/* * Copyright (C) 2013 Apple Inc. All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS'' * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF * THE POSSIBILITY OF SUCH DAMAGE. */ #pragma once #if PLATFORM(MAC) #include <mach/message.h> namespace IPC { class ImportanceAssertion { WTF_MAKE_FAST_ALLOCATED; WTF_MAKE_NONCOPYABLE(ImportanceAssertion); public: explicit ImportanceAssertion(mach_msg_header_t* header) : m_voucher(0) { if (MACH_MSGH_BITS_HAS_VOUCHER(header->msgh_bits)) { m_voucher = header->msgh_voucher_port; header->msgh_voucher_port = MACH_VOUCHER_NULL; header->msgh_bits &= ~(MACH_MSGH_BITS_VOUCHER_MASK | MACH_MSGH_BITS_RAISEIMP); } } ~ImportanceAssertion() { if (m_voucher) { kern_return_t kr = mach_voucher_deallocate(m_voucher); ASSERT_UNUSED(kr, !kr); } } private: mach_voucher_t m_voucher; }; } #endif // PLATFORM(MAC)