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author | marha <marha@users.sourceforge.net> | 2009-06-28 22:07:26 +0000 |
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committer | marha <marha@users.sourceforge.net> | 2009-06-28 22:07:26 +0000 |
commit | 3562e78743202e43aec8727005182a2558117eca (patch) | |
tree | 8f9113a77d12470c5c851a2a8e4cb02e89df7d43 /openssl/doc/ssl/SSL_SESSION_free.pod | |
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randrproto-1.2.2.tar.gz
scrnsaverproto-1.1.0.tar.gz
renderproto-0.9.3.tar.gz
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Diffstat (limited to 'openssl/doc/ssl/SSL_SESSION_free.pod')
-rw-r--r-- | openssl/doc/ssl/SSL_SESSION_free.pod | 55 |
1 files changed, 55 insertions, 0 deletions
diff --git a/openssl/doc/ssl/SSL_SESSION_free.pod b/openssl/doc/ssl/SSL_SESSION_free.pod new file mode 100644 index 000000000..110ec73ab --- /dev/null +++ b/openssl/doc/ssl/SSL_SESSION_free.pod @@ -0,0 +1,55 @@ +=pod + +=head1 NAME + +SSL_SESSION_free - free an allocated SSL_SESSION structure + +=head1 SYNOPSIS + + #include <openssl/ssl.h> + + void SSL_SESSION_free(SSL_SESSION *session); + +=head1 DESCRIPTION + +SSL_SESSION_free() decrements the reference count of B<session> and removes +the B<SSL_SESSION> structure pointed to by B<session> and frees up the allocated +memory, if the reference count has reached 0. + +=head1 NOTES + +SSL_SESSION objects are allocated, when a TLS/SSL handshake operation +is successfully completed. Depending on the settings, see +L<SSL_CTX_set_session_cache_mode(3)|SSL_CTX_set_session_cache_mode(3)>, +the SSL_SESSION objects are internally referenced by the SSL_CTX and +linked into its session cache. SSL objects may be using the SSL_SESSION object; +as a session may be reused, several SSL objects may be using one SSL_SESSION +object at the same time. It is therefore crucial to keep the reference +count (usage information) correct and not delete a SSL_SESSION 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 SSL_SESSION 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 +L<SSL_CTX_flush_sessions(3)|SSL_CTX_flush_sessions(3)> operation. + +SSL_SESSION_free() must only be called for SSL_SESSION objects, for +which the reference count was explicitly incremented (e.g. +by calling SSL_get1_session(), see L<SSL_get_session(3)|SSL_get_session(3)>) +or when the SSL_SESSION object was generated outside a TLS handshake +operation, e.g. by using L<d2i_SSL_SESSION(3)|d2i_SSL_SESSION(3)>. +It must not be called on other SSL_SESSION objects, as this would cause +incorrect reference counts and therefore program failures. + +=head1 RETURN VALUES + +SSL_SESSION_free() does not provide diagnostic information. + +=head1 SEE ALSO + +L<ssl(3)|ssl(3)>, L<SSL_get_session(3)|SSL_get_session(3)>, +L<SSL_CTX_set_session_cache_mode(3)|SSL_CTX_set_session_cache_mode(3)>, +L<SSL_CTX_flush_sessions(3)|SSL_CTX_flush_sessions(3)>, + L<d2i_SSL_SESSION(3)|d2i_SSL_SESSION(3)> + +=cut |