Use const and static as needed, disable unused code

git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@3452 c046a42c-6fe2-441c-8c8c-71466251a162

28 files changed, 163 insertions, 221 deletions

diff --git a/slirp/bootp.c b/slirp/bootp.c
index 9f2635bf3..3ae3db209 100644
--- a/slirp/bootp.c
+++ b/slirp/bootp.c
@@ -149,7 +149,7 @@ static void bootp_reply(struct bootp_t *bp)
 
     if ((m = m_get()) == NULL)
         return;
-    m->m_data += if_maxlinkhdr;
+    m->m_data += IF_MAXLINKHDR;
     rbp = (struct bootp_t *)m->m_data;
     m->m_data += sizeof(struct udpiphdr);
     memset(rbp, 0, sizeof(struct bootp_t));
diff --git a/slirp/debug.c b/slirp/debug.c
index 77d504452..7c8581d63 100644
--- a/slirp/debug.c
+++ b/slirp/debug.c
@@ -92,9 +92,9 @@ ttystats(ttyp)
 
 	lprint(" \r\n");
 
-	if (if_comp & IF_COMPRESS)
+	if (IF_COMP & IF_COMPRESS)
 	   strcpy(buff, "on");
-	else if (if_comp & IF_NOCOMPRESS)
+	else if (IF_COMP & IF_NOCOMPRESS)
 	   strcpy(buff, "off");
 	else
 	   strcpy(buff, "off (for now)");
diff --git a/slirp/if.c b/slirp/if.c
index 6d72fa72f..6feca55e3 100644
--- a/slirp/if.c
+++ b/slirp/if.c
@@ -7,9 +7,6 @@
 
 #include <slirp.h>
 
-int if_mtu, if_mru;
-int if_comp;
-int if_maxlinkhdr;
 int     if_queued = 0;                  /* Number of packets queued so far */
 int     if_thresh = 10;                 /* Number of packets queued before we start sending
 					 * (to prevent allocing too many mbufs) */
@@ -41,23 +38,6 @@ ifs_remque(ifm)
 void
 if_init()
 {
-#if 0
-	/*
-	 * Set if_maxlinkhdr to 48 because it's 40 bytes for TCP/IP,
-	 * and 8 bytes for PPP, but need to have it on an 8byte boundary
-	 */
-#ifdef USE_PPP
-	if_maxlinkhdr = 48;
-#else
-	if_maxlinkhdr = 40;
-#endif
-#else
-        /* 2 for alignment, 14 for ethernet, 40 for TCP/IP */
-        if_maxlinkhdr = 2 + 14 + 40;
-#endif
-	if_mtu = 1500;
-	if_mru = 1500;
-	if_comp = IF_AUTOCOMP;
 	if_fastq.ifq_next = if_fastq.ifq_prev = &if_fastq;
 	if_batchq.ifq_next = if_batchq.ifq_prev = &if_batchq;
         //	sl_compress_init(&comp_s);
diff --git a/slirp/if.h b/slirp/if.h
index 8f78ce7b6..ea96696b9 100644
--- a/slirp/if.h
+++ b/slirp/if.h
@@ -13,12 +13,25 @@
 #define IF_AUTOCOMP	0x04	/* Autodetect (default) */
 #define IF_NOCIDCOMP	0x08	/* CID compression */
 
-/* Needed for FreeBSD */
-#undef if_mtu
-extern int	if_mtu;
-extern int	if_mru;	/* MTU and MRU */
-extern int	if_comp;	/* Flags for compression */
-extern int	if_maxlinkhdr;
+#define IF_MTU 1500
+#define IF_MRU 1500
+#define	IF_COMP IF_AUTOCOMP	/* Flags for compression */
+
+#if 0
+/*
+ * Set if_maxlinkhdr to 48 because it's 40 bytes for TCP/IP,
+ * and 8 bytes for PPP, but need to have it on an 8byte boundary
+ */
+#ifdef USE_PPP
+#define IF_MAXLINKHDR 48
+#else
+#define IF_MAXLINKHDR 40
+#endif
+#else
+        /* 2 for alignment, 14 for ethernet, 40 for TCP/IP */
+#define IF_MAXLINKHDR (2 + 14 + 40)
+#endif
+
 extern int	if_queued;	/* Number of packets queued so far */
 extern int	if_thresh;	/* Number of packets queued before we start sending
 				 * (to prevent allocing too many mbufs) */
diff --git a/slirp/ip.h b/slirp/ip.h
index 007facf3f..a8cdb0d3f 100644
--- a/slirp/ip.h
+++ b/slirp/ip.h
@@ -312,6 +312,4 @@ extern struct	ipstat	ipstat;
 extern struct	ipq	ipq;			/* ip reass. queue */
 extern u_int16_t	ip_id;				/* ip packet ctr, for ids */
 
-extern int	ip_defttl;			/* default IP ttl */
-
 #endif
diff --git a/slirp/ip_icmp.c b/slirp/ip_icmp.c
index 4cf14c8e3..b589651ca 100644
--- a/slirp/ip_icmp.c
+++ b/slirp/ip_icmp.c
@@ -46,7 +46,7 @@ struct icmpstat icmpstat;
 char icmp_ping_msg[] = "This is a psuedo-PING packet used by Slirp to emulate ICMP ECHO-REQUEST packets.\n";
 
 /* list of actions for icmp_error() on RX of an icmp message */
-static int icmp_flush[19] = {
+static const int icmp_flush[19] = {
 /*  ECHO REPLY (0)  */   0,
 		         1,
 		         1,
diff --git a/slirp/ip_input.c b/slirp/ip_input.c
index 629745fba..b04684027 100644
--- a/slirp/ip_input.c
+++ b/slirp/ip_input.c
@@ -45,14 +45,19 @@
 #include <slirp.h>
 #include "ip_icmp.h"
 
-int ip_defttl;
-
 #ifdef LOG_ENABLED
 struct ipstat ipstat;
 #endif
 
 struct ipq ipq;
 
+static struct ip *ip_reass(register struct ipasfrag *ip,
+                           register struct ipq *fp);
+static void ip_freef(struct ipq *fp);
+static void ip_enq(register struct ipasfrag *p,
+                   register struct ipasfrag *prev);
+static void ip_deq(register struct ipasfrag *p);
+
 /*
  * IP initialization: fill in IP protocol switch table.
  * All protocols not implemented in kernel go to raw IP protocol handler.
@@ -64,7 +69,6 @@ ip_init()
 	ip_id = tt.tv_sec & 0xffff;
 	udp_init();
 	tcp_init();
-	ip_defttl = IPDEFTTL;
 }
 
