AC_DEFUN([gl_FUNC_OPENAT],
[
AC_LIBOBJ([openat-proc])
AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS])
AC_CHECK_FUNCS_ONCE([lchmod])
AC_CHECK_FUNCS_ONCE([fdopendir])
AC_REPLACE_FUNCS([fchmodat mkdirat openat])
case $ac_cv_func_openat+$ac_cv_func_lstat_dereferences_slashed_symlink in
yes+yes) ;;
yes+*) AC_LIBOBJ([fstatat]);;
*)
AC_DEFINE([__OPENAT_PREFIX], [[rpl_]],
[Define to rpl_ if the openat replacement function should be used.])
gl_PREREQ_OPENAT;;
esac
gl_FUNC_FCHOWNAT
])
AC_DEFUN([gl_FUNC_FCHOWNAT_DEREF_BUG],
[
AC_CACHE_CHECK([whether fchownat works with AT_SYMLINK_NOFOLLOW],
gl_cv_func_fchownat_nofollow_works,
[
gl_dangle=conftest.dangle
rm -f $gl_dangle
ac_clean_files="$ac_clean_files $gl_dangle"
ln -s conftest.no-such $gl_dangle
AC_RUN_IFELSE(
[AC_LANG_SOURCE(
[[
int
main ()
{
return (fchownat (AT_FDCWD, "$gl_dangle", -1, getgid (),
AT_SYMLINK_NOFOLLOW) != 0
&& errno == ENOENT);
}
]])],
[gl_cv_func_fchownat_nofollow_works=yes],
[gl_cv_func_fchownat_nofollow_works=no],
[gl_cv_func_fchownat_nofollow_works=no],
)
])
AS_IF([test $gl_cv_func_fchownat_nofollow_works = no], [$1], [$2])
])
AC_DEFUN([gl_FUNC_FCHOWNAT],
[
use_replacement_fchownat=yes
AC_CHECK_FUNC([fchownat], [have_fchownat=yes], [have_fchownat=no])
if test $have_fchownat = yes; then
gl_FUNC_FCHOWNAT_DEREF_BUG([], [use_replacement_fchownat=no])
fi
if test $use_replacement_fchownat = yes; then
AC_LIBOBJ(fchownat)
AC_DEFINE(fchownat, rpl_fchownat,
[Define to rpl_fchownat if the replacement function should be used.])
fi
])
AC_DEFUN([gl_PREREQ_OPENAT],
[
:
])