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* hurdio.c (hurdio_writer_loop): Check output_stopped instead termflags.
Move the code that signals the underlying file to ...
(hurdio_start_output): ... here.
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* hurdio.c (hurdio_writer_loop): Desert the DTR on all errors, not
only EIO.
(hurdio_reader_loop): Likewise.
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* term.h (struct bottomhalf): New member `fini'.
* hurdio.c (hurdio_fini): New function.
(hurdio_bottom): Use it.
* devio.c (devio_fini): New function.
(devio_bottom): Use it.
* ptyio.c (ptyio_bottom): Add 0 entry for `fini'.
* main.c (trivfs_runtime_argp): New variable.
(options): Add --name/-N and --type/-T options.
(parse_opt): Collect parsed options in temporary storage and apply
them only at final success. For T_HURDIO, allow absent arg.
For non-startup parsing call, allow any missing args.
(tty_type_names): New const variable.
(trivfs_append_args): New function.
(main): Open underlying node with O_RDWR.
* hurdio.c (wait_for_dtr): If tty_arg is null, use termctl->underlying
instead of opening a node by name.
(hurdio_desert_dtr): If tty_arg is null, don't deallocate ioport.
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* term.h (struct bottomhalf): New member GWINSZ.
* devio.c (devio_bottom): Add new member.
* ptyio.c (ptyio_bottom): Likewise.
* hurdio.c (hurdio_bottom): Likewise.
(hurdio_gwinsz): New function.
(tioc_caps): Change type to unsigned int.
(TIOC_CAP_GWINSZ): New symbol.
* users.c (open_hook): Call GWINSZ of bottom layer after
establishing the carrier.
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* hurdio.c (hurdio_reader_loop): Add a return stmt.
(hurdio_writer_loop): Likewise.
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* hurdio.c: New file.
* Makefile (SRCS): Add hurdio.c.
* term.h: Add hurdio_bottom declaration.
* main.c: Add T_HURDIO to enum of tty_type.
(parse_opt): Add case for hurdio bottom handler.
(term_argp): Likewise.
(main): Likewise.
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