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 //config:config UPTIME
  15 //config:       bool "uptime"
  16 //config:       default y
  17 //config:       select PLATFORM_LINUX #sysinfo()
  18 //config:       help
  19 //config:         uptime gives a one line display of the current time, how long
  20 //config:         the system has been running, how many users are currently logged
  21 //config:         on, and the system load averages for the past 1, 5, and 15 minutes.
  22 //config:
  23 //config:config FEATURE_UPTIME_UTMP_SUPPORT
  24 //config:       bool "Show the number of users"
  25 //config:       default y
  26 //config:       depends on UPTIME && FEATURE_UTMP
  27 //config:       help
  28 //config:         Display the number of users currently logged on.
  29
  30 //applet:IF_UPTIME(APPLET(uptime, BB_DIR_USR_BIN, BB_SUID_DROP))
  31
  32 //kbuild:lib-$(CONFIG_UPTIME) += uptime.o
  33
  34 //usage:#define uptime_trivial_usage
  35 //usage:       ""
  36 //usage:#define uptime_full_usage "\n\n"
  37 //usage:       "Display the time since the last boot"
  38 //usage:
  39 //usage:#define uptime_example_usage
  40 //usage:       "$ uptime\n"
  41 //usage:       "  1:55pm  up  2:30, load average: 0.09, 0.04, 0.00\n"
  42
  43 #include "libbb.h"
  44 #ifdef __linux__
  45 # include <sys/sysinfo.h>
  46 #endif
  47
  48
  49 #ifndef FSHIFT
  50 # define FSHIFT 16              /* nr of bits of precision */
  51 #endif
  52 #define FIXED_1      (1 << FSHIFT)     /* 1.0 as fixed-point */
  53 #define LOAD_INT(x)  (unsigned)((x) >> FSHIFT)
  54 #define LOAD_FRAC(x) LOAD_INT(((x) & (FIXED_1 - 1)) * 100)
  55
  56
  57 int uptime_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
  58 int uptime_main(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
  59 {
  60         unsigned updays, uphours, upminutes;
  61         struct sysinfo info;
  62         struct tm *current_time;
  63         time_t current_secs;
  64
  65         time(&current_secs);
  66         current_time = localtime(&current_secs);
  67
  68         sysinfo(&info);
  69
  70         printf(" %02u:%02u:%02u up ",
  71                         current_time->tm_hour, current_time->tm_min, current_time->tm_sec);
  72         updays = (unsigned) info.uptime / (unsigned)(60*60*24);
  73         if (updays)
  74                 printf("%u day%s, ", updays, (updays != 1) ? "s" : "");
  75         upminutes = (unsigned) info.uptime / (unsigned)60;
  76         uphours = (upminutes / (unsigned)60) % (unsigned)24;
  77         upminutes %= 60;
  78         if (uphours)
  79                 printf("%2u:%02u", uphours, upminutes);
  80         else
  81                 printf("%u min", upminutes);
  82
  83 #if ENABLE_FEATURE_UPTIME_UTMP_SUPPORT
  84         {
  85                 struct utmpx *ut;
  86                 unsigned users = 0;
  87                 while ((ut = getutxent()) != NULL) {
  88                         if ((ut->ut_type == USER_PROCESS) && (ut->ut_user[0] != '\0'))
  89                                 users++;
  90                 }
  91                 printf(",  %u users", users);
  92         }
  93 #endif
  94
  95         printf(",  load average: %u.%02u, %u.%02u, %u.%02u\n",
  96                         LOAD_INT(info.loads[0]), LOAD_FRAC(info.loads[0]),
  97                         LOAD_INT(info.loads[1]), LOAD_FRAC(info.loads[1]),
  98                         LOAD_INT(info.loads[2]), LOAD_FRAC(info.loads[2]));
  99
 100         return EXIT_SUCCESS;
 101 }