note 81317 added to function.proc-open

It took me a long time (and three consecutive projects) to figure this out. Because popen() and proc_open() return valid processes even when the command failed it's awkward to determine when it really has failed if you're opening a non-interactive process like "sendmail -t". I had previously guess that reading from STDERR immediately after starting the process would work, and it does... but when the command is successful PHP just hangs because STDERR is empty and it's waiting for data to be written to it. The solution is a simple stream_set_blocking($pipes[2], 0) immediately after calling proc_open(). <?php $this->_proc = proc_open($command, $descriptorSpec, $pipes); stream_set_blocking($pipes[2], 0); if ($err = stream_get_contents($pipes[2])) { throw new Swift_Transport_TransportException( 'Process could not be started [' . $err . ']' ); } ?> If the process is opened successfully $pipes[2] will be empty, but if it failed the bash/sh error will be in it. Finally I can drop all my "workaround" error checking. I realise this solution is obvious and I'm not sure how it took me 18 months to figure it out, but hopefully this will help someone else. NOTE: Make sure your descriptorSpec has ( 2 => array('pipe', 'w')) for this to work. ---- Server IP: 117.104.160.194 Probable Submitter: 58.160.93.53 ---- Manual Page -- http://www.php.net/manual/en/function.proc-open.php Edit -- https://master.php.net/note/edit/81317 Del: integrated -- https://master.php.net/note/delete/81317/integrated Del: useless -- https://master.php.net/note/delete/81317/useless Del: bad code -- https://master.php.net/note/delete/81317/bad+code Del: spam -- https://master.php.net/note/delete/81317/spam Del: non-english -- https://master.php.net/note/delete/81317/non-english Del: in docs -- https://master.php.net/note/delete/81317/in+docs Del: other reasons-- https://master.php.net/note/delete/81317 Reject -- https://master.php.net/note/reject/81317 Search -- https://master.php.net/manage/user-notes.php