87ac8d998f
This is the usual spelling, and a bit shorter.
1769 lines
63 KiB
C
1769 lines
63 KiB
C
/* SPDX-License-Identifier: GPL-2.0+ */
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/*
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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 <errno.h>
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#include <fcntl.h>
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#include <getopt.h>
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#include <signal.h>
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#include <stdbool.h>
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#include <stddef.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <sys/epoll.h>
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#include <sys/file.h>
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#include <sys/inotify.h>
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#include <sys/ioctl.h>
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#include <sys/mount.h>
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#include <sys/prctl.h>
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#include <sys/signalfd.h>
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#include <sys/socket.h>
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#include <sys/stat.h>
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#include <sys/time.h>
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#include <sys/wait.h>
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#include <unistd.h>
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#include "sd-daemon.h"
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#include "sd-event.h"
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#include "alloc-util.h"
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#include "cgroup-util.h"
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#include "cpu-set-util.h"
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#include "dev-setup.h"
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#include "fd-util.h"
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#include "fileio.h"
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#include "format-util.h"
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#include "fs-util.h"
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#include "hashmap.h"
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#include "io-util.h"
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#include "list.h"
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#include "netlink-util.h"
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#include "parse-util.h"
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#include "proc-cmdline.h"
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#include "process-util.h"
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#include "selinux-util.h"
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#include "signal-util.h"
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#include "socket-util.h"
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#include "string-util.h"
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#include "terminal-util.h"
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#include "udev-util.h"
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#include "udev.h"
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#include "user-util.h"
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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 unsigned 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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typedef struct Manager {
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struct udev *udev;
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sd_event *event;
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Hashmap *workers;
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LIST_HEAD(struct event, events);
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const char *cgroup;
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pid_t pid; /* the process that originally allocated the manager object */
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struct udev_rules *rules;
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struct udev_list properties;
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struct udev_monitor *monitor;
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struct udev_ctrl *ctrl;
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struct udev_ctrl_connection *ctrl_conn_blocking;
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int fd_inotify;
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int worker_watch[2];
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sd_event_source *ctrl_event;
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sd_event_source *uevent_event;
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sd_event_source *inotify_event;
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usec_t last_usec;
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bool stop_exec_queue:1;
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bool exit:1;
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} Manager;
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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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LIST_FIELDS(struct event, event);
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Manager *manager;
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struct udev *udev;
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struct udev_device *dev;
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struct udev_device *dev_kernel;
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struct worker *worker;
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enum event_state state;
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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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sd_event_source *timeout_warning;
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sd_event_source *timeout;
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};
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static void event_queue_cleanup(Manager *manager, 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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Manager *manager;
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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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};
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/* passed from worker to main process */
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struct worker_message {
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};
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static void event_free(struct event *event) {
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int r;
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if (!event)
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return;
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assert(event->manager);
