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605 lines
15 KiB
ObjectPascal
605 lines
15 KiB
ObjectPascal
{
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****************************************************************************
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This file is part of the Free Pascal run time library.
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Copyright (c) 1999-2002 by Free Pascal development team
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Free Pascal - EMX runtime library
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See the file COPYING.FPC, included in this distribution,
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for details about the copyright.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
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****************************************************************************}
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unit System;
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interface
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{Link the startup code.}
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{$l prt1.o}
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{$I systemh.inc}
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const
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LineEnding = #13#10;
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{ LFNSupport is defined separately below!!! }
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DirectorySeparator = '\';
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DriveSeparator = ':';
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ExtensionSeparator = '.';
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PathSeparator = ';';
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AllowDirectorySeparators : set of char = ['\','/'];
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AllowDriveSeparators : set of char = [':'];
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{ FileNameCaseSensitive and FileNameCasePreserving are defined separately below!!! }
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maxExitCode = 255;
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MaxPathLen = 256;
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AllFilesMask = '*';
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type Tos=(osDOS,osOS2,osDPMI);
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var os_mode:Tos;
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first_meg:pointer;
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type TByteArray = array [0..$ffff] of byte;
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PByteArray = ^TByteArray;
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TSysThreadIB = record
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TID,
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Priority,
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Version: cardinal;
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MCCount,
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MCForceFlag: word;
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end;
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PSysThreadIB = ^TSysThreadIB;
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TThreadInfoBlock = record
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PExChain,
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Stack,
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StackLimit: pointer;
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TIB2: PSysThreadIB;
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Version,
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Ordinal: cardinal;
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end;
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PThreadInfoBlock = ^TThreadInfoBlock;
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PPThreadInfoBlock = ^PThreadInfoBlock;
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TProcessInfoBlock = record
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PID,
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ParentPid,
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Handle: cardinal;
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Cmd,
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Env: PByteArray;
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Status,
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ProcType: cardinal;
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end;
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PProcessInfoBlock = ^TProcessInfoBlock;
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PPProcessInfoBlock = ^PProcessInfoBlock;
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const UnusedHandle=-1;
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StdInputHandle=0;
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StdOutputHandle=1;
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StdErrorHandle=2;
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LFNSupport: boolean = true;
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FileNameCaseSensitive: boolean = false;
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FileNameCasePreserving: boolean = false;
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CtrlZMarksEOF: boolean = true; (* #26 is considered as end of file *)
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sLineBreak = LineEnding;
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DefaultTextLineBreakStyle : TTextLineBreakStyle = tlbsCRLF;
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var
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{ C-compatible arguments and environment }
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argc : longint;external name '_argc';
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argv : ppchar;external name '_argv';
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envp : ppchar;external name '_environ';
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EnvC: cardinal; external name '_envc';
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(* Pointer to the block of environment variables - used e.g. in unit Dos. *)
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Environment: PChar;
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var
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(* Type / run mode of the current process: *)
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(* 0 .. full screen OS/2 session *)
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(* 1 .. DOS session *)
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(* 2 .. VIO windowable OS/2 session *)
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(* 3 .. Presentation Manager OS/2 session *)
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(* 4 .. detached (background) OS/2 process *)
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ApplicationType: cardinal;
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procedure SetDefaultOS2FileType (FType: ShortString);
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procedure SetDefaultOS2Creator (Creator: ShortString);
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implementation
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{$I system.inc}
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var
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heap_base: pointer; external name '__heap_base';
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heap_brk: pointer; external name '__heap_brk';
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heap_end: pointer; external name '__heap_end';
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(* Maximum heap size - only used if heap is allocated as continuous block. *)
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{$IFDEF CONTHEAP}
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BrkLimit: cardinal;
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{$ENDIF CONTHEAP}
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{****************************************************************************
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Miscellaneous related routines.
