LXR linux/samples/bpf/tracex4

   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#include <linux/bpf.h>
  12#include <sys/resource.h>
  13
  14#include <bpf/bpf.h>
  15#include "bpf_load.h"
  16
  17struct pair {
  18        long long val;
  19        __u64 ip;
  20};
  21
  22static __u64 time_get_ns(void)
  23{
  24        struct timespec ts;
  25
  26        clock_gettime(CLOCK_MONOTONIC, &ts);
  27        return ts.tv_sec * 1000000000ull + ts.tv_nsec;
  28}
  29
  30static void print_old_objects(int fd)
  31{
  32        long long val = time_get_ns();
  33        __u64 key, next_key;
  34        struct pair v;
  35
  36        key = write(1, "\e[1;1H\e[2J", 12); /* clear screen */
  37
  38        key = -1;
  39        while (bpf_map_get_next_key(map_fd[0], &key, &next_key) == 0) {
  40                bpf_map_lookup_elem(map_fd[0], &next_key, &v);
  41                key = next_key;
  42                if (val - v.val < 1000000000ll)
  43                        /* object was allocated more then 1 sec ago */
  44                        continue;
  45                printf("obj 0x%llx is %2lldsec old was allocated at ip %llx\n",
  46                       next_key, (val - v.val) / 1000000000ll, v.ip);
  47        }
  48}
  49
  50int main(int ac, char **argv)
  51{
  52        struct rlimit r = {RLIM_INFINITY, RLIM_INFINITY};
  53        char filename[256];
  54        int i;
  55
  56        snprintf(filename, sizeof(filename), "%s_kern.o", argv[0]);
  57
  58        if (setrlimit(RLIMIT_MEMLOCK, &r)) {
  59                perror("setrlimit(RLIMIT_MEMLOCK, RLIM_INFINITY)");
  60                return 1;
  61        }
  62
  63        if (load_bpf_file(filename)) {
  64                printf("%s", bpf_log_buf);
  65                return 1;
  66        }
  67
  68        for (i = 0; ; i++) {
  69                print_old_objects(map_fd[1]);
  70                sleep(1);
  71        }
  72
  73        return 0;
  74}
  75