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LIST_REMOVE(event, event->manager->events, event);
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udev_device_unref(event->dev);
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udev_device_unref(event->dev_kernel);
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sd_event_source_unref(event->timeout_warning);
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sd_event_source_unref(event->timeout);
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if (event->worker)
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event->worker->event = NULL;
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if (LIST_IS_EMPTY(event->manager->events)) {
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/* only clean up the queue from the process that created it */
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if (event->manager->pid == getpid_cached()) {
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r = unlink("/run/udev/queue");
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if (r < 0)
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log_warning_errno(errno, "could not unlink /run/udev/queue: %m");
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}
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}
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free(event);
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}
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static void worker_free(struct worker *worker) {
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if (!worker)
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return;
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assert(worker->manager);
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hashmap_remove(worker->manager->workers, PID_TO_PTR(worker->pid));
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udev_monitor_unref(worker->monitor);
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event_free(worker->event);
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free(worker);
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}
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static void manager_workers_free(Manager *manager) {
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struct worker *worker;
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Iterator i;
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assert(manager);
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HASHMAP_FOREACH(worker, manager->workers, i)
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worker_free(worker);
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manager->workers = hashmap_free(manager->workers);
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}
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static int worker_new(struct worker **ret, Manager *manager, struct udev_monitor *worker_monitor, pid_t pid) {
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_cleanup_free_ struct worker *worker = NULL;
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int r;
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assert(ret);
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assert(manager);
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assert(worker_monitor);
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assert(pid > 1);
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worker = new0(struct worker, 1);
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if (!worker)
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return -ENOMEM;
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worker->refcount = 1;
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worker->manager = manager;
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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 = udev_monitor_ref(worker_monitor);
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worker->pid = pid;
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r = hashmap_ensure_allocated(&manager->workers, NULL);
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if (r < 0)
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return r;
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r = hashmap_put(manager->workers, PID_TO_PTR(pid), worker);
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if (r < 0)
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return r;
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*ret = worker;
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worker = NULL;
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return 0;
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}
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static int on_event_timeout(sd_event_source *s, uint64_t usec, void *userdata) {
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struct event *event = userdata;
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assert(event);
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assert(event->worker);
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kill_and_sigcont(event->worker->pid, SIGKILL);
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event->worker->state = WORKER_KILLED;
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log_error("seq %llu '%s' killed", udev_device_get_seqnum(event->dev), event->devpath);
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return 1;
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}
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static int on_event_timeout_warning(sd_event_source *s, uint64_t usec, void *userdata) {
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struct event *event = userdata;
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assert(event);
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log_warning("seq %llu '%s' is taking a long time", udev_device_get_seqnum(event->dev), event->devpath);
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return 1;
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}
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static void worker_attach_event(struct worker *worker, struct event *event) {
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sd_event *e;
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uint64_t usec;
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assert(worker);
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assert(worker->manager);
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assert(event);
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assert(!event->worker);
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assert(!worker->event);
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worker->state = WORKER_RUNNING;
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worker->event = event;
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event->state = EVENT_RUNNING;
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event->worker = worker;
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e = worker->manager->event;
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assert_se(sd_event_now(e, CLOCK_MONOTONIC, &usec) >= 0);
