usr.bin/netstat/if.c

   1 /*
   2  * Copyright (c) 1983, 1988, 1993
   3  *      The Regents of the University of California.  All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  * 3. All advertising materials mentioning features or use of this software
  14  *    must display the following acknowledgement:
  15  *      This product includes software developed by the University of
  16  *      California, Berkeley and its contributors.
  17  * 4. Neither the name of the University nor the names of its contributors
  18  *    may be used to endorse or promote products derived from this software
  19  *    without specific prior written permission.
  20  *
  21  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  31  * SUCH DAMAGE.
  32  *
  33  * @(#)if.c     8.3 (Berkeley) 4/28/95
  34  * $FreeBSD: src/usr.bin/netstat/if.c,v 1.32.2.9 2001/09/17 14:35:46 ru Exp $
  35  * $DragonFly: src/usr.bin/netstat/if.c,v 1.12 2008/03/07 11:34:21 sephe Exp $
  36  */
  37
  38 #define _KERNEL_STRUCTURES
  39 #include <sys/param.h>
  40 #include <sys/protosw.h>
  41 #include <sys/socket.h>
  42 #include <sys/sysctl.h>
  43 #include <sys/time.h>
  44
  45 #include <net/if.h>
  46 #include <net/if_var.h>
  47 #include <net/if_dl.h>
  48 #include <net/if_types.h>
  49 #include <net/ethernet.h>
  50 #include <netinet/in.h>
  51 #include <netinet/in_var.h>
  52 #include <netproto/ipx/ipx.h>
  53 #include <netproto/ipx/ipx_if.h>
  54 #ifdef ISO
  55 #include <netiso/iso.h>
  56 #include <netiso/iso_var.h>
  57 #endif
  58 #include <arpa/inet.h>
  59
  60 #include <signal.h>
  61 #include <stdio.h>
  62 #include <stdlib.h>
  63 #include <string.h>
  64 #include <unistd.h>
  65
  66 #include "netstat.h"
  67
  68 #define YES     1
  69 #define NO      0
  70
  71 static void sidewaysintpr (u_int, u_long);
  72 static void catchalarm (int);
  73
  74 #ifdef INET6
  75 static char ntop_buf[INET6_ADDRSTRLEN];         /* for inet_ntop() */
  76 #endif
  77
  78
  79 /*
  80  * Display a formatted value, or a '-' in the same space.
  81  */
  82 static void
  83 show_stat(const char *fmt, int width, u_long value, short showvalue)
  84 {
  85         char newfmt[32];
  86
  87         /* Construct the format string */
  88         if (showvalue) {
  89                 sprintf(newfmt, "%%%d%s", width, fmt);
  90                 printf(newfmt, value);
  91         } else {
  92                 sprintf(newfmt, "%%%ds", width);
  93                 printf(newfmt, "-");
  94         }
  95 }
  96
  97
  98
  99 /*
 100  * Print a description of the network interfaces.
 101  */
 102 void
 103 intpr(int interval1, u_long ifnetaddr, void (*pfunc)(char *))
 104 {
 105         struct ifnet ifnet;
 106         struct ifaddr_container ifac;
 107         struct ifnethead ifnethead;
 108         union {
 109                 struct ifaddr ifa;
 110                 struct in_ifaddr in;
 111 #ifdef INET6
 112                 struct in6_ifaddr in6;
 113 #endif
 114                 struct ipx_ifaddr ipx;
 115 #ifdef ISO
 116                 struct iso_ifaddr iso;
 117 #endif
 118         } ifaddr;
 119         u_long ifaddraddr;
 120         u_long ifaddrcont_addr;
 121         u_long ifaddrfound;
 122         u_long ifnetfound;
 123         u_long opackets;
 124         u_long ipackets;
 125         u_long obytes;
 126         u_long ibytes;
 127         u_long oerrors;
 128         u_long ierrors;
 129         u_long collisions;
 130         short timer;
 131         int drops;
 132         struct sockaddr *sa = NULL;
 133         char name[IFNAMSIZ];
