[unix-history] / usr / src / usr.bin / netstat / if.c

/*
 * Copyright (c) 1983, 1988, 1993
 *	The Regents of the University of California.  All rights reserved.
 *
 * %sccs.include.redist.c%
 */

#ifndef lint
static char sccsid[] = "@(#)if.c	8.1 (Berkeley) %G%";
#endif /* not lint */

#include <sys/types.h>
#include <sys/protosw.h>
#include <sys/socket.h>
#include <net/if.h>
#include <net/if_dl.h>
#include <netinet/in.h>
#include <netinet/in_var.h>
#include <netns/ns.h>
#include <netns/ns_if.h>
#include <netiso/iso.h>
#include <netiso/iso_var.h>

#include <arpa/inet.h>
#include <stdio.h>
#include <string.h>
#include <signal.h>
#include <unistd.h>
#include "netstat.h"

#define	YES	1
#define	NO	0

static void sidewaysintpr __P((unsigned, u_long));
static void catchalarm __P(());

/*
 * Print a description of the network interfaces.
 */
void
intpr(interval, ifnetaddr)
	int interval;
	u_long ifnetaddr;
{
	struct ifnet ifnet;
	union {
		struct ifaddr ifa;
		struct in_ifaddr in;
		struct ns_ifaddr ns;
		struct iso_ifaddr iso;
	} ifaddr;
	u_long ifaddraddr;
	struct sockaddr *sa;
	char name[16];

	if (ifnetaddr == 0) {
		printf("ifnet: symbol not defined\n");
		return;
	}
	if (interval) {
		sidewaysintpr((unsigned)interval, ifnetaddr);
		return;
	}
	if (kread(ifnetaddr, (char *)&ifnetaddr, sizeof ifnetaddr))
		return;
	printf("%-5.5s %-5.5s %-11.11s %-15.15s %8.8s %5.5s %8.8s %5.5s",
		"Name", "Mtu", "Network", "Address", "Ipkts", "Ierrs",
		"Opkts", "Oerrs");
	printf(" %5s", "Coll");
	if (tflag)
		printf(" %s", "Time");
	if (dflag)
		printf(" %s", "Drop");
	putchar('\n');
	ifaddraddr = 0;
	while (ifnetaddr || ifaddraddr) {
		struct sockaddr_in *sin;
		register char *cp;
		int n, m;

		if (ifaddraddr == 0) {
			if (kread(ifnetaddr, (char *)&ifnet, sizeof ifnet) ||
			    kread((u_long)ifnet.if_name, name, 16))
				return;
			name[15] = '\0';
			ifnetaddr = (u_long) ifnet.if_next;
			if (interface != 0 &&
			    (strcmp(name, interface) != 0 || unit != ifnet.if_unit))
				continue;
			cp = index(name, '\0');
			*cp++ = ifnet.if_unit + '0';
			if ((ifnet.if_flags&IFF_UP) == 0)
				*cp++ = '*';
			*cp = '\0';
			ifaddraddr = (u_long)ifnet.if_addrlist;
		}
		printf("%-5.5s %-5d ", name, ifnet.if_mtu);
		if (ifaddraddr == 0) {
			printf("%-11.11s ", "none");
			printf("%-15.15s ", "none");
		} else {
			if (kread(ifaddraddr, (char *)&ifaddr, sizeof ifaddr)) {
				ifaddraddr = 0;
				continue;
			}
#define CP(x) ((char *)(x))
			cp = (CP(ifaddr.ifa.ifa_addr) - CP(ifaddraddr)) +
				CP(&ifaddr); sa = (struct sockaddr *)cp;
			switch (sa->sa_family) {
			case AF_UNSPEC:
				printf("%-11.11s ", "none");
				printf("%-15.15s ", "none");
				break;
			case AF_INET:
				sin = (struct sockaddr_in *)sa;
#ifdef notdef
				/* can't use inet_makeaddr because kernel
				 * keeps nets unshifted.
				 */
				in = inet_makeaddr(ifaddr.in.ia_subnet,
					INADDR_ANY);
				printf("%-11.11s ", netname(in.s_addr,
				    ifaddr.in.ia_subnetmask));
#else
				printf("%-11.11s ",
				    netname(htonl(ifaddr.in.ia_subnet),
				    ifaddr.in.ia_subnetmask));
#endif
				printf("%-15.15s ",
				    routename(sin->sin_addr.s_addr));
				break;
			case AF_NS:
				{
				struct sockaddr_ns *sns =
					(struct sockaddr_ns *)sa;
				u_long net;
				char netnum[8];

