usr/src/lib/libbc/libc/sys/common/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 /*
  23  * Copyright 2010 Sun Microsystems, Inc.  All rights reserved.
  24  * Use is subject to license terms.
  25  */
  26
  27 #include <sys/syscall.h>
  28 #include <sys/fcntl.h>
  29
  30 int
  31 dup(int fd)
  32 {
  33         int ret, fds;
  34
  35         if ((ret = _syscall(SYS_fcntl, fd, F_DUPFD, 0)) == -1)
  36                 return (-1);
  37
  38         if ((fds = fd_get(fd)) != -1)
  39                 fd_add(ret, fds);
  40
  41         return (ret);
  42 }