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/unistd/readlink.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 namespace cpp = LIBC_NAMESPACE::cpp;
18
TEST(LlvmLibcReadlinkTest,CreateAndUnlink)19 TEST(LlvmLibcReadlinkTest, CreateAndUnlink) {
20 using LIBC_NAMESPACE::testing::ErrnoSetterMatcher::Succeeds;
21 constexpr const char *FILENAME = "readlink_test_value";
22 auto LINK_VAL = libc_make_test_file_path(FILENAME);
23 constexpr const char *FILENAME2 = "readlink.test.link";
24 auto LINK = libc_make_test_file_path(FILENAME2);
25 LIBC_NAMESPACE::libc_errno = 0;
26
27 // The test strategy is as follows:
28 // 1. Create a symlink with value LINK_VAL.
29 // 2. Read the symlink with readlink. The link value read should be LINK_VAL
30 // 3. Cleanup the symlink created in step #1.
31 ASSERT_THAT(LIBC_NAMESPACE::symlink(LINK_VAL, LINK), Succeeds(0));
32
33 char buf[sizeof(LINK_VAL)];
34 ssize_t len = LIBC_NAMESPACE::readlink(LINK, buf, sizeof(buf));
35 ASSERT_ERRNO_SUCCESS();
36 ASSERT_EQ(cpp::string_view(buf, len), cpp::string_view(LINK_VAL));
37
38 ASSERT_THAT(LIBC_NAMESPACE::unlink(LINK), Succeeds(0));
39 }
40
TEST(LlvmLibcReadlinkTest,ReadlinkInNonExistentPath)41 TEST(LlvmLibcReadlinkTest, ReadlinkInNonExistentPath) {
42 using LIBC_NAMESPACE::testing::ErrnoSetterMatcher::Fails;
43 char buf[8];
44 ASSERT_THAT(LIBC_NAMESPACE::readlink("non-existent-link", buf, sizeof(buf)),
45 Fails(ENOENT));
46 }
47