8000 gh-90473: Decrease recursion limit and skip tests on WASI (GH-92803) by tiran · Pull Request #92803 · python/cpython · GitHub
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Merged
merged 7 commits into from
May 19, 2022
Merged

gh-90473: Decrease recursion limit and skip tests on WASI (GH-92803) #92803

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1f769f6
gh-90473: Decrease recursion limit and skip tests on WASI
tiran May 14, 2022
61c6f26
mkfifo and mknod aren't working either
tiran May 17, 2022
9d6a9e9
Reduce parser stack size on WASI
tiran May 18, 2022
f05c396
Document WASI restrictions
tiran May 18, 2022
3b6ca17
fix typo
tiran May 18, 2022
e67eab4
Define nest count in relation to recursion limit
tiran May 18, 2022
bd02948
chmod() won't fix a missing file
tiran May 18, 2022
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Document WASI restrictions
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@tiran
tiran committed May 18, 2022
commit f05c396b56ad9a8c6fb17257674be77960e72ff6
21 changes: 19 additions & 2 deletions Tools/wasm/README.md
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Expand Up @@ -220,10 +220,27 @@ AddType application/wasm wasm

# WASI (wasm32-wasi)

WASI builds require [WASI SDK](https://github.com/WebAssembly/wasi-sdk) and
currently [wasix](https://github.com/singlestore-labs/wasix) for POSIX
WASI builds require [WASI SDK](https://github.com/WebAssembly/wasi-sdk) 15.0+
and currently [wasix](https://github.com/singlestore-labs/wasix) for POSIX
compatibility stubs.

## WASI limitations and issues (WASI SDK 15.0)

A lot of Emscripten limitations also apply to WASI. Noticable restrictions
are:

- Call stack size is limited. Default recursion limit and parser stack size
are smaller than in regular Python builds.
- ``socket(2)`` cannot create new socket file descriptors. WASI programs can
call read/write/accept on a file descriptor that is passed into the process.
- ``socket.gethostname()`` and host name resolution APIs like
``socket.gethostbyname()`` are not implemented and always fail.
- ``chmod(2)`` is not available. It's not possible to modify file permissions,
yet. A future version of WASI may provide a limited ``set_permissions`` API.
- File locking (``fcntl``) is not available.
- ``os.pipe()``, ``os.mkfifo()``, and ``os.mknod()`` are not supported.


# Detect WebAssembly builds

## Python code
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0