freepascal.compiler/rtl/netware/system.pp

{
    $Id$
    This file is part of the Free Pascal run time library.
    Copyright (c) 1999-2000 by the Free Pascal development team.

    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.

 **********************************************************************}
{ no stack check in system }
{$S-}
unit system;

interface

{$define StdErrToConsole}
{$define useLongNamespaceByDefault}
{$define autoHeapRelease}

{$ifdef SYSTEMDEBUG}
  {$define SYSTEMEXCEPTIONDEBUG}
{$endif SYSTEMDEBUG}

{$ifdef cpui386}
  {$define Set_i386_Exception_handler}
{$endif cpui386}

{ include system-independent routine headers }

{$I systemh.inc}

{Platform specific information}
const
 LineEnding = #13#10;
 LFNSupport : boolean = false;
 DirectorySeparator = '/';
 DriveSeparator = ':';
 PathSeparator = ';';
{ FileNameCaseSensitive is defined separately below!!! }
 maxExitCode = 255;


CONST
  { Default filehandles }
   UnusedHandle    : THandle = -1;
   StdInputHandle  : THandle = 0;
   StdOutputHandle : THandle = 0;
   StdErrorHandle  : THandle = 0;

   FileNameCaseSensitive : boolean = false;

   sLineBreak = LineEnding;
   DefaultTextLineBreakStyle : TTextLineBreakStyle = tlbsCRLF;

TYPE
   TNWCheckFunction = procedure (var code : longint);

VAR
   ArgC   : INTEGER;
   ArgV   : ppchar;
   NetwareCheckFunction    : TNWCheckFunction;
   NetwareMainThreadGroupID: longint;
   NetwareCodeStartAddress : dword;
   NetwareUnloadProc       : pointer = nil;  {like exitProc but for nlm unload only}

CONST
   envp   : ppchar = nil;   {dummy to make heaptrc happy}


procedure ConsolePrintf (FormatStr : PCHAR; Param : LONGINT); CDecl; external 'clib' name 'printf';
procedure ConsolePrintf (FormatStr : PCHAR; Param : pchar); CDecl; external 'clib' name 'printf';
procedure ConsolePrintf (FormatStr : PCHAR; P1,P2 : LONGINT);  CDecl; external 'clib' name 'printf';
procedure ConsolePrintf (FormatStr : PCHAR; P1,P2,P3 : LONGINT);  CDecl; external 'clib' name 'printf';
procedure ConsolePrintf (FormatStr : PCHAR);  CDecl; external 'clib' name 'printf';
// this gives internal compiler error 200404181
// procedure ConsolePrintf (FormatStr : PCHAR; Param : array of const); CDecl; EXTERNAL 'clib' name 'ConsolePrintf';

procedure __EnterDebugger; cdecl; external 'clib' name 'EnterDebugger';

type
  TSysCloseAllRemainingSemaphores = procedure;
  TSysReleaseThreadVars = procedure;
  TSysSetThreadDataAreaPtr = function (newPtr:pointer):pointer;

procedure NWSysSetThreadFunctions (crs:TSysCloseAllRemainingSemaphores;
                                   rtv:TSysReleaseThreadVars;
				   stdata:TSysSetThreadDataAreaPtr);

function NWGetCodeStart : pointer;  // needed for lineinfo

implementation
{ Indicate that stack checking is taken care by OS}
{$DEFINE NO_GENERIC_STACK_CHECK}

{ include system independent routines }
{$I system.inc}

//procedure __EnterDebugger; cdecl; external 'clib' name 'EnterDebugger';


procedure PASCALMAIN;external name 'PASCALMAIN';
procedure fpc_do_exit;external name 'FPC_DO_EXIT';


{*****************************************************************************
                         Startup
*****************************************************************************}

    function __GetBssStart : pointer; external name '__getBssStart';
    function __getUninitializedDataSize : longint; external name '__getUninitializedDataSize';
    //function __getDataStart : longint; external name '__getDataStart';
    function __GetTextStart : longint; external name '__getTextStart';

