c program to demonstrate / simulating pipes in c .

main.c

//Demonstration of pipes in c 
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/wait.h>
#include <unistd.h>
int main(int argc, char* argv){
    int fd[2];
    if(pipe(fd) == -1){
        return 1;
      
    }
  int pid1 = fork();
  if (pid1 < 0){
    return 2;
    }
  if (pid1 == 0){  
      dup2(fd[1],STDOUT_FILENO);
      close(fd[0]);
      close(fd[1]);
      execlp("ping","ping","-c","5","google.com",NULL);
      }
  int pid2 = fork();
  if(pid2<0){
    return 3;
    }
  if (pid2 == 0){
    dup2(fd[0], STDIN_FILENO);
    close(fd[0]);
    close(fd[1]);
    execlp("grep","grep","rtt",NULL);
    }
    waitpid(pid1, NULL, 0);
    return 0;
    }