On Tue, Mar 03, 2009 at 02:48:34AM -0500, Rosen Rosen wrote:
> with reference to the post
> 
> http://community.qnx.com/sf/discussion/do/listPosts/projects.networking/discussion.technology.topc6252
> 
> We are considering modifying ip_input.c on our own as a temporary fix to handle the router alert option. Since nothing
 is passed back from ip_dooptions, we set a global variable inside it if router alert option is spotted. In ip_input(), 
we use the global variable to decide whether to treat the packet as one directed to us.
> 
> This seems to be working, but we are not sure whether it is safe to use a global variable. So we would like to know 
whether ip_input() is a re-entrant ?

A global is OK currently. ip_input is not currently re-entrant.

-seanb