 /*
@@ -239,10 +243,8 @@ bad:
  * reassembly of this datagram already exists, then it
  * is given as fp; otherwise have to make a chain.
  */
-struct ip *
-ip_reass(ip, fp)
-	register struct ipasfrag *ip;
-	register struct ipq *fp;
+static struct ip *
+ip_reass(register struct ipasfrag *ip, register struct ipq *fp)
 {
 	register struct mbuf *m = dtom(ip);
 	register struct ipasfrag *q;
@@ -398,9 +400,8 @@ dropfrag:
  * Free a fragment reassembly header and all
  * associated datagrams.
  */
-void
-ip_freef(fp)
-	struct ipq *fp;
+static void
+ip_freef(struct ipq *fp)
 {
 	register struct ipasfrag *q, *p;
 
@@ -418,9 +419,8 @@ ip_freef(fp)
  * Put an ip fragment on a reassembly chain.
  * Like insque, but pointers in middle of structure.
  */
-void
-ip_enq(p, prev)
-	register struct ipasfrag *p, *prev;
+static void
+ip_enq(register struct ipasfrag *p, register struct ipasfrag *prev)
 {
 	DEBUG_CALL("ip_enq");
 	DEBUG_ARG("prev = %lx", (long)prev);
@@ -433,9 +433,8 @@ ip_enq(p, prev)
 /*
  * To ip_enq as remque is to insque.
  */
-void
-ip_deq(p)
-	register struct ipasfrag *p;
+static void
+ip_deq(register struct ipasfrag *p)
 {
 	((struct ipasfrag *)(p->ipf_prev))->ipf_next = p->ipf_next;
 	((struct ipasfrag *)(p->ipf_next))->ipf_prev = p->ipf_prev;
diff --git a/slirp/ip_output.c b/slirp/ip_output.c
index b41d0627c..86cf3a033 100644
--- a/slirp/ip_output.c
+++ b/slirp/ip_output.c
@@ -96,7 +96,7 @@ ip_output(so, m0)
 	/*
 	 * If small enough for interface, can just send directly.
 	 */
-	if ((u_int16_t)ip->ip_len <= if_mtu) {
+	if ((u_int16_t)ip->ip_len <= IF_MTU) {
 		ip->ip_len = htons((u_int16_t)ip->ip_len);
 		ip->ip_off = htons((u_int16_t)ip->ip_off);
 		ip->ip_sum = 0;
@@ -116,7 +116,7 @@ ip_output(so, m0)
 		goto bad;
 	}
 
-	len = (if_mtu - hlen) &~ 7;       /* ip databytes per packet */
+	len = (IF_MTU - hlen) &~ 7;       /* ip databytes per packet */
 	if (len < 8) {
 		error = -1;
 		goto bad;
@@ -140,7 +140,7 @@ ip_output(so, m0)
 	    STAT(ipstat.ips_odropped++);
 	    goto sendorfree;
 	  }
-	  m->m_data += if_maxlinkhdr;
+	  m->m_data += IF_MAXLINKHDR;
 	  mhip = mtod(m, struct ip *);
 	  *mhip = *ip;
 
diff --git a/slirp/main.h b/slirp/main.h
index 9cd87584e..c01addac4 100644
--- a/slirp/main.h
+++ b/slirp/main.h
@@ -42,7 +42,6 @@ extern char *username;
 extern char *socket_path;
 extern int towrite_max;
 extern int ppp_exit;
-extern int so_options;
 extern int tcp_keepintvl;
 extern uint8_t client_ethaddr[6];
 
diff --git a/slirp/mbuf.c b/slirp/mbuf.c
index 392aea826..5d1255428 100644
--- a/slirp/mbuf.c
+++ b/slirp/mbuf.c
@@ -21,27 +21,20 @@ struct	mbuf *mbutl;
 char	*mclrefcnt;
 int mbuf_alloced = 0;
 struct mbuf m_freelist, m_usedlist;
-int mbuf_thresh = 30;
+#define MBUF_THRESH 30
 int mbuf_max = 0;
-int msize;
+
+/*
+ * Find a nice value for msize
+ * XXX if_maxlinkhdr already in mtu
+ */
+#define MSIZE (IF_MTU + IF_MAXLINKHDR + sizeof(struct m_hdr ) + 6)
 
 void
 m_init()
 {
 	m_freelist.m_next = m_freelist.m_prev = &m_freelist;
 	m_usedlist.m_next = m_usedlist.m_prev = &m_usedlist;
-	msize_init();
-}
-
-void
-msize_init()
-{
-	/*
-	 * Find a nice value for msize
-	 * XXX if_maxlinkhdr already in mtu
-	 */
-	msize = (if_mtu>if_mru?if_mtu:if_mru) +
-			if_maxlinkhdr + sizeof(struct m_hdr ) + 6;
 }
 
 /*
@@ -61,10 +54,10 @@ m_get()
 	DEBUG_CALL("m_get");
 
 	if (m_freelist.m_next == &m_freelist) {
-		m = (struct mbuf *)malloc(msize);
+		m = (struct mbuf *)malloc(MSIZE);
 		if (m == NULL) goto end_error;
 		mbuf_alloced++;
-		if (mbuf_alloced > mbuf_thresh)
+		if (mbuf_alloced > MBUF_THRESH)
 			flags = M_DOFREE;
 		if (mbuf_alloced > mbuf_max)
 			mbuf_max = mbuf_alloced;
@@ -78,7 +71,7 @@ m_get()
 	m->m_flags = (flags | M_USEDLIST);
 
 	/* Initialise it */
-	m->m_size = msize - sizeof(struct m_hdr);
+	m->m_size = MSIZE - sizeof(struct m_hdr);
 	m->m_data = m->m_dat;
 	m->m_len = 0;
 	m->m_nextpkt = 0;
diff --git a/slirp/mbuf.h b/slirp/mbuf.h
index 1e8f7a8e4..f9f213255 100644
--- a/slirp/mbuf.h
+++ b/slirp/mbuf.h
@@ -135,7 +135,6 @@ extern struct mbuf m_freelist, m_usedlist;
 extern int mbuf_max;
 
 void m_init _P((void));
-void msize_init _P((void));
 struct mbuf * m_get _P((void));
 void m_free _P((struct mbuf *));
 void m_cat _P((register struct mbuf *, register struct mbuf *));
diff --git a/slirp/misc.c b/slirp/misc.c
index d40fd629f..755dfec94 100644
--- a/slirp/misc.c
+++ b/slirp/misc.c
@@ -8,8 +8,7 @@
 #define WANT_SYS_IOCTL_H
 #include <slirp.h>
 
