job control from script

job control from script

[rgo]

Hi all. I wrote a little script, but I cannot to learn him to kill all his childs on SIGINT.
#script:
#!/bin/zsh
setopt MONITOR
function TRAPINT () {
    kill %
    return (( $1+128 ))
}
if [[ $1 == "start" ]]; then
    for (( i=0; i<$2; i++ )); do
        $0 dowork
    done
fi
# ... some long time stuff ...

#----end script

Why `kill %' doesn't work? And `kill %NUM'? And how can I fetch job list for use in script?

Re: job control from script

[Bart Schaefer]

On Dec 11,  5:21pm, rgo wrote:
}
} Why `kill %' doesn't work?

What do you expect it to do, and why?

There's no job specifier that means "all jobs".  I've tried both bash and
ksh and "kill %" in those shells kills exactly one job (the most recent
one, as if "kill %+").  Zsh is the same.

} And `kill %NUM'? And how can I fetch job list for use in script?

You can either

	zmodload zsh/parameter
	kill %${(k)^jobstates}

or (if your version of zsh is recent enough that piping the jobs command
produces useful output) use

	jobs -p | while read jnum jpid text; do kill $jpid; done

The easiest thing, though, might be

	setopt MONITOR HUP
	function TRAPINT() { kill -HUP $$ }

which just says that on an INTerrupt, send a HUP signal, which will then
automatically be propagated to all the child processes.

Re: job control from script

[Bart Schaefer]

On Dec 11, 11:34pm, rgo wrote:
}
} > 	jobs -p | while read jnum jpid text; do kill $jpid; done
} 
} zsh-4.2.5 [...] but pipe doesn't work.

Hmm, yes, there's definitely a bug.  Running "jobs" in a subshell of a non-
interactive shell hangs forever, almost as if "wait" had been executed,
even if MONITOR is set.

} > 	setopt MONITOR HUP
} > 	function TRAPINT() { kill -HUP $$ }
} 
} This is really work :). But gives a warning.

Change it to

	function TRAPINT() { exec 2>/dev/null; kill -HUP $$ }

-- 
Bart Schaefer                                 Brass Lantern Enterprises
http://www.well.com/user/barts              http://www.brasslantern.com

Zsh: http://www.zsh.org | PHPerl Project: http://phperl.sourceforge.net