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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
Notes: sideshowbarker 2024-07-18 02:16:48 +09:00
4 changed files with 58 additions and 11 deletions
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18
Kernel/ProcessExposed.h
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@ -69,7 +69,9 @@ public:
virtual KResultOr<size_t> read_bytes(off_t, size_t, UserOrKernelBuffer&, OpenFileDescription*) const { VERIFY_NOT_REACHED(); }
virtual KResult traverse_as_directory(unsigned, Function<bool(FileSystem::DirectoryEntryView const&)>) const { VERIFY_NOT_REACHED(); }
virtual KResultOr<NonnullRefPtr<ProcFSExposedComponent>> lookup(StringView) { VERIFY_NOT_REACHED(); };
virtual KResultOr<size_t> write_bytes(off_t, size_t, const UserOrKernelBuffer&, OpenFileDescription*) { return KResult(EROFS); }
virtual KResultOr<size_t> write_bytes(off_t, size_t, const UserOrKernelBuffer&, OpenFileDescription*) { return EROFS; }
virtual KResult truncate(u64) { return EPERM; }
virtual KResult set_mtime(time_t) { return ENOTIMPL; }
virtual mode_t required_mode() const { return 0444; }
virtual UserID owner_user() const { return 0; }
@ -182,10 +184,16 @@ protected:
: ProcFSGlobalInformation(name)
{
}
virtual KResult try_generate(KBufferBuilder& builder) override
{
return builder.appendff("{}\n", value());
}
private:
// ^ProcFSGlobalInformation
virtual KResult try_generate(KBufferBuilder&) override final;
// ^ProcFSExposedComponent
virtual KResultOr<size_t> write_bytes(off_t, size_t, const UserOrKernelBuffer&, OpenFileDescription*) override final;
virtual mode_t required_mode() const override final { return 0644; }
virtual KResult truncate(u64) override final;
virtual KResult set_mtime(time_t) override final;
};
}