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D.6. /etc/rc.d/init.d/udev

#!/bin/sh
########################################################################
# Begin $rc_base/init.d/udev
#
# Description : Udev cold-plugging script
#
# Authors     : Zack Winkles, Alexander E. Patrakov
#
# Version     : 00.02
#
# Notes       :
#
########################################################################

. /etc/sysconfig/rc
. ${rc_functions}

case "${1}" in
    start)
        boot_mesg "Populating /dev with device nodes..."
        if ! grep -q '[[:space:]]sysfs' /proc/mounts; then
            echo_failure
            boot_mesg -n "FAILURE:\n\nUnable to create" ${FAILURE}
            boot_mesg -n " devices without a SysFS filesystem"
            boot_mesg -n "\n\nAfter you press Enter, this system"
            boot_mesg -n " will be halted and powered off."
            boot_mesg -n "\n\nPress Enter to continue..." ${INFO}
            boot_mesg "" ${NORMAL}
            read ENTER
            /etc/rc.d/init.d/halt stop
        fi

        # Mount a temporary file system over /dev, so that any devices
        # made or removed during this boot don't affect the next one.
        # The reason we don't write to mtab is because we don't ever
        # want /dev to be unavailable (such as by `umount -a').
        if ! mountpoint /dev > /dev/null; then
            mount -n -t tmpfs tmpfs /dev -o mode=755
        fi
        if [ ${?} != 0 ]; then
            echo_failure
            boot_mesg -n "FAILURE:\n\nCannot mount a tmpfs" ${FAILURE}
            boot_mesg -n " onto /dev, this system will be halted."
            boot_mesg -n "\n\nAfter you press Enter, this system"
            boot_mesg -n " will be halted and powered off."
            boot_mesg -n "\n\nPress Enter to continue..." ${INFO}
            boot_mesg "" ${NORMAL}
            read ENTER
            /etc/rc.d/init.d/halt stop
        fi

        # Udev handles uevents itself, so we don't need to have
        # the kernel call out to any binary in response to them
        echo > /proc/sys/kernel/hotplug

        # Copy the only static device node that Udev >= 155 doesn't
        # handle to /dev
        cp -a /lib/udev/devices/null /dev

        # Start the udev daemon to continually watch for, and act on,
        # uevents
        /sbin/udevd --daemon

        # Now traverse /sys in order to "coldplug" devices that have
        # already been discovered
        /sbin/udevadm trigger --action=add

        # Now wait for udevd to process the uevents we triggered
        /sbin/udevadm settle
        evaluate_retval

        ;;

    *)
        echo "Usage ${0} {start}"
        exit 1
        ;;
esac

# End $rc_base/init.d/udev

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