hush/coreutils/who.c

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/* 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 void idle_string(char *str6, time_t t)
{
t = time(NULL) - t;
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/*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;
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}
strcpy(str6, "old");
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}
int who_main(int argc, char **argv);
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int who_main(int argc, char **argv)
{
char str6[6];
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struct utmp *ut;
struct stat st;
char *name;
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if (argc > 1) {
bb_show_usage();
}
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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;
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/* ut->ut_line is device name of tty - "/dev/" */
name = concat_path_file("/dev", ut->ut_line);
str6[0] = '?';
str6[1] = '\0';
if (stat(name, &st) == 0)
idle_string(str6, st.st_atime);
printf("%-10s %-8s %-9s %-14.14s %s\n",
ut->ut_user, ut->ut_line, str6,
ctime(&thyme) + 4, ut->ut_host);
if (ENABLE_FEATURE_CLEAN_UP)
free(name);
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}
}
if (ENABLE_FEATURE_CLEAN_UP)
endutent();
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return 0;
}