1 // SPDX-License-Identifier: GPL-2.0
2 /* Copyright (c) 2021 Facebook */
5 #include <bpf/bpf_helpers.h>
6 #include <bpf/bpf_tracing.h>
8 /* modifiers and typedefs are ignored when comparing key/value types */
9 typedef struct my_key { long x; } key_type;
10 typedef struct my_value { long x; } value_type;
13 __uint(max_entries, 16);
14 __type(key, key_type);
15 __type(value, value_type);
16 __uint(type, BPF_MAP_TYPE_HASH);
20 __uint(type, BPF_MAP_TYPE_ARRAY);
23 __uint(max_entries, 8);
26 /* this definition will lose, but it has to exactly match the winner */
28 __uint(type, BPF_MAP_TYPE_ARRAY);
31 __uint(max_entries, 16);
32 } map_weak __weak SEC(".maps");
38 SEC("raw_tp/sys_enter")
39 int BPF_PROG(handler_enter2)
41 /* update values with key = 2 */
43 key_type key_struct = { .x = 2 };
44 value_type val_struct = { .x = 2000 };
46 bpf_map_update_elem(&map1, &key_struct, &val_struct, 0);
47 bpf_map_update_elem(&map2, &key, &val, 0);
48 bpf_map_update_elem(&map_weak, &key, &val, 0);
53 SEC("raw_tp/sys_exit")
54 int BPF_PROG(handler_exit2)
56 /* lookup values with key = 1, set in another file */
58 key_type key_struct = { .x = 1 };
59 value_type *value_struct;
61 value_struct = bpf_map_lookup_elem(&map1, &key_struct);
63 output_first2 = value_struct->x;
65 val = bpf_map_lookup_elem(&map2, &key);
67 output_second2 = *val;
69 val = bpf_map_lookup_elem(&map_weak, &key);
76 char LICENSE[] SEC("license") = "GPL";