11.4Skre/* $NetBSD: compat_dup3.c,v 1.4 2025/08/06 23:51:16 kre Exp $ */ 21.1Schristos 31.1Schristos/*- 41.1Schristos * Copyright (c) 2024 The NetBSD Foundation, Inc. 51.1Schristos * All rights reserved. 61.1Schristos * 71.1Schristos * This code is derived from software contributed to The NetBSD Foundation 81.1Schristos * by Christos Zoulas. 91.1Schristos * 101.1Schristos * Redistribution and use in source and binary forms, with or without 111.1Schristos * modification, are permitted provided that the following conditions 121.1Schristos * are met: 131.1Schristos * 1. Redistributions of source code must retain the above copyright 141.1Schristos * notice, this list of conditions and the following disclaimer. 151.1Schristos * 2. Redistributions in binary form must reproduce the above copyright 161.1Schristos * notice, this list of conditions and the following disclaimer in the 171.1Schristos * documentation and/or other materials provided with the distribution. 181.1Schristos * 191.1Schristos * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 201.1Schristos * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 211.1Schristos * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 221.1Schristos * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 231.1Schristos * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 241.1Schristos * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 251.1Schristos * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 261.1Schristos * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 271.1Schristos * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 281.1Schristos * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 291.1Schristos * POSSIBILITY OF SUCH DAMAGE. 301.1Schristos */ 311.1Schristos#include <sys/cdefs.h> 321.1Schristos#if defined(LIBC_SCCS) && !defined(lint) 331.4Skre__RCSID("$NetBSD: compat_dup3.c,v 1.4 2025/08/06 23:51:16 kre Exp $"); 341.1Schristos#endif /* LIBC_SCCS and not lint */ 351.1Schristos 361.1Schristos#include "namespace.h" 371.1Schristos#define __LIBC12_SOURCE__ 381.1Schristos#include <fcntl.h> 391.1Schristos#include <compat/include/unistd.h> 401.1Schristos 411.1Schristos__warn_references(dup3, 421.1Schristos "warning: reference to compatibility dup3(); include <unistd.h> to generate correct reference") 431.1Schristos 441.1Schristosint 451.1Schristosdup3(int oldfd, int newfd, int flags) 461.1Schristos{ 471.3Skre int fdflags; 481.3Skre 491.1Schristos if (oldfd != newfd) { 501.2Schristos return __dup3100(oldfd, newfd, flags); 511.1Schristos } 521.1Schristos if (flags & (O_NONBLOCK|O_NOSIGPIPE)) { 531.1Schristos int e = fcntl(newfd, F_GETFL, 0); 541.1Schristos if (e == -1) 551.1Schristos return -1; 561.1Schristos e |= flags & (O_NONBLOCK|O_NOSIGPIPE); 571.1Schristos e = fcntl(newfd, F_SETFL, e); 581.1Schristos if (e == -1) 591.1Schristos return -1; 601.1Schristos } 611.3Skre 621.3Skre switch (flags & (O_CLOEXEC|O_CLOFORK)) { 631.3Skre case O_CLOEXEC|O_CLOFORK: 641.3Skre fdflags = FD_CLOEXEC|FD_CLOFORK; 651.3Skre break; 661.3Skre case O_CLOEXEC: 671.3Skre fdflags = FD_CLOEXEC; 681.3Skre break; 691.3Skre case O_CLOFORK: 701.3Skre fdflags = FD_CLOFORK; 711.3Skre break; 721.3Skre default: 731.3Skre return 0; 741.3Skre } 751.3Skre return fcntl(newfd, F_SETFD, fdflags); 761.1Schristos} 77