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The Mach APIs are available to userland applications, if you used a different kernel you’d have to implement them somehow

• ripdog 2mo ago
  But do real apps actually use them directly? Or only through the userland libraries? Just FYI, the https://www.darlinghq.org https://www.darlinghq.org project is doing MacOS app compat on Linux - i.e. building the userland libraries.
  • mrpippy 2mo ago
    Yes, real apps use Mach messaging directly. i.e.: https://source.chromium.org/chromium/chromium/src/+/main:ipc/mach_port_mac.h https://source.chromium.org/chromium/chromium/src/+/main:ipc...
    • ChocolateGod 2mo ago
      Chrome is an outlier to how most apps will do things.
      • nrr 2mo ago
        The illustration that Chrome uses Mach ports is a counterexample to an (implied) insinuation that nothing in running in macOS user space uses Mach ports. Outlier or not, the fact there is at least one (albeit also very useful and very popular) application that uses them ties back to the conversation about how they're a kernel feature worth having for Mac compatibility.
      • wpm 2mo ago
        Any launchd task that declares any MachServices does.