thr_fcntl.c revision 13546
1/*
2 * Copyright (c) 1995 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 REGENTS 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 */
33#include <stdarg.h>
34#include <fcntl.h>
35#ifdef _THREAD_SAFE
36#include <pthread.h>
37#include "pthread_private.h"
38
39int
40fcntl(int fd, int cmd,...)
41{
42	int             flags = 0;
43	int             oldfd;
44	int             ret;
45	int             status;
46	va_list         ap;
47
48	/* Block signals: */
49	_thread_kern_sig_block(&status);
50
51	/* Lock the file descriptor: */
52	if ((ret = _thread_fd_lock(fd, FD_RDWR, NULL, __FILE__, __LINE__)) == 0) {
53		/* Initialise the variable argument list: */
54		va_start(ap, cmd);
55
56		/* Process according to file control command type: */
57		switch (cmd) {
58			/* Duplicate a file descriptor: */
59		case F_DUPFD:
60			/*
61			 * Get the file descriptor that the caller wants to
62			 * use:
63			 */
64			oldfd = va_arg(ap, int);
65
66			/* Initialise the file descriptor table entry: */
67			if ((ret = _thread_sys_fcntl(fd, cmd, oldfd)) < 0) {
68			}
69			/* Initialise the file descriptor table entry: */
70			else if (_thread_fd_table_init(ret) != 0) {
71				/* Quietly close the file: */
72				_thread_sys_close(ret);
73
74				/* Reset the file descriptor: */
75				ret = -1;
76			} else {
77				/*
78				 * Save the file open flags so that they can
79				 * be         checked later:
80				 */
81				_thread_fd_table[ret]->flags = _thread_fd_table[fd]->flags;
82			}
83			break;
84		case F_SETFD:
85			break;
86		case F_GETFD:
87			break;
88		case F_GETFL:
89			ret = _thread_fd_table[fd]->flags;
90			break;
91		case F_SETFL:
92			flags = va_arg(ap, int);
93			if ((ret = _thread_sys_fcntl(fd, cmd, flags | O_NONBLOCK)) == 0) {
94				_thread_fd_table[fd]->flags = flags;
95			}
96			break;
97		default:
98			/* Might want to make va_arg use a union */
99			ret = _thread_sys_fcntl(fd, cmd, va_arg(ap, void *));
100			break;
101		}
102
103		/* Free variable arguments: */
104		va_end(ap);
105
106		/* Unlock the file descriptor: */
107		_thread_fd_unlock(fd, FD_RDWR);
108	}
109	/* Unblock signals: */
110	_thread_kern_sig_unblock(status);
111
112	/* Return the completion status: */
113	return (ret);
114}
115#endif
116