				*(union ns_net *) &net = sns->sns_addr.x_net;
		sprintf(netnum, "%lxH", ntohl(net));
				upHex(netnum);
				printf("ns:%-8s ", netnum);
				printf("%-15s ",
				    ns_phost((struct sockaddr *)sns));
				}
				break;
			case AF_LINK:
				{
				struct sockaddr_dl *sdl =
					(struct sockaddr_dl *)sa;
				    cp = (char *)LLADDR(sdl);
				    n = sdl->sdl_alen;
				}
				m = printf("<Link>");
				goto hexprint;
			default:
				m = printf("(%d)", sa->sa_family);
				for (cp = sa->sa_len + (char *)sa;
					--cp > sa->sa_data && (*cp == 0);) {}
				n = cp - sa->sa_data + 1;
				cp = sa->sa_data;
			hexprint:
				while (--n >= 0)
					m += printf("%x%c", *cp++ & 0xff,
						    n > 0 ? '.' : ' ');
				m = 28 - m;
				while (m-- > 0)
					putchar(' ');
				break;
			}
			ifaddraddr = (u_long)ifaddr.ifa.ifa_next;
		}
		printf("%8d %5d %8d %5d %5d",
		    ifnet.if_ipackets, ifnet.if_ierrors,
		    ifnet.if_opackets, ifnet.if_oerrors,
		    ifnet.if_collisions);
		if (tflag)
			printf(" %3d", ifnet.if_timer);
		if (dflag)
			printf(" %3d", ifnet.if_snd.ifq_drops);
		putchar('\n');
	}
}

#define	MAXIF	10
struct	iftot {
	char	ift_name[16];		/* interface name */
	int	ift_ip;			/* input packets */
	int	ift_ie;			/* input errors */
	int	ift_op;			/* output packets */
	int	ift_oe;			/* output errors */
	int	ift_co;			/* collisions */
	int	ift_dr;			/* drops */
} iftot[MAXIF];

u_char	signalled;			/* set if alarm goes off "early" */

/*
 * Print a running summary of interface statistics.
 * Repeat display every interval seconds, showing statistics
 * collected over that interval.  Assumes that interval is non-zero.
 * First line printed at top of screen is always cumulative.
 */
static void
sidewaysintpr(interval, off)
	unsigned interval;
	u_long off;
{
	struct ifnet ifnet;
	u_long firstifnet;
	register struct iftot *ip, *total;
	register int line;
	struct iftot *lastif, *sum, *interesting;
	int oldmask;

	if (kread(off, (char *)&firstifnet, sizeof (u_long)))
		return;
	lastif = iftot;
	sum = iftot + MAXIF - 1;
	total = sum - 1;
	interesting = iftot;
	for (off = firstifnet, ip = iftot; off;) {
		char *cp;

		if (kread(off, (char *)&ifnet, sizeof ifnet))
			break;
		ip->ift_name[0] = '(';
		if (kread((u_long)ifnet.if_name, ip->ift_name + 1, 15))
			break;
		if (interface && strcmp(ip->ift_name + 1, interface) == 0 &&
		    unit == ifnet.if_unit)
			interesting = ip;
		ip->ift_name[15] = '\0';
		cp = index(ip->ift_name, '\0');
		sprintf(cp, "%d)", ifnet.if_unit);
		ip++;
		if (ip >= iftot + MAXIF - 2)
			break;
		off = (u_long) ifnet.if_next;
	}
	lastif = ip;

