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

# [NAME](#NAME)

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

# [SYNOPSIS](#SYNOPSIS)

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

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

# [ARGUMENTS](#ARGUMENTS)

[gnutls\_session\_t session](#gnutls_session_t)

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

[gnutls\_vec\_push\_func vec\_func](#gnutls_vec_push_func)

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

# [DESCRIPTION](#DESCRIPTION)

Using this function you can override the default [writev(2)](/man/os/gnutls/writev.2) function for gnutls to send data. Setting this callback instead of **gnutls\_transport\_set\_push\_function()** is recommended since it introduces less overhead in the TLS handshake process.

*vec\_func* is of the form, ssize\_t (\*gnutls\_vec\_push\_func) (gnutls\_transport\_ptr\_t, const giovec\_t * iov, int iovcnt);

# [SINCE](#SINCE)

2.12.0

# [REPORTING BUGS](#REPORTING_BUGS)

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

# [COPYRIGHT](#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](#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/](https://www.gnutls.org/manual/)

3.8.13 gnutls

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Document: gnutls_transport_set_vec_push_function(3) from gnutls 3.8.13-r3 (Chainguard OS)
Source: https://gitlab.com/gnutls/gnutls