mirror of
https://gitlab.freedesktop.org/dbus/dbus.git
synced 2026-05-02 09:38:23 +02:00
a24cf746e2
clang 13 fails to compile our current implementation with:
.../dbus/dbus-message.c:2070:3: error: variable length array folded to constant array as an extension [-Werror,-Wgnu-folding-constant]
_DBUS_STATIC_ASSERT (_DBUS_ALIGNOF (DBusMessageRealIter) <=
^
.../dbus/dbus-internals.h:460:25: note: expanded from macro '_DBUS_STATIC_ASSERT'
typedef struct { char _assertion[(expr) ? 1 : -1]; } \
This appears to be because the "traditional" definition of
offsetof(), which we're hard-coding here, does not qualify as a constant
expression under C rules due to its use of pointer casts.
Modern compilers like gcc and clang have a built-in implementation
of offsetof that *is* a constant expression.
Signed-off-by: Simon McVittie <smcv@collabora.com>
473 lines
18 KiB
C
473 lines
18 KiB
C
/* -*- mode: C; c-file-style: "gnu"; indent-tabs-mode: nil; -*- */
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/* dbus-internals.h random utility stuff (internal to D-Bus implementation)
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*
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* Copyright (C) 2002, 2003 Red Hat, Inc.
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*
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* Licensed under the Academic Free License version 2.1
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*
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*/
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#ifdef DBUS_INSIDE_DBUS_H
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#error "You can't include dbus-internals.h in the public header dbus.h"
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#endif
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#ifndef DBUS_INTERNALS_H
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#define DBUS_INTERNALS_H
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#include <dbus/dbus-memory.h>
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#include <dbus/dbus-types.h>
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#include <dbus/dbus-errors.h>
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#include <dbus/dbus-sysdeps.h>
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#include <dbus/dbus-threads-internal.h>
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DBUS_BEGIN_DECLS
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#ifdef DBUS_ENABLE_EMBEDDED_TESTS
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#define DBUS_EMBEDDED_TESTS_EXPORT DBUS_PRIVATE_EXPORT
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#else
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#define DBUS_EMBEDDED_TESTS_EXPORT /* nothing */
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#endif
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DBUS_PRIVATE_EXPORT
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void _dbus_warn (const char *format,
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...) _DBUS_GNUC_PRINTF (1, 2);
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DBUS_PRIVATE_EXPORT
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void _dbus_warn_check_failed (const char *format,
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...) _DBUS_GNUC_PRINTF (1, 2);
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DBUS_PRIVATE_EXPORT
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void _dbus_warn_return_if_fail (const char *function,
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const char *assertion,
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const char *file,
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int line);
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#if defined (__STDC_VERSION__) && (__STDC_VERSION__ >= 199901L)
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#define _DBUS_FUNCTION_NAME __func__
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#elif defined(__GNUC__) || defined(_MSC_VER)
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#define _DBUS_FUNCTION_NAME __FUNCTION__
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#else
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#define _DBUS_FUNCTION_NAME "unknown function"
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#endif
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/*
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* (code from GLib)
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*
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* The _DBUS_LIKELY and _DBUS_UNLIKELY macros let the programmer give hints to
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* the compiler about the expected result of an expression. Some compilers
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* can use this information for optimizations.
