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Date:	Mon, 3 Jun 2002 13:21:30 -0500
From:	Michael Potter <pottmi AT lidp DOT com>
To:	cygwin AT cygwin DOT com
Subject:	Re: numerous bugs i've found in cygwin while developing XEmacs
Message-ID:	<20020603132129.H269776@lidp.com>
Reply-To:	pottmi AT lidp DOT com
Mime-Version:	1.0
User-Agent:	Mutt/1.3.19i
Organization:	Life Insurance Data Processing Incorporated
Phone:	+1 630 829 7015

> >[1] mmap[] and fork[].  The "pdump" [portable dumper] method of
> > implementing undumping for XEmacs writes out all the data into
> > a large file during building, and then reads it in when the
> > program starts.  the file looks like this:
> >-rw-r--r--    1 Ben Wing None      3280684 Jun  2 02:58 xemacs.dmp
> >
> >if mmap support exists, it's loaded using mmap[].  This fails
> > miserably when a fork[] happens, as the child evidently doesn't
> > get the mmap[]ed data visible in it and thus seg faults occur.
>
> This is obviously not supposed to be the way things work.  It
> can't be as simple as "mmap doesn't work across forks".

It could be as simple as the example I submitted last night.
That submission includes a sample program.

June 02, 2002 20:32
cygwin 1.3.10 fork+sockets+shmat/mmap=recreate_mmaps_after_fork_failed

The sample uses shmat, but if someone is willing to work on it,
I would be happy to submit the example using mmap.

-- 
Michael Potter
LIDP Consulting Inc.

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