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Warner Losh
4b4cf0d52c
Nothing uses dtrwait anymore. This was elimianted with the tty mpsafe rewrite for FreeBSD 8. Only these zombie symbols and functionality remain. GC them. Add comcontrol to the list things to remove in 16.0. Sponsored by: Netflix Reviewed by: kevans, emaste Differential Revision: https://reviews.freebsd.org/D52317
60 lines
1.4 KiB
Plaintext
60 lines
1.4 KiB
Plaintext
.Dd August 31, 2025
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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 DEPRECATION NOTICE
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The
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.Nm
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utility is deprecated and will be removed in
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.Fx 16.0 .
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.Sh SYNOPSIS
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.Nm
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.Ar special_device
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.Op drainwait Ar number
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.Sh DESCRIPTION
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The
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.Nm
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utility 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 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 is needed mainly to specify an 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.d/serial
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startup script.
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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/cuau?
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dialout devices
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.El
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.Sh SEE ALSO
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.Xr stty 1
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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.
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Little is left to control now that these capabilities are standard.
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.Sh AUTHORS
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.An Christopher G. Demetriou
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