[OpenIndiana-discuss] btop illumos/OpenIndiana port — PR up, looking for testers

[Alex Gorouvein]

Hi all,

Following up on my XFCE 4.20 build thread from a while back — I've since
ported btop (the resource monitor, https://github.com/aristocratos/btop) to
illumos/OpenIndiana. There was no illumos backend before this, so it's a
new src/openindiana/btop_collect.cpp built from the FreeBSD backend as a
starting template.

What's working:
- CPU stats and load averages via kstat (cpu_stat)
- Memory, including ZFS ARC accounting, via kstat + native swapctl(2)
- Filesystem/disk enumeration via getmntent(3C), disk I/O via kstat_io_t
- Network throughput via kstat (module "link", class "net")
- Full process list via /proc/<pid>/psinfo enumeration (no kvm_* calls)

Known limitations, documented upfront in the PR:
- ZFS disk I/O isn't attributable per-dataset; it's all aggregated to the
root mountpoint
- Process command lines truncate around 80 characters (illumos's PRARGSZ
limit on psinfo_t)
- CPU temperature, frequency, and battery reporting are stubbed, not
implemented

PR is here: https://github.com/aristocratos/btop/pull/1845 — 41/41 CI
checks passing, currently awaiting review/merge upstream. Development and
testing so far has been in a VirtualBox VM (OpenIndiana Hipster 2026.04,
GCC 14.3.0); I'm now working on a bare-metal test on an old Acer Aspire V5
laptop to shake out anything a VM wouldn't surface.

If anyone wants to try it before it's merged, you can build the branch
directly:

git clone https://github.com/agorouvein-rgb/btop.git
cd btop
git checkout openindiana-support
make PLATFORM=SunOS
sudo make install

(Needs an illumos-family OS with GCC 14+ and C++23 support.)

Would appreciate any testing, feedback, or review — especially on
hardware/configurations different from mine. Happy to answer questions
about the port itself too.

Thanks,
Alex