Freelog 22/freelog 22.iso/Prog/Djgpp/GPC2952B.ZIP/info/gpc.i8

GNU Info File | 2001-02-09 | 88.3 KB | 1,987 lines

This is gpc.info, produced by makeinfo version 4.0 from gpc.texi.

INFO-DIR-SECTION GNU programming tools
START-INFO-DIR-ENTRY
* GPC: (gpc).                   The GNU Pascal Compiler.
END-INFO-DIR-ENTRY
INFO-DIR-SECTION Individual utilities
START-INFO-DIR-ENTRY
* GPC: (gpc)Invoking GPC.       The GNU Pascal Compiler.
END-INFO-DIR-ENTRY

   This file documents the GNU Pascal Compiler.

   Copyright (C) 1988, 1996-2001 Free Software Foundation, Inc.

   Permission is granted to make and distribute verbatim copies of this
manual provided the copyright notice and this permission notice are
preserved on all copies.

   Permission is granted to copy and distribute modified versions of
this manual under the conditions for verbatim copying, provided also
that the sections entitled "GNU General Public License", "The GNU
Project", "The GNU Manifesto" and "Funding for Free Software" are
included exactly as in the original, and provided that the entire
resulting derived work is distributed under the terms of a permission
notice identical to this one.

   Permission is granted to copy and distribute translations of this
manual into another language, under the above conditions for modified
versions, except that the sections entitled "GNU General Public
License", "The GNU Project", "The GNU Manifesto" and "Funding for Free
Software" and this permission notice, may be included in translations
approved by the Free Software Foundation instead of in the original
English.


File: gpc.info,  Node: Run Time System,  Next: GPC Units,  Prev: Notes for Debugging,  Up: Programming

Pascal declarations for GPC's Run Time System
=============================================

   Below is a Pascal source of the declarations in GPC's Run Time
System (RTS). A file `gpc.pas' with the same contents is included in
the GPC distribution in a `units' subdirectory of the directory
containing `libgcc.a'. (To find out the correct directory for your
installation, type `gpc --print-file-name=units' on the command line.)

     {
     Pascal declarations of the GPC Run Time System that are visible to
     each program.

     This unit contains Pascal declarations of many RTS routines which
     are not built into the compiler and can be called from programs.
     Don't copy the declarations from this unit into your programs, but
     rather include this unit with a `uses' statement. The reason is that
     the internal declarations, e.g. the `asmnames', may change, and this
     unit will be changed accordingly. @@In the future, this unit might
     be included into every program automatically, so there will be no
     need for a `uses' statement to make the declarations here available.

     Note about `protected var' parameters:
     Since const parameters in GPC may be passed by value *or* by
     reference internally, possibly depending on the system, `const foo*'
     parameters to C functions *cannot* reliably declared as `const' in
     Pascal. However, Extended Pascal's `protected var' can be used since
     this guarantees passing by reference.

     Copyright (C) 1998-2001 Free Software Foundation, Inc.

     Author: Frank Heckenbach <[e-mail]>

     This file is part of GNU Pascal.

     GNU Pascal is free software; you can redistribute it and/or modify
     it under the terms of the GNU General Public License as published by
     the Free Software Foundation; either version 2, or (at your option)
     any later version.

     GNU Pascal 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. See the
     GNU General Public License for more details.

     You should have received a copy of the GNU General Public License
     along with GNU Pascal; see the file COPYING. If not, write to the
     Free Software Foundation, 59 Temple Place - Suite 330, Boston, MA
     02111-1307, USA.

     As a special exception, if you link this file with files compiled
     with a GNU compiler to produce an executable, this does not cause
     the resulting executable to be covered by the GNU General Public
     License. This exception does not however invalidate any other
     reasons why the executable file might be covered by the GNU General
     Public License.
     }

     {$gnu-pascal,B-,I-}

     module GPC interface;

     export
       GPC = all;
       GPC_SP = (eread (*@@not really, but an empty export doesn't
       work*));
       GPC_EP = (eread (*@@not really, but an empty export doesn't
       work*));
       GPC_BP = (MaxLongInt, ExitCode, ErrorAddr, Pos);
       GPC_Delphi = (MaxLongInt, Int64, EConvertError, ExitCode,
                     ErrorAddr, Pos, SetString, StringOfChar, TextFile,
                     AssignFile, CloseFile);

     const
       MaxLongInt = High (LongInt);

       { Maximum size of a variable }
       MaxVarSize = MaxInt div 8;

     type
       Int64 = Integer (64);

     { ====================== MEMORY MANAGEMENT ======================= }

     { Heap manipulation, from heap.c }

     { GPC implements both Mark/Release and Dispose. Both can be mixed
       freely
       in the same program. Dispose should be preferred, since it's
       faster. }

     { C heap management routines. NOTE: if Release is used anywhere in
       the program, CFreeMem and CReAllocMem may not be used for pointers
       that were not allocated with CGetMem. }
     function  CGetMem     (Size : SizeType) : Pointer; asmname 'malloc';
     procedure CFreeMem    (aPointer : Pointer); asmname 'free';
     function  CReAllocMem (aPointer : Pointer; NewSize : SizeType) :
       Pointer; asmname 'realloc';

     type
       GetMemType     = ^function (Size : SizeType) : Pointer;
       FreeMemType    = ^procedure (aPointer : Pointer);
       ReAllocMemType = ^function (aPointer : Pointer; NewSize :
       SizeType) : Pointer;

     { These variables can be set to user-defined routines for memory
       allocation/deallocation. GetMemPtr may return nil when
       insufficient memory is available. GetMem/New will produce a
       runtime error then. }
     var
       GetMemPtr     : GetMemType; asmname '_p_getmem_ptr'; external;
       FreeMemPtr    : FreeMemType; asmname '_p_freemem_ptr'; external;
       ReAllocMemPtr : ReAllocMemType; asmname '_p_reallocmem_ptr';
       external;

       { Points to the lowest byte of heap used }
       HeapBegin : Pointer; asmname '_p_heap_begin'; external;

       { Points to the highest byte of heap used }
       HeapHigh  : Pointer; asmname '_p_heap_high'; external;

     const
       UndocumentedReturnNil = Pointer (- 1);

     { Returns the number of pointers that would be released. aPointer
       must
       have been marked with Mark. For an example of its usage, see the
       HeapMon unit. }
     function  ReleaseCount (aPointer : Pointer) : Integer;
       asmname '_p_releasecount';

     procedure ReAllocMem (var aPointer : Pointer; NewSize : SizeType);
       asmname '_p_reallocmem';

     { Routines to handle endianness, from endian.pas }

     { Boolean constants about endianness and alignment }

     const
       BitsBigEndian  = {$ifdef __BITS_LITTLE_ENDIAN__} False
                        {$else}{$ifdef __BITS_BIG_ENDIAN__} True
                        {$else}{$error Bit endianness is not defined!}
                        {$endif}{$endif};

       BytesBigEndian = {$ifdef __BYTES_LITTLE_ENDIAN__} False
                        {$else}{$ifdef __BYTES_BIG_ENDIAN__} True
                        {$else}{$error Byte endianness is not defined!}
                        {$endif}{$endif};

       WordsBigEndian = {$ifdef __WORDS_LITTLE_ENDIAN__} False
                        {$else}{$ifdef __WORDS_BIG_ENDIAN__} True
                        {$else}{$error Word endianness is not defined!}
                        {$endif}{$endif};

       NeedAlignment  = {$ifdef __NEED_ALIGNMENT__} True
                        {$else} False {$endif};

     { Convert single variables from or to little or big endian format.
       This only works for a single variable or a plain array of a simple
       type. For more complicated structures, this has to be done for
       each component separately! Currently, ConvertFromFooEndian and
       ConvertToFooEndian are the same, but this might not be the case on
       middle-endian machines. Therefore, we provide different names. }
     procedure ReverseBytes            (var Buf; ElementSize, Count :
       SizeType); asmname '_p_reversebytes';
     procedure ConvertFromLittleEndian (var Buf; ElementSize, Count :
       SizeType); asmname '_p_convertlittleendian';
     procedure ConvertFromBigEndian    (var Buf; ElementSize, Count :
       SizeType); asmname '_p_convertbigendian';
     procedure ConvertToLittleEndian   (var Buf; ElementSize, Count :
       SizeType); asmname '_p_convertlittleendian';
     procedure ConvertToBigEndian      (var Buf; ElementSize, Count :
       SizeType); asmname '_p_convertbigendian';

     { Read a block from a file and convert it from little or
       big endian format. This only works for a single variable or a
       plain array of a simple type, note the comment for
       `ConvertFromLittleEndian' and `ConvertFromBigEndian'. }
     (*@@iocritical*)procedure BlockReadLittleEndian   (var aFile : File;
       var   Buf; ElementSize, Count : SizeType);
       asmname '_p_blockread_littleendian';
     (*@@iocritical*)procedure BlockReadBigEndian      (var aFile : File;
       var   Buf; ElementSize, Count : SizeType);
       asmname '_p_blockread_bigendian';

     { Write a block variable to a file and convert it to little or big
       endian format before. This only works for a single variable or a
       plain array of a simple type. Apart from this, note the comment
       for `ConvertToLittleEndian' and `ConvertToBigEndian'. }
     (*@@iocritical*)procedure BlockWriteLittleEndian  (var aFile : File;
       const Buf; ElementSize, Count : SizeType);
       asmname '_p_blockwrite_littleendian';
     (*@@iocritical*)procedure BlockWriteBigEndian     (var aFile : File;
       const Buf; ElementSize, Count : SizeType);
       asmname '_p_blockwrite_bigendian';

     { Read and write strings from/to binary files, where the length is
       stored in the given endianness and with a fixed size (64 bits),
       and therefore is independent of the system. }
     (*@@iocritical*)procedure ReadStringLittleEndian  (var f : File; var
       s : String); asmname '_p_ReadStringLittleEndian';
     (*@@iocritical*)procedure ReadStringBigEndian     (var f : File; var
       s : String); asmname '_p_ReadStringBigEndian';
     (*@@iocritical*)procedure WriteStringLittleEndian (var f : File;
       const s : String); asmname '_p_WriteStringLittleEndian';
     (*@@iocritical*)procedure WriteStringBigEndian    (var f : File;
       const s : String); asmname '_p_WriteStringBigEndian';

