8c220dc083
* Fix localization text, Intune capitalization, ADMX indentation, unused import - distributions/validate.py: Remove unused 'import base64' - en-US/en-GB Resources.resw: Fix word order 'the list distribution' -> 'the distribution list' in MessageCouldFetchDistributionList - en-US/en-GB Resources.resw: Remove trailing space from MessageCorruptedDistroRegistration value - intune/en-US/WSL.adml: Fix 'For Linux' -> 'for Linux' capitalization (5 occurrences) to match official product name - intune/WSL.admx: Fix inconsistent 3-space indent to 4-space on AllowWSL1 and CustomKernelUserSettingConfigurable policies * Fix grammar, typos, and formatting in docs and source code - WmiService.h: Fix duplicated word 'of of' -> 'is of' in WQL comment - drvfs.md: Fix 'which tell' -> 'which tells' (subject-verb agreement), double space, second 'tell' -> 'tells' - systemd.md: Fix 'tries synchronizes' -> 'tries to synchronize' - wslhost.exe.md: Fix 'processes terminates' -> 'process terminates' - boot-process.md: Add missing 'in' preposition, fix C:/ -> C:\, fix lowercase 'linux' to 'Linux' (4 occurrences), fix misplaced parenthesis - init.md: Fix double space before hvsocket backtick - session-leader.md: Fix heading level ## -> ### to match sibling section - CONTRIBUTING.md: Fix double period after bold security notice - debugging.md: Fix missing word 'be' in 'can enabled', fix 'process' -> 'processes' - index.md: Add missing period at end of sentence - technical-documentation/index.md: Fix 'API's' -> 'APIs' (remove incorrect apostrophe) - relay.md: Fix lowercase 'linux' to 'Linux' (3 occurrences) - localhost.md: Fix lowercase 'linux' to 'Linux' - plan9.md: Fix lowercase 'linux' to 'Linux' * update errormessages testcase --------- Co-authored-by: Ben Hillis <benhill@ntdev.microsoft.com>
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Plan 9
Plan9 is a Linux process that hosts a plan9 filesystem server for WSL1 and WSL2 distributions. It's created by init in each distribution.
WSL 1
In WSL1 distributions, plan9 serves its filesystem through a unix socket, which can then be connected to from Windows.
WSL2
In WSL2 distributions, plan9 runs its filesystem through an hvsocket
Accessing the distribution files from Windows
From Windows, a special redirector driver (p9rdr.sys) registers both \\wsl$ and \\wsl.localhost. When either of those paths are accessed, p9rdr.sys calls wslservice.exe to list the available distributions for a given Windows user.
When a distribution path is accessed (like \\wsl.localhost\debian), p9rdr.sys calls into wslservice.exe via COM to start the distribution, and connect to its plan9 server, which allows the files to be accessed from Windows.
See src/linux/init/plan9.cpp