libbpf-tools: update mountsnoop for libbpf 1.0

Switch to libbpf 1.0 mode and adapt libbpf API usage accordingly.

Signed-off-by: Andrii Nakryiko <[email protected]>

libbpf-tools/mountsnoop.c

@@ -237,7 +237,6 @@ int main(int argc, char **argv)
  .parser = parse_arg,
  .doc = argp_program_doc,
  };
- struct perf_buffer_opts pb_opts;
  struct perf_buffer *pb = NULL;
  struct mountsnoop_bpf *obj;
  int err;
@@ -246,11 +245,7 @@ int main(int argc, char **argv)
  if (err)
  return err;
 
- err = bump_memlock_rlimit();
- if (err) {
- warn("failed to increase rlimit: %d\n", err);
- return 1;
- }
+ libbpf_set_strict_mode(LIBBPF_STRICT_ALL);
 
  obj = mountsnoop_bpf__open();
  if (!obj) {
@@ -272,11 +267,10 @@ int main(int argc, char **argv)
  goto cleanup;
  }
 
- pb_opts.sample_cb = handle_event;
- pb_opts.lost_cb = handle_lost_events;
- pb = perf_buffer__new(bpf_map__fd(obj->maps.events), PERF_BUFFER_PAGES, &pb_opts);
- err = libbpf_get_error(pb);
- if (err) {
+ pb = perf_buffer__new(bpf_map__fd(obj->maps.events), PERF_BUFFER_PAGES,
+ handle_event, handle_lost_events, NULL, NULL);
+ if (!pb) {
+ err = -errno;
  warn("failed to open perf buffer: %d\n", err);
  goto cleanup;
  }
@@ -295,8 +289,8 @@ int main(int argc, char **argv)
 
  while (!exiting) {
  err = perf_buffer__poll(pb, PERF_POLL_TIMEOUT_MS);
- if (err < 0 && errno != EINTR) {
- fprintf(stderr, "error polling perf buffer: %s\n", strerror(errno));
+ if (err < 0 && err != -EINTR) {
+ fprintf(stderr, "error polling perf buffer: %s\n", strerror(-err));
  goto cleanup;
  }
  /* reset err to return 0 if exiting */