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 (632 bytes)"
  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_NOEXEC(uptime, uptime, BB_DIR_USR_BIN, BB_SUID_DROP, uptime))
  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 #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 int uptime_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
  56 int uptime_main(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
  57 {
  58         unsigned updays, uphours, upminutes;
  59         unsigned opts;
  60         struct sysinfo info;
  61         struct tm *current_time;
  62         time_t current_secs;
  63
  64         opts = getopt32(argv, "s");
  65
  66         time(&current_secs);
  67         sysinfo(&info);
  68
  69         if (opts) // -s
  70                 current_secs -= info.uptime;
  71
  72         current_time = localtime(&current_secs);
  73
  74         if (opts) { // -s
  75                 printf("%04u-%02u-%02u %02u:%02u:%02u\n",
  76                         current_time->tm_year + 1900, current_time->tm_mon + 1, current_time->tm_mday,
  77                         current_time->tm_hour, current_time->tm_min, current_time->tm_sec
  78                 );
  79                 /* The above way of calculating boot time is wobbly,
  80                  * info.uptime has only 1 second precision, which makes
  81                  * "uptime -s" wander +- one second.
  82                  * /proc/uptime may be better, it has 0.01s precision.
  83                  */
  84                 return EXIT_SUCCESS;
  85         }
  86
  87         printf(" %02u:%02u:%02u up ",
  88                         current_time->tm_hour, current_time->tm_min, current_time->tm_sec
  89         );
  90         updays = (unsigned) info.uptime / (unsigned)(60*60*24);
  91         if (updays != 0)
  92                 printf("%u day%s, ", updays, (updays != 1) ? "s" : "");
  93         upminutes = (unsigned) info.uptime / (unsigned)60;
  94         uphours = (upminutes / (unsigned)60) % (unsigned)24;
  95         upminutes %= 60;
  96         if (uphours != 0)
  97                 printf("%2u:%02u", uphours, upminutes);
  98         else
  99                 printf("%u min", upminutes);
 100
 101 #if ENABLE_FEATURE_UPTIME_UTMP_SUPPORT
 102         {
 103                 struct utmpx *ut;
 104                 unsigned users = 0;
 105                 while ((ut = getutxent()) != NULL) {
 106                         if ((ut->ut_type == USER_PROCESS) && (ut->ut_user[0] != '\0'))
 107                                 users++;
 108                 }
 109                 printf(",  %u users", users);
 110         }
 111 #endif
 112
 113         printf(",  load average: %u.%02u, %u.%02u, %u.%02u\n",
 114                         LOAD_INT(info.loads[0]), LOAD_FRAC(info.loads[0]),
 115                         LOAD_INT(info.loads[1]), LOAD_FRAC(info.loads[1]),
 116                         LOAD_INT(info.loads[2]), LOAD_FRAC(info.loads[2]));
 117
 118         return EXIT_SUCCESS;
 119 }