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Kernel: Make UserOrKernelBuffer R/W helpers return KResultOr<size_t>

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This makes error propagation less cumbersome (and also exposed some
places where we were not doing it.)
This commit is contained in:
Andreas Kling 2021-05-13 09:08:44 +02:00
parent 25a45e639a
commit e46343bf9a
15 changed files with 64 additions and 85 deletions
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10
Kernel/Devices/HID/KeyboardDevice.cpp
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@ -298,13 +298,13 @@ KResultOr<size_t> KeyboardDevice::read(FileDescription&, u64, UserOrKernelBuffer
lock.unlock();
ssize_t n = buffer.write_buffered<sizeof(Event)>(sizeof(Event), [&](u8* data, size_t data_bytes) {
auto result = buffer.write_buffered<sizeof(Event)>(sizeof(Event), [&](u8* data, size_t data_bytes) {
memcpy(data, &event, sizeof(Event));
return (ssize_t)data_bytes;
return data_bytes;
});
if (n < 0)
return KResult((ErrnoCode)-n);
VERIFY((size_t)n == sizeof(Event));
if (result.is_error())
return result.error();
VERIFY(result.value() == sizeof(Event));
nread += sizeof(Event);
lock.lock();