/* hellofork.c - Saying Hello World with fork
 */

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

#define MAXLINE 256

int main(void)
{
  int	n, fd[2];
  pid_t	pid;
  char	line[MAXLINE];
  
  if (pipe(fd) < 0) {
    fprintf(stderr, "pipe error\n");
    exit(1);}
  if ( (pid = fork()) < 0) {
    fprintf(stderr, "fork error\n");
    exit(1);}
  else if (pid == 0) {		/* child */
    close(fd[0]);
    write(fd[1], "hello world\n", 12);
  } else {			/* parent */
    close(fd[1]);
    n = read(fd[0], line, MAXLINE);
    write(STDOUT_FILENO, line, n);}
  return (0);
}