initial commit of lk (little kernel) project
diff --git a/lib/lwip/src/netif/loopif.c b/lib/lwip/src/netif/loopif.c
new file mode 100644
index 0000000..0464cb8
--- /dev/null
+++ b/lib/lwip/src/netif/loopif.c
@@ -0,0 +1,119 @@
+/*
+ * Copyright (c) 2001-2004 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"
+
+#if LWIP_HAVE_LOOPIF
+
+#include "netif/loopif.h"
+#include "lwip/mem.h"
+
+#if defined(LWIP_DEBUG) && defined(LWIP_TCPDUMP)
+#include "netif/tcpdump.h"
+#endif /* LWIP_DEBUG && LWIP_TCPDUMP */
+
+#include "lwip/tcp.h"
+#include "lwip/ip.h"
+
+static void
+loopif_input( void * arg )
+{
+ struct netif *netif = (struct netif *)( ((void **)arg)[ 0 ] );
+ struct pbuf *r = (struct pbuf *)( ((void **)arg)[ 1 ] );
+
+ mem_free( arg );
+ netif -> input( r, netif );
+}
+
+static err_t
+loopif_output(struct netif *netif, struct pbuf *p,
+ struct ip_addr *ipaddr)
+{
+ struct pbuf *q, *r;
+ u8_t *ptr;
+ void **arg;
+
+#if defined(LWIP_DEBUG) && defined(LWIP_TCPDUMP)
+ tcpdump(p);
+#endif /* LWIP_DEBUG && LWIP_TCPDUMP */
+
+ r = pbuf_alloc(PBUF_RAW, p->tot_len, PBUF_RAM);
+ if (r != NULL) {
+ ptr = r->payload;
+
+ for(q = p; q != NULL; q = q->next) {
+ memcpy(ptr, q->payload, q->len);
+ ptr += q->len;
+ }
+
+ arg = mem_malloc( sizeof( void *[2]));
+ if( NULL == arg ) {
+ return ERR_MEM;
+ }
+
+ arg[0] = netif;
+ arg[1] = r;
+ /**
+ * workaround (patch #1779) to try to prevent bug #2595:
+ * When connecting to "localhost" with the loopif interface,
+ * tcp_output doesn't get the opportunity to finnish sending the
+ * segment before tcp_process gets it, resulting in tcp_process
+ * referencing pcb->unacked-> which still is NULL.
+ *
+ * TODO: Is there still a race condition here? Leon
+ */
+ sys_timeout( 1, loopif_input, arg );
+
+ return ERR_OK;
+ }
+ return ERR_MEM;
+}
+
+err_t
+loopif_init(struct netif *netif)
+{
+ netif->name[0] = 'l';
+ netif->name[1] = 'o';
+#if 0 /** TODO: I think this should be enabled, or not? Leon */
+ netif->input = loopif_input;
+#endif
+ netif->output = loopif_output;
+ return ERR_OK;
+}
+
+#endif /* LWIP_HAVE_LOOPIF */
+
+
+
+
+
+
+