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Linux/samples/bpf/spintest_user.c

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  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 #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                         printf(" %s", sym->name);
 41                         key = next_key;
 42                 }
 43                 if (key)
 44                         printf("\n");
 45                 key = 0;
 46                 while (bpf_map_get_next_key(map_fd[0], &key, &next_key) == 0)
 47                         bpf_map_delete_elem(map_fd[0], &next_key);
 48                 sleep(1);
 49         }
 50 
 51         return 0;
 52 }
 53 

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