PROCEDURE nlm_main (_ArgC : LONGINT; _ArgV : ppchar); CDECL; [public,alias: '_nlm_main'];
BEGIN
  // Initialize BSS
  if __getUninitializedDataSize > 0 then
    fillchar (__getBssStart^,__getUninitializedDataSize,0);
  NetwareCodeStartAddress := __GetTextStart;
  ArgC := _ArgC;
  ArgV := _ArgV;
  fpc_threadvar_relocate_proc := nil;
  PASCALMAIN;
END;

function NWGetCodeStart : pointer;  // needed for lineinfo
begin
  NWGetCodeStart := pointer(NetwareCodeStartAddress);
end;


{*****************************************************************************
                         System Dependent Exit code
*****************************************************************************}

var SigTermHandlerActive : boolean;

Procedure system_exit;
begin
  if TerminatingThreadID <> 0 then
    if TerminatingThreadID <> ThreadId then
      if TerminatingThreadID <> _GetThreadID then
      begin
        {$ifdef DEBUG_MT}
        ConsolePrintf ('Terminating Thread %x because halt was called while Thread %x terminates nlm'#13#10,_GetThreadId,TerminatingThreadId);
        {$endif}
        ExitThread (EXIT_THREAD,0);
        // only for the case ExitThread fails
        while true do
          _ThreadSwitchWithDelay;
      end;
  if assigned (CloseAllRemainingSemaphores) then CloseAllRemainingSemaphores;
  if assigned (ReleaseThreadVars) then ReleaseThreadVars;

  {$ifdef autoHeapRelease}
  FreeSbrkMem;            { free memory allocated by heapmanager }
  {$endif}

  if not SigTermHandlerActive then
  begin
    if ExitCode <> 0 Then   { otherwise we dont see runtime-errors }
      _SetAutoScreenDestructionMode (false);

    _exit (ExitCode);
  end;
end;

{*****************************************************************************
                         Stack check code
*****************************************************************************}

const StackErr : boolean = false;

procedure int_stackcheck(stack_size:Cardinal);[public,alias:'FPC_STACKCHECK'];
{
  called when trying to get local stack if the compiler directive $S
  is set this function must preserve all registers

  With a 2048 byte safe area used to write to StdIo without crossing
  the stack boundary
}
begin
  if StackErr then exit;  // avoid recursive calls
  asm
    pusha
  end;
  stackerr := ( _stackavail < stack_size + 2048);
  asm
    popa
  end;
  if not StackErr then exit;
  StackErr := true;
  HandleError (202);
end;
{*****************************************************************************
                              ParamStr/Randomize
*****************************************************************************}

{ number of args }
function paramcount : longint;
begin
  paramcount := argc - 1;
end;

{ argument number l }
function paramstr(l : longint) : string;
begin
  if (l>=0) and (l+1<=argc) then
  begin
    paramstr:=strpas(argv[l]);
    if l = 0 then  // fix nlm path
    begin
      for l := 1 to length (paramstr) do
        if paramstr[l] = '\' then paramstr[l] := '/';
    end;
  end else
   paramstr:='';
end;

{ set randseed to a new pseudo random value }
procedure randomize;
begin
  randseed := _time (NIL);
end;



{*****************************************************************************
                             Thread Handling
*****************************************************************************}

procedure InitFPU;assembler;

  asm
     fninit
     fldcw   fpucw
  end;


