linux udev 检测u盘的插入和拔出,[转]udev实现原理（含检测U盘拔插例子）
add@/devices/pci0000:00/0000:00:1d.1/usb2/2-1
add@/devices/pci0000:00/0000:00:1d.1/usb2/2-1/usbdev2.2_ep00
add@/devices/pci0000:00/0000:00:1d.1/usb2/2-1/2-1:1.0
add@/class/scsi_host/host2
add@/devices/pci0000:00/0000:00:1d.1/usb2/2-1/2-1:1.0/usbdev2.2_ep81
add@/devices/pci0000:00/0000:00:1d.1/usb2/2-1/2-1:1.0/usbdev2.2_ep02
add@/devices/pci0000:00/0000:00:1d.1/usb2/2-1/2-1:1.0/usbdev2.2_ep83
add@/class/usb_device/usbdev2.2
add@/devices/pci0000:00/0000:00:1d.1/usb2/2-1/2-1:1.0/host2/target2:0:0/2:0:0:0
add@/class/scsi_disk/2:0:0:0
add@/block/sda
add@/block/sda/sda1
add@/class/scsi_device/2:0:0:0
add@/class/scsi_generic/sg0
remove@/devices/pci0000:00/0000:00:1d.1/usb2/2-1/2-1:1.0/usbdev2.2_ep81
remove@/devices/pci0000:00/0000:00:1d.1/usb2/2-1/2-1:1.0/usbdev2.2_ep02
remove@/devices/pci0000:00/0000:00:1d.1/usb2/2-1/2-1:1.0/usbdev2.2_ep83
remove@/class/scsi_generic/sg0
remove@/class/scsi_device/2:0:0:0
remove@/class/scsi_disk/2:0:0:0
remove@/block/sda/sda1
remove@/block/sda
remove@/devices/pci0000:00/0000:00:1d.1/usb2/2-1/2-1:1.0/host2/target2:0:0/2:0:0:0
remove@/class/scsi_host/host2
remove@/devices/pci0000:00/0000:00:1d.1/usb2/2-1/2-1:1.0
remove@/class/usb_device/usbdev2.2
remove@/devices/pci0000:00/0000:00:1d.1/usb2/2-1/usbdev2.2_ep00
remove@/devices/pci0000:00/0000:00:1d.1/usb2/2-1
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