118 lines
3.4 KiB
C++
118 lines
3.4 KiB
C++
// Copyright 2018 Google LLC
|
|
//
|
|
// 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 <unistd.h>
|
|
#include <vector>
|
|
|
|
#include "gtest/gtest.h"
|
|
#include "test/util/file_descriptor.h"
|
|
#include "test/util/temp_path.h"
|
|
#include "test/util/test_util.h"
|
|
|
|
namespace gvisor {
|
|
namespace testing {
|
|
|
|
namespace {
|
|
|
|
class ReadTest : public ::testing::Test {
|
|
void SetUp() override {
|
|
name_ = NewTempAbsPath();
|
|
int fd;
|
|
ASSERT_THAT(fd = open(name_.c_str(), O_CREAT, 0644), SyscallSucceeds());
|
|
ASSERT_THAT(close(fd), SyscallSucceeds());
|
|
}
|
|
|
|
void TearDown() override { unlink(name_.c_str()); }
|
|
|
|
public:
|
|
std::string name_;
|
|
};
|
|
|
|
TEST_F(ReadTest, ZeroBuffer) {
|
|
int fd;
|
|
ASSERT_THAT(fd = open(name_.c_str(), O_RDWR), SyscallSucceeds());
|
|
|
|
char msg[] = "hello world";
|
|
EXPECT_THAT(PwriteFd(fd, msg, strlen(msg), 0),
|
|
SyscallSucceedsWithValue(strlen(msg)));
|
|
|
|
char buf[10];
|
|
EXPECT_THAT(ReadFd(fd, buf, 0), SyscallSucceedsWithValue(0));
|
|
EXPECT_THAT(close(fd), SyscallSucceeds());
|
|
}
|
|
|
|
TEST_F(ReadTest, EmptyFileReturnsZeroAtEOF) {
|
|
int fd;
|
|
ASSERT_THAT(fd = open(name_.c_str(), O_RDWR), SyscallSucceeds());
|
|
|
|
char eof_buf[10];
|
|
EXPECT_THAT(ReadFd(fd, eof_buf, 10), SyscallSucceedsWithValue(0));
|
|
EXPECT_THAT(close(fd), SyscallSucceeds());
|
|
}
|
|
|
|
TEST_F(ReadTest, EofAfterRead) {
|
|
int fd;
|
|
ASSERT_THAT(fd = open(name_.c_str(), O_RDWR), SyscallSucceeds());
|
|
|
|
// Write some bytes to be read.
|
|
constexpr char kMessage[] = "hello world";
|
|
EXPECT_THAT(PwriteFd(fd, kMessage, sizeof(kMessage), 0),
|
|
SyscallSucceedsWithValue(sizeof(kMessage)));
|
|
|
|
// Read all of the bytes at once.
|
|
char buf[sizeof(kMessage)];
|
|
EXPECT_THAT(ReadFd(fd, buf, sizeof(kMessage)),
|
|
SyscallSucceedsWithValue(sizeof(kMessage)));
|
|
|
|
// Read again with a non-zero buffer and expect EOF.
|
|
char eof_buf[10];
|
|
EXPECT_THAT(ReadFd(fd, eof_buf, 10), SyscallSucceedsWithValue(0));
|
|
EXPECT_THAT(close(fd), SyscallSucceeds());
|
|
}
|
|
|
|
TEST_F(ReadTest, DevNullReturnsEof) {
|
|
int fd;
|
|
ASSERT_THAT(fd = open("/dev/null", O_RDONLY), SyscallSucceeds());
|
|
std::vector<char> buf(1);
|
|
EXPECT_THAT(ReadFd(fd, buf.data(), 1), SyscallSucceedsWithValue(0));
|
|
EXPECT_THAT(close(fd), SyscallSucceeds());
|
|
}
|
|
|
|
const int kReadSize = 128 * 1024;
|
|
|
|
// Do not allow random save as it could lead to partial reads.
|
|
TEST_F(ReadTest, CanReadFullyFromDevZero_NoRandomSave) {
|
|
int fd;
|
|
ASSERT_THAT(fd = open("/dev/zero", O_RDONLY), SyscallSucceeds());
|
|
|
|
std::vector<char> buf(kReadSize, 1);
|
|
EXPECT_THAT(ReadFd(fd, buf.data(), kReadSize),
|
|
SyscallSucceedsWithValue(kReadSize));
|
|
EXPECT_THAT(close(fd), SyscallSucceeds());
|
|
EXPECT_EQ(std::vector<char>(kReadSize, 0), buf);
|
|
}
|
|
|
|
TEST_F(ReadTest, ReadDirectoryFails) {
|
|
const FileDescriptor file =
|
|
ASSERT_NO_ERRNO_AND_VALUE(Open(GetAbsoluteTestTmpdir(), O_RDONLY));
|
|
std::vector<char> buf(1);
|
|
EXPECT_THAT(ReadFd(file.get(), buf.data(), 1), SyscallFailsWithErrno(EISDIR));
|
|
}
|
|
|
|
} // namespace
|
|
|
|
} // namespace testing
|
|
} // namespace gvisor
|