     { =================== STRING HANDLING ROUTINES =================== }

     { String handling routines, from string.pas }

     type
       AnyFile = Text; (*@@ create `AnyFile' parameters*)
       PAnyFile = ^AnyFile;

     { TString is a string type that is used for function results and
       local variables, as long as undiscriminated strings are not
       allowed there. The default size of 2048 characters should be
       enough for file names on any system, but can be changed when
       necessary. It should be at least as big as MAXPATHLEN. }

     const
       TStringSize = 2048;
       SpaceCharacters = [' ', #9];
       NewLine = "\n"; { the separator of lines within a string }
       LineBreak = {$ifdef __OS_DOS__} "\r\n" {$else} "\n" {$endif};
       { the separator of lines within a file }

     type
       TString    = String (TStringSize);
       TStringBuf = packed array [0 .. TStringSize] of Char;
       PString    = ^String;
       CharSet    = set of Char;
       PCStrings  = ^TCStrings;
       TCStrings  = array [0 .. MaxVarSize div SizeOf (CString)] of
       CString;

     var
       CParamCount : Integer; asmname '_p_argc'; external;
       CParameters : PCStrings; asmname '_p_argv'; external;

     function  MemCmp      (const s1, s2; Size : SizeType) : Integer;
       asmname 'memcmp';
     function  MemComp     (const s1, s2; Size : SizeType) : Integer;
       asmname 'memcmp';
     function  MemCompCase (const s1, s2; Size : SizeType) : Boolean;
       asmname '_p_memcmpcase';

     procedure UpCaseString    (var s : String);
       asmname '_p_upcase_string';
     procedure LoCaseString    (var s : String);
       asmname '_p_locase_string';
     function  UpCaseStr       (const s : String) : TString;
       asmname '_p_upcase_str';
     function  LoCaseStr       (const s : String) : TString;
       asmname '_p_locase_str';

     function  IsUpCase        (ch : Char) : Boolean;
       attribute (const); asmname '_p_isupcase';
     function  IsLoCase        (ch : Char) : Boolean;
       attribute (const); asmname '_p_islocase';
     function  IsAlpha         (ch : Char) : Boolean;
       attribute (const); asmname '_p_isalpha';
     function  IsAlphaNum      (ch : Char) : Boolean;
       attribute (const); asmname '_p_isalphanum';
     function  IsAlphaNumUnderscore (ch : Char) : Boolean;
       attribute (const); asmname '_p_isalphanumunderscore';
     function  IsSpace         (ch : Char) : Boolean;
       attribute (const); asmname '_p_isspace';
     function  IsPrintable     (ch : Char) : Boolean;
       attribute (const); asmname '_p_isprintable';

     function  StrEqualCase    (const s1, s2 : String) : Boolean;
       asmname '_p_strequalcase';

     function  Pos             (const SubString, aString : String) :
       Integer; asmname '_p_pos';
     function  LastPos         (const SubString, aString : String) :
       Integer; asmname '_p_lastpos';
     function  PosCase         (const SubString, aString : String) :
       Integer; asmname '_p_poscase';
     function  LastPosCase     (const SubString, aString : String) :
       Integer; asmname '_p_lastposcase';
     function  CharPos         (const Chars : CharSet; const aString :
       String) : Integer; asmname '_p_charpos';
     function  LastCharPos     (const Chars : CharSet; const aString :
       String) : Integer; asmname '_p_lastcharpos';

     function  PosFrom         (const SubString, aString : String; From :
       Integer) : Integer; asmname '_p_posfrom';
     function  LastPosTill     (const SubString, aString : String; Till :
       Integer) : Integer; asmname '_p_lastpostill';
     function  PosFromCase     (const SubString, aString : String; From :
       Integer) : Integer; asmname '_p_posfromcase';
     function  LastPosTillCase (const SubString, aString : String; Till :
       Integer) : Integer; asmname '_p_lastpostillcase';
     function  CharPosFrom     (const Chars : CharSet; const aString :
       String; From : Integer) : Integer; asmname '_p_charposfrom';
     function  LastCharPosTill (const Chars : CharSet; const aString :
       String; Till : Integer) : Integer; asmname '_p_lastcharpostill';

     function  IsPrefix        (const Prefix, s : String) : Boolean;
       asmname '_p_isprefix';
     function  IsSuffix        (const Suffix, s : String) : Boolean;
       asmname '_p_issuffix';
     function  IsPrefixCase    (const Prefix, s : String) : Boolean;
       asmname '_p_isprefixcase';
     function  IsSuffixCase    (const Suffix, s : String) : Boolean;
       asmname '_p_issuffixcase';

     function  CStringLength      (Src : CString) : SizeType;
       asmname '_p_strlen';
     function  CStringEnd         (Src : CString) : CString;
       asmname '_p_strend';
     function  CStringNew         (Src : CString) : CString;
       asmname '_p_strdup';
     function  CStringComp        (s1, s2 : CString) : Integer;
       asmname '_p_strcmp';
     function  CStringCaseComp    (s1, s2 : CString) : Integer;
       asmname '_p_strcasecmp';
     function  CStringLComp       (s1, s2 : CString; MaxLen : SizeType) :
       Integer; asmname '_p_strlcmp';
     function  CStringLCaseComp   (s1, s2 : CString; MaxLen : SizeType) :
       Integer; asmname '_p_strlcasecmp';
     function  CStringCopy        (Dest, Source : CString) : CString;
       asmname '_p_strcpy';
     function  CStringCopyEnd     (Dest, Source : CString) : CString;
       asmname '_p_strecpy';
     function  CStringLCopy       (Dest, Source : CString; MaxLen :
       SizeType) : CString; asmname '_p_strlcpy';
     function  CStringMove        (Dest, Source : CString; Count :
       SizeType) : CString; asmname '_p_strmove';
     function  CStringCat         (Dest, Source : CString) : CString;
       asmname '_p_strcat';
     function  CStringLCat        (Dest, Source : CString; MaxLen :
       SizeType) : CString; asmname '_p_strlcat';
     function  CStringChPos       (Src : CString; Ch : Char) : CString;
       asmname '_p_strscan';
     function  CStringLastChPos   (Src : CString; Ch : Char) : CString;
       asmname '_p_strrscan';
     function  CStringPos         (aString, SubString : CString) :
       CString; asmname '_p_strpos';
     function  CStringLastPos     (aString, SubString : CString) :
       CString; asmname '_p_strrpos';
     function  CStringCasePos     (aString, SubString : CString) :
       CString; asmname '_p_strcasepos';
     function  CStringLastCasePos (aString, SubString : CString) :
       CString; asmname '_p_strrcasepos';
     function  CStringUpCase      (s : CString) : CString;
       asmname '_p_strupper';
     function  CStringLoCase      (s : CString) : CString;
       asmname '_p_strlower';
     function  CStringIsEmpty     (s : CString) : Boolean;
       asmname '_p_strempty';
     function  NewCString         (const Source : String) : CString;
       asmname '_p_newcstring';
     function  CStringCopyString  (Dest : CString; const Source :
       String) : CString; asmname '_p_cstringcopystring';
     procedure CopyCString        (Source : CString; var Dest : String);
       asmname '_p_copycstring';

     function  NewString       (const s : String) : PString;
       asmname '_p_newstring';
     procedure DisposeString   (p : PString); asmname '_p_dispose';

     procedure SetString       (var s : String; Buffer : PChar; Count :
       Integer); asmname '_p_set_string';
     function  StringOfChar    (Ch : Char; Count : Integer) = s :
       TString; asmname '_p_string_of_char';

     procedure TrimLeft        (var s : String); asmname '_p_trimleft';
     procedure TrimRight       (var s : String); asmname '_p_trimright';
     procedure TrimBoth        (var s : String); asmname '_p_trimboth';
     function  TrimLeftStr     (const s : String) : TString;
       asmname '_p_trimleft_str';
     function  TrimRightStr    (const s : String) : TString;
       asmname '_p_trimright_str';
     function  TrimBothStr     (const s : String) : TString;
       asmname '_p_trimboth_str';

     function  GetStringCapacity (const s : String) : Integer;
       asmname '_p_get_string_capacity';

     { A shortcut for a common use of WriteStr as a function }
     function  Integer2String (i : Integer) : TString;
       asmname '_p_Integer2String';

     type
       TChars = packed array [1 .. 1] of Char;
       PChars = ^TChars;

       { Under development. Interface subject to change.
         Use with caution. }
       { When a const or var AnyString parameter is passed, internally
         these records are passed as const parameters. Value AnyString
         parameters are passed like value string parameters. }
       ConstAnyString = record
         Length : Integer;
         Chars  : PChars
       end;

       { Capacity is the allocated space (used internally). Count is the
         actual number of environment strings. The CStrings array
         contains the environment strings, terminated by a nil pointer,
         which is not counted in Count. @CStrings can be passed to libc
         routines like execve which expect an environment (see
         GetCEnvironment). }
       PEnvironment = ^TEnvironment;
       TEnvironment (Capacity : Integer) = record
         Count : Integer;
         CStrings : array [1 .. Capacity + 1] of CString
       end;

     var
       Environment : PEnvironment; asmname '_p_environment'; external;

     { Get an environment variable. If it does not exist, GetEnv returns
       the empty string, which can't be distinguished from a variable
       with an empty value, while CStringGetEnv returns nil then. Note,
       Dos doesn't know empty environment variables, but treats them as
       non-existing, and does not distinguish case in the names of
       environment variables. However, even under Dos, empty environment
       variables and variable names with different case can now be set
       and used within GPC programs. }
     function  GetEnv (const EnvVar : String) : TString;
       asmname '_p_getenv';
     function  CStringGetEnv (EnvVar : CString) : CString;
       asmname '_p_cstringgetenv';

     { Sets an environment variable with the name given in VarName to the
       value
       Value. A previous value, if any, is overwritten. }
     procedure SetEnv (const VarName, Value : String);
       asmname '_p_setenv';

