+++ /dev/null
-/*
- * Copyright (C) 2004-2011 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"
-
-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)
-{
- if (debug) {
- char buf[1024];
- struct timespec ts;
-
- vsnprintf(buf, sizeof(buf), format, args);
- clock_gettime(CLOCK_MONOTONIC, &ts);
- fprintf(stderr, "[%llu.%06u] [%u] %s: %s",
- (unsigned long long) ts.tv_sec, (unsigned int) ts.tv_nsec/1000,
- (int) getpid(), fn, buf);
- } else {
- vsyslog(priority, 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);
-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 struct event *node_to_event(struct udev_list_node *node)
-{
- char *event;
-
- event = (char *)node;
- event -= offsetof(struct event, node);
- return (struct event *)event;
-}
-
-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 struct worker *node_to_worker(struct udev_list_node *node)
-{
- char *worker;
-
- worker = (char *)node;
- worker -= offsetof(struct worker, node);
- return (struct worker *)worker;
-}
-
-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);
- info(event->udev, "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;
- info(worker->udev, "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) {
- err(udev, "error creating signalfd %m\n");
- rc = 2;
- goto out;
- }
-
- fd_ep = epoll_create1(EPOLL_CLOEXEC);
- if (fd_ep < 0) {
- err(udev, "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) {
- err(udev, "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;
-
- info(udev, "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);
-
- info(udev, "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, ARRAY_SIZE(ev), -1);
- if (fdcount < 0) {
- if (errno == EINTR)
- continue;
- err = -errno;
- err(udev, "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);
- udev_log_close();
- exit(rc);
- }
- case -1:
- udev_monitor_unref(worker_monitor);
- event->state = EVENT_QUEUED;
- free(worker);
- err(udev, "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++;
- info(udev, "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) {
- err(event->udev, "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)
- info(event->udev, "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);
- info(event->udev, "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, int retain)
-{
- struct udev_list_node *loop;
- int max;
-
- if (children <= retain)
- return;
-
- max = children - retain;
-
- udev_list_node_foreach(loop, &worker_list) {
- struct worker *worker = node_to_worker(loop);
-
- if (max-- <= 0)
- break;
-
- 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)) {
- dbg(udev, "delay seq %llu (%s)\n", event->seqnum, event->devpath);
- 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) {
- info(udev, "udevd message (SET_LOG_PRIORITY) received, log_priority=%i\n", i);
- udev_set_log_priority(udev, i);
- worker_kill(udev, 0);
- }
-
- if (udev_ctrl_get_stop_exec_queue(ctrl_msg) > 0) {
- info(udev, "udevd message (STOP_EXEC_QUEUE) received\n");
- stop_exec_queue = true;
- }
-
- if (udev_ctrl_get_start_exec_queue(ctrl_msg) > 0) {
- info(udev, "udevd message (START_EXEC_QUEUE) received\n");
- stop_exec_queue = false;
- }
-
- if (udev_ctrl_get_reload(ctrl_msg) > 0) {
- info(udev, "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') {
- info(udev, "udevd message (ENV) received, unset '%s'\n", key);
- udev_add_property(udev, key, NULL);
- } else {
- info(udev, "udevd message (ENV) received, set '%s=%s'\n", key, val);
- udev_add_property(udev, key, val);
- }
- } else {
- err(udev, "wrong key format '%s'\n", key);
- }
- free(key);
- }
- worker_kill(udev, 0);
- }
-
- i = udev_ctrl_get_set_children_max(ctrl_msg);
- if (i >= 0) {
- info(udev, "udevd message (SET_MAX_CHILDREN) received, children_max=%i\n", i);
- children_max = i;
- }
-
- if (udev_ctrl_get_ping(ctrl_msg) > 0)
- info(udev, "udevd message (SYNC) received\n");
-
- if (udev_ctrl_get_exit(ctrl_msg) > 0) {
- info(udev, "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) {
- err(udev, "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) {
- info(udev, "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;
-
- info(udev, "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)
- info(udev, "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;
- info(udev, "worker [%u] exit\n", pid);
-
- if (WIFEXITED(status)) {
- if (WEXITSTATUS(status) != 0)
- err(udev, "worker [%u] exit with return code %i\n", pid, WEXITSTATUS(status));
- } else if (WIFSIGNALED(status)) {
- err(udev, "worker [%u] terminated by signal %i (%s)\n",
- pid, WTERMSIG(status), strsignal(WTERMSIG(status)));
- } else if (WIFSTOPPED(status)) {
- err(udev, "worker [%u] stopped\n", pid);
- } else if (WIFCONTINUED(status)) {
- err(udev, "worker [%u] continued\n", pid);
- } else {
- err(udev, "worker [%u] exit with status 0x%04x\n", pid, status);
- }
-
- if (!WIFEXITED(status) || WEXITSTATUS(status) != 0) {
- if (worker->event) {
- err(udev, "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), udev_get_dev_path(udev), "/", devname, NULL);
- util_create_path_selinux(udev, filename);
- udev_selinux_setfscreatecon(udev, filename, mode);
- info(udev, "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);
- udev_selinux_resetfscreatecon(udev);
- }
-
- fclose(f);
-}
-
-static int copy_dev_dir(struct udev *udev, DIR *dir_from, DIR *dir_to, int maxdepth)
-{
- struct dirent *dent;
-
- for (dent = readdir(dir_from); dent != NULL; dent = readdir(dir_from)) {
- struct stat stats;
-
- if (dent->d_name[0] == '.')