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*
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* The _DBUS_BOOLEAN_EXPR macro is intended to trigger a gcc warning when
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* putting assignments in the macro arg
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*/
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#if defined(__GNUC__) && (__GNUC__ > 2) && defined(__OPTIMIZE__)
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#define _DBUS_BOOLEAN_EXPR(expr) \
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__extension__ ({ \
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int _dbus_boolean_var_; \
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if (expr) \
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_dbus_boolean_var_ = 1; \
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else \
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_dbus_boolean_var_ = 0; \
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_dbus_boolean_var_; \
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})
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#define _DBUS_LIKELY(expr) (__builtin_expect (_DBUS_BOOLEAN_EXPR(expr), 1))
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#define _DBUS_UNLIKELY(expr) (__builtin_expect (_DBUS_BOOLEAN_EXPR(expr), 0))
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#else
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#define _DBUS_LIKELY(expr) (expr)
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#define _DBUS_UNLIKELY(expr) (expr)
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#endif
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#ifdef DBUS_ENABLE_VERBOSE_MODE
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/*
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at least gnu cc and msvc compiler are known to
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have support for variable macro argument lists
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add other compilers is required
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*/
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#if defined(__GNUC__) || defined(_MSC_VER)
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#define DBUS_CPP_SUPPORTS_VARIABLE_MACRO_ARGUMENTS
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#endif
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#ifdef DBUS_CPP_SUPPORTS_VARIABLE_MACRO_ARGUMENTS
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DBUS_PRIVATE_EXPORT
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void _dbus_verbose_real (const char *file, const int line, const char *function,
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const char *format,...) _DBUS_GNUC_PRINTF (4, 5);
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# define _dbus_verbose(fmt,...) _dbus_verbose_real( __FILE__,__LINE__,__FUNCTION__,fmt, ## __VA_ARGS__)
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#else
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DBUS_PRIVATE_EXPORT
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void _dbus_verbose_real (const char *format,
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...) _DBUS_GNUC_PRINTF (1, 2);
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# define _dbus_verbose _dbus_verbose_real
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#endif
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DBUS_PRIVATE_EXPORT
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void _dbus_verbose_reset_real (void);
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DBUS_PRIVATE_EXPORT
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dbus_bool_t _dbus_is_verbose_real (void);
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DBUS_PRIVATE_EXPORT
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dbus_bool_t _dbus_get_verbose (void);
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DBUS_PRIVATE_EXPORT
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void _dbus_set_verbose (dbus_bool_t state);
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void _dbus_verbose_raw (const char *s);
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# define _dbus_verbose_reset _dbus_verbose_reset_real
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# define _dbus_is_verbose _dbus_is_verbose_real
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#else
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# define _dbus_verbose(...) do { } while (0)
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# define _dbus_verbose_reset() do { } while (0)
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# define _dbus_is_verbose() FALSE
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#endif /* !DBUS_ENABLE_VERBOSE_MODE */
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DBUS_PRIVATE_EXPORT
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void _dbus_trace_ref (const char *obj_name,
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void *obj,
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int old_refcount,
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int new_refcount,
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const char *why,
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const char *env_var,
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int *enabled);
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DBUS_PRIVATE_EXPORT
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const char* _dbus_strerror (int error_number);
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#ifdef DBUS_DISABLE_ASSERT
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#define _dbus_assert(condition) do { } while (0)
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#else
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DBUS_PRIVATE_EXPORT
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void _dbus_real_assert (dbus_bool_t condition,
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const char *condition_text,
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const char *file,
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int line,
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const char *func);
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#define _dbus_assert(condition) \
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_dbus_real_assert ((condition) != 0, #condition, __FILE__, __LINE__, _DBUS_FUNCTION_NAME)
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#endif /* !DBUS_DISABLE_ASSERT */
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#ifdef DBUS_DISABLE_ASSERT
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#define _dbus_assert_not_reached(explanation) do { } while (0)
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#else
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DBUS_PRIVATE_EXPORT
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void _dbus_real_assert_not_reached (const char *explanation,
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const char *file,
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int line) _DBUS_GNUC_NORETURN;
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#define _dbus_assert_not_reached(explanation) \
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_dbus_real_assert_not_reached (explanation, __FILE__, __LINE__)
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#endif /* !DBUS_DISABLE_ASSERT */
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#ifdef DBUS_DISABLE_CHECKS
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#define _dbus_return_if_fail(condition)
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#define _dbus_return_val_if_fail(condition, val)
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#else
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#define _dbus_return_if_fail(condition) do { \
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_dbus_assert ((*(const char*)_DBUS_FUNCTION_NAME) != '_'); \
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if (!(condition)) { \
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_dbus_warn_return_if_fail (_DBUS_FUNCTION_NAME, #condition, __FILE__, __LINE__); \
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return; \
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} } while (0)
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#define _dbus_return_val_if_fail(condition, val) do { \
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_dbus_assert ((*(const char*)_DBUS_FUNCTION_NAME) != '_'); \
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if (!(condition)) { \
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_dbus_warn_return_if_fail (_DBUS_FUNCTION_NAME, #condition, __FILE__, __LINE__); \
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return (val); \
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} } while (0)
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#endif /* !DBUS_DISABLE_ASSERT */
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#define _DBUS_N_ELEMENTS(array) ((int) (sizeof ((array)) / sizeof ((array)[0])))
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#define _DBUS_POINTER_TO_INT(pointer) ((intptr_t)(pointer))
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#define _DBUS_INT_TO_POINTER(integer) ((void*)((intptr_t)(integer)))
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#define _DBUS_ZERO(object) (memset (&(object), '\0', sizeof ((object))))
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#ifdef offsetof
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#define _DBUS_STRUCT_OFFSET(struct_type, member) \
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(offsetof (struct_type, member))
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#else
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#define _DBUS_STRUCT_OFFSET(struct_type, member) \
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((intptr_t) ((unsigned char*) &((struct_type*) 0)->member))
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#endif
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#define _DBUS_ALIGNOF(type) \
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(_DBUS_STRUCT_OFFSET (struct { char _1; type _2; }, _2))
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#if defined(DBUS_DISABLE_CHECKS) || defined(DBUS_DISABLE_ASSERT)
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/* this is an assert and not an error, but in the typical --disable-checks case (you're trying
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* to really minimize code size), disabling these assertions makes sense.
