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<p dir="auto">I recommend you take a look at <a href="https://gnutls.org/manual/gnutls.html#gnutls_005ftransport_005fset_005ferrno" rel="nofollow noreferrer noopener" target="_blank"><code>gnutls_transport_set_errno()</code></a>. You can implement non-blocking push/pull operation by setting <code>EAGAIN</code> or <code>EINTR</code> as appropriate and returning <code>-1</code>. For example, <code>mod_gnutls</code> does this to <a href="https://mod.gnutls.org/browser/mod_gnutls/src/gnutls_io.c#L792" rel="nofollow noreferrer noopener" target="_blank">implement push/pull in the Apache HTTPD filter chain</a>.</p>

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