source: MondoRescue/branches/3.2/mindi-busybox/procps/uptime.c

/* vi: set sw=4 ts=4: */
/*
 * Mini uptime implementation for busybox
 *
 * Copyright (C) 1999-2004 by Erik Andersen <andersen@codepoet.org>
 *
 * Licensed under GPLv2, see file LICENSE in this source tree.
 */

/* 2011     Pere Orga <gotrunks@gmail.com>
 *
 * Added FEATURE_UPTIME_UTMP_SUPPORT flag.
 */

/* getopt not needed */

//config:config UPTIME
//config:   bool "uptime"
//config:   default y
//config:   select PLATFORM_LINUX #sysinfo()
//config:   help
//config:     uptime gives a one line display of the current time, how long
//config:     the system has been running, how many users are currently logged
//config:     on, and the system load averages for the past 1, 5, and 15 minutes.
//config:
//config:config FEATURE_UPTIME_UTMP_SUPPORT
//config:   bool "Support for showing the number of users"
//config:   default y
//config:   depends on UPTIME && FEATURE_UTMP
//config:   help
//config:     Makes uptime display the number of users currently logged on.

//usage:#define uptime_trivial_usage
//usage:       ""
//usage:#define uptime_full_usage "\n\n"
//usage:       "Display the time since the last boot"
//usage:
//usage:#define uptime_example_usage
//usage:       "$ uptime\n"
//usage:       "  1:55pm  up  2:30, load average: 0.09, 0.04, 0.00\n"

#include "libbb.h"
#ifdef __linux__
# include <sys/sysinfo.h>
#endif


#ifndef FSHIFT
# define FSHIFT 16              /* nr of bits of precision */
#endif
#define FIXED_1      (1 << FSHIFT)     /* 1.0 as fixed-point */
#define LOAD_INT(x)  (unsigned)((x) >> FSHIFT)
#define LOAD_FRAC(x) LOAD_INT(((x) & (FIXED_1 - 1)) * 100)


int uptime_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
int uptime_main(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
{
    unsigned updays, uphours, upminutes;
    struct sysinfo info;
    struct tm *current_time;
    time_t current_secs;

    time(&current_secs);
    current_time = localtime(&current_secs);

    sysinfo(&info);

    printf(" %02u:%02u:%02u up ",
            current_time->tm_hour, current_time->tm_min, current_time->tm_sec);
    updays = (unsigned) info.uptime / (unsigned)(60*60*24);
    if (updays)
        printf("%u day%s, ", updays, (updays != 1) ? "s" : "");
    upminutes = (unsigned) info.uptime / (unsigned)60;
    uphours = (upminutes / (unsigned)60) % (unsigned)24;
    upminutes %= 60;
    if (uphours)
        printf("%2u:%02u", uphours, upminutes);
    else
        printf("%u min", upminutes);

#if ENABLE_FEATURE_UPTIME_UTMP_SUPPORT
    {
        struct utmp *ut;
        unsigned users = 0;
        while ((ut = getutent()) != NULL) {
            if ((ut->ut_type == USER_PROCESS) && (ut->ut_name[0] != '\0'))
                users++;
        }
        printf(",  %u users", users);
    }
#endif

    printf(",  load average: %u.%02u, %u.%02u, %u.%02u\n",
            LOAD_INT(info.loads[0]), LOAD_FRAC(info.loads[0]),
            LOAD_INT(info.loads[1]), LOAD_FRAC(info.loads[1]),
            LOAD_INT(info.loads[2]), LOAD_FRAC(info.loads[2]));

    return EXIT_SUCCESS;
}