usr.bin/w/w.c

   1 /*-
   2  * Copyright (c) 1980, 1991, 1993, 1994
   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. Neither the name of the University nor the names of its contributors
  14  *    may be used to endorse or promote products derived from this software
  15  *    without specific prior written permission.
  16  *
  17  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  27  * SUCH DAMAGE.
  28  *
  29  * @(#) Copyright (c) 1980, 1991, 1993, 1994 The Regents of the University of California.  All rights reserved.
  30  * @(#)w.c      8.4 (Berkeley) 4/16/94
  31  * $FreeBSD: src/usr.bin/w/w.c,v 1.38.2.6 2002/03/12 19:51:51 phantom Exp $
  32  */
  33
  34 /*
  35  * w - print system status (who and what)
  36  *
  37  * This program is similar to the systat command on Tenex/Tops 10/20
  38  *
  39  */
  40 #include <sys/user.h>
  41 #include <sys/param.h>
  42 #include <sys/time.h>
  43 #include <sys/stat.h>
  44 #include <sys/sysctl.h>
  45 #include <sys/ioctl.h>
  46 #include <sys/socket.h>
  47 #include <sys/tty.h>
  48
  49 #include <machine/cpu.h>
  50 #include <netinet/in.h>
  51 #include <arpa/inet.h>
  52
  53 #include <ctype.h>
  54 #include <err.h>
  55 #include <errno.h>
  56 #include <fcntl.h>
  57 #include <kvm.h>
  58 #include <limits.h>
  59 #include <langinfo.h>
  60 #include <locale.h>
  61 #include <netdb.h>
  62 #include <nlist.h>
  63 #include <paths.h>
  64 #include <stdio.h>
  65 #include <stdlib.h>
  66 #include <string.h>
  67 #include <unistd.h>
  68 #ifdef SUPPORT_UTMP
  69 #include <utmp.h>
  70 #endif
  71 #ifdef SUPPORT_UTMPX
  72 #include <utmpx.h>
  73 #endif
  74 #include <vis.h>
  75
  76 #include <arpa/nameser.h>
  77 #include <resolv.h>
  78
  79 #include "extern.h"
  80
  81 struct timeval  boottime;
  82 #ifdef SUPPORT_UTMP
  83 struct utmp     utmp;
  84 #endif
  85 struct winsize  ws;
  86 kvm_t          *kd;
  87 time_t          now;            /* the current time of day */
  88 time_t          then;
  89 time_t          uptime;         /* time of last reboot & elapsed time since */
  90 int             ttywidth;       /* width of tty */
  91 int             argwidth;       /* width of tty */
  92 int             header = 1;     /* true if -h flag: don't print heading */
  93 int             nflag;          /* true if -n flag: don't convert addrs */
  94 int             dflag;          /* true if -d flag: output debug info */
  95 int             sortidle;       /* sort by idle time */
  96 int             use_ampm;       /* use AM/PM time */
  97 int             use_comma;      /* use comma as floats separator */
  98 char          **sel_users;      /* login array of particular users selected */
  99 char            domain[MAXHOSTNAMELEN];
 100 int maxname = 8, maxline = 3, maxhost = 16;
 101
 102 /*
 103  * One of these per active utmp entry.
