samples/bpf/spintest_user.c

   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
  11 int 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 }