Commit | Line | Data |
---|---|---|
826d496d MD |
1 | /* |
2 | * Copyright (C) 2011 - David Goulet <david.goulet@polymtl.ca> | |
0fdd1e2c | 3 | * Mathieu Desnoyers <mathieu.desnoyers@efficios.com> |
fac6795d | 4 | * |
54d01ffb DG |
5 | * This program is free software; you can redistribute it and/or modify it |
6 | * under the terms of the GNU General Public License as published by the Free | |
7 | * Software Foundation; only version 2 of the License. | |
91d76f53 | 8 | * |
54d01ffb DG |
9 | * This program is distributed in the hope that it will be useful, but WITHOUT |
10 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
11 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for | |
12 | * more details. | |
91d76f53 | 13 | * |
54d01ffb DG |
14 | * You should have received a copy of the GNU General Public License along with |
15 | * this program; if not, write to the Free Software Foundation, Inc., 59 Temple | |
16 | * Place - Suite 330, Boston, MA 02111-1307, USA. | |
fac6795d DG |
17 | */ |
18 | ||
19 | #define _GNU_SOURCE | |
ca4537d3 | 20 | #include <fcntl.h> |
fac6795d DG |
21 | #include <getopt.h> |
22 | #include <grp.h> | |
23 | #include <limits.h> | |
24 | #include <pthread.h> | |
8c0faa1d | 25 | #include <semaphore.h> |
fac6795d DG |
26 | #include <signal.h> |
27 | #include <stdio.h> | |
28 | #include <stdlib.h> | |
29 | #include <string.h> | |
0fdd1e2c | 30 | #include <sys/mman.h> |
b73401da | 31 | #include <sys/mount.h> |
1e307fab | 32 | #include <sys/resource.h> |
fac6795d DG |
33 | #include <sys/socket.h> |
34 | #include <sys/stat.h> | |
35 | #include <sys/types.h> | |
0fdd1e2c DG |
36 | #include <sys/wait.h> |
37 | #include <urcu/futex.h> | |
fac6795d | 38 | #include <unistd.h> |
3bd1e081 | 39 | #include <config.h> |
fac6795d | 40 | |
990570ed | 41 | #include <common/common.h> |
0ba98ebc | 42 | #include <common/compat/poll.h> |
db758600 DG |
43 | #include <common/defaults.h> |
44 | #include <common/kernel-consumer/kernel-consumer.h> | |
45 | #include <common/ust-consumer/ust-consumer.h> | |
fac6795d | 46 | |
10a8a223 | 47 | #include "lttng-sessiond.h" |
54d01ffb | 48 | #include "channel.h" |
099e26bd | 49 | #include "context.h" |
54d01ffb | 50 | #include "event.h" |
099e26bd | 51 | #include "futex.h" |
4771f025 | 52 | #include "kernel.h" |
096102bd | 53 | #include "modprobe.h" |
0fdd1e2c | 54 | #include "shm.h" |
1e307fab | 55 | #include "ust-ctl.h" |
8e68d1c8 | 56 | #include "utils.h" |
fac6795d | 57 | |
ebaeda94 MD |
58 | #define CONSUMERD_FILE "lttng-consumerd" |
59 | ||
3bd1e081 MD |
60 | struct consumer_data { |
61 | enum lttng_consumer_type type; | |
62 | ||
63 | pthread_t thread; /* Worker thread interacting with the consumer */ | |
64 | sem_t sem; | |
65 | ||
66 | /* Mutex to control consumerd pid assignation */ | |
67 | pthread_mutex_t pid_mutex; | |
68 | pid_t pid; | |
69 | ||
70 | int err_sock; | |
71 | int cmd_sock; | |
72 | ||
73 | /* consumer error and command Unix socket path */ | |
74 | char err_unix_sock_path[PATH_MAX]; | |
75 | char cmd_unix_sock_path[PATH_MAX]; | |
76 | }; | |
77 | ||
75462a81 | 78 | /* Const values */ |
686204ab | 79 | const char default_home_dir[] = DEFAULT_HOME_DIR; |
bbccc3d2 | 80 | const char default_tracing_group[] = DEFAULT_TRACING_GROUP; |
686204ab MD |
81 | const char default_ust_sock_dir[] = DEFAULT_UST_SOCK_DIR; |
82 | const char default_global_apps_pipe[] = DEFAULT_GLOBAL_APPS_PIPE; | |
83 | ||
fac6795d | 84 | /* Variables */ |
1d4b027a | 85 | int opt_verbose; /* Not static for lttngerr.h */ |
3bd1e081 | 86 | int opt_verbose_consumer; /* Not static for lttngerr.h */ |
1d4b027a | 87 | int opt_quiet; /* Not static for lttngerr.h */ |
d063d709 | 88 | |
fac6795d DG |
89 | const char *progname; |
90 | const char *opt_tracing_group; | |
5b8719f5 | 91 | static int opt_sig_parent; |
fac6795d | 92 | static int opt_daemon; |
4fba7219 | 93 | static int opt_no_kernel; |
fac6795d | 94 | static int is_root; /* Set to 1 if the daemon is running as root */ |
1d4b027a | 95 | static pid_t ppid; /* Parent PID for --sig-parent option */ |
67e40797 | 96 | static char *rundir; |
3bd1e081 MD |
97 | |
98 | /* Consumer daemon specific control data */ | |
99 | static struct consumer_data kconsumer_data = { | |
100 | .type = LTTNG_CONSUMER_KERNEL, | |
60922cb0 DG |
101 | .err_unix_sock_path = DEFAULT_KCONSUMERD_ERR_SOCK_PATH, |
102 | .cmd_unix_sock_path = DEFAULT_KCONSUMERD_CMD_SOCK_PATH, | |
3bd1e081 | 103 | }; |
7753dea8 MD |
104 | static struct consumer_data ustconsumer64_data = { |
105 | .type = LTTNG_CONSUMER64_UST, | |
60922cb0 DG |
106 | .err_unix_sock_path = DEFAULT_USTCONSUMERD64_ERR_SOCK_PATH, |
107 | .cmd_unix_sock_path = DEFAULT_USTCONSUMERD64_CMD_SOCK_PATH, | |
7753dea8 MD |
108 | }; |
109 | static struct consumer_data ustconsumer32_data = { | |
110 | .type = LTTNG_CONSUMER32_UST, | |
60922cb0 DG |
111 | .err_unix_sock_path = DEFAULT_USTCONSUMERD32_ERR_SOCK_PATH, |
112 | .cmd_unix_sock_path = DEFAULT_USTCONSUMERD32_CMD_SOCK_PATH, | |
3bd1e081 MD |
113 | }; |
114 | ||
099e26bd | 115 | static int dispatch_thread_exit; |
fac6795d | 116 | |
54d01ffb DG |
117 | /* Global application Unix socket path */ |
118 | static char apps_unix_sock_path[PATH_MAX]; | |
119 | /* Global client Unix socket path */ | |
120 | static char client_unix_sock_path[PATH_MAX]; | |
54d01ffb DG |
121 | /* global wait shm path for UST */ |
122 | static char wait_shm_path[PATH_MAX]; | |
fac6795d | 123 | |
1d4b027a | 124 | /* Sockets and FDs */ |
a4b35e07 MD |
125 | static int client_sock = -1; |
126 | static int apps_sock = -1; | |
127 | static int kernel_tracer_fd = -1; | |
7a485870 | 128 | static int kernel_poll_pipe[2]; |
1d4b027a | 129 | |
273ea72c DG |
130 | /* |
131 | * Quit pipe for all threads. This permits a single cancellation point | |
132 | * for all threads when receiving an event on the pipe. | |
133 | */ | |
134 | static int thread_quit_pipe[2]; | |
135 | ||
099e26bd DG |
136 | /* |
137 | * This pipe is used to inform the thread managing application communication | |
138 | * that a command is queued and ready to be processed. | |
139 | */ | |
140 | static int apps_cmd_pipe[2]; | |
141 | ||
1d4b027a | 142 | /* Pthread, Mutexes and Semaphores */ |
1d4b027a | 143 | static pthread_t apps_thread; |
099e26bd | 144 | static pthread_t reg_apps_thread; |
1d4b027a | 145 | static pthread_t client_thread; |
7a485870 | 146 | static pthread_t kernel_thread; |
099e26bd | 147 | static pthread_t dispatch_thread; |
5eb91c98 | 148 | |
fac6795d | 149 | |
099e26bd DG |
150 | /* |
151 | * UST registration command queue. This queue is tied with a futex and uses a N | |
152 | * wakers / 1 waiter implemented and detailed in futex.c/.h | |
153 | * | |
154 | * The thread_manage_apps and thread_dispatch_ust_registration interact with | |
155 | * this queue and the wait/wake scheme. | |
156 | */ | |
157 | static struct ust_cmd_queue ust_cmd_queue; | |
158 | ||
b5541356 DG |
159 | /* |
160 | * Pointer initialized before thread creation. | |
161 | * | |
162 | * This points to the tracing session list containing the session count and a | |
163 | * mutex lock. The lock MUST be taken if you iterate over the list. The lock | |
164 | * MUST NOT be taken if you call a public function in session.c. | |
04ea676f | 165 | * |
d063d709 | 166 | * The lock is nested inside the structure: session_list_ptr->lock. Please use |
54d01ffb | 167 | * session_lock_list and session_unlock_list for lock acquisition. |
b5541356 DG |
168 | */ |
169 | static struct ltt_session_list *session_list_ptr; | |
170 | ||
7753dea8 MD |
171 | int ust_consumerd64_fd = -1; |
172 | int ust_consumerd32_fd = -1; | |
173 | ||
fb6f1fa2 YB |
174 | static const char *consumerd32_bin = CONFIG_CONSUMERD32_BIN; |
175 | static const char *consumerd64_bin = CONFIG_CONSUMERD64_BIN; | |
176 | static const char *consumerd32_libdir = CONFIG_CONSUMERD32_LIBDIR; | |
177 | static const char *consumerd64_libdir = CONFIG_CONSUMERD64_LIBDIR; | |
fb09408a MD |
178 | |
179 | static | |
7753dea8 | 180 | void setup_consumerd_path(void) |
fb09408a | 181 | { |
fc7a59ce | 182 | const char *bin, *libdir; |
fb09408a | 183 | |
7753dea8 MD |
184 | /* |
185 | * Allow INSTALL_BIN_PATH to be used as a target path for the | |
ebaeda94 MD |
186 | * native architecture size consumer if CONFIG_CONSUMER*_PATH |
187 | * has not been defined. | |
7753dea8 | 188 | */ |
ebaeda94 | 189 | #if (CAA_BITS_PER_LONG == 32) |
fc7a59ce AM |
190 | if (!consumerd32_bin[0]) { |
191 | consumerd32_bin = INSTALL_BIN_PATH "/" CONSUMERD_FILE; | |
ebaeda94 MD |
192 | } |
193 | if (!consumerd32_libdir[0]) { | |
194 | consumerd32_libdir = INSTALL_LIB_PATH; | |
195 | } | |
196 | #elif (CAA_BITS_PER_LONG == 64) | |
fc7a59ce AM |
197 | if (!consumerd64_bin[0]) { |
198 | consumerd64_bin = INSTALL_BIN_PATH "/" CONSUMERD_FILE; | |
7753dea8 | 199 | } |
ebaeda94 MD |
200 | if (!consumerd64_libdir[0]) { |
201 | consumerd64_libdir = INSTALL_LIB_PATH; | |
7753dea8 MD |
202 | } |
203 | #else | |
204 | #error "Unknown bitness" | |
205 | #endif | |
206 | ||
fb09408a MD |
207 | /* |
208 | * runtime env. var. overrides the build default. | |
209 | */ | |
fc7a59ce AM |
210 | bin = getenv("LTTNG_CONSUMERD32_BIN"); |
211 | if (bin) { | |
212 | consumerd32_bin = bin; | |
7753dea8 | 213 | } |
fc7a59ce AM |
214 | bin = getenv("LTTNG_CONSUMERD64_BIN"); |
215 | if (bin) { | |
216 | consumerd64_bin = bin; | |
ebaeda94 | 217 | } |
72f579ee | 218 | libdir = getenv("LTTNG_CONSUMERD32_LIBDIR"); |
ebaeda94 MD |
219 | if (libdir) { |
220 | consumerd32_libdir = libdir; | |
221 | } | |
72f579ee | 222 | libdir = getenv("LTTNG_CONSUMERD64_LIBDIR"); |
ebaeda94 MD |
223 | if (libdir) { |
224 | consumerd64_libdir = libdir; | |
fb09408a MD |
225 | } |
226 | } | |
227 | ||
5eb91c98 DG |
228 | /* |
229 | * Create a poll set with O_CLOEXEC and add the thread quit pipe to the set. | |
230 | */ | |
231 | static int create_thread_poll_set(struct lttng_poll_event *events, | |
232 | unsigned int size) | |
233 | { | |
234 | int ret; | |
235 | ||
236 | if (events == NULL || size == 0) { | |
237 | ret = -1; | |
238 | goto error; | |
239 | } | |
240 | ||
241 | ret = lttng_poll_create(events, size, LTTNG_CLOEXEC); | |
242 | if (ret < 0) { | |
243 | goto error; | |
244 | } | |
245 | ||
246 | /* Add quit pipe */ | |
247 | ret = lttng_poll_add(events, thread_quit_pipe[0], LPOLLIN); | |
248 | if (ret < 0) { | |
249 | goto error; | |
250 | } | |
251 | ||
252 | return 0; | |
253 | ||
254 | error: | |
255 | return ret; | |
256 | } | |
257 | ||
258 | /* | |
259 | * Check if the thread quit pipe was triggered. | |
260 | * | |
261 | * Return 1 if it was triggered else 0; | |
262 | */ | |
263 | static int check_thread_quit_pipe(int fd, uint32_t events) | |
264 | { | |
265 | if (fd == thread_quit_pipe[0] && (events & LPOLLIN)) { | |
266 | return 1; | |
267 | } | |
268 | ||
269 | return 0; | |
270 | } | |
271 | ||
0fdd1e2c DG |
272 | /* |
273 | * Return group ID of the tracing group or -1 if not found. | |
274 | */ | |
996b65c8 MD |
275 | static gid_t allowed_group(void) |
276 | { | |
277 | struct group *grp; | |
278 | ||
274e143b MD |
279 | if (opt_tracing_group) { |
280 | grp = getgrnam(opt_tracing_group); | |
281 | } else { | |
282 | grp = getgrnam(default_tracing_group); | |
283 | } | |
996b65c8 MD |
284 | if (!grp) { |
285 | return -1; | |
286 | } else { | |
287 | return grp->gr_gid; | |
288 | } | |
289 | } | |
290 | ||
273ea72c | 291 | /* |
5eb91c98 | 292 | * Init thread quit pipe. |
273ea72c DG |
293 | * |
294 | * Return -1 on error or 0 if all pipes are created. | |
295 | */ | |
296 | static int init_thread_quit_pipe(void) | |
297 | { | |
ca4537d3 | 298 | int ret; |
273ea72c | 299 | |
ca4537d3 | 300 | ret = pipe2(thread_quit_pipe, O_CLOEXEC); |
273ea72c | 301 | if (ret < 0) { |
ca4537d3 | 302 | perror("thread quit pipe"); |
273ea72c DG |
303 | goto error; |
304 | } | |
305 | ||
306 | error: | |
307 | return ret; | |
308 | } | |
309 | ||
fac6795d | 310 | /* |
d063d709 DG |
311 | * Complete teardown of a kernel session. This free all data structure related |
312 | * to a kernel session and update counter. | |
fac6795d | 313 | */ |
1d4b027a | 314 | static void teardown_kernel_session(struct ltt_session *session) |
fac6795d | 315 | { |
8f7a84dd | 316 | if (!session->kernel_session) { |
99bab54f | 317 | DBG3("No kernel session when tearing down session"); |
84ea9c99 | 318 | return; |
8f7a84dd DG |
319 | } |
320 | ||
84ea9c99 | 321 | DBG("Tearing down kernel session"); |
d9800920 | 322 | |
84ea9c99 MD |
323 | /* |
324 | * If a custom kernel consumer was registered, close the socket before | |
325 | * tearing down the complete kernel session structure | |
326 | */ | |
327 | if (session->kernel_session->consumer_fd != kconsumer_data.cmd_sock) { | |
328 | lttcomm_close_unix_sock(session->kernel_session->consumer_fd); | |
fac6795d | 329 | } |
84ea9c99 MD |
330 | |
331 | trace_kernel_destroy_session(session->kernel_session); | |
fac6795d DG |
332 | } |
333 | ||
f6a9efaa DG |
334 | /* |
335 | * Complete teardown of all UST sessions. This will free everything on his path | |
336 | * and destroy the core essence of all ust sessions :) | |
337 | */ | |
338 | static void teardown_ust_session(struct ltt_session *session) | |
339 | { | |
84cd17c6 MD |
340 | int ret; |
341 | ||
8f7a84dd | 342 | if (!session->ust_session) { |
99bab54f | 343 | DBG3("No UST session when tearing down session"); |
f470a390 | 344 | return; |
8f7a84dd DG |
345 | } |
346 | ||
84ea9c99 | 347 | DBG("Tearing down UST session(s)"); |
8f7a84dd | 348 | |
84cd17c6 MD |
349 | ret = ust_app_destroy_trace_all(session->ust_session); |
350 | if (ret) { | |
351 | ERR("Error in ust_app_destroy_trace_all"); | |
352 | } | |
8f7a84dd | 353 | |
f6a9efaa DG |
354 | trace_ust_destroy_session(session->ust_session); |
355 | } | |
356 | ||
099e26bd DG |
357 | /* |
358 | * Stop all threads by closing the thread quit pipe. | |
359 | */ | |
cf3af59e MD |
360 | static void stop_threads(void) |
361 | { | |
5eb91c98 DG |
362 | int ret; |
363 | ||
cf3af59e MD |
364 | /* Stopping all threads */ |
365 | DBG("Terminating all threads"); | |
54d01ffb | 366 | ret = notify_thread_pipe(thread_quit_pipe[1]); |
5eb91c98 DG |
367 | if (ret < 0) { |
368 | ERR("write error on thread quit pipe"); | |
369 | } | |
370 | ||
099e26bd DG |
371 | /* Dispatch thread */ |
372 | dispatch_thread_exit = 1; | |
373 | futex_nto1_wake(&ust_cmd_queue.futex); | |
cf3af59e MD |
374 | } |
375 | ||
fac6795d | 376 | /* |
d063d709 | 377 | * Cleanup the daemon |
fac6795d | 378 | */ |
cf3af59e | 379 | static void cleanup(void) |
fac6795d | 380 | { |
1d4b027a DG |
381 | int ret; |
382 | char *cmd; | |
af9737e9 | 383 | struct ltt_session *sess, *stmp; |
fac6795d | 384 | |
