linux下U盘和SD卡的热拔插检测

在Linux中，可以使用udev（Linux设备管理器）来检测U盘的插入和拔出事件。udev是一个用于管理和监控设备的子系统，它可以通过监视内核事件来触发相应的操作。创建一个udev规则文件

10-usb.rules脚本如下

KERNEL=="sd[a-z]*",RUN+="/etc/udev/usb-hotplug.sh %k"

11-sd.rules脚本如下

KERNEL=="mmcblk[0-9]p[0-9]",RUN+="/etc/udev/sd-hotplug.sh %k"

 sd-hotplug.sh脚本内容如下

#!/bin/sh

CONSOLE=/dev/ttyS0
dev=$1
mount_path=/tmp/sd

if [ $ACTION == "add" ]; then
        if [ ! -d $mount_path ]; then
                echo "+++sd add: $dev+++" > ${CONSOLE}
                mkdir $mount_path
                mount -t vfat /dev/$dev $mount_path
                if [ $? != 0 ]; then
                        rmdir $mount_path
                fi
        fi
elif [ $ACTION == "remove" ]; then
        if [ -d $mount_path ]; then
                echo "---sd del: $dev---" > ${CONSOLE}
                umount -l $mount_path
                rmdir $mount_path
        fi
fi

usb-hotplug.sh脚本内容如下

#!/bin/sh

CONSOLE=/dev/ttyS0
dev=$1
mount_path=/tmp/usb

if [ $ACTION == "add" ]; then
        if [ ! -d $mount_path ]; then
                echo "+++usb add: $dev+++" > ${CONSOLE}
          

                if [ -e /dev/${dev}1 ]; then
                        part=1
                fi
                mkdir $mount_path
                mount -t vfat /dev/$dev$part $mount_path
                if [ $? != 0 ]; then
                        rmdir $mount_path
                fi
        fi

elif [ $ACTION == "remove" ]; then
        if [ -d $mount_path ]; then
                echo "---usb del: $dev---" > ${CONSOLE}
                umount -l $mount_path
                rmdir $mount_path
        fi
fi