_thread(3)</a>. The application should retry the operation after a currently executing asynchronous operation for the current thread has completed.</p>

</dd>
<dt id="SSL_ERROR_WANT_CLIENT_HELLO_CB">SSL_ERROR_WANT_CLIENT_HELLO_CB</dt>
<dd>

<p>The operation did not complete because an application callback set by SSL_CTX_set_client_hello_cb() has asked to be called again. The TLS/SSL I/O function should be called again later. Details depend on the application.</p>

</dd>
<dt id="SSL_ERROR_SYSCALL">SSL_ERROR_