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[dragonfly.git] / secure / lib / libssl / man / SSL_SESSION_free.3
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80.\" If the F register is turned on, we'll generate
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96.TH SSL_SESSION_free 3 "0.9.7d" "2/Sep/2004" "OpenSSL"
97.UC
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188.\}
189.rm #[ #] #H #V #F C
984263bc 190.SH "NAME"
a7d27d5a 191SSL_SESSION_free \- free an allocated SSL_SESSION structure
984263bc 192.SH "SYNOPSIS"
a7d27d5a 193.PP
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194.Vb 1
195\& #include <openssl/ssl.h>
196.Ve
197.Vb 1
198\& void SSL_SESSION_free(SSL_SESSION *session);
199.Ve
200.SH "DESCRIPTION"
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201\fISSL_SESSION_free()\fR decrements the reference count of \fBsession\fR and removes
202the \fBSSL_SESSION\fR structure pointed to by \fBsession\fR and frees up the allocated
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203memory, if the the reference count has reached 0.
204.SH "NOTES"
a7d27d5a 205SSL_SESSION objects are allocated, when a TLS/SSL handshake operation
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206is successfully completed. Depending on the settings, see
207SSL_CTX_set_session_cache_mode(3),
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208the SSL_SESSION objects are internally referenced by the SSL_CTX and
209linked into its session cache. SSL objects may be using the SSL_SESSION object;
210as a session may be reused, several SSL objects may be using one SSL_SESSION
984263bc 211object at the same time. It is therefore crucial to keep the reference
a7d27d5a 212count (usage information) correct and not delete a SSL_SESSION object
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213that is still used, as this may lead to program failures due to
214dangling pointers. These failures may also appear delayed, e.g.
a7d27d5a 215when an SSL_SESSION object was completely freed as the reference count
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216incorrectly became 0, but it is still referenced in the internal
217session cache and the cache list is processed during a
218SSL_CTX_flush_sessions(3) operation.
219.PP
a7d27d5a 220\fISSL_SESSION_free()\fR must only be called for SSL_SESSION objects, for
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221which the reference count was explicitly incremented (e.g.
222by calling \fISSL_get1_session()\fR, see SSL_get_session(3))
a7d27d5a 223or when the SSL_SESSION object was generated outside a TLS handshake
984263bc 224operation, e.g. by using d2i_SSL_SESSION(3).
a7d27d5a 225It must not be called on other SSL_SESSION objects, as this would cause
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226incorrect reference counts and therefore program failures.
227.SH "RETURN VALUES"
a7d27d5a 228\fISSL_SESSION_free()\fR does not provide diagnostic information.
984263bc 229.SH "SEE ALSO"
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230ssl(3), SSL_get_session(3),
231SSL_CTX_set_session_cache_mode(3),
232SSL_CTX_flush_sessions(3),
233 d2i_SSL_SESSION(3)
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234
235.rn }` ''
236.IX Title "SSL_SESSION_free 3"
237.IX Name "SSL_SESSION_free - free an allocated SSL_SESSION structure"
238
239.IX Header "NAME"
240
241.IX Header "SYNOPSIS"
242
243.IX Header "DESCRIPTION"
244
245.IX Header "NOTES"
246
247.IX Header "RETURN VALUES"
248
249.IX Header "SEE ALSO"
250