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****************************************************************************}
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{$asmmode intel}
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procedure system_exit; assembler;
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asm
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mov ah, 04ch
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mov al, byte ptr exitcode
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call syscall
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end {['EAX']};
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{$ASMMODE ATT}
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function paramcount:longint;assembler;
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asm
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movl argc,%eax
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decl %eax
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end {['EAX']};
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function args:pointer;assembler;
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asm
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movl argv,%eax
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end {['EAX']};
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function paramstr(l:longint):string;
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var p:^Pchar;
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begin
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{ There seems to be a problem with EMX for DOS when trying to }
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{ access paramstr(0), and to avoid problems between DOS and }
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{ OS/2 they have been separated. }
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if os_Mode = OsOs2 then
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begin
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if L = 0 then
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begin
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GetMem (P, 260);
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p[0] := #0; { in case of error, initialize to empty string }
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{$ASMMODE INTEL}
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asm
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mov edx, P
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mov ecx, 260
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mov eax, 7F33h
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call syscall { error handle already with empty string }
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end ['eax', 'ecx', 'edx'];
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ParamStr := StrPas (PChar (P));
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FreeMem (P, 260);
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end
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else
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if (l>0) and (l<=paramcount) then
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begin
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p:=args;
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paramstr:=strpas(p[l]);
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end
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else paramstr:='';
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end
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else
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begin
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p:=args;
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paramstr:=strpas(p[l]);
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end;
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end;
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procedure randomize; assembler;
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asm
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mov ah, 2Ch
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call syscall
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mov word ptr [randseed], cx
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mov word ptr [randseed + 2], dx
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end {['eax', 'ecx', 'edx']};
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{$ASMMODE ATT}
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{*****************************************************************************
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System unit initialization.
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****************************************************************************}
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{****************************************************************************
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Error Message writing using messageboxes
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****************************************************************************}
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type
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TWinMessageBox = function (Parent, Owner: cardinal;
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BoxText, BoxTitle: PChar; Identity, Style: cardinal): cardinal; cdecl;
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TWinInitialize = function (Options: cardinal): cardinal; cdecl;
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TWinCreateMsgQueue = function (Handle: cardinal; cmsg: longint): cardinal;
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cdecl;
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const
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ErrorBufferLength = 1024;
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mb_OK = $0000;
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mb_Error = $0040;
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mb_Moveable = $4000;
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MBStyle = mb_OK or mb_Error or mb_Moveable;
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WinInitialize: TWinInitialize = nil;
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WinCreateMsgQueue: TWinCreateMsgQueue = nil;
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WinMessageBox: TWinMessageBox = nil;
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EnvSize: cardinal = 0;
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var
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ErrorBuf: array [0..ErrorBufferLength] of char;
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ErrorLen: longint;
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PMWinHandle: cardinal;
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function ErrorWrite (var F: TextRec): integer;
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{
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An error message should always end with #13#10#13#10
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}
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var
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P: PChar;
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I: longint;
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begin
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if F.BufPos > 0 then
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begin
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if F.BufPos + ErrorLen > ErrorBufferLength then
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I := ErrorBufferLength - ErrorLen
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else
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I := F.BufPos;
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Move (F.BufPtr^, ErrorBuf [ErrorLen], I);
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Inc (ErrorLen, I);
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ErrorBuf [ErrorLen] := #0;
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end;
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if ErrorLen > 3 then
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begin
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P := @ErrorBuf [ErrorLen];
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for I := 1 to 4 do
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begin
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Dec (P);
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if not (P^ in [#10, #13]) then
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break;
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end;
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end;
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if ErrorLen = ErrorBufferLength then
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I := 4;
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if (I = 4) then
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begin
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WinMessageBox (0, 0, @ErrorBuf, PChar ('Error'), 0, MBStyle);
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ErrorLen := 0;
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end;
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F.BufPos := 0;
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ErrorWrite := 0;
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end;
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function ErrorClose (var F: TextRec): integer;
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begin
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if ErrorLen > 0 then
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begin
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WinMessageBox (0, 0, @ErrorBuf, PChar ('Error'), 0, MBStyle);
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ErrorLen := 0;
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end;
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ErrorLen := 0;
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ErrorClose := 0;
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end;