1d4b027a | 385 | DBG("Cleaning up"); |
e07ae692 | 386 | |
67e40797 DG |
387 | DBG("Removing %s directory", rundir); |
388 | ret = asprintf(&cmd, "rm -rf %s", rundir); | |
389 | if (ret < 0) { | |
390 | ERR("asprintf failed. Something is really wrong!"); | |
391 | } | |
5461b305 | 392 | |
67e40797 DG |
393 | /* Remove lttng run directory */ |
394 | ret = system(cmd); | |
395 | if (ret < 0) { | |
396 | ERR("Unable to clean %s", rundir); | |
1d4b027a | 397 | } |
67e40797 | 398 | free(cmd); |
5461b305 | 399 | |
99bab54f | 400 | DBG("Cleaning up all sessions"); |
fac6795d | 401 | |
b5541356 | 402 | /* Destroy session list mutex */ |
273ea72c DG |
403 | if (session_list_ptr != NULL) { |
404 | pthread_mutex_destroy(&session_list_ptr->lock); | |
405 | ||
406 | /* Cleanup ALL session */ | |
54d01ffb DG |
407 | cds_list_for_each_entry_safe(sess, stmp, |
408 | &session_list_ptr->head, list) { | |
273ea72c | 409 | teardown_kernel_session(sess); |
f6a9efaa DG |
410 | teardown_ust_session(sess); |
411 | free(sess); | |
273ea72c DG |
412 | } |
413 | } | |
414 | ||
099e26bd | 415 | DBG("Closing all UST sockets"); |
56fff090 | 416 | ust_app_clean_list(); |
099e26bd | 417 | |
3bd1e081 | 418 | pthread_mutex_destroy(&kconsumer_data.pid_mutex); |
b5541356 | 419 | |
4fba7219 DG |
420 | if (is_root && !opt_no_kernel) { |
421 | DBG2("Closing kernel fd"); | |
a4b35e07 MD |
422 | if (kernel_tracer_fd >= 0) { |
423 | close(kernel_tracer_fd); | |
424 | } | |
2f50c8a3 | 425 | DBG("Unloading kernel modules"); |
096102bd | 426 | modprobe_remove_lttng_all(); |
2f50c8a3 | 427 | } |
5eb91c98 DG |
428 | |
429 | close(thread_quit_pipe[0]); | |
430 | close(thread_quit_pipe[1]); | |
421cb601 DG |
431 | |
432 | /* <fun> */ | |
f56a39af | 433 | DBG("%c[%d;%dm*** assert failed :-) *** ==> %c[%dm%c[%d;%dm" |
421cb601 DG |
434 | "Matthew, BEET driven development works!%c[%dm", |
435 | 27, 1, 31, 27, 0, 27, 1, 33, 27, 0); | |
436 | /* </fun> */ | |
fac6795d DG |
437 | } |
438 | ||
e065084a | 439 | /* |
d063d709 | 440 | * Send data on a unix socket using the liblttsessiondcomm API. |
e065084a | 441 | * |
d063d709 | 442 | * Return lttcomm error code. |
e065084a DG |
443 | */ |
444 | static int send_unix_sock(int sock, void *buf, size_t len) | |
445 | { | |
446 | /* Check valid length */ | |
447 | if (len <= 0) { | |
448 | return -1; | |
449 | } | |
450 | ||
451 | return lttcomm_send_unix_sock(sock, buf, len); | |
452 | } | |
453 | ||
5461b305 | 454 | /* |
d063d709 | 455 | * Free memory of a command context structure. |
5461b305 | 456 | */ |
a2fb29a5 | 457 | static void clean_command_ctx(struct command_ctx **cmd_ctx) |
5461b305 | 458 | { |
a2fb29a5 DG |
459 | DBG("Clean command context structure"); |
460 | if (*cmd_ctx) { | |
461 | if ((*cmd_ctx)->llm) { | |
462 | free((*cmd_ctx)->llm); | |
5461b305 | 463 | } |
a2fb29a5 DG |
464 | if ((*cmd_ctx)->lsm) { |
465 | free((*cmd_ctx)->lsm); | |
5461b305 | 466 | } |
a2fb29a5 DG |
467 | free(*cmd_ctx); |
468 | *cmd_ctx = NULL; | |
5461b305 DG |
469 | } |
470 | } | |
471 | ||
f3ed775e | 472 | /* |
d063d709 | 473 | * Send all stream fds of kernel channel to the consumer. |
f3ed775e | 474 | */ |
2bdd86d4 | 475 | static int send_kconsumer_channel_streams(struct consumer_data *consumer_data, |
6df2e2c9 MD |
476 | int sock, struct ltt_kernel_channel *channel, |
477 | uid_t uid, gid_t gid) | |
f3ed775e DG |
478 | { |
479 | int ret; | |
f3ed775e | 480 | struct ltt_kernel_stream *stream; |
3bd1e081 | 481 | struct lttcomm_consumer_msg lkm; |
f3ed775e | 482 | |
3bd1e081 | 483 | DBG("Sending streams of channel %s to kernel consumer", |
54d01ffb | 484 | channel->channel->name); |
f3ed775e | 485 | |
3bd1e081 MD |
486 | /* Send channel */ |
487 | lkm.cmd_type = LTTNG_CONSUMER_ADD_CHANNEL; | |
488 | lkm.u.channel.channel_key = channel->fd; | |
489 | lkm.u.channel.max_sb_size = channel->channel->attr.subbuf_size; | |
490 | lkm.u.channel.mmap_len = 0; /* for kernel */ | |
2bdd86d4 | 491 | DBG("Sending channel %d to consumer", lkm.u.channel.channel_key); |
3bd1e081 | 492 | ret = lttcomm_send_unix_sock(sock, &lkm, sizeof(lkm)); |
f3ed775e | 493 | if (ret < 0) { |
3bd1e081 | 494 | perror("send consumer channel"); |
f3ed775e DG |
495 | goto error; |
496 | } | |
497 | ||
3bd1e081 | 498 | /* Send streams */ |
7a485870 | 499 | cds_list_for_each_entry(stream, &channel->stream_list.head, list) { |
3bd1e081 MD |
500 | if (!stream->fd) { |
501 | continue; | |
502 | } | |
503 | lkm.cmd_type = LTTNG_CONSUMER_ADD_STREAM; | |
504 | lkm.u.stream.channel_key = channel->fd; | |
505 | lkm.u.stream.stream_key = stream->fd; | |
506 | lkm.u.stream.state = stream->state; | |
507 | lkm.u.stream.output = channel->channel->attr.output; | |
508 | lkm.u.stream.mmap_len = 0; /* for kernel */ | |
6df2e2c9 MD |
509 | lkm.u.stream.uid = uid; |
510 | lkm.u.stream.gid = gid; | |
3bd1e081 MD |
511 | strncpy(lkm.u.stream.path_name, stream->pathname, PATH_MAX - 1); |
512 | lkm.u.stream.path_name[PATH_MAX - 1] = '\0'; | |
513 | DBG("Sending stream %d to consumer", lkm.u.stream.stream_key); | |
514 | ret = lttcomm_send_unix_sock(sock, &lkm, sizeof(lkm)); | |
515 | if (ret < 0) { | |
516 | perror("send consumer stream"); | |
517 | goto error; | |
518 | } | |
519 | ret = lttcomm_send_fds_unix_sock(sock, &stream->fd, 1); | |
520 | if (ret < 0) { | |
521 | perror("send consumer stream ancillary data"); | |
522 | goto error; | |
f3ed775e DG |
523 | } |
524 | } | |
525 | ||
3bd1e081 | 526 | DBG("consumer channel streams sent"); |
f3ed775e DG |
527 | |
528 | return 0; | |
529 | ||
530 | error: | |
531 | return ret; | |
532 | } | |
533 | ||
534 | /* | |
d063d709 | 535 | * Send all stream fds of the kernel session to the consumer. |
f3ed775e | 536 | */ |
2bdd86d4 | 537 | static int send_kconsumer_session_streams(struct consumer_data *consumer_data, |
3bd1e081 | 538 | struct ltt_kernel_session *session) |
f3ed775e DG |
539 | { |
540 | int ret; | |
541 | struct ltt_kernel_channel *chan; | |
3bd1e081 MD |
542 | struct lttcomm_consumer_msg lkm; |
543 | int sock = session->consumer_fd; | |
7a485870 DG |
544 | |
545 | DBG("Sending metadata stream fd"); | |
546 | ||
2bdd86d4 | 547 | /* Extra protection. It's NOT supposed to be set to 0 at this point */ |
d9800920 | 548 | if (session->consumer_fd == 0) { |
3bd1e081 | 549 | session->consumer_fd = consumer_data->cmd_sock; |
d9800920 DG |
550 | } |
551 | ||
7a485870 | 552 | if (session->metadata_stream_fd != 0) { |
3bd1e081 MD |
553 | /* Send metadata channel fd */ |
554 | lkm.cmd_type = LTTNG_CONSUMER_ADD_CHANNEL; | |
555 | lkm.u.channel.channel_key = session->metadata->fd; | |
556 | lkm.u.channel.max_sb_size = session->metadata->conf->attr.subbuf_size; | |
557 | lkm.u.channel.mmap_len = 0; /* for kernel */ | |
558 | DBG("Sending metadata channel %d to consumer", lkm.u.stream.stream_key); | |
559 | ret = lttcomm_send_unix_sock(sock, &lkm, sizeof(lkm)); | |
560 | if (ret < 0) { | |
561 | perror("send consumer channel"); | |
562 | goto error; | |
563 | } | |
564 | ||
565 | /* Send metadata stream fd */ | |
566 | lkm.cmd_type = LTTNG_CONSUMER_ADD_STREAM; | |
567 | lkm.u.stream.channel_key = session->metadata->fd; | |
568 | lkm.u.stream.stream_key = session->metadata_stream_fd; | |
569 | lkm.u.stream.state = LTTNG_CONSUMER_ACTIVE_STREAM; | |
570 | lkm.u.stream.output = DEFAULT_KERNEL_CHANNEL_OUTPUT; | |
571 | lkm.u.stream.mmap_len = 0; /* for kernel */ | |
6df2e2c9 MD |
572 | lkm.u.stream.uid = session->uid; |
573 | lkm.u.stream.gid = session->gid; | |
3bd1e081 MD |
574 | strncpy(lkm.u.stream.path_name, session->metadata->pathname, PATH_MAX - 1); |
575 | lkm.u.stream.path_name[PATH_MAX - 1] = '\0'; | |
576 | DBG("Sending metadata stream %d to consumer", lkm.u.stream.stream_key); | |
577 | ret = lttcomm_send_unix_sock(sock, &lkm, sizeof(lkm)); | |
578 | if (ret < 0) { | |
579 | perror("send consumer stream"); | |
580 | goto error; | |
581 | } | |
582 | ret = lttcomm_send_fds_unix_sock(sock, &session->metadata_stream_fd, 1); | |
7a485870 | 583 | if (ret < 0) { |
3bd1e081 | 584 | perror("send consumer stream"); |
7a485870 DG |
585 | goto error; |
586 | } | |
587 | } | |
f3ed775e | 588 | |
f3ed775e | 589 | cds_list_for_each_entry(chan, &session->channel_list.head, list) { |
6df2e2c9 MD |
590 | ret = send_kconsumer_channel_streams(consumer_data, sock, chan, |
591 | session->uid, session->gid); | |
2bdd86d4 MD |
592 | if (ret < 0) { |
593 | goto error; | |
594 | } | |
595 | } | |
596 | ||
597 | DBG("consumer fds (metadata and channel streams) sent"); | |
598 | ||
599 | return 0; | |
600 | ||
601 | error: | |
602 | return ret; | |
603 | } | |
604 | ||
fac6795d | 605 | /* |
0fdd1e2c | 606 | * Notify UST applications using the shm mmap futex. |
fac6795d | 607 | */ |
0fdd1e2c | 608 | static int notify_ust_apps(int active) |
fac6795d | 609 | { |
0fdd1e2c | 610 | char *wait_shm_mmap; |
fac6795d | 611 | |
0fdd1e2c | 612 | DBG("Notifying applications of session daemon state: %d", active); |
e07ae692 | 613 | |
0fdd1e2c DG |
614 | /* See shm.c for this call implying mmap, shm and futex calls */ |
615 | wait_shm_mmap = shm_ust_get_mmap(wait_shm_path, is_root); | |
616 | if (wait_shm_mmap == NULL) { | |
fac6795d DG |
617 | goto error; |
618 | } | |
619 | ||
0fdd1e2c DG |
620 | /* Wake waiting process */ |
621 | futex_wait_update((int32_t *) wait_shm_mmap, active); | |
622 | ||
623 | /* Apps notified successfully */ | |
624 | return 0; | |
fac6795d DG |
625 | |
626 | error: | |
0fdd1e2c | 627 | return -1; |
fac6795d DG |
628 | } |
629 | ||
e065084a | 630 | /* |
d063d709 DG |
631 | * Setup the outgoing data buffer for the response (llm) by allocating the |
632 | * right amount of memory and copying the original information from the lsm | |
633 | * structure. | |
ca95a216 | 634 | * |
d063d709 | 635 | * Return total size of the buffer pointed by buf. |
ca95a216 | 636 | */ |
5461b305 | 637 | static int setup_lttng_msg(struct command_ctx *cmd_ctx, size_t size) |
ca95a216 | 638 | { |
f3ed775e | 639 | int ret, buf_size; |
ca95a216 | 640 | |
f3ed775e | 641 | buf_size = size; |
5461b305 | 642 | |
ba7f0ae5 | 643 | cmd_ctx->llm = zmalloc(sizeof(struct lttcomm_lttng_msg) + buf_size); |
5461b305 | 644 | if (cmd_ctx->llm == NULL) { |
ba7f0ae5 | 645 | perror("zmalloc"); |
5461b305 | 646 | ret = -ENOMEM; |
ca95a216 DG |
647 | goto error; |
648 | } | |
649 | ||
5461b305 DG |
650 | /* Copy common data */ |
651 | cmd_ctx->llm->cmd_type = cmd_ctx->lsm->cmd_type; | |
9f19cc17 | 652 | cmd_ctx->llm->pid = cmd_ctx->lsm->domain.attr.pid; |
5461b305 | 653 | |
5461b305 DG |
654 | cmd_ctx->llm->data_size = size; |
655 | cmd_ctx->lttng_msg_size = sizeof(struct lttcomm_lttng_msg) + buf_size; | |
656 | ||
ca95a216 DG |
657 | return buf_size; |
658 | ||
659 | error: | |
660 | return ret; | |
661 | } | |
662 | ||
7a485870 | 663 | /* |
5eb91c98 | 664 | * Update the kernel poll set of all channel fd available over all tracing |
d063d709 | 665 | * session. Add the wakeup pipe at the end of the set. |
7a485870 | 666 | */ |
5eb91c98 | 667 | static int update_kernel_poll(struct lttng_poll_event *events) |
7a485870 | 668 | { |
5eb91c98 | 669 | int ret; |
7a485870 DG |
670 | struct ltt_session *session; |
671 | struct ltt_kernel_channel *channel; | |
672 | ||
5eb91c98 | 673 | DBG("Updating kernel poll set"); |
7a485870 | 674 | |
54d01ffb | 675 | session_lock_list(); |
b5541356 | 676 | cds_list_for_each_entry(session, &session_list_ptr->head, list) { |
54d01ffb | 677 | session_lock(session); |
7a485870 | 678 | if (session->kernel_session == NULL) { |
54d01ffb | 679 | session_unlock(session); |
7a485870 DG |
680 | continue; |
681 | } | |
7a485870 | 682 | |
54d01ffb DG |
683 | cds_list_for_each_entry(channel, |
684 | &session->kernel_session->channel_list.head, list) { | |
5eb91c98 DG |
685 | /* Add channel fd to the kernel poll set */ |
686 | ret = lttng_poll_add(events, channel->fd, LPOLLIN | LPOLLRDNORM); | |
687 | if (ret < 0) { | |
54d01ffb | 688 | session_unlock(session); |
5eb91c98 DG |
689 | goto error; |
690 | } | |
691 | DBG("Channel fd %d added to kernel set", channel->fd); | |
7a485870 | 692 | } |
54d01ffb | 693 | session_unlock(session); |
7a485870 | 694 | } |
54d01ffb | 695 | session_unlock_list(); |
7a485870 | 696 | |
5eb91c98 | 697 | return 0; |
7a485870 DG |
698 | |
699 | error: | |
54d01ffb | 700 | session_unlock_list(); |
7a485870 DG |
701 | return -1; |
702 | } | |
703 | ||
704 | /* | |
54d01ffb | 705 | * Find the channel fd from 'fd' over all tracing session. When found, check |
d063d709 | 706 | * for new channel stream and send those stream fds to the kernel consumer. |
7a485870 | 707 | * |
d063d709 | 708 | * Useful for CPU hotplug feature. |
7a485870 | 709 | */ |
2bdd86d4 | 710 | static int update_kernel_stream(struct consumer_data *consumer_data, int fd) |
7a485870 DG |
711 | { |
712 | int ret = 0; | |
713 | struct ltt_session *session; | |
714 | struct ltt_kernel_channel *channel; | |
715 | ||
716 | DBG("Updating kernel streams for channel fd %d", fd); | |
717 | ||
54d01ffb | 718 | session_lock_list(); |
b5541356 | 719 | cds_list_for_each_entry(session, &session_list_ptr->head, list) { |
54d01ffb | 720 | session_lock(session); |
7a485870 | 721 | if (session->kernel_session == NULL) { |
54d01ffb | 722 | session_unlock(session); |
7a485870 DG |
723 | continue; |
724 | } | |
d9800920 DG |
725 | |
726 | /* This is not suppose to be 0 but this is an extra security check */ | |
727 | if (session->kernel_session->consumer_fd == 0) { | |
3bd1e081 | 728 | session->kernel_session->consumer_fd = consumer_data->cmd_sock; |
d9800920 DG |
729 | } |
730 | ||
5eb91c98 DG |
731 | cds_list_for_each_entry(channel, |
732 | &session->kernel_session->channel_list.head, list) { | |
7a485870 DG |
733 | if (channel->fd == fd) { |
734 | DBG("Channel found, updating kernel streams"); | |
735 | ret = kernel_open_channel_stream(channel); | |
736 | if (ret < 0) { | |
b3c750d2 | 737 | goto error; |
7a485870 | 738 | } |
d9800920 | 739 | |
7a485870 | 740 | /* |
5eb91c98 DG |
741 | * Have we already sent fds to the consumer? If yes, it means |
742 | * that tracing is started so it is safe to send our updated | |
743 | * stream fds. | |
7a485870 | 744 | */ |
3bd1e081 | 745 | if (session->kernel_session->consumer_fds_sent == 1) { |
2bdd86d4 | 746 | ret = send_kconsumer_channel_streams(consumer_data, |
6df2e2c9 MD |
747 | session->kernel_session->consumer_fd, channel, |
748 | session->uid, session->gid); | |
7a485870 | 749 | if (ret < 0) { |
b3c750d2 | 750 | goto error; |
7a485870 DG |
751 | } |
752 | } | |
b3c750d2 | 753 | goto error; |
7a485870 DG |
754 | } |
755 | } | |
54d01ffb | 756 | session_unlock(session); |
7a485870 | 757 | } |
54d01ffb | 758 | session_unlock_list(); |
b3c750d2 | 759 | return ret; |
7a485870 | 760 | |
