1 /* $NetBSD: citrus_mmap.c,v 1.4 2011/10/15 23:00:01 christos Exp $ */
2
3 /*-
4 * SPDX-License-Identifier: BSD-2-Clause
5 *
6 * Copyright (c)2003 Citrus Project,
7 * All rights reserved.
8 *
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
11 * are met:
12 * 1. Redistributions of source code must retain the above copyright
13 * notice, this list of conditions and the following disclaimer.
14 * 2. Redistributions in binary form must reproduce the above copyright
15 * notice, this list of conditions and the following disclaimer in the
16 * documentation and/or other materials provided with the distribution.
17 *
18 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
19 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
21 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
22 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
24 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
25 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
26 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
27 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
28 * SUCH DAMAGE.
29 */
30
31 #include "namespace.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
50 int
_citrus_map_file(struct _citrus_region * __restrict r,const char * __restrict path)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
82 error:
83 (void)_close(fd);
84 return (ret);
85 }
86
87 void
_citrus_unmap_file(struct _citrus_region * r)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