src/who.c

   1 /* GNU's who.
   2    Copyright (C) 1992-2004 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
  37 /* The official name of this program (e.g., no `g' prefix).  */
  38 #define PROGRAM_NAME "who"
  39
  40 #define AUTHORS "Joseph Arceneaux", "David MacKenzie", "Michael Stone"
  41
  42 #ifndef MAXHOSTNAMELEN
  43 # define MAXHOSTNAMELEN 64
  44 #endif
  45
  46 #ifndef S_IWGRP
  47 # define S_IWGRP 020
  48 #endif
  49
  50 #ifndef USER_PROCESS
  51 # define USER_PROCESS INT_MAX
  52 #endif
  53
  54 #ifndef RUN_LVL
  55 # define RUN_LVL INT_MAX
  56 #endif
  57
  58 #ifndef INIT_PROCESS
  59 # define INIT_PROCESS INT_MAX
  60 #endif
  61
  62 #ifndef LOGIN_PROCESS
  63 # define LOGIN_PROCESS INT_MAX
  64 #endif
  65
  66 #ifndef DEAD_PROCESS
  67 # define DEAD_PROCESS INT_MAX
  68 #endif
  69
  70 #ifndef BOOT_TIME
  71 # define BOOT_TIME 0
  72 #endif
  73
  74 #ifndef NEW_TIME
  75 # define NEW_TIME 0
  76 #endif
  77
  78 #define IDLESTR_LEN 6
  79
  80 #if HAVE_STRUCT_XTMP_UT_PID
  81 # define UT_PID(U) ((U)->ut_pid)
  82 # define PIDSTR_DECL_AND_INIT(Var, Utmp_ent) \
  83   char Var[INT_STRLEN_BOUND (Utmp_ent->ut_pid) + 1]; \
  84   sprintf (Var, "%d", (int) (Utmp_ent->ut_pid))
  85 #else
  86 # define UT_PID(U) 0
  87 # define PIDSTR_DECL_AND_INIT(Var, Utmp_ent) \
  88   const char *Var = ""
  89 #endif
  90
  91 #if HAVE_STRUCT_XTMP_UT_ID
  92 # define UT_ID(U) ((U)->ut_id)
  93 #else
  94   /* Of course, sizeof "whatever" is the size of a pointer (often 4),
  95      but that's ok, since the actual string has a length of only 2.  */
  96 # define UT_ID(U) "??"
  97 #endif
  98
  99 #define UT_TYPE_UNDEF 255
 100
 101 #if HAVE_STRUCT_XTMP_UT_TYPE
 102 # define UT_TYPE(U) ((U)->ut_type)
 103 #else
 104 # define UT_TYPE(U) UT_TYPE_UNDEF
 105 #endif
 106
 107 #define IS_USER_PROCESS(U)                      \
 108   (UT_USER (utmp_buf)[0]                        \
 109    && (UT_TYPE (utmp_buf) == USER_PROCESS       \
 110        || (UT_TYPE (utmp_buf) == UT_TYPE_UNDEF  \
 111            && UT_TIME_MEMBER (utmp_buf) != 0)))
 112
 113 int gethostname ();
 114 char *ttyname ();
 115 char *canon_host ();
 116
 117 /* The name this program was run with. */
 118 char *program_name;
 119
 120 /* If nonzero, attempt to canonicalize hostnames via a DNS lookup. */
 121 static int do_lookup;
 122
 123 /* If nonzero, display only a list of usernames and count of
 124    the users logged on.
