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