1.Dd May 15, 1994 2.Dt COMCONTROL 8 3.Os 4.Sh NAME 5.Nm comcontrol 6.Nd control a special tty device 7.Sh SYNOPSIS 8.Nm 9.Ar special_device 10.Op dtrwait Ar number 11.Op drainwait Ar number 12.Sh DESCRIPTION 13The 14.Nm 15utility is 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 is needed mainly to specify an 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.d/serial 46startup script. 47.Sh FILES 48.Bl -tag -width /dev/ttyd? -compact 49.It Pa /dev/ttyd? 50dialin devices, hardwired terminals 51.It Pa /dev/cuau? 52dialout devices 53.El 54.Sh SEE ALSO 55.Xr stty 1 , 56.Sh HISTORY 57Originally part of cgd's com package patches, version 0.2.1, to 58.Bx 386 0.1 . 59Once controlled bidirectional capabilities. 60Little is left to control now 61that these capabilities are standard. 62.Sh AUTHORS 63.An Christopher G. Demetriou 64