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d1371d66f7
This patch switches away from {Nonnull,}LockRefPtr to the non-locking
smart pointers throughout the kernel.
I've looked at the handful of places where these were being persisted
and I don't see any race situations.
Note that the process file descriptor table (Process::m_fds) was already
guarded via MutexProtected.
67 lines
1.8 KiB
C++
67 lines
1.8 KiB
C++
/*
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* Copyright (c) 2022, Liav A. <liavalb@hotmail.co.il>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#include <Kernel/Devices/DeviceManagement.h>
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#include <Kernel/Devices/SelfTTYDevice.h>
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#include <Kernel/Sections.h>
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#include <Kernel/TTY/TTY.h>
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namespace Kernel {
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UNMAP_AFTER_INIT NonnullLockRefPtr<SelfTTYDevice> SelfTTYDevice::must_create()
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{
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auto self_tty_device_or_error = DeviceManagement::try_create_device<SelfTTYDevice>();
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// FIXME: Find a way to propagate errors
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VERIFY(!self_tty_device_or_error.is_error());
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return self_tty_device_or_error.release_value();
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}
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ErrorOr<NonnullRefPtr<OpenFileDescription>> SelfTTYDevice::open(int options)
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{
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// Note: If for some odd reason we try to open this device (early on boot?)
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// while there's no current Process assigned, don't fail and return an error.
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if (!Process::has_current())
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return Error::from_errno(ESRCH);
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auto& current_process = Process::current();
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LockRefPtr<TTY> tty = current_process.tty();
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if (!tty)
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return Error::from_errno(ENXIO);
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auto description = TRY(OpenFileDescription::try_create(*tty));
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description->set_rw_mode(options);
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description->set_file_flags(options);
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return description;
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}
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bool SelfTTYDevice::can_read(OpenFileDescription const&, u64) const
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{
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VERIFY_NOT_REACHED();
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}
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bool SelfTTYDevice::can_write(OpenFileDescription const&, u64) const
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{
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VERIFY_NOT_REACHED();
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}
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ErrorOr<size_t> SelfTTYDevice::read(OpenFileDescription&, u64, UserOrKernelBuffer&, size_t)
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{
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VERIFY_NOT_REACHED();
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}
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ErrorOr<size_t> SelfTTYDevice::write(OpenFileDescription&, u64, UserOrKernelBuffer const&, size_t)
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{
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VERIFY_NOT_REACHED();
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}
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UNMAP_AFTER_INIT SelfTTYDevice::SelfTTYDevice()
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: CharacterDevice(5, 0)
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{
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}
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UNMAP_AFTER_INIT SelfTTYDevice::~SelfTTYDevice()
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{
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}
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}
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