src/who.c

   1 /* GNU's who.
   2    Copyright (C) 1992-2006 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, 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 "canon-host.h"
  35 #include "readutmp.h"
  36 #include "error.h"
  37 #include "hard-locale.h"
  38 #include "inttostr.h"
  39 #include "quote.h"
  40 #include "vasprintf.h"
  41
  42 /* The official name of this program (e.g., no `g' prefix).  */
  43 #define PROGRAM_NAME "who"
  44
  45 #define AUTHORS "Joseph Arceneaux", "David MacKenzie", "Michael Stone"
  46
  47 #ifndef MAXHOSTNAMELEN
  48 # define MAXHOSTNAMELEN 64
  49 #endif
  50
  51 #ifdef RUN_LVL
  52 # define UT_TYPE_RUN_LVL(U) UT_TYPE_EQ (U, RUN_LVL)
  53 #else
  54 # define UT_TYPE_RUN_LVL(U) false
  55 #endif
  56
  57 #ifdef INIT_PROCESS
  58 # define UT_TYPE_INIT_PROCESS(U) UT_TYPE_EQ (U, INIT_PROCESS)
  59 #else
  60 # define UT_TYPE_INIT_PROCESS(U) false
  61 #endif
  62
  63 #ifdef LOGIN_PROCESS
  64 # define UT_TYPE_LOGIN_PROCESS(U) UT_TYPE_EQ (U, LOGIN_PROCESS)
  65 #else
  66 # define UT_TYPE_LOGIN_PROCESS(U) false
  67 #endif
  68
  69 #ifdef DEAD_PROCESS
  70 # define UT_TYPE_DEAD_PROCESS(U) UT_TYPE_EQ (U, DEAD_PROCESS)
  71 #else
  72 # define UT_TYPE_DEAD_PROCESS(U) false
  73 #endif
  74
  75 #ifdef NEW_TIME
  76 # define UT_TYPE_NEW_TIME(U) UT_TYPE_EQ (U, NEW_TIME)
  77 #else
  78 # define UT_TYPE_NEW_TIME(U) false
  79 #endif
  80
  81 #define IDLESTR_LEN 6
  82
  83 #if HAVE_STRUCT_XTMP_UT_PID
  84 # define PIDSTR_DECL_AND_INIT(Var, Utmp_ent) \
  85   char Var[INT_STRLEN_BOUND (Utmp_ent->ut_pid) + 1]; \
  86   sprintf (Var, "%ld", (long int) (Utmp_ent->ut_pid))
  87 #else
  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 # define UT_ID(U) "??"
  96 #endif
  97
  98 char *ttyname ();
  99
 100 /* The name this program was run with. */
 101 char *program_name;
 102
 103 /* If true, attempt to canonicalize hostnames via a DNS lookup. */
 104 static bool do_lookup;
 105
 106 /* If true, display only a list of usernames and count of
 107    the users logged on.
