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