merge udev/, libudev/, systemd/ files in src/; move extras/ to src/

1 files changed, 1708 insertions, 0 deletions

diff --git a/src/udevd.c b/src/udevd.c
new file mode 100644
index 0000000000..b88213e5b5
--- /dev/null
+++ b/src/udevd.c
@@ -0,0 +1,1708 @@
+/*
+ * Copyright (C) 2004-2011 Kay Sievers <kay.sievers@vrfy.org>
+ * Copyright (C) 2004 Chris Friesen <chris_friesen@sympatico.ca>
+ * Copyright (C) 2009 Canonical Ltd.
+ * Copyright (C) 2009 Scott James Remnant <scott@netsplit.com>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <stddef.h>
+#include <signal.h>
+#include <unistd.h>
+#include <errno.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <stdbool.h>
+#include <string.h>
+#include <ctype.h>
+#include <fcntl.h>
+#include <time.h>
+#include <getopt.h>
+#include <dirent.h>
+#include <sys/time.h>
+#include <sys/prctl.h>
+#include <sys/socket.h>
+#include <sys/un.h>
+#include <sys/signalfd.h>
+#include <sys/epoll.h>
+#include <sys/poll.h>
+#include <sys/wait.h>
+#include <sys/stat.h>
+#include <sys/ioctl.h>
+#include <sys/inotify.h>
+#include <sys/utsname.h>
+
+#include "udev.h"
+#include "sd-daemon.h"
+
+static bool debug;
+
+void udev_main_log(struct udev *udev, int priority,
+		   const char *file, int line, const char *fn,
+		   const char *format, va_list args)
+{
+	if (debug) {
+		char buf[1024];
+		struct timespec ts;
+
+		vsnprintf(buf, sizeof(buf), format, args);
+		clock_gettime(CLOCK_MONOTONIC, &ts);
+		fprintf(stderr, "[%llu.%06u] [%u] %s: %s",
+			(unsigned long long) ts.tv_sec, (unsigned int) ts.tv_nsec/1000,
+			(int) getpid(), fn, buf);
+	} else {
+		vsyslog(priority, format, args);
+	}
+}
+
+static struct udev_rules *rules;
+static struct udev_queue_export *udev_queue_export;
+static struct udev_ctrl *udev_ctrl;
+static struct udev_monitor *monitor;
+static int worker_watch[2] = { -1, -1 };
+static int fd_signal = -1;
+static int fd_ep = -1;
+static int fd_inotify = -1;
+static bool stop_exec_queue;
+static bool reload;
+static int children;
+static int children_max;
+static int exec_delay;
+static sigset_t sigmask_orig;
+static UDEV_LIST(event_list);
+static UDEV_LIST(worker_list);
+static bool udev_exit;
+
+enum event_state {
+	EVENT_UNDEF,
+	EVENT_QUEUED,
+	EVENT_RUNNING,
+};
+
+struct event {
+	struct udev_list_node node;
+	struct udev *udev;
+	struct udev_device *dev;
+	enum event_state state;
+	int exitcode;
+	unsigned long long int delaying_seqnum;
+	unsigned long long int seqnum;
+	const char *devpath;
+	size_t devpath_len;
+	const char *devpath_old;
+	dev_t devnum;
+	bool is_block;
+	int ifindex;
+};
+
+static struct event *node_to_event(struct udev_list_node *node)
+{
+	char *event;
+
+	event = (char *)node;
+	event -= offsetof(struct event, node);
+	return (struct event *)event;
+}
+
+static void event_queue_cleanup(struct udev *udev, enum event_state type);
+
+enum worker_state {
+	WORKER_UNDEF,
+	WORKER_RUNNING,
+	WORKER_IDLE,
+	WORKER_KILLED,
+};
+
+struct worker {
+	struct udev_list_node node;
+	struct udev *udev;
+	int refcount;
+	pid_t pid;
+	struct udev_monitor *monitor;
+	enum worker_state state;
+	struct event *event;
+};
+
+/* passed from worker to main process */
+struct worker_message {
+	pid_t pid;
+	int exitcode;
+};
+
+static struct worker *node_to_worker(struct udev_list_node *node)
+{
+	char *worker;
+
+	worker = (char *)node;
+	worker -= offsetof(struct worker, node);
+	return (struct worker *)worker;
+}
+
+static void event_queue_delete(struct event *event, bool export)
+{
+	udev_list_node_remove(&event->node);
+
+	if (export) {
+		udev_queue_export_device_finished(udev_queue_export, event->dev);
+		info(event->udev, "seq %llu done with %i\n", udev_device_get_seqnum(event->dev), event->exitcode);
+	}
+	udev_device_unref(event->dev);
+	free(event);
+}
+
+static struct worker *worker_ref(struct worker *worker)
+{
+	worker->refcount++;
+	return worker;
+}
+
+static void worker_cleanup(struct worker *worker)
+{
+	udev_list_node_remove(&worker->node);
+	udev_monitor_unref(worker->monitor);
+	children--;
+	free(worker);
+}
+
+static void worker_unref(struct worker *worker)
+{
+	worker->refcount--;
+	if (worker->refcount > 0)
+		return;
+	info(worker->udev, "worker [%u] cleaned up\n", worker->pid);
+	worker_cleanup(worker);
+}
+
+static void worker_list_cleanup(struct udev *udev)
+{
+	struct udev_list_node *loop, *tmp;
+
+	udev_list_node_foreach_safe(loop, tmp, &worker_list) {
+		struct worker *worker = node_to_worker(loop);
+
+		worker_cleanup(worker);
+	}
+}
+
+static void worker_new(struct event *event)
+{
+	struct udev *udev = event->udev;
+	struct worker *worker;
+	struct udev_monitor *worker_monitor;
+	pid_t pid;
+
+	/* listen for new events */
+	worker_monitor = udev_monitor_new_from_netlink(udev, NULL);
+	if (worker_monitor == NULL)
+		return;
+	/* allow the main daemon netlink address to send devices to the worker */
+	udev_monitor_allow_unicast_sender(worker_monitor, monitor);
+	udev_monitor_enable_receiving(worker_monitor);
+
+	worker = calloc(1, sizeof(struct worker));
+	if (worker == NULL) {
+		udev_monitor_unref(worker_monitor);
+		return;
+	}
+	/* worker + event reference */
+	worker->refcount = 2;
+	worker->udev = udev;
+
+	pid = fork();
+	switch (pid) {
+	case 0: {
+		struct udev_device *dev = NULL;
+		int fd_monitor;
+		struct epoll_event ep_signal, ep_monitor;
+		sigset_t mask;
+		int rc = EXIT_SUCCESS;
+
+		/* move initial device from queue */
+		dev = event->dev;
+		event->dev = NULL;
+
+		free(worker);
+		worker_list_cleanup(udev);
+		event_queue_cleanup(udev, EVENT_UNDEF);
+		udev_queue_export_unref(udev_queue_export);
+		udev_monitor_unref(monitor);
+		udev_ctrl_unref(udev_ctrl);
+		close(fd_signal);
+		close(fd_ep);
