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+.\" -*- mode: troff; coding: utf-8 -*-
+.\" Automatically generated by Pod::Man 5.0102 (Pod::Simple 3.45)
+.\"
+.\" 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
+..
+.\" \*(C` and \*(C' are quotes in nroff, nothing in troff, for use with C<>.
+.ie n \{\
+.    ds C` ""
+.    ds C' ""
+'br\}
+.el\{\
+.    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.  Of course, you'll have to process the
+.\" output yourself in some meaningful fashion.
+.\"
+.\" Avoid warning from groff about undefined register 'F'.
+.de IX
+..
+.nr rF 0
+.if \n(.g .if rF .nr rF 1
+.if (\n(rF:(\n(.g==0)) \{\
+.    if \nF \{\
+.        de IX
+.        tm Index:\\$1\t\\n%\t"\\$2"
+..
+.        if !\nF==2 \{\
+.            nr % 0
+.            nr F 2
+.        \}
+.    \}
+.\}
+.rr rF
+.\" ========================================================================
+.\"
+.IX Title "SSL_SET_BIO 3ossl"
+.TH SSL_SET_BIO 3ossl 2025-09-16 3.5.3 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
+SSL_set_bio, SSL_set0_rbio, SSL_set0_wbio \- connect the SSL object with a BIO
+.SH SYNOPSIS
+.IX Header "SYNOPSIS"
+.Vb 1
+\& #include <openssl/ssl.h>
+\&
+\& void SSL_set_bio(SSL *ssl, BIO *rbio, BIO *wbio);
+\& void SSL_set0_rbio(SSL *s, BIO *rbio);
+\& void SSL_set0_wbio(SSL *s, BIO *wbio);
+.Ve
+.SH DESCRIPTION
+.IX Header "DESCRIPTION"
+\&\fBSSL_set0_rbio()\fR connects the BIO \fBrbio\fR for the read operations of the \fBssl\fR
+object. The SSL engine inherits the behaviour of \fBrbio\fR. If the BIO is
+nonblocking then the \fBssl\fR object will also have nonblocking behaviour. This
+function transfers ownership of \fBrbio\fR to \fBssl\fR. It will be automatically
+freed using \fBBIO_free_all\fR\|(3) when the \fBssl\fR is freed. On calling this
+function, any existing \fBrbio\fR that was previously set will also be freed via a
+call to \fBBIO_free_all\fR\|(3) (this includes the case where the \fBrbio\fR is set to
+the same value as previously).
+.PP
+If using a custom BIO, \fBrbio\fR must implement either
+\&\fBBIO_meth_set_read_ex\fR\|(3) or \fBBIO_meth_set_read\fR\|(3).
+.PP
+\&\fBSSL_set0_wbio()\fR works in the same as \fBSSL_set0_rbio()\fR except that it connects
+the BIO \fBwbio\fR for the write operations of the \fBssl\fR object. Note that if the
+rbio and wbio are the same then \fBSSL_set0_rbio()\fR and \fBSSL_set0_wbio()\fR each take
+ownership of one reference. Therefore, it may be necessary to increment the
+number of references available using \fBBIO_up_ref\fR\|(3) before calling the set0
+functions.
+.PP
+If using a custom BIO, \fBwbio\fR must implement
+\&\fBBIO_meth_set_write_ex\fR\|(3) or \fBBIO_meth_set_write\fR\|(3). It additionally must
+implement \fBBIO_flush\fR\|(3) using \fBBIO_CTRL_FLUSH\fR and \fBBIO_meth_set_ctrl\fR\|(3).
+If flushing is unnecessary with \fBwbio\fR, \fBBIO_flush\fR\|(3) should return one and
+do nothing.
+.PP
+\&\fBSSL_set_bio()\fR is similar to \fBSSL_set0_rbio()\fR and \fBSSL_set0_wbio()\fR except
+that it connects both the \fBrbio\fR and the \fBwbio\fR at the same time, and
+transfers the ownership of \fBrbio\fR and \fBwbio\fR to \fBssl\fR according to
+the following set of rules:
+.IP \(bu 2
+If neither the \fBrbio\fR or \fBwbio\fR have changed from their previous values
+then nothing is done.
+.IP \(bu 2
+If the \fBrbio\fR and \fBwbio\fR parameters are different and both are different
+to their
+previously set values then one reference is consumed for the rbio and one
+reference is consumed for the wbio.
+.IP \(bu 2
+If the \fBrbio\fR and \fBwbio\fR parameters are the same and the \fBrbio\fR is not
+the same as the previously set value then one reference is consumed.
+.IP \(bu 2
+If the \fBrbio\fR and \fBwbio\fR parameters are the same and the \fBrbio\fR is the
+same as the previously set value, then no additional references are consumed.
+.IP \(bu 2
+If the \fBrbio\fR and \fBwbio\fR parameters are different and the \fBrbio\fR is the
+same as the
+previously set value then one reference is consumed for the \fBwbio\fR and no
+references are consumed for the \fBrbio\fR.
+.IP \(bu 2
+If the \fBrbio\fR and \fBwbio\fR parameters are different and the \fBwbio\fR is the
+same as the previously set value and the old \fBrbio\fR and \fBwbio\fR values
+were the same as each other then one reference is consumed for the \fBrbio\fR
+and no references are consumed for the \fBwbio\fR.
+.IP \(bu 2
+If the \fBrbio\fR and \fBwbio\fR parameters are different and the \fBwbio\fR
+is the same as the
+previously set value and the old \fBrbio\fR and \fBwbio\fR values were different
+to each other, then one reference is consumed for the \fBrbio\fR and one
+reference is consumed for the \fBwbio\fR.
+.PP
+Because of this complexity, this function should be avoided;
+use \fBSSL_set0_rbio()\fR and \fBSSL_set0_wbio()\fR instead.
+.PP
+Where a new BIO is set on a QUIC connection SSL object, blocking mode will be
+disabled on that SSL object if the BIO cannot support blocking mode. If another
+BIO is subsequently set on the SSL object which can support blocking mode,
+blocking mode will not be automatically re-enabled. For more information, see
+\&\fBSSL_set_blocking_mode\fR\|(3).
+.SH "RETURN VALUES"
+.IX Header "RETURN VALUES"
+\&\fBSSL_set_bio()\fR, \fBSSL_set0_rbio()\fR and \fBSSL_set0_wbio()\fR cannot fail.
+.SH "SEE ALSO"
+.IX Header "SEE ALSO"
+\&\fBSSL_get_rbio\fR\|(3),
+\&\fBSSL_connect\fR\|(3), \fBSSL_accept\fR\|(3),
+\&\fBSSL_shutdown\fR\|(3), \fBssl\fR\|(7), \fBbio\fR\|(7)
+.SH HISTORY
+.IX Header "HISTORY"
+\&\fBSSL_set0_rbio()\fR and \fBSSL_set0_wbio()\fR were added in OpenSSL 1.1.0.
+.SH COPYRIGHT
+.IX Header "COPYRIGHT"
+Copyright 2000\-2023 The OpenSSL Project Authors. All Rights Reserved.
+.PP
+Licensed under the Apache License 2.0 (the "License").  You may not use
+this file except in compliance with the License.  You can obtain a copy
+in the file LICENSE in the source distribution or at
+<https://www.openssl.org/source/license.html>.