 104  */
 105 struct  entry {
 106         struct  entry *next;
 107         char name[UTX_USERSIZE + 1];
 108         char line[UTX_LINESIZE + 1];
 109         char host[UTX_HOSTSIZE + 1];
 110         char type[2];
 111         struct timeval tv;
 112         dev_t   tdev;                   /* dev_t of terminal */
 113         time_t  idle;                   /* idle time of terminal in seconds */
 114         struct  kinfo_proc *kp;         /* `most interesting' proc */
 115         char    *args;                  /* arg list of interesting process */
 116         struct  kinfo_proc *dkp;        /* debug option proc list */
 117         pid_t   pid;                    /* pid or ~0 if not known */
 118 } *ep, *ehead = NULL, **nextp = &ehead;
 119
 120 #define debugproc(p) *((struct kinfo_proc **)&(p)->kp_spare[0])
 121
 122 static void              pr_header(time_t *, int);
 123 #if defined(SUPPORT_UTMP) || defined(SUPPORT_UTMPX)
 124 static struct stat      *ttystat(char *, int);
 125 static void     process(struct entry *);
 126 #endif
 127 static void              usage(int);
 128 static int               this_is_uptime(const char *s);
 129
 130 char *fmt_argv(char **, char *, int);   /* ../../bin/ps/fmt.c */
 131
 132 int
 133 main(int argc, char **argv)
 134 {
 135         struct kinfo_proc *kp;
 136         struct kinfo_proc *dkp;
 137         struct hostent *hp;
 138         in_addr_t l;
 139         int ch, i, nentries, nusers, wcmd, longidle, dropgid;
 140         char *memf, *nlistf, *p, *x;
 141 #ifdef SUPPORT_UTMP
 142         struct utmp *ut;
 143 #endif
 144 #ifdef SUPPORT_UTMPX
 145         struct utmpx *utx;
 146 #endif
 147         char buf[MAXHOSTNAMELEN], errbuf[_POSIX2_LINE_MAX];
 148
 149         (void)setlocale(LC_ALL, "");
 150         use_ampm = (*nl_langinfo(T_FMT_AMPM) != '\0');
 151         use_comma = (*nl_langinfo(RADIXCHAR) != ',');
 152
 153         /* Are we w(1) or uptime(1)? */
 154         if (this_is_uptime(argv[0]) == 0) {
 155                 wcmd = 0;
 156                 p = "";
 157         } else {
 158                 wcmd = 1;
 159                 p = "dhiflM:N:nsuw";
 160         }
 161
 162         dropgid = 0;
 163         memf = nlistf = _PATH_DEVNULL;
 164         while ((ch = getopt(argc, argv, p)) != -1)
 165                 switch (ch) {
 166                 case 'd':
 167                         dflag = 1;
 168                         break;
 169                 case 'h':
 170                         header = 0;
 171                         break;
 172                 case 'i':
 173                         sortidle = 1;
 174                         break;
 175                 case 'M':
 176                         header = 0;
 177                         memf = optarg;
 178                         dropgid = 1;
 179                         break;
 180                 case 'N':
 181                         nlistf = optarg;
 182                         dropgid = 1;
 183                         break;
 184                 case 'n':
 185                         nflag = 1;
 186                         break;
 187                 case 'f': case 'l': case 's': case 'u': case 'w':
 188                         warnx("[-flsuw] no longer supported");
 189                         /* FALLTHROUGH */
 190                 case '?':
 191                 default:
 192                         usage(wcmd);
 193                 }
 194         argc -= optind;
 195         argv += optind;
 196
 197         if (!(_res.options & RES_INIT))
 198                 res_init();
 199         _res.retrans = 2;       /* resolver timeout to 2 seconds per try */
 200         _res.retry = 1;         /* only try once.. */
 201
 202         /*
 203          * Discard setgid privileges if not the running kernel so that bad
 204          * guys can't print interesting stuff from kernel memory.
 205          */
 206         if (dropgid)
 207                 setgid(getgid());
 208
 209         if ((kd = kvm_openfiles(nlistf, memf, NULL, O_RDONLY, errbuf)) == NULL)
 210                 errx(1, "%s", errbuf);
 211
 212         (void)time(&now);
 213 #ifdef SUPPORT_UTMPX
 214         setutxent();
 215 #endif
 216 #ifdef SUPPORT_UTMP
 217         setutent();
 218 #endif
 219
 220         if (*argv)
 221                 sel_users = argv;
 222
 223         nusers = 0;
 224 #ifdef SUPPORT_UTMPX
 225         while ((utx = getutxent()) != NULL) {
