freepascal.compiler/rtl/unix/sysutils.pp

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

    Sysutils unit for linux

    See the file COPYING.FPC, included in this distribution,
    for details about the copyright.

    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

 **********************************************************************}
unit sysutils;
interface

{$MODE objfpc}
{$MODESWITCH OUT}
{ force ansistrings }
{$H+}

{$if (defined(BSD) or defined(SUNOS)) and defined(FPC_USE_LIBC)}
{$define USE_VFORK}
{$endif}

{$DEFINE OS_FILESETDATEBYNAME}
{$DEFINE HAS_SLEEP}
{$DEFINE HAS_OSERROR}
{$DEFINE HAS_OSCONFIG}
{$DEFINE HAS_TEMPDIR}
{$DEFINE HASUNIX}
{$DEFINE HASCREATEGUID}
{$DEFINE HAS_OSUSERDIR}
{$DEFINE HAS_LOCALTIMEZONEOFFSET}
{$DEFINE HAS_GETTICKCOUNT64}
uses
  Unix,errors,sysconst,Unixtype;

{ Include platform independent interface part }
{$i sysutilh.inc}

Function AddDisk(const path:string) : Byte;

{ the following is Kylix compatibility stuff, it should be moved to a
  special compatibilty unit (FK) }
  const
    RTL_SIGINT     = 0;
    RTL_SIGFPE     = 1;
    RTL_SIGSEGV    = 2;
    RTL_SIGILL     = 3;
    RTL_SIGBUS     = 4;
    RTL_SIGQUIT    = 5;
    RTL_SIGLAST    = RTL_SIGQUIT;
    RTL_SIGDEFAULT = -1;

  type
    TSignalState = (ssNotHooked, ssHooked, ssOverridden);

function InquireSignal(RtlSigNum: Integer): TSignalState;
procedure AbandonSignalHandler(RtlSigNum: Integer);
procedure HookSignal(RtlSigNum: Integer);
procedure UnhookSignal(RtlSigNum: Integer; OnlyIfHooked: Boolean = True);

implementation

Uses
  {$ifdef FPC_USE_LIBC}initc{$ELSE}Syscall{$ENDIF}, Baseunix, unixutil;

type
  tsiginfo = record
    oldsiginfo: sigactionrec;
    hooked: boolean;
  end;

const
  rtlsig2ossig: array[RTL_SIGINT..RTL_SIGLAST] of byte =
    (SIGINT,SIGFPE,SIGSEGV,SIGILL,SIGBUS,SIGQUIT);
  { to avoid linking in all this stuff in every program,
    as it's unlikely to be used by anything but libraries
  }
  signalinfoinited: boolean = false;

var
  siginfo: array[RTL_SIGINT..RTL_SIGLAST] of tsiginfo;
  oldsigfpe: SigActionRec; external name '_FPC_OLDSIGFPE';
  oldsigsegv: SigActionRec; external name '_FPC_OLDSIGSEGV';
  oldsigbus: SigActionRec; external name '_FPC_OLDSIGBUS';
  oldsigill: SigActionRec; external name '_FPC_OLDSIGILL';


procedure defaultsighandler; external name '_FPC_DEFAULTSIGHANDLER';
procedure installdefaultsignalhandler(signum: Integer; out oldact: SigActionRec); external name '_FPC_INSTALLDEFAULTSIGHANDLER';


function InternalInquireSignal(RtlSigNum: Integer; out act: SigActionRec; frominit: boolean): TSignalState;
  begin
    result:=ssNotHooked;
    if (RtlSigNum<>RTL_SIGDEFAULT) and
       (RtlSigNum<RTL_SIGLAST) then
      begin
        if (frominit or
            siginfo[RtlSigNum].hooked) and
           (fpsigaction(rtlsig2ossig[RtlSigNum],nil,@act)=0) then
          begin
            if not frominit then
              begin
                { check whether the installed signal handler is still ours }
{$if not defined(aix) and (not defined(linux) or not defined(cpupowerpc64))}
                if (pointer(act.sa_handler)=pointer(@defaultsighandler)) then
{$else}
                { on aix and linux/ppc64, procedure addresses are actually
                  descriptors -> check whether the code addresses inside the
                  descriptors match, rather than the descriptors themselves }
                if (ppointer(act.sa_handler)^=ppointer(@defaultsighandler)^) then
{$endif}
                  result:=ssHooked
                else
                  result:=ssOverridden;
              end
            else if IsLibrary then
              begin
                { library -> signals have not been hooked by system init code }
                exit
              end
            else
              begin
                { program -> signals have been hooked by system init code }
                if (byte(RtlSigNum) in [RTL_SIGFPE,RTL_SIGSEGV,RTL_SIGILL,RTL_SIGBUS]) then
                  begin
{$if not defined(aix) and (not defined(linux) or not defined(cpupowerpc64))}
                    if (pointer(act.sa_handler)=pointer(@defaultsighandler)) then
{$else}
                    if (ppointer(act.sa_handler)^=ppointer(@defaultsighandler)^) then
{$endif}
                      result:=ssHooked
                    else
                      result:=ssOverridden;
                    { return the original handlers as saved by the system unit
                      (the current call to sigaction simply returned our
                       system unit's installed handlers)
                    }
                    case RtlSigNum of
                      RTL_SIGFPE:
                        act:=oldsigfpe;
                      RTL_SIGSEGV:
                        act:=oldsigsegv;
                      RTL_SIGILL:
                        act:=oldsigill;
                      RTL_SIGBUS:
                        act:=oldsigbus;
                    end;
                  end
                else
                  begin
                    { these are not hooked in the startup code }
                    result:=ssNotHooked;
                  end
              end
          end
      end;
  end;


