mirror of
https://github.com/RGBCube/serenity
synced 2025-05-31 05:08:13 +00:00
bad6d50b86
This change lays the foundation for making the require_promise return an error hand handling the process abort outside of the syscall implementations, to avoid cases where we would leak resources. It also has the advantage that it makes removes a gs pointer read to look up the current thread, then process for every syscall. We can instead go through the Process this pointer in most cases.
138 lines
3.7 KiB
C++
138 lines
3.7 KiB
C++
/*
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* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#include <Kernel/API/POSIX/errno.h>
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#include <Kernel/Arch/x86/InterruptDisabler.h>
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#include <Kernel/Debug.h>
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#include <Kernel/Process.h>
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#include <Kernel/TTY/MasterPTY.h>
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#include <Kernel/TTY/PTYMultiplexer.h>
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#include <Kernel/TTY/SlavePTY.h>
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#include <LibC/signal_numbers.h>
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#include <LibC/sys/ioctl_numbers.h>
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namespace Kernel {
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ErrorOr<NonnullRefPtr<MasterPTY>> MasterPTY::try_create(unsigned int index)
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{
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auto pts_name = TRY(KString::formatted("/dev/pts/{}", index));
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auto tty_name = TRY(pts_name->try_clone());
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auto buffer = TRY(DoubleBuffer::try_create());
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auto master_pty = TRY(adopt_nonnull_ref_or_enomem(new (nothrow) MasterPTY(index, move(buffer), move(pts_name))));
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auto slave_pty = TRY(adopt_nonnull_ref_or_enomem(new (nothrow) SlavePTY(*master_pty, index, move(tty_name))));
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master_pty->m_slave = slave_pty;
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master_pty->after_inserting();
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slave_pty->after_inserting();
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return master_pty;
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}
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MasterPTY::MasterPTY(unsigned index, NonnullOwnPtr<DoubleBuffer> buffer, NonnullOwnPtr<KString> pts_name)
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: CharacterDevice(200, index)
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, m_index(index)
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, m_buffer(move(buffer))
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, m_pts_name(move(pts_name))
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{
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auto& process = Process::current();
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set_uid(process.uid());
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set_gid(process.gid());
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m_buffer->set_unblock_callback([this]() {
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if (m_slave)
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evaluate_block_conditions();
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});
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}
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MasterPTY::~MasterPTY()
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{
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dbgln_if(MASTERPTY_DEBUG, "~MasterPTY({})", m_index);
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PTYMultiplexer::the().notify_master_destroyed({}, m_index);
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}
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KString const& MasterPTY::pts_name() const
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{
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return *m_pts_name;
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}
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ErrorOr<size_t> MasterPTY::read(OpenFileDescription&, u64, UserOrKernelBuffer& buffer, size_t size)
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{
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if (!m_slave && m_buffer->is_empty())
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return 0;
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return m_buffer->read(buffer, size);
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}
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ErrorOr<size_t> MasterPTY::write(OpenFileDescription&, u64, const UserOrKernelBuffer& buffer, size_t size)
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{
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if (!m_slave)
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return EIO;
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m_slave->on_master_write(buffer, size);
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return size;
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}
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bool MasterPTY::can_read(const OpenFileDescription&, size_t) const
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{
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if (!m_slave)
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return true;
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return !m_buffer->is_empty();
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}
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bool MasterPTY::can_write(const OpenFileDescription&, size_t) const
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{
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return true;
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}
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void MasterPTY::notify_slave_closed(Badge<SlavePTY>)
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{
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dbgln_if(MASTERPTY_DEBUG, "MasterPTY({}): slave closed, my retains: {}, slave retains: {}", m_index, ref_count(), m_slave->ref_count());
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// +1 ref for my MasterPTY::m_slave
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// +1 ref for OpenFileDescription::m_device
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if (m_slave->ref_count() == 2)
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m_slave = nullptr;
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}
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ErrorOr<size_t> MasterPTY::on_slave_write(const UserOrKernelBuffer& data, size_t size)
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{
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if (m_closed)
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return EIO;
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return m_buffer->write(data, size);
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}
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bool MasterPTY::can_write_from_slave() const
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{
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if (m_closed)
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return true;
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return m_buffer->space_for_writing();
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}
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ErrorOr<void> MasterPTY::close()
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{
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InterruptDisabler disabler;
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// After the closing OpenFileDescription dies, slave is the only thing keeping me alive.
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// From this point, let's consider ourselves closed.
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m_closed = true;
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if (m_slave)
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m_slave->hang_up();
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return {};
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}
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ErrorOr<void> MasterPTY::ioctl(OpenFileDescription& description, unsigned request, Userspace<void*> arg)
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{
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Process::current().require_promise(Pledge::tty);
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if (!m_slave)
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return EIO;
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if (request == TIOCSWINSZ || request == TIOCGPGRP)
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return m_slave->ioctl(description, request, arg);
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return EINVAL;
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}
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ErrorOr<NonnullOwnPtr<KString>> MasterPTY::pseudo_path(const OpenFileDescription&) const
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{
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return KString::formatted("ptm:{}", m_pts_name);
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}
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}
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