1.\" $FreeBSD$ 2.Dd May 15, 1994 3.Dt COMCONTROL 8 4.Os FreeBSD 5.Sh NAME 6.Nm comcontrol 7.Nd control an sio device. 8.Sh SYNOPSIS 9.Nm comcontrol 10.Ar sio_special_device 11.Op options 12.Sh DESCRIPTION 13.Nm Comcontrol 14is used to examine and modify some of the special characteristics 15of the specified sio device. 16If no arguments other than the device are specified, 17it prints the settings of all controllable characteristics. 18This usage requires only read access on the device. 19Only the superuser can change the settings. 20.Pp 21The following options are available: 22.Bl -tag -width indent 23.It Cm dtrwait Ar number 24Set the time to wait after dropping DTR 25to the given number. 26The units are hundredths of a second. 27The default is 300 hundredths, i.e., 3 seconds. 28This option needed mainly to set proper recover time after 29modem reset. 30.It Cm drainwait Ar number 31Set the time to wait for output drain 32to the given number. 33The units are seconds. 34The default is 0, i.e. wait forever. 35This option needed mainly to specify upper limit of minutes 36to prevent modem hanging. 37.El 38.Pp 39The standard way to use 40.Nm 41is to put invocations of it in the 42.Pa /etc/rc.serial 43startup script. 44.Sh SEE ALSO 45.Xr stty 1 , 46.Xr sio 4 47.Sh FILES 48.Bl -tag -width /dev/ttyd? -compact 49.It Pa /dev/ttyd? 50dialin devices, hardwired terminals 51.It Pa /dev/cuaa? 52dialout devices 53.Sh AUTHORS 54.An Christopher G. Demetriou 55.Sh BUGS 56.Nm Comcontrol 57should be named 58.Nm siocontrol . 59.Sh HISTORY 60Originally part of cgd's com package patches, version 0.2.1, to 386BSD 0.1. 61Once controlled bidirectional capabilities. Little is left to control now 62that these capabilities are standard. 63