root/samples/bpf/tracex4_user.c

DEFINITIONS

1. time_get_ns
2. print_old_objects
3. main

   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 
  17 struct pair {
  18         long long val;
  19         __u64 ip;
  20 };
  21 
  22 static __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 
  30 static 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 
  50 int 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 }