| //===-- Unittests for pread and pwrite ------------------------------------===// |
| // |
| // 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/errno/libc_errno.h" |
| #include "src/fcntl/open.h" |
| #include "src/unistd/close.h" |
| #include "src/unistd/fsync.h" |
| #include "src/unistd/pread.h" |
| #include "src/unistd/pwrite.h" |
| #include "src/unistd/unlink.h" |
| #include "src/unistd/write.h" |
| #include "test/UnitTest/ErrnoSetterMatcher.h" |
| #include "test/UnitTest/Test.h" |
| |
| TEST(LlvmLibcUniStd, PWriteAndPReadBackTest) { |
| // The strategy here is that we first create a file and write to it. Next, |
| // we open that file again and write at an offset. Finally, we open the |
| // file again and pread at an offset and make sure that only expected data |
| // is being read back. This also confirms that pwrite happened successfully. |
| constexpr const char HELLO[] = "hello"; |
| constexpr int HELLO_SIZE = sizeof(HELLO); |
| constexpr off_t OFFSET = 3; |
| constexpr const char OFFSET_TEXT[] = "helhello"; |
| constexpr int OFFSET_TEXT_SIZE = sizeof(OFFSET_TEXT); |
| |
| using __llvm_libc::testing::ErrnoSetterMatcher::Succeeds; |
| |
| constexpr const char *TEST_FILE = "testdata/pread_pwrite.test"; |
| int fd = __llvm_libc::open(TEST_FILE, O_WRONLY | O_CREAT, S_IRWXU); |
| ASSERT_EQ(libc_errno, 0); |
| ASSERT_GT(fd, 0); |
| ASSERT_THAT(__llvm_libc::write(fd, HELLO, HELLO_SIZE), Succeeds(HELLO_SIZE)); |
| ASSERT_THAT(__llvm_libc::fsync(fd), Succeeds(0)); |
| ASSERT_THAT(__llvm_libc::close(fd), Succeeds(0)); |
| |
| fd = __llvm_libc::open(TEST_FILE, O_WRONLY); |
| ASSERT_EQ(libc_errno, 0); |
| ASSERT_GT(fd, 0); |
| ASSERT_THAT(__llvm_libc::pwrite(fd, HELLO, HELLO_SIZE, OFFSET), |
| Succeeds(HELLO_SIZE)); |
| ASSERT_THAT(__llvm_libc::fsync(fd), Succeeds(0)); |
| ASSERT_THAT(__llvm_libc::close(fd), Succeeds(0)); |
| |
| fd = __llvm_libc::open(TEST_FILE, O_RDONLY); |
| ASSERT_EQ(libc_errno, 0); |
| ASSERT_GT(fd, 0); |
| char read_buf[OFFSET_TEXT_SIZE]; |
| ASSERT_THAT(__llvm_libc::pread(fd, read_buf, HELLO_SIZE, OFFSET), |
| Succeeds(HELLO_SIZE)); |
| EXPECT_STREQ(read_buf, HELLO); |
| ASSERT_THAT(__llvm_libc::pread(fd, read_buf, OFFSET_TEXT_SIZE, 0), |
| Succeeds(OFFSET_TEXT_SIZE)); |
| EXPECT_STREQ(read_buf, OFFSET_TEXT); |
| ASSERT_THAT(__llvm_libc::close(fd), Succeeds(0)); |
| |
| ASSERT_THAT(__llvm_libc::unlink(TEST_FILE), Succeeds(0)); |
| } |
| |
| TEST(LlvmLibcUniStd, PWriteFails) { |
| using __llvm_libc::testing::ErrnoSetterMatcher::Fails; |
| EXPECT_THAT(__llvm_libc::pwrite(-1, "", 1, 0), Fails(EBADF)); |
| } |
| |
| TEST(LlvmLibcUniStd, PReadFails) { |
| using __llvm_libc::testing::ErrnoSetterMatcher::Fails; |
| EXPECT_THAT(__llvm_libc::pread(-1, nullptr, 1, 0), Fails(EBADF)); |
| } |