default.hotplug

嵌入式linux中的usb热拔插脚本,可以实现u盘的热拔插功能

#!/bin/sh
#
# This version of /sbin/hotplug should works on most GNU/Linux systems
# using Linux 2.2.18+ or 2.4.* kernels.  On 2.2.*, only USB has such
# hotplugging support; on 2.4.*, so do PCI/Cardbus and network interfaces.
#
# In 2.5, both classes and busses can report hotplug events as part
# of the driver model core functionality.  Plus, /sys/$DEVPATH is
# available for scripting, as well as the $ACTION being reported.
#
# The kernel HOTPLUG configuration option needs to be enabled, and most
# device drivers will be compiled for MODULES (make allmod).
#
#
# HISTORY:
#
# 21-Nov-2002	Optionally log events; 2.5 notes (db)
# 26-Feb-2001	Cleanup (Gioele Barabucci)
# 14-Feb-2001	Better diagnostics: logging, agent list (contributors)
# 04-Jan-2001	First "New" version, which only delegates to
#		specialized hotplug agents.
#
# $Id: default.hotplug,v 1.4 2004/09/20 21:40:27 kroah Exp $
#

exec < /dev/null
test -t 1 || exec > /dev/null
test -t 2 || exec 2>&1

cd /etc/hotplug
. ./hotplug.functions

# DEBUG=yes export DEBUG

debug_mesg "arguments ($*) env (`env`)"

#
# Only one required argument:  event type type being dispatched.
# Examples:  usb, pci, isapnp, net, ieee1394, printer, disk,
# parport, input, ide, cpu, system, ... with 2.5, lots more.
# Other parameters are passed in the environment, or positionally
# through argv.
# 
if [ $# -lt 1 ] || [ "$1" = "help" ] || [ "$1" = "--help" ]; then
    if [ -t ]; then
	echo "Usage: $0 AgentName [AgentArguments]"

	AGENTS=""
	for AGENT in /etc/hotplug/*.agent ; do
	    TYPE=`basename $AGENT | sed s/.agent//`
	    if [ -x $AGENT ]; then
		AGENTS="$AGENTS $TYPE"
	    else
		AGENTS="$AGENTS ($TYPE)"
	    fi
	done
	echo "AgentName values on this system: $AGENTS" 
    else
	mesg "illegal usage $*"
    fi
    exit 1
fi

#
# Delegate event handling:
#   /sbin/hotplug FOO ..args.. ==> /etc/hotplug/FOO.agent ..args..
#
AGENT=/etc/hotplug/$1.agent
if [ -x $AGENT ]; then
    shift
    if [ "$DEBUG" != "" ]; then
	mesg "invoke $AGENT ($@)"
    fi
    exec $AGENT "$@"
    mesg "couldn't exec $AGENT"
    exit 1
fi

debug_mesg "no runnable $AGENT is installed"

#
# Optionally log events we don't handle directly.
# Some program or person has asked for $LOG data.
#
LOG=/var/log/hotplug/$1.events
if [ ! -w $LOG ]; then
    # catch-all for unclaimed events
    LOG=/var/log/hotplug/events
fi
if [ -w $LOG ]; then
    # record all basic event data
    HOTPLUG_TYPE=$1
    shift
    HOTPLUG_ARGS="$*"
    export HOTPLUG_ARGS HOTPLUG_TYPE

    # use to tempfile to buffer events
    # FIXME buffering acts oddly when logging to pipes,
    # it'd be better not to need a tempfile
    TMP=$(mktemp /var/log/hotplug/e-$HOTPLUG_TYPE-XXXXXXXX)
    if [ $? -ne 0 ]; then
	mesg "couldn't create tempfile for logging"
	exit 1
    fi

    debug_mesg "log to $LOG ($HOTPLUG_TYPE $HOTPLUG_ARGS)"
    log_to_stdout > $TMP
    cat $TMP >> $LOG
    rm -f $TMP

    exit 0
fi

exit 1