 108    Ignored for `who am i'.  */
 109 static bool short_list;
 110
 111 /* If true, display only name, line, and time fields.  */
 112 static bool short_output;
 113
 114 /* If true, display the hours:minutes since each user has touched
 115    the keyboard, or "." if within the last minute, or "old" if
 116    not within the last day.  */
 117 static bool include_idle;
 118
 119 /* If true, display a line at the top describing each field.  */
 120 static bool include_heading;
 121
 122 /* If true, display a `+' for each user if mesg y, a `-' if mesg n,
 123    or a `?' if their tty cannot be statted. */
 124 static bool include_mesg;
 125
 126 /* If true, display process termination & exit status.  */
 127 static bool include_exit;
 128
 129 /* If true, display the last boot time.  */
 130 static bool need_boottime;
 131
 132 /* If true, display dead processes.  */
 133 static bool need_deadprocs;
 134
 135 /* If true, display processes waiting for user login.  */
 136 static bool need_login;
 137
 138 /* If true, display processes started by init.  */
 139 static bool need_initspawn;
 140
 141 /* If true, display the last clock change.  */
 142 static bool need_clockchange;
 143
 144 /* If true, display the current runlevel.  */
 145 static bool need_runlevel;
 146
 147 /* If true, display user processes.  */
 148 static bool need_users;
 149
 150 /* If true, display info only for the controlling tty.  */
 151 static bool my_line_only;
 152
 153 /* The strftime format to use for login times, and its expected
 154    output width.  */
 155 static char const *time_format;
 156 static int time_format_width;
 157
 158 /* for long options with no corresponding short option, use enum */
 159 enum
 160 {
 161   LOOKUP_OPTION = CHAR_MAX + 1
 162 };
 163
 164 static struct option const longopts[] = {
 165   {"all", no_argument, NULL, 'a'},
 166   {"boot", no_argument, NULL, 'b'},
 167   {"count", no_argument, NULL, 'q'},
 168   {"dead", no_argument, NULL, 'd'},
 169   {"heading", no_argument, NULL, 'H'},
 170   {"idle", no_argument, NULL, 'i'}, /* FIXME: deprecated: remove in late 2006 */
 171   {"login", no_argument, NULL, 'l'},
 172   {"lookup", no_argument, NULL, LOOKUP_OPTION},
 173   {"message", no_argument, NULL, 'T'},
 174   {"mesg", no_argument, NULL, 'T'},
 175   {"process", no_argument, NULL, 'p'},
 176   {"runlevel", no_argument, NULL, 'r'},
 177   {"short", no_argument, NULL, 's'},
 178   {"time", no_argument, NULL, 't'},
 179   {"users", no_argument, NULL, 'u'},
 180   {"writable", no_argument, NULL, 'T'},
 181   {GETOPT_HELP_OPTION_DECL},
 182   {GETOPT_VERSION_OPTION_DECL},
 183   {NULL, 0, NULL, 0}
 184 };
 185
 186 /* Return a string representing the time between WHEN and now.
 187    BOOTTIME is the time of last reboot.
 188    FIXME: locale? */
 189 static const char *
 190 idle_string (time_t when, time_t boottime)
 191 {
 192   static time_t now = TYPE_MINIMUM (time_t);
 193
 194   if (now == TYPE_MINIMUM (time_t))
 195     time (&now);
 196
 197   if (boottime < when && now - 24 * 60 * 60 < when && when <= now)
 198     {
 199       int seconds_idle = now - when;
 200       if (seconds_idle < 60)
 201         return "  .  ";
 202       else
 203         {
 204           static char idle_hhmm[IDLESTR_LEN];
 205           sprintf (idle_hhmm, "%02d:%02d",
 206                    seconds_idle / (60 * 60),
 207                    (seconds_idle % (60 * 60)) / 60);
 208           return idle_hhmm;
 209         }
 210     }
 211
 212   return _(" old ");
 213 }
 214
 215 /* Return a time string.  */
 216 static const char *
 217 time_string (const STRUCT_UTMP *utmp_ent)
 218 {
 219   static char buf[INT_STRLEN_BOUND (intmax_t) + sizeof "-%m-%d %H:%M"];
 220
 221   /* Don't take the address of UT_TIME_MEMBER directly.
 222      Ulrich Drepper wrote:
 223      ``... GNU libc (and perhaps other libcs as well) have extended
 224      utmp file formats which do not use a simple time_t ut_time field.
