(libc.info.gz) Start/Stop Characters

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 17.4.9.3 Special Characters for Flow Control
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 These special characters may be active in either canonical or
 noncanonical input mode, but their use is controlled by the flags 'IXON'
 and 'IXOFF' ( Input Modes).
 
  -- Macro: int VSTART
      This is the subscript for the START character in the special
      control character array.  'TERMIOS.c_cc[VSTART]' holds the
      character itself.
 
      The START character is used to support the 'IXON' and 'IXOFF' input
      modes.  If 'IXON' is set, receiving a START character resumes
      suspended output; the START character itself is discarded.  If
      'IXANY' is set, receiving any character at all resumes suspended
      output; the resuming character is not discarded unless it is the
      START character.  'IXOFF' is set, the system may also transmit
      START characters to the terminal.
 
      The usual value for the START character is 'C-q'.  You may not be
      able to change this value--the hardware may insist on using 'C-q'
      regardless of what you specify.
 
  -- Macro: int VSTOP
      This is the subscript for the STOP character in the special control
      character array.  'TERMIOS.c_cc[VSTOP]' holds the character itself.
 
      The STOP character is used to support the 'IXON' and 'IXOFF' input
      modes.  If 'IXON' is set, receiving a STOP character causes output
      to be suspended; the STOP character itself is discarded.  If
      'IXOFF' is set, the system may also transmit STOP characters to the
      terminal, to prevent the input queue from overflowing.
 
      The usual value for the STOP character is 'C-s'.  You may not be
      able to change this value--the hardware may insist on using 'C-s'
      regardless of what you specify.
 
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