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           #include <selinux/selinux.h>
           #include <selinux/avc.h>
           int avc_init(const char *msgprefix,
                        const struct avc_memory_callback *mem_callbacks,
                        const struct avc_log_callback *log_callbacks,
                        const struct avc_thread_callback *thread_callbacks,
                        const struct avc_lock_callback *lock_callbacks);


           avc_init  is  deprecated;  please  use  avc_open(3) in conjunction with
           selinux_set_callback(3) in all new code.
           avc_init initializes the userspace AVC and must be  called  before  any
           other  AVC  operation  can  be performed.  A non-NULL msgprefix will be
           prepended to all audit messages produced by  the  userspace  AVC.   The
           default is 'uavc'.  The remaining arguments, if non-NULL, specify call-
           backs to be used by the userspace AVC.


           The userspace AVC can be directed how  to  perform  memory  allocation,
           logging,  thread creation, and locking via callback functions passed to
           avc_init.  The purpose of this functionality is to allow the  userspace
           AVC  to be smoothly integrated into existing userspace object managers.
           Use an avc_memory_callback structure to specify alternate functions for
           dynamic memory allocation.
                  struct avc_memory_callback {
                      void  *(*func_malloc)(size_t size);
                      void  (*func_free)(void *ptr);
           The  two  fields of the structure should be pointers to functions which
           behave as malloc(3) and free(3), which are used by default.
           Use an avc_log_callback structure to specify  alternate  functions  for
                  struct avc_log_callback {
                      void  (*func_log)(const char *fmt, ...);
                      void  (*func_audit)(void *auditdata,
                                          security_class_t class,
                                          char *msgbuf, size_t msgbufsize);
           The func_create_thread callback should create a new thread and return a
           pointer which references it.  The thread should execute the  run  argu-
           ment,   which   does   not   return   under   normal  conditions.   The
           func_stop_thread callback should cancel the running  thread  referenced
           by thread.  By default, threading is not used; see NETLINK NOTIFICATION
           Use an avc_lock_callback structure  to  specify  functions  to  create,
           obtain, and release locks for use by threads.
                  struct avc_lock_callback {
                      void  *(*func_alloc_lock)(void);
                      void  (*func_get_lock)(void *lock);
                      void  (*func_release_lock)(void *lock);
                      void  (*func_free_lock)(void *lock);
           The  func_alloc_lock  callback  should  create  a new lock, returning a
           pointer which references it.  The func_get_lock callback should  obtain
           lock,  blocking  if  necessary.   The func_release_lock callback should
           release lock.  The func_free_lock callback should destroy lock, freeing
           any  resources associated with it.  The default behavior is not to per-
           form any locking.  Note that undefined behavior may result if threading
           is used without appropriate locking.


           Beginning  with version 2.6.4, the Linux kernel supports SELinux status
           change notification via  netlink.   Two  message  types  are  currently
           implemented, indicating changes to the enforcing mode and to the loaded
           policy in the kernel, respectively.   The  userspace  AVC  listens  for
           these messages and takes the appropriate action, modifying the behavior
           of avc_has_perm(3) to reflect the current enforcing mode  and  flushing
           the cache on receipt of a policy load notification.  Audit messages are
           produced when netlink notifications are processed.
           In the default single-threaded mode, the userspace AVC checks  for  new
           netlink  messages  at the start of each permission query.  If threading
           and locking callbacks are  passed  to  avc_init  however,  a  dedicated
           thread  will  be  started  to  listen  on the netlink socket.  This may
           increase performance and will ensure that log  messages  are  generated
           immediately rather than at the time of the next permission query.


           Functions  with a return value return zero on success.  On error, -1 is
           returned and errno is set appropriately.


           The msgprefix argument to avc_init currently has a length limit  of  15


           avc_open(3), selinux_set_callback(3), selinux(8)
                                      27 May 2004                      avc_init(3)

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