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(void) sd_event_add_time(e, &event->timeout_warning, CLOCK_MONOTONIC,
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usec + arg_event_timeout_warn_usec, USEC_PER_SEC, on_event_timeout_warning, event);
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(void) sd_event_add_time(e, &event->timeout, CLOCK_MONOTONIC,
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usec + arg_event_timeout_usec, USEC_PER_SEC, on_event_timeout, event);
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}
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static void manager_free(Manager *manager) {
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if (!manager)
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return;
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udev_builtin_exit(manager->udev);
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sd_event_source_unref(manager->ctrl_event);
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sd_event_source_unref(manager->uevent_event);
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sd_event_source_unref(manager->inotify_event);
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udev_unref(manager->udev);
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sd_event_unref(manager->event);
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manager_workers_free(manager);
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event_queue_cleanup(manager, EVENT_UNDEF);
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udev_monitor_unref(manager->monitor);
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udev_ctrl_unref(manager->ctrl);
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udev_ctrl_connection_unref(manager->ctrl_conn_blocking);
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udev_list_cleanup(&manager->properties);
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udev_rules_unref(manager->rules);
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safe_close(manager->fd_inotify);
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safe_close_pair(manager->worker_watch);
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free(manager);
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}
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DEFINE_TRIVIAL_CLEANUP_FUNC(Manager*, manager_free);
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static int worker_send_message(int fd) {
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struct worker_message message = {};
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return loop_write(fd, &message, sizeof(message), false);
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}
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static void worker_spawn(Manager *manager, struct event *event) {
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struct udev *udev = event->udev;
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_cleanup_udev_monitor_unref_ struct udev_monitor *worker_monitor = NULL;
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pid_t pid;
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int r = 0;
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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, manager->monitor);
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r = udev_monitor_enable_receiving(worker_monitor);
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if (r < 0)
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log_error_errno(r, "worker: could not enable receiving of device: %m");
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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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_cleanup_(sd_netlink_unrefp) sd_netlink *rtnl = NULL;
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int fd_monitor;
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_cleanup_close_ int fd_signal = -1, fd_ep = -1;
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struct epoll_event ep_signal = { .events = EPOLLIN };
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struct epoll_event ep_monitor = { .events = EPOLLIN };
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sigset_t mask;
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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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unsetenv("NOTIFY_SOCKET");
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manager_workers_free(manager);
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event_queue_cleanup(manager, EVENT_UNDEF);
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manager->monitor = udev_monitor_unref(manager->monitor);
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manager->ctrl_conn_blocking = udev_ctrl_connection_unref(manager->ctrl_conn_blocking);
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manager->ctrl = udev_ctrl_unref(manager->ctrl);
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manager->worker_watch[READ_END] = safe_close(manager->worker_watch[READ_END]);
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manager->ctrl_event = sd_event_source_unref(manager->ctrl_event);
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manager->uevent_event = sd_event_source_unref(manager->uevent_event);
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manager->inotify_event = sd_event_source_unref(manager->inotify_event);
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manager->event = sd_event_unref(manager->event);
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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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r = log_error_errno(errno, "error creating signalfd %m");
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goto out;
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}
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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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ep_monitor.data.fd = fd_monitor;
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fd_ep = epoll_create1(EPOLL_CLOEXEC);
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if (fd_ep < 0) {
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r = log_error_errno(errno, "error creating epoll fd: %m");
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goto out;
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}
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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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r = log_error_errno(errno, "fail to add fds to epoll: %m");
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goto out;
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}
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/* Request TERM signal if parent exits.
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Ignore error, not much we can do in that case. */
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(void) 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", 0);
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for (;;) {