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function ErrorOpen (var F: TextRec): integer;
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begin
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TextRec(F).InOutFunc := @ErrorWrite;
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TextRec(F).FlushFunc := @ErrorWrite;
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TextRec(F).CloseFunc := @ErrorClose;
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ErrorOpen := 0;
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end;
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procedure AssignError (var T: Text);
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begin
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Assign (T, '');
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TextRec (T).OpenFunc := @ErrorOpen;
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Rewrite (T);
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end;
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procedure DosEnvInit;
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var
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Q: PPChar;
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I: cardinal;
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begin
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(* It's a hack, in fact - DOS stores the environment the same way as OS/2 does,
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but I don't know how to find Program Segment Prefix and thus the environment
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address under EMX, so I'm recreating this structure using EnvP pointer. *)
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{$ASMMODE INTEL}
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asm
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cld
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mov ecx, EnvC
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mov esi, EnvP
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xor eax, eax
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xor edx, edx
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@L1:
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xchg eax, edx
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push ecx
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mov ecx, -1
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mov edi, [esi]
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repne
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scasb
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neg ecx
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dec ecx
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xchg eax, edx
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add eax, ecx
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pop ecx
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dec ecx
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jecxz @Stop
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inc esi
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inc esi
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inc esi
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inc esi
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jmp @L1
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@Stop:
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inc eax
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mov EnvSize, eax
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end ['eax','ecx','edx','esi','edi'];
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Environment := GetMem (EnvSize);
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asm
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cld
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mov ecx, EnvC
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mov edx, EnvP
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mov edi, Environment
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@L2:
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mov esi, [edx]
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@Copying:
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lodsb
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stosb
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or al, al
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jnz @Copying
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dec ecx
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jecxz @Stop2
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inc edx
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inc edx
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inc edx
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inc edx
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jmp @L2
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@Stop2:
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stosb
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end ['eax','ecx','edx','esi','edi'];
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end;
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procedure SysInitStdIO;
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begin
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{ Setup stdin, stdout and stderr, for GUI apps redirect stderr,stdout to be
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displayed in a messagebox }
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(*
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StdInputHandle := longint(GetStdHandle(cardinal(STD_INPUT_HANDLE)));
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StdOutputHandle := longint(GetStdHandle(cardinal(STD_OUTPUT_HANDLE)));
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StdErrorHandle := longint(GetStdHandle(cardinal(STD_ERROR_HANDLE)));
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if not IsConsole then
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begin
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if (DosLoadModule (nil, 0, 'PMWIN', PMWinHandle) = 0) and
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(DosQueryProcAddr (PMWinHandle, 789, nil, pointer (WinMessageBox)) = 0)
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and
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(DosQueryProcAddr (PMWinHandle, 763, nil, pointer (WinInitialize)) = 0)
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and
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(DosQueryProcAddr (PMWinHandle, 716, nil, pointer (WinCreateMsgQueue))
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= 0)
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then
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begin
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WinInitialize (0);
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WinCreateMsgQueue (0, 0);
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end
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else
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HandleError (2);
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AssignError (StdErr);
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AssignError (StdOut);
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Assign (Output, '');
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Assign (Input, '');
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end
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else
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begin
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*)
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OpenStdIO (Input, fmInput, StdInputHandle);
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OpenStdIO (Output, fmOutput, StdOutputHandle);
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OpenStdIO (ErrOutput, fmOutput, StdErrorHandle);
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OpenStdIO (StdOut, fmOutput, StdOutputHandle);
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OpenStdIO (StdErr, fmOutput, StdErrorHandle);
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(*
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end;
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*)
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end;
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threadvar
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DefaultCreator: ShortString;
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DefaultFileType: ShortString;
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procedure SetDefaultOS2FileType (FType: ShortString);
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begin
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{$WARNING Not implemented yet!}
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DefaultFileType := FType;
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end;
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procedure SetDefaultOS2Creator (Creator: ShortString);
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begin
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{$WARNING Not implemented yet!}
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DefaultCreator := Creator;
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end;
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function GetFileHandleCount: longint;
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var L1: longint;
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L2: cardinal;
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begin
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L1 := 0; (* Don't change the amount, just check. *)
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if DosSetRelMaxFH (L1, L2) <> 0 then GetFileHandleCount := 50
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else GetFileHandleCount := L2;
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end;
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function CheckInitialStkLen (StkLen: SizeUInt): SizeUInt;
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begin
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CheckInitialStkLen := StkLen;