 225      In glibc, ut_time is a macro which selects for backward compatibility
 226      the tv_sec member of a struct timeval value.''  */
 227   time_t t = UT_TIME_MEMBER (utmp_ent);
 228   struct tm *tmp = localtime (&t);
 229
 230   if (tmp)
 231     {
 232       strftime (buf, sizeof buf, time_format, tmp);
 233       return buf;
 234     }
 235   else
 236     return TYPE_SIGNED (time_t) ? imaxtostr (t, buf) : umaxtostr (t, buf);
 237 }
 238
 239 /* Print formatted output line. Uses mostly arbitrary field sizes, probably
 240    will need tweaking if any of the localization stuff is done, or for 64 bit
 241    pids, etc. */
 242 static void
 243 print_line (int userlen, const char *user, const char state,
 244             int linelen, const char *line,
 245             const char *time_str, const char *idle, const char *pid,
 246             const char *comment, const char *exitstr)
 247 {
 248   static char mesg[3] = { ' ', 'x', '\0' };
 249   char *buf;
 250   char x_idle[1 + IDLESTR_LEN + 1];
 251   char x_pid[1 + INT_STRLEN_BOUND (pid_t) + 1];
 252   char *x_exitstr;
 253   int err;
 254
 255   mesg[1] = state;
 256
 257   if (include_idle && !short_output && strlen (idle) < sizeof x_idle - 1)
 258     sprintf (x_idle, " %-6s", idle);
 259   else
 260     *x_idle = '\0';
 261
 262   if (!short_output && strlen (pid) < sizeof x_pid - 1)
 263     sprintf (x_pid, " %10s", pid);
 264   else
 265     *x_pid = '\0';
 266
 267   x_exitstr = xmalloc (include_exit ? 1 + MAX (12, strlen (exitstr)) + 1 : 1);
 268   if (include_exit)
 269     sprintf (x_exitstr, " %-12s", exitstr);
 270   else
 271     *x_exitstr = '\0';
 272
 273   err = asprintf (&buf,
 274                   "%-8.*s"
 275                   "%s"
 276                   " %-12.*s"
 277                   " %-*s"
 278                   "%s"
 279                   "%s"
 280                   " %-8s"
 281                   "%s"
 282                   ,
 283                   userlen, user ? user : "   .",
 284                   include_mesg ? mesg : "",
 285                   linelen, line,
 286                   time_format_width,
 287                   time_str,
 288                   x_idle,
 289                   x_pid,
 290                   /* FIXME: it's not really clear whether the following
 291                      field should be in the short_output.  A strict reading
 292                      of SUSv2 would suggest not, but I haven't seen any
 293                      implementations that actually work that way... */
 294                   comment,
 295                   x_exitstr
 296                   );
 297   if (err == -1)
 298     xalloc_die ();
 299
 300   {
 301     /* Remove any trailing spaces.  */
 302     char *p = buf + strlen (buf);
 303     while (*--p == ' ')
 304       /* empty */;
 305     *(p + 1) = '\0';
 306   }
 307
 308   puts (buf);
 309   free (buf);
 310   free (x_exitstr);
 311 }
 312
 313 /* Send properly parsed USER_PROCESS info to print_line.  The most
 314    recent boot time is BOOTTIME. */
 315 static void
 316 print_user (const STRUCT_UTMP *utmp_ent, time_t boottime)
 317 {
 318   struct stat stats;
 319   time_t last_change;
 320   char mesg;
 321   char idlestr[IDLESTR_LEN + 1];
 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 file name.  Some systems may put the full,
 333      absolute file name 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, "%.*s", IDLESTR_LEN, idle_string (last_change, boottime));
 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 = NULL;
 368       char *display = NULL;
 369
 370       /* Copy the host name into UT_HOST, and ensure it's nul terminated. */
 371       strncpy (ut_host, utmp_ent->ut_host, sizeof (utmp_ent->ut_host));
 372       ut_host[sizeof (utmp_ent->ut_host)] = '\0';
 373