 125    Ignored for `who am i'. */
 126 static int short_list;
 127
 128 /* If nonzero, display only name, line, and time fields */
 129 static int short_output;
 130
 131 /* If nonzero, display the hours:minutes since each user has touched
 132    the keyboard, or "." if within the last minute, or "old" if
 133    not within the last day. */
 134 static int include_idle;
 135
 136 /* If nonzero, display a line at the top describing each field. */
 137 static int include_heading;
 138
 139 /* If nonzero, display a `+' for each user if mesg y, a `-' if mesg n,
 140    or a `?' if their tty cannot be statted. */
 141 static int include_mesg;
 142
 143 /* If nonzero, display process termination & exit status */
 144 static int include_exit;
 145
 146 /* If nonzero, display the last boot time */
 147 static int need_boottime;
 148
 149 /* If nonzero, display dead processes */
 150 static int need_deadprocs;
 151
 152 /* If nonzero, display processes waiting for user login */
 153 static int need_login;
 154
 155 /* If nonzero, display processes started by init */
 156 static int need_initspawn;
 157
 158 /* If nonzero, display the last clock change */
 159 static int need_clockchange;
 160
 161 /* If nonzero, display the current runlevel */
 162 static int need_runlevel;
 163
 164 /* If nonzero, display user processes */
 165 static int need_users;
 166
 167 /* If nonzero, display info only for the controlling tty */
 168 static int my_line_only;
 169
 170 /* for long options with no corresponding short option, use enum */
 171 enum
 172 {
 173   LOOKUP_OPTION = CHAR_MAX + 1
 174 };
 175
 176 static struct option const longopts[] = {
 177   {"all", no_argument, NULL, 'a'},
 178   {"boot", no_argument, NULL, 'b'},
 179   {"count", no_argument, NULL, 'q'},
 180   {"dead", no_argument, NULL, 'd'},
 181   {"heading", no_argument, NULL, 'H'},
 182   {"idle", no_argument, NULL, 'i'},
 183   {"login", no_argument, NULL, 'l'},
 184   {"lookup", no_argument, NULL, LOOKUP_OPTION},
 185   {"message", no_argument, NULL, 'T'},
 186   {"mesg", no_argument, NULL, 'T'},
 187   {"process", no_argument, NULL, 'p'},
 188   {"runlevel", no_argument, NULL, 'r'},
 189   {"short", no_argument, NULL, 's'},
 190   {"time", no_argument, NULL, 't'},
 191   {"users", no_argument, NULL, 'u'},
 192   {"writable", no_argument, NULL, 'T'},
 193   {GETOPT_HELP_OPTION_DECL},
 194   {GETOPT_VERSION_OPTION_DECL},
 195   {NULL, 0, NULL, 0}
 196 };
 197
 198 /* Return a string representing the time between WHEN and the time
 199    that this function is first run.
 200    FIXME: locale? */
 201 static const char *
 202 idle_string (time_t when)
 203 {
 204   static time_t now = 0;
 205   static char idle_hhmm[IDLESTR_LEN];
 206   time_t seconds_idle;
 207
 208   if (now == 0)
 209     time (&now);
 210
 211   seconds_idle = now - when;
 212   if (seconds_idle < 60)        /* One minute. */
 213     return "  .  ";
 214   if (seconds_idle < (24 * 60 * 60))    /* One day. */
 215     {
 216       sprintf (idle_hhmm, "%02d:%02d",
 217                (int) (seconds_idle / (60 * 60)),
 218                (int) ((seconds_idle % (60 * 60)) / 60));
 219       return (const char *) idle_hhmm;
 220     }
 221   return _(" old ");
 222 }
 223
 224 /* Return a standard time string, "mon dd hh:mm"
 225    FIXME: handle localization */
 226 static const char *
 227 time_string (const STRUCT_UTMP *utmp_ent)
 228 {
 229   /* Don't take the address of UT_TIME_MEMBER directly.
 230      Ulrich Drepper wrote:
 231      ``... GNU libc (and perhaps other libcs as well) have extended
 232      utmp file formats which do not use a simple time_t ut_time field.
