#include <windows.h>
#include <tchar.h>
#include <stdio.h>
#define BUF_SIZE 65536
TCHAR szName[]=TEXT("LARGEPAGE");
typedef int (*GETLARGEPAGEMINIMUM)(void);
void DisplayError(TCHAR* pszAPI, DWORD dwError)
{
LPVOID lpvMessageBuffer;
FormatMessage(FORMAT_MESSAGE_ALLOCATE_BUFFER |
FORMAT_MESSAGE_FROM_SYSTEM |
FORMAT_MESSAGE_IGNORE_INSERTS,
NULL, dwError,
MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT),
(LPTSTR)&lpvMessageBuffer, 0, NULL);
//... now display this string
_tprintf(TEXT("ERROR: API = %s\n"), pszAPI);
_tprintf(TEXT(" error code = %d\n"), dwError);
_tprintf(TEXT(" message = %s\n"), lpvMessageBuffer);
// Free the buffer allocated by the system
LocalFree(lpvMessageBuffer);
ExitProcess(GetLastError());
}
void Privilege(TCHAR* pszPrivilege, BOOL bEnable)
{
HANDLE hToken;
TOKEN_PRIVILEGES tp;
// open process token
if (!OpenProcessToken(GetCurrentProcess(), TOKEN_ADJUST_PRIVILEGES | TOKEN_QUERY, &hToken))
DisplayError(TEXT("OpenProcessToken"), GetLastError());
// get the luid
if (!LookupPrivilegeValue(NULL, pszPrivilege, &tp.Privileges[0].Luid))
DisplayError(TEXT("LookupPrivilegeValue"), GetLastError());
tp.PrivilegeCount = 1;
// enable or disable privilege
if (bEnable)
tp.Privileges[0].Attributes = SE_PRIVILEGE_ENABLED;
else
tp.Privileges[0].Attributes = 0;
// enable or disable privilege
if (!AdjustTokenPrivileges(hToken, FALSE, &tp, 0, (PTOKEN_PRIVILEGES)NULL, 0))
DisplayError(TEXT("AdjustTokenPrivileges"), GetLastError());
// close the handle
if (!CloseHandle(hToken))
DisplayError(TEXT("CloseHandle"), GetLastError());
}
void main(void)
{
HANDLE hMapFile;
LPCTSTR pBuf;
SIZE_T size;
GETLARGEPAGEMINIMUM pGetLargePageMinimum;
HINSTANCE hDll;
// call succeeds only on Windows Server 2003 SP1 or later
hDll = LoadLibrary(TEXT("kernel32.dll"));
if (hDll == NULL)
DisplayError(TEXT("LoadLibrary"), GetLastError());
pGetLargePageMinimum = (GETLARGEPAGEMINIMUM)GetProcAddress(hDll,
"GetLargePageMinimum");
if (pGetLargePageMinimum == NULL)
DisplayError(TEXT("GetProcAddress"), GetLastError());
size = (*pGetLargePageMinimum)();
FreeLibrary(hDll);
printf("Page Size: %u\n", size);
Privilege(TEXT("SeLockMemoryPrivilege"), TRUE);
hMapFile = CreateFileMapping(
INVALID_HANDLE_VALUE, // use paging file
NULL, // default security
PAGE_READWRITE | SEC_COMMIT | SEC_LARGE_PAGES,
0, // max. object size
size, // buffer size
szName); // name of mapping object
if (hMapFile == NULL)
DisplayError(TEXT("CreateFileMapping"), GetLastError());
else
printf("File mapping object successfulyl created.\n");
Privilege(TEXT("SeLockMemoryPrivilege"), FALSE);
pBuf = (LPTSTR) MapViewOfFile(hMapFile, // handle to map object
FILE_MAP_ALL_ACCESS, // read/write permission
0,
0,
BUF_SIZE);
if (pBuf == NULL)
DisplayError(TEXT("MapViewOfFile"), GetLastError());
else
printf("View of file successfully mapped.\n");
// do nothing, clean up an exit
UnmapViewOfFile(pBuf);
CloseHandle(hMapFile);
}