-u_int curtime, time_fasttimo, last_slowtimo, detach_time;
-u_int detach_wait = 600000;	/* 10 minutes */
+u_int curtime, time_fasttimo, last_slowtimo;
 
 #if 0
 int x_port = -1;
@@ -214,10 +213,7 @@ strerror(error)
 #ifdef _WIN32
 
 int
-fork_exec(so, ex, do_pty)
-	struct socket *so;
-	char *ex;
-	int do_pty;
+fork_exec(struct socket *so, const char *ex, int do_pty)
 {
     /* not implemented */
     return 0;
@@ -225,6 +221,7 @@ fork_exec(so, ex, do_pty)
 
 #else
 
+#ifndef CONFIG_QEMU
 int
 slirp_openpty(amaster, aslave)
      int *amaster, *aslave;
@@ -289,6 +286,7 @@ slirp_openpty(amaster, aslave)
 	return (-1);
 #endif
 }
+#endif
 
 /*
  * XXX This is ugly
@@ -302,23 +300,20 @@ slirp_openpty(amaster, aslave)
  * do_ptr = 2   Fork/exec using pty
  */
 int
-fork_exec(so, ex, do_pty)
-	struct socket *so;
-	char *ex;
-	int do_pty;
+fork_exec(struct socket *so, const char *ex, int do_pty)
 {
 	int s;
 	struct sockaddr_in addr;
 	int addrlen = sizeof(addr);
 	int opt;
-        int master;
+        int master = -1;
 	char *argv[256];
 #if 0
 	char buff[256];
 #endif
 	/* don't want to clobber the original */
 	char *bptr;
-	char *curarg;
+	const char *curarg;
 	int c, i, ret;
 
 	DEBUG_CALL("fork_exec");
@@ -327,10 +322,12 @@ fork_exec(so, ex, do_pty)
 	DEBUG_ARG("do_pty = %lx", (long)do_pty);
 
 	if (do_pty == 2) {
+#if 0
 		if (slirp_openpty(&master, &s) == -1) {
 			lprint("Error: openpty failed: %s\n", strerror(errno));
 			return 0;
 		}
+#endif
 	} else {
 		addr.sin_family = AF_INET;
 		addr.sin_port = 0;
@@ -390,7 +387,7 @@ fork_exec(so, ex, do_pty)
 		dup2(s, 0);
 		dup2(s, 1);
 		dup2(s, 2);
-		for (s = 3; s <= 255; s++)
+		for (s = getdtablesize() - 1; s >= 3; s--)
 		   close(s);
 
 		i = 0;
diff --git a/slirp/misc.h b/slirp/misc.h
index 6484a8126..eee740575 100644
--- a/slirp/misc.h
+++ b/slirp/misc.h
@@ -12,12 +12,12 @@ struct ex_list {
 	int ex_pty;			/* Do we want a pty? */
 	int ex_addr;			/* The last byte of the address */
 	int ex_fport;                   /* Port to telnet to */
-	char *ex_exec;                  /* Command line of what to exec */
+	const char *ex_exec;            /* Command line of what to exec */
 	struct ex_list *ex_next;
 };
 
 extern struct ex_list *exec_list;
-extern u_int curtime, time_fasttimo, last_slowtimo, detach_time, detach_wait;
+extern u_int curtime, time_fasttimo, last_slowtimo;
 
 extern int (*lprint_print) _P((void *, const char *, va_list));
 extern char *lprint_ptr, *lprint_ptr2, **lprint_arg;
@@ -74,7 +74,7 @@ inline  void slirp_insque  _P((void *, void *));
 inline  void slirp_remque  _P((void *));
 int add_exec _P((struct ex_list **, int, char *, int, int));
 int slirp_openpty _P((int *, int *));
-int fork_exec _P((struct socket *, char *, int));
+int fork_exec(struct socket *so, const char *ex, int do_pty);
 void snooze_hup _P((int));
 void snooze _P((void));
 void relay _P((int));
diff --git a/slirp/sbuf.c b/slirp/sbuf.c
index 209064b1a..02c5fce0a 100644
--- a/slirp/sbuf.c
+++ b/slirp/sbuf.c
@@ -7,6 +7,8 @@
 
 #include <slirp.h>
 
+static void sbappendsb(struct sbuf *sb, struct mbuf *m);
+
 /* Done as a macro in socket.h */
 /* int
  * sbspace(struct sockbuff *sb)
@@ -133,10 +135,8 @@ sbappend(so, m)
  * Copy the data from m into sb
  * The caller is responsible to make sure there's enough room
  */
-void
-sbappendsb(sb, m)
-	 struct sbuf *sb;
-	 struct mbuf *m;
+static void
+sbappendsb(struct sbuf *sb, struct mbuf *m)
 {
 	int len, n,  nn;
 
diff --git a/slirp/sbuf.h b/slirp/sbuf.h
index 89c4eb2f1..a4f103623 100644
--- a/slirp/sbuf.h
+++ b/slirp/sbuf.h
@@ -25,7 +25,6 @@ void sbfree _P((struct sbuf *));
 void sbdrop _P((struct sbuf *, int));
 void sbreserve _P((struct sbuf *, int));
 void sbappend _P((struct socket *, struct mbuf *));
-void sbappendsb _P((struct sbuf *, struct mbuf *));
 void sbcopy _P((struct sbuf *, int, int, char *));
 
 #endif
diff --git a/slirp/slirp.c b/slirp/slirp.c
index 28f6c0cec..303f4825c 100644
--- a/slirp/slirp.c
+++ b/slirp/slirp.c
@@ -12,7 +12,7 @@ struct in_addr special_addr;
 /* virtual address alias for host */
 struct in_addr alias_addr;
 
-const uint8_t special_ethaddr[6] = {
+static const uint8_t special_ethaddr[6] = {
     0x52, 0x54, 0x00, 0x12, 0x35, 0x00
 };
 
