add unix projects to contrib module

23 years ago · edd18aad86
33 changed files with 4510 additions and 0 deletions
--- a/ports/unix/proj/lib/Makefile
+++ b/ports/unix/proj/lib/Makefile
@ -0,0 +1,92 @@
+#
+# Copyright (c) 2001, 2002 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>
+#
+
+CONTRIBDIR=../../../..
+LWIPARCH=$(CONTRIBDIR)/ports/unix
+
+#Set this to where you have the lwip core module checked out from CVS
+#default assumes it's a dir named lwip at the same level as the contrib module
+LWIPDIR=$(CONTRIBDIR)/../lwip/src
+
+
+CCDEP=gcc
+CC=gcc
+CFLAGS=-g -Wall -fPIC -DIPv4 -DLWIP_DEBUG
+
+CFLAGS:=$(CFLAGS) \
+	-I$(LWIPDIR)/include -I$(LWIPARCH)/include -I$(LWIPDIR)/include/ipv4 \
+	-Iapps -I.
+
+# COREFILES, CORE4FILES: The minimum set of files needed for lwIP.
+COREFILES=$(LWIPDIR)/core/mem.c $(LWIPDIR)/core/memp.c $(LWIPDIR)/core/netif.c \
+	$(LWIPDIR)/core/pbuf.c $(LWIPDIR)/core/stats.c $(LWIPDIR)/core/sys.c \
+        $(LWIPDIR)/core/tcp.c $(LWIPDIR)/core/tcp_in.c \
+        $(LWIPDIR)/core/tcp_out.c $(LWIPDIR)/core/udp.c 
+CORE4FILES=$(LWIPDIR)/core/ipv4/icmp.c $(LWIPDIR)/core/ipv4/ip.c \
+	$(LWIPDIR)/core/inet.c $(LWIPDIR)/core/ipv4/ip_addr.c
+
+
+# APIFILES: The files which implement the sequential and socket APIs.
+APIFILES=$(LWIPDIR)/api/api_lib.c $(LWIPDIR)/api/api_msg.c $(LWIPDIR)/api/tcpip.c \
+	$(LWIPDIR)/api/err.c $(LWIPDIR)/api/sockets.c 
+
+# NETIFFILES: Files implementing various generic network interface functions.'
+NETIFFILES=$(LWIPDIR)/netif/loopif.c \
+	$(LWIPDIR)/netif/etharp.c
+
+# ARCHFILES: Archiecture specific files.
+ARCHFILES=$(wildcard $(LWIPDIR)/arch/$(LWIPARCH)/*.c $(LWIPDIR)/arch/$(LWIPARCH)/netif/*.c)
+
+# LWIPFILES: All the above.
+LWIPFILES=$(COREFILES) $(CORE4FILES) $(APIFILES) $(NETIFFILES) $(ARCHFILES)
+LWIPFILESW=$(wildcard $(LWIPFILES))
+LWIPOBJS=$(notdir $(LWIPFILESW:.c=.o))
+
+LWIPLIB=liblwip.so
+
+%.o:
+	$(CC) $(CFLAGS) -c $(<:.o=.c)
+
+all: $(LWIPLIB) 
+.PHONY: all
+
+clean:
+	rm -f *.o $(LWIPLIB) *.s .depend* *.core core
+
+depend dep: .depend
+
+include .depend
+
+$(LWIPLIB): $(LWIPOBJS) unixlib.o
+	$(CC) -g -nostartfiles -shared -o $@ $^
+
+.depend: unixlib.c $(LWIPFILES)
+	$(CCDEP) $(CFLAGS) -MM $^ > .depend || rm -f .depend
--- a/ports/unix/proj/lib/README
+++ b/ports/unix/proj/lib/README
@ -0,0 +1,31 @@
+This directory contains an example of how to compile lwIP as a self
+initialising shared library on Linux.
+
+Some brief instructions:
+ 
+* Compile the code:
+
+ > make clean all
+
+ This should produce liblwip4unixlib.so.  This is the shared library.
+
+* Link an application against the shared library
+
+ If you're using gcc you can do this by including -llwip4unixlib in
+your link command. 
+
+* Run your application
+ 
+ Ensure that LD_LIBRARY_PATH includes the directory that contains
+liblwip4unixlib.so (ie. this directory)
+
+
+
+If you are unsure about shared libraries and libraries on linux in
+general, you might find this HOWTO useful:
+
+<http://www.tldp.org/HOWTO/Program-Library-HOWTO/>
+
+
+
+Kieran Mansley, October 2002.
--- a/ports/unix/proj/lib/lwipopts.h
+++ b/ports/unix/proj/lib/lwipopts.h
@ -0,0 +1,181 @@
+/*
+ * 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>
+ *
+ */
+#ifndef __LWIPOPTS_H__
+#define __LWIPOPTS_H__
+
+/* ---------- Memory options ---------- */
+/* MEM_ALIGNMENT: should be set to the alignment of the CPU for which
+   lwIP is compiled. 4 byte alignment -> define MEM_ALIGNMENT to 4, 2
+   byte alignment -> define MEM_ALIGNMENT to 2. */
+#define MEM_ALIGNMENT           1
+
+/* MEM_SIZE: the size of the heap memory. If the application will send
+a lot of data that needs to be copied, this should be set high. */
+#define MEM_SIZE                1600
+
+/* MEMP_NUM_PBUF: the number of memp struct pbufs. If the application
+   sends a lot of data out of ROM (or other static memory), this
+   should be set high. */
+#define MEMP_NUM_PBUF           16
+/* MEMP_NUM_UDP_PCB: the number of UDP protocol control blocks. One
+   per active UDP "connection". */
+#define MEMP_NUM_UDP_PCB        4
+/* MEMP_NUM_TCP_PCB: the number of simulatenously active TCP
+   connections. */
+#define MEMP_NUM_TCP_PCB        5
+/* MEMP_NUM_TCP_PCB_LISTEN: the number of listening TCP
+   connections. */
+#define MEMP_NUM_TCP_PCB_LISTEN 8
+/* MEMP_NUM_TCP_SEG: the number of simultaneously queued TCP
+   segments. */
+#define MEMP_NUM_TCP_SEG        16
+/* MEMP_NUM_SYS_TIMEOUT: the number of simulateously active
+   timeouts. */
+#define MEMP_NUM_SYS_TIMEOUT    3
+
+
+/* The following four are used only with the sequential API and can be
+   set to 0 if the application only will use the raw API. */
+/* MEMP_NUM_NETBUF: the number of struct netbufs. */
+#define MEMP_NUM_NETBUF         2
+/* MEMP_NUM_NETCONN: the number of struct netconns. */
+#define MEMP_NUM_NETCONN        4
+/* MEMP_NUM_APIMSG: the number of struct api_msg, used for
+   communication between the TCP/IP stack and the sequential
+   programs. */
+#define MEMP_NUM_API_MSG        8
+/* MEMP_NUM_TCPIPMSG: the number of struct tcpip_msg, which is used
+   for sequential API communication and incoming packets. Used in
+   src/api/tcpip.c. */
+#define MEMP_NUM_TCPIP_MSG      8
+
+/* These two control is reclaimer functions should be compiled
+   in. Should always be turned on (1). */
+#define MEM_RECLAIM             1
+#define MEMP_RECLAIM            1
+
+/* ---------- Pbuf options ---------- */
+/* PBUF_POOL_SIZE: the number of buffers in the pbuf pool. */
+#define PBUF_POOL_SIZE          6
+
+/* PBUF_POOL_BUFSIZE: the size of each pbuf in the pbuf pool. */
+#define PBUF_POOL_BUFSIZE       128
+
+/* PBUF_LINK_HLEN: the number of bytes that should be allocated for a
+   link level header. */
+#define PBUF_LINK_HLEN          16
+
+/* ---------- TCP options ---------- */
+#define LWIP_TCP                1
+#define TCP_TTL                 255
+
+/* Controls if TCP should queue segments that arrive out of
+   order. Define to 0 if your device is low on memory. */
+#define TCP_QUEUE_OOSEQ         1
+
+/* TCP Maximum segment size. */
+#define TCP_MSS                 128
+
+/* TCP sender buffer space (bytes). */
+#define TCP_SND_BUF             256
+
+/* TCP sender buffer space (pbufs). This must be at least = 2 *
+   TCP_SND_BUF/TCP_MSS for things to work. */
+#define TCP_SND_QUEUELEN        4 * TCP_SND_BUF/TCP_MSS
+
+/* TCP receive window. */
+#define TCP_WND                 1024
+
+/* Maximum number of retransmissions of data segments. */
+#define TCP_MAXRTX              12
+
+/* Maximum number of retransmissions of SYN segments. */
+#define TCP_SYNMAXRTX           4
+
+/* ---------- ARP options ---------- */
+#define ARP_TABLE_SIZE 10
+#define ARP_QUEUEING 1
+/**
+ * - If enabled, cache entries are generated for every kind of ARP traffic or
+ * broadcast IP traffic. This enhances behaviour for sending to a dynamic set
+ * of hosts, for example if acting as a gateway.
+ * - If disabled, cache entries are generated only for IP destination addresses
+ * in use by lwIP or applications. This enhances performance if sending to a small,
+ * reasonably static number of hosts. Typically for embedded devices.
+ */
+#define ETHARP_ALWAYS_INSERT 1
+
+/* ---------- IP options ---------- */
+/* Define IP_FORWARD to 1 if you wish to have the ability to forward
+   IP packets across network interfaces. If you are going to run lwIP
+   on a device with only one network interface, define this to 0. */
+#define IP_FORWARD              1
+
+/* If defined to 1, IP options are allowed (but not parsed). If
+   defined to 0, all packets with IP options are dropped. */
+#define IP_OPTIONS              1
+
+/* ---------- ICMP options ---------- */
+#define ICMP_TTL                255
+
+
+/* ---------- DHCP options ---------- */
+/* Define LWIP_DHCP to 1 if you want DHCP configuration of
+   interfaces. DHCP is not implemented in lwIP 0.5.1, however, so
+   turning this on does currently not work. */
+#define LWIP_DHCP               0
+
+/* 1 if you want to do an ARP check on the offered address
+   (recommended). */
+#define DHCP_DOES_ARP_CHECK     1
+
+/* ---------- UDP options ---------- */
+#define LWIP_UDP                1
+#define UDP_TTL                 255
+
+
+/* ---------- Statistics options ---------- */
+#define STATS
+
+#ifdef STATS
+#define LINK_STATS
+#define IP_STATS
+#define ICMP_STATS
+#define UDP_STATS
+#define TCP_STATS
+#define MEM_STATS
+#define MEMP_STATS
+#define PBUF_STATS
+#define SYS_STATS
+#endif /* STATS */
+
+#endif /* __LWIPOPTS_H__ */
--- a/ports/unix/proj/lib/unixlib.c
+++ b/ports/unix/proj/lib/unixlib.c
@ -0,0 +1,91 @@
+/*
+ * 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.
+ * 
+ * Author: Kieran Mansley <kjm25@cam.ac.uk>
+ *
+ * $Id: unixlib.c,v 1.1 2003/01/31 13:35:43 jani Exp $
+ */
+
+/*-----------------------------------------------------------------------------------*/
+/* unixlib.c
+ *
+ * The initialisation functions for a shared library
+ *
+ * You may need to configure this file to your own needs - it is only an example
+ * of how lwIP can be used as a self initialising shared library.
+ *
+ * In particular, you should change the gateway, ipaddr, and netmask to be the values
+ * you would like the stack to use.