b3c750d2 | 761 | error: |
54d01ffb DG |
762 | session_unlock(session); |
763 | session_unlock_list(); | |
7a485870 DG |
764 | return ret; |
765 | } | |
766 | ||
487cf67c DG |
767 | /* |
768 | * For each tracing session, update newly registered apps. | |
769 | */ | |
770 | static void update_ust_app(int app_sock) | |
771 | { | |
772 | struct ltt_session *sess, *stmp; | |
773 | ||
4ee14516 DG |
774 | session_lock_list(); |
775 | ||
487cf67c DG |
776 | /* For all tracing session(s) */ |
777 | cds_list_for_each_entry_safe(sess, stmp, &session_list_ptr->head, list) { | |
4ee14516 | 778 | session_lock(sess); |
421cb601 DG |
779 | if (sess->ust_session) { |
780 | ust_app_global_update(sess->ust_session, app_sock); | |
781 | } | |
4ee14516 | 782 | session_unlock(sess); |
487cf67c | 783 | } |
4ee14516 DG |
784 | |
785 | session_unlock_list(); | |
487cf67c DG |
786 | } |
787 | ||
7a485870 | 788 | /* |
d063d709 | 789 | * This thread manage event coming from the kernel. |
7a485870 | 790 | * |
d063d709 DG |
791 | * Features supported in this thread: |
792 | * -) CPU Hotplug | |
7a485870 DG |
793 | */ |
794 | static void *thread_manage_kernel(void *data) | |
795 | { | |
5eb91c98 DG |
796 | int ret, i, pollfd, update_poll_flag = 1; |
797 | uint32_t revents, nb_fd; | |
7a485870 | 798 | char tmp; |
5eb91c98 | 799 | struct lttng_poll_event events; |
7a485870 DG |
800 | |
801 | DBG("Thread manage kernel started"); | |
802 | ||
5eb91c98 DG |
803 | ret = create_thread_poll_set(&events, 2); |
804 | if (ret < 0) { | |
805 | goto error; | |
806 | } | |
807 | ||
808 | ret = lttng_poll_add(&events, kernel_poll_pipe[0], LPOLLIN); | |
809 | if (ret < 0) { | |
810 | goto error; | |
811 | } | |
812 | ||
7a485870 DG |
813 | while (1) { |
814 | if (update_poll_flag == 1) { | |
5f822d0a DG |
815 | /* |
816 | * Reset number of fd in the poll set. Always 2 since there is the thread | |
817 | * quit pipe and the kernel pipe. | |
818 | */ | |
819 | events.nb_fd = 2; | |
820 | ||
5eb91c98 DG |
821 | ret = update_kernel_poll(&events); |
822 | if (ret < 0) { | |
7a485870 DG |
823 | goto error; |
824 | } | |
825 | update_poll_flag = 0; | |
826 | } | |
827 | ||
5eb91c98 DG |
828 | nb_fd = LTTNG_POLL_GETNB(&events); |
829 | ||
830 | DBG("Thread kernel polling on %d fds", nb_fd); | |
831 | ||
832 | /* Zeroed the poll events */ | |
833 | lttng_poll_reset(&events); | |
7a485870 DG |
834 | |
835 | /* Poll infinite value of time */ | |
a8b0b341 | 836 | restart: |
5eb91c98 | 837 | ret = lttng_poll_wait(&events, -1); |
7a485870 | 838 | if (ret < 0) { |
a8b0b341 MD |
839 | /* |
840 | * Restart interrupted system call. | |
841 | */ | |
842 | if (errno == EINTR) { | |
843 | goto restart; | |
844 | } | |
7a485870 DG |
845 | goto error; |
846 | } else if (ret == 0) { | |
847 | /* Should not happen since timeout is infinite */ | |
85611738 DG |
848 | ERR("Return value of poll is 0 with an infinite timeout.\n" |
849 | "This should not have happened! Continuing..."); | |
7a485870 DG |
850 | continue; |
851 | } | |
852 | ||
5eb91c98 DG |
853 | for (i = 0; i < nb_fd; i++) { |
854 | /* Fetch once the poll data */ | |
855 | revents = LTTNG_POLL_GETEV(&events, i); | |
856 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
7a485870 | 857 | |
5eb91c98 DG |
858 | /* Thread quit pipe has been closed. Killing thread. */ |
859 | ret = check_thread_quit_pipe(pollfd, revents); | |
860 | if (ret) { | |
861 | goto error; | |
862 | } | |
7a485870 | 863 | |
5eb91c98 DG |
864 | /* Check for data on kernel pipe */ |
865 | if (pollfd == kernel_poll_pipe[0] && (revents & LPOLLIN)) { | |
866 | ret = read(kernel_poll_pipe[0], &tmp, 1); | |
867 | update_poll_flag = 1; | |
868 | continue; | |
869 | } else { | |
870 | /* | |
871 | * New CPU detected by the kernel. Adding kernel stream to | |
872 | * kernel session and updating the kernel consumer | |
873 | */ | |
874 | if (revents & LPOLLIN) { | |
2bdd86d4 | 875 | ret = update_kernel_stream(&kconsumer_data, pollfd); |
5eb91c98 DG |
876 | if (ret < 0) { |
877 | continue; | |
878 | } | |
879 | break; | |
880 | /* | |
881 | * TODO: We might want to handle the LPOLLERR | LPOLLHUP | |
882 | * and unregister kernel stream at this point. | |
883 | */ | |
7a485870 | 884 | } |
7a485870 DG |
885 | } |
886 | } | |
887 | } | |
888 | ||
889 | error: | |
890 | DBG("Kernel thread dying"); | |
273ea72c DG |
891 | close(kernel_poll_pipe[0]); |
892 | close(kernel_poll_pipe[1]); | |
5eb91c98 DG |
893 | |
894 | lttng_poll_clean(&events); | |
895 | ||
7a485870 DG |
896 | return NULL; |
897 | } | |
898 | ||
1d4b027a | 899 | /* |
3bd1e081 | 900 | * This thread manage the consumer error sent back to the session daemon. |
1d4b027a | 901 | */ |
3bd1e081 | 902 | static void *thread_manage_consumer(void *data) |
1d4b027a | 903 | { |
5eb91c98 DG |
904 | int sock = 0, i, ret, pollfd; |
905 | uint32_t revents, nb_fd; | |
1d4b027a | 906 | enum lttcomm_return_code code; |
5eb91c98 | 907 | struct lttng_poll_event events; |
3bd1e081 | 908 | struct consumer_data *consumer_data = data; |
1d4b027a | 909 | |
3bd1e081 | 910 | DBG("[thread] Manage consumer started"); |
1d4b027a | 911 | |
3bd1e081 | 912 | ret = lttcomm_listen_unix_sock(consumer_data->err_sock); |
1d4b027a DG |
913 | if (ret < 0) { |
914 | goto error; | |
915 | } | |
916 | ||
5eb91c98 DG |
917 | /* |
918 | * Pass 2 as size here for the thread quit pipe and kconsumerd_err_sock. | |
919 | * Nothing more will be added to this poll set. | |
920 | */ | |
921 | ret = create_thread_poll_set(&events, 2); | |
922 | if (ret < 0) { | |
923 | goto error; | |
924 | } | |
273ea72c | 925 | |
3bd1e081 | 926 | ret = lttng_poll_add(&events, consumer_data->err_sock, LPOLLIN | LPOLLRDHUP); |
5eb91c98 DG |
927 | if (ret < 0) { |
928 | goto error; | |
929 | } | |
930 | ||
931 | nb_fd = LTTNG_POLL_GETNB(&events); | |
273ea72c DG |
932 | |
933 | /* Inifinite blocking call, waiting for transmission */ | |
a8b0b341 | 934 | restart: |
5eb91c98 | 935 | ret = lttng_poll_wait(&events, -1); |
273ea72c | 936 | if (ret < 0) { |
a8b0b341 MD |
937 | /* |
938 | * Restart interrupted system call. | |
939 | */ | |
940 | if (errno == EINTR) { | |
941 | goto restart; | |
942 | } | |
273ea72c DG |
943 | goto error; |
944 | } | |
945 | ||
5eb91c98 DG |
946 | for (i = 0; i < nb_fd; i++) { |
947 | /* Fetch once the poll data */ | |
948 | revents = LTTNG_POLL_GETEV(&events, i); | |
949 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
950 | ||
951 | /* Thread quit pipe has been closed. Killing thread. */ | |
952 | ret = check_thread_quit_pipe(pollfd, revents); | |
953 | if (ret) { | |
954 | goto error; | |
955 | } | |
956 | ||
957 | /* Event on the registration socket */ | |
3bd1e081 | 958 | if (pollfd == consumer_data->err_sock) { |
5eb91c98 | 959 | if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { |
3bd1e081 | 960 | ERR("consumer err socket poll error"); |
5eb91c98 DG |
961 | goto error; |
962 | } | |
963 | } | |
273ea72c DG |
964 | } |
965 | ||
3bd1e081 | 966 | sock = lttcomm_accept_unix_sock(consumer_data->err_sock); |
1d4b027a DG |
967 | if (sock < 0) { |
968 | goto error; | |
969 | } | |
970 | ||
3bd1e081 | 971 | DBG2("Receiving code from consumer err_sock"); |
ee0b0061 | 972 | |
712ea556 | 973 | /* Getting status code from kconsumerd */ |
54d01ffb DG |
974 | ret = lttcomm_recv_unix_sock(sock, &code, |
975 | sizeof(enum lttcomm_return_code)); | |
1d4b027a DG |
976 | if (ret <= 0) { |
977 | goto error; | |
978 | } | |
979 | ||
3bd1e081 MD |
980 | if (code == CONSUMERD_COMMAND_SOCK_READY) { |
981 | consumer_data->cmd_sock = | |
982 | lttcomm_connect_unix_sock(consumer_data->cmd_unix_sock_path); | |
983 | if (consumer_data->cmd_sock < 0) { | |
984 | sem_post(&consumer_data->sem); | |
48842b30 | 985 | PERROR("consumer connect"); |
1d4b027a DG |
986 | goto error; |
987 | } | |
988 | /* Signal condition to tell that the kconsumerd is ready */ | |
3bd1e081 MD |
989 | sem_post(&consumer_data->sem); |
990 | DBG("consumer command socket ready"); | |
1d4b027a | 991 | } else { |
3bd1e081 | 992 | ERR("consumer error when waiting for SOCK_READY : %s", |
1d4b027a DG |
993 | lttcomm_get_readable_code(-code)); |
994 | goto error; | |
995 | } | |
996 | ||
54d01ffb | 997 | /* Remove the kconsumerd error sock since we've established a connexion */ |
3bd1e081 | 998 | ret = lttng_poll_del(&events, consumer_data->err_sock); |
72079cae | 999 | if (ret < 0) { |
72079cae DG |
1000 | goto error; |
1001 | } | |
1002 | ||
5eb91c98 DG |
1003 | ret = lttng_poll_add(&events, sock, LPOLLIN | LPOLLRDHUP); |
1004 | if (ret < 0) { | |
72079cae | 1005 | goto error; |
5eb91c98 DG |
1006 | } |
1007 | ||
1008 | /* Update number of fd */ | |
1009 | nb_fd = LTTNG_POLL_GETNB(&events); | |
1010 | ||
1011 | /* Inifinite blocking call, waiting for transmission */ | |
a8b0b341 | 1012 | restart_poll: |
5eb91c98 DG |
1013 | ret = lttng_poll_wait(&events, -1); |
1014 | if (ret < 0) { | |
a8b0b341 MD |
1015 | /* |
1016 | * Restart interrupted system call. | |
1017 | */ | |
1018 | if (errno == EINTR) { | |
1019 | goto restart_poll; | |
1020 | } | |
72079cae DG |
1021 | goto error; |
1022 | } | |
1023 | ||
5eb91c98 DG |
1024 | for (i = 0; i < nb_fd; i++) { |
1025 | /* Fetch once the poll data */ | |
1026 | revents = LTTNG_POLL_GETEV(&events, i); | |
1027 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
1028 | ||
1029 | /* Thread quit pipe has been closed. Killing thread. */ | |
1030 | ret = check_thread_quit_pipe(pollfd, revents); | |
1031 | if (ret) { | |
1032 | goto error; | |
1033 | } | |
1034 | ||
1035 | /* Event on the kconsumerd socket */ | |
1036 | if (pollfd == sock) { | |
1037 | if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { | |
3bd1e081 | 1038 | ERR("consumer err socket second poll error"); |
5eb91c98 DG |
1039 | goto error; |
1040 | } | |
1041 | } | |
1042 | } | |
1043 | ||
712ea556 | 1044 | /* Wait for any kconsumerd error */ |
54d01ffb DG |
1045 | ret = lttcomm_recv_unix_sock(sock, &code, |
1046 | sizeof(enum lttcomm_return_code)); | |
712ea556 | 1047 | if (ret <= 0) { |
3bd1e081 | 1048 | ERR("consumer closed the command socket"); |
712ea556 | 1049 | goto error; |
6f61d021 | 1050 | } |
1d4b027a | 1051 | |
3bd1e081 | 1052 | ERR("consumer return code : %s", lttcomm_get_readable_code(-code)); |
712ea556 | 1053 | |
1d4b027a | 1054 | error: |
3bd1e081 MD |
1055 | DBG("consumer thread dying"); |
1056 | close(consumer_data->err_sock); | |
1057 | close(consumer_data->cmd_sock); | |
5eb91c98 | 1058 | close(sock); |
273ea72c | 1059 | |
3bd1e081 MD |
1060 | unlink(consumer_data->err_unix_sock_path); |
1061 | unlink(consumer_data->cmd_unix_sock_path); | |
1062 | consumer_data->pid = 0; | |
1d4b027a | 1063 | |
5eb91c98 | 1064 | lttng_poll_clean(&events); |
0177d773 | 1065 | |
5eb91c98 | 1066 | return NULL; |
099e26bd DG |
1067 | } |
1068 | ||
099e26bd DG |
1069 | /* |
1070 | * This thread manage application communication. | |
1d4b027a DG |
1071 | */ |
1072 | static void *thread_manage_apps(void *data) | |
099e26bd | 1073 | { |
5eb91c98 DG |
1074 | int i, ret, pollfd; |
1075 | uint32_t revents, nb_fd; | |
099e26bd | 1076 | struct ust_command ust_cmd; |
5eb91c98 | 1077 | struct lttng_poll_event events; |
099e26bd DG |
1078 | |
1079 | DBG("[thread] Manage application started"); | |
1080 | ||
f6a9efaa DG |
1081 | rcu_register_thread(); |
1082 | rcu_thread_online(); | |
1083 | ||
5eb91c98 DG |
1084 | ret = create_thread_poll_set(&events, 2); |
1085 | if (ret < 0) { | |
1086 | goto error; | |
1087 | } | |
099e26bd | 1088 | |
5eb91c98 DG |
1089 | ret = lttng_poll_add(&events, apps_cmd_pipe[0], LPOLLIN | LPOLLRDHUP); |
1090 | if (ret < 0) { | |
1091 | goto error; | |
1092 | } | |
099e26bd | 1093 | |
5eb91c98 DG |
1094 | while (1) { |
1095 | /* Zeroed the events structure */ | |
1096 | lttng_poll_reset(&events); | |
0177d773 | 1097 | |
5eb91c98 | 1098 | nb_fd = LTTNG_POLL_GETNB(&events); |
099e26bd DG |
1099 | |
1100 | DBG("Apps thread polling on %d fds", nb_fd); | |
1101 | ||
1102 | /* Inifinite blocking call, waiting for transmission */ | |
a8b0b341 | 1103 | restart: |
5eb91c98 | 1104 | ret = lttng_poll_wait(&events, -1); |
099e26bd | 1105 | if (ret < 0) { |
a8b0b341 MD |
1106 | /* |
1107 | * Restart interrupted system call. | |
1108 | */ | |
1109 | if (errno == EINTR) { | |
1110 | goto restart; | |
1111 | } | |
099e26bd DG |
1112 | goto error; |
1113 | } | |
1114 | ||
5eb91c98 DG |
1115 | for (i = 0; i < nb_fd; i++) { |
1116 | /* Fetch once the poll data */ | |
1117 | revents = LTTNG_POLL_GETEV(&events, i); | |
1118 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
1119 | ||
1120 | /* Thread quit pipe has been closed. Killing thread. */ | |
1121 | ret = check_thread_quit_pipe(pollfd, revents); | |
1122 | if (ret) { | |
099e26bd | 1123 | goto error; |
5eb91c98 | 1124 | } |
099e26bd | 1125 | |
5eb91c98 DG |
1126 | /* Inspect the apps cmd pipe */ |
1127 | if (pollfd == apps_cmd_pipe[0]) { | |
1128 | if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { | |
1129 | ERR("Apps command pipe error"); | |
0177d773 | 1130 | goto error; |
5eb91c98 DG |
1131 | } else if (revents & LPOLLIN) { |
1132 | /* Empty pipe */ | |
1133 | ret = read(apps_cmd_pipe[0], &ust_cmd, sizeof(ust_cmd)); | |
1134 | if (ret < 0 || ret < sizeof(ust_cmd)) { | |
1135 | perror("read apps cmd pipe"); | |
1136 | goto error; | |
1137 | } | |
099e26bd | 1138 | |
5eb91c98 | 1139 | /* Register applicaton to the session daemon */ |
56fff090 | 1140 | ret = ust_app_register(&ust_cmd.reg_msg, |
54d01ffb | 1141 | ust_cmd.sock); |
88ff5b7f | 1142 | if (ret == -ENOMEM) { |
5eb91c98 | 1143 | goto error; |
88ff5b7f MD |
1144 | } else if (ret < 0) { |
1145 | break; | |
5eb91c98 DG |
1146 | } |
1147 | ||
acc7b41b | 1148 | /* |
e0c7ec2b | 1149 | * Validate UST version compatibility. |
acc7b41b | 1150 | */ |
e0c7ec2b DG |
1151 | ret = ust_app_validate_version(ust_cmd.sock); |
1152 | if (ret >= 0) { | |
1153 | /* | |
1154 | * Add channel(s) and event(s) to newly registered apps | |
1155 | * from lttng global UST domain. | |
1156 | */ | |
1157 | update_ust_app(ust_cmd.sock); | |
1158 | } | |
acc7b41b | 1159 | |
f2ca2e25 | 1160 | ret = ust_app_register_done(ust_cmd.sock); |
5eb91c98 DG |
1161 | if (ret < 0) { |
1162 | /* | |
1163 | * If the registration is not possible, we simply | |
1164 | * unregister the apps and continue | |
1165 | */ | |
56fff090 | 1166 | ust_app_unregister(ust_cmd.sock); |
5eb91c98 DG |
1167 | } else { |
1168 | /* | |
1169 | * We just need here to monitor the close of the UST | |
1170 | * socket and poll set monitor those by default. | |
ab08a675 MD |
1171 | * Listen on POLLIN (even if we never expect any |
1172 | * data) to ensure that hangup wakes us. | |
5eb91c98 | 1173 | */ |
