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.\" ========================================================================
.\"
.IX Title "SSL_CTX_sess_set_cache_size 3"
.TH SSL_CTX_sess_set_cache_size 3 "2019-12-20" "1.0.2u" "OpenSSL"
.\" For nroff, turn off justification. Always turn off hyphenation; it makes
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.SH "NAME"
SSL_CTX_sess_set_cache_size, SSL_CTX_sess_get_cache_size \- manipulate session cache size
.SH "SYNOPSIS"
.IX Header "SYNOPSIS"
.Vb 1
\& #include <openssl/ssl.h>
\&
\& long SSL_CTX_sess_set_cache_size(SSL_CTX *ctx, long t);
\& long SSL_CTX_sess_get_cache_size(SSL_CTX *ctx);
.Ve
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
\&\fBSSL_CTX_sess_set_cache_size()\fR sets the size of the internal session cache
of context \fBctx\fR to \fBt\fR.
This value is a hint and not an absolute; see the notes below.
.PP
\&\fBSSL_CTX_sess_get_cache_size()\fR returns the currently valid session cache size.
.SH "NOTES"
.IX Header "NOTES"
The internal session cache size is \s-1SSL_SESSION_CACHE_MAX_SIZE_DEFAULT,\s0
currently 1024*20, so that up to 20000 sessions can be held. This size
can be modified using the \fBSSL_CTX_sess_set_cache_size()\fR call. A special
case is the size 0, which is used for unlimited size.
.PP
If adding the session makes the cache exceed its size, then unused
sessions are dropped from the end of the cache.
Cache space may also be reclaimed by calling
\&\fBSSL_CTX_flush_sessions\fR\|(3) to remove
expired sessions.
.PP
If the size of the session cache is reduced and more sessions are already
in the session cache, old session will be removed at the next time a
session shall be added. This removal is not synchronized with the
expiration of sessions.
.SH "RETURN VALUES"
.IX Header "RETURN VALUES"
\&\fBSSL_CTX_sess_set_cache_size()\fR returns the previously valid size.
.PP
\&\fBSSL_CTX_sess_get_cache_size()\fR returns the currently valid size.
.SH "SEE ALSO"
.IX Header "SEE ALSO"
\&\fBssl\fR\|(3),
\&\fBSSL_CTX_set_session_cache_mode\fR\|(3),
\&\fBSSL_CTX_sess_number\fR\|(3),
\&\fBSSL_CTX_flush_sessions\fR\|(3)