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| <h5 class="subsubsection">17.4.9.3 Special Characters for Flow Control</h5> |
| |
| <p>These special characters may be active in either canonical or noncanonical |
| input mode, but their use is controlled by the flags <code>IXON</code> and |
| <code>IXOFF</code> (see <a href="Input-Modes.html#Input-Modes">Input Modes</a>). |
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| <!-- termios.h --> |
| <!-- POSIX.1 --> |
| <div class="defun"> |
| — Macro: int <b>VSTART</b><var><a name="index-VSTART-1982"></a></var><br> |
| <blockquote><p><a name="index-START-character-1983"></a>This is the subscript for the START character in the special control |
| character array. <var>termios</var><code>.c_cc[VSTART]</code> holds the |
| character itself. |
| |
| <p>The START character is used to support the <code>IXON</code> and <code>IXOFF</code> |
| input modes. If <code>IXON</code> is set, receiving a START character resumes |
| suspended output; the START character itself is discarded. If |
| <code>IXANY</code> is set, receiving any character at all resumes suspended |
| output; the resuming character is not discarded unless it is the START |
| character. <code>IXOFF</code> is set, the system may also transmit START |
| characters to the terminal. |
| |
| <p>The usual value for the START character is <kbd>C-q</kbd>. You may not be |
| able to change this value—the hardware may insist on using <kbd>C-q</kbd> |
| regardless of what you specify. |
| </p></blockquote></div> |
| |
| <!-- termios.h --> |
| <!-- POSIX.1 --> |
| <div class="defun"> |
| — Macro: int <b>VSTOP</b><var><a name="index-VSTOP-1984"></a></var><br> |
| <blockquote><p><a name="index-STOP-character-1985"></a>This is the subscript for the STOP character in the special control |
| character array. <var>termios</var><code>.c_cc[VSTOP]</code> holds the character |
| itself. |
| |
| <p>The STOP character is used to support the <code>IXON</code> and <code>IXOFF</code> |
| input modes. If <code>IXON</code> is set, receiving a STOP character causes |
| output to be suspended; the STOP character itself is discarded. If |
| <code>IXOFF</code> is set, the system may also transmit STOP characters to the |
| terminal, to prevent the input queue from overflowing. |
| |
| <p>The usual value for the STOP character is <kbd>C-s</kbd>. You may not be |
| able to change this value—the hardware may insist on using <kbd>C-s</kbd> |
| regardless of what you specify. |
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