Re: zsh 4.3.10 terminates with SIGINT when one types Ctrl-G in emacs under Mac OS X

[Vincent Lefevre <vincent@xxxxxxxxxx>]

On 2009-07-12 14:50:01 -0700, Bart Schaefer wrote:
> This must be happening because either (1) emacs resets the TTY intr
> character to ^G or (2) emacs is sending a SIGINT to the terminal pgrp
> when it sees ^G.  Experimenting with "trap 'stty -a' INT" seems to
> point to the latter, but the SIGINT only makes it through to zsh once
> (or at least the trap fires only on the first ^G).

With zsh 4.3.10, all of them: with the script

trap 'echo INT' INT
/usr/bin/emacs -Q -nw
echo OK

if I hit C-g 4 times, then C-x C-c to quit emacs, I get:

INT
INT
INT
INT
OK

when I run the script with zsh 4.3.10, but just

INT
OK

when I run the script with bash, ksh or zsh 4.2.3.
Why does zsh 4.3.10 behave differently?

> Either way, I think this is a problem with emacs rather than zsh.  Try
> replacing emacs with a command that doesn't do its own input handling
> ("sleep 10", perhaps) and then type the normal intr character (^C).
> Do you expect the script to exit on *that* SIGINT?  [It does.]

With bash, the script exits, even though it doesn't exit in the
case of Ctrl-g in Emacs.

I've searched on Google, and found the explanations of the various
behaviors:

  http://www.cons.org/cracauer/sigint.html

IMHO, zsh should implement WCE, just like bash.

-- 
Vincent Lefèvre <vincent@xxxxxxxxxx> - Web: <http://www.vinc17.org/>
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Work: CR INRIA - computer arithmetic / Arenaire project (LIP, ENS-Lyon)