| /* |
| * Copyright (C) 2004-2012 Kay Sievers <kay.sievers@vrfy.org> |
| * Copyright (C) 2004 Chris Friesen <chris_friesen@sympatico.ca> |
| * Copyright (C) 2009 Canonical Ltd. |
| * Copyright (C) 2009 Scott James Remnant <scott@netsplit.com> |
| * |
| * This program is free software: you can redistribute it and/or modify |
| * it under the terms of the GNU General Public License as published by |
| * the Free Software Foundation, either version 2 of the License, or |
| * (at your option) any later version. |
| * |
| * This program is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| * GNU General Public License for more details. |
| * |
| * You should have received a copy of the GNU General Public License |
| * along with this program. If not, see <http://www.gnu.org/licenses/>. |
| */ |
| |
| #include <stddef.h> |
| #include <signal.h> |
| #include <unistd.h> |
| #include <errno.h> |
| #include <stdio.h> |
| #include <stdlib.h> |
| #include <stdbool.h> |
| #include <string.h> |
| #include <ctype.h> |
| #include <fcntl.h> |
| #include <time.h> |
| #include <getopt.h> |
| #include <dirent.h> |
| #include <sys/time.h> |
| #include <sys/prctl.h> |
| #include <sys/socket.h> |
| #include <sys/un.h> |
| #include <sys/signalfd.h> |
| #include <sys/epoll.h> |
| #include <sys/poll.h> |
| #include <sys/wait.h> |
| #include <sys/stat.h> |
| #include <sys/ioctl.h> |
| #include <sys/inotify.h> |
| #include <sys/utsname.h> |
| |
| #include "udev.h" |
| #include "sd-daemon.h" |
| #include "cgroup-util.h" |
| #include "dev-setup.h" |
| |
| static bool debug; |
| |
| void udev_main_log(struct udev *udev, int priority, |
| const char *file, int line, const char *fn, |
| const char *format, va_list args) |
| { |
| log_metav(priority, file, line, fn, format, args); |
| } |
| |
| static struct udev_rules *rules; |
| static struct udev_queue_export *udev_queue_export; |
| static struct udev_ctrl *udev_ctrl; |
| static struct udev_monitor *monitor; |
| static int worker_watch[2] = { -1, -1 }; |
| static int fd_signal = -1; |
| static int fd_ep = -1; |
| static int fd_inotify = -1; |
| static bool stop_exec_queue; |
| static bool reload; |
| static int children; |
| static int children_max; |
| static int exec_delay; |
| static sigset_t sigmask_orig; |
| static UDEV_LIST(event_list); |
| static UDEV_LIST(worker_list); |
| char *udev_cgroup; |
| static bool udev_exit; |
| |
| enum event_state { |
| EVENT_UNDEF, |
| EVENT_QUEUED, |
| EVENT_RUNNING, |
| }; |
| |
| struct event { |
| struct udev_list_node node; |
| struct udev *udev; |
| struct udev_device *dev; |
| enum event_state state; |
| int exitcode; |
| unsigned long long int delaying_seqnum; |
| unsigned long long int seqnum; |
| const char *devpath; |
| size_t devpath_len; |
| const char *devpath_old; |
| dev_t devnum; |
| bool is_block; |
| int ifindex; |
| }; |
| |
| static inline struct event *node_to_event(struct udev_list_node *node) |
| { |
| return container_of(node, struct event, node); |
| } |
| |
| static void event_queue_cleanup(struct udev *udev, enum event_state type); |
| |
| enum worker_state { |
| WORKER_UNDEF, |
| WORKER_RUNNING, |
| WORKER_IDLE, |
| WORKER_KILLED, |
| }; |
| |
| struct worker { |
| struct udev_list_node node; |
| struct udev *udev; |
| int refcount; |
| pid_t pid; |
| struct udev_monitor *monitor; |
| enum worker_state state; |
| struct event *event; |
| unsigned long long event_start_usec; |
| }; |
| |
| /* passed from worker to main process */ |
| struct worker_message { |
| pid_t pid; |
| int exitcode; |
| }; |
| |
| static inline struct worker *node_to_worker(struct udev_list_node *node) |
| { |
| return container_of(node, struct worker, node); |
| } |
| |
| static void event_queue_delete(struct event *event, bool export) |
| { |
| udev_list_node_remove(&event->node); |
| |
| if (export) { |
| udev_queue_export_device_finished(udev_queue_export, event->dev); |
| log_debug("seq %llu done with %i\n", udev_device_get_seqnum(event->dev), event->exitcode); |
| } |
| udev_device_unref(event->dev); |
| free(event); |
| } |
| |
| static struct worker *worker_ref(struct worker *worker) |
| { |
| worker->refcount++; |
| return worker; |
| } |
| |
| static void worker_cleanup(struct worker *worker) |
| { |
| udev_list_node_remove(&worker->node); |
| udev_monitor_unref(worker->monitor); |
| children--; |
| free(worker); |
| } |
| |
| static void worker_unref(struct worker *worker) |
| { |
| worker->refcount--; |
| if (worker->refcount > 0) |
| return; |
| log_debug("worker [%u] cleaned up\n", worker->pid); |
| worker_cleanup(worker); |
| } |
| |
| static void worker_list_cleanup(struct udev *udev) |
| { |
| struct udev_list_node *loop, *tmp; |
| |
| udev_list_node_foreach_safe(loop, tmp, &worker_list) { |
| struct worker *worker = node_to_worker(loop); |
| |
| worker_cleanup(worker); |
| } |
| } |
| |
| static void worker_new(struct event *event) |
| { |
| struct udev *udev = event->udev; |
| struct worker *worker; |
| struct udev_monitor *worker_monitor; |
| pid_t pid; |
| |
| /* listen for new events */ |
| worker_monitor = udev_monitor_new_from_netlink(udev, NULL); |
| if (worker_monitor == NULL) |
| return; |
| /* allow the main daemon netlink address to send devices to the worker */ |
| udev_monitor_allow_unicast_sender(worker_monitor, monitor); |
