source: vbox/trunk/include/VBox/HostServices/GuestControlSvc.h@ 73768

/* $Id: GuestControlSvc.h 71364 2018-03-16 09:58:05Z vboxsync $ */
/** @file
 * Guest control service - Common header for host service and guest clients.
 */

/*
 * Copyright (C) 2011-2018 Oracle Corporation
 *
 * This file is part of VirtualBox Open Source Edition (OSE), as
 * available from http://www.virtualbox.org. This file is free software;
 * you can redistribute it and/or modify it under the terms of the GNU
 * General Public License (GPL) as published by the Free Software
 * Foundation, in version 2 as it comes in the "COPYING" file of the
 * VirtualBox OSE distribution. VirtualBox OSE is distributed in the
 * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
 *
 * The contents of this file may alternatively be used under the terms
 * of the Common Development and Distribution License Version 1.0
 * (CDDL) only, as it comes in the "COPYING.CDDL" file of the
 * VirtualBox OSE distribution, in which case the provisions of the
 * CDDL are applicable instead of those of the GPL.
 *
 * You may elect to license modified versions of this file under the
 * terms and conditions of either the GPL or the CDDL or both.
 */

#ifndef ___VBox_HostService_GuestControlService_h
#define ___VBox_HostService_GuestControlService_h

#include <VBox/VMMDevCoreTypes.h>
#include <VBox/VBoxGuestCoreTypes.h>
#include <VBox/hgcmsvc.h>
#include <iprt/assert.h>

/* Everything defined in this file lives in this namespace. */
namespace guestControl {

/******************************************************************************
* Typedefs, constants and inlines                                             *
******************************************************************************/

#define HGCMSERVICE_NAME "VBoxGuestControlSvc"

/** Maximum number of concurrent guest sessions a VM can have. */
#define VBOX_GUESTCTRL_MAX_SESSIONS     32
/** Maximum number of concurrent guest objects (processes, files, ...)
 *  a guest session can have. */
#define VBOX_GUESTCTRL_MAX_OBJECTS      _2K
/** Maximum of callback contexts a guest process can have. */
#define VBOX_GUESTCTRL_MAX_CONTEXTS     _64K

/** Base (start) of guest control session IDs. Session
 *  ID 0 is reserved for the root process which
 *  hosts all other guest session processes. */
#define VBOX_GUESTCTRL_SESSION_ID_BASE  1

/** Builds a context ID out of the session ID, object ID and an
 *  increasing count. */
#define VBOX_GUESTCTRL_CONTEXTID_MAKE(uSession, uObject, uCount) \
    (  (uint32_t)((uSession) &   0x1f) << 27 \
     | (uint32_t)((uObject)  &  0x7ff) << 16 \
     | (uint32_t)((uCount)   & 0xffff)       \
    )
/** Creates a context ID out of a session ID. */
#define VBOX_GUESTCTRL_CONTEXTID_MAKE_SESSION(uSession) \
    ((uint32_t)((uSession) & 0x1f) << 27)
/** Gets the session ID out of a context ID. */
#define VBOX_GUESTCTRL_CONTEXTID_GET_SESSION(uContextID) \
    (((uContextID) >> 27) & 0x1f)
/** Gets the process ID out of a context ID. */
#define VBOX_GUESTCTRL_CONTEXTID_GET_OBJECT(uContextID) \
    (((uContextID) >> 16) & 0x7ff)
/** Gets the context count of a process out of a context ID. */
#define VBOX_GUESTCTRL_CONTEXTID_GET_COUNT(uContextID) \
    ((uContextID) & 0xffff)
/** Filter context IDs by session. Can be used in conjunction
 *  with VbglR3GuestCtrlMsgFilterSet(). */
#define VBOX_GUESTCTRL_FILTER_BY_SESSION(uSession) \
    (VBOX_GUESTCTRL_CONTEXTID_MAKE_SESSION(uSession) | 0xF8000000)

/**
 * Structure keeping the context of a host callback.
 */
typedef struct VBoxGuestCtrlHostCbCtx
{
    /** HGCM Function number. */
    uint32_t uFunction;
    /** The context ID. */
    uint32_t uContextID;
    /** Protocol version of this guest session. Might
     *  be 0 if not supported. */
    uint32_t uProtocol;

} VBOXGUESTCTRLHOSTCBCTX, *PVBOXGUESTCTRLHOSTCBCTX;

