--- /dev/null
+++ Libc/Libc-583/sys/sigaction.c
@@ -0,0 +1,75 @@
+/*
+ * 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@
+ */
+/*
+ * Copyright (c) 1995 NeXT Computer, Inc. All Rights Reserved
+ *
+ *	@(#)sigaction.c	1.0
+ */
+
+#include <unistd.h>
+#include <signal.h>
+#include <sys/signal.h>
+#include <errno.h>
+
+/*
+ *	Intercept the sigaction syscall and use our signal trampoline
+ *	as the signal handler instead.  The code here is derived
+ *	from sigvec in sys/kern_sig.c.
+ */
+extern int __sigaction (int, struct __sigaction * __restrict, struct sigaction * __restrict);
+
+int
+sigaction (int sig, const struct sigaction * __restrict nsv, struct sigaction * __restrict osv)
+{
+	extern void _sigtramp();
+	struct __sigaction sa;
+	struct __sigaction *sap;
+
+	if (sig <= 0 || sig >= NSIG || sig == SIGKILL || sig == SIGSTOP) {
+	        errno = EINVAL;
+	        return (-1);
+	}
+	sap = (struct __sigaction *)0;
+	if (nsv) {
+		sa.sa_handler = nsv->sa_handler;
+		sa.sa_tramp = _sigtramp;
+		sa.sa_mask = nsv->sa_mask;
+		sa.sa_flags = nsv->sa_flags;	
+		sap = &sa;
+	}
+	return __sigaction(sig, sap, osv);
+}
+
+// XXX
+#ifdef __DYNAMIC__
+
+int
+_sigaction_nobind (sig, nsv, osv)
+        int sig;
+	register const struct sigaction *nsv;
+        register struct sigaction *osv;
+{
+    return sigaction(sig, nsv, osv);
+}
+#endif
+