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{lsocket.pas}
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{signal code by plugwash}
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{ Copyright (C) 2005 Bas Steendijk and Peter Green
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For conditions of distribution and use, see copyright notice in zlib_license.txt
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which is included in the package
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----------------------------------------------------------------------------- }
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unit lsignal;
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{$mode delphi}
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interface
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uses sysutils,
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{$ifdef VER1_0}
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linux,
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{$else}
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baseunix,unix,unixutil,
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{$endif}
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classes,lcore,lloopback;
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type
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tsignalevent=procedure(sender:tobject;signal:integer) of object;
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tlsignal=class(tcomponent)
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public
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onsignal : tsignalevent ;
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prevsignal : tlsignal ;
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nextsignal : tlsignal ;
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constructor create(aowner:tcomponent);override;
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destructor destroy;override;
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end;
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procedure starthandlesignal(signal:integer);
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var
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firstsignal : tlsignal;
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blockset : sigset;
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signalloopback : tlloopback ;
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implementation
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{$include unixstuff.inc}
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constructor tlsignal.create;
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begin
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inherited create(AOwner);
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nextsignal := firstsignal;
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prevsignal := nil;
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if assigned(nextsignal) then nextsignal.prevsignal := self;
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firstsignal := self;
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//interval := 1000;
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//enabled := true;
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//released := false;
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end;
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destructor tlsignal.destroy;
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begin
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if prevsignal <> nil then begin
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prevsignal.nextsignal := nextsignal;
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end else begin
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firstsignal := nextsignal;
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end;
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if nextsignal <> nil then begin
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nextsignal.prevsignal := prevsignal;
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end;
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inherited destroy;
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end;
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{$ifdef linux}
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{$ifdef ver1_9_8}
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{$define needsignalworkaround}
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{$endif}
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{$ifdef ver2_0_0}
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{$define needsignalworkaround}
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{$endif}
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{$ifdef ver2_0_2}
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{$define needsignalworkaround}
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{$endif}
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{$endif}
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{$ifdef needsignalworkaround}
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//using the 1.9.6 version of this stuff because the 1.9.8 and 2.0.0 versions seem broken
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type
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TSysParam = Longint;
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TSysResult = longint;
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const
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syscall_nr_sigaction = 67;
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//function Do_SysCall(sysnr:TSysParam):TSysResult; {$ifndef VER1_0} oldfpccall; {$endif} external name 'FPC_SYSCALL0';
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//function Do_SysCall(sysnr,param1:TSysParam):TSysResult; {$ifndef VER1_0} oldfpccall; {$endif} external name 'FPC_SYSCALL1';
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//function Do_SysCall(sysnr,param1,param2:TSysParam):TSysResult; {$ifndef VER1_0} oldfpccall; {$endif} external name 'FPC_SYSCALL2';
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function Do_SysCall(sysnr,param1,param2,param3:TSysParam):TSysResult; {$ifndef VER1_0} oldfpccall; {$endif} external name 'FPC_SYSCALL3';
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//function Do_SysCall(sysnr,param1,param2,param3,param4:TSysParam):TSysResult; {$ifndef VER1_0} oldfpccall; {$endif} external name 'FPC_SYSCALL4';
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//function Do_SysCall(sysnr,param1,param2,param3,param4,param5:TSysParam):TSysResult; {$ifndef VER1_0} oldfpccall; {$endif} external name 'FPC_SYSCALL5';
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function Fpsigaction(sig: cint; act : psigactionrec; oact : psigactionrec): cint;// [public, alias : 'FPC_SYSC_SIGACTION'];
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{
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Change action of process upon receipt of a signal.
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Signum specifies the signal (all except SigKill and SigStop).
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If Act is non-nil, it is used to specify the new action.
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If OldAct is non-nil the previous action is saved there.