procedure initsignalinfo;
  var
    i: Integer;
  begin
    for i:=RTL_SIGINT to RTL_SIGLAST do
      siginfo[i].hooked:=(InternalInquireSignal(i,siginfo[i].oldsiginfo,true)=ssHooked);
    signalinfoinited:=true;
  end;


function InquireSignal(RtlSigNum: Integer): TSignalState;
  var
    act: SigActionRec;
  begin
    if not signalinfoinited then
      initsignalinfo;
    result:=InternalInquireSignal(RtlSigNum,act,false);
  end;


procedure AbandonSignalHandler(RtlSigNum: Integer);
  begin
    if not signalinfoinited then
      initsignalinfo;
    if (RtlSigNum<>RTL_SIGDEFAULT) and
       (RtlSigNum<RTL_SIGLAST) then
      siginfo[RtlSigNum].hooked:=false;
  end;


procedure HookSignal(RtlSigNum: Integer);
  var
    lowsig, highsig, i: Integer;
  begin
    if not signalinfoinited then
      initsignalinfo;
    if (RtlSigNum<>RTL_SIGDEFAULT) then
      begin
        lowsig:=RtlSigNum;
        highsig:=RtlSigNum;
      end
    else
      begin
        { we don't hook SIGINT and SIGQUIT by default }
        lowsig:=RTL_SIGFPE;
        highsig:=RTL_SIGBUS;
      end;
    { install the default rtl signal handler for the selected signal(s) }
    for i:=lowsig to highsig do
      begin
        installdefaultsignalhandler(rtlsig2ossig[i],siginfo[i].oldsiginfo);
        siginfo[i].hooked:=true;
      end;
  end;


procedure UnhookSignal(RtlSigNum: Integer; OnlyIfHooked: Boolean = True);
  var
    act: SigActionRec;
    lowsig, highsig, i: Integer;
    state: TSignalState;
  begin
    if not signalinfoinited then
      initsignalinfo;
    if (RtlSigNum<>RTL_SIGDEFAULT) then
      begin
        lowsig:=RtlSigNum;
        highsig:=RtlSigNum;
      end
    else
      begin
        { we don't hook SIGINT and SIGQUIT by default }
        lowsig:=RTL_SIGFPE;
        highsig:=RTL_SIGBUS;
      end;
    for i:=lowsig to highsig do
      begin
        if not OnlyIfHooked or
           (InquireSignal(i)=ssHooked) then
          begin
            { restore the handler that was present when we hooked the signal,
              if we hooked it at one time or another. If the user doesn't
              want this, they have to call AbandonSignalHandler() first
            }
            if siginfo[i].hooked then
              act:=siginfo[i].oldsiginfo
            else
              begin
                fillchar(act,sizeof(act),0);
                pointer(act.sa_handler):=pointer(SIG_DFL);
              end;
            if (fpsigaction(rtlsig2ossig[RtlSigNum],@act,nil)=0) then
              siginfo[i].hooked:=false;
          end;
      end;
  end;

{$Define OS_FILEISREADONLY} // Specific implementation for Unix.

{$DEFINE FPC_FEXPAND_TILDE} { Tilde is expanded to home }
{$DEFINE FPC_FEXPAND_GETENVPCHAR} { GetEnv result is a PChar }

{ Include platform independent implementation part }
{$i sysutils.inc}

{ Include SysCreateGUID function }
{$i suuid.inc}

Const
{Date Translation}
  C1970=2440588;
  D0   =   1461;
  D1   = 146097;
  D2   =1721119;


Procedure JulianToGregorian(JulianDN:LongInt;Var Year,Month,Day:Word);
Var
  YYear,XYear,Temp,TempMonth : LongInt;
Begin
  Temp:=((JulianDN-D2) shl 2)-1;
  JulianDN:=Temp Div D1;
  XYear:=(Temp Mod D1) or 3;
  YYear:=(XYear Div D0);
  Temp:=((((XYear mod D0)+4) shr 2)*5)-3;
  Day:=((Temp Mod 153)+5) Div 5;
  TempMonth:=Temp Div 153;
  If TempMonth>=10 Then
   Begin
     inc(YYear);
     dec(TempMonth,12);
   End;
  inc(TempMonth,3);
  Month := TempMonth;
  Year:=YYear+(JulianDN*100);
end;



Procedure EpochToLocal(epoch:longint;var year,month,day,hour,minute,second:Word);
{
  Transforms Epoch time into local time (hour, minute,seconds)
}
Var
  DateNum: LongInt;
Begin
  inc(Epoch,TZSeconds);
  Datenum:=(Epoch Div 86400) + c1970;
  JulianToGregorian(DateNum,Year,Month,day);
  Epoch:=Abs(Epoch Mod 86400);
  Hour:=Epoch Div 3600;
  Epoch:=Epoch Mod 3600;
  Minute:=Epoch Div 60;
  Second:=Epoch Mod 60;
End;


function GetTickCount64: QWord;
var
  tp: TTimeVal;
begin
  fpgettimeofday(@tp, nil);
  Result := (Int64(tp.tv_sec) * 1000) + (tp.tv_usec div 1000);
end;



