samples/bpf/tracex7_user.c

   1 #define _GNU_SOURCE
   2
   3 #include <stdio.h>
   4 #include <unistd.h>
   5 #include <bpf/libbpf.h>
   6
   7 int main(int argc, char **argv)
   8 {
   9         struct bpf_link *link = NULL;
  10         struct bpf_program *prog;
  11         struct bpf_object *obj;
  12         char filename[256];
  13         char command[256];
  14         int ret = 0;
  15         FILE *f;
  16
  17         snprintf(filename, sizeof(filename), "%s_kern.o", argv[0]);
  18         obj = bpf_object__open_file(filename, NULL);
  19         if (libbpf_get_error(obj)) {
  20                 fprintf(stderr, "ERROR: opening BPF object file failed\n");
  21                 return 0;
  22         }
  23
  24         prog = bpf_object__find_program_by_name(obj, "bpf_prog1");
  25         if (!prog) {
  26                 fprintf(stderr, "ERROR: finding a prog in obj file failed\n");
  27                 goto cleanup;
  28         }
  29
  30         /* load BPF program */
  31         if (bpf_object__load(obj)) {
  32                 fprintf(stderr, "ERROR: loading BPF object file failed\n");
  33                 goto cleanup;
  34         }
  35
  36         link = bpf_program__attach(prog);
  37         if (libbpf_get_error(link)) {
  38                 fprintf(stderr, "ERROR: bpf_program__attach failed\n");
  39                 link = NULL;
  40                 goto cleanup;
  41         }
  42
  43         snprintf(command, 256, "mount %s tmpmnt/", argv[1]);
  44         f = popen(command, "r");
  45         ret = pclose(f);
  46
  47 cleanup:
  48         bpf_link__destroy(link);
  49         bpf_object__close(obj);
  50         return ret ? 0 : 1;
  51 }