 233      In glibc, ut_time is a macro which selects for backward compatibility
 234      the tv_sec member of a struct timeval value.''  */
 235   time_t tm = UT_TIME_MEMBER (utmp_ent);
 236
 237   char *ptr = ctime (&tm) + 4;
 238   ptr[12] = '\0';
 239   return ptr;
 240 }
 241
 242 /* Print formatted output line. Uses mostly arbitrary field sizes, probably
 243    will need tweaking if any of the localization stuff is done, or for 64 bit
 244    pids, etc. */
 245 static void
 246 print_line (const char *user, const char state, const char *line,
 247             const char *time_str, const char *idle, const char *pid,
 248             const char *comment, const char *exitstr)
 249 {
 250   static char mesg[3] = { ' ', 'x', '\0' };
 251   char *buf;
 252   char x_idle[1 + IDLESTR_LEN + 1];
 253   char x_pid[1 + INT_STRLEN_BOUND (pid_t) + 1];
 254   char *x_exitstr;
 255   int err;
 256
 257   mesg[1] = state;
 258
 259   if (include_idle && !short_output)
 260     sprintf (x_idle, " %-6s", idle);
 261   else
 262     *x_idle = '\0';
 263
 264   if (!short_output)
 265     sprintf (x_pid, " %10s", pid);
 266   else
 267     *x_pid = '\0';
 268
 269   x_exitstr = xmalloc (include_exit ? 1 + MAX (12, strlen (exitstr)) + 1 : 1);
 270   if (include_exit)
 271     sprintf (x_exitstr, " %-12s", exitstr);
 272   else
 273     *x_exitstr = '\0';
 274
 275   err = asprintf (&buf,
 276                   "%-8.8s"
 277                   "%s"
 278                   " %-12s"
 279                   " %-12s"
 280                   "%s"
 281                   "%s"
 282                   " %-8s"
 283                   "%s"
 284                   ,
 285                   user ? user : "   .",
 286                   include_mesg ? mesg : "",
 287                   line,
 288                   time_str,
 289                   x_idle,
 290                   x_pid,
 291                   /* FIXME: it's not really clear whether the following
 292                      field should be in the short_output.  A strict reading
 293                      of SUSv2 would suggest not, but I haven't seen any
 294                      implementations that actually work that way... */
 295                   comment,
 296                   x_exitstr
 297                   );
 298   if (err == -1)
 299     xalloc_die ();
 300
 301   {
 302     /* Remove any trailing spaces.  */
 303     char *p = buf + strlen (buf);
 304     while (*--p == ' ')
 305       /* empty */;
 306     *(p + 1) = '\0';
 307   }
 308
 309   puts (buf);
 310   free (buf);
 311   free (x_exitstr);
 312 }
 313
 314 /* Send properly parsed USER_PROCESS info to print_line */
 315 static void
 316 print_user (const STRUCT_UTMP *utmp_ent)
 317 {
 318   struct stat stats;
 319   time_t last_change;
 320   char mesg;
 321   char idlestr[IDLESTR_LEN];
 322   static char *hoststr;
 323   static size_t hostlen;
 324
 325 #define DEV_DIR_WITH_TRAILING_SLASH "/dev/"
 326 #define DEV_DIR_LEN (sizeof (DEV_DIR_WITH_TRAILING_SLASH) - 1)
 327
 328   char line[sizeof (utmp_ent->ut_line) + DEV_DIR_LEN + 1];
 329   PIDSTR_DECL_AND_INIT (pidstr, utmp_ent);
 330
 331   /* Copy ut_line into LINE, prepending `/dev/' if ut_line is not
 332      already an absolute pathname.  Some system may put the full,
 333      absolute pathname in ut_line.  */
 334   if (utmp_ent->ut_line[0] == '/')
 335     {
 336       strncpy (line, utmp_ent->ut_line, sizeof (utmp_ent->ut_line));
 337       line[sizeof (utmp_ent->ut_line)] = '\0';
 338     }
 339   else
 340     {
 341       strcpy (line, DEV_DIR_WITH_TRAILING_SLASH);
