From: Vincent Lefevre <vincent@vinc17.net>
To: zsh-workers@zsh.org
Subject: Re: suspend (^Z) behavior while a function is running is unclear
Date: Mon, 20 Feb 2012 19:33:35 +0100 [thread overview]
Message-ID: <20120220183335.GE7797@xvii.vinc17.org> (raw)
In-Reply-To: <120220094100.ZM359@torch.brasslantern.com>
On 2012-02-20 09:41:00 -0800, Bart Schaefer wrote:
> On Feb 20, 4:35pm, Peter Stephenson wrote:
> > Subject: Re: suspend (^Z) behavior while a function is running is unclear
> >
> > On Mon, 20 Feb 2012 17:09:45 +0100
> > Vincent Lefevre <vincent@vinc17.net> wrote:
> > > Now I'm thinking whether there should be an option to control that.
> > > Indeed, some functions may fail to work correctly if they are suspended
> > > in such a way. Some functions or { list } could be marked as not
> > > backgroundable, e.g. by setting an option at the beginning, in which
> > > case the ^Z could be ignored.
>
> This is already partly in place:
>
> 2011-08-14 Barton E. Schaefer <schaefer@zsh.org>
>
> * 29677: Src/exec.c, Src/signals.c, Src/zsh.h: flag jobs that are
> builtins running in the current shell, and if they control a
> pipeline, do not allow the external processes in that pipeline to
> become suspended when the foreground shell cannot suspend.
>
> torch% foreach foo (a b c) { sleep 5 } | :
> zsh: job can't be suspended
However if the command outputs something, one loses the output.
> > Useful, but I'm not sure an option is the right way of doing this... I
> > should think you'd want to do something like:
> >
> > {
> > stty susp undef
> > ...
> > } always {
> > stty susp '^z'
> > }
>
> I'm not sure that's the right semantics. Does one want to disable the
> tty suspend character or just ingore the TSTP signal? What if "emacs"
> in the original example was replaced by running another shell?
The ^Z should affect only the other shell. So, I think this is OK.
But with the encapsulation (to save typing), this is very limited.
For instance, one cannot use a complex command like:
nosuspend for i in ...
or even use a function after "nosuspend".
--
Vincent Lefèvre <vincent@vinc17.net> - Web: <http://www.vinc17.net/>
100% accessible validated (X)HTML - Blog: <http://www.vinc17.net/blog/>
Work: CR INRIA - computer arithmetic / AriC project (LIP, ENS-Lyon)
next prev parent reply other threads:[~2012-02-20 18:33 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-02-20 13:02 Vincent Lefevre
2012-02-20 15:13 ` Peter Stephenson
2012-02-20 16:09 ` Vincent Lefevre
2012-02-20 16:35 ` Peter Stephenson
2012-02-20 17:41 ` Bart Schaefer
2012-02-20 18:33 ` Vincent Lefevre [this message]
2012-02-20 18:53 ` Bart Schaefer
2012-02-20 19:21 ` Vincent Lefevre
2012-02-20 19:48 ` Mikael Magnusson
2012-02-21 3:27 ` Bart Schaefer
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