-# serial 31
+# serial 38
# See if we need to use our replacement for Solaris' openat et al functions.
dnl Copyright (C) 2004-2011 Free Software Foundation, Inc.
GNULIB_MKDIRAT=1
AC_REQUIRE([gl_UNISTD_H_DEFAULTS])
- GNULIB_FCHOWNAT=1
GNULIB_UNLINKAT=1
- AC_LIBOBJ([openat-proc])
AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS])
- AC_CHECK_FUNCS_ONCE([lchmod])
- AC_REPLACE_FUNCS([fchmodat fstatat mkdirat openat unlinkat])
- AC_REQUIRE([AC_FUNC_LSTAT_FOLLOWS_SLASHED_SYMLINK])
+ AC_CHECK_FUNCS_ONCE([fchmodat lchmod mkdirat openat unlinkat])
+ AC_REQUIRE([gl_FUNC_LSTAT_FOLLOWS_SLASHED_SYMLINK])
AC_REQUIRE([gl_FUNC_UNLINK])
- case $ac_cv_func_openat+$ac_cv_func_lstat_dereferences_slashed_symlink in
+ case $ac_cv_func_openat+$gl_cv_func_lstat_dereferences_slashed_symlink in
yes+yes)
# GNU/Hurd has unlinkat, but it has the same bug as unlink.
if test $REPLACE_UNLINK = 1; then
- AC_LIBOBJ([unlinkat])
REPLACE_UNLINKAT=1
fi ;;
yes+*)
# Solaris 9 has *at functions, but uniformly mishandles trailing
# slash in all of them.
- AC_LIBOBJ([openat])
REPLACE_OPENAT=1
- AC_LIBOBJ([fstatat])
- REPLACE_FSTATAT=1
- AC_LIBOBJ([unlinkat])
REPLACE_UNLINKAT=1
;;
*)
HAVE_OPENAT=0
HAVE_UNLINKAT=0 # No known system with unlinkat but not openat
- HAVE_FSTATAT=0 # No known system with fstatat but not openat
gl_PREREQ_OPENAT;;
esac
if test $ac_cv_func_fchmodat != yes; then
if test $ac_cv_func_mkdirat != yes; then
HAVE_MKDIRAT=0
fi
- gl_FUNC_FCHOWNAT
-])
-
-# gl_FUNC_FCHOWNAT_DEREF_BUG([ACTION-IF-BUGGY[, ACTION-IF-NOT_BUGGY]])
-AC_DEFUN([gl_FUNC_FCHOWNAT_DEREF_BUG],
-[
- dnl Persuade glibc's <unistd.h> to declare fchownat().
- AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS])
+ gl_FUNC_FSTATAT
- AC_CACHE_CHECK([whether fchownat works with AT_SYMLINK_NOFOLLOW],
- gl_cv_func_fchownat_nofollow_works,
- [
- gl_dangle=conftest.dangle
- # Remove any remnants of a previous test.
- rm -f $gl_dangle
- # Arrange for deletion of the temporary file this test creates.
- ac_clean_files="$ac_clean_files $gl_dangle"
- ln -s conftest.no-such $gl_dangle
- AC_RUN_IFELSE(
- [AC_LANG_SOURCE(
- [[
-#include <fcntl.h>
-#include <unistd.h>
-#include <stdlib.h>
-#include <errno.h>
-#include <sys/types.h>
-int
-main ()
-{
- return (fchownat (AT_FDCWD, "$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], [$2])
+ dnl This is tested at least via getcwd.c.
+ gl_MODULE_INDICATOR([openat])
])
-# gl_FUNC_FCHOWNAT_EMPTY_FILENAME_BUG([ACTION-IF-BUGGY[, ACTION-IF-NOT_BUGGY]])
-AC_DEFUN([gl_FUNC_FCHOWNAT_EMPTY_FILENAME_BUG],
+# If we have the fstatat function, and it has the bug (in AIX 7.1)
+# that it does not fill in st_size correctly, use the replacement function.
+AC_DEFUN([gl_FUNC_FSTATAT],
[
- dnl Persuade glibc's <unistd.h> to declare fchownat().
