SSL_CTX_FLUSH_SESSIONS(3ossl) OpenSSL SSL_CTX_FLUSH_SESSIONS(3ossl)
NAME
SSL_CTX_flush_sessions_ex, SSL_CTX_flush_sessions - remove expired
sessions
SYNOPSIS
#include <openssl/ssl.h>
void SSL_CTX_flush_sessions_ex(SSL_CTX *ctx, time_t tm);
The following functions have been deprecated since OpenSSL 3.4, and can
be hidden entirely by defining OPENSSL_API_COMPAT with a suitable
version value, see openssl_user_macros(7):
void SSL_CTX_flush_sessions(SSL_CTX *ctx, long tm);
DESCRIPTION
SSL_CTX_flush_sessions_ex() causes a run through the session cache of
ctx to remove sessions expired at time tm.
SSL_CTX_flush_sessions(3) is an older variant of the function that is
not Y2038 safe due to usage of long datatype instead of time_t.
NOTES
If enabled, the internal session cache will collect all sessions
established up to the specified maximum number (see
SSL_CTX_sess_set_cache_size()). As sessions will not be reused ones
they are expired, they should be removed from the cache to save
resources. This can either be done automatically whenever 255 new
sessions were established (see SSL_CTX_set_session_cache_mode(3)) or
manually by calling SSL_CTX_flush_sessions_ex().
The parameter tm specifies the time which should be used for the
expiration test, in most cases the actual time given by time(0) will be
used.
SSL_CTX_flush_sessions_ex() will only check sessions stored in the
internal cache. When a session is found and removed, the
remove_session_cb is however called to synchronize with the external
cache (see SSL_CTX_sess_set_get_cb(3)).
RETURN VALUES
SSL_CTX_flush_sessions_ex() does not return a value.
SEE ALSO
ssl(7), SSL_CTX_set_session_cache_mode(3), SSL_CTX_set_timeout(3),
SSL_CTX_sess_set_get_cb(3)
HISTORY
SSL_CTX_flush_sessions_ex() was added in OpenSSL 3.4.
COPYRIGHT
Copyright 2001-2024 The OpenSSL Project Authors. All Rights Reserved.
Licensed under the Apache License 2.0 (the "License"). You may not use
this file except in compliance with the License. You can obtain a copy
in the file LICENSE in the source distribution or at
<https://www.openssl.org/source/license.html>.
3.5.4 2025-09-30 SSL_CTX_FLUSH_SESSIONS(3ossl)
openssl3 3.5.4 - Generated Tue Oct 7 13:05:59 CDT 2025