From: Sebastian Stark <seb-zsh@biskalar.de>
To: zsh-users <zsh-users@zsh.org>
Subject: Re: signal handling via ssh
Date: Mon, 4 Apr 2011 11:25:43 +0200 [thread overview]
Message-ID: <634925AD-3E67-474B-B0FD-480189897687@biskalar.de> (raw)
In-Reply-To: <110401071434.ZM3403@torch.brasslantern.com>
Am 01.04.2011 um 16:14 schrieb Bart Schaefer:
> On Apr 1, 11:27am, Sebastian Stark wrote:
> }
> } ssh -t $server "less +F /var/log/syslog; exec \$SHELL -l"
> }
> } and press '^C' I'm logged off from $server. The '^C' does not seem to
> } go through to only the less process.
> }
> } How can I achieve something like the above but such that ^C does not
> } end the ssh connection?
>
> The ^C is a tty-driver interrupt, which means it's sent to the "process
> group leader" which controls the pseudo-tty allocated by ssh -t. In
> this example the group leader is the entire shell process that has been
> invoked to run those two commands in sequence.
>
> So what you need to do is stop the group leader from reacting to the
> signal while allowing "less" to do so. You can do the first with the
> trap command, but that ignores the signal in all sub-processes as well,
> so you have to restore the signal handling in a new process created
> explicitly for that purpose. It all comes out like this:
>
> ssh -t $server "trap '' INT; \
> (trap - INT && exec less +F /var/log/syslog); \
> exec \$SHELL -l"
Works for me, thank you very much for both, code and explanation!
Sebastian
prev parent reply other threads:[~2011-04-04 9:26 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-04-01 9:27 Sebastian Stark
2011-04-01 14:14 ` Bart Schaefer
2011-04-04 9:25 ` Sebastian Stark [this message]
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