2000-09-07 08:22:31 +08:00
|
|
|
=pod
|
|
|
|
|
|
|
|
|
|
=head1 NAME
|
|
|
|
|
|
|
|
|
|
bio - I/O abstraction
|
|
|
|
|
|
|
|
|
|
=head1 SYNOPSIS
|
|
|
|
|
|
|
|
|
|
#include <openssl/bio.h>
|
|
|
|
|
|
|
|
|
|
TBA
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
=head1 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
|
|
|
|
|
connections and file I/O.
|
|
|
|
|
|
|
|
|
|
There are two type of BIO, a source/sink BIO and a filter BIO.
|
|
|
|
|
|
2000-09-07 16:07:55 +08:00
|
|
|
As its name implies a source/sink BIO is a source and/or sink of data,
|
2000-09-07 08:22:31 +08:00
|
|
|
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 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.
|
|
|
|
|
|
|
|
|
|
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
|
2000-09-11 01:36:15 +08:00
|
|
|
first BIO then traverses the chain to the end (normally a source/sink
|
2000-09-07 08:22:31 +08:00
|
|
|
BIO).
|
|
|
|
|
|
|
|
|
|
=head1 SEE ALSO
|
|
|
|
|
|
2015-08-18 03:21:33 +08:00
|
|
|
L<BIO_ctrl(3)>,
|
|
|
|
|
L<BIO_f_base64(3)>, L<BIO_f_buffer(3)>,
|
|
|
|
|
L<BIO_f_cipher(3)>, L<BIO_f_md(3)>,
|
|
|
|
|
L<BIO_f_null(3)>, L<BIO_f_ssl(3)>,
|
|
|
|
|
L<BIO_find_type(3)>, L<BIO_new(3)>,
|
|
|
|
|
L<BIO_new_bio_pair(3)>,
|
|
|
|
|
L<BIO_push(3)>, L<BIO_read(3)>,
|
|
|
|
|
L<BIO_s_accept(3)>, L<BIO_s_bio(3)>,
|
|
|
|
|
L<BIO_s_connect(3)>, L<BIO_s_fd(3)>,
|
|
|
|
|
L<BIO_s_file(3)>, L<BIO_s_mem(3)>,
|
|
|
|
|
L<BIO_s_mem(3)>,
|
|
|
|
|
L<BIO_s_null(3)>, L<BIO_s_socket(3)>,
|
|
|
|
|
L<BIO_set_callback(3)>,
|
|
|
|
|
L<BIO_should_retry(3)>
|
