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diff --git a/tests/test-cloexec.c b/tests/test-cloexec.c
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+/* Test duplicating non-inheritable file descriptors.
+ Copyright (C) 2009-2022 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 <https://www.gnu.org/licenses/>. */
+
+/* Written by Eric Blake <ebb9@byu.net>, 2009. */
+
+#include <config.h>
+
+#include "cloexec.h"
+
+#include <errno.h>
+#include <fcntl.h>
+#include <unistd.h>
+
+#if defined _WIN32 && ! defined __CYGWIN__
+/* Get declarations of the native Windows API functions. */
+# define WIN32_LEAN_AND_MEAN
+# include <windows.h>
+/* Get _get_osfhandle. */
+# if GNULIB_MSVC_NOTHROW
+# include "msvc-nothrow.h"
+# else
+# include <io.h>
+# endif
+#endif
+
+#include "binary-io.h"
+#include "macros.h"
+
+/* Return non-zero if FD is open and inheritable across exec/spawn. */
+static int
+is_inheritable (int fd)
+{
+#if defined _WIN32 && ! defined __CYGWIN__
+ /* On native Windows, the initial state of unassigned standard file
+ descriptors is that they are open but point to an
+ INVALID_HANDLE_VALUE, and there is no fcntl. */
+ HANDLE h = (HANDLE) _get_osfhandle (fd);
+ DWORD flags;
+ if (h == INVALID_HANDLE_VALUE || GetHandleInformation (h, &flags) == 0)
+ return 0;
+ return (flags & HANDLE_FLAG_INHERIT) != 0;
+#else
+# ifndef F_GETFD
+# error Please port fcntl to your platform
+# endif
+ int i = fcntl (fd, F_GETFD);
+ return 0 <= i && (i & FD_CLOEXEC) == 0;
+#endif
+}
+
+#if !O_BINARY
+# define set_binary_mode(f,m) zero ()
+static int zero (void) { return 0; }
+#endif
+
+/* Return non-zero if FD is open in the given MODE, which is either
+ O_TEXT or O_BINARY. */
+static int
+is_mode (int fd, int mode)
+{
+ int value = set_binary_mode (fd, O_BINARY);
+ set_binary_mode (fd, value);
+ return mode == value;
+}
+
+int
+main (void)
+{
+ const char *file = "test-cloexec.tmp";
+ int fd = creat (file, 0600);
+ int fd2;
+ int bad_fd = getdtablesize ();
+
+ /* Assume std descriptors were provided by invoker. */
+ ASSERT (STDERR_FILENO < fd);
+ ASSERT (is_inheritable (fd));
+
+ /* Normal use of set_cloexec_flag. */
+ ASSERT (set_cloexec_flag (fd, true) == 0);
+#if !(defined _WIN32 && ! defined __CYGWIN__)
+ ASSERT (!is_inheritable (fd));
+#endif
+ ASSERT (set_cloexec_flag (fd, false) == 0);
+ ASSERT (is_inheritable (fd));
+
+ /* Normal use of dup_cloexec. */
+ fd2 = dup_cloexec (fd);
+ ASSERT (fd < fd2);
+ ASSERT (!is_inheritable (fd2));
+ ASSERT (close (fd) == 0);
+ ASSERT (dup_cloexec (fd2) == fd);
+ ASSERT (!is_inheritable (fd));
+ ASSERT (close (fd2) == 0);
+
+ /* On systems that distinguish between text and binary mode,
+ dup_cloexec reuses the mode of the source. */
+ set_binary_mode (fd, O_BINARY);
+ ASSERT (is_mode (fd, O_BINARY));
+ fd2 = dup_cloexec (fd);
+ ASSERT (fd < fd2);
+ ASSERT (is_mode (fd2, O_BINARY));
+ ASSERT (close (fd2) == 0);
+ set_binary_mode (fd, O_TEXT);
+ ASSERT (is_mode (fd, O_TEXT));
+ fd2 = dup_cloexec (fd);
+ ASSERT (fd < fd2);
+ ASSERT (is_mode (fd2, O_TEXT));
+ ASSERT (close (fd2) == 0);
+
+ /* Test error handling. */
+ errno = 0;
+ ASSERT (set_cloexec_flag (-1, false) == -1);
+ ASSERT (errno == EBADF);
+ errno = 0;
+ ASSERT (set_cloexec_flag (bad_fd, false) == -1);
+ ASSERT (errno == EBADF);
+ errno = 0;
+ ASSERT (set_cloexec_flag (fd2, false) == -1);
+ ASSERT (errno == EBADF);
+ errno = 0;
+ ASSERT (dup_cloexec (-1) == -1);
+ ASSERT (errno == EBADF);
+ errno = 0;
+ ASSERT (dup_cloexec (bad_fd) == -1);
+ ASSERT (errno == EBADF);
+ errno = 0;
+ ASSERT (dup_cloexec (fd2) == -1);
+ ASSERT (errno == EBADF);
+
+ /* Clean up. */
+ ASSERT (close (fd) == 0);
+ ASSERT (unlink (file) == 0);
+
+ return 0;
+}