67     private $stderr;  variable in Symfony\\Component\\Process\\Process
576 …== $this->callback || ($yieldOut && !feof($this->stdout)) || ($yieldErr && !feof($this->stderr))) {
592                 $err = stream_get_contents($this->stderr, -1, $this->incrementalErrorOutputOffset);
598                         $this->incrementalErrorOutputOffset = ftell($this->stderr);
640         if (false === $ret = stream_get_contents($this->stderr, -1, 0)) {
663         $latest = stream_get_contents($this->stderr, -1, $this->incrementalErrorOutputOffset);
664         $this->incrementalErrorOutputOffset = ftell($this->stderr);
680         ftruncate($this->stderr, 0);
681         fseek($this->stderr, 0);
925         fseek($this->stderr, 0, \SEEK_END);
926         fwrite($this->stderr, $line);
927         fseek($this->stderr, $this->incrementalErrorOutputOffset);
1564         $this->stderr = fopen('php://temp/maxmemory:'.(1024 * 1024), 'w+b');