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bio_f_null(3) [opendarwin man page]

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 0.9.7d 2002-04-30 BIO_f_null(3)

Check Out this Related Man Page

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 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) 0.9.7a 2001-04-12 bio(3)
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