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1b2ef8582c
Asking a File if we could possibly read or write it will never mutate the asking FileDescription&, so it should be const.
37 lines
558 B
C++
37 lines
558 B
C++
#include "NullDevice.h"
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#include <AK/StdLibExtras.h>
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#include <AK/kstdio.h>
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static NullDevice* s_the;
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NullDevice& NullDevice::the()
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{
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ASSERT(s_the);
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return *s_the;
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}
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NullDevice::NullDevice()
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: CharacterDevice(1, 3)
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{
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s_the = this;
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}
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NullDevice::~NullDevice()
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{
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}
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bool NullDevice::can_read(const FileDescription&) const
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{
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return true;
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}
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ssize_t NullDevice::read(FileDescription&, u8*, ssize_t)
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{
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return 0;
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}
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ssize_t NullDevice::write(FileDescription&, const u8*, ssize_t buffer_size)
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{
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return min(PAGE_SIZE, buffer_size);
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}
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