Hi Thomas, On Mon, Nov 17, 2025 at 03:59:30PM +1300, Thomas Munro wrote: > On Tue, Nov 11, 2025 at 10:49 AM Michael Banck <[email protected]> wrote: > > |login: task ./test_signalhandler(767) looked up a bogus port 23 for3205, > > most probably a bug. > > . o O { An absurdly far-fetched thought while browsing glibc/hurd glue > code: if synchronous I/O is implemented as RPC on Mach ports, could > that mean that it's technically possible to submit now and consume > results later, for asynchronous I/O? Possibly too > private/undocumented anyway, and maybe they'll eventually do io_uring > or something... I idly wondered about driving I/O directly with ports > while studying the dismal implementation of POSIX AIO on macOS, which > also derives from CMU Mach, but NeXT/Apple jammed file systems down > into the unikernel part behind traditional syscalls, and it looks like > maybe only raw devices are accessible with ports. (I have dim > memories of learning C and assembler more than 30 years ago on a > Commodore Amiga whose microkernel nee Cambridge TRIPOS worked like > that... that cheap home computer could easily get both floppy drives > doing random I/O at once while computing other stuff, unlike Unix...) > }
I have CC'd Samuel Thibault who is the currently active Hurd committer/ maintainer, I hope he can comment on that. Michael