+		close(worker_watch[READ_END]);
+
+		sigfillset(&mask);
+		fd_signal = signalfd(-1, &mask, SFD_NONBLOCK|SFD_CLOEXEC);
+		if (fd_signal < 0) {
+			err(udev, "error creating signalfd %m\n");
+			rc = 2;
+			goto out;
+		}
+
+		fd_ep = epoll_create1(EPOLL_CLOEXEC);
+		if (fd_ep < 0) {
+			err(udev, "error creating epoll fd: %m\n");
+			rc = 3;
+			goto out;
+		}
+
+		memset(&ep_signal, 0, sizeof(struct epoll_event));
+		ep_signal.events = EPOLLIN;
+		ep_signal.data.fd = fd_signal;
+
+		fd_monitor = udev_monitor_get_fd(worker_monitor);
+		memset(&ep_monitor, 0, sizeof(struct epoll_event));
+		ep_monitor.events = EPOLLIN;
+		ep_monitor.data.fd = fd_monitor;
+
+		if (epoll_ctl(fd_ep, EPOLL_CTL_ADD, fd_signal, &ep_signal) < 0 ||
+		    epoll_ctl(fd_ep, EPOLL_CTL_ADD, fd_monitor, &ep_monitor) < 0) {
+			err(udev, "fail to add fds to epoll: %m\n");
+			rc = 4;
+			goto out;
+		}
+
+		/* request TERM signal if parent exits */
+		prctl(PR_SET_PDEATHSIG, SIGTERM);
+
+		for (;;) {
+			struct udev_event *udev_event;
+			struct worker_message msg;
+			int err;
+
+			info(udev, "seq %llu running\n", udev_device_get_seqnum(dev));
+			udev_event = udev_event_new(dev);
+			if (udev_event == NULL) {
+				rc = 5;
+				goto out;
+			}
+
+			/* needed for SIGCHLD/SIGTERM in spawn() */
+			udev_event->fd_signal = fd_signal;
+
+			if (exec_delay > 0)
+				udev_event->exec_delay = exec_delay;
+
+			/* apply rules, create node, symlinks */
+			err = udev_event_execute_rules(udev_event, rules, &sigmask_orig);
+
+			if (err == 0)
+				udev_event_execute_run(udev_event, &sigmask_orig);
+
+			/* apply/restore inotify watch */
+			if (err == 0 && udev_event->inotify_watch) {
+				udev_watch_begin(udev, dev);
+				udev_device_update_db(dev);
+			}
+
+			/* send processed event back to libudev listeners */
+			udev_monitor_send_device(worker_monitor, NULL, dev);
+
+			/* send udevd the result of the event execution */
+			memset(&msg, 0, sizeof(struct worker_message));
+			if (err != 0)
+				msg.exitcode = err;
+			msg.pid = getpid();
+			send(worker_watch[WRITE_END], &msg, sizeof(struct worker_message), 0);
+
+			info(udev, "seq %llu processed with %i\n", udev_device_get_seqnum(dev), err);
+
+			udev_device_unref(dev);
+			dev = NULL;
+
+			if (udev_event->sigterm) {
+				udev_event_unref(udev_event);
+				goto out;
+			}
+
+			udev_event_unref(udev_event);
+
+			/* wait for more device messages from main udevd, or term signal */
+			while (dev == NULL) {
+				struct epoll_event ev[4];
+				int fdcount;
+				int i;
+
+				fdcount = epoll_wait(fd_ep, ev, ARRAY_SIZE(ev), -1);
+				if (fdcount < 0) {
+					if (errno == EINTR)
+						continue;
+					err = -errno;
+					err(udev, "failed to poll: %m\n");
+					goto out;
+				}
+
+				for (i = 0; i < fdcount; i++) {
+					if (ev[i].data.fd == fd_monitor && ev[i].events & EPOLLIN) {
+						dev = udev_monitor_receive_device(worker_monitor);
+						break;
+					} else if (ev[i].data.fd == fd_signal && ev[i].events & EPOLLIN) {
+						struct signalfd_siginfo fdsi;
+						ssize_t size;
+
+						size = read(fd_signal, &fdsi, sizeof(struct signalfd_siginfo));
+						if (size != sizeof(struct signalfd_siginfo))
+							continue;
+						switch (fdsi.ssi_signo) {
+						case SIGTERM:
+							goto out;
+						}
+					}
+				}
+			}
+		}
+out:
+		udev_device_unref(dev);
+		if (fd_signal >= 0)
+			close(fd_signal);
+		if (fd_ep >= 0)
+			close(fd_ep);
+		close(fd_inotify);
+		close(worker_watch[WRITE_END]);
+		udev_rules_unref(rules);
+		udev_monitor_unref(worker_monitor);
+		udev_unref(udev);
+		udev_log_close();
+		exit(rc);
+	}
+	case -1:
+		udev_monitor_unref(worker_monitor);
+		event->state = EVENT_QUEUED;
+		free(worker);
+		err(udev, "fork of child failed: %m\n");
+		break;
+	default:
+		/* close monitor, but keep address around */
+		udev_monitor_disconnect(worker_monitor);
+		worker->monitor = worker_monitor;
+		worker->pid = pid;
+		worker->state = WORKER_RUNNING;
+		worker->event = event;
+		event->state = EVENT_RUNNING;
+		udev_list_node_append(&worker->node, &worker_list);
+		children++;
+		info(udev, "seq %llu forked new worker [%u]\n", udev_device_get_seqnum(event->dev), pid);
+		break;
+	}
+}
+
+static void event_run(struct event *event)
+{
+	struct udev_list_node *loop;
+
+	udev_list_node_foreach(loop, &worker_list) {
+		struct worker *worker = node_to_worker(loop);
+		ssize_t count;
+
+		if (worker->state != WORKER_IDLE)
+			continue;
+
+		count = udev_monitor_send_device(monitor, worker->monitor, event->dev);
+		if (count < 0) {
+			err(event->udev, "worker [%u] did not accept message %zi (%m), kill it\n", worker->pid, count);
+			kill(worker->pid, SIGKILL);
+			worker->state = WORKER_KILLED;
+			continue;
+		}
+		worker_ref(worker);
+		worker->event = event;
+		worker->state = WORKER_RUNNING;
+		event->state = EVENT_RUNNING;
+		return;
+	}
+
+	if (children >= children_max) {
+		if (children_max > 1)
+			info(event->udev, "maximum number (%i) of children reached\n", children);
+		return;
+	}
+
+	/* start new worker and pass initial device */
+	worker_new(event);
+}
+
+static int event_queue_insert(struct udev_device *dev)
+{
+	struct event *event;
+
+	event = calloc(1, sizeof(struct event));
+	if (event == NULL)
+		return -1;
+
+	event->udev = udev_device_get_udev(dev);
+	event->dev = dev;
+	event->seqnum = udev_device_get_seqnum(dev);
+	event->devpath = udev_device_get_devpath(dev);
+	event->devpath_len = strlen(event->devpath);
+	event->devpath_old = udev_device_get_devpath_old(dev);
+	event->devnum = udev_device_get_devnum(dev);
+	event->is_block = (strcmp("block", udev_device_get_subsystem(dev)) == 0);
+	event->ifindex = udev_device_get_ifindex(dev);
+
+	udev_queue_export_device_queued(udev_queue_export, dev);
