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program TestSignals;

{$APPTYPE CONSOLE}

uses
  Libc;

var
  bTerminate: Boolean;

procedure SignalProc(SigNum: Integer); cdecl;
begin
  case SigNum of
    SIGQUIT:
      begin
        WriteLn('signal SIGQUIT');
        bTerminate := true;
      end;
    SIGUSR1: WriteLn('signal SIGUSR1');
  else
    WriteLn('not handled signal');
  end;
  signal(SigNum, SignalProc); // catch the signal again
end;

begin
  bTerminate := false;

  signal(SIGQUIT, SignalProc);
    // catch the signal SIGQUIT to procedure SignalProc
  signal(SIGUSR1, SignalProc);
    // catch the signal SIGUSR1 to procedure SignalProc

  repeat
    sleep(1);
  until bTerminate;
end.