ab08a675 | 1174 | ret = lttng_poll_add(&events, ust_cmd.sock, LPOLLIN); |
5eb91c98 DG |
1175 | if (ret < 0) { |
1176 | goto error; | |
1177 | } | |
1178 | ||
54d01ffb DG |
1179 | DBG("Apps with sock %d added to poll set", |
1180 | ust_cmd.sock); | |
5eb91c98 | 1181 | } |
487cf67c | 1182 | |
5eb91c98 | 1183 | break; |
0177d773 | 1184 | } |
5eb91c98 DG |
1185 | } else { |
1186 | /* | |
54d01ffb DG |
1187 | * At this point, we know that a registered application made |
1188 | * the event at poll_wait. | |
5eb91c98 DG |
1189 | */ |
1190 | if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { | |
1191 | /* Removing from the poll set */ | |
1192 | ret = lttng_poll_del(&events, pollfd); | |
1193 | if (ret < 0) { | |
1194 | goto error; | |
1195 | } | |
099e26bd | 1196 | |
b9d9b220 | 1197 | /* Socket closed on remote end. */ |
56fff090 | 1198 | ust_app_unregister(pollfd); |
5eb91c98 DG |
1199 | break; |
1200 | } | |
099e26bd DG |
1201 | } |
1202 | } | |
099e26bd DG |
1203 | } |
1204 | ||
1205 | error: | |
1206 | DBG("Application communication apps dying"); | |
1207 | close(apps_cmd_pipe[0]); | |
1208 | close(apps_cmd_pipe[1]); | |
1209 | ||
5eb91c98 | 1210 | lttng_poll_clean(&events); |
099e26bd | 1211 | |
f6a9efaa DG |
1212 | rcu_thread_offline(); |
1213 | rcu_unregister_thread(); | |
099e26bd DG |
1214 | return NULL; |
1215 | } | |
1216 | ||
1217 | /* | |
1218 | * Dispatch request from the registration threads to the application | |
1219 | * communication thread. | |
1220 | */ | |
1221 | static void *thread_dispatch_ust_registration(void *data) | |
1222 | { | |
1223 | int ret; | |
1224 | struct cds_wfq_node *node; | |
1225 | struct ust_command *ust_cmd = NULL; | |
1226 | ||
1227 | DBG("[thread] Dispatch UST command started"); | |
1228 | ||
1229 | while (!dispatch_thread_exit) { | |
1230 | /* Atomically prepare the queue futex */ | |
1231 | futex_nto1_prepare(&ust_cmd_queue.futex); | |
1232 | ||
1233 | do { | |
1234 | /* Dequeue command for registration */ | |
1235 | node = cds_wfq_dequeue_blocking(&ust_cmd_queue.queue); | |
1236 | if (node == NULL) { | |
00a17c97 | 1237 | DBG("Woken up but nothing in the UST command queue"); |
099e26bd DG |
1238 | /* Continue thread execution */ |
1239 | break; | |
1240 | } | |
1241 | ||
1242 | ust_cmd = caa_container_of(node, struct ust_command, node); | |
1243 | ||
2f50c8a3 DG |
1244 | DBG("Dispatching UST registration pid:%d ppid:%d uid:%d" |
1245 | " gid:%d sock:%d name:%s (version %d.%d)", | |
1246 | ust_cmd->reg_msg.pid, ust_cmd->reg_msg.ppid, | |
1247 | ust_cmd->reg_msg.uid, ust_cmd->reg_msg.gid, | |
1248 | ust_cmd->sock, ust_cmd->reg_msg.name, | |
1249 | ust_cmd->reg_msg.major, ust_cmd->reg_msg.minor); | |
099e26bd DG |
1250 | /* |
1251 | * Inform apps thread of the new application registration. This | |
1252 | * call is blocking so we can be assured that the data will be read | |
1253 | * at some point in time or wait to the end of the world :) | |
1254 | */ | |
1255 | ret = write(apps_cmd_pipe[1], ust_cmd, | |
1256 | sizeof(struct ust_command)); | |
1257 | if (ret < 0) { | |
1258 | perror("write apps cmd pipe"); | |
1259 | if (errno == EBADF) { | |
1260 | /* | |
1261 | * We can't inform the application thread to process | |
1262 | * registration. We will exit or else application | |
1263 | * registration will not occur and tracing will never | |
1264 | * start. | |
1265 | */ | |
1266 | goto error; | |
1267 | } | |
1268 | } | |
1269 | free(ust_cmd); | |
1270 | } while (node != NULL); | |
1271 | ||
1272 | /* Futex wait on queue. Blocking call on futex() */ | |
1273 | futex_nto1_wait(&ust_cmd_queue.futex); | |
1274 | } | |
1275 | ||
1276 | error: | |
1277 | DBG("Dispatch thread dying"); | |
1278 | return NULL; | |
1279 | } | |
1280 | ||
1281 | /* | |
1282 | * This thread manage application registration. | |
1283 | */ | |
1284 | static void *thread_registration_apps(void *data) | |
1d4b027a | 1285 | { |
a4b35e07 | 1286 | int sock = -1, i, ret, pollfd; |
5eb91c98 DG |
1287 | uint32_t revents, nb_fd; |
1288 | struct lttng_poll_event events; | |
099e26bd DG |
1289 | /* |
1290 | * Get allocated in this thread, enqueued to a global queue, dequeued and | |
1291 | * freed in the manage apps thread. | |
1292 | */ | |
1293 | struct ust_command *ust_cmd = NULL; | |
1d4b027a | 1294 | |
099e26bd | 1295 | DBG("[thread] Manage application registration started"); |
1d4b027a DG |
1296 | |
1297 | ret = lttcomm_listen_unix_sock(apps_sock); | |
1298 | if (ret < 0) { | |
1299 | goto error; | |
1300 | } | |
1301 | ||
5eb91c98 DG |
1302 | /* |
1303 | * Pass 2 as size here for the thread quit pipe and apps socket. Nothing | |
1304 | * more will be added to this poll set. | |
1305 | */ | |
1306 | ret = create_thread_poll_set(&events, 2); | |
1307 | if (ret < 0) { | |
1308 | goto error; | |
1309 | } | |
273ea72c | 1310 | |
5eb91c98 DG |
1311 | /* Add the application registration socket */ |
1312 | ret = lttng_poll_add(&events, apps_sock, LPOLLIN | LPOLLRDHUP); | |
1313 | if (ret < 0) { | |
1314 | goto error; | |
1315 | } | |
273ea72c | 1316 | |
1d4b027a | 1317 | /* Notify all applications to register */ |
0fdd1e2c DG |
1318 | ret = notify_ust_apps(1); |
1319 | if (ret < 0) { | |
1320 | ERR("Failed to notify applications or create the wait shared memory.\n" | |
54d01ffb DG |
1321 | "Execution continues but there might be problem for already\n" |
1322 | "running applications that wishes to register."); | |
0fdd1e2c | 1323 | } |
1d4b027a DG |
1324 | |
1325 | while (1) { | |
1326 | DBG("Accepting application registration"); | |
273ea72c | 1327 | |
5eb91c98 DG |
1328 | nb_fd = LTTNG_POLL_GETNB(&events); |
1329 | ||
273ea72c | 1330 | /* Inifinite blocking call, waiting for transmission */ |
a8b0b341 | 1331 | restart: |
5eb91c98 | 1332 | ret = lttng_poll_wait(&events, -1); |
273ea72c | 1333 | if (ret < 0) { |
a8b0b341 MD |
1334 | /* |
1335 | * Restart interrupted system call. | |
1336 | */ | |
1337 | if (errno == EINTR) { | |
1338 | goto restart; | |
1339 | } | |
273ea72c DG |
1340 | goto error; |
1341 | } | |
1342 | ||
5eb91c98 DG |
1343 | for (i = 0; i < nb_fd; i++) { |
1344 | /* Fetch once the poll data */ | |
1345 | revents = LTTNG_POLL_GETEV(&events, i); | |
1346 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
273ea72c | 1347 | |
5eb91c98 DG |
1348 | /* Thread quit pipe has been closed. Killing thread. */ |
1349 | ret = check_thread_quit_pipe(pollfd, revents); | |
1350 | if (ret) { | |
90014c57 DG |
1351 | goto error; |
1352 | } | |
1d4b027a | 1353 | |
5eb91c98 DG |
1354 | /* Event on the registration socket */ |
1355 | if (pollfd == apps_sock) { | |
1356 | if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { | |
1357 | ERR("Register apps socket poll error"); | |
1358 | goto error; | |
1359 | } else if (revents & LPOLLIN) { | |
1360 | sock = lttcomm_accept_unix_sock(apps_sock); | |
1361 | if (sock < 0) { | |
1362 | goto error; | |
1363 | } | |
099e26bd | 1364 | |
5eb91c98 | 1365 | /* Create UST registration command for enqueuing */ |
ba7f0ae5 | 1366 | ust_cmd = zmalloc(sizeof(struct ust_command)); |
5eb91c98 | 1367 | if (ust_cmd == NULL) { |
ba7f0ae5 | 1368 | perror("ust command zmalloc"); |
5eb91c98 DG |
1369 | goto error; |
1370 | } | |
1d4b027a | 1371 | |
5eb91c98 DG |
1372 | /* |
1373 | * Using message-based transmissions to ensure we don't | |
1374 | * have to deal with partially received messages. | |
1375 | */ | |
1376 | ret = lttcomm_recv_unix_sock(sock, &ust_cmd->reg_msg, | |
1377 | sizeof(struct ust_register_msg)); | |
1378 | if (ret < 0 || ret < sizeof(struct ust_register_msg)) { | |
1379 | if (ret < 0) { | |
1380 | perror("lttcomm_recv_unix_sock register apps"); | |
1381 | } else { | |
1382 | ERR("Wrong size received on apps register"); | |
1383 | } | |
1384 | free(ust_cmd); | |
1385 | close(sock); | |
1386 | continue; | |
1387 | } | |
099e26bd | 1388 | |
5eb91c98 | 1389 | ust_cmd->sock = sock; |
099e26bd | 1390 | |
5eb91c98 DG |
1391 | DBG("UST registration received with pid:%d ppid:%d uid:%d" |
1392 | " gid:%d sock:%d name:%s (version %d.%d)", | |
1393 | ust_cmd->reg_msg.pid, ust_cmd->reg_msg.ppid, | |
1394 | ust_cmd->reg_msg.uid, ust_cmd->reg_msg.gid, | |
1395 | ust_cmd->sock, ust_cmd->reg_msg.name, | |
1396 | ust_cmd->reg_msg.major, ust_cmd->reg_msg.minor); | |
54d01ffb | 1397 | |
5eb91c98 DG |
1398 | /* |
1399 | * Lock free enqueue the registration request. The red pill | |
54d01ffb | 1400 | * has been taken! This apps will be part of the *system*. |
5eb91c98 DG |
1401 | */ |
1402 | cds_wfq_enqueue(&ust_cmd_queue.queue, &ust_cmd->node); | |
1403 | ||
1404 | /* | |
1405 | * Wake the registration queue futex. Implicit memory | |
1406 | * barrier with the exchange in cds_wfq_enqueue. | |
1407 | */ | |
1408 | futex_nto1_wake(&ust_cmd_queue.futex); | |
1409 | } | |
1410 | } | |
90014c57 | 1411 | } |
1d4b027a DG |
1412 | } |
1413 | ||
1414 | error: | |
0fdd1e2c DG |
1415 | DBG("UST Registration thread dying"); |
1416 | ||
1417 | /* Notify that the registration thread is gone */ | |
1418 | notify_ust_apps(0); | |
1419 | ||
a4b35e07 MD |
1420 | if (apps_sock >= 0) { |
1421 | close(apps_sock); | |
1422 | } | |
1423 | if (clock >= 0) { | |
1424 | close(sock); | |
1425 | } | |
273ea72c | 1426 | unlink(apps_unix_sock_path); |
0fdd1e2c | 1427 | |
5eb91c98 DG |
1428 | lttng_poll_clean(&events); |
1429 | ||
1d4b027a DG |
1430 | return NULL; |
1431 | } | |
1432 | ||
8c0faa1d | 1433 | /* |
3bd1e081 | 1434 | * Start the thread_manage_consumer. This must be done after a lttng-consumerd |
d063d709 | 1435 | * exec or it will fails. |
8c0faa1d | 1436 | */ |
3bd1e081 | 1437 | static int spawn_consumer_thread(struct consumer_data *consumer_data) |
8c0faa1d DG |
1438 | { |
1439 | int ret; | |
ee0b0061 DG |
1440 | struct timespec timeout; |
1441 | ||
1442 | timeout.tv_sec = DEFAULT_SEM_WAIT_TIMEOUT; | |
1443 | timeout.tv_nsec = 0; | |
8c0faa1d DG |
1444 | |
1445 | /* Setup semaphore */ | |
3bd1e081 | 1446 | ret = sem_init(&consumer_data->sem, 0, 0); |
ee0b0061 | 1447 | if (ret < 0) { |
3bd1e081 | 1448 | PERROR("sem_init consumer semaphore"); |
ee0b0061 DG |
1449 | goto error; |
1450 | } | |
8c0faa1d | 1451 | |
3bd1e081 MD |
1452 | ret = pthread_create(&consumer_data->thread, NULL, |
1453 | thread_manage_consumer, consumer_data); | |
8c0faa1d | 1454 | if (ret != 0) { |
3bd1e081 | 1455 | PERROR("pthread_create consumer"); |
ee0b0061 | 1456 | ret = -1; |
8c0faa1d DG |
1457 | goto error; |
1458 | } | |
1459 | ||
ee0b0061 DG |
1460 | /* Get time for sem_timedwait absolute timeout */ |
1461 | ret = clock_gettime(CLOCK_REALTIME, &timeout); | |
1462 | if (ret < 0) { | |
3bd1e081 | 1463 | PERROR("clock_gettime spawn consumer"); |
ee0b0061 | 1464 | /* Infinite wait for the kconsumerd thread to be ready */ |
3bd1e081 | 1465 | ret = sem_wait(&consumer_data->sem); |
ee0b0061 DG |
1466 | } else { |
1467 | /* Normal timeout if the gettime was successful */ | |
1468 | timeout.tv_sec += DEFAULT_SEM_WAIT_TIMEOUT; | |
3bd1e081 | 1469 | ret = sem_timedwait(&consumer_data->sem, &timeout); |
ee0b0061 | 1470 | } |
8c0faa1d | 1471 | |
ee0b0061 DG |
1472 | if (ret < 0) { |
1473 | if (errno == ETIMEDOUT) { | |
1474 | /* | |
1475 | * Call has timed out so we kill the kconsumerd_thread and return | |
1476 | * an error. | |
1477 | */ | |
3bd1e081 MD |
1478 | ERR("The consumer thread was never ready. Killing it"); |
1479 | ret = pthread_cancel(consumer_data->thread); | |
ee0b0061 | 1480 | if (ret < 0) { |
3bd1e081 | 1481 | PERROR("pthread_cancel consumer thread"); |
ee0b0061 DG |
1482 | } |
1483 | } else { | |
3bd1e081 | 1484 | PERROR("semaphore wait failed consumer thread"); |
ee0b0061 DG |
1485 | } |
1486 | goto error; | |
1487 | } | |
1488 | ||
3bd1e081 MD |
1489 | pthread_mutex_lock(&consumer_data->pid_mutex); |
1490 | if (consumer_data->pid == 0) { | |
712ea556 | 1491 | ERR("Kconsumerd did not start"); |
3bd1e081 | 1492 | pthread_mutex_unlock(&consumer_data->pid_mutex); |
712ea556 DG |
1493 | goto error; |
1494 | } | |
3bd1e081 | 1495 | pthread_mutex_unlock(&consumer_data->pid_mutex); |
712ea556 | 1496 | |
8c0faa1d DG |
1497 | return 0; |
1498 | ||
1499 | error: | |
1500 | return ret; | |
1501 | } | |
1502 | ||
d9800920 | 1503 | /* |
3bd1e081 | 1504 | * Join consumer thread |
d9800920 | 1505 | */ |
3bd1e081 | 1506 | static int join_consumer_thread(struct consumer_data *consumer_data) |
cf3af59e MD |
1507 | { |
1508 | void *status; | |
1509 | int ret; | |
1510 | ||
3bd1e081 MD |
1511 | if (consumer_data->pid != 0) { |
1512 | ret = kill(consumer_data->pid, SIGTERM); | |
cf3af59e | 1513 | if (ret) { |
3bd1e081 | 1514 | ERR("Error killing consumer daemon"); |
cf3af59e MD |
1515 | return ret; |
1516 | } | |
3bd1e081 | 1517 | return pthread_join(consumer_data->thread, &status); |
cf3af59e MD |
1518 | } else { |
1519 | return 0; | |
1520 | } | |
1521 | } | |
1522 | ||
8c0faa1d | 1523 | /* |
3bd1e081 | 1524 | * Fork and exec a consumer daemon (consumerd). |
8c0faa1d | 1525 | * |
d063d709 | 1526 | * Return pid if successful else -1. |
8c0faa1d | 1527 | */ |
3bd1e081 | 1528 | static pid_t spawn_consumerd(struct consumer_data *consumer_data) |
8c0faa1d DG |
1529 | { |
1530 | int ret; | |
1531 | pid_t pid; | |
94c55f17 | 1532 | const char *consumer_to_use; |
53086306 | 1533 | const char *verbosity; |
94c55f17 | 1534 | struct stat st; |
8c0faa1d | 1535 | |
3bd1e081 | 1536 | DBG("Spawning consumerd"); |
c49dc785 | 1537 | |
8c0faa1d DG |
1538 | pid = fork(); |
1539 | if (pid == 0) { | |
1540 | /* | |
3bd1e081 | 1541 | * Exec consumerd. |
8c0faa1d | 1542 | */ |
daee5345 | 1543 | if (opt_verbose_consumer) { |
53086306 DG |
1544 | verbosity = "--verbose"; |
1545 | } else { | |
1546 | verbosity = "--quiet"; | |
1547 | } | |
3bd1e081 MD |
1548 | switch (consumer_data->type) { |
1549 | case LTTNG_CONSUMER_KERNEL: | |
94c55f17 | 1550 | /* |
c7704d57 DG |
1551 | * Find out which consumerd to execute. We will first try the |
1552 | * 64-bit path, then the sessiond's installation directory, and | |
1553 | * fallback on the 32-bit one, | |
94c55f17 | 1554 | */ |
63a799e8 AM |
1555 | DBG3("Looking for a kernel consumer at these locations:"); |
1556 | DBG3(" 1) %s", consumerd64_bin); | |
1557 | DBG3(" 2) %s/%s", INSTALL_BIN_PATH, CONSUMERD_FILE); | |
1558 | DBG3(" 3) %s", consumerd32_bin); | |
94c55f17 | 1559 | if (stat(consumerd64_bin, &st) == 0) { |
63a799e8 | 1560 | DBG3("Found location #1"); |
94c55f17 | 1561 | consumer_to_use = consumerd64_bin; |
94c55f17 | 1562 | } else if (stat(INSTALL_BIN_PATH "/" CONSUMERD_FILE, &st) == 0) { |
63a799e8 | 1563 | DBG3("Found location #2"); |
94c55f17 | 1564 | consumer_to_use = INSTALL_BIN_PATH "/" CONSUMERD_FILE; |
eb1e0bd4 | 1565 | } else if (stat(consumerd32_bin, &st) == 0) { |
63a799e8 | 1566 | DBG3("Found location #3"); |
