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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
           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_x5_9_lookup() return 1, when the
       corresponding condition is true or 0 otherwise.

SEE ALSO
       ssl(3), err(3), SSL_get_error(3)



50                                               2013-03-05                                      SSL_want(3)