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https://github.com/RGBCube/serenity
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b0e3f73375
Userspace programs can now open /dev/gui_events and read a stream of GUI_Event structs one at a time. I was stuck on a stupid problem where we'd reenter Scheduler::yield() due to having one of the has_data_available_for_reading() implementations using locks.
31 lines
542 B
C++
31 lines
542 B
C++
#include "ZeroDevice.h"
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#include "Limits.h"
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#include <AK/StdLibExtras.h>
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#include <AK/kstdio.h>
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ZeroDevice::ZeroDevice()
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: CharacterDevice(1, 5)
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{
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}
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ZeroDevice::~ZeroDevice()
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{
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}
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bool ZeroDevice::has_data_available_for_reading(Process&) const
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{
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return true;
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}
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ssize_t ZeroDevice::read(byte* buffer, size_t bufferSize)
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{
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size_t count = min(GoodBufferSize, bufferSize);
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memset(buffer, 0, count);
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return count;
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}
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ssize_t ZeroDevice::write(const byte*, size_t bufferSize)
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{
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return min(GoodBufferSize, bufferSize);
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}
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