1 /*********************************************************************** 2 * * 3 * This software is part of the ast package * 4 * Copyright (c) 1985-2007 AT&T Knowledge Ventures * 5 * and is licensed under the * 6 * Common Public License, Version 1.0 * 7 * by AT&T Knowledge Ventures * 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 28 NoN(dup2) 29 30 #else 31 32 #include <error.h> 33 34 int 35 dup2(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