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| <h4 class="subsection">17.4.9 Special Characters</h4> |
| |
| <p>In canonical input, the terminal driver recognizes a number of special |
| characters which perform various control functions. These include the |
| ERASE character (usually <DEL>) for editing input, and other editing |
| characters. The INTR character (normally <kbd>C-c</kbd>) for sending a |
| <code>SIGINT</code> signal, and other signal-raising characters, may be |
| available in either canonical or noncanonical input mode. All these |
| characters are described in this section. |
| |
| <p>The particular characters used are specified in the <code>c_cc</code> member |
| of the <code>struct termios</code> structure. This member is an array; each |
| element specifies the character for a particular role. Each element has |
| a symbolic constant that stands for the index of that element—for |
| example, <code>VINTR</code> is the index of the element that specifies the INTR |
| character, so storing <code>'='</code> in <var>termios</var><code>.c_cc[VINTR]</code> |
| specifies ‘<samp><span class="samp">=</span></samp>’ as the INTR character. |
| |
| <p><a name="index-g_t_005fPOSIX_005fVDISABLE-1956"></a>On some systems, you can disable a particular special character function |
| by specifying the value <code>_POSIX_VDISABLE</code> for that role. This |
| value is unequal to any possible character code. See <a href="Options-for-Files.html#Options-for-Files">Options for Files</a>, for more information about how to tell whether the operating |
| system you are using supports <code>_POSIX_VDISABLE</code>. |
| |
| <ul class="menu"> |
| <li><a accesskey="1" href="Editing-Characters.html#Editing-Characters">Editing Characters</a>: Special characters that terminate lines and |
| delete text, and other editing functions. |
| <li><a accesskey="2" href="Signal-Characters.html#Signal-Characters">Signal Characters</a>: Special characters that send or raise signals |
| to or for certain classes of processes. |
| <li><a accesskey="3" href="Start_002fStop-Characters.html#Start_002fStop-Characters">Start/Stop Characters</a>: Special characters that suspend or resume |
| suspended output. |
| <li><a accesskey="4" href="Other-Special.html#Other-Special">Other Special</a>: Other special characters for BSD systems: |
| they can discard output, and print status. |
| </ul> |
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