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<h3 class="section">17.8 Reading and writing random number generator state</h3>
<p>The library provides functions for reading and writing the random
number state to a file as binary data or formatted text.
<div class="defun">
— Function: int <b>gsl_rng_fwrite</b> (<var>FILE * stream, const gsl_rng * r</var>)<var><a name="index-gsl_005frng_005ffwrite-1494"></a></var><br>
<blockquote><p>This function writes the random number state of the random number
generator <var>r</var> to the stream <var>stream</var> in binary format. The
return value is 0 for success and <code>GSL_EFAILED</code> if there was a
problem writing to the file. Since the data is written in the native
binary format it may not be portable between different architectures.
</p></blockquote></div>
<div class="defun">
— Function: int <b>gsl_rng_fread</b> (<var>FILE * stream, gsl_rng * r</var>)<var><a name="index-gsl_005frng_005ffread-1495"></a></var><br>
<blockquote><p>This function reads the random number state into the random number
generator <var>r</var> from the open stream <var>stream</var> in binary format.
The random number generator <var>r</var> must be preinitialized with the
correct random number generator type since type information is not
saved. The return value is 0 for success and <code>GSL_EFAILED</code> if
there was a problem reading from the file. The data is assumed to
have been written in the native binary format on the same
architecture.
</p></blockquote></div>
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