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/fcntl/open.h"
  10 #include "src/unistd/close.h"
  11 #include "src/unistd/linkat.h"
  12 #include "src/unistd/unlink.h"
  13 #include "test/ErrnoSetterMatcher.h"
  14 #include "test/UnitTest/Test.h"
  15
  16 #include <errno.h>
  17
  18 TEST(LlvmLibcLinkatTest, CreateAndUnlink) {
  19   using __llvm_libc::testing::ErrnoSetterMatcher::Succeeds;
  20   constexpr const char *TEST_DIR = "testdata";
  21   constexpr const char *TEST_FILE = "linkat.test";
  22   constexpr const char *TEST_FILE_PATH = "testdata/linkat.test";
  23   constexpr const char *TEST_FILE_LINK = "linkat.test.link";
  24   constexpr const char *TEST_FILE_LINK_PATH = "testdata/linkat.test.link";
  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   errno = 0;
  32   int write_fd = __llvm_libc::open(TEST_FILE_PATH, O_WRONLY | O_CREAT, S_IRWXU);
  33   ASSERT_EQ(errno, 0);
  34   ASSERT_GT(write_fd, 0);
  35   ASSERT_THAT(__llvm_libc::close(write_fd), Succeeds(0));
  36
  37   int dir_fd = __llvm_libc::open(TEST_DIR, O_DIRECTORY);
  38   ASSERT_THAT(__llvm_libc::linkat(dir_fd, TEST_FILE, dir_fd, TEST_FILE_LINK, 0),
  39               Succeeds(0));
  40
  41   int link_fd = __llvm_libc::open(TEST_FILE_LINK_PATH, O_PATH);
  42   ASSERT_GT(link_fd, 0);
  43   ASSERT_EQ(errno, 0);
  44   ASSERT_THAT(__llvm_libc::close(link_fd), Succeeds(0));
  45
  46   ASSERT_THAT(__llvm_libc::unlink(TEST_FILE_PATH), Succeeds(0));
  47   ASSERT_THAT(__llvm_libc::unlink(TEST_FILE_LINK_PATH), Succeeds(0));
  48   ASSERT_THAT(__llvm_libc::close(dir_fd), Succeeds(0));
  49 }
  50
  51 TEST(LlvmLibcLinkatTest, LinkToNonExistentFile) {
  52   using __llvm_libc::testing::ErrnoSetterMatcher::Fails;
  53   ASSERT_THAT(__llvm_libc::linkat(AT_FDCWD, "testdata/non-existent-file",
  54                                   AT_FDCWD, "testdata/bad-link", 0),
  55               Fails(ENOENT));
  56 }