/usr/share/radare/gradare/Debugger/Stop is in radare-gtk 1:1.5.2-6.
This file is owned by root:root, with mode 0o755.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 | #!/bin/sh
if [ -z "$DPID" ]; then
echo ":!echo $DPID > /tmp/dpid"
fi
DPID=`cat /tmp/dpid`
if [ -z "$DPID" ]; then
echo Oops > /dev/stderr
fi
kill -STOP $DPID
|