/**
 * Structure for low level HGCM host callback from
 * the guest. No deep copy. */
typedef struct VBoxGuestCtrlHostCallback
{
    VBoxGuestCtrlHostCallback(uint32_t cParms, VBOXHGCMSVCPARM paParms[])
                                : mParms(cParms), mpaParms(paParms) { }

    /** Number of HGCM parameters. */
    uint32_t mParms;
    /** Actual HGCM parameters. */
    PVBOXHGCMSVCPARM mpaParms;

} VBOXGUESTCTRLHOSTCALLBACK, *PVBOXGUESTCTRLHOSTCALLBACK;

/**
 * The service functions which are callable by host.
 */
enum eHostFn
{
    /**
     * The host asks the client to cancel all pending waits and exit.
     */
    HOST_CANCEL_PENDING_WAITS = 0,
    /**
     * The host wants to create a guest session.
     */
    HOST_SESSION_CREATE = 20,
    /**
     * The host wants to close a guest session.
     */
    HOST_SESSION_CLOSE = 21,
    /**
     * The host wants to execute something in the guest. This can be a command line
     * or starting a program.
     ** Note: Legacy (VBox < 4.3) command.
     */
    HOST_EXEC_CMD = 100,
    /**
     * Sends input data for stdin to a running process executed by HOST_EXEC_CMD.
     ** Note: Legacy (VBox < 4.3) command.
     */
    HOST_EXEC_SET_INPUT = 101,
    /**
     * Gets the current status of a running process, e.g.
     * new data on stdout/stderr, process terminated etc.
     ** Note: Legacy (VBox < 4.3) command.
     */
    HOST_EXEC_GET_OUTPUT = 102,
    /**
     * Terminates a running guest process.
     */
    HOST_EXEC_TERMINATE = 110,
    /**
     * Waits for a certain event to happen. This can be an input, output
     * or status event.
     */
    HOST_EXEC_WAIT_FOR = 120,
    /**
     * Opens a guest file.
     */
    HOST_FILE_OPEN = 240,
    /**
     * Closes a guest file.
     */
    HOST_FILE_CLOSE = 241,
    /**
     * Reads from an opened guest file.
     */
    HOST_FILE_READ = 250,
    /**
     * Reads from an opened guest file at
     * a specified offset.
     */
    HOST_FILE_READ_AT = 251,
    /**
     * Write to an opened guest file.
     */
    HOST_FILE_WRITE = 260,
    /**
     * Write to an opened guest file at
     * a specified offset.
     */
    HOST_FILE_WRITE_AT = 261,
    /**
     * Changes the read & write position of an opened guest file.
     */
    HOST_FILE_SEEK = 270,
    /**
     * Gets the current file position of an opened guest file.
     */
    HOST_FILE_TELL = 271,
    /**
     * Removes a directory on the guest.
     */
    HOST_DIR_REMOVE = 320,
    /**
     * Renames a path on the guest.
     */
    HOST_PATH_RENAME = 330,
    /**
     * Retrieves the user's documents directory.
     */
    HOST_PATH_USER_DOCUMENTS = 331,
    /**
     * Retrieves the user's home directory.
     */
    HOST_PATH_USER_HOME = 332
};

