---
name: "gnutls_transport_set_push_function"
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_transport_set_push_function"
---

# gnutls\_transport\_set\_push\_function(3)

API function

## NAME

gnutls\_transport\_set\_push\_function - API function

## SYNOPSIS

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

**void gnutls\_transport\_set\_push\_function(gnutls\_session\_t** *session***, gnutls\_push\_func** *push\_func***);**

## ARGUMENTS

- gnutls\_session\_t session

  is a **gnutls\_session\_t** type.

- gnutls\_push\_func push\_func

  a callback function similar to **write()**

## DESCRIPTION

This is the function where you set a push function for gnutls to use in order to send data.  If you are going to use berkeley style sockets, you do not need to use this function since the default [send(2)](/send/2.md) will probably be ok.  Otherwise you should specify this function for gnutls to be able to send data. The callback should return a positive number indicating the bytes sent, and -1 on error.

 *push\_func* is of the form, ssize\_t (\*gnutls\_push\_func)(gnutls\_transport\_ptr\_t, const void\*, size\_t);

## 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/