src/who.c

   1 /* GNU's who.
   2    Copyright (C) 1992-2002 Free Software Foundation, Inc.
   3
   4    This program is free software; you can redistribute it and/or modify
   5    it under the terms of the GNU General Public License as published by
   6    the Free Software Foundation; either version 2, or (at your option)
   7    any later version.
   8
   9    This program is distributed in the hope that it will be useful,
  10    but WITHOUT ANY WARRANTY; without even the implied warranty of
  11    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12    GNU General Public License for more details.
  13
  14    You should have received a copy of the GNU General Public License
  15    along with this program; if not, write to the Free Software Foundation,
  16    Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */
  17
  18 /* Written by jla; revised by djm; revised again by mstone */
  19
  20 /* Output format:
  21    name [state] line time [activity] [pid] [comment] [exit]
  22    state: -T
  23    name, line, time: not -q
  24    idle: -u
  25 */
  26
  27 #include <config.h>
  28 #include <getopt.h>
  29 #include <stdio.h>
  30
  31 #include <sys/types.h>
  32 #include "system.h"
  33
  34 #include "readutmp.h"
  35 #include "error.h"
  36 #include "closeout.h"
  37
  38 /* The official name of this program (e.g., no `g' prefix).  */
  39 #define PROGRAM_NAME "who"
  40
  41 #define AUTHORS N_ ("Joseph Arceneaux, David MacKenzie, and Michael Stone")
  42
  43 #ifndef MAXHOSTNAMELEN
  44 # define MAXHOSTNAMELEN 64
  45 #endif
  46
  47 #ifndef S_IWGRP
  48 # define S_IWGRP 020
  49 #endif
  50
  51 #ifndef USER_PROCESS
  52 # define USER_PROCESS INT_MAX
  53 #endif
  54
  55 #ifndef RUN_LVL
  56 # define RUN_LVL INT_MAX
  57 #endif
  58
  59 #ifndef INIT_PROCESS
  60 # define INIT_PROCESS INT_MAX
  61 #endif
  62
  63 #ifndef LOGIN_PROCESS
  64 # define LOGIN_PROCESS INT_MAX
  65 #endif
  66
  67 #ifndef DEAD_PROCESS
  68 # define DEAD_PROCESS INT_MAX
  69 #endif
  70
  71 #ifndef BOOT_TIME
  72 # define BOOT_TIME 0
  73 #endif
  74
  75 #ifndef NEW_TIME
  76 # define NEW_TIME 0
  77 #endif
  78
  79 #define IDLESTR_LEN 6
  80
  81 #if HAVE_STRUCT_XTMP_UT_PID
  82 # define UT_PID(U) ((U)->ut_pid)
  83 # define PIDSTR_DECL_AND_INIT(Var, Utmp_ent) \
  84   char Var[INT_STRLEN_BOUND (Utmp_ent->ut_pid) + 1]; \
  85   sprintf (Var, "%d", (int) (Utmp_ent->ut_pid))
  86 #else
  87 # define UT_PID(U) 0
  88 # define PIDSTR_DECL_AND_INIT(Var, Utmp_ent) \
  89   const char *Var = ""
  90 #endif
  91
  92 #if HAVE_STRUCT_XTMP_UT_ID
  93 # define UT_ID(U) ((U)->ut_id)
  94 #else
  95   /* Of course, sizeof "whatever" is the size of a pointer (often 4),
  96      but that's ok, since the actual string has a length of only 2.  */
  97 # define UT_ID(U) "??"
