using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Security.Permissions;
using Microsoft.Win32;
using System.Runtime.InteropServices;
using System.Diagnostics;
using System.Collections;
using System.Threading;
using System.Security.AccessControl;
using System.Security.Principal;
using Microsoft.Win32.SafeHandles;
namespace EnumerateMutexACL
{
    class Win
    {
        [DllImport("kernel32.dll", CharSet = CharSet.Auto, SetLastError = true)]
        public static extern SafeWaitHandle OpenMutex(UInt32 desiredAccess, bool inheritHandle, string name);

        [DllImport("kernel32.dll", SetLastError = true)]
        [return: MarshalAs(UnmanagedType.Bool)]
        public static extern bool DuplicateHandle(IntPtr hSourceProcessHandle,
           IntPtr hSourceHandle, IntPtr hTargetProcessHandle, out IntPtr lpTargetHandle,
           uint dwDesiredAccess, [MarshalAs(UnmanagedType.Bool)] bool bInheritHandle, uint dwOptions);

        [DllImport("kernel32.dll", SetLastError = true)]
        [return: MarshalAs(UnmanagedType.Bool)]
        public static extern bool CloseHandle(IntPtr hObject);
    }

    class Program
    {
        static void Main(string[] args)
        {
            const UInt32 MUTEX_ALL_ACCESS = 0x1F0001;
            const uint DUPLICATE_CLOSE_SOURCE = 0x00000001;


            Process proc = Process.GetProcessesByName("notepad")[0];
            IntPtr p = proc.Handle;

            SafeWaitHandle hMutex = Win.OpenMutex(MUTEX_ALL_ACCESS, false, "MSCTF.Asm.MutexDefault1");
            IntPtr pp = hMutex.DangerousGetHandle();

            IntPtr ppp = Process.GetCurrentProcess().Handle;
            IntPtr pppp = IntPtr.Zero; // System.Diagnostics.Process.Start("calc").Handle;
            Win.DuplicateHandle(p, pp, ppp, out pppp, MUTEX_ALL_ACCESS, false, DUPLICATE_CLOSE_SOURCE);
            Win.CloseHandle(pppp);

            if (Win.OpenMutex(MUTEX_ALL_ACCESS, false, "MSCTF.Asm.MutexDefault1").DangerousGetHandle() == IntPtr.Zero)
                Console.Write("Success");
            else
                Console.Write("Failed");


            Console.Read();

            return;
        }
    }
}