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Date: 20 May 2004 08:21:31 +0200
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From: Eli Zaretskii <eliz AT gnu DOT org>
To: djgpp AT delorie DOT com
In-reply-to: <4d201f78.0405191847.6697f90d@posting.google.com>
	(048321887-0001 AT t-online DOT de)
Subject: Re: Using DR-DOS fork in DJGPP
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> From: 048321887-0001 AT t-online DOT de (Udo Kuhnt)
> Newsgroups: comp.os.msdos.djgpp
> Date: 19 May 2004 19:47:50 -0700
> 
> Well, I am curious - I heard that the DJGPP C library has been developed from
> one for FreeBSD, or something like that, which probably has a working fork
> sys call. Is this code still present in DJGPP and could it be reactivated, or
> has it been removed because it did not seem useful?

The first version of the library was a hacked libc from ISC Unix,
followed by a ported BSD library (for more about that, see
http://www.delorie.com/djgpp/history.html).  However, the library was
rewritten from scratch during development of DJGPP v2.0, so all traces
of Unix are mostly gone now.

In any case, there would be no sense in keeping any code from the Unix
`fork', as `fork' is a system call on Unix systems, implemented
entirely in the kernel, and so not really visible in the library
sources.  By contrast, a DJGPP implementation would need to be part of
the library.

I've read the description of the Caldera multitasking API, but
there's one thing I'm not sure I understood: when an application
calls the X_PCreate function to create a new process, what program is
executing in that process?  Is that the same program as the one which
called X_PCreate, and if so, is its memory really a copy of the
calling process's memory, as it should be under `fork' semantics?

Also, does the child process inherit the file handles from the parent?