  98 #endif
  99
 100 #define UT_TYPE_UNDEF 255
 101
 102 #if HAVE_STRUCT_XTMP_UT_TYPE
 103 # define UT_TYPE(U) ((U)->ut_type)
 104 #else
 105 # define UT_TYPE(U) UT_TYPE_UNDEF
 106 #endif
 107
 108 #define IS_USER_PROCESS(U)                      \
 109   (UT_USER (utmp_buf)[0]                        \
 110    && (UT_TYPE (utmp_buf) == USER_PROCESS       \
 111        || (UT_TYPE (utmp_buf) == UT_TYPE_UNDEF  \
 112            && UT_TIME_MEMBER (utmp_buf) != 0)))
 113
 114 int gethostname ();
 115 char *ttyname ();
 116 char *canon_host ();
 117
 118 /* The name this program was run with. */
 119 char *program_name;
 120
 121 /* If nonzero, attempt to canonicalize hostnames via a DNS lookup. */
 122 static int do_lookup;
 123
 124 /* If nonzero, display only a list of usernames and count of
 125    the users logged on.
 126    Ignored for `who am i'. */
 127 static int short_list;
 128
 129 /* If nonzero, display only name, line, and time fields */
 130 static int short_output;
 131
 132 /* If nonzero, display the hours:minutes since each user has touched
 133    the keyboard, or "." if within the last minute, or "old" if
 134    not within the last day. */
 135 static int include_idle;
 136
 137 /* If nonzero, display a line at the top describing each field. */
 138 static int include_heading;
 139
 140 /* If nonzero, display a `+' for each user if mesg y, a `-' if mesg n,
 141    or a `?' if their tty cannot be statted. */
 142 static int include_mesg;
 143
 144 /* If nonzero, display process termination & exit status */
 145 static int include_exit;
 146
 147 /* If nonzero, display the last boot time */
 148 static int need_boottime;
 149
 150 /* If nonzero, display dead processes */
 151 static int need_deadprocs;
 152
 153 /* If nonzero, display processes waiting for user login */
 154 static int need_login;
 155
 156 /* If nonzero, display processes started by init */
 157 static int need_initspawn;
 158
 159 /* If nonzero, display the last clock change */
 160 static int need_clockchange;
 161
 162 /* If nonzero, display the current runlevel */
 163 static int need_runlevel;
 164
 165 /* If nonzero, display user processes */
 166 static int need_users;
 167
 168 /* If nonzero, display info only for the controlling tty */
 169 static int my_line_only;
 170
 171 /* for long options with no corresponding short option, use enum */
 172 enum
 173 {
 174   LOOKUP_OPTION = CHAR_MAX + 1,
 175   LOGIN_OPTION
 176 };
 177
 178 static struct option const longopts[] = {
 179   {"all", no_argument, NULL, 'a'},
 180   {"boot", no_argument, NULL, 'b'},
 181   {"count", no_argument, NULL, 'q'},
 182   {"dead", no_argument, NULL, 'd'},
 183   {"heading", no_argument, NULL, 'H'},
 184   {"idle", no_argument, NULL, 'i'},
 185   {"login", no_argument, NULL, LOGIN_OPTION},
 186   {"lookup", no_argument, NULL, LOOKUP_OPTION},
 187   {"message", no_argument, NULL, 'T'},
 188   {"mesg", no_argument, NULL, 'T'},
 189   {"process", no_argument, NULL, 'p'},
 190   {"runlevel", no_argument, NULL, 'r'},
 191   {"short", no_argument, NULL, 's'},
 192   {"time", no_argument, NULL, 't'},
 193   {"users", no_argument, NULL, 'u'},
 194   {"writable", no_argument, NULL, 'T'},
 195   {GETOPT_HELP_OPTION_DECL},
 196   {GETOPT_VERSION_OPTION_DECL},
 197   {NULL, 0, NULL, 0}
 198 };
 199
 200 /* Return a string representing the time between WHEN and the time
 201    that this function is first run.
