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Date: Fri, 21 Jul 1995 10:47:10 -0700
From: Bruce Evans <bde>
Message-Id: <199507211747.KAA14087@freefall.cdrom.com>
To: CVS-commiters, cvs-sys
Subject: cvs commit: src/sys/sys tty.h
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bde         95/07/21 10:47:09

  Modified:    sys/sys   tty.h
  Log:
  Obtained from:	partly from an ancient patch of mine via 1.1.5
  
  Temporarily nuke TS_WOPEN.  It was only used for the obscure MDMBUF
  flow control option in the kernel and for informational purposes
  in `pstat -t'.  The latter worked properly only for ptys.  In
  general there may be multiple processes sleeping in open() and
  multiple processes that successfully opened the tty by opening it
  in O_NONBLOCK mode or during a window when CLOCAL was set.  tty.c
  doesn't have enough information to maintain the flag but always
  cleared it in ttyopen().
  
  TS_WOPEN should be restored someday just so that `pstat -t' can
  display it (MDMBUF is already fixed).  Fixing it requires counting
  of processes sleeping in open() in too many serial drivers.