02-08-2013
Hi Rudic,
Please let me know what does [M] implies.
how does it filter?
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bio(3SSL) OpenSSL bio(3SSL)
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 connections 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
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 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)
1.0.0e 2001-04-12 bio(3SSL)