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| <h4 class="subsection">25.6.1 Normal Termination</h4> |
| |
| <p>A process terminates normally when its program signals it is done by |
| calling <code>exit</code>. Returning from <code>main</code> is equivalent to |
| calling <code>exit</code>, and the value that <code>main</code> returns is used as |
| the argument to <code>exit</code>. |
| |
| <!-- stdlib.h --> |
| <!-- ISO --> |
| <div class="defun"> |
| — Function: void <b>exit</b> (<var>int status</var>)<var><a name="index-exit-3134"></a></var><br> |
| <blockquote><p>The <code>exit</code> function tells the system that the program is done, which |
| causes it to terminate the process. |
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| <p><var>status</var> is the program's exit status, which becomes part of the |
| process' termination status. This function does not return. |
| </p></blockquote></div> |
| |
| <p>Normal termination causes the following actions: |
| |
| <ol type=1 start=1> |
| <li>Functions that were registered with the <code>atexit</code> or <code>on_exit</code> |
| functions are called in the reverse order of their registration. This |
| mechanism allows your application to specify its own “cleanup” actions |
| to be performed at program termination. Typically, this is used to do |
| things like saving program state information in a file, or unlocking |
| locks in shared data bases. |
| |
| <li>All open streams are closed, writing out any buffered output data. See |
| <a href="Closing-Streams.html#Closing-Streams">Closing Streams</a>. In addition, temporary files opened |
| with the <code>tmpfile</code> function are removed; see <a href="Temporary-Files.html#Temporary-Files">Temporary Files</a>. |
| |
| <li><code>_exit</code> is called, terminating the program. See <a href="Termination-Internals.html#Termination-Internals">Termination Internals</a>. |
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