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if.c

/*-
 * Copyright (c) 1983, 1988, 1993
 *    The Regents of the University of California.  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. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *    This product includes software developed by the University of
 *    California, Berkeley and its contributors.
 * 4. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``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 REGENTS OR CONTRIBUTORS 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.
 */

#if 0
#ifndef lint
static char sccsid[] = "@(#)if.c    8.3 (Berkeley) 4/28/95";
#endif /* not lint */
#endif

#include <sys/cdefs.h>
__FBSDID("$FreeBSD: src/usr.bin/netstat/if.c,v 1.69.2.1.2.1 2008/11/25 02:59:29 kensmith Exp $");

#include <sys/types.h>
#include <sys/protosw.h>
#include <sys/socket.h>
#include <sys/socketvar.h>
#include <sys/sysctl.h>
#include <sys/time.h>

#include <net/if.h>
#include <net/if_var.h>
#include <net/if_dl.h>
#include <net/if_types.h>
#include <net/ethernet.h>
#include <net/pfvar.h>
#include <net/if_pfsync.h>
#include <netinet/in.h>
#include <netinet/in_var.h>
#include <netipx/ipx.h>
#include <netipx/ipx_if.h>
#include <arpa/inet.h>

#include <err.h>
#include <errno.h>
#include <libutil.h>
#include <signal.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>

#include "netstat.h"

#define     YES   1
#define     NO    0

static void sidewaysintpr(int, u_long);
static void catchalarm(int);

#ifdef INET6
static char ntop_buf[INET6_ADDRSTRLEN];         /* for inet_ntop() */
#endif

/*
 * Dump pfsync statistics structure.
 */
void
pfsync_stats(u_long off, const char *name, int af1 __unused, int proto __unused)
{
      struct pfsyncstats pfsyncstat, zerostat;
      size_t len = sizeof(struct pfsyncstats);

      if (live) {
            if (zflag)
                  memset(&zerostat, 0, len);
            if (sysctlbyname("net.inet.pfsync.stats", &pfsyncstat, &len,
                zflag ? &zerostat : NULL, zflag ? len : 0) < 0) {
                  if (errno != ENOENT)
                        warn("sysctl: net.inet.pfsync.stats");
                  return;
            }
      } else
            kread(off, &pfsyncstat, len);

      printf("%s:\n", name);

#define     p(f, m) if (pfsyncstat.f || sflag <= 1) \
      printf(m, (uintmax_t)pfsyncstat.f, plural(pfsyncstat.f))
#define     p2(f, m) if (pfsyncstat.f || sflag <= 1) \
      printf(m, (uintmax_t)pfsyncstat.f)

      p(pfsyncs_ipackets, "\t%ju packet%s received (IPv4)\n");
      p(pfsyncs_ipackets6, "\t%ju packet%s received (IPv6)\n");
      p(pfsyncs_badif, "\t\t%ju packet%s discarded for bad interface\n");
      p(pfsyncs_badttl, "\t\t%ju packet%s discarded for bad ttl\n");
      p(pfsyncs_hdrops, "\t\t%ju packet%s shorter than header\n");
      p(pfsyncs_badver, "\t\t%ju packet%s discarded for bad version\n");
      p(pfsyncs_badauth, "\t\t%ju packet%s discarded for bad HMAC\n");
      p(pfsyncs_badact,"\t\t%ju packet%s discarded for bad action\n");
      p(pfsyncs_badlen, "\t\t%ju packet%s discarded for short packet\n");
      p(pfsyncs_badval, "\t\t%ju state%s discarded for bad values\n");
      p(pfsyncs_stale, "\t\t%ju stale state%s\n");
      p(pfsyncs_badstate, "\t\t%ju failed state lookup/insert%s\n");
      p(pfsyncs_opackets, "\t%ju packet%s sent (IPv4)\n");
      p(pfsyncs_opackets6, "\t%ju packet%s sent (IPv6)\n");
      p2(pfsyncs_onomem, "\t\t%ju send failed due to mbuf memory error\n");
      p2(pfsyncs_oerrors, "\t\t%ju send error\n");
#undef p
#undef p2
}

