75 lines
2 KiB
C++
75 lines
2 KiB
C++
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/*
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* Copyright (c) 2026, Aliaksandr Kalenik <kalenik.aliaksandr@gmail.com>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#include <AK/Format.h>
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#include <LibCore/MachPort.h>
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#include <LibCore/System.h>
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#include <LibIPC/Attachment.h>
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// fileport_makeport() and fileport_makefd() are private macOS APIs that convert
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// between file descriptors and Mach port rights. Since Mach messages can only
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// carry port rights (not file descriptors), we convert FDs to "file ports" for
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// transmission and convert them back on the receiving side. These APIs are stable
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// and used by Apple's own frameworks (including XPC).
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extern "C" {
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int fileport_makeport(int fd, mach_port_t* port);
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int fileport_makefd(mach_port_t port);
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}
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namespace IPC {
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Attachment::Attachment(Attachment&& other)
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: m_port(move(other.m_port))
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, m_message_right(other.m_message_right)
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{
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}
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Attachment& Attachment::operator=(Attachment&& other)
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{
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if (this != &other) {
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m_port = move(other.m_port);
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m_message_right = other.m_message_right;
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}
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return *this;
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}
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Attachment::~Attachment() = default;
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Attachment Attachment::from_fd(int fd)
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{
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mach_port_t port = MACH_PORT_NULL;
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auto result = fileport_makeport(fd, &port);
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(void)Core::System::close(fd);
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VERIFY(result == 0);
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return from_mach_port(Core::MachPort::adopt_right(port, Core::MachPort::PortRight::Send), Core::MachPort::MessageRight::MoveSend);
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}
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int Attachment::to_fd()
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{
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VERIFY(MACH_PORT_VALID(m_port.port()));
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int fd = fileport_makefd(m_port.port());
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VERIFY(fd >= 0);
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mach_port_deallocate(mach_task_self(), m_port.release());
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return fd;
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}
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Attachment Attachment::from_mach_port(Core::MachPort port, Core::MachPort::MessageRight right)
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{
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VERIFY(MACH_PORT_VALID(port.port()));
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Attachment attachment;
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attachment.m_port = move(port);
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attachment.m_message_right = right;
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return attachment;
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}
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Core::MachPort Attachment::release_mach_port()
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{
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VERIFY(MACH_PORT_VALID(m_port.port()));
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return move(m_port);
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}
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}
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