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When you open /dev/ptmx, you get a file descriptor pointing to one of the available MasterPTY's. If none are available, you get an EBUSY. This makes it possible to open multiple (up to 4) Terminals. :^) To support this, I also added a CharacterDevice::open() that gets control when VFS is opening a CharacterDevice. This is useful when we want to return a custom FileDescriptor like we do here.
38 lines
1 KiB
C++
38 lines
1 KiB
C++
#pragma once
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#include <AK/Retainable.h>
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#include <AK/Types.h>
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#include "Limits.h"
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#include "FileDescriptor.h"
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class Process;
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class CharacterDevice : public Retainable<CharacterDevice> {
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public:
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virtual ~CharacterDevice();
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InodeMetadata metadata() const { return { }; }
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virtual RetainPtr<FileDescriptor> open(int& error, int options);
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virtual bool can_read(Process&) const = 0;
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virtual bool can_write(Process&) const = 0;
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virtual ssize_t read(Process&, byte* buffer, size_t bufferSize) = 0;
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virtual ssize_t write(Process&, const byte* buffer, size_t bufferSize) = 0;
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unsigned major() const { return m_major; }
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unsigned minor() const { return m_minor; }
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virtual bool is_tty() const { return false; }
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virtual bool is_master_pty() const { return false; }
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virtual int ioctl(Process&, unsigned request, unsigned arg);
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protected:
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CharacterDevice(unsigned major, unsigned minor) : m_major(major), m_minor(minor) { }
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private:
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unsigned m_major { 0 };
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unsigned m_minor { 0 };
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};
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