| udev_monitor_enable_receiving(worker_monitor); |
| |
| worker = calloc(1, sizeof(struct worker)); |
| if (worker == NULL) { |
| udev_monitor_unref(worker_monitor); |
| return; |
| } |
| /* worker + event reference */ |
| worker->refcount = 2; |
| worker->udev = udev; |
| |
| pid = fork(); |
| switch (pid) { |
| case 0: { |
| struct udev_device *dev = NULL; |
| int fd_monitor; |
| struct epoll_event ep_signal, ep_monitor; |
| sigset_t mask; |
| int rc = EXIT_SUCCESS; |
| |
| /* take initial device from queue */ |
| dev = event->dev; |
| event->dev = NULL; |
| |
| free(worker); |
| worker_list_cleanup(udev); |
| event_queue_cleanup(udev, EVENT_UNDEF); |
| udev_queue_export_unref(udev_queue_export); |
| udev_monitor_unref(monitor); |
| udev_ctrl_unref(udev_ctrl); |
| close(fd_signal); |
| close(fd_ep); |
| close(worker_watch[READ_END]); |
| |
| sigfillset(&mask); |
| fd_signal = signalfd(-1, &mask, SFD_NONBLOCK|SFD_CLOEXEC); |
| if (fd_signal < 0) { |
| log_error("error creating signalfd %m\n"); |
| rc = 2; |
| goto out; |
| } |
| |
| fd_ep = epoll_create1(EPOLL_CLOEXEC); |
| if (fd_ep < 0) { |
| log_error("error creating epoll fd: %m\n"); |
| rc = 3; |
| goto out; |
| } |
| |
| memset(&ep_signal, 0, sizeof(struct epoll_event)); |
| ep_signal.events = EPOLLIN; |
| ep_signal.data.fd = fd_signal; |
| |
| fd_monitor = udev_monitor_get_fd(worker_monitor); |
| memset(&ep_monitor, 0, sizeof(struct epoll_event)); |
| ep_monitor.events = EPOLLIN; |
| ep_monitor.data.fd = fd_monitor; |
| |
| if (epoll_ctl(fd_ep, EPOLL_CTL_ADD, fd_signal, &ep_signal) < 0 || |
| epoll_ctl(fd_ep, EPOLL_CTL_ADD, fd_monitor, &ep_monitor) < 0) { |
| log_error("fail to add fds to epoll: %m\n"); |
| rc = 4; |
| goto out; |
| } |
| |
| /* request TERM signal if parent exits */ |
| prctl(PR_SET_PDEATHSIG, SIGTERM); |
| |
| for (;;) { |
| struct udev_event *udev_event; |
| struct worker_message msg; |
| int err; |
| |
| log_debug("seq %llu running\n", udev_device_get_seqnum(dev)); |
| udev_event = udev_event_new(dev); |
| if (udev_event == NULL) { |
| rc = 5; |
| goto out; |
| } |
| |
| /* needed for SIGCHLD/SIGTERM in spawn() */ |
| udev_event->fd_signal = fd_signal; |
| |
| if (exec_delay > 0) |
| udev_event->exec_delay = exec_delay; |
| |
| /* apply rules, create node, symlinks */ |
| err = udev_event_execute_rules(udev_event, rules, &sigmask_orig); |
| |
| if (err == 0) |
| udev_event_execute_run(udev_event, &sigmask_orig); |
| |
| /* apply/restore inotify watch */ |
| if (err == 0 && udev_event->inotify_watch) { |
| udev_watch_begin(udev, dev); |
| udev_device_update_db(dev); |
| } |
| |
| /* send processed event back to libudev listeners */ |
| udev_monitor_send_device(worker_monitor, NULL, dev); |
| |
| /* send udevd the result of the event execution */ |
| memset(&msg, 0, sizeof(struct worker_message)); |
| if (err != 0) |
| msg.exitcode = err; |
| msg.pid = getpid(); |
| send(worker_watch[WRITE_END], &msg, sizeof(struct worker_message), 0); |
| |
| log_debug("seq %llu processed with %i\n", udev_device_get_seqnum(dev), err); |
| |
| udev_device_unref(dev); |
| dev = NULL; |
| |
| if (udev_event->sigterm) { |
| udev_event_unref(udev_event); |
| goto out; |
| } |
| |
| udev_event_unref(udev_event); |
| |
| /* wait for more device messages from main udevd, or term signal */ |
| while (dev == NULL) { |
| struct epoll_event ev[4]; |
| int fdcount; |
| int i; |
| |
| fdcount = epoll_wait(fd_ep, ev, ELEMENTSOF(ev), -1); |
| if (fdcount < 0) { |
| if (errno == EINTR) |
| continue; |
| log_error("failed to poll: %m\n"); |
| goto out; |
| } |
| |
| for (i = 0; i < fdcount; i++) { |
| if (ev[i].data.fd == fd_monitor && ev[i].events & EPOLLIN) { |
| dev = udev_monitor_receive_device(worker_monitor); |
| break; |
| } else if (ev[i].data.fd == fd_signal && ev[i].events & EPOLLIN) { |
| struct signalfd_siginfo fdsi; |
| ssize_t size; |
| |
| size = read(fd_signal, &fdsi, sizeof(struct signalfd_siginfo)); |
| if (size != sizeof(struct signalfd_siginfo)) |
| continue; |
| switch (fdsi.ssi_signo) { |
| case SIGTERM: |
| goto out; |
| } |
| } |
| } |
| } |
| } |
| out: |
| udev_device_unref(dev); |
| if (fd_signal >= 0) |
| close(fd_signal); |
| if (fd_ep >= 0) |
| close(fd_ep); |
| close(fd_inotify); |
| close(worker_watch[WRITE_END]); |
| udev_rules_unref(rules); |
| udev_builtin_exit(udev); |
| udev_monitor_unref(worker_monitor); |
| udev_unref(udev); |
| log_close(); |
| exit(rc); |
| } |
| case -1: |
| udev_monitor_unref(worker_monitor); |
| event->state = EVENT_QUEUED; |
| free(worker); |
| log_error("fork of child failed: %m\n"); |
| break; |
| default: |
| /* close monitor, but keep address around */ |
| udev_monitor_disconnect(worker_monitor); |
| worker->monitor = worker_monitor; |
| worker->pid = pid; |
| worker->state = WORKER_RUNNING; |
| worker->event_start_usec = now_usec(); |
| worker->event = event; |
| event->state = EVENT_RUNNING; |
| udev_list_node_append(&worker->node, &worker_list); |
| children++; |
| log_debug("seq %llu forked new worker [%u]\n", udev_device_get_seqnum(event->dev), pid); |
| break; |
| } |
| } |
| |
| static void event_run(struct event *event) |
| { |
| struct udev_list_node *loop; |
| |
| udev_list_node_foreach(loop, &worker_list) { |
| struct worker *worker = node_to_worker(loop); |
| ssize_t count; |
| |
