| // Copyright (c) 2012 The Chromium Authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style license that can be |
| // found in the LICENSE file. |
| |
| #include "ipc/ipc_message.h" |
| |
| #include "base/atomicops.h" |
| #include "base/logging.h" |
| #include "build/build_config.h" |
| |
| #if defined(OS_POSIX) |
| #include "ipc/file_descriptor_set_posix.h" |
| #endif |
| |
| namespace { |
| |
| base::subtle::Atomic32 g_ref_num = 0; |
| |
| // Create a reference number for identifying IPC messages in traces. The return |
| // values has the reference number stored in the upper 24 bits, leaving the low |
| // 8 bits set to 0 for use as flags. |
| inline uint32 GetRefNumUpper24() { |
| base::debug::TraceLog* trace_log = base::debug::TraceLog::GetInstance(); |
| int32 pid = trace_log ? trace_log->process_id() : 0; |
| int32 count = base::subtle::NoBarrier_AtomicIncrement(&g_ref_num, 1); |
| // The 24 bit hash is composed of 14 bits of the count and 10 bits of the |
| // Process ID. With the current trace event buffer cap, the 14-bit count did |
| // not appear to wrap during a trace. Note that it is not a big deal if |
| // collisions occur, as this is only used for debugging and trace analysis. |
| return ((pid << 14) | (count & 0x3fff)) << 8; |
| } |
| |
| } // namespace |
| |
| namespace IPC { |
| |
| //------------------------------------------------------------------------------ |
| |
| Message::~Message() { |
| } |
| |
| Message::Message() |
| : Pickle(sizeof(Header)) { |
| header()->routing = header()->type = 0; |
| header()->flags = GetRefNumUpper24(); |
| #if defined(OS_POSIX) |
| header()->num_fds = 0; |
| header()->pad = 0; |
| #endif |
| InitLoggingVariables(); |
| } |
| |
| Message::Message(int32 routing_id, uint32 type, PriorityValue priority) |
| : Pickle(sizeof(Header)) { |
| header()->routing = routing_id; |
| header()->type = type; |
| DCHECK((priority & 0xffffff00) == 0); |
| header()->flags = priority | GetRefNumUpper24(); |
| #if defined(OS_POSIX) |
| header()->num_fds = 0; |
| header()->pad = 0; |
| #endif |
| InitLoggingVariables(); |
| } |
| |
| Message::Message(const char* data, int data_len) : Pickle(data, data_len) { |
| InitLoggingVariables(); |
| } |
| |
| Message::Message(const Message& other) : Pickle(other) { |
| InitLoggingVariables(); |
| #if defined(OS_POSIX) |
| file_descriptor_set_ = other.file_descriptor_set_; |
| #endif |
| } |
| |
| void Message::InitLoggingVariables() { |
| #ifdef IPC_MESSAGE_LOG_ENABLED |
| received_time_ = 0; |
| dont_log_ = false; |
| log_data_ = NULL; |
| #endif |
| } |
| |
| Message& Message::operator=(const Message& other) { |
| *static_cast<Pickle*>(this) = other; |
| #if defined(OS_POSIX) |
| file_descriptor_set_ = other.file_descriptor_set_; |
| #endif |
| return *this; |
| } |
| |
| void Message::SetHeaderValues(int32 routing, uint32 type, uint32 flags) { |
| // This should only be called when the message is already empty. |
| DCHECK(payload_size() == 0); |
| |
| header()->routing = routing; |
| header()->type = type; |
| header()->flags = flags; |
| } |
| |
| #ifdef IPC_MESSAGE_LOG_ENABLED |
| void Message::set_sent_time(int64 time) { |
| DCHECK((header()->flags & HAS_SENT_TIME_BIT) == 0); |
| header()->flags |= HAS_SENT_TIME_BIT; |
| WriteInt64(time); |
| } |
| |
| int64 Message::sent_time() const { |
| if ((header()->flags & HAS_SENT_TIME_BIT) == 0) |
| return 0; |
| |
| const char* data = end_of_payload(); |
| data -= sizeof(int64); |
| return *(reinterpret_cast<const int64*>(data)); |
| } |
| |
| void Message::set_received_time(int64 time) const { |
| received_time_ = time; |
| } |
| #endif |
| |
| #if defined(OS_POSIX) |
| bool Message::WriteFileDescriptor(const base::FileDescriptor& descriptor) { |
| // We write the index of the descriptor so that we don't have to |
| // keep the current descriptor as extra decoding state when deserialising. |
| WriteInt(file_descriptor_set()->size()); |
| if (descriptor.auto_close) { |
| return file_descriptor_set()->AddAndAutoClose(descriptor.fd); |
| } else { |
| return file_descriptor_set()->Add(descriptor.fd); |
| } |
| } |
| |
| bool Message::ReadFileDescriptor(PickleIterator* iter, |
| base::FileDescriptor* descriptor) const { |
| int descriptor_index; |
| if (!ReadInt(iter, &descriptor_index)) |
| return false; |
| |
| FileDescriptorSet* file_descriptor_set = file_descriptor_set_.get(); |
| if (!file_descriptor_set) |
| return false; |
| |
| descriptor->fd = file_descriptor_set->GetDescriptorAt(descriptor_index); |
| descriptor->auto_close = true; |
| |
| return descriptor->fd >= 0; |
| } |
| |
| bool Message::HasFileDescriptors() const { |
| return file_descriptor_set_.get() && !file_descriptor_set_->empty(); |
| } |
| |
| void Message::EnsureFileDescriptorSet() { |
| if (file_descriptor_set_.get() == NULL) |
| file_descriptor_set_ = new FileDescriptorSet; |
| } |
| |
| #endif |
| |
| } // namespace IPC |