195 lines
6.0 KiB
Groff
195 lines
6.0 KiB
Groff
.\" $NetBSD: SSL_SESSION_free.3,v 1.6 2002/08/09 16:15:42 itojun Exp $
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.\" ======================================================================
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.\"
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.IX Title "SSL_SESSION_free 3"
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.TH SSL_SESSION_free 3 "0.9.6g" "2002-06-10" "OpenSSL"
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.UC
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.SH "NAME"
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SSL_SESSION_free \- free an allocated \s-1SSL_SESSION\s0 structure
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.SH "LIBRARY"
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libcrypto, -lcrypto
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.SH "SYNOPSIS"
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.IX Header "SYNOPSIS"
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.Vb 1
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\& #include <openssl/ssl.h>
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.Ve
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.Vb 1
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\& void SSL_SESSION_free(SSL_SESSION *session);
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.Ve
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.SH "DESCRIPTION"
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.IX Header "DESCRIPTION"
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\&\fISSL_SESSION_free()\fR decrements the reference count of \fBsession\fR and removes
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the \fB\s-1SSL_SESSION\s0\fR structure pointed to by \fBsession\fR and frees up the allocated
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memory, if the the reference count has reached 0.
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.SH "NOTES"
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.IX Header "NOTES"
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\&\s-1SSL_SESSION\s0 objects are allocated, when a \s-1TLS/SSL\s0 handshake operation
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is successfully completed. Depending on the settings, see
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SSL_CTX_set_session_cache_mode(3),
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the \s-1SSL_SESSION\s0 objects are internally referenced by the \s-1SSL_CTX\s0 and
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linked into its session cache. \s-1SSL\s0 objects may be using the \s-1SSL_SESSION\s0 object;
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as a session may be reused, several \s-1SSL\s0 objects may be using one \s-1SSL_SESSION\s0
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object at the same time. It is therefore crucial to keep the reference
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count (usage information) correct and not delete a \s-1SSL_SESSION\s0 object
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that is still used, as this may lead to program failures due to
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dangling pointers. These failures may also appear delayed, e.g.
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when an \s-1SSL_SESSION\s0 object was completely freed as the reference count
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incorrectly became 0, but it is still referenced in the internal
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session cache and the cache list is processed during a
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SSL_CTX_flush_sessions(3) operation.
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.PP
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\&\fISSL_SESSION_free()\fR must only be called for \s-1SSL_SESSION\s0 objects, for
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which the reference count was explicitly incremented (e.g.
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by calling \fISSL_get1_session()\fR, see SSL_get_session(3))
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or when the \s-1SSL_SESSION\s0 object was generated outside a \s-1TLS\s0 handshake
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operation, e.g. by using d2i_SSL_SESSION(3).
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It must not be called on other \s-1SSL_SESSION\s0 objects, as this would cause
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incorrect reference counts and therefore program failures.
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.SH "RETURN VALUES"
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.IX Header "RETURN VALUES"
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\&\fISSL_SESSION_free()\fR does not provide diagnostic information.
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.SH "SEE ALSO"
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.IX Header "SEE ALSO"
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ssl(3), SSL_get_session(3),
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SSL_CTX_set_session_cache_mode(3),
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SSL_CTX_flush_sessions(3),
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d2i_SSL_SESSION(3)
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