* cygheap.h (cygheap_fdnew): Avoid setting errno directly since it will have

been set by a previous function.
* dtable.h (dtable::extend): Accept second size_t argument.
* dtable.cc (dtable::extend): Accept second "min" argument which allows
checking for OPEN_MAX_MAX boundary conditions.
(dtable_init): Accommodate second argument to dtable::extend.
(dtable::find_unused_handle): Ditto.
* syscalls.cc (setdtablesize): Ditto.
(dup): Return any error passed by cygheap_fdnew() directly.
(getdtablesize): Just return dtable size directly.

winsup/cygwin/dtable.h

@@ -52,7 +52,7 @@ public:
   void vfork_parent_restore ();
   void vfork_child_fixup ();
   fhandler_base *dup_worker (fhandler_base *oldfh, int flags);
-  int extend (size_t howmuch);
+  int extend (size_t, size_t) __reg3;
   void fixup_after_fork (HANDLE);
   void fixup_close (size_t, fhandler_base *);