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*/
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#define _DBUS_ASSERT_ERROR_IS_SET(error) do { } while (0)
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#define _DBUS_ASSERT_ERROR_IS_CLEAR(error) do { } while (0)
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#define _DBUS_ASSERT_ERROR_XOR_BOOL(error, retval) do { } while (0)
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#else
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static inline void
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_dbus_assert_error_is_set (const DBusError *error,
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const char *file,
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int line,
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const char *func)
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{
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_dbus_real_assert (error == NULL || dbus_error_is_set (error),
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"error is set", file, line, func);
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}
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static inline void
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_dbus_assert_error_is_clear (const DBusError *error,
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const char *file,
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int line,
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const char *func)
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{
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_dbus_real_assert (error == NULL || !dbus_error_is_set (error),
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"error is clear", file, line, func);
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}
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static inline void
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_dbus_assert_error_xor_bool (const DBusError *error,
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dbus_bool_t retval,
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const char *file,
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int line,
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const char *func)
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{
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_dbus_real_assert (error == NULL || dbus_error_is_set (error) == !retval,
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"error is consistent with boolean result", file, line, func);
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}
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/**
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* Assert that error is set, unless it is NULL in which case we cannot
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* tell whether it would have been set.
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*/
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#define _DBUS_ASSERT_ERROR_IS_SET(error) _dbus_assert_error_is_set (error, __FILE__, __LINE__, _DBUS_FUNCTION_NAME)
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/**
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* Assert that error is not set, unless it is NULL in which case we cannot
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* tell whether it would have been set.
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*/
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#define _DBUS_ASSERT_ERROR_IS_CLEAR(error) _dbus_assert_error_is_clear (error, __FILE__, __LINE__, _DBUS_FUNCTION_NAME)
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/**
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* Assert that error is consistent with retval: if error is not NULL,
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* it must be set if and only if retval is false.
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*
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* retval can be a boolean expression like "result != NULL".
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*/
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#define _DBUS_ASSERT_ERROR_XOR_BOOL(error, retval) _dbus_assert_error_xor_bool (error, retval, __FILE__, __LINE__, _DBUS_FUNCTION_NAME)
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#endif
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#define _dbus_return_if_error_is_set(error) _dbus_return_if_fail ((error) == NULL || !dbus_error_is_set ((error)))
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#define _dbus_return_val_if_error_is_set(error, val) _dbus_return_val_if_fail ((error) == NULL || !dbus_error_is_set ((error)), (val))
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/* This alignment thing is from ORBit2 */
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/* Align a value upward to a boundary, expressed as a number of bytes.
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* E.g. align to an 8-byte boundary with argument of 8.
