freopen
=======

POSIX specification: http://www.opengroup.org/susv3xsh/freopen.html

Gnulib module: freopen

Portability problems fixed by Gnulib:

  * On Windows platforms (excluding Cygwin), this function does usually not recognize the /dev/null filename.

Portability problems not fixed by Gnulib:

  * On Windows platforms (excluding Cygwin), this function does not set errno upon failure.