{ if return-value is <> 0, netware shows the message
  Unload Anyway ?
  To Disable unload at all, SetNLMDontUnloadFlag can be used on
  Netware >= 4.0 }
function CheckFunction : longint; CDECL; [public,alias: 'FPC_NW_CHECKFUNCTION'];
var oldTG:longint;
    oldPtr: pointer;
begin
  if assigned (NetwareCheckFunction) then
  begin
    { this function is called without clib context, to allow clib
      calls, we set the thread group id before calling the
      user-function }
    oldTG := _SetThreadGroupID (NetwareMainThreadGroupID);
    { to allow use of threadvars, we simply set the threadvar-memory
      from the main thread }
    if assigned (SetThreadDataAreaPtr) then
      oldPtr := SetThreadDataAreaPtr (NIL);  { nil means main threadvars }
    result := 0;
    NetwareCheckFunction (result);
    if assigned (SetThreadDataAreaPtr) then
      SetThreadDataAreaPtr (oldPtr);

    _SetThreadGroupID (oldTG);
  end else
    result := 0;
end;



{$ifdef StdErrToConsole}
var ConsoleBuff : array [0..512] of char;

Function ConsoleWrite(Var F: TextRec): Integer;
var
  i : longint;
Begin
  if F.BufPos>0 then
  begin
     if F.BufPos>sizeof(ConsoleBuff)-1 then
       i:=sizeof(ConsoleBuff)-1
     else
       i:=F.BufPos;
     Move(F.BufPtr^,ConsoleBuff,i);
     ConsoleBuff[i] := #0;
     ConsolePrintf(@ConsoleBuff[0]);
  end;
  F.BufPos:=0;
  ConsoleWrite := 0;
End;


Function ConsoleClose(Var F: TextRec): Integer;
begin
  ConsoleClose:=0;
end;


Function ConsoleOpen(Var F: TextRec): Integer;
Begin
  TextRec(F).InOutFunc:=@ConsoleWrite;
  TextRec(F).FlushFunc:=@ConsoleWrite;
  TextRec(F).CloseFunc:=@ConsoleClose;
  ConsoleOpen:=0;
End;


procedure AssignStdErrConsole(Var T: Text);
begin
  Assign(T,'');
  TextRec(T).OpenFunc:=@ConsoleOpen;
  Rewrite(T);
end;
{$endif}


{ this will be called if the nlm is unloaded. It will NOT be
  called if the program exits i.e. with halt.
  Halt (or _exit) can not be called from this callback procedure }
procedure TermSigHandler (Sig:longint); CDecl;
var oldTG : longint;
    oldPtr: pointer;
    err   : longint;
    current_exit : procedure;
    ThreadName   : array [0..20] of char;
    HadExitProc  : boolean;
    Count        : longint;
begin

  oldTG := _SetThreadGroupID (NetwareMainThreadGroupID); { this is only needed for nw 3.11 }

  { _GetThreadDataAreaPtr will not be valid because the signal
    handler is called by netware with a differnt thread. To avoid
    problems in the exit routines, we set the data of the main thread
    here }
  if assigned (SetThreadDataAreaPtr) then
    oldPtr := SetThreadDataAreaPtr (NIL);  { nil means main thread }

  {this signal handler is called within the console command
   thread, the main thread is still running. Via NetwareUnloadProc
   running threads may terminate itself}
  TerminatingThreadID := _GetThreadID;
  {$ifdef DEBUG_MT}
  ConsolePrintf (#13'TermSigHandler Called, MainThread:%x, OurThread: %x'#13#10,ThreadId,TerminatingThreadId);
  if NetwareUnloadProc <> nil then
    ConsolePrintf (#13'Calling NetwareUnloadProcs'#13#10);
  {$endif}
  HadExitProc := false;
  {we need to finalize winock to release threads
   waiting on a blocking socket call. If that thread
   calls halt, we have to avoid that unit finalization
   is called by that thread because we are doing it
   here

   like the old exitProc, mainly to allow winsock to release threads
   blocking in a winsock calls }
  while NetwareUnloadProc<>nil Do
  Begin
    InOutRes:=0;
    current_exit:=tProcedure(NetwareUnloadProc);
    NetwareUnloadProc:=nil;
    current_exit();
    _ThreadSwitchWithDelay;
    hadExitProc := true;
  End;

