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-rw-r--r--test/syscalls/linux/pwritev2.cc307
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diff --git a/test/syscalls/linux/pwritev2.cc b/test/syscalls/linux/pwritev2.cc
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+++ b/test/syscalls/linux/pwritev2.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 "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_pwritev2
+#if defined(__x86_64__)
+#define SYS_pwritev2 328
+#elif defined(__aarch64__)
+#define SYS_pwritev2 287
+#else
+#error "Unknown architecture"
+#endif
+#endif // SYS_pwrite2
+
+#ifndef RWF_HIPRI
+#define RWF_HIPRI 0x1
+#endif // RWF_HIPRI
+
+#ifndef RWF_DSYNC
+#define RWF_DSYNC 0x2
+#endif // RWF_DSYNC
+
+#ifndef RWF_SYNC
+#define RWF_SYNC 0x4
+#endif // RWF_SYNC
+
+constexpr int kBufSize = 1024;
+
+void SetContent(std::vector<char>& content) {
+ for (uint i = 0; i < content.size(); i++) {
+ content[i] = static_cast<char>((i % 10) + '0');
+ }
+}
+
+ssize_t pwritev2(unsigned long fd, const struct iovec* iov,
+ unsigned long iovcnt, off_t offset, unsigned long flags) {
+ // syscall on pwritev2 does some weird things (see man syscall and search
+ // pwritev2), so we insert a 0 to word align the flags argument on native.
+ return syscall(SYS_pwritev2, fd, iov, iovcnt, offset, 0, flags);
+}
+
+// This test is the base case where we call pwritev (no offset, no flags).
+TEST(Writev2Test, BaseCall) {
+ SKIP_IF(pwritev2(-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_RDWR));
+
+ std::vector<char> content(kBufSize);
+ SetContent(content);
+ struct iovec iov[2];
+ iov[0].iov_base = content.data();
+ iov[0].iov_len = content.size() / 2;
+ iov[1].iov_base = static_cast<char*>(iov[0].iov_base) + (content.size() / 2);
+ iov[1].iov_len = content.size() / 2;
+
+ ASSERT_THAT(pwritev2(fd.get(), iov, /*iovcnt=*/2,
+ /*offset=*/0, /*flags=*/0),
+ SyscallSucceedsWithValue(kBufSize));
+
+ std::vector<char> buf(kBufSize);
+ EXPECT_THAT(read(fd.get(), buf.data(), kBufSize),
+ SyscallSucceedsWithValue(kBufSize));
+
+ EXPECT_EQ(content, buf);
+}
+
+// This test is where we call pwritev2 with a positive offset and no flags.
+TEST(Pwritev2Test, ValidPositiveOffset) {
+ SKIP_IF(pwritev2(-1, nullptr, 0, 0, 0) < 0 && errno == ENOSYS);
+
+ std::string prefix(kBufSize, '0');
+
+ const TempPath file = ASSERT_NO_ERRNO_AND_VALUE(TempPath::CreateFileWith(
+ GetAbsoluteTestTmpdir(), prefix, TempPath::kDefaultFileMode));
+ const FileDescriptor fd =
+ ASSERT_NO_ERRNO_AND_VALUE(Open(file.path(), O_RDWR));
+
+ std::vector<char> content(kBufSize);
+ SetContent(content);
+ struct iovec iov;
+ iov.iov_base = content.data();
+ iov.iov_len = content.size();
+
+ ASSERT_THAT(pwritev2(fd.get(), &iov, /*iovcnt=*/1,
+ /*offset=*/prefix.size(), /*flags=*/0),
+ SyscallSucceedsWithValue(content.size()));
+
+ std::vector<char> buf(prefix.size() + content.size());
+ EXPECT_THAT(read(fd.get(), buf.data(), buf.size()),
+ SyscallSucceedsWithValue(buf.size()));
+
+ std::vector<char> want(prefix.begin(), prefix.end());
+ want.insert(want.end(), content.begin(), content.end());
+ EXPECT_EQ(want, buf);
+}
+
+// This test is the base case where we call writev by using -1 as the offset.
+// The write should use the file offset, so the test increments the file offset
+// prior to call pwritev2.
+TEST(Pwritev2Test, NegativeOneOffset) {
+ SKIP_IF(pwritev2(-1, nullptr, 0, 0, 0) < 0 && errno == ENOSYS);
+
+ const std::string prefix = "00";
+ const TempPath file = ASSERT_NO_ERRNO_AND_VALUE(TempPath::CreateFileWith(
+ GetAbsoluteTestTmpdir(), prefix.data(), TempPath::kDefaultFileMode));
+ const FileDescriptor fd =
+ ASSERT_NO_ERRNO_AND_VALUE(Open(file.path(), O_RDWR));
+ ASSERT_THAT(lseek(fd.get(), prefix.size(), SEEK_SET),
+ SyscallSucceedsWithValue(prefix.size()));
+
+ std::vector<char> content(kBufSize);
+ SetContent(content);
+ struct iovec iov;
+ iov.iov_base = content.data();
+ iov.iov_len = content.size();
+
+ ASSERT_THAT(pwritev2(fd.get(), &iov, /*iovcnt*/ 1,
+ /*offset=*/static_cast<off_t>(-1), /*flags=*/0),
+ SyscallSucceedsWithValue(content.size()));
+
+ ASSERT_THAT(lseek(fd.get(), 0, SEEK_CUR),
+ SyscallSucceedsWithValue(prefix.size() + content.size()));
+
+ std::vector<char> buf(prefix.size() + content.size());
+ EXPECT_THAT(pread(fd.get(), buf.data(), buf.size(), /*offset=*/0),
+ SyscallSucceedsWithValue(buf.size()));
+
+ std::vector<char> want(prefix.begin(), prefix.end());
+ want.insert(want.end(), content.begin(), content.end());
+ EXPECT_EQ(want, buf);
+}
+
+// pwritev2 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(Pwritev2Test, CallWithRWF_HIPRI) {
+ SKIP_IF(pwritev2(-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_RDWR));
+
+ std::vector<char> content(kBufSize);
+ SetContent(content);
+ struct iovec iov;
+ iov.iov_base = content.data();
+ iov.iov_len = content.size();
+
+ EXPECT_THAT(pwritev2(fd.get(), &iov, /*iovcnt=*/1,
+ /*offset=*/0, /*flags=*/RWF_HIPRI),
+ SyscallSucceedsWithValue(kBufSize));
+
+ std::vector<char> buf(content.size());
+ EXPECT_THAT(read(fd.get(), buf.data(), buf.size()),
+ SyscallSucceedsWithValue(buf.size()));
+
+ EXPECT_EQ(buf, content);
+}
+
+// This test calls pwritev2 with a bad file descriptor.
