MirOS Manual: SSL_want(3), SSL_want_nothing(3), SSL_want_read(3), SSL_want_write(3), SSL_want_x509_lookup(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 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).

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

MirOS BSD #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.

SEE ALSO

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

MirOS BSD #10-current      2005-04-29                           2

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