Hi Roman,
Nice to see your interest in Rust on Genode! I finally got around
looking into your experiments with Rocket.
I'm afraid there is no easy hotfix for your specific use case. I got
around your specific error by adding both Mio flags to cargo.tcl:
lappend rustflags --cfg mio_unsupported_force_poll_poll --cfg
mio_unsupported_force_waker_pipe
However down the road compilation failed anyway because the Tokio crate,
expecting a kqueue based Mio implementation on FreeBSD, uses AIO, which
fails with Mio's poll implementation. Your general approach was correct
though, as long as more granular config flag support[1] is not
available, there is no alternative to setting the cfg flag globally.
I'm aware that most certainly, there are other roadblocks ahead.
However, I'd like to pursue the topic regarding kqueue()/kevent() a bit
more since I assume this might be (or has been) a roadblock for porting
other applications or runtimes.
- Is it reasonable to add those calls to Genodes libc?
I absolutely agree that implementing support for kqueue()/kevent() in
Genode's libc port is the reasonable way forward and I also suspect that
future ports will likely benefit from its availability. I have looked
into potential stumbling blocks and sketched out a possible
implementation. I would be happy to implement at least basic support for
the common kevent filters used in Mio (EVFILT_READ, EVFILT_WRITE) and
defer implementing some of the more obscure ones. However, to make the
Tokio runtime work, it seems we will need to implement support for AIO
as well. I haven't really looked into AIO yet and I'm not sure how
difficult it will be to make this work, but with the widespread use of
Tokio, it will be a prerequisite for many complex Rust packages.
I much appreciate your experiments and if you want to take this further,
we do of course welcome contributions to our libc port. While I'm
looking forward to extending our Rust support, I'm currently working on
other road map milestones and may not get around to working on this
before the 24.04 Sculpt release.
Best wishes,
Ben
[1] https://github.com/rust-lang/cargo/issues/10271
--
Benjamin Lamowski
Genode Labs
https://www.genode-labs.com · https://genode.org
Genode Labs GmbH · Amtsgericht Dresden · HRB 28424 · Sitz Dresden
Geschäftsführer: Dr.-Ing. Norman Feske, Christian Helmuth
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