[Bug 1102] C program 'write' with zero length hangs

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http://bugzilla.mindrot.org/show_bug.cgi?id=1102





------- Comment #17 from sethi.varun at gmail.com  2006-11-17 07:46 -------
(In reply to comment #16)
> (In reply to comment #12)
> > Created an attachment (id=1147)
 --> (http://bugzilla.mindrot.org/attachment.cgi?id=1147&action=view) [details] [details]
> > Handle zero-length reads on AIX only
> > I was wondering if there's any platforms out there that don't set
> > errno... so this ought to be safer (although admittedly uglier).
> > Unless there are objections I'd like to commit this one
> Shouldn't the fix in channels.c 
> +#ifndef PTY_ZEROREAD
>                 if (len <= 0) {
> +#else
> +               if (len < 0 || (len == 0 && errno != 0)) {
> +#endif
> Actuall be 
> +#ifdef PTY_ZEROREAD
>                 if (len <= 0) {
> +#else
> +               if (len < 0 || (len == 0 && errno != 0)) {
> +#endif
> After applying the modified (changing ifndef to ifdef in channels.c)
> fix on AIX. The problem of ssh session hang is resolved. But now I face
> another problem on AIX. 
> Task: Login with ssh WITH the -X or -Y option and start and ending wish
> and trying to logout
> Result: DISPLAY variable correctly set. After ending wish and trying to
> logout from the ssh shell the shell displayed: logout and then hangs
> there. The hanging ssh shell must be ended with CRTL-C
> Steps to reproduce:
> client  prompt$ ssh -X server
> server  prompt$ wish
>      wish prompt: exit
> server prompt $ exit
>    logout

Forgot to mention that I applied tha patch on openssh-4.1




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