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<?xml version="1.0" ?> <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"> <head> <title>bio</title> <meta http-equiv="content-type" content="text/html; charset=utf-8" /> <link rev="made" href="mailto:root@hsxx.drive.ne.jp" /> </head> <body style="background-color: white"> <!-- INDEX BEGIN --> <div name="index"> <p><a name="__index__"></a></p> <ul> <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> </ul> <hr name="index" /> </div> <!-- INDEX END --> <p> </p> <hr /> <h1><a name="name">NAME</a></h1> <p>bio - Basic I/O abstraction</p> <p> </p> <hr /> <h1><a name="synopsis">SYNOPSIS</a></h1> <pre> #include <openssl/bio.h></pre> <p> </p> <hr /> <h1><a name="description">DESCRIPTION</a></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 <code>BIO_new()</code>. Others (such as file BIOs) need some additional initialization, and frequently a utility function exists to create and initialize such BIOs.</p> <p>If <code>BIO_free()</code> is called on a BIO chain it will only free one BIO resulting in a memory leak.</p> <p>Calling <code>BIO_free_all()</code> on a single BIO has the same effect as calling <code>BIO_free()</code> on it other than the discarded return value.</p> <p>Normally the <strong>type</strong> 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> <p> </p> <hr /> <h1><a name="examples">EXAMPLES</a></h1> <p>Create a memory BIO:</p> <pre> BIO *mem = BIO_new(BIO_s_mem());</pre> <p> </p> <hr /> <h1><a name="see_also">SEE ALSO</a></h1> <p><em>BIO_ctrl(3)</em>, <em>BIO_f_base64(3)</em>, <em>BIO_f_buffer(3)</em>, <em>BIO_f_cipher(3)</em>, <em>BIO_f_md(3)</em>, <em>BIO_f_null(3)</em>, <em>BIO_f_ssl(3)</em>, <em>BIO_find_type(3)</em>, <em>BIO_new(3)</em>, <em>BIO_new_bio_pair(3)</em>, <em>BIO_push(3)</em>, <em>BIO_read_ex(3)</em>, <em>BIO_s_accept(3)</em>, <em>BIO_s_bio(3)</em>, <em>BIO_s_connect(3)</em>, <em>BIO_s_fd(3)</em>, <em>BIO_s_file(3)</em>, <em>BIO_s_mem(3)</em>, <em>BIO_s_null(3)</em>, <em>BIO_s_socket(3)</em>, <em>BIO_set_callback(3)</em>, <em>BIO_should_retry(3)</em></p> <p> </p> <hr /> <h1><a name="copyright">COPYRIGHT</a></h1> <p>Copyright 2000-2019 The OpenSSL Project Authors. All Rights Reserved.</p> <p>Licensed under the OpenSSL license (the "License"). 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> </body> </html>