php-src/ext/pcntl/test-pcntl.php

#!/opt/devel/php4/php -q
<?
function alarm_handle($signal){
	 if ($signal==SIGALRM) print "Caught SIGALRM!!!\n";
}
function usr1_handle($signal){
	 if ($signal==SIGUSR1) print "Caught SIGUSR1!!!\n";
}

print "This test will demonstrate a fork followed by ipc via signals.\n";

$pid=pcntl_fork();
if ($pid==0) {
   pcntl_signal(SIGUSR1, "usr1_handle");
   pcntl_signal(SIGALRM, "alarm_handle");
   print "Child: Waiting for alarm.....\n";
   sleep(100);
   print "Child: Waiting for usr1......\n";
   sleep(100);
   print "Child: Resetting Alarm handler to Ignore....\n";
   pcntl_signal(SIGALRM, SIG_IGN);
   sleep(10);
   print "Done\n";
} else {
   print "Parent: Waiting 10 seconds....\n";
   sleep(10);
   print "Parent: Sending SIGALRM to Child\n";
   posix_kill($pid,SIGALRM);
   sleep(1);
   print "Parent: Senging SIGUSR1 to Child\n";
   posix_kill($pid,SIGUSR1);
   sleep(1);
   print "Parent: Sending SIGALRM to Child\n";
   pcntl_waitpid($pid, &$status, $options);
}