bio man page on DigitalUNIX

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bio(3)									bio(3)

       bio - I/O abstraction

       #include <openssl/bio.h>

       TBA );

       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 con‐
       nections and file I/O.

       There are two types 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 will decrypt data if it is being read from.

       BIOs can be joined 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  tra‐
       verses the chain to the end (usually a source/sink BIO).

       Functions:      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)


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