2 * Copyright (C) 2004-2008 Kay Sievers <kay.sievers@vrfy.org>
3 * Copyright (C) 2004 Chris Friesen <chris_friesen@sympatico.ca>
4 * Copyright (C) 2009 Canonical Ltd.
5 * Copyright (C) 2009 Scott James Remnant <scott@netsplit.com>
7 * This program is free software: you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation, either version 2 of the License, or
10 * (at your option) any later version.
12 * This program is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU General Public License for more details.
17 * You should have received a copy of the GNU General Public License
18 * along with this program. If not, see <http://www.gnu.org/licenses/>.
33 #include <sys/select.h>
37 #include <sys/ioctl.h>
39 #include <sys/inotify.h>
44 #define UDEVD_PRIORITY -4
45 #define UDEV_PRIORITY -2
47 /* maximum limit of forked childs */
48 #define UDEVD_MAX_CHILDS 256
52 static void log_fn(struct udev
*udev
, int priority
,
53 const char *file
, int line
, const char *fn
,
54 const char *format
, va_list args
)
57 fprintf(stderr
, "[%d] %s: ", (int) getpid(), fn
);
58 vfprintf(stderr
, format
, args
);
60 vsyslog(priority
, format
, args
);
64 static void reap_sigchilds(void);
66 static int debug_trace
;
67 static struct udev_rules
*rules
;
68 static struct udev_ctrl
*udev_ctrl
;
69 static struct udev_monitor
*kernel_monitor
;
70 static volatile int sigchilds_waiting
;
71 static volatile int udev_exit
;
72 static volatile int reload_config
;
73 static volatile int signal_received
;
74 static volatile pid_t settle_pid
;
75 static int run_exec_q
;
76 static int stop_exec_q
;
77 static int max_childs
;
79 static struct udev_list_node event_list
;
87 static struct udev_event
*node_to_event(struct udev_list_node
*node
)
92 event
-= offsetof(struct udev_event
, node
);
93 return (struct udev_event
*)event
;
96 static void export_event_state(struct udev_event
*event
, enum event_state state
)
98 char filename
[UTIL_PATH_SIZE
];
99 char filename_failed
[UTIL_PATH_SIZE
];
102 /* location of queue file */
103 snprintf(filename
, sizeof(filename
), "%s/.udev/queue/%llu",
104 udev_get_dev_path(event
->udev
), udev_device_get_seqnum(event
->dev
));
106 /* location of failed file */
107 util_strlcpy(filename_failed
, udev_get_dev_path(event
->udev
), sizeof(filename_failed
));
108 util_strlcat(filename_failed
, "/", sizeof(filename_failed
));
109 start
= util_strlcat(filename_failed
, ".udev/failed/", sizeof(filename_failed
));
110 util_strlcat(filename_failed
, udev_device_get_devpath(event
->dev
), sizeof(filename_failed
));
111 util_path_encode(&filename_failed
[start
], sizeof(filename_failed
) - start
);
115 if(unlink(filename_failed
) == 0)
116 util_delete_path(event
->udev
, filename_failed
);
117 util_create_path(event
->udev
, filename
);
118 udev_selinux_setfscreatecon(event
->udev
, filename
, S_IFLNK
);
119 symlink(udev_device_get_devpath(event
->dev
), filename
);
120 udev_selinux_resetfscreatecon(event
->udev
);
123 if (udev_device_get_devpath_old(event
->dev
) != NULL
) {
124 /* "move" event - rename failed file to current name, do not delete failed */
125 char filename_failed_old
[UTIL_PATH_SIZE
];
127 util_strlcpy(filename_failed_old
, udev_get_dev_path(event
->udev
), sizeof(filename_failed_old
));
128 util_strlcat(filename_failed_old