 226                 if (utx->ut_type != USER_PROCESS)
 227                         continue;
 228                 ++nusers;
 229
 230                 if (sel_users) {
 231                         int usermatch;
 232                         char **user;
 233
 234                         usermatch = 0;
 235                         for (user = sel_users; !usermatch && *user; user++)
 236                                 if (!strncmp(utx->ut_name, *user, UTX_USERSIZE))
 237                                         usermatch = 1;
 238                         if (!usermatch)
 239                                 continue;
 240                 }
 241
 242                 if ((ep = calloc(1, sizeof(struct entry))) == NULL)
 243                         err(1, NULL);
 244                 (void)memcpy(ep->name, utx->ut_name, sizeof(utx->ut_name));
 245                 (void)memcpy(ep->line, utx->ut_line, sizeof(utx->ut_line));
 246                 (void)memcpy(ep->host, utx->ut_host, sizeof(utx->ut_host));
 247                 ep->name[sizeof(utx->ut_name)] = '\0';
 248                 ep->line[sizeof(utx->ut_line)] = '\0';
 249                 ep->host[sizeof(utx->ut_host)] = '\0';
 250 #if 1
 251                 /* XXX: Actually we don't support the utx->ut_ss stuff yet */
 252                 if (!nflag || getnameinfo((struct sockaddr *)&utx->ut_ss,
 253                     utx->ut_ss.ss_len, ep->host, sizeof(ep->host), NULL, 0,
 254                     NI_NUMERICHOST) != 0) {
 255                         (void)memcpy(ep->host, utx->ut_host,
 256                             sizeof(utx->ut_host));
 257                         ep->host[sizeof(utx->ut_host)] = '\0';
 258                 }
 259 #endif
 260                 ep->type[0] = 'x';
 261                 ep->tv = utx->ut_tv;
 262                 ep->pid = utx->ut_pid;
 263
 264                 *nextp = ep;
 265                 nextp = &(ep->next);
 266                 if (wcmd != 0)
 267                         process(ep);
 268         }
 269 #endif
 270
 271 #ifdef SUPPORT_UTMP
 272         while ((ut = getutent()) != NULL) {
 273                 if (ut->ut_name[0] == '\0')
 274                         continue;
 275                 ++nusers;
 276                 if (sel_users) {
 277                         int usermatch;
 278                         char **user;
 279
 280                         usermatch = 0;
 281                         for (user = sel_users; !usermatch && *user; user++)
 282                                 if (!strncmp(ut->ut_name, *user, UT_NAMESIZE))
 283                                         usermatch = 1;
 284                         if (!usermatch)
 285                                 continue;
 286                 }
 287
 288                 /* Don't process entries that we have utmpx for */
 289                 for (ep = ehead; ep != NULL; ep = ep->next) {
 290                         if (strncmp(ep->line, ut->ut_line,
 291                             sizeof(ut->ut_line)) == 0)
 292                                 break;
 293                 }
 294                 if (ep != NULL) {
 295                         --nusers; /* Duplicate entry */
 296                         continue;
 297                 }
 298
 299                 if ((ep = calloc(1, sizeof(struct entry))) == NULL)
 300                         err(1, NULL);
 301                 (void)memcpy(ep->name, ut->ut_name, sizeof(ut->ut_name));
 302                 (void)memcpy(ep->line, ut->ut_line, sizeof(ut->ut_line));
 303                 (void)memcpy(ep->host, ut->ut_host, sizeof(ut->ut_host));
 304                 ep->name[sizeof(ut->ut_name)] = '\0';
 305                 ep->line[sizeof(ut->ut_line)] = '\0';
 306                 ep->host[sizeof(ut->ut_host)] = '\0';
 307                 ep->tv.tv_sec = ut->ut_time;
 308
 309                 *nextp = ep;
 310                 nextp = &(ep->next);
 311                 if (wcmd != 0)
 312                         process(ep);
 313         }
 314 #endif
 315
 316 #ifdef SUPPORT_UTMPX
 317         endutxent();
 318 #endif
 319 #ifdef SUPPORT_UTMP
 320         endutent();
 321 #endif
 322
 323         if (header || wcmd == 0) {
 324                 pr_header(&now, nusers);
 325                 if (wcmd == 0) {
 326                         (void)kvm_close(kd);
 327                         exit(0);
 328                 }
 329
 330 #define HEADER_USER             "USER"
