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Kernel: Make UserOrKernelBuffer R/W helpers return KResultOr<size_t>
This makes error propagation less cumbersome (and also exposed some places where we were not doing it.)
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15 changed files with 64 additions and 85 deletions
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@ -298,13 +298,13 @@ KResultOr<size_t> KeyboardDevice::read(FileDescription&, u64, UserOrKernelBuffer
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lock.unlock();
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ssize_t n = buffer.write_buffered<sizeof(Event)>(sizeof(Event), [&](u8* data, size_t data_bytes) {
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auto result = buffer.write_buffered<sizeof(Event)>(sizeof(Event), [&](u8* data, size_t data_bytes) {
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memcpy(data, &event, sizeof(Event));
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return (ssize_t)data_bytes;
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return data_bytes;
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});
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if (n < 0)
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return KResult((ErrnoCode)-n);
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VERIFY((size_t)n == sizeof(Event));
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if (result.is_error())
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return result.error();
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VERIFY(result.value() == sizeof(Event));
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nread += sizeof(Event);
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lock.lock();
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