 342       strncpy (line + DEV_DIR_LEN, utmp_ent->ut_line,
 343                sizeof (utmp_ent->ut_line));
 344       line[DEV_DIR_LEN + sizeof (utmp_ent->ut_line)] = '\0';
 345     }
 346
 347   if (stat (line, &stats) == 0)
 348     {
 349       mesg = (stats.st_mode & S_IWGRP) ? '+' : '-';
 350       last_change = stats.st_atime;
 351     }
 352   else
 353     {
 354       mesg = '?';
 355       last_change = 0;
 356     }
 357
 358   if (last_change)
 359     sprintf (idlestr, "%.6s", idle_string (last_change));
 360   else
 361     sprintf (idlestr, "  ?");
 362
 363 #if HAVE_UT_HOST
 364   if (utmp_ent->ut_host[0])
 365     {
 366       char ut_host[sizeof (utmp_ent->ut_host) + 1];
 367       char *host = 0, *display = 0;
 368
 369       /* Copy the host name into UT_HOST, and ensure it's nul terminated. */
 370       strncpy (ut_host, utmp_ent->ut_host, (int) sizeof (utmp_ent->ut_host));
 371       ut_host[sizeof (utmp_ent->ut_host)] = '\0';
 372
 373       /* Look for an X display.  */
 374       display = strchr (ut_host, ':');
 375       if (display)
 376         *display++ = '\0';
 377
 378       if (*ut_host && do_lookup)
 379         {
 380           /* See if we can canonicalize it.  */
 381           host = canon_host (ut_host);
 382         }
 383
 384       if (! host)
 385         host = ut_host;
 386
 387       if (display)
 388         {
 389           if (hostlen < strlen (host) + strlen (display) + 4)
 390             {
 391               hostlen = strlen (host) + strlen (display) + 4;
 392               hoststr = (char *) realloc (hoststr, hostlen);
 393             }
 394           sprintf (hoststr, "(%s:%s)", host, display);
 395         }
 396       else
 397         {
 398           if (hostlen < strlen (host) + 3)
 399             {
 400               hostlen = strlen (host) + 3;
 401               hoststr = (char *) realloc (hoststr, hostlen);
 402             }
 403           sprintf (hoststr, "(%s)", host);
 404         }
 405     }
 406   else
 407     {
 408       if (hostlen < 1)
 409         {
 410           hostlen = 1;
 411           hoststr = (char *) realloc (hoststr, hostlen);
 412         }
 413       stpcpy (hoststr, "");
 414     }
 415 #endif
 416
 417   print_line (UT_USER (utmp_ent), mesg, utmp_ent->ut_line,
 418               time_string (utmp_ent), idlestr, pidstr,
 419               hoststr ? hoststr : "", "");
 420 }
 421
 422 static void
 423 print_boottime (const STRUCT_UTMP *utmp_ent)
 424 {
 425   print_line ("", ' ', "system boot", time_string (utmp_ent), "", "", "", "");
 426 }
 427
 428 static char *
 429 make_id_equals_comment (STRUCT_UTMP const *utmp_ent)
 430 {
 431   char *comment = xmalloc (strlen (_("id=")) + sizeof UT_ID (utmp_ent) + 1);
 432
 433   /* Cast field width argument to `int' to avoid warning from gcc.  */
 434   sprintf (comment, "%s%.*s", _("id="), (int) sizeof UT_ID (utmp_ent),
 435            UT_ID (utmp_ent));
 436   return comment;
 437 }
 438
 439 static void
 440 print_deadprocs (const STRUCT_UTMP *utmp_ent)
 441 {
 442   static char *exitstr;
 443   char *comment = make_id_equals_comment (utmp_ent);
 444   PIDSTR_DECL_AND_INIT (pidstr, utmp_ent);
 445
 446   if (!exitstr)
 447     exitstr = xmalloc (strlen (_("term="))
 448                        + INT_STRLEN_BOUND (UT_EXIT_E_TERMINATION (utmp_ent)) + 1
 449                        + strlen (_("exit="))
 450                        + INT_STRLEN_BOUND (UT_EXIT_E_EXIT (utmp_ent))
 451                        + 1);
 452   sprintf (exitstr, "%s%d %s%d", _("term="), UT_EXIT_E_TERMINATION (utmp_ent),
