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| <h5 class="subsubsection">17.4.9.2 Characters that Cause Signals</h5> |
| |
| <p>These special characters may be active in either canonical or noncanonical |
| input mode, but only when the <code>ISIG</code> flag is set (see <a href="Local-Modes.html#Local-Modes">Local Modes</a>). |
| |
| <!-- termios.h --> |
| <!-- POSIX.1 --> |
| <div class="defun"> |
| — Macro: int <b>VINTR</b><var><a name="index-VINTR-1971"></a></var><br> |
| <blockquote><p><a name="index-INTR-character-1972"></a><a name="index-interrupt-character-1973"></a>This is the subscript for the INTR character in the special control |
| character array. <var>termios</var><code>.c_cc[VINTR]</code> holds the character |
| itself. |
| |
| <p>The INTR (interrupt) character raises a <code>SIGINT</code> signal for all |
| processes in the foreground job associated with the terminal. The INTR |
| character itself is then discarded. See <a href="Signal-Handling.html#Signal-Handling">Signal Handling</a>, for more |
| information about signals. |
| |
| <p>Typically, the INTR character is <kbd>C-c</kbd>. |
| </p></blockquote></div> |
| |
| <!-- termios.h --> |
| <!-- POSIX.1 --> |
| <div class="defun"> |
| — Macro: int <b>VQUIT</b><var><a name="index-VQUIT-1974"></a></var><br> |
| <blockquote><p><a name="index-QUIT-character-1975"></a>This is the subscript for the QUIT character in the special control |
| character array. <var>termios</var><code>.c_cc[VQUIT]</code> holds the character |
| itself. |
| |
| <p>The QUIT character raises a <code>SIGQUIT</code> signal for all processes in |
| the foreground job associated with the terminal. The QUIT character |
| itself is then discarded. See <a href="Signal-Handling.html#Signal-Handling">Signal Handling</a>, for more information |
| about signals. |
| |
| <p>Typically, the QUIT character is <kbd>C-\</kbd>. |
| </p></blockquote></div> |
| |
| <!-- termios.h --> |
| <!-- POSIX.1 --> |
| <div class="defun"> |
| — Macro: int <b>VSUSP</b><var><a name="index-VSUSP-1976"></a></var><br> |
| <blockquote><p><a name="index-SUSP-character-1977"></a><a name="index-suspend-character-1978"></a>This is the subscript for the SUSP character in the special control |
| character array. <var>termios</var><code>.c_cc[VSUSP]</code> holds the character |
| itself. |
| |
| <p>The SUSP (suspend) character is recognized only if the implementation |
| supports job control (see <a href="Job-Control.html#Job-Control">Job Control</a>). It causes a <code>SIGTSTP</code> |
| signal to be sent to all processes in the foreground job associated with |
| the terminal. The SUSP character itself is then discarded. |
| See <a href="Signal-Handling.html#Signal-Handling">Signal Handling</a>, for more information about signals. |
| |
| <p>Typically, the SUSP character is <kbd>C-z</kbd>. |
| </p></blockquote></div> |
| |
| <p>Few applications disable the normal interpretation of the SUSP |
| character. If your program does this, it should provide some other |
| mechanism for the user to stop the job. When the user invokes this |
| mechanism, the program should send a <code>SIGTSTP</code> signal to the |
| process group of the process, not just to the process itself. |
| See <a href="Signaling-Another-Process.html#Signaling-Another-Process">Signaling Another Process</a>. |
| |
| <!-- termios.h --> |
| <!-- BSD --> |
| <div class="defun"> |
| — Macro: int <b>VDSUSP</b><var><a name="index-VDSUSP-1979"></a></var><br> |
| <blockquote><p><a name="index-DSUSP-character-1980"></a><a name="index-delayed-suspend-character-1981"></a>This is the subscript for the DSUSP character in the special control |
| character array. <var>termios</var><code>.c_cc[VDSUSP]</code> holds the character |
| itself. |
| |
| <p>The DSUSP (suspend) character is recognized only if the implementation |
| supports job control (see <a href="Job-Control.html#Job-Control">Job Control</a>). It sends a <code>SIGTSTP</code> |
| signal, like the SUSP character, but not right away—only when the |
| program tries to read it as input. Not all systems with job control |
| support DSUSP; only BSD-compatible systems (including the GNU system). |
| |
| <p>See <a href="Signal-Handling.html#Signal-Handling">Signal Handling</a>, for more information about signals. |
| |
| <p>Typically, the DSUSP character is <kbd>C-y</kbd>. |
| </p></blockquote></div> |
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