diff --git a/netstat.c b/netstat.c

index 847c0dc..8dd2f29 100644

--- a/netstat.c

+++ b/netstat.c

@@ -2061,7 +2061,7 @@ static void version(void)

 }

-static void usage(void)

+static void usage(int rc)

 {

     fprintf(stderr, _("usage: netstat [-vWeenNcCF] [<Af>] -r         netstat {-V|--version|-h|--help}\n"));

     fprintf(stderr, _("       netstat [-vWnNcaeol] [<Socket> ...]\n"));

@@ -2100,7 +2100,7 @@ static void usage(void)

     fprintf(stderr, _("  <AF>=Use '-6|-4' or '-A <af>' or '--<af>'; default: %s\n"), DFLT_AF);

     fprintf(stderr, _("  List of possible address families (which support routing):\n"));

     print_aflist(1); /* 1 = routeable */

-    exit(E_USAGE);

+    exit(rc);

 }

@@ -2292,20 +2292,21 @@ int main

 	    break;

 	case '?':

+	    usage(E_OPTERR);

 	case 'h':

-	    usage();

+	    usage(E_USAGE);

 	case 's':

 	    flag_sta++;

 	}

     if(argc == optind + 1) {

       if((reptimer = atoi(argv[optind])) <= 0)

-	usage();

+	usage(E_OPTERR);

       flag_cnt++;

     }

     if (flag_int + flag_rou + flag_mas + flag_sta > 1)

-	usage();

+	usage(E_OPTERR);

     if ((flag_inet || flag_inet6 || flag_sta) &&

         !(flag_tcp || flag_sctp || flag_udp || flag_udplite || flag_raw))

diff --git a/arp.c b/arp.c

index 5db71a7..30dd56d 100644

--- a/arp.c

+++ b/arp.c

@@ -93,7 +93,7 @@ struct hwtype *hw;		/* current hardware type        */

 int sockfd = 0;			/* active socket descriptor     */

 int hw_set = 0;			/* flag if hw-type was set (-H) */

 char device[16] = "";		/* current device               */

-static void usage(void);

+static void usage(int rc);

 /* Delete an entry from the ARP cache. */

 static int arp_del(char **args)

@@ -169,14 +169,14 @@ static int arp_del(char **args)

 	}

 	if (!strcmp(*args, "dev")) {

 	    if (*++args == NULL)

-		usage();

+		usage(E_OPTERR);

 	    safe_strncpy(device, *args, sizeof(device));

 	    args++;

 	    continue;

 	}

 	if (!strcmp(*args, "netmask")) {

 	    if (*++args == NULL)

-		usage();

+		usage(E_OPTERR);

 	    if (strcmp(*args, "255.255.255.255") != 0) {

 		safe_strncpy(host, *args, (sizeof host));

 		if (ap->input(0, host, sa) < 0) {

@@ -190,7 +190,7 @@ static int arp_del(char **args)

 	    args++;

 	    continue;

 	}

-	usage();

+	usage(E_OPTERR);

     }

     // if neighter priv nor pub is given, work on both

@@ -346,14 +346,14 @@ static int arp_set(char **args)

 	}

 	if (!strcmp(*args, "dev")) {

 	    if (*++args == NULL)

-		usage();

+		usage(E_OPTERR);

 	    safe_strncpy(device, *args, sizeof(device));

 	    args++;

 	    continue;

 	}

 	if (!strcmp(*args, "netmask")) {

 	    if (*++args == NULL)

-		usage();

+		usage(E_OPTERR);

 	    if (strcmp(*args, "255.255.255.255") != 0) {

 		safe_strncpy(host, *args, (sizeof host));

 		if (ap->input(0, host, sa) < 0) {

@@ -367,7 +367,7 @@ static int arp_set(char **args)

 	    args++;

 	    continue;

 	}

-	usage();

+	usage(E_OPTERR);

     }

     /* Fill in the remainder of the request. */

@@ -621,7 +621,7 @@ static void version(void)

     exit(E_VERSION);

 }

-static void usage(void)

+static void usage(int rc)

 {

     fprintf(stderr, _("Usage:\n  arp [-vn]  [<HW>] [-i <if>] [-a] [<hostname>]             <-Display ARP cache\n"));

     fprintf(stderr, _("  arp [-v]          [-i <if>] -d  <host> [pub]               <-Delete ARP entry\n"));

