#include <pthread.h>
#include <unistd.h>
#include <stdlib.h>

static int p1[2], p2[2];

#define N 1000000

void *server(void *_)
{
	char buf;

	while (read(p1[0], &buf, 1) == 1)
		write(p2[1], &buf, 1);
}

void client()
{
	char buf;
	int i;

	for (i = 0; i < N; ++i) {
		write(p1[1], &buf, 1);
		read(p2[0], &buf, 1);
	}
}

int main(int ac, char **av)
{
	pthread_t thread;

	pipe(p1);
	pipe(p2);

	if (ac < 2 || strcmp(av[1], "fork") != 0)
		pthread_create(&thread, NULL, server, NULL);
	else
		if (fork() == 0) {
			server(NULL);
			return 0;
		}
	client();
	return 0;
}