bio(3)                              OpenSL                             bio(3)



NAME
       bio - I/O abstraction

SYNOPSIS
        #include 

       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 SL connections, unencrypted network con-
       nections 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 mes-
       sage 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
       BIOctrl(3), BIOfbase64(3), BIOfbuffer(3), BIOfcipher(3),
       BIOfmd(3), BIOfnull(3), BIOfssl(3), BIOfindtype(3), BIOnew(3),
       BIOnewbiopair(3), BIOpush(3), BIOread(3), BIOsaccept(3),
       BIOsbio(3), BIOsconnect(3), BIOsfd(3), BIOsfile(3),
       BIOsmem(3), BIOsnull(3), BIOssocket(3), BIOsetcallback(3),
       BIOshouldretry(3)



0.9.7l                            2001-04-12                            bio(3)