components/uptime.c

   1 /* See LICENSE file for copyright and license details. */
   2 #include <errno.h>
   3 #include <stdio.h>
   4 #include <string.h>
   5 #if defined(__linux__)
   6 #include <sys/sysinfo.h>
   7 #elif defined(__OpenBSD__)
   8 #include <sys/sysctl.h>
   9 #include <sys/time.h>
  10 #endif
  11
  12 #include "../util.h"
  13
  14 const char *
  15 uptime(void)
  16 {
  17         int h;
  18         int m;
  19         int uptime = 0;
  20 #if defined(__linux__)
  21         struct sysinfo info;
  22
  23         sysinfo(&info);
  24         uptime = info.uptime;
  25 #elif defined(__OpenBSD__)
  26         int mib[2];
  27         size_t size;
  28         time_t now;
  29         struct timeval boottime;
  30
  31         time(&now);
  32
  33         mib[0] = CTL_KERN;
  34         mib[1] = KERN_BOOTTIME;
  35
  36         size = sizeof(boottime);
  37
  38         if (sysctl(mib, 2, &boottime, &size, NULL, 0) != -1)
  39                 uptime = now - boottime.tv_sec;
  40         else {
  41                 fprintf(stderr, "sysctl 'KERN_BOOTTIME': %s\n", strerror(errno));
  42                 return NULL;
  43         }
  44 #endif
  45         h = uptime / 3600;
  46         m = (uptime - h * 3600) / 60;
  47
  48         return bprintf("%dh %dm", h, m);
  49 }