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+.\"	$OpenBSD: SSL_accept.3,v 1.7 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, 2001, 2002, 2003 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_ACCEPT 3
+.Os
+.Sh NAME
+.Nm SSL_accept
+.Nd wait for a TLS/SSL client to initiate a TLS/SSL handshake
+.Sh SYNOPSIS
+.Lb libssl libcrypto
+.In openssl/ssl.h
+.Ft int
+.Fn SSL_accept "SSL *ssl"
+.Sh DESCRIPTION
+.Fn SSL_accept
+waits for a TLS/SSL client to initiate the TLS/SSL handshake.
+The communication channel must already have been set and assigned to the
+.Fa ssl
+object by setting an underlying
+.Vt BIO .
+.Pp
+The behaviour of
+.Fn SSL_accept
+depends on the underlying
+.Vt BIO .
+.Pp
+If the underlying
+.Vt BIO
+is
+.Em blocking ,
+.Fn SSL_accept
+will only return once the handshake has been finished or an error occurred.
+.Pp
+If the underlying
+.Vt BIO
+is
+.Em non-blocking ,
+.Fn SSL_accept
+will also return when the underlying
+.Vt BIO
+could not satisfy the needs of
+.Fn SSL_accept
+to continue the handshake, indicating the problem by the return value \(mi1.
+In this case a call to
+.Xr SSL_get_error 3
+with the
+return value of
+.Fn SSL_accept
+will yield
+.Dv SSL_ERROR_WANT_READ
+or
+.Dv SSL_ERROR_WANT_WRITE .
+The calling process then must repeat the call after taking appropriate action
+to satisfy the needs of
+.Fn SSL_accept .
+The action depends on the underlying
+.Dv BIO .
+When using a non-blocking socket, nothing is to be done, but
+.Xr select 2
+can be used to check for the required condition.
+When using a buffering
+.Vt BIO ,
+like a
+.Vt BIO
+pair, data must be written into or retrieved out of the
+.Vt BIO
+before being able to continue.
+.Sh RETURN VALUES
+The following return values can occur:
+.Bl -tag -width Ds
+.It 0
+The TLS/SSL handshake was not successful but was shut down controlled and by
+the specifications of the TLS/SSL protocol.
+Call
+.Xr SSL_get_error 3
+with the return value
+.Fa ret
+to find out the reason.
+.It 1
+The TLS/SSL handshake was successfully completed,
+and a TLS/SSL connection has been established.
+.It <0
+The TLS/SSL handshake was not successful because a fatal error occurred either
+at the protocol level or a connection failure occurred.
+The shutdown was not clean.
+It can also occur of action is need to continue the operation for non-blocking
+.Vt BIO Ns
+s.
+Call
+.Xr SSL_get_error 3
+with the return value
+.Fa ret
+to find out the reason.
+.El
+.Sh SEE ALSO
+.Xr BIO_new 3 ,
+.Xr ssl 3 ,
+.Xr SSL_connect 3 ,
+.Xr SSL_CTX_new 3 ,
+.Xr SSL_do_handshake 3 ,
+.Xr SSL_get_error 3 ,
+.Xr SSL_set_connect_state 3 ,
+.Xr SSL_shutdown 3
+.Sh HISTORY
+.Fn SSL_accept
+appeared in SSLeay 0.4 or earlier and has been available since
+.Ox 2.4 .