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Add a PTY multiplexer (/dev/ptmx) device.

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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.
This commit is contained in:
Andreas Kling 2019-01-16 13:36:10 +01:00
parent b46ae2bf09
commit 9dd29f9aa9
13 changed files with 75 additions and 37 deletions
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2
Kernel/MasterPTY.h
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@ -6,7 +6,6 @@
class SlavePTY;
class MasterPTY final : public CharacterDevice {
AK_MAKE_ETERNAL
public:
explicit MasterPTY(unsigned index);
virtual ~MasterPTY() override;
@ -17,6 +16,7 @@ public:
virtual bool can_write(Process&) const override;
virtual bool is_master_pty() const override { return true; }
unsigned index() const { return m_index; }
String pts_name() const;
void on_slave_write(const byte*, size_t);