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| <h4 class="subsection">24.2.7 Miscellaneous Signals</h4> |
| |
| <p>These signals are used for various other purposes. In general, they |
| will not affect your program unless it explicitly uses them for something. |
| |
| <!-- signal.h --> |
| <!-- POSIX.1 --> |
| <div class="defun"> |
| — Macro: int <b>SIGUSR1</b><var><a name="index-SIGUSR1-2894"></a></var><br> |
| <blockquote><!-- signal.h --> |
| <!-- POSIX.1 --> |
| — Macro: int <b>SIGUSR2</b><var><a name="index-SIGUSR2-2895"></a></var><br> |
| <blockquote><p><a name="index-user-signals-2896"></a>The <code>SIGUSR1</code> and <code>SIGUSR2</code> signals are set aside for you to |
| use any way you want. They're useful for simple interprocess |
| communication, if you write a signal handler for them in the program |
| that receives the signal. |
| |
| <p>There is an example showing the use of <code>SIGUSR1</code> and <code>SIGUSR2</code> |
| in <a href="Signaling-Another-Process.html#Signaling-Another-Process">Signaling Another Process</a>. |
| |
| <p>The default action is to terminate the process. |
| </p></blockquote></div> |
| |
| <!-- signal.h --> |
| <!-- BSD --> |
| <div class="defun"> |
| — Macro: int <b>SIGWINCH</b><var><a name="index-SIGWINCH-2897"></a></var><br> |
| <blockquote><p>Window size change. This is generated on some systems (including GNU) |
| when the terminal driver's record of the number of rows and columns on |
| the screen is changed. The default action is to ignore it. |
| |
| <p>If a program does full-screen display, it should handle <code>SIGWINCH</code>. |
| When the signal arrives, it should fetch the new screen size and |
| reformat its display accordingly. |
| </p></blockquote></div> |
| |
| <!-- signal.h --> |
| <!-- BSD --> |
| <div class="defun"> |
| — Macro: int <b>SIGINFO</b><var><a name="index-SIGINFO-2898"></a></var><br> |
| <blockquote><p>Information request. In 4.4 BSD and the GNU system, this signal is sent |
| to all the processes in the foreground process group of the controlling |
| terminal when the user types the STATUS character in canonical mode; |
| see <a href="Signal-Characters.html#Signal-Characters">Signal Characters</a>. |
| |
| <p>If the process is the leader of the process group, the default action is |
| to print some status information about the system and what the process |
| is doing. Otherwise the default is to do nothing. |
| </p></blockquote></div> |
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