flock() Permission denied error

[Marc]

Hello,
when using flock() I get a permission denied error:

Warning: fopen("<filenam e>", "r+") - Permission denied in <pathtofile>
on line 7

I do this:

$fileToOpen=sub str($PHP_SELF, strrpos($PHP_SE LF,"/")+1);
$fileHandle=fop en($fileToOpen, 'r+') or die($php_erorms g);
flock($fileHand le,LOCK_EX | LOCK_NB);
$fileString=fre ad($fileHandle, filesize($fileT oOpen)) or
die($php_erorms g);

// ,,
// procesing of filecontents
// ,,

rewind($fileHan dle);
if(-1==fwrite($file Handle,$newFile )) {die($php_error msg);}
ftruncate($file Handle, ftell($fileHand le)) or die($php_errorm sg);
flock($fileHand le,LOCK_UN);
fclose($fileHan dle);

It seems to me that I incorrectly place the flock()'s but the manual
suggest putting flock($fileHand le,LOCK_EX) after the fopen() and the
flock($fileHand le,LOCK_UN) before the fclose()...

Placing the flock($filehand le, LOCK_UN) just before the fclose()
produces the same result...

All I can do from that point on is to delete the file and use a new
(copy of the unaffected) file...

php4.1.2
MacOSX 10.2

Marc