how to create device file

[rajkumarmadhani]

Hi,

I am having doubt on how to create device file for usb.
and how to assign major no to it.
could anybody please tell me this.

thanx in advance

[hazel]

If you've got kernel source, you can look in the file devices.txt. This contains major nodes for all devices. You might also find the man page for MAKEDEV useful.

[rajkumarmadhani]

hi hazel,
thank you for reply, but in my system iam not having kernel source code.
i seen code for usb on www.lxr.linux.no & i successfully compiled sample code usb-skeleton.c. But i got struct at creating device file for it.

[hazel]

Try http://www.lanana.org/docs/device-list/devices.txt.

[rajkumarmadhani]

thank u i will go through that & get back to you

[vijay_kernel]

Hi,

We create a device node by using the command "mknod".

Instead of assigning a major number explicitly, go for dynamic allocation of the major number which assigns the free major number.