209 lines
6.8 KiB
Groff
209 lines
6.8 KiB
Groff
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.\" ========================================================================
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.\"
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.IX Title "BIO 7"
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.TH BIO 7 "2020-03-02" "3.0.0-dev" "OpenSSL"
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.\" For nroff, turn off justification. Always turn off hyphenation; it makes
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.\" way too many mistakes in technical documents.
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.if n .ad l
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.nh
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.SH "NAME"
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bio \- Basic 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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.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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.PP
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Some BIOs (such as memory BIOs) can be used immediately after calling
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\&\fIBIO_new()\fR. Others (such as file BIOs) need some additional initialization,
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and frequently a utility function exists to create and initialize such BIOs.
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.PP
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If \fIBIO_free()\fR is called on a \s-1BIO\s0 chain it will only free one \s-1BIO\s0 resulting
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in a memory leak.
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.PP
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Calling \fIBIO_free_all()\fR on a single \s-1BIO\s0 has the same effect as calling
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\&\fIBIO_free()\fR on it other than the discarded return value.
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.PP
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Normally the \fItype\fR argument is supplied by a function which returns a
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pointer to a \s-1BIO_METHOD\s0. There is a naming convention for such functions:
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a source/sink \s-1BIO\s0 typically starts with \fIBIO_s_\fR and
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a filter \s-1BIO\s0 with \fIBIO_f_\fR.
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.SH "EXAMPLES"
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.IX Header "EXAMPLES"
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Create a memory \s-1BIO:\s0
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.PP
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.Vb 1
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\& BIO *mem = BIO_new(BIO_s_mem());
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.Ve
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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_ex\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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.SH "COPYRIGHT"
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.IX Header "COPYRIGHT"
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Copyright 2000\-2017 The OpenSSL Project Authors. All Rights Reserved.
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.PP
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Licensed under the Apache License 2.0 (the \*(L"License\*(R"). You may not use
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this file except in compliance with the License. You can obtain a copy
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in the file \s-1LICENSE\s0 in the source distribution or at
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<https://www.openssl.org/source/license.html>.
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