1.\" $FreeBSD: src/sbin/comcontrol/comcontrol.8,v 1.15.2.7 2002/08/21 18:58:13 trhodes Exp $ 2.\" $DragonFly: src/sbin/comcontrol/comcontrol.8,v 1.2 2003/06/17 04:27:32 dillon Exp $ 3.Dd May 15, 1994 4.Dt COMCONTROL 8 5.Os 6.Sh NAME 7.Nm comcontrol 8.Nd control a special tty device 9.Sh SYNOPSIS 10.Nm 11.Ar special_device 12.Op dtrwait Ar number 13.Op drainwait Ar number 14.Sh DESCRIPTION 15The 16.Nm 17utility is used to examine and modify some of the special characteristics 18of the specified tty device. 19If no arguments other than the device (or "-" for stdin) 20are specified, 21it prints the settings of all controllable characteristics. 22This usage requires only read access on the device. 23Only the superuser can change the settings. 24.Pp 25The following options are available: 26.Bl -tag -width indent 27.It Cm dtrwait Ar number 28Set the time to wait after dropping DTR 29to the given number. 30The units are hundredths of a second. 31The default is 300 hundredths, i.e., 3 seconds. 32This option needed mainly to set proper recover time after 33modem reset. 34.It Cm drainwait Ar number 35Set the time to wait for output drain 36to the given number. 37The units are seconds. 38The default is 0 minutes, 0 means 39waiting forever. 40This option needed mainly to specify upper limit of minutes 41to prevent modem hanging. 42.El 43.Pp 44The standard way to use 45.Nm 46is to put invocations of it in the 47.Pa /etc/rc.serial 48startup script. 49.Sh SEE ALSO 50.Xr stty 1 , 51.Xr sio 4 52.Sh FILES 53.Bl -tag -width /dev/ttyd? -compact 54.It Pa /dev/ttyd? 55dialin devices, hardwired terminals 56.It Pa /dev/cuaa? 57dialout devices 58.El 59.Sh AUTHORS 60.An Christopher G. Demetriou 61.Sh HISTORY 62Originally part of cgd's com package patches, version 0.2.1, to 63.Bx 386 0.1 . 64Once controlled bidirectional capabilities. Little is left to control now 65that these capabilities are standard. 66