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
39 #include "pthread_private.h"
42 fcntl(int fd, int cmd,...)
50 /* Lock the file descriptor: */
51 if ((ret = _FD_LOCK(fd, FD_RDWR, NULL)) == 0) {
52 /* Initialise the variable argument list: */
55 /* Process according to file control command type: */
57 /* Duplicate a file descriptor: */
60 * Get the file descriptor that the caller wants to
63 oldfd = va_arg(ap, int);
65 /* Initialise the file descriptor table entry: */
66 if ((ret = _thread_sys_fcntl(fd, cmd, oldfd)) < 0) {
68 /* Initialise the file descriptor table entry: */
69 else if (_thread_fd_table_init(ret) != 0) {
70 /* Quietly close the file: */
71 _thread_sys_close(ret);
73 /* Reset the file descriptor: */
77 * Save the file open flags so that they can
80 _thread_fd_table[ret]->flags = _thread_fd_table[fd]->flags;
84 flags = va_arg(ap, int);
85 ret = _thread_sys_fcntl(fd, cmd, flags);
88 ret = _thread_sys_fcntl(fd, cmd, 0);
91 ret = _thread_fd_table[fd]->flags;
95 * Get the file descriptor flags passed by the
98 flags = va_arg(ap, int);
101 * Check if the user wants a non-blocking file
104 nonblock = flags & O_NONBLOCK;
106 /* Set the file descriptor flags: */
107 if ((ret = _thread_sys_fcntl(fd, cmd, flags | O_NONBLOCK)) != 0) {
109 /* Get the flags so that we behave like the kernel: */
110 } else if ((flags = _thread_sys_fcntl(fd,
111 F_GETFL, 0)) == -1) {
112 /* Error getting flags: */
116 * Check if the file descriptor is non-blocking
117 * with respect to the user:
120 /* A non-blocking descriptor: */
121 _thread_fd_table[fd]->flags = flags | O_NONBLOCK;
123 /* Save the flags: */
124 _thread_fd_table[fd]->flags = flags & ~O_NONBLOCK;
127 /* Might want to make va_arg use a union */
128 ret = _thread_sys_fcntl(fd, cmd, va_arg(ap, void *));
132 /* Free variable arguments: */
135 /* Unlock the file descriptor: */
136 _FD_UNLOCK(fd, FD_RDWR);
139 /* Return the completion status: */