Re: [Bug-XBoard] Infinite recursion

[Byrial Jensen]

Den 12-04-2012 11:54, h.g. muller skrev:
> > If Xboard is dependent on untranslated error messages from libc, it 
> > should run the engines in the C locale. It can be done by calling 
> > putenv("LANGUAGE=C") in the child proces before the exec() call.
>
> It is not that simple. One would want the engines to run in the same 
> locale as XBoard, in order to get translation of the engine-defined 
> options in the Engine Settings dialogs. The libc messages that are 
> recognized by XBoard are supposed to come from intermediaries like 
> ssh, which you typically use when you run the engines on a remote 
> machine (using -firstHost, -secondHost). This is needed because such 
> interediaries might not exit when they fail to execute the engine 
> binary. The engine itself, when run locally, can inform XBoard of its 
> failure to start by simply quitting. Failure to exectute the engine is 
> announced by XBoard to itself (i.e. from the child process to the main 
> process through the pipe) using perror(), which presumably would use 
> the current locale. So perhaps we should make the child switch to the 
> C locale after exec failure, before using perror(). Is that possible?

Yes it is possible to change locale at any time. In order to force 
gettext to notice the change, you can use the this code according to the 
gettext manual:

              extern int  _nl_msg_cat_cntr;
              ++_nl_msg_cat_cntr;

However if exec fails, or if the child cannot change to the engine 
directory, it could just send some recognizable code which an engine 
never would use, followed by the localized perror() message.