native: Implement dup for Windows sockets

Best effort though (works for AF_UNIX).
kohlschutter · Feb 14, 2024 · c2602d3 · c2602d3
1 parent fa55ed4
commit c2602d3
Showing 1 changed file with 20 additions and 0 deletions.
diff --git a/junixsocket-native/src/main/c/filedescriptors.c b/junixsocket-native/src/main/c/filedescriptors.c
@@ -618,6 +618,26 @@ JNIEXPORT jobject JNICALL Java_org_newsclub_net_unix_NativeUnixSocket_duplicate
     } else {
         targetFD = dup2(sourceFD, targetFD);
     }
+
+#if defined(_WIN32)
+    if(targetFD == -1 && errno == EBADF) {
+        WSAPROTOCOL_INFO protocolInfo;
+        if(WSADuplicateSocket(sourceFD, GetCurrentProcessId(), &protocolInfo) != 0) {
+            _throwErrnumException(env, socket_errno, NULL);
+            return NULL;
+        }
+        SOCKET targetSocket = WSASocket(protocolInfo.iAddressFamily,
+                                        protocolInfo.iSocketType,
+                                        protocolInfo.iProtocol,&protocolInfo, 0, 0);
+        if(targetSocket == INVALID_SOCKET) {
+            _throwErrnumException(env, socket_errno, NULL);
+            return NULL;
+        }
+
+        targetFD = targetSocket;
+    }
+#endif
+
     if(targetFD == -1) {
         _throwErrnumException(env, errno, NULL);
         return NULL;