0254e9448f
There is alot of cleanup that will have to happen to turn on -fstrict-aliasing, but I think our code should be "correct" to the rule.
1541 lines
58 KiB
C
1541 lines
58 KiB
C
/*
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* Copyright (C) 2004-2012 Kay Sievers <kay@vrfy.org>
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* Copyright (C) 2004 Chris Friesen <chris_friesen@sympatico.ca>
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* Copyright (C) 2009 Canonical Ltd.
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* Copyright (C) 2009 Scott James Remnant <scott@netsplit.com>
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <stddef.h>
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#include <signal.h>
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#include <unistd.h>
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#include <errno.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <stdbool.h>
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#include <string.h>
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#include <ctype.h>
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#include <fcntl.h>
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#include <time.h>
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#include <getopt.h>
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#include <dirent.h>
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#include <sys/file.h>
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#include <sys/time.h>
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#include <sys/prctl.h>
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#include <sys/socket.h>
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#include <sys/un.h>
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#include <sys/signalfd.h>
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#include <sys/epoll.h>
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#include <sys/mount.h>
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#include <sys/poll.h>
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#include <sys/wait.h>
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#include <sys/stat.h>
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#include <sys/ioctl.h>
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#include <sys/inotify.h>
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#include <sys/utsname.h>
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#include "udev.h"
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#include "udev-util.h"
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#include "rtnl-util.h"
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#include "sd-daemon.h"
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#include "cgroup-util.h"
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#include "dev-setup.h"
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#include "fileio.h"
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static struct udev_rules *rules;
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static struct udev_ctrl *udev_ctrl;
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static struct udev_monitor *monitor;
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static int worker_watch[2] = { -1, -1 };
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static int fd_signal = -1;
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static int fd_ep = -1;
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static int fd_inotify = -1;
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static bool stop_exec_queue;
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static bool reload;
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static int children;
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static bool arg_debug = false;
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static int arg_daemonize = false;
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static int arg_resolve_names = 1;
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static int arg_children_max;
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static int arg_exec_delay;
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static usec_t arg_event_timeout_usec = 180 * USEC_PER_SEC;
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static usec_t arg_event_timeout_warn_usec = 180 * USEC_PER_SEC / 3;
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static sigset_t sigmask_orig;
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static UDEV_LIST(event_list);
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static UDEV_LIST(worker_list);
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static char *udev_cgroup;
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static struct udev_list properties_list;
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static bool udev_exit;
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enum event_state {
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EVENT_UNDEF,
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EVENT_QUEUED,
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EVENT_RUNNING,
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};
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struct event {
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struct udev_list_node node;
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struct udev *udev;
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struct udev_device *dev;
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enum event_state state;
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int exitcode;
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unsigned long long int delaying_seqnum;
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unsigned long long int seqnum;
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const char *devpath;
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size_t devpath_len;
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const char *devpath_old;
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dev_t devnum;
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int ifindex;
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bool is_block;
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};
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static inline struct event *node_to_event(struct udev_list_node *node) {
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return container_of(node, struct event, node);
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}
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static void event_queue_cleanup(struct udev *udev, enum event_state type);
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enum worker_state {
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WORKER_UNDEF,
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WORKER_RUNNING,
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WORKER_IDLE,
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WORKER_KILLED,
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};
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struct worker {
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struct udev_list_node node;
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struct udev *udev;
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int refcount;
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pid_t pid;
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struct udev_monitor *monitor;
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enum worker_state state;
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struct event *event;
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usec_t event_start_usec;
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bool event_warned;
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};
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/* passed from worker to main process */
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struct worker_message {
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pid_t pid;
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int exitcode;
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};
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static inline struct worker *node_to_worker(struct udev_list_node *node) {
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return container_of(node, struct worker, node);
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}
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static void event_queue_delete(struct event *event) {
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udev_list_node_remove(&event->node);
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udev_device_unref(event->dev);
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free(event);
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}
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static struct worker *worker_ref(struct worker *worker) {
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worker->refcount++;
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return worker;