	(void)signal(SIGALRM, catchalarm);
	signalled = NO;
	(void)alarm(interval);
banner:
	printf("   input    %-6.6s    output       ", interesting->ift_name);
	if (lastif - iftot > 0) {
		if (dflag)
			printf("      ");
		printf("     input   (Total)    output");
	}
	for (ip = iftot; ip < iftot + MAXIF; ip++) {
		ip->ift_ip = 0;
		ip->ift_ie = 0;
		ip->ift_op = 0;
		ip->ift_oe = 0;
		ip->ift_co = 0;
		ip->ift_dr = 0;
	}
	putchar('\n');
	printf("%8.8s %5.5s %8.8s %5.5s %5.5s ",
		"packets", "errs", "packets", "errs", "colls");
	if (dflag)
		printf("%5.5s ", "drops");
	if (lastif - iftot > 0)
		printf(" %8.8s %5.5s %8.8s %5.5s %5.5s",
			"packets", "errs", "packets", "errs", "colls");
	if (dflag)
		printf(" %5.5s", "drops");
	putchar('\n');
	fflush(stdout);
	line = 0;
loop:
	sum->ift_ip = 0;
	sum->ift_ie = 0;
	sum->ift_op = 0;
	sum->ift_oe = 0;
	sum->ift_co = 0;
	sum->ift_dr = 0;
	for (off = firstifnet, ip = iftot; off && ip < lastif; ip++) {
		if (kread(off, (char *)&ifnet, sizeof ifnet)) {
			off = 0;
			continue;
		}
		if (ip == interesting) {
			printf("%8d %5d %8d %5d %5d",
				ifnet.if_ipackets - ip->ift_ip,
				ifnet.if_ierrors - ip->ift_ie,
				ifnet.if_opackets - ip->ift_op,
				ifnet.if_oerrors - ip->ift_oe,
				ifnet.if_collisions - ip->ift_co);
			if (dflag)
				printf(" %5d",
				    ifnet.if_snd.ifq_drops - ip->ift_dr);
		}
		ip->ift_ip = ifnet.if_ipackets;
		ip->ift_ie = ifnet.if_ierrors;
		ip->ift_op = ifnet.if_opackets;
		ip->ift_oe = ifnet.if_oerrors;
		ip->ift_co = ifnet.if_collisions;
		ip->ift_dr = ifnet.if_snd.ifq_drops;
		sum->ift_ip += ip->ift_ip;
		sum->ift_ie += ip->ift_ie;
		sum->ift_op += ip->ift_op;
		sum->ift_oe += ip->ift_oe;
		sum->ift_co += ip->ift_co;
		sum->ift_dr += ip->ift_dr;
		off = (u_long) ifnet.if_next;
	}
	if (lastif - iftot > 0) {
		printf("  %8d %5d %8d %5d %5d",
			sum->ift_ip - total->ift_ip,
			sum->ift_ie - total->ift_ie,
			sum->ift_op - total->ift_op,
			sum->ift_oe - total->ift_oe,
			sum->ift_co - total->ift_co);
		if (dflag)
			printf(" %5d", sum->ift_dr - total->ift_dr);
	}
	*total = *sum;
	putchar('\n');
	fflush(stdout);
	line++;
	oldmask = sigblock(sigmask(SIGALRM));
	if (! signalled) {
		sigpause(0);
	}
	sigsetmask(oldmask);
	signalled = NO;
	(void)alarm(interval);
	if (line == 21)
		goto banner;
	goto loop;
	/*NOTREACHED*/
}