@@ -643,7 +643,7 @@ static void usage(void)

     fprintf(stderr, _("  <HW>=Use '-H <hw>' to specify hardware address type. Default: %s\n"), DFLT_HW);

     fprintf(stderr, _("  List of possible hardware types (which support ARP):\n"));

     print_hwlist(1); /* 1 = ARPable */

-    exit(E_USAGE);

+    exit(rc);

 }

 int main(int argc, char **argv)

@@ -745,10 +745,11 @@ int main(int argc, char **argv)

 	case 'V':

 	    version();

-	case '?':

 	case 'h':

+	    usage(E_USAGE);

+	case '?':

 	default:

-	    usage();

+	    usage(E_OPTERR);

 	}

     if (ap->af != AF_INET) {

@@ -797,7 +798,7 @@ int main(int argc, char **argv)

 	break;

     default:

-	usage();

+	usage(E_OPTERR);

     }

     exit(what);

diff --git a/ipmaddr.c b/ipmaddr.c

index e4ed41d..c45b62a 100644

--- a/ipmaddr.c

+++ b/ipmaddr.c

@@ -53,14 +53,14 @@ static void version(void)

 	exit(E_VERSION);

 }

-static void usage(void) __attribute__((noreturn));

+static void usage(int rc) __attribute__((noreturn));

-static void usage(void)

+static void usage(int rc)

 {

 	fprintf(stderr, _("Usage: ipmaddr [ add | del ] MULTIADDR dev STRING\n"));

 	fprintf(stderr, _("       ipmaddr show [ dev STRING ] [ ipv4 | ipv6 | link | all ]\n"));

 	fprintf(stderr, _("       ipmaddr -V | -version\n"));

-	exit(E_USAGE);

+	exit(rc);

 }

 static void print_lla(FILE *fp, int len, unsigned char *addr)

@@ -294,7 +294,7 @@ static int multiaddr_list(int argc, char **argv)

 			NEXT_ARG();

 			l = strlen(*argv);

 			if (l <= 0 || l >= sizeof(filter_dev))

-				usage();

+				usage(E_OPTERR);

 			strncpy(filter_dev, *argv, sizeof (filter_dev));

 		} else if (strcmp(*argv, "all") == 0) {

 			filter_family = AF_UNSPEC;

@@ -307,7 +307,7 @@ static int multiaddr_list(int argc, char **argv)

 		} else {

 			l = strlen(*argv);

 			if (l <= 0 || l >= sizeof(filter_dev))

-				usage();

+				usage(E_OPTERR);

 			strncpy(filter_dev, *argv, sizeof (filter_dev));

 		}

 		argv++; argc--;

@@ -339,18 +339,18 @@ int multiaddr_modify(int cmd, int argc, char **argv)

 		if (strcmp(*argv, "dev") == 0) {

 			NEXT_ARG();

 			if (ifr.ifr_name[0])

-				usage();

+				usage(E_OPTERR);

 			strncpy(ifr.ifr_name, *argv, IFNAMSIZ);

 		} else {

 			if (ifr.ifr_hwaddr.sa_data[0])

-				usage();

+				usage(E_OPTERR);

 			if (parse_lla(*argv, ifr.ifr_hwaddr.sa_data) < 0)

-				usage();

+				usage(E_OPTERR);

 		}

 		argc--; argv++;

 	}

 	if (ifr.ifr_name[0] == 0)

-		usage();

+		usage(E_OPTERR);

 	fd = socket(AF_INET, SOCK_DGRAM, 0);

 	if (fd < 0) {

@@ -378,7 +378,7 @@ int do_multiaddr(int argc, char **argv)

 	if (matches(*argv, "list") == 0 || matches(*argv, "show") == 0

 	    || matches(*argv, "lst") == 0)

 		return multiaddr_list(argc-1, argv+1);

-	usage();

+	usage(E_OPTERR);

 }

 int preferred_family = AF_UNSPEC;

@@ -408,13 +408,13 @@ int main(int argc, char **argv)

 			argc--;

 			argv++;

 			if (argc <= 1)

-				usage();

+				usage(E_OPTERR);

 			if (strcmp(argv[1], "inet") == 0)

 				preferred_family = AF_INET;

 			else if (strcmp(argv[1], "inet6") == 0)

 				preferred_family = AF_INET6;

 			else

-				usage();