 374       /* Look for an X display.  */
 375       display = strchr (ut_host, ':');
 376       if (display)
 377         *display++ = '\0';
 378
 379       if (*ut_host && do_lookup)
 380         {
 381           /* See if we can canonicalize it.  */
 382           host = canon_host (ut_host);
 383         }
 384
 385       if (! host)
 386         host = ut_host;
 387
 388       if (display)
 389         {
 390           if (hostlen < strlen (host) + strlen (display) + 4)
 391             {
 392               hostlen = strlen (host) + strlen (display) + 4;
 393               hoststr = xrealloc (hoststr, hostlen);
 394             }
 395           sprintf (hoststr, "(%s:%s)", host, display);
 396         }
 397       else
 398         {
 399           if (hostlen < strlen (host) + 3)
 400             {
 401               hostlen = strlen (host) + 3;
 402               hoststr = xrealloc (hoststr, hostlen);
 403             }
 404           sprintf (hoststr, "(%s)", host);
 405         }
 406
 407       if (host != ut_host)
 408         free (host);
 409     }
 410   else
 411     {
 412       if (hostlen < 1)
 413         {
 414           hostlen = 1;
 415           hoststr = xrealloc (hoststr, hostlen);
 416         }
 417       *hoststr = '\0';
 418     }
 419 #endif
 420
 421   print_line (sizeof UT_USER (utmp_ent), UT_USER (utmp_ent), mesg,
 422               sizeof utmp_ent->ut_line, utmp_ent->ut_line,
 423               time_string (utmp_ent), idlestr, pidstr,
 424               hoststr ? hoststr : "", "");
 425 }
 426
 427 static void
 428 print_boottime (const STRUCT_UTMP *utmp_ent)
 429 {
 430   print_line (-1, "", ' ', -1, "system boot",
 431               time_string (utmp_ent), "", "", "", "");
 432 }
 433
 434 static char *
 435 make_id_equals_comment (STRUCT_UTMP const *utmp_ent)
 436 {
 437   char *comment = xmalloc (strlen (_("id=")) + sizeof UT_ID (utmp_ent) + 1);
 438
 439   strcpy (comment, _("id="));
 440   strncat (comment, UT_ID (utmp_ent), sizeof UT_ID (utmp_ent));
 441   return comment;
 442 }
 443
 444 static void
 445 print_deadprocs (const STRUCT_UTMP *utmp_ent)
 446 {
 447   static char *exitstr;
 448   char *comment = make_id_equals_comment (utmp_ent);
 449   PIDSTR_DECL_AND_INIT (pidstr, utmp_ent);
 450
 451   if (!exitstr)
 452     exitstr = xmalloc (strlen (_("term="))
 453                        + INT_STRLEN_BOUND (UT_EXIT_E_TERMINATION (utmp_ent)) + 1
 454                        + strlen (_("exit="))
 455                        + INT_STRLEN_BOUND (UT_EXIT_E_EXIT (utmp_ent))
 456                        + 1);
 457   sprintf (exitstr, "%s%d %s%d", _("term="), UT_EXIT_E_TERMINATION (utmp_ent),
 458            _("exit="), UT_EXIT_E_EXIT (utmp_ent));
 459
 460   /* FIXME: add idle time? */
 461
 462   print_line (-1, "", ' ', sizeof utmp_ent->ut_line, utmp_ent->ut_line,
 463               time_string (utmp_ent), "", pidstr, comment, exitstr);
 464   free (comment);
 465 }
 466
 467 static void
 468 print_login (const STRUCT_UTMP *utmp_ent)
 469 {
 470   char *comment = make_id_equals_comment (utmp_ent);
 471   PIDSTR_DECL_AND_INIT (pidstr, utmp_ent);
 472
 473   /* FIXME: add idle time? */
 474
 475   print_line (-1, "LOGIN", ' ', sizeof utmp_ent->ut_line, utmp_ent->ut_line,
 476               time_string (utmp_ent), "", pidstr, comment, "");
 477   free (comment);
 478 }
 479
 480 static void
 481 print_initspawn (const STRUCT_UTMP *utmp_ent)
 482 {
 483   char *comment = make_id_equals_comment (utmp_ent);
 484   PIDSTR_DECL_AND_INIT (pidstr, utmp_ent);
 485
 486   print_line (-1, "", ' ', sizeof utmp_ent->ut_line, utmp_ent->ut_line,
 487               time_string (utmp_ent), "", pidstr, comment, "");
 488   free (comment);
 489 }
 490
 491 static void
 492 print_clockchange (const STRUCT_UTMP *utmp_ent)
 493 {