| if (worker->state != WORKER_IDLE) |
| continue; |
| |
| count = udev_monitor_send_device(monitor, worker->monitor, event->dev); |
| if (count < 0) { |
| log_error("worker [%u] did not accept message %zi (%m), kill it\n", worker->pid, count); |
| kill(worker->pid, SIGKILL); |
| worker->state = WORKER_KILLED; |
| continue; |
| } |
| worker_ref(worker); |
| worker->event = event; |
| worker->state = WORKER_RUNNING; |
| worker->event_start_usec = now_usec(); |
| event->state = EVENT_RUNNING; |
| return; |
| } |
| |
| if (children >= children_max) { |
| if (children_max > 1) |
| log_debug("maximum number (%i) of children reached\n", children); |
| return; |
| } |
| |
| /* start new worker and pass initial device */ |
| worker_new(event); |
| } |
| |
| static int event_queue_insert(struct udev_device *dev) |
| { |
| struct event *event; |
| |
| event = calloc(1, sizeof(struct event)); |
| if (event == NULL) |
| return -1; |
| |
| event->udev = udev_device_get_udev(dev); |
| event->dev = dev; |
| event->seqnum = udev_device_get_seqnum(dev); |
| event->devpath = udev_device_get_devpath(dev); |
| event->devpath_len = strlen(event->devpath); |
| event->devpath_old = udev_device_get_devpath_old(dev); |
| event->devnum = udev_device_get_devnum(dev); |
| event->is_block = (strcmp("block", udev_device_get_subsystem(dev)) == 0); |
| event->ifindex = udev_device_get_ifindex(dev); |
| |
| udev_queue_export_device_queued(udev_queue_export, dev); |
| log_debug("seq %llu queued, '%s' '%s'\n", udev_device_get_seqnum(dev), |
| udev_device_get_action(dev), udev_device_get_subsystem(dev)); |
| |
| event->state = EVENT_QUEUED; |
| udev_list_node_append(&event->node, &event_list); |
| return 0; |
| } |
| |
| static void worker_kill(struct udev *udev) |
| { |
| struct udev_list_node *loop; |
| |
| udev_list_node_foreach(loop, &worker_list) { |
| struct worker *worker = node_to_worker(loop); |
| |
| if (worker->state == WORKER_KILLED) |
| continue; |
| |
| worker->state = WORKER_KILLED; |
| kill(worker->pid, SIGTERM); |
| } |
| } |
| |
| /* lookup event for identical, parent, child device */ |
| static bool is_devpath_busy(struct event *event) |
| { |
| struct udev_list_node *loop; |
| size_t common; |
| |
| /* check if queue contains events we depend on */ |
| udev_list_node_foreach(loop, &event_list) { |
| struct event *loop_event = node_to_event(loop); |
| |
| /* we already found a later event, earlier can not block us, no need to check again */ |
| if (loop_event->seqnum < event->delaying_seqnum) |
| continue; |
| |
| /* event we checked earlier still exists, no need to check again */ |
| if (loop_event->seqnum == event->delaying_seqnum) |
| return true; |
| |
| /* found ourself, no later event can block us */ |
| if (loop_event->seqnum >= event->seqnum) |
| break; |
| |
| /* check major/minor */ |
| if (major(event->devnum) != 0 && event->devnum == loop_event->devnum && event->is_block == loop_event->is_block) |
| return true; |
| |
| /* check network device ifindex */ |
| if (event->ifindex != 0 && event->ifindex == loop_event->ifindex) |
| return true; |
| |
| /* check our old name */ |
| if (event->devpath_old != NULL && strcmp(loop_event->devpath, event->devpath_old) == 0) { |
| event->delaying_seqnum = loop_event->seqnum; |
| return true; |
| } |
| |
| /* compare devpath */ |
| common = MIN(loop_event->devpath_len, event->devpath_len); |
| |
| /* one devpath is contained in the other? */ |
| if (memcmp(loop_event->devpath, event->devpath, common) != 0) |
| continue; |
| |
| /* identical device event found */ |
| if (loop_event->devpath_len == event->devpath_len) { |
| /* devices names might have changed/swapped in the meantime */ |
| if (major(event->devnum) != 0 && (event->devnum != loop_event->devnum || event->is_block != loop_event->is_block)) |
| continue; |
| if (event->ifindex != 0 && event->ifindex != loop_event->ifindex) |
| continue; |
| event->delaying_seqnum = loop_event->seqnum; |
| return true; |
| } |
| |
| /* parent device event found */ |
| if (event->devpath[common] == '/') { |
| event->delaying_seqnum = loop_event->seqnum; |
| return true; |
| } |
| |
| /* child device event found */ |
| if (loop_event->devpath[common] == '/') { |
| event->delaying_seqnum = loop_event->seqnum; |
| return true; |
| } |
| |
| /* no matching device */ |
| continue; |
| } |
| |
| return false; |
| } |
| |
| static void event_queue_start(struct udev *udev) |
| { |
| struct udev_list_node *loop; |
| |
| udev_list_node_foreach(loop, &event_list) { |
| struct event *event = node_to_event(loop); |
| |
| if (event->state != EVENT_QUEUED) |
| continue; |
| |
| /* do not start event if parent or child event is still running */ |
| if (is_devpath_busy(event)) |
| continue; |
| |
| event_run(event); |
| } |
| } |
| |
| static void event_queue_cleanup(struct udev *udev, enum event_state match_type) |
| { |
| struct udev_list_node *loop, *tmp; |
| |
| udev_list_node_foreach_safe(loop, tmp, &event_list) { |
| struct event *event = node_to_event(loop); |
| |
| if (match_type != EVENT_UNDEF && match_type != event->state) |
| continue; |
| |
| event_queue_delete(event, false); |
| } |
| } |
| |
| static void worker_returned(int fd_worker) |
| { |
| for (;;) { |
| struct worker_message msg; |
| ssize_t size; |
| struct udev_list_node *loop; |
| |
