1=pod 2 3=head1 NAME 4 5SSL_CTX_flush_sessions_ex, SSL_CTX_flush_sessions - remove expired sessions 6 7=head1 SYNOPSIS 8 9 #include <openssl/ssl.h> 10 11 void SSL_CTX_flush_sessions_ex(SSL_CTX *ctx, time_t tm); 12 13The following functions have been deprecated since OpenSSL 3.4, and can be 14hidden entirely by defining B<OPENSSL_API_COMPAT> with a suitable version value, 15see L<openssl_user_macros(7)>: 16 17 void SSL_CTX_flush_sessions(SSL_CTX *ctx, long tm); 18 19=head1 DESCRIPTION 20 21SSL_CTX_flush_sessions_ex() causes a run through the session cache of 22B<ctx> to remove sessions expired at time B<tm>. 23 24SSL_CTX_flush_sessions() is an older variant of the function that is not 25Y2038 safe due to usage of long datatype instead of time_t. 26 27=head1 NOTES 28 29If enabled, the internal session cache will collect all sessions established 30up to the specified maximum number (see SSL_CTX_sess_set_cache_size()). 31As sessions will not be reused ones they are expired, they should be 32removed from the cache to save resources. This can either be done 33automatically whenever 255 new sessions were established (see 34L<SSL_CTX_set_session_cache_mode(3)>) 35or manually by calling SSL_CTX_flush_sessions_ex(). 36 37The parameter B<tm> specifies the time which should be used for the 38expiration test, in most cases the actual time given by time(0) 39will be used. 40 41SSL_CTX_flush_sessions_ex() will only check sessions stored in the internal 42cache. When a session is found and removed, the remove_session_cb is however 43called to synchronize with the external cache (see 44L<SSL_CTX_sess_set_get_cb(3)>). 45 46=head1 RETURN VALUES 47 48SSL_CTX_flush_sessions_ex() does not return a value. 49 50=head1 SEE ALSO 51 52L<ssl(7)>, 53L<SSL_CTX_set_session_cache_mode(3)>, 54L<SSL_CTX_set_timeout(3)>, 55L<SSL_CTX_sess_set_get_cb(3)> 56 57=head1 HISTORY 58 59SSL_CTX_flush_sessions_ex() was added in OpenSSL 3.4. 60 61=head1 COPYRIGHT 62 63Copyright 2001-2024 The OpenSSL Project Authors. All Rights Reserved. 64 65Licensed under the Apache License 2.0 (the "License"). You may not use 66this file except in compliance with the License. You can obtain a copy 67in the file LICENSE in the source distribution or at 68L<https://www.openssl.org/source/license.html>. 69 70=cut 71