Path: utzoo!attcan!uunet!lll-winken!ames!haven!adm!xadmx!mark@spider.co.uk
From: mark@spider.co.uk (Mark Valentine)
Newsgroups: comp.unix.questions
Subject: Question about dup()
Message-ID: <19538@adm.BRL.MIL>
Date: 10 May 89 11:20:19 GMT
Sender: news@adm.BRL.MIL
Lines: 19

I came across the following code fragment, and was wondering about its
history...  It's not mentioned in any of the manuals I've looked at.

        #define DUPFLG  0100

	    ...

        dup(f1 | DUPFLG, f2);

There was some parallel code (the other half of an #ifdef RES) which used
a F_GETFD/F_DUPFD/F_SETFD sequence instead, so I guess that this must be
somebody's way of saving the close-on-exec flag across a dup.

	Can anyone offer some enlightenment?

		Mark.
__
Mark Valentine, Spider Systems Limited, Edinburgh, UK.		/\oo/\
<mark@spider.co.uk, mark%spider.co.uk@uunet.uu.net, uunet!mcvax!ukc!spider!mark>