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-.\"	$OpenBSD: BIO.3,v 1.5 2016/11/22 14:55:19 schwarze Exp $
-.\"	OpenSSL a9c85cea Nov 11 09:33:55 2016 +0100
-.\"
-.\" This file was written by Dr. Stephen Henson <steve@openssl.org>.
-.\" Copyright (c) 2000 The OpenSSL Project.  All rights reserved.
-.\"
-.\" Redistribution and use in source and binary forms, with or without
-.\" modification, are permitted provided that the following conditions
-.\" are met:
-.\"
-.\" 1. Redistributions of source code must retain the above copyright
-.\"    notice, this list of conditions and the following disclaimer.
-.\"
-.\" 2. Redistributions in binary form must reproduce the above copyright
-.\"    notice, this list of conditions and the following disclaimer in
-.\"    the documentation and/or other materials provided with the
-.\"    distribution.
-.\"
-.\" 3. All advertising materials mentioning features or use of this
-.\"    software must display the following acknowledgment:
-.\"    "This product includes software developed by the OpenSSL Project
-.\"    for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
-.\"
-.\" 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
-.\"    endorse or promote products derived from this software without
-.\"    prior written permission. For written permission, please contact
-.\"    openssl-core@openssl.org.
-.\"
-.\" 5. Products derived from this software may not be called "OpenSSL"
-.\"    nor may "OpenSSL" appear in their names without prior written
-.\"    permission of the OpenSSL Project.
-.\"
-.\" 6. Redistributions of any form whatsoever must retain the following
-.\"    acknowledgment:
-.\"    "This product includes software developed by the OpenSSL Project
-.\"    for use in the OpenSSL Toolkit (http://www.openssl.org/)"
-.\"
-.\" THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
-.\" EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
-.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
-.\" PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
-.\" ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-.\" SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
-.\" NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
-.\" LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
-.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
-.\" STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
-.\" ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
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-.\"
-.Dd $Mdocdate: November 22 2016 $
-.Dt BIO 3
-.Os
-.Sh NAME
-.Nm BIO
-.Nd OpenSSL basic I/O abstraction
-.Sh SYNOPSIS
-.In openssl/bio.h
-.Sh DESCRIPTION
-A BIO is an I/O abstraction,
-hiding 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.
-.Pp
-There are two types of BIO, a source/sink BIO and a filter BIO.
-.Pp
-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.
-.Pp
-A filter BIO takes data from one BIO and passes it through
-to another, or to 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.
-.Pp
-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).
-.Sh SEE ALSO
-.Xr BIO_ctrl 3 ,
-.Xr BIO_f_base64 3 ,
-.Xr BIO_f_buffer 3 ,
-.Xr BIO_f_cipher 3 ,
-.Xr BIO_f_md 3 ,
-.Xr BIO_f_null 3 ,
-.Xr BIO_f_ssl 3 ,
-.Xr BIO_find_type 3 ,
-.Xr BIO_new 3 ,
-.Xr BIO_push 3 ,
-.Xr BIO_read 3 ,
-.Xr BIO_s_accept 3 ,
-.Xr BIO_s_bio 3 ,
-.Xr BIO_s_connect 3 ,
-.Xr BIO_s_fd 3 ,
-.Xr BIO_s_file 3 ,
-.Xr BIO_s_mem 3 ,
-.Xr BIO_s_null 3 ,
-.Xr BIO_s_socket 3 ,
-.Xr BIO_set_callback 3 ,
-.Xr BIO_should_retry 3