usr.bin/w/w.c

   1 /*      $NetBSD: w.c,v 1.82 2014/12/22 15:24:14 dennis Exp $    */
   2
   3 /*-
   4  * Copyright (c) 1980, 1991, 1993, 1994
   5  *      The Regents of the University of California.  All rights reserved.
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that the following conditions
   9  * are met:
  10  * 1. Redistributions of source code must retain the above copyright
  11  *    notice, this list of conditions and the following disclaimer.
  12  * 2. Redistributions in binary form must reproduce the above copyright
  13  *    notice, this list of conditions and the following disclaimer in the
  14  *    documentation and/or other materials provided with the distribution.
  15  * 3. Neither the name of the University nor the names of its contributors
  16  *    may be used to endorse or promote products derived from this software
  17  *    without specific prior written permission.
  18  *
  19  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  20  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  21  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  22  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  23  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  24  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  25  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  26  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  27  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  28  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  29  * SUCH DAMAGE.
  30  */
  31
  32 #include <sys/cdefs.h>
  33 #ifndef lint
  34 __COPYRIGHT("@(#) Copyright (c) 1980, 1991, 1993, 1994\
  35  The Regents of the University of California.  All rights reserved.");
  36 #endif /* not lint */
  37
  38 #ifndef lint
  39 #if 0
  40 static char sccsid[] = "@(#)w.c 8.6 (Berkeley) 6/30/94";
  41 #else
  42 __RCSID("$NetBSD: w.c,v 1.82 2014/12/22 15:24:14 dennis Exp $");
  43 #endif
  44 #endif /* not lint */
  45
  46 /*
  47  * w - print system status (who and what)
  48  *
  49  * This program is similar to the systat command on Tenex/Tops 10/20
  50  *
  51  */
  52 #include <sys/param.h>
  53 #include <sys/types.h>
  54 #include <sys/time.h>
  55 #include <sys/stat.h>
  56 #include <sys/sysctl.h>
  57 #include <sys/proc.h>
  58 #include <sys/ioctl.h>
  59 #include <sys/socket.h>
  60
  61 #include <netinet/in.h>
  62 #include <arpa/inet.h>
  63
  64 #include <ctype.h>
  65 #include <err.h>
  66 #include <errno.h>
  67 #include <fcntl.h>
  68 #include <kvm.h>
  69 #include <limits.h>
  70 #include <netdb.h>
  71 #include <nlist.h>
  72 #include <paths.h>
  73 #include <stdio.h>
  74 #include <stdlib.h>
  75 #include <string.h>
  76 #include <time.h>
  77 #include <tzfile.h>
  78 #include <unistd.h>
  79 #ifdef SUPPORT_UTMP
  80 #include <utmp.h>
  81 #endif
  82 #ifdef SUPPORT_UTMPX
  83 #include <utmpx.h>
  84 #endif
  85 #include <vis.h>
  86
  87 #include "extern.h"
  88
  89 struct timeval  boottime;
  90 struct winsize  ws;
  91 kvm_t          *kd;
  92 time_t          now;            /* the current time of day */
  93 int             ttywidth;       /* width of tty */
  94 int             argwidth;       /* width of tty left to print process args */
  95 int             header = 1;     /* true if -h flag: don't print heading */
  96 int             nflag;          /* true if -n flag: don't convert addrs */
  97 int             wflag;          /* true if -w flag: wide printout */
  98 int             sortidle;       /* sort bu idle time */
  99 char           *sel_user;       /* login of particular user selected */
 100 char            domain[MAXHOSTNAMELEN + 1];
 101 int maxname = 8, maxline = 3, maxhost = 16;
 102
 103 /*
 104  * One of these per active utmp entry.
