Hey.
That's awesome. Thank you very much, Alex!
> On 6 Jan 2024, at 06:48, Alexander Burger <picolisp@software-lab.de> wrote:
>
> Hi Dmitry,
>
>> Is this newsletter alive?:)
>
> Yes, just not so noisy :)
>
>
>> I'm playing around with `native` and ZeroMQ and found a curious behaviour.
>>
>> (unless (fork)
>> (wait 2000)
>> (bye))
>>
>> (setq Context (native "libzmq.so" "zmq_ctx_new" 'P))
>> (setq ZMQ_REP 4)
>> (setq Socket (native "libzmq.so" "zmq_socket" 'P Context ZMQ_REP))
>> (native "libzmq.so" "zmq_bind" 'I Socket "tcp://*:5555")
>>
>> (buf
>> Buffer 10
>> (prinl "Waiting for messages")
>> (when (= -1 (native "libzmq.so" "zmq_recv" 'I Socket Buffer 10 0))
>> (prinl (pack "Error: " (errno)))))
>
> This looks good.
>
>
>> The `errno` is 4 (which is signal interrupt as i understand).
>
> Yes. EINTR is 4 on most systems. You can see it with
>
> : (sysdefs "errno")
> -> EACCES
> : EINTR
> -> 4
>
> or (vi "@lib/sysdefs").
>
>
>> My assumption here is that `bye` throws some signal? Why else would it affect
>> zeromq in the parent process?
>> Actually, while writing this I found out about SIGCHLD which is apparently
>> sent to parent on child's exit so I guess zmq_recv gets interrupted by that
>> for some reason?
>
> Absolutely correct. The child sends a SIGCHLD signal, which must be handled or
> ignored.
>
> I don't have libzmq at the moment and cannot test it, but I think it should be
> something like
>
> (while (lt0 (native "libzmq.so" "zmq_recv" 'I Socket Buffer 10 0))
> (unless (== EINTR (errno))
> (quit (errno) "Signal") ) )
>
>
>> P.S. completely offtopic but since I'm here. I just noticed that semicolons
>> aren't treated as comments. Why?
>
> Comments in PicoLisp are # or #{...}#.
>
>
>> Can it be enabled? Otherwise my Emacs' lisp-mode comment/uncomment function
>> is
>> useless and no comment highlight either.
>
> There is no built-in way to change it. There are some Emacs libs for PicoLisp,
> but I don't use Emacs and cannot be helpful here.
>
> ☺/ A!ex
>
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