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<?xml version="1.0" ?> <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"> <head> <title>SSL_want</title> <meta http-equiv="content-type" content="text/html; charset=utf-8" /> <link rev="made" href="mailto:root@hsxx.drive.ne.jp" /> </head> <body style="background-color: white"> <!-- INDEX BEGIN --> <div name="index"> <p><a name="__index__"></a></p> <ul> <li><a href="#name">NAME</a></li> <li><a href="#synopsis">SYNOPSIS</a></li> <li><a href="#description">DESCRIPTION</a></li> <li><a href="#notes">NOTES</a></li> <li><a href="#return_values">RETURN VALUES</a></li> <li><a href="#see_also">SEE ALSO</a></li> <li><a href="#history">HISTORY</a></li> <li><a href="#copyright">COPYRIGHT</a></li> </ul> <hr name="index" /> </div> <!-- INDEX END --> <p> </p> <hr /> <h1><a name="name">NAME</a></h1> <p>SSL_want, SSL_want_nothing, SSL_want_read, SSL_want_write, SSL_want_x509_lookup, SSL_want_async, SSL_want_async_job, SSL_want_client_hello_cb - obtain state information TLS/SSL I/O operation</p> <p> </p> <hr /> <h1><a name="synopsis">SYNOPSIS</a></h1> <pre> #include <openssl/ssl.h></pre> <pre> 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); int SSL_want_async(const SSL *ssl); int SSL_want_async_job(const SSL *ssl); int SSL_want_client_hello_cb(const SSL *ssl);</pre> <p> </p> <hr /> <h1><a name="description">DESCRIPTION</a></h1> <p><code>SSL_want()</code> returns state information for the SSL object <strong>ssl</strong>.</p> <p>The other SSL_want_*() calls are shortcuts for the possible states returned by <code>SSL_want()</code>.</p> <p> </p> <hr /> <h1><a name="notes">NOTES</a></h1> <p><code>SSL_want()</code> examines the internal state information of the SSL object. Its return values are similar to that of <em>SSL_get_error(3)</em>. Unlike <em>SSL_get_error(3)</em>, 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 nonblocking I/O. Error conditions are not handled and must be treated using <em>SSL_get_error(3)</em>.</p> <p>The result returned by <code>SSL_want()</code> should always be consistent with the result of <em>SSL_get_error(3)</em>.</p> <p> </p> <hr /> <h1><a name="return_values">RETURN VALUES</a></h1> <p>The following return values can currently occur for SSL_want():</p> <dl> <dt><strong><a name="ssl_nothing" class="item">SSL_NOTHING</a></strong></dt> <dd> <p>There is no data to be written or to be read.</p> </dd> <dt><strong><a name="ssl_writing" class="item">SSL_WRITING</a></strong></dt> <dd> <p>There are data in the SSL buffer that must be written to the underlying <strong>BIO</strong> layer in order to complete the actual SSL_*() operation. A call to <em>SSL_get_error(3)</em> should return SSL_ERROR_WANT_WRITE.</p> </dd> <dt><strong><a name="ssl_reading" class="item">SSL_READING</a></strong></dt> <dd> <p>More data must be read from the underlying <strong>BIO</strong> layer in order to complete the actual SSL_*() operation. A call to <em>SSL_get_error(3)</em> should return SSL_ERROR_WANT_READ.</p> </dd> <dt><strong><a name="ssl_x509_lookup" class="item">SSL_X509_LOOKUP</a></strong></dt> <dd> <p>The operation did not complete because an application callback set by <code>SSL_CTX_set_client_cert_cb()</code> has asked to be called again. A call to <em>SSL_get_error(3)</em> should return SSL_ERROR_WANT_X509_LOOKUP.</p> </dd> <dt><strong><a name="ssl_async_paused" class="item">SSL_ASYNC_PAUSED</a></strong></dt> <dd> <p>An asynchronous operation partially completed and was then paused. See <em>SSL_get_all_async_fds(3)</em>. A call to <em>SSL_get_error(3)</em> should return SSL_ERROR_WANT_ASYNC.</p> </dd> <dt><strong><a name="ssl_async_no_jobs" class="item">SSL_ASYNC_NO_JOBS</a></strong></dt> <dd> <p>The asynchronous job could not be started because there were no async jobs available in the pool (see ASYNC_init_thread(3)). A call to <em>SSL_get_error(3)</em> should return SSL_ERROR_WANT_ASYNC_JOB.</p> </dd> <dt><strong><a name="ssl_client_hello_cb" class="item">SSL_CLIENT_HELLO_CB</a></strong></dt> <dd> <p>The operation did not complete because an application callback set by <code>SSL_CTX_set_client_hello_cb()</code> has asked to be called again. A call to <em>SSL_get_error(3)</em> should return SSL_ERROR_WANT_CLIENT_HELLO_CB.</p> </dd> </dl> <p><code>SSL_want_nothing()</code>, <code>SSL_want_read()</code>, <code>SSL_want_write()</code>, SSL_want_x509_lookup(), <code>SSL_want_async()</code>, <code>SSL_want_async_job()</code>, and <code>SSL_want_client_hello_cb()</code> return 1, when the corresponding condition is true or 0 otherwise.</p> <p> </p> <hr /> <h1><a name="see_also">SEE ALSO</a></h1> <p><em>ssl(7)</em>, <em>SSL_get_error(3)</em></p> <p> </p> <hr /> <h1><a name="history">HISTORY</a></h1> <p>The <code>SSL_want_client_hello_cb()</code> function and the SSL_CLIENT_HELLO_CB return value were added in OpenSSL 1.1.1.</p> <p> </p> <hr /> <h1><a name="copyright">COPYRIGHT</a></h1> <p>Copyright 2001-2020 The OpenSSL Project Authors. All Rights Reserved.</p> <p>Licensed under the OpenSSL license (the "License"). You may not use this file except in compliance with the License. You can obtain a copy in the file LICENSE in the source distribution or at <a href="https://www.openssl.org/source/license.html">https://www.openssl.org/source/license.html</a>.</p> </body> </html>