comcontrol
—
control a special tty device
comcontrol |
special_device [ dtrwait
number ] [drainwait
number ] |
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:
dtrwait
number
- Set the time to wait after dropping DTR to the given number. The units are
hundredths of a second. The default is 300 hundredths, i.e., 3 seconds.
This option needed mainly to set proper recover time after modem
reset.
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 forever. This option
needed mainly to specify 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.
- /dev/ttyd?
- dialin devices, hardwired terminals
- /dev/cuau?
- dialout devices
stty(1),
sio(4)
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.
Christopher G. Demetriou