/usr/man/cat.3/SSL_want_nothing.3

SSL_want(3)                  OpenSSL                  SSL_want(3)

NAME

     SSL_want, SSL_want_nothing, SSL_want_read, SSL_want_write,
     SSL_want_x509_lookup - obtain state information TLS/SSL I/O
     operation

SYNOPSIS

      #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);

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

1.0.2t               Last change: 2019-09-10                    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
     condition is true or 0 otherwise.

SEE ALSO

     ssl(3), err(3), SSL_get_error(3)

1.0.2t               Last change: 2019-09-10                    2

See also SSL_want(3)
See also SSL_want_read(3)
See also SSL_want_write(3)
See also SSL_want_x509_lookup(3)