title: How to identify an unknown exit code?
body: <p>I have the problem that a Mac application I wrote often suddenly exits with a for me unknown exit code 33 and without any further indication of what went wrong. I already searched the whole source code for the number 33, but I couldn't find anything (I was hoping for a line of code like <code>exit(33)</code>).</p>
  
  <p>Can you give me any hint how I could track down this problem? Is there a way for example to set a breakpoint into the exit-function or something like that?</p>