195 lines
5.6 KiB
Groff
195 lines
5.6 KiB
Groff
.\" $NetBSD: openssl_bio.3,v 1.1 2001/04/12 10:45:46 itojun Exp $
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.\" Thu Apr 12 19:27:08 2001
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.\" ======================================================================
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.\"
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.IX Title "bio 3"
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.TH bio 3 "0.9.6a" "2001-04-12" "OpenSSL"
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.UC
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.SH "NAME"
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bio \- I/O abstraction
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.SH "LIBRARY"
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libcrypto, -lcrypto
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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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\&\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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BIO_ctrl(3),
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BIO_f_base64(3),
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BIO_f_cipher(3), BIO_f_md(3),
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BIO_f_null(3), BIO_f_ssl(3),
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BIO_find_type(3), BIO_new(3),
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BIO_new_bio_pair(3),
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BIO_push(3), BIO_read(3),
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BIO_s_accept(3), BIO_s_bio(3),
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BIO_s_connect(3), BIO_s_fd(3),
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BIO_s_file(3), BIO_s_mem(3),
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BIO_s_null(3), BIO_s_socket(3),
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BIO_set_callback(3),
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BIO_should_retry(3)
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