(libc.info.gz) Miscellaneous Signals

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 24.2.7 Miscellaneous Signals
 ----------------------------
 
 These signals are used for various other purposes.  In general, they
 will not affect your program unless it explicitly uses them for
 something.
 
  -- Macro: int SIGUSR1
  -- Macro: int SIGUSR2
      The `SIGUSR1' and `SIGUSR2' signals are set aside for you to use
      any way you want.  They're useful for simple interprocess
      communication, if you write a signal handler for them in the
      program that receives the signal.
 
      There is an example showing the use of `SIGUSR1' and `SIGUSR2' in
       Signaling Another Process.
 
      The default action is to terminate the process.
 
  -- Macro: int SIGWINCH
      Window size change.  This is generated on some systems (including
      GNU) when the terminal driver's record of the number of rows and
      columns on the screen is changed.  The default action is to ignore
      it.
 
      If a program does full-screen display, it should handle `SIGWINCH'.
      When the signal arrives, it should fetch the new screen size and
      reformat its display accordingly.
 
  -- Macro: int SIGINFO
      Information request.  In 4.4 BSD and the GNU system, this signal
      is sent to all the processes in the foreground process group of
      the controlling terminal when the user types the STATUS character
      in canonical mode;  Signal Characters.
 
      If the process is the leader of the process group, the default
      action is to print some status information about the system and
      what the process is doing.  Otherwise the default is to do nothing.
 

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