+	info(event->udev, "seq %llu queued, '%s' '%s'\n", udev_device_get_seqnum(dev),
+	     udev_device_get_action(dev), udev_device_get_subsystem(dev));
+
+	event->state = EVENT_QUEUED;
+	udev_list_node_append(&event->node, &event_list);
+	return 0;
+}
+
+static void worker_kill(struct udev *udev, int retain)
+{
+	struct udev_list_node *loop;
+	int max;
+
+	if (children <= retain)
+		return;
+
+	max = children - retain;
+
+	udev_list_node_foreach(loop, &worker_list) {
+		struct worker *worker = node_to_worker(loop);
+
+		if (max-- <= 0)
+			break;
+
+		if (worker->state == WORKER_KILLED)
+			continue;
+
+		worker->state = WORKER_KILLED;
+		kill(worker->pid, SIGTERM);
+	}
+}
+
+/* lookup event for identical, parent, child device */
+static bool is_devpath_busy(struct event *event)
+{
+	struct udev_list_node *loop;
+	size_t common;
+
+	/* check if queue contains events we depend on */
+	udev_list_node_foreach(loop, &event_list) {
+		struct event *loop_event = node_to_event(loop);
+
+		/* we already found a later event, earlier can not block us, no need to check again */
+		if (loop_event->seqnum < event->delaying_seqnum)
+			continue;
+
+		/* event we checked earlier still exists, no need to check again */
+		if (loop_event->seqnum == event->delaying_seqnum)
+			return true;
+
+		/* found ourself, no later event can block us */
+		if (loop_event->seqnum >= event->seqnum)
+			break;
+
+		/* check major/minor */
+		if (major(event->devnum) != 0 && event->devnum == loop_event->devnum && event->is_block == loop_event->is_block)
+			return true;
+
+		/* check network device ifindex */
+		if (event->ifindex != 0 && event->ifindex == loop_event->ifindex)
+			return true;
+
+		/* check our old name */
+		if (event->devpath_old != NULL && strcmp(loop_event->devpath, event->devpath_old) == 0) {
+			event->delaying_seqnum = loop_event->seqnum;
+			return true;
+		}
+
+		/* compare devpath */
+		common = MIN(loop_event->devpath_len, event->devpath_len);
+
+		/* one devpath is contained in the other? */
+		if (memcmp(loop_event->devpath, event->devpath, common) != 0)
+			continue;
+
+		/* identical device event found */
+		if (loop_event->devpath_len == event->devpath_len) {
+			/* devices names might have changed/swapped in the meantime */
+			if (major(event->devnum) != 0 && (event->devnum != loop_event->devnum || event->is_block != loop_event->is_block))
+				continue;
+			if (event->ifindex != 0 && event->ifindex != loop_event->ifindex)
+				continue;
+			event->delaying_seqnum = loop_event->seqnum;
+			return true;
+		}
+
+		/* parent device event found */
+		if (event->devpath[common] == '/') {
+			event->delaying_seqnum = loop_event->seqnum;
+			return true;
+		}
+
+		/* child device event found */
+		if (loop_event->devpath[common] == '/') {
+			event->delaying_seqnum = loop_event->seqnum;
+			return true;
+		}
+
+		/* no matching device */
+		continue;
+	}
+
+	return false;
+}
+
+static void event_queue_start(struct udev *udev)
+{
+	struct udev_list_node *loop;
+
+	udev_list_node_foreach(loop, &event_list) {
+		struct event *event = node_to_event(loop);
+
+		if (event->state != EVENT_QUEUED)
+			continue;
+
+		/* do not start event if parent or child event is still running */
+		if (is_devpath_busy(event)) {
+			dbg(udev, "delay seq %llu (%s)\n", event->seqnum, event->devpath);
+			continue;
+		}
+
+		event_run(event);
+	}
+}
+
+static void event_queue_cleanup(struct udev *udev, enum event_state match_type)
+{
+	struct udev_list_node *loop, *tmp;
+
+	udev_list_node_foreach_safe(loop, tmp, &event_list) {
+		struct event *event = node_to_event(loop);
+
+		if (match_type != EVENT_UNDEF && match_type != event->state)
+			continue;
+
+		event_queue_delete(event, false);
+	}
+}
+
+static void worker_returned(int fd_worker)
+{
+	for (;;) {
+		struct worker_message msg;
+		ssize_t size;
+		struct udev_list_node *loop;
+
+		size = recv(fd_worker, &msg, sizeof(struct worker_message), MSG_DONTWAIT);
+		if (size != sizeof(struct worker_message))
+			break;
+
+		/* lookup worker who sent the signal */
+		udev_list_node_foreach(loop, &worker_list) {
+			struct worker *worker = node_to_worker(loop);
+
+			if (worker->pid != msg.pid)
+				continue;
+
+			/* worker returned */
+			worker->event->exitcode = msg.exitcode;
+			event_queue_delete(worker->event, true);
+			worker->event = NULL;
+			if (worker->state != WORKER_KILLED)
+				worker->state = WORKER_IDLE;
+			worker_unref(worker);
+			break;
+		}
+	}
+}
+
+/* receive the udevd message from userspace */
+static struct udev_ctrl_connection *handle_ctrl_msg(struct udev_ctrl *uctrl)
+{
+	struct udev *udev = udev_ctrl_get_udev(uctrl);
+	struct udev_ctrl_connection *ctrl_conn;
+	struct udev_ctrl_msg *ctrl_msg = NULL;
+	const char *str;
+	int i;
+
+	ctrl_conn = udev_ctrl_get_connection(uctrl);
+	if (ctrl_conn == NULL)
+		goto out;
+
+	ctrl_msg = udev_ctrl_receive_msg(ctrl_conn);
+	if (ctrl_msg == NULL)
+		goto out;
+
+	i = udev_ctrl_get_set_log_level(ctrl_msg);
+	if (i >= 0) {
+		info(udev, "udevd message (SET_LOG_PRIORITY) received, log_priority=%i\n", i);
+		udev_set_log_priority(udev, i);
+		worker_kill(udev, 0);
+	}
+
+	if (udev_ctrl_get_stop_exec_queue(ctrl_msg) > 0) {
+		info(udev, "udevd message (STOP_EXEC_QUEUE) received\n");
+		stop_exec_queue = true;
+	}
+
+	if (udev_ctrl_get_start_exec_queue(ctrl_msg) > 0) {
+		info(udev, "udevd message (START_EXEC_QUEUE) received\n");
+		stop_exec_queue = false;
+	}
+
+	if (udev_ctrl_get_reload(ctrl_msg) > 0) {
+		info(udev, "udevd message (RELOAD) received\n");
+		reload = true;
+	}
+
+	str = udev_ctrl_get_set_env(ctrl_msg);
+	if (str != NULL) {
+		char *key;
+
+		key = strdup(str);
+		if (key != NULL) {
