samples/bpf/spintest_user.c

   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
  10 int 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_map_get_next_key(map_fd[0], &key, &next_key) == 0) {
  35                         bpf_map_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_map_get_next_key(map_fd[0], &key, &next_key) == 0)
  45                         bpf_map_delete_elem(map_fd[0], &next_key);
  46                 sleep(1);
  47         }
  48
  49         return 0;
  50 }