bool SharedMemory::createHandle(Handle& handle, Protection)
{
ASSERT_ARG(handle, !handle.m_size);
ASSERT_ARG(handle, handle.isNull());
// FIXME: Handle the case where the passed Protection is ReadOnly.
// See https://bugs.webkit.org/show_bug.cgi?id=131542.
int duplicatedHandle;
while ((duplicatedHandle = dup(m_fileDescriptor)) == -1) {
if (errno != EINTR) {
ASSERT_NOT_REACHED();
return false;
}
}
while (fcntl(duplicatedHandle, F_SETFD, FD_CLOEXEC) == -1) {
if (errno != EINTR) {
ASSERT_NOT_REACHED();
closeWithRetry(duplicatedHandle);
return false;
}
}
handle.m_fileDescriptor = duplicatedHandle;
handle.m_size = m_size;
return true;
}
SharedMemory::~SharedMemory()
{
if (m_isWrappingMap)
return;
munmap(m_data, m_size);
if (m_fileDescriptor)
closeWithRetry(m_fileDescriptor.value());
}
RefPtr<SharedMemory> SharedMemory::create(void* address, size_t size, Protection protection)
{
CString tempName;
int fileDescriptor = -1;
for (int tries = 0; fileDescriptor == -1 && tries < 10; ++tries) {
String name = String("/WK2SharedMemory.") + String::number(static_cast<unsigned>(WTF::randomNumber() * (std::numeric_limits<unsigned>::max() + 1.0)));
tempName = name.utf8();
do {
fileDescriptor = shm_open(tempName.data(), O_CREAT | O_RDWR, S_IRUSR | S_IWUSR);
} while (fileDescriptor == -1 && errno == EINTR);
}
if (fileDescriptor == -1) {
WTFLogAlways("Failed to create shared memory file %s: %s", tempName.data(), strerror(errno));
return 0;
}
while (ftruncate(fileDescriptor, size) == -1) {
if (errno != EINTR) {
closeWithRetry(fileDescriptor);
shm_unlink(tempName.data());
return 0;
}
}
void* data = mmap(address, size, accessModeMMap(protection), MAP_SHARED, fileDescriptor, 0);
if (data == MAP_FAILED) {
closeWithRetry(fileDescriptor);
shm_unlink(tempName.data());
return 0;
}
shm_unlink(tempName.data());
RefPtr<SharedMemory> instance = adoptRef(new SharedMemory());
instance->m_data = data;
instance->m_fileDescriptor = fileDescriptor;
instance->m_size = size;
return instance.release();
}
RefPtr<SharedMemory> SharedMemory::map(const Handle& handle, Protection protection)
{
ASSERT(!handle.isNull());
int fd = handle.m_attachment.releaseFileDescriptor();
void* data = mmap(0, handle.m_attachment.size(), accessModeMMap(protection), MAP_SHARED, fd, 0);
closeWithRetry(fd);
if (data == MAP_FAILED)
return nullptr;
RefPtr<SharedMemory> instance = wrapMap(data, handle.m_attachment.size(), -1);
instance->m_fileDescriptor = std::nullopt;
instance->m_isWrappingMap = false;
return instance;
}
void Connection::platformInvalidate()
{
// In GTK+ platform the socket is closed by the work queue.
#if !PLATFORM(GTK)
if (m_socketDescriptor != -1)
closeWithRetry(m_socketDescriptor);
#endif
if (!m_isConnected)
return;
#if PLATFORM(GTK) || PLATFORM(EFL)
m_connectionQueue->unregisterSocketEventHandler(m_socketDescriptor);
#endif
m_socketDescriptor = -1;
m_isConnected = false;
}
void SharedMemory::Handle::clear()
{
if (!isNull())
closeWithRetry(m_fileDescriptor);
}
SharedMemory::~SharedMemory()
{
munmap(m_data, m_size);
closeWithRetry(m_fileDescriptor);
}