 134         short network_layer;
 135         short link_layer;
 136
 137         if (ifnetaddr == 0) {
 138                 printf("ifnet: symbol not defined\n");
 139                 return;
 140         }
 141         if (interval1) {
 142                 sidewaysintpr((unsigned)interval1, ifnetaddr);
 143                 return;
 144         }
 145         if (kread(ifnetaddr, (char *)&ifnethead, sizeof ifnethead))
 146                 return;
 147         ifnetaddr = (u_long)TAILQ_FIRST(&ifnethead);
 148         if (kread(ifnetaddr, (char *)&ifnet, sizeof ifnet))
 149                 return;
 150
 151         if (!pfunc) {
 152                 printf("%-7.7s %-5.5s %-13.13s %-15.15s %8.8s %5.5s",
 153                        "Name", "Mtu", "Network", "Address", "Ipkts", "Ierrs");
 154                 if (bflag)
 155                         printf(" %10.10s","Ibytes");
 156                 printf(" %8.8s %5.5s", "Opkts", "Oerrs");
 157                 if (bflag)
 158                         printf(" %10.10s","Obytes");
 159                 printf(" %5s", "Coll");
 160                 if (tflag)
 161                         printf(" %s", "Time");
 162                 if (dflag)
 163                         printf(" %s", "Drop");
 164                 putchar('\n');
 165         }
 166         ifaddraddr = 0;
 167         while (ifnetaddr || ifaddraddr) {
 168                 struct sockaddr_in *sin;
 169 #ifdef INET6
 170                 struct sockaddr_in6 *sin6;
 171 #endif
 172                 char *cp;
 173                 int n, m;
 174
 175                 network_layer = 0;
 176                 link_layer = 0;
 177
 178                 if (ifaddraddr == 0) {
 179                         struct ifaddrhead head;
 180
 181                         ifnetfound = ifnetaddr;
 182                         if (kread(ifnetaddr, (char *)&ifnet, sizeof ifnet))
 183                                 return;
 184                         strlcpy(name, ifnet.if_xname, sizeof(name));
 185                         ifnetaddr = (u_long)TAILQ_NEXT(&ifnet, if_link);
 186                         if (interface != 0 && (strcmp(name, interface) != 0))
 187                                 continue;
 188                         cp = strchr(name, '\0');
 189
 190                         if (pfunc) {
 191                                 (*pfunc)(name);
 192                                 continue;
 193                         }
 194
 195                         if ((ifnet.if_flags&IFF_UP) == 0)
 196                                 *cp++ = '*';
 197                         *cp = '\0';
 198
 199                         if (kread((u_long)ifnet.if_addrheads,
 200                                   (char *)&head, sizeof(head)))
 201                                 return;
 202
 203                         ifaddrcont_addr =
 204                                 (u_long)TAILQ_FIRST(&head);
 205                         if (ifaddrcont_addr == 0) {
 206                                 ifaddraddr = 0;
 207                         } else {
 208                                 if (kread(ifaddrcont_addr, (char *)&ifac,
 209                                           sizeof(ifac)))
 210                                         return;
 211                                 ifaddraddr = (u_long)ifac.ifa;
 212                         }
 213                 }
 214                 ifaddrfound = ifaddraddr;
 215
 216                 /*
 217                  * Get the interface stats.  These may get
 218                  * overriden below on a per-interface basis.