 105  */
 106 struct  entry {
 107         struct  entry *next;
 108         char name[UTX_USERSIZE + 1];
 109         char line[UTX_LINESIZE + 1];
 110         char host[UTX_HOSTSIZE + 1];
 111         char type[2];
 112         struct timeval tv;
 113         dev_t   tdev;                   /* dev_t of terminal */
 114         time_t  idle;                   /* idle time of terminal in seconds */
 115         struct  kinfo_proc2 *tp;        /* `most interesting' tty proc */
 116         struct  kinfo_proc2 *pp;        /* pid proc */
 117         pid_t   pid;                    /* pid or ~0 if not known */
 118 } *ehead = NULL, **nextp = &ehead;
 119
 120 static void     pr_args(struct kinfo_proc2 *);
 121 static void     pr_header(time_t *, int);
 122 static int      proc_compare_wrapper(const struct kinfo_proc2 *,
 123     const struct kinfo_proc2 *);
 124 #if defined(SUPPORT_UTMP) || defined(SUPPORT_UTMPX)
 125 static int      ttystat(const char *, struct stat *);
 126 static void     process(struct entry *);
 127 #endif
 128 static void     fixhost(struct entry *ep);
 129 __dead static void      usage(int);
 130
 131 int
 132 main(int argc, char **argv)
 133 {
 134         struct kinfo_proc2 *kp;
 135         struct entry *ep;
 136         int ch, i, nentries, nusers, wcmd, curtain, use_sysctl;
 137         char *memf, *nlistf, *usrnp;
 138         const char *options;
 139         time_t then;
 140         size_t len;
 141 #ifdef SUPPORT_UTMP
 142         struct utmp *ut;
 143 #endif
 144 #ifdef SUPPORT_UTMPX
 145         struct utmpx *utx;
 146 #endif
 147         const char *progname;
 148         char errbuf[_POSIX2_LINE_MAX];
 149
 150         setprogname(argv[0]);
 151
 152         /* Are we w(1) or uptime(1)? */
 153         progname = getprogname();
 154         if (*progname == '-')
 155                 progname++;
 156         if (*progname == 'u') {
 157                 wcmd = 0;
 158                 options = "";
 159         } else {
 160                 wcmd = 1;
 161                 options = "hiM:N:nw";
 162         }
 163
 164         memf = nlistf = NULL;
 165         while ((ch = getopt(argc, argv, options)) != -1)
 166                 switch (ch) {
 167                 case 'h':
 168                         header = 0;
 169                         break;
 170                 case 'i':
 171                         sortidle = 1;
 172                         break;
 173                 case 'M':
 174                         header = 0;
 175                         memf = optarg;
 176                         break;
 177                 case 'N':
 178                         nlistf = optarg;
 179                         break;
 180                 case 'n':
 181                         nflag = 1;
 182                         break;
 183                 case 'w':
 184                         wflag = 1;
 185                         break;
 186                 case '?':
 187                 default:
 188                         usage(wcmd);
 189                 }
 190         argc -= optind;
 191         argv += optind;
 192
 193         use_sysctl = (memf == NULL && nlistf == NULL);
 194
 195         if ((kd = kvm_openfiles(nlistf, memf, NULL,
 196             memf == NULL ? KVM_NO_FILES : O_RDONLY, errbuf)) == NULL)
 197                 errx(1, "%s", errbuf);
 198
 199         (void)time(&now);
 200
 201         if (use_sysctl) {
 202                 len = sizeof(curtain);
 203                 if (sysctlbyname("security.curtain", &curtain, &len,
 204                     NULL, 0) == -1)
 205                         curtain = 0;
 206         }
 207
 208 #ifdef SUPPORT_UTMPX
 209         setutxent();
 210 #endif
 211 #ifdef SUPPORT_UTMP
 212         setutent();
 213 #endif
 214
 215         if (*argv)
 216                 sel_user = *argv;
 217
 218         nusers = 0;
 219 #ifdef SUPPORT_UTMPX
 220         while ((utx = getutxent()) != NULL) {
 221                 if (utx->ut_type != USER_PROCESS)
 222                         continue;
 223                 ++nusers;
 224
 225 #ifndef SUPPORT_UTMP
 226                 if (wcmd == 0)
 227                         continue;
 228 #endif  /* !SUPPORT_UTMP */
 229
 230                 if (sel_user &&
 231                     strncmp(utx->ut_name, sel_user, sizeof(utx->ut_name)) != 0)
 232                         continue;
 233                 if ((ep = calloc(1, sizeof(struct entry))) == NULL)
 234                         err(1, NULL);
 235                 (void)memcpy(ep->line, utx->ut_line, sizeof(utx->ut_line));
