--- /dev/null
+++ Libc/Libc-498/sys/sigsuspend.c
@@ -0,0 +1,49 @@
+/*
+ * Copyright (c) 1999 Apple Computer, Inc. All rights reserved.
+ *
+ * @APPLE_LICENSE_HEADER_START@
+ * 
+ * This file contains Original Code and/or Modifications of Original Code
+ * as defined in and that are subject to the Apple Public Source License
+ * Version 2.0 (the 'License'). You may not use this file except in
+ * compliance with the License. Please obtain a copy of the License at
+ * http://www.opensource.apple.com/apsl/ and read it before using this
+ * file.
+ * 
+ * The Original Code and all software distributed under the License are
+ * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
+ * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
+ * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
+ * Please see the License for the specific language governing rights and
+ * limitations under the License.
+ * 
+ * @APPLE_LICENSE_HEADER_END@
+ */
+/*	@(#)sigsuspend.c	1.0	9/22/95	(c) 1995 NeXT	*/
+
+#include <signal.h>
+#include <unistd.h>
+
+#ifdef VARIANT_CANCELABLE
+int __sigsuspend (const sigset_t);
+#else /* !VARIANT_CANCELABLE */
+int __sigsuspend_nocancel(const sigset_t);
+#endif /* VARIANT_CANCELABLE */
+
+int
+sigsuspend (const sigset_t *sigmask_p)
+{
+    sigset_t	mask;
+
+    if (sigmask_p)
+        mask = *sigmask_p;
+    else
+        sigemptyset(&mask);
+#ifdef VARIANT_CANCELABLE
+    return __sigsuspend(mask);
+#else /* !VARIANT_CANCELABLE */
+    return __sigsuspend_nocancel(mask);
+#endif /* VARIANT_CANCELABLE */
+}
+