1 // SPDX-License-Identifier: GPL-2.0-only
2 /* Copyright (c) 2015 PLUMgrid, http://plumgrid.com
3 */
4 #include <stdio.h>
5 #include <stdlib.h>
6 #include <signal.h>
7 #include <unistd.h>
8 #include <stdbool.h>
9 #include <string.h>
10 #include <time.h>
11
12 #include <bpf/bpf.h>
13 #include <bpf/libbpf.h>
14
15 struct pair {
16 long long val;
17 __u64 ip;
18 };
19
20 static __u64 time_get_ns(void)
21 {
22 struct timespec ts;
23
24 clock_gettime(CLOCK_MONOTONIC, &ts);
25 return ts.tv_sec * 1000000000ull + ts.tv_nsec;
26 }
27
28 static void print_old_objects(int fd)
29 {
30 long long val = time_get_ns();
31 __u64 key, next_key;
32 struct pair v;
33
34 key = write(1, "\e[1;1H\e[2J", 11); /* clear screen */
35
36 key = -1;
37 while (bpf_map_get_next_key(fd, &key, &next_key) == 0) {
38 bpf_map_lookup_elem(fd, &next_key, &v);
39 key = next_key;
40 if (val - v.val < 1000000000ll)
41 /* object was allocated more then 1 sec ago */
42 continue;
43 printf("obj 0x%llx is %2lldsec old was allocated at ip %llx\n",
44 next_key, (val - v.val) / 1000000000ll, v.ip);
45 }
46 }
47
48 int main(int ac, char **argv)
49 {
50 struct bpf_link *links[2];
51 struct bpf_program *prog;
52 struct bpf_object *obj;
53 char filename[256];
54 int map_fd, j = 0;
55
56 snprintf(filename, sizeof(filename), "%s.bpf.o", argv[0]);
57 obj = bpf_object__open_file(filename, NULL);
58 if (libbpf_get_error(obj)) {
59 fprintf(stderr, "ERROR: opening BPF object file failed\n");
60 return 0;
61 }
62
63 /* load BPF program */
64 if (bpf_object__load(obj)) {
65 fprintf(stderr, "ERROR: loading BPF object file failed\n");
66 goto cleanup;
67 }
68
69 map_fd = bpf_object__find_map_fd_by_name(obj, "my_map");
70 if (map_fd < 0) {
71 fprintf(stderr, "ERROR: finding a map in obj file failed\n");
72 goto cleanup;
73 }
74
75 bpf_object__for_each_program(prog, obj) {
76 links[j] = bpf_program__attach(prog);
77 if (libbpf_get_error(links[j])) {
78 fprintf(stderr, "ERROR: bpf_program__attach failed\n");
79 links[j] = NULL;
80 goto cleanup;
81 }
82 j++;
83 }
84
85 while (1) {
86 print_old_objects(map_fd);
87 sleep(1);
88 }
89
90 cleanup:
91 for (j--; j >= 0; j--)
92 bpf_link__destroy(links[j]);
93
94 bpf_object__close(obj);
95 return 0;
96 }
97
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