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freopen
=======

Syntax
------

     #include <stdio.h>
     
     FILE *freopen(const char *filename, const char *mode, FILE *file);

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

This function closes FILE if it was open, then opens a new file like
`fopen(filename, mode)' but it reuses FILE.

This is useful to, for example, associate `stdout' with a new file.

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

The new file, or `NULL' on error.

Example
-------

     freopen("/tmp/stdout.dat", "wb", stdout);