/* * Copyright (C) 2010 Apple Inc. All rights reserved. * Copyright (c) 2010 University of Szeged * Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies) * * 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. */ #include "config.h" #if USE(UNIX_DOMAIN_SOCKETS) #include "SharedMemory.h" #include "ArgumentDecoder.h" #include "ArgumentEncoder.h" #include #include #include #include #include #include #include #include #include #include #include #include #if OS(ANDROID) #include #endif namespace WebKit { SharedMemory::Handle::Handle() : m_fileDescriptor(-1) , m_size(0) { } SharedMemory::Handle::~Handle() { if (!isNull()) closeWithRetry(m_fileDescriptor); } bool SharedMemory::Handle::isNull() const { return m_fileDescriptor == -1; } void SharedMemory::Handle::encode(CoreIPC::ArgumentEncoder& encoder) const { encoder << releaseToAttachment(); } bool SharedMemory::Handle::decode(CoreIPC::ArgumentDecoder& decoder, Handle& handle) { ASSERT_ARG(handle, !handle.m_size); ASSERT_ARG(handle, handle.isNull()); CoreIPC::Attachment attachment; if (!decoder.decode(attachment)) return false; handle.adoptFromAttachment(attachment.releaseFileDescriptor(), attachment.size()); return true; } CoreIPC::Attachment SharedMemory::Handle::releaseToAttachment() const { int temp = m_fileDescriptor; m_fileDescriptor = -1; return CoreIPC::Attachment(temp, m_size); } void SharedMemory::Handle::adoptFromAttachment(int fileDescriptor, size_t size) { ASSERT(!m_size); ASSERT(isNull()); m_fileDescriptor = fileDescriptor; m_size = size; } #if OS(ANDROID) PassRefPtr SharedMemory::create(size_t size) { int fileDescriptor = open("/dev/ashmem", O_RDWR); if (fileDescriptor < 0) { WTFLogAlways("Failed to open ashmem device"); return 0; } String name = String("/WK2SharedMemory.") + String::number(static_cast(WTF::randomNumber() * (std::numeric_limits::max() + 1.0))); char buf[ASHMEM_NAME_LEN]; strlcpy(buf,name.utf8().data(), sizeof(buf)); // Ashmem names does not need to be unique. ioctl(fileDescriptor, ASHMEM_SET_NAME, buf); int ret = ioctl(fileDescriptor, ASHMEM_SET_SIZE, size); if (ret < 0) { closeWithRetry(fileDescriptor); WTFLogAlways("Failed to create shared memory of size %d", size); return 0; } void* data = mmap(0, size, PROT_READ | PROT_WRITE, MAP_SHARED, fileDescriptor, 0); if (data == MAP_FAILED) { closeWithRetry(fileDescriptor); return 0; } RefPtr instance = adoptRef(new SharedMemory()); instance->m_data = data; instance->m_fileDescriptor = fileDescriptor; instance->m_size = size; return instance.release(); } #else PassRefPtr SharedMemory::create(size_t size) { CString tempName; int fileDescriptor = -1; for (int tries = 0; fileDescriptor == -1 && tries < 10; ++tries) { String name = String("/WK2SharedMemory.") + String::number(static_cast(WTF::randomNumber() * (std::numeric_limits::max() + 1.0))); tempName = name.utf8(); do { fileDescriptor = shm_open(tempName.data(), O_CREAT | O_CLOEXEC | O_RDWR, S_IRUSR | S_IWUSR); } while (fileDescriptor == -1 && errno == EINTR); } if (fileDescriptor == -1) { WTFLogAlways("Failed to create shared memory file %s", tempName.data()); return 0; } while (ftruncate(fileDescriptor, size) == -1) { if (errno != EINTR) { closeWithRetry(fileDescriptor); shm_unlink(tempName.data()); return 0; } } void* data = mmap(0, size, PROT_READ | PROT_WRITE, MAP_SHARED, fileDescriptor, 0); if (data == MAP_FAILED) { closeWithRetry(fileDescriptor); shm_unlink(tempName.data()); return 0; } shm_unlink(tempName.data()); RefPtr instance = adoptRef(new SharedMemory()); instance->m_data = data; instance->m_fileDescriptor = fileDescriptor; instance->m_size = size; return instance.release(); } #endif static inline int accessModeMMap(SharedMemory::Protection protection) { switch (protection) { case SharedMemory::ReadOnly: return PROT_READ; case SharedMemory::ReadWrite: return PROT_READ | PROT_WRITE; } ASSERT_NOT_REACHED(); return PROT_READ | PROT_WRITE; } PassRefPtr SharedMemory::create(const Handle& handle, Protection protection) { ASSERT(!handle.isNull()); void* data = mmap(0, handle.m_size, accessModeMMap(protection), MAP_SHARED, handle.m_fileDescriptor, 0); if (data == MAP_FAILED) return 0; RefPtr instance = adoptRef(new SharedMemory()); instance->m_data = data; instance->m_fileDescriptor = handle.m_fileDescriptor; instance->m_size = handle.m_size; handle.m_fileDescriptor = -1; return instance; } SharedMemory::~SharedMemory() { munmap(m_data, m_size); closeWithRetry(m_fileDescriptor); } static inline int accessModeFile(SharedMemory::Protection protection) { switch (protection) { case SharedMemory::ReadOnly: return O_RDONLY; case SharedMemory::ReadWrite: return O_RDWR; } ASSERT_NOT_REACHED(); return O_RDWR; } bool SharedMemory::createHandle(Handle& handle, Protection protection) { ASSERT_ARG(handle, !handle.m_size); ASSERT_ARG(handle, handle.isNull()); int duplicatedHandle; while ((duplicatedHandle = dup(m_fileDescriptor)) == -1) { if (errno != EINTR) { ASSERT_NOT_REACHED(); return false; } } while ((fcntl(duplicatedHandle, F_SETFD, FD_CLOEXEC | accessModeFile(protection)) == -1)) { if (errno != EINTR) { ASSERT_NOT_REACHED(); closeWithRetry(duplicatedHandle); return false; } } handle.m_fileDescriptor = duplicatedHandle; handle.m_size = m_size; return true; } unsigned SharedMemory::systemPageSize() { static unsigned pageSize = 0; if (!pageSize) pageSize = getpagesize(); return pageSize; } } // namespace WebKit #endif