vendor/openzfs/2.0-rc0-g184df27

1 files changed, 74 insertions, 0 deletions

diff --git a/lib/libspl/include/sys/stack.h b/lib/libspl/include/sys/stack.h
new file mode 100644
index 000000000000..59807e97b6a0
--- /dev/null
+++ b/lib/libspl/include/sys/stack.h
@@ -0,0 +1,74 @@
+/*
+ * CDDL HEADER START
+ *
+ * The contents of this file are subject to the terms of the
+ * Common Development and Distribution License (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
+ */
+/*
+ * This header file distributed under the terms of the CDDL.
+ * Portions Copyright 2008 Sun Microsystems, Inc. All Rights reserved.
+ */
+#ifndef _SYS_STACK_H
+#define	_SYS_STACK_H
+
+#include <pthread.h>
+
+#define	STACK_BIAS	0
+
+#ifdef __USE_GNU
+
+static inline int
+stack_getbounds(stack_t *sp)
+{
+	pthread_attr_t attr;
+	int rc;
+
+	rc = pthread_getattr_np(pthread_self(), &attr);
+	if (rc)
+		return (rc);
+
+	rc = pthread_attr_getstack(&attr, &sp->ss_sp, &sp->ss_size);
+	if (rc == 0)
+		sp->ss_flags = 0;
+
+	pthread_attr_destroy(&attr);
+
+	return (rc);
+}
+
+static inline int
+thr_stksegment(stack_t *sp)
+{
+	int rc;
+
+	rc = stack_getbounds(sp);
+	if (rc)
+		return (rc);
+
+	/*
+	 * thr_stksegment() is expected to set sp.ss_sp to the high stack
+	 * address, but the stack_getbounds() interface is expected to
+	 * set sp.ss_sp to the low address.  Adjust accordingly.
+	 */
+	sp->ss_sp = (void *)(((uintptr_t)sp->ss_sp) + sp->ss_size);
+	sp->ss_flags = 0;
+
+	return (rc);
+}
+
+#endif /* __USE_GNU */
+#endif /* _SYS_STACK_H */