Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP
Posting-Version: version B 2.10.2 9/5/84; site rexago1.UUCP
Path: utzoo!watmath!clyde!burl!ulysses!gamma!epsilon!zeta!sabre!petrus!bellcore!decvax!cwruecmp!rexago1!rich
From: rich@rexago1.UUCP (K. Richard )
Newsgroups: net.lang.c,net.unix
Subject: return, exit, _exit summary
Message-ID: <186@rexago1.UUCP>
Date: Wed, 5-Feb-86 12:30:44 EST
Article-I.D.: rexago1.186
Posted: Wed Feb  5 12:30:44 1986
Date-Received: Fri, 7-Feb-86 20:36:51 EST
Distribution: net
Organization: Roadway Express Inc., Akron, OH
Lines: 17
Xref: watmath net.lang.c:7778 net.unix:7032

My original query:
>I'm on a binary only 3b2/300 running SV.2.2 so...
>What's the difference between leaving main by return() vs exit() vs _exit()?
>I mean in reality, by proposed standards (X3J11 can you hear me?), and
>functionally (like on my machine).  Who closes file descriptors?  Who reclaims
>memory?  What about shared memory?  What is a gate 4, 8?

It seems that return & exit both place exit status on the stack and allow the
process to die.  _exit does the same thing but does not flush io buffers.
Cleanup, ie, open files, semaphores, and shared memory segments are cleaned up
by the kernal when a process dies.

Thanks to all who shared.

K. Richard Magill

ps, the gate is a kernal call on a 3b2.