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= nng_msg_header(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 - return message header
== SYNOPSIS
[source, c]
-----------
#include <nng/nng.h>
void *nng_msg_header(nng_msg *msg);
-----------
== DESCRIPTION
The `nng_msg_header()` function returns a pointer to the start of the header
content of the message _msg_.
NOTE: The message header contains protocol-specific header content. Most
applications should not need to access this content, but it is available
for raw mode sockets (set with the `NNG_OPT_RAW` option -- see
<<nng_setopt#,nng_setopt(3)>> for more details.)
NOTE: The value returned by this is invalidated by a call to any of the
functions that modify the message or the header content.
== RETURN VALUES
Pointer to start of message header.
== ERRORS
None.
== SEE ALSO
<<nng_msg_alloc#,nng_msg_alloc(3)>>,
<<nng_msg_body#,nng_msg_body(3)>>,
<<nng_msg_free#,nng_msg_free(3)>>,
<<nng_msg_header_append#,nng_msg_header_append(3)>>,
<<nng_msg_header_chop#,nng_msg_header_chop(3)>>,
<<nng_msg_header_insert#,nng_msg_header_insert(3)>>
<<nng_msg_header_len#,nng_msg_header_len(3)>>,
<<nng_msg_header_trim#,nng_msg_header_trim(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].
|
