= nng_msg_header_append(3)
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//
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// Copyright 2018 Staysail Systems, Inc. <info@staysail.tech>
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// Copyright 2018 Capitar IT Group BV <info@capitar.com>
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//
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// This document is supplied under the terms of the MIT License, a
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// copy of which should be located in the distribution where this
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// file was obtained (LICENSE.txt). A copy of the license may also be
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// found online at https://opensource.org/licenses/MIT.
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//
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== NAME
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nng_msg_header_append - append to message header
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== SYNOPSIS
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[source, c]
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----
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#include <nng/nng.h>
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int nng_msg_header_append(nng_msg *msg, const void *val, size_t size);
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int nng_msg_header_append_u16(nng_msg *msg, uint16_t val16);
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int nng_msg_header_append_u32(nng_msg *msg, uint32_t val32);
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int nng_msg_header_append_u64(nng_msg *msg, uint64_t val64);
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----
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== DESCRIPTION
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The `nng_msg_header_append()` family of functions appends data to
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the end of the headers of message _msg_, reallocating it if necessary.
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The first function appends _size_ bytes, copying them from _val_.
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The remaining functions append the value (such as _val32_) in
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network-byte order (big-endian).
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== RETURN VALUES
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These functions return 0 on success, and non-zero otherwise.
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== ERRORS
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[horizontal]
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`NNG_ENOMEM`:: Insufficient free memory exists.
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== SEE ALSO
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[.text-left]
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xref:nng_msg_alloc.3.adoc[nng_msg_alloc(3)],
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xref:nng_msg_header.3.adoc[nng_msg_header(3)],
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xref:nng_msg_header_chop.3.adoc[nng_msg_header_chop(3)],
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xref:nng_msg_header_insert.3.adoc[nng_msg_header_insert(3)],
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xref:nng_msg_header_len.3.adoc[nng_msg_header_len(3)],
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xref:nng_msg_header_trim.3.adoc[nng_msg_header_trim(3)],
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xref:nng_msg_free.3.adoc[nng_msg_free(3)],
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xref:nng_strerror.3.adoc[nng_strerror(3)],
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xref:nng.7.adoc[nng(7)]
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