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124 .\" ========================================================================
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126 .IX Title "bio 3"
127 .TH bio 3 "2007-10-24" "0.9.8g" "OpenSSL"
128 .\" For nroff, turn off justification. Always turn off hyphenation; it makes
129 .\" way too many mistakes in technical documents.
130 .if n .ad l
131 .nh
132 .SH "NAME"
133 bio \- I/O abstraction
134 .SH "SYNOPSIS"
135 .IX Header "SYNOPSIS"
136 .Vb 1
137 \& #include <openssl/bio.h>
138 .Ve
139 .PP
140 \&\s-1TBA\s0
141 .SH "DESCRIPTION"
142 .IX Header "DESCRIPTION"
143 A \s-1BIO\s0 is an I/O abstraction, it hides many of the underlying I/O
144 details from an application. If an application uses a \s-1BIO\s0 for its
145 I/O it can transparently handle \s-1SSL\s0 connections, unencrypted network
146 connections and file I/O.
147 .PP
148 There are two type of \s-1BIO\s0, a source/sink \s-1BIO\s0 and a filter \s-1BIO\s0.
149 .PP
150 As its name implies a source/sink \s-1BIO\s0 is a source and/or sink of data,
151 examples include a socket \s-1BIO\s0 and a file \s-1BIO\s0.
152 .PP
153 A filter \s-1BIO\s0 takes data from one \s-1BIO\s0 and passes it through to
154 another, or the application. The data may be left unmodified (for
155 example a message digest \s-1BIO\s0) or translated (for example an
156 encryption \s-1BIO\s0). The effect of a filter \s-1BIO\s0 may change according
157 to the I/O operation it is performing: for example an encryption
158 \&\s-1BIO\s0 will encrypt data if it is being written to and decrypt data
159 if it is being read from.
160 .PP
161 BIOs can be joined together to form a chain (a single \s-1BIO\s0 is a chain
162 with one component). A chain normally consist of one source/sink
163 \&\s-1BIO\s0 and one or more filter BIOs. Data read from or written to the
164 first \s-1BIO\s0 then traverses the chain to the end (normally a source/sink
165 \&\s-1BIO\s0).
166 .SH "SEE ALSO"
167 .IX Header "SEE ALSO"
168 \&\fIBIO_ctrl\fR\|(3),
169 \&\fIBIO_f_base64\fR\|(3), \fIBIO_f_buffer\fR\|(3),
170 \&\fIBIO_f_cipher\fR\|(3), \fIBIO_f_md\fR\|(3),
171 \&\fIBIO_f_null\fR\|(3), \fIBIO_f_ssl\fR\|(3),
172 \&\fIBIO_find_type\fR\|(3), \fIBIO_new\fR\|(3),
173 \&\fIBIO_new_bio_pair\fR\|(3),
174 \&\fIBIO_push\fR\|(3), \fIBIO_read\fR\|(3),
175 \&\fIBIO_s_accept\fR\|(3), \fIBIO_s_bio\fR\|(3),
176 \&\fIBIO_s_connect\fR\|(3), \fIBIO_s_fd\fR\|(3),
177 \&\fIBIO_s_file\fR\|(3), \fIBIO_s_mem\fR\|(3),
178 \&\fIBIO_s_null\fR\|(3), \fIBIO_s_socket\fR\|(3),
179 \&\fIBIO_set_callback\fR\|(3),
180 \&\fIBIO_should_retry\fR\|(3)