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}
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static void worker_cleanup(struct worker *worker) {
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udev_list_node_remove(&worker->node);
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udev_monitor_unref(worker->monitor);
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children--;
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free(worker);
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}
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static void worker_unref(struct worker *worker) {
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worker->refcount--;
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if (worker->refcount > 0)
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return;
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log_debug("worker [%u] cleaned up", worker->pid);
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worker_cleanup(worker);
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}
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static void worker_list_cleanup(struct udev *udev) {
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struct udev_list_node *loop, *tmp;
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udev_list_node_foreach_safe(loop, tmp, &worker_list) {
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struct worker *worker = node_to_worker(loop);
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worker_cleanup(worker);
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}
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}
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static void worker_new(struct event *event) {
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struct udev *udev = event->udev;
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struct worker *worker;
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struct udev_monitor *worker_monitor;
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pid_t pid;
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/* listen for new events */
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worker_monitor = udev_monitor_new_from_netlink(udev, NULL);
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if (worker_monitor == NULL)
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return;
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/* allow the main daemon netlink address to send devices to the worker */
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udev_monitor_allow_unicast_sender(worker_monitor, monitor);
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udev_monitor_enable_receiving(worker_monitor);
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worker = new0(struct worker, 1);
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if (worker == NULL) {
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udev_monitor_unref(worker_monitor);
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return;
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}
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/* worker + event reference */
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worker->refcount = 2;
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worker->udev = udev;
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pid = fork();
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switch (pid) {
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case 0: {
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struct udev_device *dev = NULL;
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int fd_monitor;
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_cleanup_rtnl_unref_ sd_rtnl *rtnl = NULL;
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struct epoll_event ep_signal, ep_monitor;
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sigset_t mask;
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int rc = EXIT_SUCCESS;
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/* take initial device from queue */
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dev = event->dev;
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event->dev = NULL;
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free(worker);
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worker_list_cleanup(udev);
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event_queue_cleanup(udev, EVENT_UNDEF);
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udev_monitor_unref(monitor);
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udev_ctrl_unref(udev_ctrl);
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close(fd_signal);
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close(fd_ep);
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close(worker_watch[READ_END]);
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sigfillset(&mask);
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fd_signal = signalfd(-1, &mask, SFD_NONBLOCK|SFD_CLOEXEC);
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if (fd_signal < 0) {
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log_error_errno(errno, "error creating signalfd %m");
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rc = 2;
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goto out;
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}
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fd_ep = epoll_create1(EPOLL_CLOEXEC);
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if (fd_ep < 0) {
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log_error_errno(errno, "error creating epoll fd: %m");
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rc = 3;
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goto out;
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}
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memzero(&ep_signal, sizeof(struct epoll_event));
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ep_signal.events = EPOLLIN;
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ep_signal.data.fd = fd_signal;
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fd_monitor = udev_monitor_get_fd(worker_monitor);
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memzero(&ep_monitor, sizeof(struct epoll_event));
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ep_monitor.events = EPOLLIN;
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ep_monitor.data.fd = fd_monitor;
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if (epoll_ctl(fd_ep, EPOLL_CTL_ADD, fd_signal, &ep_signal) < 0 ||
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epoll_ctl(fd_ep, EPOLL_CTL_ADD, fd_monitor, &ep_monitor) < 0) {
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log_error_errno(errno, "fail to add fds to epoll: %m");
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rc = 4;
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goto out;
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}
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/* request TERM signal if parent exits */
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prctl(PR_SET_PDEATHSIG, SIGTERM);
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/* reset OOM score, we only protect the main daemon */
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write_string_file("/proc/self/oom_score_adj", "0");
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for (;;) {
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struct udev_event *udev_event;
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struct worker_message msg;
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int fd_lock = -1;
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int err = 0;
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log_debug("seq %llu running", udev_device_get_seqnum(dev));
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udev_event = udev_event_new(dev);
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if (udev_event == NULL) {
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rc = 5;
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goto out;
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}
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/* needed for SIGCHLD/SIGTERM in spawn() */
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udev_event->fd_signal = fd_signal;
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if (arg_exec_delay > 0)
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udev_event->exec_delay = arg_exec_delay;
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/*
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* Take a shared lock on the device node; this establishes
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* a concept of device "ownership" to serialize device
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* access. External processes holding an exclusive lock will
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* cause udev to skip the event handling; in the case udev
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* acquired the lock, the external process can block until
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* udev has finished its event handling.
