(libc.info.gz) Asynchronous I/O Signals

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 24.2.4 Asynchronous I/O Signals
 -------------------------------
 
 The signals listed in this section are used in conjunction with
 asynchronous I/O facilities.  You have to take explicit action by
 calling `fcntl' to enable a particular file descriptor to generate
 these signals ( Interrupt Input).  The default action for these
 signals is to ignore them.
 
  -- Macro: int SIGIO
      This signal is sent when a file descriptor is ready to perform
      input or output.
 
      On most operating systems, terminals and sockets are the only
      kinds of files that can generate `SIGIO'; other kinds, including
      ordinary files, never generate `SIGIO' even if you ask them to.
 
      In the GNU system `SIGIO' will always be generated properly if you
      successfully set asynchronous mode with `fcntl'.
 
  -- Macro: int SIGURG
      This signal is sent when "urgent" or out-of-band data arrives on a
      socket.   Out-of-Band Data.
 
  -- Macro: int SIGPOLL
      This is a System V signal name, more or less similar to `SIGIO'.
      It is defined only for compatibility.
 

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