/* ----------------------------------------------------------------- */
/* 	PROGRAM fork_wait.c                                                 */
/*  This program runs two processes, a parent and a child.  */
/*	The use of wait system call guarantees the child process will print */
/* 	its message before the parent proces             */
/* ----------------------------------------------------------------- */

#include <stdio.h>
#include <sys/wait.h> /* contains prototype for wait */
int main(void)
{
	int pid;
	int status;
	printf("Hello World!\n");
	pid = fork( );
	if (pid == -1) /* check for error in fork */
	{
		perror("bad fork");
		exit(1);
	}
		if (pid == 0)
			printf("I am the child process.\n");
		else
		{
			wait(&status); /* parent waits for child to finish */
			printf("I am the parent process.\n");
		}
}