native: Fix error handling in Windows

Some winsock error codes were not checked individually.

Add a wrapper that returns the error codes expected by POSIX/UNIX
compliant code.

junixsocket-native/src/main/c/config.c

@@ -43,3 +43,20 @@ int jux_mangleErrno(int err) {
     }
 }
 #endif
+
+#if defined(_WIN32)
+int jux_mangleErrno(int err) {
+    switch(err) {
+        case WSAEWOULDBLOCK:
+            return EWOULDBLOCK;
+        case WSAEINPROGRESS:
+            return EINPROGRESS;
+        case WSAEALREADY:
+            return EALREADY;
+        case WSAECONNRESET:
+            return ECONNRESET;
+        default:
+            return err;
+    }
+}
+#endif

junixsocket-native/src/main/c/config.h

@@ -345,7 +345,8 @@ typedef unsigned long socklen_t; /* 64-bits */
 
 // Windows requires us fetching errno for socket-related errors
 #if defined(_WIN32)
-#  define socket_errno (errno = WSAGetLastError())
+int jux_mangleErrno(int);
+#  define socket_errno (errno = jux_mangleErrno(WSAGetLastError()))
 #  define ssize_t int
 #elif defined(_OS400)
 CK_VISIBILITY_INTERNAL

junixsocket-native/src/main/c/receive.c

@@ -370,7 +370,7 @@ JNIEXPORT jint JNICALL Java_org_newsclub_net_unix_NativeUnixSocket_receive
          // no data on non-blocking socket, or terminated connection?
         if(count == 0 && theError != 0) {
             _throwException(env, kExceptionClosedChannelException, NULL);
-        } else if(theError == 0 || theError == EAGAIN || theError == ETIMEDOUT
+        } else if(theError == 0 || theError == EAGAIN || theError == EWOULDBLOCK || theError == ETIMEDOUT
 #if defined(_WIN32)
                   || theError == WSAETIMEDOUT
 #endif