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struct udev_event *udev_event;
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int fd_lock = -1;
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assert(dev);
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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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r = -ENOMEM;
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goto out;
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}
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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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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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|
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/* needed for renaming netifs */
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udev_event->rtnl = rtnl;
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|
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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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&manager->properties,
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manager->rules);
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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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if (udev_event->rtnl)
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/* in case rtnl was initialized */
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rtnl = sd_netlink_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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/* 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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log_debug("seq %llu processed", udev_device_get_seqnum(dev));
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/* send udevd the result of the event execution */
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r = worker_send_message(manager->worker_watch[WRITE_END]);
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if (r < 0)
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log_error_errno(r, "failed to send result of seq %llu to main daemon: %m",
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udev_device_get_seqnum(dev));
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udev_device_unref(dev);
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dev = NULL;
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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);
|
|
if (fdcount < 0) {
|
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if (errno == EINTR)
|
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continue;
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r = log_error_errno(errno, "failed to poll: %m");
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goto out;
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}
|
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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;
|
|
ssize_t size;
|
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|
|
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);
|
|
manager_free(manager);
|
|
log_close();
|
|
_exit(r < 0 ? EXIT_FAILURE : EXIT_SUCCESS);
|
|
}
|
|
case -1:
|
|
event->state = EVENT_QUEUED;
|
|
log_error_errno(errno, "fork of child failed: %m");
|
|
break;
|
|
default:
|
|
{
|
|
struct worker *worker;
|
|
|
|
r = worker_new(&worker, manager, worker_monitor, pid);
|
|
if (r < 0)
|
|
return;
|
|
|
|
worker_attach_event(worker, event);
|
|
|
|
log_debug("seq %llu forked new worker ["PID_FMT"]", udev_device_get_seqnum(event->dev), pid);
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
static void event_run(Manager *manager, struct event *event) {
|
|
struct worker *worker;
|
|
Iterator i;
|
|
|
|
assert(manager);
|
|
assert(event);
|
|
|
|
HASHMAP_FOREACH(worker, manager->workers, i) {
|
|
ssize_t count;
|
|
|
|
if (worker->state != WORKER_IDLE)
|
|
continue;
|
|
|
|
count = udev_monitor_send_device(manager->monitor, worker->monitor, event->dev);
|
|
if (count < 0) {
|
|
log_error_errno(errno, "worker ["PID_FMT"] did not accept message %zi (%m), kill it",
|
|
worker->pid, count);
|
|
kill(worker->pid, SIGKILL);
|
|
worker->state = WORKER_KILLED;
|
|
continue;
|
|
}
|
|
worker_attach_event(worker, event);
|
|
return;
|
|
}
|
|
|
|
if (hashmap_size(manager->workers) >= arg_children_max) {
|
|
if (arg_children_max > 1)
|
|
log_debug("maximum number (%i) of children reached", hashmap_size(manager->workers));
|
|
return;
|
|
}
|
|
|
|
/* start new worker and pass initial device */
|
|
worker_spawn(manager, event);
|
|
}
|
|
|
|
static int event_queue_insert(Manager *manager, struct udev_device *dev) {
|
|
struct event *event;
|
|
int r;
|
|
|
|
assert(manager);
|
|
assert(dev);
|
|
|
|
/* only one process can add events to the queue */
|
|
if (manager->pid == 0)
|
|
manager->pid = getpid_cached();
|
|
|
|
assert(manager->pid == getpid_cached());
|
|
|
|
event = new0(struct event, 1);
|
|
if (!event)
|
|
return -ENOMEM;
|
|
|
|
event->udev = udev_device_get_udev(dev);
|
|
event->manager = manager;
|
|
event->dev = dev;
|
|
event->dev_kernel = udev_device_shallow_clone(dev);
|
|
udev_device_copy_properties(event->dev_kernel, 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;
|
|
|
|
if (LIST_IS_EMPTY(manager->events)) {
|
|
r = touch("/run/udev/queue");
|
|
if (r < 0)
|
|
log_warning_errno(r, "could not touch /run/udev/queue: %m");
|
|
}
|
|
|
|
LIST_APPEND(event, manager->events, event);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void manager_kill_workers(Manager *manager) {
|
|
struct worker *worker;
|
|
Iterator i;
|
|
|
|
assert(manager);
|
|
|
|
HASHMAP_FOREACH(worker, manager->workers, i) {
|
|
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(Manager *manager, struct event *event) {
|
|
struct event *loop_event;
|
|
size_t common;
|
|
|
|
/* check if queue contains events we depend on */
|
|
LIST_FOREACH(event, loop_event, manager->events) {
|
|
/* we already found a later event, earlier cannot 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 int on_exit_timeout(sd_event_source *s, uint64_t usec, void *userdata) {
|
|
Manager *manager = userdata;
|
|
|
|
assert(manager);
|
|
|
|
log_error_errno(ETIMEDOUT, "giving up waiting for workers to finish");
|
|
|
|
sd_event_exit(manager->event, -ETIMEDOUT);
|
|
|
|
return 1;
|
|
}
|
|
|
|
static void manager_exit(Manager *manager) {
|
|
uint64_t usec;
|
|
int r;
|
|
|
|
assert(manager);
|
|
|
|
manager->exit = true;
|
|
|
|
sd_notify(false,
|
|
"STOPPING=1\n"
|
|
"STATUS=Starting shutdown...");
|
|
|
|
/* close sources of new events and discard buffered events */
|
|
manager->ctrl_event = sd_event_source_unref(manager->ctrl_event);
|
|
manager->ctrl = udev_ctrl_unref(manager->ctrl);
|
|
|
|
manager->inotify_event = sd_event_source_unref(manager->inotify_event);
|
|
manager->fd_inotify = safe_close(manager->fd_inotify);
|
|
|
|
manager->uevent_event = sd_event_source_unref(manager->uevent_event);
|
|
manager->monitor = udev_monitor_unref(manager->monitor);
|
|
|
|
/* discard queued events and kill workers */