@@ -130,7 +130,7 @@ static int get_dns_addr(struct in_addr *pdns_addr)
 #endif
 
 #ifdef _WIN32
-void slirp_cleanup(void)
+static void slirp_cleanup(void)
 {
     WSACleanup();
 }
diff --git a/slirp/slirp.h b/slirp/slirp.h
index ecff1d258..7b0e968f8 100644
--- a/slirp/slirp.h
+++ b/slirp/slirp.h
@@ -280,6 +280,9 @@ extern int do_echo;
 
 #define DEFAULT_BAUD 115200
 
+#define SO_OPTIONS DO_KEEPALIVE
+#define TCP_MAXIDLE (TCPTV_KEEPCNT * TCPTV_KEEPINTVL)
+
 /* cksum.c */
 int cksum(struct mbuf *m, int len);
 
@@ -290,10 +293,6 @@ void if_output _P((struct socket *, struct mbuf *));
 /* ip_input.c */
 void ip_init _P((void));
 void ip_input _P((struct mbuf *));
-struct ip * ip_reass _P((register struct ipasfrag *, register struct ipq *));
-void ip_freef _P((struct ipq *));
-void ip_enq _P((register struct ipasfrag *, register struct ipasfrag *));
-void ip_deq _P((register struct ipasfrag *));
 void ip_slowtimo _P((void));
 void ip_stripoptions _P((register struct mbuf *, struct mbuf *));
 
@@ -301,10 +300,7 @@ void ip_stripoptions _P((register struct mbuf *, struct mbuf *));
 int ip_output _P((struct socket *, struct mbuf *));
 
 /* tcp_input.c */
-int tcp_reass _P((register struct tcpcb *, register struct tcpiphdr *, struct mbuf *));
 void tcp_input _P((register struct mbuf *, int, struct socket *));
-void tcp_dooptions _P((struct tcpcb *, u_char *, int, struct tcpiphdr *));
-void tcp_xmit_timer _P((register struct tcpcb *, int));
 int tcp_mss _P((register struct tcpcb *, u_int));
 
 /* tcp_output.c */
@@ -317,7 +313,6 @@ void tcp_template _P((struct tcpcb *));
 void tcp_respond _P((struct tcpcb *, register struct tcpiphdr *, register struct mbuf *, tcp_seq, tcp_seq, int));
 struct tcpcb * tcp_newtcpcb _P((struct socket *));
 struct tcpcb * tcp_close _P((register struct tcpcb *));
-void tcp_drain _P((void));
 void tcp_sockclosed _P((struct tcpcb *));
 int tcp_fconnect _P((struct socket *));
 void tcp_connect _P((struct socket *));
diff --git a/slirp/socket.c b/slirp/socket.c
index 7e07cf894..0c15132ea 100644
--- a/slirp/socket.c
+++ b/slirp/socket.c
@@ -13,12 +13,16 @@
 #include <sys/filio.h>
 #endif
 
-void
+static void sofcantrcvmore(struct socket *so);
+static void sofcantsendmore(struct socket *so);
+
+#if 0
+static void
 so_init()
 {
 	/* Nothing yet */
 }
-
+#endif
 
 struct socket *
 solookup(head, laddr, lport, faddr, fport)
@@ -421,7 +425,7 @@ sorecvfrom(so)
 	  int len, n;
 
 	  if (!(m = m_get())) return;
-	  m->m_data += if_maxlinkhdr;
+	  m->m_data += IF_MAXLINKHDR;
 
 	  /*
 	   * XXX Shouldn't FIONREAD packets destined for port 53,
@@ -604,12 +608,13 @@ solisten(port, laddr, lport, flags)
 	return so;
 }
 
+#if 0
 /*
  * Data is available in so_rcv
  * Just write() the data to the socket
  * XXX not yet...
  */
-void
+static void
 sorwakeup(so)
 	struct socket *so;
 {
@@ -622,12 +627,13 @@ sorwakeup(so)
  * We have room for a read() if we want to
  * For now, don't read, it'll be done in the main loop
  */
-void
+static void
 sowwakeup(so)
 	struct socket *so;
 {
 	/* Nothing, yet */
 }
+#endif
 
 /*
  * Various session state calls
@@ -652,9 +658,8 @@ soisfconnected(so)
 	so->so_state |= SS_ISFCONNECTED; /* Clobber other states */
 }
 
-void
-sofcantrcvmore(so)
-	struct  socket *so;
+static void
+sofcantrcvmore(struct socket *so)
 {
 	if ((so->so_state & SS_NOFDREF) == 0) {
 		shutdown(so->s,0);
@@ -669,9 +674,8 @@ sofcantrcvmore(so)
 	   so->so_state |= SS_FCANTRCVMORE;
 }
 
-void
-sofcantsendmore(so)
-	struct socket *so;
+static void
+sofcantsendmore(struct socket *so)
 {
 	if ((so->so_state & SS_NOFDREF) == 0) {
             shutdown(so->s,1);           /* send FIN to fhost */
diff --git a/slirp/socket.h b/slirp/socket.h
index 99cc17f32..94fb8d8cf 100644
--- a/slirp/socket.h
+++ b/slirp/socket.h
@@ -81,7 +81,6 @@ struct iovec {
 };
 #endif
 
-void so_init _P((void));
 struct socket * solookup _P((struct socket *, struct in_addr, u_int, struct in_addr, u_int));
 struct socket * socreate _P((void));
 void sofree _P((struct socket *));
@@ -92,12 +91,8 @@ int sowrite _P((struct socket *));
 void sorecvfrom _P((struct socket *));
 int sosendto _P((struct socket *, struct mbuf *));
 struct socket * solisten _P((u_int, u_int32_t, u_int, int));
-void sorwakeup _P((struct socket *));
-void sowwakeup _P((struct socket *));
 void soisfconnecting _P((register struct socket *));
 void soisfconnected _P((register struct socket *));
-void sofcantrcvmore _P((struct  socket *));
-void sofcantsendmore _P((struct socket *));
 void soisfdisconnected _P((struct socket *));
 void sofwdrain _P((struct socket *));
 
diff --git a/slirp/tcp.h b/slirp/tcp.h
index 229293c49..11150766d 100644
--- a/slirp/tcp.h
+++ b/slirp/tcp.h
@@ -42,8 +42,6 @@ typedef	u_int32_t	tcp_seq;
 #define      PR_SLOWHZ       2               /* 2 slow timeouts per second (approx) */
 #define      PR_FASTHZ       5               /* 5 fast timeouts per second (not important) */
 
