Andreas Kling b4e478aa50 Deallocate PTY's when they close. ...

This required a fair bit of plumbing. The CharacterDevice::close() virtual
will now be closed by ~FileDescriptor(), allowing device implementations to
do custom cleanup at that point.

One big problem remains: if the master PTY is closed before the slave PTY,
we go into crashy land.

2019-01-30 18:47:18 +01:00

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