xref: /illumos-gate/usr/src/lib/libc/port/stdio/_endopen.c (revision 8a67df42)

/*
 * 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 2008 Sun Microsystems, Inc.  All rights reserved.
 * Use is subject to license terms.
 */

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

/* Copyright (c) 2013 OmniTI Computer Consulting, Inc. All rights reserved. */

/*
 *	This routine is a special case, in that it is aware of
 *	both small and large file interfaces. It must be built
 *	in the small compilation environment.
 */

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

/*
 * open UNIX file name, associate with iop
 */

FILE *
_endopen(const char *name, const char *type, FILE *iop, int largefile)
{
	int oflag, fd, fflag;

	if (iop == NULL)
		return (NULL);

	if (_stdio_flags(type, &oflag, &fflag) != 0) {
		return (NULL);
	}

	/* select small or large file open based on flag */
	if (largefile) {
		fd = open64(name, oflag, 0666);
	} else {
		fd = open(name, oflag, 0666);
	}
	if (fd < 0)
		return (NULL);

	/* As long as we make sure _flag stays != 0, we don't need to lock */
#ifdef	_LP64
	iop->_file = fd;
	iop->_flag = (iop->_flag & ~_DEF_FLAG_MASK) | fflag;
#else
	if (fd <= _FILE_FD_MAX) {
		SET_FILE(iop, fd);
	} else if (_file_set(iop, fd, type) != 0) {
		/* errno set in _file_set() */
		int err = errno;
		(void) close(fd);
		errno = err;
		return (NULL);
	}
	iop->_flag = fflag;
#endif	/*	_LP64	*/

	if (oflag == (O_WRONLY | O_APPEND | O_CREAT)) {	/* type == "a" */
		if (_xseek64(iop, (off64_t)0, SEEK_END) < (off64_t)0) {
			(void) _xclose(iop);
			return (NULL);
		}
	}

	return (iop);
}