src/devices/bin/lsdev/lsdev.cc

// Copyright 2017 The Fuchsia Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#include <fidl/fuchsia.device/cpp/wire.h>
#include <lib/component/incoming/cpp/protocol.h>
#include <lib/fdio/directory.h>
#include <lib/fdio/fd.h>
#include <lib/fdio/fdio.h>
#include <stdio.h>
#include <zircon/status.h>
#include <zircon/syscalls.h>
#include <zircon/types.h>

int main(int argc, char* argv[]) {
  if (argc < 2) {
    fprintf(stderr, "usage: %s <device path>\n", argv[0]);
    return -1;
  }

  zx::result controller = component::Connect<fuchsia_device::Controller>(argv[1]);
  if (controller.is_error()) {
    fprintf(stderr, "could not open %s: %s\n", argv[1], controller.status_string());
    return -1;
  }

  char path[1025];
  size_t actual_len;

  auto resp = fidl::WireCall(controller.value())->GetTopologicalPath();
  zx_status_t status = resp.status();

  if (status == ZX_OK) {
    if (resp->is_error()) {
      status = resp->error_value();
    } else {
      actual_len = resp->value()->path.size();
      auto& r = *resp->value();
      memcpy(path, r.path.data(), r.path.size());
    }
  }

  if (status != ZX_OK) {
    fprintf(stderr, "could not get topological path for %s: %s\n", argv[1],
            zx_status_get_string(status));
    return -1;
  }
  path[actual_len] = 0;

  printf("topological path for %s: %s\n", argv[1], path);
  return 0;
}