{****************************************************************************
                              File Functions
****************************************************************************}



Procedure FSplit(const Path:PathStr;Var Dir:DirStr;Var Name:NameStr;Var Ext:ExtStr);
Var
  DotPos,SlashPos,i : longint;
Begin
  SlashPos:=0;
  DotPos:=256;
  i:=Length(Path);
  While (i>0) and (SlashPos=0) Do
   Begin
     If (DotPos=256) and (Path[i]='.') Then
      begin
        DotPos:=i;
      end;
     If (Path[i]='/') Then
      SlashPos:=i;
     Dec(i);
   End;
  Ext:=Copy(Path,DotPos,255);
  Dir:=Copy(Path,1,SlashPos);
  Name:=Copy(Path,SlashPos + 1,DotPos - SlashPos - 1);
End;


Function DoFileLocking(Handle: Longint; Mode: Integer) : Longint;
var
  lockop: cint;
  lockres: cint;
  closeres: cint;
  lockerr: cint;
begin
  DoFileLocking:=Handle;
{$ifdef beos}
{$else}
  if (Handle>=0) then
    begin
{$if defined(solaris) or defined(aix)}
      { Solaris' & AIX' flock is based on top of fcntl, which does not allow
        exclusive locks for files only opened for reading nor shared locks
        for files opened only for writing.
        
        If no locking is specified, we normally need an exclusive lock.
        So create an exclusive lock for fmOpenWrite and fmOpenReadWrite,
        but only a shared lock for fmOpenRead (since an exclusive lock
        is not possible in that case)
      }
      if ((mode and (fmShareCompat or fmShareExclusive or fmShareDenyWrite or fmShareDenyRead or fmShareDenyNone)) = 0) then
        begin
          if ((mode and (fmOpenRead or fmOpenWrite or fmOpenReadWrite)) = fmOpenRead) then
            mode := mode or fmShareDenyWrite
          else
            mode := mode or fmShareExclusive;
        end;
{$endif solaris}
      case (mode and (fmShareCompat or fmShareExclusive or fmShareDenyWrite or fmShareDenyRead or fmShareDenyNone)) of
        fmShareCompat,
        fmShareExclusive:
          lockop:=LOCK_EX or LOCK_NB;
        fmShareDenyWrite:
          lockop:=LOCK_SH or LOCK_NB;
        fmShareDenyNone:
          exit;
        else
          begin
            { fmShareDenyRead does not exit under *nix, only shared access
              (similar to fmShareDenyWrite) and exclusive access (same as
              fmShareExclusive)
            }
            repeat
              closeres:=FpClose(Handle);
            until (closeres<>-1) or (fpgeterrno<>ESysEINTR);
            DoFileLocking:=-1;
            exit;
          end;
      end;
      repeat
        lockres:=fpflock(Handle,lockop);
      until (lockres=0) or
            (fpgeterrno<>ESysEIntr);
      lockerr:=fpgeterrno;
      { Only return an error if locks are working and the file was already
        locked. Not if locks are simply unsupported (e.g., on Angstrom Linux
        you always get ESysNOLCK in the default configuration) }
      if (lockres<>0) and
         ((lockerr=ESysEAGAIN) or
          (lockerr=EsysEDEADLK)) then
        begin
          repeat
            closeres:=FpClose(Handle);
          until (closeres<>-1) or (fpgeterrno<>ESysEINTR);
          DoFileLocking:=-1;
          exit;
        end;
    end;
{$endif not beos}
end;


Function FileOpen (Const FileName : string; Mode : Integer) : Longint;

Var
  LinuxFlags : longint;
begin
  LinuxFlags:=0;
  case (Mode and (fmOpenRead or fmOpenWrite or fmOpenReadWrite)) of
    fmOpenRead : LinuxFlags:=LinuxFlags or O_RdOnly;
    fmOpenWrite : LinuxFlags:=LinuxFlags or O_WrOnly;
    fmOpenReadWrite : LinuxFlags:=LinuxFlags or O_RdWr;
  end;

  repeat
    FileOpen:=fpOpen (pointer(FileName),LinuxFlags);
  until (FileOpen<>-1) or (fpgeterrno<>ESysEINTR);

  FileOpen:=DoFileLocking(FileOpen, Mode);
end;


Function FileCreate (Const FileName : String) : Longint;

begin
  repeat
    FileCreate:=fpOpen(pointer(FileName),O_RdWr or O_Creat or O_Trunc);
  until (FileCreate<>-1) or (fpgeterrno<>ESysEINTR);
end;


Function FileCreate (Const FileName : String;Rights : Longint) : Longint;

begin
  repeat
    FileCreate:=fpOpen(pointer(FileName),O_RdWr or O_Creat or O_Trunc,Rights);
  until (FileCreate<>-1) or (fpgeterrno<>ESysEINTR);
end;

Function FileCreate (Const FileName : String; ShareMode : Longint; Rights:LongInt ) : Longint;

begin
  Result:=FileCreate( FileName, Rights );
  Result:=DoFileLocking(Result,ShareMode);
end;


