     /* Prefix locker_ is reserved */
     #include <mailutils/locker.h>

 -- Function: int locker_create (locker_t * PLOCKER, char *FILENAME, size_t LEN, int FLAGS)

 -- Function: void locker_destroy (locker_t * PLOCKER)

 -- Function: int locker_lock (locker_t LOCKER, int FLAG)

     MU_LOCKER_RDLOCK

     MU_LOCKER_WRLOCK

     MU_LOCKER_PID

     MU_LOCKER_FCNTL

     MU_LOCKER_TIME

 -- Function: int locker_touchlock (locker_t LOCKER)

 -- Function: int locker_unlock (locker_t LOCKER)