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bug#1082: 23.0.60; read-char unexpectedly halts execution of script
From: |
Chong Yidong |
Subject: |
bug#1082: 23.0.60; read-char unexpectedly halts execution of script |
Date: |
Mon, 06 Oct 2008 15:08:44 -0400 |
> Let filter.el consist of the forms:
>
> (defun bc-filter (proc string)
> (message "%s" string))
>
> (message "starting")
> (setq bc (start-process "bc" nil "/usr/bin/bc"))
> (set-process-filter bc 'bc-filter)
>
> (while t
> (let ((char (read-char nil nil 0.1)))
> (message "char: %s" char)))
>
> Where "/usr/bin/bc" is the GNU arbitrary precision calculator. Now:
>
> mt-computer:~ mt$ emacs --script filter.el
> starting
> mt-computer:~ mt$
>
> I expect non-termination in this case, as in eval-buffer on filter.el.
This broke when SYNC_INPUT became the default; it works when Emacs is
recompiled without SYNC_INPUT, like Emacs 22.
I don't know what the specific cause of failure is, however. Maybe the
SYNC_INPUT code should only be active when Emacs is run interactively.
Thoughts?