Hey Samuel, I think it's fairly silly that we have a open_issues/images/ directory. Why don't we start moving that stuff to $hurd-web-src/images ? This commit starts to do that. I deleted open_issues/images/overview.svg. Could you add overview.svg to $hurd-web-src/images ? I feel like trying to use git to move around svg files that I have modified a few times is going to be hard to do.
* hurd/what_is_the_gnu_hurd.mdwn: I added the image media/overview.svg This page is probably something that is viewed a lot. People like images. * open_issues/anatomy_of_a_hurd_system.mdwn: I moved the image location from open_issues/images/overview.svg -> media/overview.svg. * open_issues/images/overview.svg: I deleted that file. --- hurd/what_is_the_gnu_hurd.mdwn | 37 +- open_issues/anatomy_of_a_hurd_system.mdwn | 2 +- open_issues/images/overview.svg | 648 ---------------------- 3 files changed, 35 insertions(+), 652 deletions(-) delete mode 100644 open_issues/images/overview.svg diff --git a/hurd/what_is_the_gnu_hurd.mdwn b/hurd/what_is_the_gnu_hurd.mdwn index 8315bfff..dc7dd31a 100644 --- a/hurd/what_is_the_gnu_hurd.mdwn +++ b/hurd/what_is_the_gnu_hurd.mdwn @@ -11,7 +11,28 @@ License|/fdl]]."]]"""]] [[!meta title="What Is the GNU Hurd?"]] -The Hurd is the GNU project's replacement for the [[UNIX]] system's [[kernel]]. +The Hurd is the GNU project's replacement for the [[UNIX]] system's +[[kernel]]. Nowadays, the most popular Unix-like system is GNU/Linux +(like [GNU Guix System](https://guix.gnu.org)), whose kernel is +[Linux](https://en.wikipedia.org/wiki/Linux), which has about [8 +million lines of code](https://docs.kernel.org/process/1.Intro.html). +More if you count the device drivers, which run with full privileges. +This is what we call a monolithic kernel. Monolithic kernels are +typically faster than microkernels, but they can be less secure. A +[[microkernel]] has less code running with full privileges, and it can +be can be more secure, flexible, and robust. + +<!-- public domain image +https://upload.wikimedia.org/wikipedia/commons/6/67/OS-structure.svg +--> +[[!img media/microkernel.svg]] + +As you can see from the above image, a microkernel provides everything +a traditional monolithic kernel does, but less code is running with +full privledges. It also has a number of [[advantages]]: modularity +and extensibility, etc. The Hurd is one of the most exciting [libre +software](https://www.gnu.org/philosophy/free-sw.html) microkernels +that exists right now! You can [[use it now|hurd/running/debian]]! The Hurd is firstly a collection of protocols formalizing how different components may interact. The protocols are designed to reduce the mutual @@ -33,13 +54,23 @@ provides the same standard interfaces known from other [[UNIX]]-like systems. Thus, for a typical user, the Hurd is intended to silently work in the background providing the services and infrastructure which the [[microkernel]] itself has no business implementing, but that are required for higher level -programs and libraries to operate. +programs and libraries to operate. Let's look at an example. + +[[!img media/overview.svg]] + +Ladybird invokes glibc's `send ()`, which in turn uses the pfinet (or +lwip) TCP/IP stack, which talks to our device drivers (rump or +netdde). In this particular example, everything runs in userspace! The Hurd supplies the last major software component needed for a complete [[GNU_operating_system|running/gnu]] as originally conceived by Richard M. Stallman (RMS) in 1983. The GNU vision directly drove the creation and has guided the evolution of the [Free Software Foundation](http://fsf.org/), the -organization that is the home of the [GNU project](http://gnu.org/gnu/). +organization that is the home of the [GNU +project](http://gnu.org/gnu/). + +You can read about the current [[status]] of the Hurd, and you can +[[install it right now|hurd/running/debian]]! The Hurd development effort is a somewhat separate project from the [[Debian_GNU/Hurd|hurd/running/debian]] port. diff --git a/open_issues/anatomy_of_a_hurd_system.mdwn b/open_issues/anatomy_of_a_hurd_system.mdwn index ed1aaf97..ac5e176e 100644 --- a/open_issues/anatomy_of_a_hurd_system.mdwn +++ b/open_issues/anatomy_of_a_hurd_system.mdwn @@ -27,7 +27,7 @@ TCP/IP stack, and others. The GNU/Hurd system implements POSIX with glibc. Alm POSIX calls to glibc are re-routed to the Hurd servers. 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