Re: master 9fc3b00373: Improve `restart-emacs' error reporting

Re: master 9fc3b00373: Improve `restart-emacs' error reporting

[Po Lu]

Lars Ingebrigtsen <larsi@gnus.org> writes:

> +      /* Check that the binary hasn't gone away.  */
> +      if (!file_access_p (initial_argv[0], F_OK))
> +	error ("Emacs executable \"%s\" can't be found", initial_argv[0]);
> +    }

How would this work if initial_argv[0] is a binary in the PATH, not a
file name?

Re: master 9fc3b00373: Improve `restart-emacs' error reporting

[Lars Ingebrigtsen]

Po Lu <luangruo@yahoo.com> writes:

> How would this work if initial_argv[0] is a binary in the PATH, not a
> file name?

Oh, it won't.  But I was thinking we'd need to store the actual binary
we're using (because of --chdir/default-directory problems) somewhere,
so I'll be adjusting the test and code from argv[0] to the actual
binary in a while.

-- 
(domestic pets only, the antidote for overdose, milk.)
   bloggy blog: http://lars.ingebrigtsen.no

Re: master 9fc3b00373: Improve `restart-emacs' error reporting

[Philipp Stephani]

Am Mo., 18. Apr. 2022 um 11:14 Uhr schrieb Lars Ingebrigtsen <larsi@gnus.org>:
>
> Po Lu <luangruo@yahoo.com> writes:
>
> > How would this work if initial_argv[0] is a binary in the PATH, not a
> > file name?
>
> Oh, it won't.  But I was thinking we'd need to store the actual binary
> we're using (because of --chdir/default-directory problems) somewhere,
> so I'll be adjusting the test and code from argv[0] to the actual
> binary in a while.

On GNU/Linux, use getauxval(AT_EXECFN) or (probably even better)
getauxval(AT_EXECFD) with fexecve.