+ */
+/*-----------------------------------------------------------------------------------*/
+#include "lwip/sys.h"
+#include "lwip/mem.h"
+#include "lwip/memp.h"
+#include "lwip/pbuf.h"
+#include "lwip/tcp.h"
+#include "lwip/tcpip.h"
+#include "lwip/netif.h"
+#include "lwip/stats.h"
+
+#include "netif/tapif.h"
+
+static void
+tcpip_init_done(void *arg)
+{
+  sys_sem_t *sem;
+  sem = arg;
+  sys_sem_signal(*sem);
+}
+
+void _init(void){
+  struct ip_addr ipaddr, netmask, gateway;
+  sys_sem_t sem;
+
+  stats_init();
+  sys_init();
+  mem_init();
+  memp_init();
+  pbuf_init();
+  
+  sem = sys_sem_new(0);
+  tcpip_init(tcpip_init_done, &sem);
+  sys_sem_wait(sem);
+  sys_sem_free(sem);
+  
+  netif_init();
+ /*
+    CHANGE THESE to suit your own network configuration:
+  */
+  IP4_ADDR(&gateway, 192,168,1,1);
+  IP4_ADDR(&ipaddr, 192,168,1,1);
+  IP4_ADDR(&netmask, 255,255,255,0);
+  
+  netif_set_default(netif_add(&ipaddr, &netmask, &gateway, tapif_init,
+			      tcpip_input));
+}
+
+void _fini(void){
+}
--- a/ports/unix/proj/minimal/Makefile
+++ b/ports/unix/proj/minimal/Makefile
@ -0,0 +1,96 @@
+#
+# Copyright (c) 2001, 2002 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>
+#
+ 
+CCDEP=gcc
+CC=gcc
+CFLAGS=-g -Wall -DIPv4 -Os -fpack-struct
+ARFLAGS=rs
+
+CONTRIBDIR=../../../..
+LWIPARCH=$(CONTRIBDIR)/ports/unix
+
+#Set this to where you have the lwip core module checked out from CVS
+#default assumes it's a dir named lwip at the same level as the contrib module
+LWIPDIR=$(CONTRIBDIR)/../lwip/src
+
+CFLAGS:=$(CFLAGS) \
+	-I$(LWIPDIR)/include -I$(LWIPARCH)/include -I$(LWIPDIR)/include/ipv4 \
+	-Iapps -I.
+
+# COREFILES, CORE4FILES: The minimum set of files needed for lwIP.
+COREFILES=$(LWIPDIR)/core/mem.c $(LWIPDIR)/core/memp.c $(LWIPDIR)/core/netif.c \
+	$(LWIPDIR)/core/pbuf.c $(LWIPDIR)/core/stats.c $(LWIPDIR)/core/sys.c \
+        $(LWIPDIR)/core/tcp.c $(LWIPDIR)/core/tcp_in.c \
+        $(LWIPDIR)/core/tcp_out.c $(LWIPDIR)/core/udp.c 
+CORE4FILES=$(LWIPDIR)/core/ipv4/icmp.c $(LWIPDIR)/core/ipv4/ip.c \
+	$(LWIPDIR)/core/inet.c $(LWIPDIR)/core/ipv4/ip_addr.c
+
+# NETIFFILES: Files implementing various generic network interface functions.'
+NETIFFILES=$(LWIPDIR)/netif/etharp.c mintapif.c
+
+# LWIPFILES: All the above.
+LWIPFILES=$(COREFILES) $(CORE4FILES) $(NETIFFILES)
+LWIPFILESW=$(wildcard $(LWIPFILES))
+LWIPOBJS=$(notdir $(LWIPFILESW:.c=.o))
+
+# APPFILES
+APPFILES=echo.c 
+
+LWIPLIB=liblwip4.a
+APPLIB=liblwipapps.a
+APPOBJS=$(notdir $(APPFILES:.c=.o))
+
+%.o:
+	$(CC) $(CFLAGS) -c $(<:.o=.c)
+
+all ipv4 compile: minimal
+.PHONY: all
+
+clean:
+	rm -f *.o $(LWIPLIB) $(APPLIB) minimal .depend* *.core core
+
+depend dep: .depend
+
+include .depend
+
+$(APPLIB): $(APPOBJS)
+	$(AR) $(ARFLAGS) $(APPLIB) $?
+
+$(LWIPLIB): $(LWIPOBJS)
+	$(AR) $(ARFLAGS) $(LWIPLIB) $?
+
+.depend: main.c $(LWIPFILES) $(APPFILES)
+	$(CCDEP) $(CFLAGS) -MM $^ > .depend || rm -f .depend
+
+minimal: .depend $(LWIPLIB) $(APPLIB) main.o $(APPFILES)
+	$(CC) $(CFLAGS) $(LDFLAGS) -o minimal main.o $(APPLIB) $(LWIPLIB)
+
+
--- a/ports/unix/proj/minimal/README
+++ b/ports/unix/proj/minimal/README
@ -0,0 +1,3 @@
+This is an example of a very minimal lwIP project. It runs in a single
+thread and runs a single example application - an echo server. The
+echo application is implemented using the raw API.
--- a/ports/unix/proj/minimal/echo.c
+++ b/ports/unix/proj/minimal/echo.c
@ -0,0 +1,220 @@
+/*
+ * 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/debug.h"
+#include "lwip/stats.h"
+#include "lwip/tcp.h"
+
+struct echo_state {
+  struct pbuf *p;
+  u8_t failed;
+#define FAILED_MAX 8
+};
+/*-----------------------------------------------------------------------------------*/
+static void
+echo_err(void *arg, err_t err)
+{
+  struct echo_state *es = arg;
+
+  if(arg != NULL) {
+    pbuf_free(es->p);
+    mem_free(arg);
+  }
+}
+/*-----------------------------------------------------------------------------------*/
+static void
+close_conn(struct tcp_pcb *pcb, struct echo_state *es)
+{
+  tcp_arg(pcb, NULL);
+#if 0
+  tcp_sent(pcb, NULL);  
+  tcp_recv(pcb, NULL);
+#endif /* 0 */
+  if(es != NULL) {
+    pbuf_free(es->p);
+    mem_free(es);
+  }
+  tcp_close(pcb);
+}
+/*-----------------------------------------------------------------------------------*/
+static void
+send_buf(struct tcp_pcb *pcb, struct echo_state *es)
+{
+  struct pbuf *q;
+  
+  do {
+    q = es->p;
+    es->p = pbuf_dechain(q);
+    if(tcp_write(pcb, q->payload, q->len, 1) == ERR_MEM) {
+      pbuf_chain(q, es->p);
+      es->p = q;
+      return;
+    }
+    tcp_recved(pcb, q->len);
+    pbuf_free(q);
+  } while(es->p != NULL);   
+}
+/*-----------------------------------------------------------------------------------*/
+static err_t
+echo_poll(void *arg, struct tcp_pcb *pcb)
+{
+  struct echo_state *es;
+
+  if(arg == NULL) {
+    return tcp_close(pcb);
+  }
+  
+  es = arg;
+
+  if(es->failed >= FAILED_MAX) {
+    close_conn(pcb, es);
+    tcp_abort(pcb);
+    return ERR_ABRT;
+  }
+  
+  if(es->p != NULL) {
+    ++es->failed;
+    send_buf(pcb, es);
+  }
+  return ERR_OK;
+}
+/*-----------------------------------------------------------------------------------*/
+static err_t
+echo_sent(void *arg, struct tcp_pcb *pcb, u16_t len)
+{
+  struct echo_state *es;
+  
+  es = arg;
+
+  if(es != NULL && es->p != NULL) {
+    send_buf(pcb, es);
+  }
+  return ERR_OK;
+}
+/*-----------------------------------------------------------------------------------*/
+static err_t
+echo_recv(void *arg, struct tcp_pcb *pcb, struct pbuf *p, err_t err)
+{
+  struct echo_state *es;
+  
+  es = arg;
+
+  if(p == NULL) {
+    close_conn(pcb, es);
+    return ERR_OK;
+  }
+  
+  if(es->p != NULL) {
+    pbuf_chain(es->p, p);
+  } else {
+    es->p = p;
+  }
+
+  send_buf(pcb, es);
+  
+  return ERR_OK;
+}
+/*-----------------------------------------------------------------------------------*/
+static err_t
+echo_accept(void *arg, struct tcp_pcb *pcb, err_t err)
+{
+  struct echo_state *es;
+
+  tcp_setprio(pcb, TCP_PRIO_MIN);
+  
+  /* Allocate memory for the structure that holds the state of the
+     connection. */
+  es = mem_malloc(sizeof(struct echo_state));
+
+  if(es == NULL) {
+    return ERR_MEM;
+  }
+  
+  /* Initialize the structure. */
+  es->p = NULL;
+  es->failed = 0;
+
+  /* Tell TCP that this is the structure we wish to be passed for our
+     callbacks. */
+  tcp_arg(pcb, es);
+
+  /* Tell TCP that we wish to be informed of incoming data by a call
+     to the http_recv() function. */
+#if 0
+  tcp_recv(pcb, echo_recv);
+  
+  tcp_err(pcb, echo_err);
+#endif  /* 0 */
+  
+  tcp_poll(pcb, echo_poll, 2);
+
+  return ERR_OK;
+}
+/*-----------------------------------------------------------------------------------*/
+void
+echo_init(void)
+{
+  struct tcp_pcb *pcb;
+
+  pcb = tcp_new();
+  tcp_bind(pcb, IP_ADDR_ANY, 7);
+  pcb = tcp_listen(pcb);
+#if 0
+  tcp_accept(pcb, echo_accept);
+#endif /* 0 */
+}
+/*-----------------------------------------------------------------------------------*/
+err_t
+lwip_tcp_event(void *arg, struct tcp_pcb *pcb,
+	       enum lwip_event ev, struct pbuf *p,
+	       u16_t size, err_t err)
+{
+  switch(ev) {
+  case LWIP_EVENT_ACCEPT:
+    return echo_accept(arg, pcb, err);
+  case LWIP_EVENT_SENT:
+    return echo_sent(arg, pcb, size);
+  case LWIP_EVENT_RECV:
+    return echo_recv(arg, pcb, p, err);
+  case LWIP_EVENT_ERR:
+    echo_err(arg, err);
+    break;
+  case LWIP_EVENT_POLL:
+    return echo_poll(arg, pcb);
+  default:
+    break;
+  }
+  
+  return ERR_OK;
+}
+/*-----------------------------------------------------------------------------------*/
+
--- a/ports/unix/proj/minimal/lwipopts.h
+++ b/ports/unix/proj/minimal/lwipopts.h
@ -0,0 +1,178 @@
+/*
+ * 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>
+ *
+ */
+#ifndef __LWIPOPTS_H__
+#define __LWIPOPTS_H__
+
+#define NO_SYS 1
+#define LWIP_EVENT_API 1
+
+/* ---------- Memory options ---------- */
+/* MEM_ALIGNMENT: should be set to the alignment of the CPU for which
+   lwIP is compiled. 4 byte alignment -> define MEM_ALIGNMENT to 4, 2
+   byte alignment -> define MEM_ALIGNMENT to 2. */
+#define MEM_ALIGNMENT           2
+
+/* MEM_SIZE: the size of the heap memory. If the application will send
+a lot of data that needs to be copied, this should be set high. */
+#define MEM_SIZE                1000
+
+/* MEMP_NUM_PBUF: the number of memp struct pbufs. If the application
+   sends a lot of data out of ROM (or other static memory), this
+   should be set high. */
+#define MEMP_NUM_PBUF           8
+/* MEMP_NUM_UDP_PCB: the number of UDP protocol control blocks. One
+   per active UDP "connection". */
+#define MEMP_NUM_UDP_PCB        4
+/* MEMP_NUM_TCP_PCB: the number of simulatenously active TCP
+   connections. */
+#define MEMP_NUM_TCP_PCB        2
+/* MEMP_NUM_TCP_PCB_LISTEN: the number of listening TCP
+   connections. */
+#define MEMP_NUM_TCP_PCB_LISTEN 8
+/* MEMP_NUM_TCP_SEG: the number of simultaneously queued TCP
+   segments. */
+#define MEMP_NUM_TCP_SEG        8
+