 331 #define HEADER_TTY              "TTY"
 332 #define HEADER_FROM             "FROM"
 333 #define HEADER_LOGIN_IDLE       "LOGIN@  IDLE "
 334 #define HEADER_WHAT             "WHAT\n"
 335 #define WUSED  (maxname + maxline + maxhost + \
 336                 sizeof(HEADER_LOGIN_IDLE) + 3)  /* header width incl. spaces */
 337                 (void)printf("%-*.*s %-*.*s %-*.*s  %s",
 338                                 maxname, maxname, HEADER_USER,
 339                                 maxline, maxline, HEADER_TTY,
 340                                 maxhost, maxhost, HEADER_FROM,
 341                                 HEADER_LOGIN_IDLE HEADER_WHAT);
 342         }
 343
 344         if ((kp = kvm_getprocs(kd, KERN_PROC_ALL, 0, &nentries)) == NULL)
 345                 err(1, "%s", kvm_geterr(kd));
 346         for (i = 0; i < nentries; i++, kp++) {
 347                 if (kp->kp_stat == SIDL || kp->kp_stat == SZOMB)
 348                         continue;
 349                 for (ep = ehead; ep != NULL; ep = ep->next) {
 350                         if (ep->tdev == kp->kp_tdev) {
 351                                 /*
 352                                  * proc is associated with this terminal
 353                                  */
 354                                 if (ep->kp == NULL && kp->kp_pgid == kp->kp_tpgid) {
 355                                         /*
 356                                          * Proc is 'most interesting'
 357                                          */
 358                                         if (proc_compare(ep->kp, kp))
 359                                                 ep->kp = kp;
 360                                 }
 361                                 /*
 362                                  * Proc debug option info; add to debug
 363                                  * list using kinfo_proc kp_eproc.e_spare
 364                                  * as next pointer; ptr to ptr avoids the
 365                                  * ptr = long assumption.
 366                                  */
 367                                 dkp = ep->dkp;
 368                                 ep->dkp = kp;
 369                                 debugproc(kp) = dkp;
 370                         }
 371                         if (ep->pid != 0 && ep->pid == kp->kp_pid) {
 372                                 ep->kp = kp;
 373                                 break;
 374                         }
 375                 }
 376         }
 377         if ((ioctl(STDOUT_FILENO, TIOCGWINSZ, &ws) == -1 &&
 378              ioctl(STDERR_FILENO, TIOCGWINSZ, &ws) == -1 &&
 379              ioctl(STDIN_FILENO, TIOCGWINSZ, &ws) == -1) || ws.ws_col == 0)
 380                ttywidth = 79;
 381         else
 382                ttywidth = ws.ws_col - 1;
 383         argwidth = ttywidth - WUSED;
 384         if (argwidth < 4)
 385                 argwidth = 8;
 386         for (ep = ehead; ep != NULL; ep = ep->next) {
 387                 if (ep->kp == NULL) {
 388                         ep->args = "-";
 389                         continue;
 390                 }
 391                 ep->args = fmt_argv(kvm_getargv(kd, ep->kp, argwidth),
 392                     ep->kp->kp_comm, MAXCOMLEN);
 393                 if (ep->args == NULL)
 394                         err(1, NULL);
 395         }
 396         /* sort by idle time */
 397         if (sortidle && ehead != NULL) {
 398                 struct entry *from, *save;
 399
 400                 from = ehead;
 401                 ehead = NULL;
 402                 while (from != NULL) {
 403                         for (nextp = &ehead;
 404                             (*nextp) && from->idle >= (*nextp)->idle;
 405                             nextp = &(*nextp)->next)
 406                                 continue;
 407                         save = from;
 408                         from = from->next;
 409                         save->next = *nextp;
 410                         *nextp = save;
 411                 }
 412         }
 413 #if defined(SUPPORT_UTMP) && defined(SUPPORT_UTMPX)
 414         else if (ehead != NULL) {
 415                 struct entry *from = ehead, *save;
 416
 417                 ehead = NULL;
 418                 while (from != NULL) {
 419                         for (nextp = &ehead;
 420                             (*nextp) && strcmp(from->line, (*nextp)->line) > 0;
