2 * udevd.c - event listener and serializer
4 * Copyright (C) 2004-2005 Kay Sievers <kay.sievers@vrfy.org>
5 * Copyright (C) 2004 Chris Friesen <chris_friesen@sympatico.ca>
8 * This program is free software; you can redistribute it and/or modify it
9 * under the terms of the GNU General Public License as published by the
10 * Free Software Foundation version 2 of the License.
12 * This program is distributed in the hope that it will be useful, but
13 * WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * General Public License for more details.
17 * You should have received a copy of the GNU General Public License along
18 * with this program; if not, write to the Free Software Foundation, Inc.,
19 * 675 Mass Ave, Cambridge, MA 02139, USA.
35 #include <sys/select.h>
37 #include <sys/types.h>
38 #include <sys/socket.h>
41 #include <sys/ioctl.h>
42 #include <linux/types.h>
43 #include <linux/netlink.h>
46 #include "udev_rules.h"
49 static struct udev_rules rules;
50 static int udevd_sock;
51 static int uevent_netlink_sock;
52 static int inotify_fd;
55 static int signal_pipe[2] = {-1, -1};
56 static volatile int sigchilds_waiting;
57 static volatile int udev_exit;
58 static volatile int reload_config;
59 static int run_exec_q;
60 static int stop_exec_q;
61 static int max_childs;
62 static int max_childs_running;
63 static char udev_log[32];
65 static LIST_HEAD(exec_list);
66 static LIST_HEAD(running_list);
70 void log_message(int priority, const char *format, ...)
74 if (priority > udev_log_priority)
77 va_start(args, format);
78 vsyslog(priority, format, args);
83 static void asmlinkage udev_event_sig_handler(int signum)
85 if (signum == SIGALRM)
89 static int udev_event_process(struct uevent_msg *msg)
96 /* set signal handlers */
97 memset(&act, 0x00, sizeof(act));
98 act.sa_handler = (void (*)(int)) udev_event_sig_handler;
99 sigemptyset (&act.sa_mask);
101 sigaction(SIGALRM, &act, NULL);
103 /* reset to default */
104 act.sa_handler = SIG_DFL;
105 sigaction(SIGINT, &act, NULL);
106 sigaction(SIGTERM, &act, NULL);
107 sigaction(SIGCHLD, &act, NULL);
108 sigaction(SIGHUP, &act, NULL);
110 /* trigger timeout to prevent hanging processes */
111 alarm(UDEV_ALARM_TIMEOUT);
113 /* reconstruct event environment from message */
114 for (i = 0; msg->envp[i]; i++)
115 putenv(msg->envp[i]);
117 udev = udev_device_init();
120 strlcpy(udev->action, msg->action, sizeof(udev->action));
121 sysfs_device_set_values(udev->dev, msg->devpath, msg->subsystem);
122 udev->devt = msg->devt;
124 retval = udev_device_event(&rules, udev);
126 /* run programs collected by RUN-key*/
127 if (retval == 0 && !udev->ignore_device && udev_run) {
128 struct name_entry *name_loop;
130 dbg("executing run list");
131 list_for_each_entry(name_loop, &udev->run_list, node) {
132 if (strncmp(name_loop->name, "socket:", strlen("socket:")) == 0)
133 pass_env_to_socket(&name_loop->name[strlen("socket:")], msg->devpath, msg->action);
135 char program[PATH_SIZE];
137 strlcpy(program, name_loop->name, sizeof(program));
138 udev_rules_apply_format(udev, program, sizeof(program));
139 if (run_program(program, udev->dev->subsystem, NULL, 0, NULL,
140 (udev_log_priority >= LOG_INFO)))
146 udev_device_cleanup(udev);
