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[1.7] old-style symlink handle leak


Process Explorer shows that cygwin is leaking handles to dangling old-style 
symlink files during readdir.  Here's a simple testcase:

In cygwin 1.5:
$ mkdir /cygdrive/c/leak
$ ln -s nowhere linkfile

In cygwin 1.7:
$ cd /cygdrive/c/leak
$ uname -a
CYGWIN_NT-5.1 EBLAKE 1.7.0(0.190/5/3) 2008-12-23 16:07 i686 Cygwin
$ echo *

The glob forces bash to do a readdir, where it sees the old-style symlink 
created by cygwin 1.5.  Thereafter, bash owns a handle to 
c:\leak\tmp\linkfile.lnk, because something in cygwin1.dll forgot to close it 
out.

-- 
Eric Blake



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