/*
 * Display a formatted value, or a '-' in the same space.
 */
static void
show_stat(const char *fmt, int width, u_long value, short showvalue)
{
      const char *lsep, *rsep;
      char newfmt[32];

      lsep = "";
      if (strncmp(fmt, "LS", 2) == 0) {
            lsep = " ";
            fmt += 2;
      }
      rsep = " ";
      if (strncmp(fmt, "NRS", 3) == 0) {
            rsep = "";
            fmt += 3;
      }
      if (showvalue == 0) {
            /* Print just dash. */
            sprintf(newfmt, "%s%%%ds%s", lsep, width, rsep);
            printf(newfmt, "-");
            return;
      }

      if (hflag) {
            char buf[5];

            /* Format in human readable form. */
            humanize_number(buf, sizeof(buf), (int64_t)value, "",
                HN_AUTOSCALE, HN_NOSPACE | HN_DECIMAL);
            sprintf(newfmt, "%s%%%ds%s", lsep, width, rsep);
            printf(newfmt, buf);
      } else {
            /* Construct the format string. */
            sprintf(newfmt, "%s%%%d%s%s", lsep, width, fmt, rsep);
            printf(newfmt, value);
      }
}

/*
 * Print a description of the network interfaces.
 */
void
intpr(int interval1, u_long ifnetaddr, void (*pfunc)(char *))
{
      struct ifnet ifnet;
      struct ifnethead ifnethead;
      union {
            struct ifaddr ifa;
            struct in_ifaddr in;
#ifdef INET6
            struct in6_ifaddr in6;
#endif
            struct ipx_ifaddr ipx;
      } ifaddr;
      u_long ifaddraddr;
      u_long ifaddrfound;
      u_long ifnetfound;
      u_long opackets;
      u_long ipackets;
      u_long obytes;
      u_long ibytes;
      u_long omcasts;
      u_long imcasts;
      u_long oerrors;
      u_long ierrors;
      u_long collisions;
      short timer;
      int drops;
      struct sockaddr *sa = NULL;
      char name[IFNAMSIZ];
      short network_layer;
      short link_layer;

      if (ifnetaddr == 0) {
            printf("ifnet: symbol not defined\n");
            return;
      }
      if (interval1) {
            sidewaysintpr(interval1, ifnetaddr);
            return;
      }
      if (kread(ifnetaddr, (char *)&ifnethead, sizeof ifnethead) != 0)
            return;
      ifnetaddr = (u_long)TAILQ_FIRST(&ifnethead);
      if (kread(ifnetaddr, (char *)&ifnet, sizeof ifnet) != 0)
            return;

      if (!pfunc) {
            if (Wflag)
                  printf("%-7.7s", "Name");
            else
                  printf("%-5.5s", "Name");
            printf(" %5.5s %-13.13s %-17.17s %8.8s %5.5s",
                "Mtu", "Network", "Address", "Ipkts", "Ierrs");
            if (bflag)
                  printf(" %10.10s","Ibytes");
            printf(" %8.8s %5.5s", "Opkts", "Oerrs");
            if (bflag)
                  printf(" %10.10s","Obytes");
            printf(" %5s", "Coll");
            if (tflag)
                  printf(" %s", "Time");
            if (dflag)
                  printf(" %s", "Drop");
            putchar('\n');
      }
      ifaddraddr = 0;
      while (ifnetaddr || ifaddraddr) {
            struct sockaddr_in *sockin;
#ifdef INET6
            struct sockaddr_in6 *sockin6;
#endif
            char *cp;
            int n, m;

            network_layer = 0;
            link_layer = 0;

            if (ifaddraddr == 0) {
                  ifnetfound = ifnetaddr;
                  if (kread(ifnetaddr, (char *)&ifnet, sizeof ifnet) != 0)
                        return;
                  strlcpy(name, ifnet.if_xname, sizeof(name));
                  ifnetaddr = (u_long)TAILQ_NEXT(&ifnet, if_link);
                  if (interface != 0 && strcmp(name, interface) != 0)
                        continue;
                  cp = index(name, '\0');

