1 /* $NetBSD: citrus_mmap.c,v 1.5 2017/01/10 16:51:30 christos Exp $ */
2
3 /*-
4 * Copyright (c)2003 Citrus Project,
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26 * SUCH DAMAGE.
27 */
28
29 #include <sys/cdefs.h>
30 #if defined(LIBC_SCCS) && !defined(lint)
31 __RCSID("$NetBSD: citrus_mmap.c,v 1.5 2017/01/10 16:51:30 christos Exp $");
32 #endif /* LIBC_SCCS and not lint */
33
34 #include "namespace.h"
35
36 #include <sys/mman.h>
37 #include <sys/stat.h>
38
39 #include <assert.h>
40 #include <errno.h>
41 #include <stdio.h>
42 #include <stdlib.h>
43 #include <string.h>
44 #include <unistd.h>
45 #include <fcntl.h>
46 #include <limits.h>
47
48 #include "citrus_namespace.h"
49 #include "citrus_region.h"
50 #include "citrus_mmap.h"
51
52 int
_citrus_map_file(struct _citrus_region * __restrict r,const char * __restrict path)53 _citrus_map_file(struct _citrus_region * __restrict r,
54 const char * __restrict path)
55 {
56 int fd, ret = 0;
57 struct stat st;
58 void *head;
59
60 _DIAGASSERT(r != NULL);
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
84 error:
85 (void)close(fd);
86 return ret;
87 }
88
89 void
_citrus_unmap_file(struct _citrus_region * r)90 _citrus_unmap_file(struct _citrus_region *r)
91 {
92
93 _DIAGASSERT(r != NULL);
94
95 if (_region_head(r) != NULL) {
96 (void)munmap(_region_head(r), _region_size(r));
97 _region_init(r, NULL, 0);
98 }
99 }
100