openwrt hotplug

cat /proc/sys/kernel/hotplug

/sbin/hotplug

cat /sbin/hotplug-call

#!/bin/sh
# Copyright (C) 2006-2010 OpenWrt.org

export HOTPLUG_TYPE="$1"

. /lib/functions.sh

PATH=/usr/sbin:/usr/bin:/sbin:/bin
LOGNAME=root
USER=root
export PATH LOGNAME USER
export DEVICENAME="${DEVPATH##*/}"

[ \! -z "$1" -a -d /etc/hotplug.d/$1 ] && {
        for script in $(ls /etc/hotplug.d/$1/* 2>&-); do (
                [ -f $script ] && . $script
        ); done
}

调试某个设备上报的事件：

export DBGLVL=10; procd -h /etc/hotplug.json