I create a directory as follows:

if ($rc = Mkdir($directory,0777)) { 
	/* Directory created processing */
}

Directory is successfully created.

Some days(or minutes in test) I try to remove the directory in another transaction

/* Code to set up directory name */
/* Code to delete any files in directory - this works */
echo "<br>Directory is $directory";/* diagnostic */
error_reporting(15);
if ($rc = RmDir($directory)) {
	/* code for successful delete */
}
else {
	/* Code for unsuccessful delete */
}

I get the following output, and the empty directory remains.

Directory is d:\argus\fred3\resources\xxx
Warning: RmDir failed (Broken pipe) in d:\argus/fred3/xxx.php3 on line 777

The code works fine Linux.

I looked at function php3_rmdir in file.c, but could see nothing obvious(in my slowly widening
 understanding). If one wanted to put some temporary diagnostic processing in 
file.c for example to print some of the variables to the screen,
what would be the recommended way to do this? 

Best regards. . . Fred