/*
 * Called if an interval expires before sidewaysintpr has completed a loop.
 * Sets a flag to not wait for the alarm.
 */
static void
catchalarm()
{
	signalled = YES;
}
Commit	Line	Data
5ff67f98	1	/*
2839532b KB	2	* Copyright (c) 1983, 1988, 1993
2839532b KB	3	* The Regents of the University of California. All rights reserved.
ee3f90a5	4	*
87198c0c	5	* %sccs.include.redist.c%
5ff67f98 DF	6	*/
5ff67f98 DF	7
55bef820	8	#ifndef lint
2839532b	9	static char sccsid[] = "@(#)if.c 8.1 (Berkeley) %G%";
b36fc510	10	#endif /* not lint */
55bef820 SL	11
55bef820 SL	12	#include <sys/types.h>
6e549c8f	13	#include <sys/protosw.h>
55bef820	14	#include <sys/socket.h>
55bef820	15	#include <net/if.h>
7eeb8bb9	16	#include <net/if_dl.h>
44906619	17	#include <netinet/in.h>
cab3a575	18	#include <netinet/in_var.h>
f1fbb01b	19	#include <netns/ns.h>
3e117255	20	#include <netns/ns_if.h>
c34ecf77 KS	21	#include <netiso/iso.h>
c34ecf77 KS	22	#include <netiso/iso_var.h>
44906619	23
6e549c8f	24	#include <arpa/inet.h>
90cb8200	25	#include <stdio.h>
6e549c8f	26	#include <string.h>
39fef23d	27	#include <signal.h>
27788811	28	#include <unistd.h>
6e549c8f	29	#include "netstat.h"
39fef23d MK	30
	31	#define YES 1
	32	#define NO 0
55bef820	33
d1cfb820	34	static void sidewaysintpr __P((unsigned, u_long));
6e549c8f	35	static void catchalarm __P(());
55bef820 SL	36
	37	/*
	38	* Print a description of the network interfaces.
55bef820	39	*/
6e549c8f	40	void
55bef820 SL	41	intpr(interval, ifnetaddr)
55bef820 SL	42	int interval;
d1cfb820	43	u_long ifnetaddr;
55bef820 SL	44	{
55bef820 SL	45	struct ifnet ifnet;
cab3a575 MK	46	union {
	47	struct ifaddr ifa;
	48	struct in_ifaddr in;
3e117255	49	struct ns_ifaddr ns;
c34ecf77	50	struct iso_ifaddr iso;
cab3a575	51	} ifaddr;
d1cfb820	52	u_long ifaddraddr;
3e117255	53	struct sockaddr *sa;
55bef820 SL	54	char name[16];
	55
	56	if (ifnetaddr == 0) {
	57	printf("ifnet: symbol not defined\n");
	58	return;
	59	}
	60	if (interval) {
39fef23d	61	sidewaysintpr((unsigned)interval, ifnetaddr);
55bef820 SL	62	return;
55bef820 SL	63	}
6e549c8f KS	64	if (kread(ifnetaddr, (char *)&ifnetaddr, sizeof ifnetaddr))
6e549c8f KS	65	return;
1ecc0948	66	printf("%-5.5s %-5.5s %-11.11s %-15.15s %8.8s %5.5s %8.8s %5.5s",
55bef820 SL	67	"Name", "Mtu", "Network", "Address", "Ipkts", "Ierrs",
55bef820 SL	68	"Opkts", "Oerrs");
1ecc0948	69	printf(" %5s", "Coll");
55bef820	70	if (tflag)
1ecc0948	71	printf(" %s", "Time");
2ebaad6c MK	72	if (dflag)
2ebaad6c MK	73	printf(" %s", "Drop");
55bef820	74	putchar('\n');
cab3a575 MK	75	ifaddraddr = 0;
cab3a575 MK	76	while (ifnetaddr \|\| ifaddraddr) {
55bef820 SL	77	struct sockaddr_in *sin;
55bef820 SL	78	register char *cp;
7eeb8bb9	79	int n, m;
55bef820	80
cab3a575	81	if (ifaddraddr == 0) {
6e549c8f	82	if (kread(ifnetaddr, (char *)&ifnet, sizeof ifnet) \|\|
d1cfb820	83	kread((u_long)ifnet.if_name, name, 16))