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*/
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if (!streq_ptr(udev_device_get_action(dev), "remove") &&
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streq_ptr("block", udev_device_get_subsystem(dev)) &&
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!startswith(udev_device_get_sysname(dev), "dm-") &&
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!startswith(udev_device_get_sysname(dev), "md")) {
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struct udev_device *d = dev;
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if (streq_ptr("partition", udev_device_get_devtype(d)))
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d = udev_device_get_parent(d);
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if (d) {
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fd_lock = open(udev_device_get_devnode(d), O_RDONLY|O_CLOEXEC|O_NOFOLLOW|O_NONBLOCK);
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if (fd_lock >= 0 && flock(fd_lock, LOCK_SH|LOCK_NB) < 0) {
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log_debug_errno(errno, "Unable to flock(%s), skipping event handling: %m", udev_device_get_devnode(d));
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err = -EWOULDBLOCK;
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fd_lock = safe_close(fd_lock);
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goto skip;
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}
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}
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}
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/* needed for renaming netifs */
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udev_event->rtnl = rtnl;
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/* apply rules, create node, symlinks */
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udev_event_execute_rules(udev_event,
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arg_event_timeout_usec, arg_event_timeout_warn_usec,
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&properties_list,
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rules,
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&sigmask_orig);
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udev_event_execute_run(udev_event,
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arg_event_timeout_usec, arg_event_timeout_warn_usec,
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&sigmask_orig);
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if (udev_event->rtnl)
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/* in case rtnl was initialized */
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rtnl = sd_rtnl_ref(udev_event->rtnl);
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|
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/* apply/restore inotify watch */
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if (udev_event->inotify_watch) {
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udev_watch_begin(udev, dev);
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udev_device_update_db(dev);
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}
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safe_close(fd_lock);
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|
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/* send processed event back to libudev listeners */
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udev_monitor_send_device(worker_monitor, NULL, dev);
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skip:
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/* send udevd the result of the event execution */
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memzero(&msg, sizeof(struct worker_message));
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msg.exitcode = err;
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msg.pid = getpid();
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send(worker_watch[WRITE_END], &msg, sizeof(struct worker_message), 0);
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log_debug("seq %llu processed with %i", udev_device_get_seqnum(dev), err);
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udev_device_unref(dev);
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dev = NULL;
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|
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if (udev_event->sigterm) {
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udev_event_unref(udev_event);
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goto out;
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}
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udev_event_unref(udev_event);
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|
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/* wait for more device messages from main udevd, or term signal */
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while (dev == NULL) {
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struct epoll_event ev[4];
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int fdcount;
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int i;
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fdcount = epoll_wait(fd_ep, ev, ELEMENTSOF(ev), -1);
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if (fdcount < 0) {
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if (errno == EINTR)
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continue;
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log_error_errno(errno, "failed to poll: %m");
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goto out;
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}
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for (i = 0; i < fdcount; i++) {
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if (ev[i].data.fd == fd_monitor && ev[i].events & EPOLLIN) {
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dev = udev_monitor_receive_device(worker_monitor);
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break;
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} else if (ev[i].data.fd == fd_signal && ev[i].events & EPOLLIN) {
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struct signalfd_siginfo fdsi;
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ssize_t size;
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size = read(fd_signal, &fdsi, sizeof(struct signalfd_siginfo));
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if (size != sizeof(struct signalfd_siginfo))
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continue;
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switch (fdsi.ssi_signo) {
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case SIGTERM:
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goto out;
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}
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}
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}
