Very Computer

by **Geoffrey Steeve** » Thu, 25 May 2000 04:00:00

I'm trying to create a device file like /dev/zero, except instead of
returning a zero I want the file to return the byte 255. I've read the
man and info pages on mknod, and everything is clear, but I don't know
anything about what major and minor number to use. ANy help would be
great. Thanks.

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Geoff Steeves // University of Alberta Physics //

http://www.ualberta.ca/~gsteeves
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by **Kari Pahul** » Thu, 25 May 2000 04:00:00

>I'm trying to create a device file like /dev/zero, except instead of
>returning a zero I want the file to return the byte 255. I've read the
>man and info pages on mknod, and everything is clear, but I don't know
>anything about what major and minor number to use. ANy help would be
>great. Thanks.

Device minor and major numbers just give information to the kernel
about the services requested. If you really want to have a device,
that returns 255's, you'd have to tinker with the kernel, since there
is no such service present in the kernel.

Are you sure you couldn't use a FIFO instead?

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