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);
DESCRIPTION
SSL_want() returns state information for the SSL object ssl.
The other SSL_want_*() calls are shortcuts for the possible states returned
by SSL_want().
NOTES
SSL_want() examines the internal state information of the SSL object. Its
return values are similar to that of SSL_get_error(3).
Unlike SSL_get_error(3), 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 SSL_get_error(3).
The result returned by SSL_want() should always be consistent with
the result of SSL_get_error(3).
RETURN VALUES
The following return values can currently occur for SSL_want():
SSL_NOTHING
There is no data to be written or to be read.
SSL_WRITING
There are data in the SSL buffer that must be written to the underlying
BIO layer in order to complete the actual SSL_*() operation.
A call to SSL_get_error(3) should return
SSL_ERROR_WANT_WRITE.
SSL_READING
More data must be read from the underlying BIO layer in order to
complete the actual SSL_*() operation.
A call to SSL_get_error(3) should return
SSL_ERROR_WANT_READ.
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 SSL_get_error(3) should return
SSL_ERROR_WANT_X509_LOOKUP.
SSL_want_nothing(), SSL_want_read(), SSL_want_write(), SSL_want_x509_lookup()
return 1, when the corresponding condition is true or 0 otherwise.
