1/* $FreeBSD$ */
2/* $NetBSD: citrus_mmap.c,v 1.3 2005/01/19 00:52:37 mycroft 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 <sys/cdefs.h>
31#include <sys/mman.h>
32#include <sys/types.h>
33#include <sys/stat.h>
34
35#include <assert.h>
36#include <errno.h>
37#include <fcntl.h>
38#include <limits.h>
39#include <stdio.h>
40#include <stdlib.h>
41#include <string.h>
42#include <unistd.h>
43
44#include "citrus_namespace.h"
45#include "citrus_region.h"
46#include "citrus_mmap.h"
47
48int
49_citrus_map_file(struct _citrus_region * __restrict r,
50    const char * __restrict path)
51{
52	struct stat st;
53	void *head;
54	int fd, ret;
55
56	ret = 0;
57
58	_region_init(r, NULL, 0);
59
60	if ((fd = open(path, O_RDONLY | O_CLOEXEC)) == -1)
61		return (errno);
62
63	if (fstat(fd, &st)  == -1) {
64		ret = errno;
65		goto error;
66	}
67	if (!S_ISREG(st.st_mode)) {
68		ret = EOPNOTSUPP;
69		goto error;
70	}
71
72	head = mmap(NULL, (size_t)st.st_size, PROT_READ, MAP_FILE|MAP_PRIVATE,
73	    fd, (off_t)0);
74	if (head == MAP_FAILED) {
75		ret = errno;
76		goto error;
77	}
78	_region_init(r, head, (size_t)st.st_size);
79
80error:
81	(void)close(fd);
82	return (ret);
83}
84
85void
86_citrus_unmap_file(struct _citrus_region *r)
87{
88
89	if (_region_head(r) != NULL) {
90		(void)munmap(_region_head(r), _region_size(r));
91		_region_init(r, NULL, 0);
92	}
93}
94