, "/", sizeof(filename_failed_old
));
129 start
= util_strlcat(filename_failed_old
, ".udev/failed/", sizeof(filename_failed_old
));
130 util_strlcat(filename_failed_old
, udev_device_get_devpath_old(event
->dev
), sizeof(filename_failed_old
));
131 util_path_encode(&filename_failed_old
[start
], sizeof(filename
) - start
);
133 if (rename(filename_failed_old
, filename_failed
) == 0)
134 info(event
->udev
, "renamed devpath, moved failed state of '%s' to %s'\n",
135 udev_device_get_devpath_old(event
->dev
), udev_device_get_devpath(event
->dev
));
137 if (unlink(filename_failed
) == 0)
138 util_delete_path(event
->udev
, filename_failed
);
143 /* clean up possibly empty queue directory */
144 if (udev_list_is_empty(&event_list
))
145 util_delete_path(event
->udev
, filename
);
148 /* move failed event to the failed directory */
149 util_create_path(event
->udev
, filename_failed
);
150 rename(filename
, filename_failed
);
152 /* clean up possibly empty queue directory */
153 if (udev_list_is_empty(&event_list
))
154 util_delete_path(event
->udev
, filename
);
161 static void event_queue_delete(struct udev_event
*event
)
163 udev_list_node_remove(&event
->node
);
165 /* mark as failed, if "add" event returns non-zero */
166 if (event
->exitstatus
&& strcmp(udev_device_get_action(event
->dev
), "add") == 0)
167 export_event_state(event
, EVENT_FAILED
);
169 export_event_state(event
, EVENT_FINISHED
);
171 udev_device_unref(event
->dev
);
172 udev_event_unref(event
);
175 static void asmlinkage
event_sig_handler(int signum
)
177 if (signum
== SIGALRM
)
181 static void event_fork(struct udev_event
*event
)
184 struct sigaction act
;
189 fprintf(stderr
, "fork %s (%llu)\n",
190 udev_device_get_syspath(event
->dev
),
191 udev_device_get_seqnum(event
->dev
));
198 udev_monitor_unref(kernel_monitor
);
199 udev_ctrl_unref(udev_ctrl
);
201 logging_init("udevd-event");
202 setpriority(PRIO_PROCESS
, 0, UDEV_PRIORITY
);
204 /* set signal handlers */
205 memset(&act
, 0x00, sizeof(act
));
206 act
.sa_handler
= (void (*)(int)) event_sig_handler
;
207 sigemptyset (&act
.sa_mask
);
209 sigaction(SIGALRM
, &act
, NULL
);
211 /* reset to default */
212 act
.sa_handler
= SIG_DFL
;
213 sigaction(SIGINT
, &act
, NULL
);
214 sigaction(SIGTERM
, &act
, NULL
);
215 sigaction(SIGCHLD
, &act
, NULL
);
216 sigaction(SIGHUP
, &act
, NULL
);
218 /* set timeout to prevent hanging processes */
219 alarm(UDEV_EVENT_TIMEOUT
);
221 /* apply rules, create node, symlinks */
222 err
= udev_event_execute_rules(event
, rules
);
224 /* rules may change/disable the timeout */
225 if (udev_device_get_event_timeout(event
->dev
) >= 0)
226 alarm(udev_device_get_event_timeout(event
->dev
));
229 if (err
== 0 && !event
->ignore_device
&& udev_get_run(event
->udev
))
230 udev_event_execute_run(event
);
232 /* apply/restore inotify watch */
233 if (err
== 0 && event
->inotify_watch
) {
234 udev_watch_begin(event
->udev
, event
->dev
);
235 udev_device_update_db(event
->dev
);
238 info(event
->udev
, "seq %llu exit with %i\n", udev_device_get_seqnum(event
->dev
), err
);
244 err(event
->udev
, "fork of child failed: %m\n");
245 event_queue_delete(event
);
248 /* get SIGCHLD in main loop */
249 info(event
->udev
, "seq %llu forked, pid [%d], '%s' '%s', %ld seconds old\n",