 421                             nextp = &(*nextp)->next)
 422                                 continue;
 423                         save = from;
 424                         from = from->next;
 425                         save->next = *nextp;
 426                         *nextp = save;
 427                 }
 428         }
 429 #endif
 430
 431         if (!nflag) {
 432                 if (gethostname(domain, sizeof(domain)) < 0 ||
 433                     (p = strchr(domain, '.')) == NULL)
 434                         domain[0] = '\0';
 435                 else {
 436                         domain[sizeof(domain) - 1] = '\0';
 437                         memmove(domain, p, strlen(p) + 1);
 438                 }
 439         }
 440
 441         for (ep = ehead; ep != NULL; ep = ep->next) {
 442                 char host_buf[UTX_HOSTSIZE + 1];
 443
 444                 host_buf[UTX_HOSTSIZE] = '\0';
 445                 strncpy(host_buf, ep->host, maxhost);
 446                 p = *host_buf ? host_buf : "-";
 447                 if ((x = strchr(p, ':')) != NULL)
 448                         *x++ = '\0';
 449                 if (!nflag && isdigit(*p) &&
 450                     (l = inet_addr(p)) != INADDR_NONE &&
 451                     (hp = gethostbyaddr(&l, sizeof(l), AF_INET))) {
 452                         if (domain[0] != '\0') {
 453                                 p = hp->h_name;
 454                                 p += strlen(hp->h_name);
 455                                 p -= strlen(domain);
 456                                 if (p > hp->h_name &&
 457                                     strcasecmp(p, domain) == 0)
 458                                         *p = '\0';
 459                         }
 460                         p = hp->h_name;
 461                 }
 462                 if (nflag && *p && strcmp(p, "-") &&
 463                     inet_addr(p) == INADDR_NONE) {
 464                         hp = gethostbyname(p);
 465
 466                         if (hp != NULL) {
 467                                 struct in_addr in;
 468
 469                                 memmove(&in, hp->h_addr, sizeof(in));
 470                                 p = inet_ntoa(in);
 471                         }
 472                 }
 473                 if (x) {
 474                         (void)snprintf(buf, sizeof(buf), "%s:%s", p, x);
 475                         p = buf;
 476                 }
 477                 if (dflag) {
 478                         for (dkp = ep->dkp; dkp != NULL; dkp = debugproc(dkp)) {
 479                                 char *ptr;
 480
 481                                 ptr = fmt_argv(kvm_getargv(kd, dkp, argwidth),
 482                                     dkp->kp_comm, MAXCOMLEN);
 483                                 if (ptr == NULL)
 484                                         ptr = "-";
 485                                 (void)printf("\t\t%-9d %s\n",
 486                                     dkp->kp_pid, ptr);
 487                         }
 488                 }
 489                 (void)printf("%-*.*s %-*.*s %-*.*s ",
 490                     maxname, maxname, ep->name,
 491                     maxline, maxline,
 492                     strncmp(ep->line, "tty", 3) &&
 493                     strncmp(ep->line, "cua", 3) ?
 494                     ep->line : ep->line + 3,
 495                     maxhost, maxhost, *p ? p : "-");
 496                 then = (time_t)ep->tv.tv_sec;
 497                 pr_attime(&then, &now);
 498                 longidle = pr_idle(ep->idle);
 499                 (void)printf("%.*s\n", argwidth - longidle, ep->args);
 500         }
 501         (void)kvm_close(kd);
 502         exit(0);
 503 }
 504
 505 static void
 506 pr_header(time_t *nowp, int nusers)
 507 {
 508         double avenrun[3];
 509         time_t uptime;
 510         int days, hrs, i, mins, secs;
 511         int mib[2];
 512         size_t size;
 513         char buf[256];
 514
 515         /*
 516          * Print time of day. (use "AM"/"PM" for all locales)
 517          */
 518         (void)strftime_l(buf, sizeof(buf) - 1,
 519                        use_ampm ? "%l:%M%p" : "%k:%M",
 520                        localtime(nowp), NULL);
 521         buf[sizeof(buf) - 1] = '\0';
 522         (void)printf("%s ", buf);
 523
 524         /*
 525          * Print how long system has been up.