eb1e0bd4 | 1567 | consumer_to_use = consumerd32_bin; |
94c55f17 | 1568 | } else { |
63a799e8 | 1569 | DBG("Could not find any valid consumerd executable"); |
94c55f17 AM |
1570 | break; |
1571 | } | |
1572 | DBG("Using kernel consumer at: %s", consumer_to_use); | |
1573 | execl(consumer_to_use, | |
1574 | "lttng-consumerd", verbosity, "-k", | |
1575 | "--consumerd-cmd-sock", consumer_data->cmd_unix_sock_path, | |
1576 | "--consumerd-err-sock", consumer_data->err_unix_sock_path, | |
1577 | NULL); | |
3bd1e081 | 1578 | break; |
7753dea8 MD |
1579 | case LTTNG_CONSUMER64_UST: |
1580 | { | |
b1e0b6b6 | 1581 | char *tmpnew = NULL; |
8f4905da MD |
1582 | |
1583 | if (consumerd64_libdir[0] != '\0') { | |
1584 | char *tmp; | |
1585 | size_t tmplen; | |
1586 | ||
1587 | tmp = getenv("LD_LIBRARY_PATH"); | |
1588 | if (!tmp) { | |
1589 | tmp = ""; | |
1590 | } | |
1591 | tmplen = strlen("LD_LIBRARY_PATH=") | |
1592 | + strlen(consumerd64_libdir) + 1 /* : */ + strlen(tmp); | |
1593 | tmpnew = zmalloc(tmplen + 1 /* \0 */); | |
1594 | if (!tmpnew) { | |
1595 | ret = -ENOMEM; | |
1596 | goto error; | |
1597 | } | |
1598 | strcpy(tmpnew, "LD_LIBRARY_PATH="); | |
1599 | strcat(tmpnew, consumerd64_libdir); | |
1600 | if (tmp[0] != '\0') { | |
1601 | strcat(tmpnew, ":"); | |
1602 | strcat(tmpnew, tmp); | |
1603 | } | |
1604 | ret = putenv(tmpnew); | |
1605 | if (ret) { | |
1606 | ret = -errno; | |
1607 | goto error; | |
1608 | } | |
1609 | } | |
94c55f17 | 1610 | DBG("Using 64-bit UST consumer at: %s", consumerd64_bin); |
a5a6aff3 | 1611 | ret = execl(consumerd64_bin, "lttng-consumerd", verbosity, "-u", |
7753dea8 MD |
1612 | "--consumerd-cmd-sock", consumer_data->cmd_unix_sock_path, |
1613 | "--consumerd-err-sock", consumer_data->err_unix_sock_path, | |
1614 | NULL); | |
8f4905da MD |
1615 | if (consumerd64_libdir[0] != '\0') { |
1616 | free(tmpnew); | |
1617 | } | |
1618 | if (ret) { | |
1619 | goto error; | |
1620 | } | |
3bd1e081 | 1621 | break; |
7753dea8 MD |
1622 | } |
1623 | case LTTNG_CONSUMER32_UST: | |
1624 | { | |
937dde8e | 1625 | char *tmpnew = NULL; |
8f4905da MD |
1626 | |
1627 | if (consumerd32_libdir[0] != '\0') { | |
1628 | char *tmp; | |
1629 | size_t tmplen; | |
1630 | ||
1631 | tmp = getenv("LD_LIBRARY_PATH"); | |
1632 | if (!tmp) { | |
1633 | tmp = ""; | |
1634 | } | |
1635 | tmplen = strlen("LD_LIBRARY_PATH=") | |
1636 | + strlen(consumerd32_libdir) + 1 /* : */ + strlen(tmp); | |
1637 | tmpnew = zmalloc(tmplen + 1 /* \0 */); | |
1638 | if (!tmpnew) { | |
1639 | ret = -ENOMEM; | |
1640 | goto error; | |
1641 | } | |
1642 | strcpy(tmpnew, "LD_LIBRARY_PATH="); | |
1643 | strcat(tmpnew, consumerd32_libdir); | |
1644 | if (tmp[0] != '\0') { | |
1645 | strcat(tmpnew, ":"); | |
1646 | strcat(tmpnew, tmp); | |
1647 | } | |
1648 | ret = putenv(tmpnew); | |
1649 | if (ret) { | |
1650 | ret = -errno; | |
1651 | goto error; | |
1652 | } | |
1653 | } | |
94c55f17 | 1654 | DBG("Using 32-bit UST consumer at: %s", consumerd32_bin); |
a5a6aff3 | 1655 | ret = execl(consumerd32_bin, "lttng-consumerd", verbosity, "-u", |
7753dea8 MD |
1656 | "--consumerd-cmd-sock", consumer_data->cmd_unix_sock_path, |
1657 | "--consumerd-err-sock", consumer_data->err_unix_sock_path, | |
1658 | NULL); | |
8f4905da MD |
1659 | if (consumerd32_libdir[0] != '\0') { |
1660 | free(tmpnew); | |
1661 | } | |
1662 | if (ret) { | |
1663 | goto error; | |
1664 | } | |
7753dea8 MD |
1665 | break; |
1666 | } | |
3bd1e081 MD |
1667 | default: |
1668 | perror("unknown consumer type"); | |
1669 | exit(EXIT_FAILURE); | |
1670 | } | |
8c0faa1d DG |
1671 | if (errno != 0) { |
1672 | perror("kernel start consumer exec"); | |
1673 | } | |
1674 | exit(EXIT_FAILURE); | |
1675 | } else if (pid > 0) { | |
1676 | ret = pid; | |
8c0faa1d | 1677 | } else { |
3bd1e081 | 1678 | perror("start consumer fork"); |
8c0faa1d | 1679 | ret = -errno; |
8c0faa1d | 1680 | } |
8f4905da | 1681 | error: |
8c0faa1d DG |
1682 | return ret; |
1683 | } | |
1684 | ||
693bd40b | 1685 | /* |
3bd1e081 | 1686 | * Spawn the consumerd daemon and session daemon thread. |
693bd40b | 1687 | */ |
3bd1e081 | 1688 | static int start_consumerd(struct consumer_data *consumer_data) |
693bd40b DG |
1689 | { |
1690 | int ret; | |
1691 | ||
3bd1e081 MD |
1692 | pthread_mutex_lock(&consumer_data->pid_mutex); |
1693 | if (consumer_data->pid != 0) { | |
1694 | pthread_mutex_unlock(&consumer_data->pid_mutex); | |
c49dc785 DG |
1695 | goto end; |
1696 | } | |
693bd40b | 1697 | |
3bd1e081 | 1698 | ret = spawn_consumerd(consumer_data); |
c49dc785 | 1699 | if (ret < 0) { |
3bd1e081 MD |
1700 | ERR("Spawning consumerd failed"); |
1701 | pthread_mutex_unlock(&consumer_data->pid_mutex); | |
c49dc785 | 1702 | goto error; |
693bd40b | 1703 | } |
c49dc785 | 1704 | |
3bd1e081 MD |
1705 | /* Setting up the consumer_data pid */ |
1706 | consumer_data->pid = ret; | |
48842b30 | 1707 | DBG2("Consumer pid %d", consumer_data->pid); |
3bd1e081 | 1708 | pthread_mutex_unlock(&consumer_data->pid_mutex); |
693bd40b | 1709 | |
3bd1e081 MD |
1710 | DBG2("Spawning consumer control thread"); |
1711 | ret = spawn_consumer_thread(consumer_data); | |
693bd40b | 1712 | if (ret < 0) { |
3bd1e081 | 1713 | ERR("Fatal error spawning consumer control thread"); |
693bd40b DG |
1714 | goto error; |
1715 | } | |
1716 | ||
c49dc785 | 1717 | end: |
693bd40b DG |
1718 | return 0; |
1719 | ||
1720 | error: | |
1721 | return ret; | |
1722 | } | |
1723 | ||
b73401da | 1724 | /* |
096102bd | 1725 | * Check version of the lttng-modules. |
b73401da | 1726 | */ |
096102bd | 1727 | static int validate_lttng_modules_version(void) |
b73401da | 1728 | { |
096102bd | 1729 | return kernel_validate_version(kernel_tracer_fd); |
ab147185 MD |
1730 | } |
1731 | ||
b73401da | 1732 | /* |
096102bd | 1733 | * Setup necessary data for kernel tracer action. |
b73401da | 1734 | */ |
096102bd | 1735 | static int init_kernel_tracer(void) |
b73401da DG |
1736 | { |
1737 | int ret; | |
b73401da | 1738 | |
096102bd DG |
1739 | /* Modprobe lttng kernel modules */ |
1740 | ret = modprobe_lttng_control(); | |
b73401da | 1741 | if (ret < 0) { |
b73401da DG |
1742 | goto error; |
1743 | } | |
1744 | ||
096102bd DG |
1745 | /* Open debugfs lttng */ |
1746 | kernel_tracer_fd = open(module_proc_lttng, O_RDWR); | |
1747 | if (kernel_tracer_fd < 0) { | |
1748 | DBG("Failed to open %s", module_proc_lttng); | |
1749 | ret = -1; | |
1750 | goto error_open; | |
b73401da DG |
1751 | } |
1752 | ||
096102bd DG |
1753 | /* Validate kernel version */ |
1754 | ret = validate_lttng_modules_version(); | |
b73401da | 1755 | if (ret < 0) { |
096102bd | 1756 | goto error_version; |
b73401da DG |
1757 | } |
1758 | ||
096102bd | 1759 | ret = modprobe_lttng_data(); |
b73401da | 1760 | if (ret < 0) { |
096102bd | 1761 | goto error_modules; |
8c0faa1d DG |
1762 | } |
1763 | ||
f3ed775e | 1764 | DBG("Kernel tracer fd %d", kernel_tracer_fd); |
096102bd DG |
1765 | return 0; |
1766 | ||
1767 | error_version: | |
1768 | modprobe_remove_lttng_control(); | |
1769 | close(kernel_tracer_fd); | |
1770 | kernel_tracer_fd = 0; | |
1771 | return LTTCOMM_KERN_VERSION; | |
1772 | ||
1773 | error_modules: | |
1774 | close(kernel_tracer_fd); | |
1775 | ||
1776 | error_open: | |
1777 | modprobe_remove_lttng_control(); | |
b73401da DG |
1778 | |
1779 | error: | |
b73401da | 1780 | WARN("No kernel tracer available"); |
a4b35e07 | 1781 | kernel_tracer_fd = -1; |
096102bd | 1782 | return LTTCOMM_KERN_NA; |
f3ed775e | 1783 | } |
33a2b854 | 1784 | |
f3ed775e | 1785 | /* |
54d01ffb | 1786 | * Init tracing by creating trace directory and sending fds kernel consumer. |
f3ed775e | 1787 | */ |
54d01ffb | 1788 | static int init_kernel_tracing(struct ltt_kernel_session *session) |
f3ed775e | 1789 | { |
f40799e8 | 1790 | int ret = 0; |
8c0faa1d | 1791 | |
3bd1e081 | 1792 | if (session->consumer_fds_sent == 0) { |
d9800920 | 1793 | /* |
54d01ffb DG |
1794 | * Assign default kernel consumer socket if no consumer assigned to the |
1795 | * kernel session. At this point, it's NOT suppose to be 0 but this is | |
1796 | * an extra security check. | |
d9800920 DG |
1797 | */ |
1798 | if (session->consumer_fd == 0) { | |
3bd1e081 | 1799 | session->consumer_fd = kconsumer_data.cmd_sock; |
d9800920 DG |
1800 | } |
1801 | ||
2bdd86d4 | 1802 | ret = send_kconsumer_session_streams(&kconsumer_data, session); |
f3ed775e | 1803 | if (ret < 0) { |
f3ed775e DG |
1804 | ret = LTTCOMM_KERN_CONSUMER_FAIL; |
1805 | goto error; | |
1806 | } | |
1d4b027a | 1807 | |
3bd1e081 | 1808 | session->consumer_fds_sent = 1; |
f3ed775e | 1809 | } |
1d4b027a DG |
1810 | |
1811 | error: | |
1812 | return ret; | |
8c0faa1d DG |
1813 | } |
1814 | ||
0177d773 DG |
1815 | /* |
1816 | * Create an UST session and add it to the session ust list. | |
1817 | */ | |
44d3bd01 | 1818 | static int create_ust_session(struct ltt_session *session, |
6df2e2c9 | 1819 | struct lttng_domain *domain) |
0177d773 | 1820 | { |
13384287 | 1821 | struct ltt_ust_session *lus = NULL; |
6df2e2c9 | 1822 | int ret; |
44d3bd01 DG |
1823 | |
1824 | switch (domain->type) { | |
48842b30 | 1825 | case LTTNG_DOMAIN_UST: |
44d3bd01 DG |
1826 | break; |
1827 | default: | |
13384287 | 1828 | ret = LTTCOMM_UNKNOWN_DOMAIN; |
44d3bd01 DG |
1829 | goto error; |
1830 | } | |
0177d773 DG |
1831 | |
1832 | DBG("Creating UST session"); | |
1833 | ||
a991f516 | 1834 | lus = trace_ust_create_session(session->path, session->id, domain); |
0177d773 | 1835 | if (lus == NULL) { |
44d3bd01 | 1836 | ret = LTTCOMM_UST_SESS_FAIL; |
0177d773 DG |
1837 | goto error; |
1838 | } | |
1839 | ||
e11d277b | 1840 | ret = run_as_mkdir_recursive(lus->pathname, S_IRWXU | S_IRWXG, |
6df2e2c9 | 1841 | session->uid, session->gid); |
0177d773 DG |
1842 | if (ret < 0) { |
1843 | if (ret != -EEXIST) { | |
1844 | ERR("Trace directory creation error"); | |
44d3bd01 | 1845 | ret = LTTCOMM_UST_SESS_FAIL; |
0177d773 DG |
1846 | goto error; |
1847 | } | |
1848 | } | |
1849 | ||
f6a9efaa DG |
1850 | /* The domain type dictate different actions on session creation */ |
1851 | switch (domain->type) { | |
48842b30 DG |
1852 | case LTTNG_DOMAIN_UST: |
1853 | /* No ustctl for the global UST domain */ | |
1854 | break; | |
1855 | default: | |
36dc12cc | 1856 | ERR("Unknown UST domain on create session %d", domain->type); |
48842b30 | 1857 | goto error; |
0177d773 | 1858 | } |
6df2e2c9 MD |
1859 | lus->uid = session->uid; |
1860 | lus->gid = session->gid; | |
f6a9efaa | 1861 | session->ust_session = lus; |
44d3bd01 DG |
1862 | |
1863 | return LTTCOMM_OK; | |
0177d773 DG |
1864 | |
1865 | error: | |
1866 | free(lus); | |
1867 | return ret; | |
1868 | } | |
1869 | ||
333f285e | 1870 | /* |
d063d709 | 1871 | * Create a kernel tracer session then create the default channel. |
333f285e | 1872 | */ |
6df2e2c9 | 1873 | static int create_kernel_session(struct ltt_session *session) |
333f285e | 1874 | { |
f3ed775e | 1875 | int ret; |
f3ed775e DG |
1876 | |
1877 | DBG("Creating kernel session"); | |
1878 | ||
1879 | ret = kernel_create_session(session, kernel_tracer_fd); | |
1880 | if (ret < 0) { | |
1881 | ret = LTTCOMM_KERN_SESS_FAIL; | |
1882 | goto error; | |
333f285e DG |
1883 | } |
1884 | ||
d9800920 | 1885 | /* Set kernel consumer socket fd */ |
3bd1e081 MD |
1886 | if (kconsumer_data.cmd_sock) { |
1887 | session->kernel_session->consumer_fd = kconsumer_data.cmd_sock; | |
d9800920 DG |
1888 | } |
1889 | ||
e11d277b | 1890 | ret = run_as_mkdir_recursive(session->kernel_session->trace_path, |
6df2e2c9 | 1891 | S_IRWXU | S_IRWXG, session->uid, session->gid); |
7a485870 | 1892 | if (ret < 0) { |
996b65c8 | 1893 | if (ret != -EEXIST) { |
7a485870 DG |
1894 | ERR("Trace directory creation error"); |
1895 | goto error; | |
1896 | } | |
1897 | } | |
6df2e2c9 MD |
1898 | session->kernel_session->uid = session->uid; |
1899 | session->kernel_session->gid = session->gid; | |
7a485870 | 1900 | |
f3ed775e DG |
1901 | error: |
1902 | return ret; | |
333f285e DG |
1903 | } |
1904 | ||
8e0af1b4 | 1905 | /* |
c7704d57 DG |
1906 | * Check if the UID or GID match the session. Root user has access to all |
1907 | * sessions. | |
8e0af1b4 | 1908 | */ |
c7704d57 | 1909 | static int session_access_ok(struct ltt_session *session, uid_t uid, gid_t gid) |
8e0af1b4 | 1910 | { |
c7704d57 | 1911 | if (uid != session->uid && gid != session->gid && uid != 0) { |
8e0af1b4 MD |
1912 | return 0; |
1913 | } else { | |
1914 | return 1; | |
1915 | } | |
1916 | } | |
1917 | ||
1918 | static unsigned int lttng_sessions_count(uid_t uid, gid_t gid) | |
1919 | { | |
1920 | unsigned int i = 0; | |
1921 | struct ltt_session *session; | |
1922 | ||
1923 | DBG("Counting number of available session for UID %d GID %d", | |
1924 | uid, gid); | |
1925 | cds_list_for_each_entry(session, &session_list_ptr->head, list) { | |
1926 | /* | |
1927 | * Only list the sessions the user can control. | |
1928 | */ | |
1929 | if (!session_access_ok(session, uid, gid)) { | |
1930 | continue; | |
1931 | } | |
1932 | i++; | |
1933 | } | |
1934 | return i; | |
1935 | } | |
1936 | ||
6c9cc2ab DG |
1937 | /* |
1938 | * Using the session list, filled a lttng_session array to send back to the | |
1939 | * client for session listing. | |
1940 | * | |
1941 | * The session list lock MUST be acquired before calling this function. Use | |
54d01ffb | 1942 | * session_lock_list() and session_unlock_list(). |
6c9cc2ab | 1943 | */ |
c7704d57 DG |
1944 | static void list_lttng_sessions(struct lttng_session *sessions, uid_t uid, |
1945 | gid_t gid) | |
6c9cc2ab | 1946 | { |
8e0af1b4 | 1947 | unsigned int i = 0; |
6c9cc2ab DG |
1948 | struct ltt_session *session; |
1949 | ||
8e0af1b4 MD |
1950 | DBG("Getting all available session for UID %d GID %d", |
1951 | uid, gid); | |
6c9cc2ab DG |
1952 | /* |
1953 | * Iterate over session list and append data after the control struct in | |
1954 | * the buffer. | |
1955 | */ | |
1956 | cds_list_for_each_entry(session, &session_list_ptr->head, list) { | |
8e0af1b4 MD |
1957 | /* |
1958 | * Only list the sessions the user can control. | |
1959 | */ | |
1960 | if (!session_access_ok(session, uid, gid)) { | |
1961 | continue; | |
1962 | } | |
6c9cc2ab | 1963 | strncpy(sessions[i].path, session->path, PATH_MAX); |
99497cd0 | 1964 | sessions[i].path[PATH_MAX - 1] = '\0'; |
6c9cc2ab | 1965 | strncpy(sessions[i].name, session->name, NAME_MAX); |
99497cd0 | 1966 | sessions[i].name[NAME_MAX - 1] = '\0'; |
464dd62d | 1967 | sessions[i].enabled = session->enabled; |
6c9cc2ab DG |
1968 | i++; |
1969 | } | |
1970 | } | |
1971 | ||
9f19cc17 DG |
1972 | /* |
1973 | * Fill lttng_channel array of all channels. | |
1974 | */ | |
b551a063 | 1975 | static void list_lttng_channels(int domain, struct ltt_session *session, |
9f19cc17 DG |
