From: Brett Cannon <brett@python.org>
Date: Sat, 2 Mar 2024 00:52:12 +0000 (-0800)
Subject: GH-115978: Disable `*readv()` and `*writev()` on WASI (GH-116228)
X-Git-Tag: v3.13.0a5~139
X-Git-Url: http://git.ipfire.org/gitweb.cgi?a=commitdiff_plain;h=5dc8c84d397110f9edfa56793ad8887b1f176d79;p=thirdparty%2FPython%2Fcpython.git

GH-115978: Disable `*readv()` and `*writev()` on WASI (GH-116228)

Wasmtime doesn't implement these functions in a way to pass test_posix (https://github.com/bytecodealliance/wasmtime/issues/7830).
---

diff --git a/Misc/NEWS.d/next/Library/2024-03-01-14-22-08.gh-issue-115978.r2ePTo.rst b/Misc/NEWS.d/next/Library/2024-03-01-14-22-08.gh-issue-115978.r2ePTo.rst
new file mode 100644
index 000000000000..2adac31ac6c2
--- /dev/null
+++ b/Misc/NEWS.d/next/Library/2024-03-01-14-22-08.gh-issue-115978.r2ePTo.rst
@@ -0,0 +1,4 @@
+Disable preadv(), readv(), pwritev(), and writev() on WASI.
+
+Under wasmtime for WASI 0.2, these functions don't pass test_posix
+(https://github.com/bytecodealliance/wasmtime/issues/7830).
diff --git a/Tools/wasm/config.site-wasm32-wasi b/Tools/wasm/config.site-wasm32-wasi
index 5e98775400f6..4a1a466a4ab3 100644
--- a/Tools/wasm/config.site-wasm32-wasi
+++ b/Tools/wasm/config.site-wasm32-wasi
@@ -40,3 +40,12 @@ ac_cv_header_netpacket_packet_h=no
 
 # Disable int-conversion for wask-sdk as it triggers an error from version 17.
 ac_cv_disable_int_conversion=yes
+
+# preadv(), readv(), pwritev(), and writev() under wasmtime's WASI 0.2 support
+# do not use more than the first buffer provided, failing under test_posix.
+# Since wasmtime will not be changing this behaviour, disable the functions.
+# https://github.com/bytecodealliance/wasmtime/issues/7830
+ac_cv_func_preadv=no
+ac_cv_func_readv=no
+ac_cv_func_pwritev=no
+ac_cv_func_writev=no