New module 'fchownat', split off from module 'openat'.

* lib/openat.h (chownat, lchownat): Enable only if GNULIB_FCHOWNAT is
defined.
* m4/fchownat.m4: New file, extracted from m4/openat.m4.
* m4/openat.m4 (gl_FUNC_OPENAT): Don't set GNULIB_FCHOWNAT. Don't
invoke gl_FUNC_FCHOWNAT.
(gl_FUNC_FCHOWNAT_DEREF_BUG, gl_FUNC_FCHOWNAT_EMPTY_FILENAME_BUG,
gl_FUNC_FCHOWNAT): Moved to m4/fchownat.m4.
* modules/fchownat: New file, extracted from modules/openat.
* modules/openat (Files): Remove lib/fchownat.c.
(Depends-on): Remove lchown.
(configure.ac): Remove AC_LIBOBJ of fchownat.
* modules/fchownat-tests: New file, extracted from modules/openat-tests.
* modules/openat-tests (Files): Remove tests/test-fchownat.c,
tests/test-chown.h, tests/test-lchown.h, tests/nap.h.
(Depends-on): Remove mgetgroups, usleep, stat-time.
(configure.ac): Remove test for getegid.
(Makefile.am): Remove rules for test-fchownat.
* doc/posix-functions/fchownat.texi: Mention module 'fchownat' instead
of module 'openat'.
* NEWS: Mention the change.

1 files changed, 1 insertions, 103 deletions

diff --git a/m4/openat.m4 b/m4/openat.m4
index 05a6bd30c2..1886d0b6d6 100644
--- a/m4/openat.m4
+++ b/m4/openat.m4
@@ -1,4 +1,4 @@
-# serial 37
+# 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.
@@ -19,7 +19,6 @@ AC_DEFUN([gl_FUNC_OPENAT],
   GNULIB_MKDIRAT=1
 
   AC_REQUIRE([gl_UNISTD_H_DEFAULTS])
-  GNULIB_FCHOWNAT=1
   GNULIB_UNLINKAT=1
 
   AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS])
@@ -49,113 +48,12 @@ AC_DEFUN([gl_FUNC_OPENAT],
   if test $ac_cv_func_mkdirat != yes; then
     HAVE_MKDIRAT=0
   fi
-  gl_FUNC_FCHOWNAT
   gl_FUNC_FSTATAT
 
   dnl This is tested at least via getcwd.c.
   gl_MODULE_INDICATOR([openat])
 ])
 
-# 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])
-
-  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], [$2])
-])
-
-# gl_FUNC_FCHOWNAT_EMPTY_FILENAME_BUG([ACTION-IF-BUGGY[, ACTION-IF-NOT_BUGGY]])
-AC_DEFUN([gl_FUNC_FCHOWNAT_EMPTY_FILENAME_BUG],
-[
-  dnl Persuade glibc's <unistd.h> to declare fchownat().
-  AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS])
-
-  AC_CACHE_CHECK([whether fchownat works with an empty file name],
-    [gl_cv_func_fchownat_empty_filename_works],
-    [AC_RUN_IFELSE(
-       [AC_LANG_PROGRAM(
-          [[#include <unistd.h>
-            #include <fcntl.h>
-          ]],
-          [[int fd;
-            int ret;
-            if (mkdir ("conftestdir", 0700) < 0)
-              return 2;
-            fd = open ("conftestdir", O_RDONLY);
-            if (fd < 0)
-              return 3;
-            ret = fchownat (fd, "", -1, -1, 0);
-            close (fd);
-            rmdir ("conftestdir");
-            return ret == 0;
-          ]])],
-       [gl_cv_func_fchownat_empty_filename_works=yes],
-       [gl_cv_func_fchownat_empty_filename_works=no],
-       [gl_cv_func_fchownat_empty_filename_works="guessing no"])
-    ])
-  AS_IF([test "$gl_cv_func_fchownat_empty_filename_works" != yes], [$1], [$2])
-])
-
-# If 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 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],