Date: Tue, 29 Jun 1999 14:18:30 +0930 From: Greg Lehey <grog@lemis.com> To: Patryk Zadarnowski <patrykz@mycenae.ilion.eu.org> Cc: Amol Mohite <amol2@m-net.arbornet.org>, freebsd-hackers@FreeBSD.ORG Subject: Re: environment strings Message-ID: <19990629141830.J85121@freebie.lemis.com> In-Reply-To: <199906290444.OAA30104@mycenae.ilion.eu.org>; from Patryk Zadarnowski on Tue, Jun 29, 1999 at 02:44:39PM %2B1000 References: <Pine.BSI.3.96.990628233126.24384A-100000@m-net.arbornet.org> <199906290444.OAA30104@mycenae.ilion.eu.org>
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On Tuesday, 29 June 1999 at 14:44:39 +1000, Patryk Zadarnowski wrote:
>
>> I know about envp.
>>
>> What I want to know is the exact position of these variables on the stack.
>>
>> and if anywhere I can find some data, on the exact compisoition of the
>> stcak, then it will be very helpful.
>>
>> references of books and websites wil be most helpful.
>
> Basically, i386 BSD kernels (you're after i386, aren't you?) point ESP to
> the following "struct" (which means that it will be dumped at the very
> top of the address space)
>
> struct kframe {
> int argc; /* "argc" to be passed to main() */
> char *argv[argc]; /* "argv" to be passed to main() */
> char *null; /* a NULL pointer terminating argv[] */
> char **envp; /* value to be assigned to "environ" */
> };
In fact, the environment strings are at the very top, followed by the
arguments, followed by this structure. But I suppose that's what you
meant to say.
Greg
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