From: Michael Albinus <michael.albinus@gmx.de>
To: Ken Brown <kbrown@cornell.edu>
Cc: emacs-devel <emacs-devel@gnu.org>, cygwin@cygwin.com
Subject: Re: Reading D-Bus messages
References: <878w2tx6gk.fsf@gmx.de> <4C9A493F.4050701@cornell.edu>
Date: Thu, 23 Sep 2010 09:19:37 +0200
Message-ID: <874odhyliu.fsf@gmx.de>
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Ken Brown <kbrown@cornell.edu> writes:

> Hi Michael,

Hi Ken,

>> I do not understand all details of keyboard.c. Is there something I need
>> to set in order to urge the call of xd_read_queued_messages (via
>> gobble_input)? Or do I need to suppress further polling? What is the
>> difference for Emacs running with cygwin, compared with the GNU/Linux case?
>>
>> Btw, when I call xd_read_queued_messages inside xd_pending_messages,
>> everything works fine also with cygwin. But I guess this isn't the
>> correct solution.
>
> I don't know enough to attempt an answer.  Is there any chance you
> could write a small self-contained program that exhibits the problem?
> If so, there's a chance someone on the Cygwin list could help.

The problem seems to be how gobble_input is called in kbd_buffer_get_event
(keyboard.c):

/* Note SIGIO has been undef'd if FIONREAD is missing.  */
#ifdef SIGIO
      gobble_input (0);
#endif /* SIGIO */

SIGIO is undefined, and gobble_input is not called under cygwin
therefore. If I remove this conditional directive, D-Bus connections in
Emacs work fine! What is the reason, that SIGIO is undefined under cygwin?

> Ken

Best regards, Michael.

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