     { Un-sets an environment variable with the name given in VarName. }
     procedure UnSetEnv (const VarName : String); asmname '_p_unsetenv';

     { Returns @Environment^.CStrings, converted to PCStrings, to be
       passed to
       libc routines like execve which expect an environment. }
     function  GetCEnvironment : PCStrings; asmname '_p_getcenvironment';

     { ================= RUNTIME ERROR HANDLING ETC. ================== }

     { Error handling functions, from error.pas }

     const
       EOpen = 405;
       EOpenRead = 442;
       EOpenWrite = 443;
       EOpenUpdate = 444;
       EReading = 464;
       EWriting = 466;
       ERead = 413;
       EWrite = 414;
       EWriteReadOnly = 422;
       EMMap = 408;
       EIOCtl = 630;
       EConvertError = 875;

     var
       { Error number (after runtime error) or exit status (after Halt)
       or
         0 (during program run and after succesful termination). }
       ExitCode : Integer; asmname '_p_exitcode'; external;

       { Contains the address of the code where a runtime occurred, nil
         if no runtime error occurred. }
       ErrorAddr : Pointer; asmname '_p_erroraddr'; external;

       { Error message }
       ErrorMessageString : TString; asmname '_p_errormessagestring';
       external;

     function  GetErrorMessage                 (n : Integer) : CString;
       asmname '_p_errmsg';
     procedure RuntimeError                    (n : Integer);
       attribute (noreturn); asmname '_p_error';
     procedure RuntimeErrorInteger             (n : Integer; i : MedInt);
       attribute (noreturn); asmname '_p_error_integer';
     procedure RuntimeErrorCString             (n : Integer; s :
       CString);                attribute (noreturn);
       asmname '_p_error_string';
     procedure InternalError                   (n : Integer);
       attribute (noreturn); asmname '_p_internal_error';
     procedure InternalErrorInteger            (n : Integer; i : MedInt);
       attribute (noreturn); asmname '_p_internal_error_integer';
     procedure RuntimeWarning                  (Message : CString);
       asmname '_p_warning';
     procedure RuntimeWarningInteger           (Message : CString; i :
       MedInt); asmname '_p_warning_integer';
     procedure RuntimeWarningCString           (Message : CString; s :
       CString); asmname '_p_warning_string';
     procedure DebugStatement                  (const FileName : String;
       Line : Integer); asmname '_p_debug_statement';

     (*iocritical*)procedure IOError                         (n :
       Integer); asmname '_p_io_error';
     (*iocritical*)procedure IOErrorInteger                  (n :
       Integer; i : MedInt); asmname '_p_io_error_integer';
     (*iocritical*)procedure IOErrorCString                  (n :
       Integer; s : CString); asmname '_p_io_error_string';
     (*iocritical*)procedure IOErrorFile                     (n :
       Integer; protected var f : AnyFile); asmname '_p_io_error_file';
     function  GetIOErrorMessage : TString;
       asmname '_p_get_io_error_message';
     procedure CheckInOutRes; asmname '_p_check_inoutres';

     { Registers a procedure to be called to restore the terminal for
       another process that accesses the terminal, or back for the
       program itself. Used e.g. by the CRT unit. The procedures must
       allow for being called multiple times in any order, even at the
       end of the program (see the comment for RestoreTerminal). }
     procedure RegisterRestoreTerminal (ForAnotherProcess : Boolean;
       procedure Proc); asmname '_p_RegisterRestoreTerminal';

     { Unregisters a procedure registered with RegisterRestoreTerminal.
       Returns False if the procedure had not been registered, and True
       if it had been registered and was unregistered successfully. }
     function UnregisterRestoreTerminal (ForAnotherProcess : Boolean;
       procedure Proc) : Boolean; asmname '_p_UnregisterRestoreTerminal';

     { Calls the procedures registered by RegisterRestoreTerminal. When
       restoring the terminal for another process, the procedures are
       called in the opposite order of registration. When restoring back
       for the program, they are called in the order of registration.

       `RestoreTerminal (True)' will also be called at the end of the
       program, before outputting any runtime error message. It can also
       be used if you want to write an error message and exit the program
       (especially when using e.g. the CRT unit). For this purpose, to
       avoid side effects, call RestoreTerminal immediately before
       writing the error message (to StdErr, not to Output!), and then
       exit the program (e.g. with Halt). }
     procedure RestoreTerminal (ForAnotherProcess : Boolean);
       asmname '_p_RestoreTerminal';

     { Executes a command line. Reports execution errors via the IOResult
       mechanism and returns the exit status of the executed program.
       Execute calls RestoreTerminal with the argument True before and
       False after executing the process, ExecuteNoTerminal does not. }
     (*@@IO critical*)function  Execute (const CmdLine : String) :
       Integer; asmname '_p_execute';
     (*@@IO critical*)function  ExecuteNoTerminal (const CmdLine :
       String) : Integer; asmname '_p_executenoterminal';

     procedure AtExit (procedure Proc); asmname '_p_atexit';

     procedure SetReturnAddress (Address : Pointer);
       asmname '_p_SetReturnAddress';
     procedure RestoreReturnAddress; asmname '_p_RestoreReturnAddress';

     { ==================== SIGNALS AND PROCESSES ===================== }

     function  ProcessID : Integer; asmname '_p_pid';

     { Extract information from the status returned by PWait }
     function StatusExited     (Status : Integer) : Boolean; attribute
       (const); asmname '_p_WIfExited';
     function StatusExitCode   (Status : Integer) : Integer; attribute
       (const); asmname '_p_WExitStatus';
     function StatusSignaled   (Status : Integer) : Boolean; attribute
       (const); asmname '_p_WIfSignaled';
     function StatusTermSignal (Status : Integer) : Integer; attribute
       (const); asmname '_p_WTermSig';
     function StatusStopped    (Status : Integer) : Boolean; attribute
       (const); asmname '_p_WIfStopped';
     function StatusStopSignal (Status : Integer) : Integer; attribute
       (const); asmname '_p_WStopSig';

     type
       TSignalHandler = procedure (Signal : Integer);

     { OldHandler and OldRestart may be null }
     function InstallSignalHandler (Signal : Integer; Handler :
       TSignalHandler;
                                    Restart, UnlessIgnored : Boolean;
                                    var OldHandler : TSignalHandler; var
       OldRestart : Boolean) : Boolean; asmname '_p_sigaction';
     procedure BlockSignal   (Signal : Integer; Block : Boolean);
       asmname '_p_BlockSignal';
     function  SignalBlocked (Signal : Integer) : Boolean;
       asmname '_p_SignalBlocked';

     var
       { Signal actions }
       SignalDefault : TSignalHandler; asmname '_p_SIG_DFL'; external;
       SignalIgnore  : TSignalHandler; asmname '_p_SIG_IGN'; external;
       SignalError   : TSignalHandler; asmname '_p_SIG_ERR'; external;

       { Signals. The constants are set to the signal numbers, and
         are 0 for signals not defined. }
       { POSIX signals }
       SigHUp    : Integer; asmname '_p_SIGHUP'; external;
       SigInt    : Integer; asmname '_p_SIGINT'; external;
       SigQuit   : Integer; asmname '_p_SIGQUIT'; external;
       SigIll    : Integer; asmname '_p_SIGILL'; external;
       SigAbrt   : Integer; asmname '_p_SIGABRT'; external;
       SigFPE    : Integer; asmname '_p_SIGFPE'; external;
       SigKill   : Integer; asmname '_p_SIGKILL'; external;
       SigSegV   : Integer; asmname '_p_SIGSEGV'; external;
       SigPipe   : Integer; asmname '_p_SIGPIPE'; external;
       SigAlrm   : Integer; asmname '_p_SIGALRM'; external;
       SigTerm   : Integer; asmname '_p_SIGTERM'; external;
       SigUsr1   : Integer; asmname '_p_SIGUSR1'; external;
       SigUsr2   : Integer; asmname '_p_SIGUSR2'; external;
       SigChld   : Integer; asmname '_p_SIGCHLD'; external;
       SigCont   : Integer; asmname '_p_SIGCONT'; external;
       SigStop   : Integer; asmname '_p_SIGSTOP'; external;
       SigTStp   : Integer; asmname '_p_SIGTSTP'; external;
       SigTTIn   : Integer; asmname '_p_SIGTTIN'; external;
       SigTTOu   : Integer; asmname '_p_SIGTTOU'; external;

       { Non-POSIX signals }
       SigTrap   : Integer; asmname '_p_SIGTRAP'; external;
       SigIOT    : Integer; asmname '_p_SIGIOT'; external;
       SigEMT    : Integer; asmname '_p_SIGEMT'; external;
       SigBus    : Integer; asmname '_p_SIGBUS'; external;
       SigSys    : Integer; asmname '_p_SIGSYS'; external;
       SigStkFlt : Integer; asmname '_p_SIGSTKFLT'; external;
       SigUrg    : Integer; asmname '_p_SIGURG'; external;
       SigIO     : Integer; asmname '_p_SIGIO'; external;
       SigPoll   : Integer; asmname '_p_SIGPOLL'; external;
       SigXCPU   : Integer; asmname '_p_SIGXCPU'; external;
       SigXFSz   : Integer; asmname '_p_SIGXFSZ'; external;
       SigVTAlrm : Integer; asmname '_p_SIGVTALRM'; external;
       SigProf   : Integer; asmname '_p_SIGPROF'; external;
       SigPwr    : Integer; asmname '_p_SIGPWR'; external;
       SigInfo   : Integer; asmname '_p_SIGINFO'; external;
       SigLost   : Integer; asmname '_p_SIGLOST'; external;
       SigWinCh  : Integer; asmname '_p_SIGWINCH'; external;

       { Signal subcodes (only used on some systems, -1 if not used) }
       FPEIntegerOverflow        : Integer; asmname '_p_FPE_INTOVF_TRAP';
       external;
       FPEIntegerDivisionByZero  : Integer; asmname '_p_FPE_INTDIV_TRAP';
       external;
       FPESubscriptRange         : Integer; asmname '_p_FPE_SUBRNG_TRAP';
       external;
       FPERealOverflow           : Integer; asmname '_p_FPE_FLTOVF_TRAP';
       external;
       FPERealDivisionByZero     : Integer; asmname '_p_FPE_FLTDIV_TRAP';
       external;
       FPERealUnderflow          : Integer; asmname '_p_FPE_FLTUND_TRAP';
       external;
       FPEDecimalOverflow        : Integer; asmname '_p_FPE_DECOVF_TRAP';
       external;

