[Ecls-list] Embedding ECL (Newbie)

Geoff Cant nem at lisp.geek.nz
Sun Jan 22 17:38:02 UTC 2006

Hi David, the first error after the eval seems to be:
THROW: The catch #:G1 is undefined.
QUAKE> Read or write operation to stream #<input stream "stdin">  
signaled an error.
Explanation: Resource temporarily unavailable.

ECL seems to be trying to invoke the debugger which requires reading
stdin, which fails and so it tries to call the debugger.

Is there anything obvious that would cause the "THROW: The catch #:G1
is undefined" error? Do I need to pass an environment to eval?

Thanks heaps,
--Geoff Cant

David Creelman <dave at geko.net.au> writes:

 > Hi Geoff,
 > Embedding in Quake is interesting. Sounds like fun.
 > A few things.
 > There are a few inlines there instead of static. I think it should be
 > static on those ?
 > my_c_string_to_object is defined, but it's not used anywhere.  
Maybe that
 > will show up some errors.
 > I think nargs should be 3, not 4. It's a count of the args not  
 > the count itself.
 > Also, apparently pointing to obj->string.self is not always safe,
 > because ECL strings are resizable and not guaranteed to be null
 > terminated. Try using ecl_make_null_terminated_string (from  
memory ?) or
 > write a function that wraps the following
 > strncpy(obj->string.self, dest, obj->string.fillp);
 > Also, there's a recurring malloc, free in there. Is it possible to
 > declare it as char lisp_code[200] and not have to worry about the
 > overhead of malloc/free ? This way lisp_code gets looked after on the
 > stack. ECL will make a copy of the string, so you'll be okay  
(works for
 > me).
 > Cheers
 > DC
 > On Mon, 2006-01-23 at 12:03 +1300, Geoff Cant wrote:
 >> Hi there, I'm new to embedding ECL into things and am having trouble
 >> with ecl and Quake 1.
 >> I'm trying to embed ecl into the QuakeWorld client. I've got as  
far as
 >> booting CL and converting strings to cl_objects and back again via
 >> format, but can't figure out how to actually get eval/funcall to  
 >> properly. At the moment, they crash the application with tens of
 >> thousands of recursive calls to:
 >> cl_error
 >> cl_funcall
 >> L36error_type_specifier
 >> L3Universal_Error_Handler
 >> L30coerce_to_condition
 >> cl_typep
 >> The console logs show:
 >> Read or write operation to stream #<input stream "stdin">  
signaled an
 >> error.
 >> Explanation: Resource temporarily unavailable.
 >> Broken at COMMON-LISP:ERROR.
 >>  >>>>>>>>>>>>>>>>>>
 >> My lisp and c code (cribbed from the xchat plugin and vbecl) are
 >> attached.
 >>  In the code I'm trying to use Cmd_Lisp_Eval with a lisp_code  
string of "(+ 1 1)". The crash happens in cl_lisp.c at line 73  
("cl_object result = cl_safe_eval (form, Cnil, NULL);"). Does my eval  
code look reasonable (like it's doing the right things)? As quake is  
a GUI app without a useful stdin/out, what do I need to do in ECL to  
prevent errors due to things trying to read *standard-input* and  
friends? What am I missing in the way of housekeeping (memory  
management, static roots for the GC, ...)? Thanks muchly, -- Geoff Cant
 > --
 > David Creelman
 > GPG: 11CC 0D54 D37A 4B9C 5C65  AB63 5B18 7F99 7D77 9CA5

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