libc/test/src/unistd/fchdir_test.cpp

   1 //===-- Unittests for fchdir ----------------------------------------------===//
   2 //
   3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
   4 // See https://llvm.org/LICENSE.txt for license information.
   5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
   6 //
   7 //===----------------------------------------------------------------------===//
   8
   9 #include "src/fcntl/open.h"
  10 #include "src/unistd/close.h"
  11 #include "src/unistd/fchdir.h"
  12 #include "test/ErrnoSetterMatcher.h"
  13 #include "test/UnitTest/Test.h"
  14 #include "utils/testutils/FDReader.h"
  15
  16 #include <errno.h>
  17 #include <fcntl.h>
  18
  19 TEST(LlvmLibcChdirTest, ChangeAndOpen) {
  20   // The idea of this test is that we will first open an existing test file
  21   // without changing the directory to make sure it exists. Next, we change
  22   // directory and open the same file to make sure that the "fchdir" operation
  23   // succeeded.
  24   using __llvm_libc::testing::ErrnoSetterMatcher::Succeeds;
  25   constexpr const char *TEST_DIR = "testdata";
  26   constexpr const char *TEST_FILE = "testdata/fchdir.test";
  27   constexpr const char *TEST_FILE_BASE = "fchdir.test";
  28   errno = 0;
  29
  30   int dir_fd = __llvm_libc::open(TEST_DIR, O_DIRECTORY);
  31   ASSERT_GT(dir_fd, 0);
  32   ASSERT_EQ(errno, 0);
  33   int file_fd = __llvm_libc::open(TEST_FILE, O_PATH);
  34   ASSERT_GT(file_fd, 0);
  35   ASSERT_EQ(errno, 0);
  36   ASSERT_THAT(__llvm_libc::close(file_fd), Succeeds(0));
  37
  38   ASSERT_THAT(__llvm_libc::fchdir(dir_fd), Succeeds(0));
  39   file_fd = __llvm_libc::open(TEST_FILE_BASE, O_PATH);
  40   ASSERT_GT(file_fd, 0);
  41   ASSERT_EQ(errno, 0);
  42   ASSERT_THAT(__llvm_libc::close(file_fd), Succeeds(0));
  43   ASSERT_THAT(__llvm_libc::close(dir_fd), Succeeds(0));
  44 }
  45
  46 TEST(LlvmLibcChdirTest, ChangeToNonExistentDir) {
  47   using __llvm_libc::testing::ErrnoSetterMatcher::Fails;
  48   errno = 0;
  49   ASSERT_EQ(__llvm_libc::fchdir(0), -1);
  50   ASSERT_NE(errno, 0);
  51   errno = 0;
  52 }