 202    FIXME: locale? */
 203 static const char *
 204 idle_string (time_t when)
 205 {
 206   static time_t now = 0;
 207   static char idle_hhmm[IDLESTR_LEN];
 208   time_t seconds_idle;
 209
 210   if (now == 0)
 211     time (&now);
 212
 213   seconds_idle = now - when;
 214   if (seconds_idle < 60)        /* One minute. */
 215     return "  .  ";
 216   if (seconds_idle < (24 * 60 * 60))    /* One day. */
 217     {
 218       sprintf (idle_hhmm, "%02d:%02d",
 219                (int) (seconds_idle / (60 * 60)),
 220                (int) ((seconds_idle % (60 * 60)) / 60));
 221       return (const char *) idle_hhmm;
 222     }
 223   return _(" old ");
 224 }
 225
 226 /* Return a standard time string, "mon dd hh:mm"
 227    FIXME: handle localization */
 228 static const char *
 229 time_string (const STRUCT_UTMP *utmp_ent)
 230 {
 231   /* Don't take the address of UT_TIME_MEMBER directly.
 232      Ulrich Drepper wrote:
 233      ``... GNU libc (and perhaps other libcs as well) have extended
 234      utmp file formats which do not use a simple time_t ut_time field.
 235      In glibc, ut_time is a macro which selects for backward compatibility
 236      the tv_sec member of a struct timeval value.''  */
 237   time_t tm = UT_TIME_MEMBER (utmp_ent);
 238
 239   char *ptr = ctime (&tm) + 4;
 240   ptr[12] = '\0';
 241   return ptr;
 242 }
 243
 244 /* Print formatted output line. Uses mostly arbitrary field sizes, probably
 245    will need tweaking if any of the localization stuff is done, or for 64 bit
 246    pids, etc. */
 247 static void
 248 print_line (const char *user, const char state, const char *line,
 249             const char *time_str, const char *idle, const char *pid,
 250             const char *comment, const char *exitstr)
 251 {
 252   printf ("%-8.8s", user ? user : "   .");
 253   if (include_mesg)
 254     printf (" %c", state);
 255   printf (" %-12s", line);
 256   printf (" %-12s", time_str);
 257   if (include_idle && !short_output)
 258     printf (" %-6s", idle);
 259   if (!short_output)
 260     printf (" %10s", pid);
 261   /* FIXME: it's not really clear whether the following should be in short_output.
 262      a strict reading of SUSv2 would suggest not, but I haven't seen any
 263      implementations that actually work that way... */
 264   printf (" %-8s", comment);
 265   if (include_exit && exitstr && *exitstr)
 266     printf (" %-12s", exitstr);
 267   putchar ('\n');
 268 }
 269
 270 /* Send properly parsed USER_PROCESS info to print_line */
 271 static void
 272 print_user (const STRUCT_UTMP *utmp_ent)
 273 {
 274   struct stat stats;
 275   time_t last_change;
 276   char mesg;
 277   char idlestr[IDLESTR_LEN];
 278   static char *hoststr;
 279   static int hostlen;
 280
 281 #define DEV_DIR_WITH_TRAILING_SLASH "/dev/"
 282 #define DEV_DIR_LEN (sizeof (DEV_DIR_WITH_TRAILING_SLASH) - 1)
 283
 284   char line[sizeof (utmp_ent->ut_line) + DEV_DIR_LEN + 1];
 285   PIDSTR_DECL_AND_INIT (pidstr, utmp_ent);
 286
 287   /* Copy ut_line into LINE, prepending `/dev/' if ut_line is not
 288      already an absolute pathname.  Some system may put the full,
 289      absolute pathname in ut_line.  */
 290   if (utmp_ent->ut_line[0] == '/')
 291     {
 292       strncpy (line, utmp_ent->ut_line, sizeof (utmp_ent->ut_line));
 293       line[sizeof (utmp_ent->ut_line)] = '\0';
 294     }
 295   else
 296     {
 297       strcpy (line, DEV_DIR_WITH_TRAILING_SLASH);
 298       strncpy (line + DEV_DIR_LEN, utmp_ent->ut_line,
 299                sizeof (utmp_ent->ut_line));
