COMCONTROL(8) System Manager's Manual COMCONTROL(8) NAME comcontrol -- control a special tty device DEPRECATION NOTICE The comcontrol utility is deprecated and will be removed in FreeBSD 16.0. SYNOPSIS comcontrol special_device [drainwait number] DESCRIPTION The comcontrol utility is used to examine and modify some of the special characteristics of the specified tty device. If no arguments other than the device (or "-" for stdin) are specified, it prints the settings of all controllable characteristics. This usage requires only read access on the device. Only the superuser can change the settings. The following options are available: drainwait number Set the time to wait for output drain to the given number. The units are seconds. The default is 5 minutes, 0 means waiting for- ever. This option is needed mainly to specify an upper limit of minutes to prevent modem hanging. The standard way to use comcontrol is to put invocations of it in the /etc/rc.d/serial startup script. FILES /dev/ttyd? dialin devices, hardwired terminals /dev/cuau? dialout devices SEE ALSO stty(1) HISTORY Originally part of cgd's com package patches, version 0.2.1, to 386BSD 0.1. Once controlled bidirectional capabilities. Little is left to control now that these capabilities are standard. AUTHORS Christopher G. Demetriou FreeBSD 15.1 August 31, 2025 COMCONTROL(8)
NAME | DEPRECATION NOTICE | SYNOPSIS | DESCRIPTION | FILES | SEE ALSO | HISTORY | AUTHORS
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