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