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+.Dd May 15, 1994
+.Dt COMCONTROL 8
+.Os FreeBSD
+.Sh NAME
+.Nm comcontrol
+.Nd control an sio device.
+.Sh SYNOPSIS
+.Nm comcontrol
+.Ar sio_special_device
+.Op options
+.Sh DESCRIPTION
+.Nm Comcontrol
+is used to examine and modify some of the special characteristics
+of the specified sio device.
+If no arguments other than the device are specified,
+it prints the settings of all controllable characteristics.
+This usage requires only read access on the device.
+Only the superuser can change the settings.
+.Pp
+The following options are available:
+.Bl -tag -width Fl
+.It Cm dtrwait Ar number
+Set the time to wait after dropping DTR
+to the given number.
+The units are hundredths of a second.
+The default is 300 hundredths, i.e., 3 seconds.
+This option needed mainly to set proper recover time after
+modem reset.
+.El
+.Bl -tag -width Fl
+.It Cm drainwait Ar number
+Set the time to wait for output drain
+to the given number.
+The units are seconds.
+The default is 0, i.e. wait forever.
+This option needed mainly to specify upper limit of minutes
+to prevent modem hanging.
+.El
+.Pp
+The standard way to use
+.Nm comcontrol
+is to put invocations of it in the
+.Ar /etc/rc.serial
+startup script.
+.Sh SEE ALSO
+.Xr sio 4 ,
+.Xr stty 1 .
+.Sh FILES
+.Bl -tag -width Pa
+.It Pa /dev/ttyd?
+dialin devices, hardwired terminals
+.It Pa /dev/cuaa?
+dialout devices.
+.Sh AUTHOR
+Christopher G. Demetriou
+.Sh BUGS
+.Nm comcontrol
+should be named
+.Nm siocontrol .
+.Sh HISTORY
+Originally part of cgd's com package patches, version 0.2.1, to 386BSD 0.1.
+Once controlled bidirectional capabilities.  Little is left to control now
+that these capabilities are standard.