| 1 | //===-- Unittests for readlinkat ------------------------------------------===// |
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| 2 | // |
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| 3 | // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
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| 4 | // See https://llvm.org/LICENSE.txt for license information. |
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| 5 | // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
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| 6 | // |
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| 7 | //===----------------------------------------------------------------------===// |
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| 8 | |
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| 9 | #include "src/__support/CPP/string_view.h" |
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| 10 | #include "src/errno/libc_errno.h" |
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| 11 | #include "src/unistd/readlinkat.h" |
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| 12 | #include "src/unistd/symlink.h" |
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| 13 | #include "src/unistd/unlink.h" |
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| 14 | #include "test/UnitTest/ErrnoSetterMatcher.h" |
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| 15 | #include "test/UnitTest/Test.h" |
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| 16 | |
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| 17 | #include <fcntl.h> |
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| 18 | |
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| 19 | namespace cpp = LIBC_NAMESPACE::cpp; |
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| 20 | |
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| 21 | TEST(LlvmLibcReadlinkatTest, CreateAndUnlink) { |
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| 22 | using LIBC_NAMESPACE::testing::ErrnoSetterMatcher::Succeeds; |
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| 23 | constexpr const char *FILENAME = "readlinkat_test_value" ; |
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| 24 | auto LINK_VAL = libc_make_test_file_path(FILENAME); |
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| 25 | constexpr const char *FILENAME2 = "readlinkat.test.link" ; |
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| 26 | auto LINK = libc_make_test_file_path(FILENAME2); |
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| 27 | LIBC_NAMESPACE::libc_errno = 0; |
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| 28 | |
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| 29 | // The test strategy is as follows: |
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| 30 | // 1. Create a symlink with value LINK_VAL. |
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| 31 | // 2. Read the symlink with readlink. The link value read should be LINK_VAL |
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| 32 | // 3. Cleanup the symlink created in step #1. |
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| 33 | ASSERT_THAT(LIBC_NAMESPACE::symlink(LINK_VAL, LINK), Succeeds(0)); |
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| 34 | |
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| 35 | char buf[sizeof(LINK_VAL)]; |
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| 36 | ssize_t len = LIBC_NAMESPACE::readlinkat(AT_FDCWD, LINK, buf, sizeof(buf)); |
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| 37 | ASSERT_ERRNO_SUCCESS(); |
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| 38 | ASSERT_EQ(cpp::string_view(buf, len), cpp::string_view(LINK_VAL)); |
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| 39 | |
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| 40 | ASSERT_THAT(LIBC_NAMESPACE::unlink(LINK), Succeeds(0)); |
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| 41 | } |
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| 42 | |
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| 43 | TEST(LlvmLibcReadlinkatTest, ReadlinkInNonExistentPath) { |
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| 44 | using LIBC_NAMESPACE::testing::ErrnoSetterMatcher::Fails; |
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| 45 | char buf[8]; |
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| 46 | ASSERT_THAT(LIBC_NAMESPACE::readlinkat(AT_FDCWD, "non-existent-link" , buf, |
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| 47 | sizeof(buf)), |
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| 48 | Fails(ENOENT)); |
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| 49 | } |
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| 50 | |
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