/**
 * The service functions which are called by guest. The numbers may not change,
 * so we hardcode them.
 */
enum eGuestFn
{
    /**
     * Guest waits for a new message the host wants to process on the guest side.
     * This is a blocking call and can be deferred.
     *
     * @note This command is rather odd.  The above description isn't really
     *       correct.  Yes, it (1) waits for a new message and will return the
     *       mesage number and parameter count when one is available.   However, it
     *       is also (2) used to retrieve the message parameters.   For some weird
     *       reasons it was decided that it should always return VERR_TOO_MUCH_DATA
     *       when used in the first capacity.
     *
     * @todo r=bird: Next time this interface gets a major adjustment, please split
     *       this function up into two calls and, for heavens sake, make them return
     *       VINF_SUCCESS on success.
     */
    GUEST_MSG_WAIT = 1,
    /**
     * Guest asks the host to cancel all pending waits the guest itself waits on.
     * This becomes necessary when the guest wants to quit but still waits for
     * commands from the host.
     */
    GUEST_CANCEL_PENDING_WAITS = 2,
    /**
     * Guest disconnected (terminated normally or due to a crash HGCM
     * detected when calling service::clientDisconnect().
     */
    GUEST_DISCONNECTED = 3,
    /**
     * Sets a message filter to only get messages which have a certain
     * context ID scheme (that is, a specific session, object etc).
     * Since VBox 4.3+.
     */
    GUEST_MSG_FILTER_SET = 4,
    /**
     * Unsets (and resets) a previously set message filter.
     */
    GUEST_MSG_FILTER_UNSET = 5,
    /**
     * Skips the current assigned message returned by GUEST_MSG_WAIT.
     * Needed for telling the host service to not keep stale
     * host commands in the queue.
     */
    GUEST_MSG_SKIP = 10,
    /**
     * General reply to a host message. Only contains basic data
     * along with a simple payload.
     */
    GUEST_MSG_REPLY = 11,
    /**
     * General message for updating a pending progress for
     * a long task.
     */
    GUEST_MSG_PROGRESS_UPDATE = 12,
    /**
     * Guest reports back a guest session status.
     */
    GUEST_SESSION_NOTIFY = 20,
    /**
     * Guest wants to close a specific guest session.
     */
    GUEST_SESSION_CLOSE = 21,
    /**
     * Guests sends output from an executed process.
     */
    GUEST_EXEC_OUTPUT = 100,
    /**
     * Guest sends a status update of an executed process to the host.
     */
    GUEST_EXEC_STATUS = 101,
    /**
     * Guests sends an input status notification to the host.
     */
    GUEST_EXEC_INPUT_STATUS = 102,
    /**
     * Guest notifies the host about some I/O event. This can be
     * a stdout, stderr or a stdin event. The actual event only tells
     * how many data is available / can be sent without actually
     * transmitting the data.
     */
    GUEST_EXEC_IO_NOTIFY = 210,
    /**
     * Guest notifies the host about some directory event.
     */
    GUEST_DIR_NOTIFY = 230,
    /**
     * Guest notifies the host about some file event.
     */
    GUEST_FILE_NOTIFY = 240
};

/**
 * Guest session notification types.
 * @sa HGCMMsgSessionNotify.
 */
enum GUEST_SESSION_NOTIFYTYPE
{
    GUEST_SESSION_NOTIFYTYPE_UNDEFINED = 0,
    /** Something went wrong (see rc). */
    GUEST_SESSION_NOTIFYTYPE_ERROR = 1,
    /** Guest session has been started. */
    GUEST_SESSION_NOTIFYTYPE_STARTED = 11,
    /** Guest session terminated normally. */
    GUEST_SESSION_NOTIFYTYPE_TEN = 20,
    /** Guest session terminated via signal. */
    GUEST_SESSION_NOTIFYTYPE_TES = 30,
    /** Guest session terminated abnormally. */
    GUEST_SESSION_NOTIFYTYPE_TEA = 40,
    /** Guest session timed out and was killed. */
    GUEST_SESSION_NOTIFYTYPE_TOK = 50,
    /** Guest session timed out and was not killed successfully. */
    GUEST_SESSION_NOTIFYTYPE_TOA = 60,
    /** Service/OS is stopping, process was killed. */
    GUEST_SESSION_NOTIFYTYPE_DWN = 150
};

/**
 * Guest directory notification types.
 * @sa HGCMMsgDirNotify.
 */
enum GUEST_DIR_NOTIFYTYPE
{
    GUEST_DIR_NOTIFYTYPE_UNKNOWN = 0,
    /** Something went wrong (see rc). */
    GUEST_DIR_NOTIFYTYPE_ERROR = 1,
    /** Guest directory opened. */
    GUEST_DIR_NOTIFYTYPE_OPEN = 10,
    /** Guest directory closed. */
    GUEST_DIR_NOTIFYTYPE_CLOSE = 20,
    /** Information about an open guest directory. */
    GUEST_DIR_NOTIFYTYPE_INFO = 40,
    /** Guest directory created. */
    GUEST_DIR_NOTIFYTYPE_CREATE = 70,
    /** Guest directory deleted. */
    GUEST_DIR_NOTIFYTYPE_REMOVE = 80
};

/**
 * Guest file notification types.
 * @sa HGCMMsgFileNotify.
 */
enum GUEST_FILE_NOTIFYTYPE
{
    GUEST_FILE_NOTIFYTYPE_UNKNOWN = 0,
    GUEST_FILE_NOTIFYTYPE_ERROR = 1,
    GUEST_FILE_NOTIFYTYPE_OPEN = 10,
    GUEST_FILE_NOTIFYTYPE_CLOSE = 20,
    GUEST_FILE_NOTIFYTYPE_READ = 30,
    GUEST_FILE_NOTIFYTYPE_WRITE = 40,
    GUEST_FILE_NOTIFYTYPE_SEEK = 50,
    GUEST_FILE_NOTIFYTYPE_TELL = 60
};

