tls: prepare for ECDH_anon ciphers
[oweals/busybox.git] / 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 }