.. master:: int valid_exec(string name, object ob, object obfrom)

  Validate the rebinding of an IP connection by usage of :efun:`exec`. Arguments are the :arg:`name` of the _program_ attempting to rebind the connection, the object :arg:`ob` to receive the connection, and the object :arg:`obfrom` giving the connection. Note that the program name is not the :efun:`object_name` of the object, and has no leading slash.

  Return 0 to disallow the action, any other value to allow it.

  .. seealso:: :efun:`exec`