/**
 * Guest file seeking types. Has to
 * match FileSeekType in Main.
 */
enum GUEST_FILE_SEEKTYPE
{
    GUEST_FILE_SEEKTYPE_BEGIN = 1,
    GUEST_FILE_SEEKTYPE_CURRENT = 4,
    GUEST_FILE_SEEKTYPE_END = 8
};

/*
 * HGCM parameter structures.
 */
#pragma pack (1)

/**
 * Waits for a host command to arrive. The structure then contains the
 * actual message type + required number of parameters needed to successfully
 * retrieve that host command (in a next round).
 */
typedef struct HGCMMsgCmdWaitFor
{
    VBGLIOCHGCMCALL hdr;
    /**
     * The returned command the host wants to
     * run on the guest.
     */
    HGCMFunctionParameter msg;       /* OUT uint32_t */
    /** Number of parameters the message needs. */
    HGCMFunctionParameter num_parms; /* OUT uint32_t */
} HGCMMsgCmdWaitFor;

/**
 * Asks the guest control host service to set a command
 * filter for this client. This filter will then only
 * deliver messages to the client which match the
 * wanted context ID (ranges).
 */
typedef struct HGCMMsgCmdFilterSet
{
    VBGLIOCHGCMCALL hdr;
    /** Value to filter for after filter mask
     *  was applied. */
    HGCMFunctionParameter value;         /* IN uint32_t */
    /** Mask to add to the current set filter. */
    HGCMFunctionParameter mask_add;      /* IN uint32_t */
    /** Mask to remove from the current set filter. */
    HGCMFunctionParameter mask_remove;   /* IN uint32_t */
    /** Filter flags; currently unused. */
    HGCMFunctionParameter flags;         /* IN uint32_t */
} HGCMMsgCmdFilterSet;

/**
 * Asks the guest control host service to disable
 * a previously set message filter again.
 */
typedef struct HGCMMsgCmdFilterUnset
{
    VBGLIOCHGCMCALL hdr;
    /** Unset flags; currently unused. */
    HGCMFunctionParameter flags;    /* IN uint32_t */
} HGCMMsgCmdFilterUnset;

/**
 * Asks the guest control host service to skip the
 * currently assigned host command returned by
 * VbglR3GuestCtrlMsgWaitFor().
 */
typedef struct HGCMMsgCmdSkip
{
    VBGLIOCHGCMCALL hdr;
    /** Skip flags; currently unused. */
    HGCMFunctionParameter flags;    /* IN uint32_t */
} HGCMMsgCmdSkip;

/**
 * Asks the guest control host service to cancel all pending (outstanding)
 * waits which were not processed yet. This is handy for a graceful shutdown.
 */
typedef struct HGCMMsgCancelPendingWaits
{
    VBGLIOCHGCMCALL hdr;
} HGCMMsgCancelPendingWaits;

typedef struct HGCMMsgCmdReply
{
    VBGLIOCHGCMCALL hdr;
    /** Context ID. */
    HGCMFunctionParameter context;
    /** Message type. */
    HGCMFunctionParameter type;
    /** IPRT result of overall operation. */
    HGCMFunctionParameter rc;
    /** Optional payload to this reply. */
    HGCMFunctionParameter payload;
} HGCMMsgCmdReply;

/**
 * Creates a guest session.
 */
typedef struct HGCMMsgSessionOpen
{
    VBGLIOCHGCMCALL hdr;
    /** Context ID. */
    HGCMFunctionParameter context;
    /** The guest control protocol version this
     *  session is about to use. */
    HGCMFunctionParameter protocol;
    /** The user name to run the guest session under. */
    HGCMFunctionParameter username;
    /** The user's password. */
    HGCMFunctionParameter password;
    /** The domain to run the guest session under. */
    HGCMFunctionParameter domain;
    /** Session creation flags. */
    HGCMFunctionParameter flags;
} HGCMMsgSessionOpen;

/**
 * Terminates (closes) a guest session.
 */
typedef struct HGCMMsgSessionClose
{
    VBGLIOCHGCMCALL hdr;
    /** Context ID. */
    HGCMFunctionParameter context;
    /** Session termination flags. */
    HGCMFunctionParameter flags;
} HGCMMsgSessionClose;