 300       line[DEV_DIR_LEN + sizeof (utmp_ent->ut_line)] = '\0';
 301     }
 302
 303   if (stat (line, &stats) == 0)
 304     {
 305       mesg = (stats.st_mode & S_IWGRP) ? '+' : '-';
 306       last_change = stats.st_atime;
 307     }
 308   else
 309     {
 310       mesg = '?';
 311       last_change = 0;
 312     }
 313
 314   if (last_change)
 315     sprintf (idlestr, "%.6s", idle_string (last_change));
 316   else
 317     sprintf (idlestr, "  ?");
 318
 319 #if HAVE_UT_HOST
 320   if (utmp_ent->ut_host[0])
 321     {
 322       char ut_host[sizeof (utmp_ent->ut_host) + 1];
 323       char *host = 0, *display = 0;
 324
 325       /* Copy the host name into UT_HOST, and ensure it's nul terminated. */
 326       strncpy (ut_host, utmp_ent->ut_host, (int) sizeof (utmp_ent->ut_host));
 327       ut_host[sizeof (utmp_ent->ut_host)] = '\0';
 328
 329       /* Look for an X display.  */
 330       display = strrchr (ut_host, ':');
 331       if (display)
 332         *display++ = '\0';
 333
 334       if (*ut_host && do_lookup)
 335         {
 336           /* See if we can canonicalize it.  */
 337           host = canon_host (ut_host);
 338         }
 339
 340       if (! host)
 341         host = ut_host;
 342
 343       if (display)
 344         {
 345           if (hostlen < strlen (host) + strlen (display) + 4)
 346             {
 347               hostlen = strlen (host) + strlen (display) + 4;
 348               hoststr = (char *) realloc (hoststr, hostlen);
 349             }
 350           sprintf (hoststr, "(%s:%s)", host, display);
 351         }
 352       else
 353         {
 354           if (hostlen < strlen (host) + 3)
 355             {
 356               hostlen = strlen (host) + 3;
 357               hoststr = (char *) realloc (hoststr, hostlen);
 358             }
 359           sprintf (hoststr, "(%s)", host);
 360         }
 361     }
 362   else
 363     {
 364       if (hostlen < 1)
 365         {
 366           hostlen = 1;
 367           hoststr = (char *) realloc (hoststr, hostlen);
 368         }
 369       stpcpy (hoststr, "");
 370     }
 371 #endif
 372
 373   print_line (UT_USER (utmp_ent), mesg, utmp_ent->ut_line,
 374               time_string (utmp_ent), idlestr, pidstr,
 375               hoststr ? hoststr : "", "");
 376 }
 377
 378 static void
 379 print_boottime (const STRUCT_UTMP *utmp_ent)
 380 {
 381   print_line ("", ' ', "system boot", time_string (utmp_ent), "", "", "", "");
 382 }
 383
 384 static char *
 385 make_id_equals_comment (STRUCT_UTMP const *utmp_ent)
 386 {
 387   char *comment = xmalloc (sizeof (_("id=")) + sizeof UT_ID (utmp_ent) + 1);
 388
 389   /* Cast field width argument to `int' to avoid warning from gcc.  */
 390   sprintf (comment, "%s%.*s", _("id="), (int) sizeof UT_ID (utmp_ent),
 391            UT_ID (utmp_ent));
 392   return comment;
 393 }
 394
 395 static void
 396 print_deadprocs (const STRUCT_UTMP *utmp_ent)
 397 {
 398   static char *exitstr;
 399   char *comment = make_id_equals_comment (utmp_ent);
 400   PIDSTR_DECL_AND_INIT (pidstr, utmp_ent);
 401
 402   if (!exitstr)
 403     exitstr = xmalloc (sizeof (_("term="))
 404                        + INT_STRLEN_BOUND (UT_EXIT_E_TERMINATION (utmp_ent)) + 1
 405                        + sizeof (_("exit="))
 406                        + INT_STRLEN_BOUND (UT_EXIT_E_EXIT (utmp_ent))
 407                        + 1);
 408   sprintf (exitstr, "%s%d %s%d", _("term="), UT_EXIT_E_TERMINATION (utmp_ent),
 409            _("exit="), UT_EXIT_E_EXIT (utmp_ent));
 410
 411   /* FIXME: add idle time? */
 412