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}
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}
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out:
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udev_device_unref(dev);
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safe_close(fd_signal);
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safe_close(fd_ep);
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close(fd_inotify);
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close(worker_watch[WRITE_END]);
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udev_rules_unref(rules);
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udev_builtin_exit(udev);
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udev_monitor_unref(worker_monitor);
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udev_unref(udev);
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log_close();
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exit(rc);
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}
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case -1:
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udev_monitor_unref(worker_monitor);
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event->state = EVENT_QUEUED;
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free(worker);
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log_error_errno(errno, "fork of child failed: %m");
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break;
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default:
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/* close monitor, but keep address around */
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udev_monitor_disconnect(worker_monitor);
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worker->monitor = worker_monitor;
|
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worker->pid = pid;
|
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worker->state = WORKER_RUNNING;
|
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worker->event_start_usec = now(CLOCK_MONOTONIC);
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worker->event_warned = false;
|
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worker->event = event;
|
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event->state = EVENT_RUNNING;
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udev_list_node_append(&worker->node, &worker_list);
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|
children++;
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log_debug("seq %llu forked new worker [%u]", udev_device_get_seqnum(event->dev), pid);
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break;
|
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}
|
|
}
|
|
|
|
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_errno(errno, "worker [%u] did not accept message %zi (%m), kill it", 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(CLOCK_MONOTONIC);
|
|
worker->event_warned = false;
|
|
event->state = EVENT_RUNNING;
|
|
return;
|
|
}
|
|
|
|
if (children >= arg_children_max) {
|
|
if (arg_children_max > 1)
|
|
log_debug("maximum number (%i) of children reached", 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 = new0(struct event, 1);
|
|
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 = streq("block", udev_device_get_subsystem(dev));
|
|
event->ifindex = udev_device_get_ifindex(dev);
|
|
|
|
log_debug("seq %llu queued, '%s' '%s'", 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 && streq(loop_event->devpath, event->devpath_old)) {
|
|
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);
|
|
}
|
|
}
|
|
|
|
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);
|
|
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_LEVEL) received, log_priority=%i", i);
|
|
log_set_max_level(i);
|
|
worker_kill(udev);
|
|
}
|
|
|
|
if (udev_ctrl_get_stop_exec_queue(ctrl_msg) > 0) {
|
|
log_debug("udevd message (STOP_EXEC_QUEUE) received");
|
|
stop_exec_queue = true;
|
|
}
|
|
|
|
if (udev_ctrl_get_start_exec_queue(ctrl_msg) > 0) {
|
|
log_debug("udevd message (START_EXEC_QUEUE) received");
|
|
stop_exec_queue = false;
|
|
}
|
|
|
|
if (udev_ctrl_get_reload(ctrl_msg) > 0) {
|
|
log_debug("udevd message (RELOAD) received");
|
|
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'", key);
|
|
udev_list_entry_add(&properties_list, key, NULL);
|
|
} else {
|
|
log_debug("udevd message (ENV) received, set '%s=%s'", key, val);
|
|
udev_list_entry_add(&properties_list, key, val);
|
|
}
|
|
} else {
|
|
log_error("wrong key format '%s'", 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", i);
|
|
arg_children_max = i;
|
|
}
|
|
|
|
if (udev_ctrl_get_ping(ctrl_msg) > 0)
|
|
log_debug("udevd message (SYNC) received");
|
|
|
|
if (udev_ctrl_get_exit(ctrl_msg) > 0) {
|
|
log_debug("udevd message (EXIT) received");
|
|
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);
|
|
}
|
|
|
|
static int synthesize_change(struct udev_device *dev) {
|
|
char filename[UTIL_PATH_SIZE];
|
|
int r;
|
|
|
|
if (streq_ptr("block", udev_device_get_subsystem(dev)) &&
|
|
streq_ptr("disk", udev_device_get_devtype(dev)) &&
|
|
!startswith(udev_device_get_sysname(dev), "dm-")) {
|
|
bool part_table_read = false;
|
|
bool has_partitions = false;
|
|
int fd;
|
|
struct udev *udev = udev_device_get_udev(dev);
|
|
_cleanup_udev_enumerate_unref_ struct udev_enumerate *e = NULL;
|
|
struct udev_list_entry *item;
|
|
|
|
/*
|
|
* Try to re-read the partition table. This only succeeds if
|
|
* none of the devices is busy. The kernel returns 0 if no
|
|
* partition table is found, and we will not get an event for
|
|
* the disk.
|
|
*/
|
|
fd = open(udev_device_get_devnode(dev), O_RDONLY|O_CLOEXEC|O_NOFOLLOW|O_NONBLOCK);
|
|
if (fd >= 0) {
|
|
r = flock(fd, LOCK_EX|LOCK_NB);
|
|
if (r >= 0)
|
|
r = ioctl(fd, BLKRRPART, 0);
|
|
|
|
close(fd);
|
|
if (r >= 0)
|
|
part_table_read = true;
|
|
}
|
|
|
|
/* search for partitions */
|
|
e = udev_enumerate_new(udev);
|
|
if (!e)
|
|
return -ENOMEM;
|
|
|
|
r = udev_enumerate_add_match_parent(e, dev);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
r = udev_enumerate_add_match_subsystem(e, "block");
|
|
if (r < 0)
|
|
return r;
|
|
|
|
r = udev_enumerate_scan_devices(e);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
udev_list_entry_foreach(item, udev_enumerate_get_list_entry(e)) {
|
|
_cleanup_udev_device_unref_ struct udev_device *d = NULL;
|
|
|
|
d = udev_device_new_from_syspath(udev, udev_list_entry_get_name(item));
|
|
if (!d)
|
|
continue;
|
|
|
|
if (!streq_ptr("partition", udev_device_get_devtype(d)))
|
|
continue;
|
|
|
|
has_partitions = true;
|
|
break;
|
|
}
|
|
|
|
/*
|
|
* We have partitions and re-read the table, the kernel already sent
|
|
* out a "change" event for the disk, and "remove/add" for all
|
|
* partitions.
|
|
*/
|
|
if (part_table_read && has_partitions)
|
|
return 0;
|
|
|
|
/*
|
|
* We have partitions but re-reading the partition table did not
|
|
* work, synthesize "change" for the disk and all partitions.
