pid_t pid;
int listenfd, connfd;

listenfd = Socket(...);

/* fill in sockaddr_in{} with server's well-known port */
Bind(listenfd, ...);

Listen(listenfd, LISTENQ);

for (;;) {
  connfd = Accept(listenfd, ...); /* probably blocks */
  if ((pid = Fork()) == 0) {
    Close(listenfd); /* child closes listening socket */
    doit(connfd); /* process the request */
    Close(connfd); /* done with this client */
    exit(0); /* child terminates */
  }
  Close(connfd);  /* parent closes connected socket */
}