Computer Programming #1 - IsDebuggerPresent

This is the main code to execute to check if a debugger using Microsoft's API is working. I'll check for gdb code and post it here if I have time.

unsigned long IsDebuggerPresent()

{

  unsigned long ret;

  __asm {

    mov   eax, fs:[0x18]

    mov   eax, [eax + 0x30]

    movzx ret, [eax + 0x02]

  }

  return ret;

}

In fact, not too much has been done: I've disassembled kernel32.dll, checked the code for the already available IsDebuggerPresent and put it in a function :P I'll check for the flags in fs:[0x18] or even other fs segment variable. They seem interesting. Will post it here :)