private static OpenFileResult TryOpenDirectory(
string directoryPath,
FileDesiredAccess desiredAccess,
FileShare shareMode,
FileMode fileMode,
FileFlagsAndAttributes flagsAndAttributes,
out SafeFileHandle handle)
{
Contract.Requires(!string.IsNullOrEmpty(directoryPath));
if (flagsAndAttributes.HasFlag(FileFlagsAndAttributes.FileFlagOpenReparsePoint) &&
IsSymlink(directoryPath))
{
return(TryOpenSymlink(directoryPath, desiredAccess, shareMode, fileMode, out handle));
}
try
{
FileStream fs = new FileStream(directoryPath, fileMode, FileDesiredAccessToFileAccess(desiredAccess), shareMode, DefaultBufferSize, FileFlagsAndAttributesToFileOptions(flagsAndAttributes | FileFlagsAndAttributes.FileFlagBackupSemantics));
handle = fs.SafeFileHandle;
return(OpenFileResult.Create(NativeIOConstants.ErrorSuccess, fileMode, handleIsValid: true, openingById: false));
}
catch (Exception ex)
{
handle = null;
int nativeErrorCode = (int)NativeErrorCodeForException(ex);
Logger.Log.StorageTryOpenDirectoryFailure(Events.StaticContext, directoryPath, nativeErrorCode);
return(OpenFileResult.Create(nativeErrorCode, fileMode, handleIsValid: false, openingById: false));
}
}
/// <inheritdoc />
public OpenFileResult TryCreateOrOpenFile(
string path,
FileDesiredAccess desiredAccess,
FileShare shareMode,
FileMode creationDisposition,
FileFlagsAndAttributes flagsAndAttributes,
out SafeFileHandle handle)
{
if (flagsAndAttributes.HasFlag(FileFlagsAndAttributes.FileFlagOpenReparsePoint) &&
IsSymlink(path))
{
return(TryOpenSymlink(path, desiredAccess, shareMode, creationDisposition, out handle));
}
try
{
FileStream fs = new FileStream(path, creationDisposition, FileDesiredAccessToFileAccess(desiredAccess), shareMode, DefaultBufferSize, FileFlagsAndAttributesToFileOptions(flagsAndAttributes));
handle = fs.SafeFileHandle;
return(OpenFileResult.Create(NativeIOConstants.ErrorSuccess, creationDisposition, handleIsValid: true, openingById: false));
}
catch (Exception ex)
{
handle = null;
var errorCode = NativeErrorCodeForException(ex);
Logger.Log.StorageTryOpenOrCreateFileFailure(Events.StaticContext, path, (int)creationDisposition, (int)errorCode);
return(OpenFileResult.Create((int)errorCode, creationDisposition, handleIsValid: false, openingById: false));
}
}
private OpenFileResult TryOpen(
string path,
FileDesiredAccess desiredAccess,
FileShare shareMode,
FileMode fileMode,
bool openSymlink,
out SafeFileHandle handle)
{
try
{
var mayBeExistence = TryProbePathExistence(path, openSymlink);
handle = Open(path, CreateOpenFlags(desiredAccess, shareMode, fileMode, openSymlink), CreateFilePermissions(desiredAccess));
if (handle.IsInvalid)
{
handle = null;
return(CreateErrorResult(Marshal.GetLastWin32Error()));
}
int successCode =
mayBeExistence.Succeeded && mayBeExistence.Result == PathExistence.ExistsAsFile
? NativeIOConstants.ErrorFileExists
: (mayBeExistence.Succeeded && mayBeExistence.Result == PathExistence.ExistsAsDirectory
? NativeIOConstants.ErrorAlreadyExists
: NativeIOConstants.ErrorSuccess);
return(OpenFileResult.Create(path, successCode, fileMode, handleIsValid: true));
}
catch (Exception e)
{
handle = null;
return(CreateErrorResult((int)NativeErrorCodeForException(e)));
}
OpenFileResult CreateErrorResult(int errorCode)
{
Logger.Log.StorageTryOpenOrCreateFileFailure(Events.StaticContext, path, (int)fileMode, (int)errorCode);
return(OpenFileResult.Create(path, (int)errorCode, fileMode, handleIsValid: false));
}
}
public void OpenFileResultFindHandlesOnSharingViolation()
{
var file = GetFullPath("test.txt");
var dummyBlockedResult = OpenFileResult.Create(file, NativeIOConstants.ErrorSharingViolation, FileMode.Create, handleIsValid: false);
var dummyArbitraryFailResult = OpenFileResult.Create(file, NativeIOConstants.ErrorHandleEof, FileMode.Create, handleIsValid: false);
using (var stream = new FileStream(file, FileMode.OpenOrCreate, FileAccess.ReadWrite, FileShare.None))
{
var dummyBlockedError = dummyBlockedResult.CreateExceptionForError();
XAssert.IsTrue(dummyBlockedError.Message.Contains(FileUtilitiesMessages.ActiveHandleUsage));
var dummyBlockedFailure = dummyBlockedResult.CreateFailureForError();
XAssert.IsTrue(dummyBlockedFailure.DescribeIncludingInnerFailures().Contains(FileUtilitiesMessages.ActiveHandleUsage));
var dummyArbitraryError = dummyArbitraryFailResult.CreateExceptionForError();
XAssert.IsFalse(dummyArbitraryError.Message.Contains(FileUtilitiesMessages.ActiveHandleUsage));
var dummyArbitraryFailure = dummyArbitraryFailResult.CreateFailureForError();
XAssert.IsFalse(dummyArbitraryFailure.DescribeIncludingInnerFailures().Contains(FileUtilitiesMessages.ActiveHandleUsage));
}
}
private static OpenFileResult TryOpenSymlink(
string path,
FileDesiredAccess desiredAccess,
FileShare shareMode,
FileMode fileMode,
out SafeFileHandle handle)
{
try
{
int fileHandle = 0;
if (ShouldCreateAndOpen(fileMode))
{
fileHandle = openAndCreate(path, (int)(CreateOpenFlags(desiredAccess, shareMode, fileMode) | OpenFlags.O_SYMLINK), CreateFilePermissions(desiredAccess));
}
else
{
fileHandle = open(path, (int)(CreateOpenFlags(desiredAccess, shareMode, fileMode) | OpenFlags.O_SYMLINK));
}
handle = new SafeFileHandle(new IntPtr(fileHandle), ownsHandle: true);
if (fileHandle <= 0)
{
handle = null;
return(CreateErrorResult(Marshal.GetLastWin32Error()));
}
return(OpenFileResult.Create(NativeIOConstants.ErrorSuccess, fileMode, handleIsValid: true, openingById: false));
}
catch (Exception e)
{
handle = null;
return(CreateErrorResult((int)NativeErrorCodeForException(e)));
}
OpenFileResult CreateErrorResult(int errorCode)
{
Logger.Log.StorageTryOpenOrCreateFileFailure(Events.StaticContext, path, (int)fileMode, (int)errorCode);
return(OpenFileResult.Create((int)errorCode, fileMode, handleIsValid: false, openingById: false));
}
}