 219                  */
 220                 opackets = ifnet.if_opackets;
 221                 ipackets = ifnet.if_ipackets;
 222                 obytes = ifnet.if_obytes;
 223                 ibytes = ifnet.if_ibytes;
 224                 oerrors = ifnet.if_oerrors;
 225                 ierrors = ifnet.if_ierrors;
 226                 collisions = ifnet.if_collisions;
 227                 timer = ifnet.if_timer;
 228                 drops = ifnet.if_snd.ifq_drops;
 229
 230                 if (ifaddraddr == 0) {
 231                         printf("%-7.7s %-5lu ", name, ifnet.if_mtu);
 232                         printf("%-13.13s ", "none");
 233                         printf("%-15.15s ", "none");
 234                 } else {
 235                         if (kread(ifaddraddr, (char *)&ifaddr, sizeof ifaddr)) {
 236                                 ifaddraddr = 0;
 237                                 continue;
 238                         }
 239 #define CP(x) ((char *)(x))
 240                         cp = (CP(ifaddr.ifa.ifa_addr) - CP(ifaddraddr)) +
 241                                 CP(&ifaddr);
 242                         sa = (struct sockaddr *)cp;
 243                         if (af != AF_UNSPEC && sa->sa_family != af) {
 244                                 ifaddrcont_addr =
 245                                         (u_long)TAILQ_NEXT(&ifac, ifa_link);
 246                                 if (ifaddrcont_addr == 0) {
 247                                         ifaddraddr = 0;
 248                                 } else {
 249                                         if (kread(ifaddrcont_addr,
 250                                             (char *)&ifac, sizeof(ifac))) {
 251                                                 ifaddraddr = 0;
 252                                                 continue;
 253                                         }
 254                                         ifaddraddr = (u_long)ifac.ifa;
 255                                 }
 256                                 continue;
 257                         }
 258                         printf("%-7.7s %-5lu ", name, ifnet.if_mtu);
 259                         switch (sa->sa_family) {
 260                         case AF_UNSPEC:
 261                                 printf("%-13.13s ", "none");
 262                                 printf("%-15.15s ", "none");
 263                                 break;
 264                         case AF_INET:
 265                                 sin = (struct sockaddr_in *)sa;
 266 #ifdef notdef
 267                                 /* can't use inet_makeaddr because kernel
 268                                  * keeps nets unshifted.
 269                                  */
 270                                 in = inet_makeaddr(ifaddr.in.ia_subnet,
 271                                         INADDR_ANY);
 272                                 printf("%-13.13s ", netname(in.s_addr,
 273                                     ifaddr.in.ia_subnetmask));
 274 #else
 275                                 printf("%-13.13s ",
 276                                     netname(htonl(ifaddr.in.ia_subnet),
 277                                     ifaddr.in.ia_subnetmask));
 278 #endif
 279                                 printf("%-15.15s ",
 280                                     routename(sin->sin_addr.s_addr));
 281
 282                                 network_layer = 1;
 283                                 break;
 284 #ifdef INET6
 285                         case AF_INET6:
 286                                 sin6 = (struct sockaddr_in6 *)sa;
 287                                 printf("%-11.11s ",
 288                                        netname6(&ifaddr.in6.ia_addr,
 289                                                 &ifaddr.in6.ia_prefixmask.sin6_addr));
 290                                 printf("%-17.17s ",
 291                                     inet_ntop(AF_INET6,
 292                                         &sin6->sin6_addr,
 293                                         ntop_buf, sizeof(ntop_buf)));
 294
 295                                 network_layer = 1;
 296                                 break;
 297 #endif /*INET6*/
 298                         case AF_IPX:
 299                                 {
 300                                 struct sockaddr_ipx *sipx =
 301                                         (struct sockaddr_ipx *)sa;
 302                                 u_long net;
 303                                 char netnum[10];
 304
 305                                 *(union ipx_net *) &net = sipx->sipx_addr.x_net;
 306                                 sprintf(netnum, "%lx", (u_long)ntohl(net));
 307                                 printf("ipx:%-8s  ", netnum);
 308 /*                              printf("ipx:%-8s ", netname(net, 0L)); */
 309                                 printf("%-15s ",
 310                                     ipx_phost((struct sockaddr *)sipx));
 311                                 }
 312                                 break;
 313
 314                         case AF_APPLETALK:
 315                                 printf("atalk:%-12.12s ",atalk_print(sa,0x10) );
 316                                 printf("%-9.9s  ",atalk_print(sa,0x0b) );
 317                                 break;
 318                         case AF_LINK:
 319                                 {
 320                                 struct sockaddr_dl *sdl =
 321                                         (struct sockaddr_dl *)sa;
 322                                 char linknum[10];
 323                                 cp = (char *)LLADDR(sdl);
 324                                 n = sdl->sdl_alen;
 325                                 sprintf(linknum, "<Link#%d>", sdl->sdl_index);
 326                                 m = printf("%-11.11s ", linknum);
 327                                 }
 328                                 goto hexprint;
 329                         default:
 330                                 m = printf("(%d)", sa->sa_family);
 331                                 for (cp = sa->sa_len + (char *)sa;
 332                                         --cp > sa->sa_data && (*cp == 0);) {}
 333                                 n = cp - sa->sa_data + 1;
 334                                 cp = sa->sa_data;
 335                         hexprint:
 336                                 while (--n >= 0)
 337                                         m += printf("%02x%c", *cp++ & 0xff,
 338                                                     n > 0 ? ':' : ' ');
 339                                 m = 30 - m;
