Re: [fpc-pascal] Sharing memory between applications

[Carsten Bager]

> I need to share memory between applications and wanted to know if FPC 
> has this implemented. Today I use the windows "CreateFileMapping" 
> function, but this is windows specific.




Here is a parcel of a program where I use sheared memory on Linux

Regards

Carsten


-------------------------

uses
   spstatus;

begin
  if not InitShaerdMemory('./udp2ser4') then
  begin
    WriteLn('Error at InitShaerdMemory');
    exit;
  end;
  spstatus.TcpSerData^.udp2ser2_terminate:=false;
end.




-----------------------------

Unit spstatus;

Interface

function InitShaerdMemory(filename:shortstring):boolean;

Type
  TcpSerData_typ=record
    Sio_Tcp_used:boolean;
    udp2ser2_terminate:boolean;
  end;


Var
  TcpSerData:^TcpSerData_typ;



Implementation

Uses ipc,BaseUnix;

function InitShaerdMemory(filename:shortstring):boolean;
var
  id,key:cInt;
  pc:array[0..255] of char;
Begin
  InitShaerdMemory:=false;
  fillchar(pc,256,0);
  pc:=filename;
  key:=ftok(pc,1);
  if key=-1 then
    exit;
  id:=shmget(key,sizeof(TcpSerData_typ),IPC_CREAT);
  if id=-1 then
    exit;
  TcpSerData:=shmat(id,nil,IPC_CREAT);
  if LongInt(TcpSerData)=-1 then
    exit;
  InitShaerdMemory:=true;
end;

End.

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