Trap ctrl-c
lazarus / 32-Linux

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Noobie · 2020-03-21 09:48

How do I catch ctrl-c event in Linux console application?
If user kill the app by ctrl-c program not closing properly.
Thanks!

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PascalDragon · 2020-03-21 10:14

You need to use either fpSignal or fpSigAction. Here is an example
with fpSignal:

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tctrlc; uses  BaseUnix; procedure HandleSigInt(aSignal: LongInt);
cdecl;begin  Writeln('Ctrl + C used');  Halt(1);end; begin  if
FpSignal(SigInt, @HandleSigInt) = signalhandler(SIG_ERR) then begin  
Writeln('Failed to install signal error: ', fpGetErrno);    Halt(1); 
end;   Writeln('Use Ctrl + C or press ENTER to exit');  Readln; 
Writeln('Enter used');end.
You might also want to look at C-based example to learn how to handle
signals correctly.