 340                                 while (m-- > 0)
 341                                         putchar(' ');
 342
 343                                 link_layer = 1;
 344                                 break;
 345                         }
 346
 347                         /*
 348                          * Fixup the statistics for interfaces that
 349                          * update stats for their network addresses
 350                          */
 351                         if (network_layer) {
 352                                 opackets = ifaddr.in.ia_ifa.if_opackets;
 353                                 ipackets = ifaddr.in.ia_ifa.if_ipackets;
 354                                 obytes = ifaddr.in.ia_ifa.if_obytes;
 355                                 ibytes = ifaddr.in.ia_ifa.if_ibytes;
 356                         }
 357
 358                         ifaddrcont_addr =
 359                                 (u_long)TAILQ_NEXT(&ifac, ifa_link);
 360                         if (ifaddrcont_addr == 0) {
 361                                 ifaddraddr = 0;
 362                         } else {
 363                                 if (kread(ifaddrcont_addr,
 364                                     (char *)&ifac, sizeof(ifac))) {
 365                                         ifaddraddr = 0;
 366                                 } else {
 367                                         ifaddraddr = (u_long)ifac.ifa;
 368                                 }
 369                         }
 370                 }
 371
 372                 show_stat("lu", 8, ipackets, link_layer|network_layer);
 373                 printf(" ");
 374                 show_stat("lu", 5, ierrors, link_layer);
 375                 printf(" ");
 376                 if (bflag) {
 377                         show_stat("lu", 10, ibytes, link_layer|network_layer);
 378                         printf(" ");
 379                 }
 380                 show_stat("lu", 8, opackets, link_layer|network_layer);
 381                 printf(" ");
 382                 show_stat("lu", 5, oerrors, link_layer);
 383                 printf(" ");
 384                 if (bflag) {
 385                         show_stat("lu", 10, obytes, link_layer|network_layer);
 386                         printf(" ");
 387                 }
 388                 show_stat("lu", 5, collisions, link_layer);
 389                 if (tflag) {
 390                         printf(" ");
 391                         show_stat("d", 3, timer, link_layer);
 392                 }
 393                 if (dflag) {
 394                         printf(" ");
 395                         show_stat("d", 3, drops, link_layer);
 396                 }
 397                 putchar('\n');
 398                 if (aflag && ifaddrfound) {
 399                         /*
 400                          * Print family's multicast addresses
 401                          */
 402                         struct ifmultiaddr *multiaddr;
 403                         struct ifmultiaddr ifma;
 404                         union {
 405                                 struct sockaddr sa;
 406                                 struct sockaddr_in in;
 407 #ifdef INET6
 408                                 struct sockaddr_in6 in6;
 409 #endif /* INET6 */
 410                                 struct sockaddr_dl dl;
 411                         } msa;
 412                         const char *fmt;
 413
 414                         TAILQ_FOREACH(multiaddr, &ifnet.if_multiaddrs, ifma_link) {
 415                                 if (kread((u_long)multiaddr, (char *)&ifma,
 416                                           sizeof ifma))
 417                                         break;
 418                                 multiaddr = &ifma;
 419                                 if (kread((u_long)ifma.ifma_addr, (char *)&msa,
 420                                           sizeof msa))
 421                                         break;
 422                                 if (msa.sa.sa_family != sa->sa_family)
 423                                         continue;
 424
 425                                 fmt = 0;
 426                                 switch (msa.sa.sa_family) {
 427                                 case AF_INET:
 428                                         fmt = routename(msa.in.sin_addr.s_addr);
 429                                         break;
 430 #ifdef INET6
 431                                 case AF_INET6:
 432                                         printf("%23s %-19.19s(refs: %d)\n", "",
 433                                                inet_ntop(AF_INET6,
 434                                                          &msa.in6.sin6_addr,
 435                                                          ntop_buf,
 436                                                          sizeof(ntop_buf)),
 437                                                ifma.ifma_refcount);
 438                                         break;
 439 #endif /* INET6 */
 440                                 case AF_LINK:
 441                                         switch (msa.dl.sdl_type) {
 442                                         case IFT_ETHER:
 443                                         case IFT_FDDI:
 444                                                 fmt = ether_ntoa(
 445                                                         (struct ether_addr *)
 446                                                         LLADDR(&msa.dl));
 447                                                 break;
 448                                         }
 449                                         break;
 450                                 }
 451                                 if (fmt)
 452                                         printf("%23s %s\n", "", fmt);
 453                         }
 454                 }
 455         }
 456 }
 457
 458 struct  iftot {
 459         SLIST_ENTRY(iftot) chain;
 460         char    ift_name[IFNAMSIZ];     /* interface name */
 461         u_long  ift_ip;                 /* input packets */
 462         u_long  ift_ie;                 /* input errors */
 463         u_long  ift_op;                 /* output packets */
 464         u_long  ift_oe;                 /* output errors */
 465         u_long  ift_co;                 /* collisions */
 466         u_int   ift_dr;                 /* drops */
 467         u_long  ift_ib;                 /* input bytes */
 468         u_long  ift_ob;                 /* output bytes */
 469 };
 470
 471 u_char  signalled;                      /* set if alarm goes off "early" */
 472
 473 /*
 474  * Print a running summary of interface statistics.