+/* The following four are used only with the sequential API and can be
+   set to 0 if the application only will use the raw API. */
+/* MEMP_NUM_NETBUF: the number of struct netbufs. */
+#define MEMP_NUM_NETBUF         0
+/* MEMP_NUM_NETCONN: the number of struct netconns. */
+#define MEMP_NUM_NETCONN        0
+/* MEMP_NUM_APIMSG: the number of struct api_msg, used for
+   communication between the TCP/IP stack and the sequential
+   programs. */
+#define MEMP_NUM_API_MSG        0
+/* MEMP_NUM_TCPIPMSG: the number of struct tcpip_msg, which is used
+   for sequential API communication and incoming packets. Used in
+   src/api/tcpip.c. */
+#define MEMP_NUM_TCPIP_MSG      0
+/* MEMP_NUM_SYS_TIMEOUT: the number of simulateously active
+   timeouts. */
+#define MEMP_NUM_SYS_TIMEOUT    0
+
+/* ---------- Pbuf options ---------- */
+/* PBUF_POOL_SIZE: the number of buffers in the pbuf pool. */
+#define PBUF_POOL_SIZE          8
+
+/* PBUF_POOL_BUFSIZE: the size of each pbuf in the pbuf pool. */
+#define PBUF_POOL_BUFSIZE       128
+
+/* PBUF_LINK_HLEN: the number of bytes that should be allocated for a
+   link level header. */
+#define PBUF_LINK_HLEN          16
+
+/* ---------- TCP options ---------- */
+#define LWIP_TCP                1
+#define TCP_TTL                 255
+
+/* Controls if TCP should queue segments that arrive out of
+   order. Define to 0 if your device is low on memory. */
+#define TCP_QUEUE_OOSEQ         0
+
+/* TCP Maximum segment size. */
+#define TCP_MSS                 128
+
+/* TCP sender buffer space (bytes). */
+#define TCP_SND_BUF             256
+
+/* TCP sender buffer space (pbufs). This must be at least = 2 *
+   TCP_SND_BUF/TCP_MSS for things to work. */
+#define TCP_SND_QUEUELEN        4 * TCP_SND_BUF/TCP_MSS
+
+/* TCP receive window. */
+#define TCP_WND                 512
+
+/* Maximum number of retransmissions of data segments. */
+#define TCP_MAXRTX              12
+
+/* Maximum number of retransmissions of SYN segments. */
+#define TCP_SYNMAXRTX           4
+
+/* ---------- ARP options ---------- */
+#define ARP_TABLE_SIZE 10
+#define ARP_QUEUEING 0
+/**
+ * - If enabled, cache entries are generated for every kind of ARP traffic or
+ * broadcast IP traffic. This enhances behaviour for sending to a dynamic set
+ * of hosts, for example if acting as a gateway.
+ * - If disabled, cache entries are generated only for IP destination addresses
+ * in use by lwIP or applications. This enhances performance if sending to a small,
+ * reasonably static number of hosts. Typically for embedded devices.
+ */
+#define ETHARP_ALWAYS_INSERT 0
+
+/* ---------- IP options ---------- */
+/* Define IP_FORWARD to 1 if you wish to have the ability to forward
+   IP packets across network interfaces. If you are going to run lwIP
+   on a device with only one network interface, define this to 0. */
+#define IP_FORWARD              0
+
+/* If defined to 1, IP options are allowed (but not parsed). If
+   defined to 0, all packets with IP options are dropped. */
+#define IP_OPTIONS              1
+
+/* ---------- ICMP options ---------- */
+#define ICMP_TTL                255
+
+
+/* ---------- DHCP options ---------- */
+/* Define LWIP_DHCP to 1 if you want DHCP configuration of
+   interfaces. DHCP is not implemented in lwIP 0.5.1, however, so
+   turning this on does currently not work. */
+#define LWIP_DHCP               0
+
+/* 1 if you want to do an ARP check on the offered address
+   (recommended). */
+#define DHCP_DOES_ARP_CHECK     1
+
+/* ---------- UDP options ---------- */
+#define LWIP_UDP                0
+#define UDP_TTL                 255
+
+
+/* ---------- Statistics options ---------- */
+/*#define STATS*/
+
+#ifdef STATS
+#define LINK_STATS
+#define IP_STATS
+#define ICMP_STATS
+#define UDP_STATS
+#define TCP_STATS
+#define MEM_STATS
+#define MEMP_STATS
+#define PBUF_STATS
+#define SYS_STATS
+#endif /* STATS */
+
+#endif /* __LWIPOPTS_H__ */
--- a/ports/unix/proj/minimal/main.c
+++ b/ports/unix/proj/minimal/main.c
@ -0,0 +1,101 @@
+/*
+ * 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/debug.h"
+
+#include "lwip/mem.h"
+#include "lwip/memp.h"
+#include "lwip/sys.h"
+
+#include "lwip/stats.h"
+
+#include "lwip/ip.h"
+#include "lwip/udp.h"
+#include "lwip/tcp.h"
+
+#include "mintapif.h"
+
+/*-----------------------------------------------------------------------------------*/
+int
+main(int argc, char **argv)
+{
+  struct ip_addr ipaddr, netmask, gw;
+  struct netif *netif;
+  
+#ifdef PERF
+  perf_init("/tmp/minimal.perf");
+#endif /* PERF */
+#ifdef STATS
+  stats_init();
+#endif /* STATS */
+
+  mem_init();
+  memp_init();
+  pbuf_init(); 
+  netif_init();
+  ip_init();
+  udp_init();
+  tcp_init();
+  printf("TCP/IP initialized.\n");
+  
+  IP4_ADDR(&gw, 192,168,0,1);
+  IP4_ADDR(&ipaddr, 192,168,0,2);
+  IP4_ADDR(&netmask, 255,255,255,0);
+
+  netif = netif_add(&ipaddr, &netmask, &gw, mintapif_init, ip_input);
+  
+  netif_set_default(netif);
+
+  echo_init();
+  
+  printf("Applications started.\n");
+    
+
+  while(1) {
+    
+    if(mintapif_wait(netif, 100) == MINTAPIF_TIMEOUT) {
+      tcp_tmr();
+    }
+    
+  }
+  
+  return 0;
+}
+/*-----------------------------------------------------------------------------------*/
+
+
+
+
+
+
+
+
--- a/ports/unix/proj/minimal/mintapif.c
+++ b/ports/unix/proj/minimal/mintapif.c
@ -0,0 +1,354 @@
+/*-----------------------------------------------------------------------------------*/
+/*
+ * 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 <fcntl.h>
+#include <stdlib.h>
+#include <stdio.h>
+#include <unistd.h>
+#include <string.h>
+#include <sys/ioctl.h>
+#include <sys/socket.h>
+#include <sys/types.h>
+#include <sys/time.h>
+#include <sys/uio.h>
+#include <sys/socket.h>
+
+#ifdef linux
+#include <sys/ioctl.h>
+#include <linux/if.h>
+#include <linux/if_tun.h>
+#define DEVTAP "/dev/net/tun"
+#else  /* linux */
+#define DEVTAP "/dev/tap0"
+#endif /* linux */
+
+#include "lwip/stats.h"
+#include "lwip/mem.h"
+#include "netif/etharp.h"
+
+#include "mintapif.h"
+
+/* Define those to better describe your network interface. */
+#define IFNAME0 'e'
+#define IFNAME1 't'
+
+struct mintapif {
+  struct eth_addr *ethaddr;
+  /* Add whatever per-interface state that is needed here. */
+  u32_t lasttime;
+  int fd;
+};
+
+static const struct eth_addr ethbroadcast = {{0xff,0xff,0xff,0xff,0xff,0xff}};
+
+/* Forward declarations. */
+static void  mintapif_input(struct netif *netif);
+static err_t mintapif_output(struct netif *netif, struct pbuf *p,
+			       struct ip_addr *ipaddr);
+
+/*-----------------------------------------------------------------------------------*/
+static void
+low_level_init(struct netif *netif)
+{
+  struct mintapif *mintapif;
+  char buf[1024];
+
+  mintapif = netif->state;
+  
+  /* Obtain MAC address from network interface. */
+  mintapif->ethaddr->addr[0] = 1;
+  mintapif->ethaddr->addr[1] = 2;
+  mintapif->ethaddr->addr[2] = 3;
+  mintapif->ethaddr->addr[3] = 4;
+  mintapif->ethaddr->addr[4] = 5;
+  mintapif->ethaddr->addr[5] = 6;
+
+  /* Do whatever else is needed to initialize interface. */  
+  
+  mintapif->fd = open(DEVTAP, O_RDWR);
+  if(mintapif->fd == -1) {
+    perror("tapif: tapif_init: open");
+    exit(1);
+  }
+
+#ifdef linux
+  {
+    struct ifreq ifr;
+    memset(&ifr, 0, sizeof(ifr));
+    ifr.ifr_flags = IFF_TAP|IFF_NO_PI;
+    if (ioctl(mintapif->fd, TUNSETIFF, (void *) &ifr) < 0) {
+      perror(buf);
+      exit(1);
+    }
+  }
+#endif /* Linux */
+
+  snprintf(buf, sizeof(buf), "ifconfig tap0 inet %d.%d.%d.%d",
+           ip4_addr1(&(netif->gw)),
+           ip4_addr2(&(netif->gw)),
+           ip4_addr3(&(netif->gw)),
+           ip4_addr4(&(netif->gw)));
+  
+  system(buf);
+
+  mintapif->lasttime = 0;
+
+}
+/*-----------------------------------------------------------------------------------*/
+/*
+ * low_level_output():
+ *
+ * Should do the actual transmission of the packet. The packet is
+ * contained in the pbuf that is passed to the function. This pbuf
+ * might be chained.
+ *
+ */
+/*-----------------------------------------------------------------------------------*/
+
+static err_t
+low_level_output(struct netif *netif, struct pbuf *p)
+{
+  struct mintapif *mintapif;
+  struct pbuf *q;
+  char buf[1500];
+  char *bufptr;
+
+  mintapif = netif->state;
+  
+  /* initiate transfer(); */
+  
+  bufptr = &buf[0];
+  
+  for(q = p; q != NULL; q = q->next) {
+    /* Send the data from the pbuf to the interface, one pbuf at a
+       time. The size of the data in each pbuf is kept in the ->len
+       variable. */    
+    /* send data from(q->payload, q->len); */
+    memcpy(bufptr, q->payload, q->len);
+    bufptr += q->len;
+  }
+
+  /* signal that packet should be sent(); */
+  if(write(mintapif->fd, buf, p->tot_len) == -1) {
+    perror("tapif: write");
+  }
+  return ERR_OK;
+}
+/*-----------------------------------------------------------------------------------*/
+/*
+ * low_level_input():
+ *
+ * Should allocate a pbuf and transfer the bytes of the incoming
+ * packet from the interface into the pbuf.
