fuchsia/fuchsia-pty.cc

// Copyright 2020 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 <fuchsia/hardware/pty/llcpp/fidl.h>
#include <lib/fdio/directory.h>
#include <lib/fdio/fd.h>
#include <lib/fdio/io.h>
#include <lib/fdio/unsafe.h>
#include <lib/zx/channel.h>
#include <stdio.h>
#include <zircon/status.h>
#include <zircon/syscalls.h>

#include <utility>

#include "fuchsia-compat.h"

namespace fpty = ::llcpp::fuchsia::hardware::pty;

int fuchsia_open_pty_client(int fd, uint32_t id) {
  zx::channel device_channel, client_channel;
  zx_status_t status = zx::channel::create(0, &device_channel, &client_channel);
  if (status != ZX_OK) {
    fprintf(stderr, "Failed to open PTY client: %s\n", zx_status_get_string(status));
    return -1;
  }

  fdio_t* io = fdio_unsafe_fd_to_io(fd);
  if (io == NULL) {
    fprintf(stderr, "Failed to open PTY client: couldn't create fdio\n");
    return -1;
  }

  auto result = fpty::Device::Call::OpenClient(zx::unowned_channel(fdio_unsafe_borrow_channel(io)),
                                               id, std::move(device_channel));

  fdio_unsafe_release(io);
  if (result.status() != ZX_OK) {
    fprintf(stderr, "Failed to open PTY client: %s\n", zx_status_get_string(result.status()));
    return -1;
  }
  if (result->s != ZX_OK) {
    fprintf(stderr, "Failed to open PTY client: %s\n", zx_status_get_string(result->s));
    return -1;
  }

  int client_fd;
  status = fdio_fd_create(client_channel.release(), &client_fd);
  if (status != ZX_OK) {
    fprintf(stderr, "Failed to open PTY client: %s\n", zx_status_get_string(status));
    return -1;
  }
  return client_fd;
}