Commit | Line | Data |
---|---|---|
826d496d MD |
1 | /* |
2 | * Copyright (C) 2011 - David Goulet <david.goulet@polymtl.ca> | |
fac6795d DG |
3 | * |
4 | * This program is free software; you can redistribute it and/or | |
5 | * modify it under the terms of the GNU General Public License | |
6 | * as published by the Free Software Foundation; either version 2 | |
7 | * of the License, or (at your option) any later version. | |
91d76f53 | 8 | * |
fac6795d DG |
9 | * This program is distributed in the hope that it will be useful, |
10 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
12 | * GNU General Public License for more details. | |
91d76f53 | 13 | * |
fac6795d DG |
14 | * You should have received a copy of the GNU General Public License |
15 | * along with this program; if not, write to the Free Software | |
16 | * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. | |
fac6795d DG |
17 | */ |
18 | ||
19 | #define _GNU_SOURCE | |
20 | #include <fcntl.h> | |
21 | #include <getopt.h> | |
22 | #include <grp.h> | |
23 | #include <limits.h> | |
24 | #include <pthread.h> | |
25 | #include <signal.h> | |
26 | #include <stdio.h> | |
27 | #include <stdlib.h> | |
28 | #include <string.h> | |
29 | #include <sys/ipc.h> | |
30 | #include <sys/shm.h> | |
31 | #include <sys/socket.h> | |
32 | #include <sys/stat.h> | |
33 | #include <sys/types.h> | |
34 | #include <unistd.h> | |
35 | ||
36 | #include <urcu/list.h> /* URCU list library (-lurcu) */ | |
37 | #include <ust/ustctl.h> /* UST control lib (-lust) */ | |
5b97ec60 | 38 | #include <lttng/lttng.h> |
fac6795d DG |
39 | |
40 | #include "liblttsessiondcomm.h" | |
41 | #include "ltt-sessiond.h" | |
75462a81 | 42 | #include "lttngerr.h" |
20fe2104 | 43 | #include "kernel-ctl.h" |
5b74c7b1 | 44 | #include "session.h" |
fda89c9b | 45 | #include "trace.h" |
91d76f53 | 46 | #include "traceable-app.h" |
fac6795d | 47 | |
5e16da05 MD |
48 | /* |
49 | * TODO: | |
50 | * teardown: signal SIGTERM handler -> write into pipe. Threads waits | |
51 | * with epoll on pipe and on other pipes/sockets for commands. Main | |
52 | * simply waits on pthread join. | |
53 | */ | |
54 | ||
75462a81 | 55 | /* Const values */ |
686204ab MD |
56 | const char default_home_dir[] = DEFAULT_HOME_DIR; |
57 | const char default_tracing_group[] = DEFAULT_TRACING_GROUP; | |
58 | const char default_ust_sock_dir[] = DEFAULT_UST_SOCK_DIR; | |
59 | const char default_global_apps_pipe[] = DEFAULT_GLOBAL_APPS_PIPE; | |
60 | ||
fac6795d | 61 | /* Static functions */ |
fac6795d | 62 | static int check_existing_daemon(void); |
471d1693 | 63 | static int ust_connect_app(pid_t pid); |
fac6795d | 64 | static int init_daemon_socket(void); |
62bd06d8 | 65 | static int notify_apps(const char* name); |
5461b305 | 66 | static int process_client_msg(struct command_ctx *cmd_ctx); |
e065084a | 67 | static int send_unix_sock(int sock, void *buf, size_t len); |
62bd06d8 | 68 | static int set_signal_handler(void); |
d6f42150 | 69 | static int set_permissions(void); |
5461b305 | 70 | static int setup_lttng_msg(struct command_ctx *cmd_ctx, size_t size); |
d6f42150 DG |
71 | static int create_lttng_rundir(void); |
72 | static int set_kconsumerd_sockets(void); | |
62bd06d8 | 73 | static void cleanup(void); |
62bd06d8 | 74 | static void sighandler(int sig); |
5461b305 | 75 | static void clean_command_ctx(struct command_ctx *cmd_ctx); |
fac6795d | 76 | |
1fd70b72 DG |
77 | static void *thread_manage_clients(void *data); |
78 | static void *thread_manage_apps(void *data); | |
d6f42150 | 79 | static void *thread_manage_kconsumerd(void *data); |
fac6795d | 80 | |
fac6795d | 81 | /* Variables */ |
62bd06d8 DG |
82 | int opt_verbose; |
83 | int opt_quiet; | |
fac6795d DG |
84 | const char *progname; |
85 | const char *opt_tracing_group; | |
5b8719f5 | 86 | static int opt_sig_parent; |
fac6795d DG |
87 | static int opt_daemon; |
88 | static int is_root; /* Set to 1 if the daemon is running as root */ | |
5b8719f5 | 89 | static pid_t ppid; |
fac6795d | 90 | |
d6f42150 DG |
91 | static char apps_unix_sock_path[PATH_MAX]; /* Global application Unix socket path */ |
92 | static char client_unix_sock_path[PATH_MAX]; /* Global client Unix socket path */ | |
93 | static char kconsumerd_err_unix_sock_path[PATH_MAX]; /* kconsumerd error Unix socket path */ | |
94 | static char kconsumerd_cmd_unix_sock_path[PATH_MAX]; /* kconsumerd command Unix socket path */ | |
fac6795d | 95 | |
d6f42150 DG |
96 | static int client_sock; |
97 | static int apps_sock; | |
98 | static int kconsumerd_err_sock; | |
20fe2104 | 99 | static int kernel_tracer_fd; |
fac6795d | 100 | |
d6f42150 DG |
101 | /* |
102 | * thread_manage_kconsumerd | |
103 | * | |
104 | * This thread manage the kconsumerd error sent | |
105 | * back to the session daemon. | |
106 | */ | |
107 | static void *thread_manage_kconsumerd(void *data) | |
108 | { | |
109 | int sock, ret; | |
110 | ||
111 | DBG("[thread] Manage kconsumerd started"); | |
112 | ||
113 | ret = lttcomm_listen_unix_sock(kconsumerd_err_sock); | |
114 | if (ret < 0) { | |
115 | goto error; | |
116 | } | |
117 | ||
118 | sock = lttcomm_accept_unix_sock(kconsumerd_err_sock); | |
119 | if (sock < 0) { | |
120 | goto error; | |
121 | } | |
122 | ||
123 | while (1) { | |
124 | //ret = lttcomm_recv_unix_sock(sock, &lsm, sizeof(lsm)); | |
