#include <unistd.h>
#include <stdio.h>
#include <sys/mman.h>
#include <fcntl.h>
#include <stdlib.h>

typedef struct{
    int integer;
    char string[24];
}RECORD;

#define NRECORDS (100)

int main()
{
    RECORD record,*mapped;
    int i,f;
    FILE *fp;
    
    fp = fopen("records.txt","w+");
    for(i = 0;i < NRECORDS;++i)
    {
        record.integer = i;
        sprintf(record.string,"RECORD-%d",i);
        fwrite(&record,sizeof(record),1,fp);
            
    }
    fclose(fp);
}