |
44d3bd01 DG |
2061 | |
2062 | switch (domain->type) { | |
48842b30 | 2063 | case LTTNG_DOMAIN_UST: |
44d3bd01 DG |
2064 | break; |
2065 | default: | |
00e2e675 | 2066 | ERR("Unknown UST domain on create session %d", domain->type); |
13384287 | 2067 | ret = LTTCOMM_UNKNOWN_DOMAIN; |
44d3bd01 DG |
2068 | goto error; |
2069 | } | |
0177d773 DG |
2070 | |
2071 | DBG("Creating UST session"); | |
2072 | ||
a991f516 | 2073 | lus = trace_ust_create_session(session->path, session->id, domain); |
0177d773 | 2074 | if (lus == NULL) { |
44d3bd01 | 2075 | ret = LTTCOMM_UST_SESS_FAIL; |
0177d773 DG |
2076 | goto error; |
2077 | } | |
2078 | ||
00e2e675 DG |
2079 | if (session->consumer->type == CONSUMER_DST_LOCAL) { |
2080 | ret = run_as_mkdir_recursive(lus->pathname, S_IRWXU | S_IRWXG, | |
2081 | session->uid, session->gid); | |
2082 | if (ret < 0) { | |
2083 | if (ret != -EEXIST) { | |
2084 | ERR("Trace directory creation error"); | |
2085 | ret = LTTCOMM_UST_SESS_FAIL; | |
2086 | goto error; | |
2087 | } | |
0177d773 DG |
2088 | } |
2089 | } | |
2090 | ||
6df2e2c9 MD |
2091 | lus->uid = session->uid; |
2092 | lus->gid = session->gid; | |
f6a9efaa | 2093 | session->ust_session = lus; |
44d3bd01 | 2094 | |
00e2e675 DG |
2095 | /* Copy session output to the newly created UST session */ |
2096 | ret = copy_session_consumer(domain->type, session); | |
2097 | if (ret != LTTCOMM_OK) { | |
2098 | goto error; | |
2099 | } | |
2100 | ||
44d3bd01 | 2101 | return LTTCOMM_OK; |
0177d773 DG |
2102 | |
2103 | error: | |
2104 | free(lus); | |
00e2e675 | 2105 | session->ust_session = NULL; |
0177d773 DG |
2106 | return ret; |
2107 | } | |
2108 | ||
333f285e | 2109 | /* |
d063d709 | 2110 | * Create a kernel tracer session then create the default channel. |
333f285e | 2111 | */ |
6df2e2c9 | 2112 | static int create_kernel_session(struct ltt_session *session) |
333f285e | 2113 | { |
f3ed775e | 2114 | int ret; |
f3ed775e DG |
2115 | |
2116 | DBG("Creating kernel session"); | |
2117 | ||
2118 | ret = kernel_create_session(session, kernel_tracer_fd); | |
2119 | if (ret < 0) { | |
2120 | ret = LTTCOMM_KERN_SESS_FAIL; | |
2121 | goto error; | |
333f285e DG |
2122 | } |
2123 | ||
d9800920 | 2124 | /* Set kernel consumer socket fd */ |
03550b58 | 2125 | if (kconsumer_data.cmd_sock >= 0) { |
3bd1e081 | 2126 | session->kernel_session->consumer_fd = kconsumer_data.cmd_sock; |
d9800920 DG |
2127 | } |
2128 | ||
00e2e675 DG |
2129 | /* Copy session output to the newly created Kernel session */ |
2130 | ret = copy_session_consumer(LTTNG_DOMAIN_KERNEL, session); | |
2131 | if (ret != LTTCOMM_OK) { | |
2132 | goto error; | |
2133 | } | |
2134 | ||
2135 | /* Create directory(ies) on local filesystem. */ | |
2136 | if (session->consumer->type == CONSUMER_DST_LOCAL) { | |
2137 | ret = run_as_mkdir_recursive( | |
2138 | session->kernel_session->consumer->dst.trace_path, | |
2139 | S_IRWXU | S_IRWXG, session->uid, session->gid); | |
2140 | if (ret < 0) { | |
2141 | if (ret != -EEXIST) { | |
2142 | ERR("Trace directory creation error"); | |
2143 | goto error; | |
2144 | } | |
7a485870 DG |
2145 | } |
2146 | } | |
00e2e675 | 2147 | |
6df2e2c9 MD |
2148 | session->kernel_session->uid = session->uid; |
2149 | session->kernel_session->gid = session->gid; | |
7a485870 | 2150 | |
00e2e675 DG |
2151 | return LTTCOMM_OK; |
2152 | ||
f3ed775e | 2153 | error: |
00e2e675 DG |
2154 | trace_kernel_destroy_session(session->kernel_session); |
2155 | session->kernel_session = NULL; | |
f3ed775e | 2156 | return ret; |
333f285e DG |
2157 | } |
2158 | ||
8e0af1b4 | 2159 | /* |
c7704d57 DG |
2160 | * Check if the UID or GID match the session. Root user has access to all |
2161 | * sessions. | |
8e0af1b4 | 2162 | */ |
c7704d57 | 2163 | static int session_access_ok(struct ltt_session *session, uid_t uid, gid_t gid) |
8e0af1b4 | 2164 | { |
c7704d57 | 2165 | if (uid != session->uid && gid != session->gid && uid != 0) { |
8e0af1b4 MD |
2166 | return 0; |
2167 | } else { | |
2168 | return 1; | |
2169 | } | |
2170 | } | |
2171 | ||
00e2e675 DG |
2172 | /* |
2173 | * Count number of session permitted by uid/gid. | |
2174 | */ | |
8e0af1b4 MD |
2175 | static unsigned int lttng_sessions_count(uid_t uid, gid_t gid) |
2176 | { | |
2177 | unsigned int i = 0; | |
2178 | struct ltt_session *session; | |
2179 | ||
2180 | DBG("Counting number of available session for UID %d GID %d", | |
2181 | uid, gid); | |
2182 | cds_list_for_each_entry(session, &session_list_ptr->head, list) { | |
2183 | /* | |
2184 | * Only list the sessions the user can control. | |
2185 | */ | |
2186 | if (!session_access_ok(session, uid, gid)) { | |
2187 | continue; | |
2188 | } | |
2189 | i++; | |
2190 | } | |
2191 | return i; | |
2192 | } | |
2193 | ||
6c9cc2ab DG |
2194 | /* |
2195 | * Using the session list, filled a lttng_session array to send back to the | |
2196 | * client for session listing. | |
2197 | * | |
2198 | * The session list lock MUST be acquired before calling this function. Use | |
54d01ffb | 2199 | * session_lock_list() and session_unlock_list(). |
6c9cc2ab | 2200 | */ |
c7704d57 DG |
2201 | static void list_lttng_sessions(struct lttng_session *sessions, uid_t uid, |
2202 | gid_t gid) | |
6c9cc2ab | 2203 | { |
8e0af1b4 | 2204 | unsigned int i = 0; |
6c9cc2ab DG |
2205 | struct ltt_session *session; |
2206 | ||
8e0af1b4 MD |
2207 | DBG("Getting all available session for UID %d GID %d", |
2208 | uid, gid); | |
6c9cc2ab DG |
2209 | /* |
2210 | * Iterate over session list and append data after the control struct in | |
2211 | * the buffer. | |
2212 | */ | |
2213 | cds_list_for_each_entry(session, &session_list_ptr->head, list) { | |
8e0af1b4 MD |
2214 | /* |
2215 | * Only list the sessions the user can control. | |
2216 | */ | |
2217 | if (!session_access_ok(session, uid, gid)) { | |
2218 | continue; | |
2219 | } | |
6c9cc2ab | 2220 | strncpy(sessions[i].path, session->path, PATH_MAX); |
99497cd0 | 2221 | sessions[i].path[PATH_MAX - 1] = '\0'; |
6c9cc2ab | 2222 | strncpy(sessions[i].name, session->name, NAME_MAX); |
99497cd0 | 2223 | sessions[i].name[NAME_MAX - 1] = '\0'; |
464dd62d | 2224 | sessions[i].enabled = session->enabled; |
6c9cc2ab DG |
2225 | i++; |
2226 | } | |
2227 | } | |
2228 | ||
9f19cc17 DG |
2229 | /* |
2230 | * Fill lttng_channel array of all channels. | |
2231 | */ | |
b551a063 | 2232 | static void list_lttng_channels(int domain, struct ltt_session *session, |
9f19cc17 DG |
2233 | struct lttng_channel *channels) |
2234 | { | |
2235 | int i = 0; | |
2236 | struct ltt_kernel_channel *kchan; | |
2237 | ||
2238 | DBG("Listing channels for session %s", session->name); | |
2239 | ||
b551a063 DG |
2240 | switch (domain) { |
2241 | case LTTNG_DOMAIN_KERNEL: | |
2242 | /* Kernel channels */ | |
2243 | if (session->kernel_session != NULL) { | |
2244 | cds_list_for_each_entry(kchan, | |
2245 | &session->kernel_session->channel_list.head, list) { | |
2246 | /* Copy lttng_channel struct to array */ | |
2247 | memcpy(&channels[i], kchan->channel, sizeof(struct lttng_channel)); | |
2248 | channels[i].enabled = kchan->enabled; | |
2249 | i++; | |
2250 | } | |
2251 | } | |
2252 | break; | |
2253 | case LTTNG_DOMAIN_UST: | |
2254 | { | |
bec39940 | 2255 | struct lttng_ht_iter iter; |
b551a063 DG |
2256 | struct ltt_ust_channel *uchan; |
2257 | ||
bec39940 DG |
2258 | cds_lfht_for_each_entry(session->ust_session->domain_global.channels->ht, |
2259 | &iter.iter, uchan, node.node) { | |
b551a063 DG |
2260 | strncpy(channels[i].name, uchan->name, LTTNG_SYMBOL_NAME_LEN); |
2261 | channels[i].attr.overwrite = uchan->attr.overwrite; | |
2262 | channels[i].attr.subbuf_size = uchan->attr.subbuf_size; | |
2263 | channels[i].attr.num_subbuf = uchan->attr.num_subbuf; | |
2264 | channels[i].attr.switch_timer_interval = | |
2265 | uchan->attr.switch_timer_interval; | |
2266 | channels[i].attr.read_timer_interval = | |
2267 | uchan->attr.read_timer_interval; | |
aea829b3 | 2268 | channels[i].enabled = uchan->enabled; |
5edd7e09 DG |
2269 | switch (uchan->attr.output) { |
2270 | case LTTNG_UST_MMAP: | |
2271 | default: | |
2272 | channels[i].attr.output = LTTNG_EVENT_MMAP; | |
2273 | break; | |
2274 | } | |
befe0905 | 2275 | i++; |
b551a063 DG |
2276 | } |
2277 | break; | |
2278 | } | |
2279 | default: | |
2280 | break; | |
2281 | } | |
2282 | } | |
2283 | ||
2284 | /* | |
2285 | * Create a list of ust global domain events. | |
2286 | */ | |
2287 | static int list_lttng_ust_global_events(char *channel_name, | |
2288 | struct ltt_ust_domain_global *ust_global, struct lttng_event **events) | |
2289 | { | |
2290 | int i = 0, ret = 0; | |
2291 | unsigned int nb_event = 0; | |
bec39940 DG |
2292 | struct lttng_ht_iter iter; |
2293 | struct lttng_ht_node_str *node; | |
b551a063 DG |
2294 | struct ltt_ust_channel *uchan; |
2295 | struct ltt_ust_event *uevent; | |
2296 | struct lttng_event *tmp; | |
2297 | ||
2298 | DBG("Listing UST global events for channel %s", channel_name); | |
2299 | ||
2300 | rcu_read_lock(); | |
2301 | ||
bec39940 DG |
2302 | lttng_ht_lookup(ust_global->channels, (void *)channel_name, &iter); |
2303 | node = lttng_ht_iter_get_node_str(&iter); | |
d7b75b30 DG |
2304 | if (node == NULL) { |
2305 | ret = -LTTCOMM_UST_CHAN_NOT_FOUND; | |
2306 | goto error; | |
b551a063 DG |
2307 | } |
2308 | ||
bec39940 | 2309 | uchan = caa_container_of(&node->node, struct ltt_ust_channel, node.node); |
d7b75b30 | 2310 | |
bec39940 | 2311 | nb_event += lttng_ht_get_count(uchan->events); |
d7b75b30 | 2312 | |
b551a063 DG |
2313 | if (nb_event == 0) { |
2314 | ret = nb_event; | |
2315 | goto error; | |
2316 | } | |
2317 | ||
2318 | DBG3("Listing UST global %d events", nb_event); | |
2319 | ||
2320 | tmp = zmalloc(nb_event * sizeof(struct lttng_event)); | |
2321 | if (tmp == NULL) { | |
2322 | ret = -LTTCOMM_FATAL; | |
2323 | goto error; | |
2324 | } | |
2325 | ||
bec39940 | 2326 | cds_lfht_for_each_entry(uchan->events->ht, &iter.iter, uevent, node.node) { |
d7b75b30 DG |
2327 | strncpy(tmp[i].name, uevent->attr.name, LTTNG_SYMBOL_NAME_LEN); |
2328 | tmp[i].name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0'; | |
2329 | tmp[i].enabled = uevent->enabled; | |
2330 | switch (uevent->attr.instrumentation) { | |
2331 | case LTTNG_UST_TRACEPOINT: | |
2332 | tmp[i].type = LTTNG_EVENT_TRACEPOINT; | |
2333 | break; | |
2334 | case LTTNG_UST_PROBE: | |
2335 | tmp[i].type = LTTNG_EVENT_PROBE; | |
2336 | break; | |
2337 | case LTTNG_UST_FUNCTION: | |
2338 | tmp[i].type = LTTNG_EVENT_FUNCTION; | |
2339 | break; | |
0cda4f28 | 2340 | } |
8005f29a | 2341 | tmp[i].loglevel = uevent->attr.loglevel; |
0cda4f28 | 2342 | switch (uevent->attr.loglevel_type) { |
8005f29a | 2343 | case LTTNG_UST_LOGLEVEL_ALL: |
22e25b71 | 2344 | tmp[i].loglevel_type = LTTNG_EVENT_LOGLEVEL_ALL; |
0cda4f28 | 2345 | break; |
8005f29a | 2346 | case LTTNG_UST_LOGLEVEL_RANGE: |
22e25b71 | 2347 | tmp[i].loglevel_type = LTTNG_EVENT_LOGLEVEL_RANGE; |
8005f29a MD |
2348 | break; |
2349 | case LTTNG_UST_LOGLEVEL_SINGLE: | |
22e25b71 | 2350 | tmp[i].loglevel_type = LTTNG_EVENT_LOGLEVEL_SINGLE; |
ac3bd9c0 | 2351 | break; |
9f19cc17 | 2352 | } |
d7b75b30 | 2353 | i++; |
9f19cc17 DG |
2354 | } |
2355 | ||
b551a063 DG |
2356 | ret = nb_event; |
2357 | *events = tmp; | |
2358 | ||
2359 | error: | |
2360 | rcu_read_unlock(); | |
2361 | return ret; | |
9f19cc17 DG |
2362 | } |
2363 | ||
2364 | /* | |
b551a063 | 2365 | * Fill lttng_event array of all kernel events in the channel. |
9f19cc17 | 2366 | */ |
b551a063 DG |
2367 | static int list_lttng_kernel_events(char *channel_name, |
2368 | struct ltt_kernel_session *kernel_session, struct lttng_event **events) | |
9f19cc17 | 2369 | { |
b551a063 DG |
2370 | int i = 0, ret; |
2371 | unsigned int nb_event; | |
9f19cc17 | 2372 | struct ltt_kernel_event *event; |
b551a063 DG |
2373 | struct ltt_kernel_channel *kchan; |
2374 | ||
2375 | kchan = trace_kernel_get_channel_by_name(channel_name, kernel_session); | |
2376 | if (kchan == NULL) { | |
2377 | ret = LTTCOMM_KERN_CHAN_NOT_FOUND; | |
2378 | goto error; | |
2379 | } | |
2380 | ||
2381 | nb_event = kchan->event_count; | |
9f19cc17 DG |
2382 | |
2383 | DBG("Listing events for channel %s", kchan->channel->name); | |
2384 | ||
b551a063 DG |
2385 | if (nb_event == 0) { |
2386 | ret = nb_event; | |
2387 | goto error; | |
2388 | } | |
2389 | ||
2390 | *events = zmalloc(nb_event * sizeof(struct lttng_event)); | |
2391 | if (*events == NULL) { | |
2392 | ret = LTTCOMM_FATAL; | |
2393 | goto error; | |
2394 | } | |
2395 | ||
9f19cc17 DG |
2396 | /* Kernel channels */ |
2397 | cds_list_for_each_entry(event, &kchan->events_list.head , list) { | |
b551a063 DG |
2398 | strncpy((*events)[i].name, event->event->name, LTTNG_SYMBOL_NAME_LEN); |
2399 | (*events)[i].name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0'; | |
2400 | (*events)[i].enabled = event->enabled; | |
9f19cc17 DG |
2401 | switch (event->event->instrumentation) { |
2402 | case LTTNG_KERNEL_TRACEPOINT: | |
b551a063 | 2403 | (*events)[i].type = LTTNG_EVENT_TRACEPOINT; |
9f19cc17 DG |
2404 | break; |
2405 | case LTTNG_KERNEL_KPROBE: | |
2406 | case LTTNG_KERNEL_KRETPROBE: | |
b551a063 DG |
2407 | (*events)[i].type = LTTNG_EVENT_PROBE; |
2408 | memcpy(&(*events)[i].attr.probe, &event->event->u.kprobe, | |
9f19cc17 DG |
2409 | sizeof(struct lttng_kernel_kprobe)); |
2410 | break; | |
2411 | case LTTNG_KERNEL_FUNCTION: | |
b551a063 DG |
2412 | (*events)[i].type = LTTNG_EVENT_FUNCTION; |
2413 | memcpy(&((*events)[i].attr.ftrace), &event->event->u.ftrace, | |
9f19cc17 DG |
2414 | sizeof(struct lttng_kernel_function)); |
2415 | break; | |
0133c199 | 2416 | case LTTNG_KERNEL_NOOP: |
b551a063 | 2417 | (*events)[i].type = LTTNG_EVENT_NOOP; |
0133c199 | 2418 | break; |
a54bd42d | 2419 | case LTTNG_KERNEL_SYSCALL: |
b551a063 | 2420 | (*events)[i].type = LTTNG_EVENT_SYSCALL; |
0133c199 | 2421 | break; |
7a3d1328 MD |
2422 | case LTTNG_KERNEL_ALL: |
2423 | assert(0); | |
2424 | break; | |
9f19cc17 DG |
2425 | } |
2426 | i++; | |
2427 | } | |
b551a063 DG |
2428 | |
2429 | return nb_event; | |
2430 | ||
2431 | error: | |
2432 | return ret; | |
9f19cc17 DG |
2433 | } |
2434 | ||
fac6795d | 2435 | /* |
54d01ffb | 2436 | * Command LTTNG_DISABLE_CHANNEL processed by the client thread. |
fac6795d | 2437 | */ |
54d01ffb DG |
2438 | static int cmd_disable_channel(struct ltt_session *session, |
2439 | int domain, char *channel_name) | |
fac6795d | 2440 | { |
54d01ffb | 2441 | int ret; |
78f0bacd DG |
2442 | struct ltt_ust_session *usess; |
2443 | ||
2444 | usess = session->ust_session; | |
379473d2 | 2445 | |
54d01ffb | 2446 | switch (domain) { |
78f0bacd DG |
2447 | case LTTNG_DOMAIN_KERNEL: |
2448 | { | |
2449 | ret = channel_kernel_disable(session->kernel_session, | |
2450 | channel_name); | |
2451 | if (ret != LTTCOMM_OK) { | |
2452 | goto error; | |
2453 | } | |
54d01ffb | 2454 | |
78f0bacd DG |
2455 | kernel_wait_quiescent(kernel_tracer_fd); |
2456 | break; | |
2457 | } | |
2458 | case LTTNG_DOMAIN_UST: | |
2459 | { | |
2460 | struct ltt_ust_channel *uchan; | |
bec39940 | 2461 | struct lttng_ht *chan_ht; |
78f0bacd | 2462 | |
7885e399 DG |
2463 | chan_ht = usess->domain_global.channels; |
2464 | ||
2465 | uchan = trace_ust_find_channel_by_name(chan_ht, channel_name); | |
78f0bacd DG |
2466 | if (uchan == NULL) { |
2467 | ret = LTTCOMM_UST_CHAN_NOT_FOUND; | |
54d01ffb | 2468 | goto error; |
78f0bacd DG |
2469 | } |
2470 | ||
7885e399 DG |
2471 | ret = channel_ust_disable(usess, domain, uchan); |
2472 | if (ret != LTTCOMM_OK) { | |
78f0bacd DG |
2473 | goto error; |
2474 | } | |
78f0bacd DG |
2475 | break; |
2476 | } | |
d78d6610 | 2477 | #if 0 |
78f0bacd DG |
2478 | case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN: |
2479 | case LTTNG_DOMAIN_UST_EXEC_NAME: | |
2480 | case LTTNG_DOMAIN_UST_PID: | |
d78d6610 | 2481 | #endif |
78f0bacd DG |
2482 | default: |
2483 | ret = LTTCOMM_UNKNOWN_DOMAIN; | |