+			char *val;
+
+			val = strchr(key, '=');
+			if (val != NULL) {
+				val[0] = '\0';
+				val = &val[1];
+				if (val[0] == '\0') {
+					info(udev, "udevd message (ENV) received, unset '%s'\n", key);
+					udev_add_property(udev, key, NULL);
+				} else {
+					info(udev, "udevd message (ENV) received, set '%s=%s'\n", key, val);
+					udev_add_property(udev, key, val);
+				}
+			} else {
+				err(udev, "wrong key format '%s'\n", key);
+			}
+			free(key);
+		}
+		worker_kill(udev, 0);
+	}
+
+	i = udev_ctrl_get_set_children_max(ctrl_msg);
+	if (i >= 0) {
+		info(udev, "udevd message (SET_MAX_CHILDREN) received, children_max=%i\n", i);
+		children_max = i;
+	}
+
+	if (udev_ctrl_get_ping(ctrl_msg) > 0)
+		info(udev, "udevd message (SYNC) received\n");
+
+	if (udev_ctrl_get_exit(ctrl_msg) > 0) {
+		info(udev, "udevd message (EXIT) received\n");
+		udev_exit = true;
+		/* keep reference to block the client until we exit */
+		udev_ctrl_connection_ref(ctrl_conn);
+	}
+out:
+	udev_ctrl_msg_unref(ctrl_msg);
+	return udev_ctrl_connection_unref(ctrl_conn);
+}
+
+/* read inotify messages */
+static int handle_inotify(struct udev *udev)
+{
+	int nbytes, pos;
+	char *buf;
+	struct inotify_event *ev;
+
+	if ((ioctl(fd_inotify, FIONREAD, &nbytes) < 0) || (nbytes <= 0))
+		return 0;
+
+	buf = malloc(nbytes);
+	if (buf == NULL) {
+		err(udev, "error getting buffer for inotify\n");
+		return -1;
+	}
+
+	nbytes = read(fd_inotify, buf, nbytes);
+
+	for (pos = 0; pos < nbytes; pos += sizeof(struct inotify_event) + ev->len) {
+		struct udev_device *dev;
+
+		ev = (struct inotify_event *)(buf + pos);
+		dev = udev_watch_lookup(udev, ev->wd);
+		if (dev != NULL) {
+			info(udev, "inotify event: %x for %s\n", ev->mask, udev_device_get_devnode(dev));
+			if (ev->mask & IN_CLOSE_WRITE) {
+				char filename[UTIL_PATH_SIZE];
+				int fd;
+
+				info(udev, "device %s closed, synthesising 'change'\n", udev_device_get_devnode(dev));
+				util_strscpyl(filename, sizeof(filename), udev_device_get_syspath(dev), "/uevent", NULL);
+				fd = open(filename, O_WRONLY);
+				if (fd >= 0) {
+					if (write(fd, "change", 6) < 0)
+						info(udev, "error writing uevent: %m\n");
+					close(fd);
+				}
+			}
+			if (ev->mask & IN_IGNORED)
+				udev_watch_end(udev, dev);
+
+			udev_device_unref(dev);
+		}
+
+	}
+
+	free(buf);
+	return 0;
+}
+
+static void handle_signal(struct udev *udev, int signo)
+{
+	switch (signo) {
+	case SIGINT:
+	case SIGTERM:
+		udev_exit = true;
+		break;
+	case SIGCHLD:
+		for (;;) {
+			pid_t pid;
+			int status;
+			struct udev_list_node *loop, *tmp;
+
+			pid = waitpid(-1, &status, WNOHANG);
+			if (pid <= 0)
+				break;
+
+			udev_list_node_foreach_safe(loop, tmp, &worker_list) {
+				struct worker *worker = node_to_worker(loop);
+
+				if (worker->pid != pid)
+					continue;
+				info(udev, "worker [%u] exit\n", pid);
+
+				if (WIFEXITED(status)) {
+					if (WEXITSTATUS(status) != 0)
+						err(udev, "worker [%u] exit with return code %i\n", pid, WEXITSTATUS(status));
+				} else if (WIFSIGNALED(status)) {
+					err(udev, "worker [%u] terminated by signal %i (%s)\n",
+					    pid, WTERMSIG(status), strsignal(WTERMSIG(status)));
+				} else if (WIFSTOPPED(status)) {
+					err(udev, "worker [%u] stopped\n", pid);
+				} else if (WIFCONTINUED(status)) {
+					err(udev, "worker [%u] continued\n", pid);
+				} else {
+					err(udev, "worker [%u] exit with status 0x%04x\n", pid, status);
+				}
+
+				if (!WIFEXITED(status) || WEXITSTATUS(status) != 0) {
+					if (worker->event != NULL) {
+						err(udev, "worker [%u] failed while handling '%s'\n",
+						    pid, worker->event->devpath);
+						worker->event->exitcode = -32;
+						event_queue_delete(worker->event, true);
+						/* drop reference taken for state 'running' */
+						worker_unref(worker);
+					}
+				}
+				worker_unref(worker);
+				break;
+			}
+		}
+		break;
+	case SIGHUP:
+		reload = true;
+		break;
+	}
+}
+
+static void static_dev_create_from_modules(struct udev *udev)
+{
+	struct utsname kernel;
+	char modules[UTIL_PATH_SIZE];
+	char buf[4096];
+	FILE *f;
+
+	uname(&kernel);
+	util_strscpyl(modules, sizeof(modules), "/lib/modules/", kernel.release, "/modules.devname", NULL);
+	f = fopen(modules, "r");
+	if (f == NULL)
+		return;
+
+	while (fgets(buf, sizeof(buf), f) != NULL) {
+		char *s;
+		const char *modname;
+		const char *devname;
+		const char *devno;
+		int maj, min;
+		char type;
+		mode_t mode;
+		char filename[UTIL_PATH_SIZE];
+
+		if (buf[0] == '#')
+			continue;
+
+		modname = buf;
+		s = strchr(modname, ' ');
+		if (s == NULL)
+			continue;
+		s[0] = '\0';
+
+		devname = &s[1];
+		s = strchr(devname, ' ');
+		if (s == NULL)
+			continue;
+		s[0] = '\0';
+
+		devno = &s[1];
+		s = strchr(devno, ' ');
+		if (s == NULL)
+			s = strchr(devno, '\n');
+		if (s != NULL)
+			s[0] = '\0';
+		if (sscanf(devno, "%c%u:%u", &type, &maj, &min) != 3)
+			continue;
+
+		if (type == 'c')
+			mode = S_IFCHR;
+		else if (type == 'b')
+			mode = S_IFBLK;
+		else
+			continue;
+
+		util_strscpyl(filename, sizeof(filename), udev_get_dev_path(udev), "/", devname, NULL);
+		util_create_path_selinux(udev, filename);
+		udev_selinux_setfscreatecon(udev, filename, mode);
+		info(udev, "mknod '%s' %c%u:%u\n", filename, type, maj, min);
+		if (mknod(filename, mode, makedev(maj, min)) < 0 && errno == EEXIST)
+			utimensat(AT_FDCWD, filename, NULL, 0);
+		udev_selinux_resetfscreatecon(udev);
+	}
+
+	fclose(f);
+}
+
+static int copy_dev_dir(struct udev *udev, DIR *dir_from, DIR *dir_to, int maxdepth)
+{
+	struct dirent *dent;
+
+	for (dent = readdir(dir_from); dent != NULL; dent = readdir(dir_from)) {
+		struct stat stats;
+
+		if (dent->d_name[0] == '.')
