gnutls_record_recv_early_data — API function


#include <gnutls/gnutls.h>

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


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


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.


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 .



Reporting Bugs

Report bugs to <>.
Home page:

See Also

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


3.6.9 gnutls