  err := 0;
  if hadExitProc then
  begin  {give the main thread a little bit of time to terminate}
    count := 0;
    repeat
      err := _GetThreadName(ThreadID,ThreadName);
      if err = 0 then _Delay (200);
      inc(count);
    until (err <> 0) or (count > 100);  {about 20 seconds}
    {$ifdef DEBUG_MT}
    if err = 0 then
      ConsolePrintf (#13,'Main Thread not terminated'#13#10)
    else
      ConsolePrintf (#13'Main Thread has ended'#13#10);
    {$endif}
  end;

  if err = 0 then
  {$ifdef DEBUG_MT}
  begin
    err := _SuspendThread(ThreadId);
    ConsolePrintf (#13'SuspendThread(%x) returned %d'#13#10,ThreadId,err);
  end;
  {$else}
  _SuspendThread(ThreadId);
  {$endif}
  _ThreadSwitchWithDelay;

  {$ifdef DEBUG_MT}
  ConsolePrintf (#13'Calling do_exit'#13#10);
  {$endif}
  SigTermHandlerActive := true;  { to avoid that system_exit calls _exit }
  do_exit;                       { calls finalize units }
  if assigned (SetThreadDataAreaPtr) then
    SetThreadDataAreaPtr (oldPtr);
  _SetThreadGroupID (oldTG);
  {$ifdef DEBUG_MT}
  ConsolePrintf (#13'TermSigHandler: all done'#13#10);
  {$endif}
end;


procedure SysInitStdIO;
begin
{ Setup stdin, stdout and stderr }
  StdInputHandle := _fileno (LONGINT (_GetStdIn^));    // GetStd** returns **FILE
  StdOutputHandle:= _fileno (LONGINT (_GetStdOut^));
  StdErrorHandle := _fileno (LONGINT (_GetStdErr^));

  OpenStdIO(Input,fmInput,StdInputHandle);
  OpenStdIO(Output,fmOutput,StdOutputHandle);
  OpenStdIO(StdOut,fmOutput,StdOutputHandle);

  {$ifdef StdErrToConsole}
  AssignStdErrConsole(StdErr);
  AssignStdErrConsole(ErrOutput);
  {$else}
  OpenStdIO(StdErr,fmOutput,StdErrorHandle);
  OpenStdIO(ErrOutput,fmOutput,StdErrorHandle);
  {$endif}
end;

function GetProcessID: SizeUInt;
begin
 GetProcessID := SizeUInt (GetNlmHandle);
end;


{*****************************************************************************
                         SystemUnit Initialization
*****************************************************************************}

Begin
  StackBottom := SPtr - StackLength;
  SigTermHandlerActive := false;
  NetwareCheckFunction := nil;
  NetwareMainThreadGroupID := _GetThreadGroupID;

  _Signal (_SIGTERM, @TermSigHandler);

  {$ifdef useLongNamespaceByDefault}
  if _getenv ('FPC_DISABLE_LONG_NAMESPACE') = nil then
  begin
    if _SetCurrentNameSpace (NW_NS_LONG) <> 255 then
    begin
      if _SetTargetNamespace (NW_NS_LONG) <> 255 then
        LFNSupport := true
      else
        _SetCurrentNameSpace (NW_NS_DOS);
    end;
  end;
  {$endif useLongNamespaceByDefault}

{ Setup heap }
  InitHeap;
  SysInitExceptions;

{ Reset IO Error }
  InOutRes:=0;

  ThreadID := _GetThreadID;
  {$ifdef DEBUG_MT}
  ConsolePrintf (#13'Start system, ThreadID: %x'#13#10,ThreadID);
  {$endif}

  SysInitStdIO;

