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From: gwyn@smoke.BRL.MIL (Doug Gwyn)
Newsgroups: comp.unix.questions
Subject: Re: Question about dup()
Message-ID: <10247@smoke.BRL.MIL>
Date: 10 May 89 14:17:41 GMT
References: <19538@adm.BRL.MIL>
Reply-To: gwyn@brl.arpa (Doug Gwyn)
Organization: Ballistic Research Lab (BRL), APG, MD.
Lines: 7

In article <19538@adm.BRL.MIL> mark@spider.co.uk (Mark Valentine) writes:
>        dup(f1 | DUPFLG, f2);

That was an early implementation of what we now know of as dup2(f1,f2)
or close(f2),fcntl(f1,F_DUPFD,f2).  dup2() is still sometimes actually
implemented that way in the system call interface, but user code should
use one of the officially approved methods.