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