+ *
+ */
+/*-----------------------------------------------------------------------------------*/
+static struct pbuf *
+low_level_input(struct mintapif *mintapif)
+{
+  struct pbuf *p, *q;
+  u16_t len;
+  char buf[1500];
+  char *bufptr;
+
+  /* Obtain the size of the packet and put it into the "len"
+     variable. */
+  len = read(mintapif->fd, buf, sizeof(buf));
+
+  /*  if(((double)rand()/(double)RAND_MAX) < 0.1) {
+    printf("drop\n");
+    return NULL;
+    }*/
+
+  
+  /* We allocate a pbuf chain of pbufs from the pool. */
+  p = pbuf_alloc(PBUF_LINK, len, PBUF_POOL);
+  
+  if(p != NULL) {
+    /* We iterate over the pbuf chain until we have read the entire
+       packet into the pbuf. */
+    bufptr = &buf[0];
+    for(q = p; q != NULL; q = q->next) {
+      /* Read enough bytes to fill this pbuf in the chain. The
+         avaliable data in the pbuf is given by the q->len
+         variable. */
+      /* read data into(q->payload, q->len); */
+      memcpy(q->payload, bufptr, q->len);
+      bufptr += q->len;
+    }
+    /* acknowledge that packet has been read(); */
+  } else {
+    /* drop packet(); */
+    printf("Could not allocate pbufs\n");
+  }
+
+  return p;  
+}
+/*-----------------------------------------------------------------------------------*/
+/*
+ * mintapif_output():
+ *
+ * This function is called by the TCP/IP stack when an IP packet
+ * should be sent. It calls the function called low_level_output() to
+ * do the actuall transmission of the packet.
+ *
+ */
+/*-----------------------------------------------------------------------------------*/
+static err_t
+mintapif_output(struct netif *netif, struct pbuf *p,
+		  struct ip_addr *ipaddr)
+{
+  p = etharp_output(netif, ipaddr, p);
+  if(p != NULL) {
+    return low_level_output(netif, p);
+  }
+  return ERR_OK;
+}
+/*-----------------------------------------------------------------------------------*/
+/*
+ * mintapif_input():
+ *
+ * This function should be called when a packet is ready to be read
+ * from the interface. It uses the function low_level_input() that
+ * should handle the actual reception of bytes from the network
+ * interface.
+ *
+ */
+/*-----------------------------------------------------------------------------------*/
+static void
+mintapif_input(struct netif *netif)
+{
+  struct mintapif *mintapif;
+  struct eth_hdr *ethhdr;
+  struct pbuf *p, *q;
+
+
+  mintapif = netif->state;
+  
+  p = low_level_input(mintapif);
+
+  if(p != NULL) {
+
+#ifdef LINK_STATS
+    lwip_stats.link.recv++;
+#endif /* LINK_STATS */
+
+    ethhdr = p->payload;
+
+    q = NULL;
+    switch(htons(ethhdr->type)) {
+    case ETHTYPE_IP:
+      q = etharp_ip_input(netif, p);
+      pbuf_header(p, -14);
+      netif->input(p, netif);
+      break;
+    case ETHTYPE_ARP:
+      q = etharp_arp_input(netif, mintapif->ethaddr, p);
+      break;
+    default:
+      pbuf_free(p);
+      break;
+    }
+    if(q != NULL) {
+      low_level_output(netif, q);
+      pbuf_free(q);
+    }
+
+  }
+}
+/*-----------------------------------------------------------------------------------*/
+/*
+ * mintapif_init():
+ *
+ * Should be called at the beginning of the program to set up the
+ * network interface. It calls the function low_level_init() to do the
+ * actual setup of the hardware.
+ *
+ */
+/*-----------------------------------------------------------------------------------*/
+void
+mintapif_init(struct netif *netif)
+{
+  struct mintapif *mintapif;
+    
+  mintapif = mem_malloc(sizeof(struct mintapif));
+  netif->state = mintapif;
+  netif->name[0] = IFNAME0;
+  netif->name[1] = IFNAME1;
+  netif->output = mintapif_output;
+  netif->linkoutput = low_level_output;
+  
+  mintapif->ethaddr = (struct eth_addr *)&(netif->hwaddr[0]);
+  
+  low_level_init(netif);
+}
+/*-----------------------------------------------------------------------------------*/
+enum mintapif_signal
+mintapif_wait(struct netif *netif, u16_t time)
+{
+  fd_set fdset;
+  struct timeval tv, now;
+  struct timezone tz;
+  int ret;
+  struct mintapif *mintapif;
+
+  mintapif = netif->state;
+
+  while(1) {
+  
+    if(mintapif->lasttime >= (u32_t)time * 1000) {
+      mintapif->lasttime = 0;
+      return MINTAPIF_TIMEOUT;
+    }
+    
+    tv.tv_sec = 0;
+    tv.tv_usec = (u32_t)time * 1000 - mintapif->lasttime;
+    
+    
+    FD_ZERO(&fdset);
+    FD_SET(mintapif->fd, &fdset);
+    
+    gettimeofday(&now, &tz);
+    ret = select(mintapif->fd + 1, &fdset, NULL, NULL, &tv);
+    if(ret == 0) {
+      mintapif->lasttime = 0;    
+      return MINTAPIF_TIMEOUT;
+    } 
+    gettimeofday(&tv, &tz);
+    mintapif->lasttime += (tv.tv_sec - now.tv_sec) * 1000000 + (tv.tv_usec - now.tv_usec);
+
+    mintapif_input(netif);
+  }
+  
+  return MINTAPIF_PACKET;
+}
--- a/ports/unix/proj/minimal/mintapif.h
+++ b/ports/unix/proj/minimal/mintapif.h
@ -0,0 +1,45 @@
+/*
+ * 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>
+ *
+ */
+#ifndef __MINTAPIF_H__
+#define __MINTAPIF_H__
+
+#include "lwip/netif.h"
+
+enum mintapif_signal {
+  MINTAPIF_TIMEOUT,
+  MINTAPIF_PACKET
+};
+
+void mintapif_init(struct netif *netif);
+enum mintapif_signal mintapif_wait(struct netif *netif, u16_t time);
+
+#endif /* __MINTAPIF_H__ */
--- a/ports/unix/proj/unixsim/Makefile
+++ b/ports/unix/proj/unixsim/Makefile
@ -0,0 +1,111 @@
+#
+# Copyright (c) 2001, 2002 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>
+#
+
+CCDEP=gcc
+CC=gcc
+CFLAGS=-g -Wall -DIPv4 -DLWIP_DEBUG -pedantic
+LDFLAGS=-lpcap
+CONTRIBDIR=../../../..
+LWIPARCH=$(CONTRIBDIR)/ports/unix
+ARFLAGS=rs
+
+#Set this to where you have the lwip core module checked out from CVS
+#default assumes it's a dir named lwip at the same level as the contrib module
+LWIPDIR=$(CONTRIBDIR)/../lwip/src
+
+CFLAGS:=$(CFLAGS) \
+	-I$(LWIPDIR)/include -I$(LWIPARCH)/include -I$(LWIPDIR)/include/ipv4 \
+	-Iapps -I.
+
+# COREFILES, CORE4FILES: The minimum set of files needed for lwIP.
+COREFILES=$(LWIPDIR)/core/mem.c $(LWIPDIR)/core/memp.c $(LWIPDIR)/core/netif.c \
+	$(LWIPDIR)/core/pbuf.c $(LWIPDIR)/core/stats.c $(LWIPDIR)/core/sys.c \
+        $(LWIPDIR)/core/tcp.c $(LWIPDIR)/core/tcp_in.c \
+        $(LWIPDIR)/core/tcp_out.c $(LWIPDIR)/core/udp.c 
+CORE4FILES=$(wildcard $(LWIPDIR)/core/ipv4/*.c) $(LWIPDIR)/core/inet.c
+
+
+# APIFILES: The files which implement the sequential and socket APIs.
+APIFILES=$(LWIPDIR)/api/api_lib.c $(LWIPDIR)/api/api_msg.c $(LWIPDIR)/api/tcpip.c \
+	$(LWIPDIR)/api/err.c $(LWIPDIR)/api/sockets.c 
+
+# NETIFFILES: Files implementing various generic network interface functions.'
+NETIFFILES=$(LWIPDIR)/netif/loopif.c \
+	$(LWIPDIR)/netif/etharp.c $(LWIPDIR)/netif/slipif.c 
+
+# ARCHFILES: Archiecture specific files.
+ARCHFILES=$(wildcard $(LWIPARCH)/*.c $(LWIPARCH)/netif/*.c)
+
+# APPFILES: Applications.
+APPFILES=apps/fs.c apps/httpd.c \
+	apps/udpecho.c apps/tcpecho.c \
+	apps/shell.c 
+
+# LWIPFILES: All the above.
+LWIPFILES=$(COREFILES) $(CORE4FILES) $(APIFILES) $(NETIFFILES) $(ARCHFILES)
+LWIPFILESW=$(wildcard $(LWIPFILES))
+LWIPOBJS=$(notdir $(LWIPFILESW:.c=.o))
+
+LWIPLIB=liblwip4.a
+APPLIB=liblwipapps.a
+APPOBJS=$(notdir $(APPFILES:.c=.o))
+
+%.o:
+	$(CC) $(CFLAGS) -c $(<:.o=.c)
+
+all ipv4 compile: simhost 
+.PHONY: all
+
+clean:
+	rm -f *.o $(LWIPLIB) $(APPLIB) simhost simnode simrouter *.s .depend* *.core core
+
+depend dep: .depend
+
+include .depend
+
+$(APPLIB): $(APPOBJS)
+	$(AR) $(ARFLAGS) $(APPLIB) $?
+
+$(LWIPLIB): $(LWIPOBJS)
+	$(AR) $(ARFLAGS) $(LWIPLIB) $?
+
+.depend: simhost.c simnode.c simrouter.c $(LWIPFILES) $(APPFILES)
+	$(CCDEP) $(CFLAGS) -MM $^ > .depend || rm -f .depend
+
+simhost: .depend $(LWIPLIB) $(APPLIB) simhost.o $(APPFILES)
+	$(CC) $(CFLAGS) $(LDFLAGS) -pthread -o simhost simhost.o $(APPLIB) $(LWIPLIB)
+
+simrouter: .depend $(LWIPLIB) $(APPLIB) simrouter.o
+	$(CC) $(CFLAGS) $(LDFLAGS) -pthread -o simrouter simrouter.o $(APPLIB) $(LWIPLIB) 
+
+simnode: .depend $(LWIPLIB) $(APPLIB) simnode.o 
+	$(CC) $(CFLAGS) $(LDFLAGS) -pthread -o simnode simnode.o $(APPLIB) $(LWIPLIB)
+
--- a/ports/unix/proj/unixsim/README
+++ b/ports/unix/proj/unixsim/README
@ -0,0 +1,47 @@
+This directory contains an example of how a project using lwIP might
+look. It is also the development platform of lwIP, since it can be run
+as a user process under FreeBSD or Linux. There are also a number of
+example applications (including a simple web server) in the apps/
+directory.
+
+Some short instructions on how to build and run lwIP on a FreeBSD or
+Linux host. For FreeBSD, the tap interface must be enabled in the
+kernel configuration and the kernel must be recompiled. The tap
+interface is enabled by adding the line "pseudo-device tap" in the
+kernel configuration. See Chapter 9 in the FreeBSD handbook for
+instructions on how to build a custom FreeBSD kernel.
