174 lines
3.9 KiB
C
174 lines
3.9 KiB
C
#include <windows.h>
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#include <errno.h>
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#include <io.h>
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#include "mman.h"
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#ifndef FILE_MAP_EXECUTE
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#define FILE_MAP_EXECUTE 0x0020
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#endif /* FILE_MAP_EXECUTE */
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static int __map_mman_error(const DWORD err, const int deferr)
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{
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if (err == 0)
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return 0;
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/* TODO: implement */
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return err;
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}
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static DWORD __map_mmap_prot_page(const int prot)
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{
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DWORD protect = 0;
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if (prot == PROT_NONE)
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return 0;
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if ((prot & PROT_EXEC) != 0)
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protect = ((prot & PROT_WRITE) != 0) ?
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PAGE_EXECUTE_READWRITE : PAGE_EXECUTE_READ;
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else
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protect = ((prot & PROT_WRITE) != 0) ?
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PAGE_READWRITE : PAGE_READONLY;
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return protect;
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}
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static DWORD __map_mmap_prot_file(const int prot)
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{
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DWORD desiredAccess = 0;
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if (prot == PROT_NONE)
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return 0;
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if ((prot & PROT_READ) != 0)
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desiredAccess |= FILE_MAP_READ;
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if ((prot & PROT_WRITE) != 0)
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desiredAccess |= FILE_MAP_WRITE;
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if ((prot & PROT_EXEC) != 0)
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desiredAccess |= FILE_MAP_EXECUTE;
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return desiredAccess;
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}
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void* mmap(void *addr, size_t len, int prot, int flags, int fildes, off_t off)
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{
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HANDLE fm, h;
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void * map = MAP_FAILED;
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#ifdef _MSC_VER
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#pragma warning(push)
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#pragma warning(disable: 4293)
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#endif
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const DWORD dwFileOffsetLow = (sizeof(off_t) <= sizeof(DWORD)) ?
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(DWORD)off : (DWORD)(off & 0xFFFFFFFFL);
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const DWORD dwFileOffsetHigh = (sizeof(off_t) <= sizeof(DWORD)) ?
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(DWORD)0 : (DWORD)((off >> 32) & 0xFFFFFFFFL);
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const DWORD protect = __map_mmap_prot_page(prot);
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const DWORD desiredAccess = __map_mmap_prot_file(prot);
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const off_t maxSize = off + (off_t)len;
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const DWORD dwMaxSizeLow = (sizeof(off_t) <= sizeof(DWORD)) ?
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(DWORD)maxSize : (DWORD)(maxSize & 0xFFFFFFFFL);
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const DWORD dwMaxSizeHigh = (sizeof(off_t) <= sizeof(DWORD)) ?
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(DWORD)0 : (DWORD)((maxSize >> 32) & 0xFFFFFFFFL);
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#ifdef _MSC_VER
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#pragma warning(pop)
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#endif
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errno = 0;
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if (len == 0
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/* Unsupported flag combinations */
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|| (flags & MAP_FIXED) != 0
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/* Usupported protection combinations */
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|| prot == PROT_EXEC)
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{
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errno = EINVAL;
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return MAP_FAILED;
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}
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h = ((flags & MAP_ANONYMOUS) == 0) ?
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(HANDLE)_get_osfhandle(fildes) : INVALID_HANDLE_VALUE;
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if ((flags & MAP_ANONYMOUS) == 0 && h == INVALID_HANDLE_VALUE)
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{
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errno = EBADF;
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return MAP_FAILED;
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}
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fm = CreateFileMapping(h, NULL, protect, dwMaxSizeHigh, dwMaxSizeLow, NULL);
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if (!fm)
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goto error;
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map = MapViewOfFile(fm, desiredAccess, dwFileOffsetHigh, dwFileOffsetLow, len);
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CloseHandle(fm);
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if (!map)
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goto error;
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return map;
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error:
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errno = __map_mman_error(GetLastError(), EPERM);
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return MAP_FAILED;
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}
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int munmap(void *addr, size_t len)
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{
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if (UnmapViewOfFile(addr))
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return 0;
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errno = __map_mman_error(GetLastError(), EPERM);
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return -1;
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}
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int mprotect(void *addr, size_t len, int prot)
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{
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DWORD newProtect = __map_mmap_prot_page(prot);
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DWORD oldProtect = 0;
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if (VirtualProtect(addr, len, newProtect, &oldProtect))
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return 0;
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errno = __map_mman_error(GetLastError(), EPERM);
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return -1;
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}
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int msync(void *addr, size_t len, int flags)
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{
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if (FlushViewOfFile(addr, len))
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return 0;
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errno = __map_mman_error(GetLastError(), EPERM);
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return -1;
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}
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int mlock(const void *addr, size_t len)
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{
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if (VirtualLock((LPVOID)addr, len))
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return 0;
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errno = __map_mman_error(GetLastError(), EPERM);
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return -1;
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}
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int munlock(const void *addr, size_t len)
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{
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if (VirtualUnlock((LPVOID)addr, len))
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return 0;
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errno = __map_mman_error(GetLastError(), EPERM);
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return -1;
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}
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