which errno should I use

[Wolfgang Denk]

Hi Ralph,

in message <3A76F163.406CBFDB at raleigh.ibm.com> you wrote:
>
> I am writing a character device driver.  I want this device driver to
> return an error if the user request less than say 1024 byte of data.
> What errno should I use?  Is it legal to return an error if not enouth

EINVAL (Invalid argument) is often used in this situation.

> bytes are requested?

Sure. Many character devices have certain restrictions on the I/O size.

Wolfgang Denk

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