 453            _("exit="), UT_EXIT_E_EXIT (utmp_ent));
 454
 455   /* FIXME: add idle time? */
 456
 457   print_line ("", ' ', utmp_ent->ut_line,
 458               time_string (utmp_ent), "", pidstr, comment, exitstr);
 459   free (comment);
 460 }
 461
 462 static void
 463 print_login (const STRUCT_UTMP *utmp_ent)
 464 {
 465   char *comment = make_id_equals_comment (utmp_ent);
 466   PIDSTR_DECL_AND_INIT (pidstr, utmp_ent);
 467
 468   /* FIXME: add idle time? */
 469
 470   print_line ("LOGIN", ' ', utmp_ent->ut_line,
 471               time_string (utmp_ent), "", pidstr, comment, "");
 472   free (comment);
 473 }
 474
 475 static void
 476 print_initspawn (const STRUCT_UTMP *utmp_ent)
 477 {
 478   char *comment = make_id_equals_comment (utmp_ent);
 479   PIDSTR_DECL_AND_INIT (pidstr, utmp_ent);
 480
 481   print_line ("", ' ', utmp_ent->ut_line,
 482               time_string (utmp_ent), "", pidstr, comment, "");
 483   free (comment);
 484 }
 485
 486 static void
 487 print_clockchange (const STRUCT_UTMP *utmp_ent)
 488 {
 489   /* FIXME: handle NEW_TIME & OLD_TIME both */
 490   print_line ("", ' ', _("clock change"),
 491               time_string (utmp_ent), "", "", "", "");
 492 }
 493
 494 static void
 495 print_runlevel (const STRUCT_UTMP *utmp_ent)
 496 {
 497   static char *runlevline, *comment;
 498   int last = UT_PID (utmp_ent) / 256;
 499   int curr = UT_PID (utmp_ent) % 256;
 500
 501   if (!runlevline)
 502     runlevline = xmalloc (strlen (_("run-level")) + 3);
 503   sprintf (runlevline, "%s %c", _("run-level"), curr);
 504
 505   if (!comment)
 506     comment = xmalloc (strlen (_("last=")) + 2);
 507   sprintf (comment, "%s%c", _("last="), (last == 'N') ? 'S' : last);
 508
 509   print_line ("", ' ', runlevline, time_string (utmp_ent),
 510               "", "", comment, "");
 511
 512   return;
 513 }
 514
 515 /* Print the username of each valid entry and the number of valid entries
 516    in UTMP_BUF, which should have N elements. */
 517 static void
 518 list_entries_who (int n, const STRUCT_UTMP *utmp_buf)
 519 {
 520   int entries = 0;
 521
 522   while (n--)
 523     {
 524       if (UT_USER (utmp_buf)[0] && UT_TYPE (utmp_buf) == USER_PROCESS)
 525         {
 526           char *trimmed_name;
 527
 528           trimmed_name = extract_trimmed_name (utmp_buf);
 529
 530           printf ("%s ", trimmed_name);
 531           free (trimmed_name);
 532           entries++;
 533         }
 534       utmp_buf++;
 535     }
 536   printf (_("\n# users=%u\n"), entries);
 537 }
 538
 539 static void
 540 print_heading (void)
 541 {
 542   print_line (_("NAME"), ' ', _("LINE"), _("TIME"), _("IDLE"), _("PID"),
 543               _("COMMENT"), _("EXIT"));
 544 }
 545
 546 /* Display UTMP_BUF, which should have N entries. */
 547 static void
 548 scan_entries (int n, const STRUCT_UTMP *utmp_buf)
 549 {
 550   char *ttyname_b IF_LINT ( = NULL);
 551
 552   if (include_heading)
 553     print_heading ();
 554
 555   if (my_line_only)
 556     {
 557       ttyname_b = ttyname (0);
 558       if (!ttyname_b)
 559         return;
 560       if (strncmp (ttyname_b, DEV_DIR_WITH_TRAILING_SLASH, DEV_DIR_LEN) == 0)
 561         ttyname_b += DEV_DIR_LEN;       /* Discard /dev/ prefix.  */
 562     }
 563
 564   while (n--)
 565     {
 566       if (!my_line_only ||
 567           strncmp (ttyname_b, utmp_buf->ut_line,
 568                    sizeof (utmp_buf->ut_line)) == 0)
 569         {
 570           if (need_users && IS_USER_PROCESS (utmp_buf))
