1 /* 2 * CDDL HEADER START 3 * 4 * The contents of this file are subject to the terms of the 5 * Common Development and Distribution License (the "License"). 6 * You may not use this file except in compliance with the License. 7 * 8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 9 * or http://www.opensolaris.org/os/licensing. 10 * See the License for the specific language governing permissions 11 * and limitations under the License. 12 * 13 * When distributing Covered Code, include this CDDL HEADER in each 14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 15 * If applicable, add the following below this CDDL HEADER, with the 16 * fields enclosed by brackets "[]" replaced with your own identifying 17 * information: Portions Copyright [yyyy] [name of copyright owner] 18 * 19 * CDDL HEADER END 20 */ 21 22 /* Copyright 2013, OmniTI Computer Consulting, Inc. All rights reserved. */ 23 24 /* 25 * Copyright 2010 Sun Microsystems, Inc. All rights reserved. 26 * Use is subject to license terms. 27 * Copyright 2024 Oxide Computer Company 28 */ 29 30 /* Copyright (c) 1988 AT&T */ 31 /* All Rights Reserved */ 32 33 #include "lint.h" 34 #include <sys/types.h> 35 #include <fcntl.h> 36 #include <errno.h> 37 38 #pragma weak _dup = dup 39 int 40 dup(int fildes) 41 { 42 return (fcntl(fildes, F_DUPFD, 0)); 43 } 44 45 #pragma weak _dup2 = dup2 46 int 47 dup2(int fildes, int fildes2) 48 { 49 return (fcntl(fildes, F_DUP2FD, fildes2)); 50 } 51 52 int 53 dup3(int fildes, int fildes2, int flags) 54 { 55 int dflags = 0; 56 57 /* 58 * dup3() only supports O_ open flags that translate into file 59 * descriptor flags in the F_GETFD sense. 60 */ 61 if (flags & ~(O_CLOEXEC | O_CLOFORK)) { 62 errno = EINVAL; 63 return (-1); 64 } 65 66 /* 67 * This call differs from dup2 such that it is an error when 68 * fildes == fildes2 69 */ 70 if (fildes == fildes2) { 71 errno = EINVAL; 72 return (-1); 73 } 74 75 if ((flags & O_CLOEXEC) != 0) 76 dflags |= FD_CLOEXEC; 77 if ((flags & O_CLOFORK) != 0) 78 dflags |= FD_CLOFORK; 79 80 return (fcntl(fildes, F_DUP3FD, fildes2, dflags)); 81 } 82