--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,9 @@
+2011-09-18  Bruno Haible  <bruno@clisp.org>
+
+	Tests for module 'accept4'.
+	* modules/accept4-tests: New file.
+	* tests/test-accept4.c: New file.
+
 2011-09-18  Bruno Haible  <bruno@clisp.org>
 
 	Tests for module 'accept'.

new file mode 100644
--- /dev/null
+++ b/modules/accept4-tests
@@ -0,0 +1,15 @@
+Files:
+tests/test-accept4.c
+tests/signature.h
+tests/macros.h
+
+Depends-on:
+fcntl-h
+netinet_in
+binary-io
+
+configure.ac:
+
+Makefile.am:
+TESTS += test-accept4
+check_PROGRAMS += test-accept4

new file mode 100644
--- /dev/null
+++ b/tests/test-accept4.c
@@ -0,0 +1,58 @@
+/* Test accepting a connection to a server socket.
+   Copyright (C) 2011 Free Software Foundation, Inc.
+
+   This program is free software: you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; either version 3 of the License, or
+   (at your option) any later version.
+
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
+
+#include <config.h>
+
+#include <sys/socket.h>
+
+#include "signature.h"
+SIGNATURE_CHECK (accept4, int, (int, struct sockaddr *, socklen_t *, int));
+
+#include <errno.h>
+#include <fcntl.h>
+#include <netinet/in.h>
+
+#include "binary-io.h"
+
+#include "macros.h"
+
+int
+main (void)
+{
+  /* Test behaviour for invalid file descriptors.  */
+  {
+    struct sockaddr_in addr;
+    socklen_t addrlen = sizeof (addr);
+
+    errno = 0;
+    ASSERT (accept4 (-1, (struct sockaddr *) &addr, &addrlen,
+                     O_CLOEXEC | O_BINARY)
+            == -1);
+    ASSERT (errno == EBADF);
+  }
+  {
+    struct sockaddr_in addr;
+    socklen_t addrlen = sizeof (addr);
+
+    errno = 0;
+    ASSERT (accept4 (99, (struct sockaddr *) &addr, &addrlen,
+                     O_CLOEXEC | O_BINARY)
+            == -1);
+    ASSERT (errno == EBADF);
+  }
+
+  return 0;
+}