 571             print_user (utmp_buf);
 572           else if (need_runlevel && UT_TYPE (utmp_buf) == RUN_LVL)
 573             print_runlevel (utmp_buf);
 574           else if (need_boottime && UT_TYPE (utmp_buf) == BOOT_TIME)
 575             print_boottime (utmp_buf);
 576           /* I've never seen one of these, so I don't know what it should
 577              look like :^)
 578              FIXME: handle OLD_TIME also, perhaps show the delta? */
 579           else if (need_clockchange && UT_TYPE (utmp_buf) == NEW_TIME)
 580             print_clockchange (utmp_buf);
 581           else if (need_initspawn && UT_TYPE (utmp_buf) == INIT_PROCESS)
 582             print_initspawn (utmp_buf);
 583           else if (need_login && UT_TYPE (utmp_buf) == LOGIN_PROCESS)
 584             print_login (utmp_buf);
 585           else if (need_deadprocs && UT_TYPE (utmp_buf) == DEAD_PROCESS)
 586             print_deadprocs (utmp_buf);
 587         }
 588
 589       utmp_buf++;
 590     }
 591 }
 592
 593 /* Display a list of who is on the system, according to utmp file filename. */
 594 static void
 595 who (const char *filename)
 596 {
 597   int n_users;
 598   STRUCT_UTMP *utmp_buf;
 599   int fail = read_utmp (filename, &n_users, &utmp_buf);
 600
 601   if (fail)
 602     error (EXIT_FAILURE, errno, "%s", filename);
 603
 604   if (short_list)
 605     list_entries_who (n_users, utmp_buf);
 606   else
 607     scan_entries (n_users, utmp_buf);
 608
 609   free (utmp_buf);
 610 }
 611
 612 void
 613 usage (int status)
 614 {
 615   if (status != EXIT_SUCCESS)
 616     fprintf (stderr, _("Try `%s --help' for more information.\n"),
 617              program_name);
 618   else
 619     {
 620       printf (_("Usage: %s [OPTION]... [ FILE | ARG1 ARG2 ]\n"), program_name);
 621       fputs (_("\
 622 \n\
 623   -a, --all         same as -b -d --login -p -r -t -T -u\n\
 624   -b, --boot        time of last system boot\n\
 625   -d, --dead        print dead processes\n\
 626   -H, --heading     print line of column headings\n\
 627 "), stdout);
 628       fputs (_("\
 629   -i, --idle        add idle time as HOURS:MINUTES, . or old\n\
 630                     (deprecated, use -u)\n\
 631   -l, --login       print system login processes\n\
 632 "), stdout);
 633       fputs (_("\
 634       --lookup      attempt to canonicalize hostnames via DNS\n\
 635   -m                only hostname and user associated with stdin\n\
 636   -p, --process     print active processes spawned by init\n\
 637 "), stdout);
 638       fputs (_("\
 639   -q, --count       all login names and number of users logged on\n\
 640   -r, --runlevel    print current runlevel\n\
 641   -s, --short       print only name, line, and time (default)\n\
 642   -t, --time        print last system clock change\n\
 643 "), stdout);
 644       fputs (_("\
 645   -T, -w, --mesg    add user's message status as +, - or ?\n\
 646   -u, --users       list users logged in\n\
 647       --message     same as -T\n\
 648       --writable    same as -T\n\
 649 "), stdout);
 650       fputs (HELP_OPTION_DESCRIPTION, stdout);
 651       fputs (VERSION_OPTION_DESCRIPTION, stdout);
 652       printf (_("\
 653 \n\
 654 If FILE is not specified, use %s.  %s as FILE is common.\n\
 655 If ARG1 ARG2 given, -m presumed: `am i' or `mom likes' are usual.\n\
 656 "), UTMP_FILE, WTMP_FILE);
 657       printf (_("\nReport bugs to <%s>.\n"), PACKAGE_BUGREPORT);
 658     }
 659   exit (status);
 660 }
 661
 662 int
 663 main (int argc, char **argv)
 664 {
 665   int optc, longind;
