LXR linux/samples/bpf/tracex4

   1/* Copyright (c) 2015 PLUMgrid, http://plumgrid.com
   2 *
   3 * This program is free software; you can redistribute it and/or
   4 * modify it under the terms of version 2 of the GNU General Public
   5 * License as published by the Free Software Foundation.
   6 */
   7#include <stdio.h>
   8#include <stdlib.h>
   9#include <signal.h>
  10#include <unistd.h>
  11#include <stdbool.h>
  12#include <string.h>
  13#include <time.h>
  14#include <linux/bpf.h>
  15#include "libbpf.h"
  16#include "bpf_load.h"
  17
  18struct pair {
  19        long long val;
  20        __u64 ip;
  21};
  22
  23static __u64 time_get_ns(void)
  24{
  25        struct timespec ts;
  26
  27        clock_gettime(CLOCK_MONOTONIC, &ts);
  28        return ts.tv_sec * 1000000000ull + ts.tv_nsec;
  29}
  30
  31static void print_old_objects(int fd)
  32{
  33        long long val = time_get_ns();
  34        __u64 key, next_key;
  35        struct pair v;
  36
  37        key = write(1, "\e[1;1H\e[2J", 12); /* clear screen */
  38
  39        key = -1;
  40        while (bpf_get_next_key(map_fd[0], &key, &next_key) == 0) {
  41                bpf_lookup_elem(map_fd[0], &next_key, &v);
  42                key = next_key;
  43                if (val - v.val < 1000000000ll)
  44                        /* object was allocated more then 1 sec ago */
  45                        continue;
  46                printf("obj 0x%llx is %2lldsec old was allocated at ip %llx\n",
  47                       next_key, (val - v.val) / 1000000000ll, v.ip);
  48        }
  49}
  50
  51int main(int ac, char **argv)
  52{
  53        char filename[256];
  54        int i;
  55
  56        snprintf(filename, sizeof(filename), "%s_kern.o", argv[0]);
  57
  58        if (load_bpf_file(filename)) {
  59                printf("%s", bpf_log_buf);
  60                return 1;
  61        }
  62
  63        for (i = 0; ; i++) {
  64                print_old_objects(map_fd[1]);
  65                sleep(1);
  66        }
  67
  68        return 0;
  69}
  70