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| <h3 class="section">25.6 Program Termination</h3> |
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| <p><a name="index-program-termination-3131"></a><a name="index-process-termination-3132"></a> |
| <a name="index-exit-status-value-3133"></a>The usual way for a program to terminate is simply for its <code>main</code> |
| function to return. The <dfn>exit status value</dfn> returned from the |
| <code>main</code> function is used to report information back to the process's |
| parent process or shell. |
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| <p>A program can also terminate normally by calling the <code>exit</code> |
| function. |
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| <p>In addition, programs can be terminated by signals; this is discussed in |
| more detail in <a href="Signal-Handling.html#Signal-Handling">Signal Handling</a>. The <code>abort</code> function causes |
| a signal that kills the program. |
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| <li><a accesskey="1" href="Normal-Termination.html#Normal-Termination">Normal Termination</a>: If a program calls <code>exit</code>, a |
| process terminates normally. |
| <li><a accesskey="2" href="Exit-Status.html#Exit-Status">Exit Status</a>: The <code>exit status</code> provides information |
| about why the process terminated. |
| <li><a accesskey="3" href="Cleanups-on-Exit.html#Cleanups-on-Exit">Cleanups on Exit</a>: A process can run its own cleanup |
| functions upon normal termination. |
| <li><a accesskey="4" href="Aborting-a-Program.html#Aborting-a-Program">Aborting a Program</a>: The <code>abort</code> function causes |
| abnormal program termination. |
| <li><a accesskey="5" href="Termination-Internals.html#Termination-Internals">Termination Internals</a>: What happens when a process terminates. |
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