2484 | goto error; | |
20fe2104 DG |
2485 | } |
2486 | ||
54d01ffb | 2487 | ret = LTTCOMM_OK; |
d65106b1 | 2488 | |
54d01ffb DG |
2489 | error: |
2490 | return ret; | |
2491 | } | |
2492 | ||
2493 | /* | |
2494 | * Command LTTNG_ENABLE_CHANNEL processed by the client thread. | |
2495 | */ | |
44d3bd01 | 2496 | static int cmd_enable_channel(struct ltt_session *session, |
aea829b3 | 2497 | int domain, struct lttng_channel *attr) |
54d01ffb DG |
2498 | { |
2499 | int ret; | |
f6a9efaa | 2500 | struct ltt_ust_session *usess = session->ust_session; |
bec39940 | 2501 | struct lttng_ht *chan_ht; |
f6a9efaa | 2502 | |
5d56b5aa | 2503 | DBG("Enabling channel %s for session %s", attr->name, session->name); |
d65106b1 | 2504 | |
aea829b3 | 2505 | switch (domain) { |
44d3bd01 DG |
2506 | case LTTNG_DOMAIN_KERNEL: |
2507 | { | |
2508 | struct ltt_kernel_channel *kchan; | |
54d01ffb | 2509 | |
44d3bd01 DG |
2510 | kchan = trace_kernel_get_channel_by_name(attr->name, |
2511 | session->kernel_session); | |
2512 | if (kchan == NULL) { | |
2513 | ret = channel_kernel_create(session->kernel_session, | |
2514 | attr, kernel_poll_pipe[1]); | |
2515 | } else { | |
2516 | ret = channel_kernel_enable(session->kernel_session, kchan); | |
2517 | } | |
2518 | ||
2519 | if (ret != LTTCOMM_OK) { | |
2520 | goto error; | |
2521 | } | |
2522 | ||
2523 | kernel_wait_quiescent(kernel_tracer_fd); | |
2524 | break; | |
2525 | } | |
f6a9efaa DG |
2526 | case LTTNG_DOMAIN_UST: |
2527 | { | |
2528 | struct ltt_ust_channel *uchan; | |
2529 | ||
7885e399 | 2530 | chan_ht = usess->domain_global.channels; |
f6a9efaa | 2531 | |
7885e399 | 2532 | uchan = trace_ust_find_channel_by_name(chan_ht, attr->name); |
f6a9efaa | 2533 | if (uchan == NULL) { |
7885e399 | 2534 | ret = channel_ust_create(usess, domain, attr); |
f6a9efaa | 2535 | } else { |
7885e399 | 2536 | ret = channel_ust_enable(usess, domain, uchan); |
48842b30 | 2537 | } |
f6a9efaa DG |
2538 | break; |
2539 | } | |
d78d6610 | 2540 | #if 0 |
78f0bacd DG |
2541 | case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN: |
2542 | case LTTNG_DOMAIN_UST_EXEC_NAME: | |
44d3bd01 | 2543 | case LTTNG_DOMAIN_UST_PID: |
d78d6610 | 2544 | #endif |
44d3bd01 DG |
2545 | default: |
2546 | ret = LTTCOMM_UNKNOWN_DOMAIN; | |
2547 | goto error; | |
54d01ffb DG |
2548 | } |
2549 | ||
54d01ffb DG |
2550 | error: |
2551 | return ret; | |
2552 | } | |
2553 | ||
2554 | /* | |
2555 | * Command LTTNG_DISABLE_EVENT processed by the client thread. | |
2556 | */ | |
2557 | static int cmd_disable_event(struct ltt_session *session, int domain, | |
2558 | char *channel_name, char *event_name) | |
2559 | { | |
2560 | int ret; | |
54d01ffb DG |
2561 | |
2562 | switch (domain) { | |
2563 | case LTTNG_DOMAIN_KERNEL: | |
2bdd86d4 MD |
2564 | { |
2565 | struct ltt_kernel_channel *kchan; | |
b0a40d28 | 2566 | struct ltt_kernel_session *ksess; |
2bdd86d4 | 2567 | |
b0a40d28 DG |
2568 | ksess = session->kernel_session; |
2569 | ||
2570 | kchan = trace_kernel_get_channel_by_name(channel_name, ksess); | |
54d01ffb DG |
2571 | if (kchan == NULL) { |
2572 | ret = LTTCOMM_KERN_CHAN_NOT_FOUND; | |
2573 | goto error; | |
d65106b1 DG |
2574 | } |
2575 | ||
b0a40d28 | 2576 | ret = event_kernel_disable_tracepoint(ksess, kchan, event_name); |
54d01ffb DG |
2577 | if (ret != LTTCOMM_OK) { |
2578 | goto error; | |
2579 | } | |
2580 | ||
2581 | kernel_wait_quiescent(kernel_tracer_fd); | |
d65106b1 | 2582 | break; |
2bdd86d4 MD |
2583 | } |
2584 | case LTTNG_DOMAIN_UST: | |
b0a40d28 | 2585 | { |
b0a40d28 | 2586 | struct ltt_ust_channel *uchan; |
7f79d3a1 | 2587 | struct ltt_ust_session *usess; |
b0a40d28 DG |
2588 | |
2589 | usess = session->ust_session; | |
2590 | ||
2591 | uchan = trace_ust_find_channel_by_name(usess->domain_global.channels, | |
2592 | channel_name); | |
2593 | if (uchan == NULL) { | |
2594 | ret = LTTCOMM_UST_CHAN_NOT_FOUND; | |
2595 | goto error; | |
2596 | } | |
2597 | ||
7f79d3a1 DG |
2598 | ret = event_ust_disable_tracepoint(usess, domain, uchan, event_name); |
2599 | if (ret != LTTCOMM_OK) { | |
b0a40d28 DG |
2600 | goto error; |
2601 | } | |
2602 | ||
7f79d3a1 | 2603 | DBG3("Disable UST event %s in channel %s completed", event_name, |
b0a40d28 | 2604 | channel_name); |
b0a40d28 DG |
2605 | break; |
2606 | } | |
d78d6610 | 2607 | #if 0 |
2bdd86d4 MD |
2608 | case LTTNG_DOMAIN_UST_EXEC_NAME: |
2609 | case LTTNG_DOMAIN_UST_PID: | |
2610 | case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN: | |
d78d6610 | 2611 | #endif |
54d01ffb | 2612 | default: |
1ab1ea0b | 2613 | ret = LTTCOMM_UND; |
54d01ffb | 2614 | goto error; |
d65106b1 | 2615 | } |
26cc6b4e | 2616 | |
54d01ffb DG |
2617 | ret = LTTCOMM_OK; |
2618 | ||
2619 | error: | |
2620 | return ret; | |
2621 | } | |
2622 | ||
2623 | /* | |
2624 | * Command LTTNG_DISABLE_ALL_EVENT processed by the client thread. | |
2625 | */ | |
2626 | static int cmd_disable_event_all(struct ltt_session *session, int domain, | |
2627 | char *channel_name) | |
2628 | { | |
2629 | int ret; | |
54d01ffb DG |
2630 | |
2631 | switch (domain) { | |
2632 | case LTTNG_DOMAIN_KERNEL: | |
9730260e DG |
2633 | { |
2634 | struct ltt_kernel_session *ksess; | |
2635 | struct ltt_kernel_channel *kchan; | |
2636 | ||
2637 | ksess = session->kernel_session; | |
2638 | ||
2639 | kchan = trace_kernel_get_channel_by_name(channel_name, ksess); | |
54d01ffb DG |
2640 | if (kchan == NULL) { |
2641 | ret = LTTCOMM_KERN_CHAN_NOT_FOUND; | |
2642 | goto error; | |
26cc6b4e DG |
2643 | } |
2644 | ||
9730260e | 2645 | ret = event_kernel_disable_all(ksess, kchan); |
54d01ffb | 2646 | if (ret != LTTCOMM_OK) { |
0b97ec54 | 2647 | goto error; |
26cc6b4e DG |
2648 | } |
2649 | ||
54d01ffb | 2650 | kernel_wait_quiescent(kernel_tracer_fd); |
26cc6b4e | 2651 | break; |
9730260e DG |
2652 | } |
2653 | case LTTNG_DOMAIN_UST: | |
2654 | { | |
2655 | struct ltt_ust_session *usess; | |
2656 | struct ltt_ust_channel *uchan; | |
2657 | ||
2658 | usess = session->ust_session; | |
2659 | ||
2660 | uchan = trace_ust_find_channel_by_name(usess->domain_global.channels, | |
2661 | channel_name); | |
2662 | if (uchan == NULL) { | |
2663 | ret = LTTCOMM_UST_CHAN_NOT_FOUND; | |
2664 | goto error; | |
2665 | } | |
2666 | ||
7f79d3a1 DG |
2667 | ret = event_ust_disable_all_tracepoints(usess, domain, uchan); |
2668 | if (ret != 0) { | |
9730260e DG |
2669 | goto error; |
2670 | } | |
2671 | ||
7f79d3a1 | 2672 | DBG3("Disable all UST events in channel %s completed", channel_name); |
9730260e DG |
2673 | |
2674 | break; | |
2675 | } | |
d78d6610 | 2676 | #if 0 |
9730260e DG |
2677 | case LTTNG_DOMAIN_UST_EXEC_NAME: |
2678 | case LTTNG_DOMAIN_UST_PID: | |
2679 | case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN: | |
d78d6610 | 2680 | #endif |
54d01ffb | 2681 | default: |
1ab1ea0b | 2682 | ret = LTTCOMM_UND; |
54d01ffb | 2683 | goto error; |
26cc6b4e | 2684 | } |
e953ef25 | 2685 | |
54d01ffb | 2686 | ret = LTTCOMM_OK; |
e953ef25 | 2687 | |
54d01ffb DG |
2688 | error: |
2689 | return ret; | |
2690 | } | |
f5177a38 | 2691 | |
54d01ffb DG |
2692 | /* |
2693 | * Command LTTNG_ADD_CONTEXT processed by the client thread. | |
2694 | */ | |
2695 | static int cmd_add_context(struct ltt_session *session, int domain, | |
2696 | char *channel_name, char *event_name, struct lttng_event_context *ctx) | |
2697 | { | |
2698 | int ret; | |
f5177a38 | 2699 | |
54d01ffb DG |
2700 | switch (domain) { |
2701 | case LTTNG_DOMAIN_KERNEL: | |
2702 | /* Add kernel context to kernel tracer */ | |
2703 | ret = context_kernel_add(session->kernel_session, ctx, | |
2704 | event_name, channel_name); | |
2705 | if (ret != LTTCOMM_OK) { | |
f5177a38 | 2706 | goto error; |
e953ef25 | 2707 | } |
2bdd86d4 MD |
2708 | break; |
2709 | case LTTNG_DOMAIN_UST: | |
2710 | { | |
55cc08a6 | 2711 | struct ltt_ust_session *usess = session->ust_session; |
e953ef25 | 2712 | |
55cc08a6 DG |
2713 | ret = context_ust_add(usess, domain, ctx, event_name, channel_name); |
2714 | if (ret != LTTCOMM_OK) { | |
2715 | goto error; | |
2bdd86d4 | 2716 | } |
e953ef25 | 2717 | break; |
2bdd86d4 | 2718 | } |
d78d6610 | 2719 | #if 0 |
55cc08a6 DG |
2720 | case LTTNG_DOMAIN_UST_EXEC_NAME: |
2721 | case LTTNG_DOMAIN_UST_PID: | |
2722 | case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN: | |
d78d6610 | 2723 | #endif |
54d01ffb | 2724 | default: |
1ab1ea0b | 2725 | ret = LTTCOMM_UND; |
54d01ffb | 2726 | goto error; |
e953ef25 | 2727 | } |
950131af | 2728 | |
54d01ffb | 2729 | ret = LTTCOMM_OK; |
950131af | 2730 | |
54d01ffb DG |
2731 | error: |
2732 | return ret; | |
2733 | } | |
2734 | ||
53a80697 MD |
2735 | /* |
2736 | * Command LTTNG_SET_FILTER processed by the client thread. | |
2737 | */ | |
2738 | static int cmd_set_filter(struct ltt_session *session, int domain, | |
2739 | char *channel_name, char *event_name, | |
2740 | struct lttng_filter_bytecode *bytecode) | |
2741 | { | |
2742 | int ret; | |
2743 | ||
2744 | switch (domain) { | |
2745 | case LTTNG_DOMAIN_KERNEL: | |
2746 | ret = LTTCOMM_FATAL; | |
2747 | break; | |
2748 | case LTTNG_DOMAIN_UST: | |
2749 | { | |
2750 | struct ltt_ust_session *usess = session->ust_session; | |
2751 | ||
2752 | ret = filter_ust_set(usess, domain, bytecode, event_name, channel_name); | |
2753 | if (ret != LTTCOMM_OK) { | |
2754 | goto error; | |
2755 | } | |
2756 | break; | |
2757 | } | |
2758 | #if 0 | |
2759 | case LTTNG_DOMAIN_UST_EXEC_NAME: | |
2760 | case LTTNG_DOMAIN_UST_PID: | |
2761 | case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN: | |
2762 | #endif | |
2763 | default: | |
2764 | ret = LTTCOMM_UND; | |
2765 | goto error; | |
2766 | } | |
2767 | ||
2768 | ret = LTTCOMM_OK; | |
2769 | ||
2770 | error: | |
2771 | return ret; | |
2772 | ||
2773 | } | |
2774 | ||
54d01ffb DG |
2775 | /* |
2776 | * Command LTTNG_ENABLE_EVENT processed by the client thread. | |
2777 | */ | |
2778 | static int cmd_enable_event(struct ltt_session *session, int domain, | |
2779 | char *channel_name, struct lttng_event *event) | |
2780 | { | |
2781 | int ret; | |
f6cd6b0f | 2782 | struct lttng_channel *attr; |
48842b30 | 2783 | struct ltt_ust_session *usess = session->ust_session; |
54d01ffb DG |
2784 | |
2785 | switch (domain) { | |
2786 | case LTTNG_DOMAIN_KERNEL: | |
2bdd86d4 MD |
2787 | { |
2788 | struct ltt_kernel_channel *kchan; | |
2789 | ||
54d01ffb DG |
2790 | kchan = trace_kernel_get_channel_by_name(channel_name, |
2791 | session->kernel_session); | |
2792 | if (kchan == NULL) { | |
f6cd6b0f DG |
2793 | attr = channel_new_default_attr(domain); |
2794 | if (attr == NULL) { | |
2795 | ret = LTTCOMM_FATAL; | |
2796 | goto error; | |
2797 | } | |
2798 | snprintf(attr->name, NAME_MAX, "%s", channel_name); | |
2799 | ||
54d01ffb | 2800 | /* This call will notify the kernel thread */ |
44d3bd01 | 2801 | ret = channel_kernel_create(session->kernel_session, |
f6cd6b0f | 2802 | attr, kernel_poll_pipe[1]); |
54d01ffb | 2803 | if (ret != LTTCOMM_OK) { |
ff4d74e6 | 2804 | free(attr); |
f5177a38 DG |
2805 | goto error; |
2806 | } | |
ff4d74e6 | 2807 | free(attr); |
54d01ffb | 2808 | } |
950131af | 2809 | |
54d01ffb DG |
2810 | /* Get the newly created kernel channel pointer */ |
2811 | kchan = trace_kernel_get_channel_by_name(channel_name, | |
2812 | session->kernel_session); | |
2813 | if (kchan == NULL) { | |
2814 | /* This sould not happen... */ | |
2815 | ret = LTTCOMM_FATAL; | |
2816 | goto error; | |
2817 | } | |
f5177a38 | 2818 | |
48842b30 DG |
2819 | ret = event_kernel_enable_tracepoint(session->kernel_session, kchan, |
2820 | event); | |
54d01ffb | 2821 | if (ret != LTTCOMM_OK) { |
f5177a38 | 2822 | goto error; |
950131af DG |
2823 | } |
2824 | ||
54d01ffb | 2825 | kernel_wait_quiescent(kernel_tracer_fd); |
950131af | 2826 | break; |
2bdd86d4 MD |
2827 | } |
2828 | case LTTNG_DOMAIN_UST: | |
2829 | { | |
aea829b3 | 2830 | struct lttng_channel *attr; |
edb67388 | 2831 | struct ltt_ust_channel *uchan; |
2bdd86d4 | 2832 | |
edb67388 | 2833 | /* Get channel from global UST domain */ |
48842b30 DG |
2834 | uchan = trace_ust_find_channel_by_name(usess->domain_global.channels, |
2835 | channel_name); | |
2836 | if (uchan == NULL) { | |
aea829b3 DG |
2837 | /* Create default channel */ |
2838 | attr = channel_new_default_attr(domain); | |
2839 | if (attr == NULL) { | |
2840 | ret = LTTCOMM_FATAL; | |
2841 | goto error; | |
2842 | } | |
596219f7 | 2843 | snprintf(attr->name, NAME_MAX, "%s", channel_name); |
edb67388 | 2844 | attr->name[NAME_MAX - 1] = '\0'; |
aea829b3 | 2845 | |
7885e399 | 2846 | ret = channel_ust_create(usess, domain, attr); |
edb67388 | 2847 | if (ret != LTTCOMM_OK) { |
ff4d74e6 | 2848 | free(attr); |
aea829b3 DG |
2849 | goto error; |
2850 | } | |
aea829b3 DG |
2851 | free(attr); |
2852 | ||
2853 | /* Get the newly created channel reference back */ | |
2854 | uchan = trace_ust_find_channel_by_name( | |
2855 | usess->domain_global.channels, channel_name); | |
2856 | if (uchan == NULL) { | |
2857 | /* Something is really wrong */ | |
2858 | ret = LTTCOMM_FATAL; | |
2859 | goto error; | |
2860 | } | |
48842b30 | 2861 | } |
2bdd86d4 | 2862 | |
edb67388 | 2863 | /* At this point, the session and channel exist on the tracer */ |
edb67388 DG |
2864 | ret = event_ust_enable_tracepoint(usess, domain, uchan, event); |
2865 | if (ret != LTTCOMM_OK) { | |
48842b30 | 2866 | goto error; |
2bdd86d4 MD |
2867 | } |
2868 | break; | |
2869 | } | |
d78d6610 | 2870 | #if 0 |
2bdd86d4 MD |
2871 | case LTTNG_DOMAIN_UST_EXEC_NAME: |
2872 | case LTTNG_DOMAIN_UST_PID: | |
2873 | case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN: | |
d78d6610 | 2874 | #endif |
54d01ffb | 2875 | default: |
1ab1ea0b | 2876 | ret = LTTCOMM_UND; |
54d01ffb | 2877 | goto error; |
950131af | 2878 | } |
d36b8583 | 2879 | |
54d01ffb | 2880 | ret = LTTCOMM_OK; |
d36b8583 | 2881 | |
54d01ffb DG |
2882 | error: |
2883 | return ret; | |
2884 | } | |
7d29a247 | 2885 | |
54d01ffb DG |
2886 | /* |
2887 | * Command LTTNG_ENABLE_ALL_EVENT processed by the client thread. | |
2888 | */ | |
2889 | static int cmd_enable_event_all(struct ltt_session *session, int domain, | |
8c9ae521 | 2890 | char *channel_name, int event_type) |
54d01ffb DG |
2891 | { |
2892 | int ret; | |
2893 | struct ltt_kernel_channel *kchan; | |
7d29a247 | 2894 | |
54d01ffb DG |
2895 | switch (domain) { |
2896 | case LTTNG_DOMAIN_KERNEL: | |
2897 | kchan = trace_kernel_get_channel_by_name(channel_name, | |
2898 | session->kernel_session); | |
2899 | if (kchan == NULL) { | |
2900 | /* This call will notify the kernel thread */ | |
44d3bd01 DG |
2901 | ret = channel_kernel_create(session->kernel_session, NULL, |
2902 | kernel_poll_pipe[1]); | |
54d01ffb DG |
2903 | if (ret != LTTCOMM_OK) { |
2904 | goto error; | |
d36b8583 | 2905 | } |
0d0c377a | 2906 | |
8f69e5eb DG |
2907 | /* Get the newly created kernel channel pointer */ |
2908 | kchan = trace_kernel_get_channel_by_name(channel_name, | |
2909 | session->kernel_session); | |
2910 | if (kchan == NULL) { | |
2911 | /* This sould not happen... */ | |
2912 | ret = LTTCOMM_FATAL; | |
2913 | goto error; | |
2914 | } | |
2915 | ||
54d01ffb | 2916 | } |
0fdd1e2c | 2917 | |
7a3d1328 | 2918 | switch (event_type) { |
76d45b40 | 2919 | case LTTNG_EVENT_SYSCALL: |
7a3d1328 | 2920 | ret = event_kernel_enable_all_syscalls(session->kernel_session, |
8c9ae521 | 2921 | kchan, kernel_tracer_fd); |
7a3d1328 | 2922 | break; |
76d45b40 | 2923 | case LTTNG_EVENT_TRACEPOINT: |
8c9ae521 | 2924 | /* |
7a3d1328 MD |
2925 | * This call enables all LTTNG_KERNEL_TRACEPOINTS and |
2926 | * events already registered to the channel. | |
8c9ae521 | 2927 | */ |
7a3d1328 MD |
2928 | ret = event_kernel_enable_all_tracepoints(session->kernel_session, |
2929 | kchan, kernel_tracer_fd); | |
2930 | break; | |
76d45b40 | 2931 | case LTTNG_EVENT_ALL: |
7a3d1328 | 2932 | /* Enable syscalls and tracepoints */ |
8c9ae521 DG |
