title: fopen for writing but not exclusive
body: <p>I want to use <code>fopen("file", "w")</code> to open a file for writing but not exclusive. I.e. I want to have another process read the file while it is still open.</p>
  
  <p>Note that I have a flush after every line so I won't miss anything. Writing will be idle at the time the other process reads from the file.</p>
  
  <p>The documentation does not mention exclusive but experimenting shows that it is exclusive.</p>
  
  <p>Is there a way?</p>