 413   print_line ("", ' ', utmp_ent->ut_line,
 414               time_string (utmp_ent), "", pidstr, comment, exitstr);
 415   free (comment);
 416 }
 417
 418 static void
 419 print_login (const STRUCT_UTMP *utmp_ent)
 420 {
 421   char *comment = make_id_equals_comment (utmp_ent);
 422   PIDSTR_DECL_AND_INIT (pidstr, utmp_ent);
 423
 424   /* FIXME: add idle time? */
 425
 426   print_line ("LOGIN", ' ', utmp_ent->ut_line,
 427               time_string (utmp_ent), "", pidstr, comment, "");
 428   free (comment);
 429 }
 430
 431 static void
 432 print_initspawn (const STRUCT_UTMP *utmp_ent)
 433 {
 434   char *comment = make_id_equals_comment (utmp_ent);
 435   PIDSTR_DECL_AND_INIT (pidstr, utmp_ent);
 436
 437   print_line ("", ' ', utmp_ent->ut_line,
 438               time_string (utmp_ent), "", pidstr, comment, "");
 439   free (comment);
 440 }
 441
 442 static void
 443 print_clockchange (const STRUCT_UTMP *utmp_ent)
 444 {
 445   /* FIXME: handle NEW_TIME & OLD_TIME both */
 446   print_line ("", ' ', _("clock change"),
 447               time_string (utmp_ent), "", "", "", "");
 448 }
 449
 450 static void
 451 print_runlevel (const STRUCT_UTMP *utmp_ent)
 452 {
 453   static char *runlevline, *comment;
 454   int last = UT_PID (utmp_ent) / 256;
 455   int curr = UT_PID (utmp_ent) % 256;
 456
 457   if (!runlevline)
 458     runlevline = xmalloc (sizeof (_("run-level")) + 3);
 459   sprintf (runlevline, "%s %c", _("run-level"), curr);
 460
 461   if (!comment)
 462     comment = xmalloc (sizeof (_("last=")) + 2);
 463   sprintf (comment, "%s%c", _("last="), (last == 'N') ? 'S' : last);
 464
 465   print_line ("", ' ', runlevline, time_string (utmp_ent),
 466               "", "", comment, "");
 467
 468   return;
 469 }
 470
 471 /* Print the username of each valid entry and the number of valid entries
 472    in UTMP_BUF, which should have N elements. */
 473 static void
 474 list_entries_who (int n, const STRUCT_UTMP *utmp_buf)
 475 {
 476   int entries = 0;
 477
 478   while (n--)
 479     {
 480       if (UT_USER (utmp_buf)[0] && UT_TYPE (utmp_buf) == USER_PROCESS)
 481         {
 482           char *trimmed_name;
 483
 484           trimmed_name = extract_trimmed_name (utmp_buf);
 485
 486           printf ("%s ", trimmed_name);
 487           free (trimmed_name);
 488           entries++;
 489         }
 490       utmp_buf++;
 491     }
 492   printf (_("\n# users=%u\n"), entries);
 493 }
 494
 495 static void
 496 print_heading (void)
 497 {
 498   print_line (_("NAME"), ' ', _("LINE"), _("TIME"), _("IDLE"), _("PID"),
 499               _("COMMENT"), _("EXIT"));
 500 }
 501
 502 /* Display UTMP_BUF, which should have N entries. */
 503 static void
 504 scan_entries (int n, const STRUCT_UTMP *utmp_buf)
 505 {
 506   char *ttyname_b IF_LINT ( = NULL);
 507
 508   if (include_heading)
 509     print_heading ();
 510
 511   if (my_line_only)
 512     {
 513       ttyname_b = ttyname (0);
 514       if (!ttyname_b)
 515         return;
 516       if (strncmp (ttyname_b, DEV_DIR_WITH_TRAILING_SLASH, DEV_DIR_LEN) == 0)
 517         ttyname_b += DEV_DIR_LEN;       /* Discard /dev/ prefix.  */
 518     }
 519
 520   while (n--)
 521     {
 522       if (!my_line_only ||
 523           strncmp (ttyname_b, utmp_buf->ut_line,
 524                    sizeof (utmp_buf->ut_line)) == 0)
 525         {
 526           if (need_users && IS_USER_PROCESS (utmp_buf))
 527             print_user (utmp_buf);
 528           else if (need_runlevel && UT_TYPE (utmp_buf) == RUN_LVL)
 529             print_runlevel (utmp_buf);
