/// <summary>
/// Close all handles to the device and unregisters device removal notification.
/// </summary>
private void CloseDevice()
{
DebugWriteLine("CloseDevice()");
_deviceAvailable = false;
if (_readHandle == null && _writeHandle == null)
{
DebugWriteLine("Device already closed");
return;
}
if (_readHandle != null)
{
_notifyWindow.UnregisterDeviceRemoval();
_readHandle.DangerousRelease();
_readHandle.Dispose();
_readHandle = null;
}
if (_writeHandle != null)
{
_writeHandle.Dispose();
_writeHandle = null;
}
}
/// <summary>
/// Polls a File Descriptor for the passed in flags.
/// </summary>
/// <param name="fd">The descriptor to poll</param>
/// <param name="events">The events to poll for</param>
/// <param name="timeout">The amount of time to wait; -1 for infinite, 0 for immediate return, and a positive number is the number of milliseconds</param>
/// <param name="triggered">The events that were returned by the poll call. May be PollEvents.POLLNONE in the case of a timeout.</param>
/// <returns>An error or Error.SUCCESS.</returns>
internal static unsafe Error Poll(SafeFileHandle fd, PollEvents events, int timeout, out PollEvents triggered)
{
bool gotRef = false;
try
{
fd.DangerousAddRef(ref gotRef);
var pollEvent = new PollEvent
{
FileDescriptor = fd.DangerousGetHandle().ToInt32(),
Events = events,
};
uint unused;
Error err = Poll(&pollEvent, 1, timeout, &unused);
triggered = pollEvent.TriggeredEvents;
return err;
}
finally
{
if (gotRef)
{
fd.DangerousRelease();
}
}
}
/// <summary>
/// Polls a File Descriptor for the passed in flags.
/// </summary>
/// <param name="fd">The descriptor to poll</param>
/// <param name="events">The events to poll for</param>
/// <param name="timeout">The amount of time to wait; -1 for infinite, 0 for immediate return, and a positive number is the number of milliseconds</param>
/// <param name="triggered">The events that were returned by the poll call. May be PollEvents.POLLNONE in the case of a timeout.</param>
/// <returns>An error or Error.SUCCESS.</returns>
internal static unsafe Error Poll(SafeFileHandle fd, PollEvents events, int timeout, out PollEvents triggered)
{
bool gotRef = false;
try
{
fd.DangerousAddRef(ref gotRef);
var pollEvent = new PollEvent
{
FileDescriptor = fd.DangerousGetHandle().ToInt32(),
Events = events,
};
uint unused;
Error err = Poll(&pollEvent, 1, timeout, &unused);
triggered = pollEvent.TriggeredEvents;
return(err);
}
finally
{
if (gotRef)
{
fd.DangerousRelease();
}
}
}
public IntPtr AddRef_GetHandle_Release()
{
bool success = false;
try
{
_sfh.DangerousAddRef(ref success);
return(_sfh.DangerousGetHandle());
}
finally
{
if (success)
{
_sfh.DangerousRelease();
}
}
}
/// <summary>
/// Reads a number of bytes from an open file descriptor into a specified buffer.
/// </summary>
/// <param name="fd">The open file descriptor to try to read from</param>
/// <param name="buffer">The buffer to read info into</param>
/// <param name="count">The size of the buffer</param>
/// <returns>
/// Returns the number of bytes read on success; otherwise, -1 is returned
/// Note - on fail. the position of the stream may change depending on the platform; consult man 2 read for more info
/// </returns>
internal static unsafe int Read(SafeFileHandle fd, byte *buffer, int count)
{
int bytes_read = -1;
bool release = false;
try {
fd.DangerousAddRef(ref release);
do
{
bytes_read = Read(fd.DangerousGetHandle(), buffer, count);
} while (bytes_read < 0 && Marshal.GetLastWin32Error() == (int)Interop.Error.EINTR);
}
finally {
if (release)
{
fd.DangerousRelease();
}
}
return(bytes_read);
}
public static bool flushPosix(FileStream fs)
{
if (fsync == null)
{
ResolveFSync();
}
bool success = false;
SafeFileHandle handle = fs.SafeFileHandle;
RuntimeHelpers.PrepareConstrainedRegions();
try
{
handle.DangerousAddRef(ref success);
return(fsync(handle.DangerousGetHandle().ToInt32()) == 0);
}
finally
{
if (success)
{
handle.DangerousRelease();
}
}
}
private static SafeFileHandle CreateNewSharedMemoryObject(
string mapName, Interop.libc.MemoryMappedProtections protections, long capacity)
{
// Determine the flags to use when creating the shared memory object
Interop.libc.OpenFlags flags = (protections & Interop.libc.MemoryMappedProtections.PROT_WRITE) != 0 ?