156 static void export_event_state(struct uevent_msg *msg, enum event_state state)
158 char filename[PATH_SIZE];
159 char filename_failed[PATH_SIZE];
160 char target[PATH_SIZE];
161 size_t start, end, i;
162 struct uevent_msg *loop_msg;
164 /* add location of queue files */
165 strlcpy(filename, udev_root, sizeof(filename));
166 strlcat(filename, "/", sizeof(filename));
167 start = strlcat(filename, EVENT_QUEUE_DIR, sizeof(filename));
168 end = strlcat(filename, msg->devpath, sizeof(filename));
169 if (end > sizeof(filename))
170 end = sizeof(filename);
172 /* replace '/' to transform path into a filename */
173 for (i = start+1; i < end; i++)
174 if (filename[i] == '/')
175 filename[i] = PATH_TO_NAME_CHAR;
177 /* add location of failed files */
178 strlcpy(filename_failed, udev_root, sizeof(filename_failed));
179 strlcat(filename_failed, "/", sizeof(filename_failed));
180 start = strlcat(filename_failed, EVENT_FAILED_DIR, sizeof(filename_failed));
181 end = strlcat(filename_failed, msg->devpath, sizeof(filename_failed));
182 if (end > sizeof(filename_failed))
183 end = sizeof(filename_failed);
185 /* replace '/' to transform path into a filename */
186 for (i = start+1; i < end; i++)
187 if (filename_failed[i] == '/')
188 filename_failed[i] = PATH_TO_NAME_CHAR;
192 unlink(filename_failed);
193 delete_path(filename_failed);
195 strlcpy(target, sysfs_path, sizeof(target));
196 strlcat(target, msg->devpath, sizeof(target));
197 create_path(filename);
198 symlink(target, filename);
202 unlink(filename_failed);
203 delete_path(filename_failed);
205 /* don't remove, if events for the same path are still pending */
206 list_for_each_entry(loop_msg, &running_list, node)
207 if (loop_msg->devpath && strcmp(loop_msg->devpath, msg->devpath) == 0)
210 list_for_each_entry(loop_msg, &exec_list, node)
211 if (loop_msg->devpath && strcmp(loop_msg->devpath, msg->devpath) == 0)
214 /* move failed events to the failed directory */
215 if (state == EVENT_FAILED) {
216 create_path(filename_failed);
217 rename(filename, filename_failed);
222 /* clean up the queue directory */
223 delete_path(filename);
229 static void msg_queue_delete(struct uevent_msg *msg)
231 list_del(&msg->node);
233 /* mark as failed, if add event returns non-zero */
234 if (msg->exitstatus && strcmp(msg->action, "add") == 0)
235 export_event_state(msg, EVENT_FAILED);
237 export_event_state(msg, EVENT_FINISHED);
242 static void udev_event_run(struct uevent_msg *msg)
251 close(uevent_netlink_sock);
255 close(signal_pipe[READ_END]);
256 close(signal_pipe[WRITE_END]);
259 logging_init("udevd-event");
260 setpriority(PRIO_PROCESS, 0, UDEV_PRIORITY);
261 retval = udev_event_process(msg);
262 info("seq %llu finished", msg->seqnum);
269 err("fork of child failed: %s", strerror(errno));
270 msg_queue_delete(msg);
273 /* get SIGCHLD in main loop */
274 info("seq %llu forked, pid [%d], '%s' '%s', %ld seconds old",
275 msg->seqnum, pid, msg->action, msg->subsystem, time(NULL) - msg->queue_time);
280 static void msg_queue_insert(struct uevent_msg *msg)
282 msg->queue_time = time(NULL);
284 export_event_state(msg, EVENT_QUEUED);
286 /* run all events with a timeout set immediately */
287 if (msg->timeout != 0) {