 530           else if (need_boottime && UT_TYPE (utmp_buf) == BOOT_TIME)
 531             print_boottime (utmp_buf);
 532           /* I've never seen one of these, so I don't know what it should
 533              look like :^)
 534              FIXME: handle OLD_TIME also, perhaps show the delta? */
 535           else if (need_clockchange && UT_TYPE (utmp_buf) == NEW_TIME)
 536             print_clockchange (utmp_buf);
 537           else if (need_initspawn && UT_TYPE (utmp_buf) == INIT_PROCESS)
 538             print_initspawn (utmp_buf);
 539           else if (need_login && UT_TYPE (utmp_buf) == LOGIN_PROCESS)
 540             print_login (utmp_buf);
 541           else if (need_deadprocs && UT_TYPE (utmp_buf) == DEAD_PROCESS)
 542             print_deadprocs (utmp_buf);
 543         }
 544
 545       utmp_buf++;
 546     }
 547 }
 548
 549 /* Display a list of who is on the system, according to utmp file filename. */
 550 static void
 551 who (const char *filename)
 552 {
 553   int n_users;
 554   STRUCT_UTMP *utmp_buf;
 555   int fail = read_utmp (filename, &n_users, &utmp_buf);
 556
 557   if (fail)
 558     error (1, errno, "%s", filename);
 559
 560   if (short_list)
 561     list_entries_who (n_users, utmp_buf);
 562   else
 563     scan_entries (n_users, utmp_buf);
 564 }
 565
 566 void
 567 usage (int status)
 568 {
 569   if (status != 0)
 570     fprintf (stderr, _("Try `%s --help' for more information.\n"),
 571              program_name);
 572   else
 573     {
 574       printf (_("Usage: %s [OPTION]... [ FILE | ARG1 ARG2 ]\n"), program_name);
 575       fputs (_("\
 576 \n\
 577   -a, --all         same as -b -d --login -p -r -t -T -u\n\
 578   -b, --boot        time of last system boot\n\
 579   -d, --dead        print dead processes\n\
 580   -H, --heading     print line of column headings\n\
 581 "), stdout);
 582       fputs (_("\
 583   -i, --idle        add idle time as HOURS:MINUTES, . or old\n\
 584                     (deprecated, use -u)\n\
 585       --login       print system login processes\n\
 586                     (equivalent to SUS -l)\n\
 587 "), stdout);
 588       fputs (_("\
 589   -l, --lookup      attempt to canonicalize hostnames via DNS\n\
 590                     (-l is deprecated, use --lookup)\n\
 591   -m                only hostname and user associated with stdin\n\
 592   -p, --process     print active processes spawned by init\n\
 593 "), stdout);
 594       fputs (_("\
 595   -q, --count       all login names and number of users logged on\n\
 596   -r, --runlevel    print current runlevel\n\
 597   -s, --short       print only name, line, and time (default)\n\
 598   -t, --time        print last system clock change\n\
 599 "), stdout);
 600       fputs (_("\
 601   -T, -w, --mesg    add user's message status as +, - or ?\n\
 602   -u, --users       list users logged in\n\
 603       --message     same as -T\n\
 604       --writable    same as -T\n\
 605 "), stdout);
 606       fputs (HELP_OPTION_DESCRIPTION, stdout);
 607       fputs (VERSION_OPTION_DESCRIPTION, stdout);
 608       printf (_("\
 609 \n\
 610 If FILE is not specified, use %s.  %s as FILE is common.\n\
 611 If ARG1 ARG2 given, -m presumed: `am i' or `mom likes' are usual.\n\
 612 "), UTMP_FILE, WTMP_FILE);
 613       printf (_("\nReport bugs to <%s>.\n"), PACKAGE_BUGREPORT);
 614     }
 615   exit (status);
 616 }
 617
 618 int
 619 main (int argc, char **argv)
 620 {
 621   int optc, longind;
 622   int assumptions = 1;
 623
 624   program_name = argv[0];
 625   setlocale (LC_ALL, "");
 626   bindtextdomain (PACKAGE, LOCALEDIR);