| size = recv(fd_worker, &msg, sizeof(struct worker_message), MSG_DONTWAIT); |
| if (size != sizeof(struct worker_message)) |
| break; |
| |
| /* lookup worker who sent the signal */ |
| udev_list_node_foreach(loop, &worker_list) { |
| struct worker *worker = node_to_worker(loop); |
| |
| if (worker->pid != msg.pid) |
| continue; |
| |
| /* worker returned */ |
| if (worker->event) { |
| worker->event->exitcode = msg.exitcode; |
| event_queue_delete(worker->event, true); |
| worker->event = NULL; |
| } |
| if (worker->state != WORKER_KILLED) |
| worker->state = WORKER_IDLE; |
| worker_unref(worker); |
| break; |
| } |
| } |
| } |
| |
| /* receive the udevd message from userspace */ |
| static struct udev_ctrl_connection *handle_ctrl_msg(struct udev_ctrl *uctrl) |
| { |
| struct udev *udev = udev_ctrl_get_udev(uctrl); |
| struct udev_ctrl_connection *ctrl_conn; |
| struct udev_ctrl_msg *ctrl_msg = NULL; |
| const char *str; |
| int i; |
| |
| ctrl_conn = udev_ctrl_get_connection(uctrl); |
| if (ctrl_conn == NULL) |
| goto out; |
| |
| ctrl_msg = udev_ctrl_receive_msg(ctrl_conn); |
| if (ctrl_msg == NULL) |
| goto out; |
| |
| i = udev_ctrl_get_set_log_level(ctrl_msg); |
| if (i >= 0) { |
| log_debug("udevd message (SET_LOG_PRIORITY) received, log_priority=%i\n", i); |
| log_set_max_level(i); |
| udev_set_log_priority(udev, i); |
| worker_kill(udev); |
| } |
| |
| if (udev_ctrl_get_stop_exec_queue(ctrl_msg) > 0) { |
| log_debug("udevd message (STOP_EXEC_QUEUE) received\n"); |
| stop_exec_queue = true; |
| } |
| |
| if (udev_ctrl_get_start_exec_queue(ctrl_msg) > 0) { |
| log_debug("udevd message (START_EXEC_QUEUE) received\n"); |
| stop_exec_queue = false; |
| } |
| |
| if (udev_ctrl_get_reload(ctrl_msg) > 0) { |
| log_debug("udevd message (RELOAD) received\n"); |
| reload = true; |
| } |
| |
| str = udev_ctrl_get_set_env(ctrl_msg); |
| if (str != NULL) { |
| char *key; |
| |
| key = strdup(str); |
| if (key != NULL) { |
| char *val; |
| |
| val = strchr(key, '='); |
| if (val != NULL) { |
| val[0] = '\0'; |
| val = &val[1]; |
| if (val[0] == '\0') { |
| log_debug("udevd message (ENV) received, unset '%s'\n", key); |
| udev_add_property(udev, key, NULL); |
| } else { |
| log_debug("udevd message (ENV) received, set '%s=%s'\n", key, val); |
| udev_add_property(udev, key, val); |
| } |
| } else { |
| log_error("wrong key format '%s'\n", key); |
| } |
| free(key); |
| } |
| worker_kill(udev); |
| } |
| |
| i = udev_ctrl_get_set_children_max(ctrl_msg); |
| if (i >= 0) { |
| log_debug("udevd message (SET_MAX_CHILDREN) received, children_max=%i\n", i); |
| children_max = i; |
| } |
| |
| if (udev_ctrl_get_ping(ctrl_msg) > 0) |
| log_debug("udevd message (SYNC) received\n"); |
| |
| if (udev_ctrl_get_exit(ctrl_msg) > 0) { |
| log_debug("udevd message (EXIT) received\n"); |
| udev_exit = true; |
| /* keep reference to block the client until we exit */ |
| udev_ctrl_connection_ref(ctrl_conn); |
| } |
| out: |
| udev_ctrl_msg_unref(ctrl_msg); |
| return udev_ctrl_connection_unref(ctrl_conn); |
| } |
| |
| /* read inotify messages */ |
| static int handle_inotify(struct udev *udev) |
| { |
| int nbytes, pos; |
| char *buf; |
| struct inotify_event *ev; |
| |
| if ((ioctl(fd_inotify, FIONREAD, &nbytes) < 0) || (nbytes <= 0)) |
| return 0; |
| |
| buf = malloc(nbytes); |
| if (buf == NULL) { |
| log_error("error getting buffer for inotify\n"); |
| return -1; |
| } |
| |
| nbytes = read(fd_inotify, buf, nbytes); |
| |
| for (pos = 0; pos < nbytes; pos += sizeof(struct inotify_event) + ev->len) { |
| struct udev_device *dev; |
| |
| ev = (struct inotify_event *)(buf + pos); |
| dev = udev_watch_lookup(udev, ev->wd); |
| if (dev != NULL) { |
| log_debug("inotify event: %x for %s\n", ev->mask, udev_device_get_devnode(dev)); |
| if (ev->mask & IN_CLOSE_WRITE) { |
| char filename[UTIL_PATH_SIZE]; |
| int fd; |
| |
| log_debug("device %s closed, synthesising 'change'\n", udev_device_get_devnode(dev)); |
| util_strscpyl(filename, sizeof(filename), udev_device_get_syspath(dev), "/uevent", NULL); |
| fd = open(filename, O_WRONLY); |
| if (fd >= 0) { |
| if (write(fd, "change", 6) < 0) |
| log_debug("error writing uevent: %m\n"); |
| close(fd); |
| } |
| } |
| if (ev->mask & IN_IGNORED) |
| udev_watch_end(udev, dev); |
| |
| udev_device_unref(dev); |
| } |
| |
| } |
| |
| free(buf); |
| return 0; |
| } |
| |
| static void handle_signal(struct udev *udev, int signo) |
| { |
| switch (signo) { |
| case SIGINT: |
| case SIGTERM: |
| udev_exit = true; |
| break; |
| case SIGCHLD: |
| for (;;) { |
| pid_t pid; |
| int status; |
| struct udev_list_node *loop, *tmp; |
| |
| pid = waitpid(-1, &status, WNOHANG); |
| if (pid <= 0) |
| break; |
| |
| udev_list_node_foreach_safe(loop, tmp, &worker_list) { |
| struct worker *worker = node_to_worker(loop); |
| |
| if (worker->pid != pid) |
| continue; |
| log_debug("worker [%u] exit\n", pid); |
| |
| if (WIFEXITED(status)) { |
| if (WEXITSTATUS(status) != 0) |
| log_error("worker [%u] exit with return code %i\n", pid, WEXITSTATUS(status)); |
| } else if (WIFSIGNALED(status)) { |
| log_error("worker [%u] terminated by signal %i (%s)\n", |
| pid, WTERMSIG(status), strsignal(WTERMSIG(status))); |
| } else if (WIFSTOPPED(status)) { |
| log_error("worker [%u] stopped\n", pid); |
| } else if (WIFCONTINUED(status)) { |
