1 /* $NetBSD: compat_dup3.c,v 1.2 2024/05/20 01:33:40 christos Exp $ */ 2 3 /*- 4 * Copyright (c) 2024 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to The NetBSD Foundation 8 * by Christos Zoulas. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 21 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 22 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 23 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 29 * POSSIBILITY OF SUCH DAMAGE. 30 */ 31 #include <sys/cdefs.h> 32 #if defined(LIBC_SCCS) && !defined(lint) 33 __RCSID("$NetBSD: compat_dup3.c,v 1.2 2024/05/20 01:33:40 christos Exp $"); 34 #endif /* LIBC_SCCS and not lint */ 35 36 #include "namespace.h" 37 #define __LIBC12_SOURCE__ 38 #include <fcntl.h> 39 #include <compat/include/unistd.h> 40 41 __warn_references(dup3, 42 "warning: reference to compatibility dup3(); include <unistd.h> to generate correct reference") 43 44 int 45 dup3(int oldfd, int newfd, int flags) 46 { 47 if (oldfd != newfd) { 48 return __dup3100(oldfd, newfd, flags); 49 } 50 if (flags & (O_NONBLOCK|O_NOSIGPIPE)) { 51 int e = fcntl(newfd, F_GETFL, 0); 52 if (e == -1) 53 return -1; 54 e |= flags & (O_NONBLOCK|O_NOSIGPIPE); 55 e = fcntl(newfd, F_SETFL, e); 56 if (e == -1) 57 return -1; 58 } 59 if (flags & O_CLOEXEC) 60 return fcntl(newfd, F_SETFD, FD_CLOEXEC); 61 return 0; 62 } 63