created common OSAL stuff to unify UDP code

osal/common/TcpIpBase.h

@@ -0,0 +1,49 @@
+#ifndef FSFW_OSAL_COMMON_TCPIPIF_H_
+#define FSFW_OSAL_COMMON_TCPIPIF_H_
+
+#include <fsfw/returnvalues/HasReturnvaluesIF.h>
+
+#ifdef _WIN32
+
+#include <winsock2.h>
+
+#elif defined(__unix__)
+
+
+#endif
+
+class TcpIpBase {
+protected:
+
+#ifdef _WIN32
+    static constexpr int SHUT_RECV = SD_RECEIVE;
+    static constexpr int SHUT_SEND = SD_SEND;
+    static constexpr int SHUT_BOTH = SD_BOTH;
+
+    using socket_t = SOCKET;
+#elif defined(__unix__)
+    using socket_t = int;
+
+    static constexpr int INVALID_SOCKET = -1;
+    static constexpr int SOCKET_ERROR = -1;
+
+    static constexpr int SHUT_RECV = SHUT_RD;
+    static constexpr int SHUT_SEND = SHUT_WR;
+    static constexpr int SHUT_BOTH = SHUT_RDWR;
+#endif
+
+    TcpIpBase();
+    virtual ~TcpIpBase();
+
+    ReturnValue_t initialize();
+
+    int closeSocket(socket_t socket);
+
+    int getLastSocketError();
+
+    socket_t serverSocket = 0;
+
+};
+
+
+#endif /* FSFW_OSAL_COMMON_TCPIPIF_H_ */