+			continue;
+		if (fstatat(dirfd(dir_from), dent->d_name, &stats, AT_SYMLINK_NOFOLLOW) != 0)
+			continue;
+
+		if (S_ISBLK(stats.st_mode) || S_ISCHR(stats.st_mode)) {
+			udev_selinux_setfscreateconat(udev, dirfd(dir_to), dent->d_name, stats.st_mode & 0777);
+			if (mknodat(dirfd(dir_to), dent->d_name, stats.st_mode, stats.st_rdev) == 0) {
+				fchmodat(dirfd(dir_to), dent->d_name, stats.st_mode & 0777, 0);
+				fchownat(dirfd(dir_to), dent->d_name, stats.st_uid, stats.st_gid, 0);
+			} else {
+				utimensat(dirfd(dir_to), dent->d_name, NULL, 0);
+			}
+			udev_selinux_resetfscreatecon(udev);
+		} else if (S_ISLNK(stats.st_mode)) {
+			char target[UTIL_PATH_SIZE];
+			ssize_t len;
+
+			len = readlinkat(dirfd(dir_from), dent->d_name, target, sizeof(target));
+			if (len <= 0 || len == (ssize_t)sizeof(target))
+				continue;
+			target[len] = '\0';
+			udev_selinux_setfscreateconat(udev, dirfd(dir_to), dent->d_name, S_IFLNK);
+			if (symlinkat(target, dirfd(dir_to), dent->d_name) < 0 && errno == EEXIST)
+				utimensat(dirfd(dir_to), dent->d_name, NULL, AT_SYMLINK_NOFOLLOW);
+			udev_selinux_resetfscreatecon(udev);
+		} else if (S_ISDIR(stats.st_mode)) {
+			DIR *dir2_from, *dir2_to;
+
+			if (maxdepth == 0)
+				continue;
+
+			udev_selinux_setfscreateconat(udev, dirfd(dir_to), dent->d_name, S_IFDIR|0755);
+			mkdirat(dirfd(dir_to), dent->d_name, 0755);
+			udev_selinux_resetfscreatecon(udev);
+
+			dir2_to = fdopendir(openat(dirfd(dir_to), dent->d_name, O_RDONLY|O_NONBLOCK|O_DIRECTORY|O_CLOEXEC));
+			if (dir2_to == NULL)
+				continue;
+
+			dir2_from = fdopendir(openat(dirfd(dir_from), dent->d_name, O_RDONLY|O_NONBLOCK|O_DIRECTORY|O_CLOEXEC));
+			if (dir2_from == NULL) {
+				closedir(dir2_to);
+				continue;
+			}
+
+			copy_dev_dir(udev, dir2_from, dir2_to, maxdepth-1);
+
+			closedir(dir2_to);
+			closedir(dir2_from);
+		}
+	}
+
+	return 0;
+}
+
+static void static_dev_create_links(struct udev *udev, DIR *dir)
+{
+	struct stdlinks {
+		const char *link;
+		const char *target;
+	};
+	static const struct stdlinks stdlinks[] = {
+		{ "core", "/proc/kcore" },
+		{ "fd", "/proc/self/fd" },
+		{ "stdin", "/proc/self/fd/0" },
+		{ "stdout", "/proc/self/fd/1" },
+		{ "stderr", "/proc/self/fd/2" },
+	};
+	unsigned int i;
+
+	for (i = 0; i < ARRAY_SIZE(stdlinks); i++) {
+		struct stat sb;
+
+		if (stat(stdlinks[i].target, &sb) == 0) {
+			udev_selinux_setfscreateconat(udev, dirfd(dir), stdlinks[i].link, S_IFLNK);
+			if (symlinkat(stdlinks[i].target, dirfd(dir), stdlinks[i].link) < 0 && errno == EEXIST)
+				utimensat(dirfd(dir), stdlinks[i].link, NULL, AT_SYMLINK_NOFOLLOW);
+			udev_selinux_resetfscreatecon(udev);
+		}
+	}
+}
+
+static void static_dev_create_from_devices(struct udev *udev, DIR *dir)
+{
+	DIR *dir_from;
+
+	dir_from = opendir(PKGLIBEXECDIR "/devices");
+	if (dir_from == NULL)
+		return;
+	copy_dev_dir(udev, dir_from, dir, 8);
+	closedir(dir_from);
+}
+
+static void static_dev_create(struct udev *udev)
+{
+	DIR *dir;
+
+	dir = opendir(udev_get_dev_path(udev));
+	if (dir == NULL)
+		return;
+
+	static_dev_create_links(udev, dir);
+	static_dev_create_from_devices(udev, dir);
+
+	closedir(dir);
+}
+
+static int mem_size_mb(void)
+{
+	FILE *f;
+	char buf[4096];
+	long int memsize = -1;
+
+	f = fopen("/proc/meminfo", "r");
+	if (f == NULL)
+		return -1;
+
+	while (fgets(buf, sizeof(buf), f) != NULL) {
+		long int value;
+
+		if (sscanf(buf, "MemTotal: %ld kB", &value) == 1) {
+			memsize = value / 1024;
+			break;
+		}
+	}
+
+	fclose(f);
+	return memsize;
+}
+
+static int convert_db(struct udev *udev)
+{
+	char filename[UTIL_PATH_SIZE];
+	FILE *f;
+	struct udev_enumerate *udev_enumerate;
+	struct udev_list_entry *list_entry;
+
+	/* current database */
+	util_strscpyl(filename, sizeof(filename), udev_get_run_path(udev), "/data", NULL);
+	if (access(filename, F_OK) >= 0)
+		return 0;
+
+	/* make sure we do not get here again */
+	util_create_path(udev, filename);
+	mkdir(filename, 0755);
+
+	/* old database */
+	util_strscpyl(filename, sizeof(filename), udev_get_dev_path(udev), "/.udev/db", NULL);
+	if (access(filename, F_OK) < 0)
+		return 0;
+
+	f = fopen("/dev/kmsg", "w");
+	if (f != NULL) {
+		fprintf(f, "<30>udevd[%u]: converting old udev database\n", getpid());
+		fclose(f);
+	}
+
+	udev_enumerate = udev_enumerate_new(udev);
+	if (udev_enumerate == NULL)
+		return -1;
+	udev_enumerate_scan_devices(udev_enumerate);
+	udev_list_entry_foreach(list_entry, udev_enumerate_get_list_entry(udev_enumerate)) {
+		struct udev_device *device;
+
+		device = udev_device_new_from_syspath(udev, udev_list_entry_get_name(list_entry));
+		if (device == NULL)
+			continue;
+
+		/* try to find the old database for devices without a current one */
+		if (udev_device_read_db(device, NULL) < 0) {
+			bool have_db;
+			const char *id;
+			struct stat stats;
+			char devpath[UTIL_PATH_SIZE];
+			char from[UTIL_PATH_SIZE];
+
+			have_db = false;
+
+			/* find database in old location */
+			id = udev_device_get_id_filename(device);
+			util_strscpyl(from, sizeof(from), udev_get_dev_path(udev), "/.udev/db/", id, NULL);
+			if (lstat(from, &stats) == 0) {
+				if (!have_db) {
+					udev_device_read_db(device, from);
+					have_db = true;
+				}
+				unlink(from);
+			}
+
+			/* find old database with $subsys:$sysname name */
+			util_strscpyl(from, sizeof(from), udev_get_dev_path(udev),
