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.\" Automatically generated by Pod::Man 4.11 (Pod::Simple 3.35) .\" .\" Standard preamble: .\" ======================================================================== .de Sp \" Vertical space (when we can't use .PP) .if t .sp .5v .if n .sp .. .de Vb \" Begin verbatim text .ft CW .nf .ne \\$1 .. .de Ve \" End verbatim text .ft R .fi .. .\" Set up some character translations and predefined strings. \(-- will .\" give an unbreakable dash, \(PI will give pi, \(L" will give a left .\" double quote, and \(R" will give a right double quote. \(C+ will .\" give a nicer C++. Capital omega is used to do unbreakable dashes and .\" therefore won't be available. \(C` and \(C' expand to `' in nroff, .\" nothing in troff, for use with C<>. .tr \(W- .ds C+ C\v'-.1v'\h'-1p'\s-2+\h'-1p'+\s0\v'.1v'\h'-1p' .ie n \{\ . ds -- \(W- . ds PI pi . if (\n(.H=4u)&(1m=24u) .ds -- \(W\h'-12u'\(W\h'-12u'-\" diablo 10 pitch . if (\n(.H=4u)&(1m=20u) .ds -- \(W\h'-12u'\(W\h'-8u'-\" diablo 12 pitch . ds L" "" . ds R" "" . ds C` "" . ds C' "" 'br\} .el\{\ . ds -- \\|\(em\\| . ds PI \(p . ds L" `` . ds R" '' . ds C` . ds C' 'br\} .\" .\" Escape single quotes in literal strings from groff's Unicode transform. .ie \n(.g .ds Aq \(aq .el .ds Aq ' .\" .\" If the F register is >0, we'll generate index entries on stderr for .\" titles (.TH), headers (.SH), subsections (.SS), items (.Ip), and index .\" entries marked with X<> in POD. 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No user-serviceable parts. . \" fudge factors for nroff and troff .if n \{\ . ds #H 0 . ds #V .8m . ds #F .3m . ds #[ \f1 . ds #] \fP .\} .if t \{\ . ds #H ((1u-(\\\\n(.fu%2u)).13m) . ds #V .6m . ds #F 0 . ds #[ \& . ds #] \& .\} . \" simple accents for nroff and troff .if n \{\ . ds ' \& . ds ` \& . ds ^ \& . ds , \& . ds ~ ~ . ds / .\} .if t \{\ . ds ' \\k:\h'-(\\n(.wu8/10-\(#H)'\'\h"\|\\n:u" . ds ` \\k:\h'-(\\n(.wu8/10-\(#H)'\`\h'\|\\n:u' . ds ^ \\k:\h'-(\\n(.wu10/11-\(#H)'^\h'\|\\n:u' . ds , \\k:\h'-(\\n(.wu8/10)',\h'\|\\n:u' . ds ~ \\k:\h'-(\\n(.wu-\(#H-.1m)'~\h'\|\\n:u' . ds / \\k:\h'-(\\n(.wu8/10-\(#H)'\z\(sl\h'\|\\n:u' .\} . \" troff and (daisy-wheel) nroff accents .ds : \\k:\h'-(\\n(.wu8/10-\(#H+.1m+\(#F)'\v'-\(#V'\z.\h'.2m+\(#F'.\h'\|\\n:u'\v'\(#V' .ds 8 \h'\(#H'\(b\h'-\(#H' .ds o \\k:\h'-(\\n(.wu+\w'\(de'u-\(#H)/2u'\v'-.3n'\(#[\z\(de\v'.3n'\h'\|\\n:u'\(#] .ds d- \h'\(#H'\(pd\h'-\w'~'u'\v'-.25m'\f2\(hy\fP\v'.25m'\h'-\(#H' .ds D- D\\k:\h'-\w'D'u'\v'-.11m'\z\(hy\v'.11m'\h'\|\\n:u' .ds th \(#[\v'.3m'\s+1I\s-1\v'-.3m'\h'-(\w'I'u2/3)'\s-1o\s+1\(#] .ds Th \(#[\s+2I\s-2\h'-\w'I'u3/5'\v'-.3m'o\v'.3m'\(#] .ds ae a\h'-(\w'a'u4/10)'e .ds Ae A\h'-(\w'A'u4/10)'E . \" corrections for vroff .if v .ds ~ \\k:\h'-(\\n(.wu9/10-\(#H)'\s-2\u~\d\s+2\h'\|\\n:u' .if v .ds ^ \\k:\h'-(\\n(.wu10/11-\(#H)'\v'-.4m'^\v'.4m'\h'\|\\n:u' . \" for low resolution devices (crt and lpr) .if \n(.H>23 .if \n(.V>19 \ \{\ . ds : e . ds 8 ss . ds o a . ds d- d\h'-1'\(ga . ds D- D\h'-1'\(hy . ds th \o'bp' . ds Th \o'LP' . ds ae ae . ds Ae AE .\} .rm #[ #] #H #V #F C .\" ======================================================================== .\" .IX Title "BIO 7" .TH BIO 7 "2023-09-11" "1.1.1w" "OpenSSL" .\" For nroff, turn off justification. Always turn off hyphenation; it makes .