2933 | ret = event_kernel_enable_all(session->kernel_session, |
2934 | kchan, kernel_tracer_fd); | |
7a3d1328 MD |
2935 | break; |
2936 | default: | |
2937 | ret = LTTCOMM_KERN_ENABLE_FAIL; | |
2938 | goto error; | |
8c9ae521 | 2939 | } |
8f69e5eb DG |
2940 | |
2941 | /* Manage return value */ | |
54d01ffb | 2942 | if (ret != LTTCOMM_OK) { |
0d0c377a | 2943 | goto error; |
d36b8583 DG |
2944 | } |
2945 | ||
54d01ffb | 2946 | kernel_wait_quiescent(kernel_tracer_fd); |
d36b8583 | 2947 | break; |
76d45b40 DG |
2948 | case LTTNG_DOMAIN_UST: |
2949 | { | |
2950 | struct lttng_channel *attr; | |
2951 | struct ltt_ust_channel *uchan; | |
2952 | struct ltt_ust_session *usess = session->ust_session; | |
2953 | ||
2954 | /* Get channel from global UST domain */ | |
2955 | uchan = trace_ust_find_channel_by_name(usess->domain_global.channels, | |
2956 | channel_name); | |
2957 | if (uchan == NULL) { | |
2958 | /* Create default channel */ | |
2959 | attr = channel_new_default_attr(domain); | |
2960 | if (attr == NULL) { | |
2961 | ret = LTTCOMM_FATAL; | |
2962 | goto error; | |
2963 | } | |
2964 | snprintf(attr->name, NAME_MAX, "%s", channel_name); | |
2965 | attr->name[NAME_MAX - 1] = '\0'; | |
2966 | ||
2967 | /* Use the internal command enable channel */ | |
7885e399 | 2968 | ret = channel_ust_create(usess, domain, attr); |
76d45b40 DG |
2969 | if (ret != LTTCOMM_OK) { |
2970 | free(attr); | |
2971 | goto error; | |
2972 | } | |
2973 | free(attr); | |
2974 | ||
2975 | /* Get the newly created channel reference back */ | |
2976 | uchan = trace_ust_find_channel_by_name( | |
2977 | usess->domain_global.channels, channel_name); | |
2978 | if (uchan == NULL) { | |
2979 | /* Something is really wrong */ | |
2980 | ret = LTTCOMM_FATAL; | |
2981 | goto error; | |
2982 | } | |
2983 | } | |
2984 | ||
2985 | /* At this point, the session and channel exist on the tracer */ | |
2986 | ||
2987 | switch (event_type) { | |
2988 | case LTTNG_EVENT_ALL: | |
2989 | case LTTNG_EVENT_TRACEPOINT: | |
2990 | ret = event_ust_enable_all_tracepoints(usess, domain, uchan); | |
2991 | if (ret != LTTCOMM_OK) { | |
2992 | goto error; | |
2993 | } | |
2994 | break; | |
2995 | default: | |
2996 | ret = LTTCOMM_UST_ENABLE_FAIL; | |
2997 | goto error; | |
2998 | } | |
2999 | ||
3000 | /* Manage return value */ | |
3001 | if (ret != LTTCOMM_OK) { | |
3002 | goto error; | |
3003 | } | |
3004 | ||
3005 | break; | |
3006 | } | |
d78d6610 | 3007 | #if 0 |
76d45b40 DG |
3008 | case LTTNG_DOMAIN_UST_EXEC_NAME: |
3009 | case LTTNG_DOMAIN_UST_PID: | |
3010 | case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN: | |
d78d6610 | 3011 | #endif |
54d01ffb | 3012 | default: |
1ab1ea0b | 3013 | ret = LTTCOMM_UND; |
54d01ffb | 3014 | goto error; |
d36b8583 | 3015 | } |
f3ed775e | 3016 | |
54d01ffb DG |
3017 | ret = LTTCOMM_OK; |
3018 | ||
3019 | error: | |
3020 | return ret; | |
3021 | } | |
3022 | ||
3023 | /* | |
3024 | * Command LTTNG_LIST_TRACEPOINTS processed by the client thread. | |
3025 | */ | |
3026 | static ssize_t cmd_list_tracepoints(int domain, struct lttng_event **events) | |
3027 | { | |
3028 | int ret; | |
3029 | ssize_t nb_events = 0; | |
3030 | ||
3031 | switch (domain) { | |
3032 | case LTTNG_DOMAIN_KERNEL: | |
3033 | nb_events = kernel_list_events(kernel_tracer_fd, events); | |
3034 | if (nb_events < 0) { | |
3035 | ret = LTTCOMM_KERN_LIST_FAIL; | |
3036 | goto error; | |
894be886 | 3037 | } |
54d01ffb | 3038 | break; |
b551a063 DG |
3039 | case LTTNG_DOMAIN_UST: |
3040 | nb_events = ust_app_list_events(events); | |
3041 | if (nb_events < 0) { | |
3042 | ret = LTTCOMM_UST_LIST_FAIL; | |
3043 | goto error; | |
3044 | } | |
3045 | break; | |
54d01ffb | 3046 | default: |
1ab1ea0b | 3047 | ret = LTTCOMM_UND; |
54d01ffb DG |
3048 | goto error; |
3049 | } | |
894be886 | 3050 | |
54d01ffb | 3051 | return nb_events; |
7d29a247 | 3052 | |
54d01ffb DG |
3053 | error: |
3054 | /* Return negative value to differentiate return code */ | |
3055 | return -ret; | |
3056 | } | |
b389abbe | 3057 | |
f37d259d MD |
3058 | /* |
3059 | * Command LTTNG_LIST_TRACEPOINT_FIELDS processed by the client thread. | |
3060 | */ | |
3061 | static ssize_t cmd_list_tracepoint_fields(int domain, | |
3062 | struct lttng_event_field **fields) | |
3063 | { | |
3064 | int ret; | |
3065 | ssize_t nb_fields = 0; | |
3066 | ||
3067 | switch (domain) { | |
3068 | case LTTNG_DOMAIN_UST: | |
3069 | nb_fields = ust_app_list_event_fields(fields); | |
3070 | if (nb_fields < 0) { | |
3071 | ret = LTTCOMM_UST_LIST_FAIL; | |
3072 | goto error; | |
3073 | } | |
3074 | break; | |
3075 | case LTTNG_DOMAIN_KERNEL: | |
3076 | default: /* fall-through */ | |
3077 | ret = LTTCOMM_UND; | |
3078 | goto error; | |
3079 | } | |
3080 | ||
3081 | return nb_fields; | |
3082 | ||
3083 | error: | |
3084 | /* Return negative value to differentiate return code */ | |
3085 | return -ret; | |
3086 | } | |
3087 | ||
54d01ffb DG |
3088 | /* |
3089 | * Command LTTNG_START_TRACE processed by the client thread. | |
3090 | */ | |
3091 | static int cmd_start_trace(struct ltt_session *session) | |
3092 | { | |
3093 | int ret; | |
54d01ffb | 3094 | struct ltt_kernel_session *ksession; |
b9d9b220 | 3095 | struct ltt_ust_session *usess; |
00e2e675 | 3096 | struct ltt_kernel_channel *kchan; |
b389abbe | 3097 | |
00e2e675 | 3098 | /* Ease our life a bit ;) */ |
54d01ffb | 3099 | ksession = session->kernel_session; |
b9d9b220 | 3100 | usess = session->ust_session; |
5eb91c98 | 3101 | |
b9ef1c83 | 3102 | if (session->enabled) { |
80e327fa DG |
3103 | /* Already started. */ |
3104 | ret = LTTCOMM_TRACE_ALREADY_STARTED; | |
b9ef1c83 DG |
3105 | goto error; |
3106 | } | |
3107 | ||
464dd62d MD |
3108 | session->enabled = 1; |
3109 | ||
00e2e675 DG |
3110 | ret = setup_relayd(session); |
3111 | if (ret != LTTCOMM_OK) { | |
3112 | ERR("Error setting up relayd for session %s", session->name); | |
3113 | goto error; | |
3114 | } | |
3115 | ||
54d01ffb DG |
3116 | /* Kernel tracing */ |
3117 | if (ksession != NULL) { | |
3118 | /* Open kernel metadata */ | |
3119 | if (ksession->metadata == NULL) { | |
00e2e675 DG |
3120 | ret = kernel_open_metadata(ksession, |
3121 | ksession->consumer->dst.trace_path); | |
54d01ffb DG |
3122 | if (ret < 0) { |
3123 | ret = LTTCOMM_KERN_META_FAIL; | |
3124 | goto error; | |
b389abbe | 3125 | } |
54d01ffb | 3126 | } |
7d29a247 | 3127 | |
54d01ffb | 3128 | /* Open kernel metadata stream */ |
03550b58 | 3129 | if (ksession->metadata_stream_fd < 0) { |
54d01ffb DG |
3130 | ret = kernel_open_metadata_stream(ksession); |
3131 | if (ret < 0) { | |
3132 | ERR("Kernel create metadata stream failed"); | |
3133 | ret = LTTCOMM_KERN_STREAM_FAIL; | |
3134 | goto error; | |
3135 | } | |
3136 | } | |
3137 | ||
3138 | /* For each channel */ | |
3139 | cds_list_for_each_entry(kchan, &ksession->channel_list.head, list) { | |
3140 | if (kchan->stream_count == 0) { | |
3141 | ret = kernel_open_channel_stream(kchan); | |
3142 | if (ret < 0) { | |
3143 | ret = LTTCOMM_KERN_STREAM_FAIL; | |
7d29a247 DG |
3144 | goto error; |
3145 | } | |
54d01ffb DG |
3146 | /* Update the stream global counter */ |
3147 | ksession->stream_count_global += ret; | |
7d29a247 | 3148 | } |
54d01ffb DG |
3149 | } |
3150 | ||
3151 | /* Setup kernel consumer socket and send fds to it */ | |
3152 | ret = init_kernel_tracing(ksession); | |
3153 | if (ret < 0) { | |
3154 | ret = LTTCOMM_KERN_START_FAIL; | |
3155 | goto error; | |
3156 | } | |
3157 | ||
3158 | /* This start the kernel tracing */ | |
3159 | ret = kernel_start_session(ksession); | |
3160 | if (ret < 0) { | |
3161 | ret = LTTCOMM_KERN_START_FAIL; | |
3162 | goto error; | |
3163 | } | |
3164 | ||
3165 | /* Quiescent wait after starting trace */ | |
3166 | kernel_wait_quiescent(kernel_tracer_fd); | |
3167 | } | |
3168 | ||
36dc12cc | 3169 | /* Flag session that trace should start automatically */ |
b9d9b220 DG |
3170 | if (usess) { |
3171 | usess->start_trace = 1; | |
36dc12cc | 3172 | |
b9d9b220 DG |
3173 | ret = ust_app_start_trace_all(usess); |
3174 | if (ret < 0) { | |
3175 | ret = LTTCOMM_UST_START_FAIL; | |
3176 | goto error; | |
3177 | } | |
2bdd86d4 | 3178 | } |
54d01ffb DG |
3179 | |
3180 | ret = LTTCOMM_OK; | |
3181 | ||
3182 | error: | |
3183 | return ret; | |
3184 | } | |
3185 | ||
3186 | /* | |
3187 | * Command LTTNG_STOP_TRACE processed by the client thread. | |
3188 | */ | |
3189 | static int cmd_stop_trace(struct ltt_session *session) | |
3190 | { | |
3191 | int ret; | |
3192 | struct ltt_kernel_channel *kchan; | |
3193 | struct ltt_kernel_session *ksession; | |
8be98f9a | 3194 | struct ltt_ust_session *usess; |
54d01ffb DG |
3195 | |
3196 | /* Short cut */ | |
3197 | ksession = session->kernel_session; | |
8be98f9a | 3198 | usess = session->ust_session; |
54d01ffb | 3199 | |
b9ef1c83 | 3200 | if (!session->enabled) { |
80e327fa | 3201 | ret = LTTCOMM_TRACE_ALREADY_STOPPED; |
b9ef1c83 DG |
3202 | goto error; |
3203 | } | |
3204 | ||
464dd62d MD |
3205 | session->enabled = 0; |
3206 | ||
54d01ffb DG |
3207 | /* Kernel tracer */ |
3208 | if (ksession != NULL) { | |
3209 | DBG("Stop kernel tracing"); | |
3210 | ||
00e2e675 DG |
3211 | /* Flush metadata if exist */ |
3212 | if (ksession->metadata_stream_fd >= 0) { | |
3213 | ret = kernel_metadata_flush_buffer(ksession->metadata_stream_fd); | |
3214 | if (ret < 0) { | |
3215 | ERR("Kernel metadata flush failed"); | |
3216 | } | |
54d01ffb | 3217 | } |
f34daff7 | 3218 | |
00e2e675 | 3219 | /* Flush all buffers before stopping */ |
54d01ffb DG |
3220 | cds_list_for_each_entry(kchan, &ksession->channel_list.head, list) { |
3221 | ret = kernel_flush_buffer(kchan); | |
0d0c377a | 3222 | if (ret < 0) { |
54d01ffb | 3223 | ERR("Kernel flush buffer error"); |
7d29a247 | 3224 | } |
54d01ffb | 3225 | } |
19e70852 | 3226 | |
54d01ffb DG |
3227 | ret = kernel_stop_session(ksession); |
3228 | if (ret < 0) { | |
3229 | ret = LTTCOMM_KERN_STOP_FAIL; | |
19e70852 | 3230 | goto error; |
f3ed775e | 3231 | } |
54d01ffb DG |
3232 | |
3233 | kernel_wait_quiescent(kernel_tracer_fd); | |
894be886 | 3234 | } |
54d01ffb | 3235 | |
8be98f9a MD |
3236 | if (usess) { |
3237 | usess->start_trace = 0; | |
2bdd86d4 | 3238 | |
8be98f9a | 3239 | ret = ust_app_stop_trace_all(usess); |
2bdd86d4 | 3240 | if (ret < 0) { |
190df5ac | 3241 | ret = LTTCOMM_UST_STOP_FAIL; |
2bdd86d4 MD |
3242 | goto error; |
3243 | } | |
2bdd86d4 | 3244 | } |
54d01ffb DG |
3245 | |
3246 | ret = LTTCOMM_OK; | |
3247 | ||
3248 | error: | |
3249 | return ret; | |
3250 | } | |
3251 | ||
3252 | /* | |
00e2e675 | 3253 | * Command LTTNG_CREATE_SESSION_URI processed by the client thread. |
54d01ffb | 3254 | */ |
00e2e675 DG |
3255 | static int cmd_create_session_uri(char *name, struct lttng_uri *ctrl_uri, |
3256 | struct lttng_uri *data_uri, unsigned int enable_consumer, | |
3257 | lttng_sock_cred *creds) | |
54d01ffb DG |
3258 | { |
3259 | int ret; | |
00e2e675 DG |
3260 | char *path = NULL; |
3261 | struct ltt_session *session; | |
3262 | struct consumer_output *consumer; | |
3263 | ||
3264 | /* Verify if the session already exist */ | |
3265 | session = session_find_by_name(name); | |
3266 | if (session != NULL) { | |
3267 | ret = LTTCOMM_EXIST_SESS; | |
3268 | goto error; | |
3269 | } | |
3270 | ||
3271 | /* TODO: validate URIs */ | |
3272 | ||
3273 | /* Create default consumer output */ | |
3274 | consumer = consumer_create_output(CONSUMER_DST_LOCAL); | |
3275 | if (consumer == NULL) { | |
3276 | ret = LTTCOMM_FATAL; | |
3277 | goto error; | |
3278 | } | |
3279 | strncpy(consumer->subdir, ctrl_uri->subdir, sizeof(consumer->subdir)); | |
3280 | DBG2("Consumer subdir set to %s", consumer->subdir); | |
3281 | ||
3282 | switch (ctrl_uri->dtype) { | |
3283 | case LTTNG_DST_IPV4: | |
3284 | case LTTNG_DST_IPV6: | |
3285 | /* Set control URI into consumer output object */ | |
3286 | ret = consumer_set_network_uri(consumer, ctrl_uri); | |
3287 | if (ret < 0) { | |
3288 | ret = LTTCOMM_FATAL; | |
3289 | goto error; | |
3290 | } | |
3291 | ||
3292 | /* Set data URI into consumer output object */ | |
3293 | ret = consumer_set_network_uri(consumer, data_uri); | |
3294 | if (ret < 0) { | |
3295 | ret = LTTCOMM_FATAL; | |
3296 | goto error; | |
3297 | } | |
3298 | ||
3299 | /* Empty path since the session is network */ | |
3300 | path = ""; | |
3301 | break; | |
3302 | case LTTNG_DST_PATH: | |
3303 | /* Very volatile pointer. Only used for the create session. */ | |
3304 | path = ctrl_uri->dst.path; | |
3305 | strncpy(consumer->dst.trace_path, path, | |
3306 | sizeof(consumer->dst.trace_path)); | |
3307 | break; | |
3308 | } | |
3309 | ||
3310 | /* Set if the consumer is enabled or not */ | |
3311 | consumer->enabled = enable_consumer; | |
54d01ffb | 3312 | |
730389d9 DG |
3313 | ret = session_create(name, path, LTTNG_SOCK_GET_UID_CRED(creds), |
3314 | LTTNG_SOCK_GET_GID_CRED(creds)); | |
54d01ffb | 3315 | if (ret != LTTCOMM_OK) { |
00e2e675 | 3316 | goto consumer_error; |
54d01ffb DG |
3317 | } |
3318 | ||
00e2e675 DG |
3319 | /* Get the newly created session pointer back */ |
3320 | session = session_find_by_name(name); | |
3321 | assert(session); | |
3322 | ||
3323 | /* Assign consumer to session */ | |
3324 | session->consumer = consumer; | |
3325 | ||
3326 | return LTTCOMM_OK; | |
3327 | ||
3328 | consumer_error: | |
3329 | consumer_destroy_output(consumer); | |
3330 | error: | |
3331 | return ret; | |
3332 | } | |
3333 | ||
3334 | /* | |
3335 | * Command LTTNG_CREATE_SESSION processed by the client thread. | |
3336 | */ | |
3337 | static int cmd_create_session(char *name, char *path, lttng_sock_cred *creds) | |
3338 | { | |
3339 | int ret; | |
3340 | struct lttng_uri uri; | |
3341 | ||
3342 | /* Zeroed temporary URI */ | |
3343 | memset(&uri, 0, sizeof(uri)); | |
3344 | ||
3345 | uri.dtype = LTTNG_DST_PATH; | |
3346 | uri.utype = LTTNG_URI_DST; | |
3347 | strncpy(uri.dst.path, path, sizeof(uri.dst.path)); | |
3348 | ||
3349 | /* TODO: Strip date-time from path and put it in uri's subdir */ | |
3350 | ||
3351 | ret = cmd_create_session_uri(name, &uri, NULL, 1, creds); | |
3352 | if (ret != LTTCOMM_OK) { | |
3353 | goto error; | |
3354 | } | |
54d01ffb DG |
3355 | |
3356 | error: | |
3357 | return ret; | |
3358 | } | |
3359 | ||
3360 | /* | |
3361 | * Command LTTNG_DESTROY_SESSION processed by the client thread. | |
3362 | */ | |
3363 | static int cmd_destroy_session(struct ltt_session *session, char *name) | |
3364 | { | |
3365 | int ret; | |
3366 | ||
3367 | /* Clean kernel session teardown */ | |
3368 | teardown_kernel_session(session); | |
84cd17c6 MD |
3369 | /* UST session teardown */ |
3370 | teardown_ust_session(session); | |
54d01ffb DG |
3371 | |
3372 | /* | |
3373 | * Must notify the kernel thread here to update it's poll setin order | |
3374 | * to remove the channel(s)' fd just destroyed. | |
3375 | */ | |
3376 | ret = notify_thread_pipe(kernel_poll_pipe[1]); | |
3377 | if (ret < 0) { | |
76d7553f | 3378 | PERROR("write kernel poll pipe"); |
54d01ffb DG |
3379 | } |
3380 | ||
271933a4 | 3381 | ret = session_destroy(session); |
54d01ffb DG |
3382 | |
3383 | return ret; | |
3384 | } | |
3385 | ||
3386 | /* | |
3387 | * Command LTTNG_CALIBRATE processed by the client thread. | |
3388 | */ | |
3389 | static int cmd_calibrate(int domain, struct lttng_calibrate *calibrate) | |
3390 | { | |
3391 | int ret; | |
3392 | ||
3393 | switch (domain) { | |
3394 | case LTTNG_DOMAIN_KERNEL: | |
33a2b854 | 3395 | { |
54d01ffb | 3396 | struct lttng_kernel_calibrate kcalibrate; |
33a2b854 | 3397 | |
54d01ffb DG |
3398 | kcalibrate.type = calibrate->type; |
3399 | ret = kernel_calibrate(kernel_tracer_fd, &kcalibrate); | |
33a2b854 | 3400 | if (ret < 0) { |
54d01ffb DG |
3401 | ret = LTTCOMM_KERN_ENABLE_FAIL; |
3402 | goto error; | |
33a2b854 | 3403 | } |
54d01ffb DG |
3404 | break; |
3405 | } | |
4466912f DG |
3406 | case LTTNG_DOMAIN_UST: |
3407 | { | |
3408 | struct lttng_ust_calibrate ucalibrate; | |
