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-rw-r--r--test/syscalls/linux/preadv2.cc280
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diff --git a/test/syscalls/linux/preadv2.cc b/test/syscalls/linux/preadv2.cc
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+// 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
+#elif defined(__aarch64__)
+#define SYS_preadv2 286
+#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
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