/usr/include/dbus-1.0/dbus/dbus-macros.h is in libdbus-1-dev 1.12.2-1ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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/* dbus-macros.h generic macros
*
* Copyright (C) 2002 Red Hat Inc.
*
* Licensed under the Academic Free License version 2.1
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*
*/
#if !defined (DBUS_INSIDE_DBUS_H) && !defined (DBUS_COMPILATION)
#error "Only <dbus/dbus.h> can be included directly, this file may disappear or change contents."
#endif
#ifndef DBUS_MACROS_H
#define DBUS_MACROS_H
#ifdef __cplusplus
# define DBUS_BEGIN_DECLS extern "C" {
# define DBUS_END_DECLS }
#else
# define DBUS_BEGIN_DECLS
# define DBUS_END_DECLS
#endif
#ifndef TRUE
# define TRUE 1
#endif
#ifndef FALSE
# define FALSE 0
#endif
#ifndef NULL
# ifdef __cplusplus
# define NULL (0L)
# else /* !__cplusplus */
# define NULL ((void*) 0)
# endif /* !__cplusplus */
#endif
#if __GNUC__ > 3 || (__GNUC__ == 3 && __GNUC_MINOR__ >= 1)
# define DBUS_DEPRECATED __attribute__ ((__deprecated__))
#elif defined(_MSC_VER) && (_MSC_VER >= 1300)
# define DBUS_DEPRECATED __declspec(deprecated)
#else
# define DBUS_DEPRECATED
#endif
#if __GNUC__ > 2 || (__GNUC__ == 2 && __GNUC_MINOR__ >= 8)
# define _DBUS_GNUC_EXTENSION __extension__
#else
# define _DBUS_GNUC_EXTENSION
#endif
#if (__GNUC__ > 2 || (__GNUC__ == 2 && __GNUC_MINOR__ > 4)) || \
defined(__clang__)
#define _DBUS_GNUC_PRINTF( format_idx, arg_idx ) \
__attribute__((__format__ (__printf__, format_idx, arg_idx)))
#define _DBUS_GNUC_NORETURN \
__attribute__((__noreturn__))
#define _DBUS_GNUC_UNUSED \
__attribute__((__unused__))
#else /* !__GNUC__ */
#define _DBUS_GNUC_PRINTF( format_idx, arg_idx )
#define _DBUS_GNUC_NORETURN
#define _DBUS_GNUC_UNUSED
#endif /* !__GNUC__ */
#if __GNUC__ > 2 || (__GNUC__ == 2 && __GNUC_MINOR__ >= 96)
#define DBUS_MALLOC __attribute__((__malloc__))
#else
#define DBUS_MALLOC
#endif
#if (__GNUC__ > 4) || (__GNUC__ == 4 && __GNUC_MINOR__ >= 3)
#define DBUS_ALLOC_SIZE(x) __attribute__((__alloc_size__(x)))
#define DBUS_ALLOC_SIZE2(x,y) __attribute__((__alloc_size__(x,y)))
#else
#define DBUS_ALLOC_SIZE(x)
#define DBUS_ALLOC_SIZE2(x,y)
#endif
#if (__GNUC__ > 3) || (__GNUC__ == 3 && __GNUC_MINOR__ >= 4)
#define _DBUS_GNUC_WARN_UNUSED_RESULT __attribute__((warn_unused_result))
#else
#define _DBUS_GNUC_WARN_UNUSED_RESULT
#endif
/** @def _DBUS_GNUC_PRINTF
* used to tell gcc about printf format strings
*/
/** @def _DBUS_GNUC_NORETURN
* used to tell gcc about functions that never return, such as _dbus_abort()
*/
/** @def _DBUS_GNUC_WARN_UNUSED_RESULT
* used to tell gcc about functions whose result must be used
*/
/* Normally docs are in .c files, but there isn't a .c file for this. */
/**
* @defgroup DBusMacros Utility macros
* @ingroup DBus
* @brief #TRUE, #FALSE, #NULL, and so on
*
* Utility macros.
*
* @{
*/
/**
* @def DBUS_BEGIN_DECLS
*
* Macro used prior to declaring functions in the D-Bus header
* files. Expands to "extern "C"" when using a C++ compiler,
* and expands to nothing when using a C compiler.
*
* Please don't use this in your own code, consider it
* D-Bus internal.
*/
/**
* @def DBUS_END_DECLS
*
* Macro used after declaring functions in the D-Bus header
* files. Expands to "}" when using a C++ compiler,
* and expands to nothing when using a C compiler.
*
* Please don't use this in your own code, consider it
* D-Bus internal.
*/
/**
* @def TRUE
*
* Expands to "1"
*/
/**
* @def FALSE
*
* Expands to "0"
*/
/**
* @def NULL
*
* A null pointer, defined appropriately for C or C++.
*/
/**
* @def DBUS_DEPRECATED
*
* Tells the compiler to warn about a function or type if it's used.
* Code marked in this way should also be enclosed in
* @code
* #ifndef DBUS_DISABLE_DEPRECATED
* deprecated stuff here
* #endif
* @endcode
*
* Please don't use this in your own code, consider it
* D-Bus internal.
*/
/**
* @def _DBUS_GNUC_EXTENSION
*
* Tells gcc not to warn about extensions to the C standard in the
* following expression, even if compiling with -pedantic. Do not use
* this macro in your own code; please consider it to be internal to libdbus.
*/
/*
* @def DBUS_EXPORT
*
* Declare the following symbol as public. This is currently a noop on
* platforms other than Windows.
*/
#if defined(DBUS_EXPORT)
/* value forced by compiler command line, don't redefine */
#elif defined(_WIN32)
# if defined(DBUS_STATIC_BUILD)
# define DBUS_EXPORT
# elif defined(dbus_1_EXPORTS)
# define DBUS_EXPORT __declspec(dllexport)
# else
# define DBUS_EXPORT __declspec(dllimport)
# endif
#elif defined(__GNUC__) && __GNUC__ >= 4
# define DBUS_EXPORT __attribute__ ((__visibility__ ("default")))
#else
#define DBUS_EXPORT
#endif
#if defined(DBUS_PRIVATE_EXPORT)
/* value forced by compiler command line, don't redefine */
#elif defined(_WIN32)
# if defined(DBUS_STATIC_BUILD)
# define DBUS_PRIVATE_EXPORT /* no decoration */
# elif defined(dbus_1_EXPORTS)
# define DBUS_PRIVATE_EXPORT __declspec(dllexport)
# else
# define DBUS_PRIVATE_EXPORT __declspec(dllimport)
# endif
#elif defined(__GNUC__) && __GNUC__ >= 4
# define DBUS_PRIVATE_EXPORT __attribute__ ((__visibility__ ("default")))
#else
# define DBUS_PRIVATE_EXPORT /* no decoration */
#endif
/* Implementation for dbus_clear_message() etc. This is not API,
* do not use it directly.
*
* We're using a specific type (T ** and T *) instead of void ** and
* void * partly for type-safety, partly to be strict-aliasing-compliant,
* and partly to keep C++ compilers happy. This code is inlined into
* users of libdbus, so we can't rely on it having dbus' own compiler
* settings. */
#define _dbus_clear_pointer_impl(T, pointer_to_pointer, destroy) \
do { \
T **_pp = (pointer_to_pointer); \
T *_value = *_pp; \
\
*_pp = NULL; \
\
if (_value != NULL) \
destroy (_value); \
} while (0)
/* Not (destroy) (_value) in case destroy() is a function-like macro */
/** @} */
#endif /* DBUS_MACROS_H */
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