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gh-153711: Test availability for dup3() and pipe2() on iOS #155222

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gh-153711: Test availability for dup3() and pipe2() on iOS #155222

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e9a3acd
gh-153711: Test availability for dup3() and pipe2() on iOS
encukou Aug 5, 2026
001df7d
Fix configure
encukou Aug 5, 2026
0378698
Merge branch 'main' into dup3-pipe2-ios
freakboy3742 Oct 4, 2026
70ae8ab
Use a different autoconf test for dup3/pipe2.
freakboy3742 Oct 5, 2026
5e703b2
Re-configure pyconfig.h.in
freakboy3742 Oct 5, 2026
082c16e
Narrow test to skip dup3 and pipe2 for iOS 26 and earlier
ned-deily Oct 8, 2026
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2 changes: 1 addition & 1 deletion Doc/library/os.rst
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Original file line number Diff line number Diff line change
Expand Up @@ -1479,7 +1479,7 @@ or `the MSDN <https://msdn.microsoft.com/en-us/library/z0kc8e3z.aspx>`_ on Windo
Return a pair of file descriptors ``(r, w)`` usable for reading and writing,
respectively.

.. availability:: Unix, macOS >= 27.0, not WASI, not iOS.
.. availability:: Unix, macOS >= 27.0, iOS >= 27.0, not WASI.

.. versionadded:: 3.3

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3 changes: 3 additions & 0 deletions Misc/NEWS.d/next/Library/2026-08-05-10-13-23.gh-issue-153711.9g9dVz.rst
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@@ -0,0 +1,3 @@
On iOS, add :func:`os.pipe2`, and use the syscalls :manpage:`pipe2 (2)` and
:manpage:`dup3 (2)` internally, when available at both build-time and
run-time.
4 changes: 2 additions & 2 deletions Modules/posixmodule.c
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Expand Up @@ -512,8 +512,8 @@ static const unsigned int _Py_STATX_KNOWN = (STATX_BASIC_STATS | STATX_BTIME
# define HAVE_MKFIFOAT_RUNTIME __builtin_available(macOS 13.0, iOS 16.0, tvOS 16.0, watchOS 9.0, *)
# define HAVE_MKNODAT_RUNTIME __builtin_available(macOS 13.0, iOS 16.0, tvOS 16.0, watchOS 9.0, *)
# define HAVE_PTSNAME_R_RUNTIME __builtin_available(macOS 10.13.4, iOS 11.3, tvOS 11.3, watchOS 4.3, *)
# define HAVE_DUP3_RUNTIME __builtin_available(macOS 27.0, *)
# define HAVE_PIPE2_RUNTIME __builtin_available(macOS 27.0, *)
# define HAVE_DUP3_RUNTIME __builtin_available(macOS 27.0, iOS 27.0, tvOS 27.0, watchOS 27.0, visionOS 27.0, *)
# define HAVE_PIPE2_RUNTIME __builtin_available(macOS 27.0, iOS 27.0, tvOS 27.0, watchOS 27.0, visionOS 27.0, *)

# define HAVE_POSIX_SPAWN_SETSID_RUNTIME __builtin_available(macOS 10.15, *)

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38 changes: 34 additions & 4 deletions configure
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23 changes: 19 additions & 4 deletions configure.ac
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Expand Up @@ -439,7 +439,7 @@ if test -z "$AR"; then
aarch64-apple-ios*) AR=arm64-apple-ios-ar ;;
x86_64-apple-ios*-simulator) AR=x86_64-apple-ios-simulator-ar ;;
*)
esac
esac
fi
if test -z "$CC"; then
case "$host" in
Expand Down Expand Up @@ -5576,9 +5576,24 @@ fi
# found by configure), but either raise a compilation error (because the
# header definition prevents usage - autoconf doesn't use the headers), or
# raise an error if used at runtime. Force these symbols off.
if test "$ac_sys_system" != "iOS" ; then
AC_CHECK_FUNCS([dup3 getentropy getgroups pipe2 system])
fi
# In particular, dup3 and pipe2 are available as of iOS 27 but were
# incorrectly detected in older simulator versions.
case "$ac_sys_system" in
iOS)
AC_MSG_CHECKING([if iOS SDK is older than 27])
ios_sdk_version=$(xcrun --sdk iphoneos --show-sdk-version 2>/dev/null | cut -d. -f1)
if test -n "$ios_sdk_version" && test "$ios_sdk_version" -ge 27; then
AC_MSG_RESULT([no])
AC_CHECK_FUNCS([dup3 pipe2])
else
AC_MSG_RESULT([yes])
fi
;;
*)
# not iOS
AC_CHECK_FUNCS([dup3 getentropy getgroups pipe2 system])
;;
esac

AC_CHECK_DECL([dirfd],
[AC_DEFINE([HAVE_DIRFD], [1],
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