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Kernel/ProcFS: Provide a way to write to ProcFS inodes

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ProcFSGlobalInode now calls `write_bytes()`, `truncate()` and
`set_mtime()` on its associated component. This allows us to write 0 or
1 to a ProcFSSystemBoolean component to toggle a boolean value.
This commit is contained in:
SeekingBlues 2021-10-16 17:35:59 -04:00 • committed by Andreas Kling
parent f8e89306e0
commit 3d174e3ad2
4 changed files with 58 additions and 11 deletions
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33
Kernel/ProcessExposed.cpp
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@ -153,6 +153,39 @@ KResult ProcFSGlobalInformation::refresh_data(OpenFileDescription& description)
return KSuccess;
}
KResult ProcFSSystemBoolean::try_generate(KBufferBuilder& builder)
{
return builder.appendff("{}\n", static_cast<int>(value()));
}
KResultOr<size_t> ProcFSSystemBoolean::write_bytes(off_t, size_t count, const UserOrKernelBuffer& buffer, OpenFileDescription*)
{
if (count != 1)
return EINVAL;
MutexLocker locker(m_refresh_lock);
char value = 0;
TRY(buffer.read(&value, 1));
if (value == '0')
set_value(false);
else if (value == '1')
set_value(true);
else
return EINVAL;
return 1;
}
KResult ProcFSSystemBoolean::truncate(u64 size)
{
if (size != 0)
return EPERM;
return KSuccess;
}
KResult ProcFSSystemBoolean::set_mtime(time_t)
{
return KSuccess;
}
KResultOr<size_t> ProcFSExposedLink::read_bytes(off_t offset, size_t count, UserOrKernelBuffer& buffer, OpenFileDescription*) const
{
VERIFY(offset == 0);