125 | if (ret <= 0) { | |
126 | /* TODO: Consumerd died? */ | |
127 | continue; | |
128 | } | |
129 | } | |
130 | ||
131 | error: | |
132 | return NULL; | |
133 | } | |
134 | ||
fac6795d DG |
135 | /* |
136 | * thread_manage_apps | |
137 | * | |
138 | * This thread manage the application socket communication | |
139 | */ | |
140 | static void *thread_manage_apps(void *data) | |
141 | { | |
142 | int sock, ret; | |
fac6795d DG |
143 | |
144 | /* TODO: Something more elegant is needed but fine for now */ | |
5e16da05 MD |
145 | /* FIXME: change all types to either uint8_t, uint32_t, uint64_t |
146 | * for 32-bit vs 64-bit compat processes. */ | |
147 | /* replicate in ust with version number */ | |
686204ab | 148 | struct { |
fac6795d | 149 | int reg; /* 1:register, 0:unregister */ |
686204ab MD |
150 | pid_t pid; |
151 | uid_t uid; | |
152 | } reg_msg; | |
fac6795d | 153 | |
e07ae692 DG |
154 | DBG("[thread] Manage apps started"); |
155 | ||
d6f42150 | 156 | ret = lttcomm_listen_unix_sock(apps_sock); |
fac6795d DG |
157 | if (ret < 0) { |
158 | goto error; | |
159 | } | |
160 | ||
5e16da05 MD |
161 | /* Notify all applications to register */ |
162 | notify_apps(default_global_apps_pipe); | |
163 | ||
fac6795d | 164 | while (1) { |
894be886 | 165 | DBG("Accepting application registration"); |
fac6795d | 166 | /* Blocking call, waiting for transmission */ |
d6f42150 | 167 | sock = lttcomm_accept_unix_sock(apps_sock); |
fac6795d DG |
168 | if (sock < 0) { |
169 | goto error; | |
170 | } | |
171 | ||
172 | /* Basic recv here to handle the very simple data | |
173 | * that the libust send to register (reg_msg). | |
174 | */ | |
175 | ret = recv(sock, ®_msg, sizeof(reg_msg), 0); | |
176 | if (ret < 0) { | |
177 | perror("recv"); | |
178 | continue; | |
179 | } | |
180 | ||
181 | /* Add application to the global traceable list */ | |
182 | if (reg_msg.reg == 1) { | |
183 | /* Registering */ | |
91d76f53 DG |
184 | ret = register_traceable_app(reg_msg.pid, reg_msg.uid); |
185 | if (ret < 0) { | |
186 | /* register_traceable_app only return an error with | |
187 | * ENOMEM. At this point, we better stop everything. | |
188 | */ | |
189 | goto error; | |
190 | } | |
fac6795d DG |
191 | } else { |
192 | /* Unregistering */ | |
91d76f53 | 193 | unregister_traceable_app(reg_msg.pid); |
fac6795d DG |
194 | } |
195 | } | |
196 | ||
197 | error: | |
198 | ||
199 | return NULL; | |
200 | } | |
201 | ||
202 | /* | |
203 | * thread_manage_clients | |
204 | * | |
205 | * This thread manage all clients request using the unix | |
206 | * client socket for communication. | |
207 | */ | |
208 | static void *thread_manage_clients(void *data) | |
209 | { | |
210 | int sock, ret; | |
5461b305 | 211 | struct command_ctx *cmd_ctx; |
fac6795d | 212 | |
e07ae692 DG |
213 | DBG("[thread] Manage client started"); |
214 | ||
d6f42150 | 215 | ret = lttcomm_listen_unix_sock(client_sock); |
fac6795d DG |
216 | if (ret < 0) { |
217 | goto error; | |
218 | } | |
219 | ||
5b8719f5 DG |
220 | /* Notify parent pid that we are ready |
221 | * to accept command for client side. | |
222 | */ | |
223 | if (opt_sig_parent) { | |
224 | kill(ppid, SIGCHLD); | |
225 | } | |
226 | ||
fac6795d DG |
227 | while (1) { |
228 | /* Blocking call, waiting for transmission */ | |
5461b305 | 229 | DBG("Accepting client command ..."); |
d6f42150 | 230 | sock = lttcomm_accept_unix_sock(client_sock); |
fac6795d DG |
231 | if (sock < 0) { |
232 | goto error; | |
233 | } | |
234 | ||
5461b305 DG |
235 | /* Allocate context command to process the client request */ |
236 | cmd_ctx = malloc(sizeof(struct command_ctx)); | |
237 | ||
238 | /* Allocate data buffer for reception */ | |
239 | cmd_ctx->lsm = malloc(sizeof(struct lttcomm_session_msg)); | |
240 | cmd_ctx->llm = NULL; | |
241 | cmd_ctx->session = NULL; | |
242 | ||
fac6795d DG |
243 | /* |
244 | * Data is received from the lttng client. The struct | |
5461b305 DG |
245 | * lttcomm_session_msg (lsm) contains the command and data request of |
246 | * the client. | |
fac6795d | 247 | */ |
5461b305 DG |
248 | DBG("Receiving data from client ..."); |
249 | ret = lttcomm_recv_unix_sock(sock, cmd_ctx->lsm, sizeof(struct lttcomm_session_msg)); | |
87378cf5 | 250 | if (ret <= 0) { |
fac6795d DG |
251 | continue; |
252 | } | |
253 | ||
5461b305 DG |
254 | /* |
255 | * This function dispatch the work to the kernel or userspace tracer | |
256 | * libs and fill the lttcomm_lttng_msg data structure of all the needed | |
257 | * informations for the client. The command context struct contains | |
258 | * everything this function may needs. | |
fac6795d | 259 | */ |
5461b305 | 260 | ret = process_client_msg(cmd_ctx); |
e065084a | 261 | if (ret < 0) { |
5461b305 DG |
262 | /* TODO: Inform client somehow of the fatal error. At this point, |
263 | * ret < 0 means that a malloc failed (ENOMEM). */ | |
e065084a | 264 | /* Error detected but still accept command */ |
5461b305 | 265 | clean_command_ctx(cmd_ctx); |
e065084a | 266 | continue; |
fac6795d | 267 | } |
5461b305 | 268 | |
894be886 DG |
269 | DBG("Sending response (size: %d, retcode: %d)", |
270 | cmd_ctx->lttng_msg_size, cmd_ctx->llm->ret_code); | |
5461b305 DG |
271 | ret = send_unix_sock(sock, cmd_ctx->llm, cmd_ctx->lttng_msg_size); |
272 | if (ret < 0) { | |
