linux/uptime.c

   1 #include <sys/sysinfo.h>
   2
   3 long uptime(void) {
   4     struct sysinfo si;
   5
   6     if (sysinfo(&si) != 0)
   7     {
   8         return -1;
   9     }
  10
  11     return si.uptime;
  12 }