1976 | struct lttng_channel *channels) |
1977 | { | |
1978 | int i = 0; | |
1979 | struct ltt_kernel_channel *kchan; | |
1980 | ||
1981 | DBG("Listing channels for session %s", session->name); | |
1982 | ||
b551a063 DG |
1983 | switch (domain) { |
1984 | case LTTNG_DOMAIN_KERNEL: | |
1985 | /* Kernel channels */ | |
1986 | if (session->kernel_session != NULL) { | |
1987 | cds_list_for_each_entry(kchan, | |
1988 | &session->kernel_session->channel_list.head, list) { | |
1989 | /* Copy lttng_channel struct to array */ | |
1990 | memcpy(&channels[i], kchan->channel, sizeof(struct lttng_channel)); | |
1991 | channels[i].enabled = kchan->enabled; | |
1992 | i++; | |
1993 | } | |
1994 | } | |
1995 | break; | |
1996 | case LTTNG_DOMAIN_UST: | |
1997 | { | |
bec39940 | 1998 | struct lttng_ht_iter iter; |
b551a063 DG |
1999 | struct ltt_ust_channel *uchan; |
2000 | ||
bec39940 DG |
2001 | cds_lfht_for_each_entry(session->ust_session->domain_global.channels->ht, |
2002 | &iter.iter, uchan, node.node) { | |
b551a063 DG |
2003 | strncpy(channels[i].name, uchan->name, LTTNG_SYMBOL_NAME_LEN); |
2004 | channels[i].attr.overwrite = uchan->attr.overwrite; | |
2005 | channels[i].attr.subbuf_size = uchan->attr.subbuf_size; | |
2006 | channels[i].attr.num_subbuf = uchan->attr.num_subbuf; | |
2007 | channels[i].attr.switch_timer_interval = | |
2008 | uchan->attr.switch_timer_interval; | |
2009 | channels[i].attr.read_timer_interval = | |
2010 | uchan->attr.read_timer_interval; | |
aea829b3 | 2011 | channels[i].enabled = uchan->enabled; |
5edd7e09 DG |
2012 | switch (uchan->attr.output) { |
2013 | case LTTNG_UST_MMAP: | |
2014 | default: | |
2015 | channels[i].attr.output = LTTNG_EVENT_MMAP; | |
2016 | break; | |
2017 | } | |
befe0905 | 2018 | i++; |
b551a063 DG |
2019 | } |
2020 | break; | |
2021 | } | |
2022 | default: | |
2023 | break; | |
2024 | } | |
2025 | } | |
2026 | ||
2027 | /* | |
2028 | * Create a list of ust global domain events. | |
2029 | */ | |
2030 | static int list_lttng_ust_global_events(char *channel_name, | |
2031 | struct ltt_ust_domain_global *ust_global, struct lttng_event **events) | |
2032 | { | |
2033 | int i = 0, ret = 0; | |
2034 | unsigned int nb_event = 0; | |
bec39940 DG |
2035 | struct lttng_ht_iter iter; |
2036 | struct lttng_ht_node_str *node; | |
b551a063 DG |
2037 | struct ltt_ust_channel *uchan; |
2038 | struct ltt_ust_event *uevent; | |
2039 | struct lttng_event *tmp; | |
2040 | ||
2041 | DBG("Listing UST global events for channel %s", channel_name); | |
2042 | ||
2043 | rcu_read_lock(); | |
2044 | ||
bec39940 DG |
2045 | lttng_ht_lookup(ust_global->channels, (void *)channel_name, &iter); |
2046 | node = lttng_ht_iter_get_node_str(&iter); | |
d7b75b30 DG |
2047 | if (node == NULL) { |
2048 | ret = -LTTCOMM_UST_CHAN_NOT_FOUND; | |
2049 | goto error; | |
b551a063 DG |
2050 | } |
2051 | ||
bec39940 | 2052 | uchan = caa_container_of(&node->node, struct ltt_ust_channel, node.node); |
d7b75b30 | 2053 | |
bec39940 | 2054 | nb_event += lttng_ht_get_count(uchan->events); |
d7b75b30 | 2055 | |
b551a063 DG |
2056 | if (nb_event == 0) { |
2057 | ret = nb_event; | |
2058 | goto error; | |
2059 | } | |
2060 | ||
2061 | DBG3("Listing UST global %d events", nb_event); | |
2062 | ||
2063 | tmp = zmalloc(nb_event * sizeof(struct lttng_event)); | |
2064 | if (tmp == NULL) { | |
2065 | ret = -LTTCOMM_FATAL; | |
2066 | goto error; | |
2067 | } | |
2068 | ||
bec39940 | 2069 | cds_lfht_for_each_entry(uchan->events->ht, &iter.iter, uevent, node.node) { |
d7b75b30 DG |
2070 | strncpy(tmp[i].name, uevent->attr.name, LTTNG_SYMBOL_NAME_LEN); |
2071 | tmp[i].name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0'; | |
2072 | tmp[i].enabled = uevent->enabled; | |
2073 | switch (uevent->attr.instrumentation) { | |
2074 | case LTTNG_UST_TRACEPOINT: | |
2075 | tmp[i].type = LTTNG_EVENT_TRACEPOINT; | |
2076 | break; | |
2077 | case LTTNG_UST_PROBE: | |
2078 | tmp[i].type = LTTNG_EVENT_PROBE; | |
2079 | break; | |
2080 | case LTTNG_UST_FUNCTION: | |
2081 | tmp[i].type = LTTNG_EVENT_FUNCTION; | |
2082 | break; | |
0cda4f28 | 2083 | } |
8005f29a | 2084 | tmp[i].loglevel = uevent->attr.loglevel; |
0cda4f28 | 2085 | switch (uevent->attr.loglevel_type) { |
8005f29a | 2086 | case LTTNG_UST_LOGLEVEL_ALL: |
22e25b71 | 2087 | tmp[i].loglevel_type = LTTNG_EVENT_LOGLEVEL_ALL; |
0cda4f28 | 2088 | break; |
8005f29a | 2089 | case LTTNG_UST_LOGLEVEL_RANGE: |
22e25b71 | 2090 | tmp[i].loglevel_type = LTTNG_EVENT_LOGLEVEL_RANGE; |
8005f29a MD |
2091 | break; |
2092 | case LTTNG_UST_LOGLEVEL_SINGLE: | |
22e25b71 | 2093 | tmp[i].loglevel_type = LTTNG_EVENT_LOGLEVEL_SINGLE; |
ac3bd9c0 | 2094 | break; |
9f19cc17 | 2095 | } |
d7b75b30 | 2096 | i++; |
9f19cc17 DG |
2097 | } |
2098 | ||
b551a063 DG |
2099 | ret = nb_event; |
2100 | *events = tmp; | |
2101 | ||
2102 | error: | |
2103 | rcu_read_unlock(); | |
2104 | return ret; | |
9f19cc17 DG |
2105 | } |
2106 | ||
2107 | /* | |
b551a063 | 2108 | * Fill lttng_event array of all kernel events in the channel. |
9f19cc17 | 2109 | */ |
b551a063 DG |
2110 | static int list_lttng_kernel_events(char *channel_name, |
2111 | struct ltt_kernel_session *kernel_session, struct lttng_event **events) | |
9f19cc17 | 2112 | { |
b551a063 DG |
2113 | int i = 0, ret; |
2114 | unsigned int nb_event; | |
9f19cc17 | 2115 | struct ltt_kernel_event *event; |
b551a063 DG |
2116 | struct ltt_kernel_channel *kchan; |
2117 | ||
2118 | kchan = trace_kernel_get_channel_by_name(channel_name, kernel_session); | |
2119 | if (kchan == NULL) { | |
2120 | ret = LTTCOMM_KERN_CHAN_NOT_FOUND; | |
2121 | goto error; | |
2122 | } | |
2123 | ||
2124 | nb_event = kchan->event_count; | |
9f19cc17 DG |
2125 | |
2126 | DBG("Listing events for channel %s", kchan->channel->name); | |
2127 | ||
b551a063 DG |
2128 | if (nb_event == 0) { |
2129 | ret = nb_event; | |
2130 | goto error; | |
2131 | } | |
2132 | ||
2133 | *events = zmalloc(nb_event * sizeof(struct lttng_event)); | |
2134 | if (*events == NULL) { | |
2135 | ret = LTTCOMM_FATAL; | |
2136 | goto error; | |
2137 | } | |
2138 | ||
9f19cc17 DG |
2139 | /* Kernel channels */ |
2140 | cds_list_for_each_entry(event, &kchan->events_list.head , list) { | |
b551a063 DG |
2141 | strncpy((*events)[i].name, event->event->name, LTTNG_SYMBOL_NAME_LEN); |
2142 | (*events)[i].name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0'; | |
2143 | (*events)[i].enabled = event->enabled; | |
9f19cc17 DG |
2144 | switch (event->event->instrumentation) { |
2145 | case LTTNG_KERNEL_TRACEPOINT: | |
b551a063 | 2146 | (*events)[i].type = LTTNG_EVENT_TRACEPOINT; |
9f19cc17 DG |
2147 | break; |
2148 | case LTTNG_KERNEL_KPROBE: | |
2149 | case LTTNG_KERNEL_KRETPROBE: | |
b551a063 DG |
2150 | (*events)[i].type = LTTNG_EVENT_PROBE; |
2151 | memcpy(&(*events)[i].attr.probe, &event->event->u.kprobe, | |
9f19cc17 DG |
2152 | sizeof(struct lttng_kernel_kprobe)); |
2153 | break; | |
2154 | case LTTNG_KERNEL_FUNCTION: | |
b551a063 DG |
2155 | (*events)[i].type = LTTNG_EVENT_FUNCTION; |
2156 | memcpy(&((*events)[i].attr.ftrace), &event->event->u.ftrace, | |
9f19cc17 DG |
2157 | sizeof(struct lttng_kernel_function)); |
2158 | break; | |
0133c199 | 2159 | case LTTNG_KERNEL_NOOP: |
b551a063 | 2160 | (*events)[i].type = LTTNG_EVENT_NOOP; |
0133c199 | 2161 | break; |
a54bd42d | 2162 | case LTTNG_KERNEL_SYSCALL: |
b551a063 | 2163 | (*events)[i].type = LTTNG_EVENT_SYSCALL; |
0133c199 | 2164 | break; |
7a3d1328 MD |
2165 | case LTTNG_KERNEL_ALL: |
2166 | assert(0); | |
2167 | break; | |
9f19cc17 DG |
2168 | } |
2169 | i++; | |
2170 | } | |
b551a063 DG |
2171 | |
2172 | return nb_event; | |
2173 | ||
2174 | error: | |
2175 | return ret; | |
9f19cc17 DG |
2176 | } |
2177 | ||
fac6795d | 2178 | /* |
54d01ffb | 2179 | * Command LTTNG_DISABLE_CHANNEL processed by the client thread. |
fac6795d | 2180 | */ |
54d01ffb DG |
2181 | static int cmd_disable_channel(struct ltt_session *session, |
2182 | int domain, char *channel_name) | |
fac6795d | 2183 | { |
54d01ffb | 2184 | int ret; |
78f0bacd DG |
2185 | struct ltt_ust_session *usess; |
2186 | ||
2187 | usess = session->ust_session; | |
379473d2 | 2188 | |
54d01ffb | 2189 | switch (domain) { |
78f0bacd DG |
2190 | case LTTNG_DOMAIN_KERNEL: |
2191 | { | |
2192 | ret = channel_kernel_disable(session->kernel_session, | |
2193 | channel_name); | |
2194 | if (ret != LTTCOMM_OK) { | |
2195 | goto error; | |
2196 | } | |
54d01ffb | 2197 | |
78f0bacd DG |
2198 | kernel_wait_quiescent(kernel_tracer_fd); |
2199 | break; | |
2200 | } | |
2201 | case LTTNG_DOMAIN_UST: | |
2202 | { | |
2203 | struct ltt_ust_channel *uchan; | |
bec39940 | 2204 | struct lttng_ht *chan_ht; |
78f0bacd | 2205 | |
7885e399 DG |
2206 | chan_ht = usess->domain_global.channels; |
2207 | ||
2208 | uchan = trace_ust_find_channel_by_name(chan_ht, channel_name); | |
78f0bacd DG |
2209 | if (uchan == NULL) { |
2210 | ret = LTTCOMM_UST_CHAN_NOT_FOUND; | |
54d01ffb | 2211 | goto error; |
78f0bacd DG |
2212 | } |
2213 | ||
7885e399 DG |
2214 | ret = channel_ust_disable(usess, domain, uchan); |
2215 | if (ret != LTTCOMM_OK) { | |
78f0bacd DG |
2216 | goto error; |
2217 | } | |
78f0bacd DG |
2218 | break; |
2219 | } | |
d78d6610 | 2220 | #if 0 |
78f0bacd DG |
2221 | case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN: |
2222 | case LTTNG_DOMAIN_UST_EXEC_NAME: | |
2223 | case LTTNG_DOMAIN_UST_PID: | |
d78d6610 | 2224 | #endif |
78f0bacd DG |
2225 | default: |
2226 | ret = LTTCOMM_UNKNOWN_DOMAIN; | |
2227 | goto error; | |
20fe2104 DG |
2228 | } |
2229 | ||
54d01ffb | 2230 | ret = LTTCOMM_OK; |
d65106b1 | 2231 | |
54d01ffb DG |
2232 | error: |
2233 | return ret; | |
2234 | } | |
2235 | ||
2236 | /* | |
2237 | * Command LTTNG_ENABLE_CHANNEL processed by the client thread. | |
2238 | */ | |
44d3bd01 | 2239 | static int cmd_enable_channel(struct ltt_session *session, |
aea829b3 | 2240 | int domain, struct lttng_channel *attr) |
54d01ffb DG |
2241 | { |
2242 | int ret; | |
f6a9efaa | 2243 | struct ltt_ust_session *usess = session->ust_session; |
bec39940 | 2244 | struct lttng_ht *chan_ht; |
f6a9efaa | 2245 | |
5d56b5aa | 2246 | DBG("Enabling channel %s for session %s", attr->name, session->name); |
d65106b1 | 2247 | |
aea829b3 | 2248 | switch (domain) { |
44d3bd01 DG |
2249 | case LTTNG_DOMAIN_KERNEL: |
2250 | { | |
2251 | struct ltt_kernel_channel *kchan; | |
54d01ffb | 2252 | |
44d3bd01 DG |
2253 | kchan = trace_kernel_get_channel_by_name(attr->name, |
2254 | session->kernel_session); | |
2255 | if (kchan == NULL) { | |
2256 | ret = channel_kernel_create(session->kernel_session, | |
2257 | attr, kernel_poll_pipe[1]); | |
2258 | } else { | |
2259 | ret = channel_kernel_enable(session->kernel_session, kchan); | |
2260 | } | |
2261 | ||
2262 | if (ret != LTTCOMM_OK) { | |
2263 | goto error; | |
2264 | } | |
2265 | ||
2266 | kernel_wait_quiescent(kernel_tracer_fd); | |
2267 | break; | |
2268 | } | |
f6a9efaa DG |
2269 | case LTTNG_DOMAIN_UST: |
2270 | { | |
2271 | struct ltt_ust_channel *uchan; | |
2272 | ||
7885e399 | 2273 | chan_ht = usess->domain_global.channels; |
f6a9efaa | 2274 | |
7885e399 | 2275 | uchan = trace_ust_find_channel_by_name(chan_ht, attr->name); |
f6a9efaa | 2276 | if (uchan == NULL) { |
7885e399 | 2277 | ret = channel_ust_create(usess, domain, attr); |
f6a9efaa | 2278 | } else { |
7885e399 | 2279 | ret = channel_ust_enable(usess, domain, uchan); |
48842b30 | 2280 | } |
f6a9efaa DG |
2281 | break; |
2282 | } | |
d78d6610 | 2283 | #if 0 |
78f0bacd DG |
2284 | case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN: |
2285 | case LTTNG_DOMAIN_UST_EXEC_NAME: | |
44d3bd01 | 2286 | case LTTNG_DOMAIN_UST_PID: |
d78d6610 | 2287 | #endif |
44d3bd01 DG |
2288 | default: |
2289 | ret = LTTCOMM_UNKNOWN_DOMAIN; | |
2290 | goto error; | |
54d01ffb DG |
2291 | } |
2292 | ||
54d01ffb DG |
2293 | error: |
2294 | return ret; | |
2295 | } | |
2296 | ||
2297 | /* | |
2298 | * Command LTTNG_DISABLE_EVENT processed by the client thread. | |
2299 | */ | |
2300 | static int cmd_disable_event(struct ltt_session *session, int domain, | |
2301 | char *channel_name, char *event_name) | |
2302 | { | |
2303 | int ret; | |
54d01ffb DG |
2304 | |
2305 | switch (domain) { | |
2306 | case LTTNG_DOMAIN_KERNEL: | |
2bdd86d4 MD |
2307 | { |
2308 | struct ltt_kernel_channel *kchan; | |
b0a40d28 | 2309 | struct ltt_kernel_session *ksess; |
2bdd86d4 | 2310 | |
b0a40d28 DG |
2311 | ksess = session->kernel_session; |
2312 | ||
2313 | kchan = trace_kernel_get_channel_by_name(channel_name, ksess); | |
54d01ffb DG |
2314 | if (kchan == NULL) { |
2315 | ret = LTTCOMM_KERN_CHAN_NOT_FOUND; | |
2316 | goto error; | |
d65106b1 DG |
2317 | } |
2318 | ||
b0a40d28 | 2319 | ret = event_kernel_disable_tracepoint(ksess, kchan, event_name); |
54d01ffb DG |
2320 | if (ret != LTTCOMM_OK) { |
2321 | goto error; | |
2322 | } | |
2323 | ||
2324 | kernel_wait_quiescent(kernel_tracer_fd); | |
d65106b1 | 2325 | break; |
2bdd86d4 MD |
2326 | } |
2327 | case LTTNG_DOMAIN_UST: | |
b0a40d28 | 2328 | { |
b0a40d28 | 2329 | struct ltt_ust_channel *uchan; |
7f79d3a1 | 2330 | struct ltt_ust_session *usess; |
b0a40d28 DG |
2331 | |
2332 | usess = session->ust_session; | |
2333 | ||
2334 | uchan = trace_ust_find_channel_by_name(usess->domain_global.channels, | |
2335 | channel_name); | |
2336 | if (uchan == NULL) { | |
2337 | ret = LTTCOMM_UST_CHAN_NOT_FOUND; | |
2338 | goto error; | |
2339 | } | |
2340 | ||
7f79d3a1 DG |
2341 | ret = event_ust_disable_tracepoint(usess, domain, uchan, event_name); |
2342 | if (ret != LTTCOMM_OK) { | |
b0a40d28 DG |
2343 | goto error; |
2344 | } | |
2345 | ||
7f79d3a1 | 2346 | DBG3("Disable UST event %s in channel %s completed", event_name, |
b0a40d28 | 2347 | channel_name); |
b0a40d28 DG |
2348 | break; |
2349 | } | |
d78d6610 | 2350 | #if 0 |
2bdd86d4 MD |
2351 | case LTTNG_DOMAIN_UST_EXEC_NAME: |
2352 | case LTTNG_DOMAIN_UST_PID: | |
2353 | case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN: | |
d78d6610 | 2354 | #endif |
54d01ffb | 2355 | default: |
1ab1ea0b | 2356 | ret = LTTCOMM_UND; |
54d01ffb | 2357 | goto error; |
d65106b1 | 2358 | } |
26cc6b4e | 2359 | |
54d01ffb DG |
2360 | ret = LTTCOMM_OK; |
2361 | ||
2362 | error: | |
2363 | return ret; | |
2364 | } | |
2365 | ||
2366 | /* | |
2367 | * Command LTTNG_DISABLE_ALL_EVENT processed by the client thread. | |
2368 | */ | |
2369 | static int cmd_disable_event_all(struct ltt_session *session, int domain, | |
2370 | char *channel_name) | |
2371 | { | |
2372 | int ret; | |
54d01ffb DG |
2373 | |
2374 | switch (domain) { | |
2375 | case LTTNG_DOMAIN_KERNEL: | |
9730260e DG |
2376 | { |
2377 | struct ltt_kernel_session *ksess; | |
2378 | struct ltt_kernel_channel *kchan; | |
2379 | ||
2380 | ksess = session->kernel_session; | |
