%define SYS_GETCWD 87 ;Get current directory
%define SYS_MOUNT 88 ;Mount a filesystem
%define SYS_SELECT 89 ;Wait for file handles
+%define SYS_MARSHALFD 90 ;Create a reference to a FD suitable for handing to another process
+%define SYS_UNMARSHALFD 91 ;Accept a marshaled FD