/* On idle we spin checking for the terminals. Gives us more responsiveness
for the polled ports */
void platform_idle(void)
{
irqflags_t irq = di();
tty_poll();
sync_clock();
irqrestore(irq);
}
int main() {
//inits
int sock;
struct sockaddr_in bind_addr;
//create socket file descriptor( AF_INET = ipv4 address family; SOCK_DGRAM = UDP; 0 = default protocol)
sock = socket(AF_INET, SOCK_DGRAM, 0);
if(unlikely(sock == -1)) {
ERROR("ERROR creating socket!");
exit(EXIT_FAILURE);
} else {
printf("Socket created!\n");
}
//set details for socket to bind
memset(&bind_addr, '\0', sizeof(bind_addr));
bind_addr.sin_family = AF_INET;
bind_addr.sin_addr.s_addr = INADDR_ANY; //bind to all interfaces
//htons = host to network byte order, necessary for universal understanding by all machines
bind_addr.sin_port = htons(PORT);
//bind socket
if(unlikely(bind(sock, (struct sockaddr *) &bind_addr, sizeof(bind_addr)) < 0)) {
close_socket(sock);
ERROR("ERROR binding!\n");
exit(EXIT_FAILURE);
} else {
printf("Bound successfully!\n");
}
//signal handling to elegantly exit and close socket on ctrl+c
struct sigaction sa;
sa.sa_handler = sig_handler;
sigemptyset(&sa.sa_mask);
sa.sa_flags = 0;
sigaction(SIGINT, &sa, NULL);
//determine what to do
while(1) {
printf("\nReady to receive requests on port %d...\n", PORT);
struct sockaddr_in addr = {0};
char buffer[FIXED_BUFFER] = {0};
receive_packet(&sock, buffer, sizeof(buffer), NULL, &addr);
if(strcmp(buffer, "sync") == 0) {
send_packet(&sock, "ready", 5, NULL, &addr);
int t = 0;
receive_packet(&sock, &t, sizeof(t), NULL, NULL);
sync_clock(t, &sock, &addr);
}
else {
printf("Received invalid request...\n");
send_packet(&sock, HELLO, sizeof(HELLO), NULL, &addr);
}
}
return 0;
}
