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Ulrich Drepper

Ulrich Drepper
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Ulrich Drepper - Wed, 18/12/2013 - 4:34am
I will not use this blog anymore. Instead I am hosting one on my own server with a much simpler (self-written) platform. Use the RSS file here.

Ulrich Drepper - Fri, 01/06/2012 - 1:49am

The original plan was to have some program sI wrote to be added to the procps or util-linux package but the maintainers haven't been responsive. Therefore here they are in a package on their own.

I call the package putils (available from my private server) and the following programs are available so far:

Ulrich Drepper - Fri, 01/06/2012 - 1:49am


Ulrich Drepper - Thu, 31/05/2012 - 11:51pm

I've updated the pagein tool to compile with a recent valgrind version. The tarball also contains a .spec file. I had to work around a bug in valgrind in Fedora 16 and 17.

The tarball

Cancellation and C++ Exceptions

Ulrich Drepper - Thu, 05/08/2010 - 1:38am
Cancellation and C++ Exceptions

In NPTL thread cancellation is implemented using exceptions. This does not in general conflict with the mixed use of cancellation and exceptions in C++ programs. This works just fine. Some people, though, write code which doesn't behave as they expect. This is a short example:

IDN Support

Ulrich Drepper - Fri, 07/05/2010 - 5:47am
glibc has IDN support for getaddrinfo and getnameinfo for quite some time. It has to be explicitly enabled in the calls, though. Now that I can actually test this I’ve enabled IDN support in the getent program which comes with glibc. This screenshot shows getent in action. Apparently the site doesn’t use an IDN CNAME yet.

Fedora and USB Mobile Broadband

Ulrich Drepper - Tue, 04/05/2010 - 4:27pm
Outside the US I use a USB stick for Internet access. It is a Hauwei E161, similar enough to other sticks like E160 etc.

Inserting it into a standard Fedora 12 system causes only the simulated CDROM to be mounted. This dual-mode is the root of the problem.

glibc 2.10 news

Ulrich Drepper - Sat, 18/04/2009 - 12:42am

I might need a bit more space to explain the new features in glibc 2.10 than can reasonably be written down in the release notes. Therefore I’ll take some time to describe them here.

Fedora 10 a little bit more secure

Ulrich Drepper - Sat, 03/01/2009 - 12:21am
Fedora 10 comes with filesystem capability support. Unfortunately it is not used by default in the packages which can take advantage of it. I think the excuse is that there people who build their own kernels and disable it. That's nonsense since there are many other options we rely on and which can be compiled out.

Anyway, you can do the following by hand. Unfortunately you have to do it every time the program is updated again.

Secure File Desciptor Handling

Ulrich Drepper - Fri, 01/08/2008 - 11:25pm

During the 2.6.27 merge window a number of my patches were merge and now we are at the point where we can securely create file descriptors without the danger of possibly leaking information. Before I go into the details let's get some background information.

dual head xrandr configuration

Ulrich Drepper - Fri, 23/05/2008 - 5:53pm

ajax told me that extra wide screens now work with the latest Fedora 9 binaries for X11. So I had to try it out and after some experimenting I got it to work. So save others the work here is what I did.


  • AIT FireGL V3600
  • 2x Dell 3007FPW

I use the free driver, of course. No need for 3D here.

Producing PDFs

Ulrich Drepper - Thu, 22/11/2007 - 2:35am
I don't want to throw this in with the announcement of the availability of the paper on memory and cache handling but I also don't want to forget it. So, here we go.

I write all the text I can using TeX (PDFLaTeX to be exact). This leads directly to a PDF document without intermediate steps. The graphics are done using Metapost because I'm better at programming than at drawing. Metapost produces Postscript-like files which some LaTeX macros then read and directly integrate into the PDF output.

Memory and Cache Paper

Ulrich Drepper - Thu, 22/11/2007 - 2:09am
Well, it's finally done. I've uploaded the PDF of the memory and cache paper to my home page. You can download it but do not re-publish it or make it available in any form to others. I do not want multiple copies flying around, at least not while I'm still intending to maintain the document.


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