     { Returns a description for a signal }
     function  StrSignal (Signal : Integer) : TString;
       asmname '_p_strsignal';

     { Sends a signal to a process. Returns True if successful. If Signal
       is 0, it doesn't send a signal, but still checks whether it would
       be possible to send a signal to the given process. }
     function  Kill (PID, Signal : Integer) : Boolean; asmname '_p_kill';

     const
       AnyChild = - 1;

     { Waits for a child process with the given PID (or any child process
       if PID = AnyChild) to terminate or be stopped. Returns the PID of
       the process. WStatus will contain the status and can be evaluated
       with StatusExited etc.. If nothing happened, and Block is False,
       the function will return 0, and WStatus will be 0. If an error
       occurred (especially on single tasking systems where WaitPID is
       not possible), the function will return a negative value, and
       WStatus will be 0. }
     function  WaitPID (PID : Integer; var WStatus : Integer; Block :
       Boolean) : Integer; asmname '_p_waitpid';

     { Sets the process group of Process (or the current one if Process
       is 0) to ProcessGroup (or its PID if ProcessGroup is 0). Returns
       True if successful. }
     function  SetProcessGroup (Process, ProcessGroup : Integer) :
       Boolean; asmname '_p_setpgid';

     { Sets the process group of a terminal given by Terminal (as a file
       handle) to ProcessGroup. ProcessGroup must be the ID of a process
       group in the same session. Returns True if successful. }
     function  SetTerminalProcessGroup (Terminal, ProcessGroup :
       Integer) : Boolean; asmname '_p_tcsetpgrp';

     { Returns the process group of a terminal given by Terminal (as a
       file handle), or -1 on error. }
     function  GetTerminalProcessGroup (Terminal : Integer) : Integer;
       asmname '_p_tcgetpgrp';

     { Returns the file name of the terminal device that is open on the
       file f. Returns nil if (and only if) f is not open or not
       connected to a terminal. }
     function  GetTerminalName (protected var f : AnyFile) : CString;
       asmname '_p_ttyname';

     { Set the standard input's signal generation, if it is a terminal. }
     procedure SetInputSignals (Signals : Boolean);
       asmname '_p_set_isig';

     { Get the standard input's signal generation, if it is a terminal. }
     function  GetInputSignals : Boolean; asmname '_p_get_isig';

     { Returns the real or effective user ID of the process. }
     function  UserID  (Effective : Boolean) : Integer; asmname '_p_uid';

     { Returns the real or effective group ID of the process. }
     function  GroupID (Effective : Boolean) : Integer; asmname '_p_gid';

     { ================= COMMAND LINE OPTION PARSING ================== }

     const
       EndOfOptions      = #255;
       NoOption          = #1;
       UnknownOption     = '?';
       LongOption        = #0;
       UnknownLongOption = '?';

     var
       FirstNonOption         : Integer; asmname '_p_first_non_option';
       external;
       HasOptionArgument      : Boolean;
       asmname '_p_has_option_argument';      external;
       OptionArgument         : TString; asmname '_p_option_argument';
       external;
       UnknownOptionCharacter : Char;
       asmname '_p_unknown_option_character'; external;
       GetOptErrorFlag        : Boolean; asmname '_p_getopt_error_flag';
       external;

     {
       Parses command line arguments for options and returns the next
       one.

       If a command line argument starts with `-', and is not exactly `-'
       or `--', then it is an option element. The characters of this
       element (aside from the initial `-') are option characters. If
       `GetOpt' is called repeatedly, it returns successively each of the
       option characters from each of the option elements.

       If `GetOpt' finds another option character, it returns that
       character, updating `FirstNonOption' and internal variables so
       that the next call to `GetOpt' can resume the scan with the
       following option character or command line argument.

       If there are no more option characters, `GetOpt' returns
       EndOfOptions. Then `FirstNonOption' is the index of the first
       command line argument that is not an option. (The command line
       arguments have been permuted so that those that are not options
       now come last.)

       OptString must be of the form `[+|-]abcd:e:f:g::h::i::'.

       a, b, c are options without arguments
       d, e, f are options with required arguments
       g, h, i are options with optional arguments

       Arguments are text following the option character in the same
       command line argument, or the text of the following command line
       argument. They are returned in OptionArgument. If an option has no
       argument, OptionArgument is empty. The variable HasOptionArgument
       tells whether an option has an argument. This is mostly useful for
       options with optional arguments, if one wants to distinguish an
       empty argument from no argument.

       If the first character of OptString is `+', GetOpt stops at the
       first non-option argument.

       If it is `-', GetOpt treats non-option arguments as options and
       return NoOption for them.

       Otherwise, GetOpt permutes arguments and handles all options,
       leaving all non-options at the end. However, if the environment
       variable POSIXLY_CORRECT is set, the default behaviour is to stop
       at the first non-option argument, as with `+'.

       The special argument `--' forces an end of option-scanning
       regardless of the first character of OptString. In the case of
       `-', only `--' can cause GetOpt to return EndOfOptions with
       FirstNonOption <= ParamCount.

       If an option character is seen that is not listed in OptString,
       UnknownOption is returned. The unrecognized option character is
       stored in UnknownOptionCharacter. Unless GetOptErrorFlag is set to
       False, an error message is printed to StdErr automatically.
     }
     function GetOpt (const OptString : String) : Char;
       asmname '_p_getopt';

     type
       OptArgType = (NoArgument, RequiredArgument, OptionalArgument);

       OptionType = record
         Name     : CString;
         Argument : OptArgType;
         Flag     : ^Char; { if nil, V is returned. Otherwise, Flag^ is }
         V        : Char   { set to V, and LongOption is returned }
       end;

     {
       Recognize short options, described by OptString as above, and long
       options, described by LongOptions.

       Long-named options begin with `--' instead of `-'. Their names may
       be abbreviated as long as the abbreviation is unique or is an
       exact match for some defined option. If they have an argument, it
       follows the option name in the same argument, separated from the
       option name by a `=', or else the in next argument. When GetOpt
       finds a long-named option, it returns LongOption if that option's
       `Flag' field is non-nil, and the value of the option's `V' field
       if the `Flag' field is nil.

       LongIndex, if not null, returns the index in LongOptions of the
       long-named option found. It is only valid when a long-named option
       has been found by the most recent call.

       If LongOnly is set, `-' as well as `--' can indicate a long
       option. If an option that starts with `-' (not `--') doesn't match
       a long option, but does match a short option, it is parsed as a
       short option instead. If an argument has the form `-f', where f is
       a valid short option, don't consider it an abbreviated form of a
       long option that starts with `f'. Otherwise there would be no way
       to give the `-f' short option. On the other hand, if there's a
       long option `fubar' and the argument is `-fu', do consider that an
       abbreviation of the long option, just like `--fu', and not `-f'
       with argument `u'. This distinction seems to be the most useful
       approach.

       As an additional feature (not present in the C counterpart), if
       the last character of OptString is `-' (after a possible starting
       `+' or `-' character), or OptString is empty, all long options
       with a nil `Flag' field will automatically be recognized as short
       options with the character given by the `V' field. This means, in
       the common (and recommended) case that all short options have long
       equivalents, you can simply pass an empty OptString (or pass `+-'
       or `--' as OptString if you want this behaviour, see the comment
       for GetOpt), and you will only have to maintain the LongOptions
       array when you add or change options.
     }
     function GetOptLong (const OptString : String; var LongOptions :
       array [m .. n : Integer] of OptionType { can be null };
                          var LongIndex : Integer { can be null };
       LongOnly : Boolean) : Char; asmname '_p_getopt_long';

     { Reset GetOpt's state and make the next GetOpt or GetOptLong start
       (again) with the StartArgument'th argument (may be 1). This is
       useful for special purposes only. It is *necessary* to do this
       after altering the contents of CParamCount/CParameters (which is
       not usually done, either). }
     procedure ResetGetOpt (StartArgument : Integer);
       asmname '_p_ResetGetOpt';

     { =========================== PEXECUTE =========================== }

     const
       PExecute_First   = 1;
       PExecute_Last    = 2;
       PExecute_One     = PExecute_First or PExecute_Last;
       PExecute_Search  = 4;
       PExecute_Verbose = 8;

     {
       PExecute: execute a program.

       Program and Arguments are the arguments to execv/execvp.

       Flags and PExecute_Search is non-zero if $PATH should be searched
       (It's not clear that GCC passes this flag correctly). Flags and
       PExecute_First is nonzero for the first process in chain. Flags
       and PExecute_Last is nonzero for the last process in chain.

       The result is the pid on systems like Unix where we fork/exec and
       on systems like MS-Windows and OS2 where we use spawn. It is up to
       the caller to wait for the child.

       The result is the exit code on systems like MSDOS where we spawn
       and wait for the child here.

       Upon failure, ErrMsg is set to the text of the error message,
       and -1 is returned. `errno' is available to the caller to use.

       PWait: cover function for wait.

       PID is the process id of the task to wait for. Status is the
       `status' argument to wait. Flags is currently unused (allows
       future enhancement without breaking upward compatibility). Pass 0
       for now.

       The result is the process ID of the child reaped, or -1 for
       failure.

