Re: frame-environment

[Juanma Barranquero <lekktu@gmail.com>]

On Sat, Jan 17, 2009 at 16:25, Eli Zaretskii <eliz@gnu.org> wrote:

> In addition, the first part of this bit of `environment's doc string
> is simply a lie:

The docstring for getenv-internal also seems to have problems:

   If optional parameter ENV is a list, then search this list instead of
  `process-environment', and return t when encountering a negative entry.

What does it mean "when encountering a negative entry"?

Then:

  If it is a frame, then this function will ignore `process-environment' and
  will simply look up the variable in that frame's environment.

But the function does:

  if (CONSP (env))
    ;;; [....]
    ;;; this is the non-frame case, then:
    ;;;
  else if (getenv_internal (SDATA (variable), SBYTES (variable),
			    &value, &valuelen, env))
    return make_string (value, valuelen);

and getenv_internal's first lines are:

  /* Try to find VAR in Vprocess_environment first.  */
  if (getenv_internal_1 (var, varlen, value, valuelen,
			 Vprocess_environment))
    return *value ? 1 : 0;

so it seems like the variable is looked up in the process environment
even if ENV is a frame.

Moreover, getenv_internal only looks for one specific variable in the
"frame envionment", namely DISPLAY:

  if (strcmp (var, "DISPLAY") == 0)
    {
       ;;; look for frame parameter 'display
    }

  return 0;


    Juanma