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Kernel: Make File::write() and File::read() return KResultOr<size_t>

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Instead of returning a ssize_t where negative values mean error,
we now return KResultOr<size_t> and use the error state to report
errors exclusively.
This commit is contained in:
Andreas Kling 2020-08-04 18:02:23 +02:00
parent 58feebeed2
commit 7a3ab6c517
58 changed files with 223 additions and 229 deletions
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10
Kernel/Devices/FullDevice.cpp
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@ -46,18 +46,18 @@ bool FullDevice::can_read(const FileDescription&, size_t) const
return true;
}
ssize_t FullDevice::read(FileDescription&, size_t, u8* buffer, ssize_t size)
KResultOr<size_t> FullDevice::read(FileDescription&, size_t, u8* buffer, size_t size)
{
ssize_t count = min(static_cast<ssize_t>(PAGE_SIZE), size);
memset(buffer, 0, (size_t)count);
ssize_t count = min(static_cast<size_t>(PAGE_SIZE), size);
memset(buffer, 0, count);
return count;
}
ssize_t FullDevice::write(FileDescription&, size_t, const u8*, ssize_t size)
KResultOr<size_t> FullDevice::write(FileDescription&, size_t, const u8*, size_t size)
{
if (size == 0)
return 0;
return -ENOSPC;
return KResult(-ENOSPC);
}
}