+
+static void TestDevNullFileFd(unsigned int const filemode)
+{
+ SCOPED_TRACE(filemode);
+ FileFd f("/dev/null", filemode);
+ EXPECT_FALSE(f.Failed());
+ EXPECT_TRUE(f.IsOpen());
+ EXPECT_TRUE(f.IsOpen());
+
+ std::string test = "This is a test!\n";
+ EXPECT_TRUE(f.Write(test.c_str(), test.size()));
+ EXPECT_TRUE(f.IsOpen());
+ EXPECT_FALSE(f.Failed());
+
+ f.Close();
+ EXPECT_FALSE(f.IsOpen());
+ EXPECT_FALSE(f.Failed());
+}
+TEST(FileUtlTest, WorkingWithDevNull)
+{
+ TestDevNullFileFd(FileFd::WriteOnly | FileFd::Create);
+ TestDevNullFileFd(FileFd::WriteOnly | FileFd::Create | FileFd::Empty);
+ TestDevNullFileFd(FileFd::WriteOnly | FileFd::Create | FileFd::Exclusive);
+ TestDevNullFileFd(FileFd::WriteOnly | FileFd::Atomic);
+ TestDevNullFileFd(FileFd::WriteOnly | FileFd::Create | FileFd::Atomic);
+ // short-hands for ReadWrite with these modes
+ TestDevNullFileFd(FileFd::WriteEmpty);
+ TestDevNullFileFd(FileFd::WriteAny);
+ TestDevNullFileFd(FileFd::WriteTemp);
+ TestDevNullFileFd(FileFd::WriteAtomic);
+}
+constexpr char const * const TESTSTRING = "This is a test";
+static void TestFailingAtomicKeepsFile(char const * const label, std::string const &filename)
+{
+ SCOPED_TRACE(label);
+ EXPECT_TRUE(FileExists(filename));
+ FileFd fd;
+ EXPECT_TRUE(fd.Open(filename, FileFd::ReadOnly));
+ char buffer[50];
+ EXPECT_NE(nullptr, fd.ReadLine(buffer, sizeof(buffer)));
+ EXPECT_STREQ(TESTSTRING, buffer);
+}
+TEST(FileUtlTest, FailingAtomic)
+{
+ FileFd fd;
+ std::string filename;
+ createTemporaryFile("failingatomic", fd, &filename, TESTSTRING);
+ TestFailingAtomicKeepsFile("init", filename);
+
+ FileFd f;
+ EXPECT_TRUE(f.Open(filename, FileFd::ReadWrite | FileFd::Atomic));
+ f.EraseOnFailure();
+ EXPECT_FALSE(f.Failed());
+ EXPECT_TRUE(f.IsOpen());
+ TestFailingAtomicKeepsFile("before-fail", filename);
+ EXPECT_TRUE(f.Write("Bad file write", 10));
+ f.OpFail();
+ EXPECT_TRUE(f.Failed());
+ TestFailingAtomicKeepsFile("after-fail", filename);
+ EXPECT_TRUE(f.Close());
+ TestFailingAtomicKeepsFile("closed", filename);
+
+ if (filename.empty() == false)
+ unlink(filename.c_str());
+}