6e549c8f	84	return;
cab3a575	85	name[15] = '\0';
d1cfb820	86	ifnetaddr = (u_long) ifnet.if_next;
cab3a575 MK	87	if (interface != 0 &&
	88	(strcmp(name, interface) != 0 \|\| unit != ifnet.if_unit))
	89	continue;
	90	cp = index(name, '\0');
	91	*cp++ = ifnet.if_unit + '0';
	92	if ((ifnet.if_flags&IFF_UP) == 0)
	93	cp++ = '';
	94	*cp = '\0';
d1cfb820	95	ifaddraddr = (u_long)ifnet.if_addrlist;
cab3a575	96	}
55bef820	97	printf("%-5.5s %-5d ", name, ifnet.if_mtu);
cab3a575	98	if (ifaddraddr == 0) {
1ecc0948 MK	99	printf("%-11.11s ", "none");
1ecc0948 MK	100	printf("%-15.15s ", "none");
cab3a575	101	} else {
6e549c8f KS	102	if (kread(ifaddraddr, (char *)&ifaddr, sizeof ifaddr)) {
	103	ifaddraddr = 0;
	104	continue;
	105	}
3e117255 MT	106	#define CP(x) ((char *)(x))
	107	cp = (CP(ifaddr.ifa.ifa_addr) - CP(ifaddraddr)) +
	108	CP(&ifaddr); sa = (struct sockaddr *)cp;
	109	switch (sa->sa_family) {
cab3a575	110	case AF_UNSPEC:
1ecc0948 MK	111	printf("%-11.11s ", "none");
1ecc0948 MK	112	printf("%-15.15s ", "none");
cab3a575 MK	113	break;
cab3a575 MK	114	case AF_INET:
3e117255	115	sin = (struct sockaddr_in *)sa;
cab3a575 MK	116	#ifdef notdef
	117	/* can't use inet_makeaddr because kernel
	118	* keeps nets unshifted.
	119	*/
	120	in = inet_makeaddr(ifaddr.in.ia_subnet,
	121	INADDR_ANY);
6e549c8f KS	122	printf("%-11.11s ", netname(in.s_addr,
6e549c8f KS	123	ifaddr.in.ia_subnetmask));
cab3a575	124	#else
1ecc0948	125	printf("%-11.11s ",
6e549c8f KS	126	netname(htonl(ifaddr.in.ia_subnet),
6e549c8f KS	127	ifaddr.in.ia_subnetmask));
cab3a575	128	#endif
6e549c8f KS	129	printf("%-15.15s ",
6e549c8f KS	130	routename(sin->sin_addr.s_addr));
cab3a575	131	break;
f1fbb01b KS	132	case AF_NS:
	133	{
	134	struct sockaddr_ns *sns =
3e117255	135	(struct sockaddr_ns *)sa;
39fef23d	136	u_long net;
1ecc0948	137	char netnum[8];
39fef23d	138
2ff355d6	139	(union ns_net ) &net = sns->sns_addr.x_net;
3e117255	140	sprintf(netnum, "%lxH", ntohl(net));
1ecc0948 MK	141	upHex(netnum);
1ecc0948 MK	142	printf("ns:%-8s ", netnum);
6e549c8f KS	143	printf("%-15s ",
6e549c8f KS	144	ns_phost((struct sockaddr *)sns));
f1fbb01b KS	145	}
f1fbb01b KS	146	break;
7eeb8bb9 KS	147	case AF_LINK:
	148	{
	149	struct sockaddr_dl *sdl =
	150	(struct sockaddr_dl *)sa;
80b7fcad KS	151	cp = (char *)LLADDR(sdl);
80b7fcad KS	152	n = sdl->sdl_alen;
7eeb8bb9	153	}
80b7fcad KS	154	m = printf("<Link>");
80b7fcad KS	155	goto hexprint;
cab3a575	156	default:
80b7fcad KS	157	m = printf("(%d)", sa->sa_family);
	158	for (cp = sa->sa_len + (char *)sa;
	159	--cp > sa->sa_data && (*cp == 0);) {}
3e117255 MT	160	n = cp - sa->sa_data + 1;
3e117255 MT	161	cp = sa->sa_data;
7eeb8bb9	162	hexprint:
80b7fcad KS	163	while (--n >= 0)
	164	m += printf("%x%c", *cp++ & 0xff,
	165	n > 0 ? '.' : ' ');
	166	m = 28 - m;
7eeb8bb9 KS	167	while (m-- > 0)
7eeb8bb9 KS	168	putchar(' ');
cab3a575 MK	169	break;