+				usage(E_OPTERR);

 		} else if (matches(argv[1], "-stats") == 0 ||

 			   matches(argv[1], "-statistics") == 0) {

 			++show_stats;

@@ -423,7 +423,7 @@ int main(int argc, char **argv)

 		} else if ((matches(argv[1], "-V") == 0) || matches(argv[1], "--version") == 0) {

 			version();

 		} else

-			usage();

+			usage(E_OPTERR);

 		argc--;	argv++;

 	}

diff --git a/include/util-ank.h b/include/util-ank.h

index c8fcd08..c78604a 100644

--- a/include/util-ank.h

+++ b/include/util-ank.h

@@ -23,7 +23,7 @@ extern int resolve_hosts;

 #define NEXT_ARG() \

 argv++; \

 if (--argc <= 0) \

-	usage();

+	usage(E_OPTERR);

 typedef struct

 {

diff --git a/iptunnel.c b/iptunnel.c

index 2215d68..42b2a9e 100644

--- a/iptunnel.c

+++ b/iptunnel.c

@@ -76,9 +76,9 @@ static void version(void)

 	exit(E_VERSION);

 }

-static void usage(void) __attribute__((noreturn));

+static void usage(int rc) __attribute__((noreturn));

-static void usage(void)

+static void usage(int rc)

 {

 	fprintf(stderr, _("Usage: iptunnel { add | change | del | show } [ NAME ]\n"));

 	fprintf(stderr, _("          [ mode { ipip | gre | sit } ] [ remote ADDR ] [ local ADDR ]\n"));

@@ -90,7 +90,7 @@ static void usage(void)

 	fprintf(stderr, _("       TOS  := { NUMBER | inherit }\n"));

 	fprintf(stderr, _("       TTL  := { 1..255 | inherit }\n"));

 	fprintf(stderr, _("       KEY  := { DOTTED_QUAD | NUMBER }\n"));

-	exit(E_USAGE);

+	exit(rc);

 }

 static int do_ioctl_get_ifindex(char *dev)

@@ -217,18 +217,18 @@ static int parse_args(int argc, char **argv, struct ip_tunnel_parm *p)

 			NEXT_ARG();

 			if (strcmp(*argv, "ipip") == 0) {

 				if (p->iph.protocol)

-					usage();

+					usage(E_OPTERR);

 				p->iph.protocol = IPPROTO_IPIP;

 			} else if (strcmp(*argv, "gre") == 0) {

 				if (p->iph.protocol)

-					usage();

+					usage(E_OPTERR);

 				p->iph.protocol = IPPROTO_GRE;

 			} else if (strcmp(*argv, "sit") == 0) {

 				if (p->iph.protocol)

-					usage();

+					usage(E_OPTERR);

 				p->iph.protocol = IPPROTO_IPV6;

 			} else

-				usage();

+				usage(E_OPTERR);

 		} else if (strcmp(*argv, "key") == 0) {

 			unsigned uval;

 			NEXT_ARG();

@@ -238,7 +238,7 @@ static int parse_args(int argc, char **argv, struct ip_tunnel_parm *p)

 				p->i_key = p->o_key = get_addr32(*argv);

 			else {

 				if (scan_number(*argv, &uval)<0)

-					usage();

+					usage(E_OPTERR);

 				p->i_key = p->o_key = htonl(uval);

 			}

 		} else if (strcmp(*argv, "ikey") == 0) {

@@ -249,7 +249,7 @@ static int parse_args(int argc, char **argv, struct ip_tunnel_parm *p)

 				p->o_key = get_addr32(*argv);

 			else {

 				if (scan_number(*argv, &uval)<0)

-					usage();

+					usage(E_OPTERR);

 				p->i_key = htonl(uval);

 			}

 		} else if (strcmp(*argv, "okey") == 0) {

@@ -260,7 +260,7 @@ static int parse_args(int argc, char **argv, struct ip_tunnel_parm *p)

 				p->o_key = get_addr32(*argv);

 			else {

 				if (scan_number(*argv, &uval)<0)

-					usage();

+					usage(E_OPTERR);

 				p->o_key = htonl(uval);

 			}

 		} else if (strcmp(*argv, "seq") == 0) {

@@ -295,9 +295,9 @@ static int parse_args(int argc, char **argv, struct ip_tunnel_parm *p)

