src/jdk.accessibility/windows/native/libjabsysinfo/AccessBridgeSysInfo.cpp

/*
 * Copyright (c) 2014, 2015, Oracle and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.  Oracle designates this
 * particular file as subject to the "Classpath" exception as provided
 * by Oracle in the LICENSE file that accompanied this code.
 *
 * This code 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
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
 * or visit www.oracle.com if you need additional information or have any
 * questions.
 */

#include <exception>
#include <stdexcept>
#include <jni.h>
#include <windows.h>
#include <WinDef.h>

extern "C" {

BOOL WINAPI DllMain(HINSTANCE hinstDll, DWORD fdwReason, LPVOID lpvReserved) {
    return TRUE;
}

// Determine bitness of Win OS
JNIEXPORT jboolean JNICALL
Java_com_sun_java_accessibility_internal_AccessBridge_isSysWow(JNIEnv *env, jobject callingObj) {
    BOOL bIsWow64 = FALSE;
    typedef BOOL (WINAPI *LPFN_ISWOW64PROCESS) (HANDLE, PBOOL);

    LPFN_ISWOW64PROCESS fnIsWow64Process =
        (LPFN_ISWOW64PROCESS)GetProcAddress(GetModuleHandle(TEXT("kernel32")), "IsWow64Process");

    if (fnIsWow64Process != NULL) {
        if (!fnIsWow64Process(GetCurrentProcess(), &bIsWow64)) {
            throw std::runtime_error("fnIsWow64Process() failed");
        }
    }

    return bIsWow64 ? JNI_TRUE : JNI_FALSE;
}

}