+
+* Compile the code. This must be done by using GNU Make. Under
+  FreeBSD, GNU Make can be found in the ports collection under
+  /usr/ports/devel/gmake (type "make install distclean" to
+  install). Under Linux, GNU Make is the default "make".
+
+  > gmake         (FreeBSD)
+
+  > make          (Linux)
+
+* The compilation process produces the executable file "simhost". To
+  run this, you have to be root.
+
+  > su            (Type password for the root account)
+  # ./simhost
+
+* The lwIP TCP/IP stack is now running with IP address
+  192.168.0.2. Some things that you can try:
+
+  To see the packets that are going to and from the lwIP stack, run
+  tcpdump:
+
+  # tcpdump -l -n -i tap0
+
+  You can ping lwIP:
+
+  > ping 192.168.0.2
+
+  For a telnet shell, run:
+
+  > telnet 192.168.0.2
+  
+  Finally, "simhost" also includes a simple web server; the URL is
+  of course http://192.168.0.2/.
+
--- a/ports/unix/proj/unixsim/apps/fs.c
+++ b/ports/unix/proj/unixsim/apps/fs.c
@ -0,0 +1,57 @@
+/*
+ * 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/def.h"
+#include "fs.h"
+#include "fsdata.h"
+#include "fsdata.c"
+
+/*-----------------------------------------------------------------------------------*/
+
+
+/*-----------------------------------------------------------------------------------*/
+int
+fs_open(char *name, struct fs_file *file)
+{
+  struct fsdata_file_noconst *f;
+
+  for(f = (struct fsdata_file_noconst *)FS_ROOT;
+      f != NULL;
+      f = (struct fsdata_file_noconst *)f->next) {
+    if(!strcmp(name, (char *)f->name)) {
+      file->data = (char *)f->data;
+      file->len = f->len;
+      return 1;
+    }
+  }
+  return 0;
+}
+/*-----------------------------------------------------------------------------------*/
--- a/ports/unix/proj/unixsim/apps/fs.h
+++ b/ports/unix/proj/unixsim/apps/fs.h
@ -0,0 +1,44 @@
+/*
+ * 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>
+ *
+ */
+#ifndef __FS_H__
+#define __FS_H__
+
+struct fs_file {
+  char *data;
+  int len;
+};
+
+/* file must be allocated by caller and will be filled in
+   by the function. */
+int fs_open(char *name, struct fs_file *file);
+
+#endif /* __FS_H__ */
--- a/ports/unix/proj/unixsim/apps/fs/404.html
+++ b/ports/unix/proj/unixsim/apps/fs/404.html
@ -0,0 +1,21 @@
+<html>
+<head><title>lwIP - A Lightweight TCP/IP Stack</title></head>
+<body bgcolor="white" text="black">
+
+    <table width="100%">
+      <tr valign="top"><td width="80">	  
+	  <a href="http://www.sics.se/"><img src="img/sics.gif"
+	  border="0" alt="SICS logo" title="SICS logo"></a>
+	</td><td width="500">	  
+	  <h1>lwIP - A Lightweight TCP/IP Stack</h1>
+	  <h2>404 - Page not found</h2>
+	  <p>
+	    Sorry, the page you are requesting was not found on this
+	    server. 
+	  </p>
+	</td><td>
+	  &nbsp;
+	</td></tr>
+      </table>
+</body>
+</html>
--- a/ports/unix/proj/unixsim/apps/fs/img/sics.gif
+++ b/ports/unix/proj/unixsim/apps/fs/img/sics.gif
--- a/ports/unix/proj/unixsim/apps/fs/index.html
+++ b/ports/unix/proj/unixsim/apps/fs/index.html
@ -0,0 +1,44 @@
+<html>
+<head><title>lwIP - A Lightweight TCP/IP Stack</title></head>
+<body bgcolor="white" text="black">
+
+    <table width="100%">
+      <tr valign="top"><td width="80">	  
+	  <a href="http://www.sics.se/"><img src="img/sics.gif"
+	  border="0" alt="SICS logo" title="SICS logo"></a>
+	</td><td width="500">	  
+	  <h1>lwIP - A Lightweight TCP/IP Stack</h1>
+	  <p>
+	    The web page you are watching was served by a simple web
+	    server running on top of the lightweight TCP/IP stack <a
+	    href="http://www.sics.se/~adam/lwip/">lwIP</a>.
+	  </p>
+	  <p>
+	    lwIP is an open source implementation of the TCP/IP
+	    protocol suite that was originally written by Adam Dunkels
+	    of the Swedish Institute of Computer Science but now is
+	    being actively developed by a team of developers
+	    distributed world-wide. Since it's release, lwIP has
+	    spurred a lot of interest and has been ported to several
+	    platforms and operating systems. lwIP can be used either
+	    with or without an underlying OS.
+	  </p>
+	  <p>
+	    The focus of the lwIP TCP/IP implementation is to reduce
+	    the RAM usage while still having a full scale TCP. This
+	    makes lwIP suitable for use in embedded systems with tens
+	    of kilobytes of free RAM and room for around 40 kilobytes
+	    of code ROM.
+	  </p>
+	  <p>
+	    More information about lwIP can be found at the lwIP
+	    homepage at <a
+	    href="http://www.sics.se/~adam/lwip/">http://www.sics.se/~adam/lwip/</a>.
+	  </p>
+	</td><td>
+	  &nbsp;
+	</td></tr>
+      </table>
+</body>
+</html>
+
--- a/ports/unix/proj/unixsim/apps/fsdata.c
+++ b/ports/unix/proj/unixsim/apps/fsdata.c
@ -0,0 +1,334 @@
+static const unsigned char data_img_sics_gif[] = {
+	/* /img/sics.gif */
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+	0x9, 0x20, 0x20, 0x3c, 0x2f, 0x70, 0x3e, 0xa, 0x9, 0x20, 
+	0x20, 0x3c, 0x70, 0x3e, 0xa, 0x9, 0x20, 0x20, 0x20, 0x20, 
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+	0x76, 0x69, 0x6e, 0x67, 0x20, 0x61, 0x20, 0x66, 0x75, 0x6c, 
+	0x6c, 0x20, 0x73, 0x63, 0x61, 0x6c, 0x65, 0x20, 0x54, 0x43, 
+	0x50, 0x2e, 0x20, 0x54, 0x68, 0x69, 0x73, 0xa, 0x9, 0x20, 
+	0x20, 0x20, 0x20, 0x6d, 0x61, 0x6b, 0x65, 0x73, 0x20, 0x6c, 
+	0x77, 0x49, 0x50, 0x20, 0x73, 0x75, 0x69, 0x74, 0x61, 0x62, 
+	0x6c, 0x65, 0x20, 0x66, 0x6f, 0x72, 0x20, 0x75, 0x73, 0x65, 
+	0x20, 0x69, 0x6e, 0x20, 0x65, 0x6d, 0x62, 0x65, 0x64, 0x64, 
+	0x65, 0x64, 0x20, 0x73, 0x79, 0x73, 0x74, 0x65, 0x6d, 0x73, 
+	0x20, 0x77, 0x69, 0x74, 0x68, 0x20, 0x74, 0x65, 0x6e, 0x73, 
+	0xa, 0x9, 0x20, 0x20, 0x20, 0x20, 0x6f, 0x66, 0x20, 0x6b, 
+	0x69, 0x6c, 0x6f, 0x62, 0x79, 0x74, 0x65, 0x73, 0x20, 0x6f, 
+	0x66, 0x20, 0x66, 0x72, 0x65, 0x65, 0x20, 0x52, 0x41, 0x4d, 
+	0x20, 0x61, 0x6e, 0x64, 0x20, 0x72, 0x6f, 0x6f, 0x6d, 0x20, 
+	0x66, 0x6f, 0x72, 0x20, 0x61, 0x72, 0x6f, 0x75, 0x6e, 0x64, 
+	0x20, 0x34, 0x30, 0x20, 0x6b, 0x69, 0x6c, 0x6f, 0x62, 0x79, 
+	0x74, 0x65, 0x73, 0xa, 0x9, 0x20, 0x20, 0x20, 0x20, 0x6f, 
+	0x66, 0x20, 0x63, 0x6f, 0x64, 0x65, 0x20, 0x52, 0x4f, 0x4d, 
+	0x2e, 0xa, 0x9, 0x20, 0x20, 0x3c, 0x2f, 0x70, 0x3e, 0xa, 
+	0x9, 0x20, 0x20, 0x3c, 0x70, 0x3e, 0xa, 0x9, 0x20, 0x20, 
+	0x20, 0x20, 0x4d, 0x6f, 0x72, 0x65, 0x20, 0x69, 0x6e, 0x66, 
+	0x6f, 0x72, 0x6d, 0x61, 0x74, 0x69, 0x6f, 0x6e, 0x20, 0x61, 
+	0x62, 0x6f, 0x75, 0x74, 0x20, 0x6c, 0x77, 0x49, 0x50, 0x20, 
+	0x63, 0x61, 0x6e, 0x20, 0x62, 0x65, 0x20, 0x66, 0x6f, 0x75, 
+	0x6e, 0x64, 0x20, 0x61, 0x74, 0x20, 0x74, 0x68, 0x65, 0x20, 
+	0x6c, 0x77, 0x49, 0x50, 0xa, 0x9, 0x20, 0x20, 0x20, 0x20, 
+	0x68, 0x6f, 0x6d, 0x65, 0x70, 0x61, 0x67, 0x65, 0x20, 0x61, 
+	0x74, 0x20, 0x3c, 0x61, 0xa, 0x9, 0x20, 0x20, 0x20, 0x20, 
+	0x68, 0x72, 0x65, 0x66, 0x3d, 0x22, 0x68, 0x74, 0x74, 0x70, 
+	0x3a, 0x2f, 0x2f, 0x77, 0x77, 0x77, 0x2e, 0x73, 0x69, 0x63, 
+	0x73, 0x2e, 0x73, 0x65, 0x2f, 0x7e, 0x61, 0x64, 0x61, 0x6d, 
+	0x2f, 0x6c, 0x77, 0x69, 0x70, 0x2f, 0x22, 0x3e, 0x68, 0x74, 
+	0x74, 0x70, 0x3a, 0x2f, 0x2f, 0x77, 0x77, 0x77, 0x2e, 0x73, 
+	0x69, 0x63, 0x73, 0x2e, 0x73, 0x65, 0x2f, 0x7e, 0x61, 0x64, 