| log_error("worker [%u] continued\n", pid); |
| } else { |
| log_error("worker [%u] exit with status 0x%04x\n", pid, status); |
| } |
| |
| if (!WIFEXITED(status) || WEXITSTATUS(status) != 0) { |
| if (worker->event) { |
| log_error("worker [%u] failed while handling '%s'\n", |
| pid, worker->event->devpath); |
| worker->event->exitcode = -32; |
| event_queue_delete(worker->event, true); |
| /* drop reference taken for state 'running' */ |
| worker_unref(worker); |
| } |
| } |
| worker_unref(worker); |
| break; |
| } |
| } |
| break; |
| case SIGHUP: |
| reload = true; |
| break; |
| } |
| } |
| |
| static void static_dev_create_from_modules(struct udev *udev) |
| { |
| struct utsname kernel; |
| char modules[UTIL_PATH_SIZE]; |
| char buf[4096]; |
| FILE *f; |
| |
| uname(&kernel); |
| util_strscpyl(modules, sizeof(modules), "/lib/modules/", kernel.release, "/modules.devname", NULL); |
| f = fopen(modules, "r"); |
| if (f == NULL) |
| return; |
| |
| while (fgets(buf, sizeof(buf), f) != NULL) { |
| char *s; |
| const char *modname; |
| const char *devname; |
| const char *devno; |
| int maj, min; |
| char type; |
| mode_t mode; |
| char filename[UTIL_PATH_SIZE]; |
| |
| if (buf[0] == '#') |
| continue; |
| |
| modname = buf; |
| s = strchr(modname, ' '); |
| if (s == NULL) |
| continue; |
| s[0] = '\0'; |
| |
| devname = &s[1]; |
| s = strchr(devname, ' '); |
| if (s == NULL) |
| continue; |
| s[0] = '\0'; |
| |
| devno = &s[1]; |
| s = strchr(devno, ' '); |
| if (s == NULL) |
| s = strchr(devno, '\n'); |
| if (s != NULL) |
| s[0] = '\0'; |
| if (sscanf(devno, "%c%u:%u", &type, &maj, &min) != 3) |
| continue; |
| |
| if (type == 'c') |
| mode = S_IFCHR; |
| else if (type == 'b') |
| mode = S_IFBLK; |
| else |
| continue; |
| |
| util_strscpyl(filename, sizeof(filename), "/dev/", devname, NULL); |
| mkdir_parents(filename, 0755); |
| label_context_set(filename, mode); |
| log_debug("mknod '%s' %c%u:%u\n", filename, type, maj, min); |
| if (mknod(filename, mode, makedev(maj, min)) < 0 && errno == EEXIST) |
| utimensat(AT_FDCWD, filename, NULL, 0); |
| label_context_clear(); |
| } |
| |
| fclose(f); |
| } |
| |
| static int mem_size_mb(void) |
| { |
| FILE *f; |
| char buf[4096]; |
| long int memsize = -1; |
| |
| f = fopen("/proc/meminfo", "r"); |
| if (f == NULL) |
| return -1; |
| |
| while (fgets(buf, sizeof(buf), f) != NULL) { |
| long int value; |
| |
| if (sscanf(buf, "MemTotal: %ld kB", &value) == 1) { |
| memsize = value / 1024; |
| break; |
| } |
| } |
| |
| fclose(f); |
| return memsize; |
| } |
| |
| static int convert_db(struct udev *udev) |
| { |
| char filename[UTIL_PATH_SIZE]; |
| FILE *f; |
| struct udev_enumerate *udev_enumerate; |
| struct udev_list_entry *list_entry; |
| |
| /* current database */ |
| if (access("/run/udev/data", F_OK) >= 0) |
| return 0; |
| |
| /* make sure we do not get here again */ |
| mkdir_parents("/run/udev/data", 0755); |
| mkdir(filename, 0755); |
| |
| /* old database */ |
| util_strscpyl(filename, sizeof(filename), "/dev/.udev/db", NULL); |
| if (access(filename, F_OK) < 0) |
| return 0; |
| |
| f = fopen("/dev/kmsg", "w"); |
| if (f != NULL) { |
| fprintf(f, "<30>udevd[%u]: converting old udev database\n", getpid()); |
| fclose(f); |
| } |
| |
| udev_enumerate = udev_enumerate_new(udev); |
| if (udev_enumerate == NULL) |
| return -1; |
| udev_enumerate_scan_devices(udev_enumerate); |
| udev_list_entry_foreach(list_entry, udev_enumerate_get_list_entry(udev_enumerate)) { |
| struct udev_device *device; |
| |
| device = udev_device_new_from_syspath(udev, udev_list_entry_get_name(list_entry)); |
| if (device == NULL) |
| continue; |
| |
| /* try to find the old database for devices without a current one */ |
| if (udev_device_read_db(device, NULL) < 0) { |
| bool have_db; |
| const char *id; |
| struct stat stats; |
| char devpath[UTIL_PATH_SIZE]; |
| char from[UTIL_PATH_SIZE]; |
| |
| have_db = false; |
| |
| /* find database in old location */ |
| id = udev_device_get_id_filename(device); |
| util_strscpyl(from, sizeof(from), "/dev/.udev/db/", id, NULL); |
| if (lstat(from, &stats) == 0) { |
| if (!have_db) { |
| udev_device_read_db(device, from); |
| have_db = true; |
| } |
| unlink(from); |
| } |
| |
| /* find old database with $subsys:$sysname name */ |
| util_strscpyl(from, sizeof(from), "/dev/.udev/db/", |
| udev_device_get_subsystem(device), ":", udev_device_get_sysname(device), NULL); |
| if (lstat(from, &stats) == 0) { |
| if (!have_db) { |
| udev_device_read_db(device, from); |
| have_db = true; |
| } |
| unlink(from); |
| } |
| |
| /* find old database with the encoded devpath name */ |
| util_path_encode(udev_device_get_devpath(device), devpath, sizeof(devpath)); |
| util_strscpyl(from, sizeof(from), "/dev/.udev/db/", devpath, NULL); |
| if (lstat(from, &stats) == 0) { |
| if (!have_db) { |
| udev_device_read_db(device, from); |
| have_db = true; |
| } |
| unlink(from); |
| } |
| |
| /* write out new database */ |
| if (have_db) |
| udev_device_update_db(device); |
| } |
| udev_device_unref(device); |
| } |
| udev_enumerate_unref(udev_enumerate); |
| return 0; |
| } |
| |
| static int systemd_fds(struct udev *udev, int *rctrl, int *rnetlink) |
| { |
| int ctrl = -1, netlink = -1; |
| int fd, n; |
| |
| n = sd_listen_fds(true); |
| if (n <= 0) |
| return -1; |
| |
