linux - PHP forked process not exit completely and become zombie -

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this question has answer here:

this simplified program.

the test.php daemon program, running there. forks process work on task. once finishing work, forked process exits. when forked process exits, becomes zombie.

how make forked process exit without becoming zombie?

#!/usr/bin/php <?php  while (1) {   sleep(1);    $pid = pcntl_fork();   if (!$pid) {     $mypid = getmypid();       sleep(5);     print "pid=$mypid finish work \n";     exit();   }    sleep(1); } // while   ?>  ./test.php ... daemon running ...  $ ps -ef | grep mqp ubuntu   10084 10073  0 12:21 pts/0    00:00:00 /usr/bin/php ./test.php ubuntu   10085 10073  0 12:21 pts/0    00:00:00 /usr/bin/php ./test.php ubuntu   10074 10073  0 12:21 pts/0    00:00:00 [test.php] <defunct> ubuntu   10075 10073  0 12:21 pts/0    00:00:00 [test.php] <defunct>

in parent process need call pcntl_wait() or pcntl_waitpid() time time. these functions wait until child exits return id , status. resources used child way released os , child not become zombie.

the status of exited child can used pcntl_wexitstatus() , other functions pcntl extension find out how child ended execution (normal termination , exit code returned, terminated ^c, received signal didn't handle a.s.o.)


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