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*/
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/*
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* (this + boundary - 1)
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* &
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* ~(boundary - 1)
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*/
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#define _DBUS_ALIGN_VALUE(this, boundary) \
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(( ((uintptr_t)(this)) + (((uintptr_t)(boundary)) -1)) & (~(((uintptr_t)(boundary))-1)))
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#define _DBUS_ALIGN_ADDRESS(this, boundary) \
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((void*)_DBUS_ALIGN_VALUE(this, boundary))
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DBUS_PRIVATE_EXPORT
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char* _dbus_strdup (const char *str);
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void* _dbus_memdup (const void *mem,
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size_t n_bytes);
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DBUS_PRIVATE_EXPORT
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dbus_bool_t _dbus_string_array_contains (const char **array,
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const char *str);
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DBUS_PRIVATE_EXPORT
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size_t _dbus_string_array_length (const char **array);
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char** _dbus_dup_string_array (const char **array);
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#define _DBUS_INT16_MIN ((dbus_int16_t) 0x8000)
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#define _DBUS_INT16_MAX ((dbus_int16_t) 0x7fff)
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#define _DBUS_UINT16_MAX ((dbus_uint16_t)0xffff)
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#define _DBUS_INT32_MIN ((dbus_int32_t) 0x80000000)
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#define _DBUS_INT32_MAX ((dbus_int32_t) 0x7fffffff)
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#define _DBUS_UINT32_MAX ((dbus_uint32_t)0xffffffff)
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/* using 32-bit here is sort of bogus */
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#define _DBUS_INT_MIN _DBUS_INT32_MIN
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#define _DBUS_INT_MAX _DBUS_INT32_MAX
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#define _DBUS_UINT_MAX _DBUS_UINT32_MAX
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#define _DBUS_INT64_MAX DBUS_INT64_CONSTANT (0x7fffffffffffffff)
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#define _DBUS_UINT64_MAX DBUS_UINT64_CONSTANT (0xffffffffffffffff)
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#define _DBUS_ONE_KILOBYTE 1024
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#define _DBUS_ONE_MEGABYTE 1024 * _DBUS_ONE_KILOBYTE
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#define _DBUS_ONE_HOUR_IN_MILLISECONDS (1000 * 60 * 60)
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#define _DBUS_USEC_PER_SECOND (1000000)
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#undef MAX
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#define MAX(a, b) (((a) > (b)) ? (a) : (b))
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#undef MIN
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#define MIN(a, b) (((a) < (b)) ? (a) : (b))
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#undef ABS
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#define ABS(a) (((a) < 0) ? -(a) : (a))
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#define _DBUS_ISASCII(c) ((c) != '\0' && (((c) & ~0x7f) == 0))
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typedef void (* DBusForeachFunction) (void *element,
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void *data);
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void _dbus_verbose_bytes (const unsigned char *data,
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int len,
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int offset);
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DBUS_PRIVATE_EXPORT
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void _dbus_verbose_bytes_of_string (const DBusString *str,
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int start,
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int len);
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DBUS_PRIVATE_EXPORT
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extern const char *_dbus_no_memory_message;
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#define _DBUS_SET_OOM(error) dbus_set_error_const ((error), DBUS_ERROR_NO_MEMORY, _dbus_no_memory_message)
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DBUS_PRIVATE_EXPORT
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void _dbus_set_error_valist (DBusError *error,
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const char *name,
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const char *format,
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va_list args) _DBUS_GNUC_PRINTF (3, 0);
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typedef dbus_bool_t (* DBusTestMemoryFunction) (void *data,
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dbus_bool_t have_memory);
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#ifdef DBUS_ENABLE_EMBEDDED_TESTS
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/* Memory debugging */
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void _dbus_set_fail_alloc_counter (int until_next_fail);
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int _dbus_get_fail_alloc_counter (void);
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void _dbus_set_fail_alloc_failures (int failures_per_failure);
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int _dbus_get_fail_alloc_failures (void);
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dbus_bool_t _dbus_decrement_fail_alloc_counter (void);
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dbus_bool_t _dbus_disable_mem_pools (void);
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DBUS_PRIVATE_EXPORT
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int _dbus_get_malloc_blocks_outstanding (void);
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DBUS_PRIVATE_EXPORT
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dbus_bool_t _dbus_test_oom_handling (const char *description,
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DBusTestMemoryFunction func,
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void *data);
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#else
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#define _dbus_set_fail_alloc_counter(n)
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#define _dbus_get_fail_alloc_counter _DBUS_INT_MAX
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/* These are constant expressions so that blocks
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* they protect should be optimized away
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*/
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#define _dbus_decrement_fail_alloc_counter() (FALSE)
