/src/FreeRDP/winpr/libwinpr/handle/handle.h

Source
/**
 * WinPR: Windows Portable Runtime
 * Handle Management
 *
 * Copyright 2012 Marc-Andre Moreau <marcandre.moreau@gmail.com>
 *
 * 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.
 */

#ifndef WINPR_HANDLE_PRIVATE_H
#define WINPR_HANDLE_PRIVATE_H

#include <stdlib.h>

#include <winpr/handle.h>
#include <winpr/file.h>
#include <winpr/interlocked.h>
#include <winpr/synch.h>
#include <winpr/winsock.h>

#define HANDLE_TYPE_NONE 0
#define HANDLE_TYPE_PROCESS 1
#define HANDLE_TYPE_THREAD 2
#define HANDLE_TYPE_EVENT 3
#define HANDLE_TYPE_MUTEX 4
#define HANDLE_TYPE_SEMAPHORE 5
#define HANDLE_TYPE_TIMER 6
#define HANDLE_TYPE_NAMED_PIPE 7
#define HANDLE_TYPE_ANONYMOUS_PIPE 8
#define HANDLE_TYPE_ACCESS_TOKEN 9
#define HANDLE_TYPE_FILE 10
#define HANDLE_TYPE_TIMER_QUEUE 11
#define HANDLE_TYPE_TIMER_QUEUE_TIMER 12
#define HANDLE_TYPE_COMM 13

typedef BOOL (*pcIsHandled)(HANDLE handle);
typedef BOOL (*pcCloseHandle)(HANDLE handle);
typedef int (*pcGetFd)(HANDLE handle);
typedef DWORD (*pcCleanupHandle)(HANDLE handle);
typedef BOOL (*pcReadFile)(PVOID Object, LPVOID lpBuffer, DWORD nNumberOfBytesToRead,
                           LPDWORD lpNumberOfBytesRead, LPOVERLAPPED lpOverlapped);
typedef BOOL (*pcReadFileEx)(HANDLE hFile, LPVOID lpBuffer, DWORD nNumberOfBytesToRead,
                             LPOVERLAPPED lpOverlapped,
                             LPOVERLAPPED_COMPLETION_ROUTINE lpCompletionRoutine);
typedef BOOL (*pcReadFileScatter)(HANDLE hFile, FILE_SEGMENT_ELEMENT aSegmentArray[],
                                  DWORD nNumberOfBytesToRead, LPDWORD lpReserved,
                                  LPOVERLAPPED lpOverlapped);
typedef BOOL (*pcWriteFile)(PVOID Object, LPCVOID lpBuffer, DWORD nNumberOfBytesToWrite,
                            LPDWORD lpNumberOfBytesWritten, LPOVERLAPPED lpOverlapped);
typedef BOOL (*pcWriteFileEx)(HANDLE hFile, LPCVOID lpBuffer, DWORD nNumberOfBytesToWrite,
                              LPOVERLAPPED lpOverlapped,
                              LPOVERLAPPED_COMPLETION_ROUTINE lpCompletionRoutine);
typedef BOOL (*pcWriteFileGather)(HANDLE hFile, FILE_SEGMENT_ELEMENT aSegmentArray[],
                                  DWORD nNumberOfBytesToWrite, LPDWORD lpReserved,
                                  LPOVERLAPPED lpOverlapped);
typedef DWORD (*pcGetFileSize)(HANDLE handle, LPDWORD lpFileSizeHigh);
typedef BOOL (*pcGetFileInformationByHandle)(HANDLE handle,
                                             LPBY_HANDLE_FILE_INFORMATION lpFileInformation);
typedef BOOL (*pcFlushFileBuffers)(HANDLE hFile);
typedef BOOL (*pcSetEndOfFile)(HANDLE handle);
typedef DWORD (*pcSetFilePointer)(HANDLE handle, LONG lDistanceToMove, PLONG lpDistanceToMoveHigh,
                                  DWORD dwMoveMethod);
typedef BOOL (*pcSetFilePointerEx)(HANDLE hFile, LARGE_INTEGER liDistanceToMove,
                                   PLARGE_INTEGER lpNewFilePointer, DWORD dwMoveMethod);
typedef BOOL (*pcLockFile)(HANDLE hFile, DWORD dwFileOffsetLow, DWORD dwFileOffsetHigh,
                           DWORD nNumberOfBytesToLockLow, DWORD nNumberOfBytesToLockHigh);
typedef BOOL (*pcLockFileEx)(HANDLE hFile, DWORD dwFlags, DWORD dwReserved,
                             DWORD nNumberOfBytesToLockLow, DWORD nNumberOfBytesToLockHigh,
                             LPOVERLAPPED lpOverlapped);
typedef BOOL (*pcUnlockFile)(HANDLE hFile, DWORD dwFileOffsetLow, DWORD dwFileOffsetHigh,
                             DWORD nNumberOfBytesToUnlockLow, DWORD nNumberOfBytesToUnlockHigh);
typedef BOOL (*pcUnlockFileEx)(HANDLE hFile, DWORD dwReserved, DWORD nNumberOfBytesToUnlockLow,
                               DWORD nNumberOfBytesToUnlockHigh, LPOVERLAPPED lpOverlapped);
typedef BOOL (*pcSetFileTime)(HANDLE hFile, const FILETIME* lpCreationTime,
                              const FILETIME* lpLastAccessTime, const FILETIME* lpLastWriteTime);

