File manager - Edit - /usr/lib/udev/ifupdown-hotplug
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#!/bin/sh -e # # run /sbin/{ifup,ifdown} with the --allow=hotplug option. # PATH='/sbin:/bin:/usr/sbin:/usr/bin' if [ -x /usr/bin/logger ]; then LOGGER=/usr/bin/logger elif [ -x /bin/logger ]; then LOGGER=/bin/logger else unset LOGGER fi # for diagnostics if [ -t 1 -a -z "$LOGGER" ] || [ ! -e '/dev/log' ]; then mesg() { echo "$@" >&2 } elif [ -t 1 ]; then mesg() { echo "$@" $LOGGER -t "${0##*/}[$$]" "$@" } else mesg() { $LOGGER -t "${0##*/}[$$]" "$@" } fi if [ -z "$INTERFACE" ]; then mesg "Bad ifupdown udev helper invocation: \$INTERFACE is not set" exit 1 fi check_program() { [ -x $1 ] && return 0 mesg "ERROR: $1 not found. You need to install the ifupdown package." mesg "ifupdown udev helper $ACTION event for $INTERFACE not handled." exit 1 } wait_for_interface() { local interface=$1 local state while :; do read state /sys/class/net/$interface/operstate 2>/dev/null || true if [ "$state" != down ]; then return 0 fi sleep 1 done } net_ifup() { check_program /sbin/ifup # exit if the interface is not configured as allow-hotplug TARGET_IFACE=$(/sbin/ifquery --allow hotplug -l "$INTERFACE" || true) if [ -z "$TARGET_IFACE" ]; then exit 0 fi if [ -d /run/systemd/system ]; then exec systemctl --no-block start $(systemd-escape --template ifup@.service $TARGET_IFACE) fi wait_for_interface lo exec ifup --allow=hotplug $INTERFACE } net_ifdown() { check_program /sbin/ifdown # systemd will automatically ifdown the interface on device # removal by binding the instanced service to the network device if [ -d /run/systemd/system ]; then exit 0 fi exec ifdown --allow=hotplug $INTERFACE } do_everything() { case "$ACTION" in add) # these interfaces generate hotplug events *after* they are brought up case $INTERFACE in ppp*|ippp*|isdn*|plip*|lo|irda*|ipsec*) exit 0 ;; esac net_ifup ;; remove) # the pppd persist option may have been used, so it should not be killed case $INTERFACE in ppp*) exit 0 ;; esac net_ifdown ;; *) mesg "NET $ACTION event not supported" exit 1 ;; esac } # under systemd we don't do synchronous operations, so we can run in the # foreground; we also need to, as forked children get killed right away under # systemd if [ -d /run/systemd/system ]; then do_everything else # under sysvinit we need to fork as we start the long-running # "ifup". but there, forked processes won't get killed. # When udev_log="debug" stdout and stderr are pipes connected to udevd. # They need to be closed or udevd will wait for this process which will # deadlock with udevsettle until the timeout. exec > /dev/null 2> /dev/null do_everything & fi
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