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 17.4.9.2 Characters that Cause Signals
 ......................................
 
 These special characters may be active in either canonical or
 noncanonical input mode, but only when the 'ISIG' flag is set (
 Local Modes).
 
  -- Macro: int VINTR
      This is the subscript for the INTR character in the special control
      character array.  'TERMIOS.c_cc[VINTR]' holds the character itself.
 
      The INTR (interrupt) character raises a 'SIGINT' signal for all
      processes in the foreground job associated with the terminal.  The
      INTR character itself is then discarded.   Signal Handling,
      for more information about signals.
 
      Typically, the INTR character is 'C-c'.
 
  -- Macro: int VQUIT
      This is the subscript for the QUIT character in the special control
      character array.  'TERMIOS.c_cc[VQUIT]' holds the character itself.
 
      The QUIT character raises a 'SIGQUIT' signal for all processes in
      the foreground job associated with the terminal.  The QUIT
      character itself is then discarded.   Signal Handling, for
      more information about signals.
 
      Typically, the QUIT character is 'C-\'.
 
  -- Macro: int VSUSP
      This is the subscript for the SUSP character in the special control
      character array.  'TERMIOS.c_cc[VSUSP]' holds the character itself.
 
      The SUSP (suspend) character is recognized only if the
      implementation supports job control ( Job Control).  It
      causes a 'SIGTSTP' signal to be sent to all processes in the
      foreground job associated with the terminal.  The SUSP character
      itself is then discarded.   Signal Handling, for more
      information about signals.
 
      Typically, the SUSP character is 'C-z'.
 
    Few applications disable the normal interpretation of the SUSP
 character.  If your program does this, it should provide some other
 mechanism for the user to stop the job.  When the user invokes this
 mechanism, the program should send a 'SIGTSTP' signal to the process
 group of the process, not just to the process itself.   Signaling
 Another Process.
 
  -- Macro: int VDSUSP
      This is the subscript for the DSUSP character in the special
      control character array.  'TERMIOS.c_cc[VDSUSP]' holds the
      character itself.
 
      The DSUSP (suspend) character is recognized only if the
      implementation supports job control ( Job Control).  It
      sends a 'SIGTSTP' signal, like the SUSP character, but not right
      away--only when the program tries to read it as input.  Not all
      systems with job control support DSUSP; only BSD-compatible systems
      (including GNU/Hurd systems).
 
       Signal Handling, for more information about signals.
 
      Typically, the DSUSP character is 'C-y'.
 

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