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/*
* Copyright 2009, Google 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:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * 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.
* * Neither the name of Google Inc. nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND 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 THE COPYRIGHT
* OWNER OR 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 <algorithm>
#include "command_buffer/common/cross/logging.h"
#include "command_buffer/common/cross/rpc_imc.h"
#include "third_party/native_client/googleclient/native_client/src/shared/imc/nacl_htp.h"
namespace o3d {
namespace command_buffer {
int NaclSendData(nacl::HtpHandle channel,
const void *data,
size_t size,
int flags) {
nacl::HtpHeader msg;
nacl::IOVec vec;
vec.base = const_cast<void *>(data);
vec.length = size;
msg.iov = &vec;
msg.iov_length = 1;
msg.handles = NULL;
msg.handle_count = 0;
msg.flags = 0;
return nacl::SendDatagram(channel, &msg, flags);
}
int NaclSendHandles(nacl::HtpHandle channel,
const nacl::HtpHandle *handles,
size_t count,
int flags) {
nacl::HtpHeader msg;
msg.iov = NULL;
msg.iov_length = 0;
msg.handles = const_cast<nacl::HtpHandle *>(handles);
msg.handle_count = count;
msg.flags = 0;
return nacl::SendDatagram(channel, &msg, flags);
}
int NaclReceiveData(nacl::HtpHandle channel,
void *data,
size_t size,
int flags) {
nacl::HtpHeader msg;
nacl::IOVec vec[1];
vec[0].base = data;
vec[0].length = size;
msg.iov = vec;
msg.iov_length = 1;
msg.handles = NULL;
msg.handle_count = 0;
msg.flags = 0;
int result = nacl::ReceiveDatagram(channel, &msg, flags);
return result;
}
int NaclReceiveHandles(nacl::HtpHandle channel,
nacl::HtpHandle *handles,
size_t count,
int flags) {
nacl::HtpHeader msg;
msg.iov = NULL;
msg.iov_length = 0;
msg.handles = handles;
msg.handle_count = count;
msg.flags = 0;
return nacl::ReceiveDatagram(channel, &msg, flags);
}
struct RPCMessageHeader {
int message_id;
size_t size;
size_t handle_count;
};
RPCImplInterface::ReturnValue IMCSender::SendCall(
int message_id,
const void * data,
size_t size,
RPCHandle const *handles,
size_t handle_count) {
// Send 3 messages: first contains message id, and data size, second
// contains data and third handles.
// The reason for that is to have the size first so that we can allocate the
// data buffer on the receiving side.
RPCMessageHeader msg = {message_id, size, handle_count};
int result = NaclSendData(handle_, &msg, sizeof(msg), 0);
DCHECK_NE(-1, result);
if (size > 0) {
result = NaclSendData(handle_, data, size, 0);
DCHECK_NE(-1, result);
}
if (handle_count > 0) {
result = NaclSendHandles(handle_, handles, handle_count, 0);
DCHECK_NE(-1, result);
}
RPCImplInterface::ReturnValue ret;
result = NaclReceiveData(handle_, &ret, sizeof(ret), 0);
DCHECK_EQ(sizeof(ret), result);
return ret;
}
bool IMCMessageProcessor::GetMessageIDSize(bool wait) {
if (has_message_) return true;
RPCMessageHeader msg = {0};
int result = NaclReceiveData(handle_, &msg, sizeof(msg),
wait ? 0 : nacl::kDontWait);
if (result != sizeof(msg)) {
if (result >=0 || wait || !nacl::WouldBlock()) return false;
has_message_ = false;
} else {
incoming_message_id_ = msg.message_id;
incoming_message_size_ = msg.size;
incoming_message_handles_ = msg.handle_count;
has_message_ = true;
}
return true;
}
bool IMCMessageProcessor::ProcessMessage() {
if (!GetMessageIDSize(true)) return false;
if (incoming_message_size_ > 0) {
if (incoming_message_size_ > data_size_) {
data_size_ = incoming_message_size_;
data_.reset(new char[incoming_message_size_]);
}
int result = NaclReceiveData(handle_, data_.get(), incoming_message_size_,
0);
if (result < 0) return false;
}
if (incoming_message_handles_ > 0) {
if (incoming_message_handles_ > handle_count_) {
handle_count_ = incoming_message_handles_;
handles_.reset(new nacl::HtpHandle[incoming_message_handles_]);
}
int result = NaclReceiveHandles(handle_, handles_.get(),
incoming_message_handles_, 0);
if (result < 0) return false;
}
has_message_ = false;
RPCImplInterface::ReturnValue retval = 0;
bool continue_processing = true;
if (incoming_message_id_ == POISONED_MESSAGE_ID) {
continue_processing = false;
} else {
retval = impl_->DoCall(incoming_message_id_, data_.get(),
incoming_message_size_, handles_.get(),
incoming_message_handles_);
// Note: the handles that got received are a "copy" of the original handle,
// so they need to be closed eventually. It's hard to impose an
// "ownership" policy onto the RPCImplInterface, because it makes the API
// very clunky. Currently, we only pass handles across for
// RegisterSharedMemory, and so we can safely close the handle immediately
// (the memory will stay mapped).
// TODO: Fix this. Possibly using a global registration mechanism
// and ref-counting would make it work nicely.
for (unsigned int i = 0; i < incoming_message_handles_; ++i) {
nacl::Close(handles_[i]);
}
}
int result = NaclSendData(handle_, &retval, sizeof(retval), 0);
if (result < 0) return false;
return continue_processing;
}
bool IMCMessageProcessor::HasMessage() {
GetMessageIDSize(false);
return has_message_;
}
RPCSendInterface *MakeSendInterface(RPCSocketHandle handle) {
return new IMCSender(handle);
}
RPCShmHandle CreateShm(size_t size) {
size = (size + nacl::kMapPageSize - 1) & ~(nacl::kMapPageSize - 1);
nacl::Handle nacl_handle = nacl::CreateMemoryObject(size);
return nacl_handle == nacl::kInvalidHandle ? kRPCInvalidHandle :
nacl::CreateShmDesc(nacl_handle, size);
}
void DestroyShm(RPCShmHandle handle) {
nacl::Close(handle);
}
void *MapShm(RPCShmHandle handle, size_t size) {
size = (size + nacl::kMapPageSize - 1) & ~(nacl::kMapPageSize - 1);
void *address = nacl::Map(NULL, size, nacl::kProtRead | nacl::kProtWrite,
nacl::kMapShared, handle, 0);
return address == nacl::kMapFailed ? NULL : address;
}
void UnmapShm(void *address, size_t size) {
size = (size + nacl::kMapPageSize - 1) & ~(nacl::kMapPageSize - 1);
nacl::Unmap(address, size);
}
} // namespace command_buffer
} // namespace o3d
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