       On systems that don't support waiting for a particular child, PID
       is ignored. On systems like MSDOS that don't really multitask
       PWait is just a mechanism to provide a consistent interface for
       the caller.
     }
     function PExecute (ProgramName : CString; Arguments : PCStrings; var
       ErrMsg : String; Flags : Integer) : Integer;
       asmname '_p_pexecute';
     function PWait (PID : Integer; var Status : Integer; Flags :
       Integer) : Integer; asmname 'pwait';

     { ==================== TIME HANDLING ROUTINES ==================== }

     { Time and date routines for Extended Pascal, from time.pas }

     const
       DateLength = 11; { from types.h }
       TimeLength = 8;  { from types.h }
       InvalidYear = - MaxInt;

     type
       UnixTimeType = LongInt; { This is hard-coded in the compiler. Do
       not change here. }
       MicroSecondTimeType = LongInt;

       DateString = packed array [1 .. DateLength] of Char;
       TimeString = packed array [1 .. TimeLength] of Char;

     var
       { DayOfWeekName is a constant and therefore does not respect the
         locale. Therefore, it's recommended to use FormatTime instead. }
       DayOfWeekName : array [0 .. 6] of String [9];
       asmname '_p_downame'; external;

       { MonthName is a constant and therefore does not respect the
         locale. Therefore, it's recommended to use FormatTime instead. }
       MonthName : array [1 .. 12] of String [9]; asmname '_p_monthname';
       external;

     function  GetDayOfWeek (Day, Month, Year : Integer) : Integer;
       asmname '_p_dayofweek';
     procedure UnixTimeToTimeStamp (UnixTime : UnixTimeType; var
       aTimeStamp : TimeStamp); asmname '_p_unix_time_to_time_stamp';
     function  TimeStampToUnixTime (protected var aTimeStamp :
       TimeStamp) : UnixTimeType; asmname '_p_time_stamp_to_unix_time';
     function  GetMicroSecondTime : MicroSecondTimeType;
       asmname '_p_get_micro_second_time';

     { Is the year a leap year? }
     function  IsLeapYear (Year : Integer) : Boolean;
       asmname '_p_is_leap_year';

     { Returns the length of the month, taking leap years into account. }
     function  MonthLength (Month, Year : Integer) : Integer;
       asmname '_p_month_length';

     procedure Sleep (Seconds : Integer); asmname '_p_sleep';
     procedure SleepMicroSeconds (MicroSeconds : Integer);
       asmname '_p_sleep_microseconds';
     function  Alarm (Seconds : Integer) : Integer; asmname '_p_alarm';
     procedure UnixTimeToTime (UnixTime : UnixTimeType; var Year, Month,
       Day, Hour, Minute, Second : Integer);
       asmname '_p_unix_time_to_time';
     function  TimeToUnixTime (Year, Month, Day, Hour, Minute, Second :
       Integer) : UnixTimeType; asmname '_p_time_to_unix_time';

     { Get the real time. MicroSecond can be null and is ignored then. }
     function  GetUnixTime (var MicroSecond : Integer) : UnixTimeType;
       asmname '_p_get_unix_time';

     { Get the CPU time used. MicroSecond can be null and is ignored
       then.
       Now, GetCPUTime can measure long CPU times reliably on most
       systems
       (e.g. Solaris where it didn't work before). }
     function  GetCPUTime (var MicroSecond : Integer) : Integer;
       asmname '_p_get_cpu_time';

     {
       Formats a TimeStamp value according to a Format string. The format
       string can contain date/time items consisting of `%', followed by
       the specifiers listed below. All characters outside of these items
       are copied to the result unmodified. The specifiers correspond to
       those of the C function strftime(), including POSIX.2 and glibc
       extensions and some more extensions. The extensions are also
       available on systems whose strftime() doesn't support them.

       The following modifiers may appear after the `%':

       `_'  The item is left padded with spaces to the given or default
            width.

       `-'  The item is not padded at all.

       `0'  The item is left padded with zeros to the given or default
            width.

       `/'  The item is right trimmed if it is longer than the given
            width.

       `^'  The item is converted to upper case.

       `~'  The item is converted to lower case.

       After zero or more of these flags, an optional width may be
       specified for padding and trimming. It must be given as a decimal
       number (not starting with `0' since `0' has a meaning of its own,
       see above).

       Afterwards, the following optional modifiers may follow. Their
       meaning is locale-dependent, and many systems and locales just
       ignore them.

       `E'  Use the locale's alternate representation for date and time.
            In a Japanese locale, for example, `%Ex' might yield a date
            format based on the Japanese Emperors' reigns.

       `O'  Use the locale's alternate numeric symbols for numbers. This
            modifier applies only to numeric format specifiers.

       Finally, exactly one of the following specifiers must appear. The
       padding rules listed here are the defaults that can be overriden
       with the modifiers listed above.

       `a'  The abbreviated weekday name according to the current locale.

       `A'  The full weekday name according to the current locale.

       `b'  The abbreviated month name according to the current locale.

       `B'  The full month name according to the current locale.

       `c'  The preferred date and time representation for the current
            locale.

       `C'  The century of the year. This is equivalent to the greatest
            integer not greater than the year divided by 100.

       `d'  The day of the month as a decimal number (`01' .. `31').

       `D'  The date using the format `%m/%d/%y'. NOTE: Don't use this
            format if it can be avoided. Things like this caused Y2K
            bugs!

       `e'  The day of the month like with `%d', but padded with blanks
            (` 1' .. `31').

       `F'  The date using the format `%Y-%m-%d'. This is the form
            specified in the ISO 8601 standard and is the preferred form
            for all uses.

       `g'  The year corresponding to the ISO week number, but without
            the century (`00' .. `99'). This has the same format and
            value as `y', except that if the ISO week number (see `V')
            belongs to the previous or next year, that year is used
            instead. NOTE: Don't use this format if it can be avoided.
            Things like this caused Y2K bugs!

       `G'  The year corresponding to the ISO week number. This has the
            same format and value as `Y', except that if the ISO week
            number (see `V') belongs to the previous or next year, that
            year is used instead.

       `h'  The abbreviated month name according to the current locale.
            This is the same as `b'.

       `H'  The hour as a decimal number, using a 24-hour clock
            (`00' .. `23').

       `I'  The hour as a decimal number, using a 12-hour clock
            (`01' .. `12').

       `j'  The day of the year as a decimal number (`001' .. `366').

       `k'  The hour as a decimal number, using a 24-hour clock like `H',
            but padded with blanks (` 0' .. `23').

       `l'  The hour as a decimal number, using a 12-hour clock like `I',
            but padded with blanks (` 1' .. `12').

       `m'  The month as a decimal number (`01' .. `12').

       `M'  The minute as a decimal number (`00' .. `59').

       `n'  A single newline character.

       `p'  Either `AM' or `PM', according to the given time value; or
            the corresponding strings for the current locale. Noon is
            treated as `PM' and midnight as `AM'.

       `P'  Either `am' or `pm', according to the given time value; or
            the corresponding strings for the current locale, printed in
            lowercase characters. Noon is treated as `pm' and midnight as
            `am'.

       `Q'  The fractional part of the second. This format has special
            effects on the modifiers. The width, if given, determines the
            number of digits to output. Therefore, no actual clipping or
            trimming is done. However, if padding with spaces is
            specified, any trailing (i.e., left!) zeros are converted to
            spaces, and if "no padding" is specified, they are removed.
            The default is "padding with zeros", i.e. trailing zeros are
            left unchanged. The digits are cut when necessary without
            rounding (otherwise, the value would not be consistent with
            the seconds given by `S' and `s'). Note that GPC's TimeStamp
            currently provides for microsecond resolution, so there are
            at most 6 valid digits (which is also the default width), any
            further digits will be 0 (but if TimeStamp will ever change,
            this format will be adjusted). However, the actual resolution
            provided by the operating system via GetTimeStamp etc. may be
            far lower (e.g., ~1/18s under Dos).

       `r'  The complete time using the AM/PM format of the current
            locale.

       `R'  The hour and minute in decimal numbers using the format
            `%H:%M'.

       `s'  Unix time, i.e. the number of seconds since the epoch, i.e.,
            since 1970-01-01 00:00:00 UTC. Leap seconds are not counted
            unless leap second support is available.

       `S'  The seconds as a decimal number (`00' .. `60').

       `t'  A single tab character.

       `T'  The time using decimal numbers using the format `%H:%M:%S'.

       `u'  The day of the week as a decimal number (`1' .. `7'), Monday
            being `1'.

       `U'  The week number of the current year as a decimal number
            (`00' .. `53'), starting with the first Sunday as the first
            day of the first week. Days preceding the first Sunday in the
            year are considered to be in week `00'.

       `V'  The ISO 8601:1988 week number as a decimal number
            (`01' .. `53'). ISO weeks start with Monday and end with
            Sunday. Week `01' of a year is the first week which has the
            majority of its days in that year; this is equivalent to the
            week containing the year's first Thursday, and it is also
            equivalent to the week containing January 4. Week `01' of a
            year can contain days from the previous year. The week before
            week `01' of a year is the last week (`52' or `53') of the
            previous year even if it contains days from the new year.

       `w'  The day of the week as a decimal number (`0' .. `6'), Sunday
            being `0'.

       `W'  The week number of the current year as a decimal number
            (`00' .. `53'), starting with the first Monday as the first
            day of the first week. All days preceding the first Monday in
            the year are considered to be in week `00'.

       `x'  The preferred date representation for the current locale, but
            without the time.

       `X'  The preferred time representation for the current locale, but
            with no date.

       `y'  The year without a century as a decimal number
            (`00' .. `99'). This is equivalent to the year modulo 100.
            NOTE: Don't use this format if it can be avoided. Things like
            this caused Y2K bugs!

       `Y'  The year as a decimal number, using the Gregorian calendar.
            Years before the year `1' are numbered `0', `-1', and so on.

       `z'  RFC 822/ISO 8601:1988 style numeric time zone (e.g., `-0600'
            or `+0100'), or nothing if no time zone is determinable.

       `Z'  The time zone abbreviation (empty if the time zone can't be
            determined).

