25 Years of Free Software

When did I start writing Free Software, now called Open Source? That’s a tricky question. Does the time start with the first file edited, the first time it compiles or perhaps even some proto-program you use to work out a concept for the real program formed later on.

So using the date you start writing, especially in a era before decent version control systems, is problematic. That is why I use the date of the first release of the first package as the start date. For me, that was Monday 24th July 1995.

Sending data in a signal

The well-known kill system call has been around for decades and is used to send a signal to another process. The most common use is to terminate or kill another process by sending the KILL or TERM signal but it can be used for a form of IPC, usually around giving the other process a “kick” to do something.

One thing that isn’t as well known is besides sending a signal to a process, you can send some data to it. This can either be an integer or a pointer and uses similar semantics to the known kill and signal handler. I came across this when there was a merge request for procps. The main changes are using sigqueue instead of kill in the sender and using a signal action not a signal handler in the receiver.

WordPress 5.4

Debian packages for WordPress version 5.4 will be uploaded shortly. I’m just going through the install testing now. One problem I have noticed is, at least for my setup, there is an issue with network updates. The problem is that WordPress will ask me if I want to update the network sites, I say yes

procps-ng 3.3.16

procps-ng version 3.3.16 was released today. Besides some documentation and library updates, there were a few incremental changes. Zombie Hunting with pgrep Ever wanted to find zombies? Perhaps processes with other states? pgrep has a shiny new runstate flag to help you which will match process against the runstate. I’m curious to see the use-cases

WordPress 5.2.4

Hot on the heels of WordPress version 5.2.3 which fixed a bunch of stuff we have WordPress 5.2.4 with fixes for six security issues. There is a certain trick to matching up what the WordPress Blog thinks has been fixed and the changsets between the old version and the new. The curious thing is there