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.
 *
 *----------------------------------------------------------------------
 */

#include "busybox.h"
#include <utmp.h>
#include <time.h>

static const char * idle_string (time_t t)
{
	static char str[6];

	time_t s = time(NULL) - t;

	if (s < 60)
		return ".";
	if (s < (24 * 60 * 60)) {
		sprintf(str, "%02d:%02d",
				(int) (s / (60 * 60)),
				(int) ((s % (60 * 60)) / 60));
		return str;
	}
	return "old";
}

int who_main(int argc, char **argv)
{
	struct utmp *ut;
	struct stat st;
	char *name;

	if (argc > 1) {
		bb_show_usage();
	}

	setutent();
	printf("USER       TTY      IDLE      TIME           HOST\n");
	while ((ut = getutent()) != NULL) {
		if (ut->ut_user[0] && ut->ut_type == USER_PROCESS) {
			time_t thyme = ut->ut_tv.tv_sec;

			/* ut->ut_line is device name of tty - "/dev/" */
			name = concat_path_file("/dev", ut->ut_line);
			printf("%-10s %-8s %-8s  %-12.12s   %s\n", ut->ut_user, ut->ut_line,
									(stat(name, &st)) ?  "?" : idle_string(st.st_atime),
									ctime(&thyme) + 4, ut->ut_host);
			if (ENABLE_FEATURE_CLEAN_UP) free(name);
		}
	}
	if (ENABLE_FEATURE_CLEAN_UP) endutent();
	return 0;
}
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 "busybox.h"
21	#include <utmp.h>
22	#include <time.h>
23
24	static const char * idle_string (time_t t)
25	{
26	static char str[6];
27
28	time_t s = time(NULL) - t;
29
30	if (s < 60)
31	return ".";
32	if (s < (24 * 60 * 60)) {
33	sprintf(str, "%02d:%02d",
34	(int) (s / (60 * 60)),
35	(int) ((s % (60 * 60)) / 60));
36	return str;
37	}
38	return "old";
39	}
40
41	int who_main(int argc, char **argv)
42	{
43	struct utmp *ut;
44	struct stat st;
45	char *name;
46
47	if (argc > 1) {
48	bb_show_usage();
49	}
50
51	setutent();
52	printf("USER TTY IDLE TIME HOST\n");
53	while ((ut = getutent()) != NULL) {
54	if (ut->ut_user[0] && ut->ut_type == USER_PROCESS) {
55	time_t thyme = ut->ut_tv.tv_sec;
56
57	/* ut->ut_line is device name of tty - "/dev/" */
58	name = concat_path_file("/dev", ut->ut_line);
59	printf("%-10s %-8s %-8s %-12.12s %s\n", ut->ut_user, ut->ut_line,
60	(stat(name, &st)) ? "?" : idle_string(st.st_atime),
61	ctime(&thyme) + 4, ut->ut_host);
62	if (ENABLE_FEATURE_CLEAN_UP) free(name);
63	}
64	}
65	if (ENABLE_FEATURE_CLEAN_UP) endutent();
66	return 0;
67	}