- continue;
- if (fstatat(dirfd(dir_from), dent->d_name, &stats, AT_SYMLINK_NOFOLLOW) != 0)
- continue;
-
- if (S_ISBLK(stats.st_mode) || S_ISCHR(stats.st_mode)) {
- udev_selinux_setfscreateconat(udev, dirfd(dir_to), dent->d_name, stats.st_mode & 0777);
- if (mknodat(dirfd(dir_to), dent->d_name, stats.st_mode, stats.st_rdev) == 0) {
- fchmodat(dirfd(dir_to), dent->d_name, stats.st_mode & 0777, 0);
- fchownat(dirfd(dir_to), dent->d_name, stats.st_uid, stats.st_gid, 0);
- } else {
- utimensat(dirfd(dir_to), dent->d_name, NULL, 0);
- }
- udev_selinux_resetfscreatecon(udev);
- } else if (S_ISLNK(stats.st_mode)) {
- char target[UTIL_PATH_SIZE];
- ssize_t len;
-
- len = readlinkat(dirfd(dir_from), dent->d_name, target, sizeof(target));
- if (len <= 0 || len == (ssize_t)sizeof(target))
- continue;
- target[len] = '\0';
- udev_selinux_setfscreateconat(udev, dirfd(dir_to), dent->d_name, S_IFLNK);
- if (symlinkat(target, dirfd(dir_to), dent->d_name) < 0 && errno == EEXIST)
- utimensat(dirfd(dir_to), dent->d_name, NULL, AT_SYMLINK_NOFOLLOW);
- udev_selinux_resetfscreatecon(udev);
- } else if (S_ISDIR(stats.st_mode)) {
- DIR *dir2_from, *dir2_to;
-
- if (maxdepth == 0)
- continue;
-
- udev_selinux_setfscreateconat(udev, dirfd(dir_to), dent->d_name, S_IFDIR|0755);
- mkdirat(dirfd(dir_to), dent->d_name, 0755);
- udev_selinux_resetfscreatecon(udev);
-
- dir2_to = fdopendir(openat(dirfd(dir_to), dent->d_name, O_RDONLY|O_NONBLOCK|O_DIRECTORY|O_CLOEXEC));
- if (dir2_to == NULL)
- continue;
-
- dir2_from = fdopendir(openat(dirfd(dir_from), dent->d_name, O_RDONLY|O_NONBLOCK|O_DIRECTORY|O_CLOEXEC));
- if (dir2_from == NULL) {
- closedir(dir2_to);
- continue;
- }
-
- copy_dev_dir(udev, dir2_from, dir2_to, maxdepth-1);
-
- closedir(dir2_to);
- closedir(dir2_from);
- }
- }
-
- return 0;
-}
-
-static void static_dev_create_links(struct udev *udev, DIR *dir)
-{
- struct stdlinks {
- const char *link;
- const char *target;
- };
- static const struct stdlinks stdlinks[] = {
- { "core", "/proc/kcore" },
- { "fd", "/proc/self/fd" },
- { "stdin", "/proc/self/fd/0" },
- { "stdout", "/proc/self/fd/1" },
- { "stderr", "/proc/self/fd/2" },
- };
- unsigned int i;
-
- for (i = 0; i < ARRAY_SIZE(stdlinks); i++) {
- struct stat sb;
-
- if (stat(stdlinks[i].target, &sb) == 0) {
- udev_selinux_setfscreateconat(udev, dirfd(dir), stdlinks[i].link, S_IFLNK);
- if (symlinkat(stdlinks[i].target, dirfd(dir), stdlinks[i].link) < 0 && errno == EEXIST)
- utimensat(dirfd(dir), stdlinks[i].link, NULL, AT_SYMLINK_NOFOLLOW);
- udev_selinux_resetfscreatecon(udev);
- }
- }
-}
-
-static void static_dev_create_from_devices(struct udev *udev, DIR *dir)
-{
- DIR *dir_from;
-
- dir_from = opendir(PKGLIBEXECDIR "/devices");
- if (dir_from == NULL)
- return;
- copy_dev_dir(udev, dir_from, dir, 8);
- closedir(dir_from);
-}
-
-static void static_dev_create(struct udev *udev)
-{
- DIR *dir;
-
- dir = opendir(udev_get_dev_path(udev));
- if (dir == NULL)
- return;
-
- static_dev_create_links(udev, dir);
- static_dev_create_from_devices(udev, dir);
-
- closedir(dir);
-}
-
-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 */
- util_strscpyl(filename, sizeof(filename), udev_get_run_path(udev), "/data", NULL);
- if (access(filename, F_OK) >= 0)
- return 0;
-
- /* make sure we do not get here again */
- util_create_path(udev, filename);
- mkdir(filename, 0755);
-
- /* old database */
- util_strscpyl(filename, sizeof(filename), udev_get_dev_path(udev), "/.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), udev_get_dev_path(udev), "/.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), udev_get_dev_path(udev),
- "/.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), udev_get_dev_path(udev), "/.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;
-
- info(udev, "ctrl=%i netlink=%i\n", ctrl, netlink);
- *rctrl = ctrl;
- *rnetlink = netlink;
- return 0;
-}
-
-static bool check_rules_timestamp(struct udev *udev)
-{
- char **p;
- unsigned long long *stamp_usec;
- int i, n;
- bool changed = false;
-
- n = udev_get_rules_path(udev, &p, &stamp_usec);
- for (i = 0; i < n; i++) {
- struct stat stats;
-
- if (stat(p[i], &stats) < 0)
- continue;
-
