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__file_exists
=============

Syntax
------

     #include <unistd.h>
     
     int __file_exists(const char *_fn);

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

This function provides a fast way to ask if a given file exists.
Unlike access(), this function does not cause other objects to get
linked in with your program, so is used primarily by the startup code
to keep minimum code size small.

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

Zero if the file does not exist, nonzero if it does.  Note that this is
the opposite of what access() returns.

Example
-------


     if (__file_exists(fname))
       process_file(fname);