Anonymous state variables in emacs lisp

Asynchronous programming typically involves the use of context-local state variables, e.g., threads can use thread-local storage. In my consult-dash emacs package, results from multiple searches were collected into a single state variable for further processing. The state variable would have been created on the heap in languages such as C, and a reference passed along to any asynchronous calls, typically via a void pointer in C. Each invocation of the asynchronous procedure would create a new anonymous state, which should then be destroyed by the consumer of the result of the asynchronous procedure.

Building Lucas Chess on Fedora

Building Lucas Chess from source on Fedora 35+ is fairly straightforward, but requires a couple of minor tweaks. The sources themselves, not the binaries, can be found on github; the linux binaries are built using Docker for Debian, but most of the dependencies are present in the Fedora repositories.

Consult interface for dash-docs

A consult interface for a command is the usage of consult--read for completing read. This post is a list of issues encountered in the initial development of consult-dash.

VyOS interface firewall zone setup checklist

Adding a new interface to an existing VyOS instance will typically require adding firewall rules for that interface. Here's a checklist:

Multicast routing debugging

Setting up multicast reception on Fedora 34 requires using firewall-cmd to allow multicast traffic through firewalld via rich rules. The following is a description of a debugging session (or two) that helped identify the problem.