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 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 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