1.Dd May 15, 1994 2.Dt COMCONTROL 8 3.Os FreeBSD 4.Sh NAME 5.Nm comcontrol 6.Nd control an sio device. 7.Sh SYNOPSIS 8.Nm comcontrol 9.Ar sio_special_device 10.Op options 11.Sh DESCRIPTION 12.Nm Comcontrol 13is used to examine and modify some of the special characterstics 14of the specified sio device. 15If no arguments other than the device are specified, 16it prints the settings of all controllable characteristics. 17This usage requires only read access on the device. 18Only the superuser can change the settings. 19.Pp 20The following options are available: 21.Bl -tag -width Fl 22.It Cm dtrwait Ar number 23Set the time to wait after dropping DTR 24to the given number. 25The units are hundredths of a second. 26The default is 300 hundredths, i.e., 3 seconds. 27This option needed mainly to set proper recover time after 28modem reset. 29.El 30.Bl -tag -width Fl 31.It Cm drainwait Ar number 32Set the time to wait for output drain 33to the given number. 34The units are seconds. 35The default is 0, i.e. wait forever. 36This option needed mainly to specify upper limit of minutes 37to prevent modem hanging. 38.El 39.Pp 40The standard way to use 41.Nm comcontrol 42is to put invocations of it in the 43.Ar /etc/rc.serial 44startup script. 45.Sh SEE ALSO 46.Xr sio 4 , 47.Xr stty 1 . 48.Sh FILES 49.Bl -tag -width Pa 50.It Pa /dev/ttyd? 51dialin devices, hardwired terminals 52.It Pa /dev/cuaa? 53dialout devices. 54.Sh AUTHOR 55Christopher G. Demetriou 56.Sh BUGS 57.Nm comcontrol 58should be named 59.Nm siocontrol . 60. 61.Sh HISTORY 62Originally part of cgd's com package patches, version 0.2.1, to 386BSD 0.1. 63Once controlled bidirectional capabilities. Little is left to control now 64that these capabilities are standard. 65