+				     "/.udev/db/", udev_device_get_subsystem(device), ":",
+				     udev_device_get_sysname(device), NULL);
+			if (lstat(from, &stats) == 0) {
+				if (!have_db) {
+					udev_device_read_db(device, from);
+					have_db = true;
+				}
+				unlink(from);
+			}
+
+			/* find old database with the encoded devpath name */
+			util_path_encode(udev_device_get_devpath(device), devpath, sizeof(devpath));
+			util_strscpyl(from, sizeof(from), udev_get_dev_path(udev), "/.udev/db/", devpath, NULL);
+			if (lstat(from, &stats) == 0) {
+				if (!have_db) {
+					udev_device_read_db(device, from);
+					have_db = true;
+				}
+				unlink(from);
+			}
+
+			/* write out new database */
+			if (have_db)
+				udev_device_update_db(device);
+		}
+		udev_device_unref(device);
+	}
+	udev_enumerate_unref(udev_enumerate);
+	return 0;
+}
+
+static int systemd_fds(struct udev *udev, int *rctrl, int *rnetlink)
+{
+	int ctrl = -1, netlink = -1;
+	int fd, n;
+
+	n = sd_listen_fds(true);
+	if (n <= 0)
+		return -1;
+
+	for (fd = SD_LISTEN_FDS_START; fd < n + SD_LISTEN_FDS_START; fd++) {
+		if (sd_is_socket(fd, AF_LOCAL, SOCK_SEQPACKET, -1)) {
+			if (ctrl >= 0)
+				return -1;
+			ctrl = fd;
+			continue;
+		}
+
+		if (sd_is_socket(fd, AF_NETLINK, SOCK_RAW, -1)) {
+			if (netlink >= 0)
+				return -1;
+			netlink = fd;
+			continue;
+		}
+
+		return -1;
+	}
+
+	if (ctrl < 0 || netlink < 0)
+		return -1;
+
+	info(udev, "ctrl=%i netlink=%i\n", ctrl, netlink);
+	*rctrl = ctrl;
+	*rnetlink = netlink;
+	return 0;
+}
+
+static bool check_rules_timestamp(struct udev *udev)
+{
+	char **p;
+	unsigned long long *stamp_usec;
+	int i, n;
+	bool changed = false;
+
+	n = udev_get_rules_path(udev, &p, &stamp_usec);
+	for (i = 0; i < n; i++) {
+		struct stat stats;
+
+		if (stat(p[i], &stats) < 0)
+			continue;
+
+		if (stamp_usec[i] == ts_usec(&stats.st_mtim))
+			continue;
+
+		/* first check */
+		if (stamp_usec[i] != 0) {
+			info(udev, "reload - timestamp of '%s' changed\n", p[i]);
+			changed = true;
+		}
+
+		/* update timestamp */
+		stamp_usec[i] = ts_usec(&stats.st_mtim);
+	}
+
+	return changed;
+}
+
+int main(int argc, char *argv[])
+{
+	struct udev *udev;
+	FILE *f;
+	sigset_t mask;
+	int daemonize = false;
+	int resolve_names = 1;
+	static const struct option options[] = {
+		{ "daemon", no_argument, NULL, 'd' },
+		{ "debug", no_argument, NULL, 'D' },
+		{ "children-max", required_argument, NULL, 'c' },
+		{ "exec-delay", required_argument, NULL, 'e' },
+		{ "resolve-names", required_argument, NULL, 'N' },
+		{ "help", no_argument, NULL, 'h' },
+		{ "version", no_argument, NULL, 'V' },
+		{}
+	};
+	int fd_ctrl = -1;
+	int fd_netlink = -1;
+	int fd_worker = -1;
+	struct epoll_event ep_ctrl, ep_inotify, ep_signal, ep_netlink, ep_worker;
+	struct udev_ctrl_connection *ctrl_conn = NULL;
+	char **s;
+	int rc = 1;
+
+	udev = udev_new();
+	if (udev == NULL)
+		goto exit;
+
+	udev_log_init("udevd");
+	udev_set_log_fn(udev, udev_main_log);
+	info(udev, "version %s\n", VERSION);
+	udev_selinux_init(udev);
+
+	for (;;) {
+		int option;
+
+		option = getopt_long(argc, argv, "c:deDtN:hV", options, NULL);
+		if (option == -1)
+			break;
+
+		switch (option) {
+		case 'd':
+			daemonize = true;
+			break;
+		case 'c':
+			children_max = strtoul(optarg, NULL, 0);
+			break;
+		case 'e':
+			exec_delay = strtoul(optarg, NULL, 0);
+			break;
+		case 'D':
+			debug = true;
+			if (udev_get_log_priority(udev) < LOG_INFO)
+				udev_set_log_priority(udev, LOG_INFO);
+			break;
+		case 'N':
+			if (strcmp (optarg, "early") == 0) {
+				resolve_names = 1;
+			} else if (strcmp (optarg, "late") == 0) {
+				resolve_names = 0;
+			} else if (strcmp (optarg, "never") == 0) {
+				resolve_names = -1;
+			} else {
+				fprintf(stderr, "resolve-names must be early, late or never\n");
+				err(udev, "resolve-names must be early, late or never\n");
+				goto exit;
+			}
+			break;
+		case 'h':
+			printf("Usage: udevd OPTIONS\n"
+			       "  --daemon\n"
+			       "  --debug\n"
+			       "  --children-max=<maximum number of workers>\n"
+			       "  --exec-delay=<seconds to wait before executing RUN=>\n"
+			       "  --resolve-names=early|late|never\n"
+			       "  --version\n"
+			       "  --help\n"
+			       "\n");
+			goto exit;
+		case 'V':
+			printf("%s\n", VERSION);
+			goto exit;
+		default:
+			goto exit;
+		}
+	}
+
+	/*
+	 * read the kernel commandline, in case we need to get into debug mode
+	 *   udev.log-priority=<level>              syslog priority
+	 *   udev.children-max=<number of workers>  events are fully serialized if set to 1
+	 *
+	 */
+	f = fopen("/proc/cmdline", "r");
+	if (f != NULL) {
+		char cmdline[4096];
+
+		if (fgets(cmdline, sizeof(cmdline), f) != NULL) {
+			char *pos;
+
+			pos = strstr(cmdline, "udev.log-priority=");
+			if (pos != NULL) {
+				pos += strlen("udev.log-priority=");
+				udev_set_log_priority(udev, util_log_priority(pos));
+			}
+
+			pos = strstr(cmdline, "udev.children-max=");
+			if (pos != NULL) {
+				pos += strlen("udev.children-max=");
+				children_max = strtoul(pos, NULL, 0);
+			}
+
+			pos = strstr(cmdline, "udev.exec-delay=");
+			if (pos != NULL) {
+				pos += strlen("udev.exec-delay=");
+				exec_delay = strtoul(pos, NULL, 0);
+			}
+		}
+		fclose(f);
+	}
+
+	if (getuid() != 0) {
+		fprintf(stderr, "root privileges required\n");
+		err(udev, "root privileges required\n");
