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Add a PTY multiplexer (/dev/ptmx) device.
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.
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13 changed files with 75 additions and 37 deletions
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@ -5,13 +5,13 @@
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class MasterPTY;
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class SlavePTY final : public TTY {
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AK_MAKE_ETERNAL
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public:
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virtual ~SlavePTY() override;
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virtual String tty_name() const override;
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void on_master_write(const byte*, size_t);
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unsigned index() const { return m_index; }
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protected:
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virtual void on_tty_write(const byte*, size_t) override;
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