 526          * (Found by looking at "boottime" from the kernel)
 527          */
 528         mib[0] = CTL_KERN;
 529         mib[1] = KERN_BOOTTIME;
 530         size = sizeof(boottime);
 531         if (sysctl(mib, 2, &boottime, &size, NULL, 0) != -1 &&
 532             boottime.tv_sec != 0) {
 533                 uptime = now - boottime.tv_sec;
 534                 if (uptime > 60)
 535                         uptime += 30;
 536                 days = uptime / 86400;
 537                 uptime %= 86400;
 538                 hrs = uptime / 3600;
 539                 uptime %= 3600;
 540                 mins = uptime / 60;
 541                 secs = uptime % 60;
 542                 (void)printf(" up");
 543                 if (days > 0)
 544                         (void)printf(" %d day%s,", days, days > 1 ? "s" : "");
 545                 if (hrs > 0 && mins > 0)
 546                         (void)printf(" %2d:%02d,", hrs, mins);
 547                 else if (hrs > 0)
 548                         (void)printf(" %d hr%s,", hrs, hrs > 1 ? "s" : "");
 549                 else if (mins > 0)
 550                         (void)printf(" %d min%s,", mins, mins > 1 ? "s" : "");
 551                 else
 552                         (void)printf(" %d sec%s,", secs, secs > 1 ? "s" : "");
 553         }
 554
 555         /* Print number of users logged in on system */
 556         (void)printf(" %d user%s", nusers, nusers == 1 ? "" : "s");
 557
 558         /*
 559          * Print 1, 5, and 15 minute load averages.
 560          */
 561         if (getloadavg(avenrun, NELEM(avenrun)) == -1)
 562                 (void)printf(", no load average information available\n");
 563         else {
 564                 (void)printf(", load averages:");
 565                 for (i = 0; i < (int)NELEM(avenrun); i++) {
 566                         if (use_comma && i > 0)
 567                                 (void)printf(",");
 568                         (void)printf(" %.2f", avenrun[i]);
 569                 }
 570                 (void)printf("\n");
 571         }
 572 }
 573
 574 static struct stat *
 575 ttystat(char *line, int sz)
 576 {
 577         static struct stat sb;
 578         char ttybuf[MAXPATHLEN];
 579
 580         (void)snprintf(ttybuf, sizeof(ttybuf), "%s%.*s", _PATH_DEV, sz, line);
 581         if (stat(ttybuf, &sb)) {
 582                 warn("%s", ttybuf);
 583                 return (NULL);
 584         }
 585         return (&sb);
 586 }
 587
 588 static void
 589 usage(int wcmd)
 590 {
 591         if (wcmd)
 592                 (void)fprintf(stderr,
 593                     "usage: w [-dhin] [-M core] [-N system] [user ...]\n");
 594         else
 595                 (void)fprintf(stderr, "usage: uptime\n");
 596         exit(1);
 597 }
 598
 599 static int
 600 this_is_uptime(const char *s)
 601 {
 602         const char *u;
 603
 604         if ((u = strrchr(s, '/')) != NULL)
 605                 ++u;
 606         else
 607                 u = s;
 608         if (strcmp(u, "uptime") == 0)
 609                 return (0);
 610         return (-1);
 611 }
 612
 613 #if defined(SUPPORT_UTMP) || defined(SUPPORT_UTMPX)
 614 static void
 615 process(struct entry *ep)
 616 {
 617         struct stat *stp;
 618         time_t touched;
 619         int max;
 620
 621         if ((max = strlen(ep->name)) > maxname)
 622                 maxname = max;
 623         if ((max = strlen(ep->line)) > maxline)
 624                 maxline = max;
 625         if ((max = strlen(ep->host)) > maxhost)
 626                 maxhost = max;
 627
 628         ep->tdev = 0;
 629         ep->idle = (time_t)-1;
 630
 631         if (!(stp = ttystat(ep->line, maxline)))
 632                 return; /* corrupted record */
 633
 634         ep->tdev = stp->st_rdev;
 635 #ifdef CPU_CONSDEV
 636         /*
 637          * If this is the console device, attempt to ascertain
 638          * the true console device dev_t.
 639          */
 640         if (ep->tdev == 0) {
 641                 int mib[2];
 642                 size_t size;
 643
 644                 mib[0] = CTL_MACHDEP;
 645                 mib[1] = CPU_CONSDEV;
 646                 size = sizeof(dev_t);
 647                 (void)sysctl(mib, 2, &ep->tdev, &size, NULL, 0);
 648         }
 649 #endif
 650
 651         touched = stp->st_atime;
 652         if (touched < ep->tv.tv_sec) {
 653                 /* tty untouched since before login */
 654                 touched = ep->tv.tv_sec;
 655         }
 656         if ((ep->idle = now - touched) < 0)
 657                 ep->idle = 0;
 658 }
 659 #endif