=pod =head1 NAME SSL_shutdown - shut down a TLS/SSL connection =head1 SYNOPSIS #include int SSL_shutdown(SSL *ssl); =head1 DESCRIPTION SSL_shutdown() shuts down an active TLS/SSL connection. It sends the shutdown alert to the peer. The behaviour of SSL_shutdown() depends on the underlying BIO. If the underlying BIO is B, SSL_shutdown() will only return once the handshake has been finished or an error occurred. If the underlying BIO is B, SSL_shutdown() will also return when the underlying BIO could not satisfy the needs of SSL_shutdown() to continue the handshake. In this case a call to SSL_get_error() with the return value of SSL_shutdown() will yield B or B. The calling process then must repeat the call after taking appropriate action to satisfy the needs of SSL_shutdown(). The action depends on the underlying BIO. When using a non-blocking socket, nothing is to be done, but select() can be used to check for the required condition. When using a buffering BIO, like a BIO pair, data must be written into or retrieved out of the BIO before being able to continue. =head1 RETURN VALUES The following return values can occur: =over 4 =item 1 The shutdown was successfully completed. =item 0 The shutdown was not successful. Call SSL_get_error() with the return value B to find out the reason. =item -1 The shutdown was not successful because a fatal error occurred either at the protocol level or a connection failure occurred. It can also occur of action is need to continue the operation for non-blocking BIOs. Call SSL_get_error() with the return value B to find out the reason. =back =head1 SEE ALSO L, L, L, L, L =cut