components/uptime.c

   1 /* See LICENSE file for copyright and license details. */
   2 #include <stdint.h>
   3 #include <stdio.h>
   4 #include <time.h>
   5
   6 #include "../util.h"
   7
   8 #if defined(CLOCK_BOOTTIME)
   9         #define UPTIME_FLAG CLOCK_BOOTTIME
  10 #elif defined(CLOCK_UPTIME)
  11         #define UPTIME_FLAG CLOCK_UPTIME
  12 #else
  13         #define UPTIME_FLAG CLOCK_MONOTONIC
  14 #endif
  15
  16 const char *
  17 uptime(void)
  18 {
  19         char warn_buf[256];
  20         uintmax_t h, m;
  21         struct timespec uptime;
  22
  23         if (clock_gettime(UPTIME_FLAG, &uptime) < 0) {
  24                 snprintf(warn_buf, 256, "clock_gettime %d", UPTIME_FLAG);
  25                 warn(warn_buf);
  26                 return NULL;
  27         }
  28
  29         h = uptime.tv_sec / 3600;
  30         m = uptime.tv_sec % 3600 / 60;
  31
  32         return bprintf("%juh %jum", h, m);
  33 }