                  if (pfunc) {
                        (*pfunc)(name);
                        continue;
                  }

                  if ((ifnet.if_flags&IFF_UP) == 0)
                        *cp++ = '*';
                  *cp = '\0';
                  ifaddraddr = (u_long)TAILQ_FIRST(&ifnet.if_addrhead);
            }
            ifaddrfound = ifaddraddr;

            /*
             * Get the interface stats.  These may get
             * overriden below on a per-interface basis.
             */
            opackets = ifnet.if_opackets;
            ipackets = ifnet.if_ipackets;
            obytes = ifnet.if_obytes;
            ibytes = ifnet.if_ibytes;
            omcasts = ifnet.if_omcasts;
            imcasts = ifnet.if_imcasts;
            oerrors = ifnet.if_oerrors;
            ierrors = ifnet.if_ierrors;
            collisions = ifnet.if_collisions;
            timer = ifnet.if_timer;
            drops = ifnet.if_snd.ifq_drops;

            if (ifaddraddr == 0) {
                  if (Wflag)
                        printf("%-7.7s", name);
                  else
                        printf("%-5.5s", name);
                  printf(" %5lu ", ifnet.if_mtu);
                  printf("%-13.13s ", "none");
                  printf("%-17.17s ", "none");
            } else {
                  if (kread(ifaddraddr, (char *)&ifaddr, sizeof ifaddr)
                      != 0) {
                        ifaddraddr = 0;
                        continue;
                  }
#define     CP(x) ((char *)(x))
                  cp = (CP(ifaddr.ifa.ifa_addr) - CP(ifaddraddr)) +
                        CP(&ifaddr);
                  sa = (struct sockaddr *)cp;
                  if (af != AF_UNSPEC && sa->sa_family != af) {
                        ifaddraddr =
                            (u_long)TAILQ_NEXT(&ifaddr.ifa, ifa_link);
                        continue;
                  }
                  if (Wflag)
                        printf("%-7.7s", name);
                  else
                        printf("%-5.5s", name);
                  printf(" %5lu ", ifnet.if_mtu);
                  switch (sa->sa_family) {
                  case AF_UNSPEC:
                        printf("%-13.13s ", "none");
                        printf("%-15.15s ", "none");
                        break;
                  case AF_INET:
                        sockin = (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("%-13.13s ", netname(in.s_addr,
                            ifaddr.in.ia_subnetmask));
#else
                        printf("%-13.13s ",
                            netname(htonl(ifaddr.in.ia_subnet),
                            ifaddr.in.ia_subnetmask));
#endif
                        printf("%-17.17s ",
                            routename(sockin->sin_addr.s_addr));

                        network_layer = 1;
                        break;
#ifdef INET6
                  case AF_INET6:
                        sockin6 = (struct sockaddr_in6 *)sa;
                        printf("%-13.13s ",
                               netname6(&ifaddr.in6.ia_addr,
                                    &ifaddr.in6.ia_prefixmask.sin6_addr));
                        printf("%-17.17s ",
                            inet_ntop(AF_INET6,
                              &sockin6->sin6_addr,
                              ntop_buf, sizeof(ntop_buf)));

                        network_layer = 1;
                        break;
#endif /*INET6*/
                  case AF_IPX:
                        {
                        struct sockaddr_ipx *sipx =
                              (struct sockaddr_ipx *)sa;
                        u_long net;
                        char netnum[10];

                        *(union ipx_net *) &net = sipx->sipx_addr.x_net;
                        sprintf(netnum, "%lx", (u_long)ntohl(net));
                        printf("ipx:%-8s  ", netnum);
/*                      printf("ipx:%-8s ", netname(net, 0L)); */
                        printf("%-17s ",
                            ipx_phost((struct sockaddr *)sipx));
                        }