-extern int tcp_rcvspace;
-extern int tcp_sndspace;
 extern struct socket *tcp_last_so;
 
 #define TCP_SNDSPACE 8192
@@ -172,6 +170,6 @@ struct tcphdr {
 
 extern tcp_seq tcp_iss;                /* tcp initial send seq # */
 
-extern char *tcpstates[];
+extern const char * const tcpstates[];
 
 #endif
diff --git a/slirp/tcp_input.c b/slirp/tcp_input.c
index abd827ebb..17a9387f0 100644
--- a/slirp/tcp_input.c
+++ b/slirp/tcp_input.c
@@ -47,7 +47,7 @@
 
 struct socket tcb;
 
-int	tcprexmtthresh = 3;
+#define	TCPREXMTTHRESH 3
 struct	socket *tcp_last_so = &tcb;
 
 tcp_seq tcp_iss;                /* tcp initial send seq # */
@@ -112,12 +112,13 @@ tcp_seq tcp_iss;                /* tcp initial send seq # */
 	} \
 }
 #endif
+static void tcp_dooptions(struct tcpcb *tp, u_char *cp, int cnt,
+                          struct tcpiphdr *ti);
+static void tcp_xmit_timer(register struct tcpcb *tp, int rtt);
 
-int
-tcp_reass(tp, ti, m)
-	register struct tcpcb *tp;
-	register struct tcpiphdr *ti;
-	struct mbuf *m;
+static int
+tcp_reass(register struct tcpcb *tp, register struct tcpiphdr *ti,
+          struct mbuf *m)
 {
 	register struct tcpiphdr *q;
 	struct socket *so = tp->t_socket;
@@ -402,8 +403,8 @@ findso:
 	    goto dropwithreset;
 	  }
 
-	  sbreserve(&so->so_snd, tcp_sndspace);
-	  sbreserve(&so->so_rcv, tcp_rcvspace);
+	  sbreserve(&so->so_snd, TCP_SNDSPACE);
+	  sbreserve(&so->so_rcv, TCP_RCVSPACE);
 
 	  /*		tcp_last_so = so; */  /* XXX ? */
 	  /*		tp = sototcpcb(so);    */
@@ -448,10 +449,10 @@ findso:
 	 * Reset idle time and keep-alive timer.
 	 */
 	tp->t_idle = 0;
-	if (so_options)
-	   tp->t_timer[TCPT_KEEP] = tcp_keepintvl;
+	if (SO_OPTIONS)
+	   tp->t_timer[TCPT_KEEP] = TCPTV_KEEPINTVL;
 	else
-	   tp->t_timer[TCPT_KEEP] = tcp_keepidle;
+	   tp->t_timer[TCPT_KEEP] = TCPTV_KEEP_IDLE;
 
 	/*
 	 * Process options if not in LISTEN state,
@@ -1102,7 +1103,7 @@ trimthenstep6:
 				if (tp->t_timer[TCPT_REXMT] == 0 ||
 				    ti->ti_ack != tp->snd_una)
 					tp->t_dupacks = 0;
-				else if (++tp->t_dupacks == tcprexmtthresh) {
+				else if (++tp->t_dupacks == TCPREXMTTHRESH) {
 					tcp_seq onxt = tp->snd_nxt;
 					u_int win =
 					    min(tp->snd_wnd, tp->snd_cwnd) / 2 /
@@ -1121,7 +1122,7 @@ trimthenstep6:
 					if (SEQ_GT(onxt, tp->snd_nxt))
 						tp->snd_nxt = onxt;
 					goto drop;
-				} else if (tp->t_dupacks > tcprexmtthresh) {
+				} else if (tp->t_dupacks > TCPREXMTTHRESH) {
 					tp->snd_cwnd += tp->t_maxseg;
 					(void) tcp_output(tp);
 					goto drop;
@@ -1135,7 +1136,7 @@ trimthenstep6:
 		 * If the congestion window was inflated to account
 		 * for the other side's cached packets, retract it.
 		 */
-		if (tp->t_dupacks > tcprexmtthresh &&
+		if (tp->t_dupacks > TCPREXMTTHRESH &&
 		    tp->snd_cwnd > tp->snd_ssthresh)
 			tp->snd_cwnd = tp->snd_ssthresh;
 		tp->t_dupacks = 0;
@@ -1227,7 +1228,7 @@ trimthenstep6:
 				 */
 				if (so->so_state & SS_FCANTRCVMORE) {
 					soisfdisconnected(so);
-					tp->t_timer[TCPT_2MSL] = tcp_maxidle;
+					tp->t_timer[TCPT_2MSL] = TCP_MAXIDLE;
 				}
 				tp->t_state = TCPS_FIN_WAIT_2;
 			}
@@ -1490,12 +1491,8 @@ drop:
 /*	int *ts_present;
  *	u_int32_t *ts_val, *ts_ecr;
  */
-void
-tcp_dooptions(tp, cp, cnt, ti)
-	struct tcpcb *tp;
-	u_char *cp;
-	int cnt;
-	struct tcpiphdr *ti;
+static void
+tcp_dooptions(struct tcpcb *tp, u_char *cp, int cnt, struct tcpiphdr *ti)
 {
 	u_int16_t mss;
 	int opt, optlen;
@@ -1605,10 +1602,8 @@ tcp_pulloutofband(so, ti, m)
  * and update averages and current timeout.
  */
 
-void
-tcp_xmit_timer(tp, rtt)
-	register struct tcpcb *tp;
-	int rtt;
+static void
+tcp_xmit_timer(register struct tcpcb *tp, int rtt)
 {
 	register short delta;
 
@@ -1707,7 +1702,7 @@ tcp_mss(tp, offer)
 	DEBUG_ARG("tp = %lx", (long)tp);
 	DEBUG_ARG("offer = %d", offer);
 
-	mss = min(if_mtu, if_mru) - sizeof(struct tcpiphdr);
+	mss = min(IF_MTU, IF_MRU) - sizeof(struct tcpiphdr);
 	if (offer)
 		mss = min(mss, offer);
 	mss = max(mss, 32);
@@ -1716,8 +1711,12 @@ tcp_mss(tp, offer)
 
 	tp->snd_cwnd = mss;
 