|
|
event_queue_cleanup(manager, EVENT_QUEUED);
|
|
manager_kill_workers(manager);
|
|
|
|
assert_se(sd_event_now(manager->event, CLOCK_MONOTONIC, &usec) >= 0);
|
|
|
|
r = sd_event_add_time(manager->event, NULL, CLOCK_MONOTONIC,
|
|
usec + 30 * USEC_PER_SEC, USEC_PER_SEC, on_exit_timeout, manager);
|
|
if (r < 0)
|
|
return;
|
|
}
|
|
|
|
/* reload requested, HUP signal received, rules changed, builtin changed */
|
|
static void manager_reload(Manager *manager) {
|
|
|
|
assert(manager);
|
|
|
|
sd_notify(false,
|
|
"RELOADING=1\n"
|
|
"STATUS=Flushing configuration...");
|
|
|
|
manager_kill_workers(manager);
|
|
manager->rules = udev_rules_unref(manager->rules);
|
|
udev_builtin_exit(manager->udev);
|
|
|
|
sd_notifyf(false,
|
|
"READY=1\n"
|
|
"STATUS=Processing with %u children at max", arg_children_max);
|
|
}
|
|
|
|
static void event_queue_start(Manager *manager) {
|
|
struct event *event;
|
|
usec_t usec;
|
|
|
|
assert(manager);
|
|
|
|
if (LIST_IS_EMPTY(manager->events) ||
|
|
manager->exit || manager->stop_exec_queue)
|
|
return;
|
|
|
|
assert_se(sd_event_now(manager->event, CLOCK_MONOTONIC, &usec) >= 0);
|
|
/* check for changed config, every 3 seconds at most */
|
|
if (manager->last_usec == 0 ||
|
|
(usec - manager->last_usec) > 3 * USEC_PER_SEC) {
|
|
if (udev_rules_check_timestamp(manager->rules) ||
|
|
udev_builtin_validate(manager->udev))
|
|
manager_reload(manager);
|
|
|
|
manager->last_usec = usec;
|
|
}
|
|
|
|
udev_builtin_init(manager->udev);
|
|
|
|
if (!manager->rules) {
|
|
manager->rules = udev_rules_new(manager->udev, arg_resolve_names);
|
|
if (!manager->rules)
|
|
return;
|
|
}
|
|
|
|
LIST_FOREACH(event,event,manager->events) {
|
|
if (event->state != EVENT_QUEUED)
|
|
continue;
|
|
|
|
/* do not start event if parent or child event is still running */
|
|
if (is_devpath_busy(manager, event))
|
|
continue;
|
|
|
|
event_run(manager, event);
|
|
}
|
|
}
|
|
|
|
static void event_queue_cleanup(Manager *manager, enum event_state match_type) {
|
|
struct event *event, *tmp;
|
|
|
|
LIST_FOREACH_SAFE(event, event, tmp, manager->events) {
|
|
if (match_type != EVENT_UNDEF && match_type != event->state)
|
|
continue;
|
|
|
|
event_free(event);
|
|
}
|
|
}
|
|
|
|
static int on_worker(sd_event_source *s, int fd, uint32_t revents, void *userdata) {
|
|
Manager *manager = userdata;
|
|
|
|
assert(manager);
|
|
|
|
for (;;) {
|
|
struct worker_message msg;
|
|
struct iovec iovec = {
|
|
.iov_base = &msg,
|
|
.iov_len = sizeof(msg),
|
|
};
|
|
union {
|
|
struct cmsghdr cmsghdr;
|
|
uint8_t buf[CMSG_SPACE(sizeof(struct ucred))];
|
|
} control = {};
|
|
struct msghdr msghdr = {
|
|
.msg_iov = &iovec,
|
|
.msg_iovlen = 1,
|
|
.msg_control = &control,
|
|
.msg_controllen = sizeof(control),
|
|
};
|
|
struct cmsghdr *cmsg;
|
|
ssize_t size;
|
|
struct ucred *ucred = NULL;
|
|
struct worker *worker;
|
|
|
|
size = recvmsg(fd, &msghdr, MSG_DONTWAIT);
|
|
if (size < 0) {
|
|
if (errno == EINTR)
|
|
continue;
|
|
else if (errno == EAGAIN)
|
|
/* nothing more to read */
|
|
break;
|
|
|
|
return log_error_errno(errno, "failed to receive message: %m");
|
|
} else if (size != sizeof(struct worker_message)) {
|
|
log_warning_errno(EIO, "ignoring worker message with invalid size %zi bytes", size);
|
|
continue;
|
|
}
|
|
|
|
CMSG_FOREACH(cmsg, &msghdr) {
|
|
if (cmsg->cmsg_level == SOL_SOCKET &&
|
|
cmsg->cmsg_type == SCM_CREDENTIALS &&
|
|
cmsg->cmsg_len == CMSG_LEN(sizeof(struct ucred)))
|
|
ucred = (struct ucred*) CMSG_DATA(cmsg);
|
|
}
|
|
|
|
if (!ucred || ucred->pid <= 0) {
|
|
log_warning_errno(EIO, "ignoring worker message without valid PID");
|
|
continue;
|
|
}
|
|
|
|
/* lookup worker who sent the signal */
|
|
worker = hashmap_get(manager->workers, PID_TO_PTR(ucred->pid));
|
|
if (!worker) {
|
|
log_debug("worker ["PID_FMT"] returned, but is no longer tracked", ucred->pid);
|
|
continue;
|
|
}
|
|
|
|
if (worker->state != WORKER_KILLED)
|
|
worker->state = WORKER_IDLE;
|
|
|
|
/* worker returned */
|
|
event_free(worker->event);
|
|
}
|
|
|
|
/* we have free workers, try to schedule events */
|
|
event_queue_start(manager);
|
|
|
|
return 1;
|
|
}
|
|
|
|
static int on_uevent(sd_event_source *s, int fd, uint32_t revents, void *userdata) {
|
|
Manager *manager = userdata;
|
|
struct udev_device *dev;
|
|
int r;
|
|
|
|
assert(manager);
|
|
|
|
dev = udev_monitor_receive_device(manager->monitor);
|
|
if (dev) {
|
|
udev_device_ensure_usec_initialized(dev, NULL);
|
|
r = event_queue_insert(manager, dev);
|
|
if (r < 0)
|
|
udev_device_unref(dev);
|
|
else
|
|
/* we have fresh events, try to schedule them */
|
|
event_queue_start(manager);
|
|
}
|
|
|
|
return 1;
|
|
}
|
|
|
|
/* receive the udevd message from userspace */
|
|
static int on_ctrl_msg(sd_event_source *s, int fd, uint32_t revents, void *userdata) {
|
|
Manager *manager = userdata;
|
|
_cleanup_udev_ctrl_connection_unref_ struct udev_ctrl_connection *ctrl_conn = NULL;
|
|
_cleanup_udev_ctrl_msg_unref_ struct udev_ctrl_msg *ctrl_msg = NULL;
|
|
const char *str;
|
|
int i;
|
|
|
|
assert(manager);
|
|
|
|
ctrl_conn = udev_ctrl_get_connection(manager->ctrl);
|
|
if (!ctrl_conn)
|
|
return 1;
|
|
|
|
ctrl_msg = udev_ctrl_receive_msg(ctrl_conn);
|
|
if (!ctrl_msg)
|
|
return 1;
|
|
|
|
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);
|
|
manager_kill_workers(manager);
|
|
}
|
|
|
|
if (udev_ctrl_get_stop_exec_queue(ctrl_msg) > 0) {
|
|
log_debug("udevd message (STOP_EXEC_QUEUE) received");
|
|
manager->stop_exec_queue = true;
|
|
}
|
|
|
|
if (udev_ctrl_get_start_exec_queue(ctrl_msg) > 0) {
|
|
log_debug("udevd message (START_EXEC_QUEUE) received");
|
|
manager->stop_exec_queue = false;
|
|
event_queue_start(manager);
|
|
}
|
|
|
|
if (udev_ctrl_get_reload(ctrl_msg) > 0) {
|
|
log_debug("udevd message (RELOAD) received");
|
|
manager_reload(manager);
|
|
}
|
|
|
|
str = udev_ctrl_get_set_env(ctrl_msg);
|
|
if (str != NULL) {
|
|
_cleanup_free_ char *key = NULL;
|
|
|
|
key = strdup(str);
|
|
if (key) {
|
|
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(&manager->properties, key, NULL);
|
|
} else {
|
|
log_debug("udevd message (ENV) received, set '%s=%s'", key, val);
|
|
udev_list_entry_add(&manager->properties, key, val);
|
|
}
|
|
} else
|
|
log_error("wrong key format '%s'", key);
|
|
}
|
|
manager_kill_workers(manager);
|
|
}
|
|
|
|
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;
|
|
|
|
(void) sd_notifyf(false,
|
|
"READY=1\n"
|
|
"STATUS=Processing with %u children at max", arg_children_max);
|
|
}
|
|
|
|
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");
|
|
manager_exit(manager);
|
|
/* keep reference to block the client until we exit
|
|
TODO: deal with several blocking exit requests */
|
|
manager->ctrl_conn_blocking = udev_ctrl_connection_ref(ctrl_conn);
|
|
}
|
|
|
|
return 1;
|
|
}
|
|
|
|
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", WRITE_STRING_FILE_CREATE);
|
|
|
|
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", WRITE_STRING_FILE_CREATE);
|
|
}
|
|
|
|
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", WRITE_STRING_FILE_CREATE);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int on_inotify(sd_event_source *s, int fd, uint32_t revents, void *userdata) {
|
|
