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gnutls_record_send2 - Man Page

API function


#include <gnutls/gnutls.h>

ssize_t gnutls_record_send2(gnutls_session_t session, const void * data, size_t data_size, size_t pad, unsigned flags);


gnutls_session_t session

is a gnutls_session_t type.

const void * data

contains the data to send

size_t data_size

is the length of the data

size_t pad

padding to be added to the record

unsigned flags

must be zero


This function is identical to gnutls_record_send() except that it takes an extra argument to specify padding to be added the record. To determine the maximum size of padding, use gnutls_record_get_max_size() and gnutls_record_overhead_size().

Note that in order for GnuTLS to provide constant time processing of padding and data in TLS1.3, the flag GNUTLS_SAFE_PADDING_CHECK must be used in gnutls_init().


The number of bytes sent, or a negative error code.  The number of bytes sent might be less than  data_size .  The maximum number of bytes this function can send in a single call depends on the negotiated maximum record size.



Reporting Bugs

Report bugs to <bugs@gnutls.org>.
Home page: https://www.gnutls.org

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



3.8.6 gnutls