From owner-freebsd-hackers  Mon Jun 28 19:18:15 1999
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To: freebsd-hackers@FreeBSD.ORG
Subject: Re: environment strings 
In-reply-to: Your message of "Tue, 29 Jun 1999 09:56:59 +0930."
             <19990629095659.B86806@freebie.lemis.com> 
Date: Tue, 29 Jun 1999 12:18:07 +1000
From: Patryk Zadarnowski <patrykz@mycenae.ilion.eu.org>
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> > I wanted t know where the environment strings i bsd were stored after a
> > program execs another one. 

extern char **environ;

> At the top of memory.  You can access them by the standard (but
> undocumented) method:
> 
> int main (int argc, char *argv [], char *envp [])
> 
> envp is a pointer to the environment strings.  This is true for every
> version of UNIX I know.

This is of course correct except for the `undocumented' claim. The `envp' has
been documented as the third argument to main() since the Pharaons (well, not
quite ;). Apparently AT&T UNIX even has a (documented) five-parameter main().

Besides, the `envp' argument is a recommended extension in ISO/ANSI C, so you
can hardly say that it's undocumented.

l8r,
patryk.


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