Nesta última sexta-feira, dia 30/11/2012, estive presente na sétima edição do SoLiSC 2012, em Florianópolis, para apresentar uma palestra introdutória sobre o GDB. Este é um relato sobre minha particição no evento :-).

Impressões sobre o evento

Foi a primeira vez que fui ao SoLiSC. Já tive vontade de ir em anos anteriores, mas infelizmente sempre havia algo para atrapalhar. No entanto, nesse ano felizmente tudo correu bem, e inclusive tive uma palestra aceita! Ou seja, um ótimo motivo para visitar Floripa e rever o mar :-D.

Hi there. This little post is just a heads about an issue that I am facing with the comment system that I run. Unfortunately, you will not be able to post comments on the blog until, at least, next Wednesday (November 21).

For those of you wondering which comment system I use, it is called Juvia. Due to privacy concerns, I chose not to use anything like Disqus because it tracks you and your comments (read their privacy policy if you want more details). On the other hand, Juvia runs on my private personal server, and does not collect any kind of personal information when you make a comment. The cons of this approach is that when my personal server is down (like now), the blog doesn’t have comments. But that’s a minor price to pay for the respect of privacy, I think.

Hi everybody :-).

I finally got some time to finish this series of posts, and I hope you like the overall result. For those of you who are reading this blog for the first time, you can access the first post here, and the second here.

My goal with this third post is to talk a little bit about how you can use the SDT probes with tracepoints inside GDB. Maybe this particular feature will not be so helpful to you, but I recommend reading the post either way. I will also give a brief explanation about how the SDT probes are laid out inside the binary. So, let’s start!

I tell you this: it is depressing when you realize that you spent more time struggling with blog engines than writing posts on your blog!

It’s been a long time since I wrote the first post about this subject, and since then the patches have been accepted upstream, and GDB 7.5 now has official support for userspace SystemTap probes :-). Yay!

Well, but enough of cheap talk, let’s get to the business!

Conforme eu havia comentado no post anterior, segue o relato sobre as apresentações que fiz na Semana da Computação da UNESP de Rio Claro.

TL;DR: Gostei de ter tido a oportunidade de dar as apresentações, e principalmente de ter feito minha primeira palestra como Embaixador do Projeto Fedora no Brasil. Sobre a palestra a respeito do GDB, também gostei do jeito que ela foi conduzida. Notei algumas falhas que precisam ser corrigidas, mas no geral a experiência foi muito boa.

Hoje, dia 23/10/2012, estarei na UNESP de Rio Claro para dar duas apresentações na Semana da Computação.

A primeira palestra será sobre o Projeto Fedora. Vai ser a primeira vez que falarei sobre o projeto depois de ter me tornado Embaixador do Fedora no Brasil. Confesso que estou um pouco apreensivo, mas escolhi slides muito bons feitos pelo Paul W. Frields, ex-líder do Projeto e bastante competente em suas apresentações. Pretendo fazer um relato sobre a palestra na quarta-feira.

Well, well. I really wasn’t entirely satisfied with Octopress, so I decided to change the blog engine yet another time!! Here it is, using blohg, a blog engine based on Mercurial (yeah, I know, nothing is perfect), and made by a Brazilian :-).

I intend to resume my activities in the blog pretty soon, especially because I have many things to share here. First of all, I will convert the old posts from Markup to rst.

After a long time, here we are again :-).

With this post I will start to talk about the integration between GDB and SystemTap. This is something that Tom Tromey and I did during the last year. The patch is being reviewed as I write this post, and I expect to see it checked-in in the next few days/weeks. But let’s get our hands dirty…

SystemTap Userspace Probes

You probably use (or have at least heard of) SystemTap, and maybe you think the tool is only useful for kernel inspections. If that’s your case, I have a good news: you’re wrong! You can actually use SystemTap to inspect userspace applications too, by using what we call SDT probes, or Static Defined Tracing probes. This is a very cheap and easy way to include probes in your application, and you can even specify arguments to those probes.

This post is actually a “reply” to Gary Benson’s Working on gdb post.

I have been working with GDB for quite some time now, and even though the project officially uses CVS (yes, you read it correctly, it is CVS indeed!) as its version control system, fortunately we also have a git mirror. In the end, what happens is that almost every developer uses the git mirror and just goes to CVS to commit something. But this is another discussion. Aside of this git mirror, we also have the Archer repository (which uses git by default).