2 Copyright (C) 1992 Free Software Foundation, Inc.
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)
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.
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
16 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
18 /* Written by jla; revised by djm */
21 name [state] line time [idle] host
23 name, line, time: not -q
27 -m Same as 'who am i', for POSIX.
28 -q Only user names and # logged on; overrides all other options.
29 -s Name, line, time (default).
30 -i, -u Idle hours and minutes; '.' means active in last minute;
31 'old' means idle for >24 hours.
32 -H Print column headings at top.
33 -w, -T -s plus mesg (+ or -, or ? if bad line). */
36 #if defined (CONFIG_BROKETS)
37 /* We use <config.h> instead of "config.h" so that a compilation
38 using -I. -I$srcdir will use ./config.h rather than $srcdir/config.h
39 (which it would do because it found this file in $srcdir). */
47 #include <sys/types.h>
52 #include <sys/param.h>
59 #ifdef _PATH_UTMP /* 4.4BSD. */
60 #define UTMP_FILE _PATH_UTMP
61 #else /* !_PATH_UTMP */
62 #define UTMP_FILE "/etc/utmp"
63 #endif /* !_PATH_UTMP */
64 #endif /* !UTMP_FILE */
66 #ifndef MAXHOSTNAMELEN
67 #define MAXHOSTNAMELEN 64
70 #define MESG_BIT 020 /* Group write bit. */
77 static int read_utmp ();
78 static char *idle_string ();
79 static struct utmp *search_entries ();
80 static void list_entries ();
81 static void print_entry ();
82 static void print_heading ();
83 static void scan_entries ();
86 static void who_am_i ();
88 /* The name this program was run with. */
91 /* If non-zero, display usage information and exit. */
94 /* If non-zero, print the version on standard output and exit. */
95 static int show_version;
97 /* If nonzero, display only a list of usernames and count of
99 Ignored for `who am i'. */
100 static int short_list;
102 /* If nonzero, display the hours:minutes since each user has touched
103 the keyboard, or "." if within the last minute, or "old" if
104 not within the last day. */
105 static int include_idle;
107 /* If nonzero, display a line at the top describing each field. */
108 static int include_heading;
110 /* If nonzero, display a `+' for each user if mesg y, a `-' if mesg n,
111 or a `?' if their tty cannot be statted. */
112 static int include_mesg;
114 static struct option const longopts[] =
116 {"count", no_argument, NULL, 'q'},
117 {"help", no_argument, &show_help, 1},
118 {"idle", no_argument, NULL, 'u'},
119 {"heading", no_argument, NULL, 'H'},
120 {"message", no_argument, NULL, 'T'},
121 {"mesg", no_argument, NULL, 'T'},
122 {"version", no_argument, &show_version, 1},
123 {"writable", no_argument, NULL, 'T'},
133 int my_line_only = 0;
135 program_name = argv[0];
137 while ((optc = getopt_long (argc, argv, "imqsuwHT", longopts, &longind))
177 printf ("%s\n", version_string);
185 error (1, errno, "cannot change directory to /dev");
187 switch (argc - optind)
191 who_am_i (UTMP_FILE);
196 case 1: /* who <utmp file> */
198 who_am_i (argv[optind]);
203 case 2: /* who <blurf> <glop> */
204 who_am_i (UTMP_FILE);
214 static struct utmp *utmp_contents;
216 /* Display a list of who is on the system, according to utmp file FILENAME. */
224 users = read_utmp (filename);
226 list_entries (users);
228 scan_entries (users);
231 /* Read the utmp file FILENAME into UTMP_CONTENTS and return the
232 number of entries it contains. */
239 struct stat file_stats;
241 desc = open (filename, O_RDONLY, 0);
243 error (1, errno, "%s", filename);
245 fstat (desc, &file_stats);
246 if (file_stats.st_size > 0)
247 utmp_contents = (struct utmp *) xmalloc ((unsigned) file_stats.st_size);