Manager *manager = userdata;
|
|
union inotify_event_buffer buffer;
|
|
struct inotify_event *e;
|
|
ssize_t l;
|
|
|
|
assert(manager);
|
|
|
|
l = read(fd, &buffer, sizeof(buffer));
|
|
if (l < 0) {
|
|
if (IN_SET(errno, EAGAIN, EINTR))
|
|
return 1;
|
|
|
|
return log_error_errno(errno, "Failed to read inotify fd: %m");
|
|
}
|
|
|
|
FOREACH_INOTIFY_EVENT(e, buffer, l) {
|
|
_cleanup_udev_device_unref_ struct udev_device *dev = NULL;
|
|
|
|
dev = udev_watch_lookup(manager->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);
|
|
|
|
/* settle might be waiting on us to determine the queue
|
|
* state. If we just handled an inotify event, we might have
|
|
* generated a "change" event, but we won't have queued up
|
|
* the resultant uevent yet. Do that.
|
|
*/
|
|
on_uevent(NULL, -1, 0, manager);
|
|
} else if (e->mask & IN_IGNORED)
|
|
udev_watch_end(manager->udev, dev);
|
|
}
|
|
|
|
return 1;
|
|
}
|
|
|
|
static int on_sigterm(sd_event_source *s, const struct signalfd_siginfo *si, void *userdata) {
|
|
Manager *manager = userdata;
|
|
|
|
assert(manager);
|
|
|
|
manager_exit(manager);
|
|
|
|
return 1;
|
|
}
|
|
|
|
static int on_sighup(sd_event_source *s, const struct signalfd_siginfo *si, void *userdata) {
|
|
Manager *manager = userdata;
|
|
|
|
assert(manager);
|
|
|
|
manager_reload(manager);
|
|
|
|
return 1;
|
|
}
|
|
|
|
static int on_sigchld(sd_event_source *s, const struct signalfd_siginfo *si, void *userdata) {
|
|
Manager *manager = userdata;
|
|
|
|
assert(manager);
|
|
|
|
for (;;) {
|
|
pid_t pid;
|
|
int status;
|
|
struct worker *worker;
|
|
|
|
pid = waitpid(-1, &status, WNOHANG);
|
|
if (pid <= 0)
|
|
break;
|
|
|
|
worker = hashmap_get(manager->workers, PID_TO_PTR(pid));
|
|
if (!worker) {
|
|
log_warning("worker ["PID_FMT"] is unknown, ignoring", pid);
|
|
continue;
|
|
}
|
|
|
|
if (WIFEXITED(status)) {
|
|
if (WEXITSTATUS(status) == 0)
|
|
log_debug("worker ["PID_FMT"] exited", pid);
|
|
else
|
|
log_warning("worker ["PID_FMT"] exited with return code %i", pid, WEXITSTATUS(status));
|
|
} else if (WIFSIGNALED(status)) {
|
|
log_warning("worker ["PID_FMT"] terminated by signal %i (%s)", pid, WTERMSIG(status), signal_to_string(WTERMSIG(status)));
|
|
} else if (WIFSTOPPED(status)) {
|
|
log_info("worker ["PID_FMT"] stopped", pid);
|
|
continue;
|
|
} else if (WIFCONTINUED(status)) {
|
|
log_info("worker ["PID_FMT"] continued", pid);
|
|
continue;
|
|
} else
|
|
log_warning("worker ["PID_FMT"] exit with status 0x%04x", pid, status);
|
|
|
|
if (!WIFEXITED(status) || WEXITSTATUS(status) != 0) {
|
|
if (worker->event) {
|
|
log_error("worker ["PID_FMT"] failed while handling '%s'", pid, worker->event->devpath);
|
|
/* delete state from disk */
|
|
udev_device_delete_db(worker->event->dev);
|
|
udev_device_tag_index(worker->event->dev, NULL, false);
|
|
/* forward kernel event without amending it */
|
|
udev_monitor_send_device(manager->monitor, NULL, worker->event->dev_kernel);
|
|
}
|
|
}
|
|
|
|
worker_free(worker);
|
|
}
|
|
|
|
/* we can start new workers, try to schedule events */
|
|
event_queue_start(manager);
|
|
|
|
return 1;
|
|
}
|
|
|
|
static int on_post(sd_event_source *s, void *userdata) {
|
|
Manager *manager = userdata;
|
|
int r;
|
|
|
|
assert(manager);
|
|
|
|
if (LIST_IS_EMPTY(manager->events)) {
|
|
/* no pending events */
|
|
if (!hashmap_isempty(manager->workers)) {
|
|
/* there are idle workers */
|
|
log_debug("cleanup idle workers");
|
|
manager_kill_workers(manager);
|
|
} else {
|
|
/* we are idle */
|
|
if (manager->exit) {
|
|
r = sd_event_exit(manager->event, 0);
|
|
if (r < 0)
|
|
return r;
|
|
} else if (manager->cgroup)
|
|
/* cleanup possible left-over processes in our cgroup */
|
|
cg_kill(SYSTEMD_CGROUP_CONTROLLER, manager->cgroup, SIGKILL, CGROUP_IGNORE_SELF, NULL, NULL, NULL);
|
|
}
|
|
}
|
|
|
|
return 1;
|
|
}
|
|
|
|
static int listen_fds(int *rctrl, int *rnetlink) {
|
|
_cleanup_udev_unref_ struct udev *udev = NULL;
|
|
int ctrl_fd = -1, netlink_fd = -1;
|
|
int fd, n, r;
|
|
|
|
assert(rctrl);
|
|
assert(rnetlink);
|
|
|
|
n = sd_listen_fds(true);
|
|
if (n < 0)
|
|
return n;
|
|
|
|
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_fd >= 0)
|
|
return -EINVAL;
|
|
ctrl_fd = fd;
|
|
continue;
|
|
}
|
|
|
|
if (sd_is_socket(fd, AF_NETLINK, SOCK_RAW, -1)) {
|
|
if (netlink_fd >= 0)
|
|
return -EINVAL;
|
|
netlink_fd = fd;
|
|
continue;
|
|
}
|
|
|
|
return -EINVAL;
|
|
}
|
|
|
|
if (ctrl_fd < 0) {
|
|
_cleanup_udev_ctrl_unref_ struct udev_ctrl *ctrl = NULL;
|
|
|
|
udev = udev_new();
|
|
if (!udev)
|
|
return -ENOMEM;
|
|
|
|
ctrl = udev_ctrl_new(udev);
|
|
if (!ctrl)
|
|
return log_error_errno(EINVAL, "error initializing udev control socket");
|
|
|
|
r = udev_ctrl_enable_receiving(ctrl);
|
|
if (r < 0)
|
|
return log_error_errno(EINVAL, "error binding udev control socket");
|
|
|
|
fd = udev_ctrl_get_fd(ctrl);
|
|
if (fd < 0)
|
|
return log_error_errno(EIO, "could not get ctrl fd");
|
|
|
|
ctrl_fd = fcntl(fd, F_DUPFD_CLOEXEC, 3);
|
|
if (ctrl_fd < 0)
|
|
return log_error_errno(errno, "could not dup ctrl fd: %m");
|
|
}
|
|
|
|
if (netlink_fd < 0) {
|
|
_cleanup_udev_monitor_unref_ struct udev_monitor *monitor = NULL;
|
|
|
|
if (!udev) {
|
|
udev = udev_new();
|
|
if (!udev)
|
|
return -ENOMEM;
|
|
}
|
|
|
|
monitor = udev_monitor_new_from_netlink(udev, "kernel");
|
|
if (!monitor)
|
|
return log_error_errno(EINVAL, "error initializing netlink socket");
|
|
|
|
(void) udev_monitor_set_receive_buffer_size(monitor, 128 * 1024 * 1024);
|
|
|
|
r = udev_monitor_enable_receiving(monitor);
|
|
if (r < 0)
|
|
return log_error_errno(EINVAL, "error binding netlink socket");
|
|
|
|
fd = udev_monitor_get_fd(monitor);
|
|
if (fd < 0)
|
|
return log_error_errno(netlink_fd, "could not get uevent fd: %m");
|
|
|
|
netlink_fd = fcntl(fd, F_DUPFD_CLOEXEC, 3);
|
|
if (netlink_fd < 0)
|
|
return log_error_errno(errno, "could not dup netlink fd: %m");
|
|
}
|
|
|
|
*rctrl = ctrl_fd;
|
|
*rnetlink = netlink_fd;
|
|
|
|
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
|
|
* udev.event_timeout=<number of seconds> seconds to wait before terminating an event
|
|
*/
|
|
static int parse_proc_cmdline_item(const char *key, const char *value, void *data) {
|
|
int r = 0;
|
|
|
|
assert(key);
|
|
|
|
if (!value)
|
|
return 0;
|
|
|
|
if (proc_cmdline_key_streq(key, "udev.log_priority")) {
|
|
|
|
if (proc_cmdline_value_missing(key, value))
|
|
return 0;
|
|
|
|
r = util_log_priority(value);
|
|
if (r >= 0)
|
|
log_set_max_level(r);
|
|
|
|
} else if (proc_cmdline_key_streq(key, "udev.event_timeout")) {
|
|
|
|
if (proc_cmdline_value_missing(key, value))
|
|
return 0;
|
|
|
|
r = safe_atou64(value, &arg_event_timeout_usec);
|
|
if (r >= 0) {
|
|
arg_event_timeout_usec *= USEC_PER_SEC;
|
|
arg_event_timeout_warn_usec = (arg_event_timeout_usec / 3) ? : 1;
|
|
}
|
|
|
|
} else if (proc_cmdline_key_streq(key, "udev.children_max")) {
|
|
|
|
if (proc_cmdline_value_missing(key, value))
|
|
return 0;
|
|
|
|
r = safe_atou(value, &arg_children_max);
|
|
|
|
} else if (proc_cmdline_key_streq(key, "udev.exec_delay")) {
|
|
|
|
if (proc_cmdline_value_missing(key, value))
|
|
return 0;
|
|
|
|
r = safe_atoi(value, &arg_exec_delay);
|
|
|
|
} else if (startswith(key, "udev."))
