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