 236                 ep->line[sizeof(utx->ut_line)] = '\0';
 237                 *nextp = ep;
 238                 nextp = &(ep->next);
 239
 240                 if (wcmd == 0)
 241                         continue;
 242
 243                 (void)memcpy(ep->name, utx->ut_name, sizeof(utx->ut_name));
 244                 ep->name[sizeof(utx->ut_name)] = '\0';
 245                 if (!nflag || getnameinfo((struct sockaddr *)&utx->ut_ss,
 246                     utx->ut_ss.ss_len, ep->host, sizeof(ep->host), NULL, 0,
 247                     NI_NUMERICHOST) != 0) {
 248                         (void)memcpy(ep->host, utx->ut_host,
 249                             sizeof(utx->ut_host));
 250                         ep->host[sizeof(utx->ut_host)] = '\0';
 251                 }
 252                 fixhost(ep);
 253                 ep->type[0] = 'x';
 254                 ep->tv = utx->ut_tv;
 255                 ep->pid = utx->ut_pid;
 256                 process(ep);
 257         }
 258 #endif
 259
 260 #ifdef SUPPORT_UTMP
 261         while ((ut = getutent()) != NULL) {
 262                 if (ut->ut_name[0] == '\0')
 263                         continue;
 264
 265                 if (sel_user &&
 266                     strncmp(ut->ut_name, sel_user, sizeof(ut->ut_name)) != 0)
 267                         continue;
 268
 269                 /* Don't process entries that we have utmpx for */
 270                 for (ep = ehead; ep != NULL; ep = ep->next) {
 271                         if (strncmp(ep->line, ut->ut_line,
 272                             sizeof(ut->ut_line)) == 0)
 273                                 break;
 274                 }
 275                 if (ep != NULL)
 276                         continue;
 277
 278                 ++nusers;
 279
 280                 if (wcmd == 0)
 281                         continue;
 282
 283                 if ((ep = calloc(1, sizeof(struct entry))) == NULL)
 284                         err(1, NULL);
 285                 (void)memcpy(ep->name, ut->ut_name, sizeof(ut->ut_name));
 286                 (void)memcpy(ep->line, ut->ut_line, sizeof(ut->ut_line));
 287                 (void)memcpy(ep->host, ut->ut_host, sizeof(ut->ut_host));
 288                 ep->name[sizeof(ut->ut_name)] = '\0';
 289                 ep->line[sizeof(ut->ut_line)] = '\0';
 290                 ep->host[sizeof(ut->ut_host)] = '\0';
 291                 fixhost(ep);
 292                 ep->tv.tv_sec = ut->ut_time;
 293                 *nextp = ep;
 294                 nextp = &(ep->next);
 295                 process(ep);
 296         }
 297 #endif
 298
 299 #ifdef SUPPORT_UTMPX
 300         endutxent();
 301 #endif
 302 #ifdef SUPPORT_UTMP
 303         endutent();
 304 #endif
 305
 306         if (header || wcmd == 0) {
 307                 pr_header(&now, nusers);
 308                 if (wcmd == 0)
 309                         exit (0);
 310         }
 311
 312         if ((kp = kvm_getproc2(kd, KERN_PROC_ALL, 0,
 313             sizeof(struct kinfo_proc2), &nentries)) == NULL)
 314                 errx(1, "%s", kvm_geterr(kd));
 315
 316         /* Include trailing space because TTY header starts one column early. */
 317         for (i = 0; i < nentries; i++, kp++) {
 318
 319                 for (ep = ehead; ep != NULL; ep = ep->next) {
 320                         if (ep->tdev != 0 && ep->tdev == kp->p_tdev &&
 321                             kp->p__pgid == kp->p_tpgid) {
 322                                 /*
 323                                  * Proc is in foreground of this
 324                                  * terminal
 325                                  */
 326                                 if (proc_compare_wrapper(ep->tp, kp))
 327                                         ep->tp = kp;
 328                                 break;
 329                         }
 330                         if (ep->pid != 0 && ep->pid == kp->p_pid) {
 331                                 ep->pp = kp;
 332                                 break;
 333                         }
 334                 }
 335         }
 336
 337         if ((ioctl(STDOUT_FILENO, TIOCGWINSZ, &ws) == -1 &&
 338             ioctl(STDERR_FILENO, TIOCGWINSZ, &ws) == -1 &&
 339             ioctl(STDIN_FILENO, TIOCGWINSZ, &ws) == -1) || ws.ws_col == 0)
 340                 ttywidth = 79;
 341         else
 342                 ttywidth = ws.ws_col - 1;
 343
 344         if (!wflag && maxhost > (ttywidth / 3))
 345                 maxhost = ttywidth / 3;
 346