 			NEXT_ARG();

 			if (strcmp(*argv, "inherit") != 0) {

 				if (scan_number(*argv, &uval)<0)

-					usage();

+					usage(E_OPTERR);

 				if (uval > 255)

-					usage();

+					usage(E_OPTERR);

 				p->iph.ttl = uval;

 			}

 		} else if (strcmp(*argv, "tos") == 0) {

@@ -305,15 +305,15 @@ static int parse_args(int argc, char **argv, struct ip_tunnel_parm *p)

 			NEXT_ARG();

 			if (strcmp(*argv, "inherit") != 0) {

 				if (scan_number(*argv, &uval)<0)

-					usage();

+					usage(E_OPTERR);

 				if (uval > 255)

-					usage();

+					usage(E_OPTERR);

 				p->iph.tos = uval;

 			} else

 				p->iph.tos = 1;

 		} else {

 			if (p->name[0])

-				usage();

+				usage(E_OPTERR);

 			safe_strncpy(p->name, *argv, IFNAMSIZ);

 		}

 		argc--; argv++;

@@ -574,7 +574,7 @@ int do_iptunnel(int argc, char **argv)

 	} else

 		return do_show(0, NULL);

-	usage();

+	usage(E_OPTERR);

 }

@@ -605,13 +605,13 @@ int main(int argc, char **argv)

 			argc--;

 			argv++;

 			if (argc <= 1)

-				usage();

+				usage(E_OPTERR);

 			if (strcmp(argv[1], "inet") == 0)

 				preferred_family = AF_INET;

 			else if (strcmp(argv[1], "inet6") == 0)

 				preferred_family = AF_INET6;

 			else

-				usage();

+				usage(E_OPTERR);

 		} else if (matches(argv[1], "-stats") == 0 ||

 			   matches(argv[1], "-statistics") == 0) {

 			++show_stats;

@@ -620,7 +620,7 @@ int main(int argc, char **argv)

 		} else if ((matches(argv[1], "-V") == 0) || (matches(argv[1], "--version") == 0)) {

 			version();

 		} else

-			usage();

+			usage(E_OPTERR);

 		argc--;	argv++;

 	}

diff --git a/nameif.c b/nameif.c

index b280e59..13e3033 100644

--- a/nameif.c

+++ b/nameif.c

@@ -192,10 +192,10 @@ struct option lopt[] = {

 	{NULL},

 };

-void usage(void)

+void usage(int rc)

 {

 	fprintf(stderr, _("usage: nameif [-c configurationfile] [-s] {ifname macaddress}\n"));

-	exit(E_USAGE);

+	exit(rc);

 }

 int main(int ac, char **av)

@@ -214,7 +214,7 @@ int main(int ac, char **av)

 		switch (c) {

 		default:

 		case '?':

-			usage();

+			usage(E_OPTERR);

 		case 'c':

 			fname = optarg;

 			break;

@@ -232,7 +232,7 @@ int main(int ac, char **av)

 		char pos[30];

 		if ((ac-optind) & 1)

-			usage();

+			usage(E_OPTERR);

 		if (strlen(av[optind])+1>IFNAMSIZ)

 			complain(_("interface name `%s' too long"), av[optind]);

 		safe_strncpy(ch->ifname, av[optind], sizeof(ch->ifname));

diff --git a/plipconfig.c b/plipconfig.c

index 86fa890..1caeed3 100644

--- a/plipconfig.c

+++ b/plipconfig.c

@@ -57,12 +57,12 @@ static void version(void)

     exit(E_VERSION);

 }

-void usage(void)

+void usage(int rc)

 {

     fprintf(stderr, _("Usage: plipconfig interface [nibble NN] [trigger NN]\n"));

     fprintf(stderr, _("       plipconfig -V | --version\n"));

     fprintf(stderr, _("       plipconfig -h | --help\n"));

-    exit(E_USAGE);

+    exit(rc);

 }

 void print_plip(void)

@@ -89,16 +89,18 @@ int main(int argc, char **argv)

     argc--;

     argv++;

     while (argv[0] && *argv[0] == '-') {

-	if (!strcmp(*argv, "-V") || !strcmp(*argv, "--version"))

+	if ((!strcmp(*argv, "-V") || !strcmp(*argv, "--version")) && argc==1)

 	    version();

+	if ((!strcmp(*argv, "-h") || !strcmp(*argv, "--help")) && argc==1)