+	0x61, 0x6d, 0x2f, 0x6c, 0x77, 0x69, 0x70, 0x2f, 0x3c, 0x2f, 
+	0x61, 0x3e, 0x2e, 0xa, 0x9, 0x20, 0x20, 0x3c, 0x2f, 0x70, 
+	0x3e, 0xa, 0x9, 0x3c, 0x2f, 0x74, 0x64, 0x3e, 0x3c, 0x74, 
+	0x64, 0x3e, 0xa, 0x9, 0x20, 0x20, 0x26, 0x6e, 0x62, 0x73, 
+	0x70, 0x3b, 0xa, 0x9, 0x3c, 0x2f, 0x74, 0x64, 0x3e, 0x3c, 
+	0x2f, 0x74, 0x72, 0x3e, 0xa, 0x20, 0x20, 0x20, 0x20, 0x20, 
+	0x20, 0x3c, 0x2f, 0x74, 0x61, 0x62, 0x6c, 0x65, 0x3e, 0xa, 
+	0x3c, 0x2f, 0x62, 0x6f, 0x64, 0x79, 0x3e, 0xa, 0x3c, 0x2f, 
+	0x68, 0x74, 0x6d, 0x6c, 0x3e, 0xa, 0xa, };
+
+const struct fsdata_file file_img_sics_gif[] = {{NULL, data_img_sics_gif, data_img_sics_gif + 14, sizeof(data_img_sics_gif) - 14}};
+
+const struct fsdata_file file_404_html[] = {{file_img_sics_gif, data_404_html, data_404_html + 10, sizeof(data_404_html) - 10}};
+
+const struct fsdata_file file_index_html[] = {{file_404_html, data_index_html, data_index_html + 12, sizeof(data_index_html) - 12}};
+
+#define FS_ROOT file_index_html
+
+#define FS_NUMFILES 3
--- a/ports/unix/proj/unixsim/apps/fsdata.h
+++ b/ports/unix/proj/unixsim/apps/fsdata.h
@ -0,0 +1,49 @@
+/*
+ * 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>
+ *
+ */
+#ifndef __FSDATA_H__
+#define __FSDATA_H__
+
+struct fsdata_file {
+  const struct fsdata_file *next;
+  const unsigned char *name;
+  const unsigned char *data;
+  const int len;
+};
+
+struct fsdata_file_noconst {
+  struct fsdata_file *next;
+  unsigned char *name;
+  unsigned char *data;
+  int len;
+};
+
+#endif /* __FSDATA_H__ */
--- a/ports/unix/proj/unixsim/apps/httpd.c
+++ b/ports/unix/proj/unixsim/apps/httpd.c
@ -0,0 +1,244 @@
+/*
+ * 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/debug.h"
+
+#include "lwip/stats.h"
+
+#include "httpd.h"
+
+#include "lwip/tcp.h"
+
+#include "fs.h"
+
+struct http_state {
+  char *file;
+  u32_t left;
+  u8_t retries;
+};
+
+/*-----------------------------------------------------------------------------------*/
+static void
+conn_err(void *arg, err_t err)
+{
+  struct http_state *hs;
+
+  hs = arg;
+  mem_free(hs);
+}
+/*-----------------------------------------------------------------------------------*/
+static void
+close_conn(struct tcp_pcb *pcb, struct http_state *hs)
+{
+  tcp_arg(pcb, NULL);
+  tcp_sent(pcb, NULL);
+  tcp_recv(pcb, NULL);
+  mem_free(hs);
+  tcp_close(pcb);
+}
+/*-----------------------------------------------------------------------------------*/
+static void
+send_data(struct tcp_pcb *pcb, struct http_state *hs)
+{
+  err_t err;
+  u16_t len;
+
+  /* We cannot send more data than space avaliable in the send
+     buffer. */     
+  if(tcp_sndbuf(pcb) < hs->left) {
+    len = tcp_sndbuf(pcb);
+  } else {
+    len = hs->left;
+  }
+
+  do {
+    err = tcp_write(pcb, hs->file, len, 0);
+    if(err == ERR_MEM) {
+      len /= 2;
+    }
+  } while(err == ERR_MEM && len > 1);  
+  
+  if(err == ERR_OK) {
+    hs->file += len;
+    hs->left -= len;
+    /*  } else {
+	printf("send_data: error %s len %d %d\n", lwip_strerr(err), len, tcp_sndbuf(pcb));*/
+  }
+}
+/*-----------------------------------------------------------------------------------*/
+static err_t
+http_poll(void *arg, struct tcp_pcb *pcb)
+{
+  struct http_state *hs;
+
+  hs = arg;
+  
+  /*  printf("Polll\n");*/
+  if(hs == NULL) {
+    /*    printf("Null, close\n");*/
+    tcp_abort(pcb);
+    return ERR_ABRT;
+  } else {
+    ++hs->retries;
+    if(hs->retries == 4) {
+      tcp_abort(pcb);
+      return ERR_ABRT;
+    }
+    send_data(pcb, hs);
+  }
+
+  return ERR_OK;
+}
+/*-----------------------------------------------------------------------------------*/
+static err_t
+http_sent(void *arg, struct tcp_pcb *pcb, u16_t len)
+{
+  struct http_state *hs;
+
+  hs = arg;
+
+  hs->retries = 0;
+  
+  if(hs->left > 0) {    
+    send_data(pcb, hs);
+  } else {
+    close_conn(pcb, hs);
+  }
+
+  return ERR_OK;
+}
+/*-----------------------------------------------------------------------------------*/
+static err_t
+http_recv(void *arg, struct tcp_pcb *pcb, struct pbuf *p, err_t err)
+{
+  int i;
+  char *data;
+  struct fs_file file;
+  struct http_state *hs;
+
+  hs = arg;
+
+  if(err == ERR_OK && p != NULL) {
+
+    /* Inform TCP that we have taken the data. */
+    tcp_recved(pcb, p->tot_len);
+    
+    if(hs->file == NULL) {
+      data = p->payload;
+      
+      if(strncmp(data, "GET ", 4) == 0) {
+	for(i = 0; i < 40; i++) {
+	  if(((char *)data + 4)[i] == ' ' ||
+	     ((char *)data + 4)[i] == '\r' ||
+	     ((char *)data + 4)[i] == '\n') {
+	    ((char *)data + 4)[i] = 0;
+	  }
+	}
+
+	if(*(char *)(data + 4) == '/' &&
+	   *(char *)(data + 5) == 0) {
+	  fs_open("/index.html", &file);
+	} else if(!fs_open((char *)data + 4, &file)) {
+	  fs_open("/404.html", &file);	 
+	}
+	hs->file = file.data;
+	hs->left = file.len;
+	/*	printf("data %p len %ld\n", hs->file, hs->left);*/
+
+	pbuf_free(p);
+	send_data(pcb, hs);
+
+	/* Tell TCP that we wish be to informed of data that has been
+	   successfully sent by a call to the http_sent() function. */
+	tcp_sent(pcb, http_sent);
+      } else {
+	pbuf_free(p);
+	close_conn(pcb, hs);
+      }
+    } else {
+      pbuf_free(p);
+    }
+  }
+
+  if(err == ERR_OK && p == NULL) {
+    close_conn(pcb, hs);
+  }
+  return ERR_OK;
+}
+/*-----------------------------------------------------------------------------------*/
+static err_t
+http_accept(void *arg, struct tcp_pcb *pcb, err_t err)
+{
+  struct http_state *hs;
+
+  tcp_setprio(pcb, TCP_PRIO_MIN);
+  
+  /* Allocate memory for the structure that holds the state of the
+     connection. */
+  hs = mem_malloc(sizeof(struct http_state));
+
+  if(hs == NULL) {
+    printf("http_accept: Out of memory\n");
+    return ERR_MEM;
+  }
+  
+  /* Initialize the structure. */
+  hs->file = NULL;
+  hs->left = 0;
+  hs->retries = 0;
+  
+  /* Tell TCP that this is the structure we wish to be passed for our
+     callbacks. */
+  tcp_arg(pcb, hs);
+
+  /* Tell TCP that we wish to be informed of incoming data by a call
+     to the http_recv() function. */
+  tcp_recv(pcb, http_recv);
+
+  tcp_err(pcb, conn_err);
+  
+  tcp_poll(pcb, http_poll, 4);
+  return ERR_OK;
+}
+/*-----------------------------------------------------------------------------------*/
+void
+httpd_init(void)
+{
+  struct tcp_pcb *pcb;
+
+  pcb = tcp_new();
+  tcp_bind(pcb, IP_ADDR_ANY, 80);
+  pcb = tcp_listen(pcb);
+  tcp_accept(pcb, http_accept);
+}
+/*-----------------------------------------------------------------------------------*/
+
--- a/ports/unix/proj/unixsim/apps/httpd.h
+++ b/ports/unix/proj/unixsim/apps/httpd.h
@ -0,0 +1,37 @@
+/*
+ * 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>
+ *
+ */
+#ifndef __HTTPD_H__
+#define __HTTPD_H__
+
+void httpd_init(void);
+
+#endif /* __HTTPD_H__ */
--- a/ports/unix/proj/unixsim/apps/makefsdata
+++ b/ports/unix/proj/unixsim/apps/makefsdata
@ -0,0 +1,97 @@
+#!/usr/bin/perl
+
+open(OUTPUT, "> fsdata.c");
+
+chdir("fs");
+open(FILES, "find . -type f |");
+
+while($file = <FILES>) {
+
+    # Do not include files in CVS directories nor backup files.
