LXR linux/samples/bpf/spintest

   1// SPDX-License-Identifier: GPL-2.0
   2#include <stdio.h>
   3#include <unistd.h>
   4#include <linux/bpf.h>
   5#include <string.h>
   6#include <assert.h>
   7#include <sys/resource.h>
   8#include "libbpf.h"
   9#include "bpf_load.h"
  10
  11int main(int ac, char **argv)
  12{
  13        struct rlimit r = {RLIM_INFINITY, RLIM_INFINITY};
  14        long key, next_key, value;
  15        char filename[256];
  16        struct ksym *sym;
  17        int i;
  18
  19        snprintf(filename, sizeof(filename), "%s_kern.o", argv[0]);
  20        setrlimit(RLIMIT_MEMLOCK, &r);
  21
  22        if (load_kallsyms()) {
  23                printf("failed to process /proc/kallsyms\n");
  24                return 2;
  25        }
  26
  27        if (load_bpf_file(filename)) {
  28                printf("%s", bpf_log_buf);
  29                return 1;
  30        }
  31
  32        for (i = 0; i < 5; i++) {
  33                key = 0;
  34                printf("kprobing funcs:");
  35                while (bpf_map_get_next_key(map_fd[0], &key, &next_key) == 0) {
  36                        bpf_map_lookup_elem(map_fd[0], &next_key, &value);
  37                        assert(next_key == value);
  38                        sym = ksym_search(value);
  39                        printf(" %s", sym->name);
  40                        key = next_key;
  41                }
  42                if (key)
  43                        printf("\n");
  44                key = 0;
  45                while (bpf_map_get_next_key(map_fd[0], &key, &next_key) == 0)
  46                        bpf_map_delete_elem(map_fd[0], &next_key);
  47                sleep(1);
  48        }
  49
  50        return 0;
  51}
  52