1.\" $FreeBSD$ 2.Dd May 15, 1994 3.Dt COMCONTROL 8 4.Os FreeBSD 5.Sh NAME 6.Nm comcontrol 7.Nd control an special tty device. 8.Sh SYNOPSIS 9.Nm comcontrol 10.Ar special_device | Fl 11.Op dtrwait Ar number 12.Op drainwait Ar number 13.Sh DESCRIPTION 14.Nm Comcontrol 15is used to examine and modify some of the special characteristics 16of the specified tty device. 17If no arguments other than the device (or "-" for stdin) 18are specified, 19it prints the settings of all controllable characteristics. 20This usage requires only read access on the device. 21Only the superuser can change the settings. 22.Pp 23The following options are available: 24.Bl -tag -width indent 25.It Cm dtrwait Ar number 26Set the time to wait after dropping DTR 27to the given number. 28The units are hundredths of a second. 29The default is 300 hundredths, i.e., 3 seconds. 30This option needed mainly to set proper recover time after 31modem reset. 32.It Cm drainwait Ar number 33Set the time to wait for output drain 34to the given number. 35The units are seconds. 36The default is 5 minutes, 0 means 37waiting forever. 38This option needed mainly to specify upper limit of minutes 39to prevent modem hanging. 40.El 41.Pp 42The standard way to use 43.Nm 44is to put invocations of it in the 45.Pa /etc/rc.serial 46startup script. 47.Sh SEE ALSO 48.Xr stty 1 , 49.Xr sio 4 50.Sh FILES 51.Bl -tag -width /dev/ttyd? -compact 52.It Pa /dev/ttyd? 53dialin devices, hardwired terminals 54.It Pa /dev/cuaa? 55dialout devices 56.Sh AUTHORS 57.An Christopher G. Demetriou 58.Sh BUGS 59.Nm Comcontrol 60should be named 61.Nm siocontrol . 62.Sh HISTORY 63Originally part of cgd's com package patches, version 0.2.1, to 386BSD 0.1. 64Once controlled bidirectional capabilities. Little is left to control now 65that these capabilities are standard. 66