Description:
------------
When using the mode parameter in session_save_path (or presumably session.save_path) it will not set the "write" bit correctly for anyone but the owner of the file.  Read and execute bits are set correctly.

This is important b/c I would like to setguid on the session directory so that a non-priveleged user (the website reseller) can clean it out.  That way, all I have to do is add apache to the user's group, and no more problems with clearing out sessions.

Reproduce code:
---------------
<?php
$pm = '0;0600;'.dirname(__FILE__).'/sessions';
session_save_path($pm);
session_start();
die('hello world');
?>

// delete the session file just created

<?php
$pm = '0;0660;'.dirname(__FILE__).'/sessions';
session_save_path($pm);
session_start();
die('hello world');
?>

// delete the session file just created

<?php
$pm = '0;0777;'.dirname(__FILE__).'/sessions';
session_save_path($pm);
session_start();
die('hello world');
?>



Expected result:
----------------
[root@host sessions]# ls -l
total 0
-rw-------  1 apache apache 0 Sep  7 23:30 sess_b1fb...

[root@host sessions]# ls -l
total 0
-rw-rw----  1 apache apache 0 Sep  7 23:31 sess_b1fb...

[root@host sessions]# ls -l
total 0
-rwxrwxrwx  1 apache apache 0 Sep  7 23:40 sess_b1fb...

Actual result:
--------------
[root@host sessions]# ls -l
total 0
-rw-------  1 apache apache 0 Sep  7 23:30 sess_b1fb...

[root@host sessions]# ls -l
total 0
-rw-r-----  1 apache apache 0 Sep  7 23:31 sess_b1fb...
^^^^^^^^^^ <----------------  Permission does not have write bit

[root@host sessions]# ls -l
total 0
-rwxr-xr-x  1 apache apache 0 Sep  7 23:40 sess_b1fb...
^^^^^^^^^^ <----------------  Permission does not have write bits