                        network_layer = 1;
                        break;

                  case AF_APPLETALK:
                        printf("atalk:%-12.12s ",atalk_print(sa,0x10) );
                        printf("%-11.11s  ",atalk_print(sa,0x0b) );
                        break;
                  case AF_LINK:
                        {
                        struct sockaddr_dl *sdl =
                              (struct sockaddr_dl *)sa;
                        char linknum[10];
                        cp = (char *)LLADDR(sdl);
                        n = sdl->sdl_alen;
                        sprintf(linknum, "<Link#%d>", sdl->sdl_index);
                        m = printf("%-13.13s ", linknum);
                        }
                        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("%02x%c", *cp++ & 0xff,
                                        n > 0 ? ':' : ' ');
                        m = 32 - m;
                        while (m-- > 0)
                              putchar(' ');

                        link_layer = 1;
                        break;
                  }

                  /*
                   * Fixup the statistics for interfaces that
                   * update stats for their network addresses
                   */
                  if (network_layer) {
                        opackets = ifaddr.in.ia_ifa.if_opackets;
                        ipackets = ifaddr.in.ia_ifa.if_ipackets;
                        obytes = ifaddr.in.ia_ifa.if_obytes;
                        ibytes = ifaddr.in.ia_ifa.if_ibytes;
                  }

                  ifaddraddr = (u_long)TAILQ_NEXT(&ifaddr.ifa, ifa_link);
            }

            show_stat("lu", 8, ipackets, link_layer|network_layer);
            show_stat("lu", 5, ierrors, link_layer);
            if (bflag)
                  show_stat("lu", 10, ibytes, link_layer|network_layer);

            show_stat("lu", 8, opackets, link_layer|network_layer);
            show_stat("lu", 5, oerrors, link_layer);
            if (bflag)
                  show_stat("lu", 10, obytes, link_layer|network_layer);

            show_stat("NRSlu", 5, collisions, link_layer);
            if (tflag)
                  show_stat("LSd", 4, timer, link_layer);
            if (dflag)
                  show_stat("LSd", 4, drops, link_layer);
            putchar('\n');

            if (aflag && ifaddrfound) {
                  /*
                   * Print family's multicast addresses
                   */
                  struct ifmultiaddr *multiaddr;
                  struct ifmultiaddr ifma;
                  union {
                        struct sockaddr sa;
                        struct sockaddr_in in;
#ifdef INET6
                        struct sockaddr_in6 in6;
#endif /* INET6 */
                        struct sockaddr_dl dl;
                  } msa;
                  const char *fmt;

                  TAILQ_FOREACH(multiaddr, &ifnet.if_multiaddrs, ifma_link) {
                        if (kread((u_long)multiaddr, (char *)&ifma,
                                sizeof ifma) != 0)
                              break;
                        multiaddr = &ifma;
                        if (kread((u_long)ifma.ifma_addr, (char *)&msa,
                                sizeof msa) != 0)
                              break;
                        if (msa.sa.sa_family != sa->sa_family)
                              continue;

                        fmt = 0;
                        switch (msa.sa.sa_family) {
                        case AF_INET:
                              fmt = routename(msa.in.sin_addr.s_addr);
                              break;
#ifdef INET6
                        case AF_INET6:
                              printf("%*s %-19.19s(refs: %d)\n",
                                     Wflag ? 27 : 25, "",
                                     inet_ntop(AF_INET6,
                                           &msa.in6.sin6_addr,
                                           ntop_buf,
                                           sizeof(ntop_buf)),
                                     ifma.ifma_refcount);
                              break;
#endif /* INET6 */
                        case AF_LINK:
                              switch (msa.dl.sdl_type) {
                              case IFT_ETHER:
                              case IFT_FDDI:
                                    fmt = ether_ntoa(
                                          (struct ether_addr *)
                                          LLADDR(&msa.dl));
                                    break;
                              }
                              break;
                        }
                        if (fmt) {
                              printf("%*s %-17.17s",
                                  Wflag ? 27 : 25, "", fmt);
                              if (msa.sa.sa_family == AF_LINK) {
                                    printf(" %8lu", imcasts);
                                    printf("%*s",
                                        bflag ? 17 : 6, "");
                                    printf(" %8lu", omcasts);
                              }
                              putchar('\n');
                        }
                  }
            }
      }
}

