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exit
====

Syntax
------

     #include <stdlib.h>
     
     void exit(int exit_code);

Description
-----------

This function exits the program, returning EXIT_CODE to the calling
process.  Before exiting, all open files are closed and all `atexit'
and `on_exit' requests are processed.

Return Value
------------

This function does not return.

Example
-------

     if (argc < 4)
     {
       print_usage();
       exit(1);
     }