75 lines
2.8 KiB
C++
75 lines
2.8 KiB
C++
//===-- Unittests for pread and pwrite ------------------------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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#include "src/fcntl/open.h"
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#include "src/unistd/close.h"
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#include "src/unistd/fsync.h"
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#include "src/unistd/pread.h"
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#include "src/unistd/pwrite.h"
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#include "src/unistd/unlink.h"
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#include "src/unistd/write.h"
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#include "test/ErrnoSetterMatcher.h"
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#include "utils/UnitTest/Test.h"
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#include "utils/testutils/FDReader.h"
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#include <errno.h>
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TEST(LlvmLibcUniStd, PWriteAndPReadBackTest) {
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// The strategy here is that we first create a file and write to it. Next,
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// we open that file again and write at an offset. Finally, we open the
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// file again and pread at an offset and make sure that only expected data
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// is being read back. This also confirms that pwrite happened successfully.
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constexpr const char HELLO[] = "hello";
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constexpr int HELLO_SIZE = sizeof(HELLO);
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constexpr off_t OFFSET = 3;
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constexpr const char OFFSET_TEXT[] = "helhello";
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constexpr int OFFSET_TEXT_SIZE = sizeof(OFFSET_TEXT);
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using __llvm_libc::testing::ErrnoSetterMatcher::Succeeds;
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constexpr const char *TEST_FILE = "testdata/pread_pwrite.test";
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int fd = __llvm_libc::open(TEST_FILE, O_WRONLY | O_CREAT, S_IRWXU);
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ASSERT_EQ(errno, 0);
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ASSERT_GT(fd, 0);
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ASSERT_THAT(__llvm_libc::write(fd, HELLO, HELLO_SIZE), Succeeds(HELLO_SIZE));
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ASSERT_THAT(__llvm_libc::fsync(fd), Succeeds(0));
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ASSERT_THAT(__llvm_libc::close(fd), Succeeds(0));
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fd = __llvm_libc::open(TEST_FILE, O_WRONLY);
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ASSERT_EQ(errno, 0);
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ASSERT_GT(fd, 0);
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ASSERT_THAT(__llvm_libc::pwrite(fd, HELLO, HELLO_SIZE, OFFSET),
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Succeeds(HELLO_SIZE));
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ASSERT_THAT(__llvm_libc::fsync(fd), Succeeds(0));
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ASSERT_THAT(__llvm_libc::close(fd), Succeeds(0));
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fd = __llvm_libc::open(TEST_FILE, O_RDONLY);
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ASSERT_EQ(errno, 0);
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ASSERT_GT(fd, 0);
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char read_buf[OFFSET_TEXT_SIZE];
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ASSERT_THAT(__llvm_libc::pread(fd, read_buf, HELLO_SIZE, OFFSET),
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Succeeds(HELLO_SIZE));
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EXPECT_STREQ(read_buf, HELLO);
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ASSERT_THAT(__llvm_libc::pread(fd, read_buf, OFFSET_TEXT_SIZE, 0),
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Succeeds(OFFSET_TEXT_SIZE));
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EXPECT_STREQ(read_buf, OFFSET_TEXT);
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ASSERT_THAT(__llvm_libc::close(fd), Succeeds(0));
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ASSERT_THAT(__llvm_libc::unlink(TEST_FILE), Succeeds(0));
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}
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TEST(LlvmLibcUniStd, PWriteFails) {
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using __llvm_libc::testing::ErrnoSetterMatcher::Fails;
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EXPECT_THAT(__llvm_libc::pwrite(-1, "", 1, 0), Fails(EBADF));
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}
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TEST(LlvmLibcUniStd, PReadFails) {
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using __llvm_libc::testing::ErrnoSetterMatcher::Fails;
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EXPECT_THAT(__llvm_libc::pread(-1, nullptr, 1, 0), Fails(EBADF));
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}
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