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