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.\" ========================================================================
.\"
.IX Title "SSL_CTX_flush_sessions 3"
.TH SSL_CTX_flush_sessions 3 "2019-12-20" "1.0.2u" "OpenSSL"
.\" For nroff, turn off justification.  Always turn off hyphenation; it makes
.\" way too many mistakes in technical documents.
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.nh
.SH "NAME"
SSL_CTX_flush_sessions, SSL_flush_sessions \- remove expired sessions
.SH "SYNOPSIS"
.IX Header "SYNOPSIS"
.Vb 1
\& #include <openssl/ssl.h>
\&
\& void SSL_CTX_flush_sessions(SSL_CTX *ctx, long tm);
\& void SSL_flush_sessions(SSL_CTX *ctx, long tm);
.Ve
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
\&\fBSSL_CTX_flush_sessions()\fR causes a run through the session cache of
\&\fBctx\fR to remove sessions expired at time \fBtm\fR.
.PP
\&\fBSSL_flush_sessions()\fR is a synonym for \fBSSL_CTX_flush_sessions()\fR.
.SH "NOTES"
.IX Header "NOTES"
If enabled, the internal session cache will collect all sessions established
up to the specified maximum number (see \fBSSL_CTX_sess_set_cache_size()\fR).
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
\&\fBSSL_CTX_set_session_cache_mode\fR\|(3))
or manually by calling \fBSSL_CTX_flush_sessions()\fR.
.PP
The parameter \fBtm\fR specifies the time which should be used for the
expiration test, in most cases the actual time given by \fBtime\fR\|(0)
will be used.
.PP
\&\fBSSL_CTX_flush_sessions()\fR 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
\&\fBSSL_CTX_sess_set_get_cb\fR\|(3)).
.SH "RETURN VALUES"
.IX Header "RETURN VALUES"
.SH "SEE ALSO"
.IX Header "SEE ALSO"
\&\fBssl\fR\|(3),
\&\fBSSL_CTX_set_session_cache_mode\fR\|(3),
\&\fBSSL_CTX_set_timeout\fR\|(3),
\&\fBSSL_CTX_sess_set_get_cb\fR\|(3)