On Wed, 20 Dec 2000, Rajesh Fowkar wrote:
> Thanks sojan for making the difference clear.
> Where can you find the major and minor numbers for kernel modules.
>
Should this thread be moved to programming?
In the kernel modules, the major number is indicated while registering the
device
for ex: register_chrdev(major_number,"my_device",&fops);
The kernel does not differentiate between minor numbers. When any process,
access a device with the major number my driver registered, the
corresponding entry point in my driver will be called. It is the driver's
responsibility to take care of differences in minor number.
device file entries are special files, which specify a major and minor
number..
ls -l /dev/hda*
brw-rw-rw- 1 root disk 3, 0 May 6 1998 /dev/hda
brw-rw-rw- 1 root disk 3, 1 May 6 1998 /dev/hda1
brw-rw---- 1 root disk 3, 10 May 6 1998 /dev/hda10
brw-rw---- 1 root disk 3, 11 May 6 1998 /dev/hda11
brw-rw---- 1 root disk 3, 12 May 6 1998 /dev/hda12
The major number of the hd driver is 3. The minor numbers are 0,1.... etc
etc. Note that the device entry can have any name, as long as the major
and minor numbers match.
Regards
Soj.
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