{Delphi Compatible}
  IsLibrary := FALSE;
  IsConsole := TRUE;
  ExitCode  := 0;
  InitSystemThreads;
{$ifdef HASVARIANT}
  initvariantmanager;
{$endif HASVARIANT}
{$ifdef HASWIDESTRING}
  initwidestringmanager;
{$endif HASWIDESTRING}
End.
{
  $Log$
  Revision 1.35  2005-02-06 16:57:18  peter
    * threads for go32v2,os,emx,netware

  Revision 1.34  2005/02/01 20:22:49  florian
    * improved widestring infrastructure manager

  Revision 1.33  2004/12/07 11:04:42  armin
  * fixed GetProcessId

  Revision 1.32  2004/12/05 14:36:37  hajny
    + GetProcessID added

  Revision 1.31  2004/11/25 12:32:08  armin
  * adapted to new compiler check for externals

  Revision 1.30  2004/11/04 09:32:31  peter
  ErrOutput added

  Revision 1.29  2004/10/25 18:11:49  armin
  * saveregisters no longer supported by compiler, for now save all registers in stackcheck

  Revision 1.28  2004/10/25 15:38:59  peter
    * compiler defined HEAP and HEAPSIZE removed

  Revision 1.27  2004/09/26 19:25:49  armin
  * exiting threads at nlm unload

  Revision 1.26  2004/09/17 18:29:07  armin
  * added NWGetCodeStart, needed for lineinfo

  Revision 1.25  2004/09/03 19:26:27  olle
    + added maxExitCode to all System.pp
    * constrained error code to be below maxExitCode in RunError et. al.

  Revision 1.24  2004/08/01 20:02:48  armin
  * changed dir separator from \ to /
  * long namespace by default
  * dos.exec implemented
  * getenv ('PATH') is now supported
  * changed FExpand to global version
  * fixed heaplist growth error
  * support SysOSFree
  * stackcheck was without saveregisters
  * fpc can compile itself on netware

  Revision 1.23  2004/07/30 15:05:25  armin
  make netware rtl compilable under 1.9.5

  Revision 1.22  2004/06/17 16:16:14  peter
    * New heapmanager that releases memory back to the OS, donated
      by Micha Nelissen

  Revision 1.21  2004/01/20 23:11:20  hajny
    * ExecuteProcess fixes, ProcessID and ThreadID added

  Revision 1.20  2003/10/25 23:43:59  hajny
    * THandle in sysutils common using System.THandle

  Revision 1.19  2003/10/17 22:12:02  olle
    * changed i386 to cpui386

  Revision 1.18  2003/09/27 11:52:35  peter
    * sbrk returns pointer

  Revision 1.17  2003/03/25 18:17:54  armin
  * support for fcl, support for linking without debug info
  * renamed winsock2 to winsock for win32 compatinility
  * new sockets unit for netware
  * changes for compiler warnings

  Revision 1.16  2003/02/15 19:12:54  armin
  * changes for new threadvar support

  Revision 1.15  2002/10/13 09:28:45  florian
    + call to initvariantmanager inserted

  Revision 1.14  2002/09/07 16:01:21  peter
    * old logs removed and tabs fixed

  Revision 1.13  2002/07/01 16:29:05  peter
    * sLineBreak changed to normal constant like Kylix

  Revision 1.12  2002/04/15 18:47:34  carl
  + reinstate novell stack checking

  Revision 1.11  2002/04/12 17:40:11  carl
  + generic stack checking

  Revision 1.10  2002/04/01 15:20:08  armin
  + unload module no longer shows: Module did not release...
  + check-function will no longer be removed when smartlink is on

  Revision 1.9  2002/04/01 10:47:31  armin
  makefile.fpc for netware
  stderr to netware console
  free all memory (threadvars and heap) to avoid error message while unloading nlm

  Revision 1.8  2002/03/30 09:09:47  armin
  + support check-function for netware

  Revision 1.7  2002/03/17 17:57:33  armin
  + threads and winsock2 implemented

}