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# Emilio Pozuelo Monfort

Email: pochu27@gmail.com

---

# GSoC 2010: Hurd: Fix Compatibility Problems Exposed by Testsuites

Mentor: Carl Fredrik Hammar

## Abstract

This project will consist of identifiying some projects' test suite
failures when executed on GNU/Hurd, debugging them, and if they are
truly GNU/Hurd issues (and not problems in the projects themselves),
fixing them.

## Timeline

### Before April 28
* Investigated the glib's gtester problem and tracked it down:
  [bug 28934](https://savannah.gnu.org/bugs/?28934). Prepared a patch
  but it's not good.
* [glib's garray test timeouts on Hurd](https://bugzilla.gnome.org/show_bug.cgi?id=568760).
  The tests passes if the timeout is increased. The current upstream timeout
  (10s) is quite small (it fails on many Debian builds for some Linux arches).
  However on Hurd it needs a very big time it seems (like more than 100s).
  Maybe do an allocation benchmarch?
* Investigated glib's unix-fd test failure: getsockopt() isn't implemented
  on Hurd. Need to implement it in hurd/pflocal/socket.c.
* Investigated coreutils' ln EIEIO, with Samuel's help. linkat() is buggy.
  Reported as [bug 29655](https://savannah.gnu.org/bugs/?29655). Prepared a
  patch, waiting on the copyright paperwork before submitting it to libc-alpha.
  Got part of it already (committed)[http://sources.redhat.com/ml/libc-alpha/2010-04/msg00046.html].
* Investigated coreutils' cp EACCES. Test case: 'mkfifo a && cp -R --copy-contents a b'.
  Problem is that O_NOFOLLOW adds O_NOTRANS.


### April 28 - May 5
* Submitted a talk proposal on Hurd with Michael Banck for DebConf
* Sent request to assign copyright to the FSF for Hurd/Mach/libc

### May 5 - May 12
* Read http://www.gnu.org/software/hurd/hurd-paper.html
* Improved the linkat() patch
* Fixed the issues mentioned in bug 28934, but after doing so I realized
  that wouldn't work well. The only good solution is to pass file_name
  from execve() to the exec server, so we need new RPCs.

### May 12 - May 19
* Read http://www.gnu.org/software/hurd/hurd-talk.html
* Half read http://www.gnu.org/software/hurd/hacking-guide/hhg.html
* Read many Hurd interfaces (fs.defs, auth.defs, fsys.defs, io.defs,
  password.defs).


## TODO


## Documentation
* [Towards a New Strategy of OS Design, an architectural overview by Thomas Bushnell, BSG](http://www.gnu.org/software/hurd/hurd-paper.html)
* [The Hurd, a presentation by Marcus Brinkmann](http://www.gnu.org/software/hurd/hurd-talk.html)
* [The Hurd Hacking Guide](http://www.gnu.org/software/hurd/hacking-guide/hhg.html)