LXR linux/samples/bpf/spintest

   1#include <stdio.h>
   2#include <unistd.h>
   3#include <linux/bpf.h>
   4#include <string.h>
   5#include <assert.h>
   6#include <sys/resource.h>
   7#include "libbpf.h"
   8#include "bpf_load.h"
   9
  10int main(int ac, char **argv)
  11{
  12        struct rlimit r = {RLIM_INFINITY, RLIM_INFINITY};
  13        long key, next_key, value;
  14        char filename[256];
  15        struct ksym *sym;
  16        int i;
  17
  18        snprintf(filename, sizeof(filename), "%s_kern.o", argv[0]);
  19        setrlimit(RLIMIT_MEMLOCK, &r);
  20
  21        if (load_kallsyms()) {
  22                printf("failed to process /proc/kallsyms\n");
  23                return 2;
  24        }
  25
  26        if (load_bpf_file(filename)) {
  27                printf("%s", bpf_log_buf);
  28                return 1;
  29        }
  30
  31        for (i = 0; i < 5; i++) {
  32                key = 0;
  33                printf("kprobing funcs:");
  34                while (bpf_get_next_key(map_fd[0], &key, &next_key) == 0) {
  35                        bpf_lookup_elem(map_fd[0], &next_key, &value);
  36                        assert(next_key == value);
  37                        sym = ksym_search(value);
  38                        printf(" %s", sym->name);
  39                        key = next_key;
  40                }
  41                if (key)
  42                        printf("\n");
  43                key = 0;
  44                while (bpf_get_next_key(map_fd[0], &key, &next_key) == 0)
  45                        bpf_delete_elem(map_fd[0], &next_key);
  46                sleep(1);
  47        }
  48
  49        return 0;
  50}
  51