1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD 3 * 4 * Copyright (c) 2012 Jukka A. Ukkonen 5 * All rights reserved. 6 * 7 * This software was developed by Jukka Ukkonen for FreeBSD. 8 * 9 * Redistribution and use in source and binary forms, with or without 10 * modification, are permitted provided that the following conditions 11 * are met: 12 * 1. Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 14 * 2. Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in the 16 * documentation and/or other materials provided with the distribution. 17 * 18 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 19 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 21 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 22 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 24 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 25 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 26 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 27 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 28 * SUCH DAMAGE. 29 * 30 * $FreeBSD: head/lib/libc/gen/dup3.c 326193 2017-11-25 17:12:48Z pfg $ 31 */ 32 33 #include "namespace.h" 34 #include <unistd.h> 35 #include <fcntl.h> 36 #include <errno.h> 37 #include "un-namespace.h" 38 39 int __dup3(int, int, int); 40 41 int 42 __dup3(int oldfd, int newfd, int flags) 43 { 44 int how; 45 46 if (oldfd == newfd) { 47 errno = EINVAL; 48 return (-1); 49 } 50 51 if (flags & ~O_CLOEXEC) { 52 errno = EINVAL; 53 return (-1); 54 } 55 56 how = (flags & O_CLOEXEC) ? F_DUP2FD_CLOEXEC : F_DUP2FD; 57 58 return (_fcntl(oldfd, how, newfd)); 59 } 60 61 __weak_reference(__dup3, dup3); 62 __weak_reference(__dup3, _dup3); 63