structure padding

[John Baldwin]

On Thursday 08 January 2004 04:28 pm, Dag-Erling Smørgrav wrote:
> John Baldwin <jhb at FreeBSD.org> writes:
> > Maybe:
> >
> > 	struct eproc {
> > 		union {
> > 			pid_t e_sid;
> > 			long e_oldspare;
> > 		}
> > 		long	e_spare[1];
> >
> > (I think gcc supports anonymous unions like that.)
>
> I thought about that, but it's butt-ugly...
>
> Does anyone have an Alpha running 4.x that I could test this on?
>
> > In 6.0 you could remove the union hack and change the ABI, assuming that
> > you want to put this in 5.x as well.
>
> 5.x has a completely different struct kinfo_proc which already
> contains the session id.

Actually, why not just use a long for the e_sid instead of pid_t?  A long will 
certainly fit a pid_t.  Doesn't hurt for it to be too big.  So just:

		char e_comm[]
		long e_sid;
		long e_spare;

-- 
John Baldwin <jhb at FreeBSD.org>  <><  http://www.FreeBSD.org/~jhb/
"Power Users Use the Power to Serve"  =  http://www.FreeBSD.org