You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
143 lines
3.9 KiB
143 lines
3.9 KiB
/*++
|
|
|
|
Copyright (c) 1991 Microsoft Corporation
|
|
|
|
Module Name:
|
|
|
|
vrmslot.h
|
|
|
|
Abstract:
|
|
|
|
Prototypes, definitions and structures for VdmRedir mailslot handlers
|
|
|
|
Author:
|
|
|
|
Richard L Firth (rfirth) 16-Sep-1991
|
|
|
|
Revision History:
|
|
|
|
16-Sep-1991 rfirth
|
|
Created
|
|
|
|
--*/
|
|
|
|
|
|
|
|
//
|
|
// VDM Mailslot support routines. Prototypes
|
|
//
|
|
|
|
VOID
|
|
VrDeleteMailslot(
|
|
VOID
|
|
);
|
|
|
|
VOID
|
|
VrGetMailslotInfo(
|
|
VOID
|
|
);
|
|
|
|
VOID
|
|
VrMakeMailslot(
|
|
VOID
|
|
);
|
|
|
|
VOID
|
|
VrPeekMailslot(
|
|
VOID
|
|
);
|
|
|
|
VOID
|
|
VrReadMailslot(
|
|
VOID
|
|
);
|
|
|
|
VOID
|
|
VrWriteMailslot(
|
|
VOID
|
|
);
|
|
|
|
VOID
|
|
VrTerminateMailslots(
|
|
IN WORD DosPdb
|
|
);
|
|
|
|
|
|
|
|
//
|
|
// typedefs
|
|
//
|
|
|
|
//
|
|
// SELECTOR - in the absence of a standard SELECTOR type, 16-bit selector,
|
|
// doubles as SEGMENT (as in ADDRESS16)
|
|
//
|
|
|
|
typedef unsigned short SELECTOR;
|
|
|
|
//
|
|
// ADDRESS16 - an Intel architecture-specific 16:16 address, consisting of a
|
|
// 16-bit offset in the low word and a 16-bit segment (real mode) or selector
|
|
// (protect mode) in the high word. Both elements are little-endian
|
|
// Again, this exists in absence of Intel-specific DWORD structure which has
|
|
// correct endian-ness and views address as composed of two parts
|
|
//
|
|
|
|
typedef struct {
|
|
unsigned short Offset;
|
|
SELECTOR Selector;
|
|
} ADDRESS16;
|
|
|
|
|
|
|
|
//
|
|
// structures
|
|
//
|
|
|
|
//
|
|
// VR_MAILSLOT_INFO - the Dos mailslot subsystem needs some info which we do
|
|
// not keep, so we put it in this structure. The structure is linked into a
|
|
// list of active mailslot structures for every successful CreateMailslot
|
|
// call. The extra info we need is:
|
|
//
|
|
// DosPdb - the PDB (or PSP) of the Dos application. Used for
|
|
// consistency checks and removing mailslots when the
|
|
// app dies
|
|
// Handle16 - the handle returned to the Dos app. We have to invent
|
|
// this
|
|
// BufferAddress - the Dos app tells us where its buffer is then wants
|
|
// us to confirm the address in a DosMailslotInfo call
|
|
// Selector - the Dos app needs a protect mode selector when
|
|
// running under Windows 3.0 enhanced mode
|
|
// MessageSize - maximum message size which can be read. Not the same
|
|
// thing as mailslot size
|
|
//
|
|
// We also need some information for our own internal wrangling:
|
|
//
|
|
// NameLength - the length of the significant part of the mailslot
|
|
// name (after \MAILSLOT\). We compare this before
|
|
// doing a strcmp() on names
|
|
// Name - the significant part of the mailslot name. When a
|
|
// mailslot is opened, we store the name after \MAILSLOT\
|
|
// because DosMailslotWrite uses the symbolic name, even
|
|
// when writing locally; we need a handle, so we have
|
|
// to map the name to open mailslot handle.
|
|
//
|
|
// This structure is allocated from the heap and the Name field will actually
|
|
// be large enough to hold the entire string. I put Name[2] because the Mips
|
|
// compiler doesn't know about Name[] (Microsoft C compiler extension). 2 at
|
|
// least keeps things even. Maybe it should be 4. Maybe it doesn't matter
|
|
//
|
|
|
|
typedef struct _VR_MAILSLOT_INFO *PVR_MAILSLOT_INFO;
|
|
typedef struct _VR_MAILSLOT_INFO {
|
|
PVR_MAILSLOT_INFO Next; // linked list
|
|
WORD DosPdb; // for consistency etc
|
|
WORD Handle16; // Dos handle
|
|
HANDLE Handle32; // Win32 handle (proper)
|
|
ADDRESS16 BufferAddress; // Dos app's message buffer
|
|
SELECTOR Selector; // Win 3's buffer selector
|
|
DWORD MessageSize; // max. message size
|
|
DWORD NameLength; // length of name following:
|
|
CHAR Name[2]; // of mailslot, (after \\.\MAILSLOT\)
|
|
} VR_MAILSLOT_INFO;
|