#include <sys/socket.h>
#include <netinet/in.h>
#include <unistd.h>

int
main(void)
{
	int fd;
	struct sockaddr_in sa;
	sa.sin_family = AF_INET;
	sa.sin_addr.s_addr = htonl(0x7F000001);
	sa.sin_port = htons(5555);
	switch(fork()){
	case 0:
		fd = socket(PF_INET, SOCK_DGRAM, 0);
		bind(fd, (struct sockaddr*)&sa, sizeof sa);
		dup2(fd, 0);
		execl("/bin/cat", "cat", NULL);
	default:
		fd = socket(PF_INET, SOCK_DGRAM, 0);
		connect(fd, (struct sockaddr*)&sa, sizeof sa);
		dup2(fd, 1);
		execl("/bin/cat", "cat", NULL);
	}
	return 0;
}