F_ULOCK
case F_ULOCK:
if (lockf(fileno(fp), F_ULOCK, (off_t)0) == -1)
if (lockf(fd, F_ULOCK, 0) == -1)
if (lockf(fd, F_ULOCK, 0) == -1)
if (lockf(fd, F_ULOCK, size) == -1)
i = lockf (fd, F_ULOCK, 0);