SSL_WANT(3) OpenSSL SSL_WANT(3)
SSL_want, SSL_want_nothing, SSL_want_read, SSL_want_write,
SSL_want_x509_lookup - obtain state information TLS/SSL I/O
operation
#include <openssl/ssl.h>
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);
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().
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 evalu-
ates 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 con-
sistent with the result of SSL_get_error(3).
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
MirBSD #10-current 2005-04-29 1
SSL_WANT(3) OpenSSL SSL_WANT(3)
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 con-
dition is true or 0 otherwise.
ssl(3), err(3), SSL_get_error(3)
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