Add message handling man pages.

Note that we're also no longer overriding the source formatter or
the icons for new pages, since we can supply that on the command
line in the script that generates output.

1 files changed, 65 insertions, 0 deletions

diff --git a/docs/nng_msg_header.adoc b/docs/nng_msg_header.adoc
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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].