main.c

#include <sys/sysinfo.h>                                                                                    
#include <stdio.h>                                                                
#include <stdbool.h>                                       
                                                    
bool is_multicore_system(void) {                                
  return (get_nprocs_conf() > 1) ? true : false;                                
}                                                            

// wrapper emulates single processor system
int __wrap_get_nprocs_conf() { return 1; }                                
                                                   
int main(int argc, char *argv[])                                
{                                
  is_multicore_system() ? printf("multicore system\n") : printf("singlecore system\n");                                
  return 0;                                                                  
}