Date: Sun, 3 Mar 2002 20:20:20 -0500 From: Brian T.Schellenberger <bts@babbleon.org> To: Erik Trulsson <ertr1013@student.uu.se>, Ian <freebsd@damnhippie.dyndns.org> Cc: freebsd-hackers <freebsd-hackers@FreeBSD.ORG> Subject: Re: A few questions about a few includes Message-ID: <20020304012020.A1681BA05@i8k.babbleon.org> In-Reply-To: <20020303180029.GA56041@student.uu.se> References: <XFMail.20020303091938.conrads@cox.net> <B8A7AB05.AAE6%freebsd@damnhippie.dyndns.org> <20020303180029.GA56041@student.uu.se>
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On Sunday 03 March 2002 01:00 pm, Erik Trulsson wrote:
> On Sun, Mar 03, 2002 at 10:27:17AM -0700, Ian wrote:
> > > In <sys/proc.h>:
> > >
> > > /*
> > > * pargs, used to hold a copy of the command line, if it had a sane
> > > * length
> > > */
> > > struct pargs {
> > > u_int ar_ref; /* Reference count */
> > > u_int ar_length; /* Length */
> > > u_char ar_args[0]; /* Arguments */
> > > };
>
> It might be worth mentioning that this trick is not actually allowed
> according to the C standard and in principle invokes undefined
> behaviour. OTOH, AFAIK the trick does work on all existing compilers,
> so while it is not standard-conforming it is quite portable.
I can't even imagine how one *would* write a compiler where this would
fail--does anybody know the putative risk that led ANSI to "ban" this (IMHO)
perfectly-reasonable bahvior?
--
Brian T. Schellenberger . . . . . . . bts@wnt.sas.com (work)
Brian, the man from Babble-On . . . . bts@babbleon.org (personal)
ME --> http://www.babbleon.org
http://www.eff.org <-- GOOD GUYS --> http://www.programming-freedom.org
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