1 /**************************************************************************
2  *
3  * Copyright 2011 LunarG, Inc.
4  * All Rights Reserved.
5  *
6  * Permission is hereby granted, free of charge, to any person obtaining a
7  * copy of this software and associated documentation files (the
8  * "Software"), to deal in the Software without restriction, including
9  * without limitation the rights to use, copy, modify, merge, publish,
10  * distribute, sub license, and/or sell copies of the Software, and to
11  * permit persons to whom the Software is furnished to do so, subject to
12  * the following conditions:
13  *
14  * The above copyright notice and this permission notice (including the
15  * next paragraph) shall be included in all copies or substantial portions
16  * of the Software.
17  *
18  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
19  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
20  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
21  * IN NO EVENT SHALL VMWARE AND/OR ITS SUPPLIERS BE LIABLE FOR
22  * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
23  * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
24  * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
25  *
26  **************************************************************************/
27 
28 /**
29  * @file
30  * OS independent memory mapping (with large file support).
31  *
32  * @author Chia-I Wu <olvaffe@gmail.com>
33  */
34 
35 #ifndef _OS_MMAN_H_
36 #define _OS_MMAN_H_
37 
38 #include <assert.h>
39 #include <stddef.h>
40 
41 #include "util/detect_os.h"
42 
43 #if DETECT_OS_UNIX
44 #  include <sys/mman.h>
45 #else
46 #  error Unsupported OS
47 #endif
48 
49 #ifdef __cplusplus
50 extern "C" {
51 #endif
52 
53 
54 #if DETECT_OS_ANDROID && !defined(__LP64__)
55 /* 32-bit needs mmap64 for 64-bit offsets */
56 #  define os_mmap(addr, length, prot, flags, fd, offset) \
57              mmap64(addr, length, prot, flags, fd, offset)
58 
59 #  define os_munmap(addr, length) \
60              munmap(addr, length)
61 
62 #else
63 /* assume large file support exists */
64 #  define os_mmap(addr, length, prot, flags, fd, offset) \
65              mmap(addr, length, prot, flags, fd, offset)
66 
67 static inline int os_munmap(void *addr, size_t length)
68 {
69    /* Copied from configure code generated by AC_SYS_LARGEFILE */
70 #define LARGE_OFF_T ((((off_t) 1 << 31) << 31) - 1 + \
71                      (((off_t) 1 << 31) << 31))
72    static_assert(LARGE_OFF_T % 2147483629 == 721 &&
73                  LARGE_OFF_T % 2147483647 == 1, "");
74 #undef LARGE_OFF_T
75 
76    return munmap(addr, length);
77 }
78 #endif
79 
80 
81 #ifdef __cplusplus
82 }
83 #endif
84 
85 #endif /* _OS_MMAN_H_ */
86