new file mode 100644
--- /dev/null
+++ b/lib/spawnattr_setdefault.c
@@ -0,0 +1,33 @@
+/* Copyright (C) 2000 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   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>
+
+/* Specification.  */
+#include <spawn.h>
+
+#include <string.h>
+
+/* Set signal mask for signals with default handling in ATTR to SIGDEFAULT.  */
+int
+posix_spawnattr_setsigdefault (posix_spawnattr_t *attr,
+			       const sigset_t *sigdefault)
+{
+  /* Copy the sigset_t data to the user buffer.  */
+  memcpy (&attr->_sd, sigdefault, sizeof (sigset_t));
+
+  return 0;
+}