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64 lines
1.6 KiB
Groff
64 lines
1.6 KiB
Groff
.\" $FreeBSD$
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.Dd May 15, 1994
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.Dt COMCONTROL 8
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.Os
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.Sh NAME
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.Nm comcontrol
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.Nd control a special tty device
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.Sh SYNOPSIS
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.Nm
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.Ar special_device
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.Op dtrwait Ar number
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.Op drainwait Ar number
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.Sh DESCRIPTION
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.Nm Comcontrol
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is used to examine and modify some of the special characteristics
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of the specified tty device.
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If no arguments other than the device (or "-" for stdin)
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are specified,
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it prints the settings of all controllable characteristics.
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This usage requires only read access on the device.
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Only the superuser can change the settings.
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.Pp
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The following options are available:
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.Bl -tag -width indent
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.It Cm dtrwait Ar number
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Set the time to wait after dropping DTR
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to the given number.
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The units are hundredths of a second.
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The default is 300 hundredths, i.e., 3 seconds.
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This option needed mainly to set proper recover time after
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modem reset.
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.It Cm drainwait Ar number
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Set the time to wait for output drain
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to the given number.
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The units are seconds.
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The default is 5 minutes, 0 means
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waiting forever.
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This option needed mainly to specify upper limit of minutes
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to prevent modem hanging.
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.El
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.Pp
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The standard way to use
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.Nm
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is to put invocations of it in the
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.Pa /etc/rc.serial
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startup script.
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.Sh SEE ALSO
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.Xr stty 1 ,
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.Xr sio 4
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.Sh FILES
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.Bl -tag -width /dev/ttyd? -compact
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.It Pa /dev/ttyd?
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dialin devices, hardwired terminals
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.It Pa /dev/cuaa?
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dialout devices
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.El
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.Sh AUTHORS
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.An Christopher G. Demetriou
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.Sh HISTORY
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Originally part of cgd's com package patches, version 0.2.1, to
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.Bx 386 0.1 .
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Once controlled bidirectional capabilities. Little is left to control now
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that these capabilities are standard.
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