SSL_want, SSL_want_nothing, SSL_want_read, SSL_want_write, SSL_want_x509_lookup
- obtain state information TLS/SSL I/O operation
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);
returns state information for the SSL object ssl
The other SSL_want_*() calls are shortcuts for the possible states returned by
examines the internal state information of the SSL object. Its
return values are similar to that of 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)
The following return values can currently occur for SSL_want()
- There is no data to be written or to be read.
- 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.
- 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.
- 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.
return 1, when the corresponding condition is
true or 0 otherwise.