readlinkat tests: EBADF tests.

* tests/test-readlinkat.c (main): Add tests for EBADF.

1 files changed, 12 insertions, 0 deletions

diff --git a/tests/test-readlinkat.c b/tests/test-readlinkat.c
index 1d588ac392..5685934a28 100644
--- a/tests/test-readlinkat.c
+++ b/tests/test-readlinkat.c
@@ -59,6 +59,18 @@ main (void)
   /* Remove any leftovers from a previous partial run.  */
   ignore_value (system ("rm -rf " BASE "*"));
 
+  /* Test behaviour for invalid file descriptors.  */
+  {
+    errno = 0;
+    ASSERT (readlinkat (-1, "foo", buf, sizeof buf) == -1);
+    ASSERT (errno == EBADF);
+  }
+  {
+    errno = 0;
+    ASSERT (readlinkat (99, "foo", buf, sizeof buf) == -1);
+    ASSERT (errno == EBADF);
+  }
+
   /* Perform same checks as counterpart functions.  */
   result = test_readlink (do_readlink, false);
   dfd = openat (AT_FDCWD, ".", O_RDONLY);