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{
$Id: sysutils.pp,v 1.59 2005/03/25 22:53:39 jonas Exp $
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.
**********************************************************************}
Const
KernelUUID = '/proc/sys/kernel/random/uuid';
Procedure GetURandomBytes(Var Buf; NBytes : Integer);
Var
fd,I : Integer;
P : PByte;
begin
P:=@Buf;
fd:=FileOpen('/dev/urandom',fmOpenRead);
if (fd>=0) then
Try
While (NBytes>0) do
begin
I:=FileRead(fd,P^,nbytes);
If I>0 then
begin
Inc(P,I);
Dec(NBytes,I);
end;
end;
Finally
FileClose(Fd);
end
else
GetRandomBytes(Buf,NBytes);
end;
Function CreateKernelGUID(Var GUID : TGUID) : Boolean;
Const
UUIDLen = 36;
Var
fd: Longint;
S : String;
begin
fd:=FileOpen(KernelUUID,fmOpenRead);
Result:=(Fd>=0);
if Result then
try
SetLength(S,UUIDLen);
SetLength(S,FileRead(fd,S[1],UUIDLen));
Result:=(Length(S)=UUIDLen);
If Result then
GUID:=StringToGUID('{'+S+'}');
finally
FileClose(FD);
end;
end;
Function SysCreateGUID(out GUID : TGUID) : Integer;
begin
if not CreateKernelGUID(Guid) then
GetRandomBytes(GUID,SizeOf(Guid));
Result:=0;
end;
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