-	sbreserve(&so->so_snd, tcp_sndspace+((tcp_sndspace%mss)?(mss-(tcp_sndspace%mss)):0));
-	sbreserve(&so->so_rcv, tcp_rcvspace+((tcp_rcvspace%mss)?(mss-(tcp_rcvspace%mss)):0));
+	sbreserve(&so->so_snd, TCP_SNDSPACE + ((TCP_SNDSPACE % mss) ?
+                                               (mss - (TCP_SNDSPACE % mss)) :
+                                               0));
+	sbreserve(&so->so_rcv, TCP_RCVSPACE + ((TCP_RCVSPACE % mss) ?
+                                               (mss - (TCP_RCVSPACE % mss)) :
+                                               0));
 
 	DEBUG_MISC((dfd, " returning mss = %d\n", mss));
 
diff --git a/slirp/tcp_output.c b/slirp/tcp_output.c
index f4986516a..dba4ed7a5 100644
--- a/slirp/tcp_output.c
+++ b/slirp/tcp_output.c
@@ -48,14 +48,14 @@
  * Since this is only used in "stats socket", we give meaning
  * names instead of the REAL names
  */
-char *tcpstates[] = {
+const char * const tcpstates[] = {
 /*	"CLOSED",       "LISTEN",       "SYN_SENT",     "SYN_RCVD", */
 	"REDIRECT",	"LISTEN",	"SYN_SENT",     "SYN_RCVD",
 	"ESTABLISHED",  "CLOSE_WAIT",   "FIN_WAIT_1",   "CLOSING",
 	"LAST_ACK",     "FIN_WAIT_2",   "TIME_WAIT",
 };
 
-u_char  tcp_outflags[TCP_NSTATES] = {
+static const u_char  tcp_outflags[TCP_NSTATES] = {
 	TH_RST|TH_ACK, 0,      TH_SYN,        TH_SYN|TH_ACK,
 	TH_ACK,        TH_ACK, TH_FIN|TH_ACK, TH_FIN|TH_ACK,
 	TH_FIN|TH_ACK, TH_ACK, TH_ACK,
@@ -354,7 +354,7 @@ send:
 			error = 1;
 			goto out;
 		}
-		m->m_data += if_maxlinkhdr;
+		m->m_data += IF_MAXLINKHDR;
 		m->m_len = hdrlen;
 
 		/*
@@ -396,7 +396,7 @@ send:
 			error = 1;
 			goto out;
 		}
-		m->m_data += if_maxlinkhdr;
+		m->m_data += IF_MAXLINKHDR;
 		m->m_len = hdrlen;
 	}
 
@@ -536,7 +536,7 @@ send:
 
 	((struct ip *)ti)->ip_len = m->m_len;
 
-	((struct ip *)ti)->ip_ttl = ip_defttl;
+	((struct ip *)ti)->ip_ttl = IPDEFTTL;
 	((struct ip *)ti)->ip_tos = so->so_iptos;
 
 /* #if BSD >= 43 */
diff --git a/slirp/tcp_subr.c b/slirp/tcp_subr.c
index a20a0880b..d5ba21f17 100644
--- a/slirp/tcp_subr.c
+++ b/slirp/tcp_subr.c
@@ -46,11 +46,8 @@
 #include <slirp.h>
 
 /* patchable/settable parameters for tcp */
-int 	tcp_mssdflt = TCP_MSS;
-int 	tcp_rttdflt = TCPTV_SRTTDFLT / PR_SLOWHZ;
-int	tcp_do_rfc1323 = 0;	/* Don't do rfc1323 performance enhancements */
-int	tcp_rcvspace;	/* You may want to change this */
-int	tcp_sndspace;	/* Keep small if you have an error prone link */
+/* Don't do rfc1323 performance enhancements */
+#define TCP_DO_RFC1323 0
 
 /*
  * Tcp initialization
@@ -60,14 +57,6 @@ tcp_init()
 {
 	tcp_iss = 1;		/* wrong */
 	tcb.so_next = tcb.so_prev = &tcb;
-
-	/* tcp_rcvspace = our Window we advertise to the remote */
-	tcp_rcvspace = TCP_RCVSPACE;
-	tcp_sndspace = TCP_SNDSPACE;
-
-	/* Make sure tcp_sndspace is at least 2*MSS */
-	if (tcp_sndspace < 2*(min(if_mtu, if_mru) - sizeof(struct tcpiphdr)))
-		tcp_sndspace = 2*(min(if_mtu, if_mru) - sizeof(struct tcpiphdr));
 }
 
 /*
@@ -145,7 +134,7 @@ tcp_respond(tp, ti, m, ack, seq, flags)
 #else
 		tlen = 0;
 #endif
-		m->m_data += if_maxlinkhdr;
+		m->m_data += IF_MAXLINKHDR;
 		*mtod(m, struct tcpiphdr *) = *ti;
 		ti = mtod(m, struct tcpiphdr *);
 		flags = TH_ACK;
@@ -186,7 +175,7 @@ tcp_respond(tp, ti, m, ack, seq, flags)
 	if(flags & TH_RST)
 	  ((struct ip *)ti)->ip_ttl = MAXTTL;
 	else
-	  ((struct ip *)ti)->ip_ttl = ip_defttl;
+	  ((struct ip *)ti)->ip_ttl = IPDEFTTL;
 
 	(void) ip_output((struct socket *)0, m);
 }
@@ -208,9 +197,9 @@ tcp_newtcpcb(so)
 
 	memset((char *) tp, 0, sizeof(struct tcpcb));
 	tp->seg_next = tp->seg_prev = (tcpiphdrp_32)tp;
-	tp->t_maxseg = tcp_mssdflt;
+	tp->t_maxseg = TCP_MSS;
 
-	tp->t_flags = tcp_do_rfc1323 ? (TF_REQ_SCALE|TF_REQ_TSTMP) : 0;
+	tp->t_flags = TCP_DO_RFC1323 ? (TF_REQ_SCALE|TF_REQ_TSTMP) : 0;
 	tp->t_socket = so;
 
 	/*
@@ -219,7 +208,7 @@ tcp_newtcpcb(so)
 	 * reasonable initial retransmit time.
 	 */
 	tp->t_srtt = TCPTV_SRTTBASE;
-	tp->t_rttvar = tcp_rttdflt * PR_SLOWHZ << 2;
+	tp->t_rttvar = TCPTV_SRTTDFLT << 2;
 	tp->t_rttmin = TCPTV_MIN;
 
 	TCPT_RANGESET(tp->t_rxtcur,
@@ -309,6 +298,7 @@ tcp_close(tp)
 	return ((struct tcpcb *)0);
 }
 
