Yu Watanabe
7647378b74
This partially reverts 12807b5a49.
Otherwise, reading or writing a fd in on_exit_event() handler may return
EBUSY, and the event loop may finish with -ELOOP.
Also, this makes drained() returns true if the PTY forwarder is already
disconnected, for safety. Hence, it is not necessary to re-introduce
pty_forward_is_done().
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