       `%'  (i.e., an item `%%') A literal `%' character.
     }
     function  FormatTime (const Time : TimeStamp; const Format :
       String) : TString; asmname '_p_format_time';

     { ==================== FILE HANDLING ROUTINES ==================== }

     { File handling routines and their support, mostly from files.pas
       and file.c }

     type
       FileSizeType = LongInt;

     procedure GetBinding   (protected var aFile : AnyFile; var
       aBinding : BindingType); asmname '_p_binding';
     procedure ClearBinding (var aBinding : BindingType);
       asmname '_p_clearbinding';

     { TFDD interface @@ Subject to change! Use with caution! }

     type
       TOpenMode   = (foNone, foReset, foRewrite, foAppend, foSeekRead,
       foSeekWrite, foSeekUpdate);
       TOpenProc   = procedure (var PrivateData; Mode : TOpenMode);
       TSelectFunc = function  (var PrivateData; Writing : Boolean) :
       Integer; { called before select(), must return a handle }
       TSelectProc = procedure (var PrivateData; var ReadSelect,
       WriteSelect, ExceptSelect : Boolean); { called before and after
       select() }
       TReadFunc   = function  (var PrivateData; var   Buffer; Size :
       SizeType) : SizeType;
       TWriteFunc  = function  (var PrivateData; const Buffer; Size :
       SizeType) : SizeType;
       TFileProc   = procedure (var PrivateData);
       TFlushProc  = TFileProc;
       TCloseProc  = TFileProc;
       TDoneProc   = TFileProc;

     procedure AssignTFDD (var f : AnyFile;
                           OpenProc    : TOpenProc;
                           SelectFunc  : TSelectFunc;
                           SelectProc  : TSelectProc;
                           ReadFunc    : TReadFunc;
                           WriteFunc   : TWriteFunc;
                           FlushProc   : TFlushProc;
                           CloseProc   : TCloseProc;
                           DoneProc    : TDoneProc;
                           PrivateData : Pointer);
       asmname '_p_assign_tfdd';

     procedure SetTFDD    (var f : AnyFile;
                           OpenProc    : TOpenProc;
                           SelectFunc  : TSelectFunc;
                           SelectProc  : TSelectProc;
                           ReadFunc    : TReadFunc;
                           WriteFunc   : TWriteFunc;
                           FlushProc   : TFlushProc;
                           CloseProc   : TCloseProc;
                           DoneProc    : TDoneProc;
                           PrivateData : Pointer); asmname '_p_set_tfdd';

     { Any parameter except f may be null }
     procedure GetTFDD    (var f : AnyFile;
                           var OpenProc    : TOpenProc;
                           var SelectFunc  : TSelectFunc;
                           var SelectProc  : TSelectProc;
                           var ReadFunc    : TReadFunc;
                           var WriteFunc   : TWriteFunc;
                           var FlushProc   : TFlushProc;
                           var CloseProc   : TCloseProc;
                           var DoneProc    : TDoneProc;
                           var PrivateData : Pointer);
       asmname '_p_get_tfdd';

     type
       Natural = 1 .. MaxInt;
       IOSelectEvents = (SelectReadOrEOF, SelectRead, SelectEOF,
       SelectWrite, SelectException, SelectAlways);

     const
       IOSelectEventMin = (*Low (IOSelectEvents);*)SelectReadOrEOF;
       IOSelectEventMax = Pred (SelectAlways);

     type
       IOSelectType = record
         f : PAnyFile;
         Wanted : set of IOSelectEvents;
         Occurred : set of IOSelectEventMin .. IOSelectEventMax
       end;

     { Waits for one of several events to happen. Returns when one or
       more of the wanted events for one of the files occur. If they have
       already occurred before calling the function, it returns
       immediately. MicroSeconds can specify a timeout. If it is 0, the
       function will return immediately, whether or not an event has
       occurred. If it is negative, the function will wait forever until
       an event occurs. The Events parameter can be null, in which case
       the function only waits for the timeout. If any of the file
       pointers (f) in Events are nil or the files pointed to are closed,
       they are simply ignored for convenience.

       It returns the index of one of the files for which any event has
       occurred. If events have occurred for several files, is it
       undefined which of these file's index is returned. If no event
       occurs until the timeout, 0 is returned. If an error occurs or the
       target system does not have a select() system call and Events is
       not null, a negative value is returned. In the Occurred field of
       the elements of Events, events that have occurred are set. The
       state of events not wanted is undefined.

       The possible events are:
       SelectReadOrEOF: the file is at EOF or data can be read now.
       SelectRead:      data can be read now.
       SelectEOF:       the file is at EOF.
       SelectWrite:     data can be written now.
       SelectException: an exception occurred on the file.
       SelectAlways:    if this is set, *all* requested events will be
                        checked for this file in any case. Otherwise,
                        checks may be skipped if already another event
                        for this or another file was found.

       Notes:
       Checking for EOF requires some reading ahead internally (just like
       the EOF function) which can be avoided by setting SelectReadOrEOF
       instead of SelectRead and SelectEOF. If this is followed by, e.g.,
       a BlockRead with 4 parameters, the last parameter will be 0 if and
       only the file is at EOF, and otherwise, data will be read directly
       from the file without reading ahead and buffering.

       SelectAlways should be set for files for which events are
       considered to be of higher priority than others. Otherwise, if one
       is interested in just any event, not setting SelectAlways may be a
       little faster. }
     function IOSelect (var Events : array [m .. n : Natural] of
       IOSelectType; MicroSeconds : MicroSecondTimeType) : Integer;
       asmname '_p_ioselect';

     { A simpler interface to SelectIO for the most common use. Waits for
       SelectReadOrEOF on all files and returns an index. }
     function IOSelectRead (const Files : array [m .. n : Natural] of
       PAnyFile; MicroSeconds : MicroSecondTimeType) : Integer;
       asmname '_p_ioselectread';

     procedure AssignFile   (var T : AnyFile; const Name : String);
       asmname '_p_assign';
     procedure AssignBinary (var T : Text; const Name : String);
       asmname '_p_assign_binary';
     procedure AssignHandle (var T : AnyFile; Handle : Integer);
       asmname '_p_assign_handle';

     { BP compatible seeking routines }
     function  SeekEOF  (var f : Text) : Boolean; asmname '_p_seekeof';
     function  SeekEOLn (var f : Text) : Boolean; asmname '_p_seekeoln';

     { Under development }
     procedure AnyStringTFDD_Reset (var f : AnyFile; var Buf :
       ConstAnyString); asmname '_p_anystring_tfdd_reset';
     (*procedure AnyStringTFDD_Rewrite (var f : AnyFile; var Buf :
       VarAnyString); asmname '_p_anystring_tfdd_rewrite';*)
     procedure StringTFDD_Reset (var f : AnyFile; var Buf :
       ConstAnyString; const s : String); asmname '_p_string_tfdd_reset';
     (*procedure StringTFDD_Rewrite (var f : AnyFile; var Buf :
       VarAnyString; var s : String); asmname '_p_string_tfdd_rewrite';*)

     (*@@iocritical*)procedure FileMove (var f : AnyFile; NewName :
       CString; Overwrite : Boolean); asmname '_p_mv';

     { Flags that can be ORed into FileMode. The default value of
       FileMode is FileMode_Reset_ReadWrite. The somewhat confusing
       values are meant to be compatible to BP (as far as BP supports
       them). }
     const
       { Allow writing to binary files opened with Reset }
       FileMode_Reset_ReadWrite      = 2;

       { Do not allow reading from files opened with Rewrite }
       FileMode_Rewrite_WriteOnly    = 4;

       { Do not allow reading from files opened with Extend }
       FileMode_Extend_WriteOnly     = 8;

       { Allow writing to text files opened with Reset }
       FileMode_Text_Reset_ReadWrite = $100;

     { File mode constants that are ORed for BindingType.Mode and ChMod.
       The values below are valid for all OSs (as far as supported). If
       the OS uses different values, they're converted internally. }
     const
       fm_SetUID           = 8#4000;
       fm_SetGID           = 8#2000;
       fm_Sticky           = 8#1000;
       fm_UserReadable     = 8#400;
       fm_UserWritable     = 8#200;
       fm_UserExecutable   = 8#100;
       fm_GroupReadable    = 8#40;
       fm_GroupWritable    = 8#20;
       fm_GroupExecutable  = 8#10;
       fm_OthersReadable   = 8#4;
       fm_OthersWritable   = 8#2;
       fm_OthersExecutable = 8#1;

     type
       TextFile = Text;

       StatFSBuffer = record
         BlockSize, BlocksTotal, BlocksFree : LongestInt;
         FilesTotal, FilesFree : Integer
       end;

     procedure CloseFile    (          var aFile : (*@@Any*)File);
       asmname '_p_close';
     (*@@IO critical*) procedure ChMod        (          var aFile :
       AnyFile; Mode : Integer); asmname '_p_chmod';
     (*@@IO critical*) procedure StatFS       (Path : CString; var Buf :
       StatFSBuffer); asmname '_p_statfs';

     { Checks if data are available to be read from aFile. This is
       similar to
       `not EOF (aFile)', but does not block on "files" that can grow,
       like TTYs
       or pipes. }
     function  CanRead      (var aFile : AnyFile) : Boolean;
       asmname '_p_canread';

     { Get the file handle. }
     function  FileHandle   (protected var aFile : AnyFile) : Integer;
       asmname '_p_filehandle';

     { Lock files }
     function  FileLock   (var aFile : AnyFile; WriteLock, Block :
       Boolean) : Boolean; asmname '_p_filelock';
     function  FileUnlock (var aFile : AnyFile) : Boolean;
       asmname '_p_fileunlock';

     const
       mm_Readable   = 1;
       mm_Writable   = 2;
       mm_Executable = 4;

     function MemoryMap (Start : Pointer; Length : SizeType; Access :
       Integer; Shared : Boolean;
                         var aFile : AnyFile; Offset : FileSizeType) :
       Pointer; asmname '_p_mmap';
     procedure MemoryUnMap (Start : Pointer; Length : SizeType);
       asmname '_p_munmap';

     { File name routines, from filename.pas }

     {
       Define constants for different systems:

       OSDosFlag:         flag to indicate whether the target system is
                          Dos

       QuotingCharacter:  the character used to quote wild cards and
                          other special characters (#0 if not available)

       PathSeparator:     the separator of multiple paths, e.g. in the
                          PATH environment variable

       DirSeparator:      the separator of the directories within a full
                          file name

       DirSeparators:     a set of all possible directory and drive name
                          separators

       ExtSeparator:      the separator of a file name extension

       DirRoot:           the name of the root directory

       DirSelf:           the name of a directory in itself

       DirParent:         the name of the parent directory

       MaskNoStdDir:      a file name mask that matches all names except
                          the standard directories DirSelf and DirParent

       NullDeviceName:    the full file name of the null device

       TTYDeviceName:     the full file name of the current TTY

       ConsoleDeviceName: the full file name of the system console. On
                          Dos systems, this is the same as the TTY, but
                          on systems that allow remote login, this is a
                          different thing and may reach a completely
                          different user than the one running the
                          program, so use with care.

