lock_dev
if ((*lock_fd = lock_dev(fname, &stat_buf)) == -1) {
static int lock_dev(char *, struct stat *);
if ((*lock_fd = lock_dev(fname, &stat_buf)) == -1) {
(void) lock_dev(NULL, NULL);
lock_dev();
lock_dev();
lock_dev();
lock_dev();
lock_dev();
lock_dev();
static void lock_dev(void);