+#ifdef notdef
 void
 tcp_drain()
 {
@@ -319,9 +309,6 @@ tcp_drain()
  * When a source quench is received, close congestion window
  * to one segment.  We will gradually open it again as we proceed.
  */
-
-#ifdef notdef
-
 void
 tcp_quench(i, errno)
 
@@ -556,7 +543,7 @@ tcp_attach(so)
 /*
  * Set the socket's type of service field
  */
-struct tos_t tcptos[] = {
+static const struct tos_t tcptos[] = {
 	  {0, 20, IPTOS_THROUGHPUT, 0},	/* ftp data */
 	  {21, 21, IPTOS_LOWDELAY,  EMU_FTP},	/* ftp control */
 	  {0, 23, IPTOS_LOWDELAY, 0},	/* telnet */
@@ -572,7 +559,7 @@ struct tos_t tcptos[] = {
 	  {0, 0, 0, 0}
 };
 
-struct emu_t *tcpemu = 0;
+static struct emu_t *tcpemu = 0;
 
 /*
  * Return TOS according to the above table
@@ -665,7 +652,7 @@ tcp_emu(so, m)
 			so_rcv->sb_rptr += m->m_len;
 			m->m_data[m->m_len] = 0; /* NULL terminate */
 			if (strchr(m->m_data, '\r') || strchr(m->m_data, '\n')) {
-				if (sscanf(so_rcv->sb_data, "%d%*[ ,]%d", &n1, &n2) == 2) {
+				if (sscanf(so_rcv->sb_data, "%u%*[ ,]%u", &n1, &n2) == 2) {
 					HTONS(n1);
 					HTONS(n2);
 					/* n2 is the one on our host */
@@ -991,7 +978,7 @@ do_prompt:
 			/*
 			 * Need to emulate the PORT command
 			 */
-			x = sscanf(bptr, "ORT %d,%d,%d,%d,%d,%d\r\n%256[^\177]",
+			x = sscanf(bptr, "ORT %u,%u,%u,%u,%u,%u\r\n%256[^\177]",
 				   &n1, &n2, &n3, &n4, &n5, &n6, buff);
 			if (x < 6)
 			   return 1;
@@ -1022,7 +1009,7 @@ do_prompt:
 			/*
 			 * Need to emulate the PASV response
 			 */
-			x = sscanf(bptr, "27 Entering Passive Mode (%d,%d,%d,%d,%d,%d)\r\n%256[^\177]",
+			x = sscanf(bptr, "27 Entering Passive Mode (%u,%u,%u,%u,%u,%u)\r\n%256[^\177]",
 				   &n1, &n2, &n3, &n4, &n5, &n6, buff);
 			if (x < 6)
 			   return 1;
diff --git a/slirp/tcp_timer.c b/slirp/tcp_timer.c
index 3e865977c..244bad6a8 100644
--- a/slirp/tcp_timer.c
+++ b/slirp/tcp_timer.c
@@ -36,17 +36,14 @@
 
 #include <slirp.h>
 
-int	tcp_keepidle = TCPTV_KEEP_IDLE;
-int	tcp_keepintvl = TCPTV_KEEPINTVL;
-int	tcp_maxidle;
-int	so_options = DO_KEEPALIVE;
-
 #ifdef LOG_ENABLED
 struct   tcpstat tcpstat;        /* tcp statistics */
 #endif
 
 u_int32_t        tcp_now;                /* for RFC 1323 timestamps */
 
+static struct tcpcb *tcp_timers(register struct tcpcb *tp, int timer);
+
 /*
  * Fast timeout routine for processing delayed acks
  */
@@ -84,7 +81,6 @@ tcp_slowtimo()
 
 	DEBUG_CALL("tcp_slowtimo");
 
-	tcp_maxidle = TCPTV_KEEPCNT * tcp_keepintvl;
 	/*
 	 * Search through tcb's and update active timers.
 	 */
@@ -130,16 +126,14 @@ tcp_canceltimers(tp)
 		tp->t_timer[i] = 0;
 }
 
-int	tcp_backoff[TCP_MAXRXTSHIFT + 1] =
+const int tcp_backoff[TCP_MAXRXTSHIFT + 1] =
    { 1, 2, 4, 8, 16, 32, 64, 64, 64, 64, 64, 64, 64 };
 
 /*
  * TCP timer processing.
  */
-struct tcpcb *
-tcp_timers(tp, timer)
-	register struct tcpcb *tp;
-	int timer;
+static struct tcpcb *
+tcp_timers(register struct tcpcb *tp, int timer)
 {
 	register int rexmt;
 
@@ -155,8 +149,8 @@ tcp_timers(tp, timer)
 	 */
 	case TCPT_2MSL:
 		if (tp->t_state != TCPS_TIME_WAIT &&
-		    tp->t_idle <= tcp_maxidle)
-			tp->t_timer[TCPT_2MSL] = tcp_keepintvl;
+		    tp->t_idle <= TCP_MAXIDLE)
+			tp->t_timer[TCPT_2MSL] = TCPTV_KEEPINTVL;
 		else
 			tp = tcp_close(tp);
 		break;
@@ -287,8 +281,8 @@ tcp_timers(tp, timer)
 			goto dropit;
 
 /*		if (tp->t_socket->so_options & SO_KEEPALIVE && */
-		if ((so_options) && tp->t_state <= TCPS_CLOSE_WAIT) {
-		    	if (tp->t_idle >= tcp_keepidle + tcp_maxidle)
+		if ((SO_OPTIONS) && tp->t_state <= TCPS_CLOSE_WAIT) {
+		    	if (tp->t_idle >= TCPTV_KEEP_IDLE + TCP_MAXIDLE)
 				goto dropit;
 			/*
 			 * Send a packet designed to force a response
@@ -314,9 +308,9 @@ tcp_timers(tp, timer)
 			tcp_respond(tp, &tp->t_template, (struct mbuf *)NULL,
 			    tp->rcv_nxt, tp->snd_una - 1, 0);
 #endif
-			tp->t_timer[TCPT_KEEP] = tcp_keepintvl;
+			tp->t_timer[TCPT_KEEP] = TCPTV_KEEPINTVL;
 		} else
-			tp->t_timer[TCPT_KEEP] = tcp_keepidle;
+			tp->t_timer[TCPT_KEEP] = TCPTV_KEEP_IDLE;
 		break;
 
 	dropit:
diff --git a/slirp/tcp_timer.h b/slirp/tcp_timer.h
index 59933bc1b..f251846b4 100644
--- a/slirp/tcp_timer.h
+++ b/slirp/tcp_timer.h
@@ -126,17 +126,12 @@ char *tcptimers[] =
 		(tv) = (tvmax); \
 }
 
