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 TEST(LlvmLibcLinkatTest, CreateAndUnlink) {
  18   using LIBC_NAMESPACE::testing::ErrnoSetterMatcher::Succeeds;
  19   constexpr const char *TEST_DIR = "testdata";
  20   constexpr const char *TEST_FILE = "linkat.test";
  21   constexpr const char *TEST_FILE_PATH = "testdata/linkat.test";
  22   constexpr const char *TEST_FILE_LINK = "linkat.test.link";
  23   constexpr const char *TEST_FILE_LINK_PATH = "testdata/linkat.test.link";
  24
  25   // The test strategy is as follows:
  26   //   1. Create a normal file
  27   //   2. Create a link to that file.
  28   //   3. Open the link to check that the link was created.
  29   //   4. Cleanup the file and its link.
  30   libc_errno = 0;
  31   int write_fd =
  32       LIBC_NAMESPACE::open(TEST_FILE_PATH, O_WRONLY | O_CREAT, S_IRWXU);
  33   ASSERT_EQ(libc_errno, 0);
  34   ASSERT_GT(write_fd, 0);
  35   ASSERT_THAT(LIBC_NAMESPACE::close(write_fd), Succeeds(0));
  36
  37   int dir_fd = LIBC_NAMESPACE::open(TEST_DIR, O_DIRECTORY);
  38   ASSERT_THAT(
  39       LIBC_NAMESPACE::linkat(dir_fd, TEST_FILE, dir_fd, TEST_FILE_LINK, 0),
  40       Succeeds(0));
  41
  42   int link_fd = LIBC_NAMESPACE::open(TEST_FILE_LINK_PATH, O_PATH);
  43   ASSERT_GT(link_fd, 0);
  44   ASSERT_EQ(libc_errno, 0);
  45   ASSERT_THAT(LIBC_NAMESPACE::close(link_fd), Succeeds(0));
  46
  47   ASSERT_THAT(LIBC_NAMESPACE::unlink(TEST_FILE_PATH), Succeeds(0));
  48   ASSERT_THAT(LIBC_NAMESPACE::unlink(TEST_FILE_LINK_PATH), Succeeds(0));
  49   ASSERT_THAT(LIBC_NAMESPACE::close(dir_fd), Succeeds(0));
  50 }
  51
  52 TEST(LlvmLibcLinkatTest, LinkToNonExistentFile) {
  53   using LIBC_NAMESPACE::testing::ErrnoSetterMatcher::Fails;
  54   ASSERT_THAT(LIBC_NAMESPACE::linkat(AT_FDCWD, "testdata/non-existent-file",
  55                                      AT_FDCWD, "testdata/bad-link", 0),
  56               Fails(ENOENT));
  57 }