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| <h3 class="section">2.17 <code>exit</code>—end program execution</h3> |
| |
| <p><a name="index-exit-30"></a><strong>Synopsis</strong> |
| <pre class="example"> #include <stdlib.h> |
| void exit(int <var>code</var>); |
| |
| </pre> |
| <p><strong>Description</strong><br> |
| Use <code>exit</code> to return control from a program to the host operating |
| environment. Use the argument <var>code</var> to pass an exit status to the |
| operating environment: two particular values, <code>EXIT_SUCCESS</code> and |
| <code>EXIT_FAILURE</code>, are defined in `<code>stdlib.h</code>' to indicate success or |
| failure in a portable fashion. |
| |
| <p><code>exit</code> does two kinds of cleanup before ending execution of your |
| program. First, it calls all application-defined cleanup functions |
| you have enrolled with <code>atexit</code>. Second, files and streams are |
| cleaned up: any pending output is delivered to the host system, each |
| open file or stream is closed, and files created by <code>tmpfile</code> are |
| deleted. |
| |
| <p><br> |
| <strong>Returns</strong><br> |
| <code>exit</code> does not return to its caller. |
| |
| <p><br> |
| <strong>Portability</strong><br> |
| ANSI C requires <code>exit</code>, and specifies that <code>EXIT_SUCCESS</code> and |
| <code>EXIT_FAILURE</code> must be defined. |
| |
| <p>Supporting OS subroutines required: <code>_exit</code>. |
| |
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