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// Copyright (C) 2013-2017 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/.
/// @file
/// @brief Basic library with load() function
///
/// This is source of a test library for various test (LibraryManager and
/// HooksManager). The characteristics of the library produced from this
/// file are:
///
/// - The "version" and "load" framework functions are supplied. One "standard"
/// callout is supplied ("hookpt_one") and two non-standard ones which are
/// registered during the call to "load" on the hooks "hookpt_two" and
/// "hookpt_three".
///
/// All callouts do trivial calculations, the result of all being called in
/// sequence being
///
/// @f[ ((5 * data_1) + data_2) * data_3 @f]
///
/// ...where data_1, data_2 and data_3 are the values passed in arguments of
/// the same name to the three callouts (data_1 passed to hookpt_one, data_2
/// to hookpt_two etc.) and the result is returned in the argument "result".
#include <config.h>
#include <hooks/hooks.h>
using namespace isc::hooks;
extern "C" {
// Callouts
int
context_create(CalloutHandle& handle) {
handle.setContext("result", static_cast<int>(5));
handle.setArgument("result", static_cast<int>(5));
return (0);
}
// First callout adds the passed "data_1" argument to the initialized context
// value of 5. (Note that the value set by context_create is accessed through
// context and not the argument, so checking that context is correctly passed
// between callouts in the same library.)
int
hookpt_one(CalloutHandle& handle) {
int data;
handle.getArgument("data_1", data);
int result;
handle.getContext("result", result);
result *= data;
handle.setArgument("result", result);
return (0);
}
// Second callout multiplies the current context value by the "data_2"
// argument.
static int
hook_nonstandard_two(CalloutHandle& handle) {
int data;
handle.getArgument("data_2", data);
int result;
handle.getArgument("result", result);
result += data;
handle.setArgument("result", result);
return (0);
}
// Third callout adds "data_3" to the result.
static int
hook_nonstandard_three(CalloutHandle& handle) {
int data;
handle.getArgument("data_3", data);
int result;
handle.getArgument("result", result);
result *= data;
handle.setArgument("result", result);
return (0);
}
// First command handler assigns data to a result.
static int
command_handler_one(CalloutHandle& handle) {
int data;
handle.getArgument("data_1", data);
int result;
handle.getArgument("result", result);
result = data;
handle.setArgument("result", result);
return (0);
}
// Second command handler multiples the result by data by 10.
static int
command_handler_two(CalloutHandle& handle) {
int data;
handle.getArgument("data_2", data);
int result;
handle.getArgument("result", result);
result *= data * 10;
handle.setArgument("result", result);
return (0);
}
// Framework functions
int
version() {
return (KEA_HOOKS_VERSION);
}
int load(LibraryHandle& handle) {
// Initialize the user library if the main image was statically linked
#ifdef USE_STATIC_LINK
hooksStaticLinkInit();
#endif
// Register the non-standard functions
handle.registerCallout("hookpt_two", hook_nonstandard_two);
handle.registerCallout("hookpt_three", hook_nonstandard_three);
// Register command_handler_one as control command handler.
handle.registerCommandCallout("command-one", command_handler_one);
handle.registerCommandCallout("command-two", command_handler_two);
return (0);
}
};
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