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#define _dbus_disable_mem_pools() (FALSE)
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#define _dbus_get_malloc_blocks_outstanding() (0)
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#define _dbus_test_oom_handling(description, func, data) ((*func) (data, TRUE))
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#endif /* !DBUS_ENABLE_EMBEDDED_TESTS */
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typedef void (* DBusShutdownFunction) (void *data);
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DBUS_PRIVATE_EXPORT
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dbus_bool_t _dbus_register_shutdown_func (DBusShutdownFunction function,
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void *data);
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dbus_bool_t _dbus_register_shutdown_func_unlocked (DBusShutdownFunction function,
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void *data);
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extern int _dbus_current_generation;
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/* The weird case convention is to avoid having to change all the callers,
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* which would be quite a mega-patch. */
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typedef enum
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{
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/* index 0-4 */
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_DBUS_LOCK_list,
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_DBUS_LOCK_connection_slots,
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_DBUS_LOCK_pending_call_slots,
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_DBUS_LOCK_server_slots,
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_DBUS_LOCK_message_slots,
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/* index 5-9 */
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_DBUS_LOCK_bus,
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_DBUS_LOCK_bus_datas,
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_DBUS_LOCK_shutdown_funcs,
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_DBUS_LOCK_system_users,
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_DBUS_LOCK_message_cache,
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/* index 10-12 */
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_DBUS_LOCK_shared_connections,
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_DBUS_LOCK_machine_uuid,
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_DBUS_LOCK_sysdeps,
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_DBUS_N_GLOBAL_LOCKS
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} DBusGlobalLock;
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_DBUS_WARN_UNUSED_RESULT
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dbus_bool_t _dbus_lock (DBusGlobalLock lock);
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void _dbus_unlock (DBusGlobalLock lock);
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#define _DBUS_LOCK_NAME(name) _DBUS_LOCK_##name
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#define _DBUS_LOCK(name) _dbus_lock (_DBUS_LOCK_##name)
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#define _DBUS_UNLOCK(name) _dbus_unlock (_DBUS_LOCK_##name)
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DBUS_PRIVATE_EXPORT
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dbus_bool_t _dbus_address_append_escaped (DBusString *escaped,
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const DBusString *unescaped);
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void _dbus_set_bad_address (DBusError *error,
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const char *address_problem_type,
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const char *address_problem_field,
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const char *address_problem_other);
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#define DBUS_UUID_LENGTH_BYTES 16
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#define DBUS_UUID_LENGTH_WORDS (DBUS_UUID_LENGTH_BYTES / 4)
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#define DBUS_UUID_LENGTH_HEX (DBUS_UUID_LENGTH_BYTES * 2)
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/**
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* A globally unique ID ; we have one for each DBusServer, and also one for each
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* machine with libdbus installed on it.
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*/
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union DBusGUID
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{
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dbus_uint32_t as_uint32s[DBUS_UUID_LENGTH_WORDS]; /**< guid as four uint32 values */
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char as_bytes[DBUS_UUID_LENGTH_BYTES]; /**< guid as 16 single-byte values */
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};
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DBUS_PRIVATE_EXPORT _DBUS_WARN_UNUSED_RESULT
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dbus_bool_t _dbus_generate_uuid (DBusGUID *uuid,
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DBusError *error);
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DBUS_PRIVATE_EXPORT
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dbus_bool_t _dbus_uuid_encode (const DBusGUID *uuid,
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DBusString *encoded);
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dbus_bool_t _dbus_read_uuid_file (const DBusString *filename,
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DBusGUID *uuid,
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dbus_bool_t create_if_not_found,
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DBusError *error);
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dbus_bool_t _dbus_write_uuid_file (const DBusString *filename,
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const DBusGUID *uuid,
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DBusError *error);
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DBUS_PRIVATE_EXPORT
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dbus_bool_t _dbus_get_local_machine_uuid_encoded (DBusString *uuid_str,
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DBusError *error);
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#define _DBUS_PASTE2(a, b) a ## b
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#define _DBUS_PASTE(a, b) _DBUS_PASTE2 (a, b)
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#define _DBUS_STATIC_ASSERT(expr) \
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typedef struct { char _assertion[(expr) ? 1 : -1]; } \
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_DBUS_PASTE (_DBUS_STATIC_ASSERT_, __LINE__) _DBUS_GNUC_UNUSED
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#define _DBUS_STRINGIFY(x) #x
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#define _DBUS_FILE_LINE __FILE__ ":" _DBUS_STRINGIFY(__LINE__)
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DBUS_END_DECLS
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#endif /* DBUS_INTERNALS_H */
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