net.agent

这是关于usb等方面的热拔插源代码

#!/bin/sh
#
# Network hotplug policy agent for Linux 2.4 kernels
#
# Kernel NET hotplug params include:
#	
#	ACTION=%s [register or unregister]
#	INTERFACE=%s
#
# HISTORY:
#
# 25-Feb-2001	Special case ppp and similar (redhat)
# 23-Jan-2001	Log invocation of "ifup" if debugging
# 04-Jan-2001	Initial version of "new" hotplug agent.
#
# $Id: net.agent,v 1.20 2004/04/01 08:13:57 kroah Exp $
#

cd /etc/hotplug
. /etc/sysconfig/network-scripts/network-functions
. ./hotplug.functions
# DEBUG=yes export DEBUG

if [ "$INTERFACE" = "" ]; then
    mesg Bad NET invocation: \$INTERFACE is not set
    exit 1
fi

case $ACTION in
add|register)
    # Red Hat specific hack...
    if [ -f /etc/redhat-release ]; then
	# Don't do anything if the network is stopped
	if [ ! -f /var/lock/subsys/network ]; then
	    exit 0
	fi
    fi

    case $INTERFACE in
	# interfaces that are registered after being "up" (?)
	ppp*|ippp*|isdn*|plip*|lo*|irda*|dummy*|ipsec*|tun*|tap*)
	    debug_mesg assuming $INTERFACE is already up
	    exit 0
	    ;;
	# interfaces that are registered then brought up
	*)
	    # NOTE:  network configuration relies on administered state,
	    # we can't do much here without distro-specific knowledge
	    # such as whether/how to invoke DHCP, set up bridging, etc.

	    # Run ifrename as needed - Jean II
	    # Remap interface names based on MAC address. This workaround
	    # the dreaded configuration problem "all my cards are 'eth0'"...
	    # This needs to be done before ifup otherwise ifup will get
	    # confused by the name changed and because iface need to be
	    # down to change its name.
	    if [ -x /sbin/ifrename ] && [ -r /etc/iftab ]; then
		debug_mesg invoke ifrename for $INTERFACE
		NEWNAME=`/sbin/ifrename -i $INTERFACE`
		if [ -n "$NEWNAME" ]; then
		    debug_mesg iface $INTERFACE is remapped to $NEWNAME
		    INTERFACE=$NEWNAME
		fi;
	    fi

	    # RedHat and similar
	    export IN_HOTPLUG=1
	    if [ -x /sbin/ifup ]; then
	        addr=`get_hwaddr ${INTERFACE}`
		nconfig=`fgrep -il "HWADDR=$addr" /etc/sysconfig/network-scripts/ifcfg-*`
		[ -n "$nconfig" ] && INTERFACE=$nconfig
		debug_mesg invoke ifup $INTERFACE
		exec /sbin/ifup $INTERFACE

	    # Gentoo
	    elif [ -f /etc/gentoo-release ]; then
		script=/etc/init.d/net.$INTERFACE
		if [ -x "$script" ]; then
		    debug_mesg invoke "$script" --quiet start
		    exec "$script" --quiet start
		fi
	    else
		mesg "how do I bring interfaces up on this distro?"
	    fi
	    ;;
    esac
    mesg $1 $ACTION event not handled
    ;;

remove|unregister)
    case $INTERFACE in
	# interfaces that are unregistered after being "down" (?)
	ppp*|ippp*|isdn*|plip*|lo*|irda*|dummy*|ipsec*|tun*|tap*)
	    debug_mesg assuming $INTERFACE is already down
	    exit 0
	    ;;
	*)
	    # right now it looks like only Gentoo wants to care about
	    # unregistering network devices...
	    if [ -f /etc/gentoo-release ]; then
	    	script=/etc/init.d/net.$INTERFACE
		if [ -x "$script" ]; then
		    debug_mesg invoke "$script" --quiet stop
		    exec "$script" --quiet stop
		fi
	    fi
	    ;;
    esac
    mesg $1 $ACTION event not handled
    ;;

*)
    debug_mesg NET $ACTION event for $INTERFACE not supported
    exit 1 ;;

esac