Replaced negative exit codes with positive ones or 'errno'

main.c

@@ -38,7 +38,7 @@ int main(int argc,char* argv[]) {
 
 	if (argc != 5) {
 		print_prog_info();
-		exit(-30);
+		exit(30);
 	}
 
 
@@ -52,7 +52,7 @@ int main(int argc,char* argv[]) {
 	printf("Using %d for local\nUsing %d for remote\n",preferred_local_network,preferred_remote_network);
 
 	if ((preferred_local_network == -1) || (preferred_remote_network == -1)) {
-		exit(-7);
+		exit(7);
 	}
 
 	char preferred_transport = 'T';
@@ -64,7 +64,7 @@ int main(int argc,char* argv[]) {
 	} else if (check_ip_ver(local_addr) == 6) {
 		addrlen = sizeof(struct sockaddr_in6);
 	} else {
-		exit(-7);
+		exit(7);
 	}
 
 	listen(server_sock,50);  /* Arbitrary number, change later */