Function FileRead (Handle : Longint; out Buffer; Count : longint) : Longint;

begin
  repeat
    FileRead:=fpRead (Handle,Buffer,Count);
  until (FileRead<>-1) or (fpgeterrno<>ESysEINTR);
end;


Function FileWrite (Handle : Longint; const Buffer; Count : Longint) : Longint;

begin
  repeat
    FileWrite:=fpWrite (Handle,Buffer,Count);
  until (FileWrite<>-1) or (fpgeterrno<>ESysEINTR);
end;


Function FileSeek (Handle,FOffset,Origin : Longint) : Longint;

begin
  result:=longint(FileSeek(Handle,int64(FOffset),Origin));
end;


Function FileSeek (Handle : Longint; FOffset : Int64; Origin : Longint) : Int64;
begin
  FileSeek:=fplSeek (Handle,FOffset,Origin);
end;


Procedure FileClose (Handle : Longint);
var
  res: cint;
begin
  repeat
    res:=fpclose(Handle);
  until (res<>-1) or (fpgeterrno<>ESysEINTR);
end;

Function FileTruncate (Handle: THandle; Size: Int64) : boolean;
var
  res: cint;
begin
  if (SizeOf (TOff) < 8)   (* fpFTruncate only supporting signed 32-bit size *)
     and (Size > high (longint)) then
    FileTruncate := false
  else
    begin
      repeat
        res:=fpftruncate(Handle,Size);
      until (res<>-1) or (fpgeterrno<>ESysEINTR);
      FileTruncate:=res>=0;
    end;
end;


Function FileAge (Const FileName : String): Longint;

Var Info : Stat;

begin
  If  (fpstat (pointer(FileName),Info)<0) or fpS_ISDIR(info.st_mode) then
    exit(-1)
  else 
    Result:=info.st_mtime;
end;


Function FileExists (Const FileName : String) : Boolean;

begin
  // Don't use stat. It fails on files >2 GB.
  // Access obeys the same access rules, so the result should be the same.
  FileExists:=fpAccess(pointer(filename),F_OK)=0;
end;


Function DirectoryExists (Const Directory : String) : Boolean;

Var Info : Stat;

begin
  DirectoryExists:=(fpstat(pointer(Directory),Info)>=0) and fpS_ISDIR(Info.st_mode);
end;


Function LinuxToWinAttr (const FN : Ansistring; Const Info : Stat) : Longint;

Var
  LinkInfo : Stat;
  nm : AnsiString;
begin
  Result:=faArchive;
  If fpS_ISDIR(Info.st_mode) then
    Result:=Result or faDirectory;
  nm:=ExtractFileName(FN);
  If (Length(nm)>=2) and
     (nm[1]='.') and
     (nm[2]<>'.')  then
    Result:=Result or faHidden;
  If (Info.st_Mode and S_IWUSR)=0 Then
     Result:=Result or faReadOnly;
  If fpS_ISSOCK(Info.st_mode) or fpS_ISBLK(Info.st_mode) or fpS_ISCHR(Info.st_mode) or fpS_ISFIFO(Info.st_mode) Then
     Result:=Result or faSysFile;
  If fpS_ISLNK(Info.st_mode) Then
    begin
    Result:=Result or faSymLink;
    // Windows reports if the link points to a directory.
    if (fpstat(FN,LinkInfo)>=0) and fpS_ISDIR(LinkInfo.st_mode) then
      Result := Result or faDirectory;
    end;
end;


Function FNMatch(const Pattern,Name:string):Boolean;
Var
  LenPat,LenName : longint;

  Function DoFNMatch(i,j:longint):Boolean;
  Var
    Found : boolean;
  Begin
  Found:=true;
  While Found and (i<=LenPat) Do
   Begin
     Case Pattern[i] of
      '?' : Found:=(j<=LenName);
      '*' : Begin
            {find the next character in pattern, different of ? and *}
              while Found do
                begin
                inc(i);
                if i>LenPat then Break;
                case Pattern[i] of
                  '*' : ;
                  '?' : begin
                          if j>LenName then begin DoFNMatch:=false; Exit; end;
                          inc(j);
                        end;
                else
                  Found:=false;
                end;
               end;
              Assert((i>LenPat) or ( (Pattern[i]<>'*') and (Pattern[i]<>'?') ));
            {Now, find in name the character which i points to, if the * or ?
             wasn't the last character in the pattern, else, use up all the
             chars in name}
              Found:=false;
              if (i<=LenPat) then
              begin
                repeat
                  {find a letter (not only first !) which maches pattern[i]}
                  while (j<=LenName) and (name[j]<>pattern[i]) do
                    inc (j);
                  if (j<LenName) then
                  begin
                    if DoFnMatch(i+1,j+1) then
                    begin
                      i:=LenPat;
                      j:=LenName;{we can stop}
                      Found:=true;
                      Break;
                    end else
                      inc(j);{We didn't find one, need to look further}
                  end else
                  if j=LenName then
                  begin
                    Found:=true;
                    Break;
                  end;
                  { This 'until' condition must be j>LenName, not j>=LenName.
                    That's because when we 'need to look further' and
                    j = LenName then loop must not terminate. }
                until (j>LenName);
              end else
              begin
                j:=LenName;{we can stop}
                Found:=true;
              end;
            end;
     else {not a wildcard character in pattern}
       Found:=(j<=LenName) and (pattern[i]=name[j]);
     end;
     inc(i);
     inc(j);
   end;
  DoFnMatch:=Found and (j>LenName);
  end;