+	    usage(E_USAGE);

 	else

-            usage();

+            usage(E_OPTERR);

 	argv++;

 	argc--;

     }

     if (argc == 0)

-	usage();

+	usage(E_OPTERR);

     spp = argv;

     safe_strncpy(ifr.ifr_name, *spp++, IFNAMSIZ);

@@ -117,19 +119,19 @@ int main(int argc, char **argv)

     while (*spp != (char *) NULL) {

 	if (!strcmp(*spp, "nibble")) {

 	    if (*++spp == NULL)

-		usage();

+		usage(E_OPTERR);

 	    plip->nibble = atoi(*spp);

 	    spp++;

 	    continue;

 	}

 	if (!strcmp(*spp, "trigger")) {

 	    if (*++spp == NULL)

-		usage();

+		usage(E_OPTERR);

 	    plip->trigger = atoi(*spp);

 	    spp++;

 	    continue;

 	}

-	usage();

+	usage(E_OPTERR);

     }

     plip->pcmd = PLIP_SET_TIMEOUT;

diff --git a/route.c b/route.c

index 4eaed49..d5a3039 100644

--- a/route.c

+++ b/route.c

@@ -76,7 +76,7 @@ int opt_fc = 0;    // routing cache/FIB

 int opt_h = 0;     // help selected

 struct aftype *ap; // selected address family

-static void usage(void)

+static void usage(int rc)

 {

     fprintf(stderr, _("Usage: route [-nNvee] [-FC] [<AF>]           List kernel routing tables\n"));

     fprintf(stderr, _("       route [-v] [-FC] {add|del|flush} ...  Modify routing table for AF.\n\n"));

@@ -93,7 +93,7 @@ static void usage(void)

     fprintf(stderr, _("  <AF>=Use -4, -6, '-A <af>' or '--<af>'; default: %s\n"), DFLT_AF);

     fprintf(stderr, _("  List of possible address families (which support routing):\n"));

     print_aflist(1); /* 1 = routeable */

-    exit(E_USAGE);

+    exit(rc);

 }

@@ -186,11 +186,12 @@ int main(int argc, char **argv)

 	case 'V':

 	    version();

 	case 'h':

+	    usage(E_USAGE);

 	case '?':

 	    opt_h++;

 	    break;

 	default:

-	    usage();

+	    usage(E_OPTERR);

 	}

     argv += optind;

@@ -198,7 +199,7 @@ int main(int argc, char **argv)

     if (opt_h) {

 	if (!afname[0])

-	    usage();

+	    usage(E_OPTERR);

 	else

 	    what = RTACTION_HELP;

     } else {

@@ -217,7 +218,7 @@ int main(int argc, char **argv)

 	    else if (!strcmp(*argv, "flush"))

 		what = RTACTION_FLUSH;

 	    else

-		usage();

+		usage(E_OPTERR);

 	}

     }

@@ -231,7 +232,7 @@ int main(int argc, char **argv)

 	i = route_edit(what, afname, options, ++argv);

     if (i == E_OPTERR)

-	usage();

+	usage(E_OPTERR);

     return (i);

 }

diff --git a/slattach.c b/slattach.c

index 5c81584..dbb2658 100644

--- a/slattach.c

+++ b/slattach.c

@@ -581,7 +581,7 @@ sig_catch(int sig)

 static void

-usage(void)

+usage(int rc)

 {

   char *usage_msg = "Usage: slattach [-ehlLmnqv] "

 #ifdef SIOCSKEEPALIVE

@@ -594,7 +594,7 @@ usage(void)

 	  "       slattach -V | --version\n";

   fputs(usage_msg, stderr);

-  exit(E_USAGE);

+  exit(rc);

 }

@@ -691,7 +691,7 @@ main(int argc, char *argv[])

 		/*NOTREACHED*/

 	default:

-		usage();

+		usage(E_OPTERR);

 		/*NOTREACHED*/

   }

@@ -707,7 +707,7 @@ main(int argc, char *argv[])

        opt_m++;

   /* Is a terminal given? */

-  if (optind != (argc - 1)) usage();

+  if (optind != (argc - 1)) usage(E_OPTERR);

   safe_strncpy(path_buf, argv[optind], sizeof(path_buf));

   if (!strcmp(path_buf, "-")) {

 	opt_e = 1;