250 udev_device_get_seqnum(event
->dev
),
252 udev_device_get_action(event
->dev
),
253 udev_device_get_subsystem(event
->dev
),
254 time(NULL
) - event
->queue_time
);
260 static void event_queue_insert(struct udev_event
*event
)
262 char filename
[UTIL_PATH_SIZE
];
265 event
->queue_time
= time(NULL
);
267 export_event_state(event
, EVENT_QUEUED
);
268 info(event
->udev
, "seq %llu queued, '%s' '%s'\n", udev_device_get_seqnum(event
->dev
),
269 udev_device_get_action(event
->dev
), udev_device_get_subsystem(event
->dev
));
271 util_strlcpy(filename
, udev_get_dev_path(event
->udev
), sizeof(filename
));
272 util_strlcat(filename
, "/.udev/uevent_seqnum", sizeof(filename
));
273 fd
= open(filename
, O_WRONLY
|O_TRUNC
|O_CREAT
, 0644);
278 len
= sprintf(str
, "%llu\n", udev_device_get_seqnum(event
->dev
));
284 udev_list_node_append(&event
->node
, &event_list
);
287 /* run all events with a timeout set immediately */
288 if (udev_device_get_timeout(event
->dev
) > 0) {
294 static int mem_size_mb(void)
298 long int memsize
= -1;
300 f
= fopen("/proc/meminfo", "r");
304 while (fgets(buf
, sizeof(buf
), f
) != NULL
) {
307 if (sscanf(buf
, "MemTotal: %ld kB", &value
) == 1) {
308 memsize
= value
/ 1024;
317 static int compare_devpath(const char *running
, const char *waiting
)
321 while (running
[i
] != '\0' && running
[i
] == waiting
[i
])
324 /* identical device event found */
325 if (running
[i
] == '\0' && waiting
[i
] == '\0')
328 /* parent device event found */
329 if (running
[i
] == '\0' && waiting
[i
] == '/')
332 /* child device event found */
333 if (running
[i
] == '/' && waiting
[i
] == '\0')
336 /* no matching event */
340 /* lookup event for identical, parent, child, or physical device */
341 static int devpath_busy(struct udev_event
*event
)
343 struct udev_list_node
*loop
;
345 if (event
->delaying_seqnum
> 0) {
347 /* check if queue contains events we depend on */
348 udev_list_node_foreach(loop
, &event_list
) {
349 struct udev_event
*loop_event
= node_to_event(loop
);
351 /* we already found a later event, earlier can not block us, no need to check again */
352 if (udev_device_get_seqnum(loop_event
->dev
) < event
->delaying_seqnum
)
355 /* event we checked earlier still exists, no need to check again */
356 if (udev_device_get_seqnum(loop_event
->dev
) == event
->delaying_seqnum
)
359 /* found ourself, no later event can block us */
360 if (udev_device_get_seqnum(loop_event
->dev
) >= udev_device_get_seqnum(event
->dev
))
363 /* check our old name */
364 if (udev_device_get_devpath_old(event
->dev
) != NULL
)
365 if (strcmp(udev_device_get_devpath(loop_event
->dev
), udev_device_get_devpath_old(event
->dev
)) == 0) {
366 event
->delaying_seqnum
= udev_device_get_seqnum(loop_event
->dev
);
370 /* check identical, parent, or child device event */
371 if (compare_devpath(udev_device_get_devpath(loop_event
->dev
), udev_device_get_devpath(event
->dev
)) != 0) {
372 dbg(event
->udev
, "%llu, device event still pending %llu (%s)\n",
373 udev_device_get_seqnum(event
->dev
),
374 udev_device_get_seqnum(loop_event
->dev
),
375 udev_device_get_devpath(loop_event
->dev
));
376 event
->delaying_seqnum
= udev_device_get_seqnum(loop_event
->dev
);
380 /* check for our major:minor number */
381 if (major(udev_device_get_devnum(event
