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751aae77bc
The name "variables" is a bit awkward and what the directory entries are really about is kernel configuration so let's make it clear with the new name.
49 lines
1.3 KiB
C++
49 lines
1.3 KiB
C++
/*
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* Copyright (c) 2022-2023, 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/FileSystem/SysFS/Subsystems/Kernel/Configuration/BooleanVariable.h>
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#include <Kernel/Sections.h>
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#include <Kernel/Tasks/Process.h>
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namespace Kernel {
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ErrorOr<void> SysFSSystemBooleanVariable::try_generate(KBufferBuilder& builder)
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{
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return builder.appendff("{}\n", static_cast<int>(value()));
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}
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ErrorOr<size_t> SysFSSystemBooleanVariable::write_bytes(off_t, size_t count, UserOrKernelBuffer const& buffer, OpenFileDescription*)
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{
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MutexLocker locker(m_refresh_lock);
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// Note: We do all of this code before taking the spinlock because then we disable
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// interrupts so page faults will not work.
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char value = 0;
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TRY(buffer.read(&value, 1));
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// NOTE: If we are in a jail, don't let the current process to change the variable.
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if (Process::current().is_currently_in_jail())
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return Error::from_errno(EPERM);
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if (count != 1)
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return Error::from_errno(EINVAL);
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if (value == '0') {
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set_value(false);
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return 1;
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} else if (value == '1') {
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set_value(true);
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return 1;
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}
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return Error::from_errno(EINVAL);
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}
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ErrorOr<void> SysFSSystemBooleanVariable::truncate(u64 size)
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{
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if (size != 0)
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return EPERM;
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return {};
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}
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}
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