K 10
svn:author
V 3
bde
K 8
svn:date
V 27
1995-05-07T06:32:28.000000Z
K 7
svn:log
V 573
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

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