1bio(3)                              OpenSSL                             bio(3)
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NAME

6       bio - I/O abstraction
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SYNOPSIS

9        #include <openssl/bio.h>
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11       TBA
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DESCRIPTION

14       A BIO is an I/O abstraction, it hides many of the underlying I/O
15       details from an application. If an application uses a BIO for its I/O
16       it can transparently handle SSL connections, unencrypted network
17       connections and file I/O.
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19       There are two type of BIO, a source/sink BIO and a filter BIO.
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21       As its name implies a source/sink BIO is a source and/or sink of data,
22       examples include a socket BIO and a file BIO.
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24       A filter BIO takes data from one BIO and passes it through to another,
25       or the application. The data may be left unmodified (for example a
26       message digest BIO) or translated (for example an encryption BIO). The
27       effect of a filter BIO may change according to the I/O operation it is
28       performing: for example an encryption BIO will encrypt data if it is
29       being written to and decrypt data if it is being read from.
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31       BIOs can be joined together to form a chain (a single BIO is a chain
32       with one component). A chain normally consist of one source/sink BIO
33       and one or more filter BIOs. Data read from or written to the first BIO
34       then traverses the chain to the end (normally a source/sink BIO).
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SEE ALSO

37       BIO_ctrl(3), BIO_f_base64(3), BIO_f_buffer(3), BIO_f_cipher(3),
38       BIO_f_md(3), BIO_f_null(3), BIO_f_ssl(3), BIO_find_type(3), BIO_new(3),
39       BIO_new_bio_pair(3), BIO_push(3), BIO_read(3), BIO_s_accept(3),
40       BIO_s_bio(3), BIO_s_connect(3), BIO_s_fd(3), BIO_s_file(3),
41       BIO_s_mem(3), BIO_s_null(3), BIO_s_socket(3), BIO_set_callback(3),
42       BIO_should_retry(3)
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461.0.0e                            2001-04-12                            bio(3)