1.\" $OpenBSD: SSL_CTX_free.3,v 1.4 2018/03/27 17:35:50 schwarze Exp $ 2.\" OpenSSL b97fdb57 Nov 11 09:33:09 2016 +0100 3.\" 4.\" This file was written by Lutz Jaenicke <jaenicke@openssl.org>. 5.\" Copyright (c) 2000, 2001, 2003 The OpenSSL Project. All rights reserved. 6.\" 7.\" Redistribution and use in source and binary forms, with or without 8.\" modification, are permitted provided that the following conditions 9.\" are met: 10.\" 11.\" 1. Redistributions of source code must retain the above copyright 12.\" notice, this list of conditions and the following disclaimer. 13.\" 14.\" 2. Redistributions in binary form must reproduce the above copyright 15.\" notice, this list of conditions and the following disclaimer in 16.\" the documentation and/or other materials provided with the 17.\" distribution. 18.\" 19.\" 3. All advertising materials mentioning features or use of this 20.\" software must display the following acknowledgment: 21.\" "This product includes software developed by the OpenSSL Project 22.\" for use in the OpenSSL Toolkit. (http://www.openssl.org/)" 23.\" 24.\" 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to 25.\" endorse or promote products derived from this software without 26.\" prior written permission. For written permission, please contact 27.\" openssl-core@openssl.org. 28.\" 29.\" 5. Products derived from this software may not be called "OpenSSL" 30.\" nor may "OpenSSL" appear in their names without prior written 31.\" permission of the OpenSSL Project. 32.\" 33.\" 6. Redistributions of any form whatsoever must retain the following 34.\" acknowledgment: 35.\" "This product includes software developed by the OpenSSL Project 36.\" for use in the OpenSSL Toolkit (http://www.openssl.org/)" 37.\" 38.\" THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY 39.\" EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 40.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 41.\" PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR 42.\" ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 43.\" SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 44.\" NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 45.\" LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 46.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, 47.\" STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 48.\" ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED 49.\" OF THE POSSIBILITY OF SUCH DAMAGE. 50.\" 51.Dd $Mdocdate: March 27 2018 $ 52.Dt SSL_CTX_FREE 3 53.Os 54.Sh NAME 55.Nm SSL_CTX_free 56.Nd free an allocated SSL_CTX object 57.Sh SYNOPSIS 58.In openssl/ssl.h 59.Ft void 60.Fn SSL_CTX_free "SSL_CTX *ctx" 61.Sh DESCRIPTION 62.Fn SSL_CTX_free 63decrements the reference count of 64.Fa ctx , 65and removes the 66.Vt SSL_CTX 67object pointed to by 68.Fa ctx 69and frees up the allocated memory if the reference count has reached 0. 70If 71.Fa ctx 72is a 73.Dv NULL 74pointer, no action occurs. 75.Pp 76It also calls the 77.Xr free 3 Ns ing 78procedures for indirectly affected items, if applicable: 79the session cache, the list of ciphers, the list of Client CAs, 80the certificates and keys. 81.Sh WARNINGS 82If a session-remove callback is set 83.Pq Xr SSL_CTX_sess_set_remove_cb 3 , 84this callback will be called for each session being freed from 85.Fa ctx Ns 's 86session cache. 87This implies that all corresponding sessions from an external session cache are 88removed as well. 89If this is not desired, the user should explicitly unset the callback by 90calling 91.Fn SSL_CTX_sess_set_remove_cb ctx NULL 92prior to calling 93.Fn SSL_CTX_free . 94.Sh SEE ALSO 95.Xr ssl 3 , 96.Xr SSL_CTX_new 3 , 97.Xr SSL_CTX_sess_set_get_cb 3 98.Sh HISTORY 99.Fn SSL_CTX_free 100first appeared in SSLeay 0.5.1 and has been available since 101.Ox 2.4 . 102