|
|
log_warning("Unknown udev kernel command line option \"%s\"", key);
|
|
|
|
if (r < 0)
|
|
log_warning_errno(r, "Failed to parse \"%s=%s\", ignoring: %m", key, value);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void help(void) {
|
|
printf("%s [OPTIONS...]\n\n"
|
|
"Manages devices.\n\n"
|
|
" -h --help Print this message\n"
|
|
" -V --version Print version of the program\n"
|
|
" -d --daemon Detach and run in the background\n"
|
|
" -D --debug Enable debug output\n"
|
|
" -c --children-max=INT Set maximum number of workers\n"
|
|
" -e --exec-delay=SECONDS Seconds to wait before executing RUN=\n"
|
|
" -t --event-timeout=SECONDS Seconds to wait before terminating an event\n"
|
|
" -N --resolve-names=early|late|never\n"
|
|
" When to resolve users and groups\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:Dt:N:hV", options, NULL)) >= 0) {
|
|
int r;
|
|
|
|
switch (c) {
|
|
|
|
case 'd':
|
|
arg_daemonize = true;
|
|
break;
|
|
case 'c':
|
|
r = safe_atou(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", PACKAGE_VERSION);
|
|
return 0;
|
|
case '?':
|
|
return -EINVAL;
|
|
default:
|
|
assert_not_reached("Unhandled option");
|
|
|
|
}
|
|
}
|
|
|
|
return 1;
|
|
}
|
|
|
|
static int manager_new(Manager **ret, int fd_ctrl, int fd_uevent, const char *cgroup) {
|
|
_cleanup_(manager_freep) Manager *manager = NULL;
|
|
int r, fd_worker, one = 1;
|
|
|
|
assert(ret);
|
|
assert(fd_ctrl >= 0);
|
|
assert(fd_uevent >= 0);
|
|
|
|
manager = new0(Manager, 1);
|
|
if (!manager)
|
|
return log_oom();
|
|
|
|
manager->fd_inotify = -1;
|
|
manager->worker_watch[WRITE_END] = -1;
|
|
manager->worker_watch[READ_END] = -1;
|
|
|
|
manager->udev = udev_new();
|
|
if (!manager->udev)
|
|
return log_error_errno(errno, "could not allocate udev context: %m");
|
|
|
|
udev_builtin_init(manager->udev);
|
|
|
|
manager->rules = udev_rules_new(manager->udev, arg_resolve_names);
|
|
if (!manager->rules)
|
|
return log_error_errno(ENOMEM, "error reading rules");
|
|
|
|
LIST_HEAD_INIT(manager->events);
|
|
udev_list_init(manager->udev, &manager->properties, true);
|
|
|
|
manager->cgroup = cgroup;
|
|
|
|
manager->ctrl = udev_ctrl_new_from_fd(manager->udev, fd_ctrl);
|
|
if (!manager->ctrl)
|
|
return log_error_errno(EINVAL, "error taking over udev control socket");
|
|
|
|
manager->monitor = udev_monitor_new_from_netlink_fd(manager->udev, "kernel", fd_uevent);
|
|
if (!manager->monitor)
|
|
return log_error_errno(EINVAL, "error taking over netlink socket");
|
|
|
|
/* unnamed socket from workers to the main daemon */
|
|
r = socketpair(AF_LOCAL, SOCK_DGRAM|SOCK_CLOEXEC, 0, manager->worker_watch);
|
|
if (r < 0)
|
|
return log_error_errno(errno, "error creating socketpair: %m");
|
|
|
|
fd_worker = manager->worker_watch[READ_END];
|
|
|
|
r = setsockopt(fd_worker, SOL_SOCKET, SO_PASSCRED, &one, sizeof(one));
|
|
if (r < 0)
|
|
return log_error_errno(errno, "could not enable SO_PASSCRED: %m");
|
|
|
|
manager->fd_inotify = udev_watch_init(manager->udev);
|
|
if (manager->fd_inotify < 0)
|
|
return log_error_errno(ENOMEM, "error initializing inotify");
|
|
|
|
udev_watch_restore(manager->udev);
|
|
|
|
/* block and listen to all signals on signalfd */
|
|
assert_se(sigprocmask_many(SIG_BLOCK, NULL, SIGTERM, SIGINT, SIGHUP, SIGCHLD, -1) >= 0);
|
|
|
|
r = sd_event_default(&manager->event);
|
|
if (r < 0)
|
|
return log_error_errno(r, "could not allocate event loop: %m");
|
|
|
|
r = sd_event_add_signal(manager->event, NULL, SIGINT, on_sigterm, manager);
|
|
if (r < 0)
|
|
return log_error_errno(r, "error creating sigint event source: %m");
|
|
|
|
r = sd_event_add_signal(manager->event, NULL, SIGTERM, on_sigterm, manager);
|
|
if (r < 0)
|
|
return log_error_errno(r, "error creating sigterm event source: %m");
|
|
|
|
r = sd_event_add_signal(manager->event, NULL, SIGHUP, on_sighup, manager);
|
|
if (r < 0)
|
|
return log_error_errno(r, "error creating sighup event source: %m");
|
|
|
|
r = sd_event_add_signal(manager->event, NULL, SIGCHLD, on_sigchld, manager);
|
|
if (r < 0)
|
|
return log_error_errno(r, "error creating sigchld event source: %m");
|
|
|
|
r = sd_event_set_watchdog(manager->event, true);
|
|
if (r < 0)
|
|
return log_error_errno(r, "error creating watchdog event source: %m");
|
|
|
|
r = sd_event_add_io(manager->event, &manager->ctrl_event, fd_ctrl, EPOLLIN, on_ctrl_msg, manager);
|
|
if (r < 0)
|
|
return log_error_errno(r, "error creating ctrl event source: %m");
|
|
|
|
/* This needs to be after the inotify and uevent handling, to make sure
|
|
* that the ping is send back after fully processing the pending uevents
|
|
* (including the synthetic ones we may create due to inotify events).
