Matt Koss wrote:
> 
> I want to implement rollback in kio_file.
> This means, that when the transfer is interrupted, slave will take some bytes
> from the end of the file and put them away.
> Later, when resumed, this will make sure that there is not any trailing garbage.
> 
> But what's the easiest thing to achieve it ?
> 
> Is there some simple method for cutting some data from the end of the local
> file ?

Yes. truncate() is your friend. Not sure if it is defined by POSIX. 
See your local man page.

Cheers,
Waldo
-- 
The "gui" in "Penguin" is pronounced "K-D-E"