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+.Dd December 10, 1993
+.Dt COMCONTROL 8
+.Nd "control the bidirectional status of a sio port and waiting time after DTR drop"
+.Op Cm bidir | Fl bidir
+.Op Cm dtrwait Ar ticks
+is used to examine and modify the bidirectional status
+of a specified
+sio communications port
+and its waiting time after DTR drop.
+By default (if
+will print the current port state
+(if kernel was built with
+.Cm options COM_BIDIR )
+to indicate that bidirectional operation is enabled or
+to indicate that it is disabled, string
+and current waiting time in ticks
+after DTR drop.
+To modify the status of the port or waiting time, simply
+specify the desired new state
+and/or new waiting time
+on the command line. All users with
+read access to the
+to get the port's status and current waiting time.
+Only root can set a port's status and waiting time.
+By default, each port is initially unidirectional, waiting time is 50 ticks.
+The standard way to use
+is to put invocations of it in the
+.Sh SEE ALSO
+.Xr sio 4
+.Bl -tag -width Pa
+.It Pa /dev/sio??
+.Cm TIOCMSBIDIR: Inappropriate ioctl for device.
+This indicates attempt to change port status on
+a non-sio special device file,
+or the kernel has not been built with
+.Cm options COM_BIDIR .
+For more information concerning reconfiguration
+of your kernel see
+Christopher G. Demetriou
+It is strongly recommended that you do *not*
+change the bidirectional status of a port while there are programs
+using the port. Read that as: if you do, and it breaks, don't yell
+at me; that's a really weird thing to do.
+Originally part of cgd's com package patches, version 0.2.1, to 386BSD 0.1.