 494   /* FIXME: handle NEW_TIME & OLD_TIME both */
 495   print_line (-1, "", ' ', -1, _("clock change"),
 496               time_string (utmp_ent), "", "", "", "");
 497 }
 498
 499 static void
 500 print_runlevel (const STRUCT_UTMP *utmp_ent)
 501 {
 502   static char *runlevline, *comment;
 503   unsigned char last = UT_PID (utmp_ent) / 256;
 504   unsigned char curr = UT_PID (utmp_ent) % 256;
 505
 506   if (!runlevline)
 507     runlevline = xmalloc (strlen (_("run-level")) + 3);
 508   sprintf (runlevline, "%s %c", _("run-level"), curr);
 509
 510   if (!comment)
 511     comment = xmalloc (strlen (_("last=")) + 2);
 512   sprintf (comment, "%s%c", _("last="), (last == 'N') ? 'S' : last);
 513
 514   print_line (-1, "", ' ', -1, runlevline, time_string (utmp_ent),
 515               "", "", comment, "");
 516
 517   return;
 518 }
 519
 520 /* Print the username of each valid entry and the number of valid entries
 521    in UTMP_BUF, which should have N elements. */
 522 static void
 523 list_entries_who (size_t n, const STRUCT_UTMP *utmp_buf)
 524 {
 525   unsigned long int entries = 0;
 526   char const *separator = "";
 527
 528   while (n--)
 529     {
 530       if (IS_USER_PROCESS (utmp_buf))
 531         {
 532           char *trimmed_name;
 533
 534           trimmed_name = extract_trimmed_name (utmp_buf);
 535
 536           printf ("%s%s", separator, trimmed_name);
 537           free (trimmed_name);
 538           separator = " ";
 539           entries++;
 540         }
 541       utmp_buf++;
 542     }
 543   printf (_("\n# users=%lu\n"), entries);
 544 }
 545
 546 static void
 547 print_heading (void)
 548 {
 549   print_line (-1, _("NAME"), ' ', -1, _("LINE"), _("TIME"), _("IDLE"),
 550               _("PID"), _("COMMENT"), _("EXIT"));
 551 }
 552
 553 /* Display UTMP_BUF, which should have N entries. */
 554 static void
 555 scan_entries (size_t n, const STRUCT_UTMP *utmp_buf)
 556 {
 557   char *ttyname_b IF_LINT ( = NULL);
 558   time_t boottime = TYPE_MINIMUM (time_t);
 559
 560   if (include_heading)
 561     print_heading ();
 562
 563   if (my_line_only)
 564     {
 565       ttyname_b = ttyname (STDIN_FILENO);
 566       if (!ttyname_b)
 567         return;
 568       if (strncmp (ttyname_b, DEV_DIR_WITH_TRAILING_SLASH, DEV_DIR_LEN) == 0)
 569         ttyname_b += DEV_DIR_LEN;       /* Discard /dev/ prefix.  */
 570     }
 571
 572   while (n--)
 573     {
 574       if (!my_line_only ||
 575           strncmp (ttyname_b, utmp_buf->ut_line,
 576                    sizeof (utmp_buf->ut_line)) == 0)
 577         {
 578           if (need_users && IS_USER_PROCESS (utmp_buf))
 579             print_user (utmp_buf, boottime);
 580           else if (need_runlevel && UT_TYPE_RUN_LVL (utmp_buf))
 581             print_runlevel (utmp_buf);
 582           else if (need_boottime && UT_TYPE_BOOT_TIME (utmp_buf))
 583             print_boottime (utmp_buf);
 584           /* I've never seen one of these, so I don't know what it should
 585              look like :^)
 586              FIXME: handle OLD_TIME also, perhaps show the delta? */
 587           else if (need_clockchange && UT_TYPE_NEW_TIME (utmp_buf))
 588             print_clockchange (utmp_buf);
 589           else if (need_initspawn && UT_TYPE_INIT_PROCESS (utmp_buf))
 590             print_initspawn (utmp_buf);
 591           else if (need_login && UT_TYPE_LOGIN_PROCESS (utmp_buf))
 592             print_login (utmp_buf);
 593           else if (need_deadprocs && UT_TYPE_DEAD_PROCESS (utmp_buf))
 594             print_deadprocs (utmp_buf);
 595         }
 596
 597       if (UT_TYPE_BOOT_TIME (utmp_buf))
 598         boottime = UT_TIME_MEMBER (utmp_buf);
 599
 600       utmp_buf++;
 601     }
 602 }
 603
 604 /* Display a list of who is on the system, according to utmp file FILENAME.