273 | ERR("Failed to send data back to client"); | |
274 | } | |
275 | ||
276 | clean_command_ctx(cmd_ctx); | |
fac6795d DG |
277 | } |
278 | ||
279 | error: | |
280 | return NULL; | |
281 | } | |
282 | ||
e065084a DG |
283 | /* |
284 | * send_unix_sock | |
285 | * | |
286 | * Send data on a unix socket using the liblttsessiondcomm API. | |
287 | * | |
288 | * Return lttcomm error code. | |
289 | */ | |
290 | static int send_unix_sock(int sock, void *buf, size_t len) | |
291 | { | |
292 | /* Check valid length */ | |
293 | if (len <= 0) { | |
294 | return -1; | |
295 | } | |
296 | ||
297 | return lttcomm_send_unix_sock(sock, buf, len); | |
298 | } | |
299 | ||
5461b305 DG |
300 | /* |
301 | * clean_command_ctx | |
302 | * | |
303 | * Free memory of a command context structure. | |
304 | */ | |
305 | static void clean_command_ctx(struct command_ctx *cmd_ctx) | |
306 | { | |
307 | DBG("Clean command context structure %p", cmd_ctx); | |
308 | if (cmd_ctx) { | |
309 | if (cmd_ctx->llm) { | |
310 | free(cmd_ctx->llm); | |
311 | } | |
312 | if (cmd_ctx->lsm) { | |
313 | free(cmd_ctx->lsm); | |
314 | } | |
315 | free(cmd_ctx); | |
316 | cmd_ctx = NULL; | |
317 | } | |
318 | } | |
319 | ||
fac6795d | 320 | /* |
471d1693 | 321 | * ust_connect_app |
fac6795d DG |
322 | * |
323 | * Return a socket connected to the libust communication socket | |
324 | * of the application identified by the pid. | |
379473d2 DG |
325 | * |
326 | * If the pid is not found in the traceable list, | |
327 | * return -1 to indicate error. | |
fac6795d | 328 | */ |
471d1693 | 329 | static int ust_connect_app(pid_t pid) |
fac6795d | 330 | { |
91d76f53 DG |
331 | int sock; |
332 | struct ltt_traceable_app *lta; | |
379473d2 | 333 | |
e07ae692 DG |
334 | DBG("Connect to application pid %d", pid); |
335 | ||
91d76f53 DG |
336 | lta = find_app_by_pid(pid); |
337 | if (lta == NULL) { | |
338 | /* App not found */ | |
7442b2ba | 339 | DBG("Application pid %d not found", pid); |
379473d2 DG |
340 | return -1; |
341 | } | |
fac6795d | 342 | |
91d76f53 | 343 | sock = ustctl_connect_pid(lta->pid); |
fac6795d | 344 | if (sock < 0) { |
75462a81 | 345 | ERR("Fail connecting to the PID %d\n", pid); |
fac6795d DG |
346 | } |
347 | ||
348 | return sock; | |
349 | } | |
350 | ||
351 | /* | |
352 | * notify_apps | |
353 | * | |
354 | * Notify apps by writing 42 to a named pipe using name. | |
355 | * Every applications waiting for a ltt-sessiond will be notified | |
356 | * and re-register automatically to the session daemon. | |
357 | * | |
358 | * Return open or write error value. | |
359 | */ | |
360 | static int notify_apps(const char *name) | |
361 | { | |
362 | int fd; | |
363 | int ret = -1; | |
364 | ||
e07ae692 DG |
365 | DBG("Notify the global application pipe"); |
366 | ||
fac6795d DG |
367 | /* Try opening the global pipe */ |
368 | fd = open(name, O_WRONLY); | |
369 | if (fd < 0) { | |
370 | goto error; | |
371 | } | |
372 | ||
373 | /* Notify by writing on the pipe */ | |
374 | ret = write(fd, "42", 2); | |
375 | if (ret < 0) { | |
376 | perror("write"); | |
377 | } | |
378 | ||
379 | error: | |
380 | return ret; | |
381 | } | |
382 | ||
e065084a | 383 | /* |
5461b305 | 384 | * setup_lttng_msg |
ca95a216 | 385 | * |
5461b305 DG |
386 | * Setup the outgoing data buffer for the response (llm) by allocating the |
387 | * right amount of memory and copying the original information from the lsm | |
388 | * structure. | |
ca95a216 DG |
389 | * |
390 | * Return total size of the buffer pointed by buf. | |
391 | */ | |
5461b305 | 392 | static int setup_lttng_msg(struct command_ctx *cmd_ctx, size_t size) |
ca95a216 | 393 | { |
5461b305 | 394 | int ret, buf_size, trace_name_size; |
ca95a216 | 395 | |
5461b305 DG |
396 | /* |
397 | * Check for the trace_name. If defined, it's part of the payload data of | |
398 | * the llm structure. | |
399 | */ | |
400 | trace_name_size = strlen(cmd_ctx->lsm->trace_name); | |
401 | buf_size = trace_name_size + size; | |
402 | ||
403 | cmd_ctx->llm = malloc(sizeof(struct lttcomm_lttng_msg) + buf_size); | |
404 | if (cmd_ctx->llm == NULL) { | |
ca95a216 | 405 | perror("malloc"); |
5461b305 | 406 | ret = -ENOMEM; |
ca95a216 DG |
407 | goto error; |
408 | } | |
409 | ||
5461b305 DG |
410 | /* Copy common data */ |
411 | cmd_ctx->llm->cmd_type = cmd_ctx->lsm->cmd_type; | |
412 | cmd_ctx->llm->pid = cmd_ctx->lsm->pid; | |
413 | if (!uuid_is_null(cmd_ctx->lsm->session_uuid)) { | |
414 | uuid_copy(cmd_ctx->llm->session_uuid, cmd_ctx->lsm->session_uuid); | |
415 | } | |
416 | ||
417 | cmd_ctx->llm->trace_name_offset = trace_name_size; | |
418 | cmd_ctx->llm->data_size = size; | |
419 | cmd_ctx->lttng_msg_size = sizeof(struct lttcomm_lttng_msg) + buf_size; | |
420 | ||
421 | /* Copy trace name to the llm structure. Begining of the payload. */ | |
422 | memcpy(cmd_ctx->llm->payload, cmd_ctx->lsm->trace_name, trace_name_size); | |
ca95a216 DG |
423 | |
424 | return buf_size; | |
425 | ||
426 | error: | |
427 | return ret; | |
428 | } | |
429 | ||
fac6795d DG |
430 | /* |
431 | * process_client_msg | |
432 | * | |
5461b305 DG |
433 | * Process the command requested by the lttng client within the command |
434 | * context structure. This function make sure that the return structure (llm) | |
435 | * is set and ready for transmission before returning. | |
