libc/test/src/unistd/linkat_test.cpp

   1 //===-- Unittests for linkat ----------------------------------------------===//
   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/errno/libc_errno.h"
  10 #include "src/fcntl/open.h"
  11 #include "src/unistd/close.h"
  12 #include "src/unistd/linkat.h"
  13 #include "src/unistd/unlink.h"
  14 #include "test/UnitTest/ErrnoSetterMatcher.h"
  15 #include "test/UnitTest/Test.h"
  16
  17 #include <sys/stat.h>
  18
  19 TEST(LlvmLibcLinkatTest, CreateAndUnlink) {
  20   using LIBC_NAMESPACE::testing::ErrnoSetterMatcher::Succeeds;
  21   constexpr const char *FILENAME = "testdata";
  22   auto TEST_DIR = libc_make_test_file_path(FILENAME);
  23   constexpr const char *FILENAME2 = "linkat.test";
  24   auto TEST_FILE = libc_make_test_file_path(FILENAME2);
  25   constexpr const char *FILENAME3 = "testdata/linkat.test";
  26   auto TEST_FILE_PATH = libc_make_test_file_path(FILENAME3);
  27   constexpr const char *FILENAME4 = "linkat.test.link";
  28   auto TEST_FILE_LINK = libc_make_test_file_path(FILENAME4);
  29   constexpr const char *FILENAME5 = "testdata/linkat.test.link";
  30   auto TEST_FILE_LINK_PATH = libc_make_test_file_path(FILENAME5);
  31
  32   // The test strategy is as follows:
  33   //   1. Create a normal file
  34   //   2. Create a link to that file.
  35   //   3. Open the link to check that the link was created.
  36   //   4. Cleanup the file and its link.
  37   LIBC_NAMESPACE::libc_errno = 0;
  38   int write_fd =
  39       LIBC_NAMESPACE::open(TEST_FILE_PATH, O_WRONLY | O_CREAT, S_IRWXU);
  40   ASSERT_ERRNO_SUCCESS();
  41   ASSERT_GT(write_fd, 0);
  42   ASSERT_THAT(LIBC_NAMESPACE::close(write_fd), Succeeds(0));
  43
  44   int dir_fd = LIBC_NAMESPACE::open(TEST_DIR, O_DIRECTORY);
  45   ASSERT_THAT(
  46       LIBC_NAMESPACE::linkat(dir_fd, TEST_FILE, dir_fd, TEST_FILE_LINK, 0),
  47       Succeeds(0));
  48
  49   int link_fd = LIBC_NAMESPACE::open(TEST_FILE_LINK_PATH, O_PATH);
  50   ASSERT_GT(link_fd, 0);
  51   ASSERT_ERRNO_SUCCESS();
  52   ASSERT_THAT(LIBC_NAMESPACE::close(link_fd), Succeeds(0));
  53
  54   ASSERT_THAT(LIBC_NAMESPACE::unlink(TEST_FILE_PATH), Succeeds(0));
  55   ASSERT_THAT(LIBC_NAMESPACE::unlink(TEST_FILE_LINK_PATH), Succeeds(0));
  56   ASSERT_THAT(LIBC_NAMESPACE::close(dir_fd), Succeeds(0));
  57 }
  58
  59 TEST(LlvmLibcLinkatTest, LinkToNonExistentFile) {
  60   using LIBC_NAMESPACE::testing::ErrnoSetterMatcher::Fails;
  61   ASSERT_THAT(LIBC_NAMESPACE::linkat(AT_FDCWD, "testdata/non-existent-file",
  62                                      AT_FDCWD, "testdata/bad-link", 0),
  63               Fails(ENOENT));
  64 }