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+/* Copyright (C) 1991, 1995 Free Software Foundation, Inc.
+This file is part of the GNU C Library.
+
+The GNU C Library is free software; you can redistribute it and/or
+modify it under the terms of the GNU Library General Public License as
+published by the Free Software Foundation; either version 2 of the
+License, or (at your option) any later version.
+
+The GNU C Library 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
+Library General Public License for more details.
+
+You should have received a copy of the GNU Library General Public
+License along with the GNU C Library; see the file COPYING.LIB. If
+not, write to the Free Software Foundation, Inc., 675 Mass Ave,
+Cambridge, MA 02139, USA. */
+
+/* Definitions relevant to functions that operate on `sigset_t's. */
+
+#include <ansidecl.h>
+#include <errno.h>
+#include <signal.h>
+#include <string.h>
+
+#define BITS (_NSIG - 1)
+#define ELT(signo) (((signo) - 1) / BITS)
+#define MASK(signo) (1 << (((signo) - 1) % BITS))
+
+#undef sigemptyset
+#undef sigfillset
+#undef sigaddset
+#undef sigdelset
+#undef sigismember