dummy-client

#!/bin/sh

# dummy-client - Weston shell client that does nothing
# but send a signal to Xweston when Weston is ready

PROGNAME=$(basename "$0")

# Find ancestor process given its process name and a starting PID
# Return PID if found, 0 if not found
find_ancestor() {
    local name pid
    name=$1
    pid=$2
    while [ $pid -ne 0 ]; do
	set -- $(ps -o comm= -o ppid= -p $pid)
	[ "$1" = "$name" ] && break
	pid=$2
    done
    echo $pid
}

error() {
    echo "$PROGNAME: Error: $1" >&2
}

# Exit with error if not running under weston (perhaps we were orphaned)
weston_pid=$(find_ancestor "weston" $$)
if [ $weston_pid -eq 0 ]; then
    error "not running under weston"
    exit 1
fi

# Find PID of Xweston, exit with error if not found
xweston_pid=$(find_ancestor "Xweston" $weston_pid)
if [ $xweston_pid -eq 0 ]; then
    error "not started by Xweston"
    # Shutdown weston
    kill -TERM $weston_pid
    # If we exit before weston, we might be respawned. Give it some time
    sleep 1
    exit 1
fi

# Signal Xweston that weston is ready for connections
kill -USR2 $xweston_pid

# Execute the real desktop shell
exec /usr/lib/weston/weston-desktop-shell