288 list_add_tail(&msg->node, &running_list);
293 list_add_tail(&msg->node, &exec_list);
297 /* runs event and removes event from run queue when finished */
298 static int running_processes(void)
301 static char buf[4096];
306 f = open("/proc/stat", O_RDONLY);
310 len = read(f, buf, sizeof(buf)-1);
318 pos = strstr(buf, "procs_running ");
322 if (sscanf(pos, "procs_running %u", &running) != 1)
328 /* return the number of process es in our session, count only until limit */
329 static int running_processes_in_session(pid_t session, int limit)
335 dir = opendir("/proc");
339 /* read process info from /proc */
340 for (dent = readdir(dir); dent != NULL; dent = readdir(dir)) {
346 pid_t ppid, pgrp, sess;
349 if (!isdigit(dent->d_name[0]))
352 snprintf(procdir, sizeof(procdir), "/proc/%s/stat", dent->d_name);
353 procdir[sizeof(procdir)-1] = '\0';
355 f = open(procdir, O_RDONLY);
359 len = read(f, line, sizeof(line)-1);
367 /* skip ugly program name */
368 pos = strrchr(line, ')') + 2;
372 if (sscanf(pos, "%c %d %d %d ", &state, &ppid, &pgrp, &sess) != 4)
375 /* count only processes in our session */
379 /* count only running, no sleeping processes */
384 if (limit > 0 && running >= limit)
392 static int compare_devpath(const char *running, const char *waiting)
396 for (i = 0; i < PATH_SIZE; i++) {
397 /* identical device event found */
398 if (running[i] == '\0' && waiting[i] == '\0')
401 /* parent device event found */
402 if (running[i] == '\0' && waiting[i] == '/')
405 /* child device event found */
406 if (running[i] == '/' && waiting[i] == '\0')
409 /* no matching event */
410 if (running[i] != waiting[i])
417 /* returns still running task for the same device, its parent or its physical device */
418 static int running_with_devpath(struct uevent_msg *msg, int limit)
420 struct uevent_msg *loop_msg;
421 int childs_count = 0;
423 list_for_each_entry(loop_msg, &running_list, node) {
424 if (limit && childs_count++ > limit) {
425 dbg("%llu, maximum number (%i) of child reached", msg->seqnum, childs_count);
429 /* return running parent/child device event */
430 if (compare_devpath(loop_msg->devpath, msg->devpath) != 0) {
431 dbg("%llu, child device event still running %llu (%s)",
432 msg->seqnum, loop_msg->seqnum, loop_msg->devpath);
436 /* return running physical device event */
437 if (msg->physdevpath && msg->action && strcmp(msg->action, "add") == 0)
438 if (compare_devpath(loop_msg->devpath, msg->physdevpath) != 0) {
439 dbg("%llu, physical device event still running %llu (%s)",
440 msg->seqnum, loop_msg->seqnum, loop_msg->devpath);
448 /* exec queue management routine executes the events and serializes events in the same sequence */
449 static void msg_queue_manager(void)
451 struct uevent_msg *loop_msg;
452 struct uevent_msg *tmp_msg;
455 if (list_empty(&exec_list))
458 running = running_processes();
459 dbg("%d processes runnning on system", running);
461 running = max_childs_running;
463 list_for_each_entry_safe(loop_msg, tmp_msg, &exec_list, node) {
464 /* check running processes in our session and possibly throttle */
465 if (running >= max_childs_running) {
466 running = running_processes_in_session(sid, max_childs_running+10);