 475  * Repeat display every interval1 seconds, showing statistics
 476  * collected over that interval.  Assumes that interval1 is non-zero.
 477  * First line printed at top of screen is always cumulative.
 478  * XXX - should be rewritten to use ifmib(4).
 479  */
 480 static void
 481 sidewaysintpr(unsigned interval1, u_long off)
 482 {
 483         struct ifnet ifnet;
 484         u_long firstifnet;
 485         struct ifnethead ifnethead;
 486         struct iftot *iftot, *ip, *ipn, *total, *sum, *interesting;
 487         int line;
 488         int oldmask, first;
 489         u_long interesting_off;
 490
 491         if (kread(off, (char *)&ifnethead, sizeof ifnethead))
 492                 return;
 493         firstifnet = (u_long)TAILQ_FIRST(&ifnethead);
 494
 495         if ((iftot = malloc(sizeof(struct iftot))) == NULL) {
 496                 printf("malloc failed\n");
 497                 exit(1);
 498         }
 499         memset(iftot, 0, sizeof(struct iftot));
 500
 501         interesting = NULL;
 502         interesting_off = 0;
 503         for (off = firstifnet, ip = iftot; off;) {
 504                 char name[IFNAMSIZ];
 505
 506                 if (kread(off, (char *)&ifnet, sizeof ifnet))
 507                         break;
 508                 strlcpy(name, ifnet.if_xname, sizeof(name));
 509                 if (interface && strcmp(name, interface) == 0) {
 510                         interesting = ip;
 511                         interesting_off = off;
 512                 }
 513                 snprintf(ip->ift_name, 16, "(%s)", name);
 514                 if ((ipn = malloc(sizeof(struct iftot))) == NULL) {
 515                         printf("malloc failed\n");
 516                         exit(1);
 517                 }
 518                 memset(ipn, 0, sizeof(struct iftot));
 519                 SLIST_NEXT(ip, chain) = ipn;
 520                 ip = ipn;
 521                 off = (u_long)TAILQ_NEXT(&ifnet, if_link);
 522         }
 523         if ((total = malloc(sizeof(struct iftot))) == NULL) {
 524                 printf("malloc failed\n");
 525                 exit(1);
 526         }
 527         memset(total, 0, sizeof(struct iftot));
 528         if ((sum = malloc(sizeof(struct iftot))) == NULL) {
 529                 printf("malloc failed\n");
 530                 exit(1);
 531         }
 532         memset(sum, 0, sizeof(struct iftot));
 533
 534
 535         (void)signal(SIGALRM, catchalarm);
 536         signalled = NO;
 537         (void)alarm(interval1);
 538         first = 1;
 539 banner:
 540         printf("%17s %14s %16s", "input",
 541             interesting ? interesting->ift_name : "(Total)", "output");
 542         putchar('\n');
 543         printf("%10s %5s %10s %10s %5s %10s %5s",
 544             "packets", "errs", "bytes", "packets", "errs", "bytes", "colls");
 545         if (dflag)
 546                 printf(" %5.5s", "drops");
 547         putchar('\n');
 548         fflush(stdout);
 549         line = 0;
 550 loop:
 551         if (interesting != NULL) {
 552                 ip = interesting;
 553                 if (kread(interesting_off, (char *)&ifnet, sizeof ifnet)) {
 554                         printf("???\n");
 555                         exit(1);
 556                 };
 557                 if (!first) {
 558                         printf("%10lu %5lu %10lu %10lu %5lu %10lu %5lu",
 559                                 ifnet.if_ipackets - ip->ift_ip,
 560                                 ifnet.if_ierrors - ip->ift_ie,
 561                                 ifnet.if_ibytes - ip->ift_ib,
