LXR linux/samples/bpf/tracex7

   1#define _GNU_SOURCE
   2
   3#include <stdio.h>
   4#include <unistd.h>
   5#include <bpf/libbpf.h>
   6
   7int 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
  47cleanup:
  48        bpf_link__destroy(link);
  49        bpf_object__close(obj);
  50        return ret ? 0 : 1;
  51}
  52