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  Include:   <stdlib.h>
 
  Syntax:    int atexit( void (*func)( void ) );
             onexit_t onexit( onexit_t func );
 
  Returns:   (atexit) 0 if successful; otherwise a nonzero value.
             (onexit) a pointer to <func> if successful; otherwise a
                      NULL pointer.
 
  See also:  abort, exit
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