Editing GNU Hurd (section)

=== Architecture of the servers ===
According to the Debian documentation, there are 24 servers (18 core servers and 6 file system servers) named as follows:<ref name="debian-hurd-doc" />

==== Core servers ====
* '''auth''' ([[authentication server]]): Receives requests and passwords from programs and gives them an ID, which changes the privileges of the program.
* '''crash''' ([[Crash (computing)|crash]] server): Handles all fatal errors.
* '''[[Enforce In-order Execution of I/O|eieio]]''' (translation server): TODO
* '''exec''' (execution server): Translates an executable image (currently [[Executable and Linkable Format|ELF]] and [[a.out]] are supported) to a runnable image in memory.
* '''fifo''' ([[FIFO (computing and electronics)|FIFO]] translator): Implements named pipes.
* '''new-fifo''' (new FIFO server): An alternate server for named pipes.
* '''firmlink''' (the firmlink translator): Implements firmlinks ‒ "half-way between a [[symbolic link]] and a [[hard link]]".<ref>{{cite web |date=1996-10-10 |title=GNU/Hurd - Documentation |publisher=Debian |url=http://www.debian.org/ports/hurd/hurd-doc-server#firmlink |access-date=2012-07-12}}</ref>
* '''fwd''' (forward server): Forwards requests to other servers, used by fifo and symlink servers.
* '''hostmux''' (host multiplexer server)
* '''ifsock''' (server for sockets interface): Helps with UNIX domain socket addresses.
* '''init''' ([[init]] server): Basic system booting and configuration.
* '''magic''' ([[Magic (programming)|magic]] server): Signals that a name lookup must be resolved internally by a process when the result involves the process's state.
* '''null''' (null server): Implements [[/dev/null]] and /dev/zero.
* '''pfinet''' (pfinet server): Implements the PF_INET protocol family.
* '''pflocal''' (pflocal server): Implements [[UNIX domain sockets]].
* '''proc''' (process server): Assigns [[Process identifier|PIDs]] and manages process-level actions.
* '''symlink''' ([[symbolic link]] translator): Implements symbolic links for filesystems that do not support them.
* '''term''' (terminal server): A [[POSIX]] terminal.
* '''usermux''' (user multiplexer server): Invokes user-specific translators.

==== Filesystem servers ====
;ext2fs
:The [[ext2]] filesystem translator. It receives disk blocks from the microkernel and gives files and directories to the applications.
;isofs
:The translator for the [[ISO 9660]] filesystem. Translates blocks of a CD or DVD to files and directories for the applications.
;nfs
:See [[Network File System (protocol)|Network File System]].
;ftpfs
: [[File transfer protocol]] filesystem translator.
;storeio
:The storage translator.

The servers collectively implement the [[POSIX]] [[Applications programming interface|API]], with each server implementing a part of the interface. For instance, the various filesystem servers each implement the filesystem calls. The storage server will work as a wrapping layer, similar to the block layer of Linux. The equivalent of [[Virtual file system|VFS]] of [[Linux]] is achieved by libdiskfs and libpager libraries.