struct      iftot {
      SLIST_ENTRY(iftot) chain;
      char  ift_name[IFNAMSIZ];     /* interface name */
      u_long      ift_ip;                 /* input packets */
      u_long      ift_ie;                 /* input errors */
      u_long      ift_op;                 /* output packets */
      u_long      ift_oe;                 /* output errors */
      u_long      ift_co;                 /* collisions */
      u_int ift_dr;                 /* drops */
      u_long      ift_ib;                 /* input bytes */
      u_long      ift_ob;                 /* output bytes */
};

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

/*
 * Print a running summary of interface statistics.
 * Repeat display every interval1 seconds, showing statistics
 * collected over that interval.  Assumes that interval1 is non-zero.
 * First line printed at top of screen is always cumulative.
 * XXX - should be rewritten to use ifmib(4).
 */
static void
sidewaysintpr(int interval1, u_long off)
{
      struct ifnet ifnet;
      u_long firstifnet;
      struct ifnethead ifnethead;
      struct itimerval interval_it;
      struct iftot *iftot, *ip, *ipn, *total, *sum, *interesting;
      int line;
      int oldmask, first;
      u_long interesting_off;

      if (kread(off, (char *)&ifnethead, sizeof ifnethead) != 0)
            return;
      firstifnet = (u_long)TAILQ_FIRST(&ifnethead);

      if ((iftot = malloc(sizeof(struct iftot))) == NULL) {
            printf("malloc failed\n");
            exit(1);
      }
      memset(iftot, 0, sizeof(struct iftot));

      interesting = NULL;
      interesting_off = 0;
      for (off = firstifnet, ip = iftot; off;) {
            char name[IFNAMSIZ];

            if (kread(off, (char *)&ifnet, sizeof ifnet) != 0)
                  break;
            strlcpy(name, ifnet.if_xname, sizeof(name));
            if (interface && strcmp(name, interface) == 0) {
                  interesting = ip;
                  interesting_off = off;
            }
            snprintf(ip->ift_name, sizeof(ip->ift_name), "(%s)", name);;
            if ((ipn = malloc(sizeof(struct iftot))) == NULL) {
                  printf("malloc failed\n");
                  exit(1);
            }
            memset(ipn, 0, sizeof(struct iftot));
            SLIST_NEXT(ip, chain) = ipn;
            ip = ipn;
            off = (u_long)TAILQ_NEXT(&ifnet, if_link);
      }
      if (interface && interesting == NULL)
            errx(1, "%s: unknown interface", interface);
      if ((total = malloc(sizeof(struct iftot))) == NULL) {
            printf("malloc failed\n");
            exit(1);
      }
      memset(total, 0, sizeof(struct iftot));
      if ((sum = malloc(sizeof(struct iftot))) == NULL) {
            printf("malloc failed\n");
            exit(1);
      }
      memset(sum, 0, sizeof(struct iftot));

