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 <bpf/libbpf.h>
   9 #include "bpf_load.h"
  10 #include "trace_helpers.h"
  11
  12 int main(int ac, char **argv)
  13 {
  14         struct rlimit r = {RLIM_INFINITY, RLIM_INFINITY};
  15         long key, next_key, value;
  16         char filename[256];
  17         struct ksym *sym;
  18         int i;
  19
  20         snprintf(filename, sizeof(filename), "%s_kern.o", argv[0]);
  21         setrlimit(RLIMIT_MEMLOCK, &r);
  22
  23         if (load_kallsyms()) {
  24                 printf("failed to process /proc/kallsyms\n");
  25                 return 2;
  26         }
  27
  28         if (load_bpf_file(filename)) {
  29                 printf("%s", bpf_log_buf);
  30                 return 1;
  31         }
  32
  33         for (i = 0; i < 5; i++) {
  34                 key = 0;
  35                 printf("kprobing funcs:");
  36                 while (bpf_map_get_next_key(map_fd[0], &key, &next_key) == 0) {
  37                         bpf_map_lookup_elem(map_fd[0], &next_key, &value);
  38                         assert(next_key == value);
  39                         sym = ksym_search(value);
  40                         key = next_key;
  41                         if (!sym) {
  42                                 printf("ksym not found. Is kallsyms loaded?\n");
  43                                 continue;
  44                         }
  45
  46                         printf(" %s", sym->name);
  47                 }
  48                 if (key)
  49                         printf("\n");
  50                 key = 0;
  51                 while (bpf_map_get_next_key(map_fd[0], &key, &next_key) == 0)
  52                         bpf_map_delete_elem(map_fd[0], &next_key);
  53                 sleep(1);
  54         }
  55
  56         return 0;
  57 }