| for (fd = SD_LISTEN_FDS_START; fd < n + SD_LISTEN_FDS_START; fd++) { |
| if (sd_is_socket(fd, AF_LOCAL, SOCK_SEQPACKET, -1)) { |
| if (ctrl >= 0) |
| return -1; |
| ctrl = fd; |
| continue; |
| } |
| |
| if (sd_is_socket(fd, AF_NETLINK, SOCK_RAW, -1)) { |
| if (netlink >= 0) |
| return -1; |
| netlink = fd; |
| continue; |
| } |
| |
| return -1; |
| } |
| |
| if (ctrl < 0 || netlink < 0) |
| return -1; |
| |
| log_debug("ctrl=%i netlink=%i\n", ctrl, netlink); |
| *rctrl = ctrl; |
| *rnetlink = netlink; |
| return 0; |
| } |
| |
| int main(int argc, char *argv[]) |
| { |
| struct udev *udev; |
| FILE *f; |
| sigset_t mask; |
| int daemonize = false; |
| int resolve_names = 1; |
| static const struct option options[] = { |
| { "daemon", no_argument, NULL, 'd' }, |
| { "debug", no_argument, NULL, 'D' }, |
| { "children-max", required_argument, NULL, 'c' }, |
| { "exec-delay", required_argument, NULL, 'e' }, |
| { "resolve-names", required_argument, NULL, 'N' }, |
| { "help", no_argument, NULL, 'h' }, |
| { "version", no_argument, NULL, 'V' }, |
| {} |
| }; |
| int fd_ctrl = -1; |
| int fd_netlink = -1; |
| int fd_worker = -1; |
| const char *prefixes[] = { "/dev", "/run", NULL }; |
| struct epoll_event ep_ctrl, ep_inotify, ep_signal, ep_netlink, ep_worker; |
| struct udev_ctrl_connection *ctrl_conn = NULL; |
| int rc = 1; |
| |
| udev = udev_new(); |
| if (udev == NULL) |
| goto exit; |
| |
| log_open(); |
| log_parse_environment(); |
| udev_set_log_fn(udev, udev_main_log); |
| log_debug("version %s\n", VERSION); |
| label_init(prefixes); |
| |
| for (;;) { |
| int option; |
| |
| option = getopt_long(argc, argv, "c:deDtN:hV", options, NULL); |
| if (option == -1) |
| break; |
| |
| switch (option) { |
| case 'd': |
| daemonize = true; |
| break; |
| case 'c': |
| children_max = strtoul(optarg, NULL, 0); |
| break; |
| case 'e': |
| exec_delay = strtoul(optarg, NULL, 0); |
| break; |
| case 'D': |
| debug = true; |
| log_set_max_level(LOG_DEBUG); |
| udev_set_log_priority(udev, LOG_INFO); |
| break; |
| case 'N': |
| if (strcmp (optarg, "early") == 0) { |
| resolve_names = 1; |
| } else if (strcmp (optarg, "late") == 0) { |
| resolve_names = 0; |
| } else if (strcmp (optarg, "never") == 0) { |
| resolve_names = -1; |
| } else { |
| fprintf(stderr, "resolve-names must be early, late or never\n"); |
| log_error("resolve-names must be early, late or never\n"); |
| goto exit; |
| } |
| break; |
| case 'h': |
| printf("Usage: udevd OPTIONS\n" |
| " --daemon\n" |
| " --debug\n" |
| " --children-max=<maximum number of workers>\n" |
| " --exec-delay=<seconds to wait before executing RUN=>\n" |
| " --resolve-names=early|late|never\n" |
| " --version\n" |
| " --help\n" |
| "\n"); |
| goto exit; |
| case 'V': |
| printf("%s\n", VERSION); |
| goto exit; |
| default: |
| goto exit; |
| } |
| } |
| |
| /* |
| * read the kernel commandline, in case we need to get into debug mode |
| * udev.log-priority=<level> syslog priority |
| * udev.children-max=<number of workers> events are fully serialized if set to 1 |
| * |
| */ |
| f = fopen("/proc/cmdline", "r"); |
| if (f != NULL) { |
| char cmdline[4096]; |
| |
| if (fgets(cmdline, sizeof(cmdline), f) != NULL) { |
| char *pos; |
| |
| pos = strstr(cmdline, "udev.log-priority="); |
| if (pos != NULL) { |
| pos += strlen("udev.log-priority="); |
| udev_set_log_priority(udev, util_log_priority(pos)); |
| } |
| |
| pos = strstr(cmdline, "udev.children-max="); |
| if (pos != NULL) { |
| pos += strlen("udev.children-max="); |
| children_max = strtoul(pos, NULL, 0); |
| } |
| |
| pos = strstr(cmdline, "udev.exec-delay="); |
| if (pos != NULL) { |
| pos += strlen("udev.exec-delay="); |
| exec_delay = strtoul(pos, NULL, 0); |
| } |
| } |
| fclose(f); |
| } |
| |
| if (getuid() != 0) { |
| fprintf(stderr, "root privileges required\n"); |
| log_error("root privileges required\n"); |
| goto exit; |
| } |
| |
| /* set umask before creating any file/directory */ |
| chdir("/"); |
| umask(022); |
| |
| mkdir("/run/udev", 0755); |
| |
| dev_setup(); |
| static_dev_create_from_modules(udev); |
| |
| /* before opening new files, make sure std{in,out,err} fds are in a sane state */ |
| if (daemonize) { |
| int fd; |
| |
| fd = open("/dev/null", O_RDWR); |
| if (fd >= 0) { |
| if (write(STDOUT_FILENO, 0, 0) < 0) |
| dup2(fd, STDOUT_FILENO); |
| if (write(STDERR_FILENO, 0, 0) < 0) |
| dup2(fd, STDERR_FILENO); |
| if (fd > STDERR_FILENO) |
| close(fd); |
| } else { |
| fprintf(stderr, "cannot open /dev/null\n"); |
| log_error("cannot open /dev/null\n"); |
| } |
| } |
| |
| if (systemd_fds(udev, &fd_ctrl, &fd_netlink) >= 0) { |
| /* get control and netlink socket from from systemd */ |
| udev_ctrl = udev_ctrl_new_from_fd(udev, fd_ctrl); |
| if (udev_ctrl == NULL) { |
| log_error("error taking over udev control socket"); |
| rc = 1; |
| goto exit; |
| } |
| |
| monitor = udev_monitor_new_from_netlink_fd(udev, "kernel", fd_netlink); |
| if (monitor == NULL) { |
| log_error("error taking over netlink socket\n"); |
| rc = 3; |
| goto exit; |
| } |
| |
| /* get our own cgroup, we regularly kill everything udev has left behind */ |
| if (cg_get_by_pid(SYSTEMD_CGROUP_CONTROLLER, 0, &udev_cgroup) < 0) |
| udev_cgroup = NULL; |
| } else { |
| /* open control and netlink socket */ |
| udev_ctrl = udev_ctrl_new(udev); |
