[gnutls-devel] GnuTLS | use custom transport with gnutls (#673)

[Development of GNU's TLS library]

I recommend you take a look at [`gnutls_transport_set_errno()`](https://gnutls.org/manual/gnutls.html#gnutls_005ftransport_005fset_005ferrno). You can implement non-blocking push/pull operation by setting `EAGAIN` or `EINTR` as appropriate and returning `-1`. For example, `mod_gnutls` does this to [implement push/pull in the Apache HTTPD filter chain](https://mod.gnutls.org/browser/mod_gnutls/src/gnutls_io.c#L792).

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