Section: gnutls (3)
gnutls_record_send - API function
ssize_t gnutls_record_send(gnutls_session_t session, const void * data, size_t data_size);
- 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
This function has the similar semantics with send()
. The only
difference is that it accepts a GnuTLS session, and uses different
Note that if the send buffer is full, send()
will block this
function. See the send()
documentation for more information.
You can replace the default push function which is send(), by using
If the EINTR is returned by the internal push function
then GNUTLS_E_INTERRUPTED will be returned. If
GNUTLS_E_INTERRUPTED or GNUTLS_E_AGAIN is returned, you must
call this function again with the exact same parameters, or provide a
NULL pointer for data and 0 for data_size , in order to write the
same data as before. If you wish to discard the previous data instead
of retrying, you must call gnutls_record_discard_queued() before
calling this function with different parameters. Note that the latter
works only on special transports (e.g., UDP).
Note that in DTLS this function will return the GNUTLS_E_LARGE_PACKET
error code if the send data exceed the data MTU value - as returned
by gnutls_dtls_get_data_mtu(). The errno value EMSGSIZE
also maps to GNUTLS_E_LARGE_PACKET.
Note that since 3.2.13 this function can be called under cork in DTLS
mode, and will refuse to send data over the MTU size by returning
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.
Report bugs to <email@example.com
Home page: https://www.gnutls.org
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.
The full documentation for
is maintained as a Texinfo manual.
If the /usr/share/doc/gnutls/
directory does not contain the HTML form visit