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+=pod
+
+=head1 NAME
+
+SSL_set_shutdown, SSL_get_shutdown - manipulate shutdown state of an SSL connection
+
+=head1 SYNOPSIS
+
+ #include <openssl/ssl.h>
+
+ void SSL_set_shutdown(SSL *ssl, int mode);
+
+ int SSL_get_shutdown(const SSL *ssl);
+
+=head1 DESCRIPTION
+
+SSL_set_shutdown() sets the shutdown state of B<ssl> to B<mode>.
+
+SSL_get_shutdown() returns the shutdown mode of B<ssl>.
+
+=head1 NOTES
+
+The shutdown state of an ssl connection is a bitmask of:
+
+=over 4
+
+=item Z<>0
+
+No shutdown setting, yet.
+
+=item SSL_SENT_SHUTDOWN
+
+A close_notify shutdown alert was sent to the peer, the connection is being
+considered closed and the session is closed and correct.
+
+=item SSL_RECEIVED_SHUTDOWN
+
+A shutdown alert was received form the peer, either a normal close_notify
+or a fatal error.
+
+=back
+
+SSL_SENT_SHUTDOWN and SSL_RECEIVED_SHUTDOWN can be set at the same time.
+
+The shutdown state of the connection is used to determine the state of
+the ssl session. If the session is still open, when
+L<SSL_clear(3)> or L<SSL_free(3)> is called,
+it is considered bad and removed according to RFC2246.
+The actual condition for a correctly closed session is SSL_SENT_SHUTDOWN
+(according to the TLS RFC, it is acceptable to only send the close_notify
+alert but to not wait for the peer's answer, when the underlying connection
+is closed).
+SSL_set_shutdown() can be used to set this state without sending a
+close alert to the peer (see L<SSL_shutdown(3)>).
+
+If a close_notify was received, SSL_RECEIVED_SHUTDOWN will be set,
+for setting SSL_SENT_SHUTDOWN the application must however still call
+L<SSL_shutdown(3)> or SSL_set_shutdown() itself.
+
+=head1 RETURN VALUES
+
+SSL_set_shutdown() does not return diagnostic information.
+
+SSL_get_shutdown() returns the current setting.
+
+=head1 SEE ALSO
+
+L<ssl(7)>, L<SSL_shutdown(3)>,
+L<SSL_CTX_set_quiet_shutdown(3)>,
+L<SSL_clear(3)>, L<SSL_free(3)>
+
+=head1 COPYRIGHT
+
+Copyright 2001-2018 The OpenSSL Project Authors. All Rights Reserved.
+
+Licensed under the OpenSSL license (the "License"). You may not use
+this file except in compliance with the License. You can obtain a copy
+in the file LICENSE in the source distribution or at
+L<https://www.openssl.org/source/license.html>.
+
+=cut