#include <stdio.h>
#include <stdlib.h>
#include <fcntl.h>
#include <semaphore.h>
#include <unistd.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <float.h>
#include <sys/mman.h>
#include <sys/sem.h>


int main()
{
    double *rptr;
    //FILE *fp;
    sem_t *sem;
    int fd;
    int fp = open("input.asc",O_RDONLY,0777);
    sem = sem_open("mm", O_CREAT,0777, 0);

    fd = shm_open("c", O_CREAT | O_RDWR, 0777);

    if (ftruncate(fd, sizeof(double)) == -1)

    printf("foram \n");
    rptr = (double *)mmap(NULL, sizeof(double), PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0);

    printf("foram \n");

    while(1){

       // if (feof(fp))
        //{

          //  break;
       // }

       sem_post(sem);
       read(fp,&rptr,sizeof(double));
       printf("frptr %lf \n", *rptr);
       sem_wait(sem);

    }


    *rptr = DBL_MIN;

    close(fp);
    sem_close(sem);
    sem_unlink("mm");
    shm_unlink("c");
    //munmap(rptr);
    exit(0);
}