mman.h windows
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//mman.h /* * sys/mman.h * mman-win32 */ #ifndef _SYS_MMAN_H_ #define _SYS_MMAN_H_ #ifndef _WIN32_WINNT // Allow use of features specific to Windows XP or later. #define _WIN32_WINNT 0x0501 // Change this to the appropriate value to target other versions of Windows. #endif /* All the headers include this file. */ #ifndef _MSC_VER #include <_mingw.h> #endif #include <sys/types.h> #ifdef __cplusplus extern "C" { #endif #define PROT_NONE 0 #define PROT_READ 1 #define PROT_WRITE 2 #define PROT_EXEC 4 #define MAP_FILE 0 #define MAP_SHARED 1 #define MAP_PRIVATE 2 #define MAP_TYPE 0xf #define MAP_FIXED 0x10 #define MAP_ANONYMOUS 0x20 #define MAP_ANON MAP_ANONYMOUS #define MAP_FAILED ((void *)-1) /* Flags for msync. */ #define MS_ASYNC 1 #define MS_SYNC 2 #define MS_INVALIDATE 4 void* mmap(void *addr, size_t len, int prot, int flags, int fildes, off_t off); int munmap(void *addr, size_t len); int mprotect(void *addr, size_t len, int prot); int msync(void *addr, size_t len, int flags); int mlock(const void *addr, size_t len); int munlock(const void *addr, size_t len); #ifdef __cplusplus }; #endif #endif /* _SYS_MMAN_H_ */ |
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//mman.c #include <windows.h> #include <errno.h> #include <io.h> #include "mman.h" #ifndef FILE_MAP_EXECUTE #define FILE_MAP_EXECUTE 0x0020 #endif /* FILE_MAP_EXECUTE */ static int __map_mman_error(const DWORD err, const int deferr) { if (err == 0) return 0; //TODO: implement return err; } static DWORD __map_mmap_prot_page(const int prot) { DWORD protect = 0; if (prot == PROT_NONE) return protect; if ((prot & PROT_EXEC) != 0) { protect = ((prot & PROT_WRITE) != 0) ? PAGE_EXECUTE_READWRITE : PAGE_EXECUTE_READ; } else { protect = ((prot & PROT_WRITE) != 0) ? PAGE_READWRITE : PAGE_READONLY; } return protect; } static DWORD __map_mmap_prot_file(const int prot) { DWORD desiredAccess = 0; if (prot == PROT_NONE) return desiredAccess; if ((prot & PROT_READ) != 0) desiredAccess |= FILE_MAP_READ; if ((prot & PROT_WRITE) != 0) desiredAccess |= FILE_MAP_WRITE; if ((prot & PROT_EXEC) != 0) desiredAccess |= FILE_MAP_EXECUTE; return desiredAccess; } void* mmap(void *addr, size_t len, int prot, int flags, int fildes, off_t off) { HANDLE fm, h; void * map = MAP_FAILED; #ifdef _MSC_VER #pragma warning(push) #pragma warning(disable: 4293) #endif const DWORD dwFileOffsetLow = (sizeof(off_t) <= sizeof(DWORD)) ? (DWORD)off : (DWORD)(off & 0xFFFFFFFFL); const DWORD dwFileOffsetHigh = (sizeof(off_t) <= sizeof(DWORD)) ? (DWORD)0 : (DWORD)((off >> 32) & 0xFFFFFFFFL); const DWORD protect = __map_mmap_prot_page(prot); const DWORD desiredAccess = __map_mmap_prot_file(prot); const off_t maxSize = off + (off_t)len; const DWORD dwMaxSizeLow = (sizeof(off_t) <= sizeof(DWORD)) ? (DWORD)maxSize : (DWORD)(maxSize & 0xFFFFFFFFL); const DWORD dwMaxSizeHigh = (sizeof(off_t) <= sizeof(DWORD)) ? (DWORD)0 : (DWORD)((maxSize >> 32) & 0xFFFFFFFFL); #ifdef _MSC_VER #pragma warning(pop) #endif errno = 0; if (len == 0 /* Unsupported flag combinations */ || (flags & MAP_FIXED) != 0 /* Usupported protection combinations */ || prot == PROT_EXEC) { errno = EINVAL; return MAP_FAILED; } h = ((flags & MAP_ANONYMOUS) == 0) ? (HANDLE)_get_osfhandle(fildes) : INVALID_HANDLE_VALUE; if ((flags & MAP_ANONYMOUS) == 0 && h == INVALID_HANDLE_VALUE) { errno = EBADF; return MAP_FAILED; } fm = CreateFileMapping(h, NULL, protect, dwMaxSizeHigh, dwMaxSizeLow, NULL); if (fm == NULL) { errno = __map_mman_error(GetLastError(), EPERM); return MAP_FAILED; } map = MapViewOfFile(fm, desiredAccess, dwFileOffsetHigh, dwFileOffsetLow, len); CloseHandle(fm); if (map == NULL) { errno = __map_mman_error(GetLastError(), EPERM); return MAP_FAILED; } return map; } int munmap(void *addr, size_t len) { if (UnmapViewOfFile(addr)) return 0; errno = __map_mman_error(GetLastError(), EPERM); return -1; } int mprotect(void *addr, size_t len, int prot) { DWORD newProtect = __map_mmap_prot_page(prot); DWORD oldProtect = 0; if (VirtualProtect(addr, len, newProtect, &oldProtect)) return 0; errno = __map_mman_error(GetLastError(), EPERM); return -1; } int msync(void *addr, size_t len, int flags) { if (FlushViewOfFile(addr, len)) return 0; errno = __map_mman_error(GetLastError(), EPERM); return -1; } int mlock(const void *addr, size_t len) { if (VirtualLock((LPVOID)addr, len)) return 0; errno = __map_mman_error(GetLastError(), EPERM); return -1; } int munlock(const void *addr, size_t len) { if (VirtualUnlock((LPVOID)addr, len)) return 0; errno = __map_mman_error(GetLastError(), EPERM); return -1; } |
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