281 lines
9.1 KiB
C++
281 lines
9.1 KiB
C++
// Copyright 2018 The gVisor Authors.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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#include <fcntl.h>
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#include <sys/syscall.h>
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#include <sys/types.h>
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#include <sys/uio.h>
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#include <string>
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#include <vector>
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#include "gtest/gtest.h"
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#include "absl/memory/memory.h"
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#include "test/syscalls/linux/file_base.h"
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#include "test/util/file_descriptor.h"
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#include "test/util/temp_path.h"
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#include "test/util/test_util.h"
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namespace gvisor {
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namespace testing {
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namespace {
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#ifndef SYS_preadv2
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#if defined(__x86_64__)
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#define SYS_preadv2 327
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#elif defined(__aarch64__)
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#define SYS_preadv2 286
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#else
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#error "Unknown architecture"
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#endif
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#endif // SYS_preadv2
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#ifndef RWF_HIPRI
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#define RWF_HIPRI 0x1
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#endif // RWF_HIPRI
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constexpr int kBufSize = 1024;
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std::string SetContent() {
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std::string content;
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for (int i = 0; i < kBufSize; i++) {
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content += static_cast<char>((i % 10) + '0');
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}
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return content;
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}
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ssize_t preadv2(unsigned long fd, const struct iovec* iov, unsigned long iovcnt,
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off_t offset, unsigned long flags) {
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// syscall on preadv2 does some weird things (see man syscall and search
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// preadv2), so we insert a 0 to word align the flags argument on native.
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return syscall(SYS_preadv2, fd, iov, iovcnt, offset, 0, flags);
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}
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// This test is the base case where we call preadv (no offset, no flags).
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TEST(Preadv2Test, TestBaseCall) {
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SKIP_IF(preadv2(-1, nullptr, 0, 0, 0) < 0 && errno == ENOSYS);
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std::string content = SetContent();
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const TempPath file = ASSERT_NO_ERRNO_AND_VALUE(TempPath::CreateFileWith(
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GetAbsoluteTestTmpdir(), content, TempPath::kDefaultFileMode));
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const FileDescriptor fd =
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ASSERT_NO_ERRNO_AND_VALUE(Open(file.path(), O_RDONLY));
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std::vector<char> buf(kBufSize);
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struct iovec iov[2];
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iov[0].iov_base = buf.data();
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iov[0].iov_len = buf.size() / 2;
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iov[1].iov_base = static_cast<char*>(iov[0].iov_base) + (content.size() / 2);
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iov[1].iov_len = content.size() / 2;
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EXPECT_THAT(preadv2(fd.get(), iov, /*iovcnt*/ 2, /*offset=*/0, /*flags=*/0),
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SyscallSucceedsWithValue(kBufSize));
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EXPECT_EQ(content, std::string(buf.data(), buf.size()));
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}
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// This test is where we call preadv with an offset and no flags.
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TEST(Preadv2Test, TestValidPositiveOffset) {
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SKIP_IF(preadv2(-1, nullptr, 0, 0, 0) < 0 && errno == ENOSYS);
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std::string content = SetContent();
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const std::string prefix = "0";
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const TempPath file = ASSERT_NO_ERRNO_AND_VALUE(TempPath::CreateFileWith(
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GetAbsoluteTestTmpdir(), prefix + content, TempPath::kDefaultFileMode));
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const FileDescriptor fd =
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ASSERT_NO_ERRNO_AND_VALUE(Open(file.path(), O_RDONLY));
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std::vector<char> buf(kBufSize, '0');
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struct iovec iov;
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iov.iov_base = buf.data();
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iov.iov_len = buf.size();
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EXPECT_THAT(preadv2(fd.get(), &iov, /*iovcnt=*/1, /*offset=*/prefix.size(),
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/*flags=*/0),
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SyscallSucceedsWithValue(kBufSize));
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EXPECT_THAT(lseek(fd.get(), 0, SEEK_CUR), SyscallSucceedsWithValue(0));
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EXPECT_EQ(content, std::string(buf.data(), buf.size()));
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}
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// This test is the base case where we call readv by using -1 as the offset. The
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// read should use the file offset, so the test increments it by one prior to
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// calling preadv2.
