bio(3)				    OpenSSL				bio(3)

NAME
       bio - I/O abstraction

SYNOPSIS
	#include <openssl/bio.h>

       TBA

DESCRIPTION
       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 con‐
       nections and file I/O.

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

       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.

       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 mes‐
       sage 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.

       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).

SEE ALSO
       BIO_ctrl(3), BIO_f_base64(3), BIO_f_buffer(3), BIO_f_cipher(3),
       BIO_f_md(3), BIO_f_null(3), BIO_f_ssl(3), BIO_find_type(3), BIO_new(3),
       BIO_new_bio_pair(3), BIO_push(3), BIO_read(3), BIO_s_accept(3),
       BIO_s_bio(3), BIO_s_connect(3), BIO_s_fd(3), BIO_s_file(3),
       BIO_s_mem(3), BIO_s_null(3), BIO_s_socket(3), BIO_set_callback(3),
       BIO_should_retry(3)

0.9.8k				  2009-05-20				bio(3)

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