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#include "win.h"
#include <errno.h>
#include <io.h>
#ifndef FILE_MAP_EXECUTE
#define FILE_MAP_EXECUTE 0x0020
#endif /* FILE_MAP_EXECUTE */
static int __map_mman_error(const uint32_t err, const int deferr)
{
if (err == 0)
return 0;
//TODO: implement
return err;
}
static uint32_t __map_mmap_prot_page(const int prot)
{
uint32_t 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 uint32_t __map_mmap_prot_file(const int prot)
{
uint32_t 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, ssize_t off)
{
HANDLE fm, h;
void * map = MAP_FAILED;
#ifdef _MSC_VER
#pragma warning(push)
#pragma warning(disable: 4293)
#endif
const uint32_t dwFileOffsetLow = (uint32_t)(off & 0xFFFFFFFFL);
const uint32_t dwFileOffsetHigh = (uint32_t)((off >> 32) & 0xFFFFFFFFL);
const uint32_t protect = __map_mmap_prot_page(prot);
const uint32_t desiredAccess = __map_mmap_prot_file(prot);
const ssize_t maxSize = off + (ssize_t)len;
const uint32_t dwMaxSizeLow = (uint32_t)(maxSize & 0xFFFFFFFFL);
const uint32_t dwMaxSizeHigh = (uint32_t)((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)
{
uint32_t newProtect = __map_mmap_prot_page(prot);
uint32_t 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;
}
// Portable clock_gettime function for Windows
int clock_gettime(int clk_id, struct timespec *tp) {
uint32_t ticks = GetTickCount();
tp->tv_sec = ticks / 1000;
tp->tv_nsec = (ticks % 1000) * 1000000;
return 0;
}
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