From: Masschelein Bart <masschel@...>
Date: 2005-07-05T19:58:04+09:00
Subject: Re: Abort a system call


> > When I do in Perl sth like
> >
> > system "$decoder $bitstreamPath $yuvOutputPath";
> >
> > I can interrupt the execution with ctrl-c. The Ruby script does what
> > it is expected to, but I cannot interrupt the program with ctrl-c
> > anymore, and have to wait until the execution is finished.
> 
> Without trying out: maybe you have to explicitely set a 
> signal handler for
> SIGINT that then terminates the child process.  Could be that 
> perl does it
> automatically for you.
> 

With parts of other pieces today on the reflector, I assembled this

--------
pid = Process.fork do
  exec($decoder, $bitstreamPath, $yuvOutputPath)
end

trap "SIGINT", proc{ Process.kill("SIGINT", pid); print "^C was pressed. Process id #{pid}\n"  }

Process.waitpid(pid)
--------

The trap gets executed, meaning that I get the output of the print, during the execution of my program, and the pid matches the one from the process status list. However the first part (Process.kill("SIGINT", pid);) is not executed correctly, or at least does not do what I expected, killing the process. Is there another way to kill a process from Ruby? Or do I need another signal # instead of "SIGINT" there? No clue...

regards,

Bart.