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