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/*
* Copyright (C) 2010 Apple Inc. All rights reserved.
* Portions Copyright (c) 2010 Motorola Mobility, 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.
*/
#include "Connection.h"
#include "ArgumentEncoder.h"
#include "WorkItem.h"
#include <errno.h>
#include <glib.h>
#include <sys/fcntl.h>
using namespace std;
namespace CoreIPC {
static const size_t initialMessageBufferSize = 4096;
static int readBytesFromSocket(int fileDescriptor, uint8_t* ptr, size_t length)
{
ASSERT(fileDescriptor > 0);
ASSERT(buffer);
ASSERT(length > 0);
ssize_t numberOfBytesRead = 0;
size_t pendingBytesToRead = length;
uint8_t* buffer = ptr;
while (pendingBytesToRead > 0) {
if ((numberOfBytesRead = read(fileDescriptor, buffer, pendingBytesToRead)) < 0) {
if (errno == EINTR)
numberOfBytesRead = 0;
else if (errno == EAGAIN || errno == EWOULDBLOCK)
break;
else
return 0;
} else if (!numberOfBytesRead)
break;
buffer += numberOfBytesRead;
pendingBytesToRead -= numberOfBytesRead;
}
return (length - pendingBytesToRead);
}
static bool writeBytesToSocket(int fileDescriptor, uint8_t* ptr, size_t length)
{
ASSERT(fileDescriptor > 0);
ASSERT(buffer);
ASSERT(length > 0);
ssize_t numberOfBytesWritten = 0;
size_t pendingBytesToWrite = length;
uint8_t* buffer = ptr;
// Keep writing to the socket till the complete message has been written.
while (pendingBytesToWrite > 0) {
if ((numberOfBytesWritten = write(fileDescriptor, buffer, pendingBytesToWrite)) < 0) {
if (errno == EINTR)
numberOfBytesWritten = 0;
else
return false;
}
buffer += numberOfBytesWritten;
pendingBytesToWrite -= numberOfBytesWritten;
}
// Write operation failed if complete message is not written.
return !pendingBytesToWrite;
}
void Connection::platformInitialize(Identifier identifier)
{
m_currentMessageSize = 0;
m_pendingBytes = 0;
m_readBuffer.resize(initialMessageBufferSize);
m_socket = identifier;
m_isConnected = true;
}
void Connection::platformInvalidate()
{
if (!m_isConnected)
return;
m_connectionQueue.unregisterEventSourceHandler(m_socket);
if (m_socket > 0) {
close(m_socket);
m_socket = -1;
}
m_isConnected = false;
}
void Connection::processCompletedMessage()
{
size_t realBufferSize = m_currentMessageSize - sizeof(MessageID);
unsigned messageID = *reinterpret_cast<unsigned*>(m_readBuffer.data() + realBufferSize);
processIncomingMessage(MessageID::fromInt(messageID), adoptPtr(new ArgumentDecoder(m_readBuffer.data(), realBufferSize)));
// Prepare for the next message.
m_currentMessageSize = 0;
m_pendingBytes = 0;
}
void Connection::readEventHandler()
{
if (m_socket < 0)
return;
// Handle any previously unprocessed message.
if (!messageProcessingCompleted()) {
if ((m_pendingBytes -= readBytesFromSocket(m_socket, (m_readBuffer.data() + (m_currentMessageSize - m_pendingBytes)), m_pendingBytes)) > 0)
return;
// Message received completely. Process the message now.
processCompletedMessage();
}
// Prepare to read the next message.
uint8_t sizeBuffer[sizeof(size_t)];
memset(sizeBuffer, 0, sizeof(size_t));
while (messageProcessingCompleted()) {
if (readBytesFromSocket(m_socket, sizeBuffer, sizeof(size_t)))
m_currentMessageSize = *reinterpret_cast<size_t*>(sizeBuffer);
if (!m_currentMessageSize)
break;
if (m_readBuffer.size() < m_currentMessageSize)
m_readBuffer.grow(m_currentMessageSize);
m_pendingBytes = m_currentMessageSize - readBytesFromSocket(m_socket, m_readBuffer.data(), m_currentMessageSize);
if (m_pendingBytes > 0) // Message partially received.
break;
// Message received completely. Process the message now.
processCompletedMessage();
memset(sizeBuffer, 0, sizeof(size_t));
}
}
bool Connection::open()
{
int flags = fcntl(m_socket, F_GETFL, 0);
fcntl(m_socket, F_SETFL, flags | O_NONBLOCK);
// Register callbacks for connection termination and input data on the WorkQueue.
m_connectionQueue.registerEventSourceHandler(m_socket, (G_IO_HUP | G_IO_ERR), WorkItem::create(this, &Connection::connectionDidClose));
m_connectionQueue.registerEventSourceHandler(m_socket, G_IO_IN, WorkItem::create(this, &Connection::readEventHandler));
return true;
}
bool Connection::platformCanSendOutgoingMessages() const
{
return (m_socket > 0);
}
bool Connection::sendOutgoingMessage(MessageID messageID, PassOwnPtr<ArgumentEncoder> arguments)
{
if (m_socket < 0)
return false;
// We put the message ID last.
arguments->encodeUInt32(messageID.toInt());
size_t bufferSize = arguments->bufferSize();
// Send the message size first.
if (!writeBytesToSocket(m_socket, reinterpret_cast<uint8_t*>(&bufferSize), sizeof(size_t)))
return false;
if (!writeBytesToSocket(m_socket, arguments->buffer(), arguments->bufferSize()))
return false;
return true;
}
} // namespace CoreIPC
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