+		goto exit;
+	}
+
+	/* set umask before creating any file/directory */
+	chdir("/");
+	umask(022);
+
+	/* /run/udev */
+	mkdir(udev_get_run_path(udev), 0755);
+
+	/* create standard links, copy static nodes, create nodes from modules */
+	static_dev_create(udev);
+	static_dev_create_from_modules(udev);
+
+	/* before opening new files, make sure std{in,out,err} fds are in a sane state */
+	if (daemonize) {
+		int fd;
+
+		fd = open("/dev/null", O_RDWR);
+		if (fd >= 0) {
+			if (write(STDOUT_FILENO, 0, 0) < 0)
+				dup2(fd, STDOUT_FILENO);
+			if (write(STDERR_FILENO, 0, 0) < 0)
+				dup2(fd, STDERR_FILENO);
+			if (fd > STDERR_FILENO)
+				close(fd);
+		} else {
+			fprintf(stderr, "cannot open /dev/null\n");
+			err(udev, "cannot open /dev/null\n");
+		}
+	}
+
+	if (systemd_fds(udev, &fd_ctrl, &fd_netlink) >= 0) {
+		/* get control and netlink socket from from systemd */
+		udev_ctrl = udev_ctrl_new_from_fd(udev, fd_ctrl);
+		if (udev_ctrl == NULL) {
+			err(udev, "error taking over udev control socket");
+			rc = 1;
+			goto exit;
+		}
+
+		monitor = udev_monitor_new_from_netlink_fd(udev, "kernel", fd_netlink);
+		if (monitor == NULL) {
+			err(udev, "error taking over netlink socket\n");
+			rc = 3;
+			goto exit;
+		}
+	} else {
+		/* open control and netlink socket */
+		udev_ctrl = udev_ctrl_new(udev);
+		if (udev_ctrl == NULL) {
+			fprintf(stderr, "error initializing udev control socket");
+			err(udev, "error initializing udev control socket");
+			rc = 1;
+			goto exit;
+		}
+		fd_ctrl = udev_ctrl_get_fd(udev_ctrl);
+
+		monitor = udev_monitor_new_from_netlink(udev, "kernel");
+		if (monitor == NULL) {
+			fprintf(stderr, "error initializing netlink socket\n");
+			err(udev, "error initializing netlink socket\n");
+			rc = 3;
+			goto exit;
+		}
+		fd_netlink = udev_monitor_get_fd(monitor);
+	}
+
+	if (udev_monitor_enable_receiving(monitor) < 0) {
+		fprintf(stderr, "error binding netlink socket\n");
+		err(udev, "error binding netlink socket\n");
+		rc = 3;
+		goto exit;
+	}
+
+	if (udev_ctrl_enable_receiving(udev_ctrl) < 0) {
+		fprintf(stderr, "error binding udev control socket\n");
+		err(udev, "error binding udev control socket\n");
+		rc = 1;
+		goto exit;
+	}
+
+	udev_monitor_set_receive_buffer_size(monitor, 128*1024*1024);
+
+	/* create queue file before signalling 'ready', to make sure we block 'settle' */
+	udev_queue_export = udev_queue_export_new(udev);
+	if (udev_queue_export == NULL) {
+		err(udev, "error creating queue file\n");
+		goto exit;
+	}
+
+	if (daemonize) {
+		pid_t pid;
+		int fd;
+
+		pid = fork();
+		switch (pid) {
+		case 0:
+			break;
+		case -1:
+			err(udev, "fork of daemon failed: %m\n");
+			rc = 4;
+			goto exit;
+		default:
+			rc = EXIT_SUCCESS;
+			goto exit_daemonize;
+		}
+
+		setsid();
+
+		fd = open("/proc/self/oom_score_adj", O_RDWR);
+		if (fd < 0) {
+			/* Fallback to old interface */
+			fd = open("/proc/self/oom_adj", O_RDWR);
+			if (fd < 0) {
+				err(udev, "error disabling OOM: %m\n");
+			} else {
+				/* OOM_DISABLE == -17 */
+				write(fd, "-17", 3);
+				close(fd);
+			}
+		} else {
+			write(fd, "-1000", 5);
+			close(fd);
+		}
+	} else {
+		sd_notify(1, "READY=1");
+	}
+
+	f = fopen("/dev/kmsg", "w");
+	if (f != NULL) {
+		fprintf(f, "<30>udevd[%u]: starting version " VERSION "\n", getpid());
+		fclose(f);
+	}
+
+	if (!debug) {
+		int fd;
+
+		fd = open("/dev/null", O_RDWR);
+		if (fd >= 0) {
+			dup2(fd, STDIN_FILENO);
+			dup2(fd, STDOUT_FILENO);
+			dup2(fd, STDERR_FILENO);
+			close(fd);
+		}
+	}
+
+	fd_inotify = udev_watch_init(udev);
+	if (fd_inotify < 0) {
+		fprintf(stderr, "error initializing inotify\n");
+		err(udev, "error initializing inotify\n");
+		rc = 4;
+		goto exit;
+	}
+	udev_watch_restore(udev);
+
+	/* block and listen to all signals on signalfd */
+	sigfillset(&mask);
+	sigprocmask(SIG_SETMASK, &mask, &sigmask_orig);
+	fd_signal = signalfd(-1, &mask, SFD_NONBLOCK|SFD_CLOEXEC);
+	if (fd_signal < 0) {
+		fprintf(stderr, "error creating signalfd\n");
+		err(udev, "error creating signalfd\n");
+		rc = 5;
+		goto exit;
+	}
+
+	/* unnamed socket from workers to the main daemon */
+	if (socketpair(AF_LOCAL, SOCK_DGRAM|SOCK_CLOEXEC, 0, worker_watch) < 0) {
+		fprintf(stderr, "error creating socketpair\n");
+		err(udev, "error creating socketpair\n");
+		rc = 6;
+		goto exit;
+	}
+	fd_worker = worker_watch[READ_END];
+
+	udev_builtin_init(udev);
+
+	rules = udev_rules_new(udev, resolve_names);
+	if (rules == NULL) {
+		err(udev, "error reading rules\n");
+		goto exit;
+	}
+
+	memset(&ep_ctrl, 0, sizeof(struct epoll_event));
+	ep_ctrl.events = EPOLLIN;
+	ep_ctrl.data.fd = fd_ctrl;
+
+	memset(&ep_inotify, 0, sizeof(struct epoll_event));
+	ep_inotify.events = EPOLLIN;
+	ep_inotify.data.fd = fd_inotify;
+
+	memset(&ep_signal, 0, sizeof(struct epoll_event));
+	ep_signal.events = EPOLLIN;
+	ep_signal.data.fd = fd_signal;
+
+	memset(&ep_netlink, 0, sizeof(struct epoll_event));
+	ep_netlink.events = EPOLLIN;
+	ep_netlink.data.fd = fd_netlink;
+
+	memset(&ep_worker, 0, sizeof(struct epoll_event));
+	ep_worker.events = EPOLLIN;
+	ep_worker.data.fd = fd_worker;
+
+	fd_ep = epoll_create1(EPOLL_CLOEXEC);
+	if (fd_ep < 0) {
+		err(udev, "error creating epoll fd: %m\n");
+		goto exit;
+	}
+	if (epoll_ctl(fd_ep, EPOLL_CTL_ADD, fd_ctrl, &ep_ctrl) < 0 ||
+	    epoll_ctl(fd_ep, EPOLL_CTL_ADD, fd_inotify, &ep_inotify) < 0 ||
