Using Pipes

Child Code

#include<stdio.h>
#include<unistd.h>
#include<stdlib.h>
 
int main(int argc,char *argv[])
{
    char buf[11];
    int pipedesc;
    puts("child started");
    pipedesc = atoi(argv[0]);
    while(1)
    {
        read(pipedesc,buf,10);
        puts(buf);
        sleep(2);
    }
    return 0;
}

Parent Code

#include<stdio.h>
#include<unistd.h>
#include<stdlib.h>
 
int main(int argc,char *argv[])
{
    char buf[11]="hello";
    int pipedesc,i=0;
    pipedesc = atoi(argv[0]);
    puts("parent started:");
    while(1)
    {
        i++;
        sprintf(buf,"hello:%d",i);
        write(pipedesc,buf,10);
        sleep(2);
    }
    return 0;
}

Running All

#include<stdio.h>
#include<unistd.h>
 
int main()
{
    int arr[2];
    char argv[30];
    pipe(arr);
    if(fork())
    {
        puts("starting parent");
        close(arr[0]);
        sprintf(argv,"%d",arr[1]);
        execlp("./pipeExampleParent",argv,NULL);
    }
    else
    {
        puts("starting child");
        close(arr[1]);
        sprintf(argv,"%d",arr[0]);
        execlp("./pipeExample",argv,NULL);
    }
    return 1;
}