First (terrible) commit

1 files changed, 89 insertions, 0 deletions

diff --git a/client.c b/client.c
new file mode 100644
index 0000000..31707cf
--- /dev/null
+++ b/client.c
@@ -0,0 +1,89 @@
+#include <stdio.h>
+#include <signal.h>
+#include <string.h>
+#include <fcntl.h>
+
+#include <sys/time.h>
+#include <sys/socket.h>
+
+#include <netinet/in.h>
+
+#include <linux/kd.h>
+
+#define CLK_FREQ 1193180
+
+int term;
+
+enum cmd_t {CMD_KA, CMD_PING, CMD_QUIT, CMD_PLAY};
+
+struct cmd_buffer {
+	int cmd;
+	int data[8];
+};
+
+void sigalrm(int sig) {
+	ioctl(term, KIOCSOUND, 0);
+}
+
+int main(int argc, char **argv) {
+	struct sockaddr_in addr, remote;
+	int sock, rlen = sizeof(remote), i;
+	struct itimerval tmr;
+	struct cmd_buffer cmd;
+	struct sigaction sa;
+
+	if((term = open("/dev/console", O_WRONLY)) < 0) {
+		perror("open");
+		return 1;
+	}
+	if((sock = socket(AF_INET, SOCK_DGRAM, 0)) < 0) {
+		perror("socket");
+		return 1;
+	}
+
+	memset(&addr, 0, sizeof(addr));
+	addr.sin_family = AF_INET;
+	addr.sin_addr.s_addr = htonl(INADDR_ANY);
+	addr.sin_port = htons(13676);
+	if((bind(sock, (struct sockaddr *) &addr, sizeof(addr))) < 0) {
+		perror("bind");
+		return 1;
+	}
+
+	sa.sa_handler = sigalrm;
+	sa.sa_flags = SA_NODEFER | SA_RESTART;
+	sigemptyset(&sa.sa_mask);
+	sigaction(SIGALRM, &sa, NULL);
+
+	printf("Ready to begin (listening on 13676)\n");
+	memset(&tmr, 0, sizeof(tmr));
+	while(1) {
+		if(recvfrom(sock, &cmd, sizeof(cmd), 0, (struct sockaddr *) &remote, &rlen) < 0) {
+			perror("recvfrom");
+			return 1;
+		}
+		cmd.cmd = ntohl(cmd.cmd);
+		for(i = 0; i < 8; i++) cmd.data[i] = ntohl(cmd.data[i]);
+		/* printf("From %s:%d, cmd %d\n", inet_ntoa(remote.sin_addr.s_addr), remote.sin_port, cmd.cmd); */
+		switch((enum cmd_t) cmd.cmd) {
+			case CMD_QUIT:
+				return 0;
+				break;
+
+			case CMD_PING:
+				sendto(sock, &cmd, sizeof(cmd), 0, (struct sockaddr *) &remote, rlen);
+				break;
+
+			case CMD_PLAY:
+				tmr.it_value.tv_sec = cmd.data[0];
+				tmr.it_value.tv_usec = cmd.data[1];
+				setitimer(ITIMER_REAL, &tmr, NULL);
+				ioctl(term, KIOCSOUND, (int) (CLK_FREQ / cmd.data[2]));
+		
+			default:
+				printf("WARNING: Unknown cmd %d\n", cmd.cmd);
+			case CMD_KA: 
+				break;
+		}
+	}
+}