Import lwIP contrib rep

... from http://git.savannah.gnu.org/cgit/lwip/lwip-contrib.git/ into contrib/ subdir, STABLE-2_1_0_RELEASE tag
lwIP contrib is now officially frozen
TODO: Fix build

contrib/ports/win32/example_app/default_netif.c

@@ -0,0 +1,79 @@
+/*
+ * Copyright (c) 2001-2003 Swedish Institute of Computer Science.
+ * 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.
+ * 3. The name of the author may not be used to endorse or promote products
+ *    derived from this software without specific prior written permission. 
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED 
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 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.
+ *
+ * This file is part of the lwIP TCP/IP stack.
+ * 
+ * Author: Adam Dunkels <adam@sics.se>
+ *
+ */
+
+#include "lwip/opt.h"
+
+#include "lwip/netif.h"
+#include "lwip/ip_addr.h"
+#include "lwip/tcpip.h"
+#include "../pcapif.h"
+#include "examples/example_app/default_netif.h"
+
+static struct netif netif;
+
+#if LWIP_IPV4
+#define NETIF_ADDRS ipaddr, netmask, gw,
+void init_default_netif(const ip4_addr_t *ipaddr, const ip4_addr_t *netmask, const ip4_addr_t *gw)
+#else
+#define NETIF_ADDRS
+void init_default_netif(void)
+#endif
+{
+#if NO_SYS
+  netif_add(&netif, NETIF_ADDRS NULL, pcapif_init, netif_input);
+#else  /* NO_SYS */
+  netif_add(&netif, NETIF_ADDRS NULL, pcapif_init, tcpip_input);
+#endif /* NO_SYS */
+  netif_set_default(&netif);
+}
+
+void
+default_netif_poll(void)
+{
+#if !PCAPIF_RX_USE_THREAD
+  /* check for packets and link status*/
+  pcapif_poll(&netif);
+  /* When pcapif_poll comes back, there are not packets, so sleep to
+     prevent 100% CPU load. Don't do this in an embedded system since it
+     increases latency! */
+  sys_msleep(1);
+#else /* !PCAPIF_RX_USE_THREAD */
+  sys_msleep(50);
+#endif /* !PCAPIF_RX_USE_THREAD */
+}
+
+void
+default_netif_shutdown(void)
+{
+  /* release the pcap library... */
+  pcapif_shutdown(&netif);
+}