---
name: "gnutls_record_send_early_data"
section: "3"
platform: "linux"
package: "gnutls"
version: "3.8.13-3"
release: "Arch Linux 2026-11-01"
platforms: ["linux"]
url: "https://new.carta.tech/gnutls_record_send_early_data"
---

# gnutls\_record\_send\_early\_data(3)

API function

## NAME

gnutls\_record\_send\_early\_data - API function

## SYNOPSIS

**#include \<gnutls/gnutls.h\>**

**ssize\_t gnutls\_record\_send\_early\_data(gnutls\_session\_t** *session***, const void \*** *data***, size\_t** *data\_size***);**

## ARGUMENTS

- 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

## DESCRIPTION

This function can be used by a client to send data 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\_send()**.

There may be a limit to the amount of data sent as early data.  Use **gnutls\_record\_get\_max\_early\_data\_size()** to check the limit.  If the limit exceeds, this function returns **GNUTLS\_E\_RECORD\_LIMIT\_REACHED**.

## RETURNS

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.

## SINCE

3\.6.5

## REPORTING BUGS

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

## COPYRIGHT

Copyright © 2001-2023 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

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

- https://www.gnutls.org/manual/