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138 .TH bio 3 "2009-07-19" "1.0.1n" "OpenSSL"
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144 bio \- I/O abstraction
148 .IX Header "SYNOPSIS"
150 \& #include <openssl/bio.h>
155 .IX Header "DESCRIPTION"
156 A \s-1BIO\s0 is an I/O abstraction, it hides many of the underlying I/O
157 details from an application. If an application uses a \s-1BIO\s0 for its
158 I/O it can transparently handle \s-1SSL\s0 connections, unencrypted network
159 connections and file I/O.
161 There are two type of \s-1BIO,\s0 a source/sink \s-1BIO\s0 and a filter \s-1BIO.\s0
163 As its name implies a source/sink \s-1BIO\s0 is a source and/or sink of data,
164 examples include a socket \s-1BIO\s0 and a file \s-1BIO.\s0
166 A filter \s-1BIO\s0 takes data from one \s-1BIO\s0 and passes it through to
167 another, or the application. The data may be left unmodified (for
168 example a message digest \s-1BIO\s0) or translated (for example an
169 encryption \s-1BIO\s0). The effect of a filter \s-1BIO\s0 may change according
170 to the I/O operation it is performing: for example an encryption
171 \&\s-1BIO\s0 will encrypt data if it is being written to and decrypt data
172 if it is being read from.
174 BIOs can be joined together to form a chain (a single \s-1BIO\s0 is a chain
175 with one component). A chain normally consist of one source/sink
176 \&\s-1BIO\s0 and one or more filter BIOs. Data read from or written to the
177 first \s-1BIO\s0 then traverses the chain to the end (normally a source/sink
180 .IX Header "SEE ALSO"
181 \&\fIBIO_ctrl\fR\|(3),
182 \&\fIBIO_f_base64\fR\|(3), \fIBIO_f_buffer\fR\|(3),
183 \&\fIBIO_f_cipher\fR\|(3), \fIBIO_f_md\fR\|(3),
184 \&\fIBIO_f_null\fR\|(3), \fIBIO_f_ssl\fR\|(3),
185 \&\fIBIO_find_type\fR\|(3), \fIBIO_new\fR\|(3),
186 \&\fIBIO_new_bio_pair\fR\|(3),
187 \&\fIBIO_push\fR\|(3), \fIBIO_read\fR\|(3),
188 \&\fIBIO_s_accept\fR\|(3), \fIBIO_s_bio\fR\|(3),
189 \&\fIBIO_s_connect\fR\|(3), \fIBIO_s_fd\fR\|(3),
190 \&\fIBIO_s_file\fR\|(3), \fIBIO_s_mem\fR\|(3),
191 \&\fIBIO_s_null\fR\|(3), \fIBIO_s_socket\fR\|(3),
192 \&\fIBIO_set_callback\fR\|(3),
193 \&\fIBIO_should_retry\fR\|(3)