+    if($file =~ /(CVS|~)/) {
+    	next;
+    }
+    
+    chop($file);
+    
+    open(HEADER, "> /tmp/header") || die $!;
+    if($file =~ /404/) {
+	print(HEADER "HTTP/1.0 404 File not found\r\n");
+    } else {
+	print(HEADER "HTTP/1.0 200 OK\r\n");
+    }
+    print(HEADER "Server: lwIP/pre-0.6 (http://www.sics.se/~adam/lwip/)\r\n");
+    if($file =~ /\.html$/) {
+	print(HEADER "Content-type: text/html\r\n");
+    } elsif($file =~ /\.gif$/) {
+	print(HEADER "Content-type: image/gif\r\n");
+    } elsif($file =~ /\.png$/) {
+	print(HEADER "Content-type: image/png\r\n");
+    } elsif($file =~ /\.jpg$/) {
+	print(HEADER "Content-type: image/jpeg\r\n");
+    } elsif($file =~ /\.class$/) {
+	print(HEADER "Content-type: application/octet-stream\r\n");
+    } elsif($file =~ /\.ram$/) {
+	print(HEADER "Content-type: audio/x-pn-realaudio\r\n");    
+    } else {
+	print(HEADER "Content-type: text/plain\r\n");
+    }
+    print(HEADER "\r\n");
+    close(HEADER);
+
+    unless($file =~ /\.plain$/ || $file =~ /cgi/) {
+	system("cat /tmp/header $file > /tmp/file");
+    } else {
+	system("cp $file /tmp/file");
+    }
+    
+    open(FILE, "/tmp/file");
+    unlink("/tmp/file");
+    unlink("/tmp/header");
+
+    $file =~ s/\.//;
+    $fvar = $file;
+    $fvar =~ s-/-_-g;
+    $fvar =~ s-\.-_-g;
+    print(OUTPUT "static const unsigned char data".$fvar."[] = {\n");
+    print(OUTPUT "\t/* $file */\n\t");
+    for($j = 0; $j < length($file); $j++) {
+	printf(OUTPUT "%#02x, ", unpack("C", substr($file, $j, 1)));
+    }
+    printf(OUTPUT "0,\n");
+    
+    
+    $i = 0;
+    while(read(FILE, $data, 1)) {
+        if($i == 0) {
+            print(OUTPUT "\t");
+        }
+        printf(OUTPUT "%#02x, ", unpack("C", $data));
+        $i++;
+        if($i == 10) {
+            print(OUTPUT "\n");
+            $i = 0;
+        }
+    }
+    print(OUTPUT "};\n\n");
+    close(FILE);
+    push(@fvars, $fvar);
+    push(@files, $file);
+}
+
+for($i = 0; $i < @fvars; $i++) {
+    $file = $files[$i];
+    $fvar = $fvars[$i];
+
+    if($i == 0) {
+        $prevfile = "NULL";
+    } else {
+        $prevfile = "file" . $fvars[$i - 1];
+    }
+    print(OUTPUT "const struct fsdata_file file".$fvar."[] = {{$prevfile, data$fvar, ");
+    print(OUTPUT "data$fvar + ". (length($file) + 1) .", ");
+    print(OUTPUT "sizeof(data$fvar) - ". (length($file) + 1) ."}};\n\n");
+}
+
+print(OUTPUT "#define FS_ROOT file$fvars[$i - 1]\n\n");
+print(OUTPUT "#define FS_NUMFILES $i\n");
--- a/ports/unix/proj/unixsim/apps/shell.c
+++ b/ports/unix/proj/unixsim/apps/shell.c
--- a/ports/unix/proj/unixsim/apps/shell.h
+++ b/ports/unix/proj/unixsim/apps/shell.h
@ -0,0 +1,37 @@
+/*
+ * 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>
+ *
+ */
+#ifndef __SHELL_H__
+#define __SHELL_H__
+
+void shell_init(void);
+
+#endif /* __SHELL_H__ */
--- a/ports/unix/proj/unixsim/apps/tcpecho.c
+++ b/ports/unix/proj/unixsim/apps/tcpecho.c
@ -0,0 +1,88 @@
+/*
+ * 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/sys.h"
+#include "lwip/api.h"
+/*-----------------------------------------------------------------------------------*/
+static void 
+tcpecho_thread(void *arg)
+{
+  struct netconn *conn, *newconn;
+  err_t err;
+
+  /* Create a new connection identifier. */
+  conn = netconn_new(NETCONN_TCP);
+
+  /* Bind connection to well known port number 7. */
+  netconn_bind(conn, NULL, 7);
+
+  /* Tell connection to go into listening mode. */
+  netconn_listen(conn);
+
+  while(1) {
+
+    /* Grab new connection. */
+    newconn = netconn_accept(conn);
+    /*printf("accepted new connection %p\n", newconn);*/
+    /* Process the new connection. */
+    if(newconn != NULL) {
+      struct netbuf *buf;
+      void *data;
+      u16_t len;
+      
+      while((buf = netconn_recv(newconn)) != NULL) {
+	/*printf("Recved\n");*/
+	do {
+	  netbuf_data(buf, &data, &len);
+	  err = netconn_write(newconn, data, len, NETCONN_COPY);
+	  if(err != ERR_OK) {
+	    /*	    printf("tcpecho: netconn_write: error \"%s\"\n", lwip_strerr(err));*/
+	  }
+	} while(netbuf_next(buf) >= 0);
+	netbuf_delete(buf);	
+      }
+      /*printf("Got EOF, looping\n");*/
+      /* Close connection and discard connection identifier. */
+      netconn_delete(newconn);
+    }
+  }
+}
+/*-----------------------------------------------------------------------------------*/
+void
+tcpecho_init(void)
+{
+  sys_thread_new(tcpecho_thread, NULL);  
+}
+/*-----------------------------------------------------------------------------------*/
+
+
+
--- a/ports/unix/proj/unixsim/apps/tcpecho.h
+++ b/ports/unix/proj/unixsim/apps/tcpecho.h
@ -0,0 +1,38 @@
+/*
+ * 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>
+ *
+ */
+
+#ifndef __TCPECHO_H__
+#define __TCPECHO_H__
+
+void tcpecho_init(void);
+
+#endif /* __TCPECHO_H__ */
--- a/ports/unix/proj/unixsim/apps/udpecho.c
+++ b/ports/unix/proj/unixsim/apps/udpecho.c
@ -0,0 +1,66 @@
+/*
+ * 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/api.h"
+#include "lwip/sys.h"
+
+/*-----------------------------------------------------------------------------------*/
+void 
+udpecho_thread(void *arg)
+{
+  static struct netconn *conn;
+  static struct netbuf *buf;
+  static struct ip_addr *addr;
+  static unsigned short port;
+  char buffer[4096];
+  
+  conn = netconn_new(NETCONN_UDP);
+  netconn_bind(conn, NULL, 7);
+
+  while(1) {
+    buf = netconn_recv(conn);
+    addr = netbuf_fromaddr(buf);
+    port = netbuf_fromport(buf);
+    netconn_connect(conn, addr, port);
+    netbuf_copy(buf, buffer, buf->p->tot_len);
+    buffer[buf->p->tot_len] = '\0';
+    netconn_send(conn, buf);
+    printf("got %s\n", buffer);
+    netbuf_delete(buf);
+  }
+}
+/*-----------------------------------------------------------------------------------*/
+void
+udpecho_init(void)
+{
+  sys_thread_new(udpecho_thread, NULL);
+}
--- a/ports/unix/proj/unixsim/apps/udpecho.h
+++ b/ports/unix/proj/unixsim/apps/udpecho.h
@ -0,0 +1,37 @@
+/*
+ * 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>
+ *
+ */
+#ifndef __UDPECHO_H__
+#define __UDPECHO_H__
+
+void udpecho_init(void);
+
+#endif /* __UDPECHO_H__ */
--- a/ports/unix/proj/unixsim/lwipopts.h
+++ b/ports/unix/proj/unixsim/lwipopts.h
@ -0,0 +1,184 @@
+/*
+ * 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>
+ *
+ */
+#ifndef __LWIPOPTS_H__
+#define __LWIPOPTS_H__
+/* ---------- Memory options ---------- */
+/* MEM_ALIGNMENT: should be set to the alignment of the CPU for which
+   lwIP is compiled. 4 byte alignment -> define MEM_ALIGNMENT to 4, 2
+   byte alignment -> define MEM_ALIGNMENT to 2. */
+#define MEM_ALIGNMENT           1
+
+/* MEM_SIZE: the size of the heap memory. If the application will send
+a lot of data that needs to be copied, this should be set high. */
+#define MEM_SIZE                1600
+
+/* MEMP_NUM_PBUF: the number of memp struct pbufs. If the application
+   sends a lot of data out of ROM (or other static memory), this
+   should be set high. */
+#define MEMP_NUM_PBUF           16
+/* MEMP_NUM_UDP_PCB: the number of UDP protocol control blocks. One
+   per active UDP "connection". */
+#define MEMP_NUM_UDP_PCB        4
+/* MEMP_NUM_TCP_PCB: the number of simulatenously active TCP
+   connections. */
+#define MEMP_NUM_TCP_PCB        5
+/* MEMP_NUM_TCP_PCB_LISTEN: the number of listening TCP
+   connections. */
+#define MEMP_NUM_TCP_PCB_LISTEN 8
+/* MEMP_NUM_TCP_SEG: the number of simultaneously queued TCP
+   segments. */
+#define MEMP_NUM_TCP_SEG        16
+/* MEMP_NUM_SYS_TIMEOUT: the number of simulateously active
+   timeouts. */
+#define MEMP_NUM_SYS_TIMEOUT    3
+
+/* The following four are used only with the sequential API and can be
+   set to 0 if the application only will use the raw API. */
+/* MEMP_NUM_NETBUF: the number of struct netbufs. */
+#define MEMP_NUM_NETBUF         2
+/* MEMP_NUM_NETCONN: the number of struct netconns. */
+#define MEMP_NUM_NETCONN        4
+/* MEMP_NUM_APIMSG: the number of struct api_msg, used for
+   communication between the TCP/IP stack and the sequential
+   programs. */
+#define MEMP_NUM_API_MSG        8
+/* MEMP_NUM_TCPIPMSG: the number of struct tcpip_msg, which is used
+   for sequential API communication and incoming packets. Used in
+   src/api/tcpip.c. */
+#define MEMP_NUM_TCPIP_MSG      8
+
+/* These two control is reclaimer functions should be compiled
+   in. Should always be turned on (1). */
+#define MEM_RECLAIM             1
+#define MEMP_RECLAIM            1
+
+/* ---------- Pbuf options ---------- */
+/* PBUF_POOL_SIZE: the number of buffers in the pbuf pool. */
+#define PBUF_POOL_SIZE          100
+
+/* PBUF_POOL_BUFSIZE: the size of each pbuf in the pbuf pool. */
+#define PBUF_POOL_BUFSIZE       128
+
+/* PBUF_LINK_HLEN: the number of bytes that should be allocated for a
+   link level header. */
+#define PBUF_LINK_HLEN          16
+
+/* ---------- TCP options ---------- */
+#define LWIP_TCP                1
+#define TCP_TTL                 255
+
+/* Controls if TCP should queue segments that arrive out of
+   order. Define to 0 if your device is low on memory. */
+#define TCP_QUEUE_OOSEQ         1
+
+/* TCP Maximum segment size. */
+#define TCP_MSS                 128
+
+/* TCP sender buffer space (bytes). */
+#define TCP_SND_BUF             256
+
+/* TCP sender buffer space (pbufs). This must be at least = 2 *
+   TCP_SND_BUF/TCP_MSS for things to work. */
+#define TCP_SND_QUEUELEN        4 * TCP_SND_BUF/TCP_MSS
+
+/* TCP receive window. */
+#define TCP_WND                 1024
+
+/* Maximum number of retransmissions of data segments. */
+#define TCP_MAXRTX              12
+
+/* Maximum number of retransmissions of SYN segments. */
+#define TCP_SYNMAXRTX           4
+
+/* ---------- ARP options ---------- */
+#define ARP_TABLE_SIZE 10
+#define ARP_QUEUEING 1
+/**
+ * - If enabled, cache entries are generated for every kind of ARP traffic or
+ * broadcast IP traffic. This enhances behaviour for sending to a dynamic set
+ * of hosts, for example if acting as a gateway.
+ * - If disabled, cache entries are generated only for IP destination addresses
+ * in use by lwIP or applications. This enhances performance if sending to a small,
+ * reasonably static number of hosts. Typically for embedded devices.