 666   int assumptions = 1;
 667
 668   initialize_main (&argc, &argv);
 669   program_name = argv[0];
 670   setlocale (LC_ALL, "");
 671   bindtextdomain (PACKAGE, LOCALEDIR);
 672   textdomain (PACKAGE);
 673
 674   atexit (close_stdout);
 675
 676   while ((optc = getopt_long (argc, argv, "abdilmpqrstuwHT", longopts,
 677                               &longind)) != -1)
 678     {
 679       switch (optc)
 680         {
 681         case 0:
 682           break;
 683
 684         case 'a':
 685           need_boottime = 1;
 686           need_deadprocs = 1;
 687           need_login = 1;
 688           need_initspawn = 1;
 689           need_runlevel = 1;
 690           need_clockchange = 1;
 691           need_users = 1;
 692           include_mesg = 1;
 693           include_idle = 1;
 694           include_exit = 1;
 695           assumptions = 0;
 696           break;
 697
 698         case 'b':
 699           need_boottime = 1;
 700           assumptions = 0;
 701           break;
 702
 703         case 'd':
 704           need_deadprocs = 1;
 705           include_idle = 1;
 706           include_exit = 1;
 707           assumptions = 0;
 708           break;
 709
 710         case 'H':
 711           include_heading = 1;
 712           break;
 713
 714         case 'l':
 715           need_login = 1;
 716           include_idle = 1;
 717           assumptions = 0;
 718           break;
 719
 720         case 'm':
 721           my_line_only = 1;
 722           break;
 723
 724         case 'p':
 725           need_initspawn = 1;
 726           assumptions = 0;
 727           break;
 728
 729         case 'q':
 730           short_list = 1;
 731           break;
 732
 733         case 'r':
 734           need_runlevel = 1;
 735           include_idle = 1;
 736           assumptions = 0;
 737           break;
 738
 739         case 's':
 740           short_output = 1;
 741           break;
 742
 743         case 't':
 744           need_clockchange = 1;
 745           assumptions = 0;
 746           break;
 747
 748         case 'T':
 749         case 'w':
 750           include_mesg = 1;
 751           break;
 752
 753         case 'i':
 754           error (0, 0,
 755                  _("Warning: -i will be removed in a future release; \
 756   use -u instead"));
 757           /* Fall through.  */
 758         case 'u':
 759           need_users = 1;
 760           include_idle = 1;
 761           assumptions = 0;
 762           break;
 763
 764         case LOOKUP_OPTION:
 765           do_lookup = 1;
 766           break;
 767
 768           case_GETOPT_HELP_CHAR;
 769
 770           case_GETOPT_VERSION_CHAR (PROGRAM_NAME, AUTHORS);
 771
 772         default:
 773           usage (EXIT_FAILURE);
 774         }
 775     }
 776
 777   if (assumptions)
 778     {
 779       need_users = 1;
 780       short_output = 1;
 781     }
 782
 783   if (include_exit)
 784     {
 785       short_output = 0;
 786     }
 787
 788   switch (argc - optind)
 789     {
 790     case -1:
 791     case 0:                     /* who */
 792       who (UTMP_FILE);
 793       break;
 794
 795     case 1:                     /* who <utmp file> */
 796       who (argv[optind]);
 797       break;
 798
 799     case 2:                     /* who <blurf> <glop> */
 800       my_line_only = 1;
 801       who (UTMP_FILE);
 802       break;
 803
 804     default:                    /* lose */
 805       error (0, 0, _("too many arguments"));
 806       usage (EXIT_FAILURE);
 807     }
 808
 809   exit (EXIT_SUCCESS);
 810 }