Re: [Xen-devel] Re: [Xen-changelog] [xen-unstable] xenstored: Do not write to stderr if we are daemonised!

["Daniel P. Berrange" <berrange@xxxxxxxxxx>]

On Wed, Aug 01, 2007 at 07:03:23PM +0100, John Levon wrote:
> On Wed, Aug 01, 2007 at 09:53:17AM -0700, Xen patchbot-unstable wrote:
> 
> > +
> > +           /* Get ourselves a nice xenstored crash if these are used. */
> > +           stdin = NULL;
> > +           stdout = NULL;
> > +           stderr = NULL;
> 
> You cannot assign to std* on Solaris, this becomes:
> 
>  (&__iob[0]) = 0;
>  (&__iob[1]) = 0;
>  (&__iob[2]) = 0;
> 
> which obviously won't compile.

Yep, rather than closing FD's and setting the FILE* to NULL, the daeon
code should re-open /dev/null for stdin/out/err which is the traditional
approach for most UNIX daemons.

        if (dofork) {
                int devnull;
                devnull = open(_PATH_DEVNULL, O_RDWR);
                close(STDIN_FILENO);
                close(STDOUT_FILENO);
                close(STDERR_FILENO);
                dup2(devnull, STDIN_FILENO);
                dup2(devnull, STDOUT_FILENO);
                dup2(devnull, STDERR_FILENO);
                close(devnull);
        }

(With error checking on open/close/dup2 of ccourse)

Regards,
Dan.
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