-extern int tcp_keepidle;		/* time before keepalive probes begin */
-extern int tcp_keepintvl;		/* time between keepalive probes */
-extern int tcp_maxidle;			/* time to drop after starting probes */
-extern int tcp_ttl;			/* time to live for TCP segs */
-extern int tcp_backoff[];
+extern const int tcp_backoff[];
 
 struct tcpcb;
 
 void tcp_fasttimo _P((void));
 void tcp_slowtimo _P((void));
 void tcp_canceltimers _P((struct tcpcb *));
-struct tcpcb * tcp_timers _P((register struct tcpcb *, int));
 
 #endif
diff --git a/slirp/tftp.c b/slirp/tftp.c
index 2b2bf2c5a..562ae8953 100644
--- a/slirp/tftp.c
+++ b/slirp/tftp.c
@@ -34,7 +34,7 @@ struct tftp_session {
     int timestamp;
 };
 
-struct tftp_session tftp_sessions[TFTP_SESSIONS_MAX];
+static struct tftp_session tftp_sessions[TFTP_SESSIONS_MAX];
 
 const char *tftp_prefix;
 
@@ -143,7 +143,7 @@ static int tftp_send_oack(struct tftp_session *spt,
 
     memset(m->m_data, 0, m->m_size);
 
-    m->m_data += if_maxlinkhdr;
+    m->m_data += IF_MAXLINKHDR;
     tp = (void *)m->m_data;
     m->m_data += sizeof(struct udpiphdr);
 
@@ -183,7 +183,7 @@ static int tftp_send_error(struct tftp_session *spt,
 
   memset(m->m_data, 0, m->m_size);
 
-  m->m_data += if_maxlinkhdr;
+  m->m_data += IF_MAXLINKHDR;
   tp = (void *)m->m_data;
   m->m_data += sizeof(struct udpiphdr);
 
@@ -230,7 +230,7 @@ static int tftp_send_data(struct tftp_session *spt,
 
   memset(m->m_data, 0, m->m_size);
 
-  m->m_data += if_maxlinkhdr;
+  m->m_data += IF_MAXLINKHDR;
   tp = (void *)m->m_data;
   m->m_data += sizeof(struct udpiphdr);
 
diff --git a/slirp/udp.c b/slirp/udp.c
index 851038094..c48923b0c 100644
--- a/slirp/udp.c
+++ b/slirp/udp.c
@@ -51,14 +51,17 @@ struct udpstat udpstat;
 
 struct socket udb;
 
+static u_int8_t udp_tos(struct socket *so);
+static void udp_emu(struct socket *so, struct mbuf *m);
+
 /*
  * UDP protocol implementation.
  * Per RFC 768, August, 1980.
  */
 #ifndef	COMPAT_42
-int	udpcksum = 1;
+#define UDPCKSUM 1
 #else
-int	udpcksum = 0;		/* XXX */
+#define UDPCKSUM 0 /* XXX */
 #endif
 
 struct	socket *udp_last_so = &udb;
@@ -132,7 +135,7 @@ udp_input(m, iphlen)
 	/*
 	 * Checksum extended UDP header and data.
 	 */
-	if (udpcksum && uh->uh_sum) {
+	if (UDPCKSUM && uh->uh_sum) {
 	  ((struct ipovly *)ip)->ih_next = 0;
 	  ((struct ipovly *)ip)->ih_prev = 0;
 	  ((struct ipovly *)ip)->ih_x1 = 0;
@@ -292,13 +295,13 @@ int udp_output2(struct socket *so, struct mbuf *m,
 	 * Stuff checksum and output datagram.
 	 */
 	ui->ui_sum = 0;
-	if (udpcksum) {
+	if (UDPCKSUM) {
 	    if ((ui->ui_sum = cksum(m, /* sizeof (struct udpiphdr) + */ m->m_len)) == 0)
 		ui->ui_sum = 0xffff;
 	}
 	((struct ip *)ui)->ip_len = m->m_len;
 
-	((struct ip *)ui)->ip_ttl = ip_defttl;
+	((struct ip *)ui)->ip_ttl = IPDEFTTL;
 	((struct ip *)ui)->ip_tos = iptos;
 
 	STAT(udpstat.udps_opackets++);
@@ -369,7 +372,7 @@ udp_detach(so)
 	sofree(so);
 }
 
-struct tos_t udptos[] = {
+static const struct tos_t udptos[] = {
 	{0, 53, IPTOS_LOWDELAY, 0},			/* DNS */
 	{517, 517, IPTOS_LOWDELAY, EMU_TALK},	/* talk */
 	{518, 518, IPTOS_LOWDELAY, EMU_NTALK},	/* ntalk */
@@ -377,9 +380,8 @@ struct tos_t udptos[] = {
 	{0, 0, 0, 0}
 };
 
-u_int8_t
-udp_tos(so)
-	struct socket *so;
+static u_int8_t
+udp_tos(struct socket *so)
 {
 	int i = 0;
 
@@ -402,10 +404,8 @@ udp_tos(so)
 /*
  * Here, talk/ytalk/ntalk requests must be emulated
  */
-void
-udp_emu(so, m)
-	struct socket *so;
-	struct mbuf *m;
+static void
+udp_emu(struct socket *so, struct mbuf *m)
 {
 	struct sockaddr_in addr;
         int addrlen = sizeof(addr);
diff --git a/slirp/udp.h b/slirp/udp.h
index 12435eb82..4f69b098c 100644
--- a/slirp/udp.h
+++ b/slirp/udp.h
@@ -106,8 +106,6 @@ void udp_input _P((register struct mbuf *, int));
 int udp_output _P((struct socket *, struct mbuf *, struct sockaddr_in *));
 int udp_attach _P((struct socket *));
 void udp_detach _P((struct socket *));
-u_int8_t udp_tos _P((struct socket *));
-void udp_emu _P((struct socket *, struct mbuf *));
 struct socket * udp_listen _P((u_int, u_int32_t, u_int, int));
 int udp_output2(struct socket *so, struct mbuf *m,
                 struct sockaddr_in *saddr, struct sockaddr_in *daddr,