\" way too many mistakes in technical documents. .if n .ad l .nh .SH "NAME" bio \- Basic I/O abstraction .SH "SYNOPSIS" .IX Header "SYNOPSIS" .Vb 1 \& #include <openssl/bio.h> .Ve .SH "DESCRIPTION" .IX Header "DESCRIPTION" A \s-1BIO\s0 is an I/O abstraction, it hides many of the underlying I/O details from an application. If an application uses a \s-1BIO\s0 for its I/O it can transparently handle \s-1SSL\s0 connections, unencrypted network connections and file I/O. .PP There are two type of \s-1BIO,\s0 a source/sink \s-1BIO\s0 and a filter \s-1BIO.\s0 .PP As its name implies a source/sink \s-1BIO\s0 is a source and/or sink of data, examples include a socket \s-1BIO\s0 and a file \s-1BIO.\s0 .PP A filter \s-1BIO\s0 takes data from one \s-1BIO\s0 and passes it through to another, or the application. The data may be left unmodified (for example a message digest \s-1BIO\s0) or translated (for example an encryption \s-1BIO\s0). The effect of a filter \s-1BIO\s0 may change according to the I/O operation it is performing: for example an encryption \&\s-1BIO\s0 will encrypt data if it is being written to and decrypt data if it is being read from. .PP BIOs can be joined together to form a chain (a single \s-1BIO\s0 is a chain with one component). A chain normally consist of one source/sink \&\s-1BIO\s0 and one or more filter BIOs. Data read from or written to the first \s-1BIO\s0 then traverses the chain to the end (normally a source/sink \&\s-1BIO\s0). .PP Some BIOs (such as memory BIOs) can be used immediately after calling \&\fBBIO_new()\fR. Others (such as file BIOs) need some additional initialization, and frequently a utility function exists to create and initialize such BIOs. .PP If \fBBIO_free()\fR is called on a \s-1BIO\s0 chain it will only free one \s-1BIO\s0 resulting in a memory leak. .PP Calling \fBBIO_free_all()\fR on a single \s-1BIO\s0 has the same effect as calling \&\fBBIO_free()\fR on it other than the discarded return value. .PP Normally the \fBtype\fR argument is supplied by a function which returns a pointer to a \s-1BIO_METHOD.\s0 There is a naming convention for such functions: a source/sink \s-1BIO\s0 is normally called BIO_s_() and a filter \s-1BIO\s0 BIO_f_(); .SH "EXAMPLES" .IX Header "EXAMPLES" Create a memory \s-1BIO:\s0 .PP .Vb 1 \& BIO mem = BIO_new(BIO_s_mem()); .Ve .SH "SEE ALSO" .IX Header "SEE ALSO" \&\fBBIO_ctrl\fR\\|(3), \&\fBBIO_f_base64\fR\\|(3), \fBBIO_f_buffer\fR\\|(3), \&\fBBIO_f_cipher\fR\\|(3), \fBBIO_f_md\fR\\|(3), \&\fBBIO_f_null\fR\\|(3), \fBBIO_f_ssl\fR\\|(3), \&\fBBIO_find_type\fR\\|(3), \fBBIO_new\fR\\|(3), \&\fBBIO_new_bio_pair\fR\\|(3), \&\fBBIO_push\fR\\|(3), \fBBIO_read_ex\fR\\|(3), \&\fBBIO_s_accept\fR\\|(3), \fBBIO_s_bio\fR\\|(3), \&\fBBIO_s_connect\fR\\|(3), \fBBIO_s_fd\fR\\|(3), \&\fBBIO_s_file\fR\\|(3), \fBBIO_s_mem\fR\\|(3), \&\fBBIO_s_null\fR\\|(3), \fBBIO_s_socket\fR\\|(3), \&\fBBIO_set_callback\fR\\|(3), \&\fBBIO_should_retry\fR\\|(3) .SH "COPYRIGHT" .IX Header "COPYRIGHT" Copyright 2000\-2019 The OpenSSL Project Authors. All Rights Reserved. .PP Licensed under the OpenSSL license (the \(L"License\(R"). You may not use this file except in compliance with the License. You can obtain a copy in the file \s-1LICENSE\s0 in the source distribution or at <https://www.openssl.org/source/license.html>.

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