3409 | ||
3410 | ucalibrate.type = calibrate->type; | |
3411 | ret = ust_app_calibrate_glb(&ucalibrate); | |
3412 | if (ret < 0) { | |
3413 | ret = LTTCOMM_UST_CALIBRATE_FAIL; | |
3414 | goto error; | |
3415 | } | |
3416 | break; | |
3417 | } | |
54d01ffb | 3418 | default: |
1ab1ea0b | 3419 | ret = LTTCOMM_UND; |
54d01ffb DG |
3420 | goto error; |
3421 | } | |
33a2b854 | 3422 | |
54d01ffb | 3423 | ret = LTTCOMM_OK; |
33a2b854 | 3424 | |
54d01ffb DG |
3425 | error: |
3426 | return ret; | |
3427 | } | |
7d29a247 | 3428 | |
54d01ffb DG |
3429 | /* |
3430 | * Command LTTNG_REGISTER_CONSUMER processed by the client thread. | |
3431 | */ | |
3432 | static int cmd_register_consumer(struct ltt_session *session, int domain, | |
3433 | char *sock_path) | |
3434 | { | |
3435 | int ret, sock; | |
b389abbe | 3436 | |
54d01ffb DG |
3437 | switch (domain) { |
3438 | case LTTNG_DOMAIN_KERNEL: | |
3439 | /* Can't register a consumer if there is already one */ | |
48c4f28c | 3440 | if (session->kernel_session->consumer_fds_sent != 0) { |
54d01ffb DG |
3441 | ret = LTTCOMM_KERN_CONSUMER_FAIL; |
3442 | goto error; | |
3443 | } | |
3444 | ||
3445 | sock = lttcomm_connect_unix_sock(sock_path); | |
3446 | if (sock < 0) { | |
3447 | ret = LTTCOMM_CONNECT_FAIL; | |
3448 | goto error; | |
3449 | } | |
3450 | ||
3451 | session->kernel_session->consumer_fd = sock; | |
3452 | break; | |
3453 | default: | |
3454 | /* TODO: Userspace tracing */ | |
1ab1ea0b | 3455 | ret = LTTCOMM_UND; |
54d01ffb DG |
3456 | goto error; |
3457 | } | |
3458 | ||
3459 | ret = LTTCOMM_OK; | |
3460 | ||
3461 | error: | |
3462 | return ret; | |
3463 | } | |
3464 | ||
3465 | /* | |
3466 | * Command LTTNG_LIST_DOMAINS processed by the client thread. | |
3467 | */ | |
3468 | static ssize_t cmd_list_domains(struct ltt_session *session, | |
3469 | struct lttng_domain **domains) | |
3470 | { | |
b551a063 | 3471 | int ret, index = 0; |
54d01ffb DG |
3472 | ssize_t nb_dom = 0; |
3473 | ||
3474 | if (session->kernel_session != NULL) { | |
b551a063 | 3475 | DBG3("Listing domains found kernel domain"); |
54d01ffb DG |
3476 | nb_dom++; |
3477 | } | |
3478 | ||
b551a063 DG |
3479 | if (session->ust_session != NULL) { |
3480 | DBG3("Listing domains found UST global domain"); | |
3481 | nb_dom++; | |
3482 | } | |
54d01ffb | 3483 | |
b551a063 | 3484 | *domains = zmalloc(nb_dom * sizeof(struct lttng_domain)); |
54d01ffb DG |
3485 | if (*domains == NULL) { |
3486 | ret = -LTTCOMM_FATAL; | |
3487 | goto error; | |
3488 | } | |
3489 | ||
b551a063 DG |
3490 | if (session->kernel_session != NULL) { |
3491 | (*domains)[index].type = LTTNG_DOMAIN_KERNEL; | |
3492 | index++; | |
3493 | } | |
3494 | ||
3495 | if (session->ust_session != NULL) { | |
3496 | (*domains)[index].type = LTTNG_DOMAIN_UST; | |
3497 | index++; | |
3498 | } | |
54d01ffb | 3499 | |
54d01ffb DG |
3500 | return nb_dom; |
3501 | ||
3502 | error: | |
3503 | return ret; | |
3504 | } | |
3505 | ||
3506 | /* | |
3507 | * Command LTTNG_LIST_CHANNELS processed by the client thread. | |
3508 | */ | |
b551a063 | 3509 | static ssize_t cmd_list_channels(int domain, struct ltt_session *session, |
54d01ffb DG |
3510 | struct lttng_channel **channels) |
3511 | { | |
3512 | int ret; | |
3513 | ssize_t nb_chan = 0; | |
3514 | ||
b551a063 DG |
3515 | switch (domain) { |
3516 | case LTTNG_DOMAIN_KERNEL: | |
3517 | if (session->kernel_session != NULL) { | |
3518 | nb_chan = session->kernel_session->channel_count; | |
3519 | } | |
0df502fd | 3520 | DBG3("Number of kernel channels %zd", nb_chan); |
b551a063 DG |
3521 | break; |
3522 | case LTTNG_DOMAIN_UST: | |
3523 | if (session->ust_session != NULL) { | |
bec39940 | 3524 | nb_chan = lttng_ht_get_count( |
b551a063 DG |
3525 | session->ust_session->domain_global.channels); |
3526 | } | |
0df502fd | 3527 | DBG3("Number of UST global channels %zd", nb_chan); |
b551a063 DG |
3528 | break; |
3529 | default: | |
3530 | *channels = NULL; | |
1ab1ea0b | 3531 | ret = -LTTCOMM_UND; |
54d01ffb DG |
3532 | goto error; |
3533 | } | |
3534 | ||
b551a063 DG |
3535 | if (nb_chan > 0) { |
3536 | *channels = zmalloc(nb_chan * sizeof(struct lttng_channel)); | |
3537 | if (*channels == NULL) { | |
3538 | ret = -LTTCOMM_FATAL; | |
3539 | goto error; | |
3540 | } | |
54d01ffb | 3541 | |
b551a063 DG |
3542 | list_lttng_channels(domain, session, *channels); |
3543 | } else { | |
3544 | *channels = NULL; | |
3545 | } | |
2bdd86d4 | 3546 | |
54d01ffb DG |
3547 | return nb_chan; |
3548 | ||
3549 | error: | |
3550 | return ret; | |
3551 | } | |
3552 | ||
3553 | /* | |
3554 | * Command LTTNG_LIST_EVENTS processed by the client thread. | |
3555 | */ | |
b551a063 | 3556 | static ssize_t cmd_list_events(int domain, struct ltt_session *session, |
54d01ffb DG |
3557 | char *channel_name, struct lttng_event **events) |
3558 | { | |
b551a063 | 3559 | int ret = 0; |
54d01ffb | 3560 | ssize_t nb_event = 0; |
54d01ffb | 3561 | |
b551a063 DG |
3562 | switch (domain) { |
3563 | case LTTNG_DOMAIN_KERNEL: | |
3564 | if (session->kernel_session != NULL) { | |
3565 | nb_event = list_lttng_kernel_events(channel_name, | |
3566 | session->kernel_session, events); | |
54d01ffb | 3567 | } |
b551a063 DG |
3568 | break; |
3569 | case LTTNG_DOMAIN_UST: | |
3570 | { | |
3571 | if (session->ust_session != NULL) { | |
3572 | nb_event = list_lttng_ust_global_events(channel_name, | |
3573 | &session->ust_session->domain_global, events); | |
3574 | } | |
3575 | break; | |
54d01ffb | 3576 | } |
b551a063 | 3577 | default: |
1ab1ea0b | 3578 | ret = -LTTCOMM_UND; |
54d01ffb DG |
3579 | goto error; |
3580 | } | |
3581 | ||
b551a063 | 3582 | ret = nb_event; |
54d01ffb DG |
3583 | |
3584 | error: | |
3585 | return ret; | |
3586 | } | |
3587 | ||
00e2e675 DG |
3588 | /* |
3589 | * Command LTTNG_SET_CONSUMER_URI processed by the client thread. | |
3590 | */ | |
3591 | static int cmd_set_consumer_uri(int domain, struct ltt_session *session, | |
3592 | struct lttng_uri *uri) | |
3593 | { | |
3594 | int ret; | |
3595 | struct ltt_kernel_session *ksess = session->kernel_session; | |
3596 | struct ltt_ust_session *usess = session->ust_session; | |
3597 | struct consumer_output *consumer; | |
3598 | ||
3599 | /* Can't enable consumer after session started. */ | |
3600 | if (session->enabled) { | |
3601 | ret = LTTCOMM_TRACE_ALREADY_STARTED; | |
3602 | goto error; | |
3603 | } | |
3604 | ||
3605 | switch (domain) { | |
3606 | case LTTNG_DOMAIN_KERNEL: | |
3607 | /* Code flow error if we don't have a kernel session here. */ | |
3608 | assert(ksess); | |
3609 | ||
3610 | /* Create consumer output if none exists */ | |
3611 | consumer = ksess->tmp_consumer; | |
3612 | if (consumer == NULL) { | |
3613 | consumer = consumer_copy_output(ksess->consumer); | |
3614 | if (consumer == NULL) { | |
3615 | ret = LTTCOMM_FATAL; | |
3616 | goto error; | |
3617 | } | |
3618 | /* Reassign new pointer */ | |
3619 | ksess->tmp_consumer = consumer; | |
3620 | } | |
3621 | ||
3622 | switch (uri->dtype) { | |
3623 | case LTTNG_DST_IPV4: | |
3624 | case LTTNG_DST_IPV6: | |
3625 | DBG2("Setting network URI for kernel session %s", session->name); | |
3626 | ||
3627 | /* Set URI into consumer output object */ | |
3628 | ret = consumer_set_network_uri(consumer, uri); | |
3629 | if (ret < 0) { | |
3630 | ret = LTTCOMM_FATAL; | |
3631 | goto error; | |
3632 | } | |
3633 | ||
3634 | /* On a new subdir, reappend the default trace dir. */ | |
3635 | if (strlen(uri->subdir) != 0) { | |
3636 | strncat(consumer->subdir, DEFAULT_KERNEL_TRACE_DIR, | |
3637 | sizeof(consumer->subdir)); | |
3638 | } | |
3639 | ||
3640 | ret = send_socket_relayd_consumer(domain, session, uri, consumer, | |
3641 | ksess->consumer_fd); | |
3642 | if (ret != LTTCOMM_OK) { | |
3643 | goto error; | |
3644 | } | |
3645 | break; | |
3646 | case LTTNG_DST_PATH: | |
3647 | DBG2("Setting trace directory path from URI to %s", uri->dst.path); | |
3648 | memset(consumer->dst.trace_path, 0, | |
3649 | sizeof(consumer->dst.trace_path)); | |
3650 | strncpy(consumer->dst.trace_path, uri->dst.path, | |
3651 | sizeof(consumer->dst.trace_path)); | |
3652 | /* Append default kernel trace dir */ | |
3653 | strncat(consumer->dst.trace_path, DEFAULT_KERNEL_TRACE_DIR, | |
3654 | sizeof(consumer->dst.trace_path)); | |
3655 | break; | |
3656 | } | |
3657 | ||
3658 | /* All good! */ | |
3659 | break; | |
3660 | case LTTNG_DOMAIN_UST: | |
3661 | /* Code flow error if we don't have a kernel session here. */ | |
3662 | assert(usess); | |
3663 | ||
3664 | /* Create consumer output if none exists */ | |
3665 | consumer = usess->tmp_consumer; | |
3666 | if (consumer == NULL) { | |
3667 | consumer = consumer_copy_output(usess->consumer); | |
3668 | if (consumer == NULL) { | |
3669 | ret = LTTCOMM_FATAL; | |
3670 | goto error; | |
3671 | } | |
3672 | /* Reassign new pointer */ | |
3673 | usess->tmp_consumer = consumer; | |
3674 | } | |
3675 | ||
3676 | switch (uri->dtype) { | |
3677 | case LTTNG_DST_IPV4: | |
3678 | case LTTNG_DST_IPV6: | |
3679 | { | |
3680 | DBG2("Setting network URI for UST session %s", session->name); | |
3681 | ||
3682 | /* Set URI into consumer object */ | |
3683 | ret = consumer_set_network_uri(consumer, uri); | |
3684 | if (ret < 0) { | |
3685 | ret = LTTCOMM_FATAL; | |
3686 | goto error; | |
3687 | } | |
3688 | ||
3689 | /* On a new subdir, reappend the default trace dir. */ | |
3690 | if (strlen(uri->subdir) != 0) { | |
3691 | strncat(consumer->subdir, DEFAULT_UST_TRACE_DIR, | |
3692 | sizeof(consumer->subdir)); | |
3693 | } | |
3694 | ||
3695 | if (ust_consumerd64_fd >= 0) { | |
3696 | ret = send_socket_relayd_consumer(domain, session, uri, | |
3697 | consumer, ust_consumerd64_fd); | |
3698 | if (ret != LTTCOMM_OK) { | |
3699 | goto error; | |
3700 | } | |
3701 | } | |
3702 | ||
3703 | if (ust_consumerd32_fd >= 0) { | |
3704 | ret = send_socket_relayd_consumer(domain, session, uri, | |
3705 | consumer, ust_consumerd32_fd); | |
3706 | if (ret != LTTCOMM_OK) { | |
3707 | goto error; | |
3708 | } | |
3709 | } | |
3710 | ||
3711 | break; | |
3712 | } | |
3713 | case LTTNG_DST_PATH: | |
3714 | DBG2("Setting trace directory path from URI to %s", uri->dst.path); | |
3715 | memset(consumer->dst.trace_path, 0, | |
3716 | sizeof(consumer->dst.trace_path)); | |
3717 | strncpy(consumer->dst.trace_path, uri->dst.path, | |
3718 | sizeof(consumer->dst.trace_path)); | |
3719 | /* Append default UST trace dir */ | |
3720 | strncat(consumer->dst.trace_path, DEFAULT_UST_TRACE_DIR, | |
3721 | sizeof(consumer->dst.trace_path)); | |
3722 | break; | |
3723 | } | |
3724 | break; | |
3725 | } | |
3726 | ||
3727 | /* All good! */ | |
3728 | ret = LTTCOMM_OK; | |
3729 | ||
3730 | error: | |
3731 | return ret; | |
3732 | } | |
3733 | ||
3734 | /* | |
3735 | * Command LTTNG_DISABLE_CONSUMER processed by the client thread. | |
3736 | */ | |
3737 | static int cmd_disable_consumer(int domain, struct ltt_session *session) | |
3738 | { | |
3739 | int ret; | |
3740 | struct ltt_kernel_session *ksess = session->kernel_session; | |
3741 | struct ltt_ust_session *usess = session->ust_session; | |
3742 | struct consumer_output *consumer; | |
3743 | ||
3744 | if (session->enabled) { | |
3745 | /* Can't disable consumer on an already started session */ | |
3746 | ret = LTTCOMM_TRACE_ALREADY_STARTED; | |
3747 | goto error; | |
3748 | } | |
3749 | ||
3750 | switch (domain) { | |
3751 | case LTTNG_DOMAIN_KERNEL: | |
3752 | /* Code flow error if we don't have a kernel session here. */ | |
3753 | assert(ksess); | |
3754 | ||
3755 | DBG("Disabling kernel consumer"); | |
3756 | consumer = ksess->consumer; | |
3757 | ||
3758 | break; | |
3759 | case LTTNG_DOMAIN_UST: | |
3760 | /* Code flow error if we don't have a UST session here. */ | |
3761 | assert(usess); | |
3762 | ||
3763 | DBG("Disabling UST consumer"); | |
3764 | consumer = usess->consumer; | |
3765 | ||
3766 | break; | |
3767 | default: | |
3768 | ret = LTTCOMM_UNKNOWN_DOMAIN; | |
3769 | goto error; | |
3770 | } | |
3771 | ||
3772 | assert(consumer); | |
3773 | consumer->enabled = 0; | |
3774 | ||
3775 | /* Success at this point */ | |
3776 | ret = LTTCOMM_OK; | |
3777 | ||
3778 | error: | |
3779 | return ret; | |
3780 | } | |
3781 | ||
3782 | /* | |
3783 | * Command LTTNG_ENABLE_CONSUMER processed by the client thread. | |
3784 | */ | |
3785 | static int cmd_enable_consumer(int domain, struct ltt_session *session) | |
3786 | { | |
3787 | int ret; | |
3788 | struct ltt_kernel_session *ksess = session->kernel_session; | |
3789 | struct ltt_ust_session *usess = session->ust_session; | |
3790 | struct consumer_output *tmp_out; | |
3791 | ||
3792 | /* Can't enable consumer after session started. */ | |
3793 | if (session->enabled) { | |
3794 | ret = LTTCOMM_TRACE_ALREADY_STARTED; | |
3795 | goto error; | |
3796 | } | |
3797 | ||
3798 | switch (domain) { | |
3799 | case LTTNG_DOMAIN_KERNEL: | |
3800 | /* Code flow error if we don't have a kernel session here. */ | |
3801 | assert(ksess); | |
3802 | ||
3803 | /* | |
3804 | * Check if we have already sent fds to the consumer. In that case, | |
3805 | * the enable-consumer command can't be used because a start trace | |
3806 | * had previously occured. | |
3807 | */ | |
3808 | if (ksess->consumer_fds_sent) { | |
3809 | ret = LTTCOMM_ENABLE_CONSUMER_FAIL; | |
3810 | goto error; | |
3811 | } | |
3812 | ||
3813 | tmp_out = ksess->tmp_consumer; | |
3814 | if (tmp_out == NULL) { | |
3815 | /* No temp. consumer output exists. Using the current one. */ | |
3816 | DBG3("No temporary consumer. Using default"); | |
3817 | ret = LTTCOMM_OK; | |
3818 | goto error; | |
3819 | } | |
3820 | ||
3821 | switch (tmp_out->type) { | |
3822 | case CONSUMER_DST_LOCAL: | |
3823 | DBG2("Consumer output is local. Creating directory(ies)"); | |
3824 | ||
3825 | /* Create directory(ies) */ | |
3826 | ret = run_as_mkdir_recursive(tmp_out->dst.trace_path, | |
3827 | S_IRWXU | S_IRWXG, session->uid, session->gid); | |
3828 | if (ret < 0) { | |
3829 | if (ret != -EEXIST) { | |
3830 | ERR("Trace directory creation error"); | |
3831 | ret = LTTCOMM_FATAL; | |
3832 | goto error; | |
3833 | } | |
3834 | } | |
3835 | break; | |
3836 | case CONSUMER_DST_NET: | |
3837 | DBG2("Consumer output is network. Validating URIs"); | |
3838 | /* Validate if we have both control and data path set. */ | |
3839 | if (!tmp_out->dst.net.control_isset) { | |
3840 | ret = LTTCOMM_URI_CTRL_MISS; | |
3841 | goto error; | |
3842 | } | |
3843 | ||
3844 | if (!tmp_out->dst.net.data_isset) { | |
3845 | ret = LTTCOMM_URI_DATA_MISS; | |
3846 | goto error; | |
3847 | } | |
3848 | ||
3849 | /* Check established network session state */ | |
3850 | if (session->net_handle == 0) { | |
3851 | ret = LTTCOMM_ENABLE_CONSUMER_FAIL; | |
3852 | ERR("Session network handle is not set on enable-consumer"); | |
3853 | goto error; | |
3854 | } | |
3855 | ||
3856 | /* Append default kernel trace dir to subdir */ | |
3857 | strncat(ksess->consumer->subdir, DEFAULT_KERNEL_TRACE_DIR, | |
3858 | sizeof(ksess->consumer->subdir)); | |
3859 | ||
3860 | break; | |
3861 | } | |
3862 | ||
3863 | /* | |
3864 | * @session-lock | |
3865 | * This is race free for now since the session lock is acquired before | |
3866 | * ending up in this function. No other threads can access this kernel | |
3867 | * session without this lock hence freeing the consumer output object | |
3868 | * is valid. | |
3869 | */ | |
3870 | consumer_destroy_output(ksess->consumer); | |
3871 | ksess->consumer = tmp_out; | |
3872 | ksess->tmp_consumer = NULL; | |
3873 | ||
3874 | break; | |
3875 | case LTTNG_DOMAIN_UST: | |
3876 | /* Code flow error if we don't have a UST session here. */ | |
3877 | assert(usess); | |
3878 | ||
3879 | /* | |
3880 | * Check if we have already sent fds to the consumer. In that case, | |
3881 | * the enable-consumer command can't be used because a start trace | |
3882 | * had previously occured. | |
