1 //===-- Unittests for readlink --------------------------------------------===//
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/readlink.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 namespace cpp = LIBC_NAMESPACE::cpp;
19
TEST(LlvmLibcReadlinkTest,CreateAndUnlink)20 TEST(LlvmLibcReadlinkTest, CreateAndUnlink) {
21 using LIBC_NAMESPACE::testing::ErrnoSetterMatcher::Succeeds;
22 constexpr const char *FILENAME = "readlink_test_file";
23 auto LINK_VAL = libc_make_test_file_path(FILENAME);
24 constexpr const char *FILENAME2 = "readlink_test_file.link";
25 auto LINK = libc_make_test_file_path(FILENAME2);
26 LIBC_NAMESPACE::libc_errno = 0;
27
28 // The test strategy is as follows:
29 // 1. Create a symlink with value LINK_VAL.
30 // 2. Read the symlink with readlink. The link value read should be LINK_VAL
31 // 3. Cleanup the symlink created in step #1.
32 ASSERT_THAT(LIBC_NAMESPACE::symlink(LINK_VAL, LINK), Succeeds(0));
33
34 char buf[256];
35 ssize_t len = LIBC_NAMESPACE::readlink(
36 LINK, buf, LIBC_NAMESPACE::internal::string_length(FILENAME));
37 ASSERT_ERRNO_SUCCESS();
38 ASSERT_EQ(cpp::string_view(buf, len), cpp::string_view(LINK_VAL));
39
40 ASSERT_THAT(LIBC_NAMESPACE::unlink(LINK), Succeeds(0));
41 }
42
TEST(LlvmLibcReadlinkTest,ReadlinkInNonExistentPath)43 TEST(LlvmLibcReadlinkTest, ReadlinkInNonExistentPath) {
44 using LIBC_NAMESPACE::testing::ErrnoSetterMatcher::Fails;
45 constexpr auto LEN = 8;
46 char buf[LEN];
47 ASSERT_THAT(LIBC_NAMESPACE::readlink("non-existent-link", buf, LEN),
48 Fails(ENOENT));
49 }
50