// 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/stat.h> #include <sys/types.h> #include <string> #include "gtest/gtest.h" #include "test/util/fs_util.h" #include "test/util/temp_path.h" #include "test/util/test_util.h" namespace gvisor { namespace testing { namespace { constexpr int kMode = 0666; TEST(CreatTest, CreatCreatesNewFile) { std::string const path = NewTempAbsPath(); struct stat buf; int fd; ASSERT_THAT(stat(path.c_str(), &buf), SyscallFailsWithErrno(ENOENT)); ASSERT_THAT(fd = creat(path.c_str(), kMode), SyscallSucceeds()); EXPECT_THAT(close(fd), SyscallSucceeds()); EXPECT_THAT(stat(path.c_str(), &buf), SyscallSucceeds()); } TEST(CreatTest, CreatTruncatesExistingFile) { auto temp_path = ASSERT_NO_ERRNO_AND_VALUE(TempPath::CreateFile()); int fd; ASSERT_NO_ERRNO(SetContents(temp_path.path(), "non-empty")); ASSERT_THAT(fd = creat(temp_path.path().c_str(), kMode), SyscallSucceeds()); EXPECT_THAT(close(fd), SyscallSucceeds()); std::string new_contents; ASSERT_NO_ERRNO(GetContents(temp_path.path(), &new_contents)); EXPECT_EQ("", new_contents); } TEST(CreatTest, CreatWithNameTooLong) { // Start with a unique name, and pad it to NAME_MAX + 1; std::string name = NewTempRelPath(); int padding = (NAME_MAX + 1) - name.size(); name.append(padding, 'x'); const std::string& path = JoinPath(GetAbsoluteTestTmpdir(), name); // Creation should return ENAMETOOLONG. ASSERT_THAT(creat(path.c_str(), kMode), SyscallFailsWithErrno(ENAMETOOLONG)); } } // namespace } // namespace testing } // namespace gvisor