->dev
)) > 0 &&
382 udev_device_get_devnum(loop_event
->dev
) == udev_device_get_devnum(event
->dev
) &&
383 strcmp(udev_device_get_subsystem(event
->dev
), udev_device_get_subsystem(loop_event
->dev
)) == 0) {
384 dbg(event
->udev
, "%llu, device event still pending %llu (%d:%d)\n",
385 udev_device_get_seqnum(event
->dev
),
386 udev_device_get_seqnum(loop_event
->dev
),
387 major(udev_device_get_devnum(loop_event
->dev
)), minor(udev_device_get_devnum(loop_event
->dev
)));
388 event
->delaying_seqnum
= udev_device_get_seqnum(loop_event
->dev
);
392 /* check physical device event (special case of parent) */
393 if (udev_device_get_physdevpath(event
->dev
) != NULL
&&
394 strcmp(udev_device_get_action(event
->dev
), "add") == 0)
395 if (compare_devpath(udev_device_get_devpath(loop_event
->dev
),
396 udev_device_get_physdevpath(event
->dev
)) != 0) {
397 dbg(event
->udev
, "%llu, physical device event still pending %llu (%s)\n",
398 udev_device_get_seqnum(event
->dev
),
399 udev_device_get_seqnum(loop_event
->dev
),
400 udev_device_get_devpath(loop_event
->dev
));
401 event
->delaying_seqnum
= udev_device_get_seqnum(loop_event
->dev
);
408 /* serializes events for the identical and parent and child devices */
409 static void event_queue_manager(struct udev
*udev
)
411 struct udev_list_node
*loop
;
412 struct udev_list_node
*tmp
;
415 if (udev_list_is_empty(&event_list
)) {
417 err(udev
, "event list empty, but childs count is %i", childs
);
423 udev_list_node_foreach_safe(loop
, tmp
, &event_list
) {
424 struct udev_event
*loop_event
= node_to_event(loop
);
426 if (childs
>= max_childs
) {
427 info(udev
, "maximum number (%i) of childs reached\n", childs
);
431 if (loop_event
->pid
!= 0)
434 /* do not start event if parent or child event is still running */
435 if (devpath_busy(loop_event
) != 0) {
436 dbg(udev
, "delay seq %llu (%s)\n",
437 udev_device_get_seqnum(loop_event
->dev
),
438 udev_device_get_devpath(loop_event
->dev
));
442 event_fork(loop_event
);
443 dbg(udev
, "moved seq %llu to running list\n", udev_device_get_seqnum(loop_event
->dev
));
445 /* retry if events finished in the meantime */
446 if (sigchilds_waiting
) {
447 sigchilds_waiting
= 0;
454 /* receive the udevd message from userspace */
455 static void handle_ctrl_msg(struct udev_ctrl
*uctrl
)
457 struct udev
*udev
= udev_ctrl_get_udev(uctrl
);
458 struct udev_ctrl_msg
*ctrl_msg
;
462 ctrl_msg
= udev_ctrl_receive_msg(uctrl
);
463 if (ctrl_msg
== NULL
)
466 i
= udev_ctrl_get_set_log_level(ctrl_msg
);
468 info(udev
, "udevd message (SET_LOG_PRIORITY) received, log_priority=%i\n", i
);
469 udev_set_log_priority(udev
, i
);
472 if (udev_ctrl_get_stop_exec_queue(ctrl_msg
) > 0) {
473 info(udev
, "udevd message (STOP_EXEC_QUEUE) received\n");
477 if (udev_ctrl_get_start_exec_queue(ctrl_msg
) > 0) {
478 info(udev
, "udevd message (START_EXEC_QUEUE) received\n");
480 event_queue_manager(udev
);
483 if (udev_ctrl_get_reload_rules(ctrl_msg
) > 0) {
484 info(udev
, "udevd message (RELOAD_RULES) received\n");
488 str
= udev_ctrl_get_set_env(ctrl_msg
);
496 val
= strchr(key
, '=');
500 if (val
[0] == '\0') {
501 info(udev
, "udevd message (ENV) received, unset '%s'\n", key
);
502 udev_add_property(udev
, key
, NULL
);
504 info(udev
, "udevd message (ENV) received, set '%s=%s'\n", key
