udev-examples's Introduction

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

License

uprg is free software made available under the GPL2. For details see the LICENSE file.

udev-examples's People

Contributors

Stargazers

Watchers

udev-examples's Issues

how to get header

#include <libudev.h>

not compiling for me

example3 doesn't respond to network change

Hi Robert,

I was playing with udev_example3.c but the program doesn't print out anything if I disconnect/reconnect the wireless network.

Debug shows that the problem is at L55. (ret is equal to 0)

ret = select(fd+1, &fds, NULL, NULL, &tv);

[Question] What is a 'enumerate object' ?

First of all, thanks for sharing your udev knowledge through these examples! Those are very helpful!!

Second, I'm asking this question because I did not find the de definition of 'enumerate object' in any udev documentation. If you don't mind, can explain the purpose at udev_example2.c?

Recommend Projects