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<ul id="index">
  <li><a href="#NAME">NAME</a></li>
  <li><a href="#SYNOPSIS">SYNOPSIS</a></li>
  <li><a href="#DESCRIPTION">DESCRIPTION</a></li>
  <li><a href="#EXAMPLES">EXAMPLES</a></li>
  <li><a href="#SEE-ALSO">SEE ALSO</a></li>
  <li><a href="#COPYRIGHT">COPYRIGHT</a></li>
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<p>bio - Basic I/O abstraction</p>

<h1 id="SYNOPSIS">SYNOPSIS</h1>

<pre><code> #include &lt;openssl/bio.h&gt;</code></pre>

<h1 id="DESCRIPTION">DESCRIPTION</h1>

<p>A BIO is an I/O abstraction, it hides many of the underlying I/O details from an application. If an application uses a BIO for its I/O it can transparently handle SSL connections, unencrypted network connections and file I/O.</p>

<p>There are two type of BIO, a source/sink BIO and a filter BIO.</p>

<p>As its name implies a source/sink BIO is a source and/or sink of data, examples include a socket BIO and a file BIO.</p>

<p>A filter BIO takes data from one BIO and passes it through to another, or the application. The data may be left unmodified (for example a message digest BIO) or translated (for example an encryption BIO). The effect of a filter BIO may change according to the I/O operation it is performing: for example an encryption BIO will encrypt data if it is being written to and decrypt data if it is being read from.</p>

<p>BIOs can be joined together to form a chain (a single BIO is a chain with one component). A chain normally consist of one source/sink BIO and one or more filter BIOs. Data read from or written to the first BIO then traverses the chain to the end (normally a source/sink BIO).</p>

<p>Some BIOs (such as memory BIOs) can be used immediately after calling BIO_new(). Others (such as file BIOs) need some additional initialization, and frequently a utility function exists to create and initialize such BIOs.</p>

<p>If BIO_free() is called on a BIO chain it will only free one BIO resulting in a memory leak.</p>

<p>Calling BIO_free_all() on a single BIO has the same effect as calling BIO_free() on it other than the discarded return value.</p>

<p>Normally the <b>type</b> argument is supplied by a function which returns a pointer to a BIO_METHOD. There is a naming convention for such functions: a source/sink BIO is normally called BIO_s_*() and a filter BIO BIO_f_*();</p>

<h1 id="EXAMPLES">EXAMPLES</h1>

<p>Create a memory BIO:</p>

<p><a href="../man3/BIO_ctrl.html">BIO_ctrl(3)</a>, <a href="../man3/BIO_f_base64.html">BIO_f_base64(3)</a>, <a href="../man3/BIO_f_buffer.html">BIO_f_buffer(3)</a>, <a href="../man3/BIO_f_cipher.html">BIO_f_cipher(3)</a>, <a href="../man3/BIO_f_md.html">BIO_f_md(3)</a>, <a href="../man3/BIO_f_null.html">BIO_f_null(3)</a>, <a href="../man3/BIO_f_ssl.html">BIO_f_ssl(3)</a>, <a href="../man3/BIO_find_type.html">BIO_find_type(3)</a>, <a href="../man3/BIO_new.html">BIO_new(3)</a>, <a href="../man3/BIO_new_bio_pair.html">BIO_new_bio_pair(3)</a>, <a href="../man3/BIO_push.html">BIO_push(3)</a>, <a href="../man3/BIO_read_ex.html">BIO_read_ex(3)</a>, <a href="../man3/BIO_s_accept.html">BIO_s_accept(3)</a>, <a href="../man3/BIO_s_bio.html">BIO_s_bio(3)</a>, <a href="../man3/BIO_s_connect.html">BIO_s_connect(3)</a>, <a href="../man3/BIO_s_fd.html">BIO_s_fd(3)</a>, <a href="../man3/BIO_s_file.html">BIO_s_file(3)</a>, <a href="../man3/BIO_s_mem.html">BIO_s_mem(3)</a>, <a href="../man3/BIO_s_null.html">BIO_s_null(3)</a>, <a href="../man3/BIO_s_socket.html">BIO_s_socket(3)</a>, <a href="../man3/BIO_set_callback.html">BIO_set_callback(3)</a>, <a href="../man3/BIO_should_retry.html">BIO_should_retry(3)</a></p>

<h1 id="COPYRIGHT">COPYRIGHT</h1>

<p>Licensed under the OpenSSL license (the &quot;License&quot;). You may not use this file except in compliance with the License. You can obtain a copy in the file LICENSE in the source distribution or at <a href="https://www.openssl.org/source/license.html">https://www.openssl.org/source/license.html</a>.</p>

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