, val
);
505 udev_add_property(udev
, key
, val
);
508 err(udev
, "wrong key format '%s'\n", key
);
514 i
= udev_ctrl_get_set_max_childs(ctrl_msg
);
516 info(udev
, "udevd message (SET_MAX_CHILDS) received, max_childs=%i\n", i
);
520 settle_pid
= udev_ctrl_get_settle(ctrl_msg
);
521 if (settle_pid
> 0) {
522 info(udev
, "udevd message (SETTLE) received\n");
524 udev_ctrl_msg_unref(ctrl_msg
);
527 /* read inotify messages */
528 static int handle_inotify(struct udev
*udev
)
532 struct inotify_event
*ev
;
534 if ((ioctl(inotify_fd
, FIONREAD
, &nbytes
) < 0) || (nbytes
<= 0))
537 buf
= malloc(nbytes
);
539 err(udev
, "error getting buffer for inotify, disable watching\n");
545 read(inotify_fd
, buf
, nbytes
);
547 for (pos
= 0; pos
< nbytes
; pos
+= sizeof(struct inotify_event
) + ev
->len
) {
548 struct udev_device
*dev
;
550 ev
= (struct inotify_event
*)(buf
+ pos
);
552 dbg(udev
, "inotify event: %x for %s\n", ev
->mask
, ev
->name
);
557 dev
= udev_watch_lookup(udev
, ev
->wd
);
559 dbg(udev
, "inotify event: %x for %s\n", ev
->mask
, udev_device_get_devnode(dev
));
560 if (ev
->mask
& IN_CLOSE_WRITE
) {
561 char filename
[UTIL_PATH_SIZE
];
564 info(udev
, "device %s closed, synthesising 'change'\n", udev_device_get_devnode(dev
));
565 util_strlcpy(filename
, udev_device_get_syspath(dev
), sizeof(filename
));
566 util_strlcat(filename
, "/uevent", sizeof(filename
));
567 fd
= open(filename
, O_WRONLY
);
568 if (fd
< 0 || write(fd
, "change", 6) < 0)
569 info(udev
, "error writing uevent: %m\n");
572 if (ev
->mask
& IN_IGNORED
)
573 udev_watch_end(udev
, dev
);
575 udev_device_unref(dev
);
584 static void asmlinkage
sig_handler(int signum
)
592 /* set flag, then write to pipe if needed */
593 sigchilds_waiting
= 1;
603 static void udev_done(int pid
, int exitstatus
)
605 struct udev_list_node
*loop
;
607 /* find event associated with pid and delete it */
608 udev_list_node_foreach(loop
, &event_list
) {
609 struct udev_event
*loop_event
= node_to_event(loop
);
611 if (loop_event
->pid
== pid
) {
612 info(loop_event
->udev
, "seq %llu cleanup, pid [%d], status %i, %ld seconds old\n",
613 udev_device_get_seqnum(loop_event
->dev
), loop_event
->pid
,
614 exitstatus
, time(NULL
) - loop_event
->queue_time
);
615 loop_event
->exitstatus
= exitstatus
;
617 fprintf(stderr
, "exit %s (%llu)\n",
618 udev_device_get_syspath(loop_event
->dev
),
619 udev_device_get_seqnum(loop_event
->dev
));
620 event_queue_delete(loop_event
);
623 /* there may be dependent events waiting */
630 static void reap_sigchilds(void)
636 pid
= waitpid(-1, &status
, WNOHANG
);
639 if (WIFEXITED(status
))
640 status
= WEXITSTATUS(status
);
641 else if (WIFSIGNALED(status
))
642 status
= WTERMSIG(status
) + 128;
645 udev_done(pid
, status
);
649 static void cleanup_queue_dir(struct udev
*udev
)
651 char dirname
[UTIL_PATH_SIZE
];
652 char filename
[UTIL_PATH_SIZE
];
655 util_strlcpy(filename
, udev_get_dev_path(udev
), sizeof(filename
));
656 util_strlcat(filename
, "/.udev/uevent_seqnum", sizeof(filename
));
659 util_strlcpy(dirname
, udev_get_dev_path(udev
), sizeof(dirname
));
660 util_strlcat(dirname
, "/.udev/queue", sizeof(dirname
));
661 dir
= opendir(dirname
);
667 if (dent
== NULL
|| dent
->d_name
[0] == '\0')
669 if (dent
->d_name
[0] == '.')
