[[!meta copyright="Copyright © 2008, 2009 Free Software Foundation, Inc."]]

[[!meta license="""[[!toggle id="license" text="GFDL 1.2+"]][[!toggleable
id="license" text="Permission is granted to copy, distribute and/or modify this
document under the terms of the GNU Free Documentation License, Version 1.2 or
any later version published by the Free Software Foundation; with no Invariant
Sections, no Front-Cover Texts, and no Back-Cover Texts.  A copy of the license
is included in the section entitled
[[GNU Free Documentation License|/fdl]]."]]"""]]

The [[GNU_Mach_Reference_Manual|gnumach/reference_manual]] describes the
`dealloc` flag in [Chapter 4.2.4,
Memory](http://www.gnu.org/software/hurd/gnumach-doc/Memory.html).

What exactly is `dealloc[]` (`hurd/fs.defs:dir_readdir`)?