58 lines
1.6 KiB
Text
58 lines
1.6 KiB
Text
= nng_msg_header(3)
|
|
//
|
|
// Copyright 2018 Staysail Systems, Inc. <info@staysail.tech>
|
|
// Copyright 2018 Capitar IT Group BV <info@capitar.com>
|
|
//
|
|
// This document 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
|
|
xref:nng_options.5.adoc#NNG_OPT_RAW[`NNG_OPT_RAW`] option.)
|
|
|
|
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
|
|
|
|
[.text-left]
|
|
xref:nng_msg_alloc.3.adoc[nng_msg_alloc(3)],
|
|
xref:nng_msg_body.3.adoc[nng_msg_body(3)],
|
|
xref:nng_msg_free.3.adoc[nng_msg_free(3)],
|
|
xref:nng_msg_header_append.3.adoc[nng_msg_header_append(3)],
|
|
xref:nng_msg_header_chop.3.adoc[nng_msg_header_chop(3)],
|
|
xref:nng_msg_header_insert.3.adoc[nng_msg_header_insert(3)]
|
|
xref:nng_msg_header_len.3.adoc[nng_msg_header_len(3)],
|
|
xref:nng_msg_header_trim.3.adoc[nng_msg_header_trim(3)],
|
|
xref:nng_msg.5.adoc[nng_msg(5)],
|
|
xref:nng.7.adoc[nng(7)]
|