/**
 * Reports back a guest session's status.
 */
typedef struct HGCMMsgSessionNotify
{
    VBGLIOCHGCMCALL hdr;
    /** Context ID. */
    HGCMFunctionParameter context;
    /** Notification type. */
    HGCMFunctionParameter type;
    /** Notification result. */
    HGCMFunctionParameter result;
} HGCMMsgSessionNotify;

typedef struct HGCMMsgPathRename
{
    VBGLIOCHGCMCALL hdr;
    /** UInt32: Context ID. */
    HGCMFunctionParameter context;
    /** Source to rename. */
    HGCMFunctionParameter source;
    /** Destination to rename source to. */
    HGCMFunctionParameter dest;
    /** UInt32: Rename flags. */
    HGCMFunctionParameter flags;
} HGCMMsgPathRename;

typedef struct HGCMMsgPathUserDocuments
{
    VBGLIOCHGCMCALL hdr;
    /** UInt32: Context ID. */
    HGCMFunctionParameter context;
} HGCMMsgPathUserDocuments;

typedef struct HGCMMsgPathUserHome
{
    VBGLIOCHGCMCALL hdr;
    /** UInt32: Context ID. */
    HGCMFunctionParameter context;
} HGCMMsgPathUserHome;

/**
 * Executes a command inside the guest.
 */
typedef struct HGCMMsgProcExec
{
    VBGLIOCHGCMCALL hdr;
    /** Context ID. */
    HGCMFunctionParameter context;
    /** The command to execute on the guest. */
    HGCMFunctionParameter cmd;
    /** Execution flags (see IGuest::ProcessCreateFlag_*). */
    HGCMFunctionParameter flags;
    /** Number of arguments. */
    HGCMFunctionParameter num_args;
    /** The actual arguments. */
    HGCMFunctionParameter args;
    /** Number of environment value pairs. */
    HGCMFunctionParameter num_env;
    /** Size (in bytes) of environment block, including terminating zeros. */
    HGCMFunctionParameter cb_env;
    /** The actual environment block. */
    HGCMFunctionParameter env;
    union
    {
        struct
        {
            /** The user name to run the executed command under.
             *  Only for VBox < 4.3 hosts. */
            HGCMFunctionParameter username;
            /** The user's password.
             *  Only for VBox < 4.3 hosts. */
            HGCMFunctionParameter password;
            /** Timeout (in msec) which either specifies the
             *  overall lifetime of the process or how long it
             *  can take to bring the process up and running -
             *  (depends on the IGuest::ProcessCreateFlag_*). */
            HGCMFunctionParameter timeout;
        } v1;
        struct
        {
            /** Timeout (in ms) which either specifies the
             *  overall lifetime of the process or how long it
             *  can take to bring the process up and running -
             *  (depends on the IGuest::ProcessCreateFlag_*). */
            HGCMFunctionParameter timeout;
            /** Process priority. */
            HGCMFunctionParameter priority;
            /** Number of process affinity blocks. */
            HGCMFunctionParameter num_affinity;
            /** Pointer to process affinity blocks (uint64_t). */
            HGCMFunctionParameter affinity;
        } v2;
    } u;
} HGCMMsgProcExec;

/**
 * Sends input to a guest process via stdin.
 */
typedef struct HGCMMsgProcInput
{
    VBGLIOCHGCMCALL hdr;
    /** Context ID. */
    HGCMFunctionParameter context;
    /** The process ID (PID) to send the input to. */
    HGCMFunctionParameter pid;
    /** Input flags (see IGuest::ProcessInputFlag_*). */
    HGCMFunctionParameter flags;
    /** Data buffer. */
    HGCMFunctionParameter data;
    /** Actual size of data (in bytes). */
    HGCMFunctionParameter size;
} HGCMMsgProcInput;

/**
 * Retrieves ouptut from a previously executed process
 * from stdout/stderr.
 */
typedef struct HGCMMsgProcOutput
{
    VBGLIOCHGCMCALL hdr;
    /** Context ID. */
    HGCMFunctionParameter context;
    /** The process ID (PID). */
    HGCMFunctionParameter pid;
    /** The pipe handle ID (stdout/stderr). */
    HGCMFunctionParameter handle;
    /** Optional flags. */
    HGCMFunctionParameter flags;
    /** Data buffer. */
    HGCMFunctionParameter data;
} HGCMMsgProcOutput;

