libc/test/src/unistd/symlink_test.cpp

   1 //===-- Unittests for symlink ---------------------------------------------===//
   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/symlink.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(LlvmLibcSymlinkTest, CreateAndUnlink) {
  20   using LIBC_NAMESPACE::testing::ErrnoSetterMatcher::Succeeds;
  21   constexpr const char *FILENAME = "symlink.test";
  22   auto TEST_FILE_BASE = libc_make_test_file_path(FILENAME);
  23   constexpr const char *FILENAME2 = "symlink.test";
  24   auto TEST_FILE = libc_make_test_file_path(FILENAME2);
  25   constexpr const char *FILENAME3 = "symlink.test.symlink";
  26   auto TEST_FILE_LINK = libc_make_test_file_path(FILENAME3);
  27
  28   // The test strategy is as follows:
  29   //   1. Create a normal file
  30   //   2. Create a symlink to that file.
  31   //   3. Open the symlink to check that the symlink was created.
  32   //   4. Cleanup the file and its symlink.
  33   LIBC_NAMESPACE::libc_errno = 0;
  34   int write_fd = LIBC_NAMESPACE::open(TEST_FILE, O_WRONLY | O_CREAT, S_IRWXU);
  35   ASSERT_ERRNO_SUCCESS();
  36   ASSERT_GT(write_fd, 0);
  37   ASSERT_THAT(LIBC_NAMESPACE::close(write_fd), Succeeds(0));
  38
  39   ASSERT_THAT(LIBC_NAMESPACE::symlink(TEST_FILE_BASE, TEST_FILE_LINK),
  40               Succeeds(0));
  41
  42   int symlink_fd = LIBC_NAMESPACE::open(TEST_FILE_LINK, O_PATH);
  43   ASSERT_GT(symlink_fd, 0);
  44   ASSERT_ERRNO_SUCCESS();
  45   ASSERT_THAT(LIBC_NAMESPACE::close(symlink_fd), Succeeds(0));
  46
  47   ASSERT_THAT(LIBC_NAMESPACE::unlink(TEST_FILE), Succeeds(0));
  48   ASSERT_THAT(LIBC_NAMESPACE::unlink(TEST_FILE_LINK), Succeeds(0));
  49 }
  50
  51 TEST(LlvmLibcSymlinkTest, SymlinkInNonExistentPath) {
  52   using LIBC_NAMESPACE::testing::ErrnoSetterMatcher::Fails;
  53   ASSERT_THAT(LIBC_NAMESPACE::symlink("non-existent-dir/non-existent-file",
  54                                       "non-existent-dir/bad-symlink"),
  55               Fails(ENOENT));
  56 }