|
|
*/
|
|
log_debug("device %s closed, synthesising 'change'", udev_device_get_devnode(dev));
|
|
strscpyl(filename, sizeof(filename), udev_device_get_syspath(dev), "/uevent", NULL);
|
|
write_string_file(filename, "change");
|
|
|
|
udev_list_entry_foreach(item, udev_enumerate_get_list_entry(e)) {
|
|
_cleanup_udev_device_unref_ struct udev_device *d = NULL;
|
|
|
|
d = udev_device_new_from_syspath(udev, udev_list_entry_get_name(item));
|
|
if (!d)
|
|
continue;
|
|
|
|
if (!streq_ptr("partition", udev_device_get_devtype(d)))
|
|
continue;
|
|
|
|
log_debug("device %s closed, synthesising partition '%s' 'change'",
|
|
udev_device_get_devnode(dev), udev_device_get_devnode(d));
|
|
strscpyl(filename, sizeof(filename), udev_device_get_syspath(d), "/uevent", NULL);
|
|
write_string_file(filename, "change");
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
log_debug("device %s closed, synthesising 'change'", udev_device_get_devnode(dev));
|
|
strscpyl(filename, sizeof(filename), udev_device_get_syspath(dev), "/uevent", NULL);
|
|
write_string_file(filename, "change");
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int handle_inotify(struct udev *udev) {
|
|
union inotify_event_buffer buffer;
|
|
struct inotify_event *e;
|
|
ssize_t l;
|
|
|
|
l = read(fd_inotify, &buffer, sizeof(buffer));
|
|
if (l < 0) {
|
|
if (errno == EAGAIN || errno == EINTR)
|
|
return 0;
|
|
|
|
return log_error_errno(errno, "Failed to read inotify fd: %m");
|
|
}
|
|
|
|
FOREACH_INOTIFY_EVENT(e, buffer, l) {
|
|
struct udev_device *dev;
|
|
|
|
dev = udev_watch_lookup(udev, e->wd);
|
|
if (!dev)
|
|
continue;
|
|
|
|
log_debug("inotify event: %x for %s", e->mask, udev_device_get_devnode(dev));
|
|
if (e->mask & IN_CLOSE_WRITE)
|
|
synthesize_change(dev);
|
|
else if (e->mask & IN_IGNORED)
|
|
udev_watch_end(udev, dev);
|
|
|
|
udev_device_unref(dev);
|
|
}
|
|
|
|
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", pid);
|
|
|
|
if (WIFEXITED(status)) {
|
|
if (WEXITSTATUS(status) != 0)
|
|
log_error("worker [%u] exit with return code %i",
|
|
pid, WEXITSTATUS(status));
|
|
} else if (WIFSIGNALED(status)) {
|
|
log_error("worker [%u] terminated by signal %i (%s)",
|
|
pid, WTERMSIG(status), strsignal(WTERMSIG(status)));
|
|
} else if (WIFSTOPPED(status)) {
|
|
log_error("worker [%u] stopped", pid);
|
|
} else if (WIFCONTINUED(status)) {
|
|
log_error("worker [%u] continued", pid);
|
|
} else {
|
|
log_error("worker [%u] exit with status 0x%04x", pid, status);
|
|
}
|
|
|
|
if (!WIFEXITED(status) || WEXITSTATUS(status) != 0) {
|
|
if (worker->event) {
|
|
log_error("worker [%u] failed while handling '%s'",
|
|
pid, worker->event->devpath);
|
|
worker->event->exitcode = -32;
|
|
event_queue_delete(worker->event);
|
|
|
|
/* drop reference taken for state 'running' */
|
|
worker_unref(worker);
|
|
}
|
|
}
|
|
worker_unref(worker);
|
|
break;
|
|
}
|
|
}
|
|
break;
|
|
case SIGHUP:
|
|
reload = true;
|
|
break;
|
|
}
|
|
}
|
|
|
|
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", ctrl, netlink);
|
|
*rctrl = ctrl;
|
|
*rnetlink = netlink;
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* read the kernel command line, 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
|
|
* udev.exec-delay=<number of seconds> delay execution of every executed program
|
|
*/
|
|
static void kernel_cmdline_options(struct udev *udev) {
|
|
_cleanup_free_ char *line = NULL;
|
|
const char *word, *state;
|
|
size_t l;
|
|
int r;
|
|
|
|
r = proc_cmdline(&line);
|
|
if (r < 0) {
|
|
log_warning_errno(r, "Failed to read /proc/cmdline, ignoring: %m");
|
|
return;
|
|
}
|
|
|
|
FOREACH_WORD_QUOTED(word, l, line, state) {
|
|
char *s, *opt, *value;
|
|
|
|
s = strndup(word, l);
|
|
if (!s)
|
|
break;
|
|
|
|
/* accept the same options for the initrd, prefixed with "rd." */
|
|
if (in_initrd() && startswith(s, "rd."))
