+/*
+ * SPDX-License-Identifier: MIT
+ *
+ * Copyright (C) 2010-2011 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
+ */
+
+#ifndef _LTTNG_UST_COMPAT_H
+#define _LTTNG_UST_COMPAT_H
+
+#include <unistd.h>
+#include <limits.h>
+
+#ifdef __FreeBSD__
+#include <machine/param.h>
+#endif
+
+#ifdef _SC_PAGE_SIZE
+#define LTTNG_UST_PAGE_SIZE sysconf(_SC_PAGE_SIZE)
+#elif defined(PAGE_SIZE)
+#define LTTNG_UST_PAGE_SIZE PAGE_SIZE
+#else
+#error "Please add page size detection for your OS."
+#endif
+
+#define LTTNG_UST_PAGE_MASK (~(LTTNG_UST_PAGE_SIZE - 1))
+
+#define __LTTNG_UST_ALIGN_MASK(v, mask) (((v) + (mask)) & ~(mask))
+#define LTTNG_UST_ALIGN(v, align) __LTTNG_UST_ALIGN_MASK(v, (__typeof__(v)) (align) - 1)
+#define LTTNG_UST_PAGE_ALIGN(addr) LTTNG_UST_ALIGN(addr, LTTNG_UST_PAGE_SIZE)
+
+#endif