3883 | */ | |
3884 | if (usess->start_trace) { | |
3885 | ret = LTTCOMM_ENABLE_CONSUMER_FAIL; | |
3886 | goto error; | |
3887 | } | |
3888 | ||
3889 | tmp_out = usess->tmp_consumer; | |
3890 | if (tmp_out == NULL) { | |
3891 | /* No temp. consumer output exists. Using the current one. */ | |
3892 | DBG3("No temporary consumer. Using default"); | |
3893 | ret = LTTCOMM_OK; | |
3894 | goto error; | |
3895 | } | |
3896 | ||
3897 | switch (tmp_out->type) { | |
3898 | case CONSUMER_DST_LOCAL: | |
3899 | DBG2("Consumer output is local. Creating directory(ies)"); | |
3900 | ||
3901 | /* Create directory(ies) */ | |
3902 | ret = run_as_mkdir_recursive(tmp_out->dst.trace_path, | |
3903 | S_IRWXU | S_IRWXG, session->uid, session->gid); | |
3904 | if (ret < 0) { | |
3905 | if (ret != -EEXIST) { | |
3906 | ERR("Trace directory creation error"); | |
3907 | ret = LTTCOMM_FATAL; | |
3908 | goto error; | |
3909 | } | |
3910 | } | |
3911 | break; | |
3912 | case CONSUMER_DST_NET: | |
3913 | DBG2("Consumer output is network. Validating URIs"); | |
3914 | /* Validate if we have both control and data path set. */ | |
3915 | if (!tmp_out->dst.net.control_isset) { | |
3916 | ret = LTTCOMM_URI_CTRL_MISS; | |
3917 | goto error; | |
3918 | } | |
3919 | ||
3920 | if (!tmp_out->dst.net.data_isset) { | |
3921 | ret = LTTCOMM_URI_DATA_MISS; | |
3922 | goto error; | |
3923 | } | |
3924 | ||
3925 | /* Check established network session state */ | |
3926 | if (session->net_handle == 0) { | |
3927 | ret = LTTCOMM_ENABLE_CONSUMER_FAIL; | |
3928 | DBG2("Session network handle is not set on enable-consumer"); | |
3929 | goto error; | |
3930 | } | |
3931 | ||
3932 | if (tmp_out->net_seq_index == -1) { | |
3933 | ret = LTTCOMM_ENABLE_CONSUMER_FAIL; | |
3934 | DBG2("Network index is not set on the consumer"); | |
3935 | goto error; | |
3936 | } | |
3937 | ||
3938 | /* Append default kernel trace dir to subdir */ | |
3939 | strncat(usess->consumer->subdir, DEFAULT_UST_TRACE_DIR, | |
3940 | sizeof(usess->consumer->subdir)); | |
3941 | ||
3942 | break; | |
3943 | } | |
3944 | ||
3945 | /* | |
3946 | * @session-lock | |
3947 | * This is race free for now since the session lock is acquired before | |
3948 | * ending up in this function. No other threads can access this kernel | |
3949 | * session without this lock hence freeing the consumer output object | |
3950 | * is valid. | |
3951 | */ | |
3952 | consumer_destroy_output(usess->consumer); | |
3953 | usess->consumer = tmp_out; | |
3954 | usess->tmp_consumer = NULL; | |
3955 | ||
3956 | break; | |
3957 | } | |
3958 | ||
3959 | /* Success at this point */ | |
3960 | ret = LTTCOMM_OK; | |
3961 | ||
3962 | error: | |
3963 | return ret; | |
3964 | } | |
3965 | ||
54d01ffb DG |
3966 | /* |
3967 | * Process the command requested by the lttng client within the command | |
3968 | * context structure. This function make sure that the return structure (llm) | |
3969 | * is set and ready for transmission before returning. | |
3970 | * | |
3971 | * Return any error encountered or 0 for success. | |
53a80697 MD |
3972 | * |
3973 | * "sock" is only used for special-case var. len data. | |
54d01ffb | 3974 | */ |
53a80697 MD |
3975 | static int process_client_msg(struct command_ctx *cmd_ctx, int sock, |
3976 | int *sock_error) | |
54d01ffb DG |
3977 | { |
3978 | int ret = LTTCOMM_OK; | |
44d3bd01 | 3979 | int need_tracing_session = 1; |
2e09ba09 | 3980 | int need_domain; |
54d01ffb DG |
3981 | |
3982 | DBG("Processing client command %d", cmd_ctx->lsm->cmd_type); | |
3983 | ||
53a80697 MD |
3984 | *sock_error = 0; |
3985 | ||
2e09ba09 MD |
3986 | switch (cmd_ctx->lsm->cmd_type) { |
3987 | case LTTNG_CREATE_SESSION: | |
00e2e675 | 3988 | case LTTNG_CREATE_SESSION_URI: |
2e09ba09 MD |
3989 | case LTTNG_DESTROY_SESSION: |
3990 | case LTTNG_LIST_SESSIONS: | |
3991 | case LTTNG_LIST_DOMAINS: | |
3992 | case LTTNG_START_TRACE: | |
3993 | case LTTNG_STOP_TRACE: | |
3994 | need_domain = 0; | |
3aace903 | 3995 | break; |
2e09ba09 MD |
3996 | default: |
3997 | need_domain = 1; | |
3998 | } | |
3999 | ||
4000 | if (opt_no_kernel && need_domain | |
4001 | && cmd_ctx->lsm->domain.type == LTTNG_DOMAIN_KERNEL) { | |
531d29f9 MD |
4002 | if (!is_root) { |
4003 | ret = LTTCOMM_NEED_ROOT_SESSIOND; | |
4004 | } else { | |
4005 | ret = LTTCOMM_KERN_NA; | |
4006 | } | |
4fba7219 DG |
4007 | goto error; |
4008 | } | |
4009 | ||
54d01ffb DG |
4010 | /* |
4011 | * Check for command that don't needs to allocate a returned payload. We do | |
44d3bd01 | 4012 | * this here so we don't have to make the call for no payload at each |
54d01ffb DG |
4013 | * command. |
4014 | */ | |
4015 | switch(cmd_ctx->lsm->cmd_type) { | |
4016 | case LTTNG_LIST_SESSIONS: | |
4017 | case LTTNG_LIST_TRACEPOINTS: | |
f37d259d | 4018 | case LTTNG_LIST_TRACEPOINT_FIELDS: |
54d01ffb DG |
4019 | case LTTNG_LIST_DOMAINS: |
4020 | case LTTNG_LIST_CHANNELS: | |
4021 | case LTTNG_LIST_EVENTS: | |
4022 | break; | |
4023 | default: | |
4024 | /* Setup lttng message with no payload */ | |
4025 | ret = setup_lttng_msg(cmd_ctx, 0); | |
4026 | if (ret < 0) { | |
4027 | /* This label does not try to unlock the session */ | |
4028 | goto init_setup_error; | |
4029 | } | |
4030 | } | |
4031 | ||
4032 | /* Commands that DO NOT need a session. */ | |
4033 | switch (cmd_ctx->lsm->cmd_type) { | |
54d01ffb | 4034 | case LTTNG_CREATE_SESSION: |
00e2e675 | 4035 | case LTTNG_CREATE_SESSION_URI: |
2e09ba09 | 4036 | case LTTNG_CALIBRATE: |
54d01ffb DG |
4037 | case LTTNG_LIST_SESSIONS: |
4038 | case LTTNG_LIST_TRACEPOINTS: | |
f37d259d | 4039 | case LTTNG_LIST_TRACEPOINT_FIELDS: |
44d3bd01 | 4040 | need_tracing_session = 0; |
54d01ffb DG |
4041 | break; |
4042 | default: | |
4043 | DBG("Getting session %s by name", cmd_ctx->lsm->session.name); | |
256a5576 MD |
4044 | /* |
4045 | * We keep the session list lock across _all_ commands | |
4046 | * for now, because the per-session lock does not | |
4047 | * handle teardown properly. | |
4048 | */ | |
74babd95 | 4049 | session_lock_list(); |
54d01ffb DG |
4050 | cmd_ctx->session = session_find_by_name(cmd_ctx->lsm->session.name); |
4051 | if (cmd_ctx->session == NULL) { | |
4052 | if (cmd_ctx->lsm->session.name != NULL) { | |
4053 | ret = LTTCOMM_SESS_NOT_FOUND; | |
4054 | } else { | |
4055 | /* If no session name specified */ | |
4056 | ret = LTTCOMM_SELECT_SESS; | |
4057 | } | |
4058 | goto error; | |
4059 | } else { | |
4060 | /* Acquire lock for the session */ | |
4061 | session_lock(cmd_ctx->session); | |
4062 | } | |
4063 | break; | |
4064 | } | |
b389abbe | 4065 | |
2e09ba09 MD |
4066 | if (!need_domain) { |
4067 | goto skip_domain; | |
4068 | } | |
54d01ffb DG |
4069 | /* |
4070 | * Check domain type for specific "pre-action". | |
4071 | */ | |
4072 | switch (cmd_ctx->lsm->domain.type) { | |
4073 | case LTTNG_DOMAIN_KERNEL: | |
d1f1c568 | 4074 | if (!is_root) { |
531d29f9 | 4075 | ret = LTTCOMM_NEED_ROOT_SESSIOND; |
d1f1c568 DG |
4076 | goto error; |
4077 | } | |
4078 | ||
54d01ffb | 4079 | /* Kernel tracer check */ |
a4b35e07 | 4080 | if (kernel_tracer_fd == -1) { |
54d01ffb | 4081 | /* Basically, load kernel tracer modules */ |
096102bd DG |
4082 | ret = init_kernel_tracer(); |
4083 | if (ret != 0) { | |
54d01ffb DG |
4084 | goto error; |
4085 | } | |
4086 | } | |
5eb91c98 | 4087 | |
5c827ce0 DG |
4088 | /* Consumer is in an ERROR state. Report back to client */ |
4089 | if (uatomic_read(&kernel_consumerd_state) == CONSUMER_ERROR) { | |
4090 | ret = LTTCOMM_NO_KERNCONSUMERD; | |
4091 | goto error; | |
4092 | } | |
4093 | ||
54d01ffb | 4094 | /* Need a session for kernel command */ |
44d3bd01 | 4095 | if (need_tracing_session) { |
54d01ffb | 4096 | if (cmd_ctx->session->kernel_session == NULL) { |
6df2e2c9 | 4097 | ret = create_kernel_session(cmd_ctx->session); |
5eb91c98 | 4098 | if (ret < 0) { |
54d01ffb | 4099 | ret = LTTCOMM_KERN_SESS_FAIL; |
5eb91c98 DG |
4100 | goto error; |
4101 | } | |
b389abbe | 4102 | } |
7d29a247 | 4103 | |
54d01ffb | 4104 | /* Start the kernel consumer daemon */ |
3bd1e081 MD |
4105 | pthread_mutex_lock(&kconsumer_data.pid_mutex); |
4106 | if (kconsumer_data.pid == 0 && | |
54d01ffb | 4107 | cmd_ctx->lsm->cmd_type != LTTNG_REGISTER_CONSUMER) { |
3bd1e081 MD |
4108 | pthread_mutex_unlock(&kconsumer_data.pid_mutex); |
4109 | ret = start_consumerd(&kconsumer_data); | |
7d29a247 | 4110 | if (ret < 0) { |
54d01ffb DG |
4111 | ret = LTTCOMM_KERN_CONSUMER_FAIL; |
4112 | goto error; | |
950131af | 4113 | } |
5c827ce0 | 4114 | uatomic_set(&kernel_consumerd_state, CONSUMER_STARTED); |
00e2e675 DG |
4115 | |
4116 | /* Set consumer fd of the session */ | |
4117 | cmd_ctx->session->kernel_session->consumer_fd = | |
4118 | kconsumer_data.cmd_sock; | |
3ff2ecac MD |
4119 | } else { |
4120 | pthread_mutex_unlock(&kconsumer_data.pid_mutex); | |
33a2b854 | 4121 | } |
0d0c377a | 4122 | } |
5c827ce0 | 4123 | |
54d01ffb | 4124 | break; |
2bdd86d4 | 4125 | case LTTNG_DOMAIN_UST: |
44d3bd01 | 4126 | { |
5c827ce0 DG |
4127 | /* Consumer is in an ERROR state. Report back to client */ |
4128 | if (uatomic_read(&ust_consumerd_state) == CONSUMER_ERROR) { | |
4129 | ret = LTTCOMM_NO_USTCONSUMERD; | |
4130 | goto error; | |
4131 | } | |
4132 | ||
44d3bd01 | 4133 | if (need_tracing_session) { |
f6a9efaa | 4134 | if (cmd_ctx->session->ust_session == NULL) { |
44d3bd01 | 4135 | ret = create_ust_session(cmd_ctx->session, |
6df2e2c9 | 4136 | &cmd_ctx->lsm->domain); |
44d3bd01 DG |
4137 | if (ret != LTTCOMM_OK) { |
4138 | goto error; | |
4139 | } | |
4140 | } | |
00e2e675 | 4141 | |
7753dea8 MD |
4142 | /* Start the UST consumer daemons */ |
4143 | /* 64-bit */ | |
4144 | pthread_mutex_lock(&ustconsumer64_data.pid_mutex); | |
fc7a59ce | 4145 | if (consumerd64_bin[0] != '\0' && |
7753dea8 | 4146 | ustconsumer64_data.pid == 0 && |
2bdd86d4 | 4147 | cmd_ctx->lsm->cmd_type != LTTNG_REGISTER_CONSUMER) { |
7753dea8 MD |
4148 | pthread_mutex_unlock(&ustconsumer64_data.pid_mutex); |
4149 | ret = start_consumerd(&ustconsumer64_data); | |
2bdd86d4 | 4150 | if (ret < 0) { |
7753dea8 MD |
4151 | ret = LTTCOMM_UST_CONSUMER64_FAIL; |
4152 | ust_consumerd64_fd = -EINVAL; | |
2bdd86d4 MD |
4153 | goto error; |
4154 | } | |
48842b30 | 4155 | |
7753dea8 | 4156 | ust_consumerd64_fd = ustconsumer64_data.cmd_sock; |
5c827ce0 | 4157 | uatomic_set(&ust_consumerd_state, CONSUMER_STARTED); |
3ff2ecac | 4158 | } else { |
7753dea8 MD |
4159 | pthread_mutex_unlock(&ustconsumer64_data.pid_mutex); |
4160 | } | |
4161 | /* 32-bit */ | |
fc7a59ce | 4162 | if (consumerd32_bin[0] != '\0' && |
7753dea8 MD |
4163 | ustconsumer32_data.pid == 0 && |
4164 | cmd_ctx->lsm->cmd_type != LTTNG_REGISTER_CONSUMER) { | |
4165 | pthread_mutex_unlock(&ustconsumer32_data.pid_mutex); | |
4166 | ret = start_consumerd(&ustconsumer32_data); | |
4167 | if (ret < 0) { | |
4168 | ret = LTTCOMM_UST_CONSUMER32_FAIL; | |
4169 | ust_consumerd32_fd = -EINVAL; | |
4170 | goto error; | |
4171 | } | |
5c827ce0 | 4172 | |
7753dea8 | 4173 | ust_consumerd32_fd = ustconsumer32_data.cmd_sock; |
5c827ce0 | 4174 | uatomic_set(&ust_consumerd_state, CONSUMER_STARTED); |
7753dea8 MD |
4175 | } else { |
4176 | pthread_mutex_unlock(&ustconsumer32_data.pid_mutex); | |
2bdd86d4 | 4177 | } |
44d3bd01 DG |
4178 | } |
4179 | break; | |
48842b30 | 4180 | } |
54d01ffb | 4181 | default: |
54d01ffb DG |
4182 | break; |
4183 | } | |
2e09ba09 | 4184 | skip_domain: |
33a2b854 | 4185 | |
5c827ce0 DG |
4186 | /* Validate consumer daemon state when start/stop trace command */ |
4187 | if (cmd_ctx->lsm->cmd_type == LTTNG_START_TRACE || | |
4188 | cmd_ctx->lsm->cmd_type == LTTNG_STOP_TRACE) { | |
4189 | switch (cmd_ctx->lsm->domain.type) { | |
4190 | case LTTNG_DOMAIN_UST: | |
4191 | if (uatomic_read(&ust_consumerd_state) != CONSUMER_STARTED) { | |
4192 | ret = LTTCOMM_NO_USTCONSUMERD; | |
4193 | goto error; | |
4194 | } | |
4195 | break; | |
4196 | case LTTNG_DOMAIN_KERNEL: | |
4197 | if (uatomic_read(&kernel_consumerd_state) != CONSUMER_STARTED) { | |
4198 | ret = LTTCOMM_NO_KERNCONSUMERD; | |
4199 | goto error; | |
4200 | } | |
4201 | break; | |
4202 | } | |
4203 | } | |
4204 | ||
8e0af1b4 MD |
4205 | /* |
4206 | * Check that the UID or GID match that of the tracing session. | |
4207 | * The root user can interact with all sessions. | |
4208 | */ | |
4209 | if (need_tracing_session) { | |
4210 | if (!session_access_ok(cmd_ctx->session, | |
730389d9 DG |
4211 | LTTNG_SOCK_GET_UID_CRED(&cmd_ctx->creds), |
4212 | LTTNG_SOCK_GET_GID_CRED(&cmd_ctx->creds))) { | |
8e0af1b4 MD |
4213 | ret = LTTCOMM_EPERM; |
4214 | goto error; | |
4215 | } | |
4216 | } | |
4217 | ||
54d01ffb DG |
4218 | /* Process by command type */ |
4219 | switch (cmd_ctx->lsm->cmd_type) { | |
4220 | case LTTNG_ADD_CONTEXT: | |
4221 | { | |
4222 | ret = cmd_add_context(cmd_ctx->session, cmd_ctx->lsm->domain.type, | |
4223 | cmd_ctx->lsm->u.context.channel_name, | |
4224 | cmd_ctx->lsm->u.context.event_name, | |
4225 | &cmd_ctx->lsm->u.context.ctx); | |
4226 | break; | |
4227 | } | |
4228 | case LTTNG_DISABLE_CHANNEL: | |
4229 | { | |
4230 | ret = cmd_disable_channel(cmd_ctx->session, cmd_ctx->lsm->domain.type, | |
4231 | cmd_ctx->lsm->u.disable.channel_name); | |
4232 | break; | |
4233 | } | |
4234 | case LTTNG_DISABLE_EVENT: | |
4235 | { | |
4236 | ret = cmd_disable_event(cmd_ctx->session, cmd_ctx->lsm->domain.type, | |
4237 | cmd_ctx->lsm->u.disable.channel_name, | |
4238 | cmd_ctx->lsm->u.disable.name); | |
33a2b854 DG |
4239 | break; |
4240 | } | |
54d01ffb DG |
4241 | case LTTNG_DISABLE_ALL_EVENT: |
4242 | { | |
2bdd86d4 | 4243 | DBG("Disabling all events"); |
54d01ffb DG |
4244 | |
4245 | ret = cmd_disable_event_all(cmd_ctx->session, cmd_ctx->lsm->domain.type, | |
4246 | cmd_ctx->lsm->u.disable.channel_name); | |
4247 | break; | |
4248 | } | |
00e2e675 DG |
4249 | case LTTNG_DISABLE_CONSUMER: |
4250 | { | |
4251 | ret = cmd_disable_consumer(cmd_ctx->lsm->domain.type, cmd_ctx->session); | |
4252 | break; | |
4253 | } | |
54d01ffb DG |
4254 | case LTTNG_ENABLE_CHANNEL: |
4255 | { | |
aea829b3 | 4256 | ret = cmd_enable_channel(cmd_ctx->session, cmd_ctx->lsm->domain.type, |
54d01ffb DG |
4257 | &cmd_ctx->lsm->u.channel.chan); |
4258 | break; | |
4259 | } | |
00e2e675 DG |
4260 | case LTTNG_ENABLE_CONSUMER: |
4261 | { | |
4262 | ret = cmd_enable_consumer(cmd_ctx->lsm->domain.type, cmd_ctx->session); | |
4263 | break; | |
4264 | } | |
54d01ffb DG |
4265 | case LTTNG_ENABLE_EVENT: |
4266 | { | |
4267 | ret = cmd_enable_event(cmd_ctx->session, cmd_ctx->lsm->domain.type, | |
4268 | cmd_ctx->lsm->u.enable.channel_name, | |
4269 | &cmd_ctx->lsm->u.enable.event); | |
4270 | break; | |
4271 | } | |
4272 | case LTTNG_ENABLE_ALL_EVENT: | |
4273 | { | |
2bdd86d4 | 4274 | DBG("Enabling all events"); |
54d01ffb DG |
4275 | |
4276 | ret = cmd_enable_event_all(cmd_ctx->session, cmd_ctx->lsm->domain.type, | |
8c9ae521 DG |
4277 | cmd_ctx->lsm->u.enable.channel_name, |
4278 | cmd_ctx->lsm->u.enable.event.type); | |
54d01ffb DG |
4279 | break; |
4280 | } | |
052da939 | 4281 | case LTTNG_LIST_TRACEPOINTS: |
2ef84c95 | 4282 | { |
9f19cc17 | 4283 | struct lttng_event *events; |
54d01ffb | 4284 | ssize_t nb_events; |
052da939 | 4285 | |
54d01ffb DG |
4286 | nb_events = cmd_list_tracepoints(cmd_ctx->lsm->domain.type, &events); |
4287 | if (nb_events < 0) { | |
4288 | ret = -nb_events; | |
4289 | goto error; | |
2ef84c95 DG |
4290 | } |
4291 | ||
4292 | /* | |
4293 | * Setup lttng message with payload size set to the event list size in | |
4294 | * bytes and then copy list into the llm payload. | |
4295 | */ | |
052da939 | 4296 | ret = setup_lttng_msg(cmd_ctx, sizeof(struct lttng_event) * nb_events); |
2ef84c95 | 4297 | if (ret < 0) { |
052da939 | 4298 | free(events); |
2ef84c95 DG |
4299 | goto setup_error; |
4300 | } | |
4301 | ||
4302 | /* Copy event list into message payload */ | |
9f19cc17 | 4303 | memcpy(cmd_ctx->llm->payload, events, |