|
|
opt = s + 3;
|
|
else
|
|
opt = s;
|
|
|
|
if ((value = startswith(opt, "udev.log-priority="))) {
|
|
int prio;
|
|
|
|
prio = util_log_priority(value);
|
|
log_set_max_level(prio);
|
|
} else if ((value = startswith(opt, "udev.children-max="))) {
|
|
r = safe_atoi(value, &arg_children_max);
|
|
if (r < 0)
|
|
log_warning("Invalid udev.children-max ignored: %s", value);
|
|
} else if ((value = startswith(opt, "udev.exec-delay="))) {
|
|
r = safe_atoi(value, &arg_exec_delay);
|
|
if (r < 0)
|
|
log_warning("Invalid udev.exec-delay ignored: %s", value);
|
|
} else if ((value = startswith(opt, "udev.event-timeout="))) {
|
|
r = safe_atou64(value, &arg_event_timeout_usec);
|
|
if (r < 0) {
|
|
log_warning("Invalid udev.event-timeout ignored: %s", value);
|
|
break;
|
|
}
|
|
arg_event_timeout_usec *= USEC_PER_SEC;
|
|
arg_event_timeout_warn_usec = (arg_event_timeout_usec / 3) ? : 1;
|
|
}
|
|
|
|
free(s);
|
|
}
|
|
}
|
|
|
|
static void help(void) {
|
|
printf("%s [OPTIONS...]\n\n"
|
|
"Manages devices.\n\n"
|
|
" --daemon\n"
|
|
" --debug\n"
|
|
" --children-max=<maximum number of workers>\n"
|
|
" --exec-delay=<seconds to wait before executing RUN=>\n"
|
|
" --event-timeout=<seconds to wait before terminating an event>\n"
|
|
" --resolve-names=early|late|never\n"
|
|
" --version\n"
|
|
" --help\n"
|
|
, program_invocation_short_name);
|
|
}
|
|
|
|
static int parse_argv(int argc, char *argv[]) {
|
|
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' },
|
|
{ "event-timeout", required_argument, NULL, 't' },
|
|
{ "resolve-names", required_argument, NULL, 'N' },
|
|
{ "help", no_argument, NULL, 'h' },
|
|
{ "version", no_argument, NULL, 'V' },
|
|
{}
|
|
};
|
|
|
|
int c;
|
|
|
|
assert(argc >= 0);
|
|
assert(argv);
|
|
|
|
while ((c = getopt_long(argc, argv, "c:de:DtN:hV", options, NULL)) >= 0) {
|
|
int r;
|
|
|
|
switch (c) {
|
|
|
|
case 'd':
|
|
arg_daemonize = true;
|
|
break;
|
|
case 'c':
|
|
r = safe_atoi(optarg, &arg_children_max);
|
|
if (r < 0)
|
|
log_warning("Invalid --children-max ignored: %s", optarg);
|
|
break;
|
|
case 'e':
|
|
r = safe_atoi(optarg, &arg_exec_delay);
|
|
if (r < 0)
|
|
log_warning("Invalid --exec-delay ignored: %s", optarg);
|
|
break;
|
|
case 't':
|
|
r = safe_atou64(optarg, &arg_event_timeout_usec);
|
|
if (r < 0)
|
|
log_warning("Invalid --event-timeout ignored: %s", optarg);
|
|
else {
|
|
arg_event_timeout_usec *= USEC_PER_SEC;
|
|
arg_event_timeout_warn_usec = (arg_event_timeout_usec / 3) ? : 1;
|
|
}
|
|
break;
|
|
case 'D':
|
|
arg_debug = true;
|
|
break;
|
|
case 'N':
|
|
if (streq(optarg, "early")) {
|
|
arg_resolve_names = 1;
|
|
} else if (streq(optarg, "late")) {
|
|
arg_resolve_names = 0;
|
|
} else if (streq(optarg, "never")) {
|
|
arg_resolve_names = -1;
|
|
} else {
|
|
log_error("resolve-names must be early, late or never");
|
|
return 0;
|
|
}
|
|
break;
|
|
case 'h':
|
|
help();
|
|
return 0;
|
|
case 'V':
|
|
printf("%s\n", VERSION);
|
|
return 0;
|
|
case '?':
|
|
return -EINVAL;
|
|
default:
|
|
assert_not_reached("Unhandled option");
|
|
|
|
}
|
|
}
|
|
|
|
return 1;
|
|
}
|
|
|
|
int main(int argc, char *argv[]) {
|
|
struct udev *udev;
|
|
sigset_t mask;
|
|
int fd_ctrl = -1;
|
|
int fd_netlink = -1;
|
|
int fd_worker = -1;
|
|
struct epoll_event ep_ctrl = { .events = EPOLLIN };
|
|
struct epoll_event ep_inotify = { .events = EPOLLIN };
|
|
struct epoll_event ep_signal = { .events = EPOLLIN };
|
|
struct epoll_event ep_netlink = { .events = EPOLLIN };
|
|
struct epoll_event ep_worker = { .events = EPOLLIN };
|
|
struct udev_ctrl_connection *ctrl_conn = NULL;
|
