async.each([program.port, program.livereloadPort], function(port, cb) {
processFinder.find(port, function(err, pids) {
if (err) return cb(err);
log.info("Killing process on port %s", port);
pids.forEach(process.kill);
cb();
});
}, callback);
server.start((e) => {
if (e) {
if (e.code === 'EADDRINUSE') {
const finder = require('process-finder')
finder.find({ elevate: false, port: program.port }, (startErr, pids) => {
const msg =
`We were unable to start Gatsby on port ${program.port} as there's already a process
listening on that port (PID: ${pids[0]}). You can either use a different port
(e.g. gatsby serve-build --port ${parseInt(program.port, 10) + 1}) or stop the process
already listening on your desired port.`
console.log(msg)
process.exit()
})
} else {
console.log(e)
}
} else {
if (program.open) {
opn(server.info.uri)
}
console.log('Listening at:', server.info.uri)
}
})