A TIME Server

#define UNIXEPOCH 2208988800

/*------------------------------------------------------------------------
 * main - Iterative UDP server for TIME service
 *------------------------------------------------------------------------
 */
int main(int argc, char *argv[])
{
    struct sockaddr_in fsin;
    char *service = "time";
    char buf[1];
    int sock;
    time_t now;
    int alen;

    sock = passiveUDP(service);

    while (1) {
        alen = sizeof(fsin);
        if (recvfrom(sock, buf, sizeof(buf), 0,
            (struct sockaddr *)&fsin, &alen) < 0)
            errexit("recvfrom: %s\n", strerror(errno));
        time(&now);
        now = htonl((u_long)(now + UNIXEPOCH));
        sendto(sock, (char *)&now, sizeof(now), 0,
            (struct sockaddr *)&fsin, sizeof(fsin));
    }
}