 347         argwidth = printf("%-*s TTY     %-*s %*s  IDLE WHAT\n",
 348             maxname, "USER", maxhost, "FROM",
 349             7 /* "dddhhXm" */, "LOGIN@");
 350         argwidth -= sizeof("WHAT\n") - 1 /* NUL */;
 351         argwidth = ttywidth - argwidth;
 352         if (argwidth < 4)
 353                 argwidth = 8;
 354         if (wflag)
 355                 argwidth = -1;
 356
 357         /* sort by idle time */
 358         if (sortidle && ehead != NULL) {
 359                 struct entry *from = ehead, *save;
 360
 361                 ehead = NULL;
 362                 while (from != NULL) {
 363                         for (nextp = &ehead;
 364                             (*nextp) && from->idle >= (*nextp)->idle;
 365                             nextp = &(*nextp)->next)
 366                                 continue;
 367                         save = from;
 368                         from = from->next;
 369                         save->next = *nextp;
 370                         *nextp = save;
 371                 }
 372         }
 373 #if defined(SUPPORT_UTMP) && defined(SUPPORT_UTMPX)
 374         else if (ehead != NULL) {
 375                 struct entry *from = ehead, *save;
 376
 377                 ehead = NULL;
 378                 while (from != NULL) {
 379                         for (nextp = &ehead;
 380                             (*nextp) && strcmp(from->line, (*nextp)->line) > 0;
 381                             nextp = &(*nextp)->next)
 382                                 continue;
 383                         save = from;
 384                         from = from->next;
 385                         save->next = *nextp;
 386                         *nextp = save;
 387                 }
 388         }
 389 #endif
 390
 391         if (!nflag) {
 392                 int     rv;
 393                 char    *p;
 394
 395                 rv = gethostname(domain, sizeof(domain));
 396                 domain[sizeof(domain) - 1] = '\0';
 397                 if (rv < 0 || (p = strchr(domain, '.')) == 0)
 398                         domain[0] = '\0';
 399                 else
 400                         memmove(domain, p, strlen(p) + 1);
 401         }
 402
 403         for (ep = ehead; ep != NULL; ep = ep->next) {
 404                 if (ep->tp != NULL)
 405                         kp = ep->tp;
 406                 else if (ep->pp != NULL)
 407                         kp = ep->pp;
 408                 else if (ep->pid != 0) {
 409                         if (curtain)
 410                                 kp = NULL;
 411                         else {
 412                                 warnx("Stale utmp%s entry: %s %s %s",
 413                                     ep->type, ep->name, ep->line, ep->host);
 414                                 continue;
 415                         }
 416                 }
 417 #if !defined(__minix)
 418                 usrnp = (kp == NULL) ? ep->name : kp->p_login;
 419 #else
 420                 usrnp = ep->name; /* TODO: implement getlogin/setlogin */
 421 #endif /* !defined(__minix) */
 422                 (void)printf("%-*s %-7.7s %-*.*s ",
 423                     maxname, usrnp, ep->line,
 424                     maxhost, maxhost, ep->host);
 425                 then = (time_t)ep->tv.tv_sec;
 426                 pr_attime(&then, &now);
 427                 pr_idle(ep->idle);
 428                 pr_args(kp);
 429                 (void)printf("\n");
 430         }
 431         exit(0);
 432 }
 433
 434 static void
 435 pr_args(struct kinfo_proc2 *kp)
 436 {
 437         char **argv;
 438         int left;
 439
 440         if (kp == 0)
 441                 goto nothing;
 442         left = argwidth;
 443         argv = kvm_getargv2(kd, kp, (argwidth < 0) ? 0 : argwidth);
 444         if (argv == 0) {
 445                 fmt_putc('(', &left);
 446                 fmt_puts((char *)kp->p_comm, &left);
 447                 fmt_putc(')', &left);
 448                 return;
 449         }
 450         while (*argv) {
 451                 fmt_puts(*argv, &left);
 452                 argv++;
 453                 fmt_putc(' ', &left);
 454         }
 455         return;
 456 nothing:
 457         putchar('-');
 458 }
 459
 460 static void
 461 pr_header(time_t *nowp, int nusers)
 462 {
 463         double avenrun[3];
 464         time_t uptime;
 465         int days, hrs, mins;
 466         int mib[2];
 467         size_t size, i;
 468         char buf[256];
 469
 470         /*
 471          * Print time of day.
