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= nng_msg_header_insert(3)
:doctype: manpage
:manmanual: nng
:mansource: nng
:manvolnum: 3
:copyright: Copyright 2018 Staysail Systems, Inc. <info@staysail.tech> \
Copyright 2018 Capitar IT Group BV <info@capitar.com> \
This software is supplied under the terms of the MIT License, a \
copy of which should be located in the distribution where this \
file was obtained (LICENSE.txt). A copy of the license may also \
be found online at https://opensource.org/licenses/MIT.
== NAME
nng_msg_header_insert, nng_msg_header_insert_u32 - prepend to message header
== SYNOPSIS
[source, c]
-----------
#include <nng/nng.h>
int nng_msg_header_insert(nng_msg *msg, const void *val, size_t size);
int nng_msg_header_insert_u32(nng_msg *msg, uint32_t val32);
-----------
== DESCRIPTION
The `nng_msg_header_insert()` and `nng_msg_header_insert_u32()` functions
prepend data to the front of the headers of message _msg_, reallocating
if necessary.
The first function prepends _size_ bytes, copying them from _val_. The
second function prepends the value _val32_ in network-byte order (big-endian).
== RETURN VALUES
This function returns 0 on success, and non-zero otherwise.
== ERRORS
`NNG_ENOMEM`:: Insufficient free memory exists.
== SEE ALSO
<<nng_msg_alloc#,nng_msg_alloc(3)>>,
<<nng_msg_header_append#,nng_msg_header_append(3)>>,
<<nng_msg_header_body#,nng_msg_header_body(3)>>,
<<nng_msg_header_chop#,nng_msg_header_chop(3)>>,
<<nng_msg_header_len#,nng_msg_header_len(3)>>,
<<nng_msg_header_trim#,nng_msg_header_trim(3)>>,
<<nng_msg_free#,nng_msg_free(3)>>,
<<nng_msg_realloc#,nng_msg_realloc(3)>>,
<<nng_strerror#,nng_strerror(3)>>,
<<nng#,nng(7)>>
== COPYRIGHT
Copyright 2018 mailto:info@staysail.tech[Staysail Systems, Inc.] +
Copyright 2018 mailto:info@capitar.com[Capitar IT Group BV]
This document is supplied under the terms of the
https://opensource.org/licenses/MIT[MIT License].
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