components/OpenBSD/uptime.c

   1 /* See LICENSE file for copyright and license details. */
   2 #include <errno.h>
   3 #include <stdio.h>
   4 #include <string.h>
   5 #include <sys/sysctl.h>
   6 #include <sys/time.h>
   7
   8 #include "../../util.h"
   9
  10 const char *
  11 uptime(void)
  12 {
  13         int h;
  14         int m;
  15         int uptime = 0;
  16
  17         int mib[2];
  18         size_t size;
  19         time_t now;
  20         struct timeval boottime;
  21
  22         time(&now);
  23
  24         mib[0] = CTL_KERN;
  25         mib[1] = KERN_BOOTTIME;
  26
  27         size = sizeof(boottime);
  28
  29         if (sysctl(mib, 2, &boottime, &size, NULL, 0) != -1)
  30                 uptime = now - boottime.tv_sec;
  31         else {
  32                 fprintf(stderr, "sysctl 'KERN_BOOTTIME': %s\n", strerror(errno));
  33                 return NULL;
  34         }
  35
  36         h = uptime / 3600;
  37         m = (uptime - h * 3600) / 60;
  38
  39         return bprintf("%dh %dm", h, m);
  40 }