|
int rc = 1, r;
|
|
|
|
udev = udev_new();
|
|
if (udev == NULL)
|
|
goto exit;
|
|
|
|
log_set_target(LOG_TARGET_AUTO);
|
|
log_parse_environment();
|
|
log_open();
|
|
|
|
r = parse_argv(argc, argv);
|
|
if (r <= 0)
|
|
goto exit;
|
|
|
|
kernel_cmdline_options(udev);
|
|
|
|
if (arg_debug)
|
|
log_set_max_level(LOG_DEBUG);
|
|
|
|
if (getuid() != 0) {
|
|
log_error("root privileges required");
|
|
goto exit;
|
|
}
|
|
|
|
r = mac_selinux_init("/dev");
|
|
if (r < 0) {
|
|
log_error_errno(r, "could not initialize labelling: %m");
|
|
goto exit;
|
|
}
|
|
|
|
/* set umask before creating any file/directory */
|
|
r = chdir("/");
|
|
if (r < 0) {
|
|
log_error_errno(errno, "could not change dir to /: %m");
|
|
goto exit;
|
|
}
|
|
|
|
umask(022);
|
|
|
|
udev_list_init(udev, &properties_list, true);
|
|
|
|
r = mkdir("/run/udev", 0755);
|
|
if (r < 0 && errno != EEXIST) {
|
|
log_error_errno(errno, "could not create /run/udev: %m");
|
|
goto exit;
|
|
}
|
|
|
|
dev_setup(NULL);
|
|
|
|
/* before opening new files, make sure std{in,out,err} fds are in a sane state */
|
|
if (arg_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 {
|
|
log_error("cannot open /dev/null");
|
|
}
|
|
}
|
|
|
|
if (systemd_fds(udev, &fd_ctrl, &fd_netlink) >= 0) {
|
|
/* get control and netlink socket 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");
|
|
rc = 3;
|
|
goto exit;
|
|
}
|
|
|
|
/* get our own cgroup, we regularly kill everything udev has left behind */
|
|
if (cg_pid_get_path(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) {
|
|
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) {
|
|
log_error("error initializing netlink socket");
|
|
rc = 3;
|
|
goto exit;
|
|
}
|
|
fd_netlink = udev_monitor_get_fd(monitor);
|
|
|
|
udev_monitor_set_receive_buffer_size(monitor, 128 * 1024 * 1024);
|
|
}
|
|
|
|
if (udev_monitor_enable_receiving(monitor) < 0) {
|
|
log_error("error binding netlink socket");
|
|
rc = 3;
|
|
goto exit;
|
|
}
|
|
|
|
if (udev_ctrl_enable_receiving(udev_ctrl) < 0) {
|
|
log_error("error binding udev control socket");
|
|
rc = 1;
|
|
goto exit;
|
|
}
|
|
|
|
log_info("starting version " VERSION);
|
|
|
|
udev_builtin_init(udev);
|
|
|
|
rules = udev_rules_new(udev, arg_resolve_names);
|
|
if (rules == NULL) {
|
|
log_error("error reading rules");
|
|
goto exit;
|
|
}
|
|
|
|
rc = udev_rules_apply_static_dev_perms(rules);
|
|
if (rc < 0)
|
|
log_error_errno(rc, "failed to apply permissions on static device nodes - %m");
|
|
|
|
if (arg_daemonize) {
|
|
pid_t pid;
|
|
|
|
pid = fork();
|
|
switch (pid) {
|
|
case 0:
|
|
break;
|
|
case -1:
|
|
log_error_errno(errno, "fork of daemon failed: %m");
|
|
rc = 4;
|
|
goto exit;
|
|
default:
|
|
rc = EXIT_SUCCESS;
|
|
goto exit_daemonize;
|
|
}
|
|
|
|
setsid();
|
|
|
|
write_string_file("/proc/self/oom_score_adj", "-1000");
|
|
} else {
|
|
sd_notify(1, "READY=1");
|
|
}
|
|
|
|
if (arg_children_max <= 0) {
|
|
cpu_set_t cpu_set;
|
|
|
|
arg_children_max = 8;
|
|
|
|
if (sched_getaffinity(0, sizeof (cpu_set), &cpu_set) == 0) {
|
|
arg_children_max += CPU_COUNT(&cpu_set) * 2;
|
|
}
|
|
}
|
|
log_debug("set children_max to %u", arg_children_max);
|
|
|
|
udev_list_node_init(&event_list);
|
|
udev_list_node_init(&worker_list);
|
|
|
|
fd_inotify = udev_watch_init(udev);
|
|
if (fd_inotify < 0) {
|
|
log_error("error initializing inotify");
|
|
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) {
|
|
log_error("error creating signalfd");
|
|
rc = 5;
|
|
goto exit;
|
|
}
|
|
|
|
/* unnamed socket from workers to the main daemon */
|
|