052da939 | 4304 | sizeof(struct lttng_event) * nb_events); |
2ef84c95 | 4305 | |
9f19cc17 | 4306 | free(events); |
2ef84c95 DG |
4307 | |
4308 | ret = LTTCOMM_OK; | |
4309 | break; | |
4310 | } | |
f37d259d MD |
4311 | case LTTNG_LIST_TRACEPOINT_FIELDS: |
4312 | { | |
4313 | struct lttng_event_field *fields; | |
4314 | ssize_t nb_fields; | |
4315 | ||
4316 | nb_fields = cmd_list_tracepoint_fields(cmd_ctx->lsm->domain.type, &fields); | |
4317 | if (nb_fields < 0) { | |
4318 | ret = -nb_fields; | |
4319 | goto error; | |
4320 | } | |
4321 | ||
4322 | /* | |
4323 | * Setup lttng message with payload size set to the event list size in | |
4324 | * bytes and then copy list into the llm payload. | |
4325 | */ | |
4326 | ret = setup_lttng_msg(cmd_ctx, sizeof(struct lttng_event_field) * nb_fields); | |
4327 | if (ret < 0) { | |
4328 | free(fields); | |
4329 | goto setup_error; | |
4330 | } | |
4331 | ||
4332 | /* Copy event list into message payload */ | |
4333 | memcpy(cmd_ctx->llm->payload, fields, | |
4334 | sizeof(struct lttng_event_field) * nb_fields); | |
4335 | ||
4336 | free(fields); | |
4337 | ||
4338 | ret = LTTCOMM_OK; | |
4339 | break; | |
4340 | } | |
00e2e675 DG |
4341 | case LTTNG_SET_CONSUMER_URI: |
4342 | { | |
4343 | ret = cmd_set_consumer_uri(cmd_ctx->lsm->domain.type, cmd_ctx->session, | |
4344 | &cmd_ctx->lsm->u.uri); | |
4345 | break; | |
4346 | } | |
f3ed775e | 4347 | case LTTNG_START_TRACE: |
8c0faa1d | 4348 | { |
54d01ffb | 4349 | ret = cmd_start_trace(cmd_ctx->session); |
8c0faa1d DG |
4350 | break; |
4351 | } | |
f3ed775e | 4352 | case LTTNG_STOP_TRACE: |
8c0faa1d | 4353 | { |
54d01ffb | 4354 | ret = cmd_stop_trace(cmd_ctx->session); |
8c0faa1d DG |
4355 | break; |
4356 | } | |
5e16da05 MD |
4357 | case LTTNG_CREATE_SESSION: |
4358 | { | |
54d01ffb | 4359 | ret = cmd_create_session(cmd_ctx->lsm->session.name, |
6df2e2c9 | 4360 | cmd_ctx->lsm->session.path, &cmd_ctx->creds); |
5e16da05 MD |
4361 | break; |
4362 | } | |
00e2e675 DG |
4363 | case LTTNG_CREATE_SESSION_URI: |
4364 | { | |
4365 | ret = cmd_create_session_uri(cmd_ctx->lsm->session.name, | |
4366 | &cmd_ctx->lsm->u.create_uri.ctrl_uri, | |
4367 | &cmd_ctx->lsm->u.create_uri.data_uri, | |
4368 | cmd_ctx->lsm->u.create_uri.enable_consumer, &cmd_ctx->creds); | |
4369 | break; | |
4370 | } | |
5e16da05 MD |
4371 | case LTTNG_DESTROY_SESSION: |
4372 | { | |
54d01ffb DG |
4373 | ret = cmd_destroy_session(cmd_ctx->session, |
4374 | cmd_ctx->lsm->session.name); | |
256a5576 MD |
4375 | /* |
4376 | * Set session to NULL so we do not unlock it after | |
4377 | * free. | |
4378 | */ | |
4379 | cmd_ctx->session = NULL; | |
5461b305 | 4380 | break; |
5e16da05 | 4381 | } |
9f19cc17 | 4382 | case LTTNG_LIST_DOMAINS: |
5e16da05 | 4383 | { |
54d01ffb DG |
4384 | ssize_t nb_dom; |
4385 | struct lttng_domain *domains; | |
5461b305 | 4386 | |
54d01ffb DG |
4387 | nb_dom = cmd_list_domains(cmd_ctx->session, &domains); |
4388 | if (nb_dom < 0) { | |
4389 | ret = -nb_dom; | |
4390 | goto error; | |
ce3d728c | 4391 | } |
520ff687 | 4392 | |
54d01ffb | 4393 | ret = setup_lttng_msg(cmd_ctx, nb_dom * sizeof(struct lttng_domain)); |
5461b305 DG |
4394 | if (ret < 0) { |
4395 | goto setup_error; | |
520ff687 | 4396 | } |
57167058 | 4397 | |
54d01ffb DG |
4398 | /* Copy event list into message payload */ |
4399 | memcpy(cmd_ctx->llm->payload, domains, | |
4400 | nb_dom * sizeof(struct lttng_domain)); | |
4401 | ||
4402 | free(domains); | |
5e16da05 | 4403 | |
5461b305 | 4404 | ret = LTTCOMM_OK; |
5e16da05 MD |
4405 | break; |
4406 | } | |
9f19cc17 | 4407 | case LTTNG_LIST_CHANNELS: |
5e16da05 | 4408 | { |
6775595e | 4409 | int nb_chan; |
54d01ffb DG |
4410 | struct lttng_channel *channels; |
4411 | ||
b551a063 DG |
4412 | nb_chan = cmd_list_channels(cmd_ctx->lsm->domain.type, |
4413 | cmd_ctx->session, &channels); | |
54d01ffb DG |
4414 | if (nb_chan < 0) { |
4415 | ret = -nb_chan; | |
4416 | goto error; | |
5461b305 | 4417 | } |
ca95a216 | 4418 | |
54d01ffb | 4419 | ret = setup_lttng_msg(cmd_ctx, nb_chan * sizeof(struct lttng_channel)); |
5461b305 DG |
4420 | if (ret < 0) { |
4421 | goto setup_error; | |
4422 | } | |
9f19cc17 | 4423 | |
54d01ffb DG |
4424 | /* Copy event list into message payload */ |
4425 | memcpy(cmd_ctx->llm->payload, channels, | |
4426 | nb_chan * sizeof(struct lttng_channel)); | |
4427 | ||
4428 | free(channels); | |
9f19cc17 DG |
4429 | |
4430 | ret = LTTCOMM_OK; | |
5461b305 | 4431 | break; |
5e16da05 | 4432 | } |
9f19cc17 | 4433 | case LTTNG_LIST_EVENTS: |
5e16da05 | 4434 | { |
b551a063 | 4435 | ssize_t nb_event; |
684d34d2 | 4436 | struct lttng_event *events = NULL; |
9f19cc17 | 4437 | |
b551a063 | 4438 | nb_event = cmd_list_events(cmd_ctx->lsm->domain.type, cmd_ctx->session, |
54d01ffb DG |
4439 | cmd_ctx->lsm->u.list.channel_name, &events); |
4440 | if (nb_event < 0) { | |
4441 | ret = -nb_event; | |
4442 | goto error; | |
5461b305 | 4443 | } |
ca95a216 | 4444 | |
54d01ffb | 4445 | ret = setup_lttng_msg(cmd_ctx, nb_event * sizeof(struct lttng_event)); |
5461b305 DG |
4446 | if (ret < 0) { |
4447 | goto setup_error; | |
4448 | } | |
9f19cc17 | 4449 | |
54d01ffb DG |
4450 | /* Copy event list into message payload */ |
4451 | memcpy(cmd_ctx->llm->payload, events, | |
4452 | nb_event * sizeof(struct lttng_event)); | |
9f19cc17 | 4453 | |
54d01ffb | 4454 | free(events); |
9f19cc17 DG |
4455 | |
4456 | ret = LTTCOMM_OK; | |
5461b305 | 4457 | break; |
5e16da05 MD |
4458 | } |
4459 | case LTTNG_LIST_SESSIONS: | |
4460 | { | |
8e0af1b4 | 4461 | unsigned int nr_sessions; |
5461b305 | 4462 | |
8e0af1b4 | 4463 | session_lock_list(); |
730389d9 DG |
4464 | nr_sessions = lttng_sessions_count( |
4465 | LTTNG_SOCK_GET_UID_CRED(&cmd_ctx->creds), | |
4466 | LTTNG_SOCK_GET_GID_CRED(&cmd_ctx->creds)); | |
d32fb093 | 4467 | |
8e0af1b4 | 4468 | ret = setup_lttng_msg(cmd_ctx, sizeof(struct lttng_session) * nr_sessions); |
5461b305 | 4469 | if (ret < 0) { |
54d01ffb | 4470 | session_unlock_list(); |
5461b305 | 4471 | goto setup_error; |
e065084a | 4472 | } |
5e16da05 | 4473 | |
6c9cc2ab | 4474 | /* Filled the session array */ |
8e0af1b4 | 4475 | list_lttng_sessions((struct lttng_session *)(cmd_ctx->llm->payload), |
730389d9 DG |
4476 | LTTNG_SOCK_GET_UID_CRED(&cmd_ctx->creds), |
4477 | LTTNG_SOCK_GET_GID_CRED(&cmd_ctx->creds)); | |
6c9cc2ab | 4478 | |
54d01ffb | 4479 | session_unlock_list(); |
5e16da05 | 4480 | |
5461b305 | 4481 | ret = LTTCOMM_OK; |
5e16da05 MD |
4482 | break; |
4483 | } | |
d0254c7c MD |
4484 | case LTTNG_CALIBRATE: |
4485 | { | |
54d01ffb DG |
4486 | ret = cmd_calibrate(cmd_ctx->lsm->domain.type, |
4487 | &cmd_ctx->lsm->u.calibrate); | |
d0254c7c MD |
4488 | break; |
4489 | } | |
d9800920 DG |
4490 | case LTTNG_REGISTER_CONSUMER: |
4491 | { | |
54d01ffb DG |
4492 | ret = cmd_register_consumer(cmd_ctx->session, cmd_ctx->lsm->domain.type, |
4493 | cmd_ctx->lsm->u.reg.path); | |
d9800920 DG |
4494 | break; |
4495 | } | |
53a80697 MD |
4496 | case LTTNG_SET_FILTER: |
4497 | { | |
4498 | struct lttng_filter_bytecode *bytecode; | |
4499 | ||
4500 | if (cmd_ctx->lsm->u.filter.bytecode_len > 65336) { | |
4501 | ret = LTTCOMM_FILTER_INVAL; | |
4502 | goto error; | |
4503 | } | |
4504 | bytecode = zmalloc(cmd_ctx->lsm->u.filter.bytecode_len); | |
4505 | if (!bytecode) { | |
4506 | ret = LTTCOMM_FILTER_NOMEM; | |
4507 | goto error; | |
4508 | } | |
4509 | /* Receive var. len. data */ | |
4510 | DBG("Receiving var len data from client ..."); | |
4511 | ret = lttcomm_recv_unix_sock(sock, bytecode, | |
4512 | cmd_ctx->lsm->u.filter.bytecode_len); | |
4513 | if (ret <= 0) { | |
4514 | DBG("Nothing recv() from client var len data... continuing"); | |
4515 | *sock_error = 1; | |
4516 | ret = LTTCOMM_FILTER_INVAL; | |
4517 | goto error; | |
4518 | } | |
4519 | ||
4520 | if (bytecode->len + sizeof(*bytecode) | |
4521 | != cmd_ctx->lsm->u.filter.bytecode_len) { | |
4522 | free(bytecode); | |
4523 | ret = LTTCOMM_FILTER_INVAL; | |
4524 | goto error; | |
4525 | } | |
4526 | ||
4527 | ret = cmd_set_filter(cmd_ctx->session, cmd_ctx->lsm->domain.type, | |
4528 | cmd_ctx->lsm->u.filter.channel_name, | |
4529 | cmd_ctx->lsm->u.filter.event_name, | |
4530 | bytecode); | |
4531 | break; | |
4532 | } | |
5e16da05 | 4533 | default: |
5e16da05 | 4534 | ret = LTTCOMM_UND; |
5461b305 | 4535 | break; |
fac6795d DG |
4536 | } |
4537 | ||
5461b305 | 4538 | error: |
5461b305 DG |
4539 | if (cmd_ctx->llm == NULL) { |
4540 | DBG("Missing llm structure. Allocating one."); | |
894be886 | 4541 | if (setup_lttng_msg(cmd_ctx, 0) < 0) { |
5461b305 DG |
4542 | goto setup_error; |
4543 | } | |
4544 | } | |
54d01ffb | 4545 | /* Set return code */ |
5461b305 | 4546 | cmd_ctx->llm->ret_code = ret; |
5461b305 | 4547 | setup_error: |
b5541356 | 4548 | if (cmd_ctx->session) { |
54d01ffb | 4549 | session_unlock(cmd_ctx->session); |
b5541356 | 4550 | } |
256a5576 MD |
4551 | if (need_tracing_session) { |
4552 | session_unlock_list(); | |
4553 | } | |
54d01ffb | 4554 | init_setup_error: |
8028d920 | 4555 | return ret; |
fac6795d DG |
4556 | } |
4557 | ||
1d4b027a | 4558 | /* |
d063d709 DG |
4559 | * This thread manage all clients request using the unix client socket for |
4560 | * communication. | |
1d4b027a DG |
4561 | */ |
4562 | static void *thread_manage_clients(void *data) | |
4563 | { | |
a4b35e07 | 4564 | int sock = -1, ret, i, pollfd; |
53a80697 | 4565 | int sock_error; |
5eb91c98 | 4566 | uint32_t revents, nb_fd; |
273ea72c | 4567 | struct command_ctx *cmd_ctx = NULL; |
5eb91c98 | 4568 | struct lttng_poll_event events; |
1d4b027a DG |
4569 | |
4570 | DBG("[thread] Manage client started"); | |
4571 | ||
f6a9efaa DG |
4572 | rcu_register_thread(); |
4573 | ||
1d4b027a DG |
4574 | ret = lttcomm_listen_unix_sock(client_sock); |
4575 | if (ret < 0) { | |
4576 | goto error; | |
4577 | } | |
4578 | ||
5eb91c98 DG |
4579 | /* |
4580 | * Pass 2 as size here for the thread quit pipe and client_sock. Nothing | |
4581 | * more will be added to this poll set. | |
4582 | */ | |
4583 | ret = create_thread_poll_set(&events, 2); | |
4584 | if (ret < 0) { | |
4585 | goto error; | |
4586 | } | |
273ea72c | 4587 | |
5eb91c98 DG |
4588 | /* Add the application registration socket */ |
4589 | ret = lttng_poll_add(&events, client_sock, LPOLLIN | LPOLLPRI); | |
4590 | if (ret < 0) { | |
4591 | goto error; | |
4592 | } | |
273ea72c | 4593 | |
bbd973c2 DG |
4594 | /* |
4595 | * Notify parent pid that we are ready to accept command for client side. | |
1d4b027a DG |
4596 | */ |
4597 | if (opt_sig_parent) { | |
8db8d1dc | 4598 | kill(ppid, SIGUSR1); |
1d4b027a DG |
4599 | } |
4600 | ||
4601 | while (1) { | |
1d4b027a | 4602 | DBG("Accepting client command ..."); |
273ea72c | 4603 | |
5eb91c98 DG |
4604 | nb_fd = LTTNG_POLL_GETNB(&events); |
4605 | ||
273ea72c | 4606 | /* Inifinite blocking call, waiting for transmission */ |
88f2b785 | 4607 | restart: |
5eb91c98 | 4608 | ret = lttng_poll_wait(&events, -1); |
273ea72c | 4609 | if (ret < 0) { |
88f2b785 MD |
4610 | /* |
4611 | * Restart interrupted system call. | |
4612 | */ | |
4613 | if (errno == EINTR) { | |
4614 | goto restart; | |
4615 | } | |
273ea72c DG |
4616 | goto error; |
4617 | } | |
4618 | ||
5eb91c98 DG |
4619 | for (i = 0; i < nb_fd; i++) { |
4620 | /* Fetch once the poll data */ | |
4621 | revents = LTTNG_POLL_GETEV(&events, i); | |
4622 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
4623 | ||
4624 | /* Thread quit pipe has been closed. Killing thread. */ | |
4625 | ret = check_thread_quit_pipe(pollfd, revents); | |
4626 | if (ret) { | |
4627 | goto error; | |
4628 | } | |
4629 | ||
4630 | /* Event on the registration socket */ | |
4631 | if (pollfd == client_sock) { | |
4632 | if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { | |
4633 | ERR("Client socket poll error"); | |
4634 | goto error; | |
4635 | } | |
4636 | } | |
4637 | } | |
4638 | ||
4639 | DBG("Wait for client response"); | |
4640 | ||
4641 | sock = lttcomm_accept_unix_sock(client_sock); | |
4642 | if (sock < 0) { | |
273ea72c | 4643 | goto error; |
273ea72c DG |
4644 | } |
4645 | ||
be040666 DG |
4646 | /* Set socket option for credentials retrieval */ |
4647 | ret = lttcomm_setsockopt_creds_unix_sock(sock); | |
4648 | if (ret < 0) { | |
4649 | goto error; | |
4650 | } | |
4651 | ||
5eb91c98 | 4652 | /* Allocate context command to process the client request */ |
ba7f0ae5 | 4653 | cmd_ctx = zmalloc(sizeof(struct command_ctx)); |
5eb91c98 | 4654 | if (cmd_ctx == NULL) { |
76d7553f | 4655 | PERROR("zmalloc cmd_ctx"); |
1d4b027a | 4656 | goto error; |
5eb91c98 | 4657 | } |
1d4b027a | 4658 | |
5eb91c98 | 4659 | /* Allocate data buffer for reception */ |
ba7f0ae5 | 4660 | cmd_ctx->lsm = zmalloc(sizeof(struct lttcomm_session_msg)); |
5eb91c98 | 4661 | if (cmd_ctx->lsm == NULL) { |
76d7553f | 4662 | PERROR("zmalloc cmd_ctx->lsm"); |
5eb91c98 DG |
4663 | goto error; |
4664 | } | |
1d4b027a | 4665 | |
5eb91c98 DG |
4666 | cmd_ctx->llm = NULL; |
4667 | cmd_ctx->session = NULL; | |
1d4b027a | 4668 | |
5eb91c98 DG |
4669 | /* |
4670 | * Data is received from the lttng client. The struct | |
4671 | * lttcomm_session_msg (lsm) contains the command and data request of | |
4672 | * the client. | |
4673 | */ | |
4674 | DBG("Receiving data from client ..."); | |
be040666 DG |
4675 | ret = lttcomm_recv_creds_unix_sock(sock, cmd_ctx->lsm, |
4676 | sizeof(struct lttcomm_session_msg), &cmd_ctx->creds); | |
5eb91c98 DG |
4677 | if (ret <= 0) { |
4678 | DBG("Nothing recv() from client... continuing"); | |
76d7553f MD |
4679 | ret = close(sock); |
4680 | if (ret) { | |
4681 | PERROR("close"); | |
4682 | } | |
4683 | sock = -1; | |
a2c0da86 | 4684 | clean_command_ctx(&cmd_ctx); |
5eb91c98 DG |
4685 | continue; |
4686 | } | |
1d4b027a | 4687 | |
5eb91c98 DG |
4688 | // TODO: Validate cmd_ctx including sanity check for |
4689 | // security purpose. | |
f7776ea7 | 4690 | |
f6a9efaa | 4691 | rcu_thread_online(); |
5eb91c98 DG |
4692 | /* |
4693 | * This function dispatch the work to the kernel or userspace tracer | |
4694 | * libs and fill the lttcomm_lttng_msg data structure of all the needed | |
4695 | * informations for the client. The command context struct contains | |
4696 | * everything this function may needs. | |
4697 | */ | |
53a80697 | 4698 | ret = process_client_msg(cmd_ctx, sock, &sock_error); |
f6a9efaa | 4699 | rcu_thread_offline(); |
5eb91c98 | 4700 | if (ret < 0) { |
53a80697 MD |
4701 | if (sock_error) { |
4702 | ret = close(sock); | |
4703 | if (ret) { | |
4704 | PERROR("close"); | |
4705 | } | |
4706 | sock = -1; | |
4707 | } | |
bbd973c2 | 4708 | /* |
5eb91c98 | 4709 | * TODO: Inform client somehow of the fatal error. At |
ba7f0ae5 | 4710 | * this point, ret < 0 means that a zmalloc failed |
53a80697 MD |
4711 | * (ENOMEM). Error detected but still accept |
4712 | * command, unless a socket error has been | |
4713 | * detected. | |
bbd973c2 | 4714 | */ |
bbd973c2 | 4715 | clean_command_ctx(&cmd_ctx); |
5eb91c98 DG |
4716 | continue; |
4717 | } | |
d6e4fca4 | 4718 | |
54d01ffb DG |
4719 | DBG("Sending response (size: %d, retcode: %s)", |
4720 | cmd_ctx->lttng_msg_size, | |
9a745bc7 | 4721 | lttng_strerror(-cmd_ctx->llm->ret_code)); |
54d01ffb | 4722 | ret = send_unix_sock(sock, cmd_ctx->llm, cmd_ctx->lttng_msg_size); |
5eb91c98 DG |
4723 | if (ret < 0) { |
4724 | ERR("Failed to send data back to client"); | |
bbd973c2 | 4725 | } |
1d4b027a | 4726 | |
5eb91c98 | 4727 | /* End of transmission */ |
76d7553f MD |
4728 | ret = close(sock); |
4729 | if (ret) { | |
4730 | PERROR("close"); | |
4731 | } | |
4732 | sock = -1; | |
be040666 DG |
4733 | |
4734 | clean_command_ctx(&cmd_ctx); | |
273ea72c DG |
4735 | } |
4736 | ||
5eb91c98 DG |
4737 | error: |
4738 | DBG("Client thread dying"); | |
273ea72c | 4739 | unlink(client_unix_sock_path); |
76d7553f MD |
4740 | if (client_sock >= 0) { |
4741 | ret = close(client_sock); | |
