port/stdio/fdopen.c

	fdopen.c revision a5f69788de7ac07553de47f7fec8c05a9a94c105
/*
 * CDDL HEADER START
 *
 * The contents of this file are subject to the terms of the
 * Common Development and Distribution License (the "License").
 * You may not use this file except in compliance with the License.
 *
 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
 * or http://www.opensolaris.org/os/licensing.
 * See the License for the specific language governing permissions
 * and limitations under the License.
 *
 * When distributing Covered Code, include this CDDL HEADER in each
 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
 * If applicable, add the following below this CDDL HEADER, with the
 * fields enclosed by brackets "[]" replaced with your own identifying
 * information: Portions Copyright [yyyy] [name of copyright owner]
 *
 * CDDL HEADER END
 */

/*
 * Copyright 2006 Sun Microsystems, Inc.  All rights reserved.
 * Use is subject to license terms.
 */

/*  Copyright (c) 1988 AT&T */
/*    All Rights Reserved   */

#pragma ident   "%Z%%M% %I% %E% SMI"

/*
 * Unix routine to do an "fopen" on file descriptor
 * The mode has to be repeated because you can't query its
 * status
 */

#define _LARGEFILE64_SOURCE 1

#pragma weak fdopen = _fdopen

#include "synonyms.h"
#include <mtlib.h>
#include "file64.h"
#include <sys/types.h>
#include <unistd.h>
#include <stdio.h>
#include <limits.h>
#include <thread.h>
#include <synch.h>
#include "stdiom.h"
#include <errno.h>
#include <fcntl.h>

FILE *
fdopen(int fd, const char *type) /* associate file desc. with stream */
{
    /* iop doesn't need locking since this function is creating it */
    FILE *iop;
    char plus;
    unsigned char flag;

    /* Sets EBADF for bad fds */
    if (fcntl(fd, F_GETFD) == -1)
        return (NULL);

    if ((iop = _findiop()) == 0) {
        errno = ENOMEM;
        return (NULL);
    }

    switch (type[0]) {
    default:
        iop->_flag = 0; /* release iop */
        errno = EINVAL;
        return (NULL);
    case 'r':
        flag = _IOREAD;
        break;
    case 'a':
        (void) lseek64(fd, (off64_t)0, SEEK_END);
        /*FALLTHROUGH*/
    case 'w':
        flag = _IOWRT;
        break;
    }
    if ((plus = type[1]) == 'b')    /* Unix ignores 'b' ANSI std */
        plus = type[2];
    if (plus == '+')
        flag = _IORW;
    iop->_flag = flag;

#ifdef  _LP64
    iop->_file = fd;
#else
    if (fd <= _FILE_FD_MAX) {
        SET_FILE(iop, fd);
    } else if (_file_set(iop, fd, type) != 0) {
        /* errno set by _file_set () */
        iop->_flag = 0;     /* release iop */
        return (NULL);
    }
#endif  /*  _LP64   */

    return (iop);
}