cab3a575 MK	170	}
d1cfb820	171	ifaddraddr = (u_long)ifaddr.ifa.ifa_next;
cab3a575	172	}
1ecc0948	173	printf("%8d %5d %8d %5d %5d",
55bef820 SL	174	ifnet.if_ipackets, ifnet.if_ierrors,
	175	ifnet.if_opackets, ifnet.if_oerrors,
	176	ifnet.if_collisions);
	177	if (tflag)
1ecc0948	178	printf(" %3d", ifnet.if_timer);
2ebaad6c MK	179	if (dflag)
2ebaad6c MK	180	printf(" %3d", ifnet.if_snd.ifq_drops);
55bef820	181	putchar('\n');
55bef820 SL	182	}
	183	}
	184
90cb8200 SL	185	#define MAXIF 10
	186	struct iftot {
	187	char ift_name[16]; /* interface name */
	188	int ift_ip; /* input packets */
	189	int ift_ie; /* input errors */
	190	int ift_op; /* output packets */
	191	int ift_oe; /* output errors */
	192	int ift_co; /* collisions */
2ebaad6c	193	int ift_dr; /* drops */
90cb8200 SL	194	} iftot[MAXIF];
90cb8200 SL	195
39fef23d MK	196	u_char signalled; /* set if alarm goes off "early" */
39fef23d MK	197
90cb8200 SL	198	/*
90cb8200 SL	199	* Print a running summary of interface statistics.
39fef23d MK	200	* Repeat display every interval seconds, showing statistics
	201	* collected over that interval. Assumes that interval is non-zero.
	202	* First line printed at top of screen is always cumulative.
90cb8200	203	*/
6e549c8f	204	static void
55bef820	205	sidewaysintpr(interval, off)
39fef23d	206	unsigned interval;
d1cfb820	207	u_long off;
55bef820 SL	208	{
55bef820 SL	209	struct ifnet ifnet;
d1cfb820	210	u_long firstifnet;
90cb8200 SL	211	register struct iftot ip, total;
	212	register int line;
	213	struct iftot lastif, sum, *interesting;
39fef23d	214	int oldmask;
55bef820	215
d1cfb820	216	if (kread(off, (char *)&firstifnet, sizeof (u_long)))
6e549c8f	217	return;
90cb8200 SL	218	lastif = iftot;
	219	sum = iftot + MAXIF - 1;
	220	total = sum - 1;
79ddba48	221	interesting = iftot;
90cb8200 SL	222	for (off = firstifnet, ip = iftot; off;) {
90cb8200 SL	223	char *cp;
55bef820	224
6e549c8f KS	225	if (kread(off, (char *)&ifnet, sizeof ifnet))
6e549c8f KS	226	break;
90cb8200	227	ip->ift_name[0] = '(';
d1cfb820	228	if (kread((u_long)ifnet.if_name, ip->ift_name + 1, 15))
6e549c8f	229	break;
79ddba48 EW	230	if (interface && strcmp(ip->ift_name + 1, interface) == 0 &&
	231	unit == ifnet.if_unit)
	232	interesting = ip;
90cb8200 SL	233	ip->ift_name[15] = '\0';
	234	cp = index(ip->ift_name, '\0');
	235	sprintf(cp, "%d)", ifnet.if_unit);
	236	ip++;
	237	if (ip >= iftot + MAXIF - 2)
	238	break;
d1cfb820	239	off = (u_long) ifnet.if_next;
90cb8200 SL	240	}
90cb8200 SL	241	lastif = ip;
39fef23d MK	242
	243	(void)signal(SIGALRM, catchalarm);
	244	signalled = NO;
	245	(void)alarm(interval);
90cb8200	246	banner:
2ebaad6c MK	247	printf(" input %-6.6s output ", interesting->ift_name);
	248	if (lastif - iftot > 0) {
	249	if (dflag)
	250	printf(" ");
	251	printf(" input (Total) output");
	252	}
90cb8200 SL	253	for (ip = iftot; ip < iftot + MAXIF; ip++) {
