Andreas Kling 9dd29f9aa9 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.

2019-01-16 13:39:32 +01:00

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