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' (Note: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.