update help

@@ -63,8 +63,11 @@ CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 	(void)0
 
 // server info.
-#define RTMP_SIG_SRS_NAME "srs(simple rtmp server)"
+#define RTMP_SIG_SRS_KEY "srs"
+#define RTMP_SIG_SRS_NAME RTMP_SIG_SRS_KEY"(simple rtmp server)"
 #define RTMP_SIG_SRS_URL "https://github.com/winlinvip/simple-rtmp-server"
+#define RTMP_SIG_SRS_WEB "http://blog.csdn.net/win_lin"
+#define RTMP_SIG_SRS_EMAIL "winterserver@126.com"
 #define RTMP_SIG_SRS_VERSION "0.1"
 
 // compare

@@ -25,16 +25,33 @@ CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 #include <srs_core_error.hpp>
 #include <srs_core_server.hpp>
 
-int main(int /*argc*/, char** /*argv*/){
+#include <stdlib.h>
+
+int main(int argc, char** argv){
 	int ret = ERROR_SUCCESS;
 	
+	if (argc <= 1) {
+		printf(RTMP_SIG_SRS_NAME" "RTMP_SIG_SRS_VERSION
+			" Copyright (c) 2013 winlin\n"
+			"Usage: %s <listen_port>\n" 
+			"\n"
+			RTMP_SIG_SRS_WEB"\n"
+			RTMP_SIG_SRS_URL"\n"
+			"Email: "RTMP_SIG_SRS_EMAIL"\n",
+			argv[0]);
+		exit(1);
+	}
+	
+	int listen_port = ::atoi(argv[1]);
+	srs_trace("listen_port=%d", listen_port);
+	
 	SrsServer server;
 	
 	if ((ret = server.initialize()) != ERROR_SUCCESS) {
 		return ret;
 	}
 	
-	if ((ret = server.listen(1935)) != ERROR_SUCCESS) {
+	if ((ret = server.listen(listen_port)) != ERROR_SUCCESS) {
 		return ret;
 	}