Pcntl_wait is not interrupted by SIGTERM

Question

According to the PHP docs for pcntl_wait ,

The wait function pauses the execution of the current process until the child exits, or until a signal is delivered whose action is to terminate the current process or call the signal processing function.

However, when I run the following code and send SIGTERM to the parent process with kill -s SIGTERM [pid], the signal handler is called only after exiting it (i.e. I need to wait until sleep is complete. Should I not pcntl_wait()interrupt SIGTERM?

fork_test.php:

<?php
  declare(ticks = 1);

  function sig_handler($signo) {
    switch ($signo) {
      case SIGTERM:
        echo 'SIGTERM' . PHP_EOL;
        break;
      default:
    }
  }

  pcntl_signal(SIGTERM, 'sig_handler');

  $pid = pcntl_fork();

  if ($pid == -1) {
     die('could not fork');
  }
  else if ($pid) {
    echo 'parent' . PHP_EOL;

    pcntl_wait($status);
  }
  else {
    echo 'child' . PHP_EOL;
    sleep(30);
  }
?>

Exit (SIGTERM appears only after waiting 30 seconds):

$ php fork_test.php
child
parent
SIGTERM

PHP Version => 5.3.3

Answer 1

pcntl_signal , . docs, restart_syscalls true. , pcntl_signal , .

flush. , PHP echo .

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