671 util_strlcpy(filename
, dirname
, sizeof(filename
));
672 util_strlcat(filename
, "/", sizeof(filename
));
673 util_strlcat(filename
, dent
->d_name
, sizeof(filename
));
681 static void export_initial_seqnum(struct udev
*udev
)
683 char filename
[UTIL_PATH_SIZE
];
688 util_strlcpy(filename
, udev_get_sys_path(udev
), sizeof(filename
));
689 util_strlcat(filename
, "/kernel/uevent_seqnum", sizeof(filename
));
690 fd
= open(filename
, O_RDONLY
);
692 len
= read(fd
, seqnum
, sizeof(seqnum
)-1);
696 strcpy(seqnum
, "0\n");
699 util_strlcpy(filename
, udev_get_dev_path(udev
), sizeof(filename
));
700 util_strlcat(filename
, "/.udev/uevent_seqnum", sizeof(filename
));
701 util_create_path(udev
, filename
);
702 fd
= open(filename
, O_WRONLY
|O_TRUNC
|O_CREAT
, 0644);
704 write(fd
, seqnum
, len
);
709 int main(int argc
, char *argv
[])
713 struct sigaction act
;
716 int resolve_names
= 1;
717 static const struct option options
[] = {
718 { "daemon", no_argument
, NULL
, 'd' },
719 { "debug-trace", no_argument
, NULL
, 't' },
720 { "debug", no_argument
, NULL
, 'D' },
721 { "help", no_argument
, NULL
, 'h' },
722 { "version", no_argument
, NULL
, 'V' },
723 { "resolve-names", required_argument
, NULL
, 'N' },
732 logging_init("udevd");
733 udev_set_log_fn(udev
, log_fn
);
734 info(udev
, "version %s\n", VERSION
);
735 udev_selinux_init(udev
);
740 option
= getopt_long(argc
, argv
, "dDthV", options
, NULL
);
753 if (udev_get_log_priority(udev
) < LOG_INFO
)
754 udev_set_log_priority(udev
, LOG_INFO
);
757 if (strcmp (optarg
, "early") == 0) {
759 } else if (strcmp (optarg
, "late") == 0) {
761 } else if (strcmp (optarg
, "never") == 0) {
764 fprintf(stderr
, "resolve-names must be early, late or never\n");
765 err(udev
, "resolve-names must be early, late or never\n");
770 printf("Usage: udevd [--help] [--daemon] [--debug-trace] [--debug] "
771 "[--resolve-names=early|late|never] [--version]\n");
774 printf("%s\n", VERSION
);
782 fprintf(stderr
, "root privileges required\n");
783 err(udev
, "root privileges required\n");
787 /* make sure std{in,out,err} fd's are in a sane state */
788 fd
= open("/dev/null", O_RDWR
);
790 fprintf(stderr
, "cannot open /dev/null\n");
791 err(udev
, "cannot open /dev/null\n");
793 if (write(STDOUT_FILENO
, 0, 0) < 0)
794 dup2(fd
, STDOUT_FILENO
);
795 if (write(STDERR_FILENO
, 0, 0) < 0)
796 dup2(fd
, STDERR_FILENO
);
798 /* init control socket, bind() ensures, that only one udevd instance is running */
799 udev_ctrl
= udev_ctrl_new_from_socket(udev
, UDEV_CTRL_SOCK_PATH
);
800 if (udev_ctrl
== NULL
) {
801 fprintf(stderr
, "error initializing control socket");
802 err(udev
, "error initializing udevd socket");
807 if (udev_ctrl_enable_receiving(udev_ctrl