 605    Use read_utmp OPTIONS to read the file.  */
 606 static void
 607 who (const char *filename, int options)
 608 {
 609   size_t n_users;
 610   STRUCT_UTMP *utmp_buf;
 611
 612   if (read_utmp (filename, &n_users, &utmp_buf, options) != 0)
 613     error (EXIT_FAILURE, errno, "%s", filename);
 614
 615   if (short_list)
 616     list_entries_who (n_users, utmp_buf);
 617   else
 618     scan_entries (n_users, utmp_buf);
 619
 620   free (utmp_buf);
 621 }
 622
 623 void
 624 usage (int status)
 625 {
 626   if (status != EXIT_SUCCESS)
 627     fprintf (stderr, _("Try `%s --help' for more information.\n"),
 628              program_name);
 629   else
 630     {
 631       printf (_("Usage: %s [OPTION]... [ FILE | ARG1 ARG2 ]\n"), program_name);
 632       fputs (_("\
 633 \n\
 634   -a, --all         same as -b -d --login -p -r -t -T -u\n\
 635   -b, --boot        time of last system boot\n\
 636   -d, --dead        print dead processes\n\
 637   -H, --heading     print line of column headings\n\
 638 "), stdout);
 639       fputs (_("\
 640   -l, --login       print system login processes\n\
 641 "), stdout);
 642       fputs (_("\
 643       --lookup      attempt to canonicalize hostnames via DNS\n\
 644   -m                only hostname and user associated with stdin\n\
 645   -p, --process     print active processes spawned by init\n\
 646 "), stdout);
 647       fputs (_("\
 648   -q, --count       all login names and number of users logged on\n\
 649   -r, --runlevel    print current runlevel\n\
 650   -s, --short       print only name, line, and time (default)\n\
 651   -t, --time        print last system clock change\n\
 652 "), stdout);
 653       fputs (_("\
 654   -T, -w, --mesg    add user's message status as +, - or ?\n\
 655   -u, --users       list users logged in\n\
 656       --message     same as -T\n\
 657       --writable    same as -T\n\
 658 "), stdout);
 659       fputs (HELP_OPTION_DESCRIPTION, stdout);
 660       fputs (VERSION_OPTION_DESCRIPTION, stdout);
 661       printf (_("\
 662 \n\
 663 If FILE is not specified, use %s.  %s as FILE is common.\n\
 664 If ARG1 ARG2 given, -m presumed: `am i' or `mom likes' are usual.\n\
 665 "), UTMP_FILE, WTMP_FILE);
 666       printf (_("\nReport bugs to <%s>.\n"), PACKAGE_BUGREPORT);
 667     }
 668   exit (status);
 669 }
 670
 671 int
 672 main (int argc, char **argv)
 673 {
 674   int optc;
 675   bool assumptions = true;
 676
 677   initialize_main (&argc, &argv);
 678   program_name = argv[0];
 679   setlocale (LC_ALL, "");
 680   bindtextdomain (PACKAGE, LOCALEDIR);
 681   textdomain (PACKAGE);
 682
 683   atexit (close_stdout);
 684
 685   while ((optc = getopt_long (argc, argv, "abdilmpqrstuwHT", longopts, NULL))
 686          != -1)
 687     {
 688       switch (optc)
 689         {
 690         case 'a':
 691           need_boottime = true;
 692           need_deadprocs = true;
 693           need_login = true;
 694           need_initspawn = true;
 695           need_runlevel = true;
 696           need_clockchange = true;
 697           need_users = true;
 698           include_mesg = true;
 699           include_idle = true;
 700           include_exit = true;
