tty-slave read() patch

[Egor Duda]

Hi!

  i've  changed  the  way  fhandler_tty_slave::read  communicates with
master.   it  addresses  a  couple  of  problems.  currently,  when in
non-canonical  mode  and  vmin=1,  read() never reads more then 1 byte
from  the  pipe,   even   if  more  input  is available. the result is
following:  when user  presses  F1 key in ssh window, this keypress is
actually  sent  to server  not  in  one  packet but in 4. This is very
noticeable on slow links. it also eliminates pipe polling.

Egor.            mailto:deo@logos-m.ru ICQ 5165414 FidoNet 2:5020/496.19
tty-slave-read.diff
tty-slave-read.ChangeLog

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2001-02-28  Egor Duda  <deo@logos-m.ru>

	* fhandler.h (class fhandler_tty_common): New mutex and event to
	syncronize input on master tty with slave tty.
	* fhandler_tty.cc (fhandler_pty_master::accept_input): Use them to
	syncronize with slave.
	* fhandler_tty.cc (fhandler_tty_slave::read): Use input mutex and
	event to syncronize with master. Do not limit amount of data read
	from master to vmin value. Interrupt on signal and return already
	read data, if any.
	* fhandler_tty.cc (fhandler_tty_slave::open): Handle input mutex and
	event.
	* fhandler_tty.cc (fhandler_tty_common::close): Ditto.
	* fhandler_tty.cc (fhandler_tty_common::set_close_on_exec): Ditto.
	* fhandler_tty.cc (fhandler_tty_common::fixup_after_fork): Ditto.
	* fhandler_tty.cc (fhandler_tty_common::dup): Ditto.
	* tty.h (tty::open_input_mutex): New function.
	* tty.cc (tty::common_init): Create input mutex and event.
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