+ AC_REQUIRE([gl_SYS_STAT_H_DEFAULTS])
AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS])
+ AC_REQUIRE([gl_FUNC_LSTAT_FOLLOWS_SLASHED_SYMLINK])
+ AC_CHECK_FUNCS_ONCE([fstatat])
- AC_CACHE_CHECK([whether fchownat works with an empty file name],
- [gl_cv_func_fchownat_empty_filename_works],
- [AC_RUN_IFELSE(
- [AC_LANG_PROGRAM(
- [[#include <unistd.h>
- #include <fcntl.h>
- ]],
- [[int fd;
- int ret;
- if (mkdir ("conftestdir", 0700) < 0)
- return 2;
- fd = open ("conftestdir", O_RDONLY);
- if (fd < 0)
- return 3;
- ret = fchownat (fd, "", -1, -1, 0);
- close (fd);
- rmdir ("conftestdir");
- return ret == 0;
- ]])],
- [gl_cv_func_fchownat_empty_filename_works=yes],
- [gl_cv_func_fchownat_empty_filename_works=no],
- [gl_cv_func_fchownat_empty_filename_works="guessing no"])
- ])
- AS_IF([test "$gl_cv_func_fchownat_empty_filename_works" != yes], [$1], [$2])
-])
+ if test $ac_cv_func_fstatat = no; then
+ HAVE_FSTATAT=0
+ else
+ dnl Test for an AIX 7.1 bug; see
+ dnl <http://lists.gnu.org/archive/html/bug-tar/2011-09/msg00015.html>.
+ AC_CACHE_CHECK([whether fstatat (..., 0) works],
+ [gl_cv_func_fstatat_zero_flag],
+ [gl_cv_func_fstatat_zero_flag=no
+ AC_RUN_IFELSE(
+ [AC_LANG_SOURCE(
+ [[
+ #include <fcntl.h>
+ #include <sys/stat.h>
+ int
+ main (void)
+ {
+ struct stat a;
+ return fstatat (AT_FDCWD, ".", &a, 0) != 0;
+ }
+ ]])],
+ [gl_cv_func_fstatat_zero_flag=yes])])
-# If we have the fchownat function, and it has the bug (in glibc-2.4)
-# that it dereferences symlinks even with AT_SYMLINK_NOFOLLOW, then
-# use the replacement function.
-# Also if the fchownat function, like chown, has the trailing slash bug,
-# use the replacement function.
-# Also use the replacement function if fchownat is simply not available.
-AC_DEFUN([gl_FUNC_FCHOWNAT],
-[
- AC_REQUIRE([gl_UNISTD_H_DEFAULTS])
- AC_REQUIRE([gl_FUNC_CHOWN])
- AC_CHECK_FUNC([fchownat],
- [gl_FUNC_FCHOWNAT_DEREF_BUG(
- [REPLACE_FCHOWNAT=1
- AC_DEFINE([FCHOWNAT_NOFOLLOW_BUG], [1],
- [Define to 1 if your platform has fchownat, but it cannot
- perform lchown tasks.])
- ])
- gl_FUNC_FCHOWNAT_EMPTY_FILENAME_BUG(
- [REPLACE_FCHOWNAT=1
- AC_DEFINE([FCHOWNAT_EMPTY_FILENAME_BUG], [1],
- [Define to 1 if your platform has fchownat, but it does
- not reject an empty file name.])
- ])
- if test $REPLACE_CHOWN = 1; then
- REPLACE_FCHOWNAT=1
- fi],
- [HAVE_FCHOWNAT=0])
- if test $HAVE_FCHOWNAT = 0 || test $REPLACE_FCHOWNAT = 1; then
- AC_LIBOBJ([fchownat])
+ case $gl_cv_func_fstatat_zero_flag+$gl_cv_func_lstat_dereferences_slashed_symlink in
+ yes+yes) ;;
+ *) REPLACE_FSTATAT=1
+ if test $gl_cv_func_fstatat_zero_flag != yes; then
+ AC_DEFINE([FSTATAT_ZERO_FLAG_BROKEN], [1],
+ [Define to 1 if fstatat (..., 0) does not work,
+ as in AIX 7.1.])
+ fi
+ ;;
+ esac
fi
])
projects / gnulib.git / blobdiff