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{
Copyright (c) 1997-98 by Michael Van Canneyt
Unit to catch segmentation faults and Ctrl-C and exit gracefully
under linux and go32v2
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 fpcatch;
interface
{$i globdir.inc}
{$ifdef Unix}
uses
baseunix,
unix;
{$endif}
{$ifdef go32v2}
uses
dpmiexcp;
{$endif}
{$ifdef Windows}
uses
windows
{$ifdef HasSignal}
,signals
{$endif}
;
{$endif}
{$ifdef HasSignal}
Var
NewSignal,OldSigSegm,OldSigILL,
OldSigInt,OldSigFPE : SignalHandler;
{$endif}
Const
CtrlCPressed : Boolean = false;
Procedure EnableCatchSignals;
Procedure DisableCatchSignals;
{$ifdef DEBUG}
procedure Generate_SIGSEGV;
procedure Generate_SIGFPE;
{$endif DEBUG}
var
StopJmp : Jmp_Buf;
const
StopJmpValid : boolean = false;
{$IFNDEF HASSIGNAL}
const
SIGABRT = 288;
SIGFPE = 289;
SIGILL = 290;
SIGSEGV = 291;
SIGTERM = 292;
SIGALRM = 293;
SIGHUP = 294;
SIGINT = 295;
SIGKILL = 296;
SIGPIPE = 297;
SIGQUIT = 298;
SIGUSR1 = 299;
SIGUSR2 = 300;
SIGNOFP = 301;
SIGTRAP = 302;
SIGTIMR = 303; { Internal for setitimer (SIGALRM, SIGPROF) }
SIGPROF = 304;
SIGMAX = 320;
SIG_BLOCK = 1;
SIG_SETMASK = 2;
SIG_UNBLOCK = 3;
{$ENDIF HASSIGNAL}
Implementation
uses
keyboard,
drivers,
FVConsts,
dos,app,msgbox,
FPCompil,FPIDE;
Const
LastCtrlC : longint = 0;
{$ifdef useresstrings}
resourcestring
{$else}
const
{$endif}
msg_quitconfirm = 'Do You really want to quit?';
{$ifdef DEBUG}
procedure Generate_SIGSEGV;
var
l : plongint;
begin
{ Force a SIGSEGV }
l:=pointer (ptrint ($ffffffff));
l^:=1;
end;
procedure Generate_SIGFPE;
var
x,y : real;
begin
{ Force a SIGFPE }
y:=-5;
x:=sqrt(y);
end;
{$endif DEBUG}
{$ifdef HasSignal}
{$ifndef SignalIsFunction}
Procedure Catchsignal(Sig : Longint);cdecl;
{$else SignalIsFunction}
{$ifdef SignalIsCdecl}
Function Catchsignal(Sig : longint):longint; cdecl;
{$else not SignalIsCdecl}
Function Catchsignal(Sig : longint):longint;
{$endif not SignalIsCdecl}
{$endif SignalIsFunction}
var MustQuit: boolean;
begin
case Sig of
SIGSEGV : begin
if StopJmpValid then
LongJmp(StopJmp,SIGSEGV);
if Assigned(Application) then IDEApp.Done;
Writeln('Internal SIGSEGV Error caught');
{$ifndef DEBUG}
Halt;
{$else DEBUG}
RunError(216);
{$endif DEBUG}
end;
SIGFPE : begin
if StopJmpValid then
LongJmp(StopJmp,SIGFPE);
if Assigned(Application) then IDEApp.Done;
Writeln('Internal SIGFPE Error caught');
{$ifndef DEBUG}
Halt;
{$else DEBUG}
RunError(207);
{$endif DEBUG}
end;
SIGILL : begin
if StopJmpValid then
LongJmp(StopJmp,SIGILL);
if Assigned(Application) then IDEApp.Done;
Writeln('Internal SIGILL Error caught');
{$ifndef DEBUG}
Halt;
{$else DEBUG}
RunError(216);
{$endif DEBUG}
end;
SIGINT : begin
if StopJmpValid then
LongJmp(StopJmp,SIGINT);
IF NOT CtrlCPressed and Assigned(Application) then
begin
MustQuit:=false;
if GetDosTicks>LastCtrlC+10 then
begin
CtrlCPressed:=true;
Keyboard.PutKeyEvent((kbCtrl shl 16) or kbCtrlC);
LastCtrlC:=GetDosTicks;
end;
end
else
begin
if Assigned(Application) then
MustQuit:=MessageBox(#3+msg_QuitConfirm,nil,mferror+mfyesbutton+mfnobutton)=cmYes
else
MustQuit:=true;
end;
if MustQuit then
begin
if Assigned(Application) then IDEApp.Done;
{$ifndef DEBUG}
Halt;
{$else DEBUG}
RunError(216);
{$endif DEBUG}
end;
end;
end;
{$ifdef SignalIsFunction}
CatchSignal:=0;
{$endif SignalIsFunction}
end;
{$endif def HasSignal}
Const
CatchSignalsEnabled : boolean = false;
Procedure EnableCatchSignals;
{$ifdef Windows}
var Mode: DWORD;
{$endif Windows}
begin
if CatchSignalsEnabled then
exit;
{$ifdef Windows}
if GetConsoleMode(GetStdHandle(cardinal(Std_Input_Handle)), @Mode) then
begin
{$ifdef DEBUG}
Writeln(stderr,'Starting value of ConsoleMode is $',hexstr(Mode,8));
{$endif DEBUG}
SetConsoleMode(GetStdHandle(cardinal(Std_Input_Handle)),
(Mode or ENABLE_MOUSE_INPUT) and not ENABLE_PROCESSED_INPUT);
{$ifdef DEBUG}
end
else
begin
Writeln(stderr,'Call to GetConsoleMode failed, GetLastError=',
GetLastError);
{$endif DEBUG}
end;
{$endif Windows}
{$ifdef go32v2}
{
I think that it was an error to put that here PM
djgpp_set_ctrl_c(false);
at least since that this is now handled in fpusrscr.pas unit
}
{$endif go32v2}
{$ifdef HasSignal}
NewSignal:=@CatchSignal;
OldSigSegm:={$ifdef unix}fpSignal{$else}Signal{$endif}(SIGSEGV,NewSignal);
OldSigInt:={$ifdef unix}fpSignal{$else}Signal{$endif}(SIGINT,NewSignal);
OldSigFPE:={$ifdef unix}fpSignal{$else}Signal{$endif}(SIGFPE,NewSignal);
OldSigILL:={$ifdef unix}fpSignal{$else}Signal{$endif}(SIGILL,NewSignal);
CatchSignalsEnabled:=true;
{$endif}
end;
Procedure DisableCatchSignals;
begin
{$ifdef HasSignal}
if not CatchSignalsEnabled then
exit;
{$ifdef unix}fpSignal{$else}Signal{$endif}(SIGSEGV,OldSigSegm);
{$ifdef unix}fpSignal{$else}Signal{$endif}(SIGINT,OldSigInt);
{$ifdef unix}fpSignal{$else}Signal{$endif}(SIGFPE,OldSigFPE);
{$ifdef unix}fpSignal{$else}Signal{$endif}(SIGILL,OldSigILL);
CatchSignalsEnabled:=false;
{$endif}
end;
end.
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