1/* vi: set sw=4 ts=4: */
2/*----------------------------------------------------------------------
3 * Mini who is used to display user name, login time,
4 * idle time and host name.
5 *
6 * Author: Da Chen  <dchen@ayrnetworks.com>
7 *
8 * This is a free document; you can redistribute it and/or
9 * modify it under the terms of the GNU General Public License
10 * as published by the Free Software Foundation:
11 *    http://www.gnu.org/copyleft/gpl.html
12 *
13 * Copyright (c) 2002 AYR Networks, Inc.
14 *
15 * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
16 *
17 *----------------------------------------------------------------------
18 */
19
20#include "libbb.h"
21#include <utmp.h>
22#include <time.h>
23
24static void idle_string(char *str6, time_t t)
25{
26	t = time(NULL) - t;
27
28	/*if (t < 60) {
29		str6[0] = '.';
30		str6[1] = '\0';
31		return;
32	}*/
33	if (t >= 0 && t < (24 * 60 * 60)) {
34		sprintf(str6, "%02d:%02d",
35				(int) (t / (60 * 60)),
36				(int) ((t % (60 * 60)) / 60));
37		return;
38	}
39	strcpy(str6, "old");
40}
41
42int who_main(int argc, char **argv);
43int who_main(int argc, char **argv)
44{
45	char str6[6];
46	struct utmp *ut;
47	struct stat st;
48	char *name;
49
50	if (argc > 1) {
51		bb_show_usage();
52	}
53
54	setutent();
55	printf("USER       TTY      IDLE      TIME           HOST\n");
56	while ((ut = getutent()) != NULL) {
57		if (ut->ut_user[0] && ut->ut_type == USER_PROCESS) {
58			time_t thyme = ut->ut_tv.tv_sec;
59
60			/* ut->ut_line is device name of tty - "/dev/" */
61			name = concat_path_file("/dev", ut->ut_line);
62			str6[0] = '?';
63			str6[1] = '\0';
64			if (stat(name, &st) == 0)
65				idle_string(str6, st.st_atime);
66			printf("%-10s %-8s %-9s %-14.14s %s\n",
67					ut->ut_user, ut->ut_line, str6,
68					ctime(&thyme) + 4, ut->ut_host);
69			if (ENABLE_FEATURE_CLEAN_UP)
70				free(name);
71		}
72	}
73	if (ENABLE_FEATURE_CLEAN_UP)
74		endutent();
75	return 0;
76}
77