Extend Platform

This part describes documents for extending platforms. To extend a platform, implement hooks for it. Here’s a list of hooks you should implement:

current

This function prints a timestamp used for measuring time. A reliable source is system uptime. It’s better to make the format look like 1168719.16, to provide a better visual experience.

And what it outputs is up to you. You can even make it print a PID if you want.

If you don’t implement these hooks, you can’t use the following builtins:

builtin	relies on
log	current

You can place hooks anywhere. Just make sure builtins can see those hooks before calling them.

In practice, people place hook implementations in linux/libkit.sh and source posix/libkit.sh. This setup works on every Unix-like OS.