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- /*
- * Copyright (c) 2024, Andrew Kaster <akaster@serenityos.org>
- *
- * SPDX-License-Identifier: BSD-2-Clause
- */
- #include "MachPortServer.h"
- #include <AK/Debug.h>
- #include <LibCore/Platform/MachMessageTypes.h>
- #include <LibCore/Platform/ProcessStatisticsMach.h>
- namespace Ladybird {
- MachPortServer::MachPortServer()
- : m_thread(Threading::Thread::construct([this]() -> intptr_t { thread_loop(); return 0; }, "MachPortServer"sv))
- , m_server_port_name(ByteString::formatted("org.ladybird.Ladybird.helper.{}", getpid()))
- {
- if (auto err = allocate_server_port(); err.is_error())
- dbgln("Failed to allocate server port: {}", err.error());
- else
- start();
- }
- MachPortServer::~MachPortServer()
- {
- stop();
- }
- void MachPortServer::start()
- {
- m_thread->start();
- }
- void MachPortServer::stop()
- {
- // FIXME: We should join instead (after storing should_stop = false) when we have a way to interrupt the thread's mach_msg call
- m_thread->detach();
- m_should_stop.store(true, MemoryOrder::memory_order_release);
- }
- bool MachPortServer::is_initialized()
- {
- return MACH_PORT_VALID(m_server_port_recv_right.port()) && MACH_PORT_VALID(m_server_port_send_right.port());
- }
- ErrorOr<void> MachPortServer::allocate_server_port()
- {
- m_server_port_recv_right = TRY(Core::MachPort::create_with_right(Core::MachPort::PortRight::Receive));
- m_server_port_send_right = TRY(m_server_port_recv_right.insert_right(Core::MachPort::MessageRight::MakeSend));
- TRY(m_server_port_recv_right.register_with_bootstrap_server(m_server_port_name));
- dbgln_if(MACH_PORT_DEBUG, "Success! we created and attached mach port {:x} to bootstrap server with name {}", m_server_port_recv_right.port(), m_server_port_name);
- return {};
- }
- void MachPortServer::thread_loop()
- {
- while (!m_should_stop.load(MemoryOrder::memory_order_acquire)) {
- Core::Platform::ReceivedMachMessage message {};
- // Get the pid of the child from the audit trailer so we can associate the port w/it
- mach_msg_options_t const options = MACH_RCV_MSG | MACH_RCV_TRAILER_TYPE(MACH_RCV_TRAILER_AUDIT) | MACH_RCV_TRAILER_ELEMENTS(MACH_RCV_TRAILER_AUDIT);
- // FIXME: How can we interrupt this call during application shutdown?
- auto const ret = mach_msg(&message.header, options, 0, sizeof(message), m_server_port_recv_right.port(), MACH_MSG_TIMEOUT_NONE, MACH_PORT_NULL);
- if (ret != KERN_SUCCESS) {
- dbgln("mach_msg failed: {}", mach_error_string(ret));
- break;
- }
- if (message.header.msgh_id == Core::Platform::BACKING_STORE_IOSURFACES_MESSAGE_ID) {
- auto pid = static_cast<pid_t>(message.body.parent_iosurface.trailer.msgh_audit.val[5]);
- auto const& backing_stores_message = message.body.parent_iosurface;
- auto front_child_port = Core::MachPort::adopt_right(backing_stores_message.front_descriptor.name, Core::MachPort::PortRight::Send);
- auto back_child_port = Core::MachPort::adopt_right(backing_stores_message.back_descriptor.name, Core::MachPort::PortRight::Send);
- auto const& metadata = backing_stores_message.metadata;
- if (on_receive_backing_stores)
- on_receive_backing_stores({ .pid = pid,
- .page_id = metadata.page_id,
- .front_backing_store_id = metadata.front_backing_store_id,
- .back_backing_store_id = metadata.back_backing_store_id,
- .front_backing_store_port = move(front_child_port),
- .back_backing_store_port = move(back_child_port) });
- continue;
- }
- if (message.header.msgh_id == Core::Platform::SELF_TASK_PORT_MESSAGE_ID) {
- if (MACH_MSGH_BITS_LOCAL(message.header.msgh_bits) != MACH_MSG_TYPE_MOVE_SEND) {
- dbgln("Received message with invalid local port rights {}, ignoring", MACH_MSGH_BITS_LOCAL(message.header.msgh_bits));
- continue;
- }
- auto const& task_port_message = message.body.parent;
- auto pid = static_cast<pid_t>(task_port_message.trailer.msgh_audit.val[5]);
- auto child_port = Core::MachPort::adopt_right(task_port_message.port_descriptor.name, Core::MachPort::PortRight::Send);
- dbgln_if(MACH_PORT_DEBUG, "Received child port {:x} from pid {}", child_port.port(), pid);
- if (on_receive_child_mach_port)
- on_receive_child_mach_port(pid, move(child_port));
- continue;
- }
- dbgln("Received message with id {}, ignoring", message.header.msgh_id);
- }
- }
- }
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