Re: netbsd-5: panic: ureadc: non-positive resid

[David Laight <david%l8s.co.uk@localhost>]

On Sun, Oct 11, 2009 at 01:18:33AM -0400, Matthew Mondor wrote:
> Under some circumstances, the following panic occurs:
> panic: ureadc: non-positive resid
> 
> Interestingly, I've been able to reproduce it in the following peculiar
> way.
> 
> Using a program such as:
> 
> #include <sys/types.h>
> #include <sys/uio.h>
> #include <unistd.h>
> 
> int main(void)
> {
>       struct iovec iov[1];
>       char buffer[1024];
> 
>       iov[0].iov_base = buffer;
>       iov[0].iov_len = 0;
> 
>       return preadv(0, iov, 1, 0);
> }
> 
> which of course, normally fails with EINVAL.

On my system (currentish i386 kernel) all the read calls return
immediately with 0.
Doesn't matter whether in the console, a pty or screen (probably a pty).

        David

-- 
David Laight: david%l8s.co.uk@localhost