/**
 * Reports the current status of a guest process.
 */
typedef struct HGCMMsgProcStatus
{
    VBGLIOCHGCMCALL hdr;
    /** Context ID. */
    HGCMFunctionParameter context;
    /** The process ID (PID). */
    HGCMFunctionParameter pid;
    /** The process status. */
    HGCMFunctionParameter status;
    /** Optional flags (based on status). */
    HGCMFunctionParameter flags;
    /** Optional data buffer (not used atm). */
    HGCMFunctionParameter data;
} HGCMMsgProcStatus;

/**
 * Reports back the status of data written to a process.
 */
typedef struct HGCMMsgProcStatusInput
{
    VBGLIOCHGCMCALL hdr;
    /** Context ID. */
    HGCMFunctionParameter context;
    /** The process ID (PID). */
    HGCMFunctionParameter pid;
    /** Status of the operation. */
    HGCMFunctionParameter status;
    /** Optional flags. */
    HGCMFunctionParameter flags;
    /** Data written. */
    HGCMFunctionParameter written;
} HGCMMsgProcStatusInput;

/*
 * Guest control 2.0 messages.
 */

/**
 * Terminates a guest process.
 */
typedef struct HGCMMsgProcTerminate
{
    VBGLIOCHGCMCALL hdr;
    /** Context ID. */
    HGCMFunctionParameter context;
    /** The process ID (PID). */
    HGCMFunctionParameter pid;
} HGCMMsgProcTerminate;

/**
 * Waits for certain events to happen.
 */
typedef struct HGCMMsgProcWaitFor
{
    VBGLIOCHGCMCALL hdr;
    /** Context ID. */
    HGCMFunctionParameter context;
    /** The process ID (PID). */
    HGCMFunctionParameter pid;
    /** Wait (event) flags. */
    HGCMFunctionParameter flags;
    /** Timeout (in ms). */
    HGCMFunctionParameter timeout;
} HGCMMsgProcWaitFor;

typedef struct HGCMMsgDirRemove
{
    VBGLIOCHGCMCALL hdr;
    /** UInt32: Context ID. */
    HGCMFunctionParameter context;
    /** Directory to remove. */
    HGCMFunctionParameter path;
    /** UInt32: Removement flags. */
    HGCMFunctionParameter flags;
} HGCMMsgDirRemove;

/**
 * Opens a guest file.
 */
typedef struct HGCMMsgFileOpen
{
    VBGLIOCHGCMCALL hdr;
    /** UInt32: Context ID. */
    HGCMFunctionParameter context;
    /** File to open. */
    HGCMFunctionParameter filename;
    /** Open mode. */
    HGCMFunctionParameter openmode;
    /** Disposition mode. */
    HGCMFunctionParameter disposition;
    /** Sharing mode. */
    HGCMFunctionParameter sharing;
    /** UInt32: Creation mode. */
    HGCMFunctionParameter creationmode;
    /** UInt64: Initial offset. */
    HGCMFunctionParameter offset;
} HGCMMsgFileOpen;

/**
 * Closes a guest file.
 */
typedef struct HGCMMsgFileClose
{
    VBGLIOCHGCMCALL hdr;
    /** Context ID. */
    HGCMFunctionParameter context;
    /** File handle to close. */
    HGCMFunctionParameter handle;
} HGCMMsgFileClose;

/**
 * Reads from a guest file.
 */
typedef struct HGCMMsgFileRead
{
    VBGLIOCHGCMCALL hdr;
    /** Context ID. */
    HGCMFunctionParameter context;
    /** File handle to read from. */
    HGCMFunctionParameter handle;
    /** Size (in bytes) to read. */
    HGCMFunctionParameter size;
} HGCMMsgFileRead;

/**
 * Reads at a specified offset from a guest file.
 */
typedef struct HGCMMsgFileReadAt
{
    VBGLIOCHGCMCALL hdr;
    /** Context ID. */
    HGCMFunctionParameter context;
    /** File handle to read from. */
    HGCMFunctionParameter handle;
    /** Offset where to start reading from. */
    HGCMFunctionParameter offset;
    /** Actual size of data (in bytes). */
    HGCMFunctionParameter size;
} HGCMMsgFileReadAt;

/**
 * Writes to a guest file.
 */
typedef struct HGCMMsgFileWrite
{
    VBGLIOCHGCMCALL hdr;
    /** Context ID. */
    HGCMFunctionParameter context;
    /** File handle to write to. */
    HGCMFunctionParameter handle;
    /** Actual size of data (in bytes). */
    HGCMFunctionParameter size;
    /** Data buffer to write to the file. */
    HGCMFunctionParameter data;
} HGCMMsgFileWrite;