Begin {start FNMatch}
  LenPat:=Length(Pattern);
  LenName:=Length(Name);
  FNMatch:=DoFNMatch(1,1);
End;


Type
  TUnixFindData = Record
    NamePos    : LongInt;     {to track which search this is}
    DirPtr     : Pointer;     {directory pointer for reading directory}
    SearchSpec : String;
    SearchType : Byte;        {0=normal, 1=open will close, 2=only 1 file}
    SearchAttr : Byte;        {attribute we are searching for}
  End;
  PUnixFindData = ^TUnixFindData;

Procedure FindClose(Var f: TSearchRec);
var
  UnixFindData : PUnixFindData;
Begin
  UnixFindData:=PUnixFindData(f.FindHandle);
  If (UnixFindData=Nil) then
    Exit;
  if UnixFindData^.SearchType=0 then
    begin
      if UnixFindData^.dirptr<>nil then
        fpclosedir(pdir(UnixFindData^.dirptr)^);
    end;
  Dispose(UnixFindData);
  f.FindHandle:=nil;
End;


Function FindGetFileInfo(const s:string;var f:TSearchRec):boolean;
var
  st           : baseunix.stat;
  WinAttr      : longint;

begin
  FindGetFileInfo:=false;
  If Assigned(F.FindHandle) and ((((PUnixFindData(f.FindHandle)^.searchattr)) and faSymlink) > 0) then
    FindGetFileInfo:=(fplstat(pointer(s),st)=0)
  else
    FindGetFileInfo:=(fpstat(pointer(s),st)=0);
  If not FindGetFileInfo then
    exit;
  WinAttr:=LinuxToWinAttr(s,st);
  If ((WinAttr and Not(PUnixFindData(f.FindHandle)^.searchattr))=0) Then
   Begin
     f.Name:=ExtractFileName(s);
     f.Attr:=WinAttr;
     f.Size:=st.st_Size;
     f.Mode:=st.st_mode;
     f.Time:=st.st_mtime;
     FindGetFileInfo:=true;
   End
  else
    FindGetFileInfo:=false;
end;


Function FindNext (Var Rslt : TSearchRec) : Longint;
{
  re-opens dir if not already in array and calls FindGetFileInfo
}
Var
  DirName  : String;
  FName,
  SName    : string;
  Found,
  Finished : boolean;
  p        : pdirent;
  UnixFindData : PUnixFindData;
Begin
  Result:=-1;
  UnixFindData:=PUnixFindData(Rslt.FindHandle);
  { SearchSpec='' means that there were no wild cards, so only one file to
    find.
  }
  If (UnixFindData=Nil) then 
    exit;
  if UnixFindData^.SearchSpec='' then
    exit;
  if (UnixFindData^.SearchType=0) and
     (UnixFindData^.Dirptr=nil) then
    begin
      If UnixFindData^.NamePos = 0 Then
        DirName:='./'
      Else
        DirName:=Copy(UnixFindData^.SearchSpec,1,UnixFindData^.NamePos);
      UnixFindData^.DirPtr := fpopendir(Pchar(pointer(DirName)));
    end;
  SName:=Copy(UnixFindData^.SearchSpec,UnixFindData^.NamePos+1,Length(UnixFindData^.SearchSpec));
  Found:=False;
  Finished:=(UnixFindData^.dirptr=nil);
  While Not Finished Do
   Begin
     p:=fpreaddir(pdir(UnixFindData^.dirptr)^);
     if p=nil then
      FName:=''
     else
      FName:=p^.d_name;
     If FName='' Then
      Finished:=True
     Else
      Begin
        If FNMatch(SName,FName) Then
         Begin
           Found:=FindGetFileInfo(Copy(UnixFindData^.SearchSpec,1,UnixFindData^.NamePos)+FName,Rslt);
           if Found then
             begin
               Result:=0;
               exit;
             end;
         End;
      End;
   End;
End;


Function FindFirst (Const Path : String; Attr : Longint; out Rslt : TSearchRec) : Longint;
{
  opens dir and calls FindNext if needed.
}
var
  UnixFindData : PUnixFindData;
Begin
  Result:=-1;
  fillchar(Rslt,sizeof(Rslt),0);
  if Path='' then
    exit;
  { Allocate UnixFindData (we always need it, for the search attributes) }
  New(UnixFindData);
  FillChar(UnixFindData^,sizeof(UnixFindData^),0);
  Rslt.FindHandle:=UnixFindData;
   {We always also search for readonly and archive, regardless of Attr:}
  UnixFindData^.SearchAttr := Attr or faarchive or fareadonly;
  {Wildcards?}
  if (Pos('?',Path)=0)  and (Pos('*',Path)=0) then
    begin
    if FindGetFileInfo(Path,Rslt) then
      Result:=0;
    end
  else
    begin
    {Create Info}
    UnixFindData^.SearchSpec := Path;
    UnixFindData^.NamePos := Length(UnixFindData^.SearchSpec);
    while (UnixFindData^.NamePos>0) and (UnixFindData^.SearchSpec[UnixFindData^.NamePos]<>'/') do
      dec(UnixFindData^.NamePos);
    Result:=FindNext(Rslt);
    end;
  If (Result<>0) then
    FindClose(Rslt); 
End;