 562                                 ifnet.if_opackets - ip->ift_op,
 563                                 ifnet.if_oerrors - ip->ift_oe,
 564                                 ifnet.if_obytes - ip->ift_ob,
 565                                 ifnet.if_collisions - ip->ift_co);
 566                         if (dflag)
 567                                 printf(" %5u", ifnet.if_snd.ifq_drops - ip->ift_dr);
 568                 }
 569                 ip->ift_ip = ifnet.if_ipackets;
 570                 ip->ift_ie = ifnet.if_ierrors;
 571                 ip->ift_ib = ifnet.if_ibytes;
 572                 ip->ift_op = ifnet.if_opackets;
 573                 ip->ift_oe = ifnet.if_oerrors;
 574                 ip->ift_ob = ifnet.if_obytes;
 575                 ip->ift_co = ifnet.if_collisions;
 576                 ip->ift_dr = ifnet.if_snd.ifq_drops;
 577         } else {
 578                 sum->ift_ip = 0;
 579                 sum->ift_ie = 0;
 580                 sum->ift_ib = 0;
 581                 sum->ift_op = 0;
 582                 sum->ift_oe = 0;
 583                 sum->ift_ob = 0;
 584                 sum->ift_co = 0;
 585                 sum->ift_dr = 0;
 586                 for (off = firstifnet, ip = iftot;
 587                      off && SLIST_NEXT(ip, chain) != NULL;
 588                      ip = SLIST_NEXT(ip, chain)) {
 589                         if (kread(off, (char *)&ifnet, sizeof ifnet)) {
 590                                 off = 0;
 591                                 continue;
 592                         }
 593                         sum->ift_ip += ifnet.if_ipackets;
 594                         sum->ift_ie += ifnet.if_ierrors;
 595                         sum->ift_ib += ifnet.if_ibytes;
 596                         sum->ift_op += ifnet.if_opackets;
 597                         sum->ift_oe += ifnet.if_oerrors;
 598                         sum->ift_ob += ifnet.if_obytes;
 599                         sum->ift_co += ifnet.if_collisions;
 600                         sum->ift_dr += ifnet.if_snd.ifq_drops;
 601                         off = (u_long)TAILQ_NEXT(&ifnet, if_link);
 602                 }
 603                 if (!first) {
 604                         printf("%10lu %5lu %10lu %10lu %5lu %10lu %5lu",
 605                                 sum->ift_ip - total->ift_ip,
 606                                 sum->ift_ie - total->ift_ie,
 607                                 sum->ift_ib - total->ift_ib,
 608                                 sum->ift_op - total->ift_op,
 609                                 sum->ift_oe - total->ift_oe,
 610                                 sum->ift_ob - total->ift_ob,
 611                                 sum->ift_co - total->ift_co);
 612                         if (dflag)
 613                                 printf(" %5u", sum->ift_dr - total->ift_dr);
 614                 }
 615                 *total = *sum;
 616         }
 617         if (!first)
 618                 putchar('\n');
 619         fflush(stdout);
 620         oldmask = sigblock(sigmask(SIGALRM));
 621         if (! signalled) {
 622                 sigpause(0);
 623         }
 624         sigsetmask(oldmask);
 625         signalled = NO;
 626         (void)alarm(interval1);
 627         line++;
 628         first = 0;
 629         if (line == 21)
 630                 goto banner;
 631         else
 632                 goto loop;
 633         /*NOTREACHED*/
 634 }
 635
 636 /*
 637  * Called if an interval expires before sidewaysintpr has completed a loop.
 638  * Sets a flag to not wait for the alarm.
 639  */
 640 static void
 641 catchalarm(int signo __unused)
 642 {
 643         signalled = YES;
 644 }