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Note the (2004). Some things were removed/added/changed (/initrd, /sys, several things in /usr). Check <https://linux.die.net/man/7/hier> for an up-to-date resource.

> openbsd does not use a /boot/ partition. instead it uses the bsd.* files in root.

So there’s no equivalent to EFISTUB (the kernel as a UEFI executable, most easily accomplished by mounting the ESP at /boot)?

The /proc equivalent in OpenBSD is ptrace(2).

Could you elaborate? To me there seems extremely little overlap there (I'm familiar with both the procfs and linux's ptrace APIs, but not OpenBSD's ptrace).

Ptrace could an equivalent of what /proc was originally supposed to be, before it got repurposed for a bunch of sysctl-like purposes.

Interesting. I didn't know much about /proc's original design intent, and Wikipedia indeed says "the design of procfs aimed to replace the ptrace system call used for process tracing", citing https://lucasvr.gobolinux.org/etc/Killian84-Procfs-USENIX.pd... ("Processes as Files", USENIX 1984)