       EnvVarCharsFirst:  the characters accepted at the beginning of the
                          name of an environment variable without quoting

       EnvVarChars:       the characters accepted in the name of an
                          environment variable without quoting

       PathEnvVar:        the name of the environment variable which
                          (usually) contains the executable search path

       ShellEnvVar:       the name of the environment variable which
                          (usually) contains the path of the shell
                          executable (see GetShellPath)

       ShellExecCommand:  the option to the (default) shell to execute
                          the command specified in the following argument
                          (see GetShellPath)

       ConfigFileMask:    a mask for the option file name as returned by
                          ConfigFileName

       FileNamesCaseSensitive:
                          flag to indicate whether file names are case
                          sensitive
     }

     const
       UnixShellEnvVar        = 'SHELL';
       UnixShellExecCommand   = '-c';

     {$ifdef __OS_DOS__}

     const
       OSDosFlag              = True;
       QuotingCharacter       = #0;
       PathSeparator          = {$ifdef __CYGWIN32__} ':' {$else} ';'
       {$endif};
       DirSeparator           = '\';
       DirSeparators          = [':', '\', '/'];
       ExtSeparator           = '.';
       DirRoot                = '\';
       DirSelf                = '.';
       DirParent              = '..';
       MaskNoStdDir           = '{*,.[^.],..?*}';
       NullDeviceName         = 'nul';
       TTYDeviceName          = 'con';
       ConsoleDeviceName      = 'con';
       EnvVarCharsFirst       = ['A' .. 'Z', 'a' .. 'z', '_'];
       EnvVarChars            = EnvVarCharsFirst + ['0' .. '9'];
       PathEnvVar             = 'PATH';
       ShellEnvVar            = 'COMSPEC';
       ShellExecCommand       = '/c';
       ConfigFileMask         = '*.cfg';
       FileNamesCaseSensitive = False;

     {$else}

     const
       OSDosFlag              = False;
       QuotingCharacter       = '\';
       PathSeparator          = ':';
       DirSeparator           = '/';
       DirSeparators          = ['/'];
       ExtSeparator           = '.';
       DirRoot                = '/';
       DirSelf                = '.';
       DirParent              = '..';
       MaskNoStdDir           = '{*,.[^.],..?*}';
       NullDeviceName         = '/dev/null';
       TTYDeviceName          = '/dev/tty';
       ConsoleDeviceName      = '/dev/console';
       EnvVarCharsFirst       = ['A' .. 'Z', 'a' .. 'z', '_'];
       EnvVarChars            = EnvVarCharsFirst + ['0' .. '9'];
       PathEnvVar             = 'PATH';
       ShellEnvVar            = UnixShellEnvVar;
       ShellExecCommand       = UnixShellExecCommand;
       ConfigFileMask         = '.*';
       FileNamesCaseSensitive = True;

     {$endif}

     const
       WildCardChars = ['*', '?', '[', ']'];
       FileNameSpecialChars = (WildCardChars + SpaceCharacters +
       ['{', '}', '$', QuotingCharacter]) - DirSeparators;

     type
       DirPtr = Pointer;

       { `+ 1' is a waste, but it is so the size of the array is not
         zero for Count = 0 }
       PPStrings = ^TPStrings;
       TPStrings (Count : Cardinal) = array [1 .. Count + 1] of ^String;

       GlobBuffer = record
         Result    : PPStrings;
         Internal1 : Pointer;
         Internal2 : PCStrings;
         Internal3 : Integer
       end;

     { Convert ch to lower case if FileNamesCaseSensitive is False, leave
       it unchanged otherwise. }
     function  FileNameLoCase (ch : Char) : Char;
       asmname '_p_filenamelocase';

     { Change a file name to use the OS dependent directory separator }
     function  Slash2OSDirSeparator (const s : String) : TString;
       asmname '_p_slash2osdirseparator';

     { Change a file name to use '/' as directory separator }
     function  OSDirSeparator2Slash (const s : String) : TString;
       asmname '_p_osdirseparator2slash';

     { Like Slash2OSDirSeparator for CStrings -- NOTE: overwrites the
       CString }
     function  Slash2OSDirSeparator_CString (s : CString) : CString;
       asmname '_p_slash2osdirseparator_cstring';

     { Like OSDirSeparator2Slash for CStrings -- NOTE: overwrites the
       CString }
     function  OSDirSeparator2Slash_CString (s : CString) : CString;
       asmname '_p_osdirseparator2slash_cstring';

     { Add a DirSeparator to the end of s, if there is not already one
       and s denotes an existing directory }
     function  AddDirSeparator (const s : String) : TString;
       asmname '_p_adddirseparator';

     { Like AddDirSeparator, but also if the directory does not exist }
     function  ForceAddDirSeparator (const s : String) : TString;
       asmname '_p_forceadddirseparator';

     { Remove all trailing DirSeparators from s, if there are any, as
       long as removing them doesn't change the meaning (i.e., they don't
       denote the root directory. }
     function  RemoveDirSeparator (const s : String) : TString;
       asmname '_p_removedirseparator';

     { Returns the current directory using OS dependent directory
       separators }
     function  GetCurrentDirectory     : TString;
       asmname '_p_get_current_directory';

     { Returns a directory suitable for storing temporary files using OS
       dependent directory separators. If found, the result always ends
       in DirSeparator. If no suitable directory is found, an empty
       string is returned. }
     function  GetTempDirectory        : TString;
       asmname '_p_get_temp_directory';

     { Returns a non-existing file name in the directory given. If the
       directory doesn't exist or the Directory name is empty, a runtime
       error is raised, and GetTempFileNameInDirectory returns the empty
       string. }
     (*@@iocritical*)function  GetTempFileNameInDirectory (const
       Directory : String) : TString;
       asmname '_p_get_temp_file_name_in_directory';

     { Returns a non-existing file name in GetTempDirectory. If no temp
       directory is found, i.e. GetTempDirectory returns the empty
       string, a runtime error is raised, and GetTempFileName returns the
       empty string as well. }
     (*@@iocritical*)function  GetTempFileName         : TString;
       asmname '_p_get_temp_file_name';

     { The same as GetTempFileName, but returns a CString allocated from
       the heap. }
     (*@@iocritical*)function  GetTempFileName_CString : CString;
       asmname '_p_get_temp_file_name_cstring';

     { Get the external name of a file }
     function  FileName (protected var f : AnyFile) : TString;
       asmname '_p_file_name';

     { Returns true if the given file name is an existing plain file }
     function  FileExists      (const aFileName : String) : Boolean;
       asmname '_p_file_exists';

     { Returns True if the given file name is an existing directory }
     function  DirectoryExists (const aFileName : String) : Boolean;
       asmname '_p_directory_exists';

     { Returns True if the given file name is an existing file, directory
       or special file (device, pipe, socket, etc.) }
     function  PathExists      (const aFileName : String) : Boolean;
       asmname '_p_path_exists';

     { If a file of the given name exists in one of the directories given
       in DirList (separated by PathSeparator), returns the full path,
       otherwise returns an empty string. If aFileName already contains
       an element of DirSeparators, returns Slash2OSDirSeparator
       (aFileName) if it exists. }
     function  FSearch (const aFileName, DirList : String) : TString;
       asmname '_p_fsearch';

     { Like FSearch, but only find executable files. Under Dos, if not
       found, the function tries appending '.com', '.exe', '.bat' and
       `.cmd' (the last one only if $COMSPEC points to a `cmd.exe'), so
       you don't have to specify these extensions in aFileName (and with
       respect to portability, it might be preferable not to do so). }
     function  FSearchExecutable (const aFileName, DirList : String) :
       TString; asmname '_p_fsearch_executable';

     { Replaces all occurrences of `$FOO' and `~' in s by the value of
       the environment variables FOO or HOME, respectively. If a variable
       is not defined, the function returns False, and s contains the
       name of the undefined variable (or the empty string if the
       variable name is invalid, i.e., doesn't start with a character
       from EnvVarCharsFirst). Otherwise, if all variables are found, s
       contains the replaced string, and True is returned. }
     function  ExpandEnvironment (var s : String) : Boolean;
       asmname '_p_expand_environment';

     { Expands the given path name to a full path name. Relative paths
       are expanded using the current directory, and occurrences of
       DirSelf and DirParent are resolved. Under Dos, the result is
       converted to lower case and a trailing ExtSeparator (except in a
       trailing DirSelf or DirParent) is removed, like Dos does. If the
       directory, i.e. the path without the file name, is invalid, the
       empty string is returned. }
     function  FExpand       (const Path : String) : TString;
       asmname '_p_fexpand';

     { Like FExpand, but unquotes the directory before expanding it, and
       quotes WildCardChars again afterwards. Does not check if the
       directory is valid (because it may contain wild card characters).
       Symlinks are expanded only in the directory part, not the file
       name. }
     function  FExpandQuoted (const Path : String) : TString;
       asmname '_p_fexpandquoted';

     { FExpands Path, and then removes the current directory from it, if
       it is a prefix of it. If OnlyCurDir is set, the current directory
       will be removed only if Path denotes a file in, not below, it. }
     function  RelativePath (const Path : String; OnlyCurDir, Quoted :
       Boolean) : TString; asmname '_p_relative_path';

     { Is aFileName a UNC filename? (Always returns False on non-Dos
       systems.) }
     function  IsUNC (const aFileName : String) : Boolean;
       asmname '_p_IsUNC';

     { Splits a file name into directory, name and extension. Each of
       Dir, Name and Ext may be null. }
     procedure FSplit (const Path : String; var Dir, Name, Ext : String);
       asmname '_p_fsplit';

     { Functions that extract one or two of the parts from FSplit.
       DirFromPath returns DirSelf + DirSeparator if the path contains no
       directory. }
     function  DirFromPath     (const Path : String) : TString;
       asmname '_p_dir_from_path';
     function  NameFromPath    (const Path : String) : TString;
       asmname '_p_name_from_path';
     function  ExtFromPath     (const Path : String) : TString;
       asmname '_p_ext_from_path';
     function  NameExtFromPath (const Path : String) : TString;
       asmname '_p_name_ext_from_path';

