libc/test/src/unistd/link_test.cpp

   1 //===-- Unittests for link ------------------------------------------------===//
   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/link.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(LlvmLibcLinkTest, CreateAndUnlink) {
  20   using LIBC_NAMESPACE::testing::ErrnoSetterMatcher::Succeeds;
  21   constexpr const char *FILENAME = "link.test";
  22   auto TEST_FILE = libc_make_test_file_path(FILENAME);
  23   constexpr const char *FILENAME2 = "link.test.link";
  24   auto TEST_FILE_LINK = libc_make_test_file_path(FILENAME2);
  25
  26   // The test strategy is as follows:
  27   //   1. Create a normal file
  28   //   2. Create a link to that file.
  29   //   3. Open the link to check that the link was created.
  30   //   4. Cleanup the file and its link.
  31   LIBC_NAMESPACE::libc_errno = 0;
  32   int write_fd = LIBC_NAMESPACE::open(TEST_FILE, O_WRONLY | O_CREAT, S_IRWXU);
  33   ASSERT_ERRNO_SUCCESS();
  34   ASSERT_GT(write_fd, 0);
  35   ASSERT_THAT(LIBC_NAMESPACE::close(write_fd), Succeeds(0));
  36   ASSERT_THAT(LIBC_NAMESPACE::link(TEST_FILE, TEST_FILE_LINK), Succeeds(0));
  37
  38   int link_fd = LIBC_NAMESPACE::open(TEST_FILE_LINK, O_PATH);
  39   ASSERT_GT(link_fd, 0);
  40   ASSERT_ERRNO_SUCCESS();
  41   ASSERT_THAT(LIBC_NAMESPACE::close(link_fd), Succeeds(0));
  42
  43   ASSERT_THAT(LIBC_NAMESPACE::unlink(TEST_FILE), Succeeds(0));
  44   ASSERT_THAT(LIBC_NAMESPACE::unlink(TEST_FILE_LINK), Succeeds(0));
  45 }
  46
  47 TEST(LlvmLibcLinkTest, LinkToNonExistentFile) {
  48   using LIBC_NAMESPACE::testing::ErrnoSetterMatcher::Fails;
  49   ASSERT_THAT(LIBC_NAMESPACE::link("non-existent-file", "bad-link"),
  50               Fails(ENOENT));
  51 }