1/* See LICENSE file for copyright and license details. */
 2
 3
 4#include <stdio.h>
 5#include <stdlib.h>
 6#include <string.h>
 7#include <time.h>
 8#include <utmpx.h>
 9
10#include "config.h"
11#include "util.h"
12
13int get_uptime(long *);
14int get_loads(double *);
15
16static void
17usage(void)
18{
19	eprintf("usage: %s\n", argv0);
20}
21
22// ?man uptime: show system uptime
23// ?man display how long the system has been running and load averages
24int
25main(int argc, char *argv[])
26{
27	struct utmpx utx;
28	FILE *ufp;
29	long uptime;
30	double loads[3];
31	time_t tmptime;
32	struct tm *now;
33	unsigned int days, hours, minutes;
34	int nusers = 0;
35	size_t n;
36
37	ARGBEGIN {
38	default:
39		usage();
40	} ARGEND;
41
42	if (argc)
43		usage();
44
45	if (get_uptime(&uptime) < 0)
46		eprintf("get_uptime:");
47	if (get_loads(loads) < 0)
48		eprintf("get_loads:");
49
50	time(&tmptime);
51	now = localtime(&tmptime);
52	printf(" %02d:%02d:%02d up ", now->tm_hour, now->tm_min, now->tm_sec);
53
54	uptime /= 60;
55	minutes = uptime % 60;
56	uptime /= 60;
57	hours = uptime % 24;
58	days = uptime / 24;
59	if (days)
60		printf("%d day%s, ", days, days != 1 ? "s" : "");
61	if (hours)
62		printf("%2d:%02d, ", hours, minutes);
63	else
64		printf("%d min, ", minutes);
65
66	if ((ufp = fopen(UTMP_PATH, "r"))) {
67		while ((n = fread(&utx, sizeof(utx), 1, ufp)) > 0) {
68			if (!utx.ut_user[0])
69				continue;
70			if (utx.ut_type != USER_PROCESS)
71				continue;
72			nusers++;
73		}
74		if (ferror(ufp))
75			eprintf("%s: read error:", UTMP_PATH);
76		fclose(ufp);
77		printf(" %d user%s, ", nusers, nusers != 1 ? "s" : "");
78	}
79
80	printf(" load average: %.02f, %.02f, %.02f\n",
81	       loads[0], loads[1], loads[2]);
82
83	if (fshut(stdin, "<stdin>") | fshut(stdout, "<stdout>"))
84		return 1;
85
86	return 0;
87}