if (socketpair(AF_LOCAL, SOCK_DGRAM|SOCK_CLOEXEC, 0, worker_watch) < 0) {
|
|
log_error("error creating socketpair");
|
|
rc = 6;
|
|
goto exit;
|
|
}
|
|
fd_worker = worker_watch[READ_END];
|
|
|
|
ep_ctrl.data.fd = fd_ctrl;
|
|
ep_inotify.data.fd = fd_inotify;
|
|
ep_signal.data.fd = fd_signal;
|
|
ep_netlink.data.fd = fd_netlink;
|
|
ep_worker.data.fd = fd_worker;
|
|
|
|
fd_ep = epoll_create1(EPOLL_CLOEXEC);
|
|
if (fd_ep < 0) {
|
|
log_error_errno(errno, "error creating epoll fd: %m");
|
|
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_errno(errno, "fail to add fds to epoll: %m");
|
|
goto exit;
|
|
}
|
|
|
|
for (;;) {
|
|
static usec_t 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) && children == 0)
|
|
break;
|
|
|
|
/* timeout at exit for workers to finish */
|
|
timeout = 30 * MSEC_PER_SEC;
|
|
} else if (udev_list_node_is_empty(&event_list) && children == 0) {
|
|
/* 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 * MSEC_PER_SEC;
|
|
}
|
|
|
|
/* tell settle that we are busy or idle */
|
|
if (!udev_list_node_is_empty(&event_list)) {
|
|
int fd;
|
|
|
|
fd = open("/run/udev/queue", O_WRONLY|O_CREAT|O_CLOEXEC|O_TRUNC|O_NOFOLLOW, 0444);
|
|
if (fd >= 0)
|
|
close(fd);
|
|
} else {
|
|
unlink("/run/udev/queue");
|
|
}
|
|
|
|
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");
|
|
break;
|
|
}
|
|
|
|
/* kill idle workers */
|
|
if (udev_list_node_is_empty(&event_list)) {
|
|
log_debug("cleanup idle workers");
|
|
worker_kill(udev);
|
|
}
|
|
|
|
/* check for hanging events */
|
|
udev_list_node_foreach(loop, &worker_list) {
|
|
struct worker *worker = node_to_worker(loop);
|
|
usec_t ts;
|
|
|
|
if (worker->state != WORKER_RUNNING)
|
|
continue;
|
|
|
|
ts = now(CLOCK_MONOTONIC);
|
|
|
|
if ((ts - worker->event_start_usec) > arg_event_timeout_warn_usec) {
|
|
if ((ts - worker->event_start_usec) > arg_event_timeout_usec) {
|
|
log_error("worker [%u] %s timeout; kill it", worker->pid, worker->event->devpath);
|
|
kill(worker->pid, SIGKILL);
|
|
worker->state = WORKER_KILLED;
|
|
|
|
/* drop reference taken for state 'running' */
|
|
worker_unref(worker);
|
|
log_error("seq %llu '%s' killed", udev_device_get_seqnum(worker->event->dev), worker->event->devpath);
|
|
worker->event->exitcode = -64;
|
|
event_queue_delete(worker->event);
|
|
worker->event = NULL;
|
|
} else if (!worker->event_warned) {
|
|
log_warning("worker [%u] %s is taking a long time", worker->pid, worker->event->devpath);
|
|
worker->event_warned = true;
|
|
}
|
|
}
|
|
}
|
|
|
|
}
|
|
|
|
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(CLOCK_MONOTONIC) - last_usec) > 3 * USEC_PER_SEC) {
|
|
if (udev_rules_check_timestamp(rules))
|
|
reload = true;
|
|
if (udev_builtin_validate(udev))
|
|
reload = true;
|
|
|
|
last_usec = now(CLOCK_MONOTONIC);
|
|
}
|
|
|
|
/* reload requested, HUP signal received, rules changed, builtin changed */
|
|
if (reload) {
|
|
worker_kill(udev);
|
|
rules = udev_rules_unref(rules);
|
|
udev_builtin_exit(udev);
|
|
reload = false;
|
|
}
|
|
|
|
/* 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(CLOCK_MONOTONIC));
|
|
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) {
|
|
udev_builtin_init(udev);
|
|
if (rules == NULL)
|
|
rules = udev_rules_new(udev, arg_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_ctrl_cleanup(udev_ctrl);
|
|
unlink("/run/udev/queue");
|
|
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_ctrl_connection_unref(ctrl_conn);
|
|
udev_ctrl_unref(udev_ctrl);
|
|
udev_list_cleanup(&properties_list);
|
|
mac_selinux_finish();
|
|
udev_unref(udev);
|
|
log_close();
|
|
return rc;
|
|
}
|