1/*********************************************************************** 2* * 3* This software is part of the ast package * 4* Copyright (c) 1985-2011 AT&T Intellectual Property * 5* and is licensed under the * 6* Common Public License, Version 1.0 * 7* by AT&T Intellectual Property * 8* * 9* A copy of the License is available at * 10* http://www.opensource.org/licenses/cpl1.0.txt * 11* (with md5 checksum 059e8cd6165cb4c31e351f2b69388fd9) * 12* * 13* Information and Software Systems Research * 14* AT&T Research * 15* Florham Park NJ * 16* * 17* Glenn Fowler <gsf@research.att.com> * 18* David Korn <dgk@research.att.com> * 19* Phong Vo <kpv@research.att.com> * 20* * 21***********************************************************************/ 22#pragma prototyped 23 24#include <ast.h> 25 26#if _lib_dup2 27 28NoN(dup2) 29 30#else 31 32#include <error.h> 33 34int 35dup2(int d1, int d2) 36{ 37 int save_errno; 38 39 if (d1 == d2) return(d1); 40 save_errno = errno; 41 close(d2); 42 errno = save_errno; 43 return(fcntl(d1, F_DUPFD, d2)); 44} 45 46#endif 47