/**
 * Writes at a specified offset to a guest file.
 */
typedef struct HGCMMsgFileWriteAt
{
    VBGLIOCHGCMCALL hdr;
    /** Context ID. */
    HGCMFunctionParameter context;
    /** File handle to write to. */
    HGCMFunctionParameter handle;
    /** Offset where to start reading from. */
    HGCMFunctionParameter offset;
    /** Actual size of data (in bytes). */
    HGCMFunctionParameter size;
    /** Data buffer to write to the file. */
    HGCMFunctionParameter data;
} HGCMMsgFileWriteAt;

/**
 * Seeks the read/write position of a guest file.
 */
typedef struct HGCMMsgFileSeek
{
    VBGLIOCHGCMCALL hdr;
    /** Context ID. */
    HGCMFunctionParameter context;
    /** File handle to seek. */
    HGCMFunctionParameter handle;
    /** The seeking method. */
    HGCMFunctionParameter method;
    /** The seeking offset. */
    HGCMFunctionParameter offset;
} HGCMMsgFileSeek;

/**
 * Tells the current read/write position of a guest file.
 */
typedef struct HGCMMsgFileTell
{
    VBGLIOCHGCMCALL hdr;
    /** Context ID. */
    HGCMFunctionParameter context;
    /** File handle to get the current position for. */
    HGCMFunctionParameter handle;
} HGCMMsgFileTell;

/******************************************************************************
* HGCM replies from the guest. These are handled in Main's low-level HGCM     *
* callbacks and dispatched to the appropriate guest object.                   *
******************************************************************************/

typedef struct HGCMReplyFileNotify
{
    VBGLIOCHGCMCALL hdr;
    /** Context ID. */
    HGCMFunctionParameter context;
    /** Notification type. */
    HGCMFunctionParameter type;
    /** IPRT result of overall operation. */
    HGCMFunctionParameter rc;
    union
    {
        struct
        {
            /** Guest file handle. */
            HGCMFunctionParameter handle;
        } open;
        /** Note: Close does not have any additional data (yet). */
        struct
        {
            /** Actual data read (if any). */
            HGCMFunctionParameter data;
        } read;
        struct
        {
            /** How much data (in bytes) have been successfully written. */
            HGCMFunctionParameter written;
        } write;
        struct
        {
            HGCMFunctionParameter offset;
        } seek;
        struct
        {
            HGCMFunctionParameter offset;
        } tell;
    } u;
} HGCMReplyFileNotify;

typedef struct HGCMReplyDirNotify
{
    VBGLIOCHGCMCALL hdr;
    /** Context ID. */
    HGCMFunctionParameter context;
    /** Notification type. */
    HGCMFunctionParameter type;
    /** IPRT result of overall operation. */
    HGCMFunctionParameter rc;
    union
    {
        struct
        {
            /** Directory information. */
            HGCMFunctionParameter objInfo;
        } info;
        struct
        {
            /** Guest directory handle. */
            HGCMFunctionParameter handle;
        } open;
        struct
        {
            /** Current read directory entry. */
            HGCMFunctionParameter entry;
            /** Extended entry object information. Optional. */
            HGCMFunctionParameter objInfo;
        } read;
    } u;
} HGCMReplyDirNotify;

#pragma pack ()

/******************************************************************************
* Callback data structures.                                                   *
******************************************************************************/

/**
 * The guest control callback data header. Must come first
 * on each callback structure defined below this struct.
 */
typedef struct CALLBACKDATA_HEADER
{
    /** Context ID to identify callback data. This is
     *  and *must* be the very first parameter in this
     *  structure to still be backwards compatible. */
    uint32_t uContextID;
} CALLBACKDATA_HEADER, *PCALLBACKDATA_HEADER;

/*
 * These structures make up the actual low level HGCM callback data sent from
 * the guest back to the host.
 */

typedef struct CALLBACKDATA_CLIENT_DISCONNECTED
{
    /** Callback data header. */
    CALLBACKDATA_HEADER hdr;
} CALLBACKDATA_CLIENT_DISCONNECTED, *PCALLBACKDATA_CLIENT_DISCONNECTED;

typedef struct CALLBACKDATA_MSG_REPLY
{
    /** Callback data header. */
    CALLBACKDATA_HEADER hdr;
    /** Notification type. */
    uint32_t uType;
    /** Notification result. Note: int vs. uint32! */
    uint32_t rc;
    /** Pointer to optional payload. */
    void *pvPayload;
    /** Payload size (in bytes). */
    uint32_t cbPayload;
} CALLBACKDATA_MSG_REPLY, *PCALLBACKDATA_MSG_REPLY;

