fdopen.c revision 7c478bd95313f5f23a4c958a745db2134aa03244
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, Version 1.0 only
6 * (the "License").  You may not use this file except in compliance
7 * with the License.
8 *
9 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
10 * or http://www.opensolaris.org/os/licensing.
11 * See the License for the specific language governing permissions
12 * and limitations under the License.
13 *
14 * When distributing Covered Code, include this CDDL HEADER in each
15 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
16 * If applicable, add the following below this CDDL HEADER, with the
17 * fields enclosed by brackets "[]" replaced with your own identifying
18 * information: Portions Copyright [yyyy] [name of copyright owner]
19 *
20 * CDDL HEADER END
21 */
22/*
23 * Copyright 2004 Sun Microsystems, Inc.  All rights reserved.
24 * Use is subject to license terms.
25 */
26
27#pragma ident	"%Z%%M%	%I%	%E% SMI"
28
29/*	Copyright (c) 1988 AT&T	*/
30/*	  All Rights Reserved  	*/
31
32
33/*
34 * Unix routine to do an "fopen" on file descriptor
35 * The mode has to be repeated because you can't query its
36 * status
37 */
38
39#define	_LARGEFILE64_SOURCE 1
40
41#pragma weak fdopen = _fdopen
42
43#include <sys/feature_tests.h>
44
45#define	fdopen		_fdopen
46#if !defined(_LP64)
47#define	lseek64		_lseek64
48#endif
49
50#include "lint.h"
51#include <mtlib.h>
52#include "file64.h"
53#include <sys/types.h>
54#include <unistd.h>
55#include <stdio.h>
56#include <limits.h>
57#include <thread.h>
58#include <synch.h>
59#include "stdiom.h"
60#include <errno.h>
61#include <fcntl.h>
62
63FILE *
64fdopen(int fd, const char *type) /* associate file desc. with stream */
65{
66	/* iop doesn't need locking since this function is creating it */
67	FILE *iop;
68	char plus;
69	unsigned char flag;
70
71
72	/* Sets EBADF for bad fds */
73	if (fcntl(fd, F_GETFD) == -1)
74		return (NULL);
75
76#ifdef	_LP64
77	if ((iop = _findiop()) == 0) {
78		errno = ENOMEM;
79		return (NULL);
80	}
81	iop->_file = fd;
82#else
83	if (fd > UCHAR_MAX) {
84		errno = EMFILE;
85		return (NULL);
86	}
87	if ((iop = _findiop()) == 0) {
88		errno = ENOMEM;
89		return (NULL);
90	}
91	iop->_file = (unsigned char)fd;
92#endif	/*	_LP64	*/
93
94	switch (type[0]) {
95	default:
96		iop->_flag = 0; /* release iop */
97		errno = EINVAL;
98		return (NULL);
99	case 'r':
100		flag = _IOREAD;
101		break;
102	case 'a':
103		(void) lseek64(fd, (off64_t)0, SEEK_END);
104		/*FALLTHROUGH*/
105	case 'w':
106		flag = _IOWRT;
107		break;
108	}
109	if ((plus = type[1]) == 'b')	/* Unix ignores 'b' ANSI std */
110		plus = type[2];
111	if (plus == '+')
112		flag = _IORW;
113	iop->_flag = flag;
114
115	return (iop);
116}
117