2 * Copyright (c) 1995-1998 John Birrell <jb@cimlogic.com.au>
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
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.
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
37 #include "pthread_private.h"
39 __weak_reference(_dup2, dup2);
42 _dup2(int fd, int newfd)
47 /* Check if the file descriptor is out of range: */
48 if (newfd < 0 || newfd >= _thread_dtablesize ||
49 newfd == _thread_kern_pipe[0] || newfd == _thread_kern_pipe[1]) {
50 /* Return a bad file descriptor error: */
55 /* Lock the file descriptor: */
56 else if ((ret = _FD_LOCK(fd, FD_RDWR, NULL)) == 0) {
57 /* Lock the file descriptor: */
58 if (!(newfd_opened = (_thread_fd_table[newfd] != NULL)) ||
59 (ret = _FD_LOCK(newfd, FD_RDWR, NULL)) == 0) {
60 /* Perform the 'dup2' syscall: */
61 ret = __sys_dup2(fd, newfd);
64 * If we are duplicating one of the standard
65 * file descriptors, update its flags in the
66 * table of pthread stdio descriptor flags.
69 _pthread_stdio_flags[ret] =
70 _thread_fd_table[fd]->flags;
72 /* Initialise the file descriptor table entry */
73 if (_thread_fd_table_init(ret) != 0) {
74 /* Quietly close the file: */
77 /* Reset the file descriptor: */
81 * Save the file open flags so that
82 * they can be checked later:
84 _thread_fd_setflags(ret,
85 _thread_fd_getflags(fd));
89 /* Unlock the file descriptor: */
91 _FD_UNLOCK(newfd, FD_RDWR);
93 /* Unlock the file descriptor: */
94 _FD_UNLOCK(fd, FD_RDWR);
96 /* Return the completion status: */