typedef struct CALLBACKDATA_SESSION_NOTIFY
{
    /** Callback data header. */
    CALLBACKDATA_HEADER hdr;
    /** Notification type. */
    uint32_t uType;
    /** Notification result. Note: int vs. uint32! */
    uint32_t uResult;
} CALLBACKDATA_SESSION_NOTIFY, *PCALLBACKDATA_SESSION_NOTIFY;

typedef struct CALLBACKDATA_PROC_STATUS
{
    /** Callback data header. */
    CALLBACKDATA_HEADER hdr;
    /** The process ID (PID). */
    uint32_t uPID;
    /** The process status. */
    uint32_t uStatus;
    /** Optional flags, varies, based on u32Status. */
    uint32_t uFlags;
    /** Optional data buffer (not used atm). */
    void *pvData;
    /** Size of optional data buffer (not used atm). */
    uint32_t cbData;
} CALLBACKDATA_PROC_STATUS, *PCALLBACKDATA_PROC_STATUS;

typedef struct CALLBACKDATA_PROC_OUTPUT
{
    /** Callback data header. */
    CALLBACKDATA_HEADER hdr;
    /** The process ID (PID). */
    uint32_t uPID;
    /** The handle ID (stdout/stderr). */
    uint32_t uHandle;
    /** Optional flags (not used atm). */
    uint32_t uFlags;
    /** Optional data buffer. */
    void *pvData;
    /** Size (in bytes) of optional data buffer. */
    uint32_t cbData;
} CALLBACKDATA_PROC_OUTPUT, *PCALLBACKDATA_PROC_OUTPUT;

typedef struct CALLBACKDATA_PROC_INPUT
{
    /** Callback data header. */
    CALLBACKDATA_HEADER hdr;
    /** The process ID (PID). */
    uint32_t uPID;
    /** Current input status. */
    uint32_t uStatus;
    /** Optional flags. */
    uint32_t uFlags;
    /** Size (in bytes) of processed input data. */
    uint32_t uProcessed;
} CALLBACKDATA_PROC_INPUT, *PCALLBACKDATA_PROC_INPUT;

/**
 * General guest directory notification callback.
 */
typedef struct CALLBACKDATA_DIR_NOTIFY
{
    /** Callback data header. */
    CALLBACKDATA_HEADER hdr;
    /** Notification type. */
    uint32_t uType;
    /** IPRT result of overall operation. */
    uint32_t rc;
    union
    {
        struct
        {
            /** Size (in bytes) of directory information. */
            uint32_t cbObjInfo;
            /** Pointer to directory information. */
            void *pvObjInfo;
        } info;
        struct
        {
            /** Guest directory handle. */
            uint32_t uHandle;
        } open;
        /** Note: Close does not have any additional data (yet). */
        struct
        {
            /** Size (in bytes) of directory entry information. */
            uint32_t cbEntry;
            /** Pointer to directory entry information. */
            void *pvEntry;
            /** Size (in bytes) of directory entry object information. */
            uint32_t cbObjInfo;
            /** Pointer to directory entry object information. */
            void *pvObjInfo;
        } read;
    } u;
} CALLBACKDATA_DIR_NOTIFY, *PCALLBACKDATA_DIR_NOTIFY;

/**
 * General guest file notification callback.
 */
typedef struct CALLBACKDATA_FILE_NOTIFY
{
    /** Callback data header. */
    CALLBACKDATA_HEADER hdr;
    /** Notification type. */
    uint32_t uType;
    /** IPRT result of overall operation. */
    uint32_t rc;
    union
    {
        struct
        {
            /** Guest file handle. */
            uint32_t uHandle;
        } open;
        /** Note: Close does not have any additional data (yet). */
        struct
        {
            /** How much data (in bytes) have been read. */
            uint32_t cbData;
            /** Actual data read (if any). */
            void *pvData;
        } read;
        struct
        {
            /** How much data (in bytes) have been successfully written. */
            uint32_t cbWritten;
        } write;
        struct
        {
            /** New file offset after successful seek. */
            uint64_t uOffActual;
        } seek;
        struct
        {
            /** New file offset after successful tell. */
            uint64_t uOffActual;
        } tell;
    } u;
} CALLBACKDATA_FILE_NOTIFY, *PCALLBACKDATA_FILE_NOTIFY;

} /* namespace guestControl */

#endif  /* !___VBox_HostService_GuestControlService_h */