hid_t               fapl_id;
unsigned            counter;
H5F_object_flush_t *ret_cb;
unsigned *          ret_counter;

/* Create a copy of the file access property list */
fapl_id = H5Pcreate(H5P_FILE_ACCESS);

/* Set up the object flush property values */
/* flush_cb: callback function to invoke when an object flushes (see below) */
/* counter: user data to pass along to the callback function */
H5Pset_object_flush_cb(fapl_id, flush_cb, &counter);

/* Open the file */
file_id = H5Fopen(FILE, H5F_ACC_RDWR, H5P_DEFAULT);

/* Get the file access property list for the file */
fapl = H5Fget_access_plist(file_id);

/* Retrieve the object flush property values for the file */
H5Pget_object_flush_cb(fapl, &ret_cb, &ret_counter);
/* ret_cb will point to flush_cb() */
/* ret_counter will point to counter */

/*
.
.
.
.
.
.
*/

/* The callback function for the object flush property */
static herr_t
flush_cb(hid_t obj_id, void *_udata)
{
    unsigned *flush_ct = (unsigned *)_udata;
    ++(*flush_ct);
    return 0;
}