added tcp::islisten

Changelog

@@ -1,3 +1,6 @@
+2020-10-15:
+- added: TCP::isListen function
+
 2019-12-29:
 - added: UDP reads can be set to non blocked mode.
 

UDPTCPNetwork.h

@@ -71,6 +71,7 @@ private:
 	string remote_port;
 	int readcnt;
 	int writecnt;
+	int islisten;
 public:
 	TCP();
 	TCP(int s);
@@ -88,6 +89,7 @@ public:
 	void Close();
 	int IsConnected();
 	int IsData(int timeout);	// timeout in ms;
+	int IsListen() { return islisten; };
 
 	int Listen(int port);
 	TCP* Accept();

tcp.cc

@@ -24,6 +24,7 @@ TCP::TCP() {
 	sock = 0;
 	writecnt = 0;
 	readcnt = 0;
+	islisten = 0;
 };
 
 TCP::TCP(int s) {
@@ -33,6 +34,7 @@ TCP::TCP(int s) {
 //	memset (&remoteaddr, 0x0, sizeof(remoteaddr));
 	writecnt = 0;
 	readcnt = 0;
+	islisten = 0;
 };
 
 TCP::TCP(string h, string p) {
@@ -87,6 +89,9 @@ int TCP::Listen(int port) {
     	sock = -1;
     	return 0;
     }
+
+    islisten = 1;
+
     return 1;
 };
 
@@ -266,6 +271,7 @@ long int TCP::Write(char *buffer, long int len) {
 void TCP::Close() {
 	if (sock > 0)	close (sock);
     sock = -1;
+    islisten = false;
 };