starting to add some dhcp code

hio/lib/hio-dhcp.h

@@ -0,0 +1,66 @@
+/*
+    Copyright (c) 2016-2020 Chung, Hyung-Hwan. All rights reserved.
+
+    Redistribution and use in source and binary forms, with or without
+    modification, are permitted provided that the following conditions
+    are met:
+    1. Redistributions of source code must retain the above copyright
+       notice, this list of conditions and the following disclaimer.
+    2. Redistributions in binary form must reproduce the above copyright
+       notice, this list of conditions and the following disclaimer in the
+       documentation and/or other materials provided with the distribution.
+
+    THIS SOFTWARE IS PROVIDED BY THE AUTHOR "AS IS" AND ANY EXPRESS OR
+    IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WAfRRANTIES
+    OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+    IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
+    INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+    NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+    DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+    THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+    (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+    THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef _HIO_DHCP_H_
+#define _HIO_DHCP_H_
+
+#include <hio.h>
+#include <hio-skad.h>
+
+#define HIO_DNS_PORT (53)
+
+typedef struct hio_svc_dhcs_t hio_svc_dhcs_t; 
+
+/* ---------------------------------------------------------------- */
+
+#if defined(__cplusplus)
+extern "C" {
+#endif
+
+HIO_EXPORT hio_svc_dhcs_t* hio_svc_dhcs_start (
+	hio_t*             hio,
+	const hio_skad_t*  serv_addr, /* required */
+	const hio_skad_t*  bind_addr, /* optional. can be HIO_NULL */
+	const hio_ntime_t* send_tmout, /* required */
+	const hio_ntime_t* reply_tmout, /* required */
+	hio_oow_t          max_tries /* required */
+);
+
+HIO_EXPORT void hio_svc_dhcs_stop (
+	hio_svc_dhcs_t* dhcs
+);
+
+#if defined(HIO_HAVE_INLINE)
+static HIO_INLINE hio_t* hio_svc_dhcs_gethio(hio_svc_dhcs_t* svc) { return hio_svc_gethio((hio_svc_t*)svc); }
+#else
+#	define hio_svc_dhcs_gethio(svc) hio_svc_gethio(svc)
+
+#endif
+
+
+#if defined(__cplusplus)
+}
+#endif
+
+#endif