+ */
+#define ETHARP_ALWAYS_INSERT 1
+
+
+/* ---------- IP options ---------- */
+/* Define IP_FORWARD to 1 if you wish to have the ability to forward
+   IP packets across network interfaces. If you are going to run lwIP
+   on a device with only one network interface, define this to 0. */
+#define IP_FORWARD              1
+
+/* If defined to 1, IP options are allowed (but not parsed). If
+   defined to 0, all packets with IP options are dropped. */
+#define IP_OPTIONS              1
+
+/* IP reassembly and segmentation.These are orthogonal even
+ * if they both deal with IP fragments */
+#define IP_REASSEMBLY     1
+#define IP_FRAG           1
+
+/* ---------- ICMP options ---------- */
+#define ICMP_TTL                255
+
+/* ---------- DHCP options ---------- */
+/* Define LWIP_DHCP to 1 if you want DHCP configuration of
+   interfaces. DHCP is not implemented in lwIP 0.5.1, however, so
+   turning this on does currently not work. */
+#define LWIP_DHCP               0
+
+/* 1 if you want to do an ARP check on the offered address
+   (recommended). */
+#define DHCP_DOES_ARP_CHECK     1
+
+/* ---------- UDP options ---------- */
+#define LWIP_UDP                1
+#define UDP_TTL                 255
+
+
+/* ---------- Statistics options ---------- */
+#define STATS
+
+#ifdef STATS
+#define LINK_STATS
+#define IP_STATS
+#define ICMP_STATS
+#define UDP_STATS
+#define TCP_STATS
+#define MEM_STATS
+#define MEMP_STATS
+#define PBUF_STATS
+#define SYS_STATS
+#endif /* STATS */
+
+#endif /* __LWIPOPTS_H__ */
--- a/ports/unix/proj/unixsim/simhost.c
+++ b/ports/unix/proj/unixsim/simhost.c
@ -0,0 +1,189 @@
+/*
+ * 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/debug.h"
+
+#include <unistd.h>
+
+#include "lwip/opt.h"
+
+#include "lwip/mem.h"
+#include "lwip/memp.h"
+#include "lwip/sys.h"
+
+#include "lwip/stats.h"
+
+
+#include "lwip/tcpip.h"
+
+#include "netif/tapif.h"
+#include "netif/tunif.h"
+
+#include "netif/unixif.h"
+#include "netif/dropif.h"
+#include "netif/pcapif.h"
+#include "netif/loopif.h"
+
+#include "netif/tcpdump.h"
+
+
+
+
+#include "lwip/ip_addr.h"
+
+#include "arch/perf.h"
+
+#include "httpd.h"
+#include "udpecho.h"
+#include "tcpecho.h"
+#include "shell.h"
+
+/*-----------------------------------------------------------------------------------*/
+static void
+tcp_timeout(void *data)
+{
+#if TCP_DEBUG
+  tcp_debug_print_pcbs();
+#endif /* TCP_DEBUG */
+  sys_timeout(5000, tcp_timeout, NULL);
+}
+/*-----------------------------------------------------------------------------------*/
+static void
+tcpip_init_done(void *arg)
+{
+  sys_sem_t *sem;
+  sem = arg;
+  sys_sem_signal(*sem);
+}
+/*-----------------------------------------------------------------------------------*/
+static void
+main_thread(void *arg)
+{
+  struct ip_addr ipaddr, netmask, gw;
+  sys_sem_t sem;
+
+  netif_init();
+
+  sem = sys_sem_new(0);
+  tcpip_init(tcpip_init_done, &sem);
+  sys_sem_wait(sem);
+  sys_sem_free(sem);
+  printf("TCP/IP initialized.\n");
+  
+#if LWIP_DHCP
+  {
+    struct netif *netif;
+    IP4_ADDR(&gw, 0,0,0,0);
+    IP4_ADDR(&ipaddr, 0,0,0,0);
+    IP4_ADDR(&netmask, 0,0,0,0);
+
+    netif = netif_add(&ipaddr, &netmask, &gw, tapif_init,
+		      tcpip_input);
+    netif_set_default(netif);
+    dhcp_init();
+    dhcp_start(netif);
+  }
+#else
+  IP4_ADDR(&gw, 192,168,0,1);
+  IP4_ADDR(&ipaddr, 192,168,0,2);
+  IP4_ADDR(&netmask, 255,255,255,0);
+  
+  /*  netif_set_default(netif_add(&ipaddr, &netmask, &gw, tapif_init,
+      tcpip_input));*/
+  netif_set_default(netif_add(&ipaddr, &netmask, &gw, tapif_init,
+			      tcpip_input));
+#endif
+  /* Only used for testing purposes: */
+  /*  IP4_ADDR(&gw, 193,10,66,1);
+  IP4_ADDR(&ipaddr, 193,10,66,107);
+  IP4_ADDR(&netmask, 255,255,252,0);
+  
+  netif_add(&ipaddr, &netmask, &gw, pcapif_init,
+  tcpip_input);*/
+  
+  IP4_ADDR(&gw, 127,0,0,1);
+  IP4_ADDR(&ipaddr, 127,0,0,1);
+  IP4_ADDR(&netmask, 255,0,0,0);
+  
+  netif_add(&ipaddr, &netmask, &gw, loopif_init,
+	    tcpip_input);
+   
+  tcpecho_init();
+  shell_init();
+  httpd_init();
+  udpecho_init();
+  
+  printf("Applications started.\n");
+
+  /*  sys_timeout(5000, tcp_timeout, NULL);*/
+
+#ifdef MEM_PERF
+  mem_perf_init("/tmp/memstats.client");
+#endif /* MEM_PERF */
+
+  /* Block for ever. */
+  sem = sys_sem_new(0);
+  sys_sem_wait(sem);
+}
+/*-----------------------------------------------------------------------------------*/
+int
+main(int argc, char **argv)
+{
+#ifdef PERF
+  perf_init("/tmp/simhost.perf");
+#endif /* PERF */
+#ifdef STATS
+  stats_init();
+#endif /* STATS */
+  sys_init();
+  mem_init();
+  memp_init();
+  pbuf_init();
+
+  tcpdump_init();
+
+  
+  printf("System initialized.\n");
+    
+  sys_thread_new((void *)(main_thread), NULL);
+  pause();
+  return 0;
+}
+/*-----------------------------------------------------------------------------------*/
+
+
+
+
+
+
+
+
--- a/ports/unix/proj/unixsim/simnode.c
+++ b/ports/unix/proj/unixsim/simnode.c
@ -0,0 +1,154 @@
+/*
+ * 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/debug.h"
+
+#include <unistd.h>
+
+
+#include "lwip/mem.h"
+#include "lwip/memp.h"
+#include "lwip/sys.h"
+
+#include "lwip/stats.h"
+
+
+#include "lwip/tcpip.h"
+
+
+#include "netif/unixif.h"
+#include "netif/dropif.h"
+
+#include "netif/loopif.h"
+
+#include "netif/tcpdump.h"
+
+#include "lwip/ip_addr.h"
+
+#include "arch/perf.h"
+
+#include "httpd.h"
+#include "udpecho.h"
+#include "tcpecho.h"
+#include "shell.h"
+
+/*-----------------------------------------------------------------------------------*/
+static void
+tcp_timeout(void *data)
+{
+#if TCP_DEBUG
+  tcp_debug_print_pcbs();
+#endif /* TCP_DEBUG */
+  sys_timeout(5000, tcp_timeout, NULL);
+}
+/*-----------------------------------------------------------------------------------*/
+static void
+tcpip_init_done(void *arg)
+{
+  sys_sem_t *sem;
+  sem = arg;
+  sys_sem_signal(*sem);
+}
+/*-----------------------------------------------------------------------------------*/
+static void
+main_thread(void *arg)
+{
+  struct ip_addr ipaddr, netmask, gw;
+  sys_sem_t sem;
+
+    
+  IP4_ADDR(&gw, 192,168,1,1);
+  IP4_ADDR(&ipaddr, 192,168,1,2);
+  IP4_ADDR(&netmask, 255,255,255,0);
+
+  netif_set_default(netif_add(&ipaddr, &netmask, &gw, unixif_init_client,
+			      tcpip_input));
+  /*  netif_set_default(netif_add(&ipaddr, &netmask, &gw, sioslipif_init1,
+			      tcpip_input)); */
+
+  
+  sem = sys_sem_new(0);
+  tcpip_init(tcpip_init_done, &sem);
+  sys_sem_wait(sem);
+  sys_sem_free(sem);
+  printf("TCP/IP initialized.\n");
+
+  tcpecho_init();
+  shell_init();
+  httpd_init();
+  udpecho_init();
+
+  printf("Applications started.\n");
+    
+  sys_timeout(5000, tcp_timeout, NULL);
+
+#ifdef MEM_PERF
+  mem_perf_init("/tmp/memstats.client");
+#endif /* MEM_PERF */
+
+  sem = sys_sem_new(0);
+  sys_sem_wait(sem);
+
+}
+/*-----------------------------------------------------------------------------------*/
+int
+main(int argc, char **argv)
+{
+#ifdef PERF
+  perf_init("/tmp/client.perf");
+#endif /* PERF */
+#ifdef STATS
+  stats_init();
+#endif /* STATS */
+  sys_init();
+  mem_init();
+  memp_init();
+  pbuf_init();
+
+  tcpdump_init();
+
+  
+  printf("System initialized.\n");
+    
+  sys_thread_new((void *)(main_thread), NULL);
+  pause();
+  return 0;
+}
+/*-----------------------------------------------------------------------------------*/
+
+
+
+
+
+
+
+
--- a/ports/unix/proj/unixsim/simrouter.c
+++ b/ports/unix/proj/unixsim/simrouter.c
@ -0,0 +1,165 @@
+/*
+ * 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/debug.h"
+
+#include <unistd.h>
+
+
+#include "lwip/mem.h"
+#include "lwip/memp.h"
+#include "lwip/sys.h"
+
+#include "lwip/stats.h"
+
+
+#include "lwip/tcpip.h"
+
+#include "netif/tapif.h"
+
+#include "netif/unixif.h"
+#include "netif/dropif.h"
+
+#include "netif/loopif.h"
+
+#include "netif/tcpdump.h"
+
+
+#include "lwip/ip_addr.h"
+
+#include "arch/perf.h"
+
+#include "httpd.h"
+#include "udpecho.h"
+#include "tcpecho.h"
+#include "shell.h"
+
+/*-----------------------------------------------------------------------------------*/
+static void
+tcp_timeout(void *data)
+{
+#if TCP_DEBUG
+  tcp_debug_print_pcbs();
+#endif /* TCP_DEBUG */
+  sys_timeout(5000, tcp_timeout, NULL);
+}
+/*-----------------------------------------------------------------------------------*/
+static void
+tcpip_init_done(void *arg)
+{
+  sys_sem_t *sem;
+  sem = arg;
+  sys_sem_signal(*sem);
+}
+/*-----------------------------------------------------------------------------------*/
+static void
+main_thread(void *arg)
+{
+  struct ip_addr ipaddr, netmask, gw;
+  sys_sem_t sem;
+
+    
+  IP4_ADDR(&gw, 192,168,0,1);
+  IP4_ADDR(&ipaddr, 192,168,0,2);
+  IP4_ADDR(&netmask, 255,255,255,0);
+
+  netif_set_default(netif_add(&ipaddr, &netmask, &gw, tapif_init,
+			      tcpip_input));
+
+  IP4_ADDR(&gw, 192,168,1,1);
+  IP4_ADDR(&ipaddr, 192,168,1,1);
+  IP4_ADDR(&netmask, 255,255,255,0);
+  netif_set_default(netif_add(&ipaddr, &netmask, &gw, unixif_init_server,
+			      tcpip_input));
+
+  system("route add 192.168.1.1 192.168.0.2");
+  system("route add 192.168.1.2 192.168.0.2");
+
+  
+  /*netif_set_default(netif_add(&ipaddr, &netmask, &gw, sioslipif_init1,
+			      tcpip_input)); */
+
+  
+  sem = sys_sem_new(0);
+  tcpip_init(tcpip_init_done, &sem);
+  sys_sem_wait(sem);
+  sys_sem_free(sem);
+  printf("TCP/IP initialized.\n");
+
+  tcpecho_init();
+  shell_init();
+  httpd_init();
+  udpecho_init();
+
+  printf("Applications started.\n");
+    
+  sys_timeout(5000, tcp_timeout, NULL);
+
+#ifdef MEM_PERF
+  mem_perf_init("/tmp/memstats.client");
+#endif /* MEM_PERF */
+  sem = sys_sem_new(0);
+  sys_sem_wait(sem);
+}
+/*-----------------------------------------------------------------------------------*/
+int
+main(int argc, char **argv)
+{
+#ifdef PERF
+  perf_init("/tmp/client.perf");
+#endif /* PERF */
+#ifdef STATS
+  stats_init();
+#endif /* STATS */
+  sys_init();
+  mem_init();
+  memp_init();
+  pbuf_init();
+
+  tcpdump_init();
+
+  
+  printf("System initialized.\n");
+    
+  sys_thread_new((void *)(main_thread), NULL);
+  pause();
+  return 0;
+}
+/*-----------------------------------------------------------------------------------*/
+
+
+
+
+
+
+
+