OpenSolaris Launch

1 files changed, 65 insertions, 0 deletions

diff --git a/usr/src/lib/libc/port/sys/sigstack.c b/usr/src/lib/libc/port/sys/sigstack.c
new file mode 100644
index 0000000000..9b147051b0
--- /dev/null
+++ b/usr/src/lib/libc/port/sys/sigstack.c
@@ -0,0 +1,65 @@
+/*
+ * CDDL HEADER START
+ *
+ * The contents of this file are subject to the terms of the
+ * Common Development and Distribution License, Version 1.0 only
+ * (the "License").  You may not use this file except in compliance
+ * with the License.
+ *
+ * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
+ * or http://www.opensolaris.org/os/licensing.
+ * See the License for the specific language governing permissions
+ * and limitations under the License.
+ *
+ * When distributing Covered Code, include this CDDL HEADER in each
+ * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
+ * If applicable, add the following below this CDDL HEADER, with the
+ * fields enclosed by brackets "[]" replaced with your own identifying
+ * information: Portions Copyright [yyyy] [name of copyright owner]
+ *
+ * CDDL HEADER END
+ */
+/*
+ * Copyright 2004 Sun Microsystems, Inc.  All rights reserved.
+ * Use is subject to license terms.
+ */
+
+/*	Copyright (c) 1984, 1986, 1987, 1988, 1989 AT&T	*/
+/*	  All Rights Reserved  	*/
+
+#pragma ident	"%Z%%M%	%I%	%E% SMI"
+
+#pragma weak sigstack = _sigstack
+
+#include "lint.h"
+#include <sys/types.h>
+#include <sys/ucontext.h>
+#include <signal.h>
+#include <errno.h>
+
+int
+_sigstack(struct sigstack *nss, struct sigstack *oss)
+{
+	struct sigaltstack nalt;
+	struct sigaltstack oalt;
+	struct sigaltstack *naltp;
+
+	if (nss) {
+		/* Assumes stack growth is down */
+		nalt.ss_sp = (char *)nss->ss_sp - SIGSTKSZ;
+		nalt.ss_size = SIGSTKSZ;
+		nalt.ss_flags = 0;
+		naltp = &nalt;
+	} else
+		naltp = (struct sigaltstack *)0;
+
+	if (sigaltstack(naltp, &oalt) < 0)
+		return (-1);
+
+	if (oss) {
+		/* Assumes stack growth is down */
+		oss->ss_sp = (char *)oalt.ss_sp + oalt.ss_size;
+		oss->ss_onstack = ((oalt.ss_flags & SS_ONSTACK) != 0);
+	}
+	return (0);
+}