how can i create a device like /dev/zero?
 

Hello,
how can write a device like /dev/zero that willl output instead of zeroes ones and will be /dev/one.
Also where can i find /dev/zero source code?
thans.

have you heard about the program called yes?










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I was under the impression that /dev/zero, like /dev/null, was an output-only thing?

what is the program Yes? and yeah they are an output devices.. what it has to do wuth the question?
edit: yes doesnt work out for me.. i want to create an actual device

yes is not a device, but a simple program.
Here is a tutorial on creating a basic char device: http://learninglinuxkernel.com/Basic...Driver_07.html






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"yes" doesnt workout for me i want to create a device similliar to /dev/zero that will output 1's

does anyone knows where /dev/zero source code is located?

I gave you a link about how to create a simple device. Have you tried?

Well, you can write to them--they're just no-error data sinks. /dev/null doesn't do output though which is kinda why we like /dev/zero which you can read null bytes from.


noone234, what you want is to create a character device as pan64 indicated. A complete test program is provided at the end of the linked page.

Please mark this thread as solved if you are satisfied with that answer.

Edit:
Realized input/output might be confusing. By output I mean "read-from".