busybox/coreutils/who.c

/* vi: set sw=4 ts=4: */
/*----------------------------------------------------------------------
 * Mini who is used to display user name, login time,
 * idle time and host name.
 *
 * Author: Da Chen  <dchen@ayrnetworks.com>
 *
 * This is a free document; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation:
 *    http://www.gnu.org/copyleft/gpl.html
 *
 * Copyright (c) 2002 AYR Networks, Inc.
 *
 * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
 *
 *----------------------------------------------------------------------
 */
/* BB_AUDIT SUSv3 _NOT_ compliant -- missing options -b, -d, -l, -m, -p, -q, -r, -s, -t, -T, -u; Missing argument 'file'.  */

#include "libbb.h"
#include <utmp.h>

static void idle_string(char *str6, time_t t)
{
	t = time(NULL) - t;

	/*if (t < 60) {
		str6[0] = '.';
		str6[1] = '\0';
		return;
	}*/
	if (t >= 0 && t < (24 * 60 * 60)) {
		sprintf(str6, "%02d:%02d",
				(int) (t / (60 * 60)),
				(int) ((t % (60 * 60)) / 60));
		return;
	}
	strcpy(str6, "old");
}

int who_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
int who_main(int argc UNUSED_PARAM, char **argv)
{
	struct utmp *ut;
	unsigned opt;

	opt_complementary = "=0";
	opt = getopt32(argv, "aH");
	if (opt & 2) // -H
		printf("USER\t\tTTY\t\tIDLE\tTIME\t\t HOST\n");

	setutent();
	while ((ut = getutent()) != NULL) {
		if (ut->ut_user[0]
		 && ((opt & 1) || ut->ut_type == USER_PROCESS)
		) {
			char str6[6];
			char name[sizeof("/dev/") + sizeof(ut->ut_line) + 1];
			struct stat st;
			time_t seconds;

			str6[0] = '?';
			str6[1] = '\0';
			strcpy(name, "/dev/");
			safe_strncpy(ut->ut_line[0] == '/' ? name : name + sizeof("/dev/")-1,
				ut->ut_line,
				sizeof(ut->ut_line)+1
			);
			if (stat(name, &st) == 0)
				idle_string(str6, st.st_atime);
			/* manpages say ut_tv.tv_sec *is* time_t,
			 * but some systems have it wrong */
			seconds = ut->ut_tv.tv_sec;
			/* How wide time field can be?
			 * "Nov 10 19:33:20": 15 chars
			 * "2010-11-10 19:33": 16 chars
			 */
			printf("%-15.*s %-15.*s %-7s %-16.16s %.*s\n",
					(int)sizeof(ut->ut_user), ut->ut_user,
					(int)sizeof(ut->ut_line), ut->ut_line,
					str6,
					ctime(&seconds) + 4,
					(int)sizeof(ut->ut_host), ut->ut_host
			);
		}
	}
	if (ENABLE_FEATURE_CLEAN_UP)
		endutent();
	return EXIT_SUCCESS;
}
1	niro	532	/* 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	niro	1123	/* BB_AUDIT SUSv3 _NOT_ compliant -- missing options -b, -d, -l, -m, -p, -q, -r, -s, -t, -T, -u; Missing argument 'file'. */
20	niro	532
21	niro	816	#include "libbb.h"
22	niro	532	#include <utmp.h>
23
24	niro	816	static void idle_string(char *str6, time_t t)
25	niro	532	{
26	niro	816	t = time(NULL) - t;
27	niro	532
28	niro	816	/*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	niro	532	}
39	niro	816	strcpy(str6, "old");
40	niro	532	}
41
42	niro	816	int who_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
43			int who_main(int argc UNUSED_PARAM, char **argv)
44	niro	532	{
45			struct utmp *ut;
46	niro	816	unsigned opt;
47	niro	532
48	niro	816	opt_complementary = "=0";
49	niro	1123	opt = getopt32(argv, "aH");
50			if (opt & 2) // -H
51			printf("USER\t\tTTY\t\tIDLE\tTIME\t\t HOST\n");
52	niro	532
53			setutent();
54			while ((ut = getutent()) != NULL) {
55	niro	1123	if (ut->ut_user[0]
56			&& ((opt & 1) \|\| ut->ut_type == USER_PROCESS)
57			) {
58			char str6[6];
59			char name[sizeof("/dev/") + sizeof(ut->ut_line) + 1];
60			struct stat st;
61			time_t seconds;
62
63	niro	816	str6[0] = '?';
64			str6[1] = '\0';
65	niro	1123	strcpy(name, "/dev/");
66			safe_strncpy(ut->ut_line[0] == '/' ? name : name + sizeof("/dev/")-1,
67			ut->ut_line,
68			sizeof(ut->ut_line)+1
69			);
70	niro	816	if (stat(name, &st) == 0)
71			idle_string(str6, st.st_atime);
72			/* manpages say ut_tv.tv_sec is time_t,
73			* but some systems have it wrong */
74	niro	1123	seconds = ut->ut_tv.tv_sec;
75			/* How wide time field can be?
76			* "Nov 10 19:33:20": 15 chars
77			* "2010-11-10 19:33": 16 chars
78			*/
79			printf("%-15.s %-15.s %-7s %-16.16s %.*s\n",
80			(int)sizeof(ut->ut_user), ut->ut_user,
81			(int)sizeof(ut->ut_line), ut->ut_line,
82			str6,
83			ctime(&seconds) + 4,
84			(int)sizeof(ut->ut_host), ut->ut_host
85			);
86	niro	532	}
87			}
88	niro	816	if (ENABLE_FEATURE_CLEAN_UP)
89			endutent();
90			return EXIT_SUCCESS;
91	niro	532	}