gnutls_record_recv_early_data(3)   gnutls   gnutls_record_recv_early_data(3)

NAME         top

       gnutls_record_recv_early_data - API function

SYNOPSIS         top

       #include <gnutls/gnutls.h>

       ssize_t gnutls_record_recv_early_data(gnutls_session_t session, void
       * data, size_t data_size);

ARGUMENTS         top

       gnutls_session_t session
                   is a gnutls_session_t type.

       void * data the buffer that the data will be read into

       size_t data_size
                   the number of requested bytes

DESCRIPTION         top

       This function can be used by a searver to retrieve data sent early in
       the handshake processes when resuming a session.  This is used to
       implement a zero-roundtrip (0-RTT) mode.  It has the same semantics
       as gnutls_record_recv().

       This function can be called either in a handshake hook, or after the
       handshake is complete.

RETURNS         top

       The number of bytes received and zero when early data reading is
       complete.  A negative error code is returned in case of an error.  If
       no early data is received during the handshake, this function returns
       GNUTLS_E_REQUESTED_DATA_NOT_AVAILABLE.  The number of bytes received
       might be less than the requested
        data_size .

SINCE         top


REPORTING BUGS         top

       Report bugs to <>.
       Home page:

COPYRIGHT         top

       Copyright © 2001-2019 Free Software Foundation, Inc., and others.
       Copying and distribution of this file, with or without modification,
       are permitted in any medium without royalty provided the copyright
       notice and this notice are preserved.

SEE ALSO         top

       The full documentation for gnutls is maintained as a Texinfo manual.
       If the /usr/share/doc/gnutls/ directory does not contain the HTML
       form visit 

COLOPHON         top

       This page is part of the GnuTLS (GnuTLS Transport Layer Security
       Library) project.  Information about the project can be found at 
       ⟨⟩.  If you have a bug report for this manual
       page, send it to  This page was obtained from the
       tarball gnutls-3.6.9.tar.xz fetched from
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       any rendering problems in this HTML version of the page, or you
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gnutls                              3.6.9   gnutls_record_recv_early_data(3)