xref: /aosp_15_r20/external/llvm-libc/test/src/unistd/symlinkat_test.cpp (revision 71db0c75aadcf003ffe3238005f61d7618a3fead)
1 //===-- Unittests for symlinkat -------------------------------------------===//
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/symlinkat.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 
TEST(LlvmLibcSymlinkatTest,CreateAndUnlink)19 TEST(LlvmLibcSymlinkatTest, CreateAndUnlink) {
20   using LIBC_NAMESPACE::testing::ErrnoSetterMatcher::Succeeds;
21   constexpr const char *FILENAME = "testdata";
22   auto TEST_DIR = libc_make_test_file_path(FILENAME);
23   constexpr const char *FILENAME2 = "symlinkat.test";
24   auto TEST_FILE = libc_make_test_file_path(FILENAME2);
25   constexpr const char *FILENAME3 = "testdata/symlinkat.test";
26   auto TEST_FILE_PATH = libc_make_test_file_path(FILENAME3);
27   constexpr const char *FILENAME4 = "symlinkat.test.link";
28   auto TEST_FILE_LINK = libc_make_test_file_path(FILENAME4);
29   constexpr const char *FILENAME5 = "testdata/symlinkat.test.link";
30   auto TEST_FILE_LINK_PATH = libc_make_test_file_path(FILENAME5);
31 
32   // The test strategy is as follows:
33   //   1. Create a normal file
34   //   2. Create a link to that file.
35   //   3. Open the link to check that the link was created.
36   //   4. Cleanup the file and its link.
37   LIBC_NAMESPACE::libc_errno = 0;
38   int write_fd =
39       LIBC_NAMESPACE::open(TEST_FILE_PATH, O_WRONLY | O_CREAT, S_IRWXU);
40   ASSERT_ERRNO_SUCCESS();
41   ASSERT_GT(write_fd, 0);
42   ASSERT_THAT(LIBC_NAMESPACE::close(write_fd), Succeeds(0));
43 
44   int dir_fd = LIBC_NAMESPACE::open(TEST_DIR, O_DIRECTORY);
45   ASSERT_THAT(LIBC_NAMESPACE::symlinkat(TEST_FILE, dir_fd, TEST_FILE_LINK),
46               Succeeds(0));
47 
48   int link_fd = LIBC_NAMESPACE::open(TEST_FILE_LINK_PATH, O_PATH);
49   ASSERT_GT(link_fd, 0);
50   ASSERT_ERRNO_SUCCESS();
51   ASSERT_THAT(LIBC_NAMESPACE::close(link_fd), Succeeds(0));
52 
53   ASSERT_THAT(LIBC_NAMESPACE::close(dir_fd), Succeeds(0));
54   ASSERT_THAT(LIBC_NAMESPACE::unlink(TEST_FILE_LINK_PATH), Succeeds(0));
55   ASSERT_THAT(LIBC_NAMESPACE::unlink(TEST_FILE_PATH), Succeeds(0));
56 }
57 
TEST(LlvmLibcSymlinkatTest,SymlinkInNonExistentPath)58 TEST(LlvmLibcSymlinkatTest, SymlinkInNonExistentPath) {
59   using LIBC_NAMESPACE::testing::ErrnoSetterMatcher::Fails;
60   ASSERT_THAT(LIBC_NAMESPACE::symlinkat("non-existent-dir/non-existent-file",
61                                         AT_FDCWD, "non-existent-dir/bad-link"),
62               Fails(ENOENT));
63 }
64