Subversion Repositories shark

Rev

Rev 2 | Details | Compare with Previous | Last modification | View Log | RSS feed

Rev Author Line No. Line
2 pj 1
/*-
2
 * Copyright (c) 1990, 1993
3
 *      The Regents of the University of California.  All rights reserved.
4
 *
5
 * This code is derived from software contributed to Berkeley by
6
 * Chris Torek.
7
 *
8
 * Redistribution and use in source and binary forms, with or without
9
 * modification, are permitted provided that the following conditions
10
 * are met:
11
 * 1. Redistributions of source code must retain the above copyright
12
 *    notice, this list of conditions and the following disclaimer.
13
 * 2. Redistributions in binary form must reproduce the above copyright
14
 *    notice, this list of conditions and the following disclaimer in the
15
 *    documentation and/or other materials provided with the distribution.
16
 * 3. All advertising materials mentioning features or use of this software
17
 *    must display the following acknowledgement:
18
 *      This product includes software developed by the University of
19
 *      California, Berkeley and its contributors.
20
 * 4. Neither the name of the University nor the names of its contributors
21
 *    may be used to endorse or promote products derived from this software
22
 *    without specific prior written permission.
23
 *
24
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
25
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
26
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
27
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
28
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
29
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
30
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
31
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
32
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
33
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
34
 * SUCH DAMAGE.
35
 */
36
 
37
#if defined(LIBC_SCCS) && !defined(lint)
38
static char sccsid[] = "@(#)fdopen.c    8.1 (Berkeley) 6/4/93";
39
#endif /* LIBC_SCCS and not lint */
40
 
41
#include <sys/types.h>
42
#include <fcntl.h>
43
#include <unistd.h>
44
#include <stdio.h>
45
#include <errno.h>
46
#include "local.h"
47
 
48
FILE *
49
fdopen(fd, mode)
50
        int fd;
51
        const char *mode;
52
{
53
        register FILE *fp;
54
        static int nofile;
55
        int flags, oflags, fdflags, tmp;
56
 
57
        if (nofile == 0)
58
                nofile = getdtablesize();
59
 
60
        if ((flags = __sflags(mode, &oflags)) == 0)
61
                return (NULL);
62
 
63
        /* Make sure the mode the user wants is a subset of the actual mode. */
64
        if ((fdflags = fcntl(fd, F_GETFL, 0)) < 0)
65
                return (NULL);
66
        tmp = fdflags & O_ACCMODE;
67
        if (tmp != O_RDWR && (tmp != (oflags & O_ACCMODE))) {
68
                errno = EINVAL;
69
                return (NULL);
70
        }
71
 
72
        if ((fp = __sfp()) == NULL)
73
                return (NULL);
74
        fp->_flags = flags;
75
        /*
76
         * If opened for appending, but underlying descriptor does not have
77
         * O_APPEND bit set, assert __SAPP so that __swrite() will lseek to
78
         * end before each write.
79
         */
80
        if ((oflags & O_APPEND) && !(fdflags & O_APPEND))
81
                fp->_flags |= __SAPP;
82
        fp->_file = fd;
83
        fp->_cookie = fp;
84
        fp->_read = __sread;
85
        fp->_write = __swrite;
86
        fp->_seek = __sseek;
87
        fp->_close = __sclose;
88
        return (fp);
89
}