97 lines · c
1// SPDX-License-Identifier: GPL-2.0-only2/* Copyright (c) 2015 PLUMgrid, http://plumgrid.com3 */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 15struct pair {16 long long val;17 __u64 ip;18};19 20static __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 28static 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 48int 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 90cleanup:91 for (j--; j >= 0; j--)92 bpf_link__destroy(links[j]);93 94 bpf_object__close(obj);95 return 0;96}97