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<a name="setbuffer_002d_002d_002dspecify-full-buffering-for-a-file-or-stream-with-size"></a>
<h3 class="section">4.56 <code>setbuffer</code>—specify full buffering for a file or stream with size</h3>
<a name="index-setbuffer"></a>
<p><strong>Synopsis</strong>
</p><div class="example">
<pre class="example">#include <stdio.h>
void setbuffer(FILE *<var>fp</var>, char *<var>buf</var>, int <var>size</var>);
</pre></div>
<p><strong>Description</strong><br>
<code>setbuffer</code> specifies that output to the file or stream identified by
<var>fp</var> should be fully buffered. All output for this file will go to a
buffer (of size <var>size</var>). Output will be passed on to the host system
only when the buffer is full, or when an input operation intervenes.
</p>
<p>You may, if you wish, supply your own buffer by passing a pointer to
it as the argument <var>buf</var>. It must have size <var>size</var>. You can
also use <code>NULL</code> as the value of <var>buf</var>, to signal that the
<code>setbuffer</code> function is to allocate the buffer.
</p>
<br>
<p><strong>Warnings</strong><br>
You may only use <code>setbuffer</code> before performing any file operation
other than opening the file.
</p>
<p>If you supply a non-null <var>buf</var>, you must ensure that the associated
storage continues to be available until you close the stream
identified by <var>fp</var>.
</p>
<br>
<p><strong>Returns</strong><br>
<code>setbuffer</code> does not return a result.
</p>
<br>
<p><strong>Portability</strong><br>
This function comes from BSD not ANSI or POSIX.
</p>
<p>Supporting OS subroutines required: <code>close</code>, <code>fstat</code>, <code>isatty</code>,
<code>lseek</code>, <code>read</code>, <code>sbrk</code>, <code>write</code>.
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