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136 .TH bio 3 "2015-07-09" "1.0.1p" "OpenSSL"
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142 bio \- I/O abstraction
144 .IX Header "SYNOPSIS"
146 \& #include <openssl/bio.h>
151 .IX Header "DESCRIPTION"
152 A \s-1BIO\s0 is an I/O abstraction, it hides many of the underlying I/O
153 details from an application. If an application uses a \s-1BIO\s0 for its
154 I/O it can transparently handle \s-1SSL\s0 connections, unencrypted network
155 connections and file I/O.
157 There are two type of \s-1BIO,\s0 a source/sink \s-1BIO\s0 and a filter \s-1BIO.\s0
159 As its name implies a source/sink \s-1BIO\s0 is a source and/or sink of data,
160 examples include a socket \s-1BIO\s0 and a file \s-1BIO.\s0
162 A filter \s-1BIO\s0 takes data from one \s-1BIO\s0 and passes it through to
163 another, or the application. The data may be left unmodified (for
164 example a message digest \s-1BIO\s0) or translated (for example an
165 encryption \s-1BIO\s0). The effect of a filter \s-1BIO\s0 may change according
166 to the I/O operation it is performing: for example an encryption
167 \&\s-1BIO\s0 will encrypt data if it is being written to and decrypt data
168 if it is being read from.
170 BIOs can be joined together to form a chain (a single \s-1BIO\s0 is a chain
171 with one component). A chain normally consist of one source/sink
172 \&\s-1BIO\s0 and one or more filter BIOs. Data read from or written to the
173 first \s-1BIO\s0 then traverses the chain to the end (normally a source/sink
176 .IX Header "SEE ALSO"
177 \&\fIBIO_ctrl\fR\|(3),
178 \&\fIBIO_f_base64\fR\|(3), \fIBIO_f_buffer\fR\|(3),
179 \&\fIBIO_f_cipher\fR\|(3), \fIBIO_f_md\fR\|(3),
180 \&\fIBIO_f_null\fR\|(3), \fIBIO_f_ssl\fR\|(3),
181 \&\fIBIO_find_type\fR\|(3), \fIBIO_new\fR\|(3),
182 \&\fIBIO_new_bio_pair\fR\|(3),
183 \&\fIBIO_push\fR\|(3), \fIBIO_read\fR\|(3),
184 \&\fIBIO_s_accept\fR\|(3), \fIBIO_s_bio\fR\|(3),
185 \&\fIBIO_s_connect\fR\|(3), \fIBIO_s_fd\fR\|(3),
186 \&\fIBIO_s_file\fR\|(3), \fIBIO_s_mem\fR\|(3),
187 \&\fIBIO_s_null\fR\|(3), \fIBIO_s_socket\fR\|(3),
188 \&\fIBIO_set_callback\fR\|(3),
189 \&\fIBIO_should_retry\fR\|(3)