mirror of
https://gitlab.isc.org/isc-projects/kea
synced 2025-08-22 01:49:48 +00:00
72 lines
2.8 KiB
C++
72 lines
2.8 KiB
C++
// Copyright (C) 2013-2021 Internet Systems Consortium, Inc. ("ISC")
|
|
//
|
|
// This Source Code Form is subject to the terms of the Mozilla Public
|
|
// License, v. 2.0. If a copy of the MPL was not distributed with this
|
|
// file, You can obtain one at http://mozilla.org/MPL/2.0/.
|
|
|
|
#ifndef HOOKS_H
|
|
#define HOOKS_H
|
|
|
|
#include <hooks/callout_handle.h>
|
|
#include <hooks/library_handle.h>
|
|
|
|
namespace {
|
|
|
|
// Version 10904 of the hooks framework, set for Kea 1.9.4
|
|
const int KEA_HOOKS_VERSION = 10904;
|
|
|
|
// Names of the framework functions.
|
|
const char* const LOAD_FUNCTION_NAME = "load";
|
|
const char* const UNLOAD_FUNCTION_NAME = "unload";
|
|
const char* const VERSION_FUNCTION_NAME = "version";
|
|
const char* const MULTI_THREADING_COMPATIBLE_FUNCTION_NAME =
|
|
"multi_threading_compatible";
|
|
|
|
// Typedefs for pointers to the framework functions.
|
|
typedef int (*version_function_ptr)();
|
|
typedef int (*load_function_ptr)(isc::hooks::LibraryHandle&);
|
|
typedef int (*unload_function_ptr)();
|
|
typedef int (*multi_threading_compatible_function_ptr)();
|
|
|
|
} // Anonymous namespace
|
|
|
|
namespace isc {
|
|
namespace hooks {
|
|
|
|
/// @brief User-Library Initialization for Statically-Linked Kea
|
|
///
|
|
/// If Kea is statically-linked, a user-created hooks library will not be
|
|
/// able to access symbols in it. In particular, it will not be able to access
|
|
/// singleton objects.
|
|
///
|
|
/// The hooks framework handles some of this. For example, although there is
|
|
/// a singleton ServerHooks object, hooks framework objects store a reference
|
|
/// to it when they are created. When the user library needs to register a
|
|
/// callout (which requires access to the ServerHooks information), it accesses
|
|
/// the ServerHooks object through a pointer passed from the Kea image.
|
|
///
|
|
/// The logging framework is more problematical. Here the code is partly
|
|
/// statically linked (the Kea logging library) and partly shared (the
|
|
/// log4cplus). The state of the former is not accessible to the user library,
|
|
/// but the state of the latter is. So within the user library, we need to
|
|
/// initialize the Kea logging library but not initialize the log4cplus
|
|
/// code. Some of the initialization is done when the library is loaded, but
|
|
/// other parts are done at run-time.
|
|
///
|
|
/// This function - to be called by the user library code in its load() function
|
|
/// when running against a statically linked Kea - initializes the Kea
|
|
/// logging library. In particular, it loads the message dictionary with the
|
|
/// text of the Kea messages.
|
|
///
|
|
/// @note This means that the virtual address space is loaded with two copies
|
|
/// of the message dictionary. Depending on how the user libraries are linked,
|
|
/// loading multiple user libraries may involve loading one message dictionary
|
|
/// per library.
|
|
|
|
void hooksStaticLinkInit();
|
|
|
|
} // namespace hooks
|
|
} // namespace isc
|
|
|
|
#endif // HOOKS_H
|