clock_gettime_example.cpp

#include <cstdlib>
#include <iostream>
#include <cstring>
#include <time.h>

int
main( int argc, char **argv )
{
   struct timespec curr_time;
   std::memset( &curr_time, 
                0, 
                sizeof( struct timespec ) );
   if( clock_gettime( CLOCK_REALTIME, &curr_time ) != 0 )
   {
      perror( "Failed to get time!\n" );
   }
   
   std::cout << "Seconds: " << curr_time.tv_sec << "\n";
   std::cout << "Nanoseconds: " << curr_time.tv_nsec << "\n";
   std::cout << "Combined: " << 
      (double) curr_time.tv_sec + ((double) curr_time.tv_nsec * 1.0e-9 )  << "\n";
   
   return( EXIT_FAILURE );
} 

fixed file extension