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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 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 traverses the
  chain to the end (usually a source/sink BIO).


SEE ALSO

  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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