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}
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begin
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//writeln('fucking');
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{$ifdef RTSIGACTION}
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{$ifdef cpusparc}
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{ Sparc has an extra stub parameter }
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Fpsigaction:=do_syscall(syscall_nr_rt_sigaction,TSysParam(sig),TSysParam(act),TSysParam(oact),TSysParam(PtrInt(@Fprt_sigreturn_stub)-8),TSysParam(8));
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{$else cpusparc}
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Fpsigaction:=do_syscall(syscall_nr_rt_sigaction,TSysParam(sig),TSysParam(act),TSysParam(oact),TSysParam(8));
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{$endif cpusparc}
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{$else RTSIGACTION}
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//writeln('nice');
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Fpsigaction:=do_syscall(syscall_nr_sigaction,TSysParam(sig),TSysParam(act),TSysParam(oact));
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{$endif RTSIGACTION}
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end;
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{$endif}
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// cdecl procedures are not name mangled
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// so USING something unlikely to cause colliesions in the global namespace
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// is a good idea
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procedure lsignal_handler( Sig : Integer);cdecl;
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var
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currentsignal : tlsignal;
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begin
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// writeln('in lsignal_hanler');
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currentsignal := firstsignal;
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while assigned(currentsignal) do begin
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if assigned(currentsignal.onsignal) then currentsignal.onsignal(currentsignal,sig);
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currentsignal := currentsignal.nextsignal;
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end;
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// writeln('about to send down signalloopback');
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if assigned(signalloopback) then begin
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signalloopback.sendstr(' ');
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end;
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// writeln('left lsignal_hanler');
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end;
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{$ifdef freebsd}
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{$if (FPC_VERSION > 2) or ((FPC_VERSION = 2) and (FPC_RELEASE >= 2))}
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procedure lsignal_handler2(signal:longint;info:PSigInfo;context:psigcontext); cdecl;
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{$else}
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procedure lsignal_handler2(signal:longint;var info:TSigInfo_t;var context:SigContextRec); cdecl;
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{$endif}
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begin
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lsignal_handler(signal);
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end;
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{$endif}
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const
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allbitsset=-1;
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{$ifdef ver1_0}
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saction : sigactionrec = (handler:(sh:lsignal_handler);sa_flags:0);
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{$else}
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{$ifdef darwin}
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saction : sigactionrec = (sa_handler:tsigaction(lsignal_handler);sa_flags:0);
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{$else}
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{$ifdef freebsd}
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//version number is FPC_VERSION.FPC_RELEASE.FPC_PATCH
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{$if (FPC_VERSION>2) or ((FPC_VERSION=2) and (FPC_RELEASE>0)) or ((FPC_VERSION=2) and (fpc_release=0) and (fpc_patch>=2))}
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saction : sigactionrec = (sa_handler:lsignal_handler2;sa_flags:0);
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{$else}
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saction : sigactionrec = (sa_handler:tsigaction(lsignal_handler);sa_flags:0);
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{$endif}
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{$else}
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{$ifdef ver1_9_2}
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saction : sigactionrec = (handler:(sh:lsignal_handler);sa_flags:0);
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{$else}
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//version number is FPC_VERSION.FPC_RELEASE.FPC_PATCH
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{$if (FPC_VERSION>2) or ((FPC_VERSION=2) and (FPC_RELEASE>0)) or ((FPC_VERSION=2) and (fpc_release=0) and (fpc_patch>=2))}
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saction : sigactionrec = (sa_handler:{$ifndef ver1_9_6}{$ifndef ver1_9_4}{$ifndef ver1_0}SigActionHandler{$endif}{$endif}{$endif}(lsignal_handler);sa_flags:0;sa_restorer:nil);
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{$else}
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saction : sigactionrec = (sa_handler:{$ifndef ver1_9_6}{$ifndef ver1_9_4}{$ifndef ver1_0}SigActionHandler{$endif}{$endif}{$endif}(lsignal_handler));
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{$endif}
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{$endif}
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{$endif}
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{$endif}
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{$endif}
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procedure starthandlesignal(signal:integer);
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begin
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if signal in ([0..31]-[sigkill,sigstop]) then begin
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sigprocmask(SIG_BLOCK,@blockset,nil);
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sigaction(signal,@saction,nil)
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end else begin
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raise exception.create('invalid signal number')
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end;
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end;
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initialization
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fillchar(blockset,sizeof(blockset),0);
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blockset[0] := $FFFFFFFF - (1 shl sigstop) - (1 shl sigkill) - (1 shl sigsegv);
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{$ifdef ver1_0} |
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saction.sa_mask := blockset[0]; |
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{$else} |
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saction.sa_mask := blockset;
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{$endif}
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end.
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