fac6795d | 436 | * |
e065084a | 437 | * Return any error encountered or 0 for success. |
fac6795d | 438 | */ |
5461b305 | 439 | static int process_client_msg(struct command_ctx *cmd_ctx) |
fac6795d | 440 | { |
5461b305 | 441 | int ret; |
fac6795d | 442 | |
5461b305 | 443 | DBG("Processing client command %d", cmd_ctx->lsm->cmd_type); |
fac6795d | 444 | |
379473d2 | 445 | /* Check command that needs a session */ |
5461b305 | 446 | switch (cmd_ctx->lsm->cmd_type) { |
5e16da05 MD |
447 | case LTTNG_CREATE_SESSION: |
448 | case LTTNG_LIST_SESSIONS: | |
449 | case UST_LIST_APPS: | |
450 | break; | |
451 | default: | |
5461b305 DG |
452 | cmd_ctx->session = find_session_by_uuid(cmd_ctx->lsm->session_uuid); |
453 | if (cmd_ctx->session == NULL) { | |
379473d2 | 454 | ret = LTTCOMM_SELECT_SESS; |
5461b305 | 455 | goto error; |
379473d2 | 456 | } |
5e16da05 | 457 | break; |
379473d2 DG |
458 | } |
459 | ||
20fe2104 DG |
460 | /* Check command for kernel tracing */ |
461 | switch (cmd_ctx->lsm->cmd_type) { | |
462 | case KERNEL_CREATE_SESSION: | |
463 | case KERNEL_CREATE_CHANNEL: | |
464 | if (kernel_tracer_fd == 0) { | |
465 | ret = LTTCOMM_KERN_NA; | |
466 | goto error; | |
467 | } | |
468 | break; | |
469 | } | |
470 | ||
471d1693 | 471 | /* Connect to ust apps if available pid */ |
5461b305 | 472 | if (cmd_ctx->lsm->pid > 0) { |
471d1693 | 473 | /* Connect to app using ustctl API */ |
5461b305 DG |
474 | cmd_ctx->ust_sock = ust_connect_app(cmd_ctx->lsm->pid); |
475 | if (cmd_ctx->ust_sock < 0) { | |
471d1693 | 476 | ret = LTTCOMM_NO_TRACEABLE; |
5461b305 | 477 | goto error; |
471d1693 DG |
478 | } |
479 | } | |
480 | ||
fac6795d | 481 | /* Process by command type */ |
5461b305 | 482 | switch (cmd_ctx->lsm->cmd_type) { |
20fe2104 DG |
483 | case KERNEL_CREATE_SESSION: |
484 | { | |
485 | ret = setup_lttng_msg(cmd_ctx, 0); | |
486 | if (ret < 0) { | |
487 | goto setup_error; | |
488 | } | |
489 | ||
490 | DBG("Creating kernel session"); | |
491 | ||
492 | ret = kernel_create_session(cmd_ctx, kernel_tracer_fd); | |
493 | if (ret < 0) { | |
494 | ret = LTTCOMM_KERN_SESS_FAIL; | |
495 | goto error; | |
496 | } | |
497 | ||
498 | ret = LTTCOMM_OK; | |
499 | break; | |
500 | } | |
501 | case KERNEL_CREATE_CHANNEL: | |
502 | { | |
503 | ret = setup_lttng_msg(cmd_ctx, 0); | |
504 | if (ret < 0) { | |
505 | goto setup_error; | |
506 | } | |
507 | ||
508 | DBG("Creating kernel session"); | |
509 | ||
510 | ret = kernel_create_channel(cmd_ctx); | |
511 | if (ret < 0) { | |
512 | ret = LTTCOMM_KERN_CHAN_FAIL; | |
513 | goto error; | |
514 | } | |
515 | ||
516 | ret = LTTCOMM_OK; | |
517 | break; | |
518 | } | |
894be886 DG |
519 | case KERNEL_ENABLE_EVENT: |
520 | { | |
521 | /* Setup lttng message with no payload */ | |
522 | ret = setup_lttng_msg(cmd_ctx, 0); | |
523 | if (ret < 0) { | |
524 | goto setup_error; | |
525 | } | |
526 | ||
527 | DBG("Enabling kernel event %s", cmd_ctx->lsm->u.event.event_name); | |
528 | ||
f34daff7 DG |
529 | ret = kernel_enable_event(cmd_ctx->session->kernel_session->channel, cmd_ctx->lsm->u.event.event_name); |
530 | if (ret < 0) { | |
531 | ret = LTTCOMM_KERN_ENABLE_FAIL; | |
532 | goto error; | |
533 | } | |
534 | ||
894be886 DG |
535 | ret = LTTCOMM_OK; |
536 | break; | |
537 | } | |
5e16da05 MD |
538 | case LTTNG_CREATE_SESSION: |
539 | { | |
5461b305 DG |
540 | /* Setup lttng message with no payload */ |
541 | ret = setup_lttng_msg(cmd_ctx, 0); | |
542 | if (ret < 0) { | |
543 | goto setup_error; | |
544 | } | |
545 | ||
546 | ret = create_session(cmd_ctx->lsm->session_name, &cmd_ctx->llm->session_uuid); | |
5e16da05 MD |
547 | if (ret < 0) { |
548 | if (ret == -1) { | |
549 | ret = LTTCOMM_EXIST_SESS; | |
550 | } else { | |
aaf97519 | 551 | ret = LTTCOMM_FATAL; |
aaf97519 | 552 | } |
5461b305 | 553 | goto error; |
8028d920 | 554 | } |
1657e9bb | 555 | |
5461b305 | 556 | ret = LTTCOMM_OK; |
5e16da05 MD |
557 | break; |
558 | } | |
559 | case LTTNG_DESTROY_SESSION: | |
560 | { | |
5461b305 DG |
561 | /* Setup lttng message with no payload */ |
562 | ret = setup_lttng_msg(cmd_ctx, 0); | |
563 | if (ret < 0) { | |
564 | goto setup_error; | |
565 | } | |
566 | ||
567 | ret = destroy_session(&cmd_ctx->lsm->session_uuid); | |
5e16da05 MD |
568 | if (ret < 0) { |
569 | ret = LTTCOMM_NO_SESS; | |
5461b305 | 570 | goto error; |
5e16da05 | 571 | } |
1657e9bb | 572 | |
5461b305 DG |
573 | ret = LTTCOMM_OK; |
574 | break; | |
5e16da05 MD |
575 | } |
576 | case LTTNG_LIST_TRACES: | |
577 | { | |
5461b305 | 578 | unsigned int trace_count; |
1657e9bb | 579 | |
5461b305 | 580 | trace_count = get_trace_count_per_session(cmd_ctx->session); |
5e16da05 MD |
581 | if (trace_count == 0) { |
582 | ret = LTTCOMM_NO_TRACE; | |
5461b305 | 583 | goto error; |
1657e9bb | 584 | } |
df0da139 | 585 | |
5461b305 DG |
586 | ret = setup_lttng_msg(cmd_ctx, sizeof(struct lttng_trace) * trace_count); |
587 | if (ret < 0) { | |
588 | goto setup_error; | |
df0da139 | 589 | } |
ca95a216 | 590 | |
5461b305 DG |
591 | get_traces_per_session(cmd_ctx->session, |
592 | (struct lttng_trace *)(cmd_ctx->llm->payload)); | |
593 | ||
594 | ret = LTTCOMM_OK; | |
5e16da05 MD |
595 | break; |
596 | } | |
597 | case UST_CREATE_TRACE: | |
598 | { | |
5461b305 DG |
599 | /* Setup lttng message with no payload */ |
