code: plan9front

ref: c2a315c78e42a9e161011c7b0559d5d54c103d21
dir: /rc/bin/rcpu/

#!/bin/rc
rfork e

argv0=$0
fn usage {
	echo 'usage:' $argv0 '[-u user] [-k keypattern] [-P patternfile] [-p] [-t timeout] [-h host] [-c cmd arg ...]' >[1=2]
	exit 'usage'
}

fn server {
	mount -nc /fd/0 /mnt/term || exit
	bind -q /mnt/term/dev/cons /dev/cons
	</mnt/term/fd/10 >/mnt/term/fd/11 >[2]/mnt/term/fd/12 {
		~ $#dir 0 || cd $"dir || echo 'can''t change directory: '^$"dir >[1=2]
		switch($#cmd){
		case 0;	cmd=(rc -li)
		case 1; cmd=(rc -lc $cmd)
		case *; cmd=(rc -lc '$*' $cmd)
		}
	 	rm -f /env/^(cmd dir 'fn#server')
	 	service=cpu exec $cmd
	} &
	if(test -d /mnt/term/mnt/cpunote) {
		rfork e
		mainproc=$apid
		{cat; echo -n hangup} </mnt/term/mnt/cpunote/data >/proc/$mainproc/notepg &
		noteproc=$apid
		wait $mainproc
		echo -n $status >/mnt/term/env/rstatus >[2]/dev/null
		echo -n hangup >/proc/$noteproc/notepg
	}
}

fn client {
	echo -n >/env/rstatus
	rfork n
	bind '#|' /mnt/cpunote || exit
	</fd/0 exec $exportfs -r / &
	</dev/null >/mnt/cpunote/data1 {
		fn sigkill { echo -n kill >/mnt/cpunote/data1 }
		fn sighup { echo -n hangup >/mnt/cpunote/data1 }
		fn sigint { status=interrupted }
		wait
		while(~ $status interrupted) {
			echo -n interrupt
			wait
		}
		status=`{cat /env/rstatus}
		exit $"status
	}
}

cmd=()
host='$cpu'
if(~ $#cpu 1) host=$cpu
exportfs=/bin/exportfs
connect=/bin/rconnect

while(~ $1 -*){
	switch($1){
	case -p; connect=($connect $1)
	case *
		~ $#* 1 && usage
		switch($1){
		case -P; exportfs=($exportfs $1 $2)
		case -[ukt]; connect=($connect $1 $2)
		case -h; host=$2
		case -c; cmd=$*(2-); *=()
		case *; usage
		}
		shift
	}
	shift
}
~ $#* 0 || usage

fn pvar {
	while(! ~ $#* 0){
		~ $#$1 0 && echo $1'=()' ||
			path=/dev/null builtin whatis $1
		shift
	}
}

>/env/rscript {
	dir=`{pwd} pvar dir cmd
	builtin whatis server
	echo server
}
exec $connect $host /env/rscript client <[10=0] >[11=1] >[12=2]