- if (stamp_usec[i] == ts_usec(&stats.st_mtim))
- continue;
-
- /* first check */
- if (stamp_usec[i] != 0) {
- info(udev, "reload - timestamp of '%s' changed\n", p[i]);
- changed = true;
- }
-
- /* update timestamp */
- stamp_usec[i] = ts_usec(&stats.st_mtim);
- }
-
- return changed;
-}
-
-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;
- struct epoll_event ep_ctrl, ep_inotify, ep_signal, ep_netlink, ep_worker;
- struct udev_ctrl_connection *ctrl_conn = NULL;
- char **s;
- int rc = 1;
-
- udev = udev_new();
- if (udev == NULL)
- goto exit;
-
- udev_log_init("udevd");
- udev_set_log_fn(udev, udev_main_log);
- info(udev, "version %s\n", VERSION);
- udev_selinux_init(udev);
-
- 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;
- if (udev_get_log_priority(udev) < LOG_INFO)
- 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");
- err(udev, "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");
- err(udev, "root privileges required\n");
- goto exit;
- }
-
- /* set umask before creating any file/directory */
- chdir("/");
- umask(022);
-
- /* /run/udev */
- mkdir(udev_get_run_path(udev), 0755);
-
- /* create standard links, copy static nodes, create nodes from modules */
- static_dev_create(udev);
- 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");
- err(udev, "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) {
- err(udev, "error taking over udev control socket");
- rc = 1;
- goto exit;
- }
-
- monitor = udev_monitor_new_from_netlink_fd(udev, "kernel", fd_netlink);
- if (monitor == NULL) {
- err(udev, "error taking over netlink socket\n");
- rc = 3;
- goto exit;
- }
- } else {
- /* open control and netlink socket */
- udev_ctrl = udev_ctrl_new(udev);
- if (udev_ctrl == NULL) {
- fprintf(stderr, "error initializing udev control socket");
- err(udev, "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");
- err(udev, "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");
- err(udev, "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");
- err(udev, "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) {
- err(udev, "error creating queue file\n");
- goto exit;
- }
-
- if (daemonize) {
- pid_t pid;
- int fd;
-
- pid = fork();
- switch (pid) {
- case 0:
- break;
- case -1:
- err(udev, "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);
- if (fd < 0) {
- /* Fallback to old interface */
- fd = open("/proc/self/oom_adj", O_RDWR);
- if (fd < 0) {
- err(udev, "error disabling OOM: %m\n");
- } else {
- /* OOM_DISABLE == -17 */
- write(fd, "-17", 3);
- close(fd);
- }
- } else {
- 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");
- err(udev, "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");
- err(udev, "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");
- err(udev, "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) {
- err(udev, "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) {
- err(udev, "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) {
- err(udev, "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;
- }
- info(udev, "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, 0);
-
- /* 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 <= 2) {
- /* we are idle */
- timeout = -1;
- } else {
- /* kill idle or hanging workers */
- timeout = 3 * 1000;
- }
- fdcount = epoll_wait(fd_ep, ev, ARRAY_SIZE(ev), timeout);
- if (fdcount < 0)
- continue;
-
- if (fdcount == 0) {
- struct udev_list_node *loop;
-
- /* timeout */
- if (udev_exit) {
- err(udev, "timeout, giving up waiting for workers to finish\n");
- break;
- }
-
- /* kill idle workers */
- if (udev_list_node_is_empty(&event_list)) {
- info(udev, "cleanup idle workers\n");
- worker_kill(udev, 2);
- }
-
- /* 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) {
- err(udev, "worker [%u] 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) {
- err(udev, "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 (check_rules_timestamp(udev))
- 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, 0);
- 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);
- udev_selinux_exit(udev);
- udev_unref(udev);
- udev_log_close();
- return rc;
-}
~ianmdlvl / elogind.git / blobdiff