fpc/rtl/bsd/system.pp
svenbarth 2d454dc8fa Move DynLibs support to System unit using a manager approach like for Threads, WideStrings, etc.. This is needed so that we can support features like "delayed" and loading of dynamic packages.
Each port that allows the usage of dynamic libraries should call InitSystemDynLibs during initialization of the System unit.
The DynLibs unit has been adjusted to be a forwarder for the functions that now reside in the System unit (for backwards compatiblity just in case). Additionally the unit will register the DynLibsManager if it doesn't reside in the System unit anyway.
Currently only the Windows targets (Win32, Win64 and WinCE) implement the DynLibsManager inside the System unit. For other systems using the LoadLibrary, etc. functions will lead to a run error/exception.
If a port wants to implement its own DynLibsManager then it needs to define DISABLE_NO_DYNLIBS_MANAGER. TLibHandle, NilHandle and optionally TOrdinalEntry (it's set to SizeUInt otherwise) should be defined in sysdlh.inc which needs to be enabled using the define FPC_SYSTEM_HAS_SYSDLH (because there are targets which have FEATURE_DYNLIBS enabled, but don't support them... e.g. powerpc-wii -.-).
The DynLibsManager contains methods for loading a library based on a RawByteString and based on a UnicodeString. BOTH should be implemented, but internally one can forward to the other.
The loading by ordinal *can* be be implemented. If it is set to Nil then the implementation of GetProcAddress(lib,ordinal) will return Nil.

+ new functions SetDynLibsManager and GetDynLibsManager to set and retrieve the current DynLibsManager
* provide interface of DynLibs unit in unit System

