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From: carroll@snail.UUCP
Newsgroups: comp.lang.c
Subject: Re: MSC-all C's
Message-ID: <10700001@snail>
Date: Fri, 13-Nov-87 11:21:00 EST
Article-I.D.: snail.10700001
Posted: Fri Nov 13 11:21:00 1987
Date-Received: Mon, 23-Nov-87 01:51:38 EST
References: <3094@rosevax.Rosemount.COM>
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Nf-ID: #R:rosevax.Rosemount.COM:3094:snail:10700001:000:370
Nf-From: snail.CS.UIUC.EDU!carroll    Nov 13 10:21:00 1987


	In most compilers, a certain register on the processor is used to
hold return values. When it is assigned, it is moved out of the register
and into the appropriate variable, or tested (as in if(open(...) < 0)). If
it is not used, then the value in the register is just overwritten next time
it's used. On '86 CPU's, it's usually ax, on most PDP style machines it's r0.