+	    epoll_ctl(fd_ep, EPOLL_CTL_ADD, fd_signal, &ep_signal) < 0 ||
+	    epoll_ctl(fd_ep, EPOLL_CTL_ADD, fd_netlink, &ep_netlink) < 0 ||
+	    epoll_ctl(fd_ep, EPOLL_CTL_ADD, fd_worker, &ep_worker) < 0) {
+		err(udev, "fail to add fds to epoll: %m\n");
+		goto exit;
+	}
+
+	/* if needed, convert old database from earlier udev version */
+	convert_db(udev);
+
+	if (children_max <= 0) {
+		int memsize = mem_size_mb();
+
+		/* set value depending on the amount of RAM */
+		if (memsize > 0)
+			children_max = 128 + (memsize / 8);
+		else
+			children_max = 128;
+	}
+	info(udev, "set children_max to %u\n", children_max);
+
+	udev_rules_apply_static_dev_perms(rules);
+
+	udev_list_node_init(&event_list);
+	udev_list_node_init(&worker_list);
+
+	for (;;) {
+		static unsigned long long last_usec;
+		struct epoll_event ev[8];
+		int fdcount;
+		int timeout;
+		bool is_worker, is_signal, is_inotify, is_netlink, is_ctrl;
+		int i;
+
+		if (udev_exit) {
+			/* close sources of new events and discard buffered events */
+			if (fd_ctrl >= 0) {
+				epoll_ctl(fd_ep, EPOLL_CTL_DEL, fd_ctrl, NULL);
+				fd_ctrl = -1;
+			}
+			if (monitor != NULL) {
+				epoll_ctl(fd_ep, EPOLL_CTL_DEL, fd_netlink, NULL);
+				udev_monitor_unref(monitor);
+				monitor = NULL;
+			}
+			if (fd_inotify >= 0) {
+				epoll_ctl(fd_ep, EPOLL_CTL_DEL, fd_inotify, NULL);
+				close(fd_inotify);
+				fd_inotify = -1;
+			}
+
+			/* discard queued events and kill workers */
+			event_queue_cleanup(udev, EVENT_QUEUED);
+			worker_kill(udev, 0);
+
+			/* exit after all has cleaned up */
+			if (udev_list_node_is_empty(&event_list) && udev_list_node_is_empty(&worker_list))
+				break;
+
+			/* timeout at exit for workers to finish */
+			timeout = 60 * 1000;
+		} else if (udev_list_node_is_empty(&event_list) && children > 2) {
+			/* set timeout to kill idle workers */
+			timeout = 3 * 1000;
+		} else {
+			timeout = -1;
+		}
+		fdcount = epoll_wait(fd_ep, ev, ARRAY_SIZE(ev), timeout);
+		if (fdcount < 0)
+			continue;
+
+		if (fdcount == 0) {
+			if (udev_exit) {
+				info(udev, "timeout, giving up waiting for workers to finish\n");
+				break;
+			}
+
+			/* timeout - kill idle workers */
+			worker_kill(udev, 2);
+		}
+
+		is_worker = is_signal = is_inotify = is_netlink = is_ctrl = false;
+		for (i = 0; i < fdcount; i++) {
+			if (ev[i].data.fd == fd_worker && ev[i].events & EPOLLIN)
+				is_worker = true;
+			else if (ev[i].data.fd == fd_netlink && ev[i].events & EPOLLIN)
+				is_netlink = true;
+			else if (ev[i].data.fd == fd_signal && ev[i].events & EPOLLIN)
+				is_signal = true;
+			else if (ev[i].data.fd == fd_inotify && ev[i].events & EPOLLIN)
+				is_inotify = true;
+			else if (ev[i].data.fd == fd_ctrl && ev[i].events & EPOLLIN)
+				is_ctrl = true;
+		}
+
+		/* check for changed config, every 3 seconds at most */
+		if ((now_usec() - last_usec) > 3 * 1000 * 1000) {
+			if (check_rules_timestamp(udev))
+				reload = true;
+			if (udev_builtin_validate(udev))
+				reload = true;
+
+			last_usec = now_usec();
+		}
+
+		/* reload requested, HUP signal received, rules changed, builtin changed */
+		if (reload) {
+			worker_kill(udev, 0);
+			rules = udev_rules_unref(rules);
+			udev_builtin_exit(udev);
+			reload = 0;
+		}
+
+		/* event has finished */
+		if (is_worker)
+			worker_returned(fd_worker);
+
+		if (is_netlink) {
+			struct udev_device *dev;
+
+			dev = udev_monitor_receive_device(monitor);
+			if (dev != NULL) {
+				udev_device_set_usec_initialized(dev, now_usec());
+				if (event_queue_insert(dev) < 0)
+					udev_device_unref(dev);
+			}
+		}
+
+		/* start new events */
+		if (!udev_list_node_is_empty(&event_list) && !udev_exit && !stop_exec_queue) {
+			if (rules == NULL)
+				rules = udev_rules_new(udev, resolve_names);
+			if (rules != NULL)
+				event_queue_start(udev);
+		}
+
+		if (is_signal) {
+			struct signalfd_siginfo fdsi;
+			ssize_t size;
+
+			size = read(fd_signal, &fdsi, sizeof(struct signalfd_siginfo));
+			if (size == sizeof(struct signalfd_siginfo))
+				handle_signal(udev, fdsi.ssi_signo);
+		}
+
+		/* we are shutting down, the events below are not handled anymore */
+		if (udev_exit)
+			continue;
+
+		/* device node watch */
+		if (is_inotify)
+			handle_inotify(udev);
+
+		/*
+		 * This needs to be after the inotify handling, to make sure,
+		 * that the ping is send back after the possibly generated
+		 * "change" events by the inotify device node watch.
+		 *
+		 * A single time we may receive a client connection which we need to
+		 * keep open to block the client. It will be closed right before we
+		 * exit.
+		 */
+		if (is_ctrl)
+			ctrl_conn = handle_ctrl_msg(udev_ctrl);
+	}
+
+	rc = EXIT_SUCCESS;
+exit:
+	udev_queue_export_cleanup(udev_queue_export);
+	udev_ctrl_cleanup(udev_ctrl);
+exit_daemonize:
+	if (fd_ep >= 0)
+		close(fd_ep);
+	worker_list_cleanup(udev);
+	event_queue_cleanup(udev, EVENT_UNDEF);
+	udev_rules_unref(rules);
+	udev_builtin_exit(udev);
+	if (fd_signal >= 0)
+		close(fd_signal);
+	if (worker_watch[READ_END] >= 0)
+		close(worker_watch[READ_END]);
+	if (worker_watch[WRITE_END] >= 0)
+		close(worker_watch[WRITE_END]);
+	udev_monitor_unref(monitor);
+	udev_queue_export_unref(udev_queue_export);
+	udev_ctrl_connection_unref(ctrl_conn);
+	udev_ctrl_unref(udev_ctrl);
+	udev_selinux_exit(udev);
+	udev_unref(udev);
+	udev_log_close();
+	return rc;
+}