467 dbg("at least %d processes running in session", running);
468 if (running >= max_childs_running) {
469 dbg("delay seq %llu, too many processes already running", loop_msg->seqnum);
474 /* don't run two processes for the same devpath and wait for the parent*/
475 if (running_with_devpath(loop_msg, max_childs)) {
476 dbg("delay seq %llu (%s)", loop_msg->seqnum, loop_msg->devpath);
480 /* move event to run list */
481 list_move_tail(&loop_msg->node, &running_list);
482 udev_event_run(loop_msg);
484 dbg("moved seq %llu to running list", loop_msg->seqnum);
488 static struct uevent_msg *get_msg_from_envbuf(const char *buf, int buf_size)
492 struct uevent_msg *msg;
496 msg = malloc(sizeof(struct uevent_msg) + buf_size);
499 memset(msg, 0x00, sizeof(struct uevent_msg) + buf_size);
501 /* copy environment buffer and reconstruct envp */
502 memcpy(msg->envbuf, buf, buf_size);
504 for (i = 0; (bufpos < buf_size) && (i < UEVENT_NUM_ENVP-2); i++) {
508 key = &msg->envbuf[bufpos];
509 keylen = strlen(key);
511 bufpos += keylen + 1;
512 dbg("add '%s' to msg.envp[%i]", msg->envp[i], i);
514 /* remember some keys for further processing */
515 if (strncmp(key, "ACTION=", 7) == 0)
516 msg->action = &key[7];
517 else if (strncmp(key, "DEVPATH=", 8) == 0)
518 msg->devpath = &key[8];
519 else if (strncmp(key, "SUBSYSTEM=", 10) == 0)
520 msg->subsystem = &key[10];
521 else if (strncmp(key, "SEQNUM=", 7) == 0)
522 msg->seqnum = strtoull(&key[7], NULL, 10);
523 else if (strncmp(key, "PHYSDEVPATH=", 12) == 0)
524 msg->physdevpath = &key[12];
525 else if (strncmp(key, "MAJOR=", 6) == 0)
526 major = strtoull(&key[6], NULL, 10);
527 else if (strncmp(key, "MINOR=", 6) == 0)
528 minor = strtoull(&key[6], NULL, 10);
529 else if (strncmp(key, "TIMEOUT=", 8) == 0)
530 msg->timeout = strtoull(&key[8], NULL, 10);
532 msg->devt = makedev(major, minor);
533 msg->envp[i++] = "UDEVD_EVENT=1";
536 if (msg->devpath == NULL || msg->action == NULL) {
537 info("DEVPATH or ACTION missing, ignore message");
544 /* receive the udevd message from userspace */
545 static struct uevent_msg *get_udevd_msg(void)
547 static struct udevd_msg usend_msg;
548 struct uevent_msg *msg;
551 struct cmsghdr *cmsg;
554 char cred_msg[CMSG_SPACE(sizeof(struct ucred))];
558 memset(&usend_msg, 0x00, sizeof(struct udevd_msg));
559 iov.iov_base = &usend_msg;
560 iov.iov_len = sizeof(struct udevd_msg);
562 memset(&smsg, 0x00, sizeof(struct msghdr));
565 smsg.msg_control = cred_msg;
566 smsg.msg_controllen = sizeof(cred_msg);
568 size = recvmsg(udevd_sock, &smsg, 0);
571 err("unable to receive user udevd message: %s", strerror(errno));
574 cmsg = CMSG_FIRSTHDR(&smsg);
575 cred = (struct ucred *) CMSG_DATA(cmsg);
577 if (cmsg == NULL || cmsg->cmsg_type != SCM_CREDENTIALS) {
578 err("no sender credentials received, message ignored");
582 if (cred->uid != 0) {
583 err("sender uid=%i, message ignored", cred->uid);
587 if (strncmp(usend_msg.magic, UDEV_MAGIC, sizeof(UDEV_MAGIC)) != 0 ) {
588 err("message magic '%s' doesn't match, ignore it", usend_msg.magic);
592 switch (usend_msg.type) {
593 case UDEVD_UEVENT_UDEVSEND:
594 info("udevd event message received");
595 envbuf_size = size - offsetof(struct udevd_msg, envbuf);
596 dbg("envbuf_size=%i", envbuf_size);
