7 #ifndef FILE_MAP_EXECUTE
8 #define FILE_MAP_EXECUTE 0x0020
9 #endif /* FILE_MAP_EXECUTE */
11 static int __map_mman_error(const DWORD err, const int deferr)
19 static DWORD __map_mmap_prot_page(const int prot)
23 if (prot == PROT_NONE)
26 if ((prot & PROT_EXEC) != 0)
27 protect = ((prot & PROT_WRITE) != 0) ?
28 PAGE_EXECUTE_READWRITE : PAGE_EXECUTE_READ;
30 protect = ((prot & PROT_WRITE) != 0) ?
31 PAGE_READWRITE : PAGE_READONLY;
36 static DWORD __map_mmap_prot_file(const int prot)
38 DWORD desiredAccess = 0;
40 if (prot == PROT_NONE)
43 if ((prot & PROT_READ) != 0)
44 desiredAccess |= FILE_MAP_READ;
45 if ((prot & PROT_WRITE) != 0)
46 desiredAccess |= FILE_MAP_WRITE;
47 if ((prot & PROT_EXEC) != 0)
48 desiredAccess |= FILE_MAP_EXECUTE;
53 void* mmap(void *addr, size_t len, int prot, int flags, int fildes, off_t off)
57 void * map = MAP_FAILED;
61 #pragma warning(disable: 4293)
64 const DWORD dwFileOffsetLow = (sizeof(off_t) <= sizeof(DWORD)) ?
65 (DWORD)off : (DWORD)(off & 0xFFFFFFFFL);
66 const DWORD dwFileOffsetHigh = (sizeof(off_t) <= sizeof(DWORD)) ?
67 (DWORD)0 : (DWORD)((off >> 32) & 0xFFFFFFFFL);
68 const DWORD protect = __map_mmap_prot_page(prot);
69 const DWORD desiredAccess = __map_mmap_prot_file(prot);
71 const off_t maxSize = off + (off_t)len;
73 const DWORD dwMaxSizeLow = (sizeof(off_t) <= sizeof(DWORD)) ?
74 (DWORD)maxSize : (DWORD)(maxSize & 0xFFFFFFFFL);
75 const DWORD dwMaxSizeHigh = (sizeof(off_t) <= sizeof(DWORD)) ?
76 (DWORD)0 : (DWORD)((maxSize >> 32) & 0xFFFFFFFFL);
85 /* Unsupported flag combinations */
86 || (flags & MAP_FIXED) != 0
87 /* Usupported protection combinations */
94 h = ((flags & MAP_ANONYMOUS) == 0) ?
95 (HANDLE)_get_osfhandle(fildes) : INVALID_HANDLE_VALUE;
97 if ((flags & MAP_ANONYMOUS) == 0 && h == INVALID_HANDLE_VALUE)
103 fm = CreateFileMapping(h, NULL, protect, dwMaxSizeHigh, dwMaxSizeLow, NULL);
108 map = MapViewOfFile(fm, desiredAccess, dwFileOffsetHigh, dwFileOffsetLow, len);
117 errno = __map_mman_error(GetLastError(), EPERM);
121 int munmap(void *addr, size_t len)
123 if (UnmapViewOfFile(addr))
126 errno = __map_mman_error(GetLastError(), EPERM);
131 int mprotect(void *addr, size_t len, int prot)
133 DWORD newProtect = __map_mmap_prot_page(prot);
134 DWORD oldProtect = 0;
136 if (VirtualProtect(addr, len, newProtect, &oldProtect))
139 errno = __map_mman_error(GetLastError(), EPERM);
144 int msync(void *addr, size_t len, int flags)
146 if (FlushViewOfFile(addr, len))
149 errno = __map_mman_error(GetLastError(), EPERM);
154 int mlock(const void *addr, size_t len)
156 if (VirtualLock((LPVOID)addr, len))
159 errno = __map_mman_error(GetLastError(), EPERM);
164 int munlock(const void *addr, size_t len)
166 if (VirtualUnlock((LPVOID)addr, len))
169 errno = __map_mman_error(GetLastError(), EPERM);