rtapi_list.h - RTAPI wrappers for linux kernel functionality

       In kernel space, each rtapi_xxx or RTAPI_XXX identifier is mapped to the underlying kernel functionality,
       if available.

       In  userspace,  or  in  kernels where the underlying functionality is not provided by a kernel, generally
       another implementation--possibly with reduced functionality--is provided.  (For  example,  the  userspace
       implementation for rtapi_device_register always succeeds)

       rtapi_list.h - RTAPI wrappers for linux kernel functionality

       Call  from  init/cleanup  code  and  from realtime tasks.  These functions will cause illegal instruction
       exceptions in non-realtime components, as well as in uspace rtapi_app when it is not setuid root.

       As in Linux.

LinuxCNC Documentation                             2014-06-28                                      funct(3rtapi)

       #include <rtapi_list.h>

       struct rtapi_list_head;

       void rtapi_list_add(struct rtapi_list_head *new_, struct rtapi_list_head *head);

       void rtapi_list_add_tail(struct rtapi_list_head *new_, struct rtapi_list_head *head);

       void rtapi_list_del(struct rtapi_list_head *entry);

       void RTAPI_INIT_LIST_HEAD(struct rtapi_list_head *entry);

       rtapi_list_for_each(pos, head) { ... }

       rtapi_list_entry(ptr, type, member)