Unverified50% confidenceFactExact time
XNU's BSD subsystem derives directly from FreeBSD, providing POSIX system calls, the process model and the network stack.
1
Sources
50%
Confidence
Long-term
Relevance
10/22/2026
First Seen
Sources
macOS Is No Longer UNIX: Apple Didn't Renew Certification, But the Technology Is Unchanged
youtubeThe Lunduke Journal10/22/2026
Related Entities
Related Claims
UnverifiedmacOS long held POSIX certification, and its BSD-derived toolchain and XNU kernel provide POSIX-compliant interfaces, so even after losing the UNIX trademark it remains a POSIX-compatible system.66% similarUnverifiedXZ Utils 的核心组件 liblzma 被 systemd 间接调用，进而影响 OpenSSH 的认证流程60% similarUnverifiedBSDun is an open-source project whose goal is to add native support for FreeBSD ELF binaries to the Linux kernel, allowing FreeBSD programs to run on the Linux kernel without recompilation.59% similarUnverifiedxtty is a native terminal application built specifically for macOS, positioned around everyday SSH and coding agent workflows rather than replacing all-in-one terminals such as iTerm2 or Warp.58% similarUnverifiedThe system call number for the open syscall is 2 on Linux x86-64, while it is 5 on FreeBSD.58% similar
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