 627   textdomain (PACKAGE);
 628
 629   atexit (close_stdout);
 630
 631   while ((optc = getopt_long (argc, argv, "abdilmpqrstuwHT", longopts,
 632                               &longind)) != -1)
 633     {
 634       switch (optc)
 635         {
 636         case 0:
 637           break;
 638
 639         case 'a':
 640           need_boottime = 1;
 641           need_deadprocs = 1;
 642           need_login = 1;
 643           need_initspawn = 1;
 644           need_runlevel = 1;
 645           need_clockchange = 1;
 646           need_users = 1;
 647           include_mesg = 1;
 648           include_idle = 1;
 649           include_exit = 1;
 650           assumptions = 0;
 651           break;
 652
 653         case 'b':
 654           need_boottime = 1;
 655           assumptions = 0;
 656           break;
 657
 658         case 'd':
 659           need_deadprocs = 1;
 660           include_idle = 1;
 661           include_exit = 1;
 662           assumptions = 0;
 663           break;
 664
 665         case 'H':
 666           include_heading = 1;
 667           break;
 668
 669           /* FIXME: This should be -l in a future version */
 670         case LOGIN_OPTION:
 671           need_login = 1;
 672           include_idle = 1;
 673           assumptions = 0;
 674           break;
 675
 676         case 'm':
 677           my_line_only = 1;
 678           break;
 679
 680         case 'p':
 681           need_initspawn = 1;
 682           assumptions = 0;
 683           break;
 684
 685         case 'q':
 686           short_list = 1;
 687           break;
 688
 689         case 'r':
 690           need_runlevel = 1;
 691           include_idle = 1;
 692           assumptions = 0;
 693           break;
 694
 695         case 's':
 696           short_output = 1;
 697           break;
 698
 699         case 't':
 700           need_clockchange = 1;
 701           assumptions = 0;
 702           break;
 703
 704         case 'T':
 705         case 'w':
 706           include_mesg = 1;
 707           break;
 708
 709         case 'i':
 710           error (0, 0,
 711                  _("Warning: -i will be removed in a future release; \
 712   use -u instead"));
 713           /* Fall through.  */
 714         case 'u':
 715           need_users = 1;
 716           include_idle = 1;
 717           assumptions = 0;
 718           break;
 719
 720         case 'l':
 721           error (0, 0,
 722                  _("Warning: the meaning of '-l' will change in a future\
 723  release to conform to POSIX"));
 724         case LOOKUP_OPTION:
 725           do_lookup = 1;
 726           break;
 727
 728           case_GETOPT_HELP_CHAR;
 729
 730           case_GETOPT_VERSION_CHAR (PROGRAM_NAME, AUTHORS);
 731
 732         default:
 733           usage (1);
 734         }
 735     }
 736
 737   if (assumptions)
 738     {
 739       need_users = 1;
 740       short_output = 1;
 741     }
 742
 743   if (include_exit)
 744     {
 745       short_output = 0;
 746     }
 747
 748   switch (argc - optind)
 749     {
 750     case 0:                     /* who */
 751       who (UTMP_FILE);
 752       break;
 753
 754     case 1:                     /* who <utmp file> */
 755       who (argv[optind]);
 756       break;
 757
 758     case 2:                     /* who <blurf> <glop> */
 759       my_line_only = 1;
 760       who (UTMP_FILE);
 761       break;
 762
 763     default:                    /* lose */
 764       error (0, 0, _("too many arguments"));
 765       usage (1);
 766     }
 767
 768   exit (0);
 769 }