597 msg = get_msg_from_envbuf(usend_msg.envbuf, envbuf_size);
600 msg->type = usend_msg.type;
602 case UDEVD_STOP_EXEC_QUEUE:
603 info("udevd message (STOP_EXEC_QUEUE) received");
606 case UDEVD_START_EXEC_QUEUE:
607 info("udevd message (START_EXEC_QUEUE) received");
611 case UDEVD_SET_LOG_LEVEL:
612 intval = (int *) usend_msg.envbuf;
613 info("udevd message (SET_LOG_PRIORITY) received, udev_log_priority=%i", *intval);
614 udev_log_priority = *intval;
615 sprintf(udev_log, "UDEV_LOG=%i", udev_log_priority);
618 case UDEVD_SET_MAX_CHILDS:
619 intval = (int *) usend_msg.envbuf;
620 info("udevd message (UDEVD_SET_MAX_CHILDS) received, max_childs=%i", *intval);
621 max_childs = *intval;
623 case UDEVD_RELOAD_RULES:
624 info("udevd message (RELOAD_RULES) received");
628 dbg("unknown message type");
633 /* receive the kernel user event message and do some sanity checks */
634 static struct uevent_msg *get_netlink_msg(void)
636 struct uevent_msg *msg;
639 static char buffer[UEVENT_BUFFER_SIZE+512];
642 size = recv(uevent_netlink_sock, &buffer, sizeof(buffer), 0);
645 err("unable to receive kernel netlink message: %s", strerror(errno));
649 if ((size_t)size > sizeof(buffer)-1)
650 size = sizeof(buffer)-1;
652 dbg("uevent_size=%zi", size);
654 /* start of event payload */
655 bufpos = strlen(buffer)+1;
656 msg = get_msg_from_envbuf(&buffer[bufpos], size-bufpos);
659 msg->type = UDEVD_UEVENT_NETLINK;
661 /* validate message */
662 pos = strchr(buffer, '@');
664 err("invalid uevent '%s'", buffer);
670 if (msg->action == NULL) {
671 info("no ACTION in payload found, skip event '%s'", buffer);
676 if (strcmp(msg->action, buffer) != 0) {
677 err("ACTION in payload does not match uevent, skip event '%s'", buffer);
685 static void asmlinkage sig_handler(int signum)
693 /* set flag, then write to pipe if needed */
694 sigchilds_waiting = 1;
701 /* write to pipe, which will wakeup select() in our mainloop */
702 write(signal_pipe[WRITE_END], "", 1);
705 static void udev_done(int pid, int exitstatus)
707 /* find msg associated with pid and delete it */
708 struct uevent_msg *msg;
710 list_for_each_entry(msg, &running_list, node) {
711 if (msg->pid == pid) {
712 info("seq %llu, pid [%d] exit with %i, %ld seconds old", msg->seqnum, msg->pid,
713 exitstatus, time(NULL) - msg->queue_time);
714 msg->exitstatus = exitstatus;
715 msg_queue_delete(msg);
717 /* there may be events waiting with the same devpath */
724 static void reap_sigchilds(void)
730 pid = waitpid(-1, &status, WNOHANG);
733 if (WIFEXITED(status))
734 status = WEXITSTATUS(status);
735 else if (WIFSIGNALED(status))
736 status = WTERMSIG(status) + 128;
739 udev_done(pid, status);
743 static int init_udevd_socket(void)
745 struct sockaddr_un saddr;
746 const int buffersize = 16 * 1024 * 1024;
748 const int feature_on = 1;
751 memset(&saddr, 0x00, sizeof(saddr));
752 saddr.sun_family = AF_LOCAL;
753 /* use abstract namespace for socket path */
754 strcpy(&saddr.sun_path[1], UDEVD_SOCK_PATH);
755 addrlen = offsetof(struct sockaddr_un, sun_path) + strlen(saddr.sun_path+1) + 1;
757 udevd_sock = socket(AF_LOCAL, SOCK_DGRAM, 0);
758 if (udevd_sock == -1) {
759 err("error getting socket: %s", strerror(errno));
