src/hotspot/os/bsd/os_bsd.cpp

rev 56978 : 8234397: add OS uptime information to os::print_os_info output

*** 167,176 ****
--- 167,192 ----
    }
  #endif
    return available;
  }
  
+ // for more info see :
+ // https://developer.apple.com/library/archive/documentation/System/Conceptual/ManPages_iPhoneOS/man3/sysctl.3.html
+ void os::Bsd::print_uptime_info(outputStream* st) {
+   struct timeval boottime;
+   size_t len = sizeof(boottime);
+   int mib[2];
+   mib[0] = CTL_KERN;
+   mib[1] = KERN_BOOTTIME;
+ 
+   if (sysctl(mib, 2, &boottime, &len, NULL, 0) >= 0) {
+     time_t bootsec = boottime.tv_sec, currsec = time(NULL);
+     double tdiff = difftime(currsec, bootsec);
+     st->print_cr("OS uptime (in days): %.2lf", tdiff/(60.0*60.0*24.0));
+   }
+ }
+ 
  julong os::physical_memory() {
    return Bsd::physical_memory();
  }
  
  // Return true if user is running as root.
*** 1568,1577 ****
--- 1584,1595 ----
  void os::print_os_info(outputStream* st) {
    st->print("OS:");
  
    os::Posix::print_uname_info(st);
  
+   os::Bsd::print_uptime_info(st);
+ 
    os::Posix::print_rlimit_info(st);
  
    os::Posix::print_load_average(st);
  }