diff options
Diffstat (limited to 'ipc/chromium/src/chrome/common/mach_ipc_mac.mm')
| -rw-r--r-- | ipc/chromium/src/chrome/common/mach_ipc_mac.mm | 351 |
1 files changed, 351 insertions, 0 deletions
diff --git a/ipc/chromium/src/chrome/common/mach_ipc_mac.mm b/ipc/chromium/src/chrome/common/mach_ipc_mac.mm new file mode 100644 index 0000000000..aa18130943 --- /dev/null +++ b/ipc/chromium/src/chrome/common/mach_ipc_mac.mm @@ -0,0 +1,351 @@ +// Copyright (c) 2006-2008 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 "chrome/common/mach_ipc_mac.h" + +#import <Foundation/Foundation.h> + +#include <stdio.h> +#include "base/logging.h" + +//============================================================================== +MachSendMessage::MachSendMessage(int32_t message_id) : MachMessage() { + Initialize(message_id); +} + +MachSendMessage::MachSendMessage(void *storage, size_t storage_length, + int32_t message_id) + : MachMessage(storage, storage_length) { + Initialize(message_id); +} + +void MachSendMessage::Initialize(int32_t message_id) { + Head()->msgh_bits = MACH_MSGH_BITS(MACH_MSG_TYPE_COPY_SEND, 0); + + // head.msgh_remote_port = ...; // filled out in MachPortSender::SendMessage() + Head()->msgh_local_port = MACH_PORT_NULL; + Head()->msgh_reserved = 0; + Head()->msgh_id = 0; + + SetDescriptorCount(0); // start out with no descriptors + + SetMessageID(message_id); + SetData(NULL, 0); // client may add data later +} + +//============================================================================== +MachMessage::MachMessage() + : storage_(new MachMessageData), // Allocate storage_ ourselves + storage_length_bytes_(sizeof(MachMessageData)), + own_storage_(true) { + memset(storage_, 0, storage_length_bytes_); +} + +//============================================================================== +MachMessage::MachMessage(void *storage, size_t storage_length) + : storage_(static_cast<MachMessageData*>(storage)), + storage_length_bytes_(storage_length), + own_storage_(false) { + DCHECK(storage); + DCHECK(storage_length >= kEmptyMessageSize); +} + +//============================================================================== +MachMessage::~MachMessage() { + if (own_storage_) { + delete storage_; + storage_ = NULL; + } +} + + +u_int32_t MachMessage::GetDataLength() { + return EndianU32_LtoN(GetDataPacket()->data_length); +} + + // The message ID may be used as a code identifying the type of message +void MachMessage::SetMessageID(int32_t message_id) { + GetDataPacket()->id = EndianU32_NtoL(message_id); +} + +int32_t MachMessage::GetMessageID() { + return EndianU32_LtoN(GetDataPacket()->id); +} + + +//============================================================================== +// returns true if successful +bool MachMessage::SetData(const void* data, + int32_t data_length) { + // Enforce the fact that it's only safe to call this method once on a + // message. + DCHECK(GetDataPacket()->data_length == 0); + + // first check to make sure we have enough space + int size = CalculateSize(); + int new_size = size + data_length; + + if ((unsigned)new_size > storage_length_bytes_) { + return false; // not enough space + } + + GetDataPacket()->data_length = EndianU32_NtoL(data_length); + if (data) memcpy(GetDataPacket()->data, data, data_length); + + // Update the Mach header with the new aligned size of the message. + CalculateSize(); + + return true; +} + +//============================================================================== +// calculates and returns the total size of the message +// Currently, the entire message MUST fit inside of the MachMessage +// messsage size <= EmptyMessageSize() +int MachMessage::CalculateSize() { + int size = sizeof(mach_msg_header_t) + sizeof(mach_msg_body_t); + + // add space for MessageDataPacket + int32_t alignedDataLength = (GetDataLength() + 3) & ~0x3; + size += 2*sizeof(int32_t) + alignedDataLength; + + // add space for descriptors + size += GetDescriptorCount() * sizeof(MachMsgPortDescriptor); + + Head()->msgh_size = size; + + return size; +} + +//============================================================================== +MachMessage::MessageDataPacket *MachMessage::GetDataPacket() { + int desc_size = sizeof(MachMsgPortDescriptor)*GetDescriptorCount(); + MessageDataPacket *packet = + reinterpret_cast<MessageDataPacket*>(storage_->padding + desc_size); + + return packet; +} + +//============================================================================== +void MachMessage::SetDescriptor(int n, + const MachMsgPortDescriptor &desc) { + MachMsgPortDescriptor *desc_array = + reinterpret_cast<MachMsgPortDescriptor*>(storage_->padding); + desc_array[n] = desc; +} + +//============================================================================== +// returns true if successful otherwise there was not enough space +bool MachMessage::AddDescriptor(const MachMsgPortDescriptor &desc) { + // first check to make sure we have enough space + int size = CalculateSize(); + int new_size = size + sizeof(MachMsgPortDescriptor); + + if ((unsigned)new_size > storage_length_bytes_) { + return false; // not enough space + } + + // unfortunately, we need to move the data to allow space for the + // new descriptor + u_int8_t *p = reinterpret_cast<u_int8_t*>(GetDataPacket()); + bcopy(p, p+sizeof(MachMsgPortDescriptor), GetDataLength()+2*sizeof(int32_t)); + + SetDescriptor(GetDescriptorCount(), desc); + SetDescriptorCount(GetDescriptorCount() + 1); + + CalculateSize(); + + return true; +} + +//============================================================================== +void