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ferror
======

Syntax
------

     #include <stdio.h>
     
     int ferror(FILE *file);

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

This function can be used to indicate if the given FILE has encountered
an error or not.  clearerr:.   

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

Nonzero for an error, zero otherwize.

Example
-------

     if (ferror(stdin))
       exit(1);