source: MondoRescue/branches/2.2.5/mindi-busybox/coreutils/who.c@ 1765

/* 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 "libbb.h"
#include <utmp.h>
#include <time.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);
int who_main(int argc, char **argv)
{
    char str6[6];
    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);
            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);
        }
    }
    if (ENABLE_FEATURE_CLEAN_UP)
        endutent();
    return 0;
}