 472          *
 473          * SCCS forces the string manipulation below, as it replaces
 474          * %, M, and % in a character string with the file name.
 475          */
 476         (void)strftime(buf, sizeof(buf), "%l:%" "M%p", localtime(nowp));
 477         buf[sizeof(buf) - 1] = '\0';
 478         (void)printf("%s ", buf);
 479
 480         /*
 481          * Print how long system has been up.
 482          * (Found by looking getting "boottime" from the kernel)
 483          */
 484         mib[0] = CTL_KERN;
 485         mib[1] = KERN_BOOTTIME;
 486         size = sizeof(boottime);
 487         if (sysctl(mib, 2, &boottime, &size, NULL, 0) != -1 &&
 488             boottime.tv_sec != 0) {
 489                 uptime = now - boottime.tv_sec;
 490                 uptime += 30;
 491                 if (uptime > SECSPERMIN) {
 492                         days = uptime / SECSPERDAY;
 493                         uptime %= SECSPERDAY;
 494                         hrs = uptime / SECSPERHOUR;
 495                         uptime %= SECSPERHOUR;
 496                         mins = uptime / SECSPERMIN;
 497                         (void)printf(" up");
 498                         if (days > 0)
 499                                 (void)printf(" %d day%s,", days,
 500                                     days > 1 ? "s" : "");
 501                         if (hrs > 0 && mins > 0)
 502                                 (void)printf(" %2d:%02d,", hrs, mins);
 503                         else {
 504                                 if (hrs > 0)
 505                                         (void)printf(" %d hr%s,",
 506                                             hrs, hrs > 1 ? "s" : "");
 507                                 if (mins > 0)
 508                                         (void)printf(" %d min%s,",
 509                                             mins, mins > 1 ? "s" : "");
 510                         }
 511                 }
 512         }
 513
 514         /* Print number of users logged in to system */
 515         (void)printf(" %d user%s", nusers, nusers != 1 ? "s" : "");
 516
 517         /*
 518          * Print 1, 5, and 15 minute load averages.
 519          */
 520         if (getloadavg(avenrun, sizeof(avenrun) / sizeof(avenrun[0])) == -1)
 521                 (void)printf(", no load average information available\n");
 522         else {
 523                 (void)printf(", load averages:");
 524                 for (i = 0; i < (sizeof(avenrun) / sizeof(avenrun[0])); i++) {
 525                         if (i > 0)
 526                                 (void)printf(",");
 527                         (void)printf(" %.2f", avenrun[i]);
 528                 }
 529                 (void)printf("\n");
 530         }
 531 }
 532
 533 #if defined(SUPPORT_UTMP) || defined(SUPPORT_UTMPX)
 534 static int
 535 ttystat(const char *line, struct stat *st)
 536 {
 537         char ttybuf[MAXPATHLEN];
 538
 539         (void)snprintf(ttybuf, sizeof(ttybuf), "%s%s", _PATH_DEV, line);
 540         return stat(ttybuf, st);
 541 }
 542
 543 static void
 544 process(struct entry *ep)
 545 {
 546         struct stat st;
 547         time_t touched;
 548         int max;
 549
 550         if ((max = strlen(ep->name)) > maxname)
 551                 maxname = max;
 552         if ((max = strlen(ep->line)) > maxline)
 553                 maxline = max;
 554         if ((max = strlen(ep->host)) > maxhost)
 555                 maxhost = max;
 556
 557         ep->tdev = 0;
 558         ep->idle = (time_t)-1;
 559
 560 #ifdef SUPPORT_UTMP
 561         /*
 562          * Hack to recognize and correctly parse
 563          * ut entry made by ftpd. The "tty" used
 564          * by ftpd is not a real tty, just identifier in
 565          * form ftpPID. Pid parsed from the "tty name"
 566          * is used later to match corresponding process.