600 | ret = setup_lttng_msg(cmd_ctx, 0); | |
5e16da05 | 601 | if (ret < 0) { |
5461b305 | 602 | goto setup_error; |
fac6795d | 603 | } |
ce3d728c | 604 | |
5461b305 DG |
605 | ret = ust_create_trace(cmd_ctx); |
606 | if (ret < 0) { | |
607 | goto setup_error; | |
608 | } | |
609 | break; | |
5e16da05 MD |
610 | } |
611 | case UST_LIST_APPS: | |
612 | { | |
5461b305 DG |
613 | unsigned int app_count; |
614 | ||
615 | app_count = get_app_count(); | |
616 | DBG("Traceable application count : %d", app_count); | |
5e16da05 MD |
617 | if (app_count == 0) { |
618 | ret = LTTCOMM_NO_APPS; | |
5461b305 | 619 | goto error; |
ce3d728c | 620 | } |
520ff687 | 621 | |
5461b305 DG |
622 | ret = setup_lttng_msg(cmd_ctx, sizeof(pid_t) * app_count); |
623 | if (ret < 0) { | |
624 | goto setup_error; | |
520ff687 | 625 | } |
57167058 | 626 | |
5461b305 | 627 | get_app_list_pids((pid_t *)(cmd_ctx->llm->payload)); |
5e16da05 | 628 | |
5461b305 | 629 | ret = LTTCOMM_OK; |
5e16da05 MD |
630 | break; |
631 | } | |
632 | case UST_START_TRACE: | |
633 | { | |
5461b305 DG |
634 | /* Setup lttng message with no payload */ |
635 | ret = setup_lttng_msg(cmd_ctx, 0); | |
636 | if (ret < 0) { | |
637 | goto setup_error; | |
638 | } | |
ca95a216 | 639 | |
5461b305 DG |
640 | ret = ust_start_trace(cmd_ctx); |
641 | if (ret < 0) { | |
642 | goto setup_error; | |
643 | } | |
644 | break; | |
5e16da05 MD |
645 | } |
646 | case UST_STOP_TRACE: | |
647 | { | |
5461b305 DG |
648 | /* Setup lttng message with no payload */ |
649 | ret = setup_lttng_msg(cmd_ctx, 0); | |
650 | if (ret < 0) { | |
651 | goto setup_error; | |
652 | } | |
ca95a216 | 653 | |
5461b305 DG |
654 | ret = ust_stop_trace(cmd_ctx); |
655 | if (ret < 0) { | |
656 | goto setup_error; | |
657 | } | |
658 | break; | |
5e16da05 MD |
659 | } |
660 | case LTTNG_LIST_SESSIONS: | |
661 | { | |
5461b305 DG |
662 | unsigned int session_count; |
663 | ||
664 | session_count = get_session_count(); | |
5e16da05 MD |
665 | if (session_count == 0) { |
666 | ret = LTTCOMM_NO_SESS; | |
5461b305 | 667 | goto error; |
57167058 | 668 | } |
5e16da05 | 669 | |
5461b305 DG |
670 | ret = setup_lttng_msg(cmd_ctx, sizeof(struct lttng_session) * session_count); |
671 | if (ret < 0) { | |
672 | goto setup_error; | |
e065084a | 673 | } |
5e16da05 | 674 | |
5461b305 | 675 | get_lttng_session((struct lttng_session *)(cmd_ctx->llm->payload)); |
5e16da05 | 676 | |
5461b305 | 677 | ret = LTTCOMM_OK; |
5e16da05 MD |
678 | break; |
679 | } | |
680 | default: | |
681 | /* Undefined command */ | |
5461b305 DG |
682 | ret = setup_lttng_msg(cmd_ctx, 0); |
683 | if (ret < 0) { | |
684 | goto setup_error; | |
685 | } | |
686 | ||
5e16da05 | 687 | ret = LTTCOMM_UND; |
5461b305 | 688 | break; |
fac6795d DG |
689 | } |
690 | ||
5461b305 DG |
691 | /* Set return code */ |
692 | cmd_ctx->llm->ret_code = ret; | |
ca95a216 | 693 | |
e065084a DG |
694 | return ret; |
695 | ||
5461b305 | 696 | error: |
5461b305 DG |
697 | if (cmd_ctx->llm == NULL) { |
698 | DBG("Missing llm structure. Allocating one."); | |
894be886 | 699 | if (setup_lttng_msg(cmd_ctx, 0) < 0) { |
5461b305 DG |
700 | goto setup_error; |
701 | } | |
702 | } | |
e065084a | 703 | /* Notify client of error */ |
5461b305 | 704 | cmd_ctx->llm->ret_code = ret; |
e065084a | 705 | |
5461b305 | 706 | setup_error: |
8028d920 | 707 | return ret; |
fac6795d DG |
708 | } |
709 | ||
710 | /* | |
711 | * usage function on stderr | |
712 | */ | |
713 | static void usage(void) | |
714 | { | |
b716ce68 | 715 | fprintf(stderr, "Usage: %s OPTIONS\n\nOptions:\n", progname); |
d6f42150 DG |
716 | fprintf(stderr, " -h, --help Display this usage.\n"); |
717 | fprintf(stderr, " -c, --client-sock PATH Specify path for the client unix socket\n"); | |
718 | fprintf(stderr, " -a, --apps-sock PATH Specify path for apps unix socket\n"); | |
719 | fprintf(stderr, " --kconsumerd-err-sock PATH Specify path for the kernel consumer error socket\n"); | |
720 | fprintf(stderr, " --kconsumerd-cmd-sock PATH Specify path for the kernel consumer command socket\n"); | |
721 | fprintf(stderr, " -d, --daemonize Start as a daemon.\n"); | |
722 | fprintf(stderr, " -g, --group NAME Specify the tracing group name. (default: tracing)\n"); | |
723 | fprintf(stderr, " -V, --version Show version number.\n"); | |
724 | fprintf(stderr, " -S, --sig-parent Send SIGCHLD to parent pid to notify readiness.\n"); | |
725 | fprintf(stderr, " -q, --quiet No output at all.\n"); | |
726 | fprintf(stderr, " -v, --verbose Verbose mode. Activate DBG() macro.\n"); | |
fac6795d DG |
727 | } |
728 | ||
729 | /* | |
730 | * daemon argument parsing | |
731 | */ | |
732 | static int parse_args(int argc, char **argv) | |
733 | { | |
734 | int c; | |
735 | ||
736 | static struct option long_options[] = { | |
737 | { "client-sock", 1, 0, 'c' }, | |
738 | { "apps-sock", 1, 0, 'a' }, | |
d6f42150 DG |
739 | { "kconsumerd-cmd-sock", 1, 0, 0 }, |
740 | { "kconsumerd-err-sock", 1, 0, 0 }, | |
fac6795d | 741 | { "daemonize", 0, 0, 'd' }, |
5b8719f5 | 742 | { "sig-parent", 0, 0, 'S' }, |
fac6795d DG |
743 | { "help", 0, 0, 'h' }, |
744 | { "group", 1, 0, 'g' }, | |
745 | { "version", 0, 0, 'V' }, | |
75462a81 | 746 | { "quiet", 0, 0, 'q' }, |
3f9947db | 747 | { "verbose", 0, 0, 'v' }, |
fac6795d DG |
748 | { NULL, 0, 0, 0 } |
