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[3.13] gh-153711: Avoid use of dup3 and pipe2 calls introduced in macOS 27 #155211

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ned-deily merged 2 commits into from
Aug 5, 2026
+29 −14
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[3.13] gh-153711: Avoid use of dup3 and pipe2 calls introduced in macOS 27 #155211

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c2e0db4
gh-153711: Avoid use of dup3 and pipe2 calls introduced in macOS 27
ned-deily Aug 5, 2026
5ab6164
Fix hasty typos
ned-deily Aug 5, 2026
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3 changes: 3 additions & 0 deletions Misc/NEWS.d/next/macOS/2026-08-05-02-02-33.gh-issue-153711.pO9fFb.rst
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Original file line number Diff line number Diff line change
@@ -0,0 +1,3 @@
On macOS, do not attempt to use the :manpage:`dup3(2)` and
:manpage:`pipe2(2)` system calls introduced in
macOS 27 to prevent problems when running on older systems.
32 changes: 19 additions & 13 deletions configure
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8 changes: 7 additions & 1 deletion configure.ac
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Original file line number Diff line number Diff line change
Expand Up @@ -5282,7 +5282,13 @@ fi
# header definition prevents usage - autoconf doesn't use the headers), or
# raise an error if used at runtime. Force these symbols off.
if test "$ac_sys_system" != "iOS" ; then
AC_CHECK_FUNCS([dup3 getentropy getgroups pipe2 system])
AC_CHECK_FUNCS([getentropy getgroups system])
fi
# In addition, macOS introduced dup3 and pipe2 in macOS 27, late in the
# lifetime of this version of Python. Rather than adding weaklinking
# support for them, just continue to ignore them.
if test "$ac_sys_system" != "iOS" -a "$ac_sys_system" != "Darwin"; then
AC_CHECK_FUNCS([dup3 pipe2])
fi

AC_CHECK_DECL([dirfd],
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