MachMessage::SetDescriptorCount(int n) { + storage_->body.msgh_descriptor_count = n; + + if (n > 0) { + Head()->msgh_bits |= MACH_MSGH_BITS_COMPLEX; + } else { + Head()->msgh_bits &= ~MACH_MSGH_BITS_COMPLEX; + } +} + +//============================================================================== +MachMsgPortDescriptor *MachMessage::GetDescriptor(int n) { + if (n < GetDescriptorCount()) { + MachMsgPortDescriptor *desc = + reinterpret_cast<MachMsgPortDescriptor*>(storage_->padding); + return desc + n; + } + + return nil; +} + +//============================================================================== +mach_port_t MachMessage::GetTranslatedPort(int n) { + if (n < GetDescriptorCount()) { + return GetDescriptor(n)->GetMachPort(); + } + return MACH_PORT_NULL; +} + +#pragma mark - + +//============================================================================== +// create a new mach port for receiving messages and register a name for it +ReceivePort::ReceivePort(const char *receive_port_name) { + mach_port_t current_task = mach_task_self(); + + init_result_ = mach_port_allocate(current_task, + MACH_PORT_RIGHT_RECEIVE, + &port_); + + if (init_result_ != KERN_SUCCESS) + return; + + init_result_ = mach_port_insert_right(current_task, + port_, + port_, + MACH_MSG_TYPE_MAKE_SEND); + + if (init_result_ != KERN_SUCCESS) + return; + + NSPort *ns_port = [NSMachPort portWithMachPort:port_]; + NSString *port_name = [NSString stringWithUTF8String:receive_port_name]; + [[NSMachBootstrapServer sharedInstance] registerPort:ns_port name:port_name]; +} + +//============================================================================== +// create a new mach port for receiving messages +ReceivePort::ReceivePort() { + mach_port_t current_task = mach_task_self(); + + init_result_ = mach_port_allocate(current_task, + MACH_PORT_RIGHT_RECEIVE, + &port_); + + if (init_result_ != KERN_SUCCESS) + return; + + init_result_ = mach_port_insert_right(current_task, + port_, + port_, + MACH_MSG_TYPE_MAKE_SEND); +} + +//============================================================================== +// Given an already existing mach port, use it. We take ownership of the +// port and deallocate it in our destructor. +ReceivePort::ReceivePort(mach_port_t receive_port) + : port_(receive_port), + init_result_(KERN_SUCCESS) { +} + +//============================================================================== +ReceivePort::~ReceivePort() { + if (init_result_ == KERN_SUCCESS) + mach_port_deallocate(mach_task_self(), port_); +} + +//============================================================================== +kern_return_t ReceivePort::WaitForMessage(MachReceiveMessage *out_message, + mach_msg_timeout_t timeout) { + if (!out_message) { + return KERN_INVALID_ARGUMENT; + } + + // return any error condition encountered in constructor + if (init_result_ != KERN_SUCCESS) + return init_result_; + + out_message->Head()->msgh_bits = 0; + out_message->Head()->msgh_local_port = port_; + out_message->Head()->msgh_remote_port = MACH_PORT_NULL; + out_message->Head()->msgh_reserved = 0; + out_message->Head()->msgh_id = 0; + + kern_return_t result = mach_msg(out_message->Head(), + MACH_RCV_MSG | (timeout == MACH_MSG_TIMEOUT_NONE ? 0 : MACH_RCV_TIMEOUT), + 0, + out_message->MaxSize(), + port_, + timeout, // timeout in ms + MACH_PORT_NULL); + + return result; +} + +//============================================================================== +// send a message to this port +kern_return_t ReceivePort::SendMessageToSelf(MachSendMessage& message, mach_msg_timeout_t timeout) { + if (message.Head()->msgh_size == 0) { + NOTREACHED(); + return KERN_INVALID_VALUE; // just for safety -- never should occur + }; + + if (init_result_ != KERN_SUCCESS) + return init_result_; + + message.Head()->msgh_remote_port = port_; + message.Head()->msgh_bits + = MACH_MSGH_BITS (MACH_MSG_TYPE_MAKE_SEND, + MACH_MSG_TYPE_MAKE_SEND_ONCE); + kern_return_t result = mach_msg(message.Head(), + MACH_SEND_MSG | (timeout == MACH_MSG_TIMEOUT_NONE ? 0 : MACH_SEND_TIMEOUT), + message.Head()->msgh_size, + 0, + MACH_PORT_NULL, + timeout, // timeout in ms + MACH_PORT_NULL); + + return result; + +} + + +#pragma mark - + +//============================================================================== +// get a port with send rights corresponding to a named registered service +MachPortSender::MachPortSender(const char *receive_port_name) { + mach_port_t bootstrap_port = 0; + init_result_ = task_get_bootstrap_port(mach_task_self(), &bootstrap_port); + + if (init_result_ != KERN_SUCCESS) + return; + + init_result_ = bootstrap_look_up(bootstrap_port, + const_cast<char*>(receive_port_name), + &send_port_); +} + +//============================================================================== +MachPortSender::MachPortSender(mach_port_t send_port) + : send_port_(send_port), + init_result_(KERN_SUCCESS) { +} + +//============================================================================== +kern_return_t MachPortSender::SendMessage(MachSendMessage &message, + mach_msg_timeout_t timeout) { + if (message.Head()->msgh_size == 0) { + NOTREACHED(); + return KERN_INVALID_VALUE; // just for safety -- never should occur + }; + + if (init_result_ != KERN_SUCCESS) + return init_result_; + + message.Head()->msgh_remote_port = send_port_; + + kern_return_t result = mach_msg(message.Head(), + MACH_SEND_MSG | (timeout == MACH_MSG_TIMEOUT_NONE ? 0 : MACH_SEND_TIMEOUT), + message.Head()->msgh_size, + 0, + MACH_PORT_NULL, + timeout, // timeout in ms + MACH_PORT_NULL); + + return result; +} |