mark-zhaofei / udev-examples

libudev API examples

udev-examples

libudev API examples

• udev_example1.c: using libudev API we get basic information for network device 'eth0'.

example:

    [user@linux ~]$ ./udev_example1 eth0
    I: DEVNAME=eth0
    I: DEVPATH=/devices/pci0000:00/0000:00:19.0/net/eth0
    I: MACADDR=18:03:73:db:c3:31
    I: DRIVER=e1000

• udev_example2.c: using libudev API we enumerate all devices under 'block' subsystem that are not 'partitions' or 'loop' devices.

example:

    [user@linux ~]$ ./udev_example2
    I: DEVNODE=/dev/sda
    I: KERNEL=sda
    I: DEVPATH=/devices/pci0000:00/0000:00:1f.2/ata1/host0/target0:0:0/0:0:0:0/block/sda
    I: DEVTYPE=disk
    I: DEVSIZE=500 GB
    I: DEVNODE=/dev/sr0
    I: KERNEL=sr0
    I: DEVPATH=/devices/pci0000:00/0000:00:1f.2/ata2/host1/target1:0:0/1:0:0:0/block/sr0
    I: DEVTYPE=disk
    I: DEVSIZE=n/a

• udev_example3.c: using libudev API we monitor 'net' subsystem for events.

example:

    [user@linux ~]$ ./udev_example3
    I: ACTION=remove
    I: DEVNAME=net0
    I: DEVPATH=/devices/pci0000:00/0000:00:19.0/net/net0
    I: MACADDR=(null)
    ---
    I: ACTION=add
    I: DEVNAME=net0
    I: DEVPATH=/devices/pci0000:00/0000:00:19.0/net/net0
    I: MACADDR=d4:be:d9:2b:86:7c