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Date: Sat, 6 May 1995 23:32:30 -0700
From: Bruce Evans <bde>
Message-Id: <199505070632.XAA07345@freefall.cdrom.com>
To: CVS-commiters, cvs-sys
Subject: cvs commit: src/sys/kern tty.c
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bde         95/05/06 23:32:29

  Modified:    sys/kern  tty.c
  Log:
  Test the correct nonblocking flag in ttylclose().  IO_NDELAY is only valid
  in read() and write().  FNONBLOCK is valid in ioctl() and close().
  
  The bug caused hung ptys when a process talked to itself using nonblocking
  i/o and exited while the slave pty had output to flush.  ttywait() was
  called and hung.  Signals didn't work because the process was exiting.
  `comcontrol /dev/ttyp0 drainwait 1' worked to terminate the wait.  This
  shows that comcontrol is not limited to hardware control.  It has no i386
  or driver dependencies and doesn't belong in src/sbin/i386.
  
  Bruce