3 {signal code by plugwash}
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5 { Copyright (C) 2005 Bas Steendijk and Peter Green
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6 For conditions of distribution and use, see copyright notice in zlib_license.txt
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7 which is included in the package
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8 ----------------------------------------------------------------------------- }
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19 classes,lcore,lloopback;
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22 tsignalevent=procedure(sender:tobject;signal:integer) of object;
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23 tlsignal=class(tcomponent)
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25 onsignal : tsignalevent ;
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26 prevsignal : tlsignal ;
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27 nextsignal : tlsignal ;
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29 constructor create(aowner:tcomponent);override;
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30 destructor destroy;override;
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34 procedure starthandlesignal(signal:integer);
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37 firstsignal : tlsignal;
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39 signalloopback : tlloopback ;
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42 {$include unixstuff.inc}
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44 constructor tlsignal.create;
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46 inherited create(AOwner);
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47 nextsignal := firstsignal;
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50 if assigned(nextsignal) then nextsignal.prevsignal := self;
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51 firstsignal := self;
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55 //released := false;
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58 destructor tlsignal.destroy;
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60 if prevsignal <> nil then begin
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61 prevsignal.nextsignal := nextsignal;
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63 firstsignal := nextsignal;
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65 if nextsignal <> nil then begin
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66 nextsignal.prevsignal := prevsignal;
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72 {$define needsignalworkaround}
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75 {$define needsignalworkaround}
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78 {$define needsignalworkaround}
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81 {$ifdef needsignalworkaround}
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82 //using the 1.9.6 version of this stuff because the 1.9.8 and 2.0.0 versions seem broken
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84 TSysParam = Longint;
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85 TSysResult = longint;
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87 syscall_nr_sigaction = 67;
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88 //function Do_SysCall(sysnr:TSysParam):TSysResult; {$ifndef VER1_0} oldfpccall; {$endif} external name 'FPC_SYSCALL0';
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89 //function Do_SysCall(sysnr,param1:TSysParam):TSysResult; {$ifndef VER1_0} oldfpccall; {$endif} external name 'FPC_SYSCALL1';
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90 //function Do_SysCall(sysnr,param1,param2:TSysParam):TSysResult; {$ifndef VER1_0} oldfpccall; {$endif} external name 'FPC_SYSCALL2';
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91 function Do_SysCall(sysnr,param1,param2,param3:TSysParam):TSysResult; {$ifndef VER1_0} oldfpccall; {$endif} external name 'FPC_SYSCALL3';
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92 //function Do_SysCall(sysnr,param1,param2,param3,param4:TSysParam):TSysResult; {$ifndef VER1_0} oldfpccall; {$endif} external name 'FPC_SYSCALL4';
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93 //function Do_SysCall(sysnr,param1,param2,param3,param4,param5:TSysParam):TSysResult; {$ifndef VER1_0} oldfpccall; {$endif} external name 'FPC_SYSCALL5';
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95 function Fpsigaction(sig: cint; act : psigactionrec; oact : psigactionrec): cint;// [public, alias : 'FPC_SYSC_SIGACTION'];
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97 Change action of process upon receipt of a signal.
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98 Signum specifies the signal (all except SigKill and SigStop).
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99 If Act is non-nil, it is used to specify the new action.
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100 If OldAct is non-nil the previous action is saved there.
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103 //writeln('fucking');
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104 {$ifdef RTSIGACTION}
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106 { Sparc has an extra stub parameter }
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107 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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109 Fpsigaction:=do_syscall(syscall_nr_rt_sigaction,TSysParam(sig),TSysParam(act),TSysParam(oact),TSysParam(8));
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111 {$else RTSIGACTION}
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113 Fpsigaction:=do_syscall(syscall_nr_sigaction,TSysParam(sig),TSysParam(act),TSysParam(oact));
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114 {$endif RTSIGACTION}
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118 // cdecl procedures are not name mangled
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119 // so USING something unlikely to cause colliesions in the global namespace
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121 procedure lsignal_handler( Sig : Integer);cdecl;
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123 currentsignal : tlsignal;
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125 // writeln('in lsignal_hanler');
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126 currentsignal := firstsignal;
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127 while assigned(currentsignal) do begin
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128 if assigned(currentsignal.onsignal) then currentsignal.onsignal(currentsignal,sig);
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129 currentsignal := currentsignal.nextsignal;
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132 // writeln('about to send down signalloopback');
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133 if assigned(signalloopback) then begin
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134 signalloopback.sendstr(' ');
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136 // writeln('left lsignal_hanler');
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141 {$if (FPC_VERSION > 2) or ((FPC_VERSION = 2) and (FPC_RELEASE >= 2))}
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142 procedure lsignal_handler2(signal:longint;info:PSigInfo;context:psigcontext); cdecl;
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144 procedure lsignal_handler2(signal:longint;var info:TSigInfo_t;var context:SigContextRec); cdecl;
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148 lsignal_handler(signal);
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156 saction : sigactionrec = (handler:(sh:lsignal_handler);sa_flags:0);
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159 saction : sigactionrec = (sa_handler:tsigaction(lsignal_handler);sa_flags:0);
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162 //version number is FPC_VERSION.FPC_RELEASE.FPC_PATCH
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163 {$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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164 saction : sigactionrec = (sa_handler:lsignal_handler2;sa_flags:0);
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166 saction : sigactionrec = (sa_handler:tsigaction(lsignal_handler);sa_flags:0);
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171 saction : sigactionrec = (handler:(sh:lsignal_handler);sa_flags:0);
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173 //version number is FPC_VERSION.FPC_RELEASE.FPC_PATCH
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174 {$if (FPC_VERSION>2) or ((FPC_VERSION=2) and (FPC_RELEASE>0)) or ((FPC_VERSION=2) and (fpc_release=0) and (fpc_patch>=2))}
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175 saction : sigactionrec = (sa_handler:{$ifndef ver1_9_6}{$ifndef ver1_9_6}{$ifndef ver1_0}SigActionHandler{$endif}{$endif}{$endif}(lsignal_handler);sa_flags:0;sa_restorer:nil);
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177 saction : sigactionrec = (sa_handler:{$ifndef ver1_9_6}{$ifndef ver1_9_6}{$ifndef ver1_0}SigActionHandler{$endif}{$endif}{$endif}(lsignal_handler));
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183 procedure starthandlesignal(signal:integer);
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185 if signal in ([0..31]-[sigkill,sigstop]) then begin
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186 sigprocmask(SIG_BLOCK,@blockset,nil);
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187 sigaction(signal,@saction,nil)
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189 raise exception.create('invalid signal number')
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194 fillchar(blockset,sizeof(blockset),0);
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195 blockset[0] := $FFFFFFFF - (1 shl sigstop) - (1 shl sigkill) - (1 shl sigsegv);
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196 saction.sa_mask := blockset;
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