| if (udev_ctrl == NULL) { |
| fprintf(stderr, "error initializing udev control socket"); |
| log_error("error initializing udev control socket"); |
| rc = 1; |
| goto exit; |
| } |
| fd_ctrl = udev_ctrl_get_fd(udev_ctrl); |
| |
| monitor = udev_monitor_new_from_netlink(udev, "kernel"); |
| if (monitor == NULL) { |
| fprintf(stderr, "error initializing netlink socket\n"); |
| log_error("error initializing netlink socket\n"); |
| rc = 3; |
| goto exit; |
| } |
| fd_netlink = udev_monitor_get_fd(monitor); |
| } |
| |
| if (udev_monitor_enable_receiving(monitor) < 0) { |
| fprintf(stderr, "error binding netlink socket\n"); |
| log_error("error binding netlink socket\n"); |
| rc = 3; |
| goto exit; |
| } |
| |
| if (udev_ctrl_enable_receiving(udev_ctrl) < 0) { |
| fprintf(stderr, "error binding udev control socket\n"); |
| log_error("error binding udev control socket\n"); |
| rc = 1; |
| goto exit; |
| } |
| |
| udev_monitor_set_receive_buffer_size(monitor, 128*1024*1024); |
| |
| /* create queue file before signalling 'ready', to make sure we block 'settle' */ |
| udev_queue_export = udev_queue_export_new(udev); |
| if (udev_queue_export == NULL) { |
| log_error("error creating queue file\n"); |
| goto exit; |
| } |
| |
| if (daemonize) { |
| pid_t pid; |
| int fd; |
| |
| pid = fork(); |
| switch (pid) { |
| case 0: |
| break; |
| case -1: |
| log_error("fork of daemon failed: %m\n"); |
| rc = 4; |
| goto exit; |
| default: |
| rc = EXIT_SUCCESS; |
| goto exit_daemonize; |
| } |
| |
| setsid(); |
| |
| fd = open("/proc/self/oom_score_adj", O_RDWR|O_CLOEXEC); |
| if (fd >= 0) { |
| write(fd, "-1000", 5); |
| close(fd); |
| } |
| } else { |
| sd_notify(1, "READY=1"); |
| } |
| |
| f = fopen("/dev/kmsg", "w"); |
| if (f != NULL) { |
| fprintf(f, "<30>udevd[%u]: starting version " VERSION "\n", getpid()); |
| fclose(f); |
| } |
| |
| if (!debug) { |
| int fd; |
| |
| fd = open("/dev/null", O_RDWR); |
| if (fd >= 0) { |
| dup2(fd, STDIN_FILENO); |
| dup2(fd, STDOUT_FILENO); |
| dup2(fd, STDERR_FILENO); |
| close(fd); |
| } |
| } |
| |
| fd_inotify = udev_watch_init(udev); |
| if (fd_inotify < 0) { |
| fprintf(stderr, "error initializing inotify\n"); |
| log_error("error initializing inotify\n"); |
| rc = 4; |
| goto exit; |
| } |
| udev_watch_restore(udev); |
| |
| /* block and listen to all signals on signalfd */ |
| sigfillset(&mask); |
| sigprocmask(SIG_SETMASK, &mask, &sigmask_orig); |
| fd_signal = signalfd(-1, &mask, SFD_NONBLOCK|SFD_CLOEXEC); |
| if (fd_signal < 0) { |
| fprintf(stderr, "error creating signalfd\n"); |
| log_error("error creating signalfd\n"); |
| rc = 5; |
| goto exit; |
| } |
| |
| /* unnamed socket from workers to the main daemon */ |
| if (socketpair(AF_LOCAL, SOCK_DGRAM|SOCK_CLOEXEC, 0, worker_watch) < 0) { |
| fprintf(stderr, "error creating socketpair\n"); |
| log_error("error creating socketpair\n"); |
| rc = 6; |
| goto exit; |
| } |
| fd_worker = worker_watch[READ_END]; |
| |
| udev_builtin_init(udev); |
| |
| rules = udev_rules_new(udev, resolve_names); |
| if (rules == NULL) { |
| log_error("error reading rules\n"); |
| goto exit; |
| } |
| |
| memset(&ep_ctrl, 0, sizeof(struct epoll_event)); |
| ep_ctrl.events = EPOLLIN; |
| ep_ctrl.data.fd = fd_ctrl; |
| |
| memset(&ep_inotify, 0, sizeof(struct epoll_event)); |
| ep_inotify.events = EPOLLIN; |
| ep_inotify.data.fd = fd_inotify; |
| |
| memset(&ep_signal, 0, sizeof(struct epoll_event)); |
| ep_signal.events = EPOLLIN; |
| ep_signal.data.fd = fd_signal; |
| |
| memset(&ep_netlink, 0, sizeof(struct epoll_event)); |
| ep_netlink.events = EPOLLIN; |
| ep_netlink.data.fd = fd_netlink; |
| |
| memset(&ep_worker, 0, sizeof(struct epoll_event)); |
| ep_worker.events = EPOLLIN; |
| ep_worker.data.fd = fd_worker; |
| |
| fd_ep = epoll_create1(EPOLL_CLOEXEC); |
| if (fd_ep < 0) { |
| log_error("error creating epoll fd: %m\n"); |
| goto exit; |
| } |
| if (epoll_ctl(fd_ep, EPOLL_CTL_ADD, fd_ctrl, &ep_ctrl) < 0 || |
| epoll_ctl(fd_ep, EPOLL_CTL_ADD, fd_inotify, &ep_inotify) < 0 || |
| epoll_ctl(fd_ep, EPOLL_CTL_ADD, fd_signal, &ep_signal) < 0 || |
| epoll_ctl(fd_ep, EPOLL_CTL_ADD, fd_netlink, &ep_netlink) < 0 || |
| epoll_ctl(fd_ep, EPOLL_CTL_ADD, fd_worker, &ep_worker) < 0) { |
| log_error("fail to add fds to epoll: %m\n"); |
| goto exit; |
| } |
| |
| /* if needed, convert old database from earlier udev version */ |
| convert_db(udev); |
| |
| if (children_max <= 0) { |
| int memsize = mem_size_mb(); |
| |
| /* set value depending on the amount of RAM */ |
| if (memsize > 0) |
| children_max = 128 + (memsize / 8); |
| else |
| children_max = 128; |
| } |
| log_debug("set children_max to %u\n", children_max); |
| |
| udev_rules_apply_static_dev_perms(rules); |
| |
| udev_list_node_init(&event_list); |
| udev_list_node_init(&worker_list); |
| |
| for (;;) { |
| static unsigned long long last_usec; |
| struct epoll_event ev[8]; |
| int fdcount; |
| int timeout; |
| bool is_worker, is_signal, is_inotify, is_netlink, is_ctrl; |
| int i; |
| |
| if (udev_exit) { |
| /* close sources of new events and discard buffered events */ |
| if (fd_ctrl >= 0) { |
| epoll_ctl(fd_ep, EPOLL_CTL_DEL, fd_ctrl, NULL); |
| fd_ctrl = -1; |
| } |
| if (monitor != NULL) { |
| epoll_ctl(fd_ep, EPOLL_CTL_DEL, fd_netlink, NULL); |
| udev_monitor_unref(monitor); |
| monitor = NULL; |
