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Windows NT was also originally implemented with translation layers for OS/2 and POSIX. The WSL is a revival of the POSIX layer. "Broad software compatibility

by chasil 6y ago

Windows NT was also originally implemented with translation layers for OS/2 and POSIX. The WSL is a revival of the POSIX layer. "Broad software compatibility was initially achieved with support for several API "personalities", including Windows API, POSIX, and OS/2 APIs – the latter two were phased out starting with Windows XP." https://en.wikipedia.org/wiki/Windows_NT https://en.wikipedia.org/wiki/Windows_NT

skissane 6y ago
> The WSL is a revival of the POSIX layer. Even WSL1 is technically very different from the old POSIX layer. The old POSIX layer used classic NT processes and POSIX APIs were routed in user space to NT syscalls via ntdll. WSL1 uses lightweight picoprocesses and implements the Linux syscall API in-kernel, rather than doing POSIX API to NT syscall mapping in user-space. Windows NT POSIX (and Interix/SFU/SUA) are conceptually much closer to Cygwin than to WSL1.
- jsmith45 6y ago
  Yeah, the POSIX subsystem on Windows is mostly the same concept as the POSIX LITE that is mentioned in the Fuchsia document.