4742 | if (ret) { | |
4743 | PERROR("close"); | |
4744 | } | |
a4b35e07 MD |
4745 | } |
4746 | if (sock >= 0) { | |
76d7553f MD |
4747 | ret = close(sock); |
4748 | if (ret) { | |
4749 | PERROR("close"); | |
4750 | } | |
a4b35e07 | 4751 | } |
273ea72c | 4752 | |
5eb91c98 | 4753 | lttng_poll_clean(&events); |
a2fb29a5 | 4754 | clean_command_ctx(&cmd_ctx); |
f6a9efaa DG |
4755 | |
4756 | rcu_unregister_thread(); | |
1d4b027a DG |
4757 | return NULL; |
4758 | } | |
4759 | ||
4760 | ||
fac6795d DG |
4761 | /* |
4762 | * usage function on stderr | |
4763 | */ | |
4764 | static void usage(void) | |
4765 | { | |
b716ce68 | 4766 | fprintf(stderr, "Usage: %s OPTIONS\n\nOptions:\n", progname); |
d6f42150 DG |
4767 | fprintf(stderr, " -h, --help Display this usage.\n"); |
4768 | fprintf(stderr, " -c, --client-sock PATH Specify path for the client unix socket\n"); | |
4769 | fprintf(stderr, " -a, --apps-sock PATH Specify path for apps unix socket\n"); | |
4770 | fprintf(stderr, " --kconsumerd-err-sock PATH Specify path for the kernel consumer error socket\n"); | |
4771 | fprintf(stderr, " --kconsumerd-cmd-sock PATH Specify path for the kernel consumer command socket\n"); | |
7753dea8 MD |
4772 | fprintf(stderr, " --ustconsumerd32-err-sock PATH Specify path for the 32-bit UST consumer error socket\n"); |
4773 | fprintf(stderr, " --ustconsumerd64-err-sock PATH Specify path for the 64-bit UST consumer error socket\n"); | |
4774 | fprintf(stderr, " --ustconsumerd32-cmd-sock PATH Specify path for the 32-bit UST consumer command socket\n"); | |
4775 | fprintf(stderr, " --ustconsumerd64-cmd-sock PATH Specify path for the 64-bit UST consumer command socket\n"); | |
ebaeda94 MD |
4776 | fprintf(stderr, " --consumerd32-path PATH Specify path for the 32-bit UST consumer daemon binary\n"); |
4777 | fprintf(stderr, " --consumerd32-libdir PATH Specify path for the 32-bit UST consumer daemon libraries\n"); | |
4778 | fprintf(stderr, " --consumerd64-path PATH Specify path for the 64-bit UST consumer daemon binary\n"); | |
4779 | fprintf(stderr, " --consumerd64-libdir PATH Specify path for the 64-bit UST consumer daemon libraries\n"); | |
d6f42150 DG |
4780 | fprintf(stderr, " -d, --daemonize Start as a daemon.\n"); |
4781 | fprintf(stderr, " -g, --group NAME Specify the tracing group name. (default: tracing)\n"); | |
4782 | fprintf(stderr, " -V, --version Show version number.\n"); | |
4783 | fprintf(stderr, " -S, --sig-parent Send SIGCHLD to parent pid to notify readiness.\n"); | |
4784 | fprintf(stderr, " -q, --quiet No output at all.\n"); | |
4785 | fprintf(stderr, " -v, --verbose Verbose mode. Activate DBG() macro.\n"); | |
3bd1e081 | 4786 | fprintf(stderr, " --verbose-consumer Verbose mode for consumer. Activate DBG() macro.\n"); |
4fba7219 | 4787 | fprintf(stderr, " --no-kernel Disable kernel tracer\n"); |
fac6795d DG |
4788 | } |
4789 | ||
4790 | /* | |
4791 | * daemon argument parsing | |
4792 | */ | |
4793 | static int parse_args(int argc, char **argv) | |
4794 | { | |
4795 | int c; | |
4796 | ||
4797 | static struct option long_options[] = { | |
4798 | { "client-sock", 1, 0, 'c' }, | |
4799 | { "apps-sock", 1, 0, 'a' }, | |
3bd1e081 MD |
4800 | { "kconsumerd-cmd-sock", 1, 0, 'C' }, |
4801 | { "kconsumerd-err-sock", 1, 0, 'E' }, | |
7753dea8 MD |
4802 | { "ustconsumerd32-cmd-sock", 1, 0, 'G' }, |
4803 | { "ustconsumerd32-err-sock", 1, 0, 'H' }, | |
ebaeda94 MD |
4804 | { "ustconsumerd64-cmd-sock", 1, 0, 'D' }, |
4805 | { "ustconsumerd64-err-sock", 1, 0, 'F' }, | |
4806 | { "consumerd32-path", 1, 0, 'u' }, | |
4807 | { "consumerd32-libdir", 1, 0, 'U' }, | |
4808 | { "consumerd64-path", 1, 0, 't' }, | |
4809 | { "consumerd64-libdir", 1, 0, 'T' }, | |
fac6795d | 4810 | { "daemonize", 0, 0, 'd' }, |
5b8719f5 | 4811 | { "sig-parent", 0, 0, 'S' }, |
fac6795d DG |
4812 | { "help", 0, 0, 'h' }, |
4813 | { "group", 1, 0, 'g' }, | |
4814 | { "version", 0, 0, 'V' }, | |
75462a81 | 4815 | { "quiet", 0, 0, 'q' }, |
3f9947db | 4816 | { "verbose", 0, 0, 'v' }, |
3bd1e081 | 4817 | { "verbose-consumer", 0, 0, 'Z' }, |
4fba7219 | 4818 | { "no-kernel", 0, 0, 'N' }, |
fac6795d DG |
4819 | { NULL, 0, 0, 0 } |
4820 | }; | |
4821 | ||
4822 | while (1) { | |
4823 | int option_index = 0; | |
4fba7219 | 4824 | c = getopt_long(argc, argv, "dhqvVSN" "a:c:g:s:C:E:D:F:Z:u:t", |
54d01ffb | 4825 | long_options, &option_index); |
fac6795d DG |
4826 | if (c == -1) { |
4827 | break; | |
4828 | } | |
4829 | ||
4830 | switch (c) { | |
4831 | case 0: | |
4832 | fprintf(stderr, "option %s", long_options[option_index].name); | |
4833 | if (optarg) { | |
4834 | fprintf(stderr, " with arg %s\n", optarg); | |
4835 | } | |
4836 | break; | |
b716ce68 | 4837 | case 'c': |
fac6795d DG |
4838 | snprintf(client_unix_sock_path, PATH_MAX, "%s", optarg); |
4839 | break; | |
4840 | case 'a': | |
4841 | snprintf(apps_unix_sock_path, PATH_MAX, "%s", optarg); | |
4842 | break; | |
4843 | case 'd': | |
4844 | opt_daemon = 1; | |
4845 | break; | |
4846 | case 'g': | |
fb09408a | 4847 | opt_tracing_group = optarg; |
fac6795d DG |
4848 | break; |
4849 | case 'h': | |
4850 | usage(); | |
4851 | exit(EXIT_FAILURE); | |
4852 | case 'V': | |
4853 | fprintf(stdout, "%s\n", VERSION); | |
4854 | exit(EXIT_SUCCESS); | |
5b8719f5 DG |
4855 | case 'S': |
4856 | opt_sig_parent = 1; | |
4857 | break; | |
d6f42150 | 4858 | case 'E': |
3bd1e081 | 4859 | snprintf(kconsumer_data.err_unix_sock_path, PATH_MAX, "%s", optarg); |
d6f42150 DG |
4860 | break; |
4861 | case 'C': | |
3bd1e081 MD |
4862 | snprintf(kconsumer_data.cmd_unix_sock_path, PATH_MAX, "%s", optarg); |
4863 | break; | |
4864 | case 'F': | |
7753dea8 | 4865 | snprintf(ustconsumer64_data.err_unix_sock_path, PATH_MAX, "%s", optarg); |
3bd1e081 MD |
4866 | break; |
4867 | case 'D': | |
7753dea8 MD |
4868 | snprintf(ustconsumer64_data.cmd_unix_sock_path, PATH_MAX, "%s", optarg); |
4869 | break; | |
4870 | case 'H': | |
4871 | snprintf(ustconsumer32_data.err_unix_sock_path, PATH_MAX, "%s", optarg); | |
4872 | break; | |
4873 | case 'G': | |
4874 | snprintf(ustconsumer32_data.cmd_unix_sock_path, PATH_MAX, "%s", optarg); | |
d6f42150 | 4875 | break; |
4fba7219 DG |
4876 | case 'N': |
4877 | opt_no_kernel = 1; | |
4878 | break; | |
75462a81 | 4879 | case 'q': |
97e19046 | 4880 | lttng_opt_quiet = 1; |
75462a81 | 4881 | break; |
3f9947db | 4882 | case 'v': |
53086306 | 4883 | /* Verbose level can increase using multiple -v */ |
97e19046 | 4884 | lttng_opt_verbose += 1; |
3f9947db | 4885 | break; |
31f73cc9 | 4886 | case 'Z': |
3bd1e081 | 4887 | opt_verbose_consumer += 1; |
31f73cc9 | 4888 | break; |
fb09408a | 4889 | case 'u': |
fc7a59ce | 4890 | consumerd32_bin= optarg; |
ebaeda94 MD |
4891 | break; |
4892 | case 'U': | |
4893 | consumerd32_libdir = optarg; | |
7753dea8 MD |
4894 | break; |
4895 | case 't': | |
fc7a59ce | 4896 | consumerd64_bin = optarg; |
ebaeda94 MD |
4897 | break; |
4898 | case 'T': | |
4899 | consumerd64_libdir = optarg; | |
fb09408a | 4900 | break; |
fac6795d DG |
4901 | default: |
4902 | /* Unknown option or other error. | |
4903 | * Error is printed by getopt, just return */ | |
4904 | return -1; | |
4905 | } | |
4906 | } | |
4907 | ||
4908 | return 0; | |
4909 | } | |
4910 | ||
4911 | /* | |
d063d709 | 4912 | * Creates the two needed socket by the daemon. |
d6f42150 DG |
4913 | * apps_sock - The communication socket for all UST apps. |
4914 | * client_sock - The communication of the cli tool (lttng). | |
fac6795d | 4915 | */ |
cf3af59e | 4916 | static int init_daemon_socket(void) |
fac6795d DG |
4917 | { |
4918 | int ret = 0; | |
4919 | mode_t old_umask; | |
4920 | ||
4921 | old_umask = umask(0); | |
4922 | ||
4923 | /* Create client tool unix socket */ | |
d6f42150 DG |
4924 | client_sock = lttcomm_create_unix_sock(client_unix_sock_path); |
4925 | if (client_sock < 0) { | |
4926 | ERR("Create unix sock failed: %s", client_unix_sock_path); | |
fac6795d DG |
4927 | ret = -1; |
4928 | goto end; | |
4929 | } | |
4930 | ||
4931 | /* File permission MUST be 660 */ | |
4932 | ret = chmod(client_unix_sock_path, S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP); | |
4933 | if (ret < 0) { | |
d6f42150 | 4934 | ERR("Set file permissions failed: %s", client_unix_sock_path); |
76d7553f | 4935 | PERROR("chmod"); |
fac6795d DG |
4936 | goto end; |
4937 | } | |
4938 | ||
4939 | /* Create the application unix socket */ | |
d6f42150 DG |
4940 | apps_sock = lttcomm_create_unix_sock(apps_unix_sock_path); |
4941 | if (apps_sock < 0) { | |
4942 | ERR("Create unix sock failed: %s", apps_unix_sock_path); | |
fac6795d DG |
4943 | ret = -1; |
4944 | goto end; | |
4945 | } | |
4946 | ||
d6f42150 | 4947 | /* File permission MUST be 666 */ |
54d01ffb DG |
4948 | ret = chmod(apps_unix_sock_path, |
4949 | S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IROTH | S_IWOTH); | |
fac6795d | 4950 | if (ret < 0) { |
d6f42150 | 4951 | ERR("Set file permissions failed: %s", apps_unix_sock_path); |
76d7553f | 4952 | PERROR("chmod"); |
fac6795d DG |
4953 | goto end; |
4954 | } | |
4955 | ||
4956 | end: | |
4957 | umask(old_umask); | |
4958 | return ret; | |
4959 | } | |
4960 | ||
4961 | /* | |
54d01ffb DG |
4962 | * Check if the global socket is available, and if a daemon is answering at the |
4963 | * other side. If yes, error is returned. | |
fac6795d | 4964 | */ |
cf3af59e | 4965 | static int check_existing_daemon(void) |
fac6795d | 4966 | { |
7d8234d9 | 4967 | /* Is there anybody out there ? */ |
099e26bd | 4968 | if (lttng_session_daemon_alive()) { |
7d8234d9 | 4969 | return -EEXIST; |
099e26bd | 4970 | } |
b09c7c76 DG |
4971 | |
4972 | return 0; | |
fac6795d DG |
4973 | } |
4974 | ||
fac6795d | 4975 | /* |
d063d709 | 4976 | * Set the tracing group gid onto the client socket. |
5e16da05 | 4977 | * |
d063d709 | 4978 | * Race window between mkdir and chown is OK because we are going from more |
d1613cf5 | 4979 | * permissive (root.root) to less permissive (root.tracing). |
fac6795d | 4980 | */ |
be040666 | 4981 | static int set_permissions(char *rundir) |
fac6795d DG |
4982 | { |
4983 | int ret; | |
996b65c8 | 4984 | gid_t gid; |
fac6795d | 4985 | |
6775595e DG |
4986 | ret = allowed_group(); |
4987 | if (ret < 0) { | |
be040666 DG |
4988 | WARN("No tracing group detected"); |
4989 | ret = 0; | |
fac6795d DG |
4990 | goto end; |
4991 | } | |
4992 | ||
6775595e DG |
4993 | gid = ret; |
4994 | ||
d6f42150 | 4995 | /* Set lttng run dir */ |
be040666 | 4996 | ret = chown(rundir, 0, gid); |
d6f42150 | 4997 | if (ret < 0) { |
be040666 | 4998 | ERR("Unable to set group on %s", rundir); |
76d7553f | 4999 | PERROR("chown"); |
d6f42150 DG |
5000 | } |
5001 | ||
d1613cf5 | 5002 | /* Ensure tracing group can search the run dir */ |
61076f74 | 5003 | ret = chmod(rundir, S_IRWXU | S_IXGRP | S_IXOTH); |
d1613cf5 JN |
5004 | if (ret < 0) { |
5005 | ERR("Unable to set permissions on %s", rundir); | |
76d7553f | 5006 | PERROR("chmod"); |
d1613cf5 JN |
5007 | } |
5008 | ||
d6f42150 | 5009 | /* lttng client socket path */ |
996b65c8 | 5010 | ret = chown(client_unix_sock_path, 0, gid); |
fac6795d | 5011 | if (ret < 0) { |
d6f42150 | 5012 | ERR("Unable to set group on %s", client_unix_sock_path); |
76d7553f | 5013 | PERROR("chown"); |
d6f42150 DG |
5014 | } |
5015 | ||
3bd1e081 MD |
5016 | /* kconsumer error socket path */ |
5017 | ret = chown(kconsumer_data.err_unix_sock_path, 0, gid); | |
d6f42150 | 5018 | if (ret < 0) { |
3bd1e081 | 5019 | ERR("Unable to set group on %s", kconsumer_data.err_unix_sock_path); |
76d7553f | 5020 | PERROR("chown"); |
3bd1e081 MD |
5021 | } |
5022 | ||
7753dea8 MD |
5023 | /* 64-bit ustconsumer error socket path */ |
5024 | ret = chown(ustconsumer64_data.err_unix_sock_path, 0, gid); | |
5025 | if (ret < 0) { | |
5026 | ERR("Unable to set group on %s", ustconsumer64_data.err_unix_sock_path); | |
76d7553f | 5027 | PERROR("chown"); |
7753dea8 MD |
5028 | } |
5029 | ||
5030 | /* 32-bit ustconsumer compat32 error socket path */ | |
5031 | ret = chown(ustconsumer32_data.err_unix_sock_path, 0, gid); | |
3bd1e081 | 5032 | if (ret < 0) { |
7753dea8 | 5033 | ERR("Unable to set group on %s", ustconsumer32_data.err_unix_sock_path); |
76d7553f | 5034 | PERROR("chown"); |
fac6795d DG |
5035 | } |
5036 | ||
d6f42150 | 5037 | DBG("All permissions are set"); |
e07ae692 | 5038 | |
fac6795d DG |
5039 | end: |
5040 | return ret; | |
5041 | } | |
5042 | ||
d6f42150 | 5043 | /* |
d063d709 | 5044 | * Create the lttng run directory needed for all global sockets and pipe. |
d6f42150 | 5045 | */ |
67e40797 | 5046 | static int create_lttng_rundir(const char *rundir) |
d6f42150 DG |
5047 | { |
5048 | int ret; | |
5049 | ||
67e40797 DG |
5050 | DBG3("Creating LTTng run directory: %s", rundir); |
5051 | ||
d1613cf5 | 5052 | ret = mkdir(rundir, S_IRWXU); |
d6f42150 | 5053 | if (ret < 0) { |
b1f11e69 | 5054 | if (errno != EEXIST) { |
67e40797 | 5055 | ERR("Unable to create %s", rundir); |
b1f11e69 DG |
5056 | goto error; |
5057 | } else { | |
5058 | ret = 0; | |
5059 | } | |
d6f42150 DG |
5060 | } |
5061 | ||
5062 | error: | |
5063 | return ret; | |
5064 | } | |
5065 | ||
5066 | /* | |
d063d709 DG |
5067 | * Setup sockets and directory needed by the kconsumerd communication with the |
5068 | * session daemon. | |
d6f42150 | 5069 | */ |
67e40797 DG |
5070 | static int set_consumer_sockets(struct consumer_data *consumer_data, |
5071 | const char *rundir) | |
d6f42150 DG |
5072 | { |
5073 | int ret; | |
67e40797 | 5074 | char path[PATH_MAX]; |
d6f42150 | 5075 | |
67e40797 | 5076 | switch (consumer_data->type) { |
7753dea8 | 5077 | case LTTNG_CONSUMER_KERNEL: |
60922cb0 | 5078 | snprintf(path, PATH_MAX, DEFAULT_KCONSUMERD_PATH, rundir); |
7753dea8 MD |
5079 | break; |
5080 | case LTTNG_CONSUMER64_UST: | |
60922cb0 | 5081 | snprintf(path, PATH_MAX, DEFAULT_USTCONSUMERD64_PATH, rundir); |
7753dea8 MD |
5082 | break; |
5083 | case LTTNG_CONSUMER32_UST: | |
60922cb0 | 5084 | snprintf(path, PATH_MAX, DEFAULT_USTCONSUMERD32_PATH, rundir); |
7753dea8 MD |
5085 | break; |
5086 | default: | |
5087 | ERR("Consumer type unknown"); | |
5088 | ret = -EINVAL; | |
5089 | goto error; | |
d6f42150 DG |
5090 | } |
5091 | ||
67e40797 DG |
5092 | DBG2("Creating consumer directory: %s", path); |
5093 | ||
d1613cf5 | 5094 | ret = mkdir(path, S_IRWXU); |
d6f42150 | 5095 | if (ret < 0) { |
6beb2242 | 5096 | if (errno != EEXIST) { |
f11e84c2 | 5097 | PERROR("mkdir"); |
3bd1e081 | 5098 | ERR("Failed to create %s", path); |
6beb2242 DG |
5099 | goto error; |
5100 | } | |
f11e84c2 | 5101 | ret = -1; |
d6f42150 DG |
5102 | } |
5103 | ||
5104 | /* Create the kconsumerd error unix socket */ | |
3bd1e081 MD |
5105 | consumer_data->err_sock = |
5106 | lttcomm_create_unix_sock(consumer_data->err_unix_sock_path); | |
5107 | if (consumer_data->err_sock < 0) { | |
5108 | ERR("Create unix sock failed: %s", consumer_data->err_unix_sock_path); | |
d6f42150 DG |
5109 | ret = -1; |
5110 | goto error; | |
5111 | } | |
5112 | ||
5113 | /* File permission MUST be 660 */ | |
3bd1e081 | 5114 | ret = chmod(consumer_data->err_unix_sock_path, |
54d01ffb | 5115 | S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP); |
d6f42150 | 5116 | if (ret < 0) { |
3bd1e081 | 5117 | ERR("Set file permissions failed: %s", consumer_data->err_unix_sock_path); |
67e40797 | 5118 | PERROR("chmod"); |
d6f42150 DG |
5119 | goto error; |
5120 | } | |
5121 | ||
5122 | error: | |
5123 | return ret; | |
5124 | } | |
5125 | ||
fac6795d | 5126 | /* |
d063d709 | 5127 | * Signal handler for the daemon |
cf3af59e | 5128 | * |
54d01ffb DG |
5129 | * Simply stop all worker threads, leaving main() return gracefully after |
5130 | * joining all threads and calling cleanup(). | |
fac6795d DG |
5131 | */ |
5132 | static void sighandler(int sig) | |
5133 | { | |
5134 | switch (sig) { | |
cf3af59e | 5135 | case SIGPIPE: |
af87c45a | 5136 | DBG("SIGPIPE caught"); |
cf3af59e MD |
5137 | return; |
5138 | case SIGINT: | |
