Re: Building loadable builtin

[Chet Ramey]

On 4/14/22 1:48 PM, Robert E. Griffith wrote:

> Are there any resources available for understanding the bash internals more?

Only the source code.

> Is this an appropriate place to ask questions on that or is there better 
> place for that?

You can ask on help-bash too, since this isn't really a bug per se. You'll
get help here, though.

> Currently I am trying to figure out how to properly create a nameref var.  
> I specified the att_nameref attribute to make_local_variable but when I 
> examine the variable back in the script it is a simple variable and not a 
> nameref. I see specific functions in variables.h for creating arrays but 
> not one for namerefs.
>
>     in builtin..
>          // local -n this="$oid"
>          SHELL_VAR* this=make_local_variable("this",att_nameref);

That's not the right set of flags for make_local_variable. The constants in
variables.h beginning with MKLOC_ are the ones for the `flags' argument.
You set a variable's attributes separately from creating it.

What you probably want is something like

        this = make_local_variable("this", 0);
        if (this)
                VSETATTR(this, att_nameref);

(not knowing what else you're doing).


--
``The lyf so short, the craft so long to lerne.'' - Chaucer
                 ``Ars longa, vita brevis'' - Hippocrates
Chet Ramey, UTech, CWRU    chet@case.edu    http://tiswww.cwru.edu/~chet/