BIO_f_null(3) OpenSSL BIO_f_null(3)NAME
BIO_f_null - null filter
SYNOPSIS
#include <openssl/bio.h>
BIO_METHOD * BIO_f_null(void);
DESCRIPTION
BIO_f_null() returns the null filter BIO method. This is a filter BIO that does nothing.
All requests to a null filter BIO are passed through to the next BIO in the chain: this means that a BIO chain containing a null filter BIO
behaves just as though the BIO was not there.
NOTES
As may be apparent a null filter BIO is not particularly useful.
RETURN VALUES
BIO_f_null() returns the null filter BIO method.
SEE ALSO
TBA
0.9.7a 2000-09-14 BIO_f_null(3)
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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)
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