af87c45a | 5139 | DBG("SIGINT caught"); |
cf3af59e MD |
5140 | stop_threads(); |
5141 | break; | |
5142 | case SIGTERM: | |
af87c45a | 5143 | DBG("SIGTERM caught"); |
cf3af59e MD |
5144 | stop_threads(); |
5145 | break; | |
5146 | default: | |
5147 | break; | |
fac6795d | 5148 | } |
fac6795d DG |
5149 | } |
5150 | ||
5151 | /* | |
d063d709 | 5152 | * Setup signal handler for : |
1d4b027a | 5153 | * SIGINT, SIGTERM, SIGPIPE |
fac6795d | 5154 | */ |
1d4b027a | 5155 | static int set_signal_handler(void) |
fac6795d | 5156 | { |
1d4b027a DG |
5157 | int ret = 0; |
5158 | struct sigaction sa; | |
5159 | sigset_t sigset; | |
fac6795d | 5160 | |
1d4b027a | 5161 | if ((ret = sigemptyset(&sigset)) < 0) { |
76d7553f | 5162 | PERROR("sigemptyset"); |
1d4b027a DG |
5163 | return ret; |
5164 | } | |
d6f42150 | 5165 | |
1d4b027a DG |
5166 | sa.sa_handler = sighandler; |
5167 | sa.sa_mask = sigset; | |
5168 | sa.sa_flags = 0; | |
5169 | if ((ret = sigaction(SIGTERM, &sa, NULL)) < 0) { | |
76d7553f | 5170 | PERROR("sigaction"); |
1d4b027a | 5171 | return ret; |
d6f42150 DG |
5172 | } |
5173 | ||
1d4b027a | 5174 | if ((ret = sigaction(SIGINT, &sa, NULL)) < 0) { |
76d7553f | 5175 | PERROR("sigaction"); |
1d4b027a | 5176 | return ret; |
d6f42150 | 5177 | } |
aaf26714 | 5178 | |
1d4b027a | 5179 | if ((ret = sigaction(SIGPIPE, &sa, NULL)) < 0) { |
76d7553f | 5180 | PERROR("sigaction"); |
1d4b027a | 5181 | return ret; |
8c0faa1d DG |
5182 | } |
5183 | ||
1d4b027a DG |
5184 | DBG("Signal handler set for SIGTERM, SIGPIPE and SIGINT"); |
5185 | ||
5186 | return ret; | |
fac6795d DG |
5187 | } |
5188 | ||
f3ed775e | 5189 | /* |
d063d709 DG |
5190 | * Set open files limit to unlimited. This daemon can open a large number of |
5191 | * file descriptors in order to consumer multiple kernel traces. | |
f3ed775e DG |
5192 | */ |
5193 | static void set_ulimit(void) | |
5194 | { | |
5195 | int ret; | |
5196 | struct rlimit lim; | |
5197 | ||
a88df331 | 5198 | /* The kernel does not allowed an infinite limit for open files */ |
f3ed775e DG |
5199 | lim.rlim_cur = 65535; |
5200 | lim.rlim_max = 65535; | |
5201 | ||
5202 | ret = setrlimit(RLIMIT_NOFILE, &lim); | |
5203 | if (ret < 0) { | |
76d7553f | 5204 | PERROR("failed to set open files limit"); |
f3ed775e DG |
5205 | } |
5206 | } | |
5207 | ||
fac6795d DG |
5208 | /* |
5209 | * main | |
5210 | */ | |
5211 | int main(int argc, char **argv) | |
5212 | { | |
fac6795d DG |
5213 | int ret = 0; |
5214 | void *status; | |
b082db07 | 5215 | const char *home_path; |
fac6795d | 5216 | |
335a95b7 MD |
5217 | init_kernel_workarounds(); |
5218 | ||
f6a9efaa DG |
5219 | rcu_register_thread(); |
5220 | ||
7753dea8 | 5221 | setup_consumerd_path(); |
fb09408a | 5222 | |
fac6795d DG |
5223 | /* Parse arguments */ |
5224 | progname = argv[0]; | |
5225 | if ((ret = parse_args(argc, argv) < 0)) { | |
cf3af59e | 5226 | goto error; |
fac6795d DG |
5227 | } |
5228 | ||
5229 | /* Daemonize */ | |
5230 | if (opt_daemon) { | |
ceed52b5 MD |
5231 | int i; |
5232 | ||
5233 | /* | |
5234 | * fork | |
5235 | * child: setsid, close FD 0, 1, 2, chdir / | |
5236 | * parent: exit (if fork is successful) | |
5237 | */ | |
53094c05 DG |
5238 | ret = daemon(0, 0); |
5239 | if (ret < 0) { | |
76d7553f | 5240 | PERROR("daemon"); |
cf3af59e | 5241 | goto error; |
53094c05 | 5242 | } |
ceed52b5 MD |
5243 | /* |
5244 | * We are in the child. Make sure all other file | |
5245 | * descriptors are closed, in case we are called with | |
5246 | * more opened file descriptors than the standard ones. | |
5247 | */ | |
5248 | for (i = 3; i < sysconf(_SC_OPEN_MAX); i++) { | |
5249 | (void) close(i); | |
5250 | } | |
5251 | } | |
5252 | ||
5253 | /* Create thread quit pipe */ | |
5254 | if ((ret = init_thread_quit_pipe()) < 0) { | |
5255 | goto error; | |
fac6795d DG |
5256 | } |
5257 | ||
5258 | /* Check if daemon is UID = 0 */ | |
5259 | is_root = !getuid(); | |
5260 | ||
fac6795d | 5261 | if (is_root) { |
990570ed | 5262 | rundir = strdup(DEFAULT_LTTNG_RUNDIR); |
67e40797 DG |
5263 | |
5264 | /* Create global run dir with root access */ | |
5265 | ret = create_lttng_rundir(rundir); | |
d6f42150 | 5266 | if (ret < 0) { |
cf3af59e | 5267 | goto error; |
d6f42150 DG |
5268 | } |
5269 | ||
fac6795d | 5270 | if (strlen(apps_unix_sock_path) == 0) { |
d6f42150 DG |
5271 | snprintf(apps_unix_sock_path, PATH_MAX, |
5272 | DEFAULT_GLOBAL_APPS_UNIX_SOCK); | |
fac6795d DG |
5273 | } |
5274 | ||
5275 | if (strlen(client_unix_sock_path) == 0) { | |
d6f42150 DG |
5276 | snprintf(client_unix_sock_path, PATH_MAX, |
5277 | DEFAULT_GLOBAL_CLIENT_UNIX_SOCK); | |
5278 | } | |
0fdd1e2c DG |
5279 | |
5280 | /* Set global SHM for ust */ | |
5281 | if (strlen(wait_shm_path) == 0) { | |
5282 | snprintf(wait_shm_path, PATH_MAX, | |
5283 | DEFAULT_GLOBAL_APPS_WAIT_SHM_PATH); | |
5284 | } | |
67e40797 DG |
5285 | |
5286 | /* Setup kernel consumerd path */ | |
5287 | snprintf(kconsumer_data.err_unix_sock_path, PATH_MAX, | |
60922cb0 | 5288 | DEFAULT_KCONSUMERD_ERR_SOCK_PATH, rundir); |
67e40797 | 5289 | snprintf(kconsumer_data.cmd_unix_sock_path, PATH_MAX, |
60922cb0 | 5290 | DEFAULT_KCONSUMERD_CMD_SOCK_PATH, rundir); |
67e40797 DG |
5291 | |
5292 | DBG2("Kernel consumer err path: %s", | |
5293 | kconsumer_data.err_unix_sock_path); | |
5294 | DBG2("Kernel consumer cmd path: %s", | |
5295 | kconsumer_data.cmd_unix_sock_path); | |
fac6795d | 5296 | } else { |
b082db07 DG |
5297 | home_path = get_home_dir(); |
5298 | if (home_path == NULL) { | |
273ea72c DG |
5299 | /* TODO: Add --socket PATH option */ |
5300 | ERR("Can't get HOME directory for sockets creation."); | |
cf3af59e MD |
5301 | ret = -EPERM; |
5302 | goto error; | |
b082db07 DG |
5303 | } |
5304 | ||
67e40797 DG |
5305 | /* |
5306 | * Create rundir from home path. This will create something like | |
5307 | * $HOME/.lttng | |
5308 | */ | |
990570ed | 5309 | ret = asprintf(&rundir, DEFAULT_LTTNG_HOME_RUNDIR, home_path); |
67e40797 DG |
5310 | if (ret < 0) { |
5311 | ret = -ENOMEM; | |
5312 | goto error; | |
5313 | } | |
5314 | ||
5315 | ret = create_lttng_rundir(rundir); | |
5316 | if (ret < 0) { | |
5317 | goto error; | |
5318 | } | |
5319 | ||
fac6795d | 5320 | if (strlen(apps_unix_sock_path) == 0) { |
d6f42150 | 5321 | snprintf(apps_unix_sock_path, PATH_MAX, |
b082db07 | 5322 | DEFAULT_HOME_APPS_UNIX_SOCK, home_path); |
fac6795d DG |
5323 | } |
5324 | ||
5325 | /* Set the cli tool unix socket path */ | |
5326 | if (strlen(client_unix_sock_path) == 0) { | |
d6f42150 | 5327 | snprintf(client_unix_sock_path, PATH_MAX, |
b082db07 | 5328 | DEFAULT_HOME_CLIENT_UNIX_SOCK, home_path); |
fac6795d | 5329 | } |
0fdd1e2c DG |
5330 | |
5331 | /* Set global SHM for ust */ | |
5332 | if (strlen(wait_shm_path) == 0) { | |
5333 | snprintf(wait_shm_path, PATH_MAX, | |
5334 | DEFAULT_HOME_APPS_WAIT_SHM_PATH, geteuid()); | |
5335 | } | |
fac6795d DG |
5336 | } |
5337 | ||
5c827ce0 DG |
5338 | /* Set consumer initial state */ |
5339 | kernel_consumerd_state = CONSUMER_STOPPED; | |
5340 | ust_consumerd_state = CONSUMER_STOPPED; | |
5341 | ||
847177cd DG |
5342 | DBG("Client socket path %s", client_unix_sock_path); |
5343 | DBG("Application socket path %s", apps_unix_sock_path); | |
67e40797 DG |
5344 | DBG("LTTng run directory path: %s", rundir); |
5345 | ||
5346 | /* 32 bits consumerd path setup */ | |
5347 | snprintf(ustconsumer32_data.err_unix_sock_path, PATH_MAX, | |
60922cb0 | 5348 | DEFAULT_USTCONSUMERD32_ERR_SOCK_PATH, rundir); |
67e40797 | 5349 | snprintf(ustconsumer32_data.cmd_unix_sock_path, PATH_MAX, |
60922cb0 | 5350 | DEFAULT_USTCONSUMERD32_CMD_SOCK_PATH, rundir); |
67e40797 DG |
5351 | |
5352 | DBG2("UST consumer 32 bits err path: %s", | |
5353 | ustconsumer32_data.err_unix_sock_path); | |
5354 | DBG2("UST consumer 32 bits cmd path: %s", | |
5355 | ustconsumer32_data.cmd_unix_sock_path); | |
5356 | ||
5357 | /* 64 bits consumerd path setup */ | |
5358 | snprintf(ustconsumer64_data.err_unix_sock_path, PATH_MAX, | |
60922cb0 | 5359 | DEFAULT_USTCONSUMERD64_ERR_SOCK_PATH, rundir); |
67e40797 | 5360 | snprintf(ustconsumer64_data.cmd_unix_sock_path, PATH_MAX, |
60922cb0 | 5361 | DEFAULT_USTCONSUMERD64_CMD_SOCK_PATH, rundir); |
67e40797 DG |
5362 | |
5363 | DBG2("UST consumer 64 bits err path: %s", | |
5364 | ustconsumer64_data.err_unix_sock_path); | |
5365 | DBG2("UST consumer 64 bits cmd path: %s", | |
5366 | ustconsumer64_data.cmd_unix_sock_path); | |
847177cd | 5367 | |
273ea72c | 5368 | /* |
7d8234d9 | 5369 | * See if daemon already exist. |
fac6795d | 5370 | */ |
7d8234d9 | 5371 | if ((ret = check_existing_daemon()) < 0) { |
75462a81 | 5372 | ERR("Already running daemon.\n"); |
273ea72c | 5373 | /* |
cf3af59e MD |
5374 | * We do not goto exit because we must not cleanup() |
5375 | * because a daemon is already running. | |
ab118b20 | 5376 | */ |
cf3af59e | 5377 | goto error; |
a88df331 DG |
5378 | } |
5379 | ||
1427f9b2 DG |
5380 | /* |
5381 | * Init UST app hash table. Alloc hash table before this point since | |
5382 | * cleanup() can get called after that point. | |
5383 | */ | |
5384 | ust_app_ht_alloc(); | |
5385 | ||
54d01ffb | 5386 | /* After this point, we can safely call cleanup() with "goto exit" */ |
a88df331 DG |
5387 | |
5388 | /* | |
5389 | * These actions must be executed as root. We do that *after* setting up | |
5390 | * the sockets path because we MUST make the check for another daemon using | |
5391 | * those paths *before* trying to set the kernel consumer sockets and init | |
5392 | * kernel tracer. | |
5393 | */ | |
5394 | if (is_root) { | |
67e40797 | 5395 | ret = set_consumer_sockets(&kconsumer_data, rundir); |
7753dea8 MD |
5396 | if (ret < 0) { |
5397 | goto exit; | |
5398 | } | |
5399 | ||
a88df331 | 5400 | /* Setup kernel tracer */ |
4fba7219 DG |
5401 | if (!opt_no_kernel) { |
5402 | init_kernel_tracer(); | |
5403 | } | |
a88df331 DG |
5404 | |
5405 | /* Set ulimit for open files */ | |
5406 | set_ulimit(); | |
fac6795d | 5407 | } |
4063050c MD |
5408 | /* init lttng_fd tracking must be done after set_ulimit. */ |
5409 | lttng_fd_init(); | |
fac6795d | 5410 | |
67e40797 DG |
5411 | ret = set_consumer_sockets(&ustconsumer64_data, rundir); |
5412 | if (ret < 0) { | |
5413 | goto exit; | |
5414 | } | |
5415 | ||
5416 | ret = set_consumer_sockets(&ustconsumer32_data, rundir); | |
5417 | if (ret < 0) { | |
5418 | goto exit; | |
5419 | } | |
5420 | ||
cf3af59e MD |
5421 | if ((ret = set_signal_handler()) < 0) { |
5422 | goto exit; | |
fac6795d DG |
5423 | } |
5424 | ||
d6f42150 | 5425 | /* Setup the needed unix socket */ |
cf3af59e MD |
5426 | if ((ret = init_daemon_socket()) < 0) { |
5427 | goto exit; | |
fac6795d DG |
5428 | } |
5429 | ||
5430 | /* Set credentials to socket */ | |
be040666 | 5431 | if (is_root && ((ret = set_permissions(rundir)) < 0)) { |
cf3af59e | 5432 | goto exit; |
fac6795d DG |
5433 | } |
5434 | ||
5b8719f5 DG |
5435 | /* Get parent pid if -S, --sig-parent is specified. */ |
5436 | if (opt_sig_parent) { | |
5437 | ppid = getppid(); | |
5438 | } | |
5439 | ||
7a485870 | 5440 | /* Setup the kernel pipe for waking up the kernel thread */ |
ef599319 | 5441 | if ((ret = utils_create_pipe_cloexec(kernel_poll_pipe)) < 0) { |
cf3af59e | 5442 | goto exit; |
7a485870 DG |
5443 | } |
5444 | ||
099e26bd | 5445 | /* Setup the thread apps communication pipe. */ |
ef599319 | 5446 | if ((ret = utils_create_pipe_cloexec(apps_cmd_pipe)) < 0) { |
099e26bd DG |
5447 | goto exit; |
5448 | } | |
5449 | ||
5450 | /* Init UST command queue. */ | |
5451 | cds_wfq_init(&ust_cmd_queue.queue); | |
5452 | ||
273ea72c | 5453 | /* |
54d01ffb DG |
5454 | * Get session list pointer. This pointer MUST NOT be free(). This list is |
5455 | * statically declared in session.c | |
273ea72c | 5456 | */ |
54d01ffb | 5457 | session_list_ptr = session_get_list(); |
b5541356 | 5458 | |
5eb91c98 DG |
5459 | /* Set up max poll set size */ |
5460 | lttng_poll_set_max_size(); | |
5461 | ||
00e2e675 DG |
5462 | /* |
5463 | * Set network sequence index to 1 for streams to match a relayd socket on | |
5464 | * the consumer side. | |
5465 | */ | |
5466 | uatomic_set(&relayd_net_seq_idx, 1); | |
5467 | ||
cf3af59e | 5468 | /* Create thread to manage the client socket */ |
099e26bd DG |
5469 | ret = pthread_create(&client_thread, NULL, |
5470 | thread_manage_clients, (void *) NULL); | |
cf3af59e | 5471 | if (ret != 0) { |
76d7553f | 5472 | PERROR("pthread_create clients"); |
cf3af59e MD |
5473 | goto exit_client; |
5474 | } | |
fac6795d | 5475 | |
099e26bd DG |
5476 | /* Create thread to dispatch registration */ |
5477 | ret = pthread_create(&dispatch_thread, NULL, | |
5478 | thread_dispatch_ust_registration, (void *) NULL); | |
5479 | if (ret != 0) { | |
76d7553f | 5480 | PERROR("pthread_create dispatch"); |
099e26bd DG |
5481 | goto exit_dispatch; |
5482 | } | |
5483 | ||
5484 | /* Create thread to manage application registration. */ | |
5485 | ret = pthread_create(®_apps_thread, NULL, | |
5486 | thread_registration_apps, (void *) NULL); | |
5487 | if (ret != 0) { | |
76d7553f | 5488 | PERROR("pthread_create registration"); |
099e26bd DG |
5489 | goto exit_reg_apps; |
5490 | } | |
5491 | ||
cf3af59e | 5492 | /* Create thread to manage application socket */ |
54d01ffb DG |
5493 | ret = pthread_create(&apps_thread, NULL, |
5494 | thread_manage_apps, (void *) NULL); | |
cf3af59e | 5495 | if (ret != 0) { |
76d7553f | 5496 | PERROR("pthread_create apps"); |
cf3af59e MD |
5497 | goto exit_apps; |
5498 | } | |
fac6795d | 5499 | |
cf3af59e | 5500 | /* Create kernel thread to manage kernel event */ |
54d01ffb DG |
5501 | ret = pthread_create(&kernel_thread, NULL, |
5502 | thread_manage_kernel, (void *) NULL); | |
cf3af59e | 5503 | if (ret != 0) { |
76d7553f | 5504 | PERROR("pthread_create kernel"); |
cf3af59e MD |
5505 | goto exit_kernel; |
5506 | } | |
7a485870 | 5507 | |
cf3af59e MD |
5508 | ret = pthread_join(kernel_thread, &status); |
5509 | if (ret != 0) { | |
76d7553f | 5510 | PERROR("pthread_join"); |
cf3af59e | 5511 | goto error; /* join error, exit without cleanup */ |
fac6795d DG |
5512 | } |
5513 | ||
cf3af59e MD |
5514 | exit_kernel: |
5515 | ret = pthread_join(apps_thread, &status); | |
5516 | if (ret != 0) { | |
76d7553f | 5517 | PERROR("pthread_join"); |
cf3af59e MD |
5518 | goto error; /* join error, exit without cleanup */ |
5519 | } | |
fac6795d | 5520 | |
cf3af59e | 5521 | exit_apps: |
099e26bd DG |
5522 | ret = pthread_join(reg_apps_thread, &status); |
5523 | if (ret != 0) { | |
76d7553f | 5524 | PERROR("pthread_join"); |
099e26bd DG |
5525 | goto error; /* join error, exit without cleanup */ |
5526 | } | |
5527 | ||
5528 | exit_reg_apps: | |
5529 | ret = pthread_join(dispatch_thread, &status); | |
5530 | if (ret != 0) { | |
76d7553f | 5531 | PERROR("pthread_join"); |
099e26bd DG |
5532 | goto error; /* join error, exit without cleanup */ |
5533 | } | |
5534 | ||
5535 | exit_dispatch: | |
cf3af59e MD |
5536 | ret = pthread_join(client_thread, &status); |
5537 | if (ret != 0) { | |
76d7553f | 5538 | PERROR("pthread_join"); |
cf3af59e MD |
5539 | goto error; /* join error, exit without cleanup */ |
5540 | } | |
5541 | ||
3bd1e081 | 5542 | ret = join_consumer_thread(&kconsumer_data); |
cf3af59e | 5543 | if (ret != 0) { |
76d7553f | 5544 | PERROR("join_consumer"); |
cf3af59e MD |
5545 | goto error; /* join error, exit without cleanup */ |
5546 | } | |
a88df331 | 5547 | |
cf3af59e | 5548 | exit_client: |
a88df331 | 5549 | exit: |
cf3af59e MD |
5550 | /* |
5551 | * cleanup() is called when no other thread is running. | |
5552 | */ | |
f6a9efaa | 5553 | rcu_thread_online(); |
cf3af59e | 5554 | cleanup(); |
f6a9efaa DG |
5555 | rcu_thread_offline(); |
5556 | rcu_unregister_thread(); | |
67e40797 | 5557 | if (!ret) { |
cf3af59e | 5558 | exit(EXIT_SUCCESS); |
67e40797 | 5559 | } |
cf3af59e | 5560 | error: |
5e16da05 | 5561 | exit(EXIT_FAILURE); |
fac6795d | 5562 | } |