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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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15
Kernel/Devices/SerialDevice.cpp
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@ -33,15 +33,11 @@ KResultOr<size_t> SerialDevice::read(FileDescription&, u64, UserOrKernelBuffer&
if (!(get_line_status() & DataReady))
return 0;
ssize_t nwritten = buffer.write_buffered<128>(size, [&](u8* data, size_t data_size) {
return buffer.write_buffered<128>(size, [&](u8* data, size_t data_size) {
for (size_t i = 0; i < data_size; i++)
data[i] = IO::in8(m_base_addr);
return (ssize_t)data_size;
return data_size;
});
if (nwritten < 0)
return KResult((ErrnoCode)-nwritten);
return size;
}
bool SerialDevice::can_write(const FileDescription&, size_t) const
@ -57,14 +53,11 @@ KResultOr<size_t> SerialDevice::write(FileDescription&, u64, const UserOrKernelB
if (!(get_line_status() & EmptyTransmitterHoldingRegister))
return 0;
ssize_t nread = buffer.read_buffered<128>(size, [&](const u8* data, size_t data_size) {
return buffer.read_buffered<128>(size, [&](u8 const* data, size_t data_size) {
for (size_t i = 0; i < data_size; i++)
IO::out8(m_base_addr, data[i]);
return (ssize_t)data_size;
return data_size;
});
if (nread < 0)
return KResult((ErrnoCode)-nread);
return (size_t)nread;
}
String SerialDevice::device_name() const