1/* $FreeBSD$ */
2/*	$NetBSD: citrus_mmap.c,v 1.4 2011/10/15 23:00:01 christos Exp $	*/
3
4/*-
5 * SPDX-License-Identifier: BSD-2-Clause
6 *
7 * Copyright (c)2003 Citrus Project,
8 * All rights reserved.
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 * 1. Redistributions of source code must retain the above copyright
14 *    notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 *    notice, this list of conditions and the following disclaimer in the
17 *    documentation and/or other materials provided with the distribution.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 * SUCH DAMAGE.
30 */
31
32#include "namespace.h"
33#include <sys/cdefs.h>
34#include <sys/mman.h>
35#include <sys/types.h>
36#include <sys/stat.h>
37
38#include <assert.h>
39#include <errno.h>
40#include <fcntl.h>
41#include <limits.h>
42#include <stdio.h>
43#include <stdlib.h>
44#include <string.h>
45#include <unistd.h>
46#include "un-namespace.h"
47
48#include "citrus_namespace.h"
49#include "citrus_region.h"
50#include "citrus_mmap.h"
51
52int
53_citrus_map_file(struct _citrus_region * __restrict r,
54    const char * __restrict path)
55{
56	struct stat st;
57	void *head;
58	int fd, ret;
59
60	ret = 0;
61
62	_region_init(r, NULL, 0);
63
64	if ((fd = _open(path, O_RDONLY | O_CLOEXEC)) == -1)
65		return (errno);
66
67	if (_fstat(fd, &st)  == -1) {
68		ret = errno;
69		goto error;
70	}
71	if (!S_ISREG(st.st_mode)) {
72		ret = EOPNOTSUPP;
73		goto error;
74	}
75
76	head = mmap(NULL, (size_t)st.st_size, PROT_READ, MAP_FILE|MAP_PRIVATE,
77	    fd, (off_t)0);
78	if (head == MAP_FAILED) {
79		ret = errno;
80		goto error;
81	}
82	_region_init(r, head, (size_t)st.st_size);
83
84error:
85	(void)_close(fd);
86	return (ret);
87}
88
89void
90_citrus_unmap_file(struct _citrus_region *r)
91{
92
93	if (_region_head(r) != NULL) {
94		(void)munmap(_region_head(r), _region_size(r));
95		_region_init(r, NULL, 0);
96	}
97}
98