sdk/lib/fdio/tests/fdio_fd.cc

// Copyright 2019 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 <lib/fdio/fd.h>
#include <lib/zx/socket.h>
#include <lib/zx/vmo.h>
#include <string.h>
#include <sys/stat.h>
#include <unistd.h>
#include <zircon/syscalls.h>

#include <zxtest/zxtest.h>

TEST(FileDescriptorTest, CreateSocket) {
  zx::socket h1, h2;
  ASSERT_OK(zx::socket::create(0, &h1, &h2));

  int fd = -1;
  ASSERT_OK(fdio_fd_create(h1.release(), &fd));
  ASSERT_LE(0, fd);

  const char* message = "hello, my old friend.";
  ssize_t length = strlen(message);
  ASSERT_EQ(length, write(fd, message, length));
  close(fd);
}

TEST(FileDescriptorTest, CreateVMO) {
  zx::vmo vmo;
  ASSERT_OK(zx::vmo::create(4096, 0, &vmo));

  const char* message = "hello, vmo.";
  ASSERT_OK(vmo.write(message, 0, strlen(message)));

  int fd = -1;
  ASSERT_OK(fdio_fd_create(vmo.release(), &fd));
  ASSERT_LE(0, fd);

  struct stat info = {};
  ASSERT_EQ(0, fstat(fd, &info));
  EXPECT_EQ(4096, info.st_size);

  char buffer[1024];
  memset(buffer, 0, sizeof(buffer));
  ASSERT_EQ(sizeof(buffer), read(fd, buffer, sizeof(buffer)));
  ASSERT_EQ(7, lseek(fd, 7, SEEK_SET));
  EXPECT_EQ(0, strcmp(message, buffer));

  const char* updated = "fd.";
  ASSERT_EQ(4, write(fd, updated, strlen(updated) + 1));

  memset(buffer, 0, sizeof(buffer));
  ASSERT_EQ(sizeof(buffer), pread(fd, buffer, sizeof(buffer), 0u));
  EXPECT_EQ(0, strcmp("hello, fd.", buffer));

  ASSERT_EQ(1, pwrite(fd, "!", 1, 9));
  memset(buffer, 0, sizeof(buffer));
  ASSERT_EQ(sizeof(buffer), pread(fd, buffer, sizeof(buffer), 0u));
  EXPECT_EQ(0, strcmp("hello, fd!", buffer));

  ASSERT_EQ(4096, lseek(fd, 4096, SEEK_SET));
  memset(buffer, 0, sizeof(buffer));
  ASSERT_EQ(0, read(fd, buffer, sizeof(buffer)));

  close(fd);
}

TEST(FileDescriptorTest, CWDClone) {
  zx_handle_t dir = ZX_HANDLE_INVALID;
  ASSERT_EQ(ZX_ERR_NOT_SUPPORTED, fdio_cwd_clone(&dir));
  ASSERT_EQ(ZX_HANDLE_INVALID, dir);
}

TEST(FileDescriptorTest, CloneSocket) {
  zx::socket h1, h2;
  ASSERT_OK(zx::socket::create(0, &h1, &h2));

  int fd = -1;
  ASSERT_OK(fdio_fd_create(h1.release(), &fd));
  ASSERT_LE(0, fd);

  zx_handle_t handle = ZX_HANDLE_INVALID;
  ASSERT_OK(fdio_fd_clone(fd, &handle));
  ASSERT_NE(ZX_HANDLE_INVALID, handle);

  zx_info_handle_basic_t info;
  zx_status_t status =
      zx_object_get_info(handle, ZX_INFO_HANDLE_BASIC, &info, sizeof(info), NULL, NULL);
  ASSERT_OK(status);
  ASSERT_EQ(ZX_OBJ_TYPE_SOCKET, info.type);
  zx_handle_close(handle);

  int fd2 = dup(fd);
  ASSERT_LE(0, fd2);

  ASSERT_OK(fdio_fd_clone(fd, &handle));
  zx_handle_close(handle);

