1 // SPDX-License-Identifier: GPL-2.0
2 #include <stdio.h>
3 #include <unistd.h>
4 #include <string.h>
5 #include <assert.h>
6 #include <bpf/libbpf.h>
7 #include <bpf/bpf.h>
8 #include "trace_helpers.h"
9
10 int main(int ac, char **argv)
11 {
12 struct bpf_object *obj = NULL;
13 struct bpf_link *links[20];
14 long key, next_key, value;
15 struct bpf_program *prog;
16 int map_fd, i, j = 0;
17 char filename[256];
18 struct ksym *sym;
19
20 if (load_kallsyms()) {
21 printf("failed to process /proc/kallsyms\n");
22 return 2;
23 }
24
25 snprintf(filename, sizeof(filename), "%s.bpf.o", argv[0]);
26 obj = bpf_object__open_file(filename, NULL);
27 if (libbpf_get_error(obj)) {
28 fprintf(stderr, "ERROR: opening BPF object file failed\n");
29 obj = NULL;
30 goto cleanup;
31 }
32
33 /* load BPF program */
34 if (bpf_object__load(obj)) {
35 fprintf(stderr, "ERROR: loading BPF object file failed\n");
36 goto cleanup;
37 }
38
39 map_fd = bpf_object__find_map_fd_by_name(obj, "my_map");
40 if (map_fd < 0) {
41 fprintf(stderr, "ERROR: finding a map in obj file failed\n");
42 goto cleanup;
43 }
44
45 bpf_object__for_each_program(prog, obj) {
46 links[j] = bpf_program__attach(prog);
47 if (libbpf_get_error(links[j])) {
48 fprintf(stderr, "bpf_program__attach failed\n");
49 links[j] = NULL;
50 goto cleanup;
51 }
52 j++;
53 }
54
55 for (i = 0; i < 5; i++) {
56 key = 0;
57 printf("kprobing funcs:");
58 while (bpf_map_get_next_key(map_fd, &key, &next_key) == 0) {
59 bpf_map_lookup_elem(map_fd, &next_key, &value);
60 assert(next_key == value);
61 sym = ksym_search(value);
62 key = next_key;
63 if (!sym) {
64 printf("ksym not found. Is kallsyms loaded?\n");
65 continue;
66 }
67
68 printf(" %s", sym->name);
69 }
70 if (key)
71 printf("\n");
72 key = 0;
73 while (bpf_map_get_next_key(map_fd, &key, &next_key) == 0)
74 bpf_map_delete_elem(map_fd, &next_key);
75 sleep(1);
76 }
77
78 cleanup:
79 for (j--; j >= 0; j--)
80 bpf_link__destroy(links[j]);
81
82 bpf_object__close(obj);
83 return 0;
84 }
85
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