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From: guy@gorodish.UUCP
Newsgroups: comp.unix.wizards
Subject: Re: shared memory in BSD 4.2
Message-ID: <12653@sun.uucp>
Date: Tue, 3-Feb-87 16:28:37 EST
Article-I.D.: sun.12653
Posted: Tue Feb  3 16:28:37 1987
Date-Received: Wed, 4-Feb-87 19:14:17 EST
References: <4200@brl-adm.ARPA>
Sender: news@sun.uucp
Reply-To: guy@sun.UUCP (Guy Harris)
Organization: Sun Microsystems, Mountain View
Lines: 10

>I have tracked down mmap and munmap but cannot figure out how to get the
>file descriptor of my own core image to pass to mmap.

You can't.  "mmap" doesn't do anything on vanilla 4.[23]BSD.  Some
implentations using 4.[23]BSD code  support it to varying degrees.

Even if it did, there is still no way to *get* a file descriptor that
refers to your own core image.  You probably wouldn't want one,
anyway; you'd want to pick a file to use to hold the shared data and
"mmap" that file into both your address spaces.