2381 | ||
2382 | kchan = trace_kernel_get_channel_by_name(channel_name, ksess); | |
54d01ffb DG |
2383 | if (kchan == NULL) { |
2384 | ret = LTTCOMM_KERN_CHAN_NOT_FOUND; | |
2385 | goto error; | |
26cc6b4e DG |
2386 | } |
2387 | ||
9730260e | 2388 | ret = event_kernel_disable_all(ksess, kchan); |
54d01ffb | 2389 | if (ret != LTTCOMM_OK) { |
0b97ec54 | 2390 | goto error; |
26cc6b4e DG |
2391 | } |
2392 | ||
54d01ffb | 2393 | kernel_wait_quiescent(kernel_tracer_fd); |
26cc6b4e | 2394 | break; |
9730260e DG |
2395 | } |
2396 | case LTTNG_DOMAIN_UST: | |
2397 | { | |
2398 | struct ltt_ust_session *usess; | |
2399 | struct ltt_ust_channel *uchan; | |
2400 | ||
2401 | usess = session->ust_session; | |
2402 | ||
2403 | uchan = trace_ust_find_channel_by_name(usess->domain_global.channels, | |
2404 | channel_name); | |
2405 | if (uchan == NULL) { | |
2406 | ret = LTTCOMM_UST_CHAN_NOT_FOUND; | |
2407 | goto error; | |
2408 | } | |
2409 | ||
7f79d3a1 DG |
2410 | ret = event_ust_disable_all_tracepoints(usess, domain, uchan); |
2411 | if (ret != 0) { | |
9730260e DG |
2412 | goto error; |
2413 | } | |
2414 | ||
7f79d3a1 | 2415 | DBG3("Disable all UST events in channel %s completed", channel_name); |
9730260e DG |
2416 | |
2417 | break; | |
2418 | } | |
d78d6610 | 2419 | #if 0 |
9730260e DG |
2420 | case LTTNG_DOMAIN_UST_EXEC_NAME: |
2421 | case LTTNG_DOMAIN_UST_PID: | |
2422 | case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN: | |
d78d6610 | 2423 | #endif |
54d01ffb | 2424 | default: |
1ab1ea0b | 2425 | ret = LTTCOMM_UND; |
54d01ffb | 2426 | goto error; |
26cc6b4e | 2427 | } |
e953ef25 | 2428 | |
54d01ffb | 2429 | ret = LTTCOMM_OK; |
e953ef25 | 2430 | |
54d01ffb DG |
2431 | error: |
2432 | return ret; | |
2433 | } | |
f5177a38 | 2434 | |
54d01ffb DG |
2435 | /* |
2436 | * Command LTTNG_ADD_CONTEXT processed by the client thread. | |
2437 | */ | |
2438 | static int cmd_add_context(struct ltt_session *session, int domain, | |
2439 | char *channel_name, char *event_name, struct lttng_event_context *ctx) | |
2440 | { | |
2441 | int ret; | |
f5177a38 | 2442 | |
54d01ffb DG |
2443 | switch (domain) { |
2444 | case LTTNG_DOMAIN_KERNEL: | |
2445 | /* Add kernel context to kernel tracer */ | |
2446 | ret = context_kernel_add(session->kernel_session, ctx, | |
2447 | event_name, channel_name); | |
2448 | if (ret != LTTCOMM_OK) { | |
f5177a38 | 2449 | goto error; |
e953ef25 | 2450 | } |
2bdd86d4 MD |
2451 | break; |
2452 | case LTTNG_DOMAIN_UST: | |
2453 | { | |
55cc08a6 | 2454 | struct ltt_ust_session *usess = session->ust_session; |
e953ef25 | 2455 | |
55cc08a6 DG |
2456 | ret = context_ust_add(usess, domain, ctx, event_name, channel_name); |
2457 | if (ret != LTTCOMM_OK) { | |
2458 | goto error; | |
2bdd86d4 | 2459 | } |
e953ef25 | 2460 | break; |
2bdd86d4 | 2461 | } |
d78d6610 | 2462 | #if 0 |
55cc08a6 DG |
2463 | case LTTNG_DOMAIN_UST_EXEC_NAME: |
2464 | case LTTNG_DOMAIN_UST_PID: | |
2465 | case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN: | |
d78d6610 | 2466 | #endif |
54d01ffb | 2467 | default: |
1ab1ea0b | 2468 | ret = LTTCOMM_UND; |
54d01ffb | 2469 | goto error; |
e953ef25 | 2470 | } |
950131af | 2471 | |
54d01ffb | 2472 | ret = LTTCOMM_OK; |
950131af | 2473 | |
54d01ffb DG |
2474 | error: |
2475 | return ret; | |
2476 | } | |
2477 | ||
2478 | /* | |
2479 | * Command LTTNG_ENABLE_EVENT processed by the client thread. | |
2480 | */ | |
2481 | static int cmd_enable_event(struct ltt_session *session, int domain, | |
2482 | char *channel_name, struct lttng_event *event) | |
2483 | { | |
2484 | int ret; | |
f6cd6b0f | 2485 | struct lttng_channel *attr; |
48842b30 | 2486 | struct ltt_ust_session *usess = session->ust_session; |
54d01ffb DG |
2487 | |
2488 | switch (domain) { | |
2489 | case LTTNG_DOMAIN_KERNEL: | |
2bdd86d4 MD |
2490 | { |
2491 | struct ltt_kernel_channel *kchan; | |
2492 | ||
54d01ffb DG |
2493 | kchan = trace_kernel_get_channel_by_name(channel_name, |
2494 | session->kernel_session); | |
2495 | if (kchan == NULL) { | |
f6cd6b0f DG |
2496 | attr = channel_new_default_attr(domain); |
2497 | if (attr == NULL) { | |
2498 | ret = LTTCOMM_FATAL; | |
2499 | goto error; | |
2500 | } | |
2501 | snprintf(attr->name, NAME_MAX, "%s", channel_name); | |
2502 | ||
54d01ffb | 2503 | /* This call will notify the kernel thread */ |
44d3bd01 | 2504 | ret = channel_kernel_create(session->kernel_session, |
f6cd6b0f | 2505 | attr, kernel_poll_pipe[1]); |
54d01ffb | 2506 | if (ret != LTTCOMM_OK) { |
ff4d74e6 | 2507 | free(attr); |
f5177a38 DG |
2508 | goto error; |
2509 | } | |
ff4d74e6 | 2510 | free(attr); |
54d01ffb | 2511 | } |
950131af | 2512 | |
54d01ffb DG |
2513 | /* Get the newly created kernel channel pointer */ |
2514 | kchan = trace_kernel_get_channel_by_name(channel_name, | |
2515 | session->kernel_session); | |
2516 | if (kchan == NULL) { | |
2517 | /* This sould not happen... */ | |
2518 | ret = LTTCOMM_FATAL; | |
2519 | goto error; | |
2520 | } | |
f5177a38 | 2521 | |
48842b30 DG |
2522 | ret = event_kernel_enable_tracepoint(session->kernel_session, kchan, |
2523 | event); | |
54d01ffb | 2524 | if (ret != LTTCOMM_OK) { |
f5177a38 | 2525 | goto error; |
950131af DG |
2526 | } |
2527 | ||
54d01ffb | 2528 | kernel_wait_quiescent(kernel_tracer_fd); |
950131af | 2529 | break; |
2bdd86d4 MD |
2530 | } |
2531 | case LTTNG_DOMAIN_UST: | |
2532 | { | |
aea829b3 | 2533 | struct lttng_channel *attr; |
edb67388 | 2534 | struct ltt_ust_channel *uchan; |
2bdd86d4 | 2535 | |
edb67388 | 2536 | /* Get channel from global UST domain */ |
48842b30 DG |
2537 | uchan = trace_ust_find_channel_by_name(usess->domain_global.channels, |
2538 | channel_name); | |
2539 | if (uchan == NULL) { | |
aea829b3 DG |
2540 | /* Create default channel */ |
2541 | attr = channel_new_default_attr(domain); | |
2542 | if (attr == NULL) { | |
2543 | ret = LTTCOMM_FATAL; | |
2544 | goto error; | |
2545 | } | |
596219f7 | 2546 | snprintf(attr->name, NAME_MAX, "%s", channel_name); |
edb67388 | 2547 | attr->name[NAME_MAX - 1] = '\0'; |
aea829b3 | 2548 | |
7885e399 | 2549 | ret = channel_ust_create(usess, domain, attr); |
edb67388 | 2550 | if (ret != LTTCOMM_OK) { |
ff4d74e6 | 2551 | free(attr); |
aea829b3 DG |
2552 | goto error; |
2553 | } | |
aea829b3 DG |
2554 | free(attr); |
2555 | ||
2556 | /* Get the newly created channel reference back */ | |
2557 | uchan = trace_ust_find_channel_by_name( | |
2558 | usess->domain_global.channels, channel_name); | |
2559 | if (uchan == NULL) { | |
2560 | /* Something is really wrong */ | |
2561 | ret = LTTCOMM_FATAL; | |
2562 | goto error; | |
2563 | } | |
48842b30 | 2564 | } |
2bdd86d4 | 2565 | |
edb67388 | 2566 | /* At this point, the session and channel exist on the tracer */ |
edb67388 DG |
2567 | ret = event_ust_enable_tracepoint(usess, domain, uchan, event); |
2568 | if (ret != LTTCOMM_OK) { | |
48842b30 | 2569 | goto error; |
2bdd86d4 MD |
2570 | } |
2571 | break; | |
2572 | } | |
d78d6610 | 2573 | #if 0 |
2bdd86d4 MD |
2574 | case LTTNG_DOMAIN_UST_EXEC_NAME: |
2575 | case LTTNG_DOMAIN_UST_PID: | |
2576 | case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN: | |
d78d6610 | 2577 | #endif |
54d01ffb | 2578 | default: |
1ab1ea0b | 2579 | ret = LTTCOMM_UND; |
54d01ffb | 2580 | goto error; |
950131af | 2581 | } |
d36b8583 | 2582 | |
54d01ffb | 2583 | ret = LTTCOMM_OK; |
d36b8583 | 2584 | |
54d01ffb DG |
2585 | error: |
2586 | return ret; | |
2587 | } | |
7d29a247 | 2588 | |
54d01ffb DG |
2589 | /* |
2590 | * Command LTTNG_ENABLE_ALL_EVENT processed by the client thread. | |
2591 | */ | |
2592 | static int cmd_enable_event_all(struct ltt_session *session, int domain, | |
8c9ae521 | 2593 | char *channel_name, int event_type) |
54d01ffb DG |
2594 | { |
2595 | int ret; | |
2596 | struct ltt_kernel_channel *kchan; | |
7d29a247 | 2597 | |
54d01ffb DG |
2598 | switch (domain) { |
2599 | case LTTNG_DOMAIN_KERNEL: | |
2600 | kchan = trace_kernel_get_channel_by_name(channel_name, | |
2601 | session->kernel_session); | |
2602 | if (kchan == NULL) { | |
2603 | /* This call will notify the kernel thread */ | |
44d3bd01 DG |
2604 | ret = channel_kernel_create(session->kernel_session, NULL, |
2605 | kernel_poll_pipe[1]); | |
54d01ffb DG |
2606 | if (ret != LTTCOMM_OK) { |
2607 | goto error; | |
d36b8583 | 2608 | } |
0d0c377a | 2609 | |
8f69e5eb DG |
2610 | /* Get the newly created kernel channel pointer */ |
2611 | kchan = trace_kernel_get_channel_by_name(channel_name, | |
2612 | session->kernel_session); | |
2613 | if (kchan == NULL) { | |
2614 | /* This sould not happen... */ | |
2615 | ret = LTTCOMM_FATAL; | |
2616 | goto error; | |
2617 | } | |
2618 | ||
54d01ffb | 2619 | } |
0fdd1e2c | 2620 | |
7a3d1328 | 2621 | switch (event_type) { |
76d45b40 | 2622 | case LTTNG_EVENT_SYSCALL: |
7a3d1328 | 2623 | ret = event_kernel_enable_all_syscalls(session->kernel_session, |
8c9ae521 | 2624 | kchan, kernel_tracer_fd); |
7a3d1328 | 2625 | break; |
76d45b40 | 2626 | case LTTNG_EVENT_TRACEPOINT: |
8c9ae521 | 2627 | /* |
7a3d1328 MD |
2628 | * This call enables all LTTNG_KERNEL_TRACEPOINTS and |
2629 | * events already registered to the channel. | |
8c9ae521 | 2630 | */ |
7a3d1328 MD |
2631 | ret = event_kernel_enable_all_tracepoints(session->kernel_session, |
2632 | kchan, kernel_tracer_fd); | |
2633 | break; | |
76d45b40 | 2634 | case LTTNG_EVENT_ALL: |
7a3d1328 | 2635 | /* Enable syscalls and tracepoints */ |
8c9ae521 DG |
2636 | ret = event_kernel_enable_all(session->kernel_session, |
2637 | kchan, kernel_tracer_fd); | |
7a3d1328 MD |
2638 | break; |
2639 | default: | |
2640 | ret = LTTCOMM_KERN_ENABLE_FAIL; | |
2641 | goto error; | |
8c9ae521 | 2642 | } |
8f69e5eb DG |
2643 | |
2644 | /* Manage return value */ | |
54d01ffb | 2645 | if (ret != LTTCOMM_OK) { |
0d0c377a | 2646 | goto error; |
d36b8583 DG |
2647 | } |
2648 | ||
54d01ffb | 2649 | kernel_wait_quiescent(kernel_tracer_fd); |
d36b8583 | 2650 | break; |
76d45b40 DG |
2651 | case LTTNG_DOMAIN_UST: |
2652 | { | |
2653 | struct lttng_channel *attr; | |
2654 | struct ltt_ust_channel *uchan; | |
2655 | struct ltt_ust_session *usess = session->ust_session; | |
2656 | ||
2657 | /* Get channel from global UST domain */ | |
2658 | uchan = trace_ust_find_channel_by_name(usess->domain_global.channels, | |
2659 | channel_name); | |
2660 | if (uchan == NULL) { | |
2661 | /* Create default channel */ | |
2662 | attr = channel_new_default_attr(domain); | |
2663 | if (attr == NULL) { | |
2664 | ret = LTTCOMM_FATAL; | |
2665 | goto error; | |
2666 | } | |
2667 | snprintf(attr->name, NAME_MAX, "%s", channel_name); | |
2668 | attr->name[NAME_MAX - 1] = '\0'; | |
2669 | ||
2670 | /* Use the internal command enable channel */ | |
7885e399 | 2671 | ret = channel_ust_create(usess, domain, attr); |
76d45b40 DG |
2672 | if (ret != LTTCOMM_OK) { |
2673 | free(attr); | |
2674 | goto error; | |
2675 | } | |
2676 | free(attr); | |
2677 | ||
2678 | /* Get the newly created channel reference back */ | |
2679 | uchan = trace_ust_find_channel_by_name( | |
2680 | usess->domain_global.channels, channel_name); | |
2681 | if (uchan == NULL) { | |
2682 | /* Something is really wrong */ | |
2683 | ret = LTTCOMM_FATAL; | |
2684 | goto error; | |
2685 | } | |
2686 | } | |
2687 | ||
2688 | /* At this point, the session and channel exist on the tracer */ | |
2689 | ||
2690 | switch (event_type) { | |
2691 | case LTTNG_EVENT_ALL: | |
2692 | case LTTNG_EVENT_TRACEPOINT: | |
2693 | ret = event_ust_enable_all_tracepoints(usess, domain, uchan); | |
2694 | if (ret != LTTCOMM_OK) { | |
2695 | goto error; | |
2696 | } | |
2697 | break; | |
2698 | default: | |
2699 | ret = LTTCOMM_UST_ENABLE_FAIL; | |
2700 | goto error; | |
2701 | } | |
2702 | ||
2703 | /* Manage return value */ | |
2704 | if (ret != LTTCOMM_OK) { | |
2705 | goto error; | |
2706 | } | |
2707 | ||
2708 | break; | |
2709 | } | |
d78d6610 | 2710 | #if 0 |
76d45b40 DG |
2711 | case LTTNG_DOMAIN_UST_EXEC_NAME: |
2712 | case LTTNG_DOMAIN_UST_PID: | |
2713 | case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN: | |
d78d6610 | 2714 | #endif |
54d01ffb | 2715 | default: |
1ab1ea0b | 2716 | ret = LTTCOMM_UND; |
54d01ffb | 2717 | goto error; |
d36b8583 | 2718 | } |
f3ed775e | 2719 | |
54d01ffb DG |
2720 | ret = LTTCOMM_OK; |
2721 | ||
2722 | error: | |
2723 | return ret; | |
2724 | } | |
2725 | ||
2726 | /* | |
2727 | * Command LTTNG_LIST_TRACEPOINTS processed by the client thread. | |
2728 | */ | |
2729 | static ssize_t cmd_list_tracepoints(int domain, struct lttng_event **events) | |
2730 | { | |
2731 | int ret; | |
2732 | ssize_t nb_events = 0; | |
2733 | ||
2734 | switch (domain) { | |
2735 | case LTTNG_DOMAIN_KERNEL: | |
2736 | nb_events = kernel_list_events(kernel_tracer_fd, events); | |
2737 | if (nb_events < 0) { | |
2738 | ret = LTTCOMM_KERN_LIST_FAIL; | |
2739 | goto error; | |
894be886 | 2740 | } |
54d01ffb | 2741 | break; |
b551a063 DG |
2742 | case LTTNG_DOMAIN_UST: |
2743 | nb_events = ust_app_list_events(events); | |
2744 | if (nb_events < 0) { | |
2745 | ret = LTTCOMM_UST_LIST_FAIL; | |
2746 | goto error; | |
2747 | } | |
2748 | break; | |
54d01ffb | 2749 | default: |
1ab1ea0b | 2750 | ret = LTTCOMM_UND; |
54d01ffb DG |
2751 | goto error; |
2752 | } | |
894be886 | 2753 | |
54d01ffb | 2754 | return nb_events; |
7d29a247 | 2755 | |
54d01ffb DG |
2756 | error: |
2757 | /* Return negative value to differentiate return code */ | |
2758 | return -ret; | |
2759 | } | |
b389abbe | 2760 | |
54d01ffb DG |
2761 | /* |
2762 | * Command LTTNG_START_TRACE processed by the client thread. | |
2763 | */ | |
2764 | static int cmd_start_trace(struct ltt_session *session) | |
2765 | { | |
2766 | int ret; | |
54d01ffb | 2767 | struct ltt_kernel_session *ksession; |
b9d9b220 | 2768 | struct ltt_ust_session *usess; |
b389abbe | 2769 | |
54d01ffb DG |
2770 | /* Short cut */ |
2771 | ksession = session->kernel_session; | |
b9d9b220 | 2772 | usess = session->ust_session; |
5eb91c98 | 2773 | |
b9ef1c83 DG |
2774 | if (session->enabled) { |
2775 | ret = LTTCOMM_UST_START_FAIL; | |
2776 | goto error; | |
2777 | } | |
2778 | ||
464dd62d MD |
2779 | session->enabled = 1; |
2780 | ||
54d01ffb DG |
2781 | /* Kernel tracing */ |
2782 | if (ksession != NULL) { | |
2bdd86d4 MD |
2783 | struct ltt_kernel_channel *kchan; |
2784 | ||
54d01ffb DG |
2785 | /* Open kernel metadata */ |
2786 | if (ksession->metadata == NULL) { | |
2787 | ret = kernel_open_metadata(ksession, ksession->trace_path); | |
2788 | if (ret < 0) { | |
2789 | ret = LTTCOMM_KERN_META_FAIL; | |
2790 | goto error; | |
b389abbe | 2791 | } |
54d01ffb | 2792 | } |
7d29a247 | 2793 | |
54d01ffb DG |
2794 | /* Open kernel metadata stream */ |
2795 | if (ksession->metadata_stream_fd == 0) { | |