  ASSERT_EQ(0, close(fd));
  ASSERT_EQ(0, close(fd2));
}

TEST(FileDescriptorTest, CloneVMO) {
  zx::vmo vmo;
  ASSERT_OK(zx::vmo::create(4096, 0, &vmo));

  int fd = -1;
  ASSERT_OK(fdio_fd_create(vmo.release(), &fd));
  ASSERT_LE(0, fd);

  zx_handle_t handle = ZX_HANDLE_INVALID;
  ASSERT_OK(fdio_fd_clone(fd, &handle));
  ASSERT_NE(ZX_HANDLE_INVALID, handle);

  zx_info_handle_basic_t info;
  zx_status_t status =
      zx_object_get_info(handle, ZX_INFO_HANDLE_BASIC, &info, sizeof(info), NULL, NULL);
  ASSERT_OK(status);
  ASSERT_EQ(ZX_OBJ_TYPE_VMO, info.type);
  zx_handle_close(handle);

  ASSERT_EQ(0, close(fd));
}

TEST(FileDescriptorTest, TransferSocket) {
  zx_handle_t handle = ZX_HANDLE_INVALID;
  ASSERT_EQ(ZX_ERR_INVALID_ARGS, fdio_fd_transfer(151465, &handle));

  zx::socket h1, h2;
  ASSERT_OK(zx::socket::create(0, &h1, &h2));

  int fd = -1;
  ASSERT_OK(fdio_fd_create(h1.release(), &fd));
  ASSERT_LE(0, fd);

  ASSERT_OK(fdio_fd_transfer(fd, &handle));
  ASSERT_NE(ZX_HANDLE_INVALID, handle);

  zx_info_handle_basic_t info;
  zx_status_t status =
      zx_object_get_info(handle, ZX_INFO_HANDLE_BASIC, &info, sizeof(info), NULL, NULL);
  ASSERT_OK(status);
  ASSERT_EQ(ZX_OBJ_TYPE_SOCKET, info.type);
  zx_handle_close(handle);
  ASSERT_EQ(-1, close(fd));
}

TEST(FileDescriptorTest, TransferVMO) {
  zx::vmo vmo;
  ASSERT_OK(zx::vmo::create(4096, 0, &vmo));

  int fd = -1;
  ASSERT_OK(fdio_fd_create(vmo.release(), &fd));
  ASSERT_LE(0, fd);

  zx_handle_t handle = ZX_HANDLE_INVALID;
  ASSERT_OK(fdio_fd_transfer(fd, &handle));
  ASSERT_NE(ZX_HANDLE_INVALID, handle);

  zx_info_handle_basic_t info;
  zx_status_t status =
      zx_object_get_info(handle, ZX_INFO_HANDLE_BASIC, &info, sizeof(info), NULL, NULL);
  ASSERT_OK(status);
  ASSERT_EQ(ZX_OBJ_TYPE_VMO, info.type);
  zx_handle_close(handle);
  ASSERT_EQ(-1, close(fd));
}

TEST(FileDescriptorTest, TransferAfterDup) {
  zx::socket h1, h2;
  ASSERT_OK(zx::socket::create(0, &h1, &h2));

  int fd = -1;
  ASSERT_OK(fdio_fd_create(h1.release(), &fd));
  ASSERT_LE(0, fd);

  int fd2 = dup(fd);
  ASSERT_LE(0, fd2);

  zx_handle_t handle = ZX_HANDLE_INVALID;
  ASSERT_EQ(ZX_ERR_UNAVAILABLE, fdio_fd_transfer(fd, &handle));
  ASSERT_EQ(ZX_HANDLE_INVALID, handle);

  // Currently, fdio_fd_transfer does not consume |fd| when it returns
  // ZX_ERR_UNAVAILABLE, but we might want to change that in the future.
  ASSERT_EQ(0, close(fd));
  ASSERT_EQ(0, close(fd2));
}

TEST(FileDescriptorTest, DupToSameFdSucceeds) {
  zx::socket h1, h2;
  ASSERT_OK(zx::socket::create(0, &h1, &h2));

  int fd = -1;
  ASSERT_OK(fdio_fd_create(h1.release(), &fd));
  ASSERT_LE(0, fd);

  ASSERT_EQ(fd, dup2(fd, fd));

  const char* message = "hello, my old friend.";
  ssize_t length = strlen(message);
  ASSERT_EQ(length, write(fd, message, length));
  close(fd);
}