usr/src/lib/libc/port/gen/dup.c

   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  */
  28
  29 /*      Copyright (c) 1988 AT&T */
  30 /*        All Rights Reserved   */
  31
  32 #include        "lint.h"
  33 #include        <sys/types.h>
  34 #include        <fcntl.h>
  35 #include        <errno.h>
  36
  37 #pragma weak _dup = dup
  38 int
  39 dup(int fildes)
  40 {
  41         return (fcntl(fildes, F_DUPFD, 0));
  42 }
  43
  44 #pragma weak _dup2 = dup2
  45 int
  46 dup2(int fildes, int fildes2)
  47 {
  48         return (fcntl(fildes, F_DUP2FD, fildes2));
  49 }
  50
  51 int
  52 dup3(int fildes, int fildes2, int flags)
  53 {
  54         /*
  55          * The only valid flag is O_CLOEXEC.
  56          */
  57         if (flags & ~O_CLOEXEC) {
  58                 errno = EINVAL;
  59                 return (-1);
  60         }
  61
  62         /*
  63          * This call differs from dup2 such that it is an error when
  64          * fildes == fildes2
  65          */
  66         if (fildes == fildes2) {
  67                 errno = EINVAL;
  68                 return (-1);
  69         }
  70
  71         return (fcntl(fildes, (flags == 0) ? F_DUP2FD : F_DUP2FD_CLOEXEC,
  72             fildes2));
  73 }