Major and minor numbers

On Nov 27, 2013 3:49 PM, "Sudip Mukherjee" [off-list ref]
wrote:

On Tue, Nov 26, 2013 at 4:36 PM, Nav Kamal [off-list ref] wrote:

quoted

Am a little stuck at major and minor numbers used to reference the

connection between device file and device driver. Can please somebody
theoretically explain how they work ?

In my opinion major and minor number are like device identifier. The

combination of major and minor number (dev_t) is the deviceid. The major
number is like an id of your driver. And all the devices that are using
this driver will be having their own minor numbers. No two devices can have
the same minor number if they are being controlled by the same driver. So
when you create a device node , you specify the major and minor number with
mknod command , and that means that particular node is associated with the
driver (recognized by major number) and a particular device (recognized by
the minor number).

Did i explain correctly or is my understanding wrong ???

Regards
Sudip

Thanks , yes its correct . Finally understood the concept.
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