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bug#5645: 23.1.92; read-event blocks in batch mode


From: Chong Yidong
Subject: bug#5645: 23.1.92; read-event blocks in batch mode
Date: Fri, 26 Feb 2010 19:09:02 -0500
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/23.1.92 (gnu/linux)

Michael Albinus <address@hidden> writes:

> Call
>
> # emacs -Q --batch --eval '(read-event nil nil 0.1)'
>
> It does not return.

This is a technical limitation of batch mode.  Input is acquired via
getchar(): see kbd_buffer_get_event in keyboard.c.  Unfortunately,
getchar() blocks until input in submitted on standard input.






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