LXR linux/samples/bpf/tracex1

   1// SPDX-License-Identifier: GPL-2.0
   2#include <stdio.h>
   3#include <unistd.h>
   4#include <bpf/libbpf.h>
   5#include "trace_helpers.h"
   6
   7int main(int ac, char **argv)
   8{
   9        struct bpf_link *link = NULL;
  10        struct bpf_program *prog;
  11        struct bpf_object *obj;
  12        char filename[256];
  13        FILE *f;
  14
  15        snprintf(filename, sizeof(filename), "%s_kern.o", argv[0]);
  16        obj = bpf_object__open_file(filename, NULL);
  17        if (libbpf_get_error(obj)) {
  18                fprintf(stderr, "ERROR: opening BPF object file failed\n");
  19                return 0;
  20        }
  21
  22        prog = bpf_object__find_program_by_name(obj, "bpf_prog1");
  23        if (!prog) {
  24                fprintf(stderr, "ERROR: finding a prog in obj file failed\n");
  25                goto cleanup;
  26        }
  27
  28        /* load BPF program */
  29        if (bpf_object__load(obj)) {
  30                fprintf(stderr, "ERROR: loading BPF object file failed\n");
  31                goto cleanup;
  32        }
  33
  34        link = bpf_program__attach(prog);
  35        if (libbpf_get_error(link)) {
  36                fprintf(stderr, "ERROR: bpf_program__attach failed\n");
  37                link = NULL;
  38                goto cleanup;
  39        }
  40
  41        f = popen("taskset 1 ping -c5 localhost", "r");
  42        (void) f;
  43
  44        read_trace_pipe();
  45
  46cleanup:
  47        bpf_link__destroy(link);
  48        bpf_object__close(obj);
  49        return 0;
  50}
  51