| } |
| if (fd_inotify >= 0) { |
| epoll_ctl(fd_ep, EPOLL_CTL_DEL, fd_inotify, NULL); |
| close(fd_inotify); |
| fd_inotify = -1; |
| } |
| |
| /* discard queued events and kill workers */ |
| event_queue_cleanup(udev, EVENT_QUEUED); |
| worker_kill(udev); |
| |
| /* exit after all has cleaned up */ |
| if (udev_list_node_is_empty(&event_list) && udev_list_node_is_empty(&worker_list)) |
| break; |
| |
| /* timeout at exit for workers to finish */ |
| timeout = 30 * 1000; |
| } else if (udev_list_node_is_empty(&event_list) && !children) { |
| /* we are idle */ |
| timeout = -1; |
| |
| /* cleanup possible left-over processes in our cgroup */ |
| if (udev_cgroup) |
| cg_kill(SYSTEMD_CGROUP_CONTROLLER, udev_cgroup, SIGKILL, false, true, NULL); |
| } else { |
| /* kill idle or hanging workers */ |
| timeout = 3 * 1000; |
| } |
| fdcount = epoll_wait(fd_ep, ev, ELEMENTSOF(ev), timeout); |
| if (fdcount < 0) |
| continue; |
| |
| if (fdcount == 0) { |
| struct udev_list_node *loop; |
| |
| /* timeout */ |
| if (udev_exit) { |
| log_error("timeout, giving up waiting for workers to finish\n"); |
| break; |
| } |
| |
| /* kill idle workers */ |
| if (udev_list_node_is_empty(&event_list)) { |
| log_debug("cleanup idle workers\n"); |
| worker_kill(udev); |
| } |
| |
| /* check for hanging events */ |
| udev_list_node_foreach(loop, &worker_list) { |
| struct worker *worker = node_to_worker(loop); |
| |
| if (worker->state != WORKER_RUNNING) |
| continue; |
| |
| if ((now_usec() - worker->event_start_usec) > 30 * 1000 * 1000) { |
| log_error("worker [%u] %s timeout; kill it\n", worker->pid, |
| worker->event ? worker->event->devpath : "<idle>"); |
| kill(worker->pid, SIGKILL); |
| worker->state = WORKER_KILLED; |
| /* drop reference taken for state 'running' */ |
| worker_unref(worker); |
| if (worker->event) { |
| log_error("seq %llu '%s' killed\n", |
| udev_device_get_seqnum(worker->event->dev), worker->event->devpath); |
| worker->event->exitcode = -64; |
| event_queue_delete(worker->event, true); |
| worker->event = NULL; |
| } |
| } |
| } |
| |
| } |
| |
| is_worker = is_signal = is_inotify = is_netlink = is_ctrl = false; |
| for (i = 0; i < fdcount; i++) { |
| if (ev[i].data.fd == fd_worker && ev[i].events & EPOLLIN) |
| is_worker = true; |
| else if (ev[i].data.fd == fd_netlink && ev[i].events & EPOLLIN) |
| is_netlink = true; |
| else if (ev[i].data.fd == fd_signal && ev[i].events & EPOLLIN) |
| is_signal = true; |
| else if (ev[i].data.fd == fd_inotify && ev[i].events & EPOLLIN) |
| is_inotify = true; |
| else if (ev[i].data.fd == fd_ctrl && ev[i].events & EPOLLIN) |
| is_ctrl = true; |
| } |
| |
| /* check for changed config, every 3 seconds at most */ |
| if ((now_usec() - last_usec) > 3 * 1000 * 1000) { |
| if (udev_rules_check_timestamp(rules)) |
| reload = true; |
| if (udev_builtin_validate(udev)) |
| reload = true; |
| |
| last_usec = now_usec(); |
| } |
| |
| /* reload requested, HUP signal received, rules changed, builtin changed */ |
| if (reload) { |
| worker_kill(udev); |
| rules = udev_rules_unref(rules); |
| udev_builtin_exit(udev); |
| reload = 0; |
| } |
| |
| /* event has finished */ |
| if (is_worker) |
| worker_returned(fd_worker); |
| |
| if (is_netlink) { |
| struct udev_device *dev; |
| |
| dev = udev_monitor_receive_device(monitor); |
| if (dev != NULL) { |
| udev_device_set_usec_initialized(dev, now_usec()); |
| if (event_queue_insert(dev) < 0) |
| udev_device_unref(dev); |
| } |
| } |
| |
| /* start new events */ |
| if (!udev_list_node_is_empty(&event_list) && !udev_exit && !stop_exec_queue) { |
| if (rules == NULL) |
| rules = udev_rules_new(udev, resolve_names); |
| if (rules != NULL) |
| event_queue_start(udev); |
| } |
| |
| if (is_signal) { |
| struct signalfd_siginfo fdsi; |
| ssize_t size; |
| |
| size = read(fd_signal, &fdsi, sizeof(struct signalfd_siginfo)); |
| if (size == sizeof(struct signalfd_siginfo)) |
| handle_signal(udev, fdsi.ssi_signo); |
| } |
| |
| /* we are shutting down, the events below are not handled anymore */ |
| if (udev_exit) |
| continue; |
| |
| /* device node watch */ |
| if (is_inotify) |
| handle_inotify(udev); |
| |
| /* |
| * This needs to be after the inotify handling, to make sure, |
| * that the ping is send back after the possibly generated |
| * "change" events by the inotify device node watch. |
| * |
| * A single time we may receive a client connection which we need to |
| * keep open to block the client. It will be closed right before we |
| * exit. |
| */ |
| if (is_ctrl) |
| ctrl_conn = handle_ctrl_msg(udev_ctrl); |
| } |
| |
| rc = EXIT_SUCCESS; |
| exit: |
| udev_queue_export_cleanup(udev_queue_export); |
| udev_ctrl_cleanup(udev_ctrl); |
| exit_daemonize: |
| if (fd_ep >= 0) |
| close(fd_ep); |
| worker_list_cleanup(udev); |
| event_queue_cleanup(udev, EVENT_UNDEF); |
| udev_rules_unref(rules); |
| udev_builtin_exit(udev); |
| if (fd_signal >= 0) |
| close(fd_signal); |
| if (worker_watch[READ_END] >= 0) |
| close(worker_watch[READ_END]); |
| if (worker_watch[WRITE_END] >= 0) |
| close(worker_watch[WRITE_END]); |
| udev_monitor_unref(monitor); |
| udev_queue_export_unref(udev_queue_export); |
| udev_ctrl_connection_unref(ctrl_conn); |
| udev_ctrl_unref(udev_ctrl); |
| label_finish(); |
| udev_unref(udev); |
| log_close(); |
| return rc; |
| } |