Why do I keep getting EINTR from the socket calls?

Why do I keep getting EINTR from the socket calls? 

  This isn't really so much an error as an exit condition.  It means
  that the call was interrupted by a signal.  Any call that might block
  should be wrapped in a loop that checkes for EINTR, as is done in the
  example code (See ``6. Sample Source Code'').

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