749 | }; | |
750 | ||
751 | while (1) { | |
752 | int option_index = 0; | |
d6f42150 | 753 | c = getopt_long(argc, argv, "dhqvVS" "a:c:g:s:E:C:", long_options, &option_index); |
fac6795d DG |
754 | if (c == -1) { |
755 | break; | |
756 | } | |
757 | ||
758 | switch (c) { | |
759 | case 0: | |
760 | fprintf(stderr, "option %s", long_options[option_index].name); | |
761 | if (optarg) { | |
762 | fprintf(stderr, " with arg %s\n", optarg); | |
763 | } | |
764 | break; | |
b716ce68 | 765 | case 'c': |
fac6795d DG |
766 | snprintf(client_unix_sock_path, PATH_MAX, "%s", optarg); |
767 | break; | |
768 | case 'a': | |
769 | snprintf(apps_unix_sock_path, PATH_MAX, "%s", optarg); | |
770 | break; | |
771 | case 'd': | |
772 | opt_daemon = 1; | |
773 | break; | |
774 | case 'g': | |
775 | opt_tracing_group = strdup(optarg); | |
776 | break; | |
777 | case 'h': | |
778 | usage(); | |
779 | exit(EXIT_FAILURE); | |
780 | case 'V': | |
781 | fprintf(stdout, "%s\n", VERSION); | |
782 | exit(EXIT_SUCCESS); | |
5b8719f5 DG |
783 | case 'S': |
784 | opt_sig_parent = 1; | |
785 | break; | |
d6f42150 DG |
786 | case 'E': |
787 | snprintf(kconsumerd_err_unix_sock_path, PATH_MAX, "%s", optarg); | |
788 | break; | |
789 | case 'C': | |
790 | snprintf(kconsumerd_cmd_unix_sock_path, PATH_MAX, "%s", optarg); | |
791 | break; | |
75462a81 DG |
792 | case 'q': |
793 | opt_quiet = 1; | |
794 | break; | |
3f9947db DG |
795 | case 'v': |
796 | opt_verbose = 1; | |
797 | break; | |
fac6795d DG |
798 | default: |
799 | /* Unknown option or other error. | |
800 | * Error is printed by getopt, just return */ | |
801 | return -1; | |
802 | } | |
803 | } | |
804 | ||
805 | return 0; | |
806 | } | |
807 | ||
808 | /* | |
809 | * init_daemon_socket | |
810 | * | |
811 | * Creates the two needed socket by the daemon. | |
d6f42150 DG |
812 | * apps_sock - The communication socket for all UST apps. |
813 | * client_sock - The communication of the cli tool (lttng). | |
fac6795d DG |
814 | */ |
815 | static int init_daemon_socket() | |
816 | { | |
817 | int ret = 0; | |
818 | mode_t old_umask; | |
819 | ||
820 | old_umask = umask(0); | |
821 | ||
822 | /* Create client tool unix socket */ | |
d6f42150 DG |
823 | client_sock = lttcomm_create_unix_sock(client_unix_sock_path); |
824 | if (client_sock < 0) { | |
825 | ERR("Create unix sock failed: %s", client_unix_sock_path); | |
fac6795d DG |
826 | ret = -1; |
827 | goto end; | |
828 | } | |
829 | ||
830 | /* File permission MUST be 660 */ | |
831 | ret = chmod(client_unix_sock_path, S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP); | |
832 | if (ret < 0) { | |
d6f42150 | 833 | ERR("Set file permissions failed: %s", client_unix_sock_path); |
fac6795d DG |
834 | perror("chmod"); |
835 | goto end; | |
836 | } | |
837 | ||
838 | /* Create the application unix socket */ | |
d6f42150 DG |
839 | apps_sock = lttcomm_create_unix_sock(apps_unix_sock_path); |
840 | if (apps_sock < 0) { | |
841 | ERR("Create unix sock failed: %s", apps_unix_sock_path); | |
fac6795d DG |
842 | ret = -1; |
843 | goto end; | |
844 | } | |
845 | ||
d6f42150 | 846 | /* File permission MUST be 666 */ |
fac6795d DG |
847 | ret = chmod(apps_unix_sock_path, S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IROTH | S_IWOTH); |
848 | if (ret < 0) { | |
d6f42150 | 849 | ERR("Set file permissions failed: %s", apps_unix_sock_path); |
fac6795d DG |
850 | perror("chmod"); |
851 | goto end; | |
852 | } | |
853 | ||
854 | end: | |
855 | umask(old_umask); | |
856 | return ret; | |
857 | } | |
858 | ||
859 | /* | |
860 | * check_existing_daemon | |
861 | * | |
862 | * Check if the global socket is available. | |
62bd06d8 | 863 | * If yes, error is returned. |
fac6795d DG |
864 | */ |
865 | static int check_existing_daemon() | |
866 | { | |
867 | int ret; | |
868 | ||
869 | ret = access(client_unix_sock_path, F_OK); | |
870 | if (ret == 0) { | |
871 | ret = access(apps_unix_sock_path, F_OK); | |
872 | } | |
873 | ||
874 | return ret; | |
875 | } | |
876 | ||
877 | /* | |
62bd06d8 | 878 | * get_home_dir |
fac6795d | 879 | * |
62bd06d8 DG |
880 | * Return pointer to home directory path using |
881 | * the env variable HOME. | |
fac6795d | 882 | * |
62bd06d8 | 883 | * Default : /tmp |
fac6795d DG |
884 | */ |
885 | static const char *get_home_dir(void) | |
886 | { | |
887 | const char *home_path; | |
888 | ||
686204ab | 889 | if ((home_path = (const char *) getenv("HOME")) == NULL) { |
fac6795d DG |
890 | home_path = default_home_dir; |
891 | } | |
892 | ||
893 | return home_path; | |
894 | } | |
895 | ||
896 | /* | |
d6f42150 | 897 | * set_permissions |
fac6795d | 898 | * |
5e16da05 MD |
899 | * Set the tracing group gid onto the client socket. |
900 | * | |
901 | * Race window between mkdir and chown is OK because we are going from | |
902 | * less permissive (root.root) to more permissive (root.tracing). | |
fac6795d | 903 | */ |
d6f42150 | 904 | static int set_permissions(void) |
fac6795d DG |
905 | { |
906 | int ret; | |
907 | struct group *grp; | |
908 | ||
909 | /* Decide which group name to use */ | |
910 | (opt_tracing_group != NULL) ? | |
911 | (grp = getgrnam(opt_tracing_group)) : | |
912 | (grp = getgrnam(default_tracing_group)); | |
913 | ||
914 | if (grp == NULL) { | |
75462a81 | 915 | ERR("Missing tracing group. Aborting execution.\n"); |