2796 | ret = kernel_open_metadata_stream(ksession); | |
2797 | if (ret < 0) { | |
2798 | ERR("Kernel create metadata stream failed"); | |
2799 | ret = LTTCOMM_KERN_STREAM_FAIL; | |
2800 | goto error; | |
2801 | } | |
2802 | } | |
2803 | ||
2804 | /* For each channel */ | |
2805 | cds_list_for_each_entry(kchan, &ksession->channel_list.head, list) { | |
2806 | if (kchan->stream_count == 0) { | |
2807 | ret = kernel_open_channel_stream(kchan); | |
2808 | if (ret < 0) { | |
2809 | ret = LTTCOMM_KERN_STREAM_FAIL; | |
7d29a247 DG |
2810 | goto error; |
2811 | } | |
54d01ffb DG |
2812 | /* Update the stream global counter */ |
2813 | ksession->stream_count_global += ret; | |
7d29a247 | 2814 | } |
54d01ffb DG |
2815 | } |
2816 | ||
2817 | /* Setup kernel consumer socket and send fds to it */ | |
2818 | ret = init_kernel_tracing(ksession); | |
2819 | if (ret < 0) { | |
2820 | ret = LTTCOMM_KERN_START_FAIL; | |
2821 | goto error; | |
2822 | } | |
2823 | ||
2824 | /* This start the kernel tracing */ | |
2825 | ret = kernel_start_session(ksession); | |
2826 | if (ret < 0) { | |
2827 | ret = LTTCOMM_KERN_START_FAIL; | |
2828 | goto error; | |
2829 | } | |
2830 | ||
2831 | /* Quiescent wait after starting trace */ | |
2832 | kernel_wait_quiescent(kernel_tracer_fd); | |
2833 | } | |
2834 | ||
36dc12cc | 2835 | /* Flag session that trace should start automatically */ |
b9d9b220 DG |
2836 | if (usess) { |
2837 | usess->start_trace = 1; | |
36dc12cc | 2838 | |
b9d9b220 DG |
2839 | ret = ust_app_start_trace_all(usess); |
2840 | if (ret < 0) { | |
2841 | ret = LTTCOMM_UST_START_FAIL; | |
2842 | goto error; | |
2843 | } | |
2bdd86d4 | 2844 | } |
54d01ffb DG |
2845 | |
2846 | ret = LTTCOMM_OK; | |
2847 | ||
2848 | error: | |
2849 | return ret; | |
2850 | } | |
2851 | ||
2852 | /* | |
2853 | * Command LTTNG_STOP_TRACE processed by the client thread. | |
2854 | */ | |
2855 | static int cmd_stop_trace(struct ltt_session *session) | |
2856 | { | |
2857 | int ret; | |
2858 | struct ltt_kernel_channel *kchan; | |
2859 | struct ltt_kernel_session *ksession; | |
8be98f9a | 2860 | struct ltt_ust_session *usess; |
54d01ffb DG |
2861 | |
2862 | /* Short cut */ | |
2863 | ksession = session->kernel_session; | |
8be98f9a | 2864 | usess = session->ust_session; |
54d01ffb | 2865 | |
b9ef1c83 | 2866 | if (!session->enabled) { |
190df5ac | 2867 | ret = LTTCOMM_UST_STOP_FAIL; |
b9ef1c83 DG |
2868 | goto error; |
2869 | } | |
2870 | ||
464dd62d MD |
2871 | session->enabled = 0; |
2872 | ||
54d01ffb DG |
2873 | /* Kernel tracer */ |
2874 | if (ksession != NULL) { | |
2875 | DBG("Stop kernel tracing"); | |
2876 | ||
2877 | /* Flush all buffers before stopping */ | |
2878 | ret = kernel_metadata_flush_buffer(ksession->metadata_stream_fd); | |
2879 | if (ret < 0) { | |
2880 | ERR("Kernel metadata flush failed"); | |
2881 | } | |
f34daff7 | 2882 | |
54d01ffb DG |
2883 | cds_list_for_each_entry(kchan, &ksession->channel_list.head, list) { |
2884 | ret = kernel_flush_buffer(kchan); | |
0d0c377a | 2885 | if (ret < 0) { |
54d01ffb | 2886 | ERR("Kernel flush buffer error"); |
7d29a247 | 2887 | } |
54d01ffb | 2888 | } |
19e70852 | 2889 | |
54d01ffb DG |
2890 | ret = kernel_stop_session(ksession); |
2891 | if (ret < 0) { | |
2892 | ret = LTTCOMM_KERN_STOP_FAIL; | |
19e70852 | 2893 | goto error; |
f3ed775e | 2894 | } |
54d01ffb DG |
2895 | |
2896 | kernel_wait_quiescent(kernel_tracer_fd); | |
894be886 | 2897 | } |
54d01ffb | 2898 | |
8be98f9a MD |
2899 | if (usess) { |
2900 | usess->start_trace = 0; | |
2bdd86d4 | 2901 | |
8be98f9a | 2902 | ret = ust_app_stop_trace_all(usess); |
2bdd86d4 | 2903 | if (ret < 0) { |
190df5ac | 2904 | ret = LTTCOMM_UST_STOP_FAIL; |
2bdd86d4 MD |
2905 | goto error; |
2906 | } | |
2bdd86d4 | 2907 | } |
54d01ffb DG |
2908 | |
2909 | ret = LTTCOMM_OK; | |
2910 | ||
2911 | error: | |
2912 | return ret; | |
2913 | } | |
2914 | ||
2915 | /* | |
2916 | * Command LTTNG_CREATE_SESSION processed by the client thread. | |
2917 | */ | |
ca4537d3 | 2918 | static int cmd_create_session(char *name, char *path, struct ucred *creds) |
54d01ffb DG |
2919 | { |
2920 | int ret; | |
2921 | ||
ca4537d3 | 2922 | ret = session_create(name, path, creds->uid, creds->gid); |
54d01ffb DG |
2923 | if (ret != LTTCOMM_OK) { |
2924 | goto error; | |
2925 | } | |
2926 | ||
2927 | ret = LTTCOMM_OK; | |
2928 | ||
2929 | error: | |
2930 | return ret; | |
2931 | } | |
2932 | ||
2933 | /* | |
2934 | * Command LTTNG_DESTROY_SESSION processed by the client thread. | |
2935 | */ | |
2936 | static int cmd_destroy_session(struct ltt_session *session, char *name) | |
2937 | { | |
2938 | int ret; | |
2939 | ||
2940 | /* Clean kernel session teardown */ | |
2941 | teardown_kernel_session(session); | |
84cd17c6 MD |
2942 | /* UST session teardown */ |
2943 | teardown_ust_session(session); | |
54d01ffb DG |
2944 | |
2945 | /* | |
2946 | * Must notify the kernel thread here to update it's poll setin order | |
2947 | * to remove the channel(s)' fd just destroyed. | |
2948 | */ | |
2949 | ret = notify_thread_pipe(kernel_poll_pipe[1]); | |
2950 | if (ret < 0) { | |
2951 | perror("write kernel poll pipe"); | |
2952 | } | |
2953 | ||
271933a4 | 2954 | ret = session_destroy(session); |
54d01ffb DG |
2955 | |
2956 | return ret; | |
2957 | } | |
2958 | ||
2959 | /* | |
2960 | * Command LTTNG_CALIBRATE processed by the client thread. | |
2961 | */ | |
2962 | static int cmd_calibrate(int domain, struct lttng_calibrate *calibrate) | |
2963 | { | |
2964 | int ret; | |
2965 | ||
2966 | switch (domain) { | |
2967 | case LTTNG_DOMAIN_KERNEL: | |
33a2b854 | 2968 | { |
54d01ffb | 2969 | struct lttng_kernel_calibrate kcalibrate; |
33a2b854 | 2970 | |
54d01ffb DG |
2971 | kcalibrate.type = calibrate->type; |
2972 | ret = kernel_calibrate(kernel_tracer_fd, &kcalibrate); | |
33a2b854 | 2973 | if (ret < 0) { |
54d01ffb DG |
2974 | ret = LTTCOMM_KERN_ENABLE_FAIL; |
2975 | goto error; | |
33a2b854 | 2976 | } |
54d01ffb DG |
2977 | break; |
2978 | } | |
4466912f DG |
2979 | case LTTNG_DOMAIN_UST: |
2980 | { | |
2981 | struct lttng_ust_calibrate ucalibrate; | |
2982 | ||
2983 | ucalibrate.type = calibrate->type; | |
2984 | ret = ust_app_calibrate_glb(&ucalibrate); | |
2985 | if (ret < 0) { | |
2986 | ret = LTTCOMM_UST_CALIBRATE_FAIL; | |
2987 | goto error; | |
2988 | } | |
2989 | break; | |
2990 | } | |
54d01ffb | 2991 | default: |
1ab1ea0b | 2992 | ret = LTTCOMM_UND; |
54d01ffb DG |
2993 | goto error; |
2994 | } | |
33a2b854 | 2995 | |
54d01ffb | 2996 | ret = LTTCOMM_OK; |
33a2b854 | 2997 | |
54d01ffb DG |
2998 | error: |
2999 | return ret; | |
3000 | } | |
7d29a247 | 3001 | |
54d01ffb DG |
3002 | /* |
3003 | * Command LTTNG_REGISTER_CONSUMER processed by the client thread. | |
3004 | */ | |
3005 | static int cmd_register_consumer(struct ltt_session *session, int domain, | |
3006 | char *sock_path) | |
3007 | { | |
3008 | int ret, sock; | |
b389abbe | 3009 | |
54d01ffb DG |
3010 | switch (domain) { |
3011 | case LTTNG_DOMAIN_KERNEL: | |
3012 | /* Can't register a consumer if there is already one */ | |
48c4f28c | 3013 | if (session->kernel_session->consumer_fds_sent != 0) { |
54d01ffb DG |
3014 | ret = LTTCOMM_KERN_CONSUMER_FAIL; |
3015 | goto error; | |
3016 | } | |
3017 | ||
3018 | sock = lttcomm_connect_unix_sock(sock_path); | |
3019 | if (sock < 0) { | |
3020 | ret = LTTCOMM_CONNECT_FAIL; | |
3021 | goto error; | |
3022 | } | |
3023 | ||
3024 | session->kernel_session->consumer_fd = sock; | |
3025 | break; | |
3026 | default: | |
3027 | /* TODO: Userspace tracing */ | |
1ab1ea0b | 3028 | ret = LTTCOMM_UND; |
54d01ffb DG |
3029 | goto error; |
3030 | } | |
3031 | ||
3032 | ret = LTTCOMM_OK; | |
3033 | ||
3034 | error: | |
3035 | return ret; | |
3036 | } | |
3037 | ||
3038 | /* | |
3039 | * Command LTTNG_LIST_DOMAINS processed by the client thread. | |
3040 | */ | |
3041 | static ssize_t cmd_list_domains(struct ltt_session *session, | |
3042 | struct lttng_domain **domains) | |
3043 | { | |
b551a063 | 3044 | int ret, index = 0; |
54d01ffb DG |
3045 | ssize_t nb_dom = 0; |
3046 | ||
3047 | if (session->kernel_session != NULL) { | |
b551a063 | 3048 | DBG3("Listing domains found kernel domain"); |
54d01ffb DG |
3049 | nb_dom++; |
3050 | } | |
3051 | ||
b551a063 DG |
3052 | if (session->ust_session != NULL) { |
3053 | DBG3("Listing domains found UST global domain"); | |
3054 | nb_dom++; | |
3055 | } | |
54d01ffb | 3056 | |
b551a063 | 3057 | *domains = zmalloc(nb_dom * sizeof(struct lttng_domain)); |
54d01ffb DG |
3058 | if (*domains == NULL) { |
3059 | ret = -LTTCOMM_FATAL; | |
3060 | goto error; | |
3061 | } | |
3062 | ||
b551a063 DG |
3063 | if (session->kernel_session != NULL) { |
3064 | (*domains)[index].type = LTTNG_DOMAIN_KERNEL; | |
3065 | index++; | |
3066 | } | |
3067 | ||
3068 | if (session->ust_session != NULL) { | |
3069 | (*domains)[index].type = LTTNG_DOMAIN_UST; | |
3070 | index++; | |
3071 | } | |
54d01ffb | 3072 | |
54d01ffb DG |
3073 | return nb_dom; |
3074 | ||
3075 | error: | |
3076 | return ret; | |
3077 | } | |
3078 | ||
3079 | /* | |
3080 | * Command LTTNG_LIST_CHANNELS processed by the client thread. | |
3081 | */ | |
b551a063 | 3082 | static ssize_t cmd_list_channels(int domain, struct ltt_session *session, |
54d01ffb DG |
3083 | struct lttng_channel **channels) |
3084 | { | |
3085 | int ret; | |
3086 | ssize_t nb_chan = 0; | |
3087 | ||
b551a063 DG |
3088 | switch (domain) { |
3089 | case LTTNG_DOMAIN_KERNEL: | |
3090 | if (session->kernel_session != NULL) { | |
3091 | nb_chan = session->kernel_session->channel_count; | |
3092 | } | |
0df502fd | 3093 | DBG3("Number of kernel channels %zd", nb_chan); |
b551a063 DG |
3094 | break; |
3095 | case LTTNG_DOMAIN_UST: | |
3096 | if (session->ust_session != NULL) { | |
bec39940 | 3097 | nb_chan = lttng_ht_get_count( |
b551a063 DG |
3098 | session->ust_session->domain_global.channels); |
3099 | } | |
0df502fd | 3100 | DBG3("Number of UST global channels %zd", nb_chan); |
b551a063 DG |
3101 | break; |
3102 | default: | |
3103 | *channels = NULL; | |
1ab1ea0b | 3104 | ret = -LTTCOMM_UND; |
54d01ffb DG |
3105 | goto error; |
3106 | } | |
3107 | ||
b551a063 DG |
3108 | if (nb_chan > 0) { |
3109 | *channels = zmalloc(nb_chan * sizeof(struct lttng_channel)); | |
3110 | if (*channels == NULL) { | |
3111 | ret = -LTTCOMM_FATAL; | |
3112 | goto error; | |
3113 | } | |
54d01ffb | 3114 | |
b551a063 DG |
3115 | list_lttng_channels(domain, session, *channels); |
3116 | } else { | |
3117 | *channels = NULL; | |
3118 | } | |
2bdd86d4 | 3119 | |
54d01ffb DG |
3120 | return nb_chan; |
3121 | ||
3122 | error: | |
3123 | return ret; | |
3124 | } | |
3125 | ||
3126 | /* | |
3127 | * Command LTTNG_LIST_EVENTS processed by the client thread. | |
3128 | */ | |
b551a063 | 3129 | static ssize_t cmd_list_events(int domain, struct ltt_session *session, |
54d01ffb DG |
3130 | char *channel_name, struct lttng_event **events) |
3131 | { | |
b551a063 | 3132 | int ret = 0; |
54d01ffb | 3133 | ssize_t nb_event = 0; |
54d01ffb | 3134 | |
b551a063 DG |
3135 | switch (domain) { |
3136 | case LTTNG_DOMAIN_KERNEL: | |
3137 | if (session->kernel_session != NULL) { | |
3138 | nb_event = list_lttng_kernel_events(channel_name, | |
3139 | session->kernel_session, events); | |
54d01ffb | 3140 | } |
b551a063 DG |
3141 | break; |
3142 | case LTTNG_DOMAIN_UST: | |
3143 | { | |
3144 | if (session->ust_session != NULL) { | |
3145 | nb_event = list_lttng_ust_global_events(channel_name, | |
3146 | &session->ust_session->domain_global, events); | |
3147 | } | |
3148 | break; | |
54d01ffb | 3149 | } |
b551a063 | 3150 | default: |
1ab1ea0b | 3151 | ret = -LTTCOMM_UND; |
54d01ffb DG |
3152 | goto error; |
3153 | } | |
3154 | ||
b551a063 | 3155 | ret = nb_event; |
54d01ffb DG |
3156 | |
3157 | error: | |
3158 | return ret; | |
3159 | } | |
3160 | ||
3161 | /* | |
3162 | * Process the command requested by the lttng client within the command | |
3163 | * context structure. This function make sure that the return structure (llm) | |
3164 | * is set and ready for transmission before returning. | |
3165 | * | |
3166 | * Return any error encountered or 0 for success. | |
3167 | */ | |
3168 | static int process_client_msg(struct command_ctx *cmd_ctx) | |
3169 | { | |
3170 | int ret = LTTCOMM_OK; | |
44d3bd01 | 3171 | int need_tracing_session = 1; |
f84aa40a | 3172 | int need_domain; |
54d01ffb DG |
3173 | |
3174 | DBG("Processing client command %d", cmd_ctx->lsm->cmd_type); | |
3175 | ||
f84aa40a MD |
3176 | switch (cmd_ctx->lsm->cmd_type) { |
3177 | case LTTNG_CREATE_SESSION: | |
3178 | case LTTNG_DESTROY_SESSION: | |
3179 | case LTTNG_LIST_SESSIONS: | |
3180 | case LTTNG_LIST_DOMAINS: | |
3181 | case LTTNG_START_TRACE: | |
3182 | case LTTNG_STOP_TRACE: | |
3183 | need_domain = 0; | |
faf09bcf | 3184 | break; |
f84aa40a MD |
3185 | default: |
3186 | need_domain = 1; | |
3187 | } | |
3188 | ||
3189 | if (opt_no_kernel && need_domain | |
3190 | && cmd_ctx->lsm->domain.type == LTTNG_DOMAIN_KERNEL) { | |
4fba7219 DG |
3191 | ret = LTTCOMM_KERN_NA; |
3192 | goto error; | |
3193 | } | |
3194 | ||
54d01ffb DG |
3195 | /* |
3196 | * Check for command that don't needs to allocate a returned payload. We do | |
44d3bd01 | 3197 | * this here so we don't have to make the call for no payload at each |
54d01ffb DG |
3198 | * command. |
3199 | */ | |
3200 | switch(cmd_ctx->lsm->cmd_type) { | |
3201 | case LTTNG_LIST_SESSIONS: | |
3202 | case LTTNG_LIST_TRACEPOINTS: | |
3203 | case LTTNG_LIST_DOMAINS: | |
3204 | case LTTNG_LIST_CHANNELS: | |
3205 | case LTTNG_LIST_EVENTS: | |
3206 | break; | |
3207 | default: | |
3208 | /* Setup lttng message with no payload */ | |
3209 | ret = setup_lttng_msg(cmd_ctx, 0); | |
3210 | if (ret < 0) { | |
3211 | /* This label does not try to unlock the session */ | |
3212 | goto init_setup_error; | |
3213 | } | |
3214 | } | |
3215 | ||
3216 | /* Commands that DO NOT need a session. */ | |
3217 | switch (cmd_ctx->lsm->cmd_type) { | |
54d01ffb | 3218 | case LTTNG_CREATE_SESSION: |
f84aa40a | 3219 | case LTTNG_CALIBRATE: |
54d01ffb DG |
3220 | case LTTNG_LIST_SESSIONS: |
3221 | case LTTNG_LIST_TRACEPOINTS: | |
44d3bd01 | 3222 | need_tracing_session = 0; |
54d01ffb DG |
3223 | break; |
3224 | default: | |
3225 | DBG("Getting session %s by name", cmd_ctx->lsm->session.name); | |
74babd95 | 3226 | session_lock_list(); |
54d01ffb | 3227 | cmd_ctx->session = session_find_by_name(cmd_ctx->lsm->session.name); |
74babd95 | 3228 | session_unlock_list(); |
54d01ffb DG |
3229 | if (cmd_ctx->session == NULL) { |
3230 | if (cmd_ctx->lsm->session.name != NULL) { | |
3231 | ret = LTTCOMM_SESS_NOT_FOUND; | |
3232 | } else { | |
3233 | /* If no session name specified */ | |
3234 | ret = LTTCOMM_SELECT_SESS; | |