Function FileGetDate (Handle : Longint) : Longint;

Var Info : Stat;

begin
  If (fpFStat(Handle,Info))<0 then
    Result:=-1
  else
    Result:=Info.st_Mtime;
end;


Function FileSetDate (Handle,Age : Longint) : Longint;

begin
  // Impossible under Linux from FileHandle !!
  FileSetDate:=-1;
end;


Function FileGetAttr (Const FileName : String) : Longint;

Var Info : Stat;
  res : Integer;
begin
  res:=FpLStat (pointer(FileName),Info);
  if res<0 then
    res:=FpStat (pointer(FileName),Info);
  if res<0 then
    Result:=-1
  Else
    Result:=LinuxToWinAttr(Pchar(FileName),Info);
end;


Function FileSetAttr (Const Filename : String; Attr: longint) : Longint;

begin
  Result:=-1;
end;


Function DeleteFile (Const FileName : String) : Boolean;

begin
  Result:=fpUnLink (pointer(FileName))>=0;
end;


Function RenameFile (Const OldName, NewName : String) : Boolean;

begin
  RenameFile:=BaseUnix.FpRename(pointer(OldNAme),pointer(NewName))>=0;
end;

Function FileIsReadOnly(const FileName: String): Boolean;

begin
  Result := fpAccess(PChar(pointer(FileName)),W_OK)<>0;
end;

Function FileSetDate (Const FileName : String;Age : Longint) : Longint;

var
  t: TUTimBuf;

begin
  Result := 0;
  t.actime := Age;
  t.modtime := Age;
  if fputime(PChar(pointer(FileName)), @t) = -1 then
    Result := fpgeterrno;
end;

{****************************************************************************
                              Disk Functions
****************************************************************************}

{
  The Diskfree and Disksize functions need a file on the specified drive, since this
  is required for the fpstatfs system call.
  These filenames are set in drivestr[0..26], and have been preset to :
   0 - '.'      (default drive - hence current dir is ok.)
   1 - '/fd0/.'  (floppy drive 1 - should be adapted to local system )
   2 - '/fd1/.'  (floppy drive 2 - should be adapted to local system )
   3 - '/'       (C: equivalent of dos is the root partition)
   4..26          (can be set by you're own applications)
  ! Use AddDisk() to Add new drives !
  They both return -1 when a failure occurs.
}
Const
  FixDriveStr : array[0..3] of pchar=(
    '.',
    '/fd0/.',
    '/fd1/.',
    '/.'
    );
var
  Drives   : byte = 4;
  DriveStr : array[4..26] of pchar;

Function AddDisk(const path:string) : Byte;
begin
  if not (DriveStr[Drives]=nil) then
   FreeMem(DriveStr[Drives]);
  GetMem(DriveStr[Drives],length(Path)+1);
  StrPCopy(DriveStr[Drives],path);
  Result:=Drives;
  inc(Drives);
  if Drives>26 then
   Drives:=4;
end;


Function DiskFree(Drive: Byte): int64;
var
  fs : tstatfs;
Begin
  if ((Drive in [Low(FixDriveStr)..High(FixDriveStr)]) and (not (fixdrivestr[Drive]=nil)) and (fpstatfs(StrPas(fixdrivestr[drive]),@fs)<>-1)) or
     ((Drive <= High(drivestr)) and (not (drivestr[Drive]=nil)) and (fpstatfs(StrPas(drivestr[drive]),@fs)<>-1)) then
   Diskfree:=int64(fs.bavail)*int64(fs.bsize)
  else
   Diskfree:=-1;
End;



Function DiskSize(Drive: Byte): int64;
var
  fs : tstatfs;
Begin
  if ((Drive in [Low(FixDriveStr)..High(FixDriveStr)]) and (not (fixdrivestr[Drive]=nil)) and (fpstatfs(StrPas(fixdrivestr[drive]),@fs)<>-1)) or
     ((drive <= High(drivestr)) and (not (drivestr[Drive]=nil)) and (fpstatfs(StrPas(drivestr[drive]),@fs)<>-1)) then
   DiskSize:=int64(fs.blocks)*int64(fs.bsize)
  else
   DiskSize:=-1;
End;


Procedure FreeDriveStr;
var
  i: longint;
begin
  for i:=low(drivestr) to high(drivestr) do
    if assigned(drivestr[i]) then
      begin
        freemem(drivestr[i]);
        drivestr[i]:=nil;
      end;
end;



Function GetCurrentDir : String;
begin
  GetDir (0,Result);
end;


Function SetCurrentDir (Const NewDir : String) : Boolean;
begin
  {$I-}
   ChDir(NewDir);
  {$I+}
  result := (IOResult = 0);
end;


Function CreateDir (Const NewDir : String) : Boolean;
begin
  {$I-}
   MkDir(NewDir);
  {$I+}
  result := (IOResult = 0);
end;


Function RemoveDir (Const Dir : String) : Boolean;
begin
  {$I-}
   RmDir(Dir);
  {$I+}
  result := (IOResult = 0);
end;


{****************************************************************************
                              Misc Functions
****************************************************************************}



{****************************************************************************
                              Locale Functions
****************************************************************************}


Function GetEpochTime: cint;
{
  Get the number of seconds since 00:00, January 1 1970, GMT
  the time NOT corrected any way
}
begin
  GetEpochTime:=fptime;
end;

// Now, adjusted to local time.

