is a pty.
(do_eof): Removed the pty ^D hack,a s it's now taken care of by
close_fd_write.

* src/io.c (io_set_type): New function.
(close_fd_nicely): Call close_fd_write, for handling the
write-related work.
(close_fd_write): If the fd is a pty, write a EOF (^D) character.

* src/io.h (lsh_fd): New attribute TYPE.

Rev: ChangeLog:1.512
Rev: src/io.c:1.167
Rev: src/io.h:1.90
Rev: src/server_session.c:1.85