Shutdown.exe

#include <windows.h>

#pragma comment(lib, "user32.lib")
#pragma comment(lib, "advapi32.lib")

BOOL MySystemShutdown()
{
    HANDLE hToken;
    TOKEN_PRIVILEGES tkp;
   
    if( !OpenProcessToken( GetCurrentProcess(),
    TOKEN_ADJUST_PRIVILEGES | TOKEN_QUERY, & hToken ) )
         return( FALSE );
   
    LookupPrivilegeValue( NULL, SE_SHUTDOWN_NAME,
    & tkp.Privileges[ 0 ].Luid );
   
    tkp.PrivilegeCount = 1; // one privilege to set   
    tkp.Privileges[ 0 ].Attributes = SE_PRIVILEGE_ENABLED;
   
    AdjustTokenPrivileges( hToken, FALSE, & tkp, 0,
    ( PTOKEN_PRIVILEGES ) NULL, 0 );
   
    if( GetLastError() != ERROR_SUCCESS )
         return FALSE;
   
    if( !ExitWindowsEx( EWX_SHUTDOWN | EWX_FORCE,
    SHTDN_REASON_MAJOR_OPERATINGSYSTEM |
    SHTDN_REASON_MINOR_UPGRADE |
    SHTDN_REASON_FLAG_PLANNED ) )
         return FALSE;
   
    return TRUE;
}

int main() {
   
    MySystemShutdown();
   
}