procps/uptime.c

   1 /* vi: set sw=4 ts=4: */
   2 /*
   3  * Mini uptime implementation for busybox
   4  *
   5  * Copyright (C) 1999-2004 by Erik Andersen <andersen@codepoet.org>
   6  *
   7  * Licensed under GPLv2, see file LICENSE in this source tree.
   8  */
   9
  10 /* 2011         Pere Orga <gotrunks@gmail.com>
  11  *
  12  * Added FEATURE_UPTIME_UTMP_SUPPORT flag.
  13  */
  14
  15 /* getopt not needed */
  16
  17 //config:config UPTIME
  18 //config:       bool "uptime"
  19 //config:       default y
  20 //config:       select PLATFORM_LINUX #sysinfo()
  21 //config:       help
  22 //config:         uptime gives a one line display of the current time, how long
  23 //config:         the system has been running, how many users are currently logged
  24 //config:         on, and the system load averages for the past 1, 5, and 15 minutes.
  25 //config:
  26 //config:config FEATURE_UPTIME_UTMP_SUPPORT
  27 //config:       bool "Support for showing the number of users"
  28 //config:       default y
  29 //config:       depends on UPTIME && FEATURE_UTMP
  30 //config:       help
  31 //config:         Makes uptime display the number of users currently logged on.
  32
  33 //usage:#define uptime_trivial_usage
  34 //usage:       ""
  35 //usage:#define uptime_full_usage "\n\n"
  36 //usage:       "Display the time since the last boot"
  37 //usage:
  38 //usage:#define uptime_example_usage
  39 //usage:       "$ uptime\n"
  40 //usage:       "  1:55pm  up  2:30, load average: 0.09, 0.04, 0.00\n"
  41
  42 #include "libbb.h"
  43 #ifdef __linux__
  44 # include <sys/sysinfo.h>
  45 #endif
  46
  47
  48 #ifndef FSHIFT
  49 # define FSHIFT 16              /* nr of bits of precision */
  50 #endif
  51 #define FIXED_1      (1 << FSHIFT)     /* 1.0 as fixed-point */
  52 #define LOAD_INT(x)  (unsigned)((x) >> FSHIFT)
  53 #define LOAD_FRAC(x) LOAD_INT(((x) & (FIXED_1 - 1)) * 100)
  54
  55
  56 int uptime_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
  57 int uptime_main(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
  58 {
  59         unsigned updays, uphours, upminutes;
  60         struct sysinfo info;
  61         struct tm *current_time;
  62         time_t current_secs;
  63
  64         time(&current_secs);
  65         current_time = localtime(&current_secs);
  66
  67         sysinfo(&info);
  68
  69         printf(" %02u:%02u:%02u up ",
  70                         current_time->tm_hour, current_time->tm_min, current_time->tm_sec);
  71         updays = (unsigned) info.uptime / (unsigned)(60*60*24);
  72         if (updays)
  73                 printf("%u day%s, ", updays, (updays != 1) ? "s" : "");
  74         upminutes = (unsigned) info.uptime / (unsigned)60;
  75         uphours = (upminutes / (unsigned)60) % (unsigned)24;
  76         upminutes %= 60;
  77         if (uphours)
  78                 printf("%2u:%02u", uphours, upminutes);
  79         else
  80                 printf("%u min", upminutes);
  81
  82 #if ENABLE_FEATURE_UPTIME_UTMP_SUPPORT
  83         {
  84                 struct utmp *ut;
  85                 unsigned users = 0;
  86                 while ((ut = getutent()) != NULL) {
  87                         if ((ut->ut_type == USER_PROCESS) && (ut->ut_name[0] != '\0'))
  88                                 users++;
  89                 }
  90                 printf(",  %u users", users);
  91         }
  92 #endif
  93
  94         printf(",  load average: %u.%02u, %u.%02u, %u.%02u\n",
  95                         LOAD_INT(info.loads[0]), LOAD_FRAC(info.loads[0]),
  96                         LOAD_INT(info.loads[1]), LOAD_FRAC(info.loads[1]),
  97                         LOAD_INT(info.loads[2]), LOAD_FRAC(info.loads[2]));
  98
  99         return EXIT_SUCCESS;
 100 }