#include <stdio.h>
#include <unistd.h>
#include <sys/types.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#define MAX_CHILDREN 3

int main(int argc, char *argv[])
{
    pid_t pid;

    int fd[2];

    char buffer[100];

    char str[] = "Hello";
    char str2[] = "Hello2";
    char str3[] = "Hello3";

    for(int num_process = 0; num_process < MAX_CHILDREN; num_process++)
    {
        if(pipe(fd) == -1)
        {
            perror( "pipe Failed" );
            continue;
        }

        pid = fork();

        if(pid < 0)
        {
            perror("fork failed");
            exit(1);
        }

        if(pid == 0)
        { //child code

        if(num_process == 0){
                printf("Child %i (pid= %i) send string %sn", num_process, getpid(),str);
                write(fd[1],str,strlen(str));
            }
        if(num_process == 1){
                printf("Child %i (pid= %i) send string %sn", num_process, getpid(),str2);
                write(fd[1],str2,strlen(str2));
        }
        if(num_process == 2){
                printf("Child %i (pid= %i) send string %sn", num_process, getpid(),str3);
                write(fd[1],str3,strlen(str3));
        }
            exit(0);
        }

        else{//parent
            printf("Im parent %in",getpid());
            wait(NULL);
        }
    }

    //Creating another child process from parent, this process recieves string sent from
    //childs
    pid = fork();

        if(pid < 0)
        {
            perror("fork failed");
            exit(1);
        }
    if(pid == 0){//child
    printf("The new process %i read fd pipen",getpid());
    if( read(fd[0],buffer,sizeof(buffer)) <= 0) //read pipe
    {
        perror("error read");
        exit( EXIT_FAILURE );
    }
    printf("String readed : %sn",buffer);
    }
    else{//parent
        wait(NULL);
    }

    return 0;
}