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/usr/include/lttng/bug.h is in liblttng-ust-dev 2.0.2-0ubuntu1.

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#ifndef _LTTNG_BUG_H
#define _LTTNG_BUG_H

/*
 * lttng/bug.h
 *
 * (C) Copyright 2010-2011 - Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 */

#include <urcu/compiler.h>
#include <stdio.h>
#include <stdlib.h>

#define LTTNG_BUG_ON(condition)						\
	do {								\
		if (caa_unlikely(condition)) {				\
			fprintf(stderr,					\
				"LTTng BUG in file %s, line %d.\n",	\
				__FILE__, __LINE__);			\
			exit(EXIT_FAILURE);				\
		}							\
	} while (0)

#define LTTNG_BUILD_BUG_ON(condition)					\
	((void) sizeof(char[-!!(condition)]))

/**
 * LTTNG_BUILD_RUNTIME_BUG_ON - check condition at build (if constant) or runtime
 * @condition: the condition which should be false.
 *
 * If the condition is a constant and true, the compiler will generate a build
 * error. If the condition is not constant, a BUG will be triggered at runtime
 * if the condition is ever true. If the condition is constant and false, no
 * code is emitted.
 */
#define LTTNG_BUILD_RUNTIME_BUG_ON(condition)			\
	do {							\
		if (__builtin_constant_p(condition))		\
			LTTNG_BUILD_BUG_ON(condition);		\
		else						\
			LTTNG_BUG_ON(condition);		\
	} while (0)

#endif