) < 0) {
808 fprintf(stderr
, "error binding control socket, seems udevd is already running\n");
809 err(udev
, "error binding control socket, seems udevd is already running\n");
814 kernel_monitor
= udev_monitor_new_from_netlink(udev
);
815 if (kernel_monitor
== NULL
|| udev_monitor_enable_receiving(kernel_monitor
) < 0) {
816 fprintf(stderr
, "error initializing netlink socket\n");
817 err(udev
, "error initializing netlink socket\n");
821 udev_monitor_set_receive_buffer_size(kernel_monitor
, 128*1024*1024);
823 rules
= udev_rules_new(udev
, resolve_names
);
825 err(udev
, "error reading rules\n");
828 udev_list_init(&event_list
);
829 cleanup_queue_dir(udev
);
830 export_initial_seqnum(udev
);
838 dbg(udev
, "daemonized fork running\n");
841 err(udev
, "fork of daemon failed: %m\n");
845 dbg(udev
, "child [%u] running, parent exits\n", pid
);
851 /* redirect std{out,err} */
852 if (!debug
&& !debug_trace
) {
853 dup2(fd
, STDIN_FILENO
);
854 dup2(fd
, STDOUT_FILENO
);
855 dup2(fd
, STDERR_FILENO
);
857 if (fd
> STDERR_FILENO
)
860 /* set scheduling priority for the daemon */
861 setpriority(PRIO_PROCESS
, 0, UDEVD_PRIORITY
);
867 /* OOM_DISABLE == -17 */
868 fd
= open("/proc/self/oom_adj", O_RDWR
);
870 err(udev
, "error disabling OOM: %m\n");
876 fd
= open("/dev/kmsg", O_WRONLY
);
878 const char *ver_str
= "<6>udev: starting version " VERSION
"\n";
879 char path
[UTIL_PATH_SIZE
];
882 write(fd
, ver_str
, strlen(ver_str
));
883 util_strlcpy(path
, udev_get_sys_path(udev
), sizeof(path
));
884 util_strlcat(path
, "/class/mem/null", sizeof(path
));
885 if (lstat(path
, &statbuf
) == 0) {
886 if (S_ISDIR(statbuf
.st_mode
)) {
887 const char *depr_str
=
888 "<6>udev: deprecated sysfs layout; update the kernel or "
889 "disable CONFIG_SYSFS_DEPRECATED; some udev features will "
890 "not work correctly\n";
892 write(fd
, depr_str
, strlen(depr_str
));
898 /* set signal handlers */
899 memset(&act
, 0x00, sizeof(struct sigaction
));
900 act
.sa_handler
= (void (*)(int)) sig_handler
;
901 sigemptyset(&act
.sa_mask
);
902 act
.sa_flags
= SA_RESTART
;
903 sigaction(SIGINT
, &act
, NULL
);
904 sigaction(SIGTERM
, &act
, NULL
);
905 sigaction(SIGCHLD
, &act
, NULL
);
906 sigaction(SIGHUP
, &act
, NULL
);
908 /* watch rules directory */
909 udev_watch_init(udev
);
910 if (inotify_fd
>= 0) {
911 if (udev_get_rules_path(udev
) != NULL
) {
912 inotify_add_watch(inotify_fd
, udev_get_rules_path(udev
),
913 IN_CREATE
| IN_DELETE
| IN_MOVE
| IN_CLOSE_WRITE
);
915 char filename
[UTIL_PATH_SIZE
];
917 inotify_add_watch(inotify_fd
, UDEV_PREFIX
"/lib/udev/rules.d",
918 IN_CREATE
| IN_DELETE
| IN_MOVE
| IN_CLOSE_WRITE
);
919 inotify_add_watch(inotify_fd
, SYSCONFDIR
