Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP Posting-Version: version B 2.10.1 6/24/83; site burl.UUCP Path: utzoo!watmath!clyde!burl!rcj From: rcj@burl.UUCP (R. Curtis Jackson) Newsgroups: net.sources Subject: public domain dup2() should work on most Unix systems Message-ID: <551@burl.UUCP> Date: Tue, 9-Oct-84 19:50:22 EDT Article-I.D.: burl.551 Posted: Tue Oct 9 19:50:22 1984 Date-Received: Wed, 10-Oct-84 05:12:42 EDT Organization: AT&T Technologies; Burlington, NC Lines: 41 /* * Public domain dup2() lookalike * by Curtis Jackson @ AT&T Technologies, Burlington, NC * electronic address: burl!rcj * * dup2 performs the following functions: * * Check to make sure that fd1 is a valid open file descriptor. * Check to see if fd2 is already open; if so, close it. * Duplicate fd1 onto fd2; checking to make sure fd2 is a valid fd. * Return fd2 if all went well; return BADEXIT otherwise. */ # define BADEXIT -1 # includeextern int errno; dup2(fd1, fd2) int fd1, fd2; { if (fcntl(fd1,F_GETFL) < 0) { return(BADEXIT); } if (fcntl(fd2,F_GETFL) >= 0) { close(fd2); } if (fcntl(fd1,F_DUPFD,fd2) < 0) { return(BADEXIT); } return(fd2); } -- The MAD Programmer -- 919-228-3313 (Cornet 291) alias: Curtis Jackson ...![ ihnp4 ulysses cbosgd mgnetp ]!burl!rcj ...![ ihnp4 cbosgd akgua masscomp ]!clyde!rcj