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+.\" ========================================================================
+.\"
+.IX Title "bio 3"
+.TH bio 3 "2014-06-05" "0.9.8za" "OpenSSL"
+.\" For nroff, turn off justification.  Always turn off hyphenation; it makes
+.\" way too many mistakes in technical documents.
+.if n .ad l
+.nh
+.SH "NAME"
+bio \- I/O abstraction
+.SH "SYNOPSIS"
+.IX Header "SYNOPSIS"
+.Vb 1
+\& #include <openssl/bio.h>
+.Ve
+.PP
+\&\s-1TBA\s0
+.SH "DESCRIPTION"
+.IX Header "DESCRIPTION"
+A \s-1BIO\s0 is an I/O abstraction, it hides many of the underlying I/O
+details from an application. If an application uses a \s-1BIO\s0 for its
+I/O it can transparently handle \s-1SSL\s0 connections, unencrypted network
+connections and file I/O.
+.PP
+There are two type of \s-1BIO,\s0 a source/sink \s-1BIO\s0 and a filter \s-1BIO.\s0
+.PP
+As its name implies a source/sink \s-1BIO\s0 is a source and/or sink of data,
+examples include a socket \s-1BIO\s0 and a file \s-1BIO.\s0
+.PP
+A filter \s-1BIO\s0 takes data from one \s-1BIO\s0 and passes it through to
+another, or the application. The data may be left unmodified (for
+example a message digest \s-1BIO\s0) or translated (for example an
+encryption \s-1BIO\s0). The effect of a filter \s-1BIO\s0 may change according
+to the I/O operation it is performing: for example an encryption
+\&\s-1BIO\s0 will encrypt data if it is being written to and decrypt data
+if it is being read from.
+.PP
+BIOs can be joined together to form a chain (a single \s-1BIO\s0 is a chain
+with one component). A chain normally consist of one source/sink
+\&\s-1BIO\s0 and one or more filter BIOs. Data read from or written to the
+first \s-1BIO\s0 then traverses the chain to the end (normally a source/sink
+\&\s-1BIO\s0).
+.SH "SEE ALSO"
+.IX Header "SEE ALSO"
+\&\fIBIO_ctrl\fR\|(3),
+\&\fIBIO_f_base64\fR\|(3), \fIBIO_f_buffer\fR\|(3),
+\&\fIBIO_f_cipher\fR\|(3), \fIBIO_f_md\fR\|(3),
+\&\fIBIO_f_null\fR\|(3), \fIBIO_f_ssl\fR\|(3),
+\&\fIBIO_find_type\fR\|(3), \fIBIO_new\fR\|(3),
+\&\fIBIO_new_bio_pair\fR\|(3),
+\&\fIBIO_push\fR\|(3), \fIBIO_read\fR\|(3),
+\&\fIBIO_s_accept\fR\|(3), \fIBIO_s_bio\fR\|(3),
+\&\fIBIO_s_connect\fR\|(3), \fIBIO_s_fd\fR\|(3),
+\&\fIBIO_s_file\fR\|(3), \fIBIO_s_mem\fR\|(3),
+\&\fIBIO_s_null\fR\|(3), \fIBIO_s_socket\fR\|(3),
+\&\fIBIO_set_callback\fR\|(3),
+\&\fIBIO_should_retry\fR\|(3)