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Kernel: Create SelfTTYDevice class to help replace /dev/tty symlink

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This will replace the /dev/tty symlink created by SystemServer, so
instead of a symlink, a character device will be created. When doing
read(2), write(2) and ioctl(2) on this device, it will "redirect" these
operations to the attached TTY of the current process.
This commit is contained in:
Liav A 2022-02-15 21:24:31 +02:00 • committed by Andreas Kling
parent 2fb9eb5257
commit 12867d60ad
4 changed files with 102 additions and 0 deletions
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67
Kernel/Devices/SelfTTYDevice.cpp Normal file
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/*
* Copyright (c) 2022, Liav A. <liavalb@hotmail.co.il>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#include <Kernel/Devices/DeviceManagement.h>
#include <Kernel/Devices/SelfTTYDevice.h>
#include <Kernel/Sections.h>
#include <Kernel/TTY/TTY.h>
namespace Kernel {
UNMAP_AFTER_INIT NonnullRefPtr<SelfTTYDevice> SelfTTYDevice::must_create()
{
auto self_tty_device_or_error = DeviceManagement::try_create_device<SelfTTYDevice>();
// FIXME: Find a way to propagate errors
VERIFY(!self_tty_device_or_error.is_error());
return self_tty_device_or_error.release_value();
}
ErrorOr<NonnullRefPtr<OpenFileDescription>> SelfTTYDevice::open(int options)
{
// Note: If for some odd reason we try to open this device (early on boot?)
// while there's no current Process assigned, don't fail and return an error.
if (!Process::has_current())
return Error::from_errno(ESRCH);
auto& current_process = Process::current();
RefPtr<TTY> tty = current_process.tty();
if (!tty)
return Error::from_errno(ENXIO);
auto description = TRY(OpenFileDescription::try_create(*tty));
description->set_rw_mode(options);
description->set_file_flags(options);
return description;
}
bool SelfTTYDevice::can_read(OpenFileDescription const&, u64) const
{
VERIFY_NOT_REACHED();
}
bool SelfTTYDevice::can_write(OpenFileDescription const&, u64) const
{
VERIFY_NOT_REACHED();
}
ErrorOr<size_t> SelfTTYDevice::read(OpenFileDescription&, u64, UserOrKernelBuffer&, size_t)
{
VERIFY_NOT_REACHED();
}
ErrorOr<size_t> SelfTTYDevice::write(OpenFileDescription&, u64, UserOrKernelBuffer const&, size_t)
{
VERIFY_NOT_REACHED();
}
UNMAP_AFTER_INIT SelfTTYDevice::SelfTTYDevice()
: CharacterDevice(5, 0)
{
}
UNMAP_AFTER_INIT SelfTTYDevice::~SelfTTYDevice()
{
}
}