Path: utzoo!utgpu!news-server.csri.toronto.edu!torsqnt!hybrid!chance!john
From: john@chance.UUCP (John R. MacMillan)
Newsgroups: comp.sys.3b1
Subject: Re: want workaround for "dup2"
Keywords: dup2 3b1 unix-pc
Message-ID: <1991Mar19.053708.8792@chance.UUCP>
Date: 19 Mar 91 05:37:08 GMT
References: <1270@hico2.UUCP> <1991Mar18.024543.20223@texrex.uucp>
Organization: Haphazard
Lines: 13

|>Is there an easy way to provide dup2?
|
|#include<fcntl.h>
|	...
    if (fd_to_dup != fd) {
|	close(fd_to_dup);
|	newfd=fcntl(fd, F_DUPFD, fd_to_dup);
    }
|	...

I'm not sure this is perfect, in particular I'm not sure errno will
agree with dup2(), but it's pretty close.  The check to see if the
fd's are equal isn't always necessary, but when it is...