| //===-- Unittests for truncate --------------------------------------------===// |
| // |
| // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
| // See https://llvm.org/LICENSE.txt for license information. |
| // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
| // |
| //===----------------------------------------------------------------------===// |
| |
| #include "src/__support/CPP/string_view.h" |
| #include "src/errno/libc_errno.h" |
| #include "src/fcntl/open.h" |
| #include "src/unistd/close.h" |
| #include "src/unistd/read.h" |
| #include "src/unistd/truncate.h" |
| #include "src/unistd/unlink.h" |
| #include "src/unistd/write.h" |
| #include "test/UnitTest/ErrnoSetterMatcher.h" |
| #include "test/UnitTest/Test.h" |
| |
| #include <sys/stat.h> |
| |
| namespace cpp = LIBC_NAMESPACE::cpp; |
| |
| TEST(LlvmLibcTruncateTest, CreateAndTruncate) { |
| using LIBC_NAMESPACE::testing::ErrnoSetterMatcher::Succeeds; |
| constexpr const char *FILENAME = "truncate.test"; |
| auto TEST_FILE = libc_make_test_file_path(FILENAME); |
| constexpr const char WRITE_DATA[] = "hello, truncate"; |
| constexpr size_t WRITE_SIZE = sizeof(WRITE_DATA); |
| char buf[WRITE_SIZE]; |
| |
| // The test strategy is as follows: |
| // 1. Create a normal file with some data in it. |
| // 2. Read it to make sure what was written is actually in the file. |
| // 3. Truncate to 1 byte. |
| // 4. Try to read more than 1 byte and fail. |
| LIBC_NAMESPACE::libc_errno = 0; |
| int fd = LIBC_NAMESPACE::open(TEST_FILE, O_WRONLY | O_CREAT, S_IRWXU); |
| ASSERT_ERRNO_SUCCESS(); |
| ASSERT_GT(fd, 0); |
| ASSERT_EQ(ssize_t(WRITE_SIZE), |
| LIBC_NAMESPACE::write(fd, WRITE_DATA, WRITE_SIZE)); |
| ASSERT_THAT(LIBC_NAMESPACE::close(fd), Succeeds(0)); |
| |
| fd = LIBC_NAMESPACE::open(TEST_FILE, O_RDONLY); |
| ASSERT_ERRNO_SUCCESS(); |
| ASSERT_GT(fd, 0); |
| ASSERT_EQ(ssize_t(WRITE_SIZE), LIBC_NAMESPACE::read(fd, buf, WRITE_SIZE)); |
| ASSERT_EQ(cpp::string_view(buf), cpp::string_view(WRITE_DATA)); |
| ASSERT_THAT(LIBC_NAMESPACE::close(fd), Succeeds(0)); |
| |
| ASSERT_THAT(LIBC_NAMESPACE::truncate(TEST_FILE, off_t(1)), Succeeds(0)); |
| |
| fd = LIBC_NAMESPACE::open(TEST_FILE, O_RDONLY); |
| ASSERT_ERRNO_SUCCESS(); |
| ASSERT_GT(fd, 0); |
| ASSERT_EQ(ssize_t(1), LIBC_NAMESPACE::read(fd, buf, WRITE_SIZE)); |
| ASSERT_EQ(buf[0], WRITE_DATA[0]); |
| ASSERT_THAT(LIBC_NAMESPACE::close(fd), Succeeds(0)); |
| |
| ASSERT_THAT(LIBC_NAMESPACE::unlink(TEST_FILE), Succeeds(0)); |
| } |
| |
| TEST(LlvmLibcTruncateTest, TruncateNonExistentFile) { |
| using LIBC_NAMESPACE::testing::ErrnoSetterMatcher::Fails; |
| ASSERT_THAT( |
| LIBC_NAMESPACE::truncate("non-existent-dir/non-existent-file", off_t(1)), |
| Fails(ENOENT)); |
| } |