+ """
+ fdflags(FILE, [fbic = 0], [fxor = 0], [fdbic = 0], [fdxor = 0])
+
+ Set fcntl(2) file and descriptor flags. If these are FL and FD, then
+ update:
+
+ * FL = (FL & ~FBIC) ^ FXOR
+ * FD = (FD & ~FDBIC) ^ FDXOR
+
+ FILE may be integer file descriptor or an object with `fileno' method.
+ """