 701           assumptions = false;
 702           break;
 703
 704         case 'b':
 705           need_boottime = true;
 706           assumptions = false;
 707           break;
 708
 709         case 'd':
 710           need_deadprocs = true;
 711           include_idle = true;
 712           include_exit = true;
 713           assumptions = false;
 714           break;
 715
 716         case 'H':
 717           include_heading = true;
 718           break;
 719
 720         case 'l':
 721           need_login = true;
 722           include_idle = true;
 723           assumptions = false;
 724           break;
 725
 726         case 'm':
 727           my_line_only = true;
 728           break;
 729
 730         case 'p':
 731           need_initspawn = true;
 732           assumptions = false;
 733           break;
 734
 735         case 'q':
 736           short_list = true;
 737           break;
 738
 739         case 'r':
 740           need_runlevel = true;
 741           include_idle = true;
 742           assumptions = false;
 743           break;
 744
 745         case 's':
 746           short_output = true;
 747           break;
 748
 749         case 't':
 750           need_clockchange = true;
 751           assumptions = false;
 752           break;
 753
 754         case 'T':
 755         case 'w':
 756           include_mesg = true;
 757           break;
 758
 759         case 'i':
 760           error (0, 0,
 761                  _("Warning: -i will be removed in a future release; \
 762   use -u instead"));
 763           /* Fall through.  */
 764         case 'u':
 765           need_users = true;
 766           include_idle = true;
 767           assumptions = false;
 768           break;
 769
 770         case LOOKUP_OPTION:
 771           do_lookup = true;
 772           break;
 773
 774           case_GETOPT_HELP_CHAR;
 775
 776           case_GETOPT_VERSION_CHAR (PROGRAM_NAME, AUTHORS);
 777
 778         default:
 779           usage (EXIT_FAILURE);
 780         }
 781     }
 782
 783   if (assumptions)
 784     {
 785       need_users = true;
 786       short_output = true;
 787     }
 788
 789   if (include_exit)
 790     {
 791       short_output = false;
 792     }
 793
 794   if (hard_locale (LC_TIME))
 795     {
 796       time_format = "%Y-%m-%d %H:%M";
 797       time_format_width = 4 + 1 + 2 + 1 + 2 + 1 + 2 + 1 + 2;
 798     }
 799   else
 800     {
 801       time_format = "%b %e %H:%M";
 802       time_format_width = 3 + 1 + 2 + 1 + 2 + 1 + 2;
 803     }
 804
 805   switch (argc - optind)
 806     {
 807     case 2:                     /* who <blurf> <glop> */
 808       my_line_only = true;
 809       /* Fall through.  */
 810     case -1:
 811     case 0:                     /* who */
 812       who (UTMP_FILE, READ_UTMP_CHECK_PIDS);
 813       break;
 814
 815     case 1:                     /* who <utmp file> */
 816       who (argv[optind], 0);
 817       break;
 818
 819     default:                    /* lose */
 820       error (0, 0, _("extra operand %s"), quote (argv[optind + 2]));
 821       usage (EXIT_FAILURE);
 822     }
 823
 824   exit (EXIT_SUCCESS);
 825 }