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/*
* Copyright (C) 2012 Canonical Ltd
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License version 3 as
* published by the Free Software Foundation.
*
* 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 Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
* Authored by: Thomas Voss <thomas.voss@canonical.com>
* Ricardo Mendoza <ricardo.mendoza@canonical.com>
*/
#ifndef BASE_BRIDGE_H_
#define BASE_BRIDGE_H_
#include <assert.h>
#include <dlfcn.h>
#include <stddef.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#define MAX_MODULE_NAME 32
#define HIDDEN_SYMBOL __attribute__ ((visibility ("hidden")))
namespace internal
{
template<typename Scope>
class HIDDEN_SYMBOL Bridge
{
public:
static Bridge<Scope>& instance()
{
static Bridge<Scope> bridge;
return bridge;
}
void* resolve_symbol(const char* symbol, const char* module = "") const
{
static const char* test_modules = secure_getenv("UBUNTU_PLATFORM_API_TEST_OVERRIDE");
if (test_modules && strstr(test_modules, module)) {
printf("Platform API: INFO: Overriding symbol '%s' with test version\n", symbol);
return Scope::dlsym_fn(lib_override_handle, symbol);
} else {
return Scope::dlsym_fn(lib_handle, symbol);
}
}
protected:
Bridge()
: lib_handle(Scope::dlopen_fn(Scope::path(), RTLD_LAZY))
{
if (Scope::override_path() && secure_getenv("UBUNTU_PLATFORM_API_TEST_OVERRIDE"))
lib_override_handle = (Scope::dlopen_fn(Scope::override_path(), RTLD_LAZY));
}
~Bridge()
{
}
void* lib_handle;
void* lib_override_handle;
};
}
#endif // BRIDGE_H_
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