import sys

const prot {
	read  0x1
	write 0x2
}

const map {
	private   0x02
	anonymous 0x1000
}

alloc(length Int) -> []Int8 {
	x := sys.mmap(0, length+8, prot.read|prot.write, map.private|map.anonymous)

	if x < 0x1000 {
		return x
	}

	store(x, 8, length)
	return x + 8
}