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build: auto-detect the presence of the openat2() syscall

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Let configure detect if the openat2() syscall is supported by the kernel
headers we are building against. Do not attempt to use openat2() if
support is not present.

Users can still disable using the openat2() syscall manually if so
desired.

Signed-off-by: Markus Mayer <mmayer@broadcom.com>
This commit is contained in:
Markus Mayer
2026-05-27 17:44:37 -07:00
committed by Andrew Tridgell
parent 09656e19c1
commit c73e0063b7
1 changed files with 13 additions and 4 deletions
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17
configure.ac
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@@ -103,10 +103,6 @@ dnl (and coverage-counted) without needing a pre-5.6 kernel. Behaviour-neutral
dnl by default (the knob only REMOVES a tier when explicitly disabled). dnl by default (the knob only REMOVES a tier when explicitly disabled).
AC_ARG_ENABLE(openat2, AC_ARG_ENABLE(openat2,
AS_HELP_STRING([--disable-openat2],[do not use Linux openat2(RESOLVE_BENEATH); force the portable resolver (for exercising the fallback tier)])) AS_HELP_STRING([--disable-openat2],[do not use Linux openat2(RESOLVE_BENEATH); force the portable resolver (for exercising the fallback tier)]))
if test x"$enable_openat2" != x"no"; then
AC_DEFINE([HAVE_OPENAT2], 1,
[Define to use Linux openat2(RESOLVE_BENEATH) in secure_relative_open where available.])
fi
AC_MSG_CHECKING([if md2man can create manpages]) AC_MSG_CHECKING([if md2man can create manpages])
if test x"$ac_cv_path_PYTHON3" = x; then if test x"$ac_cv_path_PYTHON3" = x; then
@@ -357,6 +353,19 @@ AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[ ]], [[return 0;]])],
CFLAGS="$OLD_CFLAGS" CFLAGS="$OLD_CFLAGS"
AC_SUBST(NOEXECSTACK) AC_SUBST(NOEXECSTACK)
AC_CACHE_CHECK([for openat2],rsync_cv_HAVE_OPENAT2,[
AC_COMPILE_IFELSE([
AC_LANG_PROGRAM([[#include <sys/syscall.h>]], [[int i = SYS_openat2]])
],
[rsync_cv_HAVE_OPENAT2=yes], [rsync_cv_HAVE_OPENAT2=no])
])
if test x"$enable_openat2" != x"no"; then
if test x"$rsync_cv_HAVE_OPENAT2" = x"yes"; then
AC_DEFINE([HAVE_OPENAT2], 1,
[Define to use Linux openat2(RESOLVE_BENEATH) in secure_relative_open where available.])
fi
fi
# arrgh. libc in some old debian version screwed up the largefile # arrgh. libc in some old debian version screwed up the largefile
# stuff, getting byte range locking wrong # stuff, getting byte range locking wrong
AC_CACHE_CHECK([for broken largefile support],rsync_cv_HAVE_BROKEN_LARGEFILE,[ AC_CACHE_CHECK([for broken largefile support],rsync_cv_HAVE_BROKEN_LARGEFILE,[