1 | /* vi: set sw=4 ts=4: */
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2 | /*----------------------------------------------------------------------
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3 | * Mini who is used to display user name, login time,
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4 | * idle time and host name.
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5 | *
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6 | * Author: Da Chen <dchen@ayrnetworks.com>
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7 | *
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8 | * This is a free document; you can redistribute it and/or
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9 | * modify it under the terms of the GNU General Public License
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10 | * as published by the Free Software Foundation:
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11 | * http://www.gnu.org/copyleft/gpl.html
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12 | *
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13 | * Copyright (c) 2002 AYR Networks, Inc.
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14 | *----------------------------------------------------------------------
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15 | */
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16 |
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17 | #include "busybox.h"
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18 | #include <utmp.h>
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19 | #include <time.h>
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20 |
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21 | static const char * idle_string (time_t t)
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22 | {
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23 | static char str[6];
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24 |
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25 | time_t s = time(NULL) - t;
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26 |
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27 | if (s < 60)
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28 | return ".";
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29 | if (s < (24 * 60 * 60)) {
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30 | sprintf (str, "%02d:%02d",
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31 | (int) (s / (60 * 60)),
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32 | (int) ((s % (60 * 60)) / 60));
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33 | return str;
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34 | }
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35 | return "old";
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36 | }
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37 |
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38 | int who_main(int argc, char **argv)
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39 | {
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40 | struct utmp *ut;
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41 | struct stat st;
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42 | char *name;
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43 |
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44 | if (argc > 1) {
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45 | bb_show_usage();
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46 | }
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47 |
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48 | setutent();
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49 | printf("USER TTY IDLE TIME HOST\n");
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50 | while ((ut = getutent()) != NULL) {
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51 | if (ut->ut_user[0] && ut->ut_type == USER_PROCESS) {
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52 | time_t thyme = ut->ut_tv.tv_sec;
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53 |
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54 | /* ut->ut_line is device name of tty - "/dev/" */
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55 | name = concat_path_file("/dev", ut->ut_line);
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56 | printf("%-10s %-8s %-8s %-12.12s %s\n", ut->ut_user, ut->ut_line,
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57 | (stat(name, &st)) ? "?" : idle_string(st.st_atime),
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58 | ctime(&thyme) + 4, ut->ut_host);
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59 | if (ENABLE_FEATURE_CLEAN_UP) free(name);
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60 | }
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61 | }
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62 | if (ENABLE_FEATURE_CLEAN_UP) endutent();
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63 | return 0;
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64 | }
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