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Other Special Characters
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   These special characters exist only in BSD systems and the GNU
system.

 - Macro: int VLNEXT
     This is the subscript for the LNEXT character in the special
     control character array.  `TERMIOS.c_cc[VLNEXT]' holds the
     character itself.

     The LNEXT character is recognized only when `IEXTEN' is set, but in
     both canonical and noncanonical mode.  It disables any special
     significance of the next character the user types.  Even if the
     character would normally perform some editing function or generate
     a signal, it is read as a plain character.  This is the analogue
     of the `C-q' command in Emacs.  "LNEXT" stands for "literal next."

     The LNEXT character is usually `C-v'.

 - Macro: int VDISCARD
     This is the subscript for the DISCARD character in the special
     control character array.  `TERMIOS.c_cc[VDISCARD]' holds the
     character itself.

     The DISCARD character is recognized only when `IEXTEN' is set, but
     in both canonical and noncanonical mode.  Its effect is to toggle
     the discard-output flag.  When this flag is set, all program
     output is discarded.  Setting the flag also discards all output
     currently in the output buffer.  Typing any other character resets
     the flag.

 - Macro: int VSTATUS
     This is the subscript for the STATUS character in the special
     control character array.  `TERMIOS.c_cc[VSTATUS]' holds the
     character itself.

     The STATUS character's effect is to print out a status message
     about how the current process is running.

     The STATUS character is recognized only in canonical mode, and
     only if `NOKERNINFO' is not set.