Programming

#include <sys/types.h>
#include <unistd.h>
#include <stdio.h>
#include <stdlib.h>
#include <pthread.h>
#include <string.h>
 
void *thread_function (void *arg);
char message [] = "Hello World";
int fd[2]; // Creating file descriptor
char buff [100];
 
int main()
{
  pipe (fd); //creating unnamed pipe
  pid_t pid;
  pthread_t a_thread;
  void *thread_result;
  pid = fork();
  switch(pid)
  {
    case -1:
      perror("fork failed");
      exit(1);
    case 0: // creating child
      printf("Child Running\n");
      pthread_create (&a_thread, NULL, thread_function, (void *)message);
      sleep (3);
    default:
      break;
  }
  close (fd[1]); //closing write file descriptor
  close (fd[0]); //closing read file descriptor
  exit(0);
}
 
 
void *thread_function (void *arg)
{
  printf ("Thread running\n");
  sleep (3);
  write (fd[1], message, strlen (message)); // writing to pipe
  read (fd[0], buff, strlen (message)); // reading from file
  printf ("Message is: %s\n", buff);
  pthread_exit("thread exiting");
}