[Bug 8981] New: ash: add "caller" as an ash builtin

[bugzilla at busybox.net]

https://bugs.busybox.net/show_bug.cgi?id=8981

            Bug ID: 8981
           Summary: ash: add "caller" as an ash builtin
           Product: Busybox
           Version: 1.24.x
          Hardware: All
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P5
         Component: Other
          Assignee: unassigned at busybox.net
          Reporter: jhanley at dgtlrift.com
                CC: busybox-cvs at busybox.net
  Target Milestone: ---

caller

    caller [expr]

    Returns the context of any active subroutine call (a shell function or a
script executed with the . or source builtins).

    Without expr, caller displays the line number and source filename of the
current subroutine call. If a non-negative integer is supplied as expr, caller
displays the line number, subroutine name, and source file corresponding to
that position in the current execution call stack. This extra information may
be used, for example, to print a stack trace. The current frame is frame 0.

    The return value is 0 unless the shell is not executing a subroutine call
or expr does not correspond to a valid position in the call stack.

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