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         if (!argv[1]) {
  18                 fprintf(stderr, "ERROR: Run with the btrfs device argument!\n");
  19                 return 0;
  20         }
  21
  22         snprintf(filename, sizeof(filename), "%s_kern.o", argv[0]);
  23         obj = bpf_object__open_file(filename, NULL);
  24         if (libbpf_get_error(obj)) {
  25                 fprintf(stderr, "ERROR: opening BPF object file failed\n");
  26                 return 0;
  27         }
  28
  29         prog = bpf_object__find_program_by_name(obj, "bpf_prog1");
  30         if (!prog) {
  31                 fprintf(stderr, "ERROR: finding a prog in obj file failed\n");
  32                 goto cleanup;
  33         }
  34
  35         /* load BPF program */
  36         if (bpf_object__load(obj)) {
  37                 fprintf(stderr, "ERROR: loading BPF object file failed\n");
  38                 goto cleanup;
  39         }
  40
  41         link = bpf_program__attach(prog);
  42         if (libbpf_get_error(link)) {
  43                 fprintf(stderr, "ERROR: bpf_program__attach failed\n");
  44                 link = NULL;
  45                 goto cleanup;
  46         }
  47
  48         snprintf(command, 256, "mount %s tmpmnt/", argv[1]);
  49         f = popen(command, "r");
  50         ret = pclose(f);
  51
  52 cleanup:
  53         bpf_link__destroy(link);
  54         bpf_object__close(obj);
  55         return ret ? 0 : 1;
  56 }