763 /* set receive buffersize */
764 setsockopt(udevd_sock, SOL_SOCKET, SO_RCVBUFFORCE, &buffersize, sizeof(buffersize));
766 /* the bind takes care of ensuring only one copy running */
767 retval = bind(udevd_sock, (struct sockaddr *) &saddr, addrlen);
769 err("bind failed: %s", strerror(errno));
773 /* enable receiving of the sender credentials */
774 setsockopt(udevd_sock, SOL_SOCKET, SO_PASSCRED, &feature_on, sizeof(feature_on));
779 static int init_uevent_netlink_sock(void)
781 struct sockaddr_nl snl;
782 const int buffersize = 16 * 1024 * 1024;
785 memset(&snl, 0x00, sizeof(struct sockaddr_nl));
786 snl.nl_family = AF_NETLINK;
787 snl.nl_pid = getpid();
788 snl.nl_groups = 0xffffffff;
790 uevent_netlink_sock = socket(PF_NETLINK, SOCK_DGRAM, NETLINK_KOBJECT_UEVENT);
791 if (uevent_netlink_sock == -1) {
792 err("error getting socket: %s", strerror(errno));
796 /* set receive buffersize */
797 setsockopt(uevent_netlink_sock, SOL_SOCKET, SO_RCVBUFFORCE, &buffersize, sizeof(buffersize));
799 retval = bind(uevent_netlink_sock, (struct sockaddr *) &snl, sizeof(struct sockaddr_nl));
801 err("bind failed: %s", strerror(errno));
802 close(uevent_netlink_sock);
803 uevent_netlink_sock = -1;
809 int main(int argc, char *argv[], char *envp[])
813 struct sigaction act;
821 /* redirect std fd's, if the kernel forks us, we don't have them at all */
822 fd = open("/dev/null", O_RDWR);
824 if (fd != STDIN_FILENO)
825 dup2(fd, STDIN_FILENO);
826 if (fd != STDOUT_FILENO)
827 dup2(fd, STDOUT_FILENO);
828 if (fd != STDERR_FILENO)
829 dup2(fd, STDERR_FILENO);
830 if (fd > STDERR_FILENO)
834 logging_init("udevd");
836 err("fatal, could not open /dev/null: %s", strerror(errno));
839 dbg("version %s", UDEV_VERSION);
842 err("need to be root, exit");
846 /* parse commandline options */
847 for (i = 1 ; i < argc; i++) {
849 if (strcmp(arg, "--daemon") == 0 || strcmp(arg, "-d") == 0) {
850 info("will daemonize");
853 if (strcmp(arg, "--stop-exec-queue") == 0) {
854 info("will not execute events until START_EXEC_QUEUE is received");
859 /* init sockets to receive events */
860 if (init_udevd_socket() < 0) {
861 if (errno == EADDRINUSE) {
862 err("another udevd running, exit");
865 err("error initializing udevd socket: %s", strerror(errno));
871 if (init_uevent_netlink_sock() < 0) {
872 err("uevent socket not available");
877 /* parse the rules and keep it in memory */
879 udev_rules_init(&rules, 1);
887 dbg("daemonized fork running");
890 err("fork of daemon failed: %s", strerror(errno));
894 dbg("child [%u] running, parent exits", pid);
899 /* set scheduling priority for the daemon */
900 setpriority(PRIO_PROCESS, 0, UDEVD_PRIORITY);
905 /* become session leader */
907 dbg("our session is %d", sid);
909 /* OOM_DISABLE == -17 */
910 fd = open("/proc/self/oom_adj", O_RDWR);
912 err("error disabling OOM: %s", strerror(errno));
918 /* setup signal handler pipe */
919 retval = pipe(signal_pipe);
921 err("error getting pipes: %s", strerror(errno));
925 retval = fcntl(signal_pipe[READ_END], F_GETFL, 0);
927 err("error fcntl on read pipe: %s", strerror(errno));
930 retval = fcntl(signal_pipe[READ_END], F_SETFL, retval | O_NONBLOCK);
932 err("error fcntl on read pipe: %s", strerror(errno));
