1 //===-- Unittests for readlinkat ------------------------------------------===//
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/__support/CPP/string_view.h"
10 #include "src/errno/libc_errno.h"
11 #include "src/string/string_utils.h"
12 #include "src/unistd/readlinkat.h"
13 #include "src/unistd/symlink.h"
14 #include "src/unistd/unlink.h"
15 #include "test/UnitTest/ErrnoSetterMatcher.h"
16 #include "test/UnitTest/Test.h"
17
18 #include "hdr/fcntl_macros.h"
19
20 namespace cpp = LIBC_NAMESPACE::cpp;
21
TEST(LlvmLibcReadlinkatTest,CreateAndUnlink)22 TEST(LlvmLibcReadlinkatTest, CreateAndUnlink) {
23 using LIBC_NAMESPACE::testing::ErrnoSetterMatcher::Succeeds;
24 constexpr const char *FILENAME = "readlinkat_test_file";
25 auto LINK_VAL = libc_make_test_file_path(FILENAME);
26 constexpr const char *FILENAME2 = "readlinkat_test_file.link";
27 auto LINK = libc_make_test_file_path(FILENAME2);
28 LIBC_NAMESPACE::libc_errno = 0;
29
30 // The test strategy is as follows:
31 // 1. Create a symlink with value LINK_VAL.
32 // 2. Read the symlink with readlink. The link value read should be LINK_VAL
33 // 3. Cleanup the symlink created in step #1.
34 ASSERT_THAT(LIBC_NAMESPACE::symlink(LINK_VAL, LINK), Succeeds(0));
35
36 char buf[256];
37 ssize_t len = LIBC_NAMESPACE::readlinkat(
38 AT_FDCWD, LINK, buf, LIBC_NAMESPACE::internal::string_length(FILENAME));
39 ASSERT_ERRNO_SUCCESS();
40 ASSERT_EQ(cpp::string_view(buf, len), cpp::string_view(LINK_VAL));
41
42 ASSERT_THAT(LIBC_NAMESPACE::unlink(LINK), Succeeds(0));
43 }
44
TEST(LlvmLibcReadlinkatTest,ReadlinkInNonExistentPath)45 TEST(LlvmLibcReadlinkatTest, ReadlinkInNonExistentPath) {
46 using LIBC_NAMESPACE::testing::ErrnoSetterMatcher::Fails;
47 constexpr auto LEN = 8;
48 char buf[LEN];
49 ASSERT_THAT(
50 LIBC_NAMESPACE::readlinkat(AT_FDCWD, "non-existent-link", buf, LEN),
51 Fails(ENOENT));
52 }
53