Category Archive: Programming

Jul 21

forkfd part 4: proposed solutions

Last week, I wrote three blogs about the situation with starting child processes on Unix and being notified of their exit. I raised several problems with the current implementation, which I have tried to solve and I have now a proposal for. If you haven’t yet, you should take some time to read the previous …

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Jul 13

forkfd part 3: QProcess’s requirements and current solution

In the previous posts onmy series of blogs about starting and managing sub-processes on Unix, I talked about how it’s implemented and how the current solutions have limitations. On this post, I’ll show how QtCore has solved the problem (to the extent that it can be solved) and what requirements a new solution must fulfill. …

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Jul 13

forkfd part 2: Finding out that a child process exited on Unix

On my previous blog, I said that the solutions we’ve got implemented on Linux are a good start, but not the full solution. We can start a child process properly, but we still can’t properly find out when it exited.

Jul 13

forkfd part 1: Launching processes on Unix

Have you ever tried to launch a sub-process on Unix? POSIX.1 has several APIs for doing that, including: fork+execve and posix_spawn. Starting a child process is not difficult, but ensuring that they behave properly and you get notified when the child dies, that is difficult.

May 28

“Doesn’t work” doesn’t work

Every now and again, someone posts on IRC or to a mailing lists about an issue they’ve had and their description of the problem is that “it doesn’t work”. There’s nothing more annoying to the person giving help than to see that description… That happened to me twice again today, which is what prompted me …

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