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#!/bin/sh
# SPDX-License-Identifier: Apache-2.0
# Copyright (C) 2026 Dante <dante@seckv.com>
#
# Hotplug event trigger script for LinkBack daemon.
# Instantly wakes up linkbackd on interface ifup/ifdown state changes.
[ "$ACTION" = "ifup" ] || [ "$ACTION" = "ifdown" ] || exit 0
[ -n "$INTERFACE" ] || exit 0
# Check if linkbackd is running
PID=$(pidof linkbackd)
[ -n "$PID" ] || exit 0
# Send SIGUSR1 to trigger immediate health check / short-circuit
kill -USR1 $PID 2>/dev/null