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+/*
+ * This file and its contents are supplied under the terms of the
+ * Common Development and Distribution License ("CDDL"), version 1.0.
+ * You may only use this file in accordance with the terms of version
+ * 1.0 of the CDDL.
+ *
+ * A full copy of the text of the CDDL should have accompanied this
+ * source. A copy of the CDDL is also available via the Internet at
+ * http://www.illumos.org/license/CDDL.
+ */
+
+/*
+ * Copyright 2020 Oxide Computer Company
+ */
+
+#ifndef _UPANIC_H
+#define _UPANIC_H
+
+/*
+ * Support for guaranteed user process abort-like termination.
+ */
+
+#include <sys/feature_tests.h>
+#include <stddef.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+extern _NORETURN_KYWD void upanic(const char *, size_t) __NORETURN;
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* _UPANIC_H */