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Kernel: Add FileDescription read/write API that bypasses current offset

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Forcing users of a FileDescription to seek before they can read/write
makes it inherently racy. This patch adds variants of read/write that
simply ignore the "current offset" of the description in favor of a
caller-supplied offset.
This commit is contained in:
Andreas Kling 2021-07-16 00:35:48 +02:00
parent ace8b9a0ee
commit d1395f2eb9
2 changed files with 18 additions and 0 deletions
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4
Kernel/FileSystem/FileDescription.h
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@ -51,6 +51,10 @@ public:
KResultOr<size_t> write(const UserOrKernelBuffer& data, size_t);
KResult stat(::stat&);
// NOTE: These ignore the current offset of this file description.
KResultOr<size_t> read(UserOrKernelBuffer&, u64 offset, size_t);
KResultOr<size_t> write(u64 offset, UserOrKernelBuffer const&, size_t);
KResult chmod(mode_t);
bool can_read() const;