docs: Added All OpenBSD Manuals

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+.\"	$OpenBSD: SSL_CTX_set_timeout.3,v 1.5 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) 2001 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_CTX_SET_TIMEOUT 3
+.Os
+.Sh NAME
+.Nm SSL_CTX_set_timeout ,
+.Nm SSL_CTX_get_timeout
+.Nd manipulate timeout values for session caching
+.Sh SYNOPSIS
+.Lb libssl libcrypto
+.In openssl/ssl.h
+.Ft long
+.Fn SSL_CTX_set_timeout "SSL_CTX *ctx" "long t"
+.Ft long
+.Fn SSL_CTX_get_timeout "SSL_CTX *ctx"
+.Sh DESCRIPTION
+.Fn SSL_CTX_set_timeout
+sets the timeout for newly created sessions for
+.Fa ctx
+to
+.Fa t .
+The timeout value
+.Fa t
+must be given in seconds.
+.Pp
+.Fn SSL_CTX_get_timeout
+returns the currently set timeout value for
+.Fa ctx .
+.Pp
+Whenever a new session is created, it is assigned a maximum lifetime.
+This lifetime is specified by storing the creation time of the session and the
+timeout value valid at this time.
+If the actual time is later than creation time plus timeout,
+the session is not reused.
+.Pp
+Due to this realization, all sessions behave according to the timeout value
+valid at the time of the session negotiation.
+Changes of the timeout value do not affect already established sessions.
+.Pp
+The expiration time of a single session can be modified using the
+.Xr SSL_SESSION_get_time 3
+family of functions.
+.Pp
+Expired sessions are removed from the internal session cache, whenever
+.Xr SSL_CTX_flush_sessions 3
+is called, either directly by the application or automatically (see
+.Xr SSL_CTX_set_session_cache_mode 3 ) .
+.Pp
+The default value for session timeout is decided on a per-protocol basis; see
+.Xr SSL_get_default_timeout 3 .
+All currently supported protocols have the same default timeout value of 300
+seconds.
+.Sh RETURN VALUES
+.Fn SSL_CTX_set_timeout
+returns the previously set timeout value.
+.Pp
+.Fn SSL_CTX_get_timeout
+returns the currently set timeout value.
+.Sh SEE ALSO
+.Xr ssl 3 ,
+.Xr SSL_CTX_flush_sessions 3 ,
+.Xr SSL_CTX_set_session_cache_mode 3 ,
+.Xr SSL_get_default_timeout 3 ,
+.Xr SSL_SESSION_get_time 3
+.Sh HISTORY
+.Fn SSL_CTX_set_timeout
+and
+.Fn SSL_CTX_get_timeout
+first appeared in SSLeay 0.6.1 and have been available since
+.Ox 2.4 .