      (void)signal(SIGALRM, catchalarm);
      signalled = NO;
      interval_it.it_interval.tv_sec = interval1;
      interval_it.it_interval.tv_usec = 0;
      interval_it.it_value = interval_it.it_interval;
      setitimer(ITIMER_REAL, &interval_it, NULL);
      first = 1;
banner:
      printf("%17s %14s %16s", "input",
          interesting ? interesting->ift_name : "(Total)", "output");
      putchar('\n');
      printf("%10s %5s %10s %10s %5s %10s %5s",
          "packets", "errs", "bytes", "packets", "errs", "bytes", "colls");
      if (dflag)
            printf(" %5.5s", "drops");
      putchar('\n');
      fflush(stdout);
      line = 0;
loop:
      if (interesting != NULL) {
            ip = interesting;
            if (kread(interesting_off, (char *)&ifnet, sizeof ifnet) != 0) {
                  printf("???\n");
                  exit(1);
            };
            if (!first) {
                  show_stat("lu", 10, ifnet.if_ipackets - ip->ift_ip, 1);
                  show_stat("lu", 5, ifnet.if_ierrors - ip->ift_ie, 1);
                  show_stat("lu", 10, ifnet.if_ibytes - ip->ift_ib, 1);
                  show_stat("lu", 10, ifnet.if_opackets - ip->ift_op, 1);
                  show_stat("lu", 5, ifnet.if_oerrors - ip->ift_oe, 1);
                  show_stat("lu", 10, ifnet.if_obytes - ip->ift_ob, 1);
                  show_stat("NRSlu", 5,
                      ifnet.if_collisions - ip->ift_co, 1);
                  if (dflag)
                        show_stat("LSu", 5,
                            ifnet.if_snd.ifq_drops - ip->ift_dr, 1);
            }
            ip->ift_ip = ifnet.if_ipackets;
            ip->ift_ie = ifnet.if_ierrors;
            ip->ift_ib = ifnet.if_ibytes;
            ip->ift_op = ifnet.if_opackets;
            ip->ift_oe = ifnet.if_oerrors;
            ip->ift_ob = ifnet.if_obytes;
            ip->ift_co = ifnet.if_collisions;
            ip->ift_dr = ifnet.if_snd.ifq_drops;
      } else {
            sum->ift_ip = 0;
            sum->ift_ie = 0;
            sum->ift_ib = 0;
            sum->ift_op = 0;
            sum->ift_oe = 0;
            sum->ift_ob = 0;
            sum->ift_co = 0;
            sum->ift_dr = 0;
            for (off = firstifnet, ip = iftot;
                 off && SLIST_NEXT(ip, chain) != NULL;
                 ip = SLIST_NEXT(ip, chain)) {
                  if (kread(off, (char *)&ifnet, sizeof ifnet) != 0) {
                        off = 0;
                        continue;
                  }
                  sum->ift_ip += ifnet.if_ipackets;
                  sum->ift_ie += ifnet.if_ierrors;
                  sum->ift_ib += ifnet.if_ibytes;
                  sum->ift_op += ifnet.if_opackets;
                  sum->ift_oe += ifnet.if_oerrors;
                  sum->ift_ob += ifnet.if_obytes;
                  sum->ift_co += ifnet.if_collisions;
                  sum->ift_dr += ifnet.if_snd.ifq_drops;
                  off = (u_long)TAILQ_NEXT(&ifnet, if_link);
            }
            if (!first) {
                  show_stat("lu", 10, sum->ift_ip - total->ift_ip, 1);
                  show_stat("lu", 5, sum->ift_ie - total->ift_ie, 1);
                  show_stat("lu", 10, sum->ift_ib - total->ift_ib, 1);
                  show_stat("lu", 10, sum->ift_op - total->ift_op, 1);
                  show_stat("lu", 5, sum->ift_oe - total->ift_oe, 1);
                  show_stat("lu", 10, sum->ift_ob - total->ift_ob, 1);
                  show_stat("NRSlu", 5, sum->ift_co - total->ift_co, 1);
                  if (dflag)
                        show_stat("LSu", 5,
                            sum->ift_dr - total->ift_dr, 1);
            }
            *total = *sum;
      }
      if (!first)
            putchar('\n');
      fflush(stdout);
      oldmask = sigblock(sigmask(SIGALRM));
      while (!signalled)
            sigpause(0);
      signalled = NO;
      sigsetmask(oldmask);
      line++;
      first = 0;
      if (line == 21)
            goto banner;
      else
            goto loop;
      /*NOTREACHED*/
}

/*
 * Set a flag to indicate that a signal from the periodic itimer has been
 * caught.
 */
static void
catchalarm(int signo __unused)
{
      signalled = YES;
}

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