* tmpbuf.h: New file.

* flock.cc: Include tmpbuf.h for new tmpbuf functionality.
(allow_others_to_sync): Use tmpbuf rather than tmp_pathbuf.  Explain why.
(lf_setlock): For consistency, use tmpbuf rather than tmp_pathbuf.
(lf_getlock): Ditto.

winsup/cygwin/tmpbuf.h

@@ -0,0 +1,27 @@
+/* tmpbuf.h
+
+   Copyright 2010 Red Hat, Inc.
+
+This software is a copyrighted work licensed under the terms of the
+Cygwin license.  Please consult the file "CYGWIN_LICENSE" for
+details. */
+
+#ifndef _TMPBUF_H
+#define _TMPBUF_H
+class tmpbuf
+{
+  void *buf;
+public:
+  tmpbuf (size_t size = NT_MAX_PATH)
+  {
+    buf = calloc (1, size);
+    if (!buf)
+      api_fatal ("allocation of temporary buffer failed");
+  }
+  operator void * () {return buf;}
+  operator char * () {return (char *) buf;}
+  operator PSECURITY_DESCRIPTOR () {return (PSECURITY_DESCRIPTOR) buf;}
+  PSECURITY_DESCRIPTOR operator -> () {return  (PSECURITY_DESCRIPTOR) buf;}
+  ~tmpbuf () {free (buf);}
+};
+#endif /*_TMPBUF_H*/