 567          * NB: This is only used for utmp entries. For utmpx,
 568          * we already have the pid.
 569          */
 570         if (ep->pid == 0 && strncmp(ep->line, "ftp", 3) == 0) {
 571                 ep->pid = strtol(ep->line + 3, NULL, 10);
 572                 return;
 573         }
 574 #endif
 575         if (ttystat(ep->line, &st) == -1)
 576                 return;
 577
 578         ep->tdev = st.st_rdev;
 579         /*
 580          * If this is the console device, attempt to ascertain
 581          * the true console device dev_t.
 582          */
 583         if (ep->tdev == 0) {
 584                 int mib[2];
 585                 size_t size;
 586
 587                 mib[0] = CTL_KERN;
 588                 mib[1] = KERN_CONSDEV;
 589                 size = sizeof(dev_t);
 590                 (void) sysctl(mib, 2, &ep->tdev, &size, NULL, 0);
 591         }
 592
 593         touched = st.st_atime;
 594         if (touched < ep->tv.tv_sec) {
 595                 /* tty untouched since before login */
 596                 touched = ep->tv.tv_sec;
 597         }
 598         if ((ep->idle = now - touched) < 0)
 599                 ep->idle = 0;
 600 }
 601 #endif
 602
 603 static int
 604 proc_compare_wrapper(const struct kinfo_proc2 *p1,
 605     const struct kinfo_proc2 *p2)
 606 {
 607         struct kinfo_lwp *l1, *l2;
 608         int cnt;
 609
 610         if (p1 == NULL)
 611                 return 1;
 612
 613         l1 = kvm_getlwps(kd, p1->p_pid, 0, sizeof(*l1), &cnt);
 614         if (l1 == NULL || cnt == 0)
 615                 return 1;
 616
 617         l2 = kvm_getlwps(kd, p2->p_pid, 0, sizeof(*l1), &cnt);
 618         if (l2 == NULL || cnt == 0)
 619                 return 0;
 620
 621         return proc_compare(p1, l1, p2, l2);
 622 }
 623
 624 static void
 625 fixhost(struct entry *ep)
 626 {
 627         char host_buf[sizeof(ep->host)];
 628         char *p, *x;
 629         struct hostent *hp;
 630         struct in_addr l;
 631
 632         strlcpy(host_buf, *ep->host ? ep->host : "-", sizeof(host_buf));
 633         p = host_buf;
 634
 635         /*
 636          * XXX: Historical behavior, ':' in hostname means X display number,
 637          * IPv6 not handled.
 638          */
 639         for (x = p; x < &host_buf[sizeof(host_buf)]; x++)
 640                 if (*x == '\0' || *x == ':')
 641                         break;
 642         if (x == p + sizeof(host_buf) || *x != ':')
 643                 x = NULL;
 644         else
 645                 *x++ = '\0';
 646
 647         if (!nflag && inet_aton(p, &l) &&
 648             (hp = gethostbyaddr((char *)&l, sizeof(l), AF_INET))) {
 649                 if (domain[0] != '\0') {
 650                         p = hp->h_name;
 651                         p += strlen(hp->h_name);
 652                         p -= strlen(domain);
 653                         if (p > hp->h_name &&
 654                             strcasecmp(p, domain) == 0)
 655                                 *p = '\0';
 656                 }
 657                 p = hp->h_name;
 658         }
 659
 660         if (x)
 661                 (void)snprintf(ep->host, sizeof(ep->host), "%s:%s", p, x);
 662         else
 663
 664                 strlcpy(ep->host, p, sizeof(ep->host));
 665 }
 666
 667 static void
 668 usage(int wcmd)
 669 {
 670
 671         if (wcmd)
 672                 (void)fprintf(stderr,
 673                     "Usage: %s [-hinw] [-M core] [-N system] [user]\n",
 674                     getprogname());
 675         else
 676                 (void)fprintf(stderr, "Usage: %s\n", getprogname());
 677         exit(1);
 678 }