Re: [PATCH 6/6] libxl: vncviewer: make autopass work properly

[Ian Jackson <Ian.Jackson@eu.citrix.com>]

Stefano Stabellini writes ("Re: [Xen-devel] [PATCH 6/6] libxl: vncviewer: make autopass work properly"):
> On Tue, 1 Feb 2011, Ian Jackson wrote:
> > +        if ( autopass_fd < 0 ) {
> > +            LIBXL__LOG_ERRNO(ctx, LIBXL__LOG_ERROR,
> > +                             "mkstemp %s failed", tmpname);
> > +            exit(-1);
> > +        }
> 
> I don't think we should call exit here, this is a library not an
> executable. However instead of just skipping autopass we should avoid
> exec'ing vncviewer completely and return and error.

The caller must already tolerate the function simply causing the
process to die, because execve can fail like that.  Ie,
libxl_exec_vncviewer is already called only after fork.  So it seemed
best to have the function always fail the same way.

If we had a function which merely returned the vnc connection info, I
would agree with you that it shouldn't exit.  We should do that in 4.2.

Ian.