/* 
 * File:   main.c
 * Author: norte
 *
 * Created on December 7, 2014, 11:38 AM
 */

#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <sys/wait.h>
#define FILE_NAME "Input.txt"
#define N 5

int main(int argc, char** argv) {
    int A[N][N],i,j;
    int sum[N]={};
    int check;
    FILE *f;
    int buffer;
    if ((f=fopen(FILE_NAME,"r"))==NULL)
    {
        printf("File '%s' didn't found",FILE_NAME);
        return 1;
    }
    int fd[2];
    int p[N],l;
    int buf,temp;
     
    for (i=0;i<N*N;++i)
        {
            fscanf(f,"%d",&A[0][i]);
        }
    if (pipe(fd)<0) // Make pipe
    {
        printf("Error pipe()\n");
        return 1;
    }
   
    check=getpid();  // remember father PID
    
    for (i=0; i<5; ++i)
    {

        if (getpid()==check){ // Real father?
            
            if ((p[i]=fork())<0) // Make son
                {
                    printf("Error fork()\n");
                    return 1;
                }
            else
                if (p[i]!=0)
                    {
                        wait(NULL);
                    }
                else
                    {
                    printf("Son process: %d, Father: %d  ",getpid(),getppid());
                            for (j=0;j<N;++j)
                            {
                                sum[i]+=A[i][j];
                                printf("%d ",A[i][j]);
                            } 
                            close(fd[0]);
                            printf("%d ",sum[i]);          
                            buffer=sum[i];
                            write(fd[1],&buffer,1);
                                                            
                    }
        }
    }
    printf("\n");
    if (getpid()==check)
    {    
        printf("From main process: ");
        for (i=0; i<5; i++)
        {
            close(fd[1]);
            read(fd[0],&temp,1);
            printf("|%d| ",temp);
        }
    }
    return (EXIT_SUCCESS);
}