Mdoc fixes and clarification.
Submitted by: sheldonh
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svn2git
2020-12-20 02:59:44 +00:00
svn path=/head/; revision=85464
@ -33,31 +33,39 @@
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.Nd control physical console devices
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.Nd control physical console devices
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.Sh SYNOPSIS
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.Sh SYNOPSIS
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.Nm
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.Nm
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.Op list
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.Op Cm list
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.Nm
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.Nm
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.Ic mute
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.Cm mute on | off
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.Ar on|off
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.Nm
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.Nm
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.Ic add|delete
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.Cm add | delete
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.Ar console
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.Ar console
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.Sh DESCRIPTION
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.Sh DESCRIPTION
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.Nm Conscontrol
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The
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is used to examine and modify the physical devices which back
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.Nm
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utility is used to examine and modify the physical devices which back
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the virtual console console devices.
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the virtual console console devices.
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If no arguments are specified
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If no arguments
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(or only the
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(or only the
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.Ar list
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.Cm list
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argument),
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command)
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are specified,
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the current console settings are shown.
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the current console settings are shown.
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.Pp
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.Pp
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There are two types of logical consoles; a high level console which
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There are two types of logical consoles; a high level console which
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is represented by /dev/console, and a low level console.
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is represented by
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The low level console is used for kernel printfs and debugger support,
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.Pa /dev/console , and a low level console.
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while the high level console is used by user programs like syslog.
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The low level console is used for kernel
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Multiple device support is implemented only for the low level console,
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.Xr printf 9
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and
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.Xr ddb 4
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debugger support,
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while the high level console is used by user programs like
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.Xr syslogd 8 .
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Multiple device support is implemented only for the low level console;
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the high level console is set to the first device in the console list.
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the high level console is set to the first device in the console list.
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.Pp
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.Pp
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Multiple console support may be invoked by passing the kernel the
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Multiple console support may be invoked by passing the kernel the
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.\" XXX The Fl macro doesn't really apply here
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-D
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-D
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flag from the boot loader, or by using
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flag from the boot loader, or by using
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.Nm
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.Nm
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@ -65,23 +73,24 @@ to change the list of console devices after the system has booted.
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.Pp
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.Pp
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The following options are available:
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The following options are available:
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.Bl -tag -width indent
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.Bl -tag -width indent
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.It Cm add|delete Ar console
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.It Cm add | delete Ar console
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Add or delete a physical device from the logical console.
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Add or delete a physical device from the logical console.
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The device must support low-level console operations.
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The device must support low-level console operations.
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Adding a device will place it at the front of the list of console
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Adding a device will place it at the front of the list of console
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devices; the first device is used for the high level console.
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devices; the first device is used for the high level console.
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.It Cm mute Ar on|off
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.It Cm mute Cm on | off
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Change the state of the console muting.
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Change the state of console muting.
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All console output is suppressed when console muting is on.
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.El
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.El
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.Sh SEE ALSO
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.Sh SEE ALSO
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.Xr boot 8 ,
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.Xr loader 8 ,
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.Xr sio 4 ,
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.Xr sio 4 ,
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.Xr syscons 4
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.Xr syscons 4 ,
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.Xr boot 8 ,
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.Xr loader 8
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.Sh HISTORY
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.Sh HISTORY
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The
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The
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.Nm
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.Nm
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command first appeared in
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command first appeared in
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.Fx 4.5 .
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.Fx 5.0 .
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.Sh AUTHORS
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.Sh AUTHORS
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.An Jonathan Lemon
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.An Jonathan Lemon
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