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[[!meta copyright="Copyright © 2010, 2011 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]]."]]"""]]
A *file descriptor* is a [[concept]] of [[UNIX]], and represents a
non-[[persistent|persistency]] handle to an object (a file, for example). With
respect to specific aspects, it is comparable to a [[capability]].
This is detailed in {{$capability#wikipedia_capability-based_security}}.
In a GNU Hurd system, the concept of file descriptors is based on object
handles (through [[Mach ports|microkernel/mach/port]]), and is [[implemented in
glibc|glibc/file_descriptor]].
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