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ronments development in general has not met expectations and there are still a significant number of bugs and missing features 15 this has resulted in a poorer product than many including stallman had expected 16 in 2010 after twenty years under development stallman said that he was not very optimistic about the gnu hurd it makes some progress but to be really superior it would require solving a lot of deep problems but added that finishing it is not crucial for the gnu system because a free kernel already existed linux and completing hurd would not address the main remaining problem for a free operating system device support 17 the debian project among others have worked on the hurd project to produce binary distributions of hurd based gnu operating systems for ibm pc compatible systems after years of stagnation development picked up again in 2015 and 2016 with four releases during these two years 18 since then no release was made but distributions pick up snapshots to produce distribution releases 19 20 21 22 23 24 on august 20 2015 amid the google summer of code it was announced that gnu guix had been ported to gnu hurd 25 architecture edit general structure of monolithic microkernel and hybrid kernel based operating systems respectively unlike most unix like kernels the hurd uses a server client architecture built on a microkernel that is responsible for providing the most basic kernel services coordinating access to the hardware the cpu through process management and scheduling ram via memory management and other various input output devices via i o scheduling for sound graphics mass storage etc in theory the microkernel design would allow for all device drivers to be built as servers working in user space but today most drivers of this kind are still contained in the gnu mach kernel space 26 according to hurd developers the main advantage of microkernel based design is the ability to extend the system developing a new module would not require in depth knowledge of the rest of the kernel and a bug in one module would not crash the entire system hurd provides a concept of translators a framework of modules used to extend a file system functionality 27 from early on the hurd was developed to use gnu mach as the microkernel this was a technical decision made by richard stallman who thought it would speed up the work by saving a large part of it he has admitted that he was wrong about that 28 other unix like systems working on the mach microkernel include osf 1 lites and mklinux macos and nextstep use hybrid kernels based on mach other microkernels edit from 2004 onward various efforts were launched to port the hurd to more modern microkernels the l4 microkernel was the original choice in 2004 but progress slowed to a halt nevertheless during 2005 hurd developer neal walfield finished the initial memory management framework for the l4 hurd port and marcus brinkmann ported essential parts of glibc namely getting the process startup code working allowing programs to run thus allowing the first user programs trivial ones such as the hello world program in c to run since 2005 brinkmann and walfield started researching coyotos as a new kernel for hurd 29 30 in 2006 brinkmann met with jonathan shapiro a primary architect of the coyotos operating system to aid in and discuss the use of the coyotos kernel for gnu hurd in further discussion hurd developers realised that coyotos as well as other similar kernels are not suitable for hurd 31 in 2007 hurd developers neal walfield and marcus brinkmann gave a critique of the hurd architecture known as the critique 32 and a proposal for how a future system may be designed known as the position paper 33 in 2008 neal walfield began working on the viengoos microkernel as a modern native kernel for hurd as of 2009 update development on viengoos is paused due to walfield lacking time to work on it 34 in the meantime others have continued working on the mach variant of hurd 35 unix extensions edit this section does not cite any sources please help improve this section by adding citations to reliable sources unsourced material may be challenged and removed march 2007 learn how and when to remove this message a number of traditional unix concepts are replaced or extended in the hurd under unix every running program has an associated user id which normally corresponds to the user that started the process this id largely dictates the actions permitted to the program no outside process can change the user id of a running program a hurd process on the other hand runs under a set of user ids which can contain multiple ids one or none a sufficiently privileged process can add and remove ids to another process for example there is a password server that will hand out ids in return for a correct login password regarding the file system a suitable program can be designated as a translator for a single file or a whole directory hierarchy every access to the translated file or files below a hierarchy in the second case is in fact handled by the program for example a file translator may simply redirect read and write operations to another file like a unix symbolic link the effect of unix mounting is achieved by setting up a filesystem translator using the settrans command translators can also be used to provide services to the user for example the ftpfs translator allows a user to encapsulate remote ftp sites within a directory then standard tools such as ls cp and rm can be used to manipulate files on the remote system even more powerful translators are ones such as unionfs which allows a user to unify multiple directories into one thus listing the unified directory reveals the contents of all the directories the hurd requires a multiboot compliant boot loader such as grub architecture of the servers edit according to the debian documentation there are 24 servers 18 core servers and 6 file system servers named as follows 36 core servers edit auth authentication server receives requests and passwords from programs and gives them an id which changes the privileges of the program crash crash server handles all fatal errors exec execution server translates an executable image currently elf and a out are supported to a runnable image in memory fifo 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 37 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 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 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 edit 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 ftpfs file transfer protocol filesystem translator storeio the storage translator the servers collectively implement the posix 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 vfs of linux is achieved by libdiskfs and libpager libraries gnu distributions running hurd edit debian gnu hurd