1
2
3#include "util/bpf_map.h"
4#include <bpf/bpf.h>
5#include <bpf/libbpf.h>
6#include <linux/err.h>
7#include <linux/kernel.h>
8#include <stdbool.h>
9#include <stdlib.h>
10#include <unistd.h>
11
12static bool bpf_map_def__is_per_cpu(const struct bpf_map_def *def)
13{
14 return def->type == BPF_MAP_TYPE_PERCPU_HASH ||
15 def->type == BPF_MAP_TYPE_PERCPU_ARRAY ||
16 def->type == BPF_MAP_TYPE_LRU_PERCPU_HASH ||
17 def->type == BPF_MAP_TYPE_PERCPU_CGROUP_STORAGE;
18}
19
20static void *bpf_map_def__alloc_value(const struct bpf_map_def *def)
21{
22 if (bpf_map_def__is_per_cpu(def))
23 return malloc(round_up(def->value_size, 8) * sysconf(_SC_NPROCESSORS_CONF));
24
25 return malloc(def->value_size);
26}
27
28int bpf_map__fprintf(struct bpf_map *map, FILE *fp)
29{
30 const struct bpf_map_def *def = bpf_map__def(map);
31 void *prev_key = NULL, *key, *value;
32 int fd = bpf_map__fd(map), err;
33 int printed = 0;
34
35 if (fd < 0)
36 return fd;
37
38 if (IS_ERR(def))
39 return PTR_ERR(def);
40
41 err = -ENOMEM;
42 key = malloc(def->key_size);
43 if (key == NULL)
44 goto out;
45
46 value = bpf_map_def__alloc_value(def);
47 if (value == NULL)
48 goto out_free_key;
49
50 while ((err = bpf_map_get_next_key(fd, prev_key, key) == 0)) {
51 int intkey = *(int *)key;
52
53 if (!bpf_map_lookup_elem(fd, key, value)) {
54 bool boolval = *(bool *)value;
55 if (boolval)
56 printed += fprintf(fp, "[%d] = %d,\n", intkey, boolval);
57 } else {
58 printed += fprintf(fp, "[%d] = ERROR,\n", intkey);
59 }
60
61 prev_key = key;
62 }
63
64 if (err == ENOENT)
65 err = printed;
66
67 free(value);
68out_free_key:
69 free(key);
70out:
71 return err;
72}
73
