bpf/progs/sample_map_ret0.c

0001 /* SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause) */
0002 #include <linux/bpf.h>
0003 #include <bpf/bpf_helpers.h>
0004
0005 struct {
0006     __uint(type, BPF_MAP_TYPE_HASH);
0007     __type(key, __u32);
0008     __type(value, long);
0009     __uint(max_entries, 2);
0010 } htab SEC(".maps");
0011
0012 struct {
0013     __uint(type, BPF_MAP_TYPE_ARRAY);
0014     __type(key, __u32);
0015     __type(value, long);
0016     __uint(max_entries, 2);
0017 } array SEC(".maps");
0018
0019 /* Sample program which should always load for testing control paths. */
0020 SEC(".text") int func()
0021 {
0022     __u64 key64 = 0;
0023     __u32 key = 0;
0024     long *value;
0025
0026     value = bpf_map_lookup_elem(&htab, &key);
0027     if (!value)
0028         return 1;
0029     value = bpf_map_lookup_elem(&array, &key64);
0030     if (!value)
0031         return 1;
0032
0033     return 0;
0034 }