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