fac6795d DG |
916 | ret = -1; |
917 | goto end; | |
918 | } | |
919 | ||
d6f42150 DG |
920 | /* Set lttng run dir */ |
921 | ret = chown(LTTNG_RUNDIR, 0, grp->gr_gid); | |
922 | if (ret < 0) { | |
923 | ERR("Unable to set group on " LTTNG_RUNDIR); | |
924 | perror("chown"); | |
925 | } | |
926 | ||
927 | /* lttng client socket path */ | |
fac6795d DG |
928 | ret = chown(client_unix_sock_path, 0, grp->gr_gid); |
929 | if (ret < 0) { | |
d6f42150 DG |
930 | ERR("Unable to set group on %s", client_unix_sock_path); |
931 | perror("chown"); | |
932 | } | |
933 | ||
934 | /* kconsumerd error socket path */ | |
935 | ret = chown(kconsumerd_err_unix_sock_path, 0, grp->gr_gid); | |
936 | if (ret < 0) { | |
937 | ERR("Unable to set group on %s", kconsumerd_err_unix_sock_path); | |
fac6795d DG |
938 | perror("chown"); |
939 | } | |
940 | ||
d6f42150 | 941 | DBG("All permissions are set"); |
e07ae692 | 942 | |
fac6795d DG |
943 | end: |
944 | return ret; | |
945 | } | |
946 | ||
d6f42150 DG |
947 | /* |
948 | * create_lttng_rundir | |
949 | * | |
950 | * Create the lttng run directory needed for all | |
951 | * global sockets and pipe. | |
952 | */ | |
953 | static int create_lttng_rundir(void) | |
954 | { | |
955 | int ret; | |
956 | ||
957 | ret = mkdir(LTTNG_RUNDIR, S_IRWXU | S_IRWXG ); | |
958 | if (ret < 0) { | |
959 | ERR("Unable to create " LTTNG_RUNDIR); | |
960 | goto error; | |
961 | } | |
962 | ||
963 | error: | |
964 | return ret; | |
965 | } | |
966 | ||
20fe2104 DG |
967 | /* |
968 | * init_kernel_tracer | |
969 | * | |
970 | * Setup necessary data for kernel tracer action. | |
971 | */ | |
972 | static void init_kernel_tracer(void) | |
973 | { | |
974 | /* Set the global kernel tracer fd */ | |
975 | kernel_tracer_fd = open(DEFAULT_KERNEL_TRACER_PATH, O_RDWR); | |
976 | if (kernel_tracer_fd < 0) { | |
977 | WARN("No kernel tracer available"); | |
978 | kernel_tracer_fd = 0; | |
979 | } | |
980 | } | |
981 | ||
d6f42150 DG |
982 | /* |
983 | * set_kconsumerd_sockets | |
984 | * | |
985 | * Setup sockets and directory needed by the kconsumerd | |
986 | * communication with the session daemon. | |
987 | */ | |
988 | static int set_kconsumerd_sockets(void) | |
989 | { | |
990 | int ret; | |
991 | ||
992 | if (strlen(kconsumerd_err_unix_sock_path) == 0) { | |
993 | snprintf(kconsumerd_err_unix_sock_path, PATH_MAX, KCONSUMERD_ERR_SOCK_PATH); | |
994 | } | |
995 | ||
996 | if (strlen(kconsumerd_cmd_unix_sock_path) == 0) { | |
997 | snprintf(kconsumerd_cmd_unix_sock_path, PATH_MAX, KCONSUMERD_CMD_SOCK_PATH); | |
998 | } | |
999 | ||
1000 | ret = mkdir(KCONSUMERD_PATH, S_IRWXU | S_IRWXG); | |
1001 | if (ret < 0) { | |
1002 | ERR("Failed to create " KCONSUMERD_PATH); | |
1003 | goto error; | |
1004 | } | |
1005 | ||
1006 | /* Create the kconsumerd error unix socket */ | |
1007 | kconsumerd_err_sock = lttcomm_create_unix_sock(kconsumerd_err_unix_sock_path); | |
1008 | if (kconsumerd_err_sock < 0) { | |
1009 | ERR("Create unix sock failed: %s", kconsumerd_err_unix_sock_path); | |
1010 | ret = -1; | |
1011 | goto error; | |
1012 | } | |
1013 | ||
1014 | /* File permission MUST be 660 */ | |
1015 | ret = chmod(kconsumerd_err_unix_sock_path, S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP); | |
1016 | if (ret < 0) { | |
1017 | ERR("Set file permissions failed: %s", kconsumerd_err_unix_sock_path); | |
1018 | perror("chmod"); | |
1019 | goto error; | |
1020 | } | |
1021 | ||
1022 | error: | |
1023 | return ret; | |
1024 | } | |
1025 | ||
fac6795d | 1026 | /* |
62bd06d8 | 1027 | * set_signal_handler |
fac6795d | 1028 | * |
62bd06d8 | 1029 | * Setup signal handler for : |
fac6795d DG |
1030 | * SIGINT, SIGTERM, SIGPIPE |
1031 | */ | |
1032 | static int set_signal_handler(void) | |
1033 | { | |
1034 | int ret = 0; | |
1035 | struct sigaction sa; | |
1036 | sigset_t sigset; | |
1037 | ||
1038 | if ((ret = sigemptyset(&sigset)) < 0) { | |
1039 | perror("sigemptyset"); | |
1040 | return ret; | |
1041 | } | |
1042 | ||
1043 | sa.sa_handler = sighandler; | |
1044 | sa.sa_mask = sigset; | |
1045 | sa.sa_flags = 0; | |
1046 | if ((ret = sigaction(SIGTERM, &sa, NULL)) < 0) { | |
1047 | perror("sigaction"); | |
1048 | return ret; | |
1049 | } | |
1050 | ||
1051 | if ((ret = sigaction(SIGINT, &sa, NULL)) < 0) { | |
1052 | perror("sigaction"); | |
1053 | return ret; | |
1054 | } | |
1055 | ||
1056 | if ((ret = sigaction(SIGPIPE, &sa, NULL)) < 0) { | |
1057 | perror("sigaction"); | |
1058 | return ret; | |
1059 | } | |
1060 | ||
e07ae692 DG |
1061 | DBG("Signal handler set for SIGTERM, SIGPIPE and SIGINT"); |
1062 | ||
fac6795d DG |
1063 | return ret; |
1064 | } | |
1065 | ||
1066 | /** | |
62bd06d8 | 1067 | * sighandler |
fac6795d | 1068 | * |
62bd06d8 | 1069 | * Signal handler for the daemon |
fac6795d DG |
1070 | */ |
1071 | static void sighandler(int sig) | |
1072 | { | |
1073 | switch (sig) { | |
1074 | case SIGPIPE: | |
e07ae692 | 1075 | DBG("SIGPIPE catched"); |
87378cf5 | 1076 | return; |
fac6795d | 1077 | case SIGINT: |
e07ae692 DG |
1078 | DBG("SIGINT catched"); |
1079 | cleanup(); | |
1080 | break; | |
fac6795d | 1081 | case SIGTERM: |
e07ae692 | 1082 | DBG("SIGTERM catched"); |
fac6795d | 1083 | cleanup(); |
686204ab | 1084 | break; |
fac6795d DG |
1085 | default: |
1086 | break; | |
1087 | } | |
