fdopen.c revision e8031f0a8ed0e45c6d8847c5e09424e66fd34a4b
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/*
24 * Copyright 2006 Sun Microsystems, Inc.  All rights reserved.
25 * Use is subject to license terms.
26 */
27
28#pragma ident	"%Z%%M%	%I%	%E% SMI"
29
30/*	Copyright (c) 1988 AT&T	*/
31/*	  All Rights Reserved  	*/
32
33
34/*
35 * Unix routine to do an "fopen" on file descriptor
36 * The mode has to be repeated because you can't query its
37 * status
38 */
39
40#define	_LARGEFILE64_SOURCE 1
41
42#pragma weak fdopen = _fdopen
43
44#include "synonyms.h"
45#include <mtlib.h>
46#include "file64.h"
47#include <sys/types.h>
48#include <unistd.h>
49#include <stdio.h>
50#include <limits.h>
51#include <thread.h>
52#include <synch.h>
53#include "stdiom.h"
54#include <errno.h>
55#include <fcntl.h>
56
57FILE *
58fdopen(int fd, const char *type) /* associate file desc. with stream */
59{
60	/* iop doesn't need locking since this function is creating it */
61	FILE *iop;
62	char plus;
63	unsigned char flag;
64
65
66	/* Sets EBADF for bad fds */
67	if (fcntl(fd, F_GETFD) == -1)
68		return (NULL);
69
70#ifdef	_LP64
71	if ((iop = _findiop()) == 0) {
72		errno = ENOMEM;
73		return (NULL);
74	}
75	iop->_file = fd;
76#else
77	if (fd > UCHAR_MAX) {
78		errno = EMFILE;
79		return (NULL);
80	}
81	if ((iop = _findiop()) == 0) {
82		errno = ENOMEM;
83		return (NULL);
84	}
85	iop->_file = (unsigned char)fd;
86#endif	/*	_LP64	*/
87
88	switch (type[0]) {
89	default:
90		iop->_flag = 0; /* release iop */
91		errno = EINVAL;
92		return (NULL);
93	case 'r':
94		flag = _IOREAD;
95		break;
96	case 'a':
97		(void) lseek64(fd, (off64_t)0, SEEK_END);
98		/*FALLTHROUGH*/
99	case 'w':
100		flag = _IOWRT;
101		break;
102	}
103	if ((plus = type[1]) == 'b')	/* Unix ignores 'b' ANSI std */
104		plus = type[2];
105	if (plus == '+')
106		flag = _IORW;
107	iop->_flag = flag;
108
109	return (iop);
110}
111