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end;
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var TIB: PThreadInfoBlock;
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PIB: PProcessInfoBlock;
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const
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FatalHeap: array [0..33] of char = 'FATAL: Cannot initialize heap!!'#13#10'$';
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begin
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{Determine the operating system we are running on.}
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{$ASMMODE INTEL}
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asm
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push ebx
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mov os_mode, 0
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mov eax, 7F0Ah
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call syscall
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test bx, 512 {Bit 9 is OS/2 flag.}
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setne byte ptr os_mode
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test bx, 4096
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jz @noRSX
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mov os_mode, 2
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@noRSX:
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{Enable the brk area by initializing it with the initial heap size.}
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mov eax, 7F01h
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mov edx, heap_brk
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add edx, heap_base
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call syscall
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cmp eax, -1
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jnz @heapok
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lea edx, FatalHeap
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mov eax, 900h
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call syscall
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pop ebx
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push dword 204
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call HandleError
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@heapok:
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{$IFDEF CONTHEAP}
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{ Find out brk limit }
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mov eax, 7F02h
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mov ecx, 3
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call syscall
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jcxz @heaplimitknown
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mov eax, 0
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@heaplimitknown:
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mov BrkLimit, eax
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{$ELSE CONTHEAP}
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{ Change sbrk behaviour to allocate arbitrary (non-contiguous) memory blocks }
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mov eax, 7F0Fh
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mov ecx, 0Ch
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mov edx, 8
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call syscall
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{$ENDIF CONTHEAP}
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pop ebx
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end ['eax', 'ecx', 'edx'];
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{ in OS/2 this will always be nil, but in DOS mode }
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{ this can be changed. }
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first_meg := nil;
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{Now request, if we are running under DOS,
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read-access to the first meg. of memory.}
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if os_mode in [osDOS,osDPMI] then
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asm
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push ebx
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mov eax, 7F13h
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xor ebx, ebx
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mov ecx, 0FFFh
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xor edx, edx
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call syscall
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jc @endmem
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mov first_meg, eax
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@endmem:
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pop ebx
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end ['eax', 'ecx', 'edx']
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else
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begin
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(* Initialize the amount of file handles *)
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FileHandleCount := GetFileHandleCount;
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end;
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{At 0.9.2, case for enumeration does not work.}
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case os_mode of
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osDOS:
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begin
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stackbottom:=pointer(heap_brk); {In DOS mode, heap_brk is
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also the stack bottom.}
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StackTop := StackBottom + InitialStkLen;
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{$WARNING To be checked/corrected!}
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ApplicationType := 1; (* Running under DOS. *)
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IsConsole := true;
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asm
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mov ax, 7F05h
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call syscall
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mov ProcessID, eax
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end ['eax'];
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ThreadID := 1;
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end;
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osOS2:
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begin
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DosGetInfoBlocks (@TIB, @PIB);
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StackBottom := pointer (TIB^.Stack);
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StackTop := TIB^.StackLimit;
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Environment := pointer (PIB^.Env);
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ApplicationType := PIB^.ProcType;
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ProcessID := PIB^.PID;
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ThreadID := TIB^.TIB2^.TID;
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IsConsole := ApplicationType <> 3;
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FileNameCasePreserving := true;
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end;
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osDPMI:
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begin
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stackbottom:=nil; {Not sure how to get it, but seems to be
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always zero.}
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StackTop := StackBottom + InitialStkLen;
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{$WARNING To be checked/corrected!}
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ApplicationType := 1; (* Running under DOS. *)
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IsConsole := true;
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ThreadID := 1;
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end;
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end;
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exitproc:=nil;
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StackLength := CheckInitialStkLen (InitialStkLen);
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{Initialize the heap.}
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initheap;
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{ ... and exceptions }
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SysInitExceptions;
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{$ifdef HASWIDESTRING}
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InitUnicodeStringManager;
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{$endif HASWIDESTRING}
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{ ... and I/O }
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SysInitStdIO;
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{ no I/O-Error }
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inoutres:=0;
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InitSystemThreads;
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InitVariantManager;
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if os_Mode in [osDOS,osDPMI] then
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DosEnvInit;
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{$IFDEF DUMPGROW}
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{$IFDEF CONTHEAP}
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WriteLn ('Initial brk size is ', GetHeapSize);
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WriteLn ('Brk limit is ', BrkLimit);
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{$ENDIF CONTHEAP}
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|
{$ENDIF DUMPGROW}
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end.
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