lib/libc_r/uthread/uthread_dup.c

   1 /*
   2  * Copyright (c) 1995-1998 John Birrell <jb@cimlogic.com.au>
   3  * All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  * 3. All advertising materials mentioning features or use of this software
  14  *    must display the following acknowledgement:
  15  *      This product includes software developed by John Birrell.
  16  * 4. Neither the name of the author nor the names of any co-contributors
  17  *    may be used to endorse or promote products derived from this software
  18  *    without specific prior written permission.
  19  *
  20  * THIS SOFTWARE IS PROVIDED BY JOHN BIRRELL AND CONTRIBUTORS ``AS IS'' AND
  21  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  22  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  23  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  24  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  25  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  26  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  27  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  28  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  29  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  30  * SUCH DAMAGE.
  31  *
  32  * $FreeBSD: src/lib/libc_r/uthread/uthread_dup.c,v 1.8.2.3 2002/10/22 14:44:03 fjoe Exp $
  33  * $DragonFly: src/lib/libc_r/uthread/uthread_dup.c,v 1.2 2003/06/17 04:26:48 dillon Exp $
  34  */
  35 #include <unistd.h>
  36 #include <pthread.h>
  37 #include "pthread_private.h"
  38
  39 int
  40 _dup(int fd)
  41 {
  42         int             ret;
  43
  44         /* Lock the file descriptor: */
  45         if ((ret = _FD_LOCK(fd, FD_RDWR, NULL)) == 0) {
  46                 /* Perform the 'dup' syscall: */
  47                 if ((ret = __sys_dup(fd)) < 0) {
  48                 }
  49                 /* Initialise the file descriptor table entry: */
  50                 else if (_thread_fd_table_init(ret) != 0) {
  51                         /* Quietly close the file: */
  52                         __sys_close(ret);
  53
  54                         /* Reset the file descriptor: */
  55                         ret = -1;
  56                 } else {
  57                         /*
  58                          * Save the file open flags so that they can be
  59                          * checked later:
  60                          */
  61                         _thread_fd_setflags(ret, _thread_fd_getflags(fd));
  62                 }
  63
  64                 /* Unlock the file descriptor: */
  65                 _FD_UNLOCK(fd, FD_RDWR);
  66         }
  67         /* Return the completion status: */
  68         return (ret);
  69 }
  70
  71 __strong_reference(_dup, dup);