"/udev/rules.d",
920 IN_CREATE
| IN_DELETE
| IN_MOVE
| IN_CLOSE_WRITE
);
922 /* watch dynamic rules directory */
923 util_strlcpy(filename
, udev_get_dev_path(udev
), sizeof(filename
));
924 util_strlcat(filename
, "/.udev/rules.d", sizeof(filename
));
925 inotify_add_watch(inotify_fd
, filename
,
926 IN_CREATE
| IN_DELETE
| IN_MOVE
| IN_CLOSE_WRITE
);
929 udev_watch_restore(udev
);
932 /* in trace mode run one event after the other */
936 int memsize
= mem_size_mb();
938 max_childs
= 128 + (memsize
/ 4);
940 max_childs
= UDEVD_MAX_CHILDS
;
942 /* possibly overwrite maximum limit of executed events */
943 value
= getenv("UDEVD_MAX_CHILDS");
945 max_childs
= strtoul(value
, NULL
, 10);
946 info(udev
, "initialize max_childs to %u\n", max_childs
);
949 sigset_t blocked_mask
, orig_mask
;
950 struct pollfd pfd
[4];
951 struct pollfd
*ctrl_poll
, *monitor_poll
, *inotify_poll
= NULL
;
955 sigfillset(&blocked_mask
);
956 sigprocmask(SIG_SETMASK
, &blocked_mask
, &orig_mask
);
957 if (signal_received
) {
958 sigprocmask(SIG_SETMASK
, &orig_mask
, NULL
);
962 ctrl_poll
= &pfd
[nfds
++];
963 ctrl_poll
->fd
= udev_ctrl_get_fd(udev_ctrl
);
964 ctrl_poll
->events
= POLLIN
;
966 monitor_poll
= &pfd
[nfds
++];
967 monitor_poll
->fd
= udev_monitor_get_fd(kernel_monitor
);
968 monitor_poll
->events
= POLLIN
;
970 if (inotify_fd
>= 0) {
971 inotify_poll
= &pfd
[nfds
++];
972 inotify_poll
->fd
= inotify_fd
;
973 inotify_poll
->events
= POLLIN
;
976 fdcount
= ppoll(pfd
, nfds
, NULL
, &orig_mask
);
977 sigprocmask(SIG_SETMASK
, &orig_mask
, NULL
);
981 err(udev
, "error in select: %m\n");
985 /* get control message */
986 if (ctrl_poll
->revents
& POLLIN
)
987 handle_ctrl_msg(udev_ctrl
);
989 /* get kernel uevent */
990 if (monitor_poll
->revents
& POLLIN
) {
991 struct udev_device
*dev
;
993 dev
= udev_monitor_receive_device(kernel_monitor
);
995 struct udev_event
*event
;
997 event
= udev_event_new(dev
);
999 event_queue_insert(event
);
1001 udev_device_unref(dev
);
1005 /* rules directory inotify watch */
1006 if (inotify_poll
&& (inotify_poll
->revents
& POLLIN
))
1007 handle_inotify(udev
);
1010 signal_received
= 0;
1012 /* rules changed, set by inotify or a HUP signal */
1013 if (reload_config
) {
1014 struct udev_rules
*rules_new
;
1017 rules_new
= udev_rules_new(udev
, resolve_names
);
1018 if (rules_new
!= NULL
) {
1019 udev_rules_unref(rules
);
1024 if (sigchilds_waiting
) {
1025 sigchilds_waiting
= 0;
1032 event_queue_manager(udev
);
1035 if (settle_pid
> 0) {
1036 kill(settle_pid
, SIGUSR1
);
1040 cleanup_queue_dir(udev
);
1043 udev_rules_unref(rules
);
1044 udev_ctrl_unref(udev_ctrl
);
1045 if (inotify_fd
>= 0)
1047 udev_monitor_unref(kernel_monitor
);
1048 udev_selinux_exit(udev
);