Description:
------------
flock($fp, LOCK_EX | LOCK_NB) returns true even when $fp is already locked.

This happens both on FreeBSD 5.4 and Gentoo Linux and both PHP 5.0.2, 5.0.3 and 5.0.4 exhibits this behaviour but PHP 4.3.11 works as expected.

The blocking version: flock($fp, LOCK_EX) works as expected.

The workaround is to check the value of the "wouldblock" argument to flock() but this shouldn't be necessary and is not documented in the manual.

Reproduce code:
---------------
<?php
$fp = fopen("/tmp/lock.txt", "w+");
if (flock($fp, LOCK_EX | LOCK_NB )) {
  print "Got lock @ ".date('H:i:s');
  while(1) {}
} else {
   echo "Couldn't lock the file.";
}
fclose($fp);
?>


Expected result:
----------------
When a file is already locked flock($fp, LOCK_EX | LOCK_NB) should return false.

First terminal:

% ~/php-5.0.4/sapi/cli/php flock.php                 15:18:34
Got lock @ 15:18:34

Second terminal:

% ~/php-5.0.4/sapi/cli/php flock.php                 15:18:33
Couldn't lock the file.

Actual result:
--------------
First terminal:

% ~/php-5.0.4/sapi/cli/php flock.php                 15:18:34
Got lock @ 15:18:34

Second terminal:

% ~/php-5.0.4/sapi/cli/php flock.php                 15:18:33
Got lock @ 15:18:37