/*
?*?Copyright?（C）?2003-2004?Greg?Kroah-Hartman?
?*?Copyright?（C）?2004-2006?Kay?Sievers?
?*
?*	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?version?2?of?the?License.
?*?
?*	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?write?to?the?Free?Software?Foundation?Inc.
?*	51?Franklin?Street?Fifth?Floor?Boston?MA??02110-1301?USA.
?*
?*/

#include?
#include?
#include?
#include?
#include?
#include?
#include?
#include?
#include?
#include?

#include?“udev.h“
#include?“udev_rules.h“
#include?“udev_selinux.h“

#ifdef?USE_LOG
void?log_message（int?priority?const?char?*format?...）
{
	va_list?args;

	if?（priority?>?udev_log_priority）
		return;

	va_start（args?format）;
	vsyslog（priority?format?args）;
	va_end（args）;
}
#endif

static?void?asmlinkage?sig_handler（int?signum）
{
	switch?（signum）?{
		case?SIGALRM:
			exit（1）;
		case?SIGINT:
		case?SIGTERM:
			exit（20?+?signum）;
	}
}

int?main（int?argc?char?*argv[]?char?*envp[]）
{
	struct?sysfs_device?*dev;
	struct?udevice?*udev;
	const?char?*maj?*min;
	struct?udev_rules?rules;
	const?char?*action;
	const?char?*devpath;
	const?char?*subsystem;
	struct?sigaction?act;
	int?devnull;
	int?retval?=?-EINVAL;

	if?（argc?==?2?&&?strcmp（argv[1]?“-V“）?==?0）?{
		printf（“%s\n“?UDEV_VERSION）;
		exit（0）;
	}

	/*?set?std?fd‘s?to?/dev/null?/sbin/hotplug?forks?us?we?don‘t?have?them?at?all?*/
	devnull?=?open（“/dev/null“?O_RDWR）;
	if?（devnull?>=?0）??{
		if?（devnull?!=?STDIN_FILENO）
			dup2（devnull?STDIN_FILENO）;
		if?（devnull?!=?STDOUT_FILENO）
			dup2（devnull?STDOUT_FILENO）;
		if?（devnull?!=?STDERR_FILENO）
			dup2（devnull?STDERR_FILENO）;
		if?（devnull?>?STDERR_FILENO）
			close（devnull）;
	}

	logging_init（“udev“）;
	if?（devnull?		err（“open?/dev/null?failed:?%s“?strerror（errno））;
	udev_config_init（）;
	selinux_init（）;
	dbg（“version?%s“?UDEV_VERSION）;

	/*?set?signal?handlers?*/
	memset（&act?0x00?sizeof（act））;
	act.sa_handler?=?（void?（*）（int））?sig_handler;
	sigemptyset?（&act.sa_mask）;
	act.sa_flags?=?0;
	sigaction（SIGALRM?&act?NULL）;
	sigaction（SIGINT?&act?NULL）;
	sigaction（SIGTERM?&act?NULL）;

	/*?trigger?timeout?to?prevent?hanging?processes?*/
	alarm（UDEV_ALARM_TIMEOUT）;

	action?=?getenv（“ACTION“）;
	devpath?=?getenv（“DEVPATH“）;
	subsystem?=?getenv（“SUBSYSTEM“）;
	/*?older?kernels?passed?the?SUBSYSTEM?only?as?argument?*/
	if?（subsystem?==?NULL?&&?argc?==?2）
		subsystem?=?argv[1];

	if?（action?==?NULL?||?subsystem?==?NULL?||?devpath?==?NULL）?{
		err（“ac