[Bug 205797] Feature: Keyboard map item for backspace key that obeys DECBKM

bugzilla-noreply at freebsd.org bugzilla-noreply at freebsd.org
Sat Jan 2 11:07:26 UTC 2016


            Bug ID: 205797
           Summary: Feature: Keyboard map item for backspace key that
                    obeys DECBKM
           Product: Base System
           Version: 11.0-CURRENT
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: misc
          Assignee: freebsd-bugs at FreeBSD.org
          Reporter: J.deBoynePollard-newsgroups at NTLWorld.COM

In an actual DEC VT52x terminal the operation of the <[X] (a.k.a. [Backspace])
key is controlled by a DEC private mode setting, DECBKM.  This setting allows
applications to control whether the key sends the DEL or the BS character. 
(It's also reachable via the menu on the terminal's local user interface.)

Neither the vt nor the syscons subsystems implement that.  So all vt and
syscons keyboard maps explicitly state either "bs" or "del" for that key.

The nosh toolset's virtual terminal subsystem does implement DECBKM, however. 
So it requires an extension to the kbdmap(5) format.  It employs this extension
in an overlay keyboard map supplied in the toolset, soft_backspace.kbd, that is
applied on top of the system-supplied ones during keyboard map import.

That extension is "bspace", defined as causing the emission of BS or DEL
according to the current value of the DECBKM setting.

Please don't use this name in the vt or syscons systems, unless you're
extending them likewise.  Thank you.

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