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TEST(Preadv2Test, TestNegativeOneOffset) {
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SKIP_IF(preadv2(-1, nullptr, 0, 0, 0) < 0 && errno == ENOSYS);
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std::string content = SetContent();
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const std::string prefix = "231";
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const TempPath file = ASSERT_NO_ERRNO_AND_VALUE(TempPath::CreateFileWith(
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GetAbsoluteTestTmpdir(), prefix + content, TempPath::kDefaultFileMode));
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const FileDescriptor fd =
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ASSERT_NO_ERRNO_AND_VALUE(Open(file.path(), O_RDONLY));
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ASSERT_THAT(lseek(fd.get(), prefix.size(), SEEK_SET),
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SyscallSucceedsWithValue(prefix.size()));
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std::vector<char> buf(kBufSize, '0');
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struct iovec iov;
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iov.iov_base = buf.data();
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iov.iov_len = buf.size();
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EXPECT_THAT(preadv2(fd.get(), &iov, /*iovcnt=*/1, /*offset=*/-1, /*flags=*/0),
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SyscallSucceedsWithValue(kBufSize));
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EXPECT_THAT(lseek(fd.get(), 0, SEEK_CUR),
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SyscallSucceedsWithValue(prefix.size() + buf.size()));
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EXPECT_EQ(content, std::string(buf.data(), buf.size()));
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}
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// preadv2 requires if the RWF_HIPRI flag is passed, the fd must be opened with
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// O_DIRECT. This test implements a correct call with the RWF_HIPRI flag.
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TEST(Preadv2Test, TestCallWithRWF_HIPRI) {
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SKIP_IF(preadv2(-1, nullptr, 0, 0, 0) < 0 && errno == ENOSYS);
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std::string content = SetContent();
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const TempPath file = ASSERT_NO_ERRNO_AND_VALUE(TempPath::CreateFileWith(
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GetAbsoluteTestTmpdir(), content, TempPath::kDefaultFileMode));
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const FileDescriptor fd =
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ASSERT_NO_ERRNO_AND_VALUE(Open(file.path(), O_RDONLY));
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EXPECT_THAT(fsync(fd.get()), SyscallSucceeds());
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std::vector<char> buf(kBufSize, '0');
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struct iovec iov;
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iov.iov_base = buf.data();
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iov.iov_len = buf.size();
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EXPECT_THAT(
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preadv2(fd.get(), &iov, /*iovcnt=*/1, /*offset=*/0, /*flags=*/RWF_HIPRI),
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SyscallSucceedsWithValue(kBufSize));
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EXPECT_THAT(lseek(fd.get(), 0, SEEK_CUR), SyscallSucceedsWithValue(0));
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EXPECT_EQ(content, std::string(buf.data(), buf.size()));
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}
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// This test calls preadv2 with an invalid flag.
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TEST(Preadv2Test, TestInvalidFlag) {
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SKIP_IF(preadv2(-1, nullptr, 0, 0, 0) < 0 && errno == ENOSYS);
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const TempPath file = ASSERT_NO_ERRNO_AND_VALUE(TempPath::CreateFileWith(
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GetAbsoluteTestTmpdir(), "", TempPath::kDefaultFileMode));
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const FileDescriptor fd =
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ASSERT_NO_ERRNO_AND_VALUE(Open(file.path(), O_RDONLY | O_DIRECT));
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std::vector<char> buf(kBufSize, '0');
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struct iovec iov;
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iov.iov_base = buf.data();
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iov.iov_len = buf.size();
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EXPECT_THAT(preadv2(fd.get(), &iov, /*iovcnt=*/1,
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/*offset=*/0, /*flags=*/0xF0),
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SyscallFailsWithErrno(EOPNOTSUPP));
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}
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// This test calls preadv2 with an invalid offset.
