<?php pcntl_waitpid( int $process_id, int &$status, int $flags = 0, array &$resource_usage = []): int
<?php { $this->output .= $this->connection->read()->current(); $status = pcntl_waitpid($this->pid(), $status, WNOHANG | WUNTRACED); if ($status === $this->pid) { return true;