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=pod =head1 NAME SSL_want, SSL_want_nothing, SSL_want_read, SSL_want_write, SSL_want_x509_lookup - obtain state information TLS/SSL I/O operation =head1 SYNOPSIS #include int SSL_want(const SSL *ssl); int SSL_want_nothing(const SSL *ssl); int SSL_want_read(const SSL *ssl); int SSL_want_write(const SSL *ssl); int SSL_want_x509_lookup(const SSL *ssl); =head1 DESCRIPTION SSL_want() returns state information for the SSL object B. The other SSL_want_*() calls are shortcuts for the possible states returned by SSL_want(). =head1 NOTES SSL_want() examines the internal state information of the SSL object. Its return values are similar to that of L. Unlike L, which also evaluates the error queue, the results are obtained by examining an internal state flag only. The information must therefore only be used for normal operation under non-blocking I/O. Error conditions are not handled and must be treated using L. The result returned by SSL_want() should always be consistent with the result of L. =head1 RETURN VALUES The following return values can currently occur for SSL_want(): =over 4 =item SSL_NOTHING There is no data to be written or to be read. =item SSL_WRITING There are data in the SSL buffer that must be written to the underlying B layer in order to complete the actual SSL_*() operation. A call to L should return SSL_ERROR_WANT_WRITE. =item SSL_READING More data must be read from the underlying B layer in order to complete the actual SSL_*() operation. A call to L should return SSL_ERROR_WANT_READ. =item SSL_X509_LOOKUP The operation did not complete because an application callback set by SSL_CTX_set_client_cert_cb() has asked to be called again. A call to L should return SSL_ERROR_WANT_X509_LOOKUP. =back SSL_want_nothing(), SSL_want_read(), SSL_want_write(), SSL_want_x509_lookup() return 1, when the corresponding condition is true or 0 otherwise. =head1 SEE ALSO L, L, L =cut