bio(3)

     bio(3)                 0.9.6h (2001-04-12)                 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)

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