Bug #51836 [Opn->Bgs]: proc_get_status() caused child process exit

Edit report at http://bugs.php.net/bug.php?id=51836&edit=1 ID: 51836 Updated by: mike@php.net Reported by: pcdinh at gmail dot com Summary: proc_get_status() caused child process exit -Status: Open +Status: Bogus Type: Bug Package: Program Execution Operating System: CentOS 5.4 PHP Version: 5.2.13 New Comment: Thank you for taking the time to write to us, but this is not a bug. Please double-check the documentation available at http://www.php.net/manual/ and the instructions on how to report a bug at http://bugs.php.net/how-to-report.php As you keep no reference to the opened pipes of the child, you close it's stdin/stdout, which causes the child to exit because you do not set ignore_user_abort() in the child. Previous Comments: ------------------------------------------------------------------------ [2010-05-17 09:40:29] pcdinh at gmail dot com Re-categorised PCNTL => Program Execution ------------------------------------------------------------------------ [2010-05-17 08:54:22] pcdinh at gmail dot com I am sorry, just submit too fast The expected result should read as follows: Expected result: ---------------- [root@clipserver test]# ./test3.php Parent process ID: 30283 Started process Id Process Id 30284 is running Command used /usr/local/php5-fcgi/bin/php process1.php Process Id 30284 is running Command used /usr/local/php5-fcgi/bin/php process1.php Process Id 30284 is running Command used /usr/local/php5-fcgi/bin/php process1.php Process Id 30284 is running Command used /usr/local/php5-fcgi/bin/php process1.php Process Id 30284 is running Command used /usr/local/php5-fcgi/bin/php process1.php Process Id 30284 is running Command used /usr/local/php5-fcgi/bin/php process1.php Process Id 30284 is running Command used /usr/local/php5-fcgi/bin/php process1.php Process Id 30284 is running Command used /usr/local/php5-fcgi/bin/php process1.php Process Id 30284 is running Command used /usr/local/php5-fcgi/bin/php process1.php Process Id 30284 is running Command used /usr/local/php5-fcgi/bin/php process1.php Process 30284 is running Process 30284 is running Process 30284 is running Process 30284 is running Process 30284 is running Child process 30284 should run in 100 seconds before it can exit. ------------------------------------------------------------------------ [2010-05-17 08:51:20] pcdinh at gmail dot com Description: ------------ I write a script that is able to launch another process which runs in 100 seconds The master process will check the child process in a loop to see if it is still running. The child process is able to launch and run correctly. However, when I asign the resource returned by proc_get_status() to an array and return that array from a function, proc_get_status() does not work correctly any more. It caused the child process exit right after the first call. Called in the same scope ======================== $process = proc_open('/usr/local/php5-fcgi/bin/php process1.php', $descriptors, $pipes); // $process and proc_get_status() in same scope ==> OK $status = proc_get_status($process); if (true === $status['running']) { echo "Started process Id\n"; } else { echo "Unable to start a process\n"; } Called from different scope and against a reference =================================================== Return from a function ====================== return array( 'pid' => $status['pid'], 'handle' => $process ); Called against a reference ========================== foreach ($running as $pid => $info) { // first call will cause child process exit after that $status = proc_get_status($info['handle']); sleep(1); } Test script: --------------- You can read the sample code here: http://gist.github.com/403467 It contains 2 files: a master process named test3.php and a child process named process1.php Expected result: ---------------- [root@clipserver test]# ./test3.php Parent process ID: 30283 Started process Id Process Id 30284 is running Command used /usr/local/php5-fcgi/bin/php process1.php Process Id 30284 is running Command used /usr/local/php5-fcgi/bin/php process1.php Process Id 30284 is running Command used /usr/local/php5-fcgi/bin/php process1.php Process Id 30284 is running Command used /usr/local/php5-fcgi/bin/php process1.php Process Id 30284 is running Command used /usr/local/php5-fcgi/bin/php process1.php Process Id 30284 is running Command used /usr/local/php5-fcgi/bin/php process1.php Process Id 30284 is running Command used /usr/local/php5-fcgi/bin/php process1.php Process Id 30284 is running Command used /usr/local/php5-fcgi/bin/php process1.php Process Id 30284 is running Command used /usr/local/php5-fcgi/bin/php process1.php Process Id 30284 is running Command used /usr/local/php5-fcgi/bin/php process1.php Process 30284 is running Caught a SIGCHLD signal, a worker process exiting Child process 30284 exited with status 0 Command used Termination signal: Is stopped: Stop signal: Process 30284 is not running Process 30284 is not running Process 30284 is not running Actual result: -------------- [root@clipserver test]# ./test3.php Parent process ID: 30283 Started process Id Process Id 30284 is running Command used /usr/local/php5-fcgi/bin/php process1.php Process Id 30284 is running Command used /usr/local/php5-fcgi/bin/php process1.php Process Id 30284 is running Command used /usr/local/php5-fcgi/bin/php process1.php Process Id 30284 is running Command used /usr/local/php5-fcgi/bin/php process1.php Process Id 30284 is running Command used /usr/local/php5-fcgi/bin/php process1.php Process Id 30284 is running Command used /usr/local/php5-fcgi/bin/php process1.php Process Id 30284 is running Command used /usr/local/php5-fcgi/bin/php process1.php Process Id 30284 is running Command used /usr/local/php5-fcgi/bin/php process1.php Process Id 30284 is running Command used /usr/local/php5-fcgi/bin/php process1.php Process Id 30284 is running Command used /usr/local/php5-fcgi/bin/php process1.php Process 30284 is running Caught a SIGCHLD signal, a worker process exiting Child process 30284 exited with status 0 Command used Termination signal: Is stopped: Stop signal: Process 30284 is not running Process 30284 is not running Process 30284 is not running ------------------------------------------------------------------------ -- Edit this bug report at http://bugs.php.net/bug.php?id=51836&edit=1