introducing files

moxerver.c

@@ -0,0 +1,120 @@
+#include "moxerver_include.h"
+#include <unistd.h> /* getopt() */
+
+
+#define SERVER_WAIT_TIMEOUT 5 /* seconds for select() timeout in server loop */
+
+/* Prints help message. */
+void usage() {
+	//TODO maybe some styling should be done
+	fprintf(stderr, "Usage: moxerver -p port [-h]\n\n");
+}
+
+/* MoxaNix main program loop. */
+int main(int argc, char *argv[]) {
+	
+	int ret;
+	
+	struct server_t server;
+	struct client_t client; //TODO working with only 1 client, this can be expanded into a list
+	unsigned int port;
+	
+	fd_set read_fds;
+	int fdmax;
+	struct timeval tv;
+	
+	
+	/* grab argumments */
+	while ((ret = getopt(argc, argv, ":p:h")) != -1) {
+		switch (ret) {
+			/* get server port number */
+			case 'p':
+				port = (unsigned int) atoi(optarg);
+				/* check port range */
+				if (port < 4001 || port > 4008) {
+					fprintf(stderr, "error: port number out of 4001-4008 range\n");
+					return -1;
+				}
+				break;
+			/* print help and exit */
+			case 'h':
+				usage();
+				return 0;
+			default:
+				fprintf(stderr, "error parsing arguments\n");
+				usage();
+				return 0;
+		}
+	}
+	
+	/* introduction message */
+	fprintf(stderr, "=== MoxaNix ===\n");
+	
+	/* initialize */
+	server_setup(&server, port);
+	client.socket = -1;
+	
+	//TODO this is a good place to create and start the TTY thread
+	
+	/* loop with timeouts waiting for client connection */
+	while (1) {
+		
+		/* setup parameters for select() */
+		tv.tv_sec = SERVER_WAIT_TIMEOUT;
+		tv.tv_usec = 0;
+		FD_ZERO(&read_fds);
+		FD_SET(server.socket, &read_fds);
+		if (client.socket != -1) {
+			FD_SET(client.socket, &read_fds); /* wait for client if connected */
+		}
+		fdmax = (server.socket > client.socket) ? server.socket : client.socket;		
+		
+		/* wait with select() */
+		ret = select(fdmax+1, &read_fds, NULL, NULL, &tv);
+		if (ret == -1) {
+			//TODO do we really break and stop server when select returns an error?
+			fprintf(stderr, "[%s:%d] error %d: %s\n", __func__, __LINE__, errno, strerror(errno));
+			break;
+		}
+		if (ret > 0) {
+			/* check server status */
+			if (FD_ISSET(server.socket, &read_fds)) {
+				fprintf(stderr, "received client connection request\n");
+				/* accept connection request if there is no client connected yet */
+				if (client.socket == -1) {
+					ret = server_accept(&server, &client);
+					if ( ret != 0) {
+						/* print error but continue waiting for connection request */
+						fprintf(stderr, "problem accepting client\n");
+						continue;
+					}
+				}
+				/* reject connection request if a client is already connected */
+				else {
+					server_reject(&server);
+				}
+			}
+			/* check client status if connected */
+			if ( (client.socket != -1) && FD_ISSET(client.socket, &read_fds) ) {
+				/* read client data */
+				ret = client_read(&client);
+				if ( ret != 0) {
+					/* print error but continue waiting for new data */
+					fprintf(stderr, "problem reading client\n");
+					continue;
+				}
+				//TODO we should send this data to TTY device
+			}
+		}
+		if (ret == 0) {
+			fprintf(stderr, "server waiting\n");
+		}
+		
+	} /* END while loop */
+	
+	/* close server and client */
+	server_close(&server);
+	client_close(&client);
+	
+	return 0;
+}