ladybird/VirtualFileSystem/NullDevice.h

#pragma once

#include "CharacterDevice.h"

class NullDevice final : public CharacterDevice {
    AK_MAKE_ETERNAL
public:
    NullDevice();
    virtual ~NullDevice() override;

    virtual ssize_t read(byte* buffer, size_t bufferSize) override;
    virtual ssize_t write(const byte* buffer, size_t bufferSize) override;
    virtual bool has_data_available_for_reading(Process&) const override;
};
Add basic character device support. Start with null and zero. 2018-10-14 02:59:22 +02:00			`#pragma once`

			`#include "CharacterDevice.h"`

			`class NullDevice final : public CharacterDevice {`
Add a kmalloc_eternal() for things that will never be destroyed. 2018-10-31 23:19:15 +01:00			`AK_MAKE_ETERNAL`
Add basic character device support. Start with null and zero. 2018-10-14 02:59:22 +02:00			`public:`
			`NullDevice();`
Implement a basic way for read() to block. FileHandle gets a hasDataAvailableForRead() getter. If this returns true in sys$read(), the task will block(BlockedRead) + yield. The fd blocked on is stored in Task::m_fdBlockedOnRead. The scheduler then looks at the state of that fd during the unblock phase. This makes "sh" restful. :^) There's still some problem with the kernel not surviving the colonel task getting scheduled. I need to figure that out and fix it. 2018-10-25 13:07:59 +02:00			`virtual ~NullDevice() override;`
Add basic character device support. Start with null and zero. 2018-10-14 02:59:22 +02:00
Make it possible to build the Kernel on a macOS host. It still requires an ELF compiler and linker, but at least it builds. I need to get rid of the "Unix" namespace. This does a lot of that. 2018-12-02 23:34:50 +01:00			`virtual ssize_t read(byte* buffer, size_t bufferSize) override;`
			`virtual ssize_t write(const byte* buffer, size_t bufferSize) override;`
Start refactoring the windowing system to use an event loop. 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. 2019-01-14 14:21:51 +01:00			`virtual bool has_data_available_for_reading(Process&) const override;`
Add basic character device support. Start with null and zero. 2018-10-14 02:59:22 +02:00			`};`