+/**
+ * \brief Copy one FD to another
+ * \param SrcFD Source file descriptor
+ * \param DstFD Destination file descriptor (-1 means allocate new)
+ */
+extern int VFS_DuplicateFD(int SrcFD, int DstFD);
+
+/**
+ * \brief Update the flags on a FD
+ */
+extern int VFS_SetFDFlags(int FD, int Mask, int Value);
+
+/**
+ * \brief Save specified file handle such that it can be passed between processes
+ * \param FD File descriptor to save
+ * \return Marshalled handle, or (uint64_t)-1 on error
+ */
+extern Uint64 VFS_MarshalHandle(int FD);
+
+/**
+ * \brief Restore a marshalled handle into the current process
+ * \param Handle returned by VFS_MarshalHandle
+ * \return File descriptor, or -1 on error
+ */
+extern int VFS_UnmarshalHandle(Uint64 Handle);
+