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race in tty handling code

Hi!

  if  application performs write to tty with ONLCR flag turned off and
  then    immediately    calls    tcsetattr    to    turn    it    on,
fhandler_pty_master::process_slave_output     gets    confused.   it
calculates rlen according to old tty settings and signals output_done
event.  then  it process the buffer according to new tty settings, and
stumbles  over  internal  error  message. Patch attached  (well,  this
time  i  triple-checked  that  it does contain changelog entry :)

Egor.            mailto:deo@logos-m.ru ICQ 5165414 FidoNet 2:5020/496.19

tty-write-tcsetattr-race.ChangeLog

tty-write-tcsetattr-race.diff

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