mirror of
https://github.com/SerenityOS/serenity
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16244c490a
We used to allocate major numbers quite randomly, with no common place to look them up if needed. This commit is changing that by placing all major number allocations under a new C++ namespace, in the API/MajorNumberAllocation.h file. We also add the foundations of what is needed before we can publish this information (allocated numbers for block and char devices) to userspace.
69 lines
1.9 KiB
C++
69 lines
1.9 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/API/MajorNumberAllocation.h>
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#include <Kernel/Devices/DeviceManagement.h>
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#include <Kernel/Devices/Generic/SelfTTYDevice.h>
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#include <Kernel/Devices/TTY/TTY.h>
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#include <Kernel/Sections.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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auto 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(MajorAllocation::CharacterDeviceFamily::Console, 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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