-%define SYS_IOCTL 75 ;Perform an IOCtl Call
-%define SYS_SEEK 76 ;Seek to a new position in the file
-%define SYS_READDIR 77 ;Read from an open directory
-%define SYS_GETACL 78 ;Get an ACL Value
-%define SYS_SETACL 79 ;Set an ACL Value
-%define SYS_FINFO 80 ;Get file information
-%define SYS_MKDIR 81 ;Create a new directory
-%define SYS_LINK 82 ;Create a new link to a file
-%define SYS_SYMLINK 83 ;Create a symbolic link
-%define SYS_UNLINK 84 ;Delete a file
-%define SYS_TELL 85 ;Return the current file position
-%define SYS_CHDIR 86 ;Change current directory
-%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
+%define SYS_TRUNCATE 75 ;Change the size of an open file
+%define SYS_IOCTL 76 ;Perform an IOCtl Call
+%define SYS_SEEK 77 ;Seek to a new position in the file
+%define SYS_READDIR 78 ;Read from an open directory
+%define SYS_GETACL 79 ;Get an ACL Value
+%define SYS_SETACL 80 ;Set an ACL Value
+%define SYS_FINFO 81 ;Get file information
+%define SYS_MKDIR 82 ;Create a new directory
+%define SYS_LINK 83 ;Create a new link to a file
+%define SYS_SYMLINK 84 ;Create a symbolic link
+%define SYS_UNLINK 85 ;Delete a file
+%define SYS_TELL 86 ;Return the current file position
+%define SYS_CHDIR 87 ;Change current directory
+%define SYS_GETCWD 88 ;Get current directory
+%define SYS_MOUNT 89 ;Mount a filesystem
+%define SYS_SELECT 90 ;Wait for file handles
+%define SYS_MMAP 91 ;Map a file into this address space
+%define SYS_MUNMAP 92 ;Unmap a file
+%define SYS_MARSHALFD 93 ;Create a reference to a FD suitable for handing to another process
+%define SYS_UNMARSHALFD 94 ;Accept a marshaled FD