hash.zig

const std = @import("std");
const bpf = @import("bpf");
const exit = bpf.exit;

var hash = bpf.Map.HashMap("hash", u32, u32, 2, 0).init();

export fn test_hash() linksection("xdp") c_int {
    const nonexist = hash.lookup(2);
    if (nonexist != null) exit(@src(), @as(c_long, 1));

    if (hash.lookup(0)) |v| {
        if (v.* != 1) exit(@src(), @as(c_long, 1));
    } else exit(@src(), @as(c_long, 1));

    hash.delete(0);
    hash.update(.noexist, 1, 2);
    return 0;
}