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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.
24 lines
717 B
C++
24 lines
717 B
C++
#pragma once
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#include <VirtualFileSystem/CharacterDevice.h>
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#include <AK/Lock.h>
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class MasterPTY;
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class PTYMultiplexer final : public CharacterDevice {
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AK_MAKE_ETERNAL
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public:
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PTYMultiplexer();
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virtual ~PTYMultiplexer() override;
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// ^CharacterDevice
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virtual RetainPtr<FileDescriptor> open(int& error, int options) override;
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virtual ssize_t read(Process&, byte*, size_t) override { return 0; }
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virtual ssize_t write(Process&, const byte*, size_t) override { return 0; }
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virtual bool can_read(Process&) const override { return true; }
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virtual bool can_write(Process&) const override { return true; }
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private:
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SpinLock m_lock;
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Vector<RetainPtr<MasterPTY>> m_freelist;
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};
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