fdopen.c revision a5f69788de7ac07553de47f7fec8c05a9a94c105
1/*
2 * CDDL HEADER START
3 *
4 * The contents of this file are subject to the terms of the
5 * Common Development and Distribution License (the "License").
6 * You may not use this file except in compliance with the License.
7 *
8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
9 * or http://www.opensolaris.org/os/licensing.
10 * See the License for the specific language governing permissions
11 * and limitations under the License.
12 *
13 * When distributing Covered Code, include this CDDL HEADER in each
14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
15 * If applicable, add the following below this CDDL HEADER, with the
16 * fields enclosed by brackets "[]" replaced with your own identifying
17 * information: Portions Copyright [yyyy] [name of copyright owner]
18 *
19 * CDDL HEADER END
20 */
21
22/*
23 * Copyright 2006 Sun Microsystems, Inc.  All rights reserved.
24 * Use is subject to license terms.
25 */
26
27/*	Copyright (c) 1988 AT&T	*/
28/*	  All Rights Reserved  	*/
29
30#pragma ident	"%Z%%M%	%I%	%E% SMI"
31
32/*
33 * Unix routine to do an "fopen" on file descriptor
34 * The mode has to be repeated because you can't query its
35 * status
36 */
37
38#define	_LARGEFILE64_SOURCE 1
39
40#pragma weak fdopen = _fdopen
41
42#include "synonyms.h"
43#include <mtlib.h>
44#include "file64.h"
45#include <sys/types.h>
46#include <unistd.h>
47#include <stdio.h>
48#include <limits.h>
49#include <thread.h>
50#include <synch.h>
51#include "stdiom.h"
52#include <errno.h>
53#include <fcntl.h>
54
55FILE *
56fdopen(int fd, const char *type) /* associate file desc. with stream */
57{
58	/* iop doesn't need locking since this function is creating it */
59	FILE *iop;
60	char plus;
61	unsigned char flag;
62
63	/* Sets EBADF for bad fds */
64	if (fcntl(fd, F_GETFD) == -1)
65		return (NULL);
66
67	if ((iop = _findiop()) == 0) {
68		errno = ENOMEM;
69		return (NULL);
70	}
71
72	switch (type[0]) {
73	default:
74		iop->_flag = 0; /* release iop */
75		errno = EINVAL;
76		return (NULL);
77	case 'r':
78		flag = _IOREAD;
79		break;
80	case 'a':
81		(void) lseek64(fd, (off64_t)0, SEEK_END);
82		/*FALLTHROUGH*/
83	case 'w':
84		flag = _IOWRT;
85		break;
86	}
87	if ((plus = type[1]) == 'b')	/* Unix ignores 'b' ANSI std */
88		plus = type[2];
89	if (plus == '+')
90		flag = _IORW;
91	iop->_flag = flag;
92
93#ifdef	_LP64
94	iop->_file = fd;
95#else
96	if (fd <= _FILE_FD_MAX) {
97		SET_FILE(iop, fd);
98	} else if (_file_set(iop, fd, type) != 0) {
99		/* errno set by _file_set () */
100		iop->_flag = 0;		/* release iop */
101		return (NULL);
102	}
103#endif	/*	_LP64	*/
104
105	return (iop);
106}
107