Interop.libc.OpenFlags.O_RDWR :
Interop.libc.OpenFlags.O_RDONLY;
flags |= Interop.libc.OpenFlags.O_CREAT | Interop.libc.OpenFlags.O_EXCL; // CreateNew
// Create the shared memory object
int fd;
Interop.CheckIo(fd = Interop.libc.shm_open(mapName, flags, (int)Interop.libc.Permissions.S_IRWXU), mapName);
SafeFileHandle fileHandle = new SafeFileHandle((IntPtr)fd, ownsHandle: true);
// Then enlarge it to the requested capacity
bool gotFd = false;
fileHandle.DangerousAddRef(ref gotFd);
try
{
while (Interop.CheckIo(Interop.libc.ftruncate((int)fileHandle.DangerousGetHandle(), capacity), mapName))
{
;
}
}
finally
{
if (gotFd)
{
fileHandle.DangerousRelease();
}
}
// Return the fd for the object
return(fileHandle);
}
public static void BadHandleKind_Throws_IOException(PipeDirection direction)
{
using (FileStream fs = new FileStream(Path.Combine(Path.GetTempPath(), "_BadHandleKind_Throws_IOException_" + Path.GetRandomFileName()), FileMode.Create, FileAccess.Write, FileShare.None, 8, FileOptions.DeleteOnClose))
{
SafeFileHandle safeHandle = fs.SafeFileHandle;
bool gotRef = false;
try
{
safeHandle.DangerousAddRef(ref gotRef);
IntPtr handle = safeHandle.DangerousGetHandle();
SafePipeHandle fakePipeHandle = new SafePipeHandle(handle, ownsHandle: false);
Assert.Throws <IOException>(() => new NamedPipeServerStream(direction, false, true, fakePipeHandle));
}
finally
{
if (gotRef)
{
safeHandle.DangerousRelease();
}
}
}
}
public static void ClientBadHandleKindThrows()
{
using (FileStream fs = new FileStream("tempTestFile", FileMode.Create, FileAccess.Write, FileShare.None, 8, FileOptions.DeleteOnClose))
{
SafeFileHandle safeHandle = fs.SafeFileHandle;
bool gotRef = false;
try
{
safeHandle.DangerousAddRef(ref gotRef);
IntPtr handle = safeHandle.DangerousGetHandle();
SafePipeHandle fakePipeHandle = new SafePipeHandle(handle, ownsHandle: false);
Assert.Throws <IOException>(() => new NamedPipeClientStream(PipeDirection.InOut, false, true, fakePipeHandle));
}
finally
{
if (gotRef)
{
safeHandle.DangerousRelease();
}
}
}
}
private static string WinInternalGetTarget(SafeFileHandle handle)
{
int outBufferSize = ClrFacade.SizeOf<REPARSE_DATA_BUFFER_SYMBOLICLINK>();
IntPtr outBuffer = Marshal.AllocHGlobal(outBufferSize);
bool success = false;
try
{
int bytesReturned;
//OACR warning 62001 about using DeviceIOControl has been disabled.
// According to MSDN guidance DangerousAddRef() and DangerousRelease() have been used.
handle.DangerousAddRef(ref success);
bool result = DeviceIoControl(handle.DangerousGetHandle(), FSCTL_GET_REPARSE_POINT,
IntPtr.Zero, 0, outBuffer, outBufferSize, out bytesReturned, IntPtr.Zero);
if (!result)
{
int lastError = Marshal.GetLastWin32Error();
if (lastError == ERROR_NOT_A_REPARSE_POINT)
return null;
throw new Win32Exception(lastError);
}
//Unmarshal to symbolic link to look for tags.
REPARSE_DATA_BUFFER_SYMBOLICLINK reparseDataBuffer = ClrFacade.PtrToStructure<REPARSE_DATA_BUFFER_SYMBOLICLINK>(outBuffer);
if (reparseDataBuffer.ReparseTag != IO_REPARSE_TAG_SYMLINK && reparseDataBuffer.ReparseTag != IO_REPARSE_TAG_MOUNT_POINT)
return null;
string targetDir = null;
if (reparseDataBuffer.ReparseTag == IO_REPARSE_TAG_SYMLINK)
{
targetDir = Encoding.Unicode.GetString(reparseDataBuffer.PathBuffer, reparseDataBuffer.SubstituteNameOffset, reparseDataBuffer.SubstituteNameLength);
}
if (reparseDataBuffer.ReparseTag == IO_REPARSE_TAG_MOUNT_POINT)
{
//Since this is a junction we need to unmarshal to the correct structure.
REPARSE_DATA_BUFFER_MOUNTPOINT reparseDataBufferMountPoint = ClrFacade.PtrToStructure<REPARSE_DATA_BUFFER_MOUNTPOINT>(outBuffer);
targetDir = Encoding.Unicode.GetString(reparseDataBufferMountPoint.PathBuffer, reparseDataBufferMountPoint.SubstituteNameOffset, reparseDataBufferMountPoint.SubstituteNameLength);
}
if (targetDir.StartsWith(NonInterpretedPathPrefix, StringComparison.OrdinalIgnoreCase))
targetDir = targetDir.Substring(NonInterpretedPathPrefix.Length);
return targetDir;
}
finally
{
if (success)
{
handle.DangerousRelease();
}
Marshal.FreeHGlobal(outBuffer);
}
}
internal static bool WinIsHardLink(FileSystemInfo fileInfo)
{
bool isHardLink = false;
// only check for hard link if the item is not directory
if (!((fileInfo.Attributes & System.IO.FileAttributes.Directory) == System.IO.FileAttributes.Directory))
{
IntPtr nativeHandle = InternalSymbolicLinkLinkCodeMethods.CreateFile(
fileInfo.FullName,
InternalSymbolicLinkLinkCodeMethods.FileDesiredAccess.GenericRead,
InternalSymbolicLinkLinkCodeMethods.FileShareMode.Read,
IntPtr.Zero,
InternalSymbolicLinkLinkCodeMethods.FileCreationDisposition.OpenExisting,
InternalSymbolicLinkLinkCodeMethods.FileAttributes.Normal,
IntPtr.Zero);
using (SafeFileHandle handle = new SafeFileHandle(nativeHandle, true))
{
bool success = false;
try
{
handle.DangerousAddRef(ref success);
IntPtr dangerousHandle = handle.DangerousGetHandle();
isHardLink = InternalSymbolicLinkLinkCodeMethods.IsHardLink(ref dangerousHandle);
}
finally
{
if (success)
handle.DangerousRelease();
}
}
}
return isHardLink;
}