     { Start reading a directory. If successful, a pointer is returned
       that can be used for subsequent calls to ReadDir and finally
       CloseDir. On failure, an I/O error is raised and (in case it is
       ignored) nil is returned. }
     (*@@iocritical*)function  OpenDir  (const Name : String) : DirPtr;
       asmname '_p_opendir';

     { Reads one entry from the directory Dir, and returns the file name.
       On errors or end of directory, the empty string is returned. }
     function  ReadDir  (Dir : DirPtr) : TString; asmname '_p_readdir';

     { Closes a directory opened with OpenDir. }
     (*@@iocritical*)procedure CloseDir (Dir : DirPtr);
       asmname '_p_closedir';

     { Returns the first position of a non-quoted character of CharSet in
       s, or 0 if no such character exists. }
     function  FindNonQuotedChar (Chars : CharSet; const s : String;
       From : Integer) : Integer; asmname '_p_findnonquotedchar';

     { Returns the first occurence of SubString in s that is not quoted
       at the beginning, or 0 if no such occurence exists. }
     function  FindNonQuotedStr (const SubString, s : String; From :
       Integer) : Integer; asmname '_p_findnonquotedstr';

     { Does a string contain non-quoted wildcard characters? }
     function  HasWildCards (const s : String) : Boolean;
       asmname '_p_haswildcards';

     { Does a string contain non-quoted wildcard characters, braces or
       spaces? }
     function  HasWildCardsOrBraces (const s : String) : Boolean;
       asmname '_p_haswildcardsorbraces';

     { Insert QuotingCharacter into s before any special characters }
     function  QuoteFileName (const s : String; const SpecialCharacters :
       CharSet) : TString; asmname '_p_quote_filename';

     { Remove QuotingCharacter from s }
     function  UnQuoteFileName (const s : String) : TString;
       asmname '_p_unquote_filename';

     { Splits s at non-quoted spaces and expands non-quoted braces like
       bash does. The result and its entries should be disposed after
       usage, e.g. with DisposePPStrings. }
     function  BraceExpand (const s : String) : PPStrings;
       asmname '_p_braceexpand';

     { Dispose of a PPStrings array as well as the strings it contains.
       If you want to keep the strings (by assigning them to other string
       pointers), you should instead free the PPStrings array with
       `Dispose'. }
     procedure DisposePPStrings (Strings : PPStrings);
       asmname '_p_DisposePPStrings';

     { Tests if a file name matches a shell wildcard pattern (?, *, []) }
     function  FileNameMatch (const Pattern, Name : String) : Boolean;
       asmname '_p_filenamematch';

     { FileNameMatch with BraceExpand }
     function  MultiFileNameMatch (const Pattern, Name : String) :
       Boolean; asmname '_p_multifilenamematch';

     { File name globbing }
     { GlobInit is implied by Glob and MultiGlob, not by GlobOn and
       MultiGlobOn. GlobOn and MultiGlobOn must be called after GlobInit,
       Glob or MultiGlob. MultiGlob and MultiGlobOn do brace expansion,
       Glob and GlobOn do not. GlobFree frees the memory allocated by the
       globbing functions and invalidates the results in Buf. It should
       be called after globbing. }
     procedure GlobInit    (var Buf : GlobBuffer); asmname '_p_globinit';
     procedure Glob        (var Buf : GlobBuffer; const Pattern :
       String); asmname '_p_glob';
     procedure GlobOn      (var Buf : GlobBuffer; const Pattern :
       String); asmname '_p_globon';
     procedure MultiGlob   (var Buf : GlobBuffer; const Pattern :
       String); asmname '_p_multiglob';
     procedure MultiGlobOn (var Buf : GlobBuffer; const Pattern :
       String); asmname '_p_multiglobon';
     procedure GlobFree    (var Buf : GlobBuffer); asmname '_p_globfree';

     type
       TPasswordEntry = record
         UserName, RealName, Password, HomeDirectory, Shell : TString;
         UID, GID : Integer
       end;

       PPasswordEntries = ^TPasswordEntries;
       TPasswordEntries (Count : Integer) = array [1 .. Count] of
       TPasswordEntry;

     { Finds a password entry by user name. Returns True if found, False
       otherwise. }
     function  GetPasswordEntryByName (const UserName : String; var
       Entry : TPasswordEntry) : Boolean;
       asmname '_p_getpasswordentrybyname';

     { Finds a password entry by UID. Returns True if found, False
       otherwise. }
     function  GetPasswordEntryByUID  (UID : Integer; var Entry :
       TPasswordEntry) : Boolean; asmname '_p_getpasswordentrybyuid';

     { Returns all password entries, or nil if none found. }
     function  GetPasswordEntries : PPasswordEntries;
       asmname '_p_getpasswordentries';

     { Returns the mount point (Unix) or drive (Dos) which is part of the
       given path. If the path does not contain any (i.e., is a relative
       path), an empty string is returned. Therefore, if you want to get
       the mount point or drive in any case, apply `FExpand' or
       `RealPath' to the argument. }
     function  GetMountPoint (const Path : String) = Result : TString;
       asmname '_p_GetMountPoint';

     type
       TSystemInfo = record
         OSName,
         OSRelease,
         OSVersion,
         MachineType,
         HostName,
         DomainName : TString
       end;

     { Returns system information if available. Fields not available will
       be empty. }
     function  SystemInfo : TSystemInfo; asmname '_p_SystemInfo';

     { Returns the path to the shell (as the return value) and the option
       that makes it execute the command specified in the following
       argument (in `Option'). Usually these are the environment value of
       ShellEnvVar, and ShellExecCommand, but on Dos systems, the
       function will first try UnixShellEnvVar, and UnixShellExecCommand
       because ShellEnvVar will usually point to command.com, but
       UnixShellEnvVar can point to bash which is usually a better choice
       when present. If UnixShellEnvVar is not set, or the shell given
       does not exist, it will use ShellEnvVar, and ShellExecCommand.
       Option may be null (in case you want to invoke the shell
       interactively). }
     function  GetShellPath (var Option : String) : TString;
       asmname '_p_GetShellPath';

     { Returns the path of the running executable. NOTE: On most systems,
       this is *not* guaranteed to be the full path, but often just the
       same as `ParamStr (0)' which usually is the name given on the
       command line. Only on some systems with special support, it
       returns the full path when `ParamStr (0)' doesn't. }
     function  ExecutablePath : TString; asmname '_p_executable_path';

     { Returns a file name suitable for a global (system-wide) or local
       (user-specific) configuration file, depending on the Global
       parameter. The function does not guarantee that the file name
       returned exists or is readable or writable.

       In the following table, the base name `<base>' is given with the
       Name parameter. If it is empty, the base name is the name of the
       running program (as returned by ExecutablePath, without directory
       and extension. `<prefix>' (Unix only) stands for the value of the
       Prefix parameter (usual values include '', '/usr' and
       '/usr/local'). `<dir>' (Dos only) stands for the directory where
       the running program resides. `$foo' stands for the value of the
       environment variable `foo'.

              Global                    Local
       Unix:  <prefix>/etc/<base>.conf  $HOME/.<base>

       Dos:   $DJDIR\etc\<base>.ini     $HOME\<base>.cfg
              <dir>\<base>.ini          <dir>\<base>.cfg

       As you see, there are two possibilities under Dos. If the first
       file exists, it is returned. Otherwise, if the second file exists,
       that is returned. If none of them exists (but the program might
       want to create a file), if the environment variable (DJDIR or
       HOME, respectively) is set, the first file name is returned,
       otherwise the second one. This rather complicated scheme should
       give the most reasonable results for systems with or without DJGPP
       installed, and with or without already existing config files. Note
       that DJDIR is always set on systems with DJGPP installed, while
       HOME is not. However, it is easy for users to set it if they want
       their config files in a certain directory rather than with the
       executables. }
     function  ConfigFileName (const Prefix, Name : String; Global :
       Boolean) : TString; asmname '_p_config_file_name';

     { Returns a directory name suitable for global, machine-independent
       data. The function garantees that the name returned ends with a
       DirSeparator, but does not guarantee that it exists or is
       readable or writable.

       Note: If the prefix is empty, it is assumed to be '/usr'. (If you
       really want /share, you could pass '/' as the prefix, but that's
       very uncommon.)

       Unix: <prefix>/share/<base>/

       Dos:  $DJDIR\share\<base>\
             <dir>\

       About the symbols used above, and the two possibilities under Dos,
       see the comments for ConfigFileName. }
     function  DataDirectoryName (const Prefix, Name : String) : TString;
       asmname '_p_data_directory_name';

     { ==================== MATHEMATICAL ROUTINES ===================== }

     function  IsInfinity   (x : Extended) : Boolean; attribute (const);
       asmname '_p_isinf';
     function  IsNotANumber (x : Extended) : Boolean; attribute (const);
       asmname '_p_isnan';
     procedure SplitReal    (x : Extended; var Exponent : Integer; var
       Mantissa : Extended); asmname '_p_frexp';
     function  SinH         (x : Double)    : Double; asmname '_p_sinh';
     function  CosH         (x : Double)    : Double; asmname '_p_cosh';
     function  Arctan2      (y, x : Double) : Double;
       asmname '_p_arctan2';

     type
       RandomSeedType = Cardinal (32);
       RandomizeType  = ^procedure;
       SeedRandomType = ^procedure (Seed : RandomSeedType);
       RandRealType   = ^function : LongestReal;
       RandIntType    = ^function (MaxValue : LongestCard) : LongestCard;

     var
       RandomizePtr  : RandomizeType; asmname '_p_randomize_ptr';
       external;
       SeedRandomPtr : SeedRandomType; asmname '_p_seedrandom_ptr';
       external;
       RandRealPtr   : RandRealType; asmname '_p_randreal_ptr'; external;
       RandIntPtr    : RandIntType; asmname '_p_randint_ptr'; external;

     procedure SeedRandom (Seed : RandomSeedType);
       asmname '_p_seedrandom';

     end.