	254	ip->ift_ip = 0;
	255	ip->ift_ie = 0;
	256	ip->ift_op = 0;
	257	ip->ift_oe = 0;
	258	ip->ift_co = 0;
2ebaad6c	259	ip->ift_dr = 0;
90cb8200 SL	260	}
90cb8200 SL	261	putchar('\n');
1ecc0948	262	printf("%8.8s %5.5s %8.8s %5.5s %5.5s ",
90cb8200	263	"packets", "errs", "packets", "errs", "colls");
2ebaad6c MK	264	if (dflag)
2ebaad6c MK	265	printf("%5.5s ", "drops");
90cb8200	266	if (lastif - iftot > 0)
2ebaad6c	267	printf(" %8.8s %5.5s %8.8s %5.5s %5.5s",
90cb8200	268	"packets", "errs", "packets", "errs", "colls");
2ebaad6c MK	269	if (dflag)
2ebaad6c MK	270	printf(" %5.5s", "drops");
90cb8200 SL	271	putchar('\n');
	272	fflush(stdout);
	273	line = 0;
	274	loop:
	275	sum->ift_ip = 0;
	276	sum->ift_ie = 0;
	277	sum->ift_op = 0;
	278	sum->ift_oe = 0;
	279	sum->ift_co = 0;
2ebaad6c	280	sum->ift_dr = 0;
90cb8200	281	for (off = firstifnet, ip = iftot; off && ip < lastif; ip++) {
6e549c8f KS	282	if (kread(off, (char *)&ifnet, sizeof ifnet)) {
	283	off = 0;
	284	continue;
	285	}
2ebaad6c MK	286	if (ip == interesting) {
2ebaad6c MK	287	printf("%8d %5d %8d %5d %5d",
90cb8200 SL	288	ifnet.if_ipackets - ip->ift_ip,
	289	ifnet.if_ierrors - ip->ift_ie,
	290	ifnet.if_opackets - ip->ift_op,
	291	ifnet.if_oerrors - ip->ift_oe,
	292	ifnet.if_collisions - ip->ift_co);
2ebaad6c MK	293	if (dflag)
	294	printf(" %5d",
	295	ifnet.if_snd.ifq_drops - ip->ift_dr);
	296	}
90cb8200 SL	297	ip->ift_ip = ifnet.if_ipackets;
	298	ip->ift_ie = ifnet.if_ierrors;
	299	ip->ift_op = ifnet.if_opackets;
	300	ip->ift_oe = ifnet.if_oerrors;
	301	ip->ift_co = ifnet.if_collisions;
2ebaad6c	302	ip->ift_dr = ifnet.if_snd.ifq_drops;
90cb8200 SL	303	sum->ift_ip += ip->ift_ip;
	304	sum->ift_ie += ip->ift_ie;
	305	sum->ift_op += ip->ift_op;
	306	sum->ift_oe += ip->ift_oe;
	307	sum->ift_co += ip->ift_co;
2ebaad6c	308	sum->ift_dr += ip->ift_dr;
d1cfb820	309	off = (u_long) ifnet.if_next;
55bef820	310	}
2ebaad6c MK	311	if (lastif - iftot > 0) {
2ebaad6c MK	312	printf(" %8d %5d %8d %5d %5d",
90cb8200 SL	313	sum->ift_ip - total->ift_ip,
	314	sum->ift_ie - total->ift_ie,
	315	sum->ift_op - total->ift_op,
	316	sum->ift_oe - total->ift_oe,
	317	sum->ift_co - total->ift_co);
2ebaad6c MK	318	if (dflag)
	319	printf(" %5d", sum->ift_dr - total->ift_dr);
	320	}
90cb8200	321	total = sum;
1ecc0948	322	putchar('\n');
90cb8200 SL	323	fflush(stdout);
90cb8200 SL	324	line++;
39fef23d MK	325	oldmask = sigblock(sigmask(SIGALRM));
	326	if (! signalled) {
	327	sigpause(0);
	328	}
	329	sigsetmask(oldmask);
	330	signalled = NO;
	331	(void)alarm(interval);
90cb8200 SL	332	if (line == 21)
	333	goto banner;
	334	goto loop;
	335	/NOTREACHED/
55bef820	336	}
39fef23d MK	337
	338	/*
	339	* Called if an interval expires before sidewaysintpr has completed a loop.
	340	* Sets a flag to not wait for the alarm.
	341	*/
6e549c8f	342	static void
39fef23d MK	343	catchalarm()
	344	{
	345	signalled = YES;
	346	}