+TEST(Writev2Test, BadFile) {
+ SKIP_IF(pwritev2(-1, nullptr, 0, 0, 0) < 0 && errno == ENOSYS);
+ ASSERT_THAT(pwritev2(/*fd=*/-1, /*iov=*/nullptr, /*iovcnt=*/0,
+ /*offset=*/0, /*flags=*/0),
+ SyscallFailsWithErrno(EBADF));
+}
+
+// This test calls pwrite2 with an invalid offset.
+TEST(Pwritev2Test, InvalidOffset) {
+ SKIP_IF(pwritev2(-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_RDWR));
+
+ char buf[16];
+ struct iovec iov;
+ iov.iov_base = buf;
+ iov.iov_len = sizeof(buf);
+
+ EXPECT_THAT(pwritev2(fd.get(), &iov, /*iovcnt=*/1,
+ /*offset=*/static_cast<off_t>(-8), /*flags=*/0),
+ SyscallFailsWithErrno(EINVAL));
+}
+
+TEST(Pwritev2Test, UnseekableFileValid) {
+ SKIP_IF(pwritev2(-1, nullptr, 0, 0, 0) < 0 && errno == ENOSYS);
+
+ int pipe_fds[2];
+
+ ASSERT_THAT(pipe(pipe_fds), SyscallSucceeds());
+
+ std::vector<char> content(32, '0');
+ SetContent(content);
+ struct iovec iov;
+ iov.iov_base = content.data();
+ iov.iov_len = content.size();
+
+ EXPECT_THAT(pwritev2(pipe_fds[1], &iov, /*iovcnt=*/1,
+ /*offset=*/static_cast<off_t>(-1), /*flags=*/0),
+ SyscallSucceedsWithValue(content.size()));
+
+ std::vector<char> buf(content.size());
+ EXPECT_THAT(read(pipe_fds[0], buf.data(), buf.size()),
+ SyscallSucceedsWithValue(buf.size()));
+
+ EXPECT_EQ(content, buf);
+
+ EXPECT_THAT(close(pipe_fds[0]), SyscallSucceeds());
+ EXPECT_THAT(close(pipe_fds[1]), SyscallSucceeds());
+}
+
+// Calling pwritev2 with a non-negative offset calls pwritev. Calling pwritev
+// with an unseekable file is not allowed. A pipe is used for an unseekable
+// file.
+TEST(Pwritev2Test, UnseekableFileInvalid) {
+ SKIP_IF(pwritev2(-1, nullptr, 0, 0, 0) < 0 && errno == ENOSYS);
+
+ int pipe_fds[2];
+ char buf[16];
+ struct iovec iov;
+ iov.iov_base = buf;
+ iov.iov_len = sizeof(buf);
+
+ ASSERT_THAT(pipe(pipe_fds), SyscallSucceeds());
+
+ EXPECT_THAT(pwritev2(pipe_fds[1], &iov, /*iovcnt=*/1,
+ /*offset=*/2, /*flags=*/0),
+ SyscallFailsWithErrno(ESPIPE));
+
+ EXPECT_THAT(close(pipe_fds[0]), SyscallSucceeds());
+ EXPECT_THAT(close(pipe_fds[1]), SyscallSucceeds());
+}
+
+TEST(Pwritev2Test, ReadOnlyFile) {
+ SKIP_IF(pwritev2(-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));
+
+ char buf[16];
+ struct iovec iov;
+ iov.iov_base = buf;
+ iov.iov_len = sizeof(buf);
+
+ EXPECT_THAT(pwritev2(fd.get(), &iov, /*iovcnt=*/1,
+ /*offset=*/0, /*flags=*/0),
+ SyscallFailsWithErrno(EBADF));
+}
+
+// This test calls pwritev2 with an invalid flag.
+TEST(Pwritev2Test, InvalidFlag) {
+ SKIP_IF(pwritev2(-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_RDWR | O_DIRECT));
+
+ char buf[16];
+ struct iovec iov;
+ iov.iov_base = buf;
+ iov.iov_len = sizeof(buf);
+
+ EXPECT_THAT(pwritev2(fd.get(), &iov, /*iovcnt=*/1,
+ /*offset=*/0, /*flags=*/0xF0),
+ SyscallFailsWithErrno(EOPNOTSUPP));
+}
+
+} // namespace
+} // namespace testing
+} // namespace gvisor
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