1 files changed, 44 insertions, 0 deletions
diff --git a/tests/dirfd.c b/tests/dirfd.c
new file mode 100644
index 00000000..afcf382e
--- /dev/null
+++ b/tests/dirfd.c
@@ -0,0 +1,44 @@
+/* dirfd.c -- return the file descriptor associated with an open DIR*
+
+   Copyright (C) 2001, 2006, 2008-2024 Free Software Foundation, Inc.
+
+   This file is free software: you can redistribute it and/or modify
+   it under the terms of the GNU Lesser General Public License as
+   published by the Free Software Foundation; either version 2.1 of the
+   License, or (at your option) any later version.
+
+   This file 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 Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public License
+   along with this program.  If not, see <https://www.gnu.org/licenses/>.  */
+
+/* Written by Jim Meyering. */
+
+#include <config.h>
+
+#include <dirent.h>
+#include <errno.h>
+
+#if GNULIB_defined_DIR
+# include "dirent-private.h"
+#endif
+
+int
+dirfd (DIR *dir_p)
+{
+#if GNULIB_defined_DIR
+  int fd = dir_p->fd_to_close;
+  if (fd == -1)
+    errno = EINVAL;
+  return fd;
+#else
+  int fd = DIR_TO_FD (dir_p);
+  if (fd == -1)
+    errno = ENOTSUP;
+
+  return fd;
+#endif
+}