Procedure DoGetLocalDateTime(var year, month, day, hour, min,  sec, msec, usec : word);

var
  tz:timeval;
begin
  fpgettimeofday(@tz,nil);
  EpochToLocal(tz.tv_sec,year,month,day,hour,min,sec);
  msec:=tz.tv_usec div 1000;
  usec:=tz.tv_usec mod 1000;
end;

procedure GetTime(var hour,min,sec,msec,usec:word);

Var
  year,day,month:Word;

begin
  DoGetLocalDateTime(year,month,day,hour,min,sec,msec,usec);
end;

procedure GetTime(var hour,min,sec,sec100:word);
{
  Gets the current time, adjusted to local time
}
var
  year,day,month,usec : word;
begin
  DoGetLocalDateTime(year,month,day,hour,min,sec,sec100,usec);
  sec100:=sec100 div 10;
end;

Procedure GetTime(Var Hour,Min,Sec:Word);
{
  Gets the current time, adjusted to local time
}
var
  year,day,month,msec,usec : Word;
Begin
  DoGetLocalDateTime(year,month,day,hour,min,sec,msec,usec);
End;

Procedure GetDate(Var Year,Month,Day:Word);
{
  Gets the current date, adjusted to local time
}
var
  hour,minute,second,msec,usec : word;
Begin
  DoGetLocalDateTime(year,month,day,hour,minute,second,msec,usec);
End;

Procedure GetDateTime(Var Year,Month,Day,hour,minute,second:Word);
{
  Gets the current date, adjusted to local time
}
Var
  usec,msec : word;
  
Begin
  DoGetLocalDateTime(year,month,day,hour,minute,second,msec,usec);
End;




{$ifndef FPUNONE}
Procedure GetLocalTime(var SystemTime: TSystemTime);

var
  usecs : Word;
begin
  DoGetLocalDateTime(SystemTime.Year, SystemTime.Month, SystemTime.Day,SystemTime.Hour, SystemTime.Minute, SystemTime.Second, SystemTime.MilliSecond, usecs);
end ;
{$endif}


Procedure InitAnsi;
Var
  i : longint;
begin
  {  Fill table entries 0 to 127  }
  for i := 0 to 96 do
    UpperCaseTable[i] := chr(i);
  for i := 97 to 122 do
    UpperCaseTable[i] := chr(i - 32);
  for i := 123 to 191 do
    UpperCaseTable[i] := chr(i);
  Move (CPISO88591UCT,UpperCaseTable[192],SizeOf(CPISO88591UCT));

  for i := 0 to 64 do
    LowerCaseTable[i] := chr(i);
  for i := 65 to 90 do
    LowerCaseTable[i] := chr(i + 32);
  for i := 91 to 191 do
    LowerCaseTable[i] := chr(i);
  Move (CPISO88591LCT,LowerCaseTable[192],SizeOf(CPISO88591UCT));
end;


Procedure InitInternational;
begin
  InitInternationalGeneric;
  InitAnsi;
end;

function SysErrorMessage(ErrorCode: Integer): String;

begin
  Result:=StrError(ErrorCode);
end;

{****************************************************************************
                              OS utility functions
****************************************************************************}

Function GetEnvironmentVariable(Const EnvVar : String) : String;

begin
  Result:=StrPas(BaseUnix.FPGetenv(PChar(pointer(EnvVar))));
end;

Function GetEnvironmentVariableCount : Integer;

begin
  Result:=FPCCountEnvVar(EnvP);
end;

Function GetEnvironmentString(Index : Integer) : String;

begin
  Result:=FPCGetEnvStrFromP(Envp,Index);
end;


function ExecuteProcess(Const Path: AnsiString; Const ComLine: AnsiString;Flags:TExecuteFlags=[]):integer;
var
  pid    : longint;
  e      : EOSError;
  CommandLine: AnsiString;
  cmdline2 : ppchar;

Begin
  { always surround the name of the application by quotes
    so that long filenames will always be accepted. But don't
    do it if there are already double quotes!
  }

   // Only place we still parse
   cmdline2:=nil;
   if Comline<>'' Then
     begin
       CommandLine:=ComLine;
       { Make an unique copy because stringtoppchar modifies the
         string }
       UniqueString(CommandLine);
       cmdline2:=StringtoPPChar(CommandLine,1);
       cmdline2^:=pchar(pointer(Path));
     end
   else
     begin
       getmem(cmdline2,2*sizeof(pchar));
       cmdline2^:=pchar(Path);
       cmdline2[1]:=nil;
     end;

  {$ifdef USE_VFORK}
  pid:=fpvFork;
  {$else USE_VFORK}
  pid:=fpFork;
  {$endif USE_VFORK}
  if pid=0 then
   begin
   {The child does the actual exec, and then exits}
      fpexecv(pchar(pointer(Path)),Cmdline2);
     { If the execve fails, we return an exitvalue of 127, to let it be known}
     fpExit(127);
   end
  else
   if pid=-1 then         {Fork failed}
    begin
      e:=EOSError.CreateFmt(SExecuteProcessFailed,[Path,-1]);
      e.ErrorCode:=-1;
      raise e;
    end;

