WebAssembly Posts
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Extern Ref, Wasm and C / C++
I should subtitle this post as “That’s not a pointer… This is a Pointer!” . In the previous two posts I showed how to import and export functions between Wasm and the host environment. This seems pretty safe, but can open up an attack vector which
extern_refshuts down. Let’s check that out… -
Importing Host Functions for Wasm
In the last post I explained how compiled WebAssembly code could export functions which can then be invoked from the host, essentially using WebAssembly as a safe version of a shared object. But that’s only part of the story, at some point our WebAssembly code is going to want to call the host. Either to obtain a resource like a
fopenfunction call, or as some sort of notification. -
Embedding WebAssembly in Software
In most of the WebAssembly examples I’ve posted so far I’ve written simple, but complete applications, complete with a
mainfunction. But WebAssembly really comes into its own when you use it to embed third party code inside your application. -
ARM32 and WebAssembly on a Raspberry PI 1
Ok folks. It’s late in the evening and I set myself the challenge of getting WAMR working on a Raspberry PI1. Rather than just share the tips and tricks, I thought I’d share a bit of my log book, and late night random thoughts as I get things going. Maybe this will be amusing to read? Anyway, it might help me remember in the morning.
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WebAssembly and Signal Handling
You can think of signal’s like user space interrupts. Essentially the running application is interrupted, and a signal handler function is invoked. This function is passed some data to describe why it is being interrupted. Once the function is invoked it can process a response to this “signal”. You’ve probably seen this on Linux. Geeks for Geeks has a great description of Signals. They are effectively used to communicate some information to the running process, a common use case is sending a signal to notify a process that is about to be terminated, thus allowing it to clean up resources, closing file handles, etc.
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Mongoose and an Embedded WebServer in WAMR
It’s not unusual for your printer, or your fridge to have a small web server running. The embedded web server provides important control interfaces of these devices. It’s not just the fridge and the printer, but increasingly a large number of additional devices too, from milling machines on a shop floor, to smart pumps and electrical meters.
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Getting Started with Embedded WASM - Development Environment (WAMR)
We all know that WebAssembly is great for the Web, but it’s also incredibly powerful in the embedded space too. You can compile Go, Rust, C++ and other languages for device families that don’t have compiler of build tools which support these languages. That’s in addition to the sandboxed and portable nature of WebAssembly of course.