936 retval = fcntl(signal_pipe[WRITE_END], F_GETFL, 0);
938 err("error fcntl on write pipe: %s", strerror(errno));
941 retval = fcntl(signal_pipe[WRITE_END], F_SETFL, retval | O_NONBLOCK);
943 err("error fcntl on write pipe: %s", strerror(errno));
947 /* set signal handlers */
948 memset(&act, 0x00, sizeof(struct sigaction));
949 act.sa_handler = (void (*)(int)) sig_handler;
950 sigemptyset(&act.sa_mask);
951 act.sa_flags = SA_RESTART;
952 sigaction(SIGINT, &act, NULL);
953 sigaction(SIGTERM, &act, NULL);
954 sigaction(SIGCHLD, &act, NULL);
955 sigaction(SIGHUP, &act, NULL);
957 /* watch rules directory */
958 inotify_fd = inotify_init();
960 inotify_add_watch(inotify_fd, udev_rules_filename, IN_CREATE | IN_DELETE | IN_MOVE | IN_CLOSE_WRITE);
962 /* maximum limit of forked childs */
963 value = getenv("UDEVD_MAX_CHILDS");
965 max_childs = strtoul(value, NULL, 10);
967 max_childs = UDEVD_MAX_CHILDS;
968 info("initialize max_childs to %u", max_childs);
970 /* start to throttle forking if maximum number of _running_ childs is reached */
971 value = getenv("UDEVD_MAX_CHILDS_RUNNING");
973 max_childs_running = strtoull(value, NULL, 10);
975 max_childs_running = UDEVD_MAX_CHILDS_RUNNING;
976 info("initialize max_childs_running to %u", max_childs_running);
978 /* clear environment for forked event processes */
981 /* export log_priority , as called programs may want to follow that setting */
982 sprintf(udev_log, "UDEV_LOG=%i", udev_log_priority);
986 maxfd = UDEV_MAX(maxfd, uevent_netlink_sock);
987 maxfd = UDEV_MAX(maxfd, signal_pipe[READ_END]);
988 maxfd = UDEV_MAX(maxfd, inotify_fd);
991 struct uevent_msg *msg;
995 FD_SET(signal_pipe[READ_END], &readfds);
996 FD_SET(udevd_sock, &readfds);
997 FD_SET(uevent_netlink_sock, &readfds);
999 FD_SET(inotify_fd, &readfds);
1001 fdcount = select(maxfd+1, &readfds, NULL, NULL, NULL);
1004 err("error in select: %s", strerror(errno));
1008 /* get user socket message */
1009 if (FD_ISSET(udevd_sock, &readfds)) {
1010 msg = get_udevd_msg();
1012 msg_queue_insert(msg);
1015 /* get kernel netlink message */
1016 if (FD_ISSET(uevent_netlink_sock, &readfds)) {
1017 msg = get_netlink_msg();
1019 msg_queue_insert(msg);
1022 /* received a signal, clear our notification pipe */
1023 if (FD_ISSET(signal_pipe[READ_END], &readfds)) {
1026 read(signal_pipe[READ_END], &buf, sizeof(buf));
1029 /* rules directory inotify watch */
1030 if ((inotify_fd > 0) && FD_ISSET(inotify_fd, &readfds)) {
1033 /* discard all possible events, we can just reload the config */
1034 if ((ioctl(inotify_fd, FIONREAD, &nbytes) == 0) && nbytes) {
1038 buf = malloc(nbytes);
1040 err("error getting buffer for inotify, disable watching");
1044 read(inotify_fd, buf, nbytes);
1049 /* rules changed, set by inotify or a signal*/
1050 if (reload_config) {
1052 udev_rules_cleanup(&rules);
1053 udev_rules_init(&rules, 1);
1056 /* forked child has returned */
1057 if (sigchilds_waiting) {
1058 sigchilds_waiting = 0;
1065 msg_queue_manager();
1070 udev_rules_cleanup(&rules);
1073 if (signal_pipe[READ_END] > 0)
1074 close(signal_pipe[READ_END]);
1075 if (signal_pipe[WRITE_END] > 0)
1076 close(signal_pipe[WRITE_END]);
1082 if (uevent_netlink_sock > 0)
1083 close(uevent_netlink_sock);