254 /* Use < instead of != in case the utmp just grew. */
255 if (read (desc, utmp_contents, file_stats.st_size) < file_stats.st_size)
256 error (1, errno, "%s", filename);
258 if (close (desc) != 0)
259 error (1, errno, "%s", filename);
261 return file_stats.st_size / sizeof (struct utmp);
264 /* Display a line of information about entry THIS. */
273 char line[sizeof (this->ut_line) + 1];
275 strncpy (line, this->ut_line, sizeof (this->ut_line));
276 line[sizeof (this->ut_line)] = 0;
277 if (stat (line, &stats) == 0)
279 mesg = (stats.st_mode & MESG_BIT) ? '+' : '-';
280 last_change = stats.st_atime;
289 (int) sizeof (this->ut_name), (int) sizeof (this->ut_name),
292 printf (" %c ", mesg);
294 (int) sizeof (this->ut_line), (int) sizeof (this->ut_line),
296 printf (" %-12.12s", ctime (&this->ut_time) + 4);
300 printf (" %s", idle_string (last_change));
305 if (this->ut_host[0])
306 printf (" (%-.*s)", (int) sizeof (this->ut_host), this->ut_host);
312 /* Print the username of each valid entry and the number of valid entries
313 in `utmp_contents', which should have N elements. */
319 register struct utmp *this = utmp_contents;
320 register int entries = 0;
326 && this->ut_type == USER_PROCESS
330 printf ("%s ", this->ut_name);
335 printf ("\n# users=%u\n", entries);
343 printf ("%-*s ", (int) sizeof (ut->ut_name), "USER");
346 printf ("%-*s ", (int) sizeof (ut->ut_line), "LINE");
347 printf ("LOGIN-TIME ");
353 /* Display `utmp_contents', which should have N entries. */
359 register struct utmp *this = utmp_contents;
368 && this->ut_type == USER_PROCESS
376 /* Search `utmp_contents', which should have N entries, for
377 an entry with a `ut_line' field identical to LINE.
378 Return the first matching entry found, or NULL if there
379 is no matching entry. */
382 search_entries (n, line)
386 register struct utmp *this = utmp_contents;
392 && this->ut_type == USER_PROCESS
394 && !strncmp (line, this->ut_line, sizeof (this->ut_line)))
401 /* Display the entry in utmp file FILENAME for this tty on standard input,
402 or nothing if there is no entry for it. */
408 register struct utmp *utmp_entry;
409 char hostname[MAXHOSTNAMELEN + 1];
412 if (gethostname (hostname, MAXHOSTNAMELEN + 1))
417 printf ("%*s ", (int) strlen (hostname), " ");
424 tty += 5; /* Remove "/dev/". */
426 utmp_entry = search_entries (read_utmp (filename), tty);
427 if (utmp_entry == NULL)
430 printf ("%s!", hostname);
431 print_entry (utmp_entry);
434 /* Return a string representing the time between WHEN and the time
435 that this function is first run. */
441 static time_t now = 0;
442 static char idle[10];
448 seconds_idle = now - when;
449 if (seconds_idle < 60) /* One minute. */
451 if (seconds_idle < (24 * 60 * 60)) /* One day. */
453 sprintf (idle, "%02d:%02d",
454 (int) (seconds_idle / (60 * 60)),
455 (int) ((seconds_idle % (60 * 60)) / 60));
465 fprintf (status == 0 ? stdout : stderr, "\
466 Usage: %s [OPTION]... [ FILE | ARG1 ARG2 ]\n\
471 fprintf (stderr, "Try `%s --help' for more information.\n",
477 -H, --heading print line of column headings\n\
478 -T, -w, --mesg add user's message status as +, - or ?\n\
479 -i, -u, --idle add user idle time as HOURS:MINUTES, . or old\n\
480 -m only hostname and user associated with stdin\n\
481 -q, --count all login names and number of users logged on\n\
483 --help display this help and exit\n\
484 --message same as -T\n\
485 --version output version information and exit\n\
486 --writeable same as -T\n\
488 If FILE not given, uses /etc/utmp. /etc/wtmp as FILE is common.\n\
489 If ARG1 ARG2 given, -m presumed: `am i' or `mom likes' are usual.\n\