--- a/ChangeLog
+++ b/ChangeLog
@@ -1,5 +1,8 @@
 2011-09-20  Bruno Haible  <bruno@clisp.org>
 
+	linkat tests: EBADF tests.
+	* tests/test-linkat.c (main): Add tests for EBADF.
+
 	Tests for module 'faccessat'.
 	* modules/faccessat-tests: New file.
 	* tests/test-faccessat.c: New file.

--- a/tests/test-linkat.c
+++ b/tests/test-linkat.c
@@ -95,6 +95,29 @@
   /* Clean up any trash from prior testsuite runs.  */
   ignore_value (system ("rm -rf " BASE "*"));
 
+  /* Test behaviour for invalid file descriptors.  */
+  {
+    errno = 0;
+    ASSERT (linkat (-1, "foo", AT_FDCWD, "bar", 0) == -1);
+    ASSERT (errno == EBADF);
+  }
+  {
+    errno = 0;
+    ASSERT (linkat (99, "foo", AT_FDCWD, "bar", 0) == -1);
+    ASSERT (errno == EBADF);
+  }
+  ASSERT (close (creat (BASE "oo", 0600)) == 0);
+  {
+    errno = 0;
+    ASSERT (linkat (AT_FDCWD, BASE "oo", -1, "bar", 0) == -1);
+    ASSERT (errno == EBADF);
+  }
+  {
+    errno = 0;
+    ASSERT (linkat (AT_FDCWD, BASE "oo", 99, "bar", 0) == -1);
+    ASSERT (errno == EBADF);
+  }
+
   /* Test basic link functionality, without mentioning symlinks.  */
   result = test_link (do_link, true);
   dfd1 = open (".", O_RDONLY);