POSIX_FADV_NORMAL
CTASSERT(POSIX_FADV_NORMAL == UVM_ADV_NORMAL);
case POSIX_FADV_NORMAL:
CE(posix_fadvise(pipe_fds[0], 0, 0, POSIX_FADV_NORMAL), ESPIPE);
CE(posix_fadvise(badfd, 0, 0, POSIX_FADV_NORMAL), EBADF);
CE(posix_fadvise(fd, 0, 0, POSIX_FADV_NORMAL), 0);
CE(rump_sys_posix_fadvise(rfd, 0, 0, POSIX_FADV_NORMAL), 0);
INT64_MAX-getpagesize(), getpagesize(), POSIX_FADV_NORMAL), 0);