git-svn-id: trunk@29613 -
2015-02-03 20:00:00 +00:00

362 lines
8.2 KiB
ObjectPascal

{
This file is part of the Free Pascal run time library.
Copyright (c) 2000 by Marco van de Voort
member of the Free Pascal development team.
System unit for the *BSD's.
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.
**********************************************************************}
{ These things are set in the makefile, }
{ But you can override them here.}
{ If you use an aout system, set the conditional AOUT}
{ $Define AOUT}
Unit System;
Interface
{$define FPC_USE_SIGPROCMASK}
{$define FPC_USE_SIGALTSTACK}
{$ifndef FPC_USE_LIBC}
{$define FPC_USE_SYSCALL}
{$endif}
{$define FPC_IS_SYSTEM}
{$I sysunixh.inc}
{$ifdef Darwin}
var argc:longint;
argv:PPchar;
envp:PPchar;
{$endif}
CONST SIGSTKSZ = 40960;
{$if defined(CPUARM)}
{$define fpc_softfpu_interface}
{$i softfpu.pp}
{$undef fpc_softfpu_interface}
{$endif defined(CPUARM)}
Implementation
{$if defined(CPUARM) or defined(CPUM68K)}
{$define fpc_softfpu_implementation}
{$i softfpu.pp}
{$undef fpc_softfpu_implementation}
{ we get these functions and types from the softfpu code }
{$define FPC_SYSTEM_HAS_float64}
{$define FPC_SYSTEM_HAS_float32}
{$define FPC_SYSTEM_HAS_flag}
{$define FPC_SYSTEM_HAS_extractFloat64Frac0}
{$define FPC_SYSTEM_HAS_extractFloat64Frac1}
{$define FPC_SYSTEM_HAS_extractFloat64Exp}
{$define FPC_SYSTEM_HAS_extractFloat64Sign}
{$define FPC_SYSTEM_HAS_ExtractFloat32Frac}
{$define FPC_SYSTEM_HAS_extractFloat32Exp}
{$define FPC_SYSTEM_HAS_extractFloat32Sign}
{$endif defined(CPUARM) or defined(CPUM68K)}
{$I system.inc}
{$ifdef FPC_HAS_SETSYSNR_INC}
{$I setsysnr.inc}
{$endif FPC_HAS_SETSYSNR_INC}
{*****************************************************************************
Misc. System Dependent Functions
*****************************************************************************}
{$ifdef darwin}
procedure normalexit(status: cint); cdecl; external 'c' name 'exit';
{$endif}
procedure System_exit;
{$ifndef darwin}
begin
Fpexit(cint(ExitCode));
end;
{$else darwin}
begin
{ make sure the libc atexit handlers are called, needed for e.g. profiling }
normalexit(cint(ExitCode));
end;
{$endif darwin}
Function ParamCount: Longint;
Begin
Paramcount:=argc-1
End;
function BackPos(c:char; const s: shortstring): integer;
var
i: integer;
Begin
for i:=length(s) downto 0 do
if s[i] = c then break;
if i=0 then
BackPos := 0
else
BackPos := i;
end;
{ variable where full path and filename and executable is stored }
{ is setup by the startup of the system unit. }
//var
// execpathstr : shortstring;
function paramstr(l: longint) : string;
begin
{ stricly conforming POSIX applications }
{ have the executing filename as argv[0] }
// if l=0 then
// begin
// paramstr := execpathstr;
// end
// else
if (l < argc) then
paramstr:=strpas(argv[l])
else
paramstr:='';
end;
Procedure Randomize;
Begin
randseed:=longint(Fptime(nil));
End;
{*****************************************************************************
System Unit Initialization
*****************************************************************************}
function reenable_signal(sig : longint) : boolean;
var
e,oe : TSigSet;
i,j : byte;
olderrno: cint;
begin
fillchar(e,sizeof(e),#0);
fillchar(oe,sizeof(oe),#0);
{ set is 1 based PM }
dec(sig);
i:=sig mod 32;
j:=sig div 32;
e[j]:=1 shl i;
{ this routine is called from a signal handler, so must not change errno }
olderrno:=geterrno;
fpsigprocmask(SIG_UNBLOCK,@e,@oe);
reenable_signal:=geterrno=0;
seterrno(olderrno);
end;
{$ifdef DEBUG}
{ Declare InstallDefaultSignalHandler as forward to be able
to test aclling fpsigaction again within SignalToRunError
function implemented within sighnd.inc inlcude file }
procedure InstallDefaultSignalHandler(signum: longint; out oldact: SigActionRec); forward;
{$endif}
{$i sighnd.inc}
procedure InstallDefaultSignalHandler(signum: longint; out oldact: SigActionRec); public name '_FPC_INSTALLDEFAULTSIGHANDLER';
var
act: SigActionRec;
begin
{ Initialize the sigaction structure }
{ all flags and information set to zero }
FillChar(act,sizeof(SigActionRec),0);
{ initialize handler }
act.sa_handler:=@SignalToRunError;
{$if defined(darwin) and defined(cpu64)}
act.sa_flags:=SA_SIGINFO or SA_64REGSET;
{$else}
act.sa_flags:=SA_SIGINFO;
{$endif}
FpSigAction(signum,@act,@oldact);
end;
var
oldsigfpe: SigActionRec; public name '_FPC_OLDSIGFPE';
oldsigsegv: SigActionRec; public name '_FPC_OLDSIGSEGV';
oldsigbus: SigActionRec; public name '_FPC_OLDSIGBUS';
oldsigill: SigActionRec; public name '_FPC_OLDSIGILL';
Procedure InstallSignals;
begin
InstallDefaultSignalHandler(SIGFPE,oldsigfpe);
InstallDefaultSignalHandler(SIGSEGV,oldsigsegv);
InstallDefaultSignalHandler(SIGBUS,oldsigbus);
InstallDefaultSignalHandler(SIGILL,oldsigill);
end;
Procedure RestoreOldSignalHandlers;
begin
FpSigAction(SIGFPE,@oldsigfpe,nil);
FpSigAction(SIGSEGV,@oldsigsegv,nil);
FpSigAction(SIGBUS,@oldsigbus,nil);
FpSigAction(SIGILL,@oldsigill,nil);
end;
procedure SetupCmdLine;
var
bufsize,
len,j,
size,i : longint;
found : boolean;
buf : pchar;
procedure AddBuf;
begin
reallocmem(cmdline,size+bufsize);
move(buf^,cmdline[size],bufsize);
inc(size,bufsize);
bufsize:=0;
end;
begin
GetMem(buf,ARG_MAX);
size:=0;
bufsize:=0;
i:=0;
while (i<argc) do
begin
len:=strlen(argv[i]);
if len>ARG_MAX-2 then
len:=ARG_MAX-2;
found:=false;
for j:=1 to len do
if argv[i][j]=' ' then
begin
found:=true;
break;
end;
if bufsize+len>=ARG_MAX-2 then
AddBuf;
if found then
begin
buf[bufsize]:='"';
inc(bufsize);
end;
move(argv[i]^,buf[bufsize],len);
inc(bufsize,len);
if found then
begin
buf[bufsize]:='"';
inc(bufsize);
end;
if i<argc-1 then
buf[bufsize]:=' '
else
buf[bufsize]:=#0;
inc(bufsize);
inc(i);
end;
AddBuf;
FreeMem(buf,ARG_MAX);
end;
procedure SysInitStdIO;
begin
OpenStdIO(Input,fmInput,StdInputHandle);
OpenStdIO(Output,fmOutput,StdOutputHandle);
OpenStdIO(ErrOutput,fmOutput,StdErrorHandle);
OpenStdIO(StdOut,fmOutput,StdOutputHandle);
OpenStdIO(StdErr,fmOutput,StdErrorHandle);
end;
{$ifdef FPC_USE_LIBC}
{ can also be used with other BSD's if they use the system's crtX instead of prtX }
{$ifdef Darwin}
procedure pascalmain;cdecl;external name 'PASCALMAIN';
procedure FPC_SYSTEMMAIN(argcparam: Longint; argvparam: ppchar; envpparam: ppchar); cdecl; [public];
begin
argc:= argcparam;
argv:= argvparam;
envp:= envpparam;
{$ifdef cpui386}
Set8087CW(Default8087CW);
{$endif cpui386}
pascalmain; {run the pascal main program}
end;
{$endif Darwin}
{$endif FPC_USE_LIBC}
function GetProcessID: SizeUInt;
begin
GetProcessID := SizeUInt (fpGetPID);
end;
function CheckInitialStkLen(stklen : SizeUInt) : SizeUInt;
var
stackpointer: ptruint;
begin
stackpointer := (ptruint(sptr) + 4095) and not(4095);
if stklen > stackpointer then
stklen := stackpointer-4096;
result := stklen;
end;
Begin
IsConsole := TRUE;
StackLength := CheckInitialStkLen(InitialStkLen);
StackBottom := Sptr - StackLength;
{$ifdef FPC_HAS_SETSYSNR_INC}
{ This procedure is needed for openbsd system which re-uses
the same syscall numbers depending on OS version }
SetSyscallNumbers;
{$endif FPC_HAS_SETSYSNR_INC}
{ Set up signals handlers (may be needed by init code to test cpu features) }
InstallSignals;
{$if defined(cpui386) or defined(cpuarm)}
fpc_cpucodeinit;
{$endif cpui386}
{ Setup heap }
InitHeap;
SysInitExceptions;
initunicodestringmanager;
{ Setup stdin, stdout and stderr }
SysInitStdIO;
{ Reset IO Error }
InOutRes:=0;
{ Arguments }
SetupCmdLine;
{ threading }
InitSystemThreads;
InitSystemDynLibs;
{ restore original signal handlers in case this is a library }
if IsLibrary then
RestoreOldSignalHandlers;
End.