typedef struct
{
  pcIsHandled IsHandled;
  pcCloseHandle CloseHandle;
  pcGetFd GetFd;
  pcCleanupHandle CleanupHandle;
  pcReadFile ReadFile;
  pcReadFileEx ReadFileEx;
  pcReadFileScatter ReadFileScatter;
  pcWriteFile WriteFile;
  pcWriteFileEx WriteFileEx;
  pcWriteFileGather WriteFileGather;
  pcGetFileSize GetFileSize;
  pcFlushFileBuffers FlushFileBuffers;
  pcSetEndOfFile SetEndOfFile;
  pcSetFilePointer SetFilePointer;
  pcSetFilePointerEx SetFilePointerEx;
  pcLockFile LockFile;
  pcLockFileEx LockFileEx;
  pcUnlockFile UnlockFile;
  pcUnlockFileEx UnlockFileEx;
  pcSetFileTime SetFileTime;
  pcGetFileInformationByHandle GetFileInformationByHandle;
} HANDLE_OPS;

typedef struct
{
  ULONG Type;
  ULONG Mode;
  HANDLE_OPS* ops;
  volatile LONG refCount;
} WINPR_HANDLE;

WINPR_ATTR_NODISCARD
static inline BOOL WINPR_HANDLE_IS_HANDLED(HANDLE handle, ULONG type, BOOL invalidValue)
{
  WINPR_HANDLE* pWinprHandle = (WINPR_HANDLE*)handle;
  BOOL invalid = !pWinprHandle;

  if (invalidValue)
  {
    if (INVALID_HANDLE_VALUE == pWinprHandle)
      invalid = TRUE;
  }

  if (invalid || (pWinprHandle->Type != type))
  {
    SetLastError(ERROR_INVALID_HANDLE);
    return FALSE;
  }

  return TRUE;
}

static inline void WINPR_HANDLE_SET_TYPE_AND_MODE(void* _handle, ULONG _type, ULONG _mode)
{
  WINPR_HANDLE* hdl = (WINPR_HANDLE*)_handle;

  hdl->Type = _type;
  hdl->Mode = _mode;
  hdl->refCount = 1;
}

WINPR_ATTR_NODISCARD
static inline BOOL winpr_Handle_GetInfo(HANDLE handle, ULONG* pType, WINPR_HANDLE** pObject)
{
  WINPR_HANDLE* wHandle = nullptr;

  if (handle == nullptr)
    return FALSE;

  /* INVALID_HANDLE_VALUE is an invalid value for every handle, but it
   * confuses the clang scanbuild analyzer. */
#ifndef __clang_analyzer__
  if (handle == INVALID_HANDLE_VALUE)
    return FALSE;
#endif

  wHandle = (WINPR_HANDLE*)handle;

  *pType = wHandle->Type;
  *pObject = wHandle;

  return TRUE;
}

static inline void winpr_Handle_AddRef(HANDLE handle)
{
  ULONG type = 0;
  WINPR_HANDLE* hdl = nullptr;

  if (!winpr_Handle_GetInfo(handle, &type, &hdl) || !hdl)
    return;

  InterlockedIncrement(&hdl->refCount);
}

/* implemented in nonehandle.c: turns an already-released handle (see CloseHandle() in handle.c)
 * into a harmless placeholder, for as long as other references to the same struct remain. */
void winpr_Handle_ConvertToNone(HANDLE handle);

/* decrements refCount and frees the struct once it reaches zero - does not touch the underlying
 * OS resource, that's the type's real CloseHandle op's job (see CloseHandle() in handle.c).
 * Returns TRUE if this was the last reference (the handle has been freed). */
static inline BOOL winpr_Handle_Release(HANDLE handle)
{
  ULONG type = 0;
  WINPR_HANDLE* hdl = nullptr;

  if (!winpr_Handle_GetInfo(handle, &type, &hdl) || !hdl)
    return FALSE;

  if (InterlockedDecrement(&hdl->refCount) > 0)
    return FALSE;

  free(hdl);
  return TRUE;
}

WINPR_ATTR_NODISCARD
static inline int winpr_Handle_getFd(HANDLE handle)
{
  WINPR_HANDLE* hdl = nullptr;
  ULONG type = 0;

  if (!winpr_Handle_GetInfo(handle, &type, &hdl))
    return -1;

  if (!hdl || !hdl->ops || !hdl->ops->GetFd)
    return -1;

  return hdl->ops->GetFd(handle);
}

WINPR_ATTR_NODISCARD
static inline DWORD winpr_Handle_cleanup(HANDLE handle)
{
  WINPR_HANDLE* hdl = nullptr;
  ULONG type = 0;

  if (!winpr_Handle_GetInfo(handle, &type, &hdl))
    return WAIT_FAILED;

  if (!hdl || !hdl->ops)
    return WAIT_FAILED;

  /* If there is no cleanup function, assume all ok. */
  if (!hdl->ops->CleanupHandle)
    return WAIT_OBJECT_0;

  return hdl->ops->CleanupHandle(handle);
}

WINPR_ATTR_NODISCARD
BOOL winpr_set_cloexec(int fd, BOOL cloexec);

#endif /* WINPR_HANDLE_PRIVATE_H */

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Created: 2026-09-03 07:19