Path: utzoo!mnetor!uunet!lll-winken!lll-lcc!ames!eos!aurora!labrea!decwrl!hplabs!hpda!hpcupt1!hpisod2!decot
From: decot@hpisod2.HP.COM (Dave Decot)
Newsgroups: comp.unix.wizards
Subject: Re: Shared Memory in BSD4.3 is lacking?
Message-ID: <14020007@hpisod2.HP.COM>
Date: 28 Feb 88 21:18:22 GMT
References: <9100@ism780c.UUCP>
Organization: Hewlett Packard, Cupertino
Lines: 16

> So what's missing, or otherwise brain-damaged?  Much of the problem
> with the interface is that your program has to find and hook up to
> shared memory somehow, and the shared memory has to be able to
> stick around when unused.  The magic cookie approach seems
> reasonable.

But the cookies should be doled out by the file system, not by a
replication and distortion of the file system semantics.

There still is no useful way to generate appropriate magic cookies
under the "shmid" approach; ftok() is a self-admitted botch.

There should be a way to cause private shared memory segments
to vanish upon termination of a process or process group.

Dave Decot
hpda!decot