|
|
*/
|
|
r = sd_event_source_set_priority(manager->ctrl_event, SD_EVENT_PRIORITY_IDLE);
|
|
if (r < 0)
|
|
return log_error_errno(r, "cold not set IDLE event priority for ctrl event source: %m");
|
|
|
|
r = sd_event_add_io(manager->event, &manager->inotify_event, manager->fd_inotify, EPOLLIN, on_inotify, manager);
|
|
if (r < 0)
|
|
return log_error_errno(r, "error creating inotify event source: %m");
|
|
|
|
r = sd_event_add_io(manager->event, &manager->uevent_event, fd_uevent, EPOLLIN, on_uevent, manager);
|
|
if (r < 0)
|
|
return log_error_errno(r, "error creating uevent event source: %m");
|
|
|
|
r = sd_event_add_io(manager->event, NULL, fd_worker, EPOLLIN, on_worker, manager);
|
|
if (r < 0)
|
|
return log_error_errno(r, "error creating worker event source: %m");
|
|
|
|
r = sd_event_add_post(manager->event, NULL, on_post, manager);
|
|
if (r < 0)
|
|
return log_error_errno(r, "error creating post event source: %m");
|
|
|
|
*ret = manager;
|
|
manager = NULL;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int run(int fd_ctrl, int fd_uevent, const char *cgroup) {
|
|
_cleanup_(manager_freep) Manager *manager = NULL;
|
|
int r;
|
|
|
|
r = manager_new(&manager, fd_ctrl, fd_uevent, cgroup);
|
|
if (r < 0) {
|
|
r = log_error_errno(r, "failed to allocate manager object: %m");
|
|
goto exit;
|
|
}
|
|
|
|
r = udev_rules_apply_static_dev_perms(manager->rules);
|
|
if (r < 0)
|
|
log_error_errno(r, "failed to apply permissions on static device nodes: %m");
|
|
|
|
(void) sd_notifyf(false,
|
|
"READY=1\n"
|
|
"STATUS=Processing with %u children at max", arg_children_max);
|
|
|
|
r = sd_event_loop(manager->event);
|
|
if (r < 0) {
|
|
log_error_errno(r, "event loop failed: %m");
|
|
goto exit;
|
|
}
|
|
|
|
sd_event_get_exit_code(manager->event, &r);
|
|
|
|
exit:
|
|
sd_notify(false,
|
|
"STOPPING=1\n"
|
|
"STATUS=Shutting down...");
|
|
if (manager)
|
|
udev_ctrl_cleanup(manager->ctrl);
|
|
return r;
|
|
}
|
|
|
|
int main(int argc, char *argv[]) {
|
|
_cleanup_free_ char *cgroup = NULL;
|
|
int fd_ctrl = -1, fd_uevent = -1;
|
|
int r;
|
|
|
|
log_set_target(LOG_TARGET_AUTO);
|
|
udev_parse_config();
|
|
log_parse_environment();
|
|
log_open();
|
|
|
|
r = parse_argv(argc, argv);
|
|
if (r <= 0)
|
|
goto exit;
|
|
|
|
r = proc_cmdline_parse(parse_proc_cmdline_item, NULL, PROC_CMDLINE_STRIP_RD_PREFIX);
|
|
if (r < 0)
|
|
log_warning_errno(r, "failed to parse kernel command line, ignoring: %m");
|
|
|
|
if (arg_debug) {
|
|
log_set_target(LOG_TARGET_CONSOLE);
|
|
log_set_max_level(LOG_DEBUG);
|
|
}
|
|
|
|
r = must_be_root();
|
|
if (r < 0)
|
|
goto exit;
|
|
|
|
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);
|
|
}
|
|
|
|
/* set umask before creating any file/directory */
|
|
r = chdir("/");
|
|
if (r < 0) {
|
|
r = log_error_errno(errno, "could not change dir to /: %m");
|
|
goto exit;
|
|
}
|
|
|
|
umask(022);
|
|
|
|
r = mac_selinux_init();
|
|
if (r < 0) {
|
|
log_error_errno(r, "could not initialize labelling: %m");
|
|
goto exit;
|
|
}
|
|
|
|
r = mkdir_errno_wrapper("/run/udev", 0755);
|
|
if (r < 0 && r != -EEXIST) {
|
|
log_error_errno(r, "could not create /run/udev: %m");
|
|
goto exit;
|
|
}
|
|
|
|
dev_setup(NULL, UID_INVALID, GID_INVALID);
|
|
|
|
if (getppid() == 1) {
|
|
/* get our own cgroup, we regularly kill everything udev has left behind
|
|
we only do this on systemd systems, and only if we are directly spawned
|
|
by PID1. otherwise we are not guaranteed to have a dedicated cgroup */
|
|
r = cg_pid_get_path(SYSTEMD_CGROUP_CONTROLLER, 0, &cgroup);
|
|
if (r < 0) {
|
|
if (IN_SET(r, -ENOENT, -ENOMEDIUM))
|
|
log_debug_errno(r, "did not find dedicated cgroup: %m");
|
|
else
|
|
log_warning_errno(r, "failed to get cgroup: %m");
|
|
}
|
|
}
|
|
|
|
r = listen_fds(&fd_ctrl, &fd_uevent);
|
|
if (r < 0) {
|
|
r = log_error_errno(r, "could not listen on fds: %m");
|
|
goto exit;
|
|
}
|
|
|
|
if (arg_daemonize) {
|
|
pid_t pid;
|
|
|
|
log_info("starting version " PACKAGE_VERSION);
|
|
|
|
/* connect /dev/null to stdin, stdout, stderr */
|
|
if (log_get_max_level() < LOG_DEBUG) {
|
|
r = make_null_stdio();
|
|
if (r < 0)
|
|
log_warning_errno(r, "Failed to redirect standard streams to /dev/null: %m");
|
|
}
|
|
|
|
|
|
|
|
pid = fork();
|
|
switch (pid) {
|
|
case 0:
|
|
break;
|
|
case -1:
|
|
r = log_error_errno(errno, "fork of daemon failed: %m");
|
|
goto exit;
|
|
default:
|
|
mac_selinux_finish();
|
|
log_close();
|
|
_exit(EXIT_SUCCESS);
|
|
}
|
|
|
|
setsid();
|
|
|
|
write_string_file("/proc/self/oom_score_adj", "-1000", 0);
|
|
}
|
|
|
|
r = run(fd_ctrl, fd_uevent, cgroup);
|
|
|
|
exit:
|
|
mac_selinux_finish();
|
|
log_close();
|
|
return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS;
|
|
}
|