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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.
38 lines
934 B
C++
38 lines
934 B
C++
#include "GUIEventDevice.h"
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#include <Kernel/Process.h>
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#include <AK/Lock.h>
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#include <LibC/errno_numbers.h>
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//#define GUIEVENTDEVICE_DEBUG
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GUIEventDevice::GUIEventDevice()
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: CharacterDevice(66, 1)
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{
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}
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GUIEventDevice::~GUIEventDevice()
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{
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}
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bool GUIEventDevice::has_data_available_for_reading(Process& process) const
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{
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return !process.gui_events().is_empty();
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}
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ssize_t GUIEventDevice::read(byte* buffer, size_t size)
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{
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#ifdef GUIEVENTDEVICE_DEBUG
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dbgprintf("GUIEventDevice::read(): %s<%u>, size=%u, sizeof(GUI_Event)=%u\n", current->name().characters(), current->pid(), size, sizeof(GUI_Event));
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#endif
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if (current->gui_events().is_empty())
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return 0;
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LOCKER(current->gui_events_lock());
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ASSERT(size == sizeof(GUI_Event));
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*reinterpret_cast<GUI_Event*>(buffer) = current->gui_events().take_first();
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return size;
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}
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ssize_t GUIEventDevice::write(const byte*, size_t)
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{
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return -EINVAL;
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}
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