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+.\"	$OpenBSD: SSL_set_fd.3,v 1.6 2025/06/08 22:52:00 schwarze Exp $
+.\"	OpenSSL b97fdb57 Nov 11 09:33:09 2016 +0100
+.\"
+.\" This file was written by Lutz Jaenicke <jaenicke@openssl.org>.
+.\" Copyright (c) 2000, 2013 The OpenSSL Project.  All rights reserved.
+.\"
+.\" Redistribution and use in source and binary forms, with or without
+.\" modification, are permitted provided that the following conditions
+.\" are met:
+.\"
+.\" 1. Redistributions of source code must retain the above copyright
+.\"    notice, this list of conditions and the following disclaimer.
+.\"
+.\" 2. Redistributions in binary form must reproduce the above copyright
+.\"    notice, this list of conditions and the following disclaimer in
+.\"    the documentation and/or other materials provided with the
+.\"    distribution.
+.\"
+.\" 3. All advertising materials mentioning features or use of this
+.\"    software must display the following acknowledgment:
+.\"    "This product includes software developed by the OpenSSL Project
+.\"    for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
+.\"
+.\" 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
+.\"    endorse or promote products derived from this software without
+.\"    prior written permission. For written permission, please contact
+.\"    openssl-core@openssl.org.
+.\"
+.\" 5. Products derived from this software may not be called "OpenSSL"
+.\"    nor may "OpenSSL" appear in their names without prior written
+.\"    permission of the OpenSSL Project.
+.\"
+.\" 6. Redistributions of any form whatsoever must retain the following
+.\"    acknowledgment:
+.\"    "This product includes software developed by the OpenSSL Project
+.\"    for use in the OpenSSL Toolkit (http://www.openssl.org/)"
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
+.\" EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+.\" PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
+.\" ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+.\" SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+.\" NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+.\" LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
+.\" STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+.\" ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
+.\" OF THE POSSIBILITY OF SUCH DAMAGE.
+.\"
+.Dd $Mdocdate: June 8 2025 $
+.Dt SSL_SET_FD 3
+.Os
+.Sh NAME
+.Nm SSL_set_fd ,
+.Nm SSL_set_rfd ,
+.Nm SSL_set_wfd
+.Nd connect the SSL object with a file descriptor
+.Sh SYNOPSIS
+.Lb libssl libcrypto
+.In openssl/ssl.h
+.Ft int
+.Fn SSL_set_fd "SSL *ssl" "int fd"
+.Ft int
+.Fn SSL_set_rfd "SSL *ssl" "int fd"
+.Ft int
+.Fn SSL_set_wfd "SSL *ssl" "int fd"
+.Sh DESCRIPTION
+.Fn SSL_set_fd
+sets the file descriptor
+.Fa fd
+as the input/output facility for the TLS/SSL (encrypted) side of
+.Fa ssl .
+.Fa fd
+will typically be the socket file descriptor of a network connection.
+.Pp
+When performing the operation, a socket
+.Vt BIO
+is automatically created to interface between the
+.Fa ssl
+and
+.Fa fd .
+The
+.Vt BIO
+and hence the SSL engine inherit the behaviour of
+.Fa fd .
+If
+.Fa fd
+is non-blocking, the
+.Fa ssl
+will also have non-blocking behaviour.
+.Pp
+If there was already a
+.Vt BIO
+connected to
+.Fa ssl ,
+.Xr BIO_free 3
+will be called (for both the reading and writing side, if different).
+.Pp
+.Fn SSL_set_rfd
+and
+.Fn SSL_set_wfd
+perform the respective action, but only for the read channel or the write
+channel, which can be set independently.
+.Sh RETURN VALUES
+The following return values can occur:
+.Bl -tag -width Ds
+.It 0
+The operation failed.
+Check the error stack to find out why.
+.It 1
+The operation succeeded.
+.El
+.Sh SEE ALSO
+.Xr BIO_new 3 ,
+.Xr ssl 3 ,
+.Xr SSL_accept 3 ,
+.Xr SSL_connect 3 ,
+.Xr SSL_get_fd 3 ,
+.Xr SSL_set_bio 3 ,
+.Xr SSL_shutdown 3
+.Sh HISTORY
+.Fn SSL_set_fd
+appeared in SSLeay 0.4 or earlier.
+.Fn SSL_set_rfd
+and
+.Fn SSL_set_wfd
+first appeared in SSLeay 0.6.0.
+These functions have been available since
+.Ox 2.4 .