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131 .IX Title "SSL_CTX_sess_set_cache_size 3"
132 .TH SSL_CTX_sess_set_cache_size 3 "2017-05-25" "1.0.2l" "OpenSSL"
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138 SSL_CTX_sess_set_cache_size, SSL_CTX_sess_get_cache_size \- manipulate session cache size
140 .IX Header "SYNOPSIS"
142 \& #include <openssl/ssl.h>
144 \& long SSL_CTX_sess_set_cache_size(SSL_CTX *ctx, long t);
145 \& long SSL_CTX_sess_get_cache_size(SSL_CTX *ctx);
148 .IX Header "DESCRIPTION"
149 \&\fISSL_CTX_sess_set_cache_size()\fR sets the size of the internal session cache
150 of context \fBctx\fR to \fBt\fR.
151 This value is a hint and not an absolute; see the notes below.
153 \&\fISSL_CTX_sess_get_cache_size()\fR returns the currently valid session cache size.
156 The internal session cache size is \s-1SSL_SESSION_CACHE_MAX_SIZE_DEFAULT,\s0
157 currently 1024*20, so that up to 20000 sessions can be held. This size
158 can be modified using the \fISSL_CTX_sess_set_cache_size()\fR call. A special
159 case is the size 0, which is used for unlimited size.
161 If adding the session makes the cache exceed its size, then unused
162 sessions are dropped from the end of the cache.
163 Cache space may also be reclaimed by calling
164 \&\fISSL_CTX_flush_sessions\fR\|(3) to remove
167 If the size of the session cache is reduced and more sessions are already
168 in the session cache, old session will be removed at the next time a
169 session shall be added. This removal is not synchronized with the
170 expiration of sessions.
172 .IX Header "RETURN VALUES"
173 \&\fISSL_CTX_sess_set_cache_size()\fR returns the previously valid size.
175 \&\fISSL_CTX_sess_get_cache_size()\fR returns the currently valid size.
177 .IX Header "SEE ALSO"
179 \&\fISSL_CTX_set_session_cache_mode\fR\|(3),
180 \&\fISSL_CTX_sess_number\fR\|(3),
181 \&\fISSL_CTX_flush_sessions\fR\|(3)