1088 | ||
1089 | exit(EXIT_SUCCESS); | |
1090 | } | |
1091 | ||
1092 | /* | |
62bd06d8 | 1093 | * cleanup |
fac6795d | 1094 | * |
62bd06d8 | 1095 | * Cleanup the daemon on exit |
fac6795d DG |
1096 | */ |
1097 | static void cleanup() | |
1098 | { | |
d6f42150 DG |
1099 | int ret; |
1100 | char *cmd; | |
1101 | ||
e07ae692 DG |
1102 | DBG("Cleaning up"); |
1103 | ||
fac6795d | 1104 | /* <fun> */ |
b716ce68 DG |
1105 | MSG("\n%c[%d;%dm*** assert failed *** ==> %c[%dm", 27,1,31,27,0); |
1106 | MSG("%c[%d;%dmMatthew, BEET driven development works!%c[%dm",27,1,33,27,0); | |
fac6795d DG |
1107 | /* </fun> */ |
1108 | ||
1109 | unlink(client_unix_sock_path); | |
1110 | unlink(apps_unix_sock_path); | |
d6f42150 DG |
1111 | unlink(kconsumerd_err_unix_sock_path); |
1112 | ||
1113 | ret = asprintf(&cmd, "rm -rf " LTTNG_RUNDIR); | |
1114 | if (ret < 0) { | |
1115 | ERR("asprintf failed. Something is really wrong!"); | |
1116 | } | |
1117 | ||
1118 | /* Remove lttng run directory */ | |
1119 | ret = system(cmd); | |
1120 | if (ret < 0) { | |
1121 | ERR("Unable to clean " LTTNG_RUNDIR); | |
1122 | } | |
fac6795d DG |
1123 | } |
1124 | ||
1125 | /* | |
1126 | * main | |
1127 | */ | |
1128 | int main(int argc, char **argv) | |
1129 | { | |
1130 | int i; | |
1131 | int ret = 0; | |
1132 | void *status; | |
1133 | pthread_t threads[2]; | |
1134 | ||
1135 | /* Parse arguments */ | |
1136 | progname = argv[0]; | |
1137 | if ((ret = parse_args(argc, argv) < 0)) { | |
1138 | goto error; | |
1139 | } | |
1140 | ||
1141 | /* Daemonize */ | |
1142 | if (opt_daemon) { | |
53094c05 DG |
1143 | ret = daemon(0, 0); |
1144 | if (ret < 0) { | |
1145 | perror("daemon"); | |
1146 | goto error; | |
1147 | } | |
fac6795d DG |
1148 | } |
1149 | ||
1150 | /* Check if daemon is UID = 0 */ | |
1151 | is_root = !getuid(); | |
1152 | ||
1153 | /* Set all sockets path */ | |
1154 | if (is_root) { | |
d6f42150 DG |
1155 | ret = create_lttng_rundir(); |
1156 | if (ret < 0) { | |
1157 | goto error; | |
1158 | } | |
1159 | ||
fac6795d | 1160 | if (strlen(apps_unix_sock_path) == 0) { |
d6f42150 DG |
1161 | snprintf(apps_unix_sock_path, PATH_MAX, |
1162 | DEFAULT_GLOBAL_APPS_UNIX_SOCK); | |
fac6795d DG |
1163 | } |
1164 | ||
1165 | if (strlen(client_unix_sock_path) == 0) { | |
d6f42150 DG |
1166 | snprintf(client_unix_sock_path, PATH_MAX, |
1167 | DEFAULT_GLOBAL_CLIENT_UNIX_SOCK); | |
1168 | } | |
1169 | ||
1170 | ret = set_kconsumerd_sockets(); | |
1171 | if (ret < 0) { | |
1172 | goto error; | |
fac6795d | 1173 | } |
20fe2104 DG |
1174 | |
1175 | /* Setup kernel tracer */ | |
1176 | init_kernel_tracer(); | |
fac6795d DG |
1177 | } else { |
1178 | if (strlen(apps_unix_sock_path) == 0) { | |
d6f42150 DG |
1179 | snprintf(apps_unix_sock_path, PATH_MAX, |
1180 | DEFAULT_HOME_APPS_UNIX_SOCK, get_home_dir()); | |
fac6795d DG |
1181 | } |
1182 | ||
1183 | /* Set the cli tool unix socket path */ | |
1184 | if (strlen(client_unix_sock_path) == 0) { | |
d6f42150 DG |
1185 | snprintf(client_unix_sock_path, PATH_MAX, |
1186 | DEFAULT_HOME_CLIENT_UNIX_SOCK, get_home_dir()); | |
fac6795d DG |
1187 | } |
1188 | } | |
1189 | ||
847177cd DG |
1190 | DBG("Client socket path %s", client_unix_sock_path); |
1191 | DBG("Application socket path %s", apps_unix_sock_path); | |
1192 | ||
fac6795d DG |
1193 | /* See if daemon already exist. If any of the two |
1194 | * socket needed by the daemon are present, this test fails | |
1195 | */ | |
1196 | if ((ret = check_existing_daemon()) == 0) { | |
75462a81 | 1197 | ERR("Already running daemon.\n"); |
ab118b20 | 1198 | /* We do not goto error because we must not |
d6f42150 | 1199 | * cleanup() because a daemon is already running. |
ab118b20 | 1200 | */ |
5e16da05 | 1201 | exit(EXIT_FAILURE); |
fac6795d DG |
1202 | } |
1203 | ||
1204 | if (set_signal_handler() < 0) { | |
1205 | goto error; | |
1206 | } | |
1207 | ||
d6f42150 | 1208 | /* Setup the needed unix socket */ |
fac6795d DG |
1209 | if (init_daemon_socket() < 0) { |
1210 | goto error; | |
1211 | } | |
1212 | ||
1213 | /* Set credentials to socket */ | |
d6f42150 | 1214 | if (is_root && (set_permissions() < 0)) { |
fac6795d DG |
1215 | goto error; |
1216 | } | |
1217 | ||
5b8719f5 DG |
1218 | /* Get parent pid if -S, --sig-parent is specified. */ |
1219 | if (opt_sig_parent) { | |
1220 | ppid = getppid(); | |
1221 | } | |
1222 | ||
fac6795d DG |
1223 | while (1) { |
1224 | /* Create thread to manage the client socket */ | |
1225 | ret = pthread_create(&threads[0], NULL, thread_manage_clients, (void *) NULL); | |
1226 | if (ret != 0) { | |
1227 | perror("pthread_create"); | |
1228 | goto error; | |
1229 | } | |
1230 | ||
1231 | /* Create thread to manage application socket */ | |
1232 | ret = pthread_create(&threads[1], NULL, thread_manage_apps, (void *) NULL); | |
1233 | if (ret != 0) { | |
1234 | perror("pthread_create"); | |
1235 | goto error; | |
1236 | } | |
1237 | ||
1238 | for (i = 0; i < 2; i++) { | |
1239 | ret = pthread_join(threads[i], &status); | |
1240 | if (ret != 0) { | |
1241 | perror("pthread_join"); | |
1242 | goto error; | |
1243 | } | |
1244 | } | |
1245 | } | |
1246 | ||
1247 | cleanup(); | |
5e16da05 | 1248 | exit(EXIT_SUCCESS); |
fac6795d DG |
1249 | |
1250 | error: | |
1251 | cleanup(); | |
5e16da05 | 1252 | exit(EXIT_FAILURE); |
fac6795d | 1253 | } |