freebsd/secure/lib/libssl/man/SSL_SESSION_free.3

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.\" ========================================================================
.\"
.IX Title "SSL_SESSION_free 3"
.TH SSL_SESSION_free 3 "2007-03-15" "0.9.8e" "OpenSSL"
.SH "NAME"
SSL_SESSION_free \- free an allocated SSL_SESSION structure
.SH "SYNOPSIS"
.IX Header "SYNOPSIS"
.Vb 1
\& #include <openssl/ssl.h>
.Ve
.PP
.Vb 1
\& void SSL_SESSION_free(SSL_SESSION *session);
.Ve
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
\&\fISSL_SESSION_free()\fR decrements the reference count of \fBsession\fR and removes
the \fB\s-1SSL_SESSION\s0\fR structure pointed to by \fBsession\fR and frees up the allocated
memory, if the the reference count has reached 0.
.SH "NOTES"
.IX Header "NOTES"
\&\s-1SSL_SESSION\s0 objects are allocated, when a \s-1TLS/SSL\s0 handshake operation
is successfully completed. Depending on the settings, see
\&\fISSL_CTX_set_session_cache_mode\fR\|(3),
the \s-1SSL_SESSION\s0 objects are internally referenced by the \s-1SSL_CTX\s0 and
linked into its session cache. \s-1SSL\s0 objects may be using the \s-1SSL_SESSION\s0 object;
as a session may be reused, several \s-1SSL\s0 objects may be using one \s-1SSL_SESSION\s0
object at the same time. It is therefore crucial to keep the reference
count (usage information) correct and not delete a \s-1SSL_SESSION\s0 object
that is still used, as this may lead to program failures due to
dangling pointers. These failures may also appear delayed, e.g.
when an \s-1SSL_SESSION\s0 object was completely freed as the reference count
incorrectly became 0, but it is still referenced in the internal
session cache and the cache list is processed during a
\&\fISSL_CTX_flush_sessions\fR\|(3) operation.
.PP
\&\fISSL_SESSION_free()\fR must only be called for \s-1SSL_SESSION\s0 objects, for
which the reference count was explicitly incremented (e.g.
by calling \fISSL_get1_session()\fR, see \fISSL_get_session\fR\|(3))
or when the \s-1SSL_SESSION\s0 object was generated outside a \s-1TLS\s0 handshake
operation, e.g. by using \fId2i_SSL_SESSION\fR\|(3).
It must not be called on other \s-1SSL_SESSION\s0 objects, as this would cause
incorrect reference counts and therefore program failures.
.SH "RETURN VALUES"
.IX Header "RETURN VALUES"
\&\fISSL_SESSION_free()\fR does not provide diagnostic information.
.SH "SEE ALSO"
.IX Header "SEE ALSO"
\&\fIssl\fR\|(3), \fISSL_get_session\fR\|(3),
\&\fISSL_CTX_set_session_cache_mode\fR\|(3),
\&\fISSL_CTX_flush_sessions\fR\|(3),
 \fId2i_SSL_SESSION\fR\|(3)