  { We're in the parent, let's wait. }
  result:=WaitProcess(pid); // WaitPid and result-convert

  if Comline<>'' Then
    freemem(cmdline2);

  if (result<0) or (result=127) then
    begin
    E:=EOSError.CreateFmt(SExecuteProcessFailed,[Path,result]);
    E.ErrorCode:=result;
    Raise E;
    end;
End;

function ExecuteProcess(Const Path: AnsiString; Const ComLine: Array Of AnsiString;Flags:TExecuteFlags=[]):integer;

var
  pid    : longint;
  e : EOSError;

Begin
  pid:=fpFork;
  if pid=0 then
   begin
     {The child does the actual exec, and then exits}
      fpexecl(Path,Comline);
     { If the execve fails, we return an exitvalue of 127, to let it be known}
     fpExit(127);
   end
  else
   if pid=-1 then         {Fork failed}
    begin
      e:=EOSError.CreateFmt(SExecuteProcessFailed,[Path,-1]);
      e.ErrorCode:=-1;
      raise e;
    end;

  { We're in the parent, let's wait. }
  result:=WaitProcess(pid); // WaitPid and result-convert

  if (result<0) or (result=127) then
    begin
    E:=EOSError.CreateFmt(SExecuteProcessFailed,[Path,result]);
    E.ErrorCode:=result;
    raise E;
    end;
End;


procedure Sleep(milliseconds: Cardinal);

Var
  timeout,timeoutresult : TTimespec;
  res: cint;
begin
  timeout.tv_sec:=milliseconds div 1000;
  timeout.tv_nsec:=1000*1000*(milliseconds mod 1000);
  repeat
    res:=fpnanosleep(@timeout,@timeoutresult);
    timeout:=timeoutresult;
  until (res<>-1) or (fpgeterrno<>ESysEINTR);
end;

Function GetLastOSError : Integer;

begin
  Result:=fpgetErrNo;
end;



{ ---------------------------------------------------------------------
    Application config files
  ---------------------------------------------------------------------}


Function GetHomeDir : String;

begin
  Result:=GetEnvironmentVariable('HOME');
  If (Result<>'') then
    Result:=IncludeTrailingPathDelimiter(Result);
end;

{ Follows base-dir spec,
  see [http://freedesktop.org/Standards/basedir-spec].
  Always ends with PathDelim. }
Function XdgConfigHome : String;
begin
  Result:=GetEnvironmentVariable('XDG_CONFIG_HOME');
  if (Result='') then
    Result:=GetHomeDir + '.config/'
  else
    Result:=IncludeTrailingPathDelimiter(Result);
end;

Function GetAppConfigDir(Global : Boolean) : String;

begin
  If Global then
    Result:=IncludeTrailingPathDelimiter(SysConfigDir)
  else
    Result:=IncludeTrailingPathDelimiter(XdgConfigHome);
  if VendorName<>'' then
    Result:=IncludeTrailingPathDelimiter(Result+VendorName);
  Result:=IncludeTrailingPathDelimiter(Result+ApplicationName);
end;

Function GetAppConfigFile(Global : Boolean; SubDir : Boolean) : String;

begin
  If Global then
    Result:=IncludeTrailingPathDelimiter(SysConfigDir)
  else
    Result:=IncludeTrailingPathDelimiter(XdgConfigHome);
  if SubDir then
    begin
      if VendorName<>'' then
        Result:=IncludeTrailingPathDelimiter(Result+VendorName);
      Result:=IncludeTrailingPathDelimiter(Result+ApplicationName);
    end;
  Result:=Result+ApplicationName+ConfigExtension;
end;


{****************************************************************************
                              GetTempDir 
****************************************************************************}


Function GetTempDir(Global : Boolean) : String;

begin
  If Assigned(OnGetTempDir) then
    Result:=OnGetTempDir(Global)
  else
    begin
    Result:=GetEnvironmentVariable('TEMP');
    If (Result='') Then
      Result:=GetEnvironmentVariable('TMP');
    If (Result='') Then
      Result:=GetEnvironmentVariable('TMPDIR');
    if (Result='') then
      Result:='/tmp/' // fallback.
    end;
  if (Result<>'') then
    Result:=IncludeTrailingPathDelimiter(Result);
end;

{****************************************************************************
                              GetUserDir 
****************************************************************************}

Var
  TheUserDir : String;

Function GetUserDir : String;

begin
  If (TheUserDir='') then
    begin
    TheUserDir:=GetEnvironmentVariable('HOME'); 
    if (TheUserDir<>'') then
      TheUserDir:=IncludeTrailingPathDelimiter(TheUserDir)
    else
      TheUserDir:=GetTempDir(False);
    end;
  Result:=TheUserDir;    
end;

Procedure SysBeep;

begin
  Write(#7);
  Flush(Output);
end;

function GetLocalTimeOffset: Integer;

begin
 Result := -Tzseconds div 60; 
end;

{****************************************************************************
                              Initialization code
****************************************************************************}

Initialization
  InitExceptions;       { Initialize exceptions. OS independent }
  InitInternational;    { Initialize internationalization settings }
  SysConfigDir:='/etc'; { Initialize system config dir }
  OnBeep:=@SysBeep;
  
Finalization
  FreeDriveStr;
  DoneExceptions;
end.