title: Why does msgrcv() return error with errno=7 (E2BIG)?
body: <p>I've built a small example that uses <a href="http://linux.die.net/man/2/msgsnd" rel="nofollow">msgsnd and msgrcv</a>, but sometimes <code>msgrcv()</code> returns 
  <code>E2BIG</code>, and I'm not sure why that is, since I pass is the same <code>msgsz</code> to both <code>msgsnd()</code> and <code>msgrcv()</code>.</p>