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{
This file is part of the Free Component library.
Copyright (c) 2007 by Tomas Hajny, member of
the Free Pascal development team
OS/2 implementation of one-way IPC between 2 processes
See the file COPYING.FPC, included in this distribution,
for details about the copyright.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
**********************************************************************}
uses DosCalls, OS2Def;
ResourceString
SErrFailedToCreatePipe = 'Failed to create named pipe: %s';
SErrFailedToDisconnectPipe = 'Failed to disconnect named pipe: %s';
const
(* Constant used as key identifying a pipe connected to event semaphore. *)
(* 'FP' *)
PipeKey = $4650;
PipeBufSize = 256;
{ ---------------------------------------------------------------------
TPipeClientComm
---------------------------------------------------------------------}
Type
TPipeClientComm = Class(TIPCClientComm)
Private
FFileName: String;
FStream: TFileStream;
Public
Constructor Create(AOWner : TSimpleIPCClient); override;
Procedure Connect; override;
Procedure Disconnect; override;
Procedure SendMessage(MsgType : TMessageType; AStream : TStream); override;
Function ServerRunning : Boolean; override;
Property FileName : String Read FFileName;
Property Stream : TFileStream Read FStream;
end;
constructor TPipeClientComm.Create (AOWner: TSimpleIPCClient);
begin
inherited Create (AOWner);
FFileName:= '\PIPE\' + Owner.ServerID;
If (Owner.ServerInstance <> '') then
FFileName := FFileName + '.' + Owner.ServerInstance;
end;
procedure TPipeClientComm.Connect;
begin
try
FStream := TFileStream.Create (FFileName, fmOpenWrite);
finally
Owner.DoError (SErrServerNotActive, [Owner.ServerID]);
end;
end;
procedure TPipeClientComm.Disconnect;
begin
FreeAndNil (FStream);
end;
procedure TPipeClientComm.SendMessage (MsgType: TMessageType; AStream: TStream);
var
Hdr: TMsgHeader;
begin
Hdr.Version := MsgVersion;
Hdr.MsgType := MsgType;
Hdr.MsgLen := AStream.Size;
FStream.WriteBuffer (Hdr, SizeOf (Hdr));
FStream.CopyFrom (AStream, 0);
end;
function TPipeClientComm.ServerRunning: boolean;
begin
{$WARNING Fake TPipeClientComm.ServerRunning - no safe solution known}
Result := true;
end;
{ ---------------------------------------------------------------------
TPipeServerComm
---------------------------------------------------------------------}
type
TPipeServerComm = class (TIPCServerComm)
private
FFileName: string;
FStream: THandleStream;
EventSem: THandle;
SemName: string;
public
constructor Create (AOWner: TSimpleIPCServer); override;
procedure StartServer; override;
procedure StopServer; override;
function PeekMessage (TimeOut: integer): boolean; override;
procedure ReadMessage; override;
function GetInstanceID: string; override;
property FileName: string read FFileName;
property Stream: THandleStream read FStream;
end;
constructor TPipeServerComm.Create (AOWner: TSimpleIPCServer);
begin
inherited Create (AOWner);
FFileName := '\PIPE\' + Owner.ServerID;
SemName := '\SEM32\PIPE\' + Owner.ServerID;
If not Owner.Global then
FFileName := FFileName + '.' + IntToStr (GetProcessID);
end;
procedure TPipeServerComm.StartServer;
var
H: THandle;
begin
if not (Assigned (FStream)) then
if (DosCreateNPipe (PChar (FFileName), H, np_Access_Inbound,
np_ReadMode_Message or np_WriteMode_Message or 1, PipeBufSize,
PipeBufSize, 0) <> 0) or
(DosCreateEventSem (PChar (SemName), EventSem, 0, 0) <> 0) or
(DosSetNPipeSem (H, EventSem, PipeKey) <> 0) or
(DosConnectNPipe (H) <> 0) then
Owner.DoError (SErrFailedToCreatePipe, [FFileName]);
FStream := THandleStream.Create (H);
end;
procedure TPipeServerComm.StopServer;
begin
if (DosDisconnectNPipe (FStream.Handle) <> 0) or
(DosCloseEventSem (EventSem) <> 0) then
Owner.DoError (SErrFailedToDisconnectPipe, [FFileName]);
FreeAndNil (FStream);
end;
function TPipeServerComm.PeekMessage (TimeOut: integer): boolean;
var
PipeSemState: TPipeSemState;
begin
Result := (DosQueryNPipeSemState (EventSem, PipeSemState,
SizeOf (PipeSemState)) = 0) and (PipeSemState.Status = 1) and
(PipeSemState.Avail <> 0) and (PipeSemState.Key = PipeKey);
if not (Result) then
Result := (DosWaitEventSem (EventSem, TimeOut) = 0) and
(DosQueryNPipeSemState (EventSem, PipeSemState,
SizeOf (PipeSemState)) = 0) and (PipeSemState.Status = 1) and
(PipeSemState.Avail <> 0) and (PipeSemState.Key = PipeKey);
end;
procedure TPipeServerComm.ReadMessage;
var
Hdr: TMsgHeader;
begin
FStream.ReadBuffer (Hdr, SizeOf (Hdr));
Owner.FMsgType := Hdr.MsgType;
if Hdr.MsgLen > 0 then
begin
Owner.FMsgData.Seek (0, soFromBeginning);
Owner.FMsgData.CopyFrom (FStream, Hdr.MsgLen);
end
else
Owner.FMsgData.Size := 0;
end;
function TPipeServerComm.GetInstanceID: string;
begin
Result := IntToStr (GetProcessID);
end;
{ ---------------------------------------------------------------------
Set TSimpleIPCClient / TSimpleIPCServer defaults.
---------------------------------------------------------------------}
function TSimpleIPCServer.CommClass: TIPCServerCommClass;
begin
if (DefaultIPCServerClass <> nil) then
Result := DefaultIPCServerClass
else
Result := TPipeServerComm;
end;
function TSimpleIPCClient.CommClass: TIPCClientCommClass;
begin
if (DefaultIPCClientClass <> nil) then
Result := DefaultIPCClientClass
else
Result := TPipeClientComm;
end;
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