with xfce hurd based gnu distributions include arch hurd bee gnu hurd discontinued 38 debian gnu hurd gentoo gnu hurd gnu hurd live cd 39 guix system under development see also edit free and open source software portal comparison of operating system kernels gnu distributions kernel based virtual machine kvm linux libre a free version of the linux kernel multiboot specification references edit gnu hurd ported to aarch64 and more hurd news osnews com retrieved 22 april 2024 copying hurd hurd git hurd git savannah gnu org retrieved 25 february 2019 1 2 what is the gnu hurd gnu retrieved 2010 03 04 1 2 tozzi christopher 2015 04 20 30 years on hurd lives gnu updates open source unix kernel the var guy archived from the original on 2015 04 24 what is a multiserver microkernel gnu 2013 04 13 retrieved 2015 08 11 advantages gnu retrieved 2011 12 07 1 2 vervloesem koen july 7 2010 the hurd gnu s quest for the perfect kernel lwn net retrieved october 5 2012 gnu hurd origin of the name gnu retrieved 2010 03 04 gnu history cs stanford edu retrieved 2024 09 03 hillesley richard june 30 2010 gnu hurd altered visions and lost promise retrieved october 1 2012 linux and the gnu project gnu 2010 01 26 retrieved 2010 03 04 1 2 the gnu hurd history how it started gnu retrieved 2006 08 27 salus peter the daemon the gnu and the penguin archived from the original on 2023 07 10 retrieved 2006 08 08 ribeiro john 2002 03 11 free software sees gnu loose of linux pc world archived from the original on 2016 09 22 retrieved 2012 10 05 status gnu retrieved 2010 03 04 stallman richard 2006 03 09 the free software movement and the future of freedom ogg free software foundation zagreb this is the way also that people thought was the cleanest possible way to design kernels back in 1990 well it took many many many years to get this kernel to run at all and it still doesn t run well and it looks like there may be fundamental problems with this design which nobody knew about back in 1990 richard stallman the free software movement and the future of freedom march 9th 2006 free software foundation europe lecture transcript archived from the original on 2007 01 12 stallman richard 2010 07 29 rms ama reddit archived from the original on 2014 03 05 retrieved 2011 12 07 free software foundation changes priorities sd times sd times 2017 01 17 retrieved 2017 04 17 debian gnu hurd 2015 released lists debian org debian gnu hurd 2017 released lists debian org debian gnu hurd 2019 released lists debian org debian gnu hurd 2021 released lists debian org debian gnu hurd 2023 released lists debian org debian gnu hurd 2025 released lists debian org retrieved 2025 08 23 ragkousis manolis august 20 2015 gsoc update porting guix to gnu hurd mailing list guix devel retrieved august 20 2015 kousoulos constantine 2007 03 21 re device drivers in mach bug hurd mailing list doeppner thomas w 20 december 2010 operating systems in depth design and programming john wiley sons p 160 isbn 978 0 471 68723 8 retrieved 29 november 2012 stallman richard 2000 10 12 in defense of red hat linux today archived from the original on 2021 06 23 retrieved 2011 12 07 i take full responsibility for the technical decision to develop the gnu kernel based on mach a decision which seems to have been responsible for the slowness of the development i thought using mach would speed the work by saving us a large part of the job but i was wrong shapiro jonathan s 2005 10 27 re a comment about changing kernels l4 hurd mailing list bachmann tom 2006 07 07 re sel4 l4 sec and coyotos mess l4 hurd mailing list porting the hurd to another microkernel gnu hurd free software foundation retrieved 2017 05 06 walfield neal h brinkmann marcus july 2007 a critique of the gnu hurd multi server operating system pdf gnu retrieved 2011 12 07 walfield neal h brinkmann marcus 2007 01 04 improving usability via access decomposition and policy refinement pdf gnu retrieved 2011 12 07 viengoos gnu retrieved 2010 03 04 what happened to the l4 coyotos viengoos micro kernels gnu retrieved 2011 01 07 preliminary gnu hurd user interface description debian 1996 10 10 retrieved 2010 03 04 gnu hurd documentation debian 1996 10 10 retrieved 2012 07 12 gnu hurd hurd running distrib gnu 2015 05 03 retrieved 2017 09 21 gnu hurd hurd running live cd gnu 2013 04 09 retrieved 2017 09 21 external links edit wikimedia commons has media related to gnu hurd official website v t e gnu project history gnu manifesto free software foundation europe india latin america history of free software licenses gnu general public license linking exception font exception gnu lesser general public license gnu affero general public license gnu free documentation license gnat modified general public license software gnu variants hurd linux libre glibc bash coreutils findutils build system gcc binutils gdb grub gnustep gimp jami gnu emacs gnu texmacs gnu octave gnu taler gnu r gsl gmp gnu electric gnu archimedes gnunet gnu privacy guard gnuzilla icecat gnu health gnumed gnu lilypond gnu go gnu chess gnash guix more contributors benjamin mako hill bradley m kühn brian fox federico heinz john sullivan richard m stallman other topics gnu linux naming controversy revolution os free software foundation anti windows campaigns defective by design v t e unix and unix like operating systems and compatibility layers architecture filesystem history philosophy security shell operating systems bsd 386bsd freebsd netbsd openbsd dragonfly bsd darwin macos ios audioos ipados tvos watchos bridgeos dynix nextstep sunos ultrix linux android arch chromeos debian fedora gentoo red hat slackware suse ubuntu other distributions system v a ux aix hp ux irix openserver solaris opensolaris illumos tru64 unix unixware other coherent domain os gnu hurd lynxos minix mos osf 1 qnx blackberry 10 research unix serenityos xenix more compatibility layers cygwin darling eunice gnv interix machten microsoft posix subsystem mks toolkit pase p i p s pws vse af unix system services userland technologies windows services for unix windows subsystem for linux italics indicate discontinued systems category commons v t e free software foundation people geoffrey knauth henry poole richard m stallman gerald jay sussman gnu project gnu general public license gnu lesser general public license gnu affero general public license other projects free software directory fsf free software awards free software foundation anti windows campaigns defective by design sister organizations fsf europe fsf latin america fsf india league for programming freedom see also comparison of linux distributions v t e microkernels nanokernels kernels l4 family eumel l3 l4 macintosh hosted mac os nanokernel nukernel psion eka1 eka2 amiga type exec execsg quark warpos eros k42 little kernel mach gnu mach microempix µ velosity nucleus off plan b opus powerup rtlinux ti rtos kernel vanguard opera...