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TEST(Preadv2Test, TestInvalidOffset) {
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SKIP_IF(preadv2(-1, nullptr, 0, 0, 0) < 0 && errno == ENOSYS);
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const TempPath file = ASSERT_NO_ERRNO_AND_VALUE(TempPath::CreateFileWith(
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GetAbsoluteTestTmpdir(), "", TempPath::kDefaultFileMode));
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const FileDescriptor fd =
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ASSERT_NO_ERRNO_AND_VALUE(Open(file.path(), O_RDONLY | O_DIRECT));
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auto iov = absl::make_unique<struct iovec[]>(1);
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iov[0].iov_base = nullptr;
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iov[0].iov_len = 0;
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EXPECT_THAT(preadv2(fd.get(), iov.get(), /*iovcnt=*/1, /*offset=*/-8,
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/*flags=*/0),
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SyscallFailsWithErrno(EINVAL));
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}
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// This test calls preadv with a file set O_WRONLY.
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TEST(Preadv2Test, TestUnreadableFile) {
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SKIP_IF(preadv2(-1, nullptr, 0, 0, 0) < 0 && errno == ENOSYS);
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const TempPath file = ASSERT_NO_ERRNO_AND_VALUE(TempPath::CreateFileWith(
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GetAbsoluteTestTmpdir(), "", TempPath::kDefaultFileMode));
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const FileDescriptor fd =
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ASSERT_NO_ERRNO_AND_VALUE(Open(file.path(), O_WRONLY));
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auto iov = absl::make_unique<struct iovec[]>(1);
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iov[0].iov_base = nullptr;
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iov[0].iov_len = 0;
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EXPECT_THAT(preadv2(fd.get(), iov.get(), /*iovcnt=*/1,
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/*offset=*/0, /*flags=*/0),
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SyscallFailsWithErrno(EBADF));
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}
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// Calling preadv2 with a non-negative offset calls preadv. Calling preadv with
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// an unseekable file is not allowed. A pipe is used for an unseekable file.
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TEST(Preadv2Test, TestUnseekableFileInvalid) {
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SKIP_IF(preadv2(-1, nullptr, 0, 0, 0) < 0 && errno == ENOSYS);
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int pipe_fds[2];
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ASSERT_THAT(pipe(pipe_fds), SyscallSucceeds());
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auto iov = absl::make_unique<struct iovec[]>(1);
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iov[0].iov_base = nullptr;
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iov[0].iov_len = 0;
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EXPECT_THAT(preadv2(pipe_fds[0], iov.get(), /*iovcnt=*/1,
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/*offset=*/2, /*flags=*/0),
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SyscallFailsWithErrno(ESPIPE));
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EXPECT_THAT(close(pipe_fds[0]), SyscallSucceeds());
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EXPECT_THAT(close(pipe_fds[1]), SyscallSucceeds());
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}
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TEST(Preadv2Test, TestUnseekableFileValid) {
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SKIP_IF(preadv2(-1, nullptr, 0, 0, 0) < 0 && errno == ENOSYS);
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int pipe_fds[2];
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ASSERT_THAT(pipe(pipe_fds), SyscallSucceeds());
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std::vector<char> content(32, 'X');
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EXPECT_THAT(write(pipe_fds[1], content.data(), content.size()),
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SyscallSucceedsWithValue(content.size()));
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std::vector<char> buf(content.size());
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auto iov = absl::make_unique<struct iovec[]>(1);
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iov[0].iov_base = buf.data();
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iov[0].iov_len = buf.size();
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EXPECT_THAT(preadv2(pipe_fds[0], iov.get(), /*iovcnt=*/1,
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/*offset=*/static_cast<off_t>(-1), /*flags=*/0),
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SyscallSucceedsWithValue(buf.size()));
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EXPECT_EQ(content, buf);
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EXPECT_THAT(close(pipe_fds[0]), SyscallSucceeds());
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EXPECT_THAT(close(pipe_fds[1]), SyscallSucceeds());
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}
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} // namespace
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} // namespace testing
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} // namespace gvisor
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