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.\" ========================================================================
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.\"
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2002-07-30 14:34:51 +00:00
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.IX Title "bio 3"
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.TH bio 3 "2005-02-24" "0.9.7d" "OpenSSL"
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.SH "NAME"
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bio \- I/O abstraction
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.SH "SYNOPSIS"
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.IX Header "SYNOPSIS"
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.Vb 1
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\& #include <openssl/bio.h>
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.Ve
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.PP
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\&\s-1TBA\s0
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.SH "DESCRIPTION"
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.IX Header "DESCRIPTION"
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A \s-1BIO\s0 is an I/O abstraction, it hides many of the underlying I/O
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details from an application. If an application uses a \s-1BIO\s0 for its
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I/O it can transparently handle \s-1SSL\s0 connections, unencrypted network
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connections and file I/O.
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.PP
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There are two type of \s-1BIO\s0, a source/sink \s-1BIO\s0 and a filter \s-1BIO\s0.
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.PP
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As its name implies a source/sink \s-1BIO\s0 is a source and/or sink of data,
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examples include a socket \s-1BIO\s0 and a file \s-1BIO\s0.
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.PP
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A filter \s-1BIO\s0 takes data from one \s-1BIO\s0 and passes it through to
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another, or the application. The data may be left unmodified (for
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example a message digest \s-1BIO\s0) or translated (for example an
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encryption \s-1BIO\s0). The effect of a filter \s-1BIO\s0 may change according
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to the I/O operation it is performing: for example an encryption
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\&\s-1BIO\s0 will encrypt data if it is being written to and decrypt data
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if it is being read from.
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.PP
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BIOs can be joined together to form a chain (a single \s-1BIO\s0 is a chain
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with one component). A chain normally consist of one source/sink
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\&\s-1BIO\s0 and one or more filter BIOs. Data read from or written to the
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first \s-1BIO\s0 then traverses the chain to the end (normally a source/sink
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\&\s-1BIO\s0).
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.SH "SEE ALSO"
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.IX Header "SEE ALSO"
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\&\fIBIO_ctrl\fR\|(3),
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\&\fIBIO_f_base64\fR\|(3), \fIBIO_f_buffer\fR\|(3),
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\&\fIBIO_f_cipher\fR\|(3), \fIBIO_f_md\fR\|(3),
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\&\fIBIO_f_null\fR\|(3), \fIBIO_f_ssl\fR\|(3),
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\&\fIBIO_find_type\fR\|(3), \fIBIO_new\fR\|(3),
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\&\fIBIO_new_bio_pair\fR\|(3),
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\&\fIBIO_push\fR\|(3), \fIBIO_read\fR\|(3),
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\&\fIBIO_s_accept\fR\|(3), \fIBIO_s_bio\fR\|(3),
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\&\fIBIO_s_connect\fR\|(3), \fIBIO_s_fd\fR\|(3),
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\&\